JPH0141899Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an intake manifold made of synthetic resin that can be injection molded.

Conventional intake manifolds are usually formed in the shape of a curved tube, and because of their curved shape, they are generally manufactured by sand casting, in which the inner hole of the curved tube is formed using a sand core. be.

By the way, in recent years, intake manifolds have been made of resin as a way to reduce the weight of automobiles.In order to mold the inner hole of the curved pipe, a core is made from a low-melting metal, and after molding, the core is heated and melted to flow out. That's what I was doing.

However, in the case of such conventional resin intake manifolds, a core is made of low-melting metal for each product, and after molding, the core is heated and melted and taken out. There were problems in that a large quantity was required, and that a process of melting the core was required, and that the peripheral surface of the tube inner hole of the intake manifold became rough, resulting in poor intake efficiency.

The present invention was developed by focusing on these conventional problems, and by making the intake manifold into a shape that can be injection molded, it can be manufactured repeatedly with one mold, and the peripheral wall surface of the pipe inner hole can be made with a smooth and good quality. It is an object of the present invention to provide a synthetic resin intake manifold that can be made into a skin.

The present invention will be described in detail below based on embodiments shown in the drawings.

Reference numeral 1 denotes a synthetic resin intake manifold body in which straight branch pipes 2 are arranged in parallel at appropriate intervals, and a box-shaped air collector part 3 with an open front is integrated at the lower part of one end of the branch pipes 2. The air collector portion 3 has an air intake hole 4 formed in one side wall thereof, through which air is supplied.

Note that this intake manifold main body 1 is formed by injection molding because it does not have a curved pipe portion.

Reference numeral 5 denotes a two-part separate duct in which a synthetic resin inner duct part 6 and a synthetic resin outer duct part 7 are tightly joined and screwed to the air collector part 3 side of the intake manifold main body 1. 3 is supplied to each branch pipe section 2. This inner duct portion 6 is provided with a first air hole 8 corresponding to each branch pipe 2, and a second air hole 9 facing the collector portion 3. A first gutter section 10 curved outward between the air hole 8 and the second air hole 9
is provided. Further, the outer duct portion 6 has a second gutter portion 11 that is joined to the first gutter portion 10 of the inner duct portion 5 to form a curved communication pipe that communicates the branch pipe 2 and the air collector portion 3. is curved. The inner duct part 6 and the outer duct part 7 constituting the separate duct 5 are both formed by injection molding because they have a divided structure without a curved tube shape as shown in the drawing.

That is, the intake manifold main body 1 can be injection molded because the branch pipe 2 is shaped like a straight pipe.
In addition, the separate duct 5 has an injection moldable inner duct portion 6 without a tubular portion and an outer duct portion 7.
Since it has a split structure, by screwing the separate duct 5 to the collector portion 3 side of the intake manifold main body 1 after injection molding, an injection molded intake manifold made of synthetic resin can be manufactured. The engine intake air enters the air collector section 3 through the intake hole 4, is distributed to each branch pipe 2 via the separate duct 5, and is supplied to the engine cylinders.

As described above, according to this embodiment, by making the branch pipe 2 of the intake manifold body 1 into a straight pipe shape, the intake manifold body 1 can be injection molded, and furthermore, the air in the collector portion 3 of the intake manifold body 1 can be Since the separate duct 5 that distributes to the branch pipes has a two-part structure with an inner duct part 6 and an outer duct part 7 that can be injection molded, the intake manifold main body 1 can be removed after injection molding.
This has the advantage that a synthetic resin intake manifold can be obtained by a simple operation of assembling it with the separate duct 5.

In addition, by using a metal mold, the branch pipe 2
It becomes possible to finish the inner surface and the inner surfaces of the first gutter section 10 and the second gutter section 11 smoothly, thereby improving the intake efficiency and improving engine performance.

This invention is as described above, and includes a plurality of parallel straight branch pipe sections 2 connected to corresponding cylinders of an internal combustion engine, and an opening that opens on the same side as the intake inlet side of the branch pipe section 2. Since the intake manifold main body 1 consisting of the air collector section 3 having a section is integrally formed from a synthetic resin material, the intake manifold main body can be produced extremely easily and economically by a resin molding method such as injection molding.

Furthermore, it consists of an inner duct part 6 and a separate outer duct part 7, and by overlapping these two duct parts 6 and 7, the inlet of each branch pipe part 2 and the opening of the air collector part 3 are closed. In addition, a first gutter section 10 provided on the inner duct section 6 and a second gutter section 11 provided on the outer duct section 7.
Since the separate duct 5, which overlaps to form a curved pipe section that connects the air collector section 3 and the inlet of the branch pipe section 2, is made of synthetic resin, the inner duct section and the separate duct 5 are made of synthetic resin. The separate duct 5 consisting of the outer duct part of the body can be produced extremely easily and economically using a molding method such as injection molding, and together with the aforementioned economical production of the intake manifold body, the overall production is extremely economical. We are able to provide unique products.

Furthermore, since the entire intake manifold and resin material can be manufactured by resin molding,
The effect is that a large number of intake manifolds can be manufactured using one mold without requiring a core for each product as in the past.

In addition, the mold for the inner peripheral wall of the branch pipe section of the intake manifold body and the inner peripheral wall of the hole in the separate duct section is made of metal, allowing for a smooth surface with a good finish, improving intake efficiency and improving engine performance. It has excellent effects such as

[Brief explanation of the drawing]

The drawing is an exploded perspective view showing an embodiment of the synthetic resin intake manifold according to the present invention. 1... Intake manifold body, 2... Branch pipe, 3... Air collector section, 4... Intake hole, 5
... Separate duct, 6 ... Inner duct part, 7
...Outer duct part, 8...First air hole, 9...
Second air hole, 10...first gutter section, 11...second gutter section.

Claims (1)

[Scope of utility model registration request] An intake consisting of a plurality of parallel straight branch pipe sections 2 connected to corresponding cylinders of an internal combustion engine, and an air collector section 3 having an opening on the same side as the intake inlet side of the branch pipe section 2. The manifold main body 1 is integrally molded from a synthetic resin material, and consists of an inner duct part 6 and a separate outer duct part 7, and by overlapping the two duct parts 6 and 7, the inlet of each branch pipe part 2 is formed. The opening of the air collector section 3 is closed, and the first gutter section 10 provided on the inner duct section 6 and the second gutter section 11 provided on the outer duct section 7 overlap. Therefore, a synthetic resin intake manifold is characterized in that a separate duct 5 in which a curved pipe section connecting the air collector section 3 and the inlet of the branch pipe section 2 is formed is molded from synthetic resin.