Spur Planetary Gearbox VS Helical Planetary Gearboxes

Spur planetary gearbox and helical planetary gearbox are two common types of planetary gearboxes, each with its own characteristics in structure, performance, and application. In this blog, we will dive into the differences between them.

 

1. Gear Design

A spur gear planetary gearbox uses spur gears, where the gear teeth are parallel along the width of the gear, with flat gear tops. Due to the simpler manufacturing process, spur gears are relatively cheaper to produce.

A helical gear planetary gearbox uses helical gears, where the gear teeth are inclined along the width of the gear, with angled gear tops. The design of helical gears allows the gears to mesh gradually, providing smoother engagement. The manufacturing process for helical gears is more complex and costly.

 

2. Accuracy

The accuracy of helical gear planetary reducers is higher than that of spur gear planetary reducers.

Spur planetary gearbox backlash: P2≤10 arcmin,P1≤6 arcmin

Helical planetary gearbox backlash: P2≤5 arcmin, P1≤ 1 arcmin

 

3. Noise and vibration

Spur gears generate higher noise and vibration during meshing, especially under high load and high-speed conditions. This is because the meshing of spur gears is instantaneous, causing shocks as the gear teeth enter and exit meshing.

 

As for the helical planetary gearbox, due to the gradual contact between the teeth during the meshing process of helical gears, the meshing becomes smoother and the noise is lower. So compared with spur planetary gearbox, helical planetary gearbox generate less vibration and has a smoother operation.

 

4.Torque and Efficiency

Under the same motor shaft, the torque transmission of spur planetary gearbox is smaller than that of the helical planetary reducer, resulting in lower transmission efficiency. So compared with spur planetary gearbox, helical planetary gearbox can produce more torque and have a higher efficiency.

 

5. Application field

Spur gear planetary gearboxes are suitable for low-speed, low-load applications, such as light machinery, small automation devices, and simple transmission systems. They are an economical and efficient choice when precision requirements are not high.

 

Helical gear planetary gearboxes are suitable for high-speed, high-load applications, such as heavy machinery, automotive transmissions, high-precision industrial equipment, and advanced automation equipment. The high precision and stability of helical gears make them ideal for applications requiring high accuracy and reliability.

 

conclusion

The spur planetary gearbox and the helical tooth planetary gearbox each have their own advantages and disadvantages, and the choice of which type of gearbox depends on the specific application requirements. If you need an efficient and cost sensitive solution, a spur planetary gearbox is a good choice; If a solution with high load, high precision, and smooth operation is needed, a helical planetary gearbox is more suitable. In practical applications, it is often necessary to comprehensively consider multiple factors such as cost, performance, noise, vibration, and maintenance to choose the most suitable gearbox type.

 

SIT is the leading planetary gearbox supplier in China, if you need want to know more info about planetary gearbox, please don't hesitate to contact us https://www.sitmotors.com/contact-us.