Patent ID: 7415821

Claim:
A hydraulic motor unit with a hydraulic motor ( 1 ′) which is capable of being connected to two working lines ( 3 , 4 ), the swash-plate angle (α) of the hydraulic motor ( 1 ′) being capable of being adjusted by an adjusting device ( 7 ) which exhibits an actuating piston ( 8 ) with two piston faces ( 9 , 10 ), the actuating pressure which acts on a first piston face ( 10 ) in an actuating-pressure chamber ( 12 ) being capable of being set by an actuating-pressure regulating valve ( 13 ), the actuating-pressure regulating valve ( 13 ) being capable of being adjusted between two end positions, and in a first actuating direction of the actuating-pressure regulating valve ( 13 ) an actuating force acts which is proportional to the pressure in a working line ( 3 , 4 ), and in a second, opposite actuating direction of the actuating-pressure regulating valve ( 13 ) a control-pressure piston ( 34 ) acts with a force which is dependent on the control pressure only when a limiting value of a control pressure in a control-pressure supply line ( 28 , 28 ′) is exceeded, characterised in that for the purpose of setting a defined swash-plate angle (α) of the hydraulic motor ( 1 ′) in the case of pressure inversion in the working lines ( 3 , 4 ) the travel of the actuating piston ( 8 ) in the direction of large swash-plate angles is limited by a variable stroke-limiting mechanism ( 40 ) acting on the actuating piston ( 8 ).