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Pneumatic tyre

A technology of pneumatic tires and tires, which is applied in the direction of special tires, tire parts, tire tread/tread pattern, etc., and can solve the problems of uneven ground pressure on the ground surface, easy wear, reduced handling stability and partial wear performance, etc. , to achieve the effect of high drainage performance

Active Publication Date: 2011-10-19
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For these reasons, previous pneumatic tires such as Figure 9 As clearly stated in Part A of , it can also be understood from the fact that the tire circumferential length LB of the contact patch on both sides of the longitudinal groove increases, as the contact pressure on both sides of the longitudinal groove G increases, the entire contact patch Ground contact pressure becomes uneven, so there is a tendency for handling stability and partial wear performance to decrease
In addition, for the opening, the ground contact end side of the longitudinal groove is larger due to the outward inclination of the tread profile, so there is a tendency to wear easily

Method used

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Experimental program
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Embodiment

[0081] Based on the specifications in Table 1, a trial production with figure 1 internal structure and figure 2 The size of the tread pattern is 175 / 65R15 pneumatic tires for passenger cars, and the handling stability is tested. The internals of the tires are the same. Each specification is as follows.

[0082] Tread width TW: 130mm

[0083] Groove width W1 of shoulder longitudinal groove: 10.0mm

[0084] Groove depth D1 of shoulder longitudinal groove: 8.2mm

[0085] Arrangement position L1 / TW of shoulder longitudinal groove: 23%

[0086] Angle θ1 of the groove wall on the tire equator side of the shoulder longitudinal groove: 15 degrees

[0087] Length ratio L4b / LA of the narrow portion of the shoulder lateral groove: 21%

[0088] Groove width W2 of straight longitudinal groove: 2.9mm

[0089] Groove width W3 of wavy longitudinal groove: 3.0mm

[0090] Groove depth D2 of straight longitudinal groove: 6.4mm

[0091] Groove depth D3 of wavy longitudinal groove: 6.4...

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Abstract

The invention relates to a pneumatic tyre, which has the characteristics of drainage decrease prevention, operating stability improvement, noise performance and good anti-wearing performances. The tread contour of the pneumatic tyre in the invention comprises an inner side part and an outer side part. The inner side part comprises an inner side tyre surface reference face formed by circular arcs with a radius of curvature and an inner side chamfered circular arc face formed by circular arcs with a smaller radius of curvature. The outer side part comprises an outer side tyre surface reference face formed by circular arcs with a radius of curvature and an outer side chamfered circular arc face formed by circular arcs with a smaller radius of curvature. The outer side chamfered depth is larger than the inner side chamfered depth. The outer side chamfered depth is a normal-direction distance between an outer side imagined circular arc extending from outer side tyre surface reference face towards the axial inner side and the outer side chamfered circular arc face. The inner side chamfered depth is a normal-direction distance between an inner side imagined circular arc extending from the inner side tyre surface reference face towards the axial outer side and the inner side chamfered circular arc face.

Description

technical field [0001] The present invention relates to a pneumatic tire that suppresses a decrease in water drainage and improves handling stability, noise performance, and uneven wear resistance by improving the tread profile of a tread portion. Background technique [0002] Conventionally, a pneumatic tire is known in which a plurality of circular arcs with different radii of curvature are smoothly connected as the tread profile of the tread portion of the pneumatic tire in order to improve steering stability and uneven wear resistance. In addition, in order to ensure drainage performance, longitudinal grooves having a relatively large groove width are continuously provided in the tire circumferential direction. [0003] However, such pneumatic tires, such as Figure 8 As shown in (a) and (b), during tire vulcanization molding, the unvulcanized tread rubber g is pressed by the protrusions of the mold k for forming the longitudinal groove h, and rubber flow moves to both s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/13
CPCB60C11/0083B60C11/1376B60C3/00B60C3/04B60C11/03B60C11/0304B60C11/0309B60C11/0323B60C2011/0339
Inventor 田中进
Owner SUMITOMO RUBBER IND LTD
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