Bearings Types And Applications Pdf


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11.02.2021 at 19:09
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bearings types and applications pdf

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It restricts relative movement to reduce the load placed on the part and the machine. But there are different types of bearings, including plain, ball, roller, fluid and magnetic.

Bearings A bearing is a device that is used to enable rotational or linear movement, while reducing friction and handling stress. Resembling wheels, bearings literally enable devices to roll, which reduces the friction between the surface of the bearing and the surface its rolling over.

Types of Bearings - A Thomas Buying Guide

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Bridge bearings are structural equipment or devices installed between bridge substructure and superstructure to transfer the applied load including earthquake loads; wind loads; traffic loads; and superstructure self-weight. Bridge bearings also makes rooms for relative movements between superstructure and substructure, for instance, rotation movements and translational movements in horizontal and transverse direction. Bearing used in the construction of bridge structure is divided into two major categories namely expansion bearings and fixed bearings.

The former permits both translational and rotational movements whereas the latter allow rotational and limited translational movements. There are several types of bridge bearings which have been employed in bridge construction which are discussed below. Sliding bearing consist of two metal plates, commonly stainless-steel plates, that slide relative to each other and hence makes room for translational movement and lubricating material between them as illustrated in Figure A friction force is generated in sliding bearing and it is imposed on substructure, superstructure and sliding bearing itself.

So, it may be required to provide lubricant such as polytetrafluoroethylene PTFE to decline generated friction. This is because sliding bearing cannot be purely used if the bridge experiences rotation movement.

However, the span restriction for sliding bearing utilization can be disregarded when it is used in combination with other bearing types. Rocker is an expansion bearing composed of curved surface at the bottom, which accommodate translational movement and a pin at the top makes room for rotation movement as illustrated Figure-2 and Figure-3 in detail.

Pin bearing is a fixed bearing that make room for rotation movement through the application of steel pin. It has similar structure and component like rocker bearing apart from the bottom of pin bearing which is flat and fixed to the concrete pier, as can be observed in Figure Both rocker and pin bearings are mainly employed in steel bridge structure. Rocker and pin bearing should be considered when the bridge movement is adequately known and described, since such bearings can make rooms for both translational and rotational movements in one direction only.

These bearings are likely to suffer deterioration and corrosion, so it is necessary to conduct regular inspection and maintenance.

Roller bearing can be used in the construction of reinforced concrete and steel bridge structure. There are two main configurations including single roller bearing which is composed of one roller placed between two plates and multiple roller bearing that consist of several rollers installed between two plates.

The former as shown in Figure-5 can accommodate both rotation and translation movement in longitudinal direction and it is cheap to manufacture but its vertical load capacity is limited. In contrary, the latter as shown in Figure-6 can make room for translation movement only and rotation movement can be accommodated if rollers are combined with pin bearing.

Multiple roller bearings are expensive and support considerably large vertical loads. Regular inspection and rehabilitation should be conducted since roller bearing are susceptible to corrosion and damages. It consists of elastomer manufactured from synthetic or natural rubber and can take both translation and rotation movements through elastomer deformation.

The ability of elastomer to carry large vertical loads is because of reinforcement provision that prevents lateral bulging of elastomer. There are number of elastomeric bearing pads classified based on types of reinforcements used. For example, steel reinforced, plain, fiberglass reinforced and cotton duck reinforced elastomeric bearing pads. Strength and response of each type is different, steel reinforced elastomeric bearing is the strongest one and plain elastomeric pad is the weakest.

Elastomeric bearing is neither expensive nor requires considerable maintenance, that is why it the most desired bearing type. Figure-7 show details of elastomeric bearing and its application in bridge structure.

It consists of two curved plate that match each other as shown in Figure 8. If curved bearing is cylindrical, then it only accommodates rotation movements. However, both rotation and translational movements can be dealt with if curved bearing is spherical. Due to the fact that both gravity loads and curved geometry generate lateral resistance against and consequently lateral movement would be limited, that is why polytetrafluoroethylene PTFE slider is adhered to the bearings in order to make rooms for lateral movements.

Details of curve bearings can be seen in Figure As shown in Figure-9, pot bearing consists of elastomeric disk confined in a pot, steel piston that is properly tailored into the pot wall and flat sealing rings which keeps elastomeric inside the pot.

Pot bearing can support considerable vertical loads and it is commonly transferred through steel piston to the elastomeric disc which is almost incompressible.

As far as lateral load is concerned, it is transferred as the steel pistol moves toward pot wall. Translational movement is limited in pure pot bearing that is why PTFE are introduced to the sliding surface to make rooms for translation movement.

Different components of disk bearing are shown in Figure in detail. Rotation movement is accommodated through the deformation of elastomer whereas the translation movement is considered through the application of PTFE slider. The utilized elastomer should be adequately hard to support vertical loads without suffering large deformations and sufficiently flexible to allow rotational movement.

Both vertical loads and lateral loads are supported by elastomeric disk and metal ring in the center of the bearing respectively. Sign Up Sign Up to The Constructor to ask questions, answer questions, write articles, and connect with other people. Have an account? Sign In Now. Free Signup or Login to continue Reading Remember Me! Don't have account, Sign Up Here. Forgot Password Lost your password? VIP Dashboard. Previous article. Next article. Related Posts.

Bearing (mechanical)

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In addition to tapered roller bearings, there are a number of other roller bearing types including cylindrical and needle bearings. The characteristics and uses of.


Bearing-and-their-types.pdf

Bearings are mechanical assemblies that consist of rolling elements and usually inner and outer races which are used for rotating or linear shaft applications, and there are several different types of bearings, including ball and roller bearings, linear bearings, as well as mounted versions that may use either rolling element bearings or plain bearings. Ball bearings have spherical rolling elements and are used for lower load applications, while roller bearings use cylindrical rolling elements for heavier load carrying requirements. Linear bearings are used for linear movements along shafts and may also have rotational capabilities. Mounted bearings are assemblies in which the bearings are pre-assembled in mountings that, in turn, are bolted to frames, stanchions, etc. In addition to ball and roller bearings in their radial, linear, and mounted forms, bearings include those for civil engineering applications, which are called slide bearings; those used in small instruments and the like, known as jewel bearings; and very specialized bearings known collectively as frictionless bearings which includes air and magnetic varieties.

Stop wasting time on admin! Order your sheet metal fabrication online. Immediate pricing and short lead times all over the UK. From a small supermarket trolley to huge power plants, a great number of light-duty as well as industrial equipment could not function without the use of bearings in some form.

Select Language. A general catalog for all bearings used in a wide variety of fields, including cars, motorcycles, electric machinery, machine tools, aerospace equipment, OA equipment and other general industrial machinery. A catalog for various large rolling bearings used in steel production equipment, wind power generation equipment, civil engineering machinery and other large industrial machinery. Describes large bearings with internal diameters of mm or more.

A bearing is a machine element that constrains relative motion to only the desired motion, and reduces friction between moving parts.

A mechanical bearing is a component used between two parts that allows rotational or liner movement, reducing friction and enhancing performance to save energy. Both metal and plastic bearings can be found everywhere, from refrigerators to computers to the or so bearings found in your car. The concept behind them is a simple one: things roll better than they slide. They are composed of a smooth inner and outer metal surface for metal balls to roll against.

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Introduction: Bearings are machine elements that allow components to move with respect to each other. There are two types of bearings: contact and non-contact. Contact-type bearings have mechanical contact with equipment, which includes sliding, rolling, or flexural bearings. Non-contact bearings include liquid, air, mixed phase, and magnetic bearings. The lack of mechanical contact eliminates static friction.

Bearing (mechanical)

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