Axial piston machine having an adjustable bent axis valve segment and a variable unit for the electrically proportional adjustment of the displacement

Abstract

The invention relates to an axial piston machine having an bent axis segment which is adjustable by means of an actuating piston, and a variable unit for the electrically proportional adjustment of the displacement. The variable unit has a control piston for controlling the oil pressure which displaces the actuating piston, an electrically controllable proportional solenoid which acts on the control piston, a feedback spring on the control piston for retracting the instantaneous Bent axis valve segment and a adjustment mechanism for setting the start current. To set the start current, the adjustment mechanism has a setting spring which acts on the armature of the proportional solenoid with an adjustable force.

1 . Axial piston machine having a Bent axis valve segment which is adjustable by means of an actuating piston, and a variable unit ( 2 ) for the electrically proportional adjustment of the displacement, which has a control spool ( 7 ) for controlling the oil pressure which displaces the actuating piston ( 10 ), an electrically controllable proportional solenoid ( 3 ) which acts on the control spool ( 7 ), a feedback spring ( 9 ) on the control spool ( 7 ) for retracting the instantaneous Bent axis valve segment and a adjustment mechanism ( 16 ) for setting the start current, the adjustment mechanism ( 16 ) having a setting spring ( 4 ) which acts on the armature ( 5 ) of the proportional solenoid ( 3 ) with an adjustable force. 
   
   
       2 . Axial piston machine according to  claim 1 , in which the force of the setting spring ( 4 ) is directed counterto the force of the feedback spring ( 9 ) 
   
   
       3 . Axial piston machine according to  claim 1 , in which the setting spring ( 4 ) is integrated into the proportional solenoid ( 3 ). 
   
   
       4 . Axial piston machine according to  claim 1 , in which the setting spring ( 4 ) and the armature ( 5 ) of the proportional solenoid ( 3 ) and also the control valve are arranged along a common axis. 
   
   
       5 . Axial piston machine according to  claim 1 , in which the setting spring ( 4 ), the armature ( 5 ), the control spool ( 7 ), the feedback spring ( 9 ) and the actuating piston ( 10 ) are arranged along a common axis. 
   
   
       6 . Axial piston machine according to  claim 1 , in which the feedback spring ( 9 ) is held at one side by a bore of the actuating piston ( 10 ) and rests at the other side on the control spool ( 7 ) via a spring seat ( 8 ) 
   
   
       7 . Axial piston machine according to  claim 1 , in which the setting spring ( 4 ) force which acts on the armature ( 5 ) is adjustable by means of a adjustment screw ( 17 ) which is arranged in the longitudinal direction of the Bent axis.