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Motorcycle tires for driving on uneven ground and tire vulcanization molds

A technology for tire vulcanization molds and motorcycles, which is applied to motorcycle tires, motorcycles, off-road vehicle tires, etc. It can solve the problems of insufficient improvement in the durability of pattern blocks, etc., to achieve the suppression of poor molding, the improvement of durability, and the suppression of defects Effect

Active Publication Date: 2017-11-21
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, even with such a tire, the improvement of block durability is not sufficient, and further improvement is required.

Method used

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  • Motorcycle tires for driving on uneven ground and tire vulcanization molds
  • Motorcycle tires for driving on uneven ground and tire vulcanization molds
  • Motorcycle tires for driving on uneven ground and tire vulcanization molds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0069] Based on the specifications in Table 1, a prototype was produced as figure 1 The basic structure shown, and with figure 2 Pneumatic tires for motorcycles with a tread pattern that is a basic pattern for driving on uneven ground. As Comparative Example 1, a tire in which no dimples were provided on the groove bottom surface was trial-manufactured. As Comparative Example 2 to Comparative Example 5, tires were trial-manufactured in which recessed portions were provided on the groove bottom surface, and protruding rubber and its cut-out marks were not provided between the recessed portions and the blocks. Furthermore, these trial tires were mounted on the rear wheels of a test vehicle, and their respective performances were tested. The general specifications and test methods of each test tire are as follows.

[0070] Vehicle used: motorcycle with a displacement of 450cc

[0071] Tire size: 110 / 90-19

[0072] Rim size: 2.50×19

[0073] Internal pressure: 80kPa

[007...

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Abstract

To provide a motorized two-wheeled vehicle tire for traveling on uneven terrain, the block durability performance of which has been improved; and a tire vulcanization mold capable of molding said tire. A motorized two-wheeled vehicle tire for traveling on uneven terrain wherein multiple blocks are provided on the tread at intervals in the tire circumference direction. Recesses are provided on the bottom surfaces of the grooves. Multiple recesses are provided at intervals in the axial direction of the tire. Spew, which was drawn up into the vent holes of the mold during vulcanization molding, or removal marks thereof are provided between each recess and the block that is adjacent in the tire circumference direction.

Description

technical field [0001] The present invention relates to a motorcycle tire for driving on rough terrain in which the durability of blocks provided on a tread portion is improved, and a tire vulcanizing mold capable of molding the tire. Background technique [0002] A tire for motorcycles used for running on uneven ground such as motocross races has a plurality of large blocks sparsely formed on the tread portion. This type of tire achieves grip because the blocks sink into the road. Therefore, improvement of the durability performance of the block is desired. [0003] In the motorcycle tire for running on rough terrain in the following Patent Document 1, recessed portions are provided between adjacent blocks in the tire circumferential direction so that the groove bottom surface of the tread portion is partially depressed. Such recesses can reduce stress concentration on the base of the block, thereby improving the durability of the block. [0004] Patent Document 1: Japan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C33/10B29D30/06B60C11/03B60C11/13B29L30/00
CPCB29C33/10B29D30/0606B29D2030/0612B29D2030/0617B60C11/032B60C11/11B60C11/1353B60C11/1376B60C2011/1361B60C2200/10B60C2200/14
Inventor 一柳丰
Owner SUMITOMO RUBBER IND LTD
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