High performance intermediate servo assembly and method of use

Details High performance intermediate servo assembly and method of use High performance intermediate servo assembly and method of use

2006-05-23

2006-05-23

Hong, John C. (Department: 3726)

Metal working

Method of mechanical manufacture

Converting

Reexamination Certificate

active

07047611

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. 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. O-ring seals on the original equipment servo piston are replaced by high performance seals such as quad-lobed seals to ensure hydraulic integrity under the increased fluid pressure generated. A method of replacing the original equipment components with the present servo assembly is disclosed.

REFERENCES:
patent: 4388986 (1983-06-01), Umezawa
patent: 4601233 (1986-07-01), Sugano
patent: 4787494 (1988-11-01), Ogasawara et al.
patent: 5086887 (1992-02-01), Van Maanen et al.
patent: 5235899 (1993-08-01), Hauser
patent: 5944627 (1999-08-01), Darling-Owen et al.
patent: 6357560 (2002-03-01), Miller et al.

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