Serpentine spring coupling

The serpentine spring coupling is a structural metal.It relies on serpentine springs to transmit torque.The serpentine spring coupling is a shaft coupling transmission component in the mechanical field today, and it is also a very common shaft coupling transmission component.

There are nine types of serpentine spring couplings, namely JS housing radial mounting type (basic type), J housing axial mounting type, JSS double flange connection type, JSD single flange connection type, and SJS connection middle Shaft type, JSG high-speed type, JSZ type with brake wheel, JSP type with brake disc, JSA type, etc.

structure

The main structure of the serpentine spring coupling is composed of two half couplings, two half outer covers, two sealing rings and a serpentine spring sheet.It transfers torque by embedding the serpentine spring into the tooth slots of the two coupling halves, and the coupling uses serpentine spring sheets to be embedded in the tooth slots of the two coupling halves to realize the link between the driving shaft and the driven shaft.During operation, the driven end is driven by the axial force of the active end tooth facing the snake spring to transmit torque, which largely avoids the occurrence of resonance phenomenon and the elastic variable generated by the reed when transmitting torque , So that the mechanical system can obtain a better damping effect, with an average damping rate of more than 36%.

How to analyze whether the serpentine spring coupling tooth profile is straight or curved? The serpentine spring coupling uses serpentine springs divided into one or several groups, embedded between the teeth on the flange of the two-part coupling In order to realize the connection of the two halves of the coupling, in order to prevent the serpentine spring from being thrown out under the action of centrifugal force and avoid dry friction between the serpentine spring and the tooth contact, it needs to be covered with a closed shell and filled with Oil or grease.The serpentine spring coupling is divided into two types of transverse stiffness and variable stiffness, which are mainly determined by the following two shapes of the teeth in contact with the spring:

The tooth profile of the serpentine spring coupling is linear: under normal load, the distance between the serpentine spring and the tooth contact point does not change with the deformation of the serpentine spring, and the stiffness remains unchanged. The two halves of the coupling are relative to each other. The rotation angle has a linear relationship with the transmitted torque, which is a constant-rigidity serpentine spring coupling.

The serpentine spring coupling tooth type is curvilinear: when the load is small, the straight part of the serpentine spring is basically parallel to the axis to be connected; when the load increases, the deformation of the serpentine spring increases, and the contact arc surface with the tooth is also Increase, and the distance between the contact point with the tooth becomes shorter and shorter, the stiffness increases, the relative rotation angle of the two halves of the coupling and the transmitted torque are non-linear, which belongs to the variable stiffness serpentine spring coupling.The linear tooth profile is easy to process and low in cost, but it is only suitable for working conditions with small changes in the transmission torque.Curved tooth couplings are suitable for large torque changes and positive and negative working conditions, and have a good cushioning effect, but the curved tooth shape has poor manufacturability and higher manufacturing costs.

application

1. It is suitable for medium and high-power transmission shafts connecting two coaxial lines, with compensation for the relative deviation of the two shafts, vibration reduction, and cushioning performance. The working temperature is -30℃~+150℃, and the nominal torque is transmitted 45. ~800000N.m.

2. Mainly used in rock crusher, crank reciprocating motion, reducer, metallurgy, mining, hoisting machinery, etc.

3. The shaft drive of other various machinery and equipment can be applied wherever there is a motor connected to the shaft, the motor is connected to the reduction box or the shaft is connected to the shaft. [1] 

Features and advantages

特性

1. The coupling is axially embedded in the two halves with a serpentine spring leaf for more than 36%.The serpentine spring leaf of the trapezoidal section is made of spring steel, which has undergone strict heat treatment and processing. It has good mechanical properties, so that the service life of the coupling is much longer than that of the non-metal elastic element coupling (such as elastic sleeve pin , Nylon rod pin coupling) greatly increased.

2. The tooth surfaces of the two half couplings in contact with the reeds are arc-shaped. When the transmission torque increases, the springs will deform along the tooth arcs, so that the force points of the two half couplings on the reeds are close .The contact point between the reed and the tooth surface, that is, the change of torque, changes with the size of the transmitted torque, and its transmission characteristics are variable stiffness.Therefore, it has a load variation that can withstand a general elastic coupling.The cushioning effect produced by the transmission force when the reed deforms along the tooth arc, especially when the machine is started or under impact load, can protect the supporting parts to a certain extent.

3. The transmission efficiency of the coupling has been determined to reach 99.47%, and its short-term overload capacity is twice the rated torque.

4. The aluminum alloy casing protects the spring from being thrown out during operation, and the casing is filled with butter, which not only makes the lubrication good, but also makes the noise when the reed engage is absorbed by the butter damping.

5. The whole machine has few parts, small size and light weight. The spring leaf designed as a trapezoidal cross-section and the trapezoidal tooth groove are particularly convenient and tight, so that the assembly, disassembly and maintenance are easier than ordinary couplings.

6. Since the spring leaf and the tooth arc surface are in point contact, the coupling can obtain greater flexibility.It can be installed to work normally under conditions of radial, angular and axial deviations at the same time.

Hangzhou serpentine spring coupling　Hangzhou serpentine spring coupling