Welcome to Linquip Blog. Today and in this article, we are going to deal with the question “What is a Sleeve Coupling?”. The information in this article gives a significant collection of data you need to know about some specifications, and privileges of Sleeve couplings.
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An Introduction to the Sleeve Couplings, Their Parts & Materials
Couplings are used to connect two shafts for torque transmission in varied applications. Coupling may be rigid or they may provide flexibility and compensate for misalignment. They may also reduce shock loading and vibration. There are two main types of couplings: Rigid couplings and Flexible couplings. Rigid couplings are used for shafts having no misalignment while the flexible couplings can absorb some amount of misalignment in the shafts to be connected.
One of the simple types of rigid coupling is a sleeve coupling which consists of a cylindrical sleeve keyed to the shafts to be connected. It is made of cast iron. It consists of a hollow cylinder whose inner diameter is the same as that of the shaft (sleeve). It is fitted over the ends of the two shafts by means of a gib head key. The power is transmitted from one shaft to the other shaft by means of a key and a sleeve.
In other words, a Sleeve coupling is a basic type of couplings including a pipe whose bore is finished to the required tolerance based on the shaft size. Based on the usage of the Sleeve Coupling a keyway is made in the bore in order to transmit the torque by means of the key. Two threaded holes are provided to lock the coupling in position.
Sleeve couplings are known also as Box Couplings. In this case, shaft ends are coupled together and abutted against each other which are enveloped by muff or sleeve. A gib head sunk keys holds the two shafts and sleeve together.
The Structure, Design & Working Principle of Sleeve Coupling
So far, we are somehow familiar with jaw couplings and know what they are basically used for. Let’s take a closer look at how jaw couplings work.
The sleeve coupling transmits low to medium torque between connected equipment in shear through an elastomeric insert with male splines that mate with female hub splines. The insert material is typically EPDM, Neoprene, or Hytrel and the insert can be a one-or-two-piece design.
The muff or sleeve is made into two halves and are bolted together. The halves of the muff are made of cast iron. The shaft ends are made to butt each other. A single key is fitted directly in the keyways of both the shafts. One-half of the muff is fixed from below and the other half is placed from above.
Both the halves are held together by means of mild steel studs or bolts and nuts. The number of bolts may be two, four, or six. The advantage of this coupling is that the position of the shafts need not be changed for assembling or disassembling of the couplings.
In other words, in sleeve couplings, the shafts are taken and the keys are slid over it. Both the shafts along with the keys are then fitted into the sleeve. In this way, a sleeve coupling is assembled. In the following section, we will meet the advantages and disadvantages of the sleeve, muff, or as it is called box coupling.
Jaw Coupling Applications
Sleeve couplings are nothing but just a sort of thick hollow cylinder/pipe called as sleeve or muff. The sleeve is manufactured keeping the diameter of the shaft in mind so that the shaft fits perfectly into the sleeve. The driver & driven, both the shafts are then inserted into each side of the sleeve. Also, two or more threaded holes are provided into the sleeve as well as in both of the shaft’s ends so that they don’t move in the longitudinal direction when the bolts are inserted into them. Also, the keyway and key ensure that the shaft and sleeve don’t slip.
The sleeve coupling is easy to manufacture as there are a few numbers of components.
- used where the shafts don’t require any alignments and load capacity is light to medium duty.
- To transmit power from the driving shaft to the driven shaft.
- To connect or couple 2 components which are manufactured separately for example output motor shaft and generator.
- To introduce extra flexibility while transmitting power in case of space restrictions.
- To introduce protection against overloads.
- To reduce the transmission of shock loads from one shaft to another by using flexible couplings.
Advantages & Disadvantages of Sleeve Couplings
Finally, we reach the last section of this article. In this section, we want to introduce some of the most important advantages and disadvantages of sleeve couplings. Here are the pros and cons of using sleeve couplings:
- It is the simplest type of coupling with only a two-part structure
- It is compact in size
- It has no projecting parts which make it safe for usage
- It cost low to purchase and maintenance
- It cannot tolerate any misalignment in the axes of the shafts
- It is difficult to assemble or disassemble as the sleeve has to be shifted over a shaft or shaft end.
- It is not able to absorb shocks or variations during power delivery
The present article was an attempt to deal with the question “What Is a Sleeve Coupling?” and deliver all the essential information about how it works and where it is used. A Sleeve coupling is a basic type of couplings including a pipe whose bore is finished to the required tolerance based on the shaft size. Based on the usage of the Sleeve Coupling a keyway is made in the bore in order to transmit the torque by means of the key. Two threaded holes are provided to lock the coupling in position.
If you have any experience of using Sleeve Couplings, we will be very glad to have your opinions about their performance in the comments on our website Linquip. Moreover, if you have any questions about this topic, you can sign up on our website and wait for our experts to answer your questions. Hope you enjoyed reading this article.