JP2022068522A - Bearing replacement method and main motor for vehicle - Google Patents

Abstract

To provide a bearing replacement method of a main motor for a vehicle, which secures stable holding power for a rotor shaft when a bearing is disassembly-maintained and can reduce manufacture cost by eliminating preparation for disassembly maintenance of the bearing.SOLUTION: A bearing 13 is pulled out from a rotor shaft in a state in which a temporary support member 40 which is detachably attached to an inner diameter side frame part 26 is moved toward a partition member 9 and the inner diameter side frame part temporarily supports the rotor shaft 5 via the temporary support member. Then, the new bearing is installed on the rotor shaft and the temporary support member is returned to an original installation position of the inner diameter side frame part to release temporary support of the rotor shaft.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for replacing bearings of a fully closed vehicle traction motor for driving a railway vehicle and a vehicle traction motor.

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 vehicle main motor of Patent Document 1 has a stator core fixed to the inner peripheral side of a substantially cylindrical cover (referred to as a frame in Cited Document 1) and a pair of frames (Cited Document 1) that close both ends of the cover. A pair of bearings that are detachably mounted on a pair of frames and a rotor shaft that is placed inside the cover and rotatably supported by the pair of bearings (referred to as brackets and end plates) (rotor shaft in Reference 1). The rotor core is located inside the stator core and fixed to the rotor shaft, and the rotor core is fixed to the rotor shaft on both sides of the rotor core and extends with an upward inclination toward the pair of frames. It is a device provided with a pair of partition plates.

The grease filled in the bearings of the traction motor for vehicles tends to gradually deteriorate because the heat inside the machine and the dust in the outside air invade the inside of 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 periodical disassembly and maintenance of the bearing to obtain the grease in the optimum state containing the base oil sufficiently.

In the traction motor for vehicles of Patent Document 1, fixing screw holes penetrating in the axial direction of the rotor shaft are formed in a pair of frames, and when disassembling and maintaining the bearing, the fixing screw member is fixed from outside the machine. The rotor shaft is held through the pair of partition plates by screwing into the screw holes and pressing the tip of the fixing screw member against the inclined side surfaces of the pair of partition plates. As a result, the bearing can be replaced without completely disassembling the stator core, rotor core, rotor shaft, etc. of the traction motor.

Japanese Patent No. 571823

By the way, when disassembling and maintaining a bearing in a vehicle traction motor according to Patent Document 1, if the force with which the tip of the fixing screw member presses against the inclined side surface of the partition plate is small, the holding force of the rotor shaft decreases. There is a risk. On the contrary, if the pressing force of the tip of the fixing screw member is excessively large, the side surface of the partition plate may be damaged.

Further, when disassembling and maintaining the bearing, it is necessary to take out the fixing screw member from another place, which causes a problem that preparation for disassembly and maintenance is troublesome.

Therefore, the present invention has been made in view of the above circumstances, and secures a stable holding force for the rotor shaft when disassembling and maintaining the bearing, and does not require preparation for disassembling and maintaining the bearing. It is an object of the present invention to provide a bearing replacement method for a traction motor for a vehicle and a traction motor for a vehicle, which can reduce the manufacturing cost.

In order to achieve the above object, the bearing replacement method for the traction motor for a vehicle according to one aspect of the present invention is arranged inside the tubular cover, the stator core fixed to the inner peripheral wall of the cover, and the stator core. A rotor core fixed to the rotor shaft, a pair of frames connected to both ends in the axial direction of the cover to house the stator core and the rotor core, and a tubular inner diameter side frame portion formed on the inner diameter side of the pair of frames. A pair of bearings that are detachably mounted on the rotor shaft and rotatably support the rotor shaft, and are fixed to the rotor shaft at both ends in the axial direction of the rotor core to partition the pair of frames from the stator core and the rotor core. It is a method of exchanging the pair of bearings of a vehicle traction motor provided with a pair of partition members. In the bearing replacement method of the present invention, the temporary support member detachably attached to the inner diameter side frame portion is moved toward the partition member, and the inner diameter side frame portion temporarily supports the rotor shaft via the temporary support member. The process of removing the bearing from the rotor shaft and the process of mounting the new bearing on the rotor shaft and then returning the temporary support member to the original mounting position of the inner diameter side frame to release the temporary support of the rotor shaft. I have.

Further, the vehicle traction motor according to one aspect of the present invention includes a cylindrical cover, a stator core fixed to the inner peripheral wall of the cover, and a rotor core arranged inside the stator core and fixed to the rotor shaft. A pair of frames connected to both ends in the axial direction of the cover to house the stator core and the rotor core, and a cylindrical inner diameter side frame formed on the inner diameter side of the pair of frames are detachably attached to the rotor shaft. A pair of bearings that rotatably support, a pair of partition members that are fixed to the rotor shaft on both ends in the axial direction of the rotor core and partition between the pair of frames, the stator core, and the rotor core, and the inner diameter side frame portion. A temporary support member that can be detachably attached to the rotor shaft so that the pair of bearings can be replaced while the inner diameter side frame part temporarily supports the rotor shaft via the temporary support member by engaging with the partition member. It is equipped with.

According to the method for replacing a bearing of a traction motor for a vehicle and the traction motor for a vehicle according to the present invention, it is possible to secure a stable holding force for the rotor shaft when disassembling and maintaining the bearing, and disassembling and maintaining the bearing. It is possible to reduce the manufacturing cost by eliminating the need for preparation for the bearing.

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 temporary support member attached to the inner diameter side frame part in the bearing structure of the traction motor for a vehicle of 1st Embodiment. It is a side view of a temporary support member. It is the figure which looked at the inner diameter side frame part which attached the temporary support member from the axial direction. It is a figure which shows the state which the inner diameter side frame part temporarily supports a rotor shaft via a temporary support member in the traction motor for a vehicle of 1st 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 parts having different dimensional relationships and ratios are included between the drawings.

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 described in the claims.

FIG. 1 is 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 main electric motor 1 for a vehicle has a cylindrical cover 2, a cylindrical stator core 3, a stator coil 4 protruding from both end faces in the axial direction of the stator core 3, and substantially the same shaft inside the stator core 3. A pair of disc-shaped rotor cores 6 fixed to the rotor shaft 5 with a directional length and a pair of discs arranged at both ends of the cover 2 in the axial direction so as to cover both ends of the stator core 3 and the rotor core 6 in the axial direction. A pair of bearing housings 11 and 12 fixed to the inner diameter side of the pair of frames 7 and 8 and holding a pair of bearings 13 and 14 arranged on the outer periphery of the rotor shaft 5 are provided. There is.

The pair of bearings 13, 14 includes an annular shaped inner ring 13a, 14a, an outer ring 13b, 14b, and a plurality of rolling elements 13c, 14c, respectively.

A plurality of air passage walls 3a projecting outward in the radial direction are formed on the outer periphery of the stator core 3 at predetermined intervals in the circumferential direction, and the outer peripheral end faces of the plurality of air passage walls 3a are the inner circumferences of the cover 2. By joining to the surface, the stator core 3 is fixed to the inner peripheral surface of the cover 2. The space formed between the air passage walls 3a adjacent to each other in the circumferential direction is an internal air circulation path in which the internal air of the space in which the stator core 3 and the rotor core 6 are arranged circulates.

The space between one frame 7 and the stator core 3 (and the rotor core 6) is partitioned by a disk-shaped first partition member 9, and between the other frame 8 and the stator core 3 (and the rotor core 6). The space is partitioned by a disk-shaped second partition member 10.

The first partition member 9 is composed of a rotor side partition portion 15 and a cover side partition portion 16. The base end side of the rotor side partition portion 15 is fixed to one end surface of the rotor core 6 with a connecting bolt B1 and is radially outwardly orthogonal to the axis P of the rotor shaft 5 from the base end side and is separated from the rotor core 6. It extends diagonally.

The base end side of the cover side partition portion 16 is fixed to one axial end surface of the cover 2 and extends inward in the radial direction orthogonal to the axis P, and is rotatably engaged with the tip of the rotor side partition portion 15. It fits. The tip portions of the rotor-side partition portion 15 and the cover-side partition portion 16 are connected to each other so as to be rotatable relative to each other by providing a labyrinth portion 17 in which annular convex portions formed with each other are engaged with each other with a minute gap.

A supported portion 49 is formed on the side facing one frame 7 of the rotor side partition portion 15. The supported portion 49 has a first supported surface 50 having a peripheral surface extending along the axis P direction and a band ring extending continuously to the first supported surface 50 in a direction orthogonal to the axis P. It is composed of a second supported surface 51 having a shape.

The second partition member 10 is also composed of a rotor-side partition portion 21 having the same structure as the rotor-side partition portion 15 of the first partition member 9, and a cover-side partition portion 22. The rotor side partition portion 21 has a base end side fixed to the other end surface of the rotor core 6 with a connecting bolt B2, and is radially outwardly orthogonal to the axis P from the base end side in an oblique direction away from the rotor core 6. It is postponed. The base end side of the cover side partition portion 22 is fixed to the other axial end surface of the cover 2 and extends inward in the radial direction orthogonal to the axis P, and is rotatably engaged with the tip of the rotor side partition portion 21. It fits. The tip portions of the rotor side partition portion 21 and the cover side partition portion 22 are connected to each other so as to be rotatable relative to each other by providing a labyrinth portion 23 in which the annular convex portions formed with each other are engaged with each other with a minute gap.

A supported portion 49 composed of a first supported surface 50 and a second supported surface 51 is also formed on the side of the rotor side partition portion 21 facing the other frame 8.

In the rotor side partition portion 15 of the first partition member 9, a plurality of internal air blades 18 are formed on the surface facing the stator core 3 (and the rotor core 6) at predetermined intervals in the circumferential direction. Further, a plurality of outside air blades 19 are formed on the surface of the rotor side partition portion 15 facing the frame 7 at predetermined intervals in the circumferential direction. The space between the first partition member 9 on which the outside air wings 19 are arranged and the one frame 7 is the outside air passage 20.

The rotor-side partition portion 21 of the second partition member 10 does not have the inside air blade 18 and the outside air blade 19 formed in the rotor-side partition portion 15 of the first partition member 9. The space between the second partition member 10 and the other frame 8 is an outside air passage 24.

Further, as described above, the internal air circulation path is formed between the air passage walls 3a adjacent to the outer periphery of the stator core 3 in the circumferential direction. An outside air circulation path communicating with the above-mentioned outside air passages 20 and 24 is also formed.

Then, when the rotor side partition portion 15 of the rotor core 6 and the first partition member 9 fixed to the rotor core 6 rotates with the rotation of the rotor shaft 5, the inner air blade 18 and the outside air provided in the rotor side partition portion 15 are used. An air flow is generated by the wings 19, and the air in the space where the stator core 3 and the rotor core 6 are arranged circulates through the inside air circulation passage, and the air taken in from the outside passes through the outside air passage 20, the outside air circulation passage, and the outside air circulation passage. After passing through the outside air passage 24, the air is exhausted to the outside.

One of the frames 7 and 8 of the pair of frames 7 and 8 has an outer diameter side frame portion 25 connected to one end surface in the axial direction of the cover 2 and extending in a direction orthogonal to the axis P, and an outer diameter side. A frame portion 26 on the inner diameter side, which is continuously formed on the inner diameter side of the frame portion 25 and to which the bearing housing 11 is fixed, is provided. The inner diameter side frame portion 26 extends inward in the radial direction while being inclined in an oblique direction close to the rotor core 6 from the inner diameter side end portion of the outer diameter side frame portion 25.

As shown in FIG. 2, the bearing housing 11 that holds the bearing 13 includes first to fourth housings 30 to 33.

The first housing 30 is fitted to the outer periphery of the rotor shaft 5 in a state of being in contact with the stepped surface 5a formed on the rotor shaft 5 on the rotor core 6 side, and is in contact with one end surface of the inner ring 13a. Have been placed.

The second housing 31 is arranged in a state of being in contact with a plurality of surfaces of the inner diameter side frame portion 26 facing the rotor shaft 5 and in contact with one end surface and the outer peripheral surface of the outer ring 13b. The first housing 30 and the second housing 31 are rotatably connected to each other by providing a labyrinth portion 34 in which annular convex portions formed with each other are engaged with each other with a minute gap. Bolt through holes 31a and screw holes 26a are coaxially formed along the axis P in the inner diameter side frame portion 26 and the second housing 31, and the connecting bolt B3 inserted through the bolt through holes 31a is screwed into the screw holes 26a. As a result, the second housing 31 is fixed to the inner diameter side frame portion 26.

The third housing 32 is arranged in contact with the other end surface of the outer ring 13b. A screw hole 31b and a bolt through hole 32a are formed coaxially along the axis P in the second housing 31 and the third housing 32, and the connecting bolt B4 inserted through the bolt through hole 32a is inserted into the screw hole 31b. By screwing in, the third housing 32 is fixed to the second housing 31.

The fourth housing 33 is fitted to the outer periphery of the rotor shaft 5 with the inner diameter side of the third housing 32 covered from the outside (right side in FIG. 2), and is arranged in a state of being in contact with the other end surface side of the inner ring 13a. ing. The third housing 32 and the fourth housing 33 are rotatably connected to each other by providing a labyrinth portion 35 in which annular convex portions formed with each other are engaged with each other with a minute gap.

Here, as shown in FIG. 2, a plurality of temporary support members 40 are mounted on the inner diameter side frame portion 26 on a part of the peripheral surface side of the first partition member 9 facing the rotor side partition portion 15. ..

As shown in FIG. 3, on the peripheral surface of the inner diameter side frame portion 26 facing the rotor side partition portion 15, the peripheral surface extends along the axis P on the distal end side close to the rotor side partition portion 15. Axial peripheral surface 41, an inclined peripheral surface 42 having an upward inclination continuously from the first axial peripheral surface 41, and an inclined peripheral surface 42 extending from the inclined peripheral surface 42, and continuous circumference along the axis P from the inclined peripheral surface 42. A second axial peripheral surface 43 having an extending surface and a band ring-shaped axial peripheral surface 44 extending continuously from the second axial peripheral surface 43 in a direction orthogonal to the axis P are formed. ing.

At the uppermost portion of the peripheral surface 41 in the first axial direction, a dovetail tenon 52 is formed so as to extend in the P direction of the axis. Further, an ant tenon (not shown) is also formed at the lowermost portion of the peripheral surface 41 in the first axial direction so as to extend in the P direction of the axis.

The temporary support member 40 is attached to the uppermost portion of the inner diameter side frame portion 26 shown in FIG. 2 and the lowermost portion of the inner diameter side frame portion 26 (not shown).

As shown in FIG. 3, the temporary support member 40 mounted on the uppermost portion of the inner diameter side frame portion 26 includes a first slide portion 45 that slides on the first axial peripheral surface 41 of the inner diameter side frame portion 26. A second slide portion 47 that slides on the second axial peripheral surface 43 by providing a contact / detachment surface 46 that is in contact with the peripheral surface 44 in the axial direction is connected between the first slide portion 45 and the second slide portion 47. It is provided with a connecting portion 48 that is brought into contact with and separated from the inclined peripheral surface 42.

On the slide surface of the first slide portion 45 of the temporary support member 40, a dovetail hole 53 with which the dovetail tenon 52 of the peripheral surface 41 in the first axial direction engages is formed so as to extend in the axis P direction. Further, a temporary support portion 56 is formed at the tip end portion of the first slide portion 45, and the temporary support portion 56 has a first support surface 54 having a peripheral surface extending along the axis P and a first support surface. It is composed of a second support surface 55 that is continuous with 54 and extends in a direction orthogonal to the axis P.

As shown in FIG. 4, the second slide portion 47 of the temporary support member 40 is formed with a screw hole 47a opened at the contact / detachment surface 46. When the temporary support member 40 is attached to the uppermost portion of the inner diameter side frame portion 26, as shown in FIG. 2, the bolt through hole 26b formed in the inner diameter side frame portion 26 is positioned coaxially with the screw hole 47a, and the temporary support bolt is provided. By inserting B5 into the bolt through hole 36b and then screwing it into the screw hole 47a, the temporary support member 40 is fixed to the inner diameter side frame portion 26.

FIG. 5 is a view showing the main part of the inner diameter side frame portion 26 from the outside, and is directed toward the contact / detachment surface 46 of the second slide portion 47 of the temporary support member 40 near the position where the bolt through hole 26b is formed. A temporary support screw hole 26c is formed through the hole. The temporary support bolt B5 screwed into the screw hole 47a of the second slide portion 47 can be screwed into the temporary support screw hole 26c. The contact / separation surface 46 of the second slide portion 47 of the temporary support member 40 facing the temporary support screw hole 26c of the inner diameter side frame portion 26 is a flat surface having no holes or the like.

Further, the shape of the lowermost portion of the inner diameter side frame portion 26 and the temporary support member attached to this portion also have the shape of the uppermost portion of the inner diameter side frame portion 26 described above and the temporary support member attached to this portion. It is formed with the same structure as 40.

On the other hand, of the pair of frames 7 and 8, the other frame 8 is also continuously formed on the outer diameter side frame portion 25 having the same structure as the one frame 7 and the inner diameter side of the outer diameter side frame portion 25, and the bearing housing 12 is formed. A frame portion 26 on the inner diameter side to which is fixed is provided.

The bearing housing 12 that holds the bearing 14 also includes first to fourth housings 30 to 33 having the same structure as the bearing housing 11. The temporary support member 40 described above is attached to the uppermost portion and the lowermost portion of the inner diameter side frame portion 26.

Next, a method of replacing the pair of bearings 13 and 14 from the vehicle traction motor 1 having the above configuration will be described with reference to FIGS. 1, 2 and 3. The temporary support members 40 of the present embodiment are arranged at two locations, the uppermost portion and the lowermost portion of the inner diameter side frame portions 26 of the pair of frames 7 and 8, and in the following description, the uppermost temporary support members 40 are arranged. However, the same operation shall be performed for the temporary support member 40 at the lowermost portion.

When pulling out one of the bearings 13 from the rotor shaft 5, first, the temporary support bolt B5 screwed into the screw hole 47a of the second slide portion 47 of the temporary support member 40 is inserted from the screw hole 47a and the bolt through hole 26b. Pull out. As a result, the temporary support member 40 is released from being fixed to the inner diameter side frame portion 26.

Next, the temporary support bolt B5 extracted from the screw hole 47a and the bolt through hole 26b is screwed into the temporary support screw hole 26c formed near the bolt through hole 26b of the inner diameter side frame portion 26.

When the amount of the temporary support bolt B5 screwed into the temporary support screw hole 26c is increased, the tip of the temporary support bolt B5 that has passed through the temporary support screw hole 26c becomes the second slide portion 47 of the temporary support member 40. The temporary support member 40 abuts and presses against the contact / detachment surface 46, and the first slide portion 45 slides on the peripheral surface 41 in the first axial direction, and the second slide portion 47 slides on the peripheral surface 43 in the second axial direction. However, by engaging the dovetail hole 53 of the first slide portion 45 with the dovetail tenon 52 of the first axial peripheral surface 41 of the inner diameter side frame portion 26, the dovetail hole 53 moves in the axis P direction toward the rotor side partition portion 15. go.

Then, by bringing the temporary support member 40 close to the rotor side partition portion 15, as shown in FIG. 6, the temporary support portion 56 whose peripheral surface extends along the axis P provided at the tip of the first slide portion 45. The first supported surface 54 constituting the rotor side abuts on the first supported surface 50 constituting the supported portion 49 of the rotor side partition portion 15 in a surface contact state, and is in a direction orthogonal to the axis P of the first slide portion 45. The second support surface 55 constituting the extending temporary support portion 56 comes into contact with the second supported surface 51 constituting the supported portion 49 of the rotor side partition portion 15 in a surface contact state.

Next, as shown in FIG. 6, in the member constituting the bearing housing 11, the connecting bolt B3 fixing the second housing 31 to the inner diameter side frame portion 26 is removed from the screw hole 26a. Further, the connecting bolt B4 fixing the third housing 32 to the second housing 31 is removed from the screw hole 31b.

Next, by moving the second housing 31 toward the end of the rotor shaft 5, the third housing 32, the fourth housing 33, and the bearing 13 can be pulled out from the outer periphery of the rotor shaft 5.

At this time, the bearing housings 11 (second to fourth housings 31 to 33) and the rotor shaft 5 from which the bearing 13 is pulled out are on the inner diameter side frame portion 26 of the frame 7, and the temporary support portions 56 and the first of the temporary support members 40. 1 It is temporarily supported via the supported portion 49 of the rotor side partition portion 15 of the partition member 9.

Further, when the other bearing 14 is pulled out from the rotor shaft 5, the same procedure as the above-mentioned method for pulling out the one bearing 13 from the rotor shaft 5 is performed. The bearing housings 12 (second to fourth housings 31 to 33) and the rotor shaft 5 from which the bearing 14 is pulled out also have the temporary support portion 56 and the second temporary support member 40 of the temporary support member 40 on the inner diameter side frame portion 26 of the frame 8. It is temporarily supported via the supported portion 49 of the rotor side partition portion 21 of the partition member 10.

On the other hand, when the new bearing 13 disassembled and maintained is mounted on the vehicle traction motor 1, first, the second housing 31 is mounted on the outer periphery of the rotor shaft 5, and the second housing 31 is fitted in the screw hole 26a of the inner diameter side frame portion 26. 2 Screw the connecting bolt B3 that penetrates the bolt through hole 26b of the housing 31. Next, a new bearing 13 is mounted on the outer periphery of the rotor shaft 5, and a third housing 32 is mounted so as to cover the new bearing 13, and then the bolt penetration of the third housing 32 is inserted into the screw hole 31b of the second housing 31. The connecting bolt B4 that penetrates the hole 32a is screwed in. Next, the fourth housing 33 is mounted on the outer periphery of the rotor shaft 5.

Next, the temporary support bolt B5 screwed into the temporary support screw hole 26c of the inner diameter side frame portion 26 is removed. Then, the temporary support bolt B5 is inserted into the bolt through hole 26b of the inner diameter side frame portion 26, and then screwed into the screw hole 26a of the second slide portion 47 of the temporary support member 40. When the temporary support bolt B5 is screwed into the screw hole 26a, the dovetail hole 53 of the first slide portion 45 slides the dovetail groove 52 of the first axial direction peripheral surface 41, and the second slide portion 47 slides on the second axial direction peripheral surface. The temporary support member 40 separates from the rotor side partition portion 15 while sliding to, and is attached to the inner diameter side frame portion 26. As a result, the engagement between the supported portion 49 of the rotor side partition portion 15 of the first partition member 9 and the temporary support portion 56 of the temporary support member 40 is released, so that the temporary support of the temporary support member 40 is released. ..

Further, when the other bearing 14 that has been disassembled and maintained is mounted on the vehicle traction motor 1, the procedure is the same as the procedure for mounting the new bearing 13 that has been disassembled and maintained on the rotor shaft 5.

Next, the effect of this embodiment will be described.

When the rotor shaft 5 is temporarily supported, the portion where the temporary support member 40 and the rotor side partition portion 15 of the first partition member 9 (rotor side partition portion 21 of the second partition member 10) comes into contact is the temporary support member 40. The temporary support portion 56 (first support surface 54, second support surface 55) is in a surface contact state with the supported portions 49 (first supported surface 50, second supported surface 51) of the rotor side partition portions 15 and 21. Since the bearings are in contact with each other, the rotor shaft 5 can be temporarily supported with sufficient holding force, and the bearings 13 and 14 can be disassembled and maintained in a short time.

Further, the first support surface 54 of the temporary support member 40 extending along the axis P direction and the first supported surfaces 50 of the rotor side partition portions 15 and 21 come into contact with each other, and the first support surface 54 and the first cover are in contact with each other. Since the second support surface 55 and the second supported surface 51 extending in the direction perpendicular to the axis perpendicular to the support surface 50 are in contact with each other, the rotor side partition portions 15 and 21 which are rotating bodies can be stably held. Can be retained.

Further, when the temporary support member 40 moves toward the rotor side partition portions 15 and 21, the first slide portion 45 slides on the peripheral surface 41 in the first axial direction, and the second slide portion 47 slides in the second axial direction. While sliding to the peripheral surface 43, the dovetail hole 53 of the first slide portion 45 is engaged with the dovetail tenon 52 of the peripheral surface 41 in the first axial direction of the inner diameter side frame portion 26, so that the temporary support member 40 is on the rotor side. It can be moved in the axis P direction toward the partition portions 15 and 21.

Further, the temporary support bolt B5 fixing the temporary support member 40 is screwed into the temporary support screw holes 26c formed in the rotor side partition portions 15 and 21, and the screwing amount of the temporary support bolt B5 is increased. The tip of the temporary support bolt B5 that has passed through the temporary support screw hole 26c is pressed against the contact / separation surface 46 of the second slide portion 47 of the temporary support member 40, and the temporary support member 40 is pressed against the rotor side partition portion 15. , 21 is moved in the P direction of the axis. By using the temporary support bolt B5 fixing the temporary support member 40 as the moving member of the temporary support member 40 in this way, it is not necessary to prepare the moving member when disassembling and maintaining the bearings 13 and 14. Therefore, it is possible to reduce the manufacturing cost.

1 Main motor for vehicles, 2 Cover, 3 Stator core, 3a Air passage wall, 4 Stator coil, 5 Rotor shaft, 5a Step surface, 6 Rotor core, 7, 8 frame, 9 1st partition member, 10 2nd partition member , 11, 12 Bearing housing, 13, 14 bearings, 13a, 14a inner ring, 13b, 14b outer ring, 13c, 14c rolling elements, 15 rotor side partition, 16 cover side partition, 17 labyrinth part, 18 inner air wing, 19 Outside air wing, 20 outside air passage, 21 rotor side partition, 22 cover side partition, 23 labyrinth part, 24 outside air passage, 25 outer diameter side frame part, 26 inner diameter side frame part, 26a screw hole, 26b bolt through hole, 26c Temporary support screw holes, 30 1st housing, 31 2nd housing, 31a bolt through hole, 31b screw hole, 32 3rd housing, 32a bolt through hole, 33 4th housing, 34 labyrinth part, 35 labyrinth part, 40 Temporary support member, 41 1st axial peripheral surface, 42 inclined peripheral surface, 43 2nd axial peripheral surface, 44 axial normal peripheral surface, 45 1st slide part, 46 contact / detachment surface, 47 2nd slide part, 47a Screw hole, 48 Connection part, 49 Supported part, 50 First supported surface, 51 Second supported surface, 52 Dovetail groove, 53 Dovetail hole, 54 First support surface, 55 Second support surface, 56 Temporary support part , B1 connecting bolt, B2 connecting bolt, B3 connecting bolt, B4 connecting bolt, B5 temporary support bolt, P axis

Claims (13)

With a cylindrical cover,
A stator core fixed to the inner peripheral wall of the cover, and
A rotor core arranged inside the stator core and fixed to the rotor shaft,
A pair of frames connected to both ends in the axial direction of the cover and accommodating the stator core and the rotor core,
A pair of bearings that are detachably attached to the inner diameter side frame portion of the tubular shape formed on the inner diameter side of the pair of frames and rotatably support the rotor shaft.
The vehicle traction motor including a pair of frames fixed to the rotor shaft at both ends in the axial direction of the rotor core and a pair of partitioning members partitioning the stator core and the rotor core. It is a method of exchanging a pair of bearings.
The temporary support member detachably attached to the inner diameter side frame portion is moved toward the partition member, and the inner diameter side frame portion temporarily supports the rotor shaft via the temporary support member. The process of removing the bearing from the rotor shaft and
After mounting a new bearing on the rotor shaft, the temporary support member is returned to the original mounting position of the inner diameter side frame portion to release the temporary support of the rotor shaft. How to replace the bearings of the traction motor for vehicles. The temporary support member when the temporary support of the rotor shaft is released is attached by screwing with a temporary support bolt penetrating the inner diameter side frame portion, and is also attached.
When temporarily supporting the rotor shaft, the temporary support bolt is screwed into the temporary support screw hole penetrating the inner diameter side frame portion, and the temporary support member is partitioned by the tip of the temporary support bolt. The method for replacing a bearing of a traction motor for a vehicle according to claim 1, wherein the bolt is pushed and moved toward a member. A first supported surface having an inner peripheral surface shape along the axis of the rotor shaft is formed on the outer periphery of the inner diameter side frame portion.
The temporary support member is formed with a first support surface having an outer peripheral surface shape along the axis of the rotor shaft.
According to claim 1 or 2, the first support surface comes into surface contact with the first supported surface, so that the inner diameter side frame portion temporarily supports the rotor shaft via the temporary support member. The described method for replacing a bearing of a traction motor for a vehicle. A band ring-shaped second supported surface is formed on the outer periphery of the inner diameter side frame portion so as to be continuous with the first supported surface and orthogonal to the axis of the rotor shaft.
The temporary support member is formed with a band ring-shaped second support surface that is continuous with the first support surface and orthogonal to the axis of the rotor shaft.
The first support surface is in surface contact with the first supported surface, and the second support surface is in surface contact with the second supported surface, so that the inner diameter side frame portion is in surface contact with the temporary support member. The method for replacing a bearing of a traction motor for a vehicle according to claim 3, wherein the rotor shaft is temporarily supported. Claim 1 is characterized in that the temporary support member is supported by a slide portion formed between the inner diameter side frame portion and a holding surface facing the partition member and slides along the axis of the rotor shaft. The method for replacing a bearing of a traction motor for a vehicle according to any one of 4 to 4. The slide portion is formed on one of the temporary support member and the holding surface and extends along the axis of the rotor shaft, and the temporary support member and the holding surface are formed on the other side of the temporary support member and the holding surface. The method for replacing a bearing of a traction motor for a vehicle according to claim 5, further comprising a dovetail hole that engages with a tenon. With a cylindrical cover,
A stator core fixed to the inner peripheral wall of the cover, and
A rotor core arranged inside the stator core and fixed to the rotor shaft,
A pair of frames connected to both ends in the axial direction of the cover and accommodating the stator core and the rotor core,
A pair of bearings that are detachably attached to the inner diameter side frame portion of the tubular shape formed on the inner diameter side of the pair of frames and rotatably support the rotor shaft.
A pair of partitioning members fixed to the rotor shaft at both ends in the axial direction of the rotor core and partitioning between the pair of frames, the stator core, and the rotor core.
A temporary support member that is detachably attached to the inner diameter side frame portion and
A traction motor for vehicles characterized by being equipped with. The vehicle according to claim 7, wherein the temporary support member is engaged between the partition member and the inner diameter side frame portion so that the inner diameter side frame portion temporarily supports the rotor shaft. Traction motor. The temporary support member is screwed with a temporary support bolt penetrating the inner diameter side frame portion, and is also screwed.
The temporary support bolt is screwed into the temporary support screw hole formed through the inner diameter side frame portion, and the temporary support member is pushed and moved toward the partition member by the tip of the temporary support bolt. The vehicle traction motor according to claim 7, wherein the temporary support member is engaged with the partition member. A first supported surface having an inner peripheral surface shape along the axis of the rotor shaft is formed on the outer periphery of the inner diameter side frame portion.
The temporary support member is formed with a first support surface having an outer peripheral surface shape along the axis of the rotor shaft.
Claims 7 to 9, wherein the first support surface comes into surface contact with the first supported surface, so that the inner diameter side frame portion temporarily supports the rotor shaft via the temporary support member. The vehicle traction motor according to any one of the following items. A band ring-shaped second supported surface is formed on the outer periphery of the inner diameter side frame portion so as to be continuous with the first supported surface and orthogonal to the axis of the rotor shaft.
The temporary support member is formed with a band ring-shaped second support surface that is continuous with the first support surface and orthogonal to the axis of the rotor shaft.
The first support surface is in surface contact with the first supported surface, and the second support surface is in surface contact with the second supported surface, so that the inner diameter side frame portion is in surface contact with the temporary support member. The vehicle traction motor according to claim 10, wherein the rotor shaft is temporarily supported. 7. The provisional support member is supported by a slide portion formed between the inner diameter side frame portion and a holding surface facing the partition member, and slides along the axis of the rotor shaft. The vehicle traction motor according to any one of items 10 to 10. The slide portion is formed on one of the temporary support member and the holding surface and extends along the axis of the rotor shaft, and the temporary support member and the holding surface are formed on the other side of the temporary support member and the holding surface. 12. The traction motor for a vehicle according to claim 12, wherein the main electric motor is composed of a dovetail hole that engages with a mortise and tenon.

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