File:Electric locomotive haulage in and about mines (1913) (14735230376).jpg

Identifier: electriclocomoti00newt (find matches)
Title: Electric locomotive haulage in and about mines
Year: 1913 (1910s)
Authors: Newton, Leonard Victor
Subjects: Electric locomotives Mine railroad cars Electric railroads Theses
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Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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rotection against mechanical injury they are covered with tapefilled with an insulating compound. The windings at boti ends ofthe armature are covered with heavy canvas dressing securely boundinto place. Heavy binding wire imbedded flush with the core sur-face Is used to hold the coils securely in the slots. The commutators are rrade of hard drawn copper bars, eachbar being insulated from the other by mica, and clamped togetherby V-shaped clamping rings properly insulated by removable mouldedmica sections. Carbon brushes are employed on most of the modern motors,the sliding carbon type being the favorite. A shunt of flexiblecopper wire from the brush to the holder is advisable so as toprevent heating when a heavy current is used. ( See Plate 24). it is hardly necessary to discuss at any great lengtharmaure bearings. The two forms of bearings now in use are theball bearing and the old style babbit bearing. The bail bearingarmature is without doubt the better and more efficient one, and
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PLATE 23. 15 although a little more expensive 1 believe its use is warrantedwhen the high speed of the armature and the attendant frictionare considered. The plain babbit bearing consists of a cast ironframe with a babbit lining, proper provisions being made for oiling.Care should be taken in the designing of a babbit bearing to pro-vide a sufficient thickness of babbit metal so that it will notbe worn down very rapidly, or so that should a hot box occur,through the negligence of the operator, the entire beari g willnot be melted out. ( See Plate 25). Cast steel is used in the manufacture of the gears andpinions used in locomotive construction. The gears are of thesplit type securely bolted together over the axle key. The pinionsare made of steel cut from a solid forged blank and tempered aftercutting. They are keyed to the armature shaft and held in positionby a large lock nut. All gears and pinions are encased in a malle-able iron case divided into two parts on a plane passing throu

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