JP5225956B2 - Electric saddle type vehicle - Google Patents

Description

  The present invention relates to an electric straddle-type vehicle, and more particularly to an electric straddle-type vehicle in which driving wheels are driven by an electric motor.

  2. Description of the Related Art Conventionally, an electric straddle-type vehicle that drives driving wheels by an electric motor is known.

  In Patent Document 1, in a scooter-type electric vehicle having a cantilever swing arm that pivotally supports a rear wheel with a single arm portion, a reduction gear using a planetary gear is used to bring the same position as the axle of the rear wheel. An arrangement layout is disclosed in which the output shaft of the electric motor is arranged and the control device for the electric motor is housed inside the arm portion.

JP 2004-122981 A

  However, since the electric vehicle described in Patent Document 1 drives the rear wheels by a motor coaxially provided on the rear wheel shaft, a driving torque cannot be increased by a reduction mechanism. It is difficult to provide an inexpensive electric motorcycle, and the electric motor and the control unit (motor driver) are both housed in one arm portion provided on the left side in the vehicle width direction of the swing arm. The distribution was larger than the right side of the car body, and the weight balance was poor, and the swing arm rigidity had to be increased.

  The object of the present invention is to solve the above-mentioned problems of the prior art and to achieve a lightweight and inexpensive electric straddle-type vehicle using a small and highly versatile motor, but also in the left-right weight balance with respect to the vehicle center line. It is an object of the present invention to provide an electric straddle-type vehicle that can be optimized and, in turn, leads to weight reduction of the swing arm.

  In order to achieve the above-mentioned object, according to the present invention, a swing arm (12, 214) that is pivotally supported on a body frame and pivotally supported on a rear wheel, and a rear wheel (WR) is rotationally driven. Electric straddle type in which the swing arm (12, 214) includes an electric motor (50, 250) for supplying force and a motor driver (35, 216) having a drive circuit for the electric motor (50, 250). In the vehicle (1,200), the electric motor (50, 250) is rotated at a position on one side in the vehicle width direction of the rear wheel (WR) in a side view of the vehicle body. The shaft (53,278) and the rear wheel (WR) axle (19,253) are parallel and offset in the vehicle width direction, and the outer diameter of the electric motor (50,250) and the rear wheel (WR). Overlaps with the outer diameter of The motor driver (35, 216) is disposed at a position in front of the rear wheel (WR) in the vehicle body and across the vehicle body center line (C) in the vehicle width direction. The point has the first feature.

  Further, the motor driver (35, 216) is disposed such that its center of gravity (G2) is offset in a direction opposite to the offset direction with respect to the vehicle center line (C) of the electric motor (50, 250). The point has the second feature.

  The motor driver (216) is disposed on the vehicle body rear side of the swing shaft (215) at a position near the swing shaft (215) of the swing arm (214), and the swing arm (214). The third feature is that it is inserted into the recess (308) opened on the upper surface side of 214) and attached to the inside of the swing arm (214).

  The motor driver (216) includes a main body portion (312) and a lid member (264) fixed to the upper portion of the main body portion (312), and a motor energization is performed on a lower surface of the lid member (264). The switching element (316) for performing intermittent connection is supported at least, and the lid member (264) is exposed to the outside when the motor driver (216) is attached to the swing arm (214). There is a fourth feature.

  A fifth feature is that a mounting portion (306) for fixing the motor driver (216) to the swing arm (214) is formed on the lid member (264).

  The motor driver (216) has a terminal (269) to which a power harness (258) for supplying electric power to the switching element (316) group and the battery (213) is connected, and is disposed substantially at the center of the vehicle body. Smoothes the power supplied to the coupler unit (268) and the inverter to which the harness (256) of the control system is connected at a position offset in the vehicle width direction and outside the vehicle center line (C) of the electric motor (250). The sixth feature is that the capacitor (323) is arranged.

  Further, the motor driver is disposed at a position near the swing axis of the swing arm and on the lower side of the vehicle body from the swing shaft, and is inserted through an opening provided toward the lower surface of the swing arm. The seventh feature resides in that it is attached to the inside of the swing arm.

  An eighth feature is that an electric fan is provided on the upper surface of the swing arm at a position above the motor driver.

  In addition, a plurality of heat dissipating fins integrally formed on the upper surface of the swing arm and extending above the vehicle body are provided above the motor driver, and the electric fan has its rotating shaft directed in the vehicle body vertical direction. The ninth feature is that the heat dissipating fins are arranged on the top.

  And a center stand that is pivotally supported with respect to the vehicle body frame. The center stand is configured to abut the lower surface of the swing arm below the motor driver body when the center stand is retracted. There is a tenth feature.

  According to the first feature, since the electric motor is provided at a position on one side of the rear wheel in the vehicle width direction so that the motor shaft is parallel to and offset from the rear wheel shaft, a reduction mechanism is provided in the drive mechanism system. It is possible to select a motor that is lightweight, inexpensive, and highly versatile. The motor driver is disposed at a position where the outer diameter of the motor and the outer diameter of the rear wheel overlap, and the motor driver is disposed across the vehicle body center line in the vehicle width direction at a position in front of the vehicle body of the rear wheel. Therefore, the motor driver is arranged closer to the center in the vehicle width direction than the electric motor, and both the electric motor and the motor driver are arranged offset in the same direction with respect to the vehicle body center line. In comparison, the center of gravity position in the vehicle width direction can be set closer to the center of the vehicle body. This improves the weight balance in the vehicle width direction, reduces the burden on the swing axis of the swing arm, and further reduces the weight of the swing arm itself.

  According to the second feature, the motor driver is disposed so that the center of gravity of the motor driver is offset in the direction opposite to the offset direction with respect to the center line of the body of the electric motor. Compared to the configuration in which the center of gravity of the vehicle body is closer to the electric motor because it is on the line, it is possible to adjust the weight balance in the vehicle width direction by shifting the center of gravity of the motor driver toward the center in the vehicle width direction.

  According to the third feature, the motor driver is disposed on the rear side of the swing shaft at the position close to the swing axis of the swing arm and is inserted into the recess opened on the upper surface side of the swing arm. Since the motor driver, which is a heavy object, is disposed at a low position in the vehicle body, the center of gravity of the electric vehicle can be lowered. Further, since the heavy motor driver is disposed adjacent to the swing axis of the swing arm, the moment of inertia when the swing arm swings can be reduced.

  According to the fourth feature, the motor driver has a main body portion and a lid member fixed to the upper portion of the main body portion, and at least a switching element for intermittently energizing the motor is supported on the lower surface of the lid member. When the motor driver is attached to the swing arm, the lid member is exposed to the outside, so that the heat of the switching element generated when the motor driver is driven can be efficiently cooled.

  According to the fifth feature, since the lid member is formed with an attachment portion for fixing the motor driver to the swing arm, the lid member can be provided with an attachment function to the swing arm. A separate part for mounting becomes unnecessary, and the number of parts can be reduced.

  According to the sixth feature, the motor driver has a terminal to which a power supply harness for supplying power to the switching element group and the battery is connected substantially at the center of the vehicle body, and the offset direction with respect to the vehicle center line of the electric motor. In addition, a coupler unit to which the control system harness is connected and a capacitor that smoothes the power supplied to the inverter are arranged at positions outside the vehicle width direction, so that the switching element and the large-diameter power harness can be connected to the swing arm. It becomes possible to arrange at a position where it is difficult to receive the moment in the left-right direction. In addition, by placing large parts such as capacitors and couplers on the outer side in the vehicle width direction opposite to the arm part of the swing arm, the degree of freedom in designing the swing arm is increased, and thus the motor extending in the vehicle width direction The driver space can be used effectively.

  According to the seventh feature, the motor driver is disposed at a position close to the swing axis of the swing arm, on the lower side of the vehicle body from the swing shaft, and an opening provided toward the lower surface of the swing arm. Since the motor driver, which is a heavy object, is disposed at a low position in the vehicle body, the center of gravity of the electric vehicle can be lowered. In addition, the motor driver can be removed from the inside of the swing arm from below in the opening provided on the lower surface of the swing arm, making it possible to remove the motor driver without removing the swing arm, improving maintenance. It becomes possible to make it.

  According to the eighth feature, since the electric fan is provided on the upper surface of the swing arm at a position above the motor driver, the motor driver can be actively cooled by forced air blowing by the electric fan.

  According to the ninth feature, the motor fan includes a plurality of heat dissipating fins integrally formed on the upper surface of the swing arm and extending upward of the vehicle body above the motor driver. Since it is arrange | positioned toward the upper part of the radiation fin, the cooling effect of a motor driver can be heightened more.

  According to the tenth feature, the center stand is pivotally supported with respect to the vehicle body frame, and the center stand is configured to contact the lower surface of the swing arm below the vehicle body of the motor driver when retracted. Therefore, the center stand is positioned below the motor driver during traveling, and the center stand can protect the lower surface of the swing arm from stone splashes during traveling. Accordingly, it is not necessary to make the lower surface of the swing arm that protects the motor driver thicker than necessary, and the swing arm can be reduced in weight.

1 is a side view of an electric vehicle according to an embodiment of the present invention. It is a rear perspective view of an electric vehicle. It is a front perspective view of an electric vehicle. It is a top view of an electric vehicle. It is a side view of a swing arm. It is sectional drawing of a swing arm. It is a side view of the transmission case which comprises a swing arm. It is a front view of a motor driver. It is a bottom view of a motor driver. It is a perspective view which shows the attachment structure of a low voltage battery. FIG. 2 is a partially enlarged view of FIG. 1. It is a side view which shows the accommodation state of a center stand. It is a side view of the electric vehicle which concerns on 2nd Embodiment of this invention. It is a side view of a swing arm. It is a partially enlarged view of the vehicle body right side view. FIG. It is a side view of the electric vehicle with which the rear fender which concerns on a modification is attached. It is the partially expanded view of the vehicle body right side view to which the rear fender concerning the modification was attached. It is a partially expanded view of the vehicle body top view to which the rear fender according to the modification is attached. It is a perspective view of the swing arm which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the state which the swing arm and the motor driver isolate | separated. It is sectional drawing of the swing arm seen from the vehicle body upper direction. It is an expanded sectional view showing a mechanism around an electric motor. It is a top view of the motor driver which concerns on 2nd Embodiment of this invention. It is a front view of the motor driver which concerns on 2nd Embodiment of this invention. It is a side view of the motor driver which concerns on 2nd Embodiment of this invention. It is the LL sectional view taken on the line of FIG. It is the KK sectional view taken on the line of FIG. It is the JJ sectional view taken on the line of FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of a saddle riding type electric vehicle 1 according to an embodiment of the present invention. FIG. 2 is a rear perspective view of the electric vehicle 1 with the exterior parts removed. The electric vehicle 1 is a scooter type motorcycle having a low-floor floor 9a, and is configured to drive the rear wheel WR with the rotational driving force of an electric motor 50 (see FIG. 4) installed in the swing arm 12. ing. The high voltage battery 31 that supplies electric power to the electric motor 50 can be charged by connecting an external power source to a charging port (not shown) provided in the vehicle body.

  A head pipe 3 that rotatably supports a steering stem 7a is coupled to the front end portion of the main frame 2. A steering handle 7 is attached to the upper part of the steering stem 7a, and a pair of left and right front forks 4 are attached to one lower part. A front wheel WF is rotatably supported at the lower end of the front fork 4.

  A pair of left and right lower frames 5 are connected below the main frame 2, and a high voltage battery 31 (for example, 72 V) that supplies electric power to the electric motor 50 is sandwiched between the left and right lower frames 5. It is arranged. The lower frame 5 is bent to the upper side of the vehicle body on the rear side, and is connected to a rear frame 6 that supports the luggage compartment 17 and the like.

  A pivot plate 20 on which a swing arm pivot 11 is formed is attached to the rear portion of the lower frame 5. The swing arm pivot 11 is pivotally supported at the front end of a cantilever swing arm 12 that supports the rear wheel WR with only the left arm in the vehicle width direction. A rear wheel WR is rotatably supported on the rear portion of the swing arm 12 by an axle 19, and a rear end portion of the swing arm 12 is suspended from the rear frame 6 by a rear shock unit 13.

  A motor driver (or PDU: power drive unit) 35 that converts a direct current supplied from the high voltage battery 31 into an alternating current and supplies the alternating current to the electric motor 50 is disposed below the swing arm 12. ing. The power supplied from the motor driver 35 is supplied to the electric motor 50 via the three power supply lines L. A first reduction gear 46 and a second reduction gear 47 of a reduction mechanism, which will be described later, are disposed on the rear side of the electric motor 50, and the rear wheel WR is driven by the axle 19 fixed to the second reduction gear 47. Is done. A smoothing capacitor 36 is disposed in the vicinity of the motor driver 35.

  A front cowl 9 as an exterior part is provided on the vehicle body front side of the steering handle 7, and a meter unit 8 including a speedometer and the like is attached to the upper part of the front cowl. A headlamp 10 is provided on the front side of the vehicle body of the front cowl 9. In addition, a low floor 9 a on which an occupant puts his / her foot is formed on the upper portion of the high voltage battery 31, and a seat cowl 15 is provided outside the rear frame 6. A seat 14 that is opened and closed by a hinge on the front side of the vehicle body is attached to the upper portion of the seat cowl 15. A tail lamp device 16 is attached to the rear end portion of the seat cowl 15. A center stand 18 having two legs spaced apart in the vehicle width direction is attached to the pivot plate 20. The center stand 18 is pivotally supported by a stand bracket 150 coupled to the lower frame 5 on the inner side in the vehicle width direction of the pivot plate 20.

  On the right side of the head pipe 3 in the vehicle width direction, a low voltage battery 30 (for example, 12V) for supplying electric power to the electric auxiliary machines such as the headlamp 10 and the control device is disposed. The low voltage battery 30 is charged by the power of the high voltage battery 31. A DC-DC converter 32 that converts the high voltage (72V) of the high-voltage battery 31 to a low voltage (12V) and a contactor box that houses a fuse, a relay, and the like, inside the seat cowl 15 and in front of the cargo compartment 17 33 is arranged. Further, a control device (MGU: managing unit) 34 for controlling the motor driver 35 and the like is attached to the outside of the rear frame 6 on the right side in the vehicle width direction via an attachment stay 34a.

  With reference to FIG. 10, the attachment structure of the low voltage battery 30 is demonstrated. The low voltage battery 30 is housed in a battery case 30 a and is disposed on the side of the head pipe 3. The battery case 30 a is fixed to the lower stay 3 b welded to the main frame 2 and the upper stay 3 a welded to the head pipe 3. The upper stay 3a is formed with a boss having a screw hole. After the low voltage battery 30 is stored in the battery case 30a, the upper part of the holding plate 30b extending from the lower part of the battery case 30a is connected to the upper side by the fastening screw 30c. By fixing to the stay 3a, the low voltage battery 30 is disposed at a predetermined position.

  FIG. 3 is a front perspective view of the electric vehicle 1. FIG. 4 is a top view of the electric vehicle 1. The same reference numerals as those described above denote the same or equivalent parts. The main frame 2 and the pair of left and right lower frames 5 formed of a round pipe material are connected to each other by a reinforcing pipe 24 extending in the vehicle width direction at the lower end portion of the main frame 2. Gussets 23 are welded to the left and right lower frames 5. A holding member 22 for holding the high voltage battery 31 is fixed to the gusset 23 by a fastening member such as a screw.

  The cargo compartment 17 is disposed so as to be sandwiched between the left and right rear frames 6, and the DC-DC converter 32 and the contactor box 33 are disposed in proximity to a slope portion formed in the lower front portion of the cargo compartment 17. Yes. The MGU 34 is attached to the rear frame 6 on the right side in the vehicle width direction via an attachment stay 34a.

  With reference to FIG. 11, a mounting structure of the DC-DC converter 32 and the like will be described. A cross member 6 a that connects the left and right rear frames 6 is disposed on the vehicle body rear side of the DC-DC converter 32 and the contactor box 33. The cross member 6a is provided with a mounting stay 92 having a vertically symmetrical shape for supporting the DC-DC converter 32, a mounting stay 94 extending downward to support the contactor box 33, and a front end portion of the luggage compartment 17. A mounting stay 96 extending rearward is attached for support.

  The DC-DC converter 32 is fixed by a mounting screw 93 that is screwed to the mounting stay 92 from the rear side of the vehicle body, and the contactor box 33 is screwed to the mounting stay 94 from the rear side of the vehicle body. It is fixed by mounting screws 95. The luggage compartment 17 is fixed to the front end portion thereof by an attachment screw 98 that is screwed onto the attachment boss 97 and the attachment stay 96 from above. The cross member 6a can be provided with a plurality of support portions for the luggage compartment 17. Further, a maintenance lid 91 is provided on the vehicle body front side of the DC-DC converter 32 and the contactor box 33 so that a part of the exterior member 90 can be opened and closed.

  As described above, the low voltage battery 30 is disposed on the right side of the head pipe 3. Thus, the low voltage battery 30 is disposed offset to the right in the vehicle width direction with respect to the vehicle body center line C. Further, the high voltage battery 31 is disposed such that its center of gravity G1 is offset to the right in the vehicle width direction with respect to the vehicle body center line C. In the electric vehicle 1 according to the present embodiment, due to the arrangement of the low-voltage battery 30 and the high-voltage battery 31, the weight balance in the vehicle width direction is offset by the electric motor 50 being offset to the left in the vehicle width direction. It is arranged.

  Since the electric vehicle 1 has the electric motor 50 disposed on the arm portion of the cantilever swing arm 12, the heavy electric motor 50 is offset from the vehicle body center line C on the left side in the vehicle width direction. Thus, the weight balance in the vehicle width direction tends to be biased to the left in the vehicle width direction. However, in the present embodiment, the low-voltage battery 30 positioned on the front side of the vehicle body is offset on the right side in the vehicle width direction, whereby the center of gravity position of the vehicle body can be brought closer to the vehicle body center line C. Further, by setting the center of gravity position G1 of the high-voltage battery 31 to the right of the vehicle body center line C in the vehicle width direction, the center of gravity position of the vehicle body can be further brought closer to the vehicle body center line C.

  For example, even when the high voltage battery 31 is disposed so that the vehicle width direction dimension is equal to the left and right with respect to the vehicle body center line C, the center of gravity position G1 is offset to the right of the vehicle body center line C. A structure in which the thickness on the right side in the vehicle width direction (longitudinal dimension) is larger than the thickness on the left side can be applied.

  FIG. 5 is a side view of the swing arm 12. The same reference numerals as those described above denote the same or equivalent parts. The motor driver 35 is stored in a storage space provided on the lower surface side of the swing arm 12. The storage space is configured to form a closed space by attaching the cover member 21 from the lower side of the vehicle body using screws or the like. In the lower part of the cover member 21, a drain hole 21a for discharging moisture is formed on the rear side of the vehicle body.

  The end of the cover member 21 on the front side of the vehicle body protrudes to the front side up to a substantially central position of the swing arm pivot 11. The motor driver 35 is housed in this storage space and is disposed at a position on the front side of the vehicle body near the swing arm pivot 11. As a result, the heavy motor driver 35 is disposed at a low position on the vehicle body, and the center of gravity of the electric vehicle 1 can be lowered. Further, since the motor driver is disposed adjacent to the swing arm pivot 11, the moment of inertia when the swing arm 12 swings can be reduced.

  The electric motor 50 is disposed in the space in the swing arm 12 so as to overlap, that is, overlap with, the projection area of the rear wheel WR in a side view of the vehicle body. Between the motor driver 35 and the electric motor 50, a U-phase wiring 27, a V-phase wiring 28, and a W-phase wiring 29 serving as a power supply line L are routed. A first reduction gear 46 and a second reduction gear 47 of a reduction mechanism are disposed on the rear side of the electric motor 50, and the rear wheel WR is an axle 19 that is a rotation shaft of the reduction gear 24 (see FIG. 1). Driven by. A rear shock unit mounting portion 25 that pivotally supports the lower end portion of the rear shock unit 13 is provided at the rear end portion of the swing arm 12.

  A smoothing capacitor 36 for removing the vibration of the voltage waveform is disposed on the side of the motor driver 35. The substantially cylindrical smoothing capacitor 36 is fixed to the inner wall surface of the swing arm 12 via the mounting stay 26.

  As shown in FIG. 1, the electric vehicle 1 is provided with a center stand 18 having a rotating shaft in a body frame. The center stand 18 is configured such that the left leg portion in the vehicle width direction contacts the lower surface of the case member when the center stand 18 is stored. As a result, during traveling, the center stand 18 can protect the cover member 21 from stone splashes during traveling, and it is not necessary to make the cover member 21 thicker than necessary, thereby reducing the weight of the swing arm 12. Can be planned. On the lower surface of the swing arm 12, a stand stopper 151 with which a rubber member provided on a leg portion of the center stand 18 abuts is attached.

  Referring to FIG. 12, a rubber member 152 is attached to a leg portion on the left side in the vehicle width direction of the center stand 18 with an attachment screw 153. The center stand 18 is applied with an urging force in the storage direction by a spring or the like. When the center stand 18 is stored, the rubber member 152 is held in contact with the stand stopper 151.

  FIG. 6 is a cross-sectional view of the swing arm 12 as viewed from above the vehicle body. The same reference numerals as those described above denote the same or equivalent parts. The swing arm 12 is pivotally supported via a swing arm pivot (pivot shaft) 11 with respect to a pair of left and right pivot plates 20. The pivot shaft 11 is a long bolt having a screw head 64, and is inserted into a cylindrical collar 63 supported by a boss 61 on the swing arm 12 side via a bush 62, and by a nut 89 on the right side in the vehicle width direction. It is fixed. The bush 62 is thermally fixed to the cylindrical collar 63, and a thin color member is thermally fixed to the outer peripheral side of the bush 62. The collar member and the bush 62 are press-fitted into the through hole of the boss 61, whereby the position of the swing arm 12 in the vehicle width direction is defined.

  A wide case portion 80 for accommodating the motor driver 35 is formed on the vehicle body front side of the swing arm 12. The cover member 21 (see FIG. 1) is attached to the vehicle body lower surface side of the wide case portion 80. A plurality of radiating fins 81 for cooling the motor driver 35 are integrally provided on the upper body of the wide case portion 80, and a cooling effect is enhanced by forced air blowing on the upper side of the radiating fins 81. The electric fan 82 is disposed.

  As described above, the motor driver 35 is housed in the wide case portion 80 in front of the rear wheel WR. Accordingly, the motor driver 35 is disposed closer to the front of the swing arm 12 so as to straddle the vehicle body center line C passing through the front and rear wheels of the electric vehicle 1 in the vehicle width direction. In the electric vehicle 1 according to the present embodiment, by arranging the motor driver 35, the electric motor 50 is offset on the left side in the vehicle width direction so as to adjust the weight balance in the vehicle width direction. There are features.

  Since the electric vehicle 1 has the electric motor 50 disposed on the arm portion of the cantilever swing arm 12, the heavy electric motor 50 is offset from the vehicle body center line C on the left side in the vehicle width direction. Thus, the weight balance in the vehicle width direction tends to be biased to the left in the vehicle width direction. However, in the present embodiment, the motor driver 35 is not only disposed so as to straddle the vehicle body center line C, but is disposed so that the gravity center position G2 of the motor driver 35 is located on the right side in the vehicle width direction. It is possible to make the center of gravity position closer to the vehicle body center line C.

  With the above configuration, for example, the weight balance in the vehicle width direction is improved and the swing is improved as compared with the configuration in which both the electric motor and the motor driver are offset in the same direction with respect to the vehicle body center line. The burden on the arm pivot can be reduced.

  The swing arm 12 according to the present embodiment is a cantilever type in which the rear wheel WR is pivotally supported by only the left arm portion, and the electric motor 50 and the connecting / disconnecting rotational driving force are located at the vehicle body rear side of this arm portion. A centrifugal clutch 40 and a speed reduction mechanism 70 as mechanisms are arranged in a concentrated manner.

  The electric motor 50 is an inner rotor type that is fixed to the inner wall of the swing arm 12 and includes a stator 51 having a stator coil 71 and a rotor 52 fixed to a motor drive shaft 53. The centrifugal clutch 40 includes a drive plate 42 provided with a clutch shoe 44 and a clutch outer 41 that is driven to rotate by the frictional resistance of the clutch shoe 44. The drive plate 42 is fixed to the left end of the motor drive shaft 53 in the figure, while the clutch outer 41 is fixed to the output shaft 43 that is rotatably inserted into the motor drive shaft 53 by a nut 66. Yes. The motor drive shaft 53 and the output shaft 43 are configured to be mutually rotatable by two needle roller bearings 75 and 76.

  In the centrifugal clutch 40, when the motor drive shaft 53 reaches a predetermined rotation or more, that is, when the drive plate 42 reaches a predetermined rotation or more, the clutch shoe 44 moves radially outward to generate a frictional resistance force. The clutch outer 41 is configured to be driven to rotate. Thereby, the rotational driving force of the electric motor 50 is transmitted to the output shaft 43.

  The rotational driving force transmitted to the output shaft 43 is transmitted to the final output shaft 48 (axle 19) via the speed reduction mechanism 70. Specifically, a first reduction gear 46 that meshes with a reduction gear formed at the right end of the output shaft 43 in the figure, a bearing 79 that is fixed to the first reduction gear 46 and fitted in a reduction gear case 67, and The first reduction shaft 45 that is rotatably supported by a bearing 78 fitted to the transmission case 68 and the second reduction gear 47 that meshes with the reduction gear formed on the first reduction shaft 45, 2 A bearing 86 fixed to the reduction gear 47 and fitted to the transmission case 68 and a bearing 88 fitted to the reduction gear case 67 are transmitted to the final output shaft 48 rotatably supported. .

  A wheel 56 of the rear wheel WR is fixed to the right output end of the final output shaft 48 with a nut 72 via a collar 69. A brake drum having a liner 85 is formed on the inner diameter side of the wheel 56, and a pair of upper and lower brake shoes 83 driven by the brake cam 49 around the anchor pin 84 are housed inside the brake drum. An oil seal 87 is arranged on the left side of the bearing 88 in the figure. An integral swing arm case 65 is attached to the outside of the smoothing capacitor 36 and the centrifugal clutch 40 in the vehicle width direction.

  An integral swing arm case 65 is attached to the outside of the smoothing capacitor 36 and the centrifugal clutch 40 in the vehicle width direction. A non-contact type vehicle speed sensor 57 that detects the vehicle speed based on the rotation speed of the second reduction gear 47 is disposed adjacent to the right side of the second reduction gear 47 in the drawing.

  FIG. 7 is a side view of the transmission case 66 constituting the swing arm 12. In this figure, the state seen from the vehicle width direction right side is shown. The same reference numerals as those described above denote the same or equivalent parts as described above. On the rear side of the transmission case 66, a first through hole 43a into which the output shaft 43 (see FIG. 7) is inserted via the bearing 60, a second through hole 45a formed concentrically with the first reduction shaft 45, A third through hole 48 a formed concentrically with the final output shaft 48 is formed.

  A wide case portion 80 in which the motor driver 35 is accommodated is integrally formed on the front side of the transmission case 66. As described above, the storage space for the motor driver 35 is formed by attaching the cover member 21 (see FIG. 5) below the wide case portion 80. The above-described heat radiation fins 81 are integrally formed with the wide case portion 80 so as to be erected from below the body upward.

  An electric fan 82 is attached to the top of the plurality of heat radiation fins 81. The rotating shaft 82a of the electric fan 82 is disposed in the vertical direction of the vehicle body. When the motor is energized, the rotating shaft 82a is blown upward by the plurality of blade members attached to the rotating shaft 82a. As a result, the motor driver 35 that has become high temperature due to heat during operation can be efficiently cooled by the radiation fins 81.

  8 and 9 are a front view of the motor driver 35 viewed from the front of the vehicle body and a bottom view of the motor driver 35 viewed from below the vehicle body. The same reference numerals as those described above denote the same or equivalent parts. A U-phase wiring 27, a V-phase wiring 28, and a W-phase wiring that extend behind the swing arm 12 and supply electric power to the electric motor 50 are provided on the left side surface (right end surface in the drawing) of the motor driver 35 in the vehicle width direction. 29 (see FIG. 5) is routed. Further, two power supply lines 101 from the high-voltage battery 31 and three signal lines 102a to which drive signals from the MGU 34 are input are connected to the front end face of the motor driver 35 on the vehicle body. The signal line 102 a is inserted into the motor driver 35 through the waterproof vibration-proof rubber 102. In addition, two connecting lines 103 for inputting / outputting electric power to / from the smoothing capacitor 36 are connected to the right end face in the figure.

  As described above, according to the electric vehicle 1 according to the present invention, in the vehicle in which the electric motor 50 is offset from the vehicle body center line C on the left side in the vehicle width direction, the motor driver 35 is straddled across the vehicle body center line C. Since the motor driver 35 is arranged so that the center of gravity G2 of the motor driver 35 is offset to the right from the vehicle body center line C, the weight balance that tends to be biased to the left in the vehicle width direction is reduced. It becomes possible to approach the vehicle body center line C by the arrangement structure. With the above-described configuration, for example, the weight balance in the vehicle width direction is improved compared to a configuration in which both the electric motor and the motor driver are offset in the same direction with respect to the vehicle body center line, and the swing arm The burden on the pivot can be reduced.

  FIG. 13 is a side view of an electric vehicle 200 according to the second embodiment of the present invention. The electric vehicle 200 has the same basic structure as that of the electric vehicle 1 shown in the first embodiment. In the vehicle in which the electric motor 250 is disposed in the vicinity of the axle 253 of the cantilever swing arm 214, the motor The driver 216 is disposed on the rear side of the swing arm pivot (swing shaft) 215 so as to straddle the vehicle body center line C, and the gravity center position G2 of the motor driver 216 is located on the right side in the vehicle width direction from the vehicle body center line C. The points configured in this way are also common.

  The main difference from the electric vehicle 1 shown in the first embodiment is that a motor driver 216 is attached so as to be inserted from above into a recess 308 opened on the upper surface side of the swing arm 214, and a lid of the motor driver 216. The member 264 is provided with an attachment portion 306 for attaching the motor driver 216 to the swing arm 214, the center stand 218 is attached to the lower surface of the swing arm 214, and the rear wheel WR fender (mud) on the upper surface of the motor driver 216. Is attached). Note that the configuration applied to the electric vehicle 200 can be appropriately applied to the electric vehicle 1 according to the first embodiment.

  The electric vehicle 200 is a scooter type motorcycle having a low floor 212, and is configured to drive the rear wheel WR with the rotational driving force of the electric motor 250 provided in the swing arm 214. The high voltage battery 213 that supplies electric power to the electric motor 250 can be charged by connecting an external power source to the charging port 220 provided below the seat 221.

  A head pipe 202 that rotatably supports the steering stem 203 is coupled to the front end portion of the main frame 201. A steering handle 205 is attached to the upper part of the steering stem 203, and a pair of left and right front forks 204 are attached to one lower part. A front wheel WF is rotatably supported at the lower end of the front fork 204.

  Below the main frame 201, a pair of left and right lower frames 201a are connected, and a high voltage battery 213 is disposed so as to be sandwiched between the left and right lower frames 201a. The lower frame 201a is bent to the upper side of the vehicle body on the rear side and is connected to the rear frame 219.

  A pivot plate 227 having a swing arm pivot 215 is attached to the rear portion of the lower frame 201a. The swing arm pivot 215 pivotally supports the front end of a cantilever swing arm 214 that supports the rear wheel WR with only the left arm in the vehicle width direction. A rear wheel WR fixed to the axle 253 is rotatably supported at the rear portion of the swing arm 214. The rear end of the swing arm 214 is suspended from the rear frame 219 by the rear shock unit 223.

  A motor driver (PDU) 216 that converts a direct current supplied from the high voltage battery 213 into an alternating current and supplies the alternating current to the electric motor 250 is disposed at a position on the vehicle body front side of the swing arm 214. The power supplied from the motor driver 216 is supplied to the electric motor 250 via three power supply lines (see FIG. 14). A first reduction gear 251 and a second reduction gear 252 of a reduction mechanism, which will be described later, are disposed on the rear side of the electric motor 250, and the rear wheel WR is driven by an axle 253 fixed to the second reduction gear 252. Is done.

  A vehicle body center portion of the steering handle 205 is covered with a handle cover 206. The head pipe 202 is covered with a front cowl 210 on the front side of the vehicle body and a floor cover 210a on the rear side of the vehicle body. A carrier 207 is disposed on the front side of the front cowl 210, and a headlamp 209 is supported below the carrier 207 at the tip of a portion extending forward of the vehicle body. A front fender 208 of the front wheel WF is attached below the headlamp 209.

  A low-floor floor 212 on which an occupant can put his / her feet is formed on the high-voltage battery 213, and the outside of the rear frame 219 is covered with a seat cowl 211. A seat 221 that is opened and closed by a hinge on the front side of the vehicle body is attached to the upper portion of the seat cowl 211. A loading platform 226 is fixed to the rear of the seat 221, and a taillight device 224 and a pair of left and right blinker devices 225 are attached to the rear end portion of the seat cowl 211. A rear fender 222 of the rear wheel WR is attached to the upper surface of the swing arm 214 using fastening members 259 and 350 such as bolts.

  A side stand 217 is rotatably supported on the pivot plate 227 on the left side in the vehicle width direction. A center stand 218 having two legs spaced apart in the vehicle width direction is rotatably attached to the lower portion of the swing arm 214.

FIG. 14 is a side view of the swing arm 214. The same reference numerals as those described above denote the same or equivalent parts. This figure shows a state in which the swing arm cover 276 (see FIG. 22 ) attached to the left side in the vehicle width direction is removed from the transmission case 228 that supports main components such as the electric motor 250. A plurality of bolt fastening holes 244 are formed on the contact surface with the swing arm cover 214 at the outer periphery of the transmission case 228. A through hole 230 through which the pivot shaft passes is formed at the front end of the transmission case 228. The motor driver 216 is stored in a storage space having an opening on the upper surface side of the swing arm 214. The motor driver 216 is housed in this storage space and is disposed at a position on the front side of the vehicle body near the swing arm pivot 215. In the present embodiment, the motor driver 216 is configured not to protrude from the lower surface of the swing arm 214.

  The electric motor 250 is disposed in a space in the swing arm 214 so as to overlap, that is, overlap with the projection region of the rear wheel WR when viewed from the side of the vehicle body. Between the motor driver 216 and the electric motor 250, a U-phase wiring 235, a V-phase wiring 236, and a W-phase wiring 237 are routed as power supply lines. The three wires are connected to the motor driver 216 by terminals 232, 233 and 234. Further, the three wires are brought closer to the inner wall side by a guide plate 243 attached to the transmission case 228.

  The electric motor 250 is an inner rotor type including a stator 247 fixed to the stator case 246 by a fastening member 245 and a rotor 248 (see FIG. 20) fixed to the motor drive shaft 278. A rotation speed sensor 239 of the electric motor 250 is disposed on the outer periphery of the motor drive shaft 278. The guide plate 243 supports the connector 238 of the rotational speed sensor 239. A vehicle speed sensor 241 that detects the rotational speed of the second reduction gear 252 (see FIG. 22) fixed to the axle 253 is disposed on the rear side of the electric motor 250 in the vehicle body. The wiring 240 of the vehicle speed sensor 241 is also configured to pass through the right side of the guide plate 243 in the vehicle width direction.

  A mounting portion 229 of the center stand 218 is provided at the lower portion of the transmission case 228. Further, a lower support portion 242 that pivotally supports the lower end portion of the rear shock unit 223 is provided at the rear end portion of the transmission case 228.

  FIG. 15 is a partially enlarged view of the right side of the vehicle body. FIG. 16 is a partially enlarged view of the vehicle body as viewed from above. The same reference numerals as those described above denote the same or equivalent parts. A wide case portion 254 that forms a recess for housing the motor driver 216 is formed on the vehicle body front side of the swing arm 214. The attachment portion 229 that pivotally supports the center stand 218 is located at the approximate center of the wide case portion 254 in the longitudinal direction of the vehicle body.

  The rear shock unit 223 is attached between an upper support portion 257 provided on the rear frame 219 and a lower support portion 242 formed at the rear end portion of the swing arm 214. A sub frame 255 that supports the high voltage battery 213 is connected to the lower front portion of the vehicle body of the pivot plate 227.

  Referring to FIG. 16, the pair of left and right rear frames 219 in the vehicle width direction are positioned at the first connecting bar 260 located on the front side of the vehicle body of the motor driver 216 when viewed from above the vehicle body, and at the rear end of the motor driver 216 when viewed from above. The second connection bar 261 and the third connection bar 262 located near the axle of the rear wheel WR when viewed from above the vehicle body are connected to each other. A loading grip 263 is attached to the outer side of the rear frame 219 in the vehicle width direction.

  A control system harness 256 and a power system harness 258 are connected to the upper surface portion of the motor driver 216. In addition, a rear fender 222 that covers the front and top of the rear wheel WR is fixed to the motor driver 216. The rear fender 222 has a left-right asymmetric shape in which only the left side in the vehicle width direction extends rearward along the upper surface of the transmission case 228. The rear fender 222 is fixed to the swing arm 214 by one fastening member 350 that extends in the vehicle width direction and penetrates the end of the extended portion, and two fastening members 259 that are fixed to the upper surface of the motor driver 216. ing.

  Note that the rear fender of the electric vehicle 200 is not limited to the shape shown in FIGS. 1, 15, and 16, and may have the shape shown in FIGS. 17, 18, and 19, for example. In FIGS. 17, 18, and 19, the same reference numerals as those described above denote the same or equivalent parts. In this modification, the front end of the vehicle body of the rear fender 222a is extended to the front side of the vehicle body, and the rectangular cover portion 222b is integrally provided to protect the upper surface portion of the motor driver 216 at the same time in addition to the mudguard function. It is possible to do. The fastening method of the rear fender 222a to the swing arm 214 is also fixed to the upper surface of the motor driver 216 and one fastening member 350 that is fixed to the arm portion of the swing arm 214 in the vehicle width direction. Three fastening members 259 support the three points.

  FIG. 20 is a perspective view of the swing arm 214. FIG. 21 is a perspective view showing a state where the swing arm 214 and the motor driver 216 are separated. The same part as the above indicates the same or equivalent part. 20 and 21 show a state in which the swing arm cover 276 (see FIG. 22) attached to the left side in the vehicle width direction of the transmission case 228 is removed. The bosses 265 in which the through-holes 230 of the pivot shaft are formed are formed at the front end portion of the transmission case 228 and the front surface portion on the right side of the wide case portion 254 in the vehicle width direction.

  The wide case portion 254 is formed with a recess 308 that opens to the top of the vehicle body, and the motor driver 216 is housed inside the swing arm 214 by being inserted into the recess 308 from above. A through hole 309 for connecting the motor driver 216 and the power supply line is formed on the left side surface of the wide case portion 254 in the vehicle width direction.

  The motor driver 216 includes a main body portion 312 and a lid member 264 fixed to the upper portion of the main body portion 312. A plurality of through-holes 306 are formed at the edge of the lid member 264 as attachment portions for fixing the motor driver 216 to the swing arm 214. After the motor driver 216 is inserted into the recess 308, bolts as fastening members are formed. The motor driver 216 is fixed to the swing arm 214 by passing the 270 through the through-hole 306 and screwing the bolt 270 into the female screw portion 310 formed at the edge of the wide case portion 254. According to this configuration, the motor driver 216 is attached to the swing arm 214 so that the opening of the recess 308 is covered with the lid member 264 to form a closed space. The function will be demonstrated.

  On the upper surface of the lid member 264, there are two couplers 268 to which the control system harness 256 is connected, a plurality of cooling fins 266 directed in the longitudinal direction of the vehicle body, terminals 269 to which the power system harness 258 is connected, and a rear fender 222 (222a). Two attachment holes 267 for attachment are provided.

  FIG. 22 is a cross-sectional view of the swing arm 214 as seen from above the vehicle body. The same reference numerals as those described above denote the same or equivalent parts. The swing arm 214 is pivotally supported via a swing arm pivot (pivot shaft) 215 with respect to a pair of left and right pivot plates 227. The pivot shaft 215 is a long bolt having a screw head 271. The pivot shaft 215 is inserted into a cylindrical collar 273 supported by a boss 265 on the swing arm 214 side via a bush 274, and a nut 272 on the right side in the vehicle width direction. It is fixed. Note that the bush 274 is thermally fixed to the cylindrical collar 273, and a thin color member is thermally fixed to the outer peripheral side of the bush 274. The collar member and the bush 274 are press-fitted into the through hole 230 of the boss 265, whereby the position of the swing arm 214 in the vehicle width direction is defined.

  As described above, the motor driver 216 is housed in the wide case portion 254 in front of the rear wheel WR. Thus, the motor driver 216 is disposed closer to the front of the swing arm 214 so as to straddle the vehicle body center line C passing through the front and rear wheels of the electric vehicle 200 in the vehicle width direction. Also in the electric vehicle 200 according to the present embodiment, similarly to the electric vehicle 1, the weight balance in the vehicle width direction due to the electric motor 250 being offset to the left in the vehicle width direction by devising the arrangement of the motor driver 216. I try to adjust the bias.

  The swing arm 214 according to the present embodiment is a cantilever type in which the rear wheel WR is pivotally supported only by the left arm portion, and the electric motor 250 and the connecting / disconnecting rotational driving force are connected to the rear side of the arm portion of the vehicle body. A centrifugal clutch 282 and a speed reduction mechanism 360 as a mechanism are centrally arranged.

  The electric motor 250 is fixed to the inner wall of the swing arm 214 and is an inner rotor type including a stator 247 having a stator coil and a rotor 248 fixed to the motor drive shaft 278. The centrifugal clutch 282 includes a drive plate 280 provided with a clutch shoe 281 and a clutch outer 277 driven and rotated by the frictional resistance of the clutch shoe 281. The drive plate 280 is fixed to the left end of the motor drive shaft 278 in the figure, while the clutch outer 277 is fixed to an output shaft 283 that is rotatably inserted into the motor drive shaft 278. The motor drive shaft 278 and the output shaft 283 are configured to be mutually rotatable by a needle roller bearing 284 and a ball bearing 285.

  The centrifugal clutch 282 causes the clutch shoe 281 to move outward in the radial direction and generate a frictional resistance when the motor drive shaft 278 exceeds a predetermined rotation, that is, when the drive plate 280 exceeds a predetermined rotation. The clutch outer 277 is configured to be driven to rotate. As a result, the rotational driving force of the electric motor 250 is transmitted to the output shaft 283. The left end of the output shaft 283 in the vehicle width direction is pivotally supported by a bearing 279 fitted to the swing arm cover 276. Further, the right side of the output shaft 283 in the vehicle width direction is pivotally supported by a bearing 286 fitted to the transmission case 228 and a bearing 289 fitted to the reduction gear case 287.

  The rotational driving force transmitted to the output shaft 283 is transmitted to the final output shaft (axle) 253 via the speed reduction mechanism 360. Specifically, a first reduction gear 251 that meshes with a reduction gear 288 formed at the right end of the output shaft 283 in the figure, and a bearing 291 that is fixed to the first reduction gear 251 and fitted in the reduction gear case 287. And a first reduction shaft 290 that is rotatably supported by a bearing 292 fitted to the transmission case 228, and a second reduction gear 252 that meshes with a reduction gear formed on the first reduction shaft 290. Being transmitted to a final output shaft 253 rotatably supported by a bearing 293 fixed to the second reduction gear 252 and fitted to the transmission case 228 and a bearing 295 fitted to the reduction gear case 287; Become.

  A wheel 296 of the rear wheel WR is fixed to the right end portion of the final output shaft 253 in the figure via a collar 297. A brake drum having a liner 299 is formed on the inner diameter side of the wheel 296, and a pair of upper and lower brake shoes 298 driven by the brake cam 300 about the anchor pin 301 (see FIG. 23) is formed on the inner side. It is stored. An oil seal 294 is disposed on the left side of the bearing 295 in the figure.

  FIG. 23 is an enlarged sectional view showing a mechanism around the electric motor 250. The same reference numerals as those described above denote the same or equivalent parts. A cylindrical collar 302 having a magnet 303 attached thereto is fixed to the right end of the motor drive shaft 278 in the vehicle width direction. The motor rotation speed sensor 239 fixed to the transmission case 228 by the bolt 304 detects the rotation speed of the electric motor 250 by detecting the passing state of the magnet 303 accompanying the rotation of the motor drive shaft 278. An oil seal 304 is disposed on the left side of the bearing 286 in the figure.

  A non-contact type vehicle speed sensor 241 that detects the vehicle speed based on the rotational speed of the second reduction gear 252 is disposed adjacent to the left side of the second reduction gear 252 in the figure. The vehicle speed sensor 241 is fixed to the transmission case 228 by bolts 305.

  FIG. 24 is a top view of the motor driver 216. 25 is a front view thereof, and FIG. 26 is a side view thereof. The same reference numerals as those described above denote the same or equivalent parts. In the top view of FIG. 24, the front side of the vehicle body is directed upward in the figure. A total of eight through-holes 306 are formed on the peripheral edge of the lid member 264 of the motor driver 216. The peripheral edge portion of the lid member 264 is formed so as to be located outward from the main body portion 312, and thus the peripheral edge portion functions as an attachment flange that contacts the upper end surface of the wide case portion 254.

  The raised portion provided with the terminal 269 to which the power supply system harness 258 is connected is disposed on the right side in the vehicle width direction of the lid member 264 and on the front side of the vehicle body. A total of eleven cooling fins 266 oriented in the longitudinal direction of the vehicle body are formed from the left end portion in the vehicle width direction to the rear of the raised portion. The cooling fin 266 extends to the upper side of the vehicle body up to substantially the same height as the upper surface of the raised portion. The two couplers 268 to which the control system harness 256 is connected are disposed on the right side in the vehicle width direction. An insulating sheet 311 described later is disposed at a position adjacent to the control system harness 256 and below the cooling fin 266. Terminals 313, 314, and 315 for connecting three power supply lines are provided on the left side surface of the main body 312 in the vehicle width direction. The insulating sheet 311 and the terminal 269 are disposed in the vicinity of the vehicle body center line C, that is, approximately at the vehicle body center portion. Further, a capacitor 323 and a coupler 268 described later are disposed on the outer side in the vehicle width direction from the terminal 269 and the insulating sheet.

  27 is a cross-sectional view taken along line LL in FIG. On the back side of the lid member 264, an FET 316 is disposed as a switching element for intermittently energizing the motor. A total of twelve FETs 316 are fixed to the lid member 264 by fastening members via the insulating sheet 311 described above. In the motor driver 216 according to this embodiment, the cooling fin 266 is formed and the FET 316 is supported on the back side of the portion functioning as a heat sink, thereby enabling the FET 316 that generates heat when the motor is driven to be efficiently cooled. Yes.

  28 is a cross-sectional view taken along the line KK of FIG. FIG. 29 is a sectional view taken along line JJ. As described above, the FET 316 is directly attached to the back surface side of the lid member 264 via the insulating sheet 311. Below the FET 316, a power substrate 319 that conducts high-voltage current is fixed by a total of three bosses 318 that extend from the back side of the lid member 264. As a result, the power board 319 is also disposed close to the lid member 264, and the power board 319 is efficiently cooled when the motor is driven.

  When attaching the FET and the power substrate 319 to the lid member 264, first, the FET 316 is fixed to the back surface side of the lid member 264, and then the power substrate 319 is disposed at a predetermined position to be provided in each FET 316. The connected terminal is passed through the power board 319. Next, the FET 316 and the power substrate 319 are connected by flow soldering, and then the power substrate 319 is fixed to the boss 318.

  In addition, two capacitors 323 that smooth the power supplied to the inverter and a connecting member 322 that is connected to the terminal 269 are attached to the upper surface of the power board 319. Further, a film capacitor 317 that absorbs inverter surge is provided between the lid member 264 and the main body 312, and a film capacitor 322 is also provided below the power substrate 319. A power transformer 321 that performs power conversion is attached to a control board 320 on which a control system element is mounted, and the control board 320 that is less necessary for heat generation is fixed near the lower end of the main body 312. The inside of the main body portion 312 is insulated by a resin mold or the like after the lid member and the main body portion 312 are fastened by a fastening member such as a bolt and each substrate is attached to the main body portion 312. The elements directly supported by the lid member 264 are not limited to the above-described FET 316 and the power substrate 319, and may include other elements that have a high need for countermeasures against heat generation.

  The shape and structure of the swing arm, the electric motor, the motor driver, the low voltage battery, the high voltage battery, etc., the arrangement relationship between the motor driver and the electric motor, etc. are not limited to the above embodiment, and various changes can be made. For example, the motor driver may be disposed on the upper surface side of the swing arm and offset at the position to the right of the vehicle body center line. Further, the swing arm may be a cantilever type having an arm portion only on the right side of the vehicle body, the electric motor may be housed in the rear portion of the arm portion, and the center of gravity position of the motor driver may be offset to the left side of the vehicle body center line. The electric vehicle according to the present invention is not limited to a motorcycle but may be a tricycle or a four-wheel vehicle.

  DESCRIPTION OF SYMBOLS 1,200 ... Electric vehicle, 2 ... Main frame, 3 ... Head pipe, 5 ... Side frame, 11, 215 ... Swing arm pivot, 12, 214 ... Swing arm, 17 ... Cargo compartment, 18 ... Center stand, 20, 227 ... Pivot plate, 30 ... Low voltage battery, 31,213 ... High voltage battery, 32 ... DC-DC converter, 33 ... Contactor box, 34 ... Control unit (MGU), 35,216 ... Motor driver, 40 ... Centrifuge clutch (Connection / disconnection mechanism), 41 ... clutch outer, 42 ... drive plate, 43 ... output shaft, 44 ... clutch shoe, 50, 250 ... electric motor, 51 ... stator, 52 ... rotor, 53, 278 ... motor drive shaft, 70 ... Deceleration mechanism, 264 ... Lid member, 308 ... Recess, C ... Vehicle body center line, G1 ... Center of gravity of high-voltage battery Location, the center of gravity of the G2 ... motor driver

Claims (10)

Swing arms (12, 214) that are pivotally supported by the body frame and pivotally support the rear wheels (WR), and an electric motor (50) that supplies rotational driving force to the rear wheels (WR). , 250) and a motor driver (35, 216) having a drive circuit of the electric motor (50, 250) in the swing arm (12, 214) in the electric straddle-type vehicle (1, 200),
The electric motor (50, 250) is positioned at one side of the rear wheel (WR) in the vehicle width direction as viewed from the side of the vehicle body and the rotation shaft (53, 278) of the electric motor (50, 250) The rear wheel (WR) axle (19,253) is parallel and offset in the vehicle width direction, and the outer diameter of the electric motor (50,250) and the outer diameter of the rear wheel (WR) overlap. Is located at a position,
The motor driver (35, 216) is disposed at a position in front of the vehicle body of the rear wheel (WR) across the vehicle body center line (C) in the vehicle width direction. Type vehicle.   The motor driver (35, 216) is disposed so that its center of gravity (G2) is offset in a direction opposite to the offset direction with respect to the vehicle center line (C) of the electric motor (50, 250). The electric straddle-type vehicle according to claim 1. The motor driver (216) is disposed on the vehicle rear side of the swing shaft (215) at a position near the swing shaft (215) of the swing arm (214), and the swing arm (214). The electric straddle-type vehicle according to claim 1 or 2, wherein the electric straddle-type vehicle is inserted into a recess (308) opened on an upper surface side of the swing arm and attached to the inside of the swing arm (214). The motor driver (216) has a main body portion (312) and a lid member (264) fixed to the upper portion of the main body portion (312),
At least a switching element (316) for intermittently energizing the motor is supported on the lower surface of the lid member (264).
The electric type according to claim 3, wherein the lid member (264) is exposed to the outside when the motor driver (216) is attached to the swing arm (214). Saddle type vehicle.   The electric scissor according to claim 4, wherein a mounting portion (306) for fixing the motor driver (216) to the swing arm (214) is formed on the lid member (264). Ride type vehicle.   The motor driver (216) has a terminal (269) to which a power harness (258) for supplying electric power to the switching element (316) group and the battery (213) is connected, and is disposed substantially at the center of the vehicle body. Smoothes the power supplied to the coupler unit (268) and the inverter to which the harness (256) of the control system is connected at a position offset in the vehicle width direction and outside the vehicle center line (C) of the electric motor (250). The electric straddle-type vehicle according to claim 4 or 5, wherein a capacitor (323) is provided.   The motor driver (35) is disposed at a position closer to the swing shaft (11) of the swing arm (12) and below the swing shaft (11), and the swing arm (12). The electric straddle-type vehicle according to claim 1, wherein the electric straddle-type vehicle is inserted into an opening provided toward a lower surface of the swing arm and attached to the inside of the swing arm (12).   The electric straddle type according to claim 1 or 2, wherein an electric fan (82) is provided on an upper surface of the swing arm (12) at a position above the motor driver (35). vehicle. A plurality of heat dissipating fins (81) integrally formed on the upper surface of the swing arm (12) and extending above the vehicle body above the motor driver (35);
The electric fan (82) according to claim 8, wherein the electric fan (82) is disposed on an upper portion of the heat radiating fin (81) with a rotating shaft (82a) thereof directed in a vertical direction of the vehicle body. Ride type vehicle. A center stand (18) pivotally supported with respect to the vehicle body frame;
The center stand (18) is configured so as to be in contact with the lower surface of the swing arm (12) under the vehicle body of the motor driver (35) when retracted. The electric straddle-type vehicle according to any one of the above.

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