KR100950429B1 - An electric insulator device for bearing - Google Patents

Abstract

PURPOSE: An electric insulator device for a bearing is provided to satisfy various electric insulation requirements because the exterior surface is formed out of a metal material. CONSTITUTION: An electric insulator device for a bearing comprises plural metal layers(110), an insulating layer(120), and plural bearings. The insulating layer is formed out of a glass material between the metal layers. The bearings revolve along a rolling surface formed on the external side of the metal layers. The insulating layer includes an outer race which is positioned to surround the bearings. The metal layers and the insulating layer have a ring shape.

Description

An electric insulator device for bearing}

The present invention relates to a bearing electrical insulation device insulated with glass, and more particularly, to a bearing electrical insulation device including a plurality of metal layers made of metal-based materials and an insulating layer made of glass-based material between the metal layers. .

TECHNICAL FIELD The present invention relates to a bearing electrical insulation device for use in a device in which a current may flow into a bearing, such as a general-purpose motor, a generator for a generator, a main motor of a railway vehicle, and the like. BACKGROUND ART Conventionally, as an anti-corrosion bearing, one produced by thermal spraying processing or a resin resin layer of plastic resin series is generally manufactured. The anti-corrosion bearings formed by thermal spraying and resin coating are made of ceramic (metal oxide) or resin-coated insulating layer on the outer circumference and width of the raceway. The structure in which the insulating layer is formed requires complicated work to manage the film thickness, requires a considerable time for measurement, and circumferential machining is very difficult. In addition, processing also requires considerable time and effort. The above works contributed to the increase in the production cost of bearings.

In particular, ceramics (metal oxides) are brittle, so they can be broken during the assembly process between bearings and bearing housings, during operation of electrical equipment, or external shocks. Moisture penetrated into the insulation to reduce the electrical insulation performance. In addition, it is very difficult to increase the thickness of the insulating layer in order to increase the insulation performance of the ceramic (metal oxide) insulating coating, and as the coating surface is wider, the deformation difference with the bearing material is severe, so that the coating joint surface can be easily dropped.

Bearings insulated with resin-based resin coatings are vulnerable to mechanical deformation and have very low thermal conductivity, which prevents heat release from the bearings, which leads to an increase in bearing temperature, which reduces the life of the bearing itself and at the same time induces thermal deformation. It was. This causes shaft misalignment and provides a cause of bearing breakage.

In the case of general journal bearings (metal bearings) or journal bearings with self-aligning function, like general-purpose bearings, they are electrically insulated by resin coating. In particular, the resin coated surface of the journal bearing with the self-aligning function forms an electrical insulating layer with a spherical bearing shell, a contact surface with the bearing housing, or a resin mixture coating for enhancing mechanical strength. One side of the insulator is joined to one of the bearing shells or bearing housings, so the other part slides into the insulator. The resin coated insulation layer of the journal bearing and the water surface in contact with the bearing shell must have an even spherical shape for automatic self-care function. It will degrade performance. This causes shaft axial deviation and vibration, which leads to breakage of bearings and rotors.

Consisting of the bearing electrical insulation device made of metal oxide is expensive, it is not suitable for general small motors, it is not easy to machine the surface, and it is cracked due to brittleness and cracking due to difference in thermal expansion coefficient between the inner and outer rings Easy to get up Resin-bearing bearing insulation prevents heat dissipation from bearings and is weak to temperature and mechanical loads.

The present invention is to solve the above problems, replacing the conventional bearing insulation material is easy to process irrespective of the type and size of the bearing, bearing bearing having a high thermal conductivity while being resistant to compressive deformation heat deformation load It is an object to provide an insulation device.

As a technical idea for achieving the above object, the present invention provides a bearing electrical insulation device insulated with glass, comprising: a plurality of metal layers made of a metal-based material; Including an insulating layer made of a glass-based material between the metal layer, wherein the metal-based material and the glass-based material is a bearing electrical insulation device, characterized in that the thermal expansion coefficient is the same.

The metal layer and the insulation layer form a ring shape, and the bearing electrical insulation device further includes a ring bearing located inside or outside the metal layer.

In addition, the metal layer and the insulating layer forms a ring shape, the bearing electrical insulation device, a plurality of bearing motor rotating along the rolling surface formed on the outer surface of the metal layer; It may further include a ring-shaped bearing outer ring located on the outer side of the bearing transmission body surrounding the plurality of bearing transmission body.

In addition, the metal layer and the insulating layer forms a ring-shaped shape, the bearing electrical insulation device, a plurality of bearing motor rotating along the rolling surface formed on the inner surface of the metal layer; It may further include a ring inner bearing located inside the bearing motor body surrounding the plurality of bearing motor bodies.

In addition, the metal layer and the insulating layer is formed in the shape of a disk, the bearing electrical insulation device, a plurality of bearing motor rotating along the cloud surface formed on the lower surface of the metal layer; It may further include a lower track wheel of the disk form located on the lower side of the bearing transmission body surrounding the plurality of bearing transmission body.

The metal layer and the insulating layer form a disk-like shape, and the bearing electrical insulation device includes: a plurality of bearing motors rotating along a cloud surface formed on the upper surface of the metal layer; It may further include a disk-shaped upper track wheel located on the bearing motor body surrounding the plurality of bearing motor body.

The outer surfaces of the metal layer are preferably formed by quenching cutting or polishing.

The said insulating layer is a form which insulated the circumferential direction and the axial direction of the said bearing.

The bearing carries axial forces.

The glass-based material is preferably glass.

The bearing includes a bearing inner ring having a rolling surface on which an outer rolling element can be rolled and guiding rotation of the bearing moving body; A bearing outer ring having a rolling surface on which an inner rolling element can be rolled and guiding rotation of the rolling element; A plurality of bearing motors rotating along the rolling surface formed on the bearing inner ring and the bearing outer ring; And a retainer that supports rotation of the bearing motor and couples the plurality of bearing motors.

It is preferable that the said bearing transmission body is a ball bearing, a roller bearing, a tapered roller bearing, and a journal bearing.

The present invention is a bearing electrical insulation device is easy to machine because the surface contacting the outside is a metal-based material rather than a conventional metal oxide or plastic-based, it is easy to control the thickness of the insulating layer by adjusting the thickness of the metal material There is an effect that can satisfy various electrical insulation performance.

In addition, it is easy to reduce the thickness of the insulating layer has an effect that can easily improve the mechanical strength. The glass material used in the insulating layer has a higher compressive and tensile strength than the conventional bearing insulating material, and because the glass material uses a glass material similar to that of a metal material, thermal stress due to heat transmitted from the bearing and the rotating body is reduced. Compared with the conventional insulator, it is relatively small and has a strong effect on insulator breakage.

In addition, the glass material used in the present invention is stronger than the conventional bearing insulation material in thermal deformation and heat damage because it withstands the temperature higher than the operating temperature range of the bearing operating and the rotating body. Therefore, the present invention can simplify the bearing insulation method and improve the electrical insulation performance, thermal performance, and mechanical performance of the bearing anticorrosion material.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the embodiment of the present invention.

The bearing electrical insulation device is a component material to prevent the electrical corrosion of the bearing. The rolling elements and loads such as the circumferential surface and the width surface of the inner and outer rings of the bearing and the circumferential surface and the width surface of the bearing housing form a closed circuit to prevent the possibility of electric corrosion by the axial current. The intermediate part of the provided metal material is separated and the surfaces between the metal parts are melt-bonded with each other by glass material to electrically separate the two metal materials. Bearing electrical insulators can be used as the inner and outer rings of bearings or as intermediate materials for bearing housings. It can also be used as a separate part from bearings and bearing housings. The bearing electrical insulation device may be provided with a glass material and a conventional bearing material surrounding the glass material among standard dimensions of various standards.

1 is a conceptual diagram illustrating a basic concept of a bearing electrical insulation device. The concept of a representative type of bearing electrical insulation device is explained using FIG. 2 is a perspective view showing an embodiment of circumferential glass insulation. 3 is a cross-sectional view showing an embodiment of glass insulation in the circumferential direction. In general, the bearing electrical insulation device is formed by melting and bonding the metal layers 110 made of a metal material and the insulating layer 120 made of a glass material between the metal layers 110.

The bearing electrical insulation device may be used as a material (generally a bearing outer ring) for fixing a bearing or a material (generally a bearing inner ring) for fixing a rotating shaft. In addition, the bearing electrical insulation device is used as a separate part from the bearing is coupled to the inside and the outside of the bearing, when coupled to the outside of the bearing is used as assembled with the bearing housing, when combined with the inside of the bearing is assembled together with the shaft It is used. The glass material forming the insulating layer 120 is controlled by the gap between the metal layers 110 according to the insulating performance and mechanical strength. The exposed surface of the metal layer 110 may be processed in various ways according to the use or convenience of assembly. In the above embodiment, the insulating layer 120 is a single layer, but a plurality of layers may be formed. The outer surfaces of the metal layer are formed by quenching cutting or polishing.

Hereinafter, embodiments of the circumferential glass insulation of the bearing electrical insulation device will be described with reference to FIGS. 4, 5, 6, and 7. Fig. 4 is a sectional view showing the first embodiment in which the bearing electrical insulation device is coupled to the outside of the bearing. Fig. 5 is a sectional view showing the second embodiment in which the bearing electrical insulation device is coupled inside the bearing. FIG. 6 is a sectional view showing a third embodiment in which the bearing electrical insulation device 100 is used as the bearing inner ring 210. As shown in FIG. FIG. 7 is a sectional view showing the fourth embodiment in which the bearing electrical insulation device 100 is used as the bearing outer ring 220. As shown in FIG.

The first and second embodiments are embodiments used as components separate from the bearing 200. When the bearing electrical insulation device 100 is fitted to the outside of the bearing 200, the bearing electrical insulation device 100 is inserted into a ring shape between the bearing outer ring 220 and the bearing housing. 4 corresponds to this.

When the bearing electrical insulation device 100 is inserted into the bearing 200, the bearing electrical insulation device 100 is inserted between the bearing inner ring 210 and the rotating shaft 300 in a ring shape. 5 corresponds to this.

In each drawing, (a) is an embodiment using a ball bearing as a bearing transmission body, (b) is an embodiment using a roller bearing as a bearing transmission body, and (c) is an embodiment using a tapered roller bearing as a bearing transmission body. Yes. Each bearing motor is connected by a retainer 260 which guides rotation as each rolling element rotates. The same is true in the drawings used below.

Next, a third embodiment in which the bearing electrical insulation device 100 is used as the bearing inner ring 210 and a fourth embodiment in which the bearing electrical insulation device 100 is used as the bearing outer ring 220 will be described. First, the third embodiment will be described. In general, the shape of the exposed surface of the metal layer 110 of the bearing electrical insulation device 100 is a surface that is variously processed according to the purpose. When the bearing electrical insulation device 100 is used as the bearing inner ring 210, the inner surface 110a becomes a surface in contact with the rotating shaft, and the outer surface 110b is a surface processed to be rolled by the bearing motor, and the journal bearing In this case, it may be a part where sliding friction occurs. There is a ring-shaped bearing outer ring 220 which surrounds the bearing motor body so that the bearing motor body can reach and roll.

The fourth embodiment will be described below. When the bearing electrical insulation device 100 is used as the bearing outer ring 220, the outer surface 110b becomes a surface in contact with the bearing housing and the inner surface 110a is a surface processed so that the bearing motor can be rolled. The bearing transmission body generally uses the ball bearing 251, the roller bearing 252, and the tapered roller bearing 253, but is applicable to all general general-purpose bearings. There is a ring inner bearing 210 that surrounds the bearing motor body so that the bearing motor body can reach and roll. In the case of a journal bearing, it is preferable to place a ring-shaped ring between the bearing outer ring and the inner ring of the bearing instead of the ball bearing, the roller bearing, and the tapered roller bearing so as to reduce friction by using oil.

Next, embodiments of the axial glass insulation of the bearing electrical insulation device 100 will be described with reference to FIGS. 8, 9, 10, and 11. 8 is a perspective view and a cross-sectional view showing an embodiment of the glass insulation form in the rotation axis direction. FIG. 9 is a cross-sectional view showing a fifth embodiment in which the bearing electrical insulation device 100 serves as an upper track wheel of a bearing in which an axial force is applied. Although not shown in the drawings, it is also possible for the bearing electrical insulation device 100 to serve as a lower track wheel of a bearing that is axially forced. 10 is a cross-sectional view showing a sixth embodiment in which the bearing electrical insulation device 100 is coupled to the outside of the bearing 200 to exert a force on the bearing 100 in the rotational axis direction. FIG. 11 is a cross-sectional view illustrating a seventh embodiment in which the bearing electrical insulation device 100 is coupled to the inside of the bearing 200 so that a force acts on the bearing in the direction of the rotation axis. The sixth and seventh embodiments correspond to a form generally used for heavy electric (motor).

The fifth embodiment will be described below. The fifth embodiment is an embodiment in which the bearing electrical insulation device 100 is used as a component material of the bearing 100. In general, the shape of the exposed surface of the metal layer 110 of the bearing electrical insulation device is a surface that is variously processed according to the purpose. When the bearing electrical insulation device 100 is used as the upper orbital wheel 230 of the bearing 200, the upper surface 110c becomes a surface in contact with the rotating shaft, and the lower surface 110d is processed so that the bearing motor can be rolled to reach. Surface, and in the case of journal bearings, it becomes a part where sliding friction occurs. And there is a ring-shaped lower orbital wheel 240 surrounding the bearing motor body on the upper surface so that the bearing motor body can reach and roll.

Although not shown in the drawings, it is also possible for the bearing electrical insulation device 100 to be used as the lower orbital wheel 240 of the bearing 200 which is forced in the axial direction. In this case, the bearing electrical insulation device 100 is positioned below to serve as a lower track wheel, and a ring-shaped upper track wheel surrounding the bearing motor body at the bottom so that the bearing motor can be rolled on the lower track wheel. There is this.

The sixth embodiment will be described below. FIG. 10 related to the sixth embodiment shows a form in which both the circumferential direction and the axial direction of the bearing are insulated from the melt-bonded glass material. When the bearing electrical insulation device is coupled to the outside of the bearing 200 to use a force applied to the bearing in the direction of the rotation axis, the outer surface 110b becomes a surface in contact with the bearing housing and the inner surface 110a is the outer surface of the bearing outer ring 220. It comes in contact with.

The seventh embodiment will be described below. FIG. 11 related to the seventh embodiment shows a form in which both the circumferential direction and the axial direction of the bearing are insulated from the melt-bonded glass material. When the bearing electrical insulation device 100 is coupled to the inside of the bearing 200 to be used to apply a force to the bearing in the rotational axis direction, the inner surface 110a becomes a surface in contact with the inner surface of the bearing inner ring 210 and the outer surface 110b. Is a surface in contact with the rotating shaft (300).

The bearing motor used in the above-described embodiment is an embodiment using the ball bearing 251, roller bearing 252, tapered roller bearing 253, but is applicable to all general general-purpose bearings.

Preferably, the bearing 200 described above has a rolling surface on which an outer rolling element can be rolled and has a rolling surface that guides the rotation of the bearing transmission body. A bearing outer ring 220 having a rolling surface and guiding rotation of the bearing transmission body, a plurality of bearing motors rotating along a rolling surface formed on the bearing inner ring 210 and the bearing outer ring 220, and the bearing driving body. It consists of a retainer 260 to support the rotation of the coupling of the plurality of the bearing motors.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may be embodied in other specific forms without changing the technical spirit or essential features of the present invention. You will understand that. Accordingly, the embodiments described above are exemplary in all respects and not restrictive.

1 is a conceptual diagram illustrating a basic concept of a bearing electrical insulation device.

2 is a perspective view showing an embodiment of circumferential glass insulation.

3 is a cross-sectional view taken along the line A-A in FIG. 2 showing an embodiment of circumferential glass insulation.

4 is a cross-sectional view showing the first embodiment of the present invention in which the bearing electrical insulation device is coupled to the outside of the bearing.

Fig. 5 is a sectional view showing a second embodiment of the present invention in which a bearing electrical insulation device is coupled inside a bearing.

Fig. 6 is a sectional view showing the third embodiment of the present invention in which the bearing electrical insulation device is used as the bearing inner ring.

Fig. 7 is a sectional view showing the fourth embodiment of the present invention in which the bearing electrical insulation device is used as the bearing outer ring.

8 is a perspective view and a cross-sectional view showing an embodiment of the glass insulation form in the rotation axis direction.

FIG. 9 is a cross-sectional view showing the fifth embodiment of the present invention in which the bearing electrical insulation device is used as the upper track wheel of a bearing which is axially forced.

FIG. 10 is a sectional view showing a sixth embodiment of the present invention in which a bearing electrical insulation device is coupled to the outside of a bearing and a force is applied to the bearing in the direction of the rotation axis.

FIG. 11 is a cross-sectional view showing a seventh embodiment of the present invention in which a bearing electrical insulation device is coupled to an inside of a bearing so that a force acts on the bearing in a rotational axis direction.

<Description of Major Symbols in Drawing>

100: bearing electrical insulation device

110: metal layer

120: insulation layer

200: bearing

210: bearing inner ring

220: bearing outer ring

230: upper track wheel

240: lower track wheel

251: Ball Bearing

252: Roller Bearing

253: Tapered Roller Bearing

260: Retainer

Claims (13)

delete delete In glass insulated bearing electrical insulator, A plurality of metal layers made of metal-based materials; An insulating layer made of a glass-based material between the metal layers; A plurality of bearing motors rotating along the rolling surface formed on the outer surface of the metal layer; And A bearing outer ring in a ring shape located outside the bearing motor body and surrounding the plurality of bearing motor bodies; And the metal layer and the insulating layer form a ring-shaped shape. In glass insulated bearing electrical insulator, A plurality of metal layers made of metal-based materials; An insulating layer made of a glass-based material between the metal layers; A plurality of bearing motors rotating along the rolling surface formed on the inner surface of the metal layer; And A bearing inner ring in a ring shape located inside the bearing motor body and surrounding the plurality of bearing motor bodies; And the metal layer and the insulating layer form a ring-shaped shape. In glass insulated bearing electrical insulator, A plurality of metal layers made of metal-based materials; An insulating layer made of a glass-based material between the metal layers; A plurality of bearing motors rotating along the rolling surface formed on the lower surface of the metal layer; And And a disk-shaped lower raceway wheel positioned below the bearing motor body and surrounding the plurality of bearing motor bodies. And the metal layer and the insulating layer form a disk-shaped shape. In glass insulated bearing electrical insulator, A plurality of metal layers made of metal-based materials; An insulating layer made of a glass-based material between the metal layers; A plurality of bearing motors rotating along the rolling surface formed on the upper surface of the metal layer; And An upper track wheel in the form of a disk positioned above the bearing motor body and surrounding the plurality of bearing motor bodies; And the metal layer and the insulating layer form a disk-shaped shape. delete delete delete delete delete The method according to any one of claims 3 to 6, The bearing motor is, And said ball bearing, roller bearing, tapered roller bearing, and journal bearing. delete

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