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Pneumatic tire

A technology of pneumatic tires and tires, applied in off-road vehicle tires, tire parts, tire treads/tread patterns, etc., can solve the problems of low lateral grip performance and large sideslip, and achieve improved lateral grip performance, The effect of high friction, high traction performance

Inactive Publication Date: 2012-11-07
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventional tires have the problems of low lateral grip performance and relatively large sideslip

Method used

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  • Pneumatic tire
  • Pneumatic tire
  • Pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0056] Pneumatic tires (size: 205 / 65R15) each having the specifications in Table 1 were tested, and traction performance and lateral grip performance were evaluated for each test tire. In addition, the part which is not described in Table 1 is the same as an Example and a comparative example.

[0057] In addition, for traction performance and lateral grip performance, each test tire is mounted on all wheels of a four-wheel drive vehicle (200cc), and it is driven around a 2.2km off-road (unpaved road) test course at high speed. Circle, and evaluated by the driver's sensory evaluation on a five-point scale (the larger the value, the better). In addition, the vehicle has wheels with negative camber, and the angle thereof is 2°.

[0058] For traction performance, the evaluation is mainly centered on driving when going straight and when decelerating. For lateral grip performance, the initial responsiveness of turning, the amount of sideslip during turning, and the grip feeling whe...

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Abstract

The invention provides a pneumatic tire which is suitable for running on uneven ground as hauling ability and traverse grip ability. The pneumatic tire (1) comprises a plurality of lateral grooves (3) at the tread portion (2) axially extending along the tier and arranged at interval along the tire circumference, and a plurality of longitudinal grooves (4) connected between the lateral grooves (3)and arranged at interval along the tire axial direction to form a block pattern having a plurality of blocks B at the tread portion (2); the mounting direction of the vehicle is appointed; the longitudinal grooves (4) comprising at least a plurality of inclined grooves (7) each between the lateral grooves (3), and as viewed from above when the tire is mounted on the vehicle, the inclined grooves being inclined toward the inside of the vehicle while extending toward a traveling direction (F) of the vehicle, each inclined groove having a different angle with respect to the circumferential direction of the tire, and each angle becoming larger toward the outside of the vehicle.

Description

technical field [0001] The present invention relates to a pneumatic tire suitable for running on rough terrain suitable for off-road running such as rallying or dirt track racing, and more specifically, to a pneumatic tire capable of achieving both traction performance and lateral grip performance. Background technique [0002] In off-road driving such as rallying, pneumatic tires for driving on uneven ground are used. In order to improve the running time, such pneumatic tires are required to have traction performance for firmly grasping uneven road surfaces and transmitting driving force to the road surface, and lateral grip performance for suppressing tire sideslip during cornering. In order to satisfy these performances, conventionally, various proposals have been made regarding the shapes of blocks and / or grooves provided in the tread portion (see, for example, Patent Document 1 below). However, conventional tires have the problems of low lateral grip performance and re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/11
CPCB60C19/001B60C11/0304B60C2200/14B60C2011/0374
Inventor 中野敬太
Owner SUMITOMO RUBBER IND LTD