codeproject vb.net barcode generator FIGURE 16.7 Schematic view of a flanged sleeve coupling. in Software

Drawing EAN 13 in Software FIGURE 16.7 Schematic view of a flanged sleeve coupling.

FIGURE 16.7 Schematic view of a flanged sleeve coupling.
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COUPLINGS 16.11
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FIGURE 16.8 (a) Flexible-disk coupling; (b) cross section. (Rexnord, Inc., Coupling Division.)
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16.3.2 Chain, Grid, and Beam Couplings The chain coupling of Fig. 16.11 consists of two sprockets joined by an endless doubleroller chain or inverted-tooth silent chain. This type of coupling will accommodate small amounts of angular, axial, and radial misalignment, which is provided by clearances between interfacing surfaces of the component parts. For maximum service life, chain coupling sprockets should have hardened teeth. The coupling should be lubricated and enclosed in a greasetight case. Chain couplings can be assembled by using unhardened sprockets and operated without lubrication or a cover. This can be hazardous and can result in injury to personnel as well as a short coupling service life. This author has seen many such worn-out couplings. The availability of chain couplings is very good worldwide. Most manufacturers publish horsepower ratings to aid in proper coupling selection. In the grid coupling (Fig. 16.12) the gears are separated by a specific minimum distance that allows for misalignment (Fig. 16.13). Large axial misalignment is
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COUPLINGS 16.12
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FIGURE 16.9 Lightly damped resonance curve showing forbidden speed range 0.6nc < nc < 1.4nc.
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accomplished by sliding of the gear teeth in the rather long grid area. This coupling requires a guard (which is supplied) and lubrication. The beam coupling is a single bar of metal cut as shown in Fig. 16.14 so that a continuous helical coil is produced. This coupling is torsionally rigid and free from backlash and provides constant velocity. Two designs exist for this type of coupling, one for maximum misalignment, the other for maximum torque (for the package size where axial movement is not a requirement). This coupling requires no lubrication. Speeds to 25 000 rev/min are possible depending on the coupling size.
16.3.3 Diaphragm and Hydraulic Couplings As the name suggests, diaphragm couplings are made of a thin diaphragm or multiple thin diaphragms (see Fig. 16.15). Normally the diaphragms are made of metal. The diaphragms may be straight-sided, contoured, tapered, or convoluted; they may have various cutouts in them or take on many other forms. This coupling is connected to one shaft at the periphery [outer diameter (OD)] while the inner diameter (ID) is connected to the shaft or to a spacer piece, which may connect to another
FIGURE 16.10 Link coupling. (Eaton Corp., Industrial Drives Operation.)
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COUPLINGS 16.13
COUPLINGS
FIGURE 16.11 (a) Silent-chain coupling; (b) roller-chain coupling. (Morse Industrial Products, Borg-Warner Corp.)
diaphragm(s). This coupling is most often used in pairs (two flex elements), which converts parallel misalignment to angular misalignment between two flex elements. Misalignment is accommodated by stretching (straight, contoured, or tapered diaphragms or unrolling convoluted diaphragms) the diaphragm material. This type of coupling requires no lubrication and is considered torsionally rigid. The hydraulic coupling consists of two sleeves, one with a tapered OD and one with a tapered ID, which slide over one another, as shown in Fig. 16.16. Oil is forced, under pressure, between the two sleeves to allow the outer sleeve to be positioned at a predetermined position on the inner sleeve. The pressure is released, and the outer sleeve firmly compresses the inner sleeve and shafting. In larger couplings, oil is also forced into a piston chamber to force the outer sleeve into position. To remove the coupling, the area between the sleeves is repressurized, and the outer sleeve can be slid away, releasing the coupling.
16.3.4 Gear Couplings Double-engagement gear couplings, as shown in Fig. 16.17, transmit more power per unit volume and unit weight than any other flexible coupling design, because of their relatively small OD (compared with other types of similar horsepower). The basic design consists of two gear-type hubs (similar to spur gears) loosely connected by an internalspline sleeve, which could be one piece or two internal-spline mating flanges bolted together. Clearance between the mating teeth in the hub and the sleeve allows this type of coupling to absorb angular, parallel,
FIGURE 16.12 Metallic grid coupling with cover removed to show grid detail. (Falk Corp.)
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