Cooling structure for a cylinder head and engine

Abstract

The utility model discloses a cooling structure for cylinder cover and engine, and the cooling structure includes four valve ports of being located at the bottom of cylinder cover, cooling cavity of being located at the top of cylinder cover, four valve ports include two inlet valve ports and two exhaust valve ports that are side by side with two inlet valve ports, and form four bridge areas between valve ports, and each bridge area is correspondingly provided with first linear flow channel, and each valve port is correspondingly assembled with one valve seat ring, and the annular flow channel is formed between valve seat ring and valve port, and each annular flow channel has the liquid inlet and liquid outlet that communicate, and the liquid inlet of each annular flow channel is correspondingly connected with one first flow channel in cylinder cover, and the liquid outlet of each annular flow channel is correspondingly connected with one second linear flow channel in cylinder cover, and each first flow channel and the first linear flow channel that is correspondingly close to this first flow channel are connected with cooling cavity through first water outlet, and each second linear flow channel and the first linear flow channel that is correspondingly close to this second linear flow channel are connected with cooling cavity through first water inlet.

Description

Technical Field

[0001] This invention relates to the field of engine cooling technology, and particularly to a cooling structure for a cylinder head and an engine including the same. Background Technology

[0002] When the engine is running, the bridge area between the valves is the region of the cylinder head with the highest concentration of heat load. Its thickness is usually relatively thin, making it prone to stress concentration and cracking due to high temperatures. The valve seats, because they are mounted on the valve doors, are constantly exposed to high temperature and high pressure environments, making their working cone surfaces susceptible to cracking, burning, or wear. Therefore, cooling of the bridge area and valve seats is necessary. However, due to the compact space between the bridge area and valve seats, traditional cooling water channels cannot adequately cool both, easily creating cooling dead zones. This utility model solves at least one of the above-mentioned technical problems. Summary of the Invention

[0003] The purpose of this invention is to solve the problem in the prior art that due to the compact space between the nose bridge area and the valve seat, traditional cooling water channels cannot adequately cool both, easily creating cooling dead zones. By providing a cooling structure for the cylinder head, this invention can simultaneously cool both the nose bridge area and the valve seat, reducing the formation of cooling dead zones and improving the cooling effect.

[0004] The objective of this utility model is achieved through the following technical solution: In a first aspect, this utility model provides a cooling structure for a cylinder head, including four valve openings at the bottom of the cylinder head and a cooling chamber at the top of the cylinder head. The four valve openings include two intake valve openings and two exhaust valve openings arranged side by side with the two intake valve openings. Four nose bridge areas are formed between the two intake valve openings, between the two exhaust valve openings, and between the intake valve openings and the adjacent exhaust valve openings. Each of the nose bridge areas is provided with a first straight flow channel located inside the cylinder head; Each valve seat is fitted with a valve seat ring, and an annular flow channel is formed between each valve seat ring and each valve seat ring; each annular flow channel has a liquid inlet and a liquid outlet connected to each other; the liquid inlet of each annular flow channel is connected to a first flow channel located inside the cylinder head; the liquid outlet of each annular flow channel is connected to a second straight flow channel located inside the cylinder head. Each of the first flow channels and the corresponding first straight flow channel close to the first flow channel are connected to the cooling chamber through a first outlet; each of the second straight flow channels and the corresponding first straight flow channel close to the second straight flow channel are connected to the cooling chamber through a first inlet.

[0005] The beneficial effects of this invention are as follows: During actual engine operation, the cooling medium in the cooling chamber, under the action of the water pump, flows simultaneously into the parallel flow channel formed by the first flow channel and the first straight flow channel through the first outlet. This results in a large equivalent flow cross-section and low flow resistance. Part of the cooling medium flows into the inlet of the annular flow channel through the first flow channel, while the other part flows into the first straight flow channel, achieving simultaneous cooling of the nose bridge area and valve seat ring, ensuring the same inlet water temperature and more uniform cooling. The cooling medium in the annular flow channel flows into the second straight flow channel through the outlet of the annular flow channel. The second straight flow channel and the first straight flow channel simultaneously flow into the cooling chamber through the first inlet, making the temperature field of the cooling medium more uniform. Thus, it can simultaneously achieve uniform cooling of the nose bridge area and valve seat ring, reduce the formation of cooling dead zones, and improve the cooling effect on the nose bridge area and valve seat ring.

[0006] In some feasible implementations, the first flow channel includes: The first sub-straight flow channel is connected to the cooling chamber through the first water outlet, and the corresponding first straight flow channel is connected to the cooling chamber through the first water outlet. The second sub-straight flow channel is connected to the first sub-straight flow channel and the inlet of the corresponding annular flow channel.

[0007] In some feasible implementations, a water-dividing angle is formed between the first sub-straight flow channel and the first straight flow channel, the water-dividing angle being used to reduce the water-dividing resistance of the first outlet.

[0008] In some feasible implementations, the water-dividing angle is in the range of 30° < water-dividing angle < 90°.

[0009] In some feasible implementations, the inlet and outlet of the annular flow channel are symmetrically distributed at 180° at both ends of the diameter of the annular flow channel.

[0010] In some feasible implementations, the inlet and outlet of each of the annular channels are formed by a single drilling process.

[0011] In some feasible embodiments, the outer wall of the valve seat ring is provided with a groove around the central axis of the valve seat ring, and when the valve seat ring is assembled on the valve opening, the groove and the valve opening form an annular flow channel for the cooling medium to pass through.

[0012] A second aspect of this invention provides an engine comprising the cooling structure described above. Attached Figure Description

[0013] Figure 1 This is a simplified cross-sectional view of a cooling structure for a cylinder head according to the present invention. Figure 1 ; Figure 2 This is a simplified cross-sectional view of a cooling structure for a cylinder head according to the present invention. Figure 2 .

[0014] In the diagram, 1 is the cylinder head; 2 is the intake port; 3 is the exhaust port; 4 is the first straight flow channel; 5 is the valve seat; 51 is the groove; 6 is the annular flow channel; 61 is the liquid inlet; 62 is the liquid outlet; 7 is the first flow channel; 71 is the first sub-straight flow channel; 72 is the second sub-straight flow channel; 8 is the second straight flow channel; 9 is the first water outlet; 10 is the first water inlet; and 11 is the cooling chamber. Detailed Implementation

[0015] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0016] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0017] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0018] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or display that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or display.

[0019] See appendix Figure 1 and attached Figure 2As shown, this utility model provides a cooling structure for a cylinder head, including four air inlets at the bottom of the cylinder head 1 and a cooling cavity 11 at the top of the cylinder head 1. The four air inlets include two intake inlets 2 and two exhaust inlets 3 arranged side by side with the two intake inlets 2. Four nose bridge areas are formed between the two intake inlets 2, between the two exhaust inlets 3, and between the intake inlets 2 and the adjacent exhaust inlets 3 (not shown in the figure).

[0020] It is worth noting that when the engine is running, the bridge area formed between the valves is the area of ​​the cylinder head 1 with the most concentrated heat load.

[0021] Each nose bridge area has a corresponding first straight flow channel 4 located within the cylinder head 1. It should be noted that the flow direction of the first straight flow channel 4 intersects the center line connecting the two adjacent valves forming the corresponding nose bridge area. It should also be noted that the first straight flow channel 4 can be formed within the cylinder head 1 along the surface of the cylinder head 1 through a single drilling process.

[0022] Cooling of the bridge area is achieved by introducing a cooling medium (such as water) into the first straight flow channel 4, thereby reducing stress concentration and cracks caused by high temperature.

[0023] Each valve seat 5 is fitted with a corresponding valve seat ring 5, and an annular flow channel 6 is formed between each valve seat ring 5 and each valve seat 5. Each annular flow channel 6 has a connected inlet 61 and an outlet 62. The inlet 61 of each annular flow channel 6 is connected to a first flow channel 7 located inside the cylinder head 1. The outlet 62 of each annular flow channel 6 is connected to a second straight flow channel 8 located inside the cylinder head 1. It should be noted that the second straight flow channel 8 can be formed inside the cylinder head 1 along the surface of the cylinder head 1 through a single drilling process.

[0024] The valve seat 5 is circumferentially cooled by introducing a cooling medium (such as water) into the liquid inlet 61 of the annular flow channel 6, thereby reducing abnormal wear, cracking, deformation and other issues caused by high temperature, and thus increasing the service life of the valve seat 5.

[0025] Each first flow channel 7 and the corresponding first straight flow channel 4 close to the first flow channel 7 are connected to the cooling chamber 11 through the first outlet 9; each second straight flow channel 8 and the corresponding first straight flow channel 4 close to the second straight flow channel 8 are connected to the cooling chamber 11 through the first inlet 10. The cooling chamber 11 is provided with a cooling medium.

[0026] During actual engine operation, the cooling medium in the cooling chamber 11, under the action of the water pump, flows simultaneously into the parallel flow channel formed by the first flow channel 7 and the first straight flow channel 4 through the first outlet 9. This results in a large equivalent flow cross-section and low flow resistance. Part of the cooling medium flows into the inlet 61 of the annular flow channel 6 through the first flow channel 7, while the other part flows into the first straight flow channel 4, achieving simultaneous cooling of the nose bridge area and valve seat 5, ensuring the same inlet water temperature and more uniform cooling. The cooling medium in the annular flow channel 6 flows into the second straight flow channel 8 through the outlet 62 of the annular flow channel 6. The second straight flow channel 8 and the first straight flow channel 4 simultaneously flow into the cooling chamber 11 through the first inlet 10, making the temperature field of the cooling medium more uniform. Thus, it can simultaneously achieve uniform cooling of the nose bridge area and valve seat 5, reduce the formation of cooling dead zones, and improve the cooling effect of the nose bridge area and valve seat 5.

[0027] In one feasible implementation, the first flow channel 7 includes a first sub-straight flow channel 71 and a second sub-straight flow channel 72.

[0028] The first sub-straight flow channel 71 and the corresponding first straight flow channel 4 close to the first sub-straight flow channel 71 are connected to the cooling chamber 11 through the first outlet 9.

[0029] The second sub-straight flow channel 72 is connected to the first sub-straight flow channel 71 and the inlet 61 of the corresponding annular flow channel 6.

[0030] Both the first sub-straight flow channel 71 and the second sub-straight flow channel 72 can be formed in the cylinder head 1 through a single drilling process along the surface of the cylinder head 1. This design can optimize the design of the first flow channel 7 according to the structure of the cylinder head 1, so as to achieve uniform cooling of the nose bridge area and the valve seat 5 at the same time.

[0031] Preferably, a water-dividing angle is formed between the first sub-straight flow channel 71 and the first straight flow channel 4, and the water-dividing angle is used to reduce the water-dividing resistance of the first outlet 9.

[0032] Furthermore, the range of the water-dividing angle is: 30° < water-dividing angle < 90°, for example, it can be 30°, 45°, 60° or 80°. The first sub-straight flow channel 71 and the first straight flow channel 4 are connected through the first outlet 9. Through the acute angle design within this range, the water-dividing resistance generated by the obtuse angle of the first outlet 9 can be reduced, and the water-dividing effect is more uniform.

[0033] Preferably, the inlet 61 and outlet 62 of the annular flow channel 6 are symmetrically distributed at 180° at both ends of the diameter of the annular flow channel 6. This ensures that the flow velocity of the cooling medium flowing through both sides of the annular flow channel 6 is the same, avoiding excessive local temperature differences and achieving a more uniform cooling distribution for the valve seat ring 5.

[0034] Preferably, the inlet 61 and outlet 62 of each annular flow channel 6 can be formed by drilling in one step, which facilitates the symmetrical distribution of the two and reduces the complexity of the process. In some feasible implementations, in conjunction with the appendix Figure 2 As shown, the outer wall of the valve seat 5 is provided with a groove 51 around the central axis of the valve seat 5. When the valve seat 5 is assembled on the valve door, an annular flow channel 6 is formed between the groove 51 and the valve door for the cooling medium to pass through.

[0035] The annular flow channel 6 formed between the groove 51 on the outer wall of the valve seat 5 and the valve opening can effectively achieve uniform circumferential cooling of the valve seat 5, while the manufacturing process is simple.

[0036] In a second aspect, this utility model provides an engine including the aforementioned cooling structure. This cooling structure enables the engine to effectively cool heated components such as the cylinder head 1, the nose bridge area, and the valve seat 5, thereby extending the service life of the heated components and ensuring stable engine operation under normal and stable temperatures.

[0037] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention, and all such changes should fall within the protection scope of the claims of the present invention.

Claims

1. A cooling structure for a cylinder head, comprising four air inlets at the bottom of a cylinder head (1) and a cooling cavity (11) at the top of the cylinder head (1), wherein the four air inlets include two intake inlets (2) and two exhaust inlets (3) arranged side-by-side with the two intake inlets (2), and four nose bridge areas are formed between the two intake inlets (2), between the two exhaust inlets (3), and between the intake inlets (2) and the adjacent exhaust inlets (3); characterized in that, Each of the nose bridge areas is provided with a first straight flow channel (4) located in the cylinder head (1); Each valve seat is fitted with a valve seat ring (5), and an annular flow channel (6) is formed between each valve seat ring (5) and each valve seat ring; each annular flow channel (6) has a liquid inlet (61) and a liquid outlet (62) connected to each other; the liquid inlet (61) of each annular flow channel (6) is connected to a first flow channel (7) located in the cylinder head (1); the liquid outlet (62) of each annular flow channel (6) is connected to a second straight flow channel (8) located in the cylinder head (1); Each of the first flow channels (7) and the corresponding first straight flow channel (4) close to the first flow channel (7) are connected to the cooling chamber (11) through the first outlet (9); each of the second straight flow channels (8) and the corresponding first straight flow channel (4) close to the second straight flow channel (8) are connected to the cooling chamber (11) through the first inlet (10).

2. The cooling structure according to claim 1, characterized in that, The first flow channel (7) includes: The first sub-straight flow channel (71) is connected to the cooling chamber (11) through the first outlet (9) and the corresponding first straight flow channel (4); The second sub-straight flow channel (72) is connected to the first sub-straight flow channel (71) and the inlet (61) of the corresponding annular flow channel (6).

3. The cooling structure according to claim 2, characterized in that, A water-dividing angle is formed between the first sub-straight flow channel (71) and the first straight flow channel (4), and the water-dividing angle is used to reduce the water-dividing resistance of the first outlet (9).

4. The cooling structure according to claim 3, characterized in that, The range of the water-dividing angle is: 30° < water-dividing angle < 90°.

5. The cooling structure according to claim 1, characterized in that, The inlet (61) and outlet (62) of the annular flow channel (6) are symmetrically distributed at 180° at both ends of the diameter of the annular flow channel (6).

6. The cooling structure according to claim 2, characterized in that, The inlet (61) and outlet (62) of each of the annular channels (6) are formed by a single drilling process.

7. The cooling structure according to claim 1, characterized in that, The outer wall of the valve seat (5) is provided with a groove (51) around the central axis of the valve seat (5). When the valve seat (5) is assembled on the valve opening, the groove (51) and the valve opening form an annular flow channel (6) for the cooling medium to pass through.

8. An engine, characterized in that, The engine includes the cooling structure described in any one of claims 1-7.

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