Fluid-pressure and analogous brake systems – With pump – Pressure control
Patent
1993-07-06
1994-05-10
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
With pump
Pressure control
188151A, B60T 1322
Patent
active
053102517
ABSTRACT:
In one embodiment the invention comprises a system (50; 200) for controlling service brake and parking functions of at least one wheel of a vehicle comprising: an electric motor (64) drivingly connected to a hydraulic pump (66) for pressurizing hydraulic fluid; the output of the pump communicated to at least one service brake (58a,b), comprising a first hydraulic cylinder (62a,b), an electronics circuit for controlling the speed of the motor (64) to regulate hydraulic pressure in the first hydraulic cylinder in response to operator braking activity (56, 64, 62), the motor and pump providing the primary means of service brake activation. The output of the pump is also communicated to a parking brake mechanism (30; 150), comprising a second hydraulic cylinder (34; 160), the parking brake mechanism having an activated mode of operation corresponding when the second hydraulic cylinder is unpressurized and a deactivated mode of operation corresponding when the second hydraulic cylinder is pressurized, and pressure control valves for controlling flow to and from the various hydraulic cylinders. A second variant of the system is disclosed in which only service brakes are electro-hydraulically controlled.
REFERENCES:
patent: 3777857 (1973-12-01), Hughes
patent: 3982792 (1976-09-01), Nakajima
patent: 4076324 (1978-02-01), Kroth
patent: 4428620 (1984-01-01), Warwick et al.
patent: 4458791 (1984-07-01), Schneider et al.
patent: 4564245 (1986-01-01), Barberis
patent: 4758052 (1988-07-01), Bechman et al.
patent: 4848852 (1989-07-01), Inoue et al.
Patient Daniel J.
Towers Kenneth S.
Allied-Signal Inc.
Ballato Josie A.
Oberleitner Robert J.
Seitzman Markell
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