Saddle type vehicle

Abstract

The utility model discloses a saddle type vehicle which comprises an exhaust pipe 51 and a catalyst device 53 extending downwards from a unit swing engine P. A downstream-side exhaust gas sensor S1 is disposed in a downstream-side exhaust pipe 90. The upstream-side exhaust gas sensor S2 is disposed on the upstream side of the catalyst device 53. A downstream-side exhaust gas sensor S1 and an exhaust pipe 100 in which a catalyst device is housed are positioned in a vehicle side view such that at least a part thereof is positioned below a unit swing engine P and behind a dotted line L1 connecting an exhaust pipe connection part 24c and a link member connection part 13. The downstream-side exhaust gas sensor S1 and the upstream-side exhaust gas sensor S2 are connected to electronic control units 15 and 16 through electrical component cables 111 and 112, and are offset in the vehicle width direction on the outer side of the same side with respect to the vehicle body center line in the vehicle width direction. As a result, it is possible to shorten the electrical component cable extending from the exhaust gas sensor on the upstream side of the catalyst device and the exhaust gas sensor on the downstream side exhaust pipe to the ECUs, and it is also possible to compact the wiring of the electrical component cable.

Description

Technical Field

[0001] The utility model relates to a saddle-type vehicle on which a unit swing engine is installed. Background Art

[0002] As a conventional saddle-type vehicle, a vehicle is disclosed in which a unit swing engine is mounted, a catalyst device is arranged midway through an exhaust pipe connected to an internal combustion engine of the unit swing engine, and exhaust gas sensors are provided on the downstream side exhaust pipe on the upstream side of the catalyst device and the downstream side of the catalyst device in the exhaust pipe (refer to Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: JP2019-137238A Utility Model Content

[0006] Technical problems to be solved by the utility model

[0007] In conventional saddle-type vehicles, the exhaust gas sensor located upstream of the catalyst device and the exhaust gas sensor located downstream of the catalyst device in the downstream exhaust pipe are located on different sides of the vehicle center in the vehicle width direction and are spaced apart from each other in the vehicle front-to-rear direction. Consequently, the electrical cables extending from the exhaust gas sensors to the ECU are long, and the cable routing is not compact.

[0008] Technical means to solve technical problems

[0009] The present invention is made in view of the above problems, and a saddle-type vehicle comprises:

[0010] a vehicle body frame; a cylinder block arranged with the cylinder axis facing forward; a crankcase; a crankshaft; a unit swing engine, which is swingably supported by the vehicle body frame via a connecting rod member; and

[0011] An exhaust device connected to a unit swing engine and comprising an exhaust pipe and a catalyst device arranged midway in the exhaust pipe, wherein

[0012] The exhaust pipe extends downward from the unit swing engine,

[0013] The exhaust pipe includes an exhaust pipe accommodating a catalyst device in which a catalyst device is accommodated, an upstream exhaust pipe connected to an upstream side of the exhaust pipe accommodating the catalyst device, and a downstream exhaust pipe connected to a downstream side of the exhaust pipe accommodating the catalyst device.

[0014] The downstream exhaust gas sensor is arranged on the downstream exhaust pipe.

[0015] The upstream exhaust gas sensor is arranged on the upstream side of the catalyst device.

[0016] In a side view of the vehicle body, the downstream exhaust gas sensor and the exhaust pipe accommodating the catalyst device are at least partially located below the unit swing engine and, in the vehicle front-rear direction, are located behind a virtual line connecting an exhaust pipe connecting portion of the unit swing engine and a link member connecting portion, the exhaust pipe connecting portion being connected to an end portion of the exhaust pipe, and the link member connecting portion connecting the link member to the vehicle body frame.

[0017] The downstream exhaust gas sensor and the upstream exhaust gas sensor are connected to the electronic control unit through electrical cables, and

[0018] The downstream side exhaust gas sensor and the upstream side exhaust gas sensor are arranged offset outwardly in the vehicle width direction from a same side of a vehicle body center line in the vehicle width direction.

[0019] According to the above configuration, the electric cable extending from the upstream side exhaust gas sensor or the downstream side exhaust gas sensor to the electronic control unit can be shortened, and the wiring of the electric cable can be made compact.

[0020] Furthermore, in the present invention, the catalyst device is arranged with the longitudinal direction oriented in the vehicle width direction.

[0021] According to the above configuration, the catalyst device is arranged in such a manner that the longitudinal direction of the catalyst device is oriented along the vehicle width direction, so that the space defined below the cylinder block and crankcase of the unit swing engine can be utilized, so that the catalyst device can be arranged in a compact manner.

[0022] Furthermore, in the present invention, the downstream side exhaust gas sensor and the upstream side exhaust gas sensor are arranged on both sides of the catalyst device in a side view of the vehicle.

[0023] According to the above configuration, the downstream exhaust gas sensor and the upstream exhaust gas sensor are arranged on both sides of the catalyst device in the vehicle side view, so that the downstream exhaust gas sensor and the upstream exhaust gas sensor can be arranged close to each other and the electrical cables extending from the exhaust gas sensors can be shortened.

[0024] In addition, in the present invention, the fan has a rotation center that is the same as the rotation center of the crank of the crankshaft; and further includes a fan cover covering the fan, wherein

[0025] The fan cover includes an exhaust port on a rear side relative to the rotation center in a side view of the vehicle, and

[0026] The downstream exhaust gas sensor is arranged on the front side and the lower side with respect to the rotation center of the fan in a vehicle side view.

[0027] According to the above configuration, the exhaust gas from the fan can be prevented from hitting the downstream side exhaust gas sensor, and the temperature of the downstream side exhaust gas sensor can be prevented from decreasing.

[0028] In addition, in the present invention, the unit swing engine includes a cylinder head overlapping with the cylinder block, and

[0029] The vehicle-side surface of the cylinder block or cylinder head is at least partially covered with a resin member,

[0030] The resin member includes a cable fixing portion that fixes at least one of the electric cables.

[0031] According to the above configuration, the electric cable is fixed to the cable fixing portion provided on the resin member, so that the wiring of the electric cable becomes compact while preventing the deflection of the electric cable.

[0032] Furthermore, in the present invention, the resin member is formed by joining a plurality of separate parts, and

[0033] One part includes a joint portion that is inserted into and connected to the other part.

[0034] At least one of the electrical cables is secured by the joint.

[0035] According to the above configuration, the separate engaging portion is utilized, so that the number of components can be reduced and the cost can be reduced without the need to separately provide a cable fixing portion.

[0036] Technical effects of the utility model

[0037] According to the utility model, in a saddle-type vehicle including an exhaust gas sensor arranged on the upstream side of a catalyst device and an exhaust gas sensor arranged on a downstream exhaust pipe on the downstream side of the catalyst device, the electrical cable extending from the exhaust gas sensor to the ECU can be shortened and the wiring of the electrical cable can be made compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a left side view of the entire motorcycle as a saddle-type vehicle according to one embodiment of the present invention.

[0039] Figure 2 yes Figure 1 An enlarged right side view of the main parts of the vehicle.

[0040] Figure 3 yes Figure 1 Left side view of the power unit, intake structure and exhaust device.

[0041] Figure 4 yes Figure 2 Top view of .

[0042] Figure 5 It is a bottom view of the main parts of the motorcycle.

[0043] Figure 6 It is a partial cross-sectional view taken along the crankshaft of the internal combustion engine of the power unit.

[0044] Figure 7 It is shown in Figure 2 An enlarged left side view of the main parts of a vehicle showing an internal combustion engine suspended from a vehicle body frame.

[0045] Figure 8 It is a front view of the main part of the vehicle with the cover removed when viewed from the front.

[0046] Figure 9 It is a perspective view showing a part of the exhaust pipe.

[0047] Figure 10 It is a perspective view of the main parts around the joint in the shield.

[0048] Figure 11 It is an exploded perspective view of the main parts of the first sub-body and the second sub-body.

[0049] Figure 12 is a diagram showing another attachment position of the exhaust gas sensor.

[0050] Figure 13 is a diagram showing another attachment position of the exhaust gas sensor.

[0051] Figure 14 is a diagram showing another attachment position of the exhaust gas sensor. DETAILED DESCRIPTION

[0052] Below, we will refer to Figures 1-14 The saddle-type vehicle according to one embodiment of the present invention is described. 1 to 11. The saddle-type vehicle in this embodiment is a scooter 1, which is shown in the left side view. Figure 1 Shown in.

[0053] Note that in the description of this specification, the front, rear, left, right, up, and down directions correspond to normal references, wherein the straight-forward direction of the motorcycle 1 according to the present embodiment is the front side. In the drawings, FR indicates the front side, RE indicates the rear side, LH indicates the left side, RH indicates the right side, UP indicates the upper side, and DW indicates the lower side.

[0054] like Figure 1 As shown, in the motorcycle 1 , a vehicle body front portion 1F and a vehicle body rear portion 1R are connected to each other via a floor portion 1C, and a vehicle body frame F forming a frame of the vehicle body mainly includes a lower frame member 3 and a main frame member 4 .

[0055] Specifically, a lower frame member 3 extends downward from the head pipe 2 of the vehicle body front portion 1F. The lower frame member 3 is bent horizontally at its lower end and extends rearwardly below the floor portion 1C. At its rear end, a pair of left and right main frame members 4 are connected. Each main frame member 4 has an inclined portion 4a extending obliquely upward and rearward from this connection. The upper portion of the inclined portion 4a is further bent to form a horizontal portion 4b extending substantially horizontally rearward.

[0056] Between the pair of main frame members 4, a storage box 5 is supported on the front side, and a fuel tank (not shown) is supported on the rear side, and the upper sides of the storage box 5 and the fuel tank are covered with a seat 7. In the vehicle body front portion 1F, a handlebar 8 is provided on the upper side so as to be pivotally supported by the head pipe 2, and a front fork 9 extends downward, with a front wheel 10 pivotally supported at the lower end of the front fork 9.

[0057] In the front vehicle body portion 1F, the head pipe 2 and the vertically oriented portions of the lower frame member 3 are covered from the front and rear sides by the front cover 1a and the leg shield 1b. In the floor portion 1C, the front and rear oriented portions of the lower frame member 3 are covered by the lower side covers 1c. In the rear vehicle body portion 1R, the left, right, and rear sides of the main frame member 4 are covered by the vehicle body cover 1d.

[0058] In the motorcycle 1, a power unit P is installed below the main frame member 4, and the power unit P serves as a unit swing engine. Figure 3 As shown, at the front of the power unit P, a single-cylinder, four-stroke, air-cooled internal combustion engine 20 is arranged, and a belt-type continuously variable transmission 60 is arranged at the rear of the power unit P.

[0059] like Figure 7 As shown, the power unit P is provided with a pair of left and right engine hangers 22h protruding forward from the upper portion of the crankcase 22. A link member 11 is provided so as to protrude from the rear side of the main frame member 4, and the ends of the engine hangers 22h are coupled to the link member 11 via a pivot 12. The power unit P is swingably coupled to and supported by the vehicle body frame F.

[0060] like Figure 3 As shown, the internal combustion engine 20 is provided so as to protrude forward to a substantially horizontal state in a generally forward-inclined posture by stacking the crankcase 22, the cylinder block 23, the cylinder head 24, and the head cover 25 in this order. Figure 6 As shown, the crankshaft 21 is oriented in the vehicle width direction and is rotatably supported by the crankcase 22 .

[0061] like Figure 3 As shown, an intake port 24a is formed on the upper surface side of the cylinder head 24, and an intake pipe 31 serving as an intake pipe extends upward from the intake port 24a. An exhaust port 24b is formed on the lower surface side of the cylinder head 24, and an exhaust pipe 51 extends downward from the exhaust port 24b.

[0062] In addition, if Figure 3 As shown, the spark plug 26 is installed and inserted into the cylinder head 24 so as to be close to the head cover 25 located in the center. Figure 2 As shown, an upstream exhaust gas sensor S2 that detects the oxygen concentration in the exhaust gas is installed from the right side and inserted into the right side surface of the cylinder head 24. The upstream exhaust gas sensor S2 is attached to the cylinder head 24 with its tip facing the exhaust port 24b. The upstream exhaust gas sensor S2 is a LAF sensor or an oxygen sensor. An electrical cable 112 extends from the upstream exhaust gas sensor S2, and the electrical cable 112 is routed in the vehicle body and connected to the ECU described later. S One or both of 15 and 16 are connected.

[0063] Reference Figure 6 The crankcase 22 includes a left crankcase portion 22L and a right crankcase portion 22R divided into left and right, and the left crankcase portion 22L and the right crankcase portion 22R rotatably and pivotally support the crankshaft 21 oriented in the vehicle width direction via main bearings 21b and 21b, respectively.

[0064] The alternator 55 is provided on the right side of the crankshaft 21, and a centrifugal cooling fan 56 is integrally attached to the outer rotor 55r of the alternator 55. The fan 56 is provided coaxially with the crankshaft 21, so that the rotation center of the fan 56 is the same as the crank rotation center CL of the crankshaft 21.

[0065] The fan cover 57 covering the right crankcase portion 22R from the right side accommodates the centrifugal cooling fan 56 in its interior. Figure 2 A grille 57g is formed on the fan cover 57, facing the centrifugal cooling fan 56 and serving as an external air introduction port. Figure 2 As shown, in the fan cover 57, a meshed exhaust port 57f is formed in an area on the oblique rear lower side of the outer edge 57e surrounding the grille 57g, and the external air that has been introduced from the grille 57g is discharged from the exhaust port 57f to the outside of the fan cover 57 by the rotational force of the centrifugal cooling fan 56.

[0066] like Figure 2 and Figure 6 As shown, a shroud 70 made of a resin member is surrounded to cover the right side surfaces of the cylinder block 23 and the cylinder head 24 , and the shroud 70 is coupled to the air cover 57 on the right side.

[0067] like Figure 6As shown, the left crankcase section 22L extends rearward and also serves as the transmission case. A transmission case cover 65 covers this transmission case (left crankcase member) 22L from the left side, and a belt-type continuously variable transmission 60 is arranged inside. The drive sprocket 58 is positioned adjacent to the main bearing 21b in the left shaft portion of the crankshaft 21, and the drive pulley 61 of the belt-type continuously variable transmission 60 is located in the left shaft end. Power is transmitted to the valve train on the cylinder head 24 side via the cam chain 59, which is wound around the drive sprocket 58.

[0068] Reference Figure 1 and Figure 3 The reduction gear output shaft of the reduction mechanism 64 provided at the rear of the belt-type continuously variable transmission 60 serves as the rear wheel shaft 28a, on which the rear wheel 28 is provided. A rear cushion (not shown) is interposed between the upper end of the rear portion of the transmission case portion 22L accommodating the reduction mechanism 64 and the upper curved portion of the main frame member 4.

[0069] like Figure 3 As shown, the driven pulley 63 of the belt-type continuously variable transmission 60 is pivotally supported by the reduction gear input shaft 64a of the reduction mechanism 64. The belt 62 is wound around the drive pulley 61 provided on the crankshaft 21 and the driven pulley 63 provided on the reduction gear input shaft 64a. The power of the internal combustion engine 20 is transmitted to the driven pulley 63 via the belt 62. The rotation of the driven pulley 63 is transmitted to the reduction gear input shaft 64a of the reduction mechanism 64 via a centrifugal clutch (not shown). The speed is reduced by the reduction mechanism 64, and the power is transmitted to the rear wheel 28. Figure 6 As shown, the external air intake fan 61F is formed in the pulley half on the left side of the driving pulley 61 .

[0070] like Figure 7 As shown, two electronic control units (hereinafter referred to as ECUs) 15 and 16 are provided on the right side of the upper body and are supported by the main frame member 4 of the vehicle body frame F. Detection signals from various sensors provided at different positions in the vehicle are input to the ECUs 15 and 16, and the ECUs 15 and 16 perform arithmetic processing based on this information and output various control signals to the corresponding drive devices for optimal control.

[0071] like Figure 2 As shown, an oil filter 66 is arranged below the crankcase 22 and is detachable toward the vehicle side surface, and the oil supplied to various locations of the internal combustion engine 20 is filtered by the oil filter 66 .

[0072] Reference Figure 1 The air intake device 30 is connected to the air intake port 24a of the internal combustion engine 20, and the air intake device 30 sucks in external air and sends the external air to the internal combustion engine 20. Figure 4 The intake device 30 includes: an air filter device 40 that draws in and purifies external air; a connecting pipe 36 that is connected to the air filter device 40; a throttle body 33 that is connected to the downstream side of the connecting pipe 36; and an intake pipe 31 that is connected to the upstream side of the throttle body 33. A butterfly throttle valve (not shown) is provided inside the throttle body 33, so that these components constitute an intake system. Figure 3 As shown, a fuel injection valve 37 that injects fuel into the intake passage is provided on the intake port 24 a and the intake pipe 31 .

[0073] The air intake device 30 will be described further. Figure 4 As shown, in the air filter device 40 of the intake device 30, the air filter housing 41 (in which the raw chamber housing 42 on the left and the clean chamber housing 43 on the right are integrated with each other) is separated by a partition 45, and the partition 45 is arranged between the raw chamber housing 42 and the clean chamber housing 43, and an air filter element 44 is arranged therein, so that the air filter element 44 is divided into a non-clean chamber Ca on the raw chamber housing 42 side and a clean chamber Cb on the clean chamber housing 43 side.

[0074] like Figure 3 As shown, an air inlet pipe 47 is arranged in the raw chamber housing 42 with its opening 47a facing forward, and traveling air and the like are drawn into the air inlet pipe 47. Intake air introduced through the opening 45a passes through the interior of the raw chamber Ca, is cleaned, and then is delivered to the clean chamber Cb via the air filter element 44. The clean chamber Cb of the air filter device 40 communicates with the throttle body 33 via a connecting pipe 36 made of elastically deformable rubber.

[0075] like Figure 1 As shown, the exhaust device 50 is connected to the downstream end of the exhaust port 24b of the cylinder head 24. Figure 5 An exhaust pipe connection portion 24c, to which the upstream of the exhaust device 50 is connected, is provided on the lower surface of the cylinder head 24. The exhaust device 50 includes an exhaust pipe 51 connected to the exhaust port 24b of the internal combustion engine 20 and discharging exhaust gas; a catalyst device 53 disposed midway inside the exhaust pipe 51 and purifying the exhaust gas; and a muffler 52 connected to the downstream of the exhaust pipe 51, so that these components constitute an exhaust system.

[0076] Reference Figure 2 and Figure 5Exhaust pipe 51 communicates with exhaust port 24b, extends downward from the lower surface of cylinder head 24, bends obliquely forward on the left side, further bends rearward, and then bends rightward. It extends from the left side to the right side on the lower side of crankcase 22, bends further rearward, and then extends rearward, and is connected to muffler 52 arranged on the right side of rear wheel 28. A catalyst device 53 is provided midway in exhaust pipe 51, and exhaust pipe 51 includes: a catalyst device-accommodating exhaust pipe 100, in which catalyst device 53 is accommodated; an upstream exhaust pipe 80 connected to the upstream side of exhaust pipe 100; and a downstream exhaust pipe 90 connected to the downstream side of exhaust pipe 100.

[0077] Figure 9 A main portion of the exhaust pipe 51 is shown.

[0078] The upstream exhaust pipe 80 of the exhaust pipe 51 includes a vertical portion 80a extending downward from the exhaust pipe connection portion 24c of the cylinder head 24; a lateral extension portion 80b extending on one side relative to the crankcase partition plane on the front side of the catalyst device 53; and a curved portion 80c that curves rearward from the downstream end of the lateral extension portion 80b and folds back into a U-shape relative to the other side of the crankcase partition plane. The downstream end of the curved portion 80c is connected to the exhaust pipe 100 that accommodates the catalyst device. The upstream exhaust pipe 80 in this embodiment is formed by combining a first exhaust pipe 81 on the upstream side and a second exhaust pipe 82 on the downstream side, but may be a single unit rather than a separate unit.

[0079] The flange portion 80d of the exhaust pipe connecting portion 24c to be attached to the internal combustion engine 20 is fixedly adhered to the upstream end of the upstream side exhaust pipe 80. Figure 5 As shown, a pair of bolt insertion holes 80 e are provided in the flange portion 80 d , and the flange portion 80 d is fixed to the exhaust pipe connecting portion 24 c of the cylinder head 24 with bolts 69 .

[0080] Catalyst device 53 is housed inside exhaust pipe 100, which houses the catalyst device, and is mounted on the vehicle with the longitudinal direction of catalyst device 53 oriented in the vehicle width direction. Catalyst device 53 is a honeycomb-like porous structure having a large number of pores extending in its axial direction, and carries, for example, platinum, rhodium, or palladium as a catalyst for decomposing exhaust gas components.

[0081] Refer to 5 and Figure 9 , the downstream exhaust pipe 90 is formed to extend to the right side to extend from the exhaust pipe 100 accommodating the catalyst device and then bend backward. The downstream exhaust pipe 90 further extends backward, and its downstream end is connected to the muffler 52. The downstream exhaust pipe 90 in this embodiment is composed of a single member, but may be a structure having a split structure in the middle. Figure 5As shown, the downstream exhaust pipe 90 is provided so as to be partially located on an extension line of the vehicle body frame F and also located further outward than the crankcase 22 in the vehicle width direction.

[0082] The exhaust gas discharged from the internal combustion engine 20 passes through the upstream exhaust pipe 80 from the exhaust port 24b, is purified while passing through the catalyst device 53 in the exhaust pipe 100 accommodating the catalyst device, then passes through the downstream exhaust pipe 90 and the muffler 52, and is discharged to the outside air from the atmospheric opening 52a of the muffler 52.

[0083] like Figure 2 As shown, the downstream exhaust pipe 90 of the exhaust pipe 51 is provided with a downstream exhaust gas sensor S1, which detects the oxygen concentration and the like in the exhaust gas after passing through the catalyst device 53. The downstream exhaust gas sensor S1 is a LAF sensor or an O2 sensor. The downstream exhaust gas sensor S1 is attached to the exhaust pipe 51 inserted from the upper surface of the downstream exhaust pipe 90. Figure 7 As shown, the electric cable 111 extends from the downstream exhaust gas sensor S1, and the electric cable 111 is routed to the vehicle body and is connected to the ECU S One or both of 15 and 16 are connected.

[0084] like Figure 7 As shown, the downstream exhaust gas sensor S1 and the exhaust pipe 100 accommodating the catalyst device are arranged at least partially below the main body of the power unit P in a side view of the vehicle.

[0085] like Figure 7 As shown, the downstream exhaust gas sensor S1 and the catalyst device 53 are partially arranged on the rear side of the dashed line L1 in the vehicle front-rear direction. In the vehicle side view, the dashed line L1 is a dashed line connecting the link member coupling portion 13 and the exhaust pipe connecting portion 24c. The link member coupling portion 13 is the location where the link member 11 is joined to the main frame member 4 of the vehicle body frame F, where the exhaust pipe 51 is connected to the internal combustion engine 20.

[0086] Furthermore, the downstream exhaust gas sensor S1 and the upstream exhaust gas sensor S2 are arranged on either side of the catalyst device 53 in a side view of the vehicle. In this manner, the catalyst device 53 is positioned in the middle. Consequently, the downstream exhaust gas sensor S1 and the upstream exhaust gas sensor S2 can be arranged close to each other, and the electrical cables 111 and 112 can be routed close to each other, making it possible to shorten the lengths of the electrical cables 111 and 112 and, by routing the electrical cables together, to make the electrical cables compact.

[0087] Furthermore, in a side view of the vehicle, the downstream exhaust gas sensor S1 is arranged on the front side and the lower side relative to the rotation center of the centrifugal cooling fan 56. Exhaust gas from the exhaust port 57f of the fan cover 57 covering the centrifugal cooling fan 56 can be prevented from hitting the downstream exhaust gas sensor S1, and the temperature of the downstream exhaust gas sensor S1 can be prevented from decreasing.

[0088] In addition, if Figure 8 As shown, the downstream exhaust gas sensor S1 and the upstream exhaust gas sensor S2 are offset outwardly, to the same right side, relative to the vehicle body centerline in the vehicle width direction. This arrangement of the downstream exhaust gas sensor S1 and the upstream exhaust gas sensor S2 offset to the same side allows the electrical cable extending to the ECU to be shortened and the wiring of the electrical cables to be made more compact, compared to a case where the downstream exhaust gas sensor S1 and the upstream exhaust gas sensor S2 are arranged on different sides in the vehicle width direction.

[0089] In this embodiment, the upstream exhaust gas sensor S2 is arranged on the cylinder head 24, but may be attached from the right side to be positioned on the right side of the vehicle center relative to the upstream exhaust pipe 80. For example, the upstream exhaust gas sensor S2 may be attached from the right side. Figure 12 The right front side shown is attached to the vertical portion 80a of the upstream exhaust pipe 80, and can also be connected from the Figure 13 The illustrated right side is attached to the vertical portion 80a of the upstream exhaust pipe 80, or may be attached from the oblique right rear side or the like.

[0090] In this embodiment, the downstream exhaust gas sensor S1 is installed from above the downstream exhaust pipe 90. However, for example, Figure 13 and Figure 14 As shown, the downstream exhaust gas sensor S1 may be attached from above or from the rear side of the downstream exhaust pipe 90, or may be attached from the rear side of the downstream exhaust pipe 90, as shown in FIG. Figure 14 shown.

[0091] like Figure 2 As shown, the side surfaces of the cylinder block 23 and the cylinder head 24 of the internal combustion engine 20 are covered with a shroud 70 as a resin member.

[0092] The shroud 70 is constructed to cover the periphery of the cylinder block 23 and cylinder head 24 by coupling a first split body 71 and a second split body 72. The first split body 71 and the second split body 72 are divided into upper and lower portions along the cylinder axis in a side view of the vehicle. The shroud 70 is supported by the internal combustion engine 20 by being fastened to the fastening portion 57a of the fan cover 57 or the front portion of the head cover 25. The head cover 25 protrudes from an opening on the front side of the shroud 70.

[0093] The shroud 70 has a shape that is bent toward the head cover 25 side toward the front side on one side of the cylinder block 23 and the cylinder head 24, and forms a space between the shroud 70 and the internal combustion engine 20. A cooling air passage (not shown) is formed by the space between the internal combustion engine 20 and the shroud 70. The centrifugal cooling fan 56 draws in external air and guides the external air into the shroud 70 to flow through the cooling air passage, so that the internal combustion engine 20 is effectively cooled by the air. Figure 7 As shown, on the right side wall of the shield 70 , an engaging portion 71 c , a gripping portion 71 d , and a holding portion 72 d , which will be described later, are provided as a cable fixing portion 70 b for fixing the electric cable 111 or the electric cable 112 .

[0094] like Figure 10 As shown, the first and second sub-bodies 71 and 72 of the shroud 70 are joined together in such a manner that their joining edge portions 71 b and 72 b are joined together.

[0095] like Figure 11 As shown, a claw-shaped engaging portion 71c is provided on the engaging edge portion 71b of the first split body 71 so as to protrude toward the second split body 72. A step portion 71c1 parallel to the engaging edge portion 71b is provided on the surface of the engaging portion 71c. In addition, a recessed portion 71c2 for holding the electrical cable 111 is formed on the rear surface of the engaging portion 71c, and the engaging portion 71c serves as the cable fixing portion 70b.

[0096] The second split body 72 has a joint portion 72c formed at a position corresponding to the joint portion 71c of the first split body 71 in the joint edge portion 72b. The joint portion 72c of the first split body 71 is inserted into and fitted into the joint portion 72c. The joint portion 72c is formed to protrude from the wall surface 72a of the second split body 72, and the hole portion 72c1 into which the joint portion 71c is inserted and fitted is formed in a predetermined shape.

[0097] When the engaging portion 71 c of the first split body 71 is inserted into the hole 72 c 1 of the engaging portion 72 c of the second split body, the engaging portion 71 c engages with the engaging portion 72 c , and the first split body 71 and the second split body 72 are integrally joined together.

[0098] The electric cable 111 is fitted into the recess 71c2 of the engaging portion 71c, and the electric cable 111 is held.

[0099] like Figure 10 As shown, the second split body 72 has a retaining portion 72d for retaining an electrical cable located slightly lower than the joint edge 72b and protruding from the wall surface 72a. The retaining portion 72d is formed in an L-shape with an upper opening, and the electrical cable is inserted into the retaining portion 72d through the opening and retained from below.

[0100] like Figure 7 As shown, a grip portion 71d for gripping an electrical cable is provided on the joint edge portion 71b of the first split body 71 at a position near the front side of the shield 70, projecting from the wall surface 71a and extending substantially at a right angle relative to the joint edge portion 71b. A groove portion 71d1 having a substantially C-shaped cross section is formed in the grip portion 71d, and the cable is inserted and mounted in the groove portion 71d1 and gripped by the groove portion 71d1.

[0101] like Figure 7 As shown, the electric cable 111 extending from the downstream exhaust gas sensor S1 is routed along the joint edge of the first and second split bodies 71 and 72, inserted into and held by the retaining portion 72d, installed in the recess 71cc of the joint portion 71c, and held near the cover 25 by the grip portion 71d together with the electric cable 112 extending from the upstream exhaust gas sensor S2. The electric cables 111 and 112 are then routed obliquely upward and rearward along the main frame member 4 of the vehicle body frame F and connected to the ECUs 15 and 16.

[0102] In this embodiment, the shroud 70, which covers the periphery of the cylinder block 23 and cylinder head 24, serves as a resin member. However, it is sufficient as long as it at least partially covers the grease assembly portion of the cylinder block 23 and cylinder head 24 and comprises separate parts integrated together via a joint. Furthermore, in this embodiment, the shroud 70, serving as a resin member, comprises two separate parts: a first separate part 71 and a second separate part 72. However, the shroud 70 may comprise two or more separate parts.

[0103] The motorcycle 1 of the saddle-type vehicle according to one embodiment of the present invention is configured as described above, and achieves the following effects.

[0104] The motorcycle 1 of the present embodiment includes: a vehicle body frame F; a cylinder block 23, which is arranged with a cylinder axis C facing forward; a crankcase 22; a crankshaft 21; a power unit P, which is swingably supported by the vehicle body frame F via a connecting rod member 11; and an exhaust device 50, which is connected to the power unit P and includes an exhaust pipe 51 and a catalyst device 53 arranged in the middle of the exhaust pipe 51, wherein the exhaust pipe 51 extends downward from the power unit P, the exhaust pipe 51 includes an exhaust pipe 100 accommodating a catalyst device in which the catalyst device 53 is accommodated, an upstream exhaust pipe 80 connected to the upstream side of the exhaust pipe 100 accommodating the catalyst device, and a downstream exhaust pipe 90 connected to the downstream side of the exhaust pipe 100 accommodating the catalyst device, and in the side view of the vehicle body, the downstream exhaust gas sensor S1 is arranged on the downstream exhaust pipe 90. The upstream exhaust gas sensor S2 is arranged on the upstream side of the catalyst device 53, the downstream exhaust gas sensor S1 and the exhaust pipe 100 accommodating the catalyst device are at least partially located below the power unit P, and in the front-rear direction of the vehicle, are located on the rear side of the imaginary line L1 connecting the exhaust pipe connection part 24c of the connecting unit swing engine P and the connecting rod member connection part 13, the exhaust pipe connection part 24c is connected to the end of the exhaust pipe 51, the connecting rod member connection part 13 connects the connecting rod member 11 to the vehicle body frame F, the downstream exhaust gas sensor S1 and the upstream exhaust gas sensor S2 are connected to the electronic control units 15 and 16 respectively by electrical cables 111 and 112, and the downstream exhaust gas sensor S1 and the upstream exhaust gas sensor S2 are arranged to be offset to the outside of the same side of the center line of the vehicle body in the vehicle width direction relative to the vehicle width direction.

[0105] According to the above configuration, the electric cables 111 and 112 extending from the upstream side exhaust gas sensor S2 and the downstream side exhaust gas sensor S1 to the ECU can be shortened, and the wiring of the electric cables can be made compact.

[0106] In addition, the catalyst device 53 is arranged in such a manner that the longitudinal direction of the catalyst device 53 is oriented along the vehicle width direction, so that the space defined below the cylinder block 23 and crankcase 22 of the power unit P can be utilized, so that the catalyst device 53 can be arranged in a compact manner.

[0107] In addition, in the vehicle side view, the catalyst device 53 is interposed between the downstream exhaust gas sensor S1 and the upstream exhaust gas sensor S2, so that the downstream exhaust gas sensor S1 and the upstream exhaust gas sensor S2 can be arranged close to each other and the electrical cables 111 and 112 extending from these exhaust gas sensors respectively can be shortened.

[0108] Furthermore, a centrifugal cooling fan 56 having the same rotation center as the crank rotation center CL of the crankshaft 21 and a fan cover 57 covering the fan 56 are included, wherein the fan cover 57 includes an exhaust port 57f on the rear side relative to the rotation center in a vehicle side view, and the downstream side exhaust gas sensor S1 is arranged on the front side and the lower side relative to the rotation center of the fan 56 in a vehicle side view. Therefore, exhaust gas from the centrifugal cooling fan 56 can be prevented from hitting the downstream side exhaust gas sensor S1, and a decrease in the temperature of the downstream side exhaust gas sensor S1 can be prevented.

[0109] Furthermore, the power unit P includes a cylinder head 24 that overlaps with the cylinder block 23. The vehicle-side surfaces of the cylinder block 23 and the cylinder head 24 are at least partially covered by a shroud 70, which is a resin member. The shroud 70 includes a cable fixing portion 70b that fixes at least one of the electric cables 111 and 112. Therefore, the electric cables 111 and 112 are fixed to the cable fixing portion 70b provided on the shroud 70, so that the electric cables 111 and 112 can be prevented from being skewed and the wiring of the cables 111 and 112 can be made compact.

[0110] Furthermore, the hood 70 is formed by joining the first split body 71 and the second split body 72. The first split body 71 includes a joint portion 71 c to be inserted into and joined to the joint portion 72 c of the second split body 72, and the electrical cable 111 is fixed by the joint portion 71 c. Therefore, the use of the joint portion of the first split body and the second split body makes it possible to reduce the number of components and reduce costs without having to provide a separate cable fixing portion.

[0111] A motorcycle according to one embodiment of the present invention has been described above. However, the present invention is not limited to the above embodiment, but also includes various implementations within the scope of the present invention.

[0112] Reference Mark List

[0113] P Power Unit

[0114] C Cylinder axis

[0115] CL crank rotation center

[0116] F Body frame

[0117] S1 downstream exhaust gas sensor

[0118] S2 upstream exhaust gas sensor

[0119] 1 motorcycle

[0120] L1 dotted line

[0121] 11 Connecting rod

[0122] 13 Connecting rod member connection

[0123] 15 ECU

[0124] 16 ECU

[0125] 20 Internal combustion engine

[0126] 21 Crankshaft

[0127] 22 Crankcase

[0128] 23 Cylinder block

[0129] 24 cylinder head

[0130] 24C exhaust pipe connection

[0131] 50 Exhaust

[0132] 51 Exhaust pipe

[0133] 53 Catalyst device

[0134] 56 Fan

[0135] 57 Fan cover

[0136] 57 Exhaust port

[0137] 70 Shield

[0138] 70b Cable fixing part

[0139] 71 First Clone

[0140] 71c joint

[0141] 72 Second Clone

[0142] 80 Upstream exhaust pipe

[0143] 90 Downstream exhaust pipe

[0144] 100 Exhaust pipe containing catalyst device

[0145] 111 Electrical cables

[0146] 112 Electrical cables.

Claims

1. A saddle-type vehicle, characterized in that: include: A vehicle body frame (F); a cylinder block (23) arranged with a cylinder axis (C) facing forward; a crankcase (22); a crankshaft (21); a unit swing engine (P) swingably supported by the vehicle body frame (F) via a connecting rod member (11); and An exhaust device (50) is connected to the unit swing engine (P) and includes an exhaust pipe (51) and a catalyst device (53) arranged midway in the exhaust pipe (51), wherein The exhaust pipe (51) extends downward from the unit swing engine (P), The exhaust pipe (51) includes a catalyst device-containing exhaust pipe (100) in which the catalyst device (53) is contained, an upstream exhaust pipe (80) connected to the upstream side of the exhaust pipe (100) containing the catalyst device, and a downstream exhaust pipe (90) connected to the downstream side of the exhaust pipe (100) containing the catalyst device. A downstream exhaust gas sensor (S1) is arranged on the downstream exhaust pipe (90), An upstream exhaust gas sensor (S2) is arranged on the upstream side of the catalyst device (53), In a side view of the vehicle body, the downstream exhaust gas sensor (S1) and the exhaust pipe (100) accommodating the catalyst device are at least partially located below the unit swing engine (P) and, in the vehicle front-rear direction, are located on the rear side of a dotted line (L1) connecting an exhaust pipe connecting portion (24c) of the unit swing engine (P) and a link member connecting portion (13), the exhaust pipe connecting portion (24c) being connected to an end of the exhaust pipe (51), and the link member connecting portion (13) connecting the link member (11) to the vehicle body frame (F). The downstream exhaust gas sensor (S1) and the upstream exhaust gas sensor (S2) are connected to the electronic control units (15, 16) via electrical cables (111, 112), respectively. The downstream exhaust gas sensor (S1) and the upstream exhaust gas sensor (S2) are arranged offset outwardly on the same side of the vehicle body center line in the vehicle width direction. The unit swing engine (P) includes a cylinder head (24) overlapping with the cylinder block (23), and The vehicle side surface of the cylinder block (23) or the cylinder head (24) is at least partially covered with a resin member (70), The resin member (70) includes a cable fixing portion (70b, 71c, 71d, 72d) for fixing at least one of the electric cables (111, 112), and The resin member (70) is formed by joining a plurality of separate bodies (71, 72). One split body (71) includes a joint (71c) inserted into and connected to the other split body (72), At least one of the electric cables (111, 112) is fixed by the joint (71c).

2. The saddle-type vehicle according to claim 1, characterized in that The catalyst device (53) is arranged with its longitudinal direction oriented along the width direction of the vehicle.

3. The saddle-type vehicle according to claim 2, characterized in that: The downstream exhaust gas sensor (S1) and the upstream exhaust gas sensor (S2) are arranged on both sides of the catalyst device (53) in a vehicle side view.

4. The saddle-type vehicle according to claim 1 or 2, characterized in that: Also includes, A fan (56) having a rotation center that is the same as the crank rotation center (CL) of the crankshaft (21); and a fan cover (57) covering the fan (56), wherein The fan cover (57) includes an exhaust port (57f) on the rear side relative to the rotation center in a side view of the vehicle, and The downstream exhaust gas sensor (S1) is arranged on the front side and the lower side relative to the rotation center of the fan (56) in the vehicle side view.

Images