Heavy duty pneumatic tire

一种充气轮胎、重载荷的技术，应用在轮胎零部件、轮胎胎面/胎面花纹、运输和包装等方向

Active Publication Date: 2015-07-08
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 may cause rubber peeling such as rubber chipping on the block elements that exert a large ground pressure.

Method used

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  • Heavy duty pneumatic tire
  • Heavy duty pneumatic tire
  • Heavy duty pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0043] exist figure 1 2 shows a developed view of the tread portion 2 of the heavy duty pneumatic tire (hereinafter, may be abbreviated as “tire” in some cases) according to the present embodiment.

[0044] Such as figure 1 As shown, a plurality of circumferential main grooves 3 are provided in the tread portion 2 . The circumferential main grooves 3 in this embodiment extend continuously in a zigzag shape along the tire circumferential direction.

[0045] In the present embodiment, the circumferential main groove 3 includes at least one crown main groove 3C, a pair of middle main grooves 3M, and a pair of shoulder main grooves 3S.

[0046] A crown main groove 3C is provided on both sides of the tire equator C respectively. Each shoulder main groove 3S extends at a position closest to the tread edge Te. Each middle main groove 3M extends between the crown main groove 3C and the shoulder main groove 3S. Thus, a plurality of land portions 4 are defined in the tread portion 2 ...

no. 2 approach

[0089] Next, based on Figure 8 A second embodiment of the present invention will be described. In the description of the second embodiment, it should be noted that the same reference numerals are attached to the same or common elements described in the first embodiment, and detailed description thereof will be omitted.

[0090] Figure 8 A developed view showing the tread portion 2 of the second embodiment, Figure 9 show Figure 8 The partial enlarged view of the E-E line section of , Figure 10 show Figure 8 A partial enlarged view of the vicinity of the middle land in Figure 11 show Figure 10 An enlarged view of the F-F line section of . also, Figure 10 The cross-sections of the BB line, CC line and D-D line in the Figure 5 , Figure 7 as well as Figure 6 shown in .

[0091] Such as Figure 8 ~ Figure 10 As shown, in the present embodiment, the first connecting portion 10 and the second connecting portion 11 are provided in the middle main groove 3M.

...

no. 3 approach

[0105] exist Figure 15 ~ Figure 18 A third embodiment of the present invention is shown in . In the description of the third embodiment, it should be noted that the same or common elements described in the first embodiment and the second embodiment are assigned the same reference numerals, and detailed description thereof will be omitted.

[0106] Figure 16 show Figure 15 J-J line sectional view of the tread portion 2 in . Such as Figure 16 As shown, the tire of the present embodiment includes: a carcass 14 ; and a belt layer 15 disposed outside the carcass 14 in the tire radial direction.

[0107] The carcass 14 has a carcass ply 14 a extending from the tread portion 2 to the bead portion (not shown) via the sidewall portion 13 . The carcass 14 in this embodiment is constituted by, for example, one carcass ply 14a. The carcass ply 14a includes, for example, a plurality of carcass cords arranged obliquely at an angle of 80° to 90° with respect to the tire circumferen...

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PUM

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Abstract

A heavy duty pneumatic tire includes a tread portion 2 provided with circumferentially extending zigzag shaped main grooves 3 , a plurality of land portions 4 separated by the main grooves, and a plurality of lateral grooves 5 to form a plurality of block elements 6 on each land portion. Each land portion comprises a number of pitches P in a range of from 40 to 50, wherein each pitch consists of one block element and one lateral groove adjacent to the concerned block element. Each block element has a length in a range of from 85% to 95% of a length of the pitch. The main grooves include a crown main groove 3C , a shoulder main groove 3S , and a middle main groove 3M . The middle main groove has a zigzag amplitude MW1 larger than those of the crown main groove CW1 and the shoulder main groove SW1 .

Description

technical field [0001] The present invention relates to a heavy-duty pneumatic tire capable of improving fuel-saving performance and rubber chipping resistance. Background technique [0002] Conventionally, a heavy-duty pneumatic tire excellent in water drainage has been proposed in which a plurality of circumferential main grooves, a plurality of lateral grooves, and a plurality of block elements are provided in a tread portion (see, for example, Patent Document 1 below). [0003] Patent Document 1: Japanese Unexamined Patent Publication No. 2006-315579 [0004] However, a tire having a plurality of lateral grooves has low tread portion circumferential rigidity. With such a tire, a large energy loss occurs in the rubber portion due to a large deformation of the tread portion upon contact with the road surface, and thus tends to have unsatisfactory fuel-saving performance. [0005] In order to improve the fuel-saving performance, the following technical solution has been t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/03B60C11/13
CPCB60C11/033B60C11/13B60C2011/0355B60C11/12B60C11/125B60C2011/0346B60C11/0309B60C11/1369
Inventor 冈部太郎五十岚诚西实
Owner SUMITOMO RUBBER IND LTD
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