The choice of coupling
The choice of coupling required to pass the main consideration of the high and low shaft speed, load size, are connected two parts of the installation of precision, rotational smoothness, price, etc., refer to various types of coupling features, choose a combination of the coupling type. Specific options may wish to consider the following points:
1.1 Because of the manufacturing, installation, set by the deformation and temperature changes and other reasons, when the installation after adjustment, it is difficult to maintain the strict accuracy of the two axes. There is a certain degree of x, Y direction of displacement and deflection angle CI. When the radial displacement is larger, the optional slider coupling, angular displacement of large or intersecting two axes can choose universal coupling, etc. connection. When the working process in the two additional axes have a greater relative displacement, they should use flexible coupling.
1.2 Coupling of the working speed of the centrifugal force caused by the level and the size of. For high-speed shaft should be used in a balanced high precision coupling, such as the diaphragm coupling, etc., but should not use the slider there is eccentric coupling and so on.
l-3 the torque required to pass the buffer size and nature of the vibration functionality. For example, the overloaded power transmission, the choice of gear coupling. A serious impact on the load or require the elimination of the transmission shaft torsional vibration, tire coupling, etc. can be selected.
The vast majority of coupling have been standardized or normalized (see the manual). Designer's task is to choose from, rather than design. The basic steps to use the coupling is as follows:
Choose the type of coupling
According to the size of the load transmission, shaft speed of the high and low, were connected two parts of the installation of precision with reference to various types of coupling features, choose a combination of the coupling type. Specific options may wish to consider the following points:
1) The torque required to pass the size and nature of the damping function of the buffer requirements. For example, the overloaded power transmission, the choice of gear coupling; serious impact load, or calls for the elimination of drive shaft torsional vibration can be selected such as tire type coupling with a high elastic coupling.
2) The coupling of high and low working speed and the centrifugal force caused by the size. For high-speed shaft should be used in a balanced high precision coupling, such as the diaphragm coupling, etc., but should not use the slider there is eccentric coupling and so on.
3) The two-axis size and direction of relative displacement. When the installation is adjusted, it is difficult to maintain the strict accuracy of the two axes, or in the course of work two additional axes will result in a larger relative displacement, they should use flexible coupling. For example, when the radial displacement is larger, the optional slider coupling, angular displacement of large or intersecting two axes can choose universal coupling, etc. connection.
4) The coupling of the reliability and working environment. Is usually made of metal components without lubrication of the coupling of this more reliable; need lubrication coupling, the performance level of vulnerability to the impact of improved lubrication, and may pollute the environment. Non-metallic components containing rubber coupling on the temperature, corrosive media and light and so sensitive and prone to aging.
5) The coupling of the manufacture, installation, maintenance and cost. Be used to meet the performance under the premise of Assembly and Disassembly should be used to facilitate easy maintenance and low cost of the coupling. For example, rigid coupling is not only simple in structure, and the Assembly and Disassembly convenience, can be used for low-speed, rigid big shaft. General non-metallic flexible coupling elements (such as flexible sets of pin coupling, flexible pin coupling, plum-shaped elastic coupling, etc.), as has a good comprehensive ability, widely used in general, small power transmission.