Pinless accumulator piston

Details Pinless accumulator piston Pinless accumulator piston

2005-05-31

2005-05-31

Rodriguez, Saul (Department: 3681)

192 clutches and power-stop control

Clutches

Operators

C192S10900B, C138S031000

Reexamination Certificate

active

06899211

ABSTRACT:
A replacement accumulator piston for various General Motors transmissions, which absorbs clutch apply fluid pressure to cushion the application of a clutch band against fluid shock is disclosed. The present pinless accumulator piston design eliminates the accumulator pin whereon the original equipment accumulator piston resides thereby resolving the problem of hydraulic leakage at the accumulator pin/piston interface. The elimination of the accumulator pin is accomplished by increasing the axial length of the piston sidewall or skirt, which permits the use of additional guide rings about circumference of the piston. The additional guide rings facilitate the reciprocating movement of the piston within the piston bore in the absence of the accumulator pin and also serve to maintain the hydraulic integrity of the accumulator. The pinless accumulator piston is a direct replacement for both the forward clutch accumulator, and the 1-2 gear and 3-4 gear accumulators in General Motors transmissions.

REFERENCES:
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patent: 6360778 (2002-03-01), Vennemeyer et al.
patent: 6390133 (2002-05-01), Patterson et al.
patent: 6609454 (2003-08-01), Frost
patent: 6612339 (2003-09-01), Wilke et al.

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