Pneumatic tire

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

 

SCOPE

The present invention relates to a pneumatic tire, which is neshipovannyh tire with improved performance on the ice in the initial period of operation of the bus.

The LEVEL of TECHNOLOGY

Proposed and implemented in the use of pneumatic tires, known as "studless"that have improved operational characteristics, such as braking performance on ice and sustainability steering in the snow, when driving on snowy and icy surfaces of the roadway.

In some nelipovich tire in the tread material is added which creates microscopic protrusions filler to achieve marginal effect on icy surfaces, and some tyre rubber are microscopic bubbles, creating the effect of absorbing water and edge effect.

However, as a rule, if containing such filler and/or bubbles rubber layer located on the surface of the tire in direct contact with the mold during vulcanization/curing of the rubber, the rubber layer will not be formed. For this reason, the above-mentioned filler and the bubbles are not present on the surface of the tread in the initial period of operation of the bus, and the effectiveness of such filler and/or bubbles in the initial the period is not shown, or, if there is, the degree of efficiency is small.

Therefore, as neshipovannyh pneumatic tires, are able to demonstrate high efficiency in the initial period of operation, proposed a pneumatic tire, the tread surface of which there are several lots of contact with the road surface, separated by several major grooves, and passing across the width of the tire at least one slot divides the said areas of contact on small plots - checkers. Next, each section of the contact has several small grooves with depth, the smaller the depth of the grooves that radiate from the center section of the contact in the direction of flow of water in the principal grooves to both edges and open to the main groove, and the exposed areas are then in the direction of flow in the main groove, and not in the Central part of the site of contact (patent document 1).

The objective of the present invention is the reinforcing effect of the exhaustion of the water and the edge effect by the removal or diversion of water through several narrow grooves formed in the same direction at an angle to the direction along the tire circumference, or through several narrow grooves formed in two intersecting directions. However, in many cases, the subject of this izaberete the Oia does not demonstrate sufficiently high efficiency removal of water due to the formation of the mentioned narrow grooves, and thus, it cannot be considered satisfactory.

PRIOR art

Patent documents

Patent document 1: unexamined patent application of Japan No. 2006-151229.

BRIEF description of the INVENTION

The problem, the solution of which is provided when using tires that are described in the present invention

In light of the above-mentioned problems, the present invention is the creation of neshipovannyh pneumatic tires, which demonstrates the high efficiency of absorbing water and edge effect when driving on icy and snow-covered surface of the roadway during the initial period of operation of the bus, and after the initial period also shows a high braking performance on ice and directional stability on snow when driving on icy and snow-covered surface of the roadway.

Solutions to PROBLEMS

Pneumatic tire in accordance with the present invention, which corresponds to the above purposes, has the following configuration.

1. A pneumatic tire having a tread surface areas of contact with the road surface in the form of ribs separated by several major grooves, and/or multiple areas of contact in the form of separate pieces, separated by grooves in the direction of the width of the tyre, is castco contact has slits or small holes, there are many protrusions, the height of which is less than the depth of the slits or small holes, and protrusions arranged to form a pattern in which the width of the channel for water flow increases at the point of confluence of the channels for water flow, and arranged in a grid between the projections channels for water to meet at least three directions, and the ratio of the area of many of the projections to the area of contact (checkers) with the road surface is 0.5 or more and 0.9 or less.

Pneumatic tire in accordance with the present invention preferably has one of the configurations described in paragraphs 2-5.

2. Pneumatic tire in accordance with paragraph 1, and the height of the protrusions is from 0.1 to 0.5 mm.

3. Pneumatic tire in accordance with paragraph 1 or 2, and the minimum distance between adjacent protrusions is from 0.2 to 1.0 mm

4. Pneumatic tire according to any one of paragraphs 1 to 3, and the surface area of contact of each of the protrusions with the road surface is from 0.03 to 20 mm2.

5. Pneumatic tire according to any one of paragraphs 1-4, and the site of contact of the protrusion with the road surface has an approximately round shape.

The results of the INVENTIONS

In the exemplary embodiment of the present invention to fit the accordance with paragraph 1 on the surface of the tread in the form of checkers, there are slits or small holes, and there are many protrusions, the height of which is less than the depth of the slits or small holes. Moreover, the protrusions arranged to form a pattern in which the width of the channel for water flow increases at the point of confluence of the channels for water flow, and arranged in a grid between the projections channels for water to meet at least three directions. Thus, it can be achieved high efficiency water exhaustion and edge effect when driving on icy and snow-covered surface of the roadway, even in the initial period of operation neshipovannyh pneumatic tyres. In addition, it is proposed configuration neshipovannyh pneumatic tire, in which, after the initial period of operation and even after the fall of the effectiveness of a variety of tabs available slots or small holes provide a high edge effect and high braking performance on ice, and directional stability on snow.

In embodiments of the pneumatic tire of the present invention in accordance with any of paragraphs 2-4 features a pneumatic tyre with more pronounced advantages in comparison with the characteristics shown in the embodiments of the pneumatic tire of the present invention in accordance with paragraph 1, opican the m above.

BRIEF DESCRIPTION of DRAWINGS

Figure 1 in a perspective view shows the site of contact of the tread with the road surface for a pneumatic tire in accordance with the present invention.

On figa-2C shows a top view of the location of many of the tabs on the areas of contact of the tread (checkers) with the road surface for a pneumatic tire in accordance with the present invention.

Figure 3 shows a view in section of the area of contact of the tread with the road surface for a pneumatic tire in accordance with the present invention.

DETAILED description of the INVENTION

Below is a detailed description of the pneumatic tire in accordance with the present invention with reference to the accompanying drawings.

As shown in figure 1 and figure 3, the pneumatic tire in accordance with the present invention has on the surface of the tread 1, the areas of contact with the road surface in the form of ribs 4, divided in several main grooves 2, and/or multiple areas of contact in the form of a separate checkers 4, separated by grooves 3 across the width of the tire, the contact areas 4, there are slits or small holes 5, and there are many ledges 6, the height h which is less than the depth D of the slits or small holes 5. Moreover, the protrusions 6 are placed in such a way as to form a pattern in which the width of the channel for a hundred the and water (w 1, w2, w3and w4on figa) increases at the point of confluence of the channels for water flow 7, and arranged in a grid between the projections 6 channels for water to meet at least three directions.

Further, the ratio of the area of many of the projections to the area of contact (checkers) with the road surface is 0.5 or more and 0.9 or less.

In embodiments of the present invention the channels for water flow for a long time does not become clogged with snow, as the width of the channel for water flow (w1, w2, w3and w4on figa) increases at the point of confluence of the channels for water flow 7, the channels for water to meet at least three directions. Moreover, the channels for the flow of water for a long time does not become clogged with snow, and the efficiency of the removal of the water is maintained at a high level, even when the tread blocks are compressed by contact with a road surface when driving, because the width of the channel for water drainage chosen to be sufficiently large at the point of confluence of the channels for water flow 7. This provides a very efficient water drainage, as well as compensation for lack of effectiveness of fillers in the material of the tread and layer with bubbles in the body of the tire during the initial period of operation due to the above factors. Thereby provide the SJ performance is excellent braking on ice and driving stability on snow.

It is important that many of the projections 6 are involved in the formation of the grid channels for water flow, as described above. In addition, it is important that the shape of the channels for water flow provides increased channel width (w1, w2, w3and w4on figa) at the point of confluence of the channels for water flow 7, and channels for water to meet at least three directions. It is particularly important that in the projection on top of the many ledges 6 form a pattern in the form of a circle, an ellipse, a polygon (triangle, quadrilateral, Pentagon, hexagon and so on) with rounded corners (vertices), or a pattern in the form of a hexagon, octagon, etc. without the rounded edges. In embodiments of the present invention is difficult to achieve the desired efficiency in the use of only the intersecting grooves in the form of strips (tapes) or intersecting inclined grooves, because it is impossible to obtain an increase in the width of the channels for water flow at the point of confluence of these channels.

After performing many tabs 6's function at the initial stage of operation tires and they wear a key role in ensuring the braking performance on ice and driving stability on snow goes to the slits or small holes. This purpose can be applied slits or small holes, used on a hundred is a standard nelipovich tires. The depth D of the slits or small holes 5 should exceed the height h of the many ledges 6, since the slits or small holes play a major role after the many ledges 6 of its functions at the initial stage of operation tires and wear them. As for the form of slits or small holes, slits preferably may have, for example, a wavy shape or form, changing when moving deeper into the tread (the so-called "volumetric slots"); and small holes can preferably have approximately the shape of a circle or polygon.

In addition, to maximize the use of multiple projections 6 the ratio of the area of many of the projections 6 to the area of contact (checkers) with the road surface should be 0.5 or more and 0.9 or less. If the ratio is less than 0.5 or higher than 0.9, the effective formation of channels for water flow at the site of contact is difficult. Preferably, the ratio of the area of many of the projections 6 to the area of contact (checkers) with the road surface was 0.6 or more and 0.8 or less, since at this ratio provides a more effective formation of channels for water flow at the site of contact.

In addition, the height of the protrusions 6 should preferably range from 0.1 to 0.5 m is. At the height of the protrusions is less than 0.1 mm, the depth of the channel for water flow will be insufficient, and to expect high performance water drainage will be impossible. At the height of the protrusions more than 0.5 mm reduced rigidity area of the tread that leads to a fall in performance tires and increase the danger of uneven tire wear due to deformation caused by contact with the road surface. From the point of view of maximum effectiveness, the height of many of the projections 6, more preferably should be from 0.20 to 0.35 mm

In addition, the minimum distance between adjacent protrusions 6 should preferably be from 0.2 to 1.0 mm, Having a distance between adjacent protrusions 6 which is less than 0.2 mm, it is undesirable because the width of the channel for water flow will be insufficient, and to expect high performance water drainage will be impossible. Moreover, it is not desirable that the distance between adjacent protrusions 6 was more than 1 mm, since this reduces the rigidity of the area of the tread that leads to a fall in performance tires. Thus, to obtain the optimal combination of characteristics of the channel for water drainage and traction characteristics of the tire, the width of the channel for water flow at the narrowest point should preferably be from 0.2 to 1.0 mm

In addition, the area of the surface which contact each of the protrusions 6 and the road surface should preferably be from 0.03 to 20 mm 2. For areas of the surface of the ledge with the road surface is less than 0.03 mm2the effectiveness of the present invention will be reduced because of the difficulty of obtaining the desired spot and provide the necessary rigidity obtained the contact spot. If the area of contact of each of the protrusions 6 and the road surface exceeds 20 mm2the effectiveness of the present invention will be reduced because of the difficulty of receiving channels for water to the desired cross-section between multiple tabs 6 and, as a consequence, due to the fall of the efficiency of water removal. From the viewpoint of obtaining high efficiency surface area of contact of each of the protrusions 6 and the road surface preferably should be from 0.07 to 10 mm2.

The contact surface of the protrusion 6 and the road surface should preferably have an approximately round shape. On figa and 2B shows an example that uses approximately round shape of the site of contact. Such use approximately round shape as the surface shape of the contact protrusion 6 and the road surface is preferable because it can be simply and surely get the desired width of the channel for water flow at the point of confluence of the channels 7, in which the channels for water to meet at least three direction the clusters; reduced differences in stiffness with respect to applied under varying angle of the external force and its effect on the shape of the protrusions 6, and it becomes possible to suppress changes in performance tires with regular placement of many of the projections 6 on the grid (figa) or oblique lattice (pigv) on the tread pattern.

On figs shows an example in which the contact surface of the protrusion with the road surface has a square shape with rounded edges and protrusions placed on a skew lattice. This option is preferable because it improves the efficiency of the edge effect in comparison with the use of approximately round shape contact surface of the protrusion with the road surface. In addition, if the contact surface of the protrusion with the road surface has the shape of a regular hexagon when placing protrusions tilted at a certain angle you can get the same width of the channel for water flow at the point of confluence of the channels for water drainage 7, in which the channels for water to meet at least three directions, without rounded corners.

Examples of carrying out the invention

Produced six types of pneumatic tyres (Standard example, Comparative examples 1-3 and Working examples 1 and 2), all of the test tires had the common size 215/60R16. For which each tire was varied presence/absence, the shape/height and the coefficient for the square protrusions. On protectors inflicted cuts a depth of 6 mm, an amplitude of 0.8 mm and a pitch of 2.4 mm

Each of the six types of tires mounted on rims size 16X7J (primary disk), pumped up the air pressure of 220 kPa and put it on the sedan with an engine capacity 2000 CC (type FR). Then on the ground held the following sea trials. The results are given in table 1. Pneumatic tire in accordance with the present invention have excellent characteristics braking on ice and directional stability on snow and demonstrated significantly higher performance compared with pneumatic tires Standard example and Comparative examples.

(1) Test the braking performance on ice

Measured braking to a complete stop at an initial speed of 80 km/h along the ground, imitating the icy pavement. The index values of the braking distance was calculated, based on the value of 100 for the Standard example. Higher index values correspond to the best braking performance on ice.

(2) Test stability on snow

Carried out the assessment of the behavior of the vehicle test pilot on the road landfill, simulating snow-covered road surface. Index values were calculated on the basis of in the mask 100 for bus Standard.

Higher index values correspond to the best stability on snow.

DIGITAL signs

1: the tread Surface of the pneumatic tire

2: the Main groove

3: Transverse groove

4: Plot of contact with the road

5: Cut

6: Projection

7: Point merge channels for water flow

D: the Depth of the slits or small holes

h: the height of the ledge

1. A pneumatic tire having a tread surface areas of contact with the road surface in the form of ribs separated by many of the main grooves, and/or many block contact areas separated by grooves in the direction of the width of the tires,
at the regions of contact are slits or small holes, there are many protrusions, the height of which is less than the depth of the slits or small holes, protrusions arranged to form a pattern in which the width of the channel for water flow increases at the point of confluence of the channels and arranged in a grid between the projections channels for water flow converge from at least three directions, and the ratio of the area of many ledges to the square block area of contact with the road surface is 0.5 or more and 0.9 or less.

2. Pneumatic tire according to claim 1, in which the height of the protrusions extending t is from 0.1 to 0.5 mm.

3. Pneumatic tire according to claim 1 or 2, in which the minimum distance between adjacent protrusions is from 0.2 to 1.0 mm

4. Pneumatic tire according to claim 1 or 2, in which the surface area of contact of each of the protrusions with the road surface is from 0.03 to 20 mm2.

5. Pneumatic tire according to claim 1 or 2, in which the contact surface of the protrusion with the road surface has an approximately circular shape.



 

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FIELD: transport.

SUBSTANCE: invention relates to automotive tire with tread for winter operating conditions. Set of GB blocks is arranged on, at least, part of tire tread 1 with blocks 3 located nearby each other. Said blocks are formed by grooves 2 and separated one from another. Symbol P (mm) designates characteristic spacing of blocks in said group GB. Symbol W (mm) designated width of set of blocks. Symbol a (pcs) designates quantity of blocks 3 in design area Z of aforesaid group GB. Design area is demarcated by characteristic length of spacing P and width W while symbol N (%) designates negative factor in area Z. Density S of blocks per unit of actual area of contact spot of said group is defined by the formula S=a/{P×W×(1-N/100)} and set in the range of at least 0.003 (pc./mm2) to not over 0.04 (pc./mm2).

EFFECT: higher efficiency on ice.

6 cl, 18 dwg, 4 tbl

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