A dual pump apparatus for use on a vehicle or industrial application having a housing in which a pair of hydraulic pumps are mounted and driven by a prime mover. The prime mover is drivingly coupled to a main input shaft, which drives the hydraulic pumps. An auxiliary pump may be drivingly coupled t
A dual pump apparatus for use on a vehicle or industrial application having a housing in which a pair of hydraulic pumps are mounted and driven by a prime mover. The prime mover is drivingly coupled to a main input shaft, which drives the hydraulic pumps. An auxiliary pump may be drivingly coupled to the main drive shaft and a power take off unit may also be connected thereto. The power take off unit may be driven by a power take off unit output drive shaft, on which a cooling fan may be attached.
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The invention claimed is: 1. A hydraulic pump unit for mounting on a frame of a vehicle, the pump unit comprising: an end cap having a first side, a second side and porting formed within the end cap; a pump housing attached to the first side of the end cap, the pump housing including a pump chamber
The invention claimed is: 1. A hydraulic pump unit for mounting on a frame of a vehicle, the pump unit comprising: an end cap having a first side, a second side and porting formed within the end cap; a pump housing attached to the first side of the end cap, the pump housing including a pump chamber formed therein; a gear chamber cover attached to the second side of the end cap and forming a gear chamber therein; first and second hydraulic pumps rotatably mounted in the pump chamber, the hydraulic pumps being mounted on the first side of the end cap and driven by respective pump shafts; an auxiliary pump mounted to the first side of the end cap, and in fluid communication with the first and second hydraulic pumps, and being driven by an auxiliary shaft; a gear set mounted in the gear chamber and drivingly engaged to each of the pump shafts and the auxiliary shaft; and a main drive shaft drivingly engaged to the gear set, where the pump shafts and auxiliary shaft are driven by the main drive shaft and where the main drive shaft has a first end extending from the pump housing and directly coupled to a prime mover. 2. A hydraulic pump unit as set forth in claim 1, further comprising a power take off unit having an output shaft, the power take off unit being mounted to the gear chamber cover and the output shaft being drivingly and removably coupled to the main drive shaft. 3. A hydraulic pump unit as set forth in claim 2, wherein one of the pumps provides control pressure for the power take off unit. 4. A hydraulic pump unit as set forth in claim 2, wherein the auxiliary pump provides control pressure for the power take off unit. 5. A hydraulic pump unit as set forth in claim 2, further comprising a clutch for engaging and disengaging the output shaft to the main drive shaft. 6. A hydraulic pump unit as set forth in claim 2, further comprising a fan mounted on the output shaft. 7. A pump apparatus, the pump apparatus comprising: a main input shaft engaged to and driving a drive mechanism; a first pump having a first pump shaft driven by the drive mechanism; a second pump having a second pump shaft driven by the drive mechanism; an auxiliary pump having an auxiliary pump shaft driven by the mechanism; and a common end cap defining porting and supporting the first pump, the second pump and the auxiliary pump; wherein the auxiliary pump, first pump and second pump are disposed on a first side of the end cap and the auxiliary pump is in fluid communication with the first and second pumps, and the drive mechanism is located on a second side of the end cap opposite to the first side. 8. A pump apparatus as set forth in claim 7, wherein the pump apparatus is attached to a prime mover having a prime mover output, where the prime mover output and the main input shaft are coaxial. 9. A pump apparatus as set forth in claim 8, wherein the pump apparatus is attached to the prime mover by a bell housing. 10. A pump apparatus as set forth in claim 9, wherein the prime mover is connected to the main input shaft within the bell housing. 11. A pump apparatus as set forth in claim 8, wherein the prime mover output is a flywheel and the main input shaft is coupled to the flywheel. 12. A pump apparatus as set forth in claim 7, further comprising a pair of trunnion arms extending from opposite ends of the pump apparatus, where each trunnion arm is engaged to a swash plate located within the pump apparatus. 13. A pump apparatus as set forth in claim 7, further comprising a power take off unit with an output shaft and a clutch for engaging the output shaft to the main input shaft. 14. A pump apparatus as set forth in claim 13, wherein the output shaft and the main input shaft are coaxial. 15. A pump apparatus as set forth in claim 13, further comprising a fan mounted on the output shaft. 16. A pump apparatus as set forth in claim 7, wherein the first pump shaft and the second pump shaft are generally parallel to the main input shaft. 17. A pump apparatus attached to a prime mover, comprising: a hydraulic mounting member having a first side and a second side opposite the first side; a main input shaft having a first end connected to a prime mover output and a second end; a first pump shaft driving a first pump; a second pump shaft driving a second pump, the first pump shaft and the second pump shaft being drivingly coupled to and symmetrically located on opposite sides of the main input shaft; the first and second pumps being rotatable disposed on the first side of the hydraulic mounting member; an auxiliary pump shaft driving an auxiliary pump, the auxiliary pump shaft being drivingly coupled to the main input shaft and the auxiliary pump being in fluid communication with the first and second pumps; and a power take off unit having a power take off shaft that is coaxial with the main input shaft, the power take off unit located on the second side of the hydraulic mounting member. 18. A pump apparatus as set forth in claim 17, further comprising a first trunnion arm to control the displacement of the first pump and a second trunnion arm to control the displacement of the second pump, wherein the first trunnion arm and the second trunnion arm each extend from opposite sides of the pump apparatus. 19. A pump apparatus as set forth in claim 18, wherein the hydraulic mounting member comprises a common end cap. 20. A pump apparatus as set forth in claim 19, wherein the auxiliary pump is supported on the first side of the common end cap. 21. A pump apparatus unit as set forth in claim 17, further comprising a separate housing member disposed between the hydraulic mounting member and the power take off unit, wherein the power take off unit is mounted to the separate housing member. 22. A pump apparatus unit as set forth in claim 21, further comprising a set of gears disposed within the separate housing member and powered by the second end of the input shaft and providing motive force to the first and second pumps and the auxiliary pump. 23. A hydraulic pump unit for mounting on a frame of a vehicle having a prime mover, the pump unit comprising: a pump housing having a first end, a second end and a plurality of sides, and a pump chamber formed therein; an end cap mounted on the second end of the pump housing; a gear chamber cover attached to the end cap and forming a gear chamber therein; first and second hydraulic pumps rotatably mounted in the pump chamber and driven by respective pump shafts; an auxiliary pump mounted on the end cap and driven by an auxiliary shaft; a gear set mounted in the gear chamber and drivingly engaged to each of the pump shafts and the auxiliary shaft; a main drive shaft drivingly engaged to the gear set, whereby the pump shafts and auxiliary shaft are driven by the main drive shaft, the main drive shaft having a first end extending from the first end of the pump housing and being directly coupled to the prime mover, and a second end extending from the gear chamber cover; and a power take off unit mounted to the gear chamber cover and including an output shaft, the power take off unit being drivingly coupled to the main drive shaft and the output shaft being coaxial with the main drive shaft. 24. A hydraulic pump unit as set forth in claim 23, wherein one of the pumps provides control pressure for the power take off unit. 25. A hydraulic pump unit as set forth in claim 23, wherein the auxiliary pump provides control pressure for the power take off unit. 26. A hydraulic pump unit as set forth in claim 23, further comprising a clutch for engaging and disengaging the output shaft of the power take off unit to the main drive shaft. 27. A hydraulic pump unit as set forth in claim 23, further comprising a fan mounted on an end of the output shaft.
Okada Takahiko (Chiryu JPX) Fujiwara Hidetoshi (Aichi JPX) Katafuchi Norihisa (Okazaki JPX), Tandem rotary pump with pressure chamber between two intermediate side plates.
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