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Low noise tire

A technology for pneumatic tires and treads, applied in tire parts, wheels, transportation and packaging, etc., can solve the problems of decreased durability and commercial value, easy problems with mufflers, and low bonding efficiency. The effect of preventing the decline in the commercial value of tires and preventing the deterioration of durability

Active Publication Date: 2010-10-13
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the above-mentioned damming body is bonded to the inner surface of the tread, the damming body, especially the edge portion of the damming body is very prone to problems, and when the width of the damming body increases, the rate of wrinkling increases.
Therefore, the durability as well as the commercial value decrease
In addition, bonding work efficiency tends to be low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0044] figure 2 A first embodiment of a sound absorbing body material is shown, wherein the sound absorbing body is in an unstressed state not yet bonded, and the surface 20 to be bonded (hereinafter referred to as the joint surface 20) is convexly curved to resemble the inner surface The curvature of TS so as to closely fit the inner surface TS.

[0045] If the maximum width W of the sound absorber is close to the width between the toes 4E, it will be difficult to insert the sound absorber material into the inner cavity of the tire and the bonding work efficiency will become low. Therefore, the width W is preferably set to be not more than 80% of the axial width Wt between the toes 4E.

no. 2 example

[0047] If the joint surface 20 has an uncurved portion or a flat portion, the width of the flat portion must not be greater than 30% of the tread width along the tread surface 2s. If it is more than 30%, the above-mentioned problems such as wrinkles are prone to occur.

[0048] Such as image 3 As shown, if the joint surface 20 is flat as a whole, the width W of the muffler material must not be greater than 30% of the tread width TW. In this case, since the width W is relatively narrow, its thickness H is not less than 5.0 mm, preferably at least 0.6 times the width W, in order to obtain a sufficient noise reduction effect.

no. 3 example

[0050] If the joint surface 20 of the muffler material used is not curved or flat, and the width W is greater than 30% of TW, then as Figure 4 As shown, each axial edge 11e must be provided with regularly spaced V-shaped grooves 24 along its length.

[0051] In spite of the grooves, if the width W exceeds 90% of TW, it is also difficult to completely prevent wrinkles and edge irregularities because the bonding work becomes difficult. Therefore, the width W is preferably not greater than 90%, more preferably less than 75%, of the tread width TW.

[0052] The groove 24 extends from the side 11e of the muffler material to its centerline N while reducing the gap (k) between the opposite edges 24e of the groove and at an axial distance Ye from the side 11e in front of the centerline N termination. Thus, the muffler body 11 has a continuous central portion Yc between the axially inner ends of the grooves 24 and side portions Ye separated by the grooves 24 .

[0053] If the width...

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Abstract

A pneumatic tire of which tread portion is curved so that a tread face has a radius of curvature in a range of from 50 to 220 mm, is provided with a noise damper. The noise damper having a joint surface adhered to the radially inner face of the tread portion, is provided with one of the following three designs: (1) the joint surface is curved to fit to the radially inner face of the tread portionand has a width; (2) the joint surface is substantially straight and has a width not more than 30 % of the width of the tread face measured along the tread face; and (3) the joint surface is substantially straight and has a width more than 30 % of the width of the tread face measured along the tread face, and each side edge of the noise damper is provided along the length thereof with notches.

Description

field of invention [0001] The present invention relates to low noise pneumatic tires, and more particularly to the combination of a pneumatic tire having a circular tread profile and a sound dampening body bonded to the radially inner surface of the tread portion. Background technique [0002] Typically, off-road motorcycle tires are provided with a tread pattern based on a large negative ratio of tread blocks and / or lugs, and inevitably generate large noises during running on well-paved roads. Also, motocross bikes are often quite loud with engine noise. Therefore, there is insufficient demand for low-noise tires in this type of tire. [0003] However, for road motorcycle tires, since motorcycles of so-called "big scooter" in which engine noise, mechanical noise, and wind noise are all reduced like cars have become popular in recent years, low-noise tires demand gradually increased. [0004] Compared to motocross tires, road motorcycle tires have a relatively small negat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C19/00
CPCB60C19/002Y10T152/10495
Inventor 汤川直树
Owner SUMITOMO RUBBER IND LTD
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