JP3511364B2 - Exhaust pipe connection structure using spherical joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] The present invention relates to a multi-cylinder internal combustion engine
Of exhaust pipes connected to the exhaust manifold
Regarding the tying structure, especially two inside each with a partition plate
The upstream exhaust pipe and the downstream exhaust pipe that are divided into
Exhaust pipe using a spherical joint connected via a face joint
Related to the connection structure. [0002] 2. Description of the Related Art A partition plate has two channels inside.
The upstream and downstream exhaust pipes are divided into spherical joints
Of exhaust pipes using spherical joints connected via
As a prior art related to the structure, Japanese Patent Application Laid-Open No. 9-210272
Is described in Japanese Unexamined Patent Application Publication No. 2000-205,878. [0003] Utilizing the spherical joint described in this publication
The connecting structure of the exhaust pipe is shown in FIGS.
So that the flange 03 fixed to the upstream exhaust pipe 05
Ball between the downstream exhaust pipe 030 and the flange 036
The face joint 040 is interposed, and these flanges 03, 036
Is resilient by bolt 013 via coil spring 041
The upstream exhaust pipe 05 or lower
Vibration generated in the upstream exhaust pipe 030 is absorbed, and both exhaust
The propagation of vibration between the trachea 05 and 030 is cut off
I have. The flange 036 fixed to the downstream side exhaust pipe 030 is
It has an inner peripheral surface 038 that matches the hemisphere of the spherical joint 040.
As a result, the inner peripheral surface 038 slides in contact with the hemispherical surface of the spherical joint. Further, the inside of the upstream exhaust pipe 05 is divided into two flow paths.
At the end of the partition 034, which is divided into
Non-contact at the end of the partition plate 033 that divides the inside into two flow paths
A wrap portion 042 for covering in a state is provided. And this
Ends of both partition plates 034, 033 and end of wrap portion 042
The end contour shapes are concentric as shown in FIG.
It is formed in a circular arc shape. The lap part 042 is
Bent piece 042a straddling the end of the partition plate 033 of the downstream exhaust pipe 030
And a plate-shaped piece 042b. [0005] The spherical joint described in the above publication is used.
The connection structure of the exhaust pipe is configured as described above.
The partition plates 034 and 033 allow the inside of each to flow
Between the upstream exhaust pipe 05 and the downstream exhaust pipe 030
At the connection point, each flow path S of the upstream exhaust pipe 05₁₁, S₁₂
Exhaust gas flowing through the corresponding exhaust passage S of the downstream exhaust pipe_{twenty one}, S
_{twenty two}Other flow path S_{twenty two}, S_{twenty one}
Hardly interfere with the exhaust gas flowing through. Therefore, also
The exhaust gas is supplied to each of the upstream exhaust pipe 05 and the downstream exhaust pipe 030.
It can flow smoothly in the communication flow path,
A decrease in force can be prevented. [0006] Also, the ends of the two partition plates 034, 033 and the
The shape of the tip of the tip 042 is a concentric arc
For example, the upstream exhaust pipe 05 is
As shown by the white arrow in FIG.
Even if a ring is formed, the wrap portion 042 is
0 while maintaining the non-contact state with the end of the partition 033.
Keep covering it. Therefore, the partition plate of the upstream exhaust pipe 05
034 and the wrap portion 042 of the downstream exhaust pipe 030
Noise does not occur because it does not collide with the end of the partition 033.
It does not produce, and it is difficult for exhaust gases to interfere with each other. Further, the end of the partition plate 034 of the upstream exhaust pipe 05
Partition between the wrap section 042 provided in the section and the downstream exhaust pipe 030
A cushioning material can be provided between the end of the plate 033 and this
In this case, the airtightness is increased, so that the exhaust gas interferes with each other.
Can be more reliably prevented. In addition, upstream exhaust
A heavy load is applied to the connection point between the trachea 05 and the downstream exhaust pipe 030.
Wrap part 042 and downstream exhaust pipe 030
The end of the partition 033 is in contact with the cushioning material,
The shock absorbing material absorbs collision energy and generates abnormal noise.
Nothing. Further, the upstream exhaust pipe 05 is also connected to the downstream exhaust pipe.
The trachea 030 is almost identical in appearance to a pipe with a circular cross section.
Therefore, a small installation space is sufficient. Like above
Various effects can be obtained. [0009] SUMMARY OF THE INVENTION However, the public
Exhaust pipe connection structure using spherical joints described in the report
At the end of the partition plate 034 of the upstream exhaust pipe 05.
The wrapped portion 042 is the end of the partition plate 033 of the downstream exhaust pipe 030
Avoid the exhaust gas interference when covering the parts in a non-contact state.
And the wrap portion 042 and the downstream exhaust pipe 03
If a cushioning material is provided between the end of the
If the vibration direction of the upstream and downstream exhaust pipes 05 and 030 is
There was a drawback of getting around. The bent piece 042a constituting the wrap portion 042
And the plate-shaped piece 042b are the ends of the partition plate 033 of the downstream exhaust pipe 030.
Each section of the upstream exhaust pipe 05 and the downstream exhaust pipe 030
Since it is provided in the flow channel, it
Flow resistance is reduced and the smooth flow of exhaust gas is reduced
Had been. [0011] The present invention overcomes the above-mentioned disadvantages.
The inside of each is divided into two channels by a partition plate.
At the connection between the upstream exhaust pipe and the downstream exhaust pipe
Exhaust gas interference can be completely prevented.
Smooth flow, no abnormal noise, and
Spherical surface without any restriction on the vibration direction of the downstream exhaust pipe
To provide a connection structure for exhaust pipes using joints
And [0012] Means and Effects for Solving the ProblemsClaim
1 describedThe present invention provides a spherical joint that solves the above problems.
Related to the exhaust pipe connection structure using
The upstream exhaust pipe is divided into two passages,
A spherical joint connected to the outlet side exhaust pipe via a spherical joint
In the exhaust pipe connection structure used, the upstream exhaust pipe is used.
The tip end of the internal partition plate is connected to the downstream exhaust pipe.
Projecting into the downstream exhaust pipe from the connection end face.
The tip contour shape is formed to be convex in an arc shape,
The partition plate inside the downstream exhaust pipe has
Be sure to follow the contour of the partition plate inside the exhaust pipe on the upstream side.
An arc-shaped recess is formed in the upstream exhaust pipe,
The tip of the plate and the tip of the partition plate inside the downstream exhaust pipe;
In each, a cushioning material is provided, and the tip of the both cushioning materials
The contour shape conforms to the contour shape at the tip of both partition plates.
Are formed in the shape of an arc so that the tip surfaces of both the cushioning members are
Are made to slide in contact with each other,The spherical joint is a hemisphere
Constituted by a gasket having an outer surface formed by
The arc-shaped tip contour shapes of the cushioning members are
When the tip surfaces of the cushioning material slide in contact with each other, the gas
Each of the outer hemispheres on the outer surface of the
And a tip inside the upstream exhaust pipe.
A tip surface of an end portion and a tip portion inside the downstream exhaust pipe
Is the width direction of the partition plate inside the upstream exhaust pipe.
And a direction perpendicular to this and the inside of the downstream exhaust pipe.
Concentric arcs in the width direction of the partition and in the direction perpendicular to it
And the two arc-shaped tip surfaces are in contact with each other.
When moving, the spherical joint of the spherical joint extends on a hemisphere
Formed to be located in eachCharacterized by
Things. The invention described in claim 1 is as described above.
The interior of each is divided by a partition plate
The upstream exhaust pipe and the downstream exhaust pipe divided into two flow paths
Using a spherical joint that is connected via a spherical joint
In the pipe connection structure, the partition plate inside the upstream exhaust pipe and the lower
The partition plate inside the discharge side exhaust pipe is
The contours of the tips of the
At each of these tips, cushioning materials are arranged,
The contour of the tip of each cushioning material also matches the contour of the tip of each partition.
It is formed in an arc shape along each, and the tip of both cushioning materials
The end faces are adapted to slide against one another. As a result, the tip of the partition plate inside the exhaust pipe on the upstream side is
The cushioning material provided at the end and the partition plate inside the downstream exhaust pipe
The shock-absorbing material provided at the distal end makes the upstream exhaust pipe and the downstream
At the connection with the exhaust pipe, two
And the leading ends of both partitions maintain contact.
As it slides while holding it, airtightness increases,
The exhaust gas flowing through each flow path of the exhaust pipe is
Can not flow into any other flow path, and flows through other flow paths.
Interference with the exhaust gas can be completely prevented. Thus, it is possible to completely prevent exhaust gas interference.
In addition to that, the tip surfaces of both cushions are simply
So that they slide in contact with each other.
Since it does not straddle, the thickness dimension can be reduced accordingly
And therefore each of the upstream and downstream exhaust pipes
Since the amount of protrusion in the communication flow path is reduced, exhaust gas
Less resistance to flow, which allows each communication
Exhaust gas flowing through the flow path smoothly flows through these flow paths.
Can be Further, the tip of the partition plate inside the exhaust pipe on the upstream side
And the tip of the partition plate inside the downstream exhaust pipe
They come into contact via the cushioning material provided, and
The tip contour shape of the cutting plate and the tip contour shapes of both cushioning materials are
Since they are formed in an arc shape so as to follow each other, both partition plate surfaces
Rolling of the upstream and downstream exhaust pipes inside
Pitching and yawing in a plane perpendicular to
The direction of vibration of the upstream and downstream exhaust pipes can be sufficiently absorbed
Is not regulated. Also, vibration of the upstream and downstream exhaust pipes
At the time, the tip surfaces of both cushioning materials contact and slide,
The sliding is smooth without generating abnormal noise. Further, the upstream and downstream exhaust pipes and their internal
Assuming that the partition plate is heated by the exhaust gas and thermally expanded
This thermal expansion is absorbed by the shrinkage of both cushioning materials.
This causes thermal distortion and cracks in the upstream and downstream exhaust pipes and each partition plate.
Life can be prevented. In addition, both cushioning materials, both partitions
Since the arc-shaped tip of the plate is protected from wear due to sliding,
These durability can be improved. [0018]Also, the spherical jointOutside formed by hemisphere
Constructed by a gasket with a surface, the circle of both cushioning materials
Each arc-shaped tip contour shape is such that each tip face of both cushioning materials
When sliding in contact, extend the hemisphere on the outer surface of the gasket.
It is made to be located on each hemispherical surface provided. As a result, the upstream exhaust pipe and the downstream exhaust pipe
When the two exhaust pipes vibrate,
Since the moving surfaces are all aligned on the same spherical surface, the structure is simple.
Simplified, easy to manufacture, airtight
While absorbing vibrations in all possible directions more fully
That the vibration direction of both exhaust pipes is regulated
Is further reduced. [0020] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG.
One of the inventions described in claims 1 and 2 of the present application
An embodiment will be described. FIG. 1 illustrates the present embodiment.
Used for connecting exhaust pipes using spherical joints
Correction of exhaust manifold of multi-cylinder internal combustion engine with combined exhaust pipe
FIG. 2 shows a plurality of branch pipes of the exhaust manifold of FIG.
Partially broken plane of the collecting part of the pump and the downstream flange part
FIG. 3, FIG. 3 is a side view seen from the X direction of FIG. 2, and FIG.
2 is a cross-sectional view taken along line IV-IV of FIG.
FIG. 6 is a cross-sectional view of the spherical joint according to the present embodiment.
FIG. 7 is a vertical cross-sectional view of the exhaust pipe connection structure, and FIG.
FIG. 7 is a sectional view taken along the line VII. FIG. 1 shows a spherical joint according to the present embodiment.
Collective exhaust pipe used for connecting exhaust pipes using hands
The exhaust manifold 1 of a multi-cylinder internal combustion engine provided with
In-line four-cylinder, four-stroke internal combustion mounted on uncomfortable passenger cars
Exhaust manifold used in engines, made of steel
An upstream flange 2, a steel downstream flange 3,
Stainless steel exhaust pipe 4-1
4-4 and two semicircular cross section sheet metal stainless steel collective discharge
Trachea 5-1 and 5-2, exhaust pipes 4-1 to 4-4 and collection
Connect the combined exhaust pipes 5-1 and 5-2 to the heat insulating space 7 (see FIGS. 2, 4 and 5).
Stainless steel case)
It has an exhaust manifold 6. On the upstream side flange 2, a diagram of the internal combustion engine is shown.
To the downstream opening of the exhaust port of the cylinder head
Four communicating holes 10-1 to 10-4 connected to each other and the cylinder head
Bolt holes 11 for bolts to be screwed into
Is formed on the downstream flange 3.
An annular convex portion 12 for seating the socket 40, and a downstream
Flange with a spherical seat fixed to the upstream end of the side exhaust outer pipe 30
A bolt hole 14 into which a bolt 13 penetrating 36 is inserted (see FIG. 2)
) And the bracket on the cylinder block (not shown)
And a bolt hole 15 for connection via the same. The exhaust pipes 5-1 and 5-2 deform the pipe material.
Formed by pressing, but press forming is also possible
It is. 1. The upstream opening of the upper exhaust pipe 5-1 in FIG.
The end 21-1 is better illustrated in FIGS.
As shown, the downstream ends 17 of the pair of exhaust manifolds 4-2, 4-3
-2 and 17-3 are fitted so that they can slide relative to each other (downstream end 17
-2 is not shown). Cross section of these downstream ends 17-2, 17-3
The shape is a quarter-arc shape. Also, in FIG. 1, the lower collecting exhaust pipe 5-2
The upstream open end 21-2 of FIG.
As shown, a pair of exhaust manifold pipes 4-1 and 4-4
The downstream ends 17-1 and 17-4 are fitted so as to be relatively slidable.
(The downstream end 17-1 is not shown). These downstream ends 17-1, 17
The cross-sectional shape of -4 is a quarter arc. The collective exhaust pipes 5-1 and 5-2 are shown in FIGS.
These are assembled into a circle, as better illustrated
Each section of the exhaust manifold 4-1 to 4-4
The entire downstream end 17-1 to 17-4 in a 1/4 arc shape has a substantially circular cross section
Converge and combine them to form an upstream
The trachea 5 is constituted. The exhaust manifold 6 is made of two press-molded sheets.
Between the front half case 6-1 and the rear half case 6-2
And welded over the entire outer circumference of the abutment.
And their branch upstream ends 26-1 to 26-4 are
Closely attached to the outer periphery of the upstream end of the pipes 4-1 to 4-4
And fitted into the communication holes 10-1 to 10-4 of the upstream flange 2.
Although not shown in detail, welding
The communication holes 10-1 to 10-4 of the side flange 2 and the exhaust pipe 4
-1 to 4-4 upstream end and branch upstream end of exhaust manifold 6
26-1 to 26-4 are integrally connected to each other. Each case half 6 on the front and back sides of the exhaust manifold case 6
-1 and 6-2, the downstream ends 27-1 and 27-2 of FIGS.
As shown in the figure, the curved outer circumference of the collective exhaust pipes 5-1 and 5-2
Close to the surface, fitted into the hole 20 of the downstream flange 3,
By welding, the hole 20 of the downstream flange 3 and the collecting exhaust pipe
5-1 and 5-2 curved outer peripheral surfaces and front and back side case halves 6-1;
6-2 and the assembly downstream ends 27-1 and 27-2
Being bound to the body. Downstream end 17-1 of exhaust manifold pipes 4-1 to 4-4
17-4 slide part where it is connected to the collective exhaust pipes 5-1 and 5-2
25-1 to 25-4 are better illustrated in FIGS.
As described above, the upstream opening end 21-1 of the collective exhaust pipes 5-1 and 5-2,
21-2 in pairs (25-2 and 25-3, 25-1 and 25-4)
Fitted, relative along the longitudinal direction of each pipe 4-1 to 4-4
It is slidable. Here, the slurry of the exhaust manifold pipes 4-1 to 4-4 is
The guides 25-1 to 25-4 have their curved surfaces and the collective exhaust pipe 5-
Plane on the side contacting the upstream open ends 21-1, 21-2 of 1, 5-2
And the upstream opening end 21 of the collective exhaust pipes 5-1 and 5-2.
-1 and 21-2 are slidably held. The sliding portion 25 of the exhaust manifold 4-1
-1 and the flat surface facing the sliding part 25-4 of the exhaust manifold 4-4
Between the slide part 25-2 of the exhaust manifold 4-2 and the exhaust
Welding also between the opposing planes of the manifold part 4-3 and the slide part 25-3
Are not slid, so that they can be slid relative to each other.
Is held. After all, the slide of the exhaust manifold 4-1 to 4-4
Each of the door parts 25-1 to 25-4 is held so as to be relatively slidable on three surfaces.
The exhaust pipes 4-1 to 4-4 are independent of each other.
It can be thermally expanded and contracted. The slide of the exhaust manifold 4-1 to 4-4
Ports 25-1 to 25-4 are provided on the curved surfaces of the collective exhaust pipes 5-1 and 5-2.
Each of the formed inwardly protruding portions 28-1 and 28-2,
Inward protrusions formed on the peripheral surfaces of the half bodies 6-1 and 6-2, respectively.
Protruded parts 29-1 and 29-2 hold it from outside.
Have been. The inwardly projecting portion 28-1 of the collective exhaust pipe 5-1 and the front side
Inward protruding part 29-1 of base half 6-1 and inward of collective exhaust pipe 5-2
The protrusion 28-2 and the inward protrusion 29-2 of the rear case half 6-2 are
Formed at the same circumferential position so that they abut each other
Have been. The exhaust manifold pipes 4-1 to 4-4 are upstream and downstream
Between Lange 2 and 3, only at this point
Pressed from the outside by the back half case 6-1 and 6-2
Is held. The downstream open ends 22- of the collective exhaust pipes 5-1 and 5-2
1, 22-2 are lower than the downstream flange 3 in FIG.
In FIG. 4, a downstream exhaust pipe that projects to the left
It has a connection with 31. The downstream open ends 22-1, 22-2 are shown in FIGS.
As shown in FIG. 2 and FIG.
Open end position of each curved surface and each flat surface of the trachea 5-1 and 5-2
The positions of the open ends of the respective plane portions are as shown in FIG.
As shown in the figure, the position of the open end of each curved surface is
And project outwardly with an arc-shaped contour l.
You. The flat surfaces of the collective exhaust pipes 5-1 and 5-2 are
These pipes were assembled into a circle to form the upstream exhaust pipe 5
At this time, the inside of the upstream exhaust pipe 5 is divided into two flow paths.
The partition plates 34-1 and 34-2 are configured (see FIGS. 4 and 6).
Therefore, the downstream ends of the partition plates 34-1 and 34-2 are circular arc-shaped.
The fact that it is formed so as to protrude outward with the outline l drawn
it can. In addition, these partition plates 34-1 and 34-2 (set
The exhaust pipes 5-1 and 5-2 have flat surfaces at their downstream ends.
At a predetermined distance from the contour line l of FIG.
1, see FIG. 2 and FIG. 7).
Bent in the direction of each curved surface of
Forming bent part portions 42-1 and 42-2 of these bent pieces.
The parts 42-1 and 42-2 are composed of a collection of exhaust pipes 5-1 and 5-2
When crossed, a deep glass cup-shaped sky between their backs
A space A (see FIGS. 3, 4, and 6) is formed. In this space A, a seal mesh described later is used.
35 is protruded and filled for a predetermined length. Dividers 34-1, 34-2
Indicates the laminated portions except for the bent piece portions 42-1 and 42-2.
And divides the interior of the upstream exhaust pipe 5 into two flow paths.
Functions as a single partition plate. The downstream exhaust pipe 31 is shown in FIG.
As shown in FIG.
The exhaust gas passage in the downstream exhaust pipe 31 is divided into two exhaust gas passages.
Part S_{twenty one}, S_{twenty two}Is divided into And these exhaust
Gas passage part S_{twenty one}, S_{twenty two}Each of which will be explained in detail later
As shown, the downstream open ends 22-1, the collective exhaust pipes 5-1 and 5-2,
Exhaust gas passage section S connected to 22-2₁₁, S₁₂In each of
Each is connected for communication. Next, the collective exhaust constituting the upstream exhaust pipe 5
Downstream exhaust outside the pipes 5-1 and 5-2 and the downstream exhaust pipe 32
The connection structure between the pipe 30 and the downstream exhaust inner pipe 31 is shown in FIG.
This will be described in detail with reference to FIG. First, downstream
The exhaust pipe 32 is provided between the downstream exhaust pipe 30 and the downstream exhaust pipe 31.
At a plurality of locations in the axial direction between the
A mesh 45 made of teal is interposed, and these two tubes are integrated.
Assembled. At the upstream end of the downstream exhaust pipe 30, a spherical seat 38 is provided.
Attached flange 36 is integrally fixed. This spherical seat
Bolts 13 are inserted into the flange 36 at multiple locations in the circumferential direction.
A hole 37 for letting it pass is formed. The upstream end of the downstream exhaust pipe 31 is flared.
To form a tapered enlarged portion 39. this
The enlarged diameter portion 39 forms a gap between the enlarged diameter portion 39 and the upstream end of the downstream side exhaust outer pipe 30.
Remaining covering the upstream end. This allows downstream exhaust
The outer tube 30 and the downstream exhaust tube 31 can be independently thermally expanded and contracted.
And the vibration of the upstream exhaust pipe 5 and the downstream exhaust pipe 32
Therefore, even if the flow path of the exhaust gas changes, the collective exhaust pipe 5-1,
5-2 Exhaust gas passage S₁₁, S₁₂Exhaust gas flowing inside
The corresponding exhaust gas passage portion of the downstream side exhaust inner pipe 31
S_{twenty one}, S_{twenty two}Exhaust gas is guided between the pipes 30, 31
To control the outflow. The inside of the downstream exhaust pipe 31 is as described above.
And the two exhaust gas passages S_{twenty one}, S_{twenty two}
Is divided into And the upstream end of this partition plate 33
The arc-shaped downstream end of the partition plates 34-1 and 34-2 of the upstream exhaust pipe 5
Draw an arc-shaped contour line n corresponding to the contour line l
Is formed in a recess. Therefore, these contours
l and n draw concentric arcs. Further, the circle of the partition plate 33 of the downstream exhaust inner pipe 31
The arc-shaped upstream end is covered with a cover 43, and a partition plate is provided.
As well as protecting the upstream end of 33,
When the upstream exhaust pipe 5 and the downstream exhaust pipe 32 vibrate,
Slidably in contact with the mesh 35
Minute S₁₁And exhaust gas passage S_{twenty one}Communication with the exhaust gas passage
Part S₁₂And exhaust gas passage S_{twenty two}Maintain communication with
As a result, the exhaust gas flowing in the two communication passages interferes with each other.
Is prevented. The downstream flange 3 and the lower part of the exhaust manifold 1
Flan with spherical seat fixed to the upstream end of the downstream exhaust pipe 30
The annular convex portion 12 of the downstream flange 3 and the spherical surface
The gas is seated on the spherical seat 38 of the seated flange 36.
A ket 40 is interposed. This gasket 40
Spring between the head of G13 and flange 36 with spherical seat
41, the screw part of the bolt 13 is fitted with a spherical seat
Through the hole 37 of the flange 36 and the bolt hole 14 of the downstream flange 3.
And fix it with a nut (not shown).
From the two flanges 3 and 36
I have. This gasket 40 is formed as a hemispherical surface.
Having an outer surface, said outer surface having a spherical seated flange 36;
Of the upstream exhaust pipe 5 and
Making a spherical joint that allows omnidirectional vibration of the downstream exhaust pipe
I have. The gasket 40 has a radial position.
An auxiliary pipe 44 is provided for making the decision. This
The auxiliary pipe 44 is provided between the inner peripheral surface of the hole 20 of the downstream side flange 3 and
It is inserted between the curved outer peripheral surfaces of the collective exhaust pipes 5-1 and 5-2.
And fixed. Downstream flange 3 and flange 36 with spherical seat
With the gasket 40 sandwiched between them,
When the bolts are connected, the partition of the upstream exhaust pipe 5
The downstream ends of the bent pieces 42-1 and 42-2 of the plates 34-1 and 34-2 are on the downstream side.
The exhaust inner pipe 31 is made to protrude inward from the connection side end face.
The space filled in the back space A of the bent pieces 42-1 and 42-2.
The arc-shaped tip surface of the mesh mesh 35 is
On the arc-shaped tip surface of the cover 43 covering the upstream end of the partition plate 33
Contact caused the upstream exhaust pipe 5 and downstream exhaust pipe 32 to vibrate
When sliding smoothly with each other, the bent pieces 42-1 and 42-2
As a buffer for contact sliding between the downstream end and the upstream end of the partition plate 33
Perform the function of The arc-shaped tip surface of the seal mesh 35 and the cover
43 arc-shaped tip faces are the partition plates 34-1 and 34-2 and the partition plate
In the width direction of 33, and also in the direction orthogonal to the width direction,
They are concentric arcs, and both of these arc-shaped end faces
Is the hemispherical surface of the gasket 40 when they slide in contact
Are located on the extended hemisphere respectively.
You. The present embodiment is configured as described above.
Therefore, the following effects can be obtained. Divider
34-1, 34-2, and 33 separate the interior into two channels
The split upstream exhaust pipe 5 and downstream exhaust pipe 32 (downstream exhaust
The outer tube 30 and the downstream exhaust inner tube 31) form a spherical joint.
The exhaust pipe 5 is connected to the
The partition plates 34-1 and 34-2 and the partition plate 33 inside the downstream exhaust pipe 31
Are close to each other and their tip contours are
Concentric arcs, and at their tips
Is a seal mesh 35, each functioning as a cushioning material,
A cover 43 is provided, and these seal mesh 35, cover
43 tip contours are also available for each partition plate 34-1, 34-2, and 33 tip wheels.
Concentric arcs are formed along the contours
The top surfaces of the seal mesh 35 and the cover 43 are mutually
It is adapted to slide in contact. As a result, the partition plate 34 inside the upstream side exhaust pipe 5
-1, 34-2 and downstream with the seal mesh 35 disposed at the tip
Cover located at the end of the partition plate 33 inside the side exhaust inner pipe 31
-43 are the upstream exhaust pipe 5 and the downstream exhaust pipe32Connection with
In the above, two flow paths (S₁₁And S
_{twenty one}Communication channel with S₁₂And S_{twenty two}Communication channel with the
The tips of both partition plates 34-1, 34-2, and 33 maintained contact.
Each flow path of the upstream exhaust pipe 5
S₁₁, S₁₂The exhaust gas flowing through the
Correspondence channel S_{twenty one}, S_{twenty two}Can not enter other than
Channel S_{twenty two}, S_{twenty one}Completely prevent interference with exhaust gas flowing through
be able to. In this way, it is possible to completely prevent exhaust gas interference.
In addition to being able to do, seal mesh 35, cover 43
The contact surfaces of the
And do not straddle the partition 33, 34-1, 34-2 on the other side.
Thus, the thickness dimension can be reduced accordingly. But
Thus, each connection between the upstream exhaust pipe 5 and the downstream exhaust inner pipe 31 is performed.
Passage (S₁₁And S_{twenty one}, S₁₂And S_{twenty two}The amount of overhang inside is small
Less resistance to exhaust gas flow.
Exhaust gas flowing through each communication flow path is
Can flow smoothly. The partition plate 34-1 inside the exhaust pipe 5 on the upstream side,
Tip of 34-2 and tip of partition plate 33 inside downstream exhaust inner pipe 31
Parts are provided with a seal
Contact through the cover 35 and the cover 43.
The tip contour of the partition plates 34-1, 34-2, and 33 and the seal
The tip contours of the shoe 35 and the cover 43 should be aligned with each other.
Because they are concentric arcs, both partition plates 34-1, 34-2,
Rolling of upstream and downstream exhaust pipes 5 and 32 in plane 33
(See the white arrow in FIG. 7), of course, orthogonal to this.
Absorbs pitching and yawing in the plane sufficiently
And the vibration direction of the upstream and downstream exhaust pipes 5 and 32 is regulated.
Never be. Each end of the seal mesh 35 and the cover 43
The contact sliding surface at the end extends the hemisphere of the outer surface of the gasket 40.
Are formed so as to be located on the set hemisphere.
When the upstream and downstream exhaust pipes 5 and 32 vibrate,
The moving surfaces are all on the same spherical surface. As a result,
Eliminates the need to prepare multiple spherical surfaces to obtain a moving surface
As a result, the structure of the sliding portion is simplified, and the manufacture is facilitated.
Vibration in all possible directions while maintaining airtightness
Can be absorbed more fully,
It is further possible that the vibration direction of the downstream exhaust pipes 5 and 32 is restricted.
Less. Rolling of the upstream and downstream exhaust pipes 5, 32
Direction should match the direction of the most frequent displacement of the vehicle
It is preferable to keep
Sufficiently absorbs vibration while maintaining airtightness.
Can be collected. Further, when the upstream and downstream exhaust pipes 5 and 32 vibrate,
Then, the seal mesh 35 and cover that function as a cushioning material
The 43 end faces slide in contact with each other, and both metal partition plates 34-1,
34-2 and 33 do not slide against each other
No abnormal noise is generated, and the sliding is smooth.
You. In addition, this allows the arcs of the two partition plates 34-1, 34-2, 33
Tip is protected from abrasion due to sliding,
Performance can be improved. Further, the upstream and downstream exhaust pipes 5 and 32 and the
Parts 34-1, 34-2, 33 are heated by the exhaust gas
Therefore, even if thermal expansion occurs, this thermal expansion
As it is absorbed by the shrinkage of the cover 35 and the cover 43,
Exhaust pipes 5 and 32 and each partition plate 34-1, 34-2, and 33 have thermal distortion and
This can prevent the occurrence of a lock. The upstream end of the downstream exhaust pipe 31 is
Since the processing is performed, the upstream exhaust pipe 5 and the downstream exhaust pipe 5
Even if the flow path of the exhaust gas fluctuates due to the vibration of the trachea 32,
Exhaust gas passage portion S of the upstream exhaust pipe 5₁₁, S₁₂Flowing inside
Exhaust gas passage of downstream exhaust pipe 31 for exhaust gas
Minute S_{twenty one}, S_{twenty two}Exhaust gas into the downstream exhaust
Spillage between the outer pipe 30 and the downstream exhaust inner pipe 31 is suppressed.
Can be Further, the exhaust manifold in the present embodiment
The node 1 has the following functions and effects.
When an internal combustion engine (not shown) starts operating, the fuel
The high-temperature exhaust gas generated in the firing chamber is
Communication holes 10-1 to 10-4 of the upstream flange 2 from the
Pipe (thin branch pipe) 4-1 to 4-4 and sheet metal assembly
The exhaust gas is discharged to the downstream exhaust pipe 32 via the exhaust pipes 5-1 and 5-2.
You. Here, downstream of the exhaust manifold pipes 4-1 to 4-4
The ends 17-1 to 17-4 are connected to the exhaust pipes 5-1 and 5-2.
Ride sections 25-1 to 25-4 are open upstream of collective exhaust pipes 5-1 and 5-2.
It is fitted in pairs at the mouth ends 21-1 and 21-2, and the length of each pipe is
It is held so as to be relatively slidable along the hand direction. Also,
Slide part 25-1 of exhaust manifold pipe 4-1 and exhaust manifold pipe
4-4 between the planes facing the slide part 25-4 and the exhaust manifold
The slide section 25-2 of the pipe 4-2 and the exhaust pipe 4-3
There is no welding between the opposing planes with the ride part 25-3.
It is slidably held. As a result, under the exhaust manifolds 4-1 to 4-4,
Part where the flow ends 17-1 to 17-4 converge to the collective exhaust pipes 5-1 and 5-2
Stress acting on the mating surface (sliding surface) of the
Each opposed plane of the slide parts 25-1 to 25-4 of the pipes 4-1 to 4-4
Thermal stress acting between them is absorbed, resulting in distortion due to thermal stress.
Occurrence of light and cracks is prevented. In addition,
Thermal stress on the base 6 is also prevented. By these
Of the exhaust manifold 1 against heating by exhaust gas
The durability and reliability are improved. The slides of the exhaust pipes 4-1 to 4-4
Doors 25-1 to 25-4 are formed in the collective exhaust pipes 5-1 and 5-2.
The inner protrusions 28-1 and 28-2 and the front and back sides of the exhaust manifold case 6
Inward projections 29-1, 29-2 formed on the half bodies 6-1 and 6-2
And is held down from the outside by the
Heat of the exhaust pipes 5-1 and 5-2 and the exhaust manifold
The amount of heat transmitted through the base 6 and radiated to the outside as radiant heat is
Decrease. Furthermore, the exhaust manifold pipes 4-1 to 4-4 and the collection
Between the outer circumference of the combined exhaust pipes 5-1 and 5-2 and the exhaust manifold 6
The formed space 7 functions as a heat insulating space. these
As a result, it is possible to obtain an exhaust manifold 1 having excellent heat insulating properties.
Can reduce the ambient temperature in the engine room (engine room)
Can be maintained. The exhaust manifold 1 has excellent heat insulation properties.
In addition to the thin exhaust manifold pipes 4-1 to 4-4 and the plate
The exhaust pipes 5-1 and 5-2 made of gold are suddenly
The exhaust gas is kept at a high temperature
it can. As a result, even immediately after the start of the internal combustion engine, the exhaust gas is discharged.
The gas gas purification catalyst is immediately activated, and the exhaust gas is sufficiently purified.
Will be possible. Furthermore, the slurry of the exhaust manifolds 4-1 to 4-4
The guide parts 25-1 to 25-4 are the upstream open ends of the collective exhaust pipes 5-1 and 5-2.
Parts 21-1, 21-2, each exhaust manifold pipe 4-1 to 4
-4 even if it is relatively slidable along the longitudinal direction.
Of each case half 6 on the front and back sides of the exhaust manifold 6
-1, 6-2 formed with inwardly protruding portions 29-1, 29-2.
The internal combustion engine is not shown because it is pressed and held toward
Even if the vibration generated in is transmitted to the exhaust manifold 1,
The vibration of the fitting portion is reliably suppressed. Further, four cylinders of an internal combustion engine (not shown)
Combustion occurs at equal intervals in the order of cylinders 1, 3, 4, and 2.
And the combustion intervals are long and the exhaust strokes do not overlap.
Exhaust manifold pipes 4-1 and 4 connected to each exhaust port of cylinder # 4
-4, downstream end 17-1, 17-4, combustion interval is far away, heavy exhaust stroke
Exhaust manifold connected to each exhaust port of the 2nd and 3rd cylinders
The downstream ends 17-2 and 17-3 of the pipes 4-2 and 4-3 are
And the upstream opening ends 21-1, 21 of the collective exhaust pipes 5-1 and 5-2.
-2, which may cause exhaust interference.
The dynamic effect of exhaust is fully exhibited, and the suction efficiency is improved.
Increase indirectly and maintain high levels of engine power and efficiency
Can be In addition, radiation noise due to exhaust interference is reduced
can do. The slide of the exhaust pipes 4-1 to 4-4
Dowels 25-1 to 25-4 are the upstream open ends of the collective exhaust pipes 5-1 and 5-2
The airtightness of the part that is slidably fitted to 21-1 and 21-2 is complete.
Even if not fully retained, the exhaust manifold pipes 4-1 to 4-4 and
The exhaust manifolds 5-1 and 5-2 have an exhaust manifold case 6
Air tightly sealed, preventing leakage of exhaust
Can be stopped. Further, each of the exhaust pipes 4-1 to 4-4
The flow ends 17-1 to 17-4 are aligned in parallel, and the exhaust
1, 5-2 paired with the upstream open ends 21-1 and 21-2
And the downstream open ends of the collective exhaust pipes 5-1 and 5-2
Parts 22-1 and 22-2, so that exhaust gas
The flow is rectified, and the air is exhausted smoothly without significant turbulence
It can flow through the manifold 1 and exhaust resistance decreases.
Thus, the efficiency of inhalation can be improved. In addition, the exhaust gas flow
Radiated sound due to the disturbance of the sound can be reduced. Further, each of the exhaust manifold pipes 4-1 to 4-4
For the mutual and collective exhaust pipes 5-1 and 5-2,
Since each can slide freely,
The generation of thermal stress due to thermal expansion and contraction is suppressed, and vibration
The generation of stress due to movement is also prevented, and the exhaust manifold 4-1 to 4
-4 and collective exhaust pipes 5-1 and 5-2 are more durable
You. Further, the exhaust gas of each cylinder is collected.
Exhaust manifolds are not required
1 can be formed compactly,
And the heat radiation area to the outside is reduced,
It is possible to maintain a high heat retaining capacity of the gas.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is provided with a collective exhaust pipe used for an exhaust pipe connecting structure using a spherical joint in one embodiment of the invention described in claims 1 and 2 of the present application. FIG. 2 is a front view of an exhaust manifold of the multi-cylinder internal combustion engine. FIG. 2 is a partially cutaway plan view of a collection portion of a plurality of branch pipes and a downstream flange portion of the exhaust manifold of FIG. 1; FIG. 3 is a side view as viewed from an X direction in FIG. 2; FIG. 4 is a sectional view taken along line IV-IV of FIG. 2; FIG. 5 is a sectional view taken along line VV of FIG. 4; FIG. 6 is a longitudinal sectional view of a connection structure of an exhaust pipe using a spherical joint according to the embodiment. FIG. 7 is a sectional view taken along line VII-VII of FIG. 6; FIG. 8 is a diagram showing a conventional example. FIG. 9 is a sectional view taken along line IX-IX in FIG. 8; [Description of Signs] 1 ... exhaust manifold, 2 ... upstream flange, 3 ... downstream flange, 4-1 to 4-4 ... exhaust manifold (branch pipe), 5-1, 5-2 ... collective exhaust pipe, 6 … Exhaust case,
6-1: Front case half, 6-2: Back case half, 7: Insulated space, 10-1 to 10-4: Communication hole, 11: Bolt hole, 12: Annular projection, 13: Bolt, 14 , 15 ... bolt hole, 17-1 to 17-4 ... exhaust manifold downstream end, 20 ... hole, 21-1, 21-2 ... collective exhaust pipe upstream open end, 22-1, 22-2 ... collective exhaust pipe Downstream open end,
25-1 ～ 25-4… Exhaust pipe slide, 26-1 ～ 26-4…
Exhaust manifold case upstream end, 27-1, 27-2… Exhaust manifold assembly downstream end, 28-1, 28-2… Collecting exhaust pipe inward projection, 29-1, 29-2… Exhaust manifold inward projection Part, 30 ... downstream exhaust outer pipe, 31 ... downstream exhaust inner pipe, 32 ... downstream exhaust pipe,
33… Partition plate, 34-1, 34-2… Partition plate (collective exhaust pipe flat part), 35… Seal mesh, 36… Flange with spherical seat,
37 ... hole, 38 ... spherical seat, 39 ... enlarged diameter part, 40 ... gasket, 41
… Spring, 42-1, 42-2… Bent piece, 43… Cover, 44
... auxiliary pipe 45 ... mesh, A ... space, S _11, S _12,
S _21, S ₂₂ ... exhaust gas passage portion.

Continued on the front page (72) Inventor Masazumi Naito 1-4-1 Chuo, Wako-shi, Saitama Pref. Inside the Honda R & D Co., Ltd. (72) Inventor Shigeru Furudate 1-4-1 Chuo, Wako-shi, Saitama Pref. (56) References JP-A-9-280443 (JP, A) JP-A-9-210272 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F01N 7/10 F01N 7/08 F16B 7/18 F16L 27/02

Claims (1)

(1) A spherical joint in which an upstream exhaust pipe and a downstream exhaust pipe, each of which is divided into two flow paths by a partition plate, are connected via a spherical joint. In the exhaust pipe connection structure utilizing the above, the partition plate inside the upstream exhaust pipe, the tip of the partition plate is protruded into the downstream exhaust pipe from the connection side end surface of the downstream exhaust pipe, The tip contour shape is formed in a convex shape in an arc shape, and the partition plate inside the downstream exhaust pipe has an arc shape such that the tip contour shape follows the tip contour shape of the partition plate inside the upstream exhaust pipe. Concave portions are formed at the tip of the partition plate inside the upstream exhaust pipe and the tip of the partition plate inside the downstream exhaust pipe, respectively. Are formed in an arc shape so as to respectively follow the end contour shapes of the two partition plates. And the tip surfaces of both cushioning members are slidable in contact with each other, and the spherical joint has a hemispherical outer surface.
Each of the cushioning members is formed of a sket , and each of the arc-shaped tip contour shapes of the cushioning members is formed of the cushioning material.
When the tip surfaces of the material slide against each other, the gasket
The outer hemisphere on the outer surface of the
Is to way, the distal end surface of the distal end portion in the upstream exhaust pipe section, wherein
The tip surface of the tip portion inside the downstream side exhaust pipe is
The width direction of the partition plate inside the exhaust pipe on the flow side and orthogonal to it
Direction, the width direction of the partition plate inside the downstream exhaust pipe and
Make a concentric arc shape in a direction orthogonal to this, and
The arc-shaped tip faces, when they slide in contact,
The spherical seat of the joint is located on the extended hemisphere.
An exhaust pipe connection structure using a spherical joint formed as described above .