JP2000073892A - Connection method of branch pipe in inertial supercharging intake manifold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify connection of one end of a branch pipe to a common flange by heat deposition and improve connection strength with respect to an intertial supercharging intake manifold made of a hard synthetic resin, composed of the comparatively long branch pipe independently formed in each cylinder of a multicylinder internal combustion engine, a common flange connecting ends of one sides of the branch pipes to the internal combustion engine, and the surge tank to which the remaining ends of the branch pipes are connected. SOLUTION: A socket tubular part 22 and a flange 23 are integrated with one end of each branch pipe. The socket tubular part is inserted into an attaching hole 15a of a common flange such that a heating wire 24 formed so as to surround an outer side of the socket tubular part is located on a corner between the socket tubular part and the flange 23. current is carried to the heating wire 24, in the state that the flange 23 is pressurized against an outer surface 15b of the common flange.

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 a method of joining each branch pipe in the intake manifold in the intake manifold described above.

[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]

Making such an 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 pipe. The surface roughness on the inner surface 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, after forming each branch pipe with a mold different from the surge tank and the common flange, this is joined to the surge tank and the common flange with an adhesive, or It is configured to join by heat fusion by butting.

[0005] However, the former method of bonding with an adhesive requires a considerable amount of time and trouble to apply the adhesive, and also requires a long time until the adhesive hardens.
Not only does the cost required for joining significantly increase, but also the joint strength is low.In addition, the latter method of joining by heat fusion by butting can shorten the time required for joining, but each branch pipe The swelling during heat fusion occurs on the inner surface of the joint, which not only increases the flow resistance of the intake air, but also requires a special technique for heat fusion, and because it is heat fusion by butt, the joining of There was a problem that the strength was low.

According to the present invention, when the intake manifold is made of a thermoplastic hard synthetic resin, each branch pipe is heat-sealed to a surge tank or a common flange without causing the above-mentioned problem. Very easily
Further, it is an object of the present invention to provide a method that can be strengthened.

[0007]

In order to achieve this technical object, a joining method according to the present invention comprises a method of connecting one end of each branch pipe in an intake manifold made of a thermoplastic hard synthetic resin to an internal combustion engine of the intake manifold. In heat-sealing the connection common flange or the surge tank, at one end of each branch pipe, a socket pipe inserted into a mounting hole formed in the common flange or the surge tank, and the common flange or the surge tank. A flange portion abutting on the outer surface of the tank was integrally provided, and then the socket tube portion was formed in the mounting hole of the common flange or surge tank so as to surround the outside of the socket tube portion. Insert so that the heating wire is located at the corner between the socket tube and the flange, and then the flange contacts the common flange or the outer surface of the surge tank While pressing such, characterized by energizing the heating wire. "Is intended.

[0008]

As described above, by applying a current to the heating wire, portions of the branch pipes and the common flange or the surge tank that come into contact with the heating wire are melted and fused together. Therefore, each branch pipe can be heat-sealed to the common flange or the surge tank very easily.

Further, by inserting the socket pipe portion integrally provided at one end of each of the branch pipes into the common flange or the mounting hole on the surge tank side, a part of each branch pipe becomes common flange or Since it is recessed into the inside of the surge tank, the joint strength of the branch pipes to the common flange or the surge tank can be improved so as not to be compared with the case of butt joint.

[0010] In addition, since the above-mentioned heat fusion by energizing the heating wire is performed outside the socket tube portion, it is ensured that a part of the molten resin flows into each branch pipe. You can stop it. Therefore, according to the present invention, in the intake manifold made of thermoplastic hard synthetic resin, joining each branch pipe by heat fusion to a common flange or surge tank is performed by increasing the swelling on the inner surface of each branch pipe. This can be performed extremely easily without causing any increase in the flow resistance of the intake air, and also has the effect of greatly improving the joining strength.

[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 FIG.
Indicates 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 projecting 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 connected to the branch pipes 11 and 1 with respect to the longitudinal side surface 3 of the cylinder head 2.
The two, 13, and 14 are joined by a plurality of bolts 16 so as to communicate with the intake ports 4, 5, 6, and 7 to the cylinders A1, A2, A3, and A4.

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 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, and 14 to the common flange 15 is performed by heat fusion in a method shown in FIGS. That is, each of the branch pipes 11,
At one end of each of 12, 13, and 14, a socket tube portion 22 inserted into a mounting hole 15a formed in the common flange 15 is provided.
And a flange portion 2 abutting on the outer side surface 15b of the common flange 15.
And 3 are provided integrally.

Next, the socket tube portion 22 is inserted into the mounting hole 15a in the common flange 15. At the time of insertion, the heating wire 24 bent so as to surround the outside of the socket tube portion 22 is connected to the socket tube portion 2.
So that it is located at the corner between 2 and the collar.

Next, the flange 23 is connected to the common flange 15.
When the heating wire 24 is energized in a state where it is pressed against the outer side surface 15b, each branch pipe 1
1, 12, 13, 14, a portion of the common flange 15 that contacts the heating wire 24, a corner between the socket pipe portion 22 and the flange in each branch pipe, and an inner surface and an outer surface of the mounting hole 15 a in the common flange 15. Since the corner portions of the branch pipes 15b and 15b are simultaneously melted and fused together, the branch pipes 11, 12, 13, 14
To the common flange 15 extremely easily.

In addition, each of the branch pipes 11, 1
By inserting the socket tube portion 22 integrally provided at one end of each of the 2, 13, and 14 into the mounting hole 15a in the common flange 15, a part of each branch pipe is sunk into the common flange 15. Because of the form, the joining strength of each of the branch pipes 11, 12, 13, and 14 to the common flange 15 can be improved so as not to be compared with the case of butt joining.

Further, the heat fusion by energizing the heating wire 24 is performed outside the socket tube portion 22 so that a part of the melted resin is removed from each branch pipe 1.
Since it can be reliably prevented from flowing into the insides of the branch pipes 1, 12, 13, and 14, it is possible to prevent the formation of a raised portion of the molten resin on the inner surface of each of the branch pipes 11, 12, 13, and 14 during the heat fusion. It can be avoided without fail.

A ring-shaped recess 25 is provided on the joint surface of the common flange 15 with respect to the longitudinal side surface 3 of the cylinder head 2 so as to surround the socket tube portion 22. A ring-shaped gasket 26 for sealing the longitudinal side surface 3 of the cylinder head 2 is mounted in the cylinder head 25. Note that the above-described embodiment is applicable to each of the branch pipes 11, 12, 13, and 14.
Is bonded to the common flange 15 by heat fusion. However, the present invention is not limited to this, and the branch pipes 11, 12, 13, and 14 are thermally fused to the surge tank 10. It is needless to say that the present invention can be applied to the case of joining at the same time.

[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 the line IV-IV in FIG. 1;

FIG. 5 is an enlarged sectional view showing a state where a branch pipe is joined to a common flange.

FIG. 6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is an enlarged sectional view showing a state in which a branch pipe is inserted into a common flange.

FIG. 8 is an enlarged sectional view showing a state in which the branch pipe is joined to a common flange.

[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 15a Mounting hole in common flange 15b Outer surface of common flange 22 Socket tube section 23 Flange section 24 Heating wire

Continuing from the front page (72) Yoshihiro Kimoto 2-1-1, Taoyuan, Ikeda-shi, Osaka Daihatsu Industry Co., Ltd. (72) Takeharu Suga 175, Ojihara, Hachihonmatsu-cho, Higashihiroshima-shi, Hiroshima F term in Kyo Co., Ltd. (reference) 3H019 BA41 DA01 DA07 4F211 AA25 AA29 AD05 AD12 AG08 AH17 AK09 TA01 TC08 TC11 TD02 TD07 TN31

Claims (1)

[Claims] 2. The method according to claim 1, wherein one end of each branch pipe in the intake manifold made of a thermoplastic hard synthetic resin is heat-sealed to a common flange or a surge tank for connecting the intake manifold to an internal combustion engine. At one end of the common flange or surge tank, a socket pipe portion inserted into a mounting hole formed in the surge tank, and a common flange or a flange portion abutting against the outer surface of the surge tank are integrally provided, This socket pipe part, in the mounting hole of the common flange or surge tank,
The heating wire formed so as to surround the outside of the socket tube is inserted so as to be located at the corner between the socket tube and the flange, and then the flange contacts the common flange or the outer surface of the surge tank. The method of joining branch pipes in an inertia supercharged intake manifold, characterized in that the heating wire is energized in such a pressed state.