JPH08286676A - Actuator integral with sub-muffler for noise control device - Google Patents

Abstract

PURPOSE: To integrate an actuator and a sub-muffler for a noise control device. CONSTITUTION: A noise control device having a loudspeaker 6 which outputs a canceling sound of a same amplitude and an opposite phase and enclosed in an enclosure 7 is provided with a sub-muffler 3 which is located in mid-way of an exhaust pipe connected to an engine and cancels the noises in exhaust gas by means of reflection and interference, and an actuator 5 which is integrated with a sub-muffler 3 so that a first rear exhaust pipe 4 which surrounds the rear of the loudspeaker 6 and to be connected to the exit of exhaust gas can pass through a enclosure 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator of a noise control device for canceling noise emitted from an engine,
In particular, the present invention relates to an actuator of a noise control device that can be integrated with a sub muffler provided additionally.

[0002]

2. Description of the Related Art FIG. 7 is a diagram showing an actuator of a conventional noise control device. As shown in the figure, the engine 1 is provided with a front exhaust pipe 2 through which noise passes with exhaust gas. The front exhaust pipe 2 is provided with a sub muffler 3 that reduces noise by reflection and interference of noise waves. Further, this sub-muffler 3 is provided with a rear exhaust pipe 4 for discharging exhaust gas to the atmosphere. In the vicinity of the outlet of the rear exhaust pipe 4, an actuator 5 of a noise control device that outputs a cancel sound that cancels noise emitted from the rear exhaust pipe 4 is provided. The cancel sound wave has a characteristic of the same phase as the noise wave but the opposite phase, and the cancel signal before becoming the cancel sound wave is formed by a noise control device (not shown). Here, the actuator 5 outputs the cancel sound, the speaker 6, the enclosure 7 for preventing the sound emitted from the rear surface of the speaker 6 from mixing with the sound emitted from the front surface, and the sound emitted from the front surface of the speaker 6. A guide portion 8 for guiding the outlet of the rear exhaust pipe 4.

The reason why the sub muffler 3 is provided in addition to the actuator 5 of the noise control device is that the high frequency component of noise cannot be processed from the viewpoint of the processing speed of the noise control device, and therefore the sub muffler 3 must be entrusted to it. Further, low-frequency components such as pulsating sound when the engine 1 is idling cannot be processed from the viewpoint of the processing capability of the noise control device and the capability of the speaker, so that the sub-muffler 3, the front exhaust pipe 2, and the rear exhaust pipe 4 must be entrusted. I don't get. That is, in order to secure reflection and interference of noise waves having a long wavelength, the size of the sub-muffler 3 is limited, so the front exhaust pipe 2 and the rear exhaust pipe 4
It is necessary that the length of the is equal to or larger than a certain length.

[0004]

However, if the actuator 5 can process high-frequency components and low-frequency components as well,
Since the sub-muffler 3 is not required, the space merit is improved, but the reproduction capacity of the actuator 5 is limited, so that the sub-muffler 3 has to be separated from the actuator 5 and the space merit is reduced.
Furthermore, there is a problem in that the structure is complicated because it requires a structure such as suspending the sub muffler 3 from the vehicle body.

Therefore, in view of the above problems, it is an object of the present invention to provide an actuator of a noise control device which can increase the space merit and can simplify the structure.

[0006]

In order to solve the above problems, the present invention provides an actuator of a noise control device having the following configuration. That is, according to the first aspect of the present invention, a noise control device having a speaker that outputs a canceling sound of the same amplitude in a phase opposite to that of engine noise and is surrounded by an enclosure in the rear is provided in the middle of an exhaust pipe connected to the engine. A sub-muffler that is disposed and cancels noise by reflection and interference of noise itself in the exhaust gas, and a first rear exhaust pipe that surrounds the rear of the speaker and that is connected to the exhaust gas outlet of the sub-muffler passes through the enclosure. And an actuator integrated with the sub-muffler.

According to a second aspect of the invention, a noise control device having a speaker which outputs a canceling sound of the same amplitude in a phase opposite to that of the engine noise and which is surrounded by an enclosure behind, is provided in the middle of an exhaust pipe connected to the engine. A sub-muffler that is disposed in the exhaust gas and cancels the noise by reflection and interference of the noise itself in the exhaust gas, and a first rear exhaust pipe that surrounds the rear of the speaker and that is coupled to the exhaust gas outlet of the sub-muffler passes through the enclosure. As described above, an actuator integrated with the sub-muffler and an outlet are provided on the inlet side of the exhaust gas of the sub-muffler, and a certain length is extended and bent from the outlet in a direction opposite to the direction in which the exhaust gas entering the inlet side advances. A second rear exhaust pipe along the outside of the integrated actuator and the first rear exhaust pipe when the engine is running at low speed. A first valve for passing only the exhaust gas in the pipe, the engine and the second valve to pass only the exhaust gas to the second rear exhaust pipe is provided in the case of high rotation.

In the first or second aspect of the invention, a heat insulating material is attached to the inner wall of the enclosure, and further outside the portion where the rear exhaust pipe connected to the exhaust gas outlet of the sub-muffler passes through the interior of the enclosure. Good. Further, in the first or second invention, the inner wall of the enclosure is
Furthermore, a rear exhaust pipe coupled to the outlet of the exhaust gas of the sub-muffler is provided with a heat insulating material outside the portion passing through the inside of the enclosure, and further, a punching hole is formed in the portion of the rear exhaust pipe passing through the enclosure, Glass wool may be wrapped around the outside.

Further, in the first invention, a heat insulating material is attached to the inner wall of the enclosure, and further to the outside of the portion where the rear exhaust pipe connected to the exhaust gas outlet of the sub-muffler passes through the interior of the enclosure. Instead of the rear exhaust pipe, an outlet is provided on the inlet side of the exhaust gas of the sub-muffler, and the integrated actuator is extended and bent from the outlet in a direction opposite to the direction in which the exhaust gas entering the inlet side advances. A rear exhaust pipe may be provided along the outside.

[0010]

According to the sub muffler integrated actuator of the noise control device of the present invention, in the first invention, the first rear exhaust pipe that surrounds the rear of the speaker and is connected to the exhaust gas outlet of the sub muffler is an enclosure. Since it is integrated with the sub-muffler so as to pass therethrough, space advantages and cost advantages can be obtained.
In addition to the first aspect of the present invention, the second aspect of the present invention allows the exhaust gas to pass through the first rear exhaust pipe only when the engine is at a low rotation speed, and the second rear portion when the engine is at a high rotation speed. By passing the exhaust gas only through the exhaust pipe, low frequencies such as pulsation noise are reduced to assist the reduction ability of the speaker, and noise reduction can be efficiently achieved in the entire rotation range. Regarding the first or second invention, on the inner wall of the enclosure,
Furthermore, by attaching a heat insulating material outside the portion where the rear exhaust pipe connected to the exhaust gas outlet of the sub muffler passes through the inside of the enclosure, the speaker can be protected from heat and the durability can be improved. Further, in the first or second invention, a heat insulating material is attached to an inner wall of the enclosure, and a rear exhaust pipe connected to an exhaust gas outlet of the sub-muffler is provided outside a portion passing through the interior of the enclosure. By punching a hole in the rear exhaust pipe that passes through the enclosure and wrapping glass wool around the hole, not only the durability against the heat of the speaker but also the high frequency noise that cannot be canceled by the speaker can be reduced. . Further, according to the first invention, a heat insulating material is attached to an inner wall of the enclosure, and a rear exhaust pipe coupled to an exhaust gas outlet of the sub-muffler is provided outside a portion passing through the interior of the enclosure.
By providing the second rear exhaust pipe in place of the rear rear exhaust pipe, not only the durability of the speaker against the heat of the speaker but also the low frequency such as pulsating sound can be reduced to assist the reduction capability of the speaker.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an example of an actuator of a noise control device according to a first embodiment of the present invention, which is integrated with a sub muffler. As shown in the figure, the engine 1 is provided with a front exhaust pipe 2 through which noise passes with exhaust gas. The front exhaust pipe 2 is provided with a sub-muffler integrated actuator 10 in which the sub muffler 3, the rear exhaust pipe 4, and the actuator 5 are integrated. As described above, the sub-muffler 3 reduces noise by reflecting and interfering with the noise wave itself from the front exhaust pipe 2, and the rear exhaust pipe 4 provided at the outlet of the sub-muffler 3 has its outlet. The exhaust gas from the actuator to the atmosphere, and the actuator 5
Is a speaker 6 that outputs a canceling sound, an enclosure 7 that prevents the sound emitted from the rear surface of the speaker 6 from being mixed with the sound emitted from the front surface, and the sound emitted from the front surface of the speaker 6 in the rear exhaust pipe 4. The guide section 8 guides the passenger to the exit.

FIG. 2 is a diagram showing the sub-muffler integrated actuator 10 of FIG. In the sub-muffler integrated actuator 10 shown in this figure, as an example, the inside of the sub-muffler 3 is partitioned by a partition plate 21 to form a first chamber 22 and a second chamber 23. The front exhaust pipe 2 is led to the second chamber 23, and the rear exhaust pipe 4 is led from the first chamber 22. A pipe 24 having a fixed length is provided between the first chamber 22 and the second chamber 23 so as to communicate between them.

As described above, according to the first embodiment, the low frequency components of noise are mainly the front exhaust pipe 2 and the pipe 2.
4 and the rear exhaust pipe 4, the high-frequency components thereof are mainly reduced in the sub-muffler 3, and other main components are reduced by the actuator 5. While maintaining the noise control effect as in the conventional case, the sub-muffler 3, the rear portion is reduced. Since the exhaust pipe 4 and the actuator 5 are integrated, the space merit can be increased and the structure is further simplified. Naturally, the cost merit can be obtained by such integration.

By the way, as shown in FIG.
In the enclosure 7 that surrounds the rear of the speaker 6, the speaker 6 is deteriorated by receiving the radiant heat from the sub muffler 3 and the radiant heat from the rear exhaust pipe 4 penetrating therethrough, but it is necessary to prevent this deterioration as described below. FIG. 3 is a diagram showing an example of an actuator of a noise control device according to a second embodiment of the present invention, which is integrated with a sub muffler. As shown in the figure, a heat insulating material is attached to the wall inside the enclosure 7, and further, a heat insulating material is attached to the outside of the rear exhaust pipe 4 passing through the enclosure 7. In this way, the temperature of the speaker 6 is prevented from rising and deterioration is prevented.

FIG. 4 is a diagram showing an example of an actuator of a noise control device according to a third embodiment of the present invention, which is integrated with a sub muffler. As shown in this figure (a), a high frequency muffler 40 is provided inside the enclosure 7 in the middle of the rear exhaust pipe 4.
Is provided. As shown in this figure (b), the high-frequency muffler 40 has a punching hole 41 provided in the rear exhaust pipe 4, and glass wool 42 is wound around the punching hole 41.

With such a high frequency muffler 40, it is possible to reduce high frequency noise that cannot be canceled by the speaker 6. In this case, the glass wool 42 serves as a heat insulating material that blocks the conduction of heat to the speaker 6. FIG. 5 is a diagram showing an example of an actuator of a noise control device according to a fourth embodiment of the present invention, which is integrated with a sub muffler. As shown in the figure, the rear exhaust pipe 14 is led out from the first chamber 22 of the sub-muffler 3 in a direction opposite to the direction of the speaker 6, that is, toward the inlet side of the front exhaust pipe 2 to the sub-muffler 3 by a certain length. It is bent and extended along the outside of the sub-muffler integrated actuator 10, and is arranged in parallel with the guide portion 8.

In this way, low-frequency sounds such as pulsating sounds can be reduced by the long rear exhaust pipe 14 to assist the reducing ability of the speaker 8. FIG. 6 is a diagram showing an example of an actuator of a noise control device according to a fifth embodiment of the present invention, which is integrated with a sub muffler. As shown in the figure, the sub-muffler integrated actuator 10 is a combination of the rear exhaust pipe 4 of FIG. 3 and the rear exhaust pipe 14 of FIG. 5, and these are switched and used by valves 51 and 52. That is, the valve 51 is opened when the engine 1 is at high speed and closed when the engine is at low speed. The valve 52 is closed when the engine 1 rotates at high speed, and opens when the engine 1 rotates at low speed. The reason why the rear exhaust pipe 14 is used by switching in this manner is that the rear exhaust pipe 14 has a longer pipe length than the rear exhaust pipe 4, so that the exhaust efficiency is deteriorated. Therefore, the rear exhaust pipe 4 and the rear exhaust pipe 14 can be switched depending on the number of revolutions of the engine 1 to achieve efficient noise reduction in the entire rotation range.

[0018]

As described above, according to the present invention, the first rear exhaust pipe that surrounds the rear of the speaker and is connected to the exhaust gas outlet of the sub muffler is integrated with the sub muffler so as to pass through the enclosure. Since it has been done, space advantages and cost advantages can be brought out. Since the second rear exhaust pipe is provided instead of the first rear exhaust pipe,
It is possible to reduce low frequencies such as pulsating sounds to assist the reduction ability of the speaker. Further, when the engine is at low speed, the exhaust gas is passed only through the first rear exhaust pipe, and when the engine is at high speed, the exhaust gas is passed through only the second rear exhaust pipe. The low frequency is reduced to assist the reduction ability of the speaker, and noise reduction can be efficiently achieved in the entire rotation range. On the inner wall of the enclosure,
Furthermore, the first combined with the exhaust gas outlet of the sub-muffler
Since the heat insulating material is attached to the outside of the portion where the rear exhaust pipe passes through the inside of the enclosure, the speaker can be protected from heat and the durability can be improved. By punching a hole in the rear exhaust pipe that passes through the enclosure and winding glass wool around the hole, not only the durability of the speaker against heat but also the high frequency noise that cannot be canceled by the speaker can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of an actuator of a noise control device according to a first exemplary embodiment of the present invention, which is integrated with a sub muffler.

FIG. 2 is a diagram showing the sub-muffler integrated actuator 10 of FIG.

FIG. 3 is a diagram showing an example of an actuator of a noise control device according to a second embodiment of the present invention, which is integrated with a sub muffler.

FIG. 4 is a diagram showing an example of an actuator of a noise control device according to a third embodiment of the present invention, which is integrated with a sub muffler.

FIG. 5 is a diagram showing an example of an actuator of a noise control device according to a fourth embodiment of the present invention, which is integrated with a sub muffler.

FIG. 6 is a diagram showing an example of an actuator of a noise control device according to a fifth embodiment of the present invention, which is integrated with a sub muffler.

FIG. 7 is a diagram showing an actuator of a conventional noise control device.

[Explanation of symbols]

 1 ... Engine 3 ... Sub muffler 4 ... First rear exhaust pipe 5 ... Actuator 6 ... Speaker 7 ... Enclosure 10 ... Sub muffler integrated actuator 14 ... Second rear exhaust pipe 30 ... Insulator 40 ... High frequency muffler 41 ... Punching hole 42 ... Glass wool 51 ... First valve 52 ... Second valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiaki Kusano 1-2-2 Gosho-dori, Hyogo-ku, Kobe-shi, Hyogo Within Fujitsu Ten Limited (72) Inventor Shinichi Iwamoto 1-chome, Gosho-dori, Hyogo-ku, Hyogo Prefecture No. 2 to 28 in Fujitsu Ten Limited

Claims (5)

[Claims] 1. A noise control device comprising a speaker (6) which outputs a canceling sound of the same amplitude in a phase opposite to that of the noise of the engine (1) and which is surrounded by an enclosure (7) in the rear, wherein the engine (1) is A sub-muffler (3) which is disposed in the middle of the exhaust pipe to be coupled and cancels noise by reflection and interference of noise itself in the exhaust gas, and a sub-muffler (3) surrounding the rear of the speaker (6)
First rear exhaust pipe (4) coupled to the exhaust gas outlet of the
A sub-muffler integrated actuator of a noise control device, comprising an actuator (5) integrated with the sub-muffler (3) so that the sub-muffler passes through the enclosure (7). 2. A noise control device which outputs a canceling sound of the same amplitude in a phase opposite to the noise of the engine (1) and which has a speaker (6) surrounded by an enclosure (7) in the rear, wherein the engine (1) is A sub-muffler (3) which is disposed in the middle of the exhaust pipe to be coupled and cancels noise by reflection and interference of noise itself in the exhaust gas, and a sub-muffler (3) surrounding the rear of the speaker (6)
First rear exhaust pipe (4) coupled to the exhaust gas outlet of the
So as to pass through the enclosure (7), an actuator (5) integrated with the sub-muffler (3), an outlet provided on the inlet side of the exhaust gas of the sub-muffler (3), and the exhaust gas entering the inlet side The second rear exhaust pipe (14) extending along the outer side of the integrated actuator (5) by extending a certain length from the outlet and bending the same in the direction opposite to the direction in which the engine (1) rotates at a high speed. In some cases, the first valve (5) that allows the exhaust gas to pass through only the first rear exhaust pipe (4).
1) and a second valve (52) for allowing exhaust gas to pass only through the second rear exhaust pipe (14) when the engine (1) operates at a low speed. Sub muffler integrated actuator. 3. The inner wall of the enclosure (7), further outside the portion where a first rear exhaust pipe (4) coupled to the exhaust gas outlet of the sub-muffler (3) passes through the interior of the enclosure (7). A sub-muffler integrated actuator for a noise control device according to claim 1 or 2, characterized in that a heat insulating material (30) is additionally provided. 4. The inner wall of the enclosure (7), further outside the portion where a first rear exhaust pipe (4) coupled to the exhaust gas outlet of the sub-muffler (3) passes through the interior of the enclosure (7). A heat insulating material (30) is attached to the above, a punching hole (41) is further formed in a portion of the first rear exhaust pipe (4) passing through the enclosure (7), and glass wool (42) is wound around the punching hole (41). The sub-muffler integrated actuator of the noise control device according to claim 1 or 2, characterized in that. 5. The inner wall of the enclosure (7), further outside the portion where a first rear exhaust pipe (4) coupled to the exhaust gas outlet of the sub-muffler (3) passes through the interior of the enclosure (7). A heat insulating material (30) is attached to the sub-muffler (3) instead of the first rear exhaust pipe (4), and an outlet is provided at the inlet side of the exhaust gas of the sub-muffler (3) to allow the exhaust gas to enter the inlet side. Noise according to claim 1, characterized in that it comprises a second rear exhaust pipe (14) which extends in the opposite direction from the outlet by a certain length and is bent and runs along the outside of the integrated actuator. Actuator integrated with sub-muffler of control device.