JPH0646007B2 - Sheet metal variable manifold and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a multi-cylinder 4-cycle engine having four or more cylinders.
The two exhaust pipes are assembled into two, the two exhaust pipes are assembled into one, and the four exhaust pipes are connected to the two exhaust pipes to connect the four exhaust pipes to the two exhaust pipes. The present invention relates to a variable manifold provided with a variable device having a movable partition plate for varying the area and position of an inflow portion of exhaust gas into a book exhaust pipe, and a manufacturing method thereof.

[Prior Art] Conventionally, as a manifold that can obtain a good exhaust inertia effect in both low and high engine speed ranges,
A variable partition plate having a movable partition plate for varying the area and position of the inflow portion of the exhaust gas from the four exhaust pipes to the two exhaust pipes at the connection between the four exhaust pipes and the two exhaust pipes. A variable manifold provided with a device has been proposed (for example, see Japanese Patent Laid-Open No. 1-277624).

Such a variable manifold variable device has been conventionally manufactured by casting or precision casting.

[Problems to be Solved by the Invention] In the conventional variable manifold described above, since the variable device is manufactured by casting or precision casting, the manufacturing cost is high and the weight is heavy.

[Means for Solving the Problems] In order to solve the above problems, the sheet metal variable manifold of the present invention has four exhaust pipes of a multi-cylinder four-cycle engine having four or more cylinders assembled into two exhaust pipes. Area of the exhaust gas inflow part from the four exhaust pipes to the two exhaust pipes and the position at the connecting portion of the four exhaust pipes and the two exhaust pipes. In the variable manifold in which the variable device having the movable partition plate that changes the
The exhaust pipe is an outer manifold made of a substantially cylindrical sheet metal having an upstream end widened in a tapered shape, and the inside of the outer manifold is divided into two to form two exhaust pipes. An inner manifold made of a substantially flat metal plate, and the variable device includes two plate bodies facing each other via a spacer, and a partition plate movably accommodated between the two plate bodies. A guide member for guiding the partition plate is provided, and the variable device is fitted and fixed in slits formed in the outer manifold and the inner manifold.

In addition, the method of manufacturing the sheet metal variable manifold according to the present invention is 4
The four exhaust pipes of a multi-cylinder four-cycle engine of cylinders or more are assembled into two exhaust pipes, and these two exhaust pipes are assembled into one, and a connecting portion between the four exhaust pipes and the two exhaust pipes. A variable manifold in which a variable device having a movable partition plate for varying the area and position of the inflow portion of the exhaust gas from the four exhaust pipes to the two exhaust pipes is installed in the two exhaust pipes. Is an outer manifold made of a substantially cylindrical sheet metal having an upstream end widened in a tapered shape, and the inside of this outer manifold is divided into two to form two exhaust pipes. The variable device is composed of an inner manifold made of sheet metal, and the variable device includes two plate bodies facing each other via a spacer, a partition plate movably accommodated between the two plate bodies, and the partition plate. It is composed of a guide member for guiding, and this variable device is When manufacturing a sheet metal variable manifold fitted and fixed in a slit formed in the manifold and the inner manifold, the variable device is inserted into the slit of the inner manifold, the inner manifold and the variable device are fixed to each other by welding, and then the inner manifold The variable device is inserted into the slit of the outer manifold while the outer manifold is being inserted into the outer manifold, and the outer manifold and the variable device are fixed to each other by welding.

[Operation] When manufacturing the sheet metal variable manifold, the variable device is inserted into the slit of the inner manifold, the inner manifold and the variable device are fixed to each other by welding, and then the inner manifold is inserted into the outer manifold while the outer manifold is inserted into the outer manifold. The variable device is inserted into the slit, and the outer manifold and the variable device are fixed to each other by welding.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 20.

FIG. 1 is a plan view of an essential part of a sheet metal variable manifold according to an embodiment of the present invention, FIG. 2 is a cutaway front view of the same part, and FIG.
The figure is the same side view. As shown in FIG. 1, the four exhaust pipes 1 connected to the exhaust port (not shown) of the engine are connected to the two exhaust pipes 3 through the four connection pipes 2. Has been done, 2
The exhaust pipe 3 is connected to one exhaust pipe 5 via one connection pipe 4. The two exhaust pipes 3 are made of a substantially cylindrical metal plate with an upstream end (hereinafter referred to as “one end”) in the exhaust gas flow direction (hereinafter referred to as “axial center direction”) expanding in a tapered shape. The outer manifold 7 and the inside of the outer manifold 7 are divided into two to form two exhaust gas passages 3
an inner manifold 8 made of a substantially flat metal plate for forming a and 3b, and a variable device 9 for varying the area and position of the inflow portion of the exhaust gas from the four exhaust pipes 1 to the two exhaust pipes 3. It is configured. The outer manifold 7, the inner manifold 8, and the variable device 9 are made of a material having excellent heat resistance such as titanium, steel plate, and stainless steel.

4 is a plan view of the outer manifold 7, FIG. 5 is a sectional view taken along the line VV in FIG. 4, FIG. 6 is a sectional view taken along the line VI-VI in FIG. 4, and FIG.
FIG. 8 is a partially cutaway front view of the same, FIG. 8 is a right side view of the same, and FIG. 9 is a left side view of the same. The outer manifold 7 has a shape in which the other end side is substantially cylindrical rather than the substantially central portion in the axial direction. One end side is expanded in a tapered shape from the shape-shaped portion. The outer manifold 7 is composed of a pair of divided pieces 11 and 12, and the protruding pieces 1 are provided at both ends in the circumferential direction of the divided pieces 11 and 12.
1a, 11b, 12a and 12b are integrally projected. In the cylindrical portion of the outer manifold 7, the projecting pieces 11a, 11b and the projecting pieces 12a, 12b face each other with a predetermined gap therebetween, and in the tapered portion, the projecting pieces 11a, 11b and the projecting pieces 12a, 12b. The distance between and becomes wider on one end side. An inner manifold 8, which will be described in detail later, is inserted between the divided pieces 11 and 12, and the outer manifold 7 and the inner manifold 8 are inserted.
And are fixed to each other. The thickened portion of the outer manifold 7 has slits 13 extending from one end to a predetermined length,
14 is formed along the axial direction, and the slit 13
Is located on the divided piece 11, and the slit 14 is located on the divided piece 12. A variable device 9, which will be described in detail later, is inserted into these slits 13 and 14, and the outer manifold 7 and the variable device 9 are fixed to each other.

FIG. 10 is a perspective view of the outer appearance of the inner manifold 8. The inner manifold 8 is composed of divided pieces 16 and 17. The split pieces 16 and 17 have a rectangular flat plate shape on the other end side with respect to the substantially central portion in the axial direction, and one end side of the flat plate-like portion widens in a divergent shape and both sides of the widthwise central portion are arcuate. Has become. The flat plate-shaped portions of the divided pieces 16 and 17 are fixed to each other, and the widened portion is the divided piece 1.
The opposing surface of 6 and the divided piece 17 is a convex surface. Slits 18 and 19 extending from one end to a predetermined length are formed in the widened portions of the divided pieces 16 and 17 along the axial direction. The slit 19 is not shown in the drawing. The variable device 9 is inserted into the slits 18 and 19, and the inner manifold 8 and the variable device 9 are fixed to each other. Further, both widthwise end portions of the divided pieces 16 and 17 are protruded pieces 11 a, 11 b and 12 of the divided pieces 11 and 12 of the outer manifold 7.
It is fixed to a and 12b. That is, when considering FIG. 2 as a reference, the inner manifold 8 is arranged such that the flat plate-like portion is along the horizontal plane.

FIG. 11 is an exploded perspective view of a main part of the variable device 9, and FIG. 12 is an external perspective view of the same. The variable device 9 has a flat plate body 21 having concave portions 21a and 21b and concave portions 22a and 22b. Between the plate body 22 and a pair of flat plate-like spacers 23 a and 23 b for forming a predetermined gap between the plate bodies 21 and 22. A plate-shaped partition plate 24 slidably sandwiched between the plate body 21,
It is constituted by a stopper 25 fixed to 22 and for restricting the movement of the partition plate 24. The partition plate 24 is the main body 2
4a and a projecting portion 24b that integrally projects from the body portion 24a and has a tip portion located outside the plates 21 and 22. The body portion 24a is formed with an elongated hole 26 along the axial direction. A long hole 27 is formed in the protruding portion 24b along the direction orthogonal to the axial direction. The long holes 26 have plates 21 and 22.
A pin 28 as a guide member penetrating through the is fitted slidably, and the partition plate 24 is guided by the pin 28 and moves in the axial direction. A projecting piece 29 is integrally projectingly provided on the plate body 22, and the plate body 21, the spacers 23a and 23b, and the plate body 22 are plural (eight in this embodiment, but only three in FIG. 11). They are secured to each other by blind rivets 30 (shown). As shown in FIG. 13, a substantially V-shaped bracket 32 is fixed to the projecting piece 29 of the plate body 22, and the bent portions 32 a and 32 b rising substantially at right angles from the tip of the bracket 32 have concave portions 33 a, 33b is formed. A hole 34 (FIGS. 11 and 12) is formed in the protruding piece 29 of the plate body 22, and the bracket 32
A screw hole is concentrically formed with the hole 34. A bolt 35 is screwed into this screw hole as shown in FIG. 14, and a fifteenth portion is provided between the head of the bolt 35 and the projecting piece 29 of the plate 22.
A lever 36 as shown is rotatably sandwiched.
The lever 36 has a hole 37 through which the bolt 35 penetrates, a hole 38 into which a pin 39 is fitted and fixed, and three recesses 36a, 3
6b and 36c are formed, and the pin 39 is the partition plate 2
4 is slidably fitted in the long hole 27 formed in the protruding piece 24b. As shown in FIG. 2, pins 41 and 42 are fitted and fixed in the recesses 36a and 36b, and one ends of wires 43 and 44 are connected to the pins 41 and 42. Wire 43,4
4 passes through the recesses 33b and 33a of the bracket 32, and the other ends of the wires 43 and 44 are connected to a drive device (not shown). The variable device 9 includes the slits 13 and 14 of the outer manifold 7 and the slit 1 of the inner manifold 8.
8 and 19, and is fixed to the outer manifold 7 and the inner manifold 8.

That is, the two exhaust pipes 3 are the exhaust gas passages 3a, 3b (second exhaust pipe) formed by dividing the inside of the outer manifold 7 into two by the inner manifold 8.
The figure) is composed of two, and it looks like one in appearance. When the wire 44 is pulled by the driving device, the lever 36 rotates in the clockwise direction as shown in FIG. 2, and the partition plate 24 moves to the right end as indicated by the solid line. In this state, the concave portions 21a, 21 of the plates 21, 22 are
b, 22a, 22b are opened, and the exhaust pipe 3 passes through the upper two connection pipes 2 out of the four connection pipes 2.
The exhaust gas that has flowed into the exhaust gas is immediately merged through the recesses 21a and 22a, and is exhausted through the exhaust gas passage 3a, the connection pipe 4, and the exhaust pipe 5. The exhaust gas flowing into the exhaust pipe 3 through the lower two connecting pipes 2 out of the four connecting pipes 2 immediately joins through the recesses 21b and 22b,
The exhaust gas is exhausted through the exhaust gas passage 3b, the connection pipe 4, and the exhaust pipe 5. When the wire 43 is pulled by the driving device, the lever 36 rotates counterclockwise, and the partition plate 2
4 moves to the left end like a virtual line. In this state, the recesses 21a, 21b, 22a, 22b of the plates 21, 22 are closed by the partition plate 24, and the four connection pipes 2
The exhaust gas that has flowed into the exhaust pipe 3 through the upper two connecting pipes 2 is partitioned by the partition plate 24 and flows to the downstream side as it is, near the tip of the partition plate 24, that is, the tubular portion of the outer manifold 7. Are joined at the position of, and exhausted through the exhaust gas passage 3a, the connection pipe 4, and the exhaust pipe 5. The exhaust gas that has flowed into the exhaust pipe 3 through the two lower connection pipes 2 out of the four connection pipes 2 is separated by the partition plate 24.
Is divided by the flow path, flows downstream as it is, merges at the tip of the partition plate 24, that is, at a position near the cylindrical portion of the outer manifold 7, and is exhausted through the exhaust gas passage 3b, the connection pipe 4, and the exhaust pipe 5.

In this way, by moving the partition plate 24, the connection positions of the four exhaust pipes 1 and the two exhaust pipes 3 are substantially moved, and the area of the merging portion of the exhaust gas is changed. That is, since the cross-sectional area of the exhaust gas passages 3a and 3b is larger on one end side than the substantially central portion of the exhaust pipe 3 in the axial direction, the two exhaust pipes 1 to 2 exhaust pipes are pulled by pulling the wire 44. The area of the merging portion to the pipes 3 becomes large and the interference of the exhaust gas becomes large. By pulling the wire 43, the area of the merging portions from the four exhaust pipes 1 to the two exhaust pipes 3 becomes small and the exhaust gas becomes Interference is reduced. Therefore, it becomes possible to obtain a good exhaust inertia effect in both the low speed region and the high speed region of the engine.

Next, the procedure of the method for manufacturing the above-mentioned sheet metal variable manifold will be described. When manufacturing the variable device 9, first, the partition plate 24
The pins 28 are fitted into the long holes 26 of the plate body 21 and the plate body 22.
The spacers 23a and 23b and the partition plate 24 are sandwiched between the plate body 21, the spacers 23a and 23b, and the plate body 22.
Insert the blind rivet 30 and crimp. Next, the stopper 25 is inserted between the plate body 21 and the plate body 22, and the plate bodies 21 and 22 and the stopper 25 are fixed by welding.
Thus, the variable device 9 is almost completed as shown in FIG.

On the other hand, the jig 47 as shown in FIG.
Is set, one ends of the divided pieces 16 of the inner manifold 8 are fitted to these connection pipes 2, and both are fixed by welding. Similarly, the two connecting pipes 2 are fixed to the divided piece 17.

Next, as shown in FIG. 17, the divided pieces 16 and 17 are overlapped with each other, and the variable device 9 is inserted into the slits 18 and 19 of the divided pieces 16 and 17 as a jig as shown in FIG. The plate-shaped portions 16 and 17 are fixed to each other by spot welding 50 at a plurality of points (five points in this embodiment). By thus combining the two flat plate-shaped portions of the inner manifold 8, the rigidity is increased and vibration during operation can be reduced. Next, the inner manifold 8 and the variable device 9 are fixed to each other by welding while the variable device 9 is inserted in the slits 18 and 19. Next, as shown in FIG. 19, slit 1
While inserting the variable device 9 in 3, 14, the inner manifold 8 is covered with the divided pieces 11, 12 of the outer manifold 7, and the protruding pieces 11a, 11b, 12 of the divided pieces 11, 12 are covered.
The a and 12b and both widthwise ends of the inner manifold 8 are fixed to each other by welding. Next, the outer manifold 7 and the connecting pipe 2 are fixed to each other by welding, and the outer manifold 7 and the variable device 9 are fixed to each other by welding. Next, as shown in FIG. 20, the connecting pipe 4 is fitted to the other end of the outer manifold 7 and fixed to each other by welding. Next, a plurality of hooks 48 are fixed to the outer periphery of the outer manifold 7 by welding, and the plate 2
The bracket 32 is fixed to the second protruding piece 29 by welding,
A bolt 36 is screwed onto the bracket 32 and a lever 36 is attached. Then, the pin 39 is inserted into the long hole 27 of the partition plate 24, and further fitted and fixed to the hole 38 of the lever 36. Then, the wires 43, 44 are connected to the pins 41, 42, and the pins 41, 42 are fitted and fixed in the recesses 36a, 36b of the lever 36, whereby the assembling work is completed.

As described above, the sheet metal variable manifold includes an outer manifold 7 made of a sheet metal and having a substantially cylindrical shape in which the two exhaust pipes 3 are opened at the upstream end in a tapered shape, and the inside of the outer manifold 7. Is divided into two and two exhaust pipes 3, that is, an inner manifold 8 made of a substantially flat metal plate for forming exhaust gas passages 3a and 3b are formed, and a variable device 9 is provided via spacers 23a and 23b. Two plate bodies 21 and 22 facing each other and these two plate bodies 21 and 22
A partition plate 24 movably accommodated between the partition plate 2 and the partition plate 2
The variable device 9 is composed of a pin 28 serving as a guide member for guiding the slit 4, and the slits 13 and 1 formed in the outer manifold 7 and the inner manifold 8 constitute the variable device 9.
Since it is fitted in and fixed to Nos. 4, 18 and 19, it can be easily manufactured by sheet metal work, and the manufacturing cost can be reduced and the weight can be reduced.

In the method of manufacturing the sheet metal variable manifold, the variable device 9 is inserted into the slits 18 and 19 of the inner manifold 8 to fix the inner manifold 8 and the variable device 9 to each other by welding, and then the inner manifold 8 is fixed to the outer manifold. Since the variable device 9 is inserted into the slits 13 and 14 of the outer manifold 7 while being inserted in the outer manifold 7 and the outer manifold 7 and the variable device 9 are fixed to each other by welding, the above-mentioned sheet metal variable manifold can be easily manufactured.

[Another embodiment] In the above embodiment, the partition plate 24 is formed by using the lever 36.
However, the present invention is not limited to such a configuration. For example, the partition plate 24 is biased by a spring, the wire is directly connected to the protrusion 24b, and the wire is Partition plate 24 against urging force
May be moved.

[Effects of the Invention] As described above, according to the sheet metal variable manifold of the present invention, the outer manifold made of a sheet metal having a substantially tubular shape in which the two exhaust pipes are opened at their upstream end portions in a tapered shape. And an inner manifold made of a substantially flat sheet metal that divides the inside of the outer manifold into two and forms two exhaust pipes. A plate body, a partition plate movably accommodated between the two plate bodies, and a guide member that guides the partition plate. The variable device is provided with slits formed in the outer manifold and the inner manifold. Since it is fitted and fixed, it can be easily manufactured by sheet metal work, and the manufacturing cost can be reduced and the weight can be reduced.

According to the method of manufacturing a sheet metal variable manifold of the present invention, the variable device is inserted into the slit of the inner manifold, the inner manifold and the variable device are fixed to each other by welding, and then the inner manifold is inserted into the outer manifold. Since the variable device is inserted into the slit of the outer manifold and the outer manifold and the variable device are fixed to each other by welding, the sheet metal variable manifold can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a plan view of an essential part of a sheet metal variable manifold according to an embodiment of the present invention, FIG. 2 is a cutaway front view of the same part, and FIG.
The figure is the same side view, FIG. 4 is a plan view of the outer manifold, FIG. 5 is a sectional view taken along the line VV in FIG. 4, and FIG. 6 is a sectional view taken along the line VI-VI in FIG. Figure is a partially cutaway front view of the outer manifold, and Figure 8 is a right side view of the same.
9 is a left side view of the same, FIG. 10 is an external perspective view of the inner manifold, FIG. 11 is an exploded perspective view of a main part of the variable device, FIG. 12 is an external perspective view of the same, and FIG. 13 is a lever mounting portion. FIG. 14 is an enlarged front view of FIG. 14, FIG. 14 is an enlarged bottom view of the same, FIG. 15 is an external perspective view of a lever, and FIGS. 16 to 20 are explanatory views of a method of manufacturing a sheet metal variable manifold according to an embodiment of the present invention. is there. 1, 3, 5 ... Exhaust pipe, 7 ... Outer manifold,
8: inner manifold, 9: variable device, 13,
14, 18, 19 ... Slits, 21, 22 ... Plates,
23a, 23b ... Spacer, 24 ... Partition plate, 28 ...
... Pin (guide member)

Claims (2)

[Claims] 1. An exhaust pipe of a multi-cylinder 4-cycle engine having four or more cylinders is assembled into two exhaust pipes.
Moving to collect into a book and to change the area and position of the inflow part of the exhaust gas from the four exhaust pipes to the two exhaust pipes at the connection part between the four exhaust pipes and the two exhaust pipes In a variable manifold in which a variable device having a partition plate that can be installed is installed, an outer manifold made of a sheet metal having a substantially cylindrical shape in which the upstream ends of the two exhaust pipes are expanded in a tapered shape, and the outer manifold The inside of the room is divided into two
It is configured by an inner manifold made of a substantially flat sheet metal that forms two exhaust pipes, and the variable device can be moved between two plate bodies facing each other via a spacer and between the two plate bodies. A sheet metal variable, characterized in that it is configured by the partition plate housed in the housing and a guide member that guides the partition plate, and that this variable device is fitted and fixed in the slits formed in the outer manifold and the inner manifold. Manifold. 2. The four exhaust pipes of a multi-cylinder four-cycle engine having four or more cylinders are combined into two, and the two exhaust pipes are combined into one.
Moving to collect into a book and to change the area and position of the inflow part of the exhaust gas from the four exhaust pipes to the two exhaust pipes at the connection part between the four exhaust pipes and the two exhaust pipes A variable manifold in which a variable device having a partition plate that can be installed is installed, and an outer manifold made of a substantially cylindrical sheet metal in which the upstream ends of the two exhaust pipes are expanded in a tapered shape. The inside of the outer manifold is divided into two, and
It is configured by an inner manifold made of a substantially flat sheet metal that forms two exhaust pipes, and the variable device can be moved between two plate bodies facing each other via a spacer and between the two plate bodies. When manufacturing a sheet metal variable manifold in which this variable device is fitted and fixed in the slits formed in the outer manifold and the inner manifold, the variable manifold is configured by the partition plate housed in the , The variable device is inserted into the slit of the inner manifold, the inner manifold and the variable device are fixed to each other by welding, and then the variable device is inserted into the slit of the outer manifold while inserting the inner manifold into the outer manifold. And fix the outer manifold and the variable device to each other by welding. Method for producing a sheet metal variable manifolds, characterized in that.