Cylinder head of motorcycle

Abstract

The present invention provides a cylinder head for a motorcycle, belonging to the technical field of motorcycles. It solves the technical problem that the existing cylinder head has insufficient heat dissipation effect. The cylinder head of the motorcycle includes a cylinder head body, the cylinder head body is provided with a cooling air duct, the inlet end and the outlet end of the cooling air duct are respectively located on different sides of the cylinder head body, the top of the cylinder head body is provided with an oil outlet, the top of the cylinder head body is also provided with an oil cooling part, the cylinder head body is provided with an annular vertical edge arranged around the circumference of the oil cooling part, the surface of the oil cooling part is provided with an oil collecting groove which is concave downward and can allow the oil flowing out of the oil outlet to flow into, and the oil collecting groove and the cooling air duct are separated by a heat-conducting thin wall. The heat dissipation effect of the cylinder head of the motorcycle is better, which is conducive to ensuring the stable operation of the engine.

Description

Technical Field

[0001] The invention belongs to the technical field of motorcycles and relates to a cylinder head of a motorcycle. Background Art

[0002] The cylinder head, also known as the cylinder head, is installed on the cylinder body, sealing the cylinder from the top and forming the combustion chamber. It is often in contact with high-temperature and high-pressure fuel gas, so it bears a large thermal and mechanical load, so it needs to be cooled. The cylinder head of a motorcycle engine is often cooled by air cooling with heat sinks on the periphery of the cylinder head.

[0003] The patent with authorization announcement number CN202732129U discloses a low-noise motorcycle OHV engine cylinder head, including a cylinder head body and heat sinks extending outward from the surface of the cylinder head body. According to the ray direction of the center of the cylinder head, the maximum width from the root to the top of the heat sink does not exceed 2.7 cm, and the gaps between the heat sinks are provided with reinforcing ribs connecting adjacent heat sinks; the cylinder head is provided with a ventilation duct that passes through the cylinder head.

[0004] The above cylinder head is cooled by setting a ventilation duct, which improves the heat dissipation and cooling effect of the cylinder head. However, due to the size of the cylinder head, the air intake volume is still difficult to meet the cylinder head heat dissipation requirements of a high-horsepower engine. Therefore, technicians in this field can easily consider: 1. Increase the inner diameter of the ventilation duct to increase the air volume; 2. Set a fan structure to increase the wind speed, etc. Summary of the invention

[0005] The present invention aims at the above-mentioned problems existing in the prior art and provides a cylinder head for a motorcycle. The technical problem to be solved by the present invention is: how to improve the heat dissipation effect of the cylinder head.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A cylinder head of a motorcycle comprises a cylinder head body, wherein the cylinder head body is provided with a cooling air duct, wherein the inlet end and the outlet end of the cooling air duct are respectively located on different sides of the cylinder head body, and the top of the cylinder head body is provided with an oil outlet. The invention is characterized in that the top of the cylinder head body is also provided with an oil cooling portion, the cylinder head body is provided with an annular vertical edge circumferentially arranged around the oil cooling portion, the surface of the oil cooling portion is provided with an oil collecting groove which is recessed downward and into which the engine oil flowing out of the oil outlet can flow, and the oil collecting groove is separated from the cooling air duct by a heat-conducting thin wall.

[0008] The cylinder head body can be sealed with the cylinder block to form a cylinder and a complete combustion chamber. A cooling air duct with an inlet end and an outlet end located on different sides of the cylinder head body is arranged in the cylinder head body, so that the outside air enters the high-temperature area in the cylinder head body from the inlet end of the cooling air duct and absorbs the heat of the cylinder head body and then flows out from the outlet end on the other side of the cylinder head body to take away the heat, thereby achieving a cooling effect. The oil outlet can flow out the engine oil. For example, the oil outlet can be located at the friction pair at the top of the cylinder head body where the engine oil can seep out, or the oil outlet can be formed as an engine oil spray outlet, so as to provide lubrication for the rocker arm friction pair or the camshaft friction pair. By arranging an oil cooling part at the top of the cylinder head body, arranging an annular vertical edge on the outer periphery of the oil cooling part, and arranging a downwardly concave oil collecting groove on the surface of the oil cooling part, The engine oil flowing out of the oil outlet can flow into the oil collecting groove, and a heat-conducting thin wall is provided between the inner wall of the oil collecting groove and the inner wall of the cooling air duct, so that the annular vertical edge forms a constraint on the engine oil flowing out of the oil outlet, so that the engine oil continuously flows into the oil collecting groove. A certain volume of engine oil collected in the oil collecting groove can continuously and directly absorb the heat of the cylinder head body. After the engine oil in the oil collecting groove overflows, it can flow back downward to take away the absorbed heat, thereby ensuring that the engine oil continuously absorbs heat and further improving the heat dissipation effect. At the same time, the engine oil in the oil collecting groove can also exchange heat with the airflow in the cooling air duct through the heat-conducting thin wall, so that the engine oil at this location can be cooled when the oil temperature is too high, thereby avoiding excessive heat accumulation of the engine oil when the system circulation is weak and affecting the quality, thereby ensuring stable engine operation.

[0009] In the cylinder head of the above motorcycle, the oil cooling part has a rocker mounting seat for mounting the rocker arm and the camshaft, the oil outlet is located on the rocker mounting seat, and the oil collection groove is located below the rocker mounting seat. The rocker mounting seat is used to mount the rocker arm that controls the opening and closing of the throttle valve and the camshaft that controls the swing of the rocker arm. The rotating friction pairs of the rocker arm and the camshaft both require oil lubrication. The oil outlet is arranged on the rocker mounting seat to facilitate oil collection while ensuring the lubrication effect. The oil collection groove is located below the rocker mounting seat to ensure that the oil can flow into the oil collection groove after flowing out, so that the low-temperature oil flowing out can absorb heat in the oil collection groove, thereby improving the heat dissipation effect.

[0010] In the cylinder head of the motorcycle, the inner wall of the oil collecting groove has a protruding heat dissipation rib plate, which can increase the contact area between the oil in the oil collecting groove and the surface of the cylinder head body, improve the heat exchange effect, and make the oil fully absorb heat.

[0011] In the cylinder head of the above-mentioned motorcycle, the top of the cylinder head body within the annular vertical edge has a vertically penetrating chain cavity, and the top surface of the cylinder head body has a guide surface extending from the open edge of the oil collecting groove to the open edge of the chain cavity, and the oil overflowing from the oil collecting groove can flow into the chain cavity along the guide surface. The chain cavity is used to accommodate the transmission chain driving the camshaft. The chain cavity belongs to the existing structure and its lower end can be connected to the engine oil pan. In this way, the oil in the oil collecting groove flows into the chain cavity along the guide surface when overflowing, and then is driven by the oil pump to circulate, realizing the circulation and flow of the oil in the oil collecting groove, thereby ensuring the temperature of the oil and the continuous heat dissipation effect.

[0012] In the cylinder head of the motorcycle, the bottom surface of the cylinder head body has a combustion chamber, the cylinder head body has an exhaust passage whose inlet end is connected to the combustion chamber, the outlet end of the cooling air passage is adjacent to the outlet end of the exhaust passage and both are located on the same side of the cylinder head body. The combustion chamber can be enclosed with the inner cavity of the cylinder body to form a complete combustion chamber, and the exhaust passage discharges the exhaust gas after combustion in the combustion chamber. This area has a very high temperature, so the air in the cooling air passage can absorb more heat when discharged in this area, thereby improving the heat exchange and heat dissipation effect.

[0013] In the cylinder head of the motorcycle, the outlet end of the cooling air duct is located directly below the guide surface, so that the oil flowing through the guide surface can help absorb and take away the heat of the high-temperature area, further improving the heat dissipation effect.

[0014] In the cylinder head of the motorcycle, the inner wall of the cooling air duct has a guide surface which is arranged obliquely and can guide the airflow to the outlet end of the cooling air duct. The guide surface is arranged along the direction of the inlet end of the cooling air duct and is opposite to the outlet end of the cooling air duct. The guide surface is located on the heat-conducting thin wall. In this way, the high-speed airflow will directly impact the guide surface after entering the cooling air duct, so that the airflow can more directly exchange heat with the oil in the oil collection groove on the other side of the heat-conducting thin wall, ensuring the heat exchange effect and avoiding excessive oil temperature. In addition, the depth of the oil collection groove is greater, which improves the heat absorption and regulation capacity of the oil, and the bottom surface of the oil collection groove is also closer to the position of the combustion chamber, which is conducive to improving the efficiency of heat exchange and conduction.

[0015] In the cylinder head of the above motorcycle, the rocker arm mounting seat has a rocker arm shaft hole for mounting the rocker arm shaft, and the oil outlet is located at the end of the rocker arm shaft hole. The rotating shaft of the rocker arm is installed in the rocker arm shaft hole, so that the pressurized oil flows out from the oil outlet formed by the inner wall of the rocker arm shaft hole and the rocker arm shaft, ensuring smooth circulation of the oil.

[0016] In the cylinder head of the motorcycle, the inner wall of the cooling air duct inlet end has a connecting rib plate arranged in the up-down direction, and the upper and lower sides of the connecting rib plate are connected to the inner wall of the cooling air duct. In this way, the connecting rib plate can conduct the heat from the lower area close to the combustion chamber upward, so that the airflow enters the cooling air duct and the heat exchange is more uniform, and the heat exchange area is also larger, thereby improving the overall heat dissipation effect.

[0017] In the cylinder head of the motorcycle, the side of the cylinder head body has a socket for installing the spark plug, and the connecting rib is located directly above the socket. The outer end of the spark plug will extend out of the socket, so that the connecting rib is located in the leeward area behind the outer end of the spark plug, which improves the heat conduction and heat exchange effect without affecting the original airflow direction at the inlet end of the cooling air duct.

[0018] Compared with the prior art, the advantages of the present invention are as follows:

[0019] The annular vertical edge in the cylinder head of the motorcycle constrains the oil flowing out of the oil outlet, so that the oil can continuously flow into the oil collecting groove. A certain volume of oil collected in the oil collecting groove can continuously and directly absorb the heat of the cylinder head body. After the oil in the oil collecting groove overflows, it can flow back downward to take away the absorbed heat, thereby ensuring that the oil continuously absorbs heat and further improving the heat dissipation effect. At the same time, the oil in the oil collecting groove can also exchange heat with the airflow in the cooling air duct through the heat-conducting thin wall, so that the oil at this location can be cooled when the oil temperature is too high, thereby avoiding excessive heat accumulation of the oil when the system circulation is weak and affecting the quality, thereby ensuring stable operation of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of this embodiment.

[0021] Figure 2 2 is a schematic diagram of the side structure of this embodiment.

[0022] Figure 3 yes Figure 2 Schematic diagram of the AA section structure.

[0023] Figure 4 yes Figure 2 Schematic diagram of the BB cross-section structure.

[0024] Figure 5 It is a schematic diagram of the longitudinal cross-section structure of this embodiment in cooperation with the rocker arm.

[0025] Figure 6 yes Figure 5 Enlarged view of section C in .

[0026] Figure 7 It is a schematic diagram of the three-dimensional structure from another angle of this embodiment.

[0027] In the figure, 1, cylinder head body; 10, oil cooling part; 11, annular vertical edge; 12, oil collecting groove; 121, heat dissipation rib plate; 13, heat-conducting thin wall; 14, rocker arm mounting seat; 141, rocker arm shaft hole; 15, chain cavity; 16, guide surface; 17, combustion chamber; 18, exhaust channel; 19, jack;

[0028] 2. Cooling air duct; 21. Connecting rib plate; 22. Guide surface;

[0029] 3. Oil outlet. DETAILED DESCRIPTION

[0030] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0031] like Figure 1-7As shown, the cylinder head of the motorcycle includes a cylinder head body 1, and a horizontally arranged cooling air duct 2 is provided in the cylinder head body 1. The inlet end and the outlet end of the cooling air duct 2 are respectively located on adjacent sides of the cylinder head body 1. The top of the cylinder head body 1 is provided with an oil outlet 3, and the top of the cylinder head body 1 is also provided with an oil cooling part 10. The cylinder head body 1 is provided with an annular vertical edge 11 circumferentially arranged around the oil cooling part 10. The top surface of the cylinder head body 1 within the annular vertical edge 11 is provided with an oil collecting groove 12 which is recessed downward and allows the oil flowing out of the oil outlet 3 to flow into. The oil collecting groove 12 is separated from the cooling air duct 2 by a heat-conducting thin wall 13. The cylinder head body 1 can be sealed with the cylinder body to form a cylinder and a complete combustion chamber. A cooling air duct 2 is horizontally arranged in the cylinder head body 1, and the inlet end and the outlet end of the cooling air duct 2 are respectively located on different sides of the cylinder head body 1, so that the outside air enters the high-temperature area in the cylinder head body 1 from the inlet end of the cooling air duct 2 and absorbs the heat of the cylinder head body 1, and then flows out from the outlet end on the other side of the cylinder head body 1 to take away the heat, thereby achieving a cooling effect. The oil outlet 3 can flow out the engine oil to provide lubrication for the rocker arm friction pair and the camshaft friction pair; an oil cooling part 10 is arranged on the top of the cylinder head body 1, and an annular vertical edge 11 is arranged around the outer periphery of the oil cooling part 10, and a downwardly concave oil collecting groove 12 is arranged on the top surface of the cylinder head body 1 inside the annular vertical edge 11, so that the engine oil flowing out of the oil outlet 3 can flow The oil flows into the oil collecting groove 12, and a heat-conducting thin wall 13 is provided between the inner wall of the oil collecting groove 12 and the inner wall of the cooling air duct 2 to separate them. In this way, the annular vertical edge 11 constrains the oil flowing out of the oil outlet 3, so that the oil continuously flows into the oil collecting groove 12. A certain volume of oil collected in the oil collecting groove 12 can continuously and directly absorb the heat of the cylinder head body 1. After the oil in the oil collecting groove 12 overflows, it can flow back downward to take away the absorbed heat, ensuring that the oil continues to absorb heat and further improving the heat dissipation effect; at the same time, the oil in the oil collecting groove 12 can also exchange heat with the airflow in the cooling air duct 2 through the heat-conducting thin wall 13, and cool the oil at this location when the oil temperature is too high, so as to avoid excessive heat accumulation of the oil when the system circulation is weak and affect the quality, and ensure the stable operation of the engine. Specifically, the oil cooling part 10 has a rocker arm mounting seat 14 for mounting the rocker arm and the camshaft, the oil outlet 3 is located on the rocker arm mounting seat 14, and the oil collecting groove 12 is located below the rocker arm mounting seat 14. The rocker arm mounting seat 14 is used to install the rocker arm that controls the opening and closing of the throttle valve and the camshaft that controls the swing of the rocker arm. The rotating friction pairs of the rocker arm and the camshaft both require oil lubrication. The oil outlet 3 is arranged on the rocker arm mounting seat 14 to facilitate oil collection while ensuring the lubrication effect. The oil collection groove 12 is located below the rocker arm mounting seat 14 to ensure that the oil can flow into the oil collection groove 12 after flowing out, so that the low-temperature oil flowing out can absorb heat in the oil collection groove 12, thereby improving the heat dissipation effect. The rocker arm mounting seat 14 has a rocker arm shaft hole 141 for installing the rocker arm shaft, and the oil outlet 3 is located at the end of the rocker arm shaft hole 141. The rotating shaft of the rocker arm is installed in the rocker arm shaft hole 141, so that the pressurized oil flows out from the oil outlet 3 formed by the inner wall of the rocker arm shaft hole 141 and the rocker arm shaft, ensuring smooth circulation of the oil.The inner wall of the oil collecting groove 12 has two protruding heat dissipation ribs 121. In this way, the heat dissipation ribs 121 can increase the contact area between the oil in the oil collecting groove 12 and the surface of the cylinder head body 1, improve the heat exchange effect, and allow the oil to fully absorb heat. The oil cooling part 10 has a vertically penetrating chain cavity 15, and the top surface of the cylinder head body 1 has a guide surface 16 extending from the open edge of the oil collecting groove 12 to the open edge of the chain cavity 15. The oil overflowing from the oil collecting groove 12 can flow into the chain cavity 15 along the guide surface 16. The chain cavity 15 is used to accommodate the transmission chain that drives the camshaft. The chain cavity 15 belongs to the existing structure and its lower end can be connected to the engine oil pan. In this way, when the oil in the oil collecting groove 12 overflows, it flows into the chain cavity 15 along the guide surface 16, and then is driven by the oil pump to circulate, realizing the circulation and flow of the oil in the oil collecting groove 12, thereby ensuring the temperature of the oil and the continuous heat dissipation effect. The position of the cooling air duct 2 is opposite to the inner side wall of the oil collecting groove 12 in the horizontal direction. The inner wall of the cooling air duct 2 has a guide surface 22 which is inclined and can guide the airflow to the outlet end of the cooling air duct 2. The guide surface 22 is opposite to the outlet end of the cooling air duct 2 along the direction of the inlet end of the cooling air duct 2. The guide surface 22 is located on the heat-conducting thin wall 13. In this way, the depth of the oil collecting groove 12 is greater, and the heat absorption and regulation capacity of the engine oil is improved. In addition, the bottom surface of the oil collecting groove 12 is also closer to the position of the combustion chamber, which is conducive to improving the efficiency of heat exchange and conduction.

[0032] like Figure 1-5 , Figure 7 As shown, the bottom surface of the cylinder head body 1 has a combustion chamber 17, and the cylinder head body 1 has an exhaust channel 18 whose inlet end is connected to the combustion chamber 17. The outlet end of the cooling air duct 2 is adjacent to the outlet end of the exhaust channel 18 and both are located on the same side of the cylinder head body 1. The exhaust channel 18 discharges the exhaust gas after combustion in the combustion chamber 17. This area has a very high temperature, so that the air in the cooling air duct 2 can absorb more heat when discharged in this area, thereby improving the heat exchange and heat dissipation effect. Further, the outlet end of the cooling air duct 2 is located directly below the guide surface 16. In this way, the engine oil flowing through the guide surface 16 can help absorb and take away the heat from the high-temperature area, further improving the heat dissipation effect. The inner wall of the inlet end of the cooling air duct 2 has a connecting rib plate 21 arranged in the upper and lower directions. The upper and lower sides of the connecting rib plate 21 are connected to the inner wall of the cooling air duct 2 and divide the inlet of the cooling air duct 2 into two left and right areas. In this way, the connecting rib plate 21 can transfer the heat from the lower area near the combustion chamber 17 upward, so that the heat exchange is more uniform after the airflow enters the cooling air duct 2, and the heat exchange area is also larger, thereby improving the overall heat dissipation effect. The side of the cylinder head body 1 has a socket 19 for installing the spark plug, and the connecting rib plate 21 is located directly above the socket 19. The outer end of the spark plug will extend out of the socket 19, so that the connecting rib plate 21 is just located in the leeward area behind the outer end of the spark plug, which improves the heat conduction and heat exchange effect without affecting the original airflow direction at the inlet end of the cooling air duct 2.

[0033] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A cylinder head for a motorcycle, comprising a cylinder head body (1), wherein the cylinder head body (1) has a cooling air duct (2), wherein an inlet end and an outlet end of the cooling air duct (2) are respectively located on different sides of the cylinder head body (1), and the top of the cylinder head body (1) has an oil outlet (3), wherein: The top of the cylinder head body (1) also has an oil cooling portion (10), and the cylinder head body (1) has an annular vertical edge (11) arranged around the circumference of the oil cooling portion (10). The surface of the oil cooling portion (10) has an oil collecting groove (12) which is concave downward and allows the oil flowing out of the oil outlet (3) to flow into. The oil collecting groove (12) is separated from the cooling air duct (2) by a heat-conducting thin wall (13).

2. The cylinder head of a motorcycle according to claim 1, characterized in that: The oil cooling part (10) is provided with a rocker arm mounting seat (14) for mounting a rocker arm and a camshaft, the oil outlet (3) is located on the rocker arm mounting seat (14), and the oil collecting groove (12) is located below the rocker arm mounting seat (14).

3. The cylinder head of a motorcycle according to claim 1, characterized in that: The inner wall of the oil collecting groove (12) has a protruding heat dissipation rib plate (121).

4. The cylinder head of a motorcycle according to claim 1, 2 or 3, characterized in that: The oil cooling portion (10) is provided with a vertically penetrating chain cavity (15), and the top surface of the cylinder head body (1) is provided with a guide surface (16) extending from the open edge of the oil collecting groove (12) to the open edge of the chain cavity (15), and the oil overflowing from the oil collecting groove (12) can flow into the chain cavity (15) along the guide surface (16).

5. The cylinder head of a motorcycle according to claim 4, characterized in that: The bottom surface of the cylinder head body (1) has a combustion chamber (17), and the cylinder head body (1) has an exhaust passage (18) whose inlet end is connected to the combustion chamber (17); the outlet end of the cooling air duct (2) is adjacent to the outlet end of the exhaust passage (18) and both are located on the same side of the cylinder head body (1).

6. The cylinder head of a motorcycle according to claim 5, characterized in that: The outlet end of the cooling air duct (2) is located directly below the guide surface (16).

7. The cylinder head of a motorcycle according to claim 1, 2 or 3, characterized in that: The inner wall of the cooling air duct (2) has a guide surface (22) which is arranged obliquely and can guide the airflow to the outlet end of the cooling air duct (2); the guide surface (22) is arranged along the direction of the inlet end of the cooling air duct (2) and is opposite to the outlet end of the cooling air duct (2); the guide surface (22) is located on the heat-conducting thin wall (13).

8. The cylinder head of a motorcycle according to claim 2, characterized in that: The rocker arm mounting seat (14) is provided with a rocker arm shaft hole (141) for mounting a rocker arm shaft, and the oil outlet (3) is located at the end of the rocker arm shaft hole (141).

9. The cylinder head of a motorcycle according to claim 1, 2 or 3, characterized in that: The inner wall of the inlet end of the cooling air duct (2) has a connecting rib plate (21) arranged in the upper and lower directions, and the upper and lower side edges of the connecting rib plate (21) are connected to the inner wall of the cooling air duct (2).

10. The cylinder head of a motorcycle according to claim 9, characterized in that: The side surface of the cylinder head body (1) is provided with a plug hole (19) for installing a spark plug, and the connecting rib plate (21) is located directly above the plug hole (19).

Images