US 6,457,546 B1Granted

Transmission mechanism of vehicle with HST and pressure oil feeding device for the mechanism

AssigneeKanzaki Kokyukoki Mfg. Co., Ltd.

InventorsYoshitaka Ishimaru, Shusuke Nemoto, Shigenori Sakikawa, Kenichi Takada

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Abstract

A transmission mechanism and a pressure oil supply system therefor are provided for use in work vehicles provided with a work device externally of the body of the vehicle at longitudinal one side thereof, the transmission mechanism being simple in construction and serving to shorten the overall length of the vehicle while holding a transmission shaft interconnecting a PTO shaft and an input shaft for the work device close to a horizontal. A work vehicle provided with a work device in front of the vehicle body comprises a transmission 30 disposed between a differential gear unit 10 and an HST 20 and providing a travel cooperative mechanism, a PTO shaft projecting from the housing of the HST 20, and a PTO cooperative mechanism disposed in the housing for dividedly deriving power for the PTO shaft from the travel cooperative mechanism for the transmission of the power. The HST 20 comprises a hydraulic pump 22 having a pump shaft 22a for receiving an input at its rear end, and a hydraulic motor 23 having a motor shaft 23a for delivering a front wheel driving force and a rear wheel driving force from the front end and rear end thereof, respectively.

Claims29

Dependent claims

A transmission mechanism for a work vehicle having a differential gear unit, an HST and a drive source which are arranged in a body of the vehicle from a longitudinal first side of the vehicle body in a first direction, toward a second side thereof in a second direction so as to drive axles positioned toward said first side, the vehicle having a work device disposed externally of the vehicle body toward the first direction, the transmission mechanism comprising:

a travel power transmission path for transmitting power from the drive source to the differential gear unit via the HST, and a PTO power transmission path for dividedly transmitting the power from the travel power transmission path to a PTO unit for driving the work device,
the travel power transmission path further comprising a transmission for transmitting an output of the HST to the differential gear unit,
the transmission constituting a portion of the travel power transmission path and having a casing, and an input portion for receiving the power from the drive source, an output portion coupled to the differential gear unit and a travel cooperative mechanism coupling the input portion to the output portion which are housed in the casing,
the HST comprising a hydraulic pump having a pump shaft extending longitudinally of the vehicle body, a hydraulic motor having a motor shaft rotatable in cooperation with the hydraulic pump, and an HST housing accommodating the hydraulic pump and the hydraulic motor therein, the pump shaft having one end extending outward from the HST housing in the second direction and being connectable to a shaft of the drive source, the motor shaft having one end extending in the first direction into the transmission casing and connected to the input portion of the transmission, and
the PTO unit comprising a PTO shaft supported by the HST housing so as to extend from the HST housing in the first direction, and a PTO cooperative mechanism accommodated in the HST housing and coupling the pump shaft to the PTO shaft to provide the PTO power transmission path.

2 more elements

A transmission mechanism comprising a differential gear unit, an HST and a drive source which are arranged in a body of a vehicle from a longitudinal firstside of the vehicle body in a first direction toward a second side thereof in a second direction so as to drive axles positioned toward said one side,

wherein the HST comprises a hydraulic pump having a pump shaft extending longitudinally of the vehicle, a hydraulic motor cooperative with the hydraulic pump and having a motor shaft disposed in parallel to the pump shaft, and a housing accommodating the hydraulic pump and the hydraulic motor therein,
wherein the hydraulic pump is adapted to receive power from the drive source by the pump shaft at an end thereof toward the second direction, and
wherein the hydraulic motor is adapted to output a driving force to be delivered to the differential gear unit from the motor shaft at an end thereof toward the first direction and to output a driving force to be delivered to wheels toward the second direction from the motor shaft at an end thereof toward the second direction.

A transmission mechanism for a vehicle so adapted that power from a drive source installed in a body of the vehicle is transmitted to a travel device and a PTO unit via an HST disposed outwardly of the drive source in a longitudinal direction of the vehicle, wherein the transmission mechanism comprises the HST for receiving a driving force from the drive source, and the PTO unit for receiving an output from the HST,

wherein the PTO unit comprises a PTO shaft, a hydraulic clutch for effecting or interrupting power transmission to the PTO shaft, a charge pump for supplying a hydraulic fluid to the clutch, and a hydraulic circuit for interconnecting the clutch and the charge pump,
wherein the HST comprises a hydraulic pump having a pump shaft extending longitudinally of the vehicle and connected at an inward end thereof to a shaft of the drive source, a hydraulic motor having a motor shaft rotatable in cooperation with the hydraulic pump, and a housing accommodating the hydraulic pump and the hydraulic motor therein, the pump shaft having an outward end projecting from the housing outward longitudinally of the vehicle, the housing having a main body accommodating the hydraulic pump and the hydraulic motor therein, and an extension extending outward widthwise of the vehicle from a side of the main body at which side the hydraulic pump is positioned,
wherein the charge pump has a casing liquid-tightly surrounding the projection of the pump shaft and being adapted to perform a pumping action for the clutch by the rotation of the pump shaft,
wherein the PTO shaft is supported by the housing extension longitudinally of the vehicle and having an outer end projecting outward longitudinally of the vehicle, and
wherein the hydraulic clutch is supported by the PTO shaft within the housing extension.

2 more elements

A transmission mechanism comprising a differential gear unit, an HST and a drive source which are arranged in a body of a vehicle from a longitudinal first side of the vehicle body in a first direction toward a second side thereof in a second direction so as to drive axles positioned toward said first side,

wherein the HST comprises a hydraulic pump having a pump shaft extending longitudinally of the vehicle for receiving a driving force from the drive source, a hydraulic motor cooperative with the hydraulic pump and having a motor shaft disposed in parallel to the pump shaft for outputting a driving force for travel, and a housing accommodating the hydraulic pump and the hydraulic motor therein,
wherein the housing has a space accommodating the pump and the shaft therein and serving as a reservoir for lubricating oil,
wherein the housing further accommodates a PTO unit, and a PTO power transmission path for devidedly transmitting to the PTO unit the power to be delivered from the drive source to the HST, and
wherein the PTO unit comprises a clutch for effecting or interrupting transmission of the driving force.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 09/485,307Filed 15 May 2000
Priority: JP 10-1580305 Jun 1998
Granted: 1 Oct 2002
Term ends: Not estimatedThe source records don’t support an estimate.

Classification17 codes

B60K 25/06
Auxiliary drives: from the transmission power take-off
A01D 69/002
Driving mechanisms or parts thereof for harvesters or mowers: driven by power take-off
B60K 17/105
Of fluid gearing: units comprising at least a part of the gearing and a torque-transmitting axle, e.g. transaxles
B60K 17/22
Arrangement or mounting of transmissions in vehicles: characterised by arrangement, location, or type of main drive shafting, e.g. cardan shaft