JP3177499B2 - Structure of Inertial Supercharged Intake Manifold for Multi-Cylinder Internal Combustion Engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-cylinder internal combustion engine such as a four-cylinder internal combustion engine and the like, in which intake manifold for distributing intake air from an air cleaner to each cylinder is designed to be supercharged by an inertial effect. The present invention relates to the structure of the intake manifold.

[0002]

2. Description of the Related Art Generally, an inertia supercharging type intake manifold of this type has a relatively long branch pipe independent for each cylinder, and a common flange for joining one end of each branch pipe to an internal combustion engine. And a surge tank connected to the other end of each of the branch pipes and provided with an inlet for intake air.
No. 65, etc., the surge tank is separated from a common flange to be attached to an internal combustion engine, and the interval is connected by a plurality of branch pipes to cast aluminum or an alloy thereof. Produced at

[0003]

In the intake manifold of this configuration, a throttle body or a carburetor having a considerable weight is attached to the surge tank. In the case of disposing the surge tank at a distance from the common flange, the surge tank is
Since it must be configured to be integrally connected via a stay member or to be supported via a separate stay member, the entire intake manifold is enlarged by the distance that the surge tank is separated from the common flange. In addition to the necessity of the above-mentioned stay member, the thickness of the common flange is increased or an appropriate rib is integrally provided to improve the sealing performance when joining the common flange to the internal combustion engine. Since it is necessary to ensure the weight, the weight increases, and in particular, when the support is performed via a separate stay member, there is a problem that the number of parts and the number of assembling steps are increased. .

Conventionally, the entire intake manifold having the common flange, the surge tank, and the respective branch pipes connecting them is manufactured by casting aluminum or an alloy thereof. There is also a problem that the surface roughness on the inner surface is rough and the flow resistance of the intake air is large.

An object of the present invention is to provide a structure of an inertia supercharging type intake manifold which solves these problems.

[0006]

In order to achieve the technical object, the present invention provides a multi-cylinder internal combustion engine having a relatively long branch pipe independent for each cylinder, and one end of each branch pipe connected to the internal combustion engine. And a surge tank to which the other end of each of the branch pipes is connected, wherein the common flange , the surge tank, and the surge tank are connected to each other.
Each branch pipe connecting them is made of hard synthetic resin
On the other hand, the common flange and the surge tank are
Proximity to each other, a common flange
Integrated so that it extends substantially parallel to one outer surface of the link
Direct connection. ".

[0007]

As described above, the common flange and the front
Surge tanks and each brand connecting between them
In addition to reducing the weight of the entire intake manifold by making the hard pipe made of hard synthetic resin, the inner surface of each branch pipe is smoothed, so the flow resistance of the intake manifold is made by casting the intake manifold. It can be significantly reduced as compared with the above.

In addition, the common flange and the surge tank are mutually connected.
Close to each other, a common flange
Integrated so that it extends approximately parallel to one outer surface of the
By directly molding the surge tank, the surge tank can be directly supported by the common flange joined to the internal combustion engine, while the common flange can be reinforced by the surge tank.

[0009] Therefore, according to the present invention , the absorption is more improved than before.
The air flow resistance can be reduced , and the size of the entire intake manifold can be reduced. Further , unlike the related art, the provision of a stay member for supporting the surge tank on the common flange is omitted. In addition to the fact that the common flange can be reinforced by the surge tank, the common flange can be reduced in weight by that much, so that the entire intake manifold can be considerably reduced in weight compared to the conventional case.

Still further, according to a second aspect of the present invention, each of the branch pipes extends laterally from the common flange through the upper side of the surge tank as viewed from the axial direction of the crankshaft of the internal combustion engine, and then extends. Each branch that must be lengthened in order to achieve inertial supercharging by curving downward outside the surge tank and further curving upward below the surge tank and connected to the lower surface of the surge tank Since the pipe can be disposed so as to substantially surround the surge tank, both the height dimension of the entire intake manifold and the projection dimension from the internal combustion engine increase the length of each branch pipe. Therefore, it is possible to reliably avoid the simultaneous increase due to the above, and it is possible to reduce the size of the intake manifold.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings in the case of an intake manifold for an internal combustion engine having four cylinders.

In this figure, reference numeral 1 denotes four cylinders A
1, A2, A3, A4 are arranged in series along the axial direction 1a of the crankshaft. A four-cylinder internal combustion engine is shown. Intake ports 4,5 to A3, A4
6, 7 are open.

Reference numeral 8 denotes an intake manifold for the internal combustion engine 1. This intake manifold 8 has a surge tank 1 having an intake inlet pipe 9 protruding upward from the upper surface.
0 and four long branch pipes 11, 12, 1
3, 14 and the branch pipes 11, 12, 13,
A common flange 15 joining one end of the cylinder head 14 to the longitudinal side surface 3 of the cylinder head 2 of the internal combustion engine 1;
These surge tank 10, each branch pipe 11, 1
2, 13, 14 and the common flange 15 are all made of thermoplastic hard synthetic resin such as polyamide resin (nylon).

Then, the common flange 15 and the surge tank 10 are disposed at positions adjacent to each other, and the two are arranged such that the common flange 15 extends substantially parallel to one outer surface of the surge tank 10. The common flange 15 is integrally and directly connected to the cylinder head 2.
, Each branch pipe 11,
12, 13, and 14 are assigned to the cylinders A1, A2, A3, and A4, respectively.
Are joined by fastening with a plurality of bolts 16 so as to communicate with the intake ports 4, 5, 6, 7.

Further, as shown in FIG. 1 which is a plan view, a surge tank 10 in the intake manifold 8 is provided with a second one located at the center among the cylinders A1, A2, A3 and A4.
A throttle body 17 provided with a throttle valve (not shown) is provided at a position between the cylinder A2 and the third cylinder A3, and at the upper end of the intake inlet pipe 9 on the upper surface of the surge tank 10.

Further, on the lower surface of the surge tank 10, four connecting portions 18, 19, 20, 21 for the respective branch pipes 11, 12, 13, 14 are provided, while the respective branch pipes 11, 12,. 13, 14
Aligned to the same length, the direction of the axis of the crankshaft 1a
As shown in FIG. 2 which is a side view seen from the side, the lateral direction extends from the common flange 15 attached to the longitudinal side surface 3 of the cylinder head 2 through the upper side of the surge tank 10 and then downwards outside the surge tank 10. , And further upward at the lower side of the surge tank 10, so that each connection portion 18, 19, 20,
21.

In this case, each branch pipe 11, 12, 13, 14 is connected to the common flange 15 by inserting one end of each branch pipe 11, 12, 13, 14 into the common flange 15. Later
Each of the branch pipes 11, 12, 13, and 14 has a connection portion 18, 1 on the lower surface of the surge tank 10 which is fixed by an adhesive or heat fusion.
Connections to 9, 20, 21 are made in each branch pipe 1
1, 12, 13, and 14 are connected to the connecting portions 18 and 1 respectively.
After being inserted into 9, 20, and 21, it is configured to be fixed by an adhesive or heat fusion.

As described above, the common flange 15 and the surge tank 10 are disposed at positions adjacent to each other, and the common flange 15 and the surge tank 10 are connected to each other by the common flange 15.
To extend substantially parallel to one outer surface of the
The common flange 15 is connected directly to the longitudinal side surface 3 of the cylinder head 2 by connecting the branch pipes 11, 12, 13, 14 to the cylinders A1, A2, A.
The surge tank 10 is joined to the cylinder head 2 of the internal combustion engine by joining with a plurality of bolts 16 so as to communicate with the intake ports 4, 5, 6, 7 to 3, A4. The common flange 15 can be directly supported on the common flange 15, while the common flange 15 can be reinforced by the surge tank 10.

Further, since the surge tank 10, the branch pipes 11, 12, 13, and 14 and the common flange 15 are made of a hard synthetic resin, the intake manifold 8 is provided.
In addition to being able to reduce the weight of the whole, the inner surfaces of the branch pipes 11, 12, 13, and 14 become smoother.
The flow resistance of intake air can be greatly reduced.

Furthermore, each of the branch pipes 11, 1
2, 13 and 14 extend laterally from the common flange 15 attached to the longitudinal side surface 3 of the cylinder head 2 in a side view, passing above the surge tank 10 and then bend downward outside the surge tank 10 to be further bent. The surge tank 10 is bent upward at the lower side of the surge tank 10 and connected to each of the connection portions 18, 19, 20, and 21 on the lower surface of the surge tank 10, so that the surge tank 10 is
Each branch pipe 11, 12, 13, 14 having a long length with respect to each cylinder A1, A2, A3, A4 under a state of being located at a position close to the longitudinal side surface 3 of the cylinder head 2.
Can be disposed so as to substantially surround the outside of the surge tank 10, the height H of the entire intake manifold 8 and the longitudinal side surface 3 of the cylinder head 2
It can be reliably prevented that both of the protrusion dimensions L from the outer surface to the outer surface increase at the same time due to the lengthening of the branch pipes 11, 12, 13, and 14.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a side view taken along the line II-II of FIG.

FIG. 3 is an enlarged sectional view taken along line III-III of FIG. 1;

FIG. 4 is an enlarged sectional view taken along IV-IV of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Internal combustion engine A1, A2, A3, A4 Cylinder 2 Cylinder head 3 Longitudinal side surface of cylinder head 4, 5, 6, 7 Intake port 8 Intake manifold 9 Intake inlet pipe 10 Surge tank 11, 12, 13, 14 Branch pipe 15 Common Flange 16 Bolt 17 Throttle body 18, 19, 20, 21 Connection

Continuation of the front page (72) Inventor Mikio Nakajima 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (56) References JP-A-3-54317 (JP, A) JP-A-7-17954 (JP, U) WO 98/22705 (WO, A1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F02M 35/10

Claims (2)

(57) [Claims] 1. A relatively long branch pipe independent for each cylinder in a multi-cylinder internal combustion engine, a common flange for joining one end of each branch pipe to the internal combustion engine, An intake manifold comprising a surge tank to which an end is connected, wherein the common flange, the surge tank,
The branch pipes connecting the
On the other hand, the common flange and the surge tank
Close to the two, the common flange is the surge tank
To extend substantially parallel to one outer surface of the
A structure of an inertia supercharged intake manifold in a multi-cylinder internal combustion engine characterized by being directly coupled . 2. The branch pipe of an internal combustion engine is connected to each of the branch pipes.
When viewed from the axial direction of the link shaft, the common flange
After extending sideways through the upper side of the surge tank,
Curves downward on the outside of the surge tank and
Bends upwards under the ink tank and under the surge tank.
2. The structure of an inertia supercharged intake manifold in a multi-cylinder internal combustion engine according to claim 1, wherein the intake manifold is connected to a surface .