Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1993-11-23
1995-10-24
Ryznic, John E.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
60552, F15B 910, B60T 1320
Patent
active
054600758
ABSTRACT:
A hydraulic master cylinder (1) comprises a body (2) in which conventional output chambers (5,6) are defined. In use, the output chambers are pressurized by a piston (4) which is moved by a combination of mechanical input force applied to an input member (8) and hydraulic pressure within a servo chamber (13) located to the rear of the piston (4). Connection of the servo chamber (13) to a pressure source is controlled by poppet valves (16, 17) which are opened as necessary by ribs (23, 24) of a sleeve (22) mounted on imput member (8). The sleeve (22) is coupled to the piston (4) but free to rotate relative to the input member (8) and is coupled to the input member by means of a helical groove and ball arrangement such that movement of the input member (8) towards the piston (4) causes rotation of the sleeve (22) to open the inlet valve (17), and movement of the input member ( 8) away from the piston (4) causes opposite rotation of the sleeve (22) to close the input valve (17) and open the outlet valve (18).
REFERENCES:
patent: 2410269 (1946-10-01), Chouings
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patent: 3827242 (1974-08-01), Belart
patent: 3832933 (1974-09-01), Jablonsky
patent: 4341076 (1982-07-01), Steffes
patent: 4687259 (1987-08-01), Reinartz et al.
patent: 5351600 (1994-10-01), Ishiwata
Lucas Industries Public Limited Company
Ryznic John E.
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