CN112031943A - Saddle-ride type vehicle - Google Patents

Abstract

The invention provides a saddle-ride type vehicle, which can compactly arrange an exhaust gas sensor and an exhaust pipe, ensure a roll angle and detect exhaust gas with high precision by using a small number of exhaust gas sensors. At least three exhaust pipes (51, 52, 53, 54) are bundled and arranged in the collecting part (60) so as to be in contact with at least two adjacent exhaust pipes, a collecting pipe (55) is arranged to cover the entire circumference of the collecting part (60), an outer side surface (74) of the collecting pipe (55) is an inclined surface that is inclined upward and outward in the vehicle width direction, and the collecting pipe (55) includes, when viewed in the axial direction of the collecting pipe (55): a 1 st surface (71) which connects two adjacent exhaust pipes (51, 54); and a 2 nd surface (72) facing the 1 st surface (71), wherein the exhaust gas sensor (59) is attached to the 1 st surface (71), and bent portions (80b, 81b) that are bent toward the exhaust gas sensor (59) are provided at ends of the exhaust pipes (52, 53) located on the 2 nd surface (72) side, said ends being located on the downstream side.

Description

Saddle-ride type vehicle

Technical Field

The present invention relates to a saddle-ride type vehicle.

Background

Conventionally, the following techniques are known: an exhaust gas sensor is provided in one of exhaust gas collection pipes of a plurality of exhaust pipes, and exhaust gas is detected by the one exhaust gas sensor (see, for example, patent document 1). In patent document 1, the flow of exhaust gas in the plurality of exhaust pipes is rectified by the rectifying plate, and the exhaust gas contacting the exhaust gas sensor is made uniform, thereby improving the detection accuracy of the exhaust gas sensor.

Documents of the prior art

Patent document 1: japanese patent laid-open publication No. 2003-83061

Disclosure of Invention

Problems to be solved by the invention

However, since the saddle-ride type vehicle has a limited space for mounting components and the vehicle body rolls, when mounting a conventional exhaust gas sensor on the saddle-ride type vehicle, it is desirable to arrange the exhaust gas sensor and the exhaust pipe compactly and to secure the roll angle of the vehicle body. Further, even with a compact configuration in which the exhaust gas sensor and the exhaust pipe are arranged, it is desirable to be able to detect exhaust gas with high accuracy by a small number of exhaust gas sensors.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a saddle-ride type vehicle in which an exhaust gas sensor and an exhaust pipe are compactly arranged, a roll angle is secured, and exhaust gas can be detected with high accuracy by a small number of exhaust gas sensors.

Means for solving the problems

A saddle-ride type vehicle is provided with: an engine 11; a plurality of exhaust pipes 51, 52, 53, 54 connected to the engine 11; a collecting portion 60, 260 where the exhaust pipes 51, 52, 53, 54 are collected; and an exhaust gas sensor 59, wherein the collecting portion 60, 260 is provided offset to the outside in the vehicle width direction with respect to the center of the vehicle width, at least three exhaust pipes 51, 52, 53, 54 are bundled together so as to be in contact with at least two adjacent exhaust pipes at the collecting portion 60, 260, a collecting pipe 55, 255 is provided that covers the entire circumference of the collecting portion 60, 260, the collecting pipe 55, 255 extends in the vehicle front-rear direction, an outer side surface 74 of the collecting pipe 55, 255 is an inclined surface that is inclined upward and outward in the vehicle width direction when viewed from the front in the upright state of the saddle type vehicle, one exhaust gas sensor 59 is provided at the collecting pipe 55, 255, and the collecting pipe 55, 255 includes: a 1 st surface 71 connecting the two adjacent exhaust pipes 51 and 54; and a 2 nd surface 72, 272 facing the 1 st surface 71, wherein the exhaust gas sensor 59 is attached to the 1 st surface 71, and a bent portion 80b, 81b bent toward the exhaust gas sensor 59 is provided at an end portion of the exhaust pipe 52, 53 located on the 2 nd surface 72, 272 side on the downstream side.

In the above configuration, the bent portions 80b and 81b may be portions formed by bending the pipes 80 and 81 having a circular cross section.

In the above configuration, the exhaust pipes 51, 52, 53, and 54 may be bundled in four pieces so that the outer shape of the manifold 55 becomes a substantially parallelogram when viewed in the axial direction of the manifold 55, and the lower surface portion 72 of the manifold 55 may be provided substantially in parallel with the floor surface G.

In the above configuration, the exhaust pipes 51, 52, 53, 54 bundled in four may be tubes 51c, 52c, 53c, 54c having polygonal cross sections at the collecting portion 60, and the polygonal tubes 51c, 52c, 53c, 54c located diagonally to each other may have the same cross sectional shape.

In the above configuration, the exhaust pipes 51, 52, 53, 54 bundled in plural may be tubes 51c, 52c, 53c, 54c having a polygonal cross section at the collecting portion 60, circular pipes 80, 81 extending from the polygonal tubes 52c, 53c into the collecting pipes 55, 255 may be provided in the exhaust pipes 52, 53 located on the 2 nd surfaces 72, 272, and the bent portions 80b, 81b may be provided in the circular pipes 80, 81.

In the above configuration, the 1 st surface 71 may be an upper surface portion of the collecting pipe 55, 255, the 2 nd surface 72, 272 may be a lower surface portion of the collecting pipe 55, 255, and the exhaust pipe 51, 52, 53, 54 may include: a pair of upper exhaust pipes 51, 54 arranged in a left-right array at the collecting portions 60, 260; and lower exhaust pipes 52, 53 disposed below the upper exhaust pipes 51, 54 at the collecting portions 60, 260, and the round pipes 80, 81 are provided in the lower exhaust pipes 52, 53.

In the above configuration, the 1 st surface 71 may be an upper surface portion of the collecting pipes 55 and 255.

In the above configuration, the collecting pipes 55 and 255 may include a narrowed portion 75 having a reduced diameter, the exhaust gas sensor 59 may be provided on the narrowed portion 75 or on a downstream side of the narrowed portion 75 in a flow direction of the exhaust gas, and the frame 10 may overlap the exhaust gas sensor 59 from an outer side in the vehicle width direction.

In the above configuration, the catalyst device 56 may be provided behind the collecting pipes 55 and 255, and the exhaust gas sensor 59 may be located below the engine 11 between the crankshaft 30 of the engine 11 and the clutch shaft 34 in a side view of the vehicle.

In the above configuration, an oil pan 83 may be provided at a lower portion of the engine 11, the oil pan 83 may include a pair of left and right concave portions 83c that are open downward and outward when the vehicle is viewed from the front, and the collecting pipes 55 and 255 may be disposed in one of the concave portions 83 c.

In the above configuration, only one exhaust gas sensor 59 may be provided in the collecting pipes 55 and 255.

In the above configuration, the exhaust gas sensor 59 may be provided at an end portion on the downstream side of the collecting pipes 55 and 255.

Effects of the invention

The present invention provides a saddle-ride type vehicle, comprising: an engine; a plurality of exhaust pipes connected to the engine; a collecting portion where a plurality of exhaust pipes are collected; and an exhaust gas sensor, the collecting portion being provided to be offset outward in the vehicle width direction with respect to a center of the vehicle width, the collecting portion being provided with at least three exhaust pipes bundled so as to be in contact with at least two adjacent exhaust pipes, the collecting portion being provided with a collecting pipe that covers an entire circumference of the collecting portion, the collecting pipe extending in the vehicle front-rear direction, an outer side surface of the collecting pipe being an inclined surface that is inclined upward and outward in the vehicle width direction when viewed from a front side in an upright state of the saddle-ride type vehicle, the collecting pipe being provided with one exhaust gas sensor, the collecting pipe including: a 1 st surface connecting two adjacent exhaust pipes; and a 2 nd surface facing the 1 st surface, the exhaust gas sensor being attached to the 1 st surface, and a bent portion bent toward the exhaust gas sensor being provided at an end portion of the exhaust pipe located on the 2 nd surface side on the downstream side.

According to this configuration, since the exhaust pipes are bundled at least three in the collecting portion so that each exhaust pipe is in contact with at least two adjacent exhaust pipes, and one exhaust sensor is provided, the exhaust pipes and the exhaust sensor can be arranged compactly. Further, since the outer surface of the collecting pipe is an inclined surface inclined upward toward the outside in the vehicle width direction, a gap between the collecting pipe and the ground can be secured when the motorcycle is tilted, and a large roll angle of the saddle-type vehicle can be secured. Further, since the exhaust gas sensor is provided on the 1 st surface of the collecting pipe, the exhaust gas in the two exhaust pipes on the 1 st surface side can be detected with high accuracy by the exhaust gas sensor. Further, the exhaust gas in the exhaust pipe located on the 2 nd surface side can be guided by the curved portion of the exhaust pipe to flow toward the exhaust gas sensor. Therefore, even when one exhaust gas sensor is provided in the manifold, the exhaust gas can be detected with high accuracy.

In the above configuration, the bent portion may be a portion formed by bending a pipe having a circular cross section.

According to this structure, the circular tube, which is relatively easily deformed, can be bent, and the bent portion can be easily formed.

In the above configuration, the plurality of exhaust pipes may be bundled into four so that the outer shape of the manifold becomes a substantially parallelogram when viewed in the axial direction of the manifold, and the lower surface portion of the manifold may be provided substantially parallel to the ground surface.

According to this configuration, the exhaust pipes can be bundled and compactly arranged, and a large distance can be secured between the lower surface portion of the collecting pipe and the floor surface.

In the above configuration, the four exhaust pipes bundled together may be polygonal pipes in cross section at the collecting portion, and the polygonal pipes located at diagonal positions may have the same cross-sectional shape.

According to this configuration, since the exhaust pipes are polygonal, the exhaust pipes can be tightly bundled, and the exhaust pipes can be compactly arranged. Further, since the cross-sectional shapes of the tubes located at diagonal positions are the same, the tubes can be easily formed.

In the above configuration, the exhaust pipes bundled into a plurality are each a pipe having a polygonal cross section at the collecting portion, the exhaust pipe located on the 2 nd surface side is provided with a round pipe extending from the polygonal pipe into the collecting pipe, and the bent portion is provided at the round pipe.

According to this configuration, since the exhaust pipes are polygonal at the collecting portion, the exhaust pipes can be tightly bundled, and the exhaust pipes can be compactly arranged. Further, even when the collecting portion is formed of polygonal tubes, the bent portion can be easily formed in a circular tube extending from the polygonal tube into the collecting portion.

In the above configuration, the 1 st surface may be an upper surface portion of the collecting pipe, the 2 nd surface may be a lower surface portion of the collecting pipe, and the exhaust pipe may include: a pair of upper exhaust pipes arranged in a left-right arrangement at the collecting part; and a lower exhaust pipe disposed below the upper exhaust pipe at the collecting portion, the circular pipe being provided in the lower exhaust pipe.

According to this configuration, since the 1 st surface on which the exhaust gas sensor is mounted is the upper surface portion of the manifold, the exhaust gas sensor can be protected from below by the manifold. Further, since the circular tube is provided in the lower exhaust pipe, the center of gravity can be lowered.

In the above configuration, the 1 st surface may be an upper surface portion of the manifold.

According to this configuration, since the 1 st surface on which the exhaust gas sensor is mounted is the upper surface portion of the manifold, the exhaust gas sensor can be protected from below by the manifold.

In the above configuration, the manifold may include a throttle portion having a reduced diameter, the exhaust gas sensor may be provided at the throttle portion or at a downstream side of the throttle portion in a flow direction of the exhaust gas, and the frame may overlap the exhaust gas sensor from an outer side in the vehicle width direction.

According to this configuration, the exhaust gas can be concentrated in the exhaust gas sensor by the throttle portion, and the exhaust gas can be detected with high accuracy by the exhaust gas sensor. Further, the exhaust gas sensor can be protected from the outside in the vehicle width direction by the vehicle body frame.

In the above configuration, the catalyst device may be provided behind the manifold, and the exhaust gas sensor may be located below the engine between a crankshaft of the engine and the clutch shaft when the vehicle is viewed from a side view of the vehicle.

With this configuration, the exhaust gas sensor and the catalyst device can be efficiently arranged.

In the above configuration, an oil pan may be provided at a lower portion of the engine, the oil pan may include a pair of left and right concave portions that are open downward and outward when the vehicle is viewed from the front, and the manifold may be disposed in one of the concave portions.

According to this structure, the right-left balance of the oil pan can be improved, and the erectness of the oil pan can be improved. Further, the collecting pipe can be compactly arranged by the concave portion of the oil pan.

In the above configuration, only one exhaust gas sensor may be provided in the manifold.

According to this configuration, exhaust gas can be detected with high accuracy by only one exhaust gas sensor.

In the above configuration, the exhaust gas sensor may be provided at an end portion on the downstream side of the manifold.

According to this configuration, since the distance from the bent portion to the exhaust gas sensor can be secured, the exhaust gas can be easily guided to the exhaust gas sensor by the bent portion, and the bending of the bent portion can be alleviated, so that the exhaust efficiency is excellent.

Drawings

Fig. 1 is a right side view of a motorcycle according to embodiment 1 of the present invention.

Fig. 2 is a perspective view of the exhaust device as viewed from the right side.

Fig. 3 is a partially exploded perspective view of the manifold in the exhaust device.

Fig. 4 is a view of the collecting unit as viewed from the downstream side.

Fig. 5 is a sectional view taken along line V-V in fig. 2.

Fig. 6 is a sectional view taken along line VI-VI in fig. 2.

Fig. 7 is a right side view of the collecting unit and the collecting pipe.

Fig. 8 is a view of the collecting portion and the exhaust gas sensor viewed from the downstream side in the axial direction of the polygonal pipe portion.

Fig. 9 is a view of the collecting unit and the exhaust gas sensor viewed from the downstream side in the axial direction of the axis of the circular tube.

Fig. 10 is a view of the collecting unit and the exhaust gas sensor viewed from the downstream side in the axial direction of the axis of the circular tube.

Fig. 11 is a right side view showing the structure of the lower portion and the peripheral portion of the engine.

Fig. 12 is a front view of the structure of the lower portion and the peripheral portion of the engine as viewed from the vehicle front side.

Fig. 13 is a sectional view taken along line XIII-XIII in fig. 11.

Fig. 14 is a view of the collecting portion and the exhaust gas sensor viewed from the downstream side in the axial direction of the polygonal pipe portion in the second embodiment.

Description of the reference symbols

1: motorcycles (saddle-ride type vehicles);

3: rear wheels (wheels);

10: a frame;

11: an engine;

30: a crankshaft;

34: a clutch shaft;

51: exhaust pipe 1 (exhaust pipe, two adjacent exhaust pipes);

51 c: a polygonal pipe portion (polygonal pipe, upper exhaust pipe);

52: a 2 nd exhaust pipe (exhaust pipe, exhaust pipe located on the 2 nd surface side);

52 c: polygonal pipe (polygonal pipe, lower exhaust pipe)

53: a 3 rd exhaust pipe (exhaust pipe, exhaust pipe located on the 2 nd surface side);

53 c: a polygonal pipe portion (polygonal pipe, lower exhaust pipe);

54: a 4 th exhaust pipe (exhaust pipe, two adjacent exhaust pipes);

54 c: a polygonal pipe portion (polygonal pipe, upper exhaust pipe);

56: a catalyst device;

55. 255: a manifold;

59: an exhaust gas sensor;

60. 260: a collecting unit;

71: 1 st surface (upper surface portion);

72. 272: the 2 nd face (lower face portion);

74: the 4 th face (outer face);

75: a throttle section;

80: round tubes (tubes with a circular cross section);

80 b: a bending section;

81: round tubes (tubes with a circular cross section);

81 b: a bending section;

83: an oil pan;

83 c: a recess.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description, the directions of the front, rear, left, right, and up and down are the same as the directions of the vehicle body, unless otherwise specified. In the drawings, reference symbol FR denotes the front of the vehicle body, UP denotes the upper of the vehicle body, and LH denotes the left of the vehicle body.

(embodiment 1)

Fig. 1 is a right side view of a motorcycle 1 according to embodiment 1 of the present invention.

The motorcycle 1 is a vehicle as follows: an engine 11 as a power unit is supported by the vehicle body frame 10, the front fork 12 supports the front wheel 2 so as to be steerable, the front fork 12 is supported at the front end of the vehicle body frame 10 so as to be steerable, and a swing arm 13 supporting the rear wheel 3 (wheels) is provided on the rear side of the vehicle body frame 10.

The motorcycle 1 is a saddle-ride type vehicle in which an occupant sits on a seat 14 in a straddling manner, and the seat 14 is provided above a rear portion of the frame 10.

The vehicle body frame 10 includes: a front seat tube 15 provided at a front end of the frame 10; a pair of left and right main frames 16 extending rearward and downward from the front stand pipe 15; a pair of left and right lower frames 17 extending downward from the front stand pipe 15; and a pair of left and right bottom frames 18 extending rearward from the rear end of the lower frame 17 and connected to the lower end of the main frame 16.

The body frame 10 further includes a pair of left and right seat frames 19 extending rearward from the main frame 16. A pivot portion 20 that supports the swing arm 13 is provided at a lower end portion of the main frame 16.

Specifically, the lower end of the lower frame 17 is bent rearward and extends rearward. The front end of the bottom frame 18 is coupled to the rear end of the lower frame 17 by a weld 18a provided at the front end. The bottom frame 18 includes: a rearward extending portion 18b extending rearward through a lower portion of the engine 11; and an upper extending portion 18c extending rearward and upward from a rear end of the rear extending portion 18b and connected to the seat frame 19. The lower end of the main frame 16 is connected to the upper and lower intermediate portions of the upper extending portion 18 c.

The front fork 12 is rotatably supported by the frame 10 via a steering shaft (not shown) inserted through the front seat tube 15. The steering handlebar 27 is provided at the upper end of the front fork 12. The front wheel 2 is pivotally supported on an axle 2a provided at a lower end portion of the front fork 12.

The swing arm 13 is pivotally supported by a pivot shaft 23, and the pivot shaft 23 is supported by the left and right pivot portions 20. The pivot shaft 23 extends horizontally in the vehicle width direction. The swing arm 13 swings up and down about the pivot shaft 23 by pivotally supporting the tip end portion on the pivot shaft 23.

The rear wheel 3 is pivotally supported on an axle 3a provided at a rear end of the swing arm 13.

The motorcycle 1 includes a rear suspension 24 that is bridged between a rear end portion of the swing arm 13 and the seat frame 19.

Engine 11 is disposed between main frame 16 and bottom frame 18 at the rear of lower frame 17, and is fixed to vehicle body frame 10.

The engine 11 includes: a crankcase 31 that supports a crankshaft 30 extending horizontally in a vehicle width direction (left-right direction); and a cylinder portion 32 extending upward from an upper surface of a front portion of the crankcase 31. The cylinder portion 32 includes a cylinder 32a, a cylinder head 32b, and a head cover 32c in this order from the crankcase 31 side.

A piston 32d reciprocating in the cylinder 32a is connected to the crankshaft 30 via a connecting rod (not shown).

The cylinder axis 32e of the cylinder 32a is inclined forward with respect to the vertical direction.

The engine 11 is a tandem multi-cylinder engine in which a plurality of cylinders in which pistons 32d are arranged in an axial direction (vehicle width direction) of a crankshaft 30. In embodiment 1, the engine 11 is an inline four-cylinder engine, and four cylinders are arranged in the axial direction of the crankshaft 30.

Specifically, the engine 11 includes a 1 st cylinder, a 2 nd cylinder, a 3 rd cylinder, and a 4 th cylinder in this order from one side in the vehicle width direction (the vehicle left side). In fig. 1, the outer side of the 4 th cylinder can be seen.

A transmission case portion 31a accommodating a transmission (not shown) is provided at the rear of the crankcase 31.

The transmission case portion 31a is provided with a clutch device 33, and the clutch device 33 switches between disconnection and connection of the transmission of rotation between the crankshaft 30 and the transmission. The clutch device 33 is a friction clutch device, and is supported by a clutch shaft 34 provided in the transmission case 31 a. The clutch shaft 34 is disposed in parallel with the crankshaft 30 at the rear of the crankshaft 30.

The output of the engine 11 is transmitted to the rear wheels 3 through a drive train 35 connecting the output shaft of the transmission and the rear wheels 3.

An exhaust device 36 of the engine 11 is connected to an exhaust port in the front surface of the cylinder head 32 b.

An intake device 37 of the engine 11 is connected to an intake port in the rear surface of the cylinder head 32 b.

The fuel tank 38 is disposed above the main frame 16 between the front seat pipe 15 and the seat 14. The seat 14 is disposed above the seat frame 19.

The motorcycle 1 includes: a front cover 39 that covers the upper portion of the front fork 12 and the front seat tube 15 from the front and the right and left sides; and a side cover 40 that covers a lower portion of the seat 14 from the side.

The front fender 41 is supported by the front fork 12.

A pair of left and right foot rests 42 on which the feet of the occupant of the seat 14 are placed are disposed behind the left and right pivot portions 20.

A pair of right and left side cases 43 are mounted on the side of the rear portion of the motorcycle 1.

Fig. 2 is a perspective view of exhaust device 36 as viewed from the right side.

Referring to fig. 1 and 2, the exhaust device 36 includes: a 1 st exhaust pipe 51 (exhaust pipe, two adjacent exhaust pipes) connected to the exhaust port of the 1 st cylinder in the cylinder head 32 b; a 2 nd exhaust pipe 52 (exhaust pipe, exhaust pipe located on the 2 nd surface side) connected to the exhaust port of the 2 nd cylinder on the cylinder head 32 b; a 3 rd exhaust pipe 53 (exhaust pipe, exhaust pipe located on the 2 nd surface side) connected to the exhaust port of the 3 rd cylinder in the cylinder head 32 b; and a 4 th exhaust pipe 54 (exhaust pipe, adjacent 2 exhaust pipes) connected to the exhaust port of the 4 th cylinder in the cylinder head 32 b.

Further, the exhaust device 36 includes: one collecting pipe 55 connected to downstream end portions of the 1 st exhaust pipe 51, the 2 nd exhaust pipe 52, the 3 rd exhaust pipe 53, and the 4 th exhaust pipe 54; a catalyst device 56 connected to the downstream end of the manifold 55; a connection pipe 57 that protrudes from the downstream end of the catalyst device 56; and a muffler 58 (fig. 1) connected to a downstream end of the connection pipe 57.

The exhaust device 36 is provided with an exhaust sensor 59 that detects exhaust gas flowing in the exhaust device 36.

The exhaust gas flowing through the 1 st exhaust pipe 51, the 2 nd exhaust pipe 52, the 3 rd exhaust pipe 53, and the 4 th exhaust pipe 54 flows through the collecting pipe 55, the catalyst device 56, the connecting pipe 57, and the muffler 58 in this order, and is discharged to the outside from the muffler 58.

The engine connection portions 51a, 52a, 53a, and 54a at the upstream ends of the 1 st exhaust pipe 51, the 2 nd exhaust pipe 52, the 3 rd exhaust pipe 53, and the 4 th exhaust pipe 54 are connected to the respective exhaust ports of the cylinder head 32 b. That is, the 1 st exhaust pipe 51, the 2 nd exhaust pipe 52, the 3 rd exhaust pipe 53, and the 4 th exhaust pipe 54 are arranged in the vehicle width direction in this order from one side (the vehicle left side) in the vehicle width direction.

The 1 st exhaust pipe 51, the 2 nd exhaust pipe 52, the 3 rd exhaust pipe 53, and the 4 th exhaust pipe 54 include downward extending portions 51b, 52b, 53b, and 54b extending downward from the engine connecting portions 51a, 52a, 53a, and 54a in front of the engine 11. The lower end portions of the downward extending portions 51b, 52b, 53b, 54b are bent rearward and positioned below the front portion of the crankcase 31.

Fig. 3 is a partially exploded perspective view of the manifold 55 in the exhaust device 36.

Polygonal pipe portions 51c, 52c, 53c, and 54c (polygonal pipes) having a polygonal cross section are provided at the downstream end portions of the downward extending portions 51b, 52b, 53b, and 54b in the flow of the exhaust gas.

The exhaust device 36 has a collecting portion 60 in which polygonal pipe portions 51c, 52c, 53c, and 54c are bundled and collected. The collecting portion 60 is located below the front portion of the crankcase 31, and extends in the vehicle front-rear direction.

Fig. 4 is a view of the collecting unit 60 as viewed from the downstream side (rear side). In fig. 4, the circular tube 80 and the circular tube 81 to be described later are not shown.

The polygonal pipe portion 51c of the 1 st exhaust pipe 51 is a pipe having a pentagonal cross section. Specifically, the polygonal tube 51c is formed by fitting an outer tube 51d having a pentagonal cross section to the outer periphery of a portion formed into a pentagon by expanding the diameter of the end of the lower extension 51 b. The 1 st exhaust pipe 51 is a pipe having a circular cross section upstream of the polygonal pipe portion 51 c.

The polygonal pipe portion 51c of the 2 nd exhaust pipe 52 is a pipe having a quadrangular cross section. The polygonal tube 52c is formed by fitting an outer cylinder 52d having a square cross section to the outer periphery of a portion formed in a square shape by expanding the diameter of the end of the lower extension 52 b. The 2 nd exhaust pipe 52 is a pipe having a circular cross section upstream of the polygonal pipe portion 52 c.

The polygonal pipe portion 53c of the 3 rd exhaust pipe 53 is a pipe having a pentagonal cross section. The polygonal tube 53c is formed by fitting an outer cylinder 53d having a pentagonal cross section to the outer periphery of a portion formed into a pentagon by expanding the diameter of the end of the lower extension 53 b. The 3 rd exhaust pipe 53 is a pipe having a circular cross section upstream of the polygonal pipe portion 53 c.

The polygonal pipe portion 54c of the 4 th exhaust pipe 54 is a pipe having a quadrangular cross section. The polygonal tube 54c is formed by fitting an outer cylinder 54d having a square cross section to the outer periphery of a portion formed in a square shape by expanding the diameter of the end of the downward extension 54 b. The 4 th exhaust pipe 54 is a pipe having a circular cross section upstream of the polygonal pipe portion 54 c.

Specifically, the polygonal pipe portion 51c of the 1 st exhaust pipe 51 is formed into a pentagon in the view shown in fig. 4 as viewed in the axial direction, and includes: a bottom surface 61 a; a pair of side surfaces 61b, 61c rising from both ends of the bottom surface 61 a; and a pair of top surfaces 61d, 61e extending from ends of the side surfaces 61b, 61c close to each other and intersecting at an apex portion 61 f.

The apex portion 61f is an apex facing the bottom surface 61 a. The side surfaces 61b and 61c are spaced apart from each other at a larger distance from the bottom surface 61a toward the vertex 61 f.

The polygonal tube 51c is a pentagon having a center line 61g, which is a bisector of the bottom surface 61a, as a center.

The polygonal pipe portion 53c of the 3 rd exhaust pipe 53 is formed in a pentagonal shape, like the polygonal pipe portion 51c, and includes a bottom surface 63a, a pair of side surfaces 63b, 63c, and a pair of top surfaces 63d, 63e intersecting at a vertex 63 f.

The polygonal tube 51c and the polygonal tube 53c are disposed such that the bottom surface 61a abuts the bottom surface 63 a. The polygonal tube portion 51c and the polygonal tube portion 53c are arranged symmetrically about a symmetry axis 65 passing through a contact surface between the bottom surface 61a and the bottom surface 63a and extending parallel to the contact surface. The axis of symmetry 65 is perpendicular to the centre line 61 g.

The center line 61g of the polygonal pipe portion 51c coincides with the center line 63g of the polygonal pipe portion 53 c.

The side surfaces 61b and 63b are inner surfaces in the vehicle width direction, and the side surfaces 61c and 63c are outer surfaces in the vehicle width direction.

The polygonal pipe portion 52c of the 2 nd exhaust pipe 52 is formed in a quadrangular shape, and includes: a bottom surface 62a abutting against the side surface 61 b; a bottom surface 62b abutting against the side surface 63 b; a top surface 62c opposed to the bottom surface 62 a; and a top surface 62 opposite the bottom surface 62 b.

The polygonal tube portion 52c is a quadrangle having a symmetrical shape about the symmetry axis 65. The apex 62e where the bottom surface 62a intersects the bottom surface 62b and the apex 62f where the top surface 62c intersects the top surface 62d are located on the symmetry axis 65.

The polygonal pipe portion 54c of the 4 th exhaust pipe 54 has the same shape as the polygonal pipe portion 52c of the 2 nd exhaust pipe 52, and the polygonal pipe portion 54c and the polygonal pipe portion 52c are arranged symmetrically about the center line 61 g.

The polygonal pipe portion 54c of the 4 th exhaust pipe 54 is formed in a quadrangular shape, and includes: a bottom surface 64a abutting against the side surface 61 c; a bottom surface 64b abutting against the side surface 63 c; a top surface 64c opposed to the bottom surface 64 a; and a top surface 64d opposite the bottom surface 64 b.

The polygonal pipe portion 54c is a quadrangle having a symmetrical shape about the symmetry axis 65. An apex 64e where the bottom surface 64a intersects the bottom surface 64b and an apex 64f where the top surface 64c intersects the top surface 64d are located on the symmetry axis 65.

The collecting portion 60 is a portion in which four polygonal tube portions 51c, 52c, 53c, and 54c are bundled and arranged so that the outer shape of the collecting portion 60 becomes a parallelogram when the collecting portion 60 is viewed in the axial direction.

Specifically, the polygonal pipe portions 51c and 54c are arranged in a left-right array in a state of abutting against each other.

The polygonal pipe portion 52c and the polygonal pipe portion 53c are arranged in a left-right manner below the polygonal pipe portion 51c and the polygonal pipe portion 54c in a state of abutting against each other.

The polygonal pipe portion 51c and the polygonal pipe portion 54c are upper exhaust pipes disposed above the polygonal pipe portion 52c and the polygonal pipe portion 53 c. The polygonal pipe portion 52c and the polygonal pipe portion 53c are lower exhaust pipes disposed below the polygonal pipe portion 51c and the polygonal pipe portion 54 c.

The outer peripheral surface 66 of the collecting portion 60 is formed by the top surface 61e, the top surface 64d, the top surface 64c, the top surface 63e, the top surface 63d, the top surface 62c, the top surface 62d, and the top surface 61 d. The outer peripheral surface 66 has a parallelogram shape. Specifically, the outer shape of the outer peripheral surface 66 is a rhombus having a diagonal line defined by the axis of symmetry 65 and the center line 61 g. When the symmetry axis 65 and the center line 61g are viewed as diagonal lines of the diamond, the symmetry axis 65 is a diagonal line longer than the center line 61 g. The collecting portion 60 is disposed such that the axis of symmetry 65 is a diagonal line that is inclined upward as it goes outward in the vehicle width direction.

Since the outer peripheral surface 66 has a rhombic shape, the upper surface 66a of the outer peripheral surface 66 is parallel to the lower surface 66b, and the inner surface 66c of the outer peripheral surface 66 is parallel to the outer surface 66 d.

The upper surface 66a and the lower surface 66b are substantially horizontal when the collecting portion 60 is viewed in the axial direction, and are substantially parallel to the ground.

The inner surface 66c and the outer surface 66d are inclined surfaces that are inclined so as to be positioned upward as they face outward in the vehicle width direction when the collecting portion 60 is viewed in the axial direction.

In the collecting portion 60, the polygonal pipe portion 51c is in contact with three exhaust pipes, namely, the polygonal pipe portion 52c, the polygonal pipe portion 53c, and the polygonal pipe portion 54 c.

In the collecting portion 60, the polygonal pipe portion 52c abuts against the two exhaust pipes, the polygonal pipe portion 51c and the polygonal pipe portion 53 c.

In the collecting portion 60, the polygonal pipe portion 53c is in contact with three exhaust pipes, namely, the polygonal pipe portion 51c, the polygonal pipe portion 52c, and the polygonal pipe portion 54 c.

In the collecting portion 60, the polygonal pipe portion 54c abuts against the two exhaust pipes, the polygonal pipe portion 51c and the polygonal pipe portion 53 c.

That is, in the collecting portion 60, the polygonal pipe portions 51c, 52c, 53c, and 54c are bundled in four so as to be in contact with at least two adjacent exhaust pipes.

Fig. 5 is a sectional view taken along line V-V in fig. 2. Fig. 6 is a sectional view taken along line VI-VI in fig. 2. Fig. 7 is a right side view of the collecting unit 60 and the collecting pipe 55. In fig. 7, a lower half 69 to be described later is not shown.

Referring to fig. 1 to 7, the collecting pipe 55 is a pipe extending in the vehicle longitudinal direction below the crankcase 31, and an upstream end 55a on the front end side is connected to the collecting portion 60, and a downstream end 55b on the rear end side is connected to the catalyst device 56.

The manifold 55 is formed in a tubular shape by joining a plate-like upper half 68 and a plate-like lower half 69 which are divided vertically.

The collecting pipe 55 is connected to the collecting portion 60 by fitting the outer peripheral surface 66 of the collecting portion 60 to the inner peripheral surface of the upstream end 55 a.

The collecting pipe 55 covers the entire circumference of the outer peripheral surface 66 of the collecting portion 60. The collecting pipe 55 is formed to match the outer peripheral surface 66 of the collecting portion 60, and the outer shape of the collecting pipe 55 is a rhombus in the axial direction as in the outer peripheral surface 66 when the collecting pipe 55 is assembled.

Specifically, as shown in fig. 6, when the manifold 55 is viewed in the axial direction, the manifold 55 includes: a 1 st surface 71 connecting the polygonal tube portion 51c and the polygonal tube portion 54c adjacent to each other in the left-right direction; a 2 nd surface 72 connecting the polygonal tube portion 52c and the polygonal tube portion 53c adjacent to each other in the left-right direction; a 3 rd surface 73 connecting the polygonal tube portion 51c and the polygonal tube portion 52c adjacent to each other in the up-down direction; and a 4 th surface connecting the polygonal pipe portion 54c and the polygonal pipe portion 53c adjacent to each other in the up-down direction.

The 2 nd surface 72 is substantially horizontal and is a lower surface portion of the rhombic collecting pipe 55. Specifically, the 2 nd surface 72 is slightly inclined so as to be positioned downward toward the vehicle width direction outer side. The 2 nd surface 72 covers the lower surface 66b of the outer peripheral surface 66.

The 1 st surface 71 is parallel to the 2 nd surface 72 and is an upper surface portion of the rhombic manifold 55. The 1 st surface 71 covers the upper surface 66a of the outer peripheral surface 66.

The 4 th surface 74 is an outer surface portion of the rhombic collecting pipe 55, and is an inclined surface inclined upward and outward in the vehicle width direction in a front view in an upright state of the motorcycle 1. The 4 th surface 74 covers the outer side surface 66d of the outer peripheral surface 66.

The 3 rd surface 73 is parallel to the 4 th surface 74, and is an inner surface portion of the rhombic collecting pipe 55. The 3 rd surface 73 covers the inner surface 66c of the outer peripheral surface 66.

The 1 st and 3 rd surfaces 71, 73 are provided on the upper half 68, and the 2 nd and 4 th surfaces 72, 74 are provided on the lower half 69.

Referring to fig. 5 and 7, a throttle portion 75 formed by reducing the diameter of the collecting pipe 55 is provided at the rear portion of the collecting pipe 55. The inner diameter of the throttle section 75 is smaller than the inner diameter of the upstream end 55a of the collecting pipe 55 and the inner diameter of the downstream end 55b of the collecting pipe 55.

The catalyst device 56 includes an outer cylindrical portion 56a and a catalyst body (not shown) housed in the outer cylindrical portion 56 a. The downstream end 55b of the collecting pipe 55 is fitted to the upstream end of the outer cylindrical portion 56a of the catalyst device 56, and is connected to the catalyst device 56. The downstream end 55b matches the shape of the outer cylindrical portion 56a, and is formed in a circular shape when viewed in the axial direction.

A sensor mounting portion 76 to which the exhaust gas sensor 59 is mounted is provided on the 1 st surface 71 of the manifold 55. The sensor mounting portion 76 is a cylindrical portion that vertically penetrates the 1 st surface 71.

Referring to fig. 5, the exhaust gas sensor 59 is rod-shaped and includes a detection portion 59a at a distal end portion thereof for detecting the oxygen concentration of the exhaust gas. An electric wire 59b for transmitting the detection result of the detection unit 59a to a control unit (not shown) of the motorcycle 1 is connected to the base end portion of the exhaust gas sensor 59.

The exhaust gas sensor 59 is inserted into the sensor mounting portion 76 from the outside, and the detection portion 59a is disposed in the manifold 55. The exhaust gas sensor 59 is disposed obliquely so that an axis 59c of the exhaust gas sensor 59 is directed outward and upward in the vehicle width direction when the manifold 55 is viewed in the axial direction.

The exhaust gas sensor 59 is provided on the 1 st surface 71 at an end portion downstream of the throttle portion 75 and downstream of the manifold 55.

Referring to fig. 6, the collecting portion 60 is integrally formed by welding the bottom surface 61a and the bottom surface 63a, the side surface 61b and the bottom surface 62a, the side surface 61c and the bottom surface 64a, the bottom surface 64b and the side surface 63c, and the side surface 63b and the bottom surface 62b, respectively.

Further, substantially the entire circumference of the upstream end 55a of the collecting pipe 55 is welded to the outer circumferential surface 66 of the collecting portion 60.

The polygonal tube portion 51c and the polygonal tube portion 53c are arranged diagonally to each other. The polygonal tube portion 51c and the polygonal tube portion 53c have the same shape, and are formed into a pentagon by plastic working using the same die. Therefore, the dies can be used in common, and the polygonal pipe portions 51c and 53c can be easily manufactured.

The polygonal tube portion 52c and the polygonal tube portion 54c are arranged diagonally to each other. The polygonal tube portion 52c and the polygonal tube portion 54c have the same shape, and are formed into a square shape by plastic working using the same die. Therefore, the dies can be used in common, and the polygonal pipe portions 52c and 54c can be easily manufactured.

Fig. 8 is a view of the collecting portion 60 and the exhaust gas sensor 59 viewed from the downstream side in the axial direction of the polygonal pipe portion 51c and the polygonal pipe portion 54 c. In fig. 8, the manifold 55 is shown in phantom lines.

Referring to fig. 3 and 5 to 8, in the collecting portion 60, circular pipes 80 and 81 projecting toward the downstream side in the collecting pipe 55 are provided in the polygonal pipe portion 52c and the polygonal pipe portion 53c on the 2 nd surface 72 side, respectively. The circular tubes 80, 81 are tubes having a circular cross section.

The circular tube 80 is inserted into the polygonal tube portion 52c from the downstream side, and is fitted to the inner peripheral portion of the portion on the upstream side of the polygonal tube portion 52c at the downwardly extending portion 52b, and the circular tube 80 is fixed to the downwardly extending portion 52b by welding.

Referring to fig. 7 and 8, the circular tube 80 is positioned inward and downward in the vehicle width direction with respect to the detection portion 59a of the exhaust gas sensor 59. Further, the circular tube 80 is located on the upstream side with respect to the detection portion 59 a.

The circular tube 80 includes a curved portion 80b that is curved so that an opening 80a at the downstream end of the circular tube 80 faces the detection portion 59 a. That is, the curved portion 80b curves the circular tube 80 outward and upward in the vehicle width direction.

As shown in fig. 7, an axis 80c of the circular tube 80 extending downstream from the opening 80a overlaps the detection portion 59 a.

The circular tube 81 is inserted into the polygonal pipe portion 53c from the downstream side, fitted to the inner peripheral portion of the portion on the upstream side of the polygonal pipe portion 53c at the downwardly extending portion 53b, and the circular tube 81 is fixed to the downwardly extending portion 53b by welding.

Referring to fig. 7 and 8, the round pipe 81 is located upstream and below the detection portion 59a of the exhaust gas sensor 59.

The circular tube 81 includes a curved portion 81b that is curved so that an opening 81a at the downstream end of the circular tube 81 faces the detection portion 59 a. That is, the curved portion 81b curves the circular tube 81 upward.

As shown in fig. 7, an axis 81c of the circular tube 81 extending downstream from the opening 81a overlaps the detection portion 59 a.

As shown in fig. 8, when the collecting portion 60 and the exhaust gas sensor 59 are viewed from the downstream side in the axial direction of the polygonal pipe portion 51c and the polygonal pipe portion 54c, the detection portion 59a overlaps the downstream end opening 51e of the polygonal pipe portion 51c and the downstream end opening 54e of the polygonal pipe portion 54 c.

Thus, the exhaust gas flowing from the polygonal pipe portion 51c to the collecting pipe 55 and the exhaust gas flowing from the polygonal pipe portion 54c to the collecting pipe 55 directly contact the detection portion 59 a. Therefore, the exhaust gas in the 1 st exhaust pipe 51 and the 4 th exhaust pipe 54 can be detected with high accuracy by the exhaust gas sensor 59.

When the exhaust gas sensor 59 is viewed from the downstream side in the axial direction of the polygonal pipe portion 51c and the polygonal pipe portion 54c, the detection portion 59a is located above the polygonal pipe portion 52c and the polygonal pipe portion 53c and does not overlap the polygonal pipe portion 52c and the polygonal pipe portion 53 c. Therefore, it is not necessary to specially lengthen the detection portion 59a, and a general exhaust gas sensor 59 can be used.

Fig. 9 is a view of the collecting portion 60 and the exhaust gas sensor 59 viewed from the downstream side in the axial direction of the axis 80c of the circular tube 80.

As shown in fig. 9, the detection portion 59a overlaps the opening 80a of the circular tube 80 of the polygonal tube portion 52c when viewed in the axial direction of the axis 80c of the circular tube 80.

Thus, the exhaust gas flowing from the polygonal pipe portion 52c to the collecting pipe 55 through the circular pipe 80 directly contacts the detecting portion 59 a. Therefore, the exhaust gas of the 2 nd exhaust pipe 52 can be detected with high accuracy by the exhaust gas sensor 59.

Fig. 10 is a view of the collecting section 60 and the exhaust gas sensor 59 viewed from the downstream side in the axial direction of the axis 81c of the circular tube 81.

As shown in fig. 10, the detection portion 59a overlaps the opening 81a of the circular tube 81 of the polygonal tube portion 53c when viewed in the axial direction of the axis 81c of the circular tube 81.

Thus, the exhaust gas flowing from the polygonal pipe portion 53c to the collecting pipe 55 through the circular pipe 81 directly contacts the detecting portion 59 a. Therefore, the exhaust gas of the 3 rd exhaust pipe 53 can be detected with high accuracy by the exhaust gas sensor 59.

That is, in embodiment 1, the exhaust gas of the 1 st exhaust pipe 51, the exhaust gas of the 2 nd exhaust pipe 52, the exhaust gas of the 3 rd exhaust pipe 53, and the exhaust gas of the 4 th exhaust pipe 54 directly contact the detection portion 59 a. Therefore, the exhaust gas can be detected with high accuracy by the exhaust gas sensor 59.

The exhaust gas flowing from the collecting portion 60 to the collecting pipe 55 passes through the throttle portion 75 to be a concentrated flow, and then contacts the exhaust sensor 59 downstream of the throttle portion 75, so that the exhaust gas can be efficiently blown to the exhaust sensor 59, and the exhaust gas can be detected with high accuracy by the exhaust sensor 59.

Further, since the circular tubes 80 and 81 have a circular cross section, bending is easier than, for example, a tube having a polygonal cross section. Therefore, the bent portion 80b and the bent portion 81b can be easily formed.

As shown in fig. 8, the polygonal tube 51c and the polygonal tube 54c are in contact with each other via a contact surface 86 between the side surface 61c and the bottom surface 64 a.

The polygonal tube portion 52c and the polygonal tube portion 53c are in contact with each other via the contact surface 87 between the bottom surface 62b and the side surface 63 b.

The abutment surface 86 and the abutment surface 87 are parallel to each other. The contact surfaces 86 and 87 extend in the vertical direction when the manifold 55 is viewed in the axial direction, and are arranged in a direction perpendicular to the 1 st surface 71 of the manifold 55.

The polygonal tube portion 52c and the polygonal tube portion 51c are in contact with each other via a contact surface 88 between the bottom surface 62a and the side surface 61 b.

The polygonal pipe portion 53c and the polygonal pipe portion 54c are in contact with each other via a contact surface 89 between the side surface 63c and the bottom surface 64 b.

The contact surface 88 and the contact surface 89 are parallel to each other, and are disposed in a direction perpendicular to the 4 th surface 74 of the collecting pipe 55 when the collecting pipe 55 is viewed in the axial direction.

Fig. 11 is a right side view showing the structure of the lower portion and the peripheral portion of the engine 11. Fig. 12 is a front view of the structure of the lower portion and the peripheral portion of the engine 11 as viewed from the vehicle front side. Fig. 13 is a sectional view taken along line XIII-XIII in fig. 11.

Referring to fig. 11 to 13, the engine 11 includes an oil pan 83 attached to the lower surface 31b of the crankcase 31. The oil pan 83 stores oil of the engine 11.

The oil pan 83 is disposed at the center in the vehicle width direction and overlaps the center line C of the motorcycle 1 in the vehicle width direction. The center line C is a vertical line passing through a ground contact portion 3b (fig. 12) of the rear wheel 3 with respect to the ground G in the upright state of the motorcycle 1.

In a front view, oil pan 83 includes: a mounting portion 83a fastened to the lower surface 31b of the crankcase 31 by a bolt; and an oil reservoir 83b that bulges downward relative to the mounting portion 83 a.

The oil reservoir 83b is provided at the center in the vehicle width direction, and the mounting portions 83a are provided on the left and right of the oil reservoir 83b, respectively.

By bulging the oil reservoir 83b downward, a pair of right and left recesses 83c are formed in the oil pan 83 on the outer side of the oil reservoir 83b and below the mounting portion 83 a. The concave portion 83c is open downward and outward when the vehicle is viewed from the front.

The oil pan 83 is formed substantially in bilateral symmetry about the center line C. Therefore, the standing property of the oil pan 83 when the oil pan 83 is placed during maintenance work or the like is good, and the work is easy.

The collecting portion 60 and the collecting pipe 55 are located on the outer side in the vehicle width direction with respect to the center line C, and are provided offset to the outer side in the vehicle width direction with respect to the center of the vehicle width.

More specifically, the collecting portion 60, the collecting pipe 55, and the catalyst device 56 have their distal ends disposed in the recess 83c on one side (right side) in the vehicle width direction, and overlap the oil reservoir 83b from the outside in the vehicle width direction when the vehicle is viewed in side view. Further, a muffler 58 (fig. 1) is disposed outside the rear wheel 3 behind the catalyst device 56.

The upper portions of the collecting portion 60 and the collecting pipe 55 are disposed in the recess 83c, and the lower portions of the collecting portion 60 and the collecting pipe 55 are located below the lower surface 83d of the oil reservoir 83 b.

The collecting pipe 55 is disposed inward in the vehicle width direction of the bottom frame 18 on one side (right side) in the vehicle width direction, and the collecting pipe 55 is disposed between the rearward extending portion 18b of the bottom frame 18 and the oil reservoir 83b in the vehicle width direction.

Referring to fig. 11 and 13, the rearward extending portion 18b of the one bottom frame 18 overlaps the upper portion of the collecting portion 60 and the exhaust gas sensor 59 from the outside in the vehicle width direction in a side view of the vehicle, and covers the upper portion of the collecting portion 60 and the exhaust gas sensor 59. Therefore, the exhaust gas sensor 59 can be protected by the bottom frame 18, and the exhaust gas sensor 59 can be hidden by the bottom frame 18, so that the appearance can be improved.

The exhaust gas sensor 59 is disposed rearward offset from the welded portion 18a between the lower frame 17 and the bottom frame 18. Therefore, the welding portion 18a can be prevented from interfering with the arrangement of the exhaust gas sensor 59, and the degree of freedom in the arrangement of the exhaust gas sensor 59 is high.

Further, since the exhaust gas sensor 59 is provided on the 1 st surface 71 which is the upper surface portion of the collecting pipe 55, the exhaust gas sensor 59 can be protected from below by the collecting pipe 55.

Further, the exhaust gas sensor 59 is covered with the crankcase 31 from above. Therefore, the exhaust gas sensor 59 can be protected from above by the crankcase 31.

Circular pipes 80 and 81 are provided on polygonal pipe portions 52c and 53c disposed below polygonal pipe portions 51c and 54 c. Therefore, the center of gravity of the collecting unit 60 can be lowered.

A pressure sensor 84 that detects the pressure of oil in crankcase 31 is attached to the outer surface of the lower portion of crankcase 31 above exhaust gas sensor 59 and rearward extending portion 18b of bottom frame 18.

Referring to fig. 6 and 12, the 2 nd surface 72, which is the lower surface portion of the rhombic collecting pipe 55, is substantially parallel to the ground G in the upright state of the motorcycle 1. Therefore, the distance between the 2 nd surface 72 and the ground surface G can be secured to be large, and the minimum height above the ground of the motorcycle 1 can be increased.

As shown in fig. 12, the foot pedal 42 includes a roll sensor portion 42a projecting downward. The lower end of the roll sensor portion 42a is the 1 st landing portion 42b that is first in contact with the ground G when the motorcycle 1 is tilted in the left-right direction.

The 1 st land portion 42b is located outward and upward in the vehicle width direction with respect to the collecting pipe 55.

Fig. 12 shows a straight line L1 connecting the center landing part 3b of the rear wheel 3 and the 1 st landing part 42 b. Fig. 12 shows a straight line L2 connecting a side end portion 3c of the rear wheel 3 (which becomes a landing point of the rear wheel 3 and the ground G when the motorcycle 1 is tilted in the left-right direction) and the 1 st landing portion 42 b. The straight line L1 and the straight line L2 are inclined upward and outward in the vehicle width direction.

The 4 th surface 74 as the outer surface portion of the collecting pipe 55 is provided substantially parallel to the line L2 on the vehicle width direction inner side with respect to the line L1 and the line L2. Therefore, when the motorcycle 1 rolls along with a turn, the distance between the ground surface G and the 4 th surface 74 of the manifold 55 can be ensured, and the roll angle of the motorcycle 1 can be increased.

Fig. 1 and 11 show a vertical straight line 34a indicating the position of the clutch shaft 34 in the vehicle longitudinal direction and a vertical straight line 30a indicating the position of the crankshaft 30 in the vehicle longitudinal direction.

The collecting pipe 55 and the catalyst device 56 are disposed to extend in the front-rear direction below the crankcase 31, and the catalyst device 56 is located behind the collecting pipe 55.

The exhaust gas sensor 59 provided on the 1 st surface 71 of the collecting pipe 55 is located forward of the clutch shaft 34 and rearward of the crankshaft 30 below the crankcase 31, and is located between the clutch shaft 34 and the crankshaft 30 in the vehicle front-rear direction.

As described above, according to embodiment 1 to which the present invention is applied, the motorcycle 1 includes: an engine 11; a plurality of 1 st exhaust pipe 51, 2 nd exhaust pipe 52, 3 rd exhaust pipe 53, and 4 th exhaust pipe 54 connected to the engine 11; a collecting portion 60 where a plurality of the 1 st exhaust pipe 51, the 2 nd exhaust pipe 52, the 3 rd exhaust pipe 53, and the 4 th exhaust pipe 54 are collected; and an exhaust gas sensor 59, the collecting portion 60 being provided to be offset outward in the vehicle width direction with respect to the center of the vehicle width, the collecting portion 60 being provided with at least three (four in embodiment 1) exhaust pipes of the 1 st exhaust pipe 51, the 2 nd exhaust pipe 52, the 3 rd exhaust pipe 53, and the 4 th exhaust pipe 54 bundled together so as to be in contact with at least two adjacent exhaust pipes, the collecting portion 60 being provided with a collecting pipe 55 that covers the entire circumference of the collecting portion 60, the collecting pipe 55 extending in the vehicle front-rear direction, the 4 th surface 74 that is the outer surface of the collecting pipe 55 being an inclined surface that is inclined outward and upward in the vehicle width direction when viewed from the front in the upright state of the motorcycle 1, the collecting pipe 55 being provided with one exhaust gas sensor 59, the collecting pipe 55 being provided with: a 1 st surface 71 connecting two adjacent 1 st exhaust pipes 51 and 4 th exhaust pipes 54; and a 2 nd surface 72 facing the 1 st surface 71, the exhaust gas sensor 59 being disposed on the 1 st surface 71, and a bent portion 80b and a bent portion 81b bent toward the exhaust gas sensor 59 being provided at downstream end portions of the 2 nd exhaust pipe 52 and the 3 rd exhaust pipe 53 located on the 2 nd surface 72 side.

According to this configuration, since the plurality of 1 st exhaust pipe 51, 2 nd exhaust pipe 52, 3 rd exhaust pipe 53, and 4 th exhaust pipe 54 are bundled and provided in at least three in the collecting portion 60 so that each exhaust pipe contacts at least two adjacent exhaust pipes, and one exhaust sensor 59 is provided, the 1 st exhaust pipe 51, the 2 nd exhaust pipe 52, the 3 rd exhaust pipe 53, and the 4 th exhaust pipe 54 and the exhaust sensor 59 can be arranged compactly. Further, since the 4 th surface 74 of the collecting pipe 55 is an inclined surface inclined upward toward the outside in the vehicle width direction, a gap can be secured between the collecting pipe 55 and the ground G when the motorcycle 1 is tilted, and a large roll angle of the motorcycle 1 can be secured. Further, since the exhaust gas sensor 59 is provided on the 1 st surface 71 of the collecting pipe 55, the exhaust gas in the two 1 st exhaust pipes 51 and the 4 th exhaust pipe 54 on the 1 st surface 71 side can be detected with high accuracy by the exhaust gas sensor 59. The exhaust gas in the 2 nd exhaust pipe 52 and the 3 rd exhaust pipe 53 located on the 2 nd surface 72 side can be guided by the curved portion 80b and the curved portion 81b to flow toward the exhaust gas sensor 59. Therefore, even when one exhaust gas sensor 59 is provided in the manifold 55, the exhaust gas can be detected with high accuracy.

The curved portions 80b and 81b are portions formed by bending the circular tubes 80 and 81 having circular cross sections.

According to this configuration, the circular tube which is relatively easily deformed can be bent, and the bent portion 80b and the bent portion 81b can be easily formed.

The 1 st exhaust pipe 51, the 2 nd exhaust pipe 52, the 3 rd exhaust pipe 53, and the 4 th exhaust pipe 54 are bundled in four so that the outer shape of the collecting pipe 55 becomes a substantially parallelogram when viewed in the axial direction of the collecting pipe 55, and the 2 nd surface 72 as the lower surface portion of the collecting pipe 55 is provided substantially parallel to the floor surface G.

With this configuration, the 1 st exhaust pipe 51, the 2 nd exhaust pipe 52, the 3 rd exhaust pipe 53, and the 4 th exhaust pipe 54 can be bundled and compactly arranged, and a large distance can be secured between the lower surface portion of the collecting pipe 55 and the floor surface G.

The 1 st exhaust pipe 51, the 2 nd exhaust pipe 52, the 3 rd exhaust pipe 53, and the 4 th exhaust pipe 54 bundled in four have a polygonal pipe portion 51c, a polygonal pipe portion 52c, a polygonal pipe portion 53c, and a polygonal pipe portion 54c at the collecting portion 60, and the polygonal pipe portion 51c, the polygonal pipe portion 52c, the polygonal pipe portion 53c, and the polygonal pipe portion 54c are each a pipe having a polygonal cross section. The polygonal pipe portions 51c and 53c located diagonally to each other have the same cross-sectional shape. The cross-sectional shapes of the polygonal pipe portion 52c and the polygonal pipe portion 54c located diagonally to each other are the same.

According to this configuration, since the polygonal pipe portion 51c, the polygonal pipe portion 52c, the polygonal pipe portion 53c, and the polygonal pipe portion 54c are polygonal, the polygonal pipe portion 51c, the polygonal pipe portion 52c, the polygonal pipe portion 53c, and the polygonal pipe portion 54c can be tightly bundled, and the 1 st exhaust pipe 51, the 2 nd exhaust pipe 52, the 3 rd exhaust pipe 53, and the 4 th exhaust pipe 54 can be compactly arranged. Further, since the polygonal pipe portion 51c and the polygonal pipe portion 53c have the same cross-sectional shape, and the polygonal pipe portion 52c and the polygonal pipe portion 54c have the same cross-sectional shape, a polygonal pipe can be easily formed.

The 1 st exhaust pipe 51, the 2 nd exhaust pipe 52, the 3 rd exhaust pipe 53, and the 4 th exhaust pipe 54 bundled together in plural are each a pipe having a polygonal cross section at the collecting portion 60. The 2 nd exhaust pipe 52 and the 3 rd exhaust pipe 53 located on the 2 nd surface 72 side are provided with a circular pipe 80 and a circular pipe 81 extending from the polygonal pipe portion 52c and the polygonal pipe portion 53c into the collecting pipe 55, and the curved portion 80b and the curved portion 81b are provided in the circular pipe 80 and the circular pipe 81.

According to this configuration, since the 1 st exhaust pipe 51, the 2 nd exhaust pipe 52, the 3 rd exhaust pipe 53, and the 4 th exhaust pipe 54 are polygonal at the collecting portion 60, the 1 st exhaust pipe 51, the 2 nd exhaust pipe 52, the 3 rd exhaust pipe 53, and the 4 th exhaust pipe 54 can be bundled tightly, and the 1 st exhaust pipe 51, the 2 nd exhaust pipe 52, the 3 rd exhaust pipe 53, and the 4 th exhaust pipe 54 can be arranged compactly. Even when the collecting portion 60 is formed of a polygonal pipe, the bent portions 80b and 81b can be easily formed in the circular pipe 80 and the circular pipe 81 extending from the polygonal pipe into the collecting pipe 55.

The 1 st surface 71 is an upper surface portion of the collecting pipe 55, the 2 nd surface 72 is a lower surface portion of the collecting pipe 55, and the 1 st exhaust pipe 51, the 2 nd exhaust pipe 52, the 3 rd exhaust pipe 53, and the 4 th exhaust pipe 54 include: a polygonal pipe portion 51c and a polygonal pipe portion 54c which are a pair of upper exhaust pipes arranged in a left-right array at the collecting portion 60; and a polygonal pipe portion 52c and a polygonal pipe portion 53c which are lower exhaust pipes disposed below the upper exhaust pipes in the collecting portion 60, and the round pipes 80 and 81 are provided in the lower exhaust pipes.

According to this configuration, since the 1 st surface 71 on which the exhaust gas sensor 59 is mounted is the upper surface portion of the manifold 55, the exhaust gas sensor 59 can be protected from below by the manifold 55. Further, since the round pipe 80 and the round pipe 81 are provided in the lower exhaust pipe, the center of gravity can be lowered.

The manifold 55 is provided with a throttle portion 75 having a reduced diameter, the exhaust gas sensor 59 is provided downstream of the throttle portion 75 in the flow direction of the exhaust gas, and the vehicle body frame 10 overlaps the exhaust gas sensor 59 from the outside in the vehicle width direction.

According to this configuration, the exhaust gas can be concentrated in the exhaust sensor 59 by the throttle portion 75, and the exhaust gas can be detected with high accuracy by the exhaust sensor 59. Further, the exhaust gas sensor 59 can be protected from the outside in the vehicle width direction by the vehicle frame 10.

Further, a catalyst device 56 is provided behind the collecting pipe 55, and an exhaust gas sensor 59 is located below the engine 11 between the crankshaft 30 of the engine 11 and the clutch shaft 34 in a side view of the vehicle.

With this configuration, the exhaust gas sensor 59 and the catalyst device 56 can be efficiently arranged.

In addition, only one exhaust gas sensor 59 is provided in the manifold 55.

With this configuration, exhaust gas can be detected with high accuracy by only one exhaust gas sensor 59.

Further, the exhaust gas sensor 59 may be provided at the end portion on the downstream side of the collecting pipe 55.

According to this configuration, since the distance from the bent portion 80b and the bent portion 81b to the exhaust gas sensor 59 can be secured, the exhaust gas can be easily guided to the exhaust gas sensor 59 through the bent portion 80b and the bent portion 81b, and the bending of the bent portion 80b and the bent portion 81b can be alleviated, so that the exhaust efficiency is good.

An oil pan 83 is provided at a lower portion of the engine 11, the oil pan 83 includes a pair of left and right concave portions 83c that are open downward and outward when the vehicle is viewed from the front, and the manifold 55 is disposed in one concave portion 83 c.

With this configuration, the right-left balance of the oil pan 83 can be improved, and the standing property of the oil pan 83 can be improved. Further, the collecting pipe 55 can be compactly arranged by the recess 83c of the oil pan 83.

[ 2 nd embodiment ]

Hereinafter, embodiment 2 to which the present invention is applied will be described with reference to fig. 14. In embodiment 2, the same reference numerals are given to the same components as those in embodiment 1, and the description thereof is omitted.

While the above-described embodiment 1 has described the case where four polygonal pipe portions 51c, polygonal pipe portions 52c, polygonal pipe portions 53c, and polygonal pipe portions 54c are arranged in a bundled manner in the collecting portion 60, the present embodiment 2 is different from the above-described embodiment 1 in that three polygonal pipe portions 51c, polygonal pipe portions 53c, and polygonal pipe portions 54c are bundled together.

Fig. 14 is a view of the collecting portion 260 and the exhaust gas sensor 59 as viewed from the downstream side in the axial direction of the polygonal pipe portion 51c and the polygonal pipe portion 54c in embodiment 2. In fig. 14, the manifold 255 is shown by phantom lines.

In embodiment 2, an engine having three cylinders arranged in series is mounted in place of the engine 11, and an exhaust device 236 is connected to the engine.

The exhaust device 236 includes: the 1 st exhaust pipe 51; the 3 rd exhaust pipe 53; the 4 th exhaust pipe 54; one collecting pipe 255 connected to downstream end portions of the 1 st exhaust pipe 51, the 3 rd exhaust pipe 53, and the 4 th exhaust pipe 54; a catalyst device 56 (fig. 2) connected to the downstream end of the manifold 255; a connecting pipe 57 (fig. 1) that protrudes from the downstream end of the catalyst device 56; and a muffler 58 (fig. 1) connected to a downstream end of the connection pipe 57.

Further, the exhaust device 236 includes an exhaust sensor 59.

That is, the exhaust unit 236 is a structure in which the 2 nd exhaust pipe 52 is removed from the exhaust unit 36 of embodiment 1.

The 1 st exhaust pipe 51, the 3 rd exhaust pipe 53, and the 4 th exhaust pipe 54 are bundled at the collecting portion 260.

The collecting portion 260 is a portion in which three polygonal pipe portions 51c, 53c, and 54c are bundled, and the outer shape of the collecting portion 260 is substantially triangular when viewed in the axial direction of the collecting portion 260.

Specifically, the polygonal pipe portions 51c and 54c are arranged in a left-right array in a state of abutting against each other.

The polygonal pipe portion 53c is disposed below the polygonal pipe portion 51c and the polygonal pipe portion 54c, and is disposed so as to be in contact with the polygonal pipe portion 51c and the polygonal pipe portion 54 c.

The polygonal pipe portion 51c and the polygonal pipe portion 54c are upper exhaust pipes disposed above the polygonal pipe portion 53 c. The polygonal pipe portion 53c is a lower exhaust pipe disposed below the polygonal pipe portion 51c and the polygonal pipe portion 54 c.

The outer peripheral surface 266 of the collecting portion 260 is formed by the top surface 61e, the top surface 64d, the top surface 64c, the top surface 63e, the top surface 63d, the side surface 63b, the side surface 61b, and the top surface 61 d. The outer peripheral surface 266 has a substantially triangular shape.

The collecting unit 260 is disposed so that one vertex of the triangle points downward.

The outer peripheral surface 266 is formed in a substantially triangular shape including an upper surface 66a, a lower surface 266b, an outer side surface 66d, and an inner side surface 266 c.

The upper surface 66a is parallel to the lower surface 266 b. Since the collecting portion 260 is a triangle having one vertex directed downward, the lower surface 266b is shorter than the upper surface 66a in the vehicle width direction when the collecting portion 260 is viewed in the axial direction.

In the collecting portion 60, the polygonal pipe portion 51c is in contact with the two exhaust pipes, the polygonal pipe portion 53c and the polygonal pipe portion 54 c.

In the collecting portion 260, the polygonal pipe portion 53c abuts against the two exhaust pipes, the polygonal pipe portion 51c and the polygonal pipe portion 54 c.

In the collecting portion 260, the polygonal pipe portion 54c abuts against the two exhaust pipes, the polygonal pipe portion 51c and the polygonal pipe portion 53 c.

That is, in the collecting portion 260, three polygonal pipe portions 51c, 53c, and 54c are bundled so as to be in contact with two adjacent exhaust pipes.

The collecting pipe 255 is connected to the collecting part 260 by fitting the outer peripheral surface 266 of the collecting part 260 to the inner peripheral surface of the upstream end of the collecting pipe 255.

The collecting pipe 255 covers the entire circumference of the outer circumferential surface 266 of the collecting portion 260. The collecting pipe 255 is formed to match the outer peripheral surface 266 of the collecting portion 260, and the outer shape of the collecting pipe 255 is substantially triangular as the outer peripheral surface 266 when viewed in the axial direction of the collecting pipe 255.

Specifically, the manifold 255 includes: a 1 st surface 71 connecting the polygonal tube portion 51c and the polygonal tube portion 54c adjacent to each other in the left-right direction when viewed in the axial direction of the collecting tube 255; a 2 nd surface 272 covering the lower surface 266b of the collecting portion 260; a 3 rd surface 273 covering the inner surface 266c of the collecting portion 260; and a 4 th surface 74 connecting the polygonal pipe portion 54c and the polygonal pipe portion 53c adjacent to each other in the up-down direction.

The 2 nd surface 272 is substantially horizontal and is a lower surface portion of the substantially triangular manifold 255. Specifically, the 2 nd surface 272 is slightly inclined so as to be positioned downward toward the vehicle width direction outer side.

The 1 st surface 71 is parallel to the 2 nd surface 272, and is an upper surface portion of the substantially triangular manifold 255. The 1 st surface 71 covers the upper surface 66a of the outer peripheral surface 266.

The 4 th surface 74 is an outer surface portion of the substantially triangular collecting pipe 255, and is an inclined surface inclined upward toward the outside in the vehicle width direction in a front view. The 4 th surface 74 covers the outer side surface 66d of the outer peripheral surface 266.

The 3 rd surface 273 is an inner surface portion of the substantially triangular collecting pipe 255 and covers the inner surface 266c of the outer peripheral surface 266.

The exhaust gas sensor 59 is attached to the 1 st surface 71 of the collecting pipe 255 in the same configuration as the sensor attachment portion 76 (fig. 3).

The polygonal pipe portion 53c as the lower exhaust pipe is provided with a circular pipe 81 extending downstream in the collecting pipe 55.

The collecting pipe 255 includes a throttle portion similar to the throttle portion 75 (fig. 7) of the above-described embodiment 1 on the 1 st surface 71, and the exhaust gas sensor 59 is disposed behind the throttle portion.

The collecting pipe 255 is disposed in the recess 83c (fig. 13).

The exhaust gas flowing from the polygonal pipe portion 51c to the collecting pipe 255 and the exhaust gas flowing from the polygonal pipe portion 54c to the collecting pipe 255 directly contact the detection portion 59 a. Therefore, the exhaust gas in the 1 st exhaust pipe 51 and the 4 th exhaust pipe 54 can be detected with high accuracy by the exhaust gas sensor 59.

The exhaust gas flowing from the polygonal pipe portion 53c to the collecting pipe 255 through the circular pipe 81 is guided by the circular pipe 81 toward the detecting portion 59a, and directly contacts the detecting portion 59 a. Therefore, the exhaust gas in the 3 rd exhaust pipe 53 can be detected with high accuracy by the exhaust gas sensor 59.

According to a second embodiment, the motorcycle 1 includes: a plurality of 1 st exhaust pipe 51, 3 rd exhaust pipe 53, and 4 th exhaust pipe 54 connected to the engine; a collecting portion 260 where the plurality of 1 st exhaust pipes 51, 3 rd exhaust pipes 53, and 4 th exhaust pipes 54 are collected; and an exhaust gas sensor 59, the collecting portion 260 being provided to be offset outward in the vehicle width direction with respect to the center of the vehicle width, the collecting portion 260 being provided with three exhaust pipes of the 1 st exhaust pipe 51, the 3 rd exhaust pipe 53, and the 4 th exhaust pipe 54 bundled so as to be in contact with two adjacent exhaust pipes, the collecting portion 260 being provided with a collecting pipe 255 that covers the entire circumference of the collecting portion 260, the collecting pipe 255 extending in the vehicle front-rear direction, the 4 th surface 74 that is the outer surface of the collecting pipe 255 being an inclined surface that is inclined outward and upward in the vehicle width direction when viewed from the front in the upright state of the motorcycle 1, the collecting pipe 255 being provided with one exhaust gas sensor 59, the collecting pipe 255 being provided with: a 1 st surface 71 connecting two adjacent 1 st exhaust pipes 51 and 4 th exhaust pipes 54; and a 2 nd surface 272 facing the 1 st surface 71, the exhaust gas sensor 59 being attached to the 1 st surface 71, and a bent portion 81b bent toward the exhaust gas sensor 59 being provided at an end portion of the 3 rd exhaust pipe 53 located on the 2 nd surface 272 side on the downstream side.

According to this configuration, since the 1 st exhaust pipe 51, the 3 rd exhaust pipe 53, and the 4 th exhaust pipe 54 are bundled at the collecting portion 260 so that two adjacent exhaust pipes are in contact with each other and the exhaust sensor 59 is provided, the 1 st exhaust pipe 51, the 3 rd exhaust pipe 53, the 4 th exhaust pipe 54, and the exhaust sensor 59 can be arranged compactly. Further, since the 4 th surface 74 of the collecting pipe 255 is an inclined surface inclined upward toward the outside in the vehicle width direction, a gap can be secured between the collecting pipe 255 and the ground G when the motorcycle 1 is tilted, and a large roll angle of the motorcycle 1 can be secured. Further, since the exhaust gas sensor 59 is provided on the 1 st surface 71 of the collecting pipe 255, the exhaust gas in the two 1 st exhaust pipes 51 and the 4 th exhaust pipe 54 on the 1 st surface 71 side can be detected with high accuracy by the exhaust gas sensor 59. The exhaust gas in the 3 rd exhaust pipe 53 on the 2 nd surface 272 side can be guided by the curved portion 81b to flow toward the exhaust gas sensor 59. Therefore, even when one exhaust gas sensor 59 is provided in the manifold 55, the exhaust gas can be detected with high accuracy.

The above-described embodiments 1 and 2 show an embodiment to which the present invention is applied, and the present invention is not limited to the above-described embodiments 1 and 2.

In the above-described embodiments 1 and 2, the case where the exhaust gas sensor 59 is provided downstream of the throttle portion 75 has been described, but the present invention is not limited thereto, and the exhaust gas sensor 59 may be provided in the throttle portion 75.

In the above-described embodiments 1 and 2, the case where only one exhaust gas sensor 59 is provided has been described, but the present invention is not limited to this, and another exhaust gas sensor may be additionally provided in the manifolds 55 and 255.

In addition, in the above-described embodiments 1 and 2, the automatic two-wheeled vehicle 1 was described as an example of the saddle-type vehicle, but the present invention is not limited to this, and the present invention can be applied to a three-wheeled saddle-type vehicle having two front wheels or two rear wheels, and a saddle-type vehicle having four or more wheels.

Claims (12)

1. A saddle-ride type vehicle is provided with:

an engine (11); a plurality of exhaust pipes (51, 52, 53, 54) connected to the engine (11); a collecting unit (60, 260) where the exhaust pipes (51, 52, 53, 54) are collected; and an exhaust gas sensor (59),

the saddle-ride type vehicle is characterized in that,

the collecting portion (60, 260) is provided so as to be offset outward in the vehicle width direction with respect to the center of the vehicle width, and at least three exhaust pipes (51, 52, 53, 54) are bundled together at the collecting portion (60, 260) so as to be in contact with at least two adjacent exhaust pipes,

a collecting pipe (55, 255) covering the entire circumference of the collecting part (60, 260), the collecting pipe (55, 255) extending in the vehicle front-rear direction,

an outer surface (74) of the collecting pipe (55, 255) is an inclined surface inclined upward and outward in the vehicle width direction when viewed from the front in the standing state of the saddle-ride type vehicle,

one exhaust gas sensor (59) is arranged at the collecting pipe (55, 255),

the collecting pipe (55, 255) comprises, when viewed in the axial direction of the collecting pipe (55, 255): a 1 st surface (71) connecting the two adjacent exhaust pipes (51, 54); and a 2 nd surface (72, 272) facing the 1 st surface (71),

the exhaust gas sensor (59) is attached to the 1 st surface (71), and a bent portion (80b, 81b) that is bent toward the exhaust gas sensor (59) is provided at an end portion of the exhaust pipe (52, 53) located on the 2 nd surface (72, 272) side on the downstream side.

2. The saddle-ride type vehicle according to claim 1,

the bent portions (80b, 81b) are portions formed by bending tubes (80, 81) having a circular cross section.

3. The saddle-ride type vehicle according to claim 1 or 2,

the exhaust pipes (51, 52, 53, 54) are bundled in four so that the outer shape of the collecting pipe (55) becomes a substantially parallelogram when viewed in the axial direction of the collecting pipe (55),

the lower surface portion (72) of the manifold (55) is disposed substantially parallel to the ground (G).

4. The saddle-ride type vehicle according to claim 3,

the four exhaust pipes (51, 52, 53, 54) bundled together are tubes (51c, 52c, 53c, 54c) having a polygonal cross section at the collecting portion (60),

the polygonal tubes (51c, 52c, 53c, 54c) located diagonally to each other have the same cross-sectional shape.

5. The saddle-ride type vehicle according to any one of claims 1 to 4,

the exhaust pipes (51, 52, 53, 54) bundled in plural are tubes (51c, 52c, 53c, 54c) having a polygonal cross section at the collecting portion (60),

the exhaust pipe (52, 53) on the 2 nd surface (72, 272) side is provided with a circular pipe (80, 81) extending from the polygonal pipe (52c, 53c) into the collecting pipe (55, 255),

the bent portion (80b, 81b) is provided at the circular tube (80, 81).

6. The saddle-ride type vehicle according to claim 5,

the 1 st surface (71) is an upper surface portion of the manifold (55, 255), the 2 nd surface (72, 272) is a lower surface portion of the manifold (55, 255),

the exhaust pipe (51, 52, 53, 54) includes: a pair of upper exhaust pipes (51, 54) arranged in a left-right array at the collecting part (60, 260); and a lower exhaust pipe (52, 53) disposed below the upper exhaust pipe (51, 54) at the collecting portion (60, 260),

the circular tube (80, 81) is provided in the lower exhaust pipe (52, 53).

7. The saddle-ride type vehicle according to any one of claims 1 to 5,

the 1 st surface (71) is an upper surface portion of the manifold (55, 255).

8. The saddle-ride type vehicle according to any one of claims 1 to 7,

the collecting pipe (55, 255) is provided with a throttle part (75) with a reduced diameter, the exhaust gas sensor (59) is arranged at the throttle part (75) or at the downstream side of the throttle part (75) in the flowing direction of the exhaust gas,

the vehicle body frame (10) overlaps the exhaust gas sensor (59) from the outside in the vehicle width direction.

9. The saddle-ride type vehicle according to any one of claims 1 to 8,

a catalyst device (56) is provided behind the collecting pipe (55, 255), and the exhaust gas sensor (59) is located between a crankshaft (30) of the engine (11) and a clutch shaft (34) below the engine (11) in a side view of the vehicle.

10. The saddle-ride type vehicle according to any one of claims 1 to 9,

an oil pan (83) is provided at the lower part of the engine (11), the oil pan (83) is provided with a pair of left and right concave parts (83c) which are opened downwards and outwards when the vehicle is viewed from the front,

the collecting pipe (55, 255) is arranged in one of the recesses (83 c).

11. The saddle-ride type vehicle according to any one of claims 1 to 10,

only one exhaust gas sensor (59) is provided in the collecting pipe (55, 255).

12. The saddle-ride type vehicle according to any one of claims 1 to 11,

the exhaust gas sensor (59) is provided at an end portion on the downstream side of the collecting pipe (55, 255).

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