DE102019006034A1 - Cooling-optimized cylinder head and optimized cylinder head cooling process - Google Patents

Abstract

The invention relates, inter alia, to a cylinder head (10). A first, second and third coolant duct (46, 48, 50) are arranged downstream of a coolant inlet (28) and through which coolant can flow in parallel from the coolant inlet (28). A coolant space (62) is designed for cooling a receptacle (26) and is arranged downstream of the first, second and third coolant ducts (46, 48, 50). An upper coolant jacket (38) is arranged downstream of the coolant space (62).

Description

The invention relates to a cylinder head for covering a combustion chamber of an internal combustion engine and a method for cooling a cylinder head.

Cylinder heads of internal combustion engines can, for example, have a water jacket for cooling. Depending on the arrangement and design, the water jacket can cool thermally highly stressed areas of the cylinder head.

In particular, the valve web areas that are arranged between the individual gas ducts of the cylinder head and between the fire deck and the intermediate deck of the cylinder head can require particularly effective cooling. On the one hand, the fire deck can be cooled with the combustion chamber side of the cylinder head. On the other hand, the valve seats on the combustion chamber side for the valves arranged in the gas guide channels can be cooled in this way. In addition, a fuel injector or a spark plug, for example, can have a comparatively large cooling requirement.

The DE 38 02 886 A1 discloses a cylinder head for water-cooled internal combustion engines with a water jacket, a central receiving bore for an injection nozzle or spark plug, several valves and bores in the area of the water jacket through which cooling water is fed to the webs between the valves.

The DE 44 20 130 C1 discloses a cylinder head with four valves and a centrally located injection valve for an internal combustion engine. Coolant bores run in the immediate vicinity of inlet and outlet channels from a circumference of the cylinder head to an internal water space of the cylinder head.

The invention is based on the object of creating an alternative and / or improved technique for cooling a cylinder head.

The object is achieved by the features of the independent claims. Advantageous developments are given in the dependent claims and the description.

The invention provides a cylinder head for covering a combustion chamber of an internal combustion engine. The cylinder head has first and second exhaust ducts for discharging exhaust gas from the combustion chamber and first and second intake ducts for supplying combustion air to the combustion chamber. The cylinder head has a (z. B. central) receptacle for a mounting sleeve, a fuel injector or a spark plug. The cylinder head has a preferably single coolant inlet (for example on the cylinder head bottom side) for connecting to a coolant source. The cylinder head has a first coolant channel which is arranged (e.g. in a valve land area) between the first and second outlet channels, a second coolant channel which is arranged (e.g. in a valve land area) between the second outlet channel and the first inlet channel , and a third coolant channel which is arranged (for example in a valve land area) between the first outlet channel and the second inlet channel. The first, second and third coolant ducts are arranged (for example directly) downstream of the coolant inlet and coolant from the coolant inlet can flow through them in parallel. The cylinder head has a coolant space which is designed to cool the receptacle and is arranged downstream of the first, second and third coolant ducts. The cylinder head has an upper coolant jacket which is arranged downstream of the coolant space.

The cylinder head enables the inflowing coolant to first cool the valve web areas, which are particularly thermally stressed, between the outlet ducts and between one outlet duct and one inlet duct. Immediately afterwards, the fuel injector or the spark plug, which also have a high cooling requirement, can be cooled directly. The fuel injector or the spark plug is cooled while the coolant flows upwards into the upper coolant jacket in order to cool the valve guides there, for example.

For example, cooling water can be used as the coolant.

In one embodiment, the first, second and third coolant channel and the coolant inlet are in fluid connection with one another in such a way that a coolant flow entering through the coolant inlet is divided into (e.g. exactly) three coolant partial flows, with a first coolant partial flow preferably flowing through the first coolant channel second coolant partial flow flows through the second coolant channel and / or a third coolant partial flow flows through the third coolant channel.

In one development, the first, second and / or third coolant ducts are designed such that the first coolant partial flow is greater than the second coolant partial flow and / or greater than the third coolant partial flow. It is possible for the second partial coolant flow and the third partial coolant flow to be essentially the same size. It is also possible for the first partial coolant flow to be in a range between 40% and 60%, preferably around 50%, of the incoming coolant flow. It is It is also possible that the second partial coolant flow is in a range between 15% and 35%, preferably around 25%, of the incoming coolant flow, and / or the third partial coolant flow is in a range between 15% and 35%, preferably around 25% of the incoming Coolant flow is. In this way it can be ensured, for example, that the thermally most heavily loaded valve land area between the two outlet channels is cooled the most.

In a further exemplary embodiment, the first, second and / or third coolant channel and the coolant space are in fluid connection with one another in such a way that at least part of a combined coolant flow from the first, second and / or third coolant channel flows through the coolant space.

In a further exemplary embodiment, the coolant space is arranged in such a way that coolant flowing in the coolant space enters the receptacle, a mounting sleeve received in the receptacle (e.g. for a fuel injector or a spark plug), a fuel injector received in the receptacle or one received in the receptacle Spark plug, washed around, preferably directly. In this way, the component accommodated in the receptacle can also be effectively cooled.

In one embodiment, the coolant space is annular and / or surrounds the receptacle coaxially.

In a further embodiment, the upper coolant jacket is arranged between an intermediate deck and an upper deck of the cylinder head. It is possible for the upper coolant jacket to be annular and / or for the upper coolant jacket to be designed for cooling valve guides of the cylinder head.

In a further embodiment, the coolant space and the upper coolant jacket are in fluid connection with one another in such a way that coolant flows at least partially upwards from the first, second and third coolant ducts through the coolant space to the upper coolant jacket.

In one embodiment variant, the cylinder head has a fourth coolant channel, which is arranged between the first inlet channel and the second inlet channel and (for example directly) downstream of the first, second and third coolant channel. This valve land area can thus also be effectively cooled. The fourth coolant channel can preferably be arranged between a fire deck and an intermediate deck of the cylinder head. For example, the fourth coolant channel can be arranged to cool a fire deck of the cylinder head, the first and second inlet channels and / or valve seats of the first and second inlet channels.

In a further development, the coolant chamber and the fourth coolant channel are in fluid connection with the first, second and third coolant channels that a combined coolant flow from the first, second and third coolant channel (e.g. only) into a fourth partial coolant flow through the fourth coolant channel and is divided into a fifth partial coolant flow through the coolant space.

In one development, the fourth coolant channel and the coolant space are designed in such a way that the fifth partial coolant flow is greater than or, to the west, the same size as the fourth partial coolant flow. It is possible that the fifth coolant partial flow is in a range between 50% and 75% of the combined coolant flow and / or the fourth coolant partial flow is in a range between 25% and 50% of the combined coolant flow. It can thus be ensured that the cooling required by the fuel injector or the spark plug and the valve guides can be provided by the fifth partial coolant flow.

In a further embodiment variant, the cylinder head also has a preferably single coolant outlet (e.g., on the cylinder head bottom side), which is arranged (e.g. directly) downstream of the upper coolant jacket and the fourth coolant channel.

In a further development, a transition from the upper coolant jacket to the coolant outlet is arranged on the same side of the cylinder head as the coolant outlet. It is possible that an overflow from the upper coolant jacket and the fourth coolant channel merge adjacent to or next to the coolant outlet. Alternatively or additionally, the transition can be arranged on a side of the cylinder head opposite the coolant inlet. In this way, the lowest possible pressure loss can be brought about, so that the desired mass flow for the fifth partial coolant flow can be achieved.

In a further embodiment variant, the coolant outlet is in fluid connection with the upper coolant jacket and the fourth coolant channel such that the fifth partial coolant flow from the upper coolant jacket and the fourth partial coolant flow from the fourth coolant channel combine and flow to the coolant outlet.

In one embodiment, the first coolant channel is arranged for cooling a fire deck of the cylinder head, the first and second exhaust ports and / or valve seats of the first and second exhaust ports. Alternatively or In addition, the second coolant channel is arranged for cooling a fire deck of the cylinder head, the second exhaust port, the first intake port and / or valve seats of the second exhaust port and the first intake port. Alternatively or additionally, the third coolant channel is arranged for cooling a fire deck of the cylinder head, the first exhaust port, the second intake port and / or valve seats of the first exhaust port and the second intake port.

In a further exemplary embodiment, the first, second and / or third coolant channel is arranged between a fire deck and an intermediate deck of the cylinder head.

In one embodiment, a lower coolant jacket of the cylinder head has the first, second, third and / or fourth coolant channel.

In a further embodiment, the coolant space is arranged between a lower coolant jacket of the cylinder head and the upper coolant jacket

It is possible for the lower coolant jacket to be arranged between a fire deck and an intermediate deck of the cylinder head.

It is possible for the upper coolant jacket to be arranged between an intermediate deck and an upper deck of the cylinder head.

The first coolant channel, the second coolant channel, the third coolant channel, the fourth coolant channel, the coolant inlet, the coolant outlet, the coolant space, the upper coolant jacket, the lower coolant jacket and / or the transition can preferably be cast.

It is possible for coolant to flow through the first, second and / or third coolant channel in a radial direction inward with respect to a central axis of the cylinder head and / or to flow through the fourth coolant channel in a radial direction outward with respect to the central axis.

It is possible for the coolant space to be arranged coaxially to a central axis of the cylinder head.

The invention also relates to a motor vehicle, preferably a utility vehicle (e.g. truck or bus), with a cylinder head as disclosed herein.

It is also possible to use the cylinder head as disclosed herein for passenger cars, large engines, all-terrain vehicles, stationary engines, marine engines, etc.

The invention also relates to a method for cooling a cylinder head, preferably as disclosed herein. The method includes supplying a coolant flow to the cylinder head (for example by means of a coolant inlet). The method comprises dividing the coolant flow into a first coolant partial flow, a second coolant partial flow and a third coolant partial flow. The method includes cooling an area between a first outlet channel and a second outlet channel of the cylinder head by means of the first coolant partial flow (for example by means of a first coolant channel). The method includes cooling an area between the second outlet channel and a first inlet channel of the cylinder head by means of the second coolant partial flow (for example by means of a second coolant channel). The method includes cooling an area between the first outlet channel and a second inlet channel of the cylinder head by means of the third coolant partial flow (for example by means of a third coolant channel). The method includes combining the first, second and third coolant substreams. The method has a division of the combined coolant flow into a fourth coolant partial flow and a fifth coolant partial flow. The method includes cooling an area around an assembly sleeve, a fuel injector or a spark plug by means of the fifth partial coolant flow (e.g. by means of a coolant chamber) and then cooling an upper coolant jacket and / or valve guides for valves of the cylinder head by means of the fifth partial coolant flow. The method preferably also includes cooling of an area between the first inlet channel and the second inlet channel by means of the fourth partial coolant flow (for example by means of a fourth coolant channel). The method enables the same advantages to be achieved as already described for the cylinder head.

Preferably, the method can further include combining the fourth partial coolant flow and the fifth partial coolant flow, for example after cooling the area between the first inlet channel and the second inlet channel by means of the fourth partial coolant flow and / or after cooling the upper coolant jacket and / or the valve guides by means of of the fifth partial coolant flow.

For example, the method can further include discharging the combined coolant flow from the cylinder head (for example by means of a coolant outlet).

• 1 eine Querschnittansicht eines Zylinderkopfes gemäß einem Ausführungsbeispiel der vorliegenden Offenbarung; und
• 2 eine Längsschnittansicht durch den beispielhaften Zylinderkopf.

The preferred embodiments and features of the invention described above can be combined with one another as desired. Further details and advantages of the invention are provided in Described below with reference to the accompanying drawings. Show it:

• 1 a cross-sectional view of a cylinder head according to an embodiment of the present disclosure; and
• 2 a longitudinal sectional view through the exemplary cylinder head.

The embodiments shown in the figures match at least in part, so that similar or identical parts are provided with the same reference symbols and reference is made to the description of the other embodiments or figures for their explanation in order to avoid repetition.

The 1 and 2 show a cylinder head 10 in different sectional views. The 1 shows a cross-sectional view at the level of the valve webs of the cylinder head 10 , roughly between the intermediate deck and the fire deck of the cylinder head 10 , looking towards the fire deck or downwards. The 2 shows a longitudinal sectional view showing a coolant inlet with a coolant outlet of the cylinder head 10 connects.

The cylinder head 10 is for covering a combustion chamber 12th an internal combustion engine 14th trained (see 2 ). For example, the cylinder head 10 by means of several bolts with an engine block (crankcase) 16 the internal combustion engine 14th be screwed. The internal combustion engine can preferably 14th be included in a motor vehicle, preferably a commercial vehicle, for driving the motor vehicle. The internal combustion engine 14th can for example be designed as an in-line engine or as a V-engine.

The cylinder head 10 is designed as a single cylinder cylinder head to cover a single combustion chamber 12th the internal combustion engine 14th executed. It is also possible that the cylinder head 10 as a multi-cylinder cylinder head for covering several combustion chambers of the internal combustion engine 14th is executed. Preferably, the cylinder head 10 be poured.

The cylinder head 10 has two inlet ports 18th , 20th and two outlet channels 22nd , 24 on. By means of the two inlet channels 18th can combustion air to the combustion chamber 12th are fed. By means of the two outlet channels 22nd , 24 can exhaust gas from the combustion chamber 12th be discharged. The channels 18th , 20th , 22nd , 24 point on one side of the combustion chamber of the cylinder head 10 one opening each. The openings can each be closed by a valve (not shown). The valves are preferably designed as poppet valves. The openings can each have a valve seat for the respective valve. Valve seat rings can be used in the valve seats. To open the valves, they can lift off the respective valve seats (or valve seat inserts). To close the valves, they can contact the respective valve seat (or valve seat ring) in a sealing manner. The valves can be operated, for example, via a mechanical valve drive.

The cylinder head 10 assigns a recording 26th on. The recording 26th can be centrally located in the cylinder head 10 be arranged. The recording 26th can have an opening on the combustion chamber side. The opening of the recording 26th can preferably be centrally located between the openings of the channels 18th , 20th , 22nd , 24 be arranged. The recording 26th can be designed to accommodate a desired component (not shown). For example, the recording 26th be designed to accommodate a fuel injector or a spark plug.

The cylinder head 10 has a coolant jacket 36 , 38 , preferably a water jacket, to dissipate heat. The coolant jacket 36 , 38 can be connected directly to the cylinder head 10 be poured. The coolant jacket 36 , 38 is formed from a plurality of coolant spaces and coolant channels that are in fluid communication with one another.

The coolant jacket 36 , 38 has a, preferably single, coolant inlet 28 and a, preferably single, coolant outlet 30th on (see 2 ). Via the coolant inlet 28 can coolant to the coolant jacket 36 , 38 are fed. Via the coolant outlet 30th can (heated) coolant from the coolant jacket 36 , 38 be discharged. The coolant inlet 28 and the coolant outlet 30th are over the several coolant spaces and coolant channels of the coolant jacket 36 , 38 in fluid communication with each other. The coolant inlet 28 and the coolant outlet 30th are preferably on opposite sides of the cylinder head 10 arranged.

In the illustrated embodiment, the coolant inlet is 28 with a coolant supply channel 32 of the engine block 16 connected. The coolant supply channel 32 serves as a coolant source or pressure source. The coolant supply channel 32 can for example be designed as a coolant distribution bar. The coolant supply channel 32 can be supplied with coolant, preferably cooling water, by means of a coolant pump. The coolant outlet 30th is with a coolant discharge duct 34 of the engine block 16 connected. The coolant discharge duct 34 serves as a pressure sink. The coolant discharge duct 34 can for example be designed as a collecting channel. Different arrangements for the coolant inlet 28 and / or the coolant outlet 30th are also possible.

The coolant jacket 36 , 38 can in a lower coolant jacket 36 and an upper coolant jacket 38 be divided. The lower coolant jacket 36 is between a fire deck 40 and an intermediate deck 42 of the cylinder head 10 arranged. The upper coolant jacket 38 is between the tween deck 42 and an upper deck 44 of the cylinder head 10 arranged. The coolant inlet 28 opens into the lower coolant jacket 36 . The lower coolant jacket 36 opens into the coolant outlet 30th .

The lower coolant jacket 36 has four, preferably cast, coolant channels 46 , 48 , 50 , 52 on. The four coolant channels 46 , 48 , 50 , 52 are essentially between the fire deck 40 and the tween deck 42 arranged. The first coolant channel 46 is in a valve land area 54 between the two outlet channels 22nd , 24 arranged. The second coolant channel 48 is in a valve land area 56 between the second outlet channel 24 and the first inlet port 18th arranged. The third coolant channel 50 is in a valve land area 58 between the second inlet port 20th and the first exhaust port 22nd arranged. The fourth coolant channel 52 is in a valve land area 60 between the first inlet port 18th and the second inlet port 20th arranged.

The coolant channels 46 , 48 , 50 can with respect to a central axis of the cylinder head 10 coolant flows through it in a radially inward direction. The fourth coolant channel 52 can be flowed through with coolant in a radial outward direction with respect to the central axis. The coolant channels 46 , 48 , 50 are downstream of the coolant inlet 28 arranged. The fourth coolant channel 52 is downstream of the coolant channels 46 , 48 , 50 arranged.

Through the first coolant channel 46 flowing coolant particularly cools the fire deck 40 , the two exhaust ducts 22nd , 24 and their valve seats. Through the second coolant channel 48 flowing coolant particularly cools the fire deck 40 , the second exhaust port 24 , the first intake port 18th as well as the valve seats of the channels 18th , 24 . Through the third coolant channel 50 flowing coolant particularly cools the fire deck 40 , the second intake port 20th , the first exhaust port 22nd as well as the valve seats of the channels 20th , 22nd . Coolant flowing through the fourth coolant channel cools the fire deck in particular 40 , the two intake ports 18th , 20th as well as their valve seats.

The upper coolant jacket 38 can be made ring-shaped. The upper coolant jacket 38 can record 26th surrounded coaxially and spaced. Through the upper coolant jacket 38 flowing coolant cools the channels in particular 18th , 20th , 22nd , 24 and valve guides for the valves of the channels 18th , 20th , 22nd , 24 .

The lower coolant jacket 36 and the upper coolant jacket 38 are (e.g. only) in fluid communication with one another via a coolant space 62 and a transfer 64 .

The coolant room 62 is downstream of the channels 20th , 22nd , 24 arranged. The coolant room 62 is upstream of the upper coolant jacket 38 arranged. The coolant space can preferably 62 be annular and the inclusion 26th surrounded coaxially. Through the coolant compartment 62 flowing coolant can, for example, be a mounting sleeve 66 (for example for a fuel injector or a spark plug) that is in the receptacle 26th is absorbed, rinse immediately and cool. The mounting sleeve 66 can be sealed in the intake 26th be arranged. The coolant room 62 is from below from the lower coolant jacket 36 up to the upper coolant jacket 38 flows through.

The transfer 64 is downstream of the upper coolant jacket 38 arranged. The transfer 64 is preferably on the side of the cylinder head 10 arranged on which the coolant outlet 30th is arranged. This is preferably the side of the cylinder head 10 that is the side of the cylinder head on which the coolant enters 28 is arranged, is opposite. The transfer 64 is from above from the upper coolant jacket 38 down to the lower coolant jacket 36 flows through.

The following shows the coolant flow from the coolant inlet caused by the arrangement described above 28 to the coolant outlet 30th with reference to the 1 and 2 described.

The coolant is supplied via the coolant supply channel 32 fed. The coolant flows from the coolant supply channel 32 in a coolant flow (e.g. total coolant flow) K1 (see arrow in 1 and 2 ) into the coolant inlet 28 . After flowing in through the coolant inlet 28 the coolant flow divides K1 directly into three coolant partial flows T1 , T2 and T3 on.

The first partial coolant flow T1 flows through the first coolant channel 46 and cools the surrounding areas. The second partial coolant flow T2 flows through the second coolant channel 48 and also cools the surrounding areas. The third partial coolant flow T3 flows through the third coolant channel 50 and also cools the surrounding areas. As a result, the freshly supplied coolant first cools the valve land areas 54 , 56 and 58 that are thermally highly stressed. The valve land area 54 is between the two outlet channels 22nd , 24 arranged in the operation of the Internal combustion engine 14th lead hot exhaust gas. The valve land area 54 can therefore be exposed to particularly high thermal loads. Also the two valve land areas 56 and 58 each border on one of the two outlet channels 22nd , 24 and are therefore also subject to high thermal loads.

The coolant channels are preferably 46 , 48 and 50 so dimensioned and arranged relative to one another that, taking into account the pressure losses occurring, the first partial coolant flow T1 , which is the thermally most heavily loaded valve land area 54 flows through, is greatest in order to develop the greatest cooling effect. For example, the first partial coolant flow T1 in a range between 40% and 60%, preferably around 50%, of the incoming coolant flow K1 be, for example, based on a mass flow of the coolant. The second partial coolant flow and the third partial coolant flow T3 can, for example, each in a range between 15% and 35%, preferably around 25%, of the incoming coolant flow K1 be, for example, based on a mass flow of the coolant.

The partial coolant flows T1 , T2 and T3 can be located in a central area of the lower coolant jacket 36 reunite. The central area can be designed, for example, as an annular space that contains the receptacle 26th surrounds. The thus combined coolant flow (e.g. total coolant flow) can in turn be divided into two partial coolant flows T4 and T5 be divided.

The fourth partial coolant flow T4 flows through the fourth coolant channel 52 and cools the surrounding areas. The valve land area 60 , the fourth coolant channel 52 surrounds is less thermally stressed than the valve land areas 54 , 56 , 58 , as the valve land area 60 only to the two inlet ports 18th , 20th borders the relatively cool combustion air to the combustion chamber during operation 12th respectively.

The fifth partial coolant flow T5 flows from the central area of the lower coolant jacket 36 up through the coolant compartment 62 into the upper coolant jacket 38 . When flowing through the coolant compartment 62 can that in the recording 26th arranged component are indirectly or directly flowed around with coolant and thereby cooled. For example, the mounting sleeve 66 directly flowed around so that in the mounting sleeve 66 arranged component, for example the fuel injector or the spark plug, are effectively cooled. This means that the coolant partial flow can still be comparatively cool T5 For example, the thermally highly stressed fuel injector can be effectively cooled.

After flowing through the coolant compartment 62 reaches the fifth partial coolant flow T5 the upper coolant jacket 38 and cools the surrounding areas. The fifth partial coolant flow T5 ultimately flows through the transition 64 from the upper coolant jacket 38 back into the lower coolant jacket 36 . This is where the fourth partial coolant flow merges T4 and the fifth partial coolant flow T5 together. The thus combined coolant flow (e.g. total coolant flow) K2 leaves the cylinder head 10 through the coolant outlet 30th into the coolant discharge channel 34 of the engine block 16 .

The one through the fifth partial coolant flow T5 Cooling requirement to be covered with regard to the mounting sleeve 66 and the upper coolant jacket 38 can be greater than that through the fourth partial coolant flow T4 Cooling requirement to be covered with regard to the valve land area 60 . Preferably, therefore, the coolant space 62 , the upper coolant jacket 38 and the fourth coolant channel 52 be dimensioned and arranged relative to one another in such a way that, taking into account the pressure losses occurring, the fifth partial coolant flow T5 greater than or at least the same size as the fourth partial coolant flow T4 is. The fifth partial coolant flow can preferably be used T5 in a range between 50% and 75% of the previously combined coolant flow from the coolant partial flows T1 , T2 and T3 be e.g. B. based on a mass flow of the coolant. The fourth partial coolant flow T4 can be in a range between 25% and 50% of the combined coolant flow from the coolant partial flows T1 , T2 and T3 be e.g. B. based on a mass flow of the coolant.

The invention is not restricted to the preferred exemplary embodiments described above. Rather, a large number of variants and modifications are possible which also make use of the inventive concept and therefore fall within the scope of protection. In particular, the invention also claims protection for the subject matter and the features of the subclaims independently of the claims referred to. In particular, the individual features of independent claim 1 are disclosed independently of one another. In addition, the features of the subclaims are also independent of all the features of independent claim 1 and, for example, independent of the features relating to the presence and / or configuration of the first and second outlet channels, the first and second inlet channels, the receptacle, the coolant inlet, the first coolant channel , the second coolant channel, the third coolant channel and / or the coolant space of independent claim 1 disclosed. All range specifications herein are to be understood as disclosed in such a way that all values falling within the respective range are disclosed individually are e.g. B. also as the respectively preferred narrower outer boundaries of the respective area.

List of reference symbols

10

Cylinder head

12th

Combustion chamber

14th

Internal combustion engine

16

Engine block

18th

First inlet port

20th

Second inlet port

22nd

First exhaust port

24

Second outlet port

26th

admission

28

Coolant inlet

30th

Coolant leak

32

Coolant supply channel

34

Coolant discharge duct

36

Lower coolant jacket

38

Upper coolant jacket

40

Fire deck

42

Between deck

44

Upper deck

46

First coolant channel

48

Second coolant channel

50

Third coolant channel

52

Fourth coolant channel

54

Valve land area

56

Valve land area

58

Valve land area

60

Valve land area

62

Coolant compartment

64

Transfer

66

Assembly sleeve

K1, K2

Coolant flow

T1-T5

Partial coolant flow

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was 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.

Patent literature cited

• DE 3802886 A1 [0004]
• DE 4420130 C1 [0005]

Claims (15)

Cylinder head (10) for covering a combustion chamber (12) of an internal combustion engine (14), comprising: first and second exhaust ducts (22, 24) for discharging exhaust gas from the combustion chamber (12); first and second inlet ducts (18, 20) for supplying combustion air to the combustion chamber (12); a receptacle (26) for a mounting sleeve (66), a fuel injector or a spark plug; one, preferably single, coolant inlet (28) for connecting to a coolant source, a first coolant channel (46) disposed between the first and second outlet channels (22, 24); a second coolant channel (48) arranged between the second outlet channel (24) and the first inlet channel (18); a third coolant channel (50) which is arranged between the first outlet channel (22) and the second inlet channel (20), wherein the first, second and third coolant channels (46, 48, 50) are arranged downstream of the coolant inlet (28) and with Coolant can flow through in parallel from the coolant inlet (28); a coolant space (62) which is designed to cool the receptacle (26) and is arranged downstream of the first, second and third coolant ducts (46, 48, 50); and an upper coolant jacket (38) disposed downstream of the coolant space (62). Cylinder head (10) Claim 1 , wherein: the first, second and third coolant ducts (46, 48, 50) and the coolant inlet (28) are in fluid communication with one another in such a way that a coolant flow (K1) entering through the coolant inlet (28) divides into three coolant partial flows (T1, T2 , T3), a first partial coolant flow (T1) flowing through the first coolant channel (46), a second partial coolant flow (T2) flowing through the second coolant channel (48) and a third partial coolant flow (T3) flowing through the third coolant channel (50). Cylinder head (10) Claim 2 , wherein the first, second and third coolant channels (46, 48, 50) are designed such that: the first coolant partial flow (T1) is greater than the second coolant partial flow (T2) and / or greater than the third coolant partial flow (T3); and / or the second coolant partial flow (T2) and the third coolant partial flow (T3) are essentially the same size; and / or the first partial coolant flow (T1) is in a range between 40% and 60%, preferably around 50%, of the incoming coolant flow (K1); and / or the second partial coolant flow (T2) is in a range between 15% and 35%, preferably around 25%, of the incoming coolant flow (K1); and / or the third partial coolant flow (T3) is in a range between 15% and 35%, preferably around 25%, of the incoming coolant flow (K1). Cylinder head (10) according to one of the preceding claims, wherein: the first, second and third coolant ducts (46, 48, 50) and the coolant space (62) are in fluid communication with one another such that at least part of a combined coolant flow from the first, second and third coolant ducts (46, 48, 50) enters the coolant space (62) flows through; and or the coolant chamber (62) is arranged in such a way that coolant flowing in the coolant chamber (62) enters the receptacle (26), a mounting sleeve (66) housed in the receptacle (26), a fuel injector housed in the receptacle (26) or one in the Receptacle (26) flushed around the spark plug, preferably directly; and or the coolant space (62) is annular and / or surrounds the receptacle (26) coaxially. Cylinder head (10) according to one of the preceding claims, wherein: the upper coolant jacket (38) is arranged between an intermediate deck (42) and an upper deck (44) of the cylinder head (10); and or the upper coolant jacket (38) is annular; and or the upper coolant jacket (38) is designed for cooling valve guides of the cylinder head (10). Cylinder head (10) according to one of the preceding claims, wherein: the coolant space (62) and the upper coolant jacket (38) are in fluid communication with one another in such a way that coolant from the first, second and third coolant ducts (46, 48, 50) at least partially upwards through the coolant space (62) to the upper coolant jacket ( 38) flows. Cylinder head (10) according to one of the preceding claims, further comprising: a fourth coolant channel (52) disposed between the first inlet channel (18) and the second inlet channel (20) and downstream of the first, second and third coolant channels (46, 48, 50), preferably wherein: the fourth coolant channel (52) is arranged between a fire deck (40) and an intermediate deck (42) of the cylinder head (10); and or the fourth coolant duct (52) is arranged for cooling a fire deck (40) of the cylinder head (10), the first and second inlet ducts (18, 20) and valve seats of the first and second inlet ducts (18, 20). Cylinder head (10) Claim 7 wherein: the coolant space (62) and the fourth coolant channel (52) are in fluid communication with the first, second and third coolant channels (46, 48, 50) such that a combined coolant flow from the first, second and third coolant channels (46, 48, 50) is divided into a fourth partial coolant flow (T4) through the fourth coolant channel (52) and a fifth partial coolant flow (T5) through the coolant space (62). Cylinder head (10) Claim 8 , wherein the fourth coolant channel (52) and the coolant space (62) are designed such that: the fifth partial coolant flow (T5) is greater than or to the west the same size as the fourth partial coolant flow (T4); and / or the fifth coolant partial flow (T5) is in a range between 50% and 75% of the combined coolant flow; and / or the fourth coolant partial flow (T4) is in a range between 25% and 50% of the combined coolant flow. Cylinder head (10) according to one of the preceding claims, further comprising: a, preferably single, coolant outlet (30) which is arranged downstream of the upper coolant jacket (38) and the fourth coolant channel (52). Cylinder head (10) Claim 10 , wherein: a transition (64) from the upper coolant jacket (38) to the coolant outlet (30) is arranged on the same side of the cylinder head (10) as the coolant outlet (30) and / or on a side opposite the coolant inlet (28) the cylinder head (10) is arranged; and / or an overflow (64) from the upper coolant jacket (38) and the fourth coolant channel (52) merge adjacent to or next to the coolant outlet (30); and / or the coolant outlet (30) is in fluid communication with the upper coolant jacket (38) and the fourth coolant channel (52) that the fifth partial coolant flow (T5) from the upper coolant jacket (38) and the fourth partial coolant flow (T4) from unite the fourth coolant channel (52) and flow to the coolant outlet (30). Cylinder head (10) according to one of the preceding claims, wherein: the first coolant channel (46) is arranged for cooling a fire deck (40) of the cylinder head (10), the first and second exhaust ports (22, 24) and valve seats of the first and second exhaust ports (22, 24); and or the second coolant channel (48) is arranged for cooling a fire deck (40) of the cylinder head (10), the second exhaust port (24), the first intake port (18) and valve seats of the second exhaust port (24) and the first intake port (18) ; and or the third coolant channel (50) is arranged for cooling a fire deck (40) of the cylinder head (10), the first exhaust port (22), the second intake port (20) and valve seats of the first exhaust port (22) and the second intake port (20) . Cylinder head (10) according to one of the preceding claims, wherein: the first, second and third coolant ducts (46) are arranged between a fire deck (40) and an intermediate deck (42) of the cylinder head (10); and or a lower coolant jacket (36) of the cylinder head (10) has the first, second and third coolant passages (46); and or the coolant space (62) is arranged between a lower coolant jacket (36) of the cylinder head (10) and the upper coolant jacket (38). Motor vehicle, preferably commercial vehicle, with a cylinder head (10) according to one of the preceding claims. Method for cooling a cylinder head (10), preferably according to one of the preceding claims, comprising: supplying a coolant flow (K1) to the cylinder head (10); Dividing the coolant flow (K1) into a first coolant partial flow (T1), a second coolant partial flow (T2) and a third coolant partial flow (T3); Cooling an area between a first outlet channel (22) and a second outlet channel (24) of the cylinder head (10) by means of the first partial coolant flow (T1); Cooling an area between the second outlet channel (24) and a first inlet channel (18) of the cylinder head (10) by means of the second partial coolant flow (T2); Cooling an area between the first outlet channel (22) and a second inlet channel (20) of the cylinder head (10) by means of the third partial coolant flow (T3); Combining the first, second and third coolant substreams (T1, T2, T3); Dividing the combined coolant flow into a fourth coolant substream (T4) and a fifth coolant substream (T5); and cooling an area around a mounting sleeve (66), a fuel injector or a spark plug by means of the fifth partial coolant flow (T5) and then cooling an upper coolant jacket (38) and / or valve guides for valves of the cylinder head (10) by means of the fifth partial coolant flow (T5) ); and preferably: cooling an area between the first inlet channel (18) and the second inlet channel (20) by means of the fourth partial coolant flow (T4).

Images