About the type and selection of universal shaft

The coupling selection mainly considers the speed of the shaft to be transferred, the size of the load, the installation accuracy of the two parts to be connected, the smoothness of the rotation, the price, etc., and selects a suitable coupling type by referring to the characteristics of various types of couplings.

About the selection of universal shaft.
The selection of universal shaft mainly considers the speed of the shaft to be transmitted, the size of the load, the installation accuracy of the two parts to be connected, the smoothness of rotation, the price, etc., and selects a suitable coupling type by referring to the characteristics of various types of couplings. The following points can be considered for specific selection.

1. Due to manufacturing, installation, load deformation and temperature changes, it is difficult to keep the two axes strictly and precisely aligned after installation and adjustment. There is a certain degree of x, Y direction displacement and skew angle CI. when the radial displacement is larger, you can choose the slider coupling, angular displacement is larger or intersecting two axis coupling can choose universal shaft, etc.. When the work process of the two axes produce a large additional relative displacement, should be selected flexural coupling.

2. The working speed of the coupling is high or low and the size of the centrifugal force caused. For high-speed transmission shaft, the coupling with high balance accuracy should be used, such as diaphragm coupling, etc., and the eccentric slider coupling should not be used.

3. The size and nature of the torque to be transmitted and the requirements of the buffer vibration function. For example, for high-power heavy-duty transmission, the tooth coupling can be used. For severe shock load or the requirement to eliminate the transmission of shaft system torsional vibration, tire type couplings can be used. The vast majority of couplings have been standardized or standardized. The designer's task is to select, not design. The basic steps in selecting a coupling are as follows.

Selecting the type of coupling
According to the size of the transferred load, the shaft speed, the installation accuracy of the two parts to be coupled, etc., refer to the characteristics of various types of couplings and select a suitable coupling type. The following points can be considered for specific selection.

1) The size and nature of the torque to be transmitted and the requirements for the cushioning and vibration reduction function. For example, for high-power heavy-duty transmission, the tooth coupling can be used; for severe shock load or the requirement to eliminate the transmission of shaft torsional vibration, the tire coupling and other couplings with high elasticity can be used.

2) Universal shaft working speed and the size of the centrifugal force caused by the high and low. For high-speed drive shaft, the coupling with high balance accuracy should be used, such as diaphragm coupling, etc., and the eccentric slider coupling should not be used.

3) The size and direction of the relative displacement of the two shafts. When the installation and adjustment, it is difficult to maintain the strict and accurate alignment of the two shafts, or the work process will produce a large additional relative displacement of the two shafts, the flexible coupling should be used. For example, when the radial displacement is higher.

4) The reliability of the universal shaft and the working environment. Usually made of metal components do not need lubrication coupling this more reliable; need lubrication coupling, its performance is vulnerable to the degree of lubrication, and may pollute the environment. Couplings containing rubber and other non-metallic components are sensitive to temperature, corrosive media and bright light, and are prone to aging.

5) Manufacturing, installation, maintenance and cost of couplings. Under the premise of meeting the convenient performance, the coupling should be selected for easy installation and disassembly, simple maintenance and low cost. For example, rigid couplings are not only simple in structure, but also easy to install and disassemble, and can be used for low speed, rigid drive shaft. General non-metallic elastic element couplings (such as elastic sleeve column pin coupling, elastic column pin coupling, plum-shaped elastic coupling, etc.) are widely used in general medium and small power transmission because of their good comprehensive ability.