CN105569775A - Exhaust muffler and vehicle with same - Google Patents

Abstract

An exhaust muffler, comprising a muffler housing, a first partition, a first exhaust pipe and a second exhaust pipe, the first partition divides the muffler housing into a first muffler chamber and a second muffler chamber, the first The exhaust pipe is located in the first muffler chamber, the second exhaust pipe is sleeved on the first exhaust pipe, and can slide along the axis direction of the first exhaust pipe, between the first exhaust pipe and the second exhaust pipe A section of sleeve area is formed, and the end of the second exhaust pipe away from the sleeve area extends into the second muffler chamber, and the end of the second exhaust pipe located in the second muffler chamber is sealed, and is connected with the exhaust air through an elastic member. The muffler is connected, and the second through hole and the third through hole are respectively provided on the pipe wall of the first exhaust pipe and the second exhaust pipe relative to the sleeve area, and the second exhaust pipe is located in the second muffler chamber. A fourth through hole is provided on the pipe wall. The present invention can change the overlapping area of the first through hole and the second through hole according to the size of the air flow, thereby automatically adjusting the noise elimination frequency, and has better noise elimination effect.

Description

Exhaust muffler and vehicle having same

technical field

The invention relates to the technical field of vehicles, in particular to an exhaust muffler and a vehicle with the same.

Background technique

The automobile exhaust system is an important part of the automobile. The exhaust system will also bring the combustion noise to the rear of the vehicle while discharging the exhaust gas, which makes the rear of the vehicle generate order noise and friction noise with a high sound pressure level. Noise If it is transmitted to the passenger compartment, it may excite the acoustic cavity mode of the passenger compartment and cause the acoustic cavity resonance of the passenger compartment, seriously affecting the NVH (Noise, Vibration, Harshness, vibration, and harshness) of the vehicle. With the improvement of living standards, people's requirements for complete vehicles have changed from the initial means of transportation to comfortable household necessities. Therefore, in addition to stricter requirements on the power of models, consumers also have more and more requirements on the noise of complete vehicles. High, the whole vehicle must have relatively quiet noise when driving, accelerating, and idling.

At present, the mufflers on most mid-to-low-end models are mufflers with a constant cross-sectional area of air flow, and the muffler center frequency is fixed. As the engine speed increases, the noise frequency increases, and the muffler's muffler effect decreases; only a few high-end cars A muffler with a variable muffler frequency is used above. Fig. 1 is a structural schematic diagram of a muffler with a variable muffler frequency in the prior art. As shown in Fig. 1, the muffler includes a muffler exhaust pipe 111, an end cover 112 and a torsion spring 113, The end cover 112 is located at the outlet of the muffler exhaust pipe 111, and is connected with the muffler exhaust pipe 111 by a torsion spring 113. When the engine stops working, the air velocity in the muffler exhaust pipe 111 is zero. At this moment, the end cover 112 is in the The function of the torsion spring 113 is blocked on the muffler exhaust pipe 111. When the engine is running, the airflow flows along the muffler exhaust pipe 111, and the originally closed end cover 112 is reopened. As the engine speed increases, the displacement increases. , the airflow speed increases, the force on the end cover 112 will also increase, the opening of the end cover 112 at the outlet of the muffler exhaust pipe 111 will also become larger, and the cross-sectional area of the airflow will become larger, so the muffler The sound frequency also increases.

In the prior art, the muffler with variable muffler frequency has only one hole in the exhaust pipe, that is, the area of only one hole can be changed to adjust the muffler frequency, which cannot achieve a better muffler effect.

Contents of the invention

The object of the present invention is to provide an exhaust muffler and a vehicle with it. The exhaust muffler has a plurality of exhaust holes with adjustable cross-sectional areas, can automatically adjust the muffler frequency according to the condition of the engine, and has better muffler performance. Effect.

The present invention provides an exhaust muffler, comprising a muffler shell, a first partition, a first exhaust pipe and a second exhaust pipe, the first partition divides the muffler shell into a first muffler chamber and a second exhaust pipe. The second muffler chamber, the first exhaust pipe is located in the first muffler chamber, the second exhaust pipe is sleeved on the first exhaust pipe, and can be Sliding in the direction of the axis, an overlapped sleeve area is formed between the first exhaust pipe and the second exhaust pipe, and the end of the second exhaust pipe away from the sleeve area extends into the first exhaust pipe. In the second muffler chamber, the end of the second exhaust pipe located in the second muffler chamber is sealed, and connected to the exhaust muffler through an elastic member, between the first exhaust pipe and the A second through hole and a third through hole are respectively provided on the pipe wall of the second exhaust pipe relative to the sleeve area, and on the pipe wall of the second exhaust pipe located in the second muffler chamber A fourth through hole is provided.

Further, a first baffle and a second baffle are provided on the outer wall of the second exhaust pipe, and the first baffle and the second baffle are respectively located on both sides of the first partition.

Further, both the second through hole and the third through hole are multiple, and are respectively arranged along the axial direction of the first exhaust pipe and the second exhaust pipe, and the second through hole The hole has the same shape as the third through hole.

Further, when the second exhaust pipe is in an unstretched state, in the sleeve area, the second through hole is spaced from the third through hole, and the second through hole is connected to the first through hole. The three through holes do not overlap at all, and when the second exhaust pipe is in a fully extended state, the second through hole and the third through hole completely overlap in the sleeve area.

Further, both the second through hole and the third through hole are waist-shaped holes.

Further, the distance between two adjacent second through holes is greater than or equal to the length of the third through hole, and the distance between two adjacent third through holes is greater than or equal to the length of the second through hole.

Further, shock-absorbing gaskets are provided between the first baffle plate and the second baffle plate, and the first baffle plate, and between the second baffle plate and the first baffle plate With shock absorbing mesh.

Further, a fifth through hole is further provided on the pipe wall at the end of the first exhaust pipe away from the sleeve area.

Further, the exhaust muffler further includes a second partition, and the first partition and the second partition divide the muffler housing into the first muffler chamber, the second muffler chamber and the second muffler chamber. A third muffler chamber, the third muffler chamber is provided with a first through hole, and the elastic member is arranged between the second partition plate and the end of the second exhaust pipe.

The present invention also provides a vehicle with the exhaust muffler provided by the present invention.

In summary, the present invention can change the size of the first through hole according to the size of the airflow through the arrangement of the first partition, the first exhaust pipe, the second exhaust pipe, the first through hole, the second through hole and the elastic member. The overlapping area with the second through hole enables the exhaust muffler to have a plurality of exhaust holes with adjustable cross-sectional areas, which can automatically adjust the muffler frequency according to the condition of the engine, and has a better muffler effect.

The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable , the following preferred embodiments are specifically cited below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is the structure schematic diagram of the muffler with variable muffler frequency in the prior art

Fig. 2 is a schematic structural diagram of an exhaust muffler provided by an embodiment of the present invention.

Fig. 3 is a front view of the exhaust muffler in Fig. 1 .

Fig. 4 is an exploded view of the structure of the exhaust muffler in Fig. 1 .

Fig. 5 is a schematic cross-sectional view of the second exhaust pipe in Fig. 1 in a contracted state.

FIG. 6 is a schematic cross-sectional view of the second exhaust pipe in FIG. 1 in a stretched state.

detailed description

In order to further illustrate the technical means and functions adopted by the present invention to achieve the intended invention purpose, the present invention will be described in detail below in conjunction with the accompanying drawings and preferred embodiments.

The present invention provides an exhaust muffler. FIG. 2 is a schematic structural diagram of the exhaust muffler provided by the embodiment of the present invention. FIG. 3 is a front view of the exhaust muffler in FIG. 1 , and FIG. 4 is a structural decomposition of the exhaust muffler in FIG. 1 As shown in FIGS. 2 to 4 , the exhaust muffler includes a muffler housing 10 , a first partition 21 , a second partition 22 , a first exhaust pipe 31 and a second exhaust pipe 32 .

The first partition 21 and the second partition 22 divide the muffler housing 10 into the first muffler chamber 41, the second muffler chamber 42 and the third muffler chamber 43 in turn, and the second partition 22 is provided with a first through hole. 221 , the airflow in the second muffler chamber 42 can enter the third muffler chamber 43 through the first through hole 221 , and the end of the muffler housing 10 on the side of the third muffler chamber 43 is provided with an air outlet 11 .

The first exhaust pipe 31 is fixed to the end of the muffler housing 10 on one side of the first muffler chamber 41, and communicates between the outside of the muffler housing 10 and the first muffler chamber 41, and the second exhaust pipe 32 is sleeved on the On the first exhaust pipe 31, and can slide along the axial direction of the first exhaust pipe 31, a section of overlapped sleeve area is formed between the first exhaust pipe 31 and the second exhaust pipe 32 (see Fig. 4 and Fig. In Fig. 5, the first exhaust pipe overlaps with the second exhaust pipe), the end of the second exhaust pipe 32 away from the sleeve area extends into the second muffler chamber 42, and the second exhaust pipe 32 is located in the second muffler chamber The end of one end in 42 is sealed, and is connected with the exhaust muffler through elastic member 50, such as a spring. In this embodiment, the elastic member 50 is disposed between the end of the second exhaust pipe 32 and the second separator 22 . The second exhaust pipe 32 can be stretched relative to the first exhaust pipe 31 under the action of the airflow and the elastic member 50 (that is, to move toward the direction in which the length of the sleeve area decreases) or shrink (that is, to move toward the direction in which the length of the sleeve area decreases). large directional movement) movement. A second through-hole 311 and a third through-hole 321 are respectively provided on the pipe wall of the first exhaust pipe 31 and the second exhaust pipe 32 relative to the sleeve area. A fourth through hole 322 is provided on the pipe wall in the acoustic chamber 42 , and a fifth through hole 312 is provided on the pipe wall at the end of the first exhaust pipe 31 away from the sleeve area.

In this embodiment, there are multiple second through holes 311 and third through holes 321, and they are respectively arranged along the axial direction of the first exhaust pipe 31 and the second exhaust pipe 32, and the second through holes 311 The shape is equal to that of the third through hole 321 .

Specifically, both the second through hole 311 and the third through hole 321 can be waist-shaped holes, the distance between two adjacent second through holes 311 is greater than or equal to the length of the third through hole 321, and the distance between two adjacent second through holes 321 is greater than or equal to the length of the third through hole 321. The distance between the three through holes 321 is greater than or equal to the length of the second through hole 311 . When the second exhaust pipe 32 is in the unstretched state, the second through hole 311 and the third through hole 321 are arranged at intervals in the sleeve area, and the second through hole 311 and the third through hole 321 do not overlap at all, that is, each The second through hole 311 is disposed between two adjacent third through holes 321 , and each third through hole 321 is disposed between two adjacent second through holes 311 .

A first baffle plate 323 and a second baffle plate 324 are also provided on the outer wall of the second exhaust pipe 32, and the first baffle plate 323 and the second baffle plate 324 are respectively located on both sides of the first dividing plate 21. When the baffle 323 is in contact with the first partition 21, it can prevent the second exhaust pipe 32 from continuing to extend under the action of the air flow and the elastic member 50, and when the second baffle 324 is in contact with the first partition 21, it can prevent the second row of exhaust pipes The air pipe 32 continues to shrink under the action of the airflow and the elastic member 50 , that is, the first baffle 323 and the second baffle 324 can make the second exhaust pipe 32 only move within a certain range. In this embodiment, the movable distance of the second exhaust pipe 32 should not be less than the length of the first through hole 221 and the second through hole 311, that is, when the second baffle plate 324 is in contact with the first partition plate 21, the second The second exhaust pipe 32 is in a fully contracted state, the second through hole 311 does not overlap with the third through hole 321 at all, and when the first baffle plate 323 is in contact with the first partition 21, the second exhaust pipe 32 is in a fully extended state , the second through hole 311 completely overlaps with the third through hole 321 .

Further, damping gaskets 325 are provided between the first baffle plate 323 and the second baffle plate 324 and the first partition plate 21, and shock absorbing pads 325 are also provided between the second baffle plate 324 and the first partition plate 21. Stuxnet 326.

Fig. 5 is a schematic cross-sectional view of the second exhaust pipe in Fig. 1 in a contracted state, and Fig. 6 is a schematic cross-sectional view of the second exhaust pipe in Fig. 1 in a stretched state, as shown in Fig. 5 and Fig. In the exhaust muffler provided by the present invention, the second exhaust pipe 32 is in a contracted state, and the second baffle plate 324 abuts against the first partition 21. When the air flow enters the muffler from the first exhaust pipe 31, a part of the air flow from The fifth through hole 312 enters the first anechoic cavity 41, the sound energy is weakened for the first time, and another part of the airflow enters the second exhaust pipe 32, and then is discharged from the fourth through hole 322 on the second exhaust pipe 32, and the sound energy Can go through a second weakening. Due to the sealing of the end of the second exhaust pipe 32, under the action of the gas entering the second exhaust pipe 32, the second exhaust pipe 32 compresses the elastic member 50 and starts to stretch toward the second dividing plate 22 (i.e. 4 and 5), so that the second through hole 311 and the third through hole 321 that do not overlap originally begin to overlap, and the airflow enters the first fire through the overlapping part of the second through hole 311 and the third through hole 321. Acoustic cavity 41, the overlapping part of the second through hole 311 and the third through hole 321 forms a resonant cavity together with the first muffler cavity 41, because the overlapping area of the second through hole 311 and the third through hole 321 is small and The volume of the first muffler chamber 41 remains unchanged, and the muffler has a better muffler effect on low-frequency noise; as the engine speed increases, the airflow and noise frequency also increase accordingly, and the airflow continues to push the second exhaust pipe 32 Moving in the direction of the second partition 22, the overlapping area of the second through hole 311 and the third through hole 321 increases continuously. When the first baffle 323 abuts against the first partition 21, the second exhaust pipe 32 is In the stretched state, the second through hole 311 and the third through hole 321 are completely overlapped in the sleeve area. Since the overlapping area of the second through hole 311 and the third through hole 321 is also increasing when the airflow increases, therefore, At this time, it will have a better noise reduction effect on higher frequency noise.

The present invention also provides a vehicle with the above-mentioned exhaust muffler. For other features of the vehicle, please refer to the prior art, which will not be repeated here.

In summary, the present invention can change the size of the first through hole according to the size of the airflow through the arrangement of the first partition, the first exhaust pipe, the second exhaust pipe, the first through hole, the second through hole and the elastic member. The overlapping area with the second through hole enables the exhaust muffler to have a plurality of exhaust holes with adjustable cross-sectional areas, which can automatically adjust the muffler frequency according to the condition of the engine, and has a better muffler effect.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, may use the technical content disclosed above to make some changes or modify them into equivalent embodiments with equivalent changes, but as long as they do not depart from the technical solution of the present invention, the Technical Essence Any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the technical solution of the present invention.

Claims (10)

1. An exhaust muffler, characterized in that: comprising a muffler housing (10), a first dividing plate (21), a first exhaust pipe (31) and a second exhaust pipe (32), the first The partition (21) divides the muffler housing (10) into a first muffler chamber (41) and a second muffler chamber (42), and the first exhaust pipe (31) is located in the first muffler chamber ( 41), the second exhaust pipe (32) is sleeved on the first exhaust pipe (31), and can slide along the axial direction of the first exhaust pipe (31), the first An overlapping sleeve area is formed between the exhaust pipe (31) and the second exhaust pipe (32), and the end of the second exhaust pipe (32) extending away from the sleeve area extends into the In the second muffler chamber (42), the end of the second exhaust pipe (32) located at one end in the second muffler chamber (42) is sealed, and is connected to the exhaust muffler through an elastic member (50). connected to each other, a second through hole (311) and a third through hole (311) and a third through hole are respectively provided on the wall of the first exhaust pipe (31) and the second exhaust pipe (32) relative to the sleeve area. A hole (321), a fourth through hole (322) is provided on the pipe wall of the second exhaust pipe (32) located in the second muffler chamber (42). 2. The exhaust muffler according to claim 1, characterized in that: the outer wall of the second exhaust pipe (32) is provided with a first baffle (323) and a second baffle (324), the The first baffle (323) and the second baffle (324) are respectively located on both sides of the first partition (21). 3. The exhaust muffler according to claim 2, characterized in that: the second through-hole (311) and the third through-hole (321) are multiple, and are respectively along the first exhaust The pipe (31) and the second exhaust pipe (32) are arranged in the axial direction, and the shape of the second through hole (311) is the same as that of the third through hole (321). 4. The exhaust muffler according to claim 3, characterized in that: when the second exhaust pipe (32) is in an unstretched state, in the sleeve area, the second through hole (311) Set apart from the third through hole (321), the second through hole (311) does not overlap with the third through hole (321) at all, when the second exhaust pipe (32) is fully extended state, in the sleeve area, the second through hole (311) and the third through hole (321) completely overlap. 5. The exhaust muffler according to claim 3, characterized in that: the second through hole (311) and the third through hole (321) are waist-shaped holes. 6. The exhaust muffler according to claim 5, characterized in that: the distance between two adjacent second through holes (311) is greater than or equal to the length of the third through hole (321), and the distance between adjacent two through holes (311) is greater than or equal to the length of the third through hole (321). The distance between the third through holes (321) is greater than or equal to the length of the second through holes (311). 7. The exhaust muffler according to claim 2, characterized in that: the first baffle (323), the second baffle (324) and the first partition (21) are all provided There is a shock-absorbing pad (325), and a shock-absorbing net (326) is also provided between the second baffle (324) and the first partition (21). 8. The exhaust muffler according to claim 1, characterized in that: a fifth through hole (312) is also provided on the wall of the end of the first exhaust pipe (31) away from the sleeve area. ). 9. The exhaust muffler according to claim 1, characterized in that: the exhaust muffler further comprises a second partition (22), the first partition (21) and the second partition (22) ) divides the muffler housing (10) into the first muffler chamber (41), the second muffler chamber (42) and the third muffler chamber (43), on the third muffler chamber (43) A first through hole (221) is provided, and the elastic member (50) is arranged between the second separator (22) and the end of the second exhaust pipe (32). 10. A vehicle, characterized by comprising the exhaust muffler according to any one of claims 1-9.