JP2021110363A - Bearing exchange method, bearing structure and main motor for vehicle - Google Patents

Abstract

To provide a bearing exchange method of a main motor for a vehicle with which it is unnecessary to hold a rotor shaft upon pulling out a bearing from the rotor shaft.SOLUTION: With a pair of bearing housings 10, 11 released from a pair of side brackets 3, 4 and a rotor shaft temporarily supported by a bracket inner diameter part of the pair of side brackets, a pair of bearings and the pair of bearing housings are removed from the rotor shaft. Then, a new bearing and a pair of new bearing housings are mounted on the rotor shaft, and the pair of bearing housings are fixed to the outer walls of the pair of side brackets.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for replacing bearings of a fully closed traction motor for rolling stock that drives a railroad vehicle, a bearing structure for the traction motor for rolling stock, and a traction motor for rolling stock having this bearing structure.

In railway vehicles, a fully closed traction motor that drives wheels is attached to a bogie placed under the floor of the vehicle body.
For example, the main electric motor for a vehicle of Patent Document 1 includes a stator core fixed to the inner peripheral side of a substantially cylindrical frame, a rotor core inside the stator core and fixed to a rotor shaft, and both ends of the frame. A pair of bearing housings arranged on the inner peripheral side via a bearing bracket, a pair of bearings arranged on the inner peripheral side of the pair of bearing housings and rotatably supporting the rotor shaft, and fixed to the bearing bracket. It includes a rotation support member that is movably arranged in the axial direction of the rotor shaft with respect to the bearing bracket, and a support receiving member that is fixed to the rotor shaft and comes into contact with the rotation support member by moving in the axial direction.

The grease filled in the bearings of the traction motor for vehicles tends to deteriorate gradually because the heat inside the machine and the dust in the outside air enter the bearings due to the negative pressure action of the cooling air. Further, since the base oil contained in the grease is easily depleted, it is necessary to refill the grease by periodic disassembly and maintenance of the bearing to obtain the grease in the optimum state containing the base oil sufficiently.
When the traction motor for a vehicle of Patent Document 1 disassembles and maintains the bearing, first, the rotary support member is moved in the axial direction to be brought into contact with the support receiving member, and the rotor shaft is held by the frame via the bearing bracket. back. As a result, the bearing can be replaced without completely disassembling the stator core, rotor core, rotor shaft, etc. of the traction motor.

Japanese Unexamined Patent Publication No. 2008-994981

By the way, in the disassembly and maintenance of the bearing of the traction motor for vehicles of Patent Document 1, it is necessary to hold the rotor shaft with the frame before pulling out the bearing from the rotor shaft, so that the disassembly and maintenance of the bearing is greatly reduced. It cannot be said that there is.
Further, a rotary support member and a support receiving member for supporting the rotor shaft with the frame are required, and there is a problem in terms of manufacturing cost due to an increase in parts.
Therefore, a bearing replacement method for vehicle traction motors, which does not require a member to hold the rotor shaft when the bearing is pulled out from the rotor shaft, and can significantly reduce the labor required for disassembling and maintaining the bearing, and reduction of manufacturing costs. It is an object of the present invention to provide a bearing structure of a traction motor for a vehicle and a traction motor for a vehicle which can be used.

In order to achieve the above object, the bearing replacement method for the vehicle traction motor according to one aspect of the present invention is arranged in a tubular case, a stator core fixed to the inner peripheral wall of the case, and inside the stator core. A rotor core fixed to the rotor shaft, a pair of side brackets connected to both ends in the axial direction of the case to store the stator core and the rotor core, and a pair of side brackets formed on the inner diameter side of the rotor shaft to penetrate the rotor shaft. A traction motor for vehicles equipped with an inner diameter portion of the bracket, a pair of bearing housings fixed to the outer walls of the pair of side brackets, and a pair of bearings held by the pair of bearing housings to rotatably support the rotor shaft. It is a method of exchanging the pair of bearings. With the bearing housing released from the side bracket and the rotor shaft temporarily supported by the inner diameter of the bracket of the side bracket, the bearing and the bearing housing are pulled out from the rotor shaft. Then, a new bearing and a bearing housing are attached to the rotor shaft, and the bearing housing is fixed to the outer wall of the side bracket.

Further, the bearing structure of the vehicle traction motor according to one aspect of the present invention includes a tubular case, a stator core fixed to the inner peripheral wall of the case, and a rotor fixed to a rotor shaft arranged inside the stator core. A pair of iron cores, a pair of side brackets connected to both ends in the axial direction of the case to store the stator core and rotor core, and a pair of bracket inner diameters formed on the inner diameter side of the pair of side brackets and through which the rotor shaft penetrates. It is provided with a pair of bearing housings fixed to the outer wall of the side bracket and a pair of bearings held by the pair of bearing housings to rotatably support the rotor shaft. Then, when the bearing housing was released from the side bracket and the bearing and the bearing housing were pulled out from the rotor shaft, the inner diameter portion of the bracket of the side bracket temporarily supported the rotor shaft.

Further, the main electric motor for a vehicle according to one aspect of the present invention includes a tubular case, a stator core fixed to the inner peripheral wall of the case, and a rotor core fixed to a rotor shaft arranged inside the stator core. A bracket-side tapered peripheral surface whose diameter gradually increases toward both ends of the rotor shaft is formed on the outer wall, and a pair of side brackets connected to both ends in the axial direction of the case to house the stator core and the rotor core, and A bracket inner diameter portion formed on the inner diameter side of the pair of side brackets and through which the rotor shaft penetrates, and a housing side tapered peripheral surface that abuts on the bracket side tapered peripheral surface in a surface contact state are formed to form a pair of side brackets. A pair of bearing housings fixed to an outer wall and a pair of bearings held by the pair of bearing housings to rotatably support the rotor shaft are provided, and the tapered peripheral surface on the bracket side and the tapered peripheral surface on the housing side are brought into contact with each other. The bearing housing is fixed to the side bracket in this state.

According to the method for replacing a bearing of a traction motor for a vehicle according to the present invention, when the bearing is pulled out from the rotor shaft, the inner diameters of the brackets of the pair of side brackets temporarily support the rotor shaft, so that the bearing is disassembled and maintained. The labor can be significantly reduced.
Further, according to the bearing structure of the traction motor for vehicles and the traction motor for vehicles according to the present invention, it is not necessary to provide a component for holding the rotor shaft that is used only when the bearing is pulled out from the rotor shaft, so that the manufacturing cost can be reduced. Can be planned.

It is an axial half sectional view which shows the traction motor for a vehicle of 1st Embodiment which concerns on this invention. It is a figure which shows the main part of the bearing structure of the traction motor for a vehicle of 1st Embodiment. It is a figure which shows the operation which pulls out the 2nd housing which constitutes the bearing housing in the bearing structure of the traction motor for a vehicle of 1st Embodiment. It is a figure which shows the operation which pulls out a 1st housing which constitutes a bearing housing, and a bearing in the bearing structure of the traction motor for a vehicle of 1st Embodiment. It is a figure which shows the main part of the bearing structure of the traction motor for vehicles of 2nd Embodiment which concerns on this invention. It is a figure which shows the operation of pulling out the bearing with the 1st and 2nd housings constituting the bearing housing in the bearing structure of the traction motor for a vehicle of 2nd Embodiment.

Next, an embodiment according to the present invention will be described with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between the thickness and the plane dimensions, the ratio of the thickness of each layer, etc. are different from the actual ones. Therefore, the specific thickness and dimensions should be determined in consideration of the following explanation. In addition, it goes without saying that the drawings include parts having different dimensional relationships and ratios from each other.
Further, the embodiments shown below exemplify devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention describes the material, shape, structure, and arrangement of constituent parts. Etc. are not specified as the following. The technical idea of the present invention may be modified in various ways within the technical scope specified by the claims stated in the claims.

[First Embodiment]
FIG. 1 shows a vehicle traction motor 1 according to the first embodiment of the present invention, which is attached to a bogie of a railroad vehicle to drive wheels.
The vehicle traction motor 1 is fixed to a cylindrical case 2 made of a metal material, a pair of side brackets 3 and 4 connected at both ends in the axial direction of the case 2, and the inner circumference of the case 2 in the axial direction. A stator core 5 in which a stator coil 5a protrudes from both end surfaces, a rotor core 7 fixed to a rotor shaft 6 with substantially the same axial length inside the stator core 5, and a pair of side brackets 3 and 4. A pair of bearing housings 8 and 9 fixed to an outer wall on the inner diameter side and a pair of bearings 10 and 11 arranged on the inner diameter side of the pair of bearing housings 8 and 9 to rotatably support the rotor shaft 6 are provided. ing.

The pair of bearings 10 and 11 include an annular inner ring 10a and 11a, an outer ring 10b and 11b, and a plurality of rolling elements 10c and 11c, respectively.
One side bracket 3 includes an outer diameter side bracket 13 connected to the axial end portion of the case 2, and a bracket inner diameter portion 15 continuous via the outer diameter side bracket 13 and the intermediate bracket 14.
A sleeve 7a extending outward in the axial direction is formed on the inner diameter of the rotor core 7 in contact with the outer circumference of the rotor shaft 6, and an annular groove 7b is formed on the outer circumference of the sleeve 7a on the end side. ing. A plurality of annular recesses 7c are formed so as to extend in the axial direction at positions outward in the radial direction from the sleeve 7a.

The bracket inner diameter portion 15 extends in the radial direction orthogonal to the axis P of the rotor shaft 6 while being close to the axial end surface of the rotor core 7. The inner diameter portion 15a of the bracket inner diameter portion 15 is inserted into the outer circumference of the sleeve 7a of the rotor core 7. The bracket inner diameter portion 15 is formed with a plurality of annular protrusions 15b that enter into the plurality of annular recesses 7c of the rotor core 7, and a labyrinth structure is adopted by the plurality of annular recesses 7c and the annular protrusions 15b. ing.

Further, on the outer wall of the intermediate bracket 14, the first bracket side tapered peripheral surface 14a is formed on the bracket inner diameter portion 15 side, the second bracket side tapered peripheral surface 14b is formed on the outer diameter side bracket 13 side, and the first bracket An axial straight peripheral surface 14c extending in a direction orthogonal to the axis P is formed between the side tapered peripheral surface 14a and the second bracket side tapered peripheral surface 14b. The first bracket-side tapered peripheral surface 14a and the second bracket-side tapered peripheral surface 14b are surfaces whose diameters are gradually increased from the inner diameter portion 15 of the bracket toward the outer diameter side bracket 13.
Further, the other bracket 4 of the pair of brackets 3 and 4 also has an outer diameter side bracket 13, an intermediate bracket 14 and a bracket inner diameter portion 15 as in the case of the one bracket 3, and the first bracket is attached to the outer wall of the intermediate bracket 14. A bracket-side tapered peripheral surface 14a, a second bracket-side tapered peripheral surface 14b, and a shaft straight peripheral surface 14c are formed.

As shown in FIG. 2, the bearing housing 8 has an annular first housing 16 that abuts on the outer wall of the bracket inner diameter portion 15 and is inserted into the outer periphery of the sleeve 7a of the rotor core 7 to support the bearing 10, and a bearing. It includes an annular second housing 17 that supports the 10 and the first housing 16.
Inside the first housing 16, the axial support surface 16a and the axial support surface 16b are formed as surfaces orthogonal to each other, and one axial side surface of the bearing 10 (left side in FIG. 2) is formed on the axial support surface 16a. ) Are in contact with each other, and the outer circumference of the outer ring 10b is in contact with the axial support surface 16b. A grease pocket 16c for storing grease is formed on the surface of the shaft direct support surface 16a facing the bearing 10. The inner diameter of the first housing 16 is inserted into the outer circumference of the sleeve 7a on which the annular groove 7b is formed. An engaging peripheral groove 20 is formed on the outer periphery of the first housing 16 along the axis P of the rotor shaft 6.

The inner diameter portion of the second housing 17 is inserted into the outer circumference of the rotor shaft 6 via the collar 23. An annular groove 23a is formed on the outer circumference of the collar 23. The second housing 17 is formed by a plane in which the axial direct support surface 17a and the axial support surface 17b are orthogonal to each other. A grease pocket 17e for storing grease is formed on the surface of the axial support surface 17b facing the bearing 10.
On the outer diameter side of the second housing 17, the taper peripheral surface 17c on the first housing side and the taper on the second housing side are in surface contact with the tapered peripheral surface 14a on the first bracket side and the tapered peripheral surface 14b on the second bracket side of the intermediate bracket 14. A peripheral surface 17d is formed. Further, the second housing 17 is formed with a bolt through hole 18 penetrating in the axial direction and a screw hole 19 for moving the housing, and the screw hole closing bolt B2 is screwed into the screw hole 19 for moving the housing. ..

Further, the intermediate bracket 14 is formed with a bracket-side screw hole 14d. The bracket-side screw hole 14d has a first bracket-side tapered peripheral surface 14a and a second bracket-side tapered peripheral surface 14b, and a first housing-side tapered peripheral surface 17c and a second housing-side tapered peripheral surface 17d of the second housing 17. When the axial support surface 17a of the second housing 17 abuts on the other axial side surface of the bearing 10 and the axial support surface 17b of the second housing 17 abuts on the outer ring 10b of the bearing 10, the bolt It faces the through hole 18.
Then, when the housing bolt B1 inserted through the bolt through hole 18 is screwed into the bracket side screw hole 14d of the intermediate bracket 14, the first housing side tapered peripheral surface 17c and the second housing side tapered peripheral surface 17d of the second housing 17 are screwed. Supports the axial direction of the bearing 10 and the first housing 16 with the shaft direct support surface 17a of the second housing 17 in a state of being in close contact with the tapered peripheral surface 14a on the first bracket side and the tapered peripheral surface 14b on the second bracket side. The directional support surface 17b supports the radial direction of the bearing 10.

Further, the other bearing housing 9 of the pair of bearing housings 8 and 9 is also formed in the same shape as the one bearing housing 8 and has an annular number that abuts on the outer wall of the bracket inner diameter portion 15 to support the bearing 11. A housing 16 and an annular second housing 17 that supports the bearing 11 and the first housing 16 are provided.

[Bearing replacement method of the first embodiment]
Next, a method of replacing the pair of bearings 10 and 11 from the vehicle traction motor 1 having the above configuration will be described with reference to FIGS. 2 to 4.
When pulling out one of the bearings 10 from the rotor shaft 6, first, the screw hole closing bolt B2 screwed into the housing moving screw hole 19 is pulled out. Next, the housing bolt B1 screwed into the bracket side screw hole 14d of the intermediate bracket 14 is pulled out from the bracket side screw hole 14d and the bolt through hole 18 and screwed into the housing moving screw hole 19.

Next, as shown in FIG. 3, the amount of screwing of the housing bolt B1 into the housing moving screw hole 19 is increased, and the tip of the housing bolt B1 is brought into contact with the axial circumferential surface 14c of the intermediate bracket 14. , A state in which the first bracket-side tapered peripheral surface 14a and the second bracket-side tapered peripheral surface 14b of the intermediate bracket 14 are separated from the first housing-side tapered peripheral surface 17c and the second housing-side tapered peripheral surface 17d of the second housing 17. Then, the second housing 17 is moved to one end side in the axial direction (right side in FIG. 3) and removed from the outer periphery of the rotor shaft 6. Next, the collar 23 arranged on the outer circumference of the rotor shaft 6 is also removed from the outer circumference of the rotor shaft 6.

Next, as shown in FIG. 4, the engaging claw 22f of the puller 22 is engaged with the engaging peripheral groove 20 of the first housing 16 on one end side of the rotor shaft 6.
The puller 22 includes a screw shaft 22a, a rotary handle 22b provided at one end of the screw shaft 22a, a puller main body 22d provided with a female screw 22c screwed into a male screw of the screw shaft 22a, and an outer periphery of the puller main body 22d. It includes a plurality of engaging members 22e that are connected at equal intervals in the circumferential direction and project outward, and an engaging claw 22f provided at the tip of each engaging member 22e.
A plurality of engaging members 22e are arranged in a state where the screw shaft 22a of the puller 22 is coaxially arranged with the axis P of the rotor shaft 6 and the other end of the screw shaft 22a is in contact with the end surface on one end side of the rotor shaft 6. The engaging claw 22f of the above is engaged with the engaging peripheral groove 20 of the first housing 16.

Next, the screw shaft 22a is rotated in a predetermined direction by operating the rotary handle 22b to move the puller main body 22d to one end side (right side in FIG. 3) of the screw shaft 22a. By moving the plurality of engaging members 22e together with the puller body 22d to one end side of the screw shaft 22a, the engaging peripheral groove 20 is engaged with the engaging claws 22f of the plurality of engaging members 22e. The bearing 10 whose one axial side surface is in contact with the axial direct support surface 16a of the 1 housing 16 and the 1st housing 16 moves to one end side of the rotor shaft 6. As a result, the first housing 16 and the bearing 10 can be pulled out from the outer circumference of the rotor shaft 6.

At this time, the bearing housing 8 (first housing 16, second housing 17) and the rotor shaft 6 from which the bearing 10 is pulled out pass through the sleeve 7a of the rotor core 7 to the inner diameter portion 15a of the bracket inner diameter portion 15 of the side bracket 3. Is temporarily supported.
Further, when the other bearing 11 is pulled out from the rotor shaft 6, the same procedure as the above-described method for pulling out the one bearing 10 from the rotor shaft 6 is performed. Then, the bearing housing 9 (first housing 16, second housing 17) and the rotor shaft 6 from which the bearing 11 is pulled out also pass through the sleeve 7a of the rotor core 7 to the inner diameter portion 15a of the bracket inner diameter portion 15 of the side bracket 3. Temporarily supported.

On the other hand, when mounting the new bearing 10 that has been disassembled and maintained on the vehicle traction motor 1, first, the inner diameter portion of the first housing 16 is mounted on the sleeve 7a of the rotor core 7 and hits the outer wall of the bracket inner diameter portion 15. Get in touch. Next, a new bearing 10 is mounted on the outer circumference of the rotor shaft 6.
Next, after inserting the collar 23 on the outer circumference of the rotor shaft 6, the second housing 17 is mounted on the outer circumference of the collar 23. Then, the second housing 17 moves toward the first housing 16 and the bearing 10 side arranged on the outer periphery of the rotor shaft 6. Then, with the second housing 17 in contact with the outer wall of the intermediate bracket 14, the housing bolt B1 through which the bolt through hole 18 of the second housing 17 is inserted is screwed into the bracket side screw hole 14d of the intermediate bracket 14. As a result, the new bearing 10 is mounted on the vehicle traction motor 1.

At this time, in the bearing 10 supported by the first housing 16 and the second housing 17, the first housing side tapered peripheral surface 17c and the second housing side tapered peripheral surface 17d of the second housing 17 are the first brackets of the intermediate bracket 14. By arranging the side tapered peripheral surface 14a and the second bracket side tapered peripheral surface 14b in surface contact with each other, centering adjustment is performed so as to coincide with the axis P of the rotor shaft 6.
Further, when the other new bearing 11 is disassembled and maintained and mounted on the vehicle traction motor 1, the procedure is the same as the method for mounting the new bearing 10 on the vehicle traction motor 1.

[Effect of the first embodiment]
According to the first embodiment described above, the rotor shaft 6 from which the pair of bearing housings 8 and 9 and the pair of bearings 10 and 11 are pulled out is a rotor on the inner diameter portion 15a of the bracket inner diameter portion 15 of the pair of side brackets 3 and 4. Since it is temporarily supported via the sleeve 7a of the iron core 7, the labor required for disassembling and maintaining the bearings 10 and 11 can be significantly reduced.
Further, the vehicle traction motor 1 of the first embodiment does not need to be provided with a component for supporting the rotor shaft 6 which is used only when the bearings 10 and 11 are pulled out from the rotor shaft 6, and is compared with the conventional vehicle traction motor. Since the number of parts can be reduced, the manufacturing cost can be reduced.

Further, as shown in FIG. 3, the amount of screwing of the housing bolt B1 into the housing moving screw hole 19 is increased, and the tip of the housing bolt B1 is brought into contact with the axial circumferential surface 14c of the intermediate bracket 14. , The second housing 17 can be moved to the end in the axial direction and easily removed from the outer periphery of the rotor shaft 6. Further, as shown in FIG. 4, when the screw shaft 22a is rotated in a predetermined direction and the puller main body 22d is moved to the end side of the screw shaft 22a by operating the rotary handle 22b of the puller 22, the puller main body 22d At the same time, the plurality of engaging members 22e move to one end side of the screw shaft 22a, and the first housing 16 and the bearing 10 (11) move to the end of the rotor shaft 6, so that the first housing 16 And the bearing 10 (11) can also be easily pulled out from the outer periphery of the rotor shaft 6.

When the new bearings 10 and 11 that have been disassembled and maintained are mounted on the vehicle traction motor 1, the first housing side tapered peripheral surface 17c and the second housing side tapered peripheral surface 17d of the second housing 17 are the intermediate brackets 14. The cores of the bearings 10 and 11 are arranged so as to coincide with the axis P of the rotor shaft 6 by being arranged in close contact (surface contact) with the tapered peripheral surface 14a on the first bracket side and the tapered peripheral surface 14b on the second bracket side. Since the feeding adjustment can be performed automatically, the assembly accuracy of the bearings 10 and 11 can be improved.

[Second Embodiment]
Next, FIGS. 5 and 6 show a main part of the bearing structure of the vehicle traction motor 1 according to the second embodiment of the present invention. The same components as those shown in FIGS. 1 to 4 are designated by the same reference numerals, and the description thereof will be omitted.
As shown in FIG. 5, the bearing housing 8 of the present embodiment includes annular first and second housings 25 and 26 that abut against the outer wall of the inner diameter portion 15 of the bracket to support the bearing 10. The first and second housings 25 and 26 have a shape divided into two in the axis P direction of the rotor shaft 6.

Inside the first housing 25, the axial support surface 25a and the axial support surface 25b are formed as surfaces orthogonal to each other, and one axial side surface of the bearing 10 (left side in FIG. 5) is formed on the axial support surface 25a. ) Are in contact with each other, and a part of the outer circumference of the outer ring 10b is in contact with the axial support surface 25b. On the outer periphery of the first housing 25, a first housing-side tapered peripheral surface 25c that comes into contact with the first bracket-side tapered peripheral surface 14a of the intermediate bracket 14 by surface contact is formed.
On the inner diameter side of the second housing 26, the axial direct support surface 26a and the axial support surface 26b are formed as planes orthogonal to each other. The other axial side surface of the bearing 10 is in contact with the axial direct support surface 26a, and the remaining outer periphery of the outer ring 10b is in contact with the axial support surface 26b. A second housing-side tapered peripheral surface 26c that comes into contact with the second bracket-side tapered peripheral surface 14b of the intermediate bracket 14 by surface contact is formed on the outer periphery of the second housing 26.

Bolt through holes 27 and 28 penetrating in the axial direction are formed in the first and second housings 25 and 26, and the housing moving screw holes 14d of the intermediate bracket 14 face the bolt through holes 27 and 28. ing. Then, when the housing bolt B1 inserted through the bolt through holes 27 and 28 is screwed into the bracket-side screw hole 14d of the intermediate bracket 14, the first housing-side tapered peripheral surface 25c of the first housing 25 and the second housing 26 are the first. 2 The first and second housings 25 and 26 support the bearing 10 in a state where the tapered peripheral surface 26c on the housing side is in close contact with the tapered peripheral surface 14a on the first bracket side and the tapered peripheral surface 14b on the second bracket side of the intermediate bracket 14. do.

Further, a connecting screw hole 29 is formed in the first housing 25, and a connecting screw hole 30 corresponding to the connecting screw hole 29 of the first housing 25 is formed through the second housing 26 to form a housing. The first and second housings 25 and 26 are connected by screwing the bolt B3.
Further, the second housing 26 is formed with a screw hole 31 for moving the housing that faces the axially peripheral surface of the intermediate bracket 14 and penetrates in the axial direction, and the screw hole closing bolt B2 is formed in the screw hole 31 for moving the housing. Is screwed in.
Further, although not shown, the other bearing housing 9 of the pair of bearing housings 8 and 9 is also formed in the same shape as the one bearing housing 8 and abuts on the outer wall of the bracket inner diameter portion 15 to support the bearing 11. The annular first and second housings 25 and 26 are provided.

[Bearing replacement method of the second embodiment]
Then, when pulling out one of the bearings 10 from the rotor shaft 6, first, the screw hole closing bolt B2 screwed into the housing moving screw hole 31 is pulled out. Next, the housing bolt B1 screwed into the bracket side screw hole 14d of the intermediate bracket 14 is pulled out from the bracket side screw hole 14d and the bolt through holes 27 and 28, and screwed into the housing moving screw hole 31.

Next, as shown in FIG. 6, the amount of screwing of the housing bolt B1 into the housing moving screw hole 31 is increased, and the tip of the housing bolt B1 is brought into contact with the axial circumferential surface 14c of the intermediate bracket 14. , 1st and 2nd housings 25 and 26, collar 23 and bearing 10 are moved to one end side in the axial direction (right side in FIG. 6) and removed from the outer periphery of the rotor shaft 6.
At this time, the bearing housing 8 (first housing 25, second housing 26) and the rotor shaft 6 from which the bearing 10 is pulled out pass through the sleeve 7a of the rotor core 7 to the inner diameter portion 15a of the bracket inner diameter portion 15 of the side bracket 3. Is temporarily supported.

Further, when the other bearing 11 is pulled out from the rotor shaft 6, the same procedure as the above-described method for pulling out the one bearing 10 from the rotor shaft 6 is performed. Then, the bearing housing 9 (first housing 25, second housing 26) and the rotor shaft 6 from which the bearing 11 is pulled out are connected to the inner diameter portion 15a of the bracket inner diameter portion 15 of the side bracket 4 via the sleeve 7a of the rotor core 7. Temporarily supported.
On the other hand, when mounting the new bearing 10 that has been disassembled and maintained on the vehicle traction motor 1, first, the new bearing 10 with the bearing housings 9 (first housing 25, second housing 26) mounted on the outer periphery is mounted on the rotor shaft. The collar 23 is attached to the inner diameter of the second housing 26 while being attached to the outer periphery of the 6 from one end side. Then, the housing bolt B1 inserted through the bolt through holes 27 and 28 is screwed into the bracket side screw hole 14d of the intermediate bracket 14. As a result, the new bearing 10 is mounted on the vehicle traction motor 1.

At this time, in the bearing 10 supported by the first housing 25 and the second housing 26, the first housing side tapered peripheral surface 25c of the first housing 25 and the second housing side tapered peripheral surface 26c of the second housing 26 are intermediate brackets. By arranging the 14 in a state of being in surface contact with the first bracket-side tapered peripheral surface 14a and the second bracket-side tapered peripheral surface 14b, centering adjustment is performed so as to coincide with the axis P of the rotor shaft 6.
Further, when the other new bearing 11 is disassembled and maintained and mounted on the vehicle traction motor 1, the procedure is the same as the method for mounting the new bearing 10 on the vehicle traction motor 1.

[Effect of the second embodiment]
According to the second embodiment, as in the first embodiment, the rotor shaft 6 from which the pair of bearing housings 8 and 9 and the pair of bearings 10 and 11 are pulled out is the bracket inner diameter portion 15 of the pair of side brackets 3 and 4. Since it is temporarily supported by the inner diameter portion 15a of the rotor via the sleeve 7a of the rotor core 7, the labor required for disassembling and maintaining the bearings 10 and 11 can be significantly reduced.
Further, also in the second embodiment, it is not necessary to provide parts for supporting the rotor shaft 6 when the bearings 10 and 11 are pulled out from the rotor shaft 6, and the number of parts can be reduced as compared with the conventional traction motor for vehicles. Therefore, the manufacturing cost can be reduced.

When the new bearings 10 and 11 that have been disassembled and maintained are mounted on the traction motor 1 for a vehicle, the tapered peripheral surface 25c on the first housing side of the first housing 25 and the tapered peripheral surface 26c on the second housing side of the second housing 26 Is arranged in a state of being in surface contact with the first bracket side tapered peripheral surface 14a and the second bracket side tapered peripheral surface 14b of the intermediate bracket 14, so that the bearings 10 and 11 coincide with the axis P of the rotor shaft 6. Since the centering adjustment can be automatically performed, the assembly accuracy of the bearings 10 and 11 can be improved.

1 Traction motor for vehicles 2 Cases 3 and 4 Side brackets 5 Stator core 6 Rotor shaft 7 Rotor core 7a Sleeve 7b Circular groove 7c Circular recess 8, 9 Bearing housing 10, 11 Bearings 10a, 11a Inner ring 10b, 11b Outer ring 10c, 11c Rolling Moving body 13 Outer diameter side bracket 14 Intermediate bracket 14a First bracket side tapered peripheral surface (bracket side tapered peripheral surface)
14b 2nd bracket side tapered peripheral surface (bracket side tapered peripheral surface)
14c Axis straight peripheral surface 14d Bracket side screw hole 15 Bracket inner diameter part 15a Inner diameter part 15b Ancillary convex part 16 1st housing 16a Axis direct support surface 16b Axial support surface 16c Grease pocket 17 2nd housing 17a Axis direct support surface 17b Axial direction Support surface 17c First housing side tapered peripheral surface (housing side tapered peripheral surface)
17d 2nd housing side tapered peripheral surface (housing side tapered peripheral surface)
17e Grease pocket 18 Bolt through hole 19 Housing screw hole (screw hole)
20 Engagement peripheral groove 22 Puller 22a Thread shaft 22b Rotating handle 22c Female screw 22d Puller body 22e Engagement member 22f Engagement claw 25 First housing 25a Direct support surface 25b Axial support surface 25c 1 Housing side tapered peripheral surface 26 Second housing 26a Axial direct support surface 26b Axial support surface 26c Second housing side tapered peripheral surface 27,28 Bolt through hole 29,30 Connection screw hole 31 Housing movement screw hole B1, B3 Housing bolt B2 Screw hole closing bolt

Claims (11)

A tubular case, a stator core fixed to the inner peripheral wall of the case, a rotor core fixed to a rotor shaft arranged inside the stator core, and the stator core connected to both ends in the axial direction of the case. A pair of side brackets for accommodating the rotor core, an inner diameter portion of the bracket formed on the inner diameter side of the pair of side brackets and penetrating the rotor shaft, and a pair fixed to the outer wall of the pair of side brackets. A method of exchanging the pair of bearings of a vehicle main motor provided with the bearing housing and the pair of bearings held by the pair of bearing housings to rotatably support the rotor shaft.
A step of removing the bearing and the bearing housing from the rotor shaft in a state where the bearing housing is released from the side bracket and the rotor shaft is temporarily supported by the bracket inner diameter portion of the side bracket.
A method for replacing a bearing of a traction motor for a vehicle, which comprises a step of mounting a new bearing and the bearing housing on the rotor shaft and fixing the bearing housing to the outer wall of the side bracket. The outer wall of the side bracket is formed with a bracket-side tapered peripheral surface whose diameter gradually increases toward the end of the rotor shaft, and the bearing housing is in surface contact with the bracket-side tapered peripheral surface. A tapered peripheral surface on the housing side that comes into contact is formed.
When the new bearing is mounted on the rotor shaft, the bearing housing is fixed to the side bracket in a state where the tapered peripheral surface on the bracket side and the tapered peripheral surface on the housing side are in contact with each other. The method for replacing a bearing of a vehicle traction motor according to claim 1, wherein the centering adjustment is performed. The bearing housing includes a first housing that abuts on the inner diameter of the bracket and holds the bearing, and a second housing that holds the bearing adjacent to the first housing at a position separated from the inner diameter of the bracket. The first housing is formed with an engaging peripheral groove on the outer periphery in the axial direction, and the second housing is formed with a screw hole penetrating toward the outer wall of the side bracket.
In the process of removing the bearing and the bearing housing from the rotor shaft,
The fixing of the first housing and the second housing to the side bracket and the fixing between the first housing and the second housing are released.
The tip of the bolt screwed into the screw hole of the second housing is brought into contact with the outer wall of the side bracket, and the screwing amount of the bolt into the screw hole is increased to bring the second housing to the end of the rotor shaft. While moving to the department side
The engaging claw of the puller arranged at the end of the rotor shaft is engaged with the engaging peripheral groove of the first housing, and the first housing and the bearing are brought together with the engaging claw by operating the puller. The method for replacing a bearing of a traction motor for a vehicle according to claim 1 or 2, wherein the rotor shaft is moved to the end side. The bearing housing includes a first housing that abuts on the inner diameter of the bracket and holds the bearing, and a second housing that holds the bearing adjacent to the first housing at a position separated from the inner diameter of the bracket. The second housing is formed with a screw hole penetrating toward the outer wall of the side bracket.
In the process of removing the bearing and the bearing housing from the rotor shaft,
The first housing and the second housing are released from the side brackets, and both the first housing and the second housing are fixed.
The tip of the bolt screwed into the screw hole of the second housing is brought into contact with the outer wall of the side bracket, and the screwing amount of the bolt into the screw hole is increased to increase the screwing amount of the bolt into the screw hole, thereby causing the first housing, the second housing and the bearing. The method for replacing a bearing of a traction motor for a vehicle according to claim 1 or 2, wherein the rotor shaft is moved to the end side. With a tubular case
A stator core fixed to the inner peripheral wall of the case,
A rotor core fixed to a rotor shaft arranged inside the stator core, and
A pair of side brackets connected to both ends in the axial direction of the case to house the stator core and the rotor core, and
A bracket inner diameter portion formed on the inner diameter side of the pair of side brackets and through which the rotor shaft penetrates,
A pair of bearing housings fixed to the outer wall of the pair of side brackets,
A pair of bearings that are held in the pair of bearing housings and rotatably support the rotor shaft.
When the bearing housing is released from the side bracket and the bearing and the bearing housing are pulled out from the rotor shaft, the bracket inner diameter portion of the side bracket temporarily supports the rotor shaft. Bearing structure of the traction motor for vehicles. The outer wall of the side bracket is formed with a bracket-side tapered peripheral surface whose diameter gradually increases toward both ends of the rotor shaft, and the bearing housing is in surface contact with the bracket-side tapered peripheral surface. A tapered peripheral surface on the housing side that comes into contact is formed.
5. The bearing is characterized in that the centering adjustment of the bearing is performed by fixing the bearing housing to the side bracket in a state where the tapered peripheral surface on the bracket side and the tapered peripheral surface on the housing side are in contact with each other. Bearing structure of the described vehicle traction motor. Each of the pair of bearing housings has a first housing that abuts on the outer wall of the inner diameter of the bracket and abuts on one axial end face and the outer circumference of the bearing, and the other axial end face and the first housing of the bearing. A second housing having a housing-side tapered peripheral surface that abuts on the outer periphery of the bracket and abuts on the bracket-side tapered peripheral surface in a surface contact state, and a housing that penetrates the first housing and the second housing. The bearing structure for a main electric motor for a vehicle according to claim 6, wherein the first and second housings support the bearing by screwing the bearing bolt into the side bracket. Each of the pair of bearing housings is divided into two in the axial direction, and the first housing having a first bracket-side tapered peripheral surface in surface contact with a part of the bracket-side tapered peripheral surface and the bracket-side tapered peripheral surface. A second housing having a tapered peripheral surface on the second bracket side that comes into surface contact with the other part is provided.
The first housing abuts on the outer wall of the inner diameter portion of the bracket and abuts on one axial end surface of the bearing and a part of the outer circumference.
The second housing abuts on the other axial end face of the bearing and the other part of the outer circumference.
The vehicle according to claim 6, wherein the first housing and the housing bolt penetrating the second housing are screwed into the side bracket so that the first and second housings support the bearing. Bearing structure of the traction motor. With a tubular case
A stator core fixed to the inner peripheral wall of the case,
A rotor core fixed to a rotor shaft arranged inside the stator core, and
A bracket-side tapered peripheral surface whose diameter gradually increases toward both ends of the rotor shaft is formed on the outer wall, and a pair of sides connected to both ends in the axial direction of the case to house the stator core and the rotor core. Bracket and
A bracket inner diameter portion formed on the inner diameter side of the pair of side brackets and through which the rotor shaft penetrates,
A pair of bearing housings formed with a housing-side tapered peripheral surface that abuts on the bracket-side tapered peripheral surface in a surface contact state and fixed to the outer wall of the pair of side brackets.
A pair of bearings that are held in the pair of bearing housings and rotatably support the rotor shaft.
A traction motor for a vehicle, wherein the bearing housing is fixed to the side bracket in a state where the tapered peripheral surface on the bracket side and the tapered peripheral surface on the housing side are in contact with each other. Each of the pair of bearing housings has a first housing that abuts on the outer wall of the inner diameter of the bracket and abuts on one axial end face and the outer circumference of the bearing, and the other axial end face and the first housing of the bearing. A second housing having a housing-side tapered peripheral surface that abuts on the outer periphery of the bearing and abuts on the bracket-side tapered peripheral surface in a surface contact state, and a housing that penetrates the first housing and the second housing. The main electric motor for a vehicle according to claim 9, wherein the first and second housings support the bearing by screwing the bolt into the side bracket. Each of the pair of bearing housings is divided into two in the axial direction, and the first housing having a first bracket-side tapered peripheral surface in surface contact with a part of the bracket-side tapered peripheral surface and the bracket-side tapered peripheral surface. A second housing having a tapered peripheral surface on the second bracket side that comes into surface contact with the other part is provided.
The first housing abuts on the outer wall of the inner diameter portion of the bracket and abuts on one axial end surface of the bearing and a part of the outer circumference.
The second housing abuts on the other axial end face of the bearing and the other part of the outer circumference.
The vehicle according to claim 9, wherein the first housing and the housing bolt penetrating the second housing are screwed into the side bracket so that the first and second housings support the bearing. Traction motor.

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