JPH1193657A - Pipe coupling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe coupling device capable of being bent while holding airtightness, capable of preventing breakage and deterioration of parts caused by heat, being miniaturized and reducing costs. SOLUTION: A partition wall 2a on the upstream side and a partition wall 6a on the downstream side are arranged close to each other so as to be bent. A first inner pipe 9 is provided on the sides of upstream pipes 3, 4, and a second inner pipe 10 is provided on the sides of downstream pipes 7, 8. The tips of both inner pipes 9, 10 are lapped on each other, and a bellows 13 is arranged on the outer peripheries of both inner pipes 9, 10. A cover 14 is arranged on the outer periphery of the bellows 13. In the cover 14, a flange 14a, a cover part 14b and a spherical contracted-diameter part 14d are integrally formed. A sliding member 16 is arranged in the spherical contracted-diameter part 14d and held by a holder 15 fixed to the inner pipe 10. The sliding member 16 is pressed in the direction of the spherical contracted-diameter part 14d by an energizing member 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pipe joint device.

[0002]

2. Description of the Related Art Conventionally, two upstream pipes partitioned by a partition wall and arranged side by side are connected to two downstream pipes partitioned by a partition wall and arranged side by side. There are fittings that absorb vibration.

As such a pipe joint, for example, two exhaust manifolds 101 and 103 of an engine 100 for an automobile or the like as shown in FIG. 7 are connected to two exhaust pipes 106 and 107 via a pipe joint 105. Also, it is used when the other two exhaust manifolds 102, 104 are connected to the two exhaust pipes 108, 109 via the pipe joint 110.

FIGS. 8 and 9 show examples of the structure of the pipe joints 105 and 110.
No. 84122. This conventional structure will be described.

FIG. 8 shows a connection structure between the two exhaust manifolds 101 and 103 and the exhaust pipes 106 and 107. Two exhaust manifolds 101, 10
3 are provided in parallel by being partitioned by a partition wall 111, and a flange 112 is integrally formed on the outer periphery. The flange 1
A sliding surface 112a formed of a conical surface is formed on the inner peripheral portion of 12.

[0006] The two exhaust pipes 106 and 107 are connected to the partition wall 11.
3 and are provided in parallel, and a flange 114 is fixedly provided on the outer periphery thereof. The flange 114 has a conical surface 1 whose outer peripheral surface is slidably fitted to the sliding surface 112a.
An annular member 115 having 15a is provided. Further, the flange 114 is provided with a tightening collar 116.

A bolt 117 is erected on the flange 112, the tightening collar 116 is loosely fitted to the bolt 117, and a spring 118 is interposed between the head of the bolt 117 and the tightening collar 116 by compression. A coupling mechanism is provided, and the annular member 115 is pressed against the sliding surface 112a by a spring 118, and the exhaust manifolds 101 and 103 and the exhaust pipes 106 and 1 are pressed.
07 is connected so as to be relatively bendable.

Reference numeral 119 denotes a partition plate formed of a highly rigid metal plate. The partition plate 119 is arranged between the exhaust manifold-side partition wall 111 and the exhaust pipe-side partition wall 113 in series with the partition wall, and has a downstream side portion. 119a is fitted and held on the exhaust pipe side partition wall 113, and the upstream end face 119b is in contact with the end face 111a of the exhaust manifold side partition wall 111.

Further, the end face 111a of the partition wall 111 on the exhaust manifold side and the upstream end face 1 of the partition plate 119
19b is formed in an arc shape as shown in FIG. 9 in the front and back direction of the paper surface of FIG. 8, and this arc direction A is a rolling direction centered on a roll shaft (crank shaft) 120 of the engine 100 shown in FIG. A.

[0010]

In the above conventional structure, the conical surface 115a of the annular member 115 and the flange 112
There is a problem that the exhaust gas leaks at the sliding portion with the sliding surface 112a, and there is a concern that the performance of the engine may be deteriorated and the exhaust gas may flow out to the atmosphere.

As a structure for preventing such an exhaust gas leak, for example, a structure as shown in FIG. 10 is disclosed in Japanese Utility Model Publication No. 3-30579. This FIG.
The upstream pipe 201 and the downstream pipe 202 are connected by a bellows 203, and a front cover 204 fixed to the front side of the bellows 203 and an outer peripheral cover 205 fixed to the rear side of the bellows 203 are formed by a gasket 206 and bolts. 20
7, a nut 208 and a spring 209, and a gasket 2 is attached to a rear cover 210 fixed to the rear side of the bellows 203 and the outer peripheral cover 205.
The bellows 203 prevents the exhaust gas from leaking.

However, the structure shown in FIG. 10 cannot be used as a pipe joint for connecting a plurality of upstream pipes and downstream pipes as shown in FIGS. Further, in any of the above-mentioned pipe joints, there is a connecting mechanism including a flange protruding from the outer peripheral portion and a bolt and a biasing member for connecting the flange, so that the outer shape of the pipe joint becomes large, and the mountability to a vehicle is increased. There are problems that will be compromised. Especially,
In the case where a plurality of flow pipes are connected to each other, the pipe itself has a large diameter, so that a further increase in size is unavoidable, which becomes a more serious problem.

Accordingly, the present invention provides a method of connecting pipes having a plurality of flow paths so as to bend in all directions while maintaining a certain degree of airtightness of the flow paths and complete airtightness with the atmosphere. It is an object of the present invention to provide a pipe joint device that can solve the above problems.

[0014]

In order to solve the above-mentioned problems, a first aspect of the present invention is directed to a first aspect of the present invention, in which a plurality of upstream pipes partitioned by a partition wall and arranged side by side are partitioned by the partition wall. And a plurality of downstream pipes arranged side by side, a pipe joint device for connecting the end portions of the upstream and downstream partition walls to bendable and bendable.
The other ends are respectively fitted around the outer periphery of the downstream pipe, and a cover is arranged outside the bellows. The cover is integrally formed with a flange at one end of the cover and a spherical shrink at the other end. The bellows is formed integrally with the bellows, and is fixed by being externally fitted to one end of the bellows, and an annular sliding member is positioned on the other end of the bellows inside the reduced diameter portion. An urging member which is fitted and fixed and which presses the sliding member against the reduced diameter portion is arranged in the cover.

According to the present invention, the connection between the upstream partition wall and the downstream partition wall can be bent in all directions while maintaining a certain degree of airtightness between the parallel flow paths.
Further, the presence of the bellows makes it possible to bend the pipe in all directions while completely preventing the fluid flowing through the pipe from leaking to the atmosphere.

Further, since the cover is formed integrally with the flange portion, the cover portion and the reduced diameter portion, a connecting mechanism outside the cover as in the conventional case is not required, and a protruding part to the outer peripheral portion of the cover is not required. Disappears.

According to a second aspect of the present invention, in the first aspect, a first inner pipe is externally fitted on the upstream pipe side, and one end of a bellows is attached to the first inner pipe. The second inner pipe is externally fitted to the downstream pipe side, the other end of the bellows is externally fitted to the second inner pipe, and the holder is removed from the bellows end on the reduced diameter side of the cover. The holder is provided with a sliding member externally fitted thereto, and the tip of the first inner pipe and the tip of the second inner pipe are wrapped with the former inside and with a gap. It is a thing.

In the present invention, both inner pipes are arranged inside the bellows, and the inner pipe on the upstream side is wrapped inside the inner pipe on the downstream side. For example, when the fluid is high-temperature exhaust gas, The gas flow flows without hitting the bellows, and damage and deterioration of the bellows due to the high-temperature gas can be prevented.

Further, since the sliding member is also held via the holder, the conduction of heat from the inner pipe to the sliding member is alleviated by the holder, thereby preventing damage and deterioration of the sliding member due to heat. .

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described based on an embodiment shown in FIGS. 1 to 4 show a first embodiment.

The upstream pipe 1 has a partition wall 2 in the body in the axial direction, and has a plurality of, in the example shown, two upstream pipes 3 and 4 in parallel. As a method for forming the upstream pipe 1, for example, a pipe 1a having a semicircular cross section and a pipe 1b having a semicircular cross section may be formed as shown in FIG.

Similarly to the upstream pipe 1, the downstream pipe 5 is also provided with a plurality of, in the example shown, two upstream pipes 7, 8 by a partition wall 6.
In parallel. The partition wall 6 is arranged on the same plane as the partition wall 2.

A first inner pipe 9 is externally fitted and fixed to the outflow-side ends of the upstream pipes 3 and 4 and protrudes in the downstream direction. A second inner pipe 9 is provided at the inflow-side ends of the downstream pipes 7 and 8. 10 is externally fitted and fixed and protrudes in the upstream direction. The downstream end of the first inner pipe 9 and the second inner pipe 10
The upstream end is reduced in diameter, and the upstream first
Of the tip portion of the second inner pipe 10 of the front portion and the downstream side of the inner pipe 9, and to position the former inside, and is polymerized with a gap D ₁ of the predetermined dimension (lap).

The first inner pipe 9 has a partition wall 2a.
Are fixed on the same plane as the partition wall 2 and in a continuous state, and the second inner pipe 10 has a partition wall 6a.
Are fixed on the same plane as the partition wall 6 and in a continuous state. The downstream end of the one partition wall 2a has a cross section perpendicular to the plane of the partition wall 2a in FIG.
As shown in FIG. Then, it constitutes a connecting portion 12 by inserting the upstream end 6b of the two pieces 12a, the other partition walls 6a into the gap D ₂ between 12b forming the crotch shape. Then, the rotation about the rotation center O of the E-E direction of both the partition walls 2,6 by the presence of the gap D _2, i.e., the bending of E-E direction of the upstream tube 3, 4 and the downstream pipe 7,8 Making it possible. Furthermore, and also allows movement of tube axis direction of the upstream tube 3, 4 and a downstream pipe 7,8 by a gap D ₃ parts.

Further, the partition wall 2 at the connection portion 12
a, 6a plane direction of the cross-section of the (X-X line cross section of FIG. 1) is formed as shown in FIG. 3, around the rotational center O by the presence of the gap D ₃ both the partition walls 2a, 6a of F- Rotation in the F direction, that is, FF of the upstream pipes 3, 4 and the downstream pipes 7, 8
Direction bending is possible.

A bellows 13 is arranged on the outer periphery of the first inner pipe 9 and the second inner pipe 10 in the pipe axis direction, and one end 13a of the bellows 13 is provided at the base of the first inner pipe 9. Externally fitted and fixed, other end 13
b is externally fitted and fixed to the base of the second inner pipe 10, and the bellows 13 keeps the inner pipes 9, 10 and the inner pipes 9, 10 while maintaining airtightness with the atmosphere.
In all directions and movement in the tube axis direction.

A cover 1 is provided on the outer periphery of the bellows 13.
4 are arranged. The cover 14 has an annular flange portion 14 a externally fitted and fixed to one end portion 13 a of the bellows 13.
And a side wall 14b raised from the flange portion 14a;
An enlarged cylindrical cover portion 14c and a reduced diameter portion 14d having a spherically reduced diameter at the tip of the cover portion 14c are integrally formed. Further, the spherical inner surface 14e of the reduced diameter portion 14d.
Is formed on a spherical surface having a radius R about the rotation center O set near the connection portion 12.

The cover portion 14c has a heat radiating hole 14f formed in a slit shape in the tube axis direction, and a plurality of heat radiating holes 14f are formed in the circumferential direction of the cover portion 14c. A holder 15 is fixed to the outer peripheral surface of the other end 13b of the bellows 13 by externally fitting an annular base 15a thereof, and a rising piece facing the inside of the reduced diameter portion 14d of the cover 14 is fixed to the annular base 15a. 15b are integrally formed.

A sliding member 16 is fixed to the outer surface of the holder 15. The sliding member 16 is formed in an annular shape around the pipe axis of the inner pipe 10 and has a sliding surface 1 facing the reduced diameter portion 14 d of the cover 14.
6a is formed as a spherical surface along the spherical inner surface 14e of the reduced diameter portion 14d.

In the gap 17 between the bellows 13 and the cover 14, an elastic member serving as a biasing member, in the illustrated embodiment, a coil spring 18 is interposed between the side wall 14b of the cover 14 and the rising wall 15b of the holder 15. Has been
The sliding member 16 is urged in the direction of the reduced diameter portion 14d together with the inner pipe 10 and the holder 15 by the urging force of the urging member 18.

Next, the operation when the pipe joint device of the first embodiment is used in an exhaust system of an engine as shown in FIG. 7 will be described. In this case, one upstream pipe 3 is used as one exhaust manifold 101 shown in FIG. 7, the other upstream pipe 4 is used as the other exhaust manifold 103, and one downstream pipe 7 is used as one exhaust pipe 106 shown in FIG. The other downstream pipe 8 is the other exhaust pipe 107.

In this state, the upstream pipes 3, 4 and the downstream pipes 7, 8
When a bending force in the EE direction shown in FIG. 1 acts on the inner surface of the cover 14, the spherical inner surface 14e of the cover 14 and the spherical sliding surface 16a of the sliding member 16 slide with each other. It bends in the EE direction. At this time, the urging force of the urging member 18 causes the two surfaces 14e and 16a to be pressed and slid, so that the sliding friction force becomes a damping force. Also, its EE
When bending in the direction, a gap D ₁ is formed in the overlapping portion of the inner pipes 9 and 10, and the gap D is also formed in the connecting portion 12.
_Due to the formation of ₂ , the bending is performed without any trouble.

The bending in the direction FF shown in FIG.
Even in the above EE direction, the spherical inner surface 14e and the spherical sliding
The surfaces 16a slidably contact each other, but in this case,
Gap D _ThreeIs bent without any hindrance by the presence of
You.

The upstream pipes 3 and 4 and the downstream pipes 7 and 8 are shown in FIG.
When a force in the direction of the tube axis acts as indicated by an arrow G, the sliding member 16 separates from the reduced diameter portion 14d and compresses the urging member 18. The urging force of the urging member 18 against this compression becomes the damping force. At this time, since the gap D ₃ is formed in the connecting portion 12, movement of the tube axis direction is carried out without any problem.

The bellows 13 also bends and expands and contracts following the bending in all directions and the movement in the axial direction. In this case, the bellows 13 also causes the inner pipes 9 and 1 to move.
Complete airtightness between the zero part and the outside (atmosphere) is maintained, exhaust gas is prevented from leaking out of the device, and deterioration in performance of the internal combustion engine and outflow of exhaust gas to the atmosphere are prevented.

In the connecting portion 12 between the upstream partition wall 2a and the downstream partition wall 6a, the upstream end of the downstream partition wall 6a is located between the crotch-like pieces 12a and 12b from the upstream side to the downstream side. Since the part 6b is inserted, the exhaust gas in one flow path, for example, 3 is prevented from leaking to the other flow path, for example, on the 8 side, and the performance of the internal combustion engine is prevented from deteriorating.

Further, both inner pipes 9 and 10 are arranged inside the bellows 13 and the front end of the first inner pipe 9 on the upstream side is wrapped inside the front end of the second inner pipe 10 on the downstream side. Since the exhaust gas is disposed, the exhaust gas flows without hitting the inner surface of the bellows 13, thereby preventing the bellows 13 from being damaged or deteriorated by the high-temperature gas.

Further, since the sliding member 16 is held via the holder 15, the conduction of heat from the second inner pipe 10 to the sliding member 16 is reduced, and the sliding member 16 is damaged by heat conduction. And deterioration are prevented.

Further, the heat generated in the gap 17 between the bellows 13 and the cover 14 due to the exhaust heat is radiated to the outside through the heat radiation holes 14f formed in the cover 14. for that reason,
Exhaust heat causes heat to remain in the gap 17, and the high heat can prevent the coil spring 18, which is an urging member, from sagging.

Further, tuning for adjusting the pressing force of the sliding member 16 against the cover 14 to set the characteristics of the pipe joint device as desired can be performed only by changing the urging member 18. In addition, the flange portion 14a of the cover 14 in the above embodiment.
May be fixed to the second inner pipe 10 side, and the holder 15 holding the sliding member 16 may be fixed to the first inner pipe 9 side. Can demonstrate.

Further, locking portions 18a and 18b as shown in FIG. 5 are formed at both ends of the coil spring 18 so that the locking portions 18a are formed on the side walls 14b of the cover 14.
A hole for fitting and locking the locking portion 18b is formed in the rising piece 15b of the holder 15, and the locking portions 18a and 18b are locked in the holes. The coil spring 18 may be provided. With this configuration, when the two tubes 1 and 5 try to rotate relative to each other about the tube axis, the rotation can be suppressed by the return force of the coil spring 18.
When rotated, the connecting portion 12 can be returned to the proper fitting state shown in FIG.

Further, the gap D ₃ parts of the connecting portion 12 in the above embodiment, as shown in FIG. 6, may be separated by a heat-resistant elastic member 20. The elastic body 20 is desirably a wire mesh having high heat resistance and hermeticity having a density of 2 g to ³ g / cm ³ by compression molding a metal fiber. By interposing such an elastic body 20, the connecting portion 12
Airtightness can be improved.

The present invention is not limited to the exhaust pipe joint as in the above embodiment, but may be applied to a pipe joint device for flowing other fluids.

[0044]

As described above, according to the first aspect of the present invention, the connecting portion of the partition wall is maintained to some extent airtight,
Further, the plurality of upstream pipes and the plurality of downstream pipes can be bent in all directions while maintaining complete airtightness to the atmosphere.

Further, since there is no conventional coupling mechanism on the outer peripheral portion of the cover, the outer diameter of the pipe joint device can be reduced, the mountability on a vehicle or the like is improved, and the weight is reduced by reducing the number of parts. And cost reduction.

According to the second aspect of the present invention, it is possible to prevent the bellows and the sliding member from being damaged or deteriorated by the heat of the high-temperature fluid.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a sectional view taken along line XX in FIG. 1;

FIG. 4 is a sectional view showing an example in which an upstream pipe and a downstream pipe are formed.

FIG. 5 is a side view showing another example of the coil spring as the urging member.

FIG. 6 is an essential part cross-sectional view showing another example of the connecting portion of the partition wall.

FIG. 7 is a perspective view showing an application example of the pipe joint device of the present invention.

FIG. 8 is a sectional view showing a conventional pipe joint device.

FIG. 9 is a sectional view taken along line YY of FIG. 8;

FIG. 10 is a sectional view showing another conventional pipe joint device.

[Explanation of symbols]

2, 2a ... upstream partition wall 3, 4 ... upstream pipe 6, 6a ... downstream partition wall 7, 8 ... downstream pipe 9 ... first inner pipe 10 ... second inner pipe 12 ... connecting part 14 ... cover 14a ... Flange part 14c ... Cover part 14d ... Diameter part 15 ... Holder 16 ... Sliding member

Claims (2)

[Claims] 1. A plurality of upstream pipes partitioned by a partition wall and arranged side by side, and a plurality of downstream pipes partitioned by a partition wall and arranged side by side, the leading ends of the upstream and downstream partition walls are brought close to each other. A pipe fitting device for connecting the bellows so that one end of the bellows is fitted to the outer periphery of the upstream pipe and the other end is fitted to the outer periphery of the downstream pipe, and a cover is arranged outside the bellows. The cover is formed by integrally forming a flange portion at one end of the cover portion and integrally forming a spherical reduced-diameter portion at the other end portion, and is fixed by being externally fitted to one end portion of the bellows by the flange portion. At the other end of the bellows, an annular sliding member is positioned inside the reduced diameter portion and externally fitted and fixed, and an urging member for pressing the sliding member against the reduced diameter portion is disposed in the cover. A pipe joint device characterized by the following. 2. A first inner pipe is externally fitted on an upstream pipe side, one end of a bellows is externally fitted on the first inner pipe, and a second inner pipe is externally fitted on a downstream pipe side. The second inner pipe is fitted with the other end of the bellows outside, the cover is fitted around the bellows end on the reduced diameter side of the cover, and the sliding member is fitted outside the holder. The pipe joint device according to claim 1, wherein the tip of the first inner pipe and the tip of the second inner pipe are wrapped with the former inside and with a gap.