DRIVING POWER TRANSMISSION DEVICE AND ITS ADJUSTING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a driving power transmission device and its adjusting method capable of reducing a varied range of tuning for electric current-transmitting torque characteristic by changing only a value of clearance of a first clearance and also capable of minimizing the control for processing a yoke. SOLUTION: The driving power transmission device has a friction clutch 34 arranged between a front housing 31a located in the outer side and an inner shaft 30b located in the inner side, which are capable of relatively rotating each other. Torque transmission is performed between the front housing 31a and the inner shaft 30b so that an armature 35 is attracted by forming a magnetic passage Z by means of turning on electricity to an electric magnet 33 and accordingly, the friction clutch 34 is frictionally engaged. The passing sectioned area of a magnetic passage of the first clearance C1 is bigger than the passing sectioned area of a magnetic passage of a second clearance C2. Magnetic resistance of the magnetic passage Z is not easily changed though the clearance length of the first clearance C1 is changed. Adjustment of magnetic resistance of the magnetic passage Z is only performed by a change for a value of clearance of the first clearance C1 side.