International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 06 | Jun 2025
p-ISSN: 2395-0072
www.irjet.net
Design and Performance Evaluation of an Electric Bike Integrated with a 4-Speed Manual Transmission System Pavankumar Karsinapu Department of Mechanical Engineering, NOVA College of Engineering & Technology, Jangareddigudem, Andhra Pradesh, INDIA ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - This paper delineates the design, fabrication, and
Brushless DC (BLDC) motor. The objective of the proposed system is to enhance the bicycle's performance with respect to torque modulation, range extension, and energy utilization. The integration of multiple gears facilitates improved power delivery, particularly during ascents or rapid acceleration scenarios, where torque demands are elevated.
empirical performance evaluation of an electric bicycle that incorporates a manually operated four-speed gear transmission system. The system is powered by a 48V, 1000W BLDC motor, which is coupled with a 48V*28Ah battery pack and a conventional mechanical gear assembly. This configuration aims to enhance torque delivery and optimize efficiency across diverse terrain types. The research employs design equations alongside field data to assess motor torque, energy consumption, and the overall efficiency of the system. The prototype attained a maximum speed of 90.6 km/h and a range of 90 km per charge. The integration of a multi-speed gear system indicates substantial potential for improving the performance of electric vehicles, particularly in urban and semi-urban contexts, by enhancing control, adaptability, and energy utilization. This study provides significant insights into cost-effective, high-efficiency solutions within the rapidly evolving field of personal electric mobility.
1.3 Scope and Contribution This project encompasses the comprehensive processes of component selection, system integration, practical fabrication, and performance validation through field testing and analytical approaches. Key performance metrics, such as maximum speed, torque, range per charge, and overall motor efficiency, are assessed to establish the practical feasibility of the hybrid electric transmission model. This study significantly contributes to enhancing design flexibility and performance reliability of electric mobility solutions, thereby advancing sustainable transportation initiatives for the future.
Key Words: Electric Bike, 4-Speed Transmission, BLDC Motor, Electric Vehicle Performance, Torque Analysis, Sustainable Mobility
2.LITERATURE REVIEW
INTRODUCTION
Electric bicycles, commonly referred to as e-bikes, have become a significant solution for promoting sustainable personal mobility. Their inherent characteristics of simplicity, cost-effectiveness, and zero-emission operation render them particularly suitable for both urban and semiurban settings. Nonetheless, a notable limitation observed in the majority of commercially available e-bikes is the absence of an adaptable transmission system, as many models depend on single-speed direct-drive mechanisms. This reliance constrains the modulation of torque, energy efficiency, and overall performance across diverse terrains. In response to this challenge, researchers have investigated various alternatives, including multi-speed gear systems, continuously variable transmission (CVT), and planetary gear configurations, aimed at enhancing motor utilization, torque delivery, and ride comfort. The subsequent literature provides a thorough analysis of these initiatives and elucidates how they substantiate and support the objectives of the present study.
1.1 Background and Motivation Electric vehicles have emerged as a crucial alternative to traditional gasoline-powered vehicles, primarily due to their environmentally friendly characteristics and enhanced energy efficiency. Within this category, electric bicycles (ebikes) are gaining considerable popularity in both urban and semi-urban transportation sectors, attributed to their affordability, ease of use, and minimal environmental impact. Nonetheless, the majority of commercially available e-bikes are equipped with hub motors and single-speed transmissions, which restrict their efficiency and torque delivery under diverse road and load conditions. 1.2 Objective Of the Study In response to this limitation, the present research concentrates on the design and development of an electric bicycle that incorporates a manually operated four-speed mechanical transmission system in conjunction with a 48V
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