JP2010223160A - Manifold installing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manifold installing structure capable of securing adhesion between a cylinder head and a manifold while restraining deterioration in cylinder head workability. <P>SOLUTION: The manifold installing structure has a first tapered part 22 formed at one end of a flange 21 of the manifold 20, a second tapered part 23 formed at the other end of the flange 21, an adapter 40 forming a first abutting part 41 abutting on the first tapered part 22, a receiving part 30 forming a second abutting part 31 abutting on the second tapered part 23, a first bolt insertion hole 24 formed at the flange 21 in a position for arranging the first tapered part 22, and a second bolt insertion hole 42 formed at the adapter 40 in a position for arranging the first abutting part 41 so as to be threaded. A bolt 51 is engaged with a female screw 13 of the cylinder head 10 from the orthogonal direction to an installation surface 12A of the cylinder head 10 for installing the manifold 20, and the flange 21 is brought into close contact with the cylinder head 10 via the adapter 40 and the receiving part 30. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a structure for attaching a manifold to a cylinder head.

  Patent Document 1 discloses a structure in which the lower portion of the flange of the exhaust manifold is fitted into a receiving portion provided in the cylinder head, and the exhaust manifold is attached to the cylinder head by a bolt inserted obliquely from above into the upper portion of the flange. .

German Patent Application No. 20319486

  In the exhaust manifold mounting structure described in Patent Document 1, it is necessary to form the female thread portion into which the bolt is screwed into the cylinder head by inclining with respect to the mounting surface. However, a processing device that forms a screw hole in a cylinder head generally forms an internal thread portion perpendicular to the mounting surface. In such an existing processing device, the internal thread portion is inclined and formed in the cylinder head. Therefore, there is a problem that the apparatus must be improved.

  Therefore, the present invention has been made paying attention to such problems, and provides a manifold mounting structure capable of ensuring the close contact between the cylinder head and the manifold while suppressing deterioration of the workability of the cylinder head. With the goal.

  The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected, it is not limited to this.

  In the manifold mounting structure in which the manifold (20) is attached to the cylinder head (10) by screwing the bolt (51) into the female thread portion (13) of the cylinder head (10), the upstream end of the manifold (20) is provided. A flange (21) formed on the flange (21), a first taper portion (22) provided at one end of the flange (21) and inclined so that the flange thickness becomes thinner toward the one end side, and the flange (21) A second taper portion (23) that is provided at the end and inclines so that the flange thickness becomes thinner toward the other end side, and a first contact portion (41) that contacts the first taper portion (22) are formed. An adapter (40) disposed between the flange (21) and the bolt head of the bolt (51), and a second contact portion (31) that contacts the second taper portion (23). The first bolt insertion hole (24) that is formed in the receiving portion (30) installed in the lid (10) and the flange (21) at the position where the first taper portion (22) is provided and through which the bolt (51) is inserted. ) And a second bolt insertion hole (42) through which the bolt (51) is inserted, and the manifold (20) is attached to the adapter (40) at a position where the first contact portion (41) is provided. The bolt (51) is screwed into the female thread portion (13) of the cylinder head (10) from the direction orthogonal to the mounting surface (12A) of the cylinder head (10) to be mounted, and the adapter (40) and the receiving portion (30) The flange (21) is closely attached to the cylinder head (10) via

  According to the present invention, since the manifold is attached to the cylinder head by the bolt via the adapter having the first contact portion, the bolt can be screwed into the female thread portion of the cylinder head from the direction orthogonal to the attachment surface. . Therefore, the threaded hole of the cylinder head can be formed by an existing processing apparatus, and deterioration of the cylinder head processability can be suppressed.

  Further, the second taper portion of the flange is brought into contact with the second contact portion of the receiving portion, and the bolt is attached to the cylinder head in a state where the first taper portion of the flange and the first contact portion of the adapter are in contact. Since it is screwed into the female thread portion, the flange can be pressed against the cylinder head by the tightening force of the bolt, and the adhesion between the cylinder head and the manifold can be ensured.

It is a schematic block diagram of the exhaust system of the engine for vehicles. It is a perspective view of an engine exhaust system. It is drawing explaining the adhesiveness of an exhaust manifold and a cylinder head.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3.

  FIG. 1 is a schematic configuration diagram of an exhaust system of an engine 100 for a vehicle. FIG. 2 is a perspective view of the exhaust system of engine 100.

  As shown in FIG. 1, the engine 100 includes a cylinder head 10 and an exhaust manifold 20.

  An exhaust port 11 is formed in the cylinder head 10 for each cylinder of the engine 100. The upstream end of the exhaust manifold 20 is connected to a mounting surface 12A provided on the side portion 12 of the cylinder head 10 on the exhaust port 11 side. The exhaust manifold 20 is attached to the cylinder head 10 by a receiving portion 30, an adapter 40 and a bolt 51. On the side portion 12 of the cylinder head 10, female screw portions 13 and 14 are formed in which a bolt 51 for fixing the exhaust manifold 20 and a bolt 52 for fixing the receiving portion 30 are screwed together. These female screw portions 13 and 14 are formed in a direction orthogonal to the mounting surface 12A (hereinafter referred to as “orthogonal direction”).

  The exhaust manifold 20 is an exhaust pipe that collects exhaust from each exhaust port 11 and flows it downstream.

  A plate-like flange 21 is formed at the upstream end of the exhaust manifold 20. The flange 21 includes a first taper portion 22, a second taper portion 23, and an insertion hole 24.

  The first tapered portion 22 is formed as an inclined surface outside the upper end of the flange 21. The first taper portion 22 is formed so that the flange thickness becomes thinner as it approaches the upper end of the flange 21, and the flange thickness at the upper end position becomes the thinnest.

  An insertion hole 24 through which the bolt 51 is inserted is formed in the flange 21 at the position where the first tapered portion 22 is formed. A plurality of insertion holes 24 are provided in the flange width direction, which is the same direction as the cylinder arrangement direction.

  The second taper portion 23 is formed as an inclined surface outside the lower end of the flange 21. The second taper portion 23 is formed so that the flange thickness becomes thinner as it approaches the lower end of the flange 21, and the flange thickness at the lower end position becomes the thinnest.

  The receiving portion 30 is fixed to the side portion 12 of the cylinder head 10 by a bolt 52 below the exhaust manifold 20. The receiving portion 30 is a member that supports the lower end side of the flange 21 of the exhaust manifold 20, and is screwed into the contact portion 31 that contacts the second tapered portion 23 of the exhaust manifold 20 and the female screw portion 14 of the cylinder head 10. And an insertion hole 32 through which the bolt 52 to be inserted is inserted.

  The contact portion 31 is formed as an inclined surface that comes into surface contact with the second tapered portion 23 in a state where the receiving portion 30 is fixed to the cylinder head 10.

  As shown in FIG. 2, a plurality of receiving portions 30 are arranged in the flange width direction, more specifically, three. The number of receiving portions 30 is not limited to this, and the receiving portions 30 may be extended in the cylinder arrangement direction to be configured as one receiving portion.

  The adapter 40 is a rod-like member extending in the flange width direction as shown in FIG. 2, and is disposed between the flange 21 of the exhaust manifold 20 and the bolt head of the bolt 51 as shown in FIG. . The adapter 40 includes a contact portion 41 that contacts the first taper portion 22 of the exhaust manifold 20 and an insertion hole 42 through which a bolt 51 that is screwed into the female thread portion 13 of the cylinder head 10 is inserted.

  The contact portion 41 is formed as an inclined surface that is in surface contact with the first tapered portion 22.

  The insertion hole 42 is formed so that the bolt 51 is inserted at a position where the contact portion 41 is formed. A plurality of insertion holes 42 are provided in the flange width direction.

  As shown in FIG. 1, the exhaust manifold 20 is configured such that the second taper portion 23 of the flange 21 contacts the contact portion 31 of the receiving portion 30 in a state where the flange 21 is aligned with the mounting surface 12 </ b> A of the cylinder head 10. It is placed on the receiving part 30. And the 1st taper part 22 of the flange 21 and the contact part 41 of the adapter 40 are contact | abutted, the volt | bolt 51 is inserted in the insertion holes 42 and 24 from an orthogonal direction, and is screwed together with the internal thread part 13 of the cylinder head 10. FIG. . Thus, the exhaust manifold 20 is attached to the cylinder head 10 by fixing the upper end side of the flange 21 to the cylinder head 10 via the adapter 40 with the bolts 51.

  Next, the adhesion between the exhaust manifold 20 and the cylinder head 10 will be described with reference to FIG.

  When the bolt 51 is screwed into the female thread portion 13 of the cylinder head 10 from the orthogonal direction, a drawing force of the bolt 51 is generated. Since the adapter 40 includes the contact portion 41 and the flange 21 includes the first taper portion 22 in surface contact with the contact portion 41, the tightening force of the bolt 51 in the first taper portion 22 of the flange 21 is expressed by the vector F1. As shown, it occurs in a diagonally downward direction. The tightening force acts to press the upper end side of the flange 21 against the cylinder head 10 and also acts to push down the entire flange 21.

  Since the lower end side of the flange 21 is supported from the lower side of the exhaust manifold 20 by the receiving portion 30 fixed to the cylinder head 10, when the flange 21 is pushed down, a reaction force is applied to the second tapered portion 23 of the flange 21. appear. Since the receiving portion 30 includes the contact portion 31, and the flange 21 includes the second taper portion 23 that is in surface contact with the contact portion 31, the reaction force in the second taper portion 23 is obliquely upward as indicated by the vector F2. Occurs. This reaction force acts to press the lower end side of the flange 21 against the cylinder head 10 and to push up the entire flange 21.

  In this way, the upper end side and the lower end side of the flange 21 are pressed against the cylinder head 10 by the tightening force of the bolts 51, so that the adhesion between the cylinder head 10 and the exhaust manifold 20 can be ensured.

  As described above, in the manifold mounting structure of the present embodiment, the following effects can be obtained.

  The exhaust manifold 20 is attached to the cylinder head by a bolt 51 via an adapter 40 that includes an abutting portion 41 that abuts on the first tapered portion 22 of the flange 21. Therefore, the bolt 51 can be screwed into the female thread portion 13 of the cylinder head 10 from the orthogonal direction. Thereby, the threaded hole processing of the cylinder head 10 can be performed by the existing processing apparatus, and deterioration of the cylinder head processability can be suppressed.

  Further, the second taper portion 23 of the flange 21 is brought into contact with the contact portion of the receiving portion 30 at 32, and the first taper portion 22 of the flange 21 and the contact portion 41 of the adapter 40 are brought into contact with each other. Since the bolt 51 is screwed into the female thread portion 13 of the cylinder head 10, the upper end side and the lower end side of the flange 21 can be pressed against the cylinder head 10 by the tightening force of the bolt 51, and the cylinder head 10 and the exhaust manifold 20 Adhesion can be ensured.

  When the adapter 40 is configured as a rod-like member extending in the flange width direction, and the upper end side of the exhaust manifold 20 is pressed over the flange width direction, a plurality of adapters 40 are provided in the flange width direction like the receiving portion 30. Compared with, the area which contacts the 1st taper part 22 can be expanded. Thereby, the adhesiveness of the cylinder head 10 and the exhaust manifold 20 can be improved, and the opening at the upper end of the flange 21 due to thermal degradation can be suppressed.

  Note that the present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

  Although the present embodiment has been described with respect to the case where the exhaust manifold 20 is attached to the cylinder head 10, the idea of the present invention can also be applied to the case where the intake manifold is attached to the cylinder head 10.

100 Engine 10 Cylinder head 11 Exhaust port 12A Mounting surface 13 Female thread portion 20 Exhaust manifold 21 Flange 22 First taper portion 23 Second taper portion 24 Insertion hole (first bolt insertion hole)
30 receiving part 31 contact part (second contact part)
32 Insertion hole 40 Adapter 41 Abutting part (first joint part)
42 Insertion hole (second bolt insertion hole)
51 volts

Claims (3)

In the manifold mounting structure where the manifold is attached to the cylinder head by screwing the bolt into the internal thread of the cylinder head,
A flange formed at the upstream end of the manifold;
A first tapered portion that is provided at one end of the flange and is inclined so that the flange thickness becomes thinner toward the one end side;
A second taper portion that is provided at the other end of the flange and is inclined so that the flange thickness becomes thinner toward the other end side;
A first abutting portion that abuts on the first tapered portion, and an adapter disposed between the flange and a bolt head of the bolt;
A second abutting portion that abuts on the second taper portion, and a receiving portion installed on the cylinder head;
A first bolt insertion hole formed in the flange at a position where the first taper portion is provided, and through which the bolt is inserted;
A second bolt insertion hole formed in the adapter at a position where the first abutment portion is provided, and through which the bolt is inserted,
The bolt is screwed into the female thread portion of the cylinder head from a direction orthogonal to the mounting surface of the cylinder head to which the manifold is mounted, and the flange is brought into close contact with the cylinder head via the adapter and the receiving portion. ,
Manifold mounting structure characterized by this. The adapter is a rod-like member extending across the width direction of the flange.
The manifold mounting structure according to claim 1, wherein: The manifold is an exhaust manifold;
The manifold mounting structure according to claim 1 or 2, characterized in that

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