XVII th World Congress of the International Commission of Agricultural and Biosystems Engineering (CIGR) Hosted by the Canadian Society for Bioengineering (CSBE/SCGAB) Québec City, Canada June 13-17, 2010 DESIGN AND MANUFACTURE OF A NEW AND SIMPLE MECHANISM FOR TRANSMISSION OF POWER BETWEEN CROSSOVER SHAFTS UP TO 135 DEGREES FOR FARM MACHINERY M. YAGHOUBI 1 , S.S. MOHTASEBI 1 , A. JAFARI 1 , H. KHALEGHI 1 1 M. YAGHOUBI Department of Agricultural Machinery Engineering, Faculty of Engineering and Technology, University of Tehran, Iran, yaghoub@ut.ac.ir. 1 S.S. MOHTASEBI, Mohtaseb@ut.ac.ir. 1 A. JAFARI, Jafarya@ut.ac.ir. 1 H. KHALEGHI, Hamid_khaleghi66@yahoo.com. CSBE100240 – Presented at Section III: Equipment Engineering for Plant Production Conference ABSTRACT In this paper we present a new mechanism developed for transmission of power between crossover shafts. The mechanism consists of one drive shaft and one driven shaft, 6 guide arms, and 3 connecting arms. In this mechanism, the angle between the input- and output shafts (crossover shafts) can be varied up to 135 degrees, while the velocity ratio between input- and output shafts remains constant and equal for all angle of rotation, and the maximum input speed is 2000 rpm. We first present the kinematics diagrams and then the equations of design. Simulation results using Visual NASTRAN, Autodesk Inventor Dynamic, and COSMOS motion software showed that this mechanism could transmit constant velocity ratios at all angles formed between the shafts. Finally, tension analysis of the mechanism at 2000 rpm and input shaft torque of 1000 N.m, using ANSYS software, showed that the highest tension occurred in the connecting arms. Keywords: Kinematics diagram, Tension analysis, Visual Nastran, COSMOS, ANSYS. Nomenclature Horizontal length of connecting arm. a (m) Linear acceleration of Point B. a L (m) Joint of guider and connecting arm. B (m) Length of slope of connecting arm. b (m) Height of branch shafts C (m) connecting arm. Rotating shaft of C-C (m) CIGR XVII th World Congress – Québec City, Canada – June 13-17, 2010 1