DE2509075A1 - Two-stroke IC engine - with two working cylinders, 180 degree out of phase - Google Patents

Abstract

the engine has at least two working cylinders (2, 3), acting 180 deg. out of phase. On the side of the crank, the bore of each cylinder (2, 3), has a stepped widened section (4) and pistons (7, 8) of corresponding shape. this piston surface (9) away from the crank housing (11) has an additional cylinder chamber (5, 6). The chamber is in flow connection with the ignition chamber of the opposing cylinder. The piston have piston sealing rings (23) on the side towards the crak. The widened section of each cylinder has an inlet valve, acting as a back pressure valve. The crank housing forms a sump for the lubricating oil, and the crank (10) is utilized for central lubrication.

Description

Dip! - Ing.

ν ■ '.. --lic;

Andre Runser, Jasel (Switzerland)

Bremil lraft engine working in two-stroke cycle.

The invention relates to a two-stroke engine Combustion machine of new construction with a the same work caused by it swirling.

In the case of internal combustion engines working in the two-stroke cycle, esp. Such gasoline "otoren, as is well known, has the ϊίοtorylinder in its landing at a suitable place openings that so-called slots, which occur when going back and forth in this Cylinder running ivolbens through this piston in its appropriate position partly for the supply of the Cylinder with the fuel-air mixture and other parts to be released for exhausting the burned exhaust gases at the correct working time.

A distinction is made here between that flushed by a fan and that flushed using the crankcase housing flushed two-stroke. In the former, the cylinder gets the fuel-air mixture through its Inlet slots fed from a special fan; the crankcase is known to be found in the latter together with the crank gear as a fan

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Use for feeding the cylinder through a so-called. Overflow slot through.

Any of these well-known ways of working the two-stroke engine has its drawbacks. In the first pail, as I said, a fan is also required. i3 flushed with the crankcase Two-stroke engines must have the fuel-air mixture a certain amount of 01 added for lubrication '.-,' ground, xvas has disadvantages of various kinds.

The two talc machine corresponding to the invention, at which draws the identified disadvantages of the well-known two-stroke purpose «; e: staying wet mainly avoided invention is characterized by the fact that they are at least has two working cylinders working in push-pull, the bore of which on the crank gear side each has at least one step-shaped extension has one in each Cylinders running, their shape adapted piston, the so expanded in front of its from the crankcase repelling Front face a further cylinder working space is given, this expanded cylinder space with is connected so that it can be fed to the working chamber of the counter cylinder provided for the ignition.

In the sense of the invention, the piston of each stepped cylinder is also in the area of its crank gear side Extension equipped with sealing piston rings or the like. This is in the same cylinder each time a second, new, piston-actuated working area was created.

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The following is the invention and its details and explained in more detail with reference to drawings in an exemplary embodiment shown schematically described. Show it:

Pig. 1 shows a two-stroke engine according to the invention in a central longitudinal section through its two cylinders and

Pig. 2 shows a longitudinal section along the section line II-II in Fig. 1.

The unitary engine block 1 has two bores 2 and 3> serving as cylinders suitably enlarged by a step 4 in their diameter are expanded to the larger cylinder chambers 5 and 6, The appropriately designed pistons 7 and 8 run in the cylinders shaped in this way Widening 9 have a kind of T-porm. The crank mechanism 10 of both pistons 7 and 8 sits on the common, in Crankcase 11 bearing ¥ elle 12. 13 and 14 are the connecting rods that lead to the pistons and, as is known, are articulated with them. With 15 designated cylinder opening serves as an exhaust.

The expanded cylinder spaces 5 and 6 are each by one Connection channel 16 or 17 with the inlet slots 18 of the counter cylinder connected. For supplying the gas-air mixture From the carburetor, both cylinders each have a connection opening 19. In this there is a Check valve 20, which prevents the mixture from entering the feed line during precompression

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can. The opening in the cylinder wall for admitting the pre-compression part mixture is designated by 21 in each case. 22 are the openings for screwing in the spark plugs. The piston 7 ^UIi -d 8 have the rings 23 for sealing and lubrication on both the ignition and the crank gear side. The crankcase 11 contains lubricating oil. 2k is the pull-out measuring stick.

The following can be said about the mode of operation of the double-cylinder two-stroke engine described:

¥ ie from the drawings and the position of the jüolben 7 and 8 shown, they work in push-pull. The left piston 7 is in the position shown at the time of ignition. After the ignition has taken place, it executes its downward working stroke that drives the engine. The burnt gases relaxing in the process can then leave the upper cylinder space as soon as the front face of the piston has released the outlet opening 15 of the cylinder (see position of the right piston 8). This piston 8 has meanwhile gone up into the compression position and has previously pushed the gas-air mixture that was precompressed in its cylinder space 6 into cylinder 2 through the transfer channel 1 ^ and at the same time helped to flush out the burnt gas in this cylinder jMBMltSänBttSlB &. Of course, for this purpose the outlet 15 on the cylinders can also be provided at a slightly higher level than it corresponds to the inlet slots 18. As a result, the latter slots 18 only become somewhat in terms of time

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later fr. given as the A ^ 1st puff opening. This can be the Improve the way the engine works.

Pur the piston 8 repeat itself as soon as it reaches its compression position for the ignition has achieved the processes as just described for the piston 7 are.

During the working cycle of each piston, fresh mixture is fed into the expanding cylinder chamber 5 or 6 sucked in through the respective associated opening 21. This mixture is then, as described above, pressed into the counter cylinder. So every cylinder of the new engine works in the second work cycle at the same time as a charging fan.

The crank mechanism also creates a kind of central lubrication by means of the oil in its box for the engine or its piston rings. This can lead to the piston rings from the inside fine Find holes suitable for use (not shown). However, the gas-air mixture fed to the cylinders remains without the addition of lubricating oil, so that the disadvantages caused by this are basically avoided.

It should also be mentioned that the engine with its two Cylinders of the new design are expediently designed as a unit that is closed in itself to form a structural unit is. A plurality of such double cylinder units can also be combined to form a unit be. The port step achieved by the invention is thus given, among other things, in the creation of an oil-free mixture,

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i.e. able to work with regular gasoline with savings in oil Two-stroke with the saving of a special flushing fan. This engine is also more environmentally friendly, because no burned oil is expelled in the exhaust or no unburned oil, what so-called blue haze leads to a particular odor nuisance for the environment can be.

It should also be mentioned that the motor corresponding to the invention, under otherwise identical conditions, also has a higher charging options with fuel or fuel-air mixture allows for compression. This also allows a higher performance with otherwise the same Achieve engine effort. This results in further advantages in terms of a smaller construction option for the Motor that can be made so more compact. There is also no need for a special charge pump. Suitable in a small version The new two-stroke engine is particularly suitable for driving water sports vehicles, because it doesn’t get through the exhaust fumes There is more water pollution than before with the two-stroke engine.

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Claims (1)

Claims M.) Internal combustion engine working in two-stroke, characterized in that it has at least two working cylinders (2, 3) working in push-pull, the bore of which on the crankshaft side has at least one step-like enlargement (5> 6) with one in each of these cylinders (2, 3) ) running, their shape adapted piston ("7, 8), which is given a further cylinder working space (5> 6) in front of its expanded end face (9) facing away from the crankcase (ii), this expanded cylinder space with the one provided for the ignition Working space of the opposing cylinder is connected so that it can be fed. 2. Internal combustion engine according to claim 1, characterized in that that the piston (7, 8) of each stepped cylinder (2, 5 or 3 »6) also in the area of its cam gear side Extension with sealing piston rings (23) or the like. Is provided. 3. Internal combustion engine according to claim 1 and 2, characterized in that an inlet valve designed as a check valve (20) is provided in the area of the extension {k) of each cylinder (2, 5 or 3 »6). k. ■ Internal combustion engine according to claim 1 and 2, characterized in that the crank gear housing (11) can be used as a trough for absorbing lubricating oil while achieving central lubrication by means of the crank gear (10). 609836/0223 5. Internal combustion engine according to claim 1 or one of the Claims following it, characterized in that the engine with its two cylinders (2, 5 or 31 6) is designed as a unit (i) which is enclosed in itself to form a unit. 6. Internal combustion engine according to claim 5 »characterized in that a plurality of double cylinder units is provided combined into one unit. / 0? 23