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A pump system includes a housing, an input shaft, a pump shaft; a hydraulic pump body, a PTO shaft, a power transmission gear train, and a PTO clutch mechanism. The housing has a narrow gear accommodating space surrounding a region including a mesh point between the first and second transmission gea

A pump system includes a housing, an input shaft, a pump shaft; a hydraulic pump body, a PTO shaft, a power transmission gear train, and a PTO clutch mechanism. The housing has a narrow gear accommodating space surrounding a region including a mesh point between the first and second transmission gears of the power transmission gear train, a PTO clutch accommodating space which surrounds the PTO clutch mechanism and which is fluidly communicated with the gear accommodating space, and a pair of first and second suction/discharge ports which communicate the internal space of the housing with an outside of the housing. The first suction/discharge port is arranged within the gear accommodating space so as to be positioned in an opposite side to the PTO clutch accommodating space with the mesh point between the first and second transmission gears interposed therebetween.

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What is claimed is: 1. A pump system comprising: a housing capable of reserving oil in an internal space; an input shaft supported by the housing so as to be operatively connected to a driving source; a pump shaft supported by the housing; a hydraulic pump body which is accommodated in the housing

What is claimed is: 1. A pump system comprising: a housing capable of reserving oil in an internal space; an input shaft supported by the housing so as to be operatively connected to a driving source; a pump shaft supported by the housing; a hydraulic pump body which is accommodated in the housing and is driven by the pump shaft; a PTO shaft supported by the housing; a power transmission gear train which transmits a power from the input shaft to the pump shaft and the PTO shaft, and is accommodated in the housing; and a PTO clutch mechanism accommodated in the housing so as to be positioned in a power transmission path from the input shaft to the PTO shaft, wherein the power transmission gear train has at least two first and second transmission gears meshed with each other, the housing has a narrow gear accommodating space surrounding a region including a mesh point between the first and second transmission gears, a PTO clutch accommodating space which surrounds the FTC clutch mechanism and which is fluidly communicated with the gear accommodating space, and a pair of first and second suction/discharge ports which communicate the internal space of the housing with an outside of the housing, and the first suction/discharge port is arranged within the gear accommodating space so as to be positioned in an opposite side to the PTO clutch accommodating space with the mesh point between the first and second transmission gears interposed therebetween. 2. A pump system according to claim 1, wherein a fluid groove extending from the first suction/discharge port to the PTO clutch accommodating space via the mesh point is formed in at least one of a pair of inner surfaces of the housing, the liner surfaces defining the gear accommodating space and facing to each other with the first and second transmission gears interposed therebetween. 3. A pump system according to claim 2, wherein the fluid groove extending from the first suction/discharge port to the PTO clutch accommodating space via the mesh point is formed also in the other of the pair of inner surfaces of the housing. 4. A pump system according to claim 1, wherein the first suction/discharge port is positioned on an upstream side of the mesh point with respect to a rotational direction of the first and second transmission gears. 5. A pump system according to claim 1, wherein the second suction/discharge port is arranged within the gear accommodating space. 6. A pump system according to claim 5, wherein the first and second suction/discharge ports are provided in the vicinity of an outer peripheral edge of the first or second transmission gear, and the housing has a partition portion for preventing a direct oil flow between the first and second suction/discharge ports. 7. A pump system according to claim 5, wherein a fluid groove extending from the PTO clutch accommodating space to the second suction/discharge port is formed in at least one of a pair of inner surfaces of the housing, the inner surfaces defining the gear accommodating space and facing to each other with the first and the second transmission gears interposed therebetween. 8. A pump system according to claim 7, wherein the fluid groove extending from the PTO clutch accommodating space to the second suction/discharge port is formed also in the other of the pair of inner surfaces of the housing. 9. A pump system according to claim 7, wherein the fluid groove is formed so as to face an outer peripheral edge of any transmission gear forming the power transmission gear train, and the second suction/discharge port is positioned on a downstream side in a rotational direction of the transmission gear. 10. A pump system according to claim 1, wherein the housing includes a base housing accommodating the power transmission gear train and the PTO clutch mechanism, and a pump case which is detachably coupled to the base housing and accommodates the hydraulic pump body. 11. A pump system according to claim 10, wherein an opening fluidly communicating the internal space of the pump case with the gear accommodating space is provided in the pump case and the base housing. 12. A pump system according to claim 1, wherein the pump shaft includes first and second pump shafts, and the hydraulic pump body includes first and second hydraulic pump bodies respectively driven by the first and second pump shafts. 13. A pump system according to claim 12, wherein the first and second hydraulic pump bodies are positioned in parallel. 14. A pump system according to claim 12, wherein the first and second hydraulic pump bodies are positioned in series. 15. A pump system comprising: a base housing which has an input portion operatively connected to a driving source and which is capable of being directly or indirectly attached to a support member; a pump unit which has first and second pump shafts, first and second hydraulic pump bodies respectively driven by the first and second pump shafts, and a pump case surrounding the first and second hydraulic pump bodies, the pump case being detachably coupled to the base housing; a PTO unit having a PTO shaft and a PTO clutch mechanism accommodated in the base housing in a state of being supported by the PTO shaft; arid a power transmission gear train which transmits a power from the input portion to the first pump shaft, the second pump shaft and the PTO shaft, and which is accommodated in the base housing, wherein the power transmission gear train has first and second transmission gears meshed with each other, the base housing has a narrow gear accommodating space surrounding a region including a mesh point between the first and second transmission gears, a PTO clutch accommodating space which surrounds the PTO clutch mechanism and which is fluidly communicated with the gear accommodating space, and a pair of first and second suction/discharge ports which fluidly communicates the gear accommodating with an outside of the housing, the first suction/discharge port is positioned in an opposite side to the PTO clutch accommodating space with the mesh point between the first and second transmission gears interposed therebetween, and a first fluid groove extending from the first suction/discharge port to the PTO clutch accommodating space via the mesh point is formed in at least one of a pair of inner surfaces of the base housing, the inner surfaces defining the gear accommodating space and facing to each other with the first and second transmission gears interposed therebetween. 16. A pump system according to claim 15, wherein the first and second hydraulic pump bodies are positioned in series with the base housing interposed therebetween, and the pump case includes first and second pump cases respectively surrounding the first arid second hydraulic pump bodies. 17. A pump system according to claim 15, wherein the first and second hydraulic pump bodies are arranged positioned in parallel on the same side of the base housing. 18. A pump system according to claim 17, wherein the pump case is configured so as to surround both of the first and second hydraulic pump bodies. 19. A pump system according to claim 17, wherein the pump case includes first and second pump cases respectively surrounding the first and second hydraulic pump bodies.