EP3064722A1 - Exhaust device for engine - Google Patents
Exhaust device for engine Download PDFInfo
- Publication number
- EP3064722A1 EP3064722A1 EP16150653.0A EP16150653A EP3064722A1 EP 3064722 A1 EP3064722 A1 EP 3064722A1 EP 16150653 A EP16150653 A EP 16150653A EP 3064722 A1 EP3064722 A1 EP 3064722A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- expansion chamber
- oxygen sensor
- exhaust
- silencer
- exhaust pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 131
- 239000001301 oxygen Substances 0.000 claims abstract description 131
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 131
- 230000003584 silencer Effects 0.000 claims abstract description 72
- 239000007789 gas Substances 0.000 claims abstract description 67
- 239000012530 fluid Substances 0.000 claims abstract description 46
- 239000003054 catalyst Substances 0.000 claims abstract description 42
- 238000011144 upstream manufacturing Methods 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 238000007599 discharging Methods 0.000 claims description 4
- 239000012080 ambient air Substances 0.000 description 8
- 230000006866 deterioration Effects 0.000 description 6
- 230000005494 condensation Effects 0.000 description 5
- 238000009833 condensation Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000002411 adverse Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000003570 air Substances 0.000 description 2
- 230000000994 depressogenic effect Effects 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
- F01N1/089—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using two or more expansion chambers in series
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2490/00—Structure, disposition or shape of gas-chambers
- F01N2490/02—Two or more expansion chambers in series connected by means of tubes
- F01N2490/04—Two or more expansion chambers in series connected by means of tubes the gases flowing longitudinally from inlet to outlet only in one direction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
- F01N2590/04—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for motorcycles
Definitions
- the present invention relates to an exhaust device for an engine which is provided with an oxygen sensor.
- an exhaust device (6) for an engine (the number in parentheses denotes a reference character as used in WO 2005/075805 , and the same holds true for other numbers below) includes an exhaust pipe (7) extending from the exhaust port of an engine and a silencer (8) connected to the downstream end (7a) of the exhaust pipe (7), the downstream end (7a) extending into the silencer (8).
- a three-way catalyst (10) is disposed in the exhaust pipe (7), and an O 2 sensor (14) (hereinafter referred to as "oxygen sensor (14)") is disposed in the silencer (8) downstream of the three-way catalyst (10).
- the oxygen sensor (14) is disposed in a first expansion chamber (8a) of the silencer (8) in facing relation to the outlet of the exhaust pipe (7).
- a secondary air inlet pipe (12) is connected to the exhaust pipe (7) upstream of the three-way catalyst (10).
- the oxygen sensor (14) being disposed in facing relation to the outlet of the exhaust pipe (7), when the temperature of an exhaust gas that remains in the silencer (8) drops, the amount of water deposited on the oxygen sensor (14) may possibly increase due to condensation. If the amount of water deposited on the oxygen sensor (14) increases, then the oxygen sensor (14) can deteriorate, which leads to a durability problem.
- the exhaust gas that has been mixed with secondary air, burned, and treated by the three-way catalyst (10) is not sufficiently stirred in the exhaust pipe (7), so that data from the oxygen sensor (14) may only relate to local conditions.
- the known exhaust device is not ideal with regard to the accuracy with which the service life of the catalyst can be ascertained.
- an exhaust device for an engine which is provided with an oxygen sensor whose durability is increased, and which is capable of detecting an oxygen component while an exhaust gas is being sufficiently stirred, so that the detected data relates to the exhaust gas as a whole and not merely local conditions.
- an exhaust device for an engine including an exhaust pipe for guiding exhaust gas from an engine and a silencer connected to a downstream side of the exhaust pipe, for reducing exhaust sounds and discharging the exhaust gas out of the exhaust device
- the exhaust pipe includes a catalyst for purifying the exhaust gas
- the silencer includes an expansion chamber in which the exhaust gas expands, the exhaust pipe extends into the expansion chamber
- the expansion chamber includes a first expansion chamber and a second expansion chamber downstream of the first expansion chamber, the first expansion chamber and the second expansion chamber are connected to each other by a first fluid communication pipe
- the exhaust device includes an oxygen sensor for detecting an oxygen component in the exhaust gas
- the oxygen sensor is disposed downstream of the catalyst in facing relation to an opening of the first fluid communication pipe
- the oxygen sensor is disposed outwardly of a downstream edge of the exhaust pipe when the exhaust pipe is viewed along a longitudinal axis thereof.
- the exhaust pipe extends into the first expansion chamber of the silencer in which the exhaust gas expands.
- the exhaust gas discharged from the exhaust pipe expands in the first expansion chamber, passes from the first expansion chamber through the first fluid communication pipe, and then expands in the second expansion chamber.
- the exhaust gas stirred in the first expansion chamber is brought into contact with the oxygen sensor that is disposed in facing relation to the opening of the first fluid communication pipe that interconnects the first expansion chamber and the second expansion chamber.
- the oxygen sensor Since the oxygen sensor is disposed outwardly of the extension of the downstream edge of the exhaust pipe, the exhaust gas that has been sufficiently stirred and uniformized in the first expansion chamber is brought into contact with the oxygen sensor. Therefore, the exhaust gas that has been uniformized is brought into contact with the oxygen sensor. As a result, the oxygen sensor can detect the exhaust gas that has been sufficiently stirred, and the service life of the catalyst can be ascertained accurately.
- the oxygen sensor is disposed outwardly of the downstream edge of the exhaust pipe.
- the exhaust gas discharged from the exhaust pipe and having its temperature increased is less likely to be brought into direct contact with the oxygen sensor. Therefore, when the temperature of the silencer drops, water produced by thermal condensation is less liable to be deposited on the oxygen sensor. As a result, deterioration of the oxygen sensor is reduced, and durability of the oxygen sensor can be increased.
- the oxygen sensor is disposed upwardly of the downstream edge of the exhaust pipe.
- the silencer has a recess defined in an upper surface thereof, and the oxygen sensor is disposed in the recess.
- the vehicle With the oxygen sensor disposed in the recess, components that are disposed above the silencer can be lowered. As a result, the vehicle may have its centre of gravity lowered.
- the oxygen sensor is provided in the first expansion chamber which is upstream of the first fluid communication pipe.
- the state of the catalyst can be ascertained more accurately.
- the expansion chamber included in the silencer further includes a third expansion chamber disposed downstream of the second expansion chamber, and the third expansion chamber has a drain hole for draining water.
- the silencer includes the first expansion chamber that is provided with the oxygen sensor, the second expansion chamber, and the third expansion chamber, and the drain hole is provided in the third expansion chamber.
- a motorcycle 10 has a vehicle body frame 11, a front wheel steering assembly 13 steerably mounted at the front of the vehicle body frame 11, a rear suspension assembly 14 swingably mounted on the vehicle body frame 11, an engine 17 suspended from the vehicle body frame 11 between a front wheel 15 and a rear wheel 16, a fuel tank 18 placed on the vehicle body frame 11 upwardly of the engine 17, and a seat 19, for the rider to sit thereon, mounted on the vehicle body frame 11 behind the fuel tank 18.
- the front wheel steering assembly 13 has the front wheel 15, a front fork 20 supporting the front wheel 15 thereon, and a steering handle 21 mounted on the front fork 20.
- the rear suspension assembly 14 has a swing arm 23 swingably extending rearwardly from a pivot member 22 and the rear wheel 16 rotatably mounted on a rear end portion of the swing arm 23.
- the engine 17 that is suspended from the vehicle body frame 11 includes a crankcase 25, a cylinder block 26 extending obliquely forwardly and upwardly from the crankcase 25, and a cylinder head 27 mounted on the cylinder block 26.
- the engine 17 is an in-line four-cylinder engine.
- An intake device 28 is connected to a rear surface 27b of the cylinder head 27, and an exhaust device 29 is connected to a front surface 27a of the cylinder head 27.
- the exhaust device 29 of the engine 17 includes an exhaust pipe 31 extending from the front surface 27a of the cylinder head 27, for guiding exhaust gas from the engine 17, and a silencer 32 connected to a downstream side of the exhaust pipe 31, for reducing exhaust sounds and discharging the exhaust gas out of the exhaust device 29.
- the exhaust device 29 has lateral and lower sides covered with an under cover 33 below the engine 17.
- the exhaust device 29 has as its main components a first upstream exhaust pipe 41, a second upstream exhaust pipe 42, a third upstream exhaust pipe 43, and a fourth upstream exhaust pipe 44 which are each connected to the exhaust ports of the engine, an exhaust manifold 45 connected to the downstream ends of the first upstream exhaust pipe 41, the second upstream exhaust pipe 42, the third upstream exhaust pipe 43, and the fourth upstream exhaust pipe 44, and the silencer 32, which is of a substantially rectangular shape, connected to the rear end of the exhaust manifold 45.
- Flanges 46, 47, 48, and 49 for respectively fixing the first upstream exhaust pipe 41, the second upstream exhaust pipe 42, the third upstream exhaust pipe 43, and the fourth upstream exhaust pipe 44 to the engine 17 are mounted to the upstream ends of the first upstream exhaust pipe 41, the second upstream exhaust pipe 42, the third upstream exhaust pipe 43, and the fourth upstream exhaust pipe 44.
- Two silencer stays 51 for supporting the silencer 32 on the vehicle body frame are mounted on an upper surface 32a of the silencer 32.
- a manifold collar 52 is interposed between the first upstream exhaust pipe 41, the second upstream exhaust pipe 42, the third upstream exhaust pipe 43, and the fourth upstream exhaust pipe 44, and the exhaust manifold 45, and joins them together.
- the exhaust manifold 45 includes two halves 45A and 45B held in abutment against each other.
- An upstream oxygen sensor 53 for detecting an oxygen component in the exhaust gas is mounted on the exhaust manifold 45 at a position near its rear end.
- the silencer 32 includes a lower half 32A and an upper half 32B covering the lower half 32A from above.
- the upper half 32B has a recess 55 defined in an upper surface thereof.
- a downstream oxygen sensor 54 (hereinafter also referred to as “oxygen sensor 54") for detecting an oxygen component in the exhaust gas is mounted in the recess 55.
- the internal structure, etc. of the silencer 32 will be described below.
- the silencer 32 houses therein a first separator 57 extending transversely therein and a second separator 58 extending transversely therein behind the first separator 57.
- the first separator 57 and the second separator 58 define three expansion chambers in the silencer 32 wherein the exhaust gas expands.
- the silencer 32 has a front wall 32aa, on which is mounted a front catalyst holder 67 that supports the front end of the catalyst 50.
- a rear catalyst holder 65 that supports the rear end of the catalyst 50 is mounted on the first separator 57.
- the front catalyst holder 67 and the rear catalyst holder 65 support the catalyst 50.
- a cap 66 which is of a substantially frustoconical shape as viewed in side elevation and which is formed from a perforated plate for diffusing and discharging the exhaust gas purified by the catalyst 50, is mounted on the downstream end of the catalyst 50.
- the upstream oxygen sensor 53 (see FIG. 3 ) is positioned upstream of the catalyst 50, whereas the downstream oxygen sensor 54 is positioned downstream of the catalyst 50.
- the three expansion chambers 60 include a first expansion chamber 61, a second expansion chamber 62 disposed downstream of the first expansion chamber 61, and a third expansion chamber 63 disposed downstream of the second expansion chamber 62. These expansion chambers are arranged successively in the order from the third expansion chamber 63 to the first expansion chamber 61 to the second expansion chamber 62 in the longitudinal direction of the silencer 32, from front to back.
- the third expansion chamber 63 and the first expansion chamber 61 are separated from one another by the first separator 57, and the first expansion chamber 61 and the second expansion chamber 62 are separated from one another by the second separator 58.
- the first expansion chamber 61 and the second expansion chamber 62 are connected to each other by a first fluid communication pipe 71 that is supported by the second separator 58.
- the second expansion chamber 62 and the third expansion chamber 63 are connected to each other by a second fluid communication pipe 72 that is supported by the first separator 57 and the second separator 58.
- the third expansion chamber 63 is vented to the outside by a third fluid communication pipe 73 that is supported by the first separator 57 and the second separator 58 and a tail pipe 74 that extends from the downstream end of the third fluid communication pipe 73 and that is supported by the second separator 58 and the upper half 32B of the silencer 32.
- the exhaust gas that has passed through the downstream end of the catalyst 50 passes through the cap 66, expands in the first expansion chamber 61, passes through the first fluid communication pipe 71 that is disposed in the first expansion chamber 61, and reaches the second expansion chamber 62.
- the exhaust gas then expands in the second expansion chamber 62, passes through the second fluid communication pipe 72, and reaches the third expansion chamber 63.
- the exhaust gas then expands in the third expansion chamber 63, passes through the third fluid communication pipe 73, then passes through the tail pipe 74 that is connected to the rear end of the third fluid communication pipe 73 and is discharged out of the silencer 32.
- the second separator 58 that separates the first expansion chamber 61 and the second expansion chamber 62 is disposed in the silencer 32.
- the second separator 58 has a support hole 76 defined in an upper portion thereof, and the first fluid communication pipe 71 is disposed in the support hole 76 such that the axis of the first fluid communication pipe 71 extends generally horizontally.
- the first fluid communication pipe 71 has an upstream end with a lip 77 that flares radially outwardly for guiding the exhaust gas stirred in the first expansion chamber 61 smoothly into the first fluid communication pipe 71.
- the recess 55 which is downwardly depressed is defined in the upper surface 32a of the silencer 32 at a position corresponding to the first expansion chamber 61.
- the oxygen sensor 54 is disposed in the recess 55.
- a boss 82 having an internally threaded surface 78 with which the oxygen sensor 54 is held in threaded engagement is welded in the recess 55. Since the oxygen sensor 54 is mounted on the silencer 32 by the boss 82, the strength with which the oxygen sensor 54 is supported is ensured.
- the oxygen sensor 54 has on its lower end an element 83 serving as an oxygen detector which is disposed at such a height that the element 83 faces an inside-diameter region 71 u (opening 71 k) of the first fluid communication pipe 71.
- the oxygen sensor 54 for detecting an oxygen component in the exhaust gas is disposed downstream of the catalyst 50 and faces the opening 71 k of the first fluid communication pipe 71.
- the oxygen sensor 54 is provided in the first expansion chamber 61 that is positioned upstream of the first fluid communication pipe 71.
- the oxygen sensor 54 is disposed outwardly of a downstream edge 31 b of the exhaust pipe 31 when the exhaust pipe 31 is viewed along the longitudinal axis thereof.
- the oxygen sensor 54 is disposed upwardly of the downstream edge 31 b of the exhaust pipe 31.
- the first separator 57 has a first drain hole 86 defined in the lower end thereof for draining water
- the second separator 58 has a second drain hole 87 defined in the lower end thereof for draining water
- the third expansion chamber 63 has a drain hole 88 for draining water.
- the silencer 32 includes a bottom 32s having a slanted portion 89 which is slanted rearwardly and upwardly such that the height of the first drain hole 86 is greater than the height of the drain hole 88 and the height of the second drain hole 87 is greater than the height of the first drain hole 86.
- the water that has flowed from the second expansion chamber 62 into the first expansion chamber 61 and water condensed in the first expansion chamber 61 flow downwardly along the slanted portion 89 through the first drain hole 86 into the third expansion chamber 63.
- the water that has flowed from the first expansion chamber 61 into the third expansion chamber 63 along the slanted portion 89 and water condensed in the third expansion chamber 63 is discharged out of the silencer 32 through the drain hole 88.
- the water that is collected on the bottom 32s of the silencer 32 can easily be drained out of the silencer 32 by the acceleration of the vehicle when it starts to move as well as the slanted portion 89 that is slanted rearwardly.
- the exhaust pipe 31 includes the front catalyst holder 67 and the catalyst 50, and extends into the first expansion chamber 61 of the silencer 32 in which the exhaust gas expands.
- the exhaust gas discharged from the exhaust pipe 31 expands in the first expansion chamber 61, passes from the first expansion chamber 61 through the first fluid communication pipe 71, and then expands in the second expansion chamber 62. At this time, the exhaust gas stirred in the first expansion chamber 61 is brought into contact with the oxygen sensor 54 that is disposed in facing relation to the opening 71 k of the first fluid communication pipe 71.
- the oxygen sensor 54 Since the oxygen sensor 54 is disposed outwardly of the extension of the downstream edge 31 b (see FIG. 7 ) of the exhaust pipe 31, the exhaust gas that has passed through the cap 66 and has been stirred in the first expansion chamber 61 is brought into contact with the oxygen sensor 54. Therefore, as the exhaust gas that is brought into contact with the oxygen sensor 54 has been sufficiently stirred and uniformized, it is possible to ascertain the state of the catalyst 50 more accurately.
- the service life of the catalyst 50 can be determined to a nicety.
- the oxygen sensor 54 is disposed outwardly of the downstream edge 31 b of the exhaust pipe 31 when the exhaust pipe 31 is viewed along a longitudinal axis 31X thereof.
- exhaust gas discharged from the exhaust pipe 31 and having its temperature increased is less likely to be brought into direct contact with the oxygen sensor 54. Therefore, when the temperature of the silencer 32 drops, water produced by thermal condensation is less liable to be deposited on the oxygen sensor 54. As a result, deterioration of the oxygen sensor 54 is reduced, and durability of the oxygen sensor 54 is increased.
- the oxygen sensor 54 is disposed upwardly of the downstream edge 31 b of the exhaust pipe 31.
- water contained in a gas in the exhaust pipe 31 may condense in the exhaust pipe 31.
- the condensed water is directed downwardly. Since the oxygen sensor 54 is disposed upwardly of the downstream edge 31 b of the exhaust pipe 31, it is less likely that the condensed water will be deposited directly on the oxygen sensor 54. As a consequence, the oxygen sensor 54 has its service life increased.
- the oxygen sensor 54 is disposed in the recess 55 defined in the upper surface 32a of the silencer 32. With the oxygen sensor 54 disposed in the recess 55, components that are disposed above the silencer 32 can be lowered. As a result, the vehicle may have its centre of gravity lowered.
- the oxygen sensor 54 is provided in the first expansion chamber 61 that is positioned upstream of the first fluid communication pipe 71. As the first expansion chamber 61 is farther from an outlet 32d (see FIG. 5 ) of the silencer 32 than the second expansion chamber 62, even if ambient air flows back into the silencer 32, any adverse effect that the ambient air has on data detected by the oxygen sensor 54 can be reduced. Therefore, the state of the catalyst 50 (see FIG. 5 ) can be ascertained more accurately.
- the silencer 32 has the third expansion chamber 63 that is separate from the first expansion chamber 61 that is provided with the oxygen sensor 54, and the drain hole 88 is provided in the third expansion chamber 63.
- the temperature of the silencer 32 drops, water condensed in the first expansion chamber 61 flows out through the drain hole 88 in the third expansion chamber 63.
- deterioration of the oxygen sensor 54 is reduced.
- the service life of the oxygen sensor 54 can be extended.
- the second separator 58 that separates the first expansion chamber 61 and the second expansion chamber 62 is disposed in the silencer 32, and has the support hole 76 defined in the upper portion thereof.
- the first fluid communication pipe 71 is disposed in the support hole 76 such that the axis of the first fluid communication pipe 71 extends generally horizontally.
- the modification differs from the first embodiment in that the downwardly depressed recess 55 is defined in the upper surface 32a of the silencer 32 at a position corresponding to the second expansion chamber 62, and the oxygen sensor 54 is disposed in the recess 55.
- the oxygen sensor 54 is disposed downstream of the first fluid communication pipe 71 through which the exhaust gas flows.
- Other details of the modification are not different from those of the first embodiment, and will not be described in detail below.
- the exhaust gas discharged from the exhaust pipe 31 expands in the first expansion chamber 61, passes from the first expansion chamber 61 through the first fluid communication pipe 71, and is then expanded in the second expansion chamber 62.
- the exhaust gas stirred in the first expansion chamber 61 is brought into contact with the oxygen sensor 54 that is disposed in facing relation to the opening 71k of the first fluid communication pipe 71. Since the oxygen sensor 54 is disposed outwardly of the extension of the downstream edge 31 b (see FIG. 7 ) of the exhaust pipe 31, the exhaust gas that is brought into contact with the oxygen sensor 54 has been sufficiently stirred and uniformized in the first expansion chamber 61. Therefore, as the exhaust gas that has been sufficiently stirred and uniformized is brought into contact with the oxygen sensor 54, it is possible to ascertain the state of the catalyst 50 (see FIG. 5 ) more accurately.
- the oxygen sensor 54 Since the oxygen sensor 54 is disposed outwardly of the extension of the downstream edge 31 b of the exhaust pipe 31, the exhaust gas that has been sufficiently stirred and uniformized in the first expansion chamber 61 is brought into contact with the oxygen sensor 54. Therefore, as the exhaust gas that has been sufficiently stirred and uniformized is brought into contact with the oxygen sensor 54, the service life of the catalyst 50 can be determined to a nicety.
- the oxygen sensor 54 is disposed outwardly of the downstream edge 31 b of the exhaust pipe 31 when the exhaust pipe 31 is viewed along the longitudinal axis 31X (see FIG. 7 ) thereof.
- the exhaust gas discharged from the exhaust pipe 31 and having its temperature increased is less likely to be brought into direct contact with the oxygen sensor 54. Therefore, when the temperature of the silencer 32 drops, water produced by thermal condensation is less liable to be deposited on the oxygen sensor 54. As a result, deterioration of the oxygen sensor 54 can be reduced, and durability of the oxygen sensor 54 can be increased.
- the oxygen sensor 54 is provided in the second expansion chamber 62 that is positioned downstream of the first fluid communication pipe 71.
- the second expansion chamber 62 is farther from the outlet 32d (see FIG. 5 ) of the silencer 32 than the third expansion chamber 63 (see FIG. 5 ) along the length of the exhaust route starting from the outlet 32d of the silencer 32, even if ambient air flows back into the silencer 32 due to a turbulent flow of the exhaust gas, any adverse effect that the ambient air has on data detected by the oxygen sensor 54 is reduced. Therefore, the state of the catalyst 50 (see FIG. 5 ) can be ascertained more accurately.
- Other operational details are the same as those of the first embodiment and will not be described below.
- an exhaust device 29 includes an exhaust pipe 31 and a silencer 32 connected to the downstream side of the exhaust pipe 31.
- the exhaust pipe 31 includes a catalyst 50 for purifying an exhaust gas.
- the silencer 32 has an increasing-diameter portion 91, an outer tube 92 connected to the rear end of the increasing-diameter portion 91 and extending rearwardly, an inner tube 93 disposed coaxially within the outer tube 92, an inner lid 94 closing off the rear end of the inner tube 93, and an outer lid 95 fitted in the outer tube 92 from behind the outer side of the inner lid 94.
- the inner tube 93 has a first separator 57, a second separator 58, and a third separator 59 housed therein.
- the first separator 57, the second separator 58, and the third separator 59 extend perpendicularly to the longitudinal axis of the inner tube 93 at spaced intervals, and divide an expansion chamber 60 defined in the silencer 32, wherein the exhaust gas expands, into compartments.
- the first separator 57, the second separator 58, and the third separator 59 extend generally perpendicularly to the longitudinal axis of the silencer 32.
- the expansion chamber 60 is divided into four expansion chambers by the first separator 57, the second separator 58, and the third separator 59.
- the expansion chamber 60 includes a first expansion chamber 61, a second expansion chamber 62 disposed downstream of the first expansion chamber 61, a third expansion chamber 63 disposed downstream of the second expansion chamber 62, and a fourth expansion chamber 64 disposed downstream of the third expansion chamber 63.
- the first expansion chamber 61, the fourth expansion chamber 64, the third expansion chamber 63, and the second expansion chamber 62 are arranged longitudinally successively in that order in the silencer 32 from front to back.
- the first expansion chamber 61 and the second expansion chamber 62 are held in fluid communication with each other by a first fluid communication pipe 71 extending through the first separator 57, the second separator 58, and the third separator 59 and supported by the first separator 57, the second separator 58, and the third separator 59.
- the second expansion chamber 62 and the third expansion chamber 63 are held in fluid communication with each other by a second fluid communication pipe 72 extending through the third separator 59 and supported by the third separator 59.
- the third expansion chamber 63 and the fourth expansion chamber 64 are held in fluid communication with each other by a third fluid communication pipe 73 extending through the second separator 58 and supported by the second separator 58.
- the fourth expansion chamber 64 is vented to the outside by two fourth fluid communication pipes 97A and 97B extending through the second and third separators 58 and 59 and supported by the second and third separators 58 and 59.
- a perforated plate 98 is located between the first separator 57 and the increasing-diameter portion 91.
- the exhaust gas that has passed through the downstream end of the catalyst 50 expands in the first expansion chamber 61 wherein the perforated plate 98 is located, passes through the first fluid communication pipe 71 provided in the first expansion chamber 61, and reaches the second expansion chamber 62.
- the exhaust gas expands in the second expansion chamber 62, and the exhaust gas that has expanded in the second expansion chamber 62 passes through the second fluid communication pipe 72, and reaches the third expansion chamber 63.
- the exhaust gas expands in the third expansion chamber 63, and thereafter passes through the third fluid communication pipe 73, then passes through the two fourth fluid communication pipes 97A and 97B that are connected to the rear end of the third fluid communication pipe 73, and is discharged out of the silencer 32.
- An oxygen sensor 54 for detecting an oxygen component in the exhaust gas is mounted on the increasing-diameter portion 91 of the silencer 32 downstream of the catalyst 50.
- the oxygen sensor 54 is disposed outwardly of the downstream edge 31b of the exhaust pipe 31 when the exhaust pipe 31 is viewed along the longitudinal axis thereof.
- the oxygen sensor 54 is provided in the first expansion chamber 61 and disposed upwardly of the downstream edge 31 b of the exhaust pipe 31.
- a boss 82 having an internally threaded surface 78 with which the oxygen sensor 54 is held in threaded engagement is welded to a portion of the increasing-diameter portion 91 which corresponds to the first expansion chamber 61. Since the oxygen sensor 54 is mounted on the silencer 32 by the boss 82, the strength with which the oxygen sensor 54 is supported can be ensured.
- the oxygen sensor 54 has on its lower end an element 83 serving as an oxygen detector. The element 83 is disposed outwardly of the downstream edge 31 b (see FIG. 10 ) of the exhaust pipe 31.
- the exhaust pipe 31 extends into the first expansion chamber 61 of the silencer 32 in which the exhaust gas expands.
- the exhaust gas discharged from the exhaust pipe 31 expands in the first expansion chamber 61.
- the exhaust gas that has been stirred in the first expansion chamber 61 is brought into contact with the oxygen sensor 54 that is disposed outwardly of the downstream edge 31 b of the exhaust pipe 31 when the exhaust pipe 31 is viewed along the longitudinal axis 31X thereof.
- the oxygen sensor 54 Since the oxygen sensor 54 is disposed outwardly of the extension of the downstream edge 31 b of the exhaust pipe 31, exhaust gas that has been sufficiently stirred and uniformized in the first expansion chamber 61 is brought into contact with the oxygen sensor 54. Therefore, as the exhaust gas that has been sufficiently stirred and uniformized is brought into contact with the oxygen sensor 54, it is possible to ascertain the state of the catalyst 50 more accurately.
- the oxygen sensor 54 is disposed outwardly of the downstream edge 31 b of the exhaust pipe 31 when the exhaust pipe 31 is viewed along the longitudinal axis thereof.
- the exhaust gas discharged from the exhaust pipe 31 and having its temperature increased is thus less likely to be brought into direct contact with the oxygen sensor 54. Therefore, when the temperature of the silencer 32 drops, water produced by thermal condensation is less liable to be deposited on the oxygen sensor 54. As a result, deterioration of the oxygen sensor 54 can be reduced, and durability of the oxygen sensor 54 can be increased.
- the oxygen sensor 54 is disposed upwardly of the downstream edge 31 b of the exhaust pipe 31.
- water contained in a gas in the exhaust pipe 31 may condense in the exhaust pipe 31.
- the condensed water is directed downwardly. Since the oxygen sensor 54 is disposed upwardly of the downstream edge 31 b of the exhaust pipe 31, the condensed water is less likely to be deposited directly on the oxygen sensor 54. As a consequence, the oxygen sensor 54 can have its service life increased.
- the oxygen sensor 54 is provided in the first expansion chamber 61. As the first expansion chamber 61 is farther from the outlet 32d of the silencer 32 than the second expansion chamber 62, even if ambient air flows back into the silencer 32 due to a turbulent flow of the exhaust gas, any adverse effect that the ambient air has on data detected by the oxygen sensor 54 can be reduced. Therefore, the state of the catalyst 50 can be ascertained more accurately.
- the structure of the exhaust device has been described above.
- the exhaust device that has been described is a left one of a pair of left and right exhaust devices.
- the right exhaust device has a structure which is bilaterally symmetric with respect to the lateral centreline of the vehicle across the transverse directions thereof, and operates in the same manner and offers the same advantages as the left exhaust device Therefore, the right exhaust device will not be described herein.
- the present invention has been described as applied to a motorcycle. However, the present invention is also applicable to a three-wheeled vehicle and may also be applied to vehicles in general.
- the present invention is preferably applicable to a motorcycle wherein an exhaust device for an engine is provided with an oxygen sensor.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Silencers (AREA)
Abstract
Description
- The present invention relates to an exhaust device for an engine which is provided with an oxygen sensor.
- There is known an exhaust device for an engine which is provided with an oxygen sensor for detecting an oxygen component in an exhaust gas (see, for example,
WO 2005/075805 (FIG. 2 )) - As shown in
FIG. 2 ofWO 2005/075805 , an exhaust device (6) for an engine (the number in parentheses denotes a reference character as used inWO 2005/075805 , and the same holds true for other numbers below) includes an exhaust pipe (7) extending from the exhaust port of an engine and a silencer (8) connected to the downstream end (7a) of the exhaust pipe (7), the downstream end (7a) extending into the silencer (8). A three-way catalyst (10) is disposed in the exhaust pipe (7), and an O2 sensor (14) (hereinafter referred to as "oxygen sensor (14)") is disposed in the silencer (8) downstream of the three-way catalyst (10). The oxygen sensor (14) is disposed in a first expansion chamber (8a) of the silencer (8) in facing relation to the outlet of the exhaust pipe (7). A secondary air inlet pipe (12) is connected to the exhaust pipe (7) upstream of the three-way catalyst (10). - According to the technology of
WO 2005/075805 , with the oxygen sensor (14) being disposed in facing relation to the outlet of the exhaust pipe (7), when the temperature of an exhaust gas that remains in the silencer (8) drops, the amount of water deposited on the oxygen sensor (14) may possibly increase due to condensation. If the amount of water deposited on the oxygen sensor (14) increases, then the oxygen sensor (14) can deteriorate, which leads to a durability problem. - Further, the exhaust gas that has been mixed with secondary air, burned, and treated by the three-way catalyst (10) is not sufficiently stirred in the exhaust pipe (7), so that data from the oxygen sensor (14) may only relate to local conditions. As a result, the known exhaust device is not ideal with regard to the accuracy with which the service life of the catalyst can be ascertained.
- Accordingly, there is a desire for an exhaust device for an engine which is provided with an oxygen sensor whose durability is increased, and which is capable of detecting an oxygen component while an exhaust gas is being sufficiently stirred, so that the detected data relates to the exhaust gas as a whole and not merely local conditions.
- It is an object of at least the preferred embodiments of the present invention to provide an exhaust device for an engine which is capable of increasing the durability of an oxygen sensor and increasing the accuracy with which the oxygen sensor detects oxygen.
- According to a first aspect of the invention, there is provided an exhaust device for an engine, including an exhaust pipe for guiding exhaust gas from an engine and a silencer connected to a downstream side of the exhaust pipe, for reducing exhaust sounds and discharging the exhaust gas out of the exhaust device, wherein the exhaust pipe includes a catalyst for purifying the exhaust gas, the silencer includes an expansion chamber in which the exhaust gas expands, the exhaust pipe extends into the expansion chamber, the expansion chamber includes a first expansion chamber and a second expansion chamber downstream of the first expansion chamber, the first expansion chamber and the second expansion chamber are connected to each other by a first fluid communication pipe, the exhaust device includes an oxygen sensor for detecting an oxygen component in the exhaust gas, the oxygen sensor is disposed downstream of the catalyst in facing relation to an opening of the first fluid communication pipe, and the oxygen sensor is disposed outwardly of a downstream edge of the exhaust pipe when the exhaust pipe is viewed along a longitudinal axis thereof.
- With this arrangement, the exhaust pipe extends into the first expansion chamber of the silencer in which the exhaust gas expands. The exhaust gas discharged from the exhaust pipe expands in the first expansion chamber, passes from the first expansion chamber through the first fluid communication pipe, and then expands in the second expansion chamber. At this time, the exhaust gas stirred in the first expansion chamber is brought into contact with the oxygen sensor that is disposed in facing relation to the opening of the first fluid communication pipe that interconnects the first expansion chamber and the second expansion chamber.
- Since the oxygen sensor is disposed outwardly of the extension of the downstream edge of the exhaust pipe, the exhaust gas that has been sufficiently stirred and uniformized in the first expansion chamber is brought into contact with the oxygen sensor. Therefore, the exhaust gas that has been uniformized is brought into contact with the oxygen sensor. As a result, the oxygen sensor can detect the exhaust gas that has been sufficiently stirred, and the service life of the catalyst can be ascertained accurately.
- The oxygen sensor is disposed outwardly of the downstream edge of the exhaust pipe. The exhaust gas discharged from the exhaust pipe and having its temperature increased is less likely to be brought into direct contact with the oxygen sensor. Therefore, when the temperature of the silencer drops, water produced by thermal condensation is less liable to be deposited on the oxygen sensor. As a result, deterioration of the oxygen sensor is reduced, and durability of the oxygen sensor can be increased.
- Preferably, the oxygen sensor is disposed upwardly of the downstream edge of the exhaust pipe.
- When the engine is shut down and the temperature in the exhaust pipe drops, water contained in a gas in the exhaust pipe may condense in the exhaust pipe. The condensed water is directed downwardly. Since the oxygen sensor is disposed upwardly of the downstream edge of the exhaust pipe, it is less likely that the condensed water will be deposited directly on the oxygen sensor. As a consequence, the oxygen sensor has its service life increased.
- Preferably, the silencer has a recess defined in an upper surface thereof, and the oxygen sensor is disposed in the recess.
- With the oxygen sensor disposed in the recess, components that are disposed above the silencer can be lowered. As a result, the vehicle may have its centre of gravity lowered.
- Preferably, the oxygen sensor is provided in the first expansion chamber which is upstream of the first fluid communication pipe.
- As the first expansion chamber is farther from the outlet of the silencer than the second expansion chamber, even if ambient air flows back into the silencer, the adverse effect that the ambient air can have on data detected by the oxygen sensor is reduced. Therefore, the state of the catalyst can be ascertained more accurately.
- Preferably, the expansion chamber included in the silencer further includes a third expansion chamber disposed downstream of the second expansion chamber, and the third expansion chamber has a drain hole for draining water.
- With this arrangement, the silencer includes the first expansion chamber that is provided with the oxygen sensor, the second expansion chamber, and the third expansion chamber, and the drain hole is provided in the third expansion chamber. When the temperature of the silencer drops, water condensed in the first expansion chamber flows out through the drain hole in the third expansion chamber. As water is less likely to remain in the first expansion chamber, deterioration of the oxygen sensor can be reduced. As a result, the service life of the oxygen sensor can be extended.
- Preferred embodiments of the invention will now be described by way of example only and with reference to the accompanying drawings, in which:
-
FIG. 1 is a right side elevational view of a motorcycle with an exhaust device according to a first embodiment of the present invention; -
FIG. 2 is a plan view of an exhaust device according to a first embodiment of the present invention; -
FIG. 3 is a view taken alongarrow 3 inFIG. 2 ; -
FIG. 4 is a view taken alongarrow 4 inFIG. 3 , illustrating a silencer; -
FIG. 5 is a plan view, partly cut away, showing an internal structure of the silencer; -
FIG. 6 is a cross-sectional view taken along line 6-6 ofFIG. 4 ; -
FIG. 7 is a cross-sectional view taken along line 7-7 ofFIG. 4 ; -
FIG. 8 is a view illustrating the manner in which the exhaust device according to a first embodiment of the present invention operates; -
FIG. 9 is a view showing a modification of the structure shown inFIG. 6 ; -
FIG. 10 is a vertical cross-sectional view of an exhaust device according to a second embodiment; -
FIG. 11 is a horizontal cross-sectional view of the exhaust device according to the second embodiment; and -
FIG. 12 is an enlarged view ofregion 12 shown inFIG. 10 . - Preferred embodiments of the present invention will be described in detail below. In the drawings and embodiments, terms such as "upward", "downward", "forward", "rearward", "leftward", and "rightward" represent directions as viewed from the rider of a motorcycle.
- A first embodiment of the present invention will now be described with reference to the drawings.
- As shown in
FIG. 1 , amotorcycle 10 has avehicle body frame 11, a frontwheel steering assembly 13 steerably mounted at the front of thevehicle body frame 11, arear suspension assembly 14 swingably mounted on thevehicle body frame 11, anengine 17 suspended from thevehicle body frame 11 between afront wheel 15 and arear wheel 16, afuel tank 18 placed on thevehicle body frame 11 upwardly of theengine 17, and aseat 19, for the rider to sit thereon, mounted on thevehicle body frame 11 behind thefuel tank 18. The frontwheel steering assembly 13 has thefront wheel 15, afront fork 20 supporting thefront wheel 15 thereon, and asteering handle 21 mounted on thefront fork 20. Therear suspension assembly 14 has aswing arm 23 swingably extending rearwardly from apivot member 22 and therear wheel 16 rotatably mounted on a rear end portion of theswing arm 23. - The
engine 17 that is suspended from thevehicle body frame 11 includes acrankcase 25, acylinder block 26 extending obliquely forwardly and upwardly from thecrankcase 25, and acylinder head 27 mounted on thecylinder block 26. In the present embodiment, theengine 17 is an in-line four-cylinder engine. - An
intake device 28 is connected to arear surface 27b of thecylinder head 27, and anexhaust device 29 is connected to afront surface 27a of thecylinder head 27. Theexhaust device 29 of theengine 17 includes anexhaust pipe 31 extending from thefront surface 27a of thecylinder head 27, for guiding exhaust gas from theengine 17, and asilencer 32 connected to a downstream side of theexhaust pipe 31, for reducing exhaust sounds and discharging the exhaust gas out of theexhaust device 29. Theexhaust device 29 has lateral and lower sides covered with an undercover 33 below theengine 17. - The structure of the exhaust device will now be described.
- As shown in
FIG. 2 , theexhaust device 29 has as its main components a firstupstream exhaust pipe 41, a secondupstream exhaust pipe 42, a thirdupstream exhaust pipe 43, and a fourthupstream exhaust pipe 44 which are each connected to the exhaust ports of the engine, anexhaust manifold 45 connected to the downstream ends of the firstupstream exhaust pipe 41, the secondupstream exhaust pipe 42, the third upstreamexhaust pipe 43, and the fourthupstream exhaust pipe 44, and thesilencer 32, which is of a substantially rectangular shape, connected to the rear end of theexhaust manifold 45.Flanges upstream exhaust pipe 41, the secondupstream exhaust pipe 42, the thirdupstream exhaust pipe 43, and the fourthupstream exhaust pipe 44 to theengine 17 are mounted to the upstream ends of the firstupstream exhaust pipe 41, the secondupstream exhaust pipe 42, the thirdupstream exhaust pipe 43, and the fourthupstream exhaust pipe 44. Two silencer stays 51 for supporting thesilencer 32 on the vehicle body frame are mounted on anupper surface 32a of thesilencer 32. - As shown in
FIG. 3 , amanifold collar 52 is interposed between the firstupstream exhaust pipe 41, the secondupstream exhaust pipe 42, the thirdupstream exhaust pipe 43, and the fourthupstream exhaust pipe 44, and theexhaust manifold 45, and joins them together. Theexhaust manifold 45 includes twohalves upstream oxygen sensor 53 for detecting an oxygen component in the exhaust gas is mounted on theexhaust manifold 45 at a position near its rear end. - The
silencer 32 includes alower half 32A and anupper half 32B covering thelower half 32A from above. Theupper half 32B has arecess 55 defined in an upper surface thereof. A downstream oxygen sensor 54 (hereinafter also referred to as "oxygen sensor 54") for detecting an oxygen component in the exhaust gas is mounted in therecess 55. - The internal structure, etc. of the
silencer 32 will be described below. - As shown in
FIGS. 4 and5 , thesilencer 32 houses therein afirst separator 57 extending transversely therein and asecond separator 58 extending transversely therein behind thefirst separator 57. Thefirst separator 57 and thesecond separator 58 define three expansion chambers in thesilencer 32 wherein the exhaust gas expands. - The
exhaust pipe 31, which has acatalyst 50 disposed therein for purifying the exhaust gas, extends into theexpansion chambers 60 positioned within thesilencer 32. Thesilencer 32 has a front wall 32aa, on which is mounted afront catalyst holder 67 that supports the front end of thecatalyst 50. Arear catalyst holder 65 that supports the rear end of thecatalyst 50 is mounted on thefirst separator 57. Thefront catalyst holder 67 and therear catalyst holder 65 support thecatalyst 50. Acap 66, which is of a substantially frustoconical shape as viewed in side elevation and which is formed from a perforated plate for diffusing and discharging the exhaust gas purified by thecatalyst 50, is mounted on the downstream end of thecatalyst 50. - The upstream oxygen sensor 53 (see
FIG. 3 ) is positioned upstream of thecatalyst 50, whereas thedownstream oxygen sensor 54 is positioned downstream of thecatalyst 50. - The three
expansion chambers 60 include afirst expansion chamber 61, asecond expansion chamber 62 disposed downstream of thefirst expansion chamber 61, and athird expansion chamber 63 disposed downstream of thesecond expansion chamber 62. These expansion chambers are arranged successively in the order from thethird expansion chamber 63 to thefirst expansion chamber 61 to thesecond expansion chamber 62 in the longitudinal direction of thesilencer 32, from front to back. Thethird expansion chamber 63 and thefirst expansion chamber 61 are separated from one another by thefirst separator 57, and thefirst expansion chamber 61 and thesecond expansion chamber 62 are separated from one another by thesecond separator 58. - The
first expansion chamber 61 and thesecond expansion chamber 62 are connected to each other by a firstfluid communication pipe 71 that is supported by thesecond separator 58. Thesecond expansion chamber 62 and thethird expansion chamber 63 are connected to each other by a secondfluid communication pipe 72 that is supported by thefirst separator 57 and thesecond separator 58. Thethird expansion chamber 63 is vented to the outside by a thirdfluid communication pipe 73 that is supported by thefirst separator 57 and thesecond separator 58 and atail pipe 74 that extends from the downstream end of the thirdfluid communication pipe 73 and that is supported by thesecond separator 58 and theupper half 32B of thesilencer 32. - The exhaust gas that has passed through the downstream end of the
catalyst 50 passes through thecap 66, expands in thefirst expansion chamber 61, passes through the firstfluid communication pipe 71 that is disposed in thefirst expansion chamber 61, and reaches thesecond expansion chamber 62. The exhaust gas then expands in thesecond expansion chamber 62, passes through the secondfluid communication pipe 72, and reaches thethird expansion chamber 63. The exhaust gas then expands in thethird expansion chamber 63, passes through the thirdfluid communication pipe 73, then passes through thetail pipe 74 that is connected to the rear end of the thirdfluid communication pipe 73 and is discharged out of thesilencer 32. - As shown in
FIG. 6 , thesecond separator 58 that separates thefirst expansion chamber 61 and thesecond expansion chamber 62 is disposed in thesilencer 32. Thesecond separator 58 has asupport hole 76 defined in an upper portion thereof, and the firstfluid communication pipe 71 is disposed in thesupport hole 76 such that the axis of the firstfluid communication pipe 71 extends generally horizontally. The firstfluid communication pipe 71 has an upstream end with alip 77 that flares radially outwardly for guiding the exhaust gas stirred in thefirst expansion chamber 61 smoothly into the firstfluid communication pipe 71. - The
recess 55 which is downwardly depressed is defined in theupper surface 32a of thesilencer 32 at a position corresponding to thefirst expansion chamber 61. Theoxygen sensor 54 is disposed in therecess 55. Aboss 82 having an internally threadedsurface 78 with which theoxygen sensor 54 is held in threaded engagement is welded in therecess 55. Since theoxygen sensor 54 is mounted on thesilencer 32 by theboss 82, the strength with which theoxygen sensor 54 is supported is ensured. Theoxygen sensor 54 has on its lower end anelement 83 serving as an oxygen detector which is disposed at such a height that theelement 83 faces an inside-diameter region 71 u (opening 71 k) of the firstfluid communication pipe 71. - Specifically, the
oxygen sensor 54 for detecting an oxygen component in the exhaust gas is disposed downstream of thecatalyst 50 and faces theopening 71 k of the firstfluid communication pipe 71. Theoxygen sensor 54 is provided in thefirst expansion chamber 61 that is positioned upstream of the firstfluid communication pipe 71. - As shown in
FIG. 7 , theoxygen sensor 54 is disposed outwardly of adownstream edge 31 b of theexhaust pipe 31 when theexhaust pipe 31 is viewed along the longitudinal axis thereof. In particular, theoxygen sensor 54 is disposed upwardly of thedownstream edge 31 b of theexhaust pipe 31. - As shown in
FIG. 8 , thefirst separator 57 has afirst drain hole 86 defined in the lower end thereof for draining water, and thesecond separator 58 has asecond drain hole 87 defined in the lower end thereof for draining water. Thethird expansion chamber 63 has adrain hole 88 for draining water. - The
silencer 32 includes a bottom 32s having a slantedportion 89 which is slanted rearwardly and upwardly such that the height of thefirst drain hole 86 is greater than the height of thedrain hole 88 and the height of thesecond drain hole 87 is greater than the height of thefirst drain hole 86. When the temperature of thesilencer 32 drops, water which condenses in thesecond expansion chamber 62 falls onto the slantedportion 89 and flows along the slantedportion 89 through thesecond drain hole 87 into thefirst expansion chamber 61. The water that has flowed from thesecond expansion chamber 62 into thefirst expansion chamber 61 and water condensed in thefirst expansion chamber 61 flow downwardly along the slantedportion 89 through thefirst drain hole 86 into thethird expansion chamber 63. The water that has flowed from thefirst expansion chamber 61 into thethird expansion chamber 63 along the slantedportion 89 and water condensed in thethird expansion chamber 63 is discharged out of thesilencer 32 through thedrain hole 88. The water that is collected on the bottom 32s of thesilencer 32 can easily be drained out of thesilencer 32 by the acceleration of the vehicle when it starts to move as well as the slantedportion 89 that is slanted rearwardly. - Operation of the exhaust device of the engine which is provided with the oxygen sensors described above will be described below.
- As shown in
FIGS. 5 and6 , theexhaust pipe 31 includes thefront catalyst holder 67 and thecatalyst 50, and extends into thefirst expansion chamber 61 of thesilencer 32 in which the exhaust gas expands. - The exhaust gas discharged from the
exhaust pipe 31 expands in thefirst expansion chamber 61, passes from thefirst expansion chamber 61 through the firstfluid communication pipe 71, and then expands in thesecond expansion chamber 62. At this time, the exhaust gas stirred in thefirst expansion chamber 61 is brought into contact with theoxygen sensor 54 that is disposed in facing relation to theopening 71 k of the firstfluid communication pipe 71. - Since the
oxygen sensor 54 is disposed outwardly of the extension of thedownstream edge 31 b (seeFIG. 7 ) of theexhaust pipe 31, the exhaust gas that has passed through thecap 66 and has been stirred in thefirst expansion chamber 61 is brought into contact with theoxygen sensor 54. Therefore, as the exhaust gas that is brought into contact with theoxygen sensor 54 has been sufficiently stirred and uniformized, it is possible to ascertain the state of thecatalyst 50 more accurately. - Given that the state of the
catalyst 50 can be ascertained more accurately, the service life of thecatalyst 50 can be determined to a nicety. - As shown in
FIG. 7 , theoxygen sensor 54 is disposed outwardly of thedownstream edge 31 b of theexhaust pipe 31 when theexhaust pipe 31 is viewed along alongitudinal axis 31X thereof. Thus, exhaust gas discharged from theexhaust pipe 31 and having its temperature increased is less likely to be brought into direct contact with theoxygen sensor 54. Therefore, when the temperature of thesilencer 32 drops, water produced by thermal condensation is less liable to be deposited on theoxygen sensor 54. As a result, deterioration of theoxygen sensor 54 is reduced, and durability of theoxygen sensor 54 is increased. - The
oxygen sensor 54 is disposed upwardly of thedownstream edge 31 b of theexhaust pipe 31. When theengine 17 is shut down and the temperature in theexhaust pipe 31 drops, water contained in a gas in theexhaust pipe 31 may condense in theexhaust pipe 31. The condensed water is directed downwardly. Since theoxygen sensor 54 is disposed upwardly of thedownstream edge 31 b of theexhaust pipe 31, it is less likely that the condensed water will be deposited directly on theoxygen sensor 54. As a consequence, theoxygen sensor 54 has its service life increased. - Referring back to
FIG. 6 , theoxygen sensor 54 is disposed in therecess 55 defined in theupper surface 32a of thesilencer 32. With theoxygen sensor 54 disposed in therecess 55, components that are disposed above thesilencer 32 can be lowered. As a result, the vehicle may have its centre of gravity lowered. - The
oxygen sensor 54 is provided in thefirst expansion chamber 61 that is positioned upstream of the firstfluid communication pipe 71. As thefirst expansion chamber 61 is farther from anoutlet 32d (seeFIG. 5 ) of thesilencer 32 than thesecond expansion chamber 62, even if ambient air flows back into thesilencer 32, any adverse effect that the ambient air has on data detected by theoxygen sensor 54 can be reduced. Therefore, the state of the catalyst 50 (seeFIG. 5 ) can be ascertained more accurately. - Referring back to
FIG. 8 , thesilencer 32 has thethird expansion chamber 63 that is separate from thefirst expansion chamber 61 that is provided with theoxygen sensor 54, and thedrain hole 88 is provided in thethird expansion chamber 63. When the temperature of thesilencer 32 drops, water condensed in thefirst expansion chamber 61 flows out through thedrain hole 88 in thethird expansion chamber 63. As water is less likely to remain in thefirst expansion chamber 61, therefore, deterioration of theoxygen sensor 54 is reduced. As a result, the service life of theoxygen sensor 54 can be extended. - A modification of the structure shown in
FIG. 6 will be described below. - As shown in
FIG. 9 , thesecond separator 58 that separates thefirst expansion chamber 61 and thesecond expansion chamber 62 is disposed in thesilencer 32, and has thesupport hole 76 defined in the upper portion thereof. The firstfluid communication pipe 71 is disposed in thesupport hole 76 such that the axis of the firstfluid communication pipe 71 extends generally horizontally. - The modification differs from the first embodiment in that the downwardly
depressed recess 55 is defined in theupper surface 32a of thesilencer 32 at a position corresponding to thesecond expansion chamber 62, and theoxygen sensor 54 is disposed in therecess 55. In other words, theoxygen sensor 54 is disposed downstream of the firstfluid communication pipe 71 through which the exhaust gas flows. Other details of the modification are not different from those of the first embodiment, and will not be described in detail below. - Operation of the modification will be described below.
- The exhaust gas discharged from the
exhaust pipe 31 expands in thefirst expansion chamber 61, passes from thefirst expansion chamber 61 through the firstfluid communication pipe 71, and is then expanded in thesecond expansion chamber 62. At this time, the exhaust gas stirred in thefirst expansion chamber 61 is brought into contact with theoxygen sensor 54 that is disposed in facing relation to theopening 71k of the firstfluid communication pipe 71. Since theoxygen sensor 54 is disposed outwardly of the extension of thedownstream edge 31 b (seeFIG. 7 ) of theexhaust pipe 31, the exhaust gas that is brought into contact with theoxygen sensor 54 has been sufficiently stirred and uniformized in thefirst expansion chamber 61. Therefore, as the exhaust gas that has been sufficiently stirred and uniformized is brought into contact with theoxygen sensor 54, it is possible to ascertain the state of the catalyst 50 (seeFIG. 5 ) more accurately. - Since the
oxygen sensor 54 is disposed outwardly of the extension of thedownstream edge 31 b of theexhaust pipe 31, the exhaust gas that has been sufficiently stirred and uniformized in thefirst expansion chamber 61 is brought into contact with theoxygen sensor 54. Therefore, as the exhaust gas that has been sufficiently stirred and uniformized is brought into contact with theoxygen sensor 54, the service life of thecatalyst 50 can be determined to a nicety. - The
oxygen sensor 54 is disposed outwardly of thedownstream edge 31 b of theexhaust pipe 31 when theexhaust pipe 31 is viewed along thelongitudinal axis 31X (seeFIG. 7 ) thereof. The exhaust gas discharged from theexhaust pipe 31 and having its temperature increased is less likely to be brought into direct contact with theoxygen sensor 54. Therefore, when the temperature of thesilencer 32 drops, water produced by thermal condensation is less liable to be deposited on theoxygen sensor 54. As a result, deterioration of theoxygen sensor 54 can be reduced, and durability of theoxygen sensor 54 can be increased. - Furthermore, the
oxygen sensor 54 is provided in thesecond expansion chamber 62 that is positioned downstream of the firstfluid communication pipe 71. As thesecond expansion chamber 62 is farther from theoutlet 32d (seeFIG. 5 ) of thesilencer 32 than the third expansion chamber 63 (seeFIG. 5 ) along the length of the exhaust route starting from theoutlet 32d of thesilencer 32, even if ambient air flows back into thesilencer 32 due to a turbulent flow of the exhaust gas, any adverse effect that the ambient air has on data detected by theoxygen sensor 54 is reduced. Therefore, the state of the catalyst 50 (seeFIG. 5 ) can be ascertained more accurately. Other operational details are the same as those of the first embodiment and will not be described below. - A second embodiment of the present invention will be described below with reference to the drawings.
- As shown in
FIGS. 10 and11 , anexhaust device 29 includes anexhaust pipe 31 and asilencer 32 connected to the downstream side of theexhaust pipe 31. Theexhaust pipe 31 includes acatalyst 50 for purifying an exhaust gas. - The
silencer 32 has an increasing-diameter portion 91, anouter tube 92 connected to the rear end of the increasing-diameter portion 91 and extending rearwardly, aninner tube 93 disposed coaxially within theouter tube 92, aninner lid 94 closing off the rear end of theinner tube 93, and anouter lid 95 fitted in theouter tube 92 from behind the outer side of theinner lid 94. Theinner tube 93 has afirst separator 57, asecond separator 58, and athird separator 59 housed therein. Thefirst separator 57, thesecond separator 58, and thethird separator 59 extend perpendicularly to the longitudinal axis of theinner tube 93 at spaced intervals, and divide anexpansion chamber 60 defined in thesilencer 32, wherein the exhaust gas expands, into compartments. Thefirst separator 57, thesecond separator 58, and thethird separator 59 extend generally perpendicularly to the longitudinal axis of thesilencer 32. Theexpansion chamber 60 is divided into four expansion chambers by thefirst separator 57, thesecond separator 58, and thethird separator 59. - The
expansion chamber 60 includes afirst expansion chamber 61, asecond expansion chamber 62 disposed downstream of thefirst expansion chamber 61, athird expansion chamber 63 disposed downstream of thesecond expansion chamber 62, and afourth expansion chamber 64 disposed downstream of thethird expansion chamber 63. Thefirst expansion chamber 61, thefourth expansion chamber 64, thethird expansion chamber 63, and thesecond expansion chamber 62 are arranged longitudinally successively in that order in thesilencer 32 from front to back. Thefirst expansion chamber 61 and thesecond expansion chamber 62 are held in fluid communication with each other by a firstfluid communication pipe 71 extending through thefirst separator 57, thesecond separator 58, and thethird separator 59 and supported by thefirst separator 57, thesecond separator 58, and thethird separator 59. Thesecond expansion chamber 62 and thethird expansion chamber 63 are held in fluid communication with each other by a secondfluid communication pipe 72 extending through thethird separator 59 and supported by thethird separator 59. Thethird expansion chamber 63 and thefourth expansion chamber 64 are held in fluid communication with each other by a thirdfluid communication pipe 73 extending through thesecond separator 58 and supported by thesecond separator 58. Thefourth expansion chamber 64 is vented to the outside by two fourthfluid communication pipes third separators third separators perforated plate 98 is located between thefirst separator 57 and the increasing-diameter portion 91. - The exhaust gas that has passed through the downstream end of the
catalyst 50 expands in thefirst expansion chamber 61 wherein theperforated plate 98 is located, passes through the firstfluid communication pipe 71 provided in thefirst expansion chamber 61, and reaches thesecond expansion chamber 62. The exhaust gas expands in thesecond expansion chamber 62, and the exhaust gas that has expanded in thesecond expansion chamber 62 passes through the secondfluid communication pipe 72, and reaches thethird expansion chamber 63. The exhaust gas expands in thethird expansion chamber 63, and thereafter passes through the thirdfluid communication pipe 73, then passes through the two fourthfluid communication pipes fluid communication pipe 73, and is discharged out of thesilencer 32. - The
exhaust pipe 31, which houses acatalyst 50 disposed in the rear end thereof, extends into the increasing-diameter portion 91 that defines thefirst expansion chamber 61. Anoxygen sensor 54 for detecting an oxygen component in the exhaust gas is mounted on the increasing-diameter portion 91 of thesilencer 32 downstream of thecatalyst 50. Theoxygen sensor 54 is disposed outwardly of thedownstream edge 31b of theexhaust pipe 31 when theexhaust pipe 31 is viewed along the longitudinal axis thereof. Theoxygen sensor 54 is provided in thefirst expansion chamber 61 and disposed upwardly of thedownstream edge 31 b of theexhaust pipe 31. - As shown in
FIG. 12 , aboss 82 having an internally threadedsurface 78 with which theoxygen sensor 54 is held in threaded engagement is welded to a portion of the increasing-diameter portion 91 which corresponds to thefirst expansion chamber 61. Since theoxygen sensor 54 is mounted on thesilencer 32 by theboss 82, the strength with which theoxygen sensor 54 is supported can be ensured. Theoxygen sensor 54 has on its lower end anelement 83 serving as an oxygen detector. Theelement 83 is disposed outwardly of thedownstream edge 31 b (seeFIG. 10 ) of theexhaust pipe 31. - The operation of the second embodiment will be described below.
- Referring back to
FIG. 10 , theexhaust pipe 31 extends into thefirst expansion chamber 61 of thesilencer 32 in which the exhaust gas expands. The exhaust gas discharged from theexhaust pipe 31 expands in thefirst expansion chamber 61. At this time, the exhaust gas that has been stirred in thefirst expansion chamber 61 is brought into contact with theoxygen sensor 54 that is disposed outwardly of thedownstream edge 31 b of theexhaust pipe 31 when theexhaust pipe 31 is viewed along thelongitudinal axis 31X thereof. - Since the
oxygen sensor 54 is disposed outwardly of the extension of thedownstream edge 31 b of theexhaust pipe 31, exhaust gas that has been sufficiently stirred and uniformized in thefirst expansion chamber 61 is brought into contact with theoxygen sensor 54. Therefore, as the exhaust gas that has been sufficiently stirred and uniformized is brought into contact with theoxygen sensor 54, it is possible to ascertain the state of thecatalyst 50 more accurately. - The
oxygen sensor 54 is disposed outwardly of thedownstream edge 31 b of theexhaust pipe 31 when theexhaust pipe 31 is viewed along the longitudinal axis thereof. The exhaust gas discharged from theexhaust pipe 31 and having its temperature increased is thus less likely to be brought into direct contact with theoxygen sensor 54. Therefore, when the temperature of thesilencer 32 drops, water produced by thermal condensation is less liable to be deposited on theoxygen sensor 54. As a result, deterioration of theoxygen sensor 54 can be reduced, and durability of theoxygen sensor 54 can be increased. - The
oxygen sensor 54 is disposed upwardly of thedownstream edge 31 b of theexhaust pipe 31. When theengine 17 is shut down and the temperature in theexhaust pipe 31 drops, water contained in a gas in theexhaust pipe 31 may condense in theexhaust pipe 31. The condensed water is directed downwardly. Since theoxygen sensor 54 is disposed upwardly of thedownstream edge 31 b of theexhaust pipe 31, the condensed water is less likely to be deposited directly on theoxygen sensor 54. As a consequence, theoxygen sensor 54 can have its service life increased. - The
oxygen sensor 54 is provided in thefirst expansion chamber 61. As thefirst expansion chamber 61 is farther from theoutlet 32d of thesilencer 32 than thesecond expansion chamber 62, even if ambient air flows back into thesilencer 32 due to a turbulent flow of the exhaust gas, any adverse effect that the ambient air has on data detected by theoxygen sensor 54 can be reduced. Therefore, the state of thecatalyst 50 can be ascertained more accurately. - The structure of the exhaust device has been described above. The exhaust device that has been described is a left one of a pair of left and right exhaust devices. The right exhaust device has a structure which is bilaterally symmetric with respect to the lateral centreline of the vehicle across the transverse directions thereof, and operates in the same manner and offers the same advantages as the left exhaust device Therefore, the right exhaust device will not be described herein.
- The present invention has been described as applied to a motorcycle. However, the present invention is also applicable to a three-wheeled vehicle and may also be applied to vehicles in general.
- The present invention is preferably applicable to a motorcycle wherein an exhaust device for an engine is provided with an oxygen sensor.
Claims (5)
- An exhaust device for an engine, comprising an exhaust pipe (31) for guiding an exhaust gas from the engine (17) and a silencer (32) connected to a downstream side of the exhaust pipe (31), for reducing exhaust sounds and discharging the exhaust gas out of the exhaust device, wherein
said exhaust pipe (31) includes a catalyst (50) for purifying the exhaust gas; said silencer (32) includes an expansion chamber (60) in which the exhaust gas expands;
said exhaust pipe (31) extends into said expansion chamber (60);
said expansion chamber (60) includes a first expansion chamber (61) and a second expansion chamber (62) downstream of said first expansion chamber (61);
said first expansion chamber (61) and said second expansion chamber (62) are connected to each other by a first fluid communication pipe (71);
said exhaust device includes an oxygen sensor (54) for detecting an oxygen component in the exhaust gas, said oxygen sensor (54) being disposed downstream of said catalyst (50) in facing relation to an opening of said first fluid communication pipe (71); and
said oxygen sensor (54) is disposed outwardly of a downstream edge of said exhaust pipe (31) when said exhaust pipe (31) is viewed along a longitudinal axis thereof. - The exhaust device for an engine according to claim 1, wherein said oxygen sensor (54) is disposed upwardly of the downstream edge of said exhaust pipe (31).
- The exhaust device for an engine according to claim 1 or 2, wherein said silencer (32) has a recess (55) defined in an upper surface thereof; and
said oxygen sensor (54) is disposed in said recess (55). - The exhaust device for an engine according to any preceding claim, wherein said oxygen sensor (54) is provided in said first expansion chamber (61) which is upstream of said first fluid communication pipe (71).
- The exhaust device for an engine according to any preceding claim, wherein said expansion chamber (60) included in said silencer (32) further includes a third expansion chamber (63) disposed downstream of said second expansion chamber (62); and
said third expansion chamber (63) has a drain hole (88) for draining water.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP2015043650A JP6333199B2 (en) | 2015-03-05 | 2015-03-05 | Engine exhaust system |
Publications (2)
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EP3064722B1 EP3064722B1 (en) | 2018-10-24 |
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EP16150653.0A Active EP3064722B1 (en) | 2015-03-05 | 2016-01-08 | Exhaust device for engine |
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Cited By (10)
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WO2019015845A1 (en) * | 2017-07-19 | 2019-01-24 | Bayerische Motoren Werke Aktiengesellschaft | Exhaust gas system for an internal combustion engine |
EP3450710A1 (en) * | 2017-08-28 | 2019-03-06 | Yamaha Hatsudoki Kabushiki Kaisha | Straddled vehicle |
CN109458247A (en) * | 2018-10-22 | 2019-03-12 | 济南轻骑摩托车有限公司 | A kind of special-shaped noise eliminator of motorcycle of large-duty engine |
DE102017219721A1 (en) * | 2017-11-07 | 2019-05-09 | Bayerische Motoren Werke Aktiengesellschaft | Exhaust tract for an internal combustion engine of a motor vehicle and motor vehicle |
WO2019138427A1 (en) * | 2018-01-12 | 2019-07-18 | Hero MotoCorp Limited | Exhaust system of an internal combustion engine |
EP3348806A4 (en) * | 2015-12-18 | 2019-07-24 | Kawasaki Jukogyo Kabushiki Kaisha | Saddle-type vehicle |
US10473019B2 (en) | 2017-01-16 | 2019-11-12 | Suzuki Motor Corporation | Exhaust gas sensor mounting structure |
US10619538B2 (en) | 2017-01-16 | 2020-04-14 | Suzuki Motor Corporation | Exhaust device of engine |
CN111919017A (en) * | 2018-03-29 | 2020-11-10 | 本田技研工业株式会社 | Exhaust device for internal combustion engine |
US11753973B2 (en) | 2021-05-19 | 2023-09-12 | Suzuki Motor Corporation | Exhaust apparatus |
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JP6620677B2 (en) * | 2016-06-03 | 2019-12-18 | スズキ株式会社 | Exhaust gas sensor layout |
TWI732971B (en) * | 2016-12-09 | 2021-07-11 | 日商東亞合成股份有限公司 | Adhesive composition and its utilization |
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JP7059792B2 (en) * | 2017-06-23 | 2022-04-26 | スズキ株式会社 | Exhaust gas sensor layout structure and motorcycle |
JP6793098B2 (en) * | 2017-07-26 | 2020-12-02 | 本田技研工業株式会社 | Exhaust system and saddle-mounted vehicle |
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EP1408209A1 (en) * | 2002-10-11 | 2004-04-14 | Toyota Jidosha Kabushiki Kaisha | Exhaust pipe structure |
WO2005075805A1 (en) | 2004-02-09 | 2005-08-18 | Yamaha Hatsudoki Kabushiki Kaisha | Exhaust gas purifying device for engine |
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EP3348806A4 (en) * | 2015-12-18 | 2019-07-24 | Kawasaki Jukogyo Kabushiki Kaisha | Saddle-type vehicle |
US10473019B2 (en) | 2017-01-16 | 2019-11-12 | Suzuki Motor Corporation | Exhaust gas sensor mounting structure |
US10619538B2 (en) | 2017-01-16 | 2020-04-14 | Suzuki Motor Corporation | Exhaust device of engine |
WO2019015845A1 (en) * | 2017-07-19 | 2019-01-24 | Bayerische Motoren Werke Aktiengesellschaft | Exhaust gas system for an internal combustion engine |
US11421576B2 (en) | 2017-07-19 | 2022-08-23 | Bayerische Motoren Werke Aktiengesellschaft | Exhaust gas system for an internal combustion engine |
EP3450710A1 (en) * | 2017-08-28 | 2019-03-06 | Yamaha Hatsudoki Kabushiki Kaisha | Straddled vehicle |
DE102017219721A1 (en) * | 2017-11-07 | 2019-05-09 | Bayerische Motoren Werke Aktiengesellschaft | Exhaust tract for an internal combustion engine of a motor vehicle and motor vehicle |
WO2019138427A1 (en) * | 2018-01-12 | 2019-07-18 | Hero MotoCorp Limited | Exhaust system of an internal combustion engine |
CN111919017A (en) * | 2018-03-29 | 2020-11-10 | 本田技研工业株式会社 | Exhaust device for internal combustion engine |
EP3779138A4 (en) * | 2018-03-29 | 2021-04-28 | Honda Motor Co., Ltd. | Exhaust device for internal combustion engine |
CN109458247A (en) * | 2018-10-22 | 2019-03-12 | 济南轻骑摩托车有限公司 | A kind of special-shaped noise eliminator of motorcycle of large-duty engine |
US11753973B2 (en) | 2021-05-19 | 2023-09-12 | Suzuki Motor Corporation | Exhaust apparatus |
Also Published As
Publication number | Publication date |
---|---|
JP6333199B2 (en) | 2018-05-30 |
JP2016160915A (en) | 2016-09-05 |
EP3064722B1 (en) | 2018-10-24 |
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