Small shell knob gear shifting mechanism

The utility model discloses a small shell knob gear shifting mechanism, which belongs to the technical field of rotary gear shifting and comprises a knob middle shell, a knob spring, a knob inner shell, a knob outer shell and a knob cap, the knob middle shell is fixedly connected with the knob inner shell, and the knob spring is arranged between the knob middle shell and the knob inner shell. One end of the knob spring is connected with the knob middle shell, the other end of the knob spring is connected with the knob inner shell, the knob inner shell is fixedly connected with the knob outer shell, and the knob outer shell is connected with the knob cap. The automatic clamping design between rotary parts is achieved in a spring pre-tightening mode, simplicity and stability of the rotary mechanism are improved, the rotary mechanism can be used for various electronic devices, rotary motion between shells is completed in a mode of mechanically driving a rotary knob, and the gear shifting adjusting function of th