JP4215670B2 - Motor device and electric bicycle using the same - Google Patents

Description

  The present invention relates to a motor device that converts electrical energy into mechanical energy (rotational energy) and an electric bicycle using the motor device, and more particularly to a heat countermeasure technique for the motor device.

Conventionally, as a heat countermeasure technique of a motor device, a rotor that is rotatably supported, a stator that applies rotational torque to the rotor, an outer housing that houses the rotor and the stator, A cooling fan integrally attached to the rotor, an intake port formed to take outside air into the outer casing by the rotating action of the cooling fan, and an inner space of the outer casing by the rotating action of the cooling fan A motor device is disclosed and proposed, which includes an exhaust port formed to discharge the air to the outside (see, for example, Patent Document 1).
JP 2002-354750 A

  Certainly, with the motor device having the above-described configuration, it is possible to release drive heat inside the device to the outside without increasing the device scale.

  However, since the motor device configured as described above is configured to attach the cooling fan to the dead space formed by the high-density winding structure of the stator, the size of the cooling fan cannot be said to be wide. It was limited to the size that could be accommodated. Therefore, in the motor device having the above-described configuration, there is a possibility that the heat dissipating capacity of the cooling fan becomes insufficient as the size and performance of the motor device are reduced.

  In particular, in a motor device (hereinafter referred to as a hub motor device) mounted on a hub (wheel shaft portion) of an electric hybrid bicycle, heat exchange with outside air is blocked by the hub, so that the above problem may appear more remarkably. It was.

  In addition, the hub motor device described above is strongly desired to be reduced in size so as not to affect the functionality and design of the bicycle as much as possible. The size in the direction of the rotation axis (width direction) is the same as that of the front wheel. It was limited to the size that can be installed between the frames sandwiched from the left and right. Therefore, in such a hub motor device, the dead space is eliminated as much as possible, and it may be difficult to provide a cooling fan in the dead space.

  In view of the above problems, the present invention provides a motor device capable of efficiently releasing drive heat inside the device to the outside without increasing the device scale, and an electric bicycle using the same. With the goal.

  In order to achieve the above object, a motor device according to the present invention includes a rotor that is rotatably supported, a stator that applies rotational torque to the rotor, and the rotor and the stator that are housed or fixed. A drive mechanism unit having an outer casing; and a part or all of the drive mechanism unit is included, and is supported rotatably around the drive mechanism unit according to a rotation output of the drive mechanism unit. The outer casing includes an intake port for taking in air outside of the outer casing, and an exhaust port for discharging the air inside of the outer casing to the outside. The rotated member has a fin on its inner wall that generates an air flow from the intake port to the exhaust port through the inside of the outer casing.

  In the motor device configured as described above, the rotated member may be configured to have a communication path that communicates the outside with the intake port and the exhaust port.

  On the other hand, an electric bicycle according to the present invention includes an axle, a wheel, a rotor that is rotatably supported, a stator that applies a rotational torque to the rotor, and a fixed to the axle. A drive mechanism having an outer casing that houses or fixes the stator; a reduction mechanism that decelerates the rotational output of the drive mechanism; and a part of the drive mechanism and the reduction mechanism A rotated member that includes all of the members and is rotatably supported around the drive mechanism unit and the speed reduction mechanism unit according to the rotation output of the drive mechanism unit transmitted through the speed reduction mechanism unit, A hub fixed to the wheel and rotatably supporting the wheel about the axle, wherein the outer casing has an intake port for taking in the air outside thereof; To exhaust the air inside it, Made has the exhaust port, wherein the hub has on its inner wall, has a configuration comprising a fin that produces an air flow leading to the exhaust port through the inside of the outer casing from the intake port.

  In the electric bicycle according to the present invention, the axle and / or the hub may have a communication path that communicates the outside with the intake port and the exhaust port.

  In the electric bicycle according to the present invention, the fin may have a shape and / or arrangement that generates an air flow that flows into the intake port without passing through the speed reduction mechanism.

  With the motor device configured as described above and an electric bicycle using the motor device, it is possible to efficiently release the drive heat inside the device to the outside without increasing the device scale.

  Hereinafter, a detailed description will be given by taking as an example a case where the present invention is applied to a hub motor device mounted on an electric hybrid bicycle.

  FIG. 1 is an overall view showing an embodiment of an electric hybrid bicycle according to the present invention. As shown in the figure, the electric hybrid bicycle 1 according to the present embodiment is configured such that a front wheel 3, a rear wheel 4, a handle 5 and a saddle 6 are attached to a frame 2 so that the front wheel 3 is steered by the handle 5. It is configured.

  Further, a battery 17 serving as a power source for the electric drive unit 10 described later is detachably attached to the saddle support portion of the frame 2. In the present embodiment, a battery 17 capable of generating a power supply voltage of approximately 24 volts is used. In addition, the installation position of the battery 17 is not limited to this, You may provide in another location (under the cage | basket | car 16, etc.).

  The human power drive unit 7 includes a pedal 8 and a chain 9, and when the user steps on the pedal 8, the rear wheel 4 is rotated via the chain 9. In the present embodiment, the case where the chain 9 is used as a member for transmitting human power to the rear wheel 4 has been described as an example. However, the configuration of the present invention is not limited to this, and a belt instead of the chain 9 is used. Alternatively, a rotating shaft or the like may be used.

  The electric drive unit 10 provided on the hub (rotating shaft unit) of the front wheel 3 includes a hub motor device that will be described in detail later. By driving the hub motor device when electric drive is necessary, the human power drive unit 10 is provided. At the same time, the rear wheel 4 is rotated. Since the front wheel 3 is independent of the chain 9 and a transmission (not shown), the maintainability can be improved by providing the electric drive unit 10 on the hub of the front wheel 3. However, the installation position of the electric drive unit 10 is not limited to this, and may be provided on the hub of the rear wheel 4.

  Brake levers 11 are respectively attached to the left and right ends of the steering wheel 5 that is a steering means for the front wheels 3. It is connected. A car 16 is provided in front of the handle 5. A brake switch (not shown) is provided in the middle of the wires 14 and 15, and when the brake lever 11 is operated, energization to the electric drive unit 10 is stopped and power regeneration to the battery 17 is started. It is a mechanism.

  Next, the structure and operation of the hub motor device provided in the electric drive unit 10 will be described in detail. 2 and 3 are cross-sectional views schematically showing the installation state and internal structure of the hub motor device according to the present invention. 2 and 3 (a) are cross-sectional views of the hub motor device as viewed from the front of the bicycle 1, and FIG. 3 (b) is a cross-sectional view of the hub motor device taken along line AA 'in FIG. 3 (a). It is sectional drawing at the time of doing.

  As shown in FIG. 2, the hub motor device 20 of the present embodiment includes a drive mechanism unit 21 that converts electrical energy supplied from a battery unit 17 (not shown) into mechanical energy (rotational energy), and rotation of the drive mechanism unit 21. The front wheel 3 fixed thereto is rotatably supported around the axles 18a and 18b in accordance with the rotational output of the speed reduction mechanism 22 that decelerates the output and the drive mechanism 21 transmitted through the speed reduction mechanism 22. And a hub 23.

  As shown in FIG. 3, the drive mechanism unit 21 includes a rotor 211, a stator 212, and an outer casing 213. The rotor 211 includes a rotor core 211a in which a permanent magnet is embedded and a rotor shaft 211b connected thereto, and is rotatably supported by bearings B1 and B2. One end of the rotor shaft 211b protrudes from the outer casing 213, and a gear (not shown) for transmitting the rotation output to the speed reduction mechanism unit 22 is carved at the one end. The stator 212 includes a stator core 212a and a stator winding 212b wound around the stator core 212a. The stator 212 receives power supply from a battery unit 17 (not shown) via a power outlet 213a formed in the outer casing 23. A rotational torque is applied to the rotor 211. The outer casing 213 that accommodates the rotor 211 and the stator 212 is directly fixed to the axle 18a, and is also attached to the axle 18b via a planetary gear shaft 222 and a planetary gear shaft fixing bracket 223 of the speed reduction mechanism 22 described later. It is fixed. In addition to the power outlet 213a described above, the outer casing 213 of the present embodiment includes an intake port 213b for taking the outside air into the inside and an exhaust port for discharging the inside air to the outside. 213c. On the other hand, the axles 18a and 18b fixed to the outer casing 213 have hollow portions 18c and 18d, respectively, as communication paths that communicate the outside with the intake port 213b and the exhaust port 213c. By adopting such a configuration, it becomes possible to efficiently promote the exchange of the inside and outside air by the rotational action of the fins 231 described later.

  As a means for realizing the above-described communication path, the axles 18a and 18b may be formed by hollow pipes, and tubes or the like may be passed through the axles 18a and 18b and the hub 23. Similarly, the intake port 213b and the exhaust port 213c described above may also be realized by passing a tube or the like through the outer casing 213.

  The speed reduction mechanism 22 includes a planetary gear 221 that meshes with a gear carved at one end of the rotor shaft 211b, a planetary gear shaft 222 that serves as a rotation center of the planetary gear 221, an outer casing 213, and the planetary gear shaft 222 that are connected to the axle 18b. And a planetary gear shaft fixing bracket 223 for fixing to the planetary gear 221 and an internal gear (internal gear) 224 meshing with the planetary gear 221, and the rotational output of the drive mechanism 21 is transmitted to the planetary gear 222 and the internal gear. The speed is reduced to a required level (for example, 1/16) by the gear 224 and then transmitted to the hub 23.

  The hub 23 includes a part of the drive mechanism 21 and the entire speed reduction mechanism 22, and the drive mechanism 21 and the speed reduction mechanism according to the rotation output of the drive mechanism 21 transmitted through the speed reduction mechanism 22. 22 is a to-be-rotated member that is supported so as to be rotatable around the inner wall 22, and an air flow (in the direction of the arrow in FIGS. 2 and 3) from the intake port 213 b to the exhaust port 213 c through the interior of the outer casing 213 And fins 231 for generating a flowing air flow). Bearings B3 and B4 are provided between the hub 23 and the outer casing 213 and between the hub 23 and the axle 18b, respectively.

  Subsequently, the heat dissipation operation of the hub motor device 20 configured as described above will be described in detail.

  When electric power is supplied from the battery unit 17 to the hub motor device 20 configured as described above, and the hub 23 is rotated by the drive mechanism unit 21 and the speed reduction mechanism unit 22, the inside of the hub 23 is caused by the fins 231 that rotate accordingly. As described above, an air flow that flows in the direction of the arrow in FIGS. 2 and 3 is generated.

  That is, when the hub motor device 20 is driven, outside air is taken into the outer casing 213 through the bearing B1 from the intake port 213b communicating with the hollow portion 18c of the axle 18a by the rotating action of the fins 231 and generates a heat source (in particular, a fixed The child winding 212b) is cooled. In the hub motor device 20 of the present embodiment, the power outlet 213a is also used as an intake port, and outside air is taken into the outer casing 213 from the power outlet 213a.

  On the other hand, the air inside the outer casing 213 heated by heat exchange with the heat generation source is led to the outside of the outer casing 213 through the exhaust port 213c and the bearing B2 by the rotating action of the fins 231 and the axle together with the air inside the hub 23. It is discharged from the hollow portion 18d of 18b to the outside.

  As described above, in the hub motor device 20 of the present embodiment, the rotation of the fins 231 attached to the inner wall of the hub 23 allows efficient air cooling inside the outer casing 213 and the inside of the hub 23 without increasing the device scale. It is possible to dissipate heat. Since the fins 231 are attached to the inner wall of the hub 23 that is rotated when the hub motor device 20 is driven, no extra energy is consumed when obtaining the heat dissipation action.

  In addition, since the hub motor device 20 of the present embodiment has a configuration in which the fins 231 are provided on the inner wall of the hub 23, the installation space for the fins 231 can be increased compared to a configuration in which the fins are provided in the outer casing 213. . Therefore, the number of installed fins 231 can be increased without increasing the size in the axle direction (width direction), and the heat dissipation characteristics can be improved.

  In the hub motor device 20 of the present embodiment, the fins 231 generate an air flow (that is, an air flow that flows in the direction of the arrow in FIGS. 2 and 3) flowing into the intake port 213b without passing through the speed reduction mechanism unit 22. The shape and the arrangement are generated. As described above, by adopting a configuration in which the outside air is directly guided to the suction port 213b, the heat generation source in the outer casing 213 can be efficiently cooled. However, the direction of the air flow is not limited to this, and the shape and arrangement of the fins 231 may be reversed from those of the present embodiment, and the direction of the air flow may be reversed.

  In the above description, the case where the present invention is applied to a hub motor device mounted on an electric hybrid bicycle has been described as an example. However, the application target of the present invention is not limited to this, and a drive mechanism unit The present invention can be widely applied to all motor devices that include a part to be rotated and that are rotatably supported around the periphery of the drive mechanism according to the rotational output of the drive mechanism.

  The present invention is a technique useful in reducing the size and performance of a motor device, and is particularly suitable for heat countermeasures of a hub motor device mounted on a hub of an electric bicycle.

FIG. 1 is an overall view showing one embodiment of an electric hybrid bicycle according to the present invention. These are sectional drawings which show typically the installation state of the hub motor device concerning the present invention. These are sectional drawings which show typically the internal structure of the hub motor device concerning the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric hybrid bicycle 2 Frame 3 Front wheel 4 Rear wheel 5 Handle 6 Saddle 7 Human power drive part 8 Pedal 9 Chain 10 Electric drive part 11 Brake lever 12, 13 Brake device 14, 15 Wire 16 Car 17 Battery part 18a, 18b Axle 18c, 18d Hollow part 20 Hub motor device 21 Drive mechanism part 211 Rotor 211a Rotor core 211b Rotor shaft 212 Stator 212a Stator iron core 212b Stator winding 213 Outer casing 213a Power outlet 213b Inlet 213c Exhaust outlet 22 Deceleration mechanism 221 Planetary gear 222 Planetary gear shaft 223 Planetary gear shaft fixing bracket 224 Internal gear 23 Hub 231 Fin B1-B4 Bearing

Claims (2)

A drive mechanism section comprising: a rotor that is rotatably supported; a stator that applies rotational torque to the rotor; and an outer housing that houses or fixes the rotor and the stator; A rotating member that includes a part or all of the driving mechanism and is supported rotatably around the driving mechanism in accordance with a rotation output of the driving mechanism.
The outer casing includes an intake port for taking in air outside the chamber and an exhaust port for discharging the air inside the outside, and the rotated member includes a plurality of The motor has a fin row formed on the inner wall of the rotated member over the entire circumference, and a plurality of the fin rows are formed at predetermined intervals in the rotation axis direction of the rotated member. apparatus. An axle; a wheel; a rotor that is rotatably supported; a stator that applies rotational torque to the rotor; and an outer casing that is fixed to the axle and accommodates or fixes the rotor and the stator. A drive mechanism section comprising: a speed reduction mechanism section that decelerates the rotational output of the drive mechanism section; and a part or all of the drive mechanism section and the speed reduction mechanism section; A rotating member that is rotatably supported around the drive mechanism unit and the speed reduction mechanism unit according to the rotation output of the drive mechanism unit transmitted via the wheel, and is fixed to the wheel, An electric bicycle comprising: a hub rotatably supported at the axle center;
The outer casing includes an intake port for taking air outside the air into the inside and an exhaust port for discharging air inside the air to the outside, and the hub has a plurality of fins. An electric bicycle having fin rows formed on the inner wall of the hub over the entire circumference, wherein a plurality of fin rows are formed at predetermined intervals in the direction of the rotation axis of the hub .

Images