barcode reader library vb.net Classification of Rolling Element Bearings in Software

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623 Classification of Rolling Element Bearings
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Rolling element bearings may be classified according to the applied load The bearing may be subjected to an axial load, radial load or a combination of both as can be seen in Figure 63 There is also the possibility of a steady-state applied load and a dynamic load Another way to classify rolling element bearings is by the shape of the rolling element as shown in Figure 64 and Figure 65 The most common type of rolling element bearings are ball bearings Generally, ball bearings are easy to manufacture, and therefore have a widespread usage Figure 66 shows some of the most
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Seal or shield groove Shoulders Seal or shield notch Corner radius Inner ring raceway Outside diameter Bore Inner ring Inner ring land
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Inner ring face Outer ring face
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Separator Outer ring raceway Outer ring land Outer ring
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Fig 62: The cross-section of a ball bearing [2]
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common types of ball bearings that are available The deep groove ball bearing, also known as the Conrad bearing, has the ability to support both radial and thrust or axial loads The filling notch type has a higher load capacity, but the thrust capacity is reduced because of the filling notch in the inner and outer rings The angular-contact bearing can support a unidirectional thrust load with a contact angle ranging from 15 to 40 [1] Both the self-aligning types of ball bearings are able to take a certain level of misalignment with the internal self-aligning type slightly superior in this aspect However, the external self-aligning type is better in terms of load capacity [1] Double-row bearings are able to carry heavier radial and axial
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Classification by the applied load
Radial bearings
Axial bearings
Combined bearings
Fig 63: Classification of rolling element bearings based on the direction of the applied load [5]
Rolling Element, Hydrodynamic and Hydrostatic Bearings
Classification by the shape of rolling element
Ball bearings
Roller bearings
Cylindrical
Taper
Needle
Taper spherical
Spherical (Barrel)
Fig 64: Classification of rolling element bearings based on the shape of the rolling element [5]
loads Thrust bearings are generally available for a variety of sizes, but the capability is limited only to thrust loads In addition, there are also several other less common types of ball bearings such as magneto bearings, miniature ball bearings and duplex bearings [6] Shields may also be used in certain applications to avoid particles, dirt or contaminations from entering the raceways and causing damage by erosion Sealed bearings are lubricated with grease and are intended to be lubricated life long [4] Similar to ball bearings, roller bearings have different arrangements for different applications and requirements as shown in Figure 67 Cylindrical or straight roller bearings provide support for purely radial loads with a certain freedom of axial movement This type of roller bearing is suitable for moderate to high radial load and high-speed operations Although commonly known as straight or cylindrical rollers, they are usually made slightly barrel shaped to reduce stress concentration [6] Spherical roller bearings are generally employed in heavy-duty machines because they are capable
Fig 65: Forms of rolling elements [5]
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(a) Deep groove
(b) Filling notch
(c) Angular contact
(d ) Shielded
(e) Sealed
+ + +
(f ) External self-aligning
(g) Double row
(h) Self-aligning
(i ) Thrust
(j ) Self-aligning thrust
Fig 66: Various types of ball bearings [4]
of supporting radial and axial loads especially in the case of a thrust arrangement [1] They are also able to take a certain amount of misalignment but are more difficult to lubricate and operate at low speeds Tapered rollers that are shaped as truncated cones are able to carry heavy loads in both the axial and radial directions if properly aligned However, as in spherical rollers, tapered rollers are not suitable for high speed applications
(f )
Fig 67: Types of roller bearings: (a) straight roller, (b) spherical roller, thrust, (c) tapered roller, thrust, (d) needle,
(e) tapered roller and (f) steep-angle tapered roller [4]
Rolling Element, Hydrodynamic and Hydrostatic Bearings
624 Application of Rolling Element Bearings
Most of the types of bearings discussed so far are usually not employed in precision and ultra-precision applications although some precision machines do use rolling element bearings and hydrodynamic bearings The only type of bearing that is used in ultra-precision machines especially for guide ways is the needle bearing The needle bearing is used with an inverted vee-shaped guideway in Toshiba ultra-precision grinding machines as shown in Figure 64 (b) The needle bearing is actually classified as a type of roller bearing with the exception that the length of the rollers is not less than 12 times their diameter [7] The main desired characteristic of the needle bearing is that it is capable of a high load capacity within a very small radial dimension For most applications, the separator and the inner ring are omitted and the shaft surface is hardened and ground to serve as the raceway However, Table 61
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