High performance intermediate servo assembly

Details High performance intermediate servo assembly High performance intermediate servo assembly

2005-06-21

2005-06-21

Lorence, Richard M. (Department: 3681)

192 clutches and power-stop control

Clutches

Operators

C188S07700R, C188S15100A

Reexamination Certificate

active

06907974

ABSTRACT:
A high performance intermediate servo assembly wherein the servo piston has been modified to provide at least a 17% increase in surface apply area and a corresponding increase in hydraulic pressure delivered to the 2ndgear clutch band which it actuates is disclosed. The present servo piston is reconfigured to an overall length equivalent to the assembled stack-up dimensions of the original equipment servo piston, accumulator, accumulator spring, and spring retainer components and integrates the critical working surfaces thereof to retain proper function. Such original equipment components have been eliminated to simplify the intermediate servo assembly operation since shift feel is not a concern in this application. Further, the standard O-ring seals on the original equipment servo piston are replaced by high performance seals such as quad-lobed seals to ensure the hydraulic integrity of the present intermediate servo assembly under the increased fluid pressure generated.

REFERENCES:
patent: 3347556 (1967-10-01), Fleckenstein
patent: 4388986 (1983-06-01), Umezawa
patent: 4601233 (1986-07-01), Sugano
patent: 4628795 (1986-12-01), Pickard et al.
patent: 4787494 (1988-11-01), Ogasawara et al.
patent: 4930373 (1990-06-01), Nakawaki et al.
patent: 5253549 (1993-10-01), Younger
patent: 5944627 (1999-08-01), Darling-Owen et al.
patent: 6050384 (2000-04-01), Hammond
“The Superior 200-4R Super Servo Instruction Sheet,” copyright date 2000, Shift Technology Products, Division of Superior Transmission Parts, Inc., 3770 Hartsfield Road, Tallahassee, FL 32303.

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