Balance dam return spring for friction element of an automatic t

Details Balance dam return spring for friction element of an automatic t Balance dam return spring for friction element of an automatic t

1994-12-05

1996-08-06

Lorence, Richard M.

192 clutches and power-stop control

Clutches

Operators

192106F, F16D 250638

Patent

active

055425178

ABSTRACT:
An hydraulically-actuated friction brake or clutch for an automatic transmission includes an hydraulic cylinder (38), a piston (44, 44') displaceable within the cylinder, a rotating shaft (28) on which the piston is supported and sealed, passages (28, 30) supplying actuating pressure to the cylinder, and a Belleville spring (62) fixed against displacement at one end and resiliently displaceable in response to movement of the piston. The piston, shaft, and spring define a sealed space (64), which is filled with hydraulic fluid to produce a centrifugal pressure force on the piston that opposes and balances centrifugal pressure developed within the cylinder.

REFERENCES:
patent: 4509627 (1985-04-01), Kawamoto
patent: 4732253 (1988-03-01), Hiramatsu et al.
patent: 4957195 (1990-09-01), Kano et al.
patent: 5180346 (1993-01-01), Carriere
patent: 5234389 (1993-08-01), Goates
patent: 5261862 (1993-11-01), Pierce
patent: 5421439 (1995-06-01), Hayasaki
patent: 5439088 (1995-08-01), Michioka et al.

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