Four-wheel drive system
A four-wheel drive system is described having a torque transmission device between front wheels and rear wheels of a vehicle, the torque transmission device comprising: a stationary casing secured to a frame of the vehicle; an oil pump positioned in the casing and mechanically connected to be actuated by the relative rotations of a first rotating shaft connected to the front wheels and a second rotating shaft connected to the rear wheels for discharging pressure oil; a hydraulic clutch mounted in the casing; an electromagnetic throttle valve fluidically connected to the discharge passage and having a solenoid for varying a throttle opening thereof in response to an electric current applied to the solenoid so as to control the pressure of oil admitted in the cylinder chamber; a speed sensor for detecting a traveling speed of the vehicle; a steering angle sensor for detecting a rotational angle of a steering wheel of the vehicle; and control means electrically connected to the speed sensor, the steering angle sensor and the solenoid of the electromagnetic throttle valve for applying to the solenoid an electric current depending on signals from the speed sensor and the steering angle sensor so as to vary the throttle opening of the electromagnetic throttle valve wherein the oil pump and the hydraulic clutch are mounted on facing end portions of the first and second rotating shafts, respectively, in tandem fashion.
- Assignee:
- Toyota Koki Kabushiki Kaisha, Kariya
- Patent Number(s):
- US 4821604
- OSTI ID:
- 6053577
- Resource Relation:
- Patent File Date: Filed date 5 Jun 1987
- Country of Publication:
- United States
- Language:
- English
Similar Records
Motor vehicle, or 'kart' with independent suspension on all four wheels, for off-highway use
Lock-up control device for torque converter in automatic transmission for vehicle