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Pneumatic tires for trucks

A technology of pneumatic tires and tires, which is applied in the direction of heavy tires, tire parts, tire treads/tread patterns, etc., and can solve problems such as rubber defects and defects

Active Publication Date: 2015-11-11
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, although the above-mentioned pneumatic tire for trucks has partially improved the anti-running performance, there is still room for further improvement.
[0008] In addition, in the above-mentioned tread portion provided with small grooves, since the rigidity of the blocks or ribs between the small grooves and the tread ground contact end is too small, there is also a rubber defect that is likely to cause rubber defects in the blocks or ribs. such problem

Method used

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  • Pneumatic tires for trucks
  • Pneumatic tires for trucks

Examples

Experimental program
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Effect test

Embodiment

[0090] made into figure 1 The tires having the basic structure shown in Table 1 and the shoulder land portions shown in Table 1 were evaluated for their performance. And, as a comparison, for having Figure 6 The same evaluation was performed on the tire of the shown shoulder land portion (Comparative Example 4). Among them, the common specifications are as follows.

[0091] Tire size: 11R22.5

[0092] Rim size: 22.5×7.50

[0093] Tread half width 0.5TW: 121mm

[0094] Shoulder main groove:

[0095] Groove width E1: 7.9mm

[0096] Groove depth D1: 20.6mm

[0097]Ratio (E1 / 0.5TW): 6.53%

[0098] Ratio (D1 / 0.5TW): 17.02%

[0099] Medial and lateral central auxiliary groove:

[0100] Groove width E2: 2.0mm

[0101] Groove depth D2: 12.0mm

[0102] Ratio (E2 / 0.5TW): 1.7%

[0103] Ratio (D2 / 0.5TW): 9.9%

[0104] Medial and lateral central transverse grooves:

[0105] Groove width E3: 6.2mm

[0106] Groove depth D3: 14.5mm

[0107] Ratio (E3 / 0.5TW): 5.12%

[0108] ...

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Abstract

The invention provides a high-capacity inflatable tire, which is capable of preventing rubber loss and damage and improving the nibbling performance. A tread part (2) of the high-capacity inflatable tire (1) has a main groove (3) and a land portion (4). The main groove (3) comprises a tire-shoulder main groove (3A). The land portion (4) comprises a central land portion (4A) and a tire-shoulder land portion (4B). The central land portion (4A) is spacedly provided with central pattern blocks (7). A tire-shoulder auxiliary groove (9) and a tire-shoulder transverse groove (10) are formed on the tire-shoulder land portion (4B). The tire-shoulder auxiliary groove (9) comprises an outer tire-shoulder auxiliary groove (9A) and an inner tire-shoulder auxiliary groove (9B). The tire-shoulder transverse groove (10) comprises an inner portion (10A), a central portion (10B) and an outer portion (10C). The tire-shoulder land portion (4B) is spacedly provided with an inner tire-shoulder pattern block row (11A), a central tire-shoulder pattern block row (11B) and an outer tire-shoulder pattern block row (11C). The spacing distance (P2) between the inner portion (10A), the central portion (10B) and the outer portion (10C) is smaller than the spacing distance (P1) of a central transverse groove (6).

Description

technical field [0001] The present invention relates to a pneumatic tire for heavy loads capable of suppressing rubber chipping and improving anti-running performance. Background technique [0002] In general, a pneumatic tire for heavy trucks is used under high internal pressure and high load conditions. Therefore, for example, a multi-layered belt layer using metal cords is provided on the tread portion to increase the rigidity of the entire tread portion. [0003] In such a pneumatic tire for heavy duty, the shoulder region of the tread portion cannot sufficiently absorb the impact of collision with a rut, and a so-called yaw phenomenon tends to occur in which the steering wheel becomes difficult to control. [0004] In particular, in recent years, in pneumatic tires for trucks, so-called widening of the tread, in which the tread contact width is increased to improve the wear life, has been progressing. This widening of the tread tends to deteriorate the anti-running per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/03
CPCB60C11/1392B60C11/01B60C11/11B60C11/1259B60C2011/0348B60C2011/0353B60C2011/0355B60C2011/0369B60C2011/1209B60C2200/06
Inventor 田中聪
Owner SUMITOMO RUBBER IND LTD
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