By Herman Haeder
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Extra info for A Handbook On the Steam Engine: With Special Reference to Small and Medium-Sized Engines ; for the Use of Engine Makers, Mechanical Draughtsmen, Engineering Students, and Users of Steam Power
129131. ORANK SHAFT BEARINGS. It will be noted in fig. 128 that the adjusting wedge Is shown with the small end downwards ; it is generally better to have all adjusting wedges with the large end downwards, as then, if the bolt jars wedge will work down, and not jamb as it might do when put in the other way. The crank shaft or main bearing, being a very important part of the engine, requires special care both in design and construction. The adjustment of bearings with the brasses in three or more parts loose, the by means of wedges placed so as to take up the wear in definite advantages if skilfully handled, but may lead and prove to be far worse, than the ordinary bearing with two-part brasses, if badly handled.
B length of pin in inches. P = maximum then The stress k made M = P ~ = Wk = may per square inch. , -1 dWfe. Fig. 175. be taken as from 6,720 to 11,200 Ibs. or 3 to 5 tons In order to avoid heating, the crank pin is usually larger than given by the above formula. Let p p -j the pres- sure per square inch in Ibs. on the surface of the crank pin v = ~= 1 speed of crank pin surface in feet 1. miatrtc, then for p ^ 1,130 Ibs. per square inch vp < 845. workmanship we may go higher see table on ordinary workmanship With very high class : page 63.
72, 73. 73. Fig. 74 shows the connection between the part of the frame with the bored out guides and the main crankshaft-bearing, the straight line shown in the figure, makes the pattern simple venting the core and for getting forms ; the dotted circles show the holes for it out ol the casting. FRAMES I'OIl Fig. 75. TABLE 4. Engines. MEDIUM AND LAKGE ENGINES. 27 Pig. 70. Feet for supporting Girder Frames (Figs. 75 77). DETAILS OF STEAM ENGINES. * TABLE Engines. 5. Main Bearing Foot (Fig. 78). FRAMES FOR MEDIUM AND LARGE ENGINES.
A Handbook On the Steam Engine: With Special Reference to Small and Medium-Sized Engines ; for the Use of Engine Makers, Mechanical Draughtsmen, Engineering Students, and Users of Steam Power by Herman Haeder