US 5,957,235 AGranted

Traveling drive apparatus in a working vehicle

AssigneeKomatsu Ltd.

InventorsSatoru Nishimura, Hikosaburo Hiraki, Hiroyuki Inoue

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Abstract

There is provided a traveling drive apparatus in a working vehicle having a traveling body with front wheels and rear wheels which are adapted to be controlledly driven respectively, characterized in that: the traveling body has mounted thereon an engine, a transmission and a hydraulic pump which are coupled to the engine and a first hydraulic motor that is adapted to be driven by the hydraulic pump whereas a left hand side wheel and a right hand side wheel on one of a front side and a rear side of the traveling body are adapted to be selectively coupled to either of an output side of the engine and an output side of the first hydraulic motor; and a left hand side wheel and a right hand side wheel of the other of the front side and the rear side are mounted on a suspension unit having a second hydraulic motor and a third hydraulic motor which are provided independently of each other and are adapted to be driven by the hydraulic pump and which are respectively coupled to the left hand side wheel and the right hand wheel of the other of the front side and the rear side of the traveling body.

Claims13

Dependent claims

A traveling drive apparatus in a working vehicle, comprising a traveling body with front wheels and rear wheels which are adapted to be driven respectively in a controlled manner and a turning body mounted to the traveling body, an engine and a transmission being mounted to said traveling body, and said engine being provided at either one side of the front and rear wheels,

wherein the transmission includes a pump means and a first hydraulic motor and an output shaft of the transmission is coupled to one side of the front and rear wheels at which the engine is not provided in a manner that the transmission is operatively connected to the first hydraulic motor in an operation starting time and is operatively connected to an output side of the engine in a high speed traveling operation, and
wherein second and third hydraulic motors are provided for another one side of the front and rear wheels at which the engine is provided and coupled to the another one side of the wheels through speed reduction mechanisms, and clutches are further provided for suspension units so as to perform connecting and disconnecting operations of the second and third hydraulic motors to the wheels through the speed reduction mechanisms.

Dependencies are inferred from the claim text.

Facts

Application: 08/700,479Filed 6 Sep 1996
Priority: JP 6-0356877 Mar 1994
Granted: 28 Sep 1999
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

B60K 23/0808
For changing number of driven wheels , for switching from driving one axle to driving two or more axles: for varying torque distribution between…
B60K 17/043
Characterised by arrangement, location or kind of gearing: transmission unit disposed in on near the vehicle wheel, or between the differential…
B60K 17/046
Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel: with planetary gearing having…
B60K 17/356
For driving both front and rear wheels, e.g. four wheel drive vehicles: having fluid or electric motor, for driving one or more wheels