1. Choose standard couplings. Designers should first choose couplings that have been established as national standards, mechanical industry standards, and have obtained national patents. Only when existing standard couplings and patented couplings cannot meet design needs, do designers need to design couplings themselves.
2. Choose the type of couplingtype
Understand the comprehensive functions of couplings (especially flexible couplings) in the transmission system, consider the overall design of the transmission system, and select the type of couplingtypeSelect the type of coupling based on comprehensive factors such as the type of prime mover and working load, working speed, transmission accuracy, two axis offset condition, temperature, humidity, and working environment. Choose the structure of the coupling according to the needs of the supporting hosttypeWhen the coupling is used in conjunction with the brake, it is advisable to choose a brake wheel or brake disctypeThe coupling; When overload protection is required, it is advisable to choose a safety coupling; When connecting with flanges, it is advisable to choose flange type; For long-distance transmission, when the axial dimension of the connection is large, it is advisable to choose the intermediate shaft type or the intermediate sleeve type.
3. Coupling torque calculation
The power of the power machine in the transmission system should be greater than the required power of the workpiece machine. The theoretical short moment T of the high-speed end connected to the power machine can be calculated based on its power and speed; According to the working condition coefficient K and other relevant coefficients, the calculated torque Tc of the coupling can be calculated,. The coupling T is inversely proportional to n, so the low-speed end T is greater than the high-speed end T.
4. Preliminary selection of couplingmodel
According to the calculated torque Tc, a nominal torque Tn with phase approximation can be selected from the standard series, and Tn ≥ Tc should be met when selecting. Preliminary selection of couplingmodel(Specification), the allowable speed [n], maximum radial dimension D, and axial dimension L0 of the coupling can be obtained from the standard, which satisfies the coupling speed n ≤ [n].
5. Adjust according to the shaft diametermodel
The preliminarily selected coupling connection size, namely the shaft hole diameter d and shaft hole length L, should meet the requirements of the main and driven end shaft diameters, otherwise the coupling specifications need to be adjusted according to the shaft diameter d. It is a common phenomenon that the shaft diameters of the main and driven ends are not the same. When the torque and speed are the same, but the shaft diameters of the main and driven ends are not the same, the coupling should be selected according to the larger shaft diametermodelIn the newly designed transmission system, seven types of shaft holes that comply with the provisions of GB/T3852 should be selectedtypeRecommend using J1 type shaft holetypeTo improve universality and interchangeability, the length of the shaft hole shall be in accordance with the specifications of the coupling product standard. 6. Select Connectiontype
Coupling connectiontypeThe choice depends on the connection between the main and driven ends and the shafttypeGenerally, key connections are used for unified key connectionstypeSeven types of keyways are specified in GB/T3852, along with their codestypeAmong the four types of keyless connections, the most commonly used is the A-type key.
7. Select the type, style, and specification of the coupling（model）
Select the type of coupling based on comprehensive factors such as the load category, speed, and working environment of the power machine and coupling; Select the coupling based on factors such as the matching and connection of the couplingtypeSelect specifications based on nominal torque, shaft hole diameter, and shaft hole length（model）. To ensure the strength of the shaft and key, when selecting the couplingmodelAfter the specification, the strength of the shaft and key should be verified and calculated to finally determine the couplingmodel.