Part I Fundamentals of Machinery Design

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Chapter 1 Introduction Key Terms:machinery designmechanical componentuniversal componentsspecial componentsprinciple fundamentalconcurrent Engineeringcomponent drawingassembly drawing

1.1the Role of Machinery DesignDesign of machine elements is an integral part of the larger and more general field of machinery design.Design of machine elements is the design of mechanical components and devices.Design of Machine Elements consists of the capacity calculation and structure design.

The course Machinery Design is a compulsory course for students who major in mechanical engineering; It is an important technological basic course in mechanical engineering education ; It is not only theoretical but also practical.

1.2Machinery and ComponentsThe mechanical components are the fundamental elements of machinery.Universal Components: bolts, gears, belts, chains, bearings, etc.Special Components: turbine blades, crankshaft, aircraft propeller

Universal Components

Special Components

1.3Overview of Machinery Design

Requirements for machinery design1function:2safety and reliability: strength-stiffness-stabilitysurface quality3manufacturability, economy,ecology, aesthetics, ergonomics, etc.

Consideration in machinery design 1) Cost of manufacturing 2) Cost of operation 3) Cost of maintenance 4) Safety features 5) Packaging and transportation 6) Lubrication 7) Materials 8) Strength 9) Kinematics 10) Styling 11) Drawings 12) Ergonomics

Procedure of machinery design

1studies of feasibility2conceptual design of configuration3detailed technical design4modification of design

1.4Contents and Tasks of the Course1Preliminaries fundamental principle, theory, materials, etc.2Design of Universal Components:Collection and Joints: Thread, Keys, Splines, PinsTransmission: Power Screws, Belt Drives, Chain Drives, Gear Drives,Worm Gearing Shaft System: Sliding Bearings, Rolling-Contact Bearings, Shafts, Couplings, Clutches Other Parts: Springs

Tasks Introduce the students to the principles of mechanical design.Provide the students with the experience in the design of universal components.Build the students English abilities to read ,think and express in specialized fields.

Links of the Course1Twice design projects:Design of a screw jackDesign of a shaft system2Twice experiments:Experiment of belt driveExperiment of hydrodynamic lubrication3Course design (separately):Design of a speed reducer

Learning MethodRelate theory and practice;Complete the homework and design project by yourself;Consult teacher at anytime if you have question;Emphasis on the understanding of the design principles but not the formulas.

NotesGrading policy:1attendance, homework, design project,consultation(40%)2Final results(60%)

ReferencesMachine Elements in Mechanical Design ,Robert L Mott,

The endThanks!