A pump unit for supply and discharge of hydraulic fluid into and from an actuator upon receiving driving power from a driving source is provided, in which said actuator is fluidly connected to said pump unit via a hydraulic circuit. The pump unit includes an input member operatively connected to the
A pump unit for supply and discharge of hydraulic fluid into and from an actuator upon receiving driving power from a driving source is provided, in which said actuator is fluidly connected to said pump unit via a hydraulic circuit. The pump unit includes an input member operatively connected to the driving source, a first hydraulic pump body operatively connected to the input member, a pump case for accommodating the first hydraulic pump body and forming a hydraulic fluid sump, and a PTO unit accommodated within the pump case. The PTO unit includes a PTO shaft supported by the pump case so as to have an end extending outward from the pump case, and a clutch mechanism for selectively enabling and disabling transmission of driving power from the input member to the PTO shaft.
대표청구항▼
What is claimed is: 1. A working vehicle comprising: a vehicle frame; a first pair of laterally disposed wheels supported by said vehicle frame; a second pair of laterally disposed wheels supported by said vehicle frame so as to be located away from said first pair of laterally disposed wheels in a
What is claimed is: 1. A working vehicle comprising: a vehicle frame; a first pair of laterally disposed wheels supported by said vehicle frame; a second pair of laterally disposed wheels supported by said vehicle frame so as to be located away from said first pair of laterally disposed wheels in a fore and aft direction of said working vehicle; a working unit supported by said vehicle frame; a driving source supported by said vehicle frame; first and second motor units respectively and operatively connected to said first pair of laterally disposed wheels; and a pump unit supported directly or indirectly byialld vehicle frame so as to be operatively connected to said driving source, said pump unit arranged to supply and discharge hydraulic fluid into and from each of said first and second motor units, and take out driving power of said driving source and output the same as driving power for said working unit, said pump unit comprising: an input member operatively connected to said driving source; a first hydraulic pump body operatively connected to said input member; a pump case for accommodating said first hydraulic pump body; fluid connection ports disposed on an outside surface of said pump case for fluidly connecting said first hydraulic pump body with said first and second motor units; and a PTO unit accommodated within said pump case, said PTO unit comprising: a PTO shaft supported by said pump case so as to have an end extending outward from said pump case; and a clutch mechanism for selectively enabling and disabling transmission of driving power from said input member to said PTO shaft, wherein said first and second motor units are accommodated outside said pump case so as to be located away from said pump unit. 2. A working vehicle according to claim 1, further comprising a charge pump unit that is operatively connected to said input member. 3. A working vehicle according to claim 1, wherein said pump unit further comprises a second hydraulic pump body operatively connected to said input member, and said fluid connection ports include first fluid connection ports that are for said first hydraulic pump body to fluidly connect with said first motor unit and second fluid connection ports that are for said second hydraulic pump body to fluidly connect with said second motor units, said first and second fluid connection ports being arranged on the outside surface of said pump case. 4. A working vehicle according to claim 1, wherein said PTO unit further comprises a brake mechanism for releasing and applying braking force away from and to said PTO shaft in association with the operation of the clutch mechanism to enable and disable the transmission of driving power from said input member to said PTO shaft. 5. A working vehicle according to claim 1, wherein said driving source is supported on said vehicle frame so as to be capable of vibrating with respect to said vehicle frame; and said driving source is operatively connected to said input member via vibration-absorbing transmission means. 6. A working vehicle according to claim 1, wherein said driving source is supported on said vehicle frame so as to be capable of vibrating with respect to said vehicle frame; and said pump unit is integrally connected to said driving source in a free state relative to the vehicle frame. 7. A working vehicle according to claim 1, wherein said pump unit further comprises an input shaft acting as said input member; and a first pump shaft operatively connected to said input shaft and arranged to drive said first hydraulic pump body. 8. A working vehicle according to claim 7, wherein said PTO shaft is arranged coaxially with said input shaft. 9. A working vehicle according to claim 7, wherein said PTO shaft has an axis, which is located at the same position as an axis of said input shaft in a vehicle width direction, and is arranged substantially orthogonal to said axis of said input shaft. 10. A working vehicle according to claim 1, wherein said pump unit further comprises a first pump shaft that acts as said input member and is arranged to drive said first hydraulic pump body. 11. A working vehicle according to claim 10, wherein said first pump shaft is arranged substantially parallel to said PTO shaft. 12. A working vehicle according to claim 10, wherein said first pump shaft is arranged substantially orthogonal to said PTO shaft. 13. A working vehicle according to claim 1, wherein said pump case has a first end wall with a first opening through which said first hydraulic pump body can pass, a second end wall with a second opening through which said clutch mechanism can pass, said second end wall being disposed away from said first end wall along an axial direction of said input member, and a partition wall extending said first end wall and said second end wall, said pump unit further comprising a center section connected to said first end wall so as to close said first opening and define a hydraulic-pump-body-accommodation space for accommodating said first hydraulic pump body in cooperation with said second end wall and said partition wall, said center section supporting said first hydraulic pump body on one of opposite sides thereof and forming said hydraulic circuit, and a lid member connected to said second end wall so as to close said second opening and define a hydraulic-clutch-mechanism-accommodation space for accommodating said clutch mechanism in cooperation with said first end wall and said partition wall.
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이 특허에 인용된 특허 (14)
Conrad Walter W. (1751 Iris Ave. Torrance CA 90503) Hebert ; Jr. James G. (12523 Inglewood Ave. ; Apt. 14 Hawthorne CA 90250), Battery operated hydraulic vehicle.
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