JPH0320535Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention mainly relates to an intake pipe installed in an intake passage of an automobile engine.

[Prior Art] The intake pipe that distributes the intake air that has passed through the throttle body to each cylinder usually has a mounting flange integrally formed at its end, and the end surface of this flange is used to connect the air formed in the intake pipe. Passage ports, bolt holes for mounting, etc. are opened. The intake pipe is connected to other members by bringing the flange into contact with a corresponding mounting surface of the engine body, etc., and tightening and fixing the flange with a bolt inserted through the bolt hole.

However, if the end face of the flange is simply crimped onto the mounting surface of another member and then tightened and fixed with bolts, there is a risk that the flange portion may lack strength and rigidity or may not be maintained over a long period of time. Therefore, as the prior art of this invention,
As shown in Japanese Patent No. 58-79064, there is also one in which a rib is provided protruding between the lower side of the intake pipe and the flange portion.

[Problems to be solved by the invention] However, with the prior art as shown in the above, although it is possible to ensure the strength and rigidity of the lower side of the flange against loads etc. from the intake pipe side, The strength and rigidity of the upper side cannot necessarily be said to be sufficient. In other words, with such a device, the strength and rigidity of the upper part of the flange cannot be ensured sufficiently over a long period of time, and as a result, uneven surface pressure between the upper and lower parts of the port causes the gap between the upper part of the flange and the corresponding mounting surface to deteriorate. There is a risk of creating a gap.

Generally, by making the flange larger or increasing its thickness, it is possible to increase the strength and rigidity of the flange part and ensure surface pressure, but this will increase the overall weight and increase the thickness of the flange. This is not desirable as it leads to higher costs. Additionally, if the flange portion is simply made larger or made thinner to reduce weight, the end surface will warp, causing uneven surface pressure on the flange surface when installed and causing a decrease in rigidity, etc. It also becomes.

An object of the present invention is to provide an intake pipe that can relatively easily eliminate such problems.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an intake pipe in which a plurality of ports are opened on the end face of a flange, and the flange is provided on both sides of the center of the arrangement of each port. A plurality of continuous ribs are formed, bolt holes are provided at a plurality of points surrounding each port, and at least one of the ribs is placed close to each other in correspondence with each bolt hole, and a bolt inserted through these bolt holes is provided. It is characterized in that the flange is tightened and fixed to the corresponding mounting surface via the flange.

[Operation] According to such a configuration, the plurality of ribs formed on the opposite end surface side of the flange ensure the rigidity of the peripheral portion of each port on both sides of the center in the arrangement direction of the ports. Therefore, by inserting bolts into the bolt holes formed at multiple points surrounding each port and tightening and fixing the end face of the flange to the corresponding mounting surface, the rigidity of the flange is exerted by the rib portion etc., and each The surface pressure of the flange is increased in the peripheral portion of each port surrounded by bolt holes, ribs, etc., and it is possible to maintain it substantially uniformly. Moreover, each of the ribs is continuous with the flange on both sides sandwiching the center of the port arrangement, and the ribs are close to the bolt holes surrounding each port, so when the bolt is tightened, the tightening force is is also distributed to the surrounding area by these ribs. Therefore, even if the flange is thin, the surface pressure can be made uniform throughout.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a plan view of an intake pipe according to the present invention. In the drawing, 1 indicates an automobile engine body, and 2 indicates an intake pipe fixed to the cylinder head thereof.

The intake pipe 2 is interposed between the surge tank connected to the downstream side of the throttle body and the intake port of the engine body 1, and is for guiding the intake air in the surge tank to each cylinder. Flanges 3 and 4 are integrally formed.

One flange 3 located on the upstream side of the intake air is
It is designed to be connected to a flange formed at the lower end of the branch pipe extending from the surge tank, and the end face 3a has air holes formed in a row direction in each of the branch parts 5 to 8. A plurality of bolt holes 9 are opened for connection to one of the ports 5b to 8b of the passages 5a to 8a via bolts. The other flange 4 located on the downstream side of the intake air is tightened and fixed to the mounting surface 1a (end surface of the cylinder head) of the corresponding engine body 1 via bolts 10, 11, and the end surface 4a is tightened and fixed. are the other ports 5c to 8c of the air passages 5a to 8a, which communicate with the intake port in the cylinder head;
A plurality of bolt holes 12 and 13 are opened for connection.

Then, on both sides of the array center m of each of these ports 5c to 8c, specifically, a plurality of ribs 14, 15 are positioned above and below the array center m when the intake pipe 2 is attached, and on the side opposite to the ports. has been formed. The ribs 14 located above the array center m are formed in the vertical direction perpendicular to the column direction ribs 16 integrally formed on the sides of each of the branch parts 5 to 8 and the flange 4, and As shown in the figure, it is continuous with the flange 4. The ribs 15 located below the array center m are perpendicular to the ribs 16 in the column direction, and are integrally formed with the flange 4 so as to extend directly downward from both sides of each of the branch parts 5 to 8.

On the other hand, the bolt holes 12 and 13 are connected to each port 5c.
Array center m so as to surround ~8c from 3 points each
They are placed above and below the The plurality of bolt holes 12 located on the upper side are arranged near the ribs 14 so as to be at approximately the same position in the row direction, and the bolt holes 13 located on the lower side are arranged at approximately the same position in the row direction. At the same time, the other bolt holes 13 between the bolt holes 13 that are close to the ribs 15 on both sides of the flange 4 are located between two adjacent ribs 15. And each of these bolt holes 1
The flange 4 is tightened and fixed to the mounting surface 1a of the engine body 1 by means of bolts 10 and 11 inserted through the bolts 2 and 13 via a gasket or the like.

According to such a configuration, the ribs 16 are stretched in the row direction between the branch parts 5 to 8, and the plurality of ribs 1 are formed in the vertical direction above and below these ribs 16.
4 and 15, the amount of elastic deformation of the flange 4 against bending in the horizontal direction or vertical direction is suppressed. And the intake pipe 2 formed in this way
The flange 4 portion is fastened to the mounting surface 1a of the engine body 1 by bolts 10 and 11 inserted into bolt holes 12 and 13 formed at the upper and lower ends of the flange 4 so as to surround each port 5c to 8c. The air passages 5a to 8a communicate with each cylinder through the air passages 5a to 8a.

Therefore, with such a configuration, each port 5c to 8c of each branch portion 5 to 8 is connected to the rib 16 in the row direction, or the vertical rib formed integrally above and below the rib 16 and on the flange 4. 14 and 15 ensure rigidity around the circumference, and most of them are inside the triangle formed by connecting the bolt hole 12 located on the upper side and the bolt hole 13 located on the lower side. It will be located in For this reason, insert the bolts 10 and 11 into each bolt hole 12 and 13,
When tightening and fixing the flange 4 to the mounting surface 1a of the engine body 1, a substantially uniform surface pressure can be obtained in the peripheral portions of each port 5c to 8c, and as a result, it is possible to maintain the flange 4 for a long period of time. Problems such as enlargement and thickening of the flange 4 portion, which would lead to high costs, can also be avoided. That is,
Each of the ribs 14 and 15 is arranged on a flange 4 adjacent to the bolt holes 12 and 13 surrounding each port 5c to 8c.
Therefore, when the bolts 10 and 11 are tightened, the high tightening force is evenly distributed around the ribs 14 and 15. Therefore, even if the flange 4 is made thin, it is possible to effectively prevent variations in surface pressure in the peripheral portions of the ports 5c to 8c.

In this embodiment, a rib 15 is formed vertically below the arrangement center m of each port 5c to 8c.
is twice the rib 14 formed on the upper side. In this way, even if the load of the intake pipe 2 or the surge tank connected above it acts on the flange 4, elastic deformation of the flange 4 due to these loads can be prevented, and the port can be maintained for a long time. 5c~8c
The surrounding surface pressure can be maintained substantially uniform.

In addition, in the above embodiment, a case was described in which ribs and bolt holes according to the present invention were formed on the flange on the side of the engine body, but it is also possible to form such ribs and bolts on the flange on the surge tank side. It is.

Further, the number of bolt holes surrounding each port is not limited to three, and various modifications can be made without departing from the spirit of the present invention.

[Effects of the invention] As detailed above, in the present invention, ribs are formed on both sides of the array center of the plurality of ports opened in the end face of the flange, and bolt holes are arranged at a plurality of points surrounding each port. This makes it possible to ensure the rigidity of the flange on both sides of the center of each port arrangement and the surface pressure of the flange surface around each port to be approximately uniform, resulting in increased weight and cost. It is possible to provide an intake pipe with excellent durability and reliability without any problems. Moreover, since the ribs are connected to the flanges in close proximity to the bolts surrounding each port, the high tightening force of the bolts can be effectively dispersed to the periphery. Therefore, a substantially uniform high surface pressure can be applied around each port, and it is possible to effectively prevent a gap from forming between the mounting surfaces over a long period of time.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention,
FIG. 1 is a plan view of the intake pipe, FIG. 2 is a partially omitted front view of the intake pipe, and FIG. 3 is a side view showing the main parts. 1...Engine body, 1a...Mounting surface, 2...
...Intake pipe, 4...Flange, 4a...End face, 5~
8... Branch part, 5a to 8a... Air passage, 5c
~8c...port, 10,11...volt, 1
2, 13... Bolt hole, 14, 15, 16... Rib.

Claims (1)

[Scope of utility model registration request] In an intake pipe in which a plurality of ports are opened on the end face of a flange, a plurality of ribs are formed continuously on the flange on both sides sandwiching the center of arrangement of each port, and bolt holes are provided at a plurality of points surrounding each port. , characterized in that at least one of the ribs is located close to each bolt hole, and the flange is tightened and fixed to the corresponding mounting surface via a bolt inserted through the bolt hole. intake pipe.