US2014271299A1PendingUtilityA1

Hydraulically balanced stepwise variable displacement vane pump

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Individually held — no corporate assignee on recordPriority: Mar 14, 2013Filed: Mar 14, 2013Published: Sep 18, 2014
Est. expiryMar 14, 2033(~6.6 yrs left)· nominal 20-yr term from priority
Inventors:Albert WongThomas C. RytlewskiJohn S. Beam
F04C 14/02F01C 21/0863F04C 2/3446F04C 15/06F04C 11/001F04C 2/22
41
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Claims

Abstract

A binary vane pump providing a balanced, stepwise variable displacement is provided. The binary vane pump includes a pressure plate having first and second discharge ports configured to discharge fluid from the binary vane pump to a first discharge path and a thrust plate having third and fourth discharge ports configured to discharge fluid from the binary vane pump to a second discharge path. The binary vane pump also includes a ring positioned axially between the pressure plate and thrust plate, the ring having an inner cam surface, a rotor rotatably disposed within the ring, the rotor having a plurality of slots and a plurality of vanes received and movable within respective slots, and a shaft extending along an axis through the rotor and configured to rotate the rotor so that the vanes are rotatable within the ring.

Claims

exact text as granted — not AI-modified
Having thus described the invention, it is claimed: 
     
         1 . A binary vane pump comprising:
 a pressure plate including a first discharge port and a second discharge port configured to discharge fluid from the binary vane pump to a first discharge path;   a thrust plate including a third discharge port and a fourth discharge port configured to discharge fluid from the binary vane pump to a second discharge path;   a ring positioned axially between the pressure plate and thrust plate, the ring having an inner cam surface;   a rotor rotatably disposed within the ring, the rotor comprising a plurality of slots and a plurality of vanes, vanes of the plurality vanes corresponding to respective slots of the plurality of slots and radially movable with the respective slots; and   a shaft extending along an axis through the rotor and configured to rotate the rotor so the vanes are rotatable within the ring.   
     
     
         2 . The binary vane pump of  claim 1 , wherein the ring defines an elongated main chamber having a minor diameter and a major diameter. 
     
     
         3 . The binary vane pump of  claim 2 , wherein the rotor and vanes are positioned within the ring to divide the main chamber into a first pumping chamber at one side of the minor axis and a second pumping chamber at another side of the minor axis. 
     
     
         4 . The binary vane pump of  claim 3 , wherein the first discharge port and third discharge port are in fluid communication with the first pumping chamber and the second discharge port and fourth discharge port are in fluid communication with the second pumping chamber. 
     
     
         5 . The binary vane pump of  claim 4 , wherein the first discharge port and second discharge port are positioned diametrically opposite to one another. 
     
     
         6 . The binary vane pump of  claim 5 , wherein the third discharge port and fourth discharge port are positioned diametrically opposite to one another. 
     
     
         7 . The binary vane pump of  claim 6 , wherein the second discharge path is selectively separated from the first discharge path by a check valve. 
     
     
         8 . The binary vane pump of  claim 7 , wherein the second discharge path is in fluid communication with a low pressure reservoir when the second discharge path is separated from the first discharge path by the check valve. 
     
     
         9 . The binary vane pump of  claim 1 , wherein the pressure plate further comprises at least one first undervane port configured to supply a first undervane pressure. 
     
     
         10 . The binary vane pump of  claim 9 , wherein the first undervane pressure urges the plurality of vanes into contact with the inner cam surface. 
     
     
         11 . The binary vane pump of  claim 10 , wherein the thrust plate further comprises at least one second undervane port configured to supply a second undervane pressure. 
     
     
         12 . The binary vane pump of  claim 11 , wherein the second undervane pressure urges the plurality of vanes into contact with the inner cam surface. 
     
     
         13 . The binary vane pump of  claim 1 , wherein the thrust plate further comprises at least one second undervane port configured to supply a second undervane pressure. 
     
     
         14 . The binary vane pump of  claim 13 , wherein the second undervane pressure urges the plurality of vanes into contact with the inner cam surface.

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