JP6661968B2 - Drainage structure of electric motorcycle - Google Patents

Description

  The present invention relates to a drainage structure for an electric motorcycle.

  2. Description of the Related Art An electric vehicle including an electric motor that drives rear wheels in a unit case as a swing arm and a motor driver that controls electric power supplied to the electric motor is known (for example, see Patent Document 1).

  This electric vehicle includes a cover member attached to the lower surface of the swing arm. The motor driver is housed inside the cover member. A drain hole for discharging moisture is provided at a lower portion of the cover member toward the rear side of the vehicle body.

JP 2010-247811A

  In a conventional electric vehicle, drainage holes provided in a lower portion of the cover member achieve ventilation between inside and outside of the cover member and drainage of moisture generated in the cover member.

  However, the drain hole that is always open not only drains the water inside the cover member, mainly condensed water, but also allows foreign substances such as water and dust splashed by the wheels during traveling to enter the inside of the cover member. is there.

  On the other hand, a motor driver, specifically, an electronic or electric device such as an inverter or a motor generates heat during operation. Therefore, it is preferable that the space inside the swing arm in which these are stored has air permeability. However, when outside air is ventilated inside the swing arm, condensed water due to dew condensation may be generated inside the swing arm. Although dew condensation can be avoided by increasing the opening area of the drain hole to increase the air permeability, in this case, it is difficult to prevent entry of foreign substances such as water and dust splashed during traveling.

  That is, it is difficult for the drainage hole provided at the lower part of the cover member to achieve both air permeability and drainage, as in a conventional electric vehicle.

  In view of the above, the present invention reliably prevents air and water splashed during traveling from entering a space for storing electric and electronic devices such as a motor and an inverter, while ensuring air permeability and drainage in the swing arm. We propose a drainable structure for electric motorcycles that can be used.

In order to solve the above-mentioned problems, a drainage structure for an electric motorcycle according to the present invention includes a hollow swing arm body that supports a driving wheel, an inverter housed in the swing arm body, and a housed inside the swing arm body. And an electric motor for rotating the driving wheels with electric power supplied from the inverter, and an electric motor provided on an upper part of the swing arm main body and directly connecting an inner side of the swing arm main body and an outer side of the swing arm main body. A breather cap for balancing a pressure difference between the inside and outside of the swing arm body, a drain provided at a lower portion of the swing arm body, and a drain hole for discharging moisture in the swing arm body, and detachably attached to the drain. a drain plug that is, provided on the bottom surface of the swing arm body, the drain plug It has no a plurality of radiating fins, a.

  ADVANTAGE OF THE INVENTION According to this invention, while ensuring the air permeability and drainage in the swing arm, it is possible to reliably prevent water, dust, etc., splashed during traveling from entering the space for storing electric and electronic devices such as motors and inverters. It is possible to provide a water draining structure for an electric motorcycle that can be used.

1 is a left side view of an electric motorcycle to which a drainage structure according to an embodiment of the present invention is applied. FIG. 1 is a left side view showing a state where an exterior and the like of an electric motorcycle to which a water drainage structure according to an embodiment of the present invention is applied is removed. FIG. 1 is a perspective view showing a state in which an exterior and the like of an electric motorcycle to which a water drainage structure according to an embodiment of the present invention is applied is removed. FIG. 2 is a perspective view of a swing arm of the electric motorcycle according to the embodiment of the present invention. FIG. 2 is a left side view of the swing arm of the electric motorcycle according to the embodiment of the present invention. FIG. 2 is a perspective view of a drainage structure of the electric motorcycle according to the embodiment of the present invention, and is an enlarged view near a breather cap. FIG. 2 is a perspective view of a drainage structure of the electric motorcycle according to the embodiment of the present invention, and is an enlarged view near a drain hole. FIG. 2 is a perspective view of a drainage structure of the electric motorcycle according to the embodiment of the present invention, and is an enlarged view near a drain hole.

  Hereinafter, an embodiment of a drainage structure for an electric motorcycle according to the present invention will be described with reference to FIGS. 1 to 8.

  FIG. 1 is a left side view of an electric motorcycle to which a drainage structure according to an embodiment of the present invention is applied.

  FIG. 2 is a left side view of the electric motorcycle to which the drainage structure according to the embodiment of the present invention is applied, in a state where an exterior or the like (a cover or a seat) is removed.

  FIG. 3 is a perspective view showing the electric motorcycle to which the drainage structure according to the embodiment of the present invention is applied, in a state where an exterior (a cover or a seat) is removed.

  The expressions of front, rear, up, down, left, and right in the present embodiment are based on the occupant of the electric motorcycle 1. 1 to 3, a solid arrow F indicates the front of the electric motorcycle 1, and a solid arrow R indicates the rear of the electric motorcycle 1.

  As shown in FIGS. 1 to 3, an electric motorcycle 1 as an electric motorcycle according to the present embodiment is a vehicle that generates electric power by a fuel cell 2 and drives a motor 3 with the electric power to travel. The electric motorcycle 1 is a scooter-type motorcycle.

  The electric motorcycle 1 includes a vehicle body 5 extending forward and backward, a front wheel 6 as a steering wheel, a steering mechanism 7 for supporting the front wheel 6 so as to be steerable, a rear wheel 8 as a driving wheel, and swinging the rear wheel 8 in a vertical direction. A swing arm 9 that freely supports the motor 3 and a motor 3 that generates a driving force for the rear wheel 8 are provided.

  The vehicle body 5 includes a frame 11 extending in the front-rear direction of the vehicle, an exterior 12 covering the frame 11, and a seat 13 disposed above the rear half of the frame 11.

  The vehicle body 5 includes a fuel cell 2, a fuel tank 15 for storing a high-pressure gas of hydrogen as a fuel used for power generation in the fuel cell 2, a secondary battery 16 for assisting the power of the fuel cell 2, A power management device 17 that controls the adjustment of the output voltage of the battery 2 and the distribution of power between the fuel cell 2 and the secondary battery 16, and converts DC power output from the power management device 17 into three-phase AC power to the motor 3. An inverter 18 that outputs and drives the motor 3 and a vehicle controller 19 that manages the inverters 18 are provided.

  The power train of the electric motorcycle 1 has a fuel cell 2 and a secondary battery 16, and is a system that appropriately uses the power of each battery depending on the running state of the vehicle, the power generation state of the fuel cell 2, and the storage state of the secondary battery 16. is there. Further, the electric motorcycle 1 generates regenerative electric power by the motor 3 when decelerating. A secondary battery 16 and a fuel cell 2 that are power sources of the vehicle are connected in parallel to an inverter 18 to supply power to the motor 3. The secondary battery 16 stores regenerative electric power generated by the motor 3 when the electric motorcycle 1 decelerates and electric power generated by the fuel cell 2.

  The frame 11 is formed by integrally combining a plurality of steel hollow tubes. The frame 11 includes a head pipe 21 disposed at an upper portion of a front end, an upper down frame 22 that extends downward from the center of the head pipe 21 to incline downward, and a frame 11 that is disposed below the head pipe 21 and inclines downward. The extended lower down frame 23, the pair of left and right lower frames 24, the pair of left and right upper frames 25, the pivot shaft 26, the upper bridge frame 27, the lower bridge frame 28, the guard frame 29, and the mounted device protection frame 30 And

  The head pipe 21 supports the steering mechanism 7 so as to be steerable, that is, swingably in the left-right direction of the vehicle.

  A pair of left and right lower frames 24 are disposed on the left and right of the lower down frame 23 and connected to a lower portion of the head pipe 21. Further, a pair of left and right lower frames 24 are substantially parallel to the lower down frame 23 from the connection portion with the head pipe 21 and extend downward and incline rearward, and rearward at the lower end of the inclined portion. A curved portion on the front side, which is bent in a straight line, and a straight portion extending substantially straight from the rear end of the curved portion on the front side to the rear of the vehicle body 5 until reaching the central portion of the vehicle body 5 (the central portion in the longitudinal direction of the vehicle). And Further, a pair of left and right lower frames 24 includes a rear curved portion that curves rearward and upward from the rear end of the straight portion, and a rear side that extends upward from the upper end of the rear curved portion and inclines upward. And an upper and lower frame joining portion connected to the upper frame 25 via the inclined portion. The interval between the left and right lower frames 24 is wider than the interval between the upper frames 25.

  Each of the lower frames 24 on the left and right sides is provided with a footrest bracket 31a that supports a footboard 31 on which a rider places his / her feet from below, outside the curved portion on the front side.

  The lower frame 24 disposed on the left side of the vehicle body 5 includes a side stand bracket (not shown). The side stand bracket (not shown) is provided with a side stand (not shown) that allows the electric motorcycle 1 to stand on its own in a state of being tilted to the left. The side stand 32 swings between a standing position at which the electric motorcycle 1 stands alone and a storage position along the vehicle body 5 so as not to hinder traveling.

  The pair of left and right upper frames 25 are connected to the vertical center of the front inclined portion of the lower frame 24 in the front half of the vehicle body 5. The pair of left and right upper frames 25 are a horizontal portion that extends substantially horizontally toward the rear of the vehicle body 5 from a connection portion with the front inclined portion of the lower frame 24 and a rear end of the horizontal portion of the pair of left and right upper frames 25. The rear end of the rear half of the vehicle body 5 and the upper part of the rear wheel 8, which is greatly inclined upward and rearward, curves inward in the left-right direction of the vehicle body 5 and approaches the thickness (width dimension) of the rear wheel 8. And

  The pivot shaft 26 is provided between the left and right upper frames 25 in the rear half of the vehicle body 5. Further, the pivot shaft 26 is located below the upper frame 25 and behind the junction (upper / lower frame joining portion) of the upper frame 25 and the lower frame 24, and is connected to the horizontal portion of the upper frame 25 and the lower frame 24. It is arranged on a bracket 26a connected to the rear inclined portion.

  The upper bridge frames 27 are provided at the front ends of the left and right upper frames 25. The upper bridge frame 27 extends substantially linearly between the left and right upper frames 25 in the left-right direction of the vehicle, and connects the left and right upper frames 25.

  The lower bridge frame 28 is provided at the front bent portions of the left and right lower frames 24. The lower bridge frame 28 extends between the left and right lower frames 24 substantially linearly in the left-right direction of the vehicle, and connects the left and right lower frames 24.

  The guard frames 29 are provided on the rear curved portions of the left and right lower frames 24. The guard frame 29 extends rearward and downward from a connection portion with the left and right lower frames 24, and extends in a U-shape that is downwardly rearward so as to enlarge the internal space of the frame 11. The guard frame 29 is provided with a center stand 33 that makes the electric motorcycle 1 stand upright and self-standing. The center stand 33 swings between a standing position at which the electric motorcycle 1 stands alone and a storage position along the vehicle body 5 so as not to hinder traveling.

  The upper down frame 22 is provided between the head pipe 21 and the upper bridge frame 27.

  The lower down frame 23 is connected to the center portion of the vehicle in the left-right direction of the bridge frame 34 near the head pipe, which extends substantially linearly in the left-right direction of the vehicle between the upper portions of the left and right lower frames 24. And a lower end connected to the center of the lower bridge frame 28 in the left-right direction of the vehicle.

  The mounted device protection frame 30 is provided above the rear half of the upper frame 25. The mounted device protection frame 30 supports the fuel cell 2 on the vehicle body of the electric motorcycle 1. A part of the mounted device protection frame 30 can be attached to and detached from the upper frame 25.

  The seat 13 extends back and forth over the rear half of the frame 11. The seat 13 is of a tandem type, and integrally includes a front half 13a for seating a passenger and a rear half 13b for seating a passenger. The seat 13 has an inclined portion 13c between the front half 13a and the rear half 13b.

  Here, a space surrounded by the left and right upper frames 25 and the left and right lower frames 24 is called a center tunnel region 35, and a space surrounded by the rear half of the upper frame 25, the exterior 12 and the seat 13 is called a device mounting region 36, The space behind the center tunnel area 35 and below the equipment mounting area 36 is called a tire house area 37.

  The center tunnel area 35 houses the fuel tank 15. In the scooter-type electric motorcycle 1 according to the present embodiment, the center tunnel region 35 is disposed along the front-rear direction of the vehicle between the left and right footboards 31 on which the rider puts his / her feet. It protrudes upward from the footboard 31 so as to divide the region left and right. In other words, a foot board 31 serving as a foot rest area is arranged on the left and right of the center tunnel area 35, and the fuel tank 15 is arranged between the left and right foot boards 31.

  The device mounting area 36 houses the secondary battery 16, the power management device 17, and the fuel cell 2 in order from the front side of the vehicle body 5. The device mounting area 36 is protected by the mounted device protection frame 30 at the front end, the center, the rear end, and the sides extending from the center to the rear end.

  The mounted device protection frame 30 protects the devices mounted in the device mounted region 36 around the device mounted region 36. The mounted equipment protection frame 30 is disposed at the front end of the equipment mounting area 36 and is erected between the left and right upper frames 25 in an upwardly convex arch shape. A central protection frame 30b that is disposed behind the junction of the upper frame 25 and the lower frame 24 and that extends between the left and right upper frames 25 in an upwardly projecting arch shape; And a pair of left and right rear protection frames 30c, which are arranged at the rear end and are connected to a portion where the left and right upper frames 25 curve inward and extend diagonally upward from the curved portion. A pair of left and right side protection frames 30 d extending rearward and connected to the upper end of the rear protection frame 30 c and further reaching the rear end of the vehicle body 5; A bracket 30e that spans between the rear edges of the protection frame 30d, and a. The left and right upper frames 25 are bent at the location where the lower end of the front protection frame 30a is joined to increase the space toward the rear of the vehicle, and are bent at the location where the lower end of the central protection frame 30b is joined and are located behind the vehicle. Extends to. For this reason, the center protection frame 30b is wider and higher than the front protection frame 30a. The rear protection frame 30c and the pair of left and right side protection frames 30d are integrated. The rear protection frame 30c and the pair of left and right side protection frames 30d are detachably connected to the center protection frame 30b and the upper frame 25, and support the fuel cell 2.

  The rear wheel 8 is arranged in the tire house area 37.

  A rear fender 38 is provided between the device mounting area 36 and the tire house area 37 as a partition member that divides each area.

  The exterior 12 includes a front leg shield cover 41 that covers the front half of the vehicle body 5, a front frame cover 42 that is arranged at the upper center of the vehicle body 5 and covers the upper part of the upper frame 25 such as the center tunnel region 35, and a rear half of the vehicle body 5. And a frame cover 43 that is disposed on the side and covers a lower portion of the seat 13 on the side surface of the vehicle body 5 such as the device mounting area 36.

  The frame cover 43 surrounds the device mounting area 36 together with the seat 13. The device mounting area 36 is a closed space surrounded by the seat 13, the frame cover 43, and the rear fender 38. The equipment mounting area 36 easily and reliably controls the flow of air to the fuel cell 2 by a ventilation hole (not shown) provided at an appropriate position of the frame cover 43 or the rear fender 38, and requires cooling. The flow of air as cooling air to the equipment is controlled easily and reliably. The device mounting area 36 allows air to enter from a joint between the covers and the like.

  The steering mechanism 7 is disposed in front of the vehicle body 5 and swings left and right around the head pipe 21 of the frame 11 to enable the front wheels 6 to be steered. The steering mechanism 7 includes a handle 45 provided on the top, and a pair of left and right front forks 46 connecting the handle 45 and the front wheel 6 and slightly extending rearward and vertically. The left and right front forks 46 have a telescopic structure that is elastically stretchable. At the lower ends of the left and right front forks 46, axles (not shown) for rotatably supporting the front wheels 6 are provided. Above the front wheel 6, a front fender 47 is arranged. The front fender 47 is located between the left and right front forks 46 and is fixed to the front fork 46.

  The front wheel 6 is a driven wheel rotatable around an axle provided at the lower ends of the left and right front forks 46.

  The swing arm 9 swings up and down around a pivot shaft 26 as a rotation center extending to the left and right of the vehicle body 5. The swing arm 9 rotatably supports the rear wheel 8 between a pair of arm portions extending in the front-rear direction on the left and right sides of the vehicle body 5. A rear suspension 48 is provided between the frame 11 and the swing arm 9. The upper end of the rear suspension 48 is swingably supported by the rear end of the upper frame 25. The lower end of the rear suspension 48 is swingably attached to the rear end of the swing arm 9. The rear suspension 48 buffers the swing of the swing arm 9.

  The swing arm 9 houses the motor 3 for driving the rear wheel 8 to rotate, and an inverter 18 for converting DC power supplied from the fuel cell 2 into AC power and supplying the AC power to the motor 3.

  The motor 3 drives the rear wheel 8 to rotate by electric power supplied from the fuel cell 2 or the secondary battery 16. The motor 3 is housed in the rear part of the swing arm 9 and is arranged coaxially with the axle of the rear wheel 8. The motor 3 is integrated with the swing arm 9 to form a unit swing type swing arm.

  The inverter 18 is housed in the front of the swing arm 9 and is arranged between the pivot shaft 26 and the motor 3.

  The rear wheel 8 is a driving wheel supported by an axle (not shown) to which a driving force is transmitted from the motor 3.

  The fuel cell 2 generates power by reacting a fuel with an oxidant. The fuel cell 2 is an air-cooled fuel cell system that uses high-pressure gas, for example, hydrogen gas as fuel, generates power using oxygen in air as an oxidant, and cools using air.

  The fuel cell 2 is arranged on the rear half side of the device mounting area 36. More specifically, the fuel cell 2 is arranged from the inclined portion between the front half 13a and the rear half 13b of the seat 13 to below the rear half 13b. That is, in a side view of the vehicle, the fuel cell 2 is disposed between the rear half portion 13b of the seat 13 on which the passenger sits and the rear wheel 8 or the swing arm 9.

  The fuel cell 2 has a rectangular parallelepiped shape having a long side extending in the front-rear direction of the vehicle body 5. The front face where the intake port 2 a is arranged is directed obliquely forward and downward, and the back face where the exhaust port 2 b is arranged is obliquely upward and rearward. It is arranged in the device mounting area 36 in a posture for pointing. That is, the fuel cell 2 is fixed to the frame 11 in a forwardly inclined posture in which the front side is located lower than the rear side. Specifically, the upper part of the fuel cell 2 is fixed to the mounted device protection frame 30, and the lower part of the fuel cell 2 is fixed to the upper frame 25.

  The fuel cell 2 includes a plurality of flat modules connected from the front side to the back side. Specifically, the fuel cell 2 includes a filter (not shown), an intake shutter (not shown), a fuel cell stack (not shown), a fan (not shown), It has an exhaust shutter (not shown). A fuel cell controller (not shown) is provided on the top surface of the fuel cell 2.

  The intake shutter has an intake port 2a for air that can be opened and closed. The intake shutter can open and close the intake port 2a to control the amount of air introduced into the fuel cell stack. Can form a circulation path for circulating air. The exhaust shutter has an openable and closable air exhaust port 2b, and can form a circulation path for circulating air in the fuel cell 2 by closing the exhaust port 2b. In other words, the fuel cell 2 has an openable and closable intake port 2a on the front and an openable and closable exhaust port 2b on the back. By closing the intake port 2a and the exhaust port 2b, the air in the fuel cell 2 is released. Can be circulated.

  The fuel cell stack generates electricity by causing an electrochemical reaction between oxygen contained in the air sucked from the intake port and hydrogen supplied from the fuel tank 15, and generates a wet surplus gas after the power generation.

  The fan generates a suction negative pressure for sucking the air in the device mounting area 36 into the fuel cell 2 from the intake port, while sucking excess gas from the fuel cell stack and exhausting it from the exhaust port. The air flow caused by the fan is used for cooling the fuel cell 2 in addition to being used for power generation in the fuel cell stack.

  An exhaust duct 52 is provided behind the fuel cell 2. The fan of the fuel cell 2 sucks out excess gas from the fuel cell stack and exhausts it to the exhaust duct 52. The front end of the exhaust duct 52 is airtightly connected to a box of the fuel cell 2 (specifically, a frame of the exhaust shutter). The exhaust duct 52 has an exhaust port 52a that is opened rearward and downward at the rear end of the vehicle body 5. The exhaust duct 52 guides exhaust gas (excess gas) discharged from the fan of the fuel cell 2 to the exhaust port 52a and discharges the exhaust gas to the rear of the vehicle body 5.

  The exhaust port 52 a of the exhaust duct 52 is located above the exhaust surface (rear surface) of the fuel cell 2, and is preferably arranged at the rear upper end of the exhaust duct 52. Specifically, the upper edge of the exhaust port 52a is disposed at a position higher than the exhaust port of the fuel cell 2. The exhaust duct 52 has an exhaust port 52a disposed above the exhaust surface (rear surface) of the fuel cell 2, and guides a wet surplus gas including unreacted hydrogen gas to the exhaust port 52a to cause the exhaust duct 52 to extend from the vehicle body 5. Exhaust can be reliably performed.

  The fuel tank 15 is a high-pressure compressed hydrogen storage system. The fuel tank 15 includes a pressure vessel 55 made of carbon fiber reinforced plastic (CFRP) or a composite vessel made of an aluminum liner, a fuel filling joint 57 having a fuel filling port 56, a fuel filling source valve 58, and a shutoff valve. (Not shown) and a fuel supply valve 59 integrally having a regulator (not shown).

  The pressure vessel 55 is an aluminum liner composite vessel that stores hydrogen gas as fuel for the fuel cell 2. The fuel tank 15 stores, for example, about 70 MPa of hydrogen gas. The pressure vessel 55 has a cylindrical body, and dome-shaped end plates on front and rear end surfaces of the body. The pressure vessel 55 is disposed in the center tunnel region 35 with the center line of the cylindrical body extending in the front-rear direction of the vehicle body 5. The pressure vessel 55 is surrounded by a pair of upper frames 25, a pair of lower frames 24, a lower bridge frame 28, and a guard frame 29, and is firmly protected against a load due to a fall or collision of the electric motorcycle 1. I have.

  The pressure vessel 55 includes an upper frame 25 disposed on one side of the vehicle body 5, for example, an upper frame 25 disposed on the right side of the vehicle body 5 and a lower frame disposed on the other side of the vehicle body 5. The frame 24 is supported in the center tunnel region 35 by a clamp band 61 provided between the frame 24 and the lower frame 24 disposed on the left side of the vehicle body 5. More specifically, the pressure vessel 55 is placed on a lower clamp band (lower half of the clamp band 61) provided between the upper frame 25 on the right side and the lower frame 24 on the left side. 61 (upper half). The clamp band 61 may be provided between the upper frame 25 disposed on the left side of the vehicle body 5 and the lower frame 24 disposed on the right side of the vehicle body 5.

  The fuel filling joint 57 is disposed outside the center tunnel region 35, specifically, above the rear and at the front end of the device mounting region 36. The fuel filling joint 57 is disposed above or directly above the secondary battery 16. The fuel filling joint 57 is fixed to a joint bracket 30f provided between the upper part of the front protection frame 30a of the mounted equipment protection frame 30 and the upper part of the central protection frame 30b. The fuel filling joint 57 extends upward and slightly to the left of the vehicle body 5 so that the joint on the equipment side can be inserted from above and to the left of the vehicle body during fuel filling. The fuel filling joint 57 is covered and hidden by a fuel filling port lid 62 provided at the front end of the seat 13. The fuel filler lid 62 is supported by the seat 13 via a hinge mechanism (not shown), and can be opened and closed by swinging. The fuel filling joint 57 has a fuel filling port 56 as an inlet for introducing a high-pressure gas of hydrogen as fuel into the fuel tank 15.

  The fuel filling port 56 is arranged at the top of the fuel filling joint 57. The fuel filling port 56 faces the upper left of the vehicle body 5. When the fuel tank 15 is filled with fuel, the upper portion of the fuel filling port 56 is open to the atmosphere with the fuel filling port lid 62 opened. Therefore, when filling the fuel tank 15 with the high-pressure gas (fuel, hydrogen gas), even if the high-pressure gas (fuel, hydrogen gas) leaks, the leaked fuel diffuses upward of the electric motorcycle 1 without stagnation.

  The fuel supply valve 58 and the fuel supply valve 59 are integrated and incorporated in a tank valve 63 provided on the top of the head plate on the rear side of the pressure vessel 55. The shutoff valve of the fuel supply valve 59 is an on-off valve using an electromagnetic valve. The tank valve 63 is disposed in a space surrounded by the guard frame 29.

  The secondary battery 16 is a box-shaped lithium ion battery. The secondary battery 16 is disposed at the front end of the device mounting area 36 and is disposed between the rear half of the pressure vessel 55, that is, the rear half of the cylindrical body, and the rear plate and the front half 13a of the seat 13. I have.

  In addition, the electric motorcycle 1 includes a second secondary battery (not shown) that supplies, for example, 12-V power as a power source for meters (not shown) and lamps (not shown) in addition to the secondary battery 16. It has. The second secondary battery is arranged around the head pipe 21, for example, on the right side of the head pipe 21.

  Even if hydrogen gas as fuel leaks from the fuel filling port 56, hydrogen gas lighter than air rises and diffuses outside the vehicle without staying in the vehicle. Even if hydrogen gas as fuel leaks from the fuel supply valve 58 or the fuel supply valve 59, the hydrogen gas moves toward the tire house area 37 and diffuses outside the vehicle without staying in the vehicle. .

  The power management device 17 is arranged between the secondary battery 16 and the fuel cell 2 in the device mounting area 36 and is fixed to the frame 11. Note that the power management device 17 may be arranged in the same waterproof case as the secondary battery 16.

  In the electric motorcycle 1, by arranging the secondary battery 16, the power management device 17, and the fuel cell 2 as described above, it is possible to arrange devices whose electrical connection relationship is adjacent to each other as close as possible. In addition, the wiring length between the devices can be shortened, and the weight related to the wiring can be reduced.

  The vehicle controller 19 is provided around the head pipe 21 at a relatively high place in the electric motorcycle 1, for example, on the left side of the head pipe 21 corresponding to the opposite side of the second secondary battery that supplies 12 V power. Are located.

  Next, the swing arm 9 of the electric motorcycle 1 will be described in detail.

  FIG. 4 is a perspective view of a swing arm of the electric motorcycle according to the embodiment of the present invention.

  FIG. 5 is a left side view of the swing arm of the electric motorcycle according to the embodiment of the present invention.

  As shown in FIGS. 4 and 5, the swing arm 9 of the electric motorcycle 1 according to the present embodiment includes a hollow swing arm body 65 that supports the rear wheel 8 in a cantilever manner, and is housed in the swing arm body 65. And a speed reducer 67 that reduces the rotational drive force of the motor 3 and transmits the reduced drive force to the rear wheels 8. Drive unit 66 includes inverter 18 and motor 3.

  The swing arm body 65 includes a pivot portion 68 supported by the pivot shaft 26 of the vehicle body 5, and a drive unit housing portion 69 extending rearward from a side of the pivot portion 68, here, from the left side to reach the left side of the rear wheel 8. And

  The pivot portion 68 extends to the full width inside the frame 11. In a side view, the pivot portion 68 is a triangular box that extends downward with the pipe 71 on which the pivot shaft 26 is disposed as a vertex, and has weight reduction ports at the top, bottom, left, and right.

  The drive unit housing 69 includes an inner case half 72 integrated with the pivot portion 68 and an outer case half 73 closing the inner case half 72. The inner case half 72 and the outer case half 73 are combined by a dividing surface extending in the front-back direction. FIG. 5 shows a state in which the outer case half 73 has been removed.

  The inner case half 72 has an inner side surface 75 (wall surface) facing the side surface of the rear wheel 8 and defines a space that opens to the left side of the vehicle.

  The outer case half 73 serves as a lid that closes the inner case half 72 from the left side of the vehicle.

  The drive unit housing 69 may be disposed on the right side of the vehicle. In this case, the arrangement of the inner case half 72 and the outer case half 73 is reversed left and right, and the relationship with the rear wheel 8 is also left and right. To reverse.

  A motor chamber 76 for housing the motor 3 is defined at the rear end of the drive unit housing 69. An inverter room 77 is defined on the front side of the motor room 76, that is, on the side closer to the pivot portion 68 than the motor room 76. The motor chamber 76 and the inverter chamber 77 are closed by the inner case half 72 and the outer case half 73 to restrict the inflow of outside air. Of the inner surface of the inverter chamber 77, the back surface 78 of the inner side surface 75 of the inner case half 72 is flat, and is the installation surface of the inverter 18. Radiation grease (not shown) is buried between the flat back surface 78 and the inverter 18, and a thermal connection between the inverter 18 and the swing arm body 65 is achieved.

  The swing arm body 65 is provided on an inner side surface 75 (wall surface) facing the side surface of the rear wheel 8 and has a plurality of arc-shaped heat radiation fins 81 concentric with the rear wheel 8.

  Each of the radiation fins 81 is a circular arc whose radius is substantially equal to the distance from the rotation center of the rear wheel 8 and is arranged on the inner side surface 75 at substantially equal intervals. The radiation fins 81 project from the inner side surface 75 toward the side surface of the rear wheel 8.

  The plurality of radiating fins 81 extend continuously to at least one of the top surface and the bottom surface of the swing arm body 65.

  The plurality of heat dissipating fins 81 include those having different projection heights according to the shape of the rear wheel 8. Specifically, the size of the heat radiation fins 81 is made substantially constant while leaving a space that does not interfere with the rear wheel 8. The protrusion height differs according to the shape of the rear wheel 8.

  Further, the swing arm 9 is provided on at least one of the top surface and the bottom surface of the swing arm body 65, and includes a wind guide rib 82 that connects ends of adjacent heat radiation fins 81. FIG. 4 shows a mode in which the radiation fins 81 are extended on both the top surface and the bottom surface, and the wind guide ribs 82 are provided on both the top surface and the bottom surface.

  The air guide ribs 82 project at the same height as the heat radiation fins 81 and separate the ends of the space between the heat radiation fins 81.

  Further, the swing arm 9 is provided with a boss 83 which is arranged so as to overlap with the radiation fin 81 and to which a fastening member (not shown) for fixing the inverter 18 to the swing arm body 65 is tightened.

  The inverter 18 is in contact with the back surface 78 of the inner side surface 75 of the inner case half 72. In the inverter 18, the portion overlapping the rear wheel 8 is larger when viewed in the rotation axis direction of the rear wheel 8. In other words, most of the inverter 18 overlaps in the side projection area of the rear wheel 8.

  The speed reducer 67 is provided on the inner side surface of the motor chamber 76. The speed reducer 67 includes a rear wheel axle (not shown) as an output shaft. The rear wheel 8 is fixed to a rear wheel axle.

  The rear wheel 8 is disposed behind the pivot portion 68 of the swing arm body 65 and on the right side of the drive unit housing portion 69 and on the center line of the vehicle. In a side view of the vehicle, the drive unit housing portion 69 of the swing arm body 65 overlaps a part of the left side surface of the rear wheel 8, and the entire motor 3 and most of the inverter 18 are arranged in the overlap portion. I have.

  Further, the swing arm 9 includes a plurality of radiating fins 86 on the bottom surface 85 of the inner case half 72 in addition to the radiating fins 81 on the inner side surface 75 of the inner case half 72.

  The plurality of radiating fins 86 are provided over the entire bottom surface 85 of the inner case half 72, that is, over the entire bottom surface of the motor chamber 76 from the inverter chamber 77. The plurality of radiation fins 86 extend in the front-rear direction of the vehicle, that is, in the longitudinal direction of the drive unit housing portion 69, and are aligned in the left-right direction of the vehicle, that is, in the width direction of the drive unit housing portion 69. Further, the plurality of radiation fins 86 protrude downward.

  The radiation fins 86 are provided integrally with the swing arm body 65, specifically, the inner case half 72.

  Next, the drainage structure of the electric motorcycle 1 will be described in detail.

  FIG. 6 is a perspective view of the drainage structure of the electric motorcycle according to the embodiment of the present invention, and is an enlarged view near the breather cap.

  7 and 8 are perspective views of the drainage structure of the electric motorcycle according to the embodiment of the present invention, and are enlarged views near the drain hole.

  As shown in FIGS. 6 to 8 in addition to FIG. 5, the drainage structure 91 according to the present embodiment includes a hollow swing arm body 65 supporting the rear wheel 8 and an inverter housed in the swing arm body 65. 18, a motor 3 housed in the swing arm body 65 and rotating the rear wheel 8 with electric power supplied from the inverter 18, and a pressure difference between the inside and outside of the swing arm body 65 provided above the swing arm body 65. A breather cap 92 for balancing, a drain 95 provided at a lower portion of the swing arm body 65 and having a drain hole 93 for discharging moisture from the swing arm body 65, and a drain plug 96 detachably attached to the drain 95. And

  The motor 3 is arranged at the rear end of the swing arm body 65. The inverter 18 is arranged on the front side of the motor 3. That is, the motor 3 and the inverter 18 are housed in the swing arm body 65 extending in the front-rear direction of the vehicle on the left side of the rear wheel 8 in the order of the inverter 18 and the motor 3 from the front of the vehicle.

  The swing arm body 65 has a motor room 76 in which the motor 3 is arranged and an inverter room 77 in which the inverter 18 is arranged. Between the motor room 76 and the inverter room 77, a partition wall 97 is formed integrally with the inner case half 72 to protrude so as to partition the motor room 76 and the inverter room 77. The partition wall 97 extends in an arc shape along the circular motor chamber 76 when viewed from the side of the vehicle, and protrudes into the swing arm body 65 from the side wall of the outer wall 98 of the inner case half 72 (the vertical wall on the rear wheel 8 side). At the same time, the upper and lower ends thereof are connected to the upper surface (upper wall) of the outer wall 98 and the bottom surface (bottom wall) of the outer wall 98, and surround the motor 3 as a whole. The partition wall 97 does not completely isolate the motor room 76 and the inverter room 77 but has a gap through which a power line 99 for supplying electric power from the inverter 18 to the motor 3 passes. This gap is formed between the inner case half 72 and the outer case half 73. Further, as shown in FIG. 5, the gap extends from a connection portion with the upper surface (upper wall) of the outer wall 98 to a connection portion with the bottom surface (bottom wall) of the outer wall 98.

  A ventilation hole 101 communicating with the breather cap 92 is formed near the upper end of the partition wall 97 and on the upper surface of the outer wall 98 of the inner case half 72 that partitions the inverter chamber 77. That is, the outer wall 98 of the inner case half 72 has the ventilation hole 101 near the upper end of the partition wall 97 and on the inverter chamber 77 side. In detail, the ventilation hole 101 is provided on the upper surface of the outer wall 98 of the inverter room 77 located forward of the upper end of the partition wall 97 in the front-rear direction of the vehicle. More specifically, the vent hole 101 is opened in a corner space surrounded by the partition wall 97 and the upper surface of the outer wall 98 which are located behind the inverter 18 in the front-rear direction of the vehicle and behind the inverter 18 and turn around to the motor room 76 side. ing.

  Near the lower end of the partition wall 97, the bottom surface of the outer wall 98 of the inner case half 72 that partitions the inverter chamber 77 follows the inclination of the swing arm body 65, which is inclined obliquely downward and downward from the pivot shaft 26 to the axle of the rear wheel 8. As described above, the inner wall surface 103 tilts obliquely downward and rearward, and the inner wall surface 102 tilts obliquely upward and rearward against the tilt of the swing arm body 65 on the rear side of the inner wall surface 103. The bottom surface of the inner case half 72 has a valley portion 105 that is the lowermost portion of the inner wall surface 102 and the inner wall surface 103 at a portion adjacent to the inner wall surface 102 that tilts obliquely rearward and upward and the inner wall surface 103 that tilts rearward and downward. I have. Further, at the rear end of the inner wall surface 102, a boss having a screw hole for connecting the inner case half 72 and the outer case half 73 bulges into the swing arm body 65. This boss is arranged between the motor room 76 and the inverter room 77. The lower end of the partition wall 97 is connected to this boss. The shape of the boss and the end of the partition wall 97 project upward from the inner wall surface 102. The bottom surface of the outer case half 73 also has an inclined inner wall surface and a boss.

  A drain hole 93 connected to the drain 95 is formed in the inner wall surface 102 inclined obliquely upward and rearward of the inner case half 72. That is, the outer wall 98 of the inner case half 72 has a drain hole 93 near the lower end of the partition wall 97 and on the inverter chamber 77 side. The drain hole 93 is provided between the valley 105 and the boss in the front-rear direction of the vehicle.

  The breather cap 92 is connected to a vent hole 101 provided on the upper surface (upper wall) of an outer wall 98 between the motor 3 and the inverter 18 in the front-rear direction of the vehicle. The breather cap 92 prevents the intrusion of moisture and dust while ventilating the inside and outside of the drive unit housing 69. The breather cap 92 has a built-in fibrous film that allows the passage of air while preventing the passage of water droplets and dust.

  By the way, since the air passing through the breather cap 92 and the air existing in the swing arm body 65 mainly contain moisture, when the motor 3 and the inverter 18 are stopped and become cold, the air is stored in the drive unit housing 69. Condensed water is generated due to condensation. Therefore, the drainage structure 91 according to the present embodiment includes the drain 95.

  Drain 95 is arranged between motor 3 and inverter 18. More specifically, the drain 95 is disposed adjacent to the valley portion 105 behind the valley portion 105 of the inner wall surface 102 inclined obliquely upward and rearward of the inner case half 72 and the inner wall surface 103 inclined obliquely downward and rearward. . In particular, the drainage hole 93 is disposed on the inner wall surface 102 inclined obliquely upward and rearward, and is opened obliquely toward the bottom of the valley 105.

  The drain 95 extends obliquely downward and rearward of the vehicle outside the inner case half 72. In other words, the drain 95 forms an acute angle on the front and rear sides of the vehicle with the inner wall surface 102 inclined obliquely upward and rearward, and forms an obtuse angle on the upper and lower sides. The drain hole 93 extends obliquely downward and rearward of the vehicle inside the drain 95, similarly to the drain 95.

  The condensed water generated in the drive unit housing portion 69 drips down due to gravity and collects in a valley portion 105 of an inner wall surface 102 inclined obliquely upward and rearward and an inner wall surface 103 inclined obliquely downward and rearward of the inner case half 72. Further, a part of the condensed water flows to the inner wall surface 102 through the partition wall 97 whose upper end is arranged near the breather cap 92 and whose lower end is arranged near the rear end of the inner wall surface 102. Since the drain hole 93 is adjacent to the valley portion 105, the water (condensed water) dripped and collected in the valley portion 105 is collected from the drain hole 93 to the drain plug 96.

  Note that the opening edge of the drain hole 93 of the drain 95 may be in contact with the bottom of the valley portion 105, or the inner wall surface 103 (the inner wall surface) which extends across the valley portion 105 and is inclined obliquely downward behind the inner case half 72. It may intrude into the surface adjacent to the front of the surface 102). Further, the entire periphery of the opening edge of the drainage hole 93 of the drain 95 may be disposed on the inner wall surface 102 inclined obliquely upward and behind the inner case half 72 without being hung on the valley 105. In any case, the condensed water that collects in the valley portion 105 inertia moves from the valley portion 105 side to the motor chamber 76 side with the acceleration of the electric motorcycle 1 and flows into the drainage hole 93 from inside the swing arm body 65, It collects in the drain plug 96. The condensed water that has moved to the rear side of the vehicle after passing through the opening of the drain hole 93 due to the inertial movement accompanying the acceleration of the vehicle is provided at the rear end of the inner wall surface 102, A part of the boss 65 is blocked by the boss that appears, and the flow into the motor chamber 76 is suppressed. When the acceleration is completed, the water flows back to the valley 105 and a part of the water flows into the drain hole 93.

  The drain plug 96 is a cap that covers the outlet end of the drain 95, that is, the end of the pipe that is press-fitted and fixed to the drain hole 93 and protrudes outside the inner case half 72. The drain plug 96 is on an extension of the drain 95 and extends obliquely downward and rearward.

  It is preferable to apply a transparent and soft resin to the material of the drain plug 96. The drainage structure 91 including the transparent drain plug 96 can easily confirm the presence or absence of condensed water discharged from the drainage hole 93 of the drain 95. Further, the drainage structure 91 including the drain plug 96 made of a soft resin makes it easy to attach and detach the drain plug 96, and can easily discard the condensed water stored in the drain plug 96.

  The drain plug 96 is located above the lowermost end of the swing arm body 65 (the lower end of the motor chamber 76). The drain plug 96 is always above the lowermost end of the swing arm body 65 in the entire swing range of the swing arm body 65.

  Further, the drain plug 96 is sandwiched between a plurality of radiating fins 86 provided on the bottom surface of the swing arm body 65. The radiation fin 86 has an amount of protrusion that follows the shapes of the drain 95 and the drain plug 96. Specifically, near the roots of the drain 95 and the drain plug 96, the radiation fins 86 reinforce the drain 95 connected to the drain 95 and protruding from the lower surface. The protrusion of the radiation fin 86 near the drain 95 is suppressed in consideration of avoiding interference with the drain plug 96 and taking into consideration the detachability of the drain plug 96. Further, near the drain 95 and the drain plug 96, the heat radiation fins 86 protrude so as to overlap the side projection area of the drain 95 and the drain plug 96. That is, the radiation fins 86 cover and substantially cover the entire drain 95 in a side view of the vehicle.

  The entire drain plug 96 may be sandwiched between the radiation fins 86, or a part of the drain plug 96 may be sandwiched between the radiation fins 86. When the whole is sandwiched, the drain plug 96 is excellently protected, and it is possible to prevent the drain plug 96 from dropping off by contact with, for example, a curb of a road. On the other hand, when part of the drain plug 96 is partially exposed, the drain plug 96 is excellent in protection and detachability, and the condensed water can be easily discarded.

  The drainage structure 91 of the swing arm 9 according to the present embodiment takes the air permeability inside and outside the drive unit accommodating portion 69 with the breather cap 92 to reduce the fluctuation of the internal pressure due to the temperature change due to the operation and stoppage of the motor 3 and the inverter 18. ease.

  Further, the drainage structure 91 of the swing arm 9 according to the present embodiment secures air permeability through the breather cap 92, while preventing water droplets and dust from entering the drive unit housing 69.

  Furthermore, the drainage structure 91 of the swing arm 9 according to the present embodiment reduces the amount of water remaining in the drive unit housing 69 by discharging condensed water generated in the drive unit housing 69 to the drain plug 96. Then, the condensed water is repeatedly vaporized and liquefied by the operation and stoppage of the motor 3 and the inverter 18, thereby preventing an increase in the amount of water in the drive unit housing 69.

  Furthermore, the drainage structure 91 of the swing arm 9 according to the present embodiment stores the condensed water generated in the drive unit housing 69 in the drain plug 96, so that additional water or water is drained from the drainage hole 93 of the drain 95. Dust can be prevented from entering.

  In addition, the drainage structure 91 of the swing arm 9 according to the present embodiment has a structure in which the drain 95 is disposed between the motor 3 and the inverter 18, whereby a swing generated between the generally circular motor 3 and the inverter 18 is formed. Condensed water is collected in the discontinuous portion of the shape of the outer wall 98 of the arm body 65, and is easily guided to the drain hole 93, so that the amount of water remaining in the drive unit housing 69 can be reduced.

  Furthermore, in the drainage structure 91 of the swing arm 9 according to the present embodiment, by arranging the drain plug 96 above the lowermost end of the swing arm body 65, the drain plug 96 comes into contact with a curb or the like and falls off. Can be prevented.

  Furthermore, the drainage structure 91 of the swing arm 9 according to the present embodiment is provided with the drain plug 96 that extends obliquely downward and rearward, thereby suppressing the downward projection height and has an excellent appearance.

  In addition, the drainage structure 91 of the swing arm 9 according to the present embodiment makes the drain plug 96 inconspicuous by arranging the drain plug 96 between the plurality of radiating fins 86, and adjusts the appearance. Protection and detachability can be improved.

  Therefore, according to the water drainage structure 91 of the electric motorcycle 1 according to the present invention, moisture and dust splashed during traveling can be reduced by the electric motors such as the motor 3 and the inverter 18 while ensuring the ventilation and drainage in the swing arm 9. Thus, it is possible to reliably prevent the intrusion into the space in the swing arm body 65 that houses the electronic device.

DESCRIPTION OF SYMBOLS 1 ... Electric motorcycle, 2 ... Fuel cell, 2a ... Intake port, 2b ... Exhaust port, 3 ... Motor, 5 ... Body, 6 ... Front wheel, 7 ... Steering mechanism, 8 ... Rear wheel, 9 ... Swing arm, 11 ... Frame , 12 ... exterior, 13 ... seat, 13 a ... front part, 13 b ... rear part, 15 ... fuel tank, 16 ... secondary battery, 17 ... power management device, 18 ... inverter, 19 ... vehicle controller, 21 ... head pipe, 22 upper down frame, 23 lower lower frame, 24 lower frame, 25 upper frame, 26 pivot shaft, 26a bracket, 27 upper bridge frame, 28 lower bridge frame, 29 guard frame, 30 Mounted device protection frame, 30a front protection frame, 30b center protection frame, 30c rear protection frame, 30d side protection frame, 3 e: Bracket, 30f: Bracket for joint, 31: Footboard, 31a: Footrest bracket, 33: Center stand, 34: Bridge frame near head pipe, 35: Center tunnel area, 36: Equipment mounting area, 37: Tire house area 38, rear fender, 41, front leg shield cover, 42, front frame cover, 43, frame cover, 45, handle, 46, front fork, 47, front fender, 48, rear suspension, 52, exhaust duct, 52a, exhaust Mouth, 55 ... Pressure container, 56 ... Fuel filling port, 57 ... Fuel filling joint, 58 ... Fuel filling source valve, 59 ... Fuel supply source valve, 61 ... Clamp band, 62 ... Food filling port lid, 63 ... Tank Valve, 65: swing arm body, 66: drive unit , 67 ... reducer, 68 ... pivot part, 69 ... drive unit housing part, 71 ... pipe, 72 ... inner case half, 73 ... outer case half, 75 ... inner side surface, 76 ... motor room, 77 ... Inverter room, 78 back surface, 81 radiation fins, 82 wind guide ribs, 83 boss, 85 bottom surface, 86 radiation fins, 91 drainage structure, 92 breather cap, 93 drain hole, 95 Drain, 96: drain plug, 97: partition, 98: outer wall, 99: power line, 101: vent hole, 102, 103: inner wall surface, 105: valley.

Claims (5)

A hollow swing arm body that supports the drive wheels,
An inverter housed in the swing arm body;
An electric motor that is housed in the swing arm body and rotationally drives the drive wheels with electric power supplied from the inverter;
A breather cap provided at an upper portion of the swing arm body to directly connect an inside of the swing arm body and an outside of the swing arm body to balance a pressure difference between the inside and outside of the swing arm body;
A drain provided at a lower portion of the swing arm body and having a drainage hole for discharging moisture in the swing arm body;
A drain plug detachably attached to the drain,
A drainage structure for an electric motorcycle , comprising: a plurality of radiating fins provided on a bottom surface of the swing arm body and sandwiching the drain plug . The electric motor is disposed at a rear end of the swing arm body,
The inverter is arranged on a front side of the electric motor,
The drainage structure for an electric motorcycle according to claim 1, wherein the drain is disposed between the electric motor and the inverter. The electric motor is disposed at a rear end of the swing arm body,
The inverter is arranged on a front side of the electric motor,
The drainage structure for an electric motorcycle according to claim 1 or 2, wherein the breather cap is disposed between the electric motor and the inverter. 4. The drain structure for an electric motorcycle according to claim 1, wherein the drain plug is located above a lowermost end of the swing arm body. 5. The drainage structure for an electric motorcycle according to any one of claims 1 to 4, wherein the drain plug extends rearward and obliquely downward.

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