JP2526638Y2 - Intake manifold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICATION This invention relates to an intake manifold used, for example, in automobile engines.

In this specification, the term “aluminum” includes an aluminum alloy in addition to pure aluminum. In this specification, the term “extended material” refers to an article formed by plastic working such as extrusion, impact extrusion, forging, and press forming.

2. Description of the Related Art For example, as an intake manifold used for a gasoline engine of an automobile, a box-shaped chamber body made of wrought aluminum and a plurality of branch pipe connection ports are formed, and the opening is closed by brazing to the chamber body. And a plurality of aluminum wrought material branch pipes connected to the branch pipe connection port of the lid, wherein the lid is formed of an aluminum brazing sheet having a brazing material layer on the inner surface, and the branch pipe connection of the lid is performed. An outwardly projecting cylindrical flange is integrally formed around the mouth, an expanded portion is formed at the tip of the cylindrical flange, and the branch pipe is inserted into the expanded portion of the cylindrical flange. Brazing is known (Japanese Unexamined Patent Publication No.
No. 125557).

Problems to be Solved by the Invention However, in the above-mentioned conventional intake manifold, since the brazing filler metal remains on the inner surface of the lid and has a rough surface, there is a problem that the air resistance increases and the intake efficiency is not sufficient. is there.

The purpose of this invention is to provide an intake manifold that solves the above problems.

Means for Solving the Problems The intake manifold according to the present invention has a box-shaped chamber body made of wrought aluminum, a plurality of branch pipe connection ports formed therein, and a lid which is brazed to the chamber body to close the opening. And a plurality of aluminum wrought material branch pipes connected to the branch pipe connection port of the lid, wherein the lid is formed of an aluminum brazing sheet having a brazing material layer only on the outer surface, and the branch pipe of the lid An outwardly projecting cylindrical flange is integrally formed around the connection port, and the branch pipe is brazed to the lid while being fitted over the circumference of the cylindrical flange.

In the above, the surface roughness of the inner surface of the chamber body, the lid and the branch pipe is not more than 10 μm, preferably not more than 5 μm, and desirably not more than 1 μm in center line average roughness.
This is because the ventilation resistance is reduced and the intake efficiency is improved, and when this is mounted on an engine, the performance such as output and torque is improved.

Function Since the lid is formed of an aluminum brazing sheet having a brazing material layer only on the outer surface, no brazing material is present on the inner surface of the lid, and the inner surface is kept smooth.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The drawings show one embodiment of an intake manifold used in a V-type eight-cylinder automobile engine.

In FIGS. 1 to 4, the intake manifold (1)
Hollow plenum chamber made of wrought aluminum (2)
And eight branch pipes (3) made of a wrought aluminum material connected to the plenum chamber (2), and a throttle body mounted on the upper surface of the plenum chamber (2) in communication with the inside of the chamber (2). And a connector (4).

The plenum chamber (2) comprises a box-shaped chamber body (10) made of an aluminum press-formed product opened upward,
Aluminum brazing sheet lid (20) brazed to the upper end of the chamber body (10) and closing the upper end opening
And

At the top of the peripheral wall (11) of the chamber body (10), a step (1
Through 2), an outwardly expanding portion (13) is formed integrally over the entire circumference.

The lid (20) is made of an aluminum brazing sheet having a brazing material layer (21) formed only on the outer surface. A lower bent portion (22) is integrally formed on the periphery of the lid (20) over the entire periphery. The lid (20) has eight branch pipe connections (2
3) is formed, and an upwardly projecting cylindrical flange (24) for branch pipe connection is integrally provided in a rising shape around each branch pipe connection port (23). At the right end of the lid (20), a connection port (25) for mounting a throttle body mounting connector (4) is formed, and around the connection port (25), an upwardly projecting cylindrical flange for connector connection. 26) are integrally provided in a rising shape. Therefore, the downward bend (22)
, The outer peripheral surface of the upwardly projecting cylindrical flange for branch pipe connection (24) and the upwardly projecting cylindrical flange for connector connection (2
6) is covered with a brazing material layer (21A) connected to the brazing material layer (21). And the lid (20)
The lower bent portion (22) is fitted into the outer widened portion (13) of the chamber body (10), and the lower bent portion (22) is brazed to the outer widened portion (13). It is fixed to (10).

Each branch (3) is made by bending an extruded aluminum pipe. And each branch pipe (3)
An expanded portion (31) is formed at one end of the expanded portion (31).
Is fitted around the upwardly projecting cylindrical flange (24) of the lid (20) and brazed to the flange (24). The inside diameter of the branch pipe (3) is substantially equal to the inside diameter of the upper end of the flange (24). Four branch pipes (3) out of the eight branch pipes (3) extend rightward and are attached to a mounting member (5) to a cylinder head disposed on the right side of the plenum chamber (2).
The other four branch pipes (3) extend to the left and are collectively connected to a mounting member (5) for a cylinder head disposed on the left side of the plenum chamber (2). Each branch pipe (3) is connected to a cylinder head (not shown) of the engine via 5). The attachment member (5) to the cylinder head may be made of any of wrought aluminum and cast aluminum. The two mounting members (5) are each rectangular in shape,
It comprises four holes (51) and a branch pipe connecting tubular portion (52) integrally provided around the holes (51), extending upward and bent toward the plenum chamber (2). I have. An expanded portion (53) is provided at the tip of the tubular portion (52). Further, the fuel injection device insertion hole (54) is provided adjacent to the branch pipe connecting tubular portion (52) in the mounting member (5) to the cylinder head.
Are formed. Each of the branch pipes (3) is inserted into the expanded pipe section (53) at the tip of the tubular section (52) to form the tubular section (52).
It is brazed to.

Chamber body (10), lid (20), and branch pipe (3)
The surface roughness of the inner surface of each is the center line average roughness (Ra)
10 μm or less, preferably 5 μm or less, desirably 1 μm
It is as follows.

A large diameter portion (41) is formed at the lower end of the throttle body mounting connector (4). The large diameter portion (41) is formed around a cylindrical flange (26) formed on the lid (20). Fitted and brazed. Further, a throttle body (not shown) having a built-in throttle valve is attached to the connector (4), and an air supply pipe from an air cleaner is connected to the throttle body.

Such an intake manifold (1) is manufactured as follows. That is, the downward bent portion (22) of the lid (20) is fitted into the outwardly expanded portion (13) of the chamber body (10),
One end expanding portion (31) of the branch pipe (3) is fitted over the cylindrical flange portion (24) of the lid (20), and the other end of the branch pipe (3) is placed in the hole (51) of the mounting member (5). The connector (4) is manufactured by brazing them all at once with the large-diameter portion (41) of the connector (4) being fitted over the cylindrical flange portion (26).

FIG. 5 shows a modification of a portion where the branch pipe (3) is attached to the lid (20). In FIG. 5, the branch pipe (3) is not provided with an expanded portion, and the inner peripheral surface of the branch pipe (3) and the upwardly projecting cylindrical flange (24) for connecting the branch pipe are flush with each other. is not.

According to the intake manifold of the present invention, as described above,
Since the inner surface of the lid is kept smooth, the air resistance is reduced and the air intake efficiency is improved. When this is mounted on the engine, the performance such as output and torque is improved.

[Brief description of the drawings]

1 is a plan view, FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, and FIG.
FIG. 4 is a partially enlarged view of FIG. 2, FIG. 4 is an enlarged sectional view taken along the line IV-IV of FIG. 1, and FIG. 5 is a view corresponding to FIG. is there. (1) ... intake manifold, (3) ... branch pipe, (10)
... chamber body, (20) ... lid, (21) ... brazing material layer, (23) ... branch pipe connection port, (24) ... upwardly projecting cylindrical flange for branch pipe connection.

Claims (1)

(57) [Scope of request for utility model registration] 1. A box-shaped chamber body made of aluminum wrought material, a plurality of branch pipe connection ports formed therein, a lid brazed to the chamber body to close an opening thereof, and a branch pipe connection port of the lid. In the intake manifold having a plurality of connected aluminum wrought branch pipes, the lid is formed of an aluminum brazing sheet having a brazing material layer only on the outer surface, and is formed around the branch pipe connection port of the lid, outwardly. An intake manifold in which a protruding cylindrical flange is integrally formed, and a branch pipe is brazed to a lid in a state of being fitted around the cylindrical flange.