192 clutches and power-stop control – Elements – Engaging surfaces
Reexamination Certificate
1999-06-30
2001-01-09
Bonck, Rodney H. (Department: 3681)
192 clutches and power-stop control
Elements
Engaging surfaces
C156S258000
Reexamination Certificate
active
06170629
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an improvement in friction plates used, for example in a multiple-plate friction engagement apparatus, such as a lock-up clutch in an automatic transmission of a motor vehicle or in a transmission of a motor bike.
2. Related Background Art
In the past, a friction plate has been manufactured by adhering a plurality of friction material segments to an annular core plate in an annular fashion. For example, as shown in
FIGS. 3 and 4
, the segments have been interconnected by connecting portions configured similar to pieces of jigsaw puzzles.
However, when the friction material segments are stamped from a friction material tape, burrs can be generated at ends of the stamped friction material segments.
FIG. 6
is a sectional view showing conventional connecting portions in detail. Friction material segments
12
are adhered to the surface of a core plate
11
in such a manner that burrs formed on connecting portions
16
of the stamped friction material segments
12
are protruded from a frictional engagement surface, i.e., toward an associated member
17
.
In the above-mentioned conventional friction plate, if the friction material segments are adhered to the core plate in such a manner that the burrs are protruded toward the associated member, the friction material is locally contacted with the associated member via the burrs, with the result that the connecting portions of the friction material segments may be peeled or ripped off.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a friction plate in which connecting portions of friction material segments can be prevented or suppressed from being peeled or ripped off and which has excellent endurance.
To achieve the above object, the present invention provides a friction plate formed by adhering a plurality of friction material segments having connecting portions to be interconnected onto a core plate, wherein frictional engagement surface side portions (portions constituting a part of the frictional engagement surface) of the connecting portions of the friction material segments are formed as recessed portions.
Since the frictional engagement surface side portions of the connecting portions of the friction material segments are formed as the recessed portions, for example, by boring, chamfering or compression, there is no projection protruded toward an associated member, with the result that the connecting portions are not locally contacted with the associated member, thereby preventing the connecting portions from being peeled or ripped off.
REFERENCES:
patent: 3467229 (1969-09-01), Diebel
patent: 3759354 (1973-09-01), Dowell et al.
patent: 4010831 (1977-03-01), Reuter
patent: 4260047 (1981-04-01), Nels
patent: 4674616 (1987-06-01), Mannino, Jr.
patent: 5232075 (1993-08-01), Mohan
patent: 5713450 (1998-02-01), Quigley
patent: 5954172 (1999-09-01), Mori
Sakai Masaki
Suzuki Hirotsugu
Watanabe Takayuki
Bonck Rodney H.
NSK - Warner K.K.
Vorys Sater Seymour and Pease LLP
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