Four-wheel drive transmission for working vehicles

Motor vehicles – Having four wheels driven – Including pump and fluid motor – or generator and electric...

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Details

180247, 74473R, 74665F, 192 363, B60K 17356, B60K 2308, B60K 17354

Patent

active

055645186

ABSTRACT:
In a vehicle transmission comprising a hydrostatic transmission (13) and a rear-wheel drive assembly (20) including a two-stage speed change mechanism (28), a front-wheel drive assemly (22) having a front-wheel drive shaft (24) is disposed at a front side of the output shaft (17) and includes a clutch (55; 155; 255) such that when the change mechanism is shifted to its high-speed position the clutch is disengaged so as to provide a non-drive mode for front wheels. A selective drive mode is preferably provided by a one-way clutch (56) which is operable to connect the drive shaft to the output shaft only when forward directional rotation speed of the output shaft is larger than that of the drive shaft. In a preferred embodiment, the front-wheel drive assembly is shiftable at a low-speed position of the change mechanism between a constant drive mode and the selective drive mode. This drive assembly may also be fashioned such that it is shiftable at the low-speed condition between the constant or selective drive mode and non-drive mode.

REFERENCES:
patent: 4373597 (1983-02-01), Itatani et al.
patent: 4421335 (1983-12-01), Makishima et al.
patent: 4508190 (1985-04-01), Uchiyama
patent: 4579183 (1986-04-01), Irikura et al.
patent: 4592442 (1986-06-01), Wilson et al.
patent: 4609064 (1986-09-01), Suzuki et al.
patent: 4745826 (1988-05-01), Nishikawa et al.
patent: 5183132 (1993-02-01), Fujisawa
patent: 5330030 (1994-07-01), Eastman et al.

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