Polycopy of courses Mechanical Construction II Intended for 3rd Year Undergraduate Students. Option: Mechanical Construction

Abstract

Preface This mechanical construction course is intended for third-year undergraduate students who have chosen the mechanical engineering track with a specialization in mechanical construction. It corresponds to the Construction Mechanical (II) module: Semester: 6 Subject: Mechanical construction II Course Unit: UEF Hours: 67 (Lectures: 3 hours, Tutorials: 1.5 hours) Credits: 6 Coefficient: 3 This course is a continuation of the CM1 curriculum and focuses primarily on the sizing calculations for the main motion transmission components of machines (gears, bearings, shafts, etc.), as well as the general technological study of mechanisms (reducers, gearboxes, etc.). It is written in a simplified style, with exercises at the end of each chapter that I believe are helpful for understanding the course content. This course equips students with the ability to analyze and calculate the various components of a machine. The content of this course material is structured into five chapters. Chapter 1 is devoted to gears, studying geometric characteristics of gears for different types, namely cylindrical gears with straight teeth, helical gears, bevel gears with straight teeth and helical teeth, and finally the worm and wheel. The processes for obtaining them and the cutting of gears are also part of this chapter. Chapter 2 is devoted to the dynamic study of surface pressure and breaking strength for cylindrical gears (straight and helical teeth). The study of shafts and axles under various stresses, including traction and compression, shear, torsion, and bending, occupies Chapter 3. The calculation of the preliminary diameter of the axles and shafts, as well as the verification of the shafts and axles for fatigue, is studied. Chapter 4 is dedicated to the study of bearings and thrust bearings as well as belt and chain transmission systems. We are looking for their essential characteristics such as length, transmission ratio and center distance already studied. Chapter 5 is devoted to the technological applications of the elements studied previously, namely: reducers, gearboxes and epicyclic gear trains, their description and operation, as well as their kinematic diagrams. ii Chapter 6 is devoted to general concepts of couplings. Their types and functions are examined. The different types of clutches and brakes are discussed. Finally, this course conforms to the curriculum adopted by the Ministry of Higher Education and Scientific Research; it contributes to the improvement of mechanical engineering education