机械设计(第四版)(英文版)

　　本书是美国robert l. mott教授所著machine elements in mechanical design（fourth edition，2004）的缩编版。缩编者在保持原书特色和风格的前提下，根据我国机械设计课程的教学要求，删去了原书中与我国其他先修课程重复的部分内容，将原书23章缩编为16章，并将计量单位转换为公制。缩编后的内容包括：机械设计概论，带传动与链传动，齿轮传动与蜗杆传动，轴，轴联接件（键、联轴器、密封），滚动轴承，滑动轴承，紧固件，弹簧，机座，离合器与制动器，设计大作业等。
　　 本书可作为高等学校工科机械类专业机械设计课程的双语教学教材，也可供从事机械专业的教师、研究生或工程技术人员参考。

patrⅰprinciples of design and stress analysis
　1 the nature of mechanical design
　　the big picture
　　you are the designer
　　　1-1 objectives of this chapter
　　　1-2 the mechanical design process
　　　1-3 skills needed in mechanical design
　　　1-4 functions, design requirements, and evaluation criteria
　　　1-5 example of the integration of machine elements into a mechanical design
　　　1-6 computational aids in this book
　　　1-7 design calculations
　　　1-8 unit systems
　　references
　　problems
　2 materials in mechanical design
　　the big picture
　　you are the designer
　　　2-1 objectives of this chapter
　　　2-2 properties of materials
　　　2-3 classification of metals and alloys

　　The objective of this book is to provide the concepts, procedures, data, and decision analy-sis techniques necessary to design machine elements commonly found in mechanical de-vices and systems. Students completing a course of study using this book should be able to execute original designs for machine elements and integrate the elements into a system composed of several elements. .
　　This process requires a consideration of the performance requirements of an individ-ual element and of the interfaces between elements as they work together to form a system. For example, a gear must be designed to transmit power at a given speed. The design must specify the number of teeth, pitch, tooth form, face width, pitch diameter, material, and method of heat treatment. But the gear design also affects, and is affected by, the mating gear, the shaft carrying the gear, and the environment in which it is to operate. Furthermore, the shaft must be supported by bearings, which must be contained in a housing. Thus, the designer should keep the complete system in mind while designing each individual ele-ment. This book will help the student approach design problems in this way.
　　This text is designed for those interested in practical mechanical design. The empha-sis is on the use of readily available materials and processes and appropriate design ap-proaches to achieve a safe, efficient design. It is assumed that the person using the book will be the designer, that is, the person responsible for determining the configuration of a ma-chine or a part of a machine. Where practical, all design equations, data, and procedures needed to make design decisions are specified.
　　It is expected that students using this book will have a good background in statics, strength of materials, college algebra, and trigonometry. Helpful, but not required, would be knowledge of kinematics, industrial mechanisms, dynamics, materials, and manufactur-ing processes.
　　Among the important features of this book are the following:
　　1. It is designed to be used at the undergraduate level in a first course in machine design.
　　2. The large list of topics allows the instructor some choice in the design of the course. The format is also appropriate for a two-course sequence and as a refer-ence for mechanical design project courses.
　　3. Students should be able to extend their efforts into topics not covered in classroom instruction because explanations of principles are straightforward and include many example problems.
　　4. The practical presentation of the material leads to feasible design decisions and is useful to practicing designers.
　　5. The text advocates and demonstrates use of computer spreadsheets in cases re-quiring long, laborious solution procedures. Using spreadsheets allows the de-signer to make decisions and to modify data at several points within the problem while the computer performs all computations. See Chapter 5 on spur gears, Chapter 8 on shafts, and Chapter 13 on spring design.
　　6. References to other books, standards, and technical papers assist the instructor in presenting alternate approaches or extending, the depth of treatment.
　　7. In addition to the emphasis on original design of machine elements, much of the discussion covers commercially available machine elements and devices, since many design projects require an optimum combination of new, uniquely designed parts and purchased components.
　　8. For some topics the focus is on aiding the designer in selecting commercially available components, such as rolling contact beatings, flexible couplings, belt drives, chain drives, clutches, and brakes.
　　9. Computations and problem solutions use both the International System of Units(SI) and the U.S. Customary System (inch-pound-second) approximately equally.The basic reference for the usage of SI units is IEEE/ASTM-SI-10 Standard for Use of the International System of Units (SI): The Modern Metric System, which has replaced ASTM E380 and ANSI/IEEE Standard 268-1992.
　　10. Extensive appendices are included along with detailed tables in many chapters to help the reader to make real design decisions, using only this text.
　　FEATURES OF THE FOURTH EDITION
　　The practical approach to designing machine elements in the context of complete mechan-ical designs is retained and refined in this edition. An extensive amount of updating has been accomplished through the inclusion of new photographs of commercially available machine components, new design data for some elements, new or revised standards, new end-of-chapter references, listings of Intemet sites, and some completely new elements.The following list summarizes the primary features and the updates.
　　1. The three-part structure that was introduced in the third edition has been main-tained. ..
　　■ Part I (Chapters 1 ~3) focuses on reviewing and upgrading readers' understand-ing of design philosophies, the principles of strength of materials, the design properties of materials, and design for different types of loading.
　　■ Part II (Chapters 4~10) is organized around the concept of the design of a com-plete power transmission system, covering some of the primary machine ele ments such as belt drives, chain drives, gears, shafts, keys, couplings, seals, and rolling contact bearings. These topics are tied together to emphasize both their interrelationships and their unique characteristics. Chapter 10, Completion of the Design of a Power Transmission, is a guide through detailed design deci-sions such as the overall layout, detail drawings, tolerances, and fits.