Fabrication Of Continuous Variable Transmission

MEE 218Hardware Project

Final ReviewBy

Ankit Kumar Verma- 11BME0170Kalyan K- 11BME0078

Kartik Kaushik- 11BME0089

Project Guide Project ReviewerProf.G. Sairam Prof. Jeyapandiarajan PSMBS, VIT University SMBS, VIT University

ABSTRACT

Continuously Variable Transmissions have recently become focused topic of research due to their potential to increase automobile efficiency and additional weight reduction of heavy transmission system. While progress has been made in the application of the CVT to the automobile, the application of the transmission in the locomotive both improves the field of friction based transmissions in a unique way and solves issues present with the standard vehicle transmission. By applying CVT technology to the vehicle, the transmission is forced to become both small and lightweight, thus providing a benefit to vehicle as a whole. Additionally, using a CVT in a locomotive reduces the complications involved with the vehicle transmission by eliminating the complicated gear system and replacing it with a single, self-contained package that requires little maintenance and no background to operate.

Problem Statement

Within the past century, there has only been one common means of transmitting power from a cyclist to the rear wheel of the bicycle. While the chain and derailleur system is lightweight and efficient, it can be difficult to maintain and operate, and puts an unnecessary stress on the cyclist’s joints when shifting, since there is a discontinuity in the torque between two gears. One potential means of solving these problems is the replacement of the standard bicycle transmission with a continuously variable transmission (CVT). A CVT is a friction driven transmission that does not use gears to gain a mechanical advantage in transmitting power between an input and output.

PROJECT PLAN

CAD MODEL

Material Selection

Material selection for different parts have been decided• Drums :- mild steel grade 1060 B • Supporting rods :- Mild Steel grade 1060 B • Base :-Scrap• To produce drums CNC machining was used.

CONCLUSION

The CAD model with dimensions have been built and also the research and survey has been done about the Continuous Variable Transmission (CVT). Moreover, the material has been selected for our model. The market survey has helped us to know about the availability of the material. Finally the model has been successfully fabricated.

APPLICATIONS

• The one of the appliclation of this project is to eliminate the interval-based gearing shift in bicycles and to create an automatic and continuous change in gearing ratios, hence providing a constant torque input (or force on the pedals) for the cyclist. In conventional gearing systems, factors such as temperature can change the tension in wires, thus desynchronizing the wire’s pull and the position of the chain on a fixed gear. This creates problems such as uncontrolled shift of the speed. The design we explain in this report easily avoids this problem.

REFERENCES[1] B. Bocook, C. Criss, E. Fishman, R. Michols, and G. Weisberg, “Bicycle CVT DesignReport,” EMAE 360, Case Western Reserve University, Cleveland, Ohio, Dec. 2011. [2] K. Kazerounian and Z. Furu-Szekely, “Parallel disk continuously variable transmission(PDCVT),” Mech. and Mach., vol. 41, pp. 537-566, 2006. [3] H. Machida and Y. Murakami, “Development of the POWERTOROS UNIT HalfToroidal CVT,” NSK Tech. J., vol. 9, pp. 15-26, Oct. 2000. [4] G. Carbone, L. Mangialardi, and G. Mantriota, “A comparison of the performances offull and half toroidal traction drives,” Mech. and Mach., vol. 39, pp. 921-942, 2004. [5] M. Mensler, S. Joe, and T. Kawabe, “Identification of a toroidal continuously variabletransmission using continuous-time system identification methods,” Control Eng. Practice, vol.14, pp. 45-58, 2006. [6] T. Yamamoto, K. Matsuda, and T. Hibi, “Analysis of the efficiency of a half-toroidalCVT,” JSAE, vol. 22, pp. 565-570, 2001. [7] H. Tanaka, H. Machida, H. Hata, and M. Nakano, “Half-Toroidal Traction DriveContinuously Variable Power Transmission for Automobiles* (Traction Drive Materials,Transmission Design and Efficiency),” JSME Int. J., series c, vol. 38, no. 4, pp. 772-777, 1995.