JP4076363B2 - Muffler mounting structure - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to assembling exhaust system parts, and more particularly to improving the accuracy of attaching an exhaust pipe to a muffler.
[0002]
[Prior art]
As a method of attaching the exhaust pipe to the muffler, both the inlet tube and outlet tube of the muffler, or the flange fixed to the outlet or inlet tube, and the flange fixed to the exhaust pipe are fastened with bolts and nuts. There is a so-called “flange system”. This method has a problem that the processing cost for welding the flange to each tube is high.
[0003]
As a solution to the above problem, there is a so-called “insertion method” in which one tube is inserted into the other tube.
However, in the “insertion method”, it is difficult to determine the position in the longitudinal direction of the muffler. Alternatively, it has been difficult to determine how much the exhaust pipe is inserted into the muffler side.
Further, there is a problem that if the circumferential direction is deviated, it cannot be attached or excessive initial stress is applied.
[0004]
[Problems to be solved by the invention]
The present invention has been proposed in view of the above-described problems of the prior art, and aims to provide an inexpensive muffler mounting structure that is easy to mount and position.
[0005]
[Means for Solving the Problems]
In the muffler mounting structure of the present invention, the mounting positioning member (3) is installed on the outlet pipe (2) of the muffler (1), and the mounting positioning member (3) has a first end surface (31 on the longitudinal tail tube side). ) And a second end surface (32), and the first end surface (31) on the longitudinal tail tube side contacts the first end surface (41) on the longitudinal muffler body side of the clamp (4). The outlet pipe (2) is positioned so as to be in contact with the outlet pipe (2), and the second end face (32) on the longitudinal tail tube side contacts the end face (52) on the muffler body side of the tail tube (5). (2) is configured to adjust the amount of insertion when it is inserted into the tail tube (5), and a protrusion (33) protruding toward the tail tube is formed. Is flat in the axial direction An end surface (33a) is formed, and the end surface (33a) parallel to the axial direction is in contact with the flat plate surface (43) of the clamp (4) to position the outlet pipe (2) in the circumferential (rotation) direction. (Claim 1: FIG. 1 to FIG. 9).
[0006]
According to the muffler mounting structure of the present invention having the above-described configuration, the first end surface (31) on the longitudinal tail tube side of the mounting positioning member (3) is on the longitudinal muffler main body side of the clamp (4). Abutment with the end face (41) facilitates positioning of the outlet pipe (2) in the longitudinal direction of the muffler.
[0007]
Further, the second end surface (32) on the side of the longitudinal tail tube abuts on the end surface (52) of the tail tube (5) on the muffler body side, and the outlet pipe (2) is inserted into the tail tube (5). The amount of insertion can be accurately determined.
[0008]
The end surface (33a) parallel to the axial direction formed on the protrusion (33) is in contact with the flat plate surface (43) of the clamp (4), so that the outlet pipe (2) can be easily positioned in the circumferential direction. .
[0009]
The end surface (34) close to the muffler main body and the end surface (35) far from the muffler main body of the mounting positioning member (3) are configured to have complementary shapes (claim 2).
[0010]
Since the end surface (34) near the muffler of the mounting positioning member (3) and the end surface (35) far from the muffler have complementary shapes, the mounting positioning member (3) is press-molded. To do this, use a press mold (punch and die) that has the same shape as the end face and only one end, and send the product (mounting positioning member) width material (raw material) by the length of the product. The material yield can be increased to the maximum without creating a crosspiece.
[0011]
The mounting positioning member (3) has a muffler side end surface (34) formed with a recess (36) cut out in the rear direction, and the recess (36) is formed so as to receive the positioning rod-shaped member (A). (Claim 3: FIGS. 8 and 9)
[0012]
According to the muffler mounting structure of the present invention having such a configuration, since the positioning rod-like member (B) is formed in the recess (36), the mounting positioning member (3) is attached to the muffler (1). When fixing (for example, welding) to the outlet pipe (2), positioning can be performed easily and reliably.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
In FIG. 1, the muffler 1 includes a muffler body 1A, an inlet pipe (not shown) that passes through a front face (not shown) of the muffler body 1A, and an outlet pipe 2 that passes through a rear surface 1Ar of the muffler body 1A.
[0014]
On the periphery of the outlet pipe 2, a plate-like attachment positioning member 3 whose unfolded shape is shown in FIG. 8 is formed and fixed in an upwardly convex triangular shape as shown in FIGS. ing.
[0015]
In FIG. 8, when the attachment positioning member 3 is fixed to the outlet pipe 2, the upper part of FIG. 8 is the end face 34 near the muffler main body side 1A, and the lower part of the figure is the end face 35 end face far from the muffler main body 1A side. is there.
[0016]
A projection 33 is formed near the center of FIG. 8 (near the center of the mounting positioning member 3) on the end surface 35 far from the muffler main body 1A, and the first end surface 31 is located on the left side of the projection. A second end surface 32 is formed on the right side of the adjacent and end surface 31.
[0017]
Further, the first end face 31 side of the projection 33 is formed with a vertical face in the drawing, that is, an axially parallel end face 33a parallel to the center axis of the outlet pipe 2 when fixed to the outlet pipe 2. ing. The first end face 31 is located below the second end face 32, that is, a position away from the muffler main body 1 </ b> A when fixed to the outlet pipe 2.
[0018]
Moreover, the end surface 34 close to the muffler main body and the end surface 35 far from the muffler main body of the mounting positioning member 3 are configured to have complementary shapes.
[0019]
When the mounting positioning member 3 is press-molded in such a complementary shape, a press-molding die (punch and die) having only one end and the same shape as the end surface is used, and a product (mounting positioning member) is used. ) If the width of the material (raw material) is sent by the length of the product, the material yield can be maximized without creating a crosspiece.
[0020]
When the mounting positioning member 3 is fixed to the outlet pipe 2, as shown in FIG. 7, the mounting positioning member 3 is fixed to the outlet pipe 2 by welding, for example, after being formed into a left-right target mountain shape (convex shape).
[0021]
1 and 2, when the tail tube 5 is attached to a vehicle, the outer diameter of the outlet pipe 2 of the muffler 1 is inserted into the inner diameter of the tail tube 5, and the end surface of the tail tube 5 on the muffler side In the vicinity of 52, a plurality of slits 55 are provided in the muffler side end face 52.
The length of the reciprocal slit 55 is slightly shorter than the amount of insertion, facilitating insertion of the outlet pipe 2 and preventing leakage of exhaust gas from the slit 55.
[0022]
The clamp 4 includes an annular portion 4R, a first flat plate portion 43 extending radially outward at one end point of the annular portion 4R, and a radially outer portion at the other end point of the annular portion 4R. A second flat plate portion 44 having an L-shaped bent portion extending toward the flat plate portion 43 while maintaining a certain distance and having a tip abutting against the flat plate portion 43 while facing the flat plate portion 43. And a mounting hole 45 drilled at the same projected position in the center of the surface of the first and second flat plate portions 43 and 44.
[0023]
Next, the procedure for inserting the outlet pipe 2 into the tail tube 5 and attaching the clamp 4 will be described with reference to FIGS.
[0024]
First, the tail tube 5 is passed through the clamp 4, and the clamp 4 is temporarily attached to the tail tube 5.
The tail tube 5 temporarily attached with the clamp 4 is brought close to the outlet tube 2 of the muffler 1 and the outlet tube 2 is inserted. When the outlet tube 2 is inserted, the outlet tube 2 is pushed in until the muffler side end surface 52 of the tail tube 5 comes into contact with the second end surface 32 of the mounting positioning member 3.
[0025]
After the end surface 52 on the muffler main body side of the tail tube 5 is brought into contact with the second end surface 32 of the mounting positioning member 3, the clamp 4 in the temporarily attached state is moved to the muffler side, and the muffler main body side of the clamp 4 is moved. The end surface 41 is brought into contact with the first end surface 31 of the mounting positioning member 3.
[0026]
Then, the clamp 4 is rotated, and the position of the clamp 4 in the rotational direction is determined by bringing the first flat plate surface 43 of the clamp 4 into contact with the end surface 33 a parallel to the axial direction of the mounting positioning member 3.
[0027]
As described above, according to the muffler mounting structure of the embodiment having the above-described configuration, the second end surface 32 of the mounting positioning member 3 abuts on the muffler main body side end surface 52 of the tail tube 5, and the outlet pipe 2 is inside the tail tube 5. The amount of insertion can be accurately determined.
[0028]
Further, the first end face 31 of the mounting positioning member 3 is in contact with the end face 41 of the clamp 4 on the muffler main body side to facilitate positioning of the outlet pipe 2.
[0029]
Further, an end surface 33 a formed in the projection 33 of the mounting positioning member 3 and parallel to the axial direction abuts on the first flat plate surface 43 of the clamp 4, thereby causing the outlet pipe 2 in the circumferential direction (rotation direction). Easy positioning.
[0030]
Referring to FIG. 8, a concave portion 36 is formed in the muffler main body side end surface 34 of the mounting positioning member 3, which is notched in the rear direction (direction away from the muffler main body).
As shown in FIG. 9, the recess 36 is formed so as to receive the positioning rod-like member B.
As described above, it is desirable that the end face 34 near the muffler body and the end face 35 far from the muffler body of the mounting positioning member 3 are preferably configured to have complementary shapes. In this case, the recess 36 has a shape complementary to the protrusion protruding toward the tail tube.
[0031]
When welding the mounting positioning member 3 to the outlet pipe 2 of the muffler 1, the positioning rod-shaped member B is brought into contact with the deepest portion of the recess 36 of the mounting positioning member 3, and the tip of the positioning rod-shaped member B is moved. It abuts on the outlet pipe 2.
In this state, the positioning rod-like member B is parallel to a plane including the outer edge of the rear end of the muffler main body 1A.
[0032]
Here, a rectangular member Ba is fixed to the positioning rod-like member B. And in the above-mentioned state, it is comprised so that the farthest end part Bb from the main body of the rod-shaped member of the said rectangular member Ba may contact the rear surface 1Ar of the muffler main body 1A without a gap.
[0033]
When the positioning rod-like member B is configured in this manner, the mounting positioning member 3 can be accurately positioned with respect to the outlet pipe 2.
[0034]
The illustrated embodiment is merely an example, and does not limit the technical scope of the present invention. For example, the embodiment can be applied to a connection between the muffler inlet pipe side and the front tube.
[0035]
【The invention's effect】
The effects of the present invention will be described below.
(A) The first end surface on the longitudinal tail tube side of the attachment positioning member abuts on the first end surface on the longitudinal muffler side of the clamp, thereby facilitating positioning of the rear outlet pipe.
Therefore, the amount of insertion of the tail tube into the muffler side is determined, and leakage of exhaust gas due to insufficient insertion can be prevented.
(B) The muffler side end face of the mounting positioning member and the rear side end face of the muffler have complementary shapes, and can be easily positioned when the mounting positioning member is fixed (for example, welded) to the outlet pipe of the muffler.
(C) Since the positioning rod-shaped member is formed in the concave portion of the mounting positioning member, the positioning can be easily performed when the mounting positioning member is fixed (for example, welded) to the outlet pipe of the muffler.
(D) Since the tail tube can be accurately and easily positioned with respect to the muffler, the assembly time can be shortened.
[Brief description of the drawings]
FIG. 1 is a three-dimensional view before assembly showing a configuration of an embodiment of the present invention.
2 is a three-dimensional view at the completion of assembly corresponding to FIG. 1;
FIG. 3 is a plan view before assembly showing the configuration of the embodiment of the present invention.
4 is a plan view of the assembled state corresponding to FIG. 3; FIG.
FIG. 5 is a side view of the rear part of the muffler according to the embodiment of the present invention.
6 is a plan view corresponding to FIG. 5. FIG.
FIG. 7 is a front view corresponding to FIG. 5;
FIG. 8 is a development view of a mounting positioning member that is a part of the embodiment of the present invention.
FIG. 9 is a side view when a positioning rod-like member is used in the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Muffler 2 ... Outlet pipe 3 ... Mounting positioning member 4 ... Clamp 5 ... Tail tube 31 ... 1st end surface 32 ... 2nd end surface 33 ... Protrusion Part B ... Rod-shaped member for positioning

Claims (3)

A mounting positioning member is installed on the outlet pipe of the muffler, and the mounting positioning member forms a first end surface and a second end surface on the longitudinal tail tube side, and the first end surface on the longitudinal tail tube side Is configured to contact the first end surface of the clamp on the longitudinal muffler body side to position the outlet pipe, and the second end surface on the longitudinal direction tail tube side contacts the end surface on the muffler body side of the tail tube. The outlet pipe is configured to adjust the amount of insertion when it is inserted into the tail tube, and a protruding portion protruding to the tail tube side is formed, and a circumferential end surface is formed on the protruding portion. And the circumferential end face is in contact with the circumferential end face of the clamp to position the outlet pipe in the circumferential direction. Muffler mounting structure. The muffler mounting structure according to claim 1, wherein an end surface of the mounting positioning member close to the muffler body and an end surface far from the muffler body have a complementary shape. The muffler body end face of the mounting positioning member is formed with a recess notched in the rear direction, and the recess is formed to receive a positioning rod-shaped member. Mounting structure.

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