Hydraulic pressure supply pump with multiple sequential plungers

Details Hydraulic pressure supply pump with multiple sequential plungers Hydraulic pressure supply pump with multiple sequential plungers

1996-09-06

1998-06-23

Thorpe, Timothy

Pumps

Three or more cylinders arranged in parallel, radial, or...

Radial cylinders

92 72, 417462, F04B 104, F04B 2704

Patent

active

057696110

ABSTRACT:
A plurality of plungers situated radially in a pump body, are sequentially actuated inwardly by a rotatably driven, eccentrically mounted actuating ring. A central valve housing is coaxially received within the body and includes a fuel inlet chamber and a fuel discharge chamber, which are closely axially aligned. The pump body closely engages the valve housing such that radially extending bores in the body and a portion of the valve housing between the inlet and discharge chambers, together define the pumping chambers. All pumping chambers are connected via short passages in the valve housing, to the common inlet chamber and the common outlet chamber. This configuration, by which all fuel passages and associated valves subject to the pumping pressure are within the central valve housing, not only minimizes the dead volume, but keeps all fuel flows confined within a radius that is smaller than the actuator ring sliding radius, i.e., where the actuating ring contacts the outer ends of the plungers or cam shoes at the outer end of the plungers. As a result, engine or other high viscosity (i.e., "lube oil") can be used to lubricate the sliding surfaces.

REFERENCES:
patent: 2461121 (1949-02-01), Markham
patent: 3204561 (1965-09-01), Roosa
patent: 4662825 (1987-05-01), Djordjevic
patent: 4915592 (1990-04-01), Hishinuma et al.
patent: 4975025 (1990-12-01), Yamamura et al.
patent: 5391059 (1995-02-01), Hallundbaek
patent: 5513965 (1996-05-01), Nakamura et al.
patent: 5573386 (1996-11-01), Schmitt et al.

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