192 clutches and power-stop control – Elements – Engaging surfaces
Patent
1994-10-11
1996-09-03
Pitts, Andrea L.
192 clutches and power-stop control
Elements
Engaging surfaces
192107C, F16D 1364
Patent
active
055515495
DESCRIPTION:
BRIEF SUMMARY
This invention relates to friction material facing and carrier assemblies particularly for friction clutch driven plates, and to a method of manufacture thereof.
It is known to manufacture a friction clutch driven plate by the use of adhesive to secure an annular friction facing to a support-or carrier plate. In conventional driven plates an epoxy resin based adhesive may be used for this purpose.
It is desirable for the friction facing of a driven plate to have a certain degree of flexibility and axial cushioning. The epoxy resin adhesive film generally provides little or no compliance or cushioning.
The axial cushioning is desired to ameliorate a phenomenon known in the trade as "heat spotting", which leads to localised overheating of high spots on the friction faces of the driven plate, flywheel, or pressure plate. The cushioning also helps to prevent clutch judder on take-up of the drive.
The necessary axial cushioning is generally provided between the opposed back faces of a pair of annular friction facings. This is conventionally achieved by mounting the facings on spring steel cushioning segments. EP0252583A, describes the use of a silicone rubber adhesive for mounting a friction facing onto a carrier or support.
The silicone rubber adhesive serves to secure the facing to its support and also provides the necessary axial cushioning, thus allowing a simplification of the driven plate construction. In WO89/05411 there is disclosed a construction in which the silicone rubber adhesive is formed in discrete concentrically spaced circles. Each circle of adhesive is described as being formed by a respective adhesive nozzle.
In WO91/10842 there is described a friction material facing and carrier assembly for a clutch driven plate, and which comprises at least one annular friction facing secured to the carrier by a plurality of concentric circular stripes of adhesive elastomeric material which are coaxial with the facing, each circular stripe being interrupted at only a single point on the circle to form a gap between the beginning and end of the respective circle, and the interruptions in each circular stripe are radially aligned one with the other, and the end of one circular stripe is joined to the beginning of the adjacent concentric circular stripe so that the adhesive forms a continuous stripe from the radially inner margin of the facing to the radially outer margin of the facing.
The carrier plates described in the above documents each comprise an annular plate with a plurality of radially outwardly extending fingers equiangularly spaced around its outer periphery. Preferably there are thirty fingers but other numbers could be used if desired. The fingers are capable of flexing resiliently to allow axial movement of friction facing mounted thereon, the friction facing being somewhat flexible to allow small amounts of axial deformation.
In order to improve the burst strength of the driven plate the applicant has devised a new friction material and facing carrier.
According to the invention a friction material facing and carrier assembly for a clutch driven plate, and which comprises at least one annular friction facing secured to the carrier by stripes of adhesive elastomeric material which are coaxial with the facing, characterised in that the carrier plate has a plurality of perforations therein arranged in different diameter circular rows, and the stripes of adhesive are located on the circular lands either side of and between adjacent rows of perforations.
The invention will be described by way of example and with the reference to the accompanying drawings in which:
FIG. 1 is an illustration of a friction material facing carrier according to the invention;
FIG. 2 is a view in the direction of arrow A in FIG. 1 showing the facing carrier with two friction facings thereon, and
FIG. 3 shows a further form of friction material facing carrier according to the invention.
With reference to FIGS. 1 and 2, there is illustrated a friction material facing and carrier assembly 10 which is intended to form part
REFERENCES:
patent: 4821860 (1989-04-01), Crawford et al.
patent: 5076410 (1991-12-01), Maycock et al.
patent: 5271488 (1993-12-01), Cooke et al.
Cooke Richard D. M.
Struve Benjamin C.
Automotive Products plc
Germain Lee A.
Milliken Paul E.
Pitts Andrea L.
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