EP1664513B1 - Device for guiding media in a cylinder block and crankcase - Google Patents

Description

The invention relates to a device for media guidance in a cylinder crankcase of a reciprocating piston engine with multiple cylinders, according to the preamble of claim 1.

Cross channels of the generic type are known in cylinder housings of internal combustion engines both for lubricating oil supply and as cooling water ducts for the cooling system in a variety of designs (see, for example DE 43 41 040 A1 . US4850312 or DE 36 01 383 A1 ). Due to the limited space, the thinnest possible wall thicknesses of the cylinder housing and / or by adjacent functional parts, these transverse channels are usually complicated in their geometry and restricted in the flow area.

The object of the invention is to provide a device of the generic type, which can be produced with a simple ducting and sufficiently sized flow area even in confined space.

This object is achieved with the characterizing features of claim 1. Advantageous developments of the invention include the further claims.

According to the invention, it is proposed that the at least one transverse channel runs in a free space that passes through recesses of two adjoining pistons in the lower region of the piston shanks and above the crankshaft bearing the internal combustion engine is formed. Thus, the transverse channel can be made with a larger diameter than the distance of the cylinder to each other (interstice spacing), whereby the number of transverse channels can be reduced and / or the flow rate can be increased. In addition, there is a simplified ducting, possibly without required flow diversions.

Preferably, the transverse channel can serve for cooling water flow between two-sided cooling chambers of the internal combustion engine, although appropriate transverse channels for lubricating oil supply of the internal combustion engine can be provided alternatively or additionally.

Production technology particularly simple cross channel can be formed by a tube inserted into a transverse bore of the cylinder housing. In addition to the simplified channel guide and castability of the cylinder crankcase, the machining of the cylinder surfaces (drilling, honing) is simplified by the transverse channel forming tube is used only after the finishing of the cylinder liners or the entire cylinder crankcase and therefore does not hinder the previous processing steps.

Furthermore, it is proposed that in an internal combustion engine with ventilation openings provided between the cylinder bores in the cylinder crankcase transverse walls, the pipe traverses the ventilation openings. Thus, the preferably thin-walled tube bridges these ventilation openings and allows an even more crowded arrangement of the transverse channel.

The transverse channel can preferably be connected on the one hand via a feed directly to the water pump of the internal combustion engine and thus effectively provide the water pump facing away from the longitudinal side of the series internal combustion engine with cooling water.

Furthermore, the at least one transverse channel can extend above a longitudinal channel, arranged in the cylinder crankcase, of the pressure circulation lubricating system of the internal combustion engine and thus reduce the manufacturing outlay while avoiding channel deflections. Both the transverse channel and the said longitudinal channel can be produced by correspondingly rectilinear bores.

Particularly advantageously, furthermore, the transverse channel in an internal combustion engine with two balancing shafts arranged on either side of the cylinder can be made inclined in such a way that it extends below the higher balancing shaft un above the lower second balancing shaft. At the expense of a slight inclination of the transverse channel of the clearance of the balance shafts and the manufacturing technology favorable arrangement whose bearings in the cylinder crankcase is ensured in a simple manner.

Finally, the pistons may be so-called box pistons or slipper pistons whose piston shanks or piston shirts form only side guides of the pistons transversely to the longitudinal axis of the row internal combustion engine through corresponding symmetrical recesses in the region below the piston rings.

An embodiment of the invention is described in more detail below with further details.

• Fig. 1 einen teilweisen Querschnitt gemäß Linie I - I der Fig. 2 durch ein Zylindergehäuse einer Vierzylinder-Reihen-Hubkolben-Brennkraftmaschine mit einem als Rohr ausgeführten Querkanal im Zwickelbereich zwischen zwei benachbarten Zylindern, und
• Fig. 2 einen Längsschnitt gemäß Linie II - II der Fig. 1 durch das abschnittsweise dargestellte Zylindergehäuse.

The accompanying schematic drawing shows in:

• Fig. 1 a partial cross section according to line I - I of Fig. 2 by a cylinder housing of a four-cylinder in-line reciprocating internal combustion engine having a transverse channel designed as a tube in the gusset region between two adjacent cylinders, and
• Fig. 2 a longitudinal section along line II - II of Fig. 1 by the cylinder housing shown in sections.

In the Fig. 1 is denoted by 10 a cylinder housing of a four-cylinder in-line reciprocating internal combustion engine shown in sections, which may not be shown and described known type so far.

In the cylinder housing 10 are cylinder 12 (see. Fig. 2 ) are formed with corresponding running surfaces for pistons 14.

The pistons 14 are drivingly connected in known manner via piston pins and connecting rods, not shown, with a crankshaft of the internal combustion engine.

The crankshaft is rotatably mounted in transverse walls 16 of the cylinder crankcase 10 and in corresponding end walls (not shown), with corresponding storage chairs 18 are incorporated into the transverse walls 16, which (not shown) with screw-on bearing caps, the main crankshaft bearing.

Furthermore, bearing points 20, 22 are provided in the cylinder crankcase 10 on both sides of the crankshaft rotation axis or on the longitudinal sides, in which balancer shafts (not shown) are rotatably mounted to compensate for free mass forces or moments of the second order of the internal combustion engine.

The pistons 14 are designed as so-called box pistons, the piston shaft below the piston rings (without reference numerals) are provided with symmetrical recesses 14 a, so that the piston 14 in its lower region only in the transverse direction (corresponding to the sectional plane of the Fig. 1 ) are guided in the cylinders 12.

The cylinder walls 12a of the cylinder 12 terminate in the relative to the longitudinal direction of the cylinder housing 10 lateral portions of the piston 14, as seen from Fig. 2 can be seen, in the bottom dead center position of the piston 14 due to ventilation openings 26 just below the rotationally symmetric region of the piston 14 with the piston rings, whereby in the gusset area (= merging cylinder walls 12a adjacent cylinder 12) as shown each have a free space 24 is created which is bounded by the recesses 14a of the piston 14 and which also lies above the crankshaft bearing with the bearing block 18.

The cylinder liners thus end in the region of the recesses 14 a of the piston 14 a due to the ventilation openings 26 below the piston rings and in the region of the piston 14 with respect to the transverse direction of the cylinder housing 10 approximately to the lower edge of the piston skirt, so that lateral guides of the piston 14 only transverse to Longitudinal axis of the cylinder housing 10 are formed.

The provided in the transverse walls 16 of the cylinder housing 10 ventilation openings 26 (see. Fig. 1 ) connect the lying between the transverse walls 16 of the cylinder housing 10 crankcase chambers (which are bounded below by the oil pan, not shown) with each other for the purpose of pressure equalization.

In the said space 24, a transverse channel 28 is provided, which is composed of a corresponding bore 30 in the cylinder housing 10 and a thin-walled tube 32, wherein the tube 32 is inserted tightly into the bore 30. This can be done by pressing and / or by inserting appropriate sealing rings.

The tube 32 extends freely carrying through the ventilation opening 26 and is arranged inclined so that it (see. Fig. 1 ) below the higher balancing shaft (bearing 20) and above the lower balancing shaft (bearing 22) extends, with acceptable wall thickness between the said bearings 20, 22 and the bore 30 for the tube 32 are taken into account or provided.

The transverse channel 28 is as in Fig. 1 schematically indicated via a tubular branch 34 directly to the pump housing 36 of the water pump (not shown) of the internal combustion engine connected and supplied on the opposite side of the cylinder housing 10 arranged cooling water spaces (not shown) with cooling liquid. Said pump housing 36 is integrated in the cylinder housing 10.

Below the transverse channel 28, a longitudinal channel 38 is cast into the cylinder housing 10 on one side of the crankshaft axis of rotation, which supplies as part of the pressure circulation lubrication system of the internal combustion engine, inter alia, via branch channels 40, the crankshaft bearing 18 with lubricating oil.

Instead of a transverse channel 28, a plurality of transverse channels can also be arranged in further transverse walls 16 of the cylinder housing 10. The transverse channels 28 may also carry other media, in particular lubricating oil from the lubrication system of the internal combustion engine. The cylinder housing 10 may also be provided in a manner not shown with cylinder liners having the said running surfaces for the piston 14.

Claims (8)

1. A reciprocating piston in-line internal combustion engine with a device for media guidance in an engine block of the reciprocating piston in-line combustion engine with a plurality of cylinders, wherein the media guide has, among other things, at least one transverse duct leading from one longitudinal side to the other longitudinal side of the engine block, characterised in that the transverse duct (28) runs in a free space (24) which is formed by recesses (14a) of two adjacent pistons (14) in the lower region of the piston skirts and above the crankshaft bearings (18) of the internal combustion engine.
2. The internal combustion engine according to Claim 1, characterised in that the transverse duct (28) serves to guide the coolant between the cooling devices of the internal combustion engine on both sides.
3. The internal combustion engine according to Claim 1 or 2, characterised in that the transverse duct (28) is formed by a pipe (32) inserted in the transverse bore (30) of the cylinder housing (10).
4. The internal combustion engine according to one or more of the preceding claims, wherein vents (26) are provided between the cylinder bores (12) in the transverse engine block walls (16), characterised in that the pipe (32) passes through the vents (26).
5. The internal combustion engine according to one or more of Claims 1 to 4, characterised in that the transverse duct (28) is connected on one side by a feed pipe (34) directly to the water pump (36) of the internal combustion engine.
6. The internal combustion engine according to one or more of Claims 1 to 5, characterised in that the transverse duct (28) runs above a longitudinal duct (38) of the forced feed lubricating system of the internal combustion engine, which duct is arranged in the engine block (10).
7. The internal combustion engine according to one or more of Claims 1 to 6, characterised in that the transverse duct (28) is of an inclined construction in an internal combustion engine with two balance shafts arranged on both sides of the cylinders (12) so that the duct, viewed in cross-section, runs below the balance shaft above it and above the balance shaft below it.
8. The internal combustion engine according to one or more of the preceding claims, characterised in that the pistons (14) are so-called box-type pistons or slipper skirt pistons.

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