Self-propelled electric vehicle and electric motor unit

Abstract

To provide a self-propelled electric vehicle and an electric motor unit which are not likely to receive the adverse effect of vibration from a main frame that supports a front wheel and a rear wheel, and which facilitate the rigidity or durability of a coolant passage to be secured.SOLUTION: A self-propelled electric vehicle 100 has an electric motor unit 120 attached to a frame 101 that supports a front wheel 103 and a rear wheel 108. The electric motor unit 120 includes, for an electric motor 121, a radiator 130, a liquid feed pump 135, a cooling water tank 138 and an electric fan 139. The radiator 130 and the electric fan 139 are indirectly attached to the electric motor 121 via an indirect support body 134. The liquid feed pump 135 is indirectly attached to the radiator 130 via an indirect support body 137. The cooling water tank 138 is directly attached to the electric motor 121. The electric motor unit 120 has the electric motor 121 directly attached to the frame 101.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a self-propelled electric vehicle that is self-propelled using an electric motor as a drive source, and to an electric motor unit. [Background technology]

[0002] Conventionally, self-propelled electric vehicles such as motorcycles that are driven by sitting on the seat with both feet together or sitting astride the seat have been provided with a cooling device to cool the electric motor. For example, Patent Document 1 listed below discloses a self-propelled two-wheeled electric vehicle in which a condenser for cooling the electric motor is provided directly on the body frame or via a transmission case extending from the body frame. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 4-224490

[0004] However, in the self-propelled two-wheeled electric vehicle described in Patent Document 1, the condenser is attached directly to the vehicle frame or via a bracket attached to the hollow transmission case, which makes it susceptible to the vibrations of the vehicle frame when the vehicle is in motion. In addition, the condenser and the electric motor vibrate independently of each other, making it difficult to ensure the rigidity or durability of the refrigerant path connecting them.

[0005] The present invention has been made to address the above-mentioned problems, and its purpose is to provide a self-propelled electric vehicle and electric motor unit that are less susceptible to the effects of vibrations from the frame supporting the front and rear wheels, and that makes it easier to ensure the rigidity and durability of the refrigerant path. Summary of the Invention

[0006] To achieve the above object, the present invention is characterized by comprising a seat on which a driver sits, a handlebar provided opposite the seat for steering at least one of front and rear wheels, an electric motor disposed closer to the seat than the handlebar for rotating and driving at least one of the front and rear wheels, a cooling device for cooling the electric motor, and a frame extending between the front and rear wheels and supporting the front and rear wheels. a control device for controlling the operation of the electric motor; A self-propelled electric vehicle comprising: an electric motor directly or indirectly attached to and supported by a frame; the control device is located adjacent to the motor or in a common housing with the motor; The cooling device is composed of a fan that blows air in a direction that the motor faces downwind or upwind, and is attached and supported directly or indirectly to the motor. Generates airflow for the motor and control unit The reason is that.

[0007] According to the features of the present invention configured as described above, the self-propelled electric vehicle has an electric motor directly or indirectly attached to and supported by the frame, and a cooling device directly or indirectly attached to and supported by the electric motor. This reduces the influence of vibrations from the frame and facilitates ensuring the rigidity and durability of the refrigerant path. Here, "directly attaching the cooling device to the electric motor" means attaching the cooling device directly to the electric motor, for example, via a mounting portion integral with the electric motor housing or in contact with the housing. Furthermore, "indirectly attaching the cooling device to the electric motor" means attaching the cooling device via a separate component so as not to directly contact the electric motor. Furthermore, support of the cooling device by the electric motor does not mean auxiliary support, but rather support in a state in which the cooling device can fully function with the sole support of the electric motor. Self-propelled electric vehicles include two-wheeled and three-wheeled motorcycles as well as four-wheeled carts and buggies. In this case, a relatively small self-propelled vehicle in which the electric motor is located between the handlebars and the seat is preferred.

[0008] Furthermore, according to the features of the present invention, in a self-propelled electric vehicle, the blower that blows air is directly or indirectly attached to and supported on the electric motor with the blower facing either upwind or downwind of the electric motor, thereby improving the cooling effect of the electric motor. Furthermore, the self-propelled electric vehicle can be made less susceptible to the effects of vibrations from the frame of the blower, and it is easy to ensure the rigidity and durability of the refrigerant path. Furthermore, according to a feature of the present invention, in the self-propelled electric vehicle, the control device that controls the operation of the electric motor is located adjacent to the electric motor or in a housing shared with the electric motor, so that the control device can be efficiently cooled together with the electric motor by the cooling device.

[0009] In order to achieve the above object, the present invention is characterized by a self-propelled electric vehicle including a seat for a driver to sit in, a handlebar provided opposite the seat for steering at least one of the front wheels and the rear wheels, an electric motor arranged closer to the seat than the handlebar for driving at least one of the front wheels and the rear wheels to rotate, a cooling device for cooling the electric motor, and a frame extending between the front wheels and the rear wheels to support the front wheels and the rear wheels, wherein the electric motor is directly or indirectly attached and supported by the frame, the cooling device is directly or indirectly attached and supported by the electric motor, and the cooling device has a radiator for exchanging heat with cooling water for water-cooling the electric motor, a liquid feed pump for circulating the cooling water between the electric motor and the radiator, and a blower for blowing out air, the radiator is directly or indirectly attached and supported by the electric motor, and the blower is directly or indirectly attached and supported by at least one of the electric motor, the radiator, and the liquid feed pump with the electric motor facing either upwind or downwind. and is located between the motor and the radiator. The reason is that there are

[0010] According to the features of the present invention configured as described above, the self-propelled electric vehicle has an electric motor directly or indirectly attached to and supported by the frame, and a cooling device directly or indirectly attached to and supported by the electric motor. This reduces the influence of vibrations from the frame and facilitates ensuring the rigidity and durability of the refrigerant path. Here, "directly attaching the cooling device to the electric motor" means attaching the cooling device directly to the electric motor, for example, via a mounting portion integral with the electric motor housing or in contact with the housing. Furthermore, "indirectly attaching the cooling device to the electric motor" means attaching the cooling device via a separate component so as not to directly contact the electric motor. Furthermore, support of the cooling device by the electric motor does not mean auxiliary support, but rather support in a state in which the cooling device can fully function with the sole support of the electric motor. Self-propelled electric vehicles include two-wheeled and three-wheeled motorcycles as well as four-wheeled carts and buggies. In this case, a relatively small self-propelled vehicle in which the electric motor is located between the handlebars and the seat is preferred. According to another feature of the present invention, the cooling device of the self-propelled electric vehicle includes a radiator and a liquid feed pump, and the radiator is directly or indirectly attached to and supported by the electric motor, thereby reducing the radiator's resistance to vibrations from the frame and making it easier to ensure the rigidity and durability of the refrigerant path. According to another feature of the present invention, the self-propelled electric vehicle is equipped with a blower that blows air and is directly or indirectly attached to and supported by at least one of the electric motor, the radiator, and the liquid feed pump, oriented to face either downwind or upwind of the electric motor, thereby enhancing the cooling effect of the electric motor. According to another feature of the present invention, the self-propelled electric vehicle is equipped with a blower that blows air and is oriented to face either upwind or downwind of the electric motor, thereby making it easier to ensure the rigidity and durability of the refrigerant path. According to another feature of the present invention, the self-propelled electric vehicle is equipped with a blower that is located between the electric motor and the radiator, thereby making it easier to effectively cool the electric motor and the radiator simultaneously.

[0011] To achieve the above object, the present invention is characterized by comprising a seat on which a driver sits, a handlebar provided opposite the seat for steering at least one of front and rear wheels, an electric motor disposed closer to the seat than the handlebar for rotating and driving at least one of the front and rear wheels, a cooling device for cooling the electric motor, and a frame extending between the front and rear wheels and supporting the front and rear wheels. a control device for controlling the operation of the motor; A self-propelled electric vehicle comprising: an electric motor directly or indirectly attached to and supported by a frame; the control device is located adjacent to the motor or in a common housing with the motor;The cooling device is attached to and supported directly or indirectly by the electric motor, and has a radiator that exchanges heat with cooling water for water-cooling the electric motor, a liquid feed pump that circulates the cooling water between the electric motor and the radiator, and a blower that blows out air. The radiator is attached to and supported directly or indirectly by the electric motor, and the blower is attached to and supported directly or indirectly by at least one of the electric motor, the radiator, and the liquid feed pump, with the electric motor facing either downwind or upwind. Air flows are generated for the motor and the control device. The reason is that...

[0012] According to the features of the present invention configured as described above, the self-propelled electric vehicle has an electric motor directly or indirectly attached to and supported by the frame, and a cooling device directly or indirectly attached to and supported by the electric motor. This reduces the influence of vibrations from the frame and facilitates ensuring the rigidity and durability of the refrigerant path. Here, "directly attaching the cooling device to the electric motor" means attaching the cooling device directly to the electric motor, for example, via a mounting portion integral with the electric motor housing or in contact with the housing. Furthermore, "indirectly attaching the cooling device to the electric motor" means attaching the cooling device via a separate component so as not to directly contact the electric motor. Furthermore, support of the cooling device by the electric motor does not mean auxiliary support, but rather support in a state in which the cooling device can fully function with the sole support of the electric motor. Self-propelled electric vehicles include two-wheeled and three-wheeled motorcycles as well as four-wheeled carts and buggies. In this case, a relatively small self-propelled vehicle in which the electric motor is located between the handlebars and the seat is preferred. According to another feature of the present invention, the cooling device of the self-propelled electric vehicle includes a radiator and a liquid feed pump, and the radiator is directly or indirectly attached to and supported by the electric motor. This reduces the influence of vibrations on the radiator from the frame, and makes it easier to ensure the rigidity and durability of the refrigerant path. According to another feature of the present invention, the self-propelled electric vehicle is supported by a blower that blows air, directly or indirectly attached to at least one of the electric motor, the radiator, and the liquid feed pump, oriented to face either downwind or upwind of the electric motor, thereby enhancing the cooling effect of the electric motor. According to another feature of the present invention, the self-propelled electric vehicle is less likely to be affected by vibrations on the blower from the frame, and makes it easier to ensure the rigidity and durability of the refrigerant path. According to another feature of the present invention, the self-propelled electric vehicle has a control device that controls the operation of the electric motor located adjacent to the electric motor or in a housing shared with the electric motor, allowing the cooling device to efficiently cool both the electric motor and the control device.

[0013] To achieve the above object, the present invention is characterized by comprising a seat on which a driver sits, a handlebar provided opposite the seat for steering at least one of front and rear wheels, an electric motor disposed closer to the seat than the handlebar for rotating and driving at least one of the front and rear wheels, a cooling device for cooling the electric motor, and a frame extending between the front and rear wheels and supporting the front and rear wheels. a flat step floor between the steering wheel and the seat on which the driver can place both feet together; The electric motor is directly or indirectly attached to and supported by the frame, and the cooling device is directly or indirectly attached to and supported by the electric motor, and has a radiator that exchanges heat with cooling water for water-cooling the electric motor, a liquid pump that circulates the cooling water between the electric motor and the radiator, and a blower that blows out air, and the radiator is directly or indirectly attached to and supported by the electric motor. It is located above the step floor and faces the step floor. The blower is directly or indirectly attached to and supported by at least one of the electric motor, the radiator, and the liquid pump, with the electric motor facing downwind or upwind.

[0014] According to the features of the present invention configured as described above, the self-propelled electric vehicle has an electric motor directly or indirectly attached to and supported by the frame, and a cooling device directly or indirectly attached to and supported by the electric motor. This reduces the influence of vibrations from the frame and facilitates ensuring the rigidity and durability of the refrigerant path. Here, "directly attaching the cooling device to the electric motor" means attaching the cooling device directly to the electric motor, for example, via a mounting portion integral with the electric motor housing or in contact with the housing. Furthermore, "indirectly attaching the cooling device to the electric motor" means attaching the cooling device via a separate component so as not to directly contact the electric motor. Furthermore, support of the cooling device by the electric motor does not mean auxiliary support, but rather support in a state in which the cooling device can fully function with the sole support of the electric motor. Self-propelled electric vehicles include two-wheeled and three-wheeled motorcycles as well as four-wheeled carts and buggies. In this case, a relatively small self-propelled vehicle in which the electric motor is located between the handlebars and the seat is preferred. According to another feature of the present invention, the cooling device of the self-propelled electric vehicle includes a radiator and a liquid feed pump. The radiator is directly or indirectly attached to and supported by the electric motor, which reduces the influence of vibrations on the radiator from the frame and makes it easier to ensure the rigidity and durability of the refrigerant path. According to another feature of the present invention, the self-propelled electric vehicle is attached directly or indirectly to and supported by at least one of the electric motor, the radiator, and the liquid feed pump, with the blower blowing air facing either the downwind side or the upwind side of the electric motor, thereby improving the cooling effect of the electric motor. According to another feature of the present invention, the self-propelled electric vehicle is less likely to be affected by vibrations on the blower from the frame and makes it easier to ensure the rigidity and durability of the refrigerant path. According to another feature of the present invention, the radiator is provided facing a flat step floor on which the driver can place both feet together, which prevents flying objects or muddy water from adhering to the radiator during driving.

[0015] To achieve the above object, the present invention is characterized by comprising a seat on which a driver sits, a handlebar provided opposite the seat for steering at least one of front and rear wheels, an electric motor disposed closer to the seat than the handlebar for rotating and driving at least one of the front and rear wheels, a cooling device for cooling the electric motor, and a frame extending between the front and rear wheels and supporting the front and rear wheels. a flat step floor between the steering wheel and the seat on which the driver can place both feet together; A self-propelled electric vehicle comprising: an electric motor that is directly or indirectly attached to and supported by a frame; and a cooling device that is directly or indirectly attached to and supported by the electric motor, The system has a radiator that exchanges heat with cooling water for water-cooling the electric motor, and a liquid pump that circulates the cooling water between the electric motor and the radiator. The radiator is directly or indirectly attached to and supported by the electric motor, and is located above the step floor, facing the step floor. The reason is that.

[0016] According to the features of the present invention configured as described above, the self-propelled electric vehicle has an electric motor directly or indirectly attached to and supported by the frame, and a cooling device directly or indirectly attached to and supported by the electric motor. This reduces the influence of vibrations from the frame and facilitates ensuring the rigidity and durability of the refrigerant path. Here, "directly attaching the cooling device to the electric motor" means attaching the cooling device directly to the electric motor, for example, via a mounting portion integral with the electric motor housing or in contact with the housing. Furthermore, "indirectly attaching the cooling device to the electric motor" means attaching the cooling device via a separate component so as not to directly contact the electric motor. Furthermore, support of the cooling device by the electric motor does not mean auxiliary support, but rather support in a state in which the cooling device can fully function with the sole support of the electric motor. Self-propelled electric vehicles include two-wheeled and three-wheeled motorcycles as well as four-wheeled carts and buggies. In this case, a relatively small self-propelled vehicle in which the electric motor is located between the handlebars and the seat is preferred.

[0017] According to the features of the present invention configured as above, In a self-propelled electric vehicle, the cooling device has a radiator and a liquid supply pump, and the radiator is attached and supported directly or indirectly to the electric motor, which makes the radiator less susceptible to the effects of vibrations from the frame and makes it easier to ensure the rigidity or durability of the refrigerant path. Furthermore, according to the features of the present invention configured as above, In self-propelled electric vehicles, the radiator is located on a flat step floor where the driver can place both feet together, so flying objects or muddy water may adhere to the inside of the radiator while driving. of It can be prevented.

[0018] Another feature of the present invention is that the self-propelled electric vehicle further includes a control device that controls operation of the electric motor, and the control device is located adjacent to the electric motor or in a housing shared with the electric motor. According to this feature of the present invention configured in this way, the self-propelled electric vehicle has the control device that controls operation of the electric motor located adjacent to the electric motor or in a housing shared with the electric motor, so that the control device can be efficiently cooled together with the electric motor by the cooling device.

[0019] Another feature of the present invention is that the self-propelled electric vehicle further comprises a secondary battery that supplies power to the electric motor, the secondary battery being disposed under the step floor.

[0020] Another feature of the present invention is that in the self-propelled electric vehicle, the liquid feed pump is attached and supported directly or indirectly to at least one of the electric motor and the radiator. According to this feature of the present invention, the self-propelled electric vehicle has the liquid feed pump attached and supported directly or indirectly to at least one of the electric motor and the radiator, making it possible to reduce the effect of vibrations from the frame on the liquid feed pump and to easily ensure the rigidity and durability of the refrigerant path.

[0021] Another feature of the present invention is that the self-propelled electric vehicle further includes a cooling water tank that stores cooling water, and the cooling water tank is attached and supported directly or indirectly to at least one of the electric motor, the radiator, and the liquid feed pump. According to this feature of the present invention configured in this way, the self-propelled electric vehicle has a cooling water tank that stores cooling water that is attached and supported directly or indirectly to at least one of the electric motor, the radiator, and the liquid feed pump, so that the cooling water tank is less susceptible to the effects of vibrations from the frame and it is easier to ensure the rigidity or durability of the refrigerant path.

[0022] Another feature of the present invention is that the self-propelled electric vehicle further includes an indirect support that supports the cooling device at a position spaced apart from the electric motor, and the cooling device is indirectly attached to and supported by the electric motor via the indirect support. According to this feature of the present invention, the self-propelled electric vehicle has a greater degree of freedom in attaching the cooling device to the electric motor, because the cooling device is indirectly attached to and supported by the electric motor via the indirect support.

[0023] Another feature of the present invention is that in the self-propelled electric vehicle, the electric motor is fixedly attached and supported to the frame. According to this feature of the present invention configured in this way, in the self-propelled electric vehicle, since the electric motor is fixedly attached and supported to the frame, there is no need to consider the movable range of the electric motor and the cooling device attached to the electric motor, as compared to when the electric motor is movably attached to the frame, and therefore the installation space for the electric motor and the entire self-propelled electric vehicle can be configured compactly.

[0024] Furthermore, the present invention can be embodied not only as an invention of a self-propelled electric vehicle, but also as an invention of an electric motor unit for the self-propelled electric vehicle.

[0025] Specifically, the electric motor unit includes a seat on which a driver sits, a handle provided opposite the seat for steering at least one of the front wheels and the rear wheels, an electric motor disposed closer to the seat than the handle and for driving at least one of the front wheels and the rear wheels to rotate, a cooling device for cooling the electric motor, and a frame extending between the front wheels and the rear wheels and supporting the front wheels and the rear wheels. a control device for controlling the operation of the electric motor; An electric motor unit for a self-propelled electric vehicle, comprising: an electric motor having a mounting portion for mounting the electric motor directly or indirectly to a frame; the control device is located adjacent to the motor or in a common housing with the motor; The cooling device is composed of a fan that blows air in a direction that the motor faces downwind or upwind, and is attached and supported directly or indirectly to the motor. Air flows are generated for the motor and the control device. With the electric motor unit configured in this way, it is possible to expect the same effects as those of the self-propelled electric vehicle.

[0026] Specifically, the electric motor unit includes a seat on which a driver sits, a handle provided opposite the seat for steering at least one of the front wheels and the rear wheels, an electric motor disposed closer to the seat than the handle and for driving at least one of the front wheels and the rear wheels to rotate, a cooling device for cooling the electric motor, and a frame extending between the front wheels and the rear wheels and supporting the front wheels and the rear wheels. a control device for controlling the operation of the electric motor; An electric motor unit for a self-propelled electric vehicle, comprising: an electric motor having a mounting portion for mounting the electric motor directly or indirectly to a frame; the control device is located adjacent to the motor or in a common housing with the motor; The cooling device is attached to and supported directly or indirectly by the electric motor, and has a radiator that exchanges heat with cooling water for water-cooling the electric motor, a liquid feed pump that circulates the cooling water between the electric motor and the radiator, and a blower that blows out air. The radiator is attached to and supported directly or indirectly by the electric motor, and the blower is attached to and supported directly or indirectly by at least one of the electric motor, the radiator, and the liquid feed pump, with the electric motor facing either downwind or upwind. Generates airflow for the motor and control unit With the electric motor unit configured in this way, it is possible to expect the same effects as those of the self-propelled electric vehicle. [Brief explanation of the drawings]

[0029] [Figure 1] 1 is a side view schematically showing an outline of the overall configuration of a self-propelled electric vehicle according to the present invention; [Figure 2] 2 is a perspective view showing the outline of the overall configuration of an electric motor unit mounted on the self-propelled electric vehicle shown in FIG. 1, as viewed from the left side of the self-propelled electric vehicle shown in FIG. 1. FIG. [Figure 3] 2 is a perspective view showing the outline of the overall configuration of an electric motor unit mounted on the self-propelled electric vehicle shown in FIG. 1, as viewed from the right side of the self-propelled electric vehicle shown in FIG. 1. FIG. [Figure 4] 2 is a block diagram showing an outline of a control system for the self-propelled electric vehicle shown in FIG. 1. FIG. [Figure 5] 4 is a perspective view showing an outline of the overall configuration of an indirect support in the electric motor unit shown in FIGS. 2 and 3, respectively. FIG. [Figure 6] 1. FIG. 5 is a perspective view showing the outline of the overall configuration of an electric motor unit mounted on a self-propelled electric vehicle according to a modified example of the present invention, as viewed from the left side of the self-propelled electric vehicle shown in FIG. [Figure 7] FIG. 9 is a perspective view showing the outline of the overall configuration of an electric motor unit according to another modified example of the present invention, as viewed from the left side of the self-propelled electric vehicle shown in FIG. 8. [Figure 8] 8 is a side view schematically showing the overall configuration of a self-propelled electric vehicle equipped with the electric motor unit shown in FIG. 7. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0030] An embodiment of a self-propelled electric vehicle according to the present invention will now be described with reference to the drawings. Fig. 1 is a side view schematically illustrating the overall configuration of a self-propelled electric vehicle 100 according to the present invention. Fig. 2 is a perspective view showing the overall configuration of an electric motor unit 120 mounted on the self-propelled electric vehicle 100 shown in Fig. 1, as viewed from the left side of the self-propelled electric vehicle 100 shown in Fig. 1. Fig. 3 is a perspective view showing the overall configuration of the electric motor unit 120 mounted on the self-propelled electric vehicle 100 shown in Fig. 1, as viewed from the right side of the self-propelled electric vehicle 100 shown in Fig. 1. Fig. 4 is a block diagram showing the overall control system of the self-propelled electric vehicle 100 shown in Fig. 1. The self-propelled electric vehicle 100 is a small motorcycle (a so-called scooter) that is driven by a rider U seated on a seat 110 with both feet together.

[0031] (Configuration of self-propelled electric vehicle 100) The self-propelled electric vehicle 100 includes a frame 101. The frame 101 is a component that forms the framework that maintains the shape of the self-propelled electric vehicle 100, and is made up of a combination of multiple iron pipes or plates. The frame 101 is mainly made up of a head pipe 102, a main frame 106, and seat rails 109.

[0032] The head pipe 102 is a cylindrical part that supports the front wheel 103 of the self-propelled electric vehicle 100 via a front fork 104. The front fork 104 is a part that is formed in a rod-like shape and extends on both sides of the front wheel 103, supports the front wheel 103 relative to the head pipe 102 so that the front wheel 103 can be steered in the left and right directions of the self-propelled electric vehicle 100, and is configured with a suspension mechanism (not shown). A handlebar 105 is provided at the upper end of the front fork 104. The handlebar 105 is a part that is used to steer the direction of travel of the self-propelled electric vehicle 100, and is formed in a rod-like shape that extends in the width direction of the left and right sides of the self-propelled electric vehicle 100. The handlebars 105 are formed as a pair, left and right, and one of the left and right handlebars forms an accelerator grip 105a for accelerating the self-propelled electric vehicle 100.

[0033] The main frame 106 is a central part of the frame 101 that supports the electric motor unit 120 and the secondary battery 115 and determines the strength of the frame 101, and is formed in a curved shape that extends diagonally downward from the front to the rear of the self-propelled electric vehicle 100, then extends horizontally and then extends diagonally upward again. The horizontally extending part of the main frame 106 supports the step floor 114 and the secondary battery 115, and the part that extends diagonally upward supports the swing arm 107 and the electric motor unit 120. The swing arm 107 supports the rear wheel 108 of the self-propelled electric vehicle 100 so that it can move up and down around a pivot 106a that connects it to the main frame 106.

[0034] The seat rails 109 are primarily portions that support the seat 110, the cargo bed 112, and the tail lamp 113, and are formed to extend obliquely upward toward the rear of the main frame 106. The seat 110 is a component on which the driver U of the self-propelled electric vehicle 100 sits with both feet together, and is made up of a cushioning material. The seat 110 is configured to be able to be opened and closed, and a storage space 111 is formed hollow below the seat 110 in which small items such as a helmet can be stored.

[0035] In this case, the bottom of the storage space 111 is configured to be openable and closable, allowing access to the electric motor unit 120. The loading platform 112 is a portion for carrying luggage, and is configured by a metal rod formed into a frame shape. The tail lamps 113 are lighting fixtures that are turned on when the driver U applies the brakes, turns on the turn signals, or turns on the headlamps at night, etc.

[0036] The step floor 114 is a portion on which the driver U seated in the seat 110 places his or her feet with both feet together, and is formed as a flat floor surface below and in front of the seat 110 and above the main frame 106.

[0037] The secondary battery 115 is a device that supplies power to the electric motor 121 and the electrical and electronic devices provided in the self-propelled electric vehicle 100, and is composed of a chargeable and dischargeable battery such as a nickel-metal hydride battery or a lithium-ion battery. The secondary battery 115 also stores regenerative electrical energy generated by the electric motor 121 when the self-propelled electric vehicle 100 decelerates. The secondary battery 115 is supported by the main frame 106 below the step floor 114.

[0038] The electric motor unit 120 is a group of devices that constitute a power source that generates driving force for rotating the rear wheels 108. Specifically, the electric motor unit 120 is mainly composed of an electric motor 121, a radiator 130, a liquid pump 135, a cooling water tank 138, and a blower 139. Note that in FIG. 1, the electric motor unit 120 should be drawn with dashed lines because it is disposed inside the self-propelled electric vehicle 100, but is shown with solid lines to facilitate understanding (the same applies to FIG. 8).

[0039] The electric motor 121 is a prime mover that generates a driving force for rotating the rear wheel 108, and is configured such that a rotor (not shown) having an output shaft is rotatably supported relative to a stator (not shown) within a housing 122. In this embodiment, the electric motor 121 is configured as an AC motor. However, it goes without saying that the electric motor 121 may also be configured as a DC motor. The electric motor 121 also includes a control device 127 and a reducer within the housing 122.

[0040] The housing 122 is a component that constitutes a housing that houses the motor 121, the control device 127, and the reducer, and is made of a metal material such as steel or a non-ferrous metal material such as aluminum. The housing 122 includes a first housing 123, a second housing 124, and a third housing 126.

[0041] The first housing 123 is a component that houses the electric motor 121 and is formed in the shape of a generally cylindrical body with both ends closed. The second housing 124 is a component that houses the control device 127 and is formed to extend along the side surface of the first housing 123 extending in the longitudinal direction and is attached to the first housing 123. The second housing 124 is formed with mounting portions 125 for mounting the electric motor 121 to the frame 101. In this embodiment, the mounting portions 125 are formed by four flat plates that are flush with the bottom surface of the second housing 124 that constitutes the bottom of the electric motor unit 120 and protrude laterally, and each of the four mounting portions 125 has a through hole formed therein through which a bolt passes. Note that each of the four mounting portions 125 is shown in FIGS. 1 and 2.

[0042] In addition, water channels (not shown) are formed between the outer surfaces of first housing 123 and second housing 124 and the housing spaces that respectively house electric motor 121 and control device 127. These water channels are flow paths for circulating cooling water for cooling electric motor 121 and control device 127, and each opens to the outer surface.

[0043] The third housing 126 is the part that houses the reducer, and is formed in a drop shape in side view at one of the longitudinal ends of the first housing 123 so as to cover the end and the end of the second housing 124.

[0044] The control device 127 is an electric / electronic device that controls the operation of the electric motor 121 and also comprehensively controls the operation of the self-propelled electric vehicle 100. More specifically, the control device 127 is configured by a microcomputer including a CPU, ROM, RAM, etc., and is also equipped with a power control unit (PCU) including an inverter, a boost converter, a DC-DC converter, etc. for directly controlling the operation of the electric motor 121.

[0045] Here, the inverter converts the DC current output from the secondary battery 115 into AC current and outputs it to the electric motor 121, and also converts the AC current output from the electric motor 121 into DC current and outputs it to the secondary battery 115. In addition, the boost converter boosts the voltage output from the secondary battery 115 and supplies it to the electric motor 121. In addition, the DC-DC converter lowers the voltage output from the electric motor 121 and supplies it to the secondary battery 115.

[0046] This control device 127 executes a control program stored in a storage device such as a ROM, thereby controlling the rotational drive of the electric motor 121, the liquid pump 135, and the blower 139, controlling the operation of instruments, and controlling the lighting of lights in response to the operation of an accelerator grip 105a or an operator such as a turn signal provided on the handlebars 105. The control device 127 is housed in the second housing 124 of the housing 122, with the power supply terminals and electrical wiring exposed on the outer surface of the second housing 124.

[0047] The reducer is a mechanical device that reduces the rotation of the output shaft of the electric motor 121 and transmits the reduced rotation to the rear wheel 108, and is configured with a plurality of gear trains that are connected to the output shaft of the electric motor 121. This reducer is housed inside the third housing 126 with the output shaft 128 passing through the outside of the third housing 126. The output shaft 128 is connected to the rear wheel 108 via a chain.

[0048] Radiator 130 is a device for cooling, by heat exchange, coolant (not shown) that cools electric motor 121 and control device 127. Radiator 130 is configured, for example, with fins and water pipes between an upper tank and a lower tank, but it goes without saying that other configurations may be used as long as the configuration cools the coolant. Radiator 130 has an upstream side for introducing coolant connected to a water passage in housing 122 via pipe 131, and a downstream side for discharging coolant connected to liquid supply pump 135 via pipe 132. Radiator 130 is also connected to coolant tank 138 via pipe 133. Radiator 130 is attached to housing 122 via indirect support 134.

[0049] Pipe 131 is a component for guiding the cooling water that has cooled electric motor 121 and control device 127 to radiator 130, and is made of a metal pipe. In this embodiment, pipe 131 is connected to the water passage in first housing 123, but it can also be connected to the water passage in second housing 124. Pipe 132 is a component for guiding the cooling water that has been cooled by radiator 130 to liquid feed pump 135, and is made of a metal pipe similar to pipe 131.

[0050] Pipe line 133 is a component for guiding the cooling water stored in cooling water tank 138 to radiator 130, and is made of a metal pipe similar to pipe lines 131 and 132. Note that pipe lines 131, 132, and 133 can be made of flexible tubes in addition to rigid tubes.

[0051] The indirect support member 134 is a component for supporting the radiator 130 and the blower 139 at positions spaced apart from the electric motor 121, and is formed by bending a metal plate. More specifically, as shown in FIG. 5, the indirect support member 134 includes an electric motor mounting portion 134a, a first support portion 134b, and a second support portion 134c. The electric motor mounting portion 134a is a portion for mounting the indirect support member 134 to the electric motor 121, and is configured by forming two through holes in a flat plate body through which bolts pass. The electric motor mounting portion 134a is mounted to the housing 122 of the electric motor 121.

[0052] First support portion 134b is a portion to which blower 139 is attached, and is configured by forming two through holes, through which bolts pass, in a plate-like body extending in a strip shape from motor attachment portion 134a. In this case, first support portion 134b is formed to extend from motor attachment portion 134a so as to support blower 139 at a position where blower 139 does not come into contact with housing 122 of electric motor 121.

[0053] The second support portion 134c is a portion to which the radiator 130 is attached, and is configured by forming two through holes through which bolts pass in a plate-like body that is bent twice relative to the first support portion 134b and extends in a band shape. In this case, the second support portion 134c is formed extending from the first support portion 134b so as to support the radiator 130 at a position where the radiator 130 does not contact the blower 139. The indirect supports 134 are configured as a pair on the left and right so as to sandwich and support the radiator 130 and the blower 139 from both sides. In other words, the two indirect supports 134 are formed symmetrically.

[0054] The liquid feed pump 135 is a mechanical device for circulating the cooling water between the housing 122 and the radiator 130, and its operation is controlled by the control device 127. The upstream side of the liquid feed pump 135, which introduces the cooling water, is connected to the radiator 130 via a pipe 132, and the downstream side, which discharges the cooling water, is connected to the water channel of the housing 122 via a pipe 136. The liquid feed pump 135 is also attached to the radiator 130 via an indirect support 137.

[0055] Pipe line 136 is a component for guiding the cooling water discharged from liquid feed pump 135 to housing 122, and is configured from a metal pipe similar to pipe lines 131, 132, and 133. Pipe line 136 can be configured from a flexible tube in addition to a rigid tube similar to pipe lines 131, 132, and 133. These pipe lines 131, 132, 133, and 136 configure the refrigerant path according to the present invention.

[0056] The indirect support 137 is a component for supporting the liquid pump 135 at positions spaced apart from the electric motor 121 and the radiator 130, and is formed of two metal plate-like bodies standing on the top surface of the radiator 130. Indirect support 137 is connected via bolts to a plate-like member of the liquid feed pump 135 that hangs downward in the drawing, and fixedly supports the liquid feed pump 135 at positions spaced apart from the electric motor 121 and the radiator 130, respectively.

[0057] The cooling water tank 138 is a container for storing cooling water for cooling the electric motor 121 and the control device 127, and is made of a resin or metal material. In other words, the cooling water tank 138 is a reservoir tank. The cooling water tank 138 is directly attached to the housing 122 of the electric motor 121 via bolts. In this embodiment, the cooling water tank 138 is attached to the top of the electric motor unit 120 on the side opposite the bottom. The radiator 130, the liquid feed pump 135, and the cooling water tank 138 correspond to the cooling device according to the present invention.

[0058] The blower 139 is a mechanical device for cooling the electric motor 121 and the control device 127 by generating airflow therethrough, and is configured with a propeller fan whose operation is controlled by the control device 127. The blower 139 is disposed between the electric motor 121 and the radiator 130, and is supported on both sides by the first support portion 134b of the indirect support member 134. In this case, the blower 139 is disposed in such a direction that the radiator 130 is on the windward side and the electric motor 121 is on the leeward side.

[0059] In the electric motor unit 120 configured in this manner, the mounting portion 125 of the housing 122 is fixedly attached to the frame 101 via bolts. That is, the electric motor unit 120 is directly attached with the housing 122 of the electric motor 121 in close contact with the frame 101. In this case, the radiator 130, the liquid feed pump 135, the cooling water tank 138, and the blower 139 that constitute the electric motor unit 120 are all fixedly attached to the frame 101 via the electric motor 121 in a non-contact state with the frame 101.

[0060] In the process of assembling this motor unit 120 into the self-propelled electric vehicle 100, the radiator 130, the liquid pump 135, the cooling water tank 138, and the blower 139 are respectively attached to the electric motor 121 to assemble the motor unit 120, and then the motor unit 120 can be attached to the frame 101. This allows the manufacturer of the self-propelled electric vehicle 100 to separate the manufacturing work of the motor unit 120 from the manufacturing work of the self-propelled electric vehicle 100, so that the manufacturing times or locations of the motor unit 120 and the self-propelled electric vehicle 100 can be separated, thereby increasing the degree of freedom in the assembly work. Furthermore, the self-propelled electric vehicle 100 also simplifies the assembly work itself of the components that make up the motor unit 120 into the self-propelled electric vehicle 100.

[0061] In addition to the above, the assembly process of the electric motor unit 120 to the self-propelled electric vehicle 100 can also be performed by assembling the electric motor 121, radiator 130, liquid pump 135, cooling water tank 138, and blower 139 to the frame 101 in that order, thereby assembling the electric motor unit 120 to the frame 101.

[0062] (Operation of the self-propelled electric vehicle 100) Next, we will explain the operation of the self-propelled electric vehicle 100 configured as described above. The driver U of this self-propelled electric vehicle 100 starts the control device 127 by operating a switch while seated on the seat 110 of the self-propelled electric vehicle 100, and then can drive the self-propelled electric vehicle 100 by operating the accelerator by rotating the accelerator grip 105a.

[0063] In this case, large and small vibrations are transmitted to the electric motor unit 120 via the frame 101 depending on the driving environment of the self-propelled electric vehicle 100. However, in the electric motor unit 120, the radiator 130, the liquid feed pump 135, and the cooling water tank 138 are attached directly or indirectly via indirect supports 134 and 137 to the electric motor 121, which is a heavy object, and therefore the vibrations transmitted from the frame 101 can be prevented from being transmitted directly and can be attenuated.

[0064] Furthermore, the electric motor unit 120 allows the radiator 130, the liquid pump 135, and the cooling water tank 138 to vibrate integrally or nearly integrally with the electric motor 121, compared to when the radiator 130, the liquid pump 135, and the cooling water tank 138 are attached to the frame 101. This allows the electric motor unit 120 to reduce damage, deterioration, or loosening of the pipes 131, 132, 133, and 136. These effects are effectively demonstrated when the self-propelled electric vehicle 100 suddenly goes over a large step or depression while traveling, or when traveling on a road surface such as an uneven road where small vibrations continue continuously.

[0065] As can be understood from the above description of operation, according to the above embodiment, the self-propelled electric vehicle 100 has the electric motor 121 directly attached to and supported by the frame 101, and the radiator 130, liquid supply pump 135, and cooling water tank 138 attached to and supported by the electric motor 121 directly or indirectly via indirect supports 134, 137, which makes it less susceptible to the effects of vibrations from the frame 101 and makes it easier to ensure the rigidity or durability of the cooling water refrigerant path.

[0066] Furthermore, the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the scope of the present invention. In the modifications described below, the same components as those of self-propelled electric vehicle 100 in the above-described embodiment are denoted by the same reference numerals, and their description will be omitted.

[0067] For example, in the above embodiment, the electric motor unit 120 is configured so that the electric motor 121 is directly attached to the frame 101 via the attachment portion 125. However, the electric motor unit 120 can also indirectly attach the electric motor 121 to the frame 101 via the attachment portion 140. In this case, the attachment portion 140 is formed to extend in an L-shape in a side view so that the electric motor 121 can be fixed at a position above the frame 101 so that it is spaced apart from the frame 101 and does not come into contact with the frame 101.

[0068] This allows the electric motor unit 120 to suppress the vibration of the frame 101 from being directly transmitted to the electric motor 121. Furthermore, the electric motor unit 120 can suppress the vibration of the frame 101 from being directly transmitted to the electric motor 121 by attaching the mounting portions 125, 140 to the frame 101 via an elastic body such as a rubber material.

[0069] In the above embodiment, the radiator 130 and the blower 139 of the electric motor unit 120 are indirectly attached to the electric motor 121 via the indirect support 134. However, the radiator 130 and the blower 139 of the electric motor unit 120 may be directly attached to the electric motor 121, like the cooling water tank 138. Also, the electric motor unit 120 may be such that the blower 139 is directly or indirectly attached only to the radiator 130, the liquid pump 135, or the cooling water tank 138.

[0070] In addition, the electric motor unit 120 has the liquid pump 135 indirectly attached to the radiator 130 via the indirect support 137. However, the electric motor unit 120 may have the liquid pump 135 directly attached to the electric motor 121 or the radiator 130, or may have the liquid pump 135 attached to the electric motor 121 via separate components such as the indirect supports 134 and 137. 1 to Alternatively, the motor unit 120 may indirectly attach the cooling water tank 138 to the motor 121, the radiator 130, or the liquid pump 135 via separate components such as indirect supports 134 and 137.

[0071] In the above embodiment, the blower 139 is provided between the electric motor 121 and the radiator 130. In this case, the blower 139 is disposed so that the radiator 130 is on the windward side and the electric motor 121 is on the leeward side. This allows the blower 139 to effectively cool the electric motor 121 and the radiator 130 simultaneously. However, the blower 139 can also be disposed so that the radiator 130 is on the leeward side and the electric motor 121 is on the windward side.

[0072] In the above embodiment, the cooling device according to the present invention is configured with the radiator 130, the liquid pump 135, the cooling water tank 138, and the blower 139. However, the cooling device according to the present invention may be any device that can cool the electric motor 121. Therefore, the cooling device according to the present invention may be configured with only the radiator 130 and the liquid pump 135, or may be configured with only the blower 139.

[0073] Furthermore, in the above embodiment, the electric motor unit 120 has the cooling water tank 138 disposed above the self-propelled electric vehicle 100 relative to the electric motor 121, and the control device 127 disposed below, resulting in an overall vertically long configuration in which the up-down direction is longer than the front-to-rear direction. As a result, the electric motor unit 120 can shorten the length of the self-propelled electric vehicle 100 in the front-to-rear direction, thereby enabling the overall length of the self-propelled electric vehicle 100 to be compact. Furthermore, since the cooling water tank 138 is disposed directly below the accommodation space 111, maintenance work on the cooling water tank 138 can be easily performed on the self-propelled electric vehicle 100.

[0074] However, the mounting positions of the radiator 130, liquid pump 135, cooling water tank 138, and blower 139 of the electric motor unit 120 are not limited to those in the above embodiment, and the electric motor unit 120 can also be mounted in positions other than those in the above embodiment. Therefore, for example, as shown in Fig. 7, the electric motor unit 120 can have a second housing 124 formed above the self-propelled electric vehicle 100 with the electric motor 121 and the control device 127 disposed inside this second housing 124, and the cooling water tank 138 disposed on the opposite side of the radiator 130 with respect to the electric motor 121 (rear side of the self-propelled electric vehicle 100). This results in the electric motor unit 120 having a horizontally elongated configuration in which the front-to-rear direction is longer than the top-to-bottom direction as a whole, as shown in Fig. 8, and can be mounted to the frame 101 of the self-propelled electric vehicle 100 in this state.

[0075] As a result, the electric motor unit 120 can reduce the vertical length of the self-propelled electric vehicle 100, making it possible to configure the self-propelled electric vehicle 100 to be compact in overall height, and also to increase the capacity of the storage space 111. Furthermore, in the self-propelled electric vehicle 100, the control device 127 is disposed directly below the storage space 111, making it easy to perform maintenance work on the control device 127. In the electric motor units 120 shown in FIGS. 7 and 8, the liquid feed pump 135 is indirectly attached below the radiator 130 via an indirect support 137.

[0076] Furthermore, in the above embodiment, the electric motor unit 120 is disposed with the radiator 130 facing the step floor 114. In this case, the radiator 130 faces the step floor 114 via an opening such as a louver. This prevents flying objects or muddy water from adhering to the inside of the radiator 130 during travel of the electric motor unit 120. However, the radiator 130 does not necessarily have to be disposed facing the step floor 114, and may be disposed in a direction other than the step floor 114, for example, facing to the side, downward, or rear of the self-propelled electric vehicle 100.

[0077] In the above embodiment, the electric motor 121 is configured such that the housing 122 includes the second housing 124 and the third housing 126, thereby integrally including the control device 127 and the reducer. However, the electric motor 121 does not necessarily have to include the control device 127 and the reducer integrally, and can be configured as a single electric motor 121. In this case, the electric motor 121 can be configured compactly because the housing 122 can be configured with only the first housing 123.

[0078] In the above embodiment, the electric motor unit 120 is fixedly attached to the frame 101. However, the electric motor unit 120 can also be movably attached to the frame 101. Specifically, the electric motor unit 120 can be movably attached to the frame 101 by being attached to the pivot 106a of the frame 101, similar to the swing arm 107.

[0079] In the above embodiment, the indirect support 134 is configured to include the electric motor mounting portion 134a, the first support portion 134b, and the second support portion 134c. This allows the indirect support 134 to indirectly support two devices, specifically, the blower 139 and the radiator 130, relative to the electric motor 121. However, the indirect support 134 can also be configured to support one or three or more devices, for example, at least one device selected from the radiator 130, the liquid pump 135, the cooling water tank 138, and the blower 139, relative to the electric motor 121.

[0080] In the above embodiment, the electric motor unit 120 is mounted on a small motorcycle (so-called scooter) that is driven by the rider U seated on the seat 110 with both feet together. However, the electric motor unit 120 can be mounted on a wide variety of self-propelled electric vehicles, such as two-wheeled or three-wheeled motorcycles, as well as four-wheeled carts. In this case, for example, the electric motor unit 120 can be mounted on a saddle-ride type two-wheeled, three-wheeled, or four-wheeled vehicle in which the rider sits astride the seat 110. The electric motor unit 120 can also be mounted on a front-wheel drive or all-wheel drive vehicle in addition to a rear-wheel drive vehicle. The electric motor unit 120 can also be mounted on a self-propelled electric vehicle with steering the front wheels as well as a rear-wheel drive vehicle. In the self-propelled electric vehicle 100, the secondary battery 115 can be disposed in a location other than below the step floor 114, for example, below the seat 110 or inside the cowl. [Explanation of symbols]

[0081] U...Driver, 100...self-propelled electric vehicle, 101...frame, 102...head pipe, 103...front wheel, 104...front fork, 105...handle, 105a...accelerator grip, 106...main frame, 106a...pivot, 107...swing arm, 108...rear wheel, 109...seat rail, 110...seat, 111...storage space, 112...luggage bed, 113...tail lamp, 114...step floor, 115...secondary battery, 120...electric motor unit, 121...electric motor, 122...housing, 123...first housing, 124...second housing, 125...mounting portion, 126...third housing, 127...control device, 128...output shaft, 130...radiator, 131...pipe, 132...pipe, 133...pipe, 134...indirect support, 134a...motor mounting portion, 134b...first support portion, 134c...second support portion, 135...liquid supply pump, 136...pipe, 137...indirect support, 138...cooling water tank, 139...blower, 140...Mounting part.

Claims

1. A seat on which the driver sits, a handle provided opposite the seat for steering at least one of front wheels and rear wheels; an electric motor disposed closer to the seat than the handlebars and configured to rotate and drive at least one of the front wheels and the rear wheels; a cooling device for cooling the electric motor; a frame extending between the front wheels and the rear wheels to support the front wheels and the rear wheels; A self-propelled electric vehicle comprising a control device that controls operation of the electric motor, The electric motor is is directly or indirectly attached to and supported by the frame; The control device Located adjacent to the electric motor or in a common housing with the electric motor; The cooling device is A self-propelled electric vehicle characterized in that the electric motor is configured with a blower that blows air in a direction that faces the downwind or upwind side, and is attached and supported directly or indirectly to the electric motor to generate air flows toward the electric motor and the control device, respectively.

2. A seat on which the driver sits, a handle provided opposite the seat for steering at least one of front wheels and rear wheels; an electric motor disposed closer to the seat than the handlebars and configured to rotate and drive at least one of the front wheels and the rear wheels; a cooling device for cooling the electric motor; a frame extending between the front wheels and the rear wheels to support the front wheels and the rear wheels, The electric motor is is directly or indirectly attached to and supported by the frame; The cooling device is A motor is directly or indirectly attached to and supported by the motor, a radiator that exchanges heat with cooling water for water-cooling the electric motor; a liquid pump that circulates the cooling water between the electric motor and the radiator; and a blower for blowing out air, The radiator is is directly or indirectly attached to and supported by the electric motor; The blower is A self-propelled electric vehicle characterized in that the electric motor is directly or indirectly attached to and supported by at least one of the electric motor, the radiator, and the liquid supply pump, with the electric motor facing downwind or upwind, and is disposed between the electric motor and the radiator.

3. A seat on which the driver sits, a handle provided opposite the seat for steering at least one of front wheels and rear wheels; an electric motor disposed closer to the seat than the handlebars and configured to rotate and drive at least one of the front wheels and the rear wheels; a cooling device for cooling the electric motor; a frame extending between the front wheels and the rear wheels to support the front wheels and the rear wheels; A self-propelled electric vehicle comprising a control device that controls operation of the electric motor, The electric motor is is directly or indirectly attached to and supported by the frame; The control device Located adjacent to the electric motor or in a common housing with the electric motor; The cooling device is A motor is directly or indirectly attached to and supported by the motor, a radiator that exchanges heat with cooling water for water-cooling the electric motor; a liquid pump that circulates the cooling water between the electric motor and the radiator; and a blower for blowing out air, The radiator is is directly or indirectly attached to and supported by the electric motor; The blower is A self-propelled electric vehicle characterized in that the electric motor is directly or indirectly attached and supported to at least one of the electric motor, the radiator, and the liquid feed pump with the electric motor facing downwind or upwind, thereby generating airflows toward the electric motor and the control device, respectively.

4. A seat on which the driver sits, a handle provided opposite the seat for steering at least one of front wheels and rear wheels; an electric motor disposed closer to the seat than the handlebars and configured to rotate and drive at least one of the front wheels and the rear wheels; a cooling device for cooling the electric motor; a frame extending between the front wheels and the rear wheels to support the front wheels and the rear wheels; A self-propelled electric vehicle including a planar step floor on which the driver can place both feet together between the handlebars and the seat, The electric motor is is directly or indirectly attached to and supported by the frame; The cooling device is A motor is directly or indirectly attached to and supported by the motor, a radiator that exchanges heat with cooling water for water-cooling the electric motor; a liquid pump that circulates the cooling water between the electric motor and the radiator; and a blower for blowing out air, The radiator is The step floor is directly or indirectly attached to and supported by the electric motor, and is provided at a position above the step floor facing the step floor, The blower is A self-propelled electric vehicle characterized in that the electric motor is directly or indirectly attached and supported to at least one of the electric motor, the radiator, and the liquid feed pump, with the electric motor facing downwind or upwind.

5. A seat on which the driver sits, a handle provided opposite the seat for steering at least one of front wheels and rear wheels; an electric motor disposed closer to the seat than the handlebars and configured to rotate and drive at least one of the front wheels and the rear wheels; a cooling device for cooling the electric motor; a frame extending between the front wheels and the rear wheels to support the front wheels and the rear wheels; A self-propelled electric vehicle including a planar step floor on which the driver can place both feet together between the handlebars and the seat, The electric motor is is directly or indirectly attached to and supported by the frame; The cooling device is A motor is directly or indirectly attached to and supported by the motor, a radiator that exchanges heat with cooling water for water-cooling the electric motor; a liquid pump that circulates the cooling water between the electric motor and the radiator, The radiator is A self-propelled electric vehicle characterized in that it is directly or indirectly attached to and supported by the electric motor, and is provided at a position above the step floor facing the step floor.

6. The self-propelled electric vehicle according to claim 5, further comprising: a control device for controlling the operation of the electric motor; The control device A self-propelled electric vehicle characterized in that the motor is disposed adjacent to the electric motor or in a common housing with the electric motor.

7. A self-propelled electric vehicle according to any one of claims 4 to 6, further comprising: a secondary battery for supplying power to the electric motor; The secondary battery is A self-propelled electric vehicle, characterized in that it is disposed under the step floor.

8. The self-propelled electric vehicle according to any one of claims 2 to 6, The liquid feed pump is A self-propelled electric vehicle, characterized in that it is directly or indirectly attached to and supported by at least one of the electric motor and the radiator.

9. The self-propelled electric vehicle according to claim 2, claim 3, claim 4, claim 5, claim 6 or claim 8, further comprising: a cooling water tank for storing the cooling water; The cooling water tank is A self-propelled electric vehicle, characterized in that it is directly or indirectly attached to and supported by at least one of the electric motor, the radiator, and the liquid feed pump.

10. The self-propelled electric vehicle according to any one of claims 1 to 9, further comprising: an indirect support that supports the cooling device at a position spaced apart from the electric motor; The cooling device is A self-propelled electric vehicle, characterized in that it is indirectly attached to and supported by the electric motor via the indirect support body.

11. The self-propelled electric vehicle according to any one of claims 1 to 10, The electric motor is A self-propelled electric vehicle characterized in that it is fixedly attached to and supported by the frame.

12. A seat on which the driver sits, a handle provided opposite the seat for steering at least one of front wheels and rear wheels; an electric motor disposed closer to the seat than the handlebars and configured to rotate and drive at least one of the front wheels and the rear wheels; a cooling device for cooling the electric motor; a frame extending between the front wheels and the rear wheels to support the front wheels and the rear wheels; An electric motor unit for a self-propelled electric vehicle, comprising: a control device for controlling operation of the electric motor, The electric motor is a mounting portion for mounting the frame directly or indirectly; The control device Located adjacent to the electric motor or in a common housing with the electric motor; The cooling device is An electric motor unit for a self-propelled electric vehicle, characterized in that it is composed of a blower that blows air in a direction that faces the downwind or upwind side of the electric motor, and is attached and supported directly or indirectly to the electric motor to generate air flows toward the electric motor and the control device, respectively.

13. A seat on which the driver sits, a handle provided opposite the seat for steering at least one of front wheels and rear wheels; an electric motor disposed closer to the seat than the handlebars and configured to rotate and drive at least one of the front wheels and the rear wheels; a cooling device for cooling the electric motor; a frame extending between the front wheels and the rear wheels to support the front wheels and the rear wheels; An electric motor unit for a self-propelled electric vehicle, comprising: a control device for controlling operation of the electric motor, The electric motor is a mounting portion for mounting the frame directly or indirectly; The control device Located adjacent to the electric motor or in a common housing with the electric motor; The cooling device is A motor is directly or indirectly attached to and supported by the motor, a radiator that exchanges heat with cooling water for water-cooling the electric motor; a liquid pump that circulates the cooling water between the electric motor and the radiator; and a blower for blowing out air, The radiator is is directly or indirectly attached to and supported by the electric motor; The blower is An electric motor unit for a self-propelled electric vehicle, characterized in that the electric motor is directly or indirectly attached to and supported by at least one of the electric motor, the radiator, and the liquid supply pump with the electric motor facing downwind or upwind, thereby generating airflows toward the electric motor and the control device, respectively.

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