Dual pump apparatus with power take off
AssigneeHydro-Gear Limited Partnership
InventorsRaymond Hauser, Michael L. Bennett
Life of this patent
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Abstract
A drive apparatus includes a pair of axial piston pump assemblies in an inline relationship, each pump assembly having an end cap mounted to a pump housing to form a sump. The pump assemblies are mounted to a gearbox at one end thereof, and an input shaft extends into both pump housings and the gearbox to drive the axial piston pumps and one of the gears. A power take off mechanism is also engaged to the gearbox at another end thereof and includes a drive shaft at least partially disposed in the gearbox and driven by one of the transmission gears, and an output shaft extending in the opposite direction from the drive shaft.
Claims44
A hydraulic pump apparatus, comprising:
- a first pump assembly comprising a first end cap, a first pump housing mounted to the first end cap to form a first sump and a first axial piston pump disposed in the first sump;
- a second pump assembly comprising a second end cap, a second pump housing mounted to the second end cap to form a second sump, and a second axial piston pump disposed in the second sump, wherein the axes of rotation of the first and second axial piston pumps are collinear;
- a charge pump positioned directly between and engaging both the first and second end caps;
- a gearbox comprising a gearbox housing forming a third sump and a plurality of transmission gears rotatably disposed therein;
- an input shaft comprising a first end external to the gearbox housing and a second end;
- a first transmission gear fixed on and driven by the input shaft;
- and
- a power take off mechanism comprising a drive shaft extending into the gearbox to engage and be driven by a second transmission gear fixed on the drive shaft and an output shaft, wherein the drive shaft and output shaft extend in opposite directions from one another and are parallel to the input shaft.
A hydraulic pump apparatus, comprising:
- first and second pump assemblies, each pump assembly comprising an end cap, a pump housing mounted to the end cap to form a sump, and an axial piston pump disposed in the sump;
- a gearbox having a plurality of transmission gears rotatably disposed therein;
- a single input shaft extending into both pump housings and the gearbox to simultaneously drive both axial piston pumps and one of the transmission gears;
- a drive shaft having a portion disposed in the gearbox and driven by another of the transmission gears, the drive shaft extending into a power take off housing;
- and
- a power takeoff mechanism disposed in the power take off housing and comprising an output shaft extending in the opposite direction from the drive shaft.
A hydraulic pump apparatus, comprising:
- a first pump assembly comprising a first end cap having first and second opposite surfaces, a first axial piston pump disposed on the first surface, and a first housing mounted to the first surface to form a first sump;
- a second pump assembly comprising a second end cap having third and fourth opposite surfaces, a second axial piston pump disposed on the third surface, and a second housing mounted to the third surface to form a second sump;
- a charge pump positioned directly between and engaging both the second and fourth surfaces;
- and
- an input shaft comprising a first end external to the first housing, a second end external to the second housing and a plurality of internal portions that engage and simultaneously drive the first axial piston pump, the charge pump and the second axial piston pump.
A power delivery apparatus, comprising:
- a gearbox having a plurality of transmission gears rotatably disposed therein;
- a hydraulic pump unit mounted to a first side of the gearbox at a first end thereof, wherein the hydraulic pump unit comprises a pair of hydraulic pump assemblies mounted in an inline relationship;
- a pump input shaft driving both pump assemblies and at least one of the transmission gears disposed in the gearbox;
- and
- a power take off mechanism disposed on the first side of the gearbox at a second end thereof, the power take off mechanism comprising a drive shaft extending parallel to the input shaft, and engaged to and driven by a second of the transmission gears disposed in the gearbox.
Dependencies are inferred from the claim text.