Anti-lock power brake

Details Anti-lock power brake Anti-lock power brake

1978-12-11

1980-07-01

Reger, Duane A.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303 10, B60T 8087

Patent

active

042103690

ABSTRACT:
Controlled braking of a vehicle wheel is provided by inserting between the normal hydraulic pressure applied by the brake pedal and the brake drum or brake disc an hydraulic control system comprising a rotatable clutch and hydraulic pump together with a bypass valve. The arrangement is such that application of braking action on the foot pedal urges the clutch into engagement with the wheel disc or drum so that the clutch will rotate with the disc or drum. The hydraulic pump in turn is coupled to the clutch to rotate with the clutch and provide output hydraulic pressure proportional to the speed of rotation of the clutch. The outlet and inlet of the pump are connected to a bypass valve so that recirculation can take place. A further hydraulic line from the pump outlet connects to the normal friction means hydraulically controlled for engaging the disc or drum to brake the wheel. With this arrangement, when the brakes are initially applied, high hydraulic pressure will be applied to the wheel disc or drum because of the relatively high RPM of the pump. As the wheel slows, the RPM of the pump also decreases, thereby decreasing the hydraulic pressure applied to the friction means engaging the wheel disc or drum.

REFERENCES:
patent: 3743363 (1973-07-01), Hodge et al.
patent: 3801161 (1974-04-01), Sharp

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