JPH04124454A - Intake structure for engine - Google Patents

Abstract

PURPOSE:To prevent a manifold flange and a tank flange from being enlarged by forming a specified fitting space between adjacent intake branch passage wall parts in order to fit fixtures from the intake manifold side for the fixing of a surge tank. CONSTITUTION:The tank flange 20 of a surge tank 6 is jointed to the manifold flange 16 of an intake manifold 4 provided with plural intake branch passage wall parts 12-1-12-4 so as to fix the surge tank 6 to the intake manifold 4 by tank fitting bolts. In this case, specified fitting spaces are formed between the respectively adjacent intake branch passage wall parts 12-1-12-4 in order to fix the surge tank 6 by fitting the bolts from the intake manifold 4 side. Accordingly, there is no need to enlarge the manifold flange 16 and the tank flange 20 for the bolts, and this results in reducing the weight and also contributing to space saving.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to the intake structure of an engine, and in particular, by making it possible to attach a fitting from the intake manifold side when fixing a surge tank to the intake manifold. , relates to an engine air intake structure that can reduce weight by preventing enlargement of manifold flanges and tank flanges, and can contribute to space saving.

[Prior Art] In the intake system of an engine, a surge tank is provided in order to prevent the occurrence of surging and the like.

This surge tank may be provided integrally with the intake manifold, or may be formed separately from the intake manifold and fixed to the intake manifold.

When the surge tank is constructed separately from the intake manifold, as shown in Fig. 5.6, the manifold flange 106 of the intake manifold 104 attached to the engine 102 and the tank flange 110 of the surge tank 108 are joined, and a mounting A plurality of first to fifth tank mounting bolts 112-
1 to 112-5, the surge tank 108 is fixed to the intake manifold 104.

The intake manifold 104 has, for example, four first to fourth intake branch wall portions 104-1 to 104-4.

In this case, if you try to install the tank mounting bolt 112 from the intake v-nifold 104 side, the first to fourth intake branch passage walls 104-1 to 104-4 will get in the way, and depending on the location, you may be able to install it from the bottom in FIG. Since the tank mounting bolt 112 could not be installed, the tank mounting bolt 112 was installed from above on the surge tank 108 side (see FIG. 5).

[Problem to be solved by the invention] However, in FIG. 5, the tank mounting bolt 112
If the tank is installed from above, the manifold flange 106 and tank flange 110 must protrude outward beyond the outer surface 108f of the surge tank 108 due to the presence of the tank mounting bolts 112. This leads to an increase in the number of people, and a large amount of space is required.
Further, there are disadvantages in that installation workability is reduced and it becomes difficult to ensure sealing performance.

[Object of the Invention] Therefore, the object of the invention is to eliminate the above-mentioned disadvantages.
The size of the manifold flange and tank flange can be reduced by attaching the surge tank mounting tool from the intake manifold side and creating a predetermined mounting interval between adjacent intake branch passage walls in order to securely install the surge tank to the intake manifold. The object of the present invention is to realize an engine intake structure that prevents the formation of air bubbles, reduces weight, and contributes to space saving.

[Means for Solving the Problems] In order to achieve this object, the present invention connects a tank flange of a surge tank to a manifold flange of an intake manifold having a plurality of intake branch wall portions, so that In an engine intake structure in which a surge tank is fixed by a fitting, a predetermined space is provided between adjacent intake branch passage wall portions in order to attach the fitting from the intake manifold side and fix the surge tank to the intake manifold. It is characterized by forming a mounting interval of .

[Function] According to the configuration of the present invention, when the surge tank mounting tool is attached to the manifold flange and the tank flange from the mounting interval between the adjacent intake branch passage walls, the surge tank is fixed to the intake manifold. . This eliminates the need to increase the size of the manifold flange and tank flange due to the attachment (which reduces weight and contributes to space saving).

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail and specifically based on the drawings.

1 to 3 show embodiments of this invention. In the figure, 2 is the vehicle engine, 4 is the intake manifold,
6 is a surge tank, and 8 is a throttle body. The intake manifold 4 includes, for example, four first to fourth intake branch paths 1.
1st to 4th intake branch wall portions 1 forming 0-1 to 10-4
2-1 to 12-4. These first to fourth intake branch wall portions 12-1 to 12-4 are bent into an L shape when viewed from the side.

The first to fourth intake branch wall portions 12-1 to 12-4 are provided with an engine-side flange 14 on one end side and a manifold flange 16 on the other end side.

The engine side flange 14 has an engine side gasket 18
It is attached to the engine 2 via.

The surge tank 6 is formed separately from the intake manifold 4 to prevent the occurrence of surging and the like.

This surge tank 6 is provided with a tank flange 2o of a size that matches the manifold flange 16.

This tank flange 20 is fixed to the manifold flange 16 via a tank side gasket 22.

The throttle body 8 has a body side mounting portion 24 connected to the surge tank 6 via a throttle body side gasket 26.
It is attached to the surge tank 6 by being fixed to the tank side attachment part 28 of the surge tank 6.

At the outer edge portion of the engine side flange 14, a 1.3
As shown in the figure, attaching bolts to engine 2 (not shown)
A plurality of first to eleventh engine side mounting holes 30-1 through which the
~30-11 are formed.

Further, as shown in FIG. 2.3, the outer edge portion of the manifold flange 16 has first to third tank mounting bolts 32, which are fittings for fixing the surge tank 6, inserted therein.
Eight manifold side mounting holes 34-1 to 34-8 are formed.

Further, at the outer edge of the tank flange 20, as shown in FIG. 2, the manifold side mounting holes 34-1 to 34-
The 1st to 8th tank side mounting holes 36-1 to 8 correspond to the locations corresponding to
36-8 is formed.

The tank attachment bolts 32 are attached to these first to eighth tank-side attachment holes 36-1 to 36-8, respectively.

In this embodiment, for example, the first intake branch wall 12-1 and the second intake branch wall 12-1 are connected at a portion on the manifold flange 16 side so that the tank mounting bolt 32 can be attached from the intake manifold 4 side. Branch road wall 12-
2 and the third intake branch passage wall portion 12-3.
and the fourth intake branch wall 12-4 are brought close together to form a predetermined mounting distance between the second intake branch wall 12-2 and the third intake branch wall 12-3. Thereby, the tank mounting bolt 32 can be mounted from the intake manifold 4 side.

In this way, by being able to attach the tank mounting bolts 32 from the intake manifold 4 side, the manifold flange 16 and tank flange 20 can be attached to the surge tank 6.
This configuration eliminates the need for large projections outward from the outer surface of the holder.

Next, the operation of this embodiment will be explained.

When attaching the surge tank 6 to the intake manifold 4 attached to the engine 2, connect the tank flange 20 to the manifold flange 16, and attach each tank mounting bolt from the intake manifold 4 side, that is, from the bottom of Fig. 1.3. 32 is inserted into each manifold side attachment hole 34, and this tank attachment bolt 32 is attached to each tank side attachment hole 36.

At this time, since a mounting gap is formed between the second intake branch wall 12-2 and the third intake branch wall 12-3, the tank is also mounted in the fifth manifold side mounting hole 34-5. The tank mounting bolts 32 can be easily inserted through all of the first to eighth manifold side mounting holes 34-1 to 34-8, and the surge tank 6 can be mounted. I can do it.

As a result, the surge tank 6 can be installed from the intake manifold 4 side, that is, from the bottom of FIGS. There is no need to protrude outward from the outer surface, which reduces weight and contributes to space saving.

Further, sometimes the surge tank 6 can be easily installed from below, improving work efficiency and also easily ensuring sealing between the manifold flange 16 and the tank flange 20.

FIG. 4 shows a modification of the invention.

That is, the second intake branch wall portion 12-2 of the intake manifold 4
and the third intake branch wall 12-3 to form a first attachment interval L1 between the first intake branch wall 12-1 and the second intake branch wall 12-2, An attachment interval L2 is formed between the third intake branch wall 12-3 and the fourth intake branch wall 12-4.

According to the configuration of this modification, in particular, the first intake branch wall portion 1
2-1 and the second intake branch wall 12-2, and the fourth manifold side mounting hole 34-4 between the third intake branch wall 12-3 and the fourth intake branch wall 12-4. The tank mounting bolts 32 can be easily inserted into the manifold side mounting holes 34-7 from below, and the same effect as the above embodiment can be obtained, and the number of tank mounting bolts 32 can be increased to accommodate the surge tank 6. Installation can make the situation firmly maintained.

[Effects of the Invention] As is clear from the detailed explanation above, according to the present invention,
By attaching the surge tank fittings from the intake manifold side and creating a predetermined mounting interval between adjacent intake branch walls to secure the surge tank to the intake manifold, the size of the manifold flange and tank flange can be reduced. This prevents the structure from forming, reduces weight, and contributes to space saving.

[Brief explanation of the drawing]

1 to 3 show embodiments of the present invention, FIG. 1 is a front view of an intake manifold with a surge tank fixed thereto, and FIG. 2 is a front view of an intake manifold with a surge tank fixedly attached as shown by arrow H in FIG. The bottom view and FIG. 3 are assembly diagrams of the engine intake structure. FIG. 4 shows a modification of the invention, and is a bottom view of the intake manifold. Figure 5.6 shows the conventional intake structure, Figure 5 is a side view of the intake manifold with a surge tank fixedly installed, and Figure 6 shows the intake manifold.
It is a top view in a figure. In the figure, 2 is the engine, 4 is the intake manifold, 6 is the surge tank, 10 is the intake branch passage, 12 is the intake branch passage wall, 16 is the manifold flange, 20 is the tank flange, and 32 is the tank mounting bolt. be. Figure 4 Figure 5 Figure 5

Claims (1)

[Claims] 1. In an engine intake structure in which a tank flange of a surge tank is joined to a manifold flange of an intake manifold having a plurality of intake branch wall portions, and the surge tank is fixed to the intake manifold with a fitting, the fitting is attached. An intake structure for an engine, characterized in that a predetermined mounting interval is formed between adjacent intake branch passage wall portions so that the surge tank can be fixed to the intake manifold by being attached from the intake manifold side.