4-18-2011v2

4-18-2011v2 - DESIGN OF ENGINEERING SYSTEMS I Power Screw...

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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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This note was uploaded on 09/20/2011 for the course ENG 303 taught by Professor Any during the Fall '08 term at Rutgers.

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4-18-2011v2 - DESIGN OF ENGINEERING SYSTEMS I Power Screw...

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