Pneumatic tire and tire wheel assembly

A technology of pneumatic tires and tires, applied in pneumatic tires, tire parts, tire treads/tread patterns, etc., can solve problems such as no consideration of tire skid resistance, inability to reduce noise and tire skid resistance, uneven wear, etc. , to achieve the effect of improving control stability, enhancing stiffness, and inhibiting shrinkage

Inactive Publication Date: 2008-04-09
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in these tires, insufficient consideration has been given to the anti-floating ability of the tire on road surfaces where the water depth exceeds the wet road surface
In addition, since they are designed without considering the camber angle applied to the tire when the tire is installed on the vehicle, the noise during the rotation of the tire cannot be well realized during the actual driving of the vehicle on which this tire is installed. Reduced and anti-skidding ability of the tire, but also there is a problem of uneven wear in the inner side of the tire mounted on the vehicle

Method used

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  • Pneumatic tire and tire wheel assembly
  • Pneumatic tire and tire wheel assembly
  • Pneumatic tire and tire wheel assembly

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0189] Each of the example tires and comparative example tires each having a tire size of 225 / 55R16 was assembled on a 7.0J-16 rim, charged with an air pressure of 210 kPa, and then mounted on a vehicle. Under the condition that the negative camber of the front wheels is 0.3° and the negative camber of the rear wheels is 0.5°, the vehicle is actually driven with two passengers, and the tire tires on a dry road surface are measured during the process. The wear rate of the surface sections between the shoulders, the speed at which tire skidding occurs, the vehicle interior noise and handling stability.

[0190] Example tire 1 has figure 1 Tread pattern shown in which the oblique grooves in the second inner land portion row have an angle of 45° with respect to the transverse direction of the tread, and the lug grooves in the second outer land portion row have an angle of extension is 30°, and the average extension angle of the lug grooves in the row of axially outer shoulder lan...

example 2

[0214] The tire size is 215 / 45R17 and the tread pattern is as follows Figure 25 Each of the example tires shown and the comparative example tires were assembled on a rim of 7.5J×17 and filled with an internal pressure of 220kPa, a camber angle of -0.5° was applied to make the contact length on the axial inner side long, and then at 30km Change the slip angle from 0 to 5 degrees at a speed of 1 / h to measure the resulting turning direction stress.

[0215] When the difference in stress in the direction of turn between 0° and 1° is Cf1, the difference in stress in the direction of turn between 0° and 2.5° is Cf2, and the difference in stress in the direction of turn between 0° and 5° With a value of Cf3, if Cf2 / Cf1 is 2.5 and Cf3 / Cf1 is 5, turning direction stresses are generated linearly, while if Cf2 / Cf1 is greater than 2.5, turning direction stresses increase nonlinearly at locations with large slip angles , if Cf2 / Cf1 is less than 3, the stress in the turning direction decr...

Embodiment 3

[0224] Each of the example tires and comparative example tires each having a tire size of 235 / 45R17 was assembled on a rim of 8J×17, charged with an internal pressure of 210 kPa, and then mounted on a vehicle in which two passengers In the state, the camber angle at the front wheel is -0.4°, and that at the rear wheel is -0.6°.

[0225] • Carry out a wear test on the vehicle. The test condition is to drive 20,000km on expressways, ordinary roads and mountain roads according to the ratios of 50%, 40% and 10% respectively. After running, the wear amount ratios of the lateral central portions of the two shoulder portion rows on the two front wheels were measured. A case where the ratio is greater than 100 indicates that the axially inner side is extremely worn, and a case where the ratio is less than 100 indicates that the axially outer side is extremely worn.

[0226] • The vehicle was subjected to an acceleration test from a speed of 50 km / h in a water tank having a water dep...

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Abstract

The reduction of noise in the rotation of the tire and the improvement of resistance to hydroplaning are established and also the resistance to uneven wear is improved, in which four circumferential main grooves 2-5 are formed asymmetrically, and a sum of groove volume in a circumferential direction in lateral grooves formed in a shoulder land part row 7 as a portion of an axially inner side per unit width is made smaller than a sum of groove volume in the circumferential direction in lateral grooves 11 formed in a shoulder land part row 9 as a portion of an axially outer side and a land part row 6 in a central region is rendered into a rib, and slant grooves 13 extending at an average inclination angle of not less than 45 DEG with respect to a widthwise direction of the tread are arranged in a second inner land part row 8 located at a side of an equatorial line adjacent to the shoulder land part row 7 at the axially inner side and these slant grooves 13 are opened to the circumferential main groove located adjacent to the second inner land part row 8 of the axially inner side.

Description

technical field [0001] The present invention relates to a pneumatic tire and a tire-wheel assembly capable of simultaneously achieving reduction of noise during tire rotation, resistance to tire skidding, and improvement of resistance to uneven wear. Background technique [0002] A conventional technique is disclosed in JP-A-10-217719 for improving the wet running performance of tires and controlling uneven wear and tire noise. [0003] According to this technique, when the tire tread is actually divided into an outer region directed to the outside of the vehicle and an inner region directed to the inner side of the vehicle with respect to the tire equator, one longitudinal outer main groove extending linearly in the tire circumferential direction is provided in the outer region , and in the inner region are provided first and second longitudinal inner main grooves linearly extending along the tire circumferential direction, these longitudinal main grooves are asymmetrical w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/03B60C5/00B60C11/04B60C11/01B60C11/00B60C11/13
CPCB60C2011/0388B60C11/033B60C11/0304B60C11/124B60C11/13B60C11/0302B60C11/1384B60C11/032B60C11/1218B60C11/01B60C11/0306
Inventor 大泽靖雄泽田贵文佐口隆成藤田一人富田新
Owner BRIDGESTONE CORP
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