A method for ensuring uniform piston stroke by long-range arrangement of cylinder axes.

Abstract

This article analyzes the conditions for the occurrence of an additional bending moment, which is the main factor limiting the development of engines with trailer connecting rods. As presented by the authors in previously published works, an additional bending moment occurs when the piston is in the side cylinder at the end of the “compression” stroke and at the beginning of the “power” stroke. A literature review and research covering up to forty years of data allows us to confidently assert that the angle between the side cylinder axis and the longitudinal axis of the connecting rod can be considered the key parameter that determines the conditions for this angle's occurrence and significantly influences the engine's technical characteristics.. In addition, in accordance with the recommendations presented in the technical literature, when creating V-shaped engines with trailer connecting rods, one of the main recommendations is that a decrease in the trailer length improves the operating conditions for the couplings in the crank mechanism and the engine as a whole. This statement is confirmed by the graphical construction of the axes: trailer; the connecting rod; the side cylinder, when the shorter trailer length allows for an increased connecting rod length and, consequently, a reduced angle between the longitudinal axis of the connecting rod and the axis of the side cylinder. In this article, using the V-2 engine as an example, the authors determined the geometric characteristics of the crankshaft mechanism components, as well as their relative positions within the crankcase. This makes it possible to determine the actual angle between the side cylinder axis and the connecting rod axis, assuming the crank and side cylinder axes are aligned. The numerical value of this angle serves as a performance criterion for the crank mechanism and the engine as a whole. Furthermore, knowledge of the angle allows for the adjustment of the timing of the primary and main fuel injection phases when implementing a two-phase fuel system