Insulating bearing and insulating bearing assembly

Abstract

The present application relates to an insulating bearing and an insulating bearing assembly. The insulating bearing comprises an outer ring, an inner ring, rolling bodies, and a cage. The outer ring comprises a main body portion and a step portion. The step portion is located at the axial end of the main body portion. The outer periphery of the step portion is recessed radially inward relative to the outer periphery of the main body portion. The outer periphery of the main body portion, the outer periphery of the step portion, and a connection surface connecting the two portions are provided with an insulating layer. The step portion is used for mounting an O-shaped ring. By using the insulating bearing and the insulating bearing assembly of the present application, the O-shaped ring can be mounted on the step portion to increase friction, thereby preventing outer ring creep, without affecting demolding during injection molding.

Description

Insulated bearing and insulated bearing assembly TECHNICAL FIELD

[0001] The present application relates to the technical field of insulated bearings. More particularly, the present application relates to an insulated bearing and an insulated bearing assembly. BACKGROUND

[0002] If installed in an environment with current, the bearing is prone to electrochemical corrosion failure, so the bearing needs to have insulation function. As shown in FIG. 1, in the related art, an insulation layer 50 is made on the outer ring 10 to prevent current from passing through the bearing, thereby avoiding electrochemical corrosion failure of the outer ring 10, the inner ring 20, the retainer 40 and the rolling element 30 after the accumulation of electrons, so as to avoid electrochemical corrosion failure. Insulated bearings are often used in motor floating ends, and the outer ring 10 and the bearing seat are gap-fitted. The outer ring 10 is prone to run-out during operation of the insulated bearing. Due to the limitation of related design and injection molding process, the insulated bearing cannot increase a U-shaped groove on the outer ring 10, and a friction piece cannot be increased in the U-shaped groove to avoid run-out of the outer ring. SUMMARY

[0003] The purpose of the present application is to provide an insulated bearing and an insulated bearing assembly, which can increase friction by installing an O-ring on the step portion, thereby avoiding run-out of the outer ring, and not affecting injection molding demolding.

[0004] The present application provides an insulated bearing, which comprises an outer ring, an inner ring, a rolling element and a retainer, the outer ring comprising:

[0005] a main body portion; and

[0006] a step portion, the step portion being located at an axial end of the main body portion, an outer periphery of the step portion being recessed radially inward relative to an outer periphery of the main body portion, the outer periphery of the main body portion, the outer periphery of the step portion and a connecting surface connecting the two all having an insulation layer, the step portion being used for installing an O-ring.

[0007] In the embodiment of the present application, an outer surface of the insulation layer of the step portion is recessed radially inward relative to an outer surface of the insulation layer of the main body portion.

[0008] In the embodiment of the present application, the connecting surface is perpendicular to the outer periphery of the main body portion and the outer periphery of the step portion.

[0009] In the embodiment of the present application, an end of the main body portion away from the step portion has the insulation layer, and an end of the step portion away from the main body portion has the insulation layer.

[0010] The embodiment of the present application also provides an insulated bearing assembly, which comprises an O-ring and the above-mentioned insulated bearing.

[0011] In the embodiment of the present application, the O-shaped ring is located at the outer periphery of the stepped portion, and the O-shaped ring is interference-fitted with the outer periphery of the stepped portion.

[0012] In the embodiment of the present application, the outer periphery of the O-shaped ring protrudes radially outward relative to the outer periphery of the main body portion.

[0013] In the embodiment of the present application, the insulating bearing assembly further comprises a bearing seat, the outer periphery of the main body portion is fitted with the inner periphery of the bearing seat, and the outer periphery of the stepped portion and the inner periphery of the bearing seat have a receiving space therebetween, and the O-shaped ring is located in the receiving space.

[0014] In the embodiment of the present application, the O-shaped ring is interference-fitted with the inner periphery of the bearing seat.

[0015] In the insulating bearing and the insulating bearing assembly of the present application, the outer ring of the insulating bearing comprises a main body portion and a stepped portion. The outer periphery of the main body portion, the outer periphery of the stepped portion, and the connecting surface connecting the two all have insulating layers to prevent current from passing through the bearing, thereby avoiding electrical corrosion failure. The outer periphery of the stepped portion is recessed radially inward relative to the outer periphery of the main body portion, and the recessed stepped portion can provide installation space for the O-shaped ring. The O-shaped ring is squeezed between the bearing seat and the stepped portion, which improves the friction between the outer ring and the bearing seat and avoids the outer ring from running out of place. In the process of axial floating of the insulating bearing, the O-shaped ring can roll axially, changing sliding friction into rolling friction to avoid friction noise. At the same time, the stepped portion is located at the axial end of the main body portion, which facilitates processing and does not affect injection molding demolding. BRIEF DESCRIPTION OF DRAWINGS

[0016] FIG. 1 is a structural schematic diagram of an insulating bearing in the related art;

[0017] FIG. 2 is a structural schematic diagram of an insulating bearing in an embodiment of the present application;

[0018] FIG. 3 is a structural schematic diagram of an insulating bearing assembly in an embodiment of the present application. DETAILED DESCRIPTION

[0019] The specific embodiments according to the present application will be described below with reference to the accompanying drawings. The following detailed description and drawings are used to exemplarily illustrate the principles of the present application, and the present application is not limited to the preferred embodiments described, and the protection scope of the present application is defined by the claims.

[0020] As shown in FIGS. 2 and 3, the embodiment of the present application provides an insulating bearing, which comprises an outer ring 100, an inner ring 200, rolling elements 300, and a retainer 400, and the rolling elements 300 are supported by the retainer 400 between the outer ring 100 and the inner ring 200.

[0021] The outer ring 100 comprises a main body portion 110 and a stepped portion 120. The main body portion 110 and the stepped portion 120 can be an integral structure.

[0022] The outer periphery of the stepped portion 120 is recessed radially inward relative to the outer periphery of the main body portion 110, and the stepped portion 120 is used to mount the O-ring 600. That is, the space in which the outer periphery of the stepped portion 120 is recessed radially inward provides a mounting space for the O-ring 600. After the insulating bearing is mounted to the bearing seat 700, the O-ring 600 is squeezed between the bearing seat 700 and the stepped portion 120, which improves the friction between the outer ring 100 and the bearing seat 700 and prevents the outer ring 100 from running off.

[0023] The stepped portion 120 is located at the axial end of the main body portion 110 and at least one axial end. That is, the stepped portion 120 can be provided only at one end of the main body portion 110, or the stepped portion 120 can be provided at both ends of the main body portion 110. The stepped portion 120 is located at the axial end of the main body portion 110, which facilitates processing and does not affect the demolding in the injection molding process.

[0024] The outer periphery of the main body portion 110, the outer periphery of the stepped portion 120, and the connecting surface therebetween all have an insulating layer 500, which prevents current from passing through the bearing and thereby avoids electrochemical corrosion failure.

[0025] In the embodiment of the present application, the outer surface of the insulating layer 500 of the stepped portion 120 is recessed radially inward relative to the outer surface of the insulating layer 500 of the main body portion 110. The insulating layer 500 is a layer of insulating material attached to the outermost layer of the outer ring 100.

[0026] The insulating layer 500 can be considered as part of the outer ring 100.

[0027] Before the insulating layer 500 is attached, the outer periphery of the stepped portion 120 is recessed radially inward relative to the outer periphery of the main body portion 110. After the insulating layer 500 is attached, the outer surface of the insulating layer 500 of the stepped portion 120 is the outer periphery of the stepped portion 120, and the outer surface of the insulating layer 500 of the main body portion 110 is the outer periphery of the main body portion 110. Therefore, after the insulating layer 500 is attached, the outer periphery of the stepped portion 120 is also recessed radially inward relative to the outer periphery of the main body portion 110. That is, the insulating layer 500 is a layer of insulating material with uniform thickness. The provision of the insulating layer 500 does not affect the mounting space of the O-ring 600 formed by the recessing of the stepped portion 120 radially inward.

[0028] In the embodiment of the present application, the connecting surface is perpendicular to the outer periphery of the main body portion 110 and the outer periphery of the stepped portion 120. After the insulating bearing is mounted, the connecting surface is opposite the bottom of the bearing seat 700. The connecting surface and the bottom of the bearing seat 700 form a stop surface for the axial movement of the O-ring 600.

[0029] In the embodiment, the end of the main body 110 away from the step portion 120 has an insulating layer 500, and the end of the step portion 120 away from the main body 110 has an insulating layer 500. That is, the insulating layer 500 covers not only the surface of the radial outer periphery of the outer ring 100, but also at least part of the surface of the axial end of the outer ring 100, thereby forming a better insulation effect.

[0030] The embodiment also provides an insulating bearing assembly. The insulating bearing assembly comprises an O-ring 600 and the insulating bearing described above. That is, the O-ring 600 is installed on the step portion 120 of the insulating bearing to form the insulating bearing assembly. The O-ring 600 is made of rubber material, which can increase the friction between the outer ring 100 and the bearing seat 700. The cross section of the O-ring 600 is circular, and the O-ring 600 can roll axially in the process of axial floating of the insulating bearing, so as to change the sliding friction into rolling friction and avoid friction noise.

[0031] The O-ring 600 is located on the outer periphery of the step portion 120, and the O-ring 600 is in interference fit with the outer periphery of the step portion 120. The inner periphery of the O-ring 600 is sleeved on the outer periphery of the step portion 120, and the inner periphery of the O-ring 600 is in a stretched state.

[0032] The outer periphery of the O-ring 600 protrudes radially outward relative to the outer periphery of the main body 110. The protruding state is the state before the O-ring 600 is installed on the bearing seat 700, and the outward protruding part of the O-ring 600 provides a compression amount when the O-ring 600 is installed on the bearing seat 700. After the bearing assembly is installed on the bearing seat 700, the outer periphery of the O-ring 600 is in a compressed state, and the O-ring 600 is squeezed between the step portion 120 and the bearing seat 700.

[0033] As shown in FIG. 3, the embodiment also provides an insulating bearing assembly, which further comprises a bearing seat 700. The insulating bearing assembly comprises the O-ring 600, the bearing seat 700 and the insulating bearing described above. That is, the O-ring 600 is installed on the step portion 120 of the insulating bearing, and then is installed on the bearing seat 700 to form the insulating bearing assembly.

[0034] The outer periphery of the main body 110 of the insulating bearing is matched with the inner periphery of the bearing seat 700, and the outer periphery of the step portion 120 has a containing space with the inner periphery of the bearing seat 700, and the O-ring 600 is located in the containing space. The containing space is the installation space of the O-ring 600.

[0035] The O-ring 600 is in interference fit with the inner periphery of the bearing seat 700. The O-ring 600 is squeezed in the accommodating space by the outer periphery of the step portion 120 and the inner periphery of the bearing seat 700. The O-ring 600 is made of rubber material, which can increase the friction between the outer ring 100 and the bearing seat 700. The cross section of the O-ring 600 is circular, and the O-ring 600 can roll axially in the process of axial floating of the insulating bearing, so as to change the sliding friction into rolling friction, thereby avoiding friction noise.

[0036] Therefore, in the insulating bearing and the insulating bearing assembly of the present application, the outer periphery of the main body portion 110, the outer periphery of the step portion 120 and the connecting surface connecting the two all have the insulating layer 500, so as to prevent the current from passing through the bearing, thereby avoiding the electric corrosion failure. The outer periphery of the step portion 120 is recessed radially inwardly relative to the outer periphery of the main body portion 110, and the recessed step portion 120 can provide the installation space for the O-ring 600. The O-ring 600 is squeezed between the bearing seat 700 and the step portion 120, which increases the friction between the outer ring 100 and the bearing seat 700, thereby avoiding the running-out of the outer ring 100. In the process of axial floating of the insulating bearing, the O-ring 600 can roll axially, so as to change the sliding friction into rolling friction, thereby avoiding the friction noise. Meanwhile, the step portion 120 is located at the end of the main body portion 110, which is convenient for processing and does not affect the injection molding demolding.

[0037] In the embodiment of the present application, the insulating bearing can be sold as a whole component, that is, the manufacturer assembles the parts into the insulating bearing as a whole component for sale. The user can purchase the insulating bearing, the O-ring 600 and the bearing seat 700 respectively and then assemble them.

[0038] In another embodiment of the present application, the insulating bearing assembly formed by installing the O-ring 600 on the step portion 120 of the insulating bearing can be sold as a whole component. The user can purchase the bearing assembly and the bearing seat 700 respectively and then assemble them.

[0039] In still another embodiment of the present application, the insulating bearing assembly formed by installing the O-ring 600 on the step portion 120 of the insulating bearing and then installing it into the bearing seat 700 can be sold as a whole component. The user can directly purchase the bearing assembly for use.

[0040] As described above, although the exemplary embodiments of the present application have been described with reference to the drawings in the description, the present application is not limited to the specific embodiments described above, and the scope of protection of the present application should be defined by the claims and their equivalent meanings.

[0041] LIST OF REFERENCE NUMERALS outer ring 100, 10 main body portion 110 step portion 120 inner ring 200, 20 rolling element 300, 30 retainer 400, 40 insulating layer 500, 50 O-ring 600 bearing seat 700

Claims

1. An insulating bearing, characterized in that, The insulating bearing comprises: an outer ring (100), an inner ring (200), a rolling element (300), and a retainer (400), the outer ring (100) comprises: a main body portion (110); and a stepped portion (120), the stepped portion (120) is located at an axial end of the main body portion (110), an outer periphery of the stepped portion (120) is recessed radially inward relative to an outer periphery of the main body portion (110), the outer periphery of the main body portion (110), the outer periphery of the stepped portion (120), and a connecting surface connecting the two all have an insulating layer (500), and the stepped portion (120) is used for mounting an O-ring (600).

2. The insulating bearing of claim 1, wherein, An outer surface of the insulating layer (500) of the stepped portion (120) is recessed radially inward relative to an outer surface of the insulating layer (500) of the main body portion (110).

3. The insulated bearing of claim 1, wherein, The connecting surface is perpendicular to the outer periphery of the main body portion (110) and the outer periphery of the stepped portion (120).

4. The insulated bearing of claim 1, wherein, An end of the main body portion (110) away from the stepped portion (120) has the insulating layer (500), and an end of the stepped portion (120) away from the main body portion (110) has the insulating layer (500).

5. An insulated bearing assembly characterized by, The insulating bearing assembly comprises an O-ring (600) and the insulating bearing according to any one of claims 1-4.

6. The insulated bearing assembly of claim 5, wherein, The O-ring (600) is located at the outer periphery of the stepped portion (120), and the O-ring (600) is interference-fitted with the outer periphery of the stepped portion (120).

7. The insulated bearing assembly of claim 6, wherein, An outer periphery of the O-ring (600) is protruded radially outward relative to an outer periphery of the main body portion (110).

8. The insulated bearing assembly of claim 7, wherein, The insulating bearing assembly further comprises a bearing seat (700), an outer periphery of the main body portion (110) is fitted with an inner periphery of the bearing seat (700), there is a receiving space between the outer periphery of the stepped portion (120) and the inner periphery of the bearing seat (700), and the O-ring (600) is located in the receiving space.

9. The insulated bearing assembly of claim 8, wherein, The O-ring (600) is interference-fitted with the inner periphery of the bearing seat (700).

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