| 摘要 |
PURPOSE:To reduce a shock and sound in both operating directions by providing two spiral springs and independently setting shifting forces on both engaging side and separating side of a spline. CONSTITUTION:The fixing groove 38 for spiral springs 36, 37 and the holding plate 38 for the springs are fixed on an output shaft 34, and both ends of the two large and small spiral springs 36 and 37 having mutually different winding directions and rotation torques are installed on the groove 38 of the output shaft 34, and a rotary plate 35 and the holding plate 39 respectively. At the time of rotation in one direction of a worm wheel 32, the end part of the spiral spring 36 is brought into contact with the rotary plate 35 and the rotary plate 35 and the spiral spring 36 are integrally rotated. At the time of rotation in the other direction of the worm wheel 32, the rotary plate 35 is brought into contact with the end part of the spiral spring 37 and the rotary plate 35 and the spiral spring 37 are integrally rotated. |
