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pneumatic tire

A technology for pneumatic tires and tires, which is applied to tire parts, tire treads/tread patterns, vehicle components, etc., can solve the problems of increased collision noise between pattern blocks and road surfaces, and achieve the goal of reducing collision noise and reducing collision noise Effect

Inactive Publication Date: 2011-11-30
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, even in this case, when the same pitch variation is applied to the entire width of the tread contact patch, the blocks are arranged symmetrically with respect to the tire equator line, and when the tire rolls under a load, the step-in of a plurality of blocks The edge and the road surface collide at the same time, which leads to an increase in the collision noise between the tread block and the road surface

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0047] Conventional tires, comparative tires, and example tires having a specification of 315 / 80R22.5 were prepared, and each tire was mounted to a rim having a size of 9.00x22.5, inflated at an air pressure of 650Kpa, applied with a load of 2800kgf, and tested on a European-based The vehicle pass-through noise test is evaluated under the conditions of the noise regulation (LI=156 conditions).

[0048] The condition of LI (load index) = 156 used here refers to the classification C3 (main is the condition of TBR).

[0049] Table 1 shows the results and specifications of each tire.

[0050] Conventional tires have Figure 4 The tread pattern shown in , while the comparative tires and the example tires are all as follows figure 1 The tread pattern shown is the basic pattern.

[0051] A tire inflated with an air pressure of 850Kpa was mounted to a drive shaft of a tractor, a trailer with a constant load was coupled to the drive shaft and traveled 50,000KM on a highway. The h...

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Abstract

The present invention aims to provide a pneumatic tire capable of effectively preventing a large collision noise caused by simultaneous collision of a plurality of blocks of each row with a road surface. The six block rows (9, 10, 13) on the tread contact surface (1) consist of five circumferential grooves (2, 3, 4) extending continuously in a zigzag manner in the circumferential direction of the tread. A plurality of transverse grooves (5, 6, 11) extending in the tread width direction are defined between adjacent circumferential grooves and between the outermost circumferential groove (4) and the corresponding tread side edge (e). The five circumferential grooves (2, 3, 4) include circumferential narrow grooves (2, 4) and a pair of circumferential wide grooves 3, and a pair of circumferential wide grooves (3) are arranged on both sides of the tire equator line and are narrower than the circumferential direction The width of the slots (2, 4) is wide. The transverse grooves (5, 6) are inclined relative to the tread width direction. Each pattern block (7, 8, 12) of the pattern block row (9, 10, 13) has a polygonal plane profile shape with more than six sides, and at the same time, the minimum length of the pattern block in the tread width direction is located at the The length in the tread width direction of the central portion of the block in the tread circumferential direction is longer than the length in the tread width direction of the end portion in the tread circumferential direction. The tread edges (7a, 8a, 12a) of the blocks (7, 8, 12) of each block row (9, 10, 13) are spaced apart from each other in the circumferential direction of the tread when the tire rolls under load.

Description

technical field [0001] The present invention relates to a pneumatic tire, and in particular to a technique for reducing noise generated when blocks defined on a tread contact surface collide with a road surface. Background technique [0002] For a conventional pneumatic tire, for example, a pneumatic tire having a block pattern, one of the tire noises is the impact noise generated when the tread edges of the blocks collide with the road surface when the tire rolls under a load. Conventionally, a change in pitch has been widely employed to change this collision noise or the like into white noise. [0003] However, even in this case, when the same pitch variation is applied to the entire width of the tread contact patch, the blocks are arranged symmetrically with respect to the tire equator line, and when the tire rolls under a load, the step-in of a plurality of blocks The edge collides with the road surface at the same time, which leads to an increase in the collision noise...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/11B60C11/04
CPCB60C11/0306B60C11/0332B60C11/11
Inventor 松泽和贵
Owner BRIDGESTONE CORP
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