DE102005037384A1 - Internal combustion engine with at least two cylinders has first coolant channel connected to second coolant channel in bridge region between cylinders by at least one bore so as to pass coolant - Google Patents

Abstract

The internal combustion engine has at least two cylinders with inlet (3) and exhaust (4) sides and a bridge region (5) between the cylinders (2,2'), whereby a cylinder head or crankcase has coolant channels on the inlet and exhaust sides essentially parallel to the longitudinal axis of the engine. The first channel is connected to the second in the bridge region by at least one bore so as to pass coolant.

Description

The The invention relates to an internal combustion engine having at least two cylinders with the features of the preamble of claim 1.

• – das Kühlmittel wird an in das Zylinder-Kurbelgehäuse eingesetzte Zylinderlaufbüchsen vorbeigeführt und strömt aus einem ersten Kühlmittelkanal, einem Zuführungskanal, in einen zweiten Kühlmittelkanal, einem Austrittskanal;
• – der Zuführkanal und der Austrittskanal sind in die Brennkraftmaschine vorzugsweise an ihren Längsseiten, d. h. parallel zur Brennkraftmaschinenlängsachse, integriert und werden durch Ausnehmungen im Zylinderkopf und im Zylinder-Kurbelgehäuse gebildet;
• – die Ausnehmungen sind von einer Verbindungsebene zwischen dem Zylinderkopf und dem Zylinderkurbelgehäuse aus eingebracht.

It is based on the German patent specification DE 36 03 674 out. In this a multi-cylinder internal combustion engine with liquid cooling, a cylinder head and a cylinder associated with the latter crankcase, the cooling medium flows around cylinder is described. The cooling medium for the individual cylinders is thereby guided predominantly transversely to the longitudinal direction of the internal combustion engine through the cylinder head. Further, the multi-cylinder internal combustion engine is characterized by the following features:

• - The coolant is passed to inserted into the cylinder crankcase cylinder liners and flows from a first coolant channel, a supply channel, in a second coolant channel, an outlet channel;
• - The supply channel and the outlet channel are in the internal combustion engine preferably on their longitudinal sides, ie parallel to the engine longitudinal axis, integrated and formed by recesses in the cylinder head and in the cylinder crankcase;
• - The recesses are introduced from a connecting plane between the cylinder head and the cylinder crankcase.

The Cylinder liners of said internal combustion engine are of coolant flows around it are so-called wet cylinder liners.

adversely in the known embodiment is a very production-intensive Manufacture of the internal combustion engine to cool the cylinder liners.

task The present invention is a manufacturing technology simple possibility to show how hot Web area between the cylinders of an internal combustion engine efficiently be cooled can.

These The object is achieved by the Feature in the characterizing part of patent claim 1 achieved in that the first coolant channel in the web area by at least one bore with the second coolant channel Coolant leading connected is.

There the hottest Area of the land area arranged in the upper third of the cylinder It can, with at least a simple bore, be the inlet side and connecting the outlet side coolant channel, in a simple way the hot one Bridge area cooled become. This can in the simplest embodiment by a single Connecting bore between the inlet and the outlet coolant jacket in the crankcase happen. In a second embodiment For example, the land area of the crankcase may be on the intake passage side and exhaust passage side each have a bore which with each other and with the inlet side and the outlet side coolant passage in the cylinder head connected coolant leading are. In both embodiments, a cross-flow in Ridge area achieved, which cools this in a simple manner.

Around to easily adjust the bore to the geometry of this bridge can the hole according to claim 2 also be conical or designed as a stepped bore. The smallest Hole cross-section is preferably in the thinnest land area.

The holes according to the invention can according to claim 3 either by mechanical processing, d. H. for example Drilling or by pouring be made. Both manufacturing processes are extremely cost effective and also in a mass production used.

Preferably have the holes according to claim 4 a diameter between 0.5 and 5 mm. Of course you can in the case of a stepped bore or a conical bore, the smallest Bore diameter 0.5 mm and the largest bore diameter 5 mm be. This diameter range provides sufficient coolant flow rate, without weakening the bridge itself too much.

According to claim 5 is the hole with mounted cylinder head gasket next to the Sealing area of the cylinder head gasket arranged. Preferably the hole completely enclosed by the sealing area. This ensures that during operation of the internal combustion engine no coolant in the cylinder of the Internal combustion engine can penetrate.

in the The invention is based on three figures for three embodiments explained in more detail:

1 shows a plan view of a portion of a cylinder head gasket in the land area between two cylinders of an internal combustion engine;

2 schematically shows a section through the land area of an internal combustion engine for a first and a second embodiment;

3 schematically shows the same section as 2 for a third embodiment.

1 shows a plan view of a portion of a cylinder head gasket 11 with a sealing area 12 in the dock area 5 between a first cylinder 2 and a second cylinder 2 ' , The sealing area 12 In the present exemplary embodiment, this is a polymer bead applied to a carrier material, which in a further exemplary embodiment can also be represented, for example, by a metal bead. An internal combustion engine longitudinal axis extending perpendicular to not shown cylinder longitudinal axes, is with 1' designated. Opposite to the longitudinal axis 1' There is an inlet side 3 and an outlet side 4 one in 1 not shown internal combustion engine 1 , The sealing area 12 is on both sides of the longitudinal axis 1' forked in a Y-shape, with each branch of a fork forming a cylinder 2 . 2 ' encloses. Outside the sealing area 12 is on the inlet and outlet side each a through hole 14 . 14 ' arranged. The through hole 14 corresponds to a in 2 illustrated cylinder head 6 to a first, on the inlet side arranged coolant channel 8th , the through hole 14 ' corresponds to a second, exhaust side in the cylinder head 6 arranged coolant channel 9 ,

2 schematically shows a section through the web area 5 the internal combustion engine 1 , consisting of the cylinder head 6 , the cylinder head gasket 11 and a crankcase 7 , where the components 6 . 7 . 11 not shown braced on block. For the same components as in 1 the same reference numbers apply. The cylinder head gasket 11 between the cylinder head 6 and the crankcase 7 is arranged, is longitudinal to the through holes 14 . 14 ' cut. Corresponding to the through holes 14 . 14 ' is in the cylinder head 6 the first coolant channel 8th and the second coolant channel 9 shown in cross-section. Geodetic under the through holes 14 . 14 ' are according to a first embodiment, the first and the second coolant channel 8th . 9 over two holes 10 . 10 ' Coolant leading together. In the present embodiment, the holes 10 . 10 ' Stepped holes whose cross-section tapers in the direction of their point of intersection. Under a hole 10 . 10 ' is understood a connection opening with a substantially circular cross-section.

During operation of the internal combustion engine 1 is a coolant from the first coolant channel 8th in the cylinder head 6 through the holes 10 . 10 ' in the crankcase 7 in the second coolant channel 9 in the cylinder head 6 promoted. The direction of flow is indicated by two arrows. This heat is very efficient from the web area 5 dissipated, allowing overheating of the land area 5 is safely avoided. Of course, an inverted flow direction is possible for all embodiments.

In a second embodiment in 2 has the crankcase 7 also on the inlet side, a first coolant channel 8th' and a second coolant channel on the outlet side 9 ' on. As in the first embodiment, the first and the second coolant channel extend 8th' . 9 ' largely in the direction of the longitudinal axis 1' , The first and second coolant channels 8th' . 9 ' are over a hole 10 Coolant leading together. As already described for the first exemplary embodiment, during operation of the internal combustion engine 1 Coolant through the hole 10 from the first coolant channel 8th' in the second coolant channel 9 ' promoted, reducing the bridge area 5 is efficiently cooled in a simple manner. The flow direction is again indicated by an arrow. So that during operation of the internal combustion engine 1 no coolant from the crankcase 7 can exit is the hole 10 on an outer wall of the crankcase 7 with a closure element 13 locked.

In 3 is for a same schematic cut as in 2 a third embodiment of an internal combustion engine according to the invention 1 shown. As in 2 also apply in 3 for the same components the same reference numerals as in the 1 and 2 , In contrast to the first embodiment are in 3 the stepped holes 10 . 10 ' through conical holes 10 . 10 ' substituted. Operation principle and manner are identical to the first embodiment.

The holes 10 . 10 ' can - as shown above - be formed as normal holes, ie cylindrical holes or conical or stepped bore. The production of the holes 10 . 10 ' is done either by mechanical processing or by casting over cores during the casting process in the manufacture of the crankcase 7 , Both methods are very cost effective and applicable in mass production. So the bridge 5 can be sufficiently cooled, the minimum bore diameter is 0.5 mm and the maximum bore diameter 5 mm. As already under 1 shown, are the through holes 14 . 14 ' the cylinder head gasket 11 outside the sealing area 12 the cylinder head gasket 11 , so that during operation of the internal combustion engine 1 no coolant in the cylinders 2 . 2 ' can occur.

The holes 10 . 10 ' can be set according to the invention near the (hot) bridge center and are therefore for the cooling of the web 5 effective. Nevertheless, tightness problems are avoided and the production is very simple. The embodiment of the invention advantageously allows a higher engine performance with a small cylinder spacing, resulting in a significant package advantage.

1

Internal combustion engine

1'

longitudinal axis

2, 2 '

cylinder

3

inlet side

4

outlet

5

web region

6

cylinder head

7

crankcase

8th, 8th'

first Coolant channel

9 9 '

second Coolant channel

10 10 '

drilling

11

Cylinder head gasket

12

sealing area

13

closure element

14 14 '

Through Hole

Claims (5)

Internal combustion engine ( 1 ) with at least two cylinders ( 2 . 2 ' ) with an inlet ( 3 ) and an outlet side ( 4 ), as well as a land area ( 5 ) between the cylinders ( 2 . 2 ' ), wherein a cylinder head ( 6 ) or a crankcase ( 7 ) of the internal combustion engine ( 1 ) on the inlet side a first ( 8th . 8th' ) and on the outlet side a second ( 9 . 9 ' ), substantially parallel to a longitudinal axis ( 1' ) of the internal combustion engine ( 1 ) arranged coolant channel, characterized in that the first coolant channel ( 8th . 8th' ) in the land area ( 5 ) by at least one bore ( 10 . 10 ' ) with the second coolant channel ( 9 . 9 ' ) is connected coolant-carrying. Internal combustion engine according to claim 1, characterized in that at least one bore ( 10 . 10 ' ) is conical or designed as a stepped bore. Internal combustion engine according to claim 1 or 2, characterized in that the bore ( 10 . 10 ' ) is made by mechanical machining or by encapsulation. Internal combustion engine according to one of the claims 1 to 3, characterized in that the bore ( 10 . 10 ' ) has a diameter between 0.5 and 5 mm. Internal combustion engine according to one of claims 1 to 4, wherein the internal combustion engine is a cylinder head gasket ( 11 ) with at least one sealing area ( 12 ), characterized in that the bore ( 10 . 10 ' ) with mounted cylinder head gasket ( 11 ) next to the sealing area ( 12 ) is arranged.