Insulated bearing and manufacturing method thereof

Abstract

At least one of an outer ring and an inner ring of the insulating bearing is arranged to be an insulating ferrule, the insulating ferrule comprises a body, and the body further comprises a roller path, a bearing body and a bearing body, an axial end face; and a radial outer peripheral surface disposed opposite to the raceway in the radial direction. A material removal portion is included on a surface of the body, and an insulating layer is overmolded on the body and molded into the material removal portion. The invention further provides a manufacturing method of the insulating bearing. The manufacturing method comprises the step that a sprue of an injection molding machine for overmolding the insulating layer is arranged to enable a weld line of the overmolded insulating layer to avoid a main stress bearing area of the insulating ferrule and / or to be formed at the position, with the maximum thickness, of the insulating layer. The invention provides an insulating bearing and a manufacturing method thereof for solving the problem of electric corrosion of a bearing used in a high-pressure environment. Good electrical insulation of the bearing is achieved, the insulation layer can be further prevented from moving in the axial direction and / or the circumferential direction, the electrical performance of the insulation layer and the whole bearing is greatly improved, and the service life of the insulation layer and the whole bearing is greatly prolonged.

Description

Technical Field

[0001] The present invention relates to an insulated bearing and a manufacturing method thereof. Background Art

[0002] Bearings are widely used in various types of equipment. Different application fields often put forward various different requirements for bearings.

[0003] Taking an electrical equipment such as an electric vehicle as an example, since its drive motor shaft, transmission drive shaft, etc. need to use bearings, therefore, such bearings operate in a charged environment. Moreover, since the charging of electric vehicles increasingly pursues to increase the charging voltage to shorten the charging time, the bearings on the motor shaft are also exposed to an increasingly high voltage environment. When there is current passing through the bearing, it will cause electrical corrosion to the bearing.

[0004] Therefore, the prior art proposes to electrically insulate the bearing to prevent current from flowing through the bearing. Common insulation solutions include making at least one of the outer ring, rolling elements, and inner ring of the bearing electrically insulated. For example, one solution is to apply an insulating coating to the outer ring, inner ring, or rolling elements, or even directly manufacture the rolling elements with an insulating material (such as ceramics).

[0005] There is also a solution to mold an insulating layer outside the outer ring / inner ring of the bearing, and this insulating layer is coated and molded onto the outer peripheral surface and axial end face opposite to the raceway. However, since the bearing often moves at high speed and under high load, although the insulating layer is coated and molded on the outer ring / inner ring, after long-term operation, the insulating layer will inevitably move axially and / or circumferentially, thereby causing damage to the insulating layer and affecting the insulation of the entire bearing.

[0006] Therefore, there is a need in the art for a technical solution that can effectively provide insulation and effectively prevent the movement of the insulating layer. Summary of the Invention

[0007] In view of the problems and needs mentioned above, the present disclosure proposes a novel technical solution, which solves the above problems and brings other technical effects due to the following technical features.

[0008] The present invention provides an insulated bearing, including an outer ring, an inner ring, and rolling elements disposed between the outer ring and the inner ring. Among them, at least one of the outer ring and the inner ring is provided as an insulating ring. The insulating ring includes a body, and the body further includes: a raceway; an axial end face; a radial outer peripheral surface, which is disposed opposite to the raceway in the radial direction; wherein, a material removal part is included on the surface of the body, and an insulating layer is coated and molded on the body and molded into the material removal part.

[0009] The present invention also provides a manufacturing method of the insulating bearing as described above, including: setting the gate of the injection molding machine for the coating molding of the insulating layer so that the weld line of the insulating layer after coating molding avoids the main stress-bearing area of the insulating ring and / or is formed at the position where the thickness of the insulating layer is the largest.

[0010] The present invention provides an insulating bearing and a manufacturing method thereof for solving the problem of electrocorrosion of bearings used in high-voltage environments. The present invention not only achieves good electrical insulation of the bearing, but also can further prevent the movement of the insulating layer along the axial direction and / or the circumferential direction, greatly improving the electrical performance and service life of the insulating layer and the entire bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A cross-sectional view of an insulating ring according to a first preferred embodiment of the present invention;

[0012] Figure 2 A partial perspective view of an insulating ring and an enlarged view of a knurled structure according to a first preferred embodiment of the present invention;

[0013] Figure 3 A cross-sectional view of an insulating ring according to a second preferred embodiment of the present invention;

[0014] Figure 4 An enlarged view of a knurled structure in an insulating ring according to a second preferred embodiment of the present invention;

[0015] Figure 5 A cross-sectional view of an insulating ring according to a third preferred embodiment of the present invention;

[0016] Figure 6 An enlarged view of a knurled structure in an insulating ring according to a third preferred embodiment of the present invention;

[0017] Figure 7 A cross-sectional view of an insulating ring according to a fourth preferred embodiment of the present invention;

[0018] Figure 8A and Figure 8B A cross-sectional view of an insulating ring according to a fifth preferred embodiment of the present invention;

[0019] Figure 9 A cross-sectional view of an insulating ring according to a modification of the present invention;

[0020] Figure 10 A schematic diagram for explaining the formation of the weld line of the insulating layer;

[0021] Figure 11 A schematic diagram of the positions of the gates in the manufacturing method of the insulating bearing according to a preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] To make the objectives, technical solutions, and advantages of the technical solutions of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of specific embodiments of the present disclosure. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts belong to the scope of protection of the present disclosure.

[0023] Compared with the embodiments shown in the accompanying drawings, the feasible embodiments within the scope of protection of the present disclosure may have fewer components, have other components not shown in the accompanying drawings, different components, differently arranged components, or differently connected components, etc. In addition, two or more components in the accompanying drawings may be implemented in a single component, or a single component shown in the accompanying drawings may be implemented as multiple separate components.

[0024] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art to which the present disclosure pertains. The "first", "second", and similar terms used in the specification and claims of the present patent application do not denote any order, quantity, or importance, but are only used to distinguish different components. When the number of components is not specified, the number of components may be one or more; similarly, terms such as "a", "the", "said", etc. do not necessarily denote a quantity limitation. The term "comprising" or "including" and similar terms mean that the elements or items appearing before this term cover the elements or items listed after this term and their equivalents, without excluding other elements or items. Terms such as "installed", "set", "connected", or "coupled" are not limited to physical or mechanical installation, setting, or connection, but may include electrical installation, setting, or connection, whether direct or indirect. Terms such as "upper", "lower", "left", "right", etc. are only used to represent the relative orientation relationship during the use of the device or the orientation relationship shown in the accompanying drawings. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0025] For ease of description, in this document, the direction of the axis of rotation of the bearing is referred to as the axial direction, and the direction perpendicular to this axial direction is referred to as the radial direction. The terms "inner / inside" mean along the direction towards the inside of the bearing. Conversely, the terms "outer / outside" mean towards the outside of the bearing. Additionally, in different embodiments, the same reference numerals are used to refer to components having the same or similar structures and functions.

[0026] The insulating bearing according to the present invention will be described below with reference to the preferred embodiments shown in the accompanying drawings. The insulating bearing according to the present invention includes an outer ring, an inner ring (not shown), rolling elements (not shown) provided between the outer ring and the inner ring, etc. Generally, the outer ring and the inner ring are also collectively referred to as raceways. As described above, in order to achieve the insulating performance of the bearing, at least one of the outer ring and the inner ring can be set as an insulating raceway. Therefore, the insulating raceway of the insulating bearing according to the present invention includes a body, and the body further includes: a raceway; an axial end face; a radial outer peripheral face, which is arranged to face away from the raceway in the radial direction; wherein, a groove is included on the surface of the body, and an insulating layer is overmolded on the body 1 and embedded into the groove, so that the groove can effectively hold the insulating layer to prevent the insulating layer from moving axially / circumferentially. It should be understood that the surface can be any suitable one or more surfaces on the insulating raceway body (of course, this surface does not include the raceway surface), and the groove can be grooves of any form and quantity formed on this surface.

[0027] The insulating bearing according to the present invention will be further introduced below with reference to the preferred embodiments of the present invention.

[0028] Figure 1 and Figure 2 The first preferred embodiment according to the present invention is shown. This embodiment and other embodiments hereinafter are described by taking the outer ring of the bearing as an example to introduce the characteristics of the insulating bearing and its insulating raceway according to the present invention.

[0029] Specifically, the body 1 of the insulating raceway of the first preferred embodiment includes: a raceway 2; an axial end face 3; a radial outer peripheral face 4, which is arranged to face away from the raceway 2 in the radial direction; an axial flange 5, which protrudes axially outward relative to the axial end face 3 and has a radial inner peripheral face 50 facing the inner side of the bearing (see Figure 2 ), the radial inner peripheral face 50 includes an inner radial groove 51 (which is recessed substantially in the radial direction); wherein, an insulating layer 6 is overmolded on the radial outer peripheral face 4 and the axial flange 5, and the insulating layer 6 is embedded into the inner radial groove 51.

[0030] Figure 1 The left figure of shows the state before the insulating layer 6 is overmolded, Figure 1 and the right figure of shows the state after the insulating layer 6 has been overmolded.

[0031] It should be understood that the inner radial groove 51 can be formed by any suitable means, such as by machining such as turning. The insulating layer 6 can also be formed by any suitable overmolding means. According to the present invention, by providing such an inner radial groove 51, the molded insulating layer 6 is embedded into the inner radial groove, so that the movement of the insulating layer 6 in the axial direction X can be effectively prevented.

[0032] Further referring toFigure 2 , which shows a partial perspective view of the insulating ring and an enlarged view of part A. Further preferably, the inner radial groove 51 further includes a knurling structure 80. The knurling structure 80 is processed by a knurling tool to form an uneven structure on the surface of the inner radial groove 51, that is to say, dozens or even hundreds of smaller grooves 81 are further processed in the inner radial groove 51. The knurling structure 80 can be, for example, straight knurling. In addition, as Figure 2 shown, the knurling structure 80 is formed on the side of the inner radial groove 51 that is farther from the raceway 2. However, according to actual needs, in a preferred embodiment not shown, such a knurling structure can also be formed on the other side and / or the bottom surface of the inner radial groove 51 that is closer to the raceway 2.

[0033] By processing such a knurling structure 80 in the inner radial groove 51, the insulating layer 6 will be further embedded into the grooves 81 of the knurling structure 80, thereby strengthening the connection strength between the insulating layer 6 and the inner radial groove 51. And since the knurling structure 80 is distributed in the circumferential direction of the ring body 1, the circumferential movement of the insulating layer 6 can be further prevented.

[0034] Figure 3 shows a second preferred embodiment of the present invention. In this preferred embodiment, the axial flange 5 of the body 1 of the insulating ring may include an axial groove 53 (which is recessed substantially in the axial direction) on its axially outer end face 52, and the insulating layer 6 is further embedded into the axial groove 53, as Figure 3 shown in the right figure of

[0035] Further preferably, as Figure 4 shown, the axial groove 53 may also include a knurling structure 80, and the insulating layer 6 is further embedded into the grooves 81 of the knurling structure 80 to further strengthen the connection between the insulating layer 60 and the axial groove 53, thereby preventing the circumferential movement of the insulating layer 6. The knurling structure 80 is formed, for example, in the bottom surface of the axial groove 53. According to an embodiment not shown, the knurling structure can also be formed in the side surface of the axial groove 53.

[0036] Figure 5 shows a third preferred embodiment of the present invention, which is a further improvement on the first and / or second preferred embodiments. In this third preferred embodiment, the body 1 of the insulating ring further includes corner grooves 7 provided at the intersection between the radially outer peripheral surface 4 and the axial flange 5. The corner grooves 7 are preferably provided in two, and the insulating layer 6 is further embedded into the corner grooves 7, as Figure 5 shown in the right figure of

[0037] By providing such corner grooves 7, the axial movement of the insulating layer 6 can also be effectively prevented.

[0037] Further preferably, refer toFigure 6 In the corner groove 7, a knurling structure 80 may also be included, and the insulating layer 6 is further embedded into the groove 81 of the knurling structure 80 to further strengthen the connection between the insulating layer 60 and the axial groove 53. As Figure 6 shown, the knurling structure 80 is provided on the bottom surface of the corner groove 7. According to an embodiment not shown, the knurling structure 80 may also be provided on the side surface of the corner groove 7.

[0038] Figure 7 The fourth preferred embodiment of the present invention is shown. Although Figure 7 with Figure 5 the cross-sectional view of the third embodiment as a reference for display, it should be understood that it may be a variant of any of the foregoing preferred embodiments, or may also be implemented independently.

[0039] Specifically, in this fourth preferred embodiment, the radially outer peripheral surface 4 of the insulating ferrule body 1 may include outer radial grooves 41 (shown in dashed lines, recessed substantially in the radial direction). The outer radial grooves 41 are preferably provided in two, and the insulating layer 6 is further embedded into the outer radial grooves 41.

[0040] Further preferably, the outer radial grooves 41 may also include a knurling structure (not shown), for example, provided on the bottom surface and / or side surface of the outer radial grooves 41, and the insulating layer 6 is further embedded into the groove of the knurling structure.

[0041] It should be understood that when only such outer radial grooves 41 are formed on the radially outer peripheral surface 4, they exist independently of the above-mentioned other grooves and can also play an effect of preventing the axial / circumferential movement of the insulating ferrule. Therefore, the axial flange 5 and its related grooves in the foregoing preferred embodiments may also be omitted. Therefore, the position of the outer radial grooves 41 can be flexibly set. For example, it may also be like Figure 5 the corner groove 7 in the third preferred embodiment, provided at the intersection between the radially outer peripheral surface 4 and the axial end face 3.

[0042] In addition, since the insulating ferrule often has to bear a certain radial force and the radial force mainly acts on the main force-bearing area in the middle of the insulating ferrule (as shown by the dashed ellipse in Figure 7 ), therefore, if the outer radial grooves 41 are provided in the middle of the insulating ferrule, it will cause a large stress concentration. Therefore, further preferably, the outer radial grooves 41 are provided to be offset axially with respect to the raceway symmetry plane P (the raceway symmetry plane P is perpendicular to the axial direction X and the raceway 2 is substantially symmetric about the raceway symmetry plane P), so that the outer radial grooves 41 are away from the main force-bearing area of the insulating ferrule, thereby avoiding an adverse impact on the stress condition of the bearing caused by the outer radial grooves 41.

[0043] In addition, sinceFigure 6 In the embodiment, the groove is provided at the corner, so that there is no groove on the outer peripheral surface 4 in the radial direction. Therefore, the force-bearing condition is relatively better than that of the Figure 7 embodiment and is more suitable for bearings that need to withstand large radial forces.

[0044] According to a further preferred modification of the present invention, any one of the inner radial groove 51, the axial groove 53, the corner groove 7, and the outer radial groove 41 described above can be provided as a continuous groove or a plurality of discontinuous grooves in the circumferential direction. When forming a plurality of discontinuous grooves (not shown), the plurality of grooves can be spaced evenly or unevenly in the circumferential direction, and the number thereof can also be set and adjusted according to actual needs. Therefore, the circumferential movement of the insulating layer can also be effectively prevented.

[0045] According to a further preferred modification of the present invention, in addition to providing a knurling structure in the various grooves as described above, a knurling structure (not shown) can also be provided on at least one of the outer peripheral surface 4 in the radial direction and the axially outer end surface 52 of the axial flange 5, such as diamond knurling, and the insulating layer 6 is further embedded in the groove of the knurling structure.

[0046] Preferably, the material of the insulating layer 6 can include one of the following: polyether ether ketone (PEEK), polyphenylene sulfide (PPS), and polyimide (PI). Such materials not only have good insulation properties, but also take into account strength and wear resistance, and are more suitable for use in the insulating bearings according to the present invention. Further preferably, for the case where the bearing needs to withstand large forces, the material of the insulating layer 6 can also be added with reinforcing fibers to further enhance the stiffness of the insulating layer 6. The reinforcing fibers are, for example, glass fibers. For example, PEEK-GF30 (adding 30% glass fibers to PEEK) can be used as the material of the insulating layer 6. In addition, the thickness of the insulating layer 6 can be appropriately set according to the structure applied by the bearing, the insulation performance requirements, etc. For example, for the bearings commonly used in electric drive assemblies of electric vehicles, in order to avoid electrocorrosion, the thickness of the insulating layer 6 needs to be set to be greater than or equal to 0.45 mm, preferably between 0.6 mm and 1 mm, and more preferably 0.8 mm.

[0047] On the other hand, in the foregoing preferred embodiments, the molded insulating layer 6 is formed as the outermost layer of the insulating ring. Considering the application environment of the bearing, especially when the outer ring is manufactured as an insulating ring, since the outer ring usually also contacts other components (such as the housing), and sometimes there may also be a fitting and / or movement relationship with other components, the insulating layer 6 formed by injection molding is not conducive to forming an accurate fit with other components due to its poor dimensional accuracy. Moreover, during the transportation of the bearing, the insulating layer 6 is also prone to being bumped and worn, which may seriously reduce the insulation performance in severe cases.

[0048] Therefore, according toFigure 8A and 8B In the fifth preferred embodiment of the present invention shown in 8B , the present invention further proposes to provide an outer metal ring 9 on the outer side of the insulating layer 6. The outer metal ring 9 covers at least the radial outer surface of the insulating layer 6. Preferably, the axial width of the outer metal ring 9 may be slightly larger than the axial width of the insulating layer 6.

[0049] During the manufacturing process of such an insulating ferrule, for example, the outer metal ring 9 and the body 1 of the ferrule can be first placed in an injection mold, and then the material of the liquid insulating layer 6 is injected into the mold from an appropriate position. After the insulating layer 6 is molded, the outer metal ring 9 can be connected and cover the radial outer surface of the insulating layer 6, thereby forming an insulating ferrule with the outer metal ring 9. Of course, the outer metal ring 9 can also be connected and cover the radial outer surface of the insulating layer 6 by any other suitable means.

[0050] Since the outer metal ring 9 is a relatively rigid component, it is easier to control the dimensional accuracy, making it easier for the entire ferrule and even the entire bearing to meet the mating requirements with other components. Moreover, the outer metal ring 9 also provides good wear resistance and impact resistance.

[0051] Preferably, the inner surface (such as the radial inner circumferential surface) of the outer metal ring 9 may also include a knurled structure 90, and the insulating layer 6 is further embedded into the grooves (not marked) of the knurled structure 90 of the outer metal ring 9. Figure 8B Further shows that after the insulating layer 6 is molded, the outer metal ring 9 is removed to show the morphology of the part of the insulating layer 6 embedded in the knurled structure 90. This embedded connection between the knurled structure 90 and the insulating layer 6 can effectively prevent the radial relative movement between the outer metal ring 9 and the insulating layer 6.

[0052] Preferably, the outer metal ring 9 includes a flange 91 extending radially from its outer circumference, and the flange is embedded into the corner groove 61 of the insulating layer 6. By this arrangement, the axial relative movement between the outer metal ring 9 and the insulating layer 6 can be further prevented.

[0053] Although Figure 8A and Figure 8B are shown as adding the outer metal ring 9 on the basis of the third preferred embodiment shown in Figure 8B , it should be understood that according to other preferred embodiments not shown, the outer metal ring 9 can be applied to Figure 5 、 Figure 1 、 3 、the other preferred embodiments shown in 7, which will not be elaborated and shown here.

[0054] According to the above preferred embodiment of the present invention, the axial movement and / or circumferential movement of the insulating layer are restricted by providing "grooves" on the body of the ferrule, and the specific form and number of the grooves are not limited in any way. In other words, those skilled in the art can understand that the principle of the present invention is to remove some materials from the body of the ferrule and allow the molded insulating layer to enter the material-removed portions, thereby increasing the resistance to the axial movement and / or circumferential movement of the insulating layer.

[0055] Therefore, according to another variant of the present invention, as Figure 9 shown, a chamfered portion 54 is provided at the intersection between the outer peripheral surface 4 in the radial direction and the axial flange 5, and the insulating layer 6 can be molded in the chamfered portion 54. Thus, since the chamfered portion 54 is inclined with respect to the axial direction and the radial direction, it can also provide resistance to the axial movement of the insulating layer 6. This resistance effect is the same as that of the "grooves" (such as the corner groove 7) in the foregoing preferred embodiment (although the specific form of the chamfered portion 54 is different from that of the foregoing groove, both belong to the material-removed portions). Preferably, the knurling structure 80 as described above is further provided on the surface of the chamfered portion 54 to further provide restriction to the circumferential movement of the insulating layer 6.

[0056] In addition, Figure 9 the variant shown can also be combined with any of the foregoing preferred embodiments as required. For example, the chamfered portion 54 can be provided in the Figure 1-2 shown preferred embodiment, that is, the ferrule can include both the groove 51 and the chamfered portion 54 to provide a better effect of preventing the axial and circumferential movement of the insulating layer 6. Further preferably, the chamfered portion 54 can be provided as a continuous chamfered portion in the circumferential direction or a plurality of discontinuous chamfered portions

[0057] Furthermore, Figure 8A and 8B the outer metal ring 9 shown can be applied to the insulating layer 6 in the variant shown in Figure 9 , and details are not described herein again.

[0058] Finally, it should also be understood that according to different bearing structures, there is also a case where the axial end face 3 coincides with the axially outer end face 52 of the axial flange 5, or rather, the ferrule may not include the axially protruding axial flange 5, and only the axial end faces 3 are included on both sides of the body 1. In this case, the groove 51 in the first preferred embodiment may not exist, so that even if only Figure 3 , Figure 5 , Figure 7 , Figure 9In the embodiments, the material removal portions (such as grooves 53, 7, 41 or beveled portions 54) can also prevent the axial / circumferential movement of the insulating layer 6. For example, in an embodiment where the axial flange 5 is not shown, grooves such as groove 53 can be provided on the axial end face 3; corner grooves such as corner groove 7 can be provided at the intersection between the axial end face 3 and the radially outer peripheral face 4; beveled portions such as beveled portion 54 can be provided at the intersection between the axial end face 3 and the radially outer peripheral face 4.

[0059] In summary, the present invention proposes to provide material removal portions (such as various grooves or beveled portions) on the surface of the insulating ferrule body (i.e., on any suitable surface), as long as they can provide an obstructive effect on the axial movement / circumferential movement of the insulating layer. Further, according to the principle of the present invention, the above-mentioned knurling structure can also be understood as a form of material removal portion.

[0060] As mentioned above, in the insulating bearing of the present invention, the insulating layer is applied to the insulating ferrule by overmolding, and this process is usually completed by an injection molding machine. Refer to Figure 10 , generally speaking, if the gate of the injection molding machine is set to inject the insulating layer material axially and centrally from position A, the liquid insulating layer material will flow in the mold along all possible flow directions of the ferrule 1. From the circumferential direction, the liquid insulating layer material will converge at the dotted line position on the opposite side of the gate position A (i.e., the position symmetric about position A by about 180°) and form a weld line, that is, this weld line will be formed in the main force-bearing area of the ferrule. However, generally speaking, the strength of the weld line is poor, so when the weld line is formed in this main force-bearing area, it will have an adverse impact on the force and operation of the bearing, and may cause premature damage to the insulating layer itself.

[0061] Therefore, according to another aspect of the present invention, the present invention also provides a manufacturing method for an insulating bearing. This method mainly optimizes the gate position of the injection molding machine used for overmolding the insulating layer, so that the weld line of the overmolded insulating layer 6 avoids the main force-bearing area of the insulating ferrule and / or is formed at the position where the thickness of the insulating layer 6 is the largest.

[0062] For example, refer to Figure 11 (refer to the cross-sectional view of the third preferred embodiment) and Figure 1 , 3 5, 7, 9, according to the method of the present invention, the gate of the injection molding machine can be set at multiple positions: for example, the gate can be set to be roughly opposite to the inner peripheral surface 50 of the axial flange 5, as shown by arrow A, and this setting is more suitable for Figure 1 the first preferred embodiment; the gate can be set to be opposite to the axial outer end face 52 of the axial flange 5, as shown by arrow B, and this setting is more suitable for Figure 3the second preferred embodiment of Figure 8A and Figure 8B the fifth preferred embodiment of; the gate can be set to be opposite to the intersection between the radial outer peripheral surface 4 and the axial flange 5, as shown by arrow C. Such a setting is more suitable for Figure 5 the third preferred embodiment of Figure 7 the fourth preferred embodiment of and Figure 9 the modification of

[0063] Of course, it should be understood that although the preferred gate positions are proposed for different preferred embodiments above, this is not a limitation. According to actual needs, the above gate positions can also be used in other preferred embodiments; even according to actual needs, for a certain preferred embodiment, multiple positions can be selected from the above positions to set multiple gates.

[0064] Finally, although not shown, those skilled in the art can understand that the inner ring and the outer ring of the bearing are arranged on both sides of the rolling elements, and the inner ring has a structure substantially symmetrical to the outer ring. For example, the inner ring also includes a raceway, an axial end face, a radial outer peripheral surface (which is opposite to the inner ring raceway and usually faces the rotating shaft), etc. Therefore, the inner ring can similarly include various grooves in the above preferred embodiments for holding the insulating layer, and / or an outer metal ring that connects and covers the insulating layer of the inner ring (which can be in contact with the rotating shaft), which will not be elaborated here. That is to say, the "insulating ring" of the present invention can be the outer ring of the bearing or the inner ring of the bearing, as long as the principle of the present invention is implemented.

[0065] In summary, the present invention proposes an insulating bearing and a manufacturing method thereof for the problem of electrical corrosion of bearings in high-voltage environments. The present invention not only realizes good electrical insulation of the bearing, but also can further prevent the movement of the insulating layer along the axial direction and / or the circumferential direction, greatly improving the electrical performance and service life of the insulating layer and the entire bearing.

[0066] The exemplary embodiments of the present disclosure have been described in detail above with reference to the preferred embodiments. However, those skilled in the art can understand that, without departing from the concept of the present disclosure, various modifications and variations can be made to the above specific embodiments, and various combinations of the technical features and structures proposed by the present disclosure can be made, without exceeding the protection scope of the present disclosure. The protection scope of the present disclosure is determined by the appended claims.

Claims

1. An insulating bearing, comprising an outer ring, an inner ring, and rolling elements disposed between the outer ring and the inner ring, wherein, At least one of the outer ring and the inner ring is provided as an insulating ring, and the insulating ring includes a body (1), and the body (1) further includes: A raceway (2); An axial end face (3); A radial outer peripheral surface (4), which is arranged to face away from the raceway (2) in the radial direction; Wherein, a material removal portion is included on the surface of the body (1), and an insulating layer (6) is overmolded on the body (1) and molded into the material removal portion.

2. The insulated bearing according to claim 1, wherein, A groove serving as the material removal portion is included on the surface of the body (1), and the insulating layer (6) is overmolded on the body (1) and embedded into the groove.

3. The insulated bearing according to claim 2, wherein, The body (1) includes: An axial flange (5), which axially protrudes outward relative to the axial end face (3) and has a radial inner peripheral surface (50) facing the inner side of the bearing, and the radial inner peripheral surface (50) includes an inner radial groove (51) serving as the groove; Wherein, the insulating layer (6) is overmolded on the radial outer peripheral surface (4) and the axial flange (5), and the insulating layer (6) is embedded into the inner radial groove (51).

4. The insulating bearing according to claim 2 or 3, wherein, The body (1) includes an axial flange (5), which axially protrudes outward relative to the axial end face (3) and further includes an axial groove (53) serving as the groove provided on its axial outer end face (52), and the insulating layer (6) is embedded into the axial groove (53); Or The body (1) includes an axial groove serving as the groove provided on the axial end face (3), and the insulating layer (6) is embedded into the axial groove.

5. The insulating bearing according to any one of claims 1-4, wherein, The body (1) further includes a corner groove (7) serving as the groove provided at the intersection between the radial outer peripheral surface (4) and the axial flange (5), and the insulating layer (6) is embedded into the corner groove (7); or The body (1) further includes a corner groove serving as the groove provided at the intersection between the radial outer peripheral surface (4) and the axial end face (3), and the insulating layer (6) is embedded into the corner groove.

6. The insulated bearing according to any one of claims 2-5, wherein, The radial outer peripheral surface (4) further includes an outer radial groove (41) serving as the groove, and the insulating layer (6) is embedded into the outer radial groove (41); preferably, the outer radial groove (41) is arranged to be axially offset relative to the raceway symmetry plane (P).

7. The insulating bearing according to any one of claims 1-6, wherein, The body (1) includes an axial flange (5), which axially protrudes outward relative to the axial end face (3), and a chamfered portion (54) serving as the material removal portion at the intersection between the radial outer peripheral surface (4) and the axial flange (5); or The body (1) further includes a chamfered portion serving as the material removal portion provided at the intersection between the radial outer peripheral surface (4) and the axial end face (3).

8. The insulated bearing according to any one of claims 3-7, wherein, At least one of the inner radial groove (51), the axial groove (53), the corner groove (7), the outer radial groove (41) and the chamfered portion (54) includes a knurled structure (80), and the insulating layer (6) is embedded in the groove (81) of the knurled structure (80).

9. The insulated bearing according to any one of claims 3-7, wherein, At least one of the inner radial groove (51), the axial groove (53), the corner groove (7) and the outer radial groove (41) is provided as a continuous groove or a plurality of discontinuous grooves in the circumferential direction; The chamfered portion is provided as a continuous chamfered portion or a plurality of discontinuous chamfered portions in the circumferential direction.

10. The insulated bearing according to any one of claims 1-9, wherein, At least one of the outer peripheral surface (4), the axially outer end surface (52) of the axial flange (5) and the axial end surface (3) includes a knurled structure, and the insulating layer (6) is further embedded in the groove of the knurled structure.

11. The insulated bearing according to any one of claims 1-10, wherein the material of the insulating layer (6) includes one of the following: polyetheretherketone, polyphenylene sulfide, polyimide; preferably, the material of the insulating layer (6) is further added with reinforcing fibers to enhance the strength of the insulating layer (6); and / or the insulated bearing further includes an outer metal ring (9), and the outer metal ring at least connects to and covers the radially outer surface of the insulating layer (6); preferably, the inner surface of the outer metal ring includes a knurled structure (90), and the insulating layer (6) is further embedded in the groove of the knurled structure of the outer metal ring (9); preferably, the outer metal ring (9) includes a flange (91) extending radially from its outer circumference, and the flange is embedded in the corner groove (61) of the insulating layer (6); preferably, the thickness of the insulating layer (6) is set to be greater than or equal to 0.45 mm.

12. A method for manufacturing an insulated bearing according to any one of claims 1-11, comprising: setting the gate of an injection molding machine for overmolding the insulating layer so that the weld line of the overmolded insulating layer (6) avoids the main stress-bearing area of the insulating ring and / or is formed at the position where the thickness of the insulating layer (6) is the largest.

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