JP2022191074A - Saddle riding type vehicle - Google Patents

Abstract

To improve aerodynamic characteristics for a rear wheel with a simple configuration.SOLUTION: A reinforcing plate 71 is provided on a main stand 52 located between a front wheel 2 and a rear wheel 3. The reinforcing plate 71 has a rectifying unit 73 projecting downward so that outside air from the front of a vehicle body can be distributed to the right and left in front of the rear wheel 3 when the main stand 52 is in a storage position.SELECTED DRAWING: Figure 1

Description

The present invention relates to a saddle type vehicle.

A straddle-type vehicle is sometimes provided with a main stand between the front wheels and the rear wheels. For example, many scooter-type vehicles employ a main stand. Some vehicles of this type have a main stand reinforced with a reinforcing plate (for example, Patent Document 1).

Japanese Patent No. 6271488

Saddle riding type vehicles are desired to have improved aerodynamic characteristics.
However, providing a separate component for improving the aerodynamic characteristics not only increases the number of components, but also requires securing a mounting space for the components and complicates the mounting structure.
By the way, according to the inventors' studies, in the case of a configuration in which the air cleaner unit is arranged on the side of the rear wheel, when the aerodynamic characteristics of the rear wheel are improved, the outside air flowing into the air cleaner unit from behind increases. found to do. An increase in the air intake amount of the air cleaner unit can be expected by increasing the outside air flowing in from the rear.

SUMMARY OF THE INVENTION The present invention has been made in view of the circumstances described above, and an object of the present invention is to improve the aerodynamic characteristics with respect to the rear wheels with a simple structure. Another object of the present invention is to make it easier to increase the air intake amount of the air cleaner unit by improving the aerodynamic characteristics.

A straddle-type vehicle comprising a vehicle body supporting front wheels, rear wheels, and a power unit, and a main stand positioned between the front wheels and the rear wheels, wherein the main stand is provided with a reinforcing plate, wherein the periphery of the rear wheels is provided. and an air cleaner unit that constitutes part of the intake system of the power unit, and the reinforcing plate can distribute outside air from the front of the vehicle body to left and right in front of the rear wheels when the main stand is in the retracted position. Furthermore, it has a rectifying portion that protrudes downward.

A stiffening plate of the main stand is used to provide a straightening section that distributes outside air from the front of the vehicle body to the left and right in front of the rear wheels, so that the aerodynamic characteristics of the rear wheels can be improved with a simple configuration. Therefore, it contributes to fuel efficiency improvement and _CO2 reduction.

1 is a left side view of a motorcycle according to an embodiment of the invention; FIG. It is the figure which looked at the main stand with the peripheral structure from the left side of the vehicle body. It is the figure which looked at the main stand from the front of the vehicle body with the peripheral structure. It is a perspective view of a main stand. It is the figure which looked at the main stand from the rear side. FIG. 4 is a cross-sectional view of the main stand in the retracted position, together with the peripheral configuration, viewed from the left side of the vehicle body; FIG. 10 is a diagram showing a simulation result of the flow of outside air around the air cleaner unit during running; It is a figure which shows the modification of a rectification|straightening part.

An embodiment of the present invention will be described below with reference to the drawings. In the description, directions such as front, rear, left, right, and up and down are the same as the directions with respect to the vehicle body unless otherwise specified. In each figure, FR indicates the front of the vehicle body, UP indicates the upper side of the vehicle body, and LH indicates the left side of the vehicle body.

FIG. 1 is a left side view of a motorcycle 1 according to an embodiment of the invention.
The motorcycle 1 includes a body frame 10, a front fork 11 supporting a front wheel 2 so as to be steerable, a unit swing type power unit 12 supported at the rear of the body frame 10, and rear wheels 3 so that a rider straddles them. It is a scooter-type saddle-ride type vehicle provided with a seat 13 on which the rider sits. The motorcycle 1 includes a vehicle body cover 14 that covers the vehicle body such as the vehicle body frame 10 .

The body frame 10 includes a head pipe 15 provided at the front end of the body frame 10 , a down frame 16 extending downward from the head pipe 15 , a lower frame 17 extending rearward from the down frame 16 , and rearwardly upward from the lower frame 17 . and an extending seat frame 18 . The vehicle body frame 10 constitutes "a vehicle body that supports the front wheels, the rear wheels 3, and the power unit 12" of the present invention.

The front fork 11 is supported by a head pipe 15 and is provided so as to be steerable left and right around the head pipe 15 . The front wheel 2 is supported by the lower ends of the front forks 11 . A steering handle 20 is attached to the upper end of the front fork 11 .

The power unit 12 is supported by the seat frame 18 so as to be vertically swingable, and extends below the seat frame 18 in the vehicle front-rear direction.
The power unit 12 includes an engine 31, which is an internal combustion engine, and a transmission device 32 that transmits the driving force of the engine 31 to the rear wheel shaft 3A. The engine 31 is an air-cooled single-cylinder four-cycle engine. The transmission device 32 includes a belt-type continuously variable transmission mechanism in a transmission case extending from the rear side (left side in this configuration) of the engine 31 to the side (left side) of the rear wheel 3. It is a configuration that accommodates
The engine 31 may not be a single-cylinder four-cycle engine, and the transmission mechanism may not be a belt-type continuously variable transmission mechanism. A widely distributed configuration can be applied to the engine 31 and the transmission mechanism.

An air cleaner unit 33 that forms part of the intake system of the power unit 12 is arranged above the transmission device 32 and to the side of the rear wheel 3 (left side in this embodiment). Since the air cleaner unit 33 is arranged above the transmission device 32, it is positioned above the rear wheel axle 3A.
As shown in FIG. 1, there is a gap S between the lower surface 33M of the air cleaner unit 33 and the upper surface 32M of the transmission device 32. This gap S opens rearward on the side (left side) of the rear wheel 3. . This gap S passes through the vicinity of an intake port 33A provided in the front portion of the air cleaner unit 33. As shown in FIG.

The air cleaner unit 33 sucks outside air from an intake port 33</b>A provided at the front, cleans the sucked outside air with an air filter, and supplies it to the engine 31 . The intake port 33</b>A is provided on the outer surface in the vehicle width direction of the front portion of the air cleaner unit 33 . The vehicle width direction coincides with the left-right direction of the motorcycle 1 .
The position of the intake port 33A may be changed as appropriate. For example, it may be provided on the lower surface of the front portion of the air cleaner unit 33, or on the inner surface of the front portion of the air cleaner unit 33 in the vehicle width direction. , the rear portion of the air cleaner unit 33, or the like.

A step floor 24 is provided below the seat 13 and behind the head pipe 15 on which the feet of an occupant seated on the seat 13 are placed. The front part of the vehicle body cover 14 includes a front cover 40 that covers the front part of the vehicle body frame 10 from the front, an upper cover 41 that covers the steering wheel 20 from the front above the front cover 40, and covers the front part of the vehicle body frame 10 from the rear. An inner cover 42 and a front fender 43 covering the front wheel 2 from above are provided.
The front cover 40 is positioned above the front wheel 2 and the front fender 43 . A lamp 44 such as a headlight is provided under the front cover 40 . The front fender 43 is attached to the front fork 11 .

The rear portion of the vehicle body cover 14 includes a rear cover 46 that covers the left and right sides of the seat frame 18, and a rear fender 47 that covers the rear wheel 3 from above. A rear inner fender 48 is arranged between the rear cover 46 and the rear wheel 3 to cover the rear wheel 3 from above. The rear inner fender 48 is provided at a position overlapping the air cleaner unit 33 when viewed from the side of the vehicle body, and swings up and down integrally with the power unit 12 .

A side stand 51 is provided at the lower part of the front-rear center between the front wheel 2 and the rear wheel 3 . A main stand 52 is provided between the side stand 51 and the rear wheel 3 .
The side stand 51 is provided at a position offset to one of the left and right sides (the left side in this configuration), and is formed as a one-leg type stand that can move between an upright position and a retracted position. This side stand 51 is supported by the lower frame 17 so as to be positioned on the lower left side of the step floor 24 . By setting the side stand 51 to the standing position, the side stand 51 stands on the road surface while the vehicle body is tilted to one of the right and left sides (left side), and the vehicle body can be placed in a self-supporting state (parking state). Note that FIG. 1 shows a case where the side stand 51 is in the retracted position.

FIG. 2 is a view of the main stand 52 and its peripheral components as seen from the left side of the vehicle body. FIG. 3 is a view of the main stand 52 and its peripheral components as seen from the front of the vehicle body.
The main stand 52 is formed as a two-leg type stand movable between a standing position and a retracted position, and is positioned below the power unit 12 . 2 and 3, the main stand 52 in the upright position is indicated by reference numeral 52(A), and the main stand 52 in the retracted position is indicated by reference numeral 52(B).
By setting the main stand 52 to the upright position indicated by reference numeral 52(A), the vehicle can be parked without tilting the vehicle body to the left or right. The main stand 52 is sometimes called a center stand and a two-leg stand.

In FIG. 2, reference numeral 60 denotes a support shaft that supports the main stand 52 on the vehicle body side. The support shaft 60 is a shaft extending in the vehicle width direction, and the main stand 52 rotates with the support shaft 60 as a reference between the upright position and the retracted position.
The support shaft 60 is positioned rearwardly and downwardly of the bottom surface 31X of the crankcase of the engine 31 . When the main stand 52 rotates toward the standing position, a portion of the main stand 52 (a portion of the reinforcement plate 71 described later) contacts the bottom surface 31X of the crankcase, thereby stopping the main stand 52 at the standing position. do.

As shown in FIG. 2, the main stand 52 is positioned lower than the height X1 of the rear wheel axle 3A located at the center of the rear wheel 3 and the transmission device 32 in both the upright position and the retracted position, and , located in front of the front-rear position Y1 of the rear wheel axle 3A. Since the main stand 52 rotates back and forth with reference to the support shaft 60 positioned at the rear lower side of the crankcase of the engine 31, the main stand 52 extends rearward from the support shaft 60 at the retracted position. Therefore, in the retracted position, the front portion of the main stand 52 extends between the crankcase and the rear wheel 3, and the rear portion of the main stand 52 overlaps the left and right front portions of the rear wheel 3 when viewed from the side of the vehicle body. In FIG. 2, the transmission device 32 and the air cleaner unit 33 are indicated by two-dot chain lines.
As shown in FIG. 3, the main stand 52 has a symmetrical shape with respect to the vehicle width center C1 when viewed from the front of the vehicle body. Overlap.

4 is a perspective view of the main stand 52. FIG. FIG. 5 is a view of the main stand 52 as seen from the rear side. FIG. 6 is a cross-sectional view of the main stand 52 in the retracted position as viewed from the left side of the vehicle body together with the peripheral configuration.
As shown in FIGS. 4 and 5, the main stand 52 includes a cylindrical insertion member 53 that is inserted into the support shaft 60, and left and right legs that extend downward from the insertion member 53 at intervals in the vehicle width direction. and a cylindrical bridging member 55 bridging the left and right leg portions 54 at a position away from the insertion member 53 . These members 53 to 55 are made of cylindrical pipes made of metal, for example, and joined together by welding or the like. The bridging member 55 is curved upward when viewed from the rear of the vehicle body. The shape of the bridging member 55 is not particularly limited, and for example, the bridging member 55 may be linear in the width direction of the vehicle body when viewed from the rear of the vehicle body.

A lever member 56 that extends outward (to the left) in the vehicle width direction is joined to one of the leg portions 54 . As shown in FIG. 3, the lever member 56 is formed in a shape that curves upward on the outer side in the vehicle width direction when the main stand 52 is in the retracted state, as viewed from the front of the vehicle body. A step portion 56A that can be stepped on by a user (passenger, etc.) is provided at the outer end portion of the lever member 56 in the vehicle width direction. The user can set the main stand 52 to the standing position by operating the step portion 56A. The lever member 56 is made of, for example, a metal cylindrical pipe, and the step portion 56A is made of, for example, a metal plate.

The main stand 52 has a reinforcing plate 71 that reinforces the main stand 52 . The reinforcement plate 71 includes a flat reinforcement plate body 72 that bridges between the left and right leg portions 54 , a straightening portion 73 provided in the center of the reinforcement plate body 72 in the width direction, and left and right ends of the reinforcement plate body 72 . and a guard member 75 (rectifying section guard member). In this embodiment, the reinforcing plate 71 is manufactured by bending a single metal plate. However, the reinforcing plate 71 may be manufactured from a plurality of plate materials or the like.

The reinforcing plate main body 72 includes a plate-like first plate portion 72A that bridges between the legs 54 in the vicinity of the insertion member 53, and a lower edge of the first plate portion 72A (edge opposite to the insertion member 53). A plate-like second plate portion 72B is provided.
The first plate portion 72A and the second plate portion 72B are joined to the front surfaces of the left and right leg portions 54 by welding or the like. Therefore, the first plate portion 72A and the second plate portion 72B are positioned in front of the foot portion 54 and the bridging member 55 when the main stand 52 is in the upright position, and are positioned in front of the foot portion 54 and the bridging member 55 when the main stand 52 is in the retracted position. It is located below the portion 54 and the bridging member 55 .

When the main stand 52 is in the upright position, the first plate portion 72A forms an inclined wall that slopes forward and downward at the center in the vehicle width direction (see FIG. 4, etc.), and when the main stand 52 is in the retracted position, the wall is downward and rearward. becomes an inclined wall that inclines toward (see FIG. 2, etc.). When the motorcycle 1 is running, the first plate portion 72A forms a slanted wall that is slanted rearwardly and downwardly, so that traveling wind composed of outside air from the front of the vehicle body can be smoothly guided rearwardly and downwardly in front of the rear wheel 3. .

The first plate portion 72A functions as a stopper that stops the main stand 52 at the upright position by coming into contact with the bottom surface 31X (FIGS. 1 and 2) of the crankcase of the engine 31 when the main stand 52 is in the upright position. do. As shown in FIG. 3, the first plate portion 72A is positioned to overlap the front surface of the rear wheel 3 when viewed from the front of the vehicle body. are manufactured identically.

As shown in FIG. 4, the second plate portion 72B is a plate-like member that bends from the lower edge of the first plate portion 72A and protrudes outward in the vehicle width direction from the first plate portion 72A. The second plate portion 72B forms a vertical wall in front of the rear wheel 3 when the main stand 52 is in the upright position, and forms a horizontal wall in front of the rear wheel 3 when the main stand 52 is in the retracted position. Since the second plate portion 72B serves as a horizontal wall when the motorcycle 1 is running, it does not block the flow of running wind from the front of the vehicle body. As shown in FIG. 5 , the second plate portion 72B is provided at a position overlapping the bridge member 55 in the front-rear direction of the main stand 52 . Therefore, when the main stand 52 is in the upright position, the bridging member 55 is covered by the second plate portion 72B from the front of the vehicle body, and when the main stand 52 is in the retracted position, the bridging member 55 is covered by the second plate portion 72B from below the vehicle body. will be

As shown in FIG. 6, the rectifying portion 73 is a wall projecting downward in front of the rear wheel 3 when the main stand 52 is in the retracted position. As shown in FIG. 3 , the rectifying portion 73 is positioned at the center in the vehicle width direction and between the left and right leg portions 54 of the main stand 52 when viewed from the front of the vehicle body. Further, as shown in FIG. 2, the rectifying portion 73 is positioned below the bottom surface 31X of the crankcase of the engine 31 when viewed from the side of the vehicle body. Therefore, when the motorcycle 1 is running, the running wind flowing toward the rear wheel 3 below the power unit 12 can be guided toward the left and right sides of the rear wheel 3 by the front surface 73F of the straightening section 73 .

More specifically, as shown in FIG. 4, when the main stand 52 is in the upright position, the straightening portion 73 is manufactured by curving a plate-like portion connected to the lower edge of the second plate portion 72B into an upward convex shape. ing. As shown in FIG. 5, the lowermost surface of the straightening portion 73 is formed on a surface along an upwardly convex circular arc α (which can also be called a U-shaped curve), and the straightening portion 73 and the second plate portion 72B is also shaped along the arc α.

In this configuration, the boundary β between the rectifying portion 73 and the second plate portion 72B overlaps with the lower surface of the bridging member 55 when viewed from the rear of the vehicle body shown in FIG. overhang. Here, since the rectifying portion 73 has a bent shape in the side view of the main stand 52 and also has a bent shape (also referred to as a curved shape) in the width direction of the main stand 52, the rectifying portion 73 is not provided. The bending rigidity of the reinforcing plate 71 can be increased as compared with the case. Therefore, the reinforcement effect of the main stand 52 by the reinforcement plate 71 can be effectively enhanced.

Further, when the main stand 52 is in the upright position, the upper surface of the rectifying portion 73 is an upwardly convex surface. Therefore, it becomes difficult for rainwater or the like from above to accumulate in the rectifying portion 73 .
Further, when the main stand 52 is in the retracted position, the front surface 73F (see FIG. 6) of the rectifying portion 73 forms a forward convex wall surface in plan view of the vehicle body. As a result, the running wind from the front of the vehicle body can be distributed smoothly to the left and right in front of the rear wheels 3. - 特許庁As shown in FIG. 3, the width of the rectifying portion 73 is smaller than the width of the rear wheel 3, so that the increase in air resistance due to the rectifying portion 73 is suppressed, and the running wind that directly hits the front surface of the rear wheel 3 is reduced. It is possible to

In addition, the front surface 73F of the rectifying portion 73 has a forward convex U-shaped curved surface in which the center in the vehicle width direction is located furthest forward in a plan view of the vehicle body, and gradually becomes rearward toward the outer side in the vehicle width direction. As a result, the running wind from the front of the vehicle body can be easily and evenly and smoothly distributed to the left and right sides of the rear wheel 3. - 特許庁
Note that the width of the rectifying portion 73, the amount of downward protrusion, and the like may be changed as appropriate. Also, the case where the front surface 73F of the rectifying portion 73 is formed into a curved surface along a forward convex arc (=a forward convex U-shaped curved surface) has been described, but a polygonal surface along the arc has been described. can be formed to

Here, the power unit 12 , the body cover 14 , the rear inner fender 48 and the like are positioned above the main stand 52 and in front of the rear wheel 3 . Therefore, above the main stand 52, the running wind from the front of the vehicle body does not directly hit the front surface of the rear wheel 3, or the amount of direct contact is small.
Therefore, in this configuration, by providing the main stand 52 with the rectifying section 73 that rectifies the outside air toward the rear wheels 3 , the outside air toward the rear wheels 3 can be sufficiently rectified. As a result, it becomes easier to obtain appropriate aerodynamic characteristics for the rear wheel 3 .

For example, the rectifying section 73 can suppress turbulence caused by running wind that directly hits the front of the rear wheels 3, which is advantageous for reducing air resistance, contributing to improved fuel efficiency and reduced _CO2 emissions.
In this way, since the outside air flowing under the power unit 12 toward the rear wheel 3 is rectified, the effect of suppressing the outside air from affecting the flow of the outside air in the space above the main stand 52 is also obtained. For example, since the air cleaner unit 33 is positioned rearwardly and upwardly of the power unit 12, the straightening section 73 makes it easy to suppress the situation in which the running wind below the power unit 12 affects the flow of outside air around the air cleaner unit 33. Become.

As a result of studies conducted by the inventors through simulations and the like, it has been found that the provision of the straightening section 73 has the effect of increasing the flow of outside air from the rear of the air cleaner unit 33 .
FIG. 7 is a diagram showing simulation results of the flow of outside air around the air cleaner unit 33 during running. Symbol A in FIG. 7 is a diagram showing the flow of outside air when the rectifying section 73 is not provided, obliquely below the air cleaner unit 33 . Reference character B in FIG. 7 is a diagram showing the flow of outside air when the straightening section 73 is provided, obliquely below the air cleaner unit 33 .

As indicated by symbols A and B in FIG. 7 , outside air W1 from the front of the vehicle and outside air W2 from the rear of the air cleaner unit 33 flow into the intake port 33A of the air cleaner unit 33 . The outside air W1 is part of the running wind that has flowed into the front of the air cleaner unit 33 . The outside air W2 includes outside air that has flowed into the intake port 33A through the gap S between the lower surface 33M of the air cleaner unit 33 and the upper surface 32M of the transmission device 32. As shown in FIG.

As shown by area Z in FIG. 7 , outside air W2 increases when the straightening unit 73 is provided compared to when the straightening unit 73 is not provided. Increased inspiratory volume from Therefore, the provision of the rectifying section 73 is more advantageous for improving the intake efficiency.

7 is a traveling wind that flows rearward above the main stand 52 and on the side of the vehicle body at a higher speed than the outside air W1 and W2. W4A is the traveling wind that flows rearward under the power unit 12 at a higher speed than the outside air W1, W2. This is the running wind that flows backward.
The outside air W3, W4A, and W4B are indicated by dashed lines so as to be easily distinguished from the outside air W1, W2 indicated by solid lines. Outside air flows other than the outside air W1, W2, W3, W4A, and W4B (mainly the outside air flow around the rear portion of the rear wheel 3) are indicated by dashed lines. The outside air indicated by the dashed line is flowing at a lower speed than the outside air W3, W4A and W4B. The flow of outside air W2 is also shown in FIG.

Next, the left and right guard members 75 provided on the reinforcing plate 71 will be described.
As shown in FIGS. 4 and 5, the left and right guard members 75 are manufactured by bending portions located at both left and right ends of the second plate portion 72B of the reinforcing plate body 72 . The left and right guard members 75 are symmetrical with respect to a plane passing through the vehicle width center C1.

As shown in FIG. 6, each guard member 75 is formed in a shape that protrudes forward and downward in the vehicle body beyond the straightening portion 73 in a side view of the vehicle body when the main stand 52 is in the retracted position. As a result, when the motorcycle 1 is running, a projection or the like on the road surface contacts the guard member 75 before the projection or the like on the road surface contacts the rectifying portion 73 . Therefore, deformation and damage of the straightening portion 73 can be avoided.

As shown in FIG. A surface 75</b>F of each guard member 75 , which is the front surface when the main stand 52 is in the retracted position, is formed in an inclined surface forward of the straightening section 73 and inclined rearward and downward. Further, each guard member 75 has a surface 75</b>R that becomes a rear surface when the main stand 52 is in the retracted position, and is formed on a surface that is further rearward than the rectifying portion 73 .
In this way, each guard member 75 is formed to be larger in the front-rear direction than the rectifying portion 73, so that it is possible to effectively prevent a situation in which a projection on the road surface or the like contacts the rectifying portion 73 from the front-rear direction.

In addition, since the front surface 75F is inclined downward, the motorcycle 1 can easily get over the contact member in contact with the surface 75F when the motorcycle 1 is running.
Thus, each guard member 75 functions as a rectifying section guard member that guards the rectifying section 73 . Guard member 75 can also be referred to as a skid plate, an underguard, and an underprotector.

As shown in FIG. 3 , each guard member 75 is located outside the straightening portion 73 and the rear wheel 3 in the vehicle width direction when viewed from the front of the vehicle body. As a result, each guard member 75 does not impede the rectifying effect of the rectifying portion 73, and it is possible to suppress the situation in which the running wind flowing from the front of the vehicle body toward the rear wheels 3 is affected.
As shown in FIG. 4, each guard member 75 is formed in an inclined shape that inclines outward in the vehicle width direction from the base end of the main stand 52 toward the tip (corresponding to the lower end in the standing position). It is Therefore, when the main stand 52 is in the retracted position, each guard member 75 serves as an inclined plate that inclines outward in the vehicle width direction toward the rear of the vehicle body. Therefore, a projection on the road surface can easily come into contact with one of the guard members 75, and a flying object or the like flying toward each guard member 75 from the front of the vehicle body or the like can be easily removed to the outside in the vehicle width direction.

Each guard member 75 is small and has an acute angle (less than 45°) in the horizontal direction with respect to the longitudinal direction of the vehicle body. Therefore, the increase in air resistance due to each guard member 75 is sufficiently avoided. The shape, size, position and number of each guard member 75 may be changed as appropriate within the range of having a sufficient guard effect.

As described above, the motorcycle 1 of this embodiment is provided with the reinforcement plate 71 on the main stand 52 and the air cleaner unit 33 on the side of the rear wheel 3 . The reinforcing plate 71 has a rectifying portion 73 that protrudes downward so that external air from the front of the vehicle body can be distributed to the left and right in front of the rear wheels 3 when the main stand 52 is in the retracted position. According to this configuration, the reinforcing plate 71 of the main stand 52 is used to provide the rectifying section 73 that distributes the outside air from the front of the vehicle body to the left and right in front of the rear wheels 3. It is possible to avoid an increase in the number of parts, the need to secure a mounting space for parts, and the complication of the mounting structure. Therefore, it is possible to improve the aerodynamic characteristics with respect to the rear wheels 3 with a simple configuration, which contributes to the improvement of fuel consumption and the reduction of _CO2 .

Further, since the reinforcement plate 71 of the main stand 52 is used to improve the aerodynamic performance for the rear wheel 3, the effect of increasing the outside air W2 from behind the air cleaner unit 33 can be expected as shown in FIG. Therefore, the effect of increasing the air intake amount of the air cleaner unit 33 can be expected.
Although the air cleaner unit 33 is arranged at the position shown in FIG. 1, the position of the air cleaner unit 33 may be changed. For example, by improving the aerodynamic performance of the rear wheel 3 by using the reinforcing plate 71, the flow of outside air around the rear wheel 3 including the sides of the rear wheel 3 changes compared to the conventional art. The position of the air cleaner unit 33 may be changed within a range where the effect of increasing the air intake amount of the air cleaner unit 33 using the flow of outside air around the rear wheel 3 can be obtained. Therefore, the air cleaner unit 33 may be changed around the rear wheel 3 including areas other than the sides of the rear wheel 3, and may be arranged on the left and right, in front of, or above the rear wheel 3, for example.

If the purpose is only to obtain aerodynamic characteristics for the rear wheel 3 by using the reinforcing plate 71, the position of the air cleaner unit 33 may be arbitrary.
In the present embodiment, when the main stand 52 is in the retracted position, the front surface 73F of the rectifying section 73 is a wall surface having a forward convex shape in plan view of the vehicle body. It can be distributed smoothly to the left and right of the wheel 3. In this case, compared with the case where the rectifying portion 73 has a planar shape extending linearly in the vehicle width direction, the bending rigidity of the reinforcing plate 71 can be easily increased.

Moreover, since the front surface 73F of the rectifying portion 73 is formed in a curved surface that curves forward convexly with the position at the center of the vehicle width as the front end, the external air flowing from the front of the vehicle toward the rear wheels 3 is distributed evenly to the left and right of the rear wheels 3. It becomes easier to distribute to Since the rectifying portion 73 has a curved shape, the bending rigidity of the reinforcing plate 71 can be effectively increased, and the necessary rigidity of the reinforcing plate 71 and the necessary rigidity of the main stand 52 can be easily obtained.

In addition, when the main stand 52 is in the upright position, the upper surface of the flow straightening portion 73 (the surface corresponding to the front surface 73F) is an upwardly convex surface, so rainwater or the like from above is less likely to accumulate in the straightening portion 73. As shown in FIG. 5, this curved shape follows the bridging member 55 of the main stand 52, so that the reinforcing plate 71 can easily cover the bridging member 55. Therefore, the bridging member 55 is prevented from being exposed to the outside. Also, it is possible to avoid a situation in which objects scattered from below the vehicle come into contact with the bridging member 55 or the like while the vehicle is running.

Further, when the main stand 52 is in the retracted position, as shown in FIGS. 1 to 3, the straightening section 73 is located below the power unit 12 and is wider than the width of the rear wheels 3 when viewed from the front of the vehicle body. is also within a narrow range. According to this configuration, it is possible to guide outside air flowing toward the rear wheels 3 below the power unit 12 to the left and right of the rear wheels 3 while suppressing an increase in air resistance due to the straightening section 73 .

Furthermore, the air cleaner unit 33 is arranged above the lower surface of the power unit 12 . In this case, since the running wind below the power unit 12 does not directly hit the rear wheels 3 due to the straightening section 73, the situation in which the running wind directly hits the rear wheels 3 and affects the air intake of the air cleaner unit 33 is avoided. can be suppressed.

Further, the reinforcing plate 71 has a guard member 75 functioning as a rectifying section guard member that protrudes forward and downward of the vehicle body more than the rectifying section 73 when the main stand 52 is in the retracted position. The guard member 75 can prevent a bump on the road surface from coming into contact with the rectifying section 73 , making it easier to avoid deformation and damage to the rectifying section 73 .

Furthermore, as shown in FIG. 3, the guard member 75 is located outside the straightening portion 73 and the rear wheel 3 in the vehicle width direction when viewed from the front of the vehicle body. According to this configuration, the guard member 75 does not hinder the rectification of the rectification portion 73 , and it becomes easy to suppress the situation in which the flow of the running wind that hits the rear wheels 3 directly is affected.

Note that the above-described embodiment is one aspect of the present invention, and the present invention is not limited to the above-described embodiment. For example, the shape of the straightening section 73 may be modified.
FIG. 8 is a diagram showing a modification of the rectifying section 73. As shown in FIG. 8 differs from FIG. 8 in that when the main stand 52 is in the retracted position, the rectifying portion 73 is formed in a U-shape opening at the front side of the vehicle body as viewed from the side of the vehicle body. According to this configuration, the bending rigidity of the straightening portion 73 can be increased compared to the straightening portion 73 shown in FIG.

Further, although the case where the present invention is applied to the motorcycle 1 shown in FIG. 1 has been described, it is not limited to this, and the present invention can be applied to motorcycles other than scooter types, as well as saddle-riding types including three-wheeled and four-wheeled types. It can be applied to vehicles.

[Configuration supported by the above embodiment]
The above embodiment supports the following configurations.

(Configuration 1) A straddle-type vehicle comprising a vehicle body supporting front wheels, rear wheels, and a power unit, and a main stand positioned between the front wheels and the rear wheels, wherein the main stand is provided with a reinforcing plate, An air cleaner unit forming part of the intake system of the power unit is provided around the rear wheels, and the reinforcing plate directs outside air from the front of the vehicle body forward of the rear wheels when the main stand is in the retracted position. A saddle-ride type vehicle characterized by having a rectifying section projecting downward so as to be distributed to the left and right.
According to this configuration, it is possible to improve the aerodynamic characteristics with respect to the rear wheels with a simple configuration. Therefore, it contributes to fuel efficiency improvement and _CO2 reduction. In addition, it is possible to suppress the situation where outside air from the front of the vehicle body touches the rear wheels above the main stand, so if you want to place the air cleaner unit above the main stand, the effect of increasing the outside air from behind the air cleaner unit. can be expected. Therefore, it becomes easier to increase the air intake amount of the air cleaner unit.

(Arrangement 2) The straddle-type vehicle according to Arrangement 1, wherein when the main stand is in the retracted position, the front surface of the rectifying section is a wall surface having a forward convex shape in plan view of the vehicle body.
According to this configuration, outside air directed from the front of the vehicle body to the rear wheels can be smoothly distributed to the left and right of the rear wheels, and the bending rigidity of the reinforcing plate can be easily increased.

(Arrangement 3) The saddle-ride type vehicle according to Arrangement 2, wherein the forwardly convex wall surface is a curved surface that curves forwardly with the position of the center of the width of the vehicle as the front end.
According to this configuration, the outside air directed from the front of the vehicle body toward the rear wheels can be distributed evenly and smoothly to the left and right of the rear wheels, and the bending rigidity of the reinforcing plate can be easily increased.

(Arrangement 4) When the main stand is in the retracted position, the straightening section is positioned below the power unit, and is positioned in a range narrower than the lateral width of the rear wheels when viewed from the front of the vehicle body. Straddle type vehicle according to any one of configurations 1 to 3.
According to this configuration, it is possible to guide outside air flowing below the power unit toward the rear wheels to the left and right of the rear wheels while suppressing an increase in air resistance due to the straightening section.

(Arrangement 5) The straddle-type vehicle according to Arrangement 4, wherein the air cleaner unit is arranged above the lower surface of the power unit.
According to this configuration, the running wind below the power unit does not directly hit the rear wheels by the rectifying section, so it is possible to suppress the situation in which the running wind directly hits the rear wheels and affects the air intake of the air cleaner unit. . As a result, the effect of increasing outside air from the rear of the air cleaner unit can be expected, making it easier to increase the air intake amount of the air cleaner unit.

(Arrangement 6) The saddle-ride type vehicle according to any one of Arrangements 1 to 5, wherein when the main stand is in the upright position, the upper surface of the rectifying portion is an upwardly convex surface.
According to this configuration, it becomes difficult for rainwater or the like from above to accumulate in the straightening section.

(Configuration 7) Any one of Configurations 1 to 6, wherein the reinforcing plate has a straightening section guard member that protrudes forwardly and downwardly of the vehicle body more than the straightening section when the main stand is in the retracted position. A straddle-type vehicle according to item 1.
According to this configuration, it is possible to suppress a situation in which a projection on the road surface or the like contacts the straightening section.

(Arrangement 8) The saddle-ride type vehicle according to Arrangement 7, wherein the straightening section guard member is positioned outside the straightening section and the rear wheel in the vehicle width direction when viewed from the front of the vehicle body.
According to this configuration, the straightening section guard member does not hinder the straightening of the straightening section, and it becomes easy to suppress a situation in which it affects the flow of running air that hits the rear wheels directly.

1 Motorcycle (saddle type vehicle)
2 front wheels 3 rear wheels 3A rear wheel axle 10 vehicle body frame (vehicle body)
12 Power Unit 33 Air Cleaner Unit 33A Intake Port 51 Side Stand 52 Main Stand 53 Penetrating Member 54 Foot Portion 55 Bridging Member 71 Reinforcement Plate 72 Reinforcement Plate Main Body 72A First Plate Section 72B Second Plate Section 73 Straightening Section 73F Front of Straightening Section 75 Guard Member (clear stream part guard member)

Claims (8)

A vehicle body (10) supporting a front wheel (2), a rear wheel (3) and a power unit (12), and a main stand (52) positioned between the front wheel (2) and the rear wheel (3), In the straddle-type vehicle in which the main stand (52) is provided with a reinforcing plate (71),
An air cleaner unit (33) forming part of an intake system of the power unit (12) is provided around the rear wheel (3),
When the main stand (52) is in the retracted position, the reinforcing plate (71) has a rectifying portion ( 73). The saddle-riding according to claim 1, characterized in that, when the main stand (52) is in the retracted position, the front surface (73F) of the rectifying section (73) is a forward convex wall surface in plan view of the vehicle body. type vehicle. 3. The saddle-ride type vehicle according to claim 2, wherein the forwardly convex wall surface is a curved surface that curves forwardly with the position of the center of the width of the vehicle as a front end. When the main stand (52) is in the retracted position, the rectifying section (73) is located below the power unit (12) and is wider than the width of the rear wheel (3) when viewed from the front of the vehicle body. A straddle-type vehicle according to any one of claims 1 to 3, characterized in that it is positioned in a narrow range. The straddle-type vehicle according to claim 4, wherein the air cleaner unit (33) is arranged above the lower surface of the power unit (12). The saddle-riding according to any one of claims 1 to 5, characterized in that, when the main stand (52) is in the upright position, the upper surface of the straightening section (73) is an upwardly convex surface. type vehicle. The reinforcing plate (71) has a rectifying section guard member (75) projecting forward and downward of the vehicle body more than the rectifying section (73) when the main stand (52) is in the retracted position. The straddle-type vehicle according to any one of claims 1 to 6. The saddle-riding according to claim 7, wherein the rectifying section guard member (75) is positioned outside the rectifying section (73) and the rear wheel (3) in the vehicle width direction when viewed from the front of the vehicle body. type vehicle.

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