chapter8-a_cam - MEEG439 MACHINE DYNAMICS SPRING 2006...

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Unformatted text preview: MEEG439 MACHINE DYNAMICS SPRING 2006 Chapter 8 Cam Design 8.0 Introduction Easy to design, difficult to make Equivalent to four-bar linkage with variable length links Function generation This chapter deals with design of cams to meet specific goals 8.1 Cam Terminology Classify cams by o Type of follower motion Translating Rotating See Fig. 8-1 Can instantaneously replace cam follower pair by a four-bar linkage or slider crank Type depends on whether you want rectilinear or rotational motion o Type of cam Radial Cylindrical 3-D 1 7b8aa3b29aea4439b0d77d343027410487fee10d.doc MEEG439 MACHINE DYNAMICS SPRING 2006 Fig 8-1 cams are radial cams Fig 8-4 cams are axial cams e.g. motorcycle transmission shifter rotation of the cam slides the gears in and out of contact o Type of joint closure Force closed (requires an external force be applied to the joint to keep the two links, cam and follower, physically in contact. This force is usually provided by a spring. Form closed (closes the joint by geometry) 2 7b8aa3b29aea4439b0d77d343027410487fee10d.doc MEEG439 MACHINE DYNAMICS SPRING 2006 See Fig. 8-2 Spring often provides closure force Form closed cams have 2 cam surface to be able to push and pull the follower o Type of follower Curved or flat Rolling or sliding See Fig. 8-3 Flat face and mushroom Easy to manufacture 3 7b8aa3b29aea4439b0d77d343027410487fee10d.doc MEEG439 MACHINE DYNAMICS...
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chapter8-a_cam - MEEG439 MACHINE DYNAMICS SPRING 2006...

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