JP2014185597A - Intake manifold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of fastening bolts used for fixing an intake manifold to a cylinder head while securing sealing performance.SOLUTION: An intake manifold 1 includes a plurality of branch pipe parts 3, a flange part 4 for connecting a downstream side end of each branch pipe parts 3, a second flange part 5 connecting the branch pipe parts 3 and separated from and opposed to the flange part 4, and a plurality of connection walls 6 positioned between the flange part 4 and the second flange part 5 and having one end connected to the second flange part 5 and the other end connected to the flange part 4, and the intake manifold 1 is fixed to a cylinder head of an internal combustion engine by a fastening bolt inserted into attachment holes 9 in the number equal to or less than the number of cylinders of the internal combustion engine formed in the flange part 4.

Description

  The present invention relates to a resin intake manifold.

  An intake manifold attached to a cylinder head of an internal combustion engine distributes intake air to each cylinder, and has a plurality of branch pipe portions and a flange portion connecting downstream ends of the branch pipe portions. The portion is fixed to the cylinder head with a plurality of fastening bolts.

  Such an intake manifold is generally configured such that the downstream end of each branch pipe portion is sandwiched between two of the plurality of fastening bolts, as disclosed in Patent Documents 1 and 2. It is fixed to the cylinder head of the internal combustion engine. Therefore, for example, in the case of an intake manifold attached to an in-line four-cylinder internal combustion engine, five flange portions that connect downstream ends of the branch pipe portions share one fastening bolt between adjacent cylinders. The fastening bolt is fixed to the cylinder head of the internal combustion engine.

  Here, when the intake manifold is made of resin instead of metal, the flange portion is close to the internal combustion engine, so that the rigidity is lowered due to the heat effect and is easily deformed. However, two downstream end openings of each branch pipe portion are provided. If it is fixed to the cylinder head so as to be sandwiched from both sides with the fastening bolts, it is possible to ensure the sealing performance between the intake manifold and the cylinder head.

  That is, the current intake manifold is fixed to the cylinder head with a larger number of fastening bolts than the number of cylinders of the internal combustion engine.

JP 2006-97522 A JP 2001-304058 A

  However, with the aim of reducing the total number of parts, if you try to reduce the number of fastening bolts that fix the intake manifold to the cylinder head to less than the number of cylinders of the internal combustion engine, especially in the case of resin intake manifolds, etc. There is a possibility that the deformation of the flange portion due to the above cannot be suppressed, and there is a possibility that a sufficient sealing performance between the intake manifold and the cylinder head cannot be secured.

  Therefore, the present invention has a plurality of branch pipe portions that distribute intake air to each cylinder of the internal combustion engine, and a flange portion that connects downstream ends of the branch pipe portions, and is formed in the flange portion. In a resin intake manifold fixed to a cylinder head of an internal combustion engine by fastening bolts inserted into a plurality of mounting holes, a second flange portion that connects the branch pipe portions and faces the flange portion apart from the flange portion And a plurality of connecting walls located between the flange portion and the second flange portion, one end connected to the second flange portion and the other end connected to the flange portion, and A number of the mounting holes equal to or less than the number of cylinders of the internal combustion engine are formed in the flange portion.

  Furthermore, you may make it connect adjacent branch pipe parts mutually by the said connection wall.

  According to the present invention, since the rigidity of the flange portion is relatively improved by providing the second flange portion and the plurality of connecting walls, and the deformation of the flange portion is suppressed, the number of fastening bolts for fixing the flange portion is reduced. Even when the number of cylinders of the internal combustion engine is less than the number of cylinders, the sealing performance between the intake manifold and the cylinder head can be ensured.

The perspective view of the intake manifold in 1st Example of this invention. Explanatory drawing which showed typically the principal part of the intake manifold in 1st Example of this invention. Explanatory drawing which showed typically the principal part of the intake manifold in 1st Example of this invention. The perspective view of the intake manifold in 2nd Example of this invention. Explanatory drawing which showed typically the principal part of the intake manifold in 2nd Example of this invention. Explanatory drawing which showed typically the principal part of the intake manifold in 3rd Example of this invention.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  1 to 3 are explanatory views schematically showing the intake manifold 1 of the first embodiment of the present invention. The intake manifold 1 of the first embodiment is applied to an in-line four-cylinder internal combustion engine.

  The intake manifold 1 is made of a synthetic resin material (for example, a polyamide-based synthetic resin material to which glass fibers are added), and as shown in FIGS. 1 and 2, a hollow collector portion 2 into which intake air is introduced, The same number (four in this embodiment) of branch pipes 3 that distribute the intake air in the collector part 2 to each cylinder, the flange part 4 that connects the downstream end of each branch pipe part 3, and each branch The pipe portion 3 is connected to the flange portion 4 and spaced apart from the second flange portion 5, and a plurality of connection walls 6 positioned between the flange portion 4 and the second flange portion 5. ing.

  The collector portion 2 is separated from the flange portion 4 and the second flange portion 5, and is formed in an elongated shape along the cylinder row direction (the left-right direction in FIG. 2).

  Each branch pipe portion 3 has a substantially cylindrical shape, and is formed so as to be curved in a substantially U shape as a whole. The branch pipe portion 3 is connected to the adjacent branch pipe portion 3 by the wall portion 7 at the upstream side, and partially connected to the branch pipe portion 3 at the downstream side thereof. It is connected by a wall 6 (first connecting wall 6a described later).

  The flange portion 4 has an elongated rectangular plate shape that continues along the cylinder row direction (the left-right direction in FIG. 2), and is formed so as to be orthogonal to the downstream end of each branch pipe portion 3. The flange portion 4 has a plurality of (three in this embodiment) fastening bolts (not shown) having a seating surface on the surface of the flange portion 4 via a gasket (not shown) made of a rubber material. Is fixed to the cylinder head 8 of the internal combustion engine.

  As shown in FIGS. 1 and 3, three attachment holes 9 into which the fastening bolts are inserted are formed in the flange portion 4, one at each end position and one at the center position. These three mounting holes 9a, 9b, 9c are provided in a staggered manner along the longitudinal direction of the flange 4 (the left-right direction in FIG. 3), and one end position of the flange 4 (the left end in FIG. 3). ) And the mounting hole 9b at the center of the flange portion 4 are set so that the downstream ends of the two branch pipe portions 3 on one end side (left side in FIG. 3) of the flange portion 4 are sandwiched, Two branch pipes on the other end side (right side in FIG. 3) of the flange portion 4 by the mounting hole 9c at the other end position (right end in FIG. 3) of the flange portion 4 and the mounting hole 9b at the center position of the flange portion 4. The downstream end of the portion 3 is set so as to be sandwiched.

  Therefore, the downstream end of the two branch pipe portions 3 on one end side (left side in FIG. 3) of the flange portion 4 is formed by a fastening bolt inserted into the mounting hole 9a and a fastening bolt inserted into the mounting hole 9b. It will be caught. Moreover, the downstream end of the two branch pipe portions 3 on the other end side (right side in FIG. 3) of the flange portion 4 includes a fastening bolt inserted into the mounting hole 9c, a fastening bolt inserted into the mounting hole 9b, Will be pinched by. That is, the downstream end of the two branch pipe portions 3 is sandwiched from both sides by two fastening bolts. A metal collar 10 is inserted into each mounting hole 9a, 9b, 9c for reinforcement. In addition, 11 in FIG. 1, FIG. 2 is the thinning part set to the flange part 4. FIG.

  The second flange portion 5 has an elongated rectangular plate shape that continues along the cylinder row direction (left-right direction in FIG. 2), and is formed to be parallel to the flange portion 4. The second flange portion 5 is formed to have a shorter length in the longitudinal direction than the flange portion 4 and is set so as not to cover the mounting holes 9 a and 9 c located at both ends of the flange portion 4. In addition, the second flange portion 5 is formed with a cutout portion 12 cut out in a substantially U shape at a substantially central position thereof. The notch 12 is set so as not to cover the upper part of the attachment hole 9 b formed at the center position of the flange 4. In addition, 13 in FIG. 1, FIG. 2 is the thinning part set to the 2nd flange part 5. FIG.

  Each connection wall 6 has one end connected to the second flange portion 5, the other end connected to the flange portion 4, and is formed to be orthogonal to the flange portion 4 and the second flange portion 5.

  Here, the connection wall 6 is roughly divided into a plurality of first connection walls 6a, a plurality of second connection walls 6b, and a plurality of third connection walls 6c. The 1st connection wall 6a is formed so that the adjacent branch pipe parts 3 and 3 may be connected. The second connection wall 6 b is formed so as to be connected to the outer peripheral surface of one branch pipe portion 3. The third connecting wall 6c is set so as not to be connected to the branch pipe portion 3. In the present embodiment, all the third connection walls 6c are connected to the first connection wall 6a.

  In such an intake manifold 1 of the first embodiment, a second flange portion 5 that faces the flange portion 4 is set, and the second flange portion 5 and the flange portion 4 are connected by a plurality of connecting walls 6. Thus, the rigidity of the flange portion 4 fixed to the cylinder head 8 can be relatively improved.

  Therefore, deformation of the flange portion 4 due to heat or the like is suppressed, the number of mounting holes 9 is set to a number equal to or less than the number of cylinders of the internal combustion engine (three in this embodiment), and the number of fastening bolts for fixing the flange portion 4 is reduced. Thus, even when the number of cylinders of the internal combustion engine is equal to or less than the number of cylinders (three in this embodiment), the sealing performance between the intake manifold 1 and the cylinder head 8 can be sufficiently ensured. In other words, even if the number of fastening bolts for fixing the flange portion 4 is reduced to be equal to or less than the number of cylinders of the internal combustion engine, the downstream end of the branch pipe portion 3 of the intake manifold 1 and the intake port ( (Not shown) can be connected in an airtight manner. In this embodiment, the downstream ends of the two branch pipe portions 3 are sandwiched between two fastening bolts, and substantially two downstream ends of each branch pipe portion 3 are provided. Between the intake manifold 1 and the cylinder head 8 even if the number of fastening bolts for fixing the flange portion 4 is reduced to a number equal to or less than the number of cylinders of the internal combustion engine. The sealing property can be secured.

  And, by relatively reducing the number of fastening bolts for fixing the flange portion 4, the total number of parts can be reduced as a whole (specifically, the number of fastening bolts and the number of collars 10). The cost can be reduced and the productivity can be improved by shortening the working time when the intake manifold 1 is attached to the cylinder head 8 of the internal combustion engine.

  Further, since the adjacent branch pipe portions 3 are connected to each other by the connecting wall 6a, the flange portion 4 is advantageous in improving the rigidity along the longitudinal direction (left-right direction in FIG. 3). It has a configuration.

  Further, the seating surface of the fastening bolt is set to the flange portion 4, and the fastening bolt does not need to pass through the second flange portion 5. Therefore, by setting the second flange portion 5, the fastening bolt There is also no need to relatively increase the length of.

  Hereinafter, other embodiments of the present invention will be described, but the same components as those in the first embodiment described above are denoted by the same reference numerals, and redundant description will be omitted.

  A second embodiment of the present invention will be described with reference to FIGS. The intake manifold 21 of the second embodiment is applied to an in-line four-cylinder internal combustion engine and has substantially the same configuration as the intake manifold 1 of the first embodiment described above, but the fastening bolt is inserted therein. Three mounting holes 9a, 9b, 9c are provided in a straight line along the longitudinal direction of the flange portion 4 (the left-right direction in FIG. 5). Further, a through hole 22 is formed in the second flange portion 5 at a substantially central position. The through hole 22 is set so as not to cover the upper portion of the attachment hole 9 b formed at the center position of the flange portion 4.

  In the second embodiment as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment described above.

  Further, the present invention can be applied to other than an in-line four-cylinder internal combustion engine. For example, when applied to an in-line three-cylinder internal combustion engine, for example, as in the third embodiment shown in FIG. The same number of mounting holes 9 may be set. Therefore, in the intake manifold 31 of the third embodiment, the flange portion 4 is fixed to the cylinder head 8 by the same number of fastening bolts as the number of cylinders.

  The intake manifold 31 in the third embodiment has substantially the same configuration as the intake manifold 1 of the first embodiment described above, and the three mounting holes 9 into which the fastening bolts are inserted are formed in the longitudinal direction of the flange portion 4 (see FIG. 6 are provided in a zigzag shape along the left and right directions in FIG. 6, but one mounting hole 9 is formed at each end position of the flange portion 4 and at a position closer to the other end side (right side in FIG. 6) than the center. Has been.

  Then, one end side (in FIG. 6) of the flange portion 4 is formed by an attachment hole 9a at one end position (left end in FIG. 6) of the flange portion 4 and an attachment hole 9b at a position closer to the other end side than the center of the flange portion 4. The left end) is set so that the downstream ends of the two branch pipe portions 3 are sandwiched between the mounting hole 9c at the other end position (the right end in FIG. 6) of the flange portion 4 and the other end side from the center of the flange portion 4. The downstream end of one branch pipe portion 3 located at the other end (the right end in FIG. 6) of the flange portion 4 is set so as to be sandwiched by the mounting hole 9b at the close position.

  Therefore, the downstream end of the two branch pipe portions 3 on one end side (left side in FIG. 6) of the flange portion 4 is formed by a fastening bolt inserted into the mounting hole 9a and a fastening bolt inserted into the mounting hole 9b. It will be caught. Moreover, the downstream end of one branch pipe part 3 located in the other end (right side end in FIG. 6) of the flange part 4 is a fastening bolt inserted into the mounting hole 9c and a fastening bolt inserted into the mounting hole 9b. And will be sandwiched between. That is, when applied to an in-line three-cylinder internal combustion engine, the downstream end of two adjacent branch pipe portions 3 among the three branch pipe portions 3 of the intake manifold 31 is sandwiched from both sides by two common fastening bolts, The downstream end of the remaining one branch pipe part 3 is sandwiched from both sides by two fastening bolts alone.

DESCRIPTION OF SYMBOLS 1 ... Intake manifold 3 ... Branch pipe part 4 ... Flange part 5 ... 2nd flange part 6 ... Connection wall 8 ... Cylinder head 9 ... Mounting hole 12 ... Notch part

Claims (2)

A plurality of branch pipe portions for distributing intake air to each cylinder of the internal combustion engine; and a flange portion for connecting downstream ends of the branch pipe portions, and inserted into a plurality of mounting holes formed in the flange portions. In the resin intake manifold fixed to the cylinder head of the internal combustion engine by the tightened fastening bolt,
The branch pipes are connected to each other, and are located between the flange part and the second flange part, and one end is connected to the second flange part. A plurality of connecting walls whose other ends are connected to the flange portion,
The intake manifold according to claim 1, wherein the number of mounting holes equal to or less than the number of cylinders of the internal combustion engine is formed in the flange portion.   The intake manifold according to claim 1, wherein adjacent branch pipe portions are connected to each other by the connecting wall.

Images