Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1990-06-08
1993-03-23
Weston, Caleb
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156290, 156291, 192107R, 192107M, 192107C, B29C 4706
Patent
active
051960818
DESCRIPTION:
BRIEF SUMMARY
This invention relates a friction facing material and carrier assembly for a clutch driven plate.
The driven plate may be used in a dry friction clutch.
In particular, though not exclusively, the clutch driven plate may be used in a clutch for a motor vehicle.
The friction facing and carrier assembly concerned is of a type (hereinafter called "the type referred to") comprising at least one annular array of friction material adhered to a carrier by elastomeric material, and in use said assembly being intended for rotation about a axis.
U.S. Pat. No. 4,529,079 discloses an assembly of the type referred to in which two continuous rings of friction material are adhered to opposite sides of a substrate, each ring of friction material being bonded to a respective side of the substrate by a plurality of small, discrete well spaced regions of elastomeric material in the form of dots or round blobs, or as rectilinear stripes extending radially of the ring of friction material, or as a combination of radial stripes and short rectilinear stripes extending tangentially of the ring. A drawback with the blobs and radial stripes in that, when the assembly is in use and torque is input thereto to rotate the assembly, the rotary force acting in shear on the regions of elastomer can peel or roll off each region of elastomer (starting initially at the trailing side of each region) from the facing material or the substrate thus weakening and possibly eventually destroying the bond between the substrate and the facing material. The same thing can happen when the regions of elastomer are a combination of the radial and short, rectilinear, tangential stripes as aforesaid.
An object of the invention is to provide an assembly of the type referred to in which said drawback is avoided or at least mitigated.
According to one aspect of the present invention a friction facing and carrier assembly of the type referred to is characterized in that said carrier is formed with one or more voids therethrough each spanned by said annular array of friction material and said annular array of friction material is bonded to said carrier by a plurality of stripes of said elastomeric material, each said stripe extending around said axis in continuous contact with the array of friction material, and radially of said axis said stripes being at least mainly spaced one from another.
According to a further aspect of the present invention a friction facing and carrier assembly of the type referred to is made by a method characterized in that an elastomeric material is applied to at least one array of friction material in the form of a plurality of stripes, each said stripe extending around said axis in continuous contact with the array of friction material, and radially of said axis said stripes being at least mainly spaced one from another, and said stripes are applied against a carrier which is formed with one or more voids such that each said void is spanned by said annular array of friction material, so as to adhere said array to said carrier.
By making the bonding stripes of elastomer substantially continuous, the region or each of the regions of elastomer constituting a said stripe is relatively long and tends not to be small. This increases the shear resistance in each region and thus provides enhanced resistance to bond failure.
Each said stripe may be a substantially circular stripe.
The circular stripes may be disposed as substantially concentric circles lying in a substantially common plane, said circles having substantially the same centre lying substantially on said axis.
In a preferred embodiment each said stripe is completely continuous.
Preferably at least one passage is provided which allows flow of gas into and out of a space between two adjacent said stripes of elastomeric material. During curing or vulcanising of the elastomeric material which causes the friction material to become bonded to the carrier, then each passage permits exposure (in said space) of the two stripes of elastomer to the ambient atmosphere which may be heated and
REFERENCES:
patent: 3231058 (1966-01-01), Batchelor
patent: 4529079 (1985-07-01), Albertson
patent: 4821860 (1989-04-01), Crawford et al.
patent: 5076410 (1991-12-01), Maycock et al.
Automotive Products plc
Weston Caleb
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