JPH1037966A - Fitting structure for resin insulated rolling bearing and its bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out certain fastening by receiving the lateral fastening force of a bearing due to a housing upon the whole of a resin covered lateral face. SOLUTION: A resin insulated rolling bearing 1 provided with an electric insulating resin coating 6 to cover the outside diametral face and lateral face of an outer ring 2 is set in a housing 9. In this case, a ring-shaped plate 16 which comes into contact with the about whole face of a part 6a to cover the lateral face of the outer ring having the resin coating 6 is provided, and a bearing outer ring 3 is laterally fastened through the plate 16 by the main body 9A of the housing 9 and a cover body 9B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of a resin insulated rolling bearing used in a place where a potential difference occurs between a bearing housing and a shaft, for example, a motor for a railway vehicle, and the bearing. .

[0002]

2. Description of the Related Art Conventionally, as a resin-insulated rolling bearing, FIG.
As shown in FIG. 3, there is a case where the outer diameter surface of an outer ring 51 is covered with a resin coating 52 such as PPS resin. The bearing 50 is often used in a form as shown in FIG. That is, the bearing 50 is disposed on the inner diameter surface of the main body 53A of the housing 53, and the width surface of the bearing 50 is tightened between the step surface 53a of the housing 53 and the lid 54. The lid 54 is fastened and fixed to the housing main body 53A with bolts (not shown).
In the housing body 53A and the lid 54, recesses 53b corresponding to the space between the inner ring 55 and the outer ring 51 of the bearing 50,
54b are provided. In the case of the grease lubrication method, as shown in FIG.
A grease replenishing groove 57 having a certain width is provided in communication with the concave portion 53b, and a grease replenishing hole 58 communicating from the outer diameter surface is provided in this groove 57.

[0003]

However, since the grease supply groove 57 is provided in the housing 53 as described above,
When the groove 57 is pressed against the resin coating 52 of the bearing 50, the deformation of the portion of the resin coating 52 covering the bearing width surface may be uneven and large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and a mounting structure of a resin-insulated rolling bearing capable of receiving a tightening force in a width direction of a bearing by a housing over an entire width surface of a resin coating and achieving secure tightening. The purpose is to provide. Another object of the present invention is to provide a mounting structure for a resin-insulated rolling bearing and a bearing that can be easily assembled while enabling the above-mentioned secure tightening.

[0005]

SUMMARY OF THE INVENTION The present invention provides a structure in which a resin-insulated rolling bearing provided with an electrically-insulating resin coating that covers an outer diameter surface and a width surface of an outer ring is provided in a housing.
A ring-shaped plate is provided in contact with substantially the entire surface of the resin-coated outer ring width surface, and the bearing outer ring is sandwiched in the width direction by the housing via the plate. By providing the plate in this manner, a force for tightening the bearing in the width direction with the housing can be received over substantially the entire surface of the resin-coated bearing width surface. Therefore, stable tightening can be performed, and secure tightening can be achieved. The housing may be provided with a grease supply groove on a step surface in contact with a width surface of the bearing outer ring and an inner diameter surface into which the bearing outer ring is fitted. In the case where such a grease reinforcing groove is provided, generally, the resin coating tends to be non-uniformly deformed. However, even in this case, the provision of the plate ensures stable fastening. In the above configuration, the ring-shaped plate may be attached to the resin coating by integral molding. By assembling the plate in advance with the resin coating to form a bearing with a plate, it is possible to avoid an increase in the number of parts of the equipment using the bearing, and to make the work of interposing the plate at the time of assembling and complicated storage of parts. I can prevent it.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. First, the outline will be briefly described. The mounting structure of the resin-insulated rolling bearing is a structure in which the resin-insulated rolling bearing 1 in which the resin coating 6 is provided on the outer ring 3 is installed in the housing 9. A ring-shaped plate 16 is provided in contact with the covering portion 6a.
6, the bearing outer ring 3 is sandwiched between the housings 9 in the width direction.

The bearing 1 comprises a cylindrical roller bearing, and a cylindrical rolling element 5 held by a retainer 4 is interposed between an inner ring 2 having no flange and an outer ring 3 having both flanges. The outer ring 3 is covered with an electrically insulating resin coating 6 from the outer diameter surface to the width surfaces on both sides. Portion 6a covering outer ring width surface of resin coating 6
Is provided at a position substantially the same as the position corresponding to the raceway surface 3a of the outer race 3, or extending slightly inward from the position. The resin coating 6 is integrally molded with the outer ring 3 by injection molding or the like, and circumferential grooves 7, 8 for strengthening the fixing of the resin coating 6 are formed on the outer diameter surface and the width surface of the outer ring 3.
Is formed. The resin coating 6 is molded to the inside of the grooves 7 and 8. The width of the outer race 3 in the axial direction is the same as the width of the inner race 2 including the resin coating 6. Explaining a material example, the inner and outer rings 2 and 3 and the rolling elements 5 are made of a conductive material such as bearing steel. For the resin coating 6, a polyphenylene sulfide resin (PPS resin), nylon 66, nylon 44, urethane resin, acrylic resin, epoxy resin, or the like is used.

The housing 9 comprises a housing body 9A and a ring-shaped lid 9B. Housing body 9A
Has a cylindrical surface portion 9a for fitting the outer ring 3 of the bearing 1 and a step surface 9b for abutting the width surface of the bearing outer ring 3;
The cover 9B opposed to the housing body 9A is
At 0, it is tightened and fixed in the axial direction. Housing body 9
The cylindrical surface portion 9a of A is formed to be slightly longer than the width of the bearing 1, and the lid 9B has a circular protrusion 9Aa protruding from the inner surface.
Is fitted to the cylindrical surface portion 9a of the housing body 9A, and is fixed by the bolt 10 on the outer diameter side from the fitted portion. The housing body 9 </ b> A and the lid 9 </ b> B have annular recesses 11 facing the space between the inner ring 2 and the outer ring 3 of the bearing 1.
The recesses 11 and 12 are used for grease accumulation or the like. In order to secure the amount of grease or the like, the inner surfaces of the recesses 11 and 12 on the outer diameter side are fixed to the raceway surface 3a of the outer race 3
It is expanded to a position that is slightly larger than the diameter. Also,
Grease supply grooves 13 and 14 are formed in the housing 9A so as to be continuous with the cylindrical surface portion 9a and the step surface 9b.
The grease supply groove 14 is opened in the recess 11 and
A grease supply hole 15 is provided in the grease supply groove 13 of the cylindrical surface portion 9a so as to communicate from outside the housing.

Plates 16 provided on both sides of the width of outer ring 3
Is formed of a ring-shaped metal plate or the like, and has an inner diameter and an outer diameter that cover substantially the entire surface of the portion 6a that covers the outer ring width surface of the resin coating 6. In this example, the outer diameter of the plate 16 is substantially equal to the outer diameter of the bearing outer ring 3 including the resin coating 6, and the inner diameter is the same as or slightly smaller than the inner diameter edge of the width surface covering portion 6 a of the resin coating 6. is there. Plate 16 is
It may be prepared as a single part and installed at the time of assembling the bearing 1 into the housing 9, or the plate 16 may be previously combined with the resin coating 6 by integral molding, that is, by insert molding.

In the resin-insulated rolling bearing 1 having the above structure, even if a potential difference occurs between a shaft (not shown) on which the inner race 2 is mounted and the housing 9, the inner and outer races 2 are electrically insulating by the resin coating 6. , 3 is prevented from flowing, and electrolytic corrosion on the track surface and the like is prevented. The lubrication of the bearing 1 is performed through the grease supply hole 15 and the grease supply grooves 13 and 14 and the recess 1.
This is performed by grease supplied into the bearing 1 via the first and second gears 12. The bearing 1 is fixed by tightening the outer ring 3 in the width direction between the housing body 9A and the lid 9B. In this case, even if the grease supply groove 14 is formed on the step surface 9b of the housing body 9A, the plate 16
, The tightening force of the bolt 10 can be received over the entire surface 6a of the resin coating 6. As in this example, the housing body 9A and the lid 9B are formed with recesses 11 and 12 that serve as grease reservoirs, and these housing body 9A and the lid 9B are formed.
Can not be in contact with the entire surface of the width-covered portion 6a of the resin coating 6, but the clamping force can be received on the entire surface of the width-covered portion 6a by the interposition of the plate 16. Therefore, the tightening is stable, and the tightening can be reliably performed. In addition, initial material creep can be prevented, and loosening of the bolt 10 can be prevented.

FIG. 2 shows another embodiment of the present invention. The bearing 1 of this embodiment is formed of a ball bearing, and has an electrically insulating resin coating 6 covering the outer diameter surface and the width surface of the outer ring 3 as in the example of FIG.
And a portion 6 covering the outer ring width surface of the resin coating 6.
A ring-shaped plate 16 is provided in contact with substantially the entire surface of a, and the bearing outer ring 3 is sandwiched between the housing body 9A of the housing 9 and the lid 9B in the width direction via the plate 16. The configurations of the housing 9 and the plate 16 are the same as in the example of FIG. In the case of this configuration, each effect similar to that of the above embodiment can be obtained.

FIG. 3 is a schematic sectional view of a motor for a railway vehicle to which the mounting structure of the resin insulated rolling bearing is applied. A motor shaft 33 is rotatably supported via bearings 31 and 32 provided on the motor casing 30.
A field 34 and an armature 35 are provided on the inner surface of the motor 0 and the motor shaft 33, and a commutator 36 is provided alongside the armature 35. The front bearing 31 of the motor comprises a ball bearing, and the rear bearing 32 comprises a roller bearing. The front and rear bearings 31 and 32 employ the resin-insulated rolling bearing 1 of FIGS. 2 and 1 and a mounting structure thereof. In this case, a part of the motor casing 30 becomes the housing 9.

[0013]

According to the mounting structure of the resin-insulated rolling bearing of the present invention, a ring-shaped plate is provided which is in contact with substantially the entire surface of the resin-coated outer ring width surface. Since the housing is sandwiched, the tightening force of the housing in the width direction of the bearing can be received over the entire width surface of the resin coating, and secure tightening can be performed.
Even when the grease supply groove is provided on the step surface in contact with the width surface of the bearing outer ring of the housing and on the inner diameter surface into which the bearing outer ring is fitted, the tightening by the plate can be ensured. When the plate is integrally formed with the resin coating, it is possible to easily assemble the equipment using the bearing and to store the parts easily.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of one embodiment of the present invention.

FIG. 2 is a partial sectional view of another embodiment of the present invention.

FIG. 3 is a schematic partial sectional view of a railway vehicle motor to which the bearing mounting structure according to these embodiments is applied.

FIG. 4 is a sectional view of a conventional resin-insulated rolling bearing.

FIG. 5 is a cutaway perspective view of the mounting structure of the conventional bearing.

[Description of Signs] 1 ... Bearing 9 ... Housing 2 ... Inner ring 9A ... Housing main body 3 ... Outer ring 9B ... Lid 6 ... Resin coating 13,14 ... Grease supply groove 6a ... Width surface covering portion 16 ... Plate

Claims (4)

[Claims] 1. A structure in which a resin-insulated rolling bearing provided with an electrically insulating resin coating that covers an outer diameter surface and a width surface of an outer ring is installed in a housing, and substantially the entire surface of the resin coating that covers the outer ring width surface. A mounting structure for a resin-insulated rolling bearing in which a ring-shaped plate is provided so as to be in contact with the outer ring of the bearing and the housing is sandwiched in the width direction by the plate. 2. The mounting structure for a resin-insulated rolling bearing according to claim 1, wherein said plate is formed integrally with said resin coating. 3. The mounting of the resin-insulated rolling bearing according to claim 1, wherein a grease replenishing groove is provided on a step surface in contact with the width surface of the bearing outer ring of the housing and an inner diameter surface into which the bearing outer ring is fitted. Construction. 4. A resin-insulated rolling bearing provided with an electrically insulating resin coating covering an outer diameter surface and a width surface of an outer ring, wherein a ring-shaped plate contacting substantially the entire surface of the resin coating covering the outer ring width surface is provided. And a resin-insulated rolling bearing provided integrally with the resin coating.