CN216078210U - Cover structure for saddle-ride type vehicle - Google Patents

Abstract

The utility model provides a cover structure of a saddle-ride type vehicle for inhibiting dust from entering a clutch or a generator. A cover structure (120) for a motorcycle is provided with: a cover (72) that covers the clutch (17) from the outside in the axial direction of the axis (C2); a first rib (121) that is provided on the outer side of the clutch (17) in the radial direction perpendicular to the axis (C2) and that extends from the cover (72) toward the inside in the axial direction; and a second rib (122) which is provided at a position radially outward of the first rib (121) and extends from the cover (72) toward the inside in the axial direction longer than the first rib (121).

Description

Cover structure for saddle-ride type vehicle

Technical Field

The present invention relates to a cover structure of a saddle-ride type vehicle.

Background

Conventionally, a cover structure of a straddle-type vehicle is known which has a rib around a clutch (see, for example, international publication No. 2017/033615 and japanese laid-open patent publication No. 2009-30715).

For example, international publication No. 2017/033615 discloses a structure in which two ribs extending inward in the vehicle width direction from a transmission cover are provided in front of a clutch.

For example, japanese laid-open patent publication No. 2009-30715 discloses a structure in which a rib extending from a transmission case cover toward the inside in the vehicle width direction is provided around a clutch. The rib in japanese laid-open patent publication No. 2009-30715 overlaps the movable pulley half body when viewed from the radial direction when the movable pulley half body moves outward (leftward) in the axial direction.

SUMMERY OF THE UTILITY MODEL

Problems to be solved by the utility model

However, there is room for improvement in suppressing the intrusion of dust into the clutch or the generator during the operation of the engine.

An object of an aspect of the present invention is to suppress the intrusion of dust into a clutch or a generator.

The present invention has the following configuration.

(1) The cover structure of a saddle-ride type vehicle according to an aspect of the present invention includes: covers 72, 263 that cover either one of the clutch 17 and the generator 13 from the outside in the axial direction along the axes C1, C2 of either one of the clutch 17 and the generator 13; first ribs 121 and 221 provided on the outer side of either the clutch 17 or the generator 13 in a radial direction orthogonal to the axes C1 and C2 and extending from the covers 72 and 263 toward the inner side in the axial direction; and a second rib 122, 222 provided on the outer side in the radial direction than the first rib 121, 221 and extending from the cover 72, 263 toward the inner side in the axial direction longer than the first rib 121, 221.

(2) In the cover structure for a saddle-ride type vehicle according to the above (1), the cover 72 may cover the clutch 17 from the outside in the axial direction along the axis C2, an umbrella body 90 that is in an umbrella shape coaxial with the clutch 17 and is movable in the axial direction may be provided in the cover structure for a saddle-ride type vehicle, and the second rib 122 may overlap the umbrella body 90 when viewed from a radial direction orthogonal to the axis C2 when the umbrella body 90 moves outward in the axial direction and comes closest to the cover 72.

(3) In the cover structure for a saddle-ride type vehicle according to the above (2), the umbrella body 90 may have a folded portion 90a folded back from an outer peripheral end of the umbrella body 90 toward the cover 72, and the folded portion 90a, the first rib 121, and the second rib 122 may form a labyrinth structure 124.

(4) In the cover structure for a saddle-ride type vehicle according to the above (3), the folded portion 90a may shield a line K1 that connects the axial inner end of the first rib 121 and the axial inner end of the second rib 122, when viewed in a cross-section including the axis C2.

(5) In the cover structure for a saddle-ride type vehicle according to any one of the above (2) to (4), a band 82 having a plurality of convex cogs (cog)82a is wound around the umbrella body 90, the cogs 82a have engaging portions 82b that engage with the band 82 and convex portions 82c that extend in the radial direction of the umbrella body 90, and when the umbrella body 90 moves inward in the axial direction and is farthest from the cover 72, the gap 125 between the umbrella body 90 and the second rib 122 may be set smaller than the engaging portions 82b and the convex portions 82 c.

(6) In the cover structure for a saddle-ride type vehicle according to any one of (2) to (5) above, the second rib 122 may define a clutch chamber 123, the clutch chamber 123 being openable and closable by movement of the umbrella 90 in the axial direction, and when the rotation speed of the umbrella 90 is equal to or greater than a threshold value, the umbrella 90 may move outward in the axial direction and the clutch chamber 123 may be closed, and when the rotation speed of the umbrella 90 is less than the threshold value, the umbrella 90 may move inward in the axial direction and the clutch chamber 123 may be opened.

(7) In the cover structure for a saddle-ride type vehicle according to any one of the above (1) to (6), the cover structure for a saddle-ride type vehicle may further include a radial rib 126 that is radial when viewed from the axial direction and connects the first rib 121 and the second rib 122.

(8) In the cover structure for a saddle-ride type vehicle according to any one of the above (1) to (7), the cover 72 may have an exhaust port 136 capable of exhausting air inside the cover 72, and the second rib 122 may also serve as a part of a wall portion 137 forming the exhaust port 136.

According to the present invention, the cover structure for a saddle-ride type vehicle described in the above (1) includes: a cover that covers one of a clutch and a generator from an outside in an axial direction along an axis of the one of the clutch and the generator; a first rib provided on an outer side of either the clutch or the generator in a radial direction orthogonal to the axis and extending from the cover toward an inner side in the axial direction; and a second rib provided radially outward of the first rib and extending axially inward from the cover longer than the first rib.

Since one of the clutch and the generator is covered with the first rib from the radially outer side and the other of the clutch and the generator is covered with the second rib, which is longer than the first rib in the axial direction, from the radially outer side, dust can be more effectively blocked by the two-layer structure of the first rib and the second rib. Therefore, the intrusion of dust into the clutch or the generator can be suppressed.

According to the cover structure for the saddle-ride type vehicle described in the above (2) of the present invention, the clutch is covered by the cover from the outside in the axial direction along the axis line, the umbrella body that is in the shape of an umbrella coaxial with the clutch and is movable in the axial direction is provided in the cover structure for the saddle-ride type vehicle, and when the umbrella body is moved to the outside in the axial direction and is closest to the cover, the second rib overlaps the umbrella body when viewed from the radial direction orthogonal to the axis line, whereby the following effects are exhibited.

Since the umbrella body is covered with the second rib from the radially outer side, the intrusion of dust into the clutch can be more effectively suppressed.

According to the cover structure for a saddle-ride type vehicle described in the above (3) of the present invention, the umbrella body has the folded portion folded back from the outer peripheral end of the umbrella body toward the cover, and the folded portion, the first rib, and the second rib form the labyrinth structure, thereby achieving the following effects.

Since the labyrinth structure can more effectively shield the dust, the dust can be more effectively prevented from entering the clutch.

According to the cover structure for a saddle-ride type vehicle described in the above (4) of the present invention, the folded portion shields the line connecting the inner end in the axial direction of the first rib and the inner end in the axial direction of the second rib in a cross-sectional view including the axial line, thereby achieving the following effects.

The dust can be shielded more effectively by the folded portion, the inner end in the axial direction of the first rib, and the inner end in the axial direction of the second rib, and therefore, the intrusion of the dust into the clutch can be suppressed more effectively.

According to the cover structure for a saddle-ride type vehicle described in the above (5) of the present invention, the band having the plurality of convex-shaped cogs is wound around the umbrella body, the cogs have the engaging portions to be engaged with the band and the convex portions extending in the radial direction of the umbrella body, and when the umbrella body moves to the inside in the axial direction and is farthest from the cover, the gap between the umbrella body and the second rib is set smaller than the engaging portions and the convex portions, thereby achieving the following effects.

Even if the band reaches the outer diameter portion of the umbrella body, the band can be prevented from entering the gap between the umbrella body and the second rib.

According to the cover structure for a saddle-ride type vehicle described in the above (6) of the present invention, the clutch chamber is defined by the second rib, and the clutch chamber can be opened and closed by the axial movement of the umbrella body, and when the rotation speed of the umbrella body is equal to or greater than the threshold value, the umbrella body moves outward in the axial direction and the clutch chamber is closed, and when the rotation speed of the umbrella body is less than the threshold value, the umbrella body moves inward in the axial direction and the clutch chamber is opened, thereby achieving the following effects.

The clutch chamber is closed at a timing when dust is likely to enter from the outside, such as when the number of rotations of the umbrella body is equal to or greater than a threshold value (during high-speed operation), and therefore, the intrusion of dust into the clutch can be more effectively suppressed. On the other hand, at a timing when cooling is not easily performed, such as when the rotation speed of the umbrella body is less than the threshold value (during low-speed operation), the clutch chamber is opened, and therefore the clutch can be cooled more efficiently.

According to the cover structure for a saddle-ride type vehicle described in the above (7), the present invention further includes the radial ribs that are radial when viewed from the axial direction and connect the first ribs and the second ribs, thereby providing the following effects.

The first rib and the second rib can be reinforced by the radiation rib.

According to the cover structure for a saddle-ride type vehicle described in the above (8), the cover has the exhaust port capable of discharging air inside the cover, and the second rib also serves as a part of the wall portion forming the exhaust port, thereby achieving the following effects.

As compared with a case where a wall portion for forming the exhaust port is separately provided, the number of ribs can be reduced as much as possible, contributing to simplification of the structure.

Drawings

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

Fig. 2 is a left side view of the power unit of the embodiment.

Fig. 3 is a left side view of the power unit according to the embodiment with the outer case removed, together with an enlarged view of a portion a.

Fig. 4 is a diagram including section IV-IV of fig. 2.

Fig. 5 is a view showing the left side portion of fig. 4.

Fig. 6 is an enlarged view of a main portion of fig. 5 showing the first rib and the second rib of the embodiment.

Fig. 7 is a right side view of the outer housing of the embodiment.

Fig. 8 is a perspective view of the outer housing viewed from the rear right of the exhaust port in the embodiment.

Fig. 9 is a diagram corresponding to the right side portion of fig. 4 of the generator cover according to the modification of the embodiment.

Detailed Description

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

< vehicle entirety >

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

Steering system components including the handlebar 2 and the front wheel 3 are supported by a head pipe 21 at the front end of the frame 20 so as to be steerable. The front lower portion of the power unit 10 is vertically swingably supported by a support bracket 7 at the lower portion of the frame 20 via a suspension link 8. The rear end portion of the power unit 10 is supported at the rear portion of the frame 20 via a rear cushion 9 as a cushion device.

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

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

< Power Unit >

The power unit 10 is a swing type power unit in which an engine 11 and a power transmission structure 12 are integrated. As shown in fig. 4, the power unit 10 includes: an engine 11 as an internal combustion engine that combusts a combustible mixture to obtain an output; an ACG starter motor 13 (generator) functioning as a starter and a generator; a transmission 15 (power transmission mechanism) coupled to the crankshaft 14 and transmitting power from the engine 11 to the rear wheel 4 as a drive wheel; a centrifugal clutch 17 (clutch) for interrupting power transmission between the driven side of the transmission 15 and the driven shaft 16; and a speed reduction mechanism 18 that reduces the speed of the output from the transmission 15 and transmits the output to the rear wheels 4.

Power from the engine 11 is transmitted from the crankshaft 14 to the rear wheels 4 via the transmission 15, the centrifugal clutch 17, the driven shaft 16, and the reduction mechanism 18.

A battery, not shown, is connected to the ACG starter motor 13. When the ACG starter motor 13 functions as a starter, the battery supplies electric power to the ACG starter motor 13. When the ACG starter motor 13 functions as a generator, the battery is charged with regenerative electric power of the ACG starter motor 13. The engine 11 and the ACG starter motor 13 are controlled by a control unit, not shown.

< Engine >

The engine 11 is a single cylinder engine having a crankshaft 14 along the vehicle width direction. The engine 11 includes: a crankcase 40 rotatably supporting the crankshaft 14 and accommodating the crankshaft 14; a cylinder 41 projecting substantially horizontally (in detail, slightly higher in front and lower in rear) forward from a front end portion of the crankcase 40; and a piston 43 coupled to the crankshaft 14 via a connecting rod 42.

The cylinder 41 includes: a cylinder block 41a coupled to a front end of the crankcase 40; a cylinder head 41b coupled to a front end of the cylinder block 41 a; and a cylinder head cover 41c that covers the front end portion of the cylinder head 41 b. A combustion chamber 45 is formed in the cylinder 41.

The piston 43 is slidable within the cylinder 41. The reciprocating movement of the piston 43 is transmitted to the crankshaft 14 via the connecting rod 42. That is, the crankshaft 14 is rotated by the reciprocating movement of the piston 43. Hereinafter, the central axis C1 (rotation center line) of the crankshaft 14 is referred to as "crankshaft axis C1".

The cylinder head 41b is provided with an ignition plug 46 and a valve, not shown, for controlling intake and discharge of the air-fuel mixture into and from the combustion chamber 45. The opening and closing of the valves are controlled by rotation of a camshaft 47 pivotally supported by the cylinder head 41 b. A driven sprocket 48 is provided on one end side of the camshaft 47. A drive sprocket 49 is provided on one end side of the crankshaft 14. An endless camshaft drive chain 50 is mounted between the driven sprocket 48 and the drive sprocket 49. Thus, the camshaft 47 is rotated in conjunction with the rotation of the crankshaft 14.

A water pump 51 for cooling the engine 11 is provided at one end side of the camshaft 47. A rotary shaft 52 of the water pump 51 is attached to the cylinder 41 so as to rotate integrally with the camshaft 47. Thus, when the cam shaft 47 rotates, the water pump 51 can be driven.

As shown in fig. 2, an intake pipe 54 is connected to an upper wall of the cylinder head 41 b. The intake pipe 54 extends rearward and is connected to the throttle area 55. The throttle body 55 is connected to an air cleaner 57 via a connecting pipe 56. As shown in fig. 1, the air cleaner 57 is supported by an upper portion of the power unit 10. Thereby, the air cleaner 57 swings integrally with the power unit 10.

As shown in fig. 4, a rear wheel axle 4a (axle of the rear wheel 4) protruding rightward (toward the center of the vehicle body) is provided at the rear end portion of the power unit 10. The rotational power of the crankshaft 14 is transmitted to the rear wheel axle 4a via the power transmission structure 12 (e.g., the transmission 15, the centrifugal clutch 17, the driven shaft 16, and the reduction mechanism 18), thereby driving the rear wheel 4 supported by the rear wheel axle 4a and causing the vehicle to travel. In the figure, the symbol CR indicates a central axis (rear wheel axis) of the rear wheel axle 4a, which is an axis parallel to the crankshaft axis C1.

< ACG Starter Motor >

A stator housing 60 is connected to the right side of the crankcase 40 in the vehicle width direction. The ACG starter motor 13 is housed inside the stator housing 60. The ACG starter motor 13 is a motor in the form of an outer rotor. The ACG starter motor 13 includes a stator 61 and an outer rotor 62.

The stator 61 is fixed to the stator housing 60. The stator 61 includes teeth 61a and a coil 61b formed by winding a conductive wire around the teeth 61 a.

The outer rotor 62 is fixed to the crankshaft 14. The outer rotor 62 has a cylindrical shape covering the outer periphery of the stator 61. Magnets 62a are provided on the inner peripheral surface of the outer rotor 62.

A fan 62b for cooling the ACG starter motor 13 is attached to the outer rotor 62. A generator cover 63 covering the ACG starter motor 13 is provided at the right end of the stator housing 60 in the vehicle width direction. A cooling air intake port 63a is formed in the vehicle width direction outer side surface of the generator cover 63. Therefore, when the fan 62b rotates in synchronization with the crankshaft 14, the cooling air can be taken in from the cooling air intake port 63 a.

< Transmission case >

A transmission case 70 is connected to the left side of the crankcase 40 in the vehicle width direction. The transmission case 70 includes an inner case 71 that constitutes an inner portion of the transmission case 70 in the vehicle width direction, and an outer case 72 (cover) that constitutes an outer portion of the transmission case 70 in the vehicle width direction.

In the cross-sectional view of fig. 4, the inner case 71 has a box shape extending in the front-rear direction and opening the vehicle width direction outer side (left side). In the cross-sectional view of fig. 4, the outer case 72 has a box shape extending in the front-rear direction and opening the vehicle width direction inner side (right side).

A cover member 73 that covers the crankshaft 14 from the outside (left side) in the vehicle width direction is attached to the outer case 72. The cover member 73 extends forward and rearward along the outer case 72. As shown in fig. 2, an inlet 74 capable of introducing air outside the outer case 72 into the outer case 72 is provided at the front end of the cover member 73.

As shown in fig. 4, the side walls of the inner case 71 and the outer case 72 are provided with center fixing portions 75 and 76 which are disposed at front, rear, upper and lower center portions and protrude toward each other. The center fixing portions 75, 76 are disposed at positions overlapping in the vehicle width direction.

The inner case 71 and the outer case 72 have substantially the same outer shape in a side view of fig. 2.

A plurality of (for example, 9 in the present embodiment, see fig. 3) coupling bosses 77 protruding outward in the circumferential direction are provided on the circumferential wall of the inner case 71 and the circumferential wall of the outer case 72. In fig. 2, only the coupling boss 77 of the outer housing 72 is shown, and the coupling boss 77 of the inner housing 71 is not shown (see fig. 3). The connecting bosses 77 are disposed at positions overlapping in the vehicle width direction.

For example, after the inner case 71 and the outer case 72 are overlapped in the vehicle width direction, bolts are inserted through the respective coupling bosses 77 of the outer case 72 and screwed with the respective coupling bosses 77 (female screws, see fig. 3) of the inner case 71. Further, a bolt is inserted through a central fixing portion 76 (hereinafter also referred to as a "fastening boss 76") of the outer case 72 and screwed into a female screw of the central fixing portion 75 of the inner case 71 (see fig. 4). This enables the inner case 71 and the outer case 72 to be coupled.

As shown in fig. 4, the driven shaft 16 having an axis parallel to the crankshaft axis C1 is axially supported by the transmission housing 70. Hereinafter, the central axis C2 of the driven shaft 16, which is an axis parallel to the crankshaft axis C1, is referred to as "driven axis C2". Driven shaft 16 is disposed on the left side in the vehicle width direction. The driven shaft 16 is disposed between the crankshaft 14 and the rear wheel axle 4a so as to be offset from the rear wheel axle 4 a.

< speed variator >

The transmission 15 is housed inside the transmission case 70. The drive side portion of the transmission 15 is coupled to the crankshaft 14. The left end of the crankshaft 14 protrudes in the vehicle width direction from the crankcase 40. The transmission 15 includes a drive pulley 80 attached to the left end portion of the crankshaft 14, a driven pulley 81 attached to the driven shaft 16, and an endless V-belt 82 (belt) wound between the drive pulley 80 and the driven pulley 81. That is, the transmission 15 is a V-belt type continuously variable transmission.

As shown in fig. 5, the drive pulley 80 includes: a drive-side fixed pulley half 83 fixed to the crankshaft 14; and a drive-side movable pulley half 85 attached to the crankshaft 14 via a sleeve 84 so as to be slidable in a direction along the crankshaft axis C1.

The driving side fixed pulley half 83 rotates integrally with the crankshaft 14. A cooling fan 83a is attached to the rear surface (left surface) of the driving side fixed pulley half 83. The cooling fan 83a rotates in conjunction with the rotation of the crankshaft 14, and thus air can be sent radially outward of the cooling fan 83 a.

A shoe plate 86 is fixed to the crankshaft 14 on the back side (right side) of the driving-side movable pulley half-body 85. A counter roller 87 is accommodated between the driving-side movable pulley half-body 85 and the lamp plate 86. A belt groove 88 having a V-shape in a cross-sectional view of fig. 5 is formed between the driving side fixed pulley half 83 and the driving side movable pulley half 85.

The driven pulley 81 includes: a driven-side fixed pulley half-body 89 attached so as to be rotatable in the circumferential direction of the driven shaft 16 while sliding in the direction along the driven axis C2 is restricted; and a driven-side movable pulley half body 90 (an umbrella body) attached so as to be slidable in a direction along the driven axis C2. The driven-side fixed pulley half 89 is provided with a cylindrical boss portion 89a that covers the driven shaft 16 from the radially outer side. The driven-side movable sheave half 90 is attached to the boss portion 89a so as to be slidable in the axial direction along the driven axis C2.

A spring 91 that constantly biases the driven-side movable pulley half 90 toward the driven-side fixed pulley half 89 is provided on the rear surface side (left side) of the driven-side movable pulley half 90. A belt groove 92 having a V-shape in a cross-sectional view of fig. 5 is formed between the driven-side fixed pulley half 89 and the driven-side movable pulley half 90.

The V belt 82 is wound around belt grooves 88 and 92 formed between the driving side fixed pulley half 83 and the driving side movable pulley half 85 and between the driven side fixed pulley half 89 and the driven side movable pulley half 90.

In such a configuration, when the rotation speed of the crankshaft 14 (the engine rotation speed) increases, centrifugal force acts on the weight roller 87 in the drive pulley 80, and the drive-side movable pulley half-body 85 slides toward the drive-side fixed pulley half-body 83. Then, the driving side movable pulley half 85 approaches the driving side fixed pulley half 83 by the sliding amount, and the width of the belt groove 88 in the driving pulley 80 decreases. Therefore, the contact position between the drive pulley 80 and the V-belt 82 is shifted outward in the radial direction of the drive pulley 80, and the winding diameter of the V-belt 82 increases. Accompanying this, in the driven pulley 81, the width of the belt groove 92 increases. That is, the winding diameter of the V-belt 82 continuously changes according to the rotation speed of the crankshaft 14, and the transmission ratio automatically and steplessly changes. The winding diameter of the V-belt 82 to the driven pulley varies in inverse proportion to the winding diameter of the V-belt 82 to the drive pulley, thereby executing a stepless speed change.

That is, the transmission 15 is configured such that, when the rotation speed of the crankshaft 14 is large, the winding diameter of the V-belt 82 is large in the drive pulley 80, and the winding diameter of the V-belt 82 is small in the driven pulley 81. Therefore, the power of crankshaft 14 can be transmitted to driven shaft 16 at a small transmission ratio.

In fig. 2, reference numeral 82L denotes a V-belt 82 when the speed ratio of the transmission 15 is maximum, and reference numeral 82S denotes a V-belt 82 when the speed ratio of the transmission 15 is minimum.

< centrifugal clutch >

As shown in fig. 5, the centrifugal clutch 17 is disposed on the vehicle width direction outer side (left side) of the driven pulley 81. The centrifugal clutch 17 includes: a cup-shaped clutch outer 100 fixed to the driven shaft 16; an inner plate 101 fixed to the boss portion 89a of the driven-side fixed pulley half 89; a clutch shoe 103 attached to an outer edge portion of the inner plate 101 via a weight 102 so as to face radially outward; and a clutch spring 104 for urging the clutch shoe 103 radially inward.

The outer shape of the clutch outer 100 is smaller than the outer shape of the driven-side movable pulley half 90 when viewed in the direction along the driven axis C2. That is, when the driven-side movable pulley half 90 slides in a direction along the driven axis C2 (specifically, outward in the vehicle width direction), a part of the clutch outer 100 enters the radially inner side of the driven-side movable pulley half 90.

In such a configuration, when the rotation speed of the crankshaft 14 is equal to or less than a predetermined value (for example, 3000rpm or less), the power transmission between the transmission 15 (i.e., the driven pulley 81) and the driven shaft 16 is interrupted.

On the other hand, when the rotation speed of the crankshaft 14 exceeds the predetermined value, the centrifugal force acting on the weight 102 moves the weight 102 radially outward against the urging force applied radially inward by the clutch spring 104. Then, the friction member on the outer peripheral surface of the clutch shoe 103 abuts against the inner peripheral surface of the clutch outer 100. Thereby, the centrifugal clutch 17 is in a connected state. In this connected state, the rotation of the driven-side fixed pulley half 89 is transmitted to the clutch outer 100 via the inner plate 101, and the driven shaft 16 to which the clutch outer 100 is fixed is driven. That is, the rotation of the driven pulley 81 is transmitted to the driven shaft 16.

< reduction mechanism >

As shown in fig. 4, the reduction mechanism 18 is disposed in a transfer chamber 110 connected to the right side of the rear end portion of the transmission housing 70. The speed reduction mechanism 18 is disposed on the vehicle width direction inner side of the driven pulley 81. The speed reduction mechanism 18 includes: an intermediate shaft 111 axially supported in parallel with the driven shaft 16 and the rear wheel axle 4 a; a first reduction gear pair 112, 113 formed on the right end of the driven shaft 16 and the right side of the intermediate shaft 111, respectively; and a pair of second reduction gears 114 and 115 formed on the left side portion of the intermediate shaft 111 and the left end portion of the rear wheel axle 4a, respectively.

With such a configuration, the rotation of driven shaft 16 is decelerated at a predetermined reduction ratio and transmitted to rear wheel axle 4 a.

< cover structure >

As shown in fig. 6, the transmission case 70 includes a cover structure 120 that covers the centrifugal clutch 17 from the vehicle width direction outer side (left side). The cover structure 120 includes an outer case 72 covering the centrifugal clutch 17 from the outside in the axial direction along the driven axis C2, a first rib 121 provided at a position outside the centrifugal clutch 17 in the radial direction orthogonal to the driven axis C2, and a second rib 122 provided at a position outside the first rib 121 in the radial direction.

The first rib 121 extends toward the inside in the axial direction from the outer case 72. As shown in fig. 7, the first rib 121 has an annular shape coaxial with the driven axis C2 when viewed from the axial direction. As shown in fig. 6, the axial inner end of the first rib 121 is disposed axially outward of the axial inner end of the clutch outer 100. The axial inner end position of the first rib 121 (the height of the first rib 121) is located at substantially the same position over the entire circumference of the first rib 121. That is, the first rib 121 extends from the outer case 72 toward the inside in the axial direction to substantially the same position over the entire circumference of the first rib 121.

The second rib 122 extends from the outer case 72 toward the inside in the axial direction longer than the first rib 121. As shown in fig. 7, the second rib 122 has an annular shape coaxial with the driven axis C2 when viewed from the axial direction. Specifically, the second rib 122 includes a front arc portion 122a that is arc-shaped toward the front and a rear arc portion 122b that is arc-shaped toward the rear when viewed from the axial direction. The upper portion of the second rib 122 (front arc portion 122a) is connected to the upper portion of the peripheral wall of the outer case 72. The lower portion of the second rib 122 is connected to the lower portion of the peripheral wall of the outer case 72. The second ribs 122 have a larger diameter than the first ribs 121 when viewed from the axial direction.

As shown in fig. 6, the axial inner end of the second rib 122 is disposed axially inward of the axial inner end of the clutch outer 100. Inside the transmission housing 70, a clutch chamber 123 is partitioned by the second rib 122.

As described above, the driven pulley 81 includes the driven-side fixed pulley half 89 and the driven-side movable pulley half 90 (see fig. 6) around which the V-belt 82 is wound. As shown in fig. 6, the driven-side movable pulley half body 90 has an umbrella shape coaxial with the centrifugal clutch 17. The driven-side movable sheave half 90 is movable in the axial direction. The driven-side movable sheave half 90 has a folded portion 90a folded back from the outer peripheral end of the driven-side movable sheave half 90 toward the axial inner surface of the outer case 72.

The driven-side movable sheave half 90 shown by solid lines in fig. 6 indicates a case where the driven-side movable sheave half 90 moves axially inward and is farthest from the axially inner surface of the outer case 72 (hereinafter, also referred to as a "farthest state"). On the other hand, the driven-side movable sheave half 90 indicated by the chain double-dashed line indicates when the driven-side movable sheave half 90 moves outward in the axial direction and is closest to the inner surface in the axial direction of the outer case 72 (hereinafter, also referred to as "closest state").

In the closest state, the second rib 122 overlaps the driven-side movable pulley half-body 90 (two-dot chain line) when viewed from the radial direction. Specifically, the axially inner end portion of the second rib 122 overlaps the folded-back portion 90a (two-dot chain line) of the driven-side movable pulley half-body 90 in the closest state when viewed in the radial direction.

The first rib 121 is disposed radially between the clutch outer 100 and the folded portion 90 a. The second rib 122 is disposed radially outward of the folded portion 90 a. That is, the clutch outer 100, the first rib 121, the folded portion 90a, and the second rib 122 are arranged radially outward from the driven axis C2 side in this order. Thus, the folded portion 90a, the first rib 121, and the second rib 122 form a labyrinth structure 124. In the closest state, the folded-back portion 90a (two-dot chain line) blocks a line K1 connecting the axial inner end of the first rib 121 and the axial inner end of the second rib 122 when viewed in cross section in fig. 6 (including a cross-sectional view of the driven axis C2).

As shown in fig. 3, the V-belt 82 has a plurality of convex cogs 82 a. The cog 82a is provided on the inner peripheral surface (the surface facing the driven pulley 81 shown in fig. 6) of the V-belt 82. A plurality of cogs 82a are provided on the entire inner periphery of the V-belt 82.

As shown in fig. 6, in the most separated state, the second rib 122 (solid line) does not overlap with the driven-side movable sheave half 90 when viewed in the radial direction. Specifically, the folded-back portion 90a (solid line) of the driven-side movable pulley half-body 90 in the most separated state is disposed on the axially inner side of the axially inner end of the second rib 122 when viewed in the radial direction.

In the most separated state, the gap 125 between the driven-side movable pulley half 90 and the second rib 122 is set so that the cog 82a (see fig. 3) cannot pass therethrough. Here, the clearance 125 means a distance between the folded back portion 90a (solid line) of the driven-side movable pulley half 90 in the most separated state and the axial inner end of the second rib 122. For example, the gap 125 is set to be smaller than the minimum width of the outer shape of the cog 82a (see fig. 3).

Specifically, the cog 82a includes an engagement portion 82b that engages with the V-belt 82 and a projection 82c that extends radially inward of the driven-side movable pulley half 90 (see fig. 3). For example, the gap 125 is set smaller than the joint portion 82b and the projection 82 c.

The clutch chamber 123 can be opened and closed by axial movement of the driven-side movable sheave half 90.

Specifically, when the number of rotations of the driven-side movable sheave half body 90 is equal to or greater than the threshold value, the driven-side movable sheave half body 90 moves outward in the axial direction, and the clutch chamber 123 is closed. That is, when the driven-side movable pulley half 90 is in the closest state, the axially inner end portion of the second rib 122 overlaps the folded-back portion 90a (two-dot chain line) of the driven-side movable pulley half 90 when viewed from the radial direction, and the clutch chamber 123 is closed.

On the other hand, when the rotation speed of the driven-side movable sheave half 90 is less than the threshold value, the driven-side movable sheave half 90 moves inward in the axial direction, and the clutch chamber 123 is opened. That is, when the driven-side movable sheave half 90 is in the most separated state, the clutch chamber 123 is opened by the folded-back portion 90a (solid line) of the driven-side movable sheave half 90 being disposed axially inward of the axially inner end of the second rib 122 when viewed radially.

As shown in fig. 7, the cover structure 120 includes radial ribs 126 that are radial when viewed from the axial direction. The radial rib 126 connects the first rib 121 with the second rib 122. The radial ribs 126 are radial around the driven axis C2. The radiation rib 126 includes a plurality of (for example, 7 in the present embodiment) connection ribs 127 provided between the first rib 121 and the second rib 122. The plurality of connecting ribs 127 are arranged at intervals along the outer periphery of the first rib 121.

The connecting rib 127 extends in the radial direction across the outer circumferential surface of the first rib 121 and the inner circumferential surface of the second rib 122. The axially inner ends of the connecting ribs 127 have a circular shape when viewed from the axial direction. The axially inner end of the connecting rib 127 is provided as a flat surface substantially parallel to a plane orthogonal to the driven axis C2. By making the axial inner end of the connecting rib 127 a flat surface, it is possible to also serve as a pressing portion for releasing the mold.

From the viewpoint of uniformly applying force when the outer case 72 is pulled out from the mold, it is preferable that at least 3 pressing portions are provided. In the present embodiment, the axial inner ends of the 7 connection ribs 127 each serve as a pressing portion. Therefore, by pressing at least 3 of the 7 connection ribs 127, a force can be uniformly applied when the outer case 72 is pulled out from the mold.

The cover structure 120 is provided with a reinforcing rib 130 extending from the fastening junction boss 76 toward the second rib 122. The reinforcing rib 130 includes: a first inclined rib 131 extending rearward and upward from the fastening boss 76 and connected to the front upper portion of the second rib 122 (front arc portion 122 a); a second inclined rib 132 extending downward and rearward from the fastening boss 76; a first coupling rib 133 that couples a lower end portion of the second inclined rib 132 to a front lower portion of the second rib 122 (front arc portion 122 a); and a second coupling rib 134 that couples an upper and lower intermediate portion (a portion that is offset from the first coupling rib 133) of the second inclined rib 132 to a front lower portion of the second rib 122. This can reinforce the fastening boss 76 and the second rib 122, respectively.

As shown in fig. 8, the outer case 72 has an exhaust port 136 capable of discharging air inside the outer case 72. The exhaust port 136 is provided in a wall 137 at the rear of the transmission case 70 (see fig. 5). The wall portion 137 includes an outer side wall portion 138 forming an outer contour of the outer case 72 and an inner side wall portion 139 connected to the second rib 122 (rear side arcuate portion 122 b). That is, the second rib 122 also serves as a part of the wall 137 forming the exhaust port 136.

For example, air inside the outer case 72 is discharged in the direction of arrow W1 through the air outlet 136.

< action Effect >

As described above, the cover structure 120 of the motorcycle 1 according to the above embodiment includes: the outer case 72 covering the centrifugal clutch 17 from the outside in the axial direction of the driven axis C2; a first rib 121 provided on the outer side of the centrifugal clutch 17 in the radial direction perpendicular to the driven axis C2 and extending from the outer case 72 toward the inner side in the axial direction; and a second rib 122 provided radially outward of the first rib 121 and extending axially inward from the outer case 72 to a length longer than the first rib 121.

According to this configuration, since the centrifugal clutch 17 is covered from the radial outside by the first ribs 121 and the centrifugal clutch 17 is covered from the radial outside by the second ribs 122 that are longer than the first ribs 121 in the axial direction, dust can be more effectively blocked by the two-layer structure of the first ribs 121 and the second ribs 122. Therefore, the intrusion of dust into the centrifugal clutch 17 can be suppressed.

In the above embodiment, the outer case 72 covers the centrifugal clutch 17 from the outside in the axial direction, and the driven-side movable pulley half 90 that is in the form of an umbrella coaxial with the centrifugal clutch 17 and is movable in the axial direction is provided, and when the driven-side movable pulley half 90 moves outward in the axial direction and comes closest to the outer case 72, the second rib 122 overlaps the driven-side movable pulley half 90 as viewed in the radial direction, thereby achieving the following effects.

Since the driven-side movable pulley half 90 is covered with the second rib 122 from the radially outer side, the entry of dust into the centrifugal clutch 17 can be more effectively suppressed.

In the above embodiment, the driven-side movable sheave half 90 has the folded portion 90a folded back from the outer peripheral end of the driven-side movable sheave half 90 toward the outer case 72, and the folded portion 90a, the first rib 121, and the second rib 122 form the labyrinth structure 124, thereby achieving the following effects.

Since the dust can be shielded more effectively by the labyrinth structure 124, the dust can be more effectively prevented from entering the centrifugal clutch 17.

In the above embodiment, the folded-back portion 90a blocks the line K1 connecting the axial inner end of the first rib 121 and the axial inner end of the second rib 122 when viewed in a cross-section including the driven axis C2, thereby providing the following effects.

Since the dust can be shielded more effectively by the folded portion 90a, the axial inner end of the first rib 121, and the axial inner end of the second rib 122, the dust can be more effectively prevented from entering the centrifugal clutch 17.

In the above embodiment, the V-belt 82 having the plurality of convex-shaped cogs 82a is wound around the driven-side movable pulley half body 90, the cogs 82a have the engaging portions 82b that engage with the V-belt 82 and the convex portions 82c that extend in the radial direction of the driven-side movable pulley half body 90, and when the driven-side movable pulley half body 90 moves to the inside in the axial direction and is farthest from the outer case 72, the gap 125 between the driven-side movable pulley half body 90 and the second rib 122 is set smaller than the engaging portions 82b and the convex portions 82c, thereby achieving the following effects.

Even if the V-belt 82 reaches the outer diameter portion of the driven-side movable pulley half body 90, the V-belt 82 can be prevented from entering the gap 125 between the driven-side movable pulley half body 90 and the second rib 122.

In the above embodiment, the second rib 122 defines the clutch chamber 123, and the clutch chamber 123 is openable and closable by the axial movement of the driven-side movable pulley half body 90, and when the rotational speed of the driven-side movable pulley half body 90 is equal to or greater than the threshold value, the driven-side movable pulley half body 90 moves outward in the axial direction and the clutch chamber 123 is closed, and when the rotational speed of the driven-side movable pulley half body 90 is less than the threshold value, the driven-side movable pulley half body 90 moves inward in the axial direction and the clutch chamber 123 is opened, thereby achieving the following effects.

At a timing when dust is likely to enter from the outside, such as when the rotational speed of the driven-side movable sheave half 90 is equal to or greater than a threshold value (during high-speed operation), the clutch chamber 123 is closed, and therefore the entry of dust into the centrifugal clutch 17 can be more effectively suppressed. On the other hand, at a timing when cooling is not easily performed, such as when the rotation speed of the driven-side movable sheave half 90 is less than the threshold value (during low-speed operation), the clutch chamber 123 is opened, and therefore the centrifugal clutch 17 can be cooled more effectively.

In the above embodiment, the radiation ribs 126 that are radially formed when viewed from the axial direction and connect the first ribs 121 and the second ribs 122 are further provided, thereby achieving the following effects.

The first rib 121 and the second rib 122 can be reinforced by the radiation rib 126.

In the above embodiment, the outer case 72 has the exhaust port 136 capable of discharging air inside the outer case 72, and the second rib 122 also serves as a part of the wall 137 forming the exhaust port 136, thereby achieving the following effects.

As compared with a case where the wall 137 for forming the exhaust port 136 is separately provided, the number of ribs can be reduced as much as possible, which contributes to simplification of the structure.

< modification example >

In the above embodiment, the following example is given as an example: the cover structure 120 includes: the outer case 72 covering the centrifugal clutch 17 from the outside in the axial direction of the driven axis C2; a first rib 121 provided on the outer side of the centrifugal clutch 17 in the radial direction perpendicular to the driven axis C2 and extending from the outer case 72 toward the inner side in the axial direction; and a second rib 122 provided radially outward of the first rib 121 and extending axially inward from the outer case 72 to be longer than the first rib 121, but is not limited thereto. For example, the form of the cover structure 120 may be changed according to the required specifications.

For example, as shown in fig. 9, the cover structure 220 may include: a generator cover 263 that covers the ACG starter motor 13 from the outside in the axial direction along the crankshaft axis C1; a first rib 221 provided at a position outside the ACG starter motor 13 in a radial direction orthogonal to the crankshaft axis C1 and extending from the generator cover 263 toward the inside in the axial direction; and a second rib 222 provided radially outward of the first rib 221 and extending axially inward from the generator cover 263 to be longer than the first rib 221.

According to this structure, the ACG starter motor 13 is covered from the radial outside by the first rib 221, and the ACG starter motor 13 is covered from the radial outside by the second rib 222 that is longer than the first rib 221 in the axial direction, so that dust can be more effectively shielded by the two-layer structure of the first rib 221 and the second rib 222. Therefore, the dust can be prevented from entering the ACG starter motor 13.

In the above embodiment, the case where the cover covers the outer housing 72 of the centrifugal clutch 17 from the outside in the axial direction along the driven axis C2 has been described as an example, but the present invention is not limited to this. For example, as shown in fig. 9, the cover may be a generator cover 263 that covers the ACG starter motor 13 from the outside in the axial direction along the crankshaft axis C1. For example, the portions of the cover where the first ribs 121 and 221 and the second ribs 122 and 222 are provided may be changed according to the required specifications.

In the above embodiment, the driven-side movable sheave half 90 has the folded portion 90a folded back from the outer peripheral end of the driven-side movable sheave half 90 toward the outer case 72, and the labyrinth structure 124 is formed by the folded portion 90a, the first rib 121, and the second rib 122. For example, the driven-side movable sheave half 90 may not have the folded portion 90 a. For example, the labyrinth structure 124 may be formed by at least a part of the driven-side movable sheave half 90, the first rib 121, and the second rib 122. For example, the form of the driven-side movable sheave half 90 may be changed according to the required specifications.

In the above embodiment, the example in which the line K1 connecting the axial inner end of the first rib 121 and the axial inner end of the second rib 122 is blocked by the lower folded portion 90a in a cross-sectional view including the driven axis C2 has been described, but the present invention is not limited to this. For example, the folded-back portion 90a may not block the line K1 that connects the axial inner end of the first rib 121 and the axial inner end of the second rib 122 when viewed in cross section including the driven axis C2.

In the above embodiment, the following examples are given: the V-belt 82 having a plurality of convex-shaped cogs 82a is wound around the driven-side movable pulley half body 90, the cogs 82a have an engagement portion 82b that engages with the V-belt 82 and a convex portion 82c that extends in the radial direction of the driven-side movable pulley half body 90, and when the driven-side movable pulley half body 90 moves axially inward and is farthest from the outer case 72, the gap 125 between the driven-side movable pulley half body 90 and the second rib 122 is set smaller than the engagement portion 82b and the convex portion 82c, but the present invention is not limited thereto. For example, the gap 125 may be set larger than the joint 82b and the projection 82 c. For example, the V-belt 82 may have the cogs 82a only on one side, or may have the cogs 82a on both sides. For example, the V-belt 82 may not have the cog 82 a. For example, the form of the V-belt 82 may be changed according to the required specifications.

In the above embodiment, the following examples are given: the second rib 122 defines a clutch chamber 123, the clutch chamber 123 is openable and closable by axial movement of the driven-side movable pulley half body 90, the driven-side movable pulley half body 90 moves outward in the axial direction to close the clutch chamber 123 when the rotational speed of the driven-side movable pulley half body 90 is equal to or greater than a threshold value, and the driven-side movable pulley half body 90 moves inward in the axial direction to open the clutch chamber 123 when the rotational speed of the driven-side movable pulley half body 90 is less than the threshold value. For example, the clutch chamber 123 may be closed and opened regardless of the rotation speed of the driven-side movable sheave half 90. For example, the opening and closing timing of the clutch chamber 123 may be changed according to the required specification.

In the above embodiment, the example of providing the radial ribs 126 that are radial when viewed from the axial direction and connect the first ribs 121 and the second ribs 122 has been described, but the present invention is not limited to this. For example, the cover structure 120 may not include the radiation ribs 126. For example, the form for reinforcing the first rib 121 and the second rib 122 may be changed according to the required specifications.

In the above embodiment, the case 72 has the exhaust port 136 capable of discharging the air inside the case 72, and the second rib 122 doubles as a part of the wall 137 forming the exhaust port 136. For example, the second rib 122 may not also serve as a part of the wall 137 forming the exhaust port 136. For example, the wall 137 for forming the exhaust port 136 may be provided separately from the second rib 122. For example, the form of the wall 137 for forming the exhaust port 136 may be changed according to the required specification.

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

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

In the above embodiment, the example in which the transmission 15 includes the drive pulley 80, the driven pulley 81, and the V-belt 82 has been described, but the present invention is not limited to this. For example, the transmission 15 may include a member capable of performing other power transmission such as gear transmission and chain transmission. For example, the form of the transmission 15 may be changed according to the required specifications.

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

In the above embodiment, the power transmission structure 12 is described by way of example as including the transmission 15, the centrifugal clutch 17, the driven shaft 16, the reduction mechanism 18, and the like, but the present invention is not limited thereto. For example, the power transmission structure 12 may further include a one-way clutch that transmits power from the engine 11 to the rear wheel 4 side but does not transmit power from the rear wheel 4 to the engine 11 side. For example, the form of the power transmission structure 12 may be changed according to the required specifications.

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

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

Claims (8)

1. A cover structure of a saddle-ride type vehicle, wherein,

the cover structure of the saddle-ride type vehicle is provided with:

a cover (72, 263) that covers either one of a clutch (17) and a generator (13) from the outside in the axial direction along the axis (C1, C2) of either one of the clutch (17) and the generator (13);

a first rib (121, 221) that is provided on the outer side of either the clutch (17) or the generator (13) in a radial direction orthogonal to the axis (C1, C2), and that extends from the cover (72, 263) toward the inner side in the axial direction; and

and a second rib (122, 222) that is provided on the outer side in the radial direction than the first rib (121, 221), and that extends from the cover (72, 263) toward the inside in the axial direction longer than the first rib (121, 221).

2. The cover structure of the straddle-type vehicle according to claim 1,

the cover (72) covers the clutch (17) from the outside in the axial direction of the axis (C2),

an umbrella body (90) which is in an umbrella shape coaxial with the clutch (17) and can move along the axial direction is arranged in the cover structure of the bestriding vehicle,

when the umbrella body (90) is moved outward in the axial direction and is closest to the cover (72), the second rib (122) overlaps the umbrella body (90) when viewed from a radial direction orthogonal to the axis (C2).

3. The cover structure of the straddle-type vehicle according to claim 2,

the umbrella body (90) has a folded part (90a) folded from the outer peripheral end of the umbrella body (90) toward the cover (72),

a labyrinth structure (124) is formed by the folded-back portion (90a), the first rib (121), and the second rib (122).

4. The cover structure of the straddle-type vehicle according to claim 3,

the folded-back portion (90a) blocks a line (K1) that connects the axial inner end of the first rib (121) and the axial inner end of the second rib (122) when viewed in a cross-section that includes the axis (C2).

5. The cover structure of the straddle-type vehicle according to any one of claims 2 to 4,

a belt (82) having a plurality of convex cogs (82a) is wound around the umbrella body (90),

the cog (82a) has an engaging portion (82b) that engages with the band (82) and a projection (82c) that extends in the radial direction of the umbrella body (90),

when the umbrella body (90) moves inward in the axial direction and is farthest from the cover (72), a gap (125) between the umbrella body (90) and the second rib (122) is set smaller than the engaging portion (82b) and the protruding portion (82 c).

6. The cover structure of the straddle-type vehicle according to any one of claims 2 to 4,

a clutch chamber (123) demarcated by the second rib (122),

the clutch chamber (123) can be opened and closed by the axial movement of the umbrella body (90),

when the number of rotations of the umbrella body (90) is equal to or greater than a threshold value, the umbrella body (90) moves outward in the axial direction and the clutch chamber (123) is closed, and when the number of rotations of the umbrella body (90) is less than the threshold value, the umbrella body (90) moves inward in the axial direction and the clutch chamber (123) is opened.

7. The cover structure of the straddle-type vehicle according to any one of claims 1 to 4,

the cover structure of the saddle-ride type vehicle further includes a radial rib (126) that is radial when viewed in the axial direction and connects the first rib (121) and the second rib (122).

8. The cover structure of the straddle-type vehicle according to any one of claims 1 to 4,

the cover (72) has an exhaust port (136) capable of exhausting air inside the cover (72),

the second rib (122) also serves as a part of a wall (137) forming the exhaust port (136).

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