JP3177501B2 - 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.
As described in Japanese Patent Application Publication No. 65-65 and the like, it is manufactured by casting aluminum or an alloy thereof.

[0003]

However, making the inertia supercharged intake manifold made of aluminum or its alloy cast not only significantly increases the overall weight of the intake manifold but also increases the weight of each branch. The surface roughness on the inner surface of the pipe was rough, and the flow resistance of the intake air was large.

Therefore, in order to solve these problems and reduce the cost, it has been proposed to make the entire intake manifold having the above-mentioned structure made of a hard synthetic resin. In the manifold, the strength at the connecting portion of each branch pipe with respect to the common flange is low, and there is a high possibility that defects such as cracks may occur at this connecting portion.Moreover, in the conventional intake manifold made of hard synthetic resin, The common flange connecting the branch pipes is configured to be fastened to the side surface of the internal combustion engine with a plurality of bolts with a plate-shaped sealing gasket interposed therebetween. Since the entire gasket for sealing must be brought into close contact with the side of the internal combustion engine by fastening these bolts, In addition to requiring a large tightening force, it is unavoidable that creep deformation occurs in the portion between the bolts of the common flange and the sealing performance at this portion is deteriorated. There is a problem that the thickness of the common flange must be considerably large so as to reduce the creep deformation at the portion between the bolts in order to ensure the above.

An object of the present invention is to provide a structure of an inertia supercharging type intake manifold made of a hard synthetic resin 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. In the intake manifold composed of a common flange for joining to the other end and a surge tank to which the other end of each of the branch pipes is connected, the common flange, the surge tank and each of the branch pipes are made of a hard synthetic resin. And common flange
To the surge tank, one outer surface of the surge tank
While being directly connected integrally so as to extend substantially in parallel with each other, a socket pipe is integrally provided at one end of each of the branch pipes, and this socket pipe is inserted into a mounting hole formed in the common flange . Provided integrally on the outer periphery of the socket tube
Joint surface to the internal combustion engine at the flange with a common flange
While being irremovably inserted so as to abut against the side surface opposite to, a ring-shaped recess is provided on the joint surface of the common flange to the internal combustion engine so as to surround the entire circumference of the socket tube portion, A ring-shaped seal is inserted into the recess so that the seal protrudes from the joint surface of the common flange. ".

[0007]

[Operation and Effect of the Invention] Common flange, surge tank and
Each branch pipe is made of hard synthetic resin,
To the surge tank, one outside of the surge tank
Directly joined together so as to extend approximately parallel to the surface
The surge tank is joined to the internal combustion engine.
One that can be directly supported on a common flange
On the other hand, the common flange can be reinforced by a surge tank .
In the intake manifold made of a hard synthetic resin as described above, as described above, a socket pipe is integrally provided at one end of each of the branch pipes.
The socket is inserted into a mounting hole formed in the common flange.
The flange part integrally provided on the outer circumference of the pipe part
On the side opposite to the joint surface for the internal combustion engine
Since the branch pipes are inserted so that they cannot be pulled out, a part of each branch pipe is recessed into the common flange, so that the strength of the connection portion of each branch pipe to the common flange can be greatly improved. Moreover, this
At the time of connection, a flange is integrated with each branch pipe
Provided on the back of the flange common flange, that is, the common flange.
Contact the side opposite to the interface for internal combustion in the lunge
The mounting position of the common flange
Can be set, and the strength of the connection can be further improved.
You.

A ring-shaped recess is provided on the joint surface of the common flange with respect to the internal combustion engine so as to surround the entire periphery of the socket tube portion, and a ring-shaped seal is provided in the recess. When the common flange is fastened to the internal combustion engine with a plurality of bolts by inserting the body so as to protrude from the joint surface of the common flange, a ring surrounding the periphery of the socket pipe portion of each branch pipe. It is only necessary to tighten the seal member in close contact with the side surface of the internal combustion engine, and it is not necessary to tighten with a large force so that the entire seal member is in close contact like a conventional gasket.

Therefore, according to the present invention, the entire intake manifold is made of a hard synthetic resin to reduce the weight,
While reducing the intake flow resistance and reducing the price, the strength of the connection to the common flange of each branch pipe can be improved, and the occurrence of cracks and other defects at the connection can be reliably reduced. At the same time,
Positioning of the collars ensures the correct connection
Yes, and supplement the common flange with a surge tank
To be strong and to be able to reduce the tightening force
This has the effect of ensuring a predetermined sealing property without increasing the thickness of the common flange.

[0010]

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 FIG.
Shows a four-cylinder internal combustion engine in which four cylinders A1, A2, A3, and A4 are arranged in series along the axial direction 1a of the crankshaft. The intake ports 4, 5, 6, 7 to the cylinders A1, A2, A3, A4 are open.

Reference numeral 8 denotes an intake manifold for the internal combustion engine 1. The intake manifold 8 is provided with a surge tank 1 having an intake inlet pipe 9 protruding upward on 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 cylinder 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 connection 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, the connection of each of the branch pipes 11, 12, 13, 14 to the common flange 15 is made at one end of each of the branch pipes 11, 12, 13, 14 by a socket pipe portion 11a, 12a, 13a,
14a are integrally provided, and the socket tube portions 11a, 12
a, 13a, and 14a are inserted into the mounting holes 15a formed in the common flange 15 and then fixed with an adhesive or heat fusion, while joining the common flange 15 to the longitudinal side surface 3 of the cylinder head 2. On the surface 15b, a ring-shaped recess 22 is formed with each of the branch pipes 11, 12,.
Socket tube portions 11a, 12a, 13 in 13 and 14
a, and a ring-shaped seal body 23 made of a soft elastic material such as rubber is provided in the recess 22 so that the seal body 23 is provided with the common flange 15.
Is configured to protrude from the joining surface 15b by an appropriate dimension.

Each of the branch pipes 11, 12,
Connections of the connection portions 13, 14 to the connection portions 18, 19, 20, 21 on the lower surface of the surge tank 10 are made by connecting the other end portions 11 b, 12 of the branch pipes 11, 12, 13, 14.
b, 13b, and 14b with the connection portions 1 facing upward.
Mounting holes 18a, 19 drilled in 8, 19, 20, 21
a, 20a, and 21a, and then fixed by an adhesive or heat fusion.

As described above, since the surge tank 10, the branch pipes 11, 12, 13, 14 and the common flange 15 are made of hard synthetic resin, the entire intake manifold 8 can be significantly reduced in weight. Since the inner surfaces of the branch pipes 11, 12, 13, and 14 become smooth, the flow resistance of the intake air can be significantly reduced. In this case, as described above, each branch 11, 12, 1
At one end of each of the socket tubes 11a, 12a, 13
a, 14a are integrally provided, and the socket tube portions 11a,
After the 12a, 13a, and 14a are inserted into the mounting holes 15a formed in the common flange 15, they are fixed by an adhesive or heat fusion, so that each of the branch pipes 11, 12, 13,. 14 is a common flange 1
5, the strength at the connecting portion of each branch pipe 11, 12, 13, 14 with respect to the common flange 15 can be greatly improved, and the occurrence of defects such as cracks at the connecting portion can be prevented. It can be reduced reliably.

In this case, each of the branch pipes 11,
One end of each of 12, 13, 14 has a flange 11c, 12c, 13
c, 14c are provided integrally, and the flange portions 11c, 12c are provided.
c, 13c, 14c on the back of the common flange 15 ,
The joint surface 15 for internal combustion at the common flange 15
The configuration that makes contact with the side surface opposite to the side b allows the mounting position of the common flange 15 to be set accurately, and has the advantage that the strength of the connection portion can be further improved.

As described above, the common flange 15
In the joint surface 15b of the cylinder head 2 with respect to the longitudinal side surface 3, a ring-shaped recess 22 is formed in the socket pipe portion 11 of each of the branch pipes 11, 12, 13, and 14.
a, 12a, 13a, and 14a are provided so as to surround the periphery thereof, and a seal body 23 formed of a soft elastic body such as rubber and formed in a ring shape in the recess 22 is provided. When the common flange 15 is fastened to the longitudinal side surface 3 of the cylinder head 2 of the internal combustion engine 1 with a plurality of bolts 16, each of It is only necessary to lightly tighten the ring-shaped seal body 23 surrounding the periphery of the socket pipe portions 11a, 12a, 13a, 14a of the branch pipes 11, 12, 13, 14 so as to be in close contact with the longitudinal side surface 3, in other words, By simply tightening the common flange 15 lightly, a predetermined sealing property can be ensured.

Further, as in the above-described embodiment, the common flange 15 and the surge tank 10 are disposed at positions adjacent to each other, and both of them are connected to the common flange 1.
5, the surge tank 10 is connected directly to the cylinder head 2 of the internal combustion engine by directly connecting the surge tank 10 to the cylinder head 2 of the internal combustion engine. Fifteen
, While the common flange 15 can be reinforced by the surge tank 10.

In particular, each of the branch pipes 11, 12,
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 through the upper side of the surge tank 10, and then bend downwardly outside the surge tank 10, and further curve downward. The surge tank 10 is bent upward at the lower side of the tank 10.
The surge tank 10 is connected to each of the connecting portions 18, 19, 20, and 21 on the lower surface of the cylinder head 1, and the surge tank 10 is located at a position close to the longitudinal side surface 3 of the cylinder head 2. , A2, A3, and A4 each have a long branch pipe 11, 12, 13, and 14,
Since it can be arranged so as to substantially surround the outside of the surge tank 10, both the height H of the entire intake manifold 8 and the protrusion L from the longitudinal side surface 3 to the outside surface of the cylinder head 2 are: It is possible to reliably prevent the branch pipes 11, 12, 13, and 14 from simultaneously increasing due to lengthening.

[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;

FIG. 5 is an enlarged sectional view showing a connection portion of the branch pipe to a common flange.

FIG. 6 is a view showing the disassembled state of FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Internal combustion engine A1, A2, A3, A4 Cylinder 2 Cylinder head 3 Longitudinal side 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 11a, 12a, 13a, 14a Branch pipe socket section 15 Common flange 15a Mounting hole 16 Bolt 17 Throttle body 22 Ring-shaped recess 23 Seal body

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Yoshihiro Kimoto 2-1-1, Taoyuan, Ikeda-shi, Osaka Dai-Hatsu Industry Co., Ltd. (72) Mikio Nakajima 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Co., Ltd. (72) Inventor: Toshiki Miyaji, 175, Oazahara, Hachihonmatsu-cho, Higashihiroshima-shi, Hiroshima Co., Ltd. (56) References JP-A-7-148864 (JP, A) JP-A-6-341355 (JP, A) JP-A-9-250408 (JP, A) JP-A-6-8756 (JP, U)

Claims (1)

(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, In the intake manifold comprising a surge tank to which an end is connected, the common flange, the surge tank and the branch pipes are made of a hard synthetic resin, and the common flange is
With the outer surface of one of the surge tanks
While being directly connected integrally so as to extend in a row, a socket pipe portion is integrally provided at one end of each of the branch pipes,
A flange portion integrally provided on an outer periphery of the socket tube portion in a mounting hole formed in the common flange.
Is opposite to the interface for the internal combustion engine at the common flange
And a ring-shaped recess is provided on the joint surface of the common flange to the internal combustion engine so as to surround the entire periphery of the socket tube portion. A structure of an inertia supercharged intake manifold in a multi-cylinder internal combustion engine, wherein a ring-shaped seal is inserted in a place such that the seal protrudes from a joint surface of a common flange.