WO2019186943A1

WO2019186943A1 - Saddle riding-type electric vehicle

Info

Publication number: WO2019186943A1
Application number: PCT/JP2018/013418
Authority: WO
Inventors: 貴盛白砂; 藤久保　誠; 和弥渥美; 佳寛野村
Original assignee: 本田技研工業株式会社
Priority date: 2018-03-29
Filing date: 2018-03-29
Publication date: 2019-10-03
Also published as: JP6977148B2; CN111902339A; CN111902339B; JPWO2019186943A1

Abstract

This saddle riding-type electric vehicle is provided with a main frame, a motor unit having an electric motor, a battery that supplies power to the motor unit, and a control unit that performs drive control of the motor unit. The main frame includes a pair of left and right portions, and the motor unit is arranged so that at least a portion thereof overlaps the main frame when viewed in a side view of the vehicle, and the motor shaft of the electric motor is positioned lower than a pivot shaft provided on the main frame and is positioned on the rear side in the vehicle front-rear direction.

Description

Straddle-type electric vehicle

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

As a straddle-type electric vehicle using an electric motor as a travel drive source, a straddle-type electric vehicle equipped with a battery that supplies electric power to the electric motor and a control unit that controls electric power supplied from the battery to the electric motor is provided. Known (for example, Patent Document 1).

International Publication No. 2012/066291

In a straddle-type electric vehicle that supplies power from the battery to the electric motor, the cruising distance depends on the capacity of the battery. Therefore, it is desired to secure a space that can accommodate a larger battery.

An object of the present invention is to provide a straddle-type electric vehicle capable of ensuring a larger battery storage space.

According to the present invention,
With front and rear wheels,
A head pipe that supports a steering mechanism for steering the front wheels;
A main frame connected to the head pipe and extending in the vehicle longitudinal direction;
A motor unit having an electric motor that outputs the rotational driving force of the rear wheel;
A battery for supplying power to the motor unit;
A swing arm that is swingably supported by the pivot shaft of the main frame and that rotatably supports the rear wheel;
A straddle-type electric vehicle equipped with
The motor unit and the battery are supported by the main frame between the front wheel and the rear wheel,
The main frame includes a pair of left and right parts,
The motor unit is positioned between the pair of left and right parts when viewed from the top of the vehicle, and is disposed so as to overlap the main frame when viewed from the side of the vehicle;
The motor shaft of the electric motor is disposed above the pivot shaft and rearward in the vehicle front-rear direction.
A straddle-type electric vehicle is provided.

According to the present invention, it is possible to provide a straddle-type electric vehicle capable of ensuring a larger battery storage space.

The left view of the straddle-type electric vehicle which concerns on one Embodiment. FIG. 2 is a cross-sectional view taken along a line II in FIG. 1 and a part of the configuration is omitted. It is a front view of the motor unit concerning one embodiment, and is a figure showing the outline of a motor unit. It is a rear view of the motor unit which concerns on one Embodiment, and is a figure which shows the outline of a motor unit. FIG. 5 is a top view of the motor unit of FIG.

A straddle-type vehicle according to an embodiment of the present invention will be described with reference to the drawings. In each figure, arrows X, Y, and Z indicate directions orthogonal to each other, the X direction is the longitudinal direction of the saddle riding type vehicle, the Y direction is the vehicle width direction (left and right direction) of the saddle riding type vehicle, and the Z direction is the vertical direction. Indicates. Hereinafter, the front or rear in the front-rear direction of the straddle-type vehicle may be simply referred to as front or rear, and the inside or the outside in the vehicle width direction (left-right direction) of the straddle-type vehicle may be simply referred to as inside or outside. Moreover, in what is provided by a pair of right and left, what was demonstrated in either of right and left may not show illustration or description about the other.

<Overview of saddle riding type vehicle>
FIG. 1 is a left side view of a saddle riding type electric vehicle 1 according to an embodiment of the present invention. FIG. 1 is a schematic view mainly showing the main part of the saddle riding type electric vehicle 1. Hereinafter, the saddle riding type electric vehicle 1 may be referred to as a vehicle 1.

The vehicle 1 is a vehicle body frame 10 that includes a head pipe 11 provided at the front of the vehicle, a main frame 12 connected to the head pipe 11 and extending in the front-rear direction, a down frame 13 extending in the front-rear direction below the main frame 12, and a main frame 12 A seat frame 14 extending rearward from the frame 12 is included. The main frame 12 and the down frame 13 are connected to each other at their rear ends.

Please refer to FIG. 2 together with FIG. FIG. 2 is a cross-sectional view taken along the line II of FIG. 1, and a part of the configuration is omitted. In FIG. 2, the configuration of the battery 16, the rear suspension 21, the upper part of the pivot frame 124, and the like are omitted in particular to show the arrangement of the motor unit 30 and the control unit 40. The main frame 12 of the present embodiment includes a main frame 12L extending from the head pipe 11 through the left side of the vehicle 1 and a main frame 12R extending from the head pipe 11 through the right side of the vehicle 1, and these frame portions are It is formed spaced apart in the vehicle width direction (left and right). The

main frames

12L and 12R include a pair of left and right backbone frames 123L and 123R and a pair of left and

right pivot frames

124L and 124R, respectively. Hereinafter, the pair of left and right backbone frames 123L and 123R may be simply referred to as the backbone frame 123, and the pair of left and

right pivot frames

124L and 124R may be simply referred to as the pivot frame 124. (Hereinafter, the same applies to the left and right pairs)
The backbone frame 123 of the present embodiment includes an upper portion 123a extending from the upper part of the head pipe 11 to the rear of the vehicle and a lower portion 123b extending from the lower part of the head pipe 11 to the rear of the vehicle. The upper portion 123a and the lower portion 123b are connected at the rear end portion 126 of the backbone frame 123, and are also connected at an intermediate position. By setting it as such a structure, the rigidity of the main frame 12 can be improved, aiming at weight reduction.

In the present embodiment, the main frame 12 is divided into left and right from the head pipe 11 and extends obliquely rearwardly under the vehicle, and the main frame 12 is formed divided into

main frames

12L and 12R over the entire area. However, a configuration in which a single frame portion extends rearward from the head pipe 11 and then branches to the left and right, or a configuration that does not branch can be employed. In the present embodiment, the backbone frame 123 has an upper part 123a extending from the upper part of the head pipe 11 and a lower part 123b extending from the lower part to the left and right. A configuration extending rearward can also be employed.

The pair of left and

right pivot frames

124L and 124R are formed to extend downward from the rear ends 126 of the backbone frames 123L and 123R, respectively, and are connected to the rear ends of the down frame 13 at the lower ends thereof. The backbone frame 123 and the pivot frame 124 may be formed integrally, or may be formed separately and joined by metallurgical joining such as welding or mechanical joining such as bolt fastening.

The pair of left and right down

frames

13L and 13R are provided to extend in the vehicle front-rear direction below the main frame 12. The

down frames

13L and 13R extend downward from the lower portion of the main frame 12, extend rearward from the lower ends thereof, and are connected to the lower ends of the

pivot frames

124L and 124R, respectively.

In this embodiment, the down frame 13 extends downward from the lower portion of the main frame 12, but a configuration extending downward from the head pipe 11 can also be employed. The down frame 13 is divided into a down frame 13L and a down frame 13R throughout, but is formed so as to extend downward in a single frame from the head pipe 11 or the main frame 12 and then branch left and right. It is also possible to adopt a configuration.

The seat frame 14 is provided so as to extend rearward from the

main frames

12L and 12R, and includes a pair of left and right seat rails 141 that support the seat 4. A pair of left and right support frames 142 connected to the main frame 12 and the pair of left and right seat rails 141 are provided below the pair of left and right seat rails 141.

The head pipe 11 supports a steering mechanism 18 for steering the front wheels FW. The steering mechanism 18 includes a steering stem 181 that is rotatably supported by the head pipe 11, and a top bridge 182 and a bottom bridge 183 are attached to an upper end portion and a lower end portion thereof, respectively. The top bridge 182 is provided with a handle 184 for the driver to steer the front wheels FW. A pair of left and right front forks 185 are supported by the top bridge 182 and the bottom bridge 183. The front fork 185 extends forward obliquely under the vehicle, and a front wheel FW is rotatably supported at the lower end.

The rear swing arm 19 is swingably supported by a pivot shaft 125 provided on the pivot frame 124 at the front end thereof. A rear wheel RW is rotatably supported at the rear end of the rear swing arm 19, and the rear wheel RW is rotationally driven by a chain 23 wound around the drive sprocket 323 of the motor unit 30 and the driven sprocket 22 of the rear wheel RW. The The rear swing arm 19 has a support portion 191 that supports a lower portion of the rear suspension 21 at an upper portion thereof, and swinging of the rear swing arm 19 is attenuated by the rear suspension 21. In the case of the present embodiment, a single rear suspension 21 is supported at the center in the vehicle width direction of the rear swing arm 19, but a pair of left and right rear suspensions 21 are provided at a pair of left and right portions of the rear swing arm 19. A configuration can also be employed.

The lower part of the rear suspension 21 is attached to the lower attachment part 191 and the upper part is attached to the upper attachment part 124 a provided on the pivot 124. The rear suspension 21 is positioned above the motor unit by being attached to the upper attachment portion 124a and the lower attachment portion 191. With such a configuration, the heavy motor unit 30 and the rear suspension 21 can be disposed closer to the center in the vehicle front-rear direction. Therefore, it is possible to make the arrangement of the component parts compact and concentrate the mass.

Referring to FIGS. 3 to 5 together with FIGS. FIG. 3 is a front view of the motor unit 30 and shows an outline of the motor unit 30. FIG. 4 is a top view of the motor unit 30 and shows an outline of the inside. FIG. 5 is a top view of the motor unit 30 and shows an outline of the inside.

The motor unit 30 includes an electric motor 31 that outputs the rotational driving force of the drive sprocket 323. Moreover, the electric motor 31 is accommodated in the motor accommodating part 31a. In the present embodiment, the motor shaft 311 of the electric motor is arranged such that the axial direction of the motor shaft 311 coincides with the vehicle width direction, and the front of the motor unit 30 faces the left side.

Further, the motor unit 30 includes a speed reducing unit 32 that decelerates the rotational driving force of the electric motor 31. The speed reduction part 32 outputs a rotation driving force after being decelerated by the reduction gear 32b, a reduction gear 32b that decelerates the rotation of the case 32a that protrudes outward in the vehicle width direction from the motor housing part 31a, and the motor shaft 311. A shaft 322 is included. In the case of this embodiment, the output shaft 322 is provided forward and upward in the vehicle front-rear direction with respect to the motor shaft 311. A drive sprocket 323 is attached to the output shaft 322 of the speed reduction unit 32.

An oil pan 33 is formed at the bottom of the motor unit 30, and oil stored in the oil pan 33 is sucked and discharged by the oil pump 34 to lubricate and cool the motor unit 30. The oil supplied to each part in the motor unit 30 is returned to the oil pan 33 by natural dripping or the like.

The motor unit 30 has a breather chamber 37 in the upper part thereof for communicating the inside and outside of the motor unit 30 to separate the gas and liquid. Further, the motor unit 30 includes an oil filter 36 and purifies oil circulating in the motor unit 30.

The battery 16 stores electric power supplied to the motor unit 30. The control unit 40 uses the battery 16 as a power source to perform power supply control (drive control) to the motor unit 30, particularly the electric motor 31, according to the driver's accelerator operation or the like. The motor unit 30 and the control unit 40 are connected by an electrical connection member 42, and power is supplied from the control unit 40 to the motor unit 30 via the electrical connection member 42. In this embodiment, although the electric wire is employ | adopted as the electrical connection member 42, the connection member which can transmit a bus bar and other electrical signals is employable. In addition, the motor unit 30 and the control unit 40 generate heat when driven, but are cooled by the heat exchanger 24 and the cooling medium that circulates them, and are prevented from reaching a high temperature.

<Motor unit and control unit layout>
Please refer to FIG. 1 and FIG. In the present embodiment, the housing portion 10 a of the battery 16 is mainly defined by the main frame 12 and the down frame 13. In the case of the present embodiment, the left side of the housing portion 10a in the vehicle width direction is defined by connecting the head pipe 11, the main frame 12L, and the down frame 13L in a loop shape. The main frame 12R and the down frame 13R are defined in a loop shape. Such a frame loop can enhance the protection performance of the side surface of the battery 16. The lower limit in the vertical direction of the housing portion 10 a is defined by the down frame 13, and the upper side is defined by the cover member 17 while being open as the body frame 10.

Further, the battery 16 is disposed between the backbone frames 123L and 123R in a top view of the vehicle, and is supported by the backbone frames 123L and 123R and the down frames 13L and 13R via a fixing structure (not shown). Only the battery 16 is disposed so as to protrude above the backbone frame 123 while being covered with the cover member 17. As for the battery 16, a larger battery can be mounted by projecting upward from the backbone frame 123.

In the present embodiment, the following structure is adopted in order to make the accommodation space of the battery 16 wider in the accommodation portion 10a. That is, in the present embodiment, the motor unit 30 is disposed so as to overlap the main frame 12 in a side view of the vehicle, the motor shaft 311 of the electric motor is below the pivot shaft 125 provided on the pivot frame 124, and the vehicle It is arranged rearward in the front-rear direction. Therefore, since the space between the main frames 12 in the housing portion 10a is used as the arrangement space for the motor unit 30, the remaining space can be used as the battery housing space. Further, since the motor shaft 311 is provided below the pivot shaft 125, the center of gravity of the vehicle 1 can be lowered.

In the case of this embodiment, the control unit 40 is arranged on a virtual vertical line V passing through the rear end of the battery 16. Therefore, since the battery 16 and the control unit 40 can be disposed close to each other, power loss due to wiring or the like can be reduced. In the case of the present embodiment, the motor unit 40 is disposed on an imaginary straight line H drawn backward from the lower end of the battery 16. Thereby, the motor unit 16 is disposed in the lower part of the vehicle 1. Therefore, the center of gravity of the vehicle 1 can be lowered.

Further, in the case of the present embodiment, the motor unit 30 is disposed so as to overlap the pivot frame 124, so that the front portion of the housing portion 10a can be made larger as a housing space for the battery 16. Further, since the motor unit 30 is disposed between the pivot frames, the motor unit 30 can be protected from flying objects such as stepping stones and other disturbances.

Further, in the case of the present embodiment, the motor unit 30 overlaps the pivot frame 124 in a vehicle side view in a front portion in the vehicle front-rear direction. Therefore, since the rear part of the motor unit 30 is disposed outside the housing portion 10a, the space for housing the battery 16 can be increased.

In the present embodiment, the motor unit 30 is disposed such that the front portion thereof overlaps the pivot frame 124 in a side view of the vehicle, but the rear portion thereof is disposed so as to overlap the pivot frame 124. A configuration and a configuration in which the central portion thereof overlaps with the pivot frame 124 can also be adopted. A configuration in which the entire motor unit 30 overlaps the pivot frame 124 can also be employed.

In the present embodiment, the motor unit 30 overlaps the pivot frame 124 in the vehicle side view of the body frame 10, but a configuration overlapping the backbone frame 123 and the pivot frame 124 or a configuration overlapping the pivot frame 124 is also employed. Is possible. In addition, a configuration in which a part of the motor unit 30 overlaps the seat frame 14 in a side view of the vehicle can be employed.

In the case of this embodiment, the motor unit 30 overlaps with the pivot frame 124 in a side view of the vehicle, and overlaps with a pair of left and right parts of the rear swing arm 19. Therefore, since the portion between the rear swing arms 19 can be used as a space for arranging the motor unit 30, more space in the storage portion 10 a can be used as a storage space for the battery 16. In the case of the present embodiment, the pivot shaft 125 is provided at a position where the pivot frame 124 and the motor unit 30 overlap in a side view of the vehicle. Therefore, the pivot shaft 125 is provided across the pivot frame 124 and the motor unit 30 in the vehicle width direction.

In the case of this embodiment, the motor unit 30 has the motor shaft 311 disposed behind the pivot shaft 125 and the output shaft 322 disposed forward of the pivot shaft 125. That is, the pivot shaft 125 is provided between the motor shaft 311 and the output shaft 322 in the vehicle longitudinal direction. Further, the axle of the rear wheel RW, the pivot shaft 125 and the output at the position when the driver is in the vehicle 1 and stops and stands upright (without applying acceleration / deceleration force to the vehicle body). The shafts 322 are arranged on the same straight line (on the straight line L in FIG. 1). By arranging these in the same straight line, power transmission efficiency can be improved.

Further, the motor unit 30 is arranged so that the oil pan 33 protrudes downward from the pivot frame 124 in a side view of the vehicle. Therefore, traveling wind or the like easily hits the oil pan 33, and the oil cooling efficiency can be improved. Further, in the present embodiment, the lower end of the oil pan 33 is located above the lower end of the down frame 13, but may be disposed so as to protrude downward from the lower end of the down frame 13. Since the lower end of the oil pan 33 protrudes below the lower end of the down frame 13, it becomes easier to hit the traveling wind, and the oil cooling efficiency can be further improved.

Further, the control unit 40 is disposed in front of the motor unit 30 in the vehicle front-rear direction and in proximity to the motor unit 30. Since the motor unit 30 and the control unit 40 are disposed close to each other, the electrical connection member 42 that connects them can be shortened. In the case of the present embodiment, the control unit 40 is positioned between the motor unit 30 and the heat exchanger 24 in the front-rear direction and is disposed below the accommodating portion 10a in the vertical direction. The control unit 40 has a box shape and is disposed so as to be thin in the vertical direction. Since the control unit 40 is arranged so as to be thin in the vertical direction, the upper portion thereof can be made larger as a storage space for the battery 16.

The control unit 40 is fixed to the down frame 13 via a fixing structure (not shown). Since the control unit 40 is fixed to the down frame 13 having high rigidity, the support rigidity of the control unit 40 can be increased. In the case of the present embodiment, the control unit 40 is partially overlapped with the down frame 13 in a side view of the vehicle, but may be disposed above the down frame 13 and close to the down frame 13. Good.

In addition, a resolver 35 that detects the rotation angle of the electric motor 31 is provided inside the motor unit 30. Further, the surface facing the front side of the motor unit 30 and the surface facing the rear side of the control unit 40 are connected by a wire harness 352 capable of transmitting an electrical signal. An electrical signal based on the detection result of the resolver 35 is transmitted from the motor unit 30 to the control unit 40 via the wire harness 352.

Further, the motor unit 30 is disposed between the seat rails 141 in a vehicle top view. Since the motor unit 30 is disposed between the seat rails 141 when viewed from the top of the vehicle, interference between the motor unit 30 and the occupant's legs can be prevented when the occupant grips with the legs.

Next, the mounting structure of the motor unit 30 will be described. The motor unit 30 is supported by a mounting portion 133 provided on the main frame 12 and mounting

portions

128 and 129 of motor support portions 127 </ b> L and 127 </ b> R formed below the pivot frame 124. That is, the motor unit 30 is supported by the main frame 12 at three locations, that is, the front mounting portion 128, the rear mounting portion 129, and the mounting portion 133. Since the motor unit 30 is supported at three points of the vehicle body main frame 12 having high support rigidity, the support rigidity can be increased. Further, since the surface of the motor unit 30 facing the vehicle width direction is surrounded by the pivot frame 124, the protection performance of the motor unit 30 can be improved. Further, since the lower portion of the motor unit 30 is supported by the front mounting portion 128 and the rear mounting portion 129 of the motor support portion 127, the load of the motor unit 30 can be uniformly received at two points on the lower portion. Can be suppressed.

In the case of the present embodiment, all three points of the

attachment portions

133, 128, and 129 are formed on the pivot frame 124, but a configuration provided on the backbone frame 123 or the seat frame 14 can also be adopted. Further, the attachment portion 133 may be provided on a bracket or the like extending from the backbone frame 123 or the seat frame 14 toward the motor unit.

In the case of this embodiment, the motor unit 30 has through

holes

301, 302, and 303 at positions corresponding to the mounting

portions

128, 129, and 133. A fixing member 501 can be attached to the front attachment portion 128 so as to cross the pivot frame 124 in the vehicle width direction. The motor unit 30 is fixed to the pivot frame 124 by attaching the fixing member 501 to the front attachment portion 128 in a state of passing through the through hole 301. Similarly, the motor unit 30 is fixed to the pivot frame 124 by attaching the fixing member 502 to the attachment portion 129 in a state of passing through the through hole 302. Furthermore, with the same configuration, the motor unit 30 is fixed to the pivot frame 124 by attaching the fixing member 503 to the attachment portion 133 in a state of passing through the through hole 303.

As a mode in which the motor unit 30 is fixed to the vehicle body frame 10, various mounting structures can be employed in addition to the above configuration, for example, fixing to a pair of left and right parts of each frame by bolt fastening or the like. .

Further, the control unit 40 is sandwiched by the down frame 13 through a fixing structure (not shown) at a portion overlapping the down frame 13 in a side view of the vehicle. Therefore, the control unit 40 can be arranged biased toward the lower end portion of the housing portion 10a, and the space for housing the battery 16 can be increased on the upper side. Further, since the control unit 40 is sandwiched between the down frames 13 having high rigidity, the mounting rigidity of the control unit 40 can be improved.

Next, the configuration of the cooling circuit of the present embodiment will be described with reference to FIGS. The heat exchanger 24 according to the present embodiment is a radiator, and the cooling medium is cooling water (coolant).

The cooling medium cooled by the heat exchanger 24 circulates through the first tubular member 251 to the motor unit. Here, the first tubular member 251 extends downward along the down frame 13 from the heat exchanger 24 and then extends rearward to connect to the motor unit 30. A water jacket (not shown) is formed on the back surface of the motor unit 30 (the surface opposite to the surface on which the speed reduction portion 32 and the like are provided), and the motor unit 30 is cooled when the cooling medium passes through the water jacket. . The cooling medium that has passed through the water jacket is circulated to the heat exchanger 24 through the inside of the second tubular member 252. Here, the second tubular member 252 extends forward along the down frame 13 from the motor unit 30, extends upward after passing through the side of the control unit 40, and is connected to the heat exchanger 24. That is, the circulation path 25 includes the first tubular member 251, the motor unit 30, and the second tubular member 252, and the cooling medium passes through the circulation path 25 in the order of the heat exchanger 24, the motor unit 30, and the heat exchanger 24. Circulate. Further, the cooling medium cools in the order of the motor unit 30 and the control unit 40 when circulating through the circulation path.

In the present embodiment, the first tubular member 251 and the second tubular member 252 employ flexible hoses, but, for example, a pipe-shaped metal member or the like can also be employed. In the present embodiment, the heat exchanger 24 is a radiator, but an oil cooler can also be used. When the oil cooler is employed, the first tubular member 251 and the second tubular member 252 are connected to the inside of the motor unit 30, and oil as a cooling medium can also serve as lubrication inside the motor unit 30.
<Summary of Embodiment>
The said embodiment discloses at least the following vehicles.

1. The straddle-type electric vehicle of the above embodiment includes a front wheel (e.g. FW) and a rear wheel (e.g. RW),
A head pipe (for example, 11) that supports a steering mechanism that steers the front wheels;
A main frame (for example, 12) connected to the head pipe and extending in the vehicle longitudinal direction;
A motor unit (e.g., 30) having an electric motor that outputs the rotational driving force of the rear wheel;
A battery for supplying power to the motor unit (for example, 16),
A swing arm (e.g., 19) that is swingably supported on a pivot shaft (e.g., 125) provided on the main frame, and that rotatably supports the rear wheel;
A straddle-type electric vehicle (for example, 1),
The motor unit and the battery are supported by the main frame between the front wheel and the rear wheel,
The main frame includes a pair of left and right parts (e.g., 12L, 12R),
The motor unit is positioned between the pair of left and right parts when viewed from the top of the vehicle, and is disposed so as to overlap the main frame when viewed from the side of the vehicle;
A motor shaft (for example, 311) of the electric motor is disposed below the pivot shaft and rearward in the vehicle front-rear direction.

According to this embodiment, since the motor unit is arranged between the main frames, a larger battery storage space can be obtained. Therefore, it is possible to provide a straddle-type electric vehicle that can secure a larger battery storage space. Further, since the motor shaft is disposed below the pivot shaft, the center of gravity of the vehicle can be lowered.

2. In the straddle-type electric vehicle according to the above-described embodiment, the motor shaft is disposed below the swing arm in a state where the driver gets on and stops and stands upright.

According to this embodiment, since the motor shaft that is long in the vehicle width direction is disposed offset downward from the swing arm, the motor shaft and the swing arm can be disposed without overlapping in a vehicle side view, It can suppress that a swing arm becomes large in a vehicle width direction.

3. In the straddle-type electric vehicle according to the above embodiment, the pair of left and right parts (for example, 12L and 12R) includes a pair of left and right backbone frames (for example, 123L and 123R) extending in the vehicle front-rear direction and a rear end portion of the backbone frame. A pair of left and right pivot frames (e.g., 124L, 124R) extending in the vertical direction,
A motor support (e.g., 127L, 127R) is formed at the bottom of the pivot frame,
The motor support portion has attachment portions (for example, 128, 129) for attaching the motor unit to the front side and the rear side in the vehicle longitudinal direction,
The motor unit is supported by the mounting portion on the front side and the rear side of the motor unit, respectively.

According to this embodiment, since the motor unit is supported at two points in the lower part of the pivot frame, the load of the motor unit can be received uniformly at two points of the motor support portion. Further, since the motor unit is supported by the lower part of the pivot frame, the center of gravity of the vehicle can be lowered.

4). The straddle-type electric vehicle of the above embodiment further includes a control unit (for example, 40) that performs drive control of the motor unit,
The motor unit includes an output shaft (for example, 311) that outputs the rotational driving force of the electric motor, and a drive sprocket (for example, 323) connected to the output shaft,
The drive sprocket is provided in front of the pivot frame in the vehicle longitudinal direction,
The control unit is disposed below the drive sprocket,
The straddle-type electric vehicle according to claim 3.

According to this embodiment, the control unit is disposed below the drive sprocket provided in front of the pivot frame while ensuring a distance between the rear wheel and the drive sprocket. Therefore, the control unit can be disposed in the vicinity of the motor unit, and the connecting member that connects the motor unit and the control unit can be configured to be short.

5. In the straddle-type electric vehicle of the above embodiment, an oil pan (for example, 33) is provided at the lower part of the motor unit,
The oil pan is provided to protrude below the main frame.

According to this embodiment, since the oil pan is provided so as to protrude rearward of the main frame, the oil cooling efficiency can be improved.

6). In the straddle-type electric vehicle of the above embodiment, the swing arm is configured with a lower mounting portion (for example, 191) to which a lower portion of a rear suspension (for example, 21) is mounted,
The main frame includes an upper mounting portion (for example, 124a) to which the upper portion of the rear suspension is mounted.
The rear suspension is disposed above the motor unit in a side view of the vehicle body.

According to this embodiment, since the rear suspension is disposed above the motor unit in a side view of the vehicle, these components that are heavy objects can be disposed closer to the center in the vehicle front-rear direction. Accordingly, it is possible to achieve compactness and mass concentration.

7. In the saddle riding type electric vehicle of the above embodiment, the control unit is arranged on a virtual vertical line (for example, V) passing through the rear end of the battery.

According to this embodiment, since the battery and the control unit can be arranged close to each other, power loss due to wiring or the like can be reduced.

8. In the straddle-type electric vehicle according to the above-described embodiment, the motor unit is arranged on a virtual straight line (for example, H) drawn backward from the lower end of the battery.

According to this embodiment, since the motor unit is arranged on the virtual straight line drawn backward from the lower end of the battery, the motor unit is arranged at the lower part of the vehicle. Therefore, the center of gravity of the vehicle can be lowered.

1 saddle riding type vehicle, 16 battery, 30 motor unit, 40 control unit

Claims

With front and rear wheels,
A head pipe that supports a steering mechanism for steering the front wheels;
A main frame connected to the head pipe and extending in the vehicle longitudinal direction;
A motor unit having an electric motor that outputs the rotational driving force of the rear wheel;
A battery for supplying power to the motor unit;
A swing arm that is swingably supported on a pivot shaft provided on the main frame and rotatably supports the rear wheel;
A straddle-type electric vehicle equipped with
The motor unit and the battery are supported by the main frame between the front wheel and the rear wheel,
The main frame includes a pair of left and right parts,
The motor unit is positioned between the pair of left and right parts when viewed from the top of the vehicle, and is disposed so as to overlap the main frame when viewed from the side of the vehicle;
The motor shaft of the electric motor is disposed below the pivot shaft and rearward in the vehicle front-rear direction.
A straddle-type electric vehicle characterized by that.
The straddle-type electric vehicle according to claim 1, wherein the motor shaft is disposed below the swing arm in a state where the driver gets on, stops, and stands upright.
The pair of left and right parts includes a pair of left and right backbone frames extending in the vehicle longitudinal direction, and a pair of left and right pivot frames extending in the vertical direction from a rear end portion of the backbone frame,
A motor support is formed at the bottom of the pivot frame,
The motor support part has attachment parts for attaching the motor unit to the front side and the rear side in the vehicle longitudinal direction,
The motor unit is supported by the mounting portion on the front side and the rear side of the motor unit,
The straddle-type electric vehicle according to any one of claims 1 and 2.
A control unit that performs drive control of the motor unit;
The motor unit includes an output shaft that outputs a rotational driving force of the electric motor, and a drive sprocket connected to the output shaft,
The drive sprocket is provided in front of the pivot frame in the vehicle longitudinal direction,
The control unit is disposed below the drive sprocket,
The straddle-type electric vehicle according to claim 3.
An oil pan is provided at the bottom of the motor unit,
The oil pan is provided to protrude below the main frame,
The straddle-type electric vehicle according to any one of claims 3 and 4.
The swing arm is configured with a lower mounting portion to which a lower portion of the rear suspension is mounted,
The main frame is configured with an upper mounting portion to which the upper part of the rear suspension is mounted,
The rear suspension is disposed above the motor unit in a side view of the vehicle body,
The straddle-type electric vehicle according to claim 1.
The straddle-type electric vehicle according to claim 4, wherein the control unit is disposed on a virtual vertical line passing through a rear end of the battery.
The straddle-type electric vehicle according to claim 1, wherein the motor unit is arranged on a virtual straight line drawn backward from the lower end of the battery.