Double-cylinder motorcycle engine cylinder head with cooling air duct

Abstract

The utility model discloses a double-cylinder motorcycle engine cylinder head with a cooling air duct, which comprises a cylinder head body and radiating fin components arranged on four sides of the cylinder head body, two spark plug assembly holes are arranged in a cavity of the cylinder head body, a vertically arranged air inlet channel is arranged between the two spark plug assembly holes, and the cooling air duct is arranged in the air inlet channel. A transverse heat dissipation channel communicated with the air inlet channel is arranged at the end, away from the air inlet, of the air inlet channel, the tail end of the transverse heat dissipation channel is arranged on one side of the cylinder head body to form an air outlet, and the transverse heat dissipation channel corresponds to and covers the face, corresponding to the combustion chamber, of the cylinder head body. The air inlet channel and the transverse heat dissipation channel are arranged to conduct local heat dissipation on the spark plug assembly hole position in the middle of the cylinder head and the corresponding combustion chamber position, the cooling fin assembly is combined to conduct heat dissipation on the cylinder head body, the heat dissipation effect is better, targeted heat dissipation is conducted on the position where heat is concentrated and the heat dissipation effect is poor, and the service life of the cylinder head is effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the field of motorcycle engines, and particularly relates to a cylinder head of a double-cylinder motorcycle engine with a cooling air duct. Background Art

[0002] There are mainly two types of motorcycle engine cylinder heads: air-cooled and water-cooled. The air-cooled cylinder head is provided with heat dissipation fins around the combustion chamber, and the heat on the heat dissipation fins is taken away by air flow. For the cylinder head of a double-cylinder motorcycle engine, the volume of the cylinder head is larger than that of a single-cylinder engine, and the requirement for heat dissipation is also higher. For a double-cylinder motorcycle engine, in the prior art, the heat dissipation effect of the cylinder head of a double-cylinder motorcycle engine is mainly improved by increasing the heat dissipation fins or improving the shape of the heat dissipation fins (such as a cylinder head of a double-cylinder air-cooled motorcycle engine disclosed in a Chinese patent with the application number 2020219044426). However, the above methods can only improve the heat dissipation performance outside the cylinder head, and there is no significant improvement in the heat dissipation effect inside the cylinder head.

[0003] Since the cylinder head is located at the upper end of the combustion chamber and is provided with a spark plug assembly hole, in order to improve the ignition performance, the spark plug assembly hole is generally located in the middle of the cylinder head, resulting in the largest heat absorption in the middle of the cylinder head. The heat dissipation fins are arranged outside the cylinder head, and rapid heat dissipation cannot be achieved for the middle part of the cylinder head and the position near the combustion chamber. Based on this, there is an urgent need for a cylinder head that can quickly dissipate heat from the middle and lower parts of the cylinder head. Summary of the Invention

[0004] Aiming at the above-mentioned deficiencies existing in the prior art, the purpose of the utility model is to provide a cylinder head of a double-cylinder motorcycle engine with a cooling air duct, so as to solve the problem that the heat dissipation performance of the cylinder head of the existing double-cylinder motorcycle engine for the middle part of the cylinder head and the position near the combustion chamber is poor, affecting the service life of the cylinder head.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A cylinder head of a twin-cylinder motorcycle engine with a cooling air duct, comprising a cylinder head body and fin assemblies arranged on four sides of the cylinder head body. There are two spark plug assembly holes arranged in the cavity of the cylinder head body; a vertical air inlet channel is arranged between the two spark plug assembly holes, and a horizontal heat dissipation channel communicating with the air inlet channel and the two spark plug assembly holes is arranged at one end of the air inlet channel far from the air inlet. The end of the horizontal heat dissipation channel is placed on one side of the cylinder head body to form an air outlet, and the horizontal heat dissipation channel correspondingly covers the surface of the cylinder head body corresponding to the combustion chamber. In this way, after a vertical air inlet channel is arranged between the two spark plug assembly holes of the cylinder head body and a horizontal heat dissipation channel communicating with it is arranged below the air inlet channel, the external cold air enters the air inlet channel through the air inlet of the air inlet channel, then enters the horizontal heat dissipation channel, and the hot air in the cylinder head body is led out through the air outlet of the horizontal heat dissipation channel. The cooling air duct formed by the air inlet channel and the horizontal heat dissipation channel can cool the side of the spark plug assembly hole and the surface of the cylinder head body corresponding to the combustion chamber successively; and the fin assemblies are distributed on four sides of the cylinder head body, which can dissipate heat from the outside of the cylinder head. This way of double heat dissipation of the cylinder head by the fins combined with the cooling channel has a good heat dissipation effect and high pertinence, and can effectively improve the service life of the cylinder head. The air inlet channel is arranged between the two spark plug assembly holes, and the heat dissipation of the two spark plug assembly holes is balanced.

[0007] Further, the cross-section of the air inlet channel is rectangular, and the four corners are rounded, and the adjacent part of the air inlet channel and the horizontal heat dissipation channel is trumpet-shaped. In this way, by setting the air inlet channel as rectangular and the four corners as rounded, the side of the air inlet channel adjacent to the spark plug assembly hole is a plane and has a certain gap, which can maximize the heat transfer from the wall of the spark plug assembly hole to the inner wall of the air inlet channel, and after the external cold air enters the air inlet channel, it can take away the heat of the wall of the air inlet channel. And by setting the connection part of the air inlet channel and the horizontal heat dissipation channel as trumpet-shaped, the wind speed can be strengthened and the cooling effect can be increased.

[0008] Further, the air outlet of the horizontal heat dissipation channel gradually increases from inside to outside and is trumpet-shaped. In this way, when the air flows to the air outlet, the flow channel between the air and the external air gradually increases, so as to accelerate the export of hot air.

[0009] Further, the width of the air inlet channel corresponds to the aperture of the spark plug assembly hole, and the outer wall of the air inlet channel is connected to the wall of the corresponding side spark plug assembly hole. In this way, the air inlet channel corresponds to the spark plug assembly hole, which can further ensure that the air inlet channel can direct the heat of the wall of the spark plug assembly hole to the air inlet channel. The connection between the air inlet channel and the spark plug assembly hole can also increase the strength of the spark plug assembly hole.

[0010] Further, the heat sink assembly includes a plurality of vertically arranged heat sinks, and the thickness of each heat sink gradually decreases from inside to outside. In this way, the heat sinks are distributed on the four sides of the cylinder head body, and after the thickness gradually decreases, a form with a wider outer part and a narrower inner part is formed between adjacent heat sinks, so that the external cold air flows more rapidly and the heat dissipation effect is better. Brief Description of the Drawings

[0011] Figure 1 is a schematic three-dimensional structure diagram of a cylinder head of a twin-cylinder motorcycle engine in the embodiment;

[0012] Figure 2 is a top view of a cylinder head of a twin-cylinder motorcycle engine in the embodiment;

[0013] Figure 3 is Figure 2 a cross-sectional view taken along A-A in Detailed Description of the Embodiment

[0014] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the scope of protection of the present invention.

[0015] It should be noted that like reference numerals and letters refer to like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance. In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0016] Such as Figures 1 - 3As shown in the figure, the cylinder head of a double-cylinder motorcycle engine in this embodiment includes a cylinder head body 1 and fin assemblies 2 provided on four sides of the cylinder head body 1. There are two spark plug assembly holes 3 and a sprocket assembly hole in the cavity of the cylinder head body 1. The spark plug assembly holes 3 are located in the middle of the cylinder head body 1. A vertical air inlet channel 4 is provided between the two spark plug assembly holes 3 (a wind guiding duct that matches and communicates with the air inlet channel is provided on the cylinder head). At one end of the air inlet channel 4 away from the air inlet 41, a horizontal heat dissipation channel 5 that communicates with the air inlet channel 4 and the two spark plug assembly holes 3 is provided. The end of the horizontal heat dissipation channel 5 is placed on one side of the cylinder head body 1 to form an air outlet 51, and the horizontal heat dissipation channel 5 corresponds to and covers the surface of the cylinder head body 1 corresponding to the combustion chamber. In this way, after a vertical air inlet channel 4 is provided between the two spark plug assembly holes 3 of the cylinder head body 1 and a horizontal heat dissipation channel 5 communicating with it is provided below the air inlet channel 4, the external cold air enters the air inlet channel 4 through the air inlet of the air inlet channel 4, then enters the horizontal heat dissipation channel 5, and the hot air in the cylinder head body 1 is led out through the air outlet 51 of the horizontal heat dissipation channel 5. The cooling air duct formed by the air inlet channel 4 and the horizontal heat dissipation channel 5 can cool the side of the spark plug assembly hole 3 and the surface of the cylinder head body 1 corresponding to the combustion chamber successively. The fin assemblies 2 are distributed on four sides of the cylinder head body 1 and can dissipate heat from the outside of the cylinder head. This dual heat dissipation method of combining fins and cooling channels for the cylinder head has good heat dissipation effect and high pertinence, and can effectively improve the service life of the cylinder head. The air inlet channel 4 is provided between the two spark plug assembly holes 3, and the heat dissipation of the two spark plug assembly holes 3 is balanced.

[0017] As Figure 1 , Figure 2 shown in the figure, the cross-section of the air inlet channel 4 is rectangular, and the four corners are rounded. The adjacent part of the air inlet channel 4 and the horizontal heat dissipation channel 5 is trumpet-shaped. In this way, the air inlet channel 4 is set to be rectangular and the four corners are rounded, so that the side of the air inlet channel 4 adjacent to the spark plug assembly hole 3 is a plane and has a certain gap, which can maximize the heat transfer from the wall of the spark plug assembly hole 3 to the inner wall of the air inlet channel 4, and after the external cold air enters the air inlet channel 4, it can take away the heat of the wall of the air inlet channel 4. And setting the connection part of the air inlet channel 4 and the horizontal heat dissipation channel 5 to be trumpet-shaped can strengthen the wind speed and increase the cooling effect.

[0018] Furthermore, the air outlet 51 of the horizontal heat dissipation channel 5 gradually increases from inside to outside and is trumpet-shaped. In this way, when the air flows to the air outlet 51, the flow channel between the air and the external air gradually increases, so as to accelerate the export of hot air.

[0019] Further, the width of the air inlet passage 4 corresponds to the aperture of the spark plug assembly hole 3, and the outer wall of the air inlet passage 4 is in contact with the hole wall of the corresponding side of the spark plug assembly hole 3. In this way, the air inlet passage 4 corresponds to the spark plug assembly hole 3, which can further ensure that the heat of the hole wall of the spark plug assembly hole 3 is guided to the air inlet passage 4. The connection between the air inlet passage 4 and the spark plug assembly hole 3 can also increase the strength of the spark plug assembly hole 3.

[0020] Further, the heat sink assembly 2 includes a plurality of vertically arranged heat sinks, and the thickness of each heat sink gradually decreases from the inside to the outside. In this way, the heat sinks are distributed on the four sides of the cylinder head body 1, and after the thickness gradually decreases, a form with a wider outer part and a narrower inner part is formed between two adjacent heat sinks, so that the external cold air flows more quickly and the heat dissipation effect is better.

[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Those of ordinary skill in the art should understand that any modifications or equivalent replacements of the technical solutions of the present invention, without departing from the purpose and scope of the present technical solution, should be covered by the scope of the claims of the present invention.

Claims

1. A cylinder head of a double-cylinder motorcycle engine with a cooling air duct, comprising a cylinder head body and heat sink assemblies provided on four sides of the cylinder head body. Two spark plug assembly holes are provided in the cavity of the cylinder head body. It is characterized in that, A vertically arranged air inlet passage is provided between two spark plug assembly holes. At one end of the air inlet passage away from the air inlet, a horizontal heat dissipation passage connected to the air inlet passage is provided. The end of the horizontal heat dissipation passage is placed on one side of the cylinder head body to form an air outlet, and the horizontal heat dissipation passage correspondingly covers the surface of the cylinder head body corresponding to the combustion chamber.

2. The cylinder head of a twin-cylinder motorcycle engine with a cooling air duct according to claim 1, characterized in that, The cross-section of the air inlet passage is rectangular, and the four corners are rounded. The adjacent part of the air inlet passage and the horizontal heat dissipation passage is trumpet-shaped.

3. The cylinder head of a twin-cylinder motorcycle engine with a cooling air duct according to claim 1 or 2, characterized in that, The air outlet of the horizontal heat dissipation passage gradually increases from inside to outside and is trumpet-shaped.

4. The cylinder head of the twin-cylinder motorcycle engine with a cooling air duct according to claim 3, characterized in that, The width of the air inlet passage corresponds to the aperture of the spark plug assembly hole, and the outer wall of the air inlet passage is connected to the hole wall of the corresponding side spark plug assembly hole.

5. The cylinder head of a twin-cylinder motorcycle engine with a cooling air duct according to claim 1 or 2 or 4, characterized in that, The heat sink assembly includes a plurality of vertically arranged heat sinks, and the thickness of each heat sink gradually decreases from inside to outside.

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