JP2012101567A - Saddle-riding type electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a saddle-riding type electric vehicle for mounting a battery without enlarging a vehicle body, and capable of providing excellent cooling performance with a simple structure.SOLUTION: An electric two-wheeler includes a main frame 4 extending backward-obliquely downward from a head pipe 3 and a seat 13 arranged above a rear part of the main frame 4, and forms a straddling part S through which a rider straddles the main frame 4, above the main frame 4 between the seat 13 and the head pipe 3. An opening part 25 is formed in the main frame 4 for opening upward so as to face the straddling part S, and a battery unit 24 for supplying electric power to an electric motor 18, is detachably stored in the opening 25.

Description

  The present invention relates to a straddle-type electric vehicle.

  Recently, various technologies related to the saddle riding type electric vehicle have been proposed. For example, in Patent Document 1, an electric motor unit is mounted below a pair of left and right main frames extending rearward and downward from a head pipe, and a battery for driving the electric motor in a space between the main frame and the electric motor unit is provided. An electric motorcycle arranged and supported by a main frame is disclosed.

JP 2003-182669 A

  By the way, when it is the structure which supports a battery in a flame | frame like the vehicle disclosed by patent document 1, although the whole vehicle inevitably enlarges with the arrangement | positioning space of a battery, it is a comparatively small straddle-type electric vehicle. Therefore, it is required to install a battery without increasing the size of the vehicle body. In addition, although it is necessary to provide a cooling structure in consideration of the heat generated by the battery, it is desirable that such a cooling structure be configured simply without complicating the structure.

  In connection with the above requirements, it is conceivable to suppress the battery capacity in order to reduce the size of the vehicle body. However, since the cruising distance of the electric vehicle depends on the capacity of the battery, it is sufficient if the battery capacity is excessively suppressed. The cruising distance cannot be obtained, and on the other hand, the cruising distance can be extended as the battery capacity is increased. However, securing the battery capacity has a problem of increasing the size and weight of the vehicle body. In consideration of this point, it is further desired to ensure both the cruising distance, the enlargement of the vehicle body, and the suppression of the weight increase.

  The present invention has been made in view of such circumstances, and firstly, a straddle-type electric vehicle in which a battery is mounted without increasing the size of the vehicle body, and a good cooling performance can be obtained with a simple structure. The purpose is to provide. A second object of the present invention is to provide a straddle-type electric vehicle that can achieve both the extension of the cruising distance by securing the capacity of the battery, the enlargement of the vehicle body, and the suppression of the weight increase.

  As a means for solving the above problems, the invention according to claim 1 is characterized in that a main frame (4) extending rearward and obliquely downward from the head pipe (3) and a seat (13) disposed above the rear portion of the main frame (4). ) Between the seat (13) and the head pipe (3) and above the main frame (4), the driver straddles the main frame (4) (S) In the straddle-type electric vehicle in which an opening (25) is formed in the main frame (4) so as to face the straddle (S), the electric motor (18) serving as a drive source is formed. A straddle-type electric vehicle characterized in that a main battery (24) for supplying electric power is detachably accommodated in the opening (25).

  According to a second aspect of the present invention, in the saddle riding type electric vehicle according to the first aspect, the opening (25) is formed in a U-shaped cross section that opens upward, and the main battery (24) It is characterized by being accommodated in contact with the inner wall of the opening (25).

  According to a third aspect of the present invention, in the saddle riding type electric vehicle according to the second aspect, a cooling rib (26) is integrally provided on the main frame (4).

  According to a fourth aspect of the present invention, in the straddle-type electric vehicle according to any one of the first to third aspects, the main battery (24) is located above the opening (25). In addition to the main battery (24), an extra battery (41) for supplying electric power to the electric motor (18) can be detachably attached.

  According to a fifth aspect of the present invention, in the straddle-type electric vehicle according to the fourth aspect, the vehicle extends from the head pipe (3) to a rear portion of the main frame (4), and the main frame (4) is The vehicle body cover (32) is further provided, and the main battery (4) and the extra battery (41) are covered with the vehicle body cover (32), and the vehicle body cover (32) includes the main battery (24). And an intake port (40) for guiding traveling wind to the extra battery (41).

According to the first aspect of the present invention, since the main battery is accommodated in the frame, it is possible to suppress an increase in the size of the vehicle body, and the main battery is disposed at a position where it is easy to receive traveling wind. Cooling performance can be obtained.
According to the second aspect of the present invention, the main battery can be cooled by cooling the main frame with the traveling wind, so that the main battery can be effectively cooled.
According to the invention described in claim 3, the cooling effect of the main battery can be improved by increasing the heat dissipation of the main frame.
According to the fourth aspect of the present invention, it is possible to extend the cruising distance by enabling attachment of an extra battery capable of supplying electric power to the electric motor in addition to the main battery. In addition, by making it possible to attach an extra battery above the main battery housed in the main frame, the enlargement of the vehicle body due to the attachment of the extra battery can be suppressed as much as possible, and the extra battery is detachable. The weight increase can be avoided according to the passenger's choice.
According to the invention described in claim 5, the cooling structure for the main battery can be shared by the extra battery, and the cooling structure can be simplified.

1 is a left side view of an electric motorcycle according to an embodiment of the present invention. It is sectional drawing which follows the AA line of FIG. 1 is a block diagram showing a system configuration of an electric motorcycle.

  Hereinafter, each embodiment of the present invention will be described with reference to the drawings. In the drawings used below, the arrow FR indicates the front of the vehicle, and the arrow UP indicates the upper side of the vehicle.

  FIG. 1 shows a scooter type electric motorcycle 1 which is an example of a saddle riding type electric vehicle according to a first embodiment of the present invention. The electric motorcycle 1 includes a steel body frame 2 in which a plurality of frame members are integrally formed by welding or the like. The body frame 2 includes a head pipe 3, a main frame 4 extending rearward and downward from the head pipe 3, and a main frame 4. A pair of left and right rear frames 5 and 5 are provided which are welded to the rear end of the frame 4 and extend rearward and upward, and then extend substantially in the horizontal direction. The main frame 4 includes a down frame portion 6 that extends obliquely downward and rearward from the head pipe 3 and a floor frame portion 7 that extends rearward substantially horizontally from the rear end of the down frame portion 6. A pair of left and right pivot plates 8, 8 are welded to the lower portions of the rear frames 5, 5 so as to project rearward. A pair of left and right support frames 9 and 9 are welded and installed between the main frame 4 and the rear frames 5 and 5 in front of the pivot plates 8 and 8. Each of the frames is made of an aluminum alloy.

  A pair of left and right front forks 10, 10 are rotatably supported on the head pipe 3, and a front wheel 11 is rotatably supported on the lower portion of the front forks 10, 10. A steering handle 12 is fixed to the upper part of the front forks 10, 10, and various operating devices (not shown) such as an accelerator grip and a brake lever are disposed on the steering handle 12. A seat 13 on which an occupant sits is disposed behind the steering handle 12, and the seat 13 extends from the center in the longitudinal direction of the vehicle body to the vicinity of the rear portion of the rear wheel 14. Between the seat 13 and the head pipe 3 and above the main frame 4, a straddling portion (space) S is formed so that the driver straddles the main frame 4. The driver sits on the seat 13 across the straddling portion S. The rear wheel 14 is rotatably supported at the rear portion of the swing unit 15, and the swing unit 15 is supported by the pivot plates 8 and 8 via the pivot shaft 16, so that the pivot shaft 16 is centered on the axis. And is supported so as to be swingable in the vertical direction. A rear cushion 17 serving as a shock absorber is interposed between the rear portion of the swing unit 15 and the left rear frame 5.

  The swing unit 15 is configured by housing an electric motor 18 and a gear mechanism 19 in a unit case 20, and the unit case 20 further includes an ECU (Electrical Control Unit) 21 and a PDU (Power Drive Unit) 22 at the upper part thereof. The unitized control unit 23 is accommodated. The ECU 21 comprehensively executes various controls of the vehicle, and the PDU 22 controls the drive of the electric motor 18 in accordance with a command from the ECU 21. The gear mechanism 19 includes a starting clutch, a planetary gear, and the like, and the drive of the electric motor 18 is transmitted to the rear wheel 14 stepwise by the gear mechanism 19. The rear wheel 14 is fixed to a drive shaft (not shown) provided in the electric motor 18 and is driven to rotate. The electric motor 18 is supplied with electric power from the battery unit 24 via the PDU 22, and the battery unit 24 includes a plurality of lithium ion batteries 24 </ b> B in a long rectangular parallelepiped case 24 </ b> A made of a resin material. Each lithium ion battery is connected in series to form a high voltage battery.

  Referring to FIG. 2, the floor frame portion 7 of the main frame 4 is formed with a U-shaped opening 25 having a vertical cross section (vertical cross section) opened upward so as to face the straddling portion S, The battery unit 24 is detachably accommodated in the opening 25. Specifically, the opening 25 forms a long space in the front-rear direction, and the entire case 24 </ b> A of the battery unit 24 is accommodated in the floor frame portion 7. The case 24A is partially open, the lithium ion battery 24B is exposed to the outside of the case 24A, and the housing outer wall of the lithium ion battery 24B is in contact with the inner wall of the opening 25 in the accommodated state of the battery unit 24. It is in a state. A plurality of ribs 26 projecting downward are integrally formed at the bottom of the floor frame portion 7. As shown in FIG. 1, the ribs 26. A cross-sectional area is secured.

  As shown in FIG. 1, the battery unit 24 is electrically connected to the contactor 27 via the first harness 28, and the contactor 27 is fixed by a fastening portion (not shown) provided at the lower part of the left rear frame 5. ing. The contactor 27 is connected to the battery unit 24 via the first harness 28 and is electrically connected to the PDU 22 via the second harness 29 to supply power to the PDU 22. The contactor 27 is also connected to a later-described DC-DC converter 30 (FIG. 3). The DC-DC converter 30 steps down the voltage from the battery unit 24 and supplies power to the ECU 21 and the like. Although not shown in FIG. 1, the DC-DC converter 30 is provided at an appropriate position on the vehicle body. Further, the PDU 22 and the electric motor 18 are electrically connected by a third harness 31.

  The vehicle body cover 32 constituting the vehicle exterior of the electric motorcycle 1 is composed of a plurality of resin cover bodies. Specifically, the vehicle body cover 32 includes a handle cover 33 that projects the left and right end portions of the steering handle 12 to the outside and covers the center side of the steering handle 12, and extends downward from the handle cover 33 along the down frame portion 6. A leg shield 34 that extends from the front and covers the legs of the driver seated on the seat 13; a side cover 35 that extends rearward from the rear surface of the leg shield 34 to reach the lower side of the seat 13; 13 includes a pair of left and right rear side covers 36, 36 that are provided so that the front part of the side cover 35 can be overlapped from the side below 13 and extend in the front-rear direction and cover the rear frames 5, 5. Yes.

  The seat 13 is provided above the side cover 35 and the rear side covers 36, 36 so as to straddle them. The side cover 35 is provided with a seat hinge 37 that rotatably supports the seat 13. The front end of the seat 13 is supported by the seat hinge 37 and is opened from the rear. A rear fender 38 extends from between the rear portions of the rear side covers 36, 36, and a combination lamp 39 is supported on the rear fender 38. A pair of left and right inlets 40, 40 are formed in the leg shield 34 so as to open forward in the left and right front of the head pipe. The traveling wind introduced from the intake ports 40, 40 flows from the front to the rear (specifically, obliquely downward in the rear) in the vehicle body cover 32 and reaches the battery unit 24. Further, the side cover 35 covers both sides of the floor frame portion 7 and opens downward, and the floor frame portion 7 is exposed to the outside of the side cover 35. The traveling wind from below the side cover 35 directly hits the floor frame portion 7.

  In the present embodiment, an extra battery 41 that can supply electric power to the electric motor 18 separately from the battery unit 24 is detachable above the battery unit 24 and above the opening 25 that accommodates the battery unit 24. It can be attached to. As shown in FIGS. 1 and 2, the extra battery 41 includes a plurality of lithium ion batteries 41B in a long rectangular parallelepiped case 41A made of a resin material. It arrange | positions so that it may be mounted in the upper periphery of the opening 25 in the floor frame part 7. FIG. In the figure, reference numeral 42 denotes a stopper for restricting the movement of the extra battery 41 to the side. The stoppers 42 and 42 are provided so as to protrude upward from both side walls of the floor frame portion 7.

  As shown in FIG. 1, a connector 43 that is connected to the extra battery 41 is provided at the upper part of the floor frame portion 7 behind the extra battery 41, and the connector 43 is connected to the contactor 27 via a fourth harness 44. Yes. The power of the extra battery 41 can be supplied to the electric motor 18 via the contactor 27, the PDU 22 and the third harness 31. The extra battery 41 is attached to the floor frame portion 7 from above after removing the side cover 35. After the extra battery 41 is attached, the side cover 35 is attached again, and the extra battery 41 is attached to the side cover 35. Covered by.

  FIG. 3 shows the system configuration of the electric motorcycle 1. As shown in FIG. 3, in the electric motorcycle 1, the electric power from the battery unit 24 is supplied to the PDU 22 that is a motor driver via a contactor 27 that is linked to a main switch (not shown), and is converted from direct current to three-phase alternating current by the PDU 22. After that, the electric motor 18 which is a three-phase AC motor is supplied. Further, the output voltage from the battery unit 24 is stepped down via the DC-DC converter 30 and, for example, a general electric component (“etc” in the figure) such as a 12V sub-battery 46 and instruments, ECU 21, etc. Supplied to control system parts.

  The battery unit 24 is charged by a charger (CHG) 47 connected to, for example, an AC 100V power source. The BMU (Battery Management Unit) 48 monitors the charge / discharge status, temperature, and the like of the battery unit 24, and the information is shared with the ECU 21. The ECU 21 receives output request information from the accelerator sensor (ACL) 49, and the ECU 21 drives and controls the electric motor 18 via the PDU 22 based on the output request information. The charger 47 is provided at an appropriate position on the vehicle body, but it may be not mounted. Further, depending on the type of the battery unit 21, the sub battery 46 may be omitted. Further, the BMU 48 is disposed in the vicinity of the battery unit 24.

  Here, in the electric motorcycle 1 according to the present embodiment, the electric power from the extra battery 41 is further supplied to the PDU 22 which is a motor driver via the contactor 27, and after being converted from direct current to three-phase alternating current by the PDU 22, 3 The electric motor 18 which is a phase AC motor can be supplied. In addition, the output voltage from the extra battery 41 is stepped down via the DC-DC converter 30 and the general electric parts (“etc” in the figure) such as the sub-battery 46 and instruments, and the control system such as the ECU 21 It is also possible to supply parts. That is, the PDU 22 can supply power to the electric motor 18 from at least one of the battery unit 24 and the extra battery 41. In the electric motorcycle 1, an accelerator grip (not shown) is provided on the steering handle 12, and the accelerator opening of the accelerator grip is detected by the accelerator sensor 49 and output to the ECU 21. The ECU 21 controls the PDU 22 in accordance with the accelerator opening, and the rear wheel 14 is driven by the PDU 22 so that the electric motorcycle 1 travels.

  As described above, in the electric motorcycle 1 according to the embodiment of the present invention, the opening 25 that opens upward is formed on the floor frame portion 7 of the main frame 4 so as to face the straddling portion S. A battery unit 24 for supplying electric power is detachably accommodated in the opening 25. Thereby, in this electric motorcycle 1, since the battery unit 24 is accommodated in the frame, it is possible to suppress an increase in the size of the vehicle body, and the battery unit 24 is disposed at a position where it is easy to receive traveling wind. Cooling performance can be obtained.

  Further, the opening 25 is formed in a U-shaped cross section that opens upward, and the battery unit 24 is accommodated in contact with the inner wall of the opening 25, so that the battery unit 24 is cooled by the cooling of the main frame 4 by the traveling wind. The battery unit 24 can be effectively cooled. Further, the main frame 4 is integrally provided with cooling ribs 26... So that the heat dissipation of the main frame 4 can be improved and the cooling effect of the battery unit 24 can be improved.

  Further, in the electric motorcycle 1 according to the present embodiment, an extra battery 41 that supplies power to the electric motor 18 separately from the battery unit 24 can be detachably mounted above the battery unit 24 and above the opening 25. It is. According to this, the cruising distance can be extended, and the extra battery 41 can be attached above the battery unit 24 accommodated in the main frame 4, thereby increasing the size of the vehicle body as much as possible. Can be suppressed. Furthermore, since the extra battery 41 is detachable, an increase in weight can be avoided according to the occupant's selection.

  In addition, the electric motorcycle 1 further includes a vehicle body cover 32 that extends from the head pipe 3 to the rear portion of the main frame 4 and covers the main frame 4, and the battery unit 24 and the extra battery 41 are connected by the side cover 35 of the vehicle body cover 32. It is supposed to be covered. The leg shield 34 of the vehicle body cover 32 is formed with air inlets 40, 40 that can guide the traveling wind to the battery unit 24 and the extra battery 41. With this configuration, the cooling structure for the battery unit 24 is shared with the extra battery 41, and the cooling structure is simplified.

  Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. For example, in the above embodiment, the battery unit is configured to include a plurality of lithium ion batteries, but instead of this, a nickel hydrogen battery or a lead battery may be used.

1 Electric motorcycle (saddle-type electric vehicle)
3 Head pipe 4 Main frame 13 Seat 18 Electric motor 24 Battery unit (main battery)
25 Opening 26 Rib 32 Car body cover 40 Inlet 41 Extra battery S Crossing

Claims (5)

A main frame (4) extending rearward and obliquely downward from the head pipe (3); and a seat (13) disposed above the rear portion of the main frame (4), the seat (13) and the head pipe (3 In a straddle-type electric vehicle in which a straddle portion (S) is formed over the main frame (4) over which the driver straddles the main frame (4),
The main frame (4) is formed with an opening (25) that opens upward so as to face the straddle (S),
A straddle-type electric vehicle characterized in that a main battery (24) for supplying electric power to an electric motor (18) as a drive source is detachably accommodated in the opening (25). The opening (25) is formed in a U-shaped cross section that opens upward,
The straddle-type electric vehicle according to claim 1, wherein the main battery (24) is accommodated in contact with an inner wall of the opening (25).   The straddle-type electric vehicle according to claim 2, wherein a cooling rib (26) is provided integrally with the main frame (4).   An extra battery (41) for supplying electric power to the electric motor (18) separately from the main battery (24) is detachable above the main battery (24) and above the opening (25). The straddle-type electric vehicle according to any one of claims 1 to 3, wherein the saddle type electric vehicle can be attached. A vehicle body cover (32) extending from the head pipe (3) to a rear portion of the main frame (4) and covering the main frame (4);
The main battery (4) and the extra battery (41) are covered by the vehicle body cover (32), and the vehicle body cover (32) includes a traveling wind to the main battery (24) and the extra battery (41). The straddle-type electric vehicle according to claim 4, wherein an intake port (40) for guiding the air is formed.

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