CN210289944U - Cylinder head cooling structure, cylinder head and engine - Google Patents
Cylinder head cooling structure, cylinder head and engine Download PDFInfo
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- CN210289944U CN210289944U CN201920622392.3U CN201920622392U CN210289944U CN 210289944 U CN210289944 U CN 210289944U CN 201920622392 U CN201920622392 U CN 201920622392U CN 210289944 U CN210289944 U CN 210289944U
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Abstract
The utility model provides a cylinder head cooling structure and engine cylinder head and engine, cylinder head cooling body arrange on engine cylinder head, and still construct intake duct and exhaust passage on this engine cylinder head to installed on this engine cylinder head and be located the intake duct with spark plug between the exhaust passage, cylinder head cooling structure include and wear to locate the spark plug with cooling path between the exhaust passage, and in the exhaust passage is close to one side structure of spark plug has the indent, can constitute right the portion of dodging of cooling path dodges. Cylinder head cooling structure can effectively cool off the combustion chamber wall between exhaust passage and the spark plug, reduce the detonation phenomenon of engine.
Description
Technical Field
The utility model relates to a vehicle parts technical field, in particular to cylinder head cooling structure. The utility model discloses still relate to an engine cylinder head that uses has this cylinder head cooling structure to and install the engine of this engine cylinder head.
Background
With the improvement of environmental awareness of people, the development direction of automobile exhaust cleaning becomes a consensus of all social circles, and the main approach is to improve the thermal efficiency of an engine in order to reduce the emission of pollutants in the exhaust of the automobile. In order to improve the thermal efficiency of the engine, the technologies of supercharging, direct injection, high compression ratio, miller cycle, intercooling EGR and the like are partially adopted in the engine at present. In the application process of the technologies, the higher the compression ratio is, the more serious the engine knocking phenomenon is, and the engine knocking problem becomes an important limiting factor for continuously improving the compression ratio of the engine. One reason for the engine to knock is that the existing cylinder head water jacket structure is not reasonable, so that the wall temperature of the combustion chamber is high, and the oil-gas mixture can be ignited, so that the engine can knock.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention is directed to a cylinder head cooling structure to have a better cooling effect for an engine cylinder head.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
a cylinder head cooling structure is arranged on an engine cylinder head, an exhaust passage and an intake passage are constructed on the engine cylinder head, a spark plug is arranged on the engine cylinder head and is positioned between the exhaust passage and the intake passage, and the cylinder head cooling structure comprises a cooling passage which is arranged between the spark plug and the exhaust passage in a penetrating mode.
Further, an exhaust manifold is integrated on the engine cylinder head, and the cylinder head cooling structure further comprises a body water jacket for cooling the engine cylinder head body and a manifold water jacket for cooling the exhaust manifold; the main body water jacket and the manifold water jacket are arranged in parallel and are respectively communicated with the engine cylinder water jacket, and the cooling passage is arranged in the main body water jacket.
Further, the body water jacket includes a water jacket unit provided corresponding to each combustion chamber on the engine cylinder head; each of the water jacket units includes an exhaust side water jacket close to one side of the exhaust passage and an intake side water jacket close to one side of the intake passage and connected in series with the exhaust side water jacket.
Further, the exhaust side water jacket includes a cylinder head nose bridge area water path communicated with the cooling passage, and an exhaust valve guide cooling water path connected in series with the cylinder head nose bridge area water path.
Further, a coolant inlet port, which constitutes a coolant inflow structure of the cylinder head, communicates with the exhaust-side water jacket. Furthermore, an avoiding part which is concave in the exhaust passage and is used for avoiding the cooling passage is formed on one side of the exhaust passage, which is close to the spark plug.
Further, the distance between two points in the horizontal direction on the cross section of the cooling passage is gradually reduced from top to bottom.
Further, the ratio of the distance L1 between a horizontal line with a vertical distance of 1mm from the highest point of the cross section and two intersection points of the cross section to the distance L2 between a horizontal line with a vertical distance of 1mm from the lowest point of the cross section and two intersection points of the cross section is 1.8-2.2: 1.
compared with the prior art, the utility model discloses following advantage has:
the utility model discloses a cylinder head cooling structure sets up through the one side that is close to the spark plug at the exhaust passage and dodges the portion to can set up the cooling path between exhaust passage and spark plug, effectively cool off the combustion chamber wall between exhaust passage and the spark plug, the detonation phenomenon of reducible engine.
Another object of the present invention is to provide an engine cylinder head, in which an exhaust duct and an intake duct are constructed on the engine cylinder head, and in which a spark plug is installed on the engine cylinder head, and the spark plug is located in the exhaust duct and between the intake ducts, in which the cylinder head cooling structure is applied to the engine cylinder head as described above.
Furthermore, the utility model also provides an engine, in engine is last to be applied with as above the engine cylinder head.
The utility model discloses an engine cylinder head and engine have the same beneficial effect with foretell cylinder head cooling structure, no longer describe herein.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
fig. 1 is a schematic structural diagram of an engine cylinder head according to a first embodiment of the present invention;
fig. 2 is a plan view of a water jacket unit according to a first embodiment of the present invention;
FIG. 3 is a cross-sectional view taken at A-A of FIG. 2;
FIG. 4 is an enlarged view at B in FIG. 3;
fig. 5 is a schematic view of an avoidance structure according to a first embodiment of the present invention;
fig. 6 is an overall schematic view of an engine cooling structure according to a first embodiment of the present invention;
fig. 7 is an isometric view of the water jacket unit according to the first embodiment of the present invention;
description of reference numerals:
1-engine cylinder head, 2-inlet channel, 21-inlet main pipe, 22-inlet branch pipe, 23-inlet valve, 3-exhaust channel, 31-exhaust main pipe, 32-exhaust branch pipe, 321-avoiding part, 33-exhaust valve, 4-spark plug, 5-fuel injector, 61-cooling channel, 62-main body water jacket, 621-water jacket unit, 6211-exhaust side water jacket, 62111-nose bridge area water channel, 62112-exhaust valve guide pipe cooling water channel, 6212-inlet side water jacket, 62121-first water channel, 62122-second water channel, 62123-third water channel, 63-manifold water jacket, 64-coolant inlet, 641-, water dividing port and 642-main water inlet.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example one
The present embodiment relates to a cylinder head cooling structure that is disposed on an engine cylinder head 1, on which engine cylinder head 1 an intake passage 2 and an exhaust passage 3 are also constructed, and on which engine an ignition plug 4 is mounted, with the ignition plug 4 being located between the intake passage 2 and the exhaust passage 3, that is, the ignition plug 4 on the engine cylinder head 1 is of an overhead type. The cylinder head cooling structure has a cooling passage 61 passing through between the ignition plug 4 and the exhaust passage 3, and a concave escape portion 321 which can escape the cooling passage 61 is formed on one side of the exhaust passage 3 close to the ignition plug 4.
Specifically, the schematic illustration of the operating principle of the engine is as follows: the engine cylinder cover 1 and the engine cylinder body can enclose to form a combustion chamber, an oil injector 5 arranged on the engine cylinder cover 1 can inject oil into the combustion chamber, the air inlet channel 2 can convey air into the combustion chamber, mixed gas of the oil and the air can be ignited by the spark plug 4, and the combustion of the mixed gas in the combustion chamber can push the piston, so that the engine can do work outwards, and high-temperature waste gas generated by the combustion of the mixed gas can be discharged from the exhaust channel 3.
As shown in fig. 1, the exhaust passage 3 and the intake passage 2 are arranged oppositely on both sides of the cylinder head 1 of the engine, and the exhaust passage 3 includes an exhaust main pipe 31, and two exhaust branch pipes 32 between the exhaust main pipe 31 and the combustion chamber; the intake duct 2 includes an intake main pipe 21, and two intake branch pipes 22 between the intake main pipe 21 and the combustion chamber. And exhaust valves 33 and intake valves 23 are provided on the engine cylinder head 1, corresponding to the respective exhaust branch pipes 32 and intake branch pipes 22, respectively. The reciprocal sliding of each exhaust valve 33 on the engine cylinder head 1 may constitute communication or blocking of the corresponding exhaust branch pipe 32 with the combustion chamber, and the reciprocal sliding of each intake valve 23 on the engine cylinder head 1 may constitute communication or blocking of the corresponding intake branch pipe 22 with the combustion chamber. The above-described ignition plug 4 and injector 5 are located between the exhaust passage 3 and the intake passage 2, and the ignition plug 4 is closer to the exhaust passage 3 than the injector 5. It should be noted that the structure of the engine cylinder head 1 can refer to the prior art, and the description is only for the convenience of understanding the cylinder head cooling structure.
The inventor finds that the temperature of the wall surface of the combustion chamber between the exhaust passage 3 and the spark plug 4 is high due to the proximity of the spark plug 4 and the exhaust passage 3, and a cooling water passage is not arranged between the exhaust valve 33 and the spark plug 4 on the existing engine cylinder cover 1 due to structural limitation, so that the temperature is higher and higher as the thermal efficiency of the engine is improved for a small-displacement engine, particularly for a displacement engine below 1.5L, and even the temperature for igniting the mixed gas can be reached; the mixture is ignited elsewhere than at the ignition plug 4, which is an important cause of knocking in the engine.
In order to be able to cool the combustion chamber wall surface between the exhaust passage 3 and the ignition plug 4, in the present embodiment, as shown in fig. 2 to 4, the cylinder head cooling structure includes a cooling passage 61 that is bored between the exhaust passage 3 and the ignition plug 4, and in order to be able to realize the arrangement of this cooling passage 61, in the present embodiment, as shown in fig. 5, a concave escape portion 321 that can constitute an escape to the cooling passage 61 is configured on the side of the exhaust passage 3 near the ignition plug 4. Specifically, in the present embodiment, the escape portion 321 includes dimples configured on each exhaust branch pipe 32, and by providing each dimple, an effective cooling passage 61 can be arranged between the exhaust valve 33 and the ignition plug 4.
In order to enhance the cooling effect of the cooling passage 61, in the present embodiment, as shown in fig. 4, the distance between two points in the horizontal direction of the cross section of the cooling passage 61 is set to be gradually smaller from top to bottom. Because the width of the lower part of the section is smaller, the flow velocity of the cooling liquid at the lower part is higher than that of the cooling liquid at the upper part, and because the lower part is closer to the combustion chamber, more heat can be taken away, and the cooling effect on the wall surface of the combustion chamber can be improved. Preferably, the cross section of the cooling passage 61 is configured to: the ratio of the distance L1 between a horizontal line with the vertical distance of 1mm from the highest point of the section and two intersection points of the section to the distance L2 between a horizontal line with the vertical distance of 1mm from the lowest point of the section and two intersection points of the section is 1.8-2.2: 1. it is further preferred that the ratio of the distance L1 to the distance L2 is 2:1 for better results. According to actual measurement, by providing the cooling passage 61 and configuring the cooling passage 61 in the above-described structure, the temperature of the wall surface of the combustion chamber between the exhaust passage 3 and the ignition plug 4 can be reduced by 20 ℃ or more, which effectively improves the knocking problem of the engine.
In addition to the cooling passage 61, other positions of the cylinder head cooling structure are also improved in the present embodiment, specifically, an exhaust manifold is integrated on the engine cylinder head 1 to which the cylinder head cooling structure is applied, and as for the structure of the exhaust manifold integrated on the engine cylinder head 1, reference may be made to the prior art, and details are not repeated herein. Corresponding to the structure of the engine cylinder head 1, the cylinder head cooling structure includes a body water jacket 62 configured to cool the cylinder head body, and a manifold water jacket 63 configured to cool the exhaust manifold.
In the present embodiment, the body water jacket 62 and the manifold water jacket 63 are disposed in parallel, and in the present embodiment, the cooling fluid entering the body water jacket 62 and the manifold water jacket 63 can be provided by the cylinder water jacket or directly provided by the water pump, so that the combustion chamber and the exhaust manifold can be well cooled. Specifically, the coolant inlet 64 of the engine cooling structure includes three water inlets arranged at intervals as shown in fig. 6, and specifically includes a main water inlet 642 in the middle, and two branch water inlets 641 on both sides of the main water inlet 642, as shown by arrows in fig. 6, wherein the coolant flowing in from each of the main water inlet 642 and the branch water inlets 641 can enter the main body water jacket 62, and the coolant flowing in from the main water inlet 641 can enter the manifold water jacket 63 at the same time, thereby forming a parallel connection of the main body water jacket 62 and the manifold water jacket 63.
As shown in fig. 6, the body water jacket 62 includes a plurality of water jacket unit jackets 621 provided corresponding to the respective combustion chambers of the engine cylinder head 1, and the number of the water jacket unit jackets 621 is four in the present embodiment. As shown in fig. 2 and 7, each water jacket unit jacket 621 includes an exhaust side water jacket 6211 on the side close to the exhaust port 3 and an intake side water jacket 6212 on the side close to the intake port 2 and communicating with the exhaust side water jacket 6211, and the coolant inlet 64 described above communicates with the exhaust side water jacket 6211, and since the temperature of the exhaust port 3 is higher than that of the intake port 2, the coolant inlet 64 is set to communicate with the exhaust side water jacket 6211, so that the exhaust side of the cylinder head, which is higher in temperature, can be preferentially cooled by the coolant, which is lower in temperature, and thus a better cooling effect can be achieved.
The above-described exhaust-side water jacket 6211 includes, in addition to the above-described cooling passage 61, a head-nose-bridge-region water passage 62111 that communicates with the cooling passage 61 and that constitutes cooling of the head-nose bridge region, and an exhaust-valve-guide cooling water passage 62112 that surrounds the guide-periphery side of the exhaust valve 33 and that communicates with the head-nose-bridge-region water passage 62111. With the above arrangement, a part of the coolant flowing in through the coolant inlet 64 flows into the intake side water jacket 6212 through the bridge region water path 62111 and the exhaust valve guide cooling water path 62112, and then flows out through the water outlet communicated with the intake side water jacket 6212; the other part flows into the air inlet side water jacket 6212 through the cooling passage 61 and then flows out through the water outlet; the coolant flows through the body water jacket 62 to cool the body of the engine cylinder head 1.
As shown in fig. 2 and 7, the intake-side water jacket 6212 described above includes a first water passage 62121 communicating with the cooling passage 61 between the exhaust branch pipe 32 and the corresponding intake branch pipe 22, and a second water passage 62122 communicating with the first water passage 62121 disposed between the injector 5 and the two intake branch pipes 22, and further includes a third water passage 6212 communicating with the second water passage 62122 disposed between the two intake branch pipes 22.
With the above arrangement, as shown by the arrows in fig. 6 and 7, the coolant entering the cylinder head cooling structure through the coolant inlet port has the following paths: 1. enters the nose bridge region water path 62111 and the cooling path 61 from the main water inlet 642, flows into the air inlet side water jacket 6212 again, and is discharged through the body water jacket water discharge port connected with the air inlet side water jacket 6212; 2. enters the manifold water jacket 63 from the main water inlet 642 and is discharged through a manifold water jacket water outlet arranged at the tail end of the manifold water jacket 63; 3. flows into the exhaust-valve-guide cooling water passage 62112 through the inlet 641, flows into the intake-side water jacket 6212, and is discharged through the body water jacket discharge port connected to the intake-side water jacket 6212. Due to the above-mentioned circulation paths, the water paths flowing through the nose bridge region water path 62111, the cooling path 61 and the exhaust valve guide cooling water path 62112 are all merged at the periphery of the cylinder head exhaust passage, and the cylinder head combustion chamber is cooled together, thereby having a good cooling effect.
It should be noted that, the parts not mentioned in the above engine cooling structure can refer to the prior art, and are not described herein again.
In summary, the cylinder head cooling mechanism of the present embodiment implements the arrangement of the cooling passage 61 between the exhaust valve 33 and the ignition plug 4 by providing the escape portion 321 in the exhaust passage 3, thereby effectively reducing the temperature of the wall surface of the combustion chamber between the exhaust valve 33 and the ignition plug 4, and effectively reducing the knocking problem of the engine, particularly the small displacement engine.
Example two
The embodiment relates to an engine cylinder head, wherein an exhaust passage and an intake passage are constructed on the engine cylinder head, a spark plug is arranged on the engine cylinder head, the spark plug is positioned between the exhaust passage and the intake passage, and the cylinder head cooling structure is applied to the engine cylinder head.
The cylinder head of the engine of the embodiment can be better cooled by applying the cylinder head cooling structure of the embodiment I, and the knocking phenomenon of the engine provided with the cylinder head of the engine can be effectively reduced.
EXAMPLE III
The present embodiment relates to an engine on which the engine according to the second embodiment is mounted.
The engine of the embodiment can effectively reduce the knocking phenomenon of the engine by installing the cylinder cover 1 of the engine of the second embodiment.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A cylinder head cooling structure is arranged on an engine cylinder head (1), an exhaust passage (3) and an intake passage (2) are constructed on the engine cylinder head (1), a spark plug (4) is installed on the engine cylinder head (1), and the spark plug (4) is located between the exhaust passage (3) and the intake passage (2), and is characterized in that: the cylinder head cooling structure includes a cooling passage (61) that is provided between the ignition plug (4) and the exhaust passage (3) in a penetrating manner.
2. The cylinder head cooling structure according to claim 1, wherein: an exhaust manifold is integrated on the engine cylinder head (1), the cylinder head cooling structure further comprises a body water jacket (62) for cooling the body of the engine cylinder head (1) and a manifold water jacket (63) for cooling the exhaust manifold; the main body water jacket (62) and the manifold water jacket (63) are arranged in parallel and are respectively communicated with the engine block water jacket, and the cooling passage (61) is arranged in the main body water jacket (62).
3. The cylinder head cooling structure according to claim 2, wherein: the body water jacket (62) includes a water jacket unit (621) provided corresponding to each combustion chamber on the engine cylinder head (1); each of the water jacket units (621) includes an exhaust-side water jacket (6211) on a side close to the exhaust port (3), and an intake-side water jacket (6212) on a side close to the intake port (2) and connected in series with the exhaust-side water jacket (6211).
4. The cylinder head cooling structure according to claim 3, wherein: the exhaust-side water jacket (6211) includes a head-nose-block-region water passage (62111) that communicates with the cooling passage (61), and an exhaust-valve-guide-cooling water passage (62112) that is connected in series with the head-nose-block-region water passage (62111).
5. The cylinder head cooling structure according to claim 3, wherein: a coolant inlet (64) that constitutes a coolant inflow structure of the cylinder head communicates with the exhaust-side water jacket (6211).
6. The cylinder head cooling structure according to any one of claims 1 to 5, wherein: an avoidance part (321) which is concave in the exhaust passage (3) and avoids the cooling passage (61) is formed on one side of the exhaust passage (3) close to the spark plug (4).
7. The cylinder head cooling structure according to any one of claims 1 to 5, wherein: the distance between two points in the horizontal direction on the section of the cooling passage (61) is gradually reduced from top to bottom.
8. The cylinder head cooling structure according to claim 7, wherein: the ratio of the distance L1 between a horizontal line with the vertical distance of 1mm from the highest point of the section and two intersection points of the section to the distance L2 between a horizontal line with the vertical distance of 1mm from the lowest point of the section and two intersection points of the section is 1.8-2.2: 1.
9. an engine cylinder head, wherein an exhaust passage and an intake passage are formed in the engine cylinder head, and a spark plug is mounted on the engine cylinder head and positioned between the exhaust passage and the intake passage, characterized in that: a cylinder head cooling structure according to any one of claims 1 to 8 is provided on the engine cylinder head.
10. An engine, characterized in that: an engine cylinder head according to claim 9 mounted on the engine.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920622392.3U CN210289944U (en) | 2019-04-30 | 2019-04-30 | Cylinder head cooling structure, cylinder head and engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920622392.3U CN210289944U (en) | 2019-04-30 | 2019-04-30 | Cylinder head cooling structure, cylinder head and engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111852682A (en) * | 2020-06-04 | 2020-10-30 | 浙江义利汽车零部件有限公司 | Engine cooling water jacket system, engine cooling method and vehicle |
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- 2019-04-30 CN CN201920622392.3U patent/CN210289944U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111852682A (en) * | 2020-06-04 | 2020-10-30 | 浙江义利汽车零部件有限公司 | Engine cooling water jacket system, engine cooling method and vehicle |
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