Oscillating piston pump for fluids

Abstract

The invention relates to an oscillating piston pump for liquid and gaseous fluids, comprising: a pump housing having at least two sector-shaped working chambers, which are diametrically opposed relative to a pivot axis arranged in-between; an oscillating piston, having at least two displacement portions which extend diametrically relative to the pivot axis and are each received pivotably in one of the working chambers; an electric drive, which moves the oscillating piston alternately on a pivot movement between two turning points delimited within the working chambers; a group of outlet valves, which ensure the discharge of a volume displaced from the working chambers to a pump outlet; and a group of inlet valves, which ensure the entry of a volume flowing into the working chambers from a pump inlet. The group of outlet valves or inlet valves is arranged on both sides of each working chamber and communicates through the pump housing with the pump outlet or the pump inlet. The other group of inlet valves or outlet valves is arranged in the oscillating piston and communicates via a cavity in the oscillating piston with the pump inlet or the pump outlet.

1 . A swivel piston pump for liquid and gaseous fluids, comprising:
 a pump housing having at least two sector-shaped working chambers opposing each other diametrically with respect to a pivot axis positioned therebetween;   a swivel piston having at least two displacement sections which extend diametrically with respect to the pivot axis and which are each received in a swiveling manner in one of the working chambers;   an electrical drive which moves the swivel piston alternately between two turning points on a pivoting motion contained within the working chamber;   a set of outlet valves which allow a volume displaced from the working chambers to exit toward a pump outlet; and a set of inlet valves which allow a volume flowing into the working chambers to enter from a pump inlet; wherein   at least one of the set of outlet valves and set of inlet valves) is arranged on both sides of each working chamber and communicates with one of the pump outlet or and pump inlet through the pump housing; and   configured such that the other set of the inlet valves or set of the outlet valves is disposed in the swivel piston and communicates with the pump inlet or pump outlet via a cavity in the swivel piston.   
     
     
         2 . The swivel piston pump according to  claim 1 , wherein the cavity of the swivel piston is opened towards an axial side relative to the pivot axis, and an orifice of the pump inlet or pump outlet facing the swivel piston is formed in the pump housing so as to overlap an opened cross-section of the cavity). 
     
     
         3 . The swivel piston pump according to  claim 1 , wherein the opened cross-section of the cavity extends annularly around the pivot axis, and the orifice of the pump inlet or pump outlet is disposed centrally with respect to the pivot axis. 
     
     
         4 . The swivel piston pump according to  claim 1 , wherein the cavity takes the form of a hollow space matching the outer contour of the swivel piston. 
     
     
         5 . The swivel piston pump according to  claim 1 , wherein the swivel piston is produced as a molded plastic part having an overmolded steel shaft as the pivot axis. 
     
     
         6 . The swivel piston pump according to  claim 1 , wherein the outlet valves are formed by flexible lock vanes which release an outlet side of a valve opening. 
     
     
         7 . The swivel piston pump according to  claim 1 , wherein the inlet valves are each formed by an arrangement of prisms of triangular cross-section which are flexibly movable with respect to each other, said prisms being disposed with an apex edge of the cross-section facing a flow direction and being disposed perpendicularly facing a shut-off direction with a lateral side of the cross-section. 
     
     
         8 . The swivel piston pump according to  claim 1 , wherein the electrical drive is configured as a rotary solenoid drive having an armature which can be pivoted electromagnetically around a pivot axis between two working points, and is fixed non-rotatably with the swivel piston. 
     
     
         9 . The swivel piston pump according to  claim 1   7 , wherein the electrical drive is configured as an electrically rotating motor that is coupled to the swivel piston via an eccentric actuator mechanism. 
     
     
         10 . A method of using a swivel piston pump according to  claim 1  for pumping liquid and/or gaseous fluids. 
     
     
         11 . A method of using a swivel piston pump according to  claim 1  as a lubricating oil pump for a transmission.