Pumps – Three or more cylinders arranged in parallel – radial – or... – Condition responsive fluid control
Patent
1975-05-22
1976-09-28
Freeh, William L.
Pumps
Three or more cylinders arranged in parallel, radial, or...
Condition responsive fluid control
417295, F04B 104, F04B 4900
Patent
active
039828557
ABSTRACT:
A radial piston pump wherein the drive shaft for the pistons in radially extending cylinders of the housing has an eccentric which moves the pistons outwardly against the opposition of springs. The inlet port of the housing communicates with the cylinders by way of a first passage which contains a reciprocable valve member and can discharge fluid directly into one of the cylinders. The other cylinders receive fluid from the first passage by way of an annular space which surrounds or is adjacent to the inner end of the shaft and bores which are machined in the housing to connect the annular space with the other cylinders. The outlet port of the housing can receive pressurized fluid from the cylinders by way of check valves. The valve member is biased by a spring to normally assume a first position in which it allows fluid to flow from the inlet port to the cylinders as long as the pressure at the outlet port is within a first range of pressures. When the pressure of fluid exceeds such first range, pressurized fluid acts against that end of the valve member which is remote from the valve spring whereby the valve member assumes a second position in which the cylinders are sealed from the inlet port. If the pressure at the outlet port rises still further, the valve member assumes a third position in which the outlet port is in direct communication with the inlet port so that the valve member acts not unlike a safety or pressure relief valve.
REFERENCES:
patent: 2916999 (1959-12-01), Christenson
patent: 3418937 (1968-12-01), Cardillo et al.
patent: 3434428 (1969-03-01), Liles
Aldinger, deceased Ulrich
Aldinger, heir by Karl
Aldinger, heir by Ruth
Freeh William L.
LaPointe G. P.
Robert Bosch G.m.b.H.
Striker Michael J.
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