Introduction : A key is a piece of mild steel inserted between the shaft and hub or boss of the pulley to connect these together in order to prevent relative motion between them. It is always inserted parallel to the axis of the shaft.
What is difference between keys and splines?
The main difference between splines and keys is that splines are integral with the shaft but keys are inserted between shaft and hub. As compared with one or two keys used for load transmission, there are usually four or more splines on a shaft.
What are the different types of keyways?
Types. There are five main types of keys: sunk, saddle, tangent, round, and spline.
What is shaft key and coupling?
Shafts can carry gears, pulleys, and sprockets in order to transmit rotary motion and power via mating gears, belts, and chains. Alternatively, a shaft may simply connect to another shaft via a coupling mechanism. Couplings are connected to a shaft by means of a key, keyway, or keyseat.
What is flange coupling?
Flange Couplings are connectors between rotating chutes that have two arrangements of flanges. One of these chutes or flanges is fixed toward the finish of each shaft. To finish the process of transferring power, both the flanges are attached together with numerous nuts and screws.
What is shaft coupling?
A shaft coupling is a mechanical component that connects the drive shaft and driven shaft of a motor, etc., in order to transmit power. Shaft couplings introduce mechanical flexibility, providing tolerance for shaft misalignment. In NBK, the former is called a coupling and the latter is called a shaft coupling.
What is Kennedy key?
The Kennedy key consists of two square keys. The hub is bored off the centre and the two keys force the hub and the shaft to a concentric position. Kennedy key is used for heavy duty applications. The two equal and opposite forces are due to the transmitted torque.
Where are splines used?
Heavy Machinery: Spline shafts are frequently used in automobiles, aviation, and earth moving machinery as they can handle high rotation speeds to deliver torque. Unlike alternative shafts like key shafts, spline shafts can deliver more torque due to the even distribution of the load across all the teeth or grooves.
How many types of shafts are there?
Shafts are mainly classified into two types: Transmission shafts are used to transmit power between the source and the machine absorbing power. e.g., countershafts, line shafts, and all factory shafts. Machine shafts are an integral part of the machine itself.
What is the difference between a Keyseat and keyway?
Keyseat is a recess in the shaft and the Keyway is the recess in the hub to receive the key and thus securely lock the component. Generally, the term keyseat is rarely used as keyway is referred to both recesses in the industry (Figure 2).
How many types of couplings are there?
However there are two main types of couplings (Fig 1) which are (i) rigid couplings, and (ii) flexible couplings. Rigid couplings are used for shafts having no misalignment. Since these couplings cannot absorb any misalignment the shafts to be connected by a rigid coupling must have good lateral and angular alignment.
Keys and Couplingswhich transmits a turning moment and also permits axial movement. It is fastened either to the shaft or hub, the key being a sliding fit in the key way of the moving piece. The feather key may be screwed to the shaft as shown in Figure 6.3(a) or it may have double gib heads as shown in Figure 6.3(b).
What are the types of keys in a pulley?
A key way is a slot or recess in a shaft and hub of the pulley to accommodate a key. 1. Sunk keys , 2. Saddle keys , 3. Tangent keys, 4. Round keys, and 5. Splines. We shall now discuss the above types of keys, in detail, in the following pages.
What are the different types of keys?
1. Sunk keys , 2. Saddle keys , 3. Tangent keys, 4. Round keys, and 5. Splines. We shall now discuss the above types of keys, in detail, in the following pages. Sunk Keys.
What are the characteristics of parallel sunk keys?
The parallel sunk keys may be of rectangular or square section uniform in width and thickness throughout. It may be noted that a parallel key is a taperless and is used where the pulley, gear or other mating part is required to slide along the shaft.
