JP2005188440A - Resonance silencer for engine or the like - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively utilize space in an engine room by reducing the interval between a resonance silencer and an intake member to which the silencer is connected. <P>SOLUTION: This resonance silencer comprises a box 25 composed of an upper case 21, having an insertion hole 22 at a center in an upper wall 21a, with a downward cylinder as an engagement base part 24 formed on a circumferential edge lower surface, provided with angular window holes 24a at four equally divided positions, and a lower case 23, opened at an upper end, having a circular lower case flange 22b on the upper end. A connection tube 27, provided with four projections 27b at one end part, each having a right triangular section, at equally divided positions in the circumferential direction, having slits between the projections, and connected to an intake member at the other end, is disposed in the insertion hole 22 in the upper case 21, as the projections 27b are respectively engaged with the window holes 24a in the engagement base part 24 in the upper case 21. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a resonance silencer used for attenuating noise in an intake system of an engine, for example, and particularly to a connection structure of a communication pipe between an intake device such as an intake duct and an air cleaner and a silencer box.

  In a vehicular engine, a resonance silencer consisting of a box of a predetermined volume and a communication pipe of a predetermined length is connected in the middle of the intake device of the engine, so that pulsation noise caused by opening and closing of the intake valve and engine combustion Noise such as sound is attenuated.

As such a resonance type silencer, there is known a configuration in which the upper end of the communication pipe 2 as shown in FIG. 5 is connected to the intake pipe D and the box 1 is connected to the middle part or the tip. . In this case, the connection between the communication pipe 2 and the intake pipe D is fitted into a mounting port Da provided in the intake pipe D and fastened by an appropriate clamp member C.
Japanese Patent Laid-Open No. 10-194675

In the case of the resonance type silencer having such a structure, the length of the attachment port Da and a space for tightening the clamp C are required between the upper surface of the box 1 and the intake pipe D. The intake pipe D and the box A predetermined gap must be ensured between the body 1 and the body 1. That part of the space is wasted. Further, when the communication pipe 7 is formed of a bent pipe, a predetermined space corresponding to the diameter, length, etc. of the bent pipe is occupied. In this case, the space in that portion is wasted. Will end up.
It is an object of the present invention to reduce the distance between a resonance silencer and an intake member such as an air intake duct or an air cleaner to which the silencer is connected so as to effectively use a space in an engine room or the like. It is what.

  In order to achieve the above object, in the resonance silencer according to the first aspect of the present invention, a communication pipe in which a plurality of protrusions are formed on one outer surface of an insertion hole of a box having an insertion hole formed on an upper wall. However, the projection of the communication pipe is inserted into the inner peripheral surface of the insertion hole of the box body, and the other end of the communication pipe is connected to the intake member.

  Further, in the resonance type silencer of the invention according to claim 2, a box body in which an insertion hole is formed on the upper wall and an annular or annular fitting base portion having a plurality of window holes on the inner surface of the insertion hole is formed. A communication pipe having a plurality of projections fitted into the window hole of the fitting base at one end thereof is inserted into the insertion hole of the insertion pipe, and the projection of the communication pipe is fitted into the window hole of the fitting base. The other end of the communication pipe is connected to the intake member.

  Furthermore, in the resonant silencer of the invention according to claim 3, the box having an insertion hole formed on the upper wall and an annular or annularly arranged fitting base having a plurality of window holes formed on the inner surface of the bottom wall. A communication pipe having a communication window formed at the center and a plurality of protrusions fitted to the window holes of the fitting base at one end is inserted into the insertion hole, and the protrusion of the communication pipe is inserted into the box body. It is fitted in the window hole of the fitting base, and the other end of the communication pipe is connected to the intake member.

  Furthermore, in the resonance type silencer of the invention according to claim 4, the box having the first and second insertion holes formed in the upper wall and the bottom wall, respectively, is closed at one end by the bottom plate, and communicates with the central portion. A communication pipe having a window and a plurality of protrusions formed on one outer surface of the one end is inserted into the first insertion hole, and one end of the communication pipe is inserted into the second insertion hole. The tube protrusion is disposed in a state of being locked to the lower surface around the second insertion hole of the box, and the other end of the communication tube is connected to the intake member.

Since the present invention is configured as described above, the gap between the duct and the box can be minimized, and the space can be used effectively. In addition, the silencer can be attached to the intake member with a single touch, which can reduce the number of assembly steps. Further, when the intake member and the resonant silencer of the present invention are mounted in a right angle direction, it can be a bent pipe immediately from the upper wall of the silencer, and the straight pipe portion can be minimized or eliminated. As a result, the installation space can be reduced.
In the invention which concerns on Claims 1, 2, and 3, since a junction part is located in the inside of a box, it does not bring about the restrictions on the space to other components.
Further, in the inventions according to claims 3 and 4, since the communication pipe is configured to connect between the top wall and the bottom wall of the box, the rigidity of the box constituting the silencer can be increased. And the occurrence of chatter noise can be reduced.

  Hereinafter, the present invention will be described in detail with reference to the best mode for carrying out the invention shown in the drawings.

FIG. 1 shows a first embodiment of a resonance silencer according to the present invention. The resonance silencer 10 includes a box 15, a communication pipe 17 and a packing 18 forming a resonance chamber 19. Is done.
The box 15 is composed of a box-shaped synthetic resin upper case 11 with its lower end open and a box-shaped synthetic resin lower case 13 with its upper end open. The upper case 11 has an insertion hole 12 having a diameter slightly larger than the outer diameter of the communication pipe 17 at the center portion of the upper wall 11a, and four notches 12a are formed in the insertion hole 12 at equal intervals. The notch 12 a is composed of an arc concentric with the insertion hole 12 and two sides parallel to the center line of the insertion hole 12. Further, an annular upper case flange 11b is formed at the lower end. On the lower surface of the upper wall 11a, four plate-like stoppers 12b facing downward are provided at equal intervals in the center portion in the circumferential direction of the portion without the notch 12a. The lower case 13 has a bottom wall 13a, and a lower case flange 13b is formed at the periphery of the upper end. The lower surface of the upper case flange 11b and the upper surface of the lower case flange 13b are welded and joined to form the box 15.

  The communication pipe 17 is made of synthetic resin, and has four protrusions 17b that are equally shaped, dimensionally, and positioned on the outer peripheral surface of one end (lower end) of the communication pipe 17 that fit into the notch 12a of the box 15 in the circumferential direction. An annular flange 17a is formed above the protrusion 17b at a predetermined interval. The other end of the communication pipe 17, that is, the outer peripheral portion of the flange 17a, is formed integrally with an intake member 16 such as an intake duct or an air cleaner case via a hole flange 16b. The lower end of the communication pipe 17 is inserted into the insertion hole 12 of the box 15 through a packing 18 formed in the same shape as the flange 17a between the upper surface of the upper wall 11a of the box 15 and the protrusion 17b is The other end of the communication pipe 17 and the intake member 16 communicate with each other through a communication hole 16a.

When attaching the box 15 to the communication pipe 17, the packing 18 is disposed in advance between the flange 17a and the protrusion 17b, and the protrusion 17b of the communication pipe 17 and the notch 12a of the box 15 are matched. After the box 15 is pressed in the direction of the intake member 16, it is attached by rotating it to the position of the stopper in the leftward direction.
The stopper formed on the inner surface of the upper wall of the upper case can be omitted, or the box can be integrated with the upper and lower upper cases if pins are inserted during molding. is there.

FIG. 2 shows a third embodiment of the resonance silencer according to the present invention. The resonance silencer 20 is composed of a box 25, a communication pipe 27, and a packing 28 forming a resonance chamber 29. Is done.
The box body 25 is composed of a box-shaped synthetic resin upper case 21 having a lower end opened and a box-shaped synthetic resin lower case 23 having an upper end opened. The upper case 21 has an insertion hole 22 having a diameter slightly larger than the outer diameter of the communication pipe 27 at the center of the upper wall 21a, a downwardly cylindrical fitting base 24 is formed on the peripheral lower surface thereof, and a lower end. An annular upper case flange 21b is formed. In the fitting base 24, rectangular window holes 24a are equally formed at four locations. The lower case 23 has a bottom wall 23a, and a lower case flange 23b is formed on the periphery of the upper end. A box 25 is formed by welding and joining the lower surface of the upper case flange 21b and the upper surface of the lower case flange 23b.

  The communication tube 27 is made of synthetic resin, and has an outer surface at one end thereof in a shape / dimension / position relationship that fits into the window hole 24 a of the fitting base 24 of the upper case 21. Is formed in a right triangle shape, and the lowermost end thereof has the same diameter as that of the communication pipe 27, and four protrusions 27b formed so as to gradually expand upward are provided equally in the circumferential direction. Further, an annular flange 27a is formed above the protrusion 27b of the communication pipe 27 with a predetermined interval. The other end of the communication pipe 27, that is, the outer periphery of the flange 27a, is formed integrally with an intake member 26 such as an intake duct or an air cleaner case via a hole flange 26b. The communication pipe 27 is inserted into the insertion hole 22 of the box body 25 through a packing 28 formed in the same shape as the flange 27a between the upper surface 21a of the box body 25 and the protrusion 27b is fitted to the upper case 21. It is locked in the window hole 24 a of the combined base 24. The other end of the communication pipe 27 and the intake member 26 communicate with each other through a communication hole 26a. 27 d is a slit for bending inward when the communication pipe 27 is inserted into the fitting base 24.

  The box body 25 is attached to the communication pipe 27 in advance by placing the packing 28 between the flange 27a and the protrusion 27b, and the position of the protrusion 27b of the communication pipe 27 to the window hole 24a of the box body 25. Corresponding to the circumferential direction, when the box body 25 is pressed into the insertion hole 22 from below, the slit 27d is bent and the projection 27b is inserted into the window hole 24a in accordance with the taper of the communication pipe.

FIG. 3 shows a third embodiment of the resonance type silencer according to the present invention. The resonance type silencer 30 includes a box body 35, a communication pipe 37 and a packing 38 which form a resonance chamber 39. Consists of.
The box 35 is composed of a box-shaped synthetic resin upper case 31 whose lower end is opened and a box-shaped synthetic resin lower case 33 whose upper end is opened. The upper case 31 is formed with a circular insertion hole 32 having a diameter slightly larger than the outer diameter of the communication pipe 37 at the center of the upper wall 31a, and an upper case flange 31b at the lower edge. The lower case 33 has a bottom wall 33a, and a lower case flange 33b is formed on the periphery of the upper end. A fitting base 34 is formed in the center of the inner surface of the bottom wall 33a and has a fitting base 34 that is coaxial with the insertion hole 32 of the upper case 31 and has an inner diameter that is the same as the insertion hole 32 of the upper case 31. A rectangular window hole 34a is formed in four equal parts. The lower surface of the upper case flange 31b and the upper surface of the lower case flange 32b are welded and joined.

  The communication pipe 37 is made of a synthetic resin and has a straight pipe part in the front and rear, and the middle part is formed in an arc shape. The straight pipe part on one end side of the insertion hole 32 of the upper case 31 is located inside the box. It is inserted and arranged as you do. On the outer peripheral surface of one end portion of the communication pipe 37, a plurality of projections 37b having shapes, dimensions, and positional relationships that are fitted into the window holes 34a of the fitting base 34 of the lower case are provided at equal intervals. The protrusion 37b is formed so that the axial cross section of the communication pipe 37 has a right triangle shape, and the lowermost end has the same diameter as the communication pipe 37 and gradually expands upward. Such a protrusion 37 b is fitted into the window hole 34 a of the fitting base 34 of the lower case 33. The other end of the communication pipe 37 is connected to a communication hole 36a formed in an intake member 36 such as an intake duct or an air cleaner case. Further, an annular flange 37 a is provided at a portion of the communication pipe 37 located on the upper surface of the upper wall of the box 35. A packing 38 is disposed between the lower surface of the annular flange 37a and the upper surface of the upper wall 31a of the box 35. A strip-shaped communication window 37c is formed in four equal parts on the circumference in a portion of the communication pipe 37 located in the box 35. The slit 37d provided at the lower end of the communication pipe 37 is for allowing inward deflection when the communication pipe 37 is inserted.

The box 35 is attached to the communication pipe 37 in the same manner as in the first embodiment, except that the tip of one end of the communication pipe 37 is inserted into the bottom wall 33a of the box 35.
In this embodiment and the second embodiment, the fitting base portion has a cylindrical shape. However, an intermittent shape on the circumference, that is, a pillar shape is arranged annularly, or the circumference is In addition to the intermittent shape at the top, instead of the rectangular window hole 34a in the third embodiment (FIG. 3), one side of the circumferential direction is opened and a notch shape (a U-shaped notch) is formed. The box body may be attached by rotating in the axial direction. In this case, the protrusion does not need to be triangular.

FIG. 4 shows a resonance silencer according to a fourth embodiment of the present invention. The resonance silencer 40 includes a box body 45 and a communication pipe 47 that form a resonance chamber 49. The
The box 45 is made of a synthetic resin and has a rectangular parallelepiped shape. Insertion holes 42 and 44 are formed at the center of each of the upper wall 41a and the bottom wall 43a. The insertion hole 42 has a communication pipe 47 described later. The insertion hole 44 has a diameter slightly larger than the outer diameter of the communication pipe 47. The insertion hole 44 has four notches 44a as in the case of the first embodiment. The two insertion holes 42 and 44 are coaxial with each other, and four downward stoppers 44b are provided at the center in the circumferential direction of the portion of the bottom wall 43 where the notch 44a of the insertion hole 44 is absent.

The communication pipe 47 is made of synthetic resin, and has four protrusions 47b equally shaped in the circumferential direction, fitted on the notch 44a of the box body 45 on one outer end (lower end) thereof. An annular flange 47a is formed above the protrusion 47b and spaced apart from the upper surface of the protrusion 47b by a predetermined distance (approximately the dimension between the upper surface of the upper wall 41a of the box body 45 and the lower surface of the bottom wall 43a). . One end (lower end) of the communication pipe 47 is closed by a bottom plate 47e, and a strip-shaped communication window 47c is formed in four equal parts on the circumference in a portion located in the central box 45. ing. The other end is formed integrally with an intake member 46 such as an intake duct or an air cleaner case via an annular flange 47 and a hole flange 46b. The lower surface of the flange 47 a is located on the upper surface of the upper wall of the box body 45.
The communication tube 47 is inserted into the insertion hole 42 of the box body 45, the lower end portion is inserted into the insertion hole 44 of the box body 45, and the upper surface of the protrusion is locked to the peripheral lower surface of the insertion hole 44. The other end of the communication pipe 47 and the intake member 46 communicate with each other through a communication hole 46a. A strip-shaped communication window 47 is formed in four equal parts on the circumference at a portion of the communication pipe 47 located in the box 45.

The box body 45 is attached to the communication pipe 47 by aligning the position of the projection 47b at the lower end of the communication pipe 47 with the position of the notch 42a of the box body 45 and inserting it through the insertion hole 42. The wall 41a is attached by being pushed up until the upper surface of the wall 41a reaches the lower surface of the flange 47a, and further rotated in the leftward direction to the position of the stopper.
In this embodiment and the first embodiment as well, as in the second and third embodiments, the protrusions can be changed to have a right-angled triangular cross section in the axial direction.

In the said embodiment, although the shape of the box was a rectangular parallelepiped, the shape of a box may be arbitrary shapes, such as a cylindrical shape, and is not limited to a rectangular parallelepiped. Further, as the box, the divided structure composed of the upper and lower cases in the first, second and third embodiments, and the integrated structure in the fourth embodiment, but either the integrated structure or the divided structure. There may be. Furthermore, when the box has a split structure, the flanges are welded to each other. However, the flanges may be integrated with bolts and nuts via packings.
Furthermore, a box with a one-piece structure is generally manufactured by blow molding. In this case, if the peripheral edge of the insertion hole into which the insertion pipe is inserted is thickened, the fitting with the communication pipe is ensured. can do. The stoppers on the upper and lower walls are positioned with respect to the air intake parts when the box is square, but are not necessary when the box is cylindrical.

The structure of the one end side of the communication pipe has a bayonet structure in the first and fourth embodiments and a flexible structure by a slit in the second and third embodiments, but is not limited thereto. Moreover, the shape of the projection of the communication pipe can be various, but the window hole of the fitting base corresponds to the shape of the projection. Further, in the above embodiment, the connection between the communication pipe and the intake member is an integral structure, but it can be made detachable by changing to a bayonet type or the like. Furthermore, the shape of the communication tube is not particularly limited, such as a straight tube shape or a bent tube shape, and can be an appropriate shape. The frequency at which the intake sound is attenuated can be changed by changing the position, shape, size, etc. of the communication window of the communication pipe.
The packing attached between the box and the flange of the communication pipe is better because it does not cause sound leakage or the like, but may be omitted depending on the required specifications.

  The present invention is used by being connected to an intake system such as an intake duct or an air cleaner of an engine, an air system of a compressor, or the like.

It is a figure which shows the 1st form for implementing this invention, (a) is the sectional drawing, (b) is a figure which shows the arrow A in figure (a). Sectional drawing of the 2nd form for implementing this invention. Sectional drawing of the 3rd form for implementing this invention. It is a figure which shows the 4th form for implementing this invention, (a) is the sectional drawing, (b) is a figure which shows the arrow B in figure (a). Sectional view of a conventional resonant silencer

Explanation of symbols

10, 20, 30, 40 Resonance-type silencer 15, 25, 35, 45 Box 11, 21, 31, 41 Upper wall 12, 22, 32, 42 Insert hole 13a, 23a, 33a, 43a Bottom wall 24, 34 Fitting base 44 Insertion hole 24a, 34a Window hole 16, 26, 36, 46 Air intake member 17, 27, 37, 47 Communication pipe 17b, 27b, 37b, 47b Projection 37c, 47c Communication window 47e Bottom plate

Claims (4)

  A communication pipe having a plurality of protrusions formed on the outer peripheral surface of one end is inserted into the insertion hole of the box having an insertion hole formed in the upper wall, and the protrusion of the communication pipe is inserted into the inner peripheral surface of the insertion hole of the box. A resonance type silencer that is locked and further connected to the intake member at the other end of the communication pipe.   An insertion hole in the box having an insertion hole on the upper wall and an annular or annular fitting base having a plurality of window holes on the inner surface of the insertion hole, and a window hole of the fitting base at one end Resonance type in which a communication pipe formed with a plurality of protrusions to be fitted into the insertion pipe is inserted, the protrusion of the communication pipe is fitted into the window hole of the fitting base, and the other end of the communication pipe is connected to the intake member Silencer.   A communication window is formed in the center part of the insertion hole of the box body in which the insertion hole is formed in the annular wall or the annularly arranged fitting base having the insertion hole in the upper wall and the plurality of window holes in the inner surface of the bottom wall. A communication pipe in which a plurality of protrusions that fit into the window hole of the fitting base is formed is inserted, and the protrusion of the communication pipe is fitted into the window hole of the fitting base of the box body. A resonance silencer having the other end connected to an intake member.   A box with first and second insertion holes formed on the top and bottom walls, respectively, is closed at one end with a bottom plate, a communication window is formed at the center, and a plurality of protrusions are formed on the outer surface of the one end The upper part of the communication window is inserted into the first insertion hole, the one end of the communication pipe is inserted into the second insertion hole, and the protrusion of the communication pipe is locked to the lower surface around the second insertion hole of the box. A resonance type silencer that is arranged in a state where the other end of the communication pipe is connected to the intake member.

Images