codeproject vb.net barcode generator FIGURE 21.14 Cup packing for single-acting cylinder. in Software

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FIGURE 21.14 Cup packing for single-acting cylinder.
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SEALS 21.14
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BEARINGS AND LUBRICATION
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FIGURE 21.15 U-seals for a double-acting piston.
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Rod scrapers are used on piston rods of hydraulic cylinders that are exposed to harsh environments. The purpose is to exclude mud, dust, and ice from the cylinder. A typical rod scraper is composed of a polyurethane element bonded to a metal shell which is pressed into the end cap of the cylinder. Molybdenum disulfide is sometimes added to the polyurethane to reduce friction. A rod scraper added to the end cap of a cylinder is shown in Fig. 21.16. The sealing lip is pointed outward to remove foreign material when the piston rod is retracted. The chief use of the V-ring packing (Fig. 21.17) is for sealing piston rods or reciprocating shafts, although it can also be used to seal pistons. The ability to seal fluids under pressure depends on the type of packing material and number of packings used. The V-ring packing is considered superior to other lip types for sealing high pressures, especially above 50 000 psi (345 N/mm2). The V shape of the packing is obtained through the adapters that support the rings. Fluid pressure then expands the packing against the shaft and housing to seal
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FIGURE 21.16 Rod scraper on piston rod.
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FIGURE 21.17 V-ring packing for a reciprocating shaft.
the fluid. A continuous packing provides better sealing than a series of split rings, although the latter are easier to install and remove.
21.3.3 Piston Rings Piston rings for automotive engine applications are made of gray cast iron. The rings are used to seal gases in the cylinder and to restrict oil to the crankcase. Piston rings must be split for assembly over the piston. This requires shaping the ring so that it will provide a uniform radial force against the cylinder wall. Piston ring manufacturers have developed methods of attaining this objective.
REFERENCES
21.1 Leonard J. Martini, Sealing Rotary Shafts with O-Rings, Machine Design, May 26, 1977, pp. 97 99. 21.2 Bert Robins, Radial Lip Seals Are Two Too Many Power Transmission Design, October 1982, pp. 73, 74. 21.3 L. I. Ezekoye and J.A. George, Valve Packings that Don t Leak, Machine Design, Jan. 20, 1977, pp. 142, 143. 21.4 Wes J. Ratelle, Seal Selection: Beyond Standard Practice, Machine Design, Jan. 20, 1977, pp. 133 137.
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SEALS
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Source: STANDARD HANDBOOK OF MACHINE DESIGN
FASTENING, JOINING, AND CONNECTING
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FASTENING, JOINING, AND CONNECTING
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
Source: STANDARD HANDBOOK OF MACHINE DESIGN
BOLTED AND RIVETED JOINTS
John H. Bickford
Vice President, Manager of the Power-Dyne Division, Retired Raymond Engineering Inc. Middletown, Connecticut
22.1 SHEAR LOADING OF JOINTS / 22.6 22.2 ECCENTRIC LOADS ON SHEAR JOINTS / 22.13 22.3 TENSION-LOADED JOINTS: PRELOADING OF BOLTS / 22.18 22.4 BOLT TORQUE REQUIREMENTS / 22.31 22.5 FATIGUE LOADING OF BOLTED AND RIVETED JOINTS / 22.31 22.6 PROGRAMMING SUGGESTIONS FOR JOINTS LOADED IN TENSION / 22.38 REFERENCES / 22.40
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