Rolling bearing ring unit and method for producing a rolling bearing ring unit
By fixing electrically insulating elements on the bearing ring and setting a distance greater than half the maximum diameter of the raceway between the imaginary half-planes, combined with L-shaped bushings and mold forming, the problems of current damage to bearing steel and mold damage are solved, and high-quality rolling bearing ring units are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- AB SKF SKF PATENT DEPARTMENT
- Filing Date
- 2025-12-05
- Publication Date
- 2026-06-16
AI Technical Summary
In the prior art, current may damage the bearing steel when it flows through the bearing steel, and during the production process of the rolling bearing ring unit, the force applied by the mold may cause damage to the bearing ring and raceway.
An electrical insulating element is fixed on the bearing ring such that the distance between the imaginary half-planes is greater than half the maximum diameter of the raceway. The electrical insulating element is fixed by molding, avoiding direct contact between the mold and the raceway and the bearing ring. An L-shaped bushing is used for fixing. The injection molding compound is injected into the face side of the bearing ring.
It provides high-quality rolling bearing ring units with long service life, avoids damage to the bearing ring and raceway by the mold, and achieves safe electrical insulation of the bearing ring and easy assembly.
Smart Images
Figure CN122216249A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a rolling bearing ring unit and a method (process) for producing the rolling bearing ring unit. Background Technology
[0002] In particular, in electric vehicle applications, current flowing through the bearing steel can damage it. This problem can be solved by using an isolating layer / component. Known deep groove ball bearings include an isolating layer on the outer ring. The isolating layer is fixed to the radially outer surface of the outer ring. Furthermore, the isolating layer comprises a hollow cylinder with radially inward protrusions at its axial ends. A bushing is located on the radially outer surface of the isolating layer. The bushing consists of one or two components having an L-shape in its axial section. Generally, the bushing also has the form of a hollow cylinder with radially inward protrusions at both axial ends. The axial ends of the bushing abut against the housing portion and against the fixing ring. Summary of the Invention
[0003] The problem addressed by this invention is particularly to provide a rolling bearing ring unit with a long service life and high quality. According to the invention, this problem is solved by the features of technical solution 1, technical solution 2, technical solution 8, and technical solution 9, while advantageous embodiments of the invention are highlighted in the dependent claims.
[0004] The present invention begins with a rolling bearing ring unit having at least one bearing ring and at least one electrically insulating element fixed to the bearing ring, the bearing ring being an outer ring and including at least one raceway.
[0005] The proposal proposes the existence of a first imaginary half-plane and a second imaginary half-plane. The first imaginary half-plane is defined by the central axis of the bearing ring, and the second imaginary half-plane is also defined by the central axis and differs from the first half-plane, such that the distance from the central axis to all parts of the insulating element located between the half-planes is greater than half the maximum diameter of the raceway. The "distance" of an object from the axis should be specifically understood as the minimum distance between all geometric points of the object and the axis. A "half-plane" should be specifically understood as one of two regions into which a plane is divided by a straight line that is part of the plane. The fact that a half-plane is "defined" by a straight line should be specifically understood as meaning that the half-plane is one of two regions into which the plane is divided by a straight line. The "central axis" of the bearing ring should be specifically understood as a straight line in the axial direction of the bearing ring that includes the center of mass of the bearing ring. In this way, rolling bearing ring units with long service life and high quality can be provided. In particular, during the production method of the rolling bearing ring unit, it is possible to avoid the mold ( / mold form) applying force to the bearing ring, which could cause damage to the bearing ring and / or raceway.
[0006] Furthermore, a rolling bearing ring unit is proposed, comprising at least one bearing ring and at least one electrically insulating element fixed to the bearing ring. The bearing ring is an inner ring and includes at least one raceway. A first imaginary half-plane and a second imaginary half-plane exist, the first imaginary half-plane being defined by the central axis of the bearing ring, and the second imaginary half-plane also being defined by the central axis and differing from the first half-plane, such that the distance of the raceway from the central axis is greater than the maximum radius of everything of the insulating element located between the half-planes, measured relative to the central axis. In this manner, a high-quality rolling bearing ring unit can be provided.
[0007] In particular, during the production method of the rolling bearing ring unit, it is possible to avoid the mold ( / mold form) applying force to the bearing ring, which could lead to damage to the bearing ring and / or raceway.
[0008] Advantageously, the electrical insulating element is directly fixed to the bearing race on at least two sides. This allows for safe electrical insulation of the bearing race.
[0009] Advantageously, the electrical insulating element includes a radially inner or radially outer surface that does not contact the bearing ring and includes at least one projection. This allows for simplified production of the insulating element. In particular, during the production of the insulating element, the injection point for the injection molding compound can be located at the projection.
[0010] Furthermore, it is suggested that the rolling bearing ring unit includes at least one bushing, which is fixed to the electrical insulating element and includes at least one part. In this way, good fixation of the bearing ring and easy assembly of the bearing ring can be achieved.
[0011] Specifically, the bushing is composed of two parts, each having an L-shape in its axial cross-section. In this way, the rolling bearing ring unit can include electrically insulated axially abutting surfaces.
[0012] Furthermore, it is proposed that at least two components of the bushing are structurally identical. This enables cost-effective production.
[0013] Additionally, a method for producing rolling bearing ring units (particularly rolling bearing ring units as described so far) is proposed, the rolling bearing ring unit having at least one bearing ring, the bearing ring being an outer ring and including at least one raceway, wherein at least one electrically insulating element is fixed to the bearing ring, wherein the electrically insulating element is formed using a mold (or mold cavity), wherein, during the method, a portion of the radially inner surface of the electrically insulating element is at least temporarily in contact with a portion of the contact surface area of the mold, wherein the distance of the portion of the contact surface area from the central axis of the bearing ring is greater than half the maximum diameter of the raceway. In this way, high-quality rolling bearing ring units can be provided. In particular, during the method, the application of force by the mold (or mold cavity) on the bearing ring, which could potentially damage the bearing ring and / or the raceway, can be avoided.
[0014] Furthermore, a method for producing rolling bearing ring units (particularly rolling bearing ring units as described so far) is proposed, the rolling bearing ring unit having at least one bearing ring, the bearing ring being an inner ring and including at least one raceway, wherein at least one electrical insulating element is fixed to the bearing ring, wherein the electrical insulating element is formed using a mold (or mold cavity), wherein, during the method, at least a portion of the radially outer surface of the electrical insulating element is at least temporarily in contact with a contact surface area of the mold, wherein the distance of the contact surface area from the central axis of the bearing ring is less than the distance of the raceway from the central axis. In this way, high-quality rolling bearing ring units can be provided. In particular, during the method, the application of force by the mold (mold form) on the bearing ring, which could potentially damage the bearing ring and / or raceway, can be avoided.
[0015] Advantageously, the injection molding compound is injected into the mold at at least one point on one side of the bearing ring. Advantageously, the injection molding compound is injected at up to ten points on each face side of the bearing ring. In this way, the mold form can abut against a large surface area of the face sides of the bearing ring, where, in the case of an outer ring, the distance from the large surface area to the central axis of the bearing ring is greater than the distance from the raceway to the central axis, and in the case of an inner ring, the distance from the large surface area to the central axis is less than the distance from the raceway to the central axis. In particular, the method and manner of abutting the mold against the face sides of the bearing ring can prevent damage to the bearing ring and / or raceways by the mold form. Attached Figure Description
[0016] Further advantages will become apparent in the following description of the accompanying drawings. Examples of embodiments of the invention are illustrated in the drawings. The drawings, description, and claims collectively encompass numerous features. Those skilled in the art will also advantageously consider the features individually and combine them to form other useful combinations.
[0017] Figure 1 A view of the face side of the bearing according to the invention is shown.
[0018] Figure 2A It shows that according to Figure 1 The axial section of the bearing,
[0019] Figure 2B A portion of the axial section is shown during the production process.
[0020] Figure 3 It shows that according to Figure 1 The other axial section of the bearing,
[0021] Figure 4 A view of the other face side of the bearing is shown, and
[0022] Figure 5 A portion of the axial cross-section of another bearing according to the present invention is shown.
[0023] List of reference numerals
[0024]
[0025] Detailed Implementation
[0026] Figure 1 The diagram shows a face side view of the bearing, which includes a rolling bearing ring unit 10 according to the invention. The rolling bearing ring unit 10 includes an electrically insulating element 16 and a bearing ring 12 having a raceway 14. Figure 2A In the example shown in the attached drawings, the bearing ring 12, which is provided with the electrical insulating element 16, is the outer ring. Alternatively, the bearing ring can be the inner ring. The central axis 20 of the bearing ring 12 extends in the axial direction of the bearing ring 12.
[0027] Electrically insulating element 16 is fixed to bearing ring 12. The electrically insulating element is made of synthetic material (such as polyetheretherketone or polyamide 46 (abbreviated as PA46)) or elastomeric material (such as rubber).
[0028] Electrical insulation element 16 is directly fixed to bearing ring 12 on the outer side 30 of outer ring 12 and on both front sides 32 of bearing ring 12. Figure 3 Furthermore, the electrical insulating element 16 includes a radially inner surface 36 that does not contact the bearing ring 12, and includes a protrusion 38 and five other protrusions. Figure 2A and Figure 1 Alternatively, the electrical insulating element 16 is provided with fewer than six (one to five) protrusions, or strictly more than six protrusions. The protrusions extend radially inward. The protrusions can have any shape, for example, in... Figure 1 In the view, the protrusion can be square, or it can be round, etc.
[0029] Furthermore, the rolling bearing ring unit includes a bushing 39, which is fixed to the electrical insulating element 16 and consists of two parts 40 and 42. The two parts 40 and 42 are structurally identical, and each of the parts is L-shaped in axial cross-section. Each of the parts 40 and 42 is made of steel. The parts are made from sheet metal by stamping and rolling or machining. Alternatively, the bushing may consist of a single part.
[0030] The first imaginary half-plane 18 and the second imaginary half-plane 22 are connected by the central axis 20 ( Figure 1 The two half-planes are distinct from each other and define an angle 58 between them. According to the illustrated embodiment, the angle 58 is preferably less than 90°. A portion 24 of the insulating element 16 is located between the half-planes 18 and 22. Portion 24 is all of the insulating element 16 located between the half-planes 18 and 22.
[0031] A distance 23 is defined between the portion 24 and the central axis 20. According to the invention, the distance 23 is greater than half of the maximum diameter 26 of the raceway 14.
[0032] As a result of the present invention, a radial distance is defined between the inner end 36 of the portion 24 of the insulating element 16 and the bottom of the raceway 14 of the outer ring 12. This has the advantage that an improved molding process is applied to the bearing ring 12 when molding the electrical insulating material 16.
[0033] In the method for producing rolling bearing ring unit 10, the electrically insulating element 16 is fixed to the bearing ring by molding using a mold (or mold cavity) 44. Figure 2B During molding, a portion 46 of the radially inner surface of the electrical insulating element contacts a portion 48 of the contact surface area of the mold 44. The distance 50 of the contact surface area 48 from the central axis 20 of the bearing ring 12 is greater than half the maximum diameter 26 of the raceway 14. During molding, the mold applies axial force to the bearing ring in the area radially above the raceway 14, for most or all of the bearing ring. Therefore, the raceway and bearing ring are not damaged by the force applied by the mold. Because the injection molding compound that produces the electrical insulating element should be prevented from flowing through the gap between the bearing ring and the mold, the mold applies force to the bearing ring.
[0034] The injection molding compound is injected into the mold 44 at six points on the face side 54 of the bearing ring. No injection occurs on the second face side 56 of the bearing ring. Protrusions are formed at the injection points. Figure 1 ).
[0035] The bushing provides a large axial contact surface area. Furthermore, the bushing is molded and fixed to the bearing ring.
[0036] Bearings can be used, for example, to rotatably support a shaft in an electric motor. The motor can be part of an electric vehicle. Current is prevented from flowing through the bearing by using electrically insulating elements.
[0037] The advantage of electrical insulating elements is that they have low volume and low mass.
[0038] Molding is performed under known conditions.
[0039] Figure 5 An alternative implementation is shown. Essentially identical components, features, and functions are generally numbered using the same reference numerals. However, the letter "a" has been added. Figure 5 The reference numerals in the accompanying drawings are used to distinguish between embodiments. The following description is substantially limited to those described in the accompanying drawings. Figures 1 to 4 The differences in the implementation methods can be referred to here. Figures 1 to 4 The implementation method described herein is about maintaining the same components, features, and functions.
[0040] Figure 5 A rolling bearing ring unit 10a with a bearing ring 12a is shown, the bearing ring 12a being the inner ring. A portion 24a of the electrical insulating element 16a lies between two half-planes, as described with respect to the first embodiment. The portion 24a is any part of the insulating element 16a located between the two half-planes. The raceway 14a is at a distance greater than the maximum radius 28a of the portion 24a measured relative to the central axis.
Claims
1. A rolling bearing ring unit (10) having at least one bearing ring (12) and at least one electrically insulating element (16) fixed to said bearing ring (12), said bearing ring (12) being an outer ring and including at least one raceway (14), Its features are, There are a first imaginary half-plane (18) and a second imaginary half-plane (22), the first imaginary half-plane (18) being defined by the central axis (20) of the bearing ring (12), and the second imaginary half-plane (22) being also defined by the central axis (20) and different from the first half-plane (18), such that the distance (23) from the central axis (20) of all portions of the insulating element (16) located between the half-planes (18, 22) is greater than half the maximum diameter (26) of the raceway (14).
2. A rolling bearing ring unit (10a) having at least one bearing ring (12a) and at least one electrically insulating element (16a) fixed to said bearing ring, said bearing ring (12a) being an inner ring and including at least one raceway (14a), in, There are a first imaginary half-plane and a second imaginary half-plane. The first imaginary half-plane is defined by the central axis (20a) of the bearing ring (12a), and the second imaginary half-plane is also defined by the central axis (20a) and is different from the first half-plane, such that the distance of the raceway (14a) from the central axis (20a) is greater than the maximum radius (28a) of all portions of the insulating element located between the half-planes relative to the central axis.
3. The rolling bearing ring unit (10) according to claim 1 or claim 2, Its features are, The electrical insulating element (16) is directly fixed to the bearing ring (12) on at least two sides (30, 32).
4. The rolling bearing ring unit (10) according to at least one of the preceding claims, Its features are, The electrical insulating element (16) includes a radially inner surface (36) or a radially outer surface (36a) that does not contact the bearing ring (12) and includes at least one protrusion (38).
5. The rolling bearing ring unit (10) according to at least one of the preceding claims, Its features are, At least one bushing (39) is fixed to the electrical insulating element (16) and includes at least one component (40, 42).
6. The rolling bearing ring unit (10) according to claim 5, Its features are, Each of the two components (40, 42) is L-shaped in axial section.
7. A rolling bearing having at least one rolling bearing ring unit (10) according to at least one of the preceding claims.
8. A method for producing a rolling bearing ring unit (10), the rolling bearing ring unit (10) having at least one bearing ring (12), the bearing ring (12) being an outer ring and including at least one raceway (14), wherein, At least one electrical insulating element (16) is fixed to the bearing ring, wherein the electrical insulating element is formed using a mold (44), and wherein, during the method, a portion (46) of the radially inner surface of the electrical insulating element is at least temporarily in contact with a portion (48) of the contact surface area of the mold (44). Its features are, The distance (50) of the portion (48) of the contact surface area from the central axis (20) of the bearing ring (12) is greater than half the maximum diameter of the raceway.
9. A method for producing a rolling bearing ring unit (10a), said rolling bearing ring unit (10a) having at least one bearing ring (12a), said bearing ring (12a) being an inner ring and including at least one raceway (14a), wherein, At least one electrical insulating element (16a) is fixed to the bearing ring, wherein the electrical insulating element is formed using a mold, wherein... During the method, at least a portion (46a) of the radial outer surface of the electrical insulating element is in contact at least temporarily with a portion of the contact surface region of the mold. Wherein, the distance of the portion of the contact surface area from the central axis (20a) of the bearing ring (12a) is less than the distance (52a) of the raceway (14a) from the central axis.
10. The method according to claim 8 or claim 9, Its features are, The injection molding compound is injected into the mold (44) at up to ten points on each face side (54, 56) of the bearing ring.