Hydraulic servo for friction coupling element of automatic trans

Details Hydraulic servo for friction coupling element of automatic trans Hydraulic servo for friction coupling element of automatic trans

1985-07-29

1987-07-28

Look, Edward K.

Expansible chamber devices

With separate biasing means for working member

192 85AA, F01B 3100

Patent

active

046825347

ABSTRACT:
Described herein is a hydraulic servo suitable for friction coupling elements in automatic transmissions. The hydraulic servo of the invention is compact in construction and reduced particularly in axial dimensions, and essentially comprises: an annular drum rotatably or fixedly mounted in a transmission case and having a press-formed annular plate member with an first cylinder portion and a second cylinder member joined to the first cylinder portion by fully encircling welding; a piston fitted between the first cylinder portion and the second cylinder member; and a reaction area formed by extending the annular plate member of the drum radially inward to support return springs.

REFERENCES:
patent: 2804780 (1957-09-01), Gerst
patent: 4114478 (1978-09-01), Clauss
patent: 4147245 (1979-04-01), Folomin et al.
patent: 4468983 (1984-09-01), Vieth

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