Pump
AssigneeHydro-Gear Limited Partnership
InventorRobert Trimble
Life of this patent
Estimating the term…
Abstract
A symmetric pump having a symmetric end cap attached to a symmetric housing is disclosed. The end cap is attachable in a first position or a second position wherein the second position is rotated relative to the housing. A trunnion arm extends in a first direction and a system port opens in a first orientation when the housing is connected to the end cap in a first position. The end cap includes structure such that the housing may be connected in a second position so that the trunnion arm extends in a second direction while maintaining the system port opening in the first orientation. The end cap may be provided with a symmetric porting system. A control device for affecting movement of the swashplate is disclosed. Methods of locking the swashplate into a predetermined position are also taught.
Claims20
A direct displacement pump comprising:
- a housing;
- a swashplate supported in the housing;
- an end cap having system ports attached to the housing;
- a charge pump connected to the end cap;
- an arm extending from the housing and positioned to act upon the swashplate, whereby the pump is controlled with direct displacement of the arm;
- and the pump further comprising
- a pump shaft rotatably supported in housing, wherein the pump shaft is a through-shaft passing through the end cap and the charge pump to extend from the charge pump.
A hydrostatic pump comprising:
- an end cap having system porting;
- and
- an auxiliary charge gerotor in fluid communication with the system porting, whereby pressurized fluid may be supplied to predetermined locations.
A hydrostaticly powered vehicle comprising:
- a vehicle frame having first and second sides;
- a first wheel mounted on the frame first side and a second wheel, opposite the first wheel, mounted on the frame second side;
- first and second motors respectively connected to the first and second wheels;
- a first hydrostatic pump fluidly connected to the first motor via a pair of system ports and comprising a trunnion arm extending toward the first side and a case drain opening toward the second side;
- and
- a second hydrostatic pump fluidly connected to the second motor via a pair of system ports and comprising a trunnion arm extending toward the second side and a case drain opening toward the second side.
A hydrostatic powered vehicle comprising:
- a vehicle frame;
- a first pump connected to the frame and comprising:
- a housing having a trunnion arm extending in a first direction and
- an end cap connected to the housing and comprising a pair of system ports opening in a second direction and a case drain opening in a third direction;
- and
- the vehicle further comprising a second pump connected to the frame and comprising:
- a housing having a trunnion arm extending in a direction opposite the first direction;
- and
- an end cap connected to the housing and comprising a pair of system ports opening in the second direction and a case drain opening in a direction opposite the third direction.
A hydrostatic powered vehicle comprising:
- a vehicle frame;
- first and second wheels respectively connected to first and second motors;
- and
- first and second hydrostatic pumps respectively fluidly connected to the first and second motors, wherein:
- the first hydrostatic pump comprises:
- a housing having a control arm extending in a first direction;
- and
- an end cap connected to the housing and having a pair of case drains opening parallel with the first direction and opposite each other, wherein a user selected one of the pair of case drains is plugged;
- the second hydrostatic pump comprises:
- a housing having a control arm extruding in a second direction, and
- an end cap connected to the housing and having a pair of case drains opening parallel with the second direction and opposite each, wherein a user selected one of the pair of case drains is plugged;
- and
- whereby a fluid hose layout optimal for the vehicle may be selected by the user.
A hydrostatic powered vehicle comprising:
- a vehicle frame;
- a hydrostatic pump housing having a trunnion arm extending therefrom, wherein the housing is mounted such that the trunnion arm extends in a first user selected direction;
- and
- an end cap connected to the housing and having a pair of case drains opening in opposite directions, wherein one of the case drains is plugged such that the end cap drains in a second user selected direction, whereby the user may reduce component connect complexity.
A hydrostatic powered vehicle comprising a vehicle frame and first and second hydrostatic pumps connected to the frame in first and second user selected orientations, wherein the first pump comprises:
- a housing having a trunnion arm and being mounted such that the trunnion arm extends in a first user selected direction;
- and
- an end cap connected to the housing and having a pair of case drains opening parallel to the first user selected direction, wherein a user selected one of the case drains is plugged;
- and wherein
- the second pump comprises:
- a housing having a trunnion arm and being mounted such that the trunnion arm extends in a second user selected direction;
- and
- an end cap connected to the housing and having a pair of case drains opening parallel to the second user selected direction, wherein a user selected one of the case drains is plugged, whereby the hydraulic hose and pump control layouts may be user selected and optimized for minimum complexity.
Dependencies are inferred from the claim text.