| 摘要 |
PURPOSE:To contrive to prevent the slippage of a transmission belt from occurring by a structure wherein cam mechanisms to increase the force of a spring with the increase of the difference between the rotational speed of an output shaft and that of one rotating body is provided in a transmission device, in which the one rotating body of an output split pulley is energized through a sleeve in the direction toward the other rotating body by the spring. CONSTITUTION:A belt type stepless transmission device consists in winding a transmission belt 12 across an input split pulley 9 attached to an input shaft 8 connected to an engine 6 (not shown) and an output split pulley 11 attached to an output shaft 10 connected to an transmission gear. In this case, the first rotating body 11a of the output split pulley 11 is fitted onto a sleeve 13, which is splinedly fitted onto the output shaft 10 and at the same time energized through a pair of pins 14 attached on said rotating body 11a in the direction toward a second rotating body 11b by means of a spring 15. In addition, notches 13a are provided at the parts, in which the pins 14 of the sleeve 13 are inserted, so as to form cam surfaces 20 on the parts of the inner wall surfaces of the notches 13a in order to realize cam mechanisms 22 by annexing rollers 21, each of which contacts against the cam surface 20, to the pins 14. |
