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Run flat tire

A run-flat tire and bead technology, which is applied in the direction of pneumatic tires, reinforcement layers of pneumatic tires, special tires, etc., can solve the problems of detachment of bead parts, weakening of extrusion pressure, and reduction of tire fitting force, and achieve suppression Bead shedding, suppression of vibration amplitude, and reduction of road noise

Inactive Publication Date: 2009-07-22
TOYO TIRE & RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when running in a run-flat state (run-flat running), the pressing pressure on the rim of the bead portion is weakened, and the fitting force of the tire is reduced, so there is a problem that the bead portion is easily detached from the rim.

Method used

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Examples

Experimental program
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Effect test

Embodiment approach

[0049] (1) In the above-mentioned embodiment, the case where the positions of the winding ends of the carcass layer are the same on both sides is exemplified. However, in the present invention, the winding part of the carcass layer extends to the high turn-up of the sidewall part. The structure is only applicable to the sidewall portion arranged on the outside of the vehicle, and thus an asymmetric rigid structure may be formed.

[0050] Such as figure 2 As shown, with this structure, the winding end of the carcass layer 5 arranged on the outside of the vehicle is located further outward in the tire radial direction than the inside of the vehicle, and the carcass is arranged only on the sidewall portion 2a arranged on the outside of the vehicle. The wound portion of the layer 5, therefore, the sidewall portion 2a has a higher rigidity than the sidewall portion 2b. In this example, the winding end of the carcass layer 5 arranged on the outside of the vehicle reaches the end of the ...

Embodiment

[0055] Hereinafter, an embodiment concretely showing the structure and effects of the present invention will be described. As evaluation items of the examples, etc., bead shedding resistance, road noise level, and operation stability were used, and the following evaluations were made.

[0056] (1) Bead shedding resistance

[0057] The test tire was installed on the front left side of the actual vehicle (a 3000cc FR car made in Japan), and it turned right from a straight road into a circular road with a radius of 20m to perform a so-called J-turn. At this time, the internal pressure of the test tire was 0 kPa, and the bead shedding resistance was evaluated at the running speed when the bead shedding occurred. Starting from a driving speed of 25km / h, drive in increments of 5km / h until the bead falls off. The comparative example is taken as 100 for index evaluation. The larger the value, the faster the running speed when bead falling occurs, that is, the better the bead falling resis...

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Abstract

A run flat tire includes a pair of bead portions (1) having annular beads (1a), a carcass layer (5) placed between the bead portions (1) with each end portion of the carcass layer wound around the bead (1a), sidewall portions (2a, 2b) each extending radially outward of the tire from the bead portion (1), reinforcing rubber layers (9a, 9b) having a substantially crescent cross-section and arranged at the sidewall portions (2a, 2b), on the inner side of the carcass layer (5), and a tread portion (4) for connecting the ends on the outer peripheral sides of the sidewall portions (2) through shoulder portions (3). The run flat tire has an asymmetric rigidity structure where the rigidity of the sidewall portion (2a) on the outboard side of a vehicle is higher than the rigidity of a sidewall portion (2b) on the inboard side of the vehicle.

Description

Technical field [0001] The invention relates to a self-supporting run-flat tire with a reinforced rubber layer arranged on the sidewall portion. Background technique [0002] In related runflat tires, a reinforced rubber layer is used to support the tire whose internal pressure is reduced due to a puncture or the like (flat state), thereby suppressing flattening, and being able to travel a certain distance safely , For example to be able to reach the nearest service facility. However, when running in a flat state (flat running), since the pressing pressure on the rim of the bead portion is weakened, the fitting force of the tire is reduced, and therefore, there is a problem that the bead portion is easily separated from the rim. [0003] In addition, as a problem different from the above-mentioned bead falling problem, it is known that noise called road running noise is generated in the car. The road noise is when the tires are vibrated due to the unevenness of the road surface w...

Claims

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Application Information

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IPC IPC(8): B60C17/00B60C9/08B60C5/00B60C13/00
CPCB60C19/001B60C17/00B60C3/06B60C15/0045B60C17/0009
Inventor 濑川政弘花和孝
Owner TOYO TIRE & RUBBER CO LTD
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