The main structure of the serpentine spring coupling

Published: 2021-04-01

When installing the serpentine spring coupling, you only need to use standard mechanical tools, such as: wrenches, straightedges, and probe gauges.Couplings with specifications from 1020 to 1090 are usually installed with gaps and fixed with fixing screws perpendicular to the keyway; couplings with specifications of 1100 or larger are interference fit, without fixing screws, and need to be hot-fitted.

When installing a coupling with a clearance fit, you need to clean all relevant parts and check whether there are burrs on the hub, shaft, and keyway. Do not heat the hub with a clearance fit.When installing the hub, its end surface should be flush with the shaft end, or install in accordance with other specified requirements, and tighten the fixing screws.

When installing an interference fit coupling, there is no fixing screw.Use ovens, blowtorches, induction heaters or oil baths to heat the hub. If the temperature reaches 135°C and exceeds 200°C, the seals will be damaged.When heating the hub hole directly, it is necessary to maintain a constant movement to avoid overheating a certain area.

It is worth noting that before installing or maintaining the coupling, turn off the start switch and remove the load from the drive device.If the oil pool is used for heating, the flash point of the oil must be higher than 177°C. The hub must not be placed directly at the bottom of the container. An iron block must be placed at the bottom. Open flames must not be used in a flammable environment or near flammable materials.

Serpentine spring couplingThe main structure is composed of two half couplings, two half outer covers, two sealing rings and a serpentine spring leaf.It is sent by a serpentine spring embedded in the time slot of the two coupling halves, and the coupling is inserted into the slot of the two coupling halves. The serpentine spring is used to realize the connection between the drive shaft and the driven shaft. contact.

1. The proportion of the coupling embedded in the two halves in the axial direction of the serpentine spring is more than 36%.The trapezoidal section of the serpentine spring leaf is made of high-quality spring steel, subjected to strict heat treatment and special treatment, and has good mechanical properties, so that the service life of the coupling is much longer than that of non-metallic elastic component coupling.

2. Two half couplings, the tooth surfaces of which are in contact with the reed are curved.When the transmission torque increases, the spring leaf will deform along the tooth surface, so that the force points of the two half couplings acting on the reed leaf will approach.The contact point between the reed and the tooth surface, that is, the change of torque, changes with the magnitude of the transmitted torque, and its transmission characteristic is a variable stiffness.Therefore, it can withstand larger load changes than ordinary elastic coupling.The transmission force makes the cushion effect produced when the reed deforms along the tooth arc, especially when the machine is started, or when the impact load is strong, to a certain extent, the support mechanism is protected.

3. The aluminum alloy cover protects the spring when it is running, and the shell is filled with cream, which not only makes the lubrication good, but also eliminates the noise when the reed is joined by the damping of the butter.

4. The transmission efficiency of the coupling is 99.47%, and the short-term overload capacity is twice the rated torque, which is reliable.

5. The whole machine has few parts, small size and light weight.The spring leaf designed with a trapezoidal cross-section is particularly convenient and tight to match the trapezoidal tooth groove, making assembly, disassembly and maintenance easier than general couplings.

6. Since the spring sheet is in point contact with the toothed arc surface, the coupling can be more flexible.It can be installed to work normally under radial, angular and axial deviations.

During operation, the movable end tooth faces the axial force of the snake spring to drive the driven end to transmit torque, thereby largely avoiding the resonance phenomenon and the elastic variable generated by the reed when the torque is transmitted.In order to obtain a better damping effect of the mechanical system, the average damping rate is above 36%.