. American engineer and railroad journal . lculation. For a speed of 50 miles per hour the centrifugal force ofthe car under consideration will be found to be 14,517 the equation 87,000 tga= 14,517. a will be found to be9 deg. 30 min. Subtracting from this the angle fi, which isequal to the angle of elevation of the outside rail, or 3 deg.,there remains 6 deg. 30 min. The contact surfaces of thecenter plates are generally about 29 ins. above the rail; sub-tracting this from ft. leaves 41% Ins. from the commoncenter of gravity to the contact surfaces. This multipliedby the tangent
. American engineer and railroad journal . lculation. For a speed of 50 miles per hour the centrifugal force ofthe car under consideration will be found to be 14,517 the equation 87,000 tga= 14,517. a will be found to be9 deg. 30 min. Subtracting from this the angle fi, which isequal to the angle of elevation of the outside rail, or 3 deg.,there remains 6 deg. 30 min. The contact surfaces of thecenter plates are generally about 29 ins. above the rail; sub-tracting this from ft. leaves 41% Ins. from the commoncenter of gravity to the contact surfaces. This multipliedby the tangent for 6 deg. 30 min. gives the deviation ofthe line of pressure from the center line of the car in theplane of the center plates contact surfaces, and will be foundto be 4% ins. Twice that amount, or 9% ins., will thereforebe the necessary diameter of the contact surfaces of the cen-ter plates, unuer the conditions named. The writer has designed a set of center plates based uponthese calculations, illustrated in Fig. 2. The diameter of the. Fig. 4 bearing surfaces is 9% ins., and the outside width is 12% actual bearing surface of each is 50 sq. ins., and theapproximate static pressure is 870 lbs. per square inch. Theguiding surfaces are made sloping sufficiently to enable thesecenter plates to be reproduced either as castings or in pressedsteel. The concave fillets in the truck center plate are of alarger radius than the corresponding corners of the body cen-ter plate, the object being that if the car body is jolted to oneside, the body center plate will commence to climb up onthe fillet in the truck center plate, whereby the side thrustwill be expended before the guiding surfaces of the centerplates come together with the force of a blow, on the sameprinciple as the fillet of a wheel flange is made of a largerradius than a corner of the rail head. The clearance betweenthe center plates is only 116 in. at the hub. while it is % the rim, and the guiding is therefore
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
