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 gear
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.
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1. 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 pump disposed in the first sump;a second pump assembly engaged to the first pump assembly and comprising a second end cap, a
1. 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 pump disposed in the first sump;a second pump assembly engaged to the first pump assembly and comprising a second end cap, a second pump housing mounted to the second end cap to form a second sump, and a second pump disposed in the second sump;a gearbox forming a third sump and having a plurality of transmission gears rotatably disposed therein;an input shaft comprising a first end external to the gearbox and a second end;a hydraulic power take off mechanism comprising a drive shaft extending into the gearbox and an output shaft, wherein the drive shaft and the output shaft extend in opposite directions from one another and are parallel to the input shaft; andthe plurality of transmission gears comprising at least a first transmission gear fixed on and driven by the input shaft and a second transmission gear fixed on and driving the drive shaft;a dual stage planetary reduction system disposed on an end of the drive shaft; andan electric power take off coupled to the dual stage planetary reduction system, whereby the dual stage planetary reduction system provides motive force to the electric power take off. 2. The hydraulic pump apparatus of claim 1, further comprising a first charge pump positioned directly between and engaging both the first end cap and the second end cap. 3. The hydraulic pump apparatus of claim 2, further comprising a second charge pump disposed between the third sump and the power take off mechanism. 4. The hydraulic pump apparatus of claim 3, wherein the gearbox comprises a portion of the second pump housing joined to a separate housing member, and the second charge pump comprises a charge porting block mounted to the second pump housing and a gerotor disposed within a recess on the second pump housing. 5. The hydraulic pump apparatus of claim 4, further comprising a first fluid passage within the charge porting block connecting the second charge pump to the power take off mechanism. 6. The hydraulic pump apparatus of claim 5, further comprising a second fluid passage extending through the charge porting block and the second pump housing to connect the power take off mechanism and the third sump. 7. The hydraulic pump apparatus of claim 6, further comprising a valve within the charge porting block that controls the movement of pressurized hydraulic fluid within the first and second fluid passages, wherein the valve is moveable between a first position that simultaneously routes pressurized hydraulic fluid from the second charge pump to the power take off mechanism through the first fluid passage and prevents release of pressurized hydraulic fluid from the power take off mechanism through the second fluid passage, and a second position, wherein pressurized hydraulic fluid is blocked from the power take off mechanism and vented through the second fluid passage. 8. The hydraulic pump apparatus of claim 7, wherein the output shaft is released from a stationary position and coupled to and rotated with the drive shaft when the valve is in the first position, and the output shaft is uncoupled from and held stationary in relation to the drive shaft when the valve is in the second position. 9. The hydraulic pump apparatus of claim 2, further comprising a first hydraulic circuit formed in the first end cap and a second hydraulic circuit formed in the second end cap, whereby the first charge pump provides pressurized hydraulic fluid to both the first hydraulic circuit and the second hydraulic circuit. 10. The hydraulic pump apparatus of claim 9, further comprising an external hydraulic line that connects one of the first end cap or the second end cap to the power take off mechanism, whereby pressurized hydraulic fluid drawn from either the first or the second hydraulic circuit actuates the power take off mechanism. 11. The hydraulic pump apparatus of claim 10, wherein the gearbox comprises a portion of the second pump housing joined to a separate housing member, and wherein a relief passage extends through the portion of the second pump housing to connect the power take off mechanism and the third sump. 12. The hydraulic pump apparatus of claim 11, wherein the power take off mechanism further comprises an inlet passage connected to the external hydraulic line. 13. The hydraulic pump apparatus of claim 12, wherein the power take off mechanism further comprises a valve traversing both the inlet passage and the relief passage, whereby the valve is moveable between a first position that simultaneously opens the inlet passage and closes the relief passage to provide pressurized hydraulic fluid to the power take off mechanism, and a second position wherein the inlet passage is closed and the relief passage is open to vent pressurized hydraulic fluid from the power take off mechanism. 14. The hydraulic pump apparatus of claim 13, wherein the output shaft is released from a stationary position and coupled to and rotated with the drive shaft when the valve is in the first position, and the output shaft is uncoupled from and held stationary in relation to the drive shaft when the valve is in the second position. 15. The hydraulic pump apparatus of claim 1, wherein the first and second pumps are both axial piston pumps and the axis of rotation of the first pump is collinear to the axis of rotation of the second pump. 16. The hydraulic pump apparatus of claim 1, wherein the power take off mechanism is directly mounted on a portion of the second pump housing. 17. The hydraulic pump apparatus of claim 1, wherein the gearbox comprises a portion of the second pump housing joined to a separate housing member. 18. The hydraulic pump apparatus of claim 1, wherein the plurality of transmission gears further comprises a third transmission gear fixedly mounted on a rotatable jackshaft within the gearbox, wherein the first transmission gear engages and drives the third transmission gear which engages and drives the second transmission gear, thereby conveying power from the input shaft to the drive shaft. 19. The hydraulic pump apparatus of claim 18, wherein the outside diameter of the second transmission gear is greater than the outside diameter of the first transmission gear, thereby reducing the rotational speed of the drive shaft relative to that of the input shaft. 20. The hydraulic pump apparatus of claim 1 further comprising an electrical connector for connection to a switchable source of direct electric current/voltage and an electric clutch mechanism. 21. The hydraulic pump apparatus of claim 20 further comprising a midshaft disposed between the drive shaft and the output shaft. 22. The hydraulic pump apparatus of claim 21 wherein application of electric current/voltage to the electrical connector engages the electric clutch mechanism causing synchronization of rotations of the midshaft and the output shaft to transfer power from the midshaft to the output shaft.
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