Cooling-optimised cylinder head and optimised cylinder head cooling method

Abstract

The invention relates, inter alia, to a cylinder head (10). A first, a second and a third coolant channel (46, 48, 50) are situated downstream of a coolant inlet (28), and coolant can flow through them in parallel from the coolant inlet (28). A coolant chamber (62) is formed for cooling a receptacle (26) and is situated downstream of the first, second and third coolant channels (46, 48, 50). An upper coolant jacket (38) is situated downstream of the coolant chamber (62).

Description

[0001] 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.

[0002] For the state of the art, reference is first made to document AT 6 654 U1.

[0003] For example, cylinder heads of internal combustion engines may have a water jacket for cooling. Depending on the arrangement and design, the water jacket can cool areas of the cylinder head that are subject to high thermal stress.

[0004] In particular, the valve land areas located between the individual gas guide channels of the cylinder head and between the fire deck and the intermediate deck of the cylinder head may require particularly effective cooling. On the one hand, this allows the fire deck to be cooled along with the combustion chamber side of the cylinder head. On the other hand, it allows the valve seats on the combustion chamber side for the valves located in the gas guide channels to be cooled. Furthermore, a fuel injector or a spark plug, for example, may have a comparatively high cooling requirement.

[0005] 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 supplied to the webs between the valves.

[0006] 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 close proximity to the intake and exhaust ports from a periphery of the cylinder head to an internal water chamber of the cylinder head.

[0007] The invention is based on the object of creating an alternative and / or improved technology for cooling a cylinder head.

[0008] The problem is solved by the features of the independent claims. Advantageous further developments are specified in the dependent claims and the description.

[0009] The invention provides a cylinder head for covering a combustion chamber of an internal combustion engine. The cylinder head has first and second exhaust ports for discharging exhaust gas from the combustion chamber and first and second inlet ports for supplying combustion air to the combustion chamber. The cylinder head has a (e.g., central) receptacle for a mounting sleeve, a fuel injector, or a spark plug. The cylinder head has one, preferably single, coolant inlet (e.g., on the cylinder head base side) for connecting to a coolant source. The cylinder head has a first coolant channel, which is arranged (e.g., in a valve land region) between the first and second exhaust ports, a second coolant channel, which is arranged (e.g., in a valve land region) between the second exhaust port and the first inlet port, and a third coolant channel, which (e.g.,in a valve land area) between the first exhaust port and the second intake port. The first, second, and third coolant channels are arranged (e.g., directly) downstream of the coolant inlet and can be flowed through in parallel with coolant from the coolant inlet. The cylinder head has a coolant chamber designed to cool the receptacle and arranged downstream of the first, second, and third coolant channels. The cylinder head has an upper coolant jacket arranged downstream of the coolant chamber.

[0010] The cylinder head allows the incoming coolant to first cool the thermally highly stressed valve land areas between the exhaust ports and between each exhaust port and intake port. Immediately afterward, the fuel injector or spark plug, which also require significant cooling, can be cooled. The fuel injector or spark plug is cooled while the coolant flows upward into the upper coolant jacket, where it can cool the valve guides, for example.

[0011] For example, cooling water can be used as a coolant.

[0012] In one embodiment, the first, second and third coolant channels and the coolant inlet are in fluid communication with one another such that a coolant flow entering through the coolant inlet is divided into (e.g., exactly) three coolant sub-flows, wherein preferably a first coolant sub-flow flows through the first coolant channel, a second coolant sub-flow flows through the second coolant channel and / or a third coolant sub-flow flows through the third coolant channel.

[0013] In a further development, the first, second and / or third coolant channel are designed such that the first coolant partial flow is larger than the second coolant partial flow and / or larger than the third coolant partial flow. It is possible for the second coolant partial flow and the third coolant partial flow to be substantially the same size. It is also possible for the first coolant partial flow to be in a range between 40% and 60%, preferably around 50%, of the incoming coolant flow. It is likewise possible for the second coolant partial flow to be in a range between 15% and 35%, preferably around 25%, of the incoming coolant flow, and / or for the third coolant partial flow to be in a range between 15% and 35%, preferably around 25%, of the incoming coolant flow. This can ensure, for example, that the valve land area between the two outlet channels, which is subject to the highest thermal load, is cooled the most.

[0014] In a further embodiment, the first, second and / or third coolant channel and the coolant chamber are in fluid communication with one another such that at least a portion of a combined coolant flow from the first, second and / or third coolant channel flows through the coolant chamber.

[0015] In a further embodiment, the coolant chamber is arranged such that coolant flowing in the coolant chamber flows, preferably directly, around the receptacle, a mounting sleeve (e.g., for a fuel injector or a spark plug) accommodated in the receptacle, a fuel injector, or a spark plug accommodated in the receptacle. This allows the component accommodated in the receptacle to also be effectively cooled.

[0016] In one embodiment, the coolant chamber is annular and / or surrounds the receptacle coaxially.

[0017] 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 to cool the valve guides of the cylinder head.

[0018] In a further embodiment, the coolant space and the upper coolant jacket are in fluid communication with each other such that coolant flows from the first, second and third coolant channels at least partially upwards through the coolant space to the upper coolant jacket.

[0019] The cylinder head has a fourth coolant passage, which is arranged between the first intake passage and the second intake passage and (e.g. directly) downstream of the first, second and third coolant passages. Thus, this

[0020] The valve land area can be effectively cooled. Preferably, the fourth coolant channel can 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 intake ports, and / or valve seats of the first and second intake ports.

[0021] In a further development, the coolant chamber and the fourth coolant channel are in fluid communication with the first, second and third coolant channels such that a combined coolant flow from the first, second and third coolant channels (e.g. only) is divided into a fourth coolant partial flow through the fourth coolant channel and into a fifth coolant partial flow through the coolant chamber.

[0022] In a further development, the fourth coolant channel and the coolant chamber are configured such that the fifth coolant partial flow is larger than, or approximately equal to, the fourth coolant partial flow. It is possible for the fifth coolant partial flow to be in a range between 50% and 75% of the combined coolant flow, and / or for the fourth coolant partial flow to be in a range between 25% and 50% of the combined coolant flow. This ensures that the cooling required by the fuel injector or the spark plug, as well as the valve guides, can be provided by the fifth coolant partial flow.

[0023] The cylinder head further comprises 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.

[0024] A transition from the upper coolant jacket to the coolant outlet is located on the same side of the cylinder head as the coolant outlet. It is possible for a transition from the upper coolant jacket and the fourth coolant channel to merge adjacent to or next to the coolant outlet. Alternatively or additionally, the transition is located on a side of the cylinder head opposite the coolant inlet. This allows for the lowest possible pressure loss, so that the desired mass flow for the fifth coolant partial flow can be achieved.

[0025] In a further embodiment, the coolant outlet is in fluid communication with the upper coolant jacket and the fourth coolant channel such that the fifth coolant partial flow from the upper coolant jacket and the fourth coolant partial flow from the fourth coolant channel combine and flow to the coolant outlet.

[0026] In one embodiment, the first coolant channel is arranged to cool 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 additionally, the second coolant channel is arranged to cool 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 to cool 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.

[0027] In a further embodiment, the first, second and / or third coolant channel is arranged between a fire deck and an intermediate deck of the cylinder head.

[0028] In one embodiment, a lower coolant jacket of the cylinder head has the first, second, third and / or fourth coolant channel.

[0029] In a further embodiment, the coolant chamber is arranged between a lower coolant jacket of the cylinder head and the upper coolant jacket. It is possible that the lower coolant jacket is arranged between a fire deck and an intermediate deck of the cylinder head.

[0030] It is possible that the upper coolant jacket is arranged between an intermediate deck and an upper deck of the cylinder head.

[0031] Preferably, the first coolant channel, the second coolant channel, the third coolant channel, the fourth coolant channel, the coolant inlet, the coolant outlet, the coolant chamber, the upper coolant jacket, the lower coolant jacket and / or the transition can be cast.

[0032] It is possible for coolant to flow through the first, second and / or third coolant channels in a radially inward direction relative to a central axis of the cylinder head and / or for coolant to flow through the fourth coolant channel in a radially outward direction relative to the central axis.

[0033] It is possible that the coolant chamber is arranged coaxially to a central axis of the cylinder head.

[0034] The invention also relates to a motor vehicle, preferably a commercial vehicle (e.g. truck or bus), with a cylinder head as disclosed herein.

[0035] It is also possible to use the cylinder head as disclosed herein for passenger cars, large engines, off-road vehicles, stationary engines, marine engines, etc.

[0036] The invention also relates to a method for cooling a cylinder head as disclosed herein. The method comprises supplying a coolant flow to the cylinder head (e.g., by means of a coolant inlet). The method comprises dividing the coolant flow into a first coolant sub-flow, a second coolant sub-flow, and a third coolant sub-flow. The method comprises cooling a region between a first outlet port and a second outlet port of the cylinder head by means of the first coolant sub-flow (e.g., by means of a first coolant channel). The method comprises cooling a region between the second outlet port and a first inlet port of the cylinder head by means of the second coolant sub-flow (e.g., by means of a second coolant channel).The method comprises cooling a region between the first exhaust port and a second intake port of the cylinder head by means of the third coolant partial flow (e.g., by means of a third coolant channel). The method comprises combining the first, second, and third coolant partial flows. The method comprises dividing the combined coolant flow into a fourth coolant partial flow and a fifth coolant partial flow. The method comprises cooling a region around a mounting sleeve, a fuel injector, or a spark plug by means of the fifth coolant partial 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 coolant partial flow. Preferably, the method also comprises cooling a region between the first intake port and the second intake port by means of the fourth coolant partial flow (e.g.,by means of a fourth coolant channel). The process enables the same advantages to be achieved as already described for the cylinder head.

[0037] Preferably, the method may further comprise combining the fourth coolant sub-flow and the fifth coolant sub-flow, for example after cooling the region between the first inlet channel and the second inlet channel by means of the fourth coolant sub-flow and / or after cooling the upper coolant jacket and / or the valve guides by means of the fifth coolant sub-flow.

[0038] For example, the method may further comprise discharging the combined coolant flow from the cylinder head (e.g., by means of a coolant outlet).

[0039] The above-described preferred embodiments and features of the invention can be combined with one another as desired. Further details and advantages of the invention are described below with reference to the accompanying drawings. They show: Figure 1 is a cross-sectional view of a cylinder head according to an embodiment of the present disclosure; and Figure 2 is a longitudinal sectional view through the exemplary cylinder head.

[0040] The embodiments shown in the figures correspond at least partially, so that similar or identical parts are provided with the same reference numerals and for their explanation reference is also made to the description of the other embodiments or figures in order to avoid repetition.

[0041] The Figures 1 and 2show a cylinder head 10 in various sectional views. Figure 1 shows a cross-sectional view at the level of the valve lands of the cylinder head 10, i.e. approximately between the intermediate deck and the fire deck of the cylinder head 10, looking towards the fire deck or downwards. Figure 2 shows a longitudinal sectional view connecting a coolant inlet with a coolant outlet of the cylinder head 10.

[0042] The cylinder head 10 is designed to cover a combustion chamber 12 of an internal combustion engine 14 (see Figure 2 ). For example, the cylinder head 10 can be bolted to an engine block (crankcase) 16 of the internal combustion engine 14 by means of several bolts. The internal combustion engine 14 can preferably be incorporated into a motor vehicle, preferably a commercial vehicle, for driving the motor vehicle. The internal combustion engine 14 can be designed, for example, as an in-line engine or as a V-engine.

[0043] The cylinder head 10 is designed as a single-cylinder cylinder head for covering a single combustion chamber 12 of the internal combustion engine 14. It is also possible for the cylinder head 10 to be designed as a multi-cylinder cylinder head for covering multiple combustion chambers of the internal combustion engine 14. Preferably, the cylinder head 10 can be cast.

[0044] The cylinder head 10 has two intake ports 18, 20 and two exhaust ports 22, 24. Combustion air can be supplied to the combustion chamber 12 via the two intake ports 18. Exhaust gas can be discharged from the combustion chamber 12 via the two exhaust ports 22, 24. The ports 18, 20, 22, 24 each have an opening on a combustion chamber side of the cylinder head 10. 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 inserts can be inserted into the valve seats. To open the valves, the valves can lift off from the respective valve seats (or valve seat inserts). To close the valves, the valves can make sealing contact with the respective valve seat (or valve seat insert). The valves can be actuated, for example, via a mechanical valve train.

[0045] The cylinder head 10 has a receptacle 26. The receptacle 26 can be arranged centrally in the cylinder head 10. The receptacle 26 can have an opening on the combustion chamber side. The opening of the receptacle 26 can preferably be arranged centrally between the openings of the channels 18, 20, 22, 24. The receptacle 26 can be configured to accommodate a desired component (not shown). For example, the receptacle 26 can be configured to accommodate a fuel injector or a spark plug.

[0046] The cylinder head 10 has a coolant jacket 36, 38, preferably a water jacket, for heat dissipation. The coolant jacket 36, 38 can be cast directly with the cylinder head 10. The coolant jacket 36, 38 is formed from a plurality of coolant chambers and coolant channels that are in fluid communication with one another.

[0047] The coolant jacket 36, 38 has a, preferably single, coolant inlet 28 and a, preferably single, coolant outlet 30 (see Figure 2 ). Coolant can be supplied to the coolant jacket 36, 38 via the coolant inlet 28. (Heated) coolant can be discharged from the coolant jacket 36, 38 via the coolant outlet 30. The coolant inlet 28 and the coolant outlet 30 are fluidly connected to one another via the plurality of coolant chambers and coolant channels of the coolant jacket 36, 38. The coolant inlet 28 and the coolant outlet 30 are preferably arranged on opposite sides of the cylinder head 10.

[0048] In the illustrated embodiment, the coolant inlet 28 is connected to a coolant supply channel 32 of the engine block 16. The coolant supply channel 32 serves as a coolant source or pressure source. The coolant supply channel 32 can be designed, for example, 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 30 is connected to a coolant discharge channel 34 of the engine block 16. The coolant discharge channel 34 serves as a pressure sink. The coolant discharge channel 34 can be designed, for example, as a collecting channel. Different arrangements for the coolant inlet 28 and / or the coolant outlet 30 are also possible.

[0049] The coolant jacket 36, 38 can be divided into a lower coolant jacket 36 and an upper coolant jacket 38. The lower coolant jacket 36 is arranged between a fire deck 40 and an intermediate deck 42 of the cylinder head 10. The upper coolant jacket 38 is arranged between the intermediate deck 42 and an upper deck 44 of the cylinder head 10. The coolant inlet 28 opens into the lower coolant jacket 36. The lower coolant jacket 36 opens into the coolant outlet 30.

[0050] The lower coolant jacket 36 has four, preferably cast, coolant channels 46, 48, 50, 52. The four coolant channels 46, 48, 50, 52 are arranged substantially between the fire deck 40 and the intermediate deck 42. The first coolant channel 46 is arranged in a valve land region 54 between the two outlet channels 22, 24. The second coolant channel 48 is arranged in a valve land region 56 between the second outlet channel 24 and the first inlet channel 18. The third coolant channel 50 is arranged in a valve land region 58 between the second inlet channel 20 and the first outlet channel 22. The fourth coolant channel 52 is arranged in a valve land region 60 between the first inlet channel 18 and the second inlet channel 20.

[0051] Coolant can flow through the coolant channels 46, 48, 50 in a radially inward direction relative to a center axis of the cylinder head 10. Coolant can flow through the fourth coolant channel 52 in a radially outward direction relative to the center axis. The coolant channels 46, 48, 50 are arranged downstream of the coolant inlet 28. The fourth coolant channel 52 is arranged downstream of the coolant channels 46, 48, 50.

[0052] Coolant flowing through the first coolant channel 46 cools, in particular, the fire deck 40, the two outlet channels 22, 24, and their valve seats. Coolant flowing through the second coolant channel 48 cools, in particular, the fire deck 40, the second outlet channel 24, the first inlet channel 18, and the valve seats of the channels 18, 24. Coolant flowing through the third coolant channel 50 cools, in particular, the fire deck 40, the second inlet channel 20, the first outlet channel 22, and the valve seats of the channels 20, 22. Coolant flowing through the fourth coolant channel cools, in particular, the fire deck 40, the two inlet channels 18, 20, and their valve seats.

[0053] The upper coolant jacket 38 can be annular. The upper coolant jacket 38 can surround the receptacle 26 coaxially and at a distance from it. Coolant flowing through the upper coolant jacket 38 cools, in particular, the channels 18, 20, 22, 24 and the valve guides for the valves of the channels 18, 20, 22, 24.

[0054] The lower coolant jacket 36 and the upper coolant jacket 38 are (e.g. only) in fluid communication with each other via a coolant chamber 62 and a transfer 64.

[0055] The coolant chamber 62 is arranged downstream of the channels 20, 22, 24. The coolant chamber 62 is arranged upstream of the upper coolant jacket 38. The coolant chamber 62 can preferably be annular and coaxially surround the receptacle 26. Coolant flowing through the coolant chamber 62 can, for example, directly flow around and thereby cool a mounting sleeve 66 (for example, for a fuel injector or a spark plug) received in the receptacle 26. The mounting sleeve 66 can be arranged in a sealed manner in the receptacle 26. The coolant chamber 62 is flowed through from below by the lower coolant jacket 36 upwards to the upper coolant jacket 38.

[0056] The overflow 64 is arranged downstream of the upper coolant jacket 38. The overflow 64 is preferably arranged on the side of the cylinder head 10 on which the coolant outlet 30 is arranged. This is preferably the side of the cylinder head 10 opposite the side of the cylinder head on which the coolant inlet 28 is arranged. The coolant flows through the overflow 64 from the top, from the upper coolant jacket 38 downwards to the lower coolant jacket 36.

[0057] The coolant flow from the coolant inlet 28 to the coolant outlet 30 caused by the arrangement described above is shown below with reference to the Figures 1 and 2 described.

[0058] The coolant is supplied via the coolant supply channel 32. The coolant flows from the coolant supply channel 32 in a coolant flow (e.g. total coolant flow) K1 (see arrow in Figures 1 and 2) into the coolant inlet 28. After flowing through the coolant inlet 28, the coolant flow K1 splits directly into three coolant sub-flows T1, T2 and T3.

[0059] The first coolant partial flow T1 flows through the first coolant channel 46, cooling the surrounding areas. The second coolant partial flow T2 flows through the second coolant channel 48, also cooling the surrounding areas. The third coolant partial flow T3 flows through the third coolant channel 50, also cooling the surrounding areas. Consequently, the freshly supplied coolant initially cools the valve land areas 54, 56, and 58, which are subject to high thermal stress. The valve land area 54 is arranged between the two exhaust channels 22, 24, which carry hot exhaust gas during operation of the internal combustion engine 14. The valve land area 54 can therefore be subject to particularly high thermal stress. The two valve land areas 56 and 58 also each border one of the two exhaust channels 22, 24 and are therefore also subject to high thermal stress.

[0060] Preferably, the coolant channels 46, 48, and 50 are dimensioned and arranged relative to one another such that, taking into account the pressure losses that occur, the first coolant partial flow T1, which flows through the valve land region 54 subject to the highest thermal load, is the largest in order to achieve the greatest cooling effect. For example, the first coolant partial flow T1 can be in a range between 40% and 60%, preferably around 50%, of the incoming coolant flow K1, for example based on a mass flow of the coolant. The second coolant partial flow and the third coolant partial flow T3 can each be in a range between 15% and 35%, preferably around 25%, of the incoming coolant flow K1, for example based on a mass flow of the coolant.

[0061] The coolant partial flows T1, T2, and T3 can reunite in a central region of the lower coolant jacket 36. The central region can, for example, be designed as an annular space surrounding the receptacle 26. The coolant flow thus combined (e.g., total coolant flow) can in turn be divided into two coolant partial flows T4 and T5.

[0062] The fourth coolant partial flow T4 flows through the fourth coolant channel 52, thereby cooling the surrounding areas. The valve land area 60 surrounding the fourth coolant channel 52 is subject to less thermal stress than the valve land areas 54, 56, 58, since the valve land area 60 only borders the two inlet channels 18, 20, which supply relatively cool combustion air to the combustion chamber 12 during operation.

[0063] The fifth coolant partial flow T5 flows upward from the central region of the lower coolant jacket 36 through the coolant chamber 62 into the upper coolant jacket 38. As it flows through the coolant chamber 62, the component arranged in the receptacle 26 can be directly or indirectly surrounded by coolant and thereby cooled. For example, the mounting sleeve 66 can be directly surrounded by coolant in order to effectively cool the component arranged in the mounting sleeve 66, for example, the fuel injector or spark plug. Thus, the still comparatively cool coolant partial flow T5 can be used to effectively cool, for example, the thermally highly stressed fuel injector.

[0064] After flowing through the coolant chamber 62, the fifth coolant partial flow T5 reaches the upper coolant jacket 38 and cools the surrounding areas. The fifth coolant partial flow T5 ultimately flows through the overflow 64 from the upper coolant jacket 38 back into the lower coolant jacket 36. There, the fourth coolant partial flow T4 and the fifth coolant partial flow T5 merge. The thus combined coolant flow (e.g., total coolant flow) K2 leaves the cylinder head 10 through the coolant outlet 30 into the coolant discharge channel 34 of the engine block 16.

[0065] The cooling requirement to be covered by the fifth coolant partial flow T5 with respect to the mounting sleeve 66 and the upper coolant jacket 38 can be greater than the cooling requirement to be covered by the fourth coolant partial flow T4 with respect to the valve web area 60. Therefore, the coolant chamber 62, the upper coolant jacket 38 and the fourth coolant channel 52 can preferably be dimensioned and arranged relative to one another such that, taking into account the pressure losses that occur, the fifth coolant partial flow T5 is greater than or at least equal to the fourth coolant partial flow T4. Preferably, the fifth coolant partial flow T5 can be in a range between 50% and 75% of the previously combined coolant flow from the coolant partial flows T1, T2 and T3, e.g., based on a mass flow of the coolant. The fourth coolant partial 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, e.g.,related to a mass flow of the coolant.

[0066] The invention is not limited to the preferred embodiments described above. Rather, a multitude of variants and modifications are possible, which also utilize the inventive concept and therefore fall within the scope of protection. In particular, the invention also claims protection for the subject matter and features of the subclaims, independent of the claims referred to. In particular, the individual features of independent claim 1 are each disclosed independently of one another.In addition, the features of the subclaims are also disclosed independently of all features of independent claim 1 and, for example, independently 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 chamber of independent claim 1. All range specifications herein are to be understood as disclosed in such a way that, as it were, all values ​​falling within the respective range are individually disclosed, e.g., also as respectively preferred narrower outer limits of the respective range. List of reference symbols

[0067] 10Cylinder head 12Combustion chamber 14Internal combustion engine 16Engine block 18First intake port 20Second intake port 22First exhaust port 24Second exhaust port 26Intake 28Coolant inlet 30Coolant outlet 32Coolant supply port 34Coolant discharge port 36Lower coolant jacket 38Upper coolant jacket 40Fire deck 42Intermediate deck 44Upper deck 46First coolant port 48Second coolant port 50Third coolant port 52Fourth coolant port 54Valve land area 56Valve land area 58Valve land area 60Valve land area 62Coolant chamber 64Crossover 66Mounting sleeve K1, K2Coolant flow T1-T5Partial coolant flow

Claims

1. A cylinder head (10) for covering a combustion chamber (12) of an internal combustion engine (14), comprising: a first and second outlet channel (22, 24) for discharging exhaust gas from the combustion chamber (12); a first and second inlet channel (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; a, preferably single, coolant inlet (28) for connection to a coolant source, a first coolant channel (46) arranged between the first and second outlet channel (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) arranged between the first outlet channel (22) and the second inlet channel (20), wherein the first, second and third coolant channel (46, 48, 50) are arranged downstream of the coolant inlet (28) and have a coolant flowable in parallel from the coolant inlet (28) therethrough; a coolant chamber (62) designed to cool the receptacle (26) and arranged downstream of the first, second and third coolant channel (46, 48, 50); an upper coolant jacket (38) arranged downstream of the coolant chamber (62); a fourth coolant channel (52) arranged between the first inlet channel (18) and the second inlet channel (20) and downstream of the first, second and third coolant channel (46, 48, 50); and a, preferably single, coolant outlet (30) arranged downstream of the upper coolant jacket (38) and the fourth coolant channel (52), 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 is arranged on a side of the cylinder head (10) opposite to the coolant inlet (28).

2. The cylinder head (10) according to claim 1, wherein: the first, second and third coolant channel (46, 48, 50) and the coolant inlet (28) are in fluid communication with each other such that a coolant flow (K1) incoming through the coolant inlet (28) is divided into three coolant partial flows (T1, T2, T3), in which a first coolant partial flow (T1) flows through the first coolant channel (46), a second coolant partial flow (T2) flows through the second coolant channel (48) and a third coolant partial flow (T3) flows through the third coolant channel (50).

3. The cylinder head (10) according to claim 2, wherein the first, second and third coolant channel (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 substantially equal in size; and / or the first coolant partial flow (T1) is in a range between 40% and 60%, preferably about 50%, of the incoming coolant flow (K1); and / or the second coolant partial flow (T2) is in a range between 15% and 35%, preferably about 25%, of the incoming coolant flow (K1); and / or the third coolant partial flow (T3) is in a range between 15% and 35%, preferably about 25%, of the incoming coolant flow (K1).

4. The cylinder head (10) according to any of the preceding claims, wherein: the first, second and third coolant channel (46, 48, 50) and the coolant chamber (62) are in fluid communication with each other such that at least part of a combined coolant flow from the first, second and third coolant channel (46, 48, 50) flows through the coolant chamber (62); and / or the coolant chamber (62) is arranged such that coolant flowing in the coolant chamber (62) flows around the receptacle (26), a mounting sleeve (66) received in the receptacle (26), a fuel injector received in the receptacle (26) or a spark plug received in the receptacle (26), preferably directly; and / or the coolant chamber (62) is annular and / or coaxially surrounds the receptacle (26).

5. The cylinder head (10) according to any 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).

6. The cylinder head (10) according to any of the preceding claims, wherein: the coolant chamber (62) and the upper coolant jacket (38) are in fluid communication with each other such that coolant flows from the first, second and third coolant channel (46, 48, 50) at least partially upwardly through the coolant chamber (62) to the upper coolant jacket (38).

7. The cylinder head (10) according to any of the preceding claims, 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 channel (52) is arranged for cooling the fire deck (40) of the cylinder head (10), the first and second inlet channel (18, 20) and valve seats of the first and second inlet channel (18, 20).

8. The cylinder head (10) according to any one of the preceding claims, wherein: the coolant chamber (62) and the fourth coolant channel (52) are in fluid communication with the first, second and third coolant channel (46, 48, 50) such that a combined coolant flow from the first, second and third coolant channel (46, 48, 50) is divided into a fourth coolant partial flow (T4) through the fourth coolant channel (52) and a fifth coolant partial flow (T5) through the coolant chamber (62).

9. The cylinder head (10) according to claim 8, wherein the fourth coolant channel (52) and the coolant chamber (62) are designed such that: the fifth coolant partial flow (T5) is greater than or substantially equal to the fourth coolant partial 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.

10. The cylinder head (10) according to any one of the preceding claims, wherein: the transition (64) from the upper coolant jacket (38) and the fourth coolant channel (52) combine adjacent to or beside 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) such that the fifth coolant partial flow (T5) from the upper coolant jacket (38) and the fourth coolant partial flow (T4) from the fourth coolant channel (52) combine and flow to the coolant outlet (30).

11. The cylinder head (10) according to any 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 outlet channel (22, 24) and of valve seats of the first and second outlet channel (22, 24); and / or the second coolant channel (48) is arranged for cooling the fire deck (40) of the cylinder head (10), the second outlet channel (24), the first inlet channel (18) and of valve seats of the second outlet channel (24) and the first inlet channel (18); and / or the third coolant channel (50) is arranged for cooling the fire deck (40) of the cylinder head (10), the first outlet channel (22), the second inlet channel (20) and of valve seats of the first outlet channel (22) and the second inlet channel (20).

12. The cylinder head (10) according to any of the preceding claims, wherein: the first, second and third coolant channel (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) comprises the first, second and third coolant channel (46); and / or the coolant chamber (62) is arranged between the lower coolant jacket (36) of the cylinder head (10) and the upper coolant jacket (38).

13. A motor vehicle, preferably utility vehicle, comprising a cylinder head (10) according to any of the preceding claims.

14. A method for cooling a cylinder head (10) according to any 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 coolant partial flow (T1); cooling a region between the second outlet channel (24) and a first inlet channel (18) of the cylinder head (10) by means of the second coolant partial flow (T2); cooling a region between the first outlet channel (22) and a second inlet channel (20) of the cylinder head (10) by means of the third coolant partial flow (T3); combining the first, second and third coolant partial flow (T1, T2, T3); dividing the combined coolant flow into a fourth coolant partial flow (T4) and a fifth coolant partial flow (T5); and cooling an area around a mounting sleeve (66), a fuel injector or a spark plug by means of the fifth coolant partial flow (T5), and thereafter cooling an upper coolant jacket (38) and / or valve guides for valves of the cylinder head (10) by means of the fifth coolant partial flow (T5); and preferably: cooling an area between the first inlet channel (18) and the second inlet channel (20) by means of the fourth coolant partial flow (T4).

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