Why do precision instruments mostly use helical gears?

A helical gear is a common mechanical transmission component, whose gear tooth surface is at a certain angle to the axis, which is called the bevel angle. Helical gears can mesh with gears with the same bevel angle to achieve transmission rotation. The tooth surface design of helical gears generally adopts a circular arc shape, which makes the meshing of the gear more stable, and can also improve the strength and service life of the gear. The number of teeth in helical gears is generally even, because helical gears with odd teeth are prone to producing unstable motion.

Compared with spur gears, helical gears have a larger tooth contact area, smoother transmission, and lower noise and vibration. The number of teeth and gear diameter of helical gears can be designed according to needs, which can meet different transmission requirements and are widely used in various mechanical equipment, such as vehicle transmission systems, engineering machinery, aerospace equipment, etc. Due to its high transmission efficiency, low noise, and long service life, it is considered an important mechanical transmission component.

The reasons why most precision instruments use helical gears are as follows:
1. Stable helical gear transmission: The tooth surface of a helical gear is inclined, which allows the gear to operate smoothly during transmission, reducing vibration and noise.

2. High transmission efficiency of helical gears. Helical gears have a large number of teeth, a large contact area, and high transmission efficiency, which can better transmit power.

3. High precision helical gears. The tooth surface of a helical gear is inclined, forming a certain angle with the horizontal direction, which can make the meshing of the gear more compact and accurate.

4. Helical gears have a wide range of applications. The number of teeth and gear diameter of helical gears can be designed according to needs, with a wide range of applications that can meet different transmission needs.