id216_fall2011_wk13_mechanismDesign_IV

id216_fall2011_wk13_mechanismDesign_IV - Product Design...

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Week 13: Mechanism Design IV Seok-Hyung Bae ([email protected]) Product Design Engineering ID216 KAIST
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Product Design Engineering ID216 KAIST Contents Cleghorn, Mechanics of Machines, Oxford University Press, 2005 Ch 7: Cams Ch 11: Synthesis of mechanisms 1
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Product Design Engineering ID216 KAIST Cam A link of a mechanism that transmits motion, by direct contact, to another link, called the follower. Provides a simpler and less expensive method of achieving required motions than other types of mechanism. Motions can more readily be modified by changing the shape of the cam. 2
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Product Design Engineering ID216 KAIST Common Types of Cams 3 Disc or plate Wedge End or face Cylindrical
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Product Design Engineering ID216 KAIST Types of Disc Cam Mechanisms Classified according to follower types 4 Knife edge Flat face Roller Translating Pivoting
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Product Design Engineering ID216 KAIST Disc Cam Mechanism Nomenclature Cam profile: the surface of the cam contacted by the follower Trace point: the point of contact of the knife-edge follower, or the center of the roller follower Pitch curve: the path of the trace point with respect to the cam Base circle: the smallest circle tangent to the cam profile, with its center on the axis of the camshaft Prime circle: the smallest circle tangent to the pitch curve, with its center on the axis of the camshaft Pressure angle: the angle between the normal to the pitch curve and the direction of motion of the trace point 5
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Product Design Engineering ID216 KAIST Disc Cam Mechanism w/ Translating Followers 6
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Product Design Engineering ID216 KAIST Disc Cam Mechanism w/ Pivoting Followers 7
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Product Design Engineering ID216 KAIST Pressure Angle The angle between the normal to the pitch curve and the direction of motion of the trace point Changes as the mechanism moves. A critical parameter in design of disc cam mechanisms Larger values cause the unwanted side thrust on the follower. Should be kept as small as possible (practical maximum: 30 ° ). 8
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How to Reduce Pressure Angle Increase the diameter of the base circle. Increase the diameter of the roller follower. Change the offset of the follower. Change the motion of the follower.
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This note was uploaded on 12/06/2011 for the course ID 216 taught by Professor Bae during the Fall '11 term at Korea Advanced Institute of Science and Technology.

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id216_fall2011_wk13_mechanismDesign_IV - Product Design...

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