Kinematic analysis of a piston internal combustion engine with a rocker-slider mechanism

Abstract

The current state of development of the automotive industry is characterized by high requirements for fuel efficiency, environmental friendliness and reliability of internal combustion engines (ICE). Despite the active use of electric vehicles, piston ICEs remain the main source of mechanical energy in most vehicles. One of the key areas for increasing their efficiency is to reduce mechanical losses, minimize inertial loads and improve the kinematic characteristics of the crank mechanism (CKM), which provides the appropriate technical and operational characteristics of these engines.

The current trends in the improvement of crank mechanisms are analyzed and it is established that for each specific case, an appropriate engineering calculation method is required, which takes into account all the features of the modernized design of the crank assembly.

The method for calculating the kinematics of the rocker-slider mechanism of a piston ICE, which was developed by a team of scientists from the National University of Water Management and Environmental Management, is presented. Expressions for determining the piston displacement, its speed and acceleration depending on the angle of rotation of the connecting rod (crank) are obtained. The results of analytical studies of this engine are presented and graphical dependences of the piston displacement, speed and acceleration on the design parameters of the rocker-slider mechanism are obtained.

The results obtained confirm the prospects of using the rocker-slider mechanism as an alternative for internal combustion engines with a traditional rocker-slider design. The proposed methodology can be used for further research into dynamics, optimization of design parameters, and design of new piston internal combustion engines with improved characteristics and greater efficiency.