Hydraulic pump

Abstract

A hydraulic pump has a housing with an inner toothed ring, and an outer toothed wheel eccentrically mounted within the ring, with pressure pocket space between the teeth of the ring and the wheel. The wheel is eccentrically rotatably and orbitally mounted within the ring. A rotary slide valve is mounted within the wheel. A valve plate with an open center is adjacent the wheel. A rotary slide valve is positioned within the open center of the valve plate. Fluid under pressure in passageways is provided to a front group of pressure pocket spaces to cause the wheel to rotate. A shaft is operatively connected to the wheel.

I claim:  
     
         1 . A hydraulic pump, comprising, 
 a housing means,    an inner toothed ring within the housing,    an outer toothed wheel eccentrically rotatably and orbitally mounted within the inner toothed ring and having upon being energized a rotational speed and an orbital speed within the inner toothed ring, with pressure pocket spaces appearing between the teeth of the ring and wheel,    a hydraulic valve plate having an open center adjacent the means for providing fluid under pressure into a first group of pressure pocket spaces for flow outwardly of the housing through a second group of pressure pocket spaces to cause the wheel to rotate in a first direction, and    a shaft operatively connected to the wheel.    
     
     
         2 . A pump according to  claim 1 , wherein the spaces of the gear wheel have channels, which are connected with the valve.  
     
     
         3 . A pump according to  claim 2 , wherein the valve divides an inner chamber of the gear wheel into two pressure chambers, namely, a high pressure chamber and a low pressure chamber.  
     
     
         4 . A pump according to  claim 1 , wherein the valve has a rotary slide, which rotates with the orbit speed of the gear wheel.  
     
     
         5 . A pump according to  claim 4 , wherein the rotary slide valve is driven directly by the gear wheel.  
     
     
         6 . A pump according to claim, wherein the rotary slide valve is arranged centrally in the gear wheel and has an eccentric spigot joint with the toothed ring, said joint being arranged centrally in relation to the toothed ring.  
     
     
         7 . A pump according to  claim 4 , characterised in that sealing faces are arranged on the rotary slide between the high pressure chamber and the low pressure chamber, the sealing faces bearing on the inside of the gear wheel.  
     
     
         8 . The pump according to  claim 7 , wherein the sealing faces are supported in the circumferential direction with a significant play in relation to the rotary slide valve.  
     
     
         9 . The pump according to  claim 4 , characterised in that the high pressure chamber and the low pressure chamber are in the shape of grooves, with the bottom of these grooves extending in parallel to a tangent on the rotary slide.  
     
     
         10 . The pump according to  claim 4 , wherein one of the two pressure chambers is connected with a recess on one front side of the rotary slide, said recess being connected with a fluid connection via an annular channel.  
     
     
         11 . The pump according to  claim 10 , wherein the other pressure chamber is connected with another fluid connection through the spigot joint.  
     
     
         12 . The pump according to  claim 4 , characterised in that the rotary slide valve is connected to a shaft extending to the outside of the housing.  
     
     
         13 . The pump according to  claim 1 , wherein the toothed ring is not rotatably supported in the housing.  
     
     
         14 . The pump according to  claim 1 , wherein a rear wall is provided with pressure pockets, which cooperate with a front face of the gear wheel.  
     
     
         15 . The pump according to  claim 1 , wherein the two fluid connections are arranged on different axial sides of the gear wheel.  
     
     
         16 . The pump according to  claim 15 , wherein the shaft extends to axial sides of the gear wheel and the two fluid connections extend through the shaft.  
     
     
         17 . The pump according to  claim 1  wherein the means for providing fluid under pressure causes the rotary slide valve to rotate in a direction opposite to the direction of rotation of the wheel.