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Tyre for heavy load

A technology for heavy loads and tires, applied to tire parts, tire tread/tread pattern, transportation and packaging, etc., can solve the problems of insufficient reduction of tire noise, achieve the goal of suppressing sound leakage and improving noise performance Effect

Inactive Publication Date: 2012-06-13
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, heavy-duty tires used for trucks, buses, etc. require particularly high grip, so there is a limit to the reduction of the groove volume
Therefore, tire noise cannot be sufficiently reduced

Method used

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  • Tyre for heavy load
  • Tyre for heavy load
  • Tyre for heavy load

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0057] by figure 1 Based on the tread pattern of , and based on the specifications in Table 1, a heavy-duty tire with a size of 11R22.5 was manufactured. Then, the noise performance, stone inclusion performance, drainage performance, and damage of the intermediate spacer of each test tire were tested, and the results are shown in Table 1. In addition, the height DL of the intermediate spacer is constant over the entire length, and is formed along the groove center line of the longitudinal main groove (the distance K from the groove wall is constant).

[0058] (1) Noise performance

[0059]

[0060] Install the tires on all wheels of the vehicle under the following conditions, and drive on a slippery road at a speed of 50km / h, and measure the overall noise level dB(A) at the position next to the left ear of the driver's seat.

[0061] Rims: 7.50×22.5

[0062] Internal pressure: 800kPa

[0063] Vehicle: 8-ton load 2-D vehicle (without load)

[0064]

[0065] Using the a...

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PUM

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Abstract

The invention provides a heavy load tire which provides a pair of bottom portions of longitudinal channels at two sides of the tire equator, and includes a noise-reducing middle separator extending continuously in the tire circumferential direction and projecting outwards from the bottom portions to the tire radial direction. The height (DL) of the radial direction outer end of the middle separator from the bottom portion is 1.0 to 1.08 times the depth (WL) of the longitudinal channel. The width TW of the middle separator at the radial direction outer end is 0.85 to 1.0 times the width (BW) of the middle separator at the radial direction inner end and 0.2 to 0.5 times the width (SW) of the longitudinal channel at the tire surface.

Description

technical field [0001] The present invention relates to a heavy-duty tire used for trucks, passenger cars, etc., and more specifically relates to improving the noise performance by arranging a narrow-width intermediate spacer continuously extending along the tire circumferential direction at the bottom of the longitudinal main groove heavy-duty tires. Background technique [0002] On the tread portion of a pneumatic tire, for the purpose of securing grip on wet or unpaved roads, various tread patterns are formed using tread grooves including tread grooves extending in the tire circumferential direction. The longitudinal main groove and the transverse groove intersecting it. [0003] However, such a tread pattern causes tread noise and road noise, and there is a problem of worsening tire noise. In addition, the above-mentioned tread noise is caused by the pumping sound generated by the air entering and exiting the lateral groove along with the rotation of the tire. In addi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/12B60C11/13
CPCB60C11/0309B60C11/047B60C2011/133B60C11/0318
Inventor 高桥伸吾
Owner SUMITOMO RUBBER IND LTD