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Pneumatic tire

A technology for pneumatic tires and tires, which is applied to pneumatic tires, tire parts, tire treads/tread patterns, etc. Facial rigidity reduction and other problems, to achieve the effect of improving driving stability, snow performance, and handling stability.

Active Publication Date: 2021-03-23
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when the number of lug grooves in the tread portion is increased, the rigidity of the tread portion decreases, and the driving stability on a dry road surface decreases.
Conversely, when the number of lug grooves in the tread portion is reduced, the snow performance when the chain is attached decreases.
Like this, it is difficult to simultaneously improve handling stability on dry roads and snow performance when a chain is attached

Method used

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  • Pneumatic tire
  • Pneumatic tire
  • Pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0043] The tires of Examples 1 to 7 were produced. These tires had a tire size of 225 / 45R18 and were provided with a tread portion, a pair of sidewall portions, and a pair of bead portions. The four main grooves of the central main groove and a pair of shoulder main grooves, divided by these main grooves: a central land; a pair of intermediate lands located outside the central land; and a pair of shoulder lands located in the Outer side of the middle land portion, the pneumatic tire is assigned the attachment direction relative to the vehicle, and in the pneumatic tire, such as figure 2 As shown, the shoulder land portions on the vehicle inner side and the vehicle outer side respectively have lugs and sipes extending in the tire width direction, one end of the lug grooves in the shoulder land portion reaches at least the ground contact end, and on the other hand, the other One end is terminated in the shoulder land portion, and one end of the sipe of the shoulder land portion...

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Abstract

Provided is a pneumatic tire that enables stable handling performance on both a dry road surface and a snowy road surface. Lug grooves 33, 34 in shoulder land sections 24, 25 have ends reaching at least respective tread grounding ends E and other ends that terminate in the respective shoulder land sections 24, 25. Sipes 43, 44 in the shoulder land sections 24, 25 have ends connected to the respective shoulder main grooves 13, 14 and other ends that terminate in the respective tread grounding areas. Lug grooves 31, 32 in intermediate land sections 22, 23 have ends connected to the respective shoulder main grooves 13, 14 and have other ends that terminate in the respective intermediate land sections 22, 23. Sipes 42 in the intermediate land section 22 have one end connected to a center groove 11 and the other end that terminates in the intermediate land section 22. Sipes 41 in a center land section 21 have one end connected to the center main groove 11 and have the other end that terminates in the center land section 21 without going beyond the tire center line CL.

Description

technical field [0001] The present invention relates to a pneumatic tire in which four main grooves extending in the tire circumferential direction are provided on the tread portion, and five rows of lands are divided by these main grooves. More specifically, it relates to a pneumatic tire capable of driving on dry roads Pneumatic tire for stability and snow performance with chains attached. Background technique [0002] Pneumatic tires employ a tread pattern in which a plurality of main grooves extending in the tire circumferential direction are provided in a tread portion, and a plurality of rows of land portions are defined by these main grooves. Furthermore, in such a pneumatic tire, a plurality of lug grooves extending in the tire width direction are provided in each land portion of the tread portion (for example, refer to Patent Document 1). [0003] However, when the number of lug grooves in the tread portion is increased, the rigidity of the tread portion decreases,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C5/00B60C11/03B60C11/12B60C11/13
CPCB60C11/12B60C2011/0341B60C2011/0381B60C2011/1227B60C11/0304B60C11/0306B60C2011/0388B60C2011/039B60C2011/0386B60C2011/133Y02T10/86B60C11/1236B60C2011/0346B60C11/033B60C11/1392
Inventor 渡边大辅
Owner THE YOKOHAMA RUBBER CO LTD