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pneumatic tire

A technology of pneumatic tires and tires, used in pneumatic tires, tire parts, road tires, etc.

Active Publication Date: 2022-02-11
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In conventional pneumatic tires, there is a problem of balancing driving stability on dry and wet roads and noise performance related to passing noise.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0068] Tables 1 to 3 are tables showing the results of performance tests of the pneumatic tires of the present invention. In this performance test, evaluations were performed on dry driving stability performance, wet driving stability performance, and noise performance for different pneumatic tires. In these performance tests, a test tire having a size of 225 / 60R18100H was attached to a rim having a rim size of 17×7.5 JJ, and an air pressure of 240 [kPa] was applied. In addition, as a test vehicle, an FF (Front engine Front drive: front-wheel drive) SUV (Sport Utility Vehicle: Sports Utility Vehicle) vehicle with a displacement of 2400 [cc] was used.

[0069] In the evaluation of dry driving stability performance, the test vehicle was driven on a dry road surface test track having a flat circular track at a speed of 60 [km / h] to 100 [km / h]. Then, the test drivers performed sensory evaluations on the drivability when changing lanes and when turning, and the stability when goin...

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Abstract

The invention takes into account driving stability and noise performance on dry road surface and wet road surface. The pneumatic tire 10 has first main grooves 11 extending in the tire circumferential direction at positions outside the tire equatorial plane CL in the vehicle width direction, and second main grooves 12 extending along the tire at positions closer to the tire equatorial plane CL than the first main grooves 11. The tire circumferential direction extends; the third main groove 13 extends along the tire circumferential direction at a position inside the tire equatorial plane CL in the vehicle width direction; and the fourth main groove 14 is at a position farther from the tire equatorial plane CL than the third main groove 13 Extending along the tire circumferential direction, set the groove width of the first main groove 11 as G1, the groove width of the second main groove 12 as G2, the groove width of the third main groove 13 as G3, and the fourth main groove 13 as G3. When the groove width of the groove 14 is set to G4, there are relationships of 1.05≤G1 / G3≤1.25, 1.20≤G2 / G3≤1.40, 1.10≤G4 / G3≤1.30, and G3<G1<G2 and G3<G1 <G4 relationship.

Description

technical field [0001] The present invention relates to a pneumatic tire. Background technique [0002] In conventional pneumatic tires, there is a problem that both driving stability on dry roads and wet roads and noise performance related to passing noise should be balanced. The techniques described in Patent Document 1 and Patent Document 2 are known as conventional pneumatic tires related to this subject. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: International Publication No. 2015 / 005194 [0006] Patent Document 2: Japanese Patent No. 5695476 Contents of the invention [0007] The problem to be solved by the invention [0008] The pneumatic tires described in Patent Document 1 and Patent Document 2 have room for improvement in terms of both driving stability on dry roads and wet roads and noise performance related to passing noise. [0009] An object of the present invention is to provide a pneumatic tire capable of achie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C5/00B60C11/03B60C11/12
CPCB60C11/0306B60C2011/0383B60C2011/0381B60C2011/0388B60C2011/0386B60C11/0304B60C2011/0348B60C2011/0353B60C11/12B60C11/1236B60C11/24B60C13/001B60C19/001B60C2011/0355B60C2200/04
Inventor 根本雅行
Owner THE YOKOHAMA RUBBER CO LTD