Coupling Selection

Design staff in the selection of couplings should first be developed for the national scale, mechanical industry scale and national patented couplings to choose, only when the existing scale couplings and patented couplings can not meet the design needs of their own design couplings. 

2, select coupling varieties, type Understand the comprehensive function of couplings (especially flexible couplings) in the transmission system, and choose coupling varieties and patterns from the overall design of the drive system. According to the original idea and the work load type, working speed, transmission accuracy, two-axis offset condition, temperature, humidity, working environment and other comprehensive factors to select the variety of coupling. According to the needs of the supporting host to choose the structure of the coupling type, when the coupling and brake supporting the use, it is advisable to choose a brake wheel or brake disc type coupling; 

It is advisable to choose either a connecting intermediate shaft type or a middle sleeve. 

3, coupling torque calculation The power of the power train in the transmission system should be greater than the required power of the workpiece. According to the power and speed of the power and speed of the power of the power machine, the high-speed true theoretical short moment T connected to the power machine can be calculated, and the calculated torque Tc of the coupling can be calculated according to the operating condition coefficient K and other related coefficients. 

Coupling T is inversely proportional to n, so the low-speed end T is larger than the high-speed end T. 

4, the primary coupling model According to the calculation of torque Tc, the nominal torque Tn, which is similar to the size series, can be selected, and the selection should be satisfied with Tn.Tc. 

Preliminary selection of coupling model (specification), from the scale can be found coupling of the xu speed of the coupling , n , and the maximum radial dimensions D, axial dimensions L0, it is known that the FFA axial speed n . 

5, according to the shaft diameter adjustment model The initially selected coupling joint dimensions, i.e. shaft hole diameter d and shaft hole length L, should meet the requirements of the main and driven end shaft diameters, otherwise the specifications of the coupling should be adjusted according to the shaft diameter d. It is common for the main and driven shaft diameters to be different, when the torque and speed are the same, and the main and driven shaft diameters are not the same, the coupling model should be selected according to the large shaft diameter. 

In the newly designed transmission system, the seven types of shaft hole type in line with GB/T3852 should be selected, and J1-type shaft hole type is recommended to improve versatility and interchangeability, and the shaft hole length is delineated according to the coupling product scale. 

6, choose join type 

The choice of coupling join type depends on the main, driven end on the axis of the join type, generally using key join, for the same key join type and code, in GB/ T3852 delineated seven keys type, four no key join, with more a type A key. 

7, selected coupling varieties, types, specifications (models) According to the combined factors such as the load type of the power machine and the coupling, speed, working environment and so on, the coupling variety is selected, the coupling type is selected according to the supporting and joining conditions of the coupling, and the specification (model) is selected according to the nominal torque, shaft hole diameter and shaft hole length. In order to ensure the strength of the shaft and key, after selecting the coupling model (specification), the shaft and key strength should be verified to finalize the model of the coupling.