Pneumatic tire

FIELD: transport.

SUBSTANCE: pneumatic tire 1 having excellent snow-running characteristics while keeping control stability and resistance to uneven wear, including tread 2 containing a pair of longitudinal crown grooves running continuously in longitudinal direction of tire at both sides of tire equator C and having edges, where one edge 3m runs in zigzag fashion, so that L-shaped sections 3s of groove edge are continuously interconnected in tire longitudinal direction, and the other edge 3n runs in corrugated manner so that arc-shaped sections of groove edge 3o having arc-shaped convexity towards groove centre are continuously interconnected in tire longitudinal direction where each section 3s of L-shaped groove edge includes long portion 3c inclined at angle of 1 to 20° relative to longitudinal direction, and short portion 3t with longitudinal length less than this value for long portion 3c and inclined in direction opposite to direction of the mentioned long portion 3c relative to longitudinal direction.

EFFECT: improved characteristics.

17 cl, 1 tbl, 10 dwg

 

The present invention relates to a pneumatic tire with improved running characteristics on snow, while maintaining stability control and resistance to uneven wear.

It is well known that to improve the performance on snow (i.e. performance on a snowy road surface), the main longitudinal grooves passing continuously in the longitudinal direction of the tire, curved form, thereby improving the effect of the shift of the column of snow. For example, in JP-A-2003-072321 described pneumatic tire, comprising a tread with a zigzag Central rib, a pair of Central main grooves located on both sides of the Central rib, i.e. the Central core kanaskat with a zigzag edge, and a pair of shoulder main grooves with a zigzag edge. It is also known that to improve the stability of control on an icy road surface, the blocks form a large number of blades, to thereby increase the regional component.

However, the formation of a large number of sipes or the formation of slats fully open, both ends of which are connected with the main grooves, reduces the rigidity of the blocks and, accordingly, may result in deterioration of the stability control or uneven wear on dry road surfaces.

According to the government, the aim of the present invention is to provide a pneumatic tire capable to demonstrate the improved characteristics of snow, while maintaining stability control and suppression of uneven wear.

This and other objectives of the present invention will become apparent from further description.

Description of the invention

The present invention relates to a pneumatic tire provided on the tread surface by a pair of longitudinal grooves of the crown, each of which has such a shape that one of the edges of the groove passes zigzag, so that the segments of the edges of the grooves having a L-shape (a shape similar to a capital letter L italic font), continuously connected to each other in the longitudinal direction of the tire, and the other edge of the groove is held in such a form that the segments of the edges of the groove having a curved shape convex toward the center of the groove, continuously connected to each other in the longitudinal direction of the tire.

In accordance with the present invention provides a pneumatic tire comprising a tread containing a pair of longitudinal grooves of the crown, passing continuously in the longitudinal direction of the tire on both sides of the equator of the tire and having edges, with one of the edges of each longitudinal grooves of the crown passes zigzag, so that the segments of the edges of the grooves having L-obratno the form continuously connected to each other in the longitudinal direction of the tire, and the other edge of the groove passes wavy way, so that the arcuate segments of the edges of the grooves having an arcuate bulge toward the center of the groove, continuously connected to each other in the longitudinal direction of the bus, where each of the segments of the edges of the grooves in an L-shape includes a long portion at an angle of from 1° to 20 ° relative to the longitudinal direction, and a short portion having a longitudinal length less than this value for a long part, and inclined in a direction opposite to the direction of the long side, with respect to the longitudinal direction.

The zigzag edge, mentioned above, may be axially inner edge or the axially external edge of the longitudinal grooves of the crown, and a wavy edge, mentioned above, may be axially inner edge or the axially outer edge of the groove. Preferably a short part of the cut edges of the groove, having L-shaped, extends from one end of the long part of this segment in the direction opposite long side relative to the axial direction of the tire. Preferably, the longitudinal length of the step lengths of the edges of the grooves having L-shaped, less than the longitudinal length of the step curved segments of the edge grooves. PE is the first slot may be formed approximately in the middle of each cut edge of the groove, having L-shaped, and the second slot may be additionally formed in the place, located opposite the first slot in each arcuate segment of the edge grooves. A pair of secondary longitudinal grooves passing continuously in the longitudinal direction of the tire, may be formed axially on the outside of the longitudinal grooves of the crown with the provision of the contact area with the ground to the crown, passing continuously in the longitudinal direction between the longitudinal grooves of the crown, middle areas of contact with the ground, each of which is limited by a longitudinal groove of the crown and the average longitudinal groove, and a shoulder areas of contact with the ground, each of which is limited to the average longitudinal groove and the edge of contact with the ground. Preferably the average longitudinal grooves have such an edge, the edge side of the tire equator passes rectilinearly in the longitudinal direction and the edge-side edge of the ground contact is held in the longitudinal direction of the zigzag. The slots and/or the slats can be formed in the middle areas of contact with the ground, and the lugs may be formed in the shoulder areas of contact with the ground.

Since the longitudinal grooves of the crown have a zigzag edge, including the above-mentioned segments L-shaped, on the one hand, for example, with the axially inner side, and odnoobrazno edge, including the aforementioned arcuate segments, on the other hand, for example, with the axially outer side of each longitudinal groove of the crown formed of repeated narrow areas and larger areas. So, thanks to the wide reach areas of good features push snow to improve the characteristics of the snow, and, on the other hand, due to the narrow portions of the groove remains the rigidity of the blocks, thereby preventing significant decrease stability control and uneven wear on dry pavement.

Brief description of drawings

figure 1 shows the expanded view of the tread of a pneumatic tire showing an embodiment of the present invention;

figure 2 presents the cross-section taken along the line X-X in figure 1;

figure 3 presents an enlarged detailed view of area A shown in figure 1;

on Figa provides a partial enlarged view of the edge 3m grooves on one side, shown in Fig.3,

on FIGU provides a partial enlarged view of 3n edges of the grooves on the other side, shown in Figure 3;

figure 5 presents an enlarged detailed view of area B shown in Fig 1;

figure 6 provides a partial enlarged view of 4n edges of the groove-side edge Te of contact with the ground, shown in Figure 5,

on Figa presents a detailed view of the dem is strenuously design longitudinal grooves of the crown, formed in comparative example 1 described later,

on FIGU presents a detailed view showing the construction of the longitudinal grooves of the crown, formed in comparative example 2 described later,

on Figs presents a detailed view showing another example of the longitudinal grooves of the crown in accordance with the present invention.

The embodiment of the present invention is described hereinafter with reference to the accompanying drawings.

Figure 1 and 2 shows the pneumatic tire 1 of this embodiment, which can be used, for example, as a radial tire for passenger cars. The protector 2, the pneumatic tire 1 is provided with a pair of longitudinal grooves 3 of the crown, located on both sides of the equator of the tire and passing continuously in the longitudinal direction of the tire, and a pair of secondary longitudinal grooves 4, which are located axially outside of the longitudinal grooves of the crown 3 and passing continuously in the longitudinal direction.

As shown in figure 1, the protector 2 includes the region 5 soil contact crown held continuously in the longitudinal direction between the longitudinal grooves 3A and 3B of the crown, the middle region 6 ground contact located between each of the longitudinal groove 3 of the crown and each median longitudinal groove 4, and the shoulder region 7 contact with the ground, spaced axially SN is rugi average longitudinal grooves 4 of the crown.

Figure 2 presents the cross-section of the longitudinal grooves 3 of the crown and the average longitudinal grooves 4. From the point of view of preserving the rigidity of the region 5 soil contact crown while ensuring the characteristics of the buoyancy of water or snow on a sufficient level, preferably axial width T1 of the longitudinal grooves 3 of the crown is from 6.0 to 9.0% of the width TW of the ground contact of the tread. Similarly, preferably the axial width T2 of average longitudinal grooves 4 is from 5.0 to 7.0% of the width TW of the ground contact of the tread. In particular, if the width T1 of the grooves of the crown 3 is greater than the width T2 of the middle grooves 4, antiquarian additionally improved because the improved property drainage area near the equator With tires, in which the ground pressure is the greatest.

The term "width TW of the ground contact of the protector", as used here, means an axial distance between the edges Te, Te bottom contact of the tread 2 of the tire which comes in contact with a flat surface, when the tire is mounted on a standard rim and inflated to a normal internal pressure, and the tire in such a standard condition load standard load. Incidentally, the sizes of the respective parts or areas tyres represent the values measured in the above-mentioned standard state if the e specified otherwise.

The term "standard rim", as used here, means a wheel rim defined for each bus in the system of standardization, which is based bus, and means, for example, the "standard rim" in the JATMA (Japan Association of manufacturers of automotive tires), "model bus" in the system TRA (Association for the rims and tyres North America), and "measuring wheel" in the ETRTO (European technical organization rims and tires). Also, the term "normal internal pressure", as used here, means the air pressure specified for each bus in the system of standardization and means, for example, "maximum air pressure" in the system JATMA, the maximum value of the pressure specified in the table Within loads of tyres at different pressures of the cold pumping system TRA, and "inflation pressure" in ETRTO, provided that in the case of passenger cars, the "normal internal pressure is 180 kPa. In addition, the term "standard load" means a load defined for each bus in the system of standardization, which is based bus, and means "maximum load capacity" in the system JATMA, the maximum value indicated in the table "Within the bus loads at different pressures of the cold pumping system TRA, and the "load capacity" in ETRTO, provided that in case of tires for passenger cars "standard is Naya load is 88% of the load, defined above.

It is desirable to improve the characteristics of pushing snow and property drainage in area 5 in contact with the ground to the crown, in which the ground pressure is the greatest. It is also desirable to improve the effect of heat dissipation in the region 5 soil contact of the crown, as the heat in this area when the movement is large and there is excessive wear due to thermal aging of rubber. Thus, preferably the depth U1 longitudinal grooves 3 of the crown is at least 6 mm, particularly preferably at least 7 mm, and not more than 11 mm, particularly preferably not more than 10 mm

Preferably the depth of U2 medium longitudinal grooves 4 is less than the depth U1 longitudinal grooves 3 of the crown, as the ground pressure medium shoulder regions 6 and 7 in contact with the ground is less than the pressure area 5 in contact with the ground to the crown, and the dissipation in this area are also less. From this point of view and from the point of view of balance of rigidity between the average area 6 in contact with the ground, shoulder region 7 contact with the ground and the region 5 soil contact crown, preferably the depth of U2 medium longitudinal grooves 4 is at least 5.5 mm, particularly preferably at least 6.5 mm and not more than 10.5 mm, particularly preferably not more than 9.5 mm

Figure 3 shows the fragment pair is rodilnyj grooves crown 3A and 3D in a larger view. The edge on one side of the longitudinal grooves 3 of the crown formed zigzag, so that the segments 3s edges, having L-shaped, continuously connected to each other in the longitudinal direction of the tire, each of the edge segments in an L-shape includes a first long portion 3c, tilted to one side at an angle 9 is greater than 0° relative to the longitudinal direction of the bus, and the first short part 3t having a longitudinal length less than this value for a long part 3c, and oppositely inclined relative to the long side in the longitudinal direction. In this embodiment represented in the drawings, the edge 3m grooves located on the sides of the equator With tires, formed in a zigzag manner through repetition of segments of edges of L-shaped form. Edge on the other side of the longitudinal grooves 3 of the crown formed in waves, so that the segments 3o edges of the groove having a curved shape convex toward the Central longitudinal groove 3 of the crown, continuously connected to each other in the longitudinal direction of the tire. In this embodiment represented in the drawings, the edge 3n grooves located on the side edge Te of contact with the ground, formed into a wave shape by repeating the arcuate lengths of the edges of the notch.

The width T1 of such longitudinal grooves 3 of the crown varies n is discontinuously in the differences of edge 3m grooves on one side and 3n edges of the grooves on the other side. Thus, section H the greatest width of the groove, where the width T1 of the groove reaches its maximum, and the area S of the smallest width of the groove, where the width T1 of the groove reaches its minimum, formed a recurring image in the longitudinal direction. Longitudinal grooves 3 of the crown, having such a form, serve to improve the features on snow, as they effectively compacted snow and show great shearing force compacted columns of snow.

If the tilt angle 8 long part 3c zigzag edges 3m small zigzag edge 3m approaching straight edge, and the shear bars snow decreases. On the other hand, if the angle 0 of inclination is too great, it can easily happen uneven wear in the field 5 in contact with the ground to the crown. From this point of view, preferably the angle 9 of inclination is at least 1.0°, preferably at least about 1.5°, even more preferably at least 2,0°and not more than 20°, preferably not more than 15°, even more preferably not more than 8°.

Figure 4 provides a partial enlarged view of the zigzag edge 3m grooves. Long part 3c is formed so that it has an axial length "a" is greater than the axial length "b" of the short portion 3t. If the ratio a/b is too small, the rate of change of stiffness region 5 soil contact crown is large, so is egco can happen uneven wear. If the ratio a/b is too large, the edge effect of the short part 3t small, with limited amplitude A1, and the edge 3m approaching straight edge, so that the effect of buoyancy columns snow is falling. From this point of view, preferably the ratio a/b is at least 5, particularly preferably at least 8 and not more than 20, particularly preferably not more than 15.

In addition, in this embodiment the segments 3s edges of the groove, having L-shaped, formed with a longitudinal length P1 of the step is less than the longitudinal length P2 step arcuate segments 3o edges of the grooves, as shown in Figure 3. Thus, the short part 3t segments 3s edge of the L-shaped formed at locations where the width of the groove varies sharply, such as the wide areas and/or narrow sections of the longitudinal grooves 3 of the crown, whereby the characteristic of removing snow can be further improved, as the regional elements of short pieces 3t effectively used.

Preferably the ratio P2/P1 is at least 1.5, particularly preferably at least a 1.8 and not more than 2.5, particularly preferably not more than 2.2. In this embodiment represented in the drawings, the ratio P2/P1 of the step length is equal to 2. Preferably, the short part 3t segments 3s edge of the groove of the L-shape is formed in the x, axially opposite concave parts o1, which represent both ends of each arcuate segment 3o edges, grooves, and/or convex axially inward parts o2, in which the arcuate segments 3o edges of the groove most are given inside in the axial direction, whereby the difference between the width of the groove at sites H maximum width and sites S minimum width becomes large, so that the longitudinal grooves 3 of the crown have a zigzag shape. Thus, the shear bars snow grooves 3 of the crown is additionally improved.

On FIGU provides a partial enlarged view of a wavy edges 3n grooves. If the ratio c/R axial distance c between the concave part o1 and the convex part of o2 to the radius of curvature R of the arcuate segment 3o edge of the groove is too large, the difference of hardness in region 5 soil contact crown becomes large, so that there can be uneven wear. If the ratio c/R is too small, the edge 3n approaching straight edge, so don't get sufficient edge effect, and the effect of buoyancy columns snow is falling. From this point of view, preferably the ratio c/R is at least 0,0013, particularly preferably at least 0,0026, and not more than 0,028, particularly preferably not more than 0,023. For the same when the ine, as noted above, preferably the radius of curvature R is at least 125 mm, especially preferably at least 150 mm and not more than 425 mm, particularly preferably not more than 390 mm

If the short part 3t zigzag edges 3m formed at locations opposite convex parts o2 wavy edges 3n, as shown in Figure 3, formed through this area To sharply varying width on the areas S of the minimum width of the groove. Thus, because of the wide areas of the grooves formed in the vicinity of S the minimum width, in which the characteristic pushing snow is reduced due to a small width, the characteristic pushing snow continues and, accordingly, improves the characteristics of the snow.

If the width of the grooves at the areas's minimum width is too small, the characteristic of removing snow is reduced, and if the width of the grooves on the widest parts of N is too large, the rigidity of the region 5 soil contact crown decreases and, accordingly, it could lead to uneven wear. From this point of view, preferably the ratio of Th/Ts the width of the groove Tn on sites N the maximum width of the groove to the width Ts of the grooves at the areas S of the minimum width of the groove is at least 1.3, particularly preferably at least 14, and not more than 1.8, particularly preferably not more than 1.7.

Longitudinal grooves 3 of the crown as a whole is formed in a zigzag form. This means that the Central line G1 of the groove 3 has a zigzag shape. As such zigzag groove has a longer edge than a straight groove, for adhesion to the icy road surface, in particular a clutch during movement in the rotation, it is desirable that the amplitude A1 of the zigzag edge was great. On the other hand, if the amplitude A1 is too large, the rigidity of the region 5 soil contact crown decreases. From this point of view, preferably, as shown in figure 3 and 4A, the ratio A1/Th (%) of the full value of the amplitude A1 in the axial direction of the width of Tn grooves in areas H, with a maximum width of the groove is at least 8%, particularly preferably at least 10%and not more than 22%, particularly preferably not more than 20%.

In this embodiment of the considered longitudinal groove of the crown 3 with zigzag edge 3m grooves of the equator With tires and wavy edge 3n groove side edges of The contact with the ground, but it goes without saying that a wavy edge 3n grooves may be formed on the sides of the equator of the tire and the zigzag edge 3m grooves can be formed from the side edges of The contact with the ground, which in this longitudinal groove of the crown, you can expect the same effect. When the zigzag edge 3m grooves formed by the equator With the tire may be provided with a large regional component in the direction of traction in region 5 in contact with the ground to the crown, where the ground pressure is greatest, whereby the force of the grip on icy roads is improved along with the improvement of the shearing forces within the snow on a snow-covered road surfaces, which provides improved stability of control on an icy and snowy road surfaces. Therefore, it is preferable to form the zigzag edge 3m from aquatory bus.

In addition, as shown in Figure 3, the first narrow slot 10 may be formed in each segment 3s edge of the L-shaped longitudinal grooves 3A or 3B of the crown, so that one end of the slot 10 is connected to approximately the middle part of the first long part 3c 3s cut edges, and the other end of the slot 10 does not reach the opposite zigzag edges of the other longitudinal grooves 3B or 3A crown, located on the opposite side relative to the equator With tires. The term "slot"as used here means such a narrow groove that one end is in contact with the soil and its axial length is small. The slits are used to better balance the stiffness of the contact area with the ground. Since cu is a Wake component, given formed in the longitudinal direction of the tyre edges 10e of the grooves is increased on the surface of the tread, through the first slots 10, the shear bars of snow in the region 5 soil contact crown further enhanced. "About the middle part of" the first long part 3c 3s cut edges means the region of 30% of the longitudinal length "a" of the long portion 3c, and the center area is located at the midpoint Y of length "a", in other words, this means the area extending from the middle point Y in the longitudinal direction on both sides up to 15% of the length "a".

If the axial length W1 of the first slot 10 is too large, the rigidity of the region 5 soil contact crown decreases and, accordingly, it could lead to uneven wear. On the other hand, if the axial length W1 is too small, do not expect sufficient increase of the shearing forces within the snow. From this point of view, preferably the ratio W1/Tc (%) axial length W1 of the grooves 10 to the axial width of the Cu region 5 soil contact crown is at least 32%, particularly preferably at least 35%and not more than 43%, particularly preferably not more than 40%.

In addition, as shown in Figure 3, the arcuate segments 3o edges of the longitudinal grooves 3 of the crown can be formed in the second slot 11 located opposite to the first slots 10, so preferred is entrusted, the first slot 10, the second slot 11 and the longitudinal groove 3 of the crown form the intersection at approximately the shape of a cross when viewed from above. As the regional component of the second slits 11 is added to the regional component of the first slits 10 and as a cruciform columns of snow with high hardness can be formed in the contact area with the ground, you can get a large shearing force of the snow.

The expression "second slots 11 located opposite to the first slits 10" means that each second slot 11 is formed so that it includes the point "i" of intersection of the arcuate segment 3o edges with the line "f", which is a continuation of the Central line G3 of the first slot 10.

Preferably, as shown in figures 1 and 3, grooves, fins and other holes are not formed in the region 5 soil contact of the crown, except for the first and second slots 10 and 11, so as to provide greater rigidity regions 5 and 6 in contact with the ground to the crown and middle of the field and, therefore, expect the suppression of uneven wear and improve stability control on a dry road surface, in particular, in region 5 in contact with the ground to the crown, where the ground pressure is high.

Figure 5 shows a part of the middle and shoulder regions 6 and 7 in contact with the ground in a larger view.

The average longitudinal grooves 4 have to the omcu 4m, passing rectilinearly in the longitudinal direction of the equator C bus. Edge 4n side edge Te of contact with the soil medium longitudinal grooves 4 formed zigzag, so that the second long part 4c is inclined relative to the longitudinal direction, and a second short portion 4t having a longitudinal length less than this value for a long part 4c, and is inclined in a direction opposite to the tilt direction of the long side 4c, at an angle α relative to the longitudinal direction, are formed continuously and alternately. Thus, the edge 4n grooves from contact with the soil passes zigzag. These average longitudinal grooves 4 are used for improving the characteristics of pushing snow and shearing forces within the snow, as well as in the longitudinal grooves 3 of the crown. In particular, since the edge 4m grooves from the side of the tire equator passes rectilinearly, you can suppress this behavior, as shaking or sideslip of the vehicle during braking, and accordingly, it is possible to ensure good stability of the control.

As shown in Figure 5 and 6, the average longitudinal grooves 4 are generally zigzag in the longitudinal direction. This means that the Central line G2 of the groove 4 has a zigzag shape. As such zigzag groove has more DL the config edge of the groove, than a straight groove, for adhesion to the icy road surface, in particular a clutch during pressure on the rotation, it is desirable that the amplitude A2 zigzag edges 4n was great. On the other hand, if the amplitude A2 is too large, the rigidity of the shoulder region 7 contact with the ground is reduced. From this point of view, preferably the ratio A2/Ti (%) amplitude A2 to the maximum width Ti average longitudinal grooves 4 is at least 15%, especially preferably at least 18%, and not more than 30%, particularly preferably not more than 27%.

If the angle of inclination α of the short portion 4t zigzag edges 4n small edge 4n side edge contact with the ground approaching a straight line, instead of the zigzag line, and the force of buoyancy columns snow is reduced as the edge effect is reduced. On the other hand, if the angle α is too large, can easily happen uneven wear in the shoulder region 7 contact with the ground, as the change in the stiffness becomes large. From this point of view, preferably the angle α is at least 45°, particularly preferably at least 50°and not more than 80°, particularly preferably not more than 75°.

In addition, as shown in Fig.6, the second long part 4c is formed so that it has an axial length "d" is greater th the axial length "e" of the second short side 4t. If the ratio d/e is too small, can easily happen uneven wear in the shoulder region 7 contact with the ground. If the ratio d/e is too large, the edge 4n groove side edges of The contact with the ground approaching straight edge, so that the effect of buoyancy columns snow decreases because of reduced edge effect. From this point of view and from the point of view of balance of rigidity between the regions 5, 6 and 7, preferably the ratio d/e is at least 20, particularly preferably at least 25 and not more than 50, particularly preferably not more than 45.

As shown in Figure 5, the average of the slot 12 extending from the middle longitudinal grooves 4 toward the equator of the tire and not reaching the longitudinal grooves 3 of the crown can be generated in each secondary region 6 contact with the ground, whereby the regional component in the direction of the traction force and the volume of the grooves remain large in the middle pane 6 in contact with the ground, where the ground pressure is relatively high, which further improve the performance on icy and snowy road surfaces.

The ratio P4/P3 longitudinal length P4 step 4n edges of the groove-side edge of the ground contact to the longitudinal length of the step P3 medium of the slots 12 is not limited in a particular way. However, if the ratio P4/P3 is too large, the average longitudinal anaka 4 is close to a straight groove, so the shear bars snow is reduced and the stability control on a snowy road surfaces decreases. If the ratio P4/P3 too small, the rigidity of the shoulder region 7 contact with the ground is reduced and can easily happen uneven wear. From this point of view, preferably the ratio P4/P3 is at least 1.5, particularly preferably at least a 1.8 and not more than 2.5, particularly preferably not more than 2.2. In this embodiment represented in the drawings, the ratio of R4/R3 is 2.

If the axial length W3 of the middle slots 12 is too large, the rigidity of the middle pane 6 in contact with the ground is markedly reduced, so that can happen uneven wear in the early stages of operation and shearing blocks. On the other hand, if the axial length W3 is too small, it is impossible to provide sufficient regional elements this viewpoint, preferably, the sum (W3+W2) axial length W3 middle of the slot 12 and the axial length W2 of the second slot 11 is 60%, especially preferably at least 65% of the axial width of the average Tm region 6 contact with the ground, and not more than 85%, particularly preferably not more than 80% of the width Tm of contact with the ground.

In addition, as shown in Figure 5, two middle lamella 14 passing from the average longitudinal grooves 4 in the direction of the equator With tires that can be SF is mirovni between adjacent in the longitudinal direction of the medium slots 12, 12 in the middle pane 6 in contact with the ground.

Two middle lamella 14 located in each region between the neighboring in the longitudinal direction of the medium slots 12 include a first middle plate 14a with a smaller axial length and the second middle plate 14b with a greater axial length than the first slats 14a. The axially inner end side of the equator of the tire first middle lamella 14a is located within the middle region 6 contact with the soil and does not reach the longitudinal grooves 3 of the crown. The axially inner end side of the tire equator second middle lamella 14b reaches and connects with the second slot 11 located in the longitudinal groove 3 of the crown, whereby the regional component of the middle lamella 14 as a whole is increased, the suppression of decreasing the hardness of the middle pane 6 in contact with the ground. Thus, the stability control on a dry road surface, and the characteristics of the ice can be improved in a balanced manner.

As shown in Figure 5, the shoulder region 7 contact with the ground can be provided with a shoulder lugs 13 extending from the outer side edges of The bottom contact in the axial direction to the equator With the tire over the edge of The contact with the ground and not reaching median longitudinal groove 4.

Shoulder lugs serve to smoothly divert water to the snowy Dor is GE or rainwater outside edges of The contact with the ground, so the stability control is additionally improved. On the other hand, if the axial length W4 of the shoulder lug 13 is too great, the force of the clutch when driving in rotation on a dry road surface is reduced, impairing the stability control. From this point of view, preferably the ratio W4/Tn (%) axial length W4 to the axial width of the shoulder Tn area 7 soil contact is at least 70%, particularly preferably at least 75%, and 90%, especially preferably not more than 85%.

Although edge 13m and 13n shoulder lugs 13 may be beveled, preferably edge 13m and 13n of the grooves is not beveled, as such edges to effectively operate on icy roads and more effective in suppressing the reduction of shearing forces within the snow. Shoulder lugs 13 are located so that the angle of inclination relative to the longitudinal direction more than this value for the average of the slots 12, through which can be increased adhesive force of the shoulder regions 7 in contact with the ground, where the ground pressure when driving on a large bend.

In the embodiment represented in the drawings, the right half of the tread and the left half of the tread pattern symmetrical about a point.

Although the described preferred embodiment of the present invention with reference to the drawings,it is clear that the present invention is not limited to this embodiment and may be made of various modifications and changes.

The present invention is more fully described and explained through the following examples. It should be understood that the present invention is not limited to these examples.

Examples

Radial passenger car tires, size 195/65R15, having a tread pattern presented in figure 1, were made on the basis of technical characteristics is presented in table 1. Other technical characteristics of the tire are common to all tires and General technical specifications in respect of the tread pattern are as follows.

The width TW of contact of the tread with the ground: 162 mm

The ratio T1/TW width T1 of the longitudinal grooves of the crown to TAL/: 7,5%

The ratio T2/width TW T2 average longitudinal grooves to TW: 6%

Depth U1 longitudinal grooves crown: 9.5 mm

Depth U2 medium longitudinal grooves: 9.5 mm

The ratio c/R axial distance c between the concave part o1 and the convex part of o2 to the radius of curvature R of the arcuate segment 3O edge: 0,009

The ratio of Th/Ts Th width plot H the maximum width of the groove to the width Ts of the site's minimum width of the groove: 1,62

The ratio P2/P1 of the longitudinal length P2 step arcuate segment 3o edges to the longitudinal length P1 of the step segments 3s edge L-breznay form: 2

The ratio A1/Th amplitude A1 of the longitudinal grooves of the crown to the width of Th plot N the maximum width of the groove: 0,205

The ratio W1/Tc axial length W1 of the first slit 10 to the axial width of the Cu region 5 soil contact crown: 0,33

The ratio A2/Ti amplitude A2 zigzag edges 4n to the maximum width of the Ti medium longitudinal grooves 4: 0,23

The ratio d/e axial length "d" of the second long side 4 C of the axial length "e" of the second short side 4t zigzag edges 4n medium longitudinal grooves: 36.

Tires were mounted on four-wheel drive Japanese 3500, provided the internal pressure of 200 kPa and had the following characteristics: running feature on snowy road surfaces, resistance control and resistance to uneven wear. The testing procedures described below.

Running characteristics on snow-covered roads

Test vehicle specified above was tested on the test route road surface with the compacted snow, and characteristics such as reaction wheels to control, the feeling of stiffness and adhesion was evaluated by the feeling of the driver. The results are presented in the form of an index based on comparative example 1 taken as 100. The higher the value, the better the results.

Stability control

Ispytatel the hydrated car felt on the route for testing on a dry road surface, and characteristics such as reaction wheels to control, the feeling of stiffness and adhesion was evaluated by the feeling of the driver. The results are presented in the form of an index based on comparative example 1 taken as 100. The higher the value, the better the results.

The resistance to uneven wear

The test vehicle was tested in mileage 3000 km on a dry road surface. With regard to the area of contact with the ground to the crown and the average contact area with the ground, the difference in wear between one axial end and another end of each of the contact area was measured in four places in the longitudinal direction and the determined average value for each area. The results are presented in the form of indicator, reverse the obtained average value, on the basis of comparative example 1 taken as 100. The higher the value, the better the resistance to uneven wear.

The results are presented in table 1.

From the table it is obvious that the tires according to examples of the present invention possess improved running characteristics on snow-covered road surfaces. It is also clear that the resistance to uneven wear is acceptable.

Table 1
the Cf. app.1Cf. PRApp.1PRPRPRPRPR
Longitudinal grooves of the crown
FormFigaFIGU333333
The angle θ of the first long side (°)05,01,03,05,0105,05,0
The ratio a/b of the length of the longest side to the length of the short side-1010 101010520
The amplitude A1 (mm)-30,51,42,44,82,22,5
The radius of curvature R (mm)--300300300300300300
Distance: c (mm)--333333
The presence of the first slotsnononononononono
The presence of second slots nononononononono
The average longitudinal grooves
The angle α of the second short side (°)6565656565656565
The steps P4/P322222222
The results of the tests
Feature on snow-covered roads100101102105107108103102
Stability control100100100100100989899
The resistance to uneven wear100100100100999599100
* Form of medium and shoulder areas of contact with the ground is shown in figure 1.

Continuation of table 1
PRPRPR PRProverbs 11PRPRPR
Longitudinal grooves of the crown
Form33333333
The angle θ of the first long side (°)5,05,05,05,05,05,05,05,0
The ratio a/b of the length of the longest side to the length of the short side1010101010101010
The amplitude A1 (mm)2,42,42,42,42,42,42,42,4
The radius of curvature R (mm)300300300300100200400500
Distance: c (mm)12453333
The presence of the first slotsnononononononono
The presence of second slotsnonononot the nononono
The average longitudinal grooves
The angle α of the second short side (°)6565656565656565
The steps P4/P322222222
The results of the tests
Characteristics of the snowy Dor is mportant coverage 103107110113105104105105
Stability control100100989810010010098
The resistance to uneven wear100100989599999999
* Form of medium and shoulder areas of contact with the soil are presented in figure 1.

Longitudinal grooves of the crown
Continuation of table 1
PRPRPRPRPRPRPR
Form3Figs33333
The angle θ of the first long side (°)5,05,05,05,05,05,05,0
The ratio a/b of the length of the longest side to the length of the short side10101010101010
The amplitude A1 (mm)2,42,42,42,42,42,42,4
The radius of curvature R (mm)300300300300300300300
Length c: (mm)3333333
The presence of the first slots
The presence of second slotsno
The average longitudinal grooves
Lu is l α the second short side (°) 65656545806565
The steps P4/P32222213
The results of the tests
Feature on snow-covered roads108108110105110112102
Stability control10010010010010098100
The resistance to uneven wear 98981001009595100
* Form of medium and shoulder areas of contact with the soil are presented in figure 1.

1. Pneumatic tire including a tread containing a pair of longitudinal grooves of the crown, passing continuously in the longitudinal direction of the tire on both sides of the equator of the tire and having edges, with one edge of each of the specified longitudinal grooves of the crown passes zigzag, so that the segments of the edges of the grooves having L-shaped, continuously connected to each other in the longitudinal direction of the tire, and the other edge of the groove passes wavy way, so that the arcuate segments of the edges of the grooves having an arcuate bulge toward the center of the groove, continuously connected to each other in the longitudinal direction of the bus, where each of these segments of the edges of the grooves in an L-shape includes a long portion at an angle of from 1° to 20 ° relative to the longitudinal direction, and a short portion having a longitudinal length less than this value for the specified long side, and is inclined in a direction opposite to the direction indicated long part, relatively what about the longitudinal direction.

2. Pneumatic tire according to claim 1, in which the longitudinal length of the step described segments of the edges of the groove of the L-shape is less than the longitudinal length of the step mentioned arcuate lengths of the edges of the notch.

3. Pneumatic tire according to claim 1, in which the first slot is located approximately in the middle part of each of the specified segment of the edge groove is L-shaped.

4. Pneumatic tire according to claim 3, in which the second slot is located in the place, located across from the specified first slits, each specified arcuate segment edges of the notch.

5. Pneumatic tire according to claim 1, in which a pair of secondary longitudinal grooves passing continuously in the longitudinal direction of the tire, is located axially outside of these longitudinal grooves of the crown to ensure the contact area with the ground to the crown, passing continuously in the longitudinal direction between the longitudinal grooves of the crown, middle areas of contact with the ground, each of which is limited by a longitudinal groove of the crown and the average longitudinal groove, and a shoulder areas of contact with the ground, each of which is limited to the average longitudinal groove and the edge of contact with the ground, and these longitudinal grooves are of such edges, the edge located on the side of the tire equator, runs rectilinearly in the longitudinal direction, and the edge located on the side edge of the ground contact, passes zigzag in the longitudinal direction.

6. Pneumatic tire according to claim 4, in which the contact area with the ground to the crown between these longitudinal grooves of the crown takes place continuously in the longitudinal direction and does not contain any grooves, sipes and other cuts, except those of the first and second slits.

7. Pneumatic tire according to claim 5, in which the averages of the contact area with the ground is equipped with medium slits passing from the said longitudinal middle of the grooves toward the equator of the tire and not reaching these longitudinal grooves of the crown.

8. Pneumatic tire according to claim 5, in which the mentioned shoulder region of the ground contact includes a shoulder lugs extending from the outer side edges of the ground contact in the axial direction to the equator of the tire, through the region of contact with the ground and not reaching above average longitudinal grooves.

9. Pneumatic tire according to claim 7, in which two middle lamella, passing from the said middle longitudinal grooves toward the equator of the tire, are located in each region between the neighboring in the longitudinal direction of the middle slots in the middle areas of contact with the ground.

10. A pneumatic tyre according to claim 9, in which the two middle lamella include first middle lamella and the second middle lamella with b is a larger axial length, than this value for a specified first slats, and the axially inner end side of the equator of the tire specified first middle lamella does not reach the longitudinal grooves of the crown.

11. A pneumatic tyre according to claim 9, in which the two middle lamella include first middle lamella and the second middle lamella with a greater axial length than the length of the specified first slats, and the axially inner end side of the equator of the tire to the specified second middle lamella reaches and connects with the second slot located in the longitudinal groove of the crown.

12. Pneumatic tire according to claim 1, in which the first slot is located approximately in the middle part of each of the specified cut edges of the groove of the L-shaped second slot is located in the place, located across from the specified first slots each specified arcuate segment edges, a pair of secondary longitudinal grooves passing continuously in the longitudinal direction of the tire, is located axially outside of these longitudinal grooves of the crown to ensure the contact area with the ground to the crown, passing continuously in the longitudinal direction between the longitudinal grooves of the crown, middle areas of contact with the ground, each of which is limited by a longitudinal groove of the crown and the average longitudinal groove, and a shoulder areas of contact with the ground, each is which is limited to the average longitudinal groove and the edge of contact with the ground, where the averages longitudinal grooves have such an edge, that edge is located on the side of the tire equator passes rectilinearly in the longitudinal direction, and the edge located on the side edge of the ground contact, is zigzag in the longitudinal direction, and the contact area with the ground to the crown does not contain any grooves, sipes and other cuts, except those of the first and second slits, and the averages of the contact area with the ground is equipped with medium slits passing from the said middle longitudinal grooves toward the equator of the tire and not reaching these longitudinal grooves of the crown.

13. Pneumatic tire according to item 12, in which the averages of the contact area with the ground is equipped with medium slits passing from the said middle longitudinal grooves toward the equator of the tire and not reaching these longitudinal grooves of the crown.

14. Pneumatic tire according to item 12, in which the shoulder region of the ground contact includes a shoulder lugs extending from the outer side edges of the ground contact in the axial direction to the equator of the tire, through the region of contact with the ground and not reaching above average longitudinal grooves.

15. Pneumatic tire according to item 13, in which two middle lamella, passing from the said medium p is dolnych grooves toward the equator of the tire, located in each region between the neighboring in the longitudinal direction of the middle slots in the middle areas of contact with the ground.

16. Pneumatic tire according to item 15, in which the two middle lamella include first middle lamella and the second middle lamella with a greater axial length than the value specified for the first lamella and the axially inner end side of the equator of the tire specified first middle lamella does not reach the longitudinal grooves of the crown.

17. Pneumatic tire according to item 15, in which the two middle lamella include first middle lamella and the second middle lamella greater axial length than the value specified for the first lamella and the axially inner end side of the equator of the tire to the specified second middle lamella reaches and connects with the second slot located in the longitudinal groove of the crown.



 

Same patents:

FIELD: transport.

SUBSTANCE: tire tread has at least two wearing plies including outer wearing ply and at least one inner wearing ply located at mid tread under outer wearing ply, and at least one outer groove located in outer wearing ply. Besides, said tread features volumetric cavity ratio of 0.25-0.40 in sound state and of about 0.25-0.40 in worn-out state. External side interacting with ground extends along one of inner wearing ply in worn-out tread. Additionally, said tread features contact surface ratio of 0.66-0.72 in sound state and of about 0.56-0.66 in worn-out state.

EFFECT: enhanced performances.

15 cl, 19 dwg

FIELD: transport.

SUBSTANCE: tire has tread (1) including at least one groove (3) of circular orientation and multiple raised elements (21, 22). Note here that every said raised element comprises contact side (11) with crosswise width Lt and lateral walls (210). Note also that there is at least one raised element with multiple noise killing devices. Note that every said device has elongated cavity (4) of total volume Vc to open toward lateral wall (210). Note that said cavity features total length Lc larger than said length Lt and geometry that includes several interconnected parts (40, 41, 42, 43, 44, 45). Note also that length Lc makes the sum of parts of said cavity. Note that every said cavity (4) extends over the entire length Lc with notch (5) extending radially outward out to rolling surface. Note that sum tread sum Ly of lengths in projection in crosswise direction of every cavity is at least 1.5 times larger than the sum Lx of length in projection if the cavity circumferential direction.

EFFECT: perfected noise killing.

9 cl, 8 dwg

Pneumatic tire // 2521455

FIELD: transport.

SUBSTANCE: pneumatic tire includes tread section which contains ring grooves (2-4) running in circular direction of tire, as well as lateral grooves (5, 6) running in direction of tire width, and multiple road-contacting blocks (7), separated by ring and lateral grooves. Each of road-contacting blocks contains lamellae (8), which run from tread running surface inside blocks to specified depth in radial direction of tire, herewith, each one of lamellae has end section communicating with at least any one of ring and lateral grooves. At least one of multiple lamellae contains widening ring-shaped section on its inner end in radial direction of tire. Herewith, the widening ring-shaped section is increased in its diameter gradually and smoothly running to side walls of road-contacting block.

EFFECT: creation of pneumatic tire with high drainage effect, as well as prevention of tearing lamella in tire tread.

9 cl, 12 dwg, 1 tbl

Pneumatic tire // 2521052

FIELD: transport.

SUBSTANCE: invention relates to tread pattern of automobile non-spiked tire with improved noise characteristics. Pneumatic tire includes axially-internal lengthwise rows of crown blocks which rows are located at each side of tire equator, and axially-external lengthwise rows of shoulder blocks which rows are located axially to the outside of axially-internal lengthwise rows. Crown blocks are longitudinally separated by the first and the second interleaving transverse grooves of the crown. Shoulder blocks are longitudinally separated by the first and the second interleaving transverse shoulder grooves. The first transverse shoulder grooves have width of not less than 3.5 mm. The first transverse crown grooves have width of not less than 2.0 mm. The second transverse shoulder grooves include axially-internal slit-shaped portion with width of 0.5 to 2.0 mm and axially-external main portion at least 3.5 mm wide. The second transverse crown grooves include axially-internal slit-shaped portion with width of 0.5 to 2.0 mm and axially-external main portion at least 2.0 mm wide.

EFFECT: better tire noise characteristics without impairment of running characteristics over snow-covered road surface.

9 cl, 5 dwg, 1 tbl

Automotive tire // 2521033

FIELD: transport.

SUBSTANCE: invention relates to automotive winter tire tread design. Tire (1) has tread (2) containing central part (L1) covering from two sides the equatorial plane (7), and two shoulder parts. The central part (L1) is separated from shoulder parts (L2, L3) of tread by two first circumferential grooves (3, 6). At least two second circumferential grooves (4, 5) are located in the central part (L1). The second circumferential grooves (4, 5) determine margins of the central circumferential bar (10) containing multiple sipes (20) located in parallel to each other and at certain distance from each other. The second circumferential grooves (4, 5) have a mid line running as peak-to-valley scallops throughout tire length in direction along circumference. The mid lines with peak-to-valley scallops are mainly matching in phase with each other throughout tire length (1) in direction along circumference.

EFFECT: better operational properties when moving both over snowy and dry and wet road surfaces.

20 cl, 4 dwg, 1 tbl

Pneumatic tire // 2520265

FIELD: machine building.

SUBSTANCE: proposed tire comprises tread zone (A) located from vehicle inner side and tread zone (B) located on vehicle outer side. There are multiple slot-like drain grooves (32A, 32B) extending over tire width and formed in every block (31A, 31B). The number of blocks (31A) in said zone (A) is larger than that of blocks (31B) in said zone (B). Note here that slot-like drain grooves (32B) in blocks (31B) of zone (B) are configured to extend linearly along their depth. Note here that slot-like drain grooves (32A) in blocks (31A) of zone (A) are configured to extend in wavy manner along their depth.

EFFECT: better road grip on dry road and snow.

7 cl, 4 dwg

Pneumatic tire // 2513210

FIELD: transport.

SUBSTANCE: invention relates to tread pattern of tire designed to be used on dry road, ice- and snow-covered roads. Proposed tire comprises unidirectional tread pattern including right and left lengthwise grooves of the crown and crow rib arranged there between. Crown rib has first and second V-like grooves arranged by turns in the tire lengthwise direction. First V-like grooves extend from the left lengthwise groove of the crown. Second V-like grooves extend from the right lengthwise groove of the crown. First and second V-like grooves terminate nearby the rib while their V-like configurations have inflections located, in fact, at tire equator.

EFFECT: stable motion on dry road, ice- and snow-covered roads.

9 cl, 10 dwg, 1 tbl

Pneumatic tire // 2508996

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Proposed tire comprises multiple circular main grooves extending in tire circumference and multiple running surfaces separated and composed by said circular main grooves in tread zone. Multiple running sections have multiple sipes. At least 90% of sipes located in inner side area represent are 2D sipes and at least 90% of sipes in outer side surface are 3D sipes. Tread zone comprises top and bottom rubber layers. Rubber hardness H1in at -10°C and rubber hardness H2in at 20°C of rubber top layer 151in in inner side area, and hardness H1out at -10°C and hardness H2out at 20°C of rubber top layer 151out in outer side area are related by relationships H1in<H1out and H2in<H2out.

EFFECT: better stability on dry and snowy surface.

18 cl, 9 dwg

Pneumatic tire // 2508995

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Tire tread has circular major grooves extending in tire circumference and contact parts separated and composed on said circular major grooves. Every said central zone contact part and contact parts of right and left shoulder zone has multiple sipes. At least 90% of sipes located in inner side area represent are 2D sipes in central zone and at leas 90% of sipes in outer side surface are 3D sipes in shoulder zone. Every contact parts of right and left shoulder zones has multiple transverse side grooves arranged in definite order in tire circumference. The number N-ce of transverse side grooves in central zone contact part and the number N-sh of transverse side grooves in contact parts of right and left shoulder zones are relates as N-ce>N-sh.

EFFECT: perfected design.

20 cl, 7 dwg

FIELD: transport.

SUBSTANCE: tread comprises multiple raised elements 10 confined by cutouts. At least one of said raised elements 10 has dents 2 of maximum depth H not larger than tread thickness. This dent is located in major direction confined by the dent track ends on new tread and in minor direction extending in tread depth. Dent 2 has first part 21 and second part 22. Dent first part 21 extends in minor direction between contact side 15 in new state and depth H1 equal to, at least, 40% of maximum depth H while second part 22 extends the first part 21 in tread depth. Note here that said second part 22 extends to depth H2. Dent second part 22 in major direction has at least one first section 221 and one second section 222.

EFFECT: improved performances.

10 cl, 7 dwg

Automotive tire // 2521033

FIELD: transport.

SUBSTANCE: invention relates to automotive winter tire tread design. Tire (1) has tread (2) containing central part (L1) covering from two sides the equatorial plane (7), and two shoulder parts. The central part (L1) is separated from shoulder parts (L2, L3) of tread by two first circumferential grooves (3, 6). At least two second circumferential grooves (4, 5) are located in the central part (L1). The second circumferential grooves (4, 5) determine margins of the central circumferential bar (10) containing multiple sipes (20) located in parallel to each other and at certain distance from each other. The second circumferential grooves (4, 5) have a mid line running as peak-to-valley scallops throughout tire length in direction along circumference. The mid lines with peak-to-valley scallops are mainly matching in phase with each other throughout tire length (1) in direction along circumference.

EFFECT: better operational properties when moving both over snowy and dry and wet road surfaces.

20 cl, 4 dwg, 1 tbl

Pneumatic tire // 2520265

FIELD: machine building.

SUBSTANCE: proposed tire comprises tread zone (A) located from vehicle inner side and tread zone (B) located on vehicle outer side. There are multiple slot-like drain grooves (32A, 32B) extending over tire width and formed in every block (31A, 31B). The number of blocks (31A) in said zone (A) is larger than that of blocks (31B) in said zone (B). Note here that slot-like drain grooves (32B) in blocks (31B) of zone (B) are configured to extend linearly along their depth. Note here that slot-like drain grooves (32A) in blocks (31A) of zone (A) are configured to extend in wavy manner along their depth.

EFFECT: better road grip on dry road and snow.

7 cl, 4 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Tire features tread asymmetric patter wherein ratio of actual area of contact to total area for zone 2o of outer side is larger than that for inner side zone 2i but with minor difference characteristic of water removal for right and left wheel tires. Said tire has tread surface 2 divided by four lengthwise grooves 3 and 4 into central area 5 of contact with soil, mid areas 6,6 of contact with soil and shoulder areas 7,7 of contact with soil. Said mid area 6o and shoulder area 7o in outer side zone 2o are divided by outer mid transverse grooves 8o and outer shoulder transverse grooves 10o into blocks 9o and blocks 11o. Mid transverse grooves 8o are inclined in opposite direction to inclination of shoulder transverse grooves 10o relative to tire axial direction while transverse grooves 8o and 10o are inclined at angle θmo of 5-45° and at angle θso over 0° and not over 40°, respectively.

EFFECT: better stability in rainy and dry weather.

8 cl, 6 dwg, 1 tbl

FIELD: transport.

SUBSTANCE: tread 2 has rounded shoulders and is divided by the main lengthwise grooves 3 and crosswise grooves 4 in blocks 5 furnished with pockets 6, each having zigzag part 8. Lengthwise grooves 3 include at least two axially outer lengthwise grooves 3o dividing the tread 2 into shoulders Ysh and crowns Ycr wherein zigzag part 8 of pockets 6sh in shoulders Ysh features larger zigzag amplitude Wsh and larger zigzag pitch Psh that zigzag amplitude Wcr and zigzag pitch Wcr of zigzag part 8 of pockets 6cr in crowns Ycr. Inclination angle θsh of pockets 6sh relative to axial direction is smaller than angle θcr.

EFFECT: improved flotation at dry road at minimum deterioration of performances on snow-covered road.

7 cl, 7 dwg, 1 tbl

Pneumatic tire // 2507083

FIELD: transport.

SUBSTANCE: invention relates to tread of tires to be used in winter equipped with antiskid studs. Proposed tire comprises tread with lengthwise blocks. Note here that said blocks comprises drilled blocks, each being provided with not-through hole to fit the stud therein. Said not-through hole is shifted towards the edge of drilled block. Raised not-through reinforcing part is made so that wall thickness (t) makes at least 5 mm for wall around said hole. Said blocks including drilled blocks feature identical geometry apart from said raised reinforcing part.

EFFECT: better run on ice and snow, sufficient life.

12 cl, 7 dwg, 1 tbl

Winter tire // 2482971

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to winter tire tread pattern. Proposed tire comprises tread with circular central region wherein blocks are located as symmetric pattern on opposite sides of circular equatorial plane of the tire. Said blocks located in symmetry on opposite sides of said central plane comprises multiple spaced apart and extending across wavy segments. Separate pairs of adjacent segments are connected by one or several circular grooves. Wavy segments comprise areas of variable depth and one or more deeper area and one or more areas not that deep. Aforesaid circular groove connecting the pair of adjacent wavy segments on opposite ends of the groove cross wavy segments in areas not deep.

EFFECT: better tread adhesion in winter.

15 cl, 11 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to winter tire tread pattern. Tread central area comprises reiterating circular row of first V-like recesses arranged at central plane. Note here that every V-like recess comprises first recess branches diverging in first circular direction and reiterating row of second V-like recesses at central plane and including second recess branches diverging in circular direction opposite the first one. Every said V-like recess is overlapped by multiple opposed second V-like recesses. Branches of first V-like recesses feature depth varying with length from 2 to 7 mm at top section of the branch at the center to branch end. Branches of first V-like recesses vary in width, like in length, from narrower top branches to wider medium branches and, further, to narrower end section so that branch volume per unit length does no vary.

EFFECT: better tread adhesion in winter.

18 cl, 11 dwg

Winter tire // 2482969

FIELD: process engineering.

SUBSTANCE: invention relates to automotive industry, namely, to winter tire tread pattern. Proposed tire comprises tread with circular central region wherein blocks are located as symmetric patter on opposite sides of circular equatorial plane of the tire. Tread comprises one or several circular recesses confined by edges of opposite blocks. Pair of two opposite block comprises block edge facing said recess and row of tenons formed along the edges of opposite blocks facing the recess and inclined radially. Tenons on the edge of one opposite block are inclined in direction opposite that on opposite block teeth inclination. Block on tread central zone recess side comprises multiple transverse pads spaced apart in circle toward lateral side. Said pads extend to line of teeth along block edge facing the recess and are leveled therewith.

EFFECT: better tread adhesion in winter.

10 cl, 10 dwg

Pneumatic tire // 2468931

FIELD: transport.

SUBSTANCE: invention relates to rodless tire tread pattern for motion on ice and snow. Tread surface has sections of contact with road cover composed of ribs divided by several main grooves, and/or multiple contact sections composed of blocks divided by grooves over tire width. Cutouts or minor openings are made on contact sections as well as multiple ledges with height smaller than depth of said cutouts. Note here that ledges are arranged to make the pattern whereby water drain channel width increases at crossing of water drain channels while water drain channels arranged in the form of mesh between ledges converge in smaller direction of the three directions. Relationship between area of multiple ledges and that of road contact surface (block-shaped) makes 0.5 or larger and 0.9 or smaller.

EFFECT: higher safety and reliability in motion on rod and ice.

5 cl, 5 dwg, 1 tbl

Pneumatic tire // 2466032

FIELD: transport.

SUBSTANCE: invention relates to automotive industry. Direction of tire rotation is set in pneumatic tire. Multiple narrow grooves are made in tire parts that stay in contact with soil. Each said narrow groove is shaped to, in fact, zigzag line composed of the chain of, in fact, V-like tread sections. Lowerable magnitude of tire parts that stay in contact with soil in direction of tire rotation differs from that of said parts in reverse direction, that is, against external force generated when tires lowers onto soil. Besides, direction of V-parts of every narrow section is set to make said lowerable magnitude of tire parts that stay in contact with soil in direction of tire rotation is smaller than that of said parts in reverse direction.

EFFECT: improved braking properties.

5 cl, 6 dwg, 1 tbl

FIELD: transport.

SUBSTANCE: tire has tread (1) including at least one groove (3) of circular orientation and multiple raised elements (21, 22). Note here that every said raised element comprises contact side (11) with crosswise width Lt and lateral walls (210). Note also that there is at least one raised element with multiple noise killing devices. Note that every said device has elongated cavity (4) of total volume Vc to open toward lateral wall (210). Note that said cavity features total length Lc larger than said length Lt and geometry that includes several interconnected parts (40, 41, 42, 43, 44, 45). Note also that length Lc makes the sum of parts of said cavity. Note that every said cavity (4) extends over the entire length Lc with notch (5) extending radially outward out to rolling surface. Note that sum tread sum Ly of lengths in projection in crosswise direction of every cavity is at least 1.5 times larger than the sum Lx of length in projection if the cavity circumferential direction.

EFFECT: perfected noise killing.

9 cl, 8 dwg

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