Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1991-03-14
1992-05-12
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
B60T 842
Patent
active
051121166
ABSTRACT:
A vehicle wheel anti-lock braking system (ABS) is provided including a master cylinder and a wheel brake. A controller cognizant of the rotational condition of the wheel provides a signal when the wheel condition is within preset parameters. An actuator frame is also provided having a bore fluidly communicating with the wheel brake. A piston is mounted within the bore for providing a variable control volume in communication with the wheel brake and for modulating the pressure therein. A reversible motor reciprocally powers the piston. The motor has a rotor with a connected disc. A friction surface is provided for engagement with the disc to lock the position of the piston. A plunger is also provided to urge the friction surface into engagement with the disc. An electromagnetic core, responsive to a signal by the controller, moves the plunger to a position allowing cessation of engagement between the friction surface and the disc thereby allowing rotation of the motor and movement of the piston.
REFERENCES:
patent: 3420580 (1969-01-01), Dymond
patent: 3790225 (1974-02-01), Wehde
patent: 4308943 (1982-01-01), Gierhart
patent: 4653815 (1987-03-01), Agarwal et al.
patent: 4659970 (1987-04-01), Melocik
patent: 4684838 (1987-08-01), Casanova
patent: 4969756 (1990-11-01), Villec et al.
Gardner Thomas H.
Hammersmith Robert J.
Kowalik James J.
Leppek Kevin G.
Mikhaeil-Boules Naila
General Motors Corporation
Graham Matthew C.
Helms Ernest E.
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