JPH0712685Y2 - Intake manifold - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake manifold used in, for example, an automobile engine, particularly a V-type engine.

In this specification, the term "aluminum" includes aluminum alloy as well as pure aluminum. In addition, "expanded material" means extrusion processing,
It is formed by plastic processing such as impact extrusion processing and forging.

[0003]

2. Description of the Related Art For example, a conventional intake manifold used for a gasoline engine of an automobile equipped with an electronically controlled fuel injection device was manufactured entirely by casting.

[0004]

However, since the surface of the cast product is rough, it is necessary to finish at least the inner surface of the cast product in order to reduce the air resistance in order to improve the intake efficiency. There was a problem that was troublesome. Moreover, it is impossible to finish the entire inner surface of the intake manifold due to its shape, and it has been impossible to sufficiently reduce the air resistance for improving intake efficiency. Also, for cast intake manifolds,
Due to the flowability of the molten metal at the time of casting, the wall thickness of the peripheral wall cannot be reduced below a certain limit, resulting in an increase in weight.

An object of the present invention is to solve the above problems and to provide an intake manifold which can be well adapted to a narrow mounting space.

[0006]

In order to achieve the above-mentioned object, an intake manifold according to the present invention is an aluminum wrought material having one end open and the other end closed and a flat upper wall formed. Consisting of a horizontal main pipe consisting of, and a plurality of branch pipes of the same length made of aluminum wrought material, each end of which is connected to the upper wall side of the main pipe, and the inside of the main pipe is
It extends in the length direction and is divided into a pair of left and right sections over the entire length, the branch pipes are alternately connected to the left section and the right section, and the branch pipes connected to the left section are approximately 1/4. The branch pipe is bent in an arc and extends horizontally to the right, and the branch pipe connected to the right section is bent in an approximately 1/4 arc and extends horizontally to the left.

In this specification, "left" means "left side" in FIG. 2, and "right" means "right side" in FIG.
Refers to.

The intake manifold is applied to an internal combustion engine such as an automobile engine equipped with a carburetor or an automobile engine equipped with an electronically controlled fuel injection device.

In the above description, the partition wall between the respective compartments inside the main pipe is integrally formed when the main pipe is molded by extrusion, impact extrusion or the like.

A plurality of holes are formed in the peripheral wall of the main pipe, and branch pipe connecting outwardly projecting tubular portions are integrally formed around each hole, and the outwardly projecting tubular portions are branched. It is preferred that the tubes are connected in a mated condition. The outwardly projecting tubular portion for connecting a branch pipe is, for example, a tube whose tip is closed by making a hole in the peripheral wall of the main pipe and then subjecting the peripheral portion of this hole to burring or bulging the peripheral wall of the main pipe. After forming the bulging portion, it is preferable to form a hole in the front end closing wall and perform burring around the hole.

[0011]

The intake manifold according to the present invention comprises a horizontal main pipe made of aluminum wrought material with one end open and the other end closed, and a plurality of aluminum wrought materials of the same length each having one end connected to the main pipe. The inner surface of the intake manifold is smoother than that of the conventional intake manifold which is entirely made of a cast product.

Further, the horizontal main pipe is formed with a flat upper wall portion, and the branch pipes are alternately connected to the left section and the right section from the upper wall side of the main pipe, and at the left section. The connected branch pipe is bent about 1/4 arc and extends horizontally to the right, and the branch pipe connected to the right section is bent about 1/4 arc and extends horizontally to the left. The branch pipe has a required length and the entire intake manifold has a compact form.

[0013]

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

The intake manifold shown in the figure is used for a V-type 8-cylinder engine, and is made of an aluminum material having one end open and the other end closed and a flat upper wall (11a). It is provided with a horizontal main pipe (10) made of a drawn material and eight branch pipes (20A) (20B) made of an aluminum extruded pipe each end of which is connected to the main pipe (10).

The main pipe (10) is an extruded pipe (1
1) and the pipe (11) brazed to one end of the extruded pipe (11)
It consists of a cover (12) made of aluminum wrought material that closes the opening.
Inside the extrusion pipe (11), a pair of left and right compartments (13)
A partition wall (15) divided into (14) is integrally provided over the entire length. Four holes (16) are formed in the upper wall (11a) at positions corresponding to both the compartments (13) and (14), and a branch pipe connecting outwardly projecting tubular portion (around each hole (16) ( 17) is integrally formed. Expanding cylinder at the tip of the outward protruding cylinder (17)
(18) is formed. Also, at the open end of the main pipe (10),
The throttle body mounting flange (19) made of cast aluminum is fixed. A throttle body (not shown) having a built-in throttle valve is attached to the throttle body mounting flange (19), and an air supply pipe from an air cleaner is connected to the throttle body.

The eight branch pipes (20A) and (20B) are in the left section (13).
The branch pipe (20A), which is alternately connected to the right section (14) and connected to the left section (13), is bent about 1/4 arc to extend horizontally to the right and to the right. The branch pipe (20B) connected to the section (14) is bent in an approximately 1/4 circular arc and extends horizontally to the left. More specifically, each of the branch pipes (20A) and (20B) is formed by bending a straight aluminum extruded pipe, and its end portion has an outwardly projecting tubular portion (17) and an expanded tubular portion (17). 18) It is fitted inside and brazed. The tips of the four branch pipes (20A) connected to the outwardly projecting cylinder part (17) of the left section (13) are mounted on the cylinder head arranged to the right of the main pipe (10). It is connected to the flange (21). Also, the tips of the four branch pipes (20B) connected to the outwardly projecting tubular portion (17) of the right section (14) are for attachment to the cylinder head arranged to the left of the main pipe (10). It is connected to the mounting flange (21). Both mounting flanges (21) are made of cast aluminum and have a horizontal rectangular shape, and have four holes (not shown) and a bend for branch pipe connection integrally provided around the holes. It is provided with a protruding cylinder part (22) and an injector insertion port (23). An expanding cylinder portion (24) is provided at the tip of the protruding cylinder portion (22). Then, each branch pipe (20A) (20
B) is connected to the cylinder head of the engine body (E) via both flanges (21).

In such an intake manifold, the air sent from the air cleaner is supplied to both compartments (1) of the main pipe (10).
3) It enters into (14) and is sent to each cylinder of the engine body (E) through the branch pipe (20).

The amount of air sent to each cylinder of the engine body (E) is adjusted by separately controlling the flow rate of air in both sections (13) and (14) of the main pipe (10).

In the above embodiment, the intake manifold used in the V-type 8-cylinder engine is shown.
It can also be applied to a V-type 6-cylinder engine or the like.

[0020]

According to the intake manifold of the present invention, since the inner surface of the intake manifold is smoother than that of the conventional intake manifold which is entirely made of a cast product, air resistance is reduced and intake efficiency is improved. Moreover, it is not always necessary to perform finish processing as in the case of conventional cast products. Further, it becomes possible to reduce the weight as compared with the conventional cast product.

Further, since the branch pipe has a compact shape while maintaining the required length, the intake manifold has an advantage that it can be well adapted to a narrow mounting space.

[Brief description of drawings]

FIG. 1 is a plan view in which a part of an intake manifold is cut away.

FIG. 2 is a sectional view taken along line II-II in FIG.

[Explanation of symbols]

 (10) Main pipe (11a) Upper wall (13) Left compartment (14) Right compartment (20A) (20B) Branch pipe

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location F02M 35/116 F02M 35/10 102 V 301 A

Claims (1)

[Scope of utility model registration request] 1. A horizontal main pipe (10) made of an wrought aluminum material, one end of which is open and the other end of which is closed, and a flat upper wall (11a) is formed; Main pipe (10) consists of multiple branch pipes (20A) (20B) of the same length made of aluminum wrought material connected to the upper wall (11a) side.
The interior of the is divided into a pair of left and right compartments (13) (14) extending in the lengthwise direction, and the branch pipes (20A) (20B) are divided into left compartment (13) and right compartment (14). Alternately connected to
The branch pipe (20A) connected to the left section (13) is bent about 1/4 arc and extends horizontally to the right, and the branch tube (20B) connected to the right section (14) is about 1 / 4 Intake manifold that is bent in an arc and extends horizontally to the left.