JP3735838B2 - Exhaust manifold - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an exhaust manifold.
[0002]
[Prior art and problems]
Conventionally, as shown in FIG. 3, an exhaust passage 3 through which exhaust gas passes is formed in an exhaust manifold 2 attached to the cylinder head 1, and a water passage pipe 51 through which a plurality of water passes is formed in the exhaust passage 3. However, such an exhaust manifold is made of stainless steel and requires the water passage pipe 51 to be assembled by welding or the like, which is complicated and large. When the exhaust manifold is made of cast iron, the heat transfer rate is poor, so there are more exhaust heat recovery fins in the water passage. It is also necessary to provide a sheet, and at the time of casting, the casting sand is seized due to the fins and the sand does not fall, and the water passage may be clogged, making it difficult to commercialize, large in weight and large in size When Cormorants there is a problem.
[0003]
In order to solve such problems, as shown in the enlarged sectional view of FIG. 4, the outer periphery of the exhaust passage 3 of the exhaust manifold 2 attached to the cylinder head 1 by fastening the flange portion 21 with the fastening bolts 9 and 9. In addition, a configuration has been proposed in which the water passages 4 and 4 covered with the cover 5 are formed, and the exhaust heat is recovered satisfactorily by the cooling water flowing in the water passage 4. The passage pipe 51 is unnecessary, and it is easy to manufacture and can be reduced in size and weight. However, if the water passage 4 is formed to the vicinity of the flange portion 21, it is tightened outside the water passage 4. The bolt 9 must be tightened, and the dimension a between the tightening bolt 9 and the exhaust passage 3 must be large. If the dimension a is large, the sealing performance deteriorates. Increasing thickness b and furan It is necessary to increase the rigidity of the portion 21 or to use a gasket 8 having high sealing performance, and it is necessary to increase the tightening force by increasing the tightening bolt 9 to increase the diameter. In addition, there is a problem that the weight increases because the flange portion 21 is thickened.
[0004]
[Means for Solving the Problems]
The present invention has been devised in view of the above-mentioned conventional problems, and aims to provide an exhaust manifold that can be reduced in size and weight and can be manufactured at low cost. The first aspect of the present invention is to cover the outer periphery of the exhaust passage. In the exhaust manifold, which is formed by forming a water passage covered with a cylinder and is attached to the cylinder head by tightening a tightening bolt, a flange portion protruding outward to the cylinder head side and integrally formed on the outer peripheral side of the exhaust passage; Tightening the fastening bolts that are integrally formed protruding in a direction away from the exhaust port at a distance from the flange portion, and that the end face on the direction side away from the exhaust port is formed in a vertical wall surface portion A boss portion, a substantially horizontal horizontal wall surface portion formed at the lower end of the vertical wall surface portion, and a mountain-shaped partition projection that is continuously formed on the horizontal wall surface portion, At the upper ends of the lunge portion, the tightening boss portion, and the partition projection, an obliquely inclined seal surface is formed, and a water passage cover is provided on the seal surface, and the water passage cover That is , a working opening for fastening the fastening bolt is formed at a position corresponding to the vertical wall surface .
The second gist includes a dam protrusion integrally formed in a direction away from the exhaust port of the partition protrusion, the seal surface is formed at an upper end of the dam protrusion, and the water passage The cover is provided on the sealing surface .
[0005]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an enlarged cross-sectional view of the exhaust manifold, and shows an enlarged YY cross section of FIG.
[0006]
In the figure, an exhaust passage 3 is formed in the exhaust manifold 2 that is tightened and fixed to the exhaust port of the cylinder head 1 with a gasket 8 interposed in alignment, and is in communication with the exhaust port of the cylinder head. A flange portion 21 is integrally formed on the outer peripheral side of the exhaust passage 3 so as to protrude outward on the cylinder head 1 side, and a fastening boss portion 22 is integrally protruded on the right side of the drawing at a distance from the flange portion 21. The right end surface of the fastening boss portion 22 is a vertical wall surface portion 22a, and the fastening bolt 9 can be fastened to this portion.
In addition, a substantially horizontal horizontal wall surface portion 23 is formed at the lower end of the vertical wall surface portion 22a, and a partition projection 24 is continuously formed in a mountain shape at the right end of the horizontal wall surface portion 23. A second upper water passage 4 b is formed between the weir projections 25.
[0007]
The upper end of the flange 21 shown in the drawing, the upper end of the fastening boss 22, the upper end of the partition projection 24, and the upper end of the weir projection 25 are inclined first and second seal surfaces 7 a, 7 b, 3 seal surface 7c and 4th seal surface 7d are formed, and on this seal surface 7a, 7b, 7c, 7d, an upper cover 5a for water passage is covered with a seal member interposed, The seal surfaces 7a, 7b, 7c, and 7d are sealed by the same surface in the oblique direction by the cover 5a. Thereby, the first upper water passage 4a is formed in a concave shape between the flange portion 21 and the fastening boss portion 22, and the second upper water passage 4b is formed between the partition projection 24 and the weir projection 25. The cooling water is configured to pass through the water passages 4a and 4b, respectively.
Also, at the lower part, the flange portion 21 and the weir protrusion 25 are projected, and the space between them is a concave lower water passage 4, which is covered with a lower cover 5 b for water passage, The flange 21 and the sealing surfaces 7a and 7d on the outer periphery of the lower end of the dam protrusion 25 are sealed on the same surface in the oblique direction by the water passage lower cover 5b.
[0008]
Taking the water passage upper cover 5a as an example, the water passage upper cover 5a has work openings 6 such as a rectangular shape formed at predetermined intervals as shown in FIG. A hand can be put into the work opening 6 from the outside and the tightening bolt 9 can be tightened to the tightening boss part 22 well, and the tightening bolt 9 can be tightened well through each work opening 6. Work can be performed, and by tightening the tightening bolt 9, the flange portion 21 can be firmly fixed to the cylinder head 1 side with the gasket 8 interposed.
In FIG. 2, reference numeral 10 denotes a fixing bolt for attaching the covers 5a and 5b.
[0009]
Since the water passages 4, 4a, 4b can be formed on the outer peripheral side of the exhaust passage 3 by covering the covers 5a, 5b in this way, the conventional water passage pipe 51 is unnecessary and manufactured. It is easy to assemble and can be assembled at low cost, and can be reduced in size and weight.
In addition, the tightening position of the tightening bolt 9 is closer to the center of the exhaust passage 3 than in the prior art, that is, the dimension a between the center of the exhaust passage 3 and the tightening bolt 9 can be set shorter than the prior art. The sealing performance against the cylinder head 1 is ensured satisfactorily, the thickness b of the flange portion 21 can be set thinner than the conventional one, and the dimension of the tightening bolt 9 is set smaller than the conventional one. Thus, good sealing properties can be ensured.
[0010]
Therefore, the covers 5a and 5b and the entire exhaust manifold 2 can be made of aluminum, so that the weight can be further reduced, and a water passage 4a through which cooling water passes is formed between the fastening boss portion 22 and the flange portion 21. Therefore, the tightening boss portion 22 is cooled well and is less affected by the thermal stress due to the heat of the exhaust gas, so that it becomes easier to form aluminum and the tightening bolt 9 needs to be a heat-resistant material bolt. Therefore, it can be manufactured at low cost using ordinary bolts.
If the whole is made of aluminum, the heat transfer rate is improved, and the exhaust heat recovery performance is further improved.
[0011]
【The invention's effect】
According to the present invention, a water passage covered with a cover is formed on the outer periphery of the exhaust passage, and in an exhaust manifold attached to the cylinder head by tightening a tightening bolt, the exhaust passage projects outwardly toward the cylinder head and A flange portion integrally formed on the outer peripheral side, and a protruding portion formed integrally in a direction away from the exhaust port at a distance from the flange portion, and an end surface on the direction side away from the exhaust port formed on a vertical vertical wall surface portion A tightening boss portion for tightening the tightened bolts, a substantially horizontal horizontal wall surface portion formed at the lower end of the vertical wall surface portion, and a mountain-shaped partition projection protrudingly formed on the horizontal wall surface portion. Provided with an obliquely inclined sealing surface at the upper end of the flange portion, the fastening boss portion, and the partition projection, and a water passage cover is provided on the sealing surface. In addition, a working opening for tightening the tightening bolt is formed at a position corresponding to the vertical wall surface of the water passage cover, and the partition projection is integrated in a direction away from the exhaust port. The sealing surface is formed on the upper end of the weir protrusion, and the water passage cover is covered on the sealing surface, so that the cover is covered with the cover and the exhaust passage is satisfactorily formed. Because the water passage through which the cooling water passes can be formed on the outer periphery of the steel, it is easy to manufacture, can be formed inexpensively with fewer parts, and the tightening position of the tightening bolt is close to the exhaust passage Therefore, it is possible to ensure a good sealing performance against the cylinder head, so that it is not necessary to increase the overall rigidity, and the exhaust manifold is reduced in size and weight, and the tightening bolt is provided on the cover. Easily can be performed fastening work from work opening, manufacture and maintenance is easy.
[Brief description of the drawings]
1 is an enlarged cross-sectional view of an exhaust manifold attached to a cylinder head, and is a cross-sectional view taken along line YY in FIG.
FIG. 2 is a partially broken external view of the exhaust manifold attached state.
FIG. 3 is a partially broken external view of a conventional exhaust manifold having a structure in which a water passage pipe is provided.
FIG. 4 is an enlarged cross-sectional view of a conventional exhaust manifold in which a water passage is formed on the outer periphery.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylinder head 2 Exhaust manifold 3 Exhaust passage 4, 4a, 4b Water passage 5, 5a, 5b Cover 6 Work opening 7a, 7b, 7c, 7d Seal surface 8 Gasket 9 Tightening bolt 21 Flange portion 22 Tightening boss portion 22a Vertical wall portion 24 Partition projection 25 Weir projection

Claims (2)

In the exhaust manifold, which is formed with a water passage covered with a cover on the outer periphery of the exhaust passage, and is attached to the cylinder head by tightening a tightening bolt.
A flange portion protruding outward on the cylinder head side and integrally formed on the outer peripheral side of the exhaust passage;
A tightening boss for tightening the tightening bolt, which is integrally formed in a direction away from the exhaust port at a distance from the flange portion and whose end surface on the side away from the exhaust port is formed on a vertical wall surface And
A substantially horizontal horizontal wall surface formed at the lower end of the vertical wall surface;
A mountain-shaped partition projection formed continuously on the horizontal wall surface;
With
At the upper ends of the flange portion, the tightening boss portion, and the partition projection, an obliquely inclined seal surface is formed, and a water passage cover is provided on the seal surface. An exhaust manifold , wherein an operation opening for tightening the tightening bolt is formed at a position corresponding to the vertical wall surface . A weir protrusion integrally formed in a direction away from the exhaust port of the partition protrusion, the seal surface is formed at an upper end of the weir protrusion, and the water passage cover is provided over the seal surface exhaust manifold according to claim 1, characterized in that the.

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