EP0158539A2
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EP
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Pneumatic radial tires for passenger cars
Assignee: Bridgestone Corp
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Filing: 1985-04-09
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Granted: —
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Expires: 2005-04-09
Abstract
Abstract A pneumatic radial tire for passenger car having an improved riding comfort against vibration without substantially degrading the cornering stability is disclosed, which comprises a bead filler disposed between the carcass and its turnup, at least a part of which has a complex modulus of elasticity of 1×10 8 ~ 8×10 8 dyn/cm 2 and a sin δ of not less than 0.28 under a strain energy of 10 4 dyn/cm 2 .
Inventors
- 👤 Hideo Hara
- 👤 Motonori Bundo
- 👤 Yoshihiro Makino
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 13:12
CPC Classifications
B; B60; B60C; B60C15/00; B60C15/06; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10819; Y10T152/10837; Y10T152/10846
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
98 words
In a pneumatic radial tire for passenger car comprising a carcass of a radial ply cord structure wound around each of bead cores from inside toward outside to form a turnup, and a bead filler disposed just above the bead core between the carcass and the turnup thereof, the improvement wherein at least a part of the bead filler is composed of a rubber composition having a complex modulus of elasticity of 1×10 8 ~8×10 8 dyn/cm 2 and a sin 6 of not less than 0.28 under a strain energy of 10 4 dyn/c m 2 .
Claim 2
Dependent Claim
98 words
In a pneumatic radial tire for passenger car comprising a carcass of a radial ply cord structure wound around each of bead cores from inside toward outside to form a turnup, and a bead filler disposed just above the bead core between the carcass and the turnup thereof, the improvement wherein at least a part of the bead filler is composed of a rubber composition having a complex modulus of elasticity of 1×10 8 ~8×10 8 dyn/cm 2 and a sin 6 of not less than 0.28 under a strain energy of 10 4 dyn/c m 2 .
Claim 3
Dependent Claim
21 words
The pneumatic radial tire according to claim 1, wherein the complex modulus of elasticity is 3×10 8 ~ 7×10 8 dyn/cm2.
Claim 4
Dependent Claim
14 words
The pneumatic radial tire according to claim 1, wherein the sin δ is 0.30~0.50.
Claim 5
Dependent Claim
14 words
The pneumatic radial tire according to claim 3, wherein the sin δ is 0.32~0.45.
Claim 6
Dependent Claim
22 words
The pneumatic radial tire according to claim 1, wherein the bead filler is composed of hard rubber stock and soft rubber stock.
Claim 7
Dependent Claim
45 words
The pneumatic radial tire according to claim 5, wherein the soft rubber stock has a complex modulus of elasticity of 1×10 8 ~8×10 8 dyn/cm 2 and a sin 6 of not less than 0.28 under a strain energy of 10 4 dyn/cm 2 .
Claim 8
Dependent Claim
36 words
The pneumatic radial tire according to claim 5, wherein the difference in complex modulus of elasticity between hard rubber stock and soft rubber stock is E* (hard) - E* (soft) ≥ 3×10 8 dyn/cm 2 .
References Cited (Backward Citations)
No citation records indexed.
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