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1. WO2012054969 - A NEW MECHANISM FOR FLUID POWER TRANSMISSION AND CONTROL

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

The claims define the invention as follows:

1. A mechanism that transfers rotary motion to axial straight motion,

comprising:

A. A spool is defined by at least one group of helical grooves that is in

axial symmetry, at least partially recessed into the spool's cylindrical surface, each group consists of at least two helical grooves which are in permanent flow communication with the relative chamber(s);

B. A sleeve has two groups of ports on the surface of the axial bore that is associated with the aforementioned spool and each group consists of at least two ports located in axial symmetry, whereby one group of ports (ports P), is in permanent flow communication with the pressure line, and the other group (ports T), is in permanent flow

communication with the return line;

C. At least two unconnected sensitive chambers urge the spool in

opposing directions and at least one sensitive chamber operates in the way that the fluid pressure in it is controlled by the angular displacing of the said helical grooves, which are in permanent flow

communication with it;

whereby each helical groove operates in a way that it opens directly to port(s) P as the spool rotates in one direction, alternatively it will open directly to port(s) T as the spool rotates in the opposite direction.

2.

3.

4. The sensitive chambers mentioned in claim 1 are built up in other parts and they cause negative feedback motion as a response to the relative input movement between the said spool and the said sleeve.

5.

6.

7.

8.

9. The spool mentioned in claim 1 is spring centered.

10. Other functional lands of a main spool are configured on the cylindrical surface of the spool mentioned in claim 1.

11. The spool mentioned in claim 1 is structured with a rod at least on one end.

12. The functions of the sleeve that is mentioned in claim 1 are accomplished by other part(s), at least partially housing the said spool.

13. The spool mentioned in claim 11 is structured so that the rod extending is substituted by a coupling operable coupled to the said spool.