JP2579458Y2 - Exhaust pipe joint structure for vehicles - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of a vehicle exhaust pipe for connecting exhaust pipes of a vehicle .

[0002]

2. Description of the Related Art Conventionally, as a joint structure for connecting exhaust pipes of a vehicle, for example, as shown in FIG. 7, a flange 5 welded to the outer periphery of each connection end of two exhaust pipes 1 and 3 to be connected. A gasket 9 is interposed between the two flanges 5,7.
8 or, as shown in FIG. 8, the connection end 1 of the exhaust pipe 11 of one of the exhaust pipes 11 to be connected.
The large-diameter portion 15 is formed by expanding the diameter of the large-diameter portion 15a.
The connection end 13a of the exhaust pipe 13 is fitted to the nut 2 and the outer periphery of this fitting portion is screwed to the U-bolt 17 and the support 19, and the screw 2a of the U-bolt 17 to the screw portion 17a.
1 and the like are widely known.

In Japanese Utility Model Application Laid-Open No. 61-54583,
As shown in FIGS. 9 and 10, an exhaust pipe 27 having a spherical bulging end 25 and an exhaust having a funnel-shaped flared end 29 covering a part of the outer peripheral surface of the spherical bulging end 25. Tube 31
A joint structure of an exhaust pipe is disclosed, which comprises a tightening band 35 covering the circumference of the butted portion of the two exhaust pipes 27 and 31 and having a step 33 in the middle.

[0004]

[Problem to be Solved by the Invention] As one means for achieving low pollution and high fuel efficiency due to recent environmental problems and resource problems, the weight of the vehicle has been reduced. Thinning is desired.

However, in the joint structure shown in FIG. 7, since the flanges 5 and 7 must be welded to the outer circumferences of the exhaust pipes 1 and 3, it is difficult to make the exhaust pipes 1 and 3 thinner. ,
There is a problem that cracks are generated by intergranular corrosion by welding.

In the conventional structure shown in FIG.
13 can be made thinner, but as a result of being tightened by the fastener 23, the connection ends 11a, 13a of the exhaust pipes 11, 13 are formed.
However, there is a disadvantage that the exhaust pipes 11 and 13 from which the fastener 23 has been removed cannot be used again.

In the joint structure shown in FIG. 9,
The exhaust pipe 27 is provided with a spherical bulging end 25, and the exhaust pipe 27,
Since the connecting portion 31 has a spherical shape, the strength of the connecting portion is improved as compared with the structure shown in FIG.
It has been pointed out that the exhaust pipes 27 and 31 are similarly deformed when tightened at 5.

The present invention has been devised in view of the above circumstances, and eliminates welding to the exhaust pipe, which contributes to intergranular corrosion, thereby making it possible to reduce the thickness of the exhaust pipe and to provide a vehicle with excellent strength . An object of the present invention is to provide a joint structure for an exhaust pipe.

[0009]

In order to achieve the above object, a joint structure of a vehicle exhaust pipe according to the present invention has a substantially bowl-shaped joint having an opening facing outward at each connection end. Two formed exhaust pipes, and an annular metal seal made of a plate material fitted and arranged in both connection ends of the exhaust pipes and formed in a shape and size to be in close contact with the inner peripheral surfaces of the two joints. member and, the seal and cylindrical metal seal pressing member which is secured to both the exhaust pipe on the same axis as the inner periphery of the member, the both connection end portions fastening band Toka Ranaru fitted and disposed on the outer periphery of the Things.

[0010]

According to the present invention, since the seal member is in close contact with the inner peripheral surfaces of both joint portions, the seal member ensures the sealing performance of the exhaust pipe connection portion, and the seal member is welded to the seal pressing member. Therefore, even when the exhaust pipes are connected to each other by tightening the tightening band, the seal member does not spread and adheres tightly to both joints to prevent deformation.

[0011] The seal holding member is used to exhaust air such as eddy currents.
Of the exhaust gas, and the exhaust gas in the exhaust pipe flows down smoothly.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a first embodiment of a joint structure according to the present invention. In the figure, reference numerals 37 and 39 denote exhaust pipes for two vehicles to be connected, respectively, on the connection end portions 37a and 39a side. Is flared to form a conical shape. The connecting end portions 37a and 39a are formed with substantially bowl-shaped joining portions 41 and 43 with the opening portions facing outward, respectively.
1, 43 are arranged so as to abut each other, and have a shape in which an annular bead is provided at a connection portion of the exhaust pipes 37, 39.

As shown in FIGS. 1 and 2, inside the two connection ends 37a and 39a, the two joints 41 and 43 are provided.
An annular metal seal member 47 made of a plate material in which a bead portion 45 is formed in the circumferential direction so as to be in close contact with the inner peripheral surface of
The exhaust pipes 37 and 39 are fitted and arranged with the same size as the inner diameter of the exhaust pipes 37 and 39.

As shown in FIGS. 1 and 3, a cylindrical metal member for preventing generation of abnormal noise due to exhaust gas is provided on the inner periphery of the cylindrical portion 48 of the seal member 47 with the bead portion 45 interposed therebetween. A seal pressing member 49 is welded on the same axis as the two exhaust pipes 37 and 39.

That is, since the seal member 47 made of a plate member is provided with the bead portion 45 protruding outward as described above, if the seal pressing member 49 is not attached,
Part of the exhaust gas passing through the exhaust pipes 37 and 39 is swirled in the bead portion 45 to generate abnormal noise ,
Pressure loss occurs. Therefore, in this embodiment, the seal holding member 4 is provided on the inner periphery of the cylindrical portion 48 of the seal member 47.
9 Ri it to welding, is obtained by preventing the occurrence of pressure loss of the noise and the engine to prevent the inflow of exhaust gas to the bead portion 45. Also, as will be described later, Such more seal pressing member 49 that is welded to the cylindrical portion 48 of the seal member 47, is prevented deformation of at the seal member 47 during tightening of the joint 41, 43 I have.

Reference numeral 51 denotes a tightening band which is fitted to the outer peripheral surfaces of the joints 41 and 43 and tightens them.
As shown in FIG. 3, the tightening band 51 is connected to both joints 4.
The pair of split tightening bands 51a, 51b are formed at the both ends thereof as shown in FIG. By tightening the bolts 53 provided respectively, the joints 41 and 43 can be tightened.

Then, each of the divided tightening bands 51a, 51b
A bead portion 55 is formed along the longitudinal direction so as to be in close contact with the outer peripheral surfaces of the joint portions 41 and 43, and its side edge is bent into a substantially L-shaped cross section as shown in FIG. Thus, a reinforcing flange 57 is provided. In addition, in FIG.
9 is a tightening bolt, 61 is a nut, and 63 is a washer.

Since the joint structure according to the present embodiment is constructed as described above, to connect the two exhaust pipes 37 and 39,
First, a seal member 47 with a seal pressing member 49 welded to the inner periphery is fitted and arranged in the joint 41 of one exhaust pipe 37, and then both the seal members 47 are fitted in the other exhaust pipe 39. The seal members 47 are brought into close contact with the inner peripheral surfaces of the joints 41 and 43 by abutting the connection ends 37a and 39a. Next, the split tightening band 5 is provided on the outer peripheral surface side of both joint portions 41 and 43.
If the bolts 1a and 51b are fitted to each other and the bolt fastening portions 53 are bolted, the joints 41 and 43 are fastened by the fastening band 51 and the exhaust pipes 37 and 39 are connected. Becomes

Since the exhaust pipes 37 and 39 are connected in this manner, the bead portion 45 of the seal member 47 comes into close contact with the inner peripheral surfaces of both the joint portions 41 and 43. The sealing property of the connection part of the pipes 37 and 39 is ensured. Also, the sealing member 47
Since the cylindrical portion 48 is welded to the seal pressing member 49 with the bead portion 45 interposed therebetween, even if the tightening band 51 is bolted, the seal member 47 does not spread and adheres to both the joint portions 41 and 43. The deformation of the seal holding member 4
9 prevents it.

Also, as described above, the seal holding member 4
9 prevents the exhaust gas from flowing into the bead portion 45, thereby preventing generation of abnormal noise due to eddy currents, and also prevents pressure loss to the engine.

As described above, in this embodiment, the exhaust pipes 37, 3
9 can be connected without any welding, so that according to the present embodiment, the exhaust pipes 37 and 39 can be made thinner and there is no fear of intergranular corrosion.

Further, according to the present embodiment, the exhaust pipes 37, 3
9 with the fastening band 51
Also, the deformation of both joint portions 41 and 43 by the seal member 47
Is prevented, so the strength of the connection part is improved
And exhaust pipes 37 and 39 can be reusedBecomes
Further, according to this embodiment, the seal fixed to the seal member 47 is provided.
Retainer 49ButTo prevent exhaust turbulence such as eddies
Noise and engine pressure loss.
The Rukoto.

FIGS. 5 and 6 show a second embodiment of the present invention. In the drawings, reference numerals 65 and 67 denote exhaust pipes for two vehicles to be connected, respectively, similarly to the exhaust pipes 37 and 39. Connection end 6
The 5a and 67a sides are flared and formed in a conical shape. The connection ends 65a and 67a are respectively formed with substantially bowl-shaped joints 69 and 71 having openings facing outward, and the other exhaust pipe 67 is provided with the other exhaust pipe 67 inside the joint 71. By inserting the joint 69 of the tube 65,
It has a shape in which an annular bead is provided at a connection portion between the exhaust pipes 65 and 67.

An annular metal sealing member 75 made of a plate material having a bead 73 formed on the inner surfaces of both wrapped joints 69 and 71 on the inner sides of both connection ends 65a and 67a. Are fitted and arranged with the same size as the inner diameter of both exhaust pipes 65 and 67.

In this embodiment, the sealing member 7
A seal pressing member 49 is welded to the inner periphery of the cylindrical portion 77 of the fifth tube 5 on the same axis as the two exhaust pipes 65 and 67 with the bead portion 73 interposed therebetween. By welding to the cylindrical portion 77 of the
The deformation of the seal member 75 at the time of tightening the components 9 and 71 is prevented, and the flow of exhaust gas into the bead portion 73 is eliminated, thereby preventing the generation of abnormal noise and engine pressure loss .

Reference numeral 79 denotes a joint 69 between the exhaust pipes 65 and 67.
The tightening band 79 is a pair of split tightening bands 79a, 7a similar to the tightening band 51 in the first embodiment.
9b.

Then, each of the divided tightening bands 79a, 79b
In addition, a bead portion 81 covering the outer peripheral surfaces of both the joint portions 69 and 71
Are formed along the longitudinal direction, respectively. However, in order to improve the tightening force per unit area of the tightening band 79, in this embodiment, as shown in FIGS. By forming two bead portions 83 and 85 in the longitudinal direction,
The joints 69, 71 of the exhaust pipes 65, 67 are fastened by the tightening band 79.
And the exhaust pipe 65,
It is a structure that tightens three locations to the 67 flare portion.

In the drawing, reference numeral 87 denotes each of the divided tightening bands 7.
Reinforcing flanges provided on the side edges of 9a and 79b, and 89 is a bolt fastening portion. Since the joint structure according to the second embodiment is configured as described above, in order to connect the two exhaust pipes 65 and 67, first, a seal member 75 in which a seal pressing member 49 is welded to the inner periphery of one of the exhaust pipes is used. After the fitting is arranged in the exhaust pipe 65, the joint 6 of the exhaust pipe 65 is inserted into the joint 71 of the exhaust pipe 67 while the sealing member 75 is fitted in the other exhaust pipe 67.
9 is wrapped and inserted, and the sealing member 75 is
9 and 71 are brought into close contact with the inner peripheral surface. Next, both joints 6
The split fastening bands 79a and 79b are respectively fitted and arranged on the outer peripheral surface side of the components 9 and 71, and these bolt fastening portions 89 are tightened by bolts. And the two exhaust pipes 65 and 67 are connected.

Since the exhaust pipes 65 and 67 are connected in this way, the bead 73 of the seal member 75 comes into close contact with the inner peripheral surfaces of the joints 69 and 71, and the exhaust is performed by the seal member 75. The sealing performance of the connecting portion of the pipes 65 and 67 is ensured, and the sealing member 75 is welded to the seal pressing member 49 with the bead portion 73 interposed therebetween. However, the sealing member 75 does not spread and
9, 71 to prevent deformation.

Further, as described above, the seal holding member 4
9 prevents the exhaust gas from flowing into the bead portion 73, thereby preventing generation of abnormal noise due to eddy currents, and also prevents pressure loss to the engine.

As described above, according to the present embodiment, the exhaust pipes 65 and 67 can be connected to each other without any welding.
Since the deformation of 71 is prevented, as in the first embodiment,
It is possible to achieve the intended purpose.

Further, according to the present embodiment, the fastening band 79
In order to improve the tightening force per unit area of the bead portion 81, two bead portions 83 and 85 are further formed in the bead portion 81 in the longitudinal direction, and a lap portion of the joint portions 69 and 71 of the exhaust pipes 65 and 67 and Since the three portions from the joints 69, 71 to the flare portions of the exhaust pipes 65, 67 are tightened with the tightening band 79, the tightening force of the tightening band 79 is improved as compared with the first embodiment. As a result, the sealing performance is further improved, and the sealing performance can be ensured even if the accuracy of the components is slightly low.

In the first and second embodiments, the tightening bands 51, 79 are respectively replaced by a pair of split tightening bands 51a, 51a.
b, 79a, 79b, and the bolted portions 53, 89 provided at both ends are bolted to tighten the connection portions of the exhaust pipes 37, 39, 69, 71. The shapes of the bands 51 and 79 are not limited to those in the above-described embodiments.
A tightening band having a shape like a U-shaped clamp may be used, or the split tightening bands 51a, 51b, 79 may be used.
a, 79b, one of the bolt tightening portions 53, 89 may be a plug-in structure, and the bolt may be tightened at one place. With these tightening bands, the intended purpose can be achieved as in the above embodiments. Is possible.

[0034]

[Effects of the Invention] As described above, for the vehicle according to the present invention .
According to the joint structure of the exhaust pipe, these can be connected without performing any welding to the exhaust pipe, so that the exhaust pipe can be made thinner and there is no fear of intergranular corrosion.

In addition, according to the present invention, even if the joint of the exhaust pipe is tightened with the tightening band, the deformation of the joint is prevented by the seal member, so that the strength of the joint is improved as compared with the related art. At the same time , the exhaust pipe can be reused . or,
According to the present invention, the seal holding portion fixed to the seal member
Since the material prevents turbulence in exhaust such as eddy currents,
It is possible to prevent engine pressure loss from occurring.
You.

[Brief description of the drawings]

FIG. 1 is a sectional view of a joint structure of a vehicle exhaust pipe according to a first embodiment of the present invention.

FIG. 2 is a side view of the seal member.

FIG. 3 is a sectional view taken along line III-III of FIG.

FIG. 4 is a plan view of the joint structure shown in FIG. 1;

FIG. 5 is a sectional view of a joint structure of a vehicle exhaust pipe according to a second embodiment of the present invention.

6 is a plan view of the joint structure shown in FIG.

FIG. 7 is a side view of a joint structure of a conventional vehicle exhaust pipe.

FIG. 8 is a side view of a conventional joint structure for a vehicle exhaust pipe.

FIG. 9 is a sectional view of a conventional joint structure for a vehicle exhaust pipe.

FIG. 10 is a perspective view of a conventional joint structure for a vehicle exhaust pipe.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16L 23/04 F01N 7/08 F16L 21/06

Claims (1)

(57) [Scope of request for utility model registration] 1. Each connecting end (37a, 39a, 65a,
67a), two exhaust pipes (37, 39, 65, 67) each having a substantially bowl-shaped joint (41, 43, 69, 71) having an opening facing outward, and an exhaust pipe (37). , 39,
65, 67) (37a, 39a, 65a,
67a), the two joints (41, 4)
3, 69, 71), and an annular metal seal member (47, 75) made of a plate material having a shape and a size closely contacting the inner peripheral surface of the seal member (47, 75). A cylindrical metal seal holding member (49) fixed coaxially with the exhaust pipe (37, 39, 65, 67);
And both connection ends (37a, 39a, 65a, 67)
Tightening bands (51, 79) fitted and arranged on the outer periphery of a)
And a joint structure for a vehicle exhaust pipe.