Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Reexamination Certificate
1996-07-18
2001-03-20
Gray, Linda L (Department: 1734)
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
C156S256000, C156S264000, C156S583100, C192S070120, C192S070140, C192S113360, C188S26400E, C188S26400E, C188S26400E
Reexamination Certificate
active
06203649
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a method of manufacturing a flat friction ring which consists of a supporting ring and a friction lining provided on at least one side of the supporting ring and forming, at least approximately radial oil grooves, which friction lining is first cut out of a friction lining web including slits extending from at least one circumferential side for forming the future oil grooves, and is then glued onto the supporting ring.
2. Description of the Prior Art
For manufacturing flat friction rings it is known (EP 0 305 582 A1) to punch out the friction lining from a friction lining web as a self-contained ring with slits forming the future oil grooves, which friction lining web is made of an organic friction material as in paper making, and to glue this friction lining ring onto the supporting ring. Cutting out a self-contained friction lining ring, which already includes the slits for the future oil grooves, ensures an easy and inexpensive manufacture, but due to the annular shape of the friction linings, there is a high waste of material of the friction lining web, so that the material utilization is unsatisfactory. If, according to another known manufacturing method (EP 0 583 516 A1), the friction lining is composed of single friction lining sectors, which are cut off from a strip of friction lining and are glued onto the supporting ring in a way spaced from each other so as to obtain radial oil grooves between adjacent friction lining sectors, a good material utilization regarding the friction lining is achieved, which has, however, the considerable disadvantage of an expensive and time-consuming manufacture, because the individual non-coherent friction lining sectors must be positioned accordingly before they are glued onto the supporting ring.
It is therefore the object underlying the invention to improve a method of manufacturing a flat friction ring of the kind described herein above, so that a simple, quick and inexpensive handling of the friction lining can be combined with a good utilization of material.
SUMMARY OF THE INVENTION
This object is solved by the invention in that the friction lining is cut out of the friction lining web in the form of a strip, and in the area of the connecting webs between the friction lining sectors separated from each other by the slits is bent in a polygon-like manner to form a ring and is glued onto the supporting ring.
By cutting friction lining strips out of the friction lining web, a good material utilization of the material web can be ensured, since at least in the case of a straight extension of the strips the individual strips can be placed side by side, so that the longitudinal edge, which forms the future outer circumference of the friction lining, each rests against the longitudinal edge forming the future inner circumference. When a curved extension of the strip is chosen, which may become necessary when a limited number of friction lining sectors is required in connection with a limited slit width as a result of the maximum possible bending angle between the friction lining sectors defined by the slit formation, the amount of waste produced is restricted to the slits and the gusset area formed between the bent friction lining strips. Since the friction lining sectors are separated from each other by the slits forming the future oil grooves except for a remaining connecting web, which provides for a hinge connection between the friction lining sectors, the friction lining strips preferably cut out by punching can each easily be bent to form a polygon ring, which can be glued onto a corresponding supporting ring. Due to the coherent friction lining sectors an easy handling is possible, which provides for a quick and inexpensive manufacture with a good utilization of material. The deviation of the polygon ring from the circular shape is irrelevant for the function of the friction ring, especially since adjacent their longitudinal edges the friction lining sectors can be cut out along circular arcs, which are adapted to the outside and/or inside diameter of the supporting ring.
Different circular arc radii in the area of the outer and inner circumference, however, produce an insignificant amount of waste as a result of the gussets formed between the abutting outer and inner sides of the friction lining strips. In order to avoid such waste, although it is a comparatively small amount, the friction lining sectors of the friction lining strips formed between the slits can be cut out along corresponding circular arcs on the outer and inner circumference. The resulting deviations from the outer and/or inner circumference of the supporting ring are irrelevant for the operation of the finished friction ring.
Particularly advantageous manufacturing conditions are achieved by a further embodiment of the invention when a double-sided adhesive film is glued onto the side of the friction lining web facing the supporting ring, before the friction lining strip is cut out, by means of which adhesive film the friction lining can be glued onto the supporting ring after having been cut out. This double-sided adhesive film not only facilitates the glueing of the friction lining strip cut out of the friction lining web onto the supporting ring, but also provides for a reinforcement of the friction lining strips in the area of the connecting webs between the friction lining sectors, so that these connecting webs can be designed sufficiently narrow in a way advantageous for bending within the lining plane, without impairing the coherence of the friction lining sectors during the handling of the friction lining strips.
When bending the cut-out friction lining strips in a polygon-like manner, tensile forces are produced in the outer area of the connecting webs, and compressive forces are produced in the inner area of the connecting webs, which might include the risk of these connecting webs unfolding from the friction lining plane. In order to avoid disadvantages resulting therefrom, the friction lining can be glued onto the supporting ring by means of hot pressing, so that the compressive forces acting upon the supporting ring and applied to the friction lining strips in the area of the connecting webs reliably prevent such an unfolding.
The inventive method of manufacturing a flat friction ring will now be explained in detail with reference to the drawing, wherein:
REFERENCES:
patent: 1210131 (1916-12-01), Achtmeyer
patent: 2037440 (1936-04-01), Taylor
patent: 2046988 (1936-07-01), Winter
patent: 4260047 (1981-04-01), Nels
patent: 4726455 (1988-02-01), East
patent: 4878282 (1989-11-01), Bauer
patent: 0 305 582 (1989-03-01), None
patent: 0 583 516 (1994-02-01), None
Hartner Gerhard
Kremsmair Christian
Collard & Roe, P. C.
Gray Linda L
Miba Frictec GmbH & Co. KG.
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