Helical Gear Motor Yuema
Helical Gear Motor is a gear that is basically the same as a straight gear, the difference lies in the tilted gear to form an angle to the axis (hole).
Generally the teeth on the tilted gear is divided into 2, the left and right sloping.
The opposite direction is used for the parallel shaft, the same direction is applied to the perpendicular axis. The sound is quieter than the straight gears, but the axial vibration is higher.