Hydraulic brake booster

Details Hydraulic brake booster Hydraulic brake booster

1979-08-23

1981-07-28

Maslousky, Paul E.

Motors: expansible chamber type

Constantly applied motive fluid with controlled venting

91391R, 91431, 91434, F15B 1314, F15B 1310

Patent

active

042803950

ABSTRACT:
The booster is installed downstream of a vehicle's power steering gear. The booster has a power piston and a valve seat piston reciprocably mounted in a bore of the booster housing. Hydraulic inlet pressure is introduced into the housing bore between these pistons and flows through a normally open poppet valve, which acts as a booster control valve. Movement of the booster input push rod restricts hydraulic fluid flow through the control valve and causes pressure to be built up in the power chamber between the pistons. The pressure acts on the power piston to move the booster output member. The pressure also holds the valve seat piston in position against the bore and wall so that it does not move during normal power boost operation. In the power mode brake pedal travel can be very low, permitting a high brake pedal ratio for the no-power operating mode.

REFERENCES:
patent: 3093119 (1963-06-01), Stelzer
patent: 3148592 (1964-09-01), Schultz et al.
patent: 3353451 (1967-11-01), Garrison et al.
patent: 4009640 (1977-03-01), Takeuchi et al.
patent: 4181064 (1980-01-01), Flory

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