Hydraulic machine

Abstract

A hydraulic machine having a variable intake volume/pump capacity includes working spaces ( 8 ) disposed in a cylinder ( 2 ), each of the working spaces ( 8 ) being limited by a piston ( 6 ) and a cylinder bore ( 4 ) in which the piston ( 6 ) is accommodated. The pistons ( 6 ) are supported on a reciprocating element ( 14 ) that rotates relative to the pistons ( 6 ), and therefore when the cylinder ( 2 ) rotates relative to the pistons ( 6 ), the pistons ( 6 ) undergo a displacement that determines the volume of the working spaces ( 8 ) which can be connected to high pressure and low pressure, to a control unit for actuating the valves ( 16, 22 ) as a function of the displacement of the particular piston ( 6 ), and to an angle-of-rotation sensor ( 36 ). The angle-of-rotation sensor ( 36 ) has a Gray code track ( 60 ) and an incremental track ( 58 ), to each of which at least one sensor ( 72, 74 ) is assigned.

1 . A hydraulic machine having a variable intake volume/pump capacity, comprising:
 a cylinder ( 2 );   at least one piston ( 6 );   a plurality of working spaces ( 8 ) disposed in the cylinder ( 2 ), each of the working spaces ( 8 ) being limited by the at least one piston ( 6 ) and at least one cylinder bore ( 4 ) in which the at least one piston ( 6 ) is accommodated;   a reciprocating element ( 14 ), wherein the pistons ( 6 ) are supported directly or indirectly on the reciprocating element ( 14 ), wherein said reciprocating element ( 14 ) is configured to rotate relative to the at least one piston ( 6 ), such that when the cylinder ( 2 ) rotates relative to the at least one piston ( 6 ), the at least one piston ( 6 ) undergoes a displacement that determines the volume of the working spaces ( 8 );   a control unit;   high-pressure valves and low-pressure valves ( 16 ,  22 ), wherein said working spaces ( 8 ) are connected via said high-pressure valves and low-pressure valves ( 16 ,  22 ) to high pressure and low pressure, and to the control unit, wherein said control unit is configured to actuate the valves ( 16 ,  22 ) as a function of a displacement of one of said at least one piston ( 6 );   an angle-of-rotation sensor ( 36 ), wherein said working spaces ( 8 ) are further connected to said angle-of-rotation sensor ( 36 ), wherein said angle-of-rotation sensor is configured to detect the rotational angle position of a rotating component ( 2 ,  14 ), wherein the angle-of-rotation sensor ( 36 ) has a Gray code track ( 60 ) and an incremental track ( 58 ), wherein at least one sensor ( 72 ,  74 ) is assigned to each of said Gray code track ( 60 ) and said incremental track ( 58 ).   
     
     
         2 . The hydraulic machine according to  claim 1 , wherein the Gray code track and the incremental track ( 58 ,  60 ) are located on a circumference of a base body ( 48 ), and the sensors ( 72 ,  74 ) are distributed along the circumference. 
     
     
         3 . The hydraulic machine according to  claim 2 , wherein the Gray code track and the incremental track ( 58 ,  60 ) are offset in an axial direction. 
     
     
         4 . The hydraulic machine according to  claim 3 , wherein a plurality of sensors ( 74 ,  72 ) is assigned to one track ( 58 ,  60 ). 
     
     
         5 . The hydraulic machine according to  claim 4 , wherein five sensors ( 72 ) are assigned to the Gray code track ( 60 ), and one sensor ( 74 ) is assigned to the incremental track ( 58 ). 
     
     
         6 . The hydraulic machine according to  claim 1 , wherein the incremental track ( 58 ) has 72 track sections ( 62 ), and the Gray code track has 36 track sections ( 64 ). 
     
     
         7 . The hydraulic machine according to  claim 4 , wherein the Gray code track ( 60 ) is selected such that a total of only one bit ever changes for the sensor ( 72 ) assigned to said Gray code track ( 6 ) when rotated by a track section. 
     
     
         8 . The hydraulic machine according to  claim 1 , wherein the base body ( 48 ) is fastened to a drive shaft or output shaft ( 12 ). 
     
     
         9 . The hydraulic machine according to  claim 8 , wherein the sensors ( 72 ,  74 ) are accommodated on a housing side in a holder ( 76 ). 
     
     
         10 . The hydraulic machine according to  claim 1 , wherein the Gray code track ( 60 ) and the incremental track ( 58 ) run in the pressure medium. 
     
     
         11 . The hydraulic machine according to  claim 1 , wherein the angle-of-rotation sensor is a magnetic sensor. 
     
     
         12 . The hydraulic machine according to  claim 9 , wherein the holder ( 76 ) is sealed against a pressure medium. 
     
     
         13 . The hydraulic machine according to  claim 8 , wherein the base body ( 48 ) is has an end face, wherein said base body ( 48 ) is fastened on the end face to the drive shaft or output shaft ( 12 ) and is covered by a housing cover ( 42 ). 
     
     
         14 . The hydraulic machine according to  claim 1 , wherein said hydraulic machine has an axial-piston design or a radial-piston design.