EP0206679A2
Expired / Lapsed
EP
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Reinforced bead structure for heavy duty tyre
Assignee: Sumitomo Rubber Industries Ltd
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Filing: 1986-06-13
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Granted: —
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Expires: 2006-06-13
Abstract
Abstract The invention relates to a pneumatic radial ply tyre for heavy duty vehicle such as truck, bus, etc; having an improved reinforcing structure for bead portion. The tyre comprises: a carcass ply (2) of a radial or semi-radial arrangement; a metallic cord reinforcing layer (4) disposed at the axially outside of the turned up portion (2') of the carcass ply (2); an inside reinforcing layer (7) composed if fibre cords and disposed along the inside of the main portion of the carcass ply (2), and the outside reinforcing layer (6) composed of fibre cords and arranged along the outside of the metallic cord reinforcing layer (4) and the turned up portion (2'). The above components satisfy the below equations: (0.5h1>h2>0.9h1), (h2>h4), (3.Oh1>h3>1.3h1), (3.0h1 >h3'>0.5h1), and (h3'>h4) where h 1: height of the outer end (2a) of the turned up portion (2') h2: height of the outer end (4a) of the metallic cord reinforcing layer (4) h3: height of the outer end (6b) of the outside reinforcing layer (6) h3': height of the outer end (7a) of the inside reinforcing layer (7) h4: height of the outer end (4b) of the turned up portion (4') of the metallic reinforcing layer (4).
Inventors
- 👤 Kazuhiko Hounen-Nishi Syataku Rm. No. 13 Kawamura
- 👤 Kazuo Sato
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 23:41
CPC Classifications
B; B60; B60C; B60C15/00; B60C15/06; B60C15/0603; B60C15/0607; B60C2015/0617; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10819; Y10T152/10828; Y10T152/10837; Y10T152/10846
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
315 words
A radial tyre for heavy duty use comprising a metal cord fabric 0 carcass ply (2) having its cords at angles of 60 to 90° to the tyre equatorial line of the cords of the cords turned up around bead cores (3) to form ply turn up portions (2') characterised by in each bead a rubberised metal cord reinforcing layer (4) along and adjacent to th ply (2) and ply turn up portion (2') such that on the outside of the bead the height (h2) of the radially outer edge (4c) is 0.5 to 0.9 times the height (hl) of the turned up portion edge (2a) and on the inside of the bead the height (h4) of the radially outer edge (4b) is less than the height (h2) of the radially outer edge (4a), an outside reinforcing layer (6) of rubberised organic cord fabric which extends along and adjacent to the axially outer side of the metal cord reinforcing layer (4) radially inwards from a height (h3) which is 1.3 to 3.0 times the height (hl) of the turned up edge (2a) to overlie and cover both cords (2a and 4a) of the turned up carcass ply (2') and the metal reinforcing layer (4) and on inside reinforcing layer (7) of rubberised fibre cord fabric which extends along and adjacent to the axially inner side of the carcass ply (2), the height (h3') of the radially outer cord (7a) of the inside reinforcing layer (7) being 0.5 to 3.0 times the height (hl) of the turned up edge (2a) and in addition being greater than the height (h4) of the radially outer end (4a) of the metal reinforcing layer (4) and the radially inner end (7b) of the inside reinforcing layer (7) being interposed between the main portion of the carcass ply (2) and the turned up portion (4') of the metal reinforcement layer (4).
Claim 2
Dependent Claim
315 words
A radial tyre for heavy duty use comprising a metal cord fabric 0 carcass ply (2) having its cords at angles of 60 to 90° to the tyre equatorial line of the cords of the cords turned up around bead cores (3) to form ply turn up portions (2') characterised by in each bead a rubberised metal cord reinforcing layer (4) along and adjacent to th ply (2) and ply turn up portion (2') such that on the outside of the bead the height (h2) of the radially outer edge (4c) is 0.5 to 0.9 times the height (hl) of the turned up portion edge (2a) and on the inside of the bead the height (h4) of the radially outer edge (4b) is less than the height (h2) of the radially outer edge (4a), an outside reinforcing layer (6) of rubberised organic cord fabric which extends along and adjacent to the axially outer side of the metal cord reinforcing layer (4) radially inwards from a height (h3) which is 1.3 to 3.0 times the height (hl) of the turned up edge (2a) to overlie and cover both cords (2a and 4a) of the turned up carcass ply (2') and the metal reinforcing layer (4) and on inside reinforcing layer (7) of rubberised fibre cord fabric which extends along and adjacent to the axially inner side of the carcass ply (2), the height (h3') of the radially outer cord (7a) of the inside reinforcing layer (7) being 0.5 to 3.0 times the height (hl) of the turned up edge (2a) and in addition being greater than the height (h4) of the radially outer end (4a) of the metal reinforcing layer (4) and the radially inner end (7b) of the inside reinforcing layer (7) being interposed between the main portion of the carcass ply (2) and the turned up portion (4') of the metal reinforcement layer (4).
Claim 3
Dependent Claim
58 words
A tyre according to claim 1 characterised in that the height (h4) of the radially outer cord (4b) of the turned up portion of the metal reinforcing layer (4) on the inside of the bead is 0.3 to 0.8 times the height (hl) of the outer end (2a) of the turned up portion of the carcass ply (2).
Claim 4
Dependent Claim
32 words
A tyre according to claim 1 or 2 characterised by the cords the inside reinforcing layer (7) comprising cords having an initial modulus of elasticity of 700 to 15000 kgf/mm 2 .
Claim 5
Dependent Claim
38 words
A tyre according to claim 1,2 or 3 charcaterised by the cords of the inside reinforcing layer (7) being laid across the 0 0 cords of the carcass ply (2) at an angle of 30 to 80 .
Claim 6
Dependent Claim
123 words
A tyre according to claim 1,2,3, or 4 characterised by a bead apex (SE) comprising rubber material disposed between the main portion (2) and turned up portion (2') of the carcass ply, the apex extending radially outwardly from the bead core (3), tapering and comprising two components (11,12) the first (11) of hard rubber with a modulus of elasticity of 60 - 150 kgf/cm 2 at 100% 0 elongation and a JIS (A) hardness of 70 or more and the second (12) of soft rubber being adjacent to but axially outward of the first (11) and comprising rubber having a modulus of elasticity of 10 to 45 kgf/cm at 100% elongation and a JIS (A) hardness of 0 0 45 to 65 .
Claim 7
Dependent Claim
70 words
A radial tyre according to claim 1,2,3 or 4 characterised by a bead apex (SE) comprising rubber material disposed beteen the main portion (2) and turned up portion (2') of the carcass ply, the apex (SE) extending radially outwardly from the bead base, tapering and comprising soft rubber compound having a modulus of elasticity of 10 to 45kgf/cm at 100% elongation and JIS (A) hardness of 45° to 65° 3
References Cited (Backward Citations)
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