Electrocorrosion resistant insulated bearing and method of making same

Abstract

The application discloses a kind of electric corrosion resistant insulating bearings and preparation method thereof, including inner ring, outer ring and rolling body, the outer ring is set on inner ring and outer ring and inner ring are formed with the rolling cavity for the rolling body activity between, the outer ring is formed with insulating sleeve, the insulating sleeve is integrally formed by resin material and is covered to the outer peripheral wall of outer ring by injection molding process, fastener for the insulating sleeve is arranged on the insulating sleeve, the insulating sleeve is tightly connected with outer ring, further including preparation method, process as follows:1, outer ring preparation;2, outer ring is set knurled groove;3, outer ring heat treatment;4, outer ring injection molding forms insulating sleeve;5, install first preload ring and second preload ring;6, injection molding forms filling layer;7, grinding processing.The application solves the problem that there is no bearing with low preparation cost and meeting the demand of electric corrosion resistance in the prior art.

Description

Technical Field

[0001] This invention relates to the field of insulating bearing manufacturing technology, specifically to an electrically corrosion-resistant insulating bearing. Background Technology

[0002] With technological innovation and increasing production demands, bearings in equipment are required to be resistant to electro-corrosion under special operating conditions. However, existing technologies struggle to meet this requirement at a relatively low cost. One type of resistant bearing is the silicon nitride ceramic ball bearing. This product has a mature manufacturing process, large-scale production capabilities, and stable insulation performance, generating high resistance to address electro-corrosion caused by shaft voltage and current. However, the high cost of ceramic balls results in a high bearing price, making it uncompetitive in the cost-controlled automotive supply chain. Another type of resistant bearing utilizes ceramic coating technology to achieve electro-corrosion resistance on the bearing outer ring. This involves bonding a ceramic coating to the inner or outer diameter of the bearing. However, this technology is costly to manufacture and has low processing efficiency, hindering large-scale application and impacting production efficiency. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides an electro-corrosion resistant insulating bearing, which solves the problem of the lack of a bearing with low manufacturing cost, meeting the requirements for electro-corrosion resistance, and having a tight fit between the insulation layer and the outer ring.

[0004] To achieve the above objectives, the present invention provides an electro-corrosion resistant insulating bearing, comprising an inner ring, an outer ring, and rolling elements. The outer ring is fitted onto the inner ring, and a rolling cavity for the rolling elements to move is formed between the outer ring and the inner ring. An insulating sleeve is formed on the outer ring. The insulating sleeve is integrally molded from resin material and covers the outer peripheral wall of the outer ring by injection molding. Fasteners for tightly connecting the insulating sleeve and the outer ring are provided on the insulating sleeve.

[0005] The advantages of adopting the above technical solution are as follows: In the above technology, the insulating sleeve is integrally molded from resin material and applied to the outer peripheral wall of the outer ring through injection molding. This allows the insulating sleeve to wrap around the outer ring, isolating the bearing from the impact of large external currents, thus achieving electrical resistance. Simultaneously, the insulating sleeve provides corrosion resistance to the outer ring. The injection molding of the insulating sleeve from resin material in this technology results in high processing efficiency and reduced costs. While ensuring electrical and corrosion resistance, it reduces costs and increases production volume to meet demand. Furthermore, the fasteners enhance the connection strength between the insulating sleeve and the outer ring, thereby improving the bearing's service life and operational strength. The bearing in this technology can achieve a high-precision P5 level, and a reinforced cage can be installed in the rolling cavity. The reinforced cage wall thickness meets the strength requirements of high-speed bearing operation. Additionally, the rolling cavity stores high-speed, high-temperature performance grease to ensure bearing operation.

[0006] The present invention further provides that the insulating sleeve is prepared by injection molding and has a thickness ranging from 0.6 mm to 1.2 mm.

[0007] The advantages of adopting the above technical solution are: the insulation sleeve is prepared by injection molding with a thickness ranging from 0.6mm to 1.2mm, which ensures that the insulation sleeve has a certain insulation thickness to meet the requirements of special working conditions, while reducing the impact of excessive current on the bearing and meeting the bearing's electrical resistance and corrosion resistance requirements.

[0008] The present invention further comprises: knurled grooves are provided circumferentially on the outer peripheral wall and the two side walls of the outer ring; a fastening ring is provided on the insulating sleeve corresponding to each knurled groove; each fastening ring is tightly fitted with its corresponding knurled groove; and each fastening ring is integrally formed with the insulating sleeve by injection molding; the fastening ring is a fastener.

[0009] The advantages of adopting the above technical solution are: in the above technology, the fastening ring and the insulating sleeve are integrally formed by injection molding. That is, during the injection molding process, the insulating sleeve and the fastening ring in the knurled groove are simultaneously injection molded, and the insulating sleeve and the fastening ring are integrally formed, thereby improving the connection strength between the insulating sleeve and the fastening ring. At the same time, the fastening ring and the knurled groove cooperate to improve the connection strength between the insulating sleeve and the knurled groove, further improving the connection strength between the insulating sleeve and the outer ring. This avoids problems such as the insulating sleeve detaching from the outer ring or shaking or shifting when the bearing is running at high speed, thereby improving the bearing's operating efficiency and service life.

[0010] The present invention further comprises: each of the fastening rings having a circumferentially formed mounting groove, each mounting groove being connected to the surface of the insulating sleeve and forming a mounting notch; a first preload ring and a second preload ring being disposed opposite each other in the mounting groove; the inner circumferential walls of the first preload ring and the second preload ring being abutted against the bottom wall of the mounting groove; the inner sidewall of the first preload ring having a plurality of first bulges protruding toward the inner sidewall of the second preload ring; the inner sidewall of the second preload ring having a second bulge corresponding to each of the first bulges; each of the first bulges being partially abutted against its corresponding second bulge; both ends of the first bulges being smoothly curved and connected to the first preload ring; both ends of the second bulges being smoothly curved and connected to the second preload ring; both the first bulges and the second bulges being made of elastic material; and the outer sidewalls of the first preload ring and the second preload ring being abutted against the inner wall of the mounting groove.

[0011] The advantages of adopting the above technical solution are as follows: A first preload ring and a second preload ring are installed in the mounting groove. The first raised portion and the second raised portion abut against each other, causing the first raised portion and the second raised portion to deform under force. This force is transmitted to the first preload ring and the second preload ring respectively. The outer walls of the first preload ring and the second preload ring abut against each other with the inner wall of the mounting groove, so that the force acts on the inner walls of both sides of the mounting groove through the first preload ring and the second preload ring. The fastening ring is impacted by the force, causing the two side walls of the fastening ring to abut against the knurled groove respectively, thereby improving the fit strength between the fastening ring and the knurled groove, and thus improving the connection strength between the insulating sleeve and the outer ring.

[0012] The present invention further includes: a filling layer is injection molded into the mounting groove, and the material of the filling layer is the same as that of the insulating sleeve.

[0013] The advantages of adopting the above technical solution are: after the first preload ring and the second preload ring are filled, the insulating sleeve is subjected to secondary injection molding so that a filling layer is formed in the installation groove. The filling layer material is the same as the insulating sleeve material to meet the requirements of electrical resistance and corrosion resistance. The setting of the filling layer avoids the bearing operation from being affected.

[0014] The present invention further comprises: two annular limiting grooves are provided opposite to each other on the inner peripheral wall of each knurled groove; each fastening ring extends a limiting part corresponding to its adjacent annular limiting groove; each limiting part is configured to cooperate with its corresponding annular limiting groove; and the limiting part and the fastening ring are integrally formed.

[0015] The advantages of adopting the above technical solution are: the cooperation between the limiting part and the annular limiting groove in the above technology improves the connection strength between the insulating sleeve and the outer ring, and at the same time avoids the failure of the bearing's electrical and corrosion resistance due to axial displacement of the insulating sleeve. In the above technology, the limiting part and the fastening ring are integrally molded, that is, the fastening ring and the limiting part are injection molded simultaneously during injection molding, thereby improving the connection strength between the fastening ring and the limiting part.

[0016] Based on the above-mentioned electro-corrosion resistant insulating bearing, a method for preparing an electro-corrosion resistant insulating bearing is provided, including the following preparation process: S1. The outer ring is forged to produce the finished outer ring, and the outer ring is machined into a blank to produce the required non-grinding dimensions. S2. Based on the S1 process, the outer ring is processed to form several knurled grooves. Each knurled groove is then processed to form an annular limiting groove in each knurled groove. The knurled grooves are then polished. S3. Based on the S2 process, the outer ring is subjected to high-temperature heat treatment; S4. Based on the S3 process, install several detachable retaining rings on the heat-treated outer ring. Each detachable retaining ring is composed of two arc-shaped rings with a semi-circular radial cross section connected by a connecting pin. Each detachable retaining ring is placed in its corresponding knurled groove. Then, the outer ring is injection molded, and an insulating layer is formed on the outer peripheral wall and the two side walls of the outer ring. The three insulating layers are integrally formed to form an insulating sleeve. A fastening ring is formed on the inner peripheral wall of the insulating sleeve corresponding to each knurled groove position. Each fastening ring has a limiting part formed on its adjacent annular limiting groove position. The fastening ring and the insulating sleeve are integrally formed. S5. Based on the S4 process, the retaining ring is removed to form several installation notches on the surface of the insulation layer. The installation notches are the openings of the mounting groove facing the outside of the insulation layer. The thickness of the bottom wall of the mounting groove to the opening of the installation notch is less than the thickness of the retaining ring. S6. Based on the S5 process, a first preload ring and a second preload ring are installed in each mounting slot, so that the first preload ring and the second preload ring are opposite each other and each first protrusion is abutted against its corresponding second protrusion. The outer ring is then injected with a second time to fill the mounting slot and form a filling layer. S7. Based on the S6 process, the surfaces of the insulating sleeve and the filling layer are prepared by grinding.

[0017] The advantages of adopting the above technical solution are as follows: Before injection molding, a removable retaining ring is installed on each knurled groove. At this time, a gap is left between the inner circumferential wall of the removable retaining ring and the bottom wall of the knurled groove, and gaps are also left between the side walls of the removable retaining ring and the side walls of the knurled groove. These two gaps combine to form a filling groove for the injection molding liquid. During injection molding, the injection molding liquid fills the filling groove and covers the outer circumferential wall of the outer ring. After injection molding, a fastening ring is formed in the filling groove, and an insulating sleeve is formed on the outer circumferential wall of the outer ring. The insulating sleeve and the fastening ring are integrally formed, thereby improving the connection strength between the insulating sleeve and the outer ring during the initial injection molding. After completion, a first preload ring and a second preload ring are installed in each mounting slot, with the first raised portion abutting against the second raised portion. After the first and second preload rings are installed, the mounting slots are subjected to secondary injection molding to form a filling layer. After injection molding, the surfaces of the insulating sleeve and the filling layer are ground. After processing, the corresponding rolling elements, inner rings, and other parts are filled in until the bearing is assembled, thus completing the manufacturing process. The bearings manufactured through the above process have electrical and corrosion resistance. The entire bearing manufacturing process is highly efficient and low in cost, meeting the needs of mass production and usage conditions. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the present invention; Figure 2 for Figure 1 Enlarged view of part A in the middle; Figure 3 This is a three-dimensional view of the engagement state of the first preload ring and the second preload ring in this invention; Figure 4 A 3D view of the detachable retaining ring. Detailed Implementation

[0019] This invention provides an electro-corrosion resistant insulating bearing, comprising an inner ring 1, an outer ring 2, and rolling elements 11. The outer ring 2 is fitted onto the inner ring 1, and a rolling cavity for the rolling elements 11 is formed between the outer ring 2 and the inner ring 1. An insulating sleeve 3 is formed on the outer ring 2. The insulating sleeve 3 is integrally molded from resin material onto the outer peripheral wall of the outer ring 2 using an injection molding process. Fasteners are provided on the insulating sleeve 3 to ensure a tight connection between the insulating sleeve 3 and the outer ring 2. The thickness of the insulating sleeve 3, prepared by the injection molding process, ranges from 0.6 mm to 1.2 mm. Circumferential openings are provided on the outer peripheral wall and both side walls of the outer ring 2. The insulating sleeve 3 has a knurled groove 21, and a fastening ring 4 is provided at each knurled groove 21 position. Each fastening ring 4 is tightly fitted with its corresponding knurled groove 21. Each fastening ring 4 is integrally formed with the insulating sleeve 3 by injection molding. The fastening ring 4 is a fastener. Each fastening ring 4 has a circumferentially formed mounting groove 41. Each mounting groove 41 is connected to the surface of the insulating sleeve 3 and forms a mounting notch 411. A first preload ring 5 and a second preload ring 6 are arranged opposite each other in the mounting groove 41. The inner peripheral walls of the first preload ring 5 and the second preload ring 6 are... Both are configured to abut against the bottom wall of the mounting groove 41. The inner wall of the first preload ring 5 has several first raised portions 51 protruding towards the inner wall of the second preload ring 6. The inner wall of the second preload ring 6 has a second raised portion 61 corresponding to each of the first raised portions 51. Each first raised portion 51 partially abuts against its corresponding second raised portion 61. Both ends of the first raised portion 51 are smoothly curved and connected to the first preload ring 5. Both ends of the second raised portion 61 are smoothly curved and connected to the second preload ring 6. The raised portions 61 are all made of elastic material. The outer walls of the first preload ring 5 and the second preload ring 6 are both abutting against the inner wall of the mounting groove 41. The mounting groove 41 is injection molded with a filling layer 42. The filling layer 42 is made of the same material as the insulating sleeve 3. Each of the knurled grooves 21 has two annular limiting grooves 22 arranged opposite each other on its inner peripheral wall. Each of the fastening rings 4 extends a limiting portion 43 corresponding to its adjacent annular limiting groove 22. Each limiting portion 43 is matched with its corresponding annular limiting groove 22. The limiting portion 43 and the fastening ring 4 are integrally formed.

[0020] A method for preparing an electro-corrosion resistant insulating bearing, applicable to the electro-corrosion resistant insulating bearing according to any one of claims 1-6, comprises the following preparation process: S1. The outer ring 2 is forged to produce the finished outer ring 2. The outer ring 2 is then machined into a blank to produce the required non-grinding dimensions. S2. Based on the process of S1, the outer ring 2 is processed to form several knurled grooves 21. Each knurled groove 21 is processed to form an annular limiting groove 22 in each knurled groove 21. The knurled groove 21 is then polished. S3. Based on the S2 process, the outer ring 2 is subjected to high-temperature heat treatment; S4. Based on the S3 process, several detachable retaining rings are installed on the heat-treated outer ring 2. The detachable retaining rings are composed of two arc-shaped rings with a semi-circular radial cross section connected by connecting pins. Several detachable retaining rings are matched one-to-one with several knurled grooves 21, and each detachable retaining ring is placed in its corresponding knurled groove 21. Then, the outer ring 2 is injection molded, and an insulating layer is formed on the outer peripheral wall and the two side walls of the outer ring 2. The three insulating layers are integrally formed to form an insulating sleeve 3. A fastening ring 4 is formed on the inner peripheral wall of the insulating sleeve 3 corresponding to the position of each knurled groove 21. Each fastening ring 4 is formed with a limiting part 43 corresponding to the position of its adjacent annular limiting groove 22. The fastening ring 4 and the insulating sleeve 3 are integrally formed. S5. Based on the process of S4, the retaining ring is removed to form several installation notches 411 on the surface of the insulation layer. The installation notches are the openings of the mounting groove facing the outside of the insulation layer. The thickness from the bottom wall of the mounting groove 41 to the opening of the installation notch 411 is less than the thickness of the retaining ring. S6. Based on the process of S5, a first preload ring 5 and a second preload ring 6 are installed in each mounting groove 41, so that the first preload ring 5 and the second preload ring 6 are opposite each other and each first protrusion 51 is abutted against its corresponding second protrusion 61. The outer ring 2 is injected twice to fill the mounting groove 41 and form a filling layer 42. S7. Based on the S6 process, the surfaces of the insulating sleeve 3 and the filling layer 42 are prepared by grinding.

[0021] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A corrosion-resistant insulating bearing, comprising an inner ring, an outer ring, and rolling elements, wherein the outer ring is fitted onto the inner ring and a rolling cavity for the rolling elements to move is formed between the outer ring and the inner ring, characterized in that: An insulating sleeve is formed on the outer ring. The insulating sleeve is integrally molded from resin material onto the outer peripheral wall of the outer ring using an injection molding process. Fasteners are provided on the insulating sleeve to ensure a tight connection between the insulating sleeve and the outer ring. Knurled grooves are circumferentially formed on the outer peripheral wall and both side walls of the outer ring. A fastening ring is provided on the insulating sleeve corresponding to each knurled groove, and each fastening ring is tightly fitted to its corresponding knurled groove. Each fastening ring is integrally molded with the insulating sleeve using an injection molding process. Each fastening ring has a circumferentially formed mounting groove, and each mounting groove connects to the surface of the insulating sleeve and forms an mounting notch. A first preload ring and a second preload ring are positioned opposite each other within the mounting groove. The inner peripheral walls of the first and second preload rings are both abutting against the bottom wall of the mounting groove. The inner sidewall of the first preload ring has several first raised portions protruding towards the inner sidewall of the second preload ring. The inner sidewall of the second preload ring has a second raised portion corresponding to each of the first raised portions. Each first raised portion is partially abutting against its corresponding second raised portion. Both ends of the first raised portion are smoothly curved and connected to the first preload ring. Both ends of the second raised portion are smoothly curved and connected to the second preload ring. Both the first and second raised portions are made of elastic material. The outer sidewalls of the first and second preload rings are abutting against the inner wall of the mounting groove.

2. The electro-corrosion resistant insulating bearing according to claim 1, characterized in that: The insulating sleeve is manufactured by injection molding and has a thickness ranging from 0.6 mm to 1.2 mm.

3. The electro-corrosion resistant insulating bearing according to claim 1, characterized in that: The mounting groove is injection molded with a filler layer, and the filler layer is made of the same material as the insulating sleeve.

4. The electro-corrosion resistant insulating bearing according to claim 1, characterized in that: Two annular limiting grooves are provided opposite each other on the inner peripheral wall of each of the knurled grooves. Each of the fastening rings has a limiting part extending from its adjacent annular limiting groove. Each limiting part is configured to cooperate with its corresponding annular limiting groove. The limiting part and the fastening ring are integrally formed.

5. A method for preparing an electro-corrosion resistant insulating bearing, applied to the electro-corrosion resistant insulating bearing according to any one of claims 1-4, characterized in that: The preparation process includes the following: S1. The outer ring is forged to produce the finished outer ring, and the outer ring is machined into a blank to produce the required non-grinding dimensions. S2. Based on the S1 process, the outer ring is processed to form several knurled grooves. Each knurled groove is then processed to form an annular limiting groove in each knurled groove. The knurled grooves are then polished. S3. Based on the S2 process, the outer ring is subjected to high-temperature heat treatment; S4. Based on the S3 process, install several detachable retaining rings on the heat-treated outer ring. Each detachable retaining ring is composed of two arc-shaped rings with a semi-circular radial cross section connected by a connecting pin. Each detachable retaining ring is placed in its corresponding knurled groove. Then, the outer ring is injection molded, and an insulating layer is formed on the outer peripheral wall and the two side walls of the outer ring. The three insulating layers are integrally formed to form an insulating sleeve. A fastening ring is formed on the inner peripheral wall of the insulating sleeve corresponding to each knurled groove position. Each fastening ring has a limiting part formed on its adjacent annular limiting groove position. The fastening ring and the insulating sleeve are integrally formed. S5. Based on the S4 process, the retaining ring is removed to form several installation notches on the surface of the insulation layer. The installation notches are the openings of the mounting groove facing the outside of the insulation layer. The thickness of the bottom wall of the mounting groove to the opening of the installation notch is less than the thickness of the retaining ring. S6. Based on the S5 process, a first preload ring and a second preload ring are installed in each mounting slot, so that the first preload ring and the second preload ring are opposite each other and each first protrusion is abutted against its corresponding second protrusion. The outer ring is then injected with a second time to fill the mounting slot and form a filling layer. S7. Based on the S6 process, the surfaces of the insulating sleeve and the filling layer are prepared by grinding.

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