JPH06280700A - Manufacture of intake manifold - Google Patents

Abstract

PURPOSE:To reduce the man-hours for manufacture by setting a parison in a metal mold blow molding and blowing air into the parison to mold a branch pipe while connecting both ends of the parison to the inner peripheral surface of holes in a mounting part. CONSTITUTION:A tubular parison opened in both ends is extrusion molded for example. One and of the parison is inserted in hole 5b in an expanded pipe part 5a of a tubular part 5 for connecting a branch pipe of a plenum chamber 1 and the other end is inserted in a hole 11b in an expanded pipe 11a of a tubular part 11 for connecting a branch pipe of a cylinder heat mounting flange 9. Next, the plenum chamber 1, cylinder head mounting flange 9 and parison are set in a metal mold for blow molding. Then, the branch pipe 6 is molded by blowing air into the parison to expanded the parison, while the outer peripheral surface of both ends of the branch pipe is connected with the inner peripheral surface of the holes 5b, 11b. Thus, an intake manifold is manufactured with less manhours and simplified productive operations.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an intake manifold used for an automobile engine, for example.

In this specification, the term "aluminum" includes aluminum alloy in addition to pure aluminum.

[0003]

2. Description of the Related Art As an intake manifold used in, for example, an automobile equipped with an electronically controlled fuel injection device, an aluminum plenum chamber, an aluminum cylinder head mounting flange, and one end thereof are inserted into holes formed in the plenum chamber. It is known that the branch pipe is made of aluminum and is connected to the cylinder head mounting flange while being connected to the plenum chamber with the other end inserted into the hole formed in the cylinder head mounting flange. It was

However, in such an intake manifold, it is necessary to braze the plenum chamber and the cylinder head mounting flange to the branch pipe, and it is necessary to bend the branch pipe into a predetermined shape, which makes the manufacturing work troublesome. There was a problem. Moreover, the intake manifold has a problem that the weight becomes large.

Therefore, in order to solve such a problem, the present applicant has previously proposed that an aluminum plenum chamber, an aluminum cylinder head mounting flange, and
Each end is connected to the plenum chamber while being inserted into the hole formed in the plenum chamber, and each end is connected to the cylinder head mounting flange while being inserted into the hole formed in the cylinder head mounting flange. In addition, there is proposed an intake manifold which is made of a plastic branch pipe and has both ends of the branch pipe inserted into the holes of the plenum chamber and the cylinder head mounting flange and bonded by an adhesive (see Japanese Patent Laid-Open No. 5-10220).

[0006]

However, Japanese Unexamined Patent Publication No.
It was found that the intake manifold described in Japanese Patent No. 10220 also has the following problems. That is, in manufacturing this intake manifold, a plastic branch pipe of a predetermined shape is molded by an appropriate method, and then both ends thereof are inserted into the holes of the plenum chamber and the cylinder head mounting flange and bonded with an adhesive. It is necessary, and the number of man-hours increases, and the work is troublesome.

An object of the present invention is to provide a method for manufacturing an intake manifold that solves the above problems.

[0008]

SUMMARY OF THE INVENTION A method of manufacturing an intake manifold according to the present invention comprises a plenum chamber made of aluminum, a cylinder head mounting flange made of aluminum, and a plenum with one end inserted into a hole formed in the plenum chamber. A method of manufacturing an intake manifold comprising a plastic branch pipe connected to a cylinder head mounting flange while being connected to a chamber and having the other end inserted into a hole formed in the cylinder head mounting flange. After inserting one end of the cylindrical parison with both ends open into the hole of the plenum chamber and the other end into the hole of the cylinder head mounting flange, set the plenum chamber, the cylinder head mounting flange and the parison in the blow mold. Then, blow air into the parison and make a pariso. Thereby forming a branch pipe by inflating, and is characterized in that bonding the both ends on the inner peripheral surface of the plenum chamber and the cylinder head mounting flange holes.

[0009]

[Function] After inserting one end of the cylindrical parison with both ends opened into the hole of the plenum chamber and the other end into the hole of the cylinder head mounting flange, the plenum chamber, the cylinder head mounting flange and the parison are placed in the blow molding die. The branch pipe is formed by blowing air into the parison to expand the parison, and both ends of the branch pipe are joined to the inner peripheral surfaces of the holes of the plenum chamber and the cylinder head mounting flange. The shaping of the shaped branch pipe and the joining of the branch pipe to the plenum chamber and the cylinder head mounting flange can be performed simultaneously.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the entire intake manifold manufactured according to the present invention, and FIG. 2 shows the essential parts thereof.

In FIG. 1, an intake manifold is made of an aluminum wrought product tubular body (2) having one end open and the other end closed, and an aluminum casting brazed to the open end of the tubular body (2). It has a plenum chamber (1) consisting of a throttle body mount (3). The plenum chamber (1) may be integrally formed of aluminum casting.

A plurality of intake outlets (4) are formed on the peripheral wall of the tubular body (2), and a branch pipe connecting tubular portion (5) is integrally provided around each intake outlet (4). . The pipe expansion part (5a) is formed at the tip of each branch pipe connection tubular part (5).
One end of a plastic U-shaped branch pipe (6) is fitted and joined in the hole (5b) of (5a). The throttle body mounting body (3) is cylindrical and has an outward flange (7) integrally provided at one end thereof. The open end of the tubular body (2) should fit into the hole (8) in the throttle body mounting body (3).
It is brazed to the throttle body mount (3) while it is inserted inside. And throttle body attachment
A throttle body (not shown) is attached to (3) using the outward flange (7), and the air supply pipe from the air cleaner is connected to this.

Below the plenum chamber (1) are branch pipes.
An aluminum casting cylinder head mounting flange (9) for connecting the other end of (6) to a cylinder head of an engine (not shown) is arranged. The cylinder head mounting flange (9) has the same number of through holes (not shown) as the branch pipes (6), and the branch pipe connecting tubular part (11) is formed around the through holes.
Are provided integrally. Cylindrical part for connecting each branch pipe (11)
The tube expansion part (11a) is formed at the tip of the tube and the hole of the tube expansion part (11a)
Inside the (11b), the other end of the plastic U-shaped branch pipe (6) is fitted and joined. Further, above the branch pipe connecting tubular portion (11), the insertion portion (1
2) is integrated. The cylinder head mounting flange (9) may be made of wrought aluminum.

As shown in FIG. 2, the plenum chamber (1)
Hole (5b) in expanded part (5a) of tubular part (5) for connecting branch pipe of
An annular groove (13) is formed on the inner peripheral surface of the
In the annular groove (13), an annular projection (14) integrally provided on the outer peripheral surface of one end of the branch pipe (6) is forcibly fitted. Although not shown in the drawing, an annular groove is also formed over the entire circumference on the inner peripheral surface of the hole (11b) in the expanded portion (11a) of the branch pipe connecting tubular portion (11) of the cylinder head mounting flange (9). An annular protrusion integrally provided on the outer peripheral surface of the other end of the branch pipe is forcibly fitted into the annular groove.

Next, a method of manufacturing the intake manifold will be described.

First, a cylindrical parison having open ends is extruded, for example, and one end of the cylindrical parison is formed at the plenum chamber (1).
In the hole (5b) of the expanded part (5a) of the tubular part (5) for connecting the branch pipe of
The other end is inserted into the hole (11b) of the pipe expanding portion (11a) of the branch pipe connecting tubular portion (11) of the cylinder head mounting flange (9). Then, the plenum chamber (1), the cylinder head mounting flange (9), and the parison are set in the blow molding die. After that, air is blown into the parison to expand the parison to form the branch pipe (6), and the outer peripheral surfaces of both ends thereof are joined to the inner peripheral surfaces of the holes (5b) and (11b). Moreover, at the same time, the branch pipe (6)
The both ends of the plastic material are filled in the annular groove (13), thereby forming the annular protrusion (14) forcibly fitted in the annular groove (13). In this way, the intake manifold is manufactured.

In the above embodiment, the plenum chamber
(1) and the hole (5b) in the pipe expansion part (5a) (11a) of the tubular part (5) (11) for branch pipe connection of the cylinder head mounting flange (9)
An annular groove (13) is formed on the inner peripheral surface of (11b),
In the annular groove (13), annular projections which are integrally provided on the outer peripheral surfaces of both ends of the branch pipe (6) over the entire circumference are forcibly fitted, but they are not always necessary.

[0019]

As described above, according to the method of manufacturing the intake manifold of the present invention, the branch pipe having a predetermined shape and the joining of the branch pipe to the plenum chamber and the cylinder head mounting flange are simultaneously performed as described above. Since it can be performed, the number of man-hours is reduced and the manufacturing work is simplified as compared with the conventional manufacturing of the intake manifold provided with the plastic branch pipe.

[Brief description of drawings]

FIG. 1 is a perspective view showing an intake manifold manufactured according to the present invention.

FIG. 2 is a partially enlarged sectional view of the same.

[Explanation of symbols]

 1 Plenum chamber 5b hole 6 Branch pipe 9 Cylinder head mounting flange 11b hole

Claims (1)

[Claims] 1. An aluminum plenum chamber, an aluminum cylinder head mounting flange, and one end of each of which is connected to the plenum chamber while being inserted into a hole formed in the plenum chamber, and each other end of which is mounted on a cylinder head. A method for manufacturing an intake manifold comprising a plastic branch pipe connected to a cylinder head mounting flange while being inserted into a hole formed in the flange, wherein one end of a cylindrical parison with both ends opened is attached to the plenum chamber. After inserting the other end into the hole in the cylinder head mounting flange, set the plenum chamber, cylinder head mounting flange and parison in the blow molding die, and then blow air into the parison to expand the parison. By forming a branch pipe by Method of manufacturing an intake manifold, wherein a is bonded to the inner peripheral surface of the plenum chamber and the cylinder head mounting flange holes.