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pneumatic tire

A pneumatic tire, tire technology, applied in tire parts, tire tread/tread pattern, transportation and packaging, etc., can solve problems such as difficulty in providing tires, and achieve improved wear resistance, reduced energy loss, and groove volume. zoom out effect

Active Publication Date: 2017-09-22
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to provide tires to the extent that all performances satisfy market demands

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0060] Prototype has figure 1 The tires (tire size: 315 / 80R22.5) with the basic pattern shown and based on the specifications in Table 1 were tested.

[0061] Each test method is as follows.

[0062]

[0063] The rolling resistance of each test tire was measured using a rolling resistance testing machine. The detailed conditions are as follows. The result was shown by the reciprocal of the rolling resistance, and the value of "Example 1" was set to 100 by the index. The larger the numerical value, the better the rolling performance.

[0064] Rim: 22.5×9.00

[0065] Internal pressure: 850kPa

[0066] Longitudinal load: 33.34kN

[0067] Speed: 80km / h

[0068]

[0069] Based on the single tire noise test method specified in ECE-R117-02, the passing noise level of each test tire was measured when driving at a center speed of 70km / h. The results are represented by an index that takes the reciprocal of the passing noise level and assumes that the value of "Example 1" is ...

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Abstract

The present invention provides a pneumatic tire capable of maintaining wet road performance and improving rolling performance, low-noise performance, and wear resistance. A pneumatic tire (1) is provided with a plurality of main grooves (3) on a tread portion (2). The main groove (3) has, in a cross section perpendicular to the longitudinal direction of the groove: a first groove bottom (3A); and a pair of first groove bottoms (3A) extending smoothly from the first groove bottom (3A) to the tread (S). A ditch wall (3B, 3B). In the tread (S), the groove width (W1) between the first groove walls (3B) of the main groove (3) is 2.0 mm to 20.0 mm, from the tread (S) to the first groove bottom ( The groove depth (D) of 3A) is 10.0 mm or more, and the angle (α) [degrees] between the groove width (W1) [mm] and the first groove wall (3B) relative to the normal direction of the tread surface (S) The ratio (W1 / α) is in the range of 1.0 [mm / degree] to 2.0 [mm / degree].

Description

technical field [0001] The present invention relates to a pneumatic tire provided with a plurality of main grooves extending continuously in the tire circumferential direction on a tread portion. Background technique [0002] Conventionally, a pneumatic tire has been proposed that employs a tread pattern in which a plurality of main grooves extending continuously in the tire circumferential direction are provided on a tread portion (see, for example, Patent Document 1 below). The tread portion includes a tread rubber formed to include a cap gom layer and a base gom layer. In such tires, the thicknesses of the top rubber layer and the bottom rubber layer are respectively limited in order to achieve both wear resistance and rolling performance. [0003] In recent years, the performance display of tires has been implemented in the market. The performance of tires includes, for example, rolling performance, low-noise performance, wet performance, wear resistance, and the like,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/04B60C11/12B60C11/13
CPCB60C2011/0367B60C11/0309B60C2011/0353B60C2011/0346B60C2011/1209B60C11/1259B60C2011/0365B60C2011/0355B60C11/1272B60C11/1307B60C11/1236B60C11/0327B60C2011/0348B60C2011/036B60C2011/0388
Inventor 前原敦史
Owner SUMITOMO RUBBER IND LTD
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