![]() ![]() It is more robust than using a key because maintenance only requires one tool and the self-centering balanced rotation means it lasts longer than a keyed joint would, but the downside is that it costs more. An alternative coupling device to the traditional parallel key, the tapered lock removes the possibility of play due to worn keyways. The basic idea is similar to a clamp coupling but the moment of rotation is closer to the center of the shaft. This coupling is used for heavy power transmission at moderate speed.Ī tapered lock is a form of keyless shaft locking device that does not require any material to be removed from the shaft. ![]() The advantages of this coupling is that assembling or disassembling of the coupling is possible without changing the position of the shaft. In this coupling, the muff or sleeve is made into two halves parts of the cast iron and they are joined together by means of mild steel studs or bolts. A key and sleeve are useful to transmit power from one shaft to another shaft. The hollow pipe is fitted over a two or more ends of the shafts with the help of the taper sunk key. It consists of a hollow pipe whose inner diameter is same as diameter of the shafts. It is made from the cast iron and very simple to design and manufacture. This is the simplest type of the coupling. A gib head sunk keys hold the two shafts and sleeve together. In this case shaft ends are coupled together and abutted against each other which are enveloped by muff or sleeve. Sleeve couplings are also known as Box Couplings. Two threaded holes are provided in order to lock the coupling in position. Based on the usage of the coupling a keyway is made in the bore in order to transmit the torque by means of the key. Examples:Ī sleeve coupling consists of a pipe whose bore is finished to the required tolerance based on the shaft size. Rigid couplings are used when precise shaft alignment is required shaft misalignment will affect the coupling's performance as well as its life. Because of their size and durability, flanged units can be used to bring shafts into alignment before they are joined together. A series of screws or bolts can then be installed in the flanges to hold them together. One coupling is placed on each shaft so the two flanges line up face to face. They consist of short sleeves surrounded by a perpendicular flange. They generally are large enough so that screws can pass all the way through the coupling and into the second half to ensure a secure hold.Flanged rigid couplings are designed for heavy loads or industrial equipment. They offer more flexibility than sleeved models, and can be used on shafts that are fixed in place. To alter the vibration characteristics of rotating units.Ĭlamped or compression rigid couplings come in two parts and fit together around the shafts to form a sleeve.To introduce protection against overloads.To reduce the transmission of shock loads from one shaft to another.To provide for misalignment of the shafts or to introduce mechanical flexibility.To provide for the connection of shafts of units that are manufactured separately such as a motor and generator and to provide for disconnection for repairs or alterations. ![]() To transfer power from one end to another end.(ex: motor transfer power to pump through coupling) Primary function.The most common of which are the following. Shaft couplings are used in machinery for several purposes. ![]() 3 Requirements of good shaft alignment / good coupling set up. ![]()
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