KEYS AND KEYWAYS PDF!
Lecture 5 Keys and keyways. Introduction. A key, Fig. , is usually made from steel and is inserted between the joint of two parts to prevent relative. In mechanical engineering, a key is a machine element used to connect a rotating machine element to a shaft. The key prevents relative rotation between the two parts and may enable The more exact fit of the key and keyway also reduces play, and stress concentrations in, and improves the reliability of the key.Types · Sunk key · Keyseating · Keyseater. This section provides information regarding Taper keys and keyways, their dimensions for different diameters of the shaft and hub. The preferred lengths of the.
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In these situations a Spline Shaft could be used.
Features and Applications Use of Grub Screws on a Plain Shaft This is a relatively straightforward means of attaching components to shafts suitable for light to moderate loading. It requires no special tooling needing only holes to be drilled and tapped into the body of the component.
Use of a Squared Shaft Suitable only where a component is fitted at the end of a shaft but keys and keyways of transmitting very high loads and provides a positive location of the component in one of four positions.
Feather Key aka Flat Key These can be used at any point along the shaft to provide a very positive location and capable of transmitting high loads may need spacers or the keys and keyways of other components to prevent movement along the axis of the shaft.
Square keys are used for smaller shafts and rectangular faced keys are used keys and keyways shaft diameters over 6. Set screws often accompany parallel keys to lock the mating parts into place.
The circular segment can be cut directly by plunge cutting with a circular Woodruff keys and keyways without any reliefs. The main advantage of the Woodruff key is the elimination of milling near shaft shoulders, where stress concentrations and concentricity would be affected.
The more exact fit of the key and keyway also reduces play, and stress concentrations in, and improves the reliability of the key. An additional advantage is a stuck key can be removed from a shaft with a hammer blow, the circular profile will push keys and keyways key out of the slot, as opposed to a standard key which will need to be pushed axially, or pulled out of its slot.
Common applications include machine toolsautomotive applications, snowblowers and marine propellers.
Key (engineering) - Wikipedia
This type of key was developed by W. Keys and keyways keyway in the hub has a taper that matches that of the tapered key. Some taper keys have a gib, or tab, for easier removal during disassembly. The purpose of the taper is to secure the key itself, as well as, to firmly engage the shaft to the hub without the need for a set screw.
The problem with taper keys is that they can cause the center of the shaft rotation to be slightly off of the mating part. Others[ edit ] Keys and keyways Scotch key or Dutch key features a circular keyway hole instead of rectangularproduced by drilling axially into the assembled hub and shaft, with a metal dowel pin serving as the key.
If the hole and key are tapered, the key is referred to as a Dutch pin, which is driven in and optionally finished by cutting or grinding flush with the end of the keys and keyways. If a straight Dutch keyway hole is optionally tapped with a thread, then an ordinary screw serves as the threaded Dutch key.
Spring pins are an alternative Dutch key component, instead of solid dowel pins.
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