codeproject vb.net barcode generator FIGURE 21.4 Cross section of radial lip seal. in Software

Encoding EAN 13 in Software FIGURE 21.4 Cross section of radial lip seal.

FIGURE 21.4 Cross section of radial lip seal.
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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.
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21.2.3 Face Seals Whereas a radial lip seal contacts the shaft circumference, a face seal acts against a surface perpendicular to the shaft axis. The seal may be mounted in a housing and seal against a shoulder or collar on the shaft. The seal also may be mounted on the shaft and seal against a surface on the housing. Some elastomeric face-sealing elements are loaded by mechanical springs, whereas others are not. Elastomeric face seals (Fig. 21.5a) are used to retain lubricants. For high-speed applications, the lubricant should be on the side where centrifugal force throws the lubricant into the sealing area. These seals have the disadvantage of requiring rather precise location with respect to the sealing surface in order to provide the proper force on the seal. The sealing surface must be flat and smooth, with a surface finish of 10 to 20 in (0.25 to 0.50 m). Less rigid control of surface flatness is required for low speeds. Mechanical face seals are used in situations where a radial lip seal or elastomeric face seal will not be satisfactory. Abrasive conditions, such as those encountered by earth-moving machinery and mining machinery, may dictate the use of a mechanical face seal. A mechanical seal is frequently used in the automotive coolant pump (Fig. 21.5b), in which the pressure is relatively low. Here, the stationary spring-loaded seal ring contacts a flat surface on the rotor. If the seal in Fig. 21.5b were used with high-pressure fluid, a high axial sealing force would result. Friction between the rotor and stator could possibly cause overheating of the seal elements. Consequently, a balanced mechanical face seal, such as in Fig. 21.5c, is used for higher pressures. These seals are proportioned so that much of the force due to pressure is balanced. This leaves a small net force to provide contact between rotor and stator. Another type of face seal, Fig. 21.6, is used to seal lubricants in rotating elements of machines that operate in environments where water, mud, or dust must be excluded. The seal consists of two hardened steel rings with lapped sealing surfaces that are forced together by surrounding elastomeric rings. The seal surfaces are tapered so that the point of contact moves inward as wear occurs. The seal rings do not contact the shaft that they surround; instead, one seal ring is driven by the rotating component through the elastomeric ring.
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21.2.4 Metal Sealing Rings Cast-iron sealing rings are used in hydraulic applications where oil must be introduced through a rotating shaft (Fig. 21.7). A typical application is to operate a clutch in an automatic transmission for a motor vehicle. Ring cross-sectional dimensions are similar to those for engine piston rings of the same outside diameter. Information on designing to accommodate these rings is provided in SAE J281 (Sept. 1980) and SAE J1236 (May 1995).
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21.2.5 Compression Packings The stuffing box (Fig. 21.8) is used to seal fluids under pressure with either rotating or reciprocating shafts. Sealing between the packing and the shaft occurs as a result of axial movement of the gland when the nuts are tightened. Friction between the packing and the shaft causes wear, and so periodic tightening of the nuts is required.
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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.
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FIGURE 21.5 Face seals. (a) Housing-mounted elastomeric seal; (b) mechanical seal for engine coolant pump; (c) balanced mechanical seal.
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