Patent ID: 6837046

Claim:
A control device for a proportionally adjustable hydraulic pump ( 1 ) of a closed hydraulic circuit, comprising an axial piston pump that is adjustable from a zero position in two pivoting directions, with an electrohydraulic valve configuration ( 2 ) for the activation of a piston ( 3 ) of the hydraulic pump ( 1 ) from both sides and with a feedback device ( 4 ), which is connected to the piston ( 3 ), which back feeds the position of the piston ( 3 ) to the valve configuration ( 2 ) as a control signal, wherein the valve configuration ( 2 ) has a valve ( 5 , 6 ) for each direction of the piston ( 3 ), and wherein the feedback device ( 4 ) comprises two mechanical feeler elements ( 7 , 8 ), each of which is connected to one of the valves ( 5 , 6 ) and which are in sliding engagement with the piston ( 3 ) in such a way that the feeler elements ( 7 , 8 ) are actuated when it leaves the zero position.