JPH04159406A - Variable manifold of sheet metal and manufacture thereof - Google Patents

Abstract

PURPOSE:To facilitate manufacturing by constituting two exhaust pipes of a tapered cylindrical sheet metal outer manifold and an approximately plane shape sheet metal inner manifold to partition its inside into two parts, and fitting a plate shape variable device in slits formed in respective manifolds. CONSTITUTION:Four exhaust pipes 1 connected to an exhaust port of an engine are connected to two exhaust pipes 3 through four connecting pipes 2, and two exhaust pipes 3 are connected to a single exhaust pipe 5 through a single connecting pipe 4. Here, the two exhaust pipes 3 are constituted of an approximately cylindrical shape sheet metal outer manifold 7 where the end part in the upstream side in the exhaust gas flowing direction is expanded, an approximately plane shape sheet metal inner manifold 8 to partition its inside into two parts and a variable device 9 to vary the area and position in an exhaust gas inflow part where exhaust gas flows from the four exhaust pipes 1 into the two exhaust pipes 3. In the tapered part of the outer manifold 7, slits ranging from one edge to a prescribed length position are formed in the shaft center direction, and the variable device 9 is inserted into these slits.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application]
Collect the two exhaust pipes into one, and connect the four exhaust pipes to the connection part between the four exhaust pipes and the two exhaust pipes. The present invention relates to a variable manifold equipped with a variable device having a movable partition plate that varies the area and position of the inlet of exhaust gas into an exhaust pipe, and a method for manufacturing the same.

[Prior Art] Conventionally, manifolds have been used as manifolds that can provide good exhaust inertia effects in both low and high engine speed ranges.
The variable type has a movable partition plate at the connection between the four exhaust pipes and the two exhaust pipes to change the area and position of the exhaust gas inflow part from the four exhaust pipes to the two exhaust pipes. A variable manifold equipped with a device has been proposed (see, for example, Japanese Patent Application Laid-Open No. 1-277624).

Conventionally, such a variable device for a variable manifold has been manufactured by casting or precision casting.

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

[Means for Solving the Problems] In order to solve the above problems, the sheet metal variable manifold of the present invention collects four exhaust pipes of a multi-cylinder four-stroke engine with four or more cylinders into two, and The area and position of the inflow part of the exhaust gas from the four exhaust pipes to the two exhaust pipes is determined by combining the exhaust pipes of the In a variable manifold equipped with a variable device having a movable partition plate that varies the amount of air, two exhaust pipes are connected to an outer manifold made of a substantially cylindrical sheet metal whose upstream end is widened into a thickened shape; The outer manifold is configured with an inner manifold made of a substantially flat sheet metal that divides the inside of the outer manifold into two parts to form two exhaust pipes, and the variable device is formed by two plate bodies facing each other with a spacer in between. , a partition plate movably housed between these two plates, and a guide member that guides this partition plate, and this variable device is fitted and fixed into a slit formed in the outer manifold and the inner manifold. This is what I did.

Further, the method for manufacturing a variable manifold made of sheet metal according to the present invention includes 4
The four exhaust pipes of a multi-cylinder four-cycle engine with more than one cylinder are collected into two, and these two exhaust pipes are collected into one, and the connection part between the four exhaust pipes and the two exhaust pipes is created. The variable manifold is equipped with a variable device having a movable partition plate that changes the area and position of the inflow portion of exhaust gas from four exhaust pipes to two exhaust pipes, the variable manifold having two exhaust pipes. The outer manifold is made of a substantially cylindrical sheet metal whose upstream end is widened into a tapered shape, and the interior of this outer manifold is divided into two to form two exhaust pipes. The variable device consists of two plate bodies facing each other via a spacer, a partition plate movably housed between these two plate bodies, and a variable device made of a sheet metal inner manifold. When manufacturing a variable manifold made of sheet metal, in which the variable device is fitted and fixed into slits formed in the outer manifold and the inner manifold, the variable device is inserted into the slit of the inner manifold, and the variable device is inserted into the slit of the inner manifold. The variable device is fixed to each other by welding, and then the variable device is inserted into the slit of the outer manifold while the inner manifold is inserted into the outer manifold, and the outer manifold and variable device are fixed to each other by welding.

[Function] When manufacturing a variable manifold made of sheet metal, 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 closed. The variable device is inserted into the slit, and the outer manifold and the variable device are fixed to each other by welding.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 to 20.

FIG. 1 is a plan view of the main parts of a variable manifold made of sheet metal according to an embodiment of the present invention, FIG. 2 is a partially cutaway front view of the same part, and FIG.
The figure is the same side view, and as shown in Figure 1, four exhaust pipes 1 connected to the exhaust ports (not shown) of the engine are connected to two exhaust pipes 3 via four connecting pipes 2. 2
The main exhaust pipe 3 is connected to one exhaust pipe 5 via one connecting vibe 4. The two exhaust pipes 3 have ends (
An outer manifold 7 made of a substantially cylindrical sheet metal whose end (hereinafter referred to as "one end") is widened in a tapered shape, and an exhaust gas passage 3 that divides the inside of the outer manifold 7 into two parts.
a, 3b, and a variable device 9 that changes the area and position of the exhaust gas inflow portion from the four exhaust pipes 1 to the two exhaust pipes 3. It is configured. These outer manifold 7, inner manifold 8, and variable device 9 are made of materials with 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 v-■ in FIG. 4, FIG. 6 is a sectional view taken along the line Vl-VI in FIG. 4, and FIG. FIG. 8 is a right side view of the same, and FIG. 9 is a left side view of the same. One end side is wider than the cylindrical part. The outer manifold 7 is composed of a pair of divided pieces 11.12, and projecting pieces 11a, llb, 12a, and 12b are integrally provided at both circumferential ends of the divided pieces 11.12. In the cylindrical portion of the outer manifold 7, the protruding pieces 11a, llb and the protruding pieces 12a, 12b face each other at a predetermined interval, and in the thickened portion, the protruding pieces 11a.

The distance between the protruding pieces 11b and the protruding pieces 12a and 12b is wider at one end. 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 fixed to each other. Slits 13 and 14 extending a predetermined length from one end are formed in the thickened portion of the outer manifold 7 along the axial direction.
Furthermore, the slits 14 are located in each of the divided pieces 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 variable device 9 are fixed to each other.

FIG. 10 is an external perspective view of the inner manifold 8, which is composed of a divided piece 16 and a divided piece 17. The divided pieces 16 and 17 have a rectangular flat plate shape on the other end side from the central part in the axial direction, and one end side of this flat plate part is widened in a light spreading shape, and both sides of the central part in the width direction are circular. It is arc-shaped. The flat plate-like parts of the divided pieces 16 and 17 are fixed to each other, and the widened parts are attached to the divided piece 1.
6 and the dividing piece 17 have opposing surfaces that are convex.

A slit 18.19 extending a predetermined length from one end is formed along the axial direction in the widened portion of the divided piece 16.17. Note that the slit 19 does not appear 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 ends in the width direction of the divided pieces 16° 17 are the protruding pieces 11 a and 1 of the divided pieces 11 and 12 of the outer manifold 7.
1b, 12a, and 12b. That is, when considering FIG. 2 as a reference, the inner manifold 8 is arranged such that the flat plate-like portion thereof lies along a horizontal plane.

FIG. 11 is an exploded perspective view of the main parts 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 recesses 21a and 21b, and recesses 22a and 22b. A flat plate 22, a pair of flat spacers 23a and 23b for forming a predetermined gap between the plates 21 and 22, and between the plates 21 and 22. A flat partition plate 24 slidably inserted into the plate body 2
A stopper 25 is fixed at an angle of 1° 22 to restrict movement of the partition plate 24. The partition plate 24 has a main body part 24a and a protrusion part 24b that integrally projects from the main body part 24a and has a distal end located outside the plates 21 and 22. A long hole 26 is formed along the protrusion 24b, and a long hole 27 is formed in the protrusion 24b in a direction perpendicular to the axial direction. The long hole 26 has a plate 21,
A pin 28 serving as a guide member passing through 22 is slidably fitted, and the partition plate 24 is guided by the pin 28 and moves in the axial direction. A projecting piece 29 is integrally provided on the plate 22, and the plate 21, the spacers 23a, 23b, and the plate 22 have a plurality of pieces (eight pieces in this embodiment, but only three pieces are shown in FIG. 11). They are secured together by blind rivets 30 (shown). As shown in FIG. 13, a hollow V-shaped bracket 32 is fixed to the protruding piece 29 of the plate 22, and bent portions 32a and 32b rising at a nearly right angle from the tip of the bracket 32 have recessed portions 33a. , 33
b is formed. A hole 34 is formed in the protruding piece 29 of the plate body 22.
(FIGS. 11 and 12), and a screw hole is provided in the bracket 32 concentrically with the hole 34. A bolt 35 is screwed into this screw hole as shown in Fig. 14.
A lever 36 as shown in FIG. 15 is rotatably inserted between the head of the bolt 35 and the protruding piece 29 of the plate 22. The lever 36 has a hole 37 through which the bolt 35 passes,
A hole 38 into which the pin 39 is fitted and fixed, and three recesses 36a.
, 36b, and 36c are formed, and the pin 39 is slidably fitted into a long hole 27 formed in the protrusion 24b of the partition plate 24. 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, respectively. wire 43
The wires 43 and 44 pass 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 is inserted into the slit 13.14 of the outer manifold 7 and the slit 18.19 of the inner manifold 8, and is fixed to the outer manifold 7 and the inner manifold 8.

In other words, the two exhaust pipes 3 mean that the inside of the outer manifold 7 is divided into two by the inner manifold 8, thereby forming two exhaust gas passages 3a and 3b (Fig. 2). From the outside, it looks like one piece. Further, when the wire 44 is pulled by the driving device, the lever 36 rotates clockwise as shown in FIG. 2, and the partition plate 24 moves to the right end as shown by the solid line. In this state, the recesses 21a of the plates 21 and 22.

21b, 22a, and 22b are open, and the exhaust gas that flows into the exhaust pipe 3 through the upper two connecting vibes 2 of the four connecting vibes 2 immediately merges through the recesses 21a and 22a. , is exhausted through the exhaust gas passage 3a, the connecting vibe 4, and the exhaust pipe 5. Exhaust gas that has flowed into the exhaust pipe 3 through the lower two connecting vibes 2 among the four connecting vibes 2 passes through the recesses 21b and 22b and immediately merges with the exhaust gas passage 3b and the connecting vibe 4. It is exhausted through the exhaust pipe 5. When the wire 43 is pulled by the drive device, the lever 36 rotates counterclockwise, and the partition plate 24 moves to the left end as shown by the imaginary line. In this state, the recesses 21a, 21b, 22a, 22 of the plate 21.22
b is closed by a partition plate 24, and the exhaust pipe 3 passes through the upper two connecting vibes 2 among the four connecting vibes 2.
The exhaust gas that has flowed into is divided by the partition plate 24 and flows downstream as it is, and merges at the tip of the partition plate 24, that is, at a position near the cylindrical part of the outer manifold 7, and is connected to the exhaust gas passage 3a, the connecting vibe 4, and the exhaust gas. It is exhausted through pipe 5. Exhaust gas that has flowed into the exhaust pipe 3 through the lower two connecting pipes 2 among the four connecting pipes 2 is divided by the partition plate 24 and flows directly to the downstream side.
4, that is, at a position near the cylindrical portion of the outer manifold 7, and is exhausted through the exhaust gas passage 3b, the connecting pipe 4, and the exhaust pipe 5.

In this manner, by moving the partition plate 24, the connection positions between the four exhaust pipes 1 and the two exhaust pipes 3 are substantially moved, and the area of the exhaust gas merging section is changed. That is, in the axial direction of the exhaust pipe 3, the cross-sectional area of the exhaust gas passages 3a and 3b is larger at one end than at the center, so by pulling the wire 44, two of the four exhaust pipes 1 can be separated from each other by pulling the wire 44. The area of the merging portions of the four exhaust pipes 1 to the two exhaust pipes 3 becomes larger, increasing the interference of exhaust gas, and by pulling the wire 43, the area of the merging portions of the four exhaust pipes 1 to the two exhaust pipes 3 becomes smaller. Exhaust interference is reduced. Therefore, it is possible to obtain a good exhaust inertia effect both in the low engine speed range and in the high engine speed range.

Next, the procedure for manufacturing the variable manifold made of sheet metal will be explained. When manufacturing the variable device 9, first the partition plate 24
The pin 28 is fitted into the long hole 26 of the plate body 21 and the plate body 22.
The spacers 23a, 23b and the partition plate 24 are inserted between the plate body 21, the spacers 23a, 23b and the plate body 22.
Insert the blind rivet 30 through and swage it. Next, the stopper 25 is inserted between the plate bodies 21 and 22, and the plate bodies 21 and 22 and the stopper 25 are fixed by welding.

In this way, the variable device 9 is almost completed as shown in FIG.

On the other hand, two connecting pipes 2 are attached to a jig 47 as shown in FIG.
are set, one end of the divided piece 16 of the inner manifold 8 is fitted into these connecting 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, and as shown in FIG. The flat plate-shaped portions 16 and 17 are fixed to each other by spot welding 50 at a plurality of locations (five locations in this embodiment). By combining the two flat plate portions of the inner manifold 8 in this manner, the rigidity is increased and vibrations during operation can be reduced. Next, while the variable device 9 is inserted into the slit 18, 19, the inner manifold 8 and the variable device 9 are fixed to each other by welding. Next, as shown in Figure 19, the slit 13
．． 14, cover the divided pieces 11 and 12 of the outer manifold 7 over the inner manifold 8, and remove the protruding pieces 11a, llb, 12a of the divided pieces 11 and 12.
, 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 further 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 they are fixed together by welding. Next, a plurality of hooks 48 are fixed to the outer periphery of the outer manifold 7 by welding, and the plate body 22
A bracket 32 is fixed to the protruding piece 29 by welding, and a lever 36 is attached by screwing a bolt 35 into the bracket 32. Then, the pin 39 is inserted into the elongated hole 27 of the partition plate 24, and further fitted and fixed into the hole 38 of the lever 36. Then connect wires 43 and 44 to pins 41 and 42, and
The assembly work is completed by fitting and fixing 1.42 into the recesses 36a and 36b of the lever 36.

In this way, the variable manifold made of sheet metal has two exhaust pipes 3 connected to an outer manifold 7 made of a substantially cylindrical sheet metal whose upstream end is widened in a tapered shape, and an inner part of the outer manifold 7. is divided into 2' parts and two exhaust pipes 3 are installed.
That is, it is constituted by an inner manifold 8 made of a substantially flat sheet metal forming exhaust gas passages 3g and 3b,
The variable device 9 is connected to two plates 21 and 22 facing each other via spacers 23a and 23b, and these two plates 21゜2.
The variable device 9 is configured by a partition plate 24 movably housed between the partition plate 24 and a pin 28 as a guide member for guiding the partition plate 24. ,14
, 18, 19, it can be easily manufactured by sheet metal work, and the manufacturing cost and weight can be reduced.

In addition, the method for manufacturing the variable manifold made of sheet metal includes the slits 18, 191, and 191 of the inner manifold 8. : Insert the variable device 9, fix the inner manifold 8 and variable device 9 to each other by welding, and then insert the inner manifold 8.
The variable device 9 is inserted into the slits 13 and 14 of the outer manifold 7 while the variable device 9 is inserted into the outer manifold 7, and the outer manifold 7 and the variable device 9 are fixed to each other by welding, so the sheet metal variable manifold described above can be manufactured easily. .

[Another Embodiment] In the above embodiment, the lever 36 is used to move the partition plate 24
Although the present invention is not limited to such a configuration, for example, the partition plate 24 is biased by a spring, a wire is directly connected to the protrusion 24b, and the spring is moved by the wire. The partition plate 24 resists the biasing force.
It may be configured to move.

[Effects of the Invention] As explained above, according to the sheet metal variable manifold of the present invention, two exhaust pipes are arranged in a substantially cylindrical sheet metal outer manifold with the upstream end widened in a tapered shape. and an inner manifold made of a substantially flat sheet metal that divides the inside of this outer manifold into two to form two exhaust pipes. It is composed of a plate body, a partition plate movably housed between the two plate bodies, and a guide member that guides the partition plate, and this variable device is inserted into the 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 it is possible to reduce manufacturing costs and reduce weight.

Further, 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 variable manifold made of sheet metal can be easily manufactured.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the main parts of a variable manifold made of sheet metal according to an embodiment of the present invention, FIG. 2 is a partially cutaway front view of the same part, and FIG.
4 is a plan view of the outer manifold, FIG. 5 is a sectional view taken along the line ■-■ in FIG. 4, FIG. 6 is a sectional view taken along the line Vl-■ in FIG. 4, and FIG. The figure is a partially cutaway front view of the outer manifold, Figure 8 is a right side view of the same,
Fig. 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 the main parts of the variable device, Fig. 12 is an external perspective view of the same, and Fig. 13 is the mounting part of the lever. 14 is an enlarged bottom view of the same, FIG. 15 is an external perspective view of the lever, and FIGS. 16 to 20 are explanatory diagrams of a method of manufacturing a variable manifold made of sheet metal according to an embodiment of the present invention. be. 1.3.5... Exhaust pipe, 7... Outer manifold, 8... Inner manifold, 9... Variable device, 13.14, 18.19... Slit, 21.22
...Plate, 23a, 23b...Spacer, 24...
・Partition plate, 28...Pin (guide member) Patent applicant Kawasaki Heavy Industries Co., Ltd. agent Patent attorney Aohaku Ao (1 other person) Figure 10 Figure 11 Figure 13 Figure 2a Figure 14-Figure 7t5

Claims (1)

[Scope of Claims] Four exhaust pipes of a multi-cylinder four-stroke engine with one or more cylinders are collected into two, and these two exhaust pipes are collected into one, and the four exhaust pipes are combined into one. A variable device with a movable partition plate installed at the connection between the and the two exhaust pipes to change the area and position of the inlet of exhaust gas from the four exhaust pipes to the two exhaust pipes. In the manifold, the two exhaust pipes are divided into an outer manifold made of a substantially cylindrical sheet metal whose upstream end is widened in a tapered shape, and an inner part of the outer manifold divided into two parts. and an inner manifold made of a substantially flat sheet metal forming an exhaust pipe, and the variable device is movable between two plate bodies facing each other via a spacer, and between these two plate bodies. A variable manifold made of sheet metal, comprising the partition plate accommodated therein and a guide member for guiding the partition plate, the variable device being fitted and fixed into slits formed in the outer manifold and the inner manifold. . The four exhaust pipes of a multi-cylinder four-stroke engine with two or more cylinders are collected into two, and these two exhaust pipes are collected into one, and the four exhaust pipes and the two exhaust pipes are combined into one. A variable manifold is provided with a variable device having a movable partition plate for varying the area and position of the inflow portion of exhaust gas from the four exhaust pipes to the two exhaust pipes at the connection portion with the above-mentioned exhaust pipe. The two exhaust pipes are connected to an outer manifold made of a substantially cylindrical sheet metal whose upstream end is widened in a tapered shape, and the inside of this outer manifold is divided into two parts to separate the two exhaust pipes. and an inner manifold made of a substantially flat sheet metal, and the variable device is configured by two plate bodies facing each other with a spacer interposed therebetween, and the variable device movably accommodated between the two plate bodies. When manufacturing a variable manifold made of sheet metal, which is composed of a partition plate and a guide member that guides the partition plate, and in which the variable device is fitted and fixed into slits formed in the outer manifold and the inner manifold, The variable device is inserted into the slit and 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 the inner manifold is inserted into the outer manifold. A method of manufacturing a variable manifold made of sheet metal, characterized in that a variable device and a variable device are fixed to each other by welding.