JP5644124B2 - Exhaust gas sensor mounting structure for motorcycles - Google Patents

Exhaust gas sensor mounting structure for motorcycles Download PDF

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Publication number
JP5644124B2
JP5644124B2 JP2010021102A JP2010021102A JP5644124B2 JP 5644124 B2 JP5644124 B2 JP 5644124B2 JP 2010021102 A JP2010021102 A JP 2010021102A JP 2010021102 A JP2010021102 A JP 2010021102A JP 5644124 B2 JP5644124 B2 JP 5644124B2
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Prior art keywords
exhaust gas
gas sensor
exhaust
horizontal
vehicle
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JP2011157891A (en
Inventor
佳克 秋田
佳克 秋田
山田 伸一
伸一 山田
謙 柴野
謙 柴野
剛 村松
剛 村松
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スズキ株式会社
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00Component parts, details or accessories, not otherwise provided for
    • F02B77/08Safety, indicating or supervising devices
    • F02B77/085Safety, indicating or supervising devices with sensors measuring combustion processes, e.g. knocking, pressure, ionization, combustion flame
    • F02B77/086Sensor arrangements in the exhaust, e.g. for temperature, misfire, air/fuel ratio, oxygen sensors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/008Mounting or arrangement of exhaust sensors in or on exhaust apparatus
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62KCYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K2202/00Motorised scooters
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2590/00Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/04Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for motorcycles

Description

  The present invention relates to a motorcycle exhaust gas sensor mounting structure for mounting an exhaust gas sensor on an exhaust pipe of a motorcycle.

  Patent Document 1 discloses an exhaust gas sensor attached to an exhaust pipe extending from an engine of a motorcycle to detect the oxygen concentration in the exhaust gas. In Patent Document 1, the exhaust gas sensor is disposed on the side of the cylinder block and in the space in front of the right bulge portion of the crankcase.

JP 2000-335467 A

  In a scooter type vehicle equipped with a swing type power unit, when an exhaust gas sensor is arranged at the position described in Patent Document 1, the exhaust gas sensor may come into contact with body parts (body frame, body cover, etc.) when the power unit swings. Yes, the exhaust gas sensor may be damaged, causing the engine to malfunction.

  Further, when the exhaust gas sensor is disposed at the position described in Patent Document 1, particularly when the engine has a small displacement, the exhaust gas sensor cannot secure the sensor activation temperature only by the heat of the exhaust gas from the engine. The heater is used. However, if a heater is used, the capacity of the generator must be increased by the amount of power supplied to the heater, so that the generator is increased in size, leading to an increase in the size of the engine and an increase in mechanical loss.

  An object of the present invention has been made in consideration of the above-described circumstances, and is capable of preventing interference between an exhaust gas sensor and vehicle body parts and mounting an exhaust gas sensor for a motorcycle that can protect the exhaust gas sensor from a stepping stone during traveling of the vehicle. To provide a structure.

The present invention relates to a power unit in which an engine in which a cylinder assembly extends forwardly from a crankcase and a transmission device in which a rear wheel is pivotally supported at a rear part, and the power unit in a vertical direction with respect to a vehicle body frame. A support shaft provided at the front lower side of the crankcase that is swingably supported, an exhaust pipe connected to an exhaust port provided in a cylinder head of the cylinder assembly and extending rearward, and an exhaust gas state. A motorcycle having an exhaust gas sensor for detection, wherein the exhaust pipe includes a vertical portion extending directly below from the exhaust port, and a horizontal front portion bent thereafter and extending horizontally in one side of the vehicle width direction. , then bent to rearward along the vehicle side horizontal post portion extending in a horizontal direction is configured by continuously provided, the exhaust gas sensor, the crankcase Scan is positioned directly below the cylinder assembly in front of, and while being mounted on a rear surface of the horizontal front portion of the exhaust pipe in the front above the support shaft for supporting the power unit, approaching its terminal portions to the lower surface of the power unit Thus, it is arranged to be inclined toward the rear upper direction .

  According to the present invention, since the exhaust gas sensor is mounted on the exhaust pipe directly under the cylinder assembly, the exhaust gas sensor can be accommodated in a space surrounded by the engine and the exhaust pipe, and thus interference between the exhaust gas sensor and the vehicle body part can be prevented. . Further, since the terminal portion of the exhaust gas sensor is arranged upward, the exhaust pipe is positioned below the exhaust gas sensor, and the exhaust gas sensor can be protected from a stepping stone or the like when the vehicle travels.

1 is a left side view showing a scooter type motorcycle to which an embodiment of an exhaust gas sensor mounting structure for a motorcycle according to the present invention is applied. The left view which shows the power unit of FIG. 1 with an exhaust pipe, an exhaust gas sensor, etc. FIG. The right view which shows the power unit of FIG. 1 with an exhaust pipe, an exhaust gas sensor, etc. FIG. FIG. 4 is an IV perspective view of FIG. 3.

  The best mode for carrying out the present invention will be described below with reference to the drawings. However, the present invention is not limited to these embodiments.

  FIG. 1 is a left side view showing a scooter type motorcycle to which an embodiment of the exhaust gas sensor mounting structure for a motorcycle according to the present invention is applied. In the present embodiment, front / rear, left / right, and upper / lower expressions are based on the driver when riding the vehicle.

  The scooter type motorcycle 10 includes an underbone body frame 11. The vehicle body frame 11 is configured such that an underframe 13 extends downward from a rear portion of a steering pipe 12 at the frontal portion, and a seat rail 14 extends obliquely upward and rearward from a lower portion of the underframe 13. .

  A front fork 15 is supported on the steering pipe 12 so as to be rotatable left and right together with a handle bar 16, and a front wheel 17 is pivotally supported at the front end of the front fork 15. On the other hand, a power unit 19 is pivotally supported at the center of the lower portion of the under frame 13 via a swing bracket 18 so as to swing up and down around a pivot shaft 20 as a support shaft.

  The power unit 19 is generally used for a scooter, and an engine 21 and a transmission device 22 are integrally formed, and a rear wheel 23 is directly supported on the rear portion of the transmission device 22. A rear cushion unit 24 is stretched up and down between the rear portion of the transmission device 22 and the seat rail 14, and the power unit 19 and the rear wheel 23 are buffered and suspended by the rear cushion unit 24.

  Here, as shown in FIG. 2, a pair of left and right frame support portions 42 are integrally extended forward from the lower portion of the crankcase 27 of the engine 21 constituting the power unit 19. The front ends of these frame support portions 42 are rotatably connected to a pivot shaft 20 that extends from the rear end of the swing bracket 18 along the vehicle width direction. As a result, the power unit 19 is pivotally supported around the pivot shaft 20 via the swing bracket 18 with respect to the underframe 13 as shown in FIG.

  A seating seat 25 is placed on the body frame 11 above the seat rail 14 so as to be openable and closable. An article storage chamber (not shown) in which a helmet or the like can be stored is provided below the seating seat 25. Therefore, by opening the seating sheet 25, it is possible to put in and out the article in the article storage chamber. The front portions of the vehicle body frame 11 and the power unit 19 are entirely covered with a synthetic resin frame cover 26 as a vehicle body cover to improve the appearance and protect internal devices.

  As shown in FIG. 2, the engine 21 is configured such that a cylinder assembly 28 extends from the front of a crankcase 27 so as to be inclined forward in a substantially horizontal direction. From the left side of the crankcase 27, the transmission device 22 is integrally provided and extends rearward. The cylinder assembly 28 includes a cylinder block 29, a cylinder head 30, and a head cover 31 that are sequentially stacked from the crankcase 27 side. The cylinder block 29 and the cylinder head 30 are covered with an engine cover 32 made of synthetic resin.

  In the engine cover 32, cooling air is introduced from the air guide port 35 by the rotation of the cooling fan 34 in the fan cover 33 (FIG. 3) attached to the crankshaft (not shown) of the engine 21, and the cylinder block 29 and the cylinder head 30 are forcibly cooled. The air duct 35 is opened to the right side of the fan cover 33. The cooling air that has cooled the cylinder block 29 and the cylinder head 30 is discharged from an exhaust port 36 (FIG. 4) formed on the lower surface of the engine cover 32.

  As shown in FIG. 2, an engine intake system having a fuel injection device (not shown), an air cleaner 37 (FIG. 1), and the like is disposed above the cylinder assembly 28 and the crankcase 27. This engine intake system supplies an air-fuel mixture (fuel / air mixture) to an intake port (not shown) of the cylinder head 30. This engine intake system is configured to be able to swing up and down around the pivot shaft 20 together with the power unit 19.

  An exhaust port (not shown) is opened on the lower surface of the cylinder head 30 shown in FIG. 2, and an exhaust pipe 38 is connected to the exhaust port. The exhaust pipe 38 extends rearward, and an exhaust muffler 39 is connected to the rear end thereof. The exhaust muffler 39 is fixed to the power unit 19 (crankcase 27) and is positioned on the right side of the rear wheel 23 (FIG. 1), and is protected from stepping stones and the like by the muffler cover 40 shown in FIGS. The exhaust pipe 38 and the exhaust muffler 39 constitute an engine exhaust system, and are configured to be able to swing up and down around the pivot shaft 20 together with the power unit 19.

In addition to the exhaust pipe 38 and the exhaust muffler 39, the engine exhaust system includes an exhaust gas sensor 41 that is attached to the exhaust pipe 38 and detects the state of exhaust gas (for example, oxygen concentration in the exhaust gas). For example, an O 2 sensor is used as the exhaust gas sensor 41. When the O 2 sensor detects the oxygen concentration in the exhaust gas, the fuel injection amount from the fuel injection device is increased or decreased according to the oxygen concentration, and an optimum air-fuel ratio is realized.

  As shown in FIGS. 2 to 4, the exhaust gas sensor 41 is mounted on the exhaust pipe 38 as described above. However, the exhaust gas sensor 41 is disposed in front of the crankcase 27 and directly below the cylinder block 29 and the cylinder head 30. It is arranged above the pivot shaft 20 that is supported so as to be swingable. Thus, the exhaust gas sensor 41 is surrounded by the engine 21 including the crankcase 27 and the cylinder assembly 28 (the cylinder block 29, the cylinder head 30 and the head cover 31), and the exhaust pipe 38 formed by bending as described later. The space 45 is accommodated.

  Further, the terminal portion 41A of the exhaust gas sensor 41 to which a sensor harness (not shown) is connected is provided so as to be inclined upward from the central axis of the exhaust pipe 38, for example, rearward and upward from the central axis of the exhaust pipe 38. It is done. As a result, the exhaust pipe 38 is positioned in front of and below the exhaust gas sensor 41.

  As shown in FIGS. 2 to 4, the exhaust pipe 38 has a vertical portion 43A extending right below from an exhaust port (not shown) of the cylinder head 30, and then bent to extend horizontally in the vehicle width direction rightward. A horizontal front portion 43B and a horizontal rear portion 43C bent thereafter and extending rearward along the vehicle front-rear direction are configured to be connected. The exhaust gas sensor 41 is mounted in the vicinity of the exhaust port of the cylinder head 30 on the downstream side of the bent portion 44 at the boundary between the vertical portion 43A and the horizontal front portion 43B in the exhaust pipe 38. Thereby, the sensor activation temperature of the exhaust gas sensor 41 is sufficiently secured by the heat of the exhaust gas discharged from the exhaust port.

  Furthermore, as shown in FIG. 4, the exhaust gas sensor 41 is provided such that the terminal portion 41 </ b> A is inclined in a direction away from the horizontal rear portion 43 </ b> C of the exhaust pipe 38 in the vehicle width direction. Further, the exhaust gas sensor 41 is disposed at a position shifted (offset) from directly below the air exhaust port 36 opened on the lower surface of the engine cover 32, and when the cooling air exhausted from the air exhaust port 36 hits the exhaust gas sensor 41. Is not configured.

  With the configuration as described above, the following effects (1) to (5) are achieved according to the present embodiment.

  (1) Since the exhaust gas sensor 41 is mounted on the exhaust pipe 38 immediately below the cylinder block 29 and the cylinder head 30 of the cylinder assembly 28 and in front of the crankcase 27 above the pivot shaft 20, the crankcase 27 and the cylinder assembly The exhaust gas sensor 41 can be accommodated in a space 45 surrounded by the engine 21 including the engine 28 and the exhaust pipe 38. For this reason, especially when the power unit 19 swings, it is possible to prevent interference between the exhaust gas sensor 41 and the vehicle body parts (the vehicle body frame 11, the frame cover 26, etc.).

  (2) Since the terminal portion 41A of the exhaust gas sensor 41 is disposed to be inclined rearward and upward relative to the central axis of the exhaust pipe 38, the exhaust pipe 38 is positioned in front of and below the exhaust gas sensor 41. . For this reason, the exhaust pipe 38 can protect the exhaust gas sensor 41 from a stepping stone during traveling of the vehicle.

  (3) Since the exhaust gas sensor 41 is disposed in the vicinity of the exhaust port in the exhaust pipe 38, the sensor activation temperature of the exhaust gas sensor 41 can be sufficiently secured by the heat of the exhaust gas discharged from the exhaust port. For this reason, a heater for heating the exhaust gas sensor 41 becomes unnecessary, and therefore the capacity of the generator for supplying power to the heater can be reduced. As a result, the engine 21 including this generator can be made compact and mechanical loss can be reduced.

  (4) The exhaust gas sensor 41 is provided such that the terminal portion 41A is inclined in a direction away from the horizontal rear portion 43C of the exhaust pipe 38 extending in the vehicle front-rear direction in the vehicle width direction. For this reason, since a sensor harness (not shown) connected to the terminal portion 41A of the exhaust gas sensor 41 can be disposed away from the horizontal rear portion 43C of the exhaust pipe 38, the sensor harness is affected by the heat of the exhaust pipe 38. Can be prevented.

  (5) Since the exhaust gas sensor 41 is disposed at a position shifted from the air exhaust port 36 formed on the lower surface of the engine cover 32, it is possible to prevent the cooling air exhausted from the air exhaust port 36 from hitting the exhaust gas sensor 41. As a result, it is possible to prevent the exhaust gas sensor 41 from being cooled by the cooling air to a temperature lower than the sensor activation temperature.

10 Scooter type motorcycle 11 Body frame 19 Power unit 20 Pivot shaft (support shaft)
21 Engine 28 Cylinder assembly 29 Cylinder block 30 Cylinder head 32 Engine cover 36 Air exhaust port 38 Exhaust pipe 41 Exhaust gas sensor 41A Exhaust gas sensor terminal 43C Horizontal rear part of exhaust pipe

Claims (4)

  1. A power unit in which an engine in which a cylinder assembly extends forwardly from a crankcase and a transmission device in which a rear wheel is pivotally supported at a rear part is integrally configured, and the power unit can swing up and down with respect to a vehicle body frame. A support shaft provided at the front lower side of the crankcase that is supported on the exhaust, an exhaust pipe connected to an exhaust port provided on a cylinder head of the cylinder assembly and extending rearward, and an exhaust gas sensor for detecting the state of the exhaust gas A motorcycle having
    The exhaust pipe includes a vertical portion extending directly below the exhaust port, a horizontal front portion bent thereafter and extending horizontally in one side in the vehicle width direction, and then bent rearward along the vehicle side portion. A horizontal rear part extending in the horizontal direction is connected and configured.
    The exhaust gas sensor is disposed immediately below the cylinder assembly in front of the crankcase , and is mounted on the rear surface of the horizontal front portion of the exhaust pipe in front of the support shaft that supports the power unit. An exhaust gas sensor mounting structure for a motorcycle, characterized in that is disposed to be inclined rearward and upward so as to approach the lower surface of the power unit .
  2. 2. The motorcycle according to claim 1, wherein the exhaust gas sensor is disposed immediately downstream of a bent portion at a boundary between a vertical portion and a horizontal front portion in the vicinity of an exhaust port of a horizontal front portion of the exhaust pipe. Exhaust gas sensor mounting structure.
  3. Terminal portion of the exhaust gas sensor mounted on said horizontal front portion, relative to the exhaust pipe of the horizontal rear portion that extends rearward along the vehicle one side in the vehicle bottom view, after the horizontal in the vehicle width direction The exhaust gas sensor mounting structure for a motorcycle according to claim 1, wherein the exhaust gas sensor mounting structure is provided so as to be inclined toward the other side of the vehicle that is separated from the portion .
  4. Claims wherein a portion of the cylinder assembly is covered with an engine cover is forcibly cooled by air, and wherein said that the exhaust gas sensor is disposed at a position shifted from just below the lower surface opening the exhaust air port of the engine cover Item 2. An exhaust gas sensor mounting structure for a motorcycle according to Item 1.
JP2010021102A 2010-02-02 2010-02-02 Exhaust gas sensor mounting structure for motorcycles Active JP5644124B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2010021102A JP5644124B2 (en) 2010-02-02 2010-02-02 Exhaust gas sensor mounting structure for motorcycles

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2010021102A JP5644124B2 (en) 2010-02-02 2010-02-02 Exhaust gas sensor mounting structure for motorcycles
PCT/JP2011/051230 WO2011096291A1 (en) 2010-02-02 2011-01-24 Structure for attaching exhaust gas sensor in motorcycle
CN201180008018.0A CN102844552B (en) 2010-02-02 2011-01-24 Structure for attaching exhaust gas sensor in motorcycle

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JP2011157891A JP2011157891A (en) 2011-08-18
JP5644124B2 true JP5644124B2 (en) 2014-12-24

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WO (1) WO2011096291A1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103437874A (en) * 2013-08-22 2013-12-11 江门市大长江集团有限公司 Oxygen sensor installation structure assembly of motorcycle engine
JP6208353B2 (en) * 2014-07-04 2017-10-04 ヤマハ発動機株式会社 Vehicle and single cylinder 4-stroke engine unit
JP6266549B2 (en) * 2015-02-25 2018-01-24 本田技研工業株式会社 Motorcycle exhaust system
EP3498996A4 (en) * 2016-08-10 2019-08-14 Honda Motor Co., Ltd. Exhaust structure for saddled vehicle
JP6687651B2 (en) * 2018-02-09 2020-04-28 本田技研工業株式会社 Saddle type vehicle
JP6639536B2 (en) * 2018-02-09 2020-02-05 本田技研工業株式会社 Saddle-type vehicle
JP6599492B2 (en) 2018-02-09 2019-10-30 本田技研工業株式会社 Saddle riding vehicle
JP2019190354A (en) 2018-04-24 2019-10-31 ヤマハ発動機株式会社 Scooter
WO2020111187A1 (en) * 2018-11-30 2020-06-04 本田技研工業株式会社 Saddle type vehicle

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4145423B2 (en) * 1999-05-28 2008-09-03 本田技研工業株式会社 Exhaust gas sensor device for motorcycles
JP4293916B2 (en) * 2004-01-19 2009-07-08 本田技研工業株式会社 Exhaust gas sensor mounting structure for internal combustion engine
JP4477481B2 (en) * 2004-12-20 2010-06-09 本田技研工業株式会社 Oxygen concentration sensor mounting structure
JP4555710B2 (en) * 2005-03-14 2010-10-06 本田技研工業株式会社 Motorcycle
JP2008063977A (en) * 2006-09-05 2008-03-21 Yamaha Motor Co Ltd Motorcycle
JP2010234949A (en) * 2009-03-31 2010-10-21 Keihin Corp Oxygen concentration sensor mounting structure

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CN102844552B (en) 2015-05-27
WO2011096291A1 (en) 2011-08-11
CN102844552A (en) 2012-12-26
JP2011157891A (en) 2011-08-18

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