JPH04163231A - Intake air noise reducing device for internal combustion engine - Google Patents

Abstract

PURPOSE:To improve on-vehicle mounting performance and assembling work performance by allowing the part, extended outside an engine room, of a cool air intake to pass through a single hole provided at a front apron or the like, and connecting this part to a resonator or the like installed outside the engine room. CONSTITUTION:A cool air intake 1' with an outside air inlet 1'a and an air cleaner end connection 1'b provided on both ends thereof is extended outside an engine room, and its part provided with the end connection 1'c of a resonator 3 is disposed between both above-mentioned openings 1'a, 1'b. One large hole 2'a opened at a front apron 2' is formed into such size as to enable the part, extended outside the engine room, of the cool air intake 1' to pass through from inside. The resonator 3 is disposed outside the engine room in order to improve vehicle mounting performance. Assembling work performance is thereby improved and intake air noise is reduced in addition to improving the on-vehicle mounting performance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an intake noise reduction device in which a resonator or the like is connected to a cool air intake for taking air into an internal combustion engine.

[Conventional technology]

In order to take outside air into the internal combustion engine, a cool air intake is provided, one end of which opens at a position where air can be taken in, and the other end of which communicates with an air cleaner. A resonator or the like is connected between both ends of the cool air intake in order to reduce intake noise. The resonator requires a certain size and takes up a lot of space when installed in the engine room.
It is also conceivable to arrange it outside the front apron as described in Japanese Patent No. -43170.

In that case, the cool air intake passes through the front apron from inside the engine room, is connected to the resonator outside the engine room, passes through the front apron again, returns to the engine room, and is connected to the air cleaner. ing. In this structure, as shown in FIG. 3, the cool air intake 1 has two parts extending inside the front apron (engine room side), namely, a part 1d having an air intake 1a.
and a portion 1e having a connection port 1b for the air cleaner, and a portion 1f extending outside the front apron 2 and having a connection port 1c for the resonator 3. Further, the front apron 2 is provided with two (1) holes 2'a and 2b, and the two portions 1d and le extending inside the front apron of the cool air intake are connected to these holes 2a, 2b. 2b, and are connected to the portion 1f extending to the outside of the front apron.

[Problem to be solved by the invention]

As mentioned above, the cool air intake is divided into three parts.
Assembling workability is poor, and since there are two connecting parts, sound leakage may occur due to poor connection between these parts, and there is a possibility that the reduction of outside air intake noise will be insufficient.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an intake noise reduction device for an internal combustion engine that is easy to mount on a vehicle, has good assembly workability, and improves reliability in reducing outside air intake noise.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention has a part extending inside the engine room, and a part extending outside the engine room having a connection port to a resonator etc. installed outside the engine room. A single hole is provided in a front apron or the like that partitions the inside and outside of the engine room so that the portion of the cool air intake extending outside the engine room penetrates through the cool air intake. An intake noise reduction device for an internal combustion engine is provided.

[For production]

The part of the integrated cool air intake that has a connection port to the resonator etc. and extends outside the engine room,
A single hole provided in the front apron or the like is penetrated from inside the engine room to connect the resonator or the like installed outside the engine room.

〔Example〕

In Fig. 1, 1' is a cool air intake formed integrally, 2' is a front apron which has one large hole 2/a and is one of the members that partition the inside and outside of the engine room, and 3 is a Helmholtz air intake. A resonator that reduces sound at a specific frequency by applying the principle of resonance.

The cool air intake 1' is the outside air intake 1'a
and an air cleaner connection port 1'b at both ends, and extends outside the engine room and connects to the connection port 1 of the resonator 3.
'c is provided between the outside air intake port 1'a and the air cleaner connection port 1'b.

One large hole 2/a provided in the front apron 2' is formed in a size that allows a portion of the cool air intake 1' extending outside the engine room to penetrate from the inside.

The resonator 3 is arranged outside the engine room to improve vehicle mountability.

FIG. 2 shows the arrangement of the cool air intake 1' and the air cleaner 4 in an automobile.

The intake noise reduction device of this embodiment is assembled as follows.

Referring to FIG. 4, a portion of the integrated cool air intake 1' having the resonator connection port 17c is passed through the hole 2/a of the front apron 2' and extended to the outside of the engine room. Next, the resonator 3 installed outside the engine room is connected to the resonator connection port 1'C. Also, the air cleaner connection port 1'b of the cool air intake 1' is connected to the air cleaner 4.

〔Effect of the invention〕

The intake noise reduction device for an internal combustion engine according to the present invention has a resonator etc. placed outside the engine room, making it easy to mount on a vehicle, and integrating a cool air intake improves assembly workability. Furthermore, by reducing the number of sealing parts, the reliability of reducing intake noise is improved.

Furthermore, integrating the cool air intake reduces the number of parts and reduces the cost of the cool air intake.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an intake noise reduction device for an internal combustion engine according to the present invention, FIG. 2 is a perspective view showing the arrangement of a cool air intake and an air cleaner in a vehicle, and FIG. 3 is a perspective view of a conventional intake noise reduction device for an internal combustion engine. Exploded view, FIG. 4 is an exploded view of the intake noise reduction device for an internal combustion engine according to the present invention. 1.1'...Cool air intake, 2,2'...
・Front apron, 3... Resonator.

Claims (1)

[Claims] It is equipped with a cool air intake in which a part that extends inside the engine room and a part that extends outside the engine room and have a connection port to a resonator etc. installed outside the engine room are integrally formed. , an air intake for an internal combustion engine, characterized in that a single hole is provided in a front apron or the like that partitions the inside and outside of the engine room so that the portion of the cool air intake extending outside the engine room penetrates. Sound reduction device.