EP0005076A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Self-adjusting V-belt
Assignee: Mitsuboshi Belting Ltd
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Filing: 1979-04-25
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Granted: —
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Expires: 1999-04-25
Abstract
Abstract An adjustable V-bett comprises a compressive rubber layer (2) onto which an adhesion rubber layer (3) is laminated, the adhesion rubber layer (3) having a plurality of ridges (4) on a surface thereof remote from the compressive rubber layer (2) which extend transversely of the V-belt A canvas covering (5) covers the ridges (4) and the recesses defined therebetween, and is stretchable longitudinally of the V-belt. Elongate tensile portions (6) are embedded between the adhesion rubber layer (3) and the ridges (4) so that they contact portions of the canvas covering (5) which are disposed in said recesses. The tensile portions (6) extend longitudinally of the V-belt in mutually parallel, equi-spaced relation, and have a differential thermal contraction stress between 100"C and 20°C of at least 3.5g/denier. At least one ply of rubberized canvas (7) or a rubber sheet can be laminated onto a surface of the compressive rubber layer (2) remote from the adhesion rubber layer (3), and short fibres (8) can be embedded in the compressive rubber layer (2) so as to be oriented transversely of the V-belt. The V-belt is manufactured by winding the canvas covering (5), the tensile portions (6), the adhesion rubber (3a), the compression rubber (2a) and the rubberized canvas (7) in succeasion. around an outer wall of a cylindrical metal mould (11) which has circumferentially spaced protrusions (12) extending axially thereof. The tensile portions (6) are formed by spirally winding a rope-like tensile member around the mould (11), the tensile member being subjected to a thermal elongation treatment. The resultant belt blank is then pressurized and heated, causing some of the adhesion rubber (3a) to flow between the windings of the tensile member (6) and into grooves (13) defined between the protrusions (12), thereby forming the ridges (4) in the finished V-belt.
Inventors
- 👤 Hiroshi Takano
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 03:27
CPC Classifications
F; F16; F16G; F16G5/00; F16G5/04; F16G5/06; B; B29; B29D; B29D29/00; B29D29/10; B29D29/106; F16G5/16; F16G5/166
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
170 words
A V-belt comprising a compressive rubber layer (2), an adhesion rubber layer (3) laminated onto the compressive rubber layer (2), a canvas covering (5) which is disposed over a surface of the adhesion rubber layer (3) remote from the compressive rubber layer (2) and which is stretchable longitudinally of the V-belt, and elongate tensile portions (6) embedded in the V-belt and extending longitudinally thereof in substantially mutually parallel,equi-apaced relation, characterised in that said surface of the adhesion rubber layer (3) remote from the compressive rubber layer (2) has a plurality of ridges (4) thereon which extend transversely of the V-belt and which, together with the recesses therebetween are covered by the canvas covering (5), and the elongate tensile portions (6) are embedded between the adhesion rubber layer (3) and the ridges (4) so that they are in contact with portions of the canvas covering (5) which are disposed in said recesses, the tensile portions (6) having a differential thermal contraction stress between 100°C and 20°C of at least 3.5 g/denier.
Claim 2
Dependent Claim
170 words
A V-belt comprising a compressive rubber layer (2), an adhesion rubber layer (3) laminated onto the compressive rubber layer (2), a canvas covering (5) which is disposed over a surface of the adhesion rubber layer (3) remote from the compressive rubber layer (2) and which is stretchable longitudinally of the V-belt, and elongate tensile portions (6) embedded in the V-belt and extending longitudinally thereof in substantially mutually parallel,equi-apaced relation, characterised in that said surface of the adhesion rubber layer (3) remote from the compressive rubber layer (2) has a plurality of ridges (4) thereon which extend transversely of the V-belt and which, together with the recesses therebetween are covered by the canvas covering (5), and the elongate tensile portions (6) are embedded between the adhesion rubber layer (3) and the ridges (4) so that they are in contact with portions of the canvas covering (5) which are disposed in said recesses, the tensile portions (6) having a differential thermal contraction stress between 100°C and 20°C of at least 3.5 g/denier.
Claim 3
Dependent Claim
26 words
A V-belt as claimed in claim 1, wherein short fibres (8) are embedded in the compressive rubber layer (2) and are oriented transversely of the V-belt.
Claim 4
Dependent Claim
30 words
A V-belt as claimed in claim 2, wherein the short fibres (8) are present in the compressive rubber layer (2) in an amount of from 10% to 30% by weight.
Claim 5
Dependent Claim
41 words
A V-belt as claimed in claim 1, 2 or 3, wherein a surface of the compressive rubber layer (2) remote from the adhesion rubber layer (3) has laminated thereon at least one ply of rubberized canvas (7) or a rubber sheet.
Claim 6
Dependent Claim
16 words
A V-belt as claimed in claim 4, wherein the rubberized canvas (7) is a bias canvas.
Claim 7
Dependent Claim
35 words
A V-belt as claimed in claim 4 or 5, wherein the rubberized canvas (7) is stretchable and is composed of curled nylon warps which have been subjected to wooly treatment interwoven with ordinary nylon wefts.
Claim 8
Dependent Claim
41 words
A V-belt as claimed in any preceding claim, wherein the canvas covering (5) is composed of curled nylon warps (5a) which has been subjected to wooly treatment interwoven with ordinary nylon wefts (5b), the warps (5a) extending longitudinally of the V-belt.
Claim 9
Dependent Claim
57 words
A V-belt as claimed in any preceding claim, wherein the ridges (4) are provided at substantially equal intervala p along the V-belt and are of substantially equal height t, the values of p and t being related to the overall thickness d of the V-belt as follows:- 1.5t < p < 3.5t 0.12d < t < 0.4d
Claim 10
Dependent Claim
21 words
A V-belt as claimed in any preceding claim, wherein the elongate tensile portions (6) are made of polyester or polyamide fibres.
Claim 11
Dependent Claim
28 words
A V-belt as claimed in any preceding claim, wherein the adhesion rubber layer (3) and/or the compressive rubber layer (2) is or are made of heatproo f rubber.
Claim 12
Dependent Claim
32 words
ll. A V-belt as claimed in any one of claims 1 to 10, wherein the adhesion rubber layer (3) and/or the compressive rubber layer (2) is or are made of coldproof rubber.
Claim 13
Dependent Claim
28 words
A V-belt as claimed in any preceding claim, wherein the adhesion rubber layer (3) and/or the compressive rubber layer (2) is or are made of polychloroprene rubber (CR).
Claim 14
Dependent Claim
33 words
A V-belt as claimed in any one of claims 1 to 11, wherein the adhesion rubber layer (3) and/or the compressive rubber layer (2) is or are made of nitrile butadiene rubber (NBR).
Claim 15
Dependent Claim
40 words
A V-belt as claimed in any one of claims 1 to 11, wherein the adhesion rubber layer (2) and/or the compressive rubber layer (3) is or are made of a blend of polychloroprene rubber (CR) and nitrile butadiene rubber (NBR).
Claim 16
Dependent Claim
40 words
A V-belt as claimed in any one of claims 1 to 11, wherein the adhesion rubber layer (2) and/or the compressive rubber layer (3) is or are made of a blend of natural rubber (NR) and styrene butadiene rubber (SBR).
Claim 17
Dependent Claim
39 words
A V-belt as claimed in any one of claims 1 to 11, wherein the adhesion rubber layer (2) and/or the compressive rubber layer (3) is or are made of a blend of polychloroprene rubber (CR) and butyl rubber (BR).
Claim 18
Dependent Claim
23 words
A V-belt as claimed in any preceding claim, wherein the Shore hardness of the adhesion rubber layer (3) is from 60° to 80°.
Claim 19
Independent Claim
194 words
A method of manufacturing a V-belt, comprising forming a belt blank by winding in succession around an outer wall of a cylindrical mould (11) a canvas covering (5), an adhesion rubber sheet (3a) and a compressive rubber sheet (2a), an elongate tensile member (6) which is subjected to a thermal elongation treatment also being spirally wound around the mould (11), and pressurizing and heating the belt blank to bond together the component parts thereof, characterised in that the outer wall of the cylindrical mould (11) has circumferentially spaced protrusions (12) thereon, the tensile member (6) has a differential thermal contaction stress between 100°C and 20°C of at least 3.5 g/ denier and is wound directly onto the canvas covering (5) so that the windings thereof are supported by the protrusions (12) and are in contact with portions of the canvas covering (5) which are disposed thereon, and the canvas covering (5) is stretchable circumferentially ef the mould (11) so as to permit during the pressurizing and heating operation, a part of the adhesion rubber sheet (3a) to flow between the windings of the tensile member (6) and into grooves (13) between said protrusions (12).
Claim 20
Independent Claim
194 words
A method of manufacturing a V-belt, comprising forming a belt blank by winding in succession around an outer wall of a cylindrical mould (11) a canvas covering (5), an adhesion rubber sheet (3a) and a compressive rubber sheet (2a), an elongate tensile member (6) which is subjected to a thermal elongation treatment also being spirally wound around the mould (11), and pressurizing and heating the belt blank to bond together the component parts thereof, characterised in that the outer wall of the cylindrical mould (11) has circumferentially spaced protrusions (12) thereon, the tensile member (6) has a differential thermal contaction stress between 100°C and 20°C of at least 3.5 g/ denier and is wound directly onto the canvas covering (5) so that the windings thereof are supported by the protrusions (12) and are in contact with portions of the canvas covering (5) which are disposed thereon, and the canvas covering (5) is stretchable circumferentially ef the mould (11) so as to permit during the pressurizing and heating operation, a part of the adhesion rubber sheet (3a) to flow between the windings of the tensile member (6) and into grooves (13) between said protrusions (12).
Claim 21
Dependent Claim
35 words
A method as claimed in claim 18, wherein prior to the pressurizing and heating operation at least one ply of rubberized canvas (7) or a rubber sheet is wound around the compressive rubber sheet (2a).
Claim 22
Dependent Claim
16 words
A method as claimed in claim 19, wherein the rubberized canvas (7) comprises a bias canvas.
Claim 23
Dependent Claim
18 words
A method as claimed in claim 19 or 20, wherein the rubberized canvas (7) comprises a stretchable canvas.
Claim 24
Independent Claim
56 words
A method as claimed in any one of claims 18 to 21, wherein the protrusions (12) are provided at substantially equal intervals w around the circumference of the mould (11) and are of substantially equal height h, the values of w and h being related to the overall thickness d of the finished V-belt as follows:-
Claim 25
Independent Claim
37 words
A method as claimed in any one of claims 18 to 22, wherein the tension of the elongate tensile member (6) after winding is 1.5 to 3.5 times its normal tension which is 0.2 to 0.6 g/denier.
Claim 26
Independent Claim
32 words
A method as claimed in any one of claims 18 to 23, wherein the compressive rubber sheet (2a) has embedded therein short fibres which are oriented generally axially of the mould (11).
References Cited (Backward Citations)
No citation records indexed.
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