The fundamentals of flexible shaft couplings
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- Adela Lawrence
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1 Technical Article October 2016 The fundamentals of flexible shaft couplings Understanding the basic requirements for shaft couplings The requirements to connect shafts on different types of machines have led to a diverse market for flexible couplings. At one extreme are simple, low cost couplings perhaps connecting shafts of 4 or 5mm diameter. At the other are large, expensive multi-part couplings with shaft sizes in the region of 150 to 500mm. What unifies them is the basic need to accept shaft misalignment, together with meeting machine specific backlash and rigidity conditions. This article examines and explains these fundamental performance criteria. Backlash For the design engineer, backlash in a drive train is unwanted. However shaft couplings with backlash can be lower in cost and easier to fit. So the question is whether backlash can be tolerated? Couplings that have a one-piece construction or that have bolted joints are backlash free. They are useful for precise positioning and to avoid wear on reversing drives. Where the drive does not reverse and the stop position accuracy is not critical, couplings with backlash should be considered. Torsionally soft or rigid? Torsionally soft couplings usually incorporate a rubber or plastic element, and their use leads to reduced shock transmission, higher misalignment capacity and lower costs. They will exhibit an amount of wind-up or twist proportional to the applied torque, perhaps 2, which may make them inappropriate for precision drives. Torsionally rigid couplings are constructed from aluminium or steel and their higher cost is justified by
2 use in servo systems, positioning and reversing drives which need a higher performance. Note that no couplings are absolutely rigid. The torsional stiffness values will be given in units of Nm/ or Nm/radian. Typically for a shaft diameter of 25mm a coupling with high rigidity will have a stiffness of 200 to 500Nm/. The wind-up will depend on coupling type, but in most cases it will represent less than 0.1. Misalignment The three types of shaft misalignment can be defined as angular, radial and axial. Sometimes designers believe they can align shafts so accurately that no flexible coupling is needed. In reality tiny amounts of misalignment will remain and if a rigid shaft connection is used problems such as high bearing loads can result. Angular misalignment This is the angle between the centrelines of the two shafts. Torsionally soft couplings can accept up to 3 of angular misalignment, torsionally rigid couplings are generally capable of about 1. It is good practice to align shafts as accurately as possible and an accurate assembly will have less than 1 misalignment. In some cases more angular misalignment is needed and couplings capable of 6 exist. However above 3 it is often better to go for a universal joint. Radial misalignment Radial misalignment is also known as parallel misalignment and is the radial distance between the centrelines of two shafts. A well aligned installation would have a radial misalignment value below 0.2mm. However torsionally soft couplings can accept values up to 0.6mm.
3 Axial misalignment Also known as end-float, axial misalignment can be a result of thermal expansion as the machine heats up. One piece couplings have low values but there are other couplings where 2 to 3mm movement is possible. Many installations will have a combination of all 3 types of misalignment and it is good practice to avoid running at the coupling performance limits. When searching for the right coupling, it is best to talk to a supplier who can offer alternatives, not just the best combination of price and performance but also to consider other requirements such as high/low temperatures, corrosion protection, blind assembly and electrical insulation. Techdrives in Bedford have an extensive range and have been supplying shaft couplings to the UK market for 40 years. Techdrives supply a wide range of flexible couplings, rigid couplings and universal joints. Twenty types of shaft couplings are available for shaft diameters from 3 to 475mm including spacer versions up to 5m long. Full information is available on
4 Angular This is usually present to some extent on all applications, typical values are 0.5 to 2. Sometimes higher values are necessary. Radial Words 615 Also known as parallel misalignment, this is nearly always present. A well aligned installation might have values below 0.2mm. Axial This can be considered as end float. It is sometimes caused by thermal expansion or can be a result of the machine process. Jaw couplings torsionally soft but often with backlash
5 Bolted rubber disc coupling torsionally soft and backlash free Metal disc coupling torsionally rigid and backlash free 648 words
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