초록 ▼

Disclosed is an actuator for a friction engagement device of the type adapted to allow power transmission between two shafts by releasing engagement of the friction engagement device concerned. The actuator comprises a torque/thrust conversion device composed of two elements and adapted to effect an

Disclosed is an actuator for a friction engagement device of the type adapted to allow power transmission between two shafts by releasing engagement of the friction engagement device concerned. The actuator comprises a torque/thrust conversion device composed of two elements and adapted to effect and release the engagment of the friction engagement device, a pair of gears respectively connected to the two elements, and a torque generating mechanism gear which is engaged with the pair of gears, the gear ratio between the torque generating mechanism gear and one of the pair of gears being slightly different from that between the torque generating mechanism gear and the other of the pair of gears. In this arrangement, the motor torque is directly converted into the power for effecting and releasing the engagement of the friction engagement device, whereby the control method is simplified and the response to the control signal expedited.

대표청구항 ▼

An actuator for a friction engagement device adapted for distributing torque to front and rear wheels of a four-wheel drive vehicle, which comprises: a clutch connected between said front wheel and the rear wheel for controlling distribution of torque to said front and rear wheels, a fixed case encl

An actuator for a friction engagement device adapted for distributing torque to front and rear wheels of a four-wheel drive vehicle, which comprises: a clutch connected between said front wheel and the rear wheel for controlling distribution of torque to said front and rear wheels, a fixed case enclosing said clutch, a torque generating mechanism gear having an electric motor immovably installed on an outer portion of said case, first and second gears coupled with an output shaft of said motor, and third and fourth gears respectively engaging said first and second gears for respectively providing a first and a second pair of gears, said first and second pair of gears having slightly different gear ratios for providing different torques, a torque-thrust force conversion means for converting a torque difference between two elements respectively connected with said third and fourth gears to a thrust force, a piston means for pressing said clutch in response to said thrust force output from said torque-thrust force conversion means, and a thrust bearing installed between said torque-thrust force conversion means and said piston means, wherein when said motor is activated, said clutch smoothly operates and controls said distribution of torque to said front and rear wheels.