4-18-2011v2

4-18-2011v2 - DESIGN OF ENGINEERING SYSTEMS I April 18,...

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Unformatted text preview: DESIGN OF ENGINEERING SYSTEMS I April 18, 2011 Power Screw and CNC DESIGN OF ENGINEERING SYSTEMS I April 18, 2011 Power Screw and CNC DESIGN OF ENGINEERING SYSTEMS I April 18, 2011 Functions exert forces, or torques and absorb energy Spring Design Figures from Wiki Helical or coil springs Compression springs A spiral torsion spring A spiral torsion spring http://www.allpar.com/cars/suspensions.html torsion bar spring DESIGN OF ENGINEERING SYSTEMS I April 18, 2011 Functions exert forces, or torques and absorb energy Spring Design DESIGN OF ENGINEERING SYSTEMS I April 18, 2011 Shear stress intensity at any radius r: For a solid round rod of diameter d, J is the polar moment of inertia of the cross section , Torsion Bar Springs = ?? = ? 4 32 = 16? ? DESIGN OF ENGINEERING SYSTEMS I April 18, 2011 Regardless of where the cutting plane is taken, the wire is subjected to a transverse shear force of F and a torque equal to FD/2. D is the mean coil diameter Coil Spring = 16? ? 3 = 8 ? 3 ? 3 DESIGN OF ENGINEERING SYSTEMS I April 18, 2011 The inner surfaces of a coil spring are subjected to two additional shear stress: a transverse shear stress resulting from F and an increase in the intensity of torsional stress due to the curvature of the coiled torsion bar The severity of the curvature effect is greater for smaller values of spring...
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4-18-2011v2 - DESIGN OF ENGINEERING SYSTEMS I April 18,...

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