Back to results
US 7,730,826 B2Granted
Swashplate type axial piston device having apparatus for providing three operating displacements
AssigneeSauer-Danfoss Inc.
InventorsAaron Becker, Branko Joseph Horvat, Jr.
Life of this patent
Estimating the term…
Abstract
An axial piston hydraulic device. The device has a housing that uses a servo piston in order to control the displacement of a swashplate within the device. By using a servo member disposed within a cavity of an end cap on the housing the axial piston hydraulic device is able to provide three operating positions depending on the angle of the swashplate.
Claims8
An axial piston hydraulic device comprising:
- a housing having a cylinder block therein with reciprocating pistons that are acted upon by a swashplate;
- a first servo piston connected to the swashplate adjacent a first end;
- an end cap having a cavity disposed therein secured to the housing;
- and
- a moveable servo member disposed within the cavity of the end cap and receiving the servo piston to provide at least three operating conditions;
- wherein a servo fill port is disposed within the servo member to provide pressure within a cavity of the servo member;
- and
- wherein the end cap has a first port to pressurize the cavity of the end cap and a second port in communication with the servo fill port to pressurize the cavity of the servo member;
- wherein a biasing member biases the servo member and servo piston to a first position;
- wherein pressurization of the first port to a first threshold pressure moves the servo member and servo piston a first distance from the first position;
- wherein pressurization of the second port to a second threshold pressure moves the servo piston a second distance from the first position;
- and
- wherein the first distance is less than the second distance.
10 more elements
An axial piston hydraulic device comprising:
- a housing having a cylinder block therein with reciprocating pistons that are acted upon by a swashplate;
- a servo piston connected to the swashplate adjacent a first end;
- an end cap having a cavity disposed therein secured to the housing;
- and
- a moveable servo can having a sidewall extending from an end wall disposed within the cavity of the end cap and receiving the servo piston to provide at least three operating conditions
- wherein the end cap has a first port in communication with the cavity of the end cap to provide pressure within the cavity of the end cap;
- and
- wherein the end cap has a second port in communication with a servo fill port disposed within the servo can to provide pressure within a cavity of the servo can;
- wherein a biasing member biases the servo member and servo piston to a first position;
- wherein pressurization of the first port to a first threshold pressure moves the servo member and servo piston a first distance from the first position;
- wherein pressurization of the second port to a second threshold pressure moves the servo piston a second distance from the first position;
- and
- wherein the first distance is less than the second distance.
10 more elements
Dependencies are inferred from the claim text.