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US 7,065,964 B2Granted
Hydrostatic transmission
AssigneeHydro-Gear Limited Partnership
InventorsRaymond Hauser, Alan W. Johnson
Life of this patent
Estimating the term…
Abstract
An improved compact design for a hydrostatic transmission having a hydraulic pump and hydraulic motor mounted on a center section in a housing, wherein the pump and motor are mounted at generally right angles to one another, and the longitudinal axis of the input shaft is located between a first and second parallel planes located at respective ends of the motor shaft and the longitudinal axis of the motor shaft is located between a third and fourth parallel planes located at respective ends of the pump shaft.
Claims17
A center section for a hydraulic drive apparatus, comprising:
- a first running surface comprising a first pair of arcuate ports formed thereon;
- a second running surface perpendicular to the first running surface and comprising a second pair of arcuate ports formed thereon;
- a first system port formed in the center section and connecting one of the first pair of arcuate ports to one of the second pair of arcuate ports;
- a second system port formed in the center section and connecting the other of the first pair of arcuate ports to the other of the second pair of arcuate ports;
- and
- a first check valve located in the center section and connected to the first system port and a second check valve located in the center section and connected to the second system port, each check valve comprising a valve body located in a check valve opening formed on an external surface of the center section;
- wherein at least a portion of at least one system port and the entire body of at least one of the check valve bodies is located directly below the first running surface, whereby a line perpendicular to and through the first running surface intersects both the one check valve body and the portion of the system port.
4 more elements
A center section for a hydraulic drive apparatus, comprising:
- a first running surface comprising a first pair of arcuate ports formed thereon;
- a second running surface perpendicular to the first running surface and comprising a second pair of arcuate ports formed thereon;
- a first system port formed in the center section and connecting one of the first pair of arcuate ports to one of the second pair of arcuate ports, wherein at least a portion of the first system port is located directly below the first running surface;
- a second system port formed in the center section and connecting the other of the first pair of arcuate ports to the other of the second pair of arcuate ports;
- a first check valve connected to the first system port, the first check valve comprising a first valve body located in a first check valve opening formed on an external surface of the center section, wherein at least a portion of the first valve body is located directly below one of the first pair of arcuate ports;
- and
- a second check valve connected to the second system port, the second check valve comprising a second valve body located in a second check valve opening formed on the external surface of the center section.
4 more elements
A center section for a hydraulic drive apparatus, comprising:
- a pump running surface for mounting a rotatable pump cylinder block;
- a motor running surface formed perpendicular to the pump running surface for mounting a rotatable motor cylinder block;
- hydraulic porting formed in the center section and comprising first and second system ports, first and second arcuate ports formed on the pump running surface and third and fourth arcuate ports formed on the motor running surface, wherein the first and third arcuate ports are open to the first system port and the second and fourth arcuate ports are open to the second system port;
- and
- a first check valve located in the center section and connected to the first system port and a second check valve located in the center section and connected to the second system port, each check valve comprising a check valve body located in a check valve opening formed on an external surface of the center section, wherein at least a portion of one of the system ports is located between the pump running surface and one of the check valve openings and the entire body of at least one of the check valve bodies is located directly below the pump running surface.
2 more elements
A hydraulic drive apparatus, comprising:
- a housing forming a sump and having a center section mounted therein;
- a pump input shaft extending into the housing and drivingly engaging a rotatable pump cylinder block located on a horizontal pump running surface of the center section;
- a rotatable motor cylinder block located on a vertical motor running surface of the center section and driving a motor output shaft;
- the center section further comprising:
- first and second system ports located in the center section, wherein at least a portion of the system ports is located below the pump running surface;
- first and second arcuate ports formed on the pump running surface and third and fourth arcuate ports formed on the motor running surface, wherein the first and third arcuate ports are open to the first system port and the second and fourth arcuate ports are open to the second system port;
- and
- a first check valve located in the center section and connected to the first system port and a second check valve located in the center section and connected to the second system port, each check valve comprising a check valve body located in a check valve opening formed on an external surface of the center section, wherein at least a portion of one of the system ports is located above one of the check valve openings and the entire body of at least one of the check valve bodies is located directly below the pump cylinder block.
5 more elements
Dependencies are inferred from the claim text.