Gerotor Pump And Motor/Pump Unit

Abstract

The invention relates to a gerotor pump for conveying a fluid from an inlet pump chamber which is connected to an inlet to an outlet pump chamber which is connected to an outlet of the gerotor pump, having a rotatable outer rotor; a rotatable inner rotor which is arranged radially inside the outer rotor, wherein the inner rotor and the outer rotor have rotation axes which are different from each other; a housing having a housing space, in which the outer rotor and the inner rotor are received; and; and a plurality of radially displaceable pressure elements which are arranged on an outer circumference of the outer rotor and which during operation bear on the housing so that between the outer rotor and housing and/or between the outer rotor and the pressure elements pressure chambers which are connected in fluid terms to the inlet pump chamber and/or to the outlet pump chamber are formed. The invention further relates to a motor/pump unit having the gerotor pump.

What is claimed is: 
     
         1 . A gerotor pump for conveying a fluid from an inlet pump chamber which is connected to an inlet to an outlet pump chamber which is connected to an outlet of the gerotor pump having:
 a rotatable outer rotor;   a rotatable inner rotor which is arranged radially inside the outer rotor, wherein the inner rotor and the outer rotor have rotation axes which are different from each other;   a housing having a housing space, in which the outer rotor and the inner rotor are received; and   a plurality of radially displaceable pressure elements which are arranged on an outer circumference of the outer rotor and which during operation bear on the housing so that between the outer rotor and housing and/or between the outer rotor and the pressure elements pressure chambers which are connected in fluid terms to the inlet pump chamber and/or to the outlet chamber pump are formed.   
     
     
         2 . The gerotor pump as claimed in  claim 1 , wherein the housing has along an inner circumference thereof a plurality of housing openings, in particular slots and/or holes, in which a pressure element is at least partially arranged in each case. 
     
     
         3 . The gerotor pump as claimed in  claim 2 , further having a plurality of resilient elements which are in each case arranged in a housing opening and which are configured to pretension the respective pressure element with respect to the outer rotor. 
     
     
         4 . The gerotor pump as claimed in  claim 1 , wherein the outer rotor along the outer circumference thereof has a plurality of openings, in particular slots and/or holes, in which a pressure element is at least partially arranged in each case, wherein the openings are in each case connected in fluid terms to the inlet pump chamber and/or to the outlet pump chamber. 
     
     
         5 . The gerotor pump as claimed in  claim 1 , wherein the housing has a housing cover and a housing base between which the inner rotor and the outer rotor are arranged and wherein the housing cover and/or the housing base have grooves which together with intermediate spaces between the inner rotor and the outer rotor form the inlet and outlet pump chambers. 
     
     
         6 . The gerotor pump as claimed in  claim 1 , wherein the pressure elements are in each case rotary disks. 
     
     
         7 . The gerotor pump as claimed in  claim 6 , wherein a height of the rotary disks in an axial direction of the outer rotor is smaller than a height of the outer rotor or a height of the housing in an axial direction. 
     
     
         8 . The gerotor pump as claimed in  claim 6 , wherein the rotary disks at least partially separate the housing space in a circumferential direction of the outer rotor and during operation pressure chambers are formed at least between the rotary disks in the circumferential direction. 
     
     
         9 . The gerotor pump as claimed in  claim 2 , wherein the pressure elements are in each case pistons. 
     
     
         10 . The gerotor pump as claimed in  claim 9 , wherein the respective piston seals a radially housing-side end of the opening and, during operation with a radial inner side of the opening, which is connected in fluid terms to the inlet pump chamber and/or to the outlet pump chamber, forms a piston pressure chamber. 
     
     
         11 . The gerotor pump as claimed in  claim 1 , wherein the outer rotor and the housing space have center point axes which are different from each other perpendicularly to the radial direction. 
     
     
         12 . A motor/pump unit having:
 a gerotor pump as claimed in  claim 1 ; and   a motor, which is connected to the inner rotor and which is configured to rotate the inner rotor in order to operate the gerotor pump.