CN216034900U - Saddle-ride type vehicle - Google Patents

Abstract

The utility model provides a straddle type vehicle which restrains interference between a catalyst and a connecting member and protrusion of the catalyst towards the outside of the vehicle width direction. The straddle-type vehicle is provided with an engine-side pivot shaft section (5) arranged below a cylinder (41) of an engine (11), an extension section (60) extending from a crankcase (40) of the engine (11) to the engine-side pivot shaft section (5), a connecting member (8) connecting a frame and the engine-side pivot shaft section (5), and a catalytic converter (70) arranged between the cylinder (41) and the connecting member (8), wherein the whole of the engine-side pivot shaft section (5) is arranged in front of the catalytic converter (70), and the whole of the catalytic converter (70) is arranged within a vehicle width direction range (W1) of the crankcase (40) when viewed from the front-rear direction.

Description

Saddle-ride type vehicle

Technical Field

The present invention relates to a straddle-type vehicle.

Background

Conventionally, in a saddle-ride type vehicle, there is known a structure in which: the vehicle is provided with a link member disposed below a cylinder of the engine and connecting a frame and a crankcase via a pivot shaft, and a catalyst is disposed behind the pivot shaft on the engine side (see, for example, international publication No. 2016/002952).

SUMMERY OF THE UTILITY MODEL

However, there is still room for improvement in terms of suppressing the catalyst from protruding outward in the vehicle width direction while suppressing interference between the catalyst and the link member (connecting member).

The utility model prevents interference between the catalyst and the connecting member and prevents the catalyst from protruding outward in the vehicle width direction.

The present invention has the following configuration.

(1) A straddle-type vehicle according to an aspect of the present invention includes: a pivot portion 5 disposed below a cylinder 41 of the engine 11; an extension portion 60 extending from the crankcase 40 of the engine 11 to the pivot portion 5; a coupling member 8 for coupling the frame 20 and the pivot portion 5; and a catalyst 70 disposed between the cylinder 41 and the connecting member 8, wherein at least a part of the pivot portion 5 is disposed in front of the catalyst 70, and at least a part of the catalyst 70 is disposed within a vehicle width direction range W1 of the crankcase 40 when viewed from the front-rear direction.

(2) In the saddle-ride type vehicle according to the above (1), the extending portion 60 may have a recessed portion 61 recessed outward in the vehicle width direction from a vehicle width direction inner side surface 60a of the extending portion 60.

(3) In the saddle-ride type vehicle according to the above (1) or (2), the connecting member 8 may extend forward and upward from the pivot portion 5 when viewed in the vehicle width direction.

(4) In the saddle-ride type vehicle according to any one of (1) to (3), an upper end of the extending portion 60 may extend rearward and upward from the pivot portion 5 as viewed in the vehicle width direction.

(5) In the saddle-ride type vehicle according to any one of the above (1) to (4), the extending portion 60 extending from the crankcase 40 may extend forward of the catalyst 70, and the connecting member 8 connected to the frame 20 may extend forward of the catalyst 70.

(6) In the saddle-ride type vehicle according to any one of the above (1) to (5), the pivot portion 5 may extend in the vehicle width direction, the pair of left and right extending portions 60 may be provided on the extending portion 60, and the pivot portion 5, the pair of left and right extending portions 60, and the crankcase 40 may constitute a closed cross-sectional structure 65.

According to the saddle-ride type vehicle described in the above (1) of the present invention, the following effects are exhibited by the provision of the pivot portion disposed below the cylinder of the engine, the extending portion extending from the crankcase of the engine to the pivot portion, the connecting member connecting the frame and the pivot portion, and the catalyst disposed between the cylinder and the connecting member, at least a part of the pivot portion being disposed in front of the catalyst, and at least a part of the catalyst being disposed within the vehicle width direction of the crankcase as viewed from the front-rear direction.

By disposing at least a part of the pivot portion in front of the catalyst, it is possible to suppress the coupling member from being too close to the catalyst during swinging, as compared with the case where the pivot portion is disposed behind the catalyst. Further, by disposing at least a part of the catalyst within the vehicle width direction range of the crankcase as viewed from the front-rear direction, the catalyst can be suppressed from protruding outward in the vehicle width direction as compared with a case where the catalyst is disposed outside the vehicle width direction range of the crankcase as viewed from the front-rear direction. Therefore, the catalyst can be prevented from protruding outward in the vehicle width direction while preventing interference between the catalyst and the connecting member. Further, the extension portion extends from the crankcase, whereby the extension portion can be shortened as compared with the case where the extension portion extends from another place.

According to the saddle-ride type vehicle described in the above (2) of the present invention, the extending portion has the concave portion that is recessed outward in the vehicle width direction from the inside in the vehicle width direction of the extending portion, and thereby the following effects are exhibited.

The extension portion can be reduced in weight by the recess portion. Further, the recessed portion can be made less visible from the outside in the vehicle width direction than in the case where the recessed portion is recessed inward in the vehicle width direction from the outside in the vehicle width direction of the extending portion.

According to the saddle-ride type vehicle described in the above (3) of the present invention, the connecting member extends forward and upward from the pivot portion when viewed in the vehicle width direction, thereby achieving the following effects.

The connecting member can be prevented from being too close to the ground surface when the connecting member swings, as compared with the case where the connecting member extends downward from the pivot portion when viewed from the vehicle width direction. Therefore, interference between the connecting member and the ground can be suppressed.

According to the saddle-ride type vehicle described in the above (4) of the present invention, the upper end of the extending portion extends rearward and upward from the pivot portion as viewed in the vehicle width direction, thereby achieving the following effects.

The rigidity of the extending portion can be improved as compared with a case where the extending portion extends rearward from the pivot portion with the same vertical width as viewed in the vehicle width direction.

According to the saddle-ride type vehicle described in the above (5) of the present invention, the extending portion extending from the crankcase extends to a position forward of the catalyst, and the connecting member connected to the frame extends to a position forward of the catalyst, thereby achieving the following effects.

Compared to the case where the extending portion extending from the crankcase extends to the rear of the catalyst and the connecting member connected to the frame extends to the rear of the catalyst, the length of the connecting member can be reduced, and therefore the connecting member can be made lightweight. Further, since the swing range of the coupling member is not increased more than necessary, interference between the coupling member and the ground surface can be suppressed.

According to the saddle-ride type vehicle described in the above (6) of the present invention, the pivot portion extends in the vehicle width direction, the pair of left and right extending portions is provided on the extending portion, and the pivot portion, the pair of left and right extending portions, and the crankcase constitute the closed cross-sectional structure, thereby achieving the following effects.

The rigidity of the structure (closed cross-sectional structure) including the pivot shaft portion, the pair of left and right extending portions, and the crankcase can be improved as compared with the case where the pivot shaft portion, the pair of left and right extending portions, and the crankcase constitute an open cross-sectional structure. As described above, the extending portion extends from the crankcase, and therefore there is a demand for improvement in rigidity, but the rigidity can be improved by forming the extending portion into a closed cross-sectional structure.

Drawings

Fig. 1 is a left side view of a motorcycle according to an embodiment.

Fig. 2 is a left side view of the periphery including the catalytic converter when the motorcycle of the embodiment is in the 1G state.

Fig. 3 is a front view of the periphery of the embodiment including the catalytic converter.

Fig. 4 is a perspective view of the periphery including the catalytic converter of the embodiment.

Fig. 5 is a left side view of the periphery including the catalytic converter when the engine-side pivot portion of the embodiment is at the lowermost position due to the swing.

Fig. 6 is a left side view corresponding to fig. 2, including the periphery of the catalytic converter in the modification of the embodiment.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings. In the following description, a motorcycle as an example of a saddle-ride type vehicle will be described. In the drawings used in the following description, an arrow FR indicating the front of the vehicle, an arrow LH indicating the left of the vehicle, an arrow UP indicating the upper side of the vehicle, and a line CL indicating the left-right center of the vehicle body of the motorcycle according to the present embodiment are shown at appropriate positions.

< vehicle entirety >

As shown in fig. 1, a motorcycle 1 (saddle-ride type vehicle) is a unit swing type motorcycle. The motorcycle 1 is a scooter type vehicle having left and right bottom pedals on which a driver places his feet. The motorcycle 1 includes a front wheel 3 steered by a handlebar 2 and a rear wheel 4 driven by a power unit 10 including a power source. Hereinafter, the motorcycle may be simply referred to as a "vehicle".

A steering system component including the handlebar 2 and the front wheel 3 is supported to be able to steer a head pipe 21 at the front end of the frame 20. The front lower portion of the power unit 10 is supported by a support bracket 7 at the lower portion of the frame 20 via a coupling member 8 so as to be vertically swingable. The rear end portion of the power unit 10 is supported at the rear portion of the frame 20 via a rear cushion 9 as a cushion device.

The frame 20 includes: a head pipe 21 extending in the vertical direction while being inclined so as to be positioned more rearward as it goes to the upper side in a side view; an upper-lower frame 22 extending rearward from a lower portion of the head pipe 21 in a manner of being high in front and low in rear; a lower down frame 23 extending downward from the lower part of the head pipe 21 at a steeper inclination than the upper down frame 22 and then bent rearward; and a rear frame 24 extending rearward from a rear end portion of the downward lower frame 23 in a manner low in front and high in rear.

The periphery of the vehicle body frame 20 is covered with a vehicle body cover 30. A seat 28 on which an occupant sits is provided above the rear portion of the vehicle body cover 30. The vehicle body cover 30 includes: a pair of left and right bottom pedals 31 for putting feet on a driver seated in the seat 28; a center tunnel 32 extending in the vehicle front-rear direction between the left and right bottom steps 31; a front body 33 connected to the front of the center tunnel 32 and the left and right bottom steps 31; and a rear body 34 connected to the rear of the center tunnel 32 and the left and right bottom steps 31. Above the center tunnel 32, a straddling space 38 where the occupant easily straddles the vehicle body is formed between the seat 28 and the handlebar 2.

The power unit 10 is a swing type power unit in which an engine 11 and a power transmission structure 12 are integrated. The power unit 10 includes: an engine 11 as an internal combustion engine that combusts a combustible mixture to obtain an output; an ACG starter motor (generator), not shown, functioning as a starter and a generator; and a transmission 15 (power transmission mechanism) coupled to the crankshaft 14 and transmitting power from the engine 11 to the rear wheel 4 as a drive wheel.

< Engine >

The engine 11 is a single cylinder engine having a crankshaft 14 along the vehicle width direction. As shown in fig. 2, the engine 11 includes: a crankcase 40 that rotatably supports the crankshaft 14 (see fig. 1) and accommodates the crankshaft 14; and a cylinder 41 projecting forward and upward from a front end portion of the crankcase 40.

The cylinder 41 includes: a cylinder block 41a coupled to a front end of the crankcase 40; a cylinder head 41b coupled to a front end of the cylinder block 41 a; and a head cover 41c that covers a front end portion of the cylinder head 41 b.

An intake pipe, not shown, is connected to an upper wall of the cylinder head 41 b. The intake pipe is connected to an air cleaner 57 (see fig. 1) via a throttle area, a connecting pipe, and the like (not shown). As shown in fig. 1, the air cleaner 57 is supported on the upper portion of the power unit 10. Thereby, the air cleaner 57 swings integrally with the power unit 10.

A transmission case 50 is connected to the left side of the crankcase 40 in the vehicle width direction. The transmission 15 is housed inside the transmission case 50. The drive side portion of the transmission 15 is coupled to the crankshaft 14. The left end of the crankshaft 14 protrudes in the vehicle width direction from the crankcase 40. The transmission 15 includes: a drive pulley 51 fitted to the left end portion of the crankshaft 14; a driven pulley 52 fitted to the driven shaft; and an endless V-belt 53 wound around the drive pulley 51 and the driven pulley 52. That is, the transmission 15 is a V-belt type continuously variable transmission.

As shown in fig. 3, a generator case 55 is connected to the vehicle width direction right side of the crankcase 40. An ACG starter motor (generator), not shown, is housed inside the generator case 55.

As shown in fig. 1, a rear end portion of the power unit 10 is provided with a rear wheel axle 4a (axle of the rear wheel 4) projecting rightward (vehicle body center side). The rotational power of the crankshaft 14 is transmitted to the rear axle 4a via the power transmission structure 12 (e.g., a transmission 15, a centrifugal clutch, a driven shaft, and a reduction mechanism, not shown). Thereby, the rear wheel 4 supported by the rear wheel axle 4a is driven to run the vehicle.

< catalyst disposition Structure >

Fig. 2 is a left side view of the periphery including the catalytic converter 70 when the motorcycle 1 is in the 1G state. Here, the 1G state is a state in which the rear wheel 4 (see fig. 1) is grounded and the rear cushion 9 (see fig. 1) is sunk by an amount corresponding to the vehicle weight. As shown in fig. 2, the motorcycle 1 includes a catalyst arrangement structure 59 in which a catalytic converter 70 (catalyst) is arranged between an exhaust port of the engine 11 and an exhaust muffler (not shown).

The catalyst arrangement structure 59 includes: an engine-side pivot portion 5 (pivot portion) disposed below the cylinder 41 of the engine 11; an extension 60 extending from the crankcase 40 of the engine 11 to the engine-side pivot shaft portion 5; a coupling member 8 for coupling the frame 20 (see fig. 1) and the engine-side pivot portion 5; and a catalytic converter 70 disposed between the cylinder 41 and the coupling member 8. In the figure, reference numeral 73 denotes a cover that covers the catalytic converter 70 from above, and reference numeral 74 denotes a passage for introducing cooling air (for example, outside air) into the transmission case 50.

The engine-side pivot portion 5 is a pivot (swing shaft) extending in the vehicle width direction. Hereinafter, the center Pe of the engine-side pivot portion 5 is also referred to as "engine-side pivot center Pe". The engine-side pivot portion 5 is disposed entirely in front of the catalytic converter 70 in a side view (in the vehicle width direction). The engine-side pivot portion 5 is disposed entirely within a range H1 in the height direction of the cylinder head 41b in side view. Here, the range H1 in the height direction of the cylinder head 41b is a range between a boundary line J1 (hereinafter also referred to as a "cylinder-body-side boundary line J1") between the cylinder block 41a and the cylinder head 41b and a boundary line J2 (hereinafter also referred to as a "cylinder-head-side boundary line J2") between the cylinder head 41b and the cylinder head cover 41 c.

As shown in fig. 4, the extending portion 60 is provided in a pair of left and right. In the figure, reference numeral 60L denotes an extension portion on the left side, and reference numeral 60R denotes an extension portion on the right side. The extension 60 extends from the front lower portion of the crankcase 40 to the engine side pivot portion 5. The extension 60 extends from the front lower portion of the crankcase 40 to a position forward of the catalytic converter 70. The front end of the extension portion 60 is connected to the vehicle width direction outer end portion of the engine side pivot portion 5 via a shock absorbing member (not shown) such as a rubber damper. The rear end of the extension 60 is integrally coupled to the front lower portion of the crankcase 40.

The engine-side pivot shaft portion 5, the pair of right and left extending portions 60, and the front lower portion of the crankcase 40 constitute a closed cross-sectional structure 65 having a rectangular frame shape when viewed in the vertical direction. The extending portion 60 extends slightly upward (substantially rearward) from the engine-side pivot portion 5 in the side view of fig. 2 in the 1G state. The lower surface 60c of the extension portion 60 is formed in a planar shape along the direction in which the extension portion 60 extends.

As shown in fig. 4, the extending portion 60 has a recessed portion 61 recessed outward in the vehicle width direction from a vehicle width direction inner side surface 60a of the extending portion 60. The recess 61 is a portion that opens a part of the vehicle width direction inner side portion of the extending portion 60 inward in the vehicle width direction. The recess 61 is provided with a pair of upper and lower portions. The recess 61 extends along the direction in which the extension 60 extends. The vehicle width direction outer surface 60b of the extending portion 60 is a flat surface without the recess 61. The recessed portion 61 is covered from the outside in the vehicle width direction by the vehicle width direction outer side surface 60b of the extending portion 60 so as not to be seen from the outside in the vehicle width direction.

As shown in fig. 2, the coupling member 8 extends from the support bracket 7 (see fig. 1) at the lower portion of the frame 20 to the engine-side pivot portion 5. The coupling member 8 extends from the support bracket 7 (see fig. 1) to a position forward of the catalytic converter 70. The coupling member 8 extends forward and upward from the engine-side pivot portion 5 in the side view of fig. 2 in the 1G state. The front end portion of the connecting member 8 is connected to the support bracket 7 (see fig. 1) via a shock absorbing member (not shown) such as a rubber damper and a vehicle body side pivot portion. The vehicle-body-side pivot portion is a pivot (swing shaft) extending in the vehicle width direction. Hereinafter, the center Pv of the vehicle-body-side pivot portion is also referred to as "vehicle-body-side pivot center Pv".

As shown in fig. 4, the connecting member 8 includes a pair of left and right connecting arms 8a and a cross member 8b extending in the vehicle width direction.

The connecting arm 8a extends forward and upward from the engine-side pivot portion 5.

The vehicle-widthwise outer end portion of the cross member 8b is connected to the front end portion of the connecting arm 8 a. The cross member 8b is formed in a tubular shape having a vehicle body side pivot center Pv (see fig. 2) as an axial center.

The catalytic converter 70 is provided in the middle of an exhaust pipe 80 connecting an exhaust port of the engine 11 and an exhaust muffler (not shown). An exhaust muffler (not shown) is disposed on the right side of the rear wheel 4 (see fig. 1). As shown in fig. 3, the exhaust pipe 80 includes: a first exhaust pipe 81 extending from an exhaust port of the engine 11 and connected to the catalytic converter 70; and a second exhaust pipe 82 extending from the catalytic converter 70 and connected to an exhaust muffler (not shown).

In the front view of fig. 3, the first exhaust pipe 81 extends forward and downward from the exhaust port of the engine 11 toward the front of the catalytic converter 70 and then curves and extends leftward. Then, the first exhaust pipe 81 extends in a bent manner rearward and downward toward the left side of the catalytic converter 70, and then extends inward in the vehicle width direction toward the left side of the catalytic converter 70. In the side view of fig. 2, the front end of the first exhaust pipe 81 is disposed rearward of the head-cover-side boundary line J2. In the side view of fig. 2, the entire first exhaust pipe 81 is disposed within a range H1 in the height direction of the cylinder head 41 b.

In the front view of fig. 3, the second exhaust pipe 82 extends rightward from the right side surface of the catalytic converter 70, then bends rearward and extends toward an exhaust muffler (not shown). In the front view of fig. 3, an upstream end portion (hereinafter also referred to as an "upstream end portion") of the second exhaust pipe 82 in the flow direction of the exhaust gas is opposed to a downstream end portion (hereinafter also referred to as a "downstream end portion") of the first exhaust pipe 81 in the flow direction of the exhaust gas with the catalytic converter 70 interposed therebetween.

The entire catalytic converter 70 is disposed within a vehicle width direction range W1 of the crankcase 40 in front view. Here, the range W1 in the vehicle width direction of the crankcase 40 is a range between a boundary line K1 (hereinafter also referred to as "transmission-case-side boundary line K1") between the left end of the crankcase 40 and the transmission case 50 and a boundary line K2 (hereinafter also referred to as "generator-case-side boundary line K2") between the right end of the crankcase 40 and the generator case 55.

An arrangement space of the first exhaust pipe 81 is provided between a left side surface of the catalytic converter 70 and a transmission case side boundary line K1. The left end of the first exhaust pipe 81 is disposed further inward in the vehicle width direction than the transmission case side boundary line K1 in a front view.

The second exhaust pipe 82 extends in the vehicle width direction across the generator case side boundary line K2 in front view. The second exhaust pipe 82 is gradually reduced in diameter from the vicinity of the generator case-side boundary line K2 to a predetermined range on the outer side in the vehicle width direction in front view.

The catalytic converter 70 overlaps the vehicle body left and right center line CL in a front view. The catalytic converter 70 extends in the vehicle width direction in front view. The catalytic converter 70 extends across the vehicle body left and right center line CL in the vehicle width direction in front view. The catalytic converter 70 is disposed between the lower surface of the cylinder 41 and the lower surface of the crankcase 40 in front view. The center axis C1 of the catalytic converter 70 is disposed between the lower surface of the cylinder head 41b and the vehicle body side pivot center Pv in front view. In the side view of fig. 2, the catalytic converter 70 overlaps with an extension of the block-side boundary line J1. In the side view of fig. 2, the center axis C1 of the catalytic converter 70 is arranged in the vicinity of the extension of the cylinder block side boundary line J1.

As shown in fig. 3, the catalytic converter 70 includes: a tubular converter main body 71 extending in the vehicle width direction; and a catalyst body 72 provided inside the converter main body 71. A downstream end portion of the first exhaust pipe 81 as an exhaust gas introduction pipe is connected to a left end portion of the converter main body 71. An upstream end portion of a second exhaust pipe 82, which is an exhaust pipe for exhaust gas that passes through the catalyst body 72, is connected to a right end portion of the converter main body 71.

For example, the catalyst body 72 is constituted by a porous honeycomb structure (honeycomb type three-way catalyst) coated with platinum, palladium, rhodium, or the like. The catalyst body 72 is not limited to the honeycomb three-way catalyst, and may be formed of a heat pipe in which platinum, palladium, rhodium, or the like is supported on a punched pipe.

The exhaust gas discharged from the exhaust port of the engine 11 enters the interior of the catalytic converter 70 through the first exhaust pipe 81. The exhaust gas introduced into the catalytic converter 70 is oxidized and reduced to remove hydrocarbons, carbon monoxide, and nitrogen oxides from the exhaust gas. The exhaust gas passes through the second exhaust pipe 82 and is discharged to an exhaust muffler (not shown).

Fig. 5 is a left side view of the periphery including the catalytic converter 70 when the engine-side pivot portion 5 is at the lowermost position due to the swing. Here, the case where the engine side pivot shaft portion 5 is at the lowermost position due to the swing refers to a case where the engine side pivot shaft portion 5 is moved lowermost and closest to the ground due to the swing (hereinafter, also referred to as "closest state").

As shown in fig. 5, the cylinder 41 in the closest state obliquely protrudes more gently upward in a side view from the front end portion of the crankcase 40 than the cylinder 41 in the 1G state (see fig. 2). The cylinder 41 in the closest state protrudes from the front end of the crankcase 40 at an inclination closer to the horizontal than the cylinder 41 in the 1G state (see fig. 2) in the side view.

The upper end of the extension portion 60 in the closest state extends rearward and upward from the engine-side pivot portion 5 in side view. The upper end of the extension portion 60 in the closest state extends more sharply upward and rearward from the engine-side pivot portion 5 than the upper end of the extension portion 60 in the 1G state (see fig. 2) in a side view.

The connecting member 8 in the closest state extends forward and upward from the engine-side pivot portion 5 in side view. The coupling member 8 in the closest state extends forward and upward from the engine-side pivot portion 5 at substantially the same inclination as the coupling member 8 in the 1G state (see fig. 2) in a side view.

The coupling member 8 in the closest state is closer to the exhaust pipe 80 (first exhaust pipe 81) than the coupling member 8 in the 1G state (see fig. 2). In the present embodiment, the engine-side pivot portion 5 is disposed in front of the catalytic converter 70, and thus the amount of the connecting member 8 in the closest state approaching the exhaust pipe 80 is reduced as much as possible, and the degree of freedom in layout is improved.

< Effect >

As described above, the motorcycle 1 of the above embodiment includes the engine side pivot shaft portion 5 disposed below the cylinder 41 of the engine 11, the extending portion 60 extending from the crankcase 40 of the engine 11 to the engine side pivot shaft portion 5, the connecting member 8 connecting the frame 20 and the engine side pivot shaft portion 5, and the catalytic converter 70 disposed between the cylinder 41 and the connecting member 8, wherein the entire engine side pivot shaft portion 5 is disposed in front of the catalytic converter 70, and the entire catalytic converter 70 is disposed within the vehicle width direction W1 of the crankcase 40 as viewed from the front-rear direction.

According to this configuration, since all of the engine side pivot portion 5 is disposed in front of the catalytic converter 70, it is possible to suppress the coupling member 8 from approaching the catalytic converter 70 too much during the swing, compared to the case where the engine side pivot portion 5 is disposed behind the catalytic converter 70. Further, since all of the catalytic converter 70 is disposed within the vehicle width direction range W1 of the crankcase 40 as viewed from the front-rear direction, the catalytic converter 70 can be suppressed from protruding outward in the vehicle width direction as compared to the case where the catalytic converter 70 is disposed outside the vehicle width direction range of the crankcase 40 as viewed from the front-rear direction. Therefore, it is possible to suppress the catalyst converter 70 from protruding outward in the vehicle width direction while suppressing interference between the catalyst converter 70 and the connecting member 8. Further, the extension 60 extends from the crankcase 40, and thus the extension 60 can be shortened as compared with the case where the extension 60 extends from another place.

In the above embodiment, the extending portion 60 has the recess 61 recessed outward in the vehicle width direction from the vehicle width direction inner side surface 60a of the extending portion 60, and the following effects are obtained.

The recess 61 can reduce the weight of the extension 60. Further, the recessed portion 61 can be made less visible from the outside in the vehicle width direction than in the case where the recessed portion 61 is recessed inward in the vehicle width direction from the vehicle width direction outer side surface 60b of the extending portion 60.

In the above embodiment, the connecting member 8 extends forward and upward from the engine-side pivot portion 5 as viewed in the vehicle width direction, and thereby the following effects are obtained.

Compared to the case where the connecting member 8 extends forward and downward from the engine-side pivot portion 5 when viewed in the vehicle width direction, the connecting member 8 can be prevented from approaching the ground too much during swinging. Therefore, interference between the coupling member 8 and the ground can be suppressed.

In the above embodiment, the upper end of the extending portion 60 extends rearward and upward from the engine-side pivot portion 5 as viewed in the vehicle width direction, thereby achieving the following effects.

The rigidity of the extension portion 60 can be improved as compared with a case where the extension portion 60 extends rearward from the engine-side pivot portion 5 with the same vertical width as viewed in the vehicle width direction.

In the above embodiment, the extending portion 60 extending from the crankcase 40 extends to the front of the catalytic converter 70, and the connecting member 8 connected to the frame 20 extends to the front of the catalytic converter 70, thereby achieving the following effects.

As compared with the case where the extension portion 60 extending from the crankcase 40 extends to the rear of the catalytic converter 70 and the connecting member 8 connected to the frame 20 extends to the rear of the catalytic converter 70, the length of the connecting member 8 can be reduced, and therefore the connecting member 8 can be made lightweight. Further, since the swing range of the coupling member 8 does not increase more than necessary, interference between the coupling member 8 and the ground can be suppressed.

In the above embodiment, the engine side pivot shaft portion 5 extends in the vehicle width direction, the pair of left and right extending portions 60 are provided, and the engine side pivot shaft portion 5, the pair of left and right extending portions 60, and the crankcase 40 constitute the closed cross-sectional structure 65, thereby achieving the following effects.

The rigidity of the structure (closed cross-sectional structure 65) including the engine-side pivot portion 5, the pair of left and right extending portions 60, and the crankcase 40 can be improved as compared with the case where the engine-side pivot portion 5, the pair of left and right extending portions 60, and the crankcase 40 constitute an open cross-sectional structure. As described above, the extending portion 60 extends from the crankcase 40, and thus there is a demand for improvement in rigidity, but the rigidity can be improved by forming the closed cross-sectional structure 65.

In the above embodiment, the longitudinal direction of the catalytic converter 70 is along the vehicle width direction, and the following effects are obtained.

As compared with the case where the longitudinal direction of the catalytic converter 70 is along the direction intersecting the vehicle width direction, the catalytic converter 70 is easily disposed in the vicinity of the crankcase 40 while being disposed at W1 within the vehicle width direction of the crankcase 40, and therefore the catalytic converter 70 can be disposed more compactly.

In the above embodiment, the lower surface 60c of the extending portion 60 is formed in a planar shape along the direction in which the extending portion 60 extends, thereby providing the following effects.

The distance between the extension portion 60 and the ground can be increased as compared with the case where a part of the lower surface 60c of the extension portion 60 protrudes downward. Therefore, interference of the extension portion 60 with the ground can be suppressed.

< modification example >

In the above embodiment, the description has been given taking an example in which all of the engine-side pivot portion 5 is disposed in front of the catalytic converter 70, but the present invention is not limited to this. For example, only a part of the engine side pivot portion 5 may be disposed in front of the catalytic converter 70. For example, at least a part of the engine side pivot portion 5 may be disposed in front of the catalytic converter 70. For example, the engine-side pivot center Pe may be disposed forward of the center axis C1 of the catalytic converter 70. For example, the arrangement of the engine-side pivot portion 5 may be changed according to the required specifications.

In the above embodiment, the description has been given taking the example in which all of the catalytic converter 70 is disposed within the vehicle width direction range W1 of the crankcase 40 as viewed from the front-rear direction, but the present invention is not limited to this. For example, only a part of the catalytic converter 70 may be disposed within the vehicle width direction W1 of the crankcase 40 as viewed from the front-rear direction. For example, at least a part of the catalytic converter 70 may be disposed within the vehicle width direction W1 of the crankcase 40 as viewed from the front-rear direction.

In the above embodiment, the description has been given of the example in which the extending portion 60 has the recessed portion 61 recessed outward in the vehicle width direction from the vehicle width direction inner side surface 60a of the extending portion 60, but the present invention is not limited to this. For example, the recessed portion 61 may be recessed inward in the vehicle width direction from the vehicle width direction outer side surface 60b of the extending portion 60. For example, the extension 60 may not have the recess 61. For example, the form of the extension portion 60 may be changed according to the required specification.

In the above embodiment, the example in which the connecting member 8 extends forward and upward from the engine-side pivot portion 5 as viewed in the vehicle width direction has been described, but the present invention is not limited to this. For example, the connecting member 8 may extend forward from the engine-side pivot portion 5 as viewed in the vehicle width direction. For example, the connecting member 8 may extend from the engine-side pivot portion 5 toward the front lower side as viewed in the vehicle width direction in at least one of the 1G state and the closest state.

In the above embodiment, the example in which the upper end of the extending portion 60 extends rearward and upward from the engine-side pivot portion 5 as viewed in the vehicle width direction has been described, but the present invention is not limited to this. For example, the upper end of the extending portion 60 may extend rearward from the engine-side pivot portion 5 as viewed in the vehicle width direction. For example, the upper end of the extending portion 60 may extend rearward and downward from the engine-side pivot portion 5 in at least one of the 1G state and the closest state as viewed in the vehicle width direction.

In the above embodiment, the description has been given of the example in which the extending portion 60 extending from the crankcase 40 extends to the front of the catalytic converter 70, and the coupling member 8 coupled to the frame 20 extends to the front of the catalytic converter 70, but the present invention is not limited to this. For example, the extending portion 60 extending from the crankcase 40 may extend to the rear of the catalytic converter 70, and the connecting member 8 connected to the frame 20 may extend to the rear of the catalytic converter 70. For example, the length of extension of the extension portion 60 and the length of extension of the connecting member 8 may be changed according to the required specifications.

In the above embodiment, the description has been given of the example in which the engine side pivot shaft portion 5 extends in the vehicle width direction, the pair of left and right extending portions 60 are provided, and the engine side pivot shaft portion 5, the pair of left and right extending portions 60, and the crankcase 40 constitute the closed cross-sectional structure 65, but the present invention is not limited thereto. For example, the engine-side pivot shaft portion 5, the pair of right and left extending portions 60, and the crankcase 40 may have an open cross-sectional structure. For example, the engine-side pivot shaft portion 5 is not limited to a single pivot shaft extending in the vehicle width direction, and may be a pair of left and right pivot shafts provided with a gap in the vehicle width direction. For example, the form of the engine side pivot portion 5 may be changed according to the required specification.

In the above embodiment, the description has been given taking the example in which the longitudinal direction of the catalytic converter 70 is along the vehicle width direction, but the present invention is not limited to this. For example, the longitudinal direction of the catalytic converter 70 may be along a direction intersecting the vehicle width direction. For example, the arrangement of the catalytic converter 70 may be changed according to the required specifications.

In the above embodiment, the example in which the lower surface 60c of the extending portion 60 is formed in a planar shape along the direction in which the extending portion 60 extends has been described, but the present invention is not limited to this. For example, a part of the lower surface 60c of the extension 60 may protrude downward. For example, the shape of the extension portion 60 may be changed according to a required specification.

In the above embodiment, the example in which the connecting member 8 linearly extends from the engine-side pivot portion 5 toward the vehicle-body-side pivot portion in a side view has been described, but the present invention is not limited to this. For example, as shown in fig. 6, the coupling member 108 may extend in a curved manner in the front-downward direction from the engine-side pivot portion 5 to the vehicle-body-side pivot portion in a side view. Thus, the connecting member 108 can be more effectively prevented from approaching the exhaust pipe 80 too much during swinging, as compared with the case where the connecting member 8 linearly extends from the engine-side pivot portion 5 toward the vehicle-body-side pivot portion in a side view. Therefore, interference between the connecting member 108 and the exhaust pipe 80 can be more effectively suppressed.

In the above embodiment, the engine 11 is described as an example of a single cylinder engine, but the present invention is not limited to this. For example, the engine 11 may be a multi-cylinder engine. For example, the form of the engine 11 may be changed according to the required specifications.

In the above embodiment, the unit swing type motorcycle 1 as an example of the saddle type vehicle is described as an example, but the present invention is not limited to this. For example, a motorcycle other than the unit swing type (for example, a motorcycle having an engine mounted on a vehicle body side) may be used.

In the above embodiment, the transmission 15 is described as including the drive pulley 51, the driven pulley 52, and the V-belt 53, but the present invention is not limited thereto. For example, the transmission 15 may include a member capable of performing other power transmission such as gear transmission and chain transmission. For example, the form of the transmission 15 may be changed according to the required specifications.

In the above embodiment, the configuration in which the transmission 15 transmits the driving force of the engine 11 to the rear wheels 4 is taken as an example and described, but the present invention is not limited to this. For example, the transmission 15 may transmit the driving force of the engine 11 to the front wheels 3. For example, the mode of transmitting the driving force of the engine 11 to the driving wheels may be changed according to the required specification.

The present invention is not limited to the above-described embodiments, and examples of the straddle-type vehicle include all vehicles in which a driver rides straddling a vehicle body, including vehicles having not only motorcycles (including bicycles with prime movers and scooter-type vehicles) but also three wheels (including front-wheel and rear-wheel vehicles in addition to front-wheel and rear-wheel vehicles). The present invention is applicable not only to motorcycles but also to four-wheeled vehicles such as automobiles.

The configuration in the above embodiment is an example of the present invention, and the components of the embodiment may be replaced with known components, and various modifications may be made without departing from the scope of the present invention.

Claims (6)

1. A saddle-ride type vehicle in which, in a saddle-ride type vehicle,

the straddle-type vehicle is provided with:

a pivot portion (5) disposed below a cylinder (41) of an engine (11);

an extension portion (60) that extends from a crankcase (40) of the engine (11) to the pivot portion (5);

a connecting member (8) that connects the frame (20) and the pivot portion (5); and

a catalyst (70) disposed between the cylinder (41) and the connecting member (8),

at least a part of the pivot portion (5) is disposed in front of the catalyst (70),

at least a part of the catalyst (70) is disposed in a vehicle width direction range (W1) of the crankcase (40) when viewed from the front-rear direction.

2. The straddle-type vehicle according to claim 1, wherein,

the extending portion (60) has a recessed portion (61) recessed outward in the vehicle width direction from a vehicle width direction inner side surface (60a) of the extending portion (60).

3. The straddle-type vehicle according to claim 1 or 2, wherein,

the connecting member (8) extends upward and forward from the pivot portion (5) when viewed in the vehicle width direction.

4. The straddle-type vehicle according to claim 1 or 2, wherein,

the upper end of the extension portion (60) extends rearward and upward from the pivot portion (5) when viewed in the vehicle width direction.

5. The straddle-type vehicle according to claim 1 or 2, wherein,

the extension (60) extending from the crankcase (40) extends to a position forward of the catalyst (70),

the connecting member (8) connected to the vehicle frame (20) extends to a position forward of the catalyst (70).

6. The straddle-type vehicle according to claim 1 or 2, wherein,

the pivot portion (5) extends in the vehicle width direction,

the extension part (60) is provided with a left and right pair,

the pivot portion (5), the pair of right and left extending portions (60), and the crankcase (40) constitute a closed cross-sectional structure (65).

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