Serpentine spring coupling

model

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

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 high-quality spring steel, subjected to strict heat treatment and special 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). Column pins, nylon rod pin couplings) have greatly increased.

2. The tooth surfaces of the two half couplings in contact with the reeds are curved. When the transmission torque increases, the springs will deform along the curved surfaces of the teeth, 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 greater load variation than general elastic couplings.The cushioning effect produced by the transmission force when the reed deforms along the tooth arc, especially when the machine is started or strong impact load, to a certain extent, protects the safety of the supporting parts.

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

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 reeds engage is absorbed by the butter damping and eliminated.

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.

advantage

1. Good vibration damping and long service life.

2. Large range of bearing variable load and safe starting.

3. High transmission efficiency and reliable operation.

4. Low noise and good lubrication.

5. Simple structure and convenient assembly and disassembly.

6. The whole machine has few parts, small size and light weight.

7. Large installation deviation is allowed.

application

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

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

3. The shaft transmission of other kinds of machinery and equipment can be applied wherever a motor is connected to the staff, the motor is connected to the reduction box or the shaft is connected to the shaft.

How to install and use

1 Carefully align the installation and control reasonable deviation

Although the JSZ serpentine spring coupling with brake wheel allows a large installation deviation, it should also be within the specified value during installation

(1) Align the gap and angular deviation between the two-part couplings. When installing, measure the gap between the two-part Lingsi serpentine spring couplings every 90°, and the difference between the maximum value and the minimum value is not More than 0.38mm.

(2) Correction of radial deviation.Put a ruler on the two-part coupling, measure it every 90°, and check with a ruler, the radial deviation does not exceed 0.38mm.

2 Choose suitable grease

The temperature of the oil injection point is ≥150℃, which can resist centrifugal force, has separation stability, no impurities, and does not corrode carbon steel and nitrile rubber lithium-based grease.

3 Fill enough grease

Adequate grease is very important for the work of the serpentine spring coupling. It is recommended to check once a year.Use a dry grease gun to inject grease until there is excess grease overflow in the hole.

Tooth shape is straight and curved

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.