圈上海夫通大华 e西b口 LECTURE 11 ME371/ME337 DESIGN AND MANUFACTURING Cam Design Covered: 漏 Ch8 in Design of Machinery SHAN 圈上泽夫通大学 Lectures Power/Energy Conversion (Electrical Motors) Power/Energy Transmission (Gears,Cam,Linkage, Belt Drives, Power Screws Transmission Joints (Fasteners, Support Connectors) (Bearings) Structural Support (Frames) Tools Statics,Dynamics, Stress Analysis,etc. 1
1 Cam Design LECTURE 11 ME371/ME337 DESIGN AND MANUFACTURING Covered: Ch8 in Design of Machinery Lectures Power/Energy Conversion (Electrical Motors) Transmission Support (Bearings) Joints (Fasteners, Connectors) Structural Support (Frames) Tools Statics, Dynamics, Stress Analysis, etc. Power/Energy Transmission (Gears, Cam, Linkage, Belt Drives, Power Screws)
国上海支大华 Outline © Cam Introduction ©Cam Motion Diagrams ®Cam Synthesis ©Sizing the Cam 国 上海充廷大学 Cam Introduction CAM:Has a curved or grooved surface that mates with a follower: Imparts motion to follower.The follower oscillation, translation,or both Cam-follower system advantages: Convenient device for transforming one motion into another >More compact than linkages 2
2 Outline Cam Introduction Cam Motion Diagrams Cam Synthesis Sizing the Cam CAM: Has a curved or grooved surface that mates with a follower : Imparts motion to follower. The follower oscillation, translation, or both Cam-follower system advantages: Convenient device for transforming one motion into another More compact than linkages Cam Introduction
圈上海文通大华 Cam Introduction ▣Function generator Follower Fixture Cam 圈上泽夫道大学 Cam-follower Type ▣ Cam-follower systems can be classified by type of: >Type of the cam(radial and cylindrical) >Type of follower motion(rotation,translation) >Type of joint closure(force,form) >Surface of contact(roller,mushroom,flat) >Path of the motion of the follower(radial,axial) >Type of motion constraints(critical extreme position(CEP)and critical path motion(CPM)) >Type of motion program(rise-fall(RF),rise-fall- dwell(RFD),rise-dwell-fall-dwell(RDFD) 3
3 Cam Introduction Cam Follower Fixture Function generator Cam-follower systems can be classified by type of: Type of the cam(radial and cylindrical) Type of follower motion (rotation, translation) Type of joint closure (force, form) Surface of contact (roller, mushroom, flat) Path of the motion of the follower (radial, axial) Type of motion constraints (critical extreme position(CEP) and critical path motion (CPM)) Type of motion program (rise-fall (RF), rise-falldwell (RFD), rise-dwell-fall-dwell (RDFD) Cam-follower Type
国上清文大华 Cam-follower Type 口Cam types Plate or disc Translating Cylindrical (盘形凸轮) (移动凸轮) (圆柱凸轮) 圈上泽夫道大学 Cam-follower Type Half joint 口 Follower motion Cam >Translation ·Radial 4 Offset from center of cam shaft >Oscillation(Rotation) Spring Follower 4
4 Cam types Plate or disc （盘形凸轮） Translating （移动凸轮） Cylindrical （圆柱凸轮） Cam-follower Type Follower motion Translation • Radial • Offset from center of cam shaft Oscillation (Rotation) Cam-follower Type
国 上海文通大学 Cam-follower Type Shape of follower contact surface > Flat-face(平底从动件) Package smaller eg.Automotive valve) Roller(滚子从动件) Lower friction,but more expensive >Mushroom Roller Mushroom Flat-Faced Follower Follower Follower 4 Follower Follower Follower Spring Spring Spring Cam Cam a 圈上泽夫道大学 ▣ Follower types Cam (a)Cam with knife (6)Cam with roller (c)Cam with flat edge follower. faced follower. pherical faced ●tse (d)Cam with spherical (e)Cam with spherical 价Cam wit恤offset faced follower. faced follower. follower. 5
5 Shape of follower contact surface Flat-face(平底从动件) • Package smaller ( eg. Automotive valve) Roller（滚子从动件） • Lower friction , but more expensive Mushroom Cam-follower Type Roller Follower Mushroom Follower Flat-Faced Follower Flat-Faced Follower Mushroom Follower Roller Follower Follower types