Motor vehicles – Having four wheels driven – Including pump and fluid motor – or generator and electric...
Patent
1994-04-21
1996-10-15
Culbreth, Eric D.
Motor vehicles
Having four wheels driven
Including pump and fluid motor, or generator and electric...
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:
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patent: 4508190 (1985-04-01), Uchiyama
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patent: 4745826 (1988-05-01), Nishikawa et al.
patent: 5183132 (1993-02-01), Fujisawa
patent: 5330030 (1994-07-01), Eastman et al.
Ishii Norihiro
Kamada Takemi
Kawada Hirohiko
Suetsugu Yoshinori
Culbreth Eric D.
Kanzaki Kokyukoki Mfg. Co. Ltd.
Zeender F.
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