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 an air inlet channel, an exhaust channel and a combustion chamber, and a first spark plug and a second spark plug are inserted into the cylinder head and penetrate through the combustion chamber. The cylinder head heat dissipation structure comprises a heat dissipation channel and a second spark plug sleeve. The heat dissipation channel is formed in the cylinder head and provided with a heat dissipation channel air inlet and a heat dissipation channel air outlet. The second spark plug sleeve is fixedly arranged on a second spark plug locking seat face of the cylinder head, wraps the second spark plug and is provided with a communicating hole and a sleeve air outlet, and the communicating hole is communicated with the heat dissipation channel. And a guide surface is further arranged in the cylinder head, so that one part of cooling air flowing through the heat dissipation channel can be guided to the communicating hole through the guide surface, and is exhausted to the outside through the sleeve air outlet after flowing through the internal space in the second spark plug sleeve, and the other part of the cooling air can be exhausted to the outside through the heat dissipation channel air outlet. Therefore, heat dissipation of the second spark plug is optimized in a cooling channel mode, engine lubricating oil of the cylinder head can be prevented from flowing into the heat dissipation channel, and then the oil leakage phenomenon is prevented.

Description

TECHNICAL FIELD

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

[0002] Please refer to Figure 1 and Figure 2 , which are respectively a sectional view and a top view of the prior art cylinder head heat dissipation structure. A cylinder head heat dissipation structure 900 is shown in the figure, which is arranged at a cylinder head 911 of an engine 9. The engine 9 further includes a crankshaft 920, a fan 921 driven by the crankshaft 920, and a wind deflector 922 connected to the cylinder head 911. The cylinder head 911 is provided with an air inlet 9111, an air outlet 9112, and a combustion chamber 9113 in communication with the air inlet 9111 and the air outlet 9112, respectively, and is provided with a first spark plug 912 and a second spark plug 913, so that the first spark plug 912 and the second spark plug 913 are arranged in the combustion chamber 9113. Among them, the prior art cylinder head heat dissipation structure 900 is provided with a heat dissipation channel 914 in the body of the cylinder head 911. The heat dissipation channel 914 has a heat dissipation channel air inlet 9141 and a heat dissipation channel air outlet 9142 to form an air cooling heat dissipation path.

[0003] As shown in Figure 1 and Figure 2 , from the sectional view of the cylinder head 911, the included angle θ' between the first spark plug 912 and the second spark plug 913 is 90 o The cooling air G1 of the air cooling heat dissipation path is blown into the wind deflector 922 by the fan 921 driven by the crankshaft 920 of the engine 9, and then enters the cylinder head 911 through the heat dissipation channel air inlet 9141 under the guidance of the wind deflector 922. The cooling air G1 first contacts the first spark plug 912, enters the heat dissipation channel 914, and contacts an air inlet outer wall surface 9111a, an air outlet outer wall surface 9112a, and a combustion chamber outer wall surface 9113a. After successively contacting the second spark plug outer wall surface 9131a, the cooling air G1 absorbing heat becomes hot air G2, which is discharged through the heat dissipation channel air outlet 9142 on the side of the air inlet 9111 and the air outlet 9112.

[0004] However, after the cooling air G1 flows through the first spark plug 912 and the combustion chamber outer wall surface 9113a and absorbs the heat energy after the combustion stroke of the cylinder head 911, the temperature of the cooling air G1 has gradually risen. Therefore, when the cooling air G1 successively contacts the second spark plug outer wall surface 9131a, the temperature difference is small and the heat carried away is less. In addition, only one side of the second spark plug 913 contacts the cooling air G1, resulting in a poor heat dissipation effect around the second spark plug 913 compared with the first spark plug 912.

[0005] Please refer to Figure 3This is a cross-sectional view of another existing cylinder head cooling structure. Figure 3 The cylinder head cooling structure 900' and Figure 1 The cylinder head cooling structure 900 is similar, but differs in that, viewed from the cross-sectional direction of the cylinder head 911', the first spark plug 912' and the second spark plug 913' are configured on the same side. Cooling air G1 first contacts the first spark plug 912' and the second spark plug 913', enters the cooling channel 914', and then subsequently contacts the outer wall of the intake manifold (not shown), the outer wall of the exhaust manifold (not shown), and the outer wall of the combustion chamber 9113a'. However, this design results in greater flow resistance when the airflow passes through the first spark plug 912' and the second spark plug 913', leading to less effective heat dissipation within the cooling channel 914'. Figure 1 , Figure 4 good.

[0006] Please see Figure 4 This is a cross-sectional view of another existing cylinder head cooling structure. Figure 4 The cylinder head cooling structure 900” and Figure 1 Similar to the cylinder head cooling structure 900, the difference lies in that: viewed from the cross-sectional direction of the cylinder head 911", the first spark plug 912" and the second spark plug 913" are arranged opposite each other. Cooling air G1 first contacts the first spark plug 912" and enters the cooling channel 914", then subsequently contacts the outer wall of the intake manifold (not shown), the outer wall of the exhaust manifold (not shown), the outer wall of the combustion chamber 9113a", and the outer wall of the second spark plug 9131a". However, compared to... Figure 1 Similarly, because the temperature difference of the cooling air G1 is small and it carries away less heat, the heat dissipation effect around the second spark plug 913” is not as good as that of the first spark plug 912”.

[0007] Driven by this, and in the spirit of active invention, the inventor sought a cylinder head heat dissipation structure that could solve the above problems. After several research and experiments, he finally completed this utility model. Utility Model Content

[0008] The main objective of this invention is to provide a cylinder head heat dissipation structure. The invention employs a cooling channel design, allowing a portion of the cooling air flowing through the channel to be guided by a guide surface to a connecting hole, and then discharged after passing through the internal space of the second spark plug sleeve. This optimizes the heat dissipation of the second spark plug and improves the situation where the second spark plug's heat dissipation is not as effective as that of the first spark plug. Furthermore, the second spark plug sleeve not only forms an optimized heat dissipation channel for the second spark plug but also prevents engine lubricating oil from flowing into the cooling channel, thereby preventing oil leakage.

[0009] To achieve the above object, the cylinder head heat dissipation structure is arranged on a cylinder head of an engine, the cylinder head is provided with an air inlet, an air outlet and a combustion chamber communicated with the air inlet and the air outlet, and a first spark plug and a second spark plug are arranged in the cylinder head and penetrate into the combustion chamber, the cylinder head heat dissipation structure comprises a heat dissipation channel and a second spark plug sleeve.

[0010] The cylinder head can be provided with a heat dissipation fin, the heat dissipation fin is arranged on the side of the first spark plug, thereby increasing the heat convection conduction area of the cylinder head body, improving the cooling efficiency and achieving better heat dissipation effect.

[0011] The heat dissipation channel can be formed by an air inlet outer wall of the air inlet, an air outlet outer wall of the air outlet, a combustion chamber outer wall of the combustion chamber and a second spark plug outer wall of the second spark plug.

[0012] The cylinder head heat dissipation structure, viewed from the top of the cylinder head heat dissipation structure, the first spark plug center line and the second spark plug center line can have an included angle, the included angle can be greater than 90 o .

[0013] The cylinder head heat dissipation structure, viewed from the top of the cylinder head heat dissipation structure, the first spark plug center line and the second spark plug center line can have an included angle, the included angle can be less than 90 o .

[0014] The engine can be arranged on a vehicle, when the two wheels of the vehicle are in contact with the ground, the second spark plug sleeve can be located on a ground level, the engine crankshaft center and the rear wheel center connecting line can have a first angle with the ground level, the second spark plug sleeve center line can have a second angle with the ground level, and the second angle can be less than the first angle, thereby the opening of the second spark plug sleeve faces downward, and the condensed water in the second spark plug sleeve can flow out naturally when the engine is cold.

[0015] The above summary of the disclosure and the following detailed description are exemplary in nature and are intended to further define the scope of the application of the present application. Other objectives and advantages of the present application will be described in the following detailed description of the application and in the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a sectional view of a prior cylinder head heat dissipation structure.

[0017] Figure 2 is a top view of a prior cylinder head heat dissipation structure.

[0018] Figure 3 is a sectional view of another prior cylinder head heat dissipation structure.

[0019] Figure 4 is a sectional view of still another prior cylinder head heat dissipation structure.

[0020] Figure 5 is a side view of a cylinder head heat dissipation structure of a preferred embodiment of the present application.

[0021] Figure 6A is a top view of a cylinder head heat dissipation structure of a preferred embodiment of the present application.

[0022] Figure 6B is a bottom view of a cylinder head heat dissipation structure of a preferred embodiment of the present application.

[0023] Figure 7 is a sectional view of a cylinder head heat dissipation structure of a preferred embodiment of the present application.

[0024] Figure 8 is a sectional view of a cylinder head heat dissipation structure of a preferred embodiment of the present application from another perspective.

[0025] Figure 9 is a sectional view of a cylinder head heat dissipation structure of a preferred embodiment of the present application from still another perspective.

[0026] Figure 10 is a sectional view of an engine of a preferred embodiment of the present application. Figure 9

[0027] is a sectional view of an engine of a preferred embodiment of the present application. Figure 11

[0028] is a schematic view of a vehicle equipped with an engine having a cylinder head heat dissipation structure of a preferred embodiment of the present application. Figure 12

[0029] is a sectional view of an engine of a preferred embodiment of the present application. Figure 13 Figure 12

[0030] ​​Explanation of main element symbols:

[0031] 1 engine

[0032] 100 cylinder head heat dissipation structure

[0033] 11 cylinder head

[0034] 111 intake port

[0035] 1111 intake port outer wall surface

[0036] 112 exhaust port

[0037] 1121 exhaust port outer wall surface

[0038] 113 combustion chamber

[0039] 1131 combustion chamber outer wall surface

[0040] 12 first spark plug

[0041] 13 second spark plug

[0042] 131 second spark plug outer wall surface

[0043] 14 heat dissipation passage

[0044] 141 heat dissipation passage air inlet

[0045] 142 heat dissipation passage air outlet

[0046] 15 second spark plug sleeve

[0047] 151 communication hole

[0048] 152 sleeve air outlet

[0049] 16 second spark plug locking seat surface

[0050] 17 guide surface

[0051] 18 heat dissipation fin

[0052] 19 second spark plug cap

[0053] 2 vehicle

[0054] 3 oil pump

[0055] 9 engine

[0056] 900, 900', 900" cylinder head heat dissipation structure

[0057] 911, 911', 911" cylinder head

[0058] 9111 intake port

[0059] 9111a intake passage outer wall surface

[0060] 9112a exhaust passage outer wall surface

[0061] 9113a, 9113a’, 9113a” combustion chamber outer wall surface

[0062] 9112 exhaust passage

[0063] 9113 combustion chamber

[0064] 912, 912’, 912” first spark plug

[0065] 913, 913’, 913” second spark plug

[0066] 9131a, 9131a” second spark plug outer wall surface

[0067] 914, 914’, 914” heat dissipation passage

[0068] 9141 heat dissipation passage air inlet

[0069] 9142 heat dissipation passage air outlet

[0070] 920 crankshaft

[0071] 921 fan

[0072] 922 fan shroud

[0073] θ, θ’ included angle

[0074] θ1 first angle

[0075] θ2 second angle

[0076] C1 first spark plug center line

[0077] C2 second spark plug center line

[0078] C3 crankshaft center

[0079] C4 rear wheel center

[0080] C5 sleeve center line

[0081] H horizon

[0082] G1 cooling air

[0083] G2 hot gas

[0084] O engine lubricating oil DETAILED DESCRIPTION

[0085] Please refer to Figures 5 to 8, which are respectively side view, top view, bottom view, sectional view and sectional view of another perspective of the cylinder head heat dissipation structure of a preferred embodiment of the present application. A cylinder head heat dissipation structure 100 is shown in the figure, which is arranged in a cylinder head 11 of an engine 1, the cylinder head 11 is provided with an intake passage 111, an exhaust passage 112 and a combustion chamber 113 communicated with the intake passage 111 and the exhaust passage 112 respectively, and a first spark plug 12 and a second spark plug 13 are inserted, so that the first spark plug 12 and the second spark plug 13 are arranged in the combustion chamber 113. In the embodiment, the cylinder head 11 is provided with a plurality of heat dissipation fins 18, which are arranged on the side of the first spark plug 12, thereby increasing the heat convection conduction area of the body of the cylinder head 11, improving the cooling efficiency and achieving better heat dissipation effect. In addition, as shown in Figure 6A , from the top view of the cylinder head heat dissipation structure 100, a first spark plug center line C1 of the first spark plug 12 and a second spark plug center line C2 of the second spark plug 13 have an included angle θ, the included angle θ is less than 90 o , but the present application is not limited thereto, and the included angle θ can be greater than 90 o , as shown in Figure 6B , the present application further provides a bottom view of the cylinder head heat dissipation structure 100 for reference.

[0086] As shown in Figures 7 to 8 , the cylinder head heat dissipation structure 100 comprises a heat dissipation channel 14 and a second spark plug sleeve 15. The heat dissipation channel 14 is arranged in the cylinder head 11 and has a heat dissipation channel air inlet 141 and a heat dissipation channel air outlet 142, and the heat dissipation channel 14 of the embodiment is a channel formed by an intake passage outer wall surface 1111 of the intake passage 111, an exhaust passage outer wall surface 1121 of the exhaust passage 112, a combustion chamber outer wall surface 1131 of the combustion chamber 113 and a second spark plug outer wall surface 131 of the second spark plug 13, so as to form an air cooling heat dissipation path. In addition, the second spark plug sleeve 15 is fixed on a second spark plug locking seat surface 16 of the cylinder head 11 and covers the second spark plug 13, and has a communication hole 151 and a sleeve air outlet 152, the communication hole 151 is communicated with the heat dissipation channel 14, so that the cooling air G1 of the heat dissipation channel 14 can be guided into the second spark plug sleeve 15 through the communication hole 151, and the second spark plug 13 and the second spark plug cap 19 are cooled.

[0087] Please refer to Figures 9 to 10 , which are respectively sectional view of another perspective of the cylinder head heat dissipation structure of a preferred embodiment of the present application and Figure 9A partial enlarged view of the R1 region. As shown, the cylinder head 11 is further provided with a guide surface 17, so that a portion of the cooling air G1 flowing through the heat dissipation channel 14 can be guided to the communication hole 151 through the guide surface 17, and after flowing through the internal space in the second spark plug sleeve 15, the cooling air G1 is turned into hot air G2 after absorbing the heat of the second spark plug 13 and the second spark plug cap 19, and is discharged to the outside through the sleeve air outlet 152, and another portion can be discharged to the outside through the heat dissipation channel air outlet 142, so as to achieve the purpose of heat dissipation.

[0088] Please refer to Figure 11 A sectional view of the engine of a preferred embodiment of the present application. As shown, the engine lubricating oil O is delivered to the cylinder head 11 through the oil pump 3 to lubricate and cool the internal parts of the engine 1, and part of the engine lubricating oil O flows back into the cylinder head 11. The second spark plug sleeve 15 is arranged between the heat dissipation channel 14 and the engine lubricating oil O, so that the engine lubricating oil O in the cylinder head 11 is prevented from flowing into the heat dissipation channel 14, thereby preventing oil leakage.

[0089] Please refer to Figures 12 to 13 Fig. 2 and Fig. 3 are schematic views of a vehicle carrying an engine with the cylinder head heat dissipation structure of a preferred embodiment of the present application, respectively. Figure 12 A partial enlarged view of the R2 region. As shown, the engine 1 is arranged on a vehicle 2, and when the two wheels of the vehicle 2 are in contact with the ground, the second spark plug sleeve 15 is located at a ground level H, the line connecting the crankshaft center C3 of the engine 1 and the rear wheel center C4 has a first angle θ1 with the ground level H, and the sleeve center line C5 of the second spark plug sleeve 15 has a second angle θ2 with the ground level H, and the second angle θ2 is smaller than the first angle θ1, so that the opening of the second spark plug sleeve 15 faces downward, and the condensate water formed in the second spark plug sleeve 15 due to the contact between the parts and the warm air can flow out naturally.

[0090] In summary, the cylinder head heat dissipation structure 100 of the present application is designed in a cooling channel manner, so that a portion of the cooling air G1 flowing through the heat dissipation channel 14 can be guided to the communication hole 151 through the guide surface 17, and after flowing through the internal space in the second spark plug sleeve 15, the cooling air G1 is discharged, which optimizes the heat dissipation of the second spark plug 13 and improves the situation that the second spark plug 13 cannot take away heat as well as the first spark plug 12. On the other hand, by arranging the second spark plug sleeve 15, in addition to forming the heat dissipation channel 14 for optimizing the heat dissipation of the second spark plug 13, the engine lubricating oil O in the cylinder head 11 is prevented from flowing into the heat dissipation channel 14, thereby preventing oil leakage.

[0091] The above embodiments are only examples for convenience of illustration, and the scope of the rights claimed by the present application should be based on the scope of protection claimed in the patent application file, and not limited to the above embodiments.

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 an intake port, an exhaust port, a combustion chamber communicated with the intake port and the exhaust port, 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 heat dissipation channel arranged in the cylinder head, the heat dissipation channel is provided with a heat dissipation channel air inlet and a heat dissipation channel air outlet; and a second spark plug sleeve arranged on a second spark plug locking seat surface of the cylinder head and covering the second spark plug, the second spark plug sleeve is provided with a communication hole and a sleeve air outlet, the communication hole is communicated with the heat dissipation channel; wherein, the cylinder head is further provided with a guide surface, so that a part of the cooling air flowing through the heat dissipation channel can be guided to the communication hole through the guide surface, and then flows through the internal space of the second spark plug sleeve and is discharged to the outside through the sleeve air outlet, and another part of the cooling air can be discharged to the outside through the heat dissipation channel air outlet.

2. The cylinder head heat dissipation structure according to claim 1, wherein The cylinder head is provided with a heat dissipation fin, and the heat dissipation fin is located on the side of the first spark plug.

3. The cylinder head heat dissipation structure according to claim 1, wherein The heat dissipation channel is formed by an intake port outer wall surface of the intake port, an exhaust port outer wall surface of the exhaust port, a combustion chamber outer wall surface of the combustion chamber and a second spark plug outer wall surface of the second spark plug.

4. The cylinder head heat dissipation structure according to claim 1, wherein The first spark plug center line and the second spark plug center line of the first spark plug and the second spark plug have an included angle greater than 90 degrees as viewed from the top of the cylinder head heat dissipation structure o .

5. The cylinder head heat dissipation structure according to claim 1, wherein The first spark plug center line and the second spark plug center line of the first spark plug and the second spark plug have an included angle less than 90 degrees as viewed from the top of the cylinder head heat dissipation structure o .

6. The cylinder head heat dissipation structure according to claim 1, wherein The engine group is arranged on a vehicle, when two wheels of the vehicle are in contact with the ground, the second spark plug sleeve is located on a ground level, a connecting line between a crankshaft center of the engine and a rear wheel center has a first angle with the ground level, a sleeve center line of the second spark plug sleeve has a second angle with the ground level, and the second angle is smaller than the first angle.

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