| 摘要 |
PURPOSE:To improve power transmission capacity of a power transmission gear using a slip limiting function due to viscous resistance of a high viscous fluid by utilizing an increase in pressure of the fluid caused by a temperature rise depending upon viscous resistance and thrust force produced at a cam mechanism. CONSTITUTION:While the turning force of an input shaft 1 is transmitted to the first and second transmission shafts 3, 9 through a differential gear unit 5, if a front wheel slips, for example, the driving torque of the first transmission shaft 3 is suddenly decreased. Whereupon, through the transmission shaft 3 is about to start high speed rotation, and a sudden relative rotation is about to occur between the first and second resistance plates 35, 37, power is transmitted by a slip limiting function due to viscous resistance of a high viscous fluid in a working chamber 33. At this time, clamping means 23, 39 are axially moved due to an increase in pressure caused by a temperature rise of the fluid to clamp both resistance plates 35, 37. Further, thrust force corresponding to the relative rotation resistance between both resistance plates 35, 37 is generated at a cam mechanism 21 to reliably clamp the resistance plates.
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