JPH1137003A - Intake pipe structure of engine for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate assembling work by compactly installing an intake resonator in a vacant space, in an engine for an automobile. SOLUTION: An intake resonator 10 is arranged on an intake system in which an air cleaner l and an intake manifold 2 are connected to each other through a throttle body 9 along a lower case 8 of the air cleaner l, and an opening part 10a of the intake resonator 10 is provided on the side surface of a connecting pipe part 8a projecting to the lower part of the lower case 8. Since attaching work of the intake resonator 10 on a body assembling line in a factory can be abolished by integrating the lower case 8 for constituting the outer wall of the air cleaner 1 with the intake resonator 10, the number of part items is decreased, afterattachment is eliminated, and the cost of parts assembling work can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

2. Description of the Related Art It is known that when an engine of an automobile is started, air passing through an intake passage pulsates due to the stroke of the engine, and an intake resonator is mounted to prevent adverse effects due to the pulsation. The present invention relates to an intake pipe structure of an automobile engine having an intake resonator.

[0002]

2. Description of the Related Art Conventionally, an intake system of an automobile engine is provided with an air cleaner and an intake manifold. An intake pipe is attached to an inlet of the air cleaner, and an intake pipe is extended to the side of the vehicle body to attach an intake resonator. In this case, the intake resonator is supported by a fender apron and mounted at a position away from the engine.

Therefore, in the assembling work, the installation of the air cleaner and the installation of the intake resonator are separate processes, and when the air cleaner and the intake resonator are fixed, they are connected by an intake pipe.

[0004]

However, in order to support the intake resonator, it is necessary to perform a mounting process on the fender apron, and it is necessary to secure a space corresponding to the volume of the intake resonator. In addition, the intake pipe is provided with an adjusting mechanism for absorbing a mounting error between the intake resonator and the air cleaner, thereby complicating the connection operation. Further, since the position of the intake resonator is determined, the arrangement of the intake pipe is also determined, and the degree of freedom in the layout in the engine room is limited. In addition, JP-A-9-4541
Japanese Patent Application Laid-Open Publication No. H11-163873 discloses that a resonator composed of a connector section and a resonator section is mounted on a cylinder head, but the number of parts is large and the assembling work is complicated.

SUMMARY OF THE INVENTION An object of the present invention is to provide an intake pipe structure for an automobile engine which is compact and utilizes an available space, and which is easy to assemble.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, an air cleaner and an intake manifold are connected to an intake system via a throttle body. Characterized in that an intake resonator is arranged along the line.

According to a second aspect of the present invention, in the first aspect of the present invention, an opening of the intake resonator is provided near a connection point between an outer wall of the air cleaner and the throttle body.

In addition, by integrally providing the intake resonator on the outer wall below the air cleaner, the number of assembling steps is reduced. Further, the air cleaner and the intake resonator may be communicated with each other through a pipeline.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 1 and 2, the intake system of the engine includes an air cleaner 1 and an intake manifold 2, and a branch 4 of the intake manifold 2 is connected to an engine body 3. Here, the surge tank 5 of the intake manifold 2 is located closer to the engine body 3 and below the intake port 6, and the branch 4 extends from the surge tank 5 to the side opposite to the engine body 3 and is turned upside down. It is connected to an intake port 6 of the engine body 3.

The outer wall of the air cleaner 1 is formed by connecting an upper case 7 and a lower case 8 which are divided into two parts. A connecting pipe 8a protrudes from the lower surface of the lower case 8, and the throttle body 9 extends downward. The lower end of the throttle body 9 is connected to the intake port 5a of the surge tank 5. Therefore, the branch 4 passes between the air cleaner 1 and the surge tank 5, and as shown in FIG.
Each branch 4 is connected to the intake port 6 across the throttle body 9. In other words, the throttle body 9 and the air cleaner 1 are arranged directly above the intake manifold 2.

As shown in FIG. 1, an intake resonator 10 is provided above the intake manifold 2 and integrated with the lower case 8 of the air cleaner 1. The intake resonator 10 is connected to a throttle pipe 9 connected to the throttle body 9. An opening (opening 10a) is formed on the side surface of the portion 8a. As shown in FIG. 3, the engine body 3 and the air cleaner 1 are close to each other, and an intake resonator 10 is attached to the throttle body 9 on the engine body 3 side.

The intake resonator 10 is arranged along the outer wall of the air cleaner 1 so as not to protrude from the air cleaner 1 so as to prevent intake pulsation. For example, in a four-cylinder engine as shown in FIG.
For the 2000-2000cc class, intake resonator 10
Is about 200-400 cc. The diameter of the opening 10a opened to the coupling tube 8a is about 30 mm. In addition, the intake resonator 10 and the connecting pipe portion 8a communicate with each other by opening a hole (opening 10a) in the partition wall.
10a may be any position of the intake resonator 10, and both may be connected by a pipe. In this case, the pipe path is designed in a range of about 0 to 36 mm. Further, the throttle body 9 and the connecting pipe portion 8a form a linear passage, and the opening 10a may be arranged on the side surface of the throttle body 9.

As described above, the intake resonator is provided in the vacant space between the intake manifold 2 and the air cleaner 1.
By providing 10, a compact design can be achieved without increasing the installation space. In addition, air cleaner 1
By integrating the lower case 8 and the intake resonator 10 constituting the outer wall of the vehicle, the work of mounting the intake resonator 10 on the vehicle body assembling line at the factory can be eliminated, so that the number of parts is reduced, and retrofitting is eliminated. The assembly work cost can be reduced.

Further, by disposing the intake resonator 10 between the air cleaner 1 and the intake manifold 2, it is possible to prevent deterioration of intake noise caused by the following. That is, when the layout in which the air cleaner 1 is arranged on the intake manifold 2 is taken, the throttle body 9 is extended from the air cleaner 1 to the surge tank 5, and the length of the intake passage becomes about 70 to 200 mm. Therefore, intake noise of 250 to 350 Hz is generated due to intake pulsation.
Therefore, the volume of the intake resonator 10 is set to 200 to 400.
When set to cc, intake noise in the above frequency band can be reduced.

[0015]

The present invention is constructed as described above. By simply mounting the air cleaner on the intake manifold, the intake resonator integrated with the air cleaner can be provided inside the engine, and the number of assembly steps is reduced. The engine compartment can be reduced and the engine compartment can be made more compact. In addition, by arranging the air cleaner on the intake manifold, the throttle body is extended, and an intake resonator can be provided on the side of the throttle body. Therefore, a frequency band (250 to 350 Hz) which causes noise due to intake air is provided. Sound can be effectively reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of an intake pipe structure of an automobile engine according to the present invention.

FIG. 2 is a side view of an intake pipe structure of the vehicle engine shown in FIG.

FIG. 3 is a top view of an intake pipe structure of the automobile engine shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air cleaner 2 Intake manifold 8 Outer wall of air cleaner (lower case) 9 Throttle body 10 Intake resonator 10a Opening

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yasuhiro Koike 300, Takatsukacho, Hamamatsu-shi, Shizuoka Suzuki Co., Ltd.

Claims (2)

[Claims] 1. An intake pipe structure for an automobile engine, wherein an intake resonator is disposed along an outer wall of the air cleaner in an intake system in which the air cleaner and the intake manifold are connected via a throttle body. 2. The intake pipe structure for an automobile engine according to claim 1, wherein an opening of the intake resonator is provided near a connection point between an outer wall of the air cleaner and the throttle body.