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Do you know the internal structure of planetary reducer?

From a high-speed power plant such as an electric motor, an internal combustion engine, to the working end of the power plant, a process of lowering the speed and increasing the torque is required。 A reducer is a power transmission mechanism that realizes this process。

 

Planetary reducer overview

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The planetary speed reducer is a widely used industrial product。 The speed reducer has a small size, light weight, high load carrying capacity, long service life, stable operation, and low noise。 With power split, multi-tooth meshing features。 Maximum input power up to 104kW。 Applicable to crane, transport, construction machinery, metallurgy, mining, petrochemical, construction machinery, light industry and textiles, medical equipment, instrumentation, automotive, marine, weapons and aerospace and other industrial sectors of the new series of planetary WGN fixed shaft drive reducer , WN son gear drive reducer, elastic load less gear reducer。

The planetary speed reducer is a new type of speed reducer with a wide range of versatility。 Internal gears are carburized, quenched and ground with 20CvMnT。 The whole machine has the characteristics of small size, large output torque, high speed ratio, high efficiency, and safe and reliable performance。

Related concepts 

The number of stages: the number of planetary gear sets。 Because a set of star gear can not meet a large gear ratio, sometimes 2 or 3 sets are required to meet the requirements of the larger transmission ratio。 Due to the increase in the number of star gears, 2 The length of the 3-stage reducer will increase and the efficiency will decrease。

Backlash: The output is fixed and the input rotates clockwise and counterclockwise so that when the input produces a nominal torque of +-2%, there is a small angular displacement at the input of the reducer. This angular displacement is the return clearance. It is "point", which is one-sixtieth of a degree. Some people call it backlash.

 

Planetary reducer structure

 

Planetary reducer main transmission structure: planetary gear, sun gear, outer gear ring。

Planetary reducer due to structural reasons, single-stage deceleration is a minimum of 3, the maximum generally does not exceed 10, the common reduction ratio is: 3。4。5。6。8。10, the number of reducer generally does not exceed 3, but there are some large reduction ratio than the custom reducer Level 4 deceleration。 Here are the structures of several planetary speed reducers!

Planetary reducer working principle

 

(1) The ring gear is fixed, the sun gear is active, and the planet carrier is passive.

It can be seen from Figure 1 that this type of combination is a reduced speed drive. Normally, the transmission ratio is generally 2.5 to 5, and the steering is the same.


Legend 1

(2) The ring gear is fixed, the planet carrier is active, and the sun gear is passive。

As can be seen from Figure 2, this type of combination is a speed-increasing drive. The transmission ratio is generally 0.2 to 0.4 and the steering is the same.


Legend 2

(3) The sun gear is fixed, the gear ring is active, and the planet carrier is passive.

It can be seen from Figure 3 that this type of combination is a reduced speed drive, with a transmission ratio of 1.25 to 1.67 and the same steering.

 

Legend 3

(4) The sun gear is fixed, the planet carrier is active, and the ring gear is passive。

It can be seen from the demonstration that this type of combination is a speed-up transmission, the transmission ratio is generally 0.6 to 0.8, and the steering is the same.


Legend 4

(5) The planet carrier is fixed, the sun gear is active, and the ring gear is passive.

From the demonstration, it can be seen that this type of combination is a speed reduction drive, the transmission ratio is generally 1。5 to 4, and the steering is reversed。


Legend 5

(6) The planet carrier is fixed, the gear ring is active, and the sun gear is passive.

From the demonstration, it can be seen that this type of combination is a speed-up transmission。 The transmission ratio is generally 0。25 to 0。67, and the steering is reversed。


Legend 6

(7) Incorporating any two of the three components into one:

When the planet carrier and the ring gear are combined into one as the active part, the sun wheel is a passive part or the sun wheel and the planet carrier are integrated into one as the active part, and the ring gear is used as the movement condition of the passive part. There is no relative movement between the combined planetary gears. As a whole, the gear ratio is 1 and the steering is the same. This type of combination is often used in cars to form a direct file.

8) Any one of the three components is active and the remaining two components are free:

From the analysis, it can be seen that the remaining two components have no definite rotational speed output。

In the sixth combination method, due to the large increase in speed and the reverse of the active and passive components, this combination is not usually used in automobiles。

The remaining seven combinations are more commonly used.




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