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Pneumatic tire

A technology of pneumatic tires and tires, which is applied to tire parts, tire treads/tread patterns, transportation and packaging, etc., can solve problems such as collapse, and achieve the effects of enhancing edge effects, improving driving performance, and improving effects

Inactive Publication Date: 2008-02-20
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, if the number of screw threads is increased, as shown in Fig. 6(B), a large collapse of the block is likely to occur.

Method used

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  • Pneumatic tire
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  • Pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0077] A studless tire for passenger cars (size 195 / 65R15) having the tread pattern shown in Fig. 12(A) was manufactured based on the thread in Fig. Handling safety is tested on paved roads. For comparison, an example in which all threads in the block are not displaced at all in the longitudinal direction at positions in the depth direction (comparative example 1), and an example in which displacement is performed but the turning point is set at the same position (comparative example 2 ) are tested together. Furthermore, each test tire was mounted on a rim (15×6JJ), and filled with an internal pressure (200kPa), and mounted on a vehicle (a displacement of 2000cm 3 , domestic FR car) on all wheels, on icy roads and dry paved roads, using the driver's sensory evaluation and taking the previous example as an index of 100, the steering wheel responsiveness, rigidity when driving, and when braking and Characteristics such as grip force during driving are evaluated. The larger th...

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PUM

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Abstract

It is an object of the present invention to improve the running performance on snowy and icy roads, and for this purpose, blocks provided with sipes are formed at a tread portion. The sipes (9A,9B) include an open top (Up) end that opens at a block surface (7S) and a bottom (Bo), and a configuration of the sipes (9A,9B) in a plane parallel with the block surface (7S) comprises a zigzag part (9a) extending in the length direction of the sipes. The zigzag part (9a) displaces upon turning back to one side and to the other side in a length direction of the sipes in the course from the open top end (Up) to the bottom (Bo). At least one block includes a first sipe (9A) and a second sipe (9B) which depths (d) of the turn-back points (11a,11b) of displacement from the open top end and / or positions of the turn-back points of displacement in the length direction differ from each other.

Description

technical field [0001] The present invention relates to a pneumatic tire suitable for running on ice and snow, such as a studless tire. Background technique [0002] In conventional air tires, it is considered effective to provide a block on the tread portion of the tire and to provide a plurality of sipings on the block to increase the edge effect in order to improve running performance on snowy roads. On the other hand, when the number of screw threads is increased, the block tends to undergo a large collapse as schematically shown in FIG. 6(B). In order to prevent such excessive collapse of the block, the applicant proposed a thread shape called Miura fold in JP 2003-25812, which was published earlier in the Japanese patent. [0003] The thread has a zigzag portion extending in the lengthwise direction of the thread in the thread shape of a plane parallel to the block surface, and the zigzag portion, between the aforementioned upper end portion and the aforementioned bot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/12B60C11/11
CPCY10S152/03B60C2011/1213B60C11/124Y10S152/902B60C11/1218B60C11/12B60C11/11
Inventor 坪野史宽
Owner SUMITOMO RUBBER IND LTD