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China Ever-Power Transmission Co., Ltd.

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Crossed helical gears
These gears also transmit rotary motion and torque through a right angle. The teeth of a helical gear are inclined at an angle to the axis of rotation of the gear.
The diagram below shows how the axis of rotation of two helical gears are crossed at right angles. Helical gears are smoother running than spur gears and are more suitable for rotation at high velocities. An example of two crossed helical gears are shown below.
Crossed helical gears