EP0194108A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A pneumatic radial tyre having a new carcass profile
Assignee: Sumitomo Rubber Industries Ltd
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Filing: 1986-02-28
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Granted: —
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Expires: 2006-02-28
Abstract
Abstract A pneumatic radial tyre having a new carcass profile which is characterised in that radius TR1 of the radially outer tread surface when the tyre is mounted on the rim officially specified for use and inflated with air at 5% of the specified maximum pressure, and the radius TR2 of curvature when the tyre is inflated with air to the specified maximum pressure satisfy the relationship 1.2 TR2/TR1 1.5, and the above mentioned radius of curvature increases with increasing air pressure.
Inventors
- 👤 Akihiro Takeuchi
- 👤 Kouichi Horiuchi
- 👤 Kiyoshi Ochiai
- 👤 Hideaki Yoshikawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 09:44
CPC Classifications
B; B60; B60C; B60C3/00; B60C3/04; B60C11/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
168 words
1 A pneumatic radial ply tyre which comprises a tread reinforced with a carcass layer composed of at least a single layer of ply (1) consisting of non-extensible or low-extensible cords substantially radially arranged in parallel with each other and a belt layer between the ply and the tread composed of at least two layers of plies each consisting of parallel cords laid at a comparatively small degree of angle with respect to the circumferential direction of the tyre and each ply having its cords arranged crosswise to adjacent plies characterised in that the radius of curvature (TRl) of the radially outer surface of the tread when said tyre is mounted on the rim officially specified for the tyre and inflated with air to 5% of the specified maximum pressure and the radius TR2 of curvature when the tyre is inflated with air to the specified maximum pressure satisfy the relationship 1.2 ≤ TR2/TR1 ≤ 1.5, and the said radius of curvature increases with increase in air pressure.
Claim 2
Dependent Claim
168 words
1 A pneumatic radial ply tyre which comprises a tread reinforced with a carcass layer composed of at least a single layer of ply (1) consisting of non-extensible or low-extensible cords substantially radially arranged in parallel with each other and a belt layer between the ply and the tread composed of at least two layers of plies each consisting of parallel cords laid at a comparatively small degree of angle with respect to the circumferential direction of the tyre and each ply having its cords arranged crosswise to adjacent plies characterised in that the radius of curvature (TRl) of the radially outer surface of the tread when said tyre is mounted on the rim officially specified for the tyre and inflated with air to 5% of the specified maximum pressure and the radius TR2 of curvature when the tyre is inflated with air to the specified maximum pressure satisfy the relationship 1.2 ≤ TR2/TR1 ≤ 1.5, and the said radius of curvature increases with increase in air pressure.
Claim 3
Dependent Claim
91 words
2 A pneumatic tyre as set forth in claim 1, characterised in that the radius of curvature of the shoulder part of the carcass ply line becomes smaller with increasing air pressure and the radius curvature CR1 of the shoulder part of the carcass ply line under the pressure corresponding to 5% of the specified maximum air pressure and the radius of curvature CR2 of the said carcass ply line produced when the tyre is inflated with air to the specified maximum pressure satisfy the relationship 0.70 ≤ CR2/CR1 ≤ 0.95.
References Cited (Backward Citations)
No citation records indexed.
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