JP2001238396A - Fully enclosed rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save energy in maintenance of a fully enclosed rotating electric machine by suppressing the temperature rise in a bearing section and preventing early deterioration of lubricating grease, thereby extending the disassembly period. SOLUTION: This fully enclosed rotating electric machine 19 is equipped with support means 20 and 21 which are equipped with bearings 5 and 7 for supporting a shaft 9 rotatably, at the end of a frame 2. For this fully enclosed electric machine 19, circular cooling spaces 27 and 28 which communicate with the outside air and are concentrical with the shaft 9 are made between the bearing supports 20b and 21b which are the sections near the bearings 5 and 7 out of the support means 20 and 211 and the other sections of the support means 20 and 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fully-closed rotary electric machine such as a fully-closed drive motor for railway vehicles.

[0002]

2. Description of the Related Art In a driving motor (motor) for a railway vehicle (especially a train), ventilation cooling is performed so that a temperature rise during operation does not exceed a specified value.

[0003] As a method of the ventilation cooling, a ventilation fan mounted on a rotating shaft in the drive motor rotates to take in outside air into the drive motor to circulate the inside of the drive motor, thereby performing ventilation cooling of the heat generating portion. It is a target.

However, when cooling is performed by taking in and flowing outside air into the drive motor in this way, dust contained in the outside air may adhere to the inside of the device and become dirty, thereby lowering the heat radiation effect. Therefore, it is necessary to periodically disassemble the drive motor and perform maintenance such as cleaning, and improvement is demanded in terms of maintenance.

[0005] Further, the sound of the rotation of the self-ventilating fan for circulating outside air leaks from the air outlet of the cabin air to the surroundings,
Particularly in a region where the number of rotations is large (high-speed operation region), a large noise is generated.

[0006] In order to solve these problems, in recent years, a fully-closed motor has been developed. In the case of a fully-closed drive motor, since the outside air is not circulated inside the machine, the inside of the machine is not polluted with dust for a long time. Therefore, it is not necessary to disassemble for a long period of time, and labor for maintenance can be saved.

Further, since a ventilation fan is not required,
The noise due to the rotation of the fan is eliminated, and the noise can be significantly reduced.

FIG. 10 is a sectional view showing the structure of this conventional fully-closed drive motor. In FIG. 10, the rotation axis of the shaft provided in the fully-closed drive motor is arranged to be horizontal, and the upper half of the fully-closed drive motor in a side section parallel to this rotation axis is shown. The lower half that is symmetrical is omitted.

This conventional fully-closed drive motor 1 has a frame 2 formed in a cylindrical shape. An hollow cylindrical stator core 3 is attached to the inner peripheral surface of the frame 2.

The stator coils 4 are accommodated in a number of longitudinal grooves provided on the inner peripheral surface of the stator core 3.

A bearing bracket 6 having a bearing 5 is provided at one end of the frame 2, and a housing 8 having a bearing 7 is provided at the other end of the frame 2. .

The bearings 5 and 7 rotatably support a shaft 9 as a rotor. The shaft 9 is provided coaxially with the frame 2 and the stator core 3.

The bearing 5 and the bearing 7 are filled with a lubricant such as lubricating grease for smoothly rotating the shaft 9.

A rotor core 10 is provided at the center of the shaft 9.
The rotor bar 11 is mounted in a number of grooves provided on the outer peripheral surface of the rotor core 10.

The rotational force generated in the rotor core 10 is transmitted to the driving device from the end 9a of the shaft 9.

A large number of cooling fins 2a and 2b are provided on the outer peripheral surface of the frame 2 and the other end side surface.
Dissipates the heat generated inside the machine to the outside air.

Also, a number of cooling fins 6a are provided on the side surface of the bearing bracket 6.

FIG. 11 is an external view showing an attached state of the conventional fully-closed drive motor 1 as described above. This figure 1
Reference numeral 1 denotes a direction perpendicular to the rotation axis of a shaft 9 provided in the fully-closed drive motor 1, and is a view of the fully-closed drive motor 1 viewed from a bearing bracket 6.

The fully closed drive motor 1 is fixedly supported on a bogie frame 12 by support arms 2c and 2d provided on a part of the frame 2.

Provided adjacent to the fully-closed drive motor 1 is a drive device comprising a gear (large gear) 13, a pinion (small gear) 14, and a gear box 15.

The rotational force of the fully-closed drive motor 1 is transmitted from the end 9a of the shaft 9 to the pinion 14, and the pinion 1
Axle 1 of wheels 16 via gear 13 meshing with
6a is rotated. As a result, the vehicle 17
Drive on.

[0022]

In the case of the conventional fully-closed drive motor 1 as described above, the stator coil 4 and the rotor bar 11, which are the heat generating parts, pass through the stator core 3 and the rotor core 10 and the frame 2 and the shaft 9 respectively. And the inside air is also heated, and this heat is transmitted to the frame 2, the bearing bracket 6, and the housing 8, and is discharged to the outside air.

Therefore, in the case of the conventional fully-closed drive motor 1, the temperature of the entire apparatus is increased. In the case of the self-ventilation cooling motor, since the cooling air flows directly through the heat-generating portion, the heat of the heat-generating portion is discharged to the outside by the cooling air at a high rate. Temperature does not increase.

The interior of the bearings 5 and 7 and the spaces on both side surfaces of the bearings 5 and 7 in the conventional fully-closed drive motor 1 are filled with lubricating grease to lubricate the bearings.

In the case of such a fully-closed drive motor 1, the bearing bracket 6, the housing 8,
The temperature of the shaft 9 and the like is significantly higher than that of the self-ventilated cooling drive motor.

Therefore, the thermal deterioration of the lubricating grease is quick, the lubricating life is shortened, and the grease needs to be replaced at an early stage.

Although the fully-closed drive motor 1 prevents the inside of the machine from being soiled and extends the non-disassembly period to save labor for maintenance, as described above, replacement of the lubricating grease for the bearings 5 and 7 is required. Therefore, it is a problem that the disassembly must be performed early.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and a fully-closed drive for extending a non-disassembly period by suppressing a rise in temperature of a bearing portion and preventing early deterioration of lubricating grease. An object is to provide an electric motor.

[0029]

Means taken to realize the present invention will be described below.

According to a first aspect of the present invention, a cooling space is provided near a bearing in a fully-closed rotating electric machine that rotatably supports a shaft by a bearing.

The fully-closed rotary electric machine includes a fully-closed drive motor (motor) and a fully-closed generator.

According to the first aspect, it is possible to prevent the heat generated in the fully-closed rotating electric machine from being transmitted to the bearing.

Therefore, the temperature rise of the bearing portion is suppressed,
Prevention of early deterioration of the lubricating grease can extend the non-decomposition period, thereby saving maintenance.

According to a second aspect of the present invention, in a fully-closed rotary electric machine that rotatably supports a shaft with a bearing, a cooling space is provided between a boundary part that separates the outside and the inside and a bearing supporting part that is a part near the bearing. This is a fully-closed rotary electric machine provided with.

In the second aspect of the present invention, since the cooling space is provided between the boundary and the bearing support, the heat transmitted to the bearing via the boundary can be reduced.

Generally, in a fully-closed rotary electric machine, the temperature at the boundary between the frame, the bearing bracket, the housing, and the like becomes large. However, this temperature can be prevented from being transmitted to the bearing.

Therefore, the temperature rise of the bearing portion is suppressed,
Prevention of early deterioration of the lubricating grease can extend the non-decomposition period, thereby saving maintenance.

A third aspect of the present invention is the fully-closed rotary electric machine according to the first or second aspect of the present invention, wherein the cooling space is formed in an annular shape concentric with the shaft.

In the third aspect, in addition to the same operation and effect as the first and second aspects, since the cooling space is formed in an annular shape concentric with the shaft, the cooling space is formed in any direction from the boundary to the bearing support. From the heat is prevented.

Further, it is possible to prevent heat from being transmitted from the shaft to the bearing support.

Therefore, it is possible to further suppress a rise in the temperature of the bearing portion, prevent the deterioration of the lubricating grease from occurring early, extend the non-decomposition period, and save labor.

According to a fourth aspect of the present invention, there is provided a fully-closed rotary electric machine having a supporting means having a bearing for rotatably supporting a shaft at an end of a frame. A fully-closed rotary electric machine in which an annular cooling space communicating with outside air and concentric with a shaft is formed between the rotating electric machine and another part of the means.

In the fully-closed rotary electric machine according to the fourth aspect of the present invention, the stator is formed on the inner peripheral surface of the frame, for example.
A bearing bracket and a housing, which are support means, may be provided at an end of the frame, and the bearing bracket and the housing may each be provided with a bearing.

Further, the bearing bracket and the housing may be circular, and the inner diameter portion (near the center) may be a bearing support portion, and the outer diameter portion (near the circumference) may be other portions than the bearing support portion. .

In such a case, the heat generated in the stator is transmitted to the bearing bracket and the housing via the frame. However, because of the cooling space, the heat is transmitted to the bearing support, which is the inner diameter of the bearing bracket and the housing. Is prevented.

Therefore, the temperature rise of the bearing portion is suppressed,
Prevention of early deterioration of the lubricating grease can extend the non-decomposition period, thereby saving maintenance.

According to a fifth aspect, in the fully-closed rotary electric machine of the fourth aspect, the bearing support portion is supported by the other portion of the support means and the plurality of ribs, and the outside air is annular between the plurality of ribs. This is a fully-closed rotary electric machine that is a communication port for communicating with the cooling space.

As in the fifth aspect of the present invention, the bearing support portion connects the other portion of the support means via the rib, and the space between the ribs serves as a communication port for the outside air. Heat can be prevented from being transmitted from the portion to the bearing support.

A sixth aspect of the present invention is the fully-closed rotary electric machine according to the fifth aspect of the present invention, wherein at least one of the plurality of ribs is provided with a cooling fin.

By providing the cooling fins on the ribs as in the sixth aspect, the cooling effect can be further improved.

According to a seventh aspect, in the fully-closed rotary electric machine according to the fourth to sixth aspects, a wall is provided upstream of the labyrinth formed in the wall of the annular cooling space on the upstream side of the outside air flow.
This is a fully-closed rotary electric machine that has a rotating groove that is open on the upstream side of the outside air inflow and is provided annularly so as to be concentric with the annular cooling space.

In the seventh aspect, even when water or the like enters the cooling space together with the outside air, the turning groove can prevent water or the like from entering the inside of the machine or the bearing via the labyrinth. it can.

Therefore, the non-decomposition period is extended, and maintenance can be saved.

According to an eighth aspect, in the fully-closed rotary electric machine according to the seventh aspect, the vicinity of the turning groove provided in the supporting means of the turning groove can be separated from a portion of the supporting means which is not near the turning groove. This is a fully closed rotary electric machine.

In the eighth aspect of the present invention, the portion near the turning groove is processed beforehand, and thereafter, the respective portions are assembled to form a fully-closed rotary electric machine, which can be easily processed.

According to a ninth aspect, in the fully-closed rotary electric machine according to the fourth to eighth aspects, a fully-closed rotary electric machine including a guide wind path for guiding flowing outside air to an annular space.

According to the ninth aspect, since the outside air is positively guided to the cooling space by the guide wind path, the cooling effect can be further improved.

[0058]

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

(First Embodiment) In the present embodiment, a fully-closed drive motor having an annular cooling space near a bearing will be described.

FIG. 1 is a sectional view showing the configuration of a fully-closed drive motor according to the present embodiment. In FIG. 1, similarly to FIG. 10 described above, the rotation axis of the shaft provided in the fully-closed drive motor is arranged to be horizontal, and the upper half of the fully-closed drive motor in a side cross section parallel to the rotation axis. , And the lower half part that is almost symmetrical about the rotation axis is omitted.

Of the parts shown in FIG. 1, the same parts as those in FIG. 10 are denoted by the same reference numerals, and the description thereof will be simplified or will be briefly described.

A stator core 3 is provided on the inner peripheral side of the frame 2 of the fully-closed drive motor 19, and a stator coil 4 is accommodated in a groove provided on the inner peripheral side of the stator core 3.

A bearing bracket 20 is supported at one end of the frame 2 and a housing 21 is supported at the other end.

A large number of cooling fins 2a and 2b are provided on the outer periphery of the
Are also provided with a number of cooling fins 6a.

A rotor core 10 is fixed to the center of the shaft 9 supported by the bearings 5 and 7 in the machine, and a rotor bar 11 is attached to the outer periphery of the rotor core 10. One end 9a of the shaft 9 is connected to a driving device (not shown).

The bearing bracket 20 is formed in a circular shape (it can be called an annular shape because the shaft 9 passes through the central portion), and is disposed at one end of the frame 2 at the outer peripheral portion so as to be concentric with the shaft 9. ing. The bearing bracket 20 mainly includes an outer diameter portion, an inner diameter portion, and a rib 20a connecting the outer diameter portion and the inner diameter portion.

That is, the bearing bracket 20
A bearing support portion 20b connected to the outer diameter portion via a plurality of ribs 20a is provided at the inner diameter portion (center portion) of the.
As described above, the shaft 9 is rotatably supported by the bearing 5 provided on the bearing support portion 20b.

Similarly, the housing 21 is formed in a circular shape, and is disposed at the other end of the frame 2 so as to be concentric with the shaft 9. A bearing support 21b connected to the outer diameter of the housing 21 via a plurality of ribs 21a is provided on the inner diameter of the housing 21, and the shaft 9 is rotatably supported by the bearing 7 provided on the bearing support 21b. Is done.

FIG. 2 is an external view of the fully-closed drive motor 19 according to the present embodiment as viewed from the bearing bracket 20 side, and shows a case where the rotation axis of the shaft 9 is viewed from a vertical direction.

The inner peripheral side of the outer diameter part of the bearing bracket 20, the outer peripheral side of the bearing support part 20b of the inner diameter part of the bearing bracket 20, and the rib 20a connecting the outer diameter part of the bearing bracket 20 and the bearing support part 20b. The separated space (space between the ribs 20a) becomes the communication port 22.

FIG. 3 shows the fully-closed drive motor 19 shown in FIG.
FIG. 3 is an enlarged sectional view of the vicinity of the bearing 5 of FIG.

The bearing 5 is fixed in the longitudinal direction (the rotation axis direction of the shaft) by the end lid 23 and the collars 24 and 25, and the space inside the bearing 5 and the space on the side surface of the bearing 5 is filled with lubricating grease.

The inner peripheral side of the outer diameter portion of the bearing bracket 20 and the inner end thereof extend toward the inner diameter side (the shaft 9 side). A labyrinth 26 is formed with a minute gap between the labyrinth 26 and the labyrinth.

The frame 2 and the bearing bracket 20,
An annular space 27 concentric with the shaft 9 is provided between the space inside the machine surrounded by the housing 21 and the bearing support portion 20b.
Are formed.

The annular space 27 is communicated with outside air outside the machine by the communication port 22 formed between the ribs 20a. In addition, the state in which it communicates with the outside air means a state in which the outside air can enter.

On the other hand, on the housing 21 side, an annular space 28 is formed between the internal space and the bearing support 21b, similarly to the bearing bracket 20 side.

The cooling operation of the fully-closed drive motor 1 according to the present embodiment having the above-described configuration will be described below.

The heat generated from the stator coil 4 in the fully-closed drive motor 1 is transmitted to the frame 2 and the outer diameter of the bearing bracket 20 via the stator core 3. Also,
The heat generated by the stator coil 4 and the rotor bar 11 is transmitted to the frame 2 and the outer diameter of the bearing bracket 20 via the air inside the machine.

The heat transmitted to the frame 2 and the outer diameter portion of the bearing bracket 20 is effectively released to the outside air by the surface of the frame 2, the bearing bracket 20 and the cooling fins 2a, 2b, 6a, and the temperature of the heat generating portion is suppressed. Is done.

The heat generated by raising the temperature of the outer diameter portion of the bearing bracket 20 and the outer diameter portion of the housing 21 is transferred to the ribs 20a,
The ribs 20a, 21a are transmitted to the bearing support portions 20b, 21b via 21a, but the ribs 20a, 21a are cooled by the external air because the external air is flowing (natural flow) directly in the annular spaces 27, 28.

Therefore, the bearing supports 20b, 21b
Is suppressed, the temperature rise of the bearings 5 and 7 is also suppressed.

As described above, since the heat transmitted from the inside of the machine to the bearings 5 and 7 is suppressed by the annular spaces 27 and 28, the temperature rise of the bearings 5 and 7 is reduced, and the thermal deterioration of the lubricating grease is prevented. .

As described above, in the fully-closed drive motor 1 according to the present embodiment, the inner diameter of the bearing bracket 20 and the housing 21 constituting the outer wall is
Bearing supporting portions 20b and 21b that support the bearings 5 and 7 and are filled with lubricating grease are configured.

Here, in the present embodiment, the bearing support portion 20b of the inner diameter portion of the bearing bracket 20 fixed to the frame 2 and the outer diameter portion of the bearing bracket 20 are supported by a plurality of ribs 20a. .
Similarly, a bearing support portion 21b of the inner diameter portion of the housing 21 fixed to the frame 2 and an outer diameter portion of the housing 21 are supported by a plurality of ribs 21a.

In the longitudinal direction between the bearing supports 20b, 21b and the internal space, annular spaces 27, 28 centering on the rotation axis of the shaft 9 are formed. That is, the annular spaces 27 and 28 are
An outer diameter portion and an outer diameter portion of the housing 21 (a boundary portion that separates a space inside the machine from a space outside the machine) and a bearing support portion 20b;
21b. This annular space 27, 28
Communicates the outside air through a communication port 22 formed between the ribs 20a and 21a.

Therefore, in the fully-closed drive motor 1 according to the present embodiment, since the outside air always flows through the annular spaces 27 and 28, the outside diameter of the bearing bracket 20 and the outside diameter of the housing 21 are removed from the frame 2 and the inside air. Heat transmitted to the bearing support portion 20 through the ribs 20a and 21a.
b, while being transmitted to 21b.

As a result, the temperature rise of the bearing supporting portions 20b and 21b provided with the bearings 5 and 7 is suppressed. Also,
Heat transmitted from the shaft 9 to the bearing support portions 20b, 21b is also cooled in the annular spaces 27, 28, so that a rise in temperature can be reduced.

Therefore, it is possible to prevent the deterioration of the lubricating grease at an early stage, to extend the non-decomposition period, and to save maintenance.

(Second Embodiment) In this embodiment,
A modification of the fully-closed drive motor 19 according to the first embodiment described above will be described.

In the present embodiment, the bearing bracket and the collar are connected by a cap to facilitate processing, and the cap is connected to the annular space side to prevent water or the like from entering the inside. A fully-closed drive motor having a groove on the surface will be described.

FIG. 4 is a sectional view showing the vicinity of the bearing of the fully-closed drive motor according to the present embodiment, and is shown in the same situation as in FIG. In FIG. 4, the same parts as those in FIG. 3 will not be described, or will be simply described, and only different parts will be described in detail.

A bearing support 29b connected to the outer diameter by a plurality of ribs 29a is supported on the inner diameter of the bearing bracket 29 formed in a circular shape. The bearing 5 is supported by the bearing support 29b. The shaft 9 is rotatably supported.

The inner side of the inner peripheral portion of the outer diameter portion of the bearing bracket 29 is fixed to the outer peripheral end portion of the annular cap 30 by bolts 31.

The cap 30 forms an annular space 27 between the internal space and the bearing support 29b. The annular space 27 communicates with outside air outside the machine by the communication port 22 between the ribs 29a.

The cap 30 is fixed at the outer peripheral end to the inner peripheral side of the outer peripheral part of the bearing bracket 29 as described above, whereas the inner diameter part of the cap 30 is provided with the labyrinth 32 by the collar 25. Make up.

In the annular space 27, a turning groove 33 which is a groove opened to the outer peripheral side is provided in the bearing support portion 29b of the inner diameter portion of the bearing bracket 29.

Further, in the annular space 27, the cap 30 is also provided with a similar turning groove 34 which is opened on the outer peripheral side.

[0098] On the inner diameter side of the turning groove 33, a labyrinth 35 constituted by a minute gap is formed between the turning groove 33 and the collar 25. Further, as described above, the labyrinth 3 formed with a small gap between the turning groove 34 and the collar 25 also on the inner diameter side of the turning groove 34.
2 are configured.

In the fully-closed drive motor according to the present embodiment, the same configuration as described above may be realized on the housing side.

In the fully-closed drive motor according to the present embodiment having the above-described configuration, when water enters the annular space 27 from the outside of the machine, the water that has proceeded along the wall turns into the turning groove 33, After being gathered in 34 and going down,
Emitted outside the machine.

As a result, water does not enter the minute gaps between the labyrinths 35 and 32, and it is possible to prevent water from entering the bearing 5 and the machine.

Since the train motor is mounted on a bogie under the floor, water or snow may be applied to the motor during traveling. In the case of the fully-closed drive motor according to the present embodiment, even in such a case, the water is inboard. And bearings 5 and 7 can be prevented from entering. Therefore, the non-decomposition period can be extended, and maintenance can be saved.

In the fully-closed drive motor according to the present embodiment, the bearing bracket 29 and the cap 3
0, so that the grooves 33, 3
Four parts and the like can be easily machined.

(Third Embodiment) This embodiment is a modification of the fully-closed drive motor according to the first or second embodiment described above, in which ribs are formed in a thin plate shape. A fully-closed drive motor having improved cooling efficiency will be described.

FIG. 5 is an enlarged external view of the vicinity of the ribs of the fully-closed drive motor according to the present embodiment, and shows a part of the same case as that shown in FIG.

In the fully-closed drive motor according to the present embodiment, the bearing bracket 36 and the bearing support portions 37 of the outer diameter portion and the inner diameter portion of the bearing bracket 36 are supported by a number of thin plate-shaped ribs 38. Between the ribs 38, a communication port 39 for communicating the annular space with the outside air is formed.

By providing a large number of ribs 38 as in this embodiment, the area of the entire ribs 38 contacting the outside air can be increased, and the cooling performance can be further improved.

As a result, the amount of heat transmitted to the bearing support 37 can be reduced, and the temperature of the bearing can be further prevented from rising.

Therefore, early deterioration of the lubricating grease can be prevented, the non-decomposition period can be extended, and maintenance can be saved.

(Fourth Embodiment) This embodiment is a modification of the fully-closed drive motor according to the first to third embodiments described above, in which a cooling fin is provided on a rib. The fully closed drive motor will be described.

FIG. 6 is an enlarged external view of the vicinity of the ribs of the fully-closed drive motor according to the present embodiment, and shows a case where it is shown in the same situation as in FIG. In the following, the same portions as those in the above-described drawings are denoted by the same reference numerals, and description thereof will be omitted.

In the fully-closed drive motor according to the present embodiment, plate-like cooling fins 41 are provided on the ribs 40 substantially perpendicular to the longitudinal direction of the ribs 40. A communication port 42 is provided between the ribs 40.

FIG. 7 is a cross-sectional view showing the vicinity of the rib 40 of the fully-closed drive motor according to the present embodiment, and is shown in the same situation as in FIG.

As described above, in the present embodiment, the cooling fins 41 are provided integrally with the ribs 40 supporting the bearing support portions 20b of the inner diameter portion of the bearing bracket 20.

The heat transmitted from the bearing bracket 20 to the bearing support 20b via the ribs 40 is effectively released to the atmosphere by the cooling fins 41. Therefore, the heat transmitted to the bearing support 20b is further reduced, and the temperature of the bearing is reduced. The rise can be further reduced.

Therefore, the early deterioration of the lubricating grease is prevented, the non-decomposition period can be extended, and the maintenance can be saved.

(Fifth Embodiment) This embodiment is a modification of the fully-closed drive motor according to the first to fourth embodiments described above, and is provided outside the bearing support portion. A fully-closed drive motor provided with a guide wind path for introducing traveling wind into an annular space will be described.

FIG. 8 is an external view of the fully-closed drive motor according to the present embodiment as viewed from the bearing bracket side.
This is illustrated in the same situation as in FIG.

FIG. 9 is a cross-sectional view showing the vicinity of the bearing of the fully-closed drive motor according to the present embodiment, and is a cross-sectional view of FIG. 8, which is similar to FIGS. Is shown in FIG.

In the following, the same portions as those in the above-mentioned drawings are denoted by the same reference numerals, and description thereof will be omitted.

In the fully closed drive motor 43, the inner peripheral side of the outer diameter portion of the bearing bracket 20 supports the bearing support portion 20b by the rib 20a and the partition rib 44.
An annular space 27 is formed between the inside of the machine and the bearing 5.

The fully-closed drive motor 43 is the same as that shown in FIG.
Is provided in a railway vehicle in a state similar to that of the conventional fully-closed drive motor 1 described above.

Here, as shown in FIG. 8, the railway vehicle provided with the fully-closed drive motor 43 according to the present embodiment moves in the left direction A
, The fully closed drive motor 43 receives a traveling wind in a direction B (rightward) opposite to the traveling direction A.

The annular space 27 is communicated with the outside air by a communication port 45 formed between the rib 20a and the partition rib 44, as in the case described in the previous embodiment.

Fully-closed drive motor 43 according to this embodiment
Is provided with a guide air passage 46 that covers the communication opening 45 of the bearing bracket 20.

As shown in FIG. 8, the guide wind path 46 is open on the side that receives the traveling wind, and the partition ribs 44 arranged above and below the center protrude into the air path and guide the traveling wind through the guide wind path 46. It is divided into the receiving side and the discharging side (that is, left and right).

The operation of the fully-closed drive motor 43 according to the present embodiment having the above configuration will be described below.

As the vehicle travels, the traveling wind becomes
The traveling wind that has flowed in is positively flown into the annular space 27 from the communication port 45 on the entry side by the partition ribs 44 protruding in the guide wind path 46.

Further, the traveling wind flowing into the annular space 27 is discharged from the communication port 4 on the discharge side to the guide wind path 46,
Emitted outside the machine.

As described above, in the fully-closed drive motor 43 according to the present embodiment, the traveling wind during vehicle operation is positively circulated in the annular space 27, so that the cooling effect is further improved. The temperature rise of the bearing 5 can be further reduced.

Therefore, the early deterioration of the lubricating grease is prevented, the non-decomposition period can be extended, and the maintenance can be saved.

The structure in which the wind is actively taken into the cooling space may be used not only on the bearing bracket side but also on the housing side.

In each of the above embodiments, the case where the outer wall portion for separating the inside air from the outside air of the fully closed drive motor is constituted by the frame, the outer diameter of the bearing bracket, and the housing will be described as an example. But not limited to this. For example, even when all the outer wall portions are constituted by frames, the same operation and effect can be obtained by adopting a similar configuration (providing a cooling space between the outer wall portion and the bearing support portion).

Further, in each of the above embodiments, the bearing bracket is configured integrally with the outer diameter portion, the rib, and the bearing support portion. However, the outer diameter portion, the rib, and the bearing support portion are different from each other. It may be. Similarly, the housing may have another configuration of the outer diameter portion, the rib, and the bearing support portion.

Further, in each of the above-described embodiments, the case where a special cooling structure is applied to the fully-closed drive motor is described. However, the present invention is not limited to this. The same cooling structure can be applied to such various fully-closed rotary electric machines.

[0136]

As described in detail above, in the fully-closed rotating electric machine of the present invention, a cooling space is provided between a boundary part that separates the inside and the outside and a part that supports the bearing.

Therefore, even if heat from the inside of the fully-closed rotary electric machine is transmitted to the boundary portion, it is prevented from being transmitted to the portion that supports the bearing ahead.

Further, in the present invention, by forming the cooling space in an environment concentric with the shaft, heat is prevented from being transmitted from the shaft to the bearing support.

Thus, in addition to the effect obtained by the fully closed type, it is possible to prevent the temperature of the bearing from rising.

Therefore, the rise in the temperature of the bearing portion is suppressed,
Premature deterioration of the lubricating grease can be prevented, the non-decomposition period is extended, and maintenance work is saved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of a fully-closed drive motor according to a first embodiment of the present invention.

FIG. 2 is an external view of the fully-closed drive motor according to the embodiment as viewed from a bearing bracket side.

FIG. 3 is an enlarged sectional view of the vicinity of a bearing of the fully-closed drive motor according to the embodiment;

FIG. 4 is a sectional view showing the vicinity of a bearing of a fully-closed drive motor according to a second embodiment of the present invention.

FIG. 5 is an enlarged external view of the vicinity of a rib of a fully-closed drive motor according to a third embodiment of the present invention.

FIG. 6 is an enlarged external view of the vicinity of a rib of a fully-closed drive motor according to a fourth embodiment of the present invention.

FIG. 7 is an exemplary sectional view showing the vicinity of a rib of the fully-closed drive motor according to the embodiment;

FIG. 8 is an external view of a fully-closed drive motor according to a fifth embodiment of the present invention as viewed from a bearing bracket side.

FIG. 9 is a cross-sectional view showing a configuration of a continuity imparting unit which is an element of the covering unit in the embodiment.

FIG. 10 is a sectional view showing the structure of a conventional fully-closed drive motor.

FIG. 11 is an external view showing an attached state of a conventional fully-closed drive motor.

[Explanation of symbols]

 1, 19, 43 ... Fully-closed drive motor 2 ... Frame 3 ... Stator core 4 ... Stator coil 5, 7 ... Bearing 6, 20, 29, 36 ... Bearing bracket 8, 21 ... Housing 9 ... Shaft 10 ... Rotor core 11 ... Rotor bar 20b, 21b, 29b, 37 Bearing support 22, 39, 42, 45 Communication port 23 End lid 24, 25 Collar 26, 32, 35 Labyrinth 27, 26 Space 20a, 29a, 38, 40 ... Ribs 2a, 2b, 6a, 41. Cooling fins 33, 34. Turning grooves 30. Caps 44. Partition ribs 46.

Continued on the front page (72) Inventor Koichi Matsuoka 2-8-3 Hikaricho, Kokubunji-shi, Tokyo Inside the Railway Technical Research Institute (72) Inventor Minoru Kondo 38-8-2 Hikaricho, Kokubunji-shi, Tokyo 38 Railway Company Within the Research Institute of Technology (72) Inventor Nobuyuki Yagi 2-24-24 Harumi-cho, Fuchu-shi, Tokyo Toshiba Transport Engineering Co., Ltd. In-house (72) Inventor Riki Kinoshita 1 Toshiba-cho, Fuchu-shi, Tokyo F-term in plant (reference) 5H605 AA01 BB01 BB05 CC01 CC02 CC04 CC05 CC08 DD03 DD07 DD09 DD12 EB10 EB23 5H609 BB16 BB19 PP01 PP02 PP05 PP06 PP07 PP08 PP09 PP10 PP11 QQ02 QQ10 QQ13 QQ15 QQ16 RR35 RR43 RR63 RR63

Claims (9)

[Claims] 1. A fully-closed rotary electric machine that rotatably supports a shaft with a bearing, wherein a cooling space is provided near the bearing. 2. A fully-closed rotary electric machine that rotatably supports a shaft by means of a bearing, wherein a cooling space is provided between a boundary portion separating the outside and the inside and a bearing support portion that is a portion near the bearing. A fully-closed rotary electric machine characterized by the above. 3. The fully-closed rotating electric machine according to claim 1, wherein the cooling space is formed in an annular shape concentric with the shaft. 4. A fully-closed rotary electric machine having a supporting means having a bearing for rotatably supporting a shaft at an end of a frame, wherein the bearing means is a part near the bearing and the supporting means. A fully-closed rotary electric machine, wherein an annular cooling space communicating with outside air and concentric with the shaft is formed between the rotating electric machine and another portion of the rotating means. 5. The fully-closed rotating electric machine according to claim 4, wherein the bearing support portion is supported by another portion of the support means and a plurality of ribs, and between the plurality of ribs,
A fully-closed rotary electric machine having a communication port for allowing outside air to communicate with the annular cooling space. 6. The fully-closed rotary electric machine according to claim 5, wherein cooling fins are provided on at least one of the plurality of ribs. 7. The fully-closed rotating electric machine according to claim 4, wherein the rotary electric machine is provided on a wall on the upstream side of an outside air inflow from a labyrinth formed on a wall of the annular cooling space. A fully-closed rotary electric machine, comprising: a rotating groove that is opened on the upstream side of the outside air inflow and is provided annularly so as to be concentric with the annular cooling space. 8. The fully-closed rotating electric machine according to claim 7, wherein a portion of the turning groove near the turning groove provided on the support means is separable from a portion of the supporting means that is not near the turning groove. A fully-closed rotary electric machine characterized by the above. 9. The fully-closed rotary electric machine according to claim 4, further comprising a guide wind path for guiding flowing outside air to the annular space. .