 Home
 Products
 Integration
 Tutorial
 Barcode FAQ
 Purchase
 Company
barcode vb.net 2010 CLUTCHES AND BRAKES 8.38 in Software
CLUTCHES AND BRAKES 8.38 Recognize EAN13 In None Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications. Paint EAN13 In None Using Barcode generator for Software Control to generate, create EAN13 image in Software applications. MACHINE ELEMENTS THAT ABSORB AND STORE ENERGY
Recognizing EAN / UCC  13 In None Using Barcode decoder for Software Control to read, scan read, scan image in Software applications. Creating UPC  13 In C# Using Barcode creation for .NET framework Control to generate, create EAN13 image in .NET framework applications. FIGURE 8.20 Cone clutch; A, cup; B, cone; C, shifting groove; D, spring; E, friction lining; = cone angle. EAN 13 Drawer In .NET Framework Using Barcode maker for ASP.NET Control to generate, create UPC  13 image in ASP.NET applications. Printing GTIN  13 In Visual Studio .NET Using Barcode maker for .NET Control to generate, create EAN13 image in .NET applications. FIGURE 8.21 Cone brake; = cone angle.
Drawing UPC  13 In Visual Basic .NET Using Barcode creation for VS .NET Control to generate, create EAN13 image in .NET applications. Make Bar Code In None Using Barcode printer for Software Control to generate, create barcode image in Software applications. Downloaded from Digital Engineering Library @ McGrawHill (www.digitalengineeringlibrary.com) Copyright 2004 The McGrawHill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Code39 Maker In None Using Barcode encoder for Software Control to generate, create ANSI/AIM Code 39 image in Software applications. Generating EAN13 In None Using Barcode printer for Software Control to generate, create GS1  13 image in Software applications. CLUTCHES AND BRAKES 8.39
Creating Data Matrix In None Using Barcode maker for Software Control to generate, create ECC200 image in Software applications. Draw Barcode In None Using Barcode generator for Software Control to generate, create bar code image in Software applications. CLUTCHES AND BRAKES
Paint 2 Of 7 Code In None Using Barcode generator for Software Control to generate, create Uniform Symbology Specification Codabar image in Software applications. Generating DataMatrix In Visual Basic .NET Using Barcode creator for VS .NET Control to generate, create Data Matrix 2d barcode image in Visual Studio .NET applications. FIGURE 8.22 Elementary quantities on conical surface.
Creating European Article Number 13 In None Using Barcode generator for Word Control to generate, create EAN / UCC  13 image in Office Word applications. UPC A Generation In None Using Barcode creator for Online Control to generate, create UPCA Supplement 2 image in Online applications. F = 2 T= 2 sin
Creating European Article Number 13 In .NET Framework Using Barcode encoder for Visual Studio .NET Control to generate, create European Article Number 13 image in .NET applications. EAN / UCC  14 Generation In Java Using Barcode printer for Java Control to generate, create GS1128 image in Java applications. pr dr
Barcode Encoder In Java Using Barcode generation for Eclipse BIRT Control to generate, create bar code image in BIRT reports applications. Paint Bar Code In Visual C#.NET Using Barcode creator for .NET framework Control to generate, create bar code image in .NET framework applications. d/2 D/2 (8.50) (8.51) fpr 2 dr
Before these integrations can be carried out, assumptions have to be made about the way in which contact pressure p and friction coefficient f vary across the active face of the cone. In what follows, the variations of f with pressure and rubbing velocity have been neglected. Only the variation in contact pressure p is used. ContactPressure Distribution. When the friction surfaces are new, the pressure is fairly uniform across the clutch face. But after an initial wearin period, the pressure Downloaded from Digital Engineering Library @ McGrawHill (www.digitalengineeringlibrary.com) Copyright 2004 The McGrawHill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. CLUTCHES AND BRAKES 8.40
MACHINE ELEMENTS THAT ABSORB AND STORE ENERGY
accommodates itself to a uniform rate of wear. We assume that the wear rate is proportional to the frictional work per unit area, that is, to fpV. If the variations in f are neglected, then the wear rate is proportional simply to pV, the product of contact pressure and rubbing velocity. We can write pV = 2 r p = constant (8.52) Thus across the face the product pr is constant, implying that pmax occurs at the inner radius d/2. In general, p= pmax d 2r (8.53) A typical pressure distribution is shown in Fig. 8.23. Torque Capacity. By substituting for p from Eq. (8.53) in Eq. (8.51) and carrying out the integration, we find the torque capacity T: T= f pmaxd (D2 d2) 8 sin (8.54) Actuating Force. Equation (8.50) can be integrated to yield F= pmaxd (D d) 2 (8.55) The last two equations can be combined to produce the useful result T= Ff (D + d) 4 sin (8.56) The last equation indicates that for the uniformwear assumption, the mean friction radius is simply the average radius. Moment Equation for Brake Lever. The axial actuating force for the cone brake shown in Fig. 8.21 can be found by summing moments on the lever about the pivot point O and solving for F. Thus F= Q a (8.57) FIGURE 8.23 Contactpressure distribution on face of cone after wearin period (for constant f). 8.7 DISK CLUTCHES AND BRAKES
8.7.1 Multidisk Clutches and Brakes The multidisk clutch in Fig. 8.24 is intended for wet operation using an oil coolant. Similar clutches are built for dry operation. Disk brakes are similar in construction Downloaded from Digital Engineering Library @ McGrawHill (www.digitalengineeringlibrary.com) Copyright 2004 The McGrawHill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. CLUTCHES AND BRAKES 8.41
CLUTCHES AND BRAKES
to the disk clutch. In either case, an axial force is applied to the flat surfaces of the elements to produce tangential frictional forces.Typically not more than the outer 40 percent of the radius is used. The ratio of inside to outside diameters may be as high as 0.80/1. ContactPressure Distribution. The reasoning used to establish pressure distribution on the annular clutch or brake plate is the same as that used for cone clutches and brakes. After an initial wearin period, the pressure distribution accommodates itself to a constant rate of wear across the active portion of the disk (Fig. 8.25). Equations (8.52) and (8.53) apply here also. Axial Actuating Force. For a given set of dimensions and a permissible contact pressure, the corresponding actuating force is given by Eq. (8.55), which was developed for cone clutches and brakes. Torque Capacity. For this pressure distribution, the torque capacity is 1 T = [ fpmaxd(D2 d2)Np] 8 (8.58) Although the torque equation could be derived independently, it can also be derived directly from Eq. (8.54) by setting the cone angle = 90 and inserting Np, the num FIGURE 8.24 An oilactuated multipledisk clutch for enclosed operation in an oil spray or bath. (Twin Disc, Inc.) FIGURE 8.25 A friction member of a multipledisk clutch or brake with the pressure distribution for uniform wear. Downloaded from Digital Engineering Library @ McGrawHill (www.digitalengineeringlibrary.com) Copyright 2004 The McGrawHill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.

