pneumatic tire

A technology for pneumatic tires and tires, applied in tire parts, tire edges, tire sidewalls, etc., can solve problems such as breakage, and achieve the effects of easing pressure, reducing tire weight, and maintaining zero-pressure driving durability.

Inactive Publication Date: 2016-08-24
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, in zero-pressure tires whose tire rigidity has been reduced in this way, there is a tendency to cause failures caused by rupture of the upper ply of the bead core, and it is not necessarily possible to achieve both zero-pressure driving durability and ride comfort during normal driving. There is still room for improvement in terms of driving durability and ride comfort during normal driving

Method used

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example

[0049] In pneumatic tires with tire size 235 / 50R18, press figure 2 Unify the basic tire section structure, and set the ply ply rolling height H as shown in Tables 1 to 5 T , on the imaginary line L relative to the total thickness G of the side wall T The distance G from the outer surface of the tire to the ply O The ratio of the bead filler height H relative to the tire section height SH B The ratio of the ratio, the hardness Hs of the rubber composition constituting the bead core at 20°C B , The hardness Hs of the rubber composition constituting the side wall reinforcement layer at 20°C R , The dynamic elastic modulus E' of the rubber composition constituting the bead filler at 60°C B (inner diameter side E' BI and outer diameter side E' BO ), the dynamic elastic modulus E' of the rubber composition constituting the sidewall reinforcement layer at 60°C R (inner diameter side E' RI and outer diameter side E' RO ), the tanδ value T of the rubber composition constituti...

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Abstract

The rolling height HT of the carcass (4) is set to be 10 mm or less, the distance GO from the outer surface of the tire to the carcass (4) is set to be more than 50% of the total thickness GT, and the height HB of the bead filler (6) is set to be 50% to 80% of the section height SH, the cross-sectional area ratio VB / VR of the bead filler (6) to the sidewall reinforcement layer (9) is set to 0.4 to 0.6, on the other hand, for the bead filler (6) and For the side wall reinforcement layer (9), the hardness HsB is set to 65 to 80, the hardness HsR is set to 75 to 85, the relationship between the hardness HsB and the hardness HsR is set to HsB≤HsR, and the dynamic elastic modulus E'B is set to 7.0 MPa to 15.0 MPa, dynamic elastic modulus E'R to 7.0 MPa to 15.0 MPa, tan δ value TB to 0.06 and tan δ value TR to 0.05 or less. To provide a pneumatic tire capable of achieving a high balance between ride comfort during normal running and zero-pressure running durability.

Description

technical field [0001] The present invention relates to a pneumatic tire, and more specifically, to a pneumatic tire capable of achieving a high degree of both ride comfort during normal running and zero-pressure running durability. Background technique [0002] Among pneumatic tires, there is known a sidewall-reinforced zero-pressure pneumatic tire in which a crescent-shaped reinforcing rubber layer is inserted into the inner surface of the sidewall. Based on the rigidity of the reinforced rubber layer, zero-pressure running can be performed (for example, refer to Patent Document 1). Although this kind of sidewall-reinforced zero-pressure pneumatic tire has the advantage of realizing zero-pressure running based on the tire structure without relying on supports such as cores installed on the wheel, it also has the disadvantage that the rigidity of the sidewall is higher than that of ordinary tires. , leading to the disadvantage of reduced ride comfort during normal driving....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C13/00
CPCB60C17/0009B60C2015/061B60C2017/0072B60C2017/0063B60C2013/006B60C2013/007B60C17/0027B60C17/00
Inventor 堀内研治
Owner THE YOKOHAMA RUBBER CO LTD
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