Neutral setting device of an adjustable hydraulic unit
AssigneeDanfoss Power Solutions GmbH & Co. OHG
InventorsPeter Bahna, Reinhardt Thoms, Andrej Babusa
Life of this patent
Estimating the term…
Abstract
Manual displacement control device (MDC) for hydraulic units has an input shaft mounted rotatably about an input shaft axis in an input shaft block. The input shaft protrudes from the input shaft block with a first end, onto which a rotating torque can be applied. The MDC further includes a control spool housed in a control housing, which is moveable by rotating the input shaft for controlling a servo pressure. The control device is configured for adjusting and fixing the 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 restoring force exerted on the input shaft.
Claims16
A manual displacement control device for variable displacement hydraulic units equipped with a servo unit capable of operating a displacement element in order to set a displacement volume, the 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 a 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 a displacement element of a hydraulic unit;
- 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.
A hydraulic unit comprising:
- a displacement element;
- a servo unit configured to operate the displacement element to set a displacement volume;
- and
- 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 to control 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 which is parallel to the input shaft axis, having a first end portion that interacts with the control spool and a second end portion that receives 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.
Dependencies are inferred from the claim text.