rotating member that acts as storage reservoir for energy when work is not consumed at as fast a rate as the power is supplied.

usually made of leather, rubber, or woven fabrics; flat and thin; pulleys nearly cylindrical with smooth surfaces.

Used to connect shafts as much as 9 m (30 ft) apart; Run economically at speeds as high as 23 m/s (4500 fpm);

made with V-shaped cross section to be used on grooved pulleys

Used for connecting shafts which are less than 5 m (15 ft) apart; Speed ratios up to 7 to 1; Speed is up to 25.5 m/s (5000 fpm);

basically flat belts with series of evenly spaced teeth on the inside circumference, thereby combining the advantages of flat belts with excellent traction of gears and chains.

flexible connectors that are nearly circular in cross section and made up of manila, hemp, cotton, or wire.

Run on either grooved pulleys or drums with flanges; Used for connecting shafts up 30.5 m (100 ft) apart; and Operate at a speed of less than 3 m/s (600 fpm)

composed of metallic links jointed together, and run on either sprockets or drums either grooved, notched, or toothed, to fit the links of the chain.

Used for connecting shafts less than 5 m (15 ft) apart; Speed depends on the type of chain; and Roller and silent chains may operate at speeds up to 13 m/s (2500 fpm).

used to transmit power through sprockets rotating in the same plane

Pulleys are of the same sense or direction of rotation

Pulleys are in opposite directions of rotation

used with electric motors to drive a great number of components such blowers, compressors, machine tools, etc.

made up of two kinds of links: roller links and pin links alternately spaced throughout the length of the chain

manufactured to the specifications in the American National Standard for precision power transmission roller chains, attachments, and sprockets

These roller chains and sprockets are commonly used for the transmission of power in industrial machinery, machine tools, motor trucks, motorcycles, tractors, and similar applications.

similar in form and construction to standard roller chains but do not conform dimensionally to standard chains

Some sizes of these chains are still available from the originating manufacturers for replacement on existing equipment;

these are not recommended for new installations.

-          These roller chains are like standard roller chains, except that their link plates have twice the pitch of the corresponding standard-pitch chain

These roller chains are especially useful for low speeds, moderate loads, or long center distances.

a machine member that supports another part that rotates, slides, or oscillates in or on it.

a bearing where surfaces are non-conformed and motion is primarily rolling; it composed of rolling elements interposed between outer and inner rings.

a bearing that permits constrained relative motion of rigid parts; lubricant is generally inserted or supplied between the mating surfaces to reduce friction and wear, and to carry away the heat generated.

are surfaces that do not conform to each other very well as in the rolling-element bearings.

study of lubrication, friction, and wear of moving or stationary parts.

  process of separating relatively moving parts or elements for the purpose of reducing the friction, wear, and heating of parts.

any substance, when inserted between moving surfaces, reduces friction, wear, and heating of the surfaces; and provides smooth running and satisfactory life for machine elements

  the measure of the resistance to flow of the fluid or the property that resists shearing of the fluid or lubricant.

the ratio of the fluid layer shearing stress to that of its shear strain rate.

  the ratio of absolute viscosity and the density of the fluid or lubricant.

a particular fluid layer is the ratio of velocity to that of its perpendicular distance from the stationary surfaces.

a tin or lead base alloy that is used as bearing material.

rolling element bearing that uses spherical balls as rolling elements

rolling element bearing that uses cylindrical rollers as rolling elements

a bearing that supports radial loads and furnishes lateral support to rotating shaft.

a bearing that primarily guides the motion of a machine member without specific regard to the direction of load application.

a bearing that carries a load collinear to the axis or a bearing designed to support axial load of the rotating element.

a bearing in which two surfaces are flat and nearly parallel and the relative motion is translation.

the inside cylindrical part, usually a rotating or an oscillating member

the surrounding shell or the bushing, may be stationary as on the line shaft bearing or moving as on a crankpin.

a bearing with the angle of contact of the bushing or bearing with the journal is 360^o.

a bearing with angle of contact of the bushing or bearing with the journal is 180^o or less, 120^o the common value.

a journal bearing where the radius of the journal is less than the radius of the bushing or bearing.

where the radii of the journal and the bushing are equal; it must be a partial bearing and the journal must run eccentric with the bushing in order to provide space for the lubricant.

          refers to the thickness of the space allowed for the lubricant that separates the parts having relative motion.

a partial journal bearing where the line of action of the load or bearing reaction is bisecting the arc of the partial bearing.

the one where the line of action of the load is passing to one side of the center

    ball or roller bearings used as substitute for a hydrodynamic or hydrostatic fluid film to carry an impressed load without wear and with reduced friction.

  also called as “Anti-friction Bearing” because of greatly reduced starting friction.

a rolling contact bearing, which is the most common anti-friction bearing application, with ribbon-type separator and sealed-grease lubrication used to support a shaft with radial and thrust loads in rotating equipment.

also known as Condrad-type ball bearing, is a bearing in which the balls are assembled by the eccentric displacement of the inner ring.

a bearing that has slots or notches that permit the assembly of more balls, giving a bearing of larger radial load capacity. This bearing is used where the load is principally radial.

a ball bearing that compensates for angular misalignments that arise from shaft or foundation deflection or errors in mounting.

   the one that is intended to take heavy thrust loads.

  the one that is similar to single-row ball bearing, except that each ring has two grooves. The two rows of balls give the bearing a capacity somewhat less than twice that of a single-row.

the one in which the contact is a line instead of a point as in ball bearing, which results in a greater area carrying the load and in a larger radial capacity.

the one with spherical rollers running in a double-grooved inner ring, has curved outer ring that looks much like the outer ring of a self-aligning ball bearing.

  a cylindrical roller bearing that has no retainer to hold the rollers in alignment. An application of this is a universal joint with needle bearing.

in which the rolling elements are frustums of cones, so mounted in the races that all of the surface elements and the axes intersect at a point on the axis of the shaft. It is capable of carrying sustainable radial and thrust loads.

  an angular contact bearing with rollers instead of balls. It is a self-aligning bearing and has a high load capacity.

1. This ball bearing is also known as the “Conrad” type or “Deep-groove” type.

1. It is probably the most widely used ball bearing and is employed in many modified forms.

1. This type is not self-aligning; that accurate alignment between shaft and housing bore is a requirement.

1. This ball bearing type is designed primarily to carry radial loads.

1. designed for combined radial and thrust loads where the thrust component may be large and axial deflection must be confined within very close limits.

1. applied either in pairs (duplex) or one at each end of the shaft, opposed, provided that it is not used for a pure thrust load in one direction.

1. two single-row angular-contact bearings built as a unit with the internal fit between balls and raceway fixed at the time of bearing assembly. The fit is not dependent upon mounting methods for internal rigidity.

1. These bearings usually have a known amount of internal preload built in for maximum resistance to deflection under combined loads with thrust from either direction.

1. This bearing can be used to compensate for an appreciable degree of misalignment between shaft and housing due to shaft deflections, mounting inaccuracies, or other causes commonly encountered.

  the unit of life of bearing in terms of revolution.