JP7129450B2 - Straddle-type electric vehicle - Google Patents

Description

The present invention relates to a straddle-type electric vehicle, and more particularly to a straddle-type electric vehicle in which a motor supplied with power from a battery drives rear wheels.

2. Description of the Related Art Conventionally, in straddle-type electric vehicles in which rear wheels are driven by a motor, there has been known a configuration in which the motor is actively cooled using airflow.

Patent Document 1 discloses a straddle-type electric vehicle in which air flow generated by a cooling fan provided in the vehicle body is guided to a motor through an air guide duct.

JP-A-6-247374

However, in the configuration described in Patent Document 1, there is a problem that the production cost increases because it is necessary to provide a cooling fan. development was desired.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems of the prior art and to provide a straddle-type electric vehicle capable of effectively cooling a motor without using a cooling fan.

In order to achieve the above object, the present invention provides a straddle-type electric vehicle (1) in which a rear wheel (WR) is driven by a motor (M) supplied with power from a battery (B). A swing arm (14) for supporting a swing arm (14) and a duct (50) for guiding running air to the motor (M) are provided. A port (51) and a discharge port (52) at the rear end are provided, and the discharge port (52) opens toward the motor (M) and extends across the vehicle width of the duct (50). A first feature is that an inclined portion (53) inclined from the outside in the vehicle width direction toward the motor (M) is provided on the direction outside surface.

A side cover (12) is provided to cover the side of the vehicle body, and when viewed from the front of the vehicle body, the outermost position (a) of the duct (50) is closer to the vehicle than the outermost position (b) of the side cover (12). A second characteristic is that it is positioned on the inner side in the width direction.

A rear end portion of the side cover (12) is formed with a narrowed portion (12a) that is narrowed inward in the vehicle width direction. The third feature is that it is arranged at a position facing the portion (12a).

Further, a rear fender (15) covering at least a part of the motor (M) and the rear wheel (WR) is provided, and a part of the motor (M) is exposed on the side surface of the rear fender (15) when viewed from the side of the vehicle body. A fourth feature is that a notch (34) is provided, and the narrowed portion (12a) extends upward to a position equal to or higher than the height at which the notch (34) is provided. be.

Further, a footrest (11) on which the rider puts his/her foot is provided above the front of the duct (50), and an undercover (40) covering the lower part of the vehicle body is provided below the footrest (11). The rear end of the undercover (40) is formed with a flip-up portion (41) that slopes upward. A fifth feature is that C) is positioned inside the outermost position (D) on the inner side of the duct (50) in the vehicle width direction.

According to the first feature, in a straddle-type electric vehicle (1) in which a rear wheel (WR) is driven by a motor (M) supplied with power from a battery (B), a swing arm that supports the motor (M) is provided. (14), and a duct (50) for guiding running air to the motor (M), and a suction port (51) at the front end of the duct (50) arranged along the front-rear direction. and a discharge port (52) at the rear end, the discharge port (52) opening toward the motor (M) and extending to the outer surface of the duct (50) in the vehicle width direction. Since the inclined portion (53) is provided which is inclined toward the motor (M) from the outside in the vehicle width direction, not only the running wind flowing inside the duct but also the running wind flowing along the outside surface of the duct in the vehicle width direction. can also guide the air to the motor. As a result, it is possible to improve the cooling performance by efficiently blowing air to the motor without providing a cooling fan.

According to the second feature, the side cover (12) is provided to cover the side of the vehicle body, and when viewed from the front of the vehicle body, the outermost position (a) of the duct (50) is the outermost shape of the side cover (12). Since the ducts are located on the inner side in the vehicle width direction from the position (b), the ducts can be laid out without increasing the frontal projected area, so it is possible to improve the cooling performance while preventing an increase in running resistance.

According to the third feature, the rear end of the side cover (12) is formed with a narrowed portion (12a) that is narrowed inward in the vehicle width direction, and the suction port ( 51) is disposed at a position facing the narrowed portion (12a), so that the narrowed portion can efficiently guide the running wind that has flowed along the side cover to the intake port of the duct.

According to the fourth feature, a rear fender (15) covering at least a part of the motor (M) and the rear wheel (WR) is provided, and the motor (M) is mounted on the side surface of the rear fender (15) as viewed from the side of the vehicle body. is provided with a cutout (34) exposing a part of the cutout (34). The narrowed portion provided at the rear end of the side cover enables the notch provided in the rear fender to efficiently take in running wind, thereby improving the cooling performance.

According to the fifth feature, a footrest (11) on which a driver puts his/her foot is provided above and forward of the duct (50), and the lower portion of the vehicle body is covered below the footrest (11). An undercover (40) is provided, and a flip-up portion (41) inclined upward is formed at the rear end of the undercover (40). Since the outermost position (C) in the width direction is positioned inside the outermost position (D) of the duct (50) on the inner side in the vehicle width direction, the raised portion of the undercover is formed between the left and right ducts. By disposing the , it is possible to increase the cooling performance by directing the running wind guided upward by the blow-up portion to the motor along the duct.

1 is a left side view of an electric motorcycle according to an embodiment of the present invention; FIG. It is a right side view of an electric two-wheeled vehicle. 1 is a front view of an electric motorcycle; FIG. Fig. 2 is a partially enlarged rear view of the electric motorcycle; It is a partially enlarged left side view of the electric motorcycle. It is a partially enlarged right side view of the electric motorcycle. Fig. 2 is a perspective view of the electric two-wheeled vehicle as seen from the front right side; Fig. 2 is a perspective view of the electric two-wheeled vehicle as seen from the upper right side; 1 is a perspective view of an electric two-wheeled vehicle as seen obliquely from below; FIG. It is a bottom view of an electric two-wheeled vehicle. 7 is a cross-sectional view taken along line XI-XI of FIG. 6; FIG. 3 is a cross-sectional view taken along the line XII-XII of FIG. 2; FIG. 7 is a cross-sectional view taken along the line XIII-XIII of FIG. 6; FIG. 11 is a cross-sectional view along line XIV-XIV of FIG. 10; FIG.

Preferred embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a left side view of an electric motorcycle 1 according to one embodiment of the present invention. 2 is a right side view of the electric motorcycle 1. FIG. The electric motorcycle 1 is a scooter-type straddle-type electric vehicle that uses an in-wheel motor M built in a rear wheel WR as a power source. A front end portion of the body frame F is provided with a head pipe F2 that rotatably supports a steering stem F1. An underframe F4 extends rearward from the lower end of the main frame F3 extending rearward and downward from the head pipe F2, and a rear frame F5 extends rearward and upward from the rear end of the underframe F4.

A steering handle 3 is fixed to the upper portion of the steering stem F1, and a bottom bridge 7 is fixed to the lower portion of the steering stem F1. A pair of left and right front forks 9 that support the front wheels WF are fixed to the bottom bridge 7 . A front fender 8 that covers the upper part of the front wheel WF is fixed to the front fork 9 . A swing arm 14 that rotatably supports the rear wheel WR is supported by a pivot 13 so as to be swingable with respect to the body frame F. As shown in FIG. A front end upper portion of the swing arm 14 is connected to the vehicle body frame F by a rear cushion 20 . An upper portion of the rear wheel WR is covered with a rear fender 15 fixed to the swing arm 14 .

A pair of left and right rearview mirrors 2 are attached to a handle cover 4 covering the center of the steering handle 3 in the vehicle width direction. The front of the head pipe F2 is covered with a front cover 5 having a headlight 6, and the rear of the head pipe F2 is covered with a leg shield 10 facing the driver's feet. A pair of left and right side covers 12 connected to the front cover 5 are connected to the left and right ends of the low floor 11 as a footrest and extend to cover the pivot 13 on the rear side. A battery B for supplying electric power to the motor M is arranged under the low floor 11 .

An under-seat cowl 19 is provided under the seat 18 , and a rear cowl 17 is connected to the rear portion of the under-seat cowl 19 . A tail light device 16 is attached to the rear end portion of the rear cowl 17 . A pair of left and right ducts 50 (50L, 50R) for guiding running air to cool the motor M is disposed below the swing arm 14. As shown in FIG.

FIG. 3 is a front view of the electric motorcycle 1. FIG. 4 is a partially enlarged rear view of the electric motorcycle 1. FIG. The duct 50 (shown with stippled hatching) is a pipe-shaped part made of synthetic resin or the like and having a substantially rectangular cross section. A brake drum 23 having a diameter smaller than that of the motor M is arranged on the left side of the motor M in the vehicle width direction. The outlet of the duct 50 is open toward the motor M, and cools the motor M by blowing running wind from left and right in the vehicle width direction.

The left and right ducts 50L and 50R are respectively disposed downwardly rearward along the swing arm 14, and are provided with outlets below the rear wheel axle 22. As shown in FIG. An inclined portion 53 that inclines toward the motor M from the outside in the vehicle width direction is provided on the outside surface of the duct 50 in the vehicle width direction. Thus, not only the running wind flowing inside the duct 50 but also the running wind flowing along the outer surface of the duct 50 in the vehicle width direction can be guided to the motor M.

When viewed from the front of the vehicle body, the outermost position a of the duct 50 is located inside the outermost position b of the side cover 12 in the vehicle width direction. As a result, the duct 50 can be laid out without increasing the front projected area, so that the cooling performance can be improved while preventing an increase in running resistance.

A rear fender 15 that covers the upper portion of the rear wheel WR is an integrally molded component made of synthetic resin or the like. A license light 30 , a reflector 31 , and a license plate mounting portion 32 are provided at the rear end portion of the mudguard member 33 . A rear cover 21 connected to the rear cowl 17 is arranged in front of the rear fender 15 and below the tail light device 16 .

FIG. 5 is a partially enlarged left side view of the electric motorcycle 1. FIG. 6 is a partially enlarged right side view of the electric motorcycle 1. FIG. A brake arm 25 and a brake wire 24 are attached to a brake drum 23 provided on the left side of the motor M in the vehicle width direction. The rear fender 15 is of a cantilever type fixed to the swing arm 14 by a support portion 36 on the right side in the vehicle width direction. The support portion 36 is fixed to the swing arm 14 by two fastening members 35 . A notch portion 34 is provided in front of the support portion 36 to introduce running wind and apply it to the motor M. As shown in FIG. A rear end portion of the side cover 12 is formed with a narrowed portion 12a that is narrowed inward in the vehicle width direction.

FIG. 7 is a perspective view of the electric motorcycle 1 as seen from the front right side. FIG. 8 is a perspective view of the electric motorcycle 1 as seen from the upper right side. The narrowed portion 12a provided at the rear end portion of the side cover 12 has a shape in which the rear end edge of the side cover 12 is narrowed inward in the vehicle width direction. By arranging the intake port 51 of the duct 50 close to the narrowed portion 12a, the running wind flowing along the side cover 12 can be positively introduced into the intake port 51 of the duct 50. As shown in FIG. Further, the narrowed portion 12a extends upward to a position equal to or higher than the height at which the cutout portion 34 of the rear fender 15 is provided. As a result, the notch 34 can efficiently take in the running wind, thereby improving the cooling performance.

Furthermore, as described above, by providing the inclined portion 53 inclined from the outside in the vehicle width direction toward the motor M on the outside surface of the duct 50 in the vehicle width direction, not only the running wind flowing inside the duct 50 but also The running wind flowing along the vehicle width direction outer surface of the duct 50 can also be guided to the motor M. As a result, it is possible to efficiently apply running wind to the motor M without providing a cooling fan, thereby improving the cooling performance.

FIG. 9 is a perspective view of the electric motorcycle 1 as seen obliquely from below. 10 is a bottom view of the electric motorcycle 1. FIG. An undercover 40 is provided below the low floor 11 to cover the lower portion of the vehicle body. A rear end of the undercover 40 made of a plate-like member is formed with a flip-up portion 41 that slopes upward. The outermost position c of the flip-up portion 41 in the vehicle width direction is positioned inside the outermost position d of the duct 50 on the inner side in the vehicle width direction. As a result, the blow-up portion 41 of the undercover 40 is arranged between the left and right ducts 50L and 50R, so that the running wind guided upward by the blow-up portion 41 is directed along the duct 50 and applied to the motor. , it is possible to improve the cooling performance.

11 is a cross-sectional view taken along line XI-XI of FIG. 6. FIG. The left duct 50L and the right duct 50R are generally symmetrical. The duct 50 has an inlet 51 located near the narrowed portion 12 a to efficiently introduce the running wind, and then guides the running wind rearward while narrowing the space in the vehicle width direction. It is configured such that running wind is blown to the motor M from an outlet opening inward in the width direction.

12 is a cross-sectional view taken along line XII-XII of FIG. 2. FIG. In this embodiment, the duct 50 is configured to generate three flows of running air to cool the motor M. As shown in FIG. First, the first running wind W1 introduced from the intake port 51 and flowing inside the duct 50 is discharged from the discharge port 52 and comes into contact with the substantially central portion of the motor M. As shown in FIG. Next, by providing the inclined portion 53 on the outer side surface of the duct 50 in the vehicle width direction, the rear portion of the motor M can be cooled by the second wind W2 passing through the outside of the duct 50 . Furthermore, the third running wind W3 guided by the raised portion 41 of the undercover 40 passes through the inside of the duct 50 and cools the front portion of the motor M. As shown in FIG. As a result, it is possible to increase the cooling effect by blowing running winds W1, W2, and W3 to the entire motor M. FIG.

13 is a cross-sectional view taken along the line XIII--XIII of FIG. 6. FIG. The narrowed portion 12a provided at the rear end portion of the side cover 12 can guide the running wind W flowing along the side cover 12 so as to bend inward in the vehicle width direction. This makes it possible to effectively guide the running wind to the intake port 51 of the duct 50 and the notch 34 provided in the rear fender 15 .

14 is a cross-sectional view along line XIV-XIV of FIG. 10. FIG. The rear cushion 20 is arranged behind the low floor 11 and below the storage box 29 . As described above, the rear end portion of the undercover 40 that covers the lower side of the battery B is formed with the flip-up portion 41 that guides the running wind W upwards of the vehicle body. According to the jump-up portion 41, it is possible to guide the running wind between the left and right ducts 50 and cool the position near the front of the motor M. As shown in FIG.

The shape of the motorcycle, the shape and structure of the swing arm, the shape and structure of the duct, the shapes of the side cover and the under cover, etc. are not limited to those of the above embodiments, and various modifications are possible. For example, the duct may have a structure attached to the vehicle body instead of a structure attached to the swing arm. Alternatively, it may be provided integrally with the swing arm or the vehicle body. The motor cooling structure according to the present invention can be applied not only to electric motorcycles, but also to straddle-type three-wheeled vehicles, four-wheeled vehicles, and the like.

REFERENCE SIGNS LIST 1 electric motorcycle (saddle type electric vehicle) 11 low floor (footrest) 12 side cover 12a narrowed portion 14 swing arm 15 rear fender 34 notch 40 Under cover 41 Flip-up portion 50 Duct 51 Suction port 52 Discharge port 53 Inclined portion a Outmost position of duct b Outmost position of side cover c Flip-up d: outermost position of the duct on the inner side in the vehicle width direction, B: battery, M: motor, WR: rear wheel

Claims (3)

In a straddle-type electric vehicle (1) in which a motor (M) supplied with power from a battery (B) drives a rear wheel (WR),
a swing arm (14) supporting the motor (M);
a duct (50) for guiding running wind to the motor (M),
The duct (50) is provided with an inlet (51) at the front end and an outlet (52) at the rear end arranged along the longitudinal direction,
The outlet (52) opens toward the motor (M),
An inclined portion (53) inclined from the outside in the vehicle width direction toward the motor (M) is provided on the outside surface of the duct (50) in the vehicle width direction ,
Having a side cover (12) covering the side of the vehicle body,
When viewed from the front of the vehicle body, the outermost position (a) of the duct (50) is located inside the outermost position (b) of the side cover (12) in the vehicle width direction,
A narrowed portion (12a) that narrows inward in the vehicle width direction is formed at the rear end portion of the side cover (12),
A straddle-type electric vehicle , wherein an inlet (51) of the duct (50) is arranged at a position facing the narrowed portion (12a) . A rear fender (15) covering at least part of the motor (M) and the rear wheel (WR),
A notch (34) is provided on the side surface of the rear fender (15) to expose a part of the motor (M) when viewed from the side of the vehicle body,
The straddle-type electric vehicle according to claim 1 , wherein the narrowed portion (12a) extends upward to a position equal to or higher than the height at which the cutout portion (34) is provided. A footrest (11) on which the driver puts his/her feet is provided above the front of the duct (50),
An undercover (40) covering the lower part of the vehicle body is arranged below the footrest (11),
A flip-up portion (41) inclined upward is formed at the rear end of the undercover (40),
The vehicle width direction outermost position (C) of the flip-up portion (41) is provided so as to be located inside the vehicle width direction innermost outermost position (D) of the duct (50). The straddle-type electric vehicle according to claim 1 or 2 .

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