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Pneumatic tire

A technology for pneumatic tires and tires, which is applied to pneumatic tires, special tires, tire parts, etc., can solve the problems of lower ground pressure, worse ground handling stability, and shorter ground contact length, etc., to improve handling stability. Effect

Active Publication Date: 2017-04-19
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the width of the land portion is set too large, the ground contact pressure at the center position in the tire width direction of the land portion will become low.
Therefore, both ends in the circumferential direction of the tire in the vicinity of the center position are deformed toward the interior of the land portion, and the ground contact length is shortened, which may lead to deterioration of ground contact performance and steering stability.

Method used

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  • Pneumatic tire
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0076] Set the tire size to 235 / 40ZR18 (95Y), make a figure 1 The tread pattern shown approximates the tread pattern and has figure 2 ( Figure 4 ) of the tread surface contour lines PL1, PL2, PL3 of the pneumatic tires of Examples 1 to 7. In addition, the various conditions at the outline details of the tread surfaces of the pneumatic tires of Examples 1 to 7 are as shown in Table 1 below.

[0077] On the other hand, the tire size was set to 235 / 40ZR18 (95Y), and the pneumatic tire of the conventional example was produced, except figure 2 The pneumatic tire of Conventional Example has the same structure as the pneumatic tire of Example 1 except that the contour lines PL1 , PL2 , and PL3 of the tread surface shown coincide with the reference contour line PL0 ′.

[0078] Each test tire of Example 1 to Example 7 and the conventional example produced in this way was assembled on a rim of 18 x 8.5J, and the air pressure was set to 230kPa, and installed on a passenger car with...

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Abstract

Provided is a pneumatic tire that improves, in a balanced way, maneuvering stability performance, hydroplaning resistance performance, and uneven-abrasion resistance performance. A profile line (PL1) of a center land section (X) projects further outward in the tire radial direction than a standard profile line (PL0). Including the tire width-direction outermost points (A2, A4) of center principal grooves (14a, 14b) and the tire width-direction end points (A5, A6, A7, A8) of shoulder primary grooves (14c, 14d), profile lines (PL2, PL3), of subcenter land sections (Y1, Y2) and shoulder land sections (Z1, Z2) which are partition-formed in sequence further outward in the tire width direction than the two center principal grooves (14a, 14b), project further outward in the tire radial direction than the standard profile line (PL0). The groove area ratio (Go) of a vehicle mount outside region and the groove area ratio (Gi) of a vehicle mount inside region satisfy the relationship Gi > Go.

Description

technical field [0001] The present invention relates to a pneumatic tire in which handling stability performance, wet skid resistance (hydroplaning resistance) performance and uneven wear resistance performance are improved in a balanced manner. Background technique [0002] It is known that the land portion width of the tread portion is set to be large in order to ensure tread rigidity in order to improve steering stability. However, if the width of the land portion is set too large, the ground contact pressure at the center position in the tire width direction of the land portion becomes low. Therefore, both ends in the circumferential direction of the tire in the vicinity of the center position deform toward the interior of the land portion, shortening the contact length, and possibly deteriorating the contact performance and steering stability. [0003] As a related art for improving steering stability performance as ground contact is improved, there is known a technolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/03B60C5/00B60C11/00
CPCB60C11/0306B60C2011/0388B60C11/033B60C2011/0341B60C2011/0358B60C2011/0383B60C3/04B60C2011/0386B60C2011/0381B60C11/0083B60C11/0304B60C11/0302B60C2011/0353
Inventor 须贺勇一
Owner THE YOKOHAMA RUBBER CO LTD
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