Exhaust sound deadening structure for motorcycle

Abstract

The application provides an exhaust silencing structure of a motorcycle, and belongs to the technical field of motorcycles. The technical problem of insufficient silencing of an existing exhaust silencing structure is solved. The exhaust silencing structure of the motorcycle, the motorcycle comprising an exhaust pipe one, a catalytic converter and an exhaust cover pipe for accommodating the catalytic converter, the intake end of the exhaust cover pipe being in communication with the exhaust end of the exhaust pipe one, the exhaust silencing structure comprising a through pressure pipe in communication between the outer periphery of the exhaust pipe one and the exhaust cover pipe, and the port of the through pressure pipe in communication with the exhaust cover pipe being located between the catalytic converter and the intake end of the exhaust cover pipe. The application can improve the silencing performance of the motorcycle under special working conditions.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of motorcycle technology, and relates to an exhaust silencing structure of a motorcycle. BACKGROUND

[0002] The motorcycle muffler is a device allowing airflow to pass through while attenuating noise, and is one of the important parts on the motorcycle. After the engine works, the exhaust stroke follows, and the exhaust is to discharge the exhaust gas in the cylinder. Since the exhaust gas at this time is high temperature and high pressure, it will be a great noise if directly discharged through the exhaust pipe, and the function of the muffler is to attenuate the airflow discharged by the engine in the muffler to achieve the purpose of silencing.

[0003] The application with the publication number CN101649766A discloses a double exhaust muffler of an electronic injection motorcycle, comprising an oxygen sensor and a net-shaped three-way catalyst, characterized in that: the three-way catalyst is installed in a catalyst connecting pipe, one end of the catalyst connecting pipe is provided with a three-way input pipe, and the other end is connected with an output piece; the output port of the three-way input pipe is welded on the catalyst connecting pipe, the oxygen sensor is fixed between the two input ports of the three-way input pipe, the oxygen sensor obtains the oxygen content information in the three-way input pipe, and the oxygen content information is output through a wire; the input port of the output piece is welded on the catalyst connecting pipe, and the output port of the output piece is provided with a clamp.

[0004] The above muffler structure can guarantee the tail gas standard and realize certain silencing function, but it is still difficult to eliminate the explosion sound caused by the rapid change of the motorcycle speed, the working condition and the back pressure of the exhaust gas. SUMMARY

[0005] The present application provides an exhaust silencing structure of a motorcycle to solve the problem of insufficient silencing performance of the existing motorcycle exhaust structure.

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

[0007] An exhaust silencing structure of a motorcycle, the motorcycle comprising an exhaust pipe one, a catalytic converter and an exhaust cover pipe for accommodating the catalytic converter, the intake end of the exhaust cover pipe being in communication with the exhaust end of the exhaust pipe one, characterized in that the exhaust silencing structure comprises a pressure passage pipe in communication between the outer periphery of the exhaust pipe one and the exhaust cover pipe, and the port of the pressure passage pipe in communication with the exhaust cover pipe is located between the catalytic converter and the intake end of the exhaust cover pipe.

[0008] The exhaust pipe one is used to communicate with the motorcycle engine to guide the exhaust gas generated by the engine to be discharged, the catalytic converter is the existing component which can convert the harmful gases such as CO, HC and NOx in the exhaust gas into harmless carbon dioxide, water and nitrogen by oxidation and reduction, the exhaust cover pipe protects the catalytic converter inside, the inlet end of the exhaust cover pipe communicates with the exhaust pipe one, and the outlet end of the exhaust cover pipe can directly communicate with the outside to discharge the purified exhaust gas. By arranging the pressure passage pipe between the outer periphery of the exhaust pipe one and the exhaust cover pipe, one end of the pressure passage pipe communicates with the exhaust pipe, and the other end of the pressure passage pipe communicates with the area between the catalytic converter and the inlet end of the exhaust cover pipe. In this way, during the process that the motorcycle is greatly decelerated from a high speed state, the exhaust pressure of the engine is suddenly reduced, and the high-pressure exhaust gas which is not discharged before the catalytic converter flows back to form back pressure. At this time, the high-pressure exhaust gas can directly flow into the exhaust pipe one from the pressure passage pipe to flow together with the exhaust gas discharged by the engine, avoiding the high-pressure exhaust gas flowing back along the original path to impact the reverse exhaust gas, thereby improving the sound attenuation performance under special working conditions.

[0009] In the above motorcycle exhaust sound attenuation structure, one end of the pressure passage pipe which communicates with the exhaust pipe one is perpendicular or approximately perpendicular to the exhaust pipe one. In this way, during the normal exhaust process, the exhaust gas flows along the exhaust pipe one and is difficult to enter the vertical pressure passage pipe, ensuring normal exhaust, and when the high-pressure exhaust gas passes through the pressure passage pipe, it can meet the exhaust gas flowing in the vertical exhaust pipe one, avoiding direct impact and also consuming high-pressure impact energy, so that the pressure is balanced faster, thereby improving the sound attenuation effect.

[0010] In the above motorcycle exhaust sound attenuation structure, the motorcycle further comprises an exhaust pipe two, and the outlet end of the exhaust pipe two is arranged in parallel with the outlet end of the exhaust pipe one and communicates with the inlet end of the exhaust cover pipe. A large displacement engine is often configured with multiple exhaust pipes. In this way, the exhaust gas discharged from the exhaust pipe one and the exhaust pipe two of the multi-cylinder engine can enter the exhaust cover pipe in the same direction for purification and exhaust, ensuring smoother exhaust.

[0011] In the above motorcycle exhaust sound attenuation structure, the outlet end of the exhaust pipe one has a U-shaped elbow section, and the elbow section is arranged in parallel with the outlet end of the exhaust pipe two. In this way, under the condition that the exhaust gas flowing into the exhaust cover pipe from the exhaust pipe one and the exhaust pipe two is ensured, the exhaust gas entering the exhaust pipe one can generate greater loss after passing through the elbow section, thereby facilitating the reduction of noise generation, and at the same time, the exhaust gas flowing out of the exhaust pipe one and the exhaust pipe two is differentiated, avoiding noise caused by vibration amplification.

[0012] In the above motorcycle exhaust sound attenuation structure, the middle section of the exhaust pipe one is arranged close to the exhaust cover pipe. In this way, it is beneficial to reduce the length of the pressure passage pipe, make the structure compact, and ensure smooth exhaust flow response.

[0013] In the above-mentioned exhaust silencing structure of motorcycle, the exhaust cover pipe comprises a front transition section, a containing section and a rear transition section connected in sequence, the catalytic converter is fixed in the containing section, the exhaust pipe one is connected with the front transition section, the end of the front transition section connected with the containing section is flared, and the port of the pressure equalizing pipe is arranged on the inner wall of the flared end of the front transition section. The port of the pressure equalizing pipe is arranged on the inner wall of the flared end of the front transition section, so that the high-pressure exhaust gas collected in the catalytic converter can be guided by the inner wall of the flared end to flow more smoothly into the pressure equalizing pipe, thereby ensuring stable silencing effect.

[0014] In the above-mentioned exhaust silencing structure of motorcycle, the middle part of the front transition section is provided with a necking, and the inlet end of the exhaust pipe one and the port are respectively arranged on both sides of the position where the necking is located. The necking is beneficial to increase the resistance of the high-pressure exhaust gas backflow, thereby guiding the high-pressure exhaust gas to flow through the pressure equalizing pipe and ensuring the silencing effect.

[0015] In the above-mentioned exhaust silencing structure of motorcycle, the inner diameter of the pressure equalizing pipe is equivalent to the inner diameter of the exhaust pipe one. This is beneficial to ensure that the high-pressure exhaust gas entering the pressure equalizing pipe is sufficiently combined with the exhaust gas in the exhaust pipe one to equalize the pressure.

[0016] In the above-mentioned exhaust silencing structure of motorcycle, the middle section of the rear transition section is connected with a partition plate extending along the setting direction of the rear transition section. The partition plate can separate and guide the exhaust gas flowing into the rear transition section after purification, increase the probability of gas flow colliding with the inner wall, weaken the noise before being discharged to the outside, and make the exhaust gas flow more uniform and reduce turbulence.

[0017] In the above-mentioned exhaust silencing structure of motorcycle, the partition plate is in the shape of an arc plate. This is beneficial to make the flowing exhaust gas collide and reflect between the partition plate and the inner wall of the rear transition section during the exhaust gas discharge process, thereby further reducing the noise.

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

[0019] The exhaust silencing structure of the motorcycle can ensure stable silencing effect. BRIEF DESCRIPTION OF DRAWINGS

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

[0021] Figure 2 is a schematic diagram of the front view structure of the embodiment.

[0022] Figure 3 is Figure 2 A-A section view of the schematic diagram in

[0023] Figure 4 is an exploded view of the catalytic converter and the exhaust cover pipe cooperation in this embodiment.

[0024] In the figure, 1, exhaust pipe one; 11, elbow section;

[0025] 2, catalytic converter;

[0026] 3, exhaust cover pipe; 31, front transition section; 311, necking; 32, containing section; 33, rear transition section;

[0027] 4, through pressure pipe; 41, port;

[0028] 5, exhaust pipe two; 6, partition plate. DETAILED DESCRIPTION

[0029] The following is a specific embodiment of the present application and further describes the technical solutions of the present application in conjunction with the drawings, but the present application is not limited to these embodiments.

[0030] As Figures 1-3As shown, the exhaust silencing structure of the motorcycle includes an exhaust pipe 1, a catalytic converter 2 and an exhaust cover pipe 3 for accommodating the catalytic converter 2, the intake end of the exhaust cover pipe 3 is communicated with the exhaust end of the exhaust pipe 1, the exhaust silencing structure includes a pressure passage pipe 3, the pressure passage pipe 3 is communicated between the middle section of the exhaust pipe 1 and the exhaust cover pipe 3, the port 41 of the pressure passage pipe 4 communicated with the exhaust cover pipe 3 is located between the catalytic converter 2 and the intake end of the exhaust cover pipe 3. The exhaust pipe 1 is used to communicate with the motorcycle engine to guide the exhaust gas generated by the engine to be discharged, the catalytic converter 2 is an existing component, the exhaust cover pipe 3 protects the catalytic converter 2 inside, the intake end of the exhaust cover pipe 3 is communicated with the exhaust pipe 1, and the exhaust end can be directly communicated with the outside to discharge the purified exhaust gas. By arranging the pressure passage pipe 4 between the middle section of the exhaust pipe 1 and the exhaust cover pipe 3, one end of the pressure passage pipe 4 is communicated with the exhaust pipe, and the other end is communicated to the area between the catalytic converter 2 and the intake end of the exhaust cover pipe 3, so that in the process of the motorcycle from high speed to a large extent, the exhaust pressure of the engine is suddenly reduced, and the high-pressure exhaust gas that has not been discharged before the catalytic converter 2 will flow back to the exhaust pipe to form back pressure, at this time, the high-pressure exhaust gas can directly flow into the exhaust pipe 1 from the pressure passage pipe 4 to flow with the exhaust gas discharged by the engine, avoiding the high-pressure exhaust gas flowing back to the original route and colliding with the reverse exhaust gas to cause explosion, thereby improving the silencing performance under special conditions. Specifically, one end of the pressure passage pipe 4 communicated with the exhaust pipe 1 is perpendicular to the part of the exhaust pipe 1. In this way, in the normal exhaust process, the exhaust gas flows along the exhaust pipe 1 and is difficult to enter the vertical pressure passage pipe 4, ensuring normal exhaust, and when the high-pressure exhaust gas passes through the pressure passage pipe 4, it can meet the exhaust gas flowing in the vertical exhaust pipe 1, avoiding direct impact and also consuming high-pressure impact energy, so that the pressure is balanced faster, thereby improving the silencing effect. The motorcycle further includes an exhaust pipe 5, the exhaust end of the exhaust pipe 5 is arranged in parallel with the exhaust end of the exhaust pipe 1 and is communicated with the intake end of the exhaust cover pipe 3. The large displacement engine is often configured with two exhaust pipes, so that the exhaust gas discharged from the multi-cylinder engine through the exhaust pipe 1 and the exhaust pipe 5 can enter the exhaust cover pipe 3 in the same direction for purification and exhaust, ensuring smooth exhaust. As a preferred, the exhaust end of the exhaust pipe 1 has a U-shaped elbow section 11, the elbow section 11 is arranged in parallel with the exhaust end of the exhaust pipe 5. In this way, under the condition of ensuring that the exhaust gas entering the exhaust cover pipe 3 from the exhaust pipe 1 and the exhaust pipe 5 flows in the same direction, the exhaust gas entering the exhaust pipe 1 can produce greater loss after passing through the elbow section 11, thereby facilitating the reduction of noise generation, and at the same time, it is beneficial to make the exhaust gas flowing out of the exhaust pipe 1 different from the exhaust gas flowing out of the exhaust pipe 5, avoiding the noise caused by vibration amplification. The middle section of the exhaust pipe 1 is arranged close to the exhaust cover pipe 3. In this way, it is beneficial to reduce the length of the pressure passage pipe 4, making the structure compact, while ensuring smooth exhaust flow response. The inner diameter of the pressure passage pipe 4 is equivalent to the inner diameter of the exhaust pipe 1. In this way, it is beneficial to make the high-pressure exhaust gas entering the pressure passage pipe 4 fully mix with the exhaust gas in the exhaust pipe 1 to balance the pressure.

[0031] like Figures 1-4 As shown, the exhaust hood pipe 3 includes a front transition section 31, a receiving section 32, and a rear transition section 33 connected in sequence. The catalytic converter 2 is fixed inside the receiving section 32. The outlet end of the exhaust pipe 1 is connected to the front transition section 31. The end of the front transition section 31 connected to the receiving section 32 is flared, and port 41 is located on the inner wall of the flared end of the front transition section 31. The port 41 is arranged on the inner wall of the flared end of the front transition section 31 so that the high-pressure exhaust gas collected from the catalytic converter 2 can be guided by the inner wall of the flared end and flow more smoothly into the pressure pipe 4, thereby ensuring a stable silencing effect. The middle part of the front transition section 31 has a constriction 311, the inner diameter of which is slightly larger than the inner diameter of the exhaust pipe 1. The inlet end of the exhaust pipe 1 and port 41 are located on both sides of the location of the constriction 311. This constriction 311 helps to increase the resistance of the high-pressure exhaust gas backflow, thereby guiding it to flow through the pressure pipe 4 and ensuring the silencing effect. A partition plate 6 extending along the direction of the rear transition section 33 is connected to the middle section of the inner cavity. This partition plate 6 separates and discharges the purified exhaust gas flowing into the rear transition section 33, increasing the probability of airflow colliding with the inner wall and reducing noise before discharge to the outside. The partition plate 6 is arc-shaped. This facilitates collision and reflection between the partition plate 6 and the inner wall of the rear transition section during the exhaust process, further reducing noise.

[0032] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. An exhaust muffling structure for a motorcycle, the motorcycle including an exhaust pipe one (1), a catalytic converter (2), and an exhaust cover pipe (3) for housing the catalytic converter (2), a gas inlet end of the exhaust cover pipe (3) being communicated with a gas outlet end of the exhaust pipe one (1), characterized in that, The exhaust silencing structure comprises a through pipe (4) communicated between the outer periphery of the exhaust pipe (1) and the exhaust cover pipe (3), the port (41) of the through pipe (4) communicated with the exhaust cover pipe (3) is located between the catalytic converter (2) and the inlet end of the exhaust cover pipe (3); the end of the through pipe (4) communicated with the exhaust pipe (1) is perpendicular or approximately perpendicular to the exhaust pipe (1), the motorcycle further comprises an exhaust pipe (5), the outlet end of the exhaust pipe (5) is arranged in parallel with the outlet end of the exhaust pipe (1) and communicated with the inlet end of the exhaust cover pipe (3), the exhaust cover pipe (3) comprises a front transition section (31), a containing section (32) and a rear transition section (33) connected in sequence, the catalytic converter (2) is fixed in the containing section (32), the outlet end of the exhaust pipe (1) is communicated with the front transition section (31), the end of the front transition section (31) connected with the containing section (32) is flared, and the port (41) of the through pipe (4) is located on the inner wall of the flared end of the front transition section (31).

2. The exhaust silencing structure of a motorcycle according to claim 1, characterized by, The outlet end of the exhaust pipe (1) has a U-shaped elbow section (11), the elbow section (11) is arranged in parallel with the outlet end of the exhaust pipe (5).

3. The exhaust silencing structure for a motorcycle according to claim 1 or 2, characterized in that, The middle section of the exhaust pipe (1) is arranged close to the exhaust cover pipe (3).

4. The exhaust silencing structure of a motorcycle according to claim 1 or 2, characterized in that, The inner diameter of the through pipe (4) is equivalent to the inner diameter of the exhaust pipe (1).

5. The exhaust silencing structure of a motorcycle according to claim 1, characterized by The middle part of the front transition section (31) has a necked portion (311), the inlet end of the exhaust pipe (1) and the port (41) are respectively located on the two sides of the position of the necked portion (311).

6. The exhaust silencing structure of a motorcycle according to claim 1, characterized by The middle section of the rear transition section (33) is connected with a partition plate (6) extending along the setting direction of the rear transition section (33).

7. The exhaust silencing structure of a motorcycle according to claim 6, characterized by The partition plate (6) is in the shape of an arc plate.

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