Hydraulic servo automatic transmission friction brake band

Details Hydraulic servo automatic transmission friction brake band Hydraulic servo automatic transmission friction brake band

1996-05-30

1998-05-19

Graham, Matthew C.

Brakes

Wheel

Transversely movable

188366, F16H 6128

Patent

active

057525889

ABSTRACT:
A hydraulic servo for friction brakes of an automatic transmission comprises a cylinder (2) with a main piston (3) arranged therein, a smaller cylinder (8) to receive a smaller compensation piston (9), the smaller cylinder communicating with the pressure chamber (5) of the main piston (3) through an orifice (18) controlled by a ball valve (20). A stepped bore (22) connects the pressure chamber (5) to the compensation chamber (17). A stepped piston (23), located in the bore, forms a discharge control valve (24), which controls the discharge of pressure medium from the compensation chamber (17).

REFERENCES:
patent: 2513192 (1950-06-01), McFarland
patent: 2636578 (1953-04-01), Swift
patent: 2901888 (1959-09-01), Swift
patent: 3004390 (1961-10-01), Duffy
patent: 4388986 (1983-06-01), Umezawa
patent: 4428462 (1984-01-01), Warwick et al.
patent: 4802559 (1989-02-01), Fourie et al.
SAE, Design Practices, "Passenger Car Automatic Transmissions", vol. 5, Revised 2nd Edition, pp. 113-115.

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