Motorcycle engine secondary air supply structure with cylinder head cooling function

Abstract

The utility model discloses a motorcycle engine secondary air supply structure with a cylinder head cooling function. The motorcycle engine secondary air supply structure comprises an air supply channel, a secondary air supply valve and heat dissipation fins. A cylinder head is arranged on the motorcycle engine, a cylinder head inner cavity is formed in the cylinder head, a cylinder head exhaust channel is formed in the cylinder head, an exhaust valve of the engine is arranged at the position of the cylinder head, and when the exhaust valve is opened, engine combustion waste gas can be exhausted to the cylinder head exhaust channel from the exhaust valve and exhausted out of the cylinder head from the cylinder head exhaust channel. One end of the air supply channel is communicated to the cylinder head exhaust channel, extends for a certain length along the side wall of the cylinder head and then penetrates through the outside of the cylinder head; the secondary gulp valve is arranged in the gas supplementing channel and is used for enabling the gas supplementing channel to perform one-way gas feeding towards the cylinder head exhaust channel under the action of pressure difference; the heat dissipation fins are arranged on the cavity wall of the cylinder head inner cavity and located at the position where the air supply channel is located. The utility model provides the secondary air supply structure of the motorcycle engine, which can stably supply air and is favorable for cooling the cylinder head of the engine.

Description

Technical Field

[0001] The utility model relates to the technical field of motorcycle engines, in particular to a secondary air supply structure of a motorcycle engine with cylinder head cooling. Background Art

[0002] In order to promote environmental protection, most current motorcycle engines are equipped with a secondary air supply structure. During the operation of the motorcycle engine, the exhaust gas in the engine cylinder is discharged from the cylinder through the exhaust valve, then discharged from the cylinder head exhaust channel, and then discharged to the outside through the exhaust pipe. Since the exhaust gas contains incompletely burned mixture, such as CO, NO and HC compounds, it will cause pollution to the environment.

[0003] Therefore, most motorcycle engines are currently equipped with a secondary air supply structure. During exhaust, outside air is introduced into the exhaust channel of the cylinder head, so that compounds such as CO, NO and HC undergo secondary combustion and oxidation in the high-temperature and high-pressure exhaust gas, thereby reducing the pollution of exhaust gas to the environment.

[0004] However, existing secondary air injection structures have the following two major problems: first, the connecting pipes of the secondary air injection structure are too long, the secondary air injection effect is not ideal, and the external connecting pipes take up a lot of space; second, the secondary air injection structure reduces the heat dissipation area of ​​the cylinder head, especially when idling, without forced cooling air, which causes the engine temperature to rise rapidly, resulting in poor combustion and other problems.

[0005] Therefore, the problem of how to design a secondary air supply structure for a motorcycle engine that can stably supply air and is beneficial to cooling the engine cylinder head remains to be solved. Utility Model Content

[0006] The purpose of the utility model is to provide a motorcycle engine secondary air supply structure with cylinder head cooling, and the technical problem to be solved is how to provide a motorcycle engine secondary air supply structure that can stably supply air and is beneficial to the cooling of the engine cylinder head.

[0007] To achieve the above-mentioned purpose, the solution of the present utility model is: a secondary air supply structure of a motorcycle engine with cylinder head cooling, comprising an air supply channel, a secondary air supply valve and heat dissipation fins;

[0008] A motorcycle engine is provided with a cylinder head, a cylinder head inner cavity is formed in the cylinder head, a cylinder head exhaust passage is opened in the cylinder head, and an exhaust valve of the engine is provided at the cylinder head. When the exhaust valve is opened, the engine combustion exhaust gas can be discharged from the exhaust valve to the cylinder head exhaust passage, and then discharged from the cylinder head through the cylinder head exhaust passage.

[0009] The air supply channel is opened on the cylinder head, one end of which is connected to the cylinder head exhaust channel, and extends along the side wall of the cylinder head for a certain length and then passes through to the outside of the cylinder head;

[0010] The secondary air supply valve is arranged in the air supply channel, and is used to allow the air supply channel to flow in one direction toward the cylinder head exhaust channel under the action of pressure difference;

[0011] Heat dissipation fins are provided on the cavity wall of the cylinder head, at the location of the air supply channel.

[0012] Furthermore, the heat dissipation fins extend to where the lubricating oil accumulates in the inner cavity of the cylinder head.

[0013] Furthermore, the lubricating oil accumulates at the lowest point of the inner cavity of the cylinder head, and the extension path of the air supply channel passes through the lowest point of the inner cavity of the cylinder head.

[0014] Furthermore, the air supply channel includes a first air supply channel section and a second air supply channel section. An air supply valve mounting groove is opened on the outer wall of the cylinder head. One end of the first air supply channel section is connected to the cylinder head exhaust channel, and the other end leads to the air supply valve mounting groove. The secondary air supply valve is installed in the air supply valve mounting groove. A secondary air supply valve cover is installed on the cylinder head. The secondary air supply valve cover is sealed on the notch of the air supply valve mounting groove. The second air supply channel section is opened on the secondary air supply valve cover and passes through the secondary air supply valve cover, so that the air supply valve mounting groove is connected to the outside world.

[0015] Furthermore, when the air pressure at the cylinder head exhaust passage is lower than the external air pressure, the secondary air supply valve takes air into the cylinder head exhaust passage.

[0016] Furthermore, the secondary air supply valve includes a baffle and a reed. The baffle has an air outlet. The reed is elastic, one end of which is fixed to the baffle, and the other end of which is elastically attached to one side of the baffle to cover the air outlet.

[0017] After adopting the above solution, the beneficial effects of the utility model are:

[0018] (1) An air supply channel is directly opened on the cylinder head. Through the secondary air supply valve, the air supply channel is allowed to flow in one direction toward the cylinder head exhaust channel under the action of pressure difference. When the air pressure at the cylinder head exhaust channel is lower than the external atmospheric pressure during the exhaust process, the external air can enter the cylinder head exhaust channel through the air supply channel, so that the exhaust gas undergoes secondary combustion and oxidation. The air supply structure is simple in structure and has a short path, which is conducive to achieving stable air intake while saving space.

[0019] (2) Heat dissipation fins are provided on the wall of the inner cavity of the cylinder head, at the location of the air supply channel. The heat in the cylinder head is transferred to the heat dissipation fins. During the air intake process of the air supply channel, the heat on the heat dissipation fins is transferred to the air in the air supply channel, thereby dissipating the heat of the inner cavity of the cylinder head and preheating the air inhaled into the air supply channel, thereby preventing the exhaust gas from being mixed with the exhaust gas, causing the exhaust gas temperature to drop too much, and preventing the exhaust gas from being fully burned and oxidized. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a partial cross-sectional schematic diagram of the present utility model;

[0021] Figure 2 It is a schematic diagram of the structure inside the bar head body;

[0022] Figure 3 This is a partial exploded structural diagram of the utility model;

[0023] Figure 4 Schematic diagram of the structure of the cylinder head cover;

[0024] Figure 5 This is the structural diagram of the secondary air supply valve.

[0025] Explanation of the numbers: 1-air supply channel, 2-secondary air supply valve, 3-heat dissipation fins, 4-cylinder head, 5-cylinder head inner cavity, 6-cylinder head exhaust channel, 7-exhaust valve, 8-lubricating oil, 9-air supply channel section 1, 10-air supply channel section 2, 11-air supply valve mounting groove, 12-secondary air supply valve cover, 13-intake valve, 14-cylinder head body, 15-cylinder head cover, 16-baffle, 17-reed, 18-air port. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] In the claims, specification and the above-mentioned drawings of the present invention, unless otherwise expressly defined, directional words, such as the use of terms such as "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, so they cannot be understood as limiting the specific scope of protection of the present invention.

[0028] A secondary air supply structure for a motorcycle engine with cylinder head cooling, such as Figure 1-5As shown, it includes an air supply channel 1, a secondary air supply valve 2 and a heat dissipation fin 3; a cylinder head 4 is provided on the engine, and the cylinder head 4 is specifically formed by buckling a cylinder head body 14 and a cylinder head cover 15, and a cylinder head inner cavity 5 is formed in the cylinder head 4. The cylinder head 4 is a conventional arrangement on a motorcycle engine, also called a cylinder head or cylinder head, etc. A rocker arm and other structures for linking the intake valve 13 and the exhaust valve 7 are provided in the cylinder head inner cavity 5. In this embodiment, its internal structure is not further detailed. The cylinder head 4 is provided with a cylinder head exhaust channel 6, and the exhaust valve 7 of the engine is provided at the cylinder head 4. When the exhaust valve 7 is opened, the combustion exhaust gas in the engine cylinder can be discharged from the exhaust valve 7 to the cylinder head exhaust channel 6, and then discharged from the cylinder head exhaust channel 6 to the cylinder head 4. This is also a conventional arrangement in the art;

[0029] The air supply channel 1 is opened on the cylinder head 4, one end of the air supply channel 1 is connected to the cylinder head exhaust channel 6, and extends a length along the side wall of the cylinder head 4 and then passes through to the outside of the cylinder head 4; the secondary air supply valve 2 is arranged in the air supply channel 1, which can be any existing valve structure that can make the air supply channel 1 one-way intake toward the cylinder head exhaust channel 6 under the action of pressure difference, so that when the air pressure at the cylinder head exhaust channel 6 is lower than the external air pressure, the external air is sucked into the cylinder head exhaust channel 6; on the cavity wall of the cylinder head inner cavity 5, at the position where the air supply channel 1 is located, a heat dissipation scale 3 is provided, and then the heat in the cylinder head 4 is conducted to the heat dissipation scale 3. During the process of air intake through the air supply channel 1, the heat on the heat dissipation scale 3 is conducted to the air in the air supply channel 1, so as to achieve heat dissipation of the cylinder head inner cavity 5, and at the same time achieve pre-heating of the air sucked into the air supply channel 1, so as to avoid excessive temperature drop of the exhaust gas when it mixes with the exhaust gas, and thus making it impossible to fully carry out secondary combustion and oxidation.

[0030] In order to make the cooling more sufficient, the heat dissipation fins 3 are preferably extended to the place where the lubricating oil 8 accumulates in the cylinder head cavity 5. More specifically, the lubricating oil 8 accumulates at the lowest point of the cylinder head cavity 5, and the extension path of the air supply channel 1 passes through the lowest point of the cylinder head cavity 5. The heat dissipation fins 3 are provided in plurality, and at least some of the heat dissipation fins 3 extend to the lowest point of the cylinder head cavity 5. Specifically in the present embodiment, the plurality of heat dissipation fins 3 extend longitudinally so as to be able to extend to the lowest point of the cylinder head cavity 5 respectively.

[0031] In order to facilitate the installation and replacement of the secondary air supply valve 2 and make the structure simpler, the air supply channel 1 includes an air supply channel section 19 and an air supply channel section 2 10. An air supply valve mounting groove 11 is provided on the outer wall of the cylinder head 4. One end of the air supply channel section 19 is connected to the cylinder head exhaust channel 6, and the other end leads to the air supply valve mounting groove 11. The secondary air supply valve 2 is installed in the air supply valve mounting groove 11, and a secondary air supply valve cover 12 is installed on the cylinder head 4. The secondary air supply valve cover 12 is sealed on the notch of the air supply valve mounting groove 11. The air supply channel section 2 10 is opened on the secondary air supply valve cover 12 and passes through the secondary air supply valve cover 12, so that the air supply valve mounting groove 11 is connected to the outside world.

[0032] Specifically in this embodiment, the secondary air supply valve 2 includes a baffle 16 and a reed 17. The baffle 16 has an air outlet 18. The reed 17 is elastic, one end of which is fixed to the baffle 16, and the other end is elastically attached to one side of the baffle 16 to cover the air outlet 18. Under the action of the reed 17, air can only pass through the air outlet 18 in one direction.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the design of this case. Any equivalent changes made based on the key design of this case shall fall within the scope of protection of this case.

Claims

1. A secondary air supply structure for a motorcycle engine with cylinder head cooling, characterized by: It comprises an air supply channel (1), a secondary air supply valve (2) and a heat dissipation fin (3); The engine is provided with a cylinder head (4), a cylinder head inner cavity (5) is formed in the cylinder head (4), a cylinder head exhaust passage (6) is provided in the cylinder head (4), an exhaust valve (7) of the engine is provided at the cylinder head (4), and when the exhaust valve (7) is opened, the engine combustion exhaust gas can be discharged from the exhaust valve (7) to the cylinder head exhaust passage (6), and then discharged from the cylinder head (4) through the cylinder head exhaust passage (6); An air supply channel (1) is provided on the cylinder head (4), one end of the air supply channel (1) is connected to the cylinder head exhaust channel (6), and extends along the side wall of the cylinder head (4) for a certain length and then penetrates and is connected to the outside of the cylinder head (4); The secondary air supply valve (2) is arranged in the air supply channel (1) and is used to allow the air supply channel (1) to flow in one direction toward the cylinder head exhaust channel (6) under the action of pressure difference; Heat dissipation fins (3) are provided on the cavity wall of the cylinder head inner cavity (5), at the location where the air supply channel (1) is located.

2. A secondary air supply structure for a motorcycle engine with cylinder head cooling as claimed in claim 1, characterized in that: The heat dissipation fins (3) extend to the location where the lubricating oil (8) accumulates in the cylinder head inner cavity (5).

3. A secondary air supply structure for a motorcycle engine with cylinder head cooling as claimed in claim 1, characterized in that: The lubricating oil (8) accumulates at the lowest point of the cylinder head inner cavity (5), and the extension path of the air supply channel (1) passes through the lowest point of the cylinder head inner cavity (5).

4. A secondary air supply structure for a motorcycle engine with cylinder head cooling as claimed in claim 1, characterized in that: The air supply channel (1) includes an air supply channel section (9) and an air supply channel section (10). An air supply valve installation groove (11) is provided on the outer wall of the cylinder head (4). One end of the air supply channel section (9) is connected to the cylinder head exhaust channel (6), and the other end is connected to the air supply valve installation groove (11). The secondary air supply valve (2) is installed in the air supply valve installation groove (11). A secondary air supply valve cover (12) is installed on the cylinder head (4). The secondary air supply valve cover (12) is sealed on the notch of the air supply valve installation groove (11). The air supply channel section (10) is provided on the secondary air supply valve cover (12) and passes through the secondary air supply valve cover (12), so that the air supply valve installation groove (11) is connected to the outside world.

5. The secondary air supply structure of a motorcycle engine with cylinder head cooling according to claim 1, characterized in that: When the air pressure at the cylinder head exhaust passage (6) is lower than the external air pressure, the secondary air supply valve (2) takes air into the cylinder head exhaust passage (6).

6. A motorcycle engine secondary air supply structure with cylinder head cooling as claimed in claim 1, characterized in that: The secondary air supply valve (2) comprises a baffle (16) and a reed (17). The baffle (16) is provided with an air outlet (18). The reed (17) is elastic, one end of which is fixed to the baffle (16), and the other end of which is elastically attached to one side of the baffle (16) to cover the air outlet (18).

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