JP2020148153A - Silencer - Google Patents

Abstract

To provide a silencer capable of reducing radiation sound occurring due to film vibration of an outer shell.SOLUTION: A silencer 1 having an outer shell member 2 constituting an outer wall, has a holding member 17 attached to a component 16 constituting the silencer 1 other than the outer shell member 2. Between the holding member 17 and the outer shell member 2, a closed space 19 is formed. In the closed space 19, a vibration damping member 20 is compressed and stored. In the vibration damping member 20, an interference member such as glass wool is used. The vibration damping member 20 vibrates due to the vibration of the outer shell member 2, and friction occurs due to the relative movement between the vibration damping members 20, so that part of vibration energy is converted to heat and the vibration is damped.SELECTED DRAWING: Figure 2

Description

The present invention relates to a silencer.

Conventionally, a vehicle such as an automobile having an internal combustion engine is provided with an exhaust pipe for guiding the exhaust gas discharged from the internal combustion engine to the outside, and the exhaust pipe is provided with a silencer for reducing exhaust noise.

In such a muffler, the exhaust gas flowing into the muffler may vibrate a portion having a small curvature in the outer shell constituting the muffler, and radiated sound may be generated.

As a method of reducing this radiated sound, a highly rigid inlet pipe provided in the silencer is fixed to the outer shell, or a part of the highly rigid separator is pressed against the outer shell to increase the rigidity of the outer shell. It has been proposed to make it (see Patent Documents 1 to 3).

In the method of reducing these radiated sounds, since the radiated sounds are reduced by raising the resonance frequency of the outer shell, there is a possibility that the radiated sounds are generated in a predetermined frequency region.

Further, as a method of reducing the radiated sound, a suppressing member is attached to the inner peripheral surface of a portion of the outer shell that easily vibrates so as to have a hollow portion inside, and a hole for communicating the inside of the hollow portion of the suppressing member and the inside of the silencer. By forming the suppression member, the hollow portion of the suppression member forms a resonance chamber to exert a sound deadening effect, and by providing the suppression member on the outer shell, the rigidity of the outer shell is increased and the radiated sound is reduced. It has been proposed (see Patent Document 4).

Real Fairness 6-31126 Japanese Patent Application Laid-Open No. 3-246313 Patent No. 4576239 Japanese Unexamined Patent Publication No. 2018-115577

In the silencer described in Patent Document 4, since the suppressing member is fixed only to the outer shell, there is a problem that the suppressing member vibrates together with the outer shell and the reduction of radiated sound is limited.

Therefore, an object of the present invention is to propose a silencer capable of reducing the radiated sound generated by the membrane vibration of the outer shell as compared with the silencer described in Patent Document 4.

In order to solve the above-mentioned problems, the silencer of the present invention is a silencer having an outer shell member constituting an outer wall.
It has a holding member attached to a constituent member constituting the silencer other than the outer shell member.
It is characterized in that at least a part of the vibration damping member is provided between the holding member and the outer shell member.

Further, the holding member and the constituent member may be integrally formed.

Further, the holding member and the constituent member may be configured as separate members, and the holding member and the constituent member may be rigidly connected.

Further, a closed space may be formed between the holding member and the outer shell member, and the vibration damping member may be compressed and stored in the closed space.

Further, the vibration damping member may be composed of one or a plurality of long fibers.

Further, the vibration damping member may be knitted into a tubular shape, and the holding member may be inserted and held inside the knitting member.

Further, the vibration damping member may be wound around the holding member, and the vibration damping member may be held by the holding member by a restraining member.

The silencer of the present invention has a holding member that constitutes the silencer and is partially fixed to a constituent member other than the outer shell member, and is a vibration damping member between the holding member and the outer shell member. By providing at least a part of the above, it is possible to prevent the vibration damping member from resonating with the outer shell member, and the vibration of the outer shell member can be damped by the vibration damping member to reduce the radiated sound.

A partial vertical sectional view of the silencer according to the first embodiment of the present invention. FIG. 1 is an enlarged sectional view taken along line AA of FIG. The perspective view of the constituent member and the holding member used in Example 1 of this invention. FIG. 3 is a sectional view taken along line BB in FIG. The perspective view which shows another example of the constituent member and the holding member used in Example 1 of this invention. The perspective view which shows another example of the constituent member and the holding member used in Example 1 of this invention. The perspective view which shows an example around the constituent member used in Example 2 of this invention. The perspective view which shows another example around the constituent member used in Example 2 of this invention. FIG. 8 is a sectional view taken along line CC of FIG. FIG. 3 is a perspective view of a component member, a holding member, and a vibration damping member used in the third embodiment of the present invention. The perspective view which shows the relationship of the component member, the holding member, the vibration damping member, and the restraining member used in Example 4 of this invention. A partial vertical sectional view showing an example of a silencer according to a fifth embodiment of the present invention. FIG. 12 is an enlarged sectional view taken along line DD of FIG. FIG. 2 is a perspective view of a component member and a holding member used in the silencer shown in FIG. A partial vertical sectional view showing another example of the silencer according to the fifth embodiment of the present invention. FIG. 15 is an enlarged cross-sectional view taken along line EE. FIG. 15 is a perspective view of a component member and a holding member used in the silencer shown in FIG. A partial vertical sectional view showing another example of the silencer according to the fifth embodiment of the present invention. FIG. 18 is an enlarged cross-sectional view taken along the line FF. FIG. 8 is a perspective view of a component member and a holding member used in the silencer shown in FIG. A partial vertical sectional view showing another example of the silencer according to the fifth embodiment of the present invention. FIG. 21 is a sectional view taken along line GG of FIG. FIG. 21 is a perspective view of a component member and a holding member used in the silencer shown in FIG.

A mode for carrying out the present invention will be described with reference to the examples shown in the figure.

[Example 1]
FIG. 1 is a vertical sectional view of a part of the silencer 1 according to the first embodiment of the present invention as a cross section, and FIG. 2 is a sectional view taken along line AA of FIG.

As shown in FIGS. 1 and 2, the silencer 1 has an outer shell member 2 constituting an outer wall of the silencer 1 made of a thin metal plate, and the inside of the outer shell member 2 is provided with separators 3 and 4. , The first muffling chamber 5, the second muffling chamber 6, and the third muffling chamber 7 are partitioned.

As shown in FIG. 2, an introduction hole 2a is formed in a portion of the outer shell member 2 forming the peripheral wall (outer wall) of the second sound deadening chamber 6, and an inlet pipe 9 is inserted into the introduction hole 2a to form an inlet pipe. The end of 9 is open in the second muffling chamber 6. The second muffling chamber 6 and the third muffling chamber 7 communicate with each other through a communication hole 10, the first muffling chamber 5 and the third muffling chamber 7 communicate with each other through a first communication pipe 11, and the first muffling chamber 5 and the second muffling chamber 5 communicate with each other. 6 and the third muffling chamber 7 are communicated with each other by a second communication pipe 12. The inside of the second communication pipe 12 and the second muffling chamber 6 communicate with each other through the communication hole 12a of the second communication pipe 12.

The outlet pipe 15 is arranged so as to penetrate the separators 3 and 4, one end of which opens into the first muffling chamber 5 and the other end of which is inserted into a lead-out hole 13 formed in the side wall of the third muffling chamber 7. It is provided.

In the second muffler chamber 6, as shown in FIG. 3, one end of a stay 16 which is a constituent member constituting the muffler 1 is fixed to the inner peripheral surface of the outer shell member 2 by welding or the like. ing. An insertion hole 16a is formed in the stay 16, and an inlet pipe 9 is inserted and fixed in the insertion hole 16a as shown in FIG. A rigid inlet pipe 9 is inserted and fixed in the insertion hole 16a of the stay 16, and the stay 16 has a higher rigidity than the outer shell member 2.

As shown in FIG. 3, a holding member 17 is attached to the other end of the stay 16, and the stay 16 and the holding member 17 are integrally formed.

As shown in FIGS. 3 and 4, the holding member 17 has a rectangular and flat pressing portion 17a, and the outer shells of the pressing portions 17a are formed on the outer four surfaces of the pressing portion 17a as they go outward. A wall portion 17b located on the member 2 side is formed. A flange 17c is formed on the outside of the wall portion 17b, and by fixing the flange 17c to the inner peripheral surface of the outer shell member 2 by welding or the like, the holding member 17 is attached to the inner peripheral surface of the outer shell member 2. It is fixed. The pressing portion 17a, the wall portion 17b, and the flange 17c are integrally formed. As shown in FIG. 5, the rib 18 may be formed on the pressing portion 17a to increase the rigidity of the holding member 17.

A closed space 19 is formed by the pressing portion 17a, the wall portion 17b, and the inner peripheral surface of the outer shell member 2, and the vibration damping member 20 is compressed and stored in the closed space 19.

As the vibration damping member 20, any member can be used as long as a part of the vibration energy is converted into heat to dampen the vibration. For example, short fiber or long fiber glass wool, wire mesh or heat resistant rubber can be used. And the like can be used.

In this embodiment, short fiber glass wool was used as the vibration damping member 20. Since the short fiber glass wool is three-dimensionally entwined with each other and compressed and stored in the closed space 19, when the outer shell member 2 vibrates, the vibration damping member 20 vibrates due to the vibration and vibrates. Due to the friction caused by the relative motion of the damping members 20, a part of the vibration energy is converted into heat and the vibration is damped.

The position of the holding member 17 provided on the inner peripheral surface of the outer shell member 2 is preferably provided in a portion of the second sound deadening chamber 6 that first flows through the inlet pipe 9 and is close to a flat surface having a small curvature. This is because there is a high possibility that membrane vibration will occur due to the inflow of exhaust gas in such a portion. Further, as described above, it is preferable to provide the holding member 17 so that the vibration damping member 20 is located in the entire portion of the outer shell member 2 where the film vibration is likely to occur.

As described above, since the holding member 17 is integrally formed with the stay 16 having high rigidity, even when the outer shell member 2 vibrates due to the exhaust gas, the holding member 17 and the outer shell member 2 Does not resonate. Further, the vibration of the outer shell member 2 propagates to the vibration damping member 20 in contact with the inner peripheral surface of the outer shell member 2. The propagated vibration causes relative motion between the vibration damping members 20 in contact with each other, and heat is generated by friction. By converting a part of the vibration energy into heat energy in this way, the vibration can be attenuated and the radiated sound can be reduced.

In the above embodiment, the stay 16 and the holding member 17 are integrally formed, but as shown in FIG. 6, the stay 16A and the holding member 17A are formed of separate members, and a part of each other is wrapped and welded or the like. It may be rigidly connected.

[Example 2]
In the first embodiment, the closed space 19 is formed by the pressing portion 17a, the wall portion 17b, and the inner peripheral surface of the outer shell member 2, and the vibration damping member 20 is compressed and stored in the closed space 19, but the pressing portion and The vibration damping member 20 may be sandwiched between the outer shell member 2 and the inner peripheral surface.

For example, as shown in FIG. 7, the wall portion 17b may be formed only on the three outer peripheral surfaces of the pressing portion 17a, and the opening portion 21 may be formed in a part thereof, or as shown in FIGS. 8 and 9. , A part of the holding member 17 may be fixed to the inner peripheral surface of the outer shell member 2 by welding or the like to form an opening 21 on the three outer peripheral surfaces of the pressing portion 17a. When the openings 21 are formed on the three surfaces, as shown in FIG. 9, the outer peripheral end portion 17d of the pressing portion 17a in the openings is located closer to the inner peripheral surface side of the outer shell member 2 toward the outside. It is preferable to form it by bending it so as to do so.

A vibration damping member 20 is provided between the pressing portion 17a and the inner peripheral surface of the outer shell member 2.

If it can be sandwiched, the shape of the holding portion 17a can be formed into an arbitrary cross-sectional shape such as a wavy shape and an arbitrary upper surface shape in addition to the planar shape.

Since the other structures are the same as those in the first embodiment, the description thereof will be omitted.

In the second embodiment, the same effect as in the first embodiment is obtained.

[Example 3]
In the first and second embodiments, the vibration damping member 20 is sandwiched between the pressing portion 17a and the inner peripheral surface of the outer shell member 2, but the vibration damping member composed of one or a plurality of long fibers is sandwiched. 20 is knitted into a tubular shape, and as shown in FIG. 10, the holding portion 24a of the holding member 24 is formed in the space 20B formed in the central portion of the cylindrically formed vibration damping member 20A. It may be inserted. A single layer of the vibration damping member 20A formed in a tubular shape may be provided on the outer periphery of the pressing portion 24a, or a plurality of vibration damping members 20A may be provided so as to be laminated.

As shown in FIG. 10, the holding member 24 has a flat pressing portion 24a provided so as to be separated from the inner peripheral surface of the outer shell member 2, and the pressing portion 24a and the inner peripheral surface of the outer shell member 2 have a flat pressing portion 24a. A part of the vibration damping member 20A formed in a tubular shape is compressed and sandwiched between them.

On both sides of the pressing portion 24a, a wall portion 24b located on the inner peripheral surface side of the outer shell member 2 and a flange portion 24c abutting on the inner peripheral surface of the outer shell member 2 are formed toward the outside. The flange portion 24c is fixed to the inner peripheral surface of the outer shell member 2 by welding or the like. The pressing portion 24a, the wall portion 24b, and the flange portion 24c are integrally formed to form the holding member 24. If a part of the vibration damping member 20A formed in a tubular shape is compressed and sandwiched between the pressing portion 24a and the inner peripheral surface of the outer shell member 2, the flange portion 24c can be placed on the inner circumference of the outer shell member 2. It does not have to be fixed to the surface by welding or the like. Further, the wall portion 24b and the flange portion 24c do not have to be formed.

Since the other structures are the same as those in the first and second embodiments, the description thereof will be omitted.

In the third embodiment, the same effect as in the first and second embodiments is obtained.

In the third embodiment, the vibration damping member 20A formed in a tubular shape is further formed by knitting the vibration damping member 20 made of one or a plurality of long fibers by knitting, so that the vibration of the outer shell member 2 is vibrated. Propagates to the vibration damping member 20A located on the opposite side of the pressing portion 24a. Since the vibration damping member 20A located on the opposite side of the pressing portion 24a with respect to the outer shell member 2 does not come into contact with the members other than the pressing portion 24a and is not restrained, the vibration damping member of Examples 1 and 2 described above. Compared with the one in which 20 is sandwiched between the pressing portion 17a and the outer shell member 2, it is easy to vibrate and the radiated sound can be further suppressed.

[Example 4]
In the third embodiment, the vibration damping member 20 made of one or a plurality of long fibers is knitted into a tubular shape, and the holding portion 24a of the holding member 24 is inserted into the hollow portion thereof, but they are different. A vibration damping member 20 made of one or a plurality of long fibers may be attached to the holding portion 24a of the holding member 24 by using the method.

In the fourth embodiment, as shown in FIG. 11, a vibration damping member 20 made of one or a plurality of long fibers is wound around the outer peripheral portion of the holding portion 24a of the holding member 24, and the end of the vibration damping member 20 is wound. The portion is held by the restraining member 28 with respect to the pressing portion 24a so as not to be unraveled.

Since the other structures are the same as those in the third embodiment, the description thereof will be omitted.

In the fourth embodiment, the same effect as in the third embodiment is obtained.

[Example 5]
In the above Examples 1 to 4, the stay 16 and the holding members 17 and 24 are integrally formed or rigidly connected, but the holding members 17 and 24 are members other than the outer shell member 2 that constitute the silencer. If there is, it may be formed integrally with any constituent member or rigidly connected. Further, the structure and configuration of the silencer may be any structure other than those described in the above embodiment.

For example, in the silencer 30 shown in FIGS. 12 to 14, the stopper 33, which is a constituent member for fixing the inner end portion of the inlet pipe 31 to the outer shell member 32, and the above-described first to fourth embodiments. Similar holding members 17 and 24 may be integrally formed or rigidly connected to each other.

Further, in the silencer 40 shown in FIGS. 15 to 17, the ring plate 42, which is a constituent member attached to the outer shell member 41 in order to increase the rigidity of the outer shell member 41, and the above-described first to fourth embodiments. The holding members 17 and 24 similar to the above may be integrally formed or rigidly connected to each other.

Further, in the silencer 50 shown in FIGS. 18 to 20, the separator (inner plate) 52, which is a constituent member for partitioning the inside of the outer shell member 51 to form the silencer chamber, and the same as those in the above-described first to fourth embodiments. The holding members 17 and 24 may be integrally formed or rigidly connected to each other.

Further, in addition to the above description, other than the outer shell member 2, any constituent member constituting the silencer, for example, a valve or the like, and the holding members 17 and 24 similar to those of the above-described first to fourth embodiments are integrally formed. It may be formed or rigidly connected to form.

Further, the number of the holding members 17 and 24 similar to those in the above Examples 1 to 4 may be one or a plurality. For example, in the silencer 60 shown in FIGS. 21 to 23, the rigidity of the outer shell member 61 is increased. Therefore, the reinforcing plate 62, which is a constituent member attached to the outer shell member 61, and the two holding members 17, 24 similar to those in the above-described first to fourth embodiments are integrally formed or rigidly connected to each other. You may try to do it.

Since the other structures are the same as those in the first to fourth embodiments, the description thereof will be omitted.

In the fifth embodiment, the constituent members other than the outer shell member 2 and constituting the silencers 1, 30, 40, 50, and 60 have higher rigidity than the outer shell members 2, 32, 41, 51, 61, and the exhaust gas. Even when the outer shell member 2 vibrates due to the above, the holding members 17 and 24 do not resonate with the outer shell member 2, and the vibration of the outer shell member 2 is propagated to the vibration damping members 20 and 20A to dampen the vibration. However, the radiated sound can be effectively reduced, and the same effect as those of 1 to 4 above can be obtained.

1,30,40,50,60 Silent device 2,32,41,51,61 Outer shell member 16,33,42,52,62 Component member 17,24 Holding member 20,20A Vibration damping member
28 Restraint member

Claims (7)

A silencer having an outer shell member that constitutes an outer wall.
It has a holding member attached to a constituent member constituting the silencer other than the outer shell member.
A silencer characterized in that at least a part of a vibration damping member is provided between the holding member and the outer shell member. The silencer according to claim 1, wherein the holding member and the constituent member are integrally formed. The silencer according to claim 1, wherein the holding member and the constituent member are made of separate members, and the holding member and the constituent member are rigidly connected to each other. The sound deadening according to any one of claims 1 to 3, wherein a closed space is formed between the holding member and the outer shell member, and the vibration damping member is compressed and stored in the closed space. vessel. The silencer according to any one of claims 1 to 4, wherein the vibration damping member is composed of one or a plurality of long fibers. The silencer according to claim 5, wherein the vibration damping member is knitted into a tubular shape, and the holding member is inserted and held therein. The silencer according to claim 5, wherein the vibration damping member is wound around the holding member, and the vibration damping member is held by the holding member by a restraining member.

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