. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . s, in the center, is placed a doubleconed expansible ring, called a wedgering, numbered 4, the sides of whichare beveled to fit the inner sides of thewall rings. This wedge ring is put inplace under tension, and its effort to ex-pand presses the two wall rings laterallyagainst the cone sides of the snap ringnumbered 1. This prevents any lateralwear occurring in all the rings. A widering numbered 3 interlocks into eachsnap ring, and completes the packing, andalso performs two important functio
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . s, in the center, is placed a doubleconed expansible ring, called a wedgering, numbered 4, the sides of whichare beveled to fit the inner sides of thewall rings. This wedge ring is put inplace under tension, and its effort to ex-pand presses the two wall rings laterallyagainst the cone sides of the snap ringnumbered 1. This prevents any lateralwear occurring in all the rings. A widering numbered 3 interlocks into eachsnap ring, and completes the packing, andalso performs two important functions,first, it carries the snap rings across portswhile the engine is drifting, and, second,it keeps the snap rings parallel and ofequal diameter, so that the wide ring andthe two snap rings form a very flexibleand wide packing ring. All the rings arefree to turn round. The degree of angle on the cones, itwill be observed, is much greater on thedouble tapered wedge ring than on thesnap rings. These angles are so calculatedthat while the pressure is underneath allthe rings, the leverage of the double. FIG. 3. IlSTOX \AI.\I-; Z KING. tapered wedge ring pressing the solidwall rings against the cones of the snaprings, is just sufticicnt to prevent the snaprings from further expansion 1)ut not suf-ficient to reduce the snap rings in dia-meter. In brief the pressure of the snaprings against the valve chamber dependsentirely upon the angles, and it can, there-fore, be regulated to any desired degree,and completely prevent an cxcesive degree 220 KAILWAV AND LOCOMOTIVE ENGINEERING July, 1917. of pressure by the rings against the valvechamber. Under these conditions it will be seenthat the rings will remain at the smallestdiameter of the cage, so that it is veryimportant that the valve be put into a truecage to begin with, in which case thecage will retain its exact diameter. In regard to lubrication the corrugatedsurface of the wide ring furnishes meansto retain in the furrowed spaces an
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
