JPH0732906Y2 - Intake pipe of internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an improvement of an intake pipe connected to an intake manifold of an internal combustion engine, particularly a multi-cylinder engine.

[Conventional technology]

Conventionally, as an intake device of an engine, by utilizing the intake inertia effect, at low speed, the intake system is lengthened so that the speed of intake air resonates with the engine speed, and intake air enters the cylinder by inertia. It is known to increase the explosion pressure.

In particular, like a truck, in order to increase the intake efficiency with a large displacement, if the engine speed is low, the length of the resonance intake pipe of the intake system must be made extremely long.
To meet the demands of designers who want to make the engine room as small as possible, the challenge was how to layout the resonant intake pipe without sacrificing maintainability, appearance, and cost.

Moreover, for example, in a 6-cylinder engine, when the front 3 cylinders and the rear 3 cylinders are separated, the resonance intake pipes of the front 3 cylinders and the rear 3 cylinders must have the same length. Was strict and often spent time on design.

In addition, in the engine room where the temperature rises to 90 ° C on average at full load, it is possible to use an intercooler with 50
The intake air cooled to below ℃ rises by about 5 ℃, which is a disadvantage in terms of performance.

Therefore, conventionally, in order to solve the above problems,
There was something like that shown in FIG.

That is, in the drawings, 1 is not shown, but, for example, 6
An intake manifold connected to each intake port of a cylinder type engine, which is divided into a front intake chamber that communicates with the front three cylinder intake ports and a rear intake chamber that communicates with the rear three cylinder intake ports. Both of the intake chambers are open to two adjacent intake ports 1A and 1B. Resonant intake pipes 2A and 2B are respectively connected to the intake ports 1A and 1B.

4 and 5 show another conventional example, in which 1 is an intake manifold connected to each intake port of the 6-cylinder engine 2, and the intake manifold 1 is an intake port of the front 3 cylinders. Is divided into a front intake chamber 3A communicating with the rear intake chamber 3A and a rear intake chamber 3B communicating with the intake ports of the rear three cylinders.

Then, in the single intake pipe 4 connected to the intake port of the intake manifold 1, the longitudinal direction thereof is divided into two and communicated with the front intake chamber 3A and the rear intake chamber 3B separately. The partition wall 5 forming the equivalent conduits 5A and 5B is formed (see Japanese Utility Model Laid-Open No. 57-150229).

[Problems to be solved by the invention]

However, the first conventional example has two resonance intake pipes.
Since the diameters of 2A and 2B are small and both resonance intake pipes 2A and 2B are long, they have to be separated from each other so that they are not in contact with each other, so that there is a drawback that the space for the pipes becomes very wide.

Further, in the second conventional example, since the intake pipe 4 is long, it is important that the bending direction can be freely set.
Since the partition wall 5 has a flat plate shape, it is difficult to bend the partition wall 5 in the vertical direction, and the intake pipe 4 or the partition wall 5 is cracked or the like and cannot be bent with a predetermined radius of curvature. Further, when bent, the partition wall 5 is deformed and the two pipe lines 5A and 5B divided by the partition wall 5 have different cross-sectional areas.

[Means for solving problems]

The present invention has been made to solve the above-mentioned conventional problems, and facilitates bending of the resonance intake pipe, simplifies the layout of the resonance intake pipe, and makes it compact. The purpose of the present invention is to provide an intake pipe that can be made, and the gist thereof is that the inside of the intake pipe connected to the intake manifold is divided into two by a corrugated partition wall along its longitudinal direction. In the intake pipe.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in FIGS. 1. FIG. 1 is a longitudinal sectional view of an essential part of a state in which an intake pipe according to the present invention is connected to an engine, and FIG. 2 is a perspective view of the essential part.

In the drawing, reference numeral 1 denotes an intake manifold connected to each intake port of a multi-cylinder engine 2 such as a 6-cylinder engine, and includes a front intake chamber 3A communicating with intake ports of three cylinders in front of the engine 2 and a rear part thereof. The intake port is divided into a rear intake chamber 3B and a rear intake chamber 3B communicating with the intake ports of the three cylinders. The intake ports 3A and 3B are divided into two circular holes 4 by a vertical partition wall 5.
Opened to 4A and 4B respectively. Here, as the partition wall 5, a partition wall formed in a corrugated shape in the vertical width direction is used.

Reference numeral 6 denotes a resonance intake pipe connected to the intake ports 4A and 4B of the intake manifold 1. Inside the resonance intake pipe 6, the partition wall 5 is provided.
Corresponding to, the conduits 6A and 6B having the same cross-sectional area are formed on the left and right sides by the vertical partition wall 7 that divides the longitudinal direction into two. Here, as the partition wall 7, one having a corrugated shape having the same shape as the partition wall 5 is used.

The resonance intake pipe 6 with the partition wall 7 is integrally formed by, for example, extrusion molding of aluminum.

[Operation of Example]

Therefore, when the resonance intake pipe 6 is bent, since the partition wall 7 is fixed in the vertical direction, it can be relatively easily bent in the direction X orthogonal to the vertical direction of the partition wall 7 with a predetermined radius of curvature.
Further, since the partition wall 7 is formed in a corrugated shape in the vertical width direction, when the resonant intake pipe 6 is bent in the vertical direction Y of the partition wall 7, the partition wall 7 contracts so that it can be easily bent with a predetermined radius of curvature. At this time, the sectional areas of the two conduits 6A and 6B divided by the partition wall 7 change to be the same.

[Effect of device]

As described above, the intake pipe of the internal combustion engine according to the present invention has a configuration in which the inside of the intake pipe connected to the intake manifold is divided into two parts by corrugated partition walls along the longitudinal direction thereof. It is possible to freely bend with a predetermined radius of curvature.

Therefore, there is less space for piping, the layout of the resonance intake pipe can be simplified, and there are cost advantages because it is easy to produce, and it is possible to make it compact and maintain the engine. Do not get in the way when you do.

Furthermore, since the passage in the intake pipe can be used effectively, a lightweight design is possible, and since there is only one intake pipe, the surface area can be reduced.In the case of an engine with an intercooler, the intake air temperature rises depending on the engine room temperature. There are various effects that it is difficult to do.

[Brief description of drawings]

FIG. 1 is a transverse cross-sectional view of a main portion of an intake pipe according to the present invention connected to an engine, FIG. 2 is a perspective view of the main portion of the intake device, and FIG. 3 is an intake device of a conventional multi-cylinder engine. FIG. 4 is a perspective view of a main part, and FIG. 4 is a horizontal cross-sectional view of a main part showing still another conventional intake system for a multi-cylinder engine, and FIG. 5 is a cross-sectional view taken along line II-II of FIG. 1 ... intake manifold, 2 ... multi-cylinder engine, 3
A, 3B ... intake chamber, 4A, 4B ... intake port, 5 ... partition wall, 6
...... Intake pipe, 6A, 6B ...... Pipe line, 7 ...... Partition wall.

Claims (1)

[Scope of utility model registration request] 1. An intake pipe connected to an intake manifold,
An intake pipe for an internal combustion engine, characterized in that it is divided into two parts by a corrugated partition wall along its longitudinal direction.