CN218542376U - A reel structure automobile muffler assembly - Google Patents

Abstract

The technical problem to be solved by the utility model is to provide a reel structure automobile muffler assembly, which can be arranged and designed with sufficient volume and suitable expansion ratio in the limited and narrow space of the whole vehicle to reduce the exhaust noise of the automobile engine; in the production stage, The position of the baffle is relatively not fixed, and the fixed position is selected according to the actual design requirements, which is convenient for tuning and achieves the expected noise reduction effect. It includes the muffler cylinder, the inlet pipe and the outlet pipe. The first partition, the second partition and the third partition are arranged in turn, and the first partition, the second partition and the third partition divide the inner cavity of the muffler cylinder from front to back into the first Expansion chamber, second expansion chamber, third expansion chamber and resonance chamber.

Description

A reel structure automobile muffler assembly

technical field

The utility model relates to the field of automobile mufflers, in particular to an automobile muffler assembly with a reel structure.

Background technique

Larger silencing volume and higher expansion ratio are the keys to the silencing capacity of low- and medium-frequency passive mufflers. Therefore, it is necessary to set the target volume and reasonable expansion ratio of the muffler according to the original exhaust noise of the automobile engine and the noise reduction target, and the compact floor space usually restricts the overall shape and structure design of the muffler.

The muffler is made of stainless steel, divided according to the cross-sectional structure, usually there are two kinds of regular cross-section and special-shaped cross-section. If the commonly used drum muffler structure with regular section is adopted, the muffler has the problems of insufficient muffler volume and relatively small expansion. If the muffler cylinder is formed by welding the upper and lower clam shells with special shapes, although the appropriate volume and expansion ratio can be obtained, the position of the partition is relatively fixed, and it is difficult to tune the sound, it is difficult to achieve the expected noise reduction effect, and the cost is high. For example, the prior art (the utility model patent with notification number CN205936782U) discloses a muffler with a built-in heat shield, which includes an upper shell, a lower shell, an air inlet pipe and an air outlet pipe. The muffler is provided with a mixing area and a heat shield located in the mixing area, the heat shield is located below the inlet pipe and the outlet pipe, and the heat shield is located above the lower casing . However, the defect of this type of muffler is that during the muffler tuning stage in the production process, the position of the partition is often fixed. If the position of the partition needs to be adjusted, it is usually necessary to open multiple sets of new partition molds, which not only increases the production cost, but also It is not conducive to obtaining a better internal noise reduction structure.

Utility model content

The technical problem to be solved by the utility model is to provide a reel structure automobile muffler assembly, which can be arranged and designed with sufficient volume and suitable expansion ratio in the limited and narrow space of the whole vehicle to reduce the exhaust noise of the automobile engine; in the production stage , The position of the partition is relatively not fixed, and the fixed position is selected according to the actual design requirements, which is convenient for tuning and achieves the expected noise reduction effect.

The utility model is achieved through the following technical solutions:

An automobile muffler assembly with a reel structure, including a muffler cylinder body, an air inlet pipe and an air outlet pipe, the inner chamber of the muffler cylinder body is provided with a first partition, a second partition board and a third partition board in sequence from front to back The first partition, the second partition and the third partition divide the inner chamber of the muffler cylinder from front to back into the first expansion chamber, the second expansion chamber, the third expansion chamber and the resonance chamber, so The first partition and the second partition are provided with several air holes;

The air intake pipe runs through the front end cover, the first partition, and the second partition of the muffler cylinder in sequence from front to back, and the tail end of the air intake pipe is located in the third expansion chamber;

The air outlet pipe runs through the rear end cover, the third partition, the second partition, and the first partition of the muffler cylinder in sequence from back to front, and the head end of the air outlet pipe is located in the first expansion cavity;

A core pipe runs through the third separator.

Further, there are two air outlet pipes, and the tail pipe of the air outlet pipe extends to the outside of the rear end cover and bends downward.

Further, the air inlet pipe and the air outlet pipe are provided with several air outlet holes on the pipe wall in the second expansion cavity.

Further, the second expansion cavity is filled with sound-absorbing cotton surrounding the walls of the inlet pipe and the outlet pipe.

Further, the surfaces of the front end cover and the rear end cover are processed with outwardly protruding convex cavities by deep drawing process.

Further, the muffler cylinder is made by rolling process, and the first partition, the second partition and the third partition have interference fit with the inner wall of the muffler cylinder and are fixed by spot welding.

Compared with the prior art, the utility model has the following beneficial effects:

1. The first partition, the second partition and the third partition divide the inner cavity of the muffler cylinder from front to back into the first expansion chamber, the second expansion chamber, the third expansion chamber and the resonance chamber. It runs through the front end cover, the first partition, and the second partition of the muffler cylinder from front to back, and the outlet pipe runs through the rear end cover, the third partition, the second partition, and the second partition of the muffler from back to front. A partition, the air inlet pipe and the air outlet pipe are distributed in parallel in space,

In the limited and narrow space of the whole vehicle, the first expansion chamber, the second expansion chamber and the third expansion chamber can be connected to ensure sufficient volume and appropriate expansion ratio to reduce the exhaust noise of the automobile engine;

The inner cavity of the muffler cylinder is of equal cross-section. In the manufacturing stage, each partition can be fixed at different positions according to the design requirements, thereby changing the volume of each expansion cavity, which is convenient for tuning and achieves the expected noise reduction effect without It is necessary to redesign and change the area and shape, so it is no longer necessary to re-open multiple sets of partition molds, which greatly reduces production costs;

2. There is a core tube running through the third partition corresponding to the resonant cavity. Because the airflow will not directly enter the resonant cavity, the overall temperature of the resonant cavity is low, and the rear end cover will not affect the appearance due to high temperature discoloration. absorption, thereby improving the noise reduction effect;

3. The air inlet pipe and the air outlet pipe are provided with several air outlet holes on the pipe wall of the second expansion chamber, and the second expansion chamber is filled with sound-absorbing cotton surrounding the pipe wall of the air inlet pipe and the air outlet pipe, and part of the gas directly enters the second expansion chamber. 2. Expand the cavity, thereby reducing the gas flow rate and absorbing sound for noise reduction;

4. The surfaces of the front end cover and the rear end cover are both processed with a convex cavity protruding outward, which can maximize the volume of the cavity without interfering with other parts, thereby increasing the expansion ratio of the muffler.

Description of drawings

Fig. 1 is the structure schematic diagram of the car muffler assembly of reel structure described in the utility model;

Fig. 2 is the schematic diagram of the working state of the reel structure automobile muffler assembly described in the utility model;

In the figure: 1. Silencer cylinder, 2. Intake pipe, 3. Outlet pipe, 4. Front end cover, 5. Rear end cover, 6. First partition, 7. Second partition, 8. Third partition , 9, resonant cavity, 10, core tube, 11, vent hole, 12, tail pipe.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments of the present application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present application.

In the description of the utility model, it should be understood that the orientations or positional relationships indicated by the terms "front", "rear", "upper", "lower", "left", "right" etc. are based on those shown in the accompanying drawings. Orientation or positional relationship is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the utility model. limit. Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in Figure 1, this embodiment discloses a reel structure automotive muffler assembly, which mainly includes a muffler cylinder 1, an air inlet pipe 2 and two outlet pipes 3, and the muffler cylinder 1 is made of a reel through a stainless steel plate. The front end cover 4 and the rear end cover 5 of the muffler cylinder 1 are fixed with lock seam connection. Normally, the front end cover 4 and the rear end cover 5 are flat stainless steel plates. In order to maximize the volume of the cavity and increase the expansion ratio of the muffler without interfering with other parts, the front end cover 4 and the rear end cover The surface of 5 all adopts deep-drawing process to process the convex cavity that protrudes outwards. The inner cavity of the muffler cylinder 1 is distributed with a first partition 6 , a second partition 7 and a third partition 8 in sequence from front to back, because the muffler cylinder 1 between the front end cover 4 and the rear end cover 5 The cross section remains unchanged, the shape and size of the first partition 6, the second partition 7 and the third partition 8 are equal, and the first partition 6, the second partition 7 and the third partition 8 are compatible with the muffler cylinder 1 The inner wall is interference fit and fixed by spot welding. The first partition 6, the second partition 7 and the third partition 8 divide the inner cavity of the muffler cylinder 1 into the first expansion chamber, the second expansion chamber, the third expansion chamber and the resonance chamber 9 from front to back, The first partition 6 and the second partition 7 are provided with several air holes 11, so that the first expansion chamber, the second expansion chamber, and the third expansion chamber are communicated in sequence. The core tube 10 is penetrated by welding on the third partition 8. Since the resonant cavity 9 has only one inlet of the core tube 10, it is difficult for a large amount of airflow to enter the resonant cavity 9. The overall temperature of the resonant cavity 9 is relatively low, and the rear end cover 5 is not It will affect the appearance due to high temperature discoloration. In this embodiment, the resonant cavity 9 can absorb sound. The resonant cavity is composed of a sound-absorbing volume and a short tube (i.e., the core tube). The incident sound wave moves outside the short tube. When it reaches the short tube of the resonant cavity, Part of it enters the resonant cavity, and part of it propagates outside the short tube to form a transmitted wave. Due to the change of acoustic impedance at the interface, the purpose of noise reduction is achieved. , thereby improving the noise reduction effect. The inlet pipe 2 runs through the front end cover, the first partition, and the second partition of the muffler cylinder from front to back, and the tail end of the inlet pipe is located in the third expansion chamber; the two outlet pipes 3 pass through the muffler from back to front. The rear end cover of the barrel, the third partition, the second partition, the first partition, the head end of the air outlet pipe 3 are located in the first expansion cavity, and the tail pipe 12 of the air outlet pipe extends to the outside of the resonance cavity.

In order to improve the noise reduction effect, several air outlet holes are provided on the pipe wall of the inlet pipe 2 and the air outlet pipe 3 in the second expansion chamber, so that a part of the gas in the inlet pipe 2 directly enters the second expansion chamber through the air outlet holes. The second expansion cavity is filled with sound-absorbing cotton (not shown in the figure) surrounding the walls of the inlet pipe 2 and the outlet pipe 3, and the sound-absorbing cotton has a good sound-absorbing and noise-reducing effect.

As shown in Figure 2, the working principle of the reel structure automobile muffler assembly described in the present invention is that the high-pressure gas discharged from the automobile enters from the intake pipe 2, and a part of the gas enters the second expansion chamber through the vent hole 11, while most of the gas Entering the third expansion cavity, since the resonance cavity 9 has only one core tube 10, the gas does not enter the resonance cavity 9 in large quantities, but passes through the second partition 7 and the first partition 6 to enter the gas outlet pipe 3 to be discharged. The sound-absorbing cotton, each expansion cavity and the resonance cavity 9 can effectively reduce noise.

The reel structure automobile muffler assembly described in the utility model will be arranged on the left side under the rear floor of the automobile when in use, and the double tailpipe structure is adopted to reduce the exhaust back pressure. In the utility model, the volume of the muffler is increased and the expansion ratio of the muffler is increased through the front/rear end cover with the outwardly protruding convex cavity structure processed by the deep-drawing process and the muffler cylinder body. And because the cylinder part between the front and rear end covers has the same cross-section, in the manufacturing stage, each partition is adjusted in the direction of the axis of the cylinder according to the design requirements. In the NVH adjustment of the muffler, there is no need to involve the cylinder mold and The clapboard mold has been changed, which allows more freedom in the NVH tuning of the muffler, and the tuning can obtain better noise reduction effects. At the same time, because the airflow does not enter the resonant cavity, the overall temperature of the resonant cavity is low, and the rear end cover will not affect the appearance due to high temperature discoloration.

Claims (6)

1. A reel structure automobile muffler assembly is characterized in that it comprises a muffler cylinder body, an air inlet pipe and an air outlet pipe, and the inner cavity of the muffler cylinder body is provided with a first dividing plate, a second diaphragm, and a The partition and the third partition, the first partition, the second partition and the third partition divide the inner cavity of the muffler cylinder from front to back into the first expansion chamber, the second expansion chamber, and the third expansion chamber. A cavity and a resonant cavity, the first partition and the second partition are provided with several air holes; The air intake pipe runs through the front end cover, the first partition, and the second partition of the muffler cylinder in sequence from front to back, and the tail end of the air intake pipe is located in the third expansion chamber; The air outlet pipe runs through the rear end cover, the third partition, the second partition, and the first partition of the muffler cylinder in sequence from back to front, and the head end of the air outlet pipe is located in the first expansion chamber; A core pipe runs through the third separator. 2. The automobile muffler assembly with reel structure according to claim 1, characterized in that, the number of the air outlet pipes is two, and the tailpipe of the air outlet pipe extends to the outside of the rear end cover and downwards bending. 3. The automobile muffler assembly with reel structure according to claim 1, characterized in that, the air inlet pipe and the air outlet pipe are provided with several air outlet holes on the pipe wall in the second expansion chamber. 4. The automobile muffler assembly with reel structure according to claim 3, characterized in that, the second expansion chamber is filled with sound-absorbing cotton surrounding the walls of the inlet pipe and the outlet pipe. 5. The reel-structure automobile muffler assembly according to any one of claims 1-4, characterized in that, the surfaces of the front end cover and the rear end cover are processed with outwardly protruding convex cavities by drawing process. 6. The reel-structure automobile muffler assembly according to any one of claims 1-4, characterized in that, the muffler body is made by a reel process, and the first baffle, the second baffle and the The third partition has an interference fit with the inner wall of the muffler cylinder and is fixed by spot welding.

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