h 上海充通大学 Shanghai Jiao Tong University Mechanical Design and Manufacturing II Power/Energy Transmission: Power Screws(传动螺旋)
1 Power/Energy Transmission: Power Screws（传动螺旋） Mechanical Design and Manufacturing II
上潘充通大学 Shanghai Jiao Tong University Lectures Power/Energy Conversion Power/Energy (Electrical Motors) Transmission Gears,Cam,Linkage, Belt Drives, Power Screws) Transmission Joints (Fasteners, Support Structural Connectors) (Bearings) Support (Frames) Tools Statics,Dynamics, Stress Analysis,etc. 2
2 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)
上海充通大学 Shanghai Jiao Tong University Power Screw Principlesl >The screw thread is one of the most important inventions ever made >Power screw using the principle of a screw thread and its mating nut >Used to convert rotation to linear motion >in actuators,production machines (Lead screws)and jacks,etc. >Transmit power,exert the necessary force to move a machine element along a desired path. >Capable of very large mechanical advantages, can lift or move large loads,the speed is often slows
3 The screw thread is one of the most important inventions ever made Power screw using the principle of a screw thread and its mating nut Used to convert rotation to linear motion in actuators, production machines (Lead screws) and jacks, etc. Transmit power, exert the necessary force to move a machine element along a desired path. Capable of very large mechanical advantages, can lift or move large loads, the speed is often slow. Power Screw Principles1
上海充通大学 Shanghai Jiao Tong University Power Screw Applicationsl .Power screws >Either screw can move,as in a jack or >Nut can move,as in a positioning device. servomotor nut brg coupling screw lead screw nut base
4 Power Screw Applications 1 •Power screws Either screw can move, as in a jack or Nut can move, as in a positioning device
上海充通大学 Shanghai Jiao Tong University Lead Screw and Ball Screw Lead screw(传导螺轩 Lead screws are essentially accurate screws used to move a nut attached to a load,and they have been used for centuries to convert rotary motion into linear motion -Lead screws are commonly used on manual economy machine tools -Efficiency in a lead screw system may be 30-50%
5 Lead Screw and Ball Screw Lead screw(传导螺杆) • Lead screws are essentially accurate screws used to move a nut attached to a load, and they have been used for centuries to convert rotary motion into linear motion – Lead screws are commonly used on manual economy machine tools – Efficiency in a lead screw system may be 30-50%