Axial-piston machine of the swashplate or oblique-axis type of construction

Abstract

In an axial-piston machine of the swashplate or oblique-axis type of construction, a contact face of the cylinder head ( 1 ) is pressed against a stationary sealing face. The contact face has located in it transition orifices ( 15 a ) for the exchange of hydraulic fluid between the cylinder head ( 1 ) and the stationary part. The transition orifices ( 15 a ) are located on a raised annular collar ( 13 ) of the end face ( 11 ) of the cylinder head ( 1 ). Microgrooves ( 21 ) are recessed in the annular collar ( 13 ) between the individual transition orifices ( 15 a ), so that, of the supporting face, only two edge webs ( 13 a, 13 b ) remain. The depth of the microgrooves ( 21 ) is only a few hundredths of a millimeter. This design prevents a hydrodynamic carrying effect between the cylinder head and the stationary part.

1 . Axial-piston machine of the swashplate or oblique-axis type of construction, with a rotating cylinder block, with displacer spaces which are arranged in the form of a ring in the cylinder block and run parallel to the axis of rotation of the cylinder block and in which pistons are received slideably, with transition orifices of the displacer spaces, the said transition orifices issuing into an end contact face of the cylinder block, and with a stationary supporting face for the end contact face of the cylinder block, the supporting face having provided in it orifices which are connected alternately to the transition orifices of the cylinder block during the rotation of the latter, and the contact face of the cylinder block and the supporting face being pressed against one another in a sealed-off manner, wherein the improvement comprises: 
 the formation of microgrooves ( 21 ) in the end contact face ( 14 ) of the cylinder block ( 1 ) between adjacent transition orifices ( 15   a ).    
   
   
       2 . Axial-piston machine according to  claim 1 , in which the end contact face ( 14 ) is located on an annular collar ( 13 ) projecting from the remaining end face ( 11 ) of the cylinder block ( 1 ) wherein the improvement further comprises: the microgrooves ( 21 ) form segments of an annular groove running within the annular collar ( 13 ) and extending over all the transition orifices ( 15   a ).  
   
   
       3 . Axial-piston machine according to  claim 1 , wherein the improvement further comprises: the individual displacer spaces ( 8 ) of the cylinder block ( 1 ) merge in the form of a block kidney ( 15 ) into their transition orifice ( 15   a ), the individual transition orifices ( 15   a ) being in the form of annular segments in the shape of an arc of a circle.  
   
   
       4 . Axial-piston machine according to  claim 2 , wherein the improvement further comprises: the individual displacer spaces ( 8 ) of the cylinder block ( 1 ) merge in the form of a block kidney ( 15 ) into their transition orifice ( 15   a ), the individual transition orifices ( 15   a ) being in the form of annular segments in the shape of an arc of a circle.  
   
   
       5 . Axial-piston machine according to  claim 1 , wherein the improvement further comprises: the orifices ( 17 ) in the stationary supporting face ( 12 ) have a kidney-shaped design and are separated from one another by sealing webs ( 18 ), and in that reversal notches ( 20 ) issue from the kidney-shaped orifices ( 17 ) into the sealing webs ( 18 ) in such a way that, when the contact face ( 14 ) of the cylinder block ( 1 ) sweeps over the stationary supporting face ( 12 ), a transition orifice ( 15   a ) can briefly connect two adjacent kidney-shaped orifices ( 17 ).  
   
   
       6 . Axial-piston machine according to  claim 2 , wherein the improvement further comprises: the orifices ( 17 ) in the stationary supporting face ( 12 ) have a kidney-shaped design and are separated from one another by sealing webs ( 18 ), and in that reversal notches ( 20 ) issue from the kidney-shaped orifices ( 17 ) into the sealing webs ( 18 ) in such a way that, when the contact face ( 14 ) of the cylinder block ( 1 ) sweeps over the stationary supporting face ( 12 ), a transition orifice ( 15   a ) can briefly connect two adjacent kidney-shaped orifices ( 17 ).  
   
   
       7 . Axial-piston machine according to  claim 3 , wherein the improvement further comprises: the orifices ( 17 ) in the stationary supporting face ( 12 ) have a kidney-shaped design and are separated from one another by sealing webs ( 18 ), and in that reversal notches ( 20 ) issue from the kidney-shaped orifices ( 17 ) into the sealing webs ( 18 ) in such a way that, when the contact face ( 14 ) of the cylinder block ( 1 ) sweeps over the stationary supporting face ( 12 ), a transition orifice ( 15   a ) can briefly connect two adjacent kidney-shaped orifices ( 17 ).  
   
   
       8 . Axial-piston machine according to  claim 4 , wherein the improvement further comprises: the orifices ( 17 ) in the stationary supporting face ( 12 ) have a kidney-shaped design and are separated from one another by sealing webs ( 18 ), and in that reversal notches ( 20 ) issue from the kidney-shaped orifices ( 17 ) into the sealing webs ( 18 ) in such a way that, when the contact face ( 14 ) of the cylinder block ( 1 ) sweeps over the stationary supporting face ( 12 ), a transition orifice ( 15   a ) can briefly connect two adjacent kidney-shaped orifices ( 17 ).  
   
   
       9 . Axial-piston machine according to  claim 1 , characterized in that the stationary supporting face ( 12 ) is the end face of a valve plate ( 5 ).  
   
   
       10 . Axial-piston machine according to  claim 5 , characterized in that the stationary supporting face ( 12 ) is the end face of a valve plate ( 5 ).  
   
   
       11 . Axial-piston machine according to  claim 6 , characterized in that the stationary supporting face ( 12 ) is the end face of a valve plate ( 5 ).  
   
   
       12 . Axial-piston machine according to  claim 7 , characterized in that the stationary supporting face ( 12 ) is the end face of a valve plate ( 5 ).  
   
   
       13 . Axial-piston machine according to  claim 8 , characterized in that the stationary supporting face ( 12 ) is the end face of a valve plate ( 5 ).  
   
   
       14 . Axial-piston machine according to  claim 9 , characterized in that the stationary supporting face ( 12 ) is the end face of a valve plate ( 5 ).  
   
   
       15 . Axial-piston machine according to  claim 1 , wherein the improvement further comprises: the depth of the microgroove, starting from the contact face ( 14 ) of the cylinder block ( 1 ), is in the range of between 5 and 200 μm, preferably of between 10 and 100 μm.  
   
   
       16 . Axial-piston machine according to  claim 2 , wherein the improvement further comprises: the depth of the microgroove, starting from the contact face ( 14 ) of the cylinder block ( 1 ), is in the range of between 5 and 200 μm, preferably of between 10 and 100 μm.  
   
   
       17 . Axial-piston machine according to  claim 3 , wherein the improvement further comprises: the depth of the microgroove, starting from the contact face ( 14 ) of the cylinder block ( 1 ), is in the range of between 5 and 200 μm, preferably of between 10 and 100 μm.  
   
   
       18 . Axial-piston machine according to  claim 4 , wherein the improvement further comprises: the depth of the microgroove, starting from the contact face ( 14 ) of the cylinder block ( 1 ), is in the range of between 5 and 200 μm, preferably of between 10 and 100 μm.  
   
   
       19 . Axial-piston machine according to  claim 8 , wherein the improvement further comprises: the depth of the microgroove, starting from the contact face ( 14 ) of the cylinder block ( 1 ), is in the range of between 5 and 200 μm, preferably of between 10 and 100 μm.  
   
   
       20 . Axial-piston machine according to  claim 14 , wherein the improvement further comprises: the depth of the microgroove, starting from the contact face ( 14 ) of the cylinder block ( 1 ), is in the range of between 5 and 200 μm, preferably of between 10 and 100 μm.