JP6193735B2 - Saddle riding vehicle - Google Patents

Description

  The present invention relates to a saddle riding type vehicle.

  In a straddle-type vehicle such as an electric motorcycle, driving wheels are driven using the rotational power of a driving source such as an electric motor. In such a straddle-type vehicle, a structure is proposed in which a drive source and a power transmission mechanism that transmits rotational power output from the drive source to the drive wheels are provided in a swing arm that cantilever-supports the rear wheels as drive wheels. (For example, refer to Patent Document 1).

JP-A-5-105141

  However, since the swing arm that cantilever-supports the rear wheel is disposed on one side in the width direction of the vehicle body, the weight balance in the vehicle width direction may deteriorate. In a saddle-ride type vehicle, in order to make the same turn on the left and right, it is necessary to change the force with which the driver tilts the vehicle body on the left and right.

  An object of the present invention is to provide a straddle-type vehicle capable of improving the weight balance in the vehicle width direction and improving operability.

  In order to solve the above problems, a straddle-type vehicle according to an embodiment of the present invention includes a drive wheel, a vehicle body frame provided with a swing shaft extending in the vehicle width direction, and a drive for driving the drive wheel. A power source, a base end portion attached to the vehicle body frame so as to be swingable about the swing shaft, a tip end portion rotatably supporting the drive wheel, and rotational power output from the drive source. A power transmission mechanism that transmits to the drive wheel, the swing arm is disposed symmetrically with respect to a vehicle width direction center line in plan view, and the power transmission mechanism is provided inside the swing arm, At least a part of the power transmission mechanism is arranged symmetrically with respect to the center line in the vehicle width direction in plan view.

  According to the above configuration, at least a part of the power transmission mechanism is disposed symmetrically with respect to the vehicle width direction center line in plan view, and the swing arm incorporating the power transmission mechanism is aligned with the vehicle width direction center line in plan view. Since they are arranged symmetrically, the weight balance in the vehicle width direction is improved and the operability is improved. In particular, in a straddle-type vehicle, the fact that the weight balance in the vehicle width direction is symmetrical is effective in improving operability.

  The drive source may be arranged such that the output shaft is located at the center in the vehicle width direction. Thereby, a power transmission mechanism can be easily arrange | positioned along a vehicle width direction centerline, and the weight balance of a vehicle width direction can be improved.

  The drive wheels may be configured as a pair of left and right drive wheels disposed on the left and right of the swing arm. Thereby, the weight balance of the vehicle width direction of a vehicle can be improved.

  The drive source may be arranged symmetrically with respect to the center line in the vehicle width direction in plan view. Since the drive source is a relatively heavy element among the elements constituting the vehicle, the weight balance in the vehicle width direction of the vehicle can be improved by arranging the drive source symmetrically.

  The drive wheel is provided in a pair of left and right, the drive source is provided in a pair of left and right, the power transmission mechanism is provided in a pair of left and right, and the rotational power output from each of the pair of left and right drive sources is supplied to the pair of left and right drives. It may be configured to transmit to each of the drive wheels. By arranging each configuration between the drive source and the drive wheel symmetrically, the weight balance of the vehicle in the vehicle width direction can be improved.

  The drive source is an electric motor, and the electric motor is supported by the swing arm and configured to be able to swing around the swing shaft together with the swing arm. You may arrange | position so that it may overlap in planar view. Thereby, the moment of inertia generated by swinging of the swing arm can be reduced, and the electric motor can be supported by the swing arm without excessively supporting rigidity of the swing arm.

  The electric motor may be arranged such that a rotation shaft is coaxial with the swing shaft. Thereby, the moment of inertia generated by swinging of the swing arm can be reduced, and the electric motor can be supported by the swing arm without excessively supporting rigidity of the swing arm.

  A straddle-type vehicle according to another aspect of the present invention includes a drive wheel, a vehicle body frame provided with a swing shaft extending in a vehicle width direction, a drive source for driving the drive wheel, and a base end portion of the vehicle A swing arm attached to the vehicle body frame so as to be swingable about a swing shaft and having a tip portion rotatably supporting the drive wheel, and a power transmission for transmitting rotational power output from the drive source to the drive wheel And the drive source is an electric motor, and the electric motor is supported by the swing arm such that a rotation shaft is disposed coaxially with the swing shaft, and the swing motor and the swing arm together with the swing arm. It is configured to be swingable around the moving axis. According to the above configuration, since the rotating shaft of the electric motor is arranged coaxially with the swing axis of the swing arm, the moment of inertia caused by the swing of the swing arm can be reduced, and the support rigidity of the swing arm can be reduced. The electric motor can be supported on the swing arm without excessively increasing the value. Therefore, operability can be improved.

  The above object, other objects, features, and advantages of the present invention will become apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings.

  According to the straddle-type vehicle of the present invention, the weight balance in the vehicle width direction can be improved and the operability can be improved.

FIG. 1 is a right side view of the saddle riding type vehicle according to the first embodiment of the present invention. FIG. 2 is a top view of the saddle riding type vehicle shown in FIG. FIG. 3 is a horizontal sectional view showing a swing arm applied to the saddle riding type vehicle shown in FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. FIG. 5 is a top view of the saddle riding type vehicle according to the second embodiment of the present invention. FIG. 6 is a top view of the saddle riding type vehicle according to the third embodiment of the present invention. FIG. 7 is a side view of the electric motor and swing arm of the saddle riding type vehicle shown in FIG. FIG. 8 is a top view of the saddle riding type vehicle according to the fourth embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout the drawings, and redundant description thereof is omitted unless otherwise specified.

<First Embodiment>
First, a first embodiment of the present invention will be described. In the present embodiment, a saddle-type electric vehicle whose drive source is an electric motor will be described as a saddle-type vehicle. FIG. 1 is a right side view of the saddle riding type vehicle according to the first embodiment of the present invention. As shown in FIG. 1, the saddle riding type vehicle 1 includes a vehicle body frame 3 constituting a vehicle body, a front wheel 4 that is a driven wheel, and a rear wheel 5 that is a driving wheel. The vehicle body frame 3 includes a head frame 6 tilted forward and downward, a pair of left and right upper frames 7 extending rearward from the upper end portion of the head frame 6, and a pair of left and right lower frames 8 extending rearward from the lower end portion of the head frame 6. A front gusset frame 9 that connects the front part of the upper frame 7 and the front part of the lower frame 8 in the vertical direction; and a rear frame 36 that connects the rear part of the upper frame 7 and the rear part of the lower frame 8 in the vertical direction. Have. Each frame 7-9 is formed of a pipe and is fixed to each other by welding.

  The head frame 6 has a pair of upper and lower front support parts 12 and 13 for supporting the front wheel 4. The front wheels 4 are connected to the front end portions of a pair of upper and lower front wheel arms 10 and 11 so as to be rotatable, and the rear end portions of the front wheel arms 10 and 11 extending rearward from the front wheels 4 are connected to the front support portions 12 and 13. Yes. Since the rear end portions of the front wheel arms 10 and 11 are connected to the front support portions 12 and 13 so as to be rotatable around a horizontal axis, the front wheel arms 10 and 11 are connected to the front support portions 12 and 13. On the other hand, it can swing up and down. The front wheels 4 are connected to the lower ends of a pair of left and right handle support members 14 that extend obliquely rearward and upward. A handle grip 15 that protrudes inward in the vehicle width direction is provided at the upper end of the handle support member 14.

  A rear frame 36 is fixed to the rear ends of the upper frame 7 and the lower frame 8 via cross frames 19 and 20. The rear portion of the rear frame 36 is rotatably connected to the base end portion of the swing arm 17 that supports the rear wheel 5. Accordingly, the swing arm 17 is attached to the rear frame 36 so as to be swingable about the swing shaft 50 extending in the vehicle width direction. The swing arm 17 is supported by the rear frame 36 at both ends in the vehicle width direction (both ends in the axial direction of the swing shaft 50). As described above, the rear frame 36 constitutes a part of the vehicle body frame 3 provided with the swing shaft 50 extending in the vehicle width direction.

  The swing arm 17 has a hollow shape. The swing arm 17 is attached with an electric motor 18 which is a driving source for traveling driving. Further, the swing arm 17 accommodates a power transmission mechanism 60 (see FIG. 3) that transmits the rotational power output from the electric motor 18 to the rear wheel 5. By providing the power transmission mechanism 60 in the swing arm 17, the drive system can be made simple and compact. The tip of the swing arm 17 rotatably supports the rear wheel 5 that is a driving wheel.

  A power storage unit 22 for supplying electric power to the electric motor 18 is mounted on the body frame 3 between the front wheels 4 and the rear wheels 5. The power storage unit 22 has a cylindrical shape as a whole and has a cylindrical outer shape. The power storage unit 22 includes a power storage device 24 and an inverter 26 that is electrically connected to the power storage device 24 and disposed behind the power storage device 24. The inverter 26 and the electric motor 18 are connected by three high-voltage electric wires 27 (three-phase alternating current) extending in the front-rear direction.

  The lower frame 8 includes a frame front portion 8a that extends horizontally rearward from the head frame 6, and a frame rear portion 8b that extends rearward from the rear end of the frame front portion 8a and is inclined forward and downward along the power storage unit 22. have. A space is formed below the frame rear portion 8b of the lower frame 8, and a step member 30 for the rider to put his sole on is extended from the vehicle body frame 3 through the space. A dome-shaped cowl 31 that covers the vehicle body frame 3 from above is attached to the vehicle body frame 3. A seat 32 is disposed behind the cowl 31 and above the swing arm 17 for a rider to sit on. The seat 32 is attached to the vehicle body frame 3 by a seat rail (not shown).

  FIG. 2 is a top view of the saddle riding type vehicle shown in FIG. As shown in FIG. 2, the structure of the saddle riding type vehicle 1 is symmetrical. The power storage unit 22 is disposed on a center line (vehicle width direction center line) L0 that passes through the center in the vehicle width direction of the vehicle 1 and extends in the vehicle body front-rear direction in plan view. The axis of the power storage unit 22 overlaps the center line L0 in plan view. The swing arm 17 is disposed at the center of the vehicle body in the vehicle width direction. The swing arm 17 including the electric motor 18 is also disposed on a center line L0 that extends in the longitudinal direction of the vehicle body in plan view.

  In the present embodiment, both the power storage unit 22 and the swing arm 17 are formed symmetrically with respect to the center line L0 in plan view. More specifically, the front wheel 4, the front wheel arms 10 and 11, the power storage unit 22, the electric motor 18, the swing arm 17 (see FIG. 1), and the rear wheel 5 are arranged on a vertical plane extending in the front-rear direction passing through the center in the vehicle width direction. It is formed symmetrically. That is, the rear wheel 5 is configured as a pair of left and right drive wheels disposed on the left and right of the swing arm 17. By arranging and forming these configurations symmetrically, the weight balance in the vehicle width direction of the vehicle 1 can be improved.

  The electric motor 18 is located directly below the seat 32. The power storage unit 22 is covered with a cowl 31 from above. The rear portion 31 b of the cowl 31 is narrower in the vehicle width direction than the front portion 31 a of the cowl 31. In plan view, the frame front portion 8a of the lower frame 8 is covered with the cowl 31, but the frame rear portion 8b of the lower frame 8 protrudes outward in the vehicle width direction from the narrow rear portion 31b of the cowl 31. . The frame rear portion 7 b of the upper frame 7 does not protrude from the cowl 31 in the vehicle width direction.

  FIG. 3 is a horizontal sectional view showing a swing arm applied to the saddle riding type vehicle shown in FIG. As shown in FIG. 3, the power transmission mechanism 60 is disposed symmetrically with respect to the center line L0 in plan view. In addition to this, as described above, the swing arm 17 incorporating the power transmission mechanism 60 is arranged symmetrically with respect to the vehicle width direction center line L0 in plan view. For this reason, the weight balance in the vehicle width direction of the saddle riding type vehicle 1 is improved, and the operability is improved. In particular, in the saddle riding type vehicle 1, it is effective for improving operability that the weight balance in the vehicle width direction is symmetrical.

  Further, the electric motor 18 is disposed so that the output shaft 40 that outputs rotational power to the outside is located at the center in the vehicle width direction. Thereby, the power transmission mechanism 60 can be easily disposed along the center line L0, and the weight balance in the vehicle width direction can be improved. The output shaft 40 of the electric motor 18 coincides with the rotation axis of the rotor (not shown).

  In the electric motor 18, the axis of the output shaft 40 extends in the vehicle width direction. The electric motor 18 is provided in a pair of left and right (two) along the axis of the output shaft 40. The pair of left and right electric motors 18 are arranged to face each other so that the output shafts 40 face each other in the vehicle width direction. As a result, the pair of left and right electric motors 18 constituting the drive source are arranged symmetrically with respect to the center line L0 in plan view. Since the drive source is a relatively heavy element among the elements constituting the vehicle 1, the weight balance in the vehicle width direction of the vehicle 1 can be improved by arranging the drive source symmetrically.

  Corresponding to the pair of left and right electric motors 18 and the pair of left and right drive wheels (rear wheel 5), a pair of left and right power transmission mechanisms 60 are also provided. The pair of left and right power transmission mechanisms 60 are accommodated in one swing arm 17. The pair of left and right power transmission mechanisms 60 are configured to transmit the rotational power output from each of the pair of left and right electric motors 18 to each of the pair of left and right rear wheels 5. By arranging the swing arm 17 along the center of the vehicle 1 in the vehicle width direction, a pair of left and right electric motors 18 attached to the swing arm 17, a pair of left and right power transmission mechanisms 60, and a pair of left and right rear wheels 5 are provided. The weight balance in the vehicle width direction is symmetric with respect to the center line L0 in plan view. This improves operability. In addition, the pair of left and right rear wheels 5 can be independently driven using the pair of left and right electric motors 18 and the pair of left and right power transmission mechanisms 60. For this reason, by performing different output control with the pair of left and right electric motors 18, it is possible to perform different rotational speed control with the pair of left and right rear wheels 5. Therefore, the turning control of the vehicle 1 can be positively performed.

  The electric motor 18 is supported by the swing arm 17. The entire electric motor 18 including the rotor and the stator is configured to be able to swing around the swing shaft 50 together with the swing arm 17. Further, the electric motor 18 is disposed so as to overlap the swing shaft 50 in plan view. In the present embodiment, the electric motor 18 is disposed such that the axis S of the swing shaft 50 of the swing arm 17 passes through the electric motor 18. More specifically, in the electric motor 18, the output shaft 40 that coincides with the rotation axis is coaxial with the swing shaft 50 of the swing arm 17 (that is, the axis of the output shaft 40 matches the axis S of the swing shaft 50). ) Arranged. Thus, the swing shaft 50 passes through the center of gravity of the electric motor 18 in plan view.

  Since the electric motor 18 and the swing shaft 50 overlap in plan view, the moment of inertia generated by the swing of the swing arm 17 can be reduced. Therefore, the electric motor 18 can be supported by the swing arm 17 without excessively supporting rigidity of the swing arm 17. Further, the unsprung weight can be made lighter than arranging the electric motor 18 in the drive wheel (rear wheel 5). Therefore, the motion performance of the vehicle 1 can be improved.

  4 is a cross-sectional view taken along the line IV-IV in FIG. As shown in FIG. 4, the power transmission mechanism 60 is composed of a plurality (three) of gears. More specifically, the power transmission mechanism 60 includes a first gear 61 coaxially fixed to the output shaft 40 of the electric motor 18, a second gear 62 coaxially fixed to the axis T of the rotation shaft of the rear wheel 5, A third gear 63 is provided between the first gear 61 and the second gear 62 and transmits power from the first gear 61 to the second gear 62.

  As described above, by configuring the power transmission mechanism 60 using the plurality of gears 61 to 63, the backlash at the time of speed change or posture change is less than that of chain driving or the like, so that transmission loss can be reduced. In particular, when the electric motor 18 is used as a drive source, the power conversion efficiency can be increased due to the small transmission loss in the configuration in which power is regenerated during deceleration.

  The pair of left and right rear wheels 5 as drive wheels has a pair of left and right wheels 5a each having a hollow portion 5c that extends on the axis T of the rotating shaft and is opened on both sides in the axis T direction. The pair of left and right wheels 5a are pivotally supported on the swing arm 17 via a bearing 64 at the outer peripheral portion on the inner side in the vehicle width direction. Tires 5b are attached to the outer periphery of the pair of left and right wheels 5a on the outer side in the vehicle width direction.

  Second gears 62 are fixed to the inner end surfaces of the pair of left and right wheels 5a in the vehicle width direction, respectively. The second gear 62 and the wheel 5a also form a hollow portion 5c that extends on the axis T of the rotating shaft and is opened on both sides in the axis T direction. Thereby, since air distribute | circulates inside the 2nd gear 62, the temperature rise of the gears 61-63 which comprise the tire 5b and the power transmission mechanism 60 can be suppressed suitably. Further, by forming the hollow second gear 62 as an external gear on the hollow wheel 5a, the wave number of the second gear 62 can be increased. That is, the reduction ratio in the power transmission mechanism 60 can be increased by meshing the second gear 62 and the third gear 63 having a large wave number.

  Further, the electric motor 18 may be configured such that a hollow space that extends on the axis of the rotating shaft and is opened on both sides in the axial direction is formed. In this case, the first gear 61 may also have a hollow portion at the central portion in the radial direction of the rotating shaft. Thereby, the temperature rise of the gears 61-63 which comprise the electric motor 18 and the power transmission mechanism 60 can be suppressed suitably.

  As described above, in the present embodiment, the pair of left and right electric motors 18 and the pair of left and right power transmission mechanisms 60 are disposed symmetrically with respect to the center line L0 of the saddle riding type vehicle 1. Instead of this, a pair of power transmission mechanisms 60 common to the pair of left and right electric motors 18 may be used. Further, in the case of having a pair of left and right power transmission mechanisms 60, at least one of the gears 61 to 63 constituting the pair of left and right power transmission mechanisms 60 is connected and interlocked, or they are cut off from each other and driven left and right independently. May be possible.

Second Embodiment
Next, a second embodiment of the present invention will be described. FIG. 5 is a top view of the saddle riding type vehicle according to the second embodiment of the present invention. In addition, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted. As shown in FIG. 5, the saddle riding type vehicle 101 of the present embodiment is an electric motorcycle. The vehicle 101 includes a front wheel 104 that is a driven wheel and a rear wheel 105 that is a driving wheel.

  Also in this embodiment, the swing shaft 50 at the front end of the swing arm 117 is attached to a vehicle body frame (not shown) below the seat 32. The electric motor 18 as a drive source is supported by the swing arm 117 and is configured to be swingable around the swing shaft 50 together with the swing arm 117.

  In the present embodiment, one electric motor 18 is arranged so that the output shaft 40 faces in the vehicle width direction. Furthermore, the output shaft 40 of the electric motor 18 is located at the center in the vehicle width direction. The axis of the output shaft 40 that matches the rotation axis of the electric motor 18 matches the axis S of the swing shaft 50 of the swing arm 117. Similarly to the first embodiment, the swing arm 117 is disposed symmetrically with respect to the center line L0 in the vehicle width direction in plan view. The power transmission mechanism 160 is housed in the swing arm 117 and is disposed symmetrically with respect to the center line L0 in the vehicle width direction in plan view.

  Also in such a motorcycle, at least a part of the power transmission mechanism 160 is arranged symmetrically with respect to the center line L0 in the vehicle width direction in plan view, and the swing arm 117 in which the power transmission mechanism 160 is built is provided in the vehicle 1. It is arranged at the center in the vehicle width direction. For this reason, the weight balance in the vehicle width direction is improved and the operability is improved.

<Third Embodiment>
Next, a third embodiment of the present invention will be described. FIG. 6 is a top view of the saddle riding type vehicle according to the third embodiment of the present invention. FIG. 7 is a side view of the electric motor and swing arm of the saddle riding type vehicle shown in FIG. In addition, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted. As shown in FIG. 6, the saddle riding type vehicle 201 of the present embodiment is an electric motorcycle. The vehicle 201 includes a front wheel 204 that is a driven wheel and a rear wheel 205 that is a driving wheel.

  Also in this embodiment, the swing shaft 50 at the front end of the swing arm 217 is attached to a vehicle body frame (not shown) below the seat 32. Further, the electric motor 18 as a drive source is supported by the swing arm 217 and is configured to be swingable around the swing shaft 50 together with the swing arm 217.

  In the present embodiment, one electric motor 18 is arranged so that the output shaft 40 faces the vehicle front-rear direction (rear). The electric motor 18 is disposed such that the output shaft 40 is located at the center in the vehicle width direction. Furthermore, the electric motor 18 is arranged symmetrically with respect to the vehicle width direction center line L0 in plan view. Similarly to the first embodiment, the swing arm 217 is arranged symmetrically with respect to the center line L0 in the vehicle width direction in plan view. The power transmission mechanism 260 is accommodated in the swing arm 217, and is disposed symmetrically with respect to the vehicle width direction center line L0 in plan view.

  The electric motor 18 is arranged such that the output shaft 40 does not coincide with the swing shaft 50 of the swing arm 217, but the electric motor 18 is overlapped with the swing shaft 50 in plan view. Even when the axis of the output shaft 40 of the electric motor 18 does not coincide with the axis S of the swing shaft 50 of the swing arm 217, the center of gravity of the electric motor 18 is positioned on the swing shaft 50 of the swing arm 217. The moment of inertia caused by the swing of the swing arm 217 can be reduced, and the electric motor 18 can be supported by the swing arm 217 without excessively supporting rigidity of the swing arm 217.

<Fourth embodiment>
Next, a fourth embodiment of the present invention will be described. FIG. 8 is a top view of the saddle riding type vehicle according to the fourth embodiment of the present invention. In addition, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted. As shown in FIG. 8, the saddle riding type vehicle 301 of the present embodiment is an electric motorcycle. The vehicle 301 includes a front wheel 304 that is a driven wheel and a rear wheel 305 that is a drive wheel.

  In the present embodiment, one electric motor 18 is arranged so that the output shaft 40 faces in the vehicle width direction. Furthermore, the electric motor 18 is located in the center in the vehicle width direction. The axis of the output shaft 40 of the electric motor 18 matches the axis S of the swing shaft 50 of the swing arm 317. The electric motor 18 is supported by the swing arm 317 so that the output shaft 40 coinciding with the rotation shaft is disposed coaxially with the swing shaft 50, and can swing around the swing shaft 50 together with the swing arm 317. Is done.

  The weight balance in the vehicle width direction is improved by positioning the electric motor 18 in the center in the vehicle width direction. Further, since the output shaft 40 of the electric motor 18 is arranged coaxially with the swing shaft 50 of the swing arm 317, the moment of inertia generated by the swing of the swing arm 317 can be reduced, and the operability can be improved. it can.

  From the foregoing description, many modifications and other embodiments of the present invention are obvious to one skilled in the art. Accordingly, the foregoing description is to be construed as illustrative only and is provided for the purpose of teaching those skilled in the art the preferred mode of carrying out the invention. The details of the structure and / or function can be substantially changed without departing from the spirit of the invention. For example, the constituent elements in the plurality of embodiments and the modified examples may be arbitrarily combined.

  Moreover, in the said embodiment, although the case where a drive source was the electric motor 18 was demonstrated, this invention is not limited to this. For example, the drive source may be an engine, or a combination of an engine and an electric motor.

  Moreover, although the case where the driving wheel is the rear wheel has been described in the above embodiment, the present invention can be similarly applied to a configuration in which the front wheel is the driving wheel.

  In the above embodiment, the configuration in which the front wheels 4 are supported by the pair of upper and lower front wheel arms 10 and 11 attached to the vehicle body frame 3 has been described. However, the straddle-type electric vehicle to which the present invention is applied is described here. Not limited. For example, a straddle-type electric vehicle may have a structure in which front wheels are indicated by a front fork supported by a body frame.

  In the first to third embodiments, the configuration in which the entire power transmission mechanisms 60, 160, and 260 are arranged symmetrically with respect to the center line L0 in the width direction in plan view has been described. It suffices that a part thereof is arranged symmetrically with respect to the center line L0 in the width direction in plan view.

  Moreover, in 1st Embodiment, although the structure driven by a some gear as the power transmission mechanism 60 was demonstrated, this invention is not limited to this. For example, it is good also as a structure driven by a belt, a chain, or a shaft, and it is good also as a structure which combined these structures including a gear.

  Further, as described in the first, second, and fourth embodiments, the swing shaft 50 of the swing arms 17, 117, and 317 and the rotation shaft (output shaft 40) of the electric motor 18 are coaxial. Alternatively, as described in the third embodiment, the swing shaft 50 of the swing arm 217 and the rotation shaft of the electric motor 18 may not be coaxial.

  INDUSTRIAL APPLICABILITY The present invention is useful in a saddle riding type vehicle in order to improve the weight balance in the vehicle width direction and improve operability.

1, 101, 201, 301 Saddle-type vehicle 3 Body frame 5, 105, 205, 305 Rear wheel (drive wheel)
17, 117, 217, 317 Swing arm 18 Electric motor (drive source)
36 Rear frame (body frame)
40 Output shaft 50 Oscillating shaft 60, 160, 260, 360 Power transmission mechanism L0 Center line in the vehicle width direction

Claims (7)

Driving wheels,
A vehicle body frame provided with a swing shaft extending in the vehicle width direction;
A drive source for driving the drive wheels;
A swing arm attached to the vehicle body frame so that a base end portion can swing about the swing shaft, and a tip end portion rotatably supporting the drive wheel;
A power transmission mechanism that transmits rotational power output from the drive source to the drive wheels,
The swing arm is arranged symmetrically with respect to the center line in the vehicle width direction in plan view,
The power transmission mechanism is provided inside the swing arm, and at least a part of the power transmission mechanism is arranged symmetrically with respect to a vehicle width direction center line in a plan view ,
The drive wheels are provided in a pair of left and right,
The swing arm, Ru is arranged inside in the vehicle width direction of the pair of left and right driving wheels, a straddle-type vehicle.   The straddle-type vehicle according to claim 1, wherein the drive source is disposed such that an output shaft is positioned at a center portion in a vehicle width direction. The straddle-type vehicle according to claim 1 or 2 , wherein the drive source is disposed symmetrically with respect to a center line in a vehicle width direction in a plan view. Driving wheels,
A vehicle body frame provided with a swing shaft extending in the vehicle width direction;
A drive source for driving the drive wheels;
A swing arm attached to the vehicle body frame so that a base end portion can swing about the swing shaft, and a tip end portion rotatably supporting the drive wheel;
A power transmission mechanism that transmits rotational power output from the drive source to the drive wheels,
The swing arm is arranged symmetrically with respect to the center line in the vehicle width direction in plan view,
The power transmission mechanism is provided inside the swing arm, and at least a part of the power transmission mechanism is arranged symmetrically with respect to a vehicle width direction center line in a plan view,
The drive wheels are provided in a pair of left and right,
A pair of left and right drive sources are provided,
The power transmission mechanism is a straddle-type vehicle provided with a pair of left and right , and configured to transmit rotational power output from each of the pair of left and right drive sources to each of the pair of left and right drive wheels. Driving wheels,
A vehicle body frame provided with a swing shaft extending in the vehicle width direction;
A drive source for driving the drive wheels;
A swing arm attached to the vehicle body frame so that a base end portion can swing about the swing shaft, and a tip end portion rotatably supporting the drive wheel;
A power transmission mechanism that transmits rotational power output from the drive source to the drive wheels,
The swing arm is arranged symmetrically with respect to the center line in the vehicle width direction in plan view,
The power transmission mechanism is provided inside the swing arm, and at least a part of the power transmission mechanism is arranged symmetrically with respect to a vehicle width direction center line in a plan view,
The drive source is an electric motor;
The electric motor is supported by the swing arm and configured to be swingable around the swing shaft together with the swing arm.
The electric motor is a straddle-type vehicle disposed so as to overlap the swing shaft in a plan view. The straddle-type vehicle according to claim 5 , wherein the electric motor has a rotation shaft disposed coaxially with the swing shaft. The drive source is an electric motor;
It said electric motor is supported on the swing arm to the rotary shaft is disposed on the pivot shaft coaxially swingably configured about the oscillation axis together with the swing arm, in claim 1 The saddle riding type vehicle described .

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