2-Section two(basic knowledge)

2-Section two(basic knowledge) - Discussion Mechanical...

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Unformatted text preview: Discussion Mechanical systems are composed of several mechanical devices. Please give us the names of these typical mechanical devices. Would you mind giving us a product as an example? What are the function (or characteristics) of these common elements? What are major considerations when you begin to design machine elements? Section two Design of the Transmission Elements Design of the Transmission Elements 1.General Design Method of Machine Elements 2. Fatigue L v { Failure e&& ) 3.Design of Gears L v { B 4.Design of Worms L v { B 5.Belts Transmission L v { 6.Introduction of Chain L v { B& Topics of todays lecture 1. General Design Method of Machine Elements failure analysis method 2. Fatigue failure Features L Y { of fatigue failure Influencing L Y { factors L Y { of fatigue 3. oads exerted L Y { on the gear teeth 1.General Design Method of Machine Elements 1)Considerations of Machine Elements Design a) Function Requirement BodyStrength e&&& , deflection e&&& , weight, size and shape Surfaces Wear e&&& , lubrication e&&& , corrosion e&&& , frictional force, frictional heat generated b) Safety Safety Factor [ ] S = Allowable normal strength Design normal strength If S>1, the design is adequate & & & & & & & & ; If S<1,the design may be inadequate & & & && & & & and redesign may be necessary. How can you choice a suitable S for the different design conditions? Please find more information in reference [2 e 3] after class. c) Reliability ; z { For situations where a reasonable ; z { worst-case scenario ; z { cannot be defined, reliability methods are sometimes a reasonable design approach....
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This note was uploaded on 10/26/2010 for the course MECHANICAL 072203 taught by Professor Zhangying during the Spring '06 term at Tsinghua University.

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2-Section two(basic knowledge) - Discussion Mechanical...

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