JP2000205064A - Intake duct structure for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the intrusion of oil mists into vacuum-operated equipment via vacuum connection openings in intake ducts even when the openings are practically opposed to air intakes also in the intake ducts. SOLUTION: The intake duct structure for internal combustion engines practically opposes an air intake 4 for an air compressor and a vacuum connection opening 5 for vacuum-operated equipment driving to each other in a direction perpendicular to the flow direction of intake air passing an air cleaner 1. Within an intake duct 3 and between the air intake 4 and the vacuum connection opening 5, a bulkhead 6 is interposed consisting of a partition wall extending over a preset length along the intake air flow and dividing the cross section of the intake duct 3 at least in two.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an intake duct of an internal combustion engine, and more particularly to an intake duct provided with an intake port of an air compressor and a negative pressure connection port for driving a negative pressure driven device. The present invention relates to a technique for preventing malfunction of a negative pressure driven device caused by oil mist from a compressor.

[0002]

2. Description of the Related Art The intake duct of an internal combustion engine is a flat open 5-8.
As disclosed in Japanese Patent Publication No. 9863, the main purpose is to guide intake air purified by an air cleaner to an internal combustion engine. Further, since the intake air flowing through the intake duct is purified by an air cleaner, the intake duct has an intake outlet of an air compressor and a negative pressure connection port for driving a negative pressure driven device such as a negative pressure actuator. May be formed.

[0003]

However, when the operation of the air compressor is stopped, the lubricating oil that has lubricated the movable part is sucked out by the intake air flowing through the intake duct and discharged as oil mist into the intake duct. May be done. At this time, if the intake port and the negative pressure connection port are opened at a position substantially opposed to each other, the oil mist discharged into the intake duct is introduced from the negative pressure connection port to the negative pressure driven auxiliary machine, There is a risk of malfunction. For this reason, it is necessary to position the negative pressure connection port upstream of the intake port so that oil mist is not introduced into the negative pressure driven device from the negative pressure port, but due to restrictions on the layout of the intake duct, etc. In some cases, the intake port and the negative pressure connection port have to be located at substantially opposite positions.

[0004] In view of the above-mentioned problems, the present invention has been described in connection with the fact that even when the intake port and the negative pressure connection port are substantially opposed to each other, the oil can be supplied from the negative pressure connection port to the negative pressure driven device. It is an object of the present invention to provide a technique for preventing mist from being introduced and preventing a malfunction of a negative pressure driven device from occurring.

[0005]

For this reason, the invention according to the first aspect of the present invention is directed to an air intake port of an air compressor and a negative drive for driving a negative pressure driven device in a direction perpendicular to the flow direction of the intake air passing through the air cleaner. A suction port of the internal combustion engine in which the pressure connection port is opened substantially opposite to the pressure connection port, wherein a predetermined length is provided between the intake port and the negative pressure connection port inside the intake duct along the intake air flow direction. , A partition wall extending in the direction is formed.

With this configuration, even if the operation of the air compressor is stopped and the lubricating oil is discharged as oil mist into the intake duct by the intake air, the oil mist is blocked by the partition formed in the intake duct, The vacuum connection cannot be reached. Therefore, even when the intake port and the negative pressure connection port are substantially opposed to each other, it is possible to prevent the oil mist from being introduced into the negative pressure driven device from the negative pressure connection port.

The invention according to claim 2 is characterized in that the partition is constituted by a partition wall that divides a cross section of the intake duct into at least two. According to such a configuration,
Since the partition wall is constituted by a partition wall that divides the cross section of the intake duct into at least two parts, for example, when the intake duct is manufactured by casting, it is only necessary to change the core, which increases the number of manufacturing steps and costs. Is suppressed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the attached drawings. FIG. 1 shows an embodiment of an intake duct of an internal combustion engine according to the present invention.

The intake air having passed through the air cleaner 1 passes through a connection duct 2 and an intake duct 3 extending in the lateral direction, and is sucked into a combustion chamber of an internal combustion engine (not shown). Connection duct 2
Has a function of connecting the air cleaner 1 and the intake duct 3, and is formed of an elastic material such as rubber, for example. In the vertical direction of the peripheral wall of the intake duct 3 on the connection duct 2 side, an intake outlet 4 of an air compressor for an air-driven device, and a drive negative pressure connection port 5 for a negative-pressure driven device such as a negative pressure actuator. Are opened at positions substantially facing each other.

Here, the reason why the negative pressure connection port 5 is opened above the intake port 4 is that oil mist accumulated in a lower portion of the intake duct 3 during the stop of the internal combustion engine causes the negative pressure connection port to be opened when the engine is started. This is because it is not introduced from 5. That is, even if the oil mist is introduced into the air compressor from the intake / exhaust port 4, no problem occurs, so the positional relationship is inevitably obtained.

The intake outlet 4 and the negative pressure connection port 5 are
The configuration is not limited to the one that opens in the vertical direction as in the present embodiment, but may be a configuration that opens in the horizontal direction, for example.
In addition, as shown in FIG. 1B, the intake duct 4 in which the intake port 4 and the negative pressure connection port 5 are opened is provided.
A partition wall 6 extending in the horizontal direction that separates the pressure connection port 5 from the negative pressure connection port 5 is formed. The partition wall 6 is formed by a partition wall that divides the cross section of the intake duct 3 into two over a predetermined length along the intake air flow direction.

In consideration of the positional relationship between the intake port 4 and the negative pressure connection port 5, even if oil mist is discharged from the intake port 4, the partition wall 6 has a negative pressure in the entire operation range of the internal combustion engine. It is preferable that the length is such that the oil mist does not reach the connection port 5.
The number of partition walls may be plural instead of one as in the present embodiment.

When the intake duct 3 is manufactured by casting, for example, the partition wall (partition wall) 6 can be integrally formed by dividing the core. For this reason, compared with the conventional intake duct, man-hours and cost increase required for manufacturing can be suppressed, and the present invention can be easily applied.

With this configuration, when the operation of the air compressor is stopped, the lubricating oil is supplied by the intake air to the intake duct 3.
Even if the oil mist is discharged into the inside, the oil mist is blocked by the partition wall 6 formed in the intake duct 3 and cannot reach the negative pressure connection port 5. For this reason, even when the intake outlet 4 and the negative pressure connection port 5 must be located at positions substantially opposite to each other due to restrictions on the layout of the intake duct 3 or the like, the oil mist is generated from the negative pressure connection port 5 by the negative pressure. It is prevented from being introduced into pressure driven equipment. Therefore, it is possible to prevent a malfunction of the negative pressure driven device from occurring.

FIG. 2 shows another embodiment of the intake duct of the internal combustion engine according to the present invention. That is, the intake duct 3A at the portion where the intake outlet 4 and the negative pressure connection port 5 are opened is formed to be separable and fastened to the intake duct main body 3B by bolts or the like. In this case, the partition 6A of the intake duct 3A
Does not reach the predetermined length, so that a partition 6B as shown in the figure is formed also at the end of the intake duct main body 3B. Therefore, when the intake duct 3A is fastened to the intake duct main body 3B, the partition 6
A and the partition 6B are integrally formed to form the partition 6 having a predetermined length.

As described above, when the intake duct 3A at the portion where the intake outlet 4 and the negative pressure connection port 5 are opened is formed so as to be separable, the length of the partition wall in one part is shortened. When manufacturing the core, it is easy to take out the core.

[0017]

As described above, according to the first aspect of the present invention, even when the intake port and the negative pressure connection port are substantially opposed to each other, the oil mist is supplied from the negative pressure connection port to the negative pressure port. Since it is prevented from being introduced into the drive type device, it is possible to prevent the occurrence of operation failure of the negative pressure drive type device.

According to the second aspect of the invention, it is possible to suppress an increase in man-hour and cost required for manufacturing the intake duct.

[Brief description of the drawings]

1A and 1B show an embodiment of the present invention, wherein FIG. 1A is an overall configuration diagram, and FIG. 1B is a cross-sectional view taken along line XX in FIG.

2A and 2B show another embodiment of the present invention, wherein FIG. 2A is an overall configuration diagram, and FIG. 2B is a cross-sectional view taken along the line YY in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air cleaner 3 Intake duct 3A Intake duct 3B Intake duct main body 4 Intake outlet 5 Negative pressure connection port 6, 6A, 6B Partition wall

Claims (2)

[Claims] 1. An intake system for an internal combustion engine in which an intake port of an air compressor and a drive negative pressure connection port of a negative pressure driven device are opened substantially opposite to each other in a direction orthogonal to a flow direction of the intake air passing through the air cleaner. A structure of a duct, wherein a partition wall extending to a predetermined length along an intake air flow direction is formed between an intake outlet and a negative pressure connection port inside the intake duct. Structure of intake duct. 2. The structure of an intake duct for an internal combustion engine according to claim 1, wherein said partition wall is constituted by a partition wall dividing a cross section of said intake duct into at least two.