WO2023189962A1

WO2023189962A1 - Saddle riding-type vehicle

Info

Publication number: WO2023189962A1
Application number: PCT/JP2023/011294
Authority: WO
Inventors: 貴裕佐野; 誠太郎亀井; 泰樹坂根; 亮輔木下; 万丈菅野
Original assignee: 本田技研工業株式会社
Priority date: 2022-03-30
Filing date: 2023-03-22
Publication date: 2023-10-05

Abstract

The present disclosure provides an effective configuration for preliminary warmup or sensor temperature maintenance of an exhaust gas sensor in an internal combustion engine mounted in a saddle riding-type vehicle. The saddle riding-type vehicle 10 in one embodiment comprising an exhaust system 39 extending rearward below an engine body 26 of an internal combustion engine E and a brake pedal 24. The exhaust system 39 has a pipe portion 50p provided so as to extend along the brake pedal 24 in the front-rear direction of the vehicle, and at least a portion of the exhaust gas sensor 46 provided in the pipe portion 50p is located inside the brake pedal 24 in the width direction of the vehicle and is covered by the brake pedal 24.

Description

saddle type vehicle

The present invention relates to a straddle-type vehicle such as a motorcycle equipped with an internal combustion engine.

From the perspective of environmental conservation, there is a need for even cleaner exhaust gas from internal combustion engines. In order to make exhaust gas cleaner, it is possible to arrange an exhaust purification catalyst in the exhaust passage of an internal combustion engine and provide an exhaust gas sensor such as an oxygen sensor or an air-fuel ratio sensor on the upstream and downstream sides, or only on the upstream side. It is being said. For example, fuel injection control of an internal combustion engine is performed so that an upstream exhaust gas sensor is used to control the air-fuel ratio of exhaust gas flowing into the catalyst, and a downstream exhaust gas sensor is used to maximize the purification efficiency of the catalyst. etc. are controlled.

Conventionally, catalysts and exhaust gas sensors have also been used in motorcycles. For example, an internal combustion engine mounted on a motorcycle in Patent Document 1 has an exhaust pipe that curves from the front of the cylinder head, extends diagonally backward and downward, and passes in front of the cylinder and engine case. . This exhaust pipe is curved in front of the engine case and directed rearward, passes under the engine case and extends rearward, and is connected to the muffler behind the rear end of the brake pedal. The muffler is provided with an exhaust gas sensor and a catalyst device in order from the upstream side. The catalyst device includes a catalyst therein for purifying exhaust gas. This allows the exhaust gas sensor to be mounted inconspicuously.

Japanese Patent Application Publication No. 2016-000978

By the way, in the motorcycle of Patent Document 1, since the exhaust gas sensor is provided in the muffler, the position of the exhaust gas sensor is far from the combustion chamber. Therefore, it is difficult to quickly warm up the exhaust gas sensor or maintain the sensor temperature using the heat of the exhaust gas. have challenges. SUMMARY OF THE INVENTION An object of the present invention is to provide a configuration that is effective for early warming up of an exhaust gas sensor of an internal combustion engine mounted on a straddle-type vehicle, such as a motorcycle, or for maintaining the temperature of the sensor.

In order to achieve the above object, one aspect of the present invention is to
A straddle-type vehicle equipped with an internal combustion engine,
an exhaust device extending rearward through a lower part of the engine body of the internal combustion engine;
Equipped with a brake pedal,
The exhaust device has a pipe portion that is provided to extend in the longitudinal direction of the vehicle along the brake pedal,
To provide a straddle-type vehicle, wherein at least a part of the exhaust gas sensor provided on the pipe portion is located inside the brake pedal in the vehicle width direction and is covered by the brake pedal.

According to the above configuration, by covering at least a portion of the exhaust gas sensor with the brake pedal, it is possible to improve the protection performance of the exhaust gas sensor and make the exhaust gas sensor less noticeable. Then, the exhaust gas sensor, particularly the sensor body thereof, can be placed near the engine body of the internal combustion engine. Therefore, it is possible to warm up the exhaust gas sensor using exhaust heat such as exhaust gas from the engine body, and therefore, compared to the arrangement of Patent Document 1, it is possible to warm up the exhaust gas sensor earlier or maintain the sensor temperature more effectively. It becomes possible to do so.

Preferably, the exhaust device includes a purification device having an exhaust gas purification catalyst therein upstream of the exhaust gas sensor, and at least a part of the exhaust gas sensor is hidden behind the purification device. According to the above configuration, since at least a portion of the exhaust gas sensor is hidden behind the purification device, the exhaust gas sensor can be protected from obstacles such as stones flying from the front of the vehicle. Furthermore, this prevents the wind from directly hitting the exhaust gas sensor, thereby preventing the temperature of the exhaust gas sensor from decreasing.

Preferably, the purification device is located further forward of the vehicle than the front end of the brake pedal.
According to this configuration, it becomes possible to arrange the purifying device more freely in the vehicle width direction.

Preferably, the purification device is located on the front side of the engine main body in the longitudinal direction of the vehicle, and the exhaust gas sensor is located on the rear side of the rotation axis of the crankshaft of the engine main body. According to this configuration, it is possible to ensure a longer distance from the downstream end of the purification device to the exhaust gas sensor. Therefore, it is possible to maintain a smooth flow of the exhaust gas immediately after passing through the catalyst of the purification device, improve drivability, and further improve the detection accuracy of exhaust gas components by the exhaust gas sensor.

Preferably, the straddle-type vehicle further includes a kick pedal, and the exhaust gas sensor is disposed behind the kick pedal. According to this configuration, by placing the exhaust gas sensor behind the kick pedal, the driver's foot is prevented from hitting the exhaust gas sensor when operating the kick pedal, compared to a case where the exhaust gas sensor is placed in front of the kick pedal. be able to.

Preferably, the pipe portion further includes a protection member that protects the exhaust gas sensor. According to this configuration, the exhaust gas sensor can be more securely protected using a dedicated protection member.

According to the above-mentioned aspect of the present invention, since the above-mentioned configuration is provided, it is possible to effectively warm up the exhaust gas sensor of the internal combustion engine mounted thereon or maintain the sensor temperature in a straddle-type vehicle.

FIG. 1 is a left side view of a motorcycle, which is a straddle-type vehicle, according to an embodiment of the present invention. FIG. 2 is a front view of the motorcycle shown in FIG. 1 with a part of the body cover omitted. FIG. 3 is a partially enlarged side view of the motorcycle 10 shown in FIG. 1. As shown in FIG. FIG. 4 is a partially enlarged side view of the motorcycle 10 in FIG. 1. FIG. FIG. 5 is a left side view of a portion of a modification of the motorcycle shown in FIG. 1. FIG. FIG. 6A is a perspective view of a tube section with a protection member. FIG. 6B is a perspective view showing the portion shown in FIG. 6A with a brake pedal further superimposed thereon. FIG. 7A is a perspective view of a tube section with another protection member. FIG. 7B is a perspective view showing a brake pedal further superimposed on the portion shown in FIG. 7A.

Hereinafter, a motorcycle 10, which is a straddle-type vehicle according to an embodiment of the present invention, will be described with reference to the accompanying drawings. Here, the up, down, front, back, left, and right directions of the vehicle body are defined based on the line of sight of the driver riding the motorcycle 10. In the figure, the upper side in the vertical direction is marked with the code "UP", the lower side with the code "DW", the front side in the longitudinal direction of the vehicle with the code "FR", and the rear side with the code "RR". The symbol "RH" is used for the right side in the vehicle width direction, and the symbol "LH" is used for the left side.

FIG. 1 shows a left side view of the motorcycle 10, that is, a right side view. FIG. 2 shows a front view of the motorcycle 10 with a part of the body cover omitted, that is, a front view. 3 and 4 are partially enlarged side views of the motorcycle 10 shown in FIG. 1. Note that FIG. 4 is a further enlarged view of the portion shown in FIG. 3.

The motorcycle 10 includes a body frame 12 on which a power unit and electrical components are mounted. The main tube of the vehicle body frame 12 extends rearward from a head pipe 14 located at the front end. The down tube 16 of the vehicle body frame 12 is provided so as to extend rearward and diagonally downward from the head pipe 14. A fuel tank 18 containing fuel is arranged behind the head pipe 14. A seat 20 on which a driver sits is mounted behind the fuel tank 18. A footrest 22 is provided below the seat 20 for resting the driver's feet during driving.

A brake pedal 24 for the rear wheel WR, which is a driving wheel, is provided near the footrest 22 on the right side of the vehicle body shown in FIG. The brake pedal 24 has a rear end 24r located behind the footrest 22 that is pivotally supported, and a front end 24f located ahead of the footrest 22 that is swingable up and down. In a side view of the motorcycle 10 in FIG. 1, the brake pedal 24 initially slopes slightly downward and forward as it goes from the rear end 24r to the front end 24f, then becomes generally horizontal, and then... It is shaped to be slightly inclined toward the front and upward, and has a roughly U-shape. In other words, the brake pedal 24 extends in the front-rear direction without being inclined in the up-down direction when the motorcycle 0 is viewed from the side. The front end portion 24f of the brake pedal 24 functions as a pedal portion, and is located on the right side of the front end side portion of the crankcase 30, which will be described later. It can be operated by pressing the driver's foot.

Furthermore, a kick pedal 25 is provided near the footrest 22 on the right side of the vehicle body shown in FIG. 1, particularly above the footrest 22. The kick pedal 25 has a rear end 25r located diagonally rearward and upper side of the footrest 22, and a front end 25f located near the rear of the cylinder head 34 of the engine body 26 of the internal combustion engine E of the power unit. The kick pedal 25 first extends upward and curves forward as it goes from the rear end 25r to the front end 25f. When in use, the kick pedal 25 is deployed so as to extend outward in the vehicle width direction. The front end portion 25f of the kick pedal 25 functions as a pedal portion and is depressed by the driver's foot. By this depression, the kick pedal 25 rotates within a predetermined range around the rear end portion 25r, so that the internal combustion engine E can be started.

An engine body 26 of an internal combustion engine E is suspended between the main tube and down tube 16 of the vehicle body frame 12. The engine body 26 includes a crankcase 30 supported by the down tube 16 via a bracket 28, and a cylinder block 32, a cylinder head 34, and a head cover 36, which are provided in this order above the crankcase 30. A cylinder block 32 is connected above the crankcase 30 in a forward-inclined state. Therefore, as shown in FIG. 1, the cylinder axis C of the cylinder of the engine body 26 is inclined diagonally forward from the crankshaft side of the crankcase 30 toward the cylinder head 34 side. Note that the crankshaft extends in the vehicle width direction and is generally perpendicular to the vertical and longitudinal directions. In FIGS. 1, 3 and 4, the rotational axis 38 of the crankshaft is shown.

The upper end (upstream end) side of an exhaust pipe 40 of the exhaust system 39 is connected to the cylinder head 34 of the engine body 26 . Exhaust gas discharged from a combustion chamber (not shown) flows through an exhaust pipe 40 and is discharged from a muffler 42 located on the right side of the rear wheel WR, that is, located on the right rear side of the vehicle body.

Exhaust gas sensors

44 and 46 and a purification device 48 are provided on the front end side, that is, on the upstream side, of the muffler 42. Note that the exhaust port of the cylinder head 34, the exhaust pipe 40, the purifier 48, the exhaust pipe 50, and the muffler 42 are connected in this order in the exhaust flow direction, and each define a part of the exhaust passage 52.

Note that a front fork 54 is rotatably supported at the front end of the main tube via a steering shaft provided in the head pipe 14. A handlebar 56 is provided at the upper end of the steering shaft, and grips 58 are attached to both ends of the handlebar 56. A front wheel WF is rotatably supported at the lower part of the front fork 54. The upper part of the front wheel WF is partially covered by a front fender 60.

Further, at the rear of the engine body 26, a rear wheel WR to which the power of the internal combustion engine E is transmitted is rotatably supported via a swing arm. A suspension 62 is arranged between the swing arm and the vehicle body frame 12 to reduce shocks from the road surface. A rear fender 64 is arranged on the rear upper side of the rear wheel WR and behind the seat 20.

Now, as mentioned above, the exhaust pipe 40 of the exhaust system 39 is connected to the front wall of the cylinder head 34 of the engine body 26, and the purification system 48 and the muffler 42 are arranged in order from the upstream side downstream of the exhaust pipe 40. ing. The purifying device 48 is configured to have a function of purifying exhaust gas, and specifically houses or supports an exhaust gas purifying catalyst 48a therein. An exhaust gas sensor 44 is provided in the exhaust passage upstream of the purification device 48, and an exhaust gas sensor 46 is provided in the exhaust passage downstream of the purification device 48. Although each of the

exhaust gas sensors

44 and 46 is an oxygen sensor here, it may be an air/fuel ratio (A/F) sensor, for example. The muffler 42 is configured to have a silencing function.

As shown in FIGS. 1 and 2, the exhaust passage 52 that continues from the exhaust port of the cylinder head 34 of the engine body 26 extends to the front side of the engine body 26, then extends downward, and further extends to the front side of the engine body 26. Extends backwards through the bottom. In other words, the exhaust device 39 extends from the front side of the engine body 26 of the internal combustion engine E to below the engine body 26, passes below the engine body 26, and extends rearward. The purifying device 48 is positioned in front of the engine body 26 in the longitudinal direction of the vehicle, and particularly in the front of the crankcase 30. Therefore, this purifying device 48 is located further forward of the vehicle than the front end portion 24f of the brake pedal 24. Here, since the exhaust passage 52 extends around the engine body 26 as described above, the purification device 48 extends obliquely in the same way as the cylinder axis C in a side view of the motorcycle 10, and extends from the upstream side to the downstream side. It is arranged to extend diagonally backward and downward. As shown in the front view of the motorcycle 10 in FIG. 2, the purification device 48 is located on the right side of the central imaginary plane IS (a line extending vertically in the front wheel WF) extending from the front to the rear of the motorcycle 10. , here, is provided in the motorcycle 10 so that it extends to the right side of the front wheel WF, and its downstream portion is slightly inside in the vehicle width direction than its upstream portion. Note that the central imaginary plane IS can be determined to be perpendicular to the vehicle width direction and to substantially bisect the front wheel WF and the rear wheel WR.

An exhaust pipe 50 extending rearward from the purifier 48 extends below the crankcase 30 of the engine body 26. In the side view of FIGS. 1, 3, and 4, the exhaust pipe 50 has a pipe portion 50p that is provided to extend in the longitudinal direction of the vehicle along the brake pedal 24. The pipe portion 50p is located inside the intermediate portion 24m that extends generally straight in the front-rear direction between the front end portion 24f and the rear end portion 24r of the brake pedal 24, and is generally similar to the intermediate portion 24m in FIGS. 1, 3, and 4. They are parallel to each other, and partially overlap each other in the height direction, that is, in both the vertical direction and the longitudinal direction of the vehicle, in a considerable portion between the front end portion 24f and the rear end portion 24r, including the area before and after the intermediate portion 24m. The pipe portion 50p is located slightly below the middle portion 24m of the brake pedal 24.

The aforementioned exhaust gas sensor (hereinafter referred to as downstream exhaust gas sensor) 46 provided in the exhaust passage on the downstream side of the purifier 48 is provided in this pipe portion 50p here. Here, as shown in FIG. 1, FIG. 3, and FIG. hidden in That is, at least a portion of the downstream exhaust gas sensor 46 provided on the pipe portion 50p is located inside the brake pedal 24 in the vehicle width direction and is covered by the brake pedal 24. It should be noted that, as is clear from the above description and as shown in FIGS. 1 and 3, the downstream exhaust gas sensor 46 is disposed at the rear of the rotation axis 38 of the crankshaft. In this embodiment, the downstream exhaust gas sensor 46 is arranged behind the kick pedal 25 in the vehicle longitudinal direction. Furthermore, the downstream exhaust gas sensor 46 is provided so that at least a portion thereof is hidden behind the purifier 48. As shown in the front view of the motorcycle 10 in FIG. 2, a portion of the downstream exhaust gas sensor 46 is hidden behind the purifier 48.

Here, the above-mentioned exhaust gas sensor (hereinafter referred to as upstream exhaust gas sensor) 44 provided in the exhaust passage on the upstream side of the purifier 48 is attached to the cylinder head 34, and the exhaust gas The oxygen concentration of the port exhaust gas can be detected. However, the upstream exhaust gas sensor 44 is not limited to being provided so as to face the exhaust port, but may be provided at any position between the position of the exhaust port and the upstream end of the purification device 48 that internally supports the exhaust purification catalyst 48a. It can be provided at any location.

Although not shown, a control device for the internal combustion engine E, that is, an ECU (engine control unit) is mounted on the motorcycle 10 and has a computer configuration. That is, the ECU includes a processor (eg, CPU) and memory (eg, ROM, RAM).
Output signals from various sensors are input to the ECU. For example, in addition to engine load sensors such as an engine rotation speed sensor and a throttle opening sensor, the above-mentioned upstream exhaust gas sensor 44 and downstream exhaust gas sensor 46 are connected to the ECU. The ECU analyzes the operating state based on inputs from these sensors, and controls the operation of, for example, a fuel injection valve, a spark plug, and a throttle valve (not shown), respectively, based on the analyzed operating state. However, the throttle valve is not limited to being electronically controlled, and may have a mechanically operated configuration.

The characteristic configuration of the motorcycle 10 having the above configuration, and the operations and effects thereof will be described below.

The motorcycle 10, which is a straddle-type vehicle equipped with an internal combustion engine E, includes an exhaust device 39 that extends rearward through the lower part of the engine body 26 of the internal combustion engine E, and a brake pedal 24. The exhaust device 39 has a pipe portion 50p that is provided to extend in the longitudinal direction of the vehicle along the brake pedal 24. A downstream exhaust gas sensor 46 is provided on the pipe portion 50p. At least a portion of this downstream exhaust gas sensor 46 is located inside the brake pedal 24 in the vehicle width direction and is covered by the brake pedal 24. According to this configuration, by covering at least a portion of the downstream exhaust gas sensor 46 with the brake pedal 24, it is possible to improve the protection performance of the downstream exhaust gas sensor 46 and make the downstream exhaust gas sensor 46 less noticeable. The downstream exhaust gas sensor 46, particularly its sensor body, can be placed near the engine body 26 of the internal combustion engine E. Therefore, it becomes possible to warm the downstream exhaust gas sensor 46 using exhaust heat such as exhaust gas from the engine body 26. Therefore, this configuration makes it possible to warm up the downstream exhaust gas sensor 46 earlier or maintain the sensor temperature more effectively than the arrangement of Patent Document 1.

Further, as shown in the front view of FIG. 2, the exhaust device 39 includes a purification device 48 having an exhaust purification catalyst 48a therein on the upstream side of the downstream exhaust gas sensor 46, and at least part of the downstream exhaust gas sensor 48. is hidden behind the purifier 48. According to this configuration, at least a portion of the downstream exhaust gas sensor 46 is hidden behind the purification device 48, so that the downstream exhaust gas sensor 46 is protected from obstacles such as stones flying from the front of the vehicle due to the front wheel WF flipping up. 46 can be protected. Moreover, this can prevent the traveling wind from directly hitting the downstream exhaust gas sensor 46, and thus prevent the temperature of the downstream exhaust gas sensor 46 from decreasing.

Further, an upstream exhaust gas sensor 44 provided in the exhaust passage upstream of the purifier 48 is attached to the cylinder head 34. Therefore, it becomes possible to warm up the upstream exhaust gas sensor 44 more suitably using exhaust heat of exhaust gas and the like from the engine body 26.

Further, the purifying device 48 is located further forward of the vehicle than the front end portion 24f of the brake pedal 24. According to this configuration, it becomes possible to arrange the purifying device 48 more freely in the vehicle width direction.

In the longitudinal direction of the vehicle, the purification device 48 is located in front of the engine body 26, and the downstream exhaust gas sensor 46 is located behind the rotation axis 38 of the crankshaft of the engine body 26. According to this configuration, a longer distance from the downstream end of the purifier 48 to the downstream exhaust gas sensor 46 can be ensured. Therefore, the flow of exhaust gas immediately after passing through the exhaust purification catalyst 48a of the purification device 48 in the exhaust passage 52 can be maintained smoothly, and drivability can be improved. Detection accuracy can be further improved.

Further, the downstream exhaust gas sensor 46 is arranged behind the kick pedal 25. According to this configuration, by arranging the exhaust gas sensor 46 behind the kick pedal 25, the driver's foot is placed on the downstream side when operating the kick pedal 25, compared to the case where the exhaust gas sensor 46 is arranged on the front side of the kick pedal 25. It is possible to prevent the exhaust gas from hitting the exhaust gas sensor 46.

Note that the downstream exhaust gas sensor 46 is not limited to being disposed at the above location.
For example, as shown in a side view of a portion of the modified motorcycle in FIG. However, it may be positioned forward of the rear end portion 25r of the kick pedal 25. This can be arbitrarily determined, for example, taking into consideration the frequency of use of the kick pedal 25 in a motorcycle.

Furthermore, the pipe portion 50p of the exhaust pipe 50 extending rearward from the purifier 48 can further include a protection member that protects the downstream exhaust gas sensor 46. FIGS. 6A and 6B show a protective member 70 made by bending a plate-like member provided on the pipe portion 50p. FIG. 6A is a perspective view showing the protection member 70 attached to the pipe portion 50p by welding to cover the downstream exhaust gas sensor 46, and FIG. 6B is the outside of the downstream exhaust gas sensor 46 and the protection member 70 in FIG. 6A. FIG. 3 is a perspective view showing the brake pedal 24 arranged as described above. Note that in FIGS. 6A and 6B, the downstream exhaust gas sensor 46 is provided at the position of the pipe portion 50p shown in FIG. 5. The protection member 70 is provided to cover the front side and outside of the downstream exhaust gas sensor 46. As shown in FIGS. 6A and 6B, since the pipe portion 50p further includes a protective member 70 that protects the downstream exhaust gas sensor 46, the downstream exhaust gas sensor 46 is not only protected by the brake pedal 24, but also has a dedicated More secure protection can be achieved by using the protective member 70 shown in FIG. Note that the protection member 70 is made by bending a plate-like member, and has a notch 70a at a connecting corner with the pipe portion 50p.

The protective member is not limited to being produced by bending a plate-like member. For example, the protective member may be fabricated by bending the wire-like member. 7A and 7B show a protection member 72 including a wire-like member 72a and a base 72b to which the wire-like member 72a is attached. 7A is a perspective view showing the downstream exhaust gas sensor 46 covered with the protective member 72 by attaching the base 72b of the protective member 72 to the pipe portion 50p by welding, and FIG. 7B is the downstream exhaust gas sensor of FIG. 7A. 46 is a perspective view showing that the brake pedal 24 is arranged outside of the brake pedal 46 and the protection member 72 as described above. By manufacturing the protective member 72 using the wire-like member 72a, the weight of the protective member can be reduced compared to when the entire protective member is manufactured from a plate-like member. Alternatively, the entire protective member may be made of a wire-like member. In addition, in the example shown in FIG. 6A, FIG. 6B, FIG. 7A, and FIG. 7B, the

protection members

70 and 72 were attached to the pipe part 50p by welding. However, the

protection members

70, 72 may be attached by mechanical connection means such as bolts or chemical connection means other than welding.

Although the embodiments and modifications according to the present invention have been described above, the present invention is not limited thereto. Various substitutions and changes can be made without departing from the spirit and scope of the invention as defined by the claims of this application.

The number of cylinders of the internal combustion engine mounted on the straddle-type vehicle to which the present invention is applied is not particularly limited, and the number of cylinders of the internal combustion engine may be one, that is, a single cylinder, or any number of cylinders greater than or equal to two.

10...Motorcycle (straddle type vehicle)
12...Vehicle frame 14...Head pipe 22...Footrest 24...Brake pedal 25...Kick pedal 26...Engine body 30...Crank case 38...Crankshaft rotation axis 39...Exhaust device 40...Exhaust pipe 42...

Muffler

44, 46...Exhaust Gas sensor 48...purifier 48a...exhaust purification catalyst 50...exhaust pipe 50p...

pipe portions

70, 72...protection member

Claims

A straddle-type vehicle (10) equipped with an internal combustion engine (E),
an exhaust device (39) extending rearward through the lower part of the engine body (26) of the internal combustion engine (E);
A brake pedal (24),
The exhaust device (39) has a pipe portion (50p) provided to extend in the longitudinal direction of the vehicle along the brake pedal (24),
At least a portion of the exhaust gas sensor (46) provided on the pipe portion (50p) is located inside the brake pedal (24) in the vehicle width direction and is covered by the brake pedal (24). Characteristic saddle-ride type vehicle (10).
The exhaust device (39) has a purification device (48) having an exhaust purification catalyst (48a) therein on the upstream side of the exhaust gas sensor (46), and at least a part of the exhaust gas sensor (46) The straddle-type vehicle (10) according to claim 1, wherein the straddle-type vehicle (10) is hidden behind the purification device (48).
The straddle-type vehicle (10) according to claim 2, wherein the purification device (48) is located further forward of the vehicle than the front end (24f) of the brake pedal (24).
In the longitudinal direction of the vehicle, the purification device (48) is located in front of the engine main body (26), and the exhaust gas sensor (46) is located rearward of the rotation axis (38) of the crankshaft of the engine main body (46). The straddle-type vehicle (10) according to claim 2 or 3, characterized in that:
further comprising a kick pedal (25);
The straddle-type vehicle (10) according to claim 4, wherein the exhaust gas sensor (46) is arranged behind the kick pedal (25).
The straddle-type vehicle according to any one of claims 1 to 5, wherein the pipe portion (50p) further includes a protection member (70, 72) that protects the exhaust gas sensor (46). 10).