| 摘要 |
PURPOSE:To obtain the belt lateral pressure of a driven pulley matching with required speed change characteristic by changing the operation angle of a cam groove of a driven cam in relation to a roller pin to the extent from two steps up to the stepless condition. CONSTITUTION:If an operation angle of a cam groove 5g in relation to a roller pin 5f is set to theta(=45 deg.) in a low-speed and high torque driving area and theta1(<theta) on the way to high-speed and low torque driving area, the belt lateral pressure Q2 which works on a driven pulley 5 in low-speed and high torque driving area at this time is made larger than belt lateral pressure Q'2 in the high- speed and low torque driving area. Further, since the driving force of the driven pulley 5 becomes smaller than that of a linear cam groove when the engine speed reaches the definite number of revolution, automatic speed change of the pulley from the low-speed and high torque area to the high-speed and low torque area becomes easy and load of the engine is decreased, therefore, the car speed is increased in spite of a decrease in the number of engine revolution. |
