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Pneumatic tire and vehicle with pneumatic tire

A pneumatic tire and tire technology, applied in the field of run-flat tires and vehicles equipped with such tires, can solve the problems of difficult tires, difficult control, and inability to obtain sufficient tires, so as to achieve performance and improve run-flat durability Effect

Inactive Publication Date: 2009-11-18
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] (2) It is difficult to set the carcass line (the shape (line) of the tire cross-sectional direction of the skeleton fiber layer (carcass) constituting the tire outline) and the control during manufacture
[0014] Because of these disadvantages, it is more difficult than before to manufacture tires by using ordinary airbag pressure molding due to the increased degree of left-right asymmetry, it is difficult to make tires asymmetrical and it is difficult to optimize the mounting method of asymmetrical tires
Therefore, there is a problem that the effects of improving the run-flat durability and ride comfort of the sidewall-reinforced run-flat tire cannot be sufficiently obtained.

Method used

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  • Pneumatic tire and vehicle with pneumatic tire
  • Pneumatic tire and vehicle with pneumatic tire
  • Pneumatic tire and vehicle with pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0049] figure 1 It is a transverse sectional view of the pneumatic tire according to the first embodiment of the present invention. This pneumatic tire 1 is formed of a rubber layer as a whole, and includes: a tread portion 2 as a portion in contact with the road surface; A shoulder portion 3; a pair of sidewall portions 4 connected to the shoulder portion 3; and a bead portion 5 connected to the sidewall portion 4 and abutted against the wheel.

[0050] Inside the bead portion 5 are provided a bead core 6 for fixing the tire 1 to the wheel against the air pressure of the tire 1 and a filler bead 7 for increasing the rigidity of the bead portion 5 . In addition, the carcass ply 8 composed of the main body portion 8a and the turned-back portion 8b is provided in a circular shape from the crown portion 9 located on the inner side in the radial direction of the tread portion 2 through the shoulder portion 3 and the inner side of the sidewall portion 4 . It extends to the bead ...

no. 2 Embodiment approach

[0060] figure 2 It is a transverse cross-sectional view of a pneumatic tire according to a second embodiment of the present invention. In the pneumatic tire 21 of the figure, with figure 1 The same or corresponding parts, marked with figure 1 The same reference numerals as used in . The pneumatic tire 21 of this embodiment is characterized in that one of the pair of bead portions 5 ( figure 2 The left side of the figure) does not set the bead reinforcement layer 12, but sets the high elastic filler strip 22. The other components of the pneumatic tire 21 are the same as those of the first embodiment, and therefore descriptions of these components are omitted.

[0061] According to the pneumatic tire 21 of the present embodiment, since the highly elastic rubber filler 22 can suppress the sidewall portion ( figure 2 The deflection on the left side in ) improves the run-flat durability. In addition, since the reinforcing rubber layer 11 is bilaterally symmetrical with r...

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Abstract

A side-reinforced run-flat tire having increased run-flat durability and riding comfort is easily press-molded by a normal bladder. The side-reinforced run-flat tire has a tread part (2), shoulder parts (3), side wall parts (4), and bead parts (5). A bead core (6) and a bead filler (7) are installed in the bead parts (5). A carcass ply (8) is constructed from a body part (8a) and a folded part (8b), and its each lateral end is extended from a crown part (9) to the bead parts (5) through the inner sides of the shoulder part (3) and the side wall part (4), folded back around the outer surfaces of the bead cores (6) from the lateral inner side to the outer side in the lateral direction of the tire, and turned up to the radial outer side of the tire. Reinforcement rubber layers (11) are formed on the inner sides, in the lateral direction of the tire, of the side wall parts (4). A bead reinforcement layer (12) is formed on that side (on the left side in the figure) of the tire where stress is increased during run-flat traveling. Because those portions of the tire that are constructed from a rubber layer are left-right symmetric with respect to the equator, the side-reinforced run-flat tire can be easily press-molded by the normal bladder.

Description

technical field [0001] The invention relates to a pneumatic tire and a vehicle equipped with the tire, in particular to a run-flat tire capable of continuing to run in a blown state and a vehicle equipped with the tire. Background technique [0002] Among the pneumatic tires mounted on a vehicle, there is known a run-flat tire that can continue to run for a predetermined distance in the state of a blown tire even if a blowout occurs during driving. As a representative tire for extending the run-flat distance when a run-flat tire blows out (hereinafter, running in a blown-out state is called run-flat running, and the run-flat distance is called run-flat durability). sexual composition, such as Figure 4 As shown, there is a so-called sidewall-reinforced run-flat tire in which a wide reinforcing rubber layer 33 having a substantially crescent-shaped cross-sectional shape is provided on the inner side in the tire width direction of the sidewall portion 32 of the tire 31. The s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C17/00B60C5/00B60C15/06
CPCB60C3/06B60C19/001B60C17/00B60C17/0009B60C15/06
Inventor 山浦常义
Owner BRIDGESTONE CORP