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pneumatic tire

A technology of pneumatic tires and tires, which is applied to the reinforcement layer of pneumatic tires, tire parts, tire tread/tread pattern, etc., which can solve the problem of increased radiation noise, achieve the effect of suppressing radiation noise and improving noise performance

Active Publication Date: 2021-09-21
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in recent years, the weight of tires has been reduced in order to reduce the rolling resistance of tires. However, with the reduction in weight, the vibration damping performance of tires during rolling is reduced, and the radiation noise emitted from tires tends to increase.

Method used

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no. 1 Embodiment approach

[0025] Such as figure 1 As shown, a pneumatic tire (hereinafter also simply referred to as a "tire") 10 according to the first embodiment of the present invention includes a carcass 12 spanning between a pair of bead portions 11 in an annular shape, The inclined belt layer 13 outside the crown portion in the tire radial direction, the circumferential cord layer 14 , and the tread 15 arranged outside the inclined belt layer 13 in the tire radial direction. The pneumatic tire 10 is mounted on an automobile and used, but is particularly suitable as a pneumatic tire for a passenger car.

[0026] In addition, the circumferential cord layer 14 is arranged on the inner side in the tire radial direction of the tread 15, and may be arranged on either the outer side in the tire radial direction than the inclined belt layer 13 or the inner side in the tire radial direction than the inclined belt layer 13. .

[0027] The inclined belt layer 13 has cords extending obliquely with respect...

no. 3 Embodiment approach

[0064] Such as image 3 As shown in (a), the pneumatic tire 30 according to the third embodiment of the present invention has a structure in which the inclined belt layer 31 includes at least a wide inclined belt layer having a relatively wide width in the tire width direction passing through the tire equator CL. 31a and the narrow slanted belt 31b passing through the tire equator CL with a relatively narrow width in the tire width direction, when the inclination angle of the cords of the wide slanted belt 31a with respect to the tire circumferential When the inclination angle of the cords of the inclined belt layer 31b with respect to the tire circumferential direction is θ2, 30°≦θ1≦85°, 10°≦θ2≦30° and θ1>θ2. The other structures and functions are the same as those of the pneumatic tire 10 of the first embodiment described above.

[0065] In the present embodiment, the narrow slanted belt layer 31b of the pneumatic tire 30 has a width in the tire width direction of about 0.5...

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Abstract

The pneumatic tire comprises: a carcass (11); at least one inclined belt layer (13), which is arranged on the radially outer side of the crown portion of the carcass (11) through the tire equator, and has a cords extending obliquely at an angle of 30° or more; and a tread (15) arranged on the tire radially outer side of the inclined belt layer (13) and arranged on the tire radial inner side of the tread (15) The circumferential cord layer (14) has a high stiffness region as a region including the tire equator (CL) and a low stiffness region as regions on both sides in the tire width direction of the high stiffness region, in which the tire width direction The tire circumferential stiffness per unit width in the tire width direction is relatively high, and in the low stiffness region, the tire circumferential stiffness per unit width in the tire width direction is low, so that the groove area ratio in the ground contact width of the tread (15) is higher in the high stiffness region than in the low stiffness region.

Description

technical field [0001] The present invention relates to a pneumatic tire. Background technique [0002] Tire noise generated by tires rolling while a car is running is considered one of tire performance, and various improvements to improve tire performance have been studied. One of the causes of tire noise is radiation noise caused by vibration of the tread portion. [0003] However, in recent years, the weight of tires has been reduced to reduce the rolling resistance of tires. However, with weight reduction, the vibration damping performance of tires during rolling decreases, and radiation noise emitted from tires tends to increase. [0004] As a pneumatic tire for reducing radiation noise, for example, a pneumatic tire having improved noise performance while maintaining steering stability performance and rolling resistance performance has been proposed (see Patent Document 1). [0005] prior art literature [0006] patent documents [0007] Patent Document 1: Inter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C9/18B60C9/22B60C11/03
CPCB60C9/22Y02T10/86B60C11/033B60C2009/2233B60C9/2009B60C2009/2051B60C9/30B60C9/20B60C2009/2019B60C2009/2058B60C2009/2271
Inventor 桑山勲
Owner BRIDGESTONE CORP