Power plants – Pressure fluid source and motor – Pulsator
Patent
1990-08-24
1992-09-15
Look, Edward K.
Power plants
Pressure fluid source and motor
Pulsator
60592, 92 63, 92 82, B60T 1120
Patent
active
051467518
ABSTRACT:
A dual master cylinder (10) for the braking system of a motor vehicle comprising a bore (18), a primary portion and a secondary portion (14), in which the secondary piston (44) of the secondary portion comprises an outer piston (65) slidable in the bore, and a central piston (78), the central piston including a main body (86) slidable in the bore and a secondary body (92) slidable in a piston bore (64) in the outer piston, the piston bore having a shoulder (72) engageable with a first abutment face (98) on the central piston to define a check valve (62), the piston bore providing a fluid passage (96,68) between the high pressure chamber (56) and the low pressure chamber (48) of the secondary portion, the check valve allowing hydraulic fluid to flow through the fluid passage during a rest mode or a release mode of the dual master cylinder, but preventing such flow during an apply mode. Prevents damage to elastomeric cup seal (52) when back-pressure is generated by ABS due to the absence of a dilation port in the secondary portion, which is no longer required due to the presence of the check valve.
REFERENCES:
patent: 2174615 (1939-10-01), Bowen et al.
patent: 3355887 (1967-12-01), Balster
patent: 3646759 (1972-03-01), Hughes et al.
General Motors France
Helms Ernest E.
Look Edward K.
Lopez F. Daniel
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