JPS6085213A - Sound absorbing type muffler - Google Patents

Abstract

PURPOSE:To prevent sound absorbing fiber from being scattered by winding a fiber mat around an inner pipe inserted in a cylindrical outer shell, which is partitioned by separate plates, and providing annular fiber mats between the axial end parts of said mats and said separate plates. CONSTITUTION:The both end parts of an outer shell 1 are closed by end plates 2, and an inner pipe 3, which is inserted inside, is supported by the both end plates 2. The inside of the outer shell 1, outside the inner pipe 3, is partitioned by two separate plates 7, a fiber mat 10 is wound around the outer periphery of the inner pipe 3, and an annular mat 11 is interposed between each axial end part of the fiber mat 10 and each end plate 2 and each separate plate 7 respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a muffler incorporated in an exhaust system of an internal combustion engine used in vehicles such as automobiles, and particularly relates to a muffler of a sound-absorbing type having a sound-absorbing fiber member in a muffler chamber. A sound-absorbing muffler generally includes a cylindrical outer shell, and end plates provided at both ends of the outer shell to close each end.
Penetrating the end plate, extending axially into the outer shell between the end plates 1 and 1, cooperating with the outer shell and the end plate to define a silencing chamber with an annular cross section, and opening into the silencing chamber. The sound-absorbing chamber is filled with a sound-absorbing fiber material having heat resistance, such as glass wool.

In the above-mentioned type of sound absorbing muffler, in many cases, the sound muffling chamber is divided into a plurality of parts in the extending direction of the inner pipe, that is, in the axial direction, by separator plates 1 to 1 provided in the outer shell. Each of the plurality of sound-absorbing chambers is filled with a sound-absorbing fiber member.

Various methods are used to fill the sound deadening chamber with the fiber material for absorption, such as a glass wool mat.When a fiber mat is used, the fiber mat is wrapped around the inner vibe and filled. With this measure, the sound-absorbing fiber member can be filled relatively uniformly in the sound-absorbing chamber. However, in this case, 4
The cut cross section of the 1i wire pine directly contacts the end plate and the separate plate, and especially the part that contacts the separate plate passes through the gap created between the outer periphery of the separate plate and the inner periphery of the outer shell. The ends of the sound-absorbing fibers are exposed to the flow of high-temperature exhaust gas flowing between the silencing chambers, and there is a risk that the ends of the sound-absorbing fibers may break due to thermal fatigue and fly off. This problem has become more prominent as the exhaust gas pressure increases due to higher engine speeds, and has become a problem in recent years.

OBJECT OF THE INVENTION The present invention addresses the above-mentioned problems and provides a sound absorbing 1! It is an object of the present invention to provide a sound absorbing type muffler having excellent durability, in which a sound damping chamber is filled with sound absorbing fibers in a manner devised to prevent the i-fibers from breaking and scattering.

According to the present invention, the present invention provides a cylindrical outer shell, end plays 1 to 1 provided at both ends of the outer shell and closing each end, and an end play that passes through the end plate and connects to the end play 1. an inner pipe having a hole extending in the axial direction into the outer shell in between and cooperating with the outer shell and the end plate to define a sound damping chamber with an annular cross section and opening into the sound damping seedling; A sound-absorbing noise-muffling device comprising a separate plate provided in an outer shell and dividing the sound-damping chamber into a plurality of parts in the extending direction of the inner vibe, and a sound-absorbing fiber member filled in each of the plurality of divided sound-damping chambers. In the device, the sound-absorbing fiber member is sandwiched between a fiber mat wrapped around the inner vibe, an axial end of the Ti fiber mat, and the separate plate. This is achieved by a sound-absorbing muffler characterized by being constructed from a rounded annular mat made of navy blue.

Effects of the Invention According to this configuration, a circular fiber mat is sandwiched between the axial end of the fiber mat wound around the inner pipe and the separate plate. A flow resistance is provided to the flow of exhaust gas flowing between the silencing chambers through a gap formed between the outer peripheral edge of the barrier plate h and the inner peripheral edge of the outer shell, so that the exhaust gas flows through the gap. As the sound-absorbing fibers flow between the sound-absorbing chambers, the thermal fatigue of the sound-absorbing fibers is reduced, and the accompanying breakage and scattering of the sound-absorbing fibers is avoided.

DESCRIPTION OF EMBODIMENTS The present invention will now be described in detail with reference to embodiments with reference to the accompanying drawings.

In the figure, 1 indicates a cylindrical outer shell;
'The outer shell 1 is attached to both ends of the mole and each end is closed by an end plate 2 on the IJ.'
- An inner vibe 3 is installed in the throat plate 1 so as to extend in the axial direction at the center thereof, and the inner vibe has two ends of the inner vibe 3 through which the inner vibe 3 is inserted.
It is supported by the 1-nd brake;-2 at one end, and the IJI gas person 1-14 is configured at one end, and the 111-gas person 1-14 is configured at the other end. The big door! In the example, a combination J is made up of two bino parts 3a and 31 which are divided into two in the direction of the 1111 line Zj, and one of the bino parts 3a is attached to one end of A. is fixed to the end plates 1 to 2 of the other pipe member 3bt, and one end 6, etc.
The outer shell '1 and the incivive part (A) are fixed to each other, and the two ends of the two vibrator parts (A) are engaged with each other so as to be able to move relative to each other in the axial direction. It's like absorbing J.)C.

Outer shell 1, inner vibe 33 and [Yorini J
First touch both ends to end plate 2, 1, limit I/
j A silencing chamber 6 with a 19-shaped cross section is defined, and the silencing chamber is divided into three silencing chambers 6a by two separate plates 7 provided on the outer periphery of the inner vibe 3 and spaced apart from each other in the axial direction. It is divided into 6b and 6G. The inch vibrator 3 is provided with a plurality of small holes 8 that open to each sound deadening chamber.

Each of the silencing chambers 68 to 6c is filled with a heat-resistant male sound-absorbing fiber member 9 such as glass wool. As clearly shown in FIG. 2, the sound-absorbing fiber member 9 is located between a fiber mat 10 wrapped around the inner pipe 4, an axial end of the fiber mat 10, and the end plate 2, or [Includes an annular vlA fiber mat 11 interposed between the axial end of the mat 10 and the separate plate 7, and furthermore, in the illustrated embodiment, the cross-sectional shape of the silencing chamber is oval. Therefore, it has a fiber mat 12 folded in an S-shape and rolled up into a fiber mat 10.

The outer circumferential edge of the separate plate 7 and the inner circumferential edge of the outer shell 1 are simply joined together and are not fixed by any fixing means such as welding. A gap is created between the separate plates 1 to 7 and the axial ends of the fibrous mats 10 to 10 to allow the flow of exhaust gas. The fiber packing density prevents the gap from becoming sparse, provides flow resistance to the flow of exhaust gas flowing through the gap, and suppresses or prevents the flow of the waste gas. This reduces or eliminates the flow of exhaust gas between the sound-absorbing chambers, improves the thermal durability of the sound-absorbing fibers forming the sound-absorbing fiber member 9, and prevents the sound-absorbing fibers from breaking and scattering at an early stage.

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited thereto.
It will be apparent to those skilled in the art that various embodiments are possible within the scope of the invention.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view showing one embodiment of the sound absorbing type muffler according to the present invention, and FIG. 2 is a longitudinal sectional view showing one of the sound absorbing fiber members used in the sound absorbing type muffler according to the present invention shown in FIG. It is a perspective view showing an example. 1... Outer shell, 2... End plate, 3...
... Inner pipe, 4 ... Exhaust gas inlet, 5 ... Exhaust gas outlet, 6 ... Silence chamber, 7 ... Separate plate, 8 ... Small hole, 9 ... Sound-absorbing fiber member , 10~
12...Fiber mat special K [Applicant: Toyota Motor Corporation Agent: Patent attorney: Masaki Akashi

Claims (1)

[Claims] A cylindrical outer shell, an end plate provided at both ends of the outer shell and closing each end, and a cylindrical outer shell extending in the axial direction into the outer shell passing through the end plate between the end plates 1 and 1. an inner pipe that cooperates with the outer shell and the end plate to define a silencing chamber with an annular cross section and having a hole opening into the silencing chamber;
A separate plate is provided in the outer shell and divides the sound deadening chamber into a plurality of parts in the extending direction of the inner pipe, and a sound absorbing m1stt member is filled in each of the divided sound deadening chambers. In the sound absorbing type muffler, the sound absorbing fiber member is sandwiched between an Ii fiber mat wrapped around the inner pipe, an axial end of the fiber mat, and the separate plate. A sound-absorbing muffler characterized by being composed of a ring-shaped fiber mat.