Patent Grant
11852058
The present invention relates to a silencing apparatus to be installed in an exhaust path or the like of an automobile, and relates to a silencing apparatus with a sound-absorbing chamber filled with sound-absorbing fiber material and a method for manufacturing the silencing apparatus.
In the prior art, as a known silencing apparatus to be installed in an exhaust path of an automobile, a sound-absorbing chamber is filled with sound-absorbing fiber material such as glass wool. In one method of the filling with sound-absorbing fiber material, the sound-absorbing fiber material is packed into bag bodies, and the bag bodies filled with the sound-absorbing fiber material are arranged in the sound-absorbing chamber. In the method, variation in silencing effect may occur due to the gap formed between the bag bodies, and the cost of the bagging of the sound-absorbing fiber material is required. Accordingly, the filling method of directly filling a chamber serving as a sound-absorbing chamber with sound-absorbing fiber material is used.
The silencing apparatuses disclosed in Patent Documents 1, 2 are manufactured by the method of direct filling with sound-absorbing fiber material. Each of the silencing apparatuses disclosed in Patent Documents 1, 2 has an outer cylinder and a porous inner cylinder with pores penetrating the outer cylinder, and has a sound-absorbing chamber which is arranged between the inner cylinder and the outer cylinder and filled with sound-absorbing fiber material. The silencing apparatuses are manufactured by, under the state where one edge part of the outer cylinder is fixed to the inner cylinder and closed, filling the space between the inner cylinder and the outer cylinder with the sound-absorbing fiber material from the other opened edge part of the outer cylinder, and tapering and closing the other opened edge part of the outer cylinder after the filling, or closing the opening by arranging an end plate over the opening.
Although the direct filling method disclosed in Patent Documents 1, 2 is applicable to a simple configuration in which the space between a porous inner cylinder and an outer cylinder is filled with sound-absorbing fiber material, the method is hardly applied to a silencing apparatus in a complicated configuration having the inside of a shell partitioned into plural sections by a partition. Therefore, a silencing apparatus is required, which allows, even in a complicated configuration having the inside of a shell partitioned by a partition, a sound-absorbing chamber to be filled with sound-absorbing fiber material without a gap.
The present invention is proposed by taking the above problem into consideration, to provide a silencing apparatus which allows, even in a complicated configuration having the inside of a shell partitioned by a partition, a sound-absorbing chamber to be filled with sound-absorbing fiber material without a gap, and a method for manufacturing the silencing apparatus.
The silencing apparatus according to the present invention includes a shell, a ventilation pipe communicating with the inside of the shell, an insertion hole which is formed in the shell so as to have a size smaller than a surrounding skirt part and allows the ventilation pipe to be loosely inserted in, and a partition partitioning the inside of the shell. In the silencing apparatus, a sound-absorbing chamber partitioned by the partition and positioned adjacent to the insertion hole is filled with a sound-absorbing fiber material, and a sound-absorbing fiber material filling gap between a peripheral edge of the insertion hole and the ventilation pipe is closed by an annular closing member.
The silencing apparatus allows to fill the sound-absorbing chamber partitioned by the partition and positioned adjacent to the insertion hole with the sound-absorbing fiber material through the sound-absorbing fiber material filling gap, thereby enabling to fill the sound-absorbing chamber with the sound-absorbing fiber material without a gap even in a complicated configuration having the inside of the shell partitioned by the partition. Therefore, this enables to prevent and suppress the variation in silencing effect from occurring. Moreover, such direct filling with the sound-absorbing fiber material through the sound-absorbing fiber material filling gap eliminates the cost and work of bagging of the sound-absorbing fiber material, resulting in reducing the manufacturing costs and improving the efficiency in manufacturing.
The silencing apparatus according to the present invention includes a first ventilation pipe and a second ventilation pipe communicating with the inside of the shell, a first insertion hole which is formed in the shell so as to have a size smaller than a surrounding skirt part and allows the first ventilation pipe to be loosely inserted in, and a second insertion hole which is formed in the shell so as to have a size smaller than a surrounding skirt part and allows the second ventilation pipe to be loosely inserted in. In the silencing apparatus, at least, a first sound-absorbing chamber partitioned by a first partition and positioned adjacent to the first insertion hole is filled with the sound-absorbing fiber material, and a first sound-absorbing fiber material filling gap between a peripheral edge of the first insertion hole and the first ventilation pipe is closed by a first annular closing member.
Accordingly, the silencing apparatus may have the first sound-absorbing chamber filled with the sound-absorbing fiber material, or the silencing apparatus may have a chamber partitioned by the second partition and positioned adjacent to the second insertion hole to be filled with the sound-absorbing fiber material as necessary so as to additionally serve as the second sound-absorbing chamber, resulting in that the silencing apparatus is available in various configurations having the same basic configuration differed in the number of sound-absorbing chambers. In an example, a silencing apparatus for an automobile with a turbocharger may be provided with only the first sound-absorbing chamber, and a silencing apparatus for a hybrid automobile may be provided with the first sound-absorbing chamber and the second sound-absorbing chamber. From the viewpoint of commonization of the basic configuration of the silencing apparatus, the manufacturing costs are reduced, and the efficiency in manufacturing is improved.
In the silencing apparatus according to the present invention, a second sound-absorbing chamber partitioned by a second partition and positioned adjacent to the second insertion hole is filled with the sound-absorbing fiber material, and a second sound-absorbing fiber material filling gap between a peripheral edge of the second insertion hole and the second ventilation pipe is closed by a second annular closing member.
Accordingly, the arrangement of the first sound-absorbing chamber and the second sound-absorbing chamber filled with the sound-absorbing fiber material enables to produce higher silencing performance in the silencing apparatus.
In the silencing apparatus according to the present invention, the partition is formed in a plate shape, and the plate-shape partition has a large number of communication holes not allowing the sound-absorbing fiber material to pass through, substantially over the whole surface.
This enables to implement the filling with the sound-absorbing fiber material through the sound-absorbing fiber material filling gap by using a negative pressure in the adjacent chamber which is partitioned by the partition and positioned adjacent to the chamber to be filled with the sound-absorbing fiber material and is made negative in pressure, regardless of the opening location and opening position of the ventilation pipe in the inside of the shell, thereby enabling to fill the sound-absorbing chamber with the sound-absorbing fiber material without a gap in a higher level with less variation in density. Accordingly, the variation in silencing effect is reliably prevented and suppressed from occurring.
In the silencing apparatus according to the present invention, the insertion hole is formed in a shape without any outward protrusion, and the annular closing member is arranged so as to cover the insertion hole.
In the silencing apparatus, the insertion hole has a shape without any outward protrusion formed by burring or the like, and this enhances the flexibility of the shape and configuration of a filling nozzle for use in the filling with the sound-absorbing fiber material, improves the flexibility in the manufacturing steps, and improves the productivity. This further enhances the flexibility of the operation and enlarges the range in the operation of the filling nozzle for use in the filling with the sound-absorbing fiber material, thereby enabling to fill the sound-absorbing chamber with the sound-absorbing fiber material without a gap in a higher level.
In the silencing apparatus according to the present invention, a connection pipe to be connected to the ventilation pipe is internally fitted to the peripheral edge of the insertion hole, and the annular closing member fitted in an inner circumference of the connection pipe is externally fitted to the ventilation pipe.
The usage of the annular closing member fitted in the inner circumference of the connection pipe for closing the sound-absorbing fiber material filling gap eliminates the needs of preparing and fixing an extra annular closing member in addition to the connection pipe. This reduces the component costs and the manufacturing costs, and reduces the manufacturing steps.
The method for manufacturing a silencing apparatus according to the present invention is to manufacture the silencing apparatus according to the present invention, and includes, under the state where an adjacent chamber positioned adjacent to a sound-absorbing corresponding chamber serving as the sound-absorbing chamber via the partition is made negative in pressure, a filling step of filling the sound-absorbing corresponding chamber with the sound-absorbing fiber material from a filling nozzle inserted in the sound-absorbing fiber material filling gap, and a closing step of closing the sound-absorbing fiber material filling gap with the annular closing member after the filling with the sound-absorbing fiber material.
The method enables to fill the sound-absorbing chamber with the sound-absorbing fiber material without a gap in a higher level with less variation in density by using the negative pressure in the adjacent chamber, thereby enabling to reliably prevent and suppress the variation in silencing effect from occurring in the manufactured silencing apparatus. The method enables to, after the filling with the sound-absorbing fiber material, easily close the sound-absorbing fiber material filling gap with the annular closing member, resulting in achieving efficient manufacturing.
The method for manufacturing a silencing apparatus according to the present invention is to manufacture the silencing apparatus according to the present invention including the first partition and the second partition respectively formed in plate shapes and respectively provided with large numbers of communication holes not allowing the sound-absorbing fiber material to pass through substantially over whole surfaces. The method includes the steps of, under the state where an expansion chamber positioned adjacent to a first sound-absorbing corresponding chamber serving as the first sound-absorbing chamber via the first partition is made negative in pressure by air suction through the second ventilation pipe, filling the first sound-absorbing corresponding chamber with the sound-absorbing fiber material from a filling nozzle inserted in the first sound-absorbing fiber material filling gap, and closing the first sound-absorbing fiber material filling gap with the first annular closing member after the filling, and the steps of, under the state where the expansion chamber positioned adjacent to a second sound-absorbing corresponding chamber serving as the second sound-absorbing chamber via the first partition is made negative in pressure by air suction through the first ventilation pipe, filling the second sound-absorbing corresponding chamber with the sound-absorbing fiber material from a filling nozzle inserted in the second sound-absorbing fiber material filling gap, and closing the second sound-absorbing fiber material filling gap with the second annular closing member after the filling.
The method enables to fill the first sound-absorbing chamber and the second sound-absorbing chamber with the sound-absorbing fiber material by using the negative pressure in the same expansion chamber. Moreover, in the filling of the first sound-absorbing corresponding chamber with the sound-absorbing fiber material, air is sucked through the second ventilation pipe, while in the filling of the second sound-absorbing corresponding chamber with the sound-absorbing fiber material, air is sucked through the first ventilation pipe, so that the first sound-absorbing chamber and the second sound-absorbing chamber are able to be filled with the sound-absorbing fiber material also by using the suction force. Thus, the first sound-absorbing chamber and the second sound-absorbing chamber are able to be filled with the sound-absorbing fiber material without a gap in a higher level with less variation in density in a reliable manner. Accordingly, the variation in the silencing effect in the manufactured silencing apparatus is more reliably prevented and suppressed from occurring. After the filling with the sound-absorbing fiber material, the first and second sound-absorbing fiber material filling gaps are able to be easily closed by the first and second annular closing members, respectively, resulting in achieving efficient manufacturing.
The silencing apparatus according to the present invention has the effect allowing to fill a sound-absorbing chamber with sound-absorbing fiber material without a gap, even in a complicated configuration having the inside of a shell partitioned by a partition.
A silencing apparatus 1 of the first embodiment according to the present invention is configured to be installed in an exhaust path of an automobile, and includes, as shown in
Each of the ventilation pipes 3, 4 is included in an exhaust pipe. The illustrated ventilation pipe 3 serves as an exhaust inlet pipe, and the ventilation pipe 4 serves as an exhaust outlet pipe. The ventilation pipe 3 is included in a first ventilation pipe which communicates with the inside of the shell 2, and the ventilation pipe 4 is included in a second ventilation pipe which communicates with the inside of the shell 2.
The insertion holes 5, 6 in which the ventilation pipes 3, 4 are loosely inserted are the through holes formed in the shell 2 so as to have sizes larger than the diameters of the ventilation pipes 3, 4, respectively. The insertion hole 5 is included in a first insertion hole in which the first ventilation pipe is inserted loosely, and is formed so as to have a size smaller than a surrounding skirt part 51 configured with the shell 2, and further so as to be opened at the tip part of a rising part 52 formed by burring or the like. The insertion hole 6 is included in a second insertion hole in which the second ventilation pipe is inserted loosely, and is formed so as to have a size smaller than a surrounding skirt part 61 configured with the shell 2, and further so as to be opened at the tip part of a rising part 62 formed by burring or the like.
The partitions 7, 8 are respectively formed in flat-plate shapes. The flat-plate-shape partitions 7, 8 respectively have large numbers of communication holes 71, 81 which are arranged in lines substantially over the whole surfaces thereof and do not allow a sound-absorbing fiber material 9 to be described later to pass therethrough. Each of the communication holes 71, 81 may have any diameter, as long as the diameter does not allow the sound-absorbing fiber material 9 to pass through the hole, and is preferably, for example, approx. 2 mm to 5 mm. The partition 7 is included in a first partition, and the partition 8 is included in a second partition.
The internal space of the shell 2 which is partitioned by the partition 7 corresponding to the first partition and positioned adjacent to the insertion hole 5 corresponding to the first insertion hole serves as a sound-absorbing chamber 10 corresponding to a first sound-absorbing chamber. The sound-absorbing chamber 10 is filled with the sound-absorbing fiber material 9. The internal space of the shell 2 which is partitioned by the partition 8 corresponding to the second partition and is positioned adjacent to the insertion hole 6 corresponding to the second insertion hole serves as a sound-absorbing chamber 11 corresponding to a second sound-absorbing chamber. The sound-absorbing chamber 11 is also filled with the sound-absorbing fiber material 9. It is noted that appropriate fiber material having a sound-absorbing function, such as glass wool, is available as the sound-absorbing fiber material 9 to be filled.
The internal space of the shell 2 between the partition 7 corresponding to the first partition and the partition 8 corresponding to the second partition serves as an expansion chamber 12. The ventilation pipe 3 is arranged in the internal space of the shell 2 so as to be opened in the expansion chamber 12 by being inserted through an insertion hole 72 formed in the partition 7. The ventilation pipe 4 is arranged in the internal space of the shell 2 so as to be opened in the expansion chamber 12 by being inserted through an insertion hole 82 formed in the partition 8.
Between the peripheral edge of the insertion hole 5 corresponding to the first insertion hole and the ventilation pipe 3 corresponding to the first ventilation pipe, a sound-absorbing fiber material filling gap 13 corresponding to a first sound-absorbing fiber material filling gap is provided so as to allow a filling nozzle 100 to be inserted therein to fill the sound-absorbing chamber 10 corresponding to the first sound-absorbing chamber with the sound-absorbing fiber material 9. The sound-absorbing fiber material filling gap 13 is closed by an annular closing member 14 corresponding to a first annular closing member (refer to
As shown in
Between the peripheral edge of the insertion hole 6 corresponding to the second insertion hole and the ventilation pipe 4 corresponding to the second ventilation pipe, a sound-absorbing fiber material filling gap 15 corresponding to a second sound-absorbing fiber material filling gap is provided so as to allow the filling nozzle 100 to be inserted therein to fill the sound-absorbing chamber 11 corresponding to the second sound-absorbing chamber with the sound-absorbing fiber material 9. The sound-absorbing fiber material filling gap 15 is closed by an annular closing member 16 corresponding to a second annular closing member (refer to
As shown in
In the manufacturing of the silencing apparatus 1 of the first embodiment, as shown in
As shown in
As shown in
As shown in
According to the first embodiment, the sound-absorbing chambers 10, 11 which are partitioned by the partitions 7, 8 and positioned adjacent to the insertion holes 5, 6, respectively, are able to be filled with the sound-absorbing fiber material 9 through the sound-absorbing fiber material filling gaps 13, 15, whereby the sound-absorbing chambers 10, 11 are able to be filled with the sound-absorbing fiber material 9 without a gap, even in the case of the complicated configuration in which the inside of the shell 2 is partitioned by the partitions 7, 8. Therefore, this enables to prevent and suppress the variation in silencing effect from occurring. Moreover, such direct filling with the sound-absorbing fiber material 9 through the sound-absorbing fiber material filling gaps 13, 15 eliminates the cost and work of bagging of the sound-absorbing fiber material, resulting in reducing the manufacturing costs and improving the efficiency in manufacturing. The arrangement of the first sound-absorbing chamber and the second sound-absorbing chamber filled with the sound-absorbing fiber material enables to produce higher silencing performance in the silencing apparatus.
The flat-plate-shape partitions 7, 8 respectively have large numbers of communication holes 71, 81 which are arranged substantially over the whole surfaces thereof and do not allow the sound-absorbing fiber material 9 to pass therethrough, and this enables to implement the filling with the sound-absorbing fiber material 9 through the sound-absorbing fiber material filling gaps 13, 15 by using the negative pressure in the adjacent chamber which is partitioned by the partitions 7, 8 and positioned adjacent to the chambers to be filled with the sound-absorbing fiber material 9 and is made negative in pressure, regardless of the opening locations and opening positions of the ventilation pipes 3, 4 in the inside of the shell 2. This enables to fill the sound-absorbing chambers 10, 11 with the sound-absorbing fiber material 9 without a gap in a higher level with less variation in density. Accordingly, the variation in silencing effect is reliably prevented and suppressed from occurring.
In the manufacturing method including the filling with the sound-absorbing fiber material 9 under the state of the chamber positioned adjacent to the sound-absorbing corresponding chambers and made negative in pressure, the sound-absorbing chambers 10, 11 are able to be filled with the sound-absorbing fiber material 9 by using the negative pressure in the adjacent chamber without a gap in a higher level with less variation in density, thereby enabling to reliably prevent and suppress the variation in silencing effect from occurring in the manufactured silencing apparatus 1. After the filling with the sound-absorbing fiber material 9, the sound-absorbing fiber material filling gaps 13, 15 are able to be easily closed by the annular closing members 14, 16, resulting in achieving efficient manufacturing.
The sound-absorbing chambers 10, 11 are further able to be filled with the sound-absorbing fiber material 9 by using the negative pressure in the same expansion chamber 12. Moreover, in the filling of the first sound-absorbing corresponding chamber with the sound-absorbing fiber material 9, air is sucked through the ventilation pipe 4, while in the filling of the second sound-absorbing corresponding chamber with the sound-absorbing fiber material 9, air is sucked through the ventilation pipe 3, whereby the sound-absorbing chambers 10, 11 are able to be filled with the sound-absorbing fiber material 9 also by using the suction force without a gap in a higher level with less variation in density in a reliable manner. Accordingly, the variation in silencing effect in the manufactured silencing apparatus 1 is more reliably prevented and suppressed from occurring. After the filling with the sound-absorbing fiber material 9, the sound-absorbing fiber material filling gaps 13, 15 are able to be easily closed by the annular closing members 14, 16, respectively, resulting in achieving efficient manufacturing.
A silencing apparatus 1m of a modification of the first embodiment according to the present invention has the same basic configuration as the silencing apparatus 1 of the first embodiment. The chamber corresponding to the sound-absorbing chamber 11 of the silencing apparatus 1 is not filled with the sound-absorbing fiber material 9, and the chamber serves as an expansion chamber 17m. The manufacturing of the silencing apparatus 1m includes similar steps to the steps of configuring the sound-absorbing chamber 10 for the silencing apparatus 1 of the first embodiment, and further includes the step of closing the sound-absorbing fiber material filling gap 15 with the annular closing member 16 without filling the chamber serving as the expansion chamber 17m with the sound-absorbing fiber material 9. Other configurations of the silencing apparatus 1m and the method for manufacturing the silencing apparatus 1m are the same as the configurations of the silencing apparatus 1 and the method for manufacturing the silencing apparatus 1 in the first embodiment.
According to the silencing apparatus 1 of the first embodiment and the silencing apparatus 1m of the modification, the silencing apparatus may have the first sound-absorbing chamber filled with the sound-absorbing fiber material 9, or the silencing apparatus may additionally have the second sound-absorbing chamber to be filled with the sound-absorbing fiber material 9 as necessary, resulting in that the silencing apparatus is available in various configurations having the same basic configuration differed in the number of sound-absorbing chambers. In an example, a silencing apparatus for an automobile with a turbocharger may be provided with only the first sound-absorbing chamber, and a silencing apparatus for a hybrid automobile may be provided with the first sound-absorbing chamber and the second sound-absorbing chamber. From the viewpoint of commonization of the basic configuration of the silencing apparatus, the manufacturing costs are reduced, and the efficiency in manufacturing is improved.
A silencing apparatus 1a of the second embodiment according to the present invention is also configured to be installed in an exhaust path of an automobile, and includes, as shown in
Each of the ventilation pipes 3a, 4a is included in an exhaust pipe. The illustrated ventilation pipe 3a serves as an exhaust inlet pipe, and the ventilation pipe 4a serves as an exhaust outlet pipe. The insertion holes 5a, 6a in which the ventilation pipes 3a, 4a are loosely inserted are the through holes formed in the shell 2a so as to have sizes larger than the diameters of the ventilation pipes 3a, 4a, respectively. The insertion hole 5a is formed so as to have a size allowing the ventilation pipe 3a to be loosely inserted in, and the insertion hole 6a is formed so as to have a size allowing the ventilation pipe 4a to fit in. The ventilation pipe 4a is firmly fixed to the peripheral edge of the insertion hole 6a by welding or the like. The insertion hole 5a is formed so as to have a size smaller than a surrounding skirt part 51a configured with the shell 2a, in a shape without any outward protrusion.
The partitions 7a, 8a are respectively formed in flat-plate shapes. The flat-plate-shape partitions 7a, 8a respectively have communication holes 71a, 81a which have the same configurations as the communication holes 71, 81 of the first embodiment. The internal space of the shell 2a which is partitioned by the partition 7a and is positioned adjacent to the insertion hole 5a serves as a sound-absorbing chamber 10a. The sound-absorbing chamber 10a is filled with a sound-absorbing fiber material 9a which has the same configuration as the sound-absorbing fiber material 9 of the first embodiment.
The internal space of the shell 2a between the partition 7a and the partition 8a serves as an expansion chamber 12a. In addition, the internal space of the shell 2a which is partitioned by the partition 8a and is positioned adjacent to the insertion hole 6a serves as an expansion chamber 17a. The ventilation pipe 3a is arranged in the internal space of the shell 2a so as to be opened in the expansion chamber 17a by being inserted through an insertion hole 72a formed in the partition 7a and an insertion hole 83a formed in the partition 8a. The ventilation pipe 4a is arranged in the internal space of the shell 2a so as to be opened in the expansion chamber 12a by being inserted through an insertion hole 82a formed in the partition 8a.
Between the peripheral edge of the insertion hole 5a and the ventilation pipe 3a, a sound-absorbing fiber material filling gap 13a is provided so as to allow the filling nozzle 100 to be inserted therein to fill the sound-absorbing chamber 10a with the sound-absorbing fiber material 9a. The sound-absorbing fiber material filling gap 13a is closed by an annular closing member 14a arranged so as to cover the insertion hole 5a. As shown in
The inner cylinder part 142a of the annular closing member 14a is arranged along the outer circumference of the ventilation pipe 3a, and is firmly fixed to the ventilation pipe 3a by welding at a welding part W5 such as the tip part of the inner cylinder part 142a. The end-widened part 144a provided at the tip of the outer cylinder part 143a of the annular closing member 14a is arranged at the peripheral edge of the insertion hole 5a along the outer peripheral surface of the shell 2a, and is firmly fixed to the shell 2a by welding at a welding part W6 such as the tip part of the end-widened part 144a.
In the manufacturing of the silencing apparatus 1a of the second embodiment, as shown in
As shown in
The second embodiment enables to produce the effects corresponding to the first embodiment due to the corresponding configurations. The insertion hole 5a has a shape without any outward protrusion formed by burring or the like, and this enhances the flexibility of the shape and configuration of the usable filling nozzle 100 for use in the filling with the sound-absorbing fiber material 9a, improves the flexibility in the manufacturing steps, and improves the productivity. This further enhances the flexibility of the operation and enlarges the range in the operation of the filling nozzle 100 for use in the filling with the sound-absorbing fiber material 9a, thereby enabling to fill the sound-absorbing chamber 10a with the sound-absorbing fiber material 9a without a gap in a higher level.
A silencing apparatus 1b of the third embodiment according to the present invention is also configured to be installed in an exhaust path of an automobile, and includes, as shown in
Each of the ventilation pipes 3b, 4b is included in an exhaust pipe. The illustrated ventilation pipe 3b serves as an exhaust inlet pipe, and the ventilation pipe 4b serves as an exhaust outlet pipe. The insertion holes 5b, 6b in which the ventilation pipes 3b, 4b are loosely inserted are the through holes formed in the shell 2b so as to have sizes larger than the diameters of the ventilation pipes 3b, 4b, respectively. The insertion hole 5b is formed so as to have a size allowing the ventilation pipe 3b to be loosely inserted in, and the insertion hole 6b is formed so as to have a size allowing the ventilation pipe 4b to fit in. The ventilation pipe 4b is firmly fixed to the peripheral edge of the insertion hole 6b by welding or the like. The insertion hole 5b is formed so as to have a size smaller than a surrounding skirt part Mb configured with the shell 2b, and further so as to be opened at the tip part of a rising part 52b formed by burring or the like.
The partitions 7b, 8b are respectively formed in flat-plate shapes. The flat-plate-shape partitions 7b, 8b respectively have communication holes 71b, 81b which have the same configurations as the communication holes 71, 81 of the first embodiment. The internal space of the shell 2b which is partitioned by the partition 7b and is positioned adjacent to the insertion hole 5b serves as a sound-absorbing chamber 10b. The sound-absorbing chamber 10b is filled with a sound-absorbing fiber material 9b which has the same configuration as the sound-absorbing fiber material 9 of the first embodiment.
The internal space of the shell 2b between the partition 7b and the partition 8b serves as an expansion chamber 12b. In addition, the internal space of the shell 2b which is partitioned by the partition 8b and is positioned adjacent to the insertion hole 6b serves as an expansion chamber 17b. The ventilation pipe 3b is arranged, as with the ventilation pipe 3a of the second embodiment, in the internal space of the shell 2b so as to be opened in the expansion chamber 17b by being inserted through an insertion hole 72b formed in the partition 7b and an insertion hole 83b formed in the partition 8b. The ventilation pipe 4b is arranged in the internal space of the shell 2b so as to be opened in the expansion chamber 12b by being inserted through an insertion hole 82b formed in the partition 8b.
Between the peripheral edge of the insertion hole 5b and the ventilation pipe 3b, a sound-absorbing fiber material filling gap 13b is provided so as to allow the filling nozzle 100 to be inserted therein to fill the sound-absorbing chamber 10b with the sound-absorbing fiber material 9b. A connection pipe 18b to be connected to the ventilation pipe 3b is internally fitted to the peripheral edge of the insertion hole 5b, specifically in the present embodiment the connection pipe 18b is internally fitted to the rising part 52b of the insertion hole 5b, and an annular closing member 14b which is formed of metal mesh or the like and is fitted in the inner circumference of the connection pipe 18b is externally fitted to the ventilation pipe 3b. The sound-absorbing fiber material filling gap 13b is closed by the annular closing member 14b due to the internal fitting and the external fitting. The shell 2b and the connection pipe 18b are firmly fixed to each other at a welding part W7 such as the tip part of the rising part 52b.
In the manufacturing of the silencing apparatus 1b of the third embodiment, as shown in
As shown in
The third embodiment enables to produce the effects corresponding to first embodiment due to the corresponding configurations. The usage of the annular closing member 14b fitted in the inner circumference of the connection pipe 18b for closing the sound-absorbing fiber material filling gap 13b eliminates the needs of preparing and fixing an extra annular closing member in addition to the connection pipe 18b. Thus, this reduces the component costs and the manufacturing costs, and reduces the manufacturing steps.
The invention disclosed herein includes not only the respective aspects described as the invention and the respective embodiments, but also, within the applicable range, the aspect specified by changing some contents disclosed herein to other contents disclosed herein, the aspect specified by adding other contents disclosed herein to the contents disclosed herein, and the aspect specified by deleting some contents disclosed herein to the limit allowing to produce partial effects so as to make generic concept. The invention disclosed herein includes the modifications and additions to be described below.
In an example, although the silencing apparatuses 1a, 1b of the second and third embodiments are provided with the expansion chambers 17a, 17b, respectively, the present invention further includes a silencing apparatus in which a chamber corresponding to the expansion chamber 17a or 17b is filled with the sound-absorbing fiber material 9a or 9b as with the sound-absorbing chamber 11 of the first embodiment, and serves as a sound-absorbing chamber. The number of the sound-absorbing chambers and the number of the expansion chambers in the silencing apparatus according to the present invention may be appropriately set as necessary within the scope of the purport of the present invention.
In the present invention, any type of partition is available as long as the partition is able to partition the inside of the shell. In the case of a plate-shape partition in the present invention, the partition may have not only a flat-plate shape as with the partitions 7, 7a, 7b and the partitions 8, 8a, 8b in the embodiments described above, but also an appropriate plate shape, for example, a curved plate shape, an undulated plate shape, a corrugated plate shape, or a dome shape.
The present invention is applicable to a silencing apparatus to be installed in, for example, an exhaust path of an internal combustion engine for an automotive.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2019-040318 | Mar 2019 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2020/004996 | 2/7/2020 | WO |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2020/179363 | 9/10/2020 | WO | A |
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| Number | Date | Country | |
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| 20220065144 A1 | Mar 2022 | US |
