Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1984-11-14
1987-05-12
Braun, Leslie
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74752C, 180247, B60K 4104
Patent
active
046639926
ABSTRACT:
A control system for a four-wheel drive transmission comprising a primary transmission and a transfer unit capable of establishing a high-speed four-wheel drive mode, a low-speed four-wheel drive mode and a two-wheel drive mode by the agency of friction coupling devices which are controlled selectively for engagement and disengagement by the corresponding hydraulic servomechanisms. The control system includes a source of line pressure, a manual selector valve interlocked with a shifting lever for selecting a desired drive mode, a running speed sensor which gives a signal corresponding to a running speed of the vehicle, an electronic control unit which compares the signal given by the running speed sensor with a threshold valve, decides whether or not the drive mode needs to be changed and gives an output signal, an inhibitor valve which supplies the line pressure selectively to the hydraulic servomechanisms or drains the same on the basis of a signal pressure corresponding to the output signal of the electronic control unit and the output signal pressure of the manual selector valve to establish an appropriate drive mode, and hydraulic circuits comprising valves and fluid lines. The threshold valve is selectively and optionally changeable.
REFERENCES:
patent: 4444073 (1984-04-01), Moroto et al.
patent: 4480505 (1984-11-01), Takano et al.
patent: 4481877 (1984-11-01), Takano et al.
patent: 4485695 (1984-12-01), Kawamoto
patent: 4503927 (1985-03-01), Hayakawa et al.
Fujiura Kaiya
Hayakawa Yoichi
Nakamura Shinya
Taga Yutaka
Aisin Warner Limited
Braun Leslie
Novais David
Toyota Motor Corporation
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