JP7172290B2 - motorcycle - Google Patents

Description

The present invention relates to a motorcycle equipped with a catalyst for purifying exhaust gas.

Conventionally, a motorcycle has an exhaust pipe through which exhaust gas discharged from an exhaust port of an engine flows, and a catalyst for purifying the exhaust gas is provided in the exhaust pipe. 2. Description of the Related Art In recent years, in order to comply with exhaust gas regulations, it is required to improve the purification performance of catalysts for exhaust gas. In order to meet such demands, it is important to arrange the catalyst as upstream as possible in the exhaust pipe, and for that reason, the catalyst is sometimes arranged in front of the engine.

For example, Patent Literature 1 discloses that at least part of the catalyst is positioned forward of the crankcase when viewed from the side of the vehicle.

JP 2017-114394 A

During engine operation, the catalyst becomes very hot. Therefore, when the catalyst is placed in front of the engine as described above, care must be taken so that the rider's riding comfort is not degraded by the heat of the catalyst. In particular, in models in which the footrest is arranged in front of the engine (for example, a cruiser type), if the rider's legs placed on the footrest are exposed to the heat of the catalyst, the rider's riding comfort may be deteriorated. On the other hand, if the footrests are shifted to the outside in the left and right direction than usual in order to keep the rider's feet placed on the footrests away from the catalyst, there is a risk that the riding position will be affected.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to secure an appropriate riding position in a motorcycle in which a catalyst is arranged in front of an engine, while suppressing deterioration in riding comfort of the rider due to the heat of the catalyst.

A motorcycle according to the present invention includes an engine, a muffler into which exhaust gas from the engine flows, an exhaust pipe connecting an exhaust port of the engine and the muffler, and a muffler provided in the exhaust pipe. a catalyst disposed forward; a footrest and a brake pedal at least partially disposed forward of the engine ; a footrest bracket to which the footrest is attached; a pedal mounting portion to which the brake pedal is mounted , wherein the footrest and the brake pedal are arranged so that their longitudinal positions at least partially overlap with the catalyst; An upstream connecting pipe connecting the exhaust port and the upper end of the catalyst; a downstream connecting pipe connecting the lower end of the catalyst and the muffler; a catalyst cover that covers the catalyst, the upstream connection pipe, and the downstream connection pipe , wherein the pedal mounting portion is positioned below a lower end portion of the catalyst and faces the downstream connection pipe; and the downstream connecting pipe is offset inward in the left-right direction with respect to the central axis of the catalyst .

Advantageous Effects of Invention According to the present invention, in a motorcycle in which a catalyst is arranged in front of an engine, it is possible to secure an appropriate riding position while suppressing deterioration of rider's riding comfort due to heat of the catalyst.

1 is a right side view showing a motorcycle according to one embodiment of the present invention; FIG. 1 is a right side view showing an engine and its surroundings according to an embodiment of the present invention; FIG. 1 is a front view showing an engine and its surroundings according to an embodiment of the present invention; FIG. 1 is a perspective view showing an engine and its surroundings according to an embodiment of the present invention; FIG. 1 is a right side view showing part of an exhaust system according to an embodiment of the present invention; FIG. 1 is a perspective view showing a brake pedal and its periphery according to an embodiment of the present invention; FIG.

In one embodiment of the present invention, a catalyst cover that covers the catalyst, the upstream connecting pipe, and the downstream connecting pipe is arranged inside the space right above the footrest in the left-right direction. By adopting such a configuration, the rider's feet placed on the footrest can be protected from the heat of the catalyst by the catalyst cover. Therefore, it is possible to suppress deterioration of riding comfort of the rider due to the heat of the catalyst.

In addition, since the catalyst cover can protect the rider's feet from the heat of the catalyst as described above, the footrests are shifted outward in the left and right direction to keep the rider's feet placed on the footrests away from the catalyst. No need. Therefore, an appropriate riding position can be secured.

(Motorcycle 1)
A cruiser-type motorcycle 1 according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 6. FIG. Hereinafter, terms indicating directions such as front and rear, left and right, and up and down are used based on the direction viewed from the rider of the motorcycle 1 . Arrows Fr, Rr, L, R, U, and Lo appropriately attached to each figure indicate the front, rear, left, right, upper, and lower directions of the motorcycle 1, respectively.

1 and 2, a motorcycle 1 includes a body frame 2, a steering mechanism 3 and a front wheel 4 arranged in front of the body frame 2, a fuel tank 5 arranged above the body frame 2 and a A rider seat 6, a pair of left and right swing arms 7 and a rear wheel 8 arranged at the rear lower side of the body frame 2, an engine 9 supported by the body frame 2, an intake device 11 and an exhaust device connected to the engine 9. 12, a starter motor 13 arranged in front of the engine 9, a pair of left and right footrest brackets 14 and a pair of left and right footrests 15 arranged in front and below the engine 9, and a footrest guard 16 attached to the footrest bracket 14 on the right side. , a brake pedal 17 , a brake cylinder 18 , a brake switch 19 and a heat guard 20 . Each of the above components will be described in order below.

(Car body frame 2)
1 to 3, the body frame 2 includes a head pipe 21, one main frame 22 extending rearward from the head pipe 21, one down frame 23 extending downward from the head pipe 21, A pair of left and right side frames 24 extending downward while bifurcating from the rear end of the main frame 22 and a pair of left and right seat rails 25 extending rearward from the rear portion of the main frame 22 are mainly configured.

The down frame 23 is arranged in front of the engine 9 . The down frame 23 linearly extends in the vertical direction when viewed from the side of the vehicle and from the front of the vehicle. As viewed from the front of the vehicle, the down frame 23 is arranged so as to overlap the center line M in the left-right direction of the vehicle over the entire area from the upper end to the lower end.

3 and 4, an engine suspension bracket 28 is arranged on the lower end side of the down frame 23. As shown in FIG. Left and right side portions of the upper portion of the engine suspension bracket 28 are attached to the lower end portion of the down frame 23 via a pair of upper and lower bolts B1.

A connection member 29 is attached to the lower portion of the engine suspension bracket 28 . The connection member 29 includes a pair of left and right connection brackets 29a that are joined to the left and right sides of the lower portion of the engine suspension bracket 28, and a connection pipe 29b that extends in the left and right direction and is joined to the lower ends of the pair of left and right connection brackets 29a. and a pair of left and right connection plates 29c extending in the front-rear direction and joined to the left and right ends of the connection pipe 29b. The lower side of the connecting member 29 is covered with an under cowl 30 (see FIG. 1).

(Steering mechanism 3 and front wheel 4)
Referring to FIG. 1, steering mechanism 3 is rotatably supported by head pipe 21 . The steering mechanism 3 includes a handle device 31 and a pair of left and right front forks 32 . The front wheel 4 is rotatably supported at the lower ends of the pair of left and right front forks 32 .

(Fuel tank 5 and rider seat 6)
Referring to FIG. 1, fuel tank 5 is supported by main frame 22 . The rider seat 6 is arranged behind the fuel tank 5 and supported by a pair of left and right seat rails 25 .

(A pair of left and right swing arms 7 and rear wheels 8)
Referring to FIG. 1 , the front ends of the pair of left and right swing arms 7 are connected to the pair of left and right side frames 24 via pivot shafts 35 . As a result, the pair of left and right swing arms 7 can swing around the pivot shaft 35 . A rear wheel 8 is rotatably supported at the rear ends of the pair of left and right swing arms 7 . A brake lamp 40 is provided above the rear wheel 8 .

(Engine 9)
2 to 4, engine 9 is, for example, an air-cooled single-cylinder engine. The engine 9 includes a crankcase 41, a cylinder 42 connected to the crankcase 41 from above, a cylinder head 43 connected to the cylinder 42 from above, a cylinder head cover 44 connected to the cylinder head 43 from above, a crank A clutch cover 45 (an example of a cover) that covers the right side (outside in the left-right direction) of the case 41 and a magneto cover 46 that covers the left side (outside in the left-right direction) of the crankcase 41 are provided.

Referring to FIG. 2, the left and right sides of the front end of crankcase 41 are attached to the lower left and right sides of engine suspension bracket 28 via a pair of upper and lower bolts B2 (only the lower bolt B2 is shown in FIG. 2). attached to the part. Thereby, the front end portion of the crankcase 41 is fixed to the lower end portion of the down frame 23 via the engine suspension bracket 28 .

A crankshaft 51 is housed in the front portion of the crankcase 41 . The crankshaft 51 is rotatably provided around a rotation axis R1 extending in the left-right direction. A clutch mechanism 54 is provided on the right side (left-right direction outer side) of the right side surface of the crankcase 41 . The clutch mechanism 54 is covered from the right side (left-right direction outer side) by a clutch cover 45 . The clutch mechanism 54 is connected to the crankshaft 51 via a primary speed reduction mechanism (not shown).

Referring to FIG. 3 , a magneto 55 for power generation is provided on the left side (outside in the left-right direction) of the left side surface of crankcase 41 . The magneto 55 is covered from the left side (outside in the left-right direction) by a magneto cover 46 . The magneto 55 is fixed to the left end of the crankshaft 51 (see FIG. 2).

Referring to FIG. 2, cylinder 42 accommodates a piston (not shown). The piston is connected to the crankshaft 51 via a connecting rod (not shown). A combustion chamber 58 is provided above the piston between the cylinder 42 and the cylinder head 43 . An intake port 59 that communicates with the combustion chamber 58 is provided in the rear wall portion of the cylinder head 43 . An exhaust port 60 communicating with the combustion chamber 58 is provided in the front wall portion of the cylinder head 43 . A spark plug 61 is attached to the right wall portion of the cylinder head 43 .

(Intake device 11)
Referring to FIG. 2 , intake device 11 includes an intake pipe 71 and an air cleaner (not shown) connected to intake pipe 71 . The intake pipe 71 is connected to the intake port 59 of the engine 9 .

(Exhaust device 12)
Hereinafter, in the description of the exhaust system 12, when describing "upstream side" or "downstream side", the "upstream side" or "downstream side" in the exhaust direction (flow direction of exhaust gas) in the exhaust system 12 is used. show.

2 to 4, the exhaust system 12 includes a catalyst 81 arranged in front of the engine 9, and an upstream catalyst connecting an exhaust port 60 of the engine 9 and an upper end (upstream end) of the catalyst 81. A side connection pipe 83, a muffler 84 arranged behind the engine 9, a downstream side connection pipe 85 connecting the muffler 84 to the lower end (downstream end) of the catalyst 81, and the catalyst 81 are accommodated. and a catalyst cover 86 .

The upstream connection pipe 83 , the downstream connection pipe 85 , and the catalyst cover 86 constitute an exhaust pipe 87 that connects the exhaust port 60 of the engine 9 and the silencer 84 . In other words, the exhaust pipe 87 includes an upstream connecting pipe 83 , a downstream connecting pipe 85 and a catalyst cover 86 .

(Catalyst 81 of exhaust device 12)
2 to 4, the catalyst 81 of the exhaust system 12 is arranged inside the exhaust pipe 87. As shown in FIG. The catalyst 81 is composed of, for example, a three-way catalyst with a honeycomb structure. The catalyst 81 purifies the exhaust gas by converting harmful components (eg, carbon monoxide, hydrocarbons, nitrogen oxides) in the exhaust gas into harmless components (eg, carbon dioxide, water, nitrogen) through a chemical reaction. do.

The catalyst 81 has a cylindrical shape. The catalyst 81 is provided with the same diameter from the upper end (upstream end) to the lower end (downstream end). When viewed from the side of the vehicle and from the front of the vehicle, the catalyst 81 extends linearly in the vertical direction and is arranged parallel to the down frame 23 .

Referring to FIG. 2, a portion of catalyst 81 overlaps the lower end portion of down frame 23 as viewed from the side of the vehicle. As viewed from the side of the vehicle, the upper end (upstream end) of the catalyst 81 is located above the extension line E of the mating surface Y between the crankcase 41 and the cylinder 42 . The lower end (downstream end) of the catalyst 81 is located at substantially the same height as the rotation axis R1 of the crankshaft 51 .

Referring to FIG. 3, catalyst 81 is arranged in front of mating surface X between crankcase 41 and clutch cover 45 . Therefore, when viewed from the front of the vehicle, the catalyst 81 overlaps the mating surface X between the crankcase 41 and the clutch cover 45 . The catalyst 81 is positioned at approximately the same height as the starter motor 13 . The right end of the catalyst 81 (outer end in the left-right direction) is positioned leftward (inner in the left-right direction) than the right end of the engine 9 (outer end in the left-right direction). That is, the catalyst 81 is accommodated within the width of the engine 9 in the left-right direction.

As viewed from the front of the vehicle, the catalyst 81 is arranged on the right side (left-right direction outer side) of the down frame 23 and the engine suspension bracket 28 with a gap therebetween. As viewed from the front of the vehicle, the catalyst 81 is provided at an intermediate position between the down frame 23 and the right footrest bracket 14 and is arranged equidistant from the down frame 23 and the right footrest bracket 14 . The catalyst 81 is spaced apart from the right footrest 15 and the brake pedal 17 and is arranged on the left side (left-right direction inner side) of the right footrest 15 and the brake pedal 17 .

(Upstream side connecting pipe 83 of exhaust device 12)
Referring to FIG. 3, an upstream connection pipe 83 of exhaust system 12 extends from the upper end (upstream end) of catalyst 81 toward the center of the vehicle in the left-right direction. The upstream connecting pipe 83 includes a first pipe 105 and a second pipe 106 provided on the lower right side (downstream side) of the first pipe 105 .

The first pipe 105 has a shape bent rightward (laterally outward) from the exhaust port 60 of the engine 9 so as to avoid the down frame 23 . The first pipe 105 has the same diameter from the upper left end (upstream end) to the lower right end (downstream end). As viewed from the front of the vehicle, the first pipe 105 is located within the width of the cylinder 42 and the cylinder head 43 in the left-right direction and within the height of the cylinder 42 and the cylinder head 43 . That is, the first pipe 105 is within the range of the cylinder 42 and the cylinder head 43 when viewed from the front of the vehicle.

Referring to FIG. 5, first pipe 105 is formed from a single unitary piece. That is, the first pipe 105 has an integral structure. A cylindrical boss 108 protrudes upward from the outer peripheral surface of the first pipe 105 . An exhaust gas sensor 109 is attached to the boss 108 so that its tip faces upward. Note that the exhaust gas sensor 109 is not shown in FIG.

Referring to FIG. 5, an annular joint 111 is fixed to the upper left end (upstream end) of the outer peripheral surface of first pipe 105 . The joint 111 is connected to an exhaust port 60 (see FIG. 2 and the like) of the engine 9 via a gasket (not shown).

Referring to FIG. 5, an annular flange 112 is attached to the outer peripheral surface of first pipe 105 between boss 108 and joint 111 . Flange 112 is not fixed to first pipe 105 and joint 111 . The flange 112 is fixed to the cylinder head 43 on the outer periphery of the exhaust port 60 (see FIG. 2 etc.) of the engine 9 .

Referring to FIG. 3, the second pipe 106 has a shape bent leftward (inward in the left-right direction) from the upper end (upstream end) of the catalyst 81 . The second pipe 106 expands in diameter from the upper left side (upstream side) toward the lower right side (downstream side).

Referring to FIG. 5, second pipe 106 is formed in a hollow shape by joining separately molded front portion 106a and rear portion 106b. That is, the second pipe 106 has a monaka structure. The second pipe 106 is divided into a front portion 106a and a rear portion 106b on a plane passing through the central axis C of the catalyst 81. As shown in FIG.

The upper left end (upstream end) of the second pipe 106 is attached to the lower right end (downstream end) of the first pipe 105 . The upper end (upstream end) of the catalyst 81 is inserted into the lower right end (downstream end) of the second pipe 106 .

(Muffler 84 of exhaust device 12)
Referring to FIG. 1, the muffler 84 of the exhaust device 12 includes a chamber 114 and a muffler 115 provided on the rear side (downstream side) of the chamber 114 . Silence chambers (not shown) are provided inside the chamber 114 and inside the muffler 115, respectively.

(Downstream connecting pipe 85 of exhaust device 12)
Referring to FIG. 3 , downstream connecting pipe 85 of exhaust system 12 extends from the lower end (downstream end) of catalyst 81 toward the center of the vehicle in the left-right direction. The downstream connecting pipe 85 includes a first tubular body 116 and a second tubular body 117 provided on the lower left side (downstream side) of the first tubular body 116 .

A diameter-reduced portion 118 whose diameter is reduced from the upper side (upstream side) toward the lower side (downstream side) is provided in the vertical center portion of the first tubular body 116 . The left edge (horizontal direction inner edge) of the reduced diameter portion 118 extends in the vertical direction, and the right edge (horizontal direction outer edge) of the reduced diameter portion 118 extends to the left when viewed from above to below. (Inward in the left-right direction). Therefore, the central portion and the lower portion of the first tubular body 116 in the vertical direction are not arranged coaxially with the central axis C of the catalyst 81, and are offset to the left (horizontal direction inner side) with respect to the central axis C of the catalyst 81. ing.

Referring to FIG. 5, first tubular body 116 is formed in a hollow shape by joining separately molded front portion 116a and rear portion 116b. That is, the first tubular body 116 has a monaka structure. The lower end (downstream end) of the catalyst 81 is inserted into the upper end (upstream end) of the first tubular body 116 .

3 and 4, second tubular body 117 is not covered with catalyst cover 86 and is exposed to the outside. The second tubular body 117 passes between the crankcase 41 and the clutch cover 45 of the engine 9 , the lower part of the engine suspension bracket 28 and the brake pedal 17 . The second tubular body 117 passes through the right side (left-right direction outer side) of the right connection bracket 29 a of the connection member 29 and above the connection pipe 29 b of the connection member 29 .

The front upper end (upstream end) of the second tubular body 117 is connected to the lower end (downstream end) of the first tubular body 116 . The rear lower end (downstream end) of the second tubular body 117 is connected to the chamber 114 of the muffler 84 .

(Catalyst cover 86 of exhaust device 12)
Referring to FIG. 2 , the front edge of catalyst cover 86 of exhaust device 12 is located forward of the front edge of down frame 23 . A rear edge portion of the catalyst cover 86 is located rearward of a rear edge portion of the down frame 23 . The catalyst cover 86 is arranged so as not to overlap the starter motor 13 when viewed from the side of the vehicle.

3 and 4, the catalyst cover 86 is arranged on the left side (laterally inside) of the space S directly above the right footrest 15 (the space where the rider's feet placed on the right footrest 15 are arranged). It is The catalyst cover 86 covers the catalyst 81, the first pipe 105 and the second pipe 106 of the upstream connection pipe 83, and the first pipe body 116 of the downstream connection pipe 85 above the lower end of the right footrest 15. ing. The upper end (upstream end) of the catalyst cover 86 is located upstream of the boss 108 of the first pipe 105 and downstream of the flange 112 . The lower end (downstream end) of the catalyst cover 86 coincides with the lower end (downstream end) of the first tubular body 116 .

The catalyst cover 86 is formed in a hollow shape by joining separately molded right and left portions 86a and 86b. That is, the catalyst cover 86 has a monaka structure. A circular through hole 120 is provided in the upper portion of the right portion 86 a of the catalyst cover 86 . The boss 108 of the first pipe 105 passes through the through hole 120 . A portion of the outer peripheral surface of the boss 108 is thereby covered with the right side portion 86 a of the catalyst cover 86 .

Referring to FIG. 5, the inner peripheral surface of catalyst cover 86 faces the outer peripheral surface of catalyst 81 with a space therebetween. 5, only the left side portion 86b of the catalyst cover 86 is shown, and the right side portion 86a of the catalyst cover 86 is not shown.

(starter motor 13)
Referring to FIG. 2, starter motor 13 is fixed to the front end of crankcase 41 . The starter motor 13 is arranged in front of the cylinder 42 and behind the down frame 23 . The starter motor 13 is arranged between the catalyst 81 and the cylinder 42 as viewed from the side of the vehicle. Starter motor 13 is connected to crankshaft 51 . When the engine 9 is started, the rotation of the starter motor 13 is transmitted to the crankshaft 51 so that the crankshaft 51 rotates.

(A pair of left and right footrest brackets 14)
2 to 4, the pair of left and right footrest brackets 14 are arranged on both sides of the down frame 23 in the left and right direction. The lower end of each footrest bracket 14 is attached to each connection plate 29c of the connection member 29 via a pair of front and rear bolts B3. Thereby, each footrest bracket 14 is connected to the engine suspension bracket 28 via the connection member 29 .

A footrest mounting portion 133 is joined to the lower portion of each footrest bracket 14 . The footrest mounting portion 133 protrudes outward in the left-right direction from the lower portion of each footrest bracket 14 . The footrest mounting portion 133 has a U shape that is open outward in the left-right direction.

A pedal mounting portion 134 is joined to the lower portion of the right footrest bracket 14 . The pedal attachment portion 134 protrudes leftward (inward in the left-right direction) from the lower portion of the right footrest bracket 14 . The pedal mounting portion 134 has a cylindrical shape and extends in the left-right direction. The pedal mounting portion 134 is located below the lower end portion of the catalyst 81 and faces the first tubular body 116 of the downstream connecting pipe 85 . The pedal attachment portion 134 is provided on the opposite side of the footrest attachment portion 133 joined to the lower portion of the right footrest bracket 14 with the lower portion of the right footrest bracket 14 therebetween.

The right footrest bracket 14 has an extension 135 that extends upward on the left side (left-right direction inner side) of the right footrest 15 . The extending portion 135 is arranged so as to partially overlap the catalyst 81 when viewed from the side of the vehicle. The extending portion 135 is arranged between the space S immediately above the right footrest 15 and the catalyst 81 . A pair of upper and lower cylinder mounting bosses 136 and a switch mounting plate 137 are joined to the upper portion of the extension portion 135 . Each cylinder mounting boss 136 and switch mounting plate 137 protrude leftward (inward in the left-right direction) from the upper portion of the extension portion 135 . Both front and rear ends of the switch mounting plate 137 are bent downward.

(A pair of left and right footrests 15)
2 to 4, the entire pair of left and right footrests 15 are arranged forward of the engine 9. As shown in FIG. The longitudinal position of the front portion of each footrest 15 overlaps the longitudinal position of the rear portion of the catalyst 81 . That is, each footrest 15 is arranged so that the position in the front-rear direction partially overlaps with the catalyst 81 .

An inner end portion of each footrest 15 in the left-right direction is attached to a footrest attachment portion 133 joined to a lower portion of each footrest bracket 14 via a support shaft 139 . Thus, each footrest 15 is attached to the engine suspension bracket 28 via each footrest bracket 14 and connecting member 29 .

(Footrest guard 16)
2 to 4, the front portion of the footrest guard 16 is arranged between the space S immediately above the right footrest 15 and the catalyst 81. As shown in FIG. The footrest guard 16 is arranged so as to partially overlap the catalyst 81 as viewed from the side of the vehicle. The rear portion of the footrest guard 16 is attached to the rear portion of the right footrest bracket 14 via a pair of upper and lower bolts B4.

(brake pedal 17)
2 to 4, the entire brake pedal 17 is arranged forward of the engine 9. As shown in FIG. The longitudinal position of the rear portion of the brake pedal 17 overlaps the longitudinal position of the catalyst 81 . That is, the brake pedal 17 is arranged so that the position in the front-rear direction partially overlaps with the catalyst 81 .

Referring to FIG. 6, the brake pedal 17 includes a shaft portion 145, an arm portion 146 extending forward and upward from the shaft portion 145, a projection 147 projecting rearward and upward from the shaft portion 145, and an arm portion. 146, and an operated portion 149 extending from the front upper end portion of the arm portion 146 toward the right side (left-right direction outer side).

A shaft portion 145 of the brake pedal 17 has a cylindrical shape and extends in the left-right direction. The shaft portion 145 is attached to the outer periphery of the pedal attachment portion 134 on the left side (left-right direction inner side) of the right footrest bracket 14 . Thereby, the brake pedal 17 is rotatably attached to the footrest bracket 14 via the pedal attachment portion 134 . A spring mounting portion 148 of the brake pedal 17 is connected to the rear end portion of the switch mounting plate 137 via a first coil spring 151 .

Referring to FIG. 2, when viewed from the side of the vehicle, the center point of the upper surface of the operated portion 149 of the brake pedal 17 (the surface operated by the rider's foot) and the upper surface of the right footrest 15 (the surface on which the rider's foot is placed) ) (a straight line along the rider's shoe sole) passes through the catalyst 81 and the catalyst cover 86 .

(brake cylinder 18)
2 and 3, the brake cylinder 18 is arranged forward of the engine 9. As shown in FIG. The front portion of the brake cylinder 18 is arranged between the space S directly above the right footrest 15 and the catalyst 81 . When viewed from the side of the vehicle, the brake cylinder 18 is arranged so as to partially overlap the catalyst 81 . Note that the brake cylinder 18 is not shown in FIG.

Referring to FIG. 6, the brake cylinder 18 is attached to each cylinder attachment boss 136 via a pair of upper and lower bolts B5. Thereby, the brake cylinder 18 is attached to the extending portion 135 of the right footrest bracket 14 via each cylinder attachment boss 136 .

A piston rod (not shown) is housed in the brake cylinder 18 . The piston rod is connected to the protrusion 147 of the brake pedal 17. As shown in FIG. Brake cylinder 18 is connected to reservoir tank 154 via hose 153 .

(brake switch 19)
2 and 3, the brake switch 19 is arranged forward of the engine 9. As shown in FIG. The brake switch 19 is arranged between the space S directly above the right footrest 15 and the catalyst 81 . When viewed from the side of the vehicle, the brake switch 19 is arranged so as to partially overlap the catalyst 81 . Note that the brake switch 19 is not shown in FIG.

Referring to FIG. 6, brake switch 19 is attached to the rear of switch mounting plate 137 . Thus, the brake switch 19 is attached to the extending portion 135 of the right footrest bracket 14 via the switch mounting plate 137 . The brake switch 19 is connected to the spring mounting portion 148 of the brake pedal 17 via a second coil spring 158 .

(Heat guard 20)
2 to 4, heat guard 20 extends vertically. The heat guard 20 is arranged forward of the engine 9 . As viewed from the side of the vehicle, the heat guard 20 is arranged so as to partially overlap the catalyst 81 . The heat guard 20 is arranged between the space S directly above the right footrest 15 and the catalyst 81 . Heat guard 20 is arranged between catalyst 81 and brake switch 19 .

The lower portion of heat guard 20 is joined to the rear portion of switch mounting plate 137 . As a result, the heat guard 20 is attached to the extending portion 135 of the right footrest bracket 14 via the switch mounting plate 137 .

(Engine 9 exhaust)
Exhaust gas is discharged from an exhaust port 60 of the engine 9 when the engine 9 is driven. Exhaust gas discharged from the exhaust port 60 of the engine 9 passes through the first pipe 105 and the second pipe 106 of the upstream connection pipe 83 in order, flows into the catalyst 81 , and is purified by the catalyst 81 . The exhaust gas purified by the catalyst 81 sequentially passes through the first tubular body 116 and the second tubular body 117 of the downstream connecting pipe 85 and flows into the chamber 114 of the muffler 84 . The exhaust gas that has flowed into the chamber 114 of the muffler 84 passes through the chamber 114 of the muffler 84 and the muffler 115 in sequence and is discharged to the rear of the vehicle.

(Brake of rear wheel 8)
When the rider depresses the operated portion 149 of the brake pedal 17 downward while the vehicle is running, the brake pedal 17 rotates clockwise around the shaft portion 145 when viewed from the right side. Along with this, the projection 147 of the brake pedal 17 rises, the piston rod (not shown) accommodated in the brake cylinder 18 is pushed up by the projection 147 of the brake pedal 17, and the hydraulic pressure in the brake cylinder 18 rises. do. Along with this, a braking device (not shown) provided on the rear wheel 8 is activated, and the rear wheel 8 is braked.

Further, when the brake pedal 17 rotates clockwise about the shaft portion 145 as viewed from the right side as described above, the brake pedal 17 pulls the brake switch 19 downward via the second coil spring 158 . Along with this, the brake switch 19 is actuated and the brake lamp 40 is lit.

(effect)
In this embodiment, the catalyst 81 and the upstream connecting pipe 83 are provided on the left side (inside in the left-right direction) of the space S directly above the right footrest 15 (the space where the rider's feet placed on the right footrest 15 are arranged). A catalyst cover 86 is arranged to cover the first pipe 105 and the second pipe 106 and the first tubular body 116 of the downstream connecting pipe 85 . By adopting such a configuration, the rider's feet placed on the right footrest 15 can be protected from the heat of the catalyst 81 by the catalyst cover 86 . Therefore, it is possible to prevent the heat of the catalyst 81 from deteriorating the riding comfort of the rider.

In addition, since the catalyst cover 86 can protect the rider's feet from the heat of the catalyst 81 as described above, the right footrest 15 is moved more than usual to keep the rider's feet placed on the right footrest 15 away from the catalyst 81 . Also, there is no need to displace it to the right side (outside in the left-right direction). Therefore, an appropriate riding position can be secured.

The pedal mounting portion 134 is located below the lower end of the catalyst 81 and faces the first tubular body 116 of the downstream connecting pipe 85. The first tubular body 116 of the downstream connecting pipe 85 is The center axis C of the catalyst 81 is offset to the left (inward in the left-right direction). By adopting such a configuration, the gap between the pedal mounting portion 134 and the first tubular body 116 of the downstream connecting pipe 85 can be adjusted without arranging the pedal mounting portion 134 shifted to the right side (left-right direction outer side) than usual. can be sufficiently ensured. Therefore, it is not necessary to displace the right footrest 15 and the brake pedal 17 to the right side (outer in the left-right direction) than usual, and an appropriate riding position can be secured.

The right footrest bracket 14 has an extension portion 135 extending upward on the left side (inside in the left-right direction) of the right footrest 15 . are placed in By adopting such an arrangement, the extending portion 135 serves as a heat shield, so that the rider's feet placed on the right footrest 15 can be more effectively protected from the heat of the catalyst 81 .

Further, the catalyst 81 is provided at an intermediate position between the down frame 23 and the right footrest bracket 14 as viewed from the front of the vehicle. By adopting such an arrangement, it is possible to prevent the catalyst 81 from approaching the down frame 23 excessively, so that heat damage to the down frame 23 due to the heat of the catalyst 81 can be suppressed.

In addition, the upstream connecting pipe 83 has a bent shape and is provided downstream of the first pipe 105 forming an integral structure, and has a bent shape and forms a monaka structure. and the second pipe 106 , and the upper end of the catalyst 81 is located above the extension line E of the mating surface Y between the crankcase 41 and the cylinder 42 when viewed from the side of the vehicle. By adopting such an arrangement, the catalyst 81 can be arranged close to the exhaust port 60 of the engine 9, and the high-temperature exhaust gas immediately after being discharged from the exhaust port 60 of the engine 9 activates the catalyst 81 early. It is possible to improve the purification performance of the catalyst 81 for the exhaust gas.

Further, the catalyst 81 is arranged in front of the mating surface X between the crankcase 41 and the clutch cover 45 . By adopting such an arrangement, the catalyst 81 is placed on the left side (inward in the lateral direction) compared to the case where the catalyst 81 is arranged on the right side (outside in the lateral direction) of the mating surface X between the crankcase 41 and the clutch cover 45. ), the right footrest 15, which is arranged on the right side (outside in the left-right direction) of the catalyst 81, can also be arranged on the left side (inside in the left-right direction). Therefore, it becomes easier to secure an appropriate riding position.

A heat guard 20 is arranged between the catalyst 81 and the brake switch 19 . By adopting such an arrangement, the heat guard 20 can protect the brake switch 19 from the heat of the catalyst 81 , so the brake switch 19 can be arranged near the catalyst 81 together with the brake pedal 17 . Therefore, the brake switch 19 can be arranged close to the brake pedal 17, and the responsiveness of the brake switch 19 can be improved.

In addition, the catalyst cover 86 is arranged above the lower end of the right footrest 15 to connect the catalyst 81, the first pipe 105 and the second pipe 106 of the upstream connection pipe 83, and the first pipe body 116 of the downstream connection pipe 85. covering the By adopting such a configuration, it is possible to prevent the exhaust pipe 87 from becoming thicker than necessary, and it is possible to prevent an increase in the size of the vehicle.

Further, the second tubular body 117 of the downstream connecting pipe 85 (the portion of the downstream connecting pipe 85 not covered by the catalyst cover 86) is connected between the crankcase 41 and the clutch cover 45 of the engine 9 and the engine suspension bracket 28. It passes between the lower part and the brake pedal 17 . By adopting such a configuration, it is possible to effectively use the limited space around the engine 9 to dispose the second tubular body 117, thereby further effectively suppressing an increase in the size of the vehicle. can.

The front portion of the footrest guard 16 is arranged between the space S directly above the right footrest 15 and the catalyst 81 . By adopting such an arrangement, the rider's feet placed on the right footrest 15 can be protected from the heat of the catalyst 81 by the footrest guard 16 . Therefore, it is possible to more effectively suppress the deterioration of the riding comfort of the rider due to the heat of the catalyst 81 .

(Modification)
In this embodiment, each footrest 15 is arranged so that the position in the front-rear direction partially overlaps with the catalyst 81 . On the other hand, in other different embodiments, each footrest 15 may be arranged so that its longitudinal position entirely overlaps with the catalyst 81 .

In this embodiment, the entirety of each footrest 15 is arranged forward of the engine 9 . On the other hand, in other different embodiments, a portion of each footrest 15 may be arranged forward of the engine 9 .

In this embodiment, the brake pedal 17 is arranged so that the position in the front-rear direction partially overlaps with the catalyst 81 . On the other hand, in other different embodiments, the brake pedal 17 may be arranged so that its longitudinal position entirely overlaps with the catalyst 81 .

In this embodiment, the entire brake pedal 17 is arranged forward of the engine 9 . On the other hand, in other different embodiments, part of the brake pedal 17 may be arranged in front of the engine 9 .

In this embodiment, the extending portion 135 is arranged so as to partially overlap with the catalyst 81 when viewed from the side of the vehicle. On the other hand, in other different embodiments, the extending portion 135 may be arranged so as to entirely overlap with the catalyst 81 when viewed from the side of the vehicle.

In this embodiment, the brake switch 19 is arranged so as to partially overlap the catalyst 81 when viewed from the side of the vehicle. On the other hand, in other different embodiments, the brake switch 19 may be arranged so as to entirely overlap the catalyst 81 when viewed from the side of the vehicle.

In this embodiment, the catalyst 81 is arranged in front of the mating surface X between the crankcase 41 and the clutch cover 45 . On the other hand, in other different embodiments, the catalyst 81 may be arranged in front of the mating surfaces of the crankcase 41 and a cover other than the clutch cover 45 (for example, the magneto cover 46).

In this embodiment, the entire catalyst cover 86 is arranged above the lower end of the right footrest 15 . On the other hand, in other different embodiments, a portion of the catalyst cover 86 may be arranged below the lower end of the right footrest 15 .

In this embodiment, an air-cooled single-cylinder engine is used as an example of the engine 9 . On the other hand, in other different embodiments, the engine 9 may be an engine with a cooling system other than air cooling, such as a water-cooled engine or an oil-cooled engine. Also, in other different embodiments, a multi-cylinder engine may be used as an example of the engine 9 .

In this embodiment, a cruiser type motorcycle 1 is used as an example of a motorcycle. On the other hand, in other different embodiments, a type of motorcycle other than the cruiser type may be used as an example of the motorcycle.

1 Motorcycle 2 Body Frame 9 Engine 14 Footrest Bracket 15 Footrest 16 Footrest Guard 17 Brake Pedal 19 Brake Switch 20 Heat Guard 21 Head Pipe 22 Main Frame 23 Down Frame 28 Engine Suspension Bracket 41 Crankcase 42 Cylinder 43 Cylinder Head 45 Clutch Cover ( An example of a cover)
51 Crankshaft 60 Exhaust port 81 Catalyst 83 Upstream connecting pipe 84 Silencer 85 Downstream connecting pipe 86 Catalyst cover 87 Exhaust pipe 105 First pipe 106 Second pipe 134 Pedal mounting portion 135 Extension portion C Center axis of catalyst S Footrest X The mating surface of the crankcase and clutch cover Y The mating surface of the crankcase and cylinder E Extension of the mating surface of the crankcase and cylinder

Claims (4)

engine and
a silencer into which exhaust gas from the engine flows;
an exhaust pipe connecting the exhaust port of the engine and the muffler;
a catalyst provided in the exhaust pipe and arranged in front of the engine;
a footrest and a brake pedal at least partially arranged in front of the engine;
a footrest bracket to which the footrest is attached;
a pedal attachment portion protruding inward in the left-right direction from the footrest bracket and to which the brake pedal is attached ;
the footrest and the brake pedal are arranged so that their longitudinal positions at least partially overlap with the catalyst;
The exhaust pipe is
an upstream connecting pipe connecting the exhaust port of the engine and the upper end of the catalyst;
a downstream connection pipe that connects the lower end of the catalyst and the muffler;
a catalyst cover disposed inside the space directly above the footrest in the left-right direction and covering the catalyst, the upstream connection pipe, and the downstream connection pipe ;
The pedal mounting portion is located below the lower end portion of the catalyst and faces the downstream connecting pipe,
A motorcycle according to claim 1, wherein the downstream connecting pipe is offset inward in the left-right direction with respect to the central axis of the catalyst . engine and
a silencer into which exhaust gas from the engine flows;
an exhaust pipe connecting the exhaust port of the engine and the muffler;
a catalyst provided in the exhaust pipe and arranged in front of the engine;
a footrest and a brake pedal, at least a portion of which is located in front of the engine;
the footrest and the brake pedal are arranged so that their longitudinal positions at least partially overlap with the catalyst;
The engine is
a crankshaft ;
a crankcase that houses the crankshaft;
a cylinder connected to the crankcase;
a cylinder head connected to the cylinder;
a cover that covers the laterally outer side of the crankcase,
The exhaust pipe is
an upstream connecting pipe connecting the exhaust port of the engine and the upper end of the catalyst;
a downstream connection pipe that connects the lower end of the catalyst and the muffler;
a catalyst cover disposed inside the space directly above the footrest in the left-right direction and covering the catalyst, the upstream connection pipe, and the downstream connection pipe ;
The upstream connection pipe is
a first pipe having a bent shape and forming a unitary structure;
A second pipe that is provided on the downstream side of the first pipe in the exhaust direction, has a bent shape, and has a monaka structure that is formed in a hollow shape by joining a front portion and a rear portion that are separately molded. and
When viewed from the side of the vehicle, an upper end portion of the catalyst is positioned above an extension line of mating surfaces of the crankcase and the cylinder,
A motorcycle , wherein the catalyst is arranged in front of mating surfaces of the crankcase and the cover . engine and
a silencer into which exhaust gas from the engine flows;
an exhaust pipe connecting the exhaust port of the engine and the muffler;
a catalyst provided in the exhaust pipe and arranged in front of the engine;
a footrest and a brake pedal at least partially arranged in front of the engine;
a brake switch connected to the brake pedal and arranged to at least partially overlap the catalyst when viewed from the side of the vehicle;
a heat guard disposed between the catalyst and the brake switch ;
the footrest and the brake pedal are arranged so that their longitudinal positions at least partially overlap with the catalyst;
The exhaust pipe is
an upstream connecting pipe connecting the exhaust port of the engine and the upper end of the catalyst;
a downstream connection pipe that connects the lower end of the catalyst and the muffler;
A motorcycle, comprising: a catalyst cover disposed inside in the left-right direction of a space immediately above the footrest and covering the catalyst, the upstream connection pipe, and the downstream connection pipe. engine and
a silencer into which exhaust gas from the engine flows;
an exhaust pipe connecting the exhaust port of the engine and the muffler;
a catalyst provided in the exhaust pipe and arranged in front of the engine;
a footrest and a brake pedal at least partially arranged in front of the engine;
a vehicle body frame that supports the engine;
an engine suspension bracket that fixes the engine to the vehicle body frame ;
the footrest and the brake pedal are arranged so that their longitudinal positions at least partially overlap with the catalyst;
The exhaust pipe is
an upstream connecting pipe connecting the exhaust port of the engine and the upper end of the catalyst;
a downstream connection pipe that connects the lower end of the catalyst and the muffler;
a catalyst cover disposed inside the space directly above the footrest in the left-right direction and covering the catalyst, the upstream connection pipe, and the downstream connection pipe ;
The catalyst cover covers the catalyst, the upstream connecting pipe, and the downstream connecting pipe above the lower end of the footrest,
A motorcycle , wherein the downstream connecting pipe passes through between the engine, the engine suspension bracket, and the brake pedal .

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