A snake spring coupling is a type of advanced-structured metal elastic coupling. Here is a detailed English introduction:
Structure
It mainly consists of two half-couplings, two half-outer covers, two sealing rings, and snake spring plates. The snake spring plates are embedded in the tooth grooves of the two half-couplings to achieve the connection between the driving shaft and the driven shaft. The two half-outer covers and sealing rings are used to protect the snake spring plates and prevent lubricating oil from leaking.
Working Principle
When in operation, the axial force of the tooth surface of the driving end on the snake spring drives the driven end to transmit torque. The elastic deformation generated by the spring plates during torque transmission enables the mechanical system to obtain a good vibration reduction effect, with an average vibration reduction rate of over 36%.
Types
There are nine types of snake spring couplings, namely JS type (radial installation type of the casing, basic type), JSB type (axial installation type of the casing), JSS type (double-flange connection type), JSD type (single-flange connection type), SJS type (with intermediate shaft type), JSG type (high-speed type), JSZ type (with brake wheel type), JSP type (with brake disc type), and JSA type (safety type).
Performance Advantages
Good vibration reduction and long service life: The snake spring plates are made of high-strength spring steel such as 60Si2Mn, which are cold-rolled into shape and then heat-treated. They have high elastic limits and fatigue resistance. The unique structure can avoid resonance to a large extent and has a much longer service life than non-metallic elastic element couplings.
Large range of variable load bearing and safe starting: The tooth surface of the half-coupling in contact with the spring plates is arc-shaped. When the transmitted torque increases, the spring plates deform along the tooth arc surface, and the force points of the two half-couplings on the spring plates approach. Its transmission characteristic is variable stiffness, so it can bear a larger load variation.
High transmission efficiency and reliable operation: The transmission efficiency can reach 99.47%, and the short-term overload capacity is twice the rated torque.
Low noise and good lubrication: The aluminum alloy casing can prevent the spring from being thrown out during operation, and the casing is filled with butter, which not only makes the lubrication good but also eliminates the noise generated when the spring plates mesh.
Simple structure, convenient assembly and disassembly: The whole machine has few parts, small volume, and light weight. The trapezoidal cross-section spring plates are very convenient and tight to fit with the trapezoidal tooth grooves, making the assembly, disassembly, and maintenance simpler than ordinary couplings.
Allowing large installation deviations: It can work normally when there are radial, angular, and axial deviations at the same time. The allowable relative radial displacement between the two half-shafts is between 0.5mm and 3mm, the axial displacement is between 4mm and 20mm, and the angular displacement is 1°15′.
