Download BEARING DESIGN AND FITTING (NEW REVISED EDITION) by Ian Bradley PDF

By Ian Bradley

ISBN-10: 0852424639

ISBN-13: 9780852424636

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Extra info for BEARING DESIGN AND FITTING (NEW REVISED EDITION)

Sample text

A method, now widely used for ensuring a continuous supply of oil to the bearings of small electric motors, is to provide an oil reservoir surrounding the bearing and to form a gap in the upper surface of the bush; the reservoir is packed wit’, wool yarn, maintained in contact with the exposed area 34 PLAIN HEARlNGS m Bearinq Bush Wiiks 30. Lubrication electric motor. FIG. system of the Crompton Parkinso! n of tlae shaft by means of a light spring fitted to the oiling nipple. An example of this oiling system is illustrated in Fig.

Annular grease grooves of the form illustrated in Fig. 44A are fitted with a minimum of running clearance as an alternative means of retaining the htbricant, but this arrangement is more effective if used in combination with a felt pad, as shown in Fig. 44~. The labyrinth form of grease seal acts well in practice, and an example of this device in common use is illustrated in Fig. 4~~ BALL THRUST BEARINGS Single-rowThsts. As shown in Fig. 46~, these have a single row of balls carried in a perforated cage and the two races are formed with curved ball tracks.

The separation of metal particles from the bearing surfaces, or the entry of dirt or swarf, may also cause local breakdown of the oil film leading to general bearing failure. The possibility of failure, due to misalignment of the bearings, is somewhat lessened by the use of the softer bearing materials, which also allow particles of grit or metal to become embedded in their surface and thus rendered less harmful to the oil film. THE 32 PLAlN BEARINGS to do so but rather to finish the shaft to fit the bearing when in place.

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