Drive transmission for working vehicles

Details Drive transmission for working vehicles Drive transmission for working vehicles

1995-06-01

1996-10-01

Hurley, Kevin T.

Motor vehicles

Having four wheels driven

Including pump and fluid motor, or generator and electric...

180307, 60490, B60K 17356

Patent

active

055604471

ABSTRACT:
A vehicle drive transmission includes a hydrostatic transmission (14) which comprises a hydraulic motor (16) of a variable displacement type. Swash plate (29) of this motor is displaced from its neutral position in one direction in a stepwise manner to plural angular positions. The motor is used for setting one of plural speed ranges or low-speed and high-speed ranges of vehicle within which vehicle speed can be changed in a non-stepwise manner by a hydraulic pump (15) having a non-stepwisely displaceable swash plate (28). Output shaft (18) driven by the motor is connected to rear wheels (2) for a constant drive thereof through a mechanical transmission mechanism (21) and to front wheels (1) for a selective drive thereof through a clutch mechanism (26; 126; 226). The clutch mechanism preferably includes a one-way clutch (85) for providing a selective drive mode in which front wheels are additionally driven automatically when slipping of the rear wheels is caused during the two wheel-drive condition.

REFERENCES:
patent: 4579183 (1986-04-01), Irikura et al.
patent: 5078659 (1992-01-01), Von Kaler et al.
patent: 5177964 (1993-01-01), Tanaka et al.
patent: 5188193 (1993-02-01), Schroeder
patent: 5207060 (1993-05-01), Sheets

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