Working principle and use of coupling
The role of the coupling is to connect the water pump shaft and the pump motor shaft to rotate together. Couplings are also called couplings, counter wheels, backrest wheels, and so on. Common couplings include rigid couplings, elastic couplings, gear couplings, hydraulic couplings, and so on.
Working principle and use of coupling
1. Coupling function: used to connect the two shafts together. The two shafts cannot be separated when the machine is running. The two shafts can be separated only after the machine is stopped and the connection is disconnected.
2. The type of coupling: the two shafts connected by the coupling, due to manufacturing and installation errors, deformation afterload, and temperature changes, will cause changes in the relative position of the two shafts, and strict alignment is often not guaranteed. According to whether the coupling has elastic elements, whether it has the ability to compensate for various relative displacements, that is, whether it can maintain the connection function under the condition of relative displacement, and the purpose of the coupling, the coupling can be divided into rigid couplings. Flexible coupling and safety coupling. The main types, characteristics and functions of the coupling are in the transmission system
Role in the system Remarks
Rigid coupling-can only transmit motion and torque, without other functions including flange coupling, sleeve coupling, clamp coupling, etc.
Flexible coupling-a flexible coupling without elastic elements, not only can transmit motion and torque, but also has different degrees of axial, radial, and angular compensation performance, including gear couplings, universal joints Shaft, chain|coupling, slider coupling, etc.
The flexible coupling with elastic elements can transmit motion and torque; it has different degrees of axial, radial and angular compensation performance; it also has different degrees of vibration reduction and buffering, improving the working performance of the transmission system including Various non-metal elastic element flexible couplings and metal elastic element flexible couplings, the structure of various elastic couplings is different, the difference is large, and the role in the transmission system is also different
Safety coupling-transmission of movement and torque, overload safety protection. Flexible safety couplings also have different degrees of compensation performance, including pin type, friction type, magnetic powder type, centrifugal type, hydraulic type, and other safety couplings
A mechanical part used to connect two shafts (driving shaft and driven shaft) in different mechanisms to rotate together to transmit torque. In high-speed and heavy-duty power transmission, some couplings also have the functions of buffering, damping, and improving the dynamic performance of the shafting. The coupling is composed of two halves, which are respectively connected with the driving shaft and the driven shaft. The general power machine is mostly connected with the working machine by means of a coupling. The choice of coupling mainly considers the speed of the required transmission shaft, the size of the load, the installation accuracy of the two parts to be connected, the stability of rotation, the price, etc., refer to the characteristics of various couplings, and choose a suitable one. Coupling type.
The following points can be considered when making specific choices:
1. Due to reasons such as manufacturing, installation, load-deformation, and temperature changes, it is difficult to maintain strict and accurate alignment of the two shafts after installation and adjustment. There is a certain degree of displacement in the x and Y directions and a deflection angle C1. When the radial displacement is large, you can choose a slider coupling, and when the angular displacement is large or the connection of two intersecting shafts, you can choose a universal coupling. When the two shafts produce a large additional relative displacement during the working process, a flexible coupling should be used.
2. The working speed of the coupling and the centrifugal force caused by it. For high-speed drive shafts, couplings with high balance accuracy, such as diaphragm couplings, should be used instead of eccentric slider couplings.
3. The size and nature of the torque to be transmitted and the requirements for the function of damping vibration. For example, for high-power and heavy-duty transmission, gear couplings can be used. For severe impact loads or transmissions that require the elimination of shaft torsional vibration, tire couplings can be used.
Most couplings have been standardized or standardized. The designer's task is to choose, not design. The basic steps for selecting a coupling are as follows:
Select the type of coupling
According to the size of the transmitted load, the speed of the shaft, the installation accuracy of the two parts to be connected, etc., refer to the characteristics of various couplings and select a suitable coupling type. The following points can be considered when making specific choices:
1) The size and nature of the torque to be transmitted and the requirements for the buffer and vibration reduction function. For example, for high-power and heavy-duty transmissions, gear couplings can be used; for transmissions that require severe impact loads or to eliminate shaft torsional vibration, tire couplings and other couplings with high elasticity can be selected.
2) The working speed of the coupling and the centrifugal force caused by it. For high-speed drive shafts, couplings with high balance accuracy, such as diaphragm couplings, should be used instead of eccentric slider couplings.
3) 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 shafts after installation and adjustment, or when the two shafts will have a large additional relative displacement during the working process, a flexible coupling should be used. For example, when the radial displacement is large, you can choose a slider coupling, and when the angular displacement is large or the connection of two intersecting shafts, you can choose a universal coupling.
4) The reliability and working environment of the coupling. Generally, couplings made of metal elements that do not require lubrication are more reliable; couplings that require lubrication are easily affected by the degree of lubrication and may pollute the environment.
Couplings containing non-metallic components such as rubber are more sensitive to temperature, corrosive media, and strong light, and are prone to aging.
5) Manufacturing, installation, maintenance, and cost of the coupling. Under the premise of meeting the convenience of use, couplings that are convenient for assembly and disassembly, simple maintenance, and low cost should be selected. For example, the rigid coupling is 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-shaped elastic couplings, etc.), due to their good comprehensive capabilities, are widely used in general medium and small power transmission.
Do you have any specific questions about the design or manufacture of Couplings? Contact Yogie! Our sales engineers will work with you from start to finish to ensure that your project is completed to your requirements.
Also, Yogie is a professional manufacturer for mining equipment, CNC Machine tools, and machinery parts for over 20years.
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