Views:0 Author:Site Editor Publish Time: 2021-05-01 Origin:Site
Flexible coupling is one type of shaft couplings, which is parallel with rigid coupling. However, flexible couplings contain other types of coupling which are suitable for different machines. It is really confused for user who want to buy a suitable shaft coupling with no comprehensive knowledge about the shaft coupling.
How many types of flexible couplings are there?
What is related to the lifespan of flexible coupling?
How to choose flexible coupling?
Gear Couplings are usually torsional rigid couplings. These can transmit the highest amount of torque from one end to the other end. These gear couplings can be designed in a completely flexible model where it can accommodate the parallel misalignment. In a complete flexible gear coupling model, both sides of the gear coupling come with a sleeve and hub with external gear tooth, which will provide a double flexible engagement for all three misalignments.
Old-ham coupling usually provides a huge amount of parallel misalignment. It consists of three members. There is a floating member trapped in between the other two members by means of 90° grooves on both sides of the floating member.
The disc coupling is having a thin sheet of discs laminated as the main part of the coupling for the flexibility to accommodate the misalignments. It consists of two hubs on each side and a spacer at the middle joined by the discs on both sides.
Universal joint is well known to us. It is a linkage consisting of two yokes connected by a spider. Universal joint can accommodate massive angular misalignments, which is mainly used for the lengthy shaft linings supported by bearings.
Bushed pin type coupling is a simple type of coupling with two flanges bolted with the help bolt and nut covered by bush made up of rubber. These couplings are torsional rigid and also accommodate all three misalignments. Because of its simple design, these are less expensive.
Torsional couplings are mostly to accommodate the torsional vibration. Most of these are rubber coupling where it can dampen the vibrations and also accommodate the misalignments. Also, spring torsional couplings are also available as the torsional couplings.
Grid couplings are very good at dampening the vibrations. These grid couplings have some quite similar components as the gear couplings except the gear meshing. the hubs will have the slots and these slots will mesh with the steel spring. These grid couplings cannot accommodate the parallel misalignments. Minimal angular misalignments can be provided and a good amount of axial misalignment can be accommodated. Grid coupling can transmit the high torques because of its metallic design.
Diaphragm coupling also uses thin sheets as a flexible element as like the disc coupling. On the outer diameter side of the diaphragm will be bolted with the hub and the inner side diameter portion of the diaphragm disc will be fitted into the slots of the spool portion. On the other end of the spool will be again joined by a diaphragm disc with a hub. Diaphragm couplings can accommodate all the three misalignments with more range of misalignment axially.
The fluid coupling also is known as the hydraulic couplings. There will be two turbines covered by housing to fill the fluid. One impeller will be installed on the drive shaft and the other will be on the driven shaft. These two impellers will be connected with the fluid supported by the housing. The fluid will transmit the torque slowly into the driven impeller as the speed increases. This fluid coupling will be used as the mechanical clutch.
The heating temperature of the metal flexible coupling is one of the important process parameters of the heat treatment process. The selection and control of the heating temperature is the main issue to ensure the quality of the heat treatment. The heating temperature varies with the metal material being processed and the purpose of the heat treatment, but it is generally heated above the phase transition temperature to obtain a high-temperature structure. In addition, it takes time for the transformation. Therefore, when the surface of the metal workpiece reaches the required heating temperature, it must be maintained at this temperature for a period of time to make the internal and external temperatures consistent and transform the microstructure.
The repair of flexible couplings has its technical nature, which requires the repairer to fully understand the corresponding technical requirements of the bearing. The flexible coupling contains an elastic compound of pre-compressed rubber to provide additional strength and extend service life. The wheel hub is made of high-strength aluminum alloy, which is both lightweight and corrosion-resistant. The rubber component is mainly used for shock absorption, making the power transmission smooth and quiet to protect the machine.
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.
The working speed of the flexible 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, the universal coupling can be used for the connection of large angular displacement or intersecting two shafts.
The reliability and working environment of the flexible coupling. Flexible coupling usually made of metal elements that do not require lubrication are more reliable. The surrounding working environment of flexible 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 flexible 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.
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