Dual master cyclinder with compensation valve

Details Dual master cyclinder with compensation valve Dual master cyclinder with compensation valve

1990-08-24

1991-12-10

Look, Edward K.

Power plants

Pressure fluid source and motor

Pulsator

60589, B60T 1120, B60T 1128

Patent

active

050706985

ABSTRACT:
A dual master cylinder (10) for the braking system of a motor vehicle comprising a bore (18), a primary portion (12) and a secondary portion, in which the primary piston (16) comprises an outer piston (65) slidable in the bore (18), and a central piston (78) slidable in a piston bore (64) defined by the outer piston, the piston bore having a shoulder (72) engageable with an abutment face (98) on the central piston to define a check valve (62), the piston bore providing a fluid passage (70,96,68) between the high pressure chamber (30) and the low pressure chamber (22) of the primary 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 (26) when back pressure is generated by ABS due to the absence of a dilation port in the primary portion, which is no longer required due to the presence of the check valve.

REFERENCES:
patent: 4492082 (1985-01-01), Belart
patent: 4707989 (1987-11-01), Nakamura et al.
patent: 4741161 (1988-05-01), Belart et al.
patent: 4746130 (1988-05-01), Abele
patent: 4838619 (1989-06-01), Ocvirk
patent: 4918922 (1990-04-01), Nakano et al.
UK Patent Office Search Report AN 8920874.8 Jan. 3, 1990.

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