JP3181835B2 - Wheel integrated motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel-integrated motor for a railway vehicle, and more particularly to a cooling structure for the wheel-integrated motor.

[0002]

2. Description of the Related Art As a prior art of a wheel-integrated electric motor that cools using cooling water, European Patent Office Publication No. 0623 is known.
988A2. The cooling mechanism of this technique is provided with a cooling hole through which cooling water flows in an axle that rotatably supports an outer rotor, and cools a stator that is directly fixed in a face-to-face contact with the axle. Further, the cooling mechanism of the wheel-integrated electric motor disclosed in Japanese Patent Application Laid-Open No. 7-9993 is configured to air-cool a stator core, a bearing, and the like, which are fixedly in contact with an axle outer cylinder.

[0003]

However, the former of the prior art has a structure in which the stator and the rotor are directly supported on the axle, and the maintenance is performed with the stator or the rotor attached to the axle. There are difficulties in the work because they are disassembled and maintained separately from the axle. In addition, there are difficulties in processing the cooling holes of the axle and assembling properties as a cooling mechanism. In the latter case, the productivity is good, but the air-cooling method is used, and there is a problem in infiltration and accumulation of dust, and there is a problem in maintainability.

Accordingly, it is an object of the present invention to provide a wheel-integrated motor in which cooling performance is improved while maintaining good maintainability and good productivity.

[0005]

A wheel-integrated electric motor which achieves the above object has a cylinder fitted on the outer periphery of an axle, a wheel rotatably supported on the outer periphery of the cylinder, and a wheel rotatable on the outer periphery of the cylinder. In the wheel-integrated electric motor, comprising a rotor rotatably driving the wheels connected and supported by the rotor , and a stator disposed close to the inside of the rotor, the inside of the cylinder is cooled.
A passage is provided and fitted around the outer periphery of the cylinder and
A cooling jacket fitted to the inner surface of the stator
The cooling jacket is provided inside the cylinder.
A plurality of cooling passages communicating with the cooling passages are provided inside the cooling passages .

[0006] Then, site to be cooled before the Symbol stator,
Desirably, the rotor and the cylinder are hermetically sealed.

According to the present invention, the cooling passage can be arranged finely in the cylinder or the cooling jacket, the cooling efficiency is good, and the working and repair work of the cooling passage and the like can be performed in a separate process. Since the motor portion has a hermetic structure and the motor portion does not come into contact with the outside air and has improved dust resistance, a wheel-integrated motor that is easy to produce and maintain is provided.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial sectional view showing a wheel-integrated electric motor according to one embodiment of the present invention. In the figure, a cross section of the upper left half of the motor with integrated wheels is drawn, and its schematic configuration is shown. In FIG. 1, the basic structure of the wheel-integrated electric motor includes a cylinder 2 fitted on the outer periphery of an axle 1 having a cooling water passage 12 therein and supporting a vehicle body (not shown) in a non-rotating state. A wheel 3 rotatably supported via a bearing 5 fitted to one end of the outer periphery;
A rotor frame 4 and a permanent magnet 11, which are rotatably supported via a bearing 6 fitted to the other end of the outer periphery of the cylinder and rotatably drive the wheels 3; The stator comprises a stator core 9 and a stator coil 8 which are disposed close to the inside of the permanent magnet 11 of the stator and are fitted to the outer periphery of the cylinder between the two bearings.

In this embodiment, there is provided a cooling jacket 7 fitted face-to-face with the inner surface of a stator core 9 as a stator and fitted around the outer periphery of the cylinder 2. A plurality of cooling water passages 14 communicating with the cooling water passages 12 of the cylinder 2 are provided inside the cooling water passages 12, and the cooling water flowing through the cooling water passages 12 and the cooling water passages 14 cools the stator core 9 in contact with the outer periphery of the cooling jacket 7. An example in which the structure is as follows is shown. Further, on both outer sides of the cooling jacket 7, together with the stator core 9 having a stator coil 8, a stator retainer 10a for securing the cooling jacket 7, 10b is that is fixedly installed.

In this embodiment, the stator retainers 10a and 10b are separate components from the cooling jacket 7, but are not provided with the stator retainers.
One of 10a and 10b may be formed integrally with the cooling jacket 7. Furthermore, although an electric motor using the permanent magnet 11 for the rotor is illustrated, an induction motor may be used.

Returning to the drawing, the cooling water passage 12 is provided by drilling a hole in the cylinder 2. The cooling water separately pumped from one end of the cylinder 2 passes through the cooling water passage 12 through the water reservoir 13 to be communicated with the cooling water passage 12 inside the cylinder 2 through the cooling jacket 7 provided with a hole. Multiple cooling water channels
Reaches 14. Then, the stator core 9 as a stator that is in contact with the outer periphery of the cooling jacket 7 is cooled. The cooling water flowing through the cooling water passage 14 and cooling the stator core 9 is turned back inside the cooling jacket 7, drains from the cooling jacket 7 again through the cylinder 2, and from the other end of the cylinder 2. The temperature of the drained cooling water is lowered by a radiator (not shown), and is sent to the cooling water passage 12 again.

The cooling water passage 12 of the cylinder 2 is connected to a water inlet pipe 20a and a drain pipe 20b (not shown) which is behind the water inlet pipe 20a in FIG. In this embodiment, one inlet-side cooling water channel 12 is connected to the water inlet pipe 20a, and one drain-side cooling water channel 12 is connected to the drainage pipe 20b. And one inlet side cooling water channel
A water reservoir 13 is bored inside the cylinder 2 to communicate between the cooling water passage 12 and a plurality of cooling water passages 14 inside the cooling jacket 7. That is, one cooling water passage 12 on the inlet side is branched into a plurality of cooling water passages 14 by the water reservoir 13.

Therefore, the cooling water as the cooling liquid is supplied to the cooling water passage "the water inlet pipe 20a, the cooling water passage 12, and the water reservoir 1".
3, communication water channel 22, cooling water channel 14, communication water channel 22, water reservoir 13,
Cooling water channel 12, drain pipe 20b ". In addition, a plurality of cooling water passages 14 inside the cooling jacket 7 are arranged on a concentric circle centered on the central axis of the axle 1 on both the water inlet side and the water discharge side. Further, another water reservoir 13 having the same structure is provided in the cooling water passage 12 on the drain side. In addition, as a cooling liquid, there are oil and chemicals in addition to water.

On the other hand, a lead wire for transmitting power to the stator coil 8
Reference numeral 15 denotes a wiring hole formed in the cylinder 2 from the stator coil 8.
It is assumed that it is drawn out from the end of the cylinder 2 via 16. The wiring hole 16 may be used also as the cooling water passage 12.
This configuration is advantageous in terms of workability,
This is also effective in sealing a motor portion (a portion including a portion of the stator to be cooled) which will be described later. Also, wiring holes 16
May be a groove-shaped wiring groove 21 (shown in FIG. 2).

With the above configuration, the stator core 9 can be efficiently cooled by passing the cooling water through the plurality of cooling water passages 14. That is, by setting the cooling jacket 7, it is possible to dispose the finely cooling water passage 14 to the cooling jacket 7, that a good cooling efficiency of the stator core 9.

The cooling jacket 7, members having a thermal conductivity greater heat conductivity of the cylinder 2, may be formed for example of aluminum member. This separates the cylinder 2 as a mechanical strength member supporting the wheels 3 and the rotors (bearings 5 and 6) and the cooling jacket 7 as a good heat conductive member for cooling the stator core 9 from the viewpoint of required functions. Thus, a member configuration utilizing each feature is obtained. In general, a good heat conductive member does not have high mechanical strength.
It can be said that a (two-layer) configuration is desirable. There is also an advantage that the use of aluminum facilitates drilling of the cooling water passage 14.

On the other hand, drilling is performed on the cylinder 2 and the cooling jacket 7.
These are divided on the left and right sides of a wheel-integrated electric motor having a single-shaft, two-wheel structure, and are easier to machine than in the case of a conventional structure in which a hole is directly formed in the axle 1. further,
In the maintenance work, by pulling out the axle 1 from the cylinder 2, the cooling jacket 7 or the stator or the rotor integrated with the cylinder 2 can be handled independently.
The maintenance of the bearing 6 on the opposite side of the wheel 3 can be performed by simply removing the axle 1 from the cylinder 2 without disassembling the bearing 5.

In the embodiment shown in FIG. 1, a permanent magnet 11 as a rotor, a stator core 9 as a stator and a stator coil 8 are formed by a water-cooled structure. Child frame 4 (wheel 3 may be removed)
Can be enclosed by In other words, it is possible to adopt a structure in which the motor portion including the portion of the stator to be cooled is sealed. That is, since the cooling liquid is used, the structure becomes a hermetic structure and the electric motor portion does not come into contact with the outside air, so that the dust resistance is improved. As a result, the maintenance cycle can be extended.
Therefore, according to the present embodiment, a wheel-integrated electric motor with improved cooling performance while maintaining good maintainability and good productivity is provided.

FIG. 2 is a partial sectional view showing a wheel-integrated motor according to another embodiment of the present invention. Similar to FIG. 1, a cross section of the upper left half of the wheel-integrated electric motor is drawn to show a schematic configuration thereof. In FIG. 2, the water inlet pipe 20a
Has a structure in which cooling water enters the left and right wheels 3 from one pipe. That is, the cooling water enters through one water inlet pipe 20a disposed substantially at the center of the axle 1 and branches off to the left and right wheels at the water reservoir 17, and the branched cooling water is divided into the cylinder 2 and the cooling jacket. 7 Cooling channel inside
18, water reservoir 19, communication channel 22a, cooling channel 14, communication channel 22
b, the water flowing through the water reservoir 13, and the cooling water passage 12, and exits from two drainage pipes 20b on both sides.

One cooling water passage 18 inside the cylinder 2 is provided with a water reservoir.
Branches at 19, multiple cooling channels inside cooling jacket 7
The cooling water path 14 is divided into 14 and the plurality of cooling water paths 14 become one cooling water path 12 in the water reservoir 13. Then, lead wires 15 are drawn out from both ends of the left and right wheels of the cylinder 2. According to the above configuration, it is not necessary to turn the cooling water passage 14 inside the cooling jacket 7, so that the hole workability of the cooling jacket 7 is improved.

In the embodiment shown in FIGS. 1 and 2, the cooling water passage 12 or the cooling water passages 12 and 18 inside the cylinder 2 are provided one for water input and one for water discharge, however, as another embodiment, A plurality of cooling water passages 12, 18 may be provided. In this case, a water reservoir (not shown) is provided near the axial end of the cylinder 2, and a plurality of cooling water passages 12 and 18 inside the cylinder 2 are provided. Further, as another embodiment, there is a structure in which the cooling water passage 14 inside the cooling jacket 7 is formed in a spiral shape. By forming the cooling water passage 14 in a spiral shape, the heat transfer area of the cooling water to the cooling jacket 7 is increased, and the cooling efficiency can be improved.

Next, another embodiment will be described. FIG.
FIG. 4 is a partial sectional view showing a wheel-integrated electric motor according to another embodiment of the present invention. In this embodiment, a cooling water passage inside the cylinder 2 is provided.
A water reservoir 13 and a water reservoir 19 are provided inside the stator retainers 10a and 10b for communicating between 12 or 18 and the cooling water passage 14 inside the cooling jacket 7. In the embodiment shown in FIGS. 1 and 2, the water reservoir 13 and the water reservoir 19 need to be formed over the entire circumference in the circumferential direction around the central axis of the cylinder 2. In addition, a communication water passage 22 that communicates the water reservoir 13 or the water reservoir 19 with the cooling water passage 14.
The holes a and 22b need to be formed as a plurality of holes inside the cylinder 2. Further, since the cooling water passage 14 is bent inside the cooling jacket 7, processing is difficult.

On the other hand, according to the configuration of the present embodiment, the processing of the cylinder 2 requires the minimum number
(For example, only one hole) for cooling water channel, and
The drilling of the cooling water passage 14 inside the cooling jacket 7 is straight, and the workability is improved. In addition, stator holders 10a, 10b
The workability of the water reservoir 13 and the water reservoir 19 provided inside the
It can be said that it is easier than the case where it is provided inside.

[0024]

According to the above invention , the cooling air is passed through the inside of the cylinder.
By providing a cooling jacket having a cooling water passage communicating with the cylindrical cooling water passage and providing a structure in which the axle, the cylinder, the cooling jacket, the stator, and the like are divided and assembled, the stator cooling efficiency is improved. In addition, there is an effect that the manufacture and maintenance of the electric motor become easy.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing a wheel-integrated electric motor according to an embodiment of the present invention.

FIG. 2 is a partial sectional view showing a wheel-integrated electric motor according to another embodiment of the present invention.

FIG. 3 is a partial sectional view showing a wheel-integrated electric motor according to another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Axle, 2 ... Cylinder, 3 ... Wheel, 4 ... Rotor frame, 5, 6
... bearing, 7 ... cooling jacket, 8 ... stator coil, 9 ...
Stator iron core, 10a, 10b ... stator holder, 11 ... permanent magnet, 1
2, 14, 18 ... cooling water passage, 13, 17, 19 ... water reservoir, 15 ... lead wire, 16 ... wiring hole, 20a ... water inlet pipe, 20b ... drainage pipe, 21 ... wiring groove, 22, 22a, 22b … Communication channel

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Keiichiro Kondo 2-8-8 Hikaricho, Kokubunji-shi, Tokyo Inside the Railway Technical Research Institute (72) Inventor Hiroaki Mita 3-1-1 Sachimachi, Hitachi-shi, Ibaraki No. 1 Hitachi, Ltd. Hitachi Plant (72) Inventor Seikichi Masuda 3-1-1, Kochi-cho, Hitachi-shi, Ibaraki Prefecture Hitachi, Ltd. Hitachi Plant (72) Inventor Hirofumi Ihara 3-chome, Kochi-cho, Hitachi, Ibaraki No. 1-1 Co., Ltd.Hitachi, Ltd., Hitachi Plant (72) Inventor Toshio Nemoto 3-1-1, Sachimachi, Hitachi, Ibaraki Pref. Hitachi 1-1, Hitachi, Ltd. (72) Inventor Takashi Watanabe 3-1-1, Saimachi, Hitachi-shi, Ibaraki Pref. (56) References JP-A-7-9993 (JP, A) JP-A 8-65960 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B61C 3 / 00 B61C 17/00

Claims (6)

(57) [Claims] 1. A cylinder fitted on the outer periphery of an axle, a wheel rotatably supported on the outer periphery of the cylinder, and a rotor rotatably supported on and connected to the outer periphery of the cylinder for driving the wheels. A wheel-integrated electric motor comprising: a rotor disposed close to the inside of the rotor ; and a cooling passage provided inside the cylinder,
Fitted on the outer circumference and face-fitted on the inner surface of the stator
Providing a cooling jacket, wherein the cooling jacket is
Cooling passages communicating with the cooling passages provided inside the
A wheel-integrated motor having a road therein . 2. A wheel-integrated electric motor according to claim 1, wherein a portion of said stator to be cooled is sealed by said rotor and said cylinder. 3. The wheel-integrated electric motor according to claim 1, wherein said cooling jacket is made of a member having a thermal conductivity larger than a thermal conductivity of said cylinder. 4. The method of claim 1, wherein the cooling jacket and the stator is fixed at the stator retainer, stator retainer, the cylindrical interior of the cooling passage and the cooling jacket inside the cooling passage therein And a water reservoir communicating with the motor. 5. The method of claim 1, wherein the cylinder is a wheel-integrated electric motor characterized by having a wiring hole of leads that power to the stator. 6. A train comprising the wheel-integrated electric motor according to any one of claims 1 to 5.