ME350 Mechanical Design and Manufacturing II Springs
ME 350 Mechanical Design and Manufacturing II Springs
Basics Springs are elastic members which exert >Forces >Torques ·And absorb energy Springs are designed to provide a >Push >Pull,or >Twist It is often more economical to use stock spring
Basics • Springs are elastic members which exert ØForces ØTorques • And absorb energy • Springs are designed to provide a ØPush ØPull, or ØTwist • It is often more economical to use stock spring
Types ·Torsion bar springs ·Vire springs >Helical springs =Round =Square or rectangular Generally not recommended ·Flat springs >Cantilever >Elliptical >Spring washers =Belleville springs Special-shaped springs
Types • Torsion bar springs • Wire springs ØHelical springs =Round =Square or rectangular vGenerally not recommended • Flat springs ØCantilever ØElliptical ØSpring washers =Belleville springs • Special-shaped springs
Types standard- variable pitch barrel constant rate variable rate hourglass conical (a)Helical compression springs.Push-wide load and deflection range-round or rectangular wire.Standard has constant coil diameter,pitch,and rate.Barrel,hourglass,and variable-pitch springs are used to minimize resonant surging and vibration. Conical springs can be made with minimum solid height and with constant or increasing rate (b)Helical extension springs.Pull-wide (c)Drawbar springs.Pull-uses comp- (d) Torsion springs.Twist- load and deflection range-round ression spring and drawbars to provide round or rectangular or rectangular wire,constant rate extension pull with fail-safe,positive stop. wire-constant rate
Types
Types Belleville wave slotted finger curved e Spring washers.Push-Belleville has high loads and low deflections-choice of rates(constant,increasing,or decreasing). Wave has light loads,low deflection,uses limited radial space.Slotted has higher deflections than Belleville. Finger is used for axial loading of bearings.Curved is used to absorb axial end play. Volute spring.Push一 (g)Beam springs.Push or Pull- (h)Power or motor springs. (i)Constant Force. may have an inherently wide load but low deflection Twist-exerts torque over Pull-long high friction damping. range-rectangular or shaped many turns.Shown in,and deflection at low cantilever,or simply supported removed from,retainer. or zero rate
Types