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Encyclopedia > Bushing
Crankshaft, babbitt metal, plain bearing shells
Crankshaft, babbitt metal, plain bearing shells

A mechanical bushing is a cylindrical lining designed to reduce friction and wear, or constrict and restrain motion of mechanical parts. plain bearing shells scan, upload by MH 12:22, 2004 Oct 8 (UTC) This image has been released into the public domain by the copyright holder, its copyright has expired, or it is ineligible for copyright. ... plain bearing shells scan, upload by MH 12:22, 2004 Oct 8 (UTC) This image has been released into the public domain by the copyright holder, its copyright has expired, or it is ineligible for copyright. ...


In a skateboard, the bushing can be stiffer or softer. A stiffer bushing provides a more stable ride and prevents wobbling at higher speeds where a softer bushing allows for a softer ride with the ability to carve turns more easily.


Bushings are also used to transfer loads from a fastening to a much larger area in the underlying structure, the object being to reduce the strain on individual fibers within the underlying structure.


In a car or other vehicle's suspension, bushings are used to connect the various moving arms and pivot points to the chassis and other parts of the suspension. In order to minimise vibration, wear and transmission of noise, they often incorporate flexible material such as rubber or polyurethane. These bushings often take the form of an annular cylinder of flexible material inside a metallic casing or outer tube. They might also feature an internal crush tube which protects the bushing from being crushed by the fixings which hold it on to a threaded spigot. Many different types of bushing designs exist [1]. The front suspension components of a Ford Model T. Suspension is the term given to the system of springs, shock absorbers and linkages that connects a vehicle to its wheels. ... Look up Chassis in Wiktionary, the free dictionary. ... Latex being collected from a tapped rubber tree Rubber is an elastic hydrocarbon polymer which occurs as a milky colloidal suspension (known as latex) in the sap of several varieties of plants. ... A polyurethane is any polymer consisting of a chain of organic units joined by urethane links. ... The term Spigot can refer to: Spigot ( object ) - a small wooden plug Tristan A. Farnon - cartoonist Tristan A. Farnon Spigot Algorithms - a type of algorithm The AT-4 Spigot - a man-portable ATGM manufactured in the former Soviet Union and not to be confused with the M136 AT4 in service...


Another type of bushing is a hardened threaded fixing hole which allows one assembly to be fixed to another by means of a screw or threaded bolt. The use of a bushing can make assembly easier because it avoids the need for a separate nut and washer on the other side of the fixed material. Bushings can be fitted into sheet material by riveting - often the rivet itself incorporates the bushing. In the electrical field bushings are circular plastic ring fittings that slide or screw onto conduit or connectors to provide protection to the insulated cables that will be pulled through them. Bushings play an important role in assuring the integrity of cables during and after their installation. Screw thread, used to convert torque into the linear force in the flood gate. ... Screws come in a variety of shapes and sizes for different purposes. ... A bolt may be one of the following things: For bolts and capscrews, see Bolted joint. ... A nut is a type of hardware fastener with a threaded hole. ... the term washer may refer to one of the following. ... A rivetted buffer beam on a steam locomotive A rivet is a mechanical fastener consisting of a smooth cylindrical shaft with heads on either end, the second one formed in position. ... The article on electrical energy is located elsewhere. ... A conduit is a general term for a means of conveying something from one location to another or between persons. ...


A typical plain bearing is made of two parts. For example a rotary plain bearing can be just a shaft running through a hole. A simple linear bearing can be a pair of flat surfaces designed to allow motion, for example a drawer and the slides it rests on.


Plain bearings may carry load in one of several ways depending on their operating conditions, load, relative surface speed (shaft to journal), clearance within the bearing, quality and quantity of lubricant and temperature (affecting lubricant viscosity). If full-film conditions apply, the bearing's load is carried solely by a film of fluid lubricant, there being no contact between the two bearing surfaces. In this condition they are known as fluid bearings. In mix or boundary conditions, load is carried partly by direct surface contacts and partly by a film forming between the two. In a dry condition, the full load is carried by surface to surface contact. Fluid bearings are bearings which solely support the bearings loads on a thin layer of liquid or gas. ...


Plain bearings are relatively simple and hence inexpensive. They are also compact, light weight, straightforward to repair and have high load-carrying capacity. However, if operating in dry or boundary conditions plain bearings may wear faster and have higher friction than rolling element bearings. Dry and boundary conditions may be experienced even in a fluid bearing when operating outside of its normal operating conditions, i.e., at startup and shutdown. Fluid bearings are bearings which solely support the bearings loads on a thin layer of liquid or gas. ...


A common plain bearing design is to use a hardened and polished steel shaft and a soft bronze bushing. In such designs the softer bronze portion can be allowed to wear away, to be periodically renewed. The steel cable of a colliery winding tower. ... Assorted ancient Bronze castings found as part of a cache, probably intended for recycling. ...


Plain 'self-lubricating' bearings utilize porous journals within which a lubricant is held. As the bearing operates and lubricant is displaced from the bearing surface, more is carried in from non-wear parts of the bearing. Dry plain bearings can be made of a variety of materials including PTFE (Teflon), graphite, graphite/metal (Graphalloy) and ceramic. The ceramic is very hard, and sand and other grit which enter the bearing are simply ground to a fine powder which does not inhibit the operation of the bearing. Teflon is polytetrafluoroethylene (PTFE), a polymer of fluorinated ethylene. ... Fixed Partial Denture, or Bridge The word ceramic is derived from the Greek word κεραμικός (keramikos). ...


Solid polymer plain bearings are now increasingly popular due to dry-running lubrication-free behaviour. Polymer plain bearings now provide the step from a simple plastic bushing to the proven and tested, and thereby predictable and quickly available, machine component. Solid polymer plain bearings give low weight and corrosion resistance, as well as the freedom from maintenance and lubrication enable a solution for almost all applications. Managing without lubrication is the dream of every design engineer. With modern materials, polymer plain bearings make this a reality. After research spanning decades, an accurate calculation of the service life of polymer plain bearings is possible today. It is important not to confuse a solid polymer plain bearing with a polymer coated plain bearing, which is a much older technology. Many companies produce bushings which consist of a metal shell which then has a very thin polymer coating (usually PTFE or similar) applied to the inside.


External Links

Several bushing drawings


References


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