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一、概述收录机的调谐机构一般是依靠拉线与调谐轴之间摩擦传动实现的。设计时,要求指针在行程内不能出现打滑。当指针移到刻度盘的端点时,拉线与调谐轴之间的最大摩擦力矩要小于可变电容器的定位力矩,使拉线在调谐轴上打滑,可变电容器便可得到保护,这就是“自滑”。此时,轴与拉线之间所产生的最大摩擦力矩称作“自滑力矩”。设计时总是希望调谐轴按顺时针或逆时针方向旋转时,所产生的最大摩擦力矩尽可能地相等。然而,在实际中调谐机构的摩擦力矩不易做到两端一样大小,即出现最大摩擦力矩不对称现象。
First, an overview Tuner tuning mechanism is generally relying on the friction between the cable and the tuning shaft transmission. When designing, it is required that the pointer can not slip during the journey. When the pointer moves to the end of the dial, the maximum friction torque between the cable and the tuning shaft is less than the positioning torque of the variable capacitor, so that the cable slipping on the tuning shaft, the variable capacitor can be protected, which is “self- ”. At this point, the maximum friction torque between the shaft and the cable is called “self-slip torque.” When designing, it is always desirable that the maximum frictional torque generated by the tuning shaft be as equal as possible when it is rotated clockwise or counterclockwise. However, in practice, the friction torque of the tuning mechanism is not easy to achieve the same size at both ends, ie, the maximum friction torque asymmetry occurs.