Abstract
Three-cylinder gasoline engines are increasingly favored by major automobile manufacturers due to their good fuel economy, low manufacturing cost and low fuel consumption. However, the inherent balance problem has an adverse effect on the vibration of the whole engine and even the comfort of the whole vehicle, which limits its application in high-end models. This paper studied the dynamics characteristic of the flexible multi-body system of the three-cylinder gasoline engine crankshaft. A dynamic simulation model of the flexible multi-body system of the three-cylinder gasoline engine crankshaft is established through the flexible treatment of the engine crankshaft. The kinematics and dynamics characteristics of each component of the crankshaft connecting rod system are obtained by analyzing the kinematics and dynamics characteristics of the engine shafting system. The relevant factors affecting the vibration of the engine crankshaft system are studied through the establishment of the analysis model of the torsional vibration of the engine crankshaft. This is of great significance to further improve and optimize the design of the three-cylinder gasoline engine.