Double-layer single-row deep groove ball bearing, speed reducer and motor
Through the double-layer single-row deep groove ball bearing structure, the preset speed and continuous rotation of the secondary bearings solve the problem of friction heating of traditional bearings under high load and high speed, and achieve the consideration of high load and long life of bearings at high speed .
Patent Information
- Application Number
- CN202420445288.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-08
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-03-08
AI Technical Summary
Traditional single-row deep groove ball bearings are difficult to meet the needs of use under high loads and high speeds, and are prone to burns due to frictional heating and cannot continue to rotate.
Using a double-layer single-row deep groove ball bearing structure, through the design of first-stage and second-stage rolling balls, the preset speed makes the relative linear speed of first-stage rolling balls within a safe range, and the continuous rotation of second-stage bearings increases the rotation speed of first-stage bearings , reduce friction, meet load requirements and extend life.
It significantly improves the bearing load and life, ensuring that the bearing can run stably under high-speed rotation, with a compact structure, simple manufacturing and good use effect.
Smart Images
Figure CN222351164U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of bearings, and in particular to a double-layer single-row deep groove ball bearing, a reducer and a motor. Background Art
[0002] Each bearing has its own maximum operating speed, which is mainly limited by the temperature rise caused by friction heating in the bearing. When the speed exceeds a certain limit, the bearing will be unable to continue rotating due to burning, or even stuck. The maximum speed of the bearing refers to the boundary value of friction heating and continuous rotation without burning. Of course, the maximum speed of the bearing also depends on the type, size and precision of the bearing, the lubrication method, the quality and quantity of the lubricant, the material and type of the cage, the load conditions and other factors.
[0003] Usually, high-speed bearings refer to bearings with a linear speed of 60 meters per second. Therefore, many bearing manufacturers have introduced NDm values as important reference data for bearing selection. The higher the NDm value, the higher the bearing operating speed.
[0004] Traditional bearings generally use single-row deep groove balls or double-row deep groove balls with axially parallel rolling elements. In high-speed bearings, small-diameter, small-ball single-row deep groove ball bearings are usually used to obtain a higher NDm value, which makes the bearing life relatively long. However, due to the influence of load, when large load and high-speed bearings are required, the use requirements cannot be met by selecting small-diameter, small-ball single-row deep groove ball bearings.
[0005] Therefore, there is an urgent need to provide a double-layer single-row deep groove ball bearing to solve the above-mentioned technical problems. Utility Model Content
[0006] The utility model provides a double-layer single-row deep groove ball bearing, a reducer and a motor, which can meet the load requirements by designing the bearing structure and can also maintain the bearing life under high-speed rotation.
[0007] According to some embodiments, the utility model provides a double-layer single-row deep groove ball bearing, comprising: a primary bearing inner ring, a primary bearing outer ring and a secondary bearing outer ring; a primary rolling sphere is arranged between the primary bearing inner ring and the primary bearing outer ring, and a primary sphere retaining frame is arranged on the side of the primary rolling sphere; a secondary rolling sphere is arranged between the primary bearing outer ring and the secondary bearing outer ring, and a secondary sphere retaining frame is arranged on the side of the secondary rolling sphere.
[0008] Optionally, an expansion ring is further provided between the first-level bearing inner ring and the first-level bearing outer ring, and the expansion ring is located beside the first-level ball retainer.
[0009] Optionally, the first-stage bearing inner ring and the first-stage bearing outer ring are respectively provided with grooves at relative inner wall positions, and the expansion ring is nested in the grooves.
[0010] Optionally, the inner cavity between the primary bearing outer ring and the secondary bearing outer ring is sealed by two annular sealing covers arranged axially opposite to each other.
[0011] Optionally, the gap between the primary bearing inner ring and the primary bearing outer ring is filled with vacuum silicone grease, and the vacuum silicone grease is coated on the primary ball retainer and the primary rolling ball.
[0012] Optionally, the gap between the primary bearing outer ring and the secondary bearing outer ring is filled with vacuum silicone grease, and the vacuum silicone grease is coated on the secondary ball retainer and the secondary rolling ball.
[0013] According to some embodiments, the utility model further provides a reducer, including a rotating part and a non-rotating part, wherein the rotating part and the non-rotating part are connected by the double-layer single-row deep groove ball bearing.
[0014] According to some embodiments, the utility model further provides a motor, including a rotor and a stator, wherein the rotor and the stator are connected by means of the double-layer single-row deep groove ball bearing.
[0015] Beneficial effects:
[0016] In the utility model, when the single-row deep groove ball bearing meets the load requirement but the rotation speed does not meet the requirement, the relative linear speed of the rolling ball during rotation is reduced, thereby improving the NDm value of the traditional single-layer bearing, so that the bearing life can be maintained under high-speed rotation. By designing the bearing structure, an inner and outer double-layer single-row deep groove ball bearing structure is adopted. After the preset rotation speed is reached, the secondary bearing rotates, so that the relative linear speed between the primary rolling ball and the outer ring of the primary bearing is stabilized within a safe range. The continuous rotation of the secondary bearing can further improve the operating speed of the primary bearing, so that it can meet the load requirement and maintain the bearing life under high-speed rotation. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the conventional technology, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0018] Figure 1 It is a partial cross-sectional schematic diagram of the double-layer single-row deep groove ball bearing in this embodiment.
[0019] Figure numerals: 1. primary bearing inner ring; 2. primary bearing outer ring; 3. secondary bearing outer ring; 4. primary rolling ball; 5. primary ball retainer; 6. secondary rolling ball; 7. secondary ball retainer; 8. expansion ring; 9. groove; 101. annular sealing cover. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings. However, it can be understood by those skilled in the art that in each embodiment of the utility model, many technical details are proposed in order to enable readers to better understand the utility model. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed for protection of the utility model can also be implemented. The division of the following embodiments is for the convenience of description and should not constitute any limitation on the specific implementation of the utility model. The various embodiments can be combined and referenced with each other without contradiction.
[0021] The following is a detailed description of a double-layer single-row deep groove ball bearing provided in this embodiment in conjunction with the accompanying drawings. Figure 1 As shown, it includes: a primary bearing inner ring 1, a primary bearing outer ring 2 and a secondary bearing outer ring 3, wherein a primary rolling ball 4 is arranged between the primary bearing inner ring 1 and the primary bearing outer ring 2, and a primary ball retainer 5 is arranged beside the primary rolling ball 4, and the primary ball retainer 5 can separate the primary rolling ball 4 along the circumferential direction, thereby forming a primary bearing between the primary bearing inner ring 1, the primary bearing outer ring 2 and the primary rolling ball 4; a secondary rolling ball 6 is arranged between the primary bearing outer ring 2 and the secondary bearing outer ring 3, and a secondary ball retainer 7 is arranged beside the secondary rolling ball 6, and the secondary ball retainer 7 can separate the secondary rolling ball 6 along the circumferential direction, thereby forming a secondary bearing between the primary bearing outer ring 2, the secondary bearing outer ring 3 and the secondary rolling ball 6.
[0022] In this embodiment, when the single-row deep groove ball bearing meets the load requirement but the speed does not meet the requirement, the bearing structure is designed in this embodiment to adopt a double-layer single-row deep groove ball bearing structure. After the preset speed, the secondary bearing rotates to stabilize the relative linear velocity between the primary rolling ball 4 of the primary bearing and the primary bearing outer ring 2 within a safe range. The operating speed of the primary bearing can be further increased by the continuous rotation of the secondary bearing. Therefore, the double-layer single-row deep groove ball bearing in this embodiment can meet the load requirement and maintain the bearing life under high-speed rotation, so that the bearing load can be significantly improved when the axial size is constant. This solution has a compact and simple structure, is easy to manufacture and process, and has a good use effect.
[0023] Please continue to refer to Figure 1 As shown, in this embodiment, it should be noted that an expansion ring 8 is also provided between the primary bearing inner ring 1 and the primary bearing outer ring 2, and the expansion ring 8 is located beside the primary ball retainer 5. When the rotation speed of the primary bearing inner ring 1 is continuously increased to a specific value, the expansion ring 8 will be deformed due to the centrifugal force, and begin to contact and generate friction with the primary bearing outer ring 2, thereby driving the primary bearing outer ring 2 to rotate. From a microscopic point of view, the primary rolling ball 4 and the primary bearing outer ring 2 move relative to each other, and the movement direction is consistent, so that the surface linear velocity of the primary rolling ball 4 can be reduced, and the mutual friction can be reduced.
[0024] It should also be noted that grooves 9 are respectively provided at the relative inner wall positions of the first-stage bearing inner ring 1 and the first-stage bearing outer ring 2, and the expansion ring 8 is nested in the groove 9. The arrangement of the groove 9 facilitates the positioning of the expansion ring 8.
[0025] Please continue to refer to Figure 1 As shown, in this embodiment, it is also necessary to explain that the inner cavity between the primary bearing outer ring 2 and the secondary bearing outer ring 3 is sealed by two annular sealing covers 101 arranged axially opposite to each other. The use of the annular sealing covers 101 can prevent external dust from entering between the primary bearing outer ring 2 and the secondary bearing outer ring 3 and affecting the rotation of the secondary rolling ball 6. Of course, it can be understood that the expansion ring 8 is arranged on the side of the primary ball retainer 5, which can also prevent external dust from entering between the primary bearing inner ring 1 and the primary bearing outer ring 2 and affecting the rotation of the primary rolling ball 4.
[0026] In other embodiments, the gap between the primary bearing inner ring 1 and the primary bearing outer ring 2 is filled with vacuum silicone grease, which is coated on the primary ball retainer 5 and the primary rolling ball 4. The gap between the primary bearing outer ring 2 and the secondary bearing outer ring 3 is also filled with vacuum silicone grease, which is coated on the secondary ball retainer 7 and the secondary rolling ball 6. By coating the vacuum silicone grease on the retainer and the rolling ball, the normal operation of the bearing under high and low temperature conditions can be ensured without problems of clamping or unsmooth rotation, and sufficient lubrication and heat dissipation can be ensured.
[0027] In one example, the primary rolling ball 4 and the secondary rolling ball 6 in this embodiment are balls.
[0028] In one example, the primary bearing, secondary bearing, cage and annular sealing cover 101 in this embodiment are all made of stainless steel. Using stainless steel can further improve the performance of the double-layer single-row deep groove ball bearing, increase the use range of the bearing, and ensure its reliable and stable use.
[0029] The implementation principle of this embodiment is as follows: when the external connecting shaft is fixedly connected to the first-level bearing inner ring 1 and rotates, the first-level rolling ball 4 rolls between the first-level bearing inner ring 1 and the first-level bearing outer ring 2 due to friction. When the rotation speed of the first-level bearing inner ring 1 continues to increase to a specific value, the expansion ring 8 will be deformed due to the centrifugal force, and begin to contact and generate friction with the first-level bearing outer ring 2, thereby driving the first-level bearing outer ring 2 to rotate. Continuing to increase the rotation speed of the first-level bearing inner ring 1 will also cause the rotation speed of the first-level bearing outer ring 2 to continue to increase. The second-level rolling ball 6 rolls between the first-level bearing outer ring 2 and the second-level bearing outer ring 3. When the rotation speed is increased to the point where the surface linear velocity of the second-level rolling ball 6 reaches the limit value, the bearing reaches the limit speed.
[0030] Example 2
[0031] The embodiment of the present application also provides a reducer, including a rotating part and a non-rotating part, wherein the rotating part and the non-rotating part are connected by the above-mentioned double-layer single-row deep groove ball bearing.
[0032] Example 3
[0033] An embodiment of the present application also provides a motor, including a rotor and a stator, wherein the rotor and the stator are connected by the above-mentioned double-layer single-row deep groove ball bearing.
[0034] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation on the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the scope of protection of the present invention. In addition, the claims attached to the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the attached claims or the equivalent forms of such scope and boundaries.
Claims
1. A double-layer single-row deep groove ball bearing, characterized in that: include: A primary bearing inner ring (1), a primary bearing outer ring (2) and a secondary bearing outer ring (3); A primary rolling ball (4) is arranged between the primary bearing inner ring (1) and the primary bearing outer ring (2), and a primary ball retainer (5) is arranged beside the primary rolling ball (4); A secondary rolling ball (6) is arranged between the primary bearing outer ring (2) and the secondary bearing outer ring (3), and a secondary ball retainer (7) is arranged beside the secondary rolling ball (6); An expansion ring (8) is also provided between the first-level bearing inner ring (1) and the first-level bearing outer ring (2), and the expansion ring (8) is located beside the first-level ball retainer (5).
2. The double-layer single-row deep groove ball bearing according to claim 1, characterized in that: The first-stage bearing inner ring (1) and the first-stage bearing outer ring (2) are respectively provided with grooves (9) at relative inner wall positions, and the expansion ring (8) is nested in the grooves (9).
3. The double-layer single-row deep groove ball bearing according to claim 2, characterized in that: The inner cavity between the primary bearing outer ring (2) and the secondary bearing outer ring (3) is sealed by two annular sealing covers (101) arranged axially opposite to each other.
4. The double-layer single-row deep groove ball bearing according to claim 3, characterized in that: The gap between the first-level bearing inner ring (1) and the first-level bearing outer ring (2) is filled with vacuum silicone grease, and the vacuum silicone grease is coated on the first-level ball retainer (5) and the first-level rolling ball (4).
5. The double-layer single-row deep groove ball bearing according to claim 4, characterized in that: The gap between the primary bearing outer ring (2) and the secondary bearing outer ring (3) is filled with vacuum silicone grease, and the vacuum silicone grease is coated on the secondary ball retainer (7) and the secondary rolling ball (6).
6. A reducer, comprising a rotating part and a non-rotating part, characterized in that: The rotating part and the non-rotating part are connected by means of a double-layer single-row deep groove ball bearing as described in any one of claims 1-5.
7. A motor, comprising a rotor and a stator, characterized in that: The rotor and the stator are connected by means of a double-layer single-row deep groove ball bearing as described in any one of claims 1-5.