| 摘要 |
PURPOSE:To prevent wrong functioning by driving a servomechanism comprising of two screws and their flanks under control made by a driver and a fluid pressure actuator. CONSTITUTION:In a V-belt type stepless speed change gear having servo- mechanisms 6, 7 and a cam mechanism 8, running is done at constant reduced speed and pressure by bringing a first screw 37 and a second screw 61 into contact with a second flank 102 without a ball 37a, and the speed is changed by causing the stroke of a movable flange 3B through driving means composed of an oil pressure servo 9A and a driver. Consequently the inserting pressure of the V-belt in changing the speed can be properly adjusted by controlling the pressure in the oil pressure servo, and quick speed change becomes possible. In addition, the buffer effect of the oil pressure servo can relieve the sudden action of the driver. |
