Hydraulic pump and anti-skid brake system

Details Hydraulic pump and anti-skid brake system Hydraulic pump and anti-skid brake system

1981-05-13

1984-06-26

Butler, Douglas C.

Fluid-pressure and analogous brake systems

With pump

188181R, 188344, 188345, 303116, 303119, 417569, B60T 802

Patent

active

044563108

ABSTRACT:
A hydraulic pump with an unloading function which comprises a pump body, a spring chamber formed in the pump body and communicating with a fluid reservoir, a pump chamber formed in the pump body and communicating with the spring chamber and an accumulator through a suction valve and a delivery valve, respectively. An operation chamber is also formed in the pump body and accommodates a drive member such as a pump drive shaft. A plunger slidably extending through a first partition between the spring chamber and the pump chamber, and a tappet having a smaller diameter than that of the plunger and slidably extends through a second partition between the pump chamber and the operation chamber to abut against the plunger. A spring is accommodated in the spring chamber and is adapted to apply a predetermined resilient force to the plunger to bias it toward the tappet.

REFERENCES:
patent: 2796769 (1957-06-01), Gratzmuller
patent: 3227093 (1966-01-01), Taplin
patent: 3521934 (1970-07-01), Leiber
patent: 3840087 (1974-10-01), Von Loewis et al.
patent: 4154326 (1979-05-01), Wolf
patent: 4166657 (1979-09-01), Blomberg et al.

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