JP2016217174A - Muffler of automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a muffler capable of attaining a sufficient function with a simple structure.SOLUTION: In a silence effect cylinder 12, pressure of exhaust gas flow (a) generated by the engine 6 becomes higher as the inner diameter of a narrowed pipe part 12B is made gradually smaller, and thereby torque efficiency of the engine 6 is improved. Also, by discharging gas flow (a1) having passed the narrowed pipe part 12B from an exhaust gas discharge hole 12A2X through a gas rectification part 12A1 and a gas discharge part 12A2 provided so as to be adjacent to each other, pressure of exhaust gas is reduced, and thereby exhaust noise of exhaust gas can be effectively muffled with a simple structure, while improving torque efficiency.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an automobile muffler, and more particularly, to improve engine output together with engine exhaust noise.

  2. Description of the Related Art Conventionally, various muffler devices have been proposed as silencers for connecting a muffler effect pipe having a large number of exhaust holes as a muffler to an engine exhaust pipe in order to obtain a muffler effect of an exhaust sound of an automobile such as a motorcycle. (For example, refer to Patent Documents 1 and 2).

JP 2010-31852 A JP2013-204515A

  However, the silencer effect pipes that have been used in the past have a complicated structure up to obtaining a silencer effect by passing exhaust gas exhausted from the engine through a large number of ventilation holes. It is desirable to obtain a sufficient silencing and output improvement effect.

  The present invention has been made in consideration of the above points, and an object of the present invention is to propose a silencer having a simple configuration capable of obtaining an engine output improvement effect together with engine exhaust noise in practical use.

  In order to solve such a problem, in the present invention, the silencer 1 of the automobile 2 is provided on the downstream side of the exhaust pipe 8 of the engine 6 and has a silencer effect cylinder 12 made of a cylindrical material, The effect cylinder 12 receives the exhaust gas flow sent from the exhaust pipe 8 of the engine 6 at the upstream end and sends it to the downstream end, and the exhaust gas flow sent from the throttle pipe part 12B. Has a gas rectifier 12A1 that receives the gas at the upstream end and sends it to the downstream end, and a gas discharger 12A2 that receives the exhaust gas flow sent from the gas rectifier 12A1 at the upstream end and sends it toward the downstream end. The throttle tube portion 12B is configured to reduce the pressure of the exhaust gas flow entering the inner diameter by decreasing the size of the inner diameter of the cylindrical material in the direction of sending the exhaust gas flow from the upstream end to the downstream end. Gas rectification unit 1 The upstream end of A1 has an inner diameter that is the same as the inner diameter of the downstream end of the throttle tube portion 12B, and is cylindrical in the direction of sending the exhaust gas flow received at the upstream end toward the downstream end. By maintaining the same inner diameter of the body material, the fluctuation of the pressure of the exhaust gas flow passing through the inner diameter is suppressed, and the gas discharge part is plugged from the upstream end of the cylindrical body material. A number of exhaust gas discharges having an inner diameter that is the same as the inner diameter of the downstream end of the gas rectifying unit 12A1 at a position up to the downstream end that is plugged by the member, and that penetrates the thickness in the circumferential direction of the cylindrical body material By providing the hole 12A2X, the exhaust sound is silenced by lowering the pressure of the discharge gas flow a3 discharged through the exhaust gas discharge hole 12A2X.

  According to the present invention, the exhaust gas flow generated by the engine is caused to flow through the silencing effect cylinder so that the inner diameter of the throttle tube portion is gradually reduced, thereby increasing the pressure of the exhaust gas flow. While improving the torque efficiency, the exhaust gas flow through the throttle tube is released from the gas discharge holes included in the gas rectification unit and the gas discharge unit provided adjacent to each other, thereby reducing the exhaust gas pressure. Thus, the exhaust sound of the exhaust gas can be effectively silenced while increasing the torque efficiency by the simple cylindrical structure.

1 is a side view showing an overall configuration of a motorcycle. It is a rough-line sectional drawing which shows the silencer of FIG. It is a side view which shows a silencing effect cylinder.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

(1) First Embodiment In FIG. 1, reference numeral 1 denotes a muffler, which is usually called a muffler, and a cylinder head 7 of an engine 6 supported by a vehicle body 5 provided with a front wheel 3 and a rear wheel 4 of a motorcycle 2. Is connected to the downstream end of the exhaust pipe 8 led out from.

  As shown in FIG. 2, the silencer 1 includes a cylindrical pipe-shaped silencing effect cylinder 12 in a cylindrical muffler casing 11, and the upstream end 12 </ b> X of the silencing effect cylinder 12 has a partition wall 13. By being penetrated, it is fixed to the muffler casing 11.

  A connecting pipe portion 15 is connected to the upstream end portion 12X of the silencer effect cylinder 12 via a filter 14, and the upstream end portion of the connecting pipe portion 15 is exhausted from the cylinder head 7 by the mounting member 16. The exhaust gas flow indicated by the arrow a connected to the pipe 8 and thus discharged from the cylinder head 7 of the engine 6 is received by the noise reduction effect cylinder 12 through the connecting pipe portion 15 and the filter 14.

  Here, the filter 14 removes incombustible hydrocarbons, nitrogen oxides, and carbon monoxide contained in the exhaust gas with a catalyst.

  The silencing effect cylinder 12 is fixedly held on the muffler casing 11 by a support fitting 21 provided on the downstream side of the partition wall 13, and thus received from the filter 14 using the space inside the pipe-shaped silencing effect cylinder 12. The exhaust gas flow a is caused to advance straight in the muffler casing 11 in the direction of the stopper stopper member 22 provided at the downstream end.

  As shown in FIG. 3, the silencing effect cylinder 12 has a configuration in which a throttle pipe portion 12B is connected to an upstream end of the straight pipe portion 12A with respect to the exhaust gas flow a, and is integrally formed by a single SUS material as a whole. It is configured.

  The throttle tube portion 12B is connected from the upstream end connected to the filter 14 to the upstream end of the straight tube portion 12A, and has a configuration in which the inner diameter becomes smaller toward the downstream end, whereby the exhaust gas received from the filter 14 When the gas flow a is circulated as the gas flow a1, the pressure of the exhaust gas flow a taken from the engine 6 through the exhaust pipe 8 and the filter 14 by applying a flow resistance to the exhaust gas flow a, and therefore the engine The combustion pressure in the engine 6 is increased so that the generated torque of the engine 6 is increased.

  The downstream end of the throttle tube portion 12B is connected to the gas rectifying portion 12A1 through a smooth surface that does not have an uneven shape on the inner peripheral surface thereof to the upstream end of the straight tube portion 12A.

  In the case of this embodiment, the throttle pipe portion 12B and the straight pipe portion 12A are connected by a single pipe material, and the inner peripheral surface thereof is smoothly finished as a whole, whereby the inclination of the throttle pipe portion 12B. The gas flow a1 that has flowed to the downstream end while being compressed along the surface passes through the upstream end of the straight pipe portion 12A to the same inner diameter surface portion and flows as the gas flow a2, Except for being no longer compressed by the inclined surface of the throttle tube portion 12B, no change in pressure is applied, and therefore the exhaust gas is exhausted to the downstream end within the inner diameter of the straight tube portion 12A while being rectified to include a stable exhaust sound component. It will flow as flow a2.

  The gas rectification unit 12A1 has the same inner diameter as the exhaust gas flow a2 flows in the inside, and the gas flow a2 that has received the gas flow a1 flows to the downstream end while being rectified so that there is no pressure fluctuation. .

  A gas discharge part 12A2 having the same inner diameter as the gas rectification part 12A1 is connected to the downstream end of the gas rectification part 12A1.

  The gas discharge portion 12A2 has the same diameter until the downstream end is connected to the stopper tube portion 12A3, and has an infinite number of exhaust gas discharge holes 12A2X on the inner surface in the circumferential direction. As a result, the gas flow a2 received from the gas rectifying unit 12A1 in a state where the stopper tube member 12 is provided in the stopper tube portion 12A3 is radially outward from the exhaust gas discharge holes 12A2X formed in the cylindrical inner surface. The discharge gas stream a3 is discharged.

  The silencing effect cylinder 12 having such a configuration is supported by a support fitting 21 provided so as to face the partition wall 13, whereby the silencing effect cylinder 12 is closed by the support fitting 21 and the center of the muffler casing 11. The portion is cantilevered so as to protrude downstream from the partition wall 13.

  A support fitting 25 is provided on the downstream side of the silencing effect cylinder 12 so as to close the inside of the muffler casing 11, and the support fitting 25 releases the exhaust gas flow a3 through the exhaust gas discharge hole 12A2X. The gas flow is circulated as a circulation gas flow a4 that circulates through the first closed space formed by the inner surface of the muffler casing 11 and the support fittings 25 and 21.

  The support fitting 21 is provided with a pipe-like circulation cylinder 29 so as to penetrate therethrough, and the circulation gas flow a4 flowing through the first closed space passes through the circulation cylinder 29 and the support fitting 21 and the partition wall. The exhaust sound is silenced by circulating it through a second closed space formed between 13 and reducing the pressure and temperature.

  Further, in the muffler casing 11, the support fittings 21 and 25 are provided with a circulation cylinder 30 so as to penetrate the support fittings 21 and 25, and the gas flow in the second closed space is caused to flow through the internal space of the circulation cylinder 30. The discharged gas flow a5 is discharged into a discharge space formed between the support fitting 25 and the muffler closing member 11A of the muffler casing 11.

  The circulating cylinder 30 liquefies the contained incomplete combustion component and lowers the pressure and temperature when passing the discharge gas flow a5, thereby silencing the exhaust sound.

  The released gas flow a5 released from the circulation cylinder 30 is circulated as a gas flow a1 in the inner space surrounded by the muffler closing member 11A of the muffler casing 11 and the support fitting 25, thereby reducing the pressure and temperature. As a result, the exhaust sound is silenced and exhausted from the pipe-shaped exhaust port member 31 to the atmosphere as exhaust gas a7.

  In the above configuration, the exhaust gas flow a discharged from the engine 6 to the exhaust pipe 8 is introduced into the filter 14 of the muffler casing 11 to remove unnecessary components, and then sent to the throttle pipe portion 12B of the silencing effect cylinder 12. It is.

  Here, the exhaust gas flow a has a reduced inner diameter in the throttle tube portion 12B, thereby increasing the pressure of the exhaust gas flow a, thereby increasing the combustion pressure of the engine 6 and increasing the torque output of the engine 6. This maximizes the power of the engine 6.

  When the gas flow a1 passing through the throttle tube portion 12B passes through the gas rectifying portion 12A1 of the straight tube portion 12A, it is sent to the gas discharge portion 12A2 having the exhaust gas discharge holes 12A2X without being subjected to pressure fluctuation.

  The gas flow a1 at this time is discharged so as to expand as a discharge gas flow a3 into a wide space between the partition wall 13 and the support fitting 25 of the muffler casing 11 through the exhaust gas discharge hole 12A2X, and thereby the discharge gas flow a3. By circulating as the circulating gas flow a4 in a state where the pressure of the exhaust gas is reduced, the exhaust sound is further silenced.

  The discharged gas flow a3 passes through the circulation cylinders 29 and 30 and is released into a wide space between the support fitting 25 and the muffler closing member 11A, thereby further reducing the pressure of the discharge gas flow a5 in the circulation cylinder 30. The incomplete combustion component contained is liquefied when the temperature of the discharge gas flow a5 is lowered.

  Incidentally, the circulating gas flow a4 flows into the internal space between the support fittings 21 and 25 surrounded by the muffler casing 11, the internal space between the support fitting 21 and the partition wall 13 surrounded by the muffler casing 11, and the muffler casing 11. The muffler casing 11 that is always in contact with the outside air is discharged by flowing through the internal space between the enclosed support bracket 25 and the muffler closing member 11A in order to exhaust the exhaust gas a7 from the exhaust port member 31. Thus, as the temperature of the circulating exhaust gas flow decreases, the exhaust sound contained in the gas flow is gradually muted.

  Thus, the exhaust gas a7 discharged from the exhaust port member 31 is exhausted from the muffler as an exhaust gas whose exhaust volume is sufficiently suppressed in practice.

  Accordingly, as the silencing effect cylinder 12, the gas rectifying unit 12A1 connected to the upstream end of the gas discharge unit 12A2 having the exhaust gas discharge hole 12A2X, and the throttle tube unit 12B adjacent to the gas rectification unit 12A1, By being configured as a single pipe body having no step on the inner surface of the joint portion of each member, an increase in the internal combustion pressure of the engine 6 (accordingly, a function of improving torque output) and an exhaust sound due to the exhaust gas discharge hole 12A2X. It is possible to obtain a silencer 1 that can realize the suppression function by a simple single pipe body.

(2) Other Embodiments In the above-described embodiments, the case where the present invention is applied to a motorcycle has been described. However, the present invention is not limited thereto, and the engine is used in other automobiles such as a four-wheeled vehicle. The present invention can be widely applied to the case where the exhaust sound contained in the exhaust gas derived from the above is silenced. In this case, the same effect as that obtained in the above-described embodiment can be obtained.

  The present invention can be used for an automobile muffler.

DESCRIPTION OF SYMBOLS 1 ... Silencer, 2 ... Motorcycle, 3 ... Front wheel, 4 ... Rear wheel, 5 ... Car body, 6 ... Engine, 7 ... Cylinder head, 8 ... Exhaust pipe, 11 ... Muffler housing Body, 11A ... muffler closing member, 12 ... silencing effect cylinder, 12A ... straight pipe part, 12A1 ... gas rectifying part, 12A2 ... gas discharge part, 12A2X ... exhaust gas discharge hole, 12A3 ... plug Stop pipe part, 13 ... partition wall, 14 ... filter, 15 ... connecting pipe part, 16 ... mounting member, 21 ... support fitting, 22 ... stopper stopper member, 25 ... support fitting, 29, 30 …… Circulating cylinder, 31 …… Exhaust port member.

In order to solve such a problem, in the present invention, the silencer 1 of the automobile 2 provided on the downstream side of the exhaust pipe 8 of the engine 6 has a silencer effect cylinder 12 made of a cylindrical tubular material, The silencing effect cylinder 12 has an exhaust gas flow sent from the exhaust pipe 8 of the engine 6 received at the upstream end and sent to the downstream end, and an exhaust gas sent from the throttle pipe part 12B. A gas rectifier 12A1 that receives the flow at the upstream end and sends it to the downstream end, and a gas discharge unit 12A2 that receives the exhaust gas flow sent from the gas rectifier 12A1 at the upstream end and sends it in the downstream end direction The throttle tube portion 12B has an exhaust gas flow that enters the inside diameter of the cylindrical tubular material as the size of the inside diameter of the cylindrical tubular material decreases in the direction of sending the exhaust gas flow from the upstream end to the downstream end. Has a configuration to increase the pressure of the gas The upstream end of the flow portion 12A1, together with the same size inside diameter of the inner diameter of the downstream end of the choke pipe portion 12B, the exhaust gas flow received in the upstream end toward the direction to send the downstream end The cylindrical tubular material has a configuration that suppresses fluctuations in the pressure of the exhaust gas flow passing through the inside diameter by maintaining the same size of the inside diameter of the cylindrical tubular material. And the downstream end that is plugged by the stopper member has an inner diameter that is the same as the inner diameter of the downstream end of the gas rectifying unit 12A1, and a large number that penetrates the thickness in the circumferential direction of the cylindrical tubular material. and Yu the arrangement for muffling the exhaust sound by lowering the pressure of the exhaust gas discharge holes effluent gas stream a3 to 12A2X released through by providing the exhaust gas discharge holes 12A2X, silencing effect cylinder 12, The pipe section 12B, the gas rectifying section 12A1 and the gas discharge section 12A2 are formed as a single unit as a whole, and the inner surface of the joint of the throttle pipe section 12B, the gas rectification section 12A1 and the gas discharge section 12A2 The inner surface was processed smoothly without a step so as not to cause pressure fluctuations in the exhaust gas flow passing through the inside of the cylindrical tubular material.

According to the present invention, the inner diameter of the throttle tube portion is gradually reduced by flowing the exhaust gas flow generated by the engine through a silencer cylinder formed by a single tube as a whole. To increase the pressure of the exhaust gas flow, thereby improving the torque efficiency of the engine, and the gas contained in the gas rectification unit and the gas discharge unit provided adjacent to the exhaust gas flow through the throttle tube The pressure of the exhaust gas is reduced by releasing it from the discharge hole, and thus the exhaust sound of the exhaust gas can be effectively silenced while increasing the torque efficiency by using a silencer cylinder that is simple and easy to assemble as an automobile part. .

In order to solve such a problem, in the present invention, the silencer 1 of the automobile 2 provided on the downstream side of the exhaust pipe 8 of the engine 6 has a silencer effect cylinder 12 made of a cylindrical tubular material, The silencing effect cylinder 12 has an exhaust gas flow sent from the exhaust pipe 8 of the engine 6 received at the upstream end and sent to the downstream end, and an exhaust gas sent from the throttle pipe part 12B. A gas rectifier 12A1 that receives the flow at the upstream end and sends it to the downstream end, and a gas discharge unit 12A2 that receives the exhaust gas flow sent from the gas rectifier 12A1 at the upstream end and sends it in the downstream end direction The throttle tube portion 12B has an exhaust gas flow that enters the inside diameter of the cylindrical tubular material as the size of the inside diameter of the cylindrical tubular material decreases in the direction of sending the exhaust gas flow from the upstream end to the downstream end. Has a configuration to increase the pressure of the gas The upstream end of the flow portion 12A1 has an inner diameter that is the same as the inner diameter of the downstream end of the throttle tube portion 12B, and faces the direction in which the exhaust gas flow received at the upstream end is sent to the downstream end. It has thereby suppressing fluctuations in pressure of the exhaust gas flow through the within the inner diameter by maintaining the inner diameter of the cylindrical body tubing to the same value, the gas discharge section 12A2 is upstream of the cylinder tubing The position from the end to the downstream end that is plugged by the plugging member has an inner diameter that is the same as the inner diameter of the downstream end of the gas rectifying unit 12A1, and penetrates the thickness in the circumferential direction of the cylindrical tubular material. By providing a large number of exhaust gas discharge holes 12A2X, the pressure of the discharge gas flow a3 discharged through the exhaust gas discharge holes 12A2X is reduced, and the exhaust sound is silenced. 2, throttle tube portion 12B, the integral as a whole a gas rectification part 12A1 and a gas discharge portion 12A2, is constituted by a single tubular body, and the inner surface, choke tube portion 12B, the gas rectifying portion 12A1 and the gas discharge section 12A2 The inner surface of the joint portion is smoothly processed without a step, and the entire inner surface of the one tube body is welded between the upstream end and the downstream end in the longitudinal direction of the tube body. By not having it, pressure fluctuations were not caused in the exhaust gas flow passing through the inside of the cylindrical tubular material.

According to the present invention, the exhaust gas flow generated by the engine is throttled by flowing it through a silencer cylindrical body that is a single integral tube body and does not have a step or a welded portion on the inner surface. By gradually reducing the inner diameter of the pipe part, the pressure of the exhaust gas flow is increased without causing fluctuations, and as a result, the torque efficiency of the engine is improved and the exhaust gas flow through the throttle pipe part is adjacent. Silencer effect cylinder that lowers the pressure of exhaust gas by releasing it from the gas discharge holes included in the gas rectification unit and gas discharge unit provided in the cylinder, thus making it easy to assemble exhaust gas exhaust noise as a car part It is possible to effectively mute while increasing torque efficiency using the body.

The gas discharge portion 12A2 has the same diameter until the downstream end is connected to the stopper tube portion 12A3, and has an infinite number of exhaust gas discharge holes 12A2X on the inner surface in the circumferential direction. As a result, the gas flow a2 received from the gas rectifying unit 12A1 in a state where the stopper tube member 12 is provided in the stopper tube portion 12A3 is radially outward from the exhaust gas discharge holes 12A2X formed in the cylindrical inner surface. It discharges as discharge gas flow a3.

The exhaust gas flow a5 released from the circulation cylinder 30 reduces the pressure and temperature by circulating as an exhaust gas flow a6 in the internal space surrounded by the muffler closing member 11A of the muffler casing 11 and the support fitting 25. As a result, the exhaust sound is silenced and exhausted from the pipe-shaped exhaust port member 31 to the atmosphere as the exhaust gas a7.

Incidentally, the circulating gas flow a4 flows into the internal space between the support fittings 21 and 25 surrounded by the muffler casing 11, the internal space between the support fitting 21 and the partition wall 13 surrounded by the muffler casing 11, and the muffler casing 11. The muffler casing 11 that is always in contact with the outside air is discharged by flowing through the internal space between the enclosed support bracket 25 and the muffler closing member 11A in order to exhaust from the exhaust port member 31 as exhaust gas a7. Thus, as the temperature of the circulating exhaust gas flow decreases, the exhaust sound contained in the gas flow is gradually muted.

Claims (3)

A muffler for automobiles provided on the downstream side of an exhaust pipe of an engine having a muffler effect cylinder made of a cylindrical material,
The silencing effect cylinder is configured to receive an exhaust gas flow sent from the exhaust pipe of the engine at the upstream end and send the exhaust gas flow sent from the throttle pipe to the downstream end. A gas rectifier that receives the upstream end and sends it to the downstream end, and a gas discharge part that receives the exhaust gas flow sent from the gas rectifier at the upstream end and sends it in the downstream end direction;
The throttle tube portion is configured to reduce the size of the inner diameter of the cylindrical body material as the exhaust gas flow is sent from the upstream end to the downstream end, and the exhaust gas passes through the inner diameter. Having a configuration to increase the pressure of the flow,
The gas rectifying unit has an inner diameter that is the same as the inner diameter of the downstream end of the throttle tube unit, and is directed to a direction of sending the exhaust gas flow received at the upstream end toward the downstream end. Having a configuration that suppresses fluctuations in the pressure of the exhaust gas flow passing through the inside diameter by maintaining the same size of the inside diameter of the cylindrical material,
The gas discharge part has an inner diameter that is the same as the inner diameter of the downstream end of the gas rectifying part at a position from the upstream end of the cylindrical material to the downstream end that is plugged by a stopper lid member. Exhaust gas by reducing the pressure of the exhaust gas flow discharged through the exhaust gas discharge hole by providing a large number of exhaust gas discharge holes penetrating the thickness in the circumferential direction of the cylindrical body material An automobile silencer characterized by having a structure for silencing sound. On the inner surface of the cylindrical material, the inner surface of the joint portion of the throttle tube portion, the gas rectifying portion, and the gas discharge portion is processed smoothly without a step, and thereby the exhaust gas flow passing through the inside of the cylindrical material. The automobile muffler according to claim 1, wherein pressure fluctuation is not caused. A muffler for automobiles provided on the downstream side of an exhaust pipe of an engine having a muffler effect cylinder made of a cylindrical material,
The silencing effect cylinder is configured to receive an exhaust gas flow sent from the exhaust pipe of the engine at the upstream end and send the exhaust gas flow sent from the throttle pipe to the downstream end. A gas rectifier that receives the upstream end and sends it to the downstream end, and a gas discharge part that receives the exhaust gas flow sent from the gas rectifier at the upstream end and sends it in the downstream end direction;
The throttle tube portion is configured to reduce the size of the inner diameter of the cylindrical body material as the exhaust gas flow is sent from the upstream end to the downstream end, and the exhaust gas passes through the inner diameter. Having a configuration to increase the pressure of the flow,
The gas rectifying unit has an inner diameter that is the same as the inner diameter of the downstream end of the throttle tube unit, and is directed to a direction of sending the exhaust gas flow received at the upstream end toward the downstream end. Having a configuration that suppresses fluctuations in the pressure of the exhaust gas flow passing through the inside diameter by maintaining the same size of the inside diameter of the cylindrical material,
The gas discharge part has an inner diameter that is the same as the inner diameter of the downstream end of the gas rectifying part at a position from the upstream end of the cylindrical material to the downstream end that is plugged by a stopper lid member. Exhaust gas by reducing the pressure of the exhaust gas flow discharged through the exhaust gas discharge hole by providing a large number of exhaust gas discharge holes penetrating the thickness in the circumferential direction of the cylindrical body material Having a structure to mute the sound,
In the muffler casing, the silencing effect cylinder is cantilevered by a partition provided in the muffler casing at the upstream end portion of the throttle tube portion, and the throttle tube portion or the gas rectifying portion of the throttle tube portion. The gas is contained in a first space formed by a first support fitting that supports the portion on the muffler casing, and a second support fitting provided at a position downstream from the downstream end of the gas discharge portion. The discharge portion is protruded, and the exhaust gas flow discharged from the gas discharge portion into the first space through the exhaust gas discharge hole of the gas discharge portion is provided so as to penetrate the first support fitting. It circulates in the 2nd space formed between the said 1st support metal fitting and the said partition via the 1st circulation cylinder, and penetrates the said 1st support metal fitting and the said 2nd support metal fitting Through a second circulating cylinder provided to The exhaust gas flow in the second space is circulated in a third space formed by the second support fitting and the muffler closing member of the muffler casing, and is provided so as to penetrate the muffler closing member. An automobile silencer characterized in that the exhaust gas flow circulating in the third space is exhausted as exhaust gas generated in the engine via a tubular exhaust port member.

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