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1
Content available The Szymkowiak’s over-expanded cycle in the rocker engine with the variable compression ratio - kinematics
Szwaja Stanisław, Szymkowiak Mirosław
Combustion Engines
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2022
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R. 61, nr 2
68--72
EN
The article discusses the innovative concept of the over-expanded thermodynamic cycle, the author of which is the Polish engineer-designer Mirosław Szymkowiak. This cycle is realized on the basis of a new and innovative, previously unknown design, of a piston-crankshaft linkage mechanism with the aid of an additional element known as a rocker arm. Additionally, the proposed mechanism allows for a smooth change of the compression/expansion ratio of the engine during its operation. In the beginning, the earlier conceptions of the rocker engine developed by Szymkowiak were presented, and then the main construction assumptions and kinematic calculations were described. It was confirmed, that the developed linkage has big potential in improving the engine's thermal efficiency by approximately 12% relative. Additionally, it significantly reduces the exhaust gas pressure, when the exhaust valve is opened, therefore, contributes to the reduction of the noise emitted by the engine.
2
Content available New concept of a rocker engine - kinematic analysis
Szymkowiak M., Szwaja S.
Journal of KONES
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2012
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Vol. 19, No. 3
443-449
EN
The paper presents concept and design of a four-stroke 4-cylinder internal combustion engine consisted of a single connecting rod to a crankshaft and four additional rods joining pistons with a rocker. The rocker is a specific element in the engine construction that makes this engine different from the typical reciprocating internal combustion piston engine. Furthermore, kinematical analysis of this piston - rocker - crankshaft mechanism was conducted. As concluded from the analysis, this mechanism implemented to the engine, provides several advantages with respect to both dynamic and thermodynamic related issues. First of all, a profile of the piston motion can be easily changed with change in the mechanism geometry e.g. major dimensions of connecting rods, the rocker etc. Thus, the piston motion profile can be asymmetrical with slow motion to and relatively fast distancing from the TDC. This feature can be useful in reducing thermal losses to an engine cooling system. Additionally, the mechanism characterizes itself with low transverse force from the piston, which acts on a cylinder liner. As a result, it significantly reduces frictional losses and should increase the overall efficiency of the engine. Among disadvantages, higher inertial forces are the most important problem. As analyzed, the rocker is the main component that contributes to increase in inertial forces by approximately three to four times. On the other hand, total inertia forces, due to specific kinematical chain of the mechanism, can be remarkably reduced in case the mechanism is correctly optimized.
3
Content available remote The kinematics of the rocker with the forced reciprocating motion of its basic rotational kinematic pair
Przytulski R., Rybusiński B.
Zeszyty Naukowe. Włókiennictwo / Politechnika Łódzka
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2001
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z. 60
45-52
EN
The article contains a general assessment of the kinematics of a complex lever mechanism of two degrees of freedom with the forced reciprocating motion of one of the two rotational kinematic pairs of the rocker. The work is concerned with the determination of the effect of geometry of the system of links, their relative displacements and phase shifts of both drives upon the kinematics of the passive link, i.e. the rocker. The assessment also deals with the kinematics of motion of the connecting rod in the basic system of links, which can also be the executive link of this mechanism.
PL
Artykuł zawiera ogólną ocenę kinematyki, złożonego mechanizmu dźwigniowego o dwu stopniach swobody, z wymuszonym ruchem posuwistym jednego z dwu węzłów obrotowych wahacza. Praca dotyczy określenia wpływu geometrii układu ogniw, ich względnych przemieszczeń i fazowych przesunięć obu napędów, na kinematykę ogniwa biernego tj. wahacza. Ocena dotyczy także kinematyki ruchu łącznika w podstawowym zespole ogniw, który może być również ogniwem wykonawczym tego mechanizmu.
4
Content available remote Dependence of the cam follower loading on the system elasticity
Zajączkowski J.
Zeszyty Naukowe. Włókiennictwo / Politechnika Łódzka
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2001
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z. 60
63-69
EN
The paper is concerned with the problem of dependence of the loading of the cam mechanism on the elasticity of its elements. The mechanisms with rigid elements, with spring mass system, with an elastic cam shaft and with the elastic rocker shaft are studied. The motion of the mechanism is described by nonlinear differential equations. The moment acting on the rocker is calculated and plotted.
PL
Praca dotyczy zagadnienia zależności obciążenia mechanizmu krzywkowego od sprężystości jego elementów. Badane są mechanizmy z elementami sztywnymi, ze sprężystym wałem krzywkowym, ze sprężystym wałem popychacza oraz z układem drgającym złożonym z masy i sprężyny. Ruch mechanizmu opisany jest za pomocą nieliniowych równań różniczkowych. Moment działający na popychacz, wyznaczony po rozwiązaniu równań różniczkowych, jest przedstawiony wykreślnie.
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