JPS5949361A - Air-intake silencer in internal-combustion engine - Google Patents

Abstract

PURPOSE:To form an intake-air silencer of a compact size, by forming noise suppressing resonator chambers surrounded with walls which are integrally incorporated with a manifold, in spaces between air-intake passages. CONSTITUTION:Noise suppressing chambers 10a through 10c which are integrally incorporated with an intake-air manifold 3, are formed in positions corresponding to spaces between intake-air passages 4a through 4d, and are fabricated such that the outer walls of each adjacent air-intake passages and the outer walls of a distributing chamber 5 are commonly used as the walls of each resonator chamber 10a through 10c, and are integrally incorporated with upper and lower walls 11a, 11b. A tubular member 13 is disposed in a hole 12 formed in the partition wall 5a between the distributing chamber 5a and each noise suppressing resonator chamber 10a through 10c. The respective noise suppressing resonator chambers 10a through 10c are communicated through the tubular members 13 with the distributing chamber 5 so that the noise suppressing resonator chambers 10a through 10c effectively damp intake-air noise having a predetermined frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intake f sound monitoring device for a multi-cylinder internal combustion engine.Recently, there has been a strong demand for silencing of intake noise in addition to exhaust sound scales. ing. Countermeasures against noise in the intake system
Many proposals have been made, such as adding a white-sounding resonance chamber or adding a multitone function. However, such conventional structures do not only result in an increase in the number of parts, but also require a particularly large base for noise countermeasures. There were some problems such as.

The present invention has been made based on these requirements, and an object of the present invention is to provide an intake silencer for an internal combustion engine that does not require a special space and can be implemented with a small number of parts.

That is, the present invention focuses on the fact that a space is formed between each intake passage in the intake manifold.

The space part (2) is characterized in that a silencing resonance chamber is formed integrally with the manifold.

The details of the present invention will be explained below based on the drawings.

FIG. 1 shows an intake system diagram of a conventional multi-cylinder internal combustion engine, which is formed in a cylinder block l. For example, intake passages 4a to 4d of the intake manifold 3 are connected to the four cylinders 2a to 2d, respectively. Intake] [Road 1 4a
~4d are separated into loaves], and the ends of these earthflows are collected in the distribution chamber 5. The distribution chamber 5 is connected to an air cleaner 7 (as known in the art) via an intake pipe 6.

The intake manifold F3 includes the above-mentioned intake introduction pipe 61 distribution chamber 5 and the above-mentioned intake passages 4a to 4d branched from this distribution chamber 5.
In the conventional intake manifold 3 described above, each intake passage 4
Spaces 8a, 8b and 8C are formed between a to 4d.

The present invention provides air space Iij portions 83 to 83 between the intake passages 43 to 4d.
8C is effectively used to form a silencing resonance chamber in the spaces 8a to 8C.

That is, one embodiment of the present invention follows the path shown in FIG. These silencing resonance chambers 1oa-toc are formed.

The outer wall of the intake passage and the outer wall of the distribution chamber 5 which are in instant contact are shared as a common wall, and in addition to these walls C, the upper wall 11a and the lower wall J7b shown in the second factor are integrally molded. ◎A through hole 12 is opened in the boundary wall 5a between the silencing resonance chamber toa-toc and the distribution chamber 5.
A tubular member 3 shown in FIG. 4 is accommodated in this through hole 12. The tubular member 13 is made of an elastic material such as rubber, and has a fitting groove t on the outer peripheral surface of the intermediate portion along the axis.
The groove width of the opening fitting groove 13B in which Sa is formed is formed to be slightly narrower than the thickness of the boundary wall 5a, and the tubular member 13 is pushed through the through hole 12≦2 and the fitting is completed. By fitting the groove 13B into the through hole 12, the tubular member 13 is fixed to the boundary wall 5a. The tubular member 13 has a through hole 12 formed by a pigsty groove 13a.
However, the distribution chamber 5 is sealed by the internal communication hole 13b.
and the silencing resonance chamber are communicated with each other.

The open end of each silencing resonance chamber J (7a to IOC) is connected to the flange portions 148 to 14d formed in each intake passage 4a to 4d.
) is also recessed on the distribution chamber 5 side.

These opening ends are cap members 15a to isc, respectively.
1) occluded by (tsc not shown in Figure 1).

The cap member tsa-t5c is metal.

It may be made of any material such as rubber or synthetic resin, and adhesive,
The intake manifold 3 having such a structure is airtightly sealed by an appropriate means such as screwing, caulking, or welding. ), the cylinder block 7+2 can be determined in the same way as in the past.

According to such a structure of the present invention, each silencing resonance chamber 10
a-10c is communicated with the distribution chamber 5 via the tubular member 13..., so these silencing chambers 70a-10C
Since the non-embodiment is a four-cylinder internal combustion engine, three silencing resonance chambers 10a-10C can be configured, and for a desired silencing frequency, By forming the volumes of the resonance chambers 10a to IOC, the diameter of the communication hole 13b of the tubular member 13, the length of the tubular member 13, etc. to the same dimensions, all the resonance chambers 10a to 10c have a damping effect for a constant frequency. Because it causes.

A significant silencing effect can be obtained compared to the case of one resonance chamber.

Further, the volume of each resonance chamber JOB-1D, the diameter of each communication hole 1.9b of the tubular member 13, the length of the tubular member 13, etc. may be configured to be different from each other.

Each resonant chamber has a different silencing frequency, at least 3
You can expect a damping and silencing effect for the different frequencies.

Therefore, it is possible to respond to a wide range of frequencies according to the intake noise of an internal combustion engine. Note that the tubular member 13 is not necessarily made of an elastic material such as rubber, but may be made of a metal material, and in some cases, a tubular 8IS material may be used. It is not necessary to use wood.

As described in detail above, the present invention forms a silencing resonance chamber in the space formed between the intake passages in the intake manifold, which is surrounded by a wall that is integrally formed with the ulcer manifold, so that the space is effective. This eliminates the need for a special space for a resonance chamber, and the number of parts is reduced because the resonance chamber is integrally molded with the manifold.For this reason, the intake silencer is compactly constructed and reduces intake noise. 0, which is effective in reducing

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an intake system of a conventional multi-cylinder internal combustion engine, and Fig. 2 is an intake system showing an embodiment of the present invention. Perspective view of the manifold. Figure 3 shows its cross section. The younger brother figure 4 is a perspective view of the tubular member □2a to 2d...
·cylinder. , q...Intake manifold. 48-4d...Intake passage. 5...Distribution room, Ha~8
C... Space part, ioa-toc... Sound deadening resonance chamber, l
3... Tubular member, J5a-15G... Cap member. Applicant's agent: Patent attorney Dosu Hiko 7- Hiko 1 Figure 1 IrP 2 Figure 3

Claims (1)

[Claims] In an intake manifold integrally equipped with a distribution chamber and a plurality of bulky independent intake passages branching from the distribution chamber and communicating with each cylinder, a space between the intake passages (2) is formed integrally with the manifold. An intake muffling device for an internal combustion engine, characterized in that a muffling resonance chamber is formed surrounded by a molded wall.