Insulated bearing and method for manufacturing insulated bearing

Abstract

The invention relates to the technical field of bearing manufacturing, in particular to an insulating bearing and a manufacturing method of the insulating bearing. The insulating bearing manufactured by the manufacturing method of the insulating bearing comprises an outer ring, an inner ring, a rolling body and a retainer, the outer ring is arranged on the periphery of the inner ring in a sleeving manner and is coaxial with the inner ring, the retainer is clamped between the outer ring and the inner ring, the rolling body is movably mounted on the retainer, an insulating layer covers the peripheral wall and the axial end face of the outer ring, and the insulating layer is arranged between the outer ring and the inner ring. The avoiding grooves are distributed in the outer surface of the insulating layer at intervals and are configured to reduce the contact area between the outer surface of the insulating layer and the bearing bush, so that the capacitance of the insulating bearing can be reduced, the capacitive reactance of the insulating bearing can be increased, the insulating bearing can bear higher high-frequency alternating voltage, and the effect of improving the insulating property of the insulating bearing is achieved; and the actual requirement of the insulating bearing under the high-frequency alternating-current voltage working condition is met.

Description

Technical Field

[0001] The invention relates to the technical field of bearing manufacturing, and in particular to an insulating bearing and a manufacturing method of the insulating bearing. Background Art

[0002] Insulated bearings are a general term for bearings that can block the passage of electric current and have insulating properties. Take ceramic insulated bearings as an example. Ceramic insulated bearings use plasma spraying technology to spray an insulating layer on the outer surface of the bearing. The insulating layer has a strong bond with the substrate and good insulation properties, which can prevent the induced current from corroding the bearing and increase the service life of the bearing.

[0003] When the voltage applied to the two ends of the insulating layer of the insulating bearing exceeds a certain critical value, the current in the insulating layer increases sharply, and the molecular structure is gradually destroyed until the insulating layer loses its inherent insulating properties, resulting in the phenomenon of insulation layer breakdown. If it is a DC voltage or a low-frequency AC voltage, the insulation effect depends on the pure resistance value of the insulating layer; if it is a high-frequency AC voltage, it depends on the capacitive reactance value of the insulating layer. For high-frequency AC voltage working conditions, existing insulating bearings are prone to failure and cannot meet actual needs. In order for the insulated bearing to withstand higher high-frequency AC voltages, the capacitive reactance of the insulating layer needs to be increased.

[0004] Therefore, it is urgent to invent an insulating bearing and a method for manufacturing an insulating bearing to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide an insulating bearing and a method for manufacturing an insulating bearing, so that the insulating bearing can withstand a higher high-frequency AC voltage and meet the actual needs under high-frequency AC voltage working conditions.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] An insulating bearing comprises an outer ring, an inner ring, a rolling element and a retaining frame, wherein the outer ring is sleeved on the outer circumference of the inner ring and is coaxially arranged with the inner ring, the retaining frame is clamped between the outer ring and the inner ring, and the rolling element is movably mounted on the retaining frame;

[0008] The outer peripheral wall and the axial end face of the outer ring are covered with an insulating layer, and the outer surface of the insulating layer is filled with avoidance grooves at intervals, and the avoidance grooves are configured to reduce the contact area between the outer surface of the insulating layer and the bearing shell.

[0009] As an optional solution, the shortest distance D between two adjacent avoidance grooves is not less than 8 mm, and the groove width B of the avoidance groove is not greater than 0.2 mm.

[0010] As an optional solution, the ratio of the groove depth of the avoidance groove to the thickness of the insulating layer is not greater than 1 / 4.

[0011] As an optional solution, the avoidance groove rotates around the axial direction of the outer ring.

[0012] As an optional solution, the avoidance groove extends in the radial direction of the outer ring while rotating around the axial direction of the outer ring.

[0013] As an optional solution, the avoidance grooves are divided into two groups, and the two groups of avoidance grooves have opposite rotation directions along the outer ring.

[0014] As an optional solution, the material of the insulating layer is ceramic.

[0015] As an optional solution, the insulating bearing further includes:

[0016] The sealing rings are respectively arranged on the two end surfaces of the retaining frame in the axial direction, and the sealing rings are used to seal the gap between the outer ring and the inner ring.

[0017] As an alternative, the gaps between the rolling elements, the cage, the outer ring, and the inner ring are filled with lubricating oil or lubricating paste.

[0018] A method for manufacturing an insulating bearing, used for manufacturing the insulating bearing as described above, comprises the following steps:

[0019] S1. Processing the outer ring, the inner ring, the retaining frame and the rolling element which are not covered with the insulating layer respectively;

[0020] S2, coating the insulating layer on the outer peripheral wall and the axial end surface of the outer ring not covered with the insulating layer;

[0021] S3, processing the avoidance groove on the outer surface of the insulating layer;

[0022] S4. Assemble the outer ring covered with the insulating layer, the inner ring, the retaining frame and the rolling element together.

[0023] Beneficial effects of the present invention:

[0024] The insulating bearing provided by the present invention realizes the assembly of the bearing by sleeve-arranging the outer ring on the outer periphery of the inner ring and coaxially arranging the inner ring, clamping the cage between the outer ring and the inner ring, and movably mounting the rolling element on the cage. The outer peripheral wall and the axial end face of the outer ring are covered with an insulating layer, and the outer ring is insulated and isolated by the insulating layer, thereby providing an insulating function for the bearing. The outer surface of the insulating layer is filled with avoidance grooves at intervals to reduce the contact area between the outer surface of the insulating layer and the bearing bush. According to the calculation formula of capacitance Among them, ε is a constant, S is the area of ​​the capacitor plates, d is the distance between the capacitor plates, and k is the electrostatic force constant. By reducing the contact area between the outer surface of the insulating layer and the bearing, the capacitance of the insulating bearing can be reduced. Combined with the calculation formula of capacitive reactance, Among them, Xc is the capacitive reactance, f is the frequency of alternating current, and C is the capacitance of the capacitor. The smaller the capacitance value, the larger the capacitive reactance, which can increase the capacitive reactance of the insulating bearing, thereby improving the insulating bearing's ability to withstand higher high-frequency AC voltages, thereby achieving the effect of improving the insulation performance of the insulating bearing and meeting the actual needs of the insulating bearing under high-frequency AC voltage conditions.

[0025] The present invention also provides a method for manufacturing an insulating bearing. By applying the manufacturing method to produce the above-mentioned insulating bearing, the capacitive reactance of the insulating bearing can be increased, thereby improving the insulating bearing's ability to withstand higher high-frequency AC voltages, thereby achieving the effect of improving the insulation performance of the insulating bearing and meeting the actual needs of the insulating bearing under high-frequency AC voltage conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the structure of the outer ring provided in the first embodiment of the present invention;

[0027] Figure 2 is a side view of the outer ring provided in the first embodiment of the present invention;

[0028] Figure 3 is a cross-sectional schematic diagram of an outer ring provided in Embodiment 1 of the present invention;

[0029] Figure 4 yes Figure 3 A partial enlarged view of the middle A;

[0030] Figure 5 is a schematic diagram of the structure of the outer ring provided in the second embodiment of the present invention;

[0031] Figure 6 is a side view of the outer ring provided in the second embodiment of the present invention;

[0032] Figure 7 is a cross-sectional schematic diagram of an outer ring provided in Embodiment 2 of the present invention;

[0033] Figure 8 yes Figure 7 A partial enlarged view of point B in the middle;

[0034] Fig. 9 is a schematic diagram of the structure of the outer ring provided in the third embodiment of the present invention;

[0035] Fig.10 is a side view of the outer ring provided in the third embodiment of the present invention;

[0036] Fig.11is a schematic diagram of the structure of the outer ring provided in the fourth embodiment of the present invention;

[0037] Fig.12 is a side view of the outer ring provided in the fourth embodiment of the present invention;

[0038] Fig.13 is a schematic diagram of the structure of the outer ring provided in the fifth embodiment of the present invention;

[0039] Fig.14 is a side view of the outer ring provided in the fifth embodiment of the present invention;

[0040] Fig.15 is a schematic diagram of the structure of the outer ring provided in Embodiment 6 of the present invention;

[0041] Fig.16 is a side view of the outer ring provided in the sixth embodiment of the present invention;

[0042] Fig.17 This is a flow chart of a method for manufacturing an insulating bearing provided in Embodiment 7 of the present invention.

[0043] In the figure:

[0044] 100. Outer ring; 110. Insulation layer; 111. Avoidance groove. DETAILED DESCRIPTION

[0045] In order to make the technical problem solved by the present invention, the technical solution adopted and the technical effect achieved more clearly, the technical solution of the present invention is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0046] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0048] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0049] Embodiment 1

[0050] Taking ceramic insulated bearings as an example, ceramic insulated bearings use a plasma spraying process to spray an insulating layer on the outer surface of the bearing. The insulating layer has a strong bond with the substrate and good insulation performance, which can avoid the electro-corrosion effect of the induced current on the bearing and increase the service life of the bearing. When the voltage applied to both ends of the insulating layer of the insulated bearing exceeds a certain critical value, the current in the insulating layer increases sharply, and the molecular structure is gradually destroyed until the insulating layer loses its inherent insulation performance, resulting in the phenomenon of insulation layer breakdown. If it is a DC voltage or a low-frequency AC voltage, the insulation effect depends on the pure resistance value of the insulating layer; if it is a high-frequency AC voltage, it depends on the capacitive reactance value of the insulating layer. For high-frequency AC voltage working conditions, existing insulated bearings are prone to failure and cannot meet actual needs. In order for insulated bearings to withstand higher high-frequency AC voltages, it is necessary to increase the capacitive reactance of the insulating layer.

[0051] In order to solve the above problems, Figure 1 to Figure 4 As shown, this embodiment provides an insulating bearing. The insulating bearing comprises an outer ring 100, an inner ring, rolling elements and a retaining frame, wherein the outer ring 100 is sleeved on the outer circumference of the inner ring and is coaxially arranged with the inner ring, the retaining frame is clamped between the outer ring 100 and the inner ring, the rolling elements are movably mounted on the retaining frame, the outer circumferential wall and the axial end face of the outer ring 100 are covered with an insulating layer 110, the outer surface of the insulating layer 110 is spaced apart with avoidance grooves 111, and the avoidance grooves 111 are configured to reduce the contact area between the outer surface of the insulating layer and the bearing bush.

[0052] The insulating bearing realizes the assembly of the bearing by sleeve-arranging the outer ring 100 on the outer circumference of the inner ring and coaxially arranging the inner ring, clamping the cage between the outer ring and the inner ring, and movably mounting the rolling element on the cage. The outer circumferential wall and the axial end face of the outer ring 100 are covered with an insulating layer 110, and the outer ring 100 is insulated and isolated by the insulating layer 110, so as to provide an insulating function for the bearing. The outer surface of the insulating layer 110 is filled with avoidance grooves 111 at intervals to reduce the contact area between the outer surface of the insulating layer 110 and the bearing bush. According to the capacitance calculation formula Where ε is a constant, S is the area of ​​the capacitor plates, d is the distance between the capacitor plates, and k is the electrostatic force constant. By reducing the contact area between the outer surface of the insulating layer 110 and the bearing bush, the capacitance of the insulating bearing can be reduced. Combined with the calculation formula of capacitive reactance, Among them, Xc is the capacitive reactance, f is the frequency of alternating current, and C is the capacitance of the capacitor. The smaller the capacitance value, the larger the capacitive reactance, which can increase the capacitive reactance of the insulating bearing, thereby improving the insulating bearing's ability to withstand higher high-frequency AC voltages, thereby achieving the effect of improving the insulation performance of the insulating bearing and meeting the actual needs of the insulating bearing under high-frequency AC voltage conditions.

[0053] In this embodiment, the insulating bearing further includes a sealing ring, wherein the sealing ring is respectively arranged at both end surfaces of the cage in the axial direction, and the sealing ring is used to seal the gap between the outer ring 100 and the inner ring. By respectively arranging sealing rings at both end surfaces of the cage in the axial direction, the sealing rings seal the gap between the outer ring 100 and the inner ring, and the cage and the rolling element can be sealed and accommodated between the outer ring 100 and the inner ring, thereby improving the protection of the rolling element and the cage.

[0054] In addition, in order to further improve the transmission effect of the insulating bearing, the gaps between the sealing ring, the rolling element, the retaining frame, the outer ring 100 and the inner ring are filled with lubricating oil or lubricating paste.

[0055] As an optional solution, the material of the insulating layer 110 is ceramic. Specifically, the ceramic powder is evenly coated on the outer peripheral wall and the axial end face of the outer ring 100 by plasma spraying technology. In other embodiments, the insulating layer 110 can also be other types of insulating materials, which are not specifically limited in this embodiment.

[0056] To further verify the influence of the number of avoidance grooves 111 and the distance D between two adjacent avoidance grooves 111 on the capacitance and insulation resistance of the insulating bearing, in this embodiment, taking the 6320C3 / VL deep groove ball bearing as an example, the thickness of the insulating layer 110 is 0.4 mm, the depth H of the avoidance groove 111 is 0.2 mm, and the width B of the avoidance groove 111 is 0.2 mm. The verification is performed under the premise that the voltage applied to the insulating bearing is 2500VAC, and the specific information is as follows:

[0057]

[0058] Combined with the data in the table, it can be seen that for the 6320C3 / VL deep groove ball bearing, under the premise that the thickness of the insulating layer 110 is 4 mm, the depth of the avoidance groove 111 is 0.2 mm, the groove width B of the avoidance groove 111 is 0.2 mm, and the voltage applied to the insulating bearing is 2500VAC, when the number of avoidance grooves 111 remains unchanged, the change in the spacing between two adjacent avoidance grooves 111 has no effect on the capacitance value. When the number of avoidance grooves 111 increases, the capacitance value is effectively reduced, but when the number of avoidance grooves 111 is too large, the insulation resistance value decreases.

[0059] Therefore, under the premise that the outer surface of the insulating layer 110 is fully covered with the avoidance grooves 111, the spacing D between two adjacent avoidance grooves 111 is not less than 8 mm, and the insulation resistance is greater than 100 GΩ. It should be noted that in the insulation resistance test of the insulating bearing, the insulation bearing is considered normal if the resistance is higher than 1 GΩ, and the insulation bearing is considered excellent if it is above 100 GΩ. Therefore, in order to ensure the excellent rate of the insulating bearing, under the premise that the avoidance grooves 111 are fully covered with the outer surface of the insulating layer 111, the spacing D between two adjacent avoidance grooves 111 is not less than 8 mm.

[0060] It is understandable that increasing the groove width B of the avoidance groove 111 can further reduce the contact area between the insulating layer 110 and the bearing, but increasing the groove width B of the avoidance groove 111 will reduce the structural strength of the insulating layer 110, causing the insulating layer 110 to be compressed and damaged when the insulating layer 110 contacts the bearing, resulting in failure of the insulating layer 110. In addition, increasing the groove width B of the avoidance groove 111 will reduce the insulation resistance of the insulating bearing just like increasing the number of avoidance grooves 111. Therefore, the groove width B of the avoidance groove 111 is not greater than 0.2 mm.

[0061] To further verify the influence of the depth H of the avoidance groove 111 on the capacitance and insulation resistance of the insulating bearing, in this embodiment, taking the 6320C3 / VL deep groove ball bearing as an example, the verification is carried out under the premise that the thickness of the insulating layer 110 is 0.4 mm, the width B of the avoidance groove 111 is 0.2 mm, the number of the avoidance grooves 111 is 7, and the voltage applied to the insulating bearing is 2500VAC. The specific information is as follows:

[0062]

[0063]

[0064] Combined with the data in the table, it can be seen that for 6320C3 / VL deep groove ball bearings, under the premise that the thickness of the insulating layer 110 is 4mm, the number of avoidance grooves 111 is 7, the groove width B of the avoidance groove 111 is 0.2mm, and the voltage applied to the insulating bearing is 2500VAC, the ratio of the depth H of the avoidance groove 111 to the thickness of the insulating layer 110 is not greater than 1 / 4, the insulation resistance value is greater than 100GΩ. Therefore, in order to ensure the excellent rate of the insulating bearing, the ratio of the groove depth of the avoidance groove 111 to the thickness of the insulating layer 110 is not greater than 1 / 4.

[0065] In addition, if Figure 1 to Figure 3 As shown, the avoidance groove 111 rotates around the axial direction of the outer ring 100. By rotating the avoidance groove 111 around the axial direction of the outer ring 100, the processing of the avoidance groove 111 can be facilitated and the processing difficulty of the avoidance groove 111 can be reduced.

[0066] In this embodiment, 7 avoidance grooves 111 are arranged at intervals on the outer surface of the insulating layer 110, and the radial section of each avoidance groove 111 is semicircular. In other embodiments, the radial section of the avoidance groove 111 can also be rectangular, triangular or other shapes, which is not specifically limited in this embodiment.

[0067] Example 1

[0068] In this example 1, the insulating bearing is a 6320C3 / VL deep groove ball bearing, the thickness of the insulating layer 110 is 0.4 mm, the depth H of the avoidance groove 111 is 0.1 mm, the width B of the avoidance groove 111 is 0.2 mm, and the distance between two adjacent avoidance grooves 111 is 8 mm.

[0069] Example 2

[0070] In this example 2, the insulating bearing is a 6320C3 / VL deep groove ball bearing, the thickness of the insulating layer 110 is 0.5 mm, the depth H of the avoidance groove 111 is 0.1 mm, the width B of the avoidance groove 111 is 0.1 mm, and the distance between two adjacent avoidance grooves 111 is 9 mm.

[0071] Example 3

[0072] In this example 3, the insulating bearing is a 6320C3 / VL deep groove ball bearing, the thickness of the insulating layer 110 is 0.4 mm, the depth H of the avoidance groove 111 is 0.08 mm, the width B of the avoidance groove 111 is 0.15 mm, and the distance between two adjacent avoidance grooves 111 is 9 mm.

[0073] Example 4

[0074] In this example 4, the insulating bearing is a 6320C3 / VL deep groove ball bearing, the thickness of the insulating layer 110 is 0.5 mm, the depth H of the avoidance groove 111 is 0.08 mm, the width B of the avoidance groove 111 is 0.2 mm, and the distance between two adjacent avoidance grooves 111 is 8 mm.

[0075] It is understandable that the above examples 1 to 4 are only for illustration. In other embodiments, the distance between two adjacent avoidance grooves 111 can be adjusted within a range of not less than 8 mm, the width of the avoidance groove 111 can be adjusted within a range of not more than 0.2 mm, and the ratio of the depth H of the avoidance groove 111 to the thickness of the insulating layer 110 can be adjusted within a range of not more than 1 / 4 according to actual needs, and this embodiment does not make specific limitations.

[0076] Embodiment 2

[0077] This embodiment provides an insulating bearing. The specific structure of the insulating bearing provided in this embodiment is basically the same as that of the first embodiment. The specific structure of the insulating bearing provided in this embodiment is basically the same as that of the first embodiment. The difference between the specific structure of the insulating bearing provided in this embodiment and that of the first embodiment is that the setting position and number of the avoidance groove 111 are different.

[0078] Specifically, if Figures 5 to 8 As shown, only five avoidance grooves 111 are provided on the insulating layer 110, the spacing between two adjacent avoidance grooves 111 is 1.8 mm, the groove width B of each avoidance groove 111 is 0.1 mm, and the ratio of the groove depth H of each avoidance groove 111 to the thickness of the insulating layer 110 is 1 / 5. The five avoidance grooves 111 are only provided on the outer surface of the insulating layer 111 corresponding to the outer peripheral wall of the outer ring 100, so as to further reduce the processing difficulty of the avoidance grooves 111 without affecting the insulating effect of the insulating layer 110.

[0079] Embodiment 3

[0080] The present embodiment provides an insulating bearing. The specific structure of the insulating bearing provided in the present embodiment is basically the same as that of the first embodiment. The specific structure of the insulating bearing provided in the present embodiment is basically the same as that of the first embodiment. The specific structure of the insulating bearing provided in the present embodiment is different from that of the first embodiment in that the extension direction of the avoidance groove 111 is different.

[0081] Specifically, if Fig. 9 and Fig.10 As shown, the outer surface of the insulating layer 110 is provided with 12 avoidance grooves 111, and the 12 avoidance grooves 111 are only arranged on the outer surface of the insulating layer 111 corresponding to the outer peripheral wall of the outer ring 100, and the spacing between two adjacent avoidance grooves 111 is 1.4mm, the groove width B of each avoidance groove 111 is 0.1mm, and the ratio of the groove depth H of each avoidance groove 111 to the thickness of the insulating layer 110 is 1 / 5. Each avoidance groove 111 rotates around the axial direction of the outer ring 100 and extends along the radial direction of the outer ring 100, so as to improve the aesthetics of the insulating layer 110 without affecting the insulation resistance of the insulating layer 110.

[0082] Embodiment 4

[0083] This embodiment provides an insulating bearing. The specific structure of the insulating bearing provided in this embodiment is basically the same as that of Example 3. The specific structure of the insulating bearing provided in this embodiment is basically the same as that of Example 3. The specific structure of the insulating bearing provided in this embodiment is different from that of Example 3 in that the number of avoidance grooves 111 is different.

[0084] Specifically, if Fig.11 and Fig.12As shown, 20 avoidance grooves 111 are arranged on the outer surface of the insulating layer 110, the spacing between two adjacent avoidance grooves 111 is 1.0 mm, the groove width B of each avoidance groove 111 is 0.1 mm, and the ratio of the groove depth H of each avoidance groove 111 to the thickness of the insulating layer 110 is 1 / 5.

[0085] Embodiment 5

[0086] This embodiment provides an insulating bearing. The specific structure of the insulating bearing provided in this embodiment is basically the same as that of Example 3. The specific structure of the insulating bearing provided in this embodiment is basically the same as that of Example 3. The specific structure of the insulating bearing provided in this embodiment is different from that of Example 3 in that: the extension direction of the avoidance groove 111 is different.

[0087] Specifically, if Fig.13 and Fig.14 As shown, 12 avoidance grooves 111 are provided on the outer surface of the insulating layer 110, the spacing between two adjacent avoidance grooves 111 is 1.4 mm, the groove width B of each avoidance groove 111 is 0.1 mm, the ratio of the groove depth H of each avoidance groove 111 to the thickness of the insulating layer 110 is 1 / 5, and the 12 avoidance grooves 111 are divided into two groups, and the two groups of avoidance grooves 111 rotate in opposite directions around the axial direction of the outer ring 100, so as to further improve the aesthetics of the insulating layer 110 without affecting the insulation resistance of the insulating layer 110.

[0088] Embodiment 6

[0089] This embodiment provides an insulating bearing. The specific structure of the insulating bearing provided in this embodiment is basically the same as that of Example 5. The specific structure of the insulating bearing provided in this embodiment is basically the same as that of Example 5. The specific structure of the insulating bearing provided in this embodiment is different from that of Example 3 in that the number of avoidance grooves 111 is different.

[0090] Specifically, if Fig.15 and Fig.16 As shown, 20 avoidance grooves 111 are arranged on the outer surface of the insulating layer 110, the spacing between two adjacent avoidance grooves 111 is 0.8 mm, the groove width B of each avoidance groove 111 is 0.1 mm, and the ratio of the groove depth H of each avoidance groove 111 to the thickness of the insulating layer 110 is 1 / 5.

[0091] Embodiment 7

[0092] like Fig.17 As shown, this embodiment provides a method for manufacturing an insulating bearing, which is used to manufacture the insulating bearings provided by the above-mentioned embodiments 1 to 6, and specifically includes the following steps:

[0093] S1, respectively processing the outer ring 100, the inner ring, the cage and the rolling element which are not covered with the insulating layer 110;

[0094] S2, coating the insulating layer 110 on the outer peripheral wall and the axial end surface of the outer ring 100 not covered with the insulating layer 110;

[0095] S3, processing an avoidance groove 111 on the outer surface of the insulating layer 110;

[0096] S4. Assemble the outer ring 100 covered with the insulating layer 110, the inner ring, the retaining frame and the rolling elements together.

[0097] By applying the manufacturing method of the insulating bearing to produce the insulating bearings provided in the above-mentioned embodiments 1 to 6, the capacitive reactance of the insulating bearing can be increased, thereby improving the insulating bearing's ability to withstand higher high-frequency AC voltages, thereby achieving the effect of improving the insulation performance of the insulating bearing and meeting the actual needs of the insulating bearing under high-frequency AC voltage conditions.

[0098] It should be noted that after the above step S4, lubricating oil or lubricating paste is first filled between the outer ring 100, the inner ring, the cage and the rolling elements, and then sealing rings are fixed at both axial ends of the cage to increase the service life of the insulating bearing.

[0099] In addition, in step S3 , the specific processing method for processing the avoidance groove 111 can be the existing grinding processing, which will not be described in detail here.

[0100] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Insulated bearing, characterized in that: It comprises an outer ring (100), an inner ring, a rolling body and a retaining frame, wherein the outer ring (100) is sleeved on the outer circumference of the inner ring and is coaxially arranged with the inner ring, the retaining frame is clamped between the outer ring (100) and the inner ring, and the rolling body is movably mounted on the retaining frame; The outer peripheral wall and the axial end face of the outer ring (100) are covered with an insulating layer (110), and the outer surface of the insulating layer (110) is spaced apart with avoidance grooves (111), and the avoidance grooves (111) are configured to reduce the contact area between the outer surface of the insulating layer and the bearing shell.

2. The insulating bearing according to claim 1, characterized in that: The shortest distance D between two adjacent avoidance grooves (111) is not less than 8 mm, and the groove width B of the avoidance groove (111) is not greater than 0.2 mm.

3. The insulating bearing according to claim 1, characterized in that: The ratio of the groove depth of the avoidance groove (111) to the thickness of the insulating layer (110) is no greater than 1 / 4.

4. The insulating bearing according to claim 1, characterized in that: The avoidance groove (111) rotates around the axial direction of the outer ring (100).

5. The insulating bearing according to claim 1, characterized in that: The avoidance groove (111) extends in the radial direction of the outer ring (100) while rotating around the axial direction of the outer ring (100).

6. The insulating bearing according to claim 5, characterized in that: The avoidance grooves (111) are divided into two groups, and the two groups of avoidance grooves have opposite rotation directions along the outer ring (100).

7. The insulating bearing according to claim 1, characterized in that: The material of the insulating layer (110) is ceramic.

8. The insulating bearing according to claim 1, characterized in that: The insulating bearing also includes: A sealing ring is provided at both end surfaces of the retaining frame in the axial direction, and is used to seal the gap between the outer ring (100) and the inner ring.

9. The insulating bearing according to claim 1, characterized in that: The gaps between the rolling element, the retaining frame, the outer ring (100) and the inner ring are filled with lubricating oil or lubricating paste.

10. A method for manufacturing an insulating bearing, characterized in that: The method for manufacturing the insulating bearing according to any one of claims 1 to 9 comprises the following steps: S1. Processing the outer ring (100) not covered with the insulating layer (110), the inner ring, the retaining frame, and the rolling element respectively; S2. coating the insulating layer (110) on the outer peripheral wall and the axial end surface of the outer ring (100) that are not covered with the insulating layer (110); S3, machining the avoidance groove (111) on the outer surface of the insulating layer (110); S4. Assemble the outer ring (100) covered with the insulating layer (110), the inner ring, the retaining frame, and the rolling element together.

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