pneumatic tire

A technology for pneumatic tires and tires, applied in tire parts, tire treads/tread patterns, vehicle parts, etc., can solve problems such as stress concentration and block drop, improve mud performance, improve resistance to block drop, The effect of superior mud performance

Active Publication Date: 2019-06-11
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a problem in the relatively small rigid portion that stress concentrates during running, and block defects such as block drop are likely to occur near the crown recess facing the main groove of the crown block.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0072] Based on the specifications in Table 1, a trial production with figure 1 The tires (size: 225 / 95R16C) of Examples 1 to 7 with the basic pattern shown were tested for the performance of the above-mentioned tires. In addition, as a comparative example, a tire in which the divided crown block was formed with a crown recess at a position connected to the main groove was trial-manufactured and tested in the same manner. In addition, as Example 8, a trial production of figure 1 As a reference, a tire having a crown block whose tread is approximately quadrangular in shape by connecting the inner top and outer top of each main groove by a crown lateral groove was similarly tested.

[0073] The test method is as follows.

[0074]

[0075] Each test tire was installed on all wheels of the test vehicle at the internal pressure (front tire: 250kPa, rear tire: 475kPa), and after driving on a test course including a muddy road, the traction performance on the muddy road was evalu...

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Abstract

The invention provides a pneumatic tyre capable of maintaining performance in mud and improving chipping-resistance performance; the pneumatic tyre comprises a tyre surface portion (2); the tyre surface portion is provided with a pair of jagged main grooves (3) extending on two sides of a tyre equator (C) along the periphery of the tyre, and a plurality of tyre crown transverse slots (9) connecting the main grooves so as to form a plurality of tyre crown pattern blocks (8C); a portion, having a tread face, of each tyre crown pattern block (8C) is connected with the adjacent tyre crown transverse slot (9) so as to recess to the tyre radial direction, thus forming a tyre crown concave (10); the tyre crown concave (10) form the main groove (3) far away from two sides. The pneumatic tyre can reduce local rigidity difference of the tyre crown pattern blocks (8C), thus improving chipping-resistance performance.

Description

technical field [0001] The present invention relates to a pneumatic tire which takes into account both the mud performance and the block resistance performance. Background technique [0002] The following Patent Document 1 proposes a pneumatic tire for off-road use. The pneumatic tire has a plurality of main grooves extending in a zigzag shape continuously along the tire circumferential direction on both sides of the tire equator on the tread portion, and by separating the main grooves between the main grooves. A plurality of crown transverse grooves connected to divide a plurality of crown blocks. The crown block has a crown recess in which a part of the tread is recessed inward in the tire radial direction. When such a tire is running on a muddy road, the concave portion of the crown compresses the mud and cuts it off, thereby generating greater grip (hereinafter, the running performance on a muddy road is sometimes referred to as "mud performance."). [0003] Patent Doc...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B60C11/03
Inventor西胁隆志
OwnerSUMITOMO RUBBER IND LTD