JP5284805B2 - Intake device for internal combustion engine - Google Patents

Description

  The present invention relates to an intake device for an internal combustion engine, and more particularly to an intake device with a so-called sound quality adding function that positively releases a sound effect to be added to the intake sound to the outside.

  As an intake device for this type of internal combustion engine, for example, a tubular body is connected to the intake system, and a vibrating body that vibrates in response to intake pulsation is provided on the tubular body, and sound effects based on the vibration of the vibrating body are positively generated. It is known that in addition to the intake sound, it is possible to obtain an intake sound with a sense of sport or a powerful feeling in the passenger compartment. In addition, on the premise of the above-mentioned known technology, Patent Document 1 is one in which a plurality of vibration regions having different resonance frequencies are provided in one vibrating body, and sound effects having different frequencies can be created for each region. Has been proposed.

JP 2008-184991 A

  However, in the technique described in Patent Document 1, even if a plurality of vibration regions that are offset from each other in the plate thickness direction and have different resonance frequencies are provided, it is still a single plate-like vibrating body. Therefore, for example, although tuning of the resonance frequency due to the difference in material, plate thickness, rigidity, etc. for each vibration region is relatively easy, tuning of the resonance frequency based on the difference in position for each vibration region is difficult. .

  In particular, a tubular body in which a vibrating body is arranged functions as a resonance tube, but tuning based on the difference in resonance tube length and tube diameter is difficult, and the difference in resonance tube length and tube diameter is fully reflected in the sound effect. It will not be possible. Therefore, it is not possible to sufficiently create a plurality of sound effects having predetermined levels with different frequencies, and there is still room for improvement in terms of further improving the sound quality addition effect.

  The present invention has been made paying attention to such a problem, and in particular, an internal combustion engine capable of creating a plurality of sound effects at predetermined levels having different frequencies by sufficiently reflecting differences in resonance tube length and tube diameter. An air intake device is provided.

According to the first aspect of the present invention, the tubular body is connected to the intake system of the internal combustion engine, and a plurality of partition-shaped vibrating bodies that vibrate in accordance with the intake air pulsation of the intake system are arranged in series inside the tubular body. Thea is, the vibrator is not isolate the interior of the tubular body to the intake system side and opposite the suction system side in the longitudinal direction, the vibrating body other than the vibration of the closest upstream to the intake system side tubular member And is provided with an actuator for rotating the rotatable vibrating body, and the pipe of the tubular body is opened and closed by the rotation of the rotatable vibrating body. possible and to be characterized by Thea Rukoto.

In this way, the tubular body conduit can be opened and closed by the rotation of the vibrating body other than the upstream vibrating body closest to the intake system side, so that the effectively opening and closing vibrating body functions effectively. Or it can be prevented from functioning as a vibrating body .

According to a second aspect of the present invention, the longitudinal intermediate portion of the tubular body is an expansion chamber having a locally large tube diameter, and the upstream vibrating body closest to the intake system side is placed in the expansion chamber. Arrangement is desirable for obtaining a greater resonance effect.

Furthermore, as described in claim 3, the upstream vibrating body closest to the intake system side has a bottomed cylindrical shape with one end closed and a bellows shape, which improves the original function of the vibrating body. Is desirable.

Here, as described in claim 4, two vibrating bodies are arranged in addition to the upstream vibrating body closest to the intake system side, and the two vibrating bodies can be individually rotated on the tubular body. If supported , the two vibrators are individually opened and closed, which is further advantageous in improving the function of adding sound quality.

  Therefore, in at least the first aspect of the present invention, the respective vibrating bodies arranged inside the common tubular body vibrate at a specific resonance frequency in accordance with the intake air pulsation of the intake system, and have a predetermined sound effect. Will occur. In this case, for example, if the number of vibrating bodies is two, the tubular body functions as a resonance tube. Therefore, the resonance frequency of the upstream vibrating body close to the intake system side is lower than the upstream vibrating body. It depends on the tube length and tube diameter to the vibrating body. On the other hand, the resonance frequency of the downstream vibrator is determined by the tube length and the pipe diameter on the downstream side of the downstream vibrator. As a result, it is possible to amplify or increase a plurality of sound effects of different sound pressure levels with different frequencies by the excitation action of the vibration due to the intake pulsation of the upstream vibration body and the vibration due to the intake pulsation downstream. It becomes possible.

  According to the first aspect of the present invention, it is possible to easily create a plurality of sound effects having predetermined sound pressure levels having different frequencies by sufficiently reflecting the difference in tube length of the tubular body functioning as the resonance tube for each vibrating body. can do.

In addition, since the tubular body can be opened / closed by rotating the vibrating body other than the upstream vibrating body, the openable / closable vibrating body can function effectively or function as a vibrating body. For example, it is possible to arbitrarily and actively variably control the sound quality of the sound effect according to the engine speed.

According to the second aspect of the present invention, the expansion chamber functions as a resonance chamber, which is more advantageous in creating a plurality of sound effects at predetermined levels having different frequencies.

According to the invention described in claim 3, by adopting a bottomed cylindrical and bellows-like one closed at one end as the upstream vibrating body, the sound pressure level can be increased by the vibration of the vibrating body. This is more advantageous in creating a plurality of sound effects having predetermined sound pressure levels with different frequencies.

According to the fourth aspect of the present invention, since two vibrating bodies are arranged in addition to the upstream vibrating body, and the two vibrating bodies can be opened and closed individually, for example, according to the engine speed. The degree of freedom in controlling the sound quality of the sound effect arbitrarily and positively is further increased.

Plan view schematically showing an engine room comprising an air intake system of an automatic vehicle. It is a figure which shows the basic technical example of this invention, and is expanded sectional explanatory drawing of the sound creator pipe shown in FIG. It is a figure which shows another basic technical example of this invention, and is sectional explanatory drawing of a sound creator pipe. It is a figure which shows the 1st Embodiment of this invention and is sectional explanatory drawing of a sound creator pipe. Sectional explanatory drawing which shows the state in which both sound plates opened in the sound creator pipe of FIG. FIG. 5 is a perspective view showing a state in which one sound plate is opened in the sound creator pipe of FIG. 4.

1 and 2 are views showing basic technical examples assumed by the present invention. In particular, FIG. 1 is an explanatory plan view schematically showing an engine room including an air intake device of an automobile, and FIG. 2 is a schematic diagram of FIG. Details of each part are shown.

  As shown in FIG. 1, for example, a V-type 6-cylinder engine 4 is disposed in an engine room 1 that is separated by a dash panel 2, a front side panel 3, and the like. The engine 4 is connected to an intake device 5 as an intake system for introducing outside air into the engine 4. The intake device 5 is arranged so that an outside air intake 6 is opened in the front of the vehicle. Air taken in from the outside air intake 6 is air cleaner 7, throttle valve 8, an intake collector (not shown), It is introduced into the combustion chamber of each cylinder through a branch pipe.

The clean side duct 9 that connects the clean side of the air cleaner 7 and the throttle valve 8 is adapted to the intake pulsation in the intake device 5 caused by the reciprocating motion of a piston and an intake valve (both not shown). A sound creator pipe 10 that is a tubular body is connected as a sound quality adding device that amplifies or enhances (increases) an intake sound of a predetermined frequency and emits it as a sound effect of a predetermined sound pressure level (“Sound Creator” is a registered trademark). . In addition, 11 of FIG. 1 has shown the steering wheel.

  FIG. 2 is a cross-sectional view showing the details of the sound creator pipe 10. The connection port 10a at one end is connected to the clean side duct 9 as shown in FIG. 1, and the open end 10b at the other end is a predetermined distance from the dash panel 2. They are opposed to each other. Therefore, as described above, the intake air pulsation of the intake device 5 is introduced from the connection port 10a side of the sound creator pipe 10.

  The sound creator pipe 10 is divided into two resin-made pipe pieces 12 and 13 having a flange portion 12a or 13a in the longitudinal direction, and one piece is formed by fitting both the flange portions 12a and 13a. A continuous cylindrical tubular passage is formed. However, a large-diameter portion 14 having a locally increased diameter is formed at the end of one pipe piece 13, so that when both pipe pieces 12 and 13 are fitted together as described above, a large diameter portion 14 is formed. The diameter portion 14 functions as an expansion chamber having a larger diameter than the small diameter portion 15 which is a general portion of the pipe piece 13.

  A bellows-like sound piece 16 made of resin and having a substantially hat-shaped cross-section is disposed in the large-diameter portion 14 that functions as the expansion chamber. Due to the presence of the sound piece 16, the sound piece 16 substantially functions as a partition wall, and the sound creator pipe 10 is separated into a space on one pipe piece 12 side and a space on the other pipe piece 13 side. Each space is independent of each other, and as shown in FIG. 1, the space on one pipe piece 12 side communicates with the internal space of the clean side duct 9 which is a part of the intake device 5. Yes.

  The sound piece 16 has a bottomed cylindrical shape that is convex toward the open end 10b side, and a flange portion 16a is integrally formed on the base side, and a body portion that is an intermediate portion in the longitudinal direction is formed. The bellows portion 16b is rich in flexibility, and the vibration surface 16c corresponding to the bottom portion of the bottomed shape functions as a vibration source or a sound pressure generation source. When the flange portions 12a and 13a of both pipe pieces 12 and 13 are fitted together, the sound piece 16 is fixedly supported in the sound creator pipe 10 by sandwiching the flange portion 16a of the sound piece 16 between them. I'm allowed.

  In addition, the small-diameter portion 15 which is a general portion of the other pipe piece 13 has a plate-like or diaphragm-like shape made of an elastic body such as rubber, which functions as a vibrating body or a sound pressure generation source like the sound piece 16. The sound plate 17 is fixedly supported. The sound plate 17 is inscribed in the small diameter portion 15 of the other pipe piece 13, and the sound plate 17 functions as a partition wall in series with the sound piece 16 due to the presence of the sound plate 17. The inside of the small diameter portion 15 of the other pipe piece 13 is separated into a space on the sound piece 16 side and a space on the open end 10b side, and the respective spaces are independent from each other and on the open end 10b side. The space is open to the outside. If the side on which the intake air pulsation on the side of the intake device 5 directly acts is the upstream side, the sound piece 16 is the upstream vibration body or sound pressure generation source, and the sound plate 17 is the downstream vibration body or sound pressure generation. Each will function as a source.

  Here, when the sound piece 16 and the sound plate 17 both functioning as a vibrating body or a sound pressure generation source are compared with each other, as described above, they are not only different in shape and material but also in the sound plate 17. Is smaller than the diameter of the vibration surface 16c of the sound piece 16, and the sound piece 16 has a bellows portion 16b, whereas the sound plate 17 does not have a bellows portion. . Therefore, the vibration characteristics of both, that is, the resonance frequencies of the sound piece 16 and the sound plate 17 are set to be different from each other.

In the above example , the sound piece 16 is made of resin and the sound plate 17 is made of rubber. However, if any of them functions as a vibrating body or a sound pressure generation source, The material is not particularly limited. Needless to say, the sound piece 16 may have the same plate shape or diaphragm shape as the sound plate 17.

  In addition, since the sound creator pipe 10 as a tubular body provided with the sound piece 16 and the sound plate 17 also functions as a resonance tube, the sound piece 16 and the sound plate 17 can also have different diameters and lengths on the downstream side. The resonance frequency is determined. Specifically, the basic resonance frequency of the sound piece 16 is the tube diameter (inner diameter) or tube length between the position of the sound piece 16 and the position of the sound plate 17 in the sound creator pipe 10, that is, the large diameter portion (expansion chamber). ) 14 and the diameter of the small diameter portion 15 and the tube length. On the other hand, the basic resonance frequency of the sound plate 17 is the tube diameter and length of the sound creator pipe 10 from the position of the sound plate 17 to the open end 10b, that is, the tube diameter of the small diameter portion 15 on the downstream side of the sound plate 17. It will be decided by the pipe length.

  Therefore, according to the intake device 5 configured in this way, as described above, the internal space of one pipe piece 12 of the sound creator pipe 10 communicates with the clean side duct 9 that is the intake passage on the intake device 5 side. As a result, the intake air pulsation of the intake device 5 that is linked to the accelerator opening and thus the engine speed directly reaches the internal space of the pipe piece 12 as an excitation source.

  Here, when attention is paid to the vibration of the sound piece 16 due to the intake pulsation, the vibration surface 16c of the sound piece 16 receives the intake pulsation and vibrates at a specific resonance frequency with the expansion and contraction displacement of the bellows portion 16b. . Among the sound waves (sound pressure) generated by the vibration of the sound piece 16, a sound wave having a predetermined resonance frequency is amplified or emphasized by resonance based on so-called air column resonance in the pipe piece 13 including the large diameter portion 14 and the small diameter portion 15. It will be. Note that, as described above, this air column resonance is downstream of the sound piece 16 and greatly depends on the pipe diameter and the pipe length of the pipe piece 13 up to the sound plate 17. That's right.

  The sound wave amplified or emphasized by the air column resonance is transmitted through the small-diameter portion 15 of the pipe piece 13, and is emitted as an effect sound having a predetermined sound pressure level from the open end 10b of the pipe piece 13 toward the dash panel 2 in FIG. Will be. This sound effect propagates to the dash panel 2 and the like, and is added or superimposed on the intake sound of the intake device 5, and on the cabin side, the sound quality is added and the intake sound with a sense of sport or power Can be obtained.

  On the other hand, when attention is paid to the vibration of the sound plate 17 on the downstream side of the sound piece 16, the sound plate 17 has a specific resonance frequency different from the vibration of the sound piece 16 due to the intake pulsation of the intake device 5 as the excitation source. Vibrates under the ground. Among the sound waves (sound pressure) generated by the vibration of the sound plate 17, a sound wave having a predetermined resonance frequency is amplified or emphasized by resonance based on so-called air column resonance in the small diameter portion 15 of the pipe piece 13 on the downstream side of the sound plate 17. Will be.

  Thereafter, as in the previous case, the sound wave amplified or emphasized by the air column resonance is transmitted through the small-diameter portion 15 of the pipe piece 13, and is transmitted from the open end 10b of the pipe piece 13 to the dash panel 2 or the like as a sound effect of a predetermined sound pressure. Will be released. This sound effect is propagated to the dash panel 2 and the like, and is added or superimposed on the intake sound of the intake device 5. A powerful intake sound can be obtained.

As described above , according to the above structure , a plurality of sound waves having different frequencies can be individually amplified or emphasized and added or superimposed on the intake sound of the intake system as a sound effect. It is extremely good for experiencing the added inspiration sound with a sense of sport or power.

  Further, by appropriately selecting and tuning the shape and material of the sound piece 16 and the sound plate 17 and the pipe diameters and lengths of the pipe pieces 12 and 13, a plurality of different frequencies in the target engine speed range can be obtained. It is possible to individually add or superimpose the sound effect on the intake sound of the intake device 5.

Further, the air column resonance based on the vibration of the sound piece 16 is greatly affected by the diameters and lengths of the large diameter portion 14 and the small diameter portion 15 of the pipe piece 13 on the downstream side of the sound piece 16. As described above, resonance based on vibration is greatly affected by the tube diameter and the tube length of the small-diameter portion 15 of the pipe piece 13 on the downstream side of the sound plate 17. In addition, the structure described above is a vibration source because the sound piece 16 and the sound plate 17 as vibration sources in series in the longitudinal direction of the sound creator pipe 10 are independent and greatly separated from each other. Tuning of the resonance frequency based on the difference in position between the sound piece 16 and the sound plate 17 can be fully reflected.

  In other words, the sound effect of the fundamental resonance frequency created based on the tube diameter and the tube length on the downstream side of the sound piece 16 as the vibrating body in the sound creator pipe 10 and the downstream of the sound plate 17 as the vibrating body. The sound effect of the fundamental frequency created based on the tube diameter and the tube length on the side is further excited by the vibration accompanying the intake pulsation of the sound piece 16 and the sound plate 17, resulting in an increase of the sound effect of each frequency. I will let you. Therefore, a plurality of sound effects having predetermined sound pressure levels with different frequencies can be created individually and more fully, and further improvement in sound quality (sound pressure) addition effect can be expected.

FIG. 3 is a diagram showing a modification of FIG . 2, and parts common to FIG. 2 are given the same reference numerals.

In this modification , as shown in FIG. 3, the length of the small diameter portion 15 of the pipe piece 13 which is a part of the sound creator pipe 10 that also functions as a resonance tube is set longer than that of FIG. In the small diameter portion 15, another sound plate 18 identical to the sound plate 17 is arranged on the upstream side of the sound plate 17 as a vibrating body. However, it is of course possible to make the thickness and material of the sound plate 18 different from those of the sound plate 17 in order to make the vibration characteristics of the sound plate 18 different from that of the sound plate 17.

According to this structure , it is created based on the sound effect of a specific fundamental frequency created based on the pipe diameter and pipe length on the downstream side of the sound piece 16 and the pipe diameter and pipe length on the downstream side of the sound plate 17. In addition to the sound effect of a specific fundamental frequency, a sound effect of a specific fundamental frequency created based on the tube diameter and the tube length between the sound plates 17 and 18 is created. As a result, a further improvement in sound quality (sound pressure) addition effect can be expected.

Figure 4-6 is a diagram illustrating a form of implementation of the intake equipment according to the present invention, parts in common with the structure of FIG. 3 are denoted by the same reference numerals.

In this embodiment, on the premise of the structure of FIG. 3, as shown in FIG. 4, the sound plates 17 and 18 as vibrating bodies inscribed in the small diameter portion 15 that is a general portion of the other pipe piece 13 are provided. A shaft body 19 or 20 is rotatably supported on the other pipe piece 13 to form a so-called butterfly valve.

  More specifically, as shown in FIG. 6, hinge brackets 21a and 21b are arranged oppositely on the outer side of the small diameter portion 15 of the other pipe piece 13, and are attached to the hinge brackets 21a and 21b side. The shafts 19 and 20 are inserted into the corresponding holes on the sound plates 17 and 18, respectively, so that the sound plates 17 and 18 are rotatably supported, and the sound plates 17 and 18 are independently supported. The structure can be opened and closed. The shafts 19 and 20 of the sound plates 17 and 18 are connected to mutually independent electric motors and other actuators 22 and 23, and the sound plates 17 and 18 can be individually opened and closed by the activation of the actuators 22 and 23. It has become.

  Here, the actuators 22 and 23 can be activated individually or simultaneously in accordance with, for example, a predetermined accelerator opening degree or engine speed set in advance. Therefore, as long as such a function can be realized, as the actuators 22 and 23, an electric motor, a negative pressure actuator, and other arbitrary ones can be used.

  4 shows a state in which both sound plates 17 and 18 are closed, while FIG. 5 shows a state in which both sound plates 17 and 18 are both open. Further, FIG. 6 shows a state where the upstream sound plate 18 is open and the downstream sound plate 17 is closed.

Therefore, in this embodiment , as shown in FIG. 4, when both the sound plates 17 and 18 are closed, these sound plates 17 and 18 are respectively vibration sources as in FIG. As a result, the same function as that shown in FIG. 3 is exhibited, and three types of sound effects with different sound pressure levels having different frequencies can be added or superimposed on the intake sound. It becomes.

  On the other hand, as shown in FIGS. 5 and 6, at least one of the sound plates 17 or 18 or both of the sound plates 17 and 18 is opened according to the engine speed, so that at least the sound plate 17 in the open state is opened. Or 18 or 17, 18 does not function as a vibration source. As a result, when one of the sound plates 17 or 18 or both of the sound plates 17 and 18 are opened, the sound creator pipe 10 has a sound quality under a behavior different from that shown in FIG. Sound pressure) Additional function is demonstrated.

  For example, when both the sound plates 17 and 18 are open as shown in FIG. 5, as described above, both the sound plates 17 and 18 are substantially as vibration sources or sound pressure generation sources. Since it does not function, only the sound piece 16 functions as a vibration source or a sound pressure generation source. In this case, the fundamental frequency of the sound effect having a predetermined sound pressure level created based on the vibration of the sound piece 16 is based on the pipe diameter and the pipe length on the downstream side of the sound piece 16, in other words, both. It is determined based on the pipe diameter and pipe length equivalent to the case where the sound plates 17 and 18 are not present. However, both the open sound plates 17 and 18 that do not function as a vibrating body or a sound pressure generation source function only as additional weight (mass) attached to the pipe piece 13.

  On the other hand, as shown in FIG. 6, when only the upstream sound plate 18 is open, the open sound plate 18 does not substantially function as a vibration source or a sound pressure generation source. Only the downstream sound plate 17 functions as a vibration source or a sound pressure generation source. In this case, the fundamental frequency of the sound effect having a predetermined sound pressure level created based on the vibration of the sound piece 16 is based on the pipe diameter and the pipe length on the downstream side of the sound piece 16, in other words, the sound. It is determined based on the pipe diameter and pipe length from the piece 16 to the downstream sound plate 17. Similarly, the fundamental frequency of the sound effect having a predetermined sound pressure level created based on the vibration of the sound plate 17 is determined based on the pipe diameter and the pipe length on the downstream side of the sound plate 17. Even in these cases, the open sound plate 18 that does not function as a vibrating body functions only as an additional weight (mass) attached to the pipe piece 13.

  Of course, instead of opening the upstream sound plate 18 as shown in FIG. 6, it is also possible to close the upstream sound plate 18 and open the downstream sound plate 17. In this case, the fundamental frequency of the sound effect having a predetermined sound pressure level created based on the vibration of the sound plate 18 is based on the pipe diameter and the pipe length on the downstream side of the sound plate 18, in other words, the sound plate. It is determined based on the tube diameter and the tube length from 18 to the open end 10b.

  As described above, according to the present embodiment, it is possible not only to add or superimpose three kinds of sound effects having predetermined sound pressure levels having different frequencies or sound quality to the intake sound, but also by the actuators 22 and 23, respectively. By adjusting the timing for opening and closing the sound plates 17 and 18, the sound quality of the sound effect to be added or superimposed on the intake sound can be changed at an arbitrary engine speed.

In the above embodiment, two sound plates are provided to add or superimpose sound effects of predetermined sound pressure levels with different frequencies or sound quality. However, the number of sound plates is not limited, and the desired number of sound plates is not limited. The sound plate can be provided.

5 ... Intake device (intake system)
9 ... Clean side duct 10 ... Sound creator pipe (tubular body)
12 ... Pipe piece 13 ... Pipe piece 14 ... Large diameter part (expansion chamber)
16 ... Sound piece (vibrating body)
16b ... Bellows part 17 ... Sound plate (vibrating body)

Claims (4)

The tubular body as well as connected to an intake system of an internal combustion engine, Ri tare arranged partition walls form a plurality of vibrators to vibrate in response to the intake pulsation of the internal to the intake system of the tubular body in series,
The above vibrating body isolates the inside of the tubular body into the intake system side and the anti-intake system side in the longitudinal direction, and the vibrating body other than the upstream vibrating body closest to the intake system side can turn to the tubular body And is supported by
An actuator is provided for rotating this rotatable vibrating body,
An intake system for an internal combustion engine characterized by Thea Rukoto to allow opening and closing the conduit of the tubular body with the rotation of the rotatable vibrator. The longitudinal intermediate portion of the tubular body is an expansion chamber having a large tube diameter locally, and an upstream vibration body closest to the intake system side is disposed in the expansion chamber. 2. An intake device for an internal combustion engine according to 1. The intake device for an internal combustion engine according to claim 2, wherein the upstream vibrating body closest to the intake system side has a bottomed cylindrical shape with one end closed and a bellows shape . Yes disposed two vibrator in addition to the vibration of the closest upstream to the intake system side, these two vibrating body is characterized in that which had been supported rotatably separately to the tubular body according to claim 1 The intake device for an internal combustion engine according to any one of ?

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