WO2005026511A2

WO2005026511A2 - Small fuel power plant and use thereof in a compound system, and opposed-piston engine therefor

Info

Publication number: WO2005026511A2
Application number: PCT/DE2004/002065
Authority: WO
Inventors: Otto Daude; Joachim Pfund; Joachim Simon
Original assignee: Otto Daude; Joachim Pfund; Joachim Simon
Priority date: 2003-09-18
Filing date: 2004-09-17
Publication date: 2005-03-24
Also published as: EP1673522A2; WO2005026511A3; DE10343192A1

Abstract

A small fuel power plant (10) comprises a combustion engine (12), which emits an exhaust gas (18) resulting from combustion, whereby the combustion engine (12) has a mechanical efficiency of at least 50 %. The small fuel power plant also comprises at least one generator (20, 22), which is coupled to the combustion engine (12) and which serves to generate current, and comprises an active heat exchanger (26) that is integrated in a buffer storage. The exhaust gas is either diverted around the heat exchanger via a bypass or guided through the heating device contained inside the heat exchanger. The thermal power supplied to the buffer storage can be increased by feeding fuel into the heating device.

Description

Small fuel power plant and use of one or more of these small fuel power plants in a composite system and counter-piston engine for such a small fuel power plant

Field of the Invention

The present invention relates to a small fuel power plant for use in stand-alone operation or in a composite system. In addition, the present invention relates to a counter-piston engine for preferred use in such a small fuel power plant.

State of the art

For reasons of climate protection, a significant reduction in the emissions relevant for climate protection is required. These relevant emissions are, in particular, so-called greenhouse gases such as carbon dioxide, methane, nitrogen oxide, fluorocarbon and the like.

A significant proportion of greenhouse gases result from the combustion of fossil fuels such as coal, oil and natural gas. In order to achieve the global reduction in CO2 emissions, measures must be taken to reduce emissions, particularly in the energy sector. For a long time, nuclear power was seen as one way of reducing CO2 emissions because, in comparison to other types of power plants, it hardly produces any CO2. Based on the However, current developments in many countries are expected to end the use of nuclear power within the next few decades, so that this solution does not offer a future-oriented option.

Against this background, efforts are being made to reduce CO2 emissions from power plants with higher electrical efficiencies, combined heat and power, CO2-free electricity generation and by using renewable energies.

These measures also include the more efficient conversion of primary energies (coal, petroleum, natural gas) into secondary energies (electricity, heat). In this context, combined heat and power plants (CHP) are known, which have a significantly higher overall energy efficiency due to the combined heat and power than conventional power plants or also CHP plants.

In this context, the term combined heat and power plant stands for decentralized power generation systems driven by internal combustion engines with simultaneous use of waste heat. In contrast to HKWs, the waste heat and at least parts of the electricity generated are consumed directly on site.

Proven internal combustion engines such as gasoline and diesel engines are primarily used as internal combustion engines in the known combined heat and power plants. In such systems, the ratio between the heat generated and the electricity generated is a fixed quantity and cannot be easily adapted to the respective needs. It is therefore necessary to decide which of the two forms of energy generated should be used as a control variable for the operation. In the case of the known combined heat and power plants, a heat-controlled mode of operation is mostly used, ie the need for heat from the consumer decides whether and with what output the internal combustion engine is operated. In the well-known combined heat and power plants, electricity and heat fall always at the same time (coupled), whereby the heat removal is decisive in order not to thermally overload the internal combustion engine or the heat engine.

In known combined heat and power plants, the operation of the system is only satisfactory from an economic point of view if there is sufficient heat demand beyond the heating period. Since the internal combustion engines of the known combined heat and power plants have a comparatively low mechanical efficiency and the heat losses, i. H. the usable waste heat, are relatively large, the high economy results mainly from the use of this waste heat. For pure electricity generation, this type of power plant in its previous design is rather uneconomical compared to conventional power plants.

Summary of the invention

The invention has for its object to provide a small fuel power plant that can be used flexibly.

This object is achieved by a small fuel power plant according to claim 1 and its use according to claim 13 and by a counter-piston engine according to claim 19. Preferred embodiments follow from the remaining claims.

The invention relates to a small fuel power plant with flexibly coupled power and heat generation and the use of one or more of these

Small-scale fuel power plants in a network system that is flexible in its control and regulation, allows economical CO ₂ -reduced power generation and at the same time can cover a correspondingly necessary heat requirement. In addition, the subject of the invention is to propose and optimize an internal combustion engine which is particularly suitable for use in a small fuel power plant according to the invention.

The present invention describes a

Small fuel power plant comprising an internal combustion engine that has a mechanical efficiency of at least 50%.

The internal combustion engine is ^' directly or indirectly coupled to at least one generator for power generation. Direct is to be understood to mean that the generator is connected directly to a crankshaft of the internal combustion engine. Both synchronous generators and asynchronous generators can be used as generators.

Also includes. the small fuel power plant has at least one active heat exchanger, by means of which heat can be extracted from the exhaust gas. The exhaust gas routing is integrated in the active heat exchanger.

In addition, a heating device is integrated into the active heat exchanger, by means of which heat can be supplied to the exhaust gas. This makes it possible to cover a possibly increased heat requirement for which the temperature of the exhaust gas would not be sufficient after leaving the internal combustion engine.

The producible electrical output and thus the electrical efficiency of the small fuel power plant depends directly on the mechanical efficiency of the

Internal combustion engine. If the mechanical efficiency is high, a high electrical output can also be achieved relative to the amount of energy introduced. In the case of combined heat and power plants in the prior art, tried and tested engines are used, but one have comparatively lower mechanical efficiency. The high overall energy efficiency of known combined heat and power plants comes about through combined heat and power generation, i.e. through the fullest possible use of the waste heat. If there is little or no heat demand, such cogeneration plants can only generate electricity in an uneconomical manner. In contrast to this, the present invention makes it possible, owing to the use of an internal combustion engine with a mechanical efficiency of over 50%, to create a small fuel-fired power plant with flexibly coupled power and heat generation which, even with little or no heat requirement, achieves an electrical efficiency which is economical Operation with environmentally friendly power generation guaranteed.

If there is a heat requirement in addition to the electricity requirement, the waste heat generated during the combustion, which is predominantly contained in the exhaust gas, can be used, which further improves the overall energy efficiency. If the heat requirement cannot be met by the waste heat, the exhaust gas can be heated further economically by means of the heating device.

According to a preferred embodiment of the present invention, the internal combustion engine is a counter-piston engine. The counter-piston engine is characterized by a high mechanical efficiency, ie in the counter-piston engine a large part of the heat generated during combustion is converted into mechanical energy, which is why the exhaust gas temperature is low compared to a conventional diesel or gasoline engine. This automatically leads to an improved mechanical efficiency, which in turn has a direct influence on the electrical efficiency. As a result, the electrical efficiency in the case in which there is no or only a low heat requirement, ie only electricity is to be generated, is higher in comparison to the conventional combined heat and power plant and the economy of the Small fuel power plant with essentially exclusive electricity production is improved.

The principle of the counter-piston engine requires two external crankshafts. Each of the two crankshafts can be equipped with its own separate generator.

The internal combustion engine can be technically designed for operation with gaseous, liquid or powdered fuels. Liquid fuels are, for example, petroleum or other fuels of biogenic origin, such as vegetable oils (rapeseed, palm, mustard oil and used fat) or esterified forms thereof (vegetable fat or used fat methyl ester). Gaseous fuels are, for example, natural gas, biogas or synthesis gas. Wood flour or coal dust could also be used as solid or powdered fuels. However, natural gas is preferably used, which is favorable in terms of the undesirable CO2 emissions.

In a further embodiment of the present invention, the active heat exchanger is integrated in a buffer store (for heat / steam). In this context, a buffer tank is to be understood as a kind of hot water boiler, for example. The term is also intended to include a steam generator / store. The integral design enables a compact unit to be created that can be set up in a space-saving manner in residential buildings or other buildings.

The heating device in the active heat exchanger is preferably a combustion chamber which is connected to the exhaust pipe, so that the exhaust gas can flow into the combustion chamber. For heating, a fuel is supplied to this combustion chamber, which can be the same as the fuel of the internal combustion engine or also different. A combustion in the combustion chamber turns the exhaust gas into heat fed. The amount of fuel is regulated according to the heat requirement. Such a configuration achieves a high level of energy efficiency. This is due to the fact that preheated oxygen is fed to the combustion chamber together with the exhaust gas, which promotes combustion accordingly. This advantage comes into play because the drive unit (combustion engine) is operated with excess air. In addition, by designing the heating device as a combustion chamber, any residual fuels which are still present in the exhaust gas and which have not been completely burned in the internal combustion engine can be burned almost completely, which in turn increases the overall energy efficiency of the system and reduces undesirable ones Emissions.

A by-pass line, which leads the exhaust gas past the active heat exchanger and directs it directly into the chimney, enables flexible operation. In this case, the waste heat is not used.

The small fuel power plant of the present invention may include a control device that controls the performance of the internal combustion engine depending on the power requirement. The excellent mechanical efficiency of the internal combustion engine makes it possible for the power with which the internal combustion engine is operated to be regulated solely on the basis of the electricity requirement.

The same or a separate control device advantageously controls the flow of the exhaust gas and the operation of the heating device depending on the heat requirement. By means of this and the above control device, an operation of the small fuel power plant largely decoupled from the heat requirement can be realized.

According to the present invention, the use of a previously described small fuel power plant in one Network or network system proposed. The amalgamation of

Small fuel power plants in power-consuming plants with other power plants and power feed-in points can be understood via a central control room or control in a supply area. Through the use of several inventive fuel in a small power plants ^■ composite system, the power demand can be covered almost slidably. At the same time, voltage fluctuations can be smoothed out, so that liability ^" for voltage fluctuations and power failures can be reduced. The small fuel power plants are operated in the network system under full load or in standby, so that in the network a higher electrical efficiency and a reduced fuel consumption The standby operation is the result of the buffer storage (heat / steam) and the power supply from the low-voltage network. It is also advantageous that when controlling and monitoring the small fuel power plants in the Less fuel power and network capacities need to be built The small fuel power plants provide in a network system small building blocks with low electrical power of 10kW and 200kW, which an almost sliding, needs-based capacity building / reduction without capacity check Revision and maintenance can be organized in an economically advantageous manner through a large number of small fuel power plants according to the invention in a network.

The network system includes (as mentioned above) small fuel power plants in electricity consumption plants, regional power plants and the national electricity supply, which are monitored and controlled / regulated by a control room. The control room monitors and regulates the feeding of electricity into the network according to the electricity requirement, taking into account the specific parameters of the electricity supplying facilities. The specific parameters include, for example, the current electricity generation and purchase costs as well as the network characteristic.

The small fuel power plants according to the invention are advantageously used to cover peak loads. The network system has the task of to cover the peak loads. Among other things, can be achieved that the expensive peak load current can be provided almost sliding from the region in which the peak load occurs, at comparatively lower prices.

The network system can be, for example, an internal, a regional (supply area of municipal utilities) or a national network system.

According to the present invention, a counter-piston engine is also proposed, which is particularly suitable for use in small fuel power plants according to the invention. According to a preferred embodiment, the counter-piston engine is designed in such a way that the two crankshafts running in synchronism with speed are coupled to one another via a transmission which is designed in such a way that at least one crankshaft deliberately deviates from a uniform rotary movement. The advantage of this measure is that the small angular range of the crankshafts present in a conventional counter-piston engine (piston position just before / after TDC) within which there is approximately "synchronism" between the leading and trailing pistons can be specifically changed. Within this angular range of "synchronism", the combustion of the fuel takes place in the troughs introduced into the piston crowns. The efficiency of the counter-piston engine can be increased by deliberately influencing the period within which the combustion takes place. The transmission is preferably designed in such a way that the crankshaft of the leading / trailing piston or both is accelerated and decelerated twice during a rotation through 360 °. This measure significantly increases the angular range within which the pistons are "synchronized". Both crankshafts run according to the same speed as before, but the transmission is preferably designed by introducing one or two special intermediate gear pairs with oval (e.g. elliptical) wheels so that on the one hand the synchronous speed of the two crankshafts is maintained, the angular speed of the crankshaft over 360 ° of the leading / trailing piston or both is deliberately inconsistent.

Brief description of the drawings

The invention is described below purely by way of example with reference to the accompanying drawings, in which:

1 shows the block diagram of a small fuel power plant according to the invention with the possibility of flexibly coupled power and heat generation;

Fig. 2 shows the block diagram of the composite control is decentralized _^ ..stallierter, according to the invention fuel-small power plants; and

3 shows a schematic illustration of a counter-piston engine preferably used in a small fuel power plant according to the invention; and

FIG. 4 shows a schematic illustration of an alternative counter-piston engine, which is preferably used in a small fuel power plant according to the invention. Ways of Carrying Out the Invention

In the following figures, the same elements are identified with identical reference numbers.

1 shows the block diagram of a small fuel power plant according to the invention. The small fuel power plant, which is generally designated by reference number 10, with flexibly coupled power and heat generation will also be referred to below as a small power plant. The small power plant 10 has an internal combustion engine which is designed as a counter-piston engine 12.

The counter-piston engine drives one or both generators 20 and 22, which according to a preferred embodiment are asynchronous generators. The generators 20 and 22 are flanged directly to the crankshafts of the counter-piston engine 12. The electrical energy generated by the generators 20 and 22 is fed into the power grid in a suitable manner. The power grid can

Small fuel power plant 10 may only be provided locally if the small fuel power plant is operated as a so-called isolated solution, or else it is the public power grid. Depending on the manner in which the small fuel power plant 10 shown in FIG. 1 is to be operated, in addition to suitable devices for feeding into the network, network monitoring can also take place in the structural unit 24.

Due to the very high mechanical efficiency of the engine, the exhaust gas 18 of the counter-piston engine 12 has a relatively low temperature which can be released directly into the atmosphere when there is no need for heat. This means that, in contrast to conventional CHP plants, the small fuel-fired power plant shown in FIG. 10 can only be operated in accordance with power requirements. If heat is requested, the exhaust gas 18 can be an active heat exchanger 26 run by heating the exhaust gas to a temperature which is economical for the heat exchange and then supplying the heat yield to the buffer store 28. By using the waste heat generated in the exhaust gas 18 during combustion in the counter-piston engine 12, the overall energy efficiency of the small power plant 10 is improved.

As stated above, this can

Small fuel power plant 10 can either be operated as an isolated unit as a so-called island solution, or else can be integrated into a network system, for which purpose the correspondingly required communication interfaces must be provided. Thus, in addition to the control and monitoring 32 of the small fuel power plant 10 to be provided in any case, a communication interface 34 can also be provided, which can be controlled by means of remote data transmission 36 and enables the integration of the small fuel power plant 10 into a network system as described below.

2 shows a schematic block diagram of a network control of many decentrally installed small fuel power plants 10, which are shown schematically with 10a-n and each provide electricity 32a-n and useful heat 30a-n. The small fuel power plants lOa-n can be installed in individual buildings of different customers 40a-n and supply the respective customers with electricity and heat as required. As mentioned above, the heat that can be generated by the small fuel power plant 10 is not rigidly coupled to the electricity generated because the useful heat generated can be controlled separately by the use of the active heat exchanger. If a heating requirement is reported to a small fuel power plant that is at a standstill, it is started up automatically and operated with optimum electrical efficiency until the heating requirement is met. Therefore, both the small power plants lOa-n and the Customers 40a-n are coupled to the low-voltage network 36 of the public power supply of a regional electricity supplier 38. It is possible that electricity 34 from the small fuel power plants (the current 34a from the small power plant 10a is shown in FIG. 2) is fed into the low-voltage network 36 or that the customer obtains electricity 42 exclusively or additionally from the low-voltage network (in FIG 2, the power supply 42a of the customer 40a from the low-voltage network 36 is shown). The regional electricity supplier 38, as operator of the low-voltage network 36, can also feed the low-voltage network via its own power generation 44 as well as via external power supply 46.

In order to be able to operate the entire network control system appropriately, a suitable information flow and regulating and control commands are required, which are shown in FIG. 2 by interrupted arrow lines to delimit the energy flows of electricity and heat shown by solid arrows. The respective small fuel power plants are exchanging information from a central system control room 48, which also communicates with the regional electricity supplier 38, so that the power demand can be covered almost smoothly in the power plant network formed thereby. Due to the availability of many small fuel power plants, voltage fluctuations can also be smoothed out. In the network system shown, the small fuel power plants 10 represent power plant capacities with low electrical power from 10 kW to 200 kW. In particular, the increasingly realized use of solar and wind energy increases the voltage fluctuations in regional networks, which are increasingly difficult to achieve through the connection of a few large power plants are mastered. By integrating the invention

Combining small fuel power plants with network control makes it much easier to eliminate network fluctuations. 3 schematically shows a preferred exemplary embodiment of the counter-piston engine 12, which is preferably used in the small power plant. The counter-piston engine 12 has two external crankshafts 15, the angular position of which is matched to one another. This is achieved via a transverse shaft 11, which connects the two crankshafts with the aid of bevel gear drives 9 in synchronism with the speed. The counter-piston engine is operated with a fuel-air mixture 16 and can be designed for gaseous, liquid and pulverized fuels. The counter-piston engine 12 is operated with excess air, ie with an increased oxygen content than is necessary for the complete combustion of the fuel.

In a counter-piston engine, two pistons 7 each run in opposite directions in one or more cylinder tubes 8, "flushing" slots in the cylinder jacket for sucking in the fuel-air mixture and exhaust slots for blowing out the exhaust gas being opened or closed per revolution by the movement of the pistons. The pistons are connected to crankshafts 15 via crank arms 17. The two outer crankshafts 15 run at a synchronous speed, the respective top dead centers OT of the two pistons working against one another being offset in terms of angle, ie the crankshaft of the leading piston has a certain angular projection in front of the following piston. The TDC position of the two plunger bases overlaps in this area. If the pistons entered their TDC at the same time, their collision would destroy the pistons and the entire engine. For this reason, the angular position of the crankshafts 15 is coordinated with one another such that for a short angular range, after which the leading piston has passed its TDC, the following piston enters its TDC. For this small angular range, the pistons are largely synchronized, within which the combustion of the fuel mixture from one to the other Piston bottoms introduced troughs formed quasi "closed combustion chamber" and thus provides the basis for the high mechanical efficiency of the counter-piston engine.

In order to increase the efficiency, the angular range of the synchronism is substantially increased in the counter-piston engine according to FIG. 3. By introducing at least one special pair of intermediate gears 13 into the gear 9 that synchronously connects the crankshafts 15, on the one hand, an acceleration and a deceleration of the previously always uniform are twice during a 360 ° rotation

Rotational speed of the crankshaft driving the leading piston reached. However, since the synchronous rotational frequency of both crankshafts must be ensured over 360 ° at the same time, the wheels forming the intermediate wheel pair 13 are designed as oval wheels (eg elliptical), the mean diameter of which corresponds exactly to that of the drive wheel of the second crankshaft. In other words, the scope of engagement of the oval wheel is equal to that of the drive wheel of the second crankshaft, so that after each complete 360 ° rotation, both wheels are again in an identical position to one another. The ratio of the large to the small oval diameter can be adjusted such that the angular range can be preselected in which the piston movements take place synchronously, i.e. with the combustion chamber closed at the same time. The position of the main axes of the oval pair of wheels in relation to the TDC of the leading piston for the desired angular range of the "synchronous phase" of the two pistons must be determined. The choice of the ratio of large to small oval diameter is not arbitrary, because the kinematics of the crankshaft drive and mechanical restrictions impose a corresponding increase in the desired angular range. Fig. 4 shows a preferred embodiment of a counter-piston engine with improved efficiency. The above-described effect of enlarging the angular range, in which both pistons 7 form a closed combustion chamber virtually in synchronism with the closest possible proximity to one another, is achieved by a cam disk 1, 2 mounted in a torsionally rigid manner on the outer shafts 15 with an incorporated groove 3. For this purpose, the stroke movements of the two pistons 7 are controlled by a two-roller system 4 running in the groove 3 via connecting rods 5 guided on the outside. The connecting rod 5, which is guided in the outside in the outer bearing 6 so as to be non-rotatable and centrally connected to the piston 7, prevents the occurrence of transverse forces, or the tilting moment of the piston which cannot be avoided with the conventional connection of piston / connecting rod / crankshaft at the respective reversal point of the piston stroke and thus increases the endurance Stability of the engine.

The two-roller system 4 ensures that the rollers in the groove 3 serving as a guideway basically cover the wall of the groove 3 in each case with the same direction of rotation during compression or Contact the blow-out stroke and therefore not be subject to wear from a single-roller guide that changes its direction of rotation depending on the stroke reversal. This principle also ensures the endurance stability of the engine.

In terms of production technology and with regard to the possibility of designing the phase of the synchronism of the pistons 7 with a quasi-closed combustion chamber in the best possible way in terms of optimizing the achievable mechanical efficiency, this technical solution is even superior to the one described above using an oval gear pair in the gear train , As in the previous embodiment, the two outer shafts 15, which support the cams 1, 2, are synchronously connected to one another, for example via bevel gears 9 and a transverse shaft 11. Due to the high mechanical efficiency of the counter-piston engine used, the small-scale fuel power plant described in detail above enables the system to be operated in an extremely variable, power-oriented manner, which, when the small-scale fuel power plant according to the invention is integrated into a network control, brings considerable advantages for the person responsible for supply.

Claims

PATENT TO SPEECH

1. Small fuel power plant (10) comprising an internal combustion engine (12) which emits an exhaust gas (18) generated during combustion, the internal combustion engine (12) having a mechanical efficiency of at least 50%, at least one with the internal combustion engine (12) coupled generator (20, 22) for power generation, at least one active heat exchanger (26), by means of which heat can be extracted from the exhaust gas, and which has at least one heating device.

2. Small fuel power plant according to claim 1, wherein the internal combustion engine is a counter-piston engine (12).

3. Small fuel power plant according to claim 2, wherein the counter-piston engine (12) has one or generators, each of which is individually coupled to one of the two crankshafts.

4. Small fuel power plant according to one of the preceding claims, wherein the internal combustion engine (12) is designed for operation with gaseous or liquid or powdered fuels.

5. Small fuel power plant according to one of the preceding claims, wherein a second heat exchanger is integrated in a cooling circuit of the internal combustion engine.

6. Small fuel power plant according to one of the preceding claims, wherein the active heat exchanger (26) generates heat / steam and is integrated in a buffer memory.

7. Small fuel power plant according to one of the preceding claims, wherein the heating device of the active heat exchanger (26) is a combustion chamber through which the exhaust gas flows and in which fuel for combustion can be supplied to increase the output for heat and steam generation.

8. Small fuel power plant according to one of the preceding claims, wherein the small fuel power plant delivers an electrical power of 10kW to 200kW.

9. Small fuel power plant according to one of the preceding claims, wherein the small fuel power plant comprises a by-pass line which leads the exhaust gas past the active heat exchanger (26).

10. Small fuel power plant according to one of the preceding claims, wherein the small fuel power plant comprises a control device that controls the performance of the internal combustion engine depending on the power requirement.

11. Small fuel power plant according to claim 9, wherein the control device controls the flow of the exhaust gas and the operation of the heating device depending on the heat requirement.

12. Use of one or more of the small fuel power plants (10a, 10b, ... lOn) according to one of the preceding claims in a composite system.

13. Use according to claim 12, wherein the composite system has power-supplying devices (44, 46, 10a, 10b, ... lOn) and power-consuming systems (40a, 40b, ... 40n), and a central control system (48) has, based on the electricity demand of the electricity consuming devices (40a, 40b, ... 40n) in the supply area, taking into account more specific Parameters of the electricity supplying devices control the performance of these individually in order to cover the electricity demand.

14. Use according to claim 12 or 13, wherein the small fuel power plants are used to cover peak loads.

15. Use according to claim 13, wherein the specific parameters of the electricity supplying devices are technical and economic control data.

16. Use according to any one of claims 12 to 15, wherein the composite system is an in-house composite system; especially for process heat / steam with different temperatures, pressures and heat outputs.

17. Use according to one of claims 12 to 15, wherein the network system is a regional network system.

18. Use according to claim 16, wherein the network system is part of a national network system.

19. Counter-piston engine, in particular for a small fuel power plant according to one of claims 1 to 11, characterized in that the two speed-synchronously operated crankshafts (15) are coupled to one another in such a way that at least one crankshaft deliberately deviates from a uniform rotary movement at a constant rotational frequency.

20. Counter-piston engine according to claim 19, characterized in that the two crankshafts (15) are coupled to one another via a gear (9) that is designed such that the crankshaft of the leading piston during a Rotation through 360 ° is accelerated and decelerated twice.

21. Counter-piston engine according to claim 19 or claim 20, characterized in that the transmission (9) has at least one oval (e.g. elliptical) intermediate gear pair (13).

22. Counter-piston engine according to claim 19, characterized in that on both crankshafts (15) cam disks (1, 2) are rotatably mounted, which control the movement of connecting rods (5).

23. Counter-piston engine according to claim 22, further comprising a two-roller system (4), which is respectively mounted on the connecting rods (5) and is arranged in a groove (3) of the cams (1, 2).