192 clutches and power-stop control – Clutches – Operators
Patent
1992-07-08
1993-11-02
Lorence, Richard M.
192 clutches and power-stop control
Clutches
Operators
192107R, 464 68, F16D 1364
Patent
active
052576876
DESCRIPTION:
BRIEF SUMMARY
This invention relates to friction clutch driven plates for vehicles and in particular to friction clutch driven plates for cars.
A typical motor vehicle engine is connected to the vehicle gear box through a friction clutch which includes a pressure plate and flywheel connected to the engine, and a clutch driven plate sandwhiched therebetween which is connected to the vehicle gear box.
In order to smooth out the clutch engagement on take up of the drive from the engine, the clutch driven plate generally has some axial cushioning between its opposed friction facings, and a torsion damping means between the friction facings which engage the engine, and the driven plate hub which is connected to the gear box.
The present invention seeks to provide a different construction of clutch in which the two friction facings also have some degree of torsion damping operable therebetween during the clutch take up. This will help prevent clutch judder and give an improved clutch take-up.
Accordingly there is provided a friction clutch driven plate having a hub and friction facings which face in opposite directions, the friction facings for each direction are mounted on a respective coaxial annular carrier plate which is rotatable about the hub, each carrier being rotatable about the hub, the two carrier plates being secured back to back with each other such that one carrier plate can rotate relative to the other carrier plate, said rotation being opposed by resilient means.
Preferably the two carrier plates are secured by fastening means passing through aligned holes in the two carrier plates, said holes in at least one carrier plate being enlarged relative to the fastening means to enable said one carrier plate to move rotationally relative to the other carrier plate, said relative rotation being resisted by resilient means acting between the two carrier plates.
The relative rotation between the two carrier plates can only occur until the clamping load of the clutch springs prevents further relative rotation.
Preferably the carrier plates are annular steel plates with a plurality of radially projecting circumferentially spaced fingers around the outer peripheral edge thereof, and the friction facings are secured to the projecting fingers.
Preferably the hub has a radially outwardly extending flange, and the two carrier plates are secured by said fastening means to a disc adaptor arranged on one axial side of the hub flange, and the disc adaptor is secured by an axially extending fastening means to a retainer plate which is located on the other axial side of the flange, the axially extending fastening means passing through co-operating apertures in the hub flange which allow the disc adaptor and retainer plate to move rotationally about the hub, said rotational movement being resiliently opposed by torsion damping springs housed in aligned spring windows in the hub flange, disc adaptor, and retainer plate.
The fastening means, conveniently a rivet, utilised for holding the disc adaptor to the retainer plate may also be used to secure the carrier plates to the disc adaptor.
The invention will be described by way of example and with reference to the accompanying drawings in which:
FIG. 1 is an elevation of a friction clutch driven plate according to the invention.
FIG. 2 is a section on the line II--II of FIG. 1 also showing a flywheel, pressure plate, and spring in broken lines.
FIG. 2A is a fragmentary cross-sectional view showing friction facings adhesively attached to carrier plates.
FIG. 3 is an elevation of the fixed carrier plate of the driven plate of FIG. 1.
FIG. 4 is an elevation of the movable carrier plate of the driven plate of FIG. 1.
FIG. 5 is an elevation of the hub flange.
FIG. 6 is an elevation of the disc adaptor.
FIGS. 7a, 7b and 7c and 8a and 8b are schematic drawings showing the relationship between the spring windows of the various moving parts of the driven plate.
With reference to FIGS. 1 to 6 of the accompanying drawings, the illustrated friction clutch driven plate 10 comprises a hub 11 having in
REFERENCES:
patent: 1862991 (1932-06-01), Vargha
patent: 1896968 (1933-02-01), Paton
patent: 1931065 (1933-10-01), Drude
patent: 4821860 (1989-04-01), Crawford et al.
patent: 4892177 (1990-01-01), Lanzarini et al.
Automotive Products plc
Germain Lee A.
Lorence Richard M.
Milliken Paul E.
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