EP0297889A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Pneumatic tyre
Assignee: Sumitomo Rubber Industries Ltd
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Filing: 1988-06-30
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Granted: —
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Expires: 2008-06-30
Abstract
Abstract A pneumatic tyre comprising a pair of bead cores (2), a carcass (3) turned up at both edges around said bead cores (2), a tread disposed on the carcass (3) a breaker belt (4) comprising at least two plies (4A,4B) of steel cords disposed radially outside the carcass (3) characterised by a pair of inner bands (5) disposed between the carcass (3) and the belt (4) each band comprising stretchable cords of organic fibres the inner band cords being laid substantially parallel to the tyre equator, and the axially outer edge (d) of the inner bands (5) and the edges (a) of the widest ply of the belt (4) being substantially adjacent to one another.
Inventors
- 👤 Kenji Takehara
- 👤 Yoshiyuki Takada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 11:28
CPC Classifications
B; B60; B60C; B60C3/00; B60C3/04; B60C11/00; B60C11/0083; B60C11/03; B60C11/0327; B60C11/0332; B60C9/00; B60C9/18; B60C9/20; B60C9/2003; B60C9/2009
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
114 words
A pneumatic tyre comprising a pair of bead cores (2), a carcass (3) turned up at both edges around said bead cores (2), a tread disposed on the carcass (3), a breaker belt (4) comprising at least two plies (4A, 4B) of steel cords disposed radially outside the carcass (3) characterised by a pair of inner bands (5) disposed between the carcass (3) and the belt (4), each band (5) comprising stretchable cords of organic fibres the inner band cords being laid substantially parallel to the tyre equator, and the axially outer edge (d) of the inner bands (5) and the edges (a) of the widest ply of the belt (4) being substantially aligned.
Claim 2
Dependent Claim
114 words
A pneumatic tyre comprising a pair of bead cores (2), a carcass (3) turned up at both edges around said bead cores (2), a tread disposed on the carcass (3), a breaker belt (4) comprising at least two plies (4A, 4B) of steel cords disposed radially outside the carcass (3) characterised by a pair of inner bands (5) disposed between the carcass (3) and the belt (4), each band (5) comprising stretchable cords of organic fibres the inner band cords being laid substantially parallel to the tyre equator, and the axially outer edge (d) of the inner bands (5) and the edges (a) of the widest ply of the belt (4) being substantially aligned.
Claim 3
Dependent Claim
128 words
A tyre according to claims 1 characterised in that the tread (T) has a tread surface comprising a inner arc part (T1) with a radius of curvature TR1 and two outer arc parts (T2) each with a radius of curvature TR2, the ratio TR2/TR1 of said radii is in the range of 0.15 to 0.45 when the tyre (1) is mounted on a standard rim and inflated to 5% of the standard pressure, and each border P, between said inner arc part (T1) and said outer arc parts (T2) is located in a region extending axially outwardly from the axially inner edge of each inner band (5) to the axially outer edge of the overlapping region where said at least two plies of said belt (4) are overlapped.
Claim 4
Dependent Claim
35 words
A tyre according to claims 1 or 2, characterised in that the belt (4) comprises two plies (4A, 4B) of steel cords and the radially inner ply (4A) is wider than the outer ply (4B).
Claim 5
Dependent Claim
39 words
A tyre according to claims 1,2 or 3 characterised in that the width W5 of each inner band (5) is in the range of 15 to 40% of the width W4 of the widest ply of said belt (4).
Claim 6
Dependent Claim
43 words
A tyre according to claims 1,2,3 or 4 characterised in that the tread portion, of the tyre includes at each edge a cushion (13) of soft rubber disposed between the axially outer edge regions of the inner bead (5) and the carcass (13).
Claim 7
Dependent Claim
73 words
A tyre according to claims 1,2,3,4 or 5 characterised by a pair of outer bands (6) made of stretchable organic fibre cords both disposed radially outside the belt (4), the width W6 of each outer band (6) being in the range of 15 to to 40% of the width W4 of the widest ply of the belt (4), and the width W6 is smaller than the width W5 of the inner band (5).
Claim 8
Dependent Claim
46 words
A tyre according to claims 1,2,3,4, or 5, characterised by an outer band (6) made of stretchable organic fibre cords disposed radially outside said belt (4), and having has a width substantially the same as the width W4 of the widest ply of said belt (4).
Claim 9
Dependent Claim
23 words
A tyre according to any one of claims 1 to 7 characterised in that the organic fibre cord is a heat shrinkable cord.
References Cited (Backward Citations)
No citation records indexed.
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