JP3040200U - Car silencer - Google Patents

Abstract

(57) Abstract: In a muffler for an automobile, the structure of an exhaust pipe that forms an exhaust passage of exhaust gas is improved so that the exhaust passage becomes longer and exhaust gas flowing through the exhaust passage is reduced. By forming it to rotate in the direction of flow, the exhaust and noise reduction effects are increased. SOLUTION: A straight pipe exhaust pipe is processed into a spiral shape, arranged inside an outer cylinder which is a main body of a silencer for an automobile, and formed as an exhaust gas exhaust path.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a muffler for an automobile that efficiently muffles exhaust gas in an exhaust passage formed by a spirally wound exhaust pipe.

[0002]

[Prior art]

 According to the conventional technique, for example, a straight exhaust pipe is arranged along the flow direction of exhaust gas in an outer cylinder forming the main body of a vehicle silencer, and a large number of exhaust pipes are provided on the peripheral surface of the exhaust pipe. In order to improve the effect of diffusing and contracting the exhaust gas that flows through the exhaust passage formed by forming the small holes in the exhaust pipe, the small holes on the exhaust pipe peripheral surface face the flow on the upstream side of the exhaust gas and flow on the downstream side. A large number of small holes, such as the device disclosed in Japanese Utility Model Publication No. 55-176424 and the device (utility model registration number 1830797) that increases the flow velocity of exhaust gas flowing through the exhaust pipe by forming a notch along the By forming the rear end of the straight exhaust pipe with a smaller diameter than the front end and connecting exhaust pipes of the same structure in series to form a narrow and wide exhaust passage, The exhaust gas flowing through the passage is throttled and the intake or exhaust noise is Muffler weakened layer is provided.

As described above, the method for forming the small holes on the peripheral surface of the exhaust pipe is improved to increase the flow velocity of the exhaust gas flowing through the exhaust pipe to improve the efficiency of the exhaust action, and The idea of improving the sound deadening effect by contracting and expanding the exhaust pipe flowing through the exhaust pipe by reducing the diameter is the same as the purpose of improving the exhaust gas exhausting the sound exhaust pipe Discloses the method of improving the structure of the exhaust pipe.

[0004]

[Problems to be solved by the device]

 In the above-mentioned conventional technique, there is an effect of improving the method of forming the exhaust hole on the peripheral surface of the exhaust pipe and thereby enhancing the exhaust and muffling effect of the exhaust gas. It is important to form the exhaust passage of the exhaust pipe related to these functions to be longer under certain conditions, but its length is limited by the length of the straight pipe processed into the exhaust pipe. It Also, connecting the exhaust pipes in series in order to narrow the diameter of the exhaust pipe and form a narrowing or widening in the exhaust passage to increase the sound deadening effect complicates the manufacturing process and makes the silencer compact and It becomes a factor that prevents lowering the cost.

[0005]

[Means for Solving the Problems]

 The muffler for an automobile according to the present invention is characterized in that the structure of the exhaust pipe forming the exhaust passage of the exhaust gas in the outer cylinder forming the main body of the muffler is formed into a spiral shape.

[0006]

[Embodiment of the invention]

 The silencer for an automobile according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a side elevational view of a muffler for an automobile according to the present invention, FIG. 2 is a side view of an exhaust pipe processed into a spiral shape, and FIG. 3 is a sectional view taken along line AA of FIG. FIG. 4 is a side elevational view of a conventional silencer.

In each drawing, 1 is an outer cylinder forming the main body of a silencer, 2 is an exhaust pipe processed into a spiral shape, 3 is an exhaust inlet, 4 is an exhaust outlet, 5 is a large number of small holes, 6 Is a main exhaust passage in the exhaust pipe, 7 is a muffling chamber, and 8 is a straight exhaust pipe.

As shown in FIGS. 1 and 2, the exhaust pipe 2 forming the main exhaust passage 6 in the outer cylinder 1 has a structure in which a straight exhaust pipe is processed into a spiral shape. There is.

Exhaust gas from the engine vigorously flows into the exhaust pipe 2 from the exhaust introduction port 3, flows along the exhaust passage 6 while rotating along the inner wall surface of the spirally processed exhaust pipe 2, Through this rotational movement, the flow velocity and pressure are increased, and the noise is efficiently silenced, and the sound is exhausted from the exhaust gas exhaust port 4 into the atmosphere.

As described above, since the exhaust pipe 2 is processed into a spiral shape, as compared with the exhaust pipe 8 which is a conventional straight pipe, the portion where the small hole 5 is formed in its peripheral surface (that is, the exhaust pipe 2). The length of the portion of the exhaust passage 6 that increases the exhaust and noise reduction effect is formed to be longer, and the exhaust and noise reduction efficiency is increased by that much as compared with the straight exhaust pipe 8.

The exhaust gas flowing from the engine into the exhaust pipe 2 through the exhaust introduction port 3 diffuses and expands, and in the process of flowing through the exhaust pipe 2, the inner wall surface of the exhaust pipe 2 processed into a spiral shape. The flow velocity and the pressure are increased while rotating along with, and jetted out into the muffling chamber 7 through a large number of small holes 5 formed in the peripheral surface of the exhaust pipe 2.

Exhaust gas that has flowed into the muffling chamber 7 through the small holes 5 formed in the peripheral surface of the exhaust pipe 2 is silenced in the muffling chamber 7, and is exhausted as described above. As the flow velocity and the pressure change, they flow back to the exhaust pipe 2 and are discharged from the exhaust discharge port 4 into the atmosphere. In this case, it is preferable to fill the sound deadening chamber 7 with a sound absorbing material.

Further, as another embodiment not shown, a plurality of spirally processed exhaust pipes 2 according to the present invention are arranged in parallel in the outer cylinder 1, and the exhaust introduction port 3 is introduced into the outer cylinder 1. A plurality of exhaust passages for the inflowing exhaust gas may be formed.

[0015]

[Effect of the invention]

 As described in detail above, the present invention has the structure of an exhaust pipe forming an exhaust passage for exhaust gas in an outer cylinder forming a main body of a vehicle silencer, in which a straight exhaust pipe is processed into a spiral shape. In this way, the exhaust gas flowing out from the engine into the exhaust pipe vigorously flows and flows along the inner wall surface of the spirally processed exhaust pipe. In addition, the exhaust system configured inside the outer cylinder has the effect of efficiently exhausting and silencing. Furthermore, since the exhaust pipe is processed into a spiral shape, compared to the conventional straight exhaust pipe, the length of the wall surface where the exhaust hole is provided (that is, the length of the exhaust passage that improves the exhaust and noise reduction effect). The length of the exhaust pipe is longer, which has the effect of improving the sound deadening efficiency more than that of a straight pipe, and the structure of the exhaust pipe is simple, and a compact silencer can be provided.

[Brief description of the drawings]

[Fig. 1] Side view of a muffler for automobiles

[Fig. 2] Side view of the exhaust pipe

FIG. 3 is a sectional view of a portion AA in FIG.

FIG. 4 is a vertical side view of a conventional silencer.

[Explanation of symbols]

In each figure, 1 is an outer cylinder, 2 is an exhaust pipe, 3 is an exhaust inlet, 4 is an exhaust outlet, 5 is a large number of small holes, 6 is an exhaust passage,
7 is a muffling room, 8 is a straight exhaust pipe.

Claims (1)

[Utility model registration claims] 1. An outer cylinder constituting a main body of a silencer for an automobile,
Inside the outer cylinder, it is arranged along the flow direction of the exhaust gas,
It consists of an exhaust pipe having a large number of small holes formed in its peripheral surface, and an exhaust inlet and an exhaust outlet formed by penetrating the side walls of the outer cylinder on the upstream and downstream sides of the flow of exhaust gas. A silencer for an automobile, characterized in that the structure of the exhaust pipe is formed into a spiral shape.