JPS636452Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an intake silencer made of synthetic resin, in particular an intake silencer in which a capacitor part and a pipe part are constructed by blow molding, and these parts are assembled by a simple method. It provides equipment.

Intake noise includes pulsating noise accompanying the opening and closing of the intake valve, and airflow noise due to turbulence in the intake flow.
The main components are sounds in the low frequency range of the second, second and third order components, and in automobiles, it is necessary to eliminate this intake noise in order to provide a quiet engine.

Intake silencers are used to reduce this intake noise, but since the intake air temperature is low, it is possible to use metal silencers or synthetic resin ones. By using synthetic resin instead of plastic, weight can be reduced, which in turn helps improve fuel efficiency.

There are various types of intake silencers, such as a resonance type, an expansion type, a sound absorption type, an interference type, and a resistance type, and the present invention relates to a resonance type intake silencer.

A conventional intake silencer made of synthetic resin is assembled by molding a capacity part and a pipe part each into two parts (usually divided into two parts in the length direction) using an injection molding method. When using the injection molding method, two types of molds, a male mold and a female mold, are required, and it is necessary to divide the molded product into two parts as described above from the viewpoint of the process. Further, according to the injection molding method, it is difficult to manufacture a product having an undercut, and there are cases where it is impossible to mold a product having a shape suitable for an intake silencer.

Furthermore, when molding the capacitor and the pipe by injection molding, both a male mold and a female mold are required, and the molded parts are held in two by metal clips. It is used and assembled. Therefore, as long as injection molding is used, both male and female molds are required, and the assembly process is complicated.
The disadvantage of being disadvantageous in terms of cost cannot be avoided.

Furthermore, when using a metal plate, 2.
The number of molds increases due to the division, and welding and caulking methods are used for assembly, which makes it difficult to mass produce and is disadvantageous in terms of weight.

The purpose of the present invention is to eliminate the drawbacks of the conventional resonance type intake silencer, and to achieve this purpose, the capacity part and the pipe part are formed by synthetic resin blow molding. A ring made of an elastic material such as rubber is provided at the connection part between the capacitor part and the pipe part, and this ring provides a seal between the two parts. be.

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

FIG. 1 is a perspective view of a resonance type intake silencer.
A resonant chamber is constructed by fitting the two.

The capacitor part 2 has the structure shown in FIG. 2 and is obtained by blow molding synthetic resin, and a fitting part 4 and an air discharge part 5 are provided at one end of the capacitor part 2, respectively. A plurality of box-shaped resonance parts 6 are formed in the vicinity of the fitting part 4 in a protruding state.

FIG. 3 is a perspective view of the pipe section 3, which is composed of an air supply port 7 connected to an air filter and a cylindrical section 8 inserted into the capacity section 2.
A plurality of holes 9 are provided at appropriate locations, and when the cylindrical body part 8 and the capacitor part 2 are assembled, the holes 9 are opened into the resonance part 6 of the capacitor part 2. is formed.

FIG. 4 shows the structure of the seal part A provided on the pipe part 3 of FIG. It is composed of an elastic ring 11 made of rubber or the like fitted into the ring.

FIG. 5 is a sectional view showing the main parts of the intake silencer according to the present invention in an assembled state, and the capacity part 2 is drawn in a different shape from that of FIG. 2.

In this assembled state, the capacitor part 2 in FIG.
The cylindrical body part 8 shown in FIG. 3 is inserted into the fitting part 4 provided in the pipe part 3 to be assembled.
a, 2b, and the elastic rings 11 are sealed by pressing the inner surfaces of the tubular parts 2a, 2b. Therefore, the resonance part 6 of the capacitive part 2 is located around the cylindrical part 8, and the cylindrical part 8 and the resonance part 6 are communicated through the hole 9 provided in the cylindrical part 8. Become.

Now, in the blow molding method for synthetic resins, a molten resin cylinder is extruded from a molding machine into a divided mold (outer mold), and the lower end of this cylinder is pressed by the mold. The cylindrical body is sealed, compressed air is supplied to the inside of the cylindrical body to expand the cylindrical body, and a softened synthetic resin plate is pressed against the wall of a cavity formed in a mold. Therefore, according to this molding method, the mold can be molded only with the outer mold,
Even molded products that cause undercuts can be easily molded, and productivity is extremely high.

The present invention skillfully utilizes the advantages of the synthetic resin blow molding method, and even complex shapes as shown in Figures 1 to 4 can be easily molded using only an outer mold. It is possible to do so.

Furthermore, the present invention is characterized in that it employs a structure that can be sealed by simply fitting together when assembling the intake silencer.

Specifically, as shown in FIG.
0, and an elastic ring 11 made of rubber or the like is fitted as a sealing material into the groove formed between the protrusions 10, 10.

Therefore, as shown in FIG.
By fitting the capacitor part 2 into the part, the space between the two is sealed by the elastic ring 11.
Seal is relatively easy.

In addition, in the sealing part, the elastic ring 11 is connected to the capacitor part 2.
Since the assembly is performed while pressing the insides of the tubular portions 2a and 2b, this assembly operation is significantly simpler than conventional methods.

In particular, the intake silencer according to the present invention is only divided into two parts, the pipe part 3 and the capacitor part 2, so unlike the conventional device, the pipe part and the capacitor part are divided into two parts in the length direction. There is no need to divide it into parts and assemble them.

As described above, the present invention uses synthetic resin blow-molded parts for the intake silencer members, so even complex shapes can be molded simply by using an outer mold.

Further, the intake silencer according to the present invention is composed of a capacitive part that constitutes a resonator and a pipe part that is fitted into this capacitive part, and a ring-shaped protrusion is provided on the pipe part that is the part that fits into the two parts. Sealing can be easily achieved by inserting an elastic ring into the groove formed between the two rows of protrusions and sealing the elastic ring under pressure when assembling the muffler.

In the present invention, since a synthetic resin blow molding method is adopted, even a device having an undercut can be easily manufactured, so that a device having an optimal shape can be designed and manufactured.

Furthermore, in the present invention, since only the outer mold needs to be prepared, at least the production cost of the mold can be reduced, and the cost and weight of the intake silencer for automobiles can be reduced. It is possible to reduce the weight of automobiles.

In addition, although the resonance part 6 is formed in a box shape in FIGS. 2 and 3, as shown in FIG. The shape and structure of each part of the muffler can be appropriately determined depending on the amount of air to be processed, the size of the engine, etc.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a perspective view of an example of an intake silencer, Fig. 2 is a perspective view of a capacity section constituting the intake silencer, and Fig. 3 is a perspective view of a pipe section. , FIG. 4 is a sectional view of a seal part provided in a pipe part, FIG. 5 is an explanatory diagram showing an assembled state of the capacitor part and pipe part, and FIG. 6 is a main part of an intake silencer according to another embodiment. FIG. 1... Intake silencer, 2... Capacity part, 2a, 2b
...Tubular part, 3...Pipe part, 4...Fitting part, 5
...Discharge section, 6... Resonance section, 7... Supply port, 8...
... Cylinder body part, 9 ... Hole, 10 ... Projection, 11 ... Elastic ring.

Claims (1)

[Scope of utility model registration request] It consists of a capacitor part having a resonance part molded by synthetic resin blow molding, and a pipe part that fits into the fitting part of this capacitor part.An elastic ring is fixed to the pipe part, and the capacitor is connected through this elastic ring. An intake silencer characterized by assembling a section and a pipe section in a sealed state.