🎰 Key (engineering) - Wikipedia

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Detailed width tolerance information is best drawn from the manufacturer. Inch (​ANSI/AGMA B4). Inch Keyway. Nominal Shaft Diameter.


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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, term keyseat is rarely.


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For a key to function properly, both the shaft and rotating elements (gear, pulley and coupling) must have a keyway and a keyseat. Usually the term keyseat is.


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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, term keyseat is rarely.


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list.cellaz.ru β€Ί Reference β€Ί KeywayDimensions.


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Metric Standard Parallel Keyway and Key Sizes. Shaft Diameter. (mm). Keyway. (​mm). Key. (mm)*. From. To. Width. (W). Depth. (h). Width. (W). Depth. (T). 6. 8. 2.


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Metric Standard Parallel Keyway and Key Sizes. Shaft Diameter. (mm). Keyway. (​mm). Key. (mm)*. From. To. Width. (W). Depth. (h). Width. (W). Depth. (T). 6. 8. 2.


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list.cellaz.ru β€Ί Reference β€Ί KeywayDimensions.


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Detailed width tolerance information is best drawn from the manufacturer. Inch (​ANSI/AGMA B4). Inch Keyway. Nominal Shaft Diameter.


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For a key to function properly, both the shaft and rotating elements (gear, pulley and coupling) must have a keyway and a keyseat. Usually the term keyseat is.


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For example, Gear drives, Pulleys or Sprockets are connected securely using keys to the power transmitting shaft Figure 1. Because vibration or rotational direction reversal often push the key out. They can be used for larger shafts when deeper key depth is desirable compared to rectangular keys. Figure 9. Parallel sunk keys Parallel sunk keys can be either rectangular or square section but without the taper. Increase in depth means weaker shaft due to a reduction in effective shaft cross-sectional area. Figure 3 Figure 3. Refer to tabulated dimensions and tolerances of metric keyways for parallel keys and woodruff keys as per BS Along with keyway size tolerances and keyway depth sizes, some standards also provide information on recommended key size, keyway depth as a function of shaft diameter. Figure 3. Parallel sunk keys can be either rectangular or square section but without the taper. As shown in below figure, Saddle keys can be sub divided into Flat saddle and Hollow saddle keys and are only suitable for light loads to avoid slipping along the shaft. Figure 1. Power transmission is achieved through friction between the shaft and the key. Along with keyway size tolerances and keyway depth sizes, some standards also provide information on recommended key size, keyway depth as a function of shaft diameter Recommendations for key size, length and keyway depth as a function of shaft diameter are provided in ASME Standards B Was this article helpful? The round keys are circular in section and fit into holes drilled partly in the shaft and partly in the hub. Figure 6. Figure 5. The key fits into a tapered hub keyway pushing down on the flat face of the shaft. Sunk keys are sunk into the shaft for half its thickness, where the measurement is taken at the side of the key. Increase in depth means weaker shaft due to the reduction in effective shaft cross-sectional area. Log into your account. The tangent keys or sometimes called Tangential keys are fitted as a pair at right angles as shown in figure 15, where each key withstands torsion in one direction only. If the set screws or in some cases of keyed joints are to be used, there must be a method of axial constraints such as circlips and retaining rings. Yes No. Forgot your password? Retention elements such as Splines , flexible couplings , tapered joints etc are also used. Keys and Keyways. Square and rectangular keys may have a taper of 1 in along the length of the key as shown in figure 6. A hollow saddle key is tapered at the top and curved at the bottom as shown in figure The key fits into a tapered hub keyway and pushed down on the curved circumferential surface of the shaft. 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. This should only be considered if the material is ductile. Feather keys are attached to either the shaft or the hub to permit relative axial movement. These are used in large heavy-duty shafts. As shown in the picture there are three main feather keys. Password recovery. Privacy policy. There are various advantages and disadvantages of using shaft keys hence proper consideration must be given to the finer details of the overall design to evaluate the suitability of the keyed joint. As shown in figure 8, Gib head sunk keys are generally rectangular or square keys with a taper on the top surface to ensure tight fit. For these, the calculations should be based on one and a half parallel key. Round keys are usually considered to be most appropriate for low power drives. Not along the centre line through the shaft. A Gib head on sunk keys is added to make it easier to remove. This enables power transmission between the shaft and hub with its parallel opposite faces, at the same time allowing it to slide. These keys are inexpensive and readily available. Tangential Keys and Tangential Keyways source : fasten. Figure Types of Saddle keys source:ques. Figure 8. They have the advantage of easy manufacturing as their keyways may be drilled and reamed after the mating parts have been assembled. Figure 7. Its one of the easiest to install. Shaft and hub keyways are often cut on key seating machines but can also be made using broaching, milling, shaping, slotting EDM. Compared to sunk keys, saddle keys are not sunk into the shaft and hub instead they are only sunk into the hub. A key is usually made from steel and is inserted or mounted between the shaft and the hub of the component in an axial direction to prevent relative movement. Double key β€” Because of manufacturing tolerances and to avoid double fits, only one parallel key is used, but Double keys are occasionally used for very high infrequent loads.

A key and the keyways make up keyway shaft Keyed joint to secure the hub and the shaft to prevent continue reading movement between a power transmitting shaft keyway shaft an attached component.

Double-headedPeg feather and Feather key. The advantages of Woodruff key is that it is capable of accommodating any taper in the hub keyway, its captive and the depth prevents the key from turning over.

Rectangular keys as shown are wider than its height and sometimes called flat key. About Contact Us Disclaimer Privacy policy.

But the keys need to be ideally held by a set screw through the hub. Woodruff keys car not capable of carrying the same load as the long parallel keys. Recover your password. Of the above types of keys, Parallel square key and woodruff key are probably used more widely than others due to ease of use and cost. Sign in. These keys are generally fitted tightly to the bottom of the shaft keyway and the sides of the keyed joint, leaving a clearance at the top of the hub keyway. Sunk Keys Sunk keys are sunk into the shaft for half its thickness, where the measurement is taken at the side of the key. The key fits into a tapered hub keyway pushing down on the flat face of the shaft Figure Flat saddle key engagement source : lifelarn A hollow saddle key is tapered at the top and curved at the bottom as shown in figure Hollow saddle key engagement source:lifelarn Tangent keys The tangent keys or sometimes called Tangential keys are fitted as a pair at right angles as shown in figure 15, where each key withstands torsion in one direction only. Generally, term keyseat is rarely used as keyway is referred to both recesses in the industry Figure 2. Figure 10 Woodruff keys source : indiamart The advantages of Woodruff key is that it is capable of accommodating any taper in the hub keyway, its captive and the depth prevents the key from turning over. Figure 2. They either sit on a flat or circumference of the shaft. The extra key width allows it to transmit greater torque without increasing the depth. Woodruff key is a semi-circular disc and fits into a circular recess in the shaft which is machined by a woodruff keyway cutter. Gib head sunk keys A Gib head on sunk keys is added to make it easier to remove.