Transmission piston and method of making the same

Details Transmission piston and method of making the same Transmission piston and method of making the same

1982-08-27

1984-12-04

Larson, Lowell A.

Metal deforming

By use of tool acting during relative rotation between tool...

During rotation of work

291565R, B21H 100

Patent

active

044856563

ABSTRACT:
The invention pertains to a piston for use in vehicle automatic transmissions and the method of making the same. An automatic transmission piston is of an annular configuration having a radial pressure face and an axially extending flange which includes an outer periphery in which a seal receiving groove is defined. The invention produces the piston from a sheet metal stamping blank and the blank flange is of a greater axial dimension than that of the flange after forming. The seal receiving groove is formed in the piston flange by a rolling operation, and during the rolling the axial dimension of the flange is reduced by compression of the flange material wherein the metal radially displaced is provided by the flange compression and the radial dimension of the flange thickness is substantially maintained during and after rolling as the simultaneous compression of the flange during the rolling of the seal receiving groove provides the extra metal required without producing a deficiency in the piston dimensions.

REFERENCES:
patent: 975301 (1910-11-01), Talbot
patent: 1854455 (1932-04-01), Day
patent: 3712099 (1973-01-01), Elsbett et al.
patent: 4193179 (1980-03-01), Confer et al.
Hayes-Albion Corporation Sketches of Design-Exhibits A and B.

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