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Pneumatic tire

A pneumatic tire, tire circumferential technology, applied to tire parts, tire tread/tread pattern, transportation and packaging, etc., can solve the problem of insufficient suppression of local partial wear at the main rib, deterioration of tear resistance, Rigidity reduction and other issues

Active Publication Date: 2018-06-01
TOYO TIRE & RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the dents on both sides are formed large, the rigidity of the sacrificial rib decreases and the tear resistance deteriorates, and when the dents on both sides are formed small, partial partial wear at the main rib cannot be sufficiently suppressed.

Method used

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  • Pneumatic tire
  • Pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] Embodiments of the present invention will be described with reference to the drawings. figure 1 The tread 10 of the pneumatic tire T of the present embodiment is schematically shown. figure 2 Will figure 1 An enlargement of the main part surrounded by the dotted box is given.

[0021] This pneumatic tire T has a pair of beads (not shown) and a pair of sidewalls extending outward in the tire radial direction from the beads in the same way as a normal pneumatic tire. connected to the outer end. In addition, a carcass extending in an annular shape is provided between a pair of beads, and reinforcing members such as a belt for reinforcing the carcass are embedded in the tread 10 , but illustration of these is omitted.

[0022] A plurality of main grooves extending in the tire circumferential direction are formed on the tread 10 , and in the present embodiment, four main grooves 11 to 14 are formed. The tread 10 is divided into a plurality of land portions including a s...

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PUM

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Abstract

The present invention provides a pneumatic tire in which a narrow groove extending in a tire circumferential direction is formed in a shoulder land portion, and the pneumatic tire is excellent in a groove bottom crack resistance, an irregular wear resistance and a tear resistance. A pneumatic tire comprising a narrow groove (3) extending in a tire circumferential direction, the narrow groove (3) being formed in a shoulder land portion of a tread, wherein an inside concave curved surface (41) and an outside concave curved surface (42) are formed in a groove bottom portion of the narrow groove (3), the inside concave curved surface (41) being obtained by depressing a groove wall in a tread center side and the outside concave curved surface (42) being obtained by depressing a groove wall in atread end side, and the groove bottom portion of the narrow groove (3) is provided as a shape which is wider than an opening portion of the narrow groove (3) and is rounded, and wherein a height (H1)of the inside concave curved surface (41) measured along a depth direction of the narrow groove (3) is greater than a height (H2) of the outside concave curved surface (42).

Description

technical field [0001] The present invention relates to a pneumatic tire in which thin grooves extending in the tire circumferential direction are formed on shoulder land portions of a tread. Background technique [0002] For example, as disclosed in Patent Documents 1 and 2, a pneumatic tire is known in which narrow grooves extending in the tire circumferential direction are formed on shoulder ribs (an example of a shoulder land portion) of a tread. The shoulder ribs are divided into main ribs on the tread center side and sacrificial ribs on the tread end sides by the thin grooves. In the tire configured in this way, wear can be concentrated on the sacrificial ribs, so wear of the main ribs is suppressed, and uneven wear resistance is improved. The fine grooves are also called defensive grooves, and are mainly formed in heavy-duty pneumatic tires used for trucks, buses, and the like. [0003] However, partial partial wear may sometimes occur even if the fine grooves and m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/01B60C11/03
CPCB60C11/01B60C11/0323B60C2011/013B60C11/1323B60C2011/0348B60C2011/0355B60C2011/0353
Inventor 长谷田弘到
Owner TOYO TIRE & RUBBER CO LTD
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