Estudo de viabilidade de válvula secundária rotativa de movimento intermitente para MCIs

Abstract

The high competitiveness and demand of consumer market has made the automotive industry seeks to develop improvements on their products. One of these improvements is the searching of motors more efficient in order to be more economic, less aggressive to the environment and that comply with government legislation. To improve the efficiency of an engine, a new head was developed consisting of a conventional main valve and two secondary rotary axial inlet and exhaust valves actuated by a Geneva intermittent movement mechanism and to perform flow tests on the model using Solidworks’ Flow Simulation module. The cylinder head used as a base is from a Volkswagen 1.6 AP carbureted engine, with 049H camshaft and Conical seat disc valves. Simulations were carried out with the original and the proposed heads and in the end the values were compared to each other. The proposed model presented 121% maximum flow increase 5o after top dead center. The absolute maximum flow was 109.54CFM in a range of 30o higher than the original Keywords: Rotary axial valves, Geneva mechanism, engine, intermittent movement.