927 IAA-AAS-SciTech2019-110 AAS 19-1034 POWER CALCULATION OF MODERN ENGINE MECHANISMS TAKING INTO ACCOUNT OF THE DESAXIAL Vallejo Maldonado, * Kambiz Souri, † Nikolay D. Chaynov ‡ and Vladimir V. Gusarov § The article deals with balancing of 5-cylinder four-stroke engines of the VR type with a desaxial crank mechanism and uniform alternation of flashes. Formulas allowing to find and analyze the inertial forces of the reciprocating moving masses and moments of these forces occurring in the VR-5 engines for any giv- en value of the angle of the collapse of cylinders, the ratio of the crank radius to the length of the connecting rod and the relative displacement of the axis of the cylinder are given. A method of balancing the moments of inertia forces of rotat- ing and reciprocating moving masses are proposed. * Associate Professor of Department of Mechanical Engineering and Instrumentation, RUDN University, 6, Miklukho- Maklaya Str., Moscow, Russia, 117198. † Assistant Professor of Department of Mechanical Engineering and Instrumentation, RUDN University, 6, Miklukho- Maklaya Str., Moscow, Russia, 117198. ‡ D. Sc (Eng.), Professor, Department of Piston Engines, Bauman Moscow State Technical University, Baumanskaya str. 2-ya, 5/1, Moscow, 105005. § Ph.D. (Eng.), Professor, Department of Power Installations for Transport and Small Energy, Moscow Polytechnic University, Bolshaya Semyonovskaya Str. 38, Moscow, 107023. INTRODUCTION In the modern automotive industry, in some cases, five-cylinder four-stroke internal combus- tion engines (ICE) with a working volume of 2.3...3.0 liters are used as power units. In such cas- es, the optimal use of a constructive design of the VR-5 type, which has particularly high com- pactness: the length of such an internal combustion engine is significantly smaller than in-line, and at a small angle of collapse ( = 8…20˚), unlike V-shaped engine, it can have a single head for all cylinders (Fig. 1). The peculiarity of this type of internal combustion engine is not the only asymmetry in the number of cylinders in the left and right blocks, but also the presence of signifi- cant desaxial (size e in Fig. 1), which is necessary for structural reasons (in particular, to facilitate access to the bottom heads of connecting rods). Moreover, the desaxial in the right and left blocks is multidirectional. Usually, dynamic analysis of crank-drive mechanisms (CM) of automobile internal combustion engines are carried out without taking into account the des-axial because of its smallness, but in this case such account is practicable, because the relative value of desaxial in VR-5 engines exceeds by an order of magnitude the values typical for similar automobile engines of other kinematic circuits. All of these factors causes the increased complexity of the dynamic analysis of this type of internal combustion engine. Below are the results of the dynamic study of the VR-5 engine using analytical, software and graphical methods (References 7, 8, 9). c g