JP5585213B2 - Exhaust gas passage structure of internal combustion engine - Google Patents

Exhaust gas passage structure of internal combustion engine Download PDF

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JP5585213B2
JP5585213B2 JP2010123273A JP2010123273A JP5585213B2 JP 5585213 B2 JP5585213 B2 JP 5585213B2 JP 2010123273 A JP2010123273 A JP 2010123273A JP 2010123273 A JP2010123273 A JP 2010123273A JP 5585213 B2 JP5585213 B2 JP 5585213B2
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exhaust gas
gas passage
exhaust
passage
engine
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JP2011247217A (en
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佳克 秋田
伸一 山田
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スズキ株式会社
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Description

  The present invention relates to an exhaust gas passage structure of an internal combustion engine that exhausts exhaust gas from an exhaust port of a cylinder head through an exhaust gas passage.

  Patent Document 1 discloses a motorcycle in which a straight pipe portion is provided in the vicinity of an exhaust port in an exhaust gas passage (exhaust pipe) of a motorcycle and an exhaust gas sensor is installed in the straight pipe portion.

JP 2006-170938 A

  However, in the exhaust gas passage (exhaust pipe) described in the above publication, the detection part of the exhaust gas sensor is provided so as to protrude into the exhaust pipe. However, in this case, especially in a small engine, the passage cross-sectional area of the exhaust pipe is small, and the passage cross-sectional area cannot be increased by changing the passage cross-sectional shape, so that the exhaust resistance increases.

  In addition, since the exhaust pipe is provided with a straight pipe portion for attaching the exhaust gas sensor in the vicinity of the exhaust port, the ground height of the exhaust pipe is lowered, the detachability of the exhaust pipe is reduced, and the exhaust pipe occupying the vehicle body This increases the space of the vehicle and hinders downsizing of the vehicle.

  Furthermore, when an exhaust gas sensor is attached to the straight pipe portion of the exhaust pipe via a sensor boss, a curved surface that conforms to the curved surface of the straight pipe portion must be applied to the joint surface of the sensor boss with the straight pipe portion by complicated processing. This has led to an increase in manufacturing costs.

  An object of the present invention is to provide an exhaust gas passage structure of an internal combustion engine that can increase the degree of freedom of the cross-sectional shape of the exhaust gas passage.

According to the present invention, there is provided a power unit in which an engine mainly including a cylinder assembly including a cylinder block, a cylinder head, and a head cover and a transmission device for driving a rear wheel are integrated with respect to a vehicle body frame. A pivot shaft is pivotally supported around a pivot shaft provided in the case, and exhaust gas from a combustion chamber in the cylinder head of the engine is passed through an exhaust gas passage from an exhaust port formed in the cylinder head. In the exhaust gas passage structure of an internal combustion engine that discharges via the exhaust gas passage, the exhaust gas passage includes a first exhaust gas passage connected to the exhaust port and a second exhaust gas passage connected to the first exhaust gas passage. The engine exhaust system and the engine exhaust system together with the power unit in front of the vehicle body frame. Can swing vertically around the pivot axis, the first exhaust gas passage has a bent portion that is bent substantially at a right angle is provided directly below the exhaust port of the cylinder head, the bent portion, wherein The exhaust gas passage composed of the first exhaust gas passage and the second exhaust gas passage is connected to the rear end thereof after the first exhaust gas passage extends vertically downward from the exhaust port of the cylinder head. An exhaust gas sensor extends in the horizontal direction through the exhaust gas passage and protrudes from the bent portion of the first exhaust gas passage , and the exhaust gas sensor is disposed in front of the crankcase in the cylinder. A crankcase and a cylinder arm directly below the block and the cylinder head and above the pivot shaft for swingably supporting the power unit. An engine comprising comprise assembly is accommodated in a space surrounded by an exhaust pipe constituting the first exhaust gas passage which is formed by bending, further, the first exhaust gas passage, its central axis A plurality of passage pieces divided by a surface extending along the surface are joined to each other.

  According to the present invention, the first exhaust gas passage is configured by joining a plurality of passage pieces divided by a surface extending along the central axis thereof, so that the passage cross-sectional shape can be formed in a non-circular shape, and It can be formed by changing the cross-sectional shape of the passage along the axial direction of one exhaust gas passage. As a result, the degree of freedom of the passage cross-sectional shape in the first exhaust gas passage can be expanded.

1 is a left side view showing a scooter type motorcycle to which an embodiment of an exhaust gas passage structure of an internal combustion engine according to the present invention is applied. The left view which shows the power unit of FIG. 1 with a part of engine exhaust system. The right view which shows the power unit of FIG. 1 with an engine exhaust system. IV arrow line view of FIG. The perspective view which shows the 1st exhaust pipe of FIGS. 2-4 with an exhaust gas sensor. Sectional drawing which follows the VI-VI line of FIG. Sectional drawing which follows the VII-VII line of FIG. Explanatory drawing which shows the conventional exhaust pipe with a sensor boss | hub.

  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 an exhaust gas passage structure of an internal combustion engine 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 a down tube 13 extends downward from a rear portion of a head pipe 12 at the frontal portion, and a seat rail 14 extends obliquely upward and rearward from a lower portion of the down tube 13. .

  A front fork 15 is supported on the head pipe 12 so as to be rotatable left and right together with the handle bar 16, and a front wheel 17 is pivotally supported at the tip of the front fork 15. On the other hand, a power unit 19 is pivotally supported at the center of the lower part of the down tube 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. An engine 21 as an internal combustion engine and a transmission device 22 are integrally formed, and a rear wheel 23 is directly supported by a 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 39 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 39 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 with respect to the vehicle body frame 11 via the swing bracket 18 so as to swing up and down around the pivot shaft 20 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 portion of the power unit 19 and the vehicle body frame 11 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, the cylinder head 30 and the like are forcibly cooled. The air duct 35 is opened to the right side of the fan cover 33. Cooling air that has cooled the cylinder block 29, the cylinder head 30, and the like 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 38 having a fuel injection device (or carburetor) and an air cleaner 37 (FIG. 1) (not shown) is disposed above the cylinder assembly 28 and the crankcase 27. The engine intake system 38 supplies an air-fuel mixture (fuel / air mixture) to an intake port (not shown) of the cylinder head 30. The engine intake system 38 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 40 as an exhaust gas passage is connected to the exhaust port. The exhaust pipe 40 extends rearward, and an exhaust muffler 41 is integrally connected to the rear end thereof. The exhaust muffler 41 is fixed to the power unit 19 (crankcase 27) and is located on the right side of the rear wheel 23 (FIG. 1), and is protected from flying stones and the like by the muffler cover 42 shown in FIGS.

  The exhaust pipe 40 and the exhaust muffler 41 constitute an engine exhaust system 43 as an exhaust gas passage structure. Exhaust gas from a combustion chamber (not shown) in the cylinder head 30 is discharged from the exhaust port through the engine exhaust system 43 (exhaust pipe 40 and exhaust muffler 41). The engine exhaust system 43 is configured to be swingable in the vertical direction around the pivot shaft 20 together with the power unit 19.

An exhaust gas sensor 44 that detects the state of exhaust gas (for example, oxygen concentration in the exhaust gas) is attached to the exhaust pipe 40 in the engine exhaust system 43. For example, an O 2 sensor is used as the exhaust gas sensor 44. When the O 2 sensor detects the oxygen concentration in the exhaust gas, the amount of fuel supplied from the fuel injection device or the carburetor is increased or decreased in accordance with the oxygen concentration, thereby realizing an optimum air-fuel ratio.

  As shown in FIGS. 2 to 4, the exhaust gas sensor 44 is mounted on the exhaust pipe 40 as described above, but 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 44 is accommodated in a space 45 surrounded by the engine 21 including the crankcase 27 and the cylinder assembly 28 and the exhaust pipe 40 formed by bending as described later.

  As shown in FIGS. 2 to 4, the exhaust pipe 40 includes a first exhaust pipe 46 as a first exhaust gas passage connected to an exhaust port (not shown) of the cylinder head 30, and the first exhaust pipe 46. The exhaust muffler 41 is connected to the second exhaust pipe 47. The second exhaust pipe 47 is connected to the second exhaust pipe 47 as a second exhaust gas passage. The first exhaust pipe 46 includes a bent portion 48 that bends at substantially right angles. By the bent portion 48, the exhaust pipe 40 extends vertically downward from the exhaust port of the cylinder head 30, and then extends rearward in the horizontal direction.

  The bent portion 48 of the first exhaust pipe 46 is provided immediately below the exhaust port of the cylinder head 30, and the exhaust gas sensor 44 projects from the bent portion 48 (more precisely, immediately downstream of the bent portion 48). . As a result, the exhaust gas sensor 44 is disposed in the vicinity of the exhaust port of the cylinder head 30 and is exposed to the exhaust gas in a high temperature state. Therefore, the sensor activation temperature of the exhaust gas sensor 44 is sufficiently secured by the heat of the exhaust gas discharged from the exhaust port.

  Incidentally, as shown in FIGS. 5 and 6, the first exhaust pipe 46 is not formed by bending a straight pipe, but a surface extending along the central axis P of the first exhaust pipe 46, Preferably, a plurality of (for example, two) passage pieces 46A and 46B including a central axis P of the first exhaust pipe 46 and divided along a plane S extending along the central axis P are joined to form a so-called middle structure ( (Hollow structure). Each of these passage pieces 46 </ b> A and 46 </ b> B is formed, for example, by press-molding a metal plate, and is formed in a bent state in order to form a bent portion 48. Here, the central axis P of the first exhaust pipe 46 is an axis passing through the center O of the passage cross section of the first exhaust pipe 46.

  Further, as shown in FIGS. 5 and 7, one of the passage pieces 46 </ b> A and 46 </ b> B (for example, the passage piece 46 </ b> A) is formed with a flat portion 51 to which the sensor boss 50 for attaching the exhaust gas sensor 44 can be attached. A sensor mounting hole 52 is formed in the flat portion 51 simultaneously with the flat portion 51. The sensor boss 50 is flattened on the joining surface 54 by, for example, a lathe, and the joining surface 54 of the sensor boss 50 is fixed to the planar portion 51 of the passage piece 46A by welding or the like. Thus, the exhaust gas sensor 44 can be installed in the bent portion 48 of the first exhaust pipe 46 using the sensor boss 50 fixed to the flat portion 51 of the passage piece 46A.

  Further, in the first exhaust pipe 46, as shown in FIG. 7, a detection portion 53 of the exhaust gas sensor 44 is installed so as to protrude through the sensor mounting hole 52. In the first exhaust pipe 46, the passage cross-sectional area (the hatched α portion in FIG. 7) of the portion where the detection unit 53 of the exhaust gas sensor 44 protrudes is the upstream or downstream vicinity portion of the installation portion of the exhaust gas sensor 44. Is equal to or greater than the passage cross-sectional area (for example, the hatched β portion in FIG. 6). For example, the peripheral edge portion of the flat surface portion 51 in the passage piece 46 </ b> A is formed to bulge outward at least by a volume corresponding to the volume of the detection portion 53 of the exhaust gas sensor 44.

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

  (1) The first exhaust pipe 46 of the exhaust pipe 40 has a middle structure in which two passage pieces 46A and 46B including the central axis P and divided by a surface S extending along the central axis P are joined. It is configured. For this reason, the first exhaust pipe 46 can be formed in a non-circular cross-sectional shape by, for example, press molding, and can be formed by changing the cross-sectional shape of the passage along the direction of the central axis P of the first exhaust pipe 46. The degree of freedom of the passage cross-sectional shape in one exhaust pipe 46 can be expanded.

  Therefore, even when the detection part 53 of the exhaust gas sensor 44 is installed so as to protrude into the first exhaust pipe 46, the portion of the first exhaust pipe 46 where the detection part 53 of the exhaust gas sensor 44 protrudes and the passage disconnection in the vicinity thereof. The area can be formed equal to or greater than the passage cross-sectional area of other portions. As a result, it is possible to prevent a reduction in the passage sectional area of the first exhaust pipe 46 caused by the detection portion 53 of the exhaust gas sensor 44 projecting into the first exhaust pipe 46, and to reduce the exhaust resistance.

  (2) The exhaust gas sensor 44 is installed in a bent portion 48 near the exhaust port of the cylinder head 30 in the first exhaust pipe 46 of the exhaust pipe 40. For this reason, since the exhaust gas in a high temperature state can be applied to the exhaust gas sensor 44, the exhaust gas sensor 44 can be maintained in the activation temperature region.

  (3) The exhaust gas sensor 44 is installed in the bent portion 48 of the first exhaust pipe 46 of the exhaust pipe 40. Accordingly, since it is not necessary to form a straight pipe portion for attaching the exhaust gas sensor 44 in the vicinity of the exhaust port of the cylinder head 30 in the exhaust pipe 40, the ground height H (FIG. 2) of the exhaust pipe 40 can be sufficiently secured. As a result, it is possible to improve the workability when the engine exhaust system 43 (the exhaust pipe 40 and the exhaust muffler 41) is attached and detached, and to realize a compact size around the power unit 19 and thus the scooter type motorcycle 10.

  (4) As shown in FIG. 8, when an exhaust gas sensor (not shown) is attached to a tubular exhaust pipe 100 by pipe molding via a sensor boss 101, the weldability of the sensor boss 101 to the exhaust pipe 100 and sensor position accuracy. In order to ensure, the joint surface 102 of the sensor boss 101 to the exhaust pipe 100 must be processed into a curved surface shape by, for example, milling so as to conform to the curved surface shape of the exhaust pipe 100, which is difficult to manufacture. Accompanied by.

  On the other hand, in the exhaust pipe 40 of the present embodiment shown in FIGS. 5 and 7, since the flat portion 51 is formed on, for example, the passage piece 46 </ b> A of the first exhaust pipe 46, the sensor boss 50 has the joining surface 54. For example, it is sufficient to process the surface with a lathe or the like, and the sensor mounting hole 52 can be formed when the passage piece 46A is formed. Therefore, since the processing of the sensor boss 50 and the sensor mounting hole 52 can be easily performed with high accuracy, the mounting accuracy of the exhaust gas sensor 44 can be improved and the cost can be reduced.

  (5) When a bent portion is formed by bending a tubular exhaust pipe formed by pipe molding, there are manufacturing restrictions such as that the radius of curvature cannot be reduced. On the other hand, in the exhaust pipe 40 of the present embodiment, the first exhaust pipe 46 is configured in the middle structure by joining the press-formed passage piece 46A and the passage piece 46B. There are no manufacturing restrictions such as restrictions. Therefore, the design freedom of the exhaust pipe 40 can be improved.

  As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to this.

  For example, the surface that divides the first exhaust pipe 46 into the passage pieces 46 </ b> A and 46 </ b> B is not limited to the surface S that includes the central axis P of the first exhaust pipe 46 and extends along the central axis P, but the first exhaust pipe 46. A plane (not including the central axis P) extending parallel to the central axis P along the central axis P may be used.

  Further, the passage pieces 46A and 46B in the first exhaust pipe 46 of the exhaust pipe 40 may be formed by casting. In this case, the sensor boss 50 can be integrally formed with the passage piece 46A, for example, by casting.

  Further, the engine exhaust system 43 shown in FIG. 3 has been described in which the second exhaust pipe 47 of the exhaust pipe 40 and the exhaust muffler 41 are integrated. However, the second exhaust pipe 47 and the exhaust muffler 41 are divided. It may be of a possible structure.

21 Engine (Internal combustion engine)
30 Cylinder head 40 Exhaust pipe (exhaust gas passage)
43 engine exhaust system 44 exhaust gas sensor 46 first exhaust pipe (first exhaust gas passage)
46A, 46B Passage piece 48 Bent part 50 of first exhaust pipe Sensor boss 51 Plane part P Central axis S surface of first exhaust pipe

Claims (4)

  1. A power unit in which an engine mainly including a cylinder assembly including a cylinder block, a cylinder head, and a head cover and a transmission device for driving a rear wheel is provided in a crankcase of the engine with respect to a vehicle body frame. An internal combustion engine that is pivotally supported so as to be swingable in the vertical direction around a pivot shaft and exhausts exhaust gas from a combustion chamber in the cylinder head of the engine from an exhaust port formed in the cylinder head through an exhaust gas passage. In the engine exhaust gas passage structure,
    The exhaust gas passage includes a first exhaust gas passage connected to the exhaust port and a second exhaust gas passage connected to the first exhaust gas passage, and constitutes an engine exhaust system. The system is configured to be swingable in the vertical direction around the pivot axis with respect to the body frame together with the power unit,
    The first exhaust gas passage includes a bent portion that is provided directly below the exhaust port of the cylinder head and bends at a substantially right angle. The bent portion allows the first exhaust gas passage to be separated from the first exhaust gas passage and the second exhaust gas passage. The exhaust gas passage comprises a first exhaust gas passage extending vertically downward from an exhaust port of the cylinder head and then extending rearward in the horizontal direction through the second exhaust gas passage connected to the rear end thereof. While
    An exhaust gas sensor protrudes from the bent portion of the first exhaust gas passage , and the exhaust gas sensor is directly under the cylinder block and the cylinder head in front of the crankcase and can swing the power unit. The engine is provided in a space surrounded by an engine including a crankcase and a cylinder assembly above the pivot shaft to be supported, and an exhaust pipe constituting the first exhaust gas passage formed by bending,
    The exhaust gas passage structure of an internal combustion engine, wherein the first exhaust gas passage is constituted by joining a plurality of passage pieces divided by a surface extending along a central axis thereof.
  2. One of the plurality of passage pieces forming the first exhaust gas passage is provided with a flat portion on which a sensor boss for attaching the exhaust gas sensor can be mounted and a sensor mounting hole formed on the flat portion. The exhaust gas passage structure for an internal combustion engine according to claim 1.
  3. The exhaust gas passage for an internal combustion engine according to claim 2, wherein a joint surface that is flattened to be attached to the flat portion formed on one of the passage pieces is formed on the sensor boss for mounting the exhaust gas sensor. Construction.
  4. In the first exhaust gas passage, the claims detector of the exhaust gas sensor is cross-sectional area of the portion that is disposed to protrude therein, characterized in that it is configured to equal to or more than the passage sectional area of the other portion 2. An exhaust gas passage structure for an internal combustion engine according to 1 .
JP2010123273A 2010-05-28 2010-05-28 Exhaust gas passage structure of internal combustion engine Active JP5585213B2 (en)

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KR101394037B1 (en) * 2012-08-28 2014-05-09 기아자동차 주식회사 Exhaust gas exhaust system

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JPS5292115U (en) * 1976-01-06 1977-07-09
JPS615317U (en) * 1984-06-18 1986-01-13
JPH021410U (en) * 1988-06-14 1990-01-08
JPH0544499Y2 (en) * 1988-09-08 1993-11-11
JP4145423B2 (en) * 1999-05-28 2008-09-03 本田技研工業株式会社 Exhaust gas sensor device for motorcycles
JP3791419B2 (en) * 2002-01-17 2006-06-28 日産自動車株式会社 Exhaust device 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
JP2009144693A (en) * 2007-12-17 2009-07-02 Sango Co Ltd Boss for mounting sensor

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