CN211343074U - Motorcycle with a motorcycle body - Google Patents

Abstract

The utility model provides a motorcycle for restraining the peripheral component of a catalytic device from being damaged by heat due to heat from the catalytic device and improving the protective performance of the catalytic device. The motorcycle is provided with: a vehicle body frame (2); an engine (9) supported by the vehicle body frame; an exhaust pipe (86) through which exhaust gas discharged from an exhaust port of the engine flows; a catalyst device (81) disposed in the exhaust pipe and disposed in front of the engine; a body cover that covers at least a part of the body frame and covers at least a part of the catalytic device when viewed from the side of the vehicle; and a louver (15) that connects both side portions (14R, 14L) of the vehicle body cover in the left-right direction in front of the catalytic device, wherein the louver includes a plurality of lateral ribs (152) extending in the left-right direction, the plurality of lateral ribs are provided at intervals in the up-down direction, and at least a part of one or more lateral ribs overlaps the catalytic device when viewed from the front of the vehicle.

Description

Motorcycle with a motorcycle body

Technical Field

The utility model relates to a possess the catalytic unit's that is used for purifying waste gas motorcycle.

Background

Conventionally, a motorcycle includes an exhaust pipe through which exhaust gas discharged from an exhaust port of an engine flows, and a catalytic device for purifying the exhaust gas is provided in the exhaust pipe. In recent years, in order to cope with the restriction of exhaust gas, it is required to improve the purification performance of a catalytic device for exhaust gas. In order to meet such a demand, it is important to dispose the catalytic device as upstream as possible of the exhaust pipe, and therefore, the catalytic device may be disposed in front of the engine.

For example, patent document 1 discloses: at least a part of the catalytic device is located forward of the crankcase when viewed from the side of the vehicle.

Prior art documents

Patent document

Patent document 1: japanese patent laid-open publication No. 2017-114394

The temperature of the catalytic device becomes very high when the engine is driven. Therefore, when the catalyst device is disposed in front of the engine as described above, attention must be paid to thermal influence on components disposed in front of the engine together with the catalyst device. In particular, in a model having a large-sized body cover such as a full-cowling model, since heat of the catalyst device is easily accumulated in the internal space of the body cover, peripheral components of the catalyst device may be thermally damaged by heat from the catalyst device.

Further, if the catalyst device is disposed in front of the engine as described above, the catalyst device may be damaged by stone splash, or the temperature of the catalyst device may be lowered by splashing water (japanese patent application laid-open water), and thus the purification performance of the catalyst device with respect to exhaust gas may be lowered.

SUMMERY OF THE UTILITY MODEL

Therefore, an object of the present invention is to improve the protection performance of a catalyst device in a motorcycle in which the catalyst device is disposed in front of an engine, while suppressing the peripheral components of the catalyst device from being thermally damaged by heat from the catalyst device.

The utility model relates to a motorcycle possess: a vehicle body frame; an engine supported by the body frame; an exhaust pipe through which exhaust gas discharged from an exhaust port of the engine flows; a catalytic device disposed in the exhaust pipe and disposed in front of the engine; a body cover that covers at least a part of the body frame, and covers at least a part of the catalytic device when viewed from the side of the vehicle; and a louver that connects both side portions in the left-right direction of the vehicle body cover in front of the catalytic device, the louver including a plurality of lateral ribs extending in the left-right direction, the plurality of lateral ribs being provided at intervals in the up-down direction, and at least a part of one or more of the lateral ribs overlapping the catalytic device when viewed from the front of the vehicle.

According to the present invention, in the motorcycle in which the catalyst device is disposed in front of the engine, it is possible to suppress the situation in which the peripheral components of the catalyst device are thermally damaged by heat from the catalyst device, and to improve the protection performance of the catalyst device.

Drawings

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

Fig. 2 is a front view showing a motorcycle according to an embodiment of the present invention.

Fig. 3 is a right side view showing an engine and a peripheral portion thereof according to an embodiment of the present invention.

Fig. 4 is a front view showing an engine and a peripheral portion thereof according to an embodiment of the present invention.

Fig. 5 is a top view showing an engine and a peripheral portion thereof according to an embodiment of the present invention.

Fig. 6 is a right side view showing a vehicle body cover and a peripheral portion thereof according to an embodiment of the present invention.

Fig. 7 is a front view showing a vehicle body cover and a peripheral portion thereof according to an embodiment of the present invention.

Fig. 8 is a sectional view VIII-VIII of fig. 7.

Fig. 9 is a bottom view showing a vehicle body cover and a peripheral portion thereof according to an embodiment of the present invention.

Description of the symbols

1 motorcycle

2 vehicle body frame

4 front wheel

9 engines

14 vehicle body cover

Right side part of 14R vehicle body cover

Left side part of 14L vehicle body cover

15 louver board

31 handle device

33 handle of handle

41 crankcase

42 air cylinder

43 Cylinder head

51 crankshaft

60 exhaust port

81 catalytic device

86 exhaust pipe

135 side fairing

138 lower fairing

152 cross rib

152a lower surface of the cross rib

153 longitudinal rib

Boundary of B side fairing and lower fairing

G gap

OP1 rear opening

OP2 upper opening part

Detailed Description

In one embodiment of the present invention, at least a portion of the one or more cross ribs overlaps the catalytic device when viewed from the front of the vehicle. With this arrangement, the catalyst device can be protected by the cross rib, and thus damage to the catalyst device due to stone splash or a decrease in the temperature of the catalyst device due to water splash can be suppressed. That is, the protective performance of the catalytic device is improved.

In one embodiment of the present invention, the plurality of cross ribs are provided at intervals in the vertical direction. With this configuration, the air permeability of the internal space of the vehicle body cover can be improved, and the heat of the catalyst device can be prevented from accumulating in the internal space of the vehicle body cover. Therefore, it is possible to suppress the peripheral components of the catalyst device from being thermally damaged by heat from the catalyst device.

Examples

(motorcycle 1)

Hereinafter, a road type motorcycle 1 according to an embodiment of the present invention will be described with reference to fig. 1 to 9. Hereinafter, terms indicating directions such as front-back, left-right, up-down, and the like are used with reference to directions as viewed from a rider of the motorcycle 1. Arrows Fr, Rr, L, R, U, and Lo shown in the drawings indicate the front, rear, left, right, upper, and lower of the motorcycle 1, respectively.

Referring to fig. 1 to 3, a motorcycle 1 is mainly composed of a vehicle body frame 2, a steering mechanism 3 and a front wheel 4 disposed in front of the vehicle body frame 2, a fuel tank 5 and a rider seat 6 disposed above the vehicle body frame 2, a pair of left and right swing arms 7 and a rear wheel 8 disposed behind and below the vehicle body frame 2, an engine 9 supported by the vehicle body frame 2, an intake device 11 and an exhaust device 12 connected to the engine 9, a starter motor 13 disposed in front of the engine 9, a vehicle body cover 14 covering the entire vehicle body frame 2 from both sides in the left-right direction, and a louver 15 attached to the front lower portion of the vehicle body cover 14. Hereinafter, the above-described respective components will be described in order.

(vehicle body frame 2)

Referring to fig. 1, the vehicle body frame 2 is mainly composed of a head pipe 21, a main frame 22 extending rearward from the head pipe 21, a lower frame 23 extending downward from the head pipe 21, a pair of left and right side frames 24 branching from the rear end portion of the main frame 22 to the left and right and extending downward, and a pair of left and right seat rails 25 extending rearward from the rear portion of the main frame 22. The pair of left and right seat rails 25 are not shown except for fig. 1.

Referring to fig. 3, the main frame 22 is disposed from above the engine 9 to the rear. An attachment plate 26 is fixed to a central portion of the main frame 22 in the front-rear direction. Mounting brackets 27a are joined to the rear end portion of main frame 22 and the upper end portions of the pair of left and right side frames 24, and mounting brackets 27b are joined to the lower end portions of the pair of left and right side frames 24.

Referring to fig. 3 and 4, the lower frame 23 is disposed in front of the engine 9. The lower frame 23 extends linearly in the vertical direction when viewed from the vehicle side and the vehicle front. The lower frame 23 is disposed so as to overlap a center line M in the lateral direction of the vehicle over the entire region from the upper end portion to the lower end portion when viewed from the front of the vehicle. A pair of left and right fixing brackets 23a are joined to a substantially central portion of the lower frame 23 in the vertical direction.

An engine mount bracket 28 is disposed on the lower end side of the lower frame 23. The engine suspension bracket 28 includes a first side plate 28a, a second side plate 28b, and a front plate 28c that connects front ends of the first side plate 28a and the second side plate 28 b. The upper portion of the first side plate 28a is disposed on the right side (one side in the left-right direction) of the lower end portion of the lower frame 23, and the upper portion of the second side plate 28b is disposed on the left side (the other side in the left-right direction) of the lower end portion of the lower frame 23. The upper portions of the first side plate 28a and the second side plate 28B are mounted to the lower end portion of the lower frame 23 via a pair of upper and lower bolts B1. The upper portion of the front plate 28c is disposed forward of the lower end portion of the lower frame 23.

(steering mechanism 3 and front wheel 4)

Referring to fig. 1 and 2, the steering mechanism 3 is rotatably supported by the head pipe 21. The steering mechanism 3 includes a handlebar device 31 and a pair of left and right front forks 32. The handle device 31 is disposed above the head pipe 21 and extends in the left-right direction. Handle grips 33 are provided at both ends in the left-right direction of the handle device 31. The front wheel 4 is rotatably supported at the lower end portions of the pair of left and right front forks 32. The front wheel 4 is covered above by a front fender 34.

(Fuel tank 5 and rider's seat 6)

Referring to fig. 1, the fuel tank 5 is supported by a main frame 22. The rider seat 6 is disposed rearward of the fuel tank 5 and is supported by a pair of left and right seat rails 25.

(a pair of right and left swing arms 7 and rear wheels 8)

Referring to fig. 1, the front end portions 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. Thereby, the pair of right and left swing arms 7 can swing about the pivot shaft 35. The rear wheels 8 are rotatably supported at the rear end portions of the pair of right and left swing arms 7.

(Engine 9)

Referring to fig. 3 to 5, the 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 clutch cover 45 covering the right side (one side in the left-right direction) of the crankcase 41, and a magnet cover 46 covering the left side (the other side in the left-right direction) of the crankcase 41.

Referring to fig. 3, the rear wall portion of the cylinder head 43 is mounted to the mounting plate 26. Thereby, the rear wall portion of the cylinder head 43 is fixed to the front-rear direction center portion of the main frame 22 via the mounting plate 26.

The rear end of the crankcase 41 is attached to the mounting brackets 27a, 27 b. Thus, the rear end portion of the crankcase 41 is fixed to the rear end portion of the main frame 22 and the upper end portions of the pair of left and right side frames 24 via the mounting brackets 27a, and the rear end portion of the crankcase 41 is fixed to the lower end portions of the pair of left and right side frames 24 via the mounting brackets 27 b.

Both lateral side portions of the front end portion of the crankcase 41 are attached to lower portions of the first side plate 28a and the second side plate 28B of the engine suspension bracket 28 via a pair of upper and lower bolts B2. Thereby, the front end portion of the crankcase 41 is fixed to the lower end portion of the lower frame 23 via the engine mount bracket 28.

A crankshaft 51 is housed in a front portion of the crankcase 41. The crankshaft 51 is provided rotatably about a rotation axis R1 extending in the left-right direction. A counter drive gear 51a is provided on the crankshaft 51.

A balance shaft 52 is housed in a front end portion of the crankcase 41, below and in front of the crankshaft 51. The balance shaft 52 is disposed parallel to the crankshaft 51. The balance shaft 52 is provided rotatably about a rotation axis R2 extending in the left-right direction. The balance shaft 52 is provided with a balance driven gear 52 a. The balance driven gear 52a meshes with a balance drive gear 51a provided on the crankshaft 51.

Referring to fig. 5, a clutch mechanism 54 is provided on the right side (one side in the left-right direction) of the right side surface of the crankcase 41. The clutch mechanism 54 is covered with the clutch cover 45 from the right side (one side in the left-right direction). The clutch mechanism 54 is connected to the crankshaft 51 (see fig. 3) via a primary speed reduction mechanism (not shown).

Referring to fig. 5, a magnet 55 for power generation is provided on the left side (the other side in the left-right direction) of the left side surface of the crankcase 41. The magnet 55 is covered with the magnet cover 46 from the left side (the other side in the left-right direction). The magnet 55 is fixed to the left end of the crankshaft 51 (see fig. 3).

Referring to fig. 3, a piston (not shown) is housed in the cylinder 42. 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 communicating 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 a front wall portion of the cylinder head 43. An ignition plug 61 is attached to a right wall portion of the cylinder head 43.

(air intake device 11)

Referring to fig. 3, the intake device 11 includes an intake pipe 71 and an air cleaner (not shown) connected to the 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 device 12, when it is described as "upstream side" or "downstream side", it means "upstream side" or "downstream side" in the exhaust direction (the flow direction of the exhaust gas) in the exhaust device 12.

Referring to fig. 3 and 4, the exhaust device 12 includes a catalyst 81 disposed in front of the engine 9, a catalyst case 82 housing the catalyst 81, an upstream side connection pipe 83 connecting the exhaust port 60 of the engine 9 and an upper end portion (upstream side end portion) of the catalyst 81, a muffler 84 disposed behind the engine 9, and a downstream side connection pipe 85 connecting a lower end portion (downstream side end portion) of the catalyst 81 and the muffler 84. The catalyst device case 82, the upstream side connection pipe 83, and the downstream side connection pipe 85 constitute an exhaust pipe 86. In other words, the exhaust pipe 86 includes the catalyst housing 82, the upstream side connection pipe 83, and the downstream side connection pipe 85.

(catalyst 81 of exhaust device 12)

The catalyst device 81 of the exhaust device 12 is disposed in the exhaust pipe 86. The catalytic device 81 is constituted by a three-way catalytic device having a honeycomb structure, for example. The catalytic device 81 purifies exhaust gas by changing harmful components (e.g., carbon monoxide, carbon oxides, and nitrogen oxides) in the exhaust gas into harmless components (e.g., carbon dioxide, water, and nitrogen) through a chemical reaction.

Referring to fig. 2, the catalytic device 81 is disposed so as not to overlap the front wheels 4 when viewed from the front of the vehicle. The left side portion of the catalytic device 81 overlaps with the right front fork 32 as viewed from the front of the vehicle. The right side portion of the catalyst device 81 is disposed on the right side (one side in the left-right direction) of the right front fork 32 when viewed from the front of the vehicle.

Referring to fig. 3 and 4, the catalytic device 81 has a cylindrical shape. The catalytic device 81 is provided with the same diameter from the upper end (the upstream end) to the lower end (the downstream end). The catalytic device 81 extends linearly in the vertical direction when viewed from the side of the vehicle and when viewed from the front of the vehicle, and is disposed substantially parallel to the lower frame 23.

The lower end portion of the catalyst device 81 is located at substantially the same height as the rotation axis R1 of the crankshaft 51. The lower end of the catalyst device 81 is located above the rotation axis R2 of the balance shaft 52. A part of the catalytic device 81 overlaps with a lower end portion of the lower frame 23 and an upper portion of the engine mount bracket 28 when viewed from the vehicle side. The catalyst device 81 is disposed on the right side (one side in the left-right direction) of the lower frame 23 and the engine mount bracket 28 with a space therebetween when viewed from the front of the vehicle.

Referring to fig. 6, the catalytic device 81 is disposed below the right grip handle 33. The catalytic device 81 is disposed between the engine 9 and the louver 15 (described later in detail) when viewed from the side of the vehicle. Referring to fig. 7, the catalytic device 81 is disposed between the lower frame 23 and a right side portion 14R of the vehicle body cover 14 (described in detail later) when viewed from the front of the vehicle.

(catalyst housing 82 of exhaust device 12)

Referring to fig. 3, 4, the catalyst housing 82 of the exhaust device 12 is formed in a hollow shape by joining a front portion 82a and a rear portion 82b that are respectively molded. That is, the catalyst housing 82 forms a hollow configuration. The catalyst housing 82 is divided into a front portion 82a and a rear portion 82b by a plane passing through the center axis C of the catalyst 81.

The catalyst device case 82 includes a main body 93 and a reduced diameter portion 94 provided on the lower side (downstream side) of the main body 93. The main body 93 is provided with the same diameter from an upper end (upstream end) to a lower end (downstream end), and faces the outer peripheral surface of the catalytic device 81 with a gap therebetween. The reduced diameter portion 94 reduces in diameter from the upper side (upstream side) toward the lower side (downstream side). The reduced diameter portion 94 is disposed in front of the front end portion (the portion that houses the balancer shaft 52) of the crankcase 41.

(upstream side connection pipe 83 of exhaust device 12)

Referring to fig. 4 and 7, the upstream connecting pipe 83 of the exhaust device 12 extends from the upper end portion of the catalyst device 81 toward the center in the lateral direction of the vehicle so as to be gradually separated from the right side portion 14R of the vehicle body cover 14 (described later in detail) from below toward above when viewed from the front of the vehicle. The upstream connection 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.

Referring to fig. 3 and 4, the first pipe 105 has a shape curved from the exhaust port 60 of the engine 9 toward the right (one side in the left-right direction) so as to avoid the lower frame 23. The first pipe 105 is provided with the same diameter from a left end (an upstream end) to a right end (a downstream end). The first tube 105 is formed of an integrally formed unitary part. That is, the first tube 105 is of unitary construction.

A cylindrical upstream boss 108 projects upward from the outer peripheral surface of the first pipe 105. An upstream exhaust gas sensor 109 is attached to the upstream boss 108 so that the tip end portion faces upward. The upstream-side exhaust gas sensor 109 is disposed between the lower frame 23 and the cylinder head 43 when viewed from the vehicle side. The upstream side exhaust gas sensor 109 is disposed within the width of the cylinder head 43 in the left-right direction when viewed from the front of the vehicle.

An annular joint (not shown) is fixed to a left end portion (upstream end portion) of the outer peripheral surface of the first pipe 105. The joint is connected to an exhaust port 60 of the engine 9 via a gasket (not shown).

An annular flange 112 is attached to the outer peripheral surface of the first pipe 105 between the upstream boss 108 and the joint. The flange 112 is not fixed to the first pipe 105 and the joint. The flange 112 is fixed to the cylinder head 43 at the outer periphery of the exhaust port 60 of the engine 9.

The second pipe 106 has a shape curved toward the left side (the other side in the left-right direction) from the upper end portion of the catalyst device 81. The second pipe 106 is expanded in diameter from the upper left side (upstream side) toward the lower right side (downstream side).

The second tube 106 is formed in a hollow shape by joining the front portion 106a and the rear portion 106b which are respectively formed. That is, the second tube 106 forms a hollow configuration. The second pipe 106 is divided into two parts, a front part 106a and a rear part 106b, by a plane passing through the center axis C of the catalytic device 81. A recess 113 is provided in the rear portion 106b of the second tube 106.

The upper left end (upstream end) of the second pipe 106 is attached to the right end (downstream end) of the first pipe 105. The lower right end (downstream end) of the second pipe 106 is attached to the main body 93 of the catalyst case 82 with a space from the catalyst 81. An upper end portion of the catalytic device 81 is inserted into a right lower end portion of the second pipe 106.

(muffler 84 of exhaust apparatus 12)

Referring to fig. 3, muffler 84 of exhaust apparatus 12 includes a chamber 114 and a muffler 115 provided on the rear side (downstream side) of chamber 114. A sound-deadening chamber (not shown) is provided in each of the chamber 114 and the muffler 115.

(downstream side connection pipe 85 of exhaust device 12)

Referring to fig. 4 and 7, when viewed from the front of the vehicle, a downstream side connection pipe 85 of the exhaust device 12 extends from a lower end portion of the catalyst device 81 toward the center in the lateral direction of the vehicle so as to be gradually separated from a right side portion 14R of the vehicle body cover 14 (described later in detail) from above toward below. The tip end portion (upstream end portion) of the downstream side connection pipe 85 is housed in the lower portion of the catalyst device case 82. The lower end of the catalytic device 81 is inserted into the front end of the downstream connection pipe 85. The rear end portion (downstream end portion) of the downstream side connection pipe 85 is connected to the chamber 114 of the muffler 84.

Referring to fig. 4, a cylindrical downstream boss 118 protrudes leftward from the outer peripheral surface of the downstream connection pipe 85. A downstream exhaust gas sensor 119 is attached to the downstream boss 118 so that the tip end portion thereof faces the left side. The downstream exhaust gas sensor 119 is disposed below the crankcase 41 so as to overlap a center line M in the lateral direction of the vehicle. The downstream exhaust gas sensor 119 is located above the lower end edge 85a of the downstream connection pipe 85. The downstream exhaust gas sensor 119 is covered with a sensor protector 120 in front of and below it.

(Starter motor 13)

Referring to fig. 3 and 4, the starter motor 13 is disposed in front of the cylinder 42. The starter motor 13 is located above the mounting position (the position of the pair of upper and lower bolts B2) where the crankcase 41 is mounted to the engine suspension bracket 28. The starter motor 13 is disposed rearward of the lower frame 23 and the engine mount bracket 28.

A pair of attachment pieces 121 is provided on the right side surface of the starter motor 13 integrally with the starter motor 13. The pair of attachment pieces 121 are attached to the front end portion of the crankcase 41 via a pair of bolts B3. Thus, the starter motor 13 is fixed to the front end portion of the crankcase 41 via the pair of attachment pieces 121. The starter motor 13 includes a motor shaft 122 extending in the left-right direction. The motor shaft 122 is connected to the crankshaft 51 via an idle shaft (not shown).

The starter motor 13 is disposed between the catalyst device 81 and the cylinder 42 when viewed from the side of the vehicle, and is visible through a gap between the catalyst device 81 and the cylinder 42. The starter motor 13 is disposed on the right side (one side in the left-right direction) of the lower frame 23 as viewed from the front of the vehicle.

(body cover 14)

Referring to fig. 6 and 7, the vehicle body cover 14 is disposed on both sides in the right-left direction of the vehicle. The body cover 14 covers the entirety of the catalytic device 81 when viewed from the side of the vehicle. The vehicle body cover 14 does not cover the catalytic device 81 as viewed from the front of the vehicle.

The vehicle body cover 14 includes a vehicle body cowl 134, a pair of left and right side cowls 135 provided behind and below the vehicle body cowl 134, a pair of left and right first and second inner cowls 136 and 137 provided inside the pair of left and right side cowls 135 in the left-right direction, a lower cowl 138 provided below the pair of left and right side cowls 135, and a pair of left and right frame cowls 139 provided behind the pair of left and right side cowls 135.

The vehicle body cowling 134 of the vehicle body cover 14 covers the front of the handle device 31. The vehicle body cowl 134 is fastened to a license plate (not shown) together with a connection bracket 143 attached to the head pipe 21. Thereby, the vehicle body cowling 134 is fixed to the head pipe 21 via the connecting bracket 143.

Referring to fig. 5 and 6, a pair of left and right side cowls 135 of the vehicle body cover 14 covers both sides in the left-right direction of the cylinder head 43. The front upper portions of the pair of left and right side cowls 135 are connected to the rear lower portion of the vehicle body cowl 134.

An upper protrusion 145 protrudes rearward from the rear upper portion of the pair of left and right side cowls 135. The width of the upper protrusion 145 in the vertical direction gradually decreases from the front to the rear when viewed from the vehicle side. The upper protrusion 145 of the right side cowl 135 shields a space between the right grip handle 33 and the catalyst 81 together with the fuel tank 5.

Lower protrusions 146 protrude rearward below upper protrusions 145 at rear lower portions of the pair of left and right side cowls 135. The width of the lower protrusion 146 in the vertical direction gradually decreases from the front to the rear when viewed from the vehicle side.

Referring to fig. 7, the pair of left and right first inner cowls 136 of the vehicle body cover 14 is disposed along the inner surfaces of the pair of left and right side cowls 135. The pair of left and right first inner cowls 136 is provided with protrusions (not shown) into which rubber pads (not shown) are inserted. One end portions of a pair of left and right connection brackets 148 are attached to the projections. The other end portions of the pair of left and right connecting brackets 148 are attached to a pair of left and right fixing brackets 23a joined to the lower frame 23. Thus, the pair of left and right first inner cowls 136 is fixed to the lower frame 23 via the pair of left and right connecting brackets 148 and the pair of left and right fixing brackets 23 a.

The pair of left and right second inner cowls 137 of the vehicle body cover 14 is disposed along the inner surfaces of the pair of left and right side cowls 135 in front of the pair of left and right first inner cowls 136. The pair of left and right second inner cowls 137 is attached to the pair of left and right side cowls 135.

Referring to fig. 6 and 7, the lower cowl 138 of the vehicle body cover 14 is formed in a U shape that is open upward when viewed from the front of the vehicle. The lower cowling 138 covers both sides in the left-right direction of the front end portion of the crankcase 41. The lower cowl 138 connects lower end portions of the pair of left and right side cowls 135. The boundary B between the right side cowl 135 and the lower cowl 138 overlaps the catalytic device 81 when viewed from the side of the vehicle. The lower cowl 138 is attached to the attachment bracket 149 via a screw (not shown). Connecting brackets 149 are attached to the pair of left and right side frames 24 (see fig. 3). Thereby, the lower cowl 138 is fixed to the pair of left and right side frames 24 via the connecting bracket 149.

Referring to fig. 1 and 6, a pair of left and right frame fairings 139 of the vehicle body cover 14 extend in the front-rear direction. The pair of left and right frame fairings 139 cover both left and right sides of the central portion in the front-rear direction of the main frame 22. The front end portions of the pair of left and right frame cowls 139 are disposed between the upper protrusions 145 and the lower protrusions 146 of the pair of left and right side cowls 135.

The right side portion of the vehicle body cowl 134, the right side cowl 135, the right first and second inner cowls 136 and 137, and the right side portion of the lower cowl 138 and the right frame cowl 139 constitute a right side portion 14R of the vehicle body cowl 14. The left portion of the vehicle body cowl 134, the left side cowl 135, the left first and second inner cowls 136 and 137, and the left and left frame cowls 139 of the lower cowl 138 constitute a left portion 14L of the vehicle body cowl 14.

Referring to fig. 6, rear opening portions OP1 and upper opening portions OP2 are provided at rear portions of both left and right side portions 14R, 14L of the vehicle body cover 14. The rear-side opening portion OP1 is provided rearward of the catalyst device 81, and the upper-side opening portion OP2 is provided obliquely rearward and upward of the catalyst device 81 as viewed from the side of the vehicle. The upper opening portion OP2 is provided above the rear opening portion OP1 when viewed from the side of the vehicle. The opening area of the rear side opening portions OP1 is larger than the opening area of the upper side opening portions OP2 when viewed from the side of the vehicle.

The rear-side opening portions OP1 are provided between the lower side protrusions 146 of the pair of left and right side cowls 135 and the lower cowl 138. The upper opening OP2 is provided between the lower protrusions 146 of the pair of left and right side cowls 135 and the pair of left and right frame cowls 139. That is, rear-side opening OP1 and upper-side opening OP2 are separated by lower protrusions 146 of the pair of left and right side cowls 135. The rear opening OP1 and the upper opening OP2 are provided rearward of the handle device 31 and forward of the rider seat 6 (see fig. 1).

Referring to fig. 7, a front-side opening OP3 is provided at a front lower portion of the vehicle body cover 14. The front opening OP3 is provided in front of the catalytic device 81. The front opening OP3 is surrounded by the vehicle body cowl 134, the pair of left and right side cowls 135, and the lower cowl 138.

(louver 15)

Referring to fig. 6 and 7, the louvers 15 connect the left and right side portions 14R and 14L of the vehicle body cover 14 to each other in front of the catalyst device 81. The louver 15 is provided below the handle device 31 behind the front wheel 4 and the front fender 34.

Referring to fig. 7, the louver 15 includes a mounting frame 151, a plurality of lateral ribs 152 provided on the inner periphery of the mounting frame 151, a plurality of longitudinal ribs 153, a connecting piece 155, and a fixing piece 156. All the above components of the louver 15 are integrally molded.

The mounting frame 151 of the louver 15 is formed in an upwardly open U-shape. The attachment frame 151 is fitted into the front opening OP3 of the vehicle body cover 14. Upper portions of both left and right side portions of the mounting frame 151 are attached to the pair of left and right side cowls 135 by clips X1. Upper ends of both lateral side portions of the mounting frame 151 are attached to the pair of left and right second inner cowls 137 by clips X2. The lower end of the mounting frame 151 is mounted to the lower cowl 138 by a clip X3. With the above-described structure, the louver 15 is fixed to the vehicle body cover 14.

The plurality of cross ribs 152 of the blind slats 15 extend in the left-right direction. The plurality of cross ribs 152 are provided at intervals in the vertical direction. A gap G is formed between the vertically adjacent cross ribs 152 when viewed from the front of the vehicle.

In this embodiment, the louver 15 includes 10 cross ribs 152. The length of the 4 th to 9 th transverse ribs 152 in the left-right direction from above is longer than the length of the 2 st to 3 th and 10 th transverse ribs 152 in the left-right direction from above, and both side portions in the left-right direction of the mounting frame 151 are connected. The right side portion of the 6 th to 8 th cross rib 152 from above overlaps the catalyst device 81 when viewed from the front of the vehicle. When viewed from the front of the vehicle, the gaps G formed between the 6 th to 9 th cross ribs 152 from above overlap the catalytic device 81.

Referring to fig. 8 and 9, the lower surfaces 152a of the plurality of cross ribs 152 are inclined downward from the front toward the rear. The plurality of cross ribs 152 are provided at positions shifted in the front-rear direction. The front and rear adjacent cross ribs 152 overlap without a gap when viewed from below the vehicle. For example, when viewed from the vehicle lower side, the rear portion of the front cross rib 152 of the front-rear adjacent cross rib 152 overlaps the front portion of the rear cross rib 152.

Referring to fig. 7, the plurality of longitudinal ribs 153 of the louver 15 extend in the vertical direction. The plurality of longitudinal ribs 153 connect both lateral side portions of the vertically adjacent lateral ribs 152. The entire two vertical ribs 153 connecting the right side portions of the 6 th to 8 th lateral ribs 152 from above overlap the catalyst device 81 when viewed from the front of the vehicle.

The coupling piece 155 of the blind slat 15 extends in the up-down direction. The connecting piece 155 connects the center portions in the left-right direction of the 1 st to 8 th transverse ribs 152 from above. The connecting piece 155 overlaps with the lower portion of the lower frame 23 as viewed from the front of the vehicle.

The fixing piece 156 of the louver 15 protrudes rightward (leftward and rightward) from the upper portion of the connecting piece 155. The fixing piece 156 connects right side portions of the 2 nd to 3 rd cross ribs 152 from above. The fixing piece 156 is attached to the right attachment bracket 148 via a bolt B4.

(starting of Engine 9)

Referring to fig. 3, when the engine 9 is started, the starter motor 13 is driven. Thus, when the starter motor 13 is driven, the motor shaft 122 of the starter motor 13 is rotated. When the motor shaft 122 rotates in this way, the rotation of the motor shaft 122 is transmitted to the crankshaft 51 via an idle shaft (not shown), and the crankshaft 51 rotates. Thus, the starter motor 13 starts the engine 9.

(suppression of vibration of engine 9)

Referring to fig. 3, when the engine 9 is driven, the crankshaft 51 rotates. When the crankshaft 51 rotates in this way, the rotation of the crankshaft 51 is transmitted to the balance shaft 52 via the balance drive gear 51a and the balance driven gear 52a, and the balance shaft 52 rotates. Thereby suppressing vibration of the engine 9 accompanying rotation of the crankshaft 51.

(exhaust gas of engine 9)

Referring to fig. 3, when the engine 9 is driven, exhaust gas is discharged from an exhaust port 60 of the engine 9. The exhaust gas discharged from the exhaust port 60 of the engine 9 flows into the catalyst device 81 through the first pipe 105 and the second pipe 106 of the upstream side connection pipe 83 in this order, and is purified by the catalyst device 81. The exhaust gas purified by the catalytic device 81 flows into the chamber 114 of the muffler 84 through the downstream side connection pipe 85. The exhaust gas flowing into the chamber 114 of the muffler 84 passes through the chamber 114 of the muffler 84 and the muffler 115 in this order and is discharged to the rear of the vehicle.

(flow of running wind)

During vehicle traveling, traveling wind flows into the internal space of the vehicle body cover 14 through the front side opening portion OP3 of the vehicle body cover 14. At this time, the traveling wind passes through the gap G formed between the vertically adjacent cross ribs 152. The traveling wind flowing into the internal space of the vehicle body cover 14 passes through the peripheral portion of the catalytic device 81 and the peripheral portion of the engine 9, and is discharged from the internal space of the vehicle body cover 14 through the rear-side opening OP1 of the vehicle body cover 14.

(Effect)

In the present embodiment, a part of the plurality of cross ribs 152 overlaps the catalytic device 81 as viewed from the front of the vehicle. With this arrangement, the catalyst device 81 can be protected by the plurality of cross ribs 152, and thus damage to the catalyst device 81 due to stone splash or a decrease in the temperature of the catalyst device 81 due to splash into water can be suppressed. That is, the protective performance of the catalytic device 81 is improved.

In the present embodiment, the plurality of cross ribs 152 are provided at intervals in the vertical direction. With such a configuration, the air permeability of the internal space of the vehicle body cover 14 can be improved, and the heat of the catalyst device 81 can be suppressed from being accumulated in the internal space of the vehicle body cover 14. Therefore, it is possible to suppress the peripheral components of the catalytic device 81 from being thermally damaged by heat from the catalytic device 81.

In the present embodiment, the front opening OP3 is provided particularly in the vehicle body cover 14, and the vehicle body cover 14 is largely opened in front of the catalyst device 81. Therefore, heat of the catalyst device 81 can be suppressed from being accumulated in the internal space of the vehicle cover 14 not only when the vehicle is running but also when the vehicle is stopped. Therefore, it is possible to more effectively suppress the peripheral components of the catalytic device 81 from being thermally damaged by heat from the catalytic device 81.

Further, the louver 15 includes a plurality of vertical ribs 153 extending in the vertical direction. With such a configuration, the rigidity of the louver 15 is improved as compared with the case where the louver 15 includes only the plurality of cross ribs 152.

Further, the plurality of longitudinal ribs 153 overlap the catalyst device 81 when viewed from the front of the vehicle. By adopting such an arrangement, not only the catalyst device 81 but also the catalyst device 81 can be protected by the plurality of lateral ribs 152, and the protection performance of the catalyst device 81 can be further improved. Further, since the traveling wind directly contacting the catalyst device case 82 housing the catalyst device 81 can be reduced, the catalyst device 81 can be prevented from being excessively cooled.

Further, the plurality of cross ribs 152 are provided with a shift in position in the front-rear direction, and the cross ribs 152 adjacent in the front-rear direction overlap without a gap when viewed from the vehicle lower surface. By adopting such a configuration, the catalytic device 81 can be protected from stones, water, and the like splashed by the front wheels 4. Therefore, the protective performance of the catalytic device 81 is further improved.

Further, when viewed from the front of the vehicle, a gap G is formed between the vertically adjacent lateral ribs 152, and the lower surfaces 152a of the lateral ribs 152 are inclined downward from the front toward the rear. With this configuration, the traveling wind can pass through the gap G, and stones, water, and the like splashed by the front wheel 4 can be caused to collide with the lower surfaces 152a of the plurality of cross ribs 152 and fall down. Therefore, the air permeability of the internal space of the vehicle body cover 14 and the protection performance of the catalyst device 81 are further improved.

The catalyst device 81 is disposed below the right grip handle 33, and the vehicle body cover 14 shields a space between the right grip handle 33 and the catalyst device 81. With this arrangement, the air heated by the catalytic device 81 can be prevented from touching the hand of the rider gripping the handlebar 33, and riding comfort can be improved.

Further, the opening area of the rear side opening portions OP1 is larger than the opening area of the upper side opening portions OP2 when viewed from the side of the vehicle. With this configuration, the traveling wind flowing into the internal space of the vehicle body cover 14 can be actively discharged from the rear-side opening OP1 during traveling of the vehicle, and heat damage to the peripheral components of the catalyst device 81 due to heat from the catalyst device 81 can be more effectively suppressed. When the vehicle is stopped, the air heated by the catalyst device 81 can be discharged not only from the rear opening OP1 but also from the upper opening OP 2. Therefore, heat of the catalyst device 81 can be suppressed from being accumulated in the internal space of the vehicle cover 14 not only when the vehicle is running but also when the vehicle is stopped.

In addition, the catalytic device 81 is disposed so as not to overlap the front wheels 4 when viewed from the front of the vehicle. By adopting such a configuration, the possibility that stones, water, and the like splashed by the front wheels 4 are splashed toward the catalytic device 81 side is reduced, and therefore the protective performance of the catalytic device 81 is further improved. Further, since the traveling wind toward the catalyst device 81 can be suppressed from being obstructed by the front wheels 4, thermal damage to the peripheral components of the catalyst device 81 due to heat from the catalyst device 81 can be more effectively suppressed.

Further, when viewed from the vehicle side, the boundary B between the right side cowl 135 and the lower cowl 138 overlaps the catalyst device 81. By adopting such a configuration, the position of the catalytic device 81 can be increased, and therefore, damage of the catalytic device 81 due to stone splash or a decrease in the temperature of the catalytic device 81 due to splash into water can be more effectively suppressed.

(modification example)

In the present embodiment, the body cover 14 covers the entirety of the body frame 2. On the other hand, in other different embodiments, the body cover 14 may cover a part of the body frame 2.

In the present embodiment, the body cover 14 covers the entirety of the catalytic device 81 as viewed from the side of the vehicle. On the other hand, in other different embodiments, the body cover 14 may cover a part of the catalytic device 81 as viewed from the side of the vehicle.

In the present embodiment, a part of the plurality of cross ribs 152 overlaps the catalytic device 81 as viewed from the front of the vehicle. On the other hand, in other different embodiments, the entirety of the plurality of cross ribs 152 may overlap the catalytic device 81, or a part or the entirety of 1 cross rib 152 may overlap the catalytic device 81.

In the present embodiment, the entirety of the plurality of longitudinal ribs 153 overlaps the catalytic device 81 when viewed from the front of the vehicle. On the other hand, in other different embodiments, a part of the plurality of longitudinal ribs 153 may overlap the catalytic device 81, or a part or the whole of 1 longitudinal rib 153 may overlap the catalytic device 81.

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

In the present embodiment, a road type motorcycle 1 is taken as an example of a motorcycle. On the other hand, in another different embodiment, the off-road motorcycle 1 may be an example of a motorcycle.

According to the above embodiment, a first aspect of the present invention is a motorcycle comprising: a vehicle body frame; an engine supported by the body frame; an exhaust pipe that discharges exhaust gas discharged from an exhaust port of the engine; a catalytic device disposed in the exhaust pipe and disposed in front of the engine; a body cover that covers at least a part of the body frame, and covers at least a part of the catalytic device when viewed from the side of the vehicle; and a louver that connects both side portions in the left-right direction of the vehicle body cover in front of the catalytic device, the louver including a plurality of lateral ribs extending in the left-right direction, the plurality of lateral ribs being provided at intervals in the up-down direction, at least a part of one or more of the lateral ribs overlapping the catalytic device when viewed from the front of the vehicle.

According to the above-described embodiment, a second aspect of the present invention is that the louver includes the vertical rib extending in the vertical direction, and at least a part of the vertical rib overlaps the catalytic device when viewed from the front of the vehicle.

According to the above embodiment, a third aspect of the present invention is that the positions of the plurality of cross ribs provided in the front-rear direction are shifted from each other, and when viewed from below the vehicle, the cross ribs adjacent to each other in the front-rear direction overlap without a gap.

According to the above embodiment, a fourth aspect of the present invention is that, when viewed from the front of the vehicle, a gap is formed between the vertically adjacent lateral ribs, and the lower surfaces of the plurality of lateral ribs incline downward from the front toward the rear.

According to the above-described embodiment, a fifth aspect of the present invention is that the motorcycle includes a handle device disposed above the body frame, the handle grips are provided at both ends of the handle device in the left-right direction, the catalyst device is provided below the handle grips, and the body cover shields between the handle grips and the catalyst device.

According to the above-described embodiment, a sixth aspect of the present invention is that the body cover has a rear-side opening portion provided at the rear of the catalytic device when viewed from the vehicle side, and an upper-side opening portion provided obliquely rearward and upward of the catalytic device when viewed from the vehicle side, and an opening area of the rear-side opening portion is larger than an opening area of the upper-side opening portion when viewed from the vehicle side.

According to the above-described embodiment, a seventh aspect of the present invention is that the motorcycle includes a front wheel disposed in front of the body frame, and the catalyst device is disposed so as not to overlap with the front wheel when viewed from the front of the vehicle.

According to the above-described embodiment, an eighth aspect of the present invention is that the engine includes a crankshaft, a crankcase for accommodating the crankshaft, a cylinder connected to the crankcase, and a cylinder head connected to the cylinder, and the body cover includes a pair of left and right side cowlings for covering both sides of the cylinder head in the left-right direction, and a lower cowl for connecting lower ends of the pair of left and right side cowlings, and a boundary between one of the side cowlings and the lower cowl overlaps the catalyst device when viewed from the side of the vehicle.

Claims (8)

1. A motorcycle, characterized by comprising:

a vehicle body frame;

an engine supported by the body frame;

an exhaust pipe that discharges exhaust gas discharged from an exhaust port of the engine;

a catalytic device that is provided in the exhaust pipe and is disposed in front of the engine;

a body cover that covers at least a part of the body frame, and covers at least a part of the catalytic device when viewed from the side of the vehicle; and

louver plates that connect both side portions in the left-right direction of the vehicle body cover in front of the catalytic device,

the louver board is provided with a plurality of transverse ribs extending along the left-right direction, the transverse ribs are arranged at intervals in the vertical direction,

at least a portion of one or more of the cross ribs overlaps the catalytic device when viewed from the front of the vehicle.

2. A motorcycle according to claim 1,

the louver board is provided with longitudinal ribs extending along the vertical direction,

at least a part of the longitudinal rib overlaps the catalytic device when viewed from the front of the vehicle.

3. A motorcycle according to claim 1,

the plurality of transverse ribs are respectively arranged in a staggered way in the front-back direction,

the front and rear adjacent cross ribs overlap without a gap when viewed from below the vehicle.

4. A motorcycle according to claim 1,

a gap is formed between the upper and lower adjacent ones of the cross ribs when viewed from the front of the vehicle,

the lower surfaces of the plurality of cross ribs are inclined downward from the front toward the rear.

5. A motorcycle according to claim 1,

further comprises a handle device arranged above the vehicle body frame,

handle grips are provided at both ends in the left-right direction of the handle device,

the catalytic device is arranged below the handle grip,

the body cover shields between the handle grip and the catalytic device.

6. A motorcycle according to claim 1,

the vehicle body cover has a rear-side opening portion provided rearward of the catalytic device as viewed from a vehicle side, and an upper-side opening portion provided obliquely rearward and upward of the catalytic device as viewed from the vehicle side,

the opening area of the rear opening portion is larger than the opening area of the upper opening portion when viewed from the side of the vehicle.

7. A motorcycle according to claim 1,

further comprises a front wheel arranged in front of the vehicle body frame,

the catalytic device is configured not to overlap the front wheel when viewed from the front of the vehicle.

8. A motorcycle according to any one of claims 1 to 7,

the engine includes a crankshaft, a crankcase for accommodating the crankshaft, a cylinder connected to the crankcase, and a cylinder head connected to the cylinder,

the vehicle body cover includes a pair of left and right side cowlings covering both sides in the left-right direction of the cylinder head, and a lower cowl connecting lower ends of the pair of left and right side cowlings,

the boundary between the side cowl and the lower cowl of one side overlaps the catalytic device when viewed from the side of the vehicle.

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