JP4024127B2 - Exhaust device for internal combustion engine - Google Patents

Exhaust device for internal combustion engine Download PDF

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Publication number
JP4024127B2
JP4024127B2 JP2002314553A JP2002314553A JP4024127B2 JP 4024127 B2 JP4024127 B2 JP 4024127B2 JP 2002314553 A JP2002314553 A JP 2002314553A JP 2002314553 A JP2002314553 A JP 2002314553A JP 4024127 B2 JP4024127 B2 JP 4024127B2
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Japan
Prior art keywords
exhaust
purification
pipe
chamber
outlet
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Expired - Fee Related
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JP2002314553A
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Japanese (ja)
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JP2004150310A (en
Inventor
雄一郎 森川
英一 石川
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本田技研工業株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to an exhaust device for an internal combustion engine including an exhaust purification device and an exhaust muffler provided in the middle of an exhaust pipe.
[0002]
[Prior art]
  As an exhaust device in which an exhaust purification device for purifying exhaust gas of an internal combustion engine is provided in the middle of an exhaust pipe, for example, there is one disclosed in Patent Document 1. In this exhaust device, a main catalyst and a sub catalyst for purifying exhaust gas are provided in the middle of the exhaust pipe. Each catalyst is accommodated in an accommodating portion having a diameter larger than the diameter of the exhaust pipe positioned on the upstream side and the downstream side, respectively. Therefore, the upstream portion of the accommodating portion is formed as a divergent portion whose flow area increases toward the downstream side of the exhaust gas, and the downstream portion of the accommodating portion decreases in the flow area toward the downstream side of the exhaust gas. Formed in the convergent part.
[0003]
  Further, as an exhaust device provided with a hole through which exhaust gas flows out in the middle of the exhaust pipe, there are those disclosed in Patent Document 2 and Patent Document 3, for example. In the muffler disclosed in Patent Document 2, the rear portion of the exhaust pipe inserted into the first expansion chamber is fitted to the diffuser pipe held in the first expansion chamber of the muffler, and the exhaust pipe is opened to the first expansion chamber. An adjustment hole is provided. The adjustment hole corrects the trough of the output when a high output is obtained in a specific rotation region using the exhaust pulsation wave.
[0004]
  Further, in the exhaust silencer disclosed in Patent Document 3, a through pipe connecting the exhaust inlet and the exhaust outlet is connected to the exhaust pipe connected to the exhaust inlet of the silencer. The through pipe includes a tapered portion located in the front silencing chamber and a straight pipe portion extending from the tapered portion to the exhaust outlet. The taper portion is provided with a number of through holes communicating with the front silencing chamber, and the straight pipe portion is alternately opened and closed with a valve hole communicating with the intermediate silencing chamber and the valve hole and the straight pipe portion. A switching valve is provided. When the switching valve shuts off the straight pipe portion, the exhaust gas from the exhaust pipe flows out to the front silencing chamber through a number of through holes, and further passes through the rear silencing chamber and then the intermediate silencing chamber, and the exhaust outlet To reach. In addition, when the switching valve partially opens the straight pipe part, some exhaust gas flows out from many through holes and sequentially passes through the front silencing chamber, the rear silencing chamber and the intermediate silencing chamber to the exhaust outlet. The remaining exhaust gas reaches the exhaust outlet only through the through pipe.
[0005]
[Patent Document 1]
          JP 2000-204931 A
[Patent Document 2]
          Japanese Patent No. 2737079
[Patent Document 3]
          JP-A-2-81911
[0006]
[Problems to be solved by the invention]
  By using exhaust pulsation based on the reflected pressure wave generated in the exhaust pipe that forms the exhaust passage, it is often possible to increase the engine output by improving exhaust efficiency or preventing or suppressing the blowout of fresh air Are known. In that case, it is necessary to appropriately set the position in the exhaust passage where the reflected pressure wave is generated in the exhaust pipe so that the generated reflected pressure wave reaches the exhaust port of the exhaust port at an appropriate time.
[0007]
  By the way, when an exhaust purification device is provided in the middle of an exhaust pipe, it is necessary to secure a passage for exhaust gas in a purification element of the exhaust purification device (for example, the catalyst of Patent Document 1 corresponds). As in the prior art of No. 1, the exhaust emission control device has a divergent portion where a negative reflected pressure wave is generated and a convergent portion where a positive reflected pressure wave is generated. And, generally, the negative reflected pressure wave contributes to the improvement of exhaust efficiency because it promotes the outflow of exhaust gas, whereas the positive reflected pressure wave suppresses the outflow of exhaust gas, When the position of the generation site in the exhaust passage is appropriately set, the blowout of fresh air is suppressed, but otherwise, the exhaust efficiency tends to be reduced.
[0008]
  Therefore, in an exhaust system provided with an exhaust purification device having a purification element, in order to increase exhaust efficiency and consequently engine output using exhaust pulsation, a divergent part and a convergent part, which are parts where reflected pressure waves are generated, particularly It is necessary to appropriately set the position of the convergent portion in the exhaust passage that generates a positive reflected pressure wave that lowers the exhaust efficiency.
[0009]
  However, the installation location of the exhaust purification device is, for example, a location as close as possible to the exhaust port where the temperature of the exhaust gas is kept high so that the catalyst reaches the activation temperature early, while considering the layout on the vehicle body, It is often set from the viewpoint of ensuring good purification performance, such as where it is easy to maintain the activation temperature of the catalyst. For this reason, the convergent portion where the positive reflected pressure wave is generated is rarely provided at a position where the blowout of fresh air is suppressed and the engine output is increased. In many cases, the emission was hindered, the exhaust efficiency was lowered, and the engine output was lowered.
[0010]
  Further, the positive reflected pressure wave generated by the convergent part increases the pressure (back pressure) immediately downstream of the purification element, and the flow rate of exhaust gas in the purification element decreases or the distribution of the flow rate is not stable. It became uniform and the purification performance of the exhaust purification device was reduced.
[0011]
  Further, the prior arts of Patent Documents 2 and 3 are provided with holes in the exhaust pipe or the tapered portion of the through pipe connected to the exhaust pipe, but none of them is provided with an exhaust purification device. There are no holes provided in connection with the purification device.
[0012]
  The present invention has been made in view of such circumstances., ExhaustIn an internal combustion engine having an exhaust device provided with an exhaust gas purification device in the middle of a trachea, an object is to increase engine output and improve the purification performance of the exhaust gas purification device.The
[0013]
[Means for Solving the Problems and Effects of the Invention]
  The invention according to claim 1 includes an exhaust muffler, an exhaust pipe provided between an exhaust port of an internal combustion engine and a sound deadening space of the exhaust muffler, and an exhaust purification device provided in the middle of the exhaust pipe. The exhaust pipe has an upstream exhaust pipe and a downstream exhaust pipe respectively disposed upstream and downstream of the exhaust purification device, and the exhaust purification device flows the purification element and the exhaust gas into the purification element. In an exhaust system for an internal combustion engine having an inlet portion that forms an inlet passage and an outlet portion that forms an outlet passage through which purified exhaust gas flows out of the purification element,The silencing space is composed of a plurality of silencing chambers partitioned by a partition wall, the purification element is disposed in the silencing chamber, and the downstream exhaust pipe passes through the partition wall and the silencing element is disposed. The U-shaped curved pipe portion is formed and extended in the noise reduction chamber different from the chamber, and then extends again in the noise reduction chamber in which the purification element is disposed through the partition wall again. The outlet of the pipe is opened closer to the inlet portion than the outlet portion in the muffler chamber where the purification element is disposed,The outlet portion has a convergent portion whose flow area decreases toward the downstream side of the exhaust gas, and the outlet portion or the upstream end portion of the downstream side exhaust pipe allows a part of the exhaust gas to flow out. Or it is an exhaust device of an internal combustion engine provided with a plurality of leak passages.
[0014]
  As a result, a part of the exhaust gas flowing through the outlet portion or the upstream end portion of the downstream exhaust pipe flows out through the leak passage, and the pressure of the exhaust gas downstream from the purification element is reduced. A negative reflected pressure wave is generated in the portion, and the positive reflected pressure wave generated in the convergent portion is attenuated by the negative reflected pressure wave generated in the convergent portion or a portion close to the convergent portion. For this reason, it is suppressed that the positive reflected pressure wave inhibits the flow of the exhaust gas, the back pressure in the exhaust purification device is further reduced, and a decrease in the flow rate of the exhaust gas in the exhaust purification device is suppressed.
[0015]
  As a result, according to the first aspect of the present invention, the following effects can be obtained. That is, the exhaust gas purification device provided between the upstream side exhaust pipe and the downstream side exhaust pipe has a convergent part at the outlet part, and the exhaust part is provided with an exhaust part at the upstream end side part of the outlet part or the downstream side exhaust pipe. There was one or more leak passages that let some of the gas flow out.thingAs a result, the pressure of the exhaust gas downstream from the purification element of the exhaust purification device decreases, and the positive reflected pressure wave generated in the convergent portion is attenuated, so the exhaust device provided with the exhaust purification device in the middle of the exhaust pipe In the internal combustion engine having the above, the exhaust efficiency is improved and the engine output is increased. In addition, since the reduction in the flow rate of the exhaust gas in the exhaust purification device due to the positive reflected pressure wave is suppressed, the purification performance of the exhaust purification device is improved.
[0016]
  In this specification, “upstream” and “downstream” mean “upstream” and “downstream” with respect to the flow of exhaust gas, respectively, and “flow” means the flow of exhaust gas.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described with reference to FIGS.
  Referring to FIG. 1 showing a first embodiment of the present invention, an exhaust device E to which the present invention is applied is an exhaust device for a single-cylinder four-cycle internal combustion engine (not shown) mounted on a motorcycle or a small vehicle. It is. An exhaust device E that purifies exhaust gas, which is combustion gas discharged from a combustion chamber of the internal combustion engine having a piston that reciprocates in a cylinder, and discharges it into the atmosphere, in order from the upstream to the downstream of the exhaust gas, in order An introduction pipe (not shown) connected to the exhaust port of the internal combustion engine, a first exhaust pipe 1 that is an upstream exhaust pipe connected to the introduction pipe, and an exhaust purification device connected to the first exhaust pipe 1 3, a second exhaust pipe 2, which is a downstream exhaust pipe connected to the exhaust purification device 3, an exhaust muffler 4 in which a silencing space S opened by the second exhaust pipe 2 is formed, and the silencing space S is opened. And a tail pipe 6 having an inlet 6a and an outlet 6b opened to the atmosphere.
[0018]
  Therefore, the exhaust pipe P constituted by the first exhaust pipe 1 and the second exhaust pipe 2 provided with the exhaust purification device 3 sandwiched therebetween and the introduction pipe is provided between the exhaust port and the silencing space S. . The exhaust purification device 3 is provided in the middle of the exhaust pipe P as close to the exhaust port as possible so that exhaust gas having a relatively high temperature flows into the exhaust purification device 3 in consideration of the layout in the vehicle body. It is done.
[0019]
  The exhaust muffler 4 includes an outer wall 40 and partition walls that divide the silence space S formed inside the outer wall 40 into a plurality of silence chambers. In the first embodiment, the first and second partition walls 41 and 42 are a plurality of partition walls. And comprising. The silencing space S is divided into three first, second, and third silencing chambers 45, 46, and 47 that form expansion chambers by the first and second partition walls 41 and 42, respectively.
[0020]
  Specifically, the outer wall 40 has a cylindrical shape, in this embodiment, a cylindrical central portion 40a, a first end portion 40b on one end side in the longitudinal direction of the central portion 40a, and a longitudinal direction of the central portion 40a. The second end 40c on the other end side. Inside the central portion 40a, an inner wall 40d that forms a double wall structure in cooperation with the central portion 40a is provided, and a sound absorbing material 40e made of, for example, glass wool is filled between the central portion 40a and the inner wall 40d. .
[0021]
  A first silencing chamber 45 is formed by the central portion 40a, the first partition 41, and the second partition 42, and second and third silencing chambers 46 and 47 are formed with the first silencing chamber 45 interposed therebetween. That is, the second silencing chamber 46 is formed by one end portion of the central portion 40a, the first end portion 40b, and the first partition wall 41, and the third silencing chamber 47 is formed by the other end portion of the central portion 40a and the second end portion 40c. The second partition wall 42 is formed.
[0022]
  The first to third silencing chambers 45 to 47, which are sequentially positioned from upstream to downstream of the flow of exhaust gas in the silencing space S, are communication pipes that connect adjacent silencing chambers along the flow. The first and second communication pipes 49 and 50 are a plurality of communication pipes. The first communication pipe 49 is disposed through the first partition wall 41 and has an inlet 49 a that opens to the first silencing chamber 45 and an outlet 49 b that opens to the second silencing chamber 46. The second communication pipe 50 is disposed through the first partition 41, the first silencing chamber 45, and the second partition 42, and has an inlet 50 a that opens to the second silencing chamber 46 and an opening to the third silencing chamber 47. Outlet 50b.
[0023]
  The first exhaust pipe 1 connected to the introduction pipe outside the exhaust muffler 4 is disposed through the first end 40b, the second silencer chamber 46, and the first partition wall 41, and is disposed in the first silencer chamber 45. To the inlet 33 of the exhaust gas purification device 3. On the other hand, the second exhaust pipe 2 connected to the outlet 34 of the exhaust purification device 3 in the first silencing chamber 45 passes through the second partition wall 42 and is a U-shaped curved pipe in the third silencing chamber 47. The first partition wall 42 is formed so as to extend through the second partition wall 42 to the vicinity of the first partition wall 41 in the first silencing chamber 45. The outlet 2b of the second exhaust pipe 2 is located close to the first partition 41 and opens to the first silencing chamber 45 opposite the first partition 41.
The tail pipe 6 has an inlet 6a that is disposed through the second end portion 40c and opens to the third silencing chamber 47 that is located most downstream in the flow of exhaust gas.
[0024]
  Therefore, the entire second exhaust pipe 2 is disposed in the first and third silencing chambers 45 and 47, and the entire exhaust purification apparatus 3 is the first silencing chamber in which the outlet 2b of the second exhaust pipe 2 is opened. Located in 45. This exhaust purification device 3 is a substance that purifies exhaust gas by detoxifying harmful components in exhaust gas, in this embodiment NOx (nitrogen oxide), HC (hydrocarbon) and CO (carbon monoxide) in the exhaust gas. ), And a casing 31 that accommodates the catalyst unit 30. Therefore, the catalyst unit 30 constitutes a purification element that purifies the exhaust gas.
[0025]
  Thus, the exhaust purification device 3 having a three-way catalyst is arranged in the exhaust muffler 4 in the middle of the first and second exhaust pipes 1 and 2 constituting the exhaust pipe P, so that the catalyst is The time required to reach the activation temperature can be shortened, and the exhaust purification device 3 is kept warm in the exhaust muffler 4.
[0026]
  The casing 31 includes a holding portion 32 that holds the catalyst portion 30, and an inlet that forms an inlet passage 35 that is located upstream of the inlet end 30a of the catalyst portion 30 in order to guide the exhaust gas from the exhaust port to the catalyst portion 30. 33 and the outlet end of the catalyst unit 30 for guiding the exhaust gas purified by the catalyst unit 30 to the inlet of the second exhaust pipe 230bAnd an outlet portion 34 that forms an outlet passage 36 that is located further downstream.
[0027]
  The holding part 32 is configured by a part of a cylindrical main pipe 37 having a larger inner diameter than the first and second exhaust pipes 1 and 2 and forming a substantially constant flow path area along the flow. The inlet portion 33 is composed of a tapered tube 38 that forms a divergent portion that is connected to the main tube 37 and increases in flow path area toward the downstream side, and an upstream end portion 37a that is a part of the main tube 37. The outlet portion 34 is configured by a tapered tube 39 that is connected to the main tube 37 and forms a convergent portion whose flow path area decreases toward the downstream side, and a downstream end portion 37b that is a part of the main tube 37.
  Then, as shown in FIG. 30 Is the first silencer 45 The second exhaust pipe 2 is disposed in the first silencer chamber. 45 Third silencer room separate from 47 A U-shaped bent tube portion is formed inside. And the exit 2b is a catalyst part. 30 1st muffler room with 45 Within the exit part 34 Than the entrance 33 Open on the side.
[0028]
  The taper tube 39 is formed with a leak hole 7 constituting a leak passage for allowing a part of the exhaust gas passing through the outlet passage 36 to flow into the first silencing chamber 45 so as to have an outlet opening to the first silencing chamber 45. The A plurality of, here six, leak holes 7 are formed in the tapered tube 39 from a portion located near the inlet end 39a of the tapered tube 39, that is, a portion closer to the inlet end 39a than the outlet end 39b of the tapered tube 39. Are formed at substantially equal intervals in the circumferential direction, preferably in the vicinity of the inlet end 39a. Therefore, in the tapered pipe 39, the leak hole 7 is formed in the downstream side portion 39d composed of a portion located closer to the outlet end 39b than the inlet end 39a and a portion located intermediate between the inlet end 39a and the outlet end 39b. Not formed.
[0029]
  In the first silencing chamber 45, the leak hole 7 is located close to the second partition wall 42. Therefore, the leak hole 7 is located in the longitudinal direction in the first silencing chamber 45 from the outlet 2b of the second exhaust pipe 2 that is located in the vicinity of the first partition wall 41 and that opens to face the first partition wall 41. Are located apart.
[0030]
  Next, the operation and effect of the first embodiment configured as described above will be described.
  The exhaust gas flowing out from the exhaust port when the internal combustion engine is operated flows into the exhaust purification device 3 through the introduction pipe and the first exhaust pipe 1, and the exhaust gas purified by the exhaust purification device 3 is , Flows into the first silencing chamber 45 through the second exhaust pipe 2. The exhaust gas that has been decompressed and muffled by expanding in the first muffler chamber 45 flows into the second muffler chamber 46 through the first communication passage 49, and further flows from the second muffler chamber 46 to the second communication chamber. It flows into the third silencing chamber 47 through the pipe 50.
[0031]
  At this time, the exhaust gas is decompressed and silenced by expanding in the second silencing chamber 46 and the third silencing chamber 47, respectively. In this way, the exhaust gas that has been sufficiently silenced is discharged from the third silencing chamber 47 through the tail pipe 6 into the outside air. Therefore, the magnitude of the pressure and the magnitude of the exhaust pulsation in the first to third silencing chambers 45 to 47 are set so that the silencing chamber located downstream, that is, the first silencing chamber 45, the second silencing chamber 46, and the third silencing chamber. Chamber 47 becomes smaller in order.
[0032]
  Further, when the internal combustion engine is operated from a cold state, the exhaust purification device 3 including the catalyst unit 30 is provided between the first exhaust pipe 1 and the second exhaust pipe 2 at a position relatively close to the exhaust port. As a result, the catalyst of the exhaust purification device 3 can be heated with a relatively high temperature exhaust gas so as to reach the activation temperature at an early stage, and the exhaust purification device 3 is disposed in the exhaust muffler 4, thereby Therefore, it becomes easy to maintain the activation temperature of the catalyst, and good purification performance can be ensured.
[0033]
  A leak hole 7 through which a part of the exhaust gas purified in the taper tube 39 flows out is provided in the upstream portion 39c of the taper tube 39 constituting the convergent portion of the exhaust purification device 3, preferably in the vicinity of the inlet end 39a. As a result, a part of the exhaust gas in the outlet passage 36 flows out through the leak hole 7, the pressure of the exhaust gas downstream from the catalyst unit 30 is reduced, and a negative reflection occurs in the leak hole 7 part. A pressure wave is generated, and the leak hole 7 is located upstream of the tapered tube 39 at a position close to the inlet end 39a where a strong positive reflected pressure wave is generated due to a large change in flow path area. Since it is located in the vicinity of the side 39c, preferably the inlet end 39a, the positive reflected pressure wave generated in the taper tube 39 is effectively attenuated. Further, the closer the leak hole 7 is to the inlet end 39a, the more effective is the attenuation of the positive reflected pressure wave.
[0034]
  In this way, the pressure of the exhaust gas downstream from the catalyst unit 30 decreases and the positive reflected pressure wave generated in the taper pipe 39 is attenuated. Therefore, the exhaust gas in which the exhaust purification device 3 is provided in the middle of the exhaust pipe P In the internal combustion engine provided with the device E, the exhaust efficiency is improved and the engine output is increased. In addition, since the decrease in the flow rate of the exhaust gas in the exhaust purification device 3 due to the positive reflected pressure wave is suppressed, the purification performance of the exhaust purification device 3 is improved. Furthermore, the six leak holes 7 are formed at substantially equal intervals in the circumferential direction, so that the distribution of the flow velocity is made uniform, and the purification performance of the exhaust purification device 3 is improved in this respect as well.
[0035]
  Further, since the leak hole 7 is disposed in the first silencing chamber 45 away from the outlet 2b of the second exhaust pipe 2 in the longitudinal direction, the outflow of exhaust gas from the leak hole 7 can be prevented from flowing out the outlet 2b. It is avoided as much as possible that it is obstructed by the high pressure wave of the exhaust gas flowing out of the exhaust gas.
[0036]
  Since the exhaust purification device 3 is disposed in the first silencing chamber 45 constituting the silencing space S, the exhaust gas from the leak hole 7 flows into the first silencing chamber 45 and is depressurized. Since the pressure is reduced and silenced in the third silencing chambers 46 and 47, the exhaust noise generated by the exhaust gas flowing out from the leak hole 7 is reduced. In addition, since the exhaust muffler 4 serves as a protective member for the exhaust purification device 3 and the second exhaust pipe 2, the exhaust purification device 3 in which the driver and obstacles are heated by reaction heat, and the 2 It is possible to reliably prevent contact with the exhaust pipe 2 without increasing the number of parts such as providing a protective member separately.
[0037]
  Further, in the first to third silencing chambers 45 to 47 constituting the silencing space S of the exhaust muffler 4, both the outlet of the leak hole 7 and the outlet 2 b of the second exhaust pipe 2 are opened to the first silencing chamber 45. Since the sound deadening chamber for reducing the exhaust noise caused by the exhaust gas flowing out from the second exhaust pipe 2 and the leak hole 7 is shared, it is possible to avoid the enlargement of the exhaust muffler 4 and the complexity of its internal structure. Thus, the cost of the exhaust device E can be reduced.
[0038]
  The leak hole 7 is formed in the upstream side portion 39c of the tapered tube 39 and is not formed in the downstream side portion 39d, so that the strength of the tapered tube 39 is prevented from being lowered.
  Further, the second exhaust pipe 2 extends through the third silencing chamber 47 to the first silencing chamber 45, so that the exhaust inertia effect at the time of low speed rotation of the internal combustion engine using the exhaust pipe P having a long passage length is used. Therefore, the required engine output can be ensured even during low-speed rotation.
[0039]
  Next, the second and third embodiments of the present invention will be described with reference to FIGS. The second and third embodiments are different from the first embodiment mainly in the sound deadening chamber of the exhaust gas flowing out through the leak hole 7, and the other components are basically the same. . Therefore, description of the same part is omitted or simplified, and different points will be mainly described. In addition, the same code | symbol was used about the member same as the member of 1st Example, or a corresponding member.
[0040]
  Referring to FIG. 2 showing the second embodiment, the outlet portion 34 including the taper tube 39 is disposed in the third silencing chamber, and the leak hole 7 has the smallest exhaust pulsation in the silencing chamber constituting the silencing space S. Open to the third silencing chamber 47. Therefore, the exhaust purification apparatus 3 is disposed across the first silencing chamber 45 and the third silencing chamber 47 through the second partition wall 42.
[0041]
  According to the second embodiment, the same operations and effects as the first embodiment are exhibited, and the following operations and effects are also achieved. That is, in the first to third silencing chambers 45 to 47 constituting the silencing space S of the exhaust muffler 4, the outlet of the leak hole 7 is a silencing chamber different from the first silencing chamber 45, and includes the first to third silencing chambers 45 to 47. By opening to the third silencing chamber 47 located on the most downstream side among the silencing chambers 45 to 47, the exhaust gas from the leak hole 7 has a high pressure due to the exhaust gas from the second exhaust pipe 2 flowing out. In addition, it flows out into the third silencing chamber 47 which is a silencing chamber different from the first silencing chamber 45 where large exhaust pulsation exists. The third silencing chamber 47 is the silencing chamber having the lowest pressure and the smallest exhaust pulsation among the first to third silencing chambers 45 to 47 formed in the exhaust muffler 4. Positive reflected pressure waves are further attenuated. As a result, the inhibition of the exhaust gas flow caused by the positive reflected pressure wave is further suppressed, so that the exhaust efficiency is further improved and the engine output is further increased. In addition, a decrease in the flow rate of the exhaust gas in the exhaust purification device 3 due to the positive reflected pressure wave is further suppressed, and the purification performance of the exhaust purification device 3 is further improved.
[0042]
  Next, referring to FIG. 3 showing the third embodiment, the exhaust muffler 4 is provided with a third partition wall 43 between the first and second partition walls 41 and 42, and the third partition wall 43 serves as a first silencing chamber. A fourth silencing chamber 48 as an independent expansion chamber is formed between the 45 and the third silencing chamber 47 without communicating with the silencing chamber. The fourth silencing chamber 48 communicates with the outside air through one or more discharge pipes 44. Therefore, the pressure in the fourth silencing chamber 48 is lower than that in the third silencing chamber 47, and the exhaust pulsation in the fourth silencing chamber 48 is much smaller than the exhaust pulsation in the third silencing chamber 47 or hardly exists. .
[0043]
  The outlet 34 including the tapered tube 39 is disposed in the fourth silencing chamber 48 constituting the silencing space S, and the leak hole 7 opens to the fourth silencing chamber 48. Therefore, the exhaust purification device 3 is arranged across the first silencing chamber 45 and the fourth silencing chamber 48 through the third partition wall 43.
[0044]
  According to the third embodiment, the same operations and effects as the first embodiment are achieved, and the following effects are also achieved. That is, the fourth silencing chamber 48 is lower in pressure than the third silencing chamber 47, is close to the external pressure, and has very little or no exhaust pulsation, so that a positive reflected pressure wave at the taper tube 39 is generated in the second embodiment. It is further attenuated compared to the example. As a result, from the effect of the second embodiment, the engine output is increased by improving the exhaust efficiency, and the purification performance of the exhaust purification apparatus 3 is improved by suppressing the decrease in the flow rate of the exhaust gas in the exhaust purification apparatus 3. Also has an excellent effect.
[0045]
  Next, a fourth embodiment of the present invention will be described with reference to FIGS. Here, description of the same parts as those in the first embodiment will be omitted or simplified, and different points will be mainly described. In addition, the same code | symbol was used about the member same as the member of 1st Example, or a corresponding member.
[0046]
  4 and 5, the exhaust device E includes a first exhaust pipe 1 connected to the introduction pipe connected to the exhaust port of the internal combustion engine, an exhaust purification device 3, and a second exhaust pipe 2. And an exhaust muffler 4 in which a silencing space S in which the second exhaust pipe 2 is opened, and a tail pipe 6 having an inlet 6a opened in the silencing space S and an outlet 6b opened in the atmosphere.
[0047]
  The exhaust muffler 4 includes first and second partition walls 41 and 42 that are a plurality of partition walls. The silencing space S is divided into three first, second and third silencing chambers 45 to 47 by the first and second partition walls 41 and 42. The central portion 40a of the casing 40, the first partition wall 41, and the second partition wall 42 form a third silencing chamber 47 that is located at the most downstream side in the exhaust gas flow. First and second silencing chambers 45 and 46 are formed. That is, the first silencing chamber 45 is formed by one end portion of the central portion 40a, the first end portion 40b, and the first partition wall 41, and the second silencing chamber 46 is formed by the other end portion of the central portion 40a and the second end portion 40c. The second partition wall 42 is formed.
[0048]
  The first to third silencing chambers 45 to 47, which are sequentially positioned along the upstream to downstream of the flow of exhaust gas in the silencing space S, communicate with the first and second silencing chambers adjacent to each other along the flow. Tubes 49 and 50 are provided. The first communication pipe 49 is disposed through the first partition wall 41, the third silencer chamber 45, and the second partition wall 42, and opens to the second silencer chamber 46 and the inlet 49 a that opens to the first silencer chamber 45. Outlet 49b. The second communication pipe 50 is disposed through the second partition wall 42 and has an inlet 50 a that opens to the second silencing chamber 46 and an outlet 50 b that opens to the third silencing chamber 47.
[0049]
  The first exhaust pipe 1 connected to the introduction pipe outside the exhaust muffler 4 is disposed through the first end 40b, and is connected to the inlet 33 of the exhaust purification device 3 in the first silencing chamber 45. Is done. On the other hand, the second exhaust pipe 2 connected to the outlet 34 of the exhaust purification device 3 in the third silencing chamber 47 penetrates the second partition wall 42 and is a U-shaped curved pipe in the second silencing chamber 46. The second partition 42 is again passed through the third silencer chamber 47 and the first partition wall 41, and the outlet 2 b opens to the first silencer chamber 45. Further, the tail pipe 6 is disposed through the second end portion 40 c and the second partition wall 42, and has an inlet 6 a that opens to the third silencing chamber 47.
[0050]
  The exhaust purification device 3 which is the same as the exhaust purification device 3 of the first embodiment is disposed across the first silencing chamber 45 and the third silencing chamber 47 through the first partition wall 41. Then, a holding part 32 that holds the catalyst part 30, an inlet part 33 that forms an inlet path 35 that is located upstream of the inlet end 30a of the catalyst part 30, and a downstream part of the outlet end 30b of the catalyst part 30 In the casing 31 constituted by the outlet portion 34 forming the outlet passage 36, the inlet portion 33 having the tapered tube 39 and a part of the holding portion 32 are disposed in the first silencing chamber 45 and have the tapered tube 39. The outlet part 34 and the remaining part of the holding part 32 are arranged in the third silencing chamber 47.
  Then, as shown in FIG. 30 Is the first and third silencer 45 , 47 The second exhaust pipe 2 is disposed in the first and third sound deadening chambers. 45 , 47 2nd muffler room separate from 46 A U-shaped bent tube portion is formed inside. And the exit 2b is a catalyst part. 30 1st and 3rd silencer rooms 45 , 47 Within the exit part 34 Than the entrance 33 Open on the side.
[0051]
  In the second exhaust pipe 2, the upstream end portion 20 located immediately downstream of the outlet portion 34 and disposed in the third silencing chamber 47 receives a part of the exhaust gas passing through the outlet passage 36 for the third silencing. A large number of leak holes 8 that flow out into the chamber 47 are formed with an outlet opening in the third silencing chamber 47. The upstream end portion 20 is constituted by a part of a straight pipe portion that forms a substantially constant flow path area, and on the outer periphery thereof, a sound absorbing material formed in a cylindrical shape covering the outlets of all the leak holes 8, For example, a sound absorbing member 9 made of a porous material such as glass wool is fixed and attached.
[0052]
  Further, the upstream end portion 20 is provided in the second exhaust pipe 2 within a predetermined range along the flow of exhaust gas from a position slightly downstream of the inlet end 2a connected to the tapered pipe 39. The predetermined range is appropriately set at a position close to the tapered tube 39 where the positive reflected pressure wave is generated from the viewpoint of increasing the engine output due to the leak hole 8.
[0053]
  Since the leak hole 8 is covered with the sound absorbing member 9, the diameter of each leak hole 8 is set to the leak hole of the first to third embodiments in order to secure a required outflow amount of the exhaust gas from the leak hole 8. 7, and the number of leak holes 8 is also increased as compared with the leak holes 7.
[0054]
  Next, the operation and effect of the fourth embodiment configured as described above will be described.
  The exhaust gas flowing out from the exhaust port flows into the exhaust purification device 3 through the introduction pipe and the first exhaust pipe 1, and the exhaust gas purified by the exhaust purification device 3 passes through the second exhaust pipe 2. Into the first silencing chamber 45. The exhaust gas that has been decompressed and muffled by expanding in the first muffler chamber 45 flows into the second muffler chamber 46 through the first communication passage 49, and further flows from the second muffler chamber 46 to the second communication chamber. It flows into the third silencing chamber 47 through the pipe 50. Then, the exhaust gas silenced through the first to third silencing chambers 45 to 47 is discharged from the third silencing chamber 47 through the tail pipe 6 into the outside air.
[0055]
  Further, since the exhaust purification device 3 is kept warm in the exhaust muffler 4 as in the first embodiment, it is easy to maintain the activation temperature of the catalyst, and good purification performance can be ensured. .
[0056]
  The upstream end portion 20 of the second exhaust pipe 2 is provided with a sound absorbing member 9 that covers the outlet of the leak hole 8, so that the exhaust gas immediately after flowing out from the outlet portion 34 of the exhaust purification device 3 can be obtained. In the upstream end portion 20, the portion passes through the sound absorbing member 9 from the numerous leak holes 8 and flows out into the third silencing chamber 47 in which the exhaust pulsation is minimized among the silencing chambers constituting the silencing space S. In this way, a part of the exhaust gas immediately after flowing out from the exhaust purification device 3 flows out into the third silencing chamber 47 where the exhaust pulsation is minimized, so that the pressure of the exhaust gas downstream from the catalyst unit 30 is reduced. Is significantly reduced, and a negative reflected pressure wave is generated in the leak hole, and the positive reflected pressure wave generated in the taper tube 39 is attenuated by the negative reflected pressure wave. For this reason, the same effect as the second embodiment is exhibited, and the following effect is achieved.
[0057]
  That is, the exhaust pulsation in the third silencing chamber 47 acting on the outlet of the leak hole 8 is attenuated by the sound absorbing member 9, and the exhaust gas flowing out from the leak hole 8 easily flows out into the third silencing chamber 47. The pressure of the exhaust gas downstream of 30 is effectively reduced, and the negative reflected pressure wave generated in the leak hole 8 portion effectively attenuates the positive reflected pressure wave generated in the taper tube 39. The exhaust efficiency is improved, the engine output is increased, and the decrease in the flow rate of the exhaust gas in the exhaust purification device 3 due to the positive reflected pressure wave is suppressed, so that the purification performance of the exhaust purification device 3 is improved.
[0058]
  Further, since the exhaust gas flowing out from the leak hole 8 flows into the third silencing chamber 47 after passing through the sound absorbing member 9, the exhaust sound generated by the exhaust gas is generated when the exhaust gas passes through the sound absorbing member 9. In addition, the exhaust noise is further reduced by subsequent expansion in the third silencing chamber 47, so that the exhaust noise generated by the exhaust gas flowing out from the leak hole 8 is further reduced.
[0059]
  Further, the second exhaust pipe 2 extends through the second silencing chamber 46 and the third silencing chamber 47 to the first silencing chamber 45, so that the exhaust pipe P having a long passage length is used to make the internal combustion engine. Since the exhaust inertia effect during low-speed rotation can be obtained, the required engine output can be ensured even during low-speed rotation.
[0060]
  Hereinafter, an example in which a part of the configuration of the above-described embodiment is changed will be described with respect to the changed configuration.
  In the first to third embodiments, the leak hole 7 is downstream of the outlet end 30b of the catalyst unit 30 and in the vicinity of the inlet end 39a at the downstream end portion 37b positioned upstream of the upstream side portion 39c. It may be formed. Further, the leak holes 7 do not need to be equally spaced in the circumferential direction, and may be formed at positions shifted from each other in the flow direction. Further, the number of the leak holes 7 may be plural or 1 other than 6, and the size of the leak hole 7 is set to an optimum value from the viewpoint of engine output and the exhaust purification performance, similarly to the number of the leak holes 7. Is set.
  Furthermore, the leak hole 7 may be formed in the downstream side portion 39d, although the attenuation effect of the positive reflected pressure wave is slightly reduced as compared with the first embodiment.
[0061]
  In the first to third embodiments, the leak passage is configured by a hole formed in the downstream end portion 37b of the tapered tube 39 or the main tube 37, but may be formed by a small diameter tube, thereby purifying the exhaust gas. It is possible to change the silencing chamber where the outlet of the leak passage opens without changing the silencing chamber in which the taper tube 39 of the apparatus 3 is disposed. Further, the convergent portion may be constituted by a pipe whose flow path area changes discontinuously.
[0062]
  In the first to third embodiments, a sound absorbing member similar to the sound absorbing member 9 may be attached to the outer periphery of the taper tube 39 so as to cover the leak hole 7 provided in the taper tube 39. In that case, the diameter of each leak hole 7 is made larger than that of the leak hole 7 of the first to third embodiments in order to ensure the required amount of exhaust gas flowing out, as with the leak hole 8. The number of leak holes 7 is also increased.
[0063]
  In the first to third embodiments, when the catalyst portion 30 reaches the downstream end portion 37b of the main pipe 37 and the holding portion 32 includes the downstream end portion 37b, the outlet portion 34 has the downstream end portion 37b. Only the tapered tube 39 is included without including the portion 37b. The catalyst unit 30 is composed of a carrier that supports a three-way catalyst, but may be a carrier that supports an oxidation catalyst or a reduction catalyst, and further removes harmful components in the exhaust gas to remove the exhaust gas. It may be comprised from the member which purifies.
[0064]
  The internal combustion engine may be a multi-cylinder engine, and in that case, the exhaust pipe P may be connected to the exhaust port via an exhaust manifold.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an exhaust device for an internal combustion engine according to a first embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of an essential part of an exhaust device for an internal combustion engine according to a second embodiment of the present invention.
FIG. 3 is a longitudinal sectional view of an essential part of an exhaust device for an internal combustion engine according to a third embodiment of the present invention.
FIG. 4 is a longitudinal sectional view of an exhaust device for an internal combustion engine according to a fourth embodiment of the present invention.
5 is a cross-sectional view taken along line VV in FIG.
[Explanation of symbols]
  DESCRIPTION OF SYMBOLS 1 ... 1st exhaust pipe, 2 ... 2nd exhaust pipe, 3 ... Exhaust purification device, 4 ... Exhaust muffler, 6 ... Tail pipe, 7, 8 ... Leak hole, 9 ... Sound absorption member, 20 ... Upstream end side part, 30 ... catalyst part, 31 ... casing, 32 ... holding part, 33 ... inlet part, 34 ... outlet part, 35 ... inlet path, 36 ... exit path, 37 ... main pipe, 38,39 ... tapered pipe, 39c ... upstream side part, 40 ... outer wall, 41, 42, 43 ... partition wall, 44 ... discharge pipe, 45-48 ... muffler chamber, 49, 50 ... communication pipe, E ... exhaust device, S ... muffler space, P ... exhaust pipe.

Claims (1)

  1. An exhaust muffler, an exhaust port provided between an exhaust port of an internal combustion engine and a silencer space of the exhaust muffler, and an exhaust purification device provided in the middle of the exhaust pipe, wherein the exhaust pipe includes the exhaust muffler An upstream exhaust pipe and a downstream exhaust pipe respectively disposed upstream and downstream of the purification device, and the exhaust purification device forms an inlet passage through which the purification element and the exhaust gas flow into the purification element And an exhaust device for an internal combustion engine having an outlet portion that forms an outlet passage through which the exhaust gas after purification flows out of the purification element,
    The silencing space is composed of a plurality of silencing chambers partitioned by a partition wall,
    The purification element is disposed in the muffler chamber;
    The downstream exhaust pipe extends through the partition wall after forming a U-shaped bent pipe portion extending in the silencer chamber different from the silencer chamber in which the purification element is disposed through the partition wall. And extends in the muffler chamber in which the purification element is disposed,
    The outlet of the downstream side exhaust pipe is opened closer to the inlet portion than the outlet portion in the muffler chamber where the purification element is disposed,
    The outlet portion has a convergent portion whose flow path area decreases toward the downstream of the exhaust gas,
    An exhaust system for an internal combustion engine, wherein one or a plurality of leak passages for allowing a part of exhaust gas to flow out are provided in an upstream end side portion of the outlet portion or the downstream exhaust pipe.
JP2002314553A 2002-10-29 2002-10-29 Exhaust device for internal combustion engine Expired - Fee Related JP4024127B2 (en)

Priority Applications (1)

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JP2002314553A JP4024127B2 (en) 2002-10-29 2002-10-29 Exhaust device for internal combustion engine
ITTO20030835 ITTO20030835A1 (en) 2002-10-29 2003-10-23 An exhaust device for an internal combustion engine.
CNB2003101043294A CN1294345C (en) 2002-10-29 2003-10-24 Exhauster of I.C. engine

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CN1499051A (en) 2004-05-26

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