DE102012200527A1 - Internal combustion engine with at least three cylinders - Google Patents

Abstract

Internal combustion engine with at least three cylinders in series in a crankcase and with a cylinder head with an inlet and an outlet side, and in each case a land area between the cylinders, wherein for the cylinder head and / or the crankcase a first and a second, substantially parallel to a longitudinal axis The coolant channel arranged for the internal combustion engine is provided for a coolant, wherein the first and the second coolant channel are connected by at least one web bore with coolant and wherein the cylinder head is largely transversely and partially longitudinally flowed through by the coolant, wherein a flow cross-section of the first coolant channel becomes smaller in the flow direction of the coolant and a flow cross-section of the second coolant channel in the flow direction of the coolant increases. The inventive design of the internal combustion engine, the cooling of the land area in the crankcase and the roof area of the cylinder head is significantly improved.

Description

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

From the German patent application DE 10 2005 037 384 A1 , from which the present invention proceeds, an internal combustion engine having at least two cylinders is known. The internal combustion engine has an inlet and an outlet side for the charge exchange, as well as a web region between the cylinders. The cylinder head and / or the crankcase of the internal combustion engine have on the inlet side a first and on the outlet side a second coolant channel oriented substantially parallel to a longitudinal axis of the internal combustion engine. The proposed internal combustion engine is characterized in that the first coolant channel in the web region is conductively guided by at least one bore to the second coolant channel coolant.

By the DE 10 2005 037 384 A1 Although it is known how the land area of an internal combustion engine can be cooled particularly well during operation, however, this publication does not disclose how a plurality of cylinders arranged one after another in a row are cooled uniformly along the longitudinal axis of the internal combustion engine, ie with a small temperature difference from land area to land area can.

Object of the present invention is to show a measure, such as an internal combustion engine with at least three cylinders in the direction of its longitudinal axis uniformly, d. H. can be cooled with a low temperature difference from land area to land area.

This object is solved by the features in the characterizing part of patent claim 1. The embodiment according to the invention achieves an extremely uniform temperature distribution along the longitudinal axis of the internal combustion engine from land area to land area. In addition, the roof area of the cylinder head is also cooled very evenly and efficiently. This supports the warm-up of the internal combustion engine and thus leads to an optimized lubricant transfer by excellent heat transfer from the hot zones of the cylinder head in lubricant leading structures of the base engine, whereby the friction power (power loss) is advantageously significantly reduced, which in turn leads to a significant fuel economy during warm-up leads.

The embodiment according to claim 2 has been found in experiments to be particularly advantageous.

With the embodiment according to claim 3, the greatest homogenization of the temperature over the longitudinal axis of the internal combustion engine is achieved.

The embodiment according to claim 4 is a particularly advantageous embodiment.

With the embodiment according to claim 5, the coolant supply can be reduced by the cylinder head or completely turned off during warm-up, which in particular for the warm-up of the engine, as already shown above, is advantageous.

The embodiment according to claims 6 and 7 is the use of the invention also in a V-type internal combustion engine with a particularly preferred embodiment.

In the following, the invention is explained schematically with reference to an embodiment in two figures.

1 schematically shows a vertical section through an internal combustion engine according to the invention transversely to a longitudinal axis, with marked coolant guide.

2 schematically shows a horizontal section through an internal combustion engine according to the invention, with marked coolant guide.

Below, the same reference numerals apply to like components in both figures.

1 schematically shows a vertical section through an internal combustion engine according to the invention 1 transverse to a longitudinal axis, not shown, with indicated by arrows coolant guide. The internal combustion engine 1 has at least three cylinders 2 . 2 ' . 2 '' represented in 2 in a crankcase 12 arranged in a row on. The longitudinal axis is defined by the cylinder arranged in series (longitudinal axis) 2 . 2 ' . 2 '' , Next, the internal combustion engine 1 a cylinder head 3 on with an intake 4 and an outlet side 5 , characterized by two directional arrows. On the inlet side 4 fresh combustion air flows into the cylinders 2 . 2 ' . 2 '' , the exhaust gases are on the exhaust side 5 discharged again. Between the cylinders 2 . 2 ' . 2 '' is each from the crankcase 12 a dock area 6 formed the cylinder 2 . 2 ' . 2 '' separates each other.

For the crankcase 12 are a first and a second, largely parallel to the longitudinal axis the internal combustion engine 1 aligned coolant channel 7 . 8th intended for a coolant. In further embodiments, the first and second coolant channels 7 . 8th also in the crankcase 12 or in the cylinder head 3 or in the crankcase 12 and in the cylinder head 3 together or as separate, external coolant channels 7 . 8th be educated. Next are the first and second coolant channels 7 . 8th by at least one bar bore 9 . 9 ' , in the present case two V-holes per bar area 6 , connected to each other leading coolant.

Furthermore, the cylinder head 3 can be traversed by the coolant transversely and longitudinally to the longitudinal axis, wherein more than 50% of the coolant, the cylinder head 3 flow across. During operation of the internal combustion engine 1 is coolant from a coolant inlet channel 11 to the first coolant channel 7 promoted. Starting from the first coolant channel 7 the coolant, as shown above, through the cylinder head 3 promoted.

In addition, the coolant flows through the web bores 9 . 9 from the first coolant channel 7 to the second coolant channel 8th , Starting from the second coolant channel 8th the coolant continues to flow to a coolant pump, not shown, of the internal combustion engine 1 ,

In the present embodiment, the cylinder head of about 70% of the coolant is traversed transversely and about 30% longitudinally. Thus according to the invention a uniform temperature of the internal combustion engine 1 takes place, is the first coolant channel 7 formed such that a flow cross-section of the first coolant channel 7 smaller in the flow direction of the coolant and a flow cross-section of the second coolant channel 8th becomes larger in the flow direction of the coolant. This is recognizable in 2 ,

Furthermore, in this embodiment, the first coolant channel 7 inlet side and the second coolant channel 8th arranged on the outlet side. A mirrored arrangement is possible.

Next can through the bridge hole 9 . 9 ' and through the cylinder head 3 at least 50% of the total subsidized coolant to be conveyed transversely to the longitudinal axis.

In this preferred embodiment, the web holes 9 . 9 ' from the coolant from the inlet side 4 to the outlet side 5 flows through. As a result, an extremely homogeneous temperature of the internal combustion engine is achieved. An opposite flow with coolant is possible, but not so efficient.

Furthermore, for example, on the coolant inlet channel 11 , in any case in the flow direction of the coolant after the coolant pump and before the first coolant channel 7 , a throttle element 10 be provided for the coolant. With the help of this throttle element 10 the coolant flow through the cylinder head during the warm-up phase of the internal combustion engine 1 be reduced or completely shut off, so that the fastest possible heating of the internal combustion engine 1 is possible. By this measure, the internal friction of the internal combustion engine is significantly reduced, whereby the pollutant raw emissions lowered and the fuel consumption can be reduced.

Of course, the inventive design of the coolant guide for an internal combustion engine 1 V-type with two rows of cylinders are provided. In this exemplary embodiment, the outlet sides are preferred 5 the two rows of cylinders within the V, ie between the cylinder heads 3 arranged.

2 shows a horizontal section through the internal combustion engine 1 with the schematically drawn, inventive coolant circuit. As already described, the coolant flows from the coolant inlet channel 11 in the first coolant channel 7 and from there mainly across the cylinder head 3 as well as through the bar holes 9 . 9 ' , The coolant is in this case in the second coolant channel 8th promoted and from there in the direction of the coolant pump, not shown. The rest of the coolant circuit is not considered here.

According to the invention, the flow cross-section of the first coolant channel 7 smaller in the flow direction of the coolant and the flow cross-section of the second coolant channel 8th larger in the flow direction of the coolant. This reduction or enlargement of the flow cross sections can be linear, or as in 2 shown, done in stages. In the present embodiment, the flow cross section is reduced or the flow cross section of the first coolant channel increases 7 and the second coolant channel 8th corresponding to the four cylinders by 25% each. With more or fewer cylinders for an internal combustion engine 1 However, this factor may differ according to the number of cylinders.

Next, in the 1 and 2 illustrated internal combustion engine 1 each jetty 6 two bar bores 9 . 9 ' in, in other embodiments, only a single web bore 9 each jetty 6 be provided. Instead of a bridge hole 9 . 9 ' For example, a slot can be provided.

The inventive design thus an extremely homogeneous heating of the internal combustion engine 1 guaranteed. During the warm-up of the internal combustion engine 1 results in an optimized lubricant heating by the heat transfer from hot zones of the cylinder head 3 in lubricant-carrying structures of the base engine, which leads to a friction loss and thus fuel economy. Next is exploited with the inventive design, a previously unused thermal potential. All customer-relevant operating conditions, including the passenger compartment heating, are secured. Furthermore, secure component protection is achieved by directly addressing significant factors of internal combustion engine functional elements. Finally, the coolant flow rate through the cylinder head 3 increased, in the form that a "cool head" and a "hot foot" are present.

LIST OF REFERENCE NUMBERS

1

Internal combustion engine

2, 2 ', 2' '

cylinder

3

cylinder head

4

inlet side

5

outlet

6

web region

7

first coolant channel

8th

second coolant channel

9, 9 '

Steg hole

10

throttle element

11

Coolant inlet channel

12

crankcase

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102005037384 A1 [0002, 0003]

Claims (7)

Internal combustion engine ( 1 ) with at least three cylinders ( 2 . 2 ' . 2 '' ) in series in a crankcase ( 12 ) and with a cylinder head ( 3 ) with an inlet ( 4 ) and an outlet side ( 5 ), and in each case a land area ( 6 ) between the cylinders ( 2 . 2 ' . 2 '' ), wherein for the cylinder head ( 3 ) and / or the crankcase ( 12 ) a first and a second, substantially parallel to a longitudinal axis ( 1' ) of the internal combustion engine ( 1 ) arranged coolant channel ( 7 . 8th ) is provided for a coolant, wherein the first and the second coolant channel ( 7 . 8th ) by at least one web bore ( 9 . 9 ' ) are connected to each other leading coolant and wherein the cylinder head ( 3 ) largely transversely and partially longitudinally to the longitudinal axis ( 1' ) through which the coolant can flow, characterized in that a flow cross-section of the first coolant channel ( 7 ) smaller in the flow direction of the coolant and a flow cross-section of the second coolant channel ( 8th ) becomes larger in the flow direction of the coolant. Internal combustion engine according to claim 1, characterized in that the first coolant channel ( 7 ) inlet side and the second coolant channel ( 8th ) is arranged on the outlet side. Internal combustion engine according to claim 1 or 2, characterized in that through the web bore ( 9 . 9 ' ) and through the cylinder head ( 3 ) at least 50% of the total conveyed coolant transverse to the longitudinal axis ( 1' ) is eligible. Internal combustion engine according to one of the claims 1 to 3, characterized in that the web bore ( 9 . 9 ' ) of the coolant from the inlet side ( 4 ) to the outlet side ( 5 ) can be flowed through. Internal combustion engine according to one of the claims 1 to 4, characterized in that at a coolant inflow to the cylinder head ( 3 ) a throttle element ( 10 ) is provided for the coolant. Internal combustion engine according to one of the claims 1 to 5, characterized in that the internal combustion engine ( 1 ) is a V-type internal combustion engine with two rows of cylinders. Internal combustion engine according to claim 6, characterized in that the outlet sides ( 5 ) of the two rows of cylinders in the V are arranged.

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