© 2020 JETIR June 2020, Volume 7, Issue 6 www.jetir.org (ISSN-2349-5162) JETIR2006241 Journal of Emerging Technologies and Innovative Research (JETIR) www.jetir.org 1663 A REVIEW: SPEED LOSS IN PULLEY AND BELT DRIVES 1 Gangadiya Ketan, 2 Dr. Dipesh Kundaliya, 1 Student, 2 Faculty of Mechanical Department, 1 Master of Engineering in CAD/CAM, 1 Gujarat Technological University, Rajkot, India. Abstract: In earlier century and current industrial scenario transmission system is a vital part of a mechanical engineering and played a critical role in industrial revolution. A variable ratio changing pulley is designed in such a way to provide flexibility for the transmission of power and motion. Flexible pulley can be achieved in terms of using any belt like standard, non-standard, regular, irregular, v-type and flat type belt. This innovation will help us to solve problems like cost effective, reliable, durable and easy to install on any transmission shaft for reducing complexity and also safe for users and environment. Keywords - pulley, slipping, flat belt, v-belt. I. INTRODUCTION A pulley is used to change of intensity between the cable and belt or adjust in fact of a belt or taut cable shaft and a shaft on a hub or wheel that was estimated to support the movement. Pulleys were collected to shape a square and tackle so as to give a mechanical favorable position to apply huge powers. Pulleys were also assembled as a part of belt and chain drives so on transmit power beginning with one turning shaft then onto the next. At least two pulleys in common to a belt are depicted by a belt and pulley system. This recognizes speed to be transmitted across axles, torque, and mechanical power. On the off chance that the pulleys are of contrasting breadths, a mechanical little of leeway is figured it out. In the industry commonly Belt drives is used for power transmission systems. Timing belts, V-ribbed belts, level belts and V- belts like various sorts of belts is available in nowadays. Level belts offer adaptability, while V-belts offer high force transmission limit-ribbed belts, on the opposite hand, combine these two properties. [1] a mixture of speed losses and torque in belt drives occur due to the power losses; sliding of the belt relative to the pulley result in Speed losses, which results the driven pulley angular velocity a decrease within the transmitted power. For an increasing efficiency of correct design of belt drives and reduction in power losses, thus, there is often increased; but for the dominant factors on power loss fundamental understanding needs for the outcome. II. LITERATURE SURVEY W Chengwu Duan et al. [11] design A speed-dependent continuous friction model and employed that accounts for the both micro-slip and macro-slip conditions. To pulley axial dynamics is studied and is coupled with chain segment radial movement. Through the analysis of pulley deformation under loaded condition, the pulley skewness resulting from clearance between the moving pulleys and shaft and the pulley elastic deformation seen as the chain elements press against the pulley. They have studied, Sattler's sinusoidal model is employed for a stiff pulley and results was obtained by the model, simulation results compared with Srnik and Pfeiffer's multi-body dynamics model. Based on analysis of the model results shows pulley deformation plays an important role in defining the chain CVT dynamics as sliding angle, chain tension profile and normal contact force are all affected by the deformation. Mzaki Dakel et al. [4] made extant model, of the pulley belt systems. For the understanding of the belt mechanics and the dynamic behavior. Using the stationary approach, and transient dynamics analysis with slip or without slip. They came up with Iterative Newton Rapshon Method for finding the contact between the belts and pulley the multiple zones of slip. Based on the analysis of the stationary regime, where no slip happens, it shows that increasing the ratio of equivalent shear stiffness to the equivalent tensile stiffness of the belt initially accelerates and then decelerates and during the belt slip over the pulleys, entry and exit slip for the solving transient regime, for the differential equations, the driven pulley velocity, and the belt, tensions was solved by using the explicit Ruwdnge–Kutta time-step integration scheme. Zhang Wu et al. [3] studied on Pulley Deformation of Metal Belt Continuously Variable Transmission. Author design and analysis of a Pulley deformation that affect transmission efficiency of metal belt CVT. The structural three dimensional solid model of the pulley was developed using the Solidworks software. The pulley deformation is analyzed with help of finite element software, and the simulation analysis was done with ANSYS Software. They analyzed the life-span of the CVT of the metal belt deflection, intensify whole-Part wear and reduce. The strain and stress for different NDIV No. of element division for 10, 20 and 30. After using this analysis, the results obtained indicate that stress is increased after reduces for a while, and the driven pulley deformation and stress increase with the increase of transmission ratio, the driver pulley deformation decreases. From the experimental condition is limited, the pulley deformation was analyzed by software ANSYS. The maximum deformation is 0.14mm, it is suitable for the applied, and otherwise, it leads to the deflection of the belt element. Gerbert [7] also analyzed the slip behavior of a rubber belt CVT. The slip was classified on the idea of creep, compliance, shear deflection, and flexural rigidity of the belt. The author also discussed slip during wedging because of the poor fit between the belt and also the pulley. Finite element analysis was want to calculate shear deflections within the belt and to work out stick-slip conditions for the belt. However, the work didn't account for loading conditions, the influence of belt inertia, and belt radial variations (due to pulley axial forces) on the slip behavior.