DE2415796A1 - AIR-COOLED PISTON ENGINE - Google Patents

Description

2415798

Klöckner-Humboldt-DeutzAG AKKD 5 _{K (jln} qq _{f March 12,} 1974

Our reference: D 74/8 - APTA So / Bu

Air-cooled reciprocating internal combustion engine

The invention relates to an air-cooled reciprocating internal combustion engine with upright rib cylinders, using the same main machine parts, e.g. the crankcase in a machine other design is convertible.

In engine construction, the production of large series requires special machines that are assembled into production lines and are only suitable for the efficient production of the same workpiece (so-called Transfer lines). This results in high investment costs, which at the same time have little or no changes of the workpiece, otherwise the costs for necessary modifications to the production line will be too high or even their renewal would be necessary.

For these reasons, the workpieces must About economically justifiable quantities

509842/0184

KIöckner-Humboldt-Deutz AG // Λ I% K ^ J

2 March 12, 1974

D 74/8

and thus remain the same over longer periods of time. In order to still produce variants of a product To be able to, attempts are made to design individual workpieces from the outset so that they can later be used for different ones Versions of the same product can be used.

It is known in an air-cooled reciprocating internal combustion engine (Automobiltechnisches Handbuch, Bussin, Verlag H. Cram, Berlin 1965, page 707) to design the crankcase in such a way that the machine can be replaced by replacing the Rippei \ cylinders with water-cooled individual cylinders and adding various other parts a water-cooled version can be converted. The crankcase and other main parts can continue to be used here. It is disadvantageous in such designs that allow a possibility of variation that both designs do not represent an optimal solution, because the possibility of variation requires compromises. In the known motor, for example, there is a very large gap and thus

509842/0184

Akhd

Klöckner-Humboldt-Deutz AG 2 / ArVFfllLF _ 3 - March 12, 1974

D 74/8

a larger overall length, which is smaller in comparable other water-cooled machines.

The invention is based on the object of reducing the overall height of an air-cooled internal combustion engine, without noticeably reducing the performance or the cooling surface.

In an internal combustion engine of the type mentioned at the outset, this is achieved in that, when used a shorter piston stroke and the use of the same crankcase, the support surface of the ribbed cylinder above the piston rings - at the bottom dead center position of the piston - and that the ribbed cylinder is in the Area of the cylinder base and its part surrounded by the crankcase from a highly thermally conductive Material is encased and / or is additionally cooled by a liquid coolant.

Here, complex parts such as the crankcase or the cylinder head can be taken over unchanged from the long-stroke machine design. Of the

509842/0184

Klöckner-Humboldt-Deutz AG Ζ / ΆΪ% .Π1 ^ _ 4 - March 12, 1974

D 74/8

the low cylinder resulting from the reduced piston stroke enables a lower overall height the machine and at the same time allows a higher speed with the same mean piston speed to. As a result, the performance remains the same despite the smaller construction volume. The one that protrudes deep into the crankcase lower part of the finned cylinder gives its drive heat to the very thick casing from a Aluminum alloy. The heat can escape from the jacket over sufficiently large cross-sections in the upper, the part of the finned cylinder exposed to the cooling air.

Effective heat dissipation also results from that the lower part of the finned cylinder is cooled by a liquid coolant, after a Another idea of the invention is the liquid cooling in the lower part of the rib cylinder by the The machine's lubricating oil circuit takes place.

In order to achieve a favorable heat dissipation from the area of the piston crown, after a further process

509842/0184

Klöckner-Humboldt-DeutzAG ζλ \ λ ■ me ■■ »_“. , " _N " i

- 5 - March 12, 197h

D 74/8

Thanks to the invention, it is proposed that the sheathing be made of a material with good heat conductivity and / or liquid cooling of the lower part of the rib cylinder protruding into the crankcase extends to in extends the area of the piston rings at the bottom dead center position of the piston.

For reasons of simpler manufacture and avoidance of temperature differences between the ribbed Part of the cylinder and the lower part of the cylinder is proposed that the ribbed upper part of the cylinder is made of a material that conducts heat well, which, with the protruding into the crankcase Cylinder jacket part forms one piece. This makes it possible to use the outer, highly thermally conductive cylinder part e.g. using the AIfin process around a cylinder barrel to cast from centrifugal casting. Another, expedient version results when the highly thermally conductive Sheath cast or shrunk only around the lower part of a cylinder from centrifugal casting is.

5098A2 / 0184

A KHD

flöckner-Humboldt-DeutzAG ϋ $ ΛΪ% ΠΒ ^ _ 6 - 12.3 · 1974

D 74/8

In the drawing are exemplary embodiments of the invention shown schematically.

Figs. 1 to 3 each show the upper part of a crankcase with different ribbed cylinders in longitudinal section through the cylinder.

In Fig. 1, the upper part of a crankcase 1 with attached rib cylinder 2 is in longitudinal section shown. In contrast to designs of conventional air-cooled machines, the rib cylinder 2 protrudes much deeper into the crankcase 1. This peculiarity results from the use of a Crankcase of normal design for a machine with a shorter piston stroke. The shorter piston stroke requires a shorter rib cylinder, which at the same time protrudes deeper into the crankcase. When using a crankcase, which was originally designed for a longer piston stroke, there is thus the need to to particularly cool the ribbed cylinder in its lower area, because there are none here for reasons of space Cooling fins can be provided.

509842/0184

Klöckner-Humboldt-Deutz AG ACil% HiD - 7 - 12.3 · 1974

D 74/8

The rib cylinder 2 is sealed against the crankcase 1 by the seal 3. With a foot flange 4, which is at the same time part of a tubular lower cylinder part 5 surrounding the ribbed cylinder 2, the ribbed cylinder 2 stands on the crankcase 1 · The tubular lower cylinder part 5 '"· is shrunk onto the ribbed ^{cylinder made of a material 1 with good thermal conductivity} Compounds such as composite casting can also be used to achieve good heat transfer. The length of the lower cylinder part 5 extends into the area of the piston rings 6 at the bottom dead center position of the piston 7. orgifet. a high heat gradient to the lower cylinder part 5 and thus effective cooling. The cooling effect is further increased by the fact that the upper end of the lower cylinder part 5 protrudes into the area of the rib cylinder 2 around which the cooling air flows and is additionally equipped with ribs. The ample wall thickness of the un direct cylinder part 5 ensures good heat absorption and

509842/0184

Klöckner-Humboldt-DeutzAG ZAüima mwmm ^ "^ 1? ^ 1Q74

D 74/8

unhindered flow of heat into the upper cooled Part of the cylinder 2. Another favorable design of the lower cylinder part 5 results due to the one-piece connection with the pipe connection part 8 for the bumper protection tubes 9. The latter are because of the lubricating oil delivery from the upper spaces of a cylinder head not shown in detail held with a plug connection sealingly in a receiving bore.

This special design of the rib cylinder, it is possible in an advantageous manner, the crankcase 1 to use an air-cooled long-stroke internal combustion engine for a short-stroke machine. The reduction in the stroke volume due to the shorter stroke can be achieved by controlling the speed up to the middle one Piston speed of the long-stroke machine can be compensated again, so that with smaller The overall volume of the machine results in approximately the same performance.

In Fig. 2, the upper part of a crankcase 1 with attached rib cylinder 2 is shown in section.

509842/0184

Klöckner-Humboldt-DeutzAG ACii ^ HIO

D 74/8

represents. The rib cylinder 2 protrudes very deeply into the crankcase 1, similar to that in FIG. 1}. This makes it possible to convert a long-stroke machine into one using as many main parts as possible to convert short-stroke machine. The rib cylinder 2 is at its lower end against the crankcase sealed by the seal 3. Above this seal is from the cylinder outer wall 10 and the enlarged receiving bore 11 for the cylinder in the crankcase 1, an annular space 12 is formed through the cylinder base flange 4 is sealed on the crankcase 1, d. The annular space 12 is through the bore via the throttle point 16 to the main lubricating oil channel 14 connected to the machine * The overflow from the annular space 12, which is used to cool the lower one, is not ribbed Part of the cylinder 2 is used, takes place via the bore 15 in the crankcase 1. The annular space 12 is chosen in its axial extent so that it extends into the area of the piston rings 6 at bottom dead center of the piston 7 protrudes. This results in a very effective one for the lower part of the cylinder 2 Liquid cooling. This cooling is used in

Akhd

KlQckner-Humboldt-DeutzAG uvum "_ -_-, -_ .." - "..-" ι

10 March 12, 1974

D 74/8

partly achieved by the connection to the lubricating oil ^{circuit of the machine, so that e} Sis on the inlet and outlet bores 13 and 15 does not require any additional effort for additional cooling.

In Fig. 3 , the upper part of a crankcase 1 with attached rib cylinder 2 is shown in longitudinal section. The ribbed cylinder 2 protrudes very deeply into the crankcase 1, similar to that in FIGS. 1 and 2. This makes it possible to convert a long-stroke machine into a short-stroke machine using as many main parts as possible, for example the crankcase.

The ribbed cylinder 2 is sealed off from the crankcase by the seal 3 at its lower end 2. The ribs consist of a metal that conducts heat well, "e.g. an aluminum alloy, which is connected to the cylinder tube 13 made of centrifugal casting according to the AIfin process by casting. The cooling fins go into the cylinder base at the level of the crankcase

509842/0184

Klöckner-Humboldt-Deutz AG ^> Λ Ι \ Π l # _ ^ ^ _ March 12, 1974

D 74/8

flange 4 with which the ribbed cylinder 2 stands on the crankcase 1. The sheathing of the cylinder tube 17 with the material that conducts heat well continues below the cylinder base flange 4. It protrudes into the crankcase 1 as a thick-walled, tubular lower cylinder part 5. This casing ends in the area of the piston rings 6 at the bottom dead center position of the piston. This results in particularly good heat dissipation from an area with a high operating temperature. The connection of the thick-walled lower cylinder part with the ribbed cylinder part 2 results in good heat dissipation into the part of the cylinder 2 exposed to the cooling air _. so that no significant temperature difference can arise between the upper and lower part 5 of the rib cylinder due to the different design of the outer cylinder wall.

In this cylinder design, too, the pipe connection part 8 for the bumper protection pipes 9 is in one piece connected to the rib cylinder 2, so that the seal of the pipe can be relocated in this part can.

SÖ9842 / 0184

Claims (3)

Kiöckner + fumboidt-Deutz ag ZA HLM S3 5 Cologne 80, March 12, 1974 Our reference: D 74/8 - APTA So / Bu patent claims 1. J Air-cooled reciprocating internal combustion engine with vertical rib cylinders, which can be converted into a machine of a different design using the same main machine parts, e.g. the crankcase, characterized in that when a shorter piston stroke is used and the same crankcase (1) is used, the bearing surface of the rib cylinder (2) above the first piston rings (6) is in the bottom dead center position and that the ribbed cylinder in the area of the cylinder base (4) and its part (5) surrounded by the crankcase is encased by a highly thermally conductive material and / or is additionally cooled by a liquid coolant. 2. Air-cooled reciprocating internal combustion engine according to claim 1, characterized in that the casing and / or liquid cooling of the lower part (5) of the ribbed cylinder (2) protruding into the crankcase extends into the area of the piston rings (6) at the bottom dead center position of the piston (7). 509842/0184 Akhd Klöckner-Humboldt-Deutz AG Ζ / να I «! ■ mmm _- ^ a _ 12.3.1974 D 74/8 3. Reciprocating internal combustion engine according to one of claims 1 or 2, characterized in that the The ribbed upper part of the cylinder (2) consists of a material that conducts heat well, which is connected to the Crankcase (1) protruding cylinder jacket part forms one piece. 4 «Air-cooled reciprocating internal combustion engine according to Claims 1 to 3, characterized in that the liquid cooling is in the lower part (5) of the ribbed cylinder (2) takes place through the machine's lubricating oil circuit. 509842/0184 Blank page