JPH07233765A - Intake manifold - Google Patents

Abstract

PURPOSE:To lighten a mounting flange to a cylinder head light in weight, and lighten the whole of the intake manifold in weight in its turn by providing a through hole for the aforesaid mounting flange. CONSTITUTION:This invention is concerned with the intake manifold 1 equipped with a plenum chamber 3 made of aluminum having an inlet port and a plurality of outlet ports 2, a plurality of branch pipes 4 made of expanded aluminum connected to the respective outlet ports 2 of the plenum chamber 3, and with a mounting flange 5 to a cylinder head to which the tip ends of all branch pipes 4 are connected. A through hole 8 is formed in the mounting flange 5 of the cylinder head to lighten the weight.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake manifold used in, for example, a gasoline engine for automobiles or a diesel engine for automobiles.

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, a gasoline engine of an automobile, an aluminum plenum chamber having an intake inlet and a plurality of intake outlets and a plurality of aluminum expansions connected to the intake outlets of the plenum chamber have been conventionally used. It is known to have a material branch pipe and a flange for mounting on a cylinder head to which the tips of all the branch pipes are connected.

[0004]

However, the conventional intake manifold has a problem that the weight of the whole intake manifold becomes large and the performance of the automobile using the intake manifold deteriorates.

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

[0006]

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 wrought material branch pipes connected to the intake outlets of the plenum chamber. And an intake manifold having a flange for mounting on a cylinder head to which the ends of all branch pipes are connected, a flange for mounting on a cylinder head is provided with a through hole for weight reduction. is there.

In the above description, the flange for mounting on the cylinder head may be formed of either an aluminum wrought material or an aluminum casting.

[0008]

When the through hole for reducing the weight is formed in the flange for mounting on the cylinder head, it is possible to reduce the weight of the flange and thus the weight of the intake manifold as a whole.

[0009]

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

FIG. 1 shows the overall construction of an intake manifold for an automobile, FIG. 2 shows a flange for mounting on a cylinder head, and FIG. 3 shows a method for manufacturing a flange for mounting on a cylinder head.

Referring to FIG. 1, an intake manifold for an automobile.
(1) is an aluminum casting plenum chamber having one intake inlet (not shown) and multiple intake outlets (2)
(3), multiple extruded aluminum branch pipes (4) connected to each intake outlet (2) of the plenum chamber (3), and the tips of all branch pipes (4) were connected together Flange for mounting on cylinder head made of extruded aluminum
(5) and are equipped. Each branch pipe (4) is connected to a cylinder head (not shown) of the engine via a mounting flange (5).

An outward flange (3a) is integrally formed around the intake inlet of the plenum chamber (3), and a throttle body (not shown) having a throttle valve is attached to the outward flange (3a). The air supply pipe from the air cleaner is connected to this throttle body.

As shown in FIG. 2, the same number as the branch pipe (4) for inserting the tip of the branch pipe (4) into the flange (5) for attachment to the cylinder head and joining it by brazing or the like. Through hole (6), a plurality of mounting holes (7) for mounting the mounting flange (5) to the engine cylinder head, and a through hole (8) for weight reduction. . The formation position and shape of the through hole (8) for weight reduction will vary depending on the shape and size of the intake manifold (1) and the shape and size of the cylinder head, but the strength of the mounting flange (5) will decrease. Alternatively, the mounting flange (5) does not warp when mounted on the cylinder head of the engine. In order to reduce the weight of the mounting flange (5), it may be possible to form a notch instead of the through hole (8), but in this case, the strength of the mounting flange (5) decreases, so Not preferable.

Flange for mounting on cylinder head (5)
Is manufactured, for example, as follows. That is, as shown in FIG. 3, a hollow portion (11) for forming a through hole (6) for inserting the tip portion of the branch pipe (4) and a hollow portion (12) for forming a mounting hole (7). And a hollow part for forming a through hole (8) for weight reduction
An aluminum extruded profile (10) having (13) is extruded. Then, this aluminum extruded shape is cut into a proper length (suitable thickness), and thus a flange (5) for mounting on a cylinder head is manufactured. According to this method, a plate-like body having the same outer shape as the mounting flange (5) is made by an appropriate method, and then a through hole for inserting the tip of the branch pipe (4) and a through hole for weight reduction are formed. The material yield is improved and the cost is reduced as compared with the method of manufacturing by forming the holes by pressing, cutting or the like.

The method of manufacturing the flange for mounting on the cylinder head is not limited to the above-mentioned method, and can be changed as appropriate.
For example, it may be a method of manufacturing the whole by casting including a through hole for inserting the tip of the branch pipe, a mounting hole, and a through hole for weight reduction. Further, after casting a plate-shaped body having the same outer shape as the mounting flange, a through hole for inserting the tip end of the branch pipe, a mounting hole, and a through hole for weight reduction are formed.
It may be a method of manufacturing by forming by pressing, cutting, or the like.

[0016]

As described above, according to the intake manifold of the present invention, it is possible to reduce the weight of the flange for attachment to the cylinder head, and thus to reduce the weight of the intake manifold as a whole. Therefore, the performance of an automobile using the same can be improved. Further, if the flange for attachment to the cylinder head is formed with a through hole for reducing the weight, the material for forming the flange is small and the cost is low.

[Brief description of drawings]

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

FIG. 2 is a plan view showing a flange for mounting on a cylinder head.

FIG. 3 is a perspective view showing an example of a method for manufacturing a mounting flange for a cylinder head.

[Explanation of symbols]

 (1) Intake manifold (2) Intake outlet (3) Plenum chamber (4) Branch pipe (5) Cylinder head mounting flange (8) Through hole

Claims (1)

[Claims] 1. An aluminum plenum chamber having an intake inlet and a plurality of intake outlets, a plurality of aluminum wrought product branch pipes connected to the respective intake outlets of the plenum chamber, and tips of all the branch pipes are connected. An intake manifold having a mounting flange for a cylinder head, wherein the mounting flange for a cylinder head is formed with a through hole for weight reduction.