Air inlet structure of motorcycle engine
By introducing a dual-channel structure and partition rib design into the motorcycle engine intake system, the problem of poor gas mixing in the single-channel design is solved, resulting in stronger tumble flow and improved combustion efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JINLANG SCI & TECH
- Filing Date
- 2025-08-06
- Publication Date
- 2026-05-19
AI Technical Summary
The single-channel design of traditional motorcycle engine intake systems results in poor uniform gas mixing, affecting combustion efficiency and power.
It adopts a dual-intake structure, including a main intake and an auxiliary intake. When the airflow from the auxiliary intake enters the main intake, it creates a disturbance, which enhances the tumble effect. The inner cavity of the intake pipe is divided into independent chambers by partition ribs and is sealed to the cylinder head by connecting flanges.
It enhances the turbulence intensity in the combustion chamber, improves combustion efficiency and power, and enhances the combustion performance of the engine.
Smart Images
Figure CN224260450U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of motorcycle parts and relates to an air intake structure for a motorcycle engine. Background Technology
[0002] In traditional motorcycle engine intake systems, the intake manifold typically employs a single-channel cavity design. The outlet end of the intake manifold is rigidly connected to the intake face of the cylinder head via a flange and gasket, forming a sealed interface. The cylinder head also features a single intake passage, extending directly from the intake face to the intake valve seat, resulting in a continuous single-channel intake path. The intake structure of the engine intake system has a decisive impact on the uniform mixing of gases, the gas movement pattern, the amount of air entering the cylinder, and the combustion process, thereby affecting the engine's power, fuel economy, combustion noise, and harmful exhaust emissions. Utility Model Content
[0003] This invention addresses the shortcomings of existing technologies by providing an intake structure for a motorcycle engine that enhances tumble flow and improves combustion efficiency.
[0004] To solve the above-mentioned technical problems, the objective of this utility model is achieved through the following technical solution:
[0005] An intake structure for a motorcycle engine includes an intake pipe and a cylinder head. The end of the intake pipe is sealed to the intake end face of the cylinder head. The outlet end of the intake pipe is provided with a main intake port and an auxiliary intake port. The cylinder head has a main intake passage and an auxiliary intake passage formed inside it. The main intake port is connected to the main intake passage, and the auxiliary intake port is connected to the auxiliary intake passage. The outlet end of the auxiliary intake passage is connected to the side wall of the main intake passage and is connected to the main intake passage. The opening area of the auxiliary intake port is smaller than the opening area of the main intake port, and the cross-sectional area of the auxiliary intake passage is smaller than the cross-sectional area of the main intake passage.
[0006] In the above-mentioned intake structure of a motorcycle engine, the inner cavity of the intake pipe is provided with a partition rib, which divides the inner cavity of the intake pipe into an independent main intake chamber and an auxiliary intake chamber.
[0007] In the air intake structure of the motorcycle engine described above, the partition rib is integrally cast with the air intake pipe.
[0008] In the above-mentioned intake structure of a motorcycle engine, the extending direction of the partition rib is consistent with the bending direction of the intake pipe, that is, the partition rib has the same curvature as the intake pipe; the cross-sectional area of the main intake cavity is approximately the same as the opening area of the main intake port; the cross-sectional area of the auxiliary intake cavity is approximately the same as the opening area of the auxiliary intake port.
[0009] In the aforementioned intake structure of a motorcycle engine, the auxiliary intake duct is a flat structure, and the extension direction of the long side of the flat structure is parallel to the main intake duct.
[0010] In the above-mentioned intake structure of a motorcycle engine, the inlet end of the partition rib is separated from the inlet end face of the intake pipe, and the outlet end of the partition rib is flush with the outlet end face of the intake pipe.
[0011] In the air intake structure of the motorcycle engine described above, the inlet end of the partition rib is provided with a flow-diverting structure, which includes a thin-walled structure converging at the end and an arc-shaped structure with an inwardly concave end.
[0012] In the above-mentioned intake structure of a motorcycle engine, the intake pipe is sealed to the cylinder head via a connecting flange. Both sides of the connecting flange are provided with sealing grooves, and sealing elements that seal the intake pipe and cylinder head are respectively provided within the sealing grooves. The connecting flange is provided with a main connection port connecting the main intake port and the main intake passage, and an auxiliary connection port connecting the auxiliary intake port and the auxiliary intake passage. The sealing element is a sealing gasket. Several protrusions integrally formed with the sidewall of the sealing groove are provided within the sealing groove, and the sealing element is provided with a limiting structure that mates with the protrusions.
[0013] In the above-mentioned intake structure of a motorcycle engine, the intake pipe is provided with a mounting post, the connecting flange is provided with a mounting hole, and the mounting bolt passes through the mounting post and the mounting hole and is screwed and fixed to the threaded hole on the cylinder head.
[0014] Compared with the prior art, this utility model has the following advantages:
[0015] This utility model provides an air intake structure for a motorcycle engine. By setting a main air intake port and an auxiliary air intake port in the air intake pipe, and a main air intake passage and an auxiliary air intake passage in the cylinder head, a dual-pass air intake structure is formed. The dual-pass air intake increases the air intake volume. At the same time, when the gas enters the main air intake passage from the auxiliary air intake passage, it creates disturbance to the gas in the main air intake passage to enhance tumble flow, indirectly improving combustion efficiency and providing further support for the engine's power and economy. Attached Figure Description
[0016] Figure 1 This is a perspective view of the present invention;
[0017] Figure 2 This is a cross-sectional view of the present invention;
[0018] Figure 3 This is a perspective view of the air intake pipe of this utility model;
[0019] Figure 4 This is another perspective view of the air intake pipe of this utility model;
[0020] Figure 5 This is a perspective view of the connecting flange of this utility model;
[0021] Reference numerals: 1. Intake pipe; 11. Main intake port; 12. Auxiliary intake port; 13. Isolation rib; 14. Main intake chamber; 15. Auxiliary intake chamber; 16. Flow divider structure; 17. Mounting column; 21. Main intake duct; 22. Auxiliary intake duct; 3. Connecting flange; 31. Sealing groove; 32. Main connection port; 33. Auxiliary connection port; 34. Mounting hole. Detailed Implementation
[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-5 :
[0023] An intake structure for a motorcycle engine includes an intake pipe 1 and a cylinder head (the cylinder head is not shown in the attached drawing; only its internal air passage structure is shown). The end of the intake pipe 1 is sealed to the intake end face of the cylinder head. The outlet end of the intake pipe 1 is provided with a main intake port 11 and an auxiliary intake port 12. The cylinder head is formed with a main intake passage 21 and an auxiliary intake passage 22. The main intake port 11 is connected to the main intake passage 21, and the auxiliary intake port 12 is connected to the auxiliary intake passage 22. The outlet end of the auxiliary intake passage 22 is connected to the side wall of the main intake passage 21 and is connected to the main intake passage 21. The opening area of the auxiliary intake port 12 is smaller than the opening area of the main intake port 11, and the cross-sectional area of the auxiliary intake passage 22 is smaller than the cross-sectional area of the main intake passage 21.
[0024] Comparison Appendix Figure 1 and attached Figure 2 In this embodiment, gas enters from the inlet end of the intake pipe 1, flows along the inner cavity of the intake pipe 1, and exits from the outlet end of the intake pipe 1. During the flow of gas in the inner cavity of the intake pipe 1, the gas is split into two gas paths. One path is the main gas path, and the gas in the main gas path flows out from the main intake port 11 and enters the main intake passage 21 of the cylinder head. The other path is the auxiliary gas path, and the gas in the auxiliary gas path flows out from the auxiliary intake port 12 and enters the auxiliary intake passage 22 of the cylinder head. The airflow entering the auxiliary intake passage 22 disturbs the mainstream gas in the main intake passage 21, disrupts the laminar flow state, and significantly enhances the tumble intensity of the gas entering the combustion chamber, that is, forms a stronger air rotation motion. The enhanced tumble promotes the mixing of fuel and air, increases the turbulence intensity in the combustion chamber, and thus indirectly improves combustion efficiency and speed.
[0025] Comparison Appendix Figure 3 and attached Figure 4The inner cavity of the aforementioned intake pipe 1 is provided with a partition rib 13, which divides the inner cavity of the intake pipe 1 into an independent main intake chamber 14 and an auxiliary intake chamber 15. The main intake chamber 14 forms the main air passage, and the auxiliary intake chamber 15 forms the auxiliary air passage. For ease of production, the partition rib 13 is integrally cast with the intake pipe 1.
[0026] The extension direction of the aforementioned partition rib 13 is consistent with the bending direction of the air intake pipe 1, that is, the partition rib 13 has the same curvature as the air intake pipe 1; the cross-sectional area of the main air intake chamber 14 is approximately the same as the opening area of the main air intake port 11; the cross-sectional area of the auxiliary air intake chamber 15 is approximately the same as the opening area of the auxiliary air intake port 12. The above structure can ensure smooth air intake.
[0027] The aforementioned auxiliary air intake 22 has a flat structure, and the long side of the flat structure extends parallel to the main air intake 21; the airflow of the flat structure can act on the main airflow over a wider range.
[0028] The inlet end of the aforementioned partition rib 13 is spaced from the inlet end face of the air intake pipe 1, and the outlet end of the partition rib 13 is flush with the outlet end face of the air intake pipe 1.
[0029] The inlet end of the aforementioned partition rib 13 is provided with a flow diversion structure 16, which includes a thin-walled structure converging at the end and an arc-shaped structure concave at the end; the flow diversion structure 16 forms a wedge-shaped guide surface, which smoothly guides the airflow separation at the inlet end of the partition rib 13, so that it can efficiently enter the main / auxiliary independent cavities.
[0030] Comparison Appendix Figure 5 The aforementioned intake pipe 1 is sealed to the cylinder head via a connecting flange 3. Both sides of the connecting flange 3 are provided with sealing grooves 31. Sealing elements that seal the intake pipe 1 and the cylinder head are respectively provided in the sealing grooves 31. The connecting flange 3 is provided with a main connecting port 32 that connects the main intake port 11 and the main intake channel 21, and an auxiliary connecting port 33 that connects the auxiliary intake port 12 and the auxiliary intake channel 22. The sealing element is a sealing gasket. Several protrusions that are integrated with the side wall of the groove are provided in the sealing groove 31. The sealing element is provided with a limiting structure that cooperates with the protrusions.
[0031] Furthermore, the intake pipe 1 is provided with a mounting post 17, and the connecting flange 3 is provided with a mounting hole 34. The mounting bolt passes through the mounting post 17 and the mounting hole 34 and is screwed and fixed to the threaded hole on the cylinder head.
[0032] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.
Claims
1. An intake structure for a motorcycle engine, comprising an intake pipe (1) and a cylinder head, wherein the end of the intake pipe (1) is sealed to the intake end face of the cylinder head, characterized in that, The outlet end of the intake pipe (1) is provided with a main intake port (11) and an auxiliary intake port (12). The cylinder head is formed with a main intake passage (21) and an auxiliary intake passage (22). The main intake port (11) is connected to the main intake passage (21), and the auxiliary intake port (12) is connected to the auxiliary intake passage (22). The outlet end of the auxiliary intake passage (22) is connected to the side wall of the main intake passage (21) and is connected to the main intake passage (21). The opening area of the auxiliary intake port (12) is smaller than the opening area of the main intake port (11), and the cross-sectional area of the auxiliary intake passage (22) is smaller than the cross-sectional area of the main intake passage (21).
2. The air intake structure of a motorcycle engine according to claim 1, characterized in that, The inner cavity of the air intake pipe (1) is provided with a partition rib (13), which divides the inner cavity of the air intake pipe (1) into an independent main air intake chamber (14) and an auxiliary air intake chamber (15).
3. The air intake structure of a motorcycle engine according to claim 2, characterized in that, The partition rib (13) and the air intake pipe (1) are integrally cast.
4. The air intake structure of a motorcycle engine according to claim 3, characterized in that, The extension direction of the partition rib (13) is consistent with the bending direction of the air intake pipe (1).
5. The air intake structure of a motorcycle engine according to claim 3, characterized in that, The inlet end of the partition rib (13) is separated from the inlet end face of the air inlet pipe (1), and the outlet end of the partition rib (13) is flush with the outlet end face of the air inlet pipe (1).
6. The air intake structure of a motorcycle engine according to claim 3, characterized in that, The inlet end of the partition rib (13) is provided with a diversion structure (16), which includes a thin-walled structure converging at the end and an arc-shaped structure with an inwardly concave end.
7. The air intake structure of a motorcycle engine according to claim 1, characterized in that, The intake pipe (1) is sealed to the cylinder head through a connecting flange (3). Both sides of the connecting flange (3) are provided with sealing grooves (31). Sealing elements that are sealed to the intake pipe (1) and the cylinder head are respectively provided in the sealing grooves (31). The connecting flange (3) is provided with a main connection port (32) connecting the main intake port (11) and the main intake channel (21), and an auxiliary connection port (33) connecting the auxiliary intake port (12) and the auxiliary intake channel (22).
8. The air intake structure of a motorcycle engine according to claim 7, characterized in that, The intake pipe (1) is provided with a mounting post (17), and the connecting flange (3) is provided with a mounting hole (34). The mounting bolt passes through the mounting post (17) and the mounting hole (34) and is screwed to the threaded hole on the cylinder head for fixation.