An oddly shaped muffler for a large-displacement motorcycle

Abstract

This utility model belongs to the technical field of mufflers, and relates to an irregularly shaped muffler for large-displacement motorcycles. It includes a flat muffler cylinder, within which a muffler assembly is disposed, connecting an intake chamber and an exhaust chamber. The muffler cylinder is connected to the engine's exhaust port via the exhaust assembly. The exhaust chamber is connected to the outside via a first tailpipe and a second tailpipe arranged side-by-side along its long side. The intake chamber and the exhaust assembly are connected via a conical connector. The cross-sectional area of ​​the conical connector gradually decreases from the muffler cylinder towards the exhaust assembly. The exhaust assembly includes a rear connecting pipe, a catalytic sleeve, a first exhaust pipe, and a second exhaust pipe. The first and second exhaust pipes are respectively connected to the two exhaust ports of a motorcycle's twin-cylinder engine. The irregularly shaped muffler for large-displacement motorcycles provided by this utility model has higher exhaust efficiency and can better meet the emission requirements of large-displacement motorcycles.

Description

Technical Field

[0001] This utility model belongs to the technical field of mufflers, and relates to an irregularly shaped muffler for large-displacement motorcycles. Background Technology

[0002] A motorcycle muffler is a device used to treat exhaust emissions from motorcycle engines, reducing engine noise and environmental pollution. An exhaust muffler consists of an exhaust pipe and a muffler cylinder, with a catalyst installed inside either the exhaust pipe or the muffler cylinder. The catalyst is a cylindrical material with a honeycomb-like center, used to purify the exhaust gases emitted by the engine.

[0003] For large-displacement motorcycles, the requirements for muffler emissions, layout, and noise reduction effect are higher. Chinese invention patent application CN109458247A (publication date: March 12, 2019) discloses a non-standard motorcycle muffler for large-displacement engines, including an exhaust pipe, a front chamber, and a rear chamber. The exhaust pipe is connected to a catalyst I via an exhaust pipe connecting pipe. The catalyst I is installed in the front chamber, and the rear chamber is connected to the front chamber via a conduit. This muffler is an improvement for large-displacement motorcycles, optimizing its shape and increasing the internal space. However, it still suffers from poor exhaust flow, especially insufficient exhaust efficiency. Therefore, there is still room for further improvement in mufflers for large-displacement motorcycles. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies by providing a uniquely shaped muffler for large-displacement motorcycles, which has higher exhaust efficiency and can better meet the emission requirements of large-displacement motorcycles.

[0005] To solve the above-mentioned technical problems, the objective of this utility model is achieved through the following technical solution: A uniquely shaped muffler for a large-displacement motorcycle includes a flat muffler cylinder. A muffler assembly connecting an intake chamber and an exhaust chamber is disposed within the muffler cylinder. The muffler cylinder is connected to the engine's exhaust port via the exhaust assembly. The exhaust chamber is connected to the outside via a first tailpipe and a second tailpipe arranged parallel along its long side. The intake chamber and the exhaust assembly are connected via a conical connector. The cross-sectional area of ​​the conical connector gradually decreases from the muffler cylinder towards the exhaust assembly. The exhaust assembly includes a rear connecting pipe, a catalyst sleeve, a first exhaust pipe, and a second exhaust pipe. The two ends of the rear connecting pipe are respectively connected to the conical connector and the catalyst sleeve. A catalyst is disposed within the catalyst sleeve. The first and second exhaust pipes are simultaneously connected to the front end of the catalyst sleeve. The first and second exhaust pipes are respectively connected to the two exhaust ports of a motorcycle's two-cylinder engine.

[0006] In the aforementioned irregularly shaped muffler for a large-displacement motorcycle, a front oxygen sensor is provided on the front side of the catalyst and a rear oxygen sensor is provided on the rear side; both the front and rear oxygen sensors are installed via oxygen sensor connectors.

[0007] In the aforementioned irregularly shaped muffler for a large-displacement motorcycle, a support plate is provided at the rear end of the muffler cylinder cavity. The support plate is provided with a first support hole and a second support hole for the first tailpipe and the second tailpipe to pass through. A rear end cover is connected to the rear end of the muffler cylinder. The support plate and the rear end cover form a support cavity. The first tailpipe and the second tailpipe pass through the support cavity and are inclined downward.

[0008] In the aforementioned irregularly shaped muffler for a large-displacement motorcycle, a bracket is provided between the support plate and the rear end cover. The bracket is located on both sides of the first tailpipe and the second tailpipe. The front end of the bracket is attached to the support plate and fixed by welding, and the rear end is attached to the rear end cover and fixed by fasteners.

[0009] In the aforementioned irregularly shaped muffler for a large-displacement motorcycle, a first mounting plate is provided on the muffler cylinder, and the first mounting plate is fixedly connected to the muffler cylinder by an annular hoop. A second mounting plate is provided on the catalyst sleeve, and the second mounting plate is welded and fixed to the outer wall of the catalyst sleeve.

[0010] In the aforementioned irregularly shaped muffler for a large-displacement motorcycle, the conical connector is connected to the rear connecting pipe via a pipe joint. The rear end of the pipe joint is fixedly connected to the inner wall of the conical connector, and the front end is fixedly connected to the outer wall of the rear connecting pipe. The front end of the pipe joint has an axial opening and is locked by a clamp.

[0011] In the aforementioned irregularly shaped muffler for a large-displacement motorcycle, the catalyst sleeve includes a catalyst tube body, a front cone cover, and a rear cone cover. The cross-sectional area of ​​the front cone cover gradually decreases from back to front and is connected to the first exhaust pipe and the second exhaust pipe. The cross-sectional area of ​​the rear cone cover gradually decreases from front to back and is connected to the rear connecting pipe.

[0012] In the aforementioned irregularly shaped muffler for a large-displacement motorcycle, the muffler assembly includes an air intake chamber, an exhaust chamber, and an intermediate chamber arranged from front to back within the muffler cylinder. The air intake chamber and the intermediate chamber are connected through a first inner pipe, and the intermediate chamber and the exhaust chamber are connected through a second inner pipe.

[0013] Compared with the prior art, this utility model has the following advantages: This invention provides an irregularly shaped muffler for large-displacement motorcycles, employing a flattened cylindrical body and a dual tailpipe structure arranged side-by-side along the long sides. This increases the cross-sectional area of ​​the exhaust passage, making the exhaust process smoother, reducing exhaust back pressure, and meeting the high displacement requirements of large-displacement motorcycles. This invention also utilizes a double-cone catalytic sleeve to better facilitate the convergence of the dual-cylinder exhaust pipes, and provides more space for catalytic converter installation. A conical connector ensures a stable connection between the exhaust components and the intake chamber, resulting in better intake efficiency and further improving exhaust efficiency. Therefore, this irregularly shaped muffler has higher exhaust efficiency and can better meet the emission requirements of large-displacement motorcycles. Attached Figure Description

[0014] Figure 1 This is a perspective view of the present invention; Figure 2 This is a cross-sectional view of the silencer cylinder of this utility model; Figure 3 This is a perspective view of the silencer cylinder of this utility model (excluding the rear end cover); Reference numerals in the attached drawings: 1. Muffler cylinder; 2. Intake chamber; 3. Exhaust chamber; 4. First tailpipe; 5. Second tailpipe; 6. Conical connector; 7. Rear connecting pipe; 8. Catalyst sleeve; 9. First exhaust pipe; 10. Second exhaust pipe; 11. Front oxygen sensor; 12. Support plate; 13. Rear end cover; 14. Support cavity; 15. Bracket; 16. First mounting plate; 17. Annular clamp; 18. Second mounting plate; 19. Pipe joint. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-3 : A non-standard muffler for a large-displacement motorcycle includes a flat muffler cylinder 1. A muffler assembly is disposed within the muffler cylinder 1, connecting an intake chamber 2 and an exhaust chamber 3. The muffler cylinder 1 is connected to the engine's exhaust port via the exhaust assembly. The exhaust chamber 3 is connected to the outside via a first tailpipe 4 and a second tailpipe 5 arranged parallel along its long side. The intake chamber 2 is connected to the exhaust assembly via a conical connector 6. The cross-sectional area of ​​the conical connector 6 gradually decreases from the muffler cylinder 1 towards the exhaust assembly. The exhaust assembly includes a rear connecting pipe 7, a catalyst sleeve 8, a first exhaust pipe 9, and a second exhaust pipe 10. The two ends of the rear connecting pipe 7 are respectively connected to the conical connector 6 and the catalyst sleeve 8. A catalyst is disposed within the catalyst sleeve 8. The first exhaust pipe 9 and the second exhaust pipe 10 are simultaneously connected to the front end of the catalyst sleeve 8. The first exhaust pipe 9 and the second exhaust pipe 10 are respectively connected to the two exhaust ports of a motorcycle's two-cylinder engine.

[0016] The exhaust gas produced by the engine is discharged through its two exhaust ports, entering the first exhaust pipe 9 and the second exhaust pipe 10 respectively. After converging, it enters the catalyst sleeve 8. The catalyst in the catalyst sleeve 8 purifies the exhaust gas. The purified exhaust gas enters the intake chamber 2 of the muffler body 1, and after being silenced by the silencing structure inside the muffler body 1, it is discharged through the first tailpipe 4 and the second tailpipe 5.

[0017] In this embodiment, the noise reduction assembly includes an air intake chamber 2, an exhaust chamber 3, and an intermediate chamber arranged from front to back within the muffler cylinder 1. The air intake chamber 2 and the intermediate chamber are connected through a first inner pipe, and the intermediate chamber and the exhaust chamber 3 are connected through a second inner pipe. As the gas flows through the above-mentioned noise reduction structure, the noise gradually attenuates, thereby achieving the effect of noise reduction.

[0018] The catalyst is provided with a front oxygen sensor 11 and a rear oxygen sensor (not shown in the attached figure) on its front side and rear side, respectively. Both the front oxygen sensor 11 and the rear oxygen sensor are installed through oxygen sensor connectors. The front oxygen sensor 11 detects the exhaust gas discharged from the exhaust port, and the rear oxygen sensor detects the exhaust gas after it has been purified by the catalyst, which can better monitor the purification effect and state of the catalyst. Preferably, the front oxygen sensor 11 is located at the confluence of the first exhaust pipe 9 and the second exhaust pipe 10, and the rear oxygen sensor is located at the rear end of the catalyst sleeve 8.

[0019] A support plate 12 is provided at the rear end of the inner cavity of the above-mentioned muffler cylinder 1. The support plate 12 is provided with a first support hole and a second support hole for the first tail pipe 4 and the second tail pipe 5 to pass through. The rear end of the muffler cylinder 1 is connected to a rear end cover 13. The support plate 12 and the rear end cover 13 form a support cavity 14. The first tail pipe 4 and the second tail pipe 5 pass through the support cavity 14 and are inclined downward. By setting the support plate 12, the first tail pipe 4 and the second tail pipe 5 can be better supported, making the dual tail pipe structure more stable.

[0020] A bracket 15 is provided between the support plate 12 and the rear end cover 13. The bracket 15 is located on both sides of the first tail tube 4 and the second tail tube 5. The front end of the bracket 15 is attached to the support plate 12 and fixed by welding, and the rear end is attached to the rear end cover 13 and fixed by fasteners. By setting the bracket 15, the installation stability of the rear end cover 13 and the first tail tube 4 and the second tail tube 5 can be further increased.

[0021] The specific installation structure of this embodiment is as follows: a first mounting plate 16 is provided on the muffler cylinder 1, and the first mounting plate 16 is fixedly connected to the muffler cylinder 1 by an annular hoop 17. A second mounting plate 18 is provided on the catalyst sleeve 8, and the second mounting plate 18 is welded and fixed to the outer wall of the catalyst sleeve 8.

[0022] Furthermore, the tapered connector 6 is connected to the rear connecting pipe 7 via a pipe joint 19. The rear end of the pipe joint 19 is fixedly connected to the inner wall of the tapered connector 6, and the front end is fixedly connected to the outer wall of the rear connecting pipe 7. The front end of the pipe joint 19 is provided with an axial opening and is locked by a clamp.

[0023] Furthermore, the catalyst sleeve 8 includes a catalyst tube body, a front conical cover, and a rear conical cover. The cross-sectional area of ​​the front conical cover gradually decreases from back to front and is connected to the first exhaust pipe 9 and the second exhaust pipe 10. The cross-sectional area of ​​the rear conical cover gradually decreases from front to back and is connected to the rear connecting pipe 7.

[0024] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A non-standard muffler for a large-displacement motorcycle, comprising a flat muffler cylinder (1), wherein a muffler assembly communicating with an intake chamber (2) and an exhaust chamber (3) is disposed within the muffler cylinder (1), and the muffler cylinder (1) is connected to the exhaust port of the engine via the exhaust assembly, characterized in that, The exhaust chamber (3) is connected to the outside through the first tailpipe (4) and the second tailpipe (5) arranged in parallel along the long side. The intake chamber (2) is connected to the exhaust assembly through the conical connector (6). The cross-sectional area of ​​the conical connector (6) gradually decreases from the muffler cylinder (1) towards the exhaust assembly. The exhaust assembly includes a rear connecting pipe (7), a catalyst sleeve (8), a first exhaust pipe (9), and a second exhaust pipe (10). The two ends of the rear connecting pipe (7) are respectively connected to the conical connector (6) and the catalyst sleeve (8). A catalyst is provided inside the catalyst sleeve (8). The first exhaust pipe (9) and the second exhaust pipe (10) are simultaneously connected to the front end of the catalyst sleeve (8). The first exhaust pipe (9) and the second exhaust pipe (10) are respectively connected to the two exhaust ports of the motorcycle twin-cylinder engine.

2. The irregularly shaped muffler for a large-displacement motorcycle according to claim 1, characterized in that, The catalyst is provided with a front oxygen sensor (11) on the front side and a rear oxygen sensor on the rear side.

3. The irregularly shaped muffler for a large-displacement motorcycle according to claim 1, characterized in that, The rear end of the inner cavity of the muffler cylinder (1) is provided with a support plate (12). The support plate (12) is provided with a first support hole and a second support hole for the first tail pipe (4) and the second tail pipe (5) to pass through. The rear end of the muffler cylinder (1) is connected to a rear end cover (13). The support plate (12) and the rear end cover (13) form a support cavity (14). The first tail pipe (4) and the second tail pipe (5) pass through the support cavity (14) and are inclined downward.

4. The irregularly shaped muffler for a large-displacement motorcycle according to claim 3, characterized in that, A bracket (15) is provided between the support plate (12) and the rear cover (13). The bracket (15) is located on both sides of the first tail tube (4) and the second tail tube (5). The front end of the bracket (15) is attached to the support plate (12) and fixed by welding, and the rear end is attached to the rear cover (13) and fixed by fasteners.

5. The irregularly shaped muffler for a large-displacement motorcycle according to claim 1, characterized in that, The muffler cylinder (1) is provided with a first mounting plate (16), which is fixedly connected to the muffler cylinder (1) by an annular hoop (17). The catalyst sleeve (8) is provided with a second mounting plate (18), which is welded and fixed to the outer wall of the catalyst sleeve (8).

6. The irregularly shaped muffler for a large-displacement motorcycle according to claim 1, characterized in that, The tapered connector (6) is connected to the rear connecting pipe (7) through a pipe joint (19). The rear end of the pipe joint (19) is fixedly connected to the inner wall of the tapered connector (6), and the front end is fixedly connected to the outer wall of the rear connecting pipe (7). The front end of the pipe joint (19) is provided with an axial opening and is locked by a clamp.

7. The irregularly shaped muffler for a large-displacement motorcycle according to claim 1, characterized in that, The catalyst sleeve (8) includes a catalyst tube body, a front cone cover and a rear cone cover. The cross-sectional area of ​​the front cone cover gradually decreases from back to front and is connected to the first exhaust pipe (9) and the second exhaust pipe (10). The cross-sectional area of ​​the rear cone cover gradually decreases from front to back and is connected to the rear connecting pipe (7).

Images