JP2013023202A - Electric wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the following problems of an existing in-wheel motor having a rotor rotating on an axle and a wheel mounted on the rotor: the weight of the rotor and the weight of the entire wheel including a tire is applied on the axle, and an impact load received from a road surface in traveling is further applied thereto, so that the axle needs to receive a bending load and the impact load and to transmit torque.SOLUTION: This electric wheel is configured so that the position of a motor is moved to the outside of a wheel from the electric wheel using an in-wheel motor, and the weight of a vehicle and an impact load from a load surface in traveling are received by a pipe-like axle holding member 2 instead of an axle 3. The axle is used only for transmission of torque between the motor and the wheel 13.

Description

The present invention relates to an electric wheel mainly used for an electric vehicle, and particularly relates to an electric wheel for a large vehicle such as a bus or a truck having a large load applied to an axle or a small high-performance electric vehicle. It is related to the technology suitable for.

In recent years, development of electric vehicles using in-wheel motors with high mechanical efficiency has been actively promoted. However, the existing in-wheel motor is unsuitable for large vehicles with heavy vehicle weight because of the structure in which the weight of the vehicle and the impact load from the road surface are received by the rotating shaft of the motor.
In addition, the current development of electric vehicles has not gone beyond the scope of experiments, and efforts are being made to improve electrical efficiency. However, the basics include supporting the vehicle weight and receiving impact from the road surface. Development has been delayed with respect to typical functions, and no production cost reduction measures commensurate with reality have been shown.

In an existing in-wheel motor, a rotor rotates on an axle, and a wheel is attached to the rotor. As a result, the weight of the rotor and the weight of the entire wheel including the tire are added to the axle, and an impact load received from the road surface during traveling is also applied. Therefore, it is necessary for the axle to receive a bending load and an impact load and simultaneously transmit the rotational force. Therefore, the following problem occurs.
1. It is necessary to use a high-strength material for the axle, which increases production costs.
2. To secure the strength, the axle becomes thick, the weight increases and the running performance decreases.
3. Impact load during traveling is directly transmitted to the rotor, and the rotor moves finely. Therefore, the gap between the rotor and the stator cannot be reduced, and the motor output cannot be increased.
In order to suppress the fine movement and deformation of the rotor, it is necessary to increase the strength of each member, resulting in an increase in cost and weight.
4. To increase the bending strength with the same weight, it is common knowledge in material mechanics to increase the outer diameter of the shaft and make it into a pipe shape, but the inner diameter of the motor is limited, so the shaft diameter is increased. Can not.
5. When a brake disc or brake drum is installed on the wheel portion, the load on the axle is further increased due to its weight. As a result, costs and weight are also increased.
6. When the function of an electric vehicle is improved, such as an increase in the size of a vehicle, an improvement in braking force due to an increase in brakes, and the ability to run on uneven terrain, the limit is determined by the strength of the axle. That is, the degree of freedom in design is narrow, and the future of electric vehicles is limited.
7. In order to increase the output of the motor, it is best to increase the outer diameter of the rotor. However, since the inner diameter of the wheel is limited, there is a limit to improving the output. If the wheel is made larger, the axle must also be made thicker, and it is inevitable that the running performance will decrease due to the increase in weight. That is, it is impossible to make a small and high-performance electric vehicle that the market demands.
8. If the strength is increased to suppress the deformation of the axle, the shaft will not be elastically deformed, so an impact load will be directly applied to the bearing. As a result, the bearing must also be increased in strength and cost and weight are increased.
9. If the strength around the axle is increased, the unsprung weight increases and the running performance becomes extremely poor.
As a countermeasure, it is necessary to use an expensive shock absorber / suspension with high function, which further increases the production cost.
10. An increase in production costs directly leads to an increase in selling prices, and is a major obstacle to the spread of electric vehicles. In other words, the production cost, assemblability, and functions around the axle must be the same as those of existing gasoline vehicles.
11. Since the increase in weight directly affects the fuel consumption rate, it becomes fatal in an electric vehicle whose main purpose is to improve the efficiency of energy use.
It is an object of the present invention to solve all of the above problems.

The position of the motor is moved out of the wheel from the electric wheel by the in-wheel motor, and the weight of the vehicle and the impact load from the road surface during traveling are received by a member that holds the axle, not the axle. The axle is only used to transmit rotational force between the motor and the wheel.

Since the axle holding member can increase the outer diameter regardless of the inner diameter of the motor, if the pipe is made thin and thick, the bending strength can be drastically improved with the same weight. On the outside, the wheel, tire and brake parts are rotatably held via bearings, so that the structure can sufficiently withstand the increase in vehicle weight and the impact load due to running on rough terrain.
Also, the axle can be made very thin because it only needs to transmit the rotational force of the motor. Furthermore, by making the shaft thinner, it becomes easier to be elastically deformed with respect to bending, so the burden on the bearing is reduced and a small bearing can be used.
Furthermore, by making the motor independent, it becomes possible to seal it, and the dustproof and waterproof properties can be easily improved, and the practicality is dramatically increased.
As described above, the weight is reliably reduced and the cost is also reliably reduced. Furthermore, weight reduction improves vehicle running performance, and weight reduction improves fuel consumption rate.

Any one of the configurations detailed in claims 1 to 13 is adopted.
Specifically, the motor position is moved out of the wheel from the electric wheel by the in-wheel motor, and the weight of the vehicle and the impact load from the road surface during traveling are received by the member that holds the axle, not the axle. To do. The axle is only used to transmit rotational force between the motor and the wheel.
In addition, in order to improve the assemblability, the axle holding member may be divided into a motor mounting part, a vehicle body mounting part, and a wheel mounting part. When a shock absorber is attached or used as a steering wheel, the axle holding part is retained. A suspension or steering device may be attached to the member.
For waterproofing and dustproofing of the motor, cover only the motor, seal it and ventilate it.

Embodiments of the invention are as detailed in claims 1-13. An example is shown below.

FIG. 1 is a cross-sectional view of an electric wheel according to the present invention, which is a schematic diagram for explaining the function and structure of the invention. Therefore, shapes and parts necessary for actual design and production such as brakes, piping and wiring are omitted. Reference numeral 1 denotes an axis of the rotation shaft (axle) 3, and since the figure appears as an object with respect to 1, the lower half is omitted.
The rotating shaft 3 is rotatably supported by a bearing 9 inside the pipe-shaped axle holding member 2. 2, a flange-like wheel mounting member 6 is rotatably held via a bearing 10, and a wheel 13 is fitted to a plurality of bolts 11 attached to 6 and fixed by nuts 12. . A tire 14 is fitted on the outer periphery of 13 to form a wheel.
A rotor 18 of a motor is rotatably held on the left outer peripheral portion of 2 via a bearing 21, and 18 generates a rotational force by a stator 19 attached to the vehicle body 5.
The rotational force generated in the rotor 19 is transmitted to the disc-shaped flange 15 by a plurality of bolts 20, and 15 is attached to the rotary shaft 3 by the key 17 and the bolt 16, so that the rotational force is transmitted to 3. At the right end of 3, the wheel mounting member 6 is mounted with bolts 8 by the spline fitting portion 7, so that the rotational force of the rotor 18 is transmitted to the tire 14 via the rotating shaft 3.
Reference numeral 2 is attached to the vehicle body 5 via a bracket 4.
According to the above configuration, the weight and impact load applied to the wheel are received by the pipe-shaped bearing holding member attached to the vehicle body, and no load is directly applied to the rotating shaft.
If the pipe-shaped axle holding member is divided based on these configurations, the assemblability is improved.
Since the rotating shaft is supported by a single bearing in the vicinity of the center thereof, vibrations, assembly errors, and manufacturing errors can be absorbed. The above is the embodiment according to claims 1 to 5 of the present invention.

FIG. 2 shows a configuration in which the rotor holding method is changed from the configuration of FIG. The pipe-shaped axle holding member is divided into 30 and 33, and a stator 19 is attached to 30. A bearing 31 is press-fitted inside 30 to hold the rotor 32 rotatably. According to this configuration, the rotor and the stator, that is, the motor can be attached and detached by 30 as a set, so that the assemblability is improved. The wheel side may have the same structure, and the bearing may be installed inside 30.
The above are the embodiments according to claims 6 to 7 of the present invention.

FIG. 3 is an embodiment in the case where the electric wheel of the present invention is used as a steering shaft, and is a schematic view seen from above. In the figure, the shaded portion represents a pin coupling portion. The pipe-shaped axle holding member 2 is slidably held by a steering shaft 24 on an arm (link) 23 attached to the vehicle body 22. With this configuration, by operating the steering rod 26 attached to the steering stay 25, the motor 18 and the tire 14 swing and can be steered while being driven. If the motor mounting portion 30 of the pipe-shaped axle holding member divided in claim 6 is fixed to the vehicle body side and the rotary shaft 3 is divided and connected by a universal joint or a constant velocity joint, The moment of inertia is reduced and light steering is possible. Also,
The above are the embodiments according to claims 6 and 8 to 9 of the present invention.

FIG. 4 is a schematic diagram of the state seen from the side of FIG. 3, and represents a configuration including a shock absorber. The steering shaft 24 is mounted on the vehicle body 22 by the upper and lower links 23 and 29 so as to be able to swing up and down. Reference numeral 28 denotes a suspension attached to the upper link 23, which is a shock absorber by a combination of a spring and a damping device using hydraulic pressure or gas pressure. With this configuration, the electric wheel of the present invention can be driven, braked, steered, and buffered. In addition, the hatching part in a figure represents the part connected by the pin like FIG. The caliper of the disc brake may be attached to the steering shaft 24. The above is the embodiment according to claim 10 of the present invention.

FIG. 5 shows a configuration in which the motor is hermetically sealed to prevent damage to the motor due to hopping or water intrusion during traveling. The motor rotor 32 and the stator 19 are covered with a cover 35 having a shape obtained by extending 30 in FIG. In this state, when a dust seal, an oil seal, or a labyrinth seal 34 is provided between the flange-shaped member 6 that supports the wheel and the pipe-shaped axle holding member 33, the rotating shaft 3, the stator 19, the rotor 32, and The space where each bearing is installed is shielded from the outside air and exhibits dustproof and waterproof functions. The electrical wiring 36 such as a motor may be wired by opening a hole in a part of the cover and filling a gap with rubber or silicon. Moreover, since the heat generated from the motor is trapped inside in a sealed state, a duct 37 is provided for ventilation. Since FIG. 5 is a schematic diagram, the cover 35 is shown integrally. However, in consideration of assemblability, the cover 35 is divided into a plurality of parts and fitted and assembled.
The above is the embodiment according to claim 11 of the present invention.

According to the configuration shown in FIGS. 1 to 5, it is possible to arrange the electrical wiring only on the vehicle body side, and it becomes easy to protect the power cord from mud and water during traveling. In addition, it is possible to improve output by connecting motors, which is impossible with in-wheel motors, dramatically improving the functions of electric vehicles, increasing development efficiency, and establishing realistic production specifications.
The above are the embodiments described in claims 12 and 13 of the present invention.

According to the present invention, the strength burden of the motor and the rotating shaft in the electric wheel is drastically reduced, and a realistic production specification of an electric vehicle can be obtained.
In other words, each function required for an electric vehicle such as cost, productivity, assemblability, maximum output, maximum load weight, fuel consumption rate, etc. is secured in a well-balanced manner, and an optimum specification for a mass-produced vehicle is obtained.

It is the figure which represented typically sectional drawing of the electric wheel of this invention goods, and since it is symmetrical with respect to the centerline 1, the lower half is abbreviate | omitted. FIG. 2 is a schematic view in which a pipe-shaped axle holding member is divided with respect to FIG. 1, a rotor holding method is changed, and a motor is detachable. It is the figure which represented typically the upper side figure of the electric wheel with a buffer device and a steering function of this invention. It is the figure which represented typically the side view of the electric wheel with a shock absorber and a steering function of this invention. FIG. 3 is a schematic diagram of a configuration in which a motor is sealed with a case with respect to FIG. 2.

1. Rotating shaft axis 2. Pipe-shaped axle holding member 3. Rotating shaft (axle)
4. Bracket (Connection between pipe-shaped axle holding member and car body)
5, car body 6, flange-shaped wheel mounting member 7, spline fitting part (fitting of wheel mounting member and rotating shaft)
8. Bolt (for fastening wheel mounting member and rotating shaft)
9. Bearing (holds rotating shaft)
10. Bearing (holds wheel mounting member)
11. Bolt (implanted in the wheel mounting member)
12. Nut (for wheel mounting)
13, wheel 14, tire 15, flange (rotating shaft and rotor connecting member)
16, bolt (fastening of housing and rotating shaft)
17, key 18, rotor (outer rotor motor)
19. Stator (outer rotor motor)
20, Bolt (for fastening housing and rotor)
21, bearing (holds the rotor from the inside)
22. Car body (or bracket fixed to the car body)
23, upper link (sliding arm))
24, steering shaft 25, steering stay 26, steering rod 27, pin coupling portion (shaded portions in FIGS. 3 and 4 all represent pin coupling)
28. Suspension (spring and shock absorber)
29, lower link (peristaltic arm))
30 is a part where the pipe-shaped axle holding member is divided, 31 holding the motor, bearing (holding the rotor from the outside)
32, rotor (outer rotor motor)
33, pipe-shaped axle holding member 34, oil seal (or dust seal or labyrinth seal)
35, sealing case 36, electrical wiring 37, ventilation hole (breather hose mounting part)

Claims (13)

An electric wheel characterized in that an axle of a wheel installed substantially horizontally in an electric vehicle is configured as follows. The axle is assumed to be all wheels of an electric vehicle or a predetermined wheel.
1. A rotating shaft serving as an axle is held in a pipe-shaped axle holding member attached to the vehicle body via a bearing or a sliding bearing. The length of the rotating shaft is equal to or greater than or equal to the length of the pipe-shaped axle holding member, and includes a configuration in which oil is forcedly supplied to the rolling portion or the sliding portion.
2. A wheel is rotatably held on the outer periphery of one end of the pipe-shaped axle holding member. That is, the wheel rotates around the outer circumference of the pipe-shaped axle holding member, and receives the vehicle weight applied to the wheel and the impact load received from the road surface during traveling by the pipe-shaped axle holding member.
3. An outer rotor motor is attached to the opposite side of the wheel holding portion of the pipe-shaped axle holding member, and the rotor and the rotary shaft are coupled to transmit the rotational force. The stator of the outer rotor motor is detachably fixed to a pipe-shaped axle holding member, a flange attached to the pipe-shaped axle holding member, or an attachment member.
4. The wheel and the rotating shaft are coupled so that the rotational force of the rotor can be transmitted to the wheel. A tire is fitted on the outer periphery of the wheel.
5. The rotating shaft is a hollow shaft or a solid shaft, the outer diameter is constant, the stepped shaft whose outer diameter changes stepwise, or the shaft whose outer diameter changes smoothly, and a structure in which multiple shafts are connected Including.
6. The pipe-shaped axle holding member is a simple pipe shape with a constant inner / outer diameter, or a stepped pipe with an inner / outer diameter set to a predetermined size in accordance with the mounting of the bearing and the holding device to the vehicle body.
7. A pipe-shaped axle holding member is a conceptual shape. In addition to an independent pipe shape, a configuration in which a through hole is provided in a predetermined part or part of a vehicle body, or a pipe in a predetermined part or part of a vehicle body A configuration in which the rotation shaft can be held by the configuration in which the shape is embedded is also included. The electric wheel according to claim 1, wherein a connection structure between the rotor of the outer rotor motor and the rotating shaft is any of the following.
1. A hole spline provided on the inner periphery of the rotor is fitted to a shaft spline provided near the end of the rotating shaft. In addition, after spline fitting, the structure which prevented the rotor from detaching with a bolt, a nut, or a circlip is included.
2. The rotor was press-fitted into the rotating shaft, or shrink-fitted.
3. A taper shape was provided at or near the end of the rotary shaft, fitted with a taper hole provided in the inner periphery of the rotor, and mutual rotation was prevented with a key or pin. A configuration in which the rotor is prevented from coming off with a bolt, a nut, or a circlip after the taper is fitted is also included.
4. The rotor was rotatably held on the outer periphery of the pipe-shaped axle holding member, and the end of the rotary shaft or the vicinity of the end and the end face of the rotor were detachably attached. In addition, the structure which hold | maintains a rotor rotatably includes a structure which interposes a slide bearing or a bearing, and the attachment of a rotor and a rotating shaft provides a flange with a mounting hole in a rotating shaft, and a bolt or a volt | bolt is attached to the end surface of a rotor. A configuration in which a nut is installed, a key is inserted and fitted between the rotating shaft and the rotor, and a bolt or nut is used to prevent it from coming off, or a disc-shaped mounting member is interposed, so that each of the rotating shaft and the rotor is , Including a configuration in which a bolt or a bolt and a nut are fixed.
5. In the configuration of 4 above, when fixing with bolts or bolts and nuts, by tightening an elastic member made of rubber, resin, or metal spring in between, the rotor is slightly against the rotating shaft Elastically coupled to allow movement. The electric wheel according to claim 1 or 2, wherein the wheel is detachably attached by any of the following configurations.
1. A bearing is installed on the outer periphery of a pipe-shaped axle holding member, and a flange-shaped member provided with a wheel bolt is rotatably mounted on the outside thereof. A shaft spline is provided at or near the end of the rotating shaft and is fitted with a hole spline provided inside the flange-shaped member to transmit the rotational force. The wheel is attached to the flange-shaped member with a wheel nut. Note that the spline fitting portion includes a configuration in which relative rotation is stopped using a key or a pin.
2. A bearing is installed on the outer periphery of the pipe-shaped axle holding member, and a flange-shaped member provided with wheel bolts is rotatably attached to the outside thereof. A flange shape is provided at or near the end of the rotary shaft, and is connected to the flange-shaped member by a bolt or a bolt and a nut. In addition, by elastically interposing rubber, resin, or a metal spring between the coupling portions, the flange-like member was elastically coupled so that it could move slightly with respect to the rotation shaft.
3. In any one of the above configurations 1 and 2, a bearing is attached to the inside of the pipe-shaped axle holding member, and the flange-shaped member is rotatably held by the inner ring or the inner diameter portion of the bearing. The electric wheel according to any one of claims 1 to 3, wherein a braking device is provided on the rotating shaft by any of the following configurations.
1. A brake disc and / or a brake drum was provided between the pipe-shaped axle holding member and the wheel. In addition, the structure which hold | maintains a brake disc or a brake drum rotatably with a bearing or a sliding bearing, and fastened the brake disc or the brake drum and the wheel detachably with a volt | bolt or a nut is also included.
2. A brake disc and / or a brake drum was provided between the pipe-shaped axle holding member and the motor.
3. In the vicinity of the motor, on the opposite side of the wheel, a brake disc and / or brake drum was provided.
4. A brake disc and / or a brake drum was provided near the center of the pipe-shaped axle holding member. 5. The structure according to claim 1, wherein a deformation caused by a manufacturing error or an impact is absorbed by any of the following configurations so that the rotational force of the motor can be smoothly transmitted to the wheel. Electric wheel.
1. The pipe-shaped axle holding member is configured to hold the rotating shaft in the vicinity of the central portion with respect to the length direction, and the rotating shaft can be bent by elastic deformation on both sides or one side of the holding portion. The rotating shaft includes a configuration in which the outer diameter of one side or both sides of the holding portion is reduced, or the thickness of the hollow shaft is reduced to facilitate elastic deformation.
2. The rotating shaft is held in the vicinity of both ends of the pipe-shaped axle holding member in the length direction, and the rotating shaft can be bent between the holding portion and the holding portion by elastic deformation. The rotating shaft includes a configuration in which the outer diameter of the intermediate portion of the rotating shaft is made smaller or the thickness of the hollow shaft is made thinner to facilitate elastic deformation.
3. The rotating shaft was held in the vicinity of both end portions of the pipe-shaped axle holding member in the length direction, and the rotating shaft was divided between the holding portion and the holding portion and connected by a universal joint or a constant velocity joint. A configuration in which the outer diameter of the intermediate portion of the holding portion is reduced or the thickness of the hollow shaft is reduced to facilitate elastic deformation is also included.
4. The rotating shaft is held near both ends of the pipe-shaped axle holding member in the length direction, the rotating shaft is divided between the holding portion and the holding portion, and the left and right rotating shafts are baked by rubber. Connected. In addition, rubber baking refers to a process of bonding rubber by making one side cylindrical and the other rod-shaped, inserting the rod into the cylinder, filling the gap between them and vulcanizing, It is not limited to the combination of a cylinder and a rod, but includes all configurations in which the left and right rotating shafts are connected by vulcanized rubber.
5. Hold the rotating shaft in the vicinity of both ends of the pipe-shaped axle holding member in the length direction, the rotating shaft is divided between the holding portion and the holding portion, and a coil spring or a plate between the left and right rotating shafts They were connected by springs, bar springs, or bellows-like metal tubes.
6. In any one of the configurations 1 to 5 described above, the shaft holding portion is a bearing, and the inner diameter of the inner ring of the bearing is configured to be able to absorb the inclination due to the deflection of the rotating shaft by increasing both ends, or The inner ring has a double structure, and it is configured to be able to absorb the inclination due to the deflection of the rotating shaft by sliding between the two inner rings.
7. By installing rubber, resin, or metal springs on the outer or inner peripheral side of the bearing that holds the rotating shaft, and elastically holding the rotating shaft with respect to the pipe-shaped axle holding member. In addition, the tilt due to the deflection of the rotation shaft can be absorbed. The pipe-shaped axle holding member is divided into a motor attachment portion, a vehicle attachment portion, and a wheel attachment portion, and each is detachably mounted with a bolt or a bolt and a nut. The electric wheel according to any one of 5. In addition, the structure which divided the motor attachment part, the attachment part to a vehicle body, and the wheel attachment part into each plurality and improved the assembly property is also included. The electric wheel according to any one of claims 1 to 6, wherein the rotor of the outer rotor motor is rotatably held by any one of the following configurations.
1. A bearing is installed on the outer periphery of the pipe-shaped axle holding member, and the inner diameter portion of the rotor is held from the inner side by the outer ring of the bearing.
2. A bearing is installed on the inner diameter of the pipe-shaped axle holding member, and the inner diameter portion of the rotor is held from the outside by the inner ring of the bearing. The pipe-shaped axle holding member can be rotated left or right or pivoted about the axle rotation axis, that is, the steering axis, tilted in the range of up to 45 degrees from substantially vertical, or from substantially vertical to the front-rear and left-right direction of the vehicle body. The steerable electric wheel according to any one of claims 1 to 7, wherein the steerable electric wheel is configured. Note that the configuration that allows rotation or swinging refers to a device that supports a pipe-shaped axle holding member on its upper side, its lower side, its upper and lower sides, or its end portion so that it can rotate substantially horizontally. The rotating portion includes a configuration including a bearing, a sliding bearing, or a ball joint, and a configuration in which a steering rod is attached to a movable portion that rotates horizontally. 7. The structure according to claim 6, wherein a portion of the divided pipe-shaped axle holding member to which the outer rotor motor is attached is attached to the vehicle body or a bracket attached to the vehicle body, and the rotating shaft is divided into a plurality of parts. The electric wheel according to claim 8, wherein only the wheel side is moved up and down by a configuration that is connected by a universal joint or a constant velocity joint. The electric wheel according to any one of claims 1 to 9, wherein the wheel is configured to be vertically movable and has a buffer function by any of the following configurations. In addition, in the following configurations, a configuration in which a through hole for fastening is provided in the outer peripheral portion or end surface portion of the pipe-shaped axle holding member, or a bracket in which a through hole or screw hole for fastening is provided in the outer peripheral portion or end surface portion. Including a configuration in which a screw is attached, a configuration in which a screw is directly provided on the outer peripheral portion, and a configuration in which the outer diameter is stepped and press-fitted or fitted.
1. An arm is attached to a pipe-shaped axle holding member, and an end of the arm is pin-coupled to a vehicle body or a bracket attached to the vehicle body so that the arm can be pivoted, and a pipe-shaped axle holding member, or A shock absorber was installed in the vicinity or between the arm and the vehicle body or a bracket fixed to the vehicle body. The shock absorber refers to a device that supports the vehicle weight by a metal spring and attenuates vibrations by liquid pressure or gas pressure.
2. A plurality of link members are slidably pin-coupled instead of the arms to the configuration of 1 above, and a pipe-shaped axle holding member is supported. In addition, the elastic coupling | bonding which made the attachment part of an arm or a link member interpose rubber, resin, or a metal elastic member is also included.
3. With respect to the configuration of 1 above, two oval holes arranged in parallel instead of the arm are provided, and a pipe-shaped axle holding member is fitted into the hole and slid along the length direction of the oval. The device was movable.
4. A bracket in which one end of a so-called telescopic suspension device is attached to a vehicle body or a vehicle body, in which an inner cylinder and an outer tube having different thicknesses are combined to be freely stretchable and a coil spring and shock absorbing oil or high-pressure gas are enclosed inside The other end was attached to a pipe-shaped axle holding member. The attachment includes fastening by bolts or bolts and nuts, and includes elastic coupling in which an elastic member made of rubber, resin, or metal is interposed in the attachment portion.
5. The telescopic suspension of 4 above was attached to the above 1 or 2 arm or link.
6. A plate spring was installed substantially horizontally on the vehicle body or a bracket attached to the vehicle body, and a pipe-shaped axle holding member was attached to a substantially central portion of the plate spring. The outer rotor is housed in a hermetically sealed container that can be disassembled and opened, and a sealing seal is provided on the rotating shaft. The electrical wiring take-out part is sealed with removable rubber, resin, or silicon, and one of the following: The electric wheel according to any one of claims 1 to 10, which has all or characteristics.
1. A pipe or hose that communicates the internal space of the container and the outside air was installed, and the end on the outside air side was above the rotating shaft of the motor. In addition, the structure which forcibly ventilates the inside of the container by using a flow of air by rotation of the motor, attaching a fan to the motor, or providing a dedicated electric fan is also included.
2. A water jacket was installed in the container, and the motor was water-cooled or liquid-cooled by a configuration in which a cooling water hose was piped outside the container.
3. An amphibious vehicle was prepared by attaching a water wheel to a wheel fitted with a tire or attaching a screw. The rotational speed sensor of the rotating shaft, the torque sensor of the rotating shaft, the temperature sensor of the motor, and the electric wiring for the motor are installed only on the motor side from the vicinity of the center of the pipe-shaped axle holding member in the length direction. The electric wheel according to claim 1, characterized in that: In addition, the rotational speed sensor of a rotating shaft, the torque sensor of a rotating shaft, and the temperature sensor of a motor include the structure which does not provide either. The configuration according to any one of claims 1 to 12, wherein the electric wheel has any of the following characteristics.
1. The outer rotor motor was replaced with an inner rotor motor.
2. A plurality of outer rotor motors were connected in series.
3. A plurality of inner rotor motors were connected in series.
4. The outer rotor motor and the inner rotor motor were connected in series.

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