阅读说明：本技术 一种气缸盖、气缸盖冷却系统、发动机及气缸盖冷却方法 (Cylinder head, cylinder head cooling system, engine and cylinder head cooling method ) 是由 吴世友 孟庆宇 牛放 金喆 王宇 于 2021-09-26 设计创作，主要内容包括：本发明属于发动机气缸盖技术领域,公开了一种气缸盖、气缸盖冷却系统、发动机及气缸盖冷却方法,该气缸盖包括气缸盖本体和隔板,气缸盖本体内设置有冷却水腔,隔板固定设置于冷却水腔内,隔板将冷却水腔由上而下分为上层水腔和下层水腔,隔板上设置有连通孔,连通孔连通上层水腔和下层水腔,气缸盖本体设置有进气侧壁和排气侧壁,进气侧壁设置有进水口,进水口与上层水腔连通,且进水口位于上层水腔的下方,排气侧壁设置有出水口,出水口与下层水腔连通,且出水口位于下层水腔的上方。该气缸盖能够在冷却液排出时,既带走上层水腔的气泡,又带走下层水腔的气泡,增强对气缸盖的冷却效果,提高气缸盖的可靠性。(The invention belongs to the technical field of engine cylinder heads, and discloses a cylinder head, a cylinder head cooling system, an engine and a cylinder head cooling method. When the cooling liquid is discharged, the air bubbles of the upper-layer water cavity and the air bubbles of the lower-layer water cavity are taken away, the cooling effect on the air cylinder cover is enhanced, and the reliability of the air cylinder cover is improved.)

1. A cylinder head, comprising:

the cylinder cover comprises a cylinder cover body, wherein a cooling water cavity is arranged in the cylinder cover body;

the partition plate (3) is fixedly arranged in the cooling water cavity, the cooling water cavity is divided into an upper-layer water cavity (1) and a lower-layer water cavity (2) by the partition plate (3) from top to bottom, a communication hole (4) is formed in the partition plate (3), and the communication hole (4) is communicated with the upper-layer water cavity (1) and the lower-layer water cavity (2);

the cylinder head body is provided with an air inlet side wall (5) and an exhaust side wall (6), the air inlet side wall (5) is provided with a water inlet (7), the water inlet (7) is communicated with the upper water cavity (1), the water inlet (7) is located below the upper water cavity (1), the exhaust side wall (6) is provided with a water outlet (8), the water outlet (8) is communicated with the lower water cavity (2), and the water outlet (8) is located above the lower water cavity (2).

2. The cylinder head according to claim 1, characterized in that the cylinder head body is provided with a bottom plate provided with two intake ports (9) and two exhaust ports (10), the center lines of the two intake ports (9) and the two exhaust ports (10) being arranged in a rectangular shape, a row nose bridge region (12) being formed between the two exhaust ports (10), the partition plate (3) being provided with a reinforcement hole (18), the reinforcement hole (18) being provided at a position facing the row nose bridge region (12).

3. A cylinder head according to claim 2, wherein the bottom plate is provided with an injector mounting hole (11), and the two intake ports (9) and the two exhaust ports (10) are provided at intervals around the circumference of the injector mounting hole (11), the cylinder head further comprising an injector bush that is fixedly provided in the injector mounting hole (11), the injector bush being located in the communication hole (4).

4. The cylinder head according to claim 1, characterized in that the cylinder head body is provided with two exhaust valve guide connecting portions (17) and two intake valve guide connecting portions (16), both the exhaust valve guide connecting portions (17) and both the intake valve guide connecting portions (16) being located in the upper water chamber (1), the cylinder head further comprising a water blocking ring (19), the water blocking ring (19) being fixedly provided in the upper water chamber (1) and being capable of preventing cooling water from flowing out from the water inlet (7) and directly flowing into the communication hole (4) from between the two intake valve guide connecting portions (16) without passing through the two exhaust valve guide connecting portions (17).

5. A cylinder head according to claim 1, characterized in that the partition (3) is fixedly connected at both ends thereof to the intake side wall (5) and the exhaust side wall (6), respectively.

6. A cylinder head according to claim 1, characterized in that it is provided with a plurality of cylinders, said intake side wall (5) being provided with one said water inlet (7) for each of said cylinders, and said exhaust side wall (6) being provided with one said water outlet (8) for each of said two cylinders.

7. A cylinder head cooling system, characterized by comprising the cylinder head according to any one of claims 1 to 6.

8. The cylinder head cooling system according to claim 7, further comprising a water intake assembly connected to the water inlet (7) and a water outlet assembly connected to the water outlet (8), the water intake assembly being configured to supply cooling water to the cylinder head, and the water outlet assembly being configured to collect the cooling water flowing out of the cylinder head.

9. An engine comprising the cylinder head cooling system of claim 7 or 8.

10. A cylinder head cooling method characterized by employing the cylinder head cooling system according to claim 8, comprising:

the cooling water enters the water inlet (7) from the water inlet assembly;

the cooling water flows from the water inlet (7) to the upper water cavity (1) from bottom to top;

the cylinder head body is provided with two exhaust valve guide connecting parts (17) and two intake valve guide connecting parts (16), the cooling water flows in the upper water cavity (1) along the anticlockwise direction, sequentially flows through one of the intake valve guide connecting parts (16), the two exhaust valve guide connecting parts (17) and the other intake valve guide connecting part (16), and is collected between the two exhaust valve guide connecting parts (17) and the two intake valve guide connecting parts (16) to flow into the communicating hole (4);

the cylinder cover body is provided with a bottom plate, the bottom plate is provided with two air inlets (9) and two air outlets (10), the cooling water flows into the lower-layer water cavity (2) from the communicating hole (4), flows through the areas between the two air outlets (10) and the two air inlets (9), is collected, and flows from bottom to top to enter the water outlet (8);

the cooling water enters the water outlet assembly from the water outlet (8).

Technical Field

The invention relates to the technical field of engine cylinder heads, in particular to a cylinder head, a cylinder head cooling system, an engine and a cylinder head cooling method.

Background

The engine cylinder cover mainly has the functions of sealing fuel gas in the cylinder, introducing fresh air into the cylinder and discharging high-temperature fuel gas out of the cylinder. In order to reduce the thermal load, a cooling water chamber is generally provided in the cylinder head, and cooling water flows through the cooling water chamber to cool the cylinder head. The cooling water cavity of the engine cylinder cover is generally designed into an upper layer and a lower layer, and the cooling water cavity is divided into an upper-layer water cavity and a lower-layer water cavity by arranging a partition plate in the cooling water cavity.

There are two cooling modes at present; the first is that the cooling water passes through the lower water cavity and then passes through the upper water cavity, and the second is that the cooling water passes through the upper water cavity and then passes through the lower water cavity. When the first mode is adopted, the lower water cavity is communicated with the water inlet, the upper water cavity is communicated with the water outlet, cooling water enters the lower water cavity from the water inlet, flows through the communication hole in the partition plate after flowing through the nose bridge area of the cylinder cover (namely, the area between the adjacent valves), and flows out of the cylinder cover through the upper water cavity flowing in through the communication hole. By adopting the mode, because the cooling water flows from bottom to top, the flow rate of the cooling water is relatively low, the cooling efficiency is low, and the cooling effect is poor. When the second mode is adopted, the lower water cavity is communicated with the water outlet, the upper water cavity is communicated with the water inlet, cooling water flows from the upper water cavity to the lower water cavity through the communicating hole, the flow rate is high, the cooling effect is good, however, in the cylinder cover structure adopting the second mode at present, the water outlet is arranged on the bottom plate of the cylinder cover, the water outlet is positioned below the lower water cavity, and the flow trend of bubbles in the cooling liquid is always from bottom to top, so that the bubbles in the cooling liquid can not be taken away when the cooling liquid is discharged, when the bubbles are gathered to a certain degree on the wall surface of the cylinder cover, the bubbles occupy the volume of the lower water cavity, so that the cooling liquid in the lower water cavity is reduced, the temperature of the cooling liquid in the lower water jacket is increased to generate boiling, the heat dissipation efficiency of the cooling liquid is reduced, the temperature of the bottom plate of the engine is increased, when the temperature is increased to a certain degree, the bottom plate of the cylinder cover is cracked, affecting the reliability of the cylinder head.

Disclosure of Invention

The invention aims to provide a cylinder head, a cylinder head cooling system, an engine and a cylinder head cooling method, which aim to solve the problems.

In order to achieve the purpose, the invention adopts the following technical scheme:

a cylinder head, comprising:

the cylinder cover comprises a cylinder cover body, wherein a cooling water cavity is arranged in the cylinder cover body;

the partition plate is fixedly arranged in the cooling water cavity, the cooling water cavity is divided into an upper-layer water cavity and a lower-layer water cavity from top to bottom by the partition plate, and a communication hole is formed in the partition plate and is communicated with the upper-layer water cavity and the lower-layer water cavity;

the cylinder head body is provided with an air inlet side wall and an air outlet side wall, the air inlet side wall is provided with a water inlet, the water inlet is communicated with the upper water cavity, the water inlet is located below the upper water cavity, the air outlet side wall is provided with a water outlet, the water outlet is communicated with the lower water cavity, and the water outlet is located above the lower water cavity.

Preferably, the cylinder cover body is provided with a bottom plate, the bottom plate is provided with two air inlets and two air outlets, the central lines of the two air inlets and the two air outlets are arranged in a rectangular shape, a row of nose bridge areas are formed between the two air outlets, the partition plate is provided with reinforcing holes, and the reinforcing holes are arranged at positions right opposite to the row of nose bridge areas.

Preferably, the bottom plate is provided with an injector mounting hole, the two air inlets and the two exhaust ports are arranged around the circumference of the injector mounting hole at intervals, the cylinder head further comprises an injector bushing, the injector bushing is fixedly arranged in the injector mounting hole, and the injector bushing is located in the communicating hole.

Preferably, the cylinder head body is provided with two exhaust valve guide pipe connecting parts and two intake valve guide pipe connecting parts, two exhaust valve guide pipe connecting parts and two intake valve guide pipe connecting parts are located in the upper water cavity, the cylinder head further comprises a water blocking ring, the water blocking ring is fixedly arranged in the upper water cavity, and can prevent cooling water from flowing out of the water inlet and then directly flowing into the communicating hole between the two exhaust valve guide pipe connecting parts and the two intake valve guide pipe connecting parts.

Preferably, both ends of the partition plate are respectively and fixedly connected with the air inlet side wall and the air outlet side wall.

Preferably, the cylinder cover is arranged on a plurality of cylinders, the air inlet side wall is provided with one water inlet corresponding to each cylinder, and the air outlet side wall is provided with one water outlet corresponding to each two cylinders.

A cylinder head cooling system comprises the cylinder head.

Preferably, the cylinder head cooling device further comprises a water inlet assembly and a water outlet assembly, the water inlet assembly is connected with the water inlet, the water outlet assembly is connected with the water outlet, the water inlet assembly is used for providing cooling water for the cylinder head, and the water outlet assembly is used for collecting the cooling water flowing out of the cylinder head.

An engine comprises the cylinder head cooling system.

A cylinder head cooling method adopts the cylinder head cooling system, and comprises the following steps:

the cooling water enters the water inlet from the water inlet assembly;

the cooling water flows from the water inlet to the upper water cavity from bottom to top;

the cylinder cover body is provided with two exhaust valve guide connecting parts and two intake valve guide connecting parts, the cooling water flows anticlockwise in the upper water cavity, sequentially flows through one of the intake valve guide connecting parts, the two exhaust valve guide connecting parts and the other intake valve guide connecting part, and is collected between the two exhaust valve guide connecting parts and the two intake valve guide connecting parts to flow into a communicating hole;

the cylinder cover body is provided with a bottom plate, the bottom plate is provided with two air inlets and two air outlets, the cooling water flows into the lower-layer water cavity from the communicating hole, flows through the areas between the two air outlets and the two air inlets, is collected, and flows from bottom to top to enter the water outlet;

and the cooling water enters the water outlet assembly from the water outlet.

The invention has the beneficial effects that: the invention provides a cylinder cover, a cylinder cover cooling system, an engine and a cylinder cover cooling method. When the cylinder cover is cooled, cooling water enters the upper-layer water cavity from the water inlet, flows into the lower-layer water cavity through the communication hole and finally flows out from the water outlet. The cooling water flows to the lower water cavity from the upper water cavity, and under the action of self gravity, the flow speed is faster, the impact force is large, so that the cooling effect on the cylinder cover is better. And the flowing trend of bubbles in the cooling water is always from bottom to top, because the water inlet is arranged at the position below the upper-layer water cavity, the cooling water also flows from bottom to top when entering the upper-layer water cavity from the water inlet, and the flowing direction of the cooling water is consistent with the flowing direction of the bubbles, so that the bubbles can be driven to flow, the bubbles can be taken away, and the bubbles are prevented from being gathered on the wall surface of the upper-layer water cavity. Because the water outlet is arranged at the position above the lower-layer water cavity, the flow direction of the cooling water flowing into the water outlet from the lower-layer water cavity is consistent with the flow direction of the bubbles from bottom to top, so that the cooling water can take away the bubbles in the lower-layer water cavity, the bubbles are prevented from being gathered on the wall surface or the partition plate, the cooling effect on the cylinder cover can be enhanced, and the reliability of the cylinder cover is improved.

Drawings

FIG. 1 is a cross-sectional schematic view of a cylinder head provided in accordance with an embodiment of the present invention;

FIG. 2 is a schematic illustration of cooling water flow within the cylinder head provided by an exemplary embodiment of the present invention;

FIG. 3 is a schematic diagram of the distribution of water inlet locations of a cylinder head provided by an embodiment of the present invention;

FIG. 4 is a schematic diagram of the distribution of water outlet locations of the cylinder head according to the exemplary embodiment of the present invention;

FIG. 5 is a schematic diagram of a cylinder head base plate structure according to an embodiment of the present invention;

FIG. 6 is a schematic illustration of the flow of cooling water within the lower water cavity of the cylinder head provided by an exemplary embodiment of the present invention;

FIG. 7 is a schematic illustration of cooling water flow in the upper water cavity of a cylinder head provided by an embodiment of the present invention.

In the figure:

1. an upper water chamber; 2. a lower water chamber; 3. a partition plate; 4. a communicating hole; 5. an air intake sidewall; 6. an exhaust sidewall; 7. a water inlet; 8. a water outlet; 9. an air inlet; 10. an exhaust port; 11. a fuel injector mounting hole; 12. arranging a nose bridge area; 13. a second inlet and outlet nose bridge area; 14. entering the nose bridge area; 15. a first inlet and outlet nose bridge area; 16. an intake valve guide connection; 17. an exhaust valve conduit connection; 18. a reinforcement hole; 19. a water-blocking ring.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

In the prior art, in the cylinder cover structure adopting the cooling mode that cooling water flows through an upper-layer water cavity and then flows through a lower-layer water cavity, water outlets are arranged at positions lower than the lower-layer water cavity, the cooling water flows from the lower-layer water cavity from top to bottom, and the flow trend of bubbles in the cooling liquid is always from bottom to top, so that the bubbles in the cooling liquid cannot be taken away when the cooling liquid is discharged, and after the bubbles are gathered to a certain degree on the wall surface of the cylinder cover, the heat dissipation efficiency of the cooling liquid is reduced, and the reliability of the cylinder cover is influenced.

Therefore, the invention provides the cylinder cover, the water outlet of the cylinder cover is arranged at the position above the lower-layer water cavity, and the water inlet of the cylinder cover is arranged at the position below the upper-layer water cavity, so that when cooling liquid is discharged, bubbles in the upper-layer water cavity and bubbles in the lower-layer water cavity can be taken away, the cooling effect on the cylinder cover is enhanced, and the reliability of the cylinder cover is improved.

As shown in fig. 1 and 2, the cylinder head comprises a cylinder head body and a partition plate 3, a cooling water cavity is arranged in the cylinder head body, the partition plate 3 is fixedly arranged in the cooling water cavity, the partition plate 3 divides the cooling water cavity into an upper water cavity 1 and a lower water cavity 2 from top to bottom, a communication hole 4 is formed in the partition plate 3, the communication hole 4 is communicated with the upper water cavity 1 and the lower water cavity 2, the cylinder head body is provided with an air inlet side wall 5 and an air exhaust side wall 6, the air inlet side wall 5 is provided with a water inlet 7, the water inlet 7 is communicated with the upper water cavity 1, the water inlet 7 is located below the upper water cavity 1, the air exhaust side wall 6 is provided with a water outlet 8, the water outlet 8 is communicated with the lower water cavity 2, and the water outlet 8 is located above the lower water cavity 2. When the cylinder cover is cooled, cooling water enters the upper water chamber 1 from the water inlet 7, flows into the lower water chamber 2 through the communication hole 4, and finally flows out from the water outlet 8. The bottom plate of cylinder head is a key cooling region, and cooling water flows from upper water cavity 1 to lower water cavity 2, and under the effect of self gravity, the velocity of flow is faster, and the impact force is bigger, and hugs closely the bottom plate of cylinder head when the coolant liquid flows, strengthens the cooling to the cylinder head bottom plate to the cooling effect to the cylinder head is better. And, the bubble flow trend in the cooling water is always from bottom to top, because the water inlet 7 is set up in the position that is located the upper water cavity 1 below, the cooling water also flows from bottom to top when entering the upper water cavity 1 from the water inlet 7, the cooling water flow direction is unanimous with the bubble flow direction, can drive the bubble flow, is favorable to taking away the bubble, avoids the bubble to gather on the wall of upper water cavity 1. Because the delivery port 8 sets up the position that is located the top of lower floor's water cavity 2, the flow direction when cooling water flows into delivery port 8 from lower floor's water cavity 2 is from bottom to top, and is unanimous with the flow direction of bubble to the bubble in lower floor's water cavity 2 is taken away to cooling water can prevent that the bubble from gathering on wall or baffle 3, can strengthen the cooling effect to the cylinder head, improves the reliability of cylinder head. Alternatively, the two ends of the partition plate 3 are fixedly connected with the air inlet side wall 5 and the air outlet side wall 6 respectively, so that the rigidity and the strength of the cylinder cover can be improved, and the reliability of the cylinder cover is further improved.

Optionally, the cylinder head covers a plurality of cylinders, the intake sidewall 5 is provided with one water inlet 7 corresponding to each cylinder, and the exhaust sidewall 6 is provided with one water outlet 8 corresponding to each two cylinders. As shown in fig. 3 and 4, in one embodiment, the cylinder head is applied to an in-line six-cylinder engine, the cylinder head covers six cylinders, the cylinder head is provided with six cooling water cavities, the six cooling water cavities and the six cylinders are arranged in one-to-one correspondence, the air inlet side wall 5 is provided with six water inlets 7, each cooling water cavity is communicated with one water inlet 7, and the six water inlets 7 are all arranged below the air inlet side wall 5 and are positioned below the upper water cavity 1; the exhaust side wall 6 is provided with three water outlets 8, every two cooling water cavities are communicated with one water outlet 8, and the three water outlets 8 are arranged above the exhaust side wall 6 and above the lower water cavity 2.

Alternatively, as shown in fig. 5 and 6, the cylinder head body is provided with a bottom plate, the bottom plate is provided with two air inlets 9 and two air outlets 10, the center lines of the two air inlets 9 and the two air outlets 10 are arranged in a rectangular shape, a bridge region is formed between the two air inlets 9 and the two air outlets 10, an inlet bridge region 14 is formed between the two air inlets 9, a first inlet bridge region 15 is formed between one air inlet 9 and one air outlet 10, a second inlet bridge region 13 is formed between the other air inlet 9 and the other air outlet 10, and an outlet bridge region 12 is formed between the two air outlets 10, and after cooling water flows into the lower water chamber 2 from the communication hole 4, the cooling water respectively flows through the inlet bridge region 14, the first inlet bridge region 15, the second inlet bridge region 13 and the outlet bridge region 12 and then converges to the nose bridge water outlet 8. Wherein the nose bridge region 12 is an area requiring intensive cooling, and in order to enhance the cooling of the nose bridge region 12, a reinforcement hole 18 is provided in the partition plate 3, and the reinforcement hole 18 is provided at a position facing the nose bridge region 12. The cooling water directly flows into the row nose bridge area 12 from the reinforcing hole 18, the reinforcing hole 18 can be communicated with the communication hole 4, the flow rate and the flow speed of the cooling water in the row nose bridge area 12 can be increased, the cooling effect on the row nose bridge area 12 is improved, and the reliability of the cylinder cover is improved.

Optionally, the bottom plate is provided with an injector mounting hole 11, the two intake ports 9 and the two exhaust ports 10 are arranged at intervals around the circumference of the injector mounting hole 11, the cylinder head further includes an injector bushing, the injector bushing is fixedly arranged in the injector mounting hole 11, and the injector bushing is located in the communicating hole 4. The fuel injector is fixedly arranged in the fuel injector bush, the fuel injector bush also needs to be cooled in a key mode, the fuel injector bush is arranged in the communicating hole 4, cooling water can flow through the outer wall of the bush, and cooling of the fuel injector bush can be enhanced.

Alternatively, as shown in fig. 7, the cylinder head body is provided with two exhaust valve guide connecting parts 17 and two intake valve guide connecting parts 16, and the two exhaust valve guide connecting parts 17 and the two intake valve guide connecting parts 16 are both located in the upper water chamber 1, wherein the two exhaust valve guide connecting parts 17 are also the key areas for cooling, in order to prevent the cooling water from flowing into the communication hole 4 from between the two intake valve guide connecting parts 16 near the intake side wall 5 without passing through the two exhaust valve guide connecting parts 17 after entering from the water inlet 7, a water blocking ring 19 is fixedly arranged in the upper water chamber 1, and the water blocking ring 19 is arranged between the intake side wall 5 and the intake valve guide connecting part 16 near the water inlet 7, and can prevent the cooling water from passing therethrough, so that the cooling water flows counterclockwise after entering the upper water chamber 1 from the water inlet 7 and then sequentially passes through one of the intake valve guide connecting parts 16, The first exhaust valve guide connecting part 17, the second exhaust valve guide connecting part 17 and the second intake valve guide connecting part 16 are converged into a region between the first intake valve guide connecting part 16 and the first exhaust valve guide connecting part 17, a region between the first exhaust valve guide connecting part 17 and the second exhaust valve guide connecting part 17, a region between the second exhaust valve guide connecting part 17 and the second intake valve guide connecting part 16 and a region between the first intake valve guide connecting part 16 and the second intake valve guide connecting part 16, and then flow into the communication hole 4 and the reinforcement hole 18, so that the cooling of the two intake valve guide connecting parts 16 can be enhanced.

The invention further provides a cylinder cover cooling system which comprises the cylinder cover. The cylinder cover cooling system further comprises a water inlet assembly and a water outlet assembly, the water inlet assembly is connected with the water inlet 7, the water inlet assembly provides cooling water for cooling the cylinder cover, the water outlet assembly is connected with the water outlet 8, and the water outlet assembly collects the cooling water flowing out of the cylinder cover. Cooling water directly enters the water inlet 7 from the water inlet assembly, flows into the communicating hole 4 after passing through the upper-layer water cavity 1, flows into the water outlet 8 after passing through the lower-layer water cavity 2, and directly flows into the water outlet assembly from the water outlet 8, the cooling water does not pass through the cylinder, the cylinder cover cooling system only cools the cylinder cover, and the cooling effect is better.

The invention also provides an engine comprising the cylinder head cooling system.

The invention also provides a cylinder cover cooling method, which adopts the cylinder cover cooling system and comprises the following steps:

cooling water enters the water inlet 7 from the water inlet assembly;

cooling water flows from the water inlet 7 to the upper water cavity 1 from bottom to top;

the cylinder head body is provided with two exhaust valve guide connecting parts 17 and two intake valve guide connecting parts 16, cooling water flows in the upper water cavity 1 along the anticlockwise direction, sequentially flows through one intake valve guide connecting part 16, the two exhaust valve guide connecting parts 17 and the other intake valve guide connecting part 16, and is collected between the two exhaust valve guide connecting parts 17 and the two intake valve guide connecting parts 16 to flow into the communicating hole 4;

the cylinder cover body is provided with a bottom plate, the bottom plate is provided with two air inlets 9 and two air outlets 10, cooling water flows into the lower-layer water cavity 2 from the communicating hole 4, flows through the areas between the two air outlets 10 and the two air inlets 9, is collected, and flows from bottom to top to enter the water outlet 8;

the cooling water enters the water outlet assembly from the water outlet 8.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.