192 clutches and power-stop control – Clutches – Axially engaging
Patent
1991-07-24
1993-04-06
Lorence, Richard
192 clutches and power-stop control
Clutches
Axially engaging
192107C, 192107M, F16D 1364, F16D 6904
Patent
active
051995409
DESCRIPTION:
BRIEF SUMMARY
This invention relates to 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.
It is known to have a friction material and carrier plate assembly comprising a carrier plate substantially in the form of a disc and two annular arrays of friction material arranged coaxially with the carrier plate and attached to opposite sides of the carrier plate by layers of adhesive. An example of such an assembly is disclosed in GB-A-2170871 which describes a carrier plate having voids therein which are between the arrays of friction material and allow axial flexibility in the assembly.
There has been a previous proposal, as disclosed in EP-A-252583, to bond first and second annular arrays of friction material to opposite sides of a carrier using silicone rubber as the adhesive, to produce a friction material and carrier assembly for a clutch driven plate. The two layers of silicone rubber are both relatively thick to provide resilient cushioning for the friction material.
Another method of providing cushioning between the friction material elements is described in GA-A-2191831. That document discloses a carrier plate having two sets of spokes at the periphery thereof, the two sets being spaced apart axially and having a layer of deformable elastomeric material there- between. Annular friction material elements adhered to the two sets of spokes are cushioned by the layer of elastomeric material.
According to the invention there is provided a friction material and carrier assembly for a clutch driven plate, the assembly being intended for rotation about an axis, and said assembly comprising a carrier having first and second opposite sides, a first array of friction material being disposed at said first side, a second array of friction material being disposed at said second side, each array of friction material being arranged circumferentially about said axis, said first array of friction material being secured to the carrier by means of a first adhesive bond, the second array of friction material being secured to the carrier by mean of a second adhesive bond, said second adhesive bond being of elastomeric material providing resilient cushioning relative to the carrier for the second array of friction material, and the first adhesive bond providing less cushioning that the second adhesive bond thereby to allow less axial movement relative to the carrier for the first array of friction material than is provided for the second array of friction material.
According to the present invention there is also provided a friction clutch assembly comprising a pressure plate, a reaction member and a driven plate all rotatable about a common axis, the driven plate being axially between the pressure plate and the reaction member, the pressure plate being movable axially with respect to the reaction member to engage the driven plate with the pressure plate and the reaction member, the driven plate comprising a friction material and carrier assembly according to the invention.
In an assembly formed according to the invention, the elastomeric material providing bonding and cushioning is primarily only on the second side of the carrier. The bond on the first side can be much thinner than that on the second side. Thus by comparison with the aforesaid previously proposed assembly having two equally thick layers of elastomeric material (when the latter is unworn), the axial distance between the friction faces of the arrays of friction facing material can be less in an unworn assembly formed in accordance with the invention. This enables an axially slimmer clutch driven plate to be produced. Alternatively the axial thickness of the second array of friction material can be increased to keep the initial axial thickness of the assembly equal to the axial thickness of the previously proposed assembly when the latter is unworn. Such an increase in the thickness of the
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Cooke Richard D.
Fitzpatrick-Ellis John F.
Sleath Stuart J.
Automotive Products plc
Lorence Richard
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