JPS60206920A - Muffler for internal-combustion engine - Google Patents

Abstract

PURPOSE:To reduce the weight while to improve the sound absorbing effect and the appearance by forming the housing of muffler with a plurality of splitted members of molded sound absorbing material while fitting bonding members at the joints through engaging sections. CONSTITUTION:The housing 2 of muffler 1 is formed into a tube where the left and right splitted members 3 are jointed through heat-resistant adhesive while each splitted member is formed with molded sound absorbing member. Here, the projected sections 6 formed at the upper and lower flat sections 4 of each splitted member 3 are abutted then held by a caulking tool 7 and jointed through adhesive 4 to form an engaging section 8. Thereafter, the groove section of an engaging member 9 is fitted over the engaging section 8 while the engaging member 9 is jointed to the housing 2 to make flat the surfaces of them 9, 2 under jointed state. Consequently, the weight is reduced while excellent assemblability is achieved and the sound absorbing effect is improved. At the sametime, the strength at the joint and the appearance are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a quenching system for reducing antagonism noise generated when exhaust gas generated during combustion in an internal combustion engine is dissipated to the outside.
Regarding knife utensils.

A typical muffler forms an expansion chamber in an outer box made of steel plate, and introduces the loss gas into this expansion chamber to make it tense, consuming the energy held by the loss gas and reducing the energy by 4 Jl 1°1. I try to do that.

By the way, the outer box is constructed by forming a flange part bent outward on the periphery of a press-formed steel plate, and then welding these flanges together, so that the welded part does not come from the outer box surface. There is a problem in that it stands out and lacks a sense of unity. In addition, if the outer box is made of a steel plate, although it has a certain degree of sound insulation, it has poor B absorption properties, and is not sufficiently effective as a 1°F extinguisher. There are disadvantages such as

The present invention has been made in view of the above-mentioned problems with the muffler, and provides a muffler for an internal combustion engine that is lightweight, has a sufficient number of steel plates, has excellent sound absorption properties, and has an excellent appearance due to its sense of unity. The purpose is to

In order to achieve such an object, the present invention forms the outer case of the muffler by joining a plurality of divided bodies made of molded sound-absorbing material, and also provides a retaining part integrally along the joined part. , the gist is that a connecting member whose surface is flush with the surface of the outer box is fitted into this retaining portion.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Figure ε(5) is a longitudinal cross-sectional view of the muffler (1) according to the present invention, and Fig. 2 is a cross-sectional view taken along the line A-A in Fig. 1.
The outer box (2) of the left and right divided bodies (3) has a cylindrical shape, and is made by joining the left and right divided bodies (3) through a heat-resistant material.
3) , (3) is composed of molded sound absorbing material.

Here, an example of the forming force V of the 1171 body (3) will be described below.

First, non-primary production M of glass long fibers or ceramic fibers, etc.
] Alternatively, organic long fibers such as polyester are cut into appropriate lengths and mixed, subjected to roller pressure and needling to form matte TA fibers, and this matte 1N1 fiber is impregnated with a binder such as water glass. After that, mat-like fibers are placed inside a molded material having a molding surface capable of forming the desired shape, that is, the divided body (3), and fired under pressure. Then, the divided body (3) has a hard layer (tight layer) in the part in contact with the high-temperature molding surface (3b) and a porous layer in the other part (3a)
is obtained.

In order to increase the thickness and hardness of the hard layer (3b), for example, the surface of the cloak-like fiber is impregnated with a thermosetting resin such as epoxy resin as a binder separately from water glass and then baked. Alternatively, it is possible to apply a thermoplastic resin after firing.

The shape of the obtained divided body (3) has a substantially semicircular cross section, the upper and lower parts are flat surfaces (4), and the middle part is a curved part (5). 4), a protrusion (6) is integrally formed outwardly at the distal end thereof. As shown in FIG.
i) and (13) are butted together, clamped with the caulking tool (7), and joined via the adhesive (4), resulting in a trapezoidal shape in which the base is constricted by the protrusions (8)' and (6). An engaging portion (8) is formed. Furthermore, as shown in FIG. 4, a structural part (lO) formed on a semicylindrical retaining member (9) is fitted into the engaging part (8) and engaged with the outer box (2) with adhesive. The member (9) is joined to form the state shown in FIG. Here, the surfaces of the coupling member (8) and the outer box (2) are set to be flush in the joined state, so that they exhibit a sense of unity.

On the other hand, the front end of the outer box (2) is made of a cylindrical heat insulating adsorbent (11).
A heat-resistant gas seal (13) is provided between the tip of the heat-insulating and sound-absorbing material (11) and the exhaust pipe (12). . In addition, the inside of the outer box (2) is connected to 'il+4
) is divided into a first expansion chamber (16) and a second expansion chamber (17) by a separator (15) having 11 tubes passing through it, and a tail pipe (1B) is held at the rear end of the outer box (2). ing. Here, a large number of small holes (12a) are formed in the part of the exhaust pipe (+2) in contact with the adiabatic suction 1" material (11) and the part in contact with the porous layer (3a) of the tail pipe (18).
), (18a) to improve the sound absorption effect, and the exhaust pipe (12), separator (15) and tail pipe (18) are formed with a long plate-shaped seal & (19). Welded and further this seal plate (18)
The parts (3) and (3) are bonded to the inner side of the joint with a heat-resistant adhesive. In this way, by coupling the exhaust pipe (12), separator (15) and tail pipe (18) to the seal & (1!3), the coupling strength of the internal structural parts of the silencer (1) is improved,
Furthermore, the strength of the joint is improved by pasting the seal plate (19) inside the joint.

FIG. 6 is a sectional view similar to FIG. 2 showing another embodiment,
In this embodiment, a four part (20) is formed on the outer side of the joint between the divided bodies (3) and (3), and a connecting member (21) is fitted into this recess (20) via an adhesive. There is.

That is, the retaining part (22) formed at the center of the four parts (20) fits into the groove part (23) formed in the coupling member (21), and the groove parts (24) formed on both sides of the retaining part (22) fit together. , (24
) and the protrusions (25) formed on both sides of the groove (23).
) are fitted, and the surfaces of the coupling member (21) and the outer box (2) are flush with each other in a state where the four parts (20) and the coupling member (21) are fitted.

7 to 11 show another embodiment of the structure of the joint between the outer box and the coupling member, and in the embodiment shown in FIG. 7, the divided bodies (3), (3) A retaining part (26) consisting of a plurality of concave and convex parts is located in a concave (20) formed on the outside of the joint part.
), and the engagement portion (2B
) is provided, and in the embodiment shown in FIG. 8, the retaining part (2B) provided in the fourth part (20) is an uneven part in which peaks and valleys are continuous, The coupling member (21) is formed with a concavo-convex portion (29) that fits with this concave-convex portion, and a ninth
In the embodiment shown in the figure, a convex retaining part (30) is formed in the center of the fourth part (2o), and engaging parts ( 31), and the coupling member (21) also has these engaging portions (30), (
forming uneven portions (32) and (33) that fit into 31);
In the embodiment shown in FIG. 1θ, uneven retaining parts (34) and (35) in which acute-angled peaks and valleys are continuous are formed on the bottom and both sides of the fourth part (20), and the connecting member (21) also has an uneven portion (36) that fits into the engaging portions (34) and (35).
), (37), and in the embodiment shown in FIG.
0) with uneven engaging parts (38) and four parts (20) on both sides.
A convex retaining portion (40) is formed at an appropriate location, and the engaging portions (38), (39), (40) are formed on the connecting member (21).
), the four parts (41), the uneven part (42) and the hole (4
3). In any of the embodiments, the fourth part (20) and the connecting member (21) are bonded together using a heat-resistant adhesive, and the surface of the outer box (2) and the surface of the connecting member (21) are bonded together. are flush.

In addition, the following]- shows an example of implementation of the present invention,
The shape of the connection between the outer box and the connecting member is not limited to the above, but any shape may be used as long as the abutting portions of the left and right divided bodies are securely held by the connecting member. Further, the material of the coupling member may be a molded sound absorbing material, but is not limited to this, and may be any material such as synthetic resin or metal.

As described above, according to the present invention, the outer box of the silencer itself is constructed by joining a plurality of divided bodies made of molded sound-absorbing material, so it is lightweight and easy to assemble. It is possible to create a muffler with a greatly improved sound absorption effect (11), and since the retaining part is integrally molded at the joining part of the divided body and the joining member is fitted into this engaging part, the molded sound absorbing material The strength of the joints, which would be a problem when forming the outer box using the same method, can be sufficiently increased.Furthermore, since the surface of the connecting member and the surface of the outer box are flush with each other, the sound muffler has a sense of unity. It has many effects such as improving the appearance and product value.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a longitudinal sectional view of a silencer according to the present invention, and FIG.
3 is a perspective view showing the process of butting the divided bodies together; FIG. 4 is a perspective view of the connecting member; and 514 is a perspective view showing the fitted state of the outer box and the connecting member. FIG. 6 is a sectional view similar to FIG. 2 showing another embodiment, and FIGS. 7 to 11 are sectional views of main parts of another embodiment. In the drawings, (1) is a silencer, (2) is an outer box, (3) is a 1:1 body, (4) is a contact material, (8), (22)
, (2B), (2B), (30), (31), (34)
, (35), (38), (39), and (40) are engaging parts,
(9) and (21) are retaining members. 'I'rat Applicant Honda Motor Co., Ltd.
Nakagawa Sangyo Co., Ltd. Agent: ``Bulled soil Lower Ill Volume section bu'' Filled soil Kunihiko Ohashi Same bu Filled soil Koyama Yu 3 Figure 3 7 Figure 4 Figure 6

Claims (1)

[Claims] In a muffler into which exhaust gas generated due to combustion of an internal combustion engine is introduced, the outer box of the muffler is made by joining a plurality of divided bodies made of molded suction material. The retaining part is integrally formed, and the mole is inserted into this retaining part from the outside.
45. A silencer for an internal combustion engine, in which a coupling member 7i is fitted, and the surface of the coupling member 7i and the surface of the outer case are flush and continuous.