JPS6341570Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an intake resonator installed in the intake system of an automobile.

[Prior art]

BACKGROUND ART Conventionally, an intake resonator (resonator) has been attached to an intake system communicating with an engine of an automobile in order to reduce intake noise caused by intake pulsation or the like. Here, the resonator refers to a muffler that applies the principle of Helmholtz resonance to reduce sounds such as exhaust noise and intake noise at a specific frequency.

Such an intake resonator has conventionally been developed, for example, by
As shown in Japanese Patent Publication No. 8346, it is provided in the middle of the intake passage leading to the air cleaner, or it is provided in the middle of the air cleaner to the intake manifold. Further, a plurality of intake resonators may be attached to the intake system.

By the way, when the intake resonator is installed in the conventional position, the intake resonator requires a certain capacity in order to obtain the effect of reducing intake sound due to resonance. For this reason, this intake resonator often gets in the way when replacing or servicing other parts in the engine room, which poses a problem of impairing the workability of parts replacement or maintenance. Furthermore, consideration of this workability is a major constraint in design. Therefore, it has been desired to effectively utilize the space within the engine room.

[Purpose of invention]

This invention was developed based on the requests for this invention, and by effectively utilizing the space between each branch pipe of the intake manifold, which was conventionally a dead space, it is possible to secure work space in the engine room and free up the space for installing the intake resonator. The purpose is to ensure that

[Structure of the idea]

According to the present invention, this object is an intake resonator that is attached to an intake manifold of an automobile to reduce intake noise, which comprises: a box body provided so as to surround each branch pipe of the intake manifold; This is achieved by an intake resonator characterized by having a communication pipe connecting the box body and the intake manifold.

In the present invention, the size of the box provided to surround each branch pipe of the intake manifold,
The diameter, length, etc. of the communication pipe are automatically determined depending on where the specific frequency to be reduced is set. At this time, the space defined by the inner surface of the box and the outer surface of the intake manifold becomes the capacity of the intake resonator.

The intake resonator according to the present invention can be made of a light alloy such as an aluminum alloy, but it can be made of plastic to reduce its weight. It is convenient to make this intake resonator in two parts and join them together with the intake manifold sandwiched between them.

[Function and effect of the idea]

As described above, according to the present invention, the following effects are achieved.

(a) According to the present invention, the space between the branch pipes of the intake manifold, which was conventionally a dead space, is used as the capacity (resonance chamber) of the intake resonator. A work space can be secured for parts replacement and maintenance. This increases the degree of freedom in design.

(b) In order for the intake resonator to block the side radiation heat from the exhaust manifold and manifold converter located below the intake manifold, a heat insulator is separately installed between the intake manifold and the exhaust manifold,
There is no need to provide fins on the intake manifold to improve heat dissipation.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment) FIG. 1 is a perspective view showing an intake resonator according to a first embodiment of the present invention, and FIG.
It is a graph showing the intake noise reduction effect when the intake resonator according to the example is attached.

In Fig. 1, 1 is an intake manifold for a four-cylinder engine, and this intake manifold 1 includes four branch pipes 2, a gathering part 3 of the branch pipes 2, and a mounting flange 4 to the cylinder block of the engine. Consisting of A box body 5 made of plastic is attached to the branch pipes 2 so as to cover the periphery of the four branch pipes 2.
and the gathering part 3 of the intake manifold 1 is the communication pipe 6
It is communicated by. The box body 5 and the communication pipe 6 form an intake resonator.

In this embodiment, the intake noise of a specific frequency of the mixed gas sucked into the intake manifold is significantly reduced by the principle of Helmholtzno resonance. FIG. 2 shows this state graphically. As is clear from FIG. 2, when an intake resonator is attached to the intake manifold as in this embodiment, intake noise is significantly reduced compared to when no intake resonator is attached.

Furthermore, in this embodiment, since the intake resonator is attached to surround each branch pipe of the intake manifold, the space between the branch pipes, which was conventionally a dead space, can be used effectively, and the parts can be separated. Work space is secured during replacement and maintenance, improving work efficiency.

Further, the intake resonator of this embodiment acts as a heat insulating member and blocks radiant heat from an exhaust manifold and the like provided below the intake manifold to the intake manifold. For this reason, as in the past, a separate insulator is provided,
There is no need to provide heat dissipation fins on the intake manifold, reducing the number of parts and simplifying the structure of the intake manifold.

(Second Embodiment) FIG. 3 is a plan view showing an intake resonator according to a second embodiment of the present invention.

In FIG. 3, parts or portions that are substantially the same as those in the first embodiment are designated by the same reference numerals as in the first embodiment, and a description thereof will be omitted.

The second embodiment differs from the first embodiment only in the way in which the communicating pipes are provided between the intake manifold 1 and the box body 5. In the second embodiment, the communicating pipes 2 are attached not to the collecting portion 3 of the intake manifold 1 but to each of the four branch portions 2, and communicate with the inside of the box body 5.

The second embodiment also provides the same effects as the first embodiment.

Although a specific embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and includes various embodiments within the scope of the claims for utility model registration. For example, in the first and second embodiments, an example was shown in which the intake resonator was attached to an intake manifold for a 4-cylinder engine, but it can be similarly attached to an intake manifold for a 6-cylinder engine, etc.

Further, in the first embodiment and the second embodiment, an example of an intake resonator that covers all between the four branches is shown, but two intake resonators can also be attached so as to cover two of each branch.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the intake resonator according to the first embodiment of the present invention, FIG. 2 is a graph showing the intake noise reduction effect when the intake resonator according to the first embodiment of the present invention is installed, and FIG. The figure is a plan view showing an intake resonator according to a second embodiment of the present invention. 1... Intake manifold, 2... Intake manifold branch pipe, 3... Intake manifold collecting pipe, 4... Intake manifold mounting flange, (5... box body, 6... communicating pipe) intake resonator.

Claims (1)

[Scope of Claim for Utility Model Registration] An intake resonator that is attached to an intake manifold of an automobile to reduce intake noise, comprising a box body provided to surround each branch pipe of the intake manifold, and this box body. and a communication pipe connecting an intake manifold.