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Run flat tire

A technology for run flat tires and tires, which is applied to the reinforcement layer of pneumatic tires, tire parts, tire tread/tread pattern, etc., and can solve the problems of increasing tire weight, etc.

Inactive Publication Date: 2009-07-08
TOYO TIRE & RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] As a countermeasure against high-frequency road running noise, as described in the following patent documents 6 and 7, it is known to increase the rubber thickness of the antinode portion of the tire vibration, or to provide a dense member at this portion to suppress the vibration amplitude. Any method has the problem of greatly increasing the weight of the tire

Method used

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no. 1 approach

[0055] figure 1 It is a tire meridian sectional view showing the run flat tire according to the first embodiment of the present invention when mounted on a standard rim. figure 2 is showing figure 1 A developed view of an example of a tread pattern of a mid-runner flat tire.

[0056] Such as figure 1 As shown, the run flat tire of the present invention has: a pair of bead portions 1; sidewall portions 2 extending from the bead portions 1 to the radially outer side of each tire; and the outer peripheries of the sidewall portions 2 connected by shoulder portions 3 The tread portion 4 between the side ends.

[0057] The bead portion 1 is provided with: a bead 1 a (corresponding to the first bead) in which a bead wire bundle formed of, for example, steel wire forms a ring shape in the tire circumferential direction; and a bead filler 15 . The end portion of the carcass 5 is rolled back and stopped by the bead 1a, whereby the tire is firmly fitted and attached to the rim 8 in ...

Embodiment 1-1～1-2

[0092] Experimental tires were manufactured as follows: figure 1 The structure shown (but only one kind of tread rubber is used) and as figure 2 The pattern shown has the bending stiffness of the belt layer and the rubber hardness (PAD hardness) of the reinforcing rubber layers on both sides shown in Table 1, and furthermore, the maximum difference in thickness of the reinforcing rubber layers on both sides is 0mm, and the vehicle outer side Void ratio / vehicle inner void ratio=1, tread rubber hardness is 68°, and size is 245 / 40R18. The evaluation results are shown in Table 1 together.

Embodiment 2-1～2-5

[0101] Experimental tires were manufactured as follows: figure 1 The structure shown (but only one kind of tread rubber is used) and as figure 2 The pattern shown in Table 2 has the bending stiffness of the belt layer, the rubber hardness (PAD hardness) of the reinforcing rubber layer on both sides, the tread rubber hardness, the void ratio of the vehicle outer side / the void ratio of the vehicle inner side, and further , so that the difference between the maximum thickness of the reinforced rubber layer on both sides is 0mm, and the size is 245 / 40R18. The evaluation results are shown in Table 2 together.

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Abstract

A run flat tire having reinforced rubber layers (9a, 9b) disposed in the side wall parts has an annular swollen part (10) and an annular second bead (1b). The annular swollen part (10) is formed on the outer side, in the lateral direction of the tire, of a bead part (1) disposed on the outer side of a vehicle, and has an inner peripheral surface (11) facing the outer peripheral curved surface of a rim flange when a specified rim is installed on the tire. The annular second bead (1b) is disposed in the annular swelled part (10). Both the reinforced rubber layers (9a, 9b) disposed on both sides have a rubber hardness in the range from 65 DEG to 82 DEG . Belt layers (7) disposed on the lower side of the tread part (4) have longitudinal bending rigidity in the range from 0.9 to 2.1 10N.m.

Description

technical field [0001] The present invention relates to a so-called sidewall-reinforced run-flat tire in which a reinforcing rubber layer is provided on a sidewall portion. Background technique [0002] Conventionally, sidewall-reinforced run-flat tires are known in which a reinforcing rubber layer is provided on a sidewall portion. In the run-flat tire, when the internal pressure of the tire drops due to a failure such as a flat, the tire is supported by the reinforcing rubber layer to suppress flattening of the tire, thereby enabling safe running flat. However, in a state where the air pressure inside the tire drops (a run-flat state), since the pressure of the bead portion against the rim is weakened, the fitting force with the rim is reduced, so there is a problem that the bead portion is likely to come off the rim. [0003] On the other hand, the following Patent Documents 1 and 2 disclose a tire having a first bead provided on the outer peripheral side of the rim base...

Claims

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Application Information

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IPC IPC(8): B60C17/00B60C9/18B60C9/22B60C11/00B60C11/03B60C15/02B60C15/06
Inventor 濑川政弘花和孝松山幸司
Owner TOYO TIRE & RUBBER CO LTD
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