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The following prototypes in 1999 worked on since the Industrial Arts Education Faculty of Gazi University, Department of Industrial Technology Education within the scope of the master's thesis in 2003 and 2005 produced by Aksoy rare. Gazi University Scientific Research Projects (BAP) was supported by the. Project Coordinator, Deputy Dean, Faculty of Gazi University, Technical Education Faculty, Department of Automotive and Mechanical Education Department, and the venerable teacher advisor DC. Dr. Jacob has served İÇİNGÜR would like to thank him.

Elliptical engine volumetric efficiency and power by two times more weight (0.4 kg / kW) which (again, across an elliptical, but with every revolution of the main shaft to perform the second duty cycle at the same time when the shaft is completely eliminated pneumatic motor can be used as removed and the valve mechanism is still in use), a system designed shape. For this reason, I pulled back the elliptical engine patent application. The system can fulfill my terms for the production of other sponsoring companies or angel investors can accept that.



In the conventional internal combustion engines, the elements of linear movement cause the friction power to increase the production cost due to the fact that they require meticulous manufacturing and cause vibration. The intake valves, which are small relative to the diameter of the cylinder, cause the volumetric efficiency to decrease. In the two stroke engines, in which the number of work per cycle is increased, power output per unit volume (kW/liter) is higher but specific fuel consumption is considerably lower.
In this study, an alternative elliptic internal combustion engine is designed and its prototype is manufactured, in which crankshaft, camshaft and valve mechanism are not used. The three dimensional solid modeling and simulation of the engine was performed in 3D Studio Max 5.1.
The elliptic engine works on 4 stroke Otto cycle basis. But cycle is completed in 360 degrees. First prototype was manufactured and proved workable. Problems have been designated. It was anticipated that by eliminating the problems that effect the running of the first prototype problems some advantages could be achieved such as improved manufacturing economy, increase in the mechanical efficiency and decrease in the specific fuel consumption for second prototype. Patent application of this new engine has already been made.

Keywords : Alternative engines, elliptic engine, internal combustion engine



Connecting rod, crankshaft, camshaft and valve train components, such as linear motion, obtained by conventional internal combustion engines of power wasted for the friction losses are a part of the manufacturing economy to deteriorate and cause over vibration. In addition, the cylinder diameter smaller than the diameter intake valves, which reduces the volumetric efficiency. Two-stroke engines, the intake, compression, power and exhaust stroke are all interconnected due to the fact, the specific fuel consumption rate of increase is higher than the rate of increase in the power of l.
this study, the connecting rod, crankshaft, camshaft and valve train components such as the linear motion and their associated gear used, an alternative to air-cooled engine design and prototype has been manufactured elliptical. 4-stroke Otto cycle engine working according to an elliptical, a duty cycle of 360 degrees per cycle is performed for each cylinder, four-time independent of each other.
Manufacturing and problems related to operating parameters were determined. This is one of the problems the formation of compression leakage between the cylinder block and timing shaft. Manufacturing economy through the elimination of this problem, such as the mechanical advantages of improved efficiency and reduction of specific fuel consumption could be obtained.


Figure 2.1 shows the pistons in the cylinders, as shown, an elliptical form to guide movements of the inner side form the combustion chamber. The compressed fuel-air mixture in the combustion chamber due to pressure resulting from the burning of the pistons, while leaving the cylinders rotate the cylinder block. The pressure in the combustion chamber, elliptic grid domain variable that it angles, which is connected to the pistons move within the inner wall, and thus guide marbles returned to the cylinder block rotates around its own axis. Rings in the cylinder block, pistons and timing shaft prevents leakage of the combustion chamber between the compressed fuel-air mixture.

Alternatif Motorlar Buluş İcad İcatFigure 2.1. Parts

To allow fuel into the cylinders and intake duct to the air inlet and outlet of the exhaust gases in the cylinders and the shaft at both ends of the exhaust system that allows the fuel-air intake and exhaust outlet in Figure 2.2 can be seen. The fuel-air intake side of the carburetor connection is made.

Motor İcadFigure 2.2. Time Shaft



1. Time (0 - 90 degrees): Figure 2.3.a) as shown in the first movement of the cylinder block is rotated to give. The effect of the centrifugal force of the pistons and cylinder springs are pushed outside. 1. roller, this roller comes in front of the suction duct in Figure 2.3.a), the suction stroke begins, in Figure 2.3.b) and continues in Figure 2.3.c), the ends. During this period, 1 rotates 90 degrees to the cylinder and the suction channel of the fuel-air mixture entering the 1 filled cylinder. Figure 2.3.a), the 2 cylinder, completes the compression period. At this point, the spark plug firing time begins to do business with, Figure 2.3.b) going on in and Figure 2.3.c), it ends in. During this time, 2 realizes a 90-degree turn in the cylinder.

Alternatif Motorlar Buluş İcad İcatFigure 2.3. 1. Time

2. Time (90 - 180 °): Figure 2.4.a) as shown in the suction kanılını 1 time for the intake and compression cylinder takes place over time. Compaction time, Figure 2.4.b), the ends. Figure 2.4.a) a. 2. cylinder, the exhaust gases inside the exhaust duct by removing the front forms the exhaust stroke. The exhaust Figure 2.4.b), the ends.

Motor İcadFigure 2.4. 2. Time

3. Period (180 - 270 degrees): Figure 2.5.a) 1 as shown in realizes the time of the cylinder business. Working Time Figure 2.5.b) up to continue. 2. cylinder, Figure 2.5.a) a suction extraction duct on the time of movement while still realized. Figure 2.5.b suction stroke), the ends.

Motor İcatFigure 2.5. 3. Time

4. Period (270 - 360 degrees): Figure 2.6.a) 1 as shown in cylinder on the exhaust port while the movement is taking out of the exhaust gases inside the channel. Exhaust time Figure 2.6.b) up to continue. 2. cylinder, Figure 2.6.a) performs the time compression. Compression time in Figure 2.6.b) up to continue.

Alternatif Motorlar Buluş İcad İcatFigure 2.6. 4. Time


Timing diagram of the elliptic engine

Figure 2.7 shows the timing diagram of elliptic engine. As is evident, for an elliptical cylinder engine of 360 degrees in a duty cycle of each cycle is composed of all.

Alternatif Motorlar Buluş İcad İcatFigure 2.7. Timing diagram of the engine has



Modeling calculations were made which are necessary for the project in Microsoft Excel XP program file is used for calculations are given the thesis on CD October 1.

First, we can benefit and manufacture of ready-made parts in mind the other parts of these measurements was taken into consideration in reference size measurements revealed that the parts are ready. In this context, and used primarily investigated the smallest rings are four-stroke engine segment ready for GX 22 series Honda generator was found that the 33mm ring group. Another ready-piece with the spark plug 847 DJ8J range of 43 mm, the paint was found to be small.

Parametric calculations

Alternatif Motorlar Buluş İcad İcatFigure 3.1. Parametric calculations are done in Microsoft Excel

Thermodynamic Analysis

Otto cycle is based on the calculations. Otto cycle in Figure 3.15 consists of transactions in the PV and TS diagram.

Alternatif Motorlar Buluş İcad İcat
3.15. PV and TS diagram of the Otto cycle

Otto cycle, also known as a cycle at constant volume of modern diesel engines, are regarded as the theoretical cycle. The procedure consists of two isentropic and two constant volume cycle.

Figure 3.15 Teki cycle between points 1 and 2, as shown isentropic compression phase in question. P1 is the pressure at the beginning of this phase, the temperature and volume V1'dir Ti. Finally, reaching the maximum compression pressure P2 position, temperature T2 and the volume is V2. Then, the operation from an external source to article 2 to 3 for the duration of the heat given constant volume of gas at the end of compression temperatures and pressure are removed several times. The operating material is then work expanded to the isentropic up to the point 3 to point 4 is obtained. Finally, the operation under Article 4 to 1 between the points with constant volume by removing the heat cycle is completed.

Assumptions and values ​​are given:
Working fluid is air that is considered a perfect gas.
heat transfer in the cycle do not occur within the walls of the container.
the cycle heat addition or heat removal cycles carried out with the help of an outside source.
cycle is complete, the fluid will have the same characteristics Kavuşacağından q = w.
Stoichiometric Mass Air / Fuel Ratio = 14.93
fuel density = 747 kg/m3

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Created to analyze the movements of the parts and to develop different alternatives for the 3D Studio MAX 5.1 3D solid modeling operations. program is preferred. Later in the same program as the mechanical system simulations were made for interoperability. Figure 4.1 shows an operation screen for the program. Movements and positions can be determined more easily created simulations of motor parts. In addition, the simulations of gas-exchange transactions made.

Alternatif Motorlar Buluş İcad İcatFigure 4.1. 3D Studio MAX 5.1 of the engine in the modeling and simulation



Three-dimensional solid modeling of parts of the body, the cylinder block and wooden models of time before the shaft was to be made. The parts, made ​​of models have been prepared. Cast aluminum for the body material, the cylinder block 25 for the GG, the time series of GGG 70 ductile cast iron materials are used for shaft.
Casting engine parts (body, when the cylinder block and shaft) and other metal parts are made ​​in the market for the project. Aluminum has been used for the piston. Piston balls have been supplied.
the installation, after the prototype is used as fuel for the operation.

Alternatif Motorlar Buluş İcad İcatFigure 5.1. Cancellation of Laser Registration Template in

Alternatif MotorlarFigure 5.2. Body Model Generation

Alternatif MotorlarFigure 5.3. Cylinder Block

Alternatif Motorlar Buluş İcad İcatFigure 5.4. Track (Rail)

Motor BuluşFigure 5.5. Piston Group

Motor BuluşFigure 5.6. Cylinder liner

Motor BuluşFigure 5.7. Cylinder Block and cylinder liners

Motor BuluşFigure 5.8. Cylinder Block and cylinder liners

Motor BuluşFigure 5.9. Time Shaft

Motor İcatFigure 5.10. Time Shaft

Motor İcatFigure 5.11. Time Shaft



Comparison of conventional internal combustion piston engines, the engine elliptic elliptic engine benefits listed below have been identified. These are:
• Crankshaft and gear, camshaft and dişilisi, manifolds, valves and other linear motion elements supaplarla and cooling water used in conjunction with the relevant parts there:
less friction losses,
mechanical efficiency is higher,
lighter than the mass of the engine,
easier Productions and cheaper,
easier assembly and disassembly,
prone to failure is lower,
maintenance and repairs easier and less expensive,
less energy required for the first movement,
vibration value is lower.
• a duty cycle of 360 degrees takes place Elliptic engine,
the engine output power 2 times higher,
the bulk power ratio (kW / kg) 2-fold higher,
dead spots created by the masses of the pistons during a change is less than the negative effects of inertia forces. Thus, a more balanced motor rotates,
the pistons does not affect other elements of the linear movement of the engine, thereby significantly decreasing vibration and power loss,
the engine works more quickly.
• The air-cooled. The motor for the cooling water is not required.
• the cross sectional areas of inlet and exhaust channels being up to approximately the diameter of the cylinder due to a higher volumetric efficiency.


In this study, the elliptical engine parametric calculations, design, modeling and simulation were performed. The prototype produced as a result of the parametric calculations, a total of 132 cc four-cylinder and an elliptical cylinder engine with a theoretical volume of 3000 rev / min 10.2 KW of generating power.
virtual environment simulations to optimize the conditions for the first workable prototype has been manufactured, installed and operated . Due to some problems related to manufacturing tolerances during the manufacture could not be precise. Guide at the beginning of these problems is the manufacture of which has an elliptical shape.
second prototype grid, vertical processing machines have been manufactured and the piston, when the shaft is closest to the work space is used more precise tolerances.
made ​​of two elliptic prototype engine, the problems related to manufacturing technology case analysis has the potential to create an important alternative to conventional internal combustion engines.
also register with the design by changing the variable compression ratio and piston inside the cylinder during combustion engines can be designed able to push hard throughout the course.

Fixed Compression Ratio

Variable Compression Ratio Track Design

Flexible Track
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