192 clutches and power-stop control – Elements – Engaging surfaces
Patent
1987-12-07
1989-09-12
Braun, Leslie A.
192 clutches and power-stop control
Elements
Engaging surfaces
192107C, F16D 1360
Patent
active
048651770
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a fricton facing assembly used in a friction clutch of an automobile and other uses, and particularly to a structure and method for fixing the friction facings to a support or metal support plate of a clutch disc.
An example of such facing assembly is described in the Japanese Utility Model Application No. 56-98240 (U.S. Pat. No. 4,537,299). In the assembly, an annular support which forms a radially outer part of a clutch disc is provided with a plurality of apertures, and a pair of facings disposed at opposite sides of the support are integrally connected together and fixed to the support by portions of the facings which enter the apertures.
According to this structure, as compared with a conventional structure in which facings are riveted onto a support, a manufacturing process can be simple and the permissible wear can be increased, resulting in a long durability.
However, in the structure in said U.S. patent, a strain may be generated in the support by a heat when the facing materials located at opposite sides of the support are formed by a press machine in the manufacturing process. The strain may cause axial deviation or error of the position of the support between the facings, and thus, may cause deviation of thickness of the facings, resulting in a short durability of the facings.
Accordingly, it is an object of the invention to provide a method and a structure for assembling facings, overcoming the abovenoted disadvantages.
DISCLOSURE OF INVENTION
The invention provides a structure for assembling friction facings comprising an annular support which is made of a plate member and is disposed at an outer peripheral portion of a clutch disc; and a pair of annular friction facings supported on opposite surfaces of the support, respectively. The support is provided, at least at supporting portions which supports the facings, with connection apertures and radial slits extending between the inner and outer peripheries of the supporting portions. The facings include portions which enter said apertures and slits and integrally connect both facings together. Each facing is provided at the surface opposite to the support, with hollows positioned at near the slits and having circumferential widths wider than those of the slits. The hollows axially overlap the edge portions of the slits in the supporting portions at circumferentially opposite sides of the slits.
The invention further provides a method for assembling friction facings of a clutch disc comprising an annular support which is made of a plate member and is disposed at an outer peripheral portion of the clutch disc; and a pair of annular friction facings supported on opposite surfaces of the support, respectively; the support being provided at least at supporting portions which support the facings with connection apertures and radial slits which extend between the inner and outer peripheries of the supporting portions. The facings include poortions which enter the apertures and slits and integrally connect opposite facings together the method comprises the steps in which a pair of facing materials are disposed at the opposite sides of the support; and a forming step in which the facing materials are formed into predetermined forms by forming dies. In the forming step, portions of the facing materials are urged into the connecting apertures and the slits to integrally connect the facings together. Simultaneously projections, which are formed on the dies; project into the facing materials toward the slits to support edge portions of the supporting portions at circumferentially both sides of the slits so as to position the support at the axially central position between the facings while forming the hollows on the surface of the facings.
BRIEF DESCRIPTION OF THE INVENTION
FIG. 1 is a fragmentary plane view of a clutch disc including an embodiment of the invention with parts cut away;
FIG. 2 is a schematic sectional view taken alone line II--II in FIG. 1; and
FIG. 3 is a schematic sectional view illu
REFERENCES:
patent: 1562144 (1923-07-01), Burns
patent: 1656779 (1926-01-01), Desroziers
patent: 1846560 (1932-02-01), Kattwinkel
patent: 2054210 (1936-09-01), Weisenburg
patent: 2237624 (1941-04-01), Oldham
patent: 3480117 (1969-11-01), Agren et al.
patent: 4537299 (1985-08-01), Fukatani
Braun Leslie A.
Kabushiki Kaisha Daikin Seisakusho
Pitts Andrea
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