192 clutches and power-stop control – Elements – Clutch element resiliently carried on hub
Patent
1993-12-03
1996-05-21
Lorence, Richard M.
192 clutches and power-stop control
Elements
Clutch element resiliently carried on hub
19221312, 19221331, 1922141, F16D 314
Patent
active
055180990
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 sandwiched 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.
In our application PCT/GB91/00001 we have described 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, at least one of the carrier plates 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. Such a driven plate will be called a driven plate of the type referred.
According to the present invention there is provided a driven plate of the type referred in which friction damping means act to resist said rotation.
Such a driven plate prevents clutch judder and gives an improved clutch take up.
Preferably, the two carrier plates are secured together 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, and conveniently the two carrier plates are in frictional engagement one with the other.
Preferably the radially inner portions of the carrier plates are shaped to act as belleville springs with at least one carrier plate biased against the other carrier plate.
Alternatively the hub has a radially outwardly extending flange, and the two carrier plates are secured to a disc adaptor arranged on one axial side of the hub flange, and the disc adaptor is secured to a retainer plate on the other axial side of the flange, said fastening means extending axially through co-operating apertures in the hub flange which allow the disc adaptor and retainer plate to move rotationally about the hub, the two carrier plates, being located axially between the hub flange and the disc adaptor, and resilient means located around each fastening means act to bias the carrier-plates together.
Preferably the resilient means are belleville springs with at least one spring locating coaxially with each fastening means, and preferably each belleville spring acts between the retainer plate and disc adaptor through a sleeve slidable on the fastening means.
Alternatively the friction damping means includes a friction washer fast with the hub which engages a surface on said one carrier.
Preferably said relative rotation is also resisted by resilient means acting between the two carrier plates.
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;
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;
FIGS. 5, 6, 6A and 7 are sections or partial sections similar to FIG. 2 showing alternative friction damping means;
FIG. 8 is an elevation of a further embodiment of a friction clutch driven plate according to the invention;
FIG. 9 is a section on the IX--IX of FIG. 8; and
FIG. 10 is an enlargement of the fastening means and resilient means shown in FIG. 8.
With reference to FIGS. 1 to 4 of the accompanying drawing, the illustrated friction clutch driven plate is comprises a hub 11 having internal
REFERENCES:
patent: 1862991 (1932-06-01), Vargha
patent: 1896914 (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.
patent: 5059155 (1991-10-01), Tojima
patent: 5257687 (1993-11-01), Cooke
Automotive Products plc
Germain Lee A.
Lorence Richard M.
Milliken Paul E.
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