A star coupling is a mechanical component used to connect two shafts (the driving shaft and the driven shaft) in different mechanisms to rotate together and transmit torque. In high-speed and heavy-duty power transmission, some star couplings also have the functions of buffering, vibration reduction, and improving the dynamic performance of the shaft system
The star coupling consists of two halves, which are respectively connected to the driving shaft and the driven shaft. Most power machines are connected to the working machine through a star coupling. Therefore, sometimes during the installation of star type couplings, we also need to pay attention to the deviation that occurs during the connection between the shaft and the shaft. The deviation has a beautiful surface and good performance, and does not require surface treatment such as plating. Instead, it can exert its inherent surface properties and is commonly used in various types of steel, commonly known as stainless steel. High alloy steels such as 13 chromium steel and 18 chromium nickel steel represent performance. From a metallographic perspective, stainless steel contains chromium and forms a very thin chromium film on the surface, which separates it from the oxygen invading the steel
The Correct Selection of Star Couplings
1. The Performance and Working Environment of Star Couplings.
. A star type coupling typically made of metal components that do not require lubrication; The performance of star couplings that require lubrication is easily affected by the degree of lubrication and may contaminate the environment. Star couplings containing non-metallic components such as rubber are sensitive to temperature, corrosive media, and strong light, and are prone to aging2. The size and nature of the torque required to be transmitted, as well as the requirements for buffering and damping functions. For example, for high-power heavy-duty transmissions, tooth type star couplings can be selected; For transmissions with severe impact loads or requiring torsional vibration of the shaft system, star couplings such as tire type star couplings can be selected3. The magnitude and direction of the relative displacement between the two axes. When it is difficult to maintain strict alignment between the two axes after installation and adjustment, or when there will be significant additional relative displacement between the two axes during operation, a flexible star type coupling should be selected4. Manufacturing, installation, maintenance, and cost of star couplings. On the premise of meeting the performance requirements, star couplings that are easy to assemble and disassemble, easy to maintain, and low in cost should be selected5. The working speed and centrifugal force caused by the star coupling. For high-speed transmission shafts, balanced star couplings, such as diaphragm star couplings, should be used instead of eccentric slider star couplings
Connection method of star shaped coupling:
1. Fixed screw type: It is fixed to the shaft with four fixed screws at an angle of 120 ° or 90 °, which is easy to design, has screw indentation on the surface of the shaft, is prone to loosening of screws due to long-term mechanical rotation and impact, saves space, and has a low unit price.
2. Clamping type: There are cut grooves on both sides of the coupling to form an elastic effect, and two or four headed hexagonal screws are inserted on both sides of the clamping shaft; Easy to disassemble, without damaging the axis, with good stability and retentionAll types of couplings come with different standard apertures and can also be machined with keyways. Non sliding, suitable for couplings with an outer diameter of 32 or morePlease note during installation that excessive vibration, abnormal operation, or inaccurate center or excessive deflection angle due to improper combination methods may cause damage to the motor, coupling, and other components
