International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 06 | Jun 2023
p-ISSN: 2395-0072
www.irjet.net
Design, Analysis, and Optimization of Continuous Variable Transmission Kishan Gohil1, Hitesh Raiyani2 1Student, Mechanical Engineering. L.J. Institute of Engineering & Technology
2Professor, Mechanical Engineering, L.J. Institute of Engineering & Technology, Ahmedabad, Gujarat, India
---------------------------------------------------------------------***--------------------------------------------------------------------Wen-Fang Wu, Tyng Liu, and Chih-Hsien Wu conducted a Abstract - The Continuous Variable Transmission (CVT) failure analysis on the continuously variable transmission (CVT) system, which is one of the scooter’s major components. They identified potential failure modes using fault tree analysis (FTA) and failure mode, effect, and criticality analysis (FMECA). The impacts of component failure on the CVT system are highlighted [6].
system offers a solution that permits stepless gear ratio shifting regardless of the required speed and torque. Since its introduction a century ago, CVT technology has grown in popularity among luxury vehicles. However, CVTs are not widely used in machinery because of some limitations in the existing design. This study evaluates the CVT's design to identify its weakest point. Increasing the CVT's design efficiency to extend its operational life. The current design has several issues that should be minimized, including noisy operation, jerking while accelerating, and lack of awareness of speed changes, expensive production, low belt life, and belt sliding after a certain number of cycles. For that, a Solid Works CVT model has been made, and Ansys will be used for analysis. The CVT V-Belt, which is built of composite material, is the subject of this study. As one of the transmission's major components, the performance of the belt under extreme conditions may provide insight into its long-term durability and performance. This study was conducted in five steps: review of the existing design, analysis of the existing design, design optimization, analysis of the revised design, and result comparison. The belt's material was changed to achieve an optimized design.
2. PROBLEM FORMULATION: Hiroshi lizuka, Yoshikatsu Ohta, Akihiro Ueno, and Takeshi Murakam’s research on CVT V-belt examination uses experiments and finite element analysis (FEA) to determine the failure initiation point. FEA results show that as tooth load increases, stress initiation shifts from the working flank’s opposite side to the working flank side. The failure initiation site is primarily determined by tooth load distribution on the working stress on the working flank side, while the load near the tooth tip causes high stress on the opposite side. The belt underwent initial stress after looping around the pulley, the general model was used to analyze the contact area and tension distribution [6].
3. DESIGN AND CALCULATION
Key Words: Cvt, Solid Works, Ansys, V-belt
3.1 Calculation
1. INTRODUCTION
Dimension of pulley
V-belt CVTs are popular due to their lightness and quietness, as well as their greater gearbox efficiency. They are commonly used in small automobile vehicles and have been studied for their mechanics and efficiency [1, 2]. Gerbert looked into the operation of V-belts and found that rubber CVT belt’s durability is the most important issue. The specified lifetime is 25,000 km, so it is important to make recommendations for enhancing fatigue strength. However, since rubber CVT belts are made of composite material, it is difficult to explain the fatigue failure mechanism for these belts. CVT belts are subjected to high tension, bending deformation, and pulley friction forces, which can lead to fatigue failure [3]. The coed was harmed by cyclic bending around the pulley, collecting fatigue damage from the synchronous belts. To strengthen the rubber CVT belts, detailed observations and mechanical analysis are needed [5].
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Impact Factor value: 8.226
The material of the pulley is mild steel. Pulley is made in 2 Disks. The density if mild steel is 7860 kg/m3. Center distance between pulleys (C) = 214mm. Driven pulley diameter (Assuming) = 195.5mm Driving pulley diameter (d)
Driving Pulley diameter (d) =152.5mm Variation in diameter of a driving pulley (t) = (138.5-46.5)
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