PROFILING OF THE OUTER SURFACE OF THE PISTON

Abstract

The piston is one of the main resource-intensive and knowledge-intensive parts of the internal combustion engine. Its design significantly affects almost all indicators of the perfection of the power plant with internal combustion engines as a whole. A correctly designed profile is the main parameter that allows the engine to blow safely during the first starts. The development, production and use of pistons in the primary and secondary markets is impossible without appropriate scientific research that will increase the design and technological capabilities of all interested parties. Pistons for gasoline internal combustion engines of passenger cars will continue to dominate the markets, which is connected with the greening of transport as a whole. This emphasizes the importance of research on the improvement of positive-ignition internal combustion engine pistons. Rational profiling of the outer surface is an important task for improving the design of the piston. The diagram of the design creation technology, which was adopted by JSC "AVTRAMAT" (Kharkiv Plant "Porshen") as the standard of the enterprise, according to which pistons were created, which were then supplied to factories of the engine-building industry and for spare parts, is given. The profiles of the side surfaces of the pistons of automobile internal combustion engines, which were designed and implemented in production, were analyzed. The analysis was carried out for pistons with a diameter of 72 to 100 mm and a height of 45 to 73 mm. It is shown that the given profiles of the side surfaces in these pistons are geometrically similar both along and perpendicular to its axis. It is shown that the geometric shape of the profile can be described by polynomials of the 3rd and 4th degree, which allows for easy further use. This can be used when designing the profiles of future structures. Formulas and an algorithm are given, according to which it is possible to calculate the external profile of pistons of automobile reciprocating internal combustion engines according to 2 parameters - diameter and height.