Abstract: Transaxle systems for a vehicle are disclosed where each of right and left transaxle units includes a hydraulic pump, a hydraulic motor and a casing incorporating the hydraulic pump and motor. Each hydraulic pump has a pump displacement control means operatively connected to a pump control arm pivoted on the casing, and each hydraulic motor has a motor displacement control means operatively connected to a motor control arm pivoted on the casing. A single motor controlling manipulator is operatively connected to the motor control arms to simultaneously shift the motor displacement control means of the right and left transaxle units between large displacement positions and small displacement positions.

Abstract: An outer circumferential surface of a trunnion shaft includes a sliding contact region that has a circular arc shape as viewed along a slanting axis line and is substantially brought into contact with an inner circumferential surface of the bearing portion in a rotatably sliding manner, and at least one suction groove that forms a pocket portion between the suction groove and the inner surface of the bearing portion. The pocket portion is opened to an inner space of housing on at least one side in an axis line direction of the trunnion shaft.

Abstract: A hydraulic motor unit according to the present invention includes an electric motor having an electric motor main body that is electrically controlled, an electric motor case that accommodates the electric motor main body and an electric motor main body output shaft that is rotated around an axis line thereof by the electric motor main body, the electric motor case being detachably mounted to the motor housing, wherein mounting of the electric motor to the motor housing causes the electric motor main body output shaft to be operatively connected to the first end of the control shaft so that the control shaft is rotated around the axis line in accordance with rotation of the electric motor main body output shaft.

Abstract: A hydraulic motor unit according to the present invention includes an electric motor having an electric motor main body that is electrically controlled, an electric motor case that accommodates the electric motor main body and an electric motor main body output shaft that is rotated around an axis line thereof by the electric motor main body, the electric motor case being detachably mounted to the motor housing, wherein mounting of the electric motor to the motor housing causes the electric motor main body output shaft to be operatively connected to the first end of the control shaft so that the control shaft is rotated around the axis line in accordance with rotation of the electric motor main body output shaft.

Abstract: A hydraulic actuator unit includes a first electric motor assembly formed by mounting one of a pair of electric motors to one of a pair of electric motor covers, wherein the first electric motor assembly is detachably mounted to a pump case so as to rotate a first control shaft around its axis line, and a second electric motor assembly formed by mounting the other one of the pair of electric motors to the other one of the pair of electric motor covers, wherein the second electric motor assembly is detachably mounted to the pump case so as to rotate a second control shaft around its axis line.

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 motor unit according to the present invention includes an electric motor having an electric motor main body that is electrically controlled, an electric motor case that accommodates the electric motor main body and an electric motor main body output shaft that is rotated around an axis line thereof by the electric motor main body, the electric motor case being detachably mounted to the motor housing, wherein mounting of the electric motor to the motor housing causes the electric motor main body output shaft to be operatively connected to the first end of the control shaft so that the control shaft is rotated around the axis line in accordance with rotation of the electric motor main body output shaft.

Abstract: In the hydraulic actuator unit according to the present invention, a first electric motor assembly formed by mounting one of a pair of electric motors to one of a pair of electric motor covers is detachably mounted to a pump case so as to rotate a first control shaft around its axis line, and a second electric motor assembly formed by mounting the other one of the pair of electric motors to the other one of the pair of electric motor covers is detachably mounted to the pump case so as to rotate a second control shaft around its axis line.

Abstract: A vehicle transaxle system includes a pair of right and left transaxle units equipped on a vehicle. The right transaxle unit supports a single right axle, and the left transaxle unit supports a single left axle. A variable displacement hydraulic pump is disposed in each of the right and left transaxle units so as to be driven by power from a prime mover of the vehicle. A variable displacement hydraulic motor is disposed in each of the right and left transaxle units and is fluidly connected to the corresponding hydraulic pump so as to drive the corresponding right or left axle. A movable motor displacement control member is provided in each of the transaxle unit so as to be moved to change the displacement of the corresponding hydraulic motor. An interlocking connection means is connected to both the movable motor displacement control members of the respective hydraulic motors.

Abstract: A hydraulic four-wheel-drive working vehicle includes a front/rear differential-lock switch valve. The front/rear differential-lock switch valve fluidly connects forward-movement high-pressure lines of the pair of main operation fluid lines, which are fluidly connected to a main hydraulic motor, and the pair of sub operation fluid lines, which are fluidly connected to a sub hydraulic motor, and also fluidly connects the forward-movement low-pressure lines of the pair of main operation fluid lines and the pair of sub operation fluid lines. The front/rear differential-lock switch valve is capable of taking a throttling fluid-connection state of fluidly connecting the corresponding lines in a state where a throttle is interposed therebetween and a full fluid-connection state of fluidly connecting the corresponding lines in a state where the throttle is not interposed therebetween.

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: 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: 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.

Abstract: 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 auxil

Abstract: 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.

Abstract: A power-dividing device for a working vehicle includes a case member, an input shaft supported by the case member so that a first end portion of the input shaft can be operatively connected to a driving source, a PTO unit having a PTO shaft supported by the case member so as to be offset with respect to the input shaft, a power transmission mechanism accommodated in the case member to transmit power from the input shaft to the PTO shaft, and a first pump unit having a first pump shaft operatively connected to the input shaft and being fluid-connected to an actuator disposed outside.

Abstract: There is provided a wheel motor device comprising a hydraulic motor main body, a speed reduction gear mechanism for reducing a speed of a rotational output of the hydraulic motor main body, an output member for outputting the rotational output whose speed has been reduced by the speed reduction gear mechanism to a driving wheel and a casing for accommodating the hydraulic motor main body and the speed reduction gear mechanism. The casing has a motor space and a gear space for respectively accommodating the hydraulic motor main body and the speed reduction gear mechanism, the motor space being capable of storing fluid in a state of being liquid-tightly separate from the gear space. The casing is provided with a flow-in port for introducing fluid into the motor space and a flow-out port for discharging fluid outward from the motor space.

Abstract: Disclosed is a load controller for use in a hydrostatic transmission for a work vehicle. Power supplied from an engine is branched to drive an implement system and a traveling system. The hydrostatic transmission connects, in an oil-hydraulic closed circuit, an oil-hydraulic pump driven by the engine and an oil-hydraulic motor driven by the oil-hydraulic pump. The load controller includes a bypass oil line for bypassing an oil line that has high pressure during forward movement in the oil-hydraulic closed circuit to reach an oil line that has low pressure during forward movement or an oil tank; a first opening/closing valve for opening or closing the bypass oil line; and an opening/closing valve controller that detects a load applied to the engine while traveling during working and opens the first opening/closing valve when the load exceeds a predetermined level.

Abstract: There is provided a 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 sucti