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Heavy duty pneumatic tire

A technology of pneumatic tires and tires, which is applied to heavy-duty tires, off-road vehicle tires, tire parts and other directions, can solve the problems of heavy grooves and tire noises of heavy-duty pneumatic tires, and achieves reduction of pump sound, suppression of air column resonance, The effect of suppressing air column resonance

Inactive Publication Date: 2012-03-14
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the heavy duty pneumatic tire is heavy and the grooves are also deep and wide, these grooves generate tire noise

Method used

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  • Heavy duty pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0062] In order to confirm the effect of the present invention, a trial production with figure 1 The internal structure and the tire size based on the specifications in Table 1 are 275 / 80R22.5 truck and passenger car tires. And noise performance was tested on them. Also, for Figure 5 The same test was performed on the comparative tires of (a) and (b). The main common specifications are as follows, except for the parameters shown in Table 1, all others are the same.

[0063] Tread width TW: 260mm

[0064] Carcass ply number: 1 piece

[0065] Carcass cord angle: 90°

[0066] Carcass Cord Material: Steel

[0067] Number of belt plies: 4 pieces

[0068] Belt Cord Material: Steel

[0069] Rim: 22.5×7.50

[0070] The height of the partition body H1 / D1: 90-105%

[0071] Thickness t1 / W1 of the partition wall: 10 to 50%

[0072] The ratio of the outer surface of the partition body to the thickness at the bottom t1 / t1a: 20-100%

[0073] Groove width W1 of longitudinal main...

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Abstract

The present invention provides a heavy duty pneumatic tire capable of improving the noise performance by improving the shapes of isolation walls formed at the bottom portions of longitudinal main grooves and inner horizontal grooves. The heavy duty pneumatic tire comprises a tread portion provided with a pair of longitudinal main grooves (10) and inner horizontal grooves (13) extended from the longitudinal main grooves (10) to the axial inner side of the tire. The inner horizontal grooves (13) are formed at an angle (Alpha 1) of 20-40 DEG relative to the axial direction of the tire. Isolation walls (17) are provided at the bottom portions (10u) of the longitudinal main grooves (10), protrude from the bottom portions to the radial outer side of the tire and are continuously extended along the circumference of the tire. The isolation walls (17) are extended within the longitudinal main grooves (10) in a sawtooth manner and have inner end portions (17n), wherein the distance (Lm) between the isolation walls (17) and the edges (10i) of the longitudinal main grooves (10) at the axial inner side of the tire becomes minimal within the tire circumferential region (10R) of conjunctions (10c) of the longitudinal main grooves (10) and the inner horizontal grooves (13).

Description

technical field [0001] The present invention relates to a pneumatic truck tire having improved noise performance by improving the shape of a partition formed at the groove bottom of a longitudinal main groove and an inner lateral groove. Background technique [0002] Conventionally, in the tread portion of pneumatic truck tires, passenger car tires, etc., longitudinal main grooves extending in the tire circumferential direction or lateral grooves extending from the longitudinal main grooves are provided. However, since the truck pneumatic tire is heavy and the grooves are also deep and wide, these grooves generate tire noise. For example, pattern noise is generated from the lateral grooves mainly due to the pumping sound generated by the outflow of air in the lateral grooves as the tire rolls. In addition, road noise mainly composed of air column resonance generated by air passing through the vertical main groove is generated from the vertical main groove. [0003] Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/13
CPCB60C11/0309B60C19/002B60C2011/0393B60C2011/0397B60C2200/06B60C2200/14B60C11/04B60C11/11B60C11/13
Inventor 安宅郁夫岸田正宽
Owner SUMITOMO RUBBER IND LTD
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