JP2000110682A - Noise absorbing member mounting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and positively mount the structure of an noise absorbing member in the inside of a box shaped body such as an air cleaner and the like without using any complex pressing plate. SOLUTION: The plural number of noise absorbing bodies 15a in which each porous absorbing material such as non-woven fabric, glass wool, foamed resin and the like is formed into a block shape, are disposed at specified intervals, and each absorbing body 15a is enclosed with a skin body 15b thin in thickness, and made out of non- woven fabric so as to allow each fused flange part 15c in a specified width to be formed up around each absorbing body 15a. A fixing through hole is provided for the specified position of each flange part 15c, a washer 16 is disposed over to each through hole so as to be fixed thereto, each absorbing body 15a is provided so as to be adhered to the inner surfaces of three directional walls with exception of the top of a bottom wall for a body 11 and an entrance pipe 11a, and the through hole of each flange part 15c is allowed to coincide with each mounting hole over the wall surface of the body 11. Each inhibiting fixture F formed out of a fastening top 18 having split leg pieces 18b, and of a push pin 17, is inserted in the through holes from the outside so as to allow each absorbing member 15 to be firmly fixed to the inner surface of the body using each push pin 17 and the split leg pieces 18b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting device for mounting a sound absorbing member on the inner surface of a synthetic resin box, such as an air cleaner for an engine.

[0002]

2. Description of the Related Art Although an air cleaner used for an engine of a vehicle or the like has a function of a resonance type silencer itself,
In order to more effectively reduce the noise of the intake system, a sound absorbing material such as nonwoven fabric, glass wool, rock wool, or foamed resin is arranged inside the body of the air cleaner.

[0003] One example is shown in Fig. 9 and Fig. 10. An air cleaner A is made of a synthetic resin such as nylon or polypropylene and has a stepped rectangular box-shaped body 1 provided with an inlet pipe 1a on one side. A rectangular block-shaped filter element 3 made of pleated filter paper fitted on the stepped portion, and a box made of the same synthetic resin as the body 1 and fixed to the body 1 at a plurality of locations around the body 1 with clip fittings 4. A cover 2 (having an outlet pipe 2a in the direction perpendicular to the paper) has a sound absorbing material 5 formed of a mat-like material made of the above-mentioned material in the lower half of the body 1. Are arranged so as not to be blocked, and on the sound absorbing material 5, an iron holding plate 6 formed in a lattice-like basket shape by vertical and horizontal strips 6a and 6b is placed. The bent part at both ends of the edge of the sound absorbing material 5 On the other hand, flanges provided at both ends of each of the horizontal pieces 6b are riveted to the side wall of the body 1 as shown in FIG. 11 so that the sound absorbing material 5 does not move due to vibration of the engine or shaking of the vehicle body. ing.

Recently, various noises such as mechanical vibration noise, impact noise, combustion noise, pulsation noise, etc. radiated from the engine E by fitting the noise reduction cover C of the engine E as shown in FIG. It is attenuated so that it is not released to the outside as it is.

FIG. 13 shows a muffler cover C, which is formed in a box shape from a synthetic resin such as nylon or polypropylene, and is fixed to a bracket of an engine by flanges Cb provided outside each corner. As shown in FIG. 14, tenon-shaped projections Ca are provided at required locations on the inner surface.
The sound absorbing material 5 is fixed to the inner surface of the cover C by fitting the through holes 5a provided so as to correspond to the projections Ca, and fitting the dish-shaped push nuts 9 into their protruding ends. .

The push nut 9 is made of a spring steel plate and has an annular dish-like shape having a center hole 9c fitted into the projection Ca of the cover C as shown in FIG. The part is inclined so that the part is low and the surrounding part is high, and the periphery is bent downward to have rigidity.
It is divided into a plurality of elastic sector pieces 9a by several slits 9b extending from c to the periphery.

[0007]

The former, in which a sound absorbing material is mounted in a body forming a deep box-like body of an air cleaner, requires a lattice-shaped cage-shaped pressing plate formed by pressing a thin iron plate. It is easy to cause springback phenomenon after processing, the hole of the body for riveting often does not match the hole of the plate end, and the rivet must be caulked inside the body, assembling It takes time to work,
Further, the cage-shaped holding plate has a problem that a certain clearance for suppressing the sound absorbing material from the body must be formed all around.

On the other hand, in the latter case in which the adsorbent is attached to an engine cover having a thin box-like body, the inner diameter of the center hole of the push nut is formed slightly smaller than the outer diameter of the cover projection, and the center hole is formed in the projection. The sound-absorbing material is suppressed by the elastic force caused by pushing and bending deformation of the sector piece. This is easier to install than the former, but the base (peripheral part) of the sector divided by the slit is hard and often Then, as shown by the dotted line in FIG. 14, the inner end of the fan-shaped piece is hooked on the tip of the projection, so that the push nut is not fitted well, and the suppression of the sound absorbing material becomes insufficient. The projection provided on the cover body cannot be provided on the side wall of the box-shaped body due to the molding process of synthetic resin (due to the removal of the male mold from the female mold), and when the cover body is deep like the body of the air cleaner. However, there is a problem that the mounting of the sound absorbing material is limited to the ceiling wall (or the bottom wall) and cannot be mounted on the side wall.

In view of the above, the present invention does not require a cage-shaped holding plate as in the prior art when mounting the adsorbent.
A sound absorbing material can be reliably and easily mounted on the inner surface of a box-shaped body, and can be efficiently mounted not only on the bottom wall or the ceiling wall of the box-shaped body but also on the inner surface of a side wall to improve the sound absorbing effect. And

[0010]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention firstly provides a porous sound absorbing device as a device for mounting a sound absorbing member inside a wall of a box-like body made of a synthetic resin such as an air cleaner body. A sound absorbing member is formed by forming a similarly porous flange portion around the sound absorbing body made of a substance to form a sound absorbing member, and a through hole is provided at a predetermined position of the surrounding flange portion, and formed on the wall of the synthetic resin box-shaped body. Washers are respectively arranged on the through holes of the sound absorbing member corresponding to the provided mounting holes, and the mounting holes in the side wall of the box-shaped body and the through holes of the sound absorbing member aligned with the holes have a flange having an inner hole. A stopper formed by a stop piece consisting of a split leg piece extending forward from the inner hole, a push pin consisting of a rod having a truncated conical portion for expanding the leg piece and a collar closely contacting the inner hole of the stop piece flange. Through the outside from each other, and attach the sound absorbing member Secondly, it is characterized in that it is fixed to the inside of the fixed wall, and secondly, a porous portion having a predetermined width is formed around a sound absorbing body made of a porous sound absorbing material to form a sound absorbing member, and the surrounding sound absorbing member is formed. A through hole is provided at a predetermined position of the flange portion, and a washer is disposed on each of the through holes of the sound absorbing member corresponding to the mounting holes provided on the side wall of the box body made of synthetic resin. The mounting hole and the through hole of the sound absorbing member aligned with the mounting hole include a stopper having a flange having an inner hole and a split leg piece extending forward from the inner hole, and a rod having a truncated conical portion for expanding the leg piece. A stopper formed by a push pin made of a brim that is in close contact with the inner hole of the retaining piece brim is inserted from the outside to fix the suction member, while a tenon-shaped protrusion is provided at a predetermined position on the bottom wall of the box-shaped body. Parts, and the protrusions have through holes in the flange part of the suction member. Is characterized in that fastening the sound-absorbing member is fitted a push nut having a plurality of fan-shaped pieces together the flexibility imparted to the root portion mated respectively.

[0011]

FIG. 1 shows an example in which the present invention is applied to an air cleaner for an engine. An air cleaner A is made of a synthetic resin such as nylon or polypropylene and has an air inlet pipe 11a on one side. A stepped square box-shaped body 11, a square block-shaped filter element 13 made of pleated filter paper fitted and arranged in the step,
An outlet pipe 12a is provided on one side wall of the body 1 at a plurality of places.
A cover 12 (but one side may be attached to the body by a hinge) adapted to be fixed to the body 1 by a clip 14 is provided in the lower half of the body 11 as described below. The sound absorbing member 15 is an inlet pipe 11a.
Are provided so as not to block the inner surface of the side wall provided with the fins, and are hermetically secured to the body 11 by a deterrent member F as described below at required positions on the bottom wall and the three side walls.

FIG. 2 shows a plane in which the sound absorbing member 15 is developed, and FIG. 3 shows a cross section taken along line XX of FIG. 2. The sound absorbing member 15 is made of non-woven fabric, glass wool, rock wool or foamed resin. A plurality of sound absorbers 15a formed in a block shape having a size corresponding to the positions of the bottom wall and the three side walls of the porous sound absorbing material such as the above, and a synthetic fiber covering the entire body. And a porous thin skin 15b made of a non-woven cloth.
5c, and is disposed on the front, rear, and one side (left in FIG. 2) with respect to the bottom wall, and the width of the three flange portions 15c around the sound absorbing body 15a with respect to the bottom wall is the same as that of the other portions. It is doubled and bendable.

The sound absorbing member 15 is made as follows. First, placing the skin material 15b made on the upper side on the lower mold D ₁ forming a recess Da to accommodate a plurality of block-shaped sound absorbing member 15a to a predetermined state as shown in FIG. 4 (a), the
A first upper mold D having a protrusion Db corresponding to the recess Da
The _2, and with the form and push the skin material 15b in a recess Da of the lower mold D _1, then the block in the recess Da of the lower mold D ₁ which is lined with skin member 15b as shown in FIG. 4 (b) Skin body 1 accommodating each of the sound absorbers 15a and having a lower side thereon
Place 5b, pressed against the second upper die D ₃ a lower die Da having a projection Dc which is adapted only be heated pressing vital flange portion 15c, the upper mold portion the upper and lower skin member 15b are overlapped And a lower mold projection, and is heated and welded to form a flange 15c having a predetermined width, and the flange 15c forms the sound absorbing member 15 in which the adsorbent 15a is sealed.

Further, the flange portion 1 around each sound absorbing body 15a
5c, a through hole 15d is formed by a punching press at a position corresponding to a mounting hole provided on the bottom wall or side wall of the body 11, and a through hole 15d made of iron or resin or the like is also provided thereon. The washers 16 are respectively arranged and bonded.

FIGS. 5 (a) and 5 (b) show the stopper F separately, which comprises a push pin 17 and a stop piece 18, and the push pin 17 has a pointed end at the front end (right end in the figure). Head 1
7e, a first truncated cone-shaped portion 17b at the center, a second truncated cone-shaped portion 17c narrow at the rear, and a brim 17d at the rear end (left end in the figure). Are connected back and forth by a cross-shaped rod portion 17a as shown in FIG. On the other hand, the stop piece 18 is a push pin 17
And has a rear end flange 18a and a split leg 18b shaped like a letter extending to the side extending from the inner hole 18c of the brim to the front side. When inserting the push pin 17 into the stop piece 18 with a size that allows the plate piece 17e and the brim 17d to enter and a depth about twice the thickness of the brim 17d, the cross-shaped rod portion 17a is divided. It is to be inserted between the leg pieces 18b.

In mounting the sound absorbing member 15 in the lower half of the body 11 of the air cleaner A,
The central sound absorber 15a is arranged on the bottom wall of the body, and the front and rear sound absorbers 15a are arranged along three side walls without the inlet pipe 11a, and the flanges 15c around them are arranged.
The holes 17d of the through holes 15d and the holes of the washers 16 are respectively aligned with the mounting holes provided in the body, and the push pin 17 is fitted into the inner hole 18c of the stopper piece 18 of the restraining tool F. 18 so as to be inserted between the divided leg pieces 18c, and as shown in FIG.
Is positioned on the front half of the push pin 17, and the two are combined, and the pin rod portion 17a and the split leg piece 18b in the united state are fitted from outside to the holes of the body wall, the sound absorbing member, and the washer. The sound absorbing members 15 are temporarily fixed to the body 11 by the restraining members F by inserting the respective members.

Thereafter, each push pin 17 is pushed in, and the outer surface of the collar 17a is fixed to the collar 18 of the stop piece 18.
6 (b), the split leg piece 18b of the stop piece 18 is pushed outward by the first truncated conical portion 17b of the pin 17 as shown in FIG. The second frusto-conical portion 17c is retained in a state in which the split leg piece 18b is opened inside the base portion of the leg piece, and is engaged with the annular groove on the first frusto-conical portion 17b. The back surface of the bent portion is pressed against the edge of the through hole of the washer 16, and the sound absorbing member 1 is pressed.
The fifth flange portions 15c are fixed to the body wall surfaces in a compressed state.

Thus, by the operation of the engine, outside air is taken into the body 11 from the inlet pipe 11a, purified across the filter element 13, and supplied to the engine through the outlet pipe 12a provided in the cover 12. However, in the process, noise such as air flow noise due to turbulence of air flow and pulsation noise due to opening / closing of the valve body is reduced by the air cleaner itself and at the same time appropriately attenuated by the sound absorbing member 15 in the body 11. Is done. And the collar 17d of the push pin 17
Is pushed further strongly, as shown in FIG.
The leading end of b is disengaged from the annular groove of the first truncated conical portion 17b, enters the space between the first and second truncated conical portions 17b and 17c, and the leg piece 18b is substantially horizontal, thereby suppressing The tool F can be pulled out from the mounting hole, and the sound absorbing member 15 can be replaced.

FIG. 7 shows that the sound absorbing member 15 is mounted inside the synthetic resin box-shaped sound deadening cover C fitted on the engine by the above-mentioned restraining device F so as to attenuate various noises emitted from the engine. In this case, a porous skin 1 is provided on all sides of one block-shaped adsorbent 15a.
A flange portion 15c made of 5b is formed, and the corner portion of the flange portion 15c is fastened by the stopper F.

In the above example, the body 11 of the air cleaner is used.
In the case of a deep box-shaped body as shown in FIG. 1, the mounting of the sound absorbing member 15 is such that the sound absorbing member 15 is fastened to all parts including the bottom wall and the side wall with the stopper F composed of the push pin 17 and the stopper piece 18. However, in the bottom wall portion of the deep box-shaped body, not a mounting hole but a tenon-shaped projection as shown in FIG. Are provided with only the through holes 15d without attaching the washers 16 to the positions corresponding to the through holes 15d.
Are fitted to the respective projecting portions, and holes, slits, and the like of required sizes are provided at the protruding ends of the push nuts made of spring steel plate or synthetic resin as shown in FIG. Each of the bases may be fastened with a push nut having flexibility.

In the above example, the sound absorbing member 15 is formed by covering the block-shaped sound absorbing body 15a made of the above sound absorbing substance with a porous thin skin 15b to facilitate the formation of the flange portion 15c. Although shown, the sound absorbing body 15a itself may be formed into a mat shape having a flange portion 15c of a predetermined width around by a press machine or a molding machine as shown in FIG. 8 without using the skin body 15b. The present invention can also be applied to a deep box-shaped resonator arranged in the intake system of the engine.

[0022]

According to the present invention, there is provided a mounting device for mounting a sound absorbing member inside a wall surface of a box-shaped body made of a synthetic resin such as a body of an air cleaner as in claims 1 and 2. Because it does not require an iron cage-shaped holding plate with a complicated structure, the sound absorbing function of the sound absorbing member can be improved by that much, and since the flange portion of the sound absorbing member can be expanded and contracted, Even if the through hole provided in the flange and the mounting hole on the wall of the box-shaped body are slightly displaced, the through hole can be easily aligned with the mounting hole, and the insertion of the suppressor is easy. It consists of a stop piece with an expandable split leg and a push pin with a truncated cone for pushing and opening the leg piece.The split leg piece and push pin of the stop piece are attached to the mounting hole from the outside of the wall. Simply insert the sound absorbing member to the wall securely In addition, compared to the conventional one in which the sound absorbing member is attached using the conventional push nut, there is no problem in fitting the detent or the push nut, and not only on the bottom wall of the box-shaped body but also on the side wall The sound absorbing member can be easily and securely fastened, and has advantages such as good workability.

[Brief description of the drawings]

FIG. 1 is a sectional view of an example in which the present invention is applied to an air cleaner.

FIG. 2 is a developed plan view of the sound absorbing member in FIG.

FIG. 3 is a sectional view taken along line XX of FIG. 2;

FIG. 4 (a) is an explanatory view of a first step of producing the sound absorbing member of FIG. 2; (b) is an explanatory view of the second step.

FIG. 5 (a) is a side view of a push pin of the restraining device. (b) A sectional view of the stop piece. (c) The sectional view along the line YY of figure (a).

FIG. 6 is a partial cross-sectional view showing a state where the sound absorbing member is mounted on a body wall surface.

FIG. 7 is a sectional view of an example in which the present invention is applied to a sound deadening cover of an engine.

FIG. 8 is a sectional view corresponding to FIG. 2 of a modification of the sound absorbing member.

FIG. 9 is a sectional view of a conventional air cleaner to which a sound absorbing material is attached.

FIG. 10 is a perspective view in which a part of the body is cut away.

FIG. 11 is a partial cross-sectional view showing a fixed state of a holding plate.

FIG. 12 is a perspective view showing a state in which a muffler cover is applied to an engine of the vehicle.

FIG. 13 is a perspective view of a state in which the muffling cover is turned upside down.

FIG. 14 is a sectional view taken along the line ZZ in FIG. 13;

FIG. 15 is a perspective view of the push nut.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Body 12 Cover 3 Filtration element 15 Sound absorbing member 15a Sound absorbing body 15b Skin body 15c Flange part 16 Washer 17 Push pin 18 Stop piece 18b Split leg piece A Air cleaner F Suppressor

Claims (2)

[Claims] A sound absorbing member is formed by forming a similarly porous flange portion around a sound absorbing body made of a porous sound absorbing material to form a sound absorbing member, and a through hole is provided at a predetermined position of the surrounding flange portion. Washers are respectively arranged on the through holes of the sound absorbing member corresponding to the mounting holes provided in the wall of the resin box-shaped body, and the mounting holes of the wall of the box-shaped body and the through holes of the sound absorbing member aligned therewith are provided. ,
A stop pin consisting of a collar having an inner hole and a split leg piece extending forward from the inner hole, a push pin consisting of a rod having a truncated conical portion for expanding the leg piece and a collar closely contacting the inner hole of the stop piece collar. Insert the restraining tool formed in from each from the outside,
An installation device for a sound absorbing member, wherein the sound absorbing member is fixed inside a predetermined wall of the box-shaped body. 2. A sound absorbing member is formed by forming a similarly porous flange portion around a sound absorbing body made of a porous sound absorbing material to form a sound absorbing member, and a through hole is provided at a predetermined position of the surrounding flange portion. Washers are respectively arranged on the through holes of the sound absorbing member corresponding to the mounting holes provided on the side walls of the resin box-shaped body, and the mounting holes on the side walls of the box-shaped body and the through holes of the sound absorbing members aligned with the holes are provided. A stopper having a collar having an inner hole and a split leg extending forward from the inner hole, a push having a rod having a truncated conical portion for expanding the leg and a collar closely contacting the inner hole of the collar. Each of the stoppers formed by pins is inserted from the outside to fix the suction member, while a tenon-shaped protrusion is formed at a predetermined position on the bottom wall of the box-shaped body, and the protrusion is formed on the protrusion. The through-holes of the flanges of the A push nut having a plurality of fan-shaped pieces is fitted into each of the push nuts to fasten the sound absorbing member.