A multi-stage muffler for a motorcycle

Abstract

The present application relates to the technical field of motorcycle silencing, in particular to a multi-stage silencing device for motorcycle, which comprises an air inlet, a shell, a first-stage silencing mechanism, a second-stage silencing mechanism, a third-stage silencing mechanism and an air outlet, the air inlet is fixedly installed on the motorcycle, one end of the air inlet is fixedly installed with the first-stage silencing mechanism, the right side of the first-stage silencing mechanism is fixedly installed with the second-stage silencing mechanism, the right side of the second-stage silencing mechanism is fixedly installed with the third-stage silencing mechanism, and the right side of the third-stage silencing mechanism is fixedly installed with the air outlet, the present application can grade manage the preferences and gears of the driver under different driving requirements, and automatically adjust the silencing device corresponding to different motion states, thereby improving the service life of the silencing system.

Description

TECHNICAL FIELD

[0001] The present application relates to the motorcycle muffler technical field, specifically relates to a kind of motorcycle multistage muffler. BACKGROUND

[0002] The existing motorcycle muffler technology mostly adopts cylinder muffler technology, and the cylinder muffler is generally composed of exhaust pipe, connecting screw sleeve, muffler cylinder and cylinder core. Oil-impregnated asbestos sealing ring is installed in the connecting screw sleeve to prevent gas leakage between the exhaust pipe and the muffler cylinder. Several partitions are welded in the muffler cylinder to divide the muffler cylinder into several muffling cavities. There are inverted triangular flow guide grooves and many small holes on the cylinder core. When the high-temperature exhaust gas of the engine enters the muffler at high speed through the exhaust pipe, the cross-sectional area of the muffler cylinder gradually increases, the gas flow is expanded, the flow rate is reduced, and the strong pulsating noise is attenuated. When the gas flow continues to flow through each expansion chamber, the gas flow can only pass through the throttle holes on the partitions and the cylinder core due to the obstruction of the partitions. Therefore, the gas flow is suddenly compressed and divided into many fine streams, and then suddenly expanded. This sudden change multiple times reduces the exhaust noise.

[0003] Meanwhile, Lifan Industrial (Group) Co., Ltd. invented a motorcycle muffler system (application number: CN200710092873.X, publication date: March 23, 2011). The system is provided with a muffler pipe in the muffler body. The front end of the muffler body is connected with the intake pipe through a front joint sleeve, and the rear end of the muffler body is connected with the tail pipe through a rear joint sleeve. An outer cylinder is arranged outside the muffler body. The front and rear ends of the outer cylinder are connected with the front and rear joint sleeves, respectively. An annular air convection cavity is formed between the outer cylinder and the muffler body. The air convection cavity is communicated with the outside through the air inlet on the bottom surface of the outer cylinder and the air outlet on the top surface of the outer cylinder. The combination of heat insulation and natural air flow cooling can control the surface temperature of the muffler outer cylinder at about 50°C. Even if a person directly touches the muffler outer cylinder, it will not cause burns. This fundamentally eliminates the safety hazards caused by the high temperature of the muffler outer wall. The system has the characteristics of simple structure, easy implementation and strong universality.

[0004] Although the above method can achieve the muffling effect of the motorcycle, the above method is a single-stage muffling, that is, the exhaust gas is discharged after only one treatment. However, this treatment method is only suitable for small displacement motorcycles. When the displacement of the motorcycle is too large, the exhaust gas flow rate will be too fast. At this time, the single-stage muffling system will cause the noise of the motorcycle to be still too large. Especially for the muffling device used on some racing motorcycles, single-stage muffling not only does not have good muffling effect, but also easily causes the temperature of the muffling device to be as high as 300-500°C. The high temperature of the muffling device easily causes unnecessary harm to the rider.

[0005] Meanwhile, the exhaust muffler structure in the prior art is relatively single, and generally cannot be changed according to the use condition, when the motorcycle speed is too fast, at this time, the motorcycle exhausts more tail gas, and the noise generated thereby needs to be further processed, when the motorcycle speed is reduced, at this time, the motorcycle exhausts less tail gas, at this time, the ordinary single-stage silencing system can meet the use, the two conditions correspond to different needs of the driver, the silencing system in the prior art cannot grade manage the preferences and gears of the driver, thereby reducing the service life of the silencing system.

[0006] Therefore, the motorcycle multi-stage silencing device can improve the above problems. SUMMARY

[0007] The technical problem to be solved by the present application is that the motorcycle silencing generally adopts a single-stage silencing method, that is, the tail gas is discharged after being processed in one way, but this processing method is only applicable to small displacement motorcycles, when the displacement of the motorcycle is too large, the exhaust gas flow rate generated thereby is too fast, at this time, the use of the single-stage silencing system will cause the noise generated by the motorcycle to be still too large, thereby affecting the driving experience of the driver.

[0008] The present application provides the following technical scheme: a motorcycle multi-stage silencing device, the air inlet is fixedly installed on the motorcycle, the air inlet is used to convey the gas and noise generated by the motorcycle to the first-stage silencing mechanism, one end of the air inlet is fixedly installed with the first-stage silencing mechanism, the first-stage silencing mechanism is used to preliminarily absorb the noise generated by the motorcycle, and filter the impurities in the motorcycle tail gas, the right side of the first-stage silencing mechanism is fixedly installed with the second-stage silencing mechanism, the second-stage silencing mechanism is used to further absorb the noise generated by the motorcycle, the right side of the second-stage silencing mechanism is fixedly installed with the third-stage silencing mechanism, the third-stage silencing mechanism is used to automatically adjust the silencing mode according to the speed of the motorcycle, the right side of the third-stage silencing mechanism is fixedly installed with the air outlet, and the air outlet is used to discharge the motorcycle tail gas.

[0009] The first-stage silencing mechanism comprises a filter column, an absorption felt and a silencing shell, one end of the air inlet is fixedly installed with the filter column, the filter column is used to uniformly disperse the noise generated by the internal combustion engine on the absorption felt, the filter column is fixedly installed with the absorption felt on the same axis, the absorption felt is used to adsorb the impurities generated by the internal combustion engine and preliminarily absorb the noise generated by the internal combustion engine, the absorption felt is sleeved with the silencing shell, the silencing shell is fixedly installed on the shell, and the silencing shell is used to further absorb the noise escaping from the absorption felt.

[0010] When the noise of the exhaust gas produced by the combustion of the internal combustion engine, the sound wave and the exhaust gas with impurities are directly discharged into the filter column, the sound wave and the exhaust gas with impurities are evenly scattered into the absorption felt through the filter column, and the sound wave and the exhaust gas with impurities pass through the multi-layer absorption felt; after passing through the multi-layer absorption felt, the impurities in the sound wave and the exhaust gas with impurities are adsorbed by the absorption felt, and at the same time, the sound wave is changed in direction due to the blocking of the sound-absorbing shell, and the sound wave changed in direction flows to the secondary sound-absorbing mechanism along the direction of the sound-absorbing mechanism.

[0011] The filter column is a cylindrical structure with one end open and the other end closed, and a plurality of through holes are arranged on the filter column; by using the filter column with the closed bottom, after the sound wave and the exhaust gas with impurities enter the filter column, the sound wave and the exhaust gas with impurities collide with the bottom of the filter column, so that the sound wave and the exhaust gas with impurities change direction for the first time, which means that the sound wave and the exhaust gas with impurities are weakened for the first time; at the same time, a plurality of through holes are arranged on the filter column, and the sound wave and the exhaust gas with impurities enter the absorption felt through the through holes in the filter column.

[0012] The absorption felt is selected from glass fiber felt; the glass fiber felt is mainly made of glass wool and has a high sound absorption coefficient, and the sound wave on the surface of the glass fiber felt will not produce any wave reflection, so that the noise can be effectively absorbed; at the same time, the glass fiber felt also has good moisture-proof performance, and can maintain a certain flatness under certain humidity conditions, so that it is more stable, and the glass fiber felt also has good fireproof performance and can better resist high temperature, so that it can work normally in the high-temperature environment of the exhaust gas of the motorcycle; finally, the glass fiber felt also has good heat insulation performance, and the use of the glass fiber felt can effectively prevent the high-temperature exhaust gas from transferring heat to the surface of the sound-absorbing device to scald the nearby workers.

[0013] The secondary sound-absorbing mechanism comprises a pipe and a sound-absorbing chamber, the sound-absorbing chamber is fixedly installed on the right side of the sound-absorbing shell, and the sound-absorbing chamber is used for further sound-absorbing the sound wave processed by the primary sound-absorbing mechanism; one end of the pipe is fixedly installed on the sound-absorbing chamber, and the other end of the pipe is fixedly connected with another sound-absorbing chamber, and the pipe is used for transporting the sound wave to another sound-absorbing chamber.

[0014] When the noise processed by the primary sound-absorbing mechanism enters the secondary sound-absorbing mechanism, the noise enters the sound-absorbing chamber, and since the sound-absorbing chamber is a cylindrical hollow structure, the noise will be reflected multiple times in the sound-absorbing chamber, and then enters the next sound-absorbing chamber through the pipe, and after passing through multiple sound-absorbing chambers, the noise enters the last tertiary sound-absorbing mechanism for further processing and then is discharged.

[0015] The sound attenuation bin and the through pipe are staggered and installed, and the through pipe installation position between every two sound attenuation bins is symmetrical to the previous through pipe installation position with respect to the diameter of the sound attenuation bin; the advantage of this installation mode is that the moving path of sound waves and exhaust gas can be increased, and the longer the moving path of the noise and exhaust gas generated by the motorcycle, the better the noise reduction effect; the sound attenuation bin and the through pipe can be multiple, and different numbers of sound attenuation bins and through pipes can be set according to the displacement of the motorcycle; because the larger the displacement of the motorcycle, the greater the noise generated, therefore, the number of sound attenuation bins and through pipes required to be installed for motorcycles of different displacements is also different, which can be selected as needed.

[0016] The filter screen is fixedly installed in the through pipe; during the flow of noise and exhaust gas, part of the impurities will flow with the exhaust gas, therefore, the filter screen is fixedly installed in the through pipe, which can filter out the impurities in the exhaust gas and isolate the impurities outside the through pipe, so as to further ensure the normal use of the secondary sound attenuation mechanism and increase the service life of the secondary sound attenuation mechanism.

[0017] The third sound attenuation mechanism includes a transition bin, an exhaust bin, a sound attenuation plate, a pressing plate, a spring and a connecting rope; the transition bin is fixedly installed on the right side of the secondary sound attenuation mechanism, and is used to transport the sound waves and exhaust gas processed by the secondary sound attenuation mechanism into the exhaust bin; the exhaust bin is fixedly installed on the right side of the transition bin, and is used to discharge the remaining sound waves and exhaust gas into the air; the sound attenuation plate is hingedly connected in the exhaust bin, and is used to block the transmission of sound waves, thereby reducing noise; the pressing plate is symmetrically arranged outside the exhaust bin, and is used to cooperate with the sound attenuation plate to achieve the noise reduction effect; the spring is fixedly installed between the pressing plate and the exhaust bin, and is used to reset the pressing plate; and the connecting rope is fixedly installed between the pressing plate and the exhaust bin, and is used to control the positional relationship between the pressing plate and the sound attenuation plate.

[0018] During the movement of the motorcycle, the faster the motorcycle, the greater the pressure on the pressing plate, so the greater the pressing amplitude of the pressing plate; when the pressing plate is pressed down, the sound attenuation plate will rotate along the hinge shaft under the action of gravity, that is, the sound attenuation plate is lowered in the exhaust bin, so that the contact area between the sound waves in the exhaust bin and the sound attenuation plate is larger, and the sound attenuation effect of the third sound attenuation mechanism is better; when the motorcycle stops moving, the pressing plate cannot be pressed by the fluid, and the pressing plate will return to the original position under the action of the spring; because the connecting rope is installed between the pressing plate and the sound attenuation plate, the sound attenuation plate will also return to the original position under the action of the connecting rope.

[0019] The sound-absorbing plate adopts a damping sound-absorbing plate; sound insulation of the damping sound-absorbing plate is mainly because the damping material can weaken the intensity of the bending vibration of the metal plate; when the metal bends and vibrates, the vibration energy is quickly transmitted to the sound insulation material of the closely vibrating source, causing friction and mutual displacement inside the damping sound insulation material; because the internal loss and internal friction of the damping material are large, a part of the vibration energy of the metal plate is converted into heat energy and dissipated, thereby weakening the vibration; meanwhile, the damping sound-absorbing plate also has the advantages of safety, lightness, heat resistance and the like, and therefore the damping sound-absorbing plate can be well applied to the three-stage sound-absorbing mechanism.

[0020] The sliding door is fixedly installed between the first-stage sound-absorbing mechanism and the second-stage sound-absorbing mechanism and the third-stage sound-absorbing mechanism, sliding rails are formed in the upper portion of the sliding door; a piston rod is fixedly installed on the sliding door, and a piston is fixedly installed at the end portion of the piston rod; the piston and the sliding rails are filled with a thermal expansion and contraction gas.

[0021] The beneficial effects of the present application are as follows:

[0022] 1. The present application designs a multi-stage sound-absorbing mechanism, and the first-stage sound-absorbing mechanism, the second-stage sound-absorbing mechanism and the third-stage sound-absorbing mechanism cooperate with each other, so that the noise generated by the motorcycle is processed in stages; the first-stage sound-absorbing mechanism can preliminarily absorb the noise emitted by the motorcycle, and can also adsorb a large amount of impurities in the motorcycle exhaust gas; the second-stage sound-absorbing mechanism can further weaken the sound wave processed by the first-stage sound-absorbing mechanism by changing the moving direction; in this way, the motorcycle can still have good sound-absorbing effect when driving at high speed.

[0023] 2. The present application designs a new three-stage sound-absorbing mechanism, which can automatically adjust the position of the sound-absorbing plate according to the speed; without any power source, the inclination degree of the sound-absorbing plate is changed according to the speed; meanwhile, after the motorcycle stops, the whole three-stage sound-absorbing mechanism can also return to the original position; the preferences and gears of the driver can be managed in stages under different driving needs of the driver, so as to improve the service life of the sound-absorbing system. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0025] Figure 1 It is the overall schematic diagram of the present application;

[0026] Figure 2 is a schematic diagram of the internal structure of the present application;

[0027] Figure 3 is a schematic diagram of the first-stage sound-absorbing mechanism of the present application;

[0028] Figure 4 is a schematic diagram of the filter column of the present application;

[0029] Figure 5 is a sectional view of the first-stage sound-absorbing mechanism of the present application;

[0030] Figure 6 is a schematic diagram of the second-stage sound-absorbing mechanism of the present application;

[0031] Figure 7 is a schematic diagram of the through pipe of the present application;

[0032] Figure 8 is a schematic diagram of the third-stage sound-absorbing mechanism of the present application;

[0033] Figure 9 is a sectional view of the third-stage sound-absorbing mechanism of the present application;

[0034] Figure 10 is a schematic diagram of the gas flow of the present application;

[0035] Figure 11 is a schematic diagram of the position of the piston and piston rod of the present application.

[0036] In the figure: 1, air inlet; 2, outer shell; 21, sliding door; 22, sliding rail; 23, piston rod; 24, piston; 3, first-stage sound-absorbing mechanism; 31, filter column; 32, absorbing felt; 33, sound-absorbing shell; 34, through hole; 4, second-stage sound-absorbing mechanism; 41, through pipe; 42, sound-absorbing compartment; 43, filter screen; 5, third-stage sound-absorbing mechanism; 51, transition compartment; 52, exhaust compartment; 53, sound-absorbing plate; 54, pressing plate; 55, spring; 56, connecting rope; 6, air outlet. DETAILED DESCRIPTION

[0037] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in combination with the drawings in the specification and specific embodiments.

[0038] First embodiment

[0039] As Figures 1 to 10As shown, the air inlet 1 is fixedly installed on the motorcycle, and the air inlet 1 is used to transport the gas and noise emitted by the motorcycle to the first-stage silencing mechanism 3; one end of the air inlet 1 is fixedly installed with the first-stage silencing mechanism 3, and the first-stage silencing mechanism 3 is used to preliminarily absorb the noise emitted by the motorcycle and filter the impurities in the motorcycle exhaust gas; the right side of the first-stage silencing mechanism 3 is fixedly installed with the second-stage silencing mechanism 4; the second-stage silencing mechanism 4 is used to further absorb the noise emitted by the motorcycle; the right side of the second-stage silencing mechanism 4 is fixedly installed with the third-stage silencing mechanism 5, and the third-stage silencing mechanism 5 is used to automatically adjust the silencing mode according to the speed of the motorcycle; the right side of the third-stage silencing mechanism 5 is fixedly installed with the air outlet 6, and the air outlet 6 is used to discharge the motorcycle exhaust gas.

[0040] During the driving of the motorcycle, a large amount of noise will be caused due to the combustion of the internal combustion engine, and the existing technology usually adopts the way of installing a silencing pipe at the tail of the motorcycle to absorb the noise of the motorcycle; however, a single-stage silencing device is usually used to silence the motorcycle, and however, the use of a single-stage silencing device to silence the motorcycle will cause incomplete noise absorption; the above motorcycle multi-stage silencing device can perform staged processing on the noise generated by the motorcycle, the first-stage silencing mechanism 3 can preliminarily absorb the noise emitted by the motorcycle, and also can adsorb a large amount of impurities in the motorcycle exhaust gas; the second-stage silencing mechanism 4 can further weaken the sound wave processed by the first-stage silencing mechanism 3 by changing the moving direction; the third-stage silencing mechanism 5 further weakens the sound wave processed by the first-stage silencing mechanism 3 and the second-stage silencing mechanism 4, and simultaneously, the third-stage silencing mechanism 5 can automatically adjust the silencing degree according to the need.

[0041] As shown in the drawings, Figures 2 to 5 As shown, the first-stage silencing mechanism 3 includes a filter column 31, an absorption felt 32, and a silencing shell 33, one end of the air inlet 1 is fixedly installed with the filter column 31, and the filter column 31 is used to uniformly disperse the noise generated by the internal combustion engine on the absorption felt 32; the filter column 31 is fixedly installed with the absorption felt 32 on the same axis, and the absorption felt 32 is used to adsorb the impurities generated by the internal combustion engine and preliminarily absorb the noise generated by the internal combustion engine; the absorption felt 32 is sleeved with the silencing shell 33, and the silencing shell 33 is fixedly installed on the shell 2, and the silencing shell 33 is used to further absorb the noise escaping from the absorption felt 32;

[0042] When the noise is generated by the exhaust gas of the internal combustion engine, the sound wave and the exhaust gas with impurities are directly discharged into the filter column 31, and the sound wave and the exhaust gas with impurities are evenly scattered into the absorption felt 32 through the filter column 31. Since the absorption felt 32 is arranged in a spiral shape, the sound wave and the exhaust gas with impurities pass through multiple layers of absorption felt 32. After passing through the multiple layers of absorption felt 32, the impurities in the sound wave and the exhaust gas with impurities are adsorbed by the absorption felt 32. At the same time, due to the blocking of the sound-absorbing shell 33, the sound wave changes direction and flows to the secondary sound-absorbing mechanism 4 along the direction of the sound-absorbing mechanism.

[0043] The above-mentioned primary sound-absorbing mechanism 3 can not only realize the noise reduction function, but also adsorb the impurities in the exhaust gas of the motorcycle. In this way, the impurities in the exhaust gas can be effectively prevented from gathering and blocking the sound-absorbing device, thereby affecting the sound-absorbing effect of the motorcycle sound-absorbing device.

[0044] As shown in Figure 4 the filter column 31 is a cylindrical structure with one end open and the other end closed. The filter column 31 is arrayed with through holes 34. After the sound wave and the exhaust gas with impurities enter the filter column 31, the sound wave and the exhaust gas with impurities collide with the bottom of the filter column 31. In this way, the sound wave and the exhaust gas with impurities change direction for the first time, which means that the sound wave and the exhaust gas with impurities are weakened for the first time. At the same time, the filter column 31 is arrayed with through holes 34, and the sound wave and the exhaust gas with impurities enter the absorption felt 32 through the through holes 34 in the filter column 31.

[0045] As shown in Figure 5 the absorption felt 32 is made of glass fiber felt. The glass fiber felt is mainly made of glass wool and has a high sound absorption coefficient. The sound wave will not produce any wave reflection on the surface of the glass fiber felt, which can effectively absorb noise. At the same time, the glass fiber felt also has good moisture resistance and can maintain a certain flatness under certain humidity conditions, which is more stable. In addition, the glass fiber felt also has good fire resistance and can better withstand high temperatures, which can ensure normal work in the high-temperature environment of motorcycle exhaust gas. Finally, the glass fiber felt also has good heat insulation performance, and the use of glass fiber felt can effectively prevent the heat of high-temperature exhaust gas from being transferred to the surface of the sound-absorbing device to scald the nearby workers.

[0046] The absorption felt 32 is fixed in a spiral shape on the filter column 31, so that the sound waves can be in contact with the absorption felt 32 as much as possible, and the interval between the absorption felt 32 is set to 5cm, which can ensure the flow of gas and absorb the sound waves as much as possible; so that the absorption felt 32 has better absorption effect on the sound waves, and also increases the flow of gas;

[0047] The absorption felt 32 selects a 3mm thick glass fiber felt, and the sound insulation effect of the 3mm thick glass fiber felt single piece can reach 43 decibels. Compared with the 2mm thick glass fiber felt, the 3mm thick glass fiber felt has better fireproof and waterproof performance. At the same time, the glass fiber felt has the characteristics of being heavy and dense, commonly known as high density. The most fundamental point of the sound insulation effect is determined by the mass per unit area of the material. Therefore, in an infinite space, the thicker the thickness of the absorption felt 32, the better the sound insulation effect. However, in the motorcycle silencer, due to the small space of the motorcycle silencer, the 3mm thick absorption felt 32 can reduce the weight of the absorption felt 32 while ensuring the sound insulation effect. Therefore, the 3mm thick absorption felt is selected.

[0048] As shown in Figure 6 The secondary silencing mechanism 4 includes a pipe 41 and a silencing bin 42, the silencing bin 42 is fixedly installed on the right side of the silencing shell 33, and the silencing bin 42 is used for further silencing the sound waves processed by the first silencing mechanism 3; one end of the silencing bin 42 is fixedly installed with the pipe 41, and the other end of the pipe 41 is fixedly connected with another silencing bin 42, and the pipe 41 is used for transporting the sound waves to another silencing bin 42.

[0049] When the noise processed by the first silencing mechanism 3 enters the secondary silencing mechanism 4, the noise enters the silencing bin 42, and since the silencing bin 42 is a cylindrical hollow structure, the noise will be reflected multiple times in the silencing bin 42, and then enter the next silencing bin 42 through the pipe 41. After passing through multiple silencing bins 42, the noise will enter the last third silencing mechanism 5 for further processing and then be discharged.

[0050] The above-mentioned secondary silencing mechanism 4 can correspond to the needs of different motorcycles by setting different numbers of sound insulation bins. The noise will gradually weaken after multiple reflections in the silencing bin 42, and after reflection, the noise will enter the next silencing bin 42 through the pipe 41, and then after multiple reflections in the silencing bin 42, the noise can be reduced to below the value A. The above-mentioned secondary silencing mechanism 4 can complete the silencing work without any energy, and only by setting several hollow bin bodies, the effect of absorbing noise is realized. Compared with the silencing equipment in the prior art, the service life of the secondary silencing mechanism 4 is higher and is not easy to be damaged, and is more convenient and fast.

[0051] As Figure 7 shown, the sound-attenuating bin 42 is staggered with the through pipe 41, and the through pipe 41 between every two sound-attenuating bins 42 is symmetrically installed with respect to the diameter of the sound-attenuating bin 42; the advantage of this installation is that it can increase the moving path of the sound wave and the exhaust gas, and the longer the moving path of the noise and the exhaust gas generated by the motorcycle, the better the noise reduction effect; the sound-attenuating bin 42 and the through pipe 41 can be multiple, and the number of sound-attenuating bins 42 and through pipes 41 can be set according to the displacement of the motorcycle; because the larger the displacement of the motorcycle, the greater the noise generated, therefore the number of sound-attenuating bins 42 and through pipes 41 required to be installed is different for different displacement of the motorcycle, which can be selected as needed.

[0052] As Figure 7 shown, the through pipe 41 is fixedly installed with a filter screen 43 inside; during the flow of noise and exhaust gas, part of the impurities will flow with the exhaust gas, therefore the filter screen 43 is fixedly installed inside the through pipe 41, which can filter out the impurities in the exhaust gas and isolate the impurities outside the through pipe 41, so as to further ensure the normal use of the secondary sound-attenuating mechanism 4 and increase the service life of the secondary sound-attenuating mechanism 4.

[0053] As Figure 9 shown, the tertiary sound-attenuating mechanism 5 includes a transition bin 51, an exhaust bin 52, a sound-attenuating plate 53, a pressing plate 54, a spring 55 and a connecting rope 56; the transition bin 51 is fixedly installed on the right side of the secondary sound-attenuating mechanism 4, and is used to transport the sound wave and the exhaust gas processed by the secondary sound-attenuating mechanism 4 into the exhaust bin 52; the exhaust bin 52 is fixedly installed on the right side of the transition bin 51, and is used to discharge the remaining sound wave and exhaust gas into the air; the sound-attenuating plate 53 is hingedly connected inside the exhaust bin 52, and is used to block the transmission of the sound wave, thereby reducing the noise; the pressing plate 54 is symmetrically arrayed outside the exhaust bin 52, and is used to cooperate with the sound-attenuating plate 53 to achieve the noise reduction effect; the spring 55 is fixedly installed between the pressing plate 54 and the exhaust bin 52, and is used to reset the pressing plate 54; the connecting rope 56 is fixedly installed between the pressing plate 54 and the exhaust bin 52, and is used to control the positional relationship between the pressing plate 54 and the sound-attenuating plate 53.

[0054] In the process of motorcycle movement, the faster the motorcycle, the greater the pressure on the pressing plate 54, and the greater the pressing amplitude of the pressing plate 54. When the pressing plate 54 is pressed, the soundproof plate 53 rotates along the hinge shaft under the action of gravity, i.e. the soundproof plate 53 is lowered in the exhaust chamber 52, so that the contact area of the sound waves in the exhaust chamber 52 with the soundproof plate 53 is larger, and the soundproof effect of the three-stage soundproof mechanism 5 is better. When the motorcycle stops moving, the pressing plate 54 does not receive the pressure of the fluid, and under the action of the spring 55, the pressing plate 54 returns to the original position. Since the pressing plate 54 and the soundproof plate 53 are provided with the connecting rope 56, under the action of the connecting rope 56, the soundproof plate 53 also returns to the original position.

[0055] The three-stage soundproof mechanism 5 can automatically adjust the position of the soundproof plate 53 according to the speed. Without any power source, the inclination of the soundproof plate 53 can be changed according to the speed. After the motorcycle stops, the three-stage soundproof mechanism 5 can also return to the original position, so that the automatic adjustment of the three-stage soundproof mechanism 5 is realized.

[0056] As shown in Figures 8 to 9 , the soundproof plate 53 is a damping soundproof plate 53. The main sound insulation of the damping soundproof plate 53 is that the damping material can weaken the bending vibration intensity of the metal plate. When the metal bends and vibrates, the vibration energy is quickly transmitted to the closely vibrating sound insulation material, causing the internal friction and mutual displacement of the damping sound insulation material. Due to the large internal loss and internal friction of the damping material, a part of the vibration energy of the metal plate is converted into heat energy and dissipated, thereby weakening the vibration. The damping soundproof plate 53 also has the advantages of safety, lightness, heat resistance and the like, so the damping soundproof plate 53 can be well applied to the three-stage soundproof mechanism 5.

[0057] Second embodiment

[0058] As shown in Figure 11 , the second embodiment of the motorcycle multi-stage soundproof device. The motorcycle multi-stage soundproof device in this embodiment is similar to the first embodiment Figure 1The structure, installation, locking, cooperation and removal of the motorcycle multi-stage muffler are basically similar, and will not be repeated here. Only the differences relative to the first embodiment are described. The difference is that the first-stage muffling mechanism 3 is fixedly installed with a sliding door 21 between the second-stage muffling mechanism 4 and the third-stage muffling mechanism 5, which is used to control the communication between the first-stage muffling mechanism 3, the second-stage muffling mechanism 4 and the third-stage muffling mechanism 5. The sliding door 21 is provided with sliding rails 22 above, and is used to slide between the sliding rails 22. The sliding door 21 is fixedly installed with a piston rod 23, which is used to drive the sliding door 21 to slide. The piston rod 23 is fixedly installed with a piston 24 at one end, which is used to drive the piston rod 23 to slide. The piston 24 is filled with a thermal expansion and contraction gas between the piston 24 and the sliding rail 22, which drives the piston 24 to move. When the muffler is working, the exhaust gas of the motorcycle is at a high temperature, so under the transmission of the exhaust gas heat, the thermal expansion and contraction gas will expand, and the expanded gas will drive the piston 24 to move upwards, and the upward moving piston 24 will drive the sliding door 21 to slide upwards, at this time the first-stage muffling mechanism 3, the second-stage muffling mechanism 4 and the third-stage muffling mechanism 5 are communicated. When the motorcycle is turned off, no high-temperature exhaust gas will be discharged at this time, so the sliding door 21 will slide downward under the action of gravity, at this time the first-stage muffling mechanism 3, the second-stage muffling mechanism 4 and the third-stage muffling mechanism 5 are closed. The second embodiment can automatically control the communication or closing of each muffling mechanism according to whether the motorcycle is started or not, so as to prevent foreign matter from entering each stage of muffling mechanism from the exhaust port when the motorcycle is turned off, thereby affecting the use of the muffler.

[0059] When the internal combustion engine burns exhaust gas to produce noise, the sound wave and the exhaust gas with impurities will be directly discharged into the filter column 31, and the sound wave and the exhaust gas with impurities will be evenly dispersed into the absorption felt 32 through the filter column 31. Since the absorption felt 32 is arranged in a spiral shape, the sound wave and the exhaust gas with impurities will pass through multiple layers of absorption felt 32. After passing through multiple layers of absorption felt 32, the impurities in the sound wave and the exhaust gas with impurities will be adsorbed by the absorption felt 32, and at the same time, due to the blocking of the sound-absorbing shell 33, the sound wave will change direction and flow to the second-stage muffling mechanism 4 along the direction of the second-stage muffling mechanism 4;

[0060] When the noise treated by the first-stage muffling mechanism 3 enters the second-stage muffling mechanism 4, the noise enters the muffling chamber 42. Since the muffling chamber 42 is a cylindrical hollow structure, the noise will be reflected multiple times in the muffling chamber 42, and then enter the next muffling chamber 42 through the through pipe 41. After passing through multiple muffling chambers 42, the noise will enter the last third-stage muffling mechanism 5 for further treatment and then be discharged.

[0061] In the process of motorcycle movement, the faster the motorcycle, the greater the pressure on the pressing plate 54, so the greater the pressing plate 54 is pressed, and when the pressing plate 54 is pressed, the sound-absorbing plate 53 rotates along the hinge shaft under the action of gravity, that is, the sound-absorbing plate 53 is lowered in the exhaust chamber 52, so the contact area of the sound waves in the exhaust chamber 52 with the sound-absorbing plate 53 is larger, and the sound-absorbing effect of the three-stage sound-absorbing mechanism 5 is better; when the motorcycle stops moving, the pressing plate 54 does not receive the pressure of the fluid, and under the action of the spring 55, the pressing plate 54 will return to the original position, and since the pressing plate 54 and the sound-absorbing plate 53 are provided with the connecting rope 56, under the action of the connecting rope 56, the sound-absorbing plate 53 will also return to the original position; the noise in the second-stage sound-absorbing mechanism 4 is discharged after passing through the sound-absorbing plate 53 in the three-stage sound-absorbing mechanism 5.

[0062] The basic principles, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A multi-stage silencing device for a motorcycle, comprising an air inlet (1), a casing (2), a first stage silencing mechanism (3), a second stage silencing mechanism (4), a third stage silencing mechanism (5) and an air outlet (6), characterized in that, The air inlet (1) is fixedly installed on the motorcycle, and the air inlet (1) is used to transport the gas and noise emitted by the motorcycle to the first silencing mechanism (3); one end of the air inlet (1) is fixedly installed with the first silencing mechanism (3), and the first silencing mechanism (3) is used to preliminarily absorb the noise emitted by the motorcycle and filter the impurities in the motorcycle exhaust; the right side of the first silencing mechanism (3) is fixedly installed with the second silencing mechanism (4); the second silencing mechanism (4) is used to further absorb the noise emitted by the motorcycle; the right side of the second silencing mechanism (4) is fixedly installed with the third silencing mechanism (5), and the third silencing mechanism (5) is used to automatically adjust the silencing mode according to the speed of the motorcycle; the right side of the third silencing mechanism (5) is fixedly installed with the air outlet (6), and the air outlet (6) is used to discharge the motorcycle exhaust; The first silencing mechanism (3) comprises a filter column (31), an absorption felt (32) and a silencing shell (33), one end of the air inlet (1) is fixedly installed with the filter column (31), and the filter column (31) is fixedly installed with the absorption felt (32) on the same axis; the absorption felt (32) is sleeved with the silencing shell (33), and the silencing shell (33) is fixedly installed on the shell (2); The second silencing mechanism (4) comprises a through pipe (41) and a silencing bin (42), the silencing bin (42) is fixedly installed on the right side of the silencing shell (33), one end of the through pipe (41) is fixedly installed on the silencing bin (42), and the other end of the through pipe (41) is fixedly connected with another silencing bin (42); The third silencing mechanism (5) comprises a transition bin (51), an exhaust bin (52), a silencing plate (53), a pressing plate (54), a spring (55) and a connecting rope (56), the transition bin (51) is fixedly installed on the right side of the second silencing mechanism (4); the exhaust bin (52) is fixedly installed on the right side of the transition bin (51), the silencing plate (53) is hingedly connected in the exhaust bin (52), the pressing plate (54) is symmetrically arranged outside the exhaust bin (52), the spring (55) is fixedly installed between the pressing plate (54) and the exhaust bin (52), and the connecting rope (56) is fixedly installed between the pressing plate (54) and the exhaust bin (52); The silencing plate (53) is a damping silencing plate (53); The third silencing mechanism (5) changes the inclination degree of the silencing plate (53) according to the speed without any power source; and the third silencing mechanism (5) returns to the original position after the motorcycle stops.

2. A multi-stage motorcycle silencer according to claim 1, characterized in that: The filter column (31) is a cylindrical structure with one end open and the other end closed, and a plurality of through holes (34) are arranged on the filter column (31).

3. A multi-stage motorcycle silencer according to claim 1, characterized in that: The absorption felt (32) is spirally wound on the filter column (31); the interval distance between the absorption felts (32) is 5cm; and the absorption felt (32) is made of glass fiber felt.

4. A multi-stage motorcycle silencer as defined in claim 1, characterized in that: The sound attenuation bin (42) is staggered with the through pipe (41), and the through pipe (41) between every two sound attenuation bins (42) is symmetrically arranged about the diameter of the sound attenuation bin (42) compared with the previous through pipe (41) installation position; the sound attenuation bin (42) and the through pipe (41) are multiple.

5. A multi-stage motorcycle silencer as defined in claim 1, characterized in that: The through pipe (41) is fixedly provided with a filter screen (43) inside.

6. A multi-stage motorcycle silencer as defined in claim 1, characterized in that: The first-order sound attenuation mechanism (3) is fixedly provided with a sliding door (21) between the second-order sound attenuation mechanism (4) and the third-order sound attenuation mechanism (5), and a sliding rail (22) is arranged above the sliding door (21); a piston rod (23) is fixedly arranged on the sliding door (21), and a piston (24) is fixedly arranged at the end of the piston rod (23); and a heat expansion and cold contraction gas is filled between the piston (24) and the sliding rail (22).

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