JP7340432B2 - Electric vehicle drive system - Google Patents

Description

The present invention relates to an electric vehicle drive system.

2. Description of the Related Art Conventionally, electric vehicles have been known that are equipped with an electric vehicle drive system that uses only an electric motor as a driving power source. Among this type of electric vehicle drive system, there is one in which an electric motor, a storage battery that supplies electric power to the electric motor, and a control unit that controls the drive of the electric motor are housed in one housing. An electric motor is directly connected to an axle of an electric vehicle, and the rotation of the electric motor directly corresponds to the rotation of the wheels (for example, see Patent Document 1).

Furthermore, some electric vehicle drive systems have one of the front wheels and the rear wheels as the driving wheels of the electric vehicle, and the other of the front wheels and the rear wheels as the driven wheels. Furthermore, some electric motors employ switched reluctance motors. A speed reducer, a switched reluctance motor, etc. are housed inside the driven wheel. The control section (4WD control unit) drives the switched reluctance motor within a predetermined speed range from the start of the vehicle. On the other hand, when the speed exceeds a predetermined speed, driving of the switched reluctance motor is stopped and the driven wheels are placed in a driven state (see, for example, Patent Document 2).

Japanese Patent Application Publication No. 2012-5245 Japanese Patent Application Publication No. 2004-328991

However, in Patent Document 1 mentioned above, since the storage battery is also housed in the housing, there is a possibility that the degree of freedom in layout of the electric motor, storage battery, and control unit within the vehicle may be reduced. .
In addition, it is difficult to install a single housing on a vehicle that uses an engine as a power source for driving (hereinafter referred to as an engine-driven vehicle), and it is difficult to convert an engine-driven vehicle to an electric vehicle. There was an issue.
Furthermore, even if a problem is found in one component within the casing, the entire casing must be replaced, resulting in poor maintainability.

In the above-mentioned Patent Document 2, since the speed reducer, the switched reluctance motor, etc. are housed in the wheel of the driven wheel, it is necessary to house the speed reducer, the switched reluctance motor, etc. in another location of the vehicle. is difficult. Therefore, there was a problem that the degree of freedom in layout of the speed reducer, switched reluctance motor, etc. was low.

Therefore, the present invention provides an electric vehicle drive system that can increase the degree of freedom in layout within a vehicle and also improve maintainability.

In order to solve the above problems, an electric vehicle drive system according to the present invention includes a drive unit provided individually for each wheel of a vehicle having a plurality of sets of wheels arranged in the vehicle width direction; a storage battery that supplies power to the drive unit, and a control section that controls the drive of the drive unit, the drive unit including an electric motor and a transmission mechanism that transmits rotational force from the electric motor to the wheels via an axle. a mechanism, the motor shaft of the electric motor is disposed at a position shifted from the axle, and each of the transmission mechanisms of each of the drive units provided on the set of wheels The electric motor is arranged near the center in the width direction, and the electric motor is arranged on both sides in the vehicle width direction with the transmission mechanism in between.

In the above configuration, the storage battery may be provided for each drive unit.

In the above configuration, the control section may be provided for each drive unit.

In the above configuration, the electric motor and the control section may be arranged side by side.

In the above configuration, the electric motor may be a switched reluctance motor.

In the above configuration, the maximum DC voltage value of the storage battery may be less than 60V.

The above configuration may further include a display that displays at least one of the remaining capacity of the storage battery and the remaining travel distance of the vehicle derived from the remaining capacity.

The above configuration may include a first operating section that connects and disconnects the storage battery and each of the control sections selectively or all at once.

The above configuration may include a second operation section for individually driving each of the drive units.

The above configuration may further include a third operation section for switching the operation mode of each of the drive units.

The above configuration may include a power supply unit for supplying external power to the storage battery, and a switch circuit that connects and disconnects the power supply unit and the storage battery.

According to the electric vehicle drive system of the present invention, it is possible to increase the degree of freedom in the layout within the vehicle, and also to improve maintainability, and furthermore, it is possible to easily change an engine-driven vehicle to an electric drive.

1 is a schematic diagram of an electric vehicle in an embodiment of the present invention. FIG. 2 is an explanatory diagram of the arrangement structure of the electric vehicle drive system on the front wheel side in the embodiment of the present invention, seen from the side surface in the vehicle width direction of the vehicle body. FIG. 1 is an explanatory diagram of the arrangement structure of the electric vehicle drive system on the front wheel side in the embodiment of the present invention, viewed from the front of the vehicle body. FIG. 1 is an explanatory diagram of a rear wheel-side electric vehicle drive system according to an embodiment of the present invention, seen from a side surface in the vehicle width direction.

Next, embodiments of the present invention will be described based on the drawings.

<Electric vehicle>
FIG. 1 is a schematic diagram of an electric vehicle 1. FIG. In the following description, the front and the rear with respect to the traveling direction of the electric vehicle 1 are simply referred to as the front and the rear. The vehicle width direction of the electric vehicle 1 that is perpendicular to the traveling direction is simply referred to as the vehicle width direction. Further, the vertical direction in a state in which the electric vehicle 1 is arranged so as to be able to run on the road surface F (see FIG. 2) is simply referred to as the vertical direction.
As shown in FIG. 1, the electric vehicle 1 includes a vehicle body 2, a pair of front wheels 3a and 3b located in front of the vehicle body 2 and on both sides in the vehicle width direction, and a pair of front wheels 3a and 3b located at the rear of the vehicle body 3 in the vehicle width direction. The vehicle includes a pair of rear wheels 4a, 4b arranged on both sides, and an electric vehicle drive system 5 that is provided within the vehicle body 2 and independently drives the front wheels 3a, 3b and the rear wheels 4a, 4b, respectively.

The front wheels 3a, 3b and the rear wheels 4a, 4b are wheels with tires (both not shown) mounted thereon. An axle 6 is connected to each wheel. Further, a steering wheel 7 is connected to the front wheels 3a and 3b. An electric vehicle drive system 5 is connected to the axle 6 .

<Electric vehicle drive system>
The electric vehicle drive system 5 includes four drive units 8a, 8b, 9a, 9b (front wheel drive units 8a, 8b, rear wheel drive units 9a, 9b) provided individually for each of the wheels 3a to 4b; A storage battery 12 that supplies power to the drive units 8a to 9b, a control section 13 that performs drive control of each drive unit 8a to 9b, a switch circuit unit 10 connected to each drive unit 8a to 9b, and each drive unit 8a. 9b and a switch circuit unit 10, and a display 18 provided on an instrument panel (not shown) of the vehicle body 2, etc. A storage battery 12 and a control section 13 are provided for each drive unit 8a to 9b.

The basic configuration of each drive unit 8a to 9b is the same. That is, each drive unit 8a to 9b includes an electric motor 14 and a transmission gear (an example of a transmission mechanism in the claims) 15 that transmits the rotational force of the electric motor 14 to an axle.

The electric motor 14 is a so-called switched reluctance motor. A switched reluctance motor is a motor in which both the rotor and the stator are provided with salient poles. In a switched reluctance motor, windings are wound around each of a plurality of salient stator poles provided on the stator, and the salient stator poles are excited by supplying current to the windings. The magnetic attraction force generated in the stator salient poles attracts a plurality of rotor salient poles provided on the rotor to generate rotational force.

The transmission gear 15 includes, for example, two spur gears 16a and 16b that mesh with each other (see FIG. 2). One spur gear 16a of the two spur gears 16a and 16b is connected to a motor shaft (not shown) of the electric motor 14. The other spur gear 16b of the two spur gears 16a and 16b is connected to the axle 6. That is, the motor shaft of the electric motor 14 is not arranged coaxially with the axle 6, but is arranged at a position shifted from the axle 6.
In each of the drive units 8a to 9b configured in this manner, a transmission gear 15 is disposed near the center in the vehicle width direction. The electric motors 14 of each of the drive units 8a to 9b are arranged on both sides in the vehicle width direction with the transmission gear 15 interposed therebetween.

Examples of the storage battery 12 include batteries such as a lithium ion battery, a nickel hydride battery, and a lead battery. The maximum DC voltage value of the storage battery 12 is a safe voltage of less than 60V.

The control unit 13 selectively supplies current from the storage battery 12 to predetermined windings of the electric motor 14 in a predetermined energization pattern. The control unit 13 includes, for example, a three-phase bridge circuit. The three-phase bridge circuit is configured by connecting a circuit including two switching elements (not shown) connected in series in parallel between a high potential side and a ground potential. Each switching element is, for example, a FET (Field Effect Transistor) or an IGBT (Insulated Gate Bipolar Transistor).

Note that the energization pattern is a switching pattern that turns a switching element into an on state or an off state, and refers to a continuously turned on state (“ON”) or a continuously turned off state (“ON”). or a period other than "PWM (Pulse Width Modulation)") or a state controlled to be turned on or off at a constant cycle (PWM controlled state) ("PWM").
The control unit 13 and the storage battery 12 are connected via a switch 17. The switch 17 connects and disconnects the control unit 13 and the storage battery 12.

The switch circuit unit 10 includes a power supply section 19 that can be connected to an external power source (not shown), and a switch circuit 21 that connects and disconnects the power supply section 19 and each storage battery 12 individually. The switch circuit 21 includes four switches 22 depending on the number of storage batteries 12.

The operation section 11 includes a first operation section 23 for operating the switch 17, a second operation section 24 for individually driving each drive unit 8a to 9b, and a second operation section 24 for individually driving each drive unit 8a to 9b. 3 operating section 25 and a fourth operating section 26 for operating the switch circuit 21.

By operating the first operating section 23, each switch 17 is operated, and the control section 13 and the storage battery 12 are connected or disconnected. The first operating section 23 can also individually operate the switches 17 for each of the drive units 8a to 9b. Further, the first operating section 23 can also operate the switches 17 of each of the drive units 8a to 9b at once.

For example, all the drive units 8a to 9b can be driven by connecting all the switches 17 of each of the drive units 8a to 9b. In this case, the electric vehicle 1 becomes four-wheel drive. Further, by connecting the switch 17 of either the front wheel drive units 8a, 8b or the rear wheel drive units 9a, 9b, and shutting off the other switch 17, the front wheel drive units 8a, 8b, or Only either of the rear wheel drive units 9a, 9b can be driven. In this case, the electric vehicle 1 becomes two-wheel drive.

In addition, it is possible to connect only the switch 17 of one of the left and right drive units 8a to 9b among the drive units 8a and 9b, or to connect the switch 17 of only one of the drive units 8a and 9b. It is also possible to do so. By connecting only one of the switches 17 in this way, it becomes possible to smoothly turn right or left when the electric vehicle 1 is running.

The second operating section 24 performs drive control on the drive units 8a to 9b to which the switches 17 are connected by the first operating section 23. Specifically, the rotational speed of a motor shaft (not shown) in the electric motor 14 constituting each drive unit 8a to 9b is controlled. Note that the operation of the first operation section 23 may be linked to the operation of the second operation section 24. In other words, the first operating section 23 may be operated based on the operation of the second operating section 24, thereby connecting or disconnecting the switch 17.

The operation modes of each of the drive units 8a to 9b controlled by the third operation section 25 include, for example, a sports mode, an eco mode, a charge mode, and the like. For example, when the sports mode is selected by the third operation unit 25, the electric motors 14 of the corresponding drive units 8a to 9b are energized in advance, and the energization width (pulse width in PWM control) is increased. When the eco mode is selected using the third operation unit 25, the electric motor 14 of the corresponding drive unit 8a to 9b is energized to a smaller width. When the charge mode is selected by the third operation unit 25, the electric motor 14 of the corresponding drive unit 8a to 9b is subjected to regeneration operation or the time of the regeneration operation is lengthened.

The fourth operation section 26 is used when an external connector (not shown) is connected to the power supply section 19 and each storage battery 12 is charged. The fourth operation unit 26 can operate each switch 22 of the switch circuit 21 individually or collectively. By connecting and disconnecting all the switches 22 at once, there is no need to operate the switch 22 for each storage battery 12. Therefore, when an external connector (not shown) is connected to the power supply unit 19, each storage battery 12 can be charged at the same time. Further, for example, by connecting only the switch 22 corresponding to the storage battery 12 with a small remaining capacity among the four storage batteries 12, it is possible to charge only the desired storage battery 12. The remaining capacity of the storage battery 12 is displayed on the display 18.

In addition to displaying the remaining capacity of the storage battery 12, the display 18 can also display the remaining travel distance of the electric vehicle 1 derived from this remaining capacity. However, the present invention is not limited to this, and it is also possible to display a warning or the like on the display 18. The warning includes, for example, an abnormality in the electric motor 14 in each of the drive units 8a to 9b, a poor connection between various parts, and the like. It is also possible to display the load status of the four drive units 8a to 9b.

When displaying warnings and load conditions on the display 18, each drive unit 8a to 9b is provided with a sensor, etc., and the display 18 displays a result based on an output signal from the sensor. Here, when displaying the load status of each of the drive units 8a to 9b on the display 18, it is preferable that the storage batteries 12 are connected to each other. With this configuration, the operation unit 11 preferentially supplies power to the drive units 8a to 9b with a large load, depending on the load status of the four drive units 8a to 9b.

<Arrangement structure of each part of electric vehicle drive system>
Next, the arrangement structure of each part of the electric vehicle drive system 5 will be explained based on FIGS. 2 to 4.
FIG. 2 is an explanatory diagram of the arrangement structure of the electric vehicle drive system 5 on the front wheels 3a, 3b side, and is a diagram seen from the side of the vehicle body 2 in the vehicle width direction. FIG. 3 is an explanatory diagram of the arrangement structure of the electric vehicle drive system 5 on the front wheels 3a, 3b side, and is a diagram seen from the front of the vehicle body 2. As shown in FIG. FIG. 4 is an explanatory diagram of the arrangement structure of the electric vehicle drive system 5 on the rear wheels 4a, 4b side, and is a diagram seen from the side of the vehicle body 2 in the vehicle width direction.

As shown in FIGS. 1 to 4, in the electric vehicle drive system 5, a transmission gear 15 is arranged near the center in the vehicle width direction, and electric motors 14 are arranged on both sides of the transmission gear 15 in the vehicle width direction. is the same for all drive units 8a to 9b. On the other hand, the arrangement structure of the electric motor 14 and the transmission gear 15 in the vertical and longitudinal directions, and the arrangement structure of the storage battery 12 and the control section 13 are slightly different between the front wheels 3a, 3b side and the rear wheels 4a, 4b side.

As shown in FIGS. 1 to 3, in the front wheel drive units 8a, 8b disposed on the front wheels 3a, 3b side, the electric motor 14 is disposed slightly behind the front wheels 3a, 3b. A motor shaft (not shown) of this electric motor 14 and each axle shaft 6 of the front wheels 3a, 3b are connected via a transmission gear 15. The storage battery 12 arranged on the front wheels 3a, 3b side is arranged ahead of the front wheels 3a, 3b. The control unit 13 disposed on the front wheels 3a, 3b side is disposed above the electric motor 14 and in line with the electric motor 14.

As shown in FIGS. 1 and 4, in the rear wheel drive units 9a, 9b disposed on the rear wheels 4a, 4b side, an electric motor 14 is disposed above the rear wheels 4a, 4b. A motor shaft (not shown) of the electric motor 14 and each axle shaft 6 of the rear wheels 4a, 4b are connected via a transmission gear 15. The control unit 13 disposed on the rear wheels 4a, 4b side is disposed in front of the electric motor 14 and in line with the electric motor 14. The storage battery 12 disposed on the side of the rear wheels 4a, 4b is disposed further forward than the control section 13.

Under such a configuration, the four drive units 8a to 9b are each independently driven to cause the electric vehicle 1 to travel. All of the four drive units 8a to 9b may be driven to drive the vehicle in four-wheel drive mode. Alternatively, any one of the four drive units 8a to 9b may be driven, the driven wheels 3a to 4b may be used as driving wheels, and the other wheels 3a to 4b may be used as driven wheels. For example, the front wheels 3a and 3b may be used as driving wheels, and the rear wheels 4a and 4b may be used as driven wheels, or vice versa.
Further, for example, one of the left and right wheels 3a to 4b may be used as a driving wheel, and the other wheel 3a to 4b may be used as a driven wheel. Even in this case, straight running and turning are possible. Furthermore, it is possible to run using any one, three, or two diagonally located wheels 3a to 4b as driving wheels. Therefore, even if any of the drive units 8a to 9b, the storage battery 12, or the control unit 13 malfunctions, it is possible to provide the electric vehicle 1 that can safely run using the other wheels 3a to 4b as drive wheels. .

The electric motor 14 constituting each drive unit 8a to 9b is a so-called switched reluctance motor. Since the switched reluctance motor does not have a permanent magnet or the like, no cogging torque is generated when the electric motor 14 is not energized. Therefore, even if any of the wheels 3a to 4b of the drive units 8a to 9b is a driven wheel, no unnecessary load is applied to the driven wheel.

As described above, in the electric vehicle drive system 5 described above, drive units 8a to 9b are individually provided for each of the wheels 3a to 4b. Therefore, the degree of freedom in layout of the electric vehicle drive system 5 within the vehicle body 2 can be increased. Since the drive units 8a to 9b are provided separately, if a problem occurs in any of the drive units 8a to 9b, it is possible to perform maintenance only on the drive unit 8a to 9b in which the problem has occurred. Therefore, maintainability can also be improved.

Further, in each of the drive units 8a to 9b, a transmission gear 15 is arranged near the center in the vehicle width direction, and electric motors 14 are arranged on both sides of the transmission gear 15 in the vehicle width direction. Therefore, each of the drive units 8a to 9b can be arranged evenly within the vehicle body 2. Further, for example, even when the electric vehicle drive system 5 is mounted on an engine-driven vehicle, it can be easily assembled. Specifically, it is also possible to cut the axle of an engine-driven vehicle at the center in the width direction of the vehicle, and install each of the drive units 8a to 9b at the cut location. Therefore, it is possible to easily change from an engine-driven vehicle to an electrically driven vehicle.

The electric vehicle drive system 5 includes a storage battery 12 and a control section 13 for each drive unit 8a to 9b. Therefore, the locations of the storage battery 12 and the control section 13 can be determined for each of the drive units 8a to 9b, and the degree of freedom in the layout of the electric vehicle drive system 5 within the vehicle body 2 can be further increased. The drive units 8a to 9b, the storage battery 12, and the control unit 13 can be made into one set, and each set can be incorporated into the electric vehicle 1. Therefore, it is possible to provide an electric vehicle drive system 5 that is easy to incorporate into the electric vehicle 1.

In the electric vehicle drive system 5, an electric motor 14 and a control section 13 are arranged side by side. Therefore, the wiring between the electric motor 14 and the control unit 13 can be made as short as possible. Accordingly, the manufacturing cost of the electric vehicle drive system 5 can be reduced, and noise to the electric vehicle drive system 5 can be reduced.

The electric motor 14 is a so-called switched reluctance motor. Therefore, even if any of the wheels 3a to 4b of the drive units 8a to 9b is used as a driven wheel because no cogging torque is generated when the electric motor 14 is not energized, there is no unnecessary force on this driven wheel. No load is applied. Therefore, for example, a clutch may be provided between the electric motor 14 and the transmission gear 15 or between the transmission gear 15 and the axle 6 to connect the electric motor 14 and the transmission gear 15 when the electric motor 14 is not energized. There is no need to disconnect the transmission gear 15 and the axle 6. Therefore, the configuration of the electric vehicle drive system 5 can be simplified, and the electric vehicle drive system 5 can be downsized.

In the electric vehicle drive system 5, the highest DC voltage value of the storage battery 12 is a safe voltage of less than 60V. Therefore, compared to electric vehicles equipped with high-voltage storage batteries, electrical safety can be improved and maintainability can also be improved.
The display 18 can display the remaining capacity of the storage battery 12 and the remaining travel distance of the electric vehicle 1 derived from this remaining capacity. Therefore, a user-friendly electric vehicle 1 can be provided. Further, when displaying the load status of each drive unit 8a to 9b on the display 18, the operation unit 11 gives priority to the drive unit 8a to 9b with a large load according to the load status of the four drive units 8a to 9b. Power can be supplied.

The electric vehicle drive system 5 includes a first operation section 23 that operates a switch 17 that connects and disconnects the storage battery 12 and the control section 13 . Therefore, the storage battery 12 and the control unit 13 can be connected together or individually, if necessary. Moreover, since the storage battery 12 and the control unit 13 can be instantly shut off in the event of a malfunction in the electric vehicle 1, a highly safe electric vehicle 1 can be provided.
The electric vehicle drive system 5 includes a second operating section 24 for individually driving each of the drive units 8a to 9b. Therefore, the necessary drive units 8a to 9b can be easily driven in consideration of road surface conditions and driving conditions. Therefore, a user-friendly electric vehicle 1 can be provided.

The electric vehicle drive system 5 includes a third operation section 25 that switches the operation mode of each of the drive units 8a to 9b. Therefore, by switching the driving mode of the electric vehicle 1 according to the driver's request, the electric vehicle drive system 5 can be efficiently driven. Furthermore, the driving distance of the electric vehicle 1 can be increased by switching the driving mode according to the remaining capacity and remaining driving distance of each storage battery 12 depending on the road surface condition and driving conditions.

The electric vehicle drive system 5 includes a switch circuit 21 that connects and disconnects the power supply unit 19 and each storage battery 12 individually. Further, a fourth operating section 26 for operating this switch circuit 21 is provided. Therefore, even in the electric vehicle drive system 5 including four storage batteries 12, each storage battery 12 can be charged evenly without the driver being aware of it.

Note that the present invention is not limited to the above-described embodiments, and includes various modifications to the above-described embodiments without departing from the spirit of the present invention.
For example, in the above-described embodiment, the electric vehicle drive system 5 is mounted on the electric vehicle 1, which is a four-wheeled vehicle including a set of front wheels 3a, 3b and a set of rear wheels 4a, 4b. explained. However, the present invention is not limited thereto, and the electric vehicle drive system 5 can be installed in various vehicles having a plurality of sets of wheels arranged in the vehicle width direction. For example, when the electric vehicle drive system 5 is mounted on a six-wheeled vehicle, six drive units 8a to 9b may be provided.

In the above-described embodiment, the transmission gear 15 is composed of, for example, two spur gears 16a and 16b that mesh with each other. However, the present invention is not limited to this, and the transmission gear 15 may have any configuration as long as it can transmit the rotational force of the electric motor 14 to the wheels 3a to 4b (axle shaft 6). For example, the transmission gear 15 may have a structure in which a motor shaft (not shown) of the electric motor 14 and the axle 6 are connected by a belt or chain.

In the above-described embodiment, the arrangement structure of the electric motor 14 and the transmission gear 15 disposed on the front wheels 3a, 3b side in the vertical and longitudinal directions, and the arrangement structure of the storage battery 12 and the control unit 13 have been described. Furthermore, the arrangement structure in the vertical and longitudinal directions of the electric motor 14 and the transmission gear 15 disposed on the rear wheels 4a and 4b side, and the arrangement structure of the storage battery 12 and the control unit 13 have been explained. However, it is sufficient that the transmission gear 15 is disposed near the center in the vehicle width direction, and the electric motors 14 are disposed on both sides of the transmission gear 15 in the vehicle width direction, and other arrangement structures can be arbitrarily determined.

In the above-described embodiment, a case has been described in which the storage battery 12 and the control section 13 are provided for each of the drive units 8a to 9b. However, the present invention is not limited to this, and the storage battery 12 and the control unit 13 may each be combined into one housing.
In the above-described embodiment, a case has been described in which the display 18 can display the remaining capacity of the storage battery 12 and the remaining traveling distance of the electric vehicle 1 derived from this remaining capacity. However, the present invention is not limited to this, and the display 18 may display at least either the remaining capacity of the storage battery 12 or the remaining travel distance of the electric vehicle 1 derived from this remaining capacity.

In the above-described embodiment, a case has been described in which the first operation unit 23 can connect the storage battery 12 and the control unit 13 together or individually as necessary. However, the present invention is not limited to this, and the first operating section 23 may be capable of at least one of connecting and disconnecting the storage battery 12 and the control section 13 selectively or all at once.
In the above embodiment, the electric motor 14 is a so-called switched reluctance motor. However, the present invention is not limited to this, and it is possible to employ various electric motors that generate rotational force when energized.

In the above-described embodiment, a case has been described in which the display 18 displays desired information (remaining capacity of the storage battery 12, remaining travel distance of the electric vehicle 1, load status of each drive unit 8a to 9b, warning, etc.). However, the present invention is not limited thereto, and the display 18 may be configured to transmit desired information to the driver through sound.

DESCRIPTION OF SYMBOLS 1... Electric vehicle, 2... Vehicle body (vehicle), 3a, 3b... Front wheels (wheels), 4a, 4b... Rear wheels (wheels), 5... Electric vehicle drive system, 6... Axle, 8a, 8b... Front wheel drive unit (Drive unit), 9a, 9b...Rear wheel drive unit (drive unit), 12...Storage battery, 13...Control unit, 14...Electric motor, 15...Transmission gear (transmission mechanism), 18...Display unit, 19...Power supply Part, 21... Switch circuit, 23... First operating section, 24... Second operating section, 25... Third operating section

Claims (11)

A drive unit provided individually for each wheel of a vehicle having a plurality of sets of wheels aligned in the vehicle width direction;
a storage battery that supplies power to the drive unit;
a control section that performs drive control of the drive unit;
Equipped with
The drive unit includes:
electric motor and
a transmission mechanism that transmits rotational force from the electric motor to the wheels via an axle ;
Equipped with
A motor shaft of the electric motor is disposed at a position offset from the axle,
Each of the transmission mechanisms of each of the drive units provided on the set of wheels is disposed near the center of the vehicle in the vehicle width direction,
An electric vehicle drive system characterized in that the electric motors are arranged on both sides of the vehicle width direction with the transmission mechanism in between. The electric vehicle drive system according to claim 1, wherein each drive unit includes the storage battery. The electric vehicle drive system according to claim 1 or 2, wherein each drive unit includes the control section. The electric vehicle drive system according to claim 3, wherein the electric motor and the control section are arranged side by side. The electric vehicle drive system according to any one of claims 1 to 4, wherein the electric motor is a switched reluctance motor. The electric vehicle drive system according to any one of claims 1 to 5, wherein the maximum DC voltage value of the storage battery is less than 60V. 7. The vehicle according to claim 1, further comprising a display that displays at least one of the remaining capacity of the storage battery and the remaining mileage of the vehicle derived from the remaining capacity. Electric vehicle drive system. Any one of claims 1 to 7, further comprising a first operation unit that connects and disconnects the storage battery and each of the control units selectively or all at once. The electric vehicle drive system according to item 1. The electric vehicle drive system according to any one of claims 1 to 8, further comprising a second operation section for individually driving each of the drive units. The electric vehicle drive system according to any one of claims 1 to 9, further comprising a third operation section that switches the operation mode of each of the drive units. a power supply unit for supplying external power to the storage battery;
The electric vehicle drive system according to any one of claims 1 to 10, further comprising a switch circuit that connects and disconnects the power supply unit and the storage battery.

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