Variable capacity pump having a pressure responsive relief valve

Details Variable capacity pump having a pressure responsive relief valve Variable capacity pump having a pressure responsive relief valve

1997-02-07

1998-08-25

Thorpe, Timothy

Pumps

With condition responsive pumped fluid control

Pressure responsive relief or bypass valve

417302, 417304, 137115, F02C 1504, F02C 210

Patent

active

057977321

ABSTRACT:
An oil pump effects a pumping action to deliver oil from an inlet port to a first outlet port and also to a second outlet port. An oil supply passage is connected to the second outlet port. A regulator value has a bore, a spool disposed in the bore, a pressure chamber, and a pressure admission port connected to the oil supply passage and communicating with the pressure chamber. A branch passage connected to the oil supply passage opens to the bore. The regulator valve also has relief port connected to the inlet port and opening to the bore, and a transfer port connected to the first outlet port. The spool disposed in the bore is moveable responsive to pressure within the pressure chamber between a first position in which the transfer port is connected to the branch passage and a second position in which the transfer port is connected to the relief port.

REFERENCES:
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patent: 4412789 (1983-11-01), Ohe et al.
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patent: 4838767 (1989-06-01), Ohe et al.
patent: 5017098 (1991-05-01), Hansen et al.
patent: 5114325 (1992-05-01), Morita
patent: 5226802 (1993-07-01), Nakamura et al.
patent: 5289681 (1994-03-01), Iwata
"Motorfan", Sep. 1991, p. 182.

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