Metal working – Method of mechanical manufacture – Assembling or joining
Reexamination Certificate
1999-06-14
2001-10-30
Bryant, David P. (Department: 3726)
Metal working
Method of mechanical manufacture
Assembling or joining
C029S412000, C192S10700R
Reexamination Certificate
active
06308397
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for manufacturing a friction plate used for an automatic transmission and/or a lock-up clutch of a vehicle.
2. Related Background Art
In order to manufacture a plurality of friction plates having different diameters, for example as shown in
FIG. 4
, large and small core plates were separately formed by a press and the like, and friction member segments were independently adhered to the core plates.
In
FIG. 4
, first of all, in a step (A), a large-diametered core plate
11
and a small-diametered core plate
12
having a diameter smaller than the core plate
11
are simultaneously stamped from a plate material, and independent large-diametered core plate
11
and small-diametered core plate
12
are completely separate.
Then, in a step (B), friction member segments
16
stamped from a friction tape
13
and friction member segments
14
stamped from a friction tape
15
are adhered to the large-diametered core plate
11
and the small-diametered core plate
12
, respectively. This operation is effected along a circumferential direction. When the adhesion of the friction member segments is completed, as shown in a step (C), a large-diametered frictional plate
30
and a small-diametered friction plate
40
are separately formed independently. In this case, main adhesion is effected.
However, the aforementioned conventional manufacturing method has the following problems.
There is no consistency from the stamping of the press from the adhesion, and the number of adhering processes is increased depending upon the number of kinds of the friction plate, and, in set change, if the adhesion is effected in the same process, twice the time is required for the number of kinds of the friction plate.
Further, since the adhesion of each friction member segment to the core plate is repeated, it is difficult to reduce the manufacturing time.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to solve the above-mentioned problems.
To solve the above problems, the present invention provides in one of its aspects, a method for manufacturing friction plates obtained by adhering friction members to substantially annular core plates, comprising the steps of simultaneously stamping a plurality of coaxial core plates having different diameters with remaining joint portions therebetween, preliminarily adhering friction member segments to the stamped plural core plates, and stamping the joint portions during or after a main adhering step following the preliminarily adhering step.
According to the present invention, consistency from the stamping of the press from the adhesion can be established. Further, by supplying the friction member segments in a unique manner, yield of material can be maintained in the same level as the conventional case.
Furthermore, since a pitch for supplying the friction member segments is varied so that the friction member segments can simultaneously be adhered to diametrically opposed portions of the same core plate, the repeated adhering time can be reduced to half.
REFERENCES:
patent: 3854359 (1974-12-01), Tagami
patent: 4989696 (1991-02-01), Buell
patent: 5571372 (1996-11-01), Buell
patent: 6019205 (2000-02-01), Willwerth et al.
Horiuchi Nobuhiro
Nishimura Shigeharu
Bryant David P.
Cozart Jermie E.
Miles & Stockbridge P.C.
NSK-Warner K.K.
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