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The function and fixing method of elastic coupling

Publication time: November 2016, 03【L Small

  Elastic coupling is a widely used elastic coupling, also called claw-type elastic coupling, which is composed of two metal claw discs and an elastic body.The two metal claws are generally made of No. 45 steel, but aluminum alloys are also useful when load sensitivity is required.

  Due to the impossibility of manufacturing and installing the elastic coupling, as well as the elastic deformation and temperature difference deformation of the foundation, frame and other components when the work is loaded, the two axes connected by the elastic coupling will inevitably have a relative offset servo motor .The possible relative deviations of the two coupled shafts of the elastic coupling include: axial deviation, radial deviation and angular deviation, as well as the combined deviation of the three types of deviations.

  The occurrence of the relative deviation of the two shafts of the elastic coupling will cause additional loads on the shafts, bearings and the elastic coupling, and even severe vibration.Therefore, the elastic coupling should also have a certain ability to compensate for the deviation of the two shafts to eliminate or reduce the additional load caused by the relative deviation of the two shafts, improve the transmission performance, and extend the life of the machine.In order to reduce the vibration of the mechanical transmission system and reduce the impact peak load, the elastic coupling should also have a certain cushioning and shock absorption performance.

  How to fix the elastic coupling

  1. Fixing by positioning screws: The gap between the two positioning screws is 90° to lock the shaft of the fixed coupling. In the traditional fixing method, because the front end of the screw contacts the shaft, it may cause damage to the shaft or difficulty in disassembly. .

  2. Clamping screw fixation: Utilize the tightening force of the hexagon socket bolt to shrink the slit and clamp the shaft tightly.This method is convenient to fix and disassemble, and will not cause damage to the shaft, so it is a very common fixing method.

  3. Keyway type fixation: suitable for high-torque transmission. In order to prevent axial sliding, it is usually used together with positioning screws and clamping screws.

  4. D-shaped hole fixing: Normally, if the shaft of the motor is D-shaped, if the positioning screw cannot be fixed, the hole of the coupling can be processed into a corresponding D-shaped hole and fixed with the positioning screw. Worried about slipping.

  5. Expansion sleeve fixation: The tent is compressed and fixed by tightening the four positioning screws on the end of the coupling. It is suitable for the connection and fixation of some stepping motors and servo motors with large torque, such as expansion sleeve diaphragm couplings. , Expansion sleeve plum coupling, expansion sleeve bellows coupling, etc.

Keywords of this article:Flexible coupling | Coupling |