Electric corrosion prevention bearing

Abstract

An embodiment of the present invention provides an electric corrosion prevention bearing having an insulation molding unit. According to an embodiment of the present invention, the electric corrosion prevention bearing comprises: an inner ring having outer circumferential surface on which an inner track surface for rolling elements is formed; an outer ring having on an inner circumferential surface on which an outer track surface for the rolling elements is formed; multiple rolling elements positioned between the inner ring and the outer ring; a cage accommodating and supporting the rolling elements; and an insulation molding unit formed in contact with the outer ring. According to an embodiment of the present invention, a recess having a recessed structure may be provided in a portion of a surface of the outer ring in contact with the insulation molding unit, and the insulation molding part may include a coupling protrusion accommodated in and coupled to the recess.

Description

Anti-corrosion bearings

[0001] The present invention relates to a bearing that supports a rotating element in a rotating device so as to be able to rotate relative to a non-rotating element, and more specifically, to a bearing configured to prevent the occurrence of electric corrosion by forming an insulating molding part on an outer ring and / or an inner ring.

[0002] A bearing is a device installed between a rotating element and a non-rotating element in a rotating device to assist relative motion between the rotating element and the non-rotating element. Depending on the method of contact between the bearing and the shaft, it can be classified into a sliding bearing and a rolling bearing.

[0003] Among these, cloud bearings can perform the function of supporting a rotating shaft using rolling elements such as balls or rollers, and have the advantage of lower frictional resistance compared to sliding bearings, so they are used in various fields.

[0004] A rolling bearing can generally be configured such that the inner ring and outer ring are connected to each other so as to be able to rotate relative to each other through a rolling element, and the inner ring, outer ring, and rolling element that constitute the rolling bearing are generally formed of a steel series metal.

[0005] However, when these cloud bearings are used in a rotating device that uses an electric motor or the like as a driving source, electric current may flow into the bearing, causing electric corrosion in the bearing parts, which may result in damage to the bearing parts.

[0006] To prevent such corrosion problems, a method has been proposed to secure insulation by forming the rolling elements of the bearing out of ceramic material or by forming a film layer on the inner and / or outer rings of the bearing.

[0007] However, the rolling element formed of ceramic material is very expensive and has low durability, and the method of forming a film layer on the inner ring and / or outer ring requires time and money for the film process, and the film layer can easily peel off, causing corrosion to occur through the peeled part.

[0008] The present invention is intended to solve the above-mentioned conventional problems, and aims to provide a bearing configured to prevent the occurrence of galvanic corrosion by forming an insulating molding part on the outer ring and / or the inner ring.

[0009] A representative configuration of the present invention to achieve the aforementioned purpose is as follows.

[0010] According to one embodiment of the present invention, an anti-corrosion bearing having an insulating molding part is provided. The anti-corrosion bearing according to one embodiment of the present invention may include: an inner ring having an inner raceway surface of rolling elements formed on an outer circumferential surface; an outer ring having an outer raceway surface of rolling elements formed on an inner circumferential surface; a plurality of rolling elements positioned between the inner ring and the outer ring; a cage accommodating and supporting the rolling elements; and an insulating molding part formed in contact with the outer ring. According to one embodiment of the present invention, a recess having a sunken structure may be provided on a portion of a surface of the outer ring with which the insulating molding part comes into contact, and the insulating molding part may be provided with a coupling protrusion accommodated and coupled within the recess.

[0011] According to one embodiment of the present invention, a protrusion formed to extend in the axial direction may be provided on the radially outer side of the recess.

[0012] According to one embodiment of the present invention, the axial end of the protrusion may be located axially inward relative to the axial cross-section of the outer ring.

[0013] According to one embodiment of the present invention, the insulating molding portion may be formed to surround all or part of the outer circumferential surface and the shaft cross-section of the outer ring.

[0014] According to one embodiment of the present invention, the recess can be formed at a corner portion between the outer surface of the outer ring and the shaft cross-section.

[0015] According to one embodiment of the present invention, the insulating molding part may further have a coupling groove that is axially recessed on the radially outer side of the coupling protrusion.

[0016] According to one embodiment of the present invention, an anti-corrosion bearing having an insulating molding part is provided. The anti-corrosion bearing according to one embodiment of the present invention may include: an inner ring having an inner raceway surface of rolling elements formed on an outer circumferential surface; an outer ring having an outer raceway surface of rolling elements formed on an inner circumferential surface; a plurality of rolling elements positioned between the inner ring and the outer ring; a cage accommodating and supporting the rolling elements; and an insulating molding part formed in contact with the inner ring. According to one embodiment of the present invention, a recess having a sunken structure may be provided on a portion of a surface of the inner ring with which the insulating molding part comes into contact, and the insulating molding part may be provided with a coupling protrusion that is received and coupled within the recess.

[0017] According to one embodiment of the present invention, a protrusion formed to extend axially may be provided on the radially inner side of the recess.

[0018] According to one embodiment of the present invention, the axial end of the protrusion may be located axially inward relative to the axial cross-section of the inner ring.

[0019] According to one embodiment of the present invention, the insulating molding portion can be formed to surround all or part of the inner circumferential surface and the shaft cross-section of the inner ring.

[0020] According to one embodiment of the present invention, the recess can be formed at a corner portion between the inner surface of the inner ring and the shaft cross-section.

[0021] According to one embodiment of the present invention, the insulating molding part may further have a joining groove that is sunken axially outward on the radially inner side of the joining projection.

[0022] According to one embodiment of the present invention, the insulating molding portion can be formed by injection molding a plastic material.

[0023] According to one embodiment of the present invention, the recesses and the engaging protrusions may be provided in multiple numbers spaced apart along the circumferential direction.

[0024] According to one embodiment of the present invention, the recesses and the engaging protrusions may be provided in plurality at equal intervals along the circumferential direction.

[0025] In addition, the anti-corrosion bearing according to the present invention may further include other additional components within a range that does not impair the technical idea of ​​the present invention.

[0026] Since the anti-corrosion bearing according to one embodiment of the present invention is configured to have an insulating molding part on the outer ring and / or the inner ring, it is possible to prevent electric corrosion from occurring on the bearing parts even when used in a rotating device that uses an electric motor or the like as a driving source.

[0027] In addition, since the corrosion-preventing bearing according to one embodiment of the present invention has a corrosion-preventing structure formed by an insulating molding part made of a plastic material, the corrosion-preventing structure can be formed more easily and stably on one side of the outer ring and / or the inner ring through a process such as injection molding.

[0028] In addition, since the anti-corrosion bearing according to one embodiment of the present invention is configured such that the engaging projection of the insulating molding part is inserted into and engaged with a recess provided in the outer ring and / or the inner ring, slip (circumferential relative movement) between the insulating molding part and the outer ring and / or the inner ring can be prevented from occurring due to the engaging engagement between the engaging projection and the recess, and thus the anti-corrosion function by the insulating molding part can be more stably secured.

[0029] In addition, the anti-corrosion bearing according to one embodiment of the present invention is configured such that a protrusion extending axially on the radially outer or inner portion of the recess is provided so that a coupling protrusion of the insulating molding part is radially hooked to the protrusion, thereby preventing the insulating molding part from being lifted and separated from the outer ring and / or inner ring due to expansion of the plastic insulating molding part, thereby more stably securing the anti-corrosion function by the insulating molding part.

[0030] FIG. 1 illustrates an example of a corrosion-preventing bearing according to one embodiment of the present invention.

[0031] Fig. 2 illustrates an example of a bearing with an insulating molding part omitted from the anti-corrosion bearing illustrated in Fig. 1.

[0032] Figure 3 illustrates an enlarged view of part A of Figure 2 (a recessed part formed in the outer ring).

[0033] Fig. 4 illustrates an example of a cross-sectional structure of the anti-corrosion bearing illustrated in Fig. 1.

[0034] FIG. 5 illustrates an example of a corrosion-preventing bearing according to another embodiment of the present invention.

[0035] <Explanation of symbols>

[0036] 100: Anti-corrosion bearing

[0037] 200: Inner ring

[0038] 210: Inner orbital surface

[0039] 220: (Inner ring) inner circumference

[0040] 230: (Inner ring) shaft cross section

[0041] 300: Outer ring

[0042] 310: Outer orbital surface

[0043] 320: (outer ring) outer surface

[0044] 330: (Outer ring) axial cross-section

[0045] 340: (outer ring) corner

[0046] 400: Electric body

[0047] 500: Cage

[0048] 600: Insulating molding part

[0049] 610: Radial cover

[0050] 620: Axial cover

[0051] 630: Combination protrusion

[0052] 640: Combination Home

[0053] 700: Recess

[0054] 710: Radial floor surface

[0055] 720: Axial bottom surface

[0056] 730: Circular side

[0057] 740: Protrusion

[0058] The embodiments described below are provided for the purpose of explaining the technical idea of ​​the present invention, and the scope of the present invention is not limited to the embodiments presented below or the specific description thereof.

[0059] All technical and scientific terms used in this specification have the meaning commonly understood by a person of ordinary skill in the art to which the present invention pertains unless otherwise defined, and all terms used in this specification have been selected for the purpose of more clearly explaining the present invention and have not been selected to limit the scope of the rights of the present invention.

[0060] As used herein, expressions such as “including,” “comprising,” “having,” etc. should be understood as open-ended terms implying the possibility of including other embodiments, unless otherwise stated in the phrase or sentence in which the expression is included.

[0061] In this specification, “axial” means a direction extending along the rotational center axis of the bearing (“axially inward” means a direction from the outside toward the center of the rolling element, and “axially outward” means a direction away from the center of the rolling element), “radial” means a direction perpendicular to this “axial direction” away from or closer to the rotational center axis, and “circumferential” means a direction of rotation centered on the aforementioned “axial direction.”

[0062] Where a component is described herein as extending axially or radially, it should be understood that this may include extending not only parallel to the axial or radial direction, but also obliquely to the axial or radial direction, unless otherwise stated in the phrase or sentence containing the expression.

[0063] The singular forms used in this specification may include plural meanings unless otherwise stated, and the same applies to the singular forms used in the claims.

[0064] When a component is referred to herein as being “positioned” or “formed” on one side of another component, it should be understood that the component is positioned or formed in direct contact with one side of the other component, or may be positioned or formed with another new component interposed therebetween.

[0065] Hereinafter, with reference to the attached drawings, preferred embodiments of the present invention will be described in detail to a degree that those skilled in the art can easily practice the present invention. In the attached drawings, identical or corresponding components are indicated by the same reference numerals, and in the description of the embodiments below, redundant description of identical or corresponding components may be omitted. However, even if a description of a specific component is omitted in the description below, this is not intended to mean that such component is not included in the corresponding embodiment.

[0066] Referring to FIGS. 1 to 5, an anti-corrosion bearing (100) according to one embodiment of the present invention is exemplarily illustrated.

[0067] As shown in the drawing, the anti-corrosion bearing (100) according to one embodiment of the present invention can be configured such that the inner ring (200) and the outer ring (300) are connected to each other so as to be able to rotate relative to each other through a plurality of rolling elements (400), similar to a conventional rolling bearing.

[0068] According to one embodiment of the present invention, a corrosion-preventing bearing (100) may include an inner ring (200) having an inner raceway surface of a rolling element formed on an outer circumferential surface; an outer ring (300) having an outer raceway surface of a rolling element formed on an inner circumferential surface; a plurality of rolling elements (400) positioned between the inner ring (200) and the outer ring (300); and a cage (500) that accommodates and supports the rolling elements (400).

[0069] According to one embodiment of the present invention, the inner ring (200) may be configured to be mounted by being pressed into the outer surface of the rotating shaft, and may be configured to support the rolling element (400) radially inwardly through a track surface (inner track surface (210) of the rolling element) formed on the outer surface.

[0070] According to one embodiment of the present invention, the outer ring (300) may be configured to be positioned radially outside the inner ring (200) and mounted by being press-fitted into a housing or the like, and may be configured to support the electric element (400) from the radially outside through a raceway surface (outer raceway surface (310) of the electric element) formed on the inner circumferential surface.

[0071] According to one embodiment of the present invention, the driving element (400) is arranged between the inner raceway surface (210) formed on the inner ring (200) and the outer raceway surface (310) formed on the outer ring (300) to perform a function of connecting the inner ring (200) and the outer ring (300) so as to be able to rotate relative to each other, and may be configured to be accommodated in a cage (500) so that a plurality of driving elements (400) are arranged spaced apart from each other at a predetermined interval in the circumferential direction.

[0072] According to one embodiment of the present invention, at least one of the inner ring (200) and the outer ring (300) of the corrosion-preventing bearing (100) may be configured to be provided with an insulating molding portion (600) for corrosion prevention.

[0073] According to one embodiment of the present invention, the insulating molding part (600) can be configured to be formed by being attached to one side of the outer ring (300) as in the embodiments illustrated in FIGS. 1 to 4.

[0074] According to one embodiment of the present invention, the insulating molding portion (600) may be formed of an insulating material such as plastic, and may be configured to be integrally attached to the outer ring (300) through injection molding (e.g., over mold injection molding).

[0075] According to one embodiment of the present invention, the insulating molding portion (600) may be formed to surround all or part of the outer circumferential surface (320) and the shaft cross-section (330) of the outer ring (300).

[0076] For example, the insulating molding part (600) may be configured to have a radial cover part (610) that surrounds the outer circumference (320) of the outer ring (300) as shown in the drawing, and an axial cover part (620) that surrounds the axial cross-section (330) of the outer ring (300), so that the outer circumference (320) of the outer ring (300) is entirely surrounded by the radial cover part (610) and the axial cover parts (620) partially surround the axial cross-sections (330) on both sides of the outer ring (300).

[0077] According to one embodiment of the present invention, a recess (700) having a sunken structure may be provided on a portion of the surface of the outer ring (300) where the insulating molding part (600) comes into contact, and the engaging protrusion (630) of the insulating molding part (600) may be configured to be received and engaged in the recess (700).

[0078] According to one embodiment of the present invention, the recess (700) may be configured to be formed at a corner portion (340) between the outer circumferential surface (320) and the shaft cross-section (330) of the outer ring (300) as in the illustrated embodiment.

[0079] For example, the corner portion (340) between the outer surface (320) of the outer ring (300) and the shaft cross-section (330) may be formed to have a rounded or chamfered structure, and the recess (700) may be configured to be formed in the corner portion (340) of this rounded or chamfered structure.

[0080] According to one embodiment of the present invention, the recess (700) may be configured to be provided at all corners (340) of the axial ends of the outer ring (300) on both sides as in the illustrated embodiment, or may be configured to be provided at only the corners (340) of one end.

[0081] According to one embodiment of the present invention, the recesses (700) may be provided in multiple numbers spaced apart along the circumferential direction, and preferably may be configured to be provided in multiple numbers spaced apart at equal intervals along the circumferential direction.

[0082] According to one embodiment of the present invention, the recess (700) may be formed in a sunken structure from the outer surface of the outer ring (300) and configured to have a bottom surface and a circumferential side surface.

[0083] For example, according to one embodiment of the present invention, the recess (700) may be formed with a structure including a radial bottom surface (710), an axial bottom surface (720), and circumferential side surfaces (730) as shown in the drawing.

[0084] According to one embodiment of the present invention, the radially outer portion of the recess (700) may be configured to have a protrusion (740) formed to extend in the axial direction.

[0085] According to one embodiment of the present invention, the protrusion (740) may be configured such that its axial end is positioned axially inward relative to the axial cross-section (330) of the outer ring (300). [The axial end of the protrusion (740) is positioned axially closer to the center of the rolling element (400) than the axial cross-section (330) of the outer ring (300).]

[0086] According to one embodiment of the present invention, the axial end of the protrusion (740) may be configured to be located between the axial end face (330) of the outer ring (300) and the axial bottom face (720) of the recess (700).

[0087] According to one embodiment of the present invention, the insulating molding part (600) may further have a coupling groove (640) that is axially recessed in the radially outer portion of the coupling protrusion (630).

[0088] According to one embodiment of the present invention, the coupling protrusion (630) of the insulating molding part (600) may be configured to be inserted into and coupled to the aforementioned recess (700), and the aforementioned protrusion (740) may be configured to be inserted into and coupled to the coupling groove (640) of the insulating molding part (600).

[0089] Meanwhile, the electrolytic corrosion prevention bearing (100) of the embodiment described above (the embodiment illustrated in FIGS. 1 to 4) is configured with a structure in which an insulating molding part (600) is formed on the outer ring (300), but the electrolytic corrosion prevention bearing (100) according to one embodiment of the present invention may be implemented by modifying the structure in which the insulating molding part (600) is formed on the inner ring (200) instead of the outer ring (300), as illustrated in FIG. 5.

[0090] For example, the insulating molding portion (600) may be configured to at least partially surround the inner circumferential surface (220) and the shaft cross-section (230) of the inner ring (200) as illustrated in FIG. 5 to prevent corrosion.

[0091] In the embodiment illustrated in FIG. 5, the structure between the inner ring (200) and the insulating molding part (600) can be implemented in a manner substantially identical or similar to that of the previous embodiment, and a detailed description thereof is omitted below, and the corresponding components of the previous embodiment are indicated with the same drawing reference numerals in FIG. 5.

[0092] In addition, although not shown in the drawing, the insulating molding part (600) may be configured to be provided on both the inner ring (200) and the outer ring (300), and in the case of this embodiment, the structure of the inner ring (200), the outer ring (300) and the insulating molding part (600) attached thereto may be implemented in a manner substantially identical or similar to the embodiment described above.

[0093] Meanwhile, in the embodiments of the drawings, the corrosion prevention bearing (100) is formed with a structure in which the insulating molding portion (600) is formed only on one side of the outer ring (300) and the inner ring (200), but the corrosion prevention bearing (100) according to one embodiment of the present invention is not limited to this structure and may be modified to be formed so that the insulating molding portion (600) is provided on both sides of the outer ring (300) and the inner ring (200).

[0094] In this way, since the corrosion-preventing bearing (100) according to one embodiment of the present invention is formed with a structure in which an insulating molding part (600) is attached to the outer ring (300) and / or the inner ring (200), it is possible to prevent corrosion from occurring in the bearing parts even when used in a rotating device that uses an electric motor or the like as a driving source.

[0095] In addition, since the corrosion-preventing bearing (100) according to one embodiment of the present invention has a corrosion-preventing structure formed of an insulating molding part (600) made of a plastic material, the corrosion-preventing structure can be easily and stably formed on one side of the outer ring (300) and / or the inner ring (200) through injection molding or the like.

[0096] In addition, since the anti-corrosion bearing (100) according to one embodiment of the present invention is configured such that the engaging projection (630) of the insulating molding part (600) is inserted into and engaged with the recess (700) provided in the outer ring (300) and / or the inner ring (200), it is possible to prevent slip (circumferential relative movement) from occurring between the engaging projection (630) and the recess (700), and thus the anti-corrosion function by the insulating molding part (600) can be more stably secured.

[0097] In addition, the anti-corrosion bearing (100) according to one embodiment of the present invention is configured such that a protrusion (740) extending axially on the radially outer or inner portion of the recess (700) is provided so that the engaging projection (630) of the insulating molding part (600) is radially hooked to the protrusion (740), thereby preventing the insulating molding part (630) from being lifted away from the outer ring (300) and / or the inner ring (200) due to expansion of the plastic insulating molding part (600), and thereby the anti-corrosion function by the insulating molding part (600) can be more stably secured.

[0098] Specifically, since plastic has a higher coefficient of thermal expansion than carbon steel (bearing steel) forming the inner ring (200) and outer ring (300) of the bearing (plastic has a coefficient of thermal expansion that is approximately 3 to 4 times greater than that of bearing steel), the insulating molding portion (600) may expand relatively more than the outer ring (300) and / or the inner ring (200) due to temperature rise caused by bearing rotation, and may cause a problem of being lifted and separated radially from the outer ring (300) and / or the inner ring (200). However, the corrosion prevention bearing (100) according to one embodiment of the present invention can prevent this problem by a radial engaging engagement between the engaging projection (630) and the protrusion (740).

[0099] Although the present invention has been described above with specific details such as specific components and limited examples, the above examples are provided only to help a more general understanding of the present invention, and the present invention is not limited thereto, and those with ordinary knowledge in the technical field to which the present invention pertains can make various modifications and variations based on this description.

[0100] Therefore, the idea of ​​the present invention should not be limited to the embodiments described above, and all things that are modified equally or equivalently to the claims described below as well as the claims are considered to fall within the scope of the idea of ​​the present invention.

Claims

1. An inner ring (200) having an inner raceway surface of a rolling element formed on the outer surface; An outer ring (300) having an outer raceway surface of a driving body formed on its inner surface; A plurality of electric motors (400) positioned between the inner ring (200) and the outer ring (300); A cage (500) that accommodates and supports the above-mentioned electric body (400); Including an insulating molding part (600) formed by contacting the outer ring (300); A recess (700) of a sunken structure is provided on a part of the surface of the outer ring (300) that comes into contact with the insulating molding part (600). The above insulating molding part (600) is provided with a joining projection (630) that is received and joined within the recess (700). Anti-slip bearings.

2. In paragraph 1, A protrusion (740) formed to extend axially is provided on the radially outer side of the above recess (700). Anti-slip bearings.

3. In paragraph 2, The axial end of the above protrusion (740) is located axially inner than the axial cross-section (330) of the outer ring (300). Anti-slip bearings.

4. In paragraph 3, The above insulating molding part (600) is formed to surround all or part of the outer surface (320) and the shaft cross-section (330) of the outer ring (300). Anti-slip bearings.

5. In paragraph 4, The above recess (700) is formed at the corner (340) between the outer surface (320) of the outer ring (300) and the shaft cross-section (330). Anti-slip bearings.

6. In paragraph 5, The above insulating molding part (600) further has a joining groove (640) that is axially sunken in the radial outer side of the joining projection (630). Anti-slip bearings.

7. An inner ring (200) having an inner raceway surface of a rolling element formed on the outer surface; An outer ring (300) having an outer raceway surface of a driving body formed on its inner surface; A plurality of electric motors (400) positioned between the inner ring (200) and the outer ring (300); A cage (500) that accommodates and supports the above-mentioned electric body (400); Including an insulating molding part (600) formed by contacting the inner ring (200); A recess (700) of a sunken structure is provided on a part of the surface of the inner ring (200) that comes into contact with the insulating molding part (600). The above insulating molding part (600) is provided with a joining projection (630) that is received and joined within the recess (700). Anti-slip bearings.

8. In paragraph 7, A protrusion (740) formed to extend axially is provided on the radially inner side of the above recess (700). Anti-slip bearings.

9. In paragraph 8, The axial end of the above protrusion (740) is located axially inner than the axial cross-section (230) of the inner ring (200). Anti-slip bearings.

10. In paragraph 9, The above insulating molding part (600) is formed to surround all or part of the inner surface (220) and the shaft cross-section (230) of the inner ring (200). Anti-slip bearings.

11. In paragraph 10, The above recess (700) is formed at the corner between the inner surface (220) of the inner ring (200) and the shaft cross-section (230). Anti-slip bearings.

12. In paragraph 11, The above insulating molding part (600) further has a joining groove (640) that is sunken axially outward on the radial inner side of the joining projection (630). Anti-slip bearings.

13. In any one of paragraphs 1 to 12, The above insulating molding part (600) is formed by injection molding a plastic material. Anti-slip bearings.

14. In paragraph 13, The above recess (700) and the above coupling protrusion (630) are provided in multiple numbers spaced apart along the circumferential direction. Anti-slip bearings.

15. In paragraph 14, The above recess (700) and the above coupling protrusion (630) are provided in multiple numbers at equal intervals along the circumferential direction. Anti-slip bearings.

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