Views:0 Author:Site Editor Publish Time: 2021-02-10 Origin:Site
A shaft coupling is a device used to join two pieces of rotating equipment or shaft for the purpose of transmitting power from one shaft to another shaft. Here, shaft couplings have many types with different specifications as well as functions. You may wonder how many types of shaft couplings are there and how can we choose a suitable shaft coupling.
How many types of shaft couplings are there?
What are the functions of shaft couplings?
How to choose a right shaft coupling?
Shaft couplings can be divided into two categories: rigid couplings and flexible couplings.
Rigid couplings do not have the ability to buffer and the ability to compensate for the relative displacement of the two axes, which requires strict alignment of the two axes. However, rigid coupling has simple structure, low manufacturing cost, convenient assembly and disassembly and maintenance, and can ensure that the two axes have the neutrality of the transmission is greater. Rigid couplings can be used in flange couplings, sleeve couplings and clamp couplings. m
Flexible couplings can be further divided into flexible couplings without elastic elements and flexible couplings with elastic elements. The former type only has the ability to compensate the relative displacement of the two axes, but it cannot buffer and dampen vibrations, which is commonly used in slider couplings, gear couplings, universal couplings and chain couplings. Because the latter type contains elastic elements, in addition to the ability to compensate for the relative displacement of the two axes, flexible couplings with elastic elements also has the ability of buffering and dampening. However, it is worse than the flexible coupling without elastic elements for the torque is limited by the strength of the flexible element. Flexible couplings with elastic elements commonly are the part of elastic sleeve pin couplings, elastic pin couplings, plum-shaped couplings, tire couplings, serpentine spring couplings and reed couplings.
The functions of shaft couplings can be described as follows:
Shaft couplings have the ability of buffering, dampening, and improving the dynamic performance of the shaft system. Shaft coupling refers to a device that connects two shafts or shafts and rotating parts, and rotates together in the process of transmitting movement and power, and does not disengage under normal conditions. Sometimes shaft coupling is also used as a safety device to prevent the connected parts from being subjected to excessive loads and play a role in overload protection.
Shaft coupling is often composed of two halves, which are connected by a key or tight fit respectively, and fastened to the ends of the two shafts, and then the two halves are connected in some way. The shaft coupling can also compensate the deviation between the two shafts due to inaccurate manufacturing and installation and deformation or thermal expansion during work.
According to the size of the transferred load, the speed of the shaft, and the installation accuracy of the two parts to be connected, choose a suitable shaft coupling, together with referring to the characteristics of various couplings. The following points can be considered when selecting:
The size and nature of the torque to be transmitted and the requirements for the cushioning function. For example, for high-power and heavy-duty transmissions, gear couplings can be selected. For transmissions that require severe impact loads or to eliminate shaft torsional vibration, tire couplings and other couplings with high elasticity can be selected.
The working speed of the shaft coupling and the centrifugal force. For high-speed transmission shafts, shaft couplings with high balance accuracy, such as diaphragm couplings should be selected, rather than slider couplings which has eccentricity.
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, the slider coupling can be used. The universal coupling can be used for the connection of large angular displacement or intersecting two shafts.
The reliability and working environment of the shaft coupling. Shaft coupling usually made of metal elements that do not require lubrication are more reliable. The performance of shaft coupling is easily affected by the perfect degree of lubrication and may pollute the environment. Shaft coupling containing non-metallic components such as rubber are sensitive to temperature, corrosive media and strong light, and are prone to aging. The surrounding working environment of shaft coupling is more complicated. Temperature, humidity, water, steam, dust, sand, oil, acid, alkali, corrosive media, salt water, and radiation are all should be taken into consideration when choosing a shaft coupling. For the working quality of high or low temperature, oil, acid and alkali medium, it is not suitable to choose the flexible coupling with the general rubber as the elastic element material.
The manufacturing, installation, maintenance and cost of the shaft coupling. Under the premise of meeting the convenience performance, shaft coupling that are easy to install and unload, simple to maintain, and low-cost should be selected. For example, the rigid coupling has simple structure and convenient assembly and disassembly, and can be used for low-speed, high-rigidity drive shafts. General non-metal element couplings are widely used in general medium and small power transmissions due to their good comprehensive capabilities.
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