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EN
The mathematical model for calculating the response time of the compression ratio of the mechanism for compression ratio changing (MCRC) is presented in this article. This revealed the influence of various engine factors with the connecting rod and crank mechanism (CRCM) on the operation of the MCRC (for example, the rate of the compression ratio change). The results of the study of the operation of the MCRC indicate a strong influence of the values  (relative area of flow passage of channels) and р (pressure) on the response time τ in the field of their small values. This indicates that with insignificant changes of the area of flow passage of channel of the hydraulic lock and the minute oil pressure in the cavities, a significant response rate of the MCRC is ensured. The results demonstrate the possibility of speedy compression ratio change in the engine with the MCRC. Calculation studies showed that the mechanism full operation occurs quickly (0.02 s per unit εx), which indicates the expediency of using such a high-pressure pump in a four-stroke gasoline engine with CRCM. The mechanism movable body complete movement (S = 4 mm) at the oil temperature in the hydraulic system of 45°C and pressure on the body of p = 60 bar are stated to occur for 0.2 s.
PL
Przedstawiono model bryłowy i obliczenia silnika Stirlinga typu alfa. Scharakteryzowano podstawowe typy silników Stirlinga. Zaprezentowano model I rzędu (model Schmidta) obiegu termodynamicznego dla wybranego silnika, na podstawie którego dobrano warunki obciążenia dla zbudowanego modelu bryłowego tego silnika. Przeprowadzono statyczną analizę wytrzymałości mechanizmu roboczego silnika z korpusem dla trzech położeń wału korbowego z wykorzystaniem metody elementów skończonych. Przedstawiono wybrane wyniki badań numerycznych modelu mechanizmu roboczego silnika z korpusem w postaci mapy naprężeń zredukowanych wywołanych zadanym ciśnieniem czynnika roboczego. Na ich podstawie wykazano poprawność konstrukcji mechanizmu roboczego silnika i jego korpusu według przyjętego kryterium wytrzymałościowego.
EN
The solid model and calculations of the Stirling engine of alpha type are presented. The basic types of single acting Stirling engines (called as: alpha, beta, gamma) are characterised. The first order model (Schmidt’s model) of the thermodynamic cycle for the selected engine is shown. On its basis, the loading conditions for the constructed solid model of this engine are chosen. Static analysis of the strength of the working mechanism of the engine and its body is carried out for three positions of the crankshaft (for the upper position of the piston in the cold cylinder, aberration of the crankshaft by 30 degrees from the upper position of the piston and aberration of the crankshaft by 90 degrees from the upper position of the piston). The calculations are made using the finite element method (FEM). Selected results of simulation studies of the FEMmodel of the working mechanism of the engine and its body in the form of reduced stress maps in the model under specified pressure of the working medium are presented. On their basis, the correctness of the structure of the modelled working mechanism of the engine and its body has been demonstrated according to the adopted strength criterion.
EN
Mathematical model of change of equivalent moment of inertia of V-type crank-connecting rod mechanism of piston internal combustion engines from the angle of swing of crankshaft is proposed All wide-spread schemes of V-type crank-connecting rod mechanisms are analyzed, and adequacy of the given models in KOMPAS-3D V8 system is checked.
4
Content available remote Bearings of IC engine crank mechanism - selected tribological problems
EN
The correct operation of crank mechanism bearing nodes is the one of engine reliable run decisive factors. The need for detailed analysis of bearing run conditions results from high demands that should be met by modern engines. Since mating surfaces of journal and shell as well as dividing oil film constitute an integral whole, all problems concerning this assembly should be analyzed taking into account their interdependence. The paper deals with some problems encountered during crank mechanism run, i.e. problems concerning the choice of material, structure of mating surfaces, kind of friction, viscosity of applied lubricant in order to reduce wear and guarantee the reliable operation within the whole engine life. Presented examples of problems mentioned in the paper originate partly from bearing manufacturers and from simulations based upon the hydrodynamic theory of lubrication. However, authors are of the opinion that these problems are merely the part of wider subject of friction, wear and lubrication.
5
EN
Friction losses generated in kinematic nodes of IC engine, especially those in piston-cylinder assembly, affect the engine total efficiency to the considerable degree. Analytical determination of those losses using mathematical models of engine selected kinematic nodes requires verification carried out on real objects. These can be material models of these objects or engines appropriately arranged for measurements alike. This paper presents methods of determination of losses generated at some kinematic nodes of engine as well as ways of result verification.
6
Content available remote Analiza uszkodzeń elementów mechanizmu korbowego silników okrętowych
PL
Przedstawiono analizę warunków wynikających z wadliwego działania rozpylacza, które mogły doprowadzić do przeciążenia cieplnego i uszkodzenia denka tłoka. Załączono wyniki obliczeń, wskazujące na uzależnienie parametrów strugi rozpylonego paliwa od stanu technicznego otworków rozpylacza. Omówiono przypadki uszkodzeń śrub korbowodowych oraz stopy korbowodu i określono możliwe przyczyny tego typu uszkodzeń.
EN
The effect of faulty operation of the injector has been discussed. The conditions resulting from the defect may lead to thermal overloading and damage to the piston crown. The results of calculations have been presented. They show the effect of the state of injector nozzle on the characteristics of the fuel spray cone. Several examples of connecting rod bolts damage and its possible causes have been discussed.
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