Hydraulic servo device with built-in accumulator

Details Hydraulic servo device with built-in accumulator Hydraulic servo device with built-in accumulator

1984-10-05

1986-07-22

Garrett, Robert E.

Expansible chamber devices

Mutually relatively movable cylinder or sleeve, member...

Cylinder or sleeve forms working member

92 60, 92 63, 92152, F01B 700, F01B 720

Patent

active

046012338

ABSTRACT:
A hydraulic servo device with a built-in accumulator, comprising a servo piston fit in a servo cylinder and connected via a stem to a band brake, an accumulator piston having a large diameter outer diameter portion and a small diameter outer diameter portion fit in the servo cylinder at two inner diameter portions thereof having different diameters and an inner diameter portion fit around a small diameter outer diameter portion of the servo piston, and an accumulator piston spring biasing the accumulator piston toward the servo piston. A servo release pressure acts on a pressure acting area defined by a large diameter outer diameter portion of the servo piston, a servo apply pressure acts on a pressure acting area defined between the large diameter outer diameter portion the servo piston and the small diameter outer diameter portion thereof, and an accumulator pressure acts on a pressure acting area defined between the large diameter outer diameter portion of the accumulator piston and the small diameter outer diameter portion thereof.

REFERENCES:
patent: 2633712 (1953-04-01), Sheppard
patent: 2966888 (1961-01-01), Jania et al.
patent: 3241464 (1966-03-01), Pierce, Jr.
patent: 3353637 (1967-11-01), Chana
patent: 3450005 (1969-06-01), Ellis
patent: 3650162 (1972-03-01), Leising et al.
Forier, L. C., et al, editors, Motor Automatic Transmission Manual, 8th ed., New York: Motor, The Hearst Corp., 1979.

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