Mechanical Systems: Gear Transmission Principles

This lecture covers the principles of gear transmission, focusing on standardized gear parameters and conditions for proper engagement. It begins with a review of the previous week's material, discussing the normalized parameters of gear teeth, including pressure angles and the significance of the base and head circles. The instructor explains the conditions for continuity in gear transmission, emphasizing the importance of maintaining contact between teeth. The lecture then transitions to the methods of gear tooth shaping, detailing various techniques such as hobbing and shaping, and their respective advantages and limitations. The discussion includes the wear and failure modes of gears, highlighting the importance of contact pressure and flexural stress in gear design. The instructor introduces the Hertz contact theory to analyze contact pressures between gear teeth, providing insights into the distribution of stress and the criteria for ensuring durability. The session concludes with a quiz to reinforce the concepts covered, ensuring students grasp the essential principles of gear transmission and design.