Part I Fundamentals of Machinery Design

Conveyor

Chapter 1 Introduction

Key Terms:• machinery design• mechanical component• universal components• special components• principle fundamental• concurrent Engineering• component drawing• assembly drawing

1.1the Role of Machinery Design

• Design 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 Components

The 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 DesignRequirements for machinery design1、 function:2、 safety and reliability: ①strength-stiffness-stability②surface quality3、manufacturability, 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

1） studies of feasibility

2） conceptual design of configuration

3） detailed technical design

4）modification of design

1.4Contents and Tasks of the Course

1、 Preliminaries fundamental principle, theory, materials, etc.2、 Design of Universal Components:• Collection and Joints: Thread, Keys, Splines,

Pins• Transmission: Power Screws, Belt Drives, Ch

ain Drives, Gear Drives,Worm Gearing• Shaft System: Sliding Bearings, Rolling-Cont

act 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 student’s English abilities to read ,think and express in specialized fields.

Links of the Course

1、 Twice design projects:• Design of a screw jack• Design of a shaft system

2、 Twice experiments:• Experiment of belt drive• Experiment of hydrodynamic lubrication

3、 Course design (separately):• Design of a speed reducer

Learning Method

• Relate 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.

Notes

• Grading policy:

1） attendance, homework, design project,consultation(40%)

2） Final results(60%)

References

• 机械设计，濮良贵，高等教育出版社• 机械设计学习指南，濮良贵，高等教育出版社

• Machine Elements in Mechanical Design ,Robert L Mott, 机械工业出版社

The endThanks!