In practical applications, couplings can be divided into heavy, medium, small and light according to the size of the transmitted torque. So how to choose a suitable coupling and what precautions should be taken when using it?
1. After installation and adjustment, it is difficult to maintain strict and precise alignment of the two axes.
Due to reasons such as manufacturing, installation, load deformation and temperature changes, it is difficult to maintain strict and precise alignment of the two axes after installation and adjustment.
There is a certain degree of displacement in the X and Y directions and the deflection angle CI. When the radial displacement is large, a sliding block coupling can be selected. When the angular displacement is large or the connection of two intersecting axes, a universal coupling can be used. When a large additional relative displacement occurs between the two axes during work, a flexible coupling should be used.
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Universal coupling
2. The working speed of the coupling and the centrifugal force caused by it
For high-speed transmission shafts, couplings with high balance accuracy, such as diaphragm couplings, etc., should be used instead of eccentric slider couplings, etc.
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Cross slide coupling
3. The magnitude and nature of the torque to be transmitted and the requirements for buffering and vibration damping functions
For example, for high-power and heavy-duty transmissions, gear couplings can be used; for transmissions with severe impact loads or that require the elimination of torsional vibration of the shaft system, highly elastic couplings such as tire couplings can be used.
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Helical gear coupling
4. The working speed of the coupling and the centrifugal force caused by it
For high-speed transmission shafts, couplings with high balance accuracy, such as diaphragm couplings, etc., should be used instead of eccentric slider couplings, etc.
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Diaphragm coupling
5. The magnitude and direction of the relative displacement of the two axes
When it is difficult to maintain strict and precise alignment of the two axes after installation and adjustment, or when the two axes will produce large additional relative displacements during work, a flexible coupling should be used. For example, when the radial displacement is large, a sliding block coupling can be selected, and when the angular displacement is large or the connection of two intersecting axes, a universal coupling can be used.
6. Coupling reliability and working environment
Couplings that do not require lubrication and are usually made of metal components are more reliable; couplings that require lubrication have their performance easily affected by the degree of lubrication and may pollute the environment. Couplings containing non-metallic components such as rubber are sensitive to temperature, corrosive media and strong light, and are prone to aging.
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Slide coupling
7. Manufacturing, installation, maintenance and cost of couplings
On the premise of meeting the convenience performance, a coupling that is easy to assemble and disassemble, simple to maintain, and low in cost should be selected. For example, rigid couplings are not only simple in structure, but also easy to assemble and disassemble, and can be used for low-speed, high-rigidity drive shafts. General non-metallic elastic element couplings (such as elastic sleeve pin couplings, elastic pin couplings, plum blossom-shaped elastic couplings, etc.), due to their good comprehensive capabilities, are widely used in general medium and small Power transmission.
