JPH10213025A - Intake manifold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve efficiency of air inflow from a plenum chamber to each branch pipe without changing the inside and outside diameters of each branch pipe over its whole length. SOLUTION: This manifold 1 is formed in a manner that it is equipped with an aluminum-made plenum chamber 4 having an intake inlet 2 and a plurality of intake outlets 3, and a plurality of aluminum extended material-made branched pipes 5 whose one end is connected to each intake outlet 3 of the plenum chamber 4. In this case, enlarged pipe parts 5a are formed in connection side end parts in the branched pipes 5, to the intake outlets 3 of the plenum chamber 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an intake manifold used for, for example, an automobile engine.

[0002] In this specification, the term "aluminum" shall include aluminum alloys in addition to pure aluminum.

[0003]

2. Description of the Related Art Conventionally, as an intake manifold used for an automobile engine, an aluminum plenum chamber having an intake inlet and a plurality of intake outlets, and a plurality of aluminum wrought materials each having one end connected to the intake outlet of the plenum chamber. A branch pipe is known in which the inner and outer diameters of the respective branch pipes are equal over the entire length (see Japanese Patent Publication No. 7-45853).

[0004]

However, the conventional intake manifold has the following problems. That is, the inflow efficiency of air from the plenum chamber to each branch pipe is improved as the inner diameter of the branch pipe at the end on the connection side to the intake outlet of the plenum chamber increases, but in the conventional intake manifold, Since the inner and outer diameters of each branch pipe are equal over its entire length, each branch pipe must be made thicker over its entire length in order to improve the efficiency of air flow from the plenum chamber to each branch pipe. However, the inner and outer diameters of the branch pipe are determined at appropriate values depending on the engine displacement, the length of the branch pipe, and the like, and cannot be changed without permission. Therefore, if the entire inner and outer diameters of the branch pipes are determined, the efficiency of air inflow from the plenum chamber to each branch pipe cannot be improved.

SUMMARY OF THE INVENTION An object of the present invention is to provide an intake manifold which solves the above-mentioned problems and can improve the efficiency of air inflow from the plenum chamber to each branch pipe without changing the inner and outer diameters of the branch pipe over the entire length. It is in.

[0006]

SUMMARY OF THE INVENTION An intake manifold according to the present invention comprises an aluminum plenum chamber having an intake inlet and a plurality of intake outlets, and a plurality of aluminum plenums having one end connected to the intake outlet of the plenum chamber. In an intake manifold provided with a wrought material branch pipe, an expanded part is formed at an end of the branch pipe on the connection side to the intake outlet of the plenum chamber.

According to the intake manifold of the present invention, since the expanded portion is formed at the end of the branch pipe connected to the intake outlet of the plenum chamber, the plenum chamber can be formed without changing the inner and outer diameters of the branch pipe over the entire length. The efficiency of air inflow to each branch pipe can be improved.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings.

FIG. 1 shows the overall configuration of an intake manifold according to the present invention, and FIG. 2 shows a main part thereof.

In FIG. 1, an intake manifold (1) includes an aluminum plenum chamber (4) having an intake inlet (2) and a plurality of intake outlets (3), and an intake outlet (3) at one end of the plenum chamber (4). ) Are connected to a plurality of branch pipes (5) made of wrought aluminum.

The plenum chamber (4) is an aluminum wrought tubular body having one end opened and the other end closed.
(6) and an aluminum cast throttle body attachment (7) brazed to the open end of the tubular body (6). The entire plenum chamber (4) may be integrally formed of an aluminum casting.

A plurality of intake outlets (3) are formed on the peripheral wall of the tubular body (6), and a cylindrical outwardly projecting portion (8) for connecting a branch pipe is integrally formed around each intake outlet (3). Is provided. As shown in FIG. 2, a large-diameter portion (8b) is formed at a portion of the inner peripheral surface of the branch pipe connecting cylindrical outward protruding portion (8) near the front end through a step (8a).
Are formed.

The throttle body attachment (7) is cylindrical,
One open end of the tubular body (6) is attached to the throttle body
It is inserted into one end of the hole of (7) and brazed to the throttle body mounting body (7). Throttle body attachment
The end opposite to the side connected to the tubular body (6) of (7) is an intake inlet (2). Also, throttle body mounting body
An outward flange (7a) is integrally provided at the end of the intake port (2) side of (7), and a throttle body (not shown) is attached using the outward flange (7a). The air supply pipe from is connected.

Plenum chamber in each branch pipe (5)
An expanded portion (5a) is formed at the end of (4) on the connection side to the intake outlet (3). Since the expanded part (5a) is usually formed by press working, the inner diameter is at most about 1.5 times the inner diameter of the part excluding the expanded part (5a). Then, the expanded portion (5a) is formed into a tubular outwardly projecting portion for connecting a branch pipe of the tubular body (6).
In the state fitted in the large diameter portion (8b) of (8), it is brazed to the cylindrical outward projection (8). Expanding section of branch pipe (5) (5
The tip surface of (a) is in contact with the step (8a). The expansion section (5
The inner peripheral surface of (a) is the large-diameter portion (8b) of the cylindrical outward projection (8).
It is flush with the inner peripheral surface of the part except.

The other end of each branch pipe (5) is connected to a flange (9) for attachment to a cylinder head. Mounting flange
In (9), the same number of through holes (not shown) as the branch pipe (5) are formed, and a tubular outwardly projecting portion (10) for branch pipe connection is integrally provided therearound. An expanded portion (10a) is formed at the tip of the cylindrical outwardly projecting portion (10). The other end of each branch pipe (5) is brazed to the cylindrical outer projection (10) in a state of being fitted into the expanded part (10a) of the cylindrical outer projection (10). I have.

In the intake manifold (1) having the above-described structure, since the expanded pipe (5a) is formed at the end of the branch pipe (5) on the side of the plenum chamber (4) connected to the intake outlet (3), the branch pipe (5) is formed. The air inflow efficiency from the plenum chamber (4) to each branch pipe (5) can be improved without changing the inner and outer diameters of the pipe (5) over the entire length.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing an embodiment of an intake manifold according to the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

[Explanation of symbols]

 (1): Intake manifold (2): Intake inlet (3): Intake outlet (4): Plenum chamber (5): Branch pipe (5a): Expansion section

Claims (1)

[Claims] 1. An intake manifold comprising: an aluminum plenum chamber having an intake inlet and a plurality of intake outlets; and a plurality of aluminum wrought branch pipes having one end connected to the intake outlet of the plenum chamber. An intake manifold having an expanded portion formed at an end of the pipe at a connection side of the plenum chamber to an intake outlet.