A muffler structure applied to a motorcycle

Abstract

The utility model discloses a kind of muffler structures applied to motorcycle, it belongs to the technical field of motorcycle muffler, it includes: connecting elbow, connecting pipe head, double-layer bifurcated shell, two muffler cylinders, inclined tail cover, drain hole and drainage connecting pipe.Waste gas enters via connecting pipe head, is evenly distributed to two independent muffler cylinders by double-layer bifurcated shell, effectively reduces exhaust back pressure, improves the exhaust efficiency and high speed performance of engine.Each muffler cylinder is provided with multistage energy dissipation part, and grading muffling and noise reduction are realized by dish and porous tube structure.Two cylinders are communicated by drainage connecting pipe, to guide the condensed water of upper cylinder into lower cylinder and discharge uniformly, prevent internal water corrosion.The utility model effectively solves the problems of poor heat dissipation, excessive back pressure, high risk of heat damage and water corrosion of single exhaust muffler.

Description

Technical Field

[0001] This utility model relates to the technical field of motorcycle parts, and in particular to a muffler structure for use in motorcycles. Background Technology

[0002] A motorcycle muffler is a device that allows airflow to pass through while attenuating noise; it is one of the important components of a motorcycle. The performance of the muffler not only affects the noise level of the motorcycle, but also has a significant impact on the engine's power, fuel consumption, torque, and other performance characteristics.

[0003] Existing two-stroke engines burn fuel mixed with lubricating oil, resulting in exhaust gases containing a significant amount of tar. Consequently, mufflers used in two-stroke engines are prone to tar buildup.

[0004] Based on this, Chinese patent document CN86105598B discloses a motorcycle muffler; it consists of an inner cylinder inserted into the rear end portion of the muffler body, with a support bracket securing the inner cylinder to the muffler body, forming a hollow portion surrounded by the muffler body, the inner cylinder, and the support bracket, and a muffler that can be detachably mounted inside the inner cylinder. This type of muffler has the advantages of simple structure, reduced tar production, and reduced exhaust noise.

[0005] However, most existing motorcycle mufflers have a single exhaust pipe structure. This single-pipe structure is prone to heat accumulation, leading to abnormally high casing temperatures and potential hazards. Specifically, current motorcycle muffler designs typically include a casing, a resonator, a tailpipe, and multiple chambers arranged sequentially from front to back within the casing. In existing technology, engine exhaust typically passes through one chamber to the second chamber, then back to the first chamber before passing through a catalytic converter containing a catalyst to achieve noise reduction and purification. However, commonly used muffler cylinders are mostly single-layer structures. The exhaust gas from the engine reaches a very high temperature as it flows through the exhaust pipe into the muffler cylinder. If this high-temperature exhaust gas is not cooled and is directly discharged into the atmosphere through the muffler tailpipe, it can easily burn the rider.

[0006] Furthermore, the single-exhaust configuration has only one exhaust passage, where exhaust gases from multiple cylinders of the engine ultimately converge. At high RPMs and throttle, the large volume of exhaust gases can easily create turbulence and congestion at the confluence point, leading to increased exhaust back pressure. Excessive exhaust back pressure can hinder the engine from smoothly expelling exhaust gases, resulting in "poor breathing." Especially for high-RPM, high-performance engines, some exhaust gases may remain inside the cylinders, affecting the intake of fresh air and thus limiting the engine's maximum power output.

[0007] Furthermore, all the high-temperature exhaust gases are discharged through a single muffler, causing the surface temperature of that muffler to become extremely high. This not only poses a greater risk to the rider but may also cause continuous baking of surrounding components, such as the rear brake pump, shock absorbers, and license plate holder, accelerating their aging. Utility Model Content

[0008] Therefore, it is necessary to provide a muffler structure for motorcycles to address the technical problem of how to improve the heat dissipation efficiency and exhaust efficiency of the muffler exhaust pipe.

[0009] A muffler structure for motorcycles includes: a connecting bend, a connecting pipe head, a double-layered bifurcated housing, two muffler cylinders, a slanted tail cap, drainage holes, and a drainage connecting pipe. One end of the connecting bend is equipped with a connecting pipe head, and the other end is connected to the double-layered bifurcated housing. The two muffler cylinders are respectively connected to the sides of the double-layered bifurcated housing. Each muffler cylinder has a slanted tail cap at its end, and several drainage holes are provided on the lower side of each muffler cylinder. The drainage connecting pipe connects the drainage holes of the two muffler cylinders.

[0010] Furthermore, each silencer cylinder includes a main cylinder, a cylinder connecting pipe, a first-stage energy dissipation section, and a second-stage energy dissipation section. One end of the main cylinder is connected to the double-layered bifurcated shell through the cylinder connecting pipe, and the other end is equipped with a slanted tail cap. The first-stage energy dissipation section is located in the middle of the inner cavity of the main cylinder, and the second-stage energy dissipation section is located at the end of the main cylinder near the slanted tail cap.

[0011] Furthermore, the two silencer cylinders are arranged adjacent to each other, one above the other; the drain hole on the lower side of the upper main cylinder is connected to the drain hole on the lower side of the lower main cylinder through a drain connecting pipe.

[0012] Furthermore, the first-stage energy dissipation unit includes a disc, a first porous tube, and a first plug. The disc is fixedly installed in the inner cavity of the main cylinder to block airflow; the first porous tube passes through the disc and its wall is evenly distributed with several air holes; the first plug is sealed to the end of the first porous tube.

[0013] Furthermore, there are two first-stage energy dissipation units, which are arranged adjacent to each other in the inner cavity of the main cylinder.

[0014] Furthermore, the second-stage energy dissipation unit includes a second porous tube and a second plug. The second porous tube is located inside the inclined tail cap, and its tube wall has a number of pores evenly distributed; the second plug is sealed to the end of the second porous tube.

[0015] Furthermore, the slanted tail cap and the axis of the muffler cylinder are at a predetermined angle.

[0016] Furthermore, the double-layered bifurcated shell has a double-layered hollow structure.

[0017] Specifically, the muffler structure is made of high-temperature resistant metal material.

[0018] Specifically, the drain hole at the bottom of the main cylinder located on the lower side serves as the final drain outlet.

[0019] In summary, the muffler structure for motorcycles provided by this utility model, through its dual-cylinder parallel design, effectively improves heat dissipation efficiency and exhaust performance, and solves the problems of internal water accumulation and heat damage. The specific technical effects of this utility model are as follows:

[0020] 1. Significantly improves exhaust efficiency and engine performance: The double-layered bifurcated shell splits exhaust gas into two independent muffler cylinders, fundamentally avoiding the exhaust congestion problem of single-row structures at high speeds, effectively reducing exhaust back pressure, making the engine "breathe" more smoothly, and helping to improve power and torque output at high speeds.

[0021] 2. Excellent heat dissipation and thermal management: The dual-cylinder layout provides a significantly increased heat dissipation surface area, allowing exhaust heat to dissipate quickly and significantly reducing the surface temperature of the muffler housing. This not only greatly reduces the risk of riders being accidentally burned, but also effectively prevents high temperatures from baking surrounding components such as the rear brake pump, shock absorbers, and license plate holder, delaying their aging and improving the overall safety and reliability of the vehicle.

[0022] 3. High-efficiency staged noise reduction: Each silencer cylinder is equipped with multiple energy dissipation sections, such as the first-stage energy dissipation section and the second-stage energy dissipation section. When the exhaust gas flows through the disc and porous tube structure, its energy and sound waves are blocked, expanded, contracted and rubbed multiple times, achieving gradual attenuation and ultimately ensuring excellent noise reduction effect, so as to effectively control exhaust noise.

[0023] 4. Automatic Drainage and Corrosion Prevention: Utilizing a series drainage design between the upper and lower cylinders, condensate in the upper silencer cylinder is automatically channeled to the lower silencer cylinder through a drain connection pipe under gravity and then discharged uniformly. This structure requires no additional power and effectively solves the corrosion problem caused by water accumulation inside the silencer, greatly extending the product's service life.

[0024] 5. Balance between compact structure and optimized performance: The slanted tail cap design not only helps guide airflow and reduce exhaust noise, but also makes the overall structure more compact and aesthetically pleasing. The two primary energy dissipation sections are arranged adjacent to each other, achieving a dual noise reduction effect within a limited space, demonstrating a good combination of structural design and performance optimization. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a muffler structure for motorcycles according to the present invention.

[0026] Figure 2 This is a partial structural diagram of a muffler structure for motorcycles according to the present invention. Detailed Implementation

[0027] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0028] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0033] Please see Figure 1 This utility model discloses a muffler structure for motorcycles, comprising: a connecting bend 1, a connecting pipe head 2, a double-layer forked shell 3, a muffler cylinder 4, a slanted tail cap 5, drainage holes 6, and a drainage connecting pipe 7; the connecting pipe head 2 is provided at one end of the connecting bend 1, and the double-layer forked shell 3 is provided at the other end of the connecting bend 1; two muffler cylinders 4 are respectively arranged adjacent to each other on the side of the double-layer forked shell 3; a slanted tail cap 5 is correspondingly provided at one end of each muffler cylinder 4, and a plurality of drainage holes 6 are provided on the lower side of each muffler cylinder 4; the drainage connecting pipe 7 is respectively connected to two muffler cylinders 4.

[0034] Specifically, this utility model discloses a muffler structure for motorcycles that adopts a layout of two parallel muffler cylinders and uses a double-layered bifurcated shell 3 to divert exhaust gas. This structure fundamentally overcomes the shortcomings of single-row mufflers: firstly, by diverting exhaust gas to two channels, it significantly reduces exhaust back pressure, making the engine's "breathing" smoother at high speeds and thus improving power output; secondly, the two cylinders provide a larger heat dissipation surface area, greatly improving heat dissipation efficiency, effectively reducing the surface temperature of the muffler, and minimizing the risk of burns and heat damage to surrounding parts; and thirdly, it provides a structural basis for subsequent drainage design.

[0035] Furthermore, each of the muffler cylinders 4 is provided with a main cylinder 401, a cylinder connecting pipe 402, a first-stage energy dissipation section 403, and a second-stage energy dissipation section 404; the cylinder connecting pipe 402 is provided at one end of the main cylinder 401, and the oblique tail cap 5 is provided at the other end of the main cylinder 401; the cylinder connecting pipe 402 is connected to the double-layered bifurcated shell 3; two first-stage energy dissipation sections 403 are arranged adjacently in the inner cavity of the main cylinder 401, and one second-stage energy dissipation section 404 is connected to the oblique tail cap 5 in the main cylinder 401.

[0036] Specifically, this utility model discloses a muffler structure for motorcycles that achieves progressive attenuation of exhaust gas energy by incorporating multi-stage energy dissipation sections, such as a first-stage energy dissipation section 403 and a second-stage energy dissipation section 404. As the exhaust gas flows through the porous pipe and air chamber, its sound waves are repeatedly reflected, interfered with, and absorbed, resulting in a more efficient and thorough noise reduction effect. This multi-stage silencing structure ensures that while improving exhaust efficiency, its core noise reduction function is not sacrificed, resulting in excellent noise control performance.

[0037] Furthermore, each of the two adjacent muffler cylinders 4 has a drain hole 6 at both ends of the lower side of the main cylinder 401. The drain connecting pipe 7 connects the two main cylinders 401 respectively. The drain hole 6 of the upper main cylinder 401 is connected to the drain connecting pipe 7, so that the upper main cylinder 401 can be connected to the drain connecting pipe 7 through the drain hole 6. In addition, the water in the upper main cylinder 401 can flow into the lower main cylinder 401 through the drain connecting pipe 7 along the corresponding drain hole 6, and then be discharged into the external environment through the drain hole of the lower main cylinder 401.

[0038] Specifically, this utility model discloses a muffler structure for motorcycles with a drainage system. Since condensation occurs inside the muffler, water accumulation can lead to internal corrosion and shorten its lifespan. Therefore, this utility model addresses this by setting drainage holes at the bottom of two cylinders and connecting them in series with a drainage pipe. This allows water accumulating in the upper cylinder to automatically flow into the lower cylinder and ultimately drain out through the drainage hole in the lower cylinder. This design eliminates the need for an additional water pump or electric device, utilizing gravity to achieve automatic drainage for both cylinders. It features a simple structure, high reliability, and significantly improves the product's durability and corrosion resistance.

[0039] Furthermore, the first-stage energy dissipation unit 403 is provided with a disc 403a, a first porous tube 403b, and a first plug 403c; the disc 403a is sealed and locked in the main cylinder 401, the first porous tube 403b is connected to the side of the disc 403a, and a plurality of air holes are evenly distributed on the side of the first porous tube 403b; the first plug 403c is sealed and connected to the end of the first porous tube 403b.

[0040] Specifically, the exhaust gas generated by the engine enters the connecting bend 1 through the connecting pipe head 2 and continues into the double-layered bifurcated housing 3. The double-layered bifurcated housing 3 evenly distributes the exhaust gas into the two adjacent muffler cylinders 4. The disc 403a provided in the first-stage energy dissipation section 403 can block the exhaust gas flowing into the main cylinder 401, thereby forcing the exhaust gas to flow into the inner cavity of the first porous pipe 403b through the air holes provided on the side of the first porous pipe 403b, and then flow to the other side of the disc 403a through its inner cavity. Thus, it can play the role of energy dissipation and noise reduction.

[0041] Specifically, the disc 403a in the muffler structure of this invention, applied to a motorcycle, obstructs the airflow, forcing the high-pressure exhaust gas to change its direction and diffuse through the tiny pores on the first porous tube 403b. This process greatly consumes the pulse energy of the exhaust gas. Simultaneously, the sound waves undergo friction and interference in the porous tube and small pores, converting sound energy into heat energy, achieving efficient energy attenuation and noise reduction. The two adjacent first-stage energy dissipation sections 403 form a double barrier, ensuring the initial noise reduction effect.

[0042] Furthermore, the second-stage energy dissipation section 404 has a second porous tube 404a and a second plug 404b; the second porous tube 404a is disposed on the side of the inclined tail cover 5, and a plurality of air holes are evenly distributed on the side of the second porous tube 404a; the second plug 404b is disposed at one end of the second porous tube 404a.

[0043] Specifically, the second-stage energy dissipation section 404, as the final noise reduction barrier, further refines the initially attenuated exhaust gas through the second porous tube 404a; the porous structure on it further scatters and absorbs sound waves, ensuring that the final exhaust noise meets regulatory requirements. The design of the angled tail cap 5 helps guide the airflow smoothly outward, reducing turbulence noise generated at the tailpipe and resulting in a cleaner exhaust sound.

[0044] In summary, the muffler structure of this utility model for motorcycles includes a connecting bend 1, a connecting pipe head 2, a double-layer forked shell 3, a muffler cylinder 4, a slanted tail cap 5, drainage holes 6, and a drainage connecting pipe 7. The connecting pipe head 2 is located at one end of the connecting bend 1, and the double-layer forked shell 3 is located at the other end. Two muffler cylinders 4 are respectively arranged adjacent to each other on the side of the double-layer forked shell 3. A slanted tail cap 5 is correspondingly located at one end of each muffler cylinder 4, and several drainage holes 6 are provided on the lower side of each muffler cylinder 4. The drainage connecting pipe 7 connects two muffler cylinders 4 respectively. Therefore, the muffler structure of this utility model for motorcycles, through its double-cylinder diversion, multi-stage energy dissipation, and series drainage structure, effectively solves the technical problem of how to improve the heat dissipation efficiency and exhaust efficiency of the muffler exhaust pipe; at the same time, it also achieves excellent noise reduction effect and corrosion resistance and durability. Therefore, the present invention provides a muffler structure for motorcycles that solves the technical problem of how to improve the heat dissipation efficiency and exhaust efficiency of the muffler exhaust pipe.

[0045] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A muffler structure for use in motorcycles, characterized in that, It includes: The assembly includes a connecting bend (1), a connecting pipe head (2), a double-layered bifurcated shell (3), two muffler cylinders (4), a slanted tail cap (5), a drain hole (6), and a drain connecting pipe (7). One end of the connecting bend (1) is provided with the connecting pipe head (2), and the other end is connected to the double-layered bifurcated shell (3). The sides of the double-layered bifurcated shell (3) are respectively connected to the two muffler cylinders (4). Each muffler cylinder (4) has a slanted tail cap (5) at its end, and each muffler cylinder (4) has several drain holes (6) on its lower side. The drain connecting pipe (7) connects the drain holes (6) of the two muffler cylinders (4).

2. The muffler structure for motorcycles according to claim 1, characterized in that: Each of the muffler cylinders (4) includes a main cylinder (401), a cylinder connecting pipe (402), a first-stage energy dissipation section (403), and a second-stage energy dissipation section (404).

3. The muffler structure for motorcycles according to claim 2, characterized in that: One end of the main cylinder (401) is connected to the double-layer bifurcated shell (3) through the cylinder connecting pipe (402), and the other end is provided with the oblique tail cover (5); the first stage energy dissipation part (403) is provided in the middle of the inner cavity of the main cylinder (401), and the second stage energy dissipation part (404) is provided in the main cylinder (401) near the oblique tail cover (5).

4. The muffler structure for motorcycles according to claim 3, characterized in that: The two silencer cylinders (4) are arranged adjacent to each other; the drain hole (6) on the lower side of the upper main cylinder (401) is connected to the lower main cylinder (401) through the drain connecting pipe (7).

5. A muffler structure for motorcycles according to claim 4, characterized in that: The first stage energy dissipation unit (403) includes a disc (403a), a first porous tube (403b), and a first plug (403c); the disc (403a) is fixedly installed in the inner cavity of the main cylinder (401) to block airflow; the first porous tube (403b) passes through the disc (403a) and its tube wall is evenly distributed with a number of air holes; the first plug (403c) is sealed to the end of the first porous tube (403b).

6. A muffler structure for motorcycles according to claim 5, characterized in that: There are two first-stage energy dissipation units (403), and the two first-stage energy dissipation units (403) are arranged adjacent to each other in the inner cavity of the main cylinder (401).

7. A muffler structure for motorcycles according to claim 6, characterized in that: The second stage energy dissipation section (404) includes a second porous tube (404a) and a second plug (404b); the second porous tube (404a) is disposed on the inner side of the inclined tail cap (5), and its tube wall is evenly distributed with a number of air holes; the second plug (404b) is sealed to the end of the second porous tube (404a).

8. A muffler structure for motorcycles according to claim 1, characterized in that: The inclined tail cap (5) is inclined at a preset angle to the axis of the muffler cylinder (4).

9. A muffler structure for motorcycles according to claim 1, characterized in that: The double-layered bifurcated shell (3) is a double-layered hollow structure.

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