JP3622835B2 - Exhaust pipe device for vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle exhaust pipe device having a merging portion for joining a plurality of exhaust pipes respectively connected to a plurality of exhaust manifolds of a vehicle engine.
[0002]
[Prior art]
A technique is known in which an exhaust pipe of each cylinder is appropriately joined in a vehicle-mounted internal combustion engine to facilitate the layout of the exhaust pipe and to join at a narrow crossing angle so as not to reduce the exhaust efficiency.
[0003]
However, from the vehicle layout, the exhaust pipe is often laid out so as to avoid each unit in the last stage of the overall layout, and the exhaust pipe is forced to be laid out to increase or decrease the crossing angle. There are problems such as.
[0004]
In the case of the V-type engine, since the left and right banks are separated on both sides of the vehicle center, for example, as shown in FIG. 4, the left exhaust pipe 6 and the flange 15 connected to the left and right exhaust manifolds (not shown) with the flange 11. When merging with the connected right exhaust pipe 3, the crossing angle α of the exhaust pipe of the merging portion 21 connected to the muffler M tends to increase from the positional relationship with other units, and it is compact with a narrow crossing angle. There is a problem that layout is difficult. Here, symbol M represents a muffler, and F represents a vehicle frame.
[0005]
[Problems to be solved by the invention]
The present invention has been proposed in view of the above-described problems of the prior art, and particularly in a large vehicle having a V-type engine, the exhaust pipe crossing angle at the junction can be narrowed and the exhaust layout of the vehicle can be made compact. It aims to provide a tube device.
[0006]
[Means for Solving the Problems]
According to the present invention, in an exhaust pipe device for a vehicle having a merging portion that joins first and second exhaust pipes respectively connected to exhaust manifolds of left and right banks of a V-type engine for a vehicle, a semicircular shape is formed. One end of the formed first exhaust pipe (2) and one end of the second exhaust pipe (3) formed in an S shape are arranged adjacent to each other in the vertical direction so that the crossing angle (α) is within 50 °. The exhaust pipe (6) is connected to the collecting pipe (1) by welding and connected to the exhaust manifold of the left bank at the enlarged other end (2a) of the first exhaust pipe (2). One end of the exhaust pipe (6) is welded, and the other end of the exhaust pipe (6) is attached with a flange (11) connected to the exhaust manifold of the left bank, and the other end (3a) of the second exhaust pipe (3) is enlarged. One end of the exhaust pipe (4) connected to the exhaust manifold of the right bank is welded The other end of the exhaust pipe (4) is formed with an enlarged connecting portion (5), and the connecting portion (5) is provided with a slit (5a) to be connected to the exhaust manifold of the right bank. The pipe is inserted and fastened with a band, and the flange (10) is welded to the collecting pipe (1) and the flange of the exhaust pipe attached to the muffler is connected.
[0007]
In carrying out the present invention, it is preferable that the crossing angle of the two exhaust pipes is set to an angle at which an exhaust effect of exhaust flowing through the crossing exhaust pipes is generated and no exhaust interference occurs.
[0008]
Alternatively, in the present invention, it is preferable that a plane including the central axis of the exhaust pipe adjacently disposed above and below is within a range of 30 ° to the left and right with respect to the vertical plane.
[0009]
According to the present invention having such a configuration, the plurality of exhaust pipes in the merging section are arranged adjacent to each other in the vertical direction (more specifically, the plane including the central axis of the exhaust pipe arranged adjacent to the top and bottom is perpendicular to the vertical plane. Therefore, the exhaust pipe does not interfere with other members. In particular, in the case of a large vehicle, since the vehicle height of the vehicle is high, a sufficient margin can be given to the layout by piping up and down.
[0010]
Further, since the exhaust pipes merge with each other at a crossing angle less than a certain angle (more specifically, less than 50 °), the flow resistance is reduced, and the lengths of the exhaust pipes are further adjusted to adjust the left and right banks. By avoiding exhaust interference, the back pressure can be further reduced by the ejection effect, and the flow path resistance can be reduced.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
In the figure, members having the same functions as those of the prior art are denoted by the same reference numerals, and redundant description is omitted.
[0012]
FIG. 1 shows a plan view of a joining portion of exhaust pipes connected to exhaust manifolds of left and right banks of a V-type engine (not shown) mounted on a large truck, with the engine in the upper part and showing the front of the vehicle. Yes.
[0013]
One end of the first exhaust pipe 2 made of a molten aluminum plated steel pipe and formed in a semicircular shape and one end of the second exhaust pipe formed in an S shape are formed in the collecting pipe 1 as shown in FIG. Referring to Fig. A, the cross section α is connected to the collecting pipe 1 by welding so that the crossing angle α is within 50 ° (for example, 40 °).
[0014]
One end of the exhaust pipe 6 connected to the exhaust manifold of the left bank is inserted and welded to the enlarged other end 2a of the first exhaust pipe 2, and the other end of the exhaust pipe 6 is connected to the manifold. A flange 11 is attached.
[0015]
One end of an exhaust pipe 4 connected to an exhaust manifold (not shown) is inserted and welded to the enlarged other end 3a of the second exhaust pipe 3, and the other end of the exhaust pipe 4 is enlarged. The connecting portion 5 is formed, and the connecting portion 5 is provided with a slit 5a divided into four equal parts, and an exhaust pipe connected to an exhaust manifold (not shown) is inserted and fastened with a band. It is configured to prevent cracking.
[0016]
With reference to FIG. 3 showing the arrow B in FIG. 2, a flange 10 is welded to the collecting pipe 1, and a flange of an exhaust pipe attached to a muffler (not shown) is connected.
[0017]
Hereinafter, the function and effect will be described.
The exhaust pipe 6 connected to the left and right banks of the V-type engine joins the first exhaust pipe 2 and the exhaust pipe 4 joins the collecting pipe 1 via the second exhaust pipe 3, respectively. The second exhaust pipe is arranged vertically and has an intersection angle α of 40 °.
[0018]
Further, the first and second exhaust pipes 2 and 3 that join together in the collecting pipe 1 are formed so as to clear other units and are compactly arranged. In the case of a large vehicle, for example, the pipes are arranged vertically below the frame. There is no problem because there is enough room because the vehicle height is high.
[0019]
And since the exhaust gas merges at a sufficiently small crossing angle, the flow resistance is reduced, and the lengths of the exhaust pipes 6 and 4 are adjusted to avoid exhaust interference between the left and right banks, and further by the ejection effect. The exhaust pressure can be reduced.
[0020]
【The invention's effect】
The present invention is configured as described above, and can exhibit the following excellent effects.
(1) The arrangement of the exhaust pipes in the collecting section is up and down, and a layout that avoids the vehicle units arranged in a plane is prepared.
(2) The merging portion can be configured so as to achieve a merging with a small intersection angle with good exhaust efficiency.
(3) A reasonable vehicle layout can be made without difficulty.
[Brief description of the drawings]
FIG. 1 is a plan view of a vehicle exhaust pipe device showing an embodiment of the present invention.
FIG. 2 is a view taken in the direction of arrow A in FIG.
FIG. 3 is a view taken in the direction of arrow B in FIG.
FIG. 4 is a plan view showing an example of a conventional technique.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Collecting pipe 2 ... 1st exhaust pipe 3 ... 2nd exhaust pipe 4, 6 ... Exhaust pipe 5 ... Connection part 5a ... Slit 10, 11 ... Flange

Claims (1)

A first exhaust formed in a semicircular shape in an exhaust pipe device for a vehicle having a merging portion that joins first and second exhaust pipes respectively connected to exhaust manifolds of left and right banks of a V-type engine for a vehicle. One end of the pipe (2) and one end of the second exhaust pipe (3) formed in an S shape are arranged adjacent to each other in the vertical direction so that the crossing angle (α) is within 50 ° ( 1), and one end of the exhaust pipe (6) connected to the exhaust manifold of the left bank is welded to the enlarged other end (2a) of the first exhaust pipe (2), A flange (11) connected to the exhaust manifold of the left bank is attached to the other end of the exhaust pipe (6), and an enlarged other end (3a) of the second exhaust pipe (3) is an exhaust manifold of the right bank. One end of the exhaust pipe (4) connected to the The other end of (4) is formed with an enlarged connecting part (5), and the connecting part (5) is provided with a slit (5a) and an exhaust pipe connected to the exhaust manifold of the right bank is inserted. An exhaust pipe device for a vehicle characterized in that a flange (10) is welded to the collecting pipe (1) and a flange of an exhaust pipe attached to a muffler is connected to the collecting pipe (1).

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