Motorcycle air cooling cylinder head structure and cylinder head

Abstract

The utility model discloses an air-cooled cylinder head structure of a motorcycle, which comprises a cylinder head body, a camshaft chamber arranged at the front end of the cylinder head body, a combustion chamber dome arranged at the rear end of the cylinder head body, a transmission chamber arranged on one side of the cylinder head body, and an air flow channel arranged on one side of the cylinder head body back to the transmission chamber. A splitter plate is arranged in the air flow channel and can divide the air flow channel into an air outlet channel and a cooling channel, the end, facing the transmission cavity, of the air outlet channel extends to the upper end or the lower end of the cylinder head body to form an air inlet channel, and the cooling channel extends to the upper end or the lower end of the cylinder head body to form an air channel opening. The air channel opening and the air inlet end of the air inlet channel are located at the upper end and the lower end of the cylinder head body respectively. The utility model further discloses an air cylinder head, the temperature of the air cylinder head can be effectively reduced, and therefore the service life of an engine is prolonged. Damage of thermal stress to transmission parts is reduced, and the failure rate of equipment operation is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motorcycle engine accessories, in particular to a motorcycle air-cooled cylinder head structure and a cylinder head. Background Art

[0002] A motorcycle engine is a machine that ignites the fuel mixture that enters the cylinder, converts the heat energy generated by its combustion into mechanical energy, and transmits the power to the rear wheel of the motorcycle through the transmission mechanism via the crankshaft, thereby converting it into the driving force of the vehicle.

[0003] The cooling technology of motorcycle engines is mainly divided into two types: air cooling and water cooling. Water cooling technology dissipates heat by circulating coolant (usually water or ethylene glycol). This technology uses a complete water tank and water circulation system to circulate the coolant inside the engine, absorbing and taking away the heat generated by the engine to achieve the purpose of cooling. The main configuration of a water-cooled engine includes a water pump, a water tank temperature control, and a fan. When the temperature is high, the throttle valve will open all the water tanks to start working, and when the temperature is too high, the fan will turn on to cool down to the optimal operating temperature of the engine. The heat dissipation efficiency of the water cooling system is usually higher than that of the air cooling system, and it can maintain a stable working state under higher loads and longer periods of high-intensity driving. In addition, the water cooling system can also ensure that the oil does not cool prematurely before achieving proper lubrication through the adjustment of the throttle valve, so that the motorcycle can perform well under various environmental conditions. However, the cooling system of the water cooling system is relatively complex and requires more components such as pipes and pumps, so the overall weight and volume may be greater than that of an air-cooled motorcycle. In addition, the water cooling system requires regular replacement of the coolant and inspection of the working condition of the cooling system, and the maintenance cost is relatively high.

[0004] Air cooling technology mainly dissipates heat through air convection. When the motorcycle is running, the air passes through the heat sink outside the cylinder head to take away the heat inside the cylinder. A cooling air duct is also set up in the cylinder head to assist in heat dissipation. The design of the cooling air duct is one of the important factors to ensure the performance and life of the engine. The heat generated by the engine during operation and the heat dissipation requirements of different parts (such as the cylinder head, valves, spark plugs, etc.) determine the number and layout of the cooling air duct. The layout of the cooling air duct should ensure that the cooling airflow can take away as much heat from the cylinder head as possible, especially the high temperature around the dome of the combustion chamber, which will be radiated to the crankshaft and transmission mechanism through heat transfer. Excessive temperature will not only increase the failure rate of the engine, but also reduce its service life. Utility Model Content

[0005] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the utility model is: how to provide a motorcycle air-cooled cylinder head structure that improves the heat dissipation effect of the engine cylinder head, reduces the engine operation failure rate caused by high temperature, and can extend the engine working life.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A motorcycle air-cooled cylinder head structure comprises a cylinder head body, a camshaft chamber is arranged at the front end of the cylinder head body, a combustion chamber dome is arranged at the rear end of the cylinder head body, a transmission chamber is arranged on one side of the cylinder head body in the left and right directions, an air flow channel is arranged on the side of the cylinder head body facing away from the transmission chamber, the air flow channel extends through the position between the combustion chamber dome and the camshaft chamber and extends close to the transmission chamber, a splitter is arranged in the air flow channel, and the splitter extends from one end of the air flow channel in the direction of the transmission chamber to the other end of the air flow channel, so that the splitter can The air flow channel is split to form an outlet air channel and a cooling air channel. The end of the outlet air channel facing the direction of the transmission chamber extends to the top or bottom of the cylinder head body to form an intake air channel. The end of the intake air channel away from the outlet air channel has an intake end that can intake air toward the front of the cylinder head body. The end of the cooling air channel facing the direction of the transmission chamber extends to the bottom or top of the cylinder head body. The end of the cooling air channel facing the top or bottom of the cylinder head body has an air channel opening connected to the outside. The intake end of the intake air channel and the air channel opening of the cooling air channel are respectively located at the upper and lower ends of the cylinder head body.

[0008] In the utility model, the front end of the cylinder head body is the windward surface, so that when the motorcycle is riding, the intake end of the intake air duct can take in air. The combustion chamber dome on the cylinder head body serves as the heat source of the engine, and the heat generated by it is transferred to the transmission chamber and the camshaft chamber through the cylinder body. Since the exhaust air duct and the cooling air duct extend and are close to the position of the transmission chamber, the air coming in from the intake air duct can dissipate heat around the transmission chamber; after the air enters the exhaust air duct and is discharged through the exhaust air duct, the exhaust air duct can dissipate heat around the camshaft chamber, so that most of the heat that should be transferred to the camshaft chamber and the transmission chamber can be taken away, and the influence of high temperature on the power transmission structure in the camshaft chamber and the transmission chamber can be reduced. In addition, when the motorcycle is riding, the air flow quickly flows through the surface of the cylinder head body, so the pressure at the air duct opening position of the cooling air duct will be reduced, and the hot air flow in the cooling air duct will be discharged, further improving the efficiency of cooling the cylinder head. In addition, the manifold can also increase the structural strength and prevent the cross-sectional area of ​​the gas flow channel from being too large, which may lead to a reduction in the strength of the cylinder head body.

[0009] As an optimization, an air intake box for accommodating the air intake end of the air intake passage is formed at a position corresponding to the air intake end of the air intake passage on the cylinder head body, and an air intake port is arranged at the front end of the air intake box, and the projection of the air intake port of the air intake box along the front-back direction of the cylinder head body is located outside the projection of the cylinder head body along the front-back direction of the cylinder head body. The air intake box arranged in an outward projection can effectively reduce the weight of the entire cylinder head body, and can also prevent the air intake port from being blocked by the cylinder head, thereby ensuring smooth air intake.

[0010] As an optimization, the inner bottom surface of the air inlet box is inclined and can make water flow to the drainage surface outside the air inlet box. Even if rainwater enters the air inlet box, it will be discharged along the drainage surface of the inner bottom surface of the air inlet box.

[0011] As an optimization, two valve holes connected to the inner side of the combustion chamber dome are pierced on the cavity wall of the camshaft chamber, the airflow channel passes through the position between the two valve holes, and a mounting hole connected to the airflow channel is recessed on the side of the cylinder head body corresponding to the position of the airflow channel, and a spark plug hole connected to the inner side of the combustion chamber dome is pierced at the mounting hole. The heat around the valve hole can also be taken away by the airflow channel, which can avoid the influence of high temperature on the control of the throttle valve; in addition, installing the spark plug at the position of the mounting hole can also have a good cooling effect on the spark plug, so that the resistance value of the spark plug remains stable, thereby ensuring that its ignition efficiency will not be attenuated due to the high temperature of the cylinder head.

[0012] As an optimization, the side walls of the outlet air passage and the cooling air passage at the middle position in the length direction thereof are respectively protruded toward the direction where the splitter plate is located to form a protrusion. The protrusion can reduce the cross-sectional area of ​​the air passage where it is located. According to Bernoulli's principle, when the fluid passes through a region with a reduced cross-sectional area, in order to maintain mass conservation, the velocity of the fluid must increase, that is, the cooling effect on the cylinder head body can be further improved.

[0013] As an optimization, a plurality of heat dissipation fins are formed on the outer side surface of the cylinder head body. The heat dissipation fins arranged outside the cylinder head body can accelerate the heat dissipation capacity of the cylinder head body.

[0014] The utility model also discloses a motorcycle engine cylinder head, comprising the above-mentioned motorcycle air-cooled cylinder head structure.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the utility model effectively reduces the cylinder head temperature through the layout of the air flow channel, thereby extending the service life of the engine; in addition, it reduces the high temperature impact on the camshaft chamber and the transmission chamber, reduces the damage of thermal stress to the transmission components, and reduces the failure rate of equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the oblique front side of the utility model;

[0017] Figure 2 It is a schematic diagram of the three-dimensional structure of the oblique rear side of the utility model;

[0018] Figure 3 It is a cross-sectional view of the utility model. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiment of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0020] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when used, which is only for the convenience of describing the 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 therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", etc. do not mean that the components are absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] like Figures 1 to 3As shown, the motorcycle air-cooled cylinder head structure in this specific embodiment includes a cylinder head body 1, a camshaft chamber 2 is arranged at the front end of the cylinder head body 1, a combustion chamber dome 3 is arranged at the rear end of the cylinder head body 1, a transmission chamber 4 is arranged on one side of the left and right directions of the cylinder head body 1, and an air flow channel is arranged on the side of the cylinder head body 1 facing away from the transmission chamber 4, the air flow channel extends through the position between the combustion chamber dome 3 and the camshaft chamber 2 and extends close to the transmission chamber 4, and a diverter plate 5 is arranged in the air flow channel, and the diverter plate 5 extends from one end of the air flow channel toward the direction of the transmission chamber 4 to the other end of the air flow channel, so that the diverter plate 5 can split the air flow channel to form an outlet air channel 6 and a cooling air channel 7. The outlet air channel 6 extends from one end thereof in the direction of the transmission chamber 4 to the top or bottom of the cylinder head body 1 to form an intake air channel 8. The intake air channel 8 has an intake end that can take in air toward the front of the cylinder head body 1 at one end thereof away from the outlet air channel 6. The cooling air channel 7 extends from one end thereof in the direction of the transmission chamber 4 to the bottom or top of the cylinder head body 1. The cooling air channel 7 has an air channel opening 9 that is connected to the outside at one end thereof that is located at the top or bottom of the cylinder head body 1. The intake end of the intake air channel 8 and the air channel opening 9 of the cooling air channel 7 are respectively located at the upper and lower ends of the cylinder head body 1.

[0022] In this specific embodiment, a protrusion is formed on the cylinder head body 1 at a position corresponding to the air intake end of the air intake duct 8, and an air intake box 10 is used to accommodate the air intake end of the air intake duct 8 therein. An air intake port is provided at the front end of the air intake box 10, and the projection of the air intake port of the air intake box 10 along the front-to-back direction of the cylinder head body 1 is located outside the projection of the cylinder head body 1 along the front-to-back direction of the cylinder head body 1.

[0023] In this specific embodiment, the inner bottom surface of the air intake box 10 is inclined and can allow water to flow to the drainage surface outside the air intake box 10 .

[0024] In this specific embodiment, two valve holes 11 connected to the inner side of the combustion chamber dome 3 are formed on the cavity wall of the camshaft chamber 2, and the air flow channel passes through the position between the two valve holes 11. A mounting hole 12 connected to the air flow channel is recessed on the side of the cylinder head body 1 corresponding to the position of the air flow channel, and a spark plug hole 13 connected to the inner side of the combustion chamber dome 3 is formed at the mounting hole 12.

[0025] In this specific embodiment, the side walls of the outlet air passage 6 and the cooling air passage 7 located at the middle position in the length direction thereof are respectively protruded toward the direction where the diverter plate 5 is located to form a protrusion.

[0026] In this specific embodiment, a plurality of heat dissipation fins 14 are protruded and formed on the outer side surface of the cylinder head body 1 .

[0027] A motorcycle engine cylinder head comprises the above-mentioned motorcycle air-cooled cylinder head structure.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit the technical solution. Ordinary technicians in this field should understand that those modifications or equivalent replacements of the technical solution of the utility model without departing from the purpose and scope of the technical solution of the utility model should be included in the scope of the claims of the utility model.

Claims

1. A motorcycle air-cooled cylinder head structure, comprising a cylinder head body, a camshaft chamber is arranged at the front end of the cylinder head body, a combustion chamber dome is arranged at the rear end of the cylinder head body, and a transmission chamber is arranged on one side of the cylinder head body in the left and right directions, characterized in that: An air flow channel is provided on the side of the cylinder head body facing away from the transmission chamber, and the air flow channel extends through a position between the combustion chamber dome and the camshaft chamber and extends close to the transmission chamber. A diverter plate is provided in the air flow channel, and the diverter plate extends from one end of the air flow channel facing the direction of the transmission chamber to the other end of the air flow channel, so that the diverter plate can divert the air flow channel to form an outlet air channel and a cooling air channel. The end of the outlet air channel facing the direction of the transmission chamber extends to the top or bottom of the cylinder head body to form an intake air channel, and the end of the intake air channel away from the outlet air channel has an intake end that can intake air toward the front of the cylinder head body, and the end of the cooling air channel facing the direction of the transmission chamber extends to the bottom or top of the cylinder head body, and the end of the cooling air channel facing the top or bottom of the cylinder head body has an air channel opening connected to the outside world, and the intake end of the intake air channel and the air channel opening of the cooling air channel are respectively located at the upper and lower ends of the cylinder head body.

2. The air-cooled cylinder head structure for motorcycle according to claim 1, characterized in that: An air intake box for accommodating the air intake end of the air intake duct is formed at a position protrusion on the cylinder head body corresponding to the air intake end of the air intake duct, and an air intake port is arranged at the front end of the air intake box. The projection of the air intake port of the air intake box along the front-to-back direction of the cylinder head body is located outside the projection of the cylinder head body along the front-to-back direction of the cylinder head body.

3. The air-cooled cylinder head structure for motorcycle according to claim 2, characterized in that: The inner bottom surface of the air inlet box is inclined and can allow water to flow to the drainage surface outside the air inlet box.

4. The air-cooled cylinder head structure for motorcycle according to claim 1, characterized in that: The wall of the camshaft chamber is provided with two valve holes connected to the inner side of the combustion chamber dome, the air flow channel passes through a position between the two valve holes, a mounting hole connected to the air flow channel is recessed on the side of the cylinder head body corresponding to a position of the air flow channel, and a spark plug hole connected to the inner side of the combustion chamber dome is penetrated at the mounting hole.

5. The air-cooled cylinder head structure for motorcycle according to claim 1, characterized in that: The side walls of the outlet air passage and the cooling air passage respectively located at the middle position in the length direction thereof are convex toward the direction where the diverter plate is located to form a convex portion.

6. The air-cooled cylinder head structure for motorcycle according to claim 1, characterized in that: A plurality of heat dissipation fins are protruded and formed on the outer side surface of the cylinder head body.

7. A cylinder head, characterized in that: The invention comprises the motorcycle air-cooled cylinder head structure as claimed in any one of claims 1 to 6.

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