JP5604332B2 - Engine exhaust manifold - Google Patents

Description

  The present invention relates to an exhaust manifold of an engine, and more specifically, an engine that can suppress accumulation of dust and the like on a rib and satisfy a crack suppression function at a branch point even when used in an industrial engine. Related to the exhaust manifold.

Conventionally, as an exhaust manifold of an engine, a pair of branched exhaust introduction pipes, a merged exhaust outlet pipe led out from a branch point of the pair of exhaust introduction pipes, and a mounting flange provided at each branch end of the pair of exhaust introduction pipes And a rib is installed at a branch point of the pair of exhaust introduction pipes (see, for example, Patent Document 1).
According to this type of exhaust manifold, the ribs that are stressed by the difference in thermal expansion coefficient between the cylinder head and the exhaust manifold are reinforced with ribs, and the heat at the branch points is radiated by the ribs, and cracks occur at the branch points. There is an advantage that can be suppressed.
However, in this prior art, the ribs are plate-shaped in the direction orthogonal to the mounting flanges, and there is a problem because they are installed in series between the pair of exhaust introduction pipes and the mounting flanges. .

Japanese Utility Model Publication No. 60-137112 (see FIGS. 1 to 3)

<< Problem 1 >> Dust and the like are easily collected on the rib.
The ribs are plate-like in the direction perpendicular to the mounting flanges, and are installed in series between the pair of exhaust introduction pipes and between the mounting flanges. When the vertical engine is used, the ribs are horizontal and a large gap is not formed between the ribs and the cylinder head, so that dust on the ribs does not fall and dust etc. accumulates on the ribs. easy.

<Problem 2> When used in an industrial engine, the crack suppression function at the branch point is not sufficient.
Since no large gap is formed between the rib and the cylinder head, heat dissipation from the rib is hindered, and when the exhaust manifold is used in an industrial engine that requires high-load continuous operation, it has a crack suppression function at the branch point. I can't be satisfied.

  An object of the present invention is to provide an engine exhaust manifold that can suppress accumulation of dust and the like on a rib and can satisfy a crack suppression function at a branch point even when used in an industrial engine. It is in.

Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIG. 1 (A), a pair of exhaust introduction pipes (2) and (3) branched and a combined exhaust outlet pipe derived from a branch point (5) of the pair of exhaust introduction pipes (2) and (3) (6) and a mounting flange (2a) (3a) provided at each branch end of the pair of exhaust introduction pipes (2) and (3),
As illustrated in FIG. 1B, in an exhaust manifold of an engine in which a rib (7) is installed at a branching point (5) of the pair of exhaust introduction pipes (2) and (3),
As illustrated in FIG. 1 (B), the rib (7) has a plate shape oriented along the mounting flanges (2a) and (3a) and is separated from the mounting flanges (2a) and (3a), and the exhaust of the pair. Installed between the introduction pipes (2) and (3)
2 (A) (B) and 4 (A) (B), the combined exhaust outlet pipe (6) is led out from the branch point (5) in a direction along the mounting flange (2a) (3a). Then, the merged exhaust outlet (6c) is opened at the outlet end of the merged exhaust outlet pipe (6), the outer peripheral surface of the merged exhaust outlet pipe (6) has a quadrangular prism peripheral surface shape, and one surface of the outer peripheral surface is attached to a flange ( 2a) (3a) side outlet pipe flange side peripheral surface (6b), this outlet pipe flange side peripheral surface (6b) is oriented along the mounting flange (2a) (3a), this outlet pipe flange side peripheral surface ( A rib (7) is led out from the outlet pipe flange side peripheral wall portion (6a) provided with 6b) in the direction opposite to the side where the combined exhaust outlet (6c) is located, and this rib (7) is connected to the outlet pipe flange side peripheral surface ( An exhaust manifold for an engine, characterized in that it is formed flush with 6b) and each end of the rib (7) is connected to a pair of exhaust introduction pipes (2) and (3).

(Invention of Claim 1)
The invention according to claim 1 has the following effects.
<Effect 1> It is possible to suppress dust and the like from accumulating on the rib.
As illustrated in FIG. 1 (B), the rib (7) has a plate shape oriented along the mounting flanges (2a) and (3a) and is separated from the mounting flanges (2a) and (3a), and the exhaust of the pair. Since it is installed between the introduction pipes (2) and (3), for example, when the exhaust manifold (8) is used in a vertical engine with a cylinder upright, the rib (7) becomes vertical and the rib (7 ) And the cylinder head (9), a large gap (10) can be formed, and it is difficult for dust or the like to be placed on the rib (7). Further, it is possible to suppress the dust from being dropped from the large gap (10) between the rib (7) and the cylinder head (9) and accumulating dust or the like on the rib (7).

<Effect 2> Even when used in an industrial engine, it satisfies the crack suppression function at the branch point.
As illustrated in FIG. 1B, since a large gap (10) can be formed between the rib (7) and the cylinder head (9), heat radiation of the rib (7) is promoted, and the exhaust manifold is increased. Even when (8) is used in an industrial engine that requires high-load continuous operation, it is possible to satisfy the crack suppression function at the branch point (5).

<< Effect 3 >> It is possible to enhance the crack suppressing function at the branching point.
As illustrated in FIGS. 2A and 2B and FIGS. 4A and 4B, the combined exhaust outlet pipe (6) is led out from the branch point (5) in a direction along the mounting flanges (2a) and (3a). Since the rib (7) is derived from the outlet pipe flange side peripheral wall portion (6a) of the merged exhaust outlet pipe (6), the heat of the merged exhaust outlet pipe (6) is also smoothly radiated from the rib (7), The thermal expansion of the exhaust outlet pipe (6) is suppressed, and the crack suppressing function of the branch point (5) can be enhanced.

FIG. 1A is a plan view and FIG. 1B is a bottom view illustrating an exhaust manifold of an engine according to an embodiment of the present invention. FIG. 2A is a plan perspective view, and FIG. 2B is a bottom perspective view illustrating the exhaust manifold of FIG. 1. 3A and 3B are diagrams illustrating the exhaust manifold of FIG. 1, FIG. 3A being a side view seen from the cylinder head side, and FIG. 3B being a cross-sectional view taken along line IIIA-IIIA in FIG. 4A and 4B are diagrams illustrating the exhaust manifold of FIG. 1, in which FIG. 4A is a bottom view of the rib and its periphery, and FIG. 4B is a cross-sectional view taken along line BB of FIG.

  1 to 4 are diagrams for explaining an exhaust manifold of an engine according to an embodiment of the present invention. In this embodiment, an exhaust manifold of a vertical in-line four-cylinder diesel engine will be described.

As shown in FIG. 1 (A), the exhaust manifold (8) includes a pair of branched exhaust introduction pipes (2) and (3) and a branch point (5) of the pair of exhaust introduction pipes (2) and (3). 1, and a joining flange (2 a) (3 a) provided at each branch end of the pair of exhaust introduction pipes (2) and (3), and is illustrated in FIG. 1 (B). As described above, the rib (7) is installed at the branch point (5) of the pair of exhaust introduction pipes (2) and (3).
The pair of exhaust introduction pipes (2) and (3) are exhausted from the second cylinder exhaust introduction pipe (2) for introducing exhaust from the exhaust port (2b) of the second cylinder and the exhaust port (3b) of the third cylinder. A third cylinder exhaust introduction pipe (3) to be introduced, which are adjacent to each other.

The exhaust manifold (8) has a first cylinder exhaust introduction pipe (1) for introducing exhaust from the exhaust port (1b) of the first cylinder and a fourth cylinder exhaust introduction for introducing exhaust from the exhaust port (4b) of the fourth cylinder. A pipe (4) is also provided, and these are also branched from the branch point (5). Mounting flanges (1a) and (4a) are also provided at the branch ends of these exhaust introduction pipes (1) and (4).
Each exhaust port (1b) (2b) (3b) (4b) is provided in the cylinder head (9), and the exhaust manifold (8) is connected to the cylinder head by each mounting flange (1a) (2a) (3a) (4a). It is attached to (9).

  As shown in FIG. 1 (B), the rib (7) has a plate shape oriented along the mounting flanges (2a) and (3a), and is separated from the mounting flanges (2a) and (3a), and the exhaust introduction of the pair is performed. It is installed between the pipes (2) and (3).

2 (A) (B) and 4 (A) (B), the converging exhaust outlet pipe (6) is led out from the branching point (5) in the direction along the mounting flanges (2a) and (3a). The merged exhaust outlet pipe (6c) is opened at the outlet end of the merged exhaust outlet pipe (6), the outer peripheral surface of the combined exhaust outlet pipe (6) has a quadrangular prism peripheral surface shape, and one surface of the outer peripheral surface is attached to the flange (2a). ) (3a) side outlet pipe flange side peripheral surface (6b), this outlet pipe flange side peripheral surface (6b) is oriented along the mounting flange (2a) (3a), this outlet pipe flange side peripheral surface (6b) ), A rib (7) is led out from the outlet pipe flange side peripheral wall portion (6a) provided with the merging exhaust outlet (6c), and the rib (7) is connected to the outlet pipe flange side peripheral surface (6b). ) And the ends of the rib (7) are connected to the pair of exhaust introduction pipes (2) and (3).
As shown in FIGS. 2 (A), 2 (B), 4 (A), 4 (B), a pair of exhaust inlet pipes (2 (3) is formed continuously by integral molding by casting.

  All the mounting flanges (1a), (2a), (3a), and (4a) are rhombuses, tilted 45 ° in the same direction, and the same cylinder head (9) even when the exhaust manifold (8) is rotated 180 ° Can be attached to. However, when the exhaust manifold (8) is rotated 180 °, the direction of the combined exhaust outlet pipe (6) is also rotated 180 °.

(1) (First cylinder) Exhaust pipe
(1a) Mounting flange
(2) (2nd cylinder) Exhaust pipe
(2a) Mounting flange
(3) (3rd cylinder) Exhaust pipe
(3a) Mounting flange
(4) (4th cylinder) Exhaust pipe
(4a) Mounting flange
(5) Branch point
(6) Merged exhaust outlet pipe
(6a) Outlet pipe cylinder side wall
(6b) Outlet pipe flange side wall
(6c) Merged exhaust outlet
(7) Ribs
(8) Exhaust manifold
(9) Cylinder head
(10) Clearance

Claims (1)

A pair of exhaust introduction pipes (2) and (3) branched, a merged exhaust outlet pipe (6) led out from a branch point (5) of the pair of exhaust introduction pipes (2) and (3), and a pair of exhaust introduction pipes ( 2) A mounting flange (2a) (3a) provided at each branch end of (3),
In an exhaust manifold of an engine in which ribs (7) are installed at branch points (5) of the pair of exhaust introduction pipes (2) and (3),
The rib (7) has a plate-like shape along the mounting flanges (2a) (3a), and is separated from the mounting flanges (2a) (3a) and between the pair of exhaust introduction pipes (2) (3). Erection,
The merged exhaust outlet pipe (6) is led out from the branch point (5) in the direction along the mounting flanges (2a) and (3a), and the merged exhaust outlet (6c) is opened at the leading end of the merged exhaust outlet pipe (6). The outer peripheral surface of the combined exhaust outlet pipe (6) has a quadrangular prism shape, and one surface of the outer peripheral surface serves as an outlet pipe flange side peripheral surface (6b) on the side of the mounting flange (2a) (3a). The peripheral surface (6b) is oriented along the mounting flanges (2a) and (3a), and the combined exhaust outlet (6c) is provided from the outlet pipe flange side peripheral wall portion (6a) provided with the outlet pipe flange side peripheral surface (6b). The rib (7) is led out in the direction opposite to the side, the rib (7) is formed flush with the outlet pipe flange side peripheral surface (6b), and each end of the rib (7) is introduced into the exhaust pair. Engine exhaust manifold, characterized in that it is connected to pipes (2) and (3) .

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