Introduction and type of coupling
Coupling refers to a device that connects two shafts or shafts and rotating parts, and rotates together in the process of transmitting motion and power, and does not disengage under normal circumstances. Sometimes, it is also used as a safety device to prevent the connected parts from being subjected to excessive loads, and plays the role of overload protection.
Mechanical components used to firmly connect the drive shaft and driven shaft in different mechanisms to rotate together and transmit motion and torque. Sometimes used to connect the shaft and other parts (such as gears, pulleys, etc.). It is often composed of two halves, which are connected by keys or tight fits, etc., fastened to the two shaft ends, and then the two halves are connected by some way. The coupling can also compensate for the deviation between the two shafts due to inaccuracies in manufacturing and installation, deformation or thermal expansion during operation (including axial offset, radial offset, angular offset or comprehensive offset) ; And to mitigate shocks and absorb vibration. [1]
Most of the commonly used couplings have been standardized or standardized. In general, it is only necessary to correctly select the type of coupling and determine the type and size of the coupling. When necessary, the weak parts of the load can be checked for load capacity; when the speed is high, the centrifugal force of the outer edge and the deformation of the elastic element need to be checked and the balance checked.
Types of Couplings
Couplings can be divided into two categories: rigid couplings and flexible couplings.
Rigid couplings do not have cushioning and the ability to compensate for the relative displacement of the two axes. The two shafts are required to be strictly aligned, but this type of coupling has a simple structure, low manufacturing cost, and assembly and disassembly. 2. Convenient maintenance, can ensure high alignment of the two shafts, large transmission torque and wide application. Commonly used are flange coupling, sleeve coupling and clamp coupling.
Flexible couplings can be divided into flexible couplings without elastic elements and flexible couplings with elastic elements. The former type only has the ability to compensate for the relative displacement of the two axes, but it cannot buffer the vibration. Block couplings, toothed couplings, universal couplings and chain couplings, etc.; the latter category contains elastic elements, in addition to the ability to compensate for the relative displacement of the two axes, it also has buffering and vibration reduction effects. However, due to the limitation of the strength of the elastic element, the transmitted torque is generally not as good as the flexible coupling without the elastic element. The common ones are the elastic sleeve pin coupling, the elastic pin coupling, the plum blossom coupling, and the tire type. Couplings, serpentine spring couplings, reed couplings, etc.
Performance requirements
According to different working conditions, the coupling must have the following performance:
(1) Removability. The movability of the coupling refers to the ability to compensate for the relative displacement of the two rotating components. Factors such as manufacturing and installation errors between connected members, temperature changes during operation, and deformation under load all put forward requirements for mobility. Removable performance compensates or alleviates additional loads between shafts, bearings, couplings, and other parts caused by relative displacement between rotating components.
(2) Buffering. For occasions where the load is starting frequently or the working load changes, the coupling needs to have elastic elements that play a role in buffering and damping to protect the prime mover and the working machine from damage or damage.
(3) Safe and reliable, with sufficient strength and service life.
(4) The structure is simple, easy to assemble and disassemble, and maintain.
select
Coupling type selection When selecting the coupling type, the following items should be considered.
① The size and nature of the required transmission torque, the requirements for buffering and vibration reduction functions, and whether resonance may occur.
②The relative displacement degree of the two shaft axes due to manufacturing and assembly errors, shaft loading and thermal expansion deformation, and relative motion between components.
③ The allowable external dimensions and installation methods are the operation space necessary for easy assembly, adjustment and maintenance. For large couplings, it should be possible to disassemble and assemble the shaft without axial movement.
In addition, the working environment, service life, and lubrication, sealing, and economic conditions should also be considered, and then refer to the characteristics of various couplings to choose a suitable coupling type.
Luoyang Yujie Industry &Trade Co.Ltd located in the Luoyang City , one of the main heavy industrial bases in China. We specialize in the production of bearings , non standard machinery parts, machine tools.For the bearings, we can offer cross roller bearing , slewing bearing, YRT bearing,thin section bearing , ball screw bearing , deep groove ball bearing ,ect. For the non standard machine parts, we can produce gears, shafts, sprockets, moulds, rollers, pulley, mining machine parts, ect as per customer drawing and requirements.For the machine tools, we offer CNC vertical machine center, CNC horizontal lathe, CNC gantry boring and milling machine , CNC floor type boring and milling machine.
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