Pneumatic tire with slitted drain grooves

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

 

The present invention relates to a pneumatic tire suitable as neshipovannyh tires and, more particularly to a pneumatic tire having a good driving stability on a dry road surface, while maintaining minimum performance on a snowy road.

Pneumatic tires are designed for driving on icy and snowy roads, including, for example, studless, usually provided on the tread surface of the longitudinal grooves, passing in the longitudinal direction of the tire and lateral grooves, passing in the direction crossing with the longitudinal grooves, with the formation of blocks, which are further provided with zigzag slats, as it is known, for example, from JP-A-11-310013 and JP-A-2005-041393. Characteristics on snow-covered road (hereinafter called "the characteristics of the snow") by the action of shear forces snow columns, which are formed in the grooves, and boundary effects arising from the edges of the blocks and slats.

It is known that to obtain good performance on snow, it is preferable to increase the volume of the grooves, thereby increasing the power shift snow columns, and to increase the number of blades, thereby increasing the edge effect.

However, increasing the volume of the grooves and the increase in the number of lamellae leads to decrease in W is strasti blocks, thus leading to the deterioration of driving stability on a dry road surface (hereinafter referred to as "driving stability on a dry floor"). Characteristics on snow and driving stability on a dry floor are the characteristics, contradictory, and therefore, it is difficult to simultaneously maintain both characteristics at a high level.

Accordingly, the present invention is the provision of a pneumatic tire suitable for driving on icy and snowy road and, moreover, the driving stability on a dry floor which improved while maintaining minimum performance on snow.

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

The applicants of the present invention investigated neshipovannyh bus, in particular the amplitude and the step slats zigzag shape. Thus, it was found that (1) if the amplitude and pitch of the zigzag large, engages the opposite zigzag walls of the lamellae is stable, and therefore the rigidity of the block is relatively increased, and if the amplitude and pitch of the zigzag small, the rigidity of the block decreases, and (2)as shown in Fig.7. if the protector "and" the bus is divided by a pair of axially outer longitudinal main grooves "b" on the shoulder area A1 and the area "A2" crown area "A2" of the crown, is within a larger area of contact with the ground, have a greater effect on the movement on snow-covered road and shoulder area "A1", which strongly influences shear force during movement in turn, have a greater impact on the characteristics of movement at the turn on dry pavement. 7 the symbol "f1" denotes the area of contact with the ground bus in straight-line motion along a snowy road, and the symbol "f2" denotes the area of contact with the ground bus in motion on the turn on a dry road surface. Further discovered that the resistance of the transverse force acting during the movement of the rotation and the change of range of motion, can be effectively increased while maintaining efficient performance capture snow and pushing snow that improves the driving stability on a dry road surface with minimal degradation of performance on a snowy road by placing zigzag sipes with small amplitude and a small step in the area "A2" of the crown, providing a greater impact on traffic on snowy roads, and placement of zigzag sipes with a large amplitude and a large step in the shoulder areas "A1", providing a greater influence on the characteristics of movement at the turn on a dry road surface. Thus, the present invention is characterized by the difference of the amplitude of the zigzag sipes, step zigzag and angle u is the position of the slats in the shoulder area and the area of the crown.

In accordance with the present invention provides a pneumatic tire comprising a tread provided with a longitudinal main grooves passing continuously in the longitudinal direction of the tire and including a pair of axially outer longitudinal grooves, the transverse grooves, passing in the direction crossing with the longitudinal main grooves to separate the tread blocks and sipes provided in blocks

the protector has a shoulder zones, each of which includes a region of ground contact of the tread and has a rounded shape of the shoulder, so that the profile line in the meridional section of the tire includes a curve in the form of an arc of a circle with a radius of curvature of at least 25 mm,

moreover, a pair of axially outer longitudinal grooves divides the tread shoulder zone located axially outside the outer longitudinal grooves, and the area of the crown that is located between the outer longitudinal grooves,

each of the slats has a zigzag part, passing in the direction of the length of the lamella in the form of a zigzag,

the slats include slats, located in the shoulder areas, and the slats are located in the area of the crown, where the zigzag part of the blades, located in the shoulder areas, has a large amplitude Wsh and more step Psh than the amplitude of the Wcr and step Pcr zigzag part of the blades, located in the zones of the crown, and slats, located in the shoulder areas, tilted at an angle Θsh relative to the axial direction of the tire, which is less than the angle Θr relative to the axial direction of the slats, located in the area of the crown.

Preferably, the ratio of the WshA/Vcr is from 1.2 to 2.0 and the ratio Psh/Pcr is from 1.2 to 3.0. Preferably, the angle Θsh is 30° or less, and the angle Θ is from 15 to 60°.

Longitudinal main grooves may additionally include at least one internal longitudinal groove located in the area of the crown. In the preferred embodiment of the longitudinal main grooves include two internal longitudinal grooves located in the zone of the crown, for the separation zone of the crown on the internal zone of the crown, located between the inner longitudinal grooves, and an outer zone of the crown, located between each of the inner longitudinal groove and each outer longitudinal groove, and the direction of inclination of the blades, located in the inner zone of the crown, opposite to the direction of inclination of the blades, located on the outer zones of the crown relative to the axial direction of the tire.

Slats with small amplitude and small-step zigzag are used to reduce the rigidity of the blocks, so the blocks can be deformed during contact with the road surface, improving the characteristics of the capture snow and wet is Livonia snow. As such deformable blocks provided in the zone of the crown, having a great influence on the movement on snow-covered road, a pneumatic tire according to the present invention has an effective performance capture snow and pushing snow to effectively improve the performance on snow. On the other hand, as the slats are located in the shoulder areas, have a large amplitude and a large step zigzag, the rigidity of the blocks in the shoulder areas is increased, which provides a high resistance to the effects of shear forces during movement on the turn or the lane change movement, and therefore, improved driving stability on a dry road surface with improved characteristics in the snow thanks to the slats with small amplitude and pitch in the zone of the crown.

The terms "edge of the ground contact protector" or "edge of the ground contact", as used here, means axially outer edge of the surface of the ground contact of the tread which comes into contact with the ground (flat surface) at an angle of camber 0°, assuming that the tire is mounted on a standard rim, inflate to normal internal pressure and a tire under normal internal pressure then load standard load. The term "standard rim", as used here, means the rim is defined for the AC is in each bus in the system of standardization, on which is based the tire, 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 tires) 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 listed in the table "Within loads of tyres at different pressures of the cold pumping system TRA, and "inflation pressure" in ETRTO, in the case of tires for passenger cars, the "normal internal pressure" is kA. Moreover, the term "standard load" means a load defined for each bus in the system of standardization, and means, for example, "maximum load capacity" in the system JATMA, the maximum value indicated in the table "Within loads of tyres at different pressures of the cold pumping" in TRA, and the "load capacity" in ETRTO.

BRIEF DESCRIPTION of DRAWINGS

Figure 1 shows the line profile of the tread of the pneumatic tire in accordance with the present invention along the meridional section of the tire.

Figure 2 presents a detailed view of the picture protector is a pneumatic tire in accordance with the present invention.

Figure 3 presents a top view showing the block located in the shoulder area.

Figure 4 presents a top view showing the block located in the external zone of the crown.

Figure 5 presents a top view showing the block located in the inner zone of the crown.

Figure 6 presents an enlarged view showing the lamella that is located in the shoulder area.

Figure 7 presents a view schematically showing the contact area with the ground when driving on snow-covered road and the area of contact with the ground when driving in rotation on a dry road surface.

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

Figure 1 shows the line profile of the tread 2 of the pneumatic tire 1 in accordance with the present invention along the meridional section of the tire. As shown in figure 1, the pneumatic tire 1 in this embodiment has a rounded shape of the shoulder, so that the profile line of the shoulder SH of the tire, including the edge of The bottom contact of the protector includes a curve in the form of an arc of a circle with a radius of curvature of 25 mm or more. In the case of tires with such a rounded shape at the shoulder area Sho, located axially on the outside edges of The contact with the ground, which is the outer edge relative to the center of rotation, can come in contact with the ground, when the cross the sludge affects the tyre when moving bus on the turn. Therefore, the contact area with the ground can be increased in comparison with tires having a square shoulder or conical shape of the shoulder, thereby can be provided with high lateral reaction wheels. Rounded shape of the shoulder is important for the effects of the present invention. In figure 1 the symbol "" denotes the equator of the tire.

Figure 2 presents an example of the tread pattern, suitable for pneumatic tires 1 according to the present invention when it is used as neshipovannyh tires for passenger cars. Pneumatic tire 1 includes a tread 2, a longitudinal main grooves 3 (3i, 3o)passing continuously in the longitudinal direction of the tire and lateral grooves 4 (4o, 4m, 4C), passing in the direction of restraint longitudinal main grooves 3, so that the protector 2 is divided into blocks of 5 (5o, 5m, 5C) with the formation of checkerboard pattern.

Longitudinal main grooves 3 include at least a pair of axially outer longitudinal grooves 3o separating the protector 2 on shoulder area Ysh located axially outside the outer longitudinal grooves 3o and the area Ycr crown, located between the outer longitudinal main groove 3o, 3o.

Longitudinal main grooves 3 can optionally include one or more internal longitudinal grooves, located in the area Ycr crown. In the embodiment represented in figure 2, longitudinal main grooves 3 include four longitudinal grooves including a pair of internal longitudinal grooves 3i passing on both sides of the equator With the tire, and a pair of outer longitudinal grooves 3o located axially outside the inner longitudinal grooves 3i. Internal longitudinal grooves 3i are located in the area Ycr crown, dividing the area Ycr crown on the internal zone Ycr1 crown, located between the inner longitudinal grooves 3i, 3i, and an outer zone Ycr2 crown, located between the inner longitudinal grooves 3i and external longitudinal grooves 3o.

Transverse grooves include a Central transverse grooves 4C, located in the inner zone Ycr1 crown and forming a number of Central units 5C, placed in a certain order in the longitudinal direction of the bus, middle lateral grooves 4m, located in each outer zone Ycr2 crown and forming a number of secondary units 5m, placed in a certain order in the longitudinal direction of the tire and lateral grooves 4o, located in the shoulder area Ysh and forming a number of external units 5o, placed in a certain order in the longitudinal direction of the tire.

Longitudinal main grooves 3 are a wide groove width Wg of at least 3 mm and can be held in the longitudinal direction in the form of a straight line, in the form of a zigzag, in fo the IU waves or the like Straight grooves, the edges of which are formed by the walls of the grooves and the surface of the tread and are in a straight line in the longitudinal direction, are preferred from the viewpoint of durability. From the point of view of the characteristics of the buoyancy of water and the formation of shear strength of snow bars most preferably, the longitudinal main grooves 3 was a straight groove with a constant cross-sectional shape and held in longitudinal direction.

The depth Dg of the groove (not shown) of the longitudinal main grooves 3 are not limited in a particular way, but when the pneumatic tire of the present invention is made as neshipovannyh tire for passenger cars, the depth Dg of the groove is usually from 8.0 to 10.0 mm

Width Wy and depth Dy (not shown) of the transverse grooves 4 of the present invention can be similar to the width and depth of the transverse grooves, used in traditional nelipovich tires. In General, the width Wy and depth Dy of the transverse grooves 4 are the same or less than the width Wg and the depth Dg of the longitudinal grooves 3.

Lamella or lamellae 6 are formed on the surface of each block 5. Each slat 6 contains at least zigzag part 8, held in the form of a zigzag in the direction of the length of the slats, and can only consist of zigzag part 8, or may additionally VK is ucati linear part or parts, coming from one or both ends of the zigzag part 8 in the direction along the length of the slats. The linear part can be slightly curved. The width and depth of the slats according to the present invention can be similar to the width and depth of the slats used in traditional nelipovich tires. In this embodiment the slats 6 have a width of approximately 0.5 mm and a maximum depth of approximately 4,0 mm

In the pneumatic tire 1 according to the present invention the slats 6 include slats 6sh, located in the shoulder area Ysh, and slats 6cr located in the area Ycr crown, other than slats 6sh. More specifically, as shown in Fig.3-5, showing the external unit 5 C, the average unit 5m and the Central unit 5C, respectively, the slats 6sh formed on the outer blocks 5o, and slats 6cr formed on the medium 5m units and Central units 5C. In the present invention the slats 6sh and 6cr formed so that the zigzag part 8 blades 6sh, located in the shoulder areas Ysh, has a large amplitude Wsh and more step Psh than the amplitude of the Wcr and step Pcr zigzag part 8 blades 6cr, located in the area Ycr crown, i.e. Wsh>Wcr and Psh>Pcr.

Lamella with small amplitude of the zigzag and a small step zigzag (which hereinafter may be called "the lamella with a small zigzag") is used to reduce the rigidity of the blocks, as it engages the opposite zigzag the walls of the lamella surface, and adhesive force between the wall slats weak. As a result, the blocks are capable of deformation when the tread surface comes into contact with the ground, which improves the characteristics of the capture of the snow and pushing snow. The present invention features on snow effectively improved due to the location of zigzag sipes 6cr in the area Ycr crown, which has a great influence when driving on snowy roads. On the other hand, the lamella with a large amplitude and a big step zigzag (which hereinafter may be called "the lamella with a large zigzag") serves to increase the rigidity of the block, as it engages the opposite wall slats deep or strong, and the adhesive force between the wall slats big. Therefore, a high resistance to lateral force acting in the course of the movement on the turn or the lane change movement can be achieved by the arrangement of zigzag sipes 6sh in the shoulder area Ysh, having a great influence on the driving stability on a dry road surface. Thus, in combination with the formation of lamellae 6cr with a small zigzag in the area Ycr crown, the driving stability on a dry coating can be improved by improving the performance on snow.

If the relation Wsh / Wcr amplitude Wsh zigzag sipes 6sh to the amplitude of the Wcr zigzag sipes 6cr is less than 1.20 and if Rel is the solution Psh/Pcr step Psh zigzag sipes 6sh to step Pcr zigzag sipes 6cr is less than 1.20, differences in the size of the zigzag too small, thus, the above effects cannot be achieved sufficiently. On the other hand, if the ratio Wsh/Wcr is more than 2.0, and if the ratio Psh/Pcr is more than 3.0, the adverse effect of the slats 6cr with a small zigzag, located in the area Ycr crown, the driving stability on a dry floor and adverse action slats 6sh with a large zigzag located in the shoulder area Ysh, on the characteristics of the snow increases, thus, the above-mentioned effects of the invention cannot be achieved sufficiently. Therefore, it is preferable that the ratio Wsh/Wcr was at least 1,20, in particular, at least 1,40, and not more than 2.0, in particular not more than 1.8. Moreover, it is preferable that the ratio Psh/Pcr was at least 1,20, in particular, at least 1,40, and not more than 3.0, in particular, not more than 2.5.

As shown in Fig.3-5, the slats 6 are arranged so that the angle Θsh slats 6sh, located in the shoulder area Ysh, relative to the axial direction of the tire is smaller than the angle Θr slats 6cr, located in the area Ycr crown, relative to the axial direction. The reason is that to ensure great resistance to lateral force when driving on the turn or the lane change magic cube MOV is I, and thereby improve the driving stability on a dry floor, it is important to increase the rigidity of the blocks of the shoulder zones Ysh in the axial direction of the tire. On the other hand, as the angle Θcr slats 6cr, located in the area Ycr crown, relatively more marginal elements in the axial and longitudinal directions of the tire can be increased to improve the adhesion characteristics of the tire with the road not only on snowy roads, but also on the road with low resistance to friction µ, particularly on icy roads.

It is preferable to achieve such effects, to the angle Θsh slats 6sh was 30° or less. Also preferably, the angle Θr slats 6cr ranged from 15 to 60°. If the angle Θsh is more than 30°, the driving stability on a dry coating may decrease. If the angle Θcr is outside the above range, it becomes difficult to improve the adhesion characteristics of the tyre with a road with low µ. From this point of view is more preferable that the angle Θsh was not more than 20°, and the angle of inclination Θr was at least 20° and 40°.

The term "corners Θsh and Θcr tilt of the slats 6 relative to the axial direction" means the angle of the center line "i" of the amplitude of the zigzag shape of the zigzag part 8 relative to the axial direction of the tire. In the case when the center of the other line "i" zigzag represents a curve, corners Θsh and Θcr tilt is determined by the angle of the tangent to the curve "i" relative to the axial direction.

In the preferred embodiment, as shown in the drawings, the slats 6cr located in the area Ycr crown shape so that the direction of inclination of the slats 6cr1, located in the inner zone Ycr1 crown (shown in Figure 5), was opposite to the direction of inclination of the slats 6cr2 located in the outer zones Ycr crown (shown in Figure 4) relative to the axial direction of the tire. More specifically, the slats 6cr1 inclined downwards from the top left edge to the bottom right edge, and the slats 6cr2 tilted up from the lower left corner to the upper right edge. From the point of view of prevention of occurrence of drifts, it is preferable that the difference between "Θcr1 - Θcr2 between angle Θcr1 slats 6cr1 and angle Θcr2 slats 6cr2 was 15° or less. Figs.4 and 5, the angle Θcr1 about the same as the angle of Θcr2.

In addition, preferably the slats 6sh, located in the shoulder area Ysh. formed so that the direction of the slope of the center line "i" zigzag zigzag part 8 relative to the axial direction is the same as the direction of inclination relative to the axial direction of the outer lateral grooves 4o located in the shoulder area Ysh. In the embodiment represented in figure 3, the Central line "i" zigzag sipes sh and external transverse groove 4o tilted up from the lower left corner to the upper right edge. In particular, in the present example, the Central line "i" zigzag sipes 6sh and external transverse groove 4o are approximately parallel to each other, thereby it is possible to minimize the lowering of the rigidity of the blocks. Also preferably, as shown in Fig.6 in the enlarged view, the zigzag part 8 slats 6sh has a sawtooth shape, so alternate the first side 8A of the zigzag, intersecting with the center line "i" zigzag at a large angle α, and the second side 8b of the zigzag, intersecting with the center line "i" zigzag at a smaller angle α, where the direction of the slope of the first part 8A of the zigzag relative to the axial direction opposite to the direction of inclination of the center line "i" zigzag relative to the axial direction, and the direction of inclination of the second side 8b of the zigzag relative to the axial direction is the same as the tilt direction of the Central the line "i" zigzag relative to the axial direction. In the embodiment represented in figure 3, the Central line "i" zigzag and second side 8b of the zigzag sloping up from left to right, and the first side 8A of the zigzag slopes downward from left to right. If the zigzag part 8 blades 6sh has such a shape, the alignment component of the axial edges of the first sides 8A zigzag component and the axial edge of the second sides 8b zigzag and alignment costal is the fact that the longitudinal edges of the first sides 8A zigzag component and the longitudinal edges of the second sides 8b zigzag can be achieved by tilting the center line "i" zigzag relative to the axial direction of the jigsaw, in particular, with the center line "i" zigzag and external transverse groove 4o parallel to each other, thus edge effects can be balanced, which will improve the characteristics of the rectilinear motion while maintaining the rigidity of the blocks in the shoulder areas Ysh at a high level.

On the other hand, the slats 6cr1 and 6cr2 located in the inner and outer zones Ycr1 and Ycr2, crown formed so that the Central line "i" zigzag zigzag part 8 is inclined in a direction relative to the axial direction of the tire opposite to the direction of inclination of the transverse grooves 4C and 4m, located in the inner and outer zones Ycr1 and Ycr2 crown. In the embodiment represented in the drawings, the Central line "i" zigzag sipes 6 cr1 in the inner zone Ycr1 crown slopes downward from left to right, and transverse grooves 4 in the inner zone Ycr1 crown sloping up from left to right. Moreover, in the external zone Ycr2 crown Central line "i" zigzag sipes 6cr2 sloping up from left to right, and transverse grooves 4m slopes downward from left to right. In particular, it is preferable that the center line "i" zigzag sipes 6cr1 overlap with the transverse grooves 4C at an angle of at least 30°, and the Central line "i" zigzag the slats 6cr2 overlap with the transverse grooves 4m at an angle of at least 30°. Such arrangement of the lamellas 6cr1 and 6cr2 gives an advantage in terms of features on snow, as the rigidity of the blocks area Ycr crown can be reduced to a reasonable value.

As shown in Figure 5, an inner lateral grooves 4C used in this embodiment are approximately V-shaped curved grooves such that the first portion 4C1 with gentle slope and the second part 4C2 with steep slope connected at the point Q of the curve, and the adjacent transverse grooves 4C, 4C are connected to each other through the connecting grooves 10, each of which extends from a point Q of the curve, namely comes out of the end of the first part 4C1 from point Q up to the middle part (send part) 4C2 adjacent inner lateral grooves 4C, which further improves the characteristics of the buoyancy of water and the characteristics of the snow. The first and second parts 4C1 and 4C2 inner lateral grooves 4C and a coupling groove 10 can be rectilinear grooves or slightly curved grooves. In the embodiment represented in the drawings, the connecting groove 10 and the second part 4C2 inner lateral grooves 4C gradually merge into each other, forming one arc groove that improves the characteristics of the buoyancy of the water at the equator of the tire where high characteristics of the buoyancy of the water.

Pneumatic tire according to the present image is meniu preferably has an asymmetric tread pattern, where the drawings on both sides of the equator With different tires, as shown in figure 2. Pneumatic tire according to the embodiment represented in the drawings, has an asymmetric tread pattern, in which the outer half 2o tread 2, which is located on the outer side of the vehicle relative to the equator From the tire when the tire is installed on the vehicle, is related Lo the actual contact area with the ground to the total area greater than the ratio of Li to the actual contact area with the ground to the total area of the inner half 2i tread 2, which is located on the inner side of the vehicle relative to the equator of the tire, if the tire is installed on the vehicle. As Lo the outer half 2o, which has a large load during movement on the turn, increased, increasing the rigidity of the figure, the driving stability on a dry coating can be further improved while maintaining the excellent aforementioned characteristics on snow. Preferably, the ratio of the external Lo half 2o ranged from 63,5 to 69.5 per cent, and the ratio of Li inner half 2i ranged from 59,5 to 65.5%. Moreover, from the point of view of the characteristics of the snow, driving stability on a dry floor and uneven wear resistance, it is preferable that the difference between "Lo-Li" relations between o and Li ranged from 2.0 to 5.0%. As is well known, the term "ratio of actual contact area with the ground to the total area"used herein means the ratio of the surface area of contact with the ground (the total area of the surfaces of the blocks) to the total area of the tread surface 2 between the two edges of Those, The bottom contact of the tread (including the area of all of the grooves), namely to the entire surface area of the tread 2 in the state where all of the grooves are filled.

In the present embodiment, each of the transverse grooves 4m and 4C, located in the area Ycr1 crown contains at both axial ends of the sections of K-crossing, in which the transverse groove intersects with the longitudinal grooves 3, as shown in Figure 4 and 5. Width Wyo each of the transverse grooves 4m and 4C on the outer areas To the intersection, located on the outer side of the vehicle when the tire is installed on the vehicle, provide less than the width Wyi each of the transverse grooves 4m and 4C on internal sites Ki crossing, located on the inner side of the vehicle when the tire is installed on the vehicle. Since the width of Wyo and Wyi transverse grooves 4m and 4C at both axial ends set in the ratio Wyo<Wyi, the rigidity of the figure may be increased toward the outer side of the vehicle, thereby stabilisatoren on a dry coverage improves, in conjunction with providing the ratio Lo<Li. Preferably, the width Wy of each of the transverse grooves 4m and 4C increases continuously and/or stepwise from the outer area To the intersection of the inner plot Ki crossing.

While the preferred embodiment of the present invention is described with reference to the drawings, it should be understood that this invention is not limited to this embodiment and can be made a variety of changes and modifications.

The present invention is more specifically described and explained by means of the following examples. It should be understood that the present invention is not limited to these examples.

EXAMPLES

Studless tires for passenger cars the size of 205/55R16 and the main tread pattern presented in figure 1 was produced in accordance with the specifications shown in table 1, and tested on the driving stability on a dry floor and features on snow-covered road. Technical characteristics of the tire, except for the amplitude and pitch of the zigzag part of the respective slats were essentially common to all tires. The results are presented in table 1.

Test methods described below.

(1) the driving Stability on a dry floor

Tires were mounted on all wheels of the vehicle, and the car felt on the course is spitoni on a dry asphalt road. The driving stability (stability when changing range of motion and in motion on the rotation) was assessed by the sensations of the driver. The results are presented in the form of the metric, based on the result for comparative example 1 taken as 100. The higher the ratio, the better the driving stability of the tire on a dry road surface.

Rim size: 16×6,5J

Internal pressure: 200 kPa

Vehicle: car of 2000 cc FR

(2) Characteristics on snow

The above test vehicle was tested on a snowy road. The driving stability was assessed by the sensations of the driver. The results are presented in the form of the metric, based on the result for comparative example 1 taken as 100. The higher the index, the better the performance on snow.

Table 1
Cf. note 1Cf. 2Cf. PrimExample 1Example 2Example 3Example 4Example 5
The lamella in the area of the crown
The amplitude of the Wcr zigzag (mm)1,41,81,81,41,41,41,41,4
Step Pcr zigzag (mm)3,04,04,03,03,03,03,03,0
The lamella in the shoulder areas
The amplitude of the Wsh zigzag (mm)1.41,81,41,82,12,81,72,8
Sha is Psh zigzag (mm) 3,04,03,04,04,56,03,69,0
Attitude Wsh/Wcr1,01,00,781,31,52,01,22,0
The ratio Psh/Pcr1,01,00,751,31,52,01,23,0
The driving stability on a dry floor
Change range of motion100110100110115115108118
Movement at the turn100110100110115115108118
Characteristics on snow
Change range of motion100100100105989510595
Movement at the turn100100100 105989510595

1. A pneumatic tire comprising a tread provided with a longitudinal main grooves passing continuously in the longitudinal direction of the tire and including a pair of axially outer longitudinal grooves, the transverse grooves, passing in the direction crossing with the longitudinal main grooves for separation of the tread blocks and sipes provided in blocks
specified protector has a shoulder zones, each of which includes a region of ground contact of the tread and has a rounded shape of the shoulder, so that the profile line in the meridional section of the tire includes a curve in the form of an arc of a circle with a radius of curvature of at least 25 mm
the specified pair of axially outer longitudinal grooves divides the tread shoulder zone located axially outside said external longitudinal grooves, and the area of the crown that is located between the outer longitudinal grooves,
each of the slats has a zigzag part, passing in the direction of the length of the lamella in the form of a zigzag,
these slats include fins located in said shoulder areas, and the slats are located in a specified area of the crown, where this zigzag part ka the DOI of these blades, facilities in the shoulder areas, has a large amplitude Wsh and more step Psh than the amplitude of the Wcr and step Pcr zigzag of each of these slats located in a specified area of the crown, and these slats are located in these shoulder areas, tilted at an angle Θsh relative to the axial direction of the tire, which is less than the angle Θr relative to the axial direction of these slats located in a specified area of the crown.

2. Pneumatic tire according to claim 1, in which the ratio Wsh/Wcr specified amplitude Wsh zigzag part of the blades, located in the mentioned shoulder areas, to the specified amplitude Wcr zigzag part of the blades, located in a specified area of crown range from 1.2 to 2.0, and the ratio Psh / Pcr specified step Psh zigzag part of the blades, located in the mentioned shoulder areas, to the specified step Pcr slats located in a specified area of the crown, is from 1.2 to 3.0,

3. Pneumatic tire according to claim 1, in which the specified angle Θsh slats located in the mentioned shoulder areas is 30° or less, and the specified angle Θr slats located in a specified area of crown range from 15 to 60°.

4. Pneumatic tire according to claim 1, in which the mentioned longitudinal main grooves include two internal longitudinal grooves located the specified area of the crown, dividing the specified area of the crown on the internal zone of the crown, located between the said internal longitudinal grooves, and an outer zone of the crown, located between each of the specified internal longitudinal groove and each of the specified external longitudinal groove, and the direction of inclination of the blades, located in the inner zone of the crown, opposite to the direction of the slats located in these outer zones of the crown relative to the axial direction of the tire.

5. Pneumatic tire according to claim 1, in which the said slats, located in the specified shoulder area formed so that the direction of the slope of the center line of the zigzag zigzag part of the slat relative to the axial direction is the same as the direction of inclination relative to the axial direction of the transverse grooves are in a particular shoulder area, and zigzag portion has a sawtooth shape, so alternate the first side (8A) of the zigzag, intersecting with the Central line (i) zigzag at a large angle α, and the second side (8b) zigzag, intersecting with the Central line (i) zigzag at a smaller angle α, where the direction of the slope of the first part (8A) of the zigzag relative to the axial direction opposite to the direction of inclination of the Central line (i) zigzag relative to the axial direction, and the direction of inclination of the second the second part (8b) of the zigzag relative to the axial direction of the same, as the tilt direction of the Central line (i) zigzag relative to the axial direction.

6. Pneumatic tire according to claim 1, in which the outer half of the specified tread, which is located on the outer side of the vehicle relative to the equator of the tire, when the tire is installed on the vehicle, is related Lo the actual contact area with the ground to the total area greater than the ratio of Li to the actual contact area with the ground to the total area of the inner half of the specified tread, which is located on the inner side of the vehicle relative to the equator of the tire, when the tire is installed on the vehicle.

7. Pneumatic tire according to claim 1, in which each transverse groove located in a specified area of crown contains at both axial ends of the intersections where the transverse groove intersects with the specified longitudinal grooves, and the width Wyo each specified longitudinal grooves on the outer area of the crossing, located on the outer side of the vehicle when the tire is installed on the vehicle, is less than the width Wyi each specified transverse grooves on the inner intersection, located on the inner side of the vehicle when the tire is installed on the vehicle.



 

Same patents:

Air tire (versions) // 2506171

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern of stud-free tire. One block of air tire has first and second slitted drain grooves. Every said groove extends in tire width direction. Said grooves are regularly spaced apart in tire circumference. First and second said grooves has first parts of slitted rain groove that features linear shape if seen in the plane. The slitted drain groove second part that features zigzag shape if seen in the plane and is connected with slitted drain groove first part. First part of slitted drain groove has two surfaces of slitted and opposed drain groove walls if seen in direction perpendicular to the length of said slitted drain groove. Said first part comprises the ledge arranged on first surface of said walls and recess arranged second surface of said walls to make recess connected with ledge.

EFFECT: better running on ice and snow.

20 cl, 20 dwg, 1 tbl

Pneumatic tire // 2506170

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern of stud-free tire. Proposed tire comprises sets of blocks G composed of polygonal blocks 10 arranged tightly in crown zone 1. Polygonal blocks 10 are confined by grooves 9 including first grooves 9a of W9a width and arranged between polygonal blocks 10 adjoining in tore circular direction. Width W9a of first grooves 9a is larger than width W9b of second grooves 9b located between polygonal blocks 10, adjoining and staggered.

EFFECT: better flotation on ice and snow.

7 cl, 7 dwg, 4 tbl

Pneumatic tire // 2504483

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Proposed tread pattern comprises multiple screw transverse grooves with their open ends communicated with one of two circular grooves and their extremities terminate in tread section confined on sides by circular grooves. Every skew transverse groove extends from its open end in first direction in tire circumferential line. Tread patter includes also narrow grooves with their starting parts located in the midst of appropriate skew transverse grooves. Every narrow groove extends in second direction opposite the first one to terminate at tread section. Curved and straight parts are located between open end and extremity nearby each skew transverse groove. Said extremity relates to groove straight part extending in tire circumferential direction. Closed end of narrow groove is shifted in second direction in circumferential direction relative to extremity of skew transverse groove extending there along in second direction.

EFFECT: optimised tire performances at wet road coat, higher wear resistance.

18 cl, 10 tbl, 7 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to large truck tire tread. Tire has tread 1 with absolutely new running surface 10 with at least one running path 2 confined by sidewalls located opposite each other. This running part 2 opens discretely to running surface 10 by multiple parts 21 opened outward of the tread. Note here that said open parts 21 have two ends 212 extending under running surface by channels 22 having inlets 221, 222 connected with ends 212 of said open parts 21. Said inlets 221, 222 feature mean area S. Tread is made so that every part 21 opened to sunning surface has closer 4 at every its end to close cross-section of channel inlets 221, 222 in motion and keep passage open.

EFFECT: better braking performances.

10 cl, 10 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, particularly, to passenger car tire tread patters. Tire tread has grooves 2 directed in circle to confine sets of raised elements that make two edge rows. Edge rows have multiple transverse grooves of definite depth and confined by opposite walls. Multiple transverse grooves of one end row include at least one support block 5 extending from at least one wall to confine said groove. Every support block 5 has active surface 50 to contact with other surface in contact with soil surface. Tread features preset relationships for the sum of areas of active surfaces 50 at maximum length LM in crosswise direction of virtual convex surface surrounding all active surfaces of transverse groove. Besides, it has at least one fluid flow channel between every support block and groove bottom.

EFFECT: better operating performance on wet roads.

8 cl, 8 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Tread has H-deep grooves exposed at tread surface and confined by material surfaces spaced at least 2 mm apart. Multiple grooves 2 have at least one shaped ledge 6 at, at least one of said opposed surfaces. Said shaped ledge is confined by radially outward and radially inward surfaces. Said radially outward surface is located closer to tread surface 10 than radially inward surface. Inner and outer surfaces cross at points A1, A2 of the ledge distant from each other in groove direction. Note here that every of said surfaces of every ledge, radially inner and outer, features such profile in section parallel with confining surfaces that radially outward surface profile length is larger than that of radially inward surface.

EFFECT: better performances in rainy weather.

5 cl, 6 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, particularly, to tire tread with flexible device to decreased noises related with resonance of air flowing along tire grooves all over tire circumference. Tire tread 1 is made from rubber with Shore hardness of at least 65. Said tread has at least one groove of width W and depth D. Said groove 2 is confined by two opposite tread parts connected by groove bottom 21. tread comprises multiple closing membranes 4 formed in at least one groove 2. Every closing membrane 4 closed groove 2 at, at least, 50% of groove cross-section. Note here that every closing membrane 7 has mean thickness not over 2 mm and can bend at fluid passage. Closing membranes 4 are made of material with Shore hardness of not over 62. Note here that said hardness is smaller than that of the tread.

EFFECT: decreased resonance noises.

8 cl, 7 dwg

Pneumatic tire // 2489267

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Propose tire comprises side strips and tread section there between. Two peripheral zigzag-like main grooves extend along tire circle in every zone from tire axial line in tread region. First transverse grooves extend from main inner peripheral groove to pattern end. Second transverse grooves extend to pattern end from outer peripheral main groove. Inner peripheral main groove wall has surface with inclination varying in circle. Outer block located between main grooves has traverse cutout-like groove extending in tire width or from inner, or from outer main groove and closed within outer block. Depth of transverse cut-out groove is smaller than that of the first and second transverse grooves.

EFFECT: higher braking properties on snowy and wet pavement.

20 cl, 7 dwg, 1 tbl

Air tire // 2472634

FIELD: transport.

SUBSTANCE: invention relates to tread of tires to be used in winter. Block central side has two open grooves while closed grooves are made on both sides of tire open grooves in circumferential direction. Depth of open grooves makes 50-70% of the depth of first circumferential main groove while depth of closed groove makes 105-140% of open groove depth.

EFFECT: good performance on ice, rigidity of blocks.

7 cl, 2 dwg, 1 tbl

Pneumatic tire // 2471640

FIELD: transport.

SUBSTANCE: invention relates to tread pattern design for all-season motor tire. Tread surface (2) of pneumatic tire is provided with at least one main longitudinal groove (3) in outer area at outer side of vehicle. Longitudinal main groove (3) is straightline groove so that edge lines (21), where groove wall planes (20) intersect with tread surface (2) go rectilinearly in longitudinal direction. Each surface (20) of groove wall consists of upper part (20U) of wall surface and lower part (20L) of wall surface. Upper part (20U) of wall surface is slightly sloping and passes from edge line (21) at the θ1 angle of 40° to 60° relative to line perpendicular to tread surface (2). The lower part (20L) of wall surface is steeply sloping and passes up to bottom surface (22) at θ2 angle that is less than 91 angle. Each lower part (20L) of wall surface contains protrusions (23) located in longitudinal direction of tire. Each protrusion (23) has triangle cross-section with sloping surface (23 S) passing from lower end (Ue) of upper part (20U) of wall surface to bottom (22) of groove at θ3 angle which does not exceed angle 91 but is greater than angle 92.

EFFECT: better running characteristics on snow, increased traction power on snow-covered road surface while maintaining high-level coupling on dry road surface.

7 cl, 11 dwg, 1 tbl

Air tire (versions) // 2506171

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern of stud-free tire. One block of air tire has first and second slitted drain grooves. Every said groove extends in tire width direction. Said grooves are regularly spaced apart in tire circumference. First and second said grooves has first parts of slitted rain groove that features linear shape if seen in the plane. The slitted drain groove second part that features zigzag shape if seen in the plane and is connected with slitted drain groove first part. First part of slitted drain groove has two surfaces of slitted and opposed drain groove walls if seen in direction perpendicular to the length of said slitted drain groove. Said first part comprises the ledge arranged on first surface of said walls and recess arranged second surface of said walls to make recess connected with ledge.

EFFECT: better running on ice and snow.

20 cl, 20 dwg, 1 tbl

Pneumatic tire // 2506170

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern of stud-free tire. Proposed tire comprises sets of blocks G composed of polygonal blocks 10 arranged tightly in crown zone 1. Polygonal blocks 10 are confined by grooves 9 including first grooves 9a of W9a width and arranged between polygonal blocks 10 adjoining in tore circular direction. Width W9a of first grooves 9a is larger than width W9b of second grooves 9b located between polygonal blocks 10, adjoining and staggered.

EFFECT: better flotation on ice and snow.

7 cl, 7 dwg, 4 tbl

Pneumatic tire // 2504483

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Proposed tread pattern comprises multiple screw transverse grooves with their open ends communicated with one of two circular grooves and their extremities terminate in tread section confined on sides by circular grooves. Every skew transverse groove extends from its open end in first direction in tire circumferential line. Tread patter includes also narrow grooves with their starting parts located in the midst of appropriate skew transverse grooves. Every narrow groove extends in second direction opposite the first one to terminate at tread section. Curved and straight parts are located between open end and extremity nearby each skew transverse groove. Said extremity relates to groove straight part extending in tire circumferential direction. Closed end of narrow groove is shifted in second direction in circumferential direction relative to extremity of skew transverse groove extending there along in second direction.

EFFECT: optimised tire performances at wet road coat, higher wear resistance.

18 cl, 10 tbl, 7 dwg

Pneumatic tire // 2499680

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern of stud-free tire. Pneumatic tire has cutouts 6 extending over tire width and arranged spaced in direction along tire circumference, at least, in shoulder blocks 5a separated by lengthwise grooves extending in tire circumference and crosswise grooves 3 extending over tire width. Open cutouts 6a ad closed cutouts 6b are arranged in turns while depth of open cutouts 6a is smaller than that of closed cutouts 6b.

EFFECT: better running on icy roads, higher wear resistance.

7 cl, 5 dwg, 1 tbl

FIELD: transport.

SUBSTANCE: invention relates to design of slits in tire tread pattern. Treat layer has treat patter forming annular grooves and crosswise grooves while tread blocks 22 with slits are formed. At least some of said slits 27 in lengthwise direction feature wavy configuration. This allows making at least two main surfaces (272A, 272B) in said slit 27 arranged in line and shifted one relative to the other through preset distance C. Transition zone 272C is located between said main surfaces. Adjacent main surface 272A, 272B incorporated locking elements 28 made up of ledge 281 in one of walls of slit 27 and shaped to truncated cone while opposite wall 271 of said slit has recesses 282 of the same shape. Ledge 281 and recess 282 conjugate when walls 281 of aforesaid slit get pressed together. Invention covers appropriate tire tread and to means used in production of the tire.

EFFECT: improved grip.

9 cl, 11 dwg

Pneumatic tire // 2493972

FIELD: transport.

SUBSTANCE: invention relates to configuration of grooves on wheel winter tire tread. Pneumatic tire comprises blind groove 5 on the surface of contact with road surface and at least: three grooves 4 extending radially from hidden axis 2 extending downward from aforesaid contact surface. Expanded section 6 whereat groove width is locally expanded at, at least, one position in mid section between hidden axis 2 and end section 4z of grooves 4.

EFFECT: better braking on ice.

17 cl, 12 dwg, 1 tbl

Pneumatic tire // 2492063

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Tire tread has, at least, two sets of blocks GB1 to GB3, their density varying from 0.003 pc/mm2 to 0.04 pc/mm2. At least, one set of blocks Gb2 has block 4, its crosswise length BW2 exceeding its lengthwise length BL2.

EFFECT: better braking on ice.

6 cl, 16 dwg, 2 tbl

Pneumatic tire // 2489268

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Tire 1A comprises, at least, four lengthwise main grooves 21-24 and multiple rib-like parts 31-35 separated by said main grooves in tread region. Besides, area of outer secondary contact with pavement 32 comprises narrow zigzag groove 321 extending in lengthwise direction to separate outer secondary contact area in transverse direction of the tire. Also, it includes multiple first slits 322 arranged with preset spacing in tire lengthwise direction to extend from outer edge contact area 32 to inner transverse area, out of zigzag narrow groove 321, to keep vent spacing gap.

EFFECT: stable steering, reduced noise.

20 cl, 8 dwg, 4 tbl

Pneumatic tire // 2489267

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Propose tire comprises side strips and tread section there between. Two peripheral zigzag-like main grooves extend along tire circle in every zone from tire axial line in tread region. First transverse grooves extend from main inner peripheral groove to pattern end. Second transverse grooves extend to pattern end from outer peripheral main groove. Inner peripheral main groove wall has surface with inclination varying in circle. Outer block located between main grooves has traverse cutout-like groove extending in tire width or from inner, or from outer main groove and closed within outer block. Depth of transverse cut-out groove is smaller than that of the first and second transverse grooves.

EFFECT: higher braking properties on snowy and wet pavement.

20 cl, 7 dwg, 1 tbl

Pneumatic tire // 2482973

FIELD: transport.

SUBSTANCE: invention relates to automotive industry. Proposed tire comprises blind cutout 5 made in tread surface 1 and including minor hole arranged radially relative to tires, and three cuts 4 extending radially from said hole 2 to surface of contact with pavement 3. Said cuts 4 are made with spinning inside with center at small hole 2, angle of spinning from top to bottom surfaces of contact with pavement makes, at least, 3-10° but not over 135°. Besides, radial length of said cuts 4 or their width are larger on tread surface 1 than those on its bottom surface.

EFFECT: better braking on ice.

14 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

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