Radial piston pump
AssigneeNissan Motor Co., Ltd.
InventorsSigeaki Yamamuro, Nobuteru Hitomi
Life of this patent
Estimating the term…
Abstract
A variable displacement radial piston pump includes a plurality of pump sections which are grouped into two. A first group of pump sections are communicable through a first discharge passage with a third discharge passage. A second group of pump sections are communicable through a second discharge passage with the third discharge passage. A control valve is provided for selectively supplying discharge from said first and second groups of pump sections to the third discharge passage and thereby stepwisely varying the discharge through the third discharge passage.
Claims25
A variable displacement radial piston pum comprising:
- a drive shaft;
- an eccentric cam means eccentrically arranged on said drive shaft and rotatable therewith;
- a casing formed with a plurality of cylinders spaced and radially arranged around said drive shaft;
- a plurality of pistons respectively installed in said cylinders and having inner ends in contact with said eccentric cam means;
- said cylinders and said pistons cooperating with each other to define a plurality of pump sections which are grouped into two;
- suction passage means for conducting fluid into said pump sections and said shaft is rotated, said eccentric means causing said pistons to reciprocate;
- first discharge passage means communicating with a first group of said pump sections for conducting discharge from said first group of said pump sections as said pistons reciprocate;
- second discharge passage means communciating with a second group of said pump sections for conducting discharge from said second group of said pump sections as said pistons reciprocate;
- third discharge passage means communicable with said first and second discharge passage means for collecting discharge therefrom;
- and
- control valve means for selectively and combindedly supplying fluid from said first and second discharge passage means to said third discharge passage means and thereby stepwisely varying discharge through said third discharge passage means.
A radial piston pump comprising:
- a drive shaft;
- an eccentric cam means eccentrically arranged with said drive shaft and rotatable therewith;
- a casing formed with a plurality of cylinders arranged radially in a circular array around said drive shaft;
- a plurality of pistons respectively installed in said cylinders and having inner ends in contact with said eccentric cam means;
- said cylinders and said pistons cooperating with each other to define a plurality of pump sections;
- suction passage means for conducting fluid into said pump sections as said shaft is rotated, said eccentric cam means reciprocating said piston;
- discharge passage means communicating with said pump sections for conducting discharge from same as said pistons reciprocate;
- each of said pump sections including delivery valves through which fluid is discharged from said pump sections;
- said discharge passage means including a circular discharge passage in which fluid discharged through said delivery valves is collected, each delivery valve having a valve casing disposed in said circular discharge passage and formed with a discharge post, the axis of which is extended circumferentially of said circular discharge passage.
Dependencies are inferred from the claim text.