Functionalties of axially movable spool valve
AssigneeSauer-Danfoss Holding A/S
InventorsH. C. Petersen, Tom Tychsen
Life of this patent
Estimating the term…
Abstract
A valve member includes an axially movable spool valve rotatably mounted in the valve member to cause the way that fluid is communicated between the inlet and outlet ports of the device and the volume chambers thereof. An outer surface of the spool has a configuration to react to fluid pressure to effect the timing between the gear set and the valving of valve member and that the timing therebetween will be adjusted when the spool valve is moved axially. A valve actuator comprising a spring loaded plunger controlled by fluid pressure at the inlet and outlet ports is in physical contact with one end of the valve spool.
Claims3
A rotary fluid pressure device of the type including housing means having a fluid inlet port and a fluid outlet port;
- fluid pressure-operated displacement means associated with said housing means, and including an internally-toothed ring member, and an externally-toothed star member eccentrically disposed within said ring member for relative orbital and rotational movement therebetween to define a plurality of expanding and contracting fluid volume chambers in response to said orbital and rotational movements, and minimum and maximum volume transition chambers;
- a valve member cooperating with said housing mean to provide fluid communication between said inlet port and said expanding volume chambers and between said contracting volume chambers and said outlet port;
- an output shaft and drive shaft means for transmitting said rotational movement from said star member to said output shaft;
- said valve member and said housing means cooperating to define a nominal valve overlap;
- said device being characterized by:
- the valve member having an axially movable spool valve rotatably mounted in the said housing means to cause the way that fluid is communicated between the inlet and outlet ports of the device and the volume chambers thereof.
Dependencies are inferred from the claim text.