Engine water jacket, engine and vehicle

Abstract

The utility model discloses an engine water jacket, an engine and a vehicle. The engine water jacket comprises a cylinder cover upper water jacket and a cylinder cover lower water jacket, the cylinder cover lower water jacket communicates with the cylinder cover upper water jacket through a first flow channel, a second flow channel and a third flow channel so as to supply a cooling medium to the cylinder cover upper water jacket; wherein the first flow channel, the second flow channel and the third flow channel are sequentially arranged at intervals in the length direction of the water jacket on the cylinder cover, and the sectional area of the second flow channel is larger than that of the first flow channel and that of the third flow channel. The first flow channel, the second flow channel and the third flow channel are communicated with the water jacket on the cylinder cover respectively, the sectional area of the second flow channel located in the middle is larger than that of the first flow channel and that of the third flow channel located on the two sides, cooling media flow from the middle to the two sides, and the flow direction of the cooling media in the water jacket on the cylinder cover is clearer; the flow path is shortened, the pressure loss of the water jacket is reduced, the flow uniformity of a cooling medium is improved, and the cooling effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobiles, in particular to an engine water jacket, an engine and a vehicle. Background Art

[0002] In the related art, a water jacket is provided on the engine, and the water jacket is used to cool the engine. However, in the related art, the cooling effect is uneven. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides an engine water jacket, which improves uniformity.

[0004] According to an embodiment of the utility model, the engine water jacket comprises: an upper water jacket of a cylinder head; a lower water jacket of a cylinder head, wherein the lower water jacket of the cylinder head is connected to the upper water jacket of the cylinder head through a first flow channel, a second flow channel and a third flow channel respectively, so as to supply cooling medium to the upper water jacket of the cylinder head; wherein the first flow channel, the second flow channel and the third flow channel are arranged in sequence at intervals along the length direction of the upper water jacket of the cylinder head, and the cross-sectional area of ​​the second flow channel is larger than the cross-sectional areas of the first flow channel and the third flow channel.

[0005] According to the engine water jacket of the embodiment of the utility model, the first flow channel, the second flow channel and the third flow channel are respectively connected to the water jacket on the cylinder head, and the cross-sectional area of ​​the second flow channel located in the middle position is larger than the cross-sectional areas of the first flow channel and the third flow channel on both sides. The cooling medium flows from the middle position to both sides, and the flow direction of the cooling medium in the water jacket on the cylinder head is clearer, the flow path is shortened, the pressure loss of the water jacket is reduced, the flow uniformity of the cooling medium is improved, and the cooling effect is improved.

[0006] In some embodiments, the diameter of the second flow channel is Φ, 8mm≤Φ≤12mm.

[0007] In some embodiments, the cylinder head upper water jacket is provided with a first water outlet and a second water outlet, the first water outlet is provided on a side of the first flow channel away from the second flow channel, and the second water outlet is provided on a side of the third flow channel away from the second flow channel.

[0008] In some embodiments, the engine water jacket further includes: a cylinder water jacket, the cylinder water jacket being arranged on a side of the cylinder head lower water jacket away from the cylinder head upper water jacket, the first water outlet and the second water outlet being respectively connected to the cylinder water jacket to guide the cooling medium from the cylinder head upper water jacket to the cylinder water jacket; wherein the cylinder water jacket is provided with a third water outlet to guide the cooling medium to be discharged from the engine water jacket.

[0009] In some embodiments, the cross-sectional area of ​​one of the first flow channel and the third flow channel closer to the third water outlet is S1, and the cross-sectional area of ​​the other one is S2, where S1 is smaller than S2.

[0010] In some embodiments, the cylinder head upper water jacket includes: an upper water jacket body, the upper water jacket body is respectively connected to the first flow channel, the second flow channel and the third flow channel, and in the length direction, the upper water jacket body has a first end and a second end; a first extension portion, the first extension portion is arranged at the first end, and an end of the first extension portion away from the upper water jacket body is configured as a first water outlet; a second extension portion, the second extension portion is arranged at the second end, and an end of the second extension portion away from the upper water jacket body is configured as a second water outlet.

[0011] In some embodiments, the engine water jacket further includes: an inlet water jacket, which is located on one side of the cylinder head lower water jacket in the width direction of the engine water jacket and is connected to the cylinder head lower water jacket to guide the cooling medium from the inlet water jacket to the cylinder head lower water jacket; wherein the inlet water jacket is provided with a water inlet, which is used to guide the cooling medium to flow from outside the engine water jacket to the inlet water jacket, and the water inlet is provided at one end of the inlet water jacket close to the third water outlet.

[0012] In some embodiments, the water entry jacket has a first side, a second side, a third side and a fourth side, the first side and the second side are opposite sides of the water entry jacket, the first side and the second side are spaced apart along the length direction, the first side is closer to the third water outlet than the second side, the third side and the fourth side are arranged between the first side and the second side, the third side is closer to the water jacket under the cylinder head than the fourth side, and in the direction from the first side to the second side, the distance between the fourth side and the third side at least partially gradually decreases.

[0013] According to the engine of the embodiment of the utility model, an engine water jacket is provided in the engine, and the engine water jacket is the above-mentioned engine water jacket.

[0014] According to the engine of the embodiment of the utility model, the first flow channel, the second flow channel and the third flow channel are respectively connected to the water jacket on the cylinder head, and the cross-sectional area of ​​the second flow channel located in the middle position is larger than the cross-sectional areas of the first flow channel and the third flow channel on both sides. The cooling medium flows from the middle position to both sides, and the flow direction of the cooling medium in the water jacket on the cylinder head is clearer, the flow path is shortened, the pressure loss of the water jacket is reduced, the flow uniformity of the cooling medium is improved, and the cooling effect is improved.

[0015] A vehicle according to an embodiment of the utility model includes the above-mentioned engine.

[0016] According to the vehicle of the embodiment of the utility model, the first flow channel, the second flow channel and the third flow channel are respectively connected to the water jacket on the cylinder head, and the cross-sectional area of ​​the second flow channel located in the middle position is larger than the cross-sectional areas of the first flow channel and the third flow channel on both sides. The cooling medium flows from the middle position to both sides, and the flow direction of the cooling medium in the water jacket on the cylinder head is clearer, the flow path is shortened, the pressure loss of the water jacket is reduced, the flow uniformity of the cooling medium is improved, and the cooling effect is improved.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 Schematic diagram of the engine water jacket in the embodiment of the utility model Figure 1 ;

[0020] Figure 2 Schematic diagram of the engine water jacket in the embodiment of the utility model Figure 2 ;

[0021] Figure 3 Schematic diagram of the engine water jacket in the embodiment of the utility model Figure 3 ;

[0022] Figure 4 It is a top view of the engine water jacket in the embodiment of the utility model.

[0023] Reference numerals:

[0024] 100. Engine water jacket;

[0025] 10. Cylinder head water jacket; 11. First water outlet; 12. Second water outlet; 13. Upper water jacket body; 131. First end; 132. Second end; 14. First extension; 15. Second extension;

[0026] 20. Cylinder head lower water jacket; 21. First flow channel; 22. Second flow channel; 23. Third flow channel;

[0027] 30. Cylinder water jacket; 31. Third water outlet; 40. Entering water jacket; 41. Water inlet; 42. First side; 43. Second side; 44. Third side; 45. Fourth side. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Unless otherwise specified, the front-to-back direction in this application is the longitudinal direction of the vehicle, that is, the X direction; the left-right direction is the lateral direction of the vehicle, that is, the Y direction; and the up-down direction is the vertical direction of the vehicle, that is, the Z direction.

[0032] Reference below Figure 1-Figure 4 An engine water jacket 100 according to an embodiment of the present invention is described.

[0033] Reference Figure 1 According to an embodiment of the utility model, an engine water jacket 100 includes: a cylinder head upper water jacket 10 and a cylinder head lower water jacket 20.

[0034] The cylinder head lower water jacket 20 is connected to the cylinder head upper water jacket 10 through the first flow channel 21, the second flow channel 22 and the third flow channel 23 respectively, so as to supply cooling medium to the cylinder head upper water jacket 10. The first flow channel 21, the second flow channel 22 and the third flow channel 23 are sequentially arranged at intervals along the length direction of the cylinder head upper water jacket 10, and the cross-sectional area of ​​the second flow channel 22 is larger than the cross-sectional areas of the first flow channel 21 and the third flow channel 23.

[0035] The engine water jacket 100 is a cavity structure in the engine, and the cooling medium flows in the water jacket. The cooling medium can be cooling water or a mixture of antifreeze added to cooling water to reduce the temperature of the engine. The cooling medium flows from the cylinder head lower water jacket 20 to the cylinder head upper water jacket 10 through multiple flow channels, wherein the second flow channel 22 is located between the first flow channel 21 and the third flow channel 23. Compared with the first flow channel 21 and the third flow channel 23, the cross-sectional area of ​​the second flow channel 22 is the largest. The cooling medium flowing out of the second flow channel 22 flows in both directions. The cross-sectional area of ​​the first flow channel 21 is smaller than that of the second flow channel 22. The cooling medium flowing out of the first flow channel 21 flows in a direction away from the second flow channel 22. The cross-sectional area of ​​the third flow channel 23 is smaller than that of the second flow channel 22. The cooling medium flowing out of the third flow channel 23 flows in a direction away from the second flow channel 22. The flow direction of the cooling medium in the cylinder head upper water jacket 10 is clearer.

[0036] In the related art, a water jacket is provided on the engine, and the water jacket is used to cool the engine. However, in the related art, the cooling effect is uneven.

[0037] Specifically, in the related art, in the water jacket on the cylinder head, the cooling medium flows from one end to the opposite other end, and the cooling effect of the cooling medium on the other end is poor.

[0038] In the embodiment of the utility model, the first flow channel 21, the second flow channel 22 and the third flow channel 23 are respectively connected to the cylinder head water jacket 10, and the cross-sectional area of ​​the second flow channel 22 located in the middle position is larger than the cross-sectional areas of the first flow channel 21 and the third flow channel 23 on both sides. In the water jacket 10 on the cylinder head, the cooling medium flows from the middle part to both sides. Compared with the overall longitudinal flow type of the related technology, the embodiment of the utility model is adjusted to a partitioned flow type. The flow direction of the cooling medium in the water jacket 10 on the cylinder head is clearer, the flow path is shortened, the water jacket pressure loss is reduced, the flow uniformity of the cooling medium is improved, and the cooling effect is improved.

[0039] For example, the longitudinal direction is the left-right direction, and the first flow channel 21 , the second flow channel 22 , and the third flow channel 23 are sequentially arranged in the left-right direction.

[0040] According to the engine water jacket 100 of the embodiment of the utility model, the first flow channel 21, the second flow channel 22 and the third flow channel 23 are respectively connected to the cylinder head water jacket 10, and the cross-sectional area of ​​the second flow channel 22 located in the middle position is larger than the cross-sectional areas of the first flow channel 21 and the third flow channel 23 on both sides. The cooling medium flows from the middle position to both sides, and the flow direction of the cooling medium in the cylinder head water jacket 10 is clearer, the flow path is shortened, the water jacket pressure loss is reduced, the flow uniformity of the cooling medium is improved, and the cooling effect is improved.

[0041] In some embodiments, the diameter of the second flow channel 22 is Φ, 8 mm ≤ Φ ≤ 12 mm.

[0042] The cross-section of the second flow channel 22 is circular, and the diameter of the circle is Φ, which can be 8 mm, 9 mm, 10 mm, 11 mm, or 12 mm.

[0043] Specifically, the engine is a 2.0L four-cylinder engine, and the diameter of the second flow passage 22 is Φ, 8mm≤Φ≤12mm.

[0044] In the above scheme, by setting the diameter Φ of the second flow channel 22 within the range of 8 to 12 mm, the size of the second flow channel 22 is controlled, so that under a certain pressure, the flow rate of the cooling medium flowing out of the second flow channel 22 is larger, thereby improving the cooling effect.

[0045] Reference Figure 1 In some embodiments, the cylinder head water jacket 10 is provided with a first water outlet 11 and a second water outlet 12. The first water outlet 11 is provided on a side of the first flow channel 21 away from the second flow channel 22, and the second water outlet 12 is provided on a side of the third flow channel 23 away from the second flow channel 22.

[0046] In the above scheme, by arranging the first water outlet 11 on the side of the first flow channel 21 away from the second flow channel 22, and arranging the second water outlet 12 on the side of the third flow channel 23 away from the second flow channel 22, the cooling medium in the cylinder head water jacket 10 flows out of the cylinder head water jacket 10 from the first water outlet 11 and the second water outlet 12. In the cylinder head water jacket 10, the flow direction of the cooling medium is: from the second flow channel 22 to the opposite sides, one side passes through the first flow channel 21 and is discharged from the cylinder head water jacket 10 from the first water outlet 11, and the other side passes through the third flow channel 23 and is discharged from the cylinder head water jacket 10 from the second water outlet 12. The overall flow direction is clearer and the uniformity is improved.

[0047] Reference Figure 1In some embodiments, the engine water jacket 100 further includes: a cylinder water jacket 30, which is disposed on the side of the cylinder head lower water jacket 20 away from the cylinder head upper water jacket 10, and the first water outlet 11 and the second water outlet 12 are respectively connected to the cylinder water jacket 30 to guide the cooling medium from the cylinder head upper water jacket 10 to the cylinder water jacket 30. The cylinder water jacket 30 is provided with a third water outlet 31 to guide the cooling medium to be discharged from the engine water jacket 100.

[0048] In the above scheme, the first water outlet 11 and the second water outlet 12 are respectively connected to the cylinder water jacket 30, so that the cooling medium in the water jacket 10 on the cylinder head is guided to the cylinder water jacket 30, and the third water outlet 31 on the cylinder water jacket 30 guides the cooling medium to be discharged outside the engine water jacket 100, so that the overall flow direction of the cooling medium is orderly, thereby improving the cooling effect.

[0049] Specifically, the cylinder water jacket 30 is arranged below the cylinder head lower water jacket 20, and the cylinder head lower water jacket 20 is located between the cylinder head upper water jacket 10 and the cylinder water jacket 30. The cooling medium in the cylinder head upper water jacket 10 flows to the cylinder water jacket 30, and finally discharges the engine water jacket 100 from the third water outlet 31.

[0050] In some embodiments, the cross-sectional area of ​​one of the first flow channel 21 and the third flow channel 23 closer to the third water outlet 31 is S1, and the cross-sectional area of ​​the other is S2, where S1 is smaller than S2.

[0051] Among them, when the first flow channel 21 is closer to the third water outlet 31 than the third flow channel 23, the cross-sectional area of ​​the first flow channel 21 is S1, and the cross-sectional area of ​​the third flow channel 23 is S2; when the third flow channel 23 is closer to the third water outlet 31 than the first flow channel 21, the cross-sectional area of ​​the third flow channel 23 is S1, and the cross-sectional area of ​​the first flow channel 21 is S2.

[0052] It can be understood that when the first flow channel 21 is closer to the third water outlet 31 than the third flow channel 23, it is disturbed by the third water outlet 31, the pressure difference at both ends of the first flow channel 21 is large, and the pressure difference at both ends of the third flow channel 23 is small; when the third flow channel 23 is closer to the third water outlet 31 than the first flow channel 21, it is disturbed by the third water outlet 31, the pressure difference at both ends of the third flow channel 23 is large, and the pressure difference at both ends of the first flow channel 21 is small.

[0053] In the above solution, by setting S1 smaller than S2, the cross-sectional area of ​​the flow channel away from the third water outlet 31 is smaller, so that the flow rates of the first flow channel 21 and the third flow channel 23 are close to or consistent, thereby improving the uniformity at all locations.

[0054] Specifically, the cross-sectional area of ​​the first flow channel 21 and the cross-sectional area of ​​the second flow channel 22 can be calculated by the Bernoulli equation according to the pressure difference on both sides, and the cross-sectional area of ​​the first flow channel 21 / the cross-sectional area of ​​the first flow channel 21 is: ΔP1 is the pressure difference between the two sides of the first flow channel 21 , and ΔP2 is the pressure difference between the two sides of the second flow channel 22 .

[0055] Reference Figure 2 In some embodiments, the cylinder head upper water jacket 10 includes: an upper water jacket body 13 , a first extending portion 14 and a second extending portion 15 .

[0056] The upper water jacket body 13 is connected to the first flow channel 21, the second flow channel 22 and the third flow channel 23 respectively. In the length direction, the upper water jacket body 13 has a first end 131 and a second end 132. The first extension portion 14 is provided at the first end 131, and the end of the first extension portion 14 away from the upper water jacket body 13 is configured as the first water outlet 11. The second extension portion 15 is provided at the second end 132, and the end of the second extension portion 15 away from the upper water jacket body 13 is configured as the second water outlet 12.

[0057] Among them, the first extension portion 14 and the second extension portion 15 are respectively arranged at the opposite ends of the water jacket body. The end of the first extension portion 14 away from the upper water jacket body 13 is configured as a first water outlet 11, and the first water outlet 11 is connected to the cylinder water jacket 30. The end of the second extension portion 15 away from the upper water jacket body 13 is configured as a second water outlet 12, and the second water outlet 12 is connected to the cylinder water jacket 30.

[0058] In the above scheme, by setting the relative first extension part 14 and the second extension part 15, in the water jacket 10 on the cylinder head, the cooling medium flows from the middle to the opposite sides and flows all the way to the end. The flow direction of the cooling medium in the water jacket 10 on the cylinder head is clear, thereby improving the cooling effect.

[0059] Reference Figure 2 , Figure 3 and Figure 4 In some embodiments, the engine water jacket 100 further includes: an inlet water jacket 40, which is located at one side of the cylinder head lower water jacket 20 in the width direction of the engine water jacket 100 and is connected to the cylinder head lower water jacket 20 to guide the cooling medium from the inlet water jacket 40 to the cylinder head lower water jacket 20. The inlet water jacket 40 is provided with a water inlet 41, which is used to guide the cooling medium to flow from the outside of the engine water jacket 100 to the inlet water jacket 40, and the water inlet 41 is provided at one end of the inlet water jacket 40 close to the third water outlet 31.

[0060] Among them, the cooling medium enters into the engine water jacket 100 through the water inlet 41, and the water jacket 40 is connected to the cylinder head lower water jacket 20, and the cooling medium flows from the water jacket 40 to the cylinder head lower water jacket 20, that is, the water inlet 41 is the total water inlet of the engine water jacket 100, and the third water outlet 31 is the total water outlet of the engine water jacket 100, and the total water inlet and the total water outlet are close to each other.

[0061] In the above solution, by arranging the water inlet 41 at one end of the water jacket 40 close to the third water outlet 31, the total water inlet and the total water outlet on the engine water jacket 100 are close to each other, which facilitates the management of water inlet and outlet of the engine.

[0062] Reference Figure 2 In some embodiments, the water entry jacket 40 has a first side 42, a second side 43, a third side 44 and a fourth side 45. The first side 42 and the second side 43 are opposite sides of the water entry jacket 40. The first side 42 and the second side 43 are spaced apart along the length direction. The first side 42 is closer to the third water outlet 31 than the second side 43. The third side 44 and the fourth side 45 are arranged between the first side 42 and the second side 43. The third side 44 is closer to the cylinder head lower water jacket 20 than the fourth side 45. In the direction from the first side 42 to the second side 43, the distance between the fourth side 45 and the third side 44 is at least partially gradually reduced.

[0063] Among them, the first side 42, the second side 43, the third side 44 and the fourth side 45 are four side surfaces entering the water jacket 40, the first side 42 and the second side 43 are two opposite side surfaces entering the water jacket 40, the third side 44 and the fourth side 45 are two opposite side surfaces entering the water jacket 40, and the water inlet 41 is arranged at one end where the first side 42 is located, and in the direction away from the water inlet 41, the distance between the fourth side 45 and the third side 44 at least partially gradually decreases.

[0064] The distance between the fourth side 45 and the third side 44 may be gradually reduced, or may be partially gradually reduced.

[0065] In the above scheme, by setting the distance between the fourth side 45 and the third side 44 to at least partially gradually decrease, the cooling medium introduced by the water inlet 41 can flow evenly to the water jacket 20 under the cylinder head, making the cooling medium in each part more uniform, thereby improving the cooling effect.

[0066] Specifically, the water inlet 41 is arranged on the left side, and the height of the part entering the water jacket 40 gradually decreases from left to right. The third side 44 is connected to the water jacket 20 under the cylinder head. On the longer third side 44, the cooling medium of each part is relatively uniform.

[0067] According to the engine of the embodiment of the utility model, an engine water jacket 100 is provided in the engine, and the engine water jacket 100 is the above-mentioned engine water jacket 100 .

[0068] According to the engine of the embodiment of the utility model, the first flow channel 21, the second flow channel 22 and the third flow channel 23 are respectively connected to the water jacket 10 on the cylinder head, and the cross-sectional area of ​​the second flow channel 22 located in the middle position is larger than the cross-sectional areas of the first flow channel 21 and the third flow channel 23 on both sides. The cooling medium flows from the middle position to both sides, and the flow direction of the cooling medium in the water jacket 10 on the cylinder head is clearer, the flow path is shortened, the pressure loss of the water jacket is reduced, the flow uniformity of the cooling medium is improved, and the cooling effect is improved.

[0069] A vehicle according to an embodiment of the utility model includes the above-mentioned engine.

[0070] According to the vehicle of the embodiment of the utility model, the first flow channel 21, the second flow channel 22 and the third flow channel 23 are respectively connected to the water jacket 10 on the cylinder head, and the cross-sectional area of ​​the second flow channel 22 located in the middle position is larger than the cross-sectional areas of the first flow channel 21 and the third flow channel 23 on both sides. The cooling medium flows from the middle part to both sides, and the flow direction of the cooling medium in the water jacket 10 on the cylinder head is clearer, the flow path is shortened, the pressure loss of the water jacket is reduced, the flow uniformity of the cooling medium is improved, and the cooling effect is improved.

[0071] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0072] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An engine water jacket, characterized in that: include: Cylinder head upper water jacket (10); A cylinder head lower water jacket (20), wherein the cylinder head lower water jacket (20) is connected to the cylinder head upper water jacket (10) through a first flow channel (21), a second flow channel (22) and a third flow channel (23) respectively, so as to supply cooling medium to the cylinder head upper water jacket (10); wherein, The first flow channel (21), the second flow channel (22) and the third flow channel (23) are arranged in sequence and spaced apart along the length direction of the cylinder head upper water jacket (10); the cross-sectional area of ​​the second flow channel (22) is larger than the cross-sectional areas of the first flow channel (21) and the third flow channel (23).

2. The engine water jacket according to claim 1, characterized in that: The diameter of the second flow channel (22) is Φ, 8mm≤Φ≤12mm.

3. The engine water jacket according to claim 1, characterized in that: The cylinder head upper water jacket (10) is provided with a first water outlet (11) and a second water outlet (12); the first water outlet (11) is provided on a side of the first flow channel (21) away from the second flow channel (22); and the second water outlet (12) is provided on a side of the third flow channel (23) away from the second flow channel (22).

4. The engine water jacket according to claim 3, characterized in that: Also includes: A cylinder water jacket (30), wherein the cylinder water jacket (30) is arranged on a side of the cylinder head lower water jacket (20) away from the cylinder head upper water jacket (10), and the first water outlet (11) and the second water outlet (12) are respectively connected to the cylinder water jacket (30) to guide the cooling medium to flow from the cylinder head upper water jacket (10) to the cylinder water jacket (30); wherein: The cylinder water jacket (30) is provided with a third water outlet (31) to guide the cooling medium to be discharged from the engine water jacket (100).

5. The engine water jacket according to claim 4, characterized in that: The cross-sectional area of ​​the one of the first flow channel (21) and the third flow channel (23) closer to the third water outlet (31) is S1, and the cross-sectional area of ​​the other one is S2, and S1 is smaller than S2.

6. The engine water jacket according to claim 4, characterized in that: The cylinder head upper water jacket (10) comprises: an upper water jacket body (13), the upper water jacket body (13) being connected to the first flow channel (21), the second flow channel (22) and the third flow channel (23) respectively, and in the length direction, the upper water jacket body (13) having a first end (131) and a second end (132); A first extension portion (14), the first extension portion (14) being arranged at the first end (131), and an end of the first extension portion (14) away from the upper water jacket body (13) being configured as a first water outlet (11); A second extension portion (15), wherein the second extension portion (15) is arranged at the second end (132), and an end of the second extension portion (15) away from the upper water jacket body (13) is configured as a second water outlet (12).

7. The engine water jacket according to claim 4, characterized in that: Also includes: An inlet water jacket (40) is located on one side of the cylinder head lower water jacket (20) in the width direction of the engine water jacket (100) and is connected to the cylinder head lower water jacket (20) to guide the cooling medium to flow from the inlet water jacket (40) to the cylinder head lower water jacket (20); wherein, The water inlet jacket (40) is provided with a water inlet (41), and the water inlet (41) is used to guide the cooling medium to flow from outside the engine water jacket (100) to the water inlet jacket (40). The water inlet (41) is provided at one end of the water inlet jacket (40) close to the third water outlet (31).

8. The engine water jacket according to claim 7, characterized in that: The water inlet jacket (40) comprises a first side (42), a second side (43), a third side (44) and a fourth side (45); the first side (42) and the second side (43) are opposite sides of the water inlet jacket (40); the first side (42) and the second side (43) are arranged at intervals along the length direction; the first side (42) is closer to the third water outlet (31) than the second side (43); the third side (44) and the fourth side (45) are arranged between the first side (42) and the second side (43); the third side (44) is closer to the cylinder head lower water jacket (20) than the fourth side (45); and in the direction from the first side (42) to the second side (43), the distance between the fourth side (45) and the third side (44) at least partially gradually decreases.

9. An engine, characterized in that: An engine water jacket (100) is provided in the engine, and the engine water jacket (100) is the engine water jacket (100) according to any one of claims 1 to 8.

10. A vehicle, characterized in that: Comprising the engine as claimed in claim 9.

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