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Pneumatic tire for traveling on off road

A technology for pneumatic tires and roads, which is applied to off-road vehicle tires, tire parts, tire treads/tread patterns, etc., and can solve problems such as air leakage resistance and wear, sufficient traction performance, and small air leakage effects. problems, to achieve the effect of improving air leakage resistance, improving traction performance, and ensuring traction performance

Inactive Publication Date: 2008-04-02
TOYO TIRE & RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the above-mentioned tire, the groove wall surfaces facing the grooves provided with the protrusions all stand up straight, so it is easy to pinch pebbles etc. between the facing groove wall surfaces fall off, so less effective in suppressing air leaks caused by trapped stones
In addition, as described in Patent Document 2, the method of alternately providing protrusions of different sizes on the bottom of the groove cannot be said to have sufficient anti-leakage performance and traction performance at the later stage of wear.

Method used

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  • Pneumatic tire for traveling on off road
  • Pneumatic tire for traveling on off road
  • Pneumatic tire for traveling on off road

Examples

Experimental program
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Embodiment approach

[0040] Next, other embodiments of the present invention will be described.

[0041] (1) In the above embodiment, an example having a tread pattern formed with the blocks shown in FIG. 1 was shown, but the blocks are not limited to this shape, and may be approximately square, rectangular, parallelogram, or rhombus. , polygon, etc. any pattern block shape.

[0042] (2) In the above-mentioned embodiment, the example in which a continuous convex line is provided on the entire groove bottom of the horizontal groove arranged between the three vertical grooves and the vertical groove arranged on the most central side is shown, but as shown in FIG. As shown in 3, in the present invention, it is preferable to provide protruding lines 5c at the bottoms of the longitudinal grooves 1a and 1c on both sides, so that continuous protruding lines 5 having approximately the same height are provided around the block 10. In this case, the step portions SP may also be formed on the groove wall surf...

Embodiment 1

[0058] In the tread pattern shown in FIG. 1 and FIG. 2, the depth DA of the longitudinal groove 1 and the lateral groove 2 is set to 12.5 mm, the groove width WA is set to 14 mm, the height HA of the step portion is set to 2 mm, and the width WB of the rib 5 is set. is 3mm, height DB is 4mm, interval W C is 1.5mm, and a radial tire with a specification of 35×12.50R 15LT is manufactured. The tires were used for each performance evaluation described above, and the evaluation results are shown in Table 1.

Embodiment 2

[0060] As shown in FIG. 3 , a radial tire was manufactured in the same manner as in Example 1, except that the ridge 5 c having the same shape and size was further set. The tires were used for each performance evaluation described above, and the evaluation results are shown in Table 1.

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Abstract

In a pneumatic tire for traveling on an off road, including a tread pattern in which a plurality of blocks are formed by at least three vertical grooves extending along a tire circumferential direction and a lateral groove intersecting the vertical grooves, each of the lateral groove arranged among the three vertical grooves and the vertical groove arranged in a middest portion has a groove wall surface forming a step portion, and a projecting stripe continuing approximately at an identical height is provided at a whole of each groove bottom thereof.

Description

technical field [0001] The present invention relates to a pneumatic tire for traveling on bad roads, such as desert race tires and slush tires, which are used on bad roads such as deserts, gravel roads, muddy roads, and rocky roads. Background technique [0002] Tires for bad roads are mainly used on bad roads such as deserts, gravel roads, muddy roads, and rocky roads, so it is necessary to prevent air leakage caused by trapped stones. Therefore, by making the cross-sectional shape of the groove into a V shape, it is difficult to catch pebbles or the like or it is easy to drop pebbles or the like. However, V-shaped grooves have insufficient air leakage resistance and insufficient traction performance at the later stage of wear. [0003] On the other hand, for truck tires that often run on gravel roads, etc., a method of providing a convex portion on the bottom of the groove has been disclosed as a technique for preventing air leakage caused by trapped stones. For example,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/117
CPCB60C11/13B60C11/0311Y10S152/01B60C11/047Y10S152/902B60C2200/14
Inventor 宫崎哲二
Owner TOYO TIRE & RUBBER CO LTD
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