International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 11 Issue: 05 | May 2024
www.irjet.net
p-ISSN: 2395-0072
Design and Fabrication Of Shaft Driven Bicycle With Incorporating A Three Speed Gearbox Charan S1, Pravin P2, Logashwaran B3, Logeswaran P4, Midhun K5, Pavanan B6 1,2,3,4,5Student, Department of Mechanical Engineering, Rajiv Gandhi College Of Engineering And Technology,
Puducherry, India.
6Assistant Professor, Department of Mechanical Engineering, Rajiv Gandhi College Of Engineering And Technology,
Puducherry, India. ---------------------------------------------------------------------***--------------------------------------------------------------------1.2 Gearbox Abstract - The project aims to innovate bicycle drivetrain systems by integrating a shaft-driven mechanism with a 3speed gearbox, addressing challenges like maintenance and limited gear range in traditional chain-based systems. It involves designing, fabricating, and testing a prototype, emphasizing optimized gear ratios and durability. Fabrication includes cutting, welding, machining, and assembly, ensuring precision and compatibility. Rigorous quality control measures are implemented. Testing evaluates performance under realworld conditions, focusing on efficiency and durability. The project contributes to advancing bicycle drivetrain technology, with potential applications in commuter and urban cycling for sustainability and performance enhancement
Gearboxes are crucial in mechanical systems, adjusting shaft speed and torque for varied applications. They enable power transmission and control in industries like automotive and robotics. Types include spur, helical, bevel, and worm gears, each serving specific purposes. Planetary gearboxes stand out for compactness and high torque. Efficiency is key, achieved through precision manufacturing and lubrication. Gearboxes play an indispensable role in advancing technology and innovation by optimizing performance across diverse applications In this project, we focus on the constant mesh gearbox, exploring its design principles, operational characteristics, and applications alongside synchronous mesh, planetary gearbox, and sliding mesh types. Understanding these gearbox mechanisms is crucial for optimizing performance in various applications.
Key Words: Drivetrain systems, 3 speed Gearbox, Design, Fabrication, Testing, Efficiency enhancement
1. INTRODUCTION
1.3 Computer Aided Design
1.1 Shaft Drive System
Computer-Aided Design (CAD) software is utilized by engineers, architects, and designers to create precise technical drawings and 3D models of physical objects or structures. It enables design, visualization, analysis, and documentation with efficiency and accuracy, serving as an indispensable tool across industries like manufacturing, construction, automotive, and aerospace. CAD software has evolved from 2D drafting tools in the 1960s to incorporate advanced 3D modelling, simulation, and collaboration features. Initially requiring mainframe computers, CAD is now accessible on desktops, laptops, and mobile devices. Key features include drawing tools for precise 2D drawings, 3D modelling capabilities for virtual representations, parametric design for defining geometric relationships, assembly design for complex products, simulation and analysis for assessing performance, documentation and annotation for detailed communication, and collaboration and sharing features for remote teamwork and data access
The pedaling motion initiation begins with the rider applying force to the pedals, transmitting it through the crankset, which consists of one or more cranks attached to the pedals. Instead of directly connecting to the rear wheel, some bicycles utilize a shaft-driven system for power transmission. This system employs a shaft, a long rotating rod, to transmit torque from one point to another. Near the crankset, a bevel gear is attached to the end of the shaft, transferring motion. This bevel gear meshes with another attached to the end of the crankset, forming a bevel gear pair that transfers the torque from pedaling to the shaft. As the rider continues to pedal, the torque applied to the crankset is transmitted to the shaft through the meshing bevel gears, causing the shaft to rotate. At the other end of the shaft, another bevel gear is attached, which meshes with a bevel gear mounted on the hub of the rear wheel. Consequently, as the shaft rotates due to pedaling, torque is transferred to the rear wheel hub's bevel gear, propelling the rear wheel forward. The speed and force of the rider's pedaling influence the speed and power transmitted to the rear wheel, thereby determining the bicycle's speed
© 2024, IRJET
|
Impact Factor value: 8.226
|
ISO 9001:2008 Certified Journal
|
Page 1902