GB2042429A
Expired / Lapsed
GB
⏱️ 0.0 years remaining
Improvements in or relating to tyres
Assignee: Pneumatiques Caoutchouc Manufacture et Plastiques Kleber Colombes SA
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Filing: 1980-01-11
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Granted: —
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Expires: 2000-01-11
Abstract
Abstract This invention relates to radial- ply tyres having a carcass 10 and crown belt 15 of the kind in which the crown belt comprises two or more superimposed layers 17-20 or pairs of layers in twisted textile cords or aromatic polyamide material arranged in more or less longitudinal directions or slightly inclined with respect to the circumferential direction. According to the invention, the aromatic polyamide cords have extension to breaking which increase from the inner layers or pairs of layers 17, 18 to the outer layers or pair of layers 19, 20 of the belt. The extension to breaking of these cords being between approximately 3 and 12%. <IMAGE>
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
GB
Data Source
google_patents
Last Synchronized
2026-10-23 01:59
CPC Classifications
B; B60; B60C; B60C9/00; B60C9/18; B60C9/20; B60C9/2003; B60C9/2009; B60C2200/00; B60C2200/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
101 words
A tyre having radial-ply carcass and crown belt, and of the kind in which the crown belt comprises two or more superimposed layers or pairs of layers in twisted textile cords of aromatic polyamide material arranged in more or less longitudinal directions or slightly inclined with respect to the circumferential direction, wherein said aromatic polyamide cords of the successive layers or pairs of layers of the belt have extension rates under load which increase from the inner layers towards the outer layers of the belt, the rates of extension to breaking of the cords being comprised between approximately 3 and 12%.
Claim 2
Dependent Claim
101 words
A tyre having radial-ply carcass and crown belt, and of the kind in which the crown belt comprises two or more superimposed layers or pairs of layers in twisted textile cords of aromatic polyamide material arranged in more or less longitudinal directions or slightly inclined with respect to the circumferential direction, wherein said aromatic polyamide cords of the successive layers or pairs of layers of the belt have extension rates under load which increase from the inner layers towards the outer layers of the belt, the rates of extension to breaking of the cords being comprised between approximately 3 and 12%.
Claim 3
Dependent Claim
37 words
A tyre as claimed in claim 1, wherein the successive layers of the belt are constituted by cords of aromatic polyamide all having the same constitution; said cords having being processed to have different rates of extension.
Claim 4
Dependent Claim
50 words
A tyre as claimed in claim 1 or 2, wherein the cords of the layers or pairs of layers of the belt have torsions which increase from the inner layers towards the outer layers of the belt, the torsion rates being comprised between approximately 200 and 400 turns per metre.
Claim 5
Dependent Claim
49 words
A tyre as claimed in claim 1, 2 or 3, wherein the belt comprises one or more additional layers of belt cords at higher extension rates comprised between 10 and 20%, these additional loads being disposed above the aromatic polyamide cord layers and under the tread of the tyre.
Claim 6
Dependent Claim
103 words
A tyre as claimed in claim 1 and comprising a crown belt constituted by two pairs of superimposed layers constituted by decitex 1 670 x 1 x 3 aromatic polyamide cords arranged in inverted direction in each pair of layers and angles of approximately 20 with respect to the circumferential direction, the course constituting the first pair of layers adjacent to the carcass having a breaking extension comprised between 3 and 5% and the cords constituting the second pair of layers having a breaking extension greater than that of the cords of the first pair of layers and comprised between 5 and 7%.
Claim 7
Dependent Claim
129 words
A tyre as claimed in claim 1, comprising a crown belt constituted by three pairs of superimposed layers constituted by cables of decitex 1 670 x 1 X 3 aromatic polyamide arranged in inverted direction in each pair of layers at angles of 20' with respect to the circumferential direction, the cords of the first pair of layers adjacent the carcass having an extension comprised between 3 and 5%, the cords of the second pair of layers having a breaking extension greater than that of the cords of the first pair of layers and comprised between 5 and 7% and cords of the third pair of layers having a breaking extension greater than that of the cords of the second pair of layers and comprised between 7 and 12%.
Claim 8
Dependent Claim
12 words
A tyre substantially as hereinbefore described with reference to the accompanying drawing.
Claim 9
Dependent Claim
12 words
A tyre substantially as hereinbefore described with reference to the accompanying drawing.
Claim 10
Dependent Claim
16 words
A tyre when made in accordance with any one of the specific Examples herein set forth.
Claim 11
Dependent Claim
16 words
A tyre when made in accordance with any one of the specific Examples herein set forth.
References Cited (Backward Citations)
No citation records indexed.
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