JP2001010487A - Cooling structure for independent wheel drive component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively cool an electric motor provided on an independent wheel drive component for rolling stock. SOLUTION: Four independent wheel drive components 101 are mounted on the truck frame 102 of an independent wheel steering truck 100 for rolling stock. Each independent wheel drive component 101 is of a component structure in which wheels 104 are freely rotatably positioned on the outer periphery of an electric motor 103 and the torque of the electric motor 103 is decelerated by a speed reducer and transmitted to the wheels 104. Fans 130 are provided on the right and left frames 102a of the truck frame 102, and air fed by the fans 130 passes through a wind tunnel 131 formed within each frame 102a and is forced into the electric motor 103 via a feed port formed in the motor frame of the electric motor 103 and is exhausted from an exhaust port formed in the end face of the electric motor 103. Thus, the electric motor 103 is forcibly air cooled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure for an independent wheel drive component for a railway vehicle, and more particularly to an air motor for an electric motor incorporated in the independent wheel drive component.

[0002]

2. Description of the Related Art Many power bogies for railway vehicles at present employ integrated wheels in which a right wheel and a left wheel are connected to each other by an axle. The vehicle is decelerated by the reduction gear and transmitted to the integrated wheels to travel. When traveling on a curved track, curved traveling is possible by a self-steering effect using the gradient of the tread surface of the wheel.

On the other hand, recently, independent wheel bogies have been developed in order to adopt a low-floor structure in which the floor surface of a railway vehicle is lowered. In this independent wheel bogie, the axle is omitted, the right wheel and the left wheel are configured to rotate individually and independently, and each wheel is driven by an individual electric motor.
Since the independent wheel bogie has no axle, even if the floor surface of the railway vehicle is lowered, the floor surface does not interfere with the axle, and the floor can be lowered. In a low-floor type railway vehicle, convenience can be improved because the user can step in and out of the track surface steplessly.

[0004] In such an independent wheel truck, a hub motor type independent wheel drive component may be employed. In this independent wheel drive component, wheels are arranged on the outer peripheral side of the motor, and the rotational force of the motor is transmitted to the wheels via a speed reducer. The component in which the motor, the wheel, and the speed reducer are integrated It has a structure.

In a bogie-type independent wheel truck having four wheels on a single truck, four independent wheel drive components are mounted on one truck. That is, two independent wheel drive components are mounted on the right frame of the bogie frame, and two independent wheel drive components are mounted on the left frame of the bogie frame. This bogie bogie type independent wheel bogie is compared with a single axis type independent wheel bogie,
Even if wheel slip occurs, there is no danger of derailing, and
There is an advantage that stability at high speed running is high.

Here, a specific example of a conventional hub motor type independent wheel drive component will be described. As shown in FIG. 8, in the conventional independent wheel drive component 10, the rotational force of the electric motor 11 is transmitted to the speed reducer 12 via the electric motor shaft 11a and is reduced, and the reduced rotational force is transmitted to the wheel housing 1.
3 is transmitted. The wheel housing 13 is rotatably arranged on the outer peripheral side of the motor frame 11b. A wheel 15 is mounted on an outer peripheral surface of the wheel housing 13 via an elastic member 14. The elastic member 14 is annularly arranged along the circumferential direction, and suppresses wheel vibration while rotating with the wheel 15.

Further, the hub support arms 16, 16 and the bearing 1
7, 17 are configured as a pair up and down,
The upper and lower pins (not shown) fixed to the hub support arm 16 and the bearing 17 penetrate from above and below. For this reason, the entire independent wheel drive component 10 can be steered around the hub support arm 16 and the bearing 17 as a turning center. Reference numeral 18 denotes a brake.

[0008]

By the way, in the prior art shown in FIG. 8, the outer peripheral surface of the motor frame 11b of the electric motor 11 is surrounded by a rotating wheel housing 13, and a speed reducer is provided on the left end surface side of the electric motor 11. 12 and the hub support arm 16 and the like are disposed on the right end face side of the electric motor 11, so that cooling air cannot be supplied from the outside to the inside of the electric motor 11, so that the electric motor 11 is forcibly air-cooled. Could not. The peripheral surface of the electric motor 11 is
The traveling wind is surrounded by the motor frame 11.
The heat radiation was poor because it did not hit b. For this reason, the electric motor 11 could not be effectively cooled.

In view of the above prior art, an object of the present invention is to provide a cooling structure for an independent wheel drive component that can effectively cool a motor incorporated in the independent wheel drive component.

[0010]

According to the structure of the present invention, which solves the above-mentioned problems, wheels are rotatably arranged on the outer peripheral side of an electric motor, and the rotational force of the electric motor is reduced by a reducer fixed to the electric motor. In a bogie for a railway vehicle in which independent wheel drive components transmitting to wheels are arranged on the left and right sides of a bogie frame, a frame of the bogie frame is hollow to form an air path inside the frame, and air is blown into the air path. A fan is installed on the frame, and further, an air supply port for taking in air that has passed through the air passage into the motor is formed in the motor frame, and an exhaust port is formed on an end face of the motor. .

[0011] Further, according to the present invention, two independent wheel drive components and one fan are provided on the right frame of the bogie frame, and two independent wheel drive components and one fan are provided on the left frame of the bogie frame. It is characterized by having.

Further, in the configuration of the present invention, a plurality of the supply ports are formed along a circumferential direction of the motor frame.

Further, according to the present invention, the independent wheel drive component includes a motor fixed to the bogie frame, a speed reducer fixed to an end face of the motor to reduce the rotation of the motor, wheels, A power transmission member for transmitting the output of the machine to the wheels is integrally incorporated and configured, and furthermore, a steering plate is arranged on the outer peripheral side of the motor frame of the electric motor so as to be capable of turning in a horizontal plane, The wheel is rotatably supported on the outer peripheral surface of the steering plate via a rolling bearing, and the upper peripheral space portion and the lower peripheral space portion of the space between the inner peripheral surface of the steering plate and the outer peripheral surface of the motor frame. It is characterized in that the elastic member is press-fitted and interposed.

Further, in the configuration of the present invention, an exhaust port is formed on an end face of the electric motor opposite to the end face on which the speed reducer is fixedly arranged.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

<Description of Overall Structure of Vehicle> First, an example of a railway vehicle using the cooling structure of an independent wheel drive component of the present invention will be described with reference to FIG. FIG.
As shown in FIG. 1, in the railway vehicle of this example, one independent wheel steering bogie 100 is attached to one vehicle body 1. The vehicle body 1 on the front side and the vehicle body 1 on the rear side are connected by a coupler 2 of a spherical bearing type. The independent wheel steering bogie 100 is a bogie bogie type bogie having four independent wheel drive components 101 on one bogie.

When traveling on a curved track, the front vehicle body 1 and the rear vehicle body 1 are bent at the coupler 2 so that the independent wheel steering bogie 10
0 has a structure that hardly turns (yaw rotation). In other words, the moving center plate mechanism has a bogie rotation displacement angle of substantially zero. For this reason, when traveling on a normal circular orbit, the vehicle can travel on a curved orbit with the bogie rotational displacement angle being zero by bending at the coupler 2. In the case of an S-shaped curved trajectory, a slight bogie rotation displacement angle occurs and the vehicle travels on the curved trajectory.

Further, although the detailed structure will be described later, each wheel of the independent wheel drive component 101 provided in the independent wheel steering bogie 100 is steered only once or twice to improve the turning performance by performing perfect steering on a curved track. You can turn. Moreover, the structure of the motor and the speed reducer of the independent wheel drive component 101 are devised so that only the wheels can be turned without steering. In addition, a device is devised to reduce the moment of inertia of the rotating portion, improve the rotation followability, and improve the response of the rotation speed control.

<Description of Independent Wheel Steering Truck> Next, the independent wheel steering truck 100 will be described. As shown in FIG. 2, four independent wheel drive components 101 are attached to a bogie frame 102 of the independent wheel steering bogie 100. That is, the two independent wheel drive components 101 are attached to the right frame 102a of the bogie frame 102 so as to be shifted in the front-rear direction, and the left frame 10
Two independent wheel drive components 101 are attached to 2a so as to be shifted in the front-rear direction.

In each of the independent wheel drive components 101, wheels 104 are rotatably arranged on the outer peripheral side of the electric motor 103, and the rotational force of the electric motor 103 is transmitted to the wheels 104 via a reduction gear (not shown in FIG. 2). It has a component structure in which the electric motor 103, the wheels 104, the speed reducer, and the like are integrated.

The details will be described again in the section of “Description of Independent Wheel Drive Component” which will be described later.
The turning center pin 105 is used as a wheel yawing rotation center (steering turning center) so that the steering can be turned only once or twice. In addition, the steering plate 106 is configured to perform a steering turn with the steering turn of the wheel 104. The left and right steering plates 106 are connected by a steering arm 106a and a steering link 107. As a result, the steering turning angles of the left and right wheels 104 become the same. In addition, the electric motor 103 and the speed reducer are fixed to the bogie frame 102, and do not turn the steering wheel.

In the independent wheel steering bogie 100, the wheels 1
Since the vehicle turns on the steering wheel 04, even when traveling on a steep small-curve trajectory with a small turning radius, it is possible to perform a stable steering by performing perfect steering.

<Description of Independent Wheel Drive Component> Next, the independent wheel drive component 101 will be described. In general, the independent wheel drive component 101 includes an electric motor 103, a speed reducer 108, a disc brake 109, a drive shaft 111 and a flexure, as shown in FIG. Board 1
A power transmission member such as 12 or 113, a wheel 104, and a steering permission member such as an elastic member 116 or a steering plate 106 are used as main members, and a component structure is formed by integrally assembling these members. This independent wheel drive component 101 is mounted on a bogie frame 102.

The rotational force of the motor 103 is reduced by the speed reducer 108 and transmitted to the wheels 104 via the flexible plate 112, the drive shaft 111 and the flexible plate 113, and
04 rotates. When the vehicle runs on a curve, the elastic member 116 is elastically deformed to allow the wheel 104 to turn around the turning center pin 105 as the turning center (details will be described later). The motor 103, the speed reducer 108, and the like do not turn the steering wheel.

In the following, the independent wheel drive component 10
The detailed structure, operation, and operation of each part of 1 will be described.

As shown in FIG. 3, a stator core 103b is arranged on an inner peripheral surface of a motor frame 103a of the motor 103, and a rotor core 103c is connected to a motor shaft 103d.
It is provided in. The motor shaft 103d is a hollow pipe shaft, and both ends are rotatably supported by a rotating shaft 103e.

The speed reducer 108 is fixedly arranged on one end face of the electric motor 103 (the left end face in FIG. 3). The speed reducer 108 has a planetary gear mechanism built in a speed reducer case 108a. That is, the carrier 108b is rotatably supported by the bearing 108c, and the planetary gear 108d is attached to the carrier 108b via the bearing 108e. Planetary gear 108d
Meshes with a sun gear 108f fixed to the electric motor shaft 104d and also meshes with an internal gear 108g fixed on the inner peripheral surface of the speed reducer case 108a.

The planetary speed reducer 108 has a larger reduction ratio than the star type planetary speed reducer. Therefore, a high-speed motor can be used as the motor 103. Since the high-speed electric motor is small, it can contribute to miniaturization of the independent wheel drive component 101.
Also, since a small motor 103 can be adopted,
The inertia moment of the rotating part can be reduced, and the response of the rotation control can be improved.

The disc brake 109 is disposed on one end side (the left end side in FIG. 3) of the electric motor 103 via a brake bracket 109a. The disc brake 109 is disposed outside the electric motor 103. The brake disc 109b of the disc brake 109 is formed so as to be connected to the carrier 108b of the speed reducer 108.

The motor 103, the speed reducer 108 and the disc brake 109 are connected to the bogie frame 10 by bolts 110.
2

The drive shaft 111 is connected to the motor shaft 10.
It is arranged inside 3d in an inserted state. A flange 111a is fixed to one end (the left end in FIG. 3) of the drive shaft 111. This flange 111a
Is connected to the brake disc 109b via a flexible plate 112 which is a displacement absorbing member.

A drive shaft arm 111b is formed on the other end side (right end side in FIG. 3) of the drive shaft 111, as shown in FIG. 4 (viewed in the direction of arrow IV in FIG. 2). The drive shaft arm 111b is connected to the wheel 104 via a flexible plate 113 serving as a displacement absorbing member.

With the above configuration, the motor 103
Is transmitted to the wheel 104 via the member of the motor shaft 103d → the reduction gear 108 → the brake disk 109b → the flexible plate 112 → the drive shaft 111 → the flexible plate 113, and the wheel 104 rotates. The braking force generated by the disc brake 109 is applied to the brake disc 1
09b → flexible plate 112 → drive shaft 111 → flexible plate 113 is transmitted to the wheel 104 to brake the wheel 104.

As described above, the motor shaft 103d
Is a hollow pipe shaft, and a drive shaft 1
Because of the structure in which 11 is arranged, the radius of the rotating portion is reduced as a whole, and the moment of inertia of the rotating portion can be reduced. Therefore, the responsiveness of the rotation speed control can be improved.

Further, since the two flexible plates 112 and 113 are employed, the driving force can be transmitted by absorbing the vertical displacement, the lateral displacement and the steering angular displacement of the wheel 104 without difficulty.

On the other hand, a steering plate 106 is arranged on the outer peripheral side of the motor frame 103a. The steering plate 106 is connected to a turning center pin 105 via a rubber bush 114 so that the steering can be turned in a horizontal plane around the turning center pin 105 as a turning center. In this example, the turning center pin 105 is fixed to the motor frame 103a so as to be disposed inside the wheel 104 in the axial direction of the wheel 104.

The outer peripheral surface of the steering plate 106 and the wheels 10
4, a rolling bearing 115 is interposed. That is, the wheels 104 are rotatably supported on the outer peripheral surface of the steering plate 106 via the rolling bearings 115. Therefore, the wheel 104 can rotate and the wheel 1 can rotate.
The rolling support 115, the rolling bearing 115 and the steering plate 106 can be integrated to perform steering turning about the turning center pin 105 as a turning center. A steering arm 106a is integrally attached to the steering plate 106.

An elastic member 116 is press-fitted and interposed between the inner peripheral surface of the steering plate 106 and the outer peripheral surface of the motor frame 103a. As shown in FIG. 4, the elastic members 116 are arranged in an upper peripheral space portion and a lower peripheral space portion of the space between the inner peripheral surface of the steering plate 106 and the outer peripheral surface of the motor frame 103a. , Are not arranged in the front space portion and the rear space portion.

The elastic member 116 receives a compressive load caused by vertical vibration transmitted from the wheel 104 to the electric motor 103, and compresses and expands to suppress vibration. This elastic member 116
Does not rotate, so that a repeated load due to rotation does not act, and the durability of the elastic member 116 is improved.

The left-right vibration generated on the wheel 104 is transmitted to the rubber bush 114 via the rolling bearing 115 and the steering plate 106, and the rubber bush 11
4 damped.

When the vehicle travels on a curved track, an external force is applied to the wheels 104 from the track side, and the wheels 104 perform steering turning. At this time, the rolling bearing 11 together with the wheel 104
The steering wheel 5 and the steering plate 106 also turn.
The elastic member 116 is provided between the steering plate 106 which is to be turned and the motor frame 10 which is not to be turned.
3a, the wheel 104a is elastically deformed (torsional displacement) when the wheel 104a turns. As described above, the elastic deformation of the elastic member 116 allows the wheel 104 to perform steering turning only once or twice.

In the space between the inner peripheral surface of the steering plate 106 and the outer peripheral surface of the motor frame 103a, no elastic member is disposed in the front space portion and the rear space portion, and therefore, the wheels 104a are not provided. When turning the steering wheel,
The elastic deformation of the elastic member 116 becomes possible. If an elastic member is press-fitted and interposed on the entire periphery of the space between the inner peripheral surface of the steering plate 106 and the outer peripheral surface of the motor frame 103a, the torsional deformation hardly occurs, and the steering turning of the wheel 104 becomes impossible. It will be possible.

As described above, the elastic deformation of the elastic member 116 allows the steering of the wheel 104 to be turned. At this time, when the wheel 104 attempts to turn the steering wheel, the elastic member 116 generates a damping action for suppressing the steering rotation. Also, 1-2
A restoring force is applied to the wheel 104 for returning the wheel 104 to the original position (the position where the steering angle is zero). As described above, since the elastic member 116 gives a damping action and a restoring action to the steering turning of the wheel 104, the steering operation is stabilized, and stable running at high speed running can be realized.

Further, as shown in FIG. 2, the steering arm 106a integrally attached to the right steering plate 106 and the steering arm 106a integrally attached to the left steering plate 106,
Since they are connected by the steering link 107 so that the steering turning angles of the left and right steering plates 106 and the steering angles of the left and right wheels 104 are matched, the high-speed stability performance is further enhanced.

Further, since the steering of the wheels 104 can be turned by the elastic deformation of the elastic member 116, the electric motor 103, the speed reducer 108, etc. can be fixedly installed on the bogie frame 102, and the number of components for turning the steering is reduced. And the number of components can be reduced. As a result, steering inertia is reduced,
Good steering running is possible. Further, since the number of constituent members is reduced, there is no portion protruding toward the vehicle interior, and the width of the passage in the vehicle interior can be increased.

Eventually, the elastic member 116 has a function of protecting the motor 103 by damping the vertical vibration transmitted from the wheel 104 to the motor 103 side, a function of elastically deforming the wheel 104 and allowing a steering turn of the wheel 104, It has both a function of giving a damping action when the steering wheel 104 turns and a function of giving a restoring force to return the wheel 104 that has turned the steering wheel to its original position.

<Description of Parking Brake> Next, the parking brake 120 provided in the independent wheel drive component 101 will be described. The lining disk 120a of the parking brake 120 is connected to the carrier 108b by a spline or the like.
And rotates synchronously with the carrier 108a and is slidable in the axial direction. One end face (left end face) of the lining disc 120a contacts the inner wall of the speed reducer case 108a, and the other end face (right end face) has a disc plate 120a.
b is fixed. The back plate 120c is fixedly installed on the inner peripheral surface of the reduction gear case 108a. The piston 120d is disposed so as to be slidable in the axial direction, and has a brake spring 120e provided in the internal gear 108g.
Urged toward the lining disk 120a.

The air supply pipe 120f has a solenoid valve 120g.
Is interposed. The solenoid valve 120g is demagnetized and closed when parked, and is energized and opened when not parked. When the solenoid valve 120g is opened, compressed air is supplied between the piston 120d and the back plate 120c via the air supply pipe 120f.

When the vehicle is not parked, the solenoid valve 120g is opened, and the compressed air flows between the piston 120d and the back plate 12g.
0c, the piston 120d is pushed to the internal gear 108g side by air pressure, and the brake spring 12
Overcomes the spring force of 0e and contacts the internal gear 108g.
Therefore, the piston 120d is connected to the disc plate 120b.
Move away from As a result, the parking brake enters a non-braking state.

When parking, the solenoid valve 120g is closed, and the compressed air between the piston 120d and the back plate 120c escapes, so that the piston 120d is moved by the disc spring 120e by the spring force of the brake spring 120e.
Side and contact the disk plate 120b. For this reason, the piston 120d presses the lining disk 120a via the disk plate 120b to generate a braking force due to frictional resistance, and the parking brake enters a braking state.

The parking brake 120 does not perform a braking operation when the vehicle is traveling, but performs a braking operation when the vehicle is parked. When an emergency situation requiring an emergency brake occurs, the braking operation of the parking brake 120 may be added in addition to the normal brake (such as the disc brake 109).

The parking brake 120 is, as described above,
Since it is arranged in the speed reducer 108, no special installation space is required for the parking brake 120, and the space is saved. Further, since the parking brake 120 is disposed in the lubricating oil of the speed reducer 108, the operation (sliding operation) is smooth, and rust does not occur and the reliability is high.

<Description of Cooling Structure> Next, the cooling structure will be described. As shown in FIG. 2, fans 130 are respectively installed at the central portions of the left and right frames 102 a of the bogie frame 102. The left and right frames 102a are hollow, and have air passages 131 formed therein as shown in FIGS. Moreover, as shown in FIG. 5 (a view taken in the direction of arrow V in FIG. 2), the front and rear ends of the frame 102a are
The motor 103 is curved so as to cover the upper peripheral surface of the motor frame 103a. That is, the air passage 131 is arranged so as to cover the upper peripheral surface of the motor frame 103a.

As shown in FIGS. 3 and 6, a plurality of air supply ports 132 are formed on the upper peripheral surface of the motor frame 103a along the circumferential direction of the motor frame 103a. Also, as shown in FIG. 3, the end face (bracket) of the electric motor 103
Among them, an exhaust port 133 is formed on the end face opposite to the end face where the speed reducer 108 is arranged. Since the exhaust port 133 faces toward the passenger compartment, there is no possibility that raindrops or the like enter the exhaust port 133. Also, reducer 108
Since the disc brake 109 and the disc brake 109 are located on the outside (the side opposite to the cabin), the speed reducer 108 and the disc brake 10
9 is easily hit by the traveling wind, and the natural cooling of the speed reducer 108 and the disc brake 109 is favorably performed.

The air sent from the fan 130 passes through the air passage 131 and is blown into the motor 103 from the air supply port 132. The air taken in from the air supply port 132 flows through the electric motor 103 and is exhausted to the outside through the exhaust port 133. Thus, since the air is forcibly circulated in the electric motor 103, the electric motor 103 can be effectively and forcibly cooled with air. Moreover, since a plurality of air supply ports 132 are formed in the circumferential direction of the motor frame 103a, air can be effectively and uniformly fed to each part of the electric motor 103, and the cooling efficiency is increased.

Further, since the running wind directly hits the outer peripheral surface of the motor frame 103a, the heat dissipation of the motor 103 is good, and the heat dissipation cooling of the motor can be effectively performed. That is, since the outer peripheral surface of the outer peripheral surface of the motor frame 103a except for the portion where the elastic member 116 is disposed is exposed and comes into contact with the outside air, the traveling wind hits the motor frame 103a and the electric motor 103 Is naturally cooled.

As shown in FIG. 2, the independent wheel steering bogie 100 includes four independent wheel drive components 101.
However, since only two fans 130 need to be installed, the configuration can be simplified. That is, since the left and right frames 102a are used as the air passage 131, the air sent by one fan 130 is branched into two by the air passage 131, and the air is supplied to the two electric motors 103. You can.

<Modification of Independent Wheel Steering Dolly> Next, a modification of the independent wheel steering bogie will be described with reference to FIG. As shown in FIG. 7, in this example, the turning center pin 105 is fixed to the motor frame 103a so as to be disposed outside the wheel 104 in the axial direction of the wheel 104. Therefore, the steering can be turned around the turning center pin 105.

The structure of the other parts is the same as the example shown in FIG. That is, the only difference is whether the pivot center pin 105 is disposed inside the wheel 104 in the axial direction (the example in FIG. 2) or outside (the example in FIG. 7) in the axial direction. The same is true. In any case, the steering arm 10 attached to the wheels 104 and the steering plate 106
It is sufficient that the steering link 6a and the steering link 107 form a steering linkage for returning the steered wheel 104 to the track center side.

[0060]

According to the present invention, the wheels are rotatably arranged on the outer peripheral side of the electric motor, and the rotational force of the electric motor is reduced by the reducer fixed to the electric motor. In a bogie for a railway vehicle, in which independent wheel drive components transmitting to the wheels are arranged on the left and right sides of the bogie frame, the bogie frame is hollow and a wind path is formed inside the frame, and air is blown into the wind path. A fan for feeding is installed on the frame, and an air supply port for taking in air that has passed through the air path into the motor is formed in the motor frame, and an exhaust port is formed on an end face of the motor.

With this configuration, according to the present invention, air can be cooled by forcibly flowing air through the motor, and the cooling effect of the motor can be enhanced.
The motor and independent wheel drive components can be downsized.

According to the present invention, the right frame of the bogie frame includes two independent wheel drive components and one fan, and the left frame of the bogie frame includes two independent wheel drive components and one fan. Configuration.

With this configuration, the present invention provides
The two fans can supply air to the two motors, and the cooling structure can be simplified.

In the present invention, a plurality of the supply ports are formed along a circumferential direction of the motor frame.

According to the present invention, air can be uniformly blown into the motor, so that the cooling efficiency is improved.

Also, in the present invention, the independent wheel drive component includes a motor fixed to the bogie frame, a speed reducer fixed to an end face of the motor to reduce the rotation of the motor, wheels, and wheels of the speed reducer. A power transmission member for transmitting output to the wheels is integrally incorporated, and furthermore, on the outer peripheral side of a motor frame of the electric motor,
A steering plate is disposed so as to be able to turn the steering in a horizontal plane, and the wheels are rotatably supported on the outer peripheral surface of the steering plate via rolling bearings, and between the inner peripheral surface of the steering plate and the outer peripheral surface of the motor frame. Elastic members are press-fitted and interposed in the upper peripheral space and the lower peripheral space.

With this configuration, it is possible to effectively cool an independent wheel drive component in which only the wheels are steered.

According to the present invention, of the end faces of the motor, the end face opposite to the end face on which the speed reducer is fixedly arranged is provided.
An exhaust port was formed.

[0069] With this configuration, it is possible to achieve a configuration with no waste, and it is possible to prevent raindrops and the like from entering the motor through the exhaust port.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an example of a railway vehicle to which the present invention is applied.

FIG. 2 is a plan view showing an independent wheel steering bogie according to the present invention.

FIG. 3 is a cross-sectional view illustrating an independent wheel drive component of the present invention.

FIG. 4 is an end view showing the independent wheel drive component of the present invention.

FIG. 5 is a configuration diagram showing an end of a bogie frame.

FIG. 6 is a configuration diagram showing an independent wheel drive component and a cooling structure.

FIG. 7 is a plan view showing another example of the independent wheel steering bogie of the present invention.

FIG. 8 is a configuration diagram showing a conventional independent wheel drive component.

[Explanation of symbols]

 Reference Signs List 1 vehicle body 2 coupler 100 independent wheel steering bogie 101 independent wheel drive component 102 bogie frame 102a frame 103 electric motor 103a motor frame 103d electric motor shaft 104 wheel 105 turning center pin 106 steering plate 106a steering arm 107 steering link 108 reduction gear 109 disk brake 110 Bolt 111 Drive shaft 112, 113 Flexible plate 114 Rubber bush 115 Rolling bearing 116 Elastic member 120 Parking brake 130 Fan 131 Wind path 132 Supply port 133 Exhaust port

Claims (5)

[Claims] 1. An independent wheel drive component that rotatably arranges wheels on the outer peripheral side of an electric motor and that reduces the rotational force of the electric motor by a reducer fixedly arranged on the electric motor and transmits the reduced torque to the wheels, on the left and right sides of the bogie frame. In the arranged bogie for a railway vehicle, an air path is formed inside the frame by making the frame of the bogie frame hollow, and a fan for sending air into the air path is installed on the frame. A cooling structure for an independent wheel drive component, wherein an air supply port for taking in incoming air into the motor is formed in the motor frame, and an exhaust port is formed on an end face of the motor. 2. The vehicle of claim 1, wherein the right frame of the bogie frame has two independent wheel drive components and one fan, and the left frame of the bogie frame has two independent wheel drive components and one fan. The cooling structure for an independent wheel drive component according to claim 1, wherein: 3. The cooling structure for an independent wheel drive component according to claim 1, wherein a plurality of the supply ports are formed along a circumferential direction of the motor frame. 4. The independent wheel drive component includes: an electric motor fixed to the bogie frame; a reducer fixed to an end face of the electric motor to reduce rotation of the electric motor;
A power transmission member for transmitting the output of the speed reducer to the wheels is integrally incorporated, and a steering plate is arranged on the outer peripheral side of the motor frame of the electric motor so as to be capable of turning in a horizontal plane. The wheel is rotatably supported on the outer peripheral surface of the steering plate via a rolling bearing, and the upper peripheral space portion and the lower peripheral space of the space between the inner peripheral surface of the steering plate and the outer peripheral surface of the motor frame. 4. The cooling structure for an independent wheel drive component according to claim 1, wherein an elastic member is press-fitted and interposed in the portion. 5. The cooling structure for an independent wheel drive component according to claim 4, wherein an exhaust port is formed in an end face of the electric motor opposite to an end face on which the speed reducer is fixedly arranged. .