Hydraulic pump

Details Hydraulic pump Hydraulic pump

1986-04-21

1987-07-21

Freeh, William L.

Pumps

With condition responsive pumped fluid control

Fluid flow rate responsive

417310, F04B 4900

Patent

active

046815171

ABSTRACT:
A hydraulic pump with a falling characteristic curve in respect of the output flow relative to the pump speed. A flow control valve (40) has a spool (41) with a hollow (50) extension portion (49), and an annular chamber (52) with two control edges (53, 56) which co-operate with the valve output duct (38) and a relief duct (19) to form restrictor means which are in opposition to each other. The valve output duct (38) and the relief duct (19) are disposed substantially radially with respect to the spool.

REFERENCES:
patent: 3349714 (1967-10-01), Griewier
patent: 3723025 (1973-03-01), Coakley
patent: 4396033 (1983-08-01), Warumi
patent: 4549566 (1985-10-01), Fujiwara

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