There is provided a working vehicle including: a hydraulic pump unit including a hydraulic pump main body operatively driven by a driving power source, and a pump case accommodating the hydraulic pump main body and having an inner space capable of storing oil; a hydraulic motor unit spaced apart fro
There is provided a working vehicle including: a hydraulic pump unit including a hydraulic pump main body operatively driven by a driving power source, and a pump case accommodating the hydraulic pump main body and having an inner space capable of storing oil; a hydraulic motor unit spaced apart from the hydraulic pump unit so as to operatively drive a corresponding driving wheel, the hydraulic motor unit including a hydraulic motor main body fluidly connected to the hydraulic pump main body so as to form an HST in cooperation with the hydraulic pump main body, and a motor case accommodating the hydraulic motor main body and having an inner space capable of storing oil; an auxiliary pump unit including an auxiliary pump main body operatively driven by the driving power source; a circulation line for fluidly connecting the auxiliary pump main body, the pump case and the motor case so that at least a part of oil, which has been discharged from the auxiliary pump main body, returns to a suction side of the auxiliary pump main body through the inner spaces of the pump case and the motor case; and an oil cooler interposed in the circulation line so as to be positioned. between the auxiliary pump main body and the pump case or the motor case.
대표청구항▼
What is claimed is: 1. A working vehicle comprising: a hydraulic pump unit including a hydraulic pump main body operatively driven by a driving power source, and a pump case accommodating the hydraulic pump main body and having an inner space capable of storing oil; a hydraulic motor unit spaced ap
What is claimed is: 1. A working vehicle comprising: a hydraulic pump unit including a hydraulic pump main body operatively driven by a driving power source, and a pump case accommodating the hydraulic pump main body and having an inner space capable of storing oil; a hydraulic motor unit spaced apart from the hydraulic pump unit so as to operatively drive a corresponding driving wheel, the hydraulic motor unit including a hydraulic motor main body fluidly connected to the hydraulic pump main body so as to form an HST in cooperation with the hydraulic pump main body, and a motor case accommodating the hydraulic motor main body and having an inner space capable of storing oil; an auxiliary pump unit including an auxiliary pump main body operatively driven by the driving power source; a circulation line for fluidly connecting the auxiliary pump main body, the pump case and the motor case so that at least a part of oil, which has been discharged from the auxiliary pump main body, returns to a suction side of the auxiliary pump main body through the inner spaces of the pump case and the motor case; and an oil cooler interposed in the circulation line so as to be positioned between the auxiliary pump main body and the pump case or the motor case. 2. A working vehicle according to claim 1, further comprising: an external reservoir tank forming an oil source for the auxiliary pump unit, wherein the circulation line includes a suction line for fluidly connecting the external reservoir tank and the suction side of the auxiliary pump main body, a discharge line for fluidly connecting a discharge side of the auxiliary pump main body and the oil cooler, and a return line for returning the oil, which has been cooled by the oil cooler, to the external reservoir tank through the inner spaces of the pump case and the motor case. 3. A working vehicle according to claim 2, wherein the return line fluidly connect the pump case and the motor case in series. 4. A working vehicle according to claim 2, wherein the return line fluidly connect the pump case and the motor case in parallel. 5. A working vehicle according to claim 1, further comprising: a bypass line having one end fluidly connected to the circulation line, and a bypass valve for selectively communicating or shutting off the bypass line. 6. A working vehicle according to claim 5, wherein the bypass valve is a relief valve for setting a maximum pressure of the circulation line. 7. A working vehicle comprising: a hydraulic pump unit including first and second hydraulic pump main bodies operatively driven by a driving power source, and a pump housing accommodating the first and second hydraulic pump main bodies and having an inner space capable of storing oil; a first hydraulic motor unit spaced apart from the hydraulic pump unit so as to operatively drive a first driving wheel out of a pair of first and second driving wheels, the first hydraulic motor unit including a first hydraulic motor main body fluidly connected to the first hydraulic pump main body so as to form an HST in cooperation with the first hydraulic pump main body, and a first motor case accommodating the first hydraulic motor main body and having an inner space capable of storing oil; a second hydraulic motor unit spaced apart from the hydraulic pump unit so as to operatively drive the second driving wheel, the second hydraulic motor unit including a second hydraulic motor main body fluidly connected to the second hydraulic pump main body so as to form an HST in cooperation with the second hydraulic pump main body, and a second motor case accommodating the second hydraulic motor main body and having an inner space capable of storing oil; an auxiliary pump unit including an auxiliary pump main body operatively driven by the driving power source; an external reservoir tank forming an oil source for the auxiliary pump unit; a circulation line for fluidly connecting the external reservoir tank, the auxiliary pump main body, the pump housing and the motor case so that at least a part of oil, which has been suctioned by and discharged from the auxiliary pump main body, returns to the external reservoir tank through the inner spaces of the pump housing and the motor case; and an oil cooler interposed in the circulation line so as to be positioned between the auxiliary pump main body and the pump housing or the motor case. 8. A working vehicle according to claim 7, wherein the pump housing includes a base housing having a single input portion operatively connected to the driving power source, output portions capable of outputting the rotational power of the input portion towards the first and second hydraulic motor main bodies, and an inner space capable of storing oil; and a pump case connected to the base housing, the pump case accommodating the first and second hydraulic pump main bodies and having an inner space of storing oil; the base housing and the pump case are configured to be fluidly communicated to each other; the pump case is provided with an oil-introducing port for receiving the oil directly or indirectly supplied from the auxiliary pump main body; and the base housing is provided with an oil-discharging port for discharging the stored oil. 9. A working vehicle according to claim 8, wherein the pump case includes first and second pump cases accommodating the first and second hydraulic pump main bodies, respectively. 10. A working vehicle according to claim 8, further comprising: a PTO clutch mechanism accommodated within the base housing in a state of being operatively connected to the driving power source; and a PTO shaft operatively connected to a driven side of the PTO clutch mechanism and supported by the base housing so as to have a first end extending outward. 11. A working vehicle according to claim 10, wherein the oil-discharging port is arranged so as to overlap at least one part of the PTO clutch mechanism in front view, in a state where the base housing is mounted. 12. A working vehicle according to claim 10, wherein the oil-discharging port is arranged below the PTO shaft, in a state where the base housing is mounted. 13. A working vehicle comprising: a hydraulic pump unit including a hydraulic pump main body operatively driven by a driving power source, and a pump case accommodating the hydraulic pump main body and having an inner space capable of storing oil; a hydraulic motor unit spaced apart from the hydraulic pump unit so as to operatively drive a corresponding driving wheel, the hydraulic motor unit including a hydraulic motor main body fluidly connected to the hydraulic pump main body so as to form an HST in cooperation with the hydraulic pump main body, and a motor case accommodating the hydraulic motor main body and having an inner space capable of storing oil; an auxiliary pump unit including an auxiliary pump main body operatively driven by the driving power source; a circulation line for fluidly connecting the auxiliary pump main body and the motor case so that at least a part of oil, which has been discharged from the auxiliary pump main body, returns to a suction side of the auxiliary pump main body through the inner space of the pump case; and an oil cooler interposed in the circulation line so as to be positioned between the auxiliary pump main body and the motor case. 14. A working vehicle comprising: a hydraulic pump unit including a hydraulic pump main body operatively driven by a driving power source, and a pump housing that has a pump case accommodating the hydraulic pump main body and a base housing connected to the pump case, the base housing accommodating a PTO clutch mechanism, which is operatively driven by the driving source, within an inner space capable of storing oil, and supporting a PTO shaft, which is operatively connected to a driven side of the PTO clutch mechanism, so as to have a first end extending outward; a hydraulic motor unit spaced apart from the hydraulic pump unit so as to operatively drive a corresponding driving wheel, the hydraulic motor unit including a hydraulic motor main body fluidly connected to the hydraulic pump main body so as to form an HST in cooperation with the hydraulic pump main body, and a motor case accommodating the hydraulic motor main body and having an inner space capable of storing oil; an auxiliary pump unit including an auxiliary pump main body operatively driven by the driving power source; a circulation line for fluidly connecting the auxiliary pump main body, the base housing and the motor case so that at least a part of oil, which has been discharged from the auxiliary pump main body, returns to a suction side of the auxiliary pump main body through the inner spaces of the base housing and the motor case; and an oil cooler interposed in the circulation line so as to be positioned between the auxiliary pump main body and the base housing or the motor case. 15. A working vehicle comprising: a hydraulic pump unit including a hydraulic pump main body operatively driven by a driving power source, and a pump housing accommodating the hydraulic pump main body and having an inner space capable of storing oil; a first hydraulic motor unit spaced apart from the hydraulic pump unit and disposed at one side of the vehicle fore-and-aft direction so as to operatively drive a corresponding driving wheel, the first hydraulic motor unit including at least a first hydraulic motor main body fluidly connected to the hydraulic pump main body so as to form an HST in cooperation with the hydraulic pump main body, and at least a first motor case accommodating the first hydraulic motor main body and having an inner space capable of storing oil; a second hydraulic motor unit spaced apart from the hydraulic pump unit and disposed at the other side of the vehicle fore-and-aft direction so as to operatively drive a corresponding driving wheel, the second hydraulic motor unit including at least a second hydraulic motor main body fluidly connected to the hydraulic pump main body so as to form an HST in cooperation with the hydraulic pump main body, and at least a second motor case accommodating the second hydraulic motor main body and having an inner space capable of storing oil; an auxiliary pump unit including an auxiliary pump main body operatively driven by the driving power source; a circulation line for fluidly connecting the auxiliary pump main body, the pump case and the first and second motor cases so that at least a part of oil, which has been discharged from the auxiliary pump main body, returns to a suction side of the auxiliary pump main body through the inner spaces of the pump case and the first and second motor cases; and an oil cooler interposed in the circulation line so as to be positioned at a discharge side of the auxiliary pump main body.
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이 특허에 인용된 특허 (6)
Heinrich Duckinghaus DE, Apparatus and method for improving the efficiency of a hydraulic fluid cooler in a self-propelled agricultural machine.
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