Patent ID: 11933283
Assignee: DANFOSS POWER SOLUTIONS GMBH & CO. OHG
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 18:
19. A hydraulic unit comprising:
a displacement element;
a servo unit configured to operate the displacement element to set a displacement volume;
a manual displacement control device comprising:
an input shaft mounted rotatable about an input shaft axis in an input shaft block and protruding from the input shaft block with a first end on which a rotating torque is configured to be applied;
a control spool housed in a control housing and moveable by means of rotation of the input shaft for controlling a servo pressure which is configured to be guided to and from the servo unit;
a feedback transmitting element pivotable about a feedback pivot axis parallel to the input shaft axis, having a first end portion for interacting with the control spool, and a second end portion for receiving a mechanical feedback signal of a feedback element connected to the displacement element of the hydraulic unit; and
positioning means for adjusting and fixing a lateral position of the input shaft with respect to the control housing in a direction perpendicular to the input shaft axis and perpendicular to the direction of a centering force exerted on the input shaft by a centering mechanism in order to restore the input shaft to a zero position when no rotating torque is applied to the first end of the input shaft;

wherein the displacement element of the hydraulic unit is tiltable and comprises the feedback element attached thereto, wherein one end of the feedback element is received by the second end portion of the feedback transmitting element; and
wherein the servo unit comprises a servo piston and a servo spring, which are located on opposite sides of the displacement element, and wherein a servo spring bracket providing an end stop surface for a servo spring seat is variably fixable to the hydraulic unit housing in such a manner that the orientation of the end stop surface is adjustable parallel to the displacement element in a neutral position, wherein a first end of a servo spring rod is arranged contacting the servo spring seat and a second end of the servo spring rod is arranged contacting the displacement element such that the servo spring rod is capable of compressing the servo spring via the servo spring seat when the displacement element is tilted out of the neutral position.