| 摘要 |
PURPOSE:To make the wearproofness of both cam plates improvable upon making them into a surface contact state, by making up each cam incline of first and second cam plates to be installed in a power transmission route with part of a spiral surface on the rotating axial circumference of each cam. CONSTITUTION:First and second cam plates 161 and 162 to be installed in a power route are formed in an expression alpha<beta made by a first incline (a) of an oblique angle alpha used in time of acceleration and a second incline (b) of another oblique angle beta used in time of deceleration each. Accordingly, with both cam plates parted away, such force that increases the friction force of a friction plate grows large in time of acceleration in the same torque and thereby there is easy to produce a slip so that a good adjustable speed characteristic is securable. Moreover, since each of inlines (a) and (b) is formed by part of a spiral surface S on the central axial circumference of each of these cam plates 161 and 162, at whatever relative rotation position they may be, both inclines (a) and (b) themselves being face-to-face come into a surface contact state. Like this way, cam surface pressure is held down to the minimum and its wearproofness is thus improved. |
