Abstract: A hydraulic drive vehicle includes a bypass valve for fluidly connecting or disconnecting a pump/second-motor line and a second-motor/first-motor line, and set a capacity of a first hydraulic motor to a standard capacity which makes a peripheral speed of a first wheel driven by the first hydraulic motor equal to a peripheral speed of a second wheel driven by a second hydraulic motor when the bypass valve fluidly disconnects the two lines and set the capacity of the first hydraulic motor to a first capacity smaller than the standard capacity when the bypass valve fluidly connects the two lines. The present invention makes it possible to widen a variable range in which a traveling speed of the vehicle could be changed.

Abstract: There is provided a working vehicle having first and second hydraulic pump units operatively driven by a driving source and arranged away to each other in a width direction of the vehicle. In the working vehicle, each of the first and second hydraulic pump units includes a pump body; a port block formed with an oil passage for supplying/discharging an operating fluid to/from said pump body; a pump case connected to the port block so as to define a pump body accommodating space for surrounding the pump body; and a pump shaft for rotatably driving the pump body, the pump shaft having an input end operatively connected to said driving source. A drain port for opening the pump body accommodating space outward and a charge suction port for drawing in an oil from an oil tank in order to supply a charge oil to a hydraulic circuit fluidly connecting with the corresponding hydraulic motor unit are provided respectively in first and second assemblies formed by the corresponding pump case and port block.

Abstract: There is provided a pump unit configured to be capable of transmitting a rotational per from a driving power source which is operatively connected thereto to an actuator through a pair of hydraulic fluid lines. The pump unit includes: an input shaft; a hydraulic pump main body; a PTO shaft; a PTO clutch mechanism; and auxiliary pump main body; a suction line; a discharge line; a charge line; a PTO hydraulic fluid line; a pressure-reducing valve; and a resistance valve. The PTO hydraulic fluid line and the charge line are fluidly connected to the primary side and a secondary side of the pressure-reducing valve, respectively.

Abstract: There is provided a working vehicle having first and second hydraulic pump units operatively driven by a driving source and arranged away to each other in a width direction of the vehicle. In the working vehicle, each of the first and second hydraulic pump units includes a pump body; a port block formed with an oil passage for supplying/discharging an operating fluid to/from said pump body; a pump case connected to the port block so as to define a pump body accommodating space for surrounding the pump body; and a pump shaft for rotatably driving the pump body, the pump shaft having an input end operatively connected to said driving source. A drain port for opening the pump body accommodating space outward and a charge suction port for drawing in an oil from an oil tank in order to supply a charge oil to a hydraulic circuit fluidly connecting with the corresponding hydraulic motor unit are provided respectively in first and second assemblies formed by the corresponding pump case and port block.

Abstract: There is provided a pump unit configured to be capable of transmitting a rotational per from a driving power source which is operatively connected thereto to an actuator through a pair of hydraulic fluid lines. The pump unit includes: an input shaft; a hydraulic pump main body; a PTO shaft; a PTO clutch mechanism; and auxiliary pump main body; a suction line; a discharge line; a charge line; a PTO hydraulic fluid line; a pressure-reducing valve; and a resistance valve. The PTO hydraulic fluid line and the charge line are fluidly connected to the primary side and a secondary side of the pressure-reducing valve, respectively.

Abstract: A hydraulic drive vehicle includes a bypass valve for fluidly connecting or disconnecting a pump/second-motor line and a second-motor/first-motor line, and set a capacity of a first hydraulic motor to a standard capacity which makes a peripheral speed of a first wheel driven by the first hydraulic motor equal to a peripheral speed of a second wheel driven by a second hydraulic motor when the bypass valve fluidly disconnects the two lines and set the capacity of the first hydraulic motor to a first capacity smaller than the standard capacity when the bypass valve fluidly connects the two lines. The present invention makes it possible to widen a variable range in which a traveling speed of the vehicle could be changed.

Abstract: A hydraulic four-wheel-drive working vehicle includes a hydraulic pump unit having a hydraulic pump main body of a variable displacement type, a pair of left and right first motor devices driving a left and right first driving wheels, and a pair of left and right second motor devices driving a left and right second driving wheels, wherein each of the pair of first motor devices and the pair of second motor devices includes a hydraulic motor main body forming an HST in cooperation with the hydraulic pump main body, a motor volume adjusting mechanism, and a hydraulic actuating mechanism that operates the motor volume adjusting mechanism, and the hydraulic actuating mechanisms in the pair of first motor devices and the pair of second motor devices are operated and controlled with use of hydraulic fluid from a single hydraulic pressure source.

Abstract: There is provided a pump unit including a plurality of hydraulic pump bodies disposed in parallel to each other, a plurality of pump shafts respectively supporting the plurality of hydraulic pump bodies in a relatively non-rotatable manner and a pump housing accommodating the plurality of pump bodies and supporting the plurality of pump shafts in a rotatable manner around respective axis lines, wherein each of the plurality of pump shafts has at least one end extending outward from the pump housing so as to form an input end.

Abstract: There is provided a pump unit configured to be capable of transmitting a rotational per from a driving power source which is operatively connected thereto to an actuator through a pair of hydraulic fluid lines. The pump unit includes: an input shaft; a hydraulic pump main body; a PTO shaft; a PTO clutch mechanism; and auxiliary pump main body; a suction line; a discharge line; a charge line; a PTO hydraulic fluid line; a pressure-reducing valve; and a resistance valve. The PTO hydraulic fluid line and the charge line are fluidly connected to the primary side and a secondary side of the pressure-reducing valve, respectively.

Abstract: A hydraulic wheel-drive working vehicle according to the present invention makes it possible to change a driving state by a driving-mode switching valve between a right-left differential-lock driving state in which a pair of driving wheels are driven in an independent manner to each other with hydraulic fluid discharged from a hydraulic pump and having respective amounts defined by a flow dividing/combining mechanism and a right-left differential driving state in which the pair of left and right driving wheels are driven in a hydraulically differential manner to each other, and also to supply the hydraulic fluid from the hydraulic pump to the pair of hydraulic motors without being subjected to fluid load of the flow dividing/combining mechanism at the right-left differential driving state, thereby enhancing transmission efficiency at the right-left differential driving state.

Abstract: There is provided a pump unit configured to be capable of transmitting a rotational power from a driving power source which is operatively connected thereto to an actuator through a pair of hydraulic fluid lines. The pump unit includes: an input shaft; a hydraulic pump main body; a PTO shaft; a PTO clutch mechanism; an auxiliary pump main body; a suction line; a discharge line; a charge line; a PTO hydraulic fluid line; a pressure-reducing valve; and a resistance valve. The PTO hydraulic fluid line and the charge line are fluidly connected to the primary side and a secondary side of the pressure-reducing valve, respectively.

Abstract: A charge relief mechanism for setting an oil pressure of a charge line which replenishes operating oil to a pair of operating oil lines fluidly connecting a hydraulic pump body and a hydraulic actuator, includes: an oil pressure setting line; and a charge relief valve inserted in the oil pressure setting line. The charge relief valve includes a relief valve body provided with a large diameter hole, a small diameter hole, and a check valve seat formed between the large diameter hole and the small diameter hole. The large diameter hole is provided with a check valve body which is seatable on the check valve seat and is movable in the axis line direction, and a slip-out prevention member for preventing the check valve body from being separated from the large diameter hole while allowing the check valve body to selectively communicate or block between the large diameter hole and the small diameter hole.

Abstract: There is provided a pump system including; a plurality of hydraulic pump bodies arranged in parallel; a plurality of pump shafts respectively driving the plurality of hydraulic pump bodies; a power transmission mechanism operatively connecting the plurality of pump shafts; and a pump case which accommodating the plurality of hydraulic pump bodies and the power transmission mechanism, and supports the plurality of pump shafts in a rotatable manner about an axis line, the pump case including a port block formed with supply/discharge oil passages for the plurality of pump bodies. One pump shaft of the plurality of pump shafts has a first end extending outward from the pump case so as to form an input end operatively connected to a driving source. The one pump shaft is directly or indirectly supported by the pump case at a region which is closer to the input end via a plurality of bearing members.

Abstract: There is provided a pump unit including a plurality of hydraulic pump bodies disposed in parallel to each other, a plurality of pump shafts respectively supporting the plurality of hydraulic pump bodies in a relatively non-rotatable manner and a pump housing accommodating the plurality of pump bodies and supporting the plurality of pump shafts in a rotatable manner around respective axis lines, wherein each of the plurality of pump shafts has at least one end extending outward from the pump housing so as to form an input end.

Abstract: There is provided a working vehicle having first and second hydraulic pump units operatively driven by a driving source and arranged away to each other in a width direction of the vehicle. In the working vehicle, each of the first and second hydraulic pump units includes a pump body; a port block formed with an oil passage for supplying/discharging an operating fluid to/from said pump body; a pump case connected to the port block so as to define a pump body accommodating space for surrounding the pump body; and a pump shaft for rotatably driving the pump body, the pump shaft having an input end operatively connected to said driving source. A drain port for opening the pump body accommodating space outward and a charge suction port for drawing in an oil from an oil tank in order to supply a charge oil to a hydraulic circuit fluidly connecting with the corresponding hydraulic motor unit are provided respectively in first and second assemblies formed by the corresponding pump case and port block.

Abstract: There is provided a working vehicle having first and second hydraulic pump units operatively driven by a driving source and arranged away to each other in a width direction of the vehicle. In the working vehicle, each of the first and second hydraulic pump units includes a pump body; a port block formed with an oil passage for supplying/discharging an operating fluid to/from said pump body; a pump case connected to the port block so as to define a pump body accommodating space for surrounding the pump body; and a pump shaft for rotatably driving the pump body, the pump shaft having an input end operatively connected to said driving source. A drain port for opening the pump body accommodating space outward and a charge suction port for drawing in an oil from an oil tank in order to supply a charge oil to a hydraulic circuit fluidly connecting with the corresponding hydraulic motor unit are provided respectively in first and second assemblies formed by the corresponding pump case and port block.

Abstract: There is provided a pump unit configured to be capable of transmitting a rotational power from a driving power source which is operatively connected thereto to an actuator through a pair of hydraulic fluid lines. The pump unit includes: an input shaft; a hydraulic pump main body; a PTO shaft; a PTO clutch mechanism; an auxiliary pump main body; a suction line; a discharge line; a charge line; a PTO hydraulic fluid line; a pressure-reducing valve; and a resistance valve. The PTO hydraulic fluid line and the charge line are fluidly connected to the primary side and a secondary side of the pressure-reducing valve, respectively.

Abstract: There is provided a pump unit configured to be capable of transmitting a rotational power from a driving power source which is operatively connected thereto to an actuator through a pair of hydraulic fluid lines. The pump unit includes: an input shaft; a hydraulic pump main body; a PTO shaft; a PTO clutch mechanism; an auxiliary pump main body; a suction line; a discharge line; a charge line; a PTO hydraulic fluid line; a pressure-reducing valve; and a resistance valve. The PTO hydraulic fluid line and the charge line are fluidly connected to the primary side and a secondary side of the pressure-reducing valve, respectively.

Abstract: There is provided a wheel motor device including a variable-rotation output unit for outputting rotational power of a variable-rotation output body accommodated in a variable-rotation output body housing via a variable-rotation output shaft rotating about a reference axis line; and a reduction unit including a reduction gear mechanism for reducing rotation speed of the variable-rotation output shaft and a gear housing for accommodating the reduction gear mechanism.

Abstract: There is provided a pump unit including: a pump shaft operatively connected to a driving source; a cylinder block rotatably driven by the pump shaft; a piston unit accommodated in the cylinder block in a slidable manner in an axial direction; a movable swash plate oscillatable on an operational axis perpendicular to the pump shaft, the movable swash plate defining a slide range of the piston unit in abutment against the piston unit; a transmission gear supported by the pump shaft in a relatively non-rotatable manner, the transmission gear being disposed in such a manner as to face to the movable swash plate; a driven member operatively driven by the transmission gear; and a pump case supporting the pump shaft and accommodating therein the cylinder block, the piston unit, the movable swash plate, the transmission gear and the driven member.