Abstract: A clutch hub includes oil supply holes extending therethrough to supply lubricating oil from an interior of the clutch hub toward first clutch plates and second clutch plates. An injection port to allow injection of the lubricating oil into the interior of the clutch hub is located inside of the clutch hub between the clutch hub and a rotation axis of a clutch body. The clutch hub includes an inner circumferential portion including an opposing portion opposing the injection port, and a first portion closer to a first end portion of the clutch hub than the opposing portion in a direction extending along the rotation axis. The first portion includes an inclined inner circumferential surface structured such that a radius of the clutch hub decreases toward the first end portion.

Abstract: A hydraulic clutch includes friction plates to transmit motive power, a piston movable between (i) a pressing position, at which the piston presses the friction plates for the hydraulic clutch to be engaged to transmit motive power, and (ii) a separated position, at which the piston is spaced apart from the friction plates for the hydraulic clutch to be disengaged to block motive power, the piston being movable into the pressing position in response to receiving hydraulic fluid to move the piston toward the pressing position, and a holder to (i) hold the piston at an intermediate position between the pressing position and the separated position in response to the piston coming into contact with the holder and (ii) release the piston from the intermediate position.

Abstract: A hydraulic clutch includes friction plates to transmit motive power, a piston movable between (i) a pressing position, at which the piston presses the friction plates for the hydraulic clutch to be engaged to transmit motive power, and (ii) a separated position, at which the piston is spaced apart from the friction plates for the hydraulic clutch to be disengaged to block motive power, the piston being movable into the pressing position in response to receiving hydraulic fluid to move the piston toward the pressing position, and a holder to (i) hold the piston at an intermediate position between the pressing position and the separated position in response to the piston coming into contact with the holder and (ii) release the piston from the intermediate position.

Abstract: There is provided a work vehicle including a partition wall to keep partition between a first space zone as part of an internal space of the transmission case in which a differential mechanism is located and a second space zone as part of the internal space which is adjacent to the first space zone. An upper space is disposed above the partition wall and configured to allow lubricating oil scooped up from the first space zone by a ring gear to flow in the second space zone. A flow-out path is disposed below the upper space and configured to allow the lubricating oil to flow out of the second space zone to the first space zone.

Abstract: A work vehicle includes: a power transmission shaft drivable to rotate; a shaft holder holding the power transmission shaft in such a manner that the power transmission shaft is rotatable; and a hydraulically operable section configured to operate in response to receiving operating oil, the power transmission shaft including: a shaft groove extending entirely around an outer circumferential portion of the power transmission shaft; an inlet port extending inside the power transmission shaft in a radial direction of the power transmission shaft and connected with the shaft groove; and a supply oil passage extending inside the power transmission shaft in a longitudinal direction of the power transmission shaft and connected with the inlet port inside the power transmission shaft.

Abstract: A power transmission device for a work vehicle includes: a transmission case; a gear transmission contained in the transmission case and configured to receive motive power from a power source; a differential mechanism contained in the transmission case and configured to receive motive power from the gear transmission and transmit the motive power to a left wheel and a right wheel; and a gear cover covering a lower portion of a ring gear of the differential mechanism.

Abstract: A clutch hub includes oil supply holes extending therethrough to supply lubricating oil from an interior of the clutch hub toward first clutch plates and second clutch plates. An injection port to allow injection of the lubricating oil into the interior of the clutch hub is located inside of the clutch hub between the clutch hub and a rotation axis of a clutch body. The clutch hub includes an inner circumferential portion including an opposing portion opposing the injection port, and a first portion closer to a first end portion of the clutch hub than the opposing portion in a direction extending along the rotation axis. The first portion includes an inclined inner circumferential surface structured such that a radius of the clutch hub decreases toward the first end portion.

Abstract: A work vehicle includes: a power transmission shaft drivable to rotate; a shaft holder holding the power transmission shaft in such a manner that the power transmission shaft is rotatable; and a hydraulically operable section configured to operate in response to receiving operating oil, the power transmission shaft including: a shaft groove extending entirely around an outer circumferential portion of the power transmission shaft; an inlet port extending inside the power transmission shaft in a radial direction of the power transmission shaft and connected with the shaft groove; and a supply oil passage extending inside the power transmission shaft in a longitudinal direction of the power transmission shaft and connected with the inlet port inside the power transmission shaft.

Abstract: A work vehicle includes a vehicle body provided with a travel device; a prime mover provided in the vehicle body; a transmission device capable of speed-changing a driving force from the prime mover and transmitting the driving force to the travel device; a transmission case housing the transmission device and being filled with lubricating oil; and a control device capable of switching between a warm-up operation mode in which a gear of the transmission device is rotated in a state in which transmission of power from the transmission device to the travel device is blocked and a travel operation mode in which the gear is rotated in a state in which the power is transmitted from the transmission device to the travel device.

Abstract: There is provided a work vehicle including a partition wall to keep partition between a first space zone as part of an internal space of the transmission case in which a differential mechanism is located and a second space zone as part of the internal space which is adjacent to the first space zone. An upper space is disposed above the partition wall and configured to allow lubricating oil scooped up from the first space zone by a ring gear to flow in the second space zone. A flow-out path is disposed below the upper space and configured to allow the lubricating oil to flow out of the second space zone to the first space zone.

Abstract: A work vehicle includes a hydrostatic stepless speed changer device configured to speed-change driving power of an engine steplessly, a plurality of planetary gear speed changer devices configured to speed-change the driving power speed-changed by the stepless speed changer device, a plurality of clutch mechanisms corresponding to the plurality of planetary gear speed changer devices in order to take off the driving powers from these plurality of planetary gear speed changer devices individually, and a traveling speed changer device for speed-changing and transmitting the driving powers transmitted from the plurality of clutch mechanisms to a traveling mechanism. The plurality of planetary gear speed changer devices the plurality of clutch mechanisms and the traveling speed changer device are accommodated in a transmission case.

Abstract: A power transmission device for a work vehicle includes: a transmission case; a gear transmission contained in the transmission case and configured to receive motive power from a power source; a differential mechanism contained in the transmission case and configured to receive motive power from the gear transmission and transmit the motive power to a left wheel and a right wheel; and a gear cover covering a lower portion of a ring gear of the differential mechanism.

Abstract: A work vehicle includes a vehicle body provided with a travel device; a prime mover provided in the vehicle body; a transmission device capable of speed-changing a driving force from the prime mover and transmitting the driving force to the travel device; a transmission case housing the transmission device and being filled with lubricating oil; and a control device capable of switching between a warm-up operation mode in which a gear of the transmission device is rotated in a state in which transmission of power from the transmission device to the travel device is blocked and a travel operation mode in which the gear is rotated in a state in which the power is transmitted from the transmission device to the travel device.

Abstract: A work vehicle includes a hydrostatic stepless speed changer device configured to speed-change driving power of an engine steplessly, a plurality of planetary gear speed changer devices configured to speed-change the driving power speed-changed by the stepless speed changer device, a plurality of clutch mechanisms corresponding to the plurality of planetary gear speed changer devices in order to take off the driving powers from these plurality of planetary gear speed changer devices individually, and a traveling speed changer device for speed-changing and transmitting the driving powers transmitted from the plurality of clutch mechanisms to a traveling mechanism. The plurality of planetary gear speed changer devices the plurality of clutch mechanisms, and the traveling speed changer device are accommodated in a transmission case.

Abstract: A semiconductor device includes: an insulating film provided on a back surface of a semiconductor substrate; a plurality of isolation regions provided to reach the insulating film from a main surface of the semiconductor substrate; at least a first semiconductor layer and a second semiconductor layer which are electrically insulated from each other by the isolation regions in the semiconductor substrate; a first voltage applied terminal electrically connected to a front surface of the first semiconductor layer; a second voltage applied terminal electrically connected to a front surface of the second semiconductor layer; a selector circuit receiving voltages from the first voltage applied terminal and the second voltage applied terminal, and supplying an output in accordance with a combination of the voltages; and a conductive layer provided so as to contact with the insulating film provided to the back side of the semiconductor substrate.

Abstract: A semiconductor device includes: an insulating film provided on a back surface of a semiconductor substrate; a plurality of isolation regions provided to reach the insulating film from a main surface of the semiconductor substrate; at least a first semiconductor layer and a second semiconductor layer which are electrically insulated from each other by the isolation regions in the semiconductor substrate; a first voltage applied terminal electrically connected to a front surface of the first semiconductor layer; a second voltage applied terminal electrically connected to a front surface of the second semiconductor layer; a selector circuit receiving voltages from the first voltage applied terminal and the second voltage applied terminal, and supplying an output in accordance with a combination of the voltages; and a conductive layer provided so as to contact with the insulating film provided to the back side of the semiconductor substrate.