Technical Articles

Gear Transmission Design Steps

Posted: 2014-02-27 03:12:11  Hits: 1110
1. The original information and data for design 
◆ Prime mover types, size, revolving speed, power (torque), starting characteristic, short-term overload capacity, rotational inertia etc.   
Machinery type, size, application, revolving speed, and power (torque). Working system: Permanent load or changing load, changing load diagram; Starting, braking and short-term overload torque, start frequency; Shock and vibration; Direction of rotation etc.   
◆ The connecting mode of prime mover, working machine and reducer. Whether the shaft extension has radial force and axial force. 
◆ Installation form: relative position, vertical type, or horizontal type of reducer, prime mover, and working machine).
◆ Drive ratio and allowable error. 
◆ Requirements for size and weight.   
◆ Requirements for service life, safety and reliability. 
◆ Environment condition such as temperature, dust concentration, air velocity, and PH value; Lubrication and cooling condition (circulating water and lubricating station existing or not) and restrictions for vibration and noise. 
◆ Requirements for operation and control. 
◆ Material, blank, standard component and stock.
◆ Factory manufacturing capabilities.       
◆ Requirements for batch, costs and prices.    
◆ Delivery term.   
Above first four items are necessary conditions. Other aspects can be designed according to normal proportional, a 10-year working life for example. For important occasions, reliability should be of a higher level.  
2. Determine the rated power of reducer   
The rated power of reducer refers to the mechanical power determined by all the static and the most vulnerable parts in the box.   
3. Determine the type and installation form of reducer.
4. Initially determine performance level, material of gears and critical parts, heat treatment, finish machining method, lubrication method and lubrication oil. 
5. Determine the transmission series and various transmission ratios according to total transmission ratio.    
6. Calculate transmission center distance (or pitch circle diameter), module and other geometric parameters of gear preliminary.      
7. Determine the structure of reducer, the dimension, span and bearing type of shaft through the whole project design. 
8. Check the strength of gear, shaft, key etc, and calculate the bearing service life.  
9. Lubrication cooling calculation.
10. Determine the attachment of reducer.   
11. Determine the carburized depth of gears, and calculate the process data of tooth form and tooth modification if necessary. 
12. Design the drawings. Implement national and industry standards in designs.

Miss Lavendie Lee 
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