JPS6327061Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a joint for tuned silencers.

In general, model engines are mainly two-stroke small engines, and the exhaust noise produced by high-speed rotation is extremely harsh and high-pitched, so they are designed to accurately eliminate the harsh high-pitched sounds and maintain or increase the speed of the engine. Tuned silencers have been put into practical use.

FIG. 1 is a plan view showing the installed state of a tuned silencer according to a conventional example, in which an adapter 3 is fixed to an exhaust port 2 of a model engine 1;
A tuned silencer 4 is connected via a joint 5.

However, as shown in FIG. 2, the conventional joint 5 uses a heat-resistant tube containing silicone, etc., and the engine 1 side adapter 3,
Although the pipe end of the tuned silencer 4 is fitted and connected, there were problems with heat resistance and durability.

This idea was made to improve the drawbacks of the conventional structure mentioned above, and it improves the heat dissipation effect and heat resistance effect of the joint used to connect the engine side and tuned silencer, and also improves the ease of installation and removal work. It consists of a joint body molded from heat-resistant silicone rubber and a metal plate, and the joint body is integrally provided with a plurality of cooling fin-like reinforcing rings along the circumferential direction in the center of the joint body. At the same time, a thin wall portion is formed in which the inner diameter including the reinforcing ring up to the vicinity of both ends is larger than the inner diameter of both ends, into which the metal plate is fitted, and the metal plate is opened in the length direction and rounded. An object of the present invention is to provide a joint for a tuned silencer formed into a cylindrical shape.

Hereinafter, this invention will be described in detail based on the accompanying drawings showing embodiments thereof.

FIG. 3 is a front view of the tuned silencer joint 10 according to this invention, and FIG. 4 is a top sectional view.

The joint 10 is made up of a joint body 11 made of heat-resistant silicone rubber, and a metal plate 12 made of a phosphor bronze plate, a stainless steel plate, etc. that is closely fitted to the inner diameter side of the joint body 11.

The joint main body 11 is integrally provided with a plurality of reinforcing rings 11a in the form of cooling fins along the circumferential direction in the center, and the inner diameter D including the reinforcing rings 11a up to the vicinity of both ends is larger than the inner diameter d of both ends. The reinforcing ring 11a has a thin wall portion 11b. The number of reinforcing rings is generally 5 or 6.

A metal plate 12 is closely fitted into the inner diameter D of the thin wall portion 11b of the joint main body 11, and this metal plate 12 has high elasticity, heat resistance, and thermal conductivity as shown in FIG. It is formed into a cylindrical shape that is open in the length direction and is inset with a phosphor bronze plate or stainless steel plate, etc., which has excellent properties. It is attached closely to D, and the inner diameter is almost the same as the cylindrical surface.

Next, the usage state of the joint 10 consisting of the joint main body 11 and the metal plate 12 configured as described above will be explained. FIG. 6 is a front view of this device in use, and FIG. 7 is a sectional view showing the main parts of FIG. are inserted from both end surfaces of the joint body 11,
It is inserted into the inner diameter side of a metal plate 12 that is fitted in advance to the inner diameter of the joint body 11. Thereafter, both sides of the joint body 11 are tightened with tube bands 13, an example of which is shown in FIG.
and the tube end portions 3a, 4a on both sides are closely connected to each other.

As described above in detail, the tuned silencer joint according to this invention is characterized by the above-mentioned configuration, and has the following effects.

Due to the airtightness of the silicone rubber and the heat resistance and thermal conductivity of the metal plate, the joint body has good heat resistance and durability, and the cooling fin-like reinforcing ring improves the heat dissipation effect.

The reinforcing ring installed in the center of the joint body allows for easy attachment and removal without your fingers slipping when attaching and detaching from the tube end.It also serves as a scale to determine the insertion length of the tube end, making it easy to determine the tube band attachment position. It is decided.

The high temperature on the engine side is easily conducted to the silencer side through the metal plate, and the metal plate protects the silicone rubber, resulting in an extremely significant cooling and heat dissipation effect.

Although the joint for a tuned silencer according to this invention has been explained mainly as a joint used for a joining part of a tuned silencer for a model engine, it is not limited to this.
The invention may also be applied to other exhaust pipe joints without departing from the spirit of the invention.

[Brief explanation of drawings]

Fig. 1 is a plan view showing a conventional tuned silencer installed, Fig. 2 is a perspective view of the joint showing an exploded main part of Fig. 1, and Fig. 3 is an embodiment according to this invention. Figure 4 is a cross-sectional view of Figure 3, Figure 5 is a perspective view of a metal plate that is one of the components, Figure 6 is a front view of the joint according to this invention, showing how it is used. figure,
FIG. 7 is an enlarged sectional view showing the main part of FIG. 6, and FIG. 8 is a perspective view showing an example of the tube band. 10...Joint, 11...Joint body, 11a...Reinforcement ring, 11b...Thin wall portion, 12
...Metal plate, 13...Tube band.

Claims (1)

[Claims for Utility Model Registration] (1) Consisting of a joint main body made of heat-resistant silicone rubber and a metal plate, the joint main body has a plurality of cooling fin-like reinforcing rings integrated in the center along the circumferential direction. In addition, a thin wall portion is formed in which the inner diameter including the reinforcing ring up to the vicinity of both ends is larger than the inner diameter of both ends, into which the metal plate is fitted, and the metal plate is open in the length direction. A joint for a tuned silencer characterized by being formed into a rounded cylindrical shape. (2) The joint for a tuned silencer according to claim 1, wherein the metal plate is a phosphor bronze plate or a stainless steel plate.