JP2553056B2 - Muffler - Google Patents

Description

TECHNICAL FIELD The present invention relates to a muffler which facilitates attachment of a detachable tail pipe and ensures a seal.

(Prior Art) The tail pipe of the muffler may be detachable in consideration of convenience of cleaning and the like, and conventional examples of the detachable structure are shown in FIGS. 4 to 7, respectively.

That is, FIG. 4 shows the rear end tapered portion 102a of the tail pipe 102.
Shows a structure in which the taper portion 101a of the muffler body 101 is abutted and fastened with a screw 107. FIG. 5 shows a recess 201a formed in a part of the muffler body 201, and a tail pipe 202 slidingly contacting the recess 201a is screwed. A structure for fastening at 207 is shown.

Further, in the structure shown in FIG. 6, the recess 301a is formed in a part of the muffler body 301 as in the structure shown in FIG. 5, but the tail pipe 302 is engaged with the recess 301a of the muffler body 301 via the O-ring 312. The tail plate 4 fixed to the outer periphery of the rear end of the tail pipe 402 is shown in FIG.
05 is fastened by screws 407 to the rear end surface of the muffler body 401 with a gasket 414 interposed therebetween.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional structure for attaching and detaching the tail pipe, the attachment of the tail pipe to the main body of the muffler is difficult even if the attachment of the tail pipe is troublesome or easy. There was a problem that the seal of the part was not perfect.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a muffler capable of facilitating attachment of a detachable tail pipe to a muffler body and ensuring sealing of an attachment portion. Especially.

(Means for Solving the Problems) In order to achieve the above object, according to the present invention, a tail pipe is inserted through a muffler rear end plate fixed to a rear end portion of a muffler body, and the tail pipe is attached to and detached from the muffler rear end plate. In a muffler that is freely attached, the muffler rear end plate is configured to include a vertical portion in which a hole having a diameter larger than that of the tail pipe is opened, and a tapered surface that expands rearward from a peripheral edge of the vertical portion. The tail plate fixed to the outer periphery of the rear end of the tail pipe is formed by bending the rear end peripheral edge of the rear end to a convex shape, and forms a vertical surface and a tapered surface that expands rearward from the peripheral edge of the vertical portion. And the inclination angle of the tapered surface of the tail plate from the vertical surface is set smaller than that of the tapered surface of the muffler rear end plate, and the peripheral edge of the tapered surface of the tail plate is tapered. Close to the surface Therefore, the screw is inserted from the screw insertion hole drilled in the vertical part of the tail plate, and the screw is screwed into the nut fixed to the vertical part of the muffler rear end plate to attach the tail pipe detachably. Is characterized by.

(Operation) According to the present invention, since the inclination angle of the tapered surface of the tail plate from the vertical surface is set to be smaller than that of the tapered surface of the muffler rear end plate, the tail pipe is opened to the muffler rear end plate. The tail plate fixed to the tail pipe is fastened to the rear end plate of the muffler by screws, and the peripheral edge of the tail plate is in close contact with the rear end plate of the muffler. Sealability is secured. In this case, a hole having a larger diameter than the tail pipe is opened in the vertical portion of the muffler rear end plate, so that the tail pipe can be easily inserted into the muffler rear end plate. Moreover, since the rear end peripheral edge of the muffler rear end plate is bent and formed in a convex shape rearward, the peripheral edge portion functions as a kind of spring,
The tapered surface of the muffler rear end plate is relatively easily bent and deformed, and this and the peripheral edge of the tail plate are in close contact with each other with a higher pressure, and a high sealing performance is secured by the mounting portion of the tail pipe.

Further, since the muffler rear end plate and the tail plate are each provided with a vertical portion, the tail plate can be attached to the muffler rear end plate with good workability by screws screwed into the vertical portions.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

1 is a plan sectional view of a rear end portion of a muffler according to the present invention (a sectional view taken along the line I-I of FIG. 3), FIG. 2 is a view in the direction of arrow A in FIG. 1, and FIG. It is a partially broken side view.

As shown in FIG. 1, a detachable tail pipe 2 is attached and supported at a rear portion of the muffler body 1. The tail pipe 2 has a bent portion at an intermediate portion thereof, and a tip thereof is exhausted. A bell mouth portion 2a is formed in order to reduce gas inflow resistance, and a ring-shaped member 3 having a diameter larger than that of the bell mouth portion 2a is welded to the rear outer periphery of the bell mouth portion 2a. The member 3 is slidably fitted and held in a circular hole 4a of a partition wall 4 that partitions the inside of the muffler body 1. Therefore, the front end of the tail pipe 2 is axially slidably supported by the partition wall 4 via the ring-shaped member 3.

Further, a tail plate 5 is welded to the outer periphery of the rear end portion of the tail pipe 2, and the peripheral edge of the tail plate 5 is rearward (in FIG. 1,
It forms a tapered surface 5a that widens toward the right).
The position of the rear end opening of the tail pipe 2 with respect to the tail plate 5 is somewhat eccentric in one direction (right side in FIG. 2) as shown in FIG. A screw insertion hole 5c is formed in a portion (downward in FIG. 1, leftward in FIG. 2) of the portion 5b that is not located at the rear end opening portion of the tail pipe 2.

On the other hand, the rear end portion of the muffler body 1 is closed by a muffler rear end plate 6, and a circular hole 6a through which the tail pipe 2 is to be inserted is opened in the muffler rear end plate 6, The inner diameter of 6a is set larger than the outer diameter of the tail pipe 2. Further, a tapered surface 6b is formed on the peripheral edge of the circular hole 6a of the muffler rear end plate 6, and the circular hole 6a and the tapered surface 6b are formed.
A similar screw insertion hole 6d is formed at a position corresponding to the screw insertion hole 5c formed in the tail plate 5 in the vertical portion 6c between the and. As shown in FIG. 1, the muffler rear end plate 6
The rear edge of the tail plate 5 is bent in a convex shape rearward, and the inclination angle of the tapered surface 5a of the tail plate 5 from the vertical surface is smaller than that of the tapered surface 6b of the muffler rear end plate 6. It is set.

The tail pipe 2 is attached to the muffler body 1 in the following manner.

That is, the tail pipe 2 is pushed into the muffler body 1 through the circular hole 6a opening from the tip bell mouth portion 2a to the muffler rear end plate 6, and the ring-shaped member 3 welded to the outer circumference of the tip portion is opened to the partition wall 4. The tail pipe 2 is fitted and held in the circular hole 4a so as to support the front end portion of the tail pipe 2 slidably in the axial direction.

Then, the tail pipe 2 is further pushed inward of the muffler body 1 so that the peripheral edge of the taper surface 5a of the tail plate 5 is brought into contact with the taper surface 6b of the muffler rear end plate 6 as shown in the figure, and finally the tail plate 5 If the tail plate 5 is fastened to the muffler rear end plate 6 with the screw 7 inserted into the screw insertion holes 5c and 6d formed in the muffler rear end plate 6 and the nut 8 screwed to the screw 7, The attachment of the tail pipe 2 to the muffler body 1 is completed. At this time, as described above, the tail plate 5
The inclination angle of the tapered surface 5a of the muffler from the vertical surface is the muffler rear end plate 6
Since it is set smaller than that of the tapered surface 6b of
The tail plate 5 is screwed to the taper surface 6b of the muffler rear end plate 6.
At the time of fastening, the peripheral edge of the tapered surface 5a of the tail plate 5 is in close contact with the tapered surface 6b of the muffler rear end plate 6 to prevent exhaust gas from leaking, and a high sealing property is secured here.

In addition, the tail pipe 2 is provided in the vertical portion 6c of the muffler rear end plate 6.
Since the circular hole 6a having a larger diameter than the above is opened, the tail pipe 2 can be easily inserted into the muffler rear end plate 6. Further, since the rear end peripheral edge of the muffler rear end plate 6 is bent and formed in a convex shape rearward, the peripheral edge portion functions as a kind of spring, and the tapered surface of the muffler rear end plate 6 is comparatively formed. It is easily bent and deformed, and this and the peripheral edge of the tail plate 5 come into close contact with each other at a higher pressure, and a high sealing property is secured by the mounting portion of the tail pipe 2.

Further, since the muffler rear end plate 6 and the tail plate 5 are provided with the vertical portions 6c and 5b, respectively, the tail plate 5 is attached to the muffler rear end plate 6 by screws 7 that are screwed into the vertical portions 6c and 5b.
It can be attached to the work well.

As described above, the tail pipe 2 can be easily attached only by fastening the tail plate 5 with the single screw 7, and at the same time, high sealing performance is secured.

Further, since the end portion of the tail pipe 2 is slidably supported in the axial direction via the ring-shaped member 3, the tail pipe 2 is expanded and contracted in the axial direction by heating by exhaust heat or cooling after the engine is stopped. However, this expansion and contraction is absorbed by the movement of the tail pipe 2 at the ring-shaped member 3 portion, and excessive thermal stress does not occur in the tail pipe 2.

When the tail pipe 2 is removed from the muffler body 1, one screw 7 may be loosened and removed, and the tail pipe 2 may be pulled out from the muffler body 1.

By the way, as shown in FIG. 3, a diffuser pipe 9 derived from an exhaust system of an engine (not shown) is introduced into the front end portion of the muffler body 1, but the diffuser pipe 9 has an intermediate bent portion 9a. It is fixed to the muffler body 1, and a portion behind (rightward in FIG. 3) the bent portion 9a faces the muffler body 1. The rear end portion of the diffuser pipe 9 is slidably inserted into a cylindrical guide member 11 that is fixedly inserted through a partition wall 10 that partitions the interior of the muffler body 1. Therefore, the diffuser pipe 9
The rear end portion is supported by the tubular guide member 11 so as to be slidable in the axial direction.

Even if the diffuser pipe 9 expands and contracts in the axial direction by heating and cooling the diffuser pipe 9, this expansion and contraction is effectively absorbed by the axial movement of the cylindrical guide member 11 of the diffuser pipe 9. The problem that excessive thermal stress is generated in the diffuser pipe 9 does not occur.

Further, as a result of the rear end portion of the diffuser pipe 9 being supported, the portion of the diffuser pipe 9 facing the inside of the muffler body 1 does not vibrate starting from the bent portion 9a, and the bent portion 9a is destroyed by fatigue, etc. The problem of is effectively solved.

(Effects of the Invention) As is apparent from the above description, according to the present invention, the inclination angle of the tapered surface of the tail plate from the vertical surface is set to be smaller than that of the tapered surface of the muffler rear end plate. Therefore, by inserting the tail pipe into the hole that opens in the muffler rear end plate and fastening the tail plate fixed to the tail pipe to the muffler rear end plate with a screw, the peripheral edge of the tail plate adheres to the muffler rear end plate. The effect that a high sealing property is secured in the mounting portion at the same time as mounting the tail pipe is obtained. In this case, a hole having a larger diameter than the tail pipe is opened in the vertical portion of the muffler rear end plate, so that the tail pipe can be easily inserted into the muffler rear end plate.

Further, since the rear end peripheral edge of the muffler rear end portion is bent and formed in a convex shape rearward, the peripheral edge portion functions as a kind of spring, and the tapered surface of the muffler rear end plate is relatively easily formed. As a result of flexural deformation, this and the peripheral edge of the tail plate are brought into close contact with each other with even higher pressure, and the effect of ensuring high sealing performance by the mounting portion of the tail pipe is obtained.

Further, since the muffler rear end plate and the tail plate are provided with vertical portions, respectively, there is an effect that the tail plate can be attached to the muffler rear end plate with good workability by screws screwed into the vertical portions. To be

[Brief description of drawings]

FIG. 1 is a plan sectional view of a rear end portion of a muffler according to the present invention (3rd
FIG. 2 is a view in the direction of arrow A in FIG. 1, FIG. 3 is a partially cutaway side view of the muffler, and FIGS. 4 to 7 are conventional tail pipes. It is a schematic diagram which shows an attachment / detachment structure. 1 ... Muffler body, 2 ... Tail pipe, 2a ... Bell mouth part, 3 ... Ring member, 5 ... Tail plate, 5a ...
… Tapered surface, 5b …… Vertical part, 6 …… Muffler rear end plate, 6a
...... Circular hole, 6b …… tapered surface, 6c …… vertical part, 7 …… screw, 8 …… nut.

Claims (1)

(57) [Claims] 1. A muffler in which a tail pipe is inserted through a rear end of a muffler fixed to a rear end of a muffler body and is detachably attached to a rear end plate of the muffler, wherein the rear end of the muffler is the tail. The pipe includes a vertical portion with a hole larger in diameter than the pipe and a tapered surface that expands rearward from the peripheral edge of the vertical portion, and the rear end peripheral edge is bent backward to be convex. A tail plate fixed to the outer periphery of the rear end portion of the tail pipe is configured to include a vertical portion and a tapered surface that expands rearward from the peripheral edge of the vertical portion, and the tail plate is formed from a vertical surface of the tapered surface of the tail plate. The inclination angle is set to be smaller than that of the tapered surface of the muffler rear end plate so that the peripheral edge of the tapered surface of the tail plate is brought into close contact with the tapered surface of the muffler rear end plate, and the screw protruding from the vertical portion of the tail plate is provided. Screw from the insertion hole A muffler that is inserted and screwed into a nut fixed to the vertical part of the muffler rear end plate to attach the tail pipe detachably.