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Inflatable tyre

A technology for pneumatic tires and tires, which is applied to tire parts, tire treads/tread patterns, transportation and packaging, etc. It can solve the problems of reduced drainage and reduced drainage performance, so as to ensure stability and prevent the reduction of rigidity. Effect

Active Publication Date: 2009-06-24
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of tire has the disadvantage of improving the rotation performance compared to the reduction of the drainage performance during rotation.
In particular, in the case of an RV vehicle with a high vehicle center of gravity, the ground contact area of ​​the tread portion during rotation is shifted to the outside compared with a normal car, so there is a tendency for the water drainage performance to be significantly reduced during rotation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0090] based on figure 1 The basic pattern and the specifications in Table 1 were used to trial-manufacture radial tires for cars with a size of 215 / 60R16, and various performance tests were carried out. The common specifications are as follows, and the land ratio is adjusted by adjusting the number of grooves other than the wide main groove.

[0091] Tread contact width: 167mm

[0092] Groove width of the first outer wide main groove: 12.1mm, groove depth: 8.1mm

[0093] Groove width of the second outer wide main groove: 8.4mm, groove depth: 8.1mm

[0094] Groove width of the first inner wide main groove: 9.2mm, groove depth: 8.1mm

[0095] Groove width of the second inner wide main groove: 9.0mm, groove depth: 8.1mm

[0096] Angle θ1 of outer shoulder transverse groove: 79.2 degrees

[0097] Groove Width of Outer Shoulder Transverse Groove

[0098] Gs: 4.0mm

[0099] Gs1: 3.5mm

[0100] Gs2: 5.6mm

[0101] Groove depth of outer shoulder transverse groove: 5.0mm

[...

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PUM

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Abstract

The present invention provides a pneumatic tire not reducing capacities in running and capable of improving stability and water discharge ability in rotation. A wide main groove (3) arranged on tyre face (2) is formed with external side wide main groove (4) arranged on external side zone and an internal side wide main groove (5) arranged on internal side zone (Ai). The external side wide main groove (4) comprises: a first external side main groove arranged on a position away from equatorial line (C) by tyre grounding width of 5-15% distance; a second external side main groove arranged on a position away from equatorial line by tyre grounding width of 15-28% distance; tyre shafts of the first external side main groove and the second external side main groove are provided with ribs not divided by grooves and continuously extending in circumferential direction of the tyre.

Description

technical field [0001] The present invention relates to a pneumatic tire which improves stability during rotation and water drainage without deteriorating the respective performances during straight travel. Background technique [0002] Conventionally, in a pneumatic tire with a left-right asymmetrical tread pattern specified in the vehicle assembly direction, in order to improve the spin performance, the land ratio of the vehicle outer side region relative to the tire equator is made larger than the inner land ratio (for example, refer to Patent No. Literature 1). However, such tires have a disadvantage in that improved spin performance is lowered in spin performance than water drainage performance during spin. In particular, in the case of an RV vehicle with a high vehicle center of gravity, the ground contact area of ​​the tread portion during rotation is shifted outward compared with that of an ordinary car, and therefore water drainage tends to be significantly reduced...

Claims

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Application Information

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IPC IPC(8): B60C11/117B60C11/03B60C11/13B60C11/04
Inventor 岩井义孝
Owner SUMITOMO RUBBER IND LTD
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