CN113286699B - Silencer for motor vehicle - Google Patents
Silencer for motor vehicle Download PDFInfo
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- CN113286699B CN113286699B CN202080008472.5A CN202080008472A CN113286699B CN 113286699 B CN113286699 B CN 113286699B CN 202080008472 A CN202080008472 A CN 202080008472A CN 113286699 B CN113286699 B CN 113286699B
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- fiber layer
- fiber
- muffler
- fibers
- silencer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
- B60R13/02—Internal Trim mouldings ; Internal Ledges; Wall liners for passenger compartments; Roof liners
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
- B60R13/08—Insulating elements, e.g. for sound insulation
Abstract
A press-formed muffler for a motor vehicle includes a first fiber layer (110) and a second fiber layer (120). The first fiber layer (110) contains 60 to 99 wt% of a main fiber (115) containing a non-melting component and 1 to 40 wt% of a thermoplastic fiber (116). The second fiber layer (120) contains 50 to 100 wt% of thermoplastic fibers (126). The silencer (1) may further include a third fiber layer (130), and the third fiber layer (130) may contain 60 to 99 wt% of main fibers (135) containing a non-molten component and 1 to 40 wt% of thermoplastic fibers (136). The second fiber layer (120) may also be located between the first fiber layer (110) and the third fiber layer (130).
Description
Technical Field
The present invention relates to a press-formed muffler for an automobile.
Background
As a muffler provided in a motor vehicle, for example, a floor muffler interposed between a floor and a carpet is known. The floor silencer also has a function of preventing unevenness of the floor from appearing on the surface of the carpet, and a function of giving a good feeling of touch to the occupant when the occupant steps on the floor silencer. As a muffler for realizing these functions, for example, as shown in international publication No. 2015/146428, a fibrous muffler mainly composed of inexpensive regenerated fibers made of cloth is used.
Documents of the prior art
Patent document
Patent document 1: international publication No. 2015/146428
Disclosure of Invention
Problems to be solved by the invention
If the weight of the muffler is reduced, the treadability, which is the feeling of treading the carpet with a foot, may be reduced. Further, if the density of the silencer is low, there is a possibility that "spring force reduction" may occur in which the silencer is compressed in the thickness direction and does not return to the original thickness when the carpet is stepped on with the foot.
The above-described problems are not limited to the muffler for carpet, but also occur in various mufflers for automobiles such as a dash silencer (dash silencer).
The invention discloses a silencer for an automobile, which can obtain proper compression strength even if the silencer is light.
Means for solving the problems
The present invention provides a silencer formed by press forming for an automobile, including:
a first fiber layer containing 60 to 99 wt% of a main fiber containing a non-melting component and 1 to 40 wt% of a thermoplastic fiber; and
a second fiber layer comprising 50 to 100 wt% of thermoplastic fibers.
In addition, the present invention has a proposal that the silencer is formed by stamping for an automobile, wherein,
the muffler includes: a first fibrous layer comprising thermoplastic fibers; and a second fiber layer containing thermoplastic fibers in a weight ratio higher than that of the thermoplastic fibers contained in the first fiber layer,
the thickness of the silencer is more than 20mm,
the density of the silencer is 0.10g/cm 3 In the following, the following description is given,
the thickness of the silencer is set to Xmm, and the unit area weight of the second fiber layer is set to Yg/m 2 When the weight Y per unit area is more than or equal to 1.068. X 2 -23.12·X+176.4，
When a load of 50N is applied in the thickness direction of the silencer to a circular plate with a diameter of 50mm placed on the surface of the silencer, the distance of the silencer recess is 15mm or less.
Effects of the invention
According to the present invention, a muffler for an automobile can be provided that can achieve an appropriate compressive strength even when it is lightweight.
Drawings
Fig. 1 is a perspective view schematically illustrating the appearance of a muffler and a skin material on the vehicle cabin side.
Fig. 2 schematically illustrates a main part of a vertical end face when the muffler is cut at a position corresponding to A1-A1 in fig. 1 together with the body panel and the skin material.
Fig. 3 is a diagram schematically showing another example of the fiber structure in the second fiber layer.
Fig. 4 is a view schematically illustrating a main part of a vertical end face when other muffler is cut at a position corresponding to A1-A1 in fig. 1 together with a body panel and a skin material.
Fig. 5 is a view schematically illustrating a main part of a vertical end face when other muffler is cut at a position corresponding to A1-A1 in fig. 1 together with the body panel and the skin material.
Fig. 6 is a diagram schematically showing an example of a muffler.
Fig. 7 is a diagram schematically showing an example of measuring the amount of recess of the muffler caused by the disk to which a load is applied in the thickness direction.
Fig. 8 is a graph showing the relationship between the weight per unit area of the second fiber layer and the amount of recess of the muffler.
Fig. 9 is a graph showing the relationship between the thickness of the muffler and the weight per unit area of the second fibrous layer.
Fig. 10 is a diagram schematically showing an example of a muffler manufacturing apparatus.
Fig. 11 is a vertical end view for explaining an example of the forming process.
Detailed Description
Hereinafter, embodiments of the present invention will be described. Needless to say, the following embodiments are merely exemplary embodiments of the present invention, and not limited to all the features shown in the embodiments are essential for the solution of the present invention.
(1) Summary of the technology contained in the present invention:
first, an outline of the technique included in the present invention will be described with reference to examples shown in fig. 1 to 11. The drawings in the present application are schematically illustrating examples, and the expansion ratios in the respective directions shown in these drawings may be different from each other, and the drawings may not be matched with each other. Needless to say, each element of the present technology is not limited to the specific example shown by the reference numeral.
In the present application, the numerical range "Min to Max" means a minimum value Min or more and a maximum value Max or less.
[ scheme 1]
The press-formed muffler 1 for an automobile according to one aspect of the present technology includes a first fiber layer 110 and a second fiber layer 120. The first fiber layer 110 contains 60 to 99 wt% of main fibers 115 containing a non-melting component and 1 to 40 wt% of thermoplastic fibers 116. The second fibrous layer 120 contains 50 to 100 weight percent thermoplastic fibers 126.
As a result of repeated studies, it was found that a suitable compressive strength can be obtained even when the weight is reduced by combining the first fiber layer 110 containing a large amount of the main fibers 115 containing a non-molten component with the second fiber layer 120 obtained by increasing the weight ratio of the thermoplastic fibers. By including 50 wt% or more of the thermoplastic fibers 126 in the second fiber layer 120 formed by press forming, the thermoplastic fibers 126 welded to each other impart high rigidity to the second fiber layer 120, which is presumed to maintain the compressive strength of the muffler 1 even if the muffler 1 is made lightweight. It is also presumed that the softness is imparted to the first fiber layer 110 by including 60 wt% or more of the main fiber 115 containing a non-molten component in the first fiber layer 110 formed by press forming, which improves the touch of the muffler 1. The shape of the first fiber layer 110 is maintained by including the thermoplastic fibers 116 in an amount of 1 wt% or more in the first fiber layer 110 formed by press forming. In the silencer 1 formed by press molding, it is presumed that an appropriate compressive strength can be obtained even with a reduced weight by combining an appropriate rigidity feeling of the second fiber layer 120 and a soft touch feeling of the first fiber layer 110.
As described above, the above aspect 1 can provide a press-formed muffler for an automobile, which can obtain an appropriate compression strength even when the muffler is lightweight.
Here, the place where the muffler of the present technology can be installed includes a cabin floor portion, a cabin side wall portion, a cabin ceiling portion, a deck floor (deck floor) portion, a dash panel portion, an engine cover portion, a fender portion, and the like, and may be an interior portion or an exterior portion.
The main fiber containing a non-melting component contains a regenerated fiber such as a cloth regenerated fiber, a non-melting fiber such as a cellulose fiber, and the like.
In the present application, "first", "second", "third" \8230 ", is a term for identifying each of a plurality of components included in a plurality of components having similar points to each other, and does not indicate the order. Which of the plurality of components corresponds to "first", "second", and "third" \8230: \8230; "is relatively determined.
The thermoplastic fibers of the first fibrous layer and the thermoplastic fibers of the second fibrous layer may be the same type of fibers or different types of fibers.
The above accompanying description can be applied to the following embodiments.
[ scheme 2]
However, the thickness T0 of the muffler 1 may be 20mm or more. Alternatively, the density of the silencer 1 may be 0.10g/cm 3 The following. The thickness T0 of the muffler 1 may be Xmm, and the basis weight of the second fiber layer 120 may be Yg/m 2 When Y is not less than 1.068. X 2 -23.12. X +176.4. When a load F of 50N is applied in the thickness T0 direction of the muffler 1 to the circular plate 500 having a diameter of 50mm placed on the front surface 10 of the muffler 1, the distance by which the muffler 1 is recessed (the recess amount L0 shown in fig. 7) may be 15mm or less.
As a result of repeated studies, it was found that Y is not less than 1.068. Multidot.X for the weight per unit area Y of the second fiber layer 120 2 -23.12·X+176.4And the dent amount L0 is 15mm or less even if the density is 0.10g/cm in the muffler 1 3 Hereinafter, the feeling when pressing in the thickness direction D3 is further improved. Therefore, the above aspect 2 can provide a muffler for an automobile that can obtain a more appropriate compression strength.
[ scheme 3]
As illustrated in fig. 2, the muffler 1 may further include a third fiber layer 130, and the third fiber layer 130 may include 60 to 99 wt% of the main fiber 135 containing a non-molten component and 1 to 40 wt% of the thermoplastic fiber 136. The second fiber layer 120 may also be located between the first fiber layer 110 and the third fiber layer 130. This aspect can provide a muffler for an automobile that can further improve the tactile sensation when pushing in the thickness direction.
Here, the main fibers of the first fiber layer and the main fibers of the third fiber layer may be the same type of fibers or different types of fibers. The thermoplastic fibers of the first fiber layer and the thermoplastic fibers of the third fiber layer may be the same type of fibers or different types of fibers.
[ scheme 4]
However, a press-formed muffler 1 for an automobile according to an aspect of the present technology includes: a first fibrous layer 110 comprising thermoplastic fibers 116; and a second fiber layer 120 containing thermoplastic fibers 126 in a weight ratio higher than the weight ratio of the thermoplastic fibers 116 contained in the first fiber layer 110. The thickness T0 of the muffler 1 is 20mm or more. The density of the silencer 1 is 0.10g/cm 3 The following. The thickness T0 of the muffler 1 is set to Xmm, and the basis weight of the second fiber layer 120 is set to Yg/m 2 When Y is not less than 1.068. X 2 -23.12. X +176.4. When a load F of 50N is applied to a disc 500 having a diameter of 50mm placed on the surface 10 of the muffler 1 in the thickness direction D3 of the muffler 1, the distance by which the muffler 1 is recessed (the recess amount L0 shown in fig. 7) is 15mm or less.
As a result of repeated investigations, it was found that the second fiber layer obtained by combining the first fiber layer 110 with the thermoplastic fibers at a higher weight ratio120, Y is not less than 1.068. X is the basis weight Y of the second fiber layer 120 2 23.12. X +176.4, and the amount of recess L0 of the muffler 1 is set to 15mm or less, even if the density of the muffler 1 is 0.10g/cm 3 An appropriate compressive strength can be obtained as follows. The thermoplastic fibers 126 of the second fiber layer 120 formed by press forming are in a large weight ratio, and the weight Y per unit area of the second fiber layer 120 is not less than 1.068. X 2 23.12 · X +176.4, whereby the thermoplastic fibers 126 welded to each other impart high rigidity to the second fiber layer 120, which is presumed to maintain the compressive strength of the muffler 1 even if the muffler 1 is made lightweight. In addition, the weight ratio of the thermoplastic fibers 116 of the first fiber layer 110 formed by press forming is small, and thus flexibility is imparted to the first fiber layer 110, which is presumed to improve the touch of the muffler 1. Further, the amount of recess L0 of the muffler 1 is 15mm or less, whereby the feel of the muffler 1 is further improved. The thermoplastic fibers 116 are contained in the first fiber layer 110 formed by press forming, whereby the shape of the first fiber layer 110 is maintained. In the silencer 1 formed by press molding, it is presumed that an appropriate compressive strength can be obtained even with a reduced weight by combining an appropriate rigidity feeling of the second fiber layer 120 and a soft touch feeling of the first fiber layer 110.
As described above, the above aspect 4 can provide a press-formed muffler for an automobile, which can obtain an appropriate compression strength even when the muffler is lightweight.
(2) Specific examples of the muffler for an automobile:
fig. 1 schematically illustrates a press-formed muffler for an automobile and a press-formed skin material for an automobile. In fig. 1, front, rear, left, right, upper and lower indicate front, rear, left, right, upper and lower, respectively. The left-right positional relationship is based on a direction in which the front of the vehicle is viewed. Fig. 2 schematically illustrates a main part of the vertical end face when the muffler is cut together with the body panel and the skin material at a position corresponding to A1-A1 of fig. 1.
On a floor (a body panel 80) in a passenger compartment of a motor vehicle, the floor is generally covered and shielded by laying a carpet (a skin material) 20 as illustrated in fig. 1. This gives the passenger compartment interior design and the stepping comfort that shows a good feeling when the passenger steps on with his foot. In order to absorb the unevenness formed on the floor and to ensure the flatness of the floor surface, the floor silencer 1 functioning as a bulky material is provided between the floor and the carpet 20.
In order to improve the noise reduction performance in the vehicle interior, as illustrated in fig. 1, the muffler 1 is integrally or separately formed to cover the entire rear surface of the carpet, thereby covering the entire floor. The large muffler 1 shown in fig. 1 is formed into an integrally formed product covering the entire surface of the floor panel by forming the muffler so that the thickness and the weight per unit area are different for each region according to the unevenness of the floor panel, and is provided with a function as a bulky material. Thus, the muffler 1 simultaneously performs sound absorption and sound insulation functions with respect to noise entering from the outside of the vehicle. That is, the floor silencer laid on the body panel of the automobile is formed in a shape along the unevenness of the body panel and is used to ensure the performance of the floor portion of the vehicle such as the cushioning property and the sound insulating property. The muffler for a motor vehicle according to the present technology may be provided not only on the floor portion but also on a vehicle interior side wall portion, a vehicle interior ceiling portion, a deck floor portion, an instrument panel portion, an engine hood portion, a fender portion, and the like in accordance with the shape of the portion.
The muffler 1 for an automobile shown in fig. 1 is a functional member to be placed on a substantially flat floor (a type of body panel 80) constituting a floor surface of a vehicle body, a fender panel (a type of body panel 80) rising upward from the floor surface in a front portion of a passenger compartment, and the like. The muffler 1 for a vehicle interior is laid on the vehicle interior C1 side of the body panel 80. The muffler 1 shown in fig. 1 has a tunnel portion 14 that bulges upward in conformity with the tunnel portion of the vehicle body panel and extends in the front-rear direction, and substantially flat portions 13 that match the substantially flat portions of the vehicle body panel on the vehicle width direction outer sides from the tunnel portion 14, and is formed into a three-dimensional shape so as to follow the standing walls of the protruding portions of the console, the step panel, and the like. A carpet 20 is laid on the cabin C1 side of the muffler 1. The carpet 20 is formed into a three-dimensional shape so as to follow the standing wall of the protruding portion of the muffler 1, and decorates the passenger compartment.
The carpet 20 shown in fig. 1 is formed into a concave-convex shape 22 on the vehicle cabin C1 side by press molding, and is disposed facing the vehicle cabin C1. The uneven shape 22 includes a foot rest portion 23 located above each substantially flat portion 13 of the muffler 1. The carpet 20 is, for example, a tufted carpet having a back stitch of pile fibers 26 on a base layer 25, and a plurality of pile fibers 26 are erected on the cabin C1 side of the base layer 25. As the base fabric constituting the base layer 25, a nonwoven fabric such as a spun-bonded nonwoven fabric, a woven fabric of various fibers, or the like can be used. The backing side (the surface on the muffler 1 side) of the base fabric may be lined. The lining may be made of a resin material (including an elastomer), a fiber material, or the like. Of course, the carpet 20 may be a needle-punched carpet or the like in which fibers are entangled with each other by knitting a nonwoven fabric to form fuzz on the surface.
The muffler 1 shown in fig. 1 and 2 is provided between the body panel 80 and the carpet 20, and has a concave-convex shape formed by press forming on the first and second molding surfaces 11 and 12 opposite to each other in the thickness direction D3. Here, the first molding surface 11 is located on the carpet 20 side, and the second molding surface 12 is located on the body panel 80 side. In this case, the first molding surface 11 is a surface 10 on which the disk 500 shown in fig. 7 is placed. The silencer 1 comprises, in order from the first forming face 11 to the second forming face 12, a first fibrous layer 110, a second fibrous layer 120, and a third fibrous layer 130. The first fibrous layer 110 comprises a first shaped face 11. The second fiber layer 120 includes a first bonding surface 121 to which the first fiber layer 110 is bonded, and a second bonding surface 122 to which the second fiber layer 120 is bonded. The third fibrous layer 130 comprises a second shaped face 12.
As a result of repeated studies, it has been found that appropriate compressive strength can be obtained even when the weight of the muffler 1 is reduced, according to the conditions described below.
The first fiber layer 110 contains 60 to 99 wt% of main fibers 115 containing a non-melting component and 1 to 40 wt% of thermoplastic fibers 116. The primary fibers 115 and thermoplastic fibers 116 are collectively referred to herein as fibers 114. The fibers 114 are randomly oriented. The third fiber layer 130 contains 60 to 99 wt% of the main fiber 135 containing a non-molten component and 1 to 40 wt% of the thermoplastic fiber 136. The primary fibers 135 and thermoplastic fibers 136 are collectively referred to herein as fibers 134. The fibers 134 are randomly oriented. The second fiber layer 120, which is located between the first fiber layer 110 and the third fiber layer 130, contains 50 to 100 weight percent of thermoplastic fibers 126. That is, the fibers 124 of the second fiber layer 120 may be all thermoplastic fibers 126, or may contain secondary fibers 125 containing a non-melting component together with the thermoplastic fibers 126 as shown in fig. 3. The thermoplastic fibers 126 and secondary fibers 125 are collectively referred to herein as fibers 124. The fibers 124 are randomly oriented.
The main fibers 115 and 135 and the sub-fibers 125 may contain a non-melting component, and may be regenerated fibers such as cloth regenerated fibers, cellulose fibers, natural fibers such as animal fibers, or the like. The cellulose-based fibers include plant fibers such as kapok and hemp, synthetic fibers such as rayon, and the like. Plant fibers are also natural fibers. The animal fiber contains wool, silk, etc. In some cases, a high-melting thermoplastic fiber having a melting point of 220 ℃ or higher, such as a polyester fiber or a polyamide fiber, is mixed in the regenerated fiber of the fabric.
The fineness of the main fibers 115 and 135 and the sub-fiber 125 is not particularly limited, and may be, for example, about 2.2dtex to 16 dtex. The lengths of the main fibers 115 and 135 and the sub-fiber 125 are not particularly limited, and are, for example, about 27mm to 76 mm. The cross-sectional shapes of the main fibers 115 and 135 and the sub-fiber 125 are not particularly limited, and may be an ellipse including a perfect circle, a triangle, a flat shape, or the like. The main fibers 115 and 135 and the sub-fiber 125 may be hollow fibers having a hollow cross section.
Of course, multiple fibers may also be combined in primary fibers 115, 135 and secondary fibers 125.
The same type of fibers may be used for the main fibers 115 and 135, or different types of fibers may be used. The secondary fibers 125 used in the case of the second fiber layer 120 may be the same type of fibers as the primary fibers 115 and 135 or different types of fibers from the primary fibers 115 and 135.
The melting point of the thermoplastic fibers 116, 126, 136 is preferably 80 ℃ to 200 ℃. In order to suppress plasticization of the thermoplastic fibers caused by temperature rise in the automobile, the melting points of the thermoplastic fibers 116, 126, 136 are more preferably 90 ℃ or higher, and still more preferably 100 ℃ or higher. In addition, in order to easily melt the thermoplastic fibers during press molding, the melting points of the thermoplastic fibers 116, 126, and 136 are more preferably 190 ℃ or less, still more preferably 180 ℃ or less, and particularly preferably 160 ℃ or less. Such low-melting thermoplastic fibers 116, 126, 136 are preferably fibers of a thermoplastic resin (containing a thermoplastic elastomer). As the thermoplastic resin, polyester resins such as polyethylene terephthalate (PET) resins, polyolefin resins such as polypropylene (PP) resins and Polyethylene (PE) resins, modified resins obtained by adding elastomers to these synthetic resins, materials obtained by adding additives such as colorants to these synthetic resins, and the like can be used. The thermoplastic fibers 116, 126, 136 may be composite fibers having a composite structure such as a core-sheath structure or a side-by-side structure. In this case, a part of the plurality of components contained in the composite fiber may be a component having a high melting point exceeding 200 ℃.
The fineness of the thermoplastic fibers 116, 126, 136 is not particularly limited, and may be, for example, about 2.2dtex to 16 dtex. The length of the thermoplastic fibers 116, 126, 136 is not particularly limited, and may be, for example, about 27mm to 76 mm. The cross-sectional shape of the thermoplastic fibers 116, 126, 136 is not particularly limited, and may be an ellipse including a perfect circle, a triangle, a flat shape, or the like. The thermoplastic fibers 116, 126, 136 may be hollow fibers having a hollow cross section.
Of course, multiple fibers may be combined in the thermoplastic fibers 116, 126, 136.
The thermoplastic fibers 116 and 136 may be the same type of fibers or different types of fibers. The thermoplastic fibers 126 of the second fibrous layer 120 may be the same type of fibers as the thermoplastic fibers 116, 136 or may be different types of fibers from the thermoplastic fibers 116, 136.
In the first fiber layer 110 and the third fiber layer 130, the blend ratio of the main fibers 115 and 135 is 60 wt% or more, and the blend ratio of the thermoplastic fibers 116 and 136 is 40 wt% or less. This is to give the muffler 1a soft touch (e.g., a pedaling property via the carpet 20) appropriately. From the viewpoint of further improving the feel of the muffler 1, it is more preferable that the blend ratio of the main fibers 115 and 135 is 65 wt% or more and the blend ratio of the thermoplastic fibers 116 and 136 is 35 wt% or less. In the fiber layers 110 and 130, the blend ratio of the main fibers 115 and 135 is 99 wt% or less, and the blend ratio of the thermoplastic fibers 116 and 136 is 1 wt% or more. This is to suppress deformation of the fiber layers 110, 130 after press forming. From the viewpoint of further favorably maintaining the shape of the fiber layers 110, 130, the blend ratio of the main fibers 115, 135 is more preferably 95 wt% or less and the blend ratio of the thermoplastic fibers 116, 136 is 5 wt% or more, the blend ratio of the main fibers 115, 135 is more preferably 90 wt% or less and the blend ratio of the thermoplastic fibers 116, 136 is 10 wt% or more, and particularly the blend ratio of the main fibers 115, 135 is 80 wt% or less and the blend ratio of the thermoplastic fibers 116, 136 is more preferably 20 wt% or more.
Of course, the mixing ratio of the main fibers 115 and the mixing ratio of the main fibers 135 may be the same or different.
In the second fiber layer 120, the blend ratio of the thermoplastic fibers 126 is 50 wt% or more, and the blend ratio of the secondary fibers 125 is 50 wt% or less. This is because the thermoplastic fibers 126 welded to each other provide the second fiber layer 120 with high rigidity, and further provide the lightweight muffler 1 with good compressive strength. From the viewpoint of further improving the rigidity of the second fiber layer 120, the blending ratio of the thermoplastic fibers 126 is more preferably 70 wt% or more and the blending ratio of the sub-fibers 125 is 30 wt% or less, still more preferably the blending ratio of the thermoplastic fibers 126 is 90 wt% or more and the blending ratio of the sub-fibers 125 is 10 wt% or less, and particularly preferably the blending ratio of the thermoplastic fibers 126 is 95 wt% or more and the blending ratio of the sub-fibers 125 is 5 wt% or less.
The third fiber layer 130 may be omitted as illustrated in fig. 4 and 5.
The silencer 1 shown in fig. 4 includes a first fibrous layer 110 formed with a first shaped face 11 facing the carpet 20, and a second fibrous layer 120 formed with a second shaped face 12 facing the body panel 80. In this case, the first molding surface 11 is a surface 10 on which the disk 500 shown in fig. 7 is placed. The second fiber layer 120 includes an adhesive surface 121 to which the first fiber layer 110 is adhered. The muffler 1 shown in fig. 4 supports the compressive load transmitted from the carpet 20 to the soft first fiber layer 110 to the high-rigidity second fiber layer 120 by supporting the second fiber layer 120 to the vehicle body panel. Therefore, the muffler 1 shown in fig. 4 has a good feeling (e.g., pedaling property) when pressed in the thickness direction, and can obtain an appropriate compressive strength even when it is reduced in weight. When the skin material (for example, the carpet 20) has air permeability to allow air to pass through in the thickness direction, sound waves enter the muffler 1 from the vehicle interior C1 through the skin material, and the muffler 1 performs a sound absorbing function. Therefore, the flow resistance value on the vehicle cabin C1 side can be controlled by the first fiber layer 110, and the sound absorption can be improved.
The muffler 1 shown in fig. 5 includes a second fibrous layer 120 formed with the second shaped surface 12 facing the carpet 20, and a first fibrous layer 110 formed with the first shaped surface 11 facing the body panel 80. In this case, the second molding surface 12 is a surface 10 on which the disk 500 shown in fig. 7 is placed. The second fiber layer 120 includes an adhesive surface 121 to which the first fiber layer 110 is adhered. The muffler 1 shown in fig. 5 has the soft first fiber layer 110 between the second fiber layer 120 and the body panel 80, whereby the compressive load transmitted from the carpet 20 to the high-rigidity second fiber layer 120 is borne over a wide range of the soft first fiber layer 110. Therefore, the muffler 1 shown in fig. 5 can obtain a more appropriate compression strength.
The muffler 1 shown in fig. 2 has the third fiber layer 130 between the second fiber layer 120 and the body panel 80 as compared with the case shown in fig. 4, whereby the compressive load transmitted from the carpet 20 to the high-rigidity second fiber layer 120 via the first fiber layer 110 is borne over a wide range of the soft third fiber layer 130. Therefore, a more appropriate compressive strength can be obtained. In addition, in the muffler 1 shown in fig. 2, compared to the case shown in fig. 5, since the fiber layers 110 and 130 are provided on both sides of the second fiber layer 120, the compressive load transmitted from the carpet 20 to the soft first fiber layer 110 is supported by the high-rigidity second fiber layer 120. Therefore, the feeling (e.g., pedaling property) when pressed in the thickness direction is good, and an appropriate compressive strength can be obtained even if the weight is reduced.
The second fiber layer 120 may be disposed on a part of the facing surface 111 of the first fiber layer 110 on the opposite side to the first molding surface 11, as illustrated in fig. 6. Fig. 6 schematically illustrates the body panel 80 side of the silencer 1 that is press-formed. A vertical section when the muffler 1 is cut at the position of A2-A2 is schematically illustrated in the lower part of fig. 6. The second fiber layer 120 has a locally different basis weight, and the second fiber layer 120 is integrated with the facing surface 111 of the first fiber layer 110 having a substantially uniform basis weight. The third fiber layer 130 has a substantially uniform weight per unit area, and is integrated with the second fiber layer 120 on the first fiber layer 110 and the facing surface 111 in the first fiber layer 110 of the fiber-free portion of the second fiber layer 120. The weight per unit area of each of the layers 110, 120, and 130 and the weight per unit area of the muffler 1 are weights per unit area of a virtual plane orthogonal to the thickness direction D3 of the muffler 1.
The second molding surface 12 formed on the third fiber layer 130 is a concave-convex surface 140. On the uneven surface 140, convex portions 141 substantially corresponding to portions of the second fiber layer 120 where fibers are present and concave portions 142 substantially corresponding to portions of the second fiber layer 120 where fibers are not present are formed. The convex portion 141 includes a high convex portion 141a and a low convex portion 141b.
In addition, silencers without third fibrous layer 130 as shown in FIG. 6 are also encompassed by the present technology.
The density of the entire muffler 1 is preferably 0.03g/cm from the viewpoint of imparting good compression strength to the muffler 3 The above is preferably 0.10g/cm from the viewpoint of appropriately imparting a soft touch to the sound absorber 3 The following.
Fig. 7 schematically illustrates a method of measuring the compression strength of the muffler 1 as the amount of recess L0. The sample SA of the muffler 1 may have an area of 200mm square or more. The indentation amount L0 is a distance by which the sample SA is indented when a load F of 50N is applied in the thickness direction D3 of the sample SA to the circular plate 500 having a diameter of 50mm placed on the surface SA1 of the sample SA by a not-shown pressurizing device. Surface SA1 corresponds to surface 10 of muffler 1 shown in fig. 2, 4, 5. The load F of 50N is a load set by assuming that it is applied to the muffler 1 from the feet of an occupant seated in a seat of the automobile.
The basis weight obtained by adding the first fiber layer 110 and the third fiber layer 130 in total is preferably 600g/m from the viewpoint of appropriately imparting a soft touch to the muffler 2 From the viewpoint of imparting good compression strength to the sound absorber, the above is preferably 1000g/m 2 The amount of the surfactant is preferably 800g/m 2 。
This specific example has a feature that the basis weight of the second fiber layer 120 is set in accordance with the thickness T0 of the muffler 1 shown in fig. 2, 4, and 5. Hereinafter, conditions of the basis weight of the second fiber layer 120 will be described with reference to fig. 8 and 9.
FIG. 8 shows that the basis weights of the fiber layers 110 and 130 are 400g/m 2 That is, the basis weight of the total of the fiber layers 110 and 130 is particularly preferably 800g/m 2 In the case of (3), a graph of the result of obtaining the recess amount L0 corresponding to the basis weight of the muffler 1 is obtained by computer simulation. The weight per unit area of the second fiber layer 120 is Y (g/m) 2 ) The weight per unit area Y is obtained by subtracting 800g/m from the weight per unit area of the muffler 1 2 The latter value. Here, the blend ratio of the main fibers 115 and 135 in the fiber layers 110 and 130 is particularly preferably set to 70% by weight, and the blend ratio of the thermoplastic fibers 126 in the second fiber layer 120 is particularly preferably set to 100% by weight. In FIG. 8, the horizontal axis represents the weight per unit area (g/m) of the muffler 1 2 ) The vertical axis represents the depression amount L0 (mm). The 10 curves shown in fig. 8 show the correspondence in the case where the thickness T0 (unit: mm) of the muffler 1 is changed to 10, 15, 20, 25, 30, 35, 40, 45, 50, and 60 in order from the lowermost to the uppermost.
Here, when the indentation amount L0 when a load F of 50N is applied in the thickness direction D3 to the disc 500 having a diameter of 50mm placed on the first molded surface 11 of the muffler 1 is 15mm or less, an appropriate compressive strength can be obtained. Therefore, the thickness T0 of the muffler itself is preferably 20mm or more. In each curve having a thickness T0 of 20 to 60mm, the basis weight Y at which the depression amount L0 becomes 15mm is the minimum basis weight required for the second fiber layer 120.
Fig. 9 shows a graph of the correspondence relationship CO1, CO2 between the thickness T0 of the muffler 1 and the weight Y per unit area of the second fiber layer 120. In FIG. 9, the horizontal axis represents the thickness T0 (mm) of the muffler, and the vertical axis represents the weight per unit area Y (g/m) of the second fiber layer 2 ). The correspondence CO1 shown in fig. 9 represents the minimum basis weight obtained from the curve having the thickness T0 of 20 to 60mm in fig. 8, in which the indentation amount L0 is the basis weight Y of 15 mm. The correspondence CO2 shown in fig. 9 indicates the minimum basis weight obtained from the basis weight Y of 15mm, which is the depression amount L0 when the material of the second fiber layer 120 is replaced with the material of the fiber layers 110 and 130. The thickness T0 of the muffler 1 is X (mm), and the basis weight of the second fiber layer 120 is Y (g/m) 2 ) The correspondence CO1 is represented by formula (1).
Y＝1.068·X 2 -23.12·X+176.4…(1)
The correspondence CO2 is expressed by formula (2).
Y＝1.755·X 2 -24.97·X-48.35…(2)
According to the correspondence CO1 shown in FIG. 9, the weight per unit area Y of the second fiber layer 120 at the density of the muffler 1 is 0.10g/cm 3 In the following range, formula (3) is preferable.
Y≥1.068·X 2 -23.12·X+176.4…(3)
The density of the silencer 1 was 0.10g/cm 3 Hereinafter, the basis weight Y of the second fiber layer is limited, but the basis weight Y of the second fiber layer is preferably expressed by equation (4) from the correspondence relationship CO2 shown in fig. 9.
Y＜1.755·X 2 -24.97·X-48.35…(4)
Actually, the density of the sample SA of the silencer 1 was 0.10g/cm by using the cloth regenerated fiber for the main fibers 115 and 135 and the PET resin fiber having the melting point of 100 to 120 ℃ for the thermoplastic fibers 116, 126 and 136 3 In the following, the sample SA was tried so that the thickness X of the sample SA and the weight Y per unit area of the second fiber layer 120 do not satisfy the inequality (3). The obtained sample SA had a dent amount L0 of 15mm or less and had a moderate compressive strength. In addition, even in the absence of the third fiber layer 130, a sample SA with an appropriate compressive strength L0. Ltoreq.15 mm can be produced. Furthermore, even if a composite fiber of a PE resin having a core part of a PET resin and a sheath part of a melting point of 130 to 140 ℃ is used as the thermoplastic fiber 116, 126, 136, the secondary fiber 125 is added to the second fiber layer 120 in a range of 50 wt% or less, the primary fiber 115, 135 of the fiber layer 110, 130 is changed in a range of 60 wt% to 99 wt%, or 600 to 1000g/m is used 2 By changing the weight per unit area obtained by summing the fiber layers 110 and 130 within the above range, a sample SA having an appropriate compressive strength and L0. Ltoreq.15 mm can be produced.
In addition, the weight per unit area of the entire silencer 1 is Ya (g/m) 2 ) Since the basis weight of the fiber layers 110 and 130 is added to the basis weight Y of the second fiber layer 120, the formula (5) is preferable.
Ya≥1.068·X 2 -23.12·X+976.4…(5)
Further, the density of the muffler 1 was 0.10g/cm 3 Hereinafter, the weight Ya per unit area is limited, but the formula (6) is preferable.
Y＜1.755·X 2 -24.97·X+751.7…(6)
(3) Specific examples of the method for manufacturing a muffler for an automobile:
fig. 10 schematically shows an example of a muffler manufacturing apparatus for manufacturing the muffler 1 for an automobile. A plan view of the muffler manufacturing apparatus 400 viewed from above is illustrated in the upper part of fig. 10. Fig. 11 schematically illustrates a vertical end face of the press-forming machine 200.
The muffler manufacturing apparatus 400 shown in fig. 10 includes a first fiber supply unit 410 that sends out the fiber F1 downward, a second fiber supply unit 420 that sends out the fiber F2 downward, a third fiber supply unit 430 that sends out the fiber F3 downward, a conveyor 440, a control unit 450, and the press-forming machine 200. Here, the fiber F1 becomes the fiber 114 of the first fiber layer 110, the fiber F2 becomes the fiber 124 of the second fiber layer 120, and the fiber F3 becomes the fiber 134 of the third fiber layer 130. In the case of forming the muffler 1 without the third fiber layer 130, the third fiber supply part 430 may be omitted.
The first fiber supply unit 410 forms the first supplied fiber layer 310 by defibering and mixing the raw fibers for the fibers F1 and supplying the fibers F1 to the conveyor 440 moving in the moving direction D4 so that the thickness and the basis weight are substantially constant. Therefore, the first fiber supplying step S1 is mainly performed by the first fiber supplying unit 410 and the conveyor 440. The first ply of feed fibers 310 becomes the first fiber ply 110 having the generally planar first forming surface 11.
The second fiber supply unit 420 arranged downstream of the first fiber supply unit 410 in the moving direction D4 forms the second feed fiber layer 320 by defibering and mixing the raw fibers for the fibers F2 and supplying the fibers F2 onto the first feed fiber layer 310 moving in the moving direction D4 so that the thickness and the basis weight are locally different. Therefore, the second fiber supplying step S2 is mainly performed by the second fiber supplying section 420 and the conveyor 440. The second feed fiber layer 320 becomes the second fiber layer 120 having the adhesive surface 121. The second fiber supply section 420 shown in fig. 10 includes a plurality of divided fiber supply sections 425 having different fiber F2 supply positions in the width direction D5 of the conveyor 440. In fig. 10, the second fiber supply part 420 is shown as being divided into divided fiber supply parts # 1 to #10, but the number of the divided fiber supply parts 425 provided in the second fiber supply part 420 is not limited to 10. Each of the divided fiber supply parts 425 has a function of measuring the fiber F2. The fibers F2 can be deposited by the respective divided fiber supply portions 425 in an arbitrary amount at an arbitrary position on the upper surface of the first supply fiber layer 310 conveyed by the conveyor 440.
The third fiber supplying section 430 arranged downstream of the second fiber supplying section 420 in the moving direction D4 unwinds and mixes the raw fibers for the fibers F3, and supplies the fibers F3 to the fiber supplying layers 310 and 320 moving in the moving direction D4 so that the thickness and the basis weight are substantially constant, thereby forming the third fiber supplying layer 330. That is, the fibers F3 are stacked on the second feed fiber layer 320 and the first feed fiber layer 310 of the second feed fiber layer 320, which is free of the fibers F2. Therefore, the third fiber supplying step S3 is mainly performed by the third fiber supplying unit 430 and the conveyor 440. The third feeding fiber layer 330 becomes a third fiber layer 130 having a second shaped face 12.
The conveyor 440 places the fiber aggregate 300 including the supply fiber layers 310, 320, and 330 and transfers the fiber aggregate in the moving direction D4. The conveyor 440 may use a belt conveyor or the like. When a plurality of air holes are formed in the belt of the belt conveyor, the fiber aggregate 300 is preferably preheated to a temperature slightly higher than the melting point of the thermoplastic fibers 116, 126, 136 by hot air heating or the like.
The control unit 450 controls the moving speed V1 of the conveyor 440, the feeding speeds of the fibers F1 and F3 from the fiber feeding units 410 and 430, the feeding speed V2 of the fiber F2 from each divided fiber feeding unit 425, and the like. In particular, the control unit 450 controls the supply of the fibers F2 only to a predetermined region on the first fiber supply layer 310, and also controls the supply amount of the fibers F2 in the region where the fibers F2 are supplied. The control unit 450 variably controls the basis weight of the fiber F2 supplied from the divided fiber supply unit 425 onto the first supplying fiber layer 310 in units of the divided fiber supply unit 425 in accordance with the procedure constituting the control program.
The fiber assembly 300 formed through the fiber supply steps S1, S2, and S3 is carried into the press-forming machine 200 and press-formed (forming step S5). Before the forming step S5, the fiber assembly 300 may be preheated (preheating step S4). In the preliminary heating step S4, the fiber assembly 300 may be carried into a heater such as a suction heater (hot air circulation heater) and preliminarily heated to a temperature slightly higher than the melting point of the thermoplastic fibers 116, 126, and 136 by hot air heating or the like. In order to increase the amount of heat at the time of preliminary heating, radiation heating by an infrared heater may be performed simultaneously in addition to heating by a suction heater. Of course, heating without using a suction heater may also be performed. In the preliminary heating step S4, a preform may be formed by preliminary molding in accordance with the shape of the muffler 1.
The fibrous assembly 300 in the form of a felt or a preform is carried into a press-molding machine 200 as illustrated in fig. 11. In the press-forming machine 200 shown in fig. 11, an upper die 212 and a lower die 214 constituting a press-forming die 210 are provided so as to be able to approach or separate from each other. The upper die 212 is a die having a die surface 213 on the opposite surface thereof, the die surface being adapted to the shape of the body panel 80 side of the muffler 1. The lower mold 214 is a mold having a mold surface 215 on the opposite surface thereof, the mold surface matching the shape of the carpet 20 side of the muffler 1. The press forming is preferably a hot press with heating, but may be a cold press without heating.
The fiber assembly 300 is arranged on the lower die 214 (press forming step P1), and when the dies 212 and 214 approach each other, the muffler 1 before trimming is press formed (press forming step P2). Thus, the first fiber layer 110 is formed of the first supplying fiber layer 310, the second fiber layer 120 is formed of the second supplying fiber layer 320, and the third fiber layer 130 is formed of the third supplying fiber layer 330 in the case where the fiber assembly 300 has the third supplying fiber layer 330. A first forming surface 11 is formed on the first fibrous layer 110. The second fiber layer 120 is integral with the first fiber layer 110, and the second fiber layer 120 is integral with the third fiber layer 130 in the presence of the third feed fiber layer 330. In the presence of the third feeding fiber layer 330, the second shaped face 12 is formed in the third fiber layer 130. In the absence of the third feeding fiber layer 330, the second molding surface 12 is formed on the fiber-free portion of the second fiber layer 120 in the second fiber layer 120 and the first fiber layer 110.
The muffler 1 before trimming is taken out from the press-forming machine 200 after cooling and carried into the outer periphery cutting machine to be cut into the outer periphery. The cutting method may be cutting with a cutting knife, water-jet cutting, or hand cutting using a cutter. Further, a hole penetrating in the thickness direction D3 may be formed in the muffler 1 as necessary.
(4) Specific examples of the function and effect of the muffler for an automobile:
as described above, by including 50 wt% or more of the thermoplastic fibers 126 in the second fiber layer 120 formed by press forming, the thermoplastic fibers 126 welded to each other impart high rigidity to the second fiber layer 120. This is presumed to be that the compressive strength of the muffler 1 can be maintained even if the muffler 1 is made lightweight. In addition, by incorporating 60 wt% or more of the main fibers 115 and 135 containing a non-molten component into the fiber layers 110 and 130 formed by press forming, flexibility is imparted to the fiber layers 110 and 130. This is presumed to improve the tactile sensation of the muffler 1. The shape of the fiber layers 110 and 130 is maintained by including the thermoplastic fibers 116 and 136 in an amount of 1 wt% or more in the fiber layers 110 and 130 formed by press forming.
In the silencer 1 of this specific example, the second fiber layer 120 obtained by increasing the weight ratio of the thermoplastic fibers is combined with the fiber layers 110 and 130 containing a large amount of the main fibers 115 and 135 containing a non-molten component, whereby an appropriate compressive strength can be obtained even if the weight is reduced. This is presumed to be because, in the muffler 1 formed by press molding, the appropriate rigidity of the second fiber layer 120 is combined with the soft touch of the fiber layers 110 and 130, and thereby an appropriate compressive strength can be obtained even when the weight is reduced.
Moreover, the muffler 1 has the following features: a second fiber layer 120 obtained by combining the fiber layers 110 and 130 in such a manner that the weight ratio of the thermoplastic fibers is increased, the thickness Xmm of the muffler 1, and the weight Yg/m per unit area of the second fiber layer 120 2 Satisfies the relation of the inequality (3), and the recess L0 is 15mm or less. As described above, the thermoplastic fibers 126 of the second fiber layer 120 are formed by press forming in a large weight ratio, and the weight Y per unit area of the second fiber layer 120 is not less than 1.068. X 2 23.12 · X +176.4, whereby the mutually fused thermoplastic fibers 126 impart a high stiffness to the second fiber layer 120. This is presumed to be maintained even if the muffler 1 is made lightweightCompressive strength of the muffler 1. In addition, the fiber layers 110 and 130 formed by press forming have a small weight ratio of the thermoplastic fibers 116, thereby imparting flexibility to the fiber layers 110 and 130. This is presumed to improve the tactile sensation of the muffler 1. Further, since the recess L0 of the muffler 1 is 15mm or less, the feel of the muffler 1 is further improved.
According to the above feature, the muffler 1 has a density of 0.10g/cm 3 The following also have appropriate compressive strength. Therefore, the muffler 1 of the present specific example can obtain an appropriate compression strength even with a reduced weight.
In the muffler 1 having the above-described characteristics, the thermoplastic fibers 126 may be contained in the second fiber layer 120 in a weight ratio higher than the weight ratio of the thermoplastic fibers 116 contained in the first fiber layer 110. Thus, in a muffler 1 having the above-described features, the thermoplastic fibers 116, 136 of the fibrous layers 110, 130 may be more than 40 wt%, and the thermoplastic fibers 126 of the second fibrous layer 120 may be less than 50 wt%.
(5) Modification example:
various modifications of the present invention are conceivable.
For example, the muffler for a motor vehicle to which the present invention is applicable may be a muffler for a trunk, a muffler for a door, a muffler for a ceiling, a muffler for an instrument panel, a muffler for an engine, a muffler for a fender, and the like, in addition to a floor muffler for a vehicle cabin.
(6) To summarize:
as described above, according to the present invention, it is possible to provide a technique such as a muffler for an automobile, which can obtain an appropriate compression strength even when the weight is reduced, by various means. Of course, even a technique including only the constituent elements of the independent technical means can obtain the basic operation and effect described above.
Further, a structure obtained by replacing or changing and combining the respective structures disclosed in the above examples, a structure obtained by replacing or changing and combining the respective structures disclosed in the known art and the above examples, and the like may be implemented.
Description of reference numerals:
1 \8230, a silencer 10 \8230, a surface 11 \8230, a first forming surface 12 \8230, a second forming surface,
20, 823080, carpet (skin material), 80, 8230and body panel,
110, 114, 8230, 115, 8230, main fibers 116, 8230, thermoplastic fibers,
120, 8230, a second fibrous layer, 124, 8230, fibers 125, 8230, secondary fibers 126, 8230, thermoplastic fibers,
130, 8230, a third fiber layer, 134, 8230, fibers, 135, 8230, main fibers, 136, 8230, thermoplastic fibers,
500, 8230, a circular plate,
d3, 8230and in the thickness direction,
l0 of 823070, a dishing amount,
t0 \8230andthickness of silencer.
Claims (3)
1. A silencer is a stamping silencer for motor vehicles, wherein,
the muffler includes:
a first fiber layer containing 60 to 99 wt% of a main fiber containing a non-molten component and 1 to 40 wt% of a thermoplastic fiber; and
a second fiber layer containing 50 to 100 wt% of thermoplastic fibers,
the thickness of the silencer is more than 20mm,
the density of the silencer is 0.10g/cm 3 In the following, the following description is given,
the thickness of the silencer is set to Xmm, and the unit area weight of the second fiber layer is set to Yg/m 2 When the weight Y per unit area is not less than 1.068. X 2 -23.12·X+176.4，
When a load of 50N is applied in the thickness direction of the silencer to a circular plate with a diameter of 50mm placed on the surface of the silencer, the distance of the silencer recess is 15mm or less.
2. The muffler according to claim 1,
the silencer further comprises a third fiber layer containing 60 to 99 wt% of main fibers containing a non-molten component and 1 to 40 wt% of thermoplastic fibers,
the second fibrous layer is located between the first fibrous layer and the third fibrous layer.
3. A silencer, which is a stamping silencer for motor vehicles, wherein,
the muffler includes: a first fibrous layer comprising thermoplastic fibers; and a second fiber layer containing thermoplastic fibers in a weight ratio higher than that of the thermoplastic fibers contained in the first fiber layer,
the thickness of the silencer is more than 20mm,
the density of the silencer is 0.10g/cm 3 In the following, the following description is given,
the thickness of the silencer is set to Xmm, and the unit area weight of the second fiber layer is set to Yg/m 2 When the weight Y per unit area is not less than 1.068. X 2 -23.12·X+176.4，
When a load of 50N is applied in the thickness direction of the silencer to a circular plate with a diameter of 50mm placed on the surface of the silencer, the distance of the silencer recess is 15mm or less.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019059636 | 2019-03-27 | ||
| JP2019-059636 | 2019-03-27 | ||
| PCT/JP2020/005058 WO2020195244A1 (en) | 2019-03-27 | 2020-02-10 | Silencer for automobiles |
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| CN113286699A CN113286699A (en) | 2021-08-20 |
| CN113286699B true CN113286699B (en) | 2023-02-21 |
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| Country | Link |
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| JP (1) | JP7135201B2 (en) |
| CN (1) | CN113286699B (en) |
| WO (1) | WO2020195244A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5817408A (en) * | 1996-09-25 | 1998-10-06 | Nissan Motor Co., Ltd. | Sound insulation structure |
| CN102965847A (en) * | 2012-11-22 | 2013-03-13 | 芜湖跃飞新型吸音材料股份有限公司 | PET (polyethylene glycol terephthalate) fiber/polyacrylonitrile fiber composite sound absorbing cotton and preparation method of PET fiber/polyacrylonitrile fiber composite sound absorbing cotton |
| JP2013163869A (en) * | 2012-02-09 | 2013-08-22 | Asahi Kasei Fibers Corp | Molded acoustic material for dash silencer of vehicle |
| CN105383409A (en) * | 2014-09-03 | 2016-03-09 | 丰和纤维工业株式会社 | Soundproof body for motor vehicles and silencer for motor vehicles |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4919881B2 (en) * | 2007-06-20 | 2012-04-18 | 旭化成せんい株式会社 | Composite sound-absorbing material |
| WO2015146428A1 (en) * | 2014-03-25 | 2015-10-01 | 林テレンプ株式会社 | Automobile silencer |
| JP6430284B2 (en) * | 2015-02-25 | 2018-11-28 | 林テレンプ株式会社 | Silencer for automobile and manufacturing method thereof |
-
2020
- 2020-02-10 JP JP2021508208A patent/JP7135201B2/en active Active
- 2020-02-10 WO PCT/JP2020/005058 patent/WO2020195244A1/en active Application Filing
- 2020-02-10 CN CN202080008472.5A patent/CN113286699B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5817408A (en) * | 1996-09-25 | 1998-10-06 | Nissan Motor Co., Ltd. | Sound insulation structure |
| JP2013163869A (en) * | 2012-02-09 | 2013-08-22 | Asahi Kasei Fibers Corp | Molded acoustic material for dash silencer of vehicle |
| CN102965847A (en) * | 2012-11-22 | 2013-03-13 | 芜湖跃飞新型吸音材料股份有限公司 | PET (polyethylene glycol terephthalate) fiber/polyacrylonitrile fiber composite sound absorbing cotton and preparation method of PET fiber/polyacrylonitrile fiber composite sound absorbing cotton |
| CN105383409A (en) * | 2014-09-03 | 2016-03-09 | 丰和纤维工业株式会社 | Soundproof body for motor vehicles and silencer for motor vehicles |
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| JP7135201B2 (en) | 2022-09-12 |
| CN113286699A (en) | 2021-08-20 |
| JPWO2020195244A1 (en) | 2021-10-28 |
| WO2020195244A1 (en) | 2020-10-01 |
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