JPS63289209A - Muffler - Google Patents

Abstract

PURPOSE:Tc aim at enhancing the cooling effect by providing an accelerating passage having a cross-sectional area which is smaller than that of a port connected to an exhaust pipe, in an exhaust gas passage in a body connected to the exhaust pipe, and by providing an introduction port upstream thereof or the like so as to accelerate exhaust gas to suck a gas stream. CONSTITUTION:A muffler has a port 6 connected to an exhaust pipe T at the front end of the body 5 thereof, and a sound suppresser 7 at the rear end of the same. Further, the suppresser 7 is composed of an inner cylinder 8 defining a main exhaust gas passage 1, a shielding cylinder 9 defining a bypass passage 11 and an outer cylinder 10. Further, the inner cylinder 8 is formed therein with several gas passages 12 communicating the bypass passage 11 with the main exhaust gas passage 1, and the outer cylinder 10 is formed therein with a heat radiation port 13. In this arrangement, a cylindrical body 3 communicated with an outside air introduction pipe 2 is laid at the center of the main exhaust gas passage 1, and an accelerating passage S is formed around the cylindrical body 3. Further, an exhaust gas stream flowing into the body 5 is accelerated through the accelerating passage S so that air in the cylindrical body 3 is sucked into a mixing chamber 4.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a muffler for an internal combustion engine.

(Prior Art) There are several types of conventional mufflers installed in exhaust pipes, but they are silencers and only cause a loss of output for the internal combustion engine.

(Technical Problem) An object of the present invention is to provide a muffler with a structure capable of accelerating the exhaust gas flow to create a vacuum state and thereby sucking the air flow.

(Technical Means) The present invention achieves the above object by providing an acceleration flow path having a smaller cross-sectional area than the connection port in the exhaust flow path of the main body connected to the exhaust pipe, and disposing an inlet port downstream or upstream of the acceleration flow path. This is a muffler.

(Embodiment) The illustrated embodiment is for a two-wheeled motor vehicle, and is attached to an exhaust pipe T from a gasoline engine E.

The device shown in Fig. 1 has a cylinder 3 connected to an inlet vibe 2 installed in the center of an exhaust flow path 1 of a muffler M, thereby creating a narrow acceleration flow path S between the inner wall of the flow path and the outer wall of the cooling cylinder. The outlet 3' of the cylindrical body 3 opens at the center of the exhaust gas flow, so that the stirring chamber 4 acts on the high temperature gas flow from the inside. 5
is the main body of [2, and 6 is a connection port with an exhaust pipe T connected to the front end thereof, which communicates with the exhaust flow path 1 at the center of the main body. The main body 5 has a muffler 7 connected to its rear end, which consists of an inner cylinder 8 forming a main exhaust flow path 1, a blocking cylinder 9 forming a side passage 11, and an outer cylinder 10. A large number of gas passages 12 that communicate the side passage 11 and the exhaust flow passage 1 are opened in the inner part n8, and a heat radiation port 13 is opened in the outer cylinder 10. Reference numerals 14 and 15 denote the front and rear cylinder bodies to which the outer cylinder is attached, and 16 denotes a side passage exhaust. 10 and 17 denote a porous exhaust port at the rear end of the exhaust passage, which has a hole member 18. Further, 19 indicates a member to which the cylindrical body 3 is fixed at the main body joint. Outside air is introduced into the introduction vibrator 2 directly from an outside air intake system 20 or indirectly through an oil cooler or the like.

According to the above configuration, the high temperature gas flow from the exhaust pipe T to the main body 5
solid line arrow), is accelerated by flowing through the circumferential accelerating flow path S of the cylinder 3, and exchanges heat with the low-temperature air flow inside the cylinder 3. The exhaust gas flow is accelerated in the accelerating flow path S, and acts from the outlet 3' of the cylinder 3 to suck the air inside the cylinder into the mixing chamber 4, so that the flow is accelerated in the direction from the inside of the introductory vibe 2 to the outlet 3'. Generates airflow towards. Note that the airflow is from the gas passage 12 to the side passage 1.
The sound is muffled by expanding and flowing out into the air outlet 1 and exiting through the porous exhaust hole 17.

In FIG. 5, a mixing chamber 22 for a high temperature gas flow and a cooling air flow is provided through a constriction part 21 on the upstream side of a small-diameter exhaust passage 1 near the connection port 6 of the main body 5, In this embodiment, the acceleration flow path S extends up to the inlet 1', and the discharge port 2' of the introducing vibe 2 opens into the acceleration flow path S. In this example, the inner cylinder 8 is provided in two layers, and the side passage 11 is also provided in two layers to reduce the resistance to passage of airflow, and to perform a noise reduction effect in two stages at the same location.

In the example of FIG. 5, there is no cylindrical body 3, and the configuration other than the above may be the same as that of FIG. 1, so the explanation of each part will be omitted by using the reference numerals.

(Operations and Effects of the Invention) Since the present invention is configured as described above, the exhaust gas flow discharged from the engine is accelerated in the acceleration flow path and creates a vacuum state. This produces the effect of suctioning the gas in the system that connects to the inlet. In other words, while conventional mufflers have no effective function other than silencing, the present invention constantly sucks airflow, such as outside air, from the inlet while the internal combustion engine is operating. This opens up the possibility of various uses. For example, in the most direct way, outside air is introduced and mixed with the exhaust gas, and then released into the atmosphere, making it possible to prevent thermal pollution. Furthermore, by connecting a pipe line to the inlet and sucking air acting on the radiator, oil cooler, intercooler, etc., the cooling effect on them is promoted.

In particular, the advantage of the present invention is that even when used in a stationary position such as construction equipment, a certain cooling effect can be obtained due to the above-mentioned constant suction action, and for internal combustion engines, it is possible to maintain a constant exhaust pressure and optimize exhaust efficiency. This contributes to smooth operation, reduces CO2 emissions, and eliminates the need for electric fans, which were previously required.

[Brief explanation of the drawing]

The first drawing shows the exhaust gas cooling device according to the present invention.
The figure is a longitudinal cross-sectional view of the first embodiment, Figure 2 is a cross-sectional view, Figure 3 is a rear view, Figure 4 is a side view showing an example installed on a two-wheeled vehicle, and Figure 5 is a cross-sectional view of the second embodiment. FIG. 3 is a side view of an example. S...Acceleration flow path, ■...Exhaust pipe, 1...Exhaust flow path, 2...Introduction pipe, 3...Cylinder body, 4...Exhaust port, 11...Side passage , 12... Gas passage. Patent application person corner 1) Yoshiaki 1.-1 Figure 1

Claims (1)

[Claims] A muffler in which an acceleration flow path with a cross-sectional area smaller than the connection port is provided in the exhaust flow path of the main body connected to the exhaust pipe, and an inlet port is provided downstream or upstream of the acceleration flow path.