Motor vehicles – Having four wheels driven – With differential means for driving two wheel sets at...
Patent
1986-08-26
1988-07-05
Mitchell, David M.
Motor vehicles
Having four wheels driven
With differential means for driving two wheel sets at...
74665T, 74740, 74866, 192 0052, 192 0073, 192 0092, 3644241, B60K 1734
Patent
active
047548363
ABSTRACT:
A full time four wheel drive transmisson system for a vehicle includes a gear transmission mechanism, driven by an engine, which is automatically controlled to operate in any of several forward ranges of speed stages including a drive range and a set containing one or more intermediate hold ranges in which the engagement of at least one of the upper speed stages included in the drive range is prohibited. The transmission system also includes a central differential device, driven from the gear transmission mechanism, which provides rotational power to the combination of the front wheels of the automotive vehicle and to the combination of the rear wheels of the automotive vehicle while providing differential action between these combinations. The central differential device has a clutch which when engaged at least partly inhibits its differential action. During vehicle operation, the clutch of the central differential device is engaged when the gear transmission mechanism is being controlled to operate in one of the set of intermediate hold speed ranges. Thereby, good vehicle high power characteristics and good engine braking characteristics are obtained. The engagement of the central differential device clutch further may be conditional on the engine throttle being substantially fully closed.
REFERENCES:
patent: 4441575 (1984-04-01), Suzuki
patent: 4562541 (1985-12-01), Sakakiyama
patent: 4605087 (1986-08-01), Ashauer et al.
patent: 4618022 (1986-10-01), Hayashi
patent: 4650202 (1987-03-01), Tsuzuki
Harada Yoshiharu
Morisawa Kunio
Taga Yutaka
Hill Mitchell J.
Mitchell David M.
Toyota Jidosha & Kabushiki Kaisha
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