Hydraulic pump for power steering

Details Hydraulic pump for power steering Hydraulic pump for power steering

1980-09-15

1982-08-31

Gluck, Richard E.

Pumps

With condition responsive pumped fluid control

Pressure responsive relief or bypass valve

F04B 4902, F04B 4908

Patent

active

043470483

ABSTRACT:
A vane type hydraulic pump for use in a power steering apparatus comprising a pump housing receiving therein a non-rotatable cam ring and non-rotatable but axially slidable pressure plate and subplate. A pump rotor rotatable integrally with a drive shaft is received in an internal cam bore of the cam ring and, when rotated, delivers pressurized fluid to a discharge port connected to the power steering apparatus. The pressure plate and subplate define at a contact portion therebetween a radial low pressure passage, which is fluidically communicated with an axial low pressure hole receiving fluid from a pump reservoir and bypassed fluid from a flow volume control valve. The radially outer portions of the low pressure passage are gradually curved in a direction of rotation of the pump rotor.

REFERENCES:
patent: 2910944 (1959-11-01), Pettibone
patent: 3125028 (1964-03-01), Rohde
patent: 3207077 (1965-09-01), Zeigler et al.
patent: 3901628 (1975-08-01), Bornholt et al.

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