DE102020114432A1 - Saddle seat vehicle - Google Patents

Abstract

[Problem] To compactly arrange an exhaust gas sensor and an exhaust pipe while ensuring a bank angle and to detect exhaust air with high accuracy by a small number of exhaust gas sensors at least three of the pipes arranged in a bundle so as to be in contact with at least the two adjacent exhaust pipes. A merging pipe 55 covering an entire circumference of the merging area 60 is arranged. An outside 74 of the merging pipe 55 is an inclined surface that is inclined outward and upward in a vehicle width direction. When viewed in an axial direction of the merging pipe 55, the merging pipe 55 has a first surface 71 that connects two adjacent exhaust pipes 51 and 54, and a second surface 72 that is opposite to the first surface 71. An exhaust gas sensor 59 is attached to the first surface 71. Bent portions 80b and 81b that bend toward the exhaust gas sensor 59 are disposed at end portions positioned on downstream sides of the exhaust pipes 52 and 53 on the second surface 72 side.

Description

[Technical scope]

The present invention relates to a saddle seat vehicle.

[State of the art]

Conventionally, a technique is known by which exhaust air is detected with an exhaust gas sensor by placing the exhaust gas sensor on a pipe where the exhaust air is collected from a plurality of exhaust pipes (see, for example, Patent Document 1). In Patent Document 1, the detection accuracy with the exhaust gas sensor is improved by straightening the flow of the exhaust gas from the plurality of exhaust pipes with a straightening fin and ensuring uniformity of the exhaust air coming into contact with the exhaust gas sensor.

[List of cited documents]

[Patents]

[Patent Document 1] JP-A No. 2003-83061

[Overview of the invention]

[Technical problem]

In the case of a saddle-seat vehicle, a mounting space for components is limited and a vehicle body is sloped. Accordingly, when a conventional exhaust gas sensor is attached to the saddle-seat vehicle, it is preferable to arrange the exhaust gas sensor and an exhaust pipe in a compact manner and to ensure a bank angle of the vehicle body. Moreover, even in a structure in which the exhaust gas sensor and the exhaust pipe are compactly arranged, it is preferable that the exhaust air can be detected with high accuracy by means of a small number of exhaust gas sensors.

The present invention has been made in view of the above-mentioned circumstances, and it is an object thereof to provide a saddle seat vehicle in which an exhaust gas sensor and an exhaust pipe are compactly arranged while securing a bank angle and exhaust air with high accuracy using a small one Number of exhaust gas sensors can be detected.

[Solution to the problem]

A saddle seat vehicle points to an engine ( 11 ), a variety of with the engine ( 11 ) connected exhaust pipes ( 51 , 52 , 53 and 54 ), a merge area ( 60 and 260 ), on which the large number of exhaust pipes ( 51 , 52 , 53 and 54 ) and an exhaust gas sensor ( 59 ). In the saddle seat vehicle is the merging area ( 60 and 260 ) arranged offset outward in a vehicle width direction with respect to a center of the vehicle width. The respective exhaust pipes ( 51 , 52 , 53 and 54 ) are arranged in a bundle with at least three of the pipes so as to be able to communicate with at least the two adjacent exhaust pipes in the junction area ( 60 and 260 ) to be in contact. A merging pipe ( 55 and 255 ), which covers a total of the merge area ( 60 and 260 ) covers is arranged. The merging pipe ( 55 and 255 ) runs in a longitudinal direction of the vehicle. When viewed in a front view of the saddle-seat vehicle in an upright state, an outer surface ( 74 ) of the merging pipe ( 55 and 255 ) an inclined surface inclined outward and upward in the vehicle width direction. The merging pipe ( 55 and 255 ) is equipped with an exhaust gas sensor ( 59 ) intended. In an axial direction of the merging pipe ( 55 and 255 ), the merging pipe ( 55 and 255 ) a first surface ( 71 ), the two adjacent exhaust pipes ( 51 and 54 ) connects, and a second face ( 72 and 272 ) that go to the first surface ( 71 ) is opposite. The exhaust gas sensor ( 59 ) is on the first surface ( 71 ) appropriate. A curved area ( 80b and 81b) pointing in the direction of the exhaust gas sensor ( 59 ) bends, is at one end area on a downstream side of the exhaust pipe ( 52 and 53 ) on the side of the second face ( 72 and 272 ) positioned arranged.

In addition, in the design described above, the curved area ( 80b and 81b) be an area in which a pipe ( 80 and 81 ) has circular cross-sectional area bends.

In addition, the configuration described above can be designed as follows. The variety of exhaust pipes ( 51 , 52 , 53 and 54 ) are arranged in a bundle with four of the tubes, so that an external shape of the joining tube ( 55 ) in the axial direction of the merging pipe ( 55 ) is considered roughly a parallelogram. A sub-page area ( 72 ) of the merging pipe ( 55 ) is arranged approximately parallel to the floor (G).

In addition, the configuration described above can be designed as follows. The exhaust pipes ( 51 , 52 , 53 and 54 ) are four pipes that lead to pipes ( 51c , 52c , 53c and 54c) are bundled, the respective polygonal cross-sectional areas in the merging area ( 60 ) to have. The polygonal tubes ( 51c , 52c , 53c and 54c) that are positioned diagonally next to each other have an identical cross-sectional shape.

In addition, the configuration described above can be designed as follows. The exhaust pipes ( 51 , 52 , 53 and 54 ), a large number of which are bundled, are pipes ( 51c , 52c , 53c , and 54c) , the respective polygonal cross-sectional areas in the merging area ( 60 and 260 ) to have. The exhaust pipe ( 52 and 53 ) on the side of the second face ( 72 and 272 ) is positioned is connected to a circular tube ( 80 and 81 ) provided by the polygonal tubes ( 52c and 53c) into the merging pipe ( 55 and 255 ) runs. The curved area ( 80b and 81b) is in the circular tube ( 80 and 81 ) arranged.

In addition, the configuration described above can be designed as follows. The first face ( 71 ) is an upper surface area of the merging tube ( 55 and 255 ). The second face ( 72 and 272 ) is a lower side area of the merging tube ( 55 and 255 ). The exhaust pipes ( 51 , 52 , 53 and 54 ) have a pair of upper exhaust pipes ( 51 and 54 ), which are next to each other on the left and right in the merge area ( 60 and 260 ) are arranged, and a lower exhaust pipe ( 52 and 53 ) under the upper exhaust pipes ( 51 and 54 ) in the merge area ( 60 and 260 ) is arranged. The circular pipe ( 80 and 81 ) is in the lower exhaust pipe ( 52 and 53 ) arranged.

In addition, in the design described above, the first surface ( 71 ) an upper surface area of the merging tube ( 55 and 255 ) his.

In addition, the configuration described above can be configured as follows. The merging pipe ( 55 and 255 ) has a narrowed area ( 75 ) in which a diameter is narrowed. The exhaust gas sensor ( 59 ) is at the narrowed area ( 75 ) or on a downstream side of the narrowed area ( 75 ) arranged in a stream of exhaust air. A body frame ( 10 ) overlaps the exhaust gas sensor ( 59 ) from an outside in the vehicle width direction.

In addition, the configuration described above can be configured as follows. A catalyst device ( 56 ) is on a rear side of the merging tube ( 55 and 255 ) arranged. The exhaust gas sensor ( 59 ) is under the engine ( 11 ) and between a crankshaft ( 30th ) of the motor ( 11 ) and a coupling shaft ( 34 ) viewed in a side view of the vehicle.

In addition, the configuration described above can be configured as follows. An oil pan ( 83 ) is on a lower area of the engine ( 11 ) arranged. The oil pan ( 83 ) has a pair of left and right relief areas ( 83c) that open downward and to outer lateral sides when viewed in a front view of the vehicle. The merging pipe ( 55 and 255 ) is at one of the recess areas ( 83c) arranged.

In addition, in the design described above, the merging pipe ( 55 and 255 ) with only one exhaust gas sensor ( 59 ) be provided.

In addition, in the design described above, the exhaust gas sensor ( 59 ) at one end area on a downstream side of the merging pipe ( 55 and 255 ) be arranged.

[Advantageous Effects of Invention]

A saddle-seat vehicle has an engine, a plurality of exhaust pipes connected to the engine, a merging portion where the plurality of exhaust pipes are merged, and an exhaust gas sensor. The merging area is offset outward in a vehicle width direction with respect to a center of the vehicle width. The respective exhaust pipes are arranged in a bundle with at least three of the pipes so as to be in contact with at least the two adjacent exhaust pipes in the junction area. A merging pipe that covers an entire circumference of the merging area is arranged. The merging pipe runs in a vehicle longitudinal direction. When viewed in a front view of the saddle-seat vehicle in an upright state, an outer surface of the merging pipe is an inclined surface that is inclined outward and upward in the vehicle width direction. The merging pipe is provided with an exhaust gas sensor. When viewed in an axial direction of the merging pipe, the merging pipe has a first surface that connects two adjacent exhaust pipes and a second surface that is opposite to the first surface. The exhaust gas sensor is attached to the first surface. A bent portion that bends toward the exhaust gas sensor is disposed at an end portion positioned on a downstream side of the exhaust pipe on the second surface side.

In this configuration, the plurality of exhaust pipes are arranged in a bundle with at least three of the pipes in the merging area, so that the respective exhaust pipes are in contact with at least the two adjacent exhaust pipes, and an exhaust gas sensor is arranged. Accordingly, the exhaust pipes and the exhaust gas sensor can be arranged in a compact manner. In addition, since the outer surface of the merging pipe is the inclined surface that slopes outward and upward in the vehicle width direction, a clearance between the The confluence pipe and a floor can be ensured when the saddle vehicle tilts, and a large tilt angle of the saddle vehicle can be ensured. In addition, since the exhaust gas sensor is arranged on the first surface of the merging pipe, the exhaust pipe from the two exhaust pipes on the first side surface can be detected with high accuracy by the exhaust gas sensor. Furthermore, exhaust air can be guided from the exhaust pipe positioned on the second surface side through the bent region of the exhaust pipe in order to be passed on in the direction of the exhaust gas sensor. In view of this, even when an exhaust gas sensor is arranged on the merging pipe, the exhaust air can be detected with high accuracy.

In addition, in the configuration described above, the bent portion may be a portion where a pipe having a circular cross-sectional area bends.

In this configuration, a circular tube that is relatively easily deformed is bent in order to be able to easily form the bent portion.

In addition, the configuration described above can be designed as follows. The plurality of exhaust pipes are arranged in a bundle with four of the pipes so that an outer shape of the merging pipe becomes approximately a parallelogram when viewed in the axial direction of the merging pipe. A lower surface area of the merging pipe is arranged approximately parallel to the floor.

With this configuration, the exhaust pipes can be arranged in a bundle in a compact manner, and a large distance between the lower surface portion of the merging pipe and the floor can be ensured.

In addition, the configuration described above can be designed as follows. The exhaust pipes as four pipes to be bundled are pipes that have corresponding polygonal cross-sectional areas in the merging area. The polygonal tubes, which are positioned diagonally next to one another, have an identical cross-sectional shape.

With this configuration, since the exhaust pipes are polygonal, the exhaust pipes can be closely bundled and the exhaust pipes can be arranged in a compact manner. In addition, since the diagonally positioned tubes have an identical cross-sectional shape, the tubes can be easily formed.

In addition, the configuration described above can be configured as follows. The exhaust pipes, a plurality of which are bundled, are pipes each having polygonal cross-sectional areas in the junction area. The exhaust pipe positioned on the side of the second surface is provided with a circular pipe that extends from the polygonal pipes into the merging pipe. The bent portion is arranged in the circular tube.

With this configuration, since the exhaust pipes are polygonal in the junction area, the exhaust pipes can be tightly bundled and the exhaust pipes can be arranged in a compact manner. In addition, even if the merging portion is formed by polygonal pipes, the bent portion can be easily formed on the circular pipe that extends from the polygonal pipe into the merging pipe.

In addition, the configuration described above can be configured as follows. The first surface is a top surface area of the merging tube. The second surface is a lower surface area of the merging tube. The exhaust pipes have a pair of upper exhaust pipes which are arranged side by side on the left and right in the merging area, and a lower exhaust pipe which is arranged under the upper exhaust pipes in the merging area. The circular pipe is arranged in the lower exhaust pipe.

With this configuration, since the first surface to which the exhaust gas sensor is attached is the upper surface portion of the merging pipe, the merging pipe can protect the exhaust gas sensor from an underside. In addition, since the circular pipe is arranged in the lower exhaust pipe, a center of gravity can be lowered.

In addition, in the configuration described above, the first surface can be an upper surface area of the merging pipe.

With this configuration, since the first surface to which the exhaust gas sensor is attached is the upper surface area of the merging pipe, the merging pipe can protect the exhaust gas sensor from below.

In addition, the configuration described above can be configured as follows. The merging pipe has a narrowed area in which a diameter is narrowed. The exhaust gas sensor is arranged on the constricted area or on a downstream side of the constricted area in a stream of the exhaust air. One The body frame overlaps the exhaust gas sensor from an outside in the vehicle width direction.

With this configuration, the exhaust air for the exhaust gas sensor can be collected by the restricted area, and the exhaust air can be detected by the exhaust gas sensor with high accuracy. In addition, the body frame can protect the exhaust gas sensor from the outside in the vehicle width direction.

In addition, the configuration described above can be configured as follows. A catalyst device is arranged on a rear side of the merging pipe. The exhaust gas sensor is positioned below the engine and between a crankshaft of the engine and a clutch shaft as viewed in a side view of the vehicle.

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

In addition, the configuration described above can be configured as follows. An oil pan is disposed on a lower portion of the engine. The oil pan has a pair of left and right recess portions that open downward and to outer lateral sides when viewed in a front view of the vehicle. The merging pipe is arranged on one of the recess areas.

With this configuration, the oil pan can be properly balanced left and right, and the ability of the oil pan to stand upright can be improved. In addition, the merging pipe can be arranged in a compact manner by means of the recess area of the oil pan.

In addition, in the configuration described above, the merging pipe can be provided with only one exhaust gas sensor.

With this design, the exhaust air can be detected with a high degree of accuracy by the only one exhaust gas sensor.

In addition, in the configuration described above, the exhaust gas sensor can be arranged at an end region on a downstream side of the merging pipe.

With this configuration, a distance from the bent area to the exhaust gas sensor can be ensured. Accordingly, the exhaust air is easily led to the exhaust gas sensor through the bent portion, and a bend of the bent portion can be expanded, resulting in good exhaust efficiency.

Figure list

• [ 1 ] 1 Fig. 13 is a right side view of a motorcycle according to a first embodiment of the present invention.
• [ 2 ] 2 Fig. 13 is a perspective view of an exhaust device viewed from the right side.
• [ 3 ] 3 Fig. 13 is an exploded perspective view of a portion of a merging pipe in the exhaust device.
• [ 4th ] 4th Fig. 13 is a view of a merge area viewed from a downstream side.
• [ 5 ] 5 FIG. 12 is a cross-sectional view taken along line VV of FIG 2 was created.
• [ 6th ] 6th FIG. 6 is a cross-sectional view taken along line VI-VI of FIG 2 was created.
• [ 7th ] 7th Fig. 3 is a right side view of the merge area and tube.
• [ 8th ] 8th Fig. 13 is a view of the merging area and an exhaust gas sensor as viewed in an axis direction of the polygonal pipe areas from the downstream side.
• [ 9 ] 9 Fig. 13 is a view of the merging portion and the exhaust gas sensor as viewed in an axis direction of an axis of a circular pipe from the downstream side.
• [ 10 ] 10 Fig. 13 is a view of the merging portion and the exhaust gas sensor as viewed in an axis direction of an axis of the circular pipe from the downstream side.
• [ 11 ] 11 Fig. 13 is a right side view illustrating a structure of a lower portion of the motorcycle and the peripheral portion thereof.
• [ 12th ] 12th Fig. 13 is a front view of the structure of the lower portion of the engine and the peripheral portion thereof as viewed from a front of the vehicle.
• [ 13 ] 13 FIG. 13 is a cross-sectional view taken along line XIII-XIII of FIG 11 was created.
• [ 14th ] 14th Fig. 13 is a view of a merging portion and an exhaust gas sensor in an axis direction of the polygonal pipe portions viewed from a downstream side according to a second embodiment.

[Description of the embodiments]

In the following, embodiments of the present invention will be described with reference to the drawings. In the description, descriptions of directions such as front and rear, left and right, and up and down are identical to directions with respect to a vehicle body unless descriptions are specifically given. A reference character FR shown in each drawing indicates a front of the vehicle body, a reference character UP indicates a top of the vehicle body, and a reference character LH indicates a left side of the vehicle body.

[First embodiment]

[ 1 ] 1 Figure 13 is a right side view of a motorcycle 1 according to a first embodiment of the present invention.

The motorcycle 1 is a vehicle that has an engine 11 as a drive unit from a vehicle body frame 10 is held, a front fork 12th steerable from a front end of the body frame 10 is held, and a swing arm 13 on a rear portion of the vehicle body frame 10 is arranged. The front fork 12th steerably holds a front wheel 2 . The swing arm 13 holds a rear wheel 3 (Wheel).

The motorcycle 1 is a saddle seat vehicle that has a seat 14th on which a driver sits astride. The seat 14th is at a rear portion of the vehicle body frame 10 arranged.

The vehicle body frame 10 has a head pipe 15th , a pair of left and right main frames 16 , a pair of left and right downward frames 17th and a pair of left and right lower frames 18th on. The head pipe 15th is at the front end of the vehicle body frame 10 arranged. The pair of left and right main frames 16 runs from the head pipe 15th backwards and downwards. The pair of left and right downward main frames 17th runs from the head pipe 15th downward. The pair of left and right lower frames 18th runs from rear ends of the downwardly extending frames 17th to the rear and is the main frame with the lower end areas 16 connected.

The vehicle body frame 10 also has a pair of left and right seat frames 19th on that of the main frame 16 run backwards. The main frame 16 have the lower end areas where pivot areas 20th who have favourited the swing arm 13 hold, are arranged.

In detail, the lower end areas of the frames running downwards bend 17th backwards and run backwards. The lower frame 18th have front end regions that coincide with rear end regions of the downwardly extending frames 17th through welding areas 18a are combined, which are arranged at these front end portions. The lower frame 18th have areas running backwards 18b and areas running upwards 18c on. The backward areas 18b run under the engine 11 going through to the rear. The areas running upwards 18c extend from the rear ends of the rearward regions 18b backwards and upwards and are with the seat frame 19th connected. The main frame 16 have lower ends that have intermediate regions in a vertical direction of the upwardly extending regions 18c are connected.

The front fork 12th becomes rotatable from the body frame 10 via a steering shaft (not shown) which is held in the head tube 15th is used. The front fork 12th has an upper end area on which a handlebar 22nd is arranged for steering. The front wheel 2 becomes rotatable from an axis 2a held at a lower end of the front fork 12th is held.

The swing arm 13 becomes pivotable by a pivot shaft 23 held by left and right swivel ranges 20th is held. The swivel shaft 23 extends horizontally in a vehicle width direction. The swing arm 13 has a front end portion pivotable from the pivot shaft 23 is held and swings vertically in the center of the pivot shaft 23 .

The rear wheel 3 becomes rotatable from an axis 3a held at a rear end portion of the swing arm 13 is held.

The motorcycle 1 has a rear suspension 24 on that between the rear end of the swing arm 13 and the seat frame 19th bridged.

The motor 11 is on the back of the frame running downwards 17th and between the main frames 16 and the lower frame 18th arranged and on the body frame 10 attached.

The motor 11 has a crankcase 31 and a cylinder area 32 on. The crankcase 31 holds a crankshaft 30th that is horizontal in the vehicle width direction (left and right directions). The cylinder area 32 extends from a top of a front portion of the crankcase 31 up. The cylinder area 32 has a cylinder 32a , a cylinder head 32b and a cylinder head cover 32c in that order from the side of the crankcase 31 from to.

A piston 32d that is in the cylinder 32a reciprocated, is with the crankshaft 30th connected via a connecting rod (not shown).

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

The motor 11 is a multi-cylinder in-line engine in which a large number of cylinders in which pistons 32d are arranged side by side in an axis direction (vehicle width direction) of the crankshaft 30th are arranged. In this first embodiment is a motor 11 an in-line four-cylinder engine and four cylinders are side by side in the axial direction of the crankshaft 30th arranged.

Overall, the engine 11 a first cylinder, a second cylinder, a third cylinder, and a fourth cylinder in order from one side (vehicle left side) in the vehicle width direction. In 1 an outer surface of the fourth cylinder is shown.

The crankcase 31 has a rear area that contains a gearbox area 31a is, which receives a transmission (not shown).

The gearbox area 31a is with a coupling device 33 provided that the disconnection and the connection of the rotation of the transmission between the crankshaft 30th and the transmission described above shifts. The coupling device 33 is a friction clutch device and is supported by a clutch shaft 34 kept that in the gearbox area 31a is arranged. The coupling shaft 34 is parallel to the crankshaft 30th on a rear side of the crankshaft 30th arranged.

The output from the engine 11 is attached to the rear wheel 3 via a drive chain 35 transmitted, which is an output shaft of the transmission described above with the rear wheel 3 connects.

The motor 11 has an exhaust device 36 on that with exhaust ports on a front of the cylinder head 32b connected is.

The motor 11 has an inlet device 37 on, those with inlet ports on a rear of the cylinder head 32b connected is.

A fuel tank 38 is the main frame at the top 16 and between the head pipe 15th and the seat 14th arranged. The seat 14th is at the top of the seat frame 19th arranged.

The motorcycle 1 has a front bezel 39 and side panels 40 on. The front fairing 39 covers an upper area of the front fork 12th and the head pipe 15th from the front and the left and right sides. The side panels 40 cover a lower side area of the seat 14th from the side.

The front fork 12th holds a front fender 41 .

The left and right pan areas 20th have backs on which a pair of left and right kicks 42 on which a driver's feet from seat 14th are separated, are arranged.

The motorcycle 1 has lateral sides at the rear where a pair of left and right luggage racks 43 are attached.

2 Fig. 3 is a perspective view of the exhaust device 36 viewed from a right side.

With reference to 1 and 2 has the exhaust device 36 on a first exhaust pipe 51 (Exhaust pipe, two adjacent exhaust pipes), a second exhaust pipe 52 (Exhaust pipe, exhaust pipe positioned on a second surface side), a third exhaust pipe 53 (Exhaust pipe, exhaust pipe positioned on a second surface side) and a fourth exhaust pipe 54 (Exhaust pipe, two adjacent exhaust pipes). The first exhaust pipe 51 is with an exhaust port of the above-described first cylinder in the cylinder head 32b connected. The second exhaust pipe 52 is with an exhaust port of the above-described second cylinder in the cylinder head 32b connected. The third exhaust pipe 53 is with an exhaust port of the above-described third cylinder in the cylinder head 32b connected. The fourth exhaust pipe 54 is with an exhaust port of the fourth cylinder described above in the cylinder head 32b connected.

The exhaust device 36 also has a merging tube 55 , a catalyst device 56 , a connecting pipe 57 and a muffler 58 on ( 1 ). The merging pipe 55 is with end regions on a downstream side of the first exhaust pipe 51 , the second exhaust pipe 52 , the third exhaust pipe 53 and the fourth exhaust pipe 54 connected. The catalyst device 56 is with a downstream end of the merging tube 55 connected. The connecting pipe 57 extends from a downstream end of the catalyst device 56 . The muffler 58 is with a downstream end of the connecting pipe 57 connected.

In addition, the exhaust device 36 an exhaust gas sensor 59 on, the exhaust air captured in the exhaust device 36 flows.

The one in the first exhaust pipe 51 , the second exhaust pipe 52 , the third exhaust pipe 53 and the fourth exhaust pipe 54 flowing exhaust air flows through the merging pipe in order 55 , the catalyst device 56 , the connecting pipe 57 and the muffler 58 and gets from the muffler 58 diverted to the outside.

The first exhaust pipe 51 , the second exhaust pipe 52 , the third exhaust pipe 53 and the fourth exhaust pipe 54 have motor connection areas 51a , 52a , 53a and 54a at upstream ends that connect to the respective exhaust gas openings of the cylinder head 32b are connected. That is, the first exhaust pipe 51 , the second exhaust pipe 52 , the third exhaust pipe 53 and the fourth exhaust pipe 54 are arranged side by side in the vehicle width direction in an order from one side (left vehicle side) in the vehicle width direction.

The first exhaust pipe 51 , the second exhaust pipe 52 , the third exhaust pipe 53 and the fourth exhaust pipe 54 point downward areas 51b , 52b , 53b and 54b on that in front of the engine 11 from the motor connection areas 51a , 52a , 53a and 54a be passed and run down. The downward sloping areas 51b , 52b , 53b and 54b have lower end portions that bend rearward and on a lower side of the front portion of the crankcase 31 are positioned.

3 Figure 13 is an exploded perspective view of a portion of the merging tube 55 in the exhaust device 36 .

In the downward sloping areas 51b , 52b , 53b and 54b , are polygonal pipe areas 51c , 52c , 53c and 54c (Polygonal pipes), which have polygonal cross-sectional areas, each arranged at end portions on a downstream side in an exhaust air flow.

The exhaust device 36 has a merge area 60 where the polygonal pipe areas 51c , 52c , 53c and 54c are combined in a bundle. The merge area 60 is on the lower side of the front area of the crankcase 31 positioned and runs in a vehicle longitudinal direction.

4th Figure 3 is a view of the merge area 60 viewed from a downstream side (rear). In 4th is a circular tube 80 and a circular tube 81 which are described below are not shown.

The polygonal pipe area 51c of the first exhaust pipe 51 is a pipe that has a pentagonal cross-sectional area. In detail is the polygonal pipe area 51c by a radial expansion of the end area of the downwardly extending area 51b formed to form a pentagonal portion and an outer tube 51d , which has a pentagonal cross-sectional area, to fit on an outer periphery of the pentagonal portion. The first exhaust pipe 51 is the pipe having a circular cross-sectional area on an upstream side with respect to the polygonal pipe area 51c Has.

The polygonal pipe area 52c of the second exhaust pipe 52 is a tube that has a square cross-sectional area. The polygonal pipe area 52c is through a radial expansion of the end area of the downwardly extending area 52b formed to form a square section and an outer tube 52d , which has a square cross-sectional area, to fit on an outer periphery of the square portion. The second exhaust pipe 52 is the pipe having a circular cross-sectional area on an upstream side with respect to the polygonal pipe area 52c Has.

The polygonal pipe area 53c of the third exhaust pipe 53 is a pipe that has a pentagonal cross-sectional area. The polygonal pipe area 53c is through a radial expansion of the end area of the downwardly extending area 53b formed to form a pentagonal portion and an outer tube 53d , which has a pentagonal cross-sectional area, to fit on an outer periphery of the pentagonal portion. The third exhaust pipe 53 is the pipe having a circular cross-sectional area on an upstream side with respect to the polygonal pipe area 53c Has.

The polygonal pipe area 54c of the fourth exhaust pipe 54 is a tube that has a square cross-sectional area. The polygonal pipe area 54c is through a radial expansion of the end area of the downwardly extending area 54b formed to form a square section and an outer tube 54d , which has a square cross-sectional area, to fit on an outer periphery of the square portion. The fourth exhaust pipe 54 is the pipe having a circular cross-sectional area on an upstream side with respect to the polygonal pipe area 54c Has.

In detail, as in the in 4th viewed in the axial direction shown, the polygonal tube area 51c of the first exhaust pipe 51 a lower surface 61a , a pair of side faces 61b and 61c and a pair of top surfaces 61d and 61e on. The pair of side faces 61b and 61c is upright from both ends of the lower surface 61a arranged. The pair of upper surfaces 61d and 61e runs from ends of the side surfaces 61b and 61c in order to approach each other in such a way as to be at a vertex area 61f to cut. This is the polygonal pipe area 51c of the first exhaust pipe 51 formed in a pentagon.

The crown area 61f is a vertex that is opposite to the lower surface 61a is. The side faces 61b and 61c increase a mutual distance when approaching the side of the apex area 61f from the lower face 61a out.

The polygonal pipe area 51c is the symmetrical pentagon that is on a center line 61g a bisector of the lower surface 61a is arranged centrally.

The polygonal pipe area 53c of the third exhaust pipe 53 has the same shape as the polygonal pipe area 51c and points to a lower surface 63a , a pair of side faces 63b and 63c and a pair of top surfaces 63d and 63e that are at the crown of the head 63f cut, whereby it is formed as a pentagon.

The polygonal pipe area 51c and the polygonal pipe area 53c are arranged so that the lower surface 61a and the lower surface 63a lie against each other. The polygonal pipe area 51c and the polygonal pipe area 53c are symmetrically centered on an axis of symmetry 65 arranged by a contact surface between the lower surface 61a and the lower surface 63a goes through and runs parallel to the contact surface. The axis of symmetry 65 is perpendicular to the center line 61g .

The center line 61g of the polygonal pipe area 51c corresponds to a center line 63g of the polygonal pipe area 53c .

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

The polygonal pipe area 52c of the second exhaust pipe 52 points to a lower surface 62a , a lower surface 62b , an upper surface 62c and a top surface 62d . The lower face 62a lies on the side face 61b at. The lower face 62b lies on the side face 63b at. The upper face 62c is to the lower surface 62a opposite. The upper face 62d is to the lower surface 62b opposite. This is the polygonal pipe area 52c of the second exhaust pipe 52 designed as a square.

The polygonal pipe area 52c is the square that has a symmetrical shape centered on the axis of symmetry 65 Has. An apex area 62e on which the lower surface 62a and the lower surface 62b cut, and a parting area 62f on which the upper surface 62c and the top surface 62d intersect are on the axis of symmetry 65 positioned.

The polygonal pipe area 54c of the fourth exhaust pipe 54 has a shape that corresponds to the polygonal pipe area 52c of the second exhaust pipe 52 is identical. The polygonal pipe area 54c and the polygonal pipe area 52c are centered on the center line 61g symmetrically arranged.

The polygonal pipe area 54c of the fourth exhaust pipe 54 points to a lower surface 64a , a lower surface 64b , an upper surface 64c and a top surface 64d on. The lower face 64a lies on the side face 61c at. The lower face 64b lies on the side face 63c at. The upper face 64c is to the lower surface 64a opposite. The upper face 64d is to the lower surface 64b opposite. This is the polygonal pipe area 54c of the first exhaust pipe 54 formed in a square.

The polygonal pipe area 54c is the square that has a symmetrical shape centered on the axis of symmetry 65 Has. An apex area 64e on which the lower surface 64a and the top surface 64b cut, and a parting area 64f on which the upper surface 64c and the top surface 64d intersect are on the axis of symmetry 65 positioned.

The merge area 60 is an area where the four of the polygonal pipe area 51c , the polygonal pipe area 52c , the polygonal pipe area 53c and the polygonal pipe area 54c are arranged in a bundle, so that an outer shape of the merging area 60 in an axis direction of the merging area 60 considered a parallelogram.

In detail are the polygonal pipe area 51c and the polygonal pipe area 54c in a state in which they abut against each other, arranged side by side on the left and right.

The polygonal pipe area 52c and the polygonal pipe area 53c are in a state in which they are in contact with each other, under the polygonal pipe area 51c and the polygonal pipe area 54c arranged.

The polygonal pipe area 51c and the polygonal pipe area 54c are upper exhaust pipes that are above the polygonal pipe area 52c and the polygonal pipe area 53c are arranged. The polygonal pipe area 52c and the polygonal pipe area 53c are lower exhaust pipes that are below the polygonal pipe area 51c and the polygonal pipe area 54c are arranged.

An outer peripheral surface 66 the merge area 60 is through the top surface 61e , the upper surface 64d , the upper surface 64c , the upper surface 63e , the upper surface 63d , the upper surface 62c , the upper surface 62d and the top surface 61d arranged. An outer shape of this outer peripheral surface 66 is a parallelogram. In detail is the outer shape of the outer peripheral surface 66 a diamond shape with the axis of symmetry 65 and the center line 61g diagonal lines are. If the axis of symmetry 65 and the center line 61g has been regarded as the diagonal lines of this diamond shape is the axis of symmetry 65 the diagonal line that is longer than the center line 61g is. The merge area 60 is arranged so that the axis of symmetry 65 is an oblique line that is inclined so as to be positioned upward as a head portion in the vehicle width direction.

Since the outer peripheral surface 66 which has a diamond shape are a top surface 66a and a lower surface 66b the outer peripheral surface 66 parallel, and an inner surface 66c and an outer surface 66d the outer peripheral surface 66 are parallel.

The upper face 66a and the lower surface 66b are in the axial direction of the merge area 60 viewed approximately horizontally and approximately parallel to a floor.

In the axial direction of the merge area 60 considered are the inner surface 66c and the outer surface 66d inclined surfaces that are inclined so as to be positioned upward as an outer area in the vehicle width direction.

In the merge area 60 is the polygonal pipe area 51c on the three exhaust pipes of the polygonal pipe area 52c , the polygonal pipe area 53c and the polygonal pipe area 54c at.

In the merge area 60 is the polygonal pipe area 52c on the two exhaust pipes of the polygonal pipe area 51c and the polygonal pipe area 53c at.

In the merge area 60 is the polygonal pipe area 53c on the three exhaust pipes of the polygonal pipe area 51c , the polygonal pipe area 52c and the polygonal pipe area 54c at.

In the merge area 60 is the polygonal pipe area 54c on the two exhaust pipes of the polygonal pipe area 51c and the polygonal pipe area 53c at.

That is, in the merge area 60 are respective polygonal pipe areas 51c , 52c , 53c and 54c arranged with the four pipes in a bundle so as to be in contact with at least two adjacent exhaust pipes.

5 FIG. 12 is a cross-sectional view taken along line VV of FIG 2 was created. 6th FIG. 6 is a sectional view taken along line VI-VI of FIG 2 was created. 7th Figure 3 is a right side view of the merge area 60 and the merging pipe 55 . In 7th is a lower half body described below 69 not shown.

With reference to 1 to 7th is the merging pipe 55 a pipe running in the vehicle longitudinal direction under the crankcase 31 runs. The merging pipe 55 has an upstream end 55a at a front end side that is connected to the merging area 60 connected, and a downstream end 55b on a rear end side that is connected to the catalyst device 56 connected is.

The merging pipe 55 is formed in a tubular shape having an upper half body 68 and the lower half body 69 combined. The upper half body 68 and the lower half body 69 have plate shapes and have been divided vertically.

The merging pipe 55 is with the merge area 60 by the presence of an inner peripheral surface of the forward end 55a connected, that on the outer peripheral surface 66 the merge area 60 is fitted.

The merging pipe 55 covers an entire circumference of the outer peripheral surface 66 the merge area 60 . The merging pipe 55 is according to the outer peripheral surface 66 the merge area 60 educated. In an axial direction of the merging pipe 55 is an outer shape of the merging pipe 55 a diamond shape similar to the outer peripheral surface 66 .

In detail, as in 6th shown, has the merging tube 55 a first surface 71 , a second face 72 , a third surface 73 and a fourth surface 74 on. As in the axis direction of the merging pipe 55 considered, connects the first surface 71 the polygonal pipe area 51c and the polygonal pipe area 54c that are adjacent to each other in a left and right direction. The second face 72 connects the polygonal pipe area 52c and the polygonal pipe area 53c that are adjacent to each other in the left and right directions. The third area 73 connects the polygonal pipe area 51c and the polygonal pipe area 52c that are adjacent to each other in a vertical direction. The fourth area 74 connects the polygonal pipe area 54c and the polygonal pipe area 53c that are adjacent to each other in the vertical direction.

The second face 72 is a lower surface area of the diamond-shaped merging tube 55 and roughly horizontal. In detail is the second area 72 slightly inclined so as to be positioned as a head area downwards in the direction of the vehicle width. The second face 72 covers the lower surface 66b the outer peripheral surface 66 .

The first face 71 is an upper surface portion of the diamond-shaped merging pipe 55 and parallel to the second surface 72 . The first face 71 covers the upper surface 66a the outer peripheral surface 66 .

The fourth area 74 is an outer surface portion of the diamond-shaped merging pipe 55 and an inclined surface that is in the vehicle width direction in a front view of the motorcycle 1 is inclined outward and upward when viewed in an upright state. The fourth area 74 covers the upper surface 66d the outer peripheral surface 66 .

The third area 73 is an inner surface portion of the diamond-shaped merging pipe 55 and parallel to the fourth surface 74 . The third area 73 covers the inner surface 66c the outer peripheral surface 66 .

The first face 71 and the third face 73 are on the upper half body 68 arranged and the second surface 72 and the fourth area 74 are on the lower half body 69 arranged.

With reference to 5 and 7th has the merging tube 55 a rear area on which a narrowed area 75 is arranged. The narrowed area 75 is a range in which a diameter of the merging pipe 55 is narrowed. An inside diameter of the narrowed area 75 is smaller than an inside diameter of the upstream end 55a of the merging pipe 55 and an inside diameter of the downstream end 55b of the merging pipe 55 .

The catalyst device 56 has an outer tube portion 56a and a catalyst body (not shown) placed in the outer tube portion 56a is recorded. The downstream end 55b of the merging pipe 55 is at an upstream end of the outer pipe section 56a the catalyst device 56 fitted to with the catalytic device 56 to be connected. The downstream end 55b is in an axis direction according to a shape of the outer tube portion 56a formed in a circular shape when viewed.

The first face 71 of the merging pipe 55 is with a sensor attachment area 76 provided on which the exhaust gas sensor 59 is appropriate. The sensor attachment area 56 is a tubular area passing through the first face 71 in the vertical direction.

With reference to 5 indicates the exhaust gas sensor 59 has a bar shape and has a detection area 59a that detects an oxygen concentration in the exhaust air at a distal end portion. The exhaust gas sensor 59 has a base end portion on which an electric cable 59b connected. The electric cable 59b transmits a detection result of the detection area 59a to a control unit (not shown) of the motorcycle 1 .

The exhaust gas sensor 59 is in the sensor attachment area 56 inserted from an outside, and the detection area 59a is in the merging pipe 55 arranged. The exhaust gas sensor 59 is arranged to be inclined so that an axis 59c of the exhaust gas sensor 59 in the axis direction of the merging pipe 55 is oriented outward and upward when viewed in the vehicle width direction.

The exhaust gas sensor 59 is downstream of the narrowed area 75 on the first face 71 and at the end on the downstream side of the merging pipe 55 arranged.

With reference to 6th is the merge area 60 by welding each of the lower surface 61a and the lower surface 63a , the side face 61b and the lower surface 62a , the side face 61c and the lower surface 64a , the lower surface 64b and the side face 63c and the side face 63b and the lower surface 62b integrated.

In addition, is the merging pipe 55 roughly over the entire circumference of the upstream end 55a on the outer peripheral surface 66 the merge area 60 welded.

The polygonal pipe area 51c and the polygonal pipe area 53c are arranged so that they are positioned diagonally next to each other. The polygonal pipe area 51c and the polygonal pipe area 53c have the same shape and are formed into an identical shape as a pentagon by plastic deformation. In view of this, the mold can be used in common to manufacture the polygonal pipe section 51c and the polygonal pipe area 53c to simplify.

The polygonal pipe area 52c and the polygonal pipe area 54c are arranged so that they are positioned diagonally next to each other. The polygonal pipe area 52c and the polygonal pipe area 54c have the same shape and are formed as a square by plastic deformation with an identical shape. In view of this, the mold can be used in common to manufacture the polygonal pipe section 52c and the polygonal pipe area 54c to simplify.

8th Figure 3 is a view of the merge area 60 and the exhaust gas sensor 59 in the axial direction of the polygonal pipe area 51c and the polygonal pipe area 54c viewed from the downstream side. In 8th is the merging pipe 55 represented as a virtual line.

With reference to 3 and 5 to 8th are in the merge area 60 the polygonal pipe area 52c and the polygonal pipe area 53c that is on the side of the second face 72 are positioned, each with circular tubes 80 and 81 intended. The circular pipes 80 and 81 extend to a downstream side in the direction of an inner side of the merging pipe 55 . The circular pipes 80 and 81 have circular cross-sectional areas.

The circular tube 80 is in the polygonal pipe area 52c inserted from the downstream side, to an inner peripheral area of the area on the upstream side with respect to the polygonal pipe area 52c in the downward area 52b fitted and on the downward sloping area 52b attached by welding.

With reference to 7th and 8th is the circular tube 80 in the vehicle width direction and on a lower side with respect to the detection area 59a of the exhaust gas sensor 59 positioned. The circular tube 80 is also on the upstream side with regard to the detection area 59a positioned.

The circular tube 80 has a curved area 80b which is so curved that an opening 80a at a downstream end of the circular tube 80 the detection area 59a is facing. That is, the bent area 80b bends the circular tube 80 outward and upward in the vehicle width direction.

As in 7th shown overlaps an axis 80c of the circular tube 80 that from the opening 80a runs to the downstream side, the detection area 59a .

The circular tube 81 is in the polygonal pipe area 53c inserted from the downstream side, to an inner peripheral area of the area on the upstream side with respect to the polygonal pipe area 53c in the downward area 53b fitted and on the downward sloping area 53b attached by welding.

With reference to 7th and 8th is the circular tube 81 on the upstream side and a lower side with respect to the detection area 59a of the exhaust gas sensor 59 positioned.

The circular tube 81 has a curved area 81b which is so curved that an opening 81a at a downstream end of the circular tube 81 the detection area 59a is facing. That is, the bent area 81b bends the circular tube 81 up.

As in 7th shown overlaps an axis 81c of the circular tube 81 that from the opening 81a runs to the downstream side, the detection area 59a .

As in 8th shown, the detection area overlaps 59a if the merge area 60 and the exhaust gas sensor 59 in the axial direction of the polygonal pipe area 51c and the polygonal pipe area 54c viewed from the downstream side, an opening 51e at a downstream end of the polygonal pipe area 51c and an opening 54e at a downstream end of the polygonal pipe area 54c .

This causes exhaust air to flow from the polygonal pipe area 51c to the merging pipe 55 flows, and exhaust air coming from the polygonal pipe area 54c to the merge area 55 flows, directly in contact with the detection area 59a comes. In view of this, exhaust air can flow out of the first exhaust pipe 51 and the fourth exhaust pipe 54 from the exhaust gas sensor 59 can be recorded with high accuracy.

In addition, if the exhaust sensor 59 in the axial direction of the polygonal pipe area 51c and the polygonal pipe area 54c viewed from the downstream side is the detection area 59a on an upper side with respect to the polygonal pipe area 52c and the polygonal pipe area 53c positions and does not overlap the polygonal pipe area 52c nor the polygonal pipe area 53c . Given this, it is not necessary to change the coverage area 59a in a special way to extend and a general exhaust gas sensor 59 can be used.

9 Figure 3 is a view of the merge area 60 and the exhaust gas sensor 59 in an axis direction of the axis 80c of the circular tube 80 viewed from the downstream side.

As in 9 shown overlaps in the axis direction of the axis 80c of the circular tube 80 looks at the detection area 59a the opening 80a of the circular tube 80 in the polygonal pipe area 52c .

This causes air to flow from the polygonal pipe area 52c through the circular tube 80 to the merging pipe 55 flows, directly in contact with the detection area 59a comes. In view of this, exhaust air can flow from the second exhaust pipe 52 from the exhaust gas sensor 59 can be recorded with high accuracy.

10 is a view of the merge area 60 and the exhaust gas sensor 59 in an axis direction of the axis 81c of the circular tube 81 viewed from the downstream side.

As in 10 shown, the detection area overlaps 59a in the axis direction of the axis 81c of the circular tube 81 looks at the opening 81a of the circular tube 81 in the polygonal pipe area 53c .

This causes exhaust air to flow from the polygonal pipe area 53c through the circular tube 81 to the merging pipe 55 flows, directly in contact with the detection area 59a comes. In view of this, the third exhaust pipe 53 from the exhaust gas sensor 59 can be recorded with high accuracy.

That is, in this first embodiment, the exhaust air comes from the first exhaust pipe 51 , the exhaust air from the second exhaust pipe 52 , the exhaust air from the third exhaust pipe 53 and the exhaust air from the fourth exhaust pipe 54 directly to the detection area 59a in contact. In view of this, the exhaust air can be passed through the exhaust gas sensor with high accuracy 59 are recorded.

The exhaust air coming from the merging area 60 to the merging pipe 55 flows, flows through the narrowed area 75 to become a merged stream, and then comes with the exhaust gas sensor 59 downstream of the narrowed area 75 in contact. In view of this, the exhaust air can be efficiently communicated with the exhaust gas sensor 59 be brought into contact, and the exhaust air can with high accuracy from the exhaust gas sensor 59 are recorded.

They also have the circular tube 80 and the circular tube 81 circular cross-sectional areas and thus they are processed simply by bending in comparison to, for example, a pipe which has a polygonal cross-sectional area. In view of this, the curved area 80b the curved area 81b can be formed in a simple manner.

As in 8th shown are the polygonal pipe area 51c and the polygonal pipe area 54c through a contact surface 86 between the side face 61c and the lower surface 64a to each other.

The polygonal pipe area 52c and the polygonal pipe area 53c lie through a contact surface 87 between the lower surface 62b and the side face 63b to each other.

The contact area 86 and the contact area 87 are parallel to each other. The contact area 86 and the contact area 87 extend in the vertical direction in the axis direction of the merging pipe 55 and are in a direction perpendicular to the first surface 71 of the merging pipe 55 arranged.

In addition, there are the polygonal pipe area 52c and the polygonal pipe area 51c through a contact surface 88 between the lower surface 62a and the side face 61b to each other.

The polygonal pipe area 53c and the polygonal pipe area 54c lie through a contact surface 89 between the lower surface 63c and the lower surface 64b to each other.

The contact area 88 and the contact area 89 are parallel to each other and are in a direction perpendicular to the fourth surface 74 of the merging pipe 55 in the axis direction of the merging pipe 55 viewed arranged.

11 Fig. 13 is a right side view showing a structure of a lower portion of the engine 11 and illustrates the scope thereof. 12th Fig. 13 is a front view of the structure of the lower portion of the engine 11 and the peripheral area thereof as viewed from a front of the vehicle. 13 FIG. 13 is a cross-sectional view taken along line XIII-XIII of FIG 11 was created.

With reference to 11 to 13 instructs the engine 11 an oil pan 83 on that at a bottom 31b of the crankshaft housing 31 is appropriate. The oil pan 83 collects engine oil 11 .

The oil pan 83 is arranged in a central area in the vehicle width direction and overlaps a center line C in the vehicle width direction of the motorcycle 1 . The center line C is a vertical line passing through a floor area 3b ( 12th ) of the rear wheel 3 with respect to the floor G in a state that the motorcycle 1 stands upright.

The oil pan 83 has attachment areas 83a on that at the bottom 31b of the crankshaft housing 31 fastened with screws and an oil storage area 83b regarding the mounting areas 83a bulges downward when viewed from the front.

The oil storage area 83b is arranged in the center area in the vehicle width direction and attachment areas 83a are left and right of the oil storage area, respectively 83b arranged.

The oil storage area 83b bulges out downwards and thus are on the oil pan 83 a pair of left and right relief areas 83c on the outer side of the oil storage area 83b and the lower sides of the attachment areas 83a educated. The recess areas 83c open downwards and to the outer lateral sides when viewed in the front view of the vehicle.

The oil pan 83 is formed approximately symmetrically in the middle of the center line C. Given that is a capability of the oil pan 83 to stand upright, good when the oil pan 83 while works such as maintenance is ordered, and works are simplified.

The merge area 60 and the merging tube 55 are positioned outward in the vehicle width direction with respect to the center line C and are offset outward in the vehicle width direction with respect to a center of the vehicle width.

In detail are the merge area 60 , the merging pipe 55 and a front end portion of the catalyst device 56 on one side of the recess areas 83c (right side) arranged in the vehicle width direction and overlap the oil storage area 83b in the vehicle width direction in a side view of the vehicle viewed from the outside. In addition is the muffler 58 ( 1 ) on a rear side of the catalyst device 56 and an outer lateral side of the rear wheel 3 arranged.

The merge area 60 and the merging tube 55 have top areas that are adjacent to the recess area 83c are arranged, and the merging area 60 and the merging tube 55 have lower regions that are on a lower side with respect to a lower surface 83d of the oil storage area 83b are positioned.

In addition, is the merging pipe 55 in the vehicle width direction with respect to the lower frame 18th disposed on the one side (right side) inside in the vehicle width direction and between the rearward portion 18b of the lower frame 18th and the oil storage area 83b arranged in the vehicle width direction.

With reference to 11 and 13 When viewed from the side of the vehicle, the rearward area overlaps 18b of the lower frame 18th on one side the upper area of the merging area 60 and the exhaust gas sensor 59 in the vehicle width direction from outside and covers the upper portion of the merging area 60 and the exhaust gas sensor 59 . Given this, the lower frame 18th the exhaust gas sensor 59 protect and can improve the appearance in a way that the exhaust gas sensor 59 through the lower frame 18th is hidden.

In addition is the exhaust gas sensor 59 offset to the rear with respect to the welding area 18a between the frame running downwards 17th and the lower frame 18th arranged. This can avoid the welding area 18a the arrangement of the exhaust gas sensor 59 bothers, and a degree of freedom in the arrangement of the exhaust gas sensor 59 is high.

In addition, as the exhaust gas sensor 59 on the first face 71 as the top area of the merging pipe 55 is arranged, the merging tube 55 the exhaust gas sensor 59 protect from the bottom.

In addition is the exhaust gas sensor 59 from a top with the crankcase 31 covered. In view of this, the crankcase 31 the exhaust gas sensor 59 protect from the top

In addition, the pipe is circular 80 and the circular tube 81 in the polygonal pipe area 52c and the polygonal pipe area 53c arranged under the polygonal pipe area 51c and the polygonal pipe area 54c are arranged. This can be the focus of the merge area 60 lower.

The crankcase 31 has an outer surface on a lower portion on which a pressure sensor 84 on an upper side with respect to the exhaust gas sensor 59 and the rearward area 18b of the lower frame 18th is appropriate. The pressure sensor 84 detects an oil pressure in the crankcase 31 .

With reference to 6th and 12th is the second face 72 as the lower surface area of the diamond-shaped merging tube 55 in a state in which the motorcycle 1 stands upright, roughly parallel to the ground G. This can create a large distance between the second surface 72 and the floor G ensure that the lowest possible floor level of the motorcycle 1 can be slightly higher.

As in 12th shown shows the kick 42 a roll sensor area 42a that protrudes downwards. The slope sensor area 42a has a lower end region which is a first bottom region 42b that comes into contact with the ground G first when the motorcycle 1 left and right in a bank.

The first floor area 42b is outside in the vehicle direction and on an upper side with respect to the merging pipe 55 positioned.

In 12th is a straight line L1 shown. The straight line L1 connects the floor area 3b in a center of the rear wheel 3 with the first floor area 42b . In 12th is also a straight line L2 shown. The straight line L2 connects a lateral end area 3c of the rear wheel 3 with the first floor area 42b . The lateral end area 3c is a ground point between the rear wheel 3 and the floor G if the motorcycle 1 is banked to the left and right. The straight line L1 and the straight line L2 are inclined outward and upward in the vehicle width direction.

The fourth area 74 as the outer surface area of the merging pipe 55 is in the vehicle width direction with respect to the straight line L1 and the straight line L2 and roughly parallel to the straight line L2 arranged. In view of this, a distance between the floor G and the fourth surface 74 of the merging pipe 55 be ensured when the motorcycle 1 in connection when turning, and a large bank angle of the motorcycle 1 can be designed.

In 1 and 11 are a vertical line 34a and a vertical line 30a shown. The vertical line 34a gives a position in the vehicle width direction of the clutch shaft 34 at. The vertical line 30a gives a position in the vehicle longitudinal direction of the crankshaft 30th at.

The merging pipe 55 and the catalyst device 56 are running in one direction from front to back under the crankcase 31 arranged, and the catalyst device 56 is on a rear side of the merging pipe 55 positioned.

The exhaust gas sensor 59 on a first surface 71 of the merging pipe 55 is arranged is under the crankcase 31 and on a front side with respect to the coupling shaft 34 and on a rear side of the crankshaft 30th positioned. The exhaust gas sensor 59 is between the coupling shaft 34 and the crankshaft 30th positioned in the vehicle longitudinal direction.

As described above, according to the first embodiment to which the present invention is applied, the motorcycle has 1 on the engine 11 , the plurality of the first exhaust pipe 51 , the second exhaust pipe 52 , the third exhaust pipe 53 and the fourth exhaust pipe 54 , the merge area 60 and the exhaust gas sensor 59 . The plurality of the first exhaust pipe 51 , the second exhaust pipe 52 , the third exhaust pipe 53 and the fourth exhaust pipe 54 is with the engine 11 connected and at the merge area 60 merged. The merge area 60 is disposed outwardly in the vehicle width direction with respect to the center of the vehicle width. The respective exhaust pipes from the first exhaust pipe 51 , the second exhaust pipe 52 , the third exhaust pipe 53 and the fourth exhaust pipe 54 are arranged with at least three of the pipes in a bundle (four pipes in the first embodiment), so as with at least two adjacent exhaust pipes in the junction area 60 to be in contact. The merging pipe 55 which is the total extent of the merge area 60 covers, is arranged. The merging pipe 55 runs in the longitudinal direction of the vehicle. In the front view of the motorcycle 1 viewed in an upright state is a fourth surface 74 as the outer surface of the merging tube 55 the inclined surface inclined outward and upward in the vehicle width direction. The merging pipe 55 is with an exhaust gas sensor 59 intended. In an axial direction of the merging pipe 55 when viewed the merging tube 55 the first face 71 on the two adjacent ones from the first exhaust pipe 51 and fourth exhaust pipe 54 connects, and the second face 72 leading to the first face 71 is opposite. The exhaust gas sensor 59 is on the first face 71 appropriate. The curved area 80b and the curved area 81b facing towards the exhaust sensor 59 bend are at end regions on the downstream side of the second exhaust pipe 52 and the third exhaust pipe 53 on the side of the second face 72 positioned.

With this design are in the merging area 60 of the plurality of the first exhaust pipe 51 , the second exhaust pipe 52 , the third exhaust pipe 53 and the fourth exhaust pipe 54 at least three of the pipes arranged in a bundle so that the respective exhaust pipes are in contact with at least two adjacent exhaust pipes, and the exhaust gas sensor 59 is arranged. Accordingly, the first exhaust pipe 51 , the second exhaust pipe 52 , the third exhaust pipe 53 and the fourth exhaust pipe 54 and the exhaust gas sensor 59 can be arranged in a compact manner. In addition, since the fourth area 74 of the merging pipe 55 is the inclined surface inclined outward and upward in the vehicle width direction, a clearance may be between the merging pipe 55 and a floor G can be ensured when the motorcycle is on 1 banked and the great bank angle of the motorcycle 1 can be ensured. In addition, as the exhaust gas sensor 59 on the first face 71 of the merging pipe 55 is arranged, the exhaust air from the first exhaust pipe 51 and the fourth exhaust pipe 54 than the two tubes on the side of the first face 71 with high accuracy thanks to the exhaust gas sensor 59 are recorded. In addition, exhaust air can flow from the second exhaust pipe 52 and the third exhaust pipe 53 that is on the side of the second face 72 are positioned by the curved area 80b and the curved area 81b led to in the direction of the exhaust sensor 59 to be passed through. In view of this, even if an exhaust gas sensor 59 on the merging pipe 55 is arranged, the exhaust air can be detected with high accuracy.

In addition are the curved area 80b and the curved area 81b Areas where the circular pipe 80 and the circular tube 81 have curved circular cross-sectional areas.

In this design, a circular tube, which is relatively easily deformed, is bent to simply include the bent area 80b and the curved area 81b to be able to train.

In addition, the plurality of the first exhaust pipe 51 , the second exhaust pipe 52 , the third exhaust pipe 53 and the fourth exhaust pipe 54 with the four tubes arranged in a bundle, so that the outer shape of the merging tube 55 in the axial direction of the merging pipe 55 is considered roughly a parallelogram. The second face 72 than the lower surface area of the merging pipe 55 is arranged approximately parallel to the bottom G.

With this design, the first exhaust pipe 51 , the second exhaust pipe 52 , the third exhaust pipe 53 and the fourth exhaust pipe 54 be arranged in a compact manner in a bundle and a large distance between the lower surface area of the merging pipe 55 and the bottom G can be secured.

They also have the first exhaust pipe 51 , the second exhaust pipe 52 , the third exhaust pipe 53 and the fourth exhaust pipe 54 than the four pipes to be bundled, the polygonal pipe area 51c , the polygonal pipe area 52c , the polygonal pipe area 53c and the polygonal pipe area 54c in the merge area 60 on. The polygonal pipe area 51c , the polygonal pipe area 52c , the polygonal pipe area 53c and the polygonal pipe area 54c are the tubes, each of which has polygonal cross-sectional areas. The polygonal pipe area 51c and the polygonal pipe area 53c that are positioned diagonally next to each other have an identical cross-sectional shape. They also have the polygonal pipe area 52c and the polygonal pipe area 54c that are positioned diagonally next to each other have an identical cross-sectional shape.

In this design, as the polygonal pipe area 51c , the polygonal pipe area 52c , the polygonal pipe area 53c and the polygonal pipe area 54c are polygonal, the polygonal pipe area 51c , the polygonal pipe area 52c , the polygonal pipe area 53c and the polygonal pipe area 54c be tightly bundled, and the first exhaust pipe 51 , the second exhaust pipe 52 , the third exhaust pipe 54 and the fourth exhaust pipe 54 can be arranged in a compact manner. They also have the polygonal pipe area 51c and the polygonal pipe area 53c an identical cross-sectional shape and the polygonal tube area 52c and the polygonal pipe area 54c have an identical cross-sectional shape. Thus, the polygonal tubes can be easily formed.

In addition, the first exhaust pipe 51 , the second exhaust pipe 52 , the third exhaust pipe 53 and the fourth exhaust pipe 54 , a plurality of which are bundled, the tubes, the respective polygonal cross-sectional areas in the merging area 60 to have. The second exhaust pipe 52 and the third exhaust pipe 53 that is on the side of the second side face 72 are positioned are with the circular tube 80 and the circular tube 81 provided by the polygonal tube area 52c and the polygonal pipe area 53c into the merging pipe 55 run away. The curved area 80b and the curved area 81b are in the circular tube 80 and in the circular tube 81 arranged.

In this design, as the first exhaust pipe 51 , the second exhaust pipe 52 , the third exhaust pipe 53 and the fourth exhaust pipe 54 in the merge area 60 are polygonal, the first exhaust pipe can 51 , the second exhaust pipe 52 , the third exhaust pipe 53 and the fourth exhaust pipe 54 be tightly bundled, and the first exhaust pipe 51 , the second exhaust pipe 52 , the third exhaust pipe 53 and the fourth exhaust pipe 54 can be arranged in a compact manner. In addition, even if the merge area 60 formed by polygonal tubes, the bent area 80b and the curved area 81b simply on the circular tube 80 and the circular tube 81 going from the polygonal tubes into the merging tube 55 run, be trained.

In addition, the first is face 71 the upper surface area of the merging tube 55 . The second face 72 is the lower surface area of the merging tube 55 . The first exhaust pipe 51 , the second exhaust pipe 52 , the third exhaust pipe 53 and the fourth exhaust pipe 54 indicate the polygonal pipe area 51c and the polygonal pipe area 54c as a pair of the upper exhaust pipes, and the polygonal pipe portion 52c and the polygonal pipe area 53c than the lower exhaust pipes. The polygonal pipe area 51c and the polygonal pipe area 54c are side by side to the left and right in the merge area 60 arranged. The polygonal pipe area 52c and the polygonal pipe area 53c are under the upper exhaust pipes in the merging area 60 arranged. The circular tube 80 and the circular tube 81 are arranged on the lower exhaust pipes.

In this design, because the first surface 71 at which the exhaust gas sensor 59 is attached, the top portion of the merging tube 55 can be the merging pipe 55 the exhaust gas sensor 59 protect from an underside. Since, in addition, the circular tube 80 and the circular tube 81 are arranged in the lower exhaust pipes, a center of gravity can be lowered.

In addition, the merging tube 55 the narrowed area where a diameter is narrowed. The reinforcement element 59 is on the downstream side of the narrowed connection area 75 arranged in the exhaust air flow. The body frame 10 overlaps the exhaust gas sensor 59 in the vehicle width direction from the outside.

With this design, the exhaust air for the exhaust gas sensor 59 through the narrowed area 75 can be collected, and the exhaust air can with high accuracy from the exhaust gas sensor 59 are recorded. In addition, the body frame 10 the exhaust gas sensor 59 protect from the outside in the vehicle width direction.

The catalyst device 56 is also on the back of the merging tube 55 arranged. The exhaust gas sensor 59 is under the engine 11 and between the engine 11 and the crankshaft 30th of the motor 11 and the coupling shaft 34 Positioned viewed in the side view of the vehicle.

With this design, the exhaust gas sensor 59 and the catalyst device 56 be arranged in an efficient manner.

In addition, is the merging pipe 55 with only one exhaust gas sensor 59 intended.

With this design, the exhaust air can be passed through the only one exhaust gas sensor with high accuracy 59 are recorded.

In addition, the exhaust gas sensor 59 at the end region on a downstream side of the merging pipe 55 be arranged.

With this design, a distance from the bent area 80b and the curved area 81b to the exhaust gas sensor 59 be ensured. Accordingly, the exhaust air simply becomes the exhaust sensor 59 through the curved area 80b and the curved area 81b guided, and bends of the bent area 80b and the bent area 81b can be expanded, resulting in good exhaust gas efficiency.

In addition is the oil pan 83 on a lower portion of the engine 11 arranged. The oil pan 83 has a pair of left and right relief areas 83c that open downward and to outer lateral sides when viewed in a front view of the vehicle. The merging pipe 55 is at one of the recess areas 83c arranged.

With this design, the oil pan 83 correctly balanced left and right and the ability of the oil pan 83 Standing upright can be improved. In addition, by means of the recess area 83c the oil pan 83 the merging pipe 55 can be arranged in a compact manner.

[Second embodiment]

A second embodiment to which the present invention is based will now be described with reference to FIG 14th is applied. In this second embodiment are identical Reference numerals are used for areas similar to the above-described first embodiment, and the description thereof is omitted.

While in the first embodiment described above, it was described that the four of the polygonal pipe portion 51c , the polygonal pipe area 52c , the polygonal pipe area 53c and the polygonal pipe area 54c in a bundle in the merge area 60 are arranged, this second embodiment differs from the first embodiment described above in that the three of the polygonal tube portion 51c , the polygonal pipe area 53c and the polygonal pipe area 54c are bundled.

14th Fig. 13 is a view in the second embodiment of a merging area 260 and the exhaust gas sensor 59 in the axial direction of the polygonal pipe area 51c and the polygonal pipe area 54c viewed from the downstream side. In 14th is a merging pipe 255 represented as a virtual line.

In the second embodiment, a three-cylinder in-line engine is used in place of the engine 11 attached and an exhaust device 236 is connected to the engine.

The exhaust pipe 236 has the first exhaust pipe 51 , the third exhaust pipe 53 , the fourth exhaust pipe 54 , a merging pipe 255 , the catalyst device 56 ( 2 ), the connecting pipe 57 ( 2 ) and the muffler 58 ( 1 ) on. The merging pipe 255 is with the end regions on the downstream side of the first exhaust pipe 51 , the third exhaust pipe 53 and the fourth exhaust pipe 54 connected. The catalyst device 56 is with a downstream end of the merging tube 255 connected. The connecting pipe 57 extends from a downstream end of the catalyst device 56 out. The muffler 58 is with the downstream end of the connecting pipe 57 connected.

In addition, the exhaust device 236 the exhaust gas sensor 59 on.

That is, the exhaust device 236 has a structure that the second exhaust pipe 52 from the exhaust device 36 excludes the first embodiment described above.

The first exhaust pipe 51 , the third exhaust pipe 53 and the fourth exhaust pipe 54 are in the merge area 260 bundled.

The merge area 260 is an area where the three of the polygonal pipe area 51c , the polygonal pipe area 53c and the polygonal pipe area 54c are arranged in a bundle, so that an outer shape of the merging area 260 in an axis direction of the merging area 260 is viewed roughly as a triangle.

In detail are the polygonal pipe area 51c and the polygonal pipe area 54c in a state in which they abut against each other, arranged on the left and right.

The polygonal pipe area 53c is under the polygonal pipe area 51c and the polygonal pipe area 54c arranged, and arranged so as to be at the polygonal pipe area 51c and the polygonal pipe area 54c to lie on.

The polygonal pipe area 51c and the polygonal pipe area 54c are upper exhaust pipes that are above the polygonal pipe area 52c and the polygonal pipe area 53c are arranged. The polygonal pipe area 53c is the lower exhaust pipe that is below the polygonal pipe area 51c and the polygonal pipe area 54c is arranged.

An outer peripheral surface 266 of the collection area 260 is through the top surface 61e , the upper surface 64d , the upper surface 64c , the upper surface 63e , the upper surface 63d , the side face 63b , the side face 61b and the top surface 61d educated. An outer shape of this outer peripheral surface 266 is roughly a triangle.

The merge area 260 is arranged with an apex region of the triangle described above oriented downwards.

The outer peripheral surface 266 has the upper face 66a , a lower surface 266b , the outer surface 66d and an inner surface 266c to be formed in the approximate triangle.

The upper face 66a and the lower surface 266b are parallel. Since the merge area 260 is the triangle in which one vertex area is oriented downwards, is the lower surface 266b shorter than the upper surface in the vehicle width direction 66a in the axial direction of the merge area 260 considered.

In the merge area 260 is the polygonal pipe area 51c on the two exhaust pipes of the polygonal pipe area 53c and the polygonal pipe area 54c at.

In the merge area 260 is the polygonal pipe area 53c on the two exhaust pipes of the polygonal pipe area 51c and the polygonal pipe area 54c at.

In the merge area 260 is the polygonal pipe area 54c on the two exhaust pipes of the polygonal pipe area 51c and the polygonal pipe area 53c at.

That is, in the merge area 260 are respective polygonal pipe areas 51c , 53c and 54c arranged with the three pipes in a bundle so as to be in contact with at least two adjacent exhaust pipes.

The merging pipe 255 is with the merge area 260 by the presence of an inner peripheral surface at an upstream end of the merging tube 255 connected, that on the outer peripheral surface 266 of the collection area 260 is fitted.

The merging pipe 255 covers an entire circumference of the outer peripheral surface 266 the merge area 260 . The merging pipe 255 is according to the outer peripheral surface 266 the merge area 260 educated. In an axial direction of the merging pipe 255 is an outer shape of the merging pipe 255 an approximate triangular shape similar to the outer peripheral surface 266 .

In detail, the merging tube 255 the first face 71 , a second face 272 , a third surface 273 and the fourth area 74 on. As in the axis direction of the merging pipe 255 considered, connects the first surface 71 the polygonal pipe area 51c and the polygonal pipe area 54c that are adjacent to each other in a left and right direction. The second face 272 covers the lower surface 266b the merge area 260 from. The third area 273 covers the inner surface 266c the merge area 260 . The fourth area 74 connects the polygonal pipe area 54c and the polygonal pipe area 53c that are adjacent to each other in the vertical direction.

The second face 272 is a lower side portion of the approximately triangular merging pipe 255 and almost horizontally. In detail is the second area 272 slightly inclined so as to be positioned as a head area in the direction of the vehicle width downwards.

The first face 71 is an upper surface area of the roughly triangular merging pipe 255 and parallel to the second surface 272 . The first face 71 covers the upper surface 66a the outer peripheral surface 266 .

The fourth area 74 is an outer surface area of the approximately triangular merging pipe 255 and an inclined surface inclined outward and upward in the vehicle width direction when viewed in a front view. The fourth area 74 covers the upper surface 66d the outer peripheral surface 266 .

The third area 273 is an upper surface area of the roughly triangular merging pipe 255 and covers the inner surface 266c the outer peripheral surface 266 from.

On the first surface 71 of the merging pipe 255 is the exhaust gas sensor 59 according to a structure similar to that of the sensor mounting portion 76 ( 3 ) appropriate.

The polygonal pipe area 53c is like the lower exhaust pipe with the circular pipe 81 provided that the downstream side in the merging pipe 55 runs.

The merging pipe 255 has a narrowed area similar to the narrowed area 75 ( 7th ) of the first embodiment described above on the first surface 71 on. The exhaust gas sensor 59 is arranged on a rear side of this narrowed area.

The merging pipe 255 is at the recess area 83c (Fog. 13).

Exhaust air coming from the polygonal pipe area 51c to the merging pipe 255 flows, and exhaust air coming from the polygonal pipe area 54c to the merging pipe 255 flows, comes directly with the detection area 59a in contact. In view of this, exhaust air can flow out of the first exhaust pipe 51 and the fourth exhaust pipe 54 from the exhaust gas sensor 59 can be recorded with high accuracy.

Exhaust air coming from the polygonal pipe area 53c through the circular tube 81 to the merging pipe 255 flows is through the circular tube 81 guided so as to the detection area 59a to be aligned and comes directly with the detection area 59a in contact. In view of this, the third exhaust pipe 53 from the exhaust gas sensor 59 can be recorded with high accuracy.

According to the second embodiment, the motorcycle 1 the plurality of the first exhaust pipe 51 , the third exhaust pipe 53 and the fourth exhaust pipe 54 , the merge area 260 and the exhaust gas sensor 59 on. The multitude from the first exhaust pipe 51 , the third exhaust pipe 53 and the fourth exhaust pipe 54 is connected to the engine and at the merge area 260 merged. The merge area 260 is offset outward in the vehicle width direction with respect to the center of the vehicle width. The respective exhaust pipes from the first exhaust pipe 51 , the third exhaust pipe 53 and the fourth exhaust pipe 54 are arranged in a bundle with the three pipes, so as with two adjacent exhaust pipes in the junction area 260 to be in contact. The merging pipe 255 which is the total extent of the merge area 260 covers, is arranged. The manifold 255 runs in the longitudinal direction of the vehicle. In the front view of the motorcycle 1 viewed in an upright state is a fourth surface 74 as the outer surface of the manifold 255 the inclined surface inclined outward and upward in the vehicle width direction. The merging pipe 255 is with an exhaust gas sensor 59 intended. In an axial direction of the merging pipe 255 when viewed the merging tube 255 the first face 71 on the two adjacent ones from the first exhaust pipe 51 and fourth exhaust pipe 54 connects, and a second face 272 leading to the first face 71 is opposite. The exhaust gas sensor 59 is on the first face 71 appropriate. The curved area 81b pointing in the direction of the exhaust gas sensor 59 bends is at the end portion on the downstream side of the third exhaust pipe 53 on the side of the second face 272 positioned arranged.

With this design are in the merging area 260 the respective exhaust pipes from the first exhaust pipe 51 , the third exhaust pipe 53 and the fourth exhaust pipe 54 arranged with the three pipes in a bundle so as to be in contact with two adjacent exhaust pipes, and an exhaust gas sensor 59 is arranged. Accordingly, the first exhaust pipe 51 , the third exhaust pipe 53 and the fourth exhaust pipe 54 and the exhaust gas sensor 59 can be arranged in a compact manner. In addition, since the fourth area 74 of the merging pipe 255 is the inclined surface inclined outward and upward in the vehicle width direction, a clearance may be between the merging pipe 255 and a floor G can be ensured when motorcycle 1 banks, and a large bank angle of the motorcycle 1 can be ensured. In addition, as the exhaust gas sensor 59 on the first face 71 of the merging pipe 255 is arranged, the exhaust air from the two of the first exhaust pipe 51 and the fourth exhaust pipe 54 on the side of the first face 71 with high accuracy thanks to the exhaust gas sensor 59 are recorded. In addition, exhaust air can flow from the one on the second surface side 272 positioned third exhaust pipe 53 through the curved area 81b led to in the direction of the exhaust sensor 59 to be passed through. In view of this, even if an exhaust gas sensor 59 on the merging pipe 55 is arranged, the exhaust air can be detected with high accuracy.

It should be understood that the above-described first and second embodiments are set forth to illustrate an aspect to which the present invention is applied, and the present invention is not limited to the above-described first or second embodiment.

While it has been stated in the above-described first and second embodiments that the exhaust gas sensor 59 downstream with respect to the narrowed area 75 is arranged, the present invention is not limited thereto. The exhaust gas sensor 59 can at the narrowed area 75 be arranged.

In addition, while in the first and second embodiments it was stated that only one exhaust gas sensor 59 is arranged, the present invention is not limited thereto. Other exhaust gas sensors can be found on the merging pipes 55 and 255 can be added and arranged.

Moreover, while in the above-described first and second embodiments, one example of the motorcycle 1 When the saddle seat vehicle was set forth, the present invention is not limited thereto. The present invention is also applicable to a three-wheeled saddle seat vehicle having two front wheels or two rear wheels and a saddle seat vehicle having four or more wheels.

List of reference symbols

1

Motorcycle (saddle seat vehicle)

3

Rear wheel (wheel)

10

Body frame

11

engine

30th

crankshaft

34

Coupling shaft

51

First exhaust pipe (exhaust pipe, two adjacent exhaust pipes)

51c

Polygonal pipe area (polygonal pipe, upper exhaust pipe)

52

Second exhaust pipe (exhaust pipe, exhaust pipe positioned on a second surface side)

52c

Polygonal pipe area (polygonal pipe, lower exhaust pipe)

53

Third exhaust pipe (exhaust pipe, exhaust pipe positioned on a second surface side)

53c

Polygonal pipe area (polygonal pipe, lower exhaust pipe)

54

Fourth exhaust pipe (exhaust pipe, two adjacent exhaust pipes)

54c

Polygonal pipe area (polygonal pipe, upper exhaust pipe)

56

Catalyst device

55, 255

Merging pipe

59

Exhaust gas sensor

60, 260

Merge area

71

First surface (upper surface area)

72, 272

Second surface (lower surface area)

74

Fourth surface (outer surface)

75

Narrowed area

80

Circular tube (tube that has a circular cross-sectional area)

80b

Curved area

81

Circular tube (tube that has a circular cross-sectional area)

81b

Curved area

83

sump

83c

Recess area

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• JP 200383061 [0003]

Claims (12)

A saddle seat vehicle comprising: an engine (11); a plurality of exhaust pipes (51, 52, 53 and 54) connected to the engine (11); a merging area (60 and 260) where the plurality of exhaust pipes (51, 52, 53 and 54) are merged; and an exhaust gas sensor (59), characterized in that the merging area (60 and 260) is arranged offset outward in a vehicle width direction with respect to a center of a vehicle width, the respective exhaust pipes (51, 52, 53 and 54) with at least three of the pipes are arranged in a bundle so as to be in contact with at least the two adjacent exhaust pipes in the junction area (60 and 260), a junction tube (55 and 255) covering an entire circumference of the junction area (60 and 260) is arranged, wherein the merging pipe (55 and 255) extends in a vehicle longitudinal direction, when viewed in a front view of the saddle vehicle in an upright state, an outer surface (74) of the merging pipe (55 and 255) is an inclined surface that is inclined outward and upward in the vehicle width direction , the merging pipe (55 and 255) with the one exhaust gas sensor (59) is provided in an axial Viewed in the direction of the merging pipe (55 and 255), the merging pipe (55 and 255) has a first surface (71) which connects two adjacent exhaust pipes (51 and 54), and a second surface (72 and 272) which connects to the first surface (71) is opposite, and the exhaust gas sensor (59) is attached to the first surface (71), a bent portion (80b and 81b) that bends toward the exhaust gas sensor (59) at an end portion on a downstream side of the Exhaust pipe (52 and 53) positioned on the side of the second surface (72 and 272) is arranged. Saddle seat vehicle after Claim 1 wherein the bent portion (80b and 81b) is a portion where a pipe (80 and 81) having a circular cross-sectional area bends. Saddle seat vehicle after Claim 1 or 2 wherein the plurality of exhaust pipes (51, 52, 53 and 54) are arranged in a bundle with four of the pipes so that an outer shape of the merging pipe (55) becomes approximately a parallelogram when viewed in the axial direction of the merging pipe (55), and a lower surface area (72) of the merging pipe (55) is arranged approximately parallel to the base (G). Saddle seat vehicle after Claim 3 , wherein the exhaust pipes (51, 52, 53 and 54) are four pipes to be bundled, the pipes (51c, 52c, 53c and 54c) having respective polygonal cross-sectional areas in the junction area (60), and the polygonal pipes (51c, 52c, 53c and 54c), which are arranged diagonally positioned, have an identical cross-sectional shape. Saddle seat vehicle according to one of the Claims 1 to 4th wherein the exhaust pipes (51, 52, 53 and 54), a plurality of which are bundled, are pipes (51c, 52c, 53c, and 54c) having respective polygonal cross-sectional areas in the junction area (60 and 260), the exhaust pipe ( 52 and 53) positioned on the side of the second surface (72 and 272) is provided with a circular tube (80 and 81) extending from polygonal tubes (52c and 53c) into the merging tube (55 and 255) , and the bent portion (80b and 81b) is arranged in the circular tube (80 and 81). Saddle seat vehicle after Claim 5 , wherein the first surface (71) is an upper surface area of the merging pipe (55 and 255), and the second surface (72 and 272) is a lower surface area of the merging pipe (55 and 255), the exhaust pipes (51, 52, 53 and 54) have a pair of upper exhaust pipes (51 and 54), which are arranged side by side to the left and right in the junction area (60 and 260), and a lower exhaust pipe (52 and 53), which under the upper exhaust pipes (51 and 54) is arranged in the junction area (60 and 260), and the circular pipe (80 and 81) is arranged in the lower exhaust pipe (52 and 53). Saddle seat vehicle according to one of the Claims 1 to 5 wherein the first surface (71) is a surface area of the merging pipe (55 and 255). Saddle seat vehicle according to one of the Claims 1 to 7th wherein the confluence pipe (55 and 255) has a narrowed portion (75) in which a diameter is narrowed, and the exhaust gas sensor (59) at the narrowed portion (75) or on a downstream side of the narrowed portion (75) in a stream of exhaust air, and a body frame (10) overlaps the exhaust sensor (59) from an outside in the vehicle width direction. Saddle seat vehicle according to one of the Claims 1 to 8th , wherein a catalyst device (56) is arranged on a rear side of the merging pipe (55 and 255), and the exhaust gas sensor (59) under the engine (11) and between a crankshaft (30) of the motor (11) and a coupling shaft (34) is positioned as viewed in a side view of the vehicle. Saddle seat vehicle according to one of the Claims 1 to 9 , wherein an oil pan (83) is arranged at a lower portion of the engine (11), and the oil pan (83) has a pair of left and right recess portions (83c) extending downward and to outer lateral sides in a front view of the Open the vehicle, and the merging pipe (55 and 255) is arranged on one of the recess areas (83c). Saddle seat vehicle according to one of the Claims 1 to 10 , wherein the merging pipe (55 and 255) is provided with only one exhaust gas sensor (59). Saddle seat vehicle according to one of the Claims 1 to 11 wherein the exhaust gas sensor (59) is arranged at an end portion on a downstream side of the merging pipe (55 and 255).

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