A 900cc displacement three-cylinder three-stage impedance type special-shaped muffler

Abstract

The present invention relates to the technical field of muffler, specifically to a 900CC displacement three-cylinder three-stage impedance-type special-shaped muffler, comprising a shell, an air intake cover, a right baffle, a left baffle, a first pipe, an air outlet cover, a second pipe and a switching module, wherein the air intake cover is installed on the right side of the shell, the right baffle and the left baffle are installed inside the shell from right to left in sequence, and the right baffle and the left baffle divide the inner cavity of the shell into an anti-section, a functional section and a resistance section to the right in sequence, the first pipe passes through the right baffle and the left baffle, the air outlet cover is installed at the left end of the shell, the second pipe passes through the left baffle and the air outlet cover, and the switching module is installed inside the functional section; the present invention divides the inner cavity of the muffler into three sections, one section plays a resistive role, one section plays a resistive role, and the other section changes the impedance role according to the driving state of the motorcycle, thereby achieving the purpose of reducing the resistance while enhancing the resistance, so as to enhance the high-frequency noise elimination effect while ensuring the performance of the motorcycle.

Description

Technical Field

[0001] The present invention relates to the technical field of mufflers, in particular to a 900cc displacement three-cylinder three-section impedance type special-shaped muffler. Background Art

[0002] 900cc three-cylinder engines are commonly used in motorcycles. Based on the emission values, motorcycles are often categorized as ultralight, light, small-to-medium, and large-displacement. The 900cc engine falls into the large-displacement category. The engine produces exhaust gas and vibration during operation. If these exhaust gases are discharged directly from the engine, the vibrating gas molecules will generate noise. Furthermore, the operating principle of a three-cylinder engine is different from that of a four-cylinder engine. Due to its fewer cylinders, it produces greater vibration and, accordingly, greater noise. Therefore, a muffler is usually connected to the exhaust port of the engine.

[0003] The engine's power frequency varies with the speed of the motorcycle, and accordingly, the vibration frequency of the exhaust gas generated by the engine will also vary. Therefore, the noise emitted by the engine is divided into high-frequency and low-frequency. Usually, high-frequency noise is eliminated by resistive means (such as absorption by porous structures), and low-frequency noise is eliminated by resistant means (such as sudden changes in the cross-section of the exhaust gas flow pipe). When a motorcycle is traveling at low speeds, it often passes by a crowd. To avoid affecting the crowd, more resistant structures are arranged inside the muffler. However, when the motorcycle is traveling at high speeds, the resistant structure will hinder the outflow of exhaust gas (just like a person wearing a mask when exercising), which will lead to poor engine exhaust and reduced performance. To avoid this phenomenon, the existing technology will arrange a passive valve or an active valve inside the muffler. When the motorcycle is traveling at low speeds, the valve opening is reduced to enhance the resistance of the muffler, thereby better eliminating low-frequency noise. When the motorcycle is traveling at high speeds, the valve opening is increased to reduce the resistance of the muffler, thereby allowing the exhaust gas to be discharged more smoothly from the muffler, thereby avoiding reduced engine performance.

[0004] The existing technology sets a passive valve or an active valve inside the muffler, which not only optimizes the low-frequency noise elimination effect, but also avoids the reduction of engine performance. However, in order to ensure that the motorcycle has an excellent noise reduction effect when running at high speed and low speed, a structure with both resistance and resistance (such as a micro-perforated plate) is set inside the muffler to achieve dual elimination of high-frequency noise and low-frequency noise. Therefore, when the motorcycle reduces the resistance of the muffler to run at high speed, the resistance of the muffler will also be weakened, thereby weakening the elimination effect of high-frequency noise. In addition, when the motorcycle is running at low speed, the fuel combustion is not complete, and the exhaust gas will be mixed with oil and gas, which will quickly pollute the porous absorption structure that plays a resistive role.

[0005] Therefore, a 900CC three-cylinder three-stage impedance special-shaped muffler is proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a 900CC displacement three-cylinder three-stage impedance type special-shaped muffler, which solves the problem that the resistance of the muffler decreases together with the reactance when the motorcycle is running at high speed, and the resistive section is quickly contaminated when running at low speed. By dividing the inner cavity of the muffler into three sections, one section plays a resistive role, one section plays a resistive role, and the other section changes the impedance role according to the running state of the motorcycle, the resistivity is reduced and the resistance is enhanced at the same time, so as to enhance the high-frequency noise elimination effect while ensuring the performance of the motorcycle, and avoid the contact between the exhaust gas and the filler when running at low speed, thereby extending the service life of the resistive section.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A 900cc displacement three-cylinder three-stage impedance-type special-shaped muffler, comprising a shell, an air intake cover, a right baffle, a left baffle, a first pipe, an air outlet cover, a second pipe, and a switching module. The air intake cover is mounted on the right side of the shell, the right baffle and the left baffle are sequentially mounted inside the shell from right to left, and the right baffle and the left baffle divide the inner cavity of the shell into an impedance section, a functional section, and an impedance section to the right, respectively. The first pipe passes through the right baffle and the left baffle, and the left and right ports of the first pipe are respectively located inside the impedance section and the impedance section. The air outlet cover is mounted on the left end of the shell, the second pipe passes through the left baffle and the air outlet cover, and the left and right ports of the second pipe are respectively located outside the muffler and inside the functional section. The switching module is mounted inside the functional section.

[0009] The first special-shaped pipe with both ends extending into the resistance section and the anti-resistance section respectively will further reduce the noise of the gas that has eliminated low-frequency noise through the anti-resistance section. The second pipe will discharge the gas that has eliminated high-frequency noise through the resistance section to the outside. The second pipe is pushed and pulled by the switching module and extends and shortens respectively when the functional section is under high pressure and low pressure, so as to respectively improve its own resistance and anti-resistance.

[0010] Preferably, the right side of the right partition is configured as an inner conical structure, and the right end of the first pipe is installed at the center of the conical structure of the right partition;

[0011] In the above scheme, the setting of the inner conical surface on the right side of the right partition increases the contact area with the exhaust gas discharged from the air intake cover to enhance the reflection of the exhaust gas, thereby improving the resistance of the anti-section, and the setting of the inner conical surface makes the reflected exhaust gas deviate from the horizontal direction of propagation and collide at the center of the anti-section, so that the energy of the exhaust gas offsets each other to further eliminate low-frequency noise; in addition, the setting of the conical surface also makes the horizontal pressure of the exhaust gas on the right partition produce vertical separation, thereby reducing the horizontal pressure of the exhaust gas on the right partition, so that the muffler structure is more stable.

[0012] Preferably, the air intake cover includes a cover body, an air intake pipe, a blocking block and a support, the cover body is connected to the right end of the housing, the air intake pipe passes through the cover body, and the air intake pipe is coaxial with the right end of the first pipe, the left end of the air intake pipe is configured as a tapered structure with the larger diameter on the left, the blocking block is located inside the tapered structure of the air intake pipe, and the support is connected between the blocking block and the tapered structure of the air intake pipe;

[0013] In the above scheme, the intake pipe is combined with the block to cause the cross-section of the exhaust gas flowing through the intake pipe to undergo multiple mutations, so as to improve the resistance of the anti-segment and thus better eliminate low-frequency noise; and the further cooperation of the conical structure of the intake pipe and the block can also guide the exhaust gas discharged from the intake pipe to the inner conical surface of the right partition, and avoid the exhaust gas directly entering the first pipe, thereby further enhancing the resistance of the anti-segment.

[0014] Preferably, the right end of the block is configured as a conical structure, and the support is configured as a triangular prism structure with one edge facing right;

[0015] In the above scheme, the conical surface of the block and the triangular prism structure of the support reduce the resistance of the exhaust gas discharged by the engine into the muffler, which not only makes the engine exhaust smooth, thereby ensuring the performance of the motorcycle, but also makes the connection between the block and the support more stable, making the muffler work more reliable.

[0016] Preferably, the left end of the first pipe is installed on the left partition, and the installation position of the left end of the first pipe deviates from the center of the left partition, and the right side of the air outlet cover is connected to an air dispersion block, and the air dispersion block is coaxial with the left end of the first pipe;

[0017] In the above scheme, the two ends of the first pipe are respectively installed on the left partition and the right partition, and the two ends are at different heights, so that the first pipe is shaped to have the following characteristics: 1) Longer length, thereby increasing the loss along the way when the exhaust gas flows through, so as to achieve a resistive effect and eliminate high-frequency noise; 2) Multiple turning points, so that the exhaust gas flows through the turning points during the flow, so as to achieve a resistive effect and eliminate low-frequency noise; the wind dispersion block coaxially arranged with the left end of the first pipe diffuses the exhaust gas discharged from the first pipe evenly inside the resistance section through its own reflection, and disperses the horizontal impact of the gas on the outlet cover in the vertical direction, so that the connection of the outlet cover to the shell is more stable and the muffler works more reliably.

[0018] Preferably, the left partition includes a plate body and a perforated plate, the plate body is connected to the inside of the shell, the perforated plate is installed on the left side of the plate body, there are multiple perforated plates, and the positions of the holes on the multiple perforated plates are different;

[0019] In the above scheme, a plurality of orifice plates with different opening positions are combined into a porous structure, which constitutes the basic part of the muffler's resistive effect to achieve the elimination of high-frequency noise. The advantages are: 1) The positions of the holes on each orifice plate are different, so there is no need to limit the flow of exhaust gas by the aperture of the holes on the orifice plate, thereby avoiding the orifice plate from being blocked by exhaust gas containing oil and gas; 2) The structure of the orifice plate is simple and easy to combine. By controlling the number of combinations, the absorption capacity of the resistance section to high-frequency noise can be adjusted to ensure the performance of the motorcycle while eliminating noise.

[0020] Preferably, a drainage hole is opened on the plate body, and the drainage hole is located below the left end of the first pipe, and the drainage hole is set to a tapered hole structure with the larger diameter on the left;

[0021] In the above scheme, the drainage hole guides the exhaust gas that has been resistively treated in the resistance section into the functional section, and through the conical setting, accelerates the circulation of the exhaust gas and enhances the reflection of the exhaust gas in this process; the drainage hole is set below the left end of the first pipe in order to raise the left end of the first pipe, so as to further enhance the effect brought by the special-shaped structure of the first pipe, thereby better eliminating low-frequency and high-frequency noise.

[0022] Preferably, the second pipe includes an outer pipe and an inner pipe, the left end and the right end of the outer pipe are respectively mounted on the air outlet cover and the left baffle, the inner pipe is slidably connected to the inside of the outer pipe, the left end of the outer pipe is configured as a tapered structure with a smaller diameter on the left, and a mesh ring is connected to the inner side of the outer pipe, the mesh ring and the outer pipe are filled with glass fiber, the inner ring of the inner pipe is configured as a tapered structure with a larger diameter on the left, and a vent is opened at the right end of the inner pipe;

[0023] In the above scheme, the exhaust gas entering the anti-section is discharged to the outside after resistance treatment and resistive treatment through the cooperation of the second pipe, the first pipe and the drainage hole. The arrangement of the three extends the path of the exhaust gas flow to enhance the resistive effect, and each time the exhaust gas enters and discharges the three, a sudden change in cross-section will occur, thereby enhancing the effect of resistance, thereby effectively reducing the noise of a large-displacement motorcycle using a 900CC three-cylinder engine; in addition, through the setting of the interior of the second pipe, the outer pipe and the inner pipe cooperate to make it show strong resistance when the pressure inside the muffler is high (that is, the motorcycle is running at high speed), and show strong resistance when the pressure inside the muffler is low (that is, the motorcycle is running at low speed).

[0024] Preferably, the switching module includes a cylinder, a push rod and a spring, the cylinder is connected to the left end of the right partition, the push rod is slidably connected inside the cylinder, and the left end of the push rod is connected to the right end of the inner tube, and the spring is installed between the push rod and the right partition;

[0025] In the above scheme, the switching module serves as the power source of the inner pipe, controlling the second pipe to switch between strong resistance and strong resistance. The switching module composed of a rod body, a push rod, and a spring serves as a passive device, which is controlled by the pressure in the functional section. Compared with the active device, in addition to realizing power transmission, it can also further consume the energy of the exhaust gas through the energy storage during spring compression, thereby playing a role in reducing noise.

[0026] Preferably, a retreat hole is opened on the right side of the right partition, and a connecting hole is opened below the retreat hole, one end of the connecting hole passes through the retreat hole, and the other end of the connecting hole leads to the outside;

[0027] In the above scheme, by opening the connecting hole, the retreat hole and the inner cavity of the cylinder on the right side of the push rod are connected to the outside world, so that the air pressure in the retreat hole and the inner cavity of the cylinder on the right side of the push rod is constant, so that the effect of the air pressure in the functional section on the push rod is consistent, so that the second pipe can show a resistance that matches the speed of the motorcycle (the higher the speed, the higher the pressure inside the muffler).

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The present invention adopts a three-section design for the muffler. The two ends of the muffler play the role of resistance and resistance respectively. The middle section of the muffler exhibits strong resistance when the motorcycle is running at low speed to eliminate low-frequency noise. At this time, the resistive layer in the muffler is shielded from contact with the exhaust gas containing oil and gas, thereby preventing the resistive layer from being quickly contaminated. The middle section of the muffler exhibits strong resistance when the motorcycle is running at high speed to eliminate high-frequency noise while allowing the exhaust gas to be discharged smoothly, thereby ensuring the performance of the motorcycle at high speed.

[0030] 2. The present invention performs a special-shaped design for the first pipe. Through the height difference between the two ends of the first pipe, the flow path of the exhaust gas in the first pipe is extended, thereby increasing the along-the-line loss of the exhaust gas flow to achieve a resistive effect and reduce the high-frequency noise of the exhaust gas. The flow path of the exhaust gas in the first pipe is made to have multiple bends, and then the exhaust gas is reflected multiple times during the flow process, thereby achieving a resistive effect and reducing the low-frequency noise of the exhaust gas. Through the cooperation of the first pipe with the drainage hole and the second pipe, the exhaust gas in the resistance section is first led to the resistance section, and then the exhaust gas in the resistance section is led to the functional section, and finally the exhaust gas in the functional section is led to the outside world, thereby further increasing the length of the exhaust gas flow path, and enhancing the resistive effect of the muffler. Each time the exhaust gas enters and is discharged from the first pipe, the drainage hole or the second pipe, it is accompanied by a sudden change in the flow cross-section, thereby enhancing the resistive effect of the muffler.

[0031] 3. The present invention slidingly connects the inner tube to the outer tube. When the internal pressure of the muffler is high or low (i.e., when the motorcycle is running at high or low speed), the push rod drives the inner tube to slide rightward or leftward, respectively, to achieve strong resistance and strong counteraction of the second tube, thereby achieving dual elimination of high-frequency noise and low-frequency noise. The power for the push rod to move rightward comes from the internal pressure of the functional section, and the power for the push rod to move leftward comes from the potential energy of the spring. Furthermore, the compressed energy storage of the spring can also absorb part of the energy of the exhaust gas, thereby eliminating noise of a certain intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a front right isometric structural schematic diagram of the present invention;

[0033] Figure 2 This is a schematic diagram of the front right inner section isometric structure of the present invention;

[0034] Figure 3 This is a schematic diagram of the front left inner section isometric structure of the present invention;

[0035] Figure 4 For the present invention Figure 3 A magnified schematic diagram of part A;

[0036] Figure 5 It is a schematic diagram of the orifice plate assembly of the present invention;

[0037] Figure 6 This is a schematic diagram of the muffler state of a motorcycle running at low speed according to the present invention;

[0038] Figure 7 This is a schematic diagram of the muffler state of a motorcycle of the present invention when running at high speed;

[0039] Figure 8 It is an assembly diagram of the present invention.

[0040] In the figure: 1. Shell; 11. Resistance section; 12. Functional section; 13. Resistance section; 2. Inlet cover; 21. Cover body; 22. Inlet pipe; 23. Block; 24. Pillar; 3. Right partition; 31. Retreat hole; 32. Connecting hole; 4. Left partition; 41. Plate body; 411. Drainage hole; 42. Orifice plate; 5. First pipe; 6. Air outlet cover; 61. Air dispersion block; 7. Second pipe; 71. Outer pipe; 711. Mesh ring; 712. Glass fiber; 72. Inner pipe; 721. Vent; 8. Switching module; 81. Cylinder body; 82. Push rod; 83. Spring. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] See also Figures 1 to 8 The present invention provides a 900CC displacement three-cylinder three-stage impedance type special-shaped muffler, the technical solution is as follows:

[0043] A 900cc displacement three-cylinder three-stage impedance type special-shaped muffler, comprising a shell 1, an air intake cover 2, a right baffle 3, a left baffle 4, a first pipe 5, an air outlet cover 6, a second pipe 7 and a switching module 8, wherein the air intake cover 2 is mounted on the right side of the shell 1, the right baffle 3 and the left baffle 4 are sequentially mounted inside the shell 1 from right to left, and the right baffle 3 and the left baffle 4 divide the inner cavity of the shell 1 into an impedance section 11, a functional section 12 and an impedance section 13 to the right, respectively; the first pipe 5 passes through the right baffle 3 and the left baffle 4, and the left port and the right port of the first pipe 5 are respectively inside the impedance section 13 and the impedance section 11; the air outlet cover 6 is mounted on the left end of the shell 1, the second pipe 7 passes through the left baffle 4 and the air outlet cover 6, and the left port and the right port of the second pipe 7 are respectively outside the muffler and inside the functional section 12; the switching module 8 is mounted inside the functional section 12;

[0044] The special-shaped first pipe 5, whose two ends extend into the resistance section 13 and the anti-noise section 11 respectively, further reduces the noise of the gas that has eliminated low-frequency noise through the anti-noise section 11. The second pipe 7 discharges the gas that has eliminated high-frequency noise through the resistance section 13 to the outside. The second pipe 7 is pushed and pulled by the switching module 8 and extends and shortens respectively when the functional section 12 is under high pressure and low pressure, so as to respectively improve its own resistance and anti-noise.

[0045] As an embodiment of the present invention, refer to Figure 1 and Figure 2 The right side of the right partition plate 3 is set as an inner cone structure, and the right end of the first pipe 5 is installed at the center position of the cone structure of the right partition plate 3; the right partition plate 3 is welded with steel plates to achieve the overall lightweight of the muffler, and the first pipe 5 and the right partition plate 3 are connected by welding; the angle of the cone surface of the right partition plate 3 is determined according to the space of the anti-section 11. The larger the value, the closer the position where the exhaust gas collides with each other after being reflected is to the right partition plate 3, so that the energy of the exhaust gas to offset each other is greater, and accordingly, the effect of removing low-frequency noise is also better.

[0046] As an embodiment of the present invention, refer to Figure 3 and Figure 4The air intake cover 2 includes a cover body 21, an air intake pipe 22, a block 23 and a support 24. The cover body 21 is connected to the right end of the housing 1. The air intake pipe 22 passes through the cover body 21 and is coaxial with the right end of the first pipe 5. The left end of the air intake pipe 22 is configured as a tapered structure with the larger diameter on the left. The block 23 is located inside the tapered structure of the air intake pipe 22. The support 24 is connected between the block 23 and the tapered structure of the air intake pipe 22. The right end of the block 23 is configured as a conical surface structure, and the support 24 is configured as a triangular prism structure with one edge facing right.

[0047] The steps for connecting the components of the air intake cover 2 are as follows: first, weld multiple pillars 24 one by one between the block 23 and the conical structure of the air intake pipe 22, paying attention to the equal spacing of the pillars 24, and then weld the air intake pipe 22 to the cover body 21, and finally weld the cover body 21 to the shell 1; in this method, the right side of the conical structure of the air intake pipe 22 is set as a cylindrical tube. When working, the exhaust gas discharged from the engine first passes through the cylindrical tube. At this time, the exhaust gas has a larger flow cross-section. When the exhaust gas encounters the block 23, the flow cross-section suddenly becomes smaller, and as the exhaust gas continues to flow along the air intake pipe 22, its flow cross-section continues to increase; through the multiple changes in the above-mentioned flow cross-section, the anti-section 11 is more effective in removing low-frequency noise.

[0048] As an embodiment of the present invention, refer to Figure 2 The left end of the first pipe 5 is installed on the left partition 4, and the installation position of the left end of the first pipe 5 deviates from the center of the left partition 4. The right side of the air outlet cover 6 is connected to the wind dispersion block 61, and the wind dispersion block 61 is coaxial with the left end of the first pipe 5; the left end of the first pipe 5 is welded to the left partition 4. The greater the height difference between the two ends of the first pipe 5, the longer the length of the first pipe 5 and the greater the bending amplitude under the premise that the volume of the functional section 12 remains unchanged, and accordingly, the resistive and resistant effects of the first pipe 5 are also stronger.

[0049] As an embodiment of the present invention, refer to Figure 3 and Figure 5 The left partition plate 4 includes a plate body 41 and a orifice plate 42. The plate body 41 is connected to the inside of the shell 1, and the orifice plate 42 is installed on the left side of the plate body 41. There are multiple orifice plates 42, and the positions of the holes on the multiple orifice plates 42 are different; the more the orifice plates 42 are arranged, the smaller the gap formed by the overlapping of each orifice plate 42, so that the orifice plate 42 has a better effect in removing high-frequency noise, and the aperture of the hole on the orifice plate 42 can also be set larger, so that on the one hand, the number of openings of a single orifice plate 42 is reduced to reduce the manufacturing cost, and on the other hand, when the exhaust gas containing oil and gas passes through, the oil molecules will not clog the holes on the orifice plate 42.

[0050] As an embodiment of the present invention, refer to Figure 6 and Figure 8, a drainage hole 411 is opened on the plate body 41, the drainage hole 411 is located below the left end of the first pipe 5, and the drainage hole 411 is set to a tapered hole structure with the larger diameter on the left;

[0051] When assembling the muffler, first weld the left baffle 4-right baffle 3-first pipe 5 into one piece, and before welding, first complete the assembly of the spring 83 and the push rod 82 inside the cylinder 81, and then place the welded body of the left baffle 4-right baffle 3-first pipe 5 into the shell 1, and then weld the shell 1 to the left baffle 4 and the right baffle 3 from both ends of the shell 1, and then weld the intake pipe 22 with completed internal welding (the block 23 and the support 24 have been welded) to the plate body 41, and weld the plate body 41 to the shell 1, and thread the second pipe 7 to the left baffle 4, and bolt the air outlet cover 6 to the shell 1, thereby realizing the detachable function of the second pipe 7 to facilitate the replacement of the glass fiber 712 inside the second pipe 7; the exhaust flow path inside the assembled muffler refers to Figure 6 After the exhaust gas enters the resistance section 11 from the air inlet pipe 22, it enters the resistance section 13 along the second pipe 7. The exhaust gas in the resistance section 13 is subjected to high-frequency noise reduction by the orifice plate 42 and is discharged from the drainage hole 411 to the functional section 12. Then the exhaust gas enters the interior of the inner tube 72 from the vent hole 721 and is discharged to the outside.

[0052] As an embodiment of the present invention, refer to Figure 6 and Figure 7 The second pipe 7 includes an outer pipe 71 and an inner pipe 72. The left and right ends of the outer pipe 71 are respectively mounted on the air outlet cover 6 and the left partition 4. The inner pipe 72 is slidably connected to the inside of the outer pipe 71. The left end of the outer pipe 71 is set as a tapered structure with a small diameter on the left, and a mesh ring 711 is connected to the inside of the outer pipe 71. Glass fiber 712 is filled between the mesh ring 711 and the outer pipe 71. The inner ring of the inner pipe 72 is set as a tapered structure with a large diameter on the left, and a vent hole 72 is opened at the right end of the inner pipe 72. 1; The switching module 8 includes a cylinder 81, a push rod 82, and a spring 83. The cylinder 81 is connected to the left end of the right partition 3. The push rod 82 is slidably connected to the inside of the cylinder 81, and the left end of the push rod 82 is connected to the right end of the inner tube 72. The spring 83 is installed between the push rod 82 and the right partition 3. A retreat hole 31 is opened on the right side of the right partition 3, and a connecting hole 32 is opened below the retreat hole 31. One end of the connecting hole 32 passes through the retreat hole 31, and the other end of the connecting hole 32 leads to the outside.

[0053] The right end of the inner tube 72 is welded to the push rod 82; when the motorcycle is running at a low speed, the pressure of the exhaust gas inside the muffler is low and the spring 83 cannot be compressed, thereby making the left end of the inner tube 72 close to the left end of the outer tube 71. At this time, with the help of the tapered structure of the inner ring of the inner tube 72 and the tapered structure of the left end of the outer tube 71, a sudden change in the exhaust gas flow cross-section is achieved, so that the second pipe 7 exhibits high resistance. When running at a low speed, the fuel is not fully burned, and there will be a high content of oil and gas molecules in the exhaust gas. The shielding of the glass fiber 712 by the inner tube 72 can avoid the pollution of the glass fiber 712 by oil and gas molecules. When the motorcycle is running at a high speed, the muffler The pressure of the exhaust gas inside the sounder increases to compress the spring 83, causing the left end of the inner tube 72 to move toward the right end of the outer tube 71, thereby exposing the glass fiber 712. The high-frequency noise generated when the motorcycle is running at high speed is further removed with the help of the resistance of the glass fiber 712. In this process, the tapered structure of the inner circle of the inner tube 72 is separated from the tapered structure of the left end of the outer tube 71, so that the exhaust gas can be buffered to a certain extent when passing through the mesh ring 711, and will not cause a sudden change in cross-section when the motorcycle is running at low speed, thereby reducing the resistance of the second pipe 7, so that the exhaust gas is discharged more smoothly and the performance of the motorcycle is more stable.

[0054] Working Principle: The present invention adopts a three-stage design for the muffler. The left partition plate 4 and the right partition plate 3 are used to divide the inner cavity of the shell 1 into three sections. From right to left, they are the anti-section 11, the functional section 12 and the resistance section 13. The exhaust gas discharged from the engine into the muffler is eliminated by the resistance of the anti-section 11, and the high-frequency noise is eliminated by the resistance of the resistance section 13. The functional section 12 can adjust its own resistance and resistance according to the working state of the engine. Therefore, when the engine is working at a high frequency (i.e., the motorcycle is running at high speed), it exhibits strong resistance to further eliminate high-frequency noise. When the engine is working at a low frequency (i.e., the motorcycle is running at low speed), it exhibits strong resistance to further eliminate low-frequency noise.

[0055] Specifically, in order to enhance the effect of the anti-section 11 in removing low-frequency noise, the right side of the right partition plate 3 is set to an inner conical structure, and the left end of the intake pipe 22 is set to a conical structure with the larger diameter on the left, and the block 23 is installed inside the conical structure of the intake pipe 22. The setting of the inner conical surface on the right side of the right partition plate 3 not only increases the contact area between the right side of the right partition plate 3 and the exhaust gas discharged from the intake cover 2 to enhance the reflection of the exhaust gas, but also makes the reflected exhaust gas deviate from the horizontal direction of propagation and collide at the center of the anti-section 11, so that the energy of the exhaust gas cancels each other out. The intake pipe 22 cooperates with the block 23, so that the cross-section of the exhaust gas flowing through the intake pipe 22 undergoes multiple mutations, so as to enhance the resistance of the anti-section 11, thereby better eliminating low-frequency noise.

[0056] In order to allow the exhaust gas generated by the engine to be discharged into the muffler more smoothly, thereby making the performance of the motorcycle more stable, the right end of the block 23 is set to a conical structure, and the support 24 is set to a triangular prism structure with one edge facing right, thereby reducing the resistance of the exhaust gas passing through the intake pipe 22;

[0057] In order to more effectively remove low-frequency and high-frequency noises during the transfer of exhaust gas between the resistance section 11, the functional section 12 and the resistance section 13, the right end of the first pipe 5 is installed at the center of the conical structure of the right baffle 3, and the left end of the first pipe 5 is installed on the left baffle 4, and the installation position of the left end of the first pipe 5 deviates from the center of the left baffle 4, so that the heights of the two ends of the first pipe 5 are different. On the one hand, the length of the first pipe 5 is made longer, thereby increasing the loss along the exhaust gas flow, so as to achieve a resistive effect and eliminate high-frequency noise; on the other hand, the first pipe 5 has multiple turning points, so that the exhaust gas is reflected at the turning points during the flow, so as to achieve a resistive effect and eliminate low-frequency noise.

[0058] In order to enable the resistance section 13 to remove high-frequency noise, a plurality of orifice plates 42 are installed on the left side of the plate body 41. The positions of the holes on the plurality of orifice plates 42 are different. By means of the gaps formed by the overlapping of different orifice plates 42, a quasi-porous structure is generated, thereby absorbing the exhaust gas energy to remove high-frequency noise. At the same time, the apertures on the orifice plates 42 can be set larger to prevent the holes from being blocked by the high content of oil and gas molecules in the exhaust gas when the motorcycle is running at low speed.

[0059] In order to make the second pipe 7 exhibit both strong resistance and strong reactive states, the inner pipe 72 is slidably connected to the inner portion of the outer pipe 71, and the mesh ring 711 is filled with glass fiber 712. When the inner pipe 72 moves clockwise, the glass fiber 712 is exposed and contacts the exhaust gas, thereby absorbing high-frequency noise. When the inner pipe 72 moves clockwise, the glass fiber 712 is shielded and does not contact the exhaust gas, thereby avoiding absorption of oil and gas and preventing self-clogging.

[0060] In order to provide power for switching the state of the second pipeline 7, the left end of the push rod 82 is connected to the right end of the inner tube 72, and a connecting hole 32 connected to the outside is opened inside the retreat hole 31. Then, when the pressure inside the functional section 12 is high, the push rod 82 moves to the right under the action of air pressure, and when the pressure inside the functional section 12 is low, the spring 83 drives the push rod 82 to move to the left and return to its original position.

[0061] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A 900cc displacement three-cylinder three-stage impedance type special-shaped muffler, comprising a shell (1), characterized in that: It also includes an air intake cover (2), a right partition (3), a left partition (4), a first pipe (5), an air outlet cover (6), a second pipe (7) and a switching module (8), wherein the air intake cover (2) is mounted on the right side of the shell (1), the right partition (3) and the left partition (4) are sequentially mounted inside the shell (1) from right to left, and the right partition (3) and the left partition (4) divide the inner cavity of the shell (1) into a resistance section (11), a functional section (12) and a resistance section (13) from right to left, the first pipe (5) passes through the right partition (3) and the left partition (4), the air outlet cover (6) is mounted at the left end of the shell (1), the second pipe (7) passes through the left partition (4) and the air outlet cover (6), and the switching module (8) is mounted inside the functional section (12); The first shaped pipe (5) with two ends extending into the resistance section (13) and the anti-section (11) respectively further reduces the noise of the gas that has eliminated low-frequency noise through the anti-section (11), and the second pipe (7) discharges the gas that has eliminated high-frequency noise through the resistance section (13) to the outside, and the second pipe (7) is extended and shortened respectively when the functional section (12) is at high pressure and low pressure due to the push and pull action of the switching module (8); The second pipe (7) comprises an outer pipe (71) and an inner pipe (72), the left end and the right end of the outer pipe (71) are respectively mounted on the air outlet cover (6) and the left partition (4), the inner pipe (72) is slidably connected to the inside of the outer pipe (71), the left end of the outer pipe (71) is configured as a tapered structure with a smaller diameter on the left, and a mesh ring (711) is connected to the inner side of the outer pipe (71), and glass fiber (712) is filled between the mesh ring (711) and the outer pipe (71), the inner ring of the inner pipe (72) is configured as a tapered structure with a larger diameter on the left, and a vent hole (721) is provided at the right end of the inner pipe (72); The switching module (8) includes a cylinder (81), a push rod (82) and a spring (83), wherein the cylinder (81) is connected to the left end of the right partition (3), the push rod (82) is slidably connected inside the cylinder (81), and the left end of the push rod (82) is connected to the right end of the inner tube (72), and the spring (83) is installed between the push rod (82) and the right partition (3).

2. A 900cc displacement three-cylinder three-stage impedance type special-shaped muffler according to claim 1, characterized in that: The right side of the right partition plate (3) is provided with an inner conical surface structure, and the right end of the first pipe (5) is installed at the center position of the conical surface structure of the right partition plate (3).

3. The 900cc displacement three-cylinder three-stage impedance type special-shaped muffler according to claim 2, characterized in that: The air intake cover (2) comprises a cover body (21), an air intake pipe (22), a block (23) and a support (24); the cover body (21) is connected to the right end of the housing (1); the air intake pipe (22) passes through the cover body (21), and the air intake pipe (22) is coaxial with the right end of the first pipe (5); the left end of the air intake pipe (22) is configured as a conical structure with a larger diameter on the left; the block (23) is located inside the conical structure of the air intake pipe (22); and the support (24) is connected between the block (23) and the conical structure of the air intake pipe (22).

4. A 900cc displacement three-cylinder three-stage impedance type special-shaped muffler according to claim 3, characterized in that: The right end of the blocking block (23) is configured as a conical structure, and the support column (24) is configured as a triangular prism structure with one edge facing right.

5. The 900cc displacement three-cylinder three-stage impedance type special-shaped muffler according to claim 1, characterized in that: The left end of the first pipe (5) is mounted on the left partition (4), and the mounting position of the left end of the first pipe (5) deviates from the center of the left partition (4). The right side of the air outlet cover (6) is connected to an air dispersion block (61), and the air dispersion block (61) is coaxial with the left end of the first pipe (5).

6. The 900cc displacement three-cylinder three-stage impedance type special-shaped muffler according to claim 1, characterized in that: The left partition (4) comprises a plate body (41) and a perforated plate (42), wherein the plate body (41) is connected to the interior of the shell (1), and the perforated plate (42) is installed on the left side of the plate body (41). There are multiple perforated plates (42), and the positions of the holes on the multiple perforated plates (42) are different.

7. The 900cc three-cylinder three-stage impedance-type special-shaped muffler according to claim 6, characterized in that: A drainage hole (411) is provided on the plate body (41), and the drainage hole (411) is located below the left end of the first pipe (5). The drainage hole (411) is configured as a tapered hole structure with the larger diameter on the left.

8. The 900cc three-cylinder three-stage impedance-type special-shaped muffler according to claim 1, characterized in that: A retreat hole (31) is provided on the right side of the right partition (3), and a communication hole (32) is provided below the retreat hole (31). One end of the communication hole (32) passes through the retreat hole (31), and the other end of the communication hole (32) leads to the outside.

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