precision planetary reducer nef80 series

Round output flange reducer

Product Description

General Profile

The reducer is a mechanical transmission device in many fields of the national economy. The product categories involved in the industry include various gear reducers, planetary gear reducers and worm reducers, as well as all kinds of special transmission devices, such as speed increasing devices, Speed control device, as well as all kinds of composite transmission, including flexible transmission, etc. Products and services related to metallurgy, non-ferrous metals, coal, building materials, ships, water conservancy, electricity, construction machinery and petrochemical industries.

Reducer Selection
The structural type, installation form, bearing capacity, output speed, working conditions and other factors should be considered in selecting the reducer.

Determination of the reducer specification: the bearing capacity of the reducer is obtained under the condition of rated rotational speed, working less than 12 hours per day, starting less than 10 times per hour, and smoothly and without impact, If the use is different, follow the following steps to select the type.

I. Check the selected configuration
The utilization coefficient is determined according to the type of load, the number of start/stop per hour and the expected working life.
(See table 1: the utilization coefficient table)

1,According to the required torque Ts, the calculated torque is calculated according to the following formula.


2,The required output speed n2 and input speed n1 determin the transmission ratio (i):

3, After determining the Tc and i, according to the reducer rating table, select the most approximate calculation value of the transmission ratio and meet the following conditions of the reducer type:
Tn >= Tc

4, Safety coefficient(S)
Safty factors can be selected as per following table:
(See table 2: the Minimum safety coefficient)

II. Proofreading
After completing the selection of the reducer, the following methods can be used for proofreading.

1, Breakdown torque (Torque maximum)
Confirm that the instantaneous peak load torque and load start torque can not exceed the rated maximum torque (Tmax) of the reducer.(The specific parameter values are listed in the rating table of the reducer.)

2, Cantilever load
Mainly for the case of cantilever rack and pinion, synchronous pulley and so on which need to bear larger radial force or axial force.When selecting, according to a certain speed and force point at the axis extension 1/2, the actual requirement of radial force or axial force is less than the standard value of the sample(Pay attention to the value of the speed of revolution. The lower the rotational speed, the higher the radial force of the bearing will be. The farther the force point is from the shaft shoulder, the lower the radial force will be.)
If you have any special circumstances, you can contact our technicians.

3, If the working life needs to be extended, the life coefficient should be selected in the following tables.
(See table 3: Working Life)

4, Radial load
For the load acting on the middle point of the shaft, the following formula should be used for proofreading.

The Fr here refers to the nominal radial load of the midpoint of the output shaft.
Frj means the radial force is used to calculate the output shaft. If the cantilever load is not at the middle point of the shaft, the offset distance X need to be determined.
Our technicians will calculate the rated load according to the specific working conditions. For different output speeds and working life, velocity coefficient should be considered.
(See table 4: velocity coefficient)

The working life factor (fL) shown in the table of life coefficient must be met following conditions:

5, Axial loading
Calculate the magnitude and direction of the axial load (Fa) on the shaft. Selecting the most suitable reducer is according to the type of output and the direction of axial load and the adjustment factor Ka.
The direction of the axial force is represented by + and -

Fa here refers to the rated axial load of the output shaft. Faj means the axial force of the output shaft.
The axial load factor Ka determined by applied load characteristics is found in the table.
(See table 5:Axial load coefficient)

If there is axial force and radial force at the same time, please contact our technician.


Q1:What's your quality ?
A1:High quality. ISO9001:2008 certificate to ensure quality.

Q2: Can you privide free samples?
A2:Sample is free (except large bearings),Postage should be paid by buyer. But postage can be refund after order is confirmed.

Q3:What's your Brand and service?
A3:We have our own factory in China.
A3:OEM service:we offer any original bearings of famous brand as demands

Q4: What is the Warranty for the bearings?
A4: For the bearings,we have 1 years warranty. If any quality problems on our side occured in this period ,we will take on the shipping cost and replacement.

Q5:Is there cheap shipping cost to import to our country?
A5: For small order,express will be best.And for bulk order,sea ship way is best but take much time.
For urgent orders,we suggest via air to airport plus our ship partner send to your door.

Q6:Can we get support if we have our own market position?
A6: Please inform us your detailed mind on your market demand,we will discuss and propose helpful suggestion for you,to find the best solution for you.