Silencing exhaust pipe of motorcycle

Abstract

The utility model provides a silencing exhaust pipe of a motorcycle, belongs to the technical field of motorcycle components, and solves the technical problems that an existing silencing exhaust pipe is poor in silencing effect, cannot balance exhaust back pressure and the like. Comprising an air outlet end cover piece and an air inlet end cover piece, an exhaust pipe is arranged between the air outlet end cover piece and the air inlet end cover piece, a flow guide piece, a baffle piece and a ventilation silencing piece are sequentially arranged in the exhaust pipe from front to back, an air outlet pipe is arranged between the air outlet end cover piece and the ventilation silencing piece, and a flow guide pipe is arranged between the ventilation silencing piece and the baffle piece. According to the utility model, multiple times of volume mutation can be carried out, density and pressure are reduced, noise is weakened, flowing direction can be changed, kinetic energy is reduced, turbulent flow can be generated, noise is counteracted while exhaust efficiency is ensured, waste gas can be divided into a plurality of fine air flows, and the generated noise is absorbed and counteracted through a resonance effect, so that a drainage channel can be formed, condensate water can be discharged, and corrosion is avoided; pressure mutation can be relieved, exhaust back pressure is balanced, and noise can be reduced conveniently.

Description

Technical Field

[0001] This utility model belongs to the field of motorcycle component technology, and relates to a muffler exhaust pipe, particularly a motorcycle muffler exhaust pipe. Background Technology

[0002] With the rapid development of technology and the improvement of people's living standards, various motor vehicles have become a common means of transportation in people's daily lives. Motorcycles, for example, are widely used. Motorcycles are motor vehicles, and due to their power, they generate considerable noise. Therefore, various noise reduction devices are widely used on motor vehicles, and motorcycles are typically equipped with mufflers to reduce noise.

[0003] Currently used motorcycle mufflers have a simple structure and poor noise reduction effect. The commonly used single exhaust structure has high exhaust resistance, which affects the noise reduction effect. Moreover, it cannot balance the exhaust back pressure while reducing noise, and water can enter the exhaust pipe during daily use and cannot be discharged.

[0004] Therefore, we propose a motorcycle muffler exhaust pipe that can undergo multiple volumetric changes to reduce exhaust gas density and pressure, thereby reducing noise. It can also change the direction of exhaust gas flow, reduce gas kinetic energy, generate turbulence, ensure exhaust efficiency while dispersing impact pressure and canceling noise, divide exhaust gas into several fine airflows, and absorb and cancel the generated noise through resonance. It can also form a drainage channel to discharge condensate and prevent corrosion, alleviate pressure changes, balance exhaust back pressure, and facilitate noise reduction. Utility Model Content

[0005] The purpose of this utility model is to address the aforementioned problems in the existing technology by proposing a motorcycle muffler exhaust pipe. The technical problem to be solved by this utility model is: how to muffle the noise generated when the motorcycle exhaust gas is discharged through the muffler exhaust pipe, while balancing the exhaust back pressure, and discharging condensate after the exhaust pipe cools down.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A motorcycle exhaust pipe includes an outlet end cap and an inlet end cap. An exhaust pipe body is disposed between the outlet end cap and the inlet end cap. Inside the exhaust pipe body, from front to back, are arranged a guide component, a baffle component, and a ventilation and silencing component. An outlet pipe is disposed between the outlet end cap and the ventilation and silencing component, and a guide pipe is disposed between the ventilation and silencing component and the baffle component. The inlet end cap is connected to an external engine outlet via a pipe. The guide component, baffle component, guide pipe, ventilation and silencing component, and outlet pipe enclose the exhaust pipe body. The interior is divided into the following sections from front to back: a gas expansion chamber between the inlet end cover and the guide component; a flow-guiding inlet chamber between the guide component and the baffle component; an outlet silencing chamber between the venting silencing component and the baffle component; and an expansion silencing chamber between the venting silencing component and the outlet end cover. The outlet silencing chamber and the expansion silencing chamber are connected by the venting silencing component. The inlet and outlet ends of the guide pipe are connected to the flow-guiding inlet chamber and the expansion silencing chamber, respectively. The inlet end of the outlet pipe is connected to the outlet silencing chamber, and the outlet end of the outlet pipe is connected to the outside.

[0008] The working principle of this invention is as follows: High-speed exhaust gas from a motorcycle engine enters the gas expansion chamber inside the exhaust pipe body through the intake end cover via a pipe. The gas enters a larger space, causing a sudden change in volume, reducing density and pressure, and decreasing velocity, thereby reducing pulse noise. After entering the exhaust pipe body, the high-speed exhaust gas impacts the guide component, buffering the exhaust gas velocity and reducing its kinetic energy. The guide component disperses the gas and creates rotating gas within the intake chamber, forming a turbulence effect. While ensuring exhaust efficiency, it disperses the exhaust gas impact pressure and generates turbulence noise through the turbulence effect. The sound waves of the turbulence noise interfere with the pulse noise. Subsequently, the exhaust gas enters the guide pipe from the intake chamber and then from the guide pipe into the expansion and silencing chamber between the exhaust end cover and the ventilation silencer. As the gas enters a larger space, its volume changes abruptly, its density and pressure decrease again, and its velocity slows down. Simultaneously, the exhaust gas passes through the ventilation and silencer components into the exhaust silencer chamber, where it is divided into several fine airflows, reducing the noise generated. Finally, it is discharged to the outside through the exhaust pipe. Through multiple pipe diameter changes, pressure fluctuations are attenuated, reducing the gas density and pressure. By repeatedly changing the gas flow direction, the gas kinetic energy is reduced, thereby reducing the gas velocity and pulse noise, achieving a silencing effect. At the same time, multiple mechanisms work together to form a drainage channel, preventing corrosion and reducing noise. The gas passes through the inlet end cover, gas expansion chamber, guide component, guide inlet chamber, guide pipe, expansion silencer chamber, ventilation and silencer components, exhaust silencer chamber, and exhaust pipe to form a silencing exhaust channel before finally being discharged.

[0009] The air intake end cover includes an air intake end cover plate, an annular fixing plate 1 is fixed on the outer side of the air intake end cover plate, a raised ring is provided on the rear side of the air intake end cover plate, a fixing groove is formed between the raised ring and the annular fixing plate 1, an air intake port is opened in the middle position of the air intake end cover plate, and a number of circumferentially distributed mounting screw holes are provided on the air intake end cover plate. The mounting screw holes are all located between the air intake port and the raised ring. The external engine exhaust pipe is screwed to the front side of the air intake end cover plate through a number of mounting screw holes, and the air intake port is connected to the external engine exhaust pipe.

[0010] With the above structure, the high-temperature and high-pressure exhaust gas generated by the external engine enters the exhaust pipe body from the air inlet through the exhaust pipe. The protruding ring and the annular fixing plate cooperate to facilitate the installation of the exhaust pipe body, and the mounting screw holes are used to install and fix the exhaust pipe of the external engine.

[0011] The air outlet cover includes an air outlet cover plate, and an annular fixing plate 2 is fixed on the outside of the air outlet cover plate. The inner diameter of the annular fixing plate 2 is equal to the inner diameter of the annular fixing plate 1. A fixing hole 3 is opened on the air outlet cover plate. The fixing hole 3 is located in an eccentric position and the center of the fixing hole 3 is located at the midpoint of the radius. The air outlet end of the air outlet pipe is fixed inside the fixing hole 3.

[0012] With the above structure, the air outlet cover includes an air outlet cover plate, and an annular fixing plate 2 is fixed on the outside of the air outlet cover plate. The inner diameter of the annular fixing plate 2 is equal to the inner diameter of the annular fixing plate 1. A fixing hole 3 is opened on the air outlet cover plate. The fixing hole 3 is located at an eccentric position, and the center of the hole is located at the midpoint of the radius. The air outlet end of the air outlet pipe is fixed inside the fixing hole 3.

[0013] The outer diameter of the exhaust pipe body is equal to the inner diameter of the annular fixing plate two. One end of the exhaust pipe body is fixed to the inner side of the annular fixing plate two, and the other end of the exhaust pipe body is fixed inside the fixing groove. A drain pipe is provided on the outer side of the exhaust pipe body, and the drain pipe is connected to the expansion silencing cavity. Three sets of fixing holes are provided on the exhaust pipe body from front to back. Each set of fixing holes consists of several circumferentially distributed fixing holes. The inner wall of the exhaust pipe is provided with a high-temperature resistant glass fiber sound-absorbing layer.

[0014] The above structure includes a high-temperature resistant glass fiber sound-absorbing layer to slow down the flow of exhaust gas and reduce noise; a number of fixing holes facilitate the installation of other components; and a drain pipe is used to drain condensed water when the silencer is cooled, preventing water accumulation and corrosion.

[0015] The guide component includes a base plate, the outer diameter of which is equal to the inner diameter of the exhaust pipe body. An annular mounting plate is fixed to the outside of the base plate. The annular mounting plate is fixed inside the exhaust pipe body through several fixing holes of the first set of fixing holes. An arc-shaped plate is provided on the annular mounting plate. A drainage hole is formed between the arc-shaped plate and the inner wall of the exhaust pipe body. Several circumferentially distributed spindle-shaped air guide holes are opened on the base plate. Arc-shaped guide plates are provided on both sides of the air guide holes. The two arc-shaped guide plates are in opposite directions. The arc-shaped guide plates are quarter-spindle shaped. The projected size of the arc-shaped guide plates is half of the air guide holes.

[0016] With the above structure, when the high-speed exhaust gas passes through the bottom plate, it impacts the bottom plate. At this time, the gas is obstructed and its speed decreases. Several arc-shaped guide plates guide the gas to form a rotating airflow, which creates turbulent noise reduction and generates turbulent noise with different phases. While ensuring exhaust efficiency, it interferes with pulse noise and cancels out some of the noise. The drainage hole formed between the arc-shaped plate and the inner wall of the exhaust pipe works with the drain pipe to discharge condensed water. The drainage hole facilitates the generation of spiral airflow and can also alleviate pressure changes, effectively balancing the exhaust back pressure.

[0017] The ventilation and silencing component includes a silencing plate, with an annular mounting plate two fixed to its outer side. The outer diameter of the annular mounting plate two is equal to the inner diameter of the exhaust pipe body. An arc-shaped plate two is provided on the annular mounting plate two, and the arc-shaped surface of the arc-shaped plate two is coplanar with that of the arc-shaped plate one. A drainage hole two is formed between the arc-shaped plate two and the inner wall of the exhaust pipe body, and the positions of the drainage hole two and the drainage hole one correspond. Two symmetrically arranged fixing holes one are opened on the silencing plate. The centroid of the drainage hole two is located on the line connecting the centers of the two fixing holes one. The air inlet end of the exhaust pipe is fixed inside the fixing hole one near the arc-shaped plate two. The axis of the fixing hole one near the arc-shaped plate two is collinear with the axis of the fixing hole three. Several ventilation holes are opened on the silencing plate, and the ventilation holes are symmetrically arranged on both sides of the two fixing holes one. The air outlet end of the guide pipe is fixed inside the fixing hole one away from the arc-shaped plate two.

[0018] With the above structure, the exhaust gas reaches the rear of the muffler through the guide pipe. The sudden change in volume reduces the gas velocity and decreases noise generation. At the same time, after passing through several vents on the muffler, the exhaust gas is divided into several fine airflows. The muffler generates a resonance effect under the action of these fine airflows, thereby absorbing and offsetting the noise generated when the gas passes through, reducing noise, and thus achieving a noise reduction effect. The two fixing holes are used to install and fix the guide pipe and the exhaust pipe, respectively. The drainage hole 2 works with the drainage hole 1 to form a drainage channel, while also mitigating pressure changes and balancing the exhaust back pressure.

[0019] The baffle includes a baffle, and an annular mounting plate three is fixed on the outer side of the baffle. The outer diameter of the annular mounting plate three is equal to the inner diameter of the exhaust pipe body. An arc-shaped plate three is provided on the annular mounting plate three. The arc-shaped surface of the arc-shaped plate three is coplanar with the arc-shaped surface of the arc-shaped plate two. A drainage hole three is formed between the arc-shaped plate two and the inner wall of the exhaust pipe body. The positions of the drainage hole three and the drainage hole two correspond. A fixing hole two is provided on the baffle. The fixing hole two is located in an eccentric position and the center of the fixing hole two is located at the midpoint of the radius. The air inlet end of the guide pipe is fixed inside the fixing hole two. The axis of the fixing hole two is collinear with the axis of the fixing hole one that is away from the arc-shaped plate two.

[0020] The above structure uses baffles to separate the main space of the exhaust pipe, thereby forming a gas expansion chamber and an expansion silencing chamber. This facilitates the guidance of exhaust gas and volume changes, thereby reducing gas velocity and pressure, and thus reducing noise. Drain hole three is used for drainage and to alleviate pressure changes, while generating sound waves with opposite phase, which helps to reduce noise. Fixing hole two is used to fix the guide pipe, thereby changing the gas flow direction, facilitating volume changes, and reducing noise generation.

[0021] Compared with existing technologies, this motorcycle muffler exhaust pipe has the following advantages:

[0022] 1. By cooperating with the exhaust pipe body, the exhaust gas enters the gas expansion chamber inside the exhaust pipe body from the intake end cover. The gas enters a larger space, causing a sudden change in volume, reducing density and pressure, and weakening noise.

[0023] 2. By using a flow guide to buffer the exhaust gas and guide its flow, the direction of the exhaust gas flow is changed, the kinetic energy of the gas is reduced, the impact pressure is dispersed while ensuring exhaust efficiency, and turbulence noise is generated through the turbulence effect. The noise is reduced by using the sound wave interference of the turbulence noise with the pulse noise.

[0024] 3. The gas enters the expansion and silencing cavity between the exhaust end cover and the ventilation and silencing component through the guide pipe, allowing the gas to enter a larger space, resulting in a sudden change in volume and a secondary reduction in noise.

[0025] 4. By changing the direction of exhaust gas flow through the ventilation and silencer components, the kinetic energy of the gas is reduced, and the exhaust gas is divided into several small airflows. Under the action of these small airflows, a resonance effect is generated, thereby absorbing and offsetting the noise generated when the gas passes through, thus reducing noise.

[0026] 5. The exhaust pipe body, together with the baffle, guide and ventilation silencer, forms a drainage channel to discharge condensate and prevent corrosion. The drainage channel helps to alleviate pressure changes, balance exhaust back pressure, and generate sound waves with opposite phase to reduce noise.

[0027] 6. The gas expansion chamber, the air inlet chamber, the air guide pipe, the expansion silencer chamber, the vent hole, the exhaust silencer chamber, and the exhaust pipe form a silencer and exhaust channel with good silencer effect and simple structure. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of this utility model.

[0029] Figure 2 This is a partially cutaway schematic diagram of this utility model.

[0030] Figure 3 This is a schematic diagram of the structure of the exhaust pipe body in this utility model.

[0031] Figure 4 This is a schematic diagram of the flow guide component in this utility model.

[0032] Figure 5 This is a structural schematic diagram of the ventilation and noise reduction component in this utility model.

[0033] Figure 6 This is a structural schematic diagram of the baffle component in this utility model.

[0034] Figure 7 This is a structural schematic diagram of the air intake end cover in this utility model.

[0035] Figure 8 This is a structural schematic diagram of the air outlet end cap in this utility model.

[0036] In the diagram, 1. Exhaust end cover; 2. Exhaust pipe body; 3. Intake end cover; 4. Guide component; 5. Baffle; 6. Guide pipe; 7. Ventilation and silencing component; 8. Exhaust pipe; 9. Fixing hole; 10. Drain pipe; 11. Arc-shaped plate one; 12. Arc-shaped guide plate; 13. Base plate; 14. Annular mounting plate one; 15. Arc-shaped plate two; 16. Fixing hole one; 17. Annular mounting plate two; 18. Vent hole; 19. Silencer plate; 20. Annular mounting plate three; 21. Arc-shaped plate three; 22. Fixing hole two; 23. Annular fixing plate one; 24. Mounting screw hole; 25. Intake port; 26. Protruding ring; 27. Annular fixing plate two; 28. Fixing hole three; 29. ​​Baffle; 30. Intake end cover plate; 31. Exhaust end cover plate. Detailed Implementation

[0037] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0038] like Figures 1-8As shown, this motorcycle's exhaust pipe includes an outlet end cap 1 and an inlet end cap 3. An exhaust pipe body 2 is located between the outlet end cap 1 and the inlet end cap 3. Inside the exhaust pipe body 2, from front to back, are arranged a guide component 4, a baffle component 5, and a ventilation and silencing component 7. An exhaust pipe 8 is located between the outlet end cap 1 and the ventilation and silencing component 7. A guide pipe 6 is located between the ventilation and silencing component 7 and the baffle component 5. The inlet end cap 3 is connected to the external engine exhaust port via a pipe. The guide component 4, baffle component 5, guide pipe 6, ventilation and silencing component 7, and exhaust pipe 8 direct the exhaust... The interior of the main body 2 of the trachea is divided into, from front to back, a gas expansion chamber between the inlet end cap 3 and the guide 4, a guide air inlet chamber between the guide 4 and the baffle 5, an outlet silencing chamber between the ventilation silencing component 7 and the baffle 5, and an expansion silencing chamber between the ventilation silencing component 7 and the outlet end cap 1. The outlet silencing chamber and the expansion silencing chamber are connected by the ventilation silencing component 7. The inlet and outlet ends of the guide pipe 6 are connected to the guide air inlet chamber and the expansion silencing chamber, respectively. The inlet end of the outlet pipe 8 is connected to the outlet silencing chamber, and the outlet end of the outlet pipe 8 is connected to the outside.

[0039] In this embodiment, high-speed exhaust gas from the motorcycle engine enters the gas expansion chamber inside the exhaust pipe body 2 through the intake end cover 3 via a pipe. The gas enters a larger space, causing a sudden change in volume, reducing density and pressure, and decreasing speed, thereby reducing pulse noise. After entering the exhaust pipe body 2, the high-speed exhaust gas impacts the guide member 4, buffering the exhaust gas velocity and reducing its kinetic energy. The guide member 4 disperses the gas and creates rotating gas within the guide intake chamber, forming a turbulence effect. While ensuring exhaust efficiency, it disperses the exhaust gas impact pressure and generates turbulence noise through the turbulence effect, interfering with the pulse noise. Subsequently, the exhaust gas enters the guide pipe 6 from the guide intake chamber and then enters the expansion and silencing chamber between the exhaust end cover 1 and the ventilation and silencing member 7. Entering a larger space, the volume changes abruptly, the density and pressure decrease again, and the speed decreases. At the same time, the exhaust gas enters the exhaust silencer chamber through the ventilation silencer 7. After being separated into several small airflows by the ventilation silencer 7, the noise generated is reduced. Finally, it is discharged to the outside through the exhaust pipe 8. Through multiple pipe diameter changes, the pressure fluctuations are attenuated, reducing the density and pressure of the gas. By changing the gas flow direction multiple times, the gas kinetic energy is reduced, thereby reducing the gas speed and reducing pulse noise, achieving the silencing effect. At the same time, multiple mechanisms work together to form a drainage channel to avoid corrosion and reduce noise. The exhaust gas passes sequentially through the silencer exhaust channel formed by the intake end cover 3, the gas expansion chamber, the guide 4, the guide intake chamber, the guide pipe 6, the expansion silencer chamber, the ventilation silencer 7, the exhaust silencer chamber, and the exhaust pipe 8, and is finally discharged.

[0040] The intake end cover 3 includes an intake end cover plate 30. An annular fixing plate 23 is fixed on the outer side of the intake end cover plate 30. A raised ring 26 is provided on the rear side of the intake end cover plate 30. A fixing groove is formed between the raised ring 26 and the annular fixing plate 23. An intake port 25 is provided in the middle position of the intake end cover plate 30. Several mounting screw holes 24 are provided on the intake end cover plate 30 in a circularly evenly distributed manner. The mounting screw holes 24 are all located between the intake port 25 and the raised ring 26. The external engine exhaust pipe is screwed to the front side of the intake end cover plate 30 through several mounting screw holes 24. The intake port 25 is connected to the external engine exhaust pipe.

[0041] In this embodiment, the high-temperature and high-pressure exhaust gas generated by the external engine enters the exhaust pipe body 2 from the air inlet 25 through the exhaust pipe. The protruding ring 26 and the annular fixing plate 23 cooperate to facilitate the installation of the exhaust pipe body 2. The mounting screw hole 24 is used to install and fix the exhaust pipe of the external engine.

[0042] The air outlet cover 1 includes an air outlet cover plate 31. An annular fixing plate 27 is fixed on the outer side of the air outlet cover plate 31. The inner diameter of the annular fixing plate 27 is equal to the inner diameter of the annular fixing plate 23. A fixing hole 38 is provided on the air outlet cover plate 31. The fixing hole 38 is located in an eccentric position and the center of the fixing hole 38 is located at the midpoint of the radius. The air outlet end of the air outlet pipe 8 is fixed inside the fixing hole 38.

[0043] In this embodiment, the second annular fixing plate 27 is used to fix the exhaust pipe body 2, and the third fixing hole 28 is used to fix the exhaust pipe 8, which facilitates exhaust and changes the flow direction of exhaust gas to reduce noise.

[0044] The outer diameter of the exhaust pipe body 2 is equal to the inner diameter of the annular fixing plate 27. One end of the exhaust pipe body 2 is fixed to the inner side of the annular fixing plate 27, and the other end of the exhaust pipe body 2 is fixed inside the fixing groove. A drain pipe 10 is provided on the outer side of the exhaust pipe body 2. The drain pipe 10 is connected to the expansion silencing cavity. Three sets of fixing holes are provided on the exhaust pipe body 2 from front to back. Each set of fixing holes consists of several circumferentially distributed fixing holes 9. The inner wall of the exhaust pipe is provided with a high-temperature resistant glass fiber sound-absorbing layer.

[0045] In this embodiment, the high-temperature resistant glass fiber sound-absorbing layer is used to slow down the flow speed of exhaust gas and reduce noise. The fixing holes 9 of the several fixing hole groups facilitate the installation of other components. The drain pipe 10 is used to drain the condensed water when the silencer pipe is cooled, so as to avoid water accumulation and corrosion.

[0046] The guide component 4 includes a base plate 13, the outer diameter of which is equal to the inner diameter of the exhaust pipe body 2. An annular mounting plate 14 is fixed to the outside of the base plate 13. The annular mounting plate 14 is fixed inside the exhaust pipe body 2 through several fixing holes 9 of the first set of fixing holes. An arc-shaped plate 11 is provided on the annular mounting plate 14. A drainage hole is formed between the arc-shaped plate 11 and the inner wall of the exhaust pipe body 2. Several circumferentially distributed spindle-shaped air guide holes are opened on the base plate 13. An arc-shaped guide plate 12 is provided on both sides of the air guide hole, and the two arc-shaped guide plates 12 are in opposite directions. The arc-shaped guide plate 12 is a quarter spindle shape, and the projected size of the arc-shaped guide plate 12 is half of the air guide hole.

[0047] In this embodiment, when the high-speed exhaust gas passes through the base plate 13, it impacts the base plate 13. At this time, the gas is obstructed and its speed decreases. The gas is guided by several arc-shaped guide plates 12 to form a rotating airflow, which generates turbulent noise reduction and produces turbulent noise with different phases. While ensuring exhaust efficiency, it interferes with pulse noise and cancels out some of the noise. The drain hole formed between the arc-shaped plate 11 and the inner wall of the exhaust pipe body 2 cooperates with the drain pipe 10 to discharge the condensed water. The drain hole facilitates the generation of spiral airflow and can alleviate pressure changes, effectively balancing the exhaust back pressure.

[0048] The ventilation muffler 7 includes a muffler plate 19. An annular mounting plate 2 17 is fixed to the outer side of the muffler plate 19. The outer diameter of the annular mounting plate 2 17 is equal to the inner diameter of the exhaust pipe body 2. An arc-shaped plate 2 15 is provided on the annular mounting plate 2 17. The arc-shaped plate 2 15 is coplanar with the arc-shaped surface of the arc-shaped plate 11. A drainage hole 2 is formed between the arc-shaped plate 2 15 and the inner wall of the exhaust pipe body 2, and the position of the drainage hole 2 corresponds to that of the drainage hole 1. Two symmetrically arranged fixing devices are provided on the muffler plate 19. The centroid of hole 16 and drainage hole 2 is located on the line connecting the centers of the two fixed holes 16. The air inlet end of the air outlet pipe 8 is fixed inside the fixed hole 16 near the arc plate 25. The axis of the fixed hole 16 near the arc plate 25 is collinear with the axis of the fixed hole 3 28. Several vent holes 18 are provided on the sound-absorbing plate 19. Several vent holes 18 are symmetrically arranged on both sides of the two fixed holes 16. The air outlet end of the guide pipe 6 is fixed inside the fixed hole 16 away from the arc plate 25.

[0049] In this embodiment, the exhaust gas reaches the rear side of the muffler plate 19 through the guide pipe 6. The gas velocity is reduced by a sudden change in volume, thus reducing noise generation. At the same time, after the exhaust gas passes through several vent holes 18 on the muffler plate 19, it is divided into several small airflows. The muffler plate 19 generates a resonance effect under the action of several small airflows, thereby absorbing and offsetting the noise generated when the gas passes through, reducing the noise, and thus achieving the muffler effect. The two fixing holes 16 are used to install and fix the guide pipe 6 and the exhaust pipe 8, respectively. The drainage hole 2, together with the drainage hole 1, forms a drainage channel, while also alleviating the pressure change and balancing the exhaust back pressure.

[0050] The baffle component 5 includes a baffle 29, and an annular mounting plate 20 is fixed on the outside of the baffle 29. The outer diameter of the annular mounting plate 20 is equal to the inner diameter of the exhaust pipe body 2. An arc plate 21 is provided on the annular mounting plate 20. The arc surface of the arc plate 21 is coplanar with the arc surface of the arc plate 15. A drainage hole 3 is formed between the arc plate 15 and the inner wall of the exhaust pipe body 2. The positions of the drainage hole 3 and the drainage hole 2 are corresponding. A fixing hole 22 is provided on the baffle 29. The fixing hole 22 is located in an eccentric position and the center of the fixing hole 22 is located at the midpoint of the radius. The air intake end of the guide pipe 6 is fixed inside the fixing hole 22. The axis of the fixing hole 22 is collinear with the axis of the fixing hole 16 away from the arc plate 15.

[0051] In this embodiment, the space of the exhaust pipe body 2 is separated by the baffle 29, thereby forming a gas expansion chamber and an expansion silencing chamber, which facilitates the guidance of exhaust gas and volume change, thereby reducing gas velocity and pressure, and thus reducing noise. The drain hole three is used for drainage and to alleviate pressure change, while generating a sound pattern with opposite phase, which helps to reduce noise. The fixing hole two 22 is used to fix the guide pipe 6, thereby changing the gas flow direction, facilitating volume change, and reducing noise generation.

[0052] The working principle of this utility model is as follows: The high-temperature and high-pressure exhaust gas generated by the external engine of the motorcycle enters the gas expansion chamber inside the exhaust pipe body 2 through the exhaust pipe from the intake port 25. The gas enters a larger space, resulting in a sudden change in volume, a decrease in density and pressure, and a reduction in speed, thereby reducing pulse noise. After the high-speed exhaust gas enters the exhaust pipe body 2, it impacts the bottom plate 13 when passing through it. At this time, the gas is obstructed and its speed decreases. The gas is guided by several arc-shaped guide plates 12 and forms a vortex inside the guide intake chamber. The airflow is reversed, creating turbulent noise reduction and generating turbulent noise with different phases. While ensuring exhaust efficiency, this interferes with pulse noise and cancels out some of the noise. Subsequently, the exhaust gas enters the expansion silencer chamber between the exhaust end cover 1 and the ventilation silencer 7 through the guide pipe 6. The gas enters a larger space, causing a sudden change in volume, which reduces the density and pressure again, and lowers the velocity. The exhaust gas then enters the guide pipe 6 through the guide intake chamber and enters the expansion silencer chamber between the exhaust end cover 1 and the ventilation silencer 7 from the guide pipe 6, reaching the rear side of the silencer plate 19. This sudden change in volume further reduces the noise. Low gas velocity reduces noise generation. Simultaneously, after passing through several vents 18 on the silencer plate 19, the exhaust gas is divided into several fine airflows that enter the exhaust silencer chamber. The silencer plate 19 resonates under the action of these fine airflows, absorbing and offsetting the noise generated during gas passage, thus reducing noise and achieving a silencing effect. Finally, the gas is discharged to the outside through the exhaust pipe 8. Through multiple pipe diameter changes, pressure fluctuations are attenuated, reducing the gas density and pressure. By repeatedly changing the gas flow direction, the gas kinetic energy is reduced, thereby lowering the gas velocity and reducing noise. The pulse noise is reduced to achieve a silencing effect. At the same time, multiple mechanisms work together to prevent corrosion and reduce noise. Drain hole 1, drain hole 2, drain hole 3 and drain pipe 10 work together to form a drainage channel. The drainage channel is used to drain water and alleviate pressure changes, balance exhaust back pressure, and at the same time generate sound waves with opposite phase to reduce noise. The exhaust gas passes through the silencing exhaust channel formed by the intake end cover 3, gas expansion chamber, guide component 4, guide intake chamber, guide pipe 6, expansion silencing chamber, ventilation silencing component 7, exhaust silencing chamber and exhaust pipe 8 in sequence, and is finally discharged.

[0053] In summary, by cooperating with the exhaust pipe body 2, the exhaust gas enters the gas expansion chamber inside the exhaust pipe body 2 from the intake end cover 3. The gas enters a larger space, resulting in a sudden change in volume, a decrease in density and pressure, and a reduction in noise.

[0054] The exhaust gas is buffered by the guide component 4 and the exhaust gas is guided to change the direction of exhaust gas flow and reduce the gas kinetic energy. While ensuring exhaust efficiency, the impact pressure is dispersed, and turbulence noise is generated through the turbulence effect. The noise is reduced by the sound wave interference of the turbulence noise with the pulse noise.

[0055] The gas enters the expansion and silencing cavity between the air outlet cover 1 and the ventilation and silencing component 7 through the guide pipe 6. The gas enters a larger space, the volume changes suddenly, and the noise is reduced a second time.

[0056] By changing the direction of exhaust gas flow through the ventilation and silencing component 7, reducing the kinetic energy of the gas, and dividing the exhaust gas into several fine airflows, a resonance effect is generated under the action of these fine airflows, thereby absorbing and offsetting the noise generated when the gas passes through, and reducing the noise.

[0057] The exhaust pipe body 2, together with the baffle 5, the guide 4 and the ventilation and silencing component 7, forms a drainage channel to discharge condensate and prevent corrosion. The drainage channel helps to alleviate pressure changes, balance exhaust back pressure, and at the same time generate sound patterns with opposite phases, which helps to reduce noise.

[0058] The gas expansion chamber, the air inlet chamber, the air guide pipe, the expansion silencer chamber, the vent hole, the exhaust silencer chamber, and the exhaust pipe form a silencer exhaust channel with good silencer effect and simple structure.

[0059] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model 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 this utility model or exceeding the scope defined by the appended claims.

Claims

1. A motorcycle muffler exhaust pipe, comprising an outlet end cap (1) and an intake end cap (3), characterized in that, An exhaust pipe body (2) is provided between the exhaust end cover (1) and the intake end cover (3). Inside the exhaust pipe body (2), from front to back, there are a guide (4), a baffle (5), and a ventilation and silencing component (7). An exhaust pipe (8) is provided between the exhaust end cover (1) and the ventilation and silencing component (7). A guide pipe (6) is provided between the ventilation and silencing component (7) and the baffle (5). The intake end cover (3) is connected to the external engine exhaust port through a pipe. The guide (4), baffle (5), guide pipe (6), ventilation and silencing component (7), and exhaust pipe (8) connect the exhaust pipe body (2) inside... The part is divided into the following sections from front to back: the gas expansion chamber between the air inlet end cover (3) and the guide (4), the guide air inlet chamber between the guide (4) and the baffle (5), the discharge silencer chamber between the ventilation silencer (7) and the baffle (5), and the expansion silencer chamber between the ventilation silencer (7) and the outlet end cover (1). The discharge silencer chamber and the expansion silencer chamber are connected by the ventilation silencer (7). The air inlet and outlet ends of the guide pipe (6) are connected to the guide air inlet chamber and the expansion silencer chamber, respectively. The air inlet end of the outlet pipe (8) is connected to the discharge silencer chamber. The air outlet end of the outlet pipe (8) is connected to the outside.

2. A motorcycle muffler exhaust pipe according to claim 1, characterized in that, The air intake end cover (3) includes an air intake end cover plate (30), an annular fixing plate (23) is fixed on the outer side of the air intake end cover plate (30), a raised ring (26) is provided on the rear side of the air intake end cover plate (30), a fixing groove is formed between the raised ring (26) and the annular fixing plate (23), an air intake port (25) is provided in the middle position of the air intake end cover plate (30), and a number of mounting screw holes (24) are provided on the air intake end cover plate (30) in a circumferentially evenly distributed manner. The mounting screw holes (24) are all located between the air intake port (25) and the raised ring (26). The external engine exhaust pipe is screwed to the front side of the air intake end cover plate (30) through a number of mounting screw holes (24), and the air intake port (25) is connected to the external engine exhaust pipe.

3. A motorcycle muffler exhaust pipe according to claim 2, characterized in that, The air outlet cover (1) includes an air outlet cover plate (31). An annular fixing plate two (27) is fixed on the outside of the air outlet cover plate (31). The inner diameter of the annular fixing plate two (27) is equal to the inner diameter of the annular fixing plate one (23). A fixing hole three (28) is opened on the air outlet cover plate (31). The fixing hole three (28) is located in an eccentric position and the center of the fixing hole three (28) is located at the midpoint of the radius. The air outlet end of the air outlet pipe (8) is fixed inside the fixing hole three (28).

4. A motorcycle muffler exhaust pipe according to claim 3, characterized in that, The outer diameter of the exhaust pipe body (2) is equal to the inner diameter of the annular fixing plate two (27). One end of the exhaust pipe body (2) is fixed to the inner side of the annular fixing plate two (27), and the other end of the exhaust pipe body (2) is fixed inside the fixing groove. A drain pipe (10) is provided on the outer side of the exhaust pipe body (2). The drain pipe (10) is connected to the expansion silencing cavity. Three sets of fixing holes are provided on the exhaust pipe body (2) from front to back. Each set of fixing holes consists of several circumferentially distributed fixing holes (9). The inner wall of the exhaust pipe is provided with a high-temperature resistant glass fiber sound-absorbing layer.

5. A motorcycle muffler exhaust pipe according to claim 4, characterized in that, The guide component (4) includes a base plate (13). The outer diameter of the base plate (13) is equal to the inner diameter of the exhaust pipe body (2). An annular mounting plate (14) is fixed on the outside of the base plate (13). The annular mounting plate (14) is fixed inside the exhaust pipe body (2) through several fixing holes (9) of the first set of fixing holes. An arc plate (11) is provided on the annular mounting plate (14). A drainage hole is formed between the arc plate (11) and the inner wall of the exhaust pipe body (2). Several circumferentially distributed spindle-shaped air guide holes are opened on the base plate (13). An arc-shaped guide plate (12) is provided on both sides of the air guide hole. The two arc-shaped guide plates (12) are in opposite directions. The arc-shaped guide plate (12) is a quarter spindle shape. The projected size of the arc-shaped guide plate (12) is half of the air guide hole.

6. A motorcycle muffler exhaust pipe according to claim 5, characterized in that, The ventilation silencer (7) includes a silencer plate (19). An annular mounting plate two (17) is fixed on the outer side of the silencer plate (19). The outer diameter of the annular mounting plate two (17) is equal to the inner diameter of the exhaust pipe body (2). An arc plate two (15) is provided on the annular mounting plate two (17). The arc surface of the arc plate two (15) is coplanar with the arc surface of the arc plate one (11). A drainage hole two is formed between the arc plate two (15) and the inner wall of the exhaust pipe body (2). The position of the drainage hole two corresponds to that of the drainage hole one. Two symmetrically arranged fixing holes are provided on the silencer plate (19). The centroid of the drainage hole 2 is located on the line connecting the centers of the two fixed holes 1 (16). The air inlet end of the air outlet pipe (8) is fixed inside the fixed hole 1 (16) near the arc plate 2 (15). The axis of the fixed hole 1 (16) near the arc plate 2 (15) is collinear with the axis of the fixed hole 3 (28). Several ventilation holes (18) are provided on the soundproof plate (19). Several ventilation holes (18) are symmetrically arranged on both sides of the two fixed holes 1 (16). The air outlet end of the guide pipe (6) is fixed inside the fixed hole 1 (16) away from the arc plate 2 (15).

7. A motorcycle muffler exhaust pipe according to claim 6, characterized in that, The baffle (5) includes a baffle (29), and an annular mounting plate three (20) is fixed on the outside of the baffle (29). The outer diameter of the annular mounting plate three (20) is equal to the inner diameter of the exhaust pipe body (2). An arc plate three (21) is provided on the annular mounting plate three (20). The arc surface of the arc plate three (21) is coplanar with the arc surface of the arc plate two (15). A drainage hole three is formed between the arc plate two (15) and the inner wall of the exhaust pipe body (2). The positions of the drainage hole three and the drainage hole two are corresponding. A fixing hole two (22) is provided on the baffle (29). The fixing hole two (22) is located in an eccentric position and the center of the fixing hole two (22) is located at the midpoint of the radius. The air inlet end of the guide pipe (6) is fixed inside the fixing hole two (22). The axis of the fixing hole two (22) is collinear with the axis of the fixing hole one (16) away from the arc plate two (15).

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