Cylinder head heat dissipation structure

Abstract

The utility model relates to a cylinder head heat dissipation structure which is arranged on a cylinder head of an engine, the cylinder head is provided with a cam shaft chamber, an air inlet channel, an air outlet channel and a combustion chamber communicated with the air inlet channel and the air outlet channel respectively, and a first spark plug and a second spark plug are inserted in the cylinder head. The first spark plug and the second spark plug are arranged in the combustion chamber in a penetrating mode, and the cylinder head heat dissipation structure comprises a cooling oil pool and a partition part. The cooling oil pool is located above a combustion chamber top wall face of the combustion chamber, communicated with the cam shaft chamber and adjacent to the second spark plug, and an overflow opening is formed in the cooling oil pool so that engine lubricating oil can naturally overflow through the overflow opening after flowing back to the cooling oil pool from the cam shaft chamber. The spacing part is arranged between the first spark plug and the cooling oil pool. Therefore, the spark plug can improve the situation that the second spark plug takes away heat which is not better than the first spark plug, and is actually an optimal design.

Description

TECHNICAL FIELD

[0001] The utility model relates to a cylinder head heat dissipation structure, especially a cylinder head heat dissipation structure suitable for a fuel motorcycle. BACKGROUND

[0002] Please refer to Figure 1 and Figure 2 , which are respectively a sectional view of an existing engine and a sectional view of an existing cylinder head heat dissipation structure. An existing cylinder head heat dissipation structure 91 is shown in the figure, which is arranged at a cylinder head 912 of an engine 911. The engine 911 further includes a crankshaft 915, a fan 916 driven by the crankshaft 915, and a wind deflector 917 connected to the cylinder head 912. The cylinder head 912 is provided with a camshaft chamber 9121, an intake passage 9122, an exhaust passage 9123, and a combustion chamber 9124 in communication with the intake passage 9122 and the exhaust passage 9123, respectively, and a first spark plug 913 and a second spark plug 914 are inserted therein, so that the first spark plug 913 and the second spark plug 914 are arranged in the combustion chamber 9124. Among them, the existing cylinder head heat dissipation structure 91 is provided with an air duct 91a in the body of the cylinder head 912, an air inlet 91b is arranged in the body of the cylinder head 912 adjacent to the first spark plug 913, and an air outlet 91c is arranged on both sides of the body of the cylinder head 912 adjacent to the intake passage 9122 and the exhaust passage 9123, so as to form an air cooling heat dissipation path.

[0003] The cooling air G of the air cooling heat dissipation path is blown into the wind deflector 917 by the fan 916 driven by the crankshaft 915 of the engine 911, and then enters the cylinder head 912 through the air inlet 91b after being guided by the wind deflector 917. The cooling air first contacts the first spark plug 913, enters the air duct 91a of the cylinder head 912, and contacts the combustion chamber top wall 9124a, the intake passage outer wall 9122a, and the exhaust passage outer wall 9123a. After successively contacting the second spark plug outer wall 914a, the cooling air G absorbing heat becomes hot air, which is discharged through the air outlets 91c on both sides of the intake passage 9122 and the exhaust passage 9123.

[0004] However, after the cooling air G flows through the first spark plug 913 and the combustion chamber top wall 9124a and absorbs the heat energy after the combustion stroke of the cylinder head 912, the temperature of the cooling air G has gradually risen, so when it successively contacts the second spark plug outer wall 914a, the temperature difference is small and the heat carried away is less, resulting in that the heat dissipation effect around the second spark plug 914 is not as good as that of the first spark plug 913.

[0005] Therefore, the inventor has developed a cylinder head heat dissipation structure which can solve the above problems in the spirit of positive creation after repeated research and experiments. UTILITY MODEL CONTENT

[0006] The main purpose of the utility model is to provide a cylinder head heat dissipation structure, and the first spark plug and the second spark plug are cooled in two different cooling medium modes. The problem that the heat energy after the combustion stroke of the cylinder head is absorbed when the cooling air flows through the first spark plug and the top wall of the combustion chamber in the prior art is solved, and the temperature difference is small when the second spark plug is contacted again, so that the heat is less taken away. Therefore, the situation that the heat taken away by the second spark plug is not as good as the first spark plug can be improved.

[0007] To achieve the above purpose, the cylinder head heat dissipation structure of the utility model is arranged on a cylinder head of an engine. The cylinder head is provided with a camshaft chamber, an intake passage, an exhaust passage, a combustion chamber communicated with the intake passage and the exhaust passage, and a first spark plug and a second spark plug. The first spark plug and the second spark plug are arranged in the combustion chamber. The cylinder head heat dissipation structure comprises a cooling oil pool and a spacing part. The cooling oil pool is arranged above a top wall of the combustion chamber, is communicated with the camshaft chamber and is adjacent to the second spark plug. The cooling oil pool is provided with an overflow outlet, so that the lubricating oil of the engine flows back to the cooling oil pool from the camshaft chamber and then naturally overflows through the overflow outlet. The spacing part is arranged between the first spark plug and the cooling oil pool, so as to separate the first spark plug and the second spark plug and prevent the first spark plug and the second spark plug from being communicated through the air duct in the prior art.

[0008] The body of the cylinder head adjacent to the first spark plug can be provided with a first heat dissipation fin, and the second heat dissipation fin can be arranged above the locking thread of the second spark plug.

[0009] The fin width of the second heat dissipation fin can be greater than the radius of the locking thread of the second spark plug.

[0010] The height of the top wall of the combustion chamber can be lower than the height of the bottom plate of the cylinder head, and the top wall of the combustion chamber can be the bottom of the cooling oil pool, so as to achieve the purpose of oil storage and cooling.

[0011] The cooling oil pool can be a space formed by the top wall of the combustion chamber, the external wall of the intake passage, the external wall of the exhaust passage, the external wall of the second spark plug, the overflow outlet, the overflow outlet passage partition plate and the overflow outlet baffle.

[0012] The cylinder head can further comprise a first locking seat surface and a second locking seat surface, and the overflow outlet passage partition plate is supported between the first locking seat surface and the second locking seat surface.

[0013] The area of the overflow outlet can depend on the height of the overflow outlet baffle.

[0014] The cylinder head heat dissipation structure forms an air cooling heat dissipation path and an oil cooling heat dissipation path, and the air cooling heat dissipation path is not communicated with the oil cooling heat dissipation path.

[0015] The engine can further include a crankshaft, a fan driven by the crankshaft, and a fan cover connected to the cylinder head, and the air cooling heat dissipation path can be formed by the fan blowing cooling air into the fan cover and guiding the cooling air to dissipate heat from the first spark plug and the body of the cylinder head adjacent to the first spark plug.

[0016] The oil cooling heat dissipation path can be formed by pumping engine lubricating oil to the camshaft chamber of the cylinder head by an oil pump, returning to a cooling oil pool, and then naturally overflowing through the overflow outlet to dissipate heat from the second spark plug and the top wall of the combustion chamber.

[0017] The above summary and the following detailed description are exemplary in nature and are intended to further set forth the scope of the claimed application. Other objects and advantages of the present application will be better understood from the following detailed description taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a cross-sectional view of a conventional engine.

[0019] Figure 2 FIG. 2 is a cross-sectional view of a conventional cylinder head heat dissipation structure.

[0020] Figure 3 FIG. 3 is a cross-sectional view of an engine according to a preferred embodiment of the present application.

[0021] Figure 4 FIG. 4 is a perspective view of a cylinder head heat dissipation structure according to a preferred embodiment of the present application.

[0022] Figure 5 FIG. 5 is a cross-sectional view of a cylinder head heat dissipation structure according to a preferred embodiment of the present application.

[0023] Figure 6 FIG. 6 is a cross-sectional view of a cylinder head heat dissipation structure according to a preferred embodiment of the present application, from another perspective.

[0024] Figure 7 FIG. 7 is a cross-sectional view of a cylinder head heat dissipation structure according to a preferred embodiment of the present application, from still another perspective.

[0025] Figure 8 FIG. 8 is a schematic view of the height of the top wall of the combustion chamber and the height of the bottom plate of the cylinder head according to a preferred embodiment of the present application.

[0026] Figure 9 FIG. 9 is a schematic view of the overflow outlet passage partition plate supported between the first locking seat surface and the second locking seat surface according to a preferred embodiment of the present application.

[0027] Figure 10 Fig. 1 is a schematic view of the overflow port of a preferred embodiment of the present application.

[0028] Figure 11 Fig. 2 is a cross-sectional view of an engine having a large overflow port area of a preferred embodiment of the present application.

[0029] Figure 12 Fig. 3 is a cross-sectional view of an engine having a small overflow port area of a preferred embodiment of the present application.

[0030] Explanation of main component symbols:

[0031] 1, 91 Cylinder head heat dissipation structure

[0032] 11, 911 Engine

[0033] 12, 912 Cylinder head

[0034] 120 Cylinder head bottom plate

[0035] 121, 9121 Camshaft chamber

[0036] 122, 9122 Intake port

[0037] 122a, 9122a Intake port outer wall surface

[0038] 123, 9123 Exhaust port

[0039] 123a, 9123a Exhaust port outer wall surface

[0040] 124, 9124 Combustion chamber

[0041] 124a, 9124a Combustion chamber top wall surface

[0042] 125 First locking seat surface

[0043] 126 Second locking seat surface

[0044] 13, 913 First spark plug

[0045] 14, 914 Second spark plug

[0046] 14a, 914a Second spark plug outer wall surface

[0047] 15, 915 Crankshaft

[0048] 16, 916 Fan

[0049] 17, 917 Fan shroud

[0050] 2 Cooling oil pool

[0051] 21 Overflow port

[0052] 22 Overflow outlet channel partition

[0053] 23 Overflow outlet baffle

[0054] 3. Spacing

[0055] 41 First heat dissipation fin

[0056] 42 Second heat dissipation fin

[0057] 5. Oil pump

[0058] 91a Ventilation duct

[0059] 91b air inlet

[0060] 91c exhaust vent

[0061] F Engine Lubricating Oil

[0062] Fc, Fc' Oil quantity

[0063] G Cooling air

[0064] A, A' area

[0065] h, H, H', H1 height

[0066] L Fin width

[0067] P channel

[0068] r radius Detailed Implementation

[0069] Please see Figures 3 to 8 The figures show a cross-sectional view of the engine, a perspective view of the cylinder head cooling structure, a cross-sectional view, a cross-sectional view from another perspective, a cross-sectional view from yet another perspective, and a schematic diagram showing the height of the combustion chamber top wall and the height of the cylinder head bottom plate, respectively, according to a preferred embodiment of the present invention. A cylinder head cooling structure 1 is shown in the figures, which is disposed in a cylinder head 12 of an engine 11. The engine 11 also includes a crankshaft 15, a fan 16 driven by the crankshaft 15, and a shroud 17 connected to the cylinder head 12. The cylinder head 12 has a camshaft chamber 121, an intake manifold 122, an exhaust manifold 123, and a combustion chamber 124 communicating with the intake manifold 122 and the exhaust manifold 123 respectively. A first spark plug 13 and a second spark plug 14 are inserted into the combustion chamber 124. In this embodiment, as shown... Figure 3 and Figure 4As shown, the cylinder head 12 is provided with a plurality of first heat dissipation fins 41 adjacent to the body of the first spark plug 13, which can increase the heat dissipation area of the cylinder head 12 and improve the cooling efficiency. As shown, Figure 5 and Figure 7 As shown, the second heat dissipation fin 42 is arranged above the locking thread 141 of the second spark plug 14, and the fin width L of the second heat dissipation fin 42 is greater than the radius r of the locking thread 141 of the second spark plug 14. The second heat dissipation fin 42 can assist in conducting heat from the second spark plug 14 to the cylinder head 12, and increase the heat dissipation area when the engine lubricating oil F cools the outside of the second spark plug 14, thereby improving the heat dissipation effect of the second spark plug 14.

[0070] The cylinder head heat dissipation structure 1 comprises a cooling oil pool 2 and a spacing portion 3. The cooling oil pool 2 is located above a combustion chamber top wall 124a of the combustion chamber 124, communicates with the camshaft chamber 121 and is adjacent to the second spark plug 14. In this embodiment, the cooling oil pool 2 is formed by the space between the combustion chamber top wall 124a of the combustion chamber 124, an intake port outer wall 122a of the intake port 122, an exhaust port outer wall 123a of the exhaust port 123, a second spark plug outer wall 14a of the second spark plug 14, an overflow outlet 21, an overflow outlet passage partition plate 22 and an overflow outlet baffle 23. As shown, Figure 8 As shown, the height h of the combustion chamber top wall 124a is lower than the height H1 of a cylinder head bottom plate 120 of the cylinder head 12. The combustion chamber top wall 124a is the bottom of the cooling oil pool 2, which achieves the purpose of oil storage and cooling. The overflow outlet 21 is arranged at the overflow outlet passage partition plate 22 and the cylinder head bottom plate 120. When the liquid level of the engine lubricating oil F in the cooling oil pool 2 is higher than the overflow outlet baffle 23, the engine lubricating oil F can naturally overflow to achieve circulation cooling. The spacing portion 3 is arranged between the first spark plug 13 and the cooling oil pool 2. In this embodiment, the spacing portion 3 is integrally formed with the body of the cylinder head 12, which separates the first spark plug 13 and the second spark plug 14, so that there is no ventilation passage communication between the first spark plug 13 and the second spark plug 14.

[0071] By the above design, the cylinder head heat dissipation structure 1 can form an air cooling heat dissipation path and an oil cooling heat dissipation path, and the air cooling heat dissipation path is not communicated with the oil cooling heat dissipation path, so that the first spark plug 13 and the second spark plug 14 are cooled in two different ways. The air cooling heat dissipation path is that the cooling air G is blown into the air guide cover 17 by the fan 16, and the first spark plug 13 and the body of the cylinder head 12 adjacent to the first spark plug 13 (including the first heat dissipation fin 41) are cooled by the air guide cover 17. The oil cooling heat dissipation path is that the engine lubricating oil F is pumped to the camshaft chamber 121 of the cylinder head 12 by the oil pump 5, lubricates the internal parts of the cylinder head 12, flows back to the cooling oil pool 2 through a channel P, and then naturally overflows through the overflow outlet 21 to cool the second spark plug 14 and the top wall 124a of the combustion chamber (including the second heat dissipation fin 42).

[0072] Please refer to Figure 9 , the overflow outlet passage partition plate 22 is supported between the first locking seat surface 125 and the second locking seat surface 126, and the strength of the first locking seat surface 125 and the second locking seat surface 126 of the cylinder head 12 can be reinforced.

[0073] Please refer to Figures 10 to 12 , the area size of the overflow outlet and the height of the overflow outlet baffle, the cross-sectional view of the engine with a large overflow outlet area, and the cross-sectional view of the engine with a small overflow outlet area of a preferred embodiment of the utility model. As shown in Figure 10 , the cooling time of the engine lubricating oil F in the cooling oil pool 2, and the amount of the engine lubricating oil F in the cooling oil pool 2, can be adjusted by the height H of the overflow outlet baffle 23 between the overflow outlet passage partition plate 22 and the cylinder head bottom plate 120, and the flow of the engine lubricating oil F of the area A of the overflow outlet 21. As shown in Figure 11 , because the height H of the overflow outlet baffle 23 of the embodiment is low, the area A of the overflow outlet 21 is relatively large, and the amount Fc of the oil that can be contained in the cooling oil pool 2 is relatively small; relatively, as shown in Figure 12 , because the height H' of the overflow outlet baffle 23 of the other embodiment is high, the area A' of the overflow outlet 21 is relatively small, and the amount Fc' of the oil that can be contained in the cooling oil pool 2 is relatively large.

[0074] In summary, the cylinder head heat dissipation structure of the utility model cools the first spark plug and the second spark plug in two different cooling medium modes, can solve the problem that the heat energy after the combustion stroke of the cylinder head is absorbed when the cooling air flows through the first spark plug and the top wall of the combustion chamber, and the temperature difference is small when the cooling air contacts the outer wall of the second spark plug, so that the heat is less taken away, and the situation that the heat taken away by the second spark plug is not as good as the first spark plug can be improved.

[0075] The above examples are only examples for the convenience of description, and the scope of the right claimed by the utility model should be described according to the range protected by the patent application file, and is not limited to the above examples.

Claims

1. A cylinder head heat dissipation structure disposed in a cylinder head of an engine, characterized by comprising: The cylinder head is provided with a camshaft chamber, an intake passage, an exhaust passage, a combustion chamber communicated with the intake passage and the exhaust passage, and a first spark plug and a second spark plug, so that the first spark plug and the second spark plug are arranged in the combustion chamber. The cylinder head cooling structure comprises: a cooling oil pool arranged above a combustion chamber top wall of the combustion chamber, communicated with the camshaft chamber and adjacent to the second spark plug, and provided with an overflow outlet for naturally overflowing the engine lubricating oil backflowing from the camshaft chamber to the cooling oil pool; and a partition arranged between the first spark plug and the cooling oil pool.

2. The cylinder head heat dissipation structure according to claim 1, wherein The cylinder head is provided with a first cooling fin adjacent to the body of the first spark plug, and a second cooling fin arranged above a locking thread of the second spark plug.

3. The cylinder head heat dissipation structure according to claim 2, wherein The fin width of the second cooling fin is greater than the radius of the locking thread of the second spark plug.

4. The cylinder head heat dissipation structure according to claim 1, wherein The height of the combustion chamber top wall is lower than the height of a cylinder head bottom plate of the cylinder head, and the combustion chamber top wall is the bottom of the cooling oil pool.

5. The cylinder head heat dissipation structure according to claim 1, wherein The cooling oil pool is a space formed by the combustion chamber top wall of the combustion chamber, an intake passage outer wall of the intake passage, an exhaust passage outer wall of the exhaust passage, a second spark plug outer wall of the second spark plug, the overflow outlet, an overflow outlet passage partition, and an overflow outlet baffle.

6. The cylinder head heat dissipation structure according to claim 5, wherein The cylinder head further comprises a first locking seat surface and a second locking seat surface, and the overflow outlet passage partition is supported between the first locking seat surface and the second locking seat surface.

7. The cylinder head heat dissipation structure according to claim 5, wherein The area of the overflow outlet depends on the height of the overflow outlet baffle.

8. The cylinder head heat dissipation structure according to claim 1, wherein An air cooling heat dissipation path and an oil cooling heat dissipation path are formed by the cylinder head cooling structure, and the air cooling heat dissipation path is not communicated with the oil cooling heat dissipation path.

9. The cylinder head heat dissipation structure according to claim 8, wherein The engine further comprises a crankshaft, a fan driven by the crankshaft, and a fan cover connected to the cylinder head. The air cooling heat dissipation path is formed by blowing cooling air into the fan cover by the fan, and then guiding the cooling air by the fan cover to cool the first spark plug and the body of the cylinder head adjacent to the first spark plug.

10. The cylinder head heat dissipation structure according to claim 8, wherein The oil cooling heat dissipation path is formed by pumping engine lubricating oil to the camshaft chamber of the cylinder head by an oil pump, backflowing to the cooling oil pool, and then naturally overflowing through the overflow outlet to cool the second spark plug and the combustion chamber top wall.

Images