Miniature deep groove ball bearing

Abstract

The utility model discloses a kind of miniature deep groove ball bearings applied to bearing field, by the cooperation of first sealing cover, second sealing cover and spacing clamping strip, sealing strip, first sealing cover can be cooperated with retainer gap after installation, when outer ring and inner ring produce axial misalignment, first sealing cover extrudes spacing clamping strip and sealing strip, to generate resistance to outer ring and inner ring axial displacement, simultaneously, first sealing cover can be positioned to retainer, so that the ball in retainer always remains in the recess of outer ring and inner ring, to utilize the ball retained in recess to limit outer ring and inner ring further misalignment, to reduce the probability that outer ring and inner ring of the miniature deep groove ball bearing produce larger axial misalignment, so that both can maintain stable connection relationship within a certain range, reduce the probability that axial jitter is generated, to improve the stability and reliability of the miniature deep groove ball bearing.

Description

Technical Field

[0001] This utility model relates to the field of bearings, and in particular to a miniature deep groove ball bearing. Background Technology

[0002] Deep groove ball bearings, formerly known as radial ball bearings, are the most widely used type of rolling bearing. They are characterized by low frictional resistance and high speed, and can be used in components that bear radial loads or combined radial and axial loads, as well as components that bear axial loads, such as small-power electric motors, automotive and tractor gearboxes, machine tool gearboxes, and general machinery and tools. To eliminate bearing axial clearance, improve bearing rigidity and rotational accuracy, and reduce axial movement, ball slippage, and noise during bearing operation, the bearing should be properly preloaded axially.

[0003] Existing technology (patent document with publication number "CN216430303U") discloses a miniature deep groove ball bearing for axial preload, comprising a spindle, a fixed sleeve fixedly connected to the outer wall of the spindle, a connecting sleeve movably connected to the outer wall of the fixed sleeve, and a bearing body fixedly connected to the lower wall of the connecting sleeve; the bearing body consists of an inner ring, an outer ring, a cage, and rolling balls; the connecting sleeve consists of a sleeve shell, a return spring, and rolling balls. This miniature deep groove ball bearing for axial preload has a simple structure, is easy to install, and can effectively improve the axial preload, thereby effectively eliminating the axial clearance of the bearing and improving the bearing rigidity and rotational accuracy.

[0004] Based on the above search and combined with existing technology, it was found that the axial preload of existing miniature deep groove ball bearings is generally applied through an external structure. However, the axial holding force between the inner and outer rings of the miniature deep groove ball bearing itself is not good (e.g., excessive axial clearance, additional axial force caused by installation errors, lubrication failure, etc.), which may still cause axial vibration, resulting in a decrease in rotational accuracy, and in severe cases, it may even lead to damage to the bearing structure. Utility Model Content

[0005] The core of this invention lies in the use of a first cover, a second cover, a limiting strip, and a sealing strip to solve the problem of poor axial holding force between the inner and outer rings of existing miniature deep groove ball bearings, which may still cause axial vibration. Simultaneously, the inclusion of two sets of first and second retaining rings further reduces the probability of axial runout during use, thereby further improving the stability of the miniature deep groove ball bearing.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A miniature deep groove ball bearing includes an outer ring, an inner ring, a plurality of evenly spaced balls rolled between the outer ring and the inner ring, and a cage movably sleeved on the balls. A first cover is installed between the inner ring and the outer ring. A first locking block is integrally formed on the inner side of the first cover near the inner ring. A second locking groove is opened on the inner ring to engage and match the first locking block. A gap is formed between the first cover and the retainer. A gap is formed between the outer side of the first cover near the outer ring and the inner wall of the outer ring. Multiple limiting strips are fixed on the inner wall of the outer ring near the first cover, arranged in a circumferential array along the axis of the outer ring. The limiting strips are located on the side of the first cover away from the ball and are fitted with the first cover with a gap. Multiple sealing strips that fit with the limiting strips are also fixed on the inner wall of the outer ring. The sealing strips fill the gaps between the first cover and the outer ring, and between the first cover and the limiting strips. The first cap and the center of the cage are also integrally formed with a reinforcing protrusion, which protrudes in an arc shape away from the cage.

[0008] By using the first cover in conjunction with the limiting strip and sealing strip, the first cover can be fitted with the cage after installation. When the outer ring and inner ring are axially misaligned, the first cover presses against the limiting strip and sealing strip, thereby generating resistance to the axial displacement of the outer and inner rings. At the same time, the first cover can limit the cage, so that the balls in the cage are always kept in the grooves of the outer and inner rings. The balls held in the grooves limit further misalignment between the outer and inner rings, thereby reducing the probability of large axial misalignment between the outer and inner rings of the miniature deep groove ball bearing. This allows the two to maintain a stable connection within a certain range, reducing the probability of axial vibration and thus improving the stability and reliability of the miniature deep groove ball bearing.

[0009] Furthermore, a second cover is installed between the outer ring and the inner ring. The second cover has a second locking block integrally formed on the outer side near the outer ring. The outer ring has a first locking groove that is adapted to engage with the second locking block. The second cover is located on the side of the first cover away from the retainer. A gap is formed between the second cover and the first cover. The second cover and the first cover are fitted together by a limiting structure. A gap is formed between the side of the second cover near the inner ring and the outer wall of the inner ring. The inner ring outer wall is also fixed with multiple limiting strips and multiple sealing strips. The multiple limiting strips are all located on the side of the second cover away from the first cover. The multiple limiting strips fit the gap between the second cover and the second cover. The multiple sealing strips fill the gap between the second cover and the inner ring, and between the second cover and the limiting strips.

[0010] Furthermore, the limiting structure includes a first binding ring and a second binding ring. The first binding ring is integrally formed on the side of the first cap near the second cap, and the end of the first binding ring near the second cap is in clearance fit with the side wall of the second cap near the first cap. The second binding ring is integrally formed on the side of the second cap near the first cap, and the end of the second binding ring near the first cap is in clearance fit with the side wall of the first cap near the second cap. The first binding ring and the second binding ring are in clearance fit with the side walls of their respective adjacent sides.

[0011] Furthermore, there are two of each of the first and second bundle rings, with the two first bundle rings and the two second bundle rings being distributed at intervals on both sides of the reinforcing protrusion, and the two first bundle rings corresponding one-to-one with the two second bundle rings.

[0012] Furthermore, a sealing ring is movably embedded between each first bundle ring and the adjacent second bundle ring, and the sealing ring is movably embedded in the side wall of the first bundle ring and the second bundle ring on the side that are close to each other.

[0013] Preferably, the end of the first cap that fits against the outer wall of the inner ring is integrally formed with a first extension portion, and one side of the first extension portion abuts against the outer wall of the inner ring; The end of the second cap that fits into the inner wall of the outer ring has a second extension integrally formed, and one side of the second extension abuts against the inner wall of the outer ring.

[0014] Compared with existing technologies, the advantages of this utility model are: (1) This solution uses the first cover in conjunction with the limiting strip and the sealing strip to make the first cover fit with the cage after installation. When the outer ring and the inner ring are axially misaligned, the first cover squeezes the limiting strip and the sealing strip, thereby generating resistance to the axial displacement of the outer ring and the inner ring. At the same time, the first cover can limit the cage, so that the balls in the cage are always kept in the grooves of the outer ring and the inner ring. The balls kept in the grooves limit the further misalignment of the outer ring and the inner ring, thereby reducing the probability of large axial misalignment between the outer ring and the inner ring of the miniature deep groove ball bearing. This allows the two to maintain a stable connection within a certain range, reducing the probability of axial vibration, thereby improving the stability and reliability of the miniature deep groove ball bearing.

[0015] (2) By adding a second cover and another set of limiting strips and sealing strips, when the outer ring and inner ring are axially misaligned, the second cover also squeezes the limiting strips and sealing strips, thereby generating resistance to the axial displacement of the outer ring and inner ring. When it works with the first cover, it can generate a stronger limiting force, reducing the probability of axial misalignment between the outer ring and inner ring. At the same time, the second cover can limit the first cover by the gap fit between the limiting structure and the first cover, thereby reducing the probability of the first cover being deformed by force. The two work together to form a double limiting effect, which can achieve a better holding effect, thereby further improving the stability and reliability of the miniature deep groove ball bearing.

[0016] (3) By setting the first and second binding rings, this solution can reduce the distance between the first and second caps and make them form a ring structure that hugs each other. The reduced gap between them can better support each other, making the fit between the first and second caps tighter and reducing the axial misalignment distance that may occur between the outer and inner rings. At the same time, the first and second binding rings also form a gap fit relationship. Therefore, when the first and second caps interact, they can convert part of the axial force into friction between them, thereby consuming the axial force between the outer and inner rings and further reducing the probability of axial runout during use, thus further improving the stability of the miniature deep groove ball bearing. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the first and second seals of this utility model when disassembled; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 for Figure 2 Enlarged view of the structure at point A in the middle; Figure 4 for Figure 2 Enlarged view of the structure at point B in the middle.

[0018] Explanation of the labels in the diagram: 1. Outer ring; 11. First slot; 2. Inner ring; 21. Second slot; 3. Ball bearing; 4. Cage; 5. First cover; 51. First locking block; 52. Reinforcing protrusion; 53. First extension; 54. First retaining ring; 6. Second cover; 61. Second locking block; 62. Second extension; 63. Second retaining ring; 7. Limiting strip; 8. Sealing strip; 9. Sealing ring. Detailed Implementation

[0019] The technical solution will now be clearly and completely described with reference to the accompanying drawings in the embodiments of this utility model.

[0020] First implementation method: Please see Figures 1-4 A miniature deep groove ball bearing includes an outer ring 1, an inner ring 2, a plurality of evenly spaced balls 3 that are rolled and embedded between the outer ring 1 and the inner ring 2, and a cage 4 that is movably sleeved on the balls 3. A first cover 5 is installed between the inner ring 2 and the outer ring 1. A first locking block 51 is integrally formed on the inner side of the first cover 5 near the inner ring 2. A second locking groove 21 is opened on the inner ring 2 to engage and match the first locking block 51. A gap is formed between the first cover 5 and the retainer 4. A gap is formed between the outer side of the first cover 5 near the outer ring 1 and the inner wall of the outer ring 1. Multiple limiting strips 7 are fixed on the inner wall of the outer ring 1 near the first cover 5, arranged in a circumferential array along the axis of the outer ring 1. The limiting strips 7 are located on the side of the first cover 5 away from the ball 3 and are in clearance fit with the first cover 5. Multiple sealing strips 8 are also fixed on the inner wall of the outer ring 1 and fit against the limiting strips 7. The sealing strips 8 fill the gaps between the first cover 5 and the outer ring 1, and between the first cover 5 and the limiting strips 7. The first cover 5 and the cage 4 are respectively located in the middle of which a reinforcing protrusion 52 is integrally formed. The reinforcing protrusion 52 protrudes in an arc shape away from the cage 4.

[0021] Based on the above structure, when the outer ring 1 and inner ring 2 are axially misaligned, the first cover 5 presses against the limiting strip 7 and the sealing strip 8, thereby generating resistance to the axial displacement of the outer ring 1 and inner ring 2. At the same time, the first cover 5 can limit the cage 4, so that the balls 3 in the cage 4 are always kept in the grooves of the outer ring 1 and inner ring 2. The balls 3 kept in the grooves limit the further misalignment of the outer ring 1 and inner ring 2, thereby reducing the probability of large axial misalignment between the outer ring 1 and inner ring 2 of the miniature deep groove ball bearing. This allows the two to maintain a stable connection within a certain range, reducing the probability of axial vibration, thereby improving the stability and reliability of the miniature deep groove ball bearing.

[0022] Furthermore, a second cover 6 is installed between the outer ring 1 and the inner ring 2. The second cover 6 has a second locking block 61 integrally formed on the outer side near the outer ring 1. The outer ring 1 has a first locking groove 11 that is adapted to engage with the second locking block 61. The second cover 6 is located on the side of the first cover 5 away from the retainer 4. A gap is formed between the second cover 6 and the first cover 5. The second cover 6 and the first cover 5 are fitted together by a limiting structure. A gap is formed between the side of the second cover 6 near the inner ring 2 and the outer wall of the inner ring 2. The outer wall of the inner ring 2 is also fixed with multiple limiting strips 7 and multiple sealing strips 8. The multiple limiting strips 7 are all located on the side of the second cover 6 away from the first cover 5. The multiple limiting strips 7 are fitted with the gap between the second cover 6 and the second cover 6. The multiple sealing strips 8 fill the gap between the second cover 6 and the inner ring 2, and between the second cover 6 and the limiting strips 7.

[0023] By adding a second cover 6 and another set of limiting strips 7 and sealing strips 8, when the outer ring 1 and inner ring 2 are axially misaligned, the second cover 6 also squeezes the limiting strips 7 and sealing strips 8, thereby generating resistance to the axial displacement of the outer ring 1 and inner ring 2. In conjunction with the first cover 5, it can generate a stronger limiting force, reducing the probability of axial misalignment between the outer ring 1 and inner ring 2. At the same time, the second cover 6, through the limiting structure and the clearance fit with the first cover 5, can limit the first cover 5, thereby reducing the probability of the first cover 5 being deformed by force. The two work together to form a double limiting effect, achieving a better holding effect, thereby further improving the stability and reliability of the miniature deep groove ball bearing.

[0024] Furthermore, the limiting structure includes a first binding ring 54 and a second binding ring 63. The first binding ring 54 is integrally formed on the side of the first cover 5 near the second cover 6. The end of the first binding ring 54 near the second cover 6 is in clearance fit with the side wall of the second cover 6 near the first cover 5. The second binding ring 63 is integrally formed on the side of the second cover 6 near the first cover 5. The end of the second binding ring 63 near the first cover 5 is in clearance fit with the side wall of the first cover 5 near the second cover 6. The first binding ring 54 and the second binding ring 63 are in clearance fit with the side walls of the two sides that are close to each other. By setting the first binding ring 54 and the second binding ring 63, the distance between the first cover 5 and the second cover 6 can be reduced, and the two can form a ring structure that hugs each other. The reduced gap between the two can better support each other, making the fit between the first cover 5 and the second cover 6 tighter, reducing the possible axial misalignment distance between the outer ring 1 and the inner ring 2. At the same time, the first binding ring 54 and the second binding ring 63 also form a clearance fit relationship. Therefore, when the first cover 5 and the second cover 6 interact, part of the axial force can be converted into friction between the two (the first binding ring 54 and the second binding ring 63 press against each other and generate local friction when they are axially misaligned, and radial friction may also be generated when they press against each other further). This consumes the axial force between the outer ring 1 and the inner ring 2, further reducing the probability of axial runout during use, and achieving the effect of further improving the stability of the miniature deep groove ball bearing.

[0025] Furthermore, there are two of each of the first and second bundle rings 54 and 63. The two first bundle rings 54 and the two second bundle rings 63 are distributed at intervals on both sides of the reinforcing protrusion 52, and the two first bundle rings 54 correspond one-to-one with the two second bundle rings 63. A sealing ring 9 is movably embedded between each first bundle ring 54 and the adjacent second bundle ring 63. The sealing ring 9 is movably embedded in the side wall of the first bundle ring 54 and the second bundle ring 63 on the side that are close to each other. By setting two sets of first retaining rings 54 and second retaining rings 63, and cooperating with sealing rings 9, an additional sealing structure can be formed between the first cover 5 and the second cover 6, thereby reducing the probability of external dust, water, etc. entering the interior of the miniature deep groove ball bearing. This provides better protection for the internal structures such as the balls 3 and cage 4, enabling the miniature deep groove ball bearing to be used in harsher environments (such as high dust, high humidity, and some water splashing environments), improving the reliability and applicability of the miniature deep groove ball bearing, and achieving better performance.

[0026] Second implementation method: Please see Figures 1-4 A miniature deep groove ball bearing, which differs from the first embodiment in that: The end of the first cover 5 that is attached to the outer wall of the inner ring 2 is integrally formed with a first extension 53, and one side of the first extension 53 abuts against the outer wall of the inner ring 2. The end of the second cover 6 that is attached to the inner wall of the outer ring 1 is integrally formed with a second extension 62, and one side of the second extension 62 is pressed against the inner wall of the outer ring 1. By providing the first extension portion 53 and the second extension portion 62, the contact area between the first cover 5 and the inner ring 2, and between the second cover 6 and the outer ring 1, can be increased, thereby improving the installation stability of the first cover 5 and the second cover 6. At the same time, it can enhance the structural strength of the connection between the first cover 5 and the second cover 6, reduce the probability of damage to the first cover 5 and the second cover 6 due to insufficient local bearing capacity during use, and improve the reliability and stability of the miniature deep groove ball bearing.

[0027] The above description is merely a preferred embodiment of this utility model; it encompasses all the protection scope of this utility model. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be covered within the protection scope of this utility model.

Claims

1. A miniature deep groove ball bearing, comprising an outer ring (1), an inner ring (2), a plurality of evenly spaced balls (3) rollingly embedded between the outer ring (1) and the inner ring (2), and a cage (4) movably sleeved on the balls (3), characterized in that: A first cover (5) is installed between the inner ring (2) and the outer ring (1). The first cover (5) has a first locking block (51) integrally formed on the inner side of the inner ring (2). The inner ring (2) has a second locking groove (21) that is adapted to engage with the first locking block (51). A gap is formed between the first cover (5) and the retainer (4). A gap is formed between the outer side of the first cover (5) near the outer ring (1) and the inner wall of the outer ring (1). The outer ring (1) is fixed with a plurality of limiting strips (7) arranged in a circumferential array along the axis of the outer ring (1) near the inner wall of the first cover (5). The limiting strips (7) are located on the side of the first cover (5) away from the ball (3) and are in clearance fit with the first cover (5). The inner wall of the outer ring (1) is also fixed with a plurality of sealing strips (8) that fit with the limiting strips (7). The sealing strips (8) fill the gaps between the first cover (5) and the outer ring (1), and between the first cover (5) and the limiting strips (7). The first cover (5) is also integrally formed with a reinforcing protrusion (52) at the center corresponding to the position of the retainer (4), and the reinforcing protrusion (52) protrudes in an arc shape to the side away from the retainer (4).

2. A miniature deep groove ball bearing according to claim 1, characterized in that: A second cover (6) is also installed between the outer ring (1) and the inner ring (2). The second cover (6) has a second locking block (61) integrally formed on the outer side of the outer ring (1). The outer ring (1) has a first locking groove (11) that is compatible with the second locking block (61). The second cover (6) is located on the side of the first cover (5) away from the retainer (4). A gap is formed between the second cover (6) and the first cover (5). The second cover (6) and the first cover (5) are fitted together by a limiting structure. A gap is formed between the side of the second cover (6) near the inner ring (2) and the outer wall of the inner ring (2). The outer wall of the inner ring (2) is also fixed with multiple limiting strips (7) and multiple sealing strips (8). The multiple limiting strips (7) are all located on the side of the second cover (6) away from the first cover (5). The multiple limiting strips (7) fit the gap between the second cover (6) and the second cover (6). The multiple sealing strips (8) fill the gap between the second cover (6) and the inner ring (2), and between the second cover (6) and the limiting strips (7).

3. A miniature deep groove ball bearing according to claim 2, characterized in that: The limiting structure includes a first binding ring (54) and a second binding ring (63). The first binding ring (54) is integrally formed on the side of the first cover (5) near the second cover (6). The end of the first binding ring (54) near the second cover (6) is in clearance fit with the side wall of the second cover (6) near the first cover (5). The second binding ring (63) is integrally formed on the side of the second cover (6) near the first cover (5). The end of the second binding ring (63) near the first cover (5) is in clearance fit with the side wall of the first cover (5) near the second cover (6). The first binding ring (54) and the second binding ring (63) are in clearance fit with the side walls of the two sides that are close to each other.

4. A miniature deep groove ball bearing according to claim 3, characterized in that: Two of each of the first and second bundle rings (54) are provided. The two first bundle rings (54) and the two second bundle rings (63) are distributed at intervals on both sides of the reinforcing protrusion (52). The two first bundle rings (54) correspond one-to-one with the two second bundle rings (63).

5. A miniature deep groove ball bearing according to claim 4, characterized in that: A sealing ring (9) is movably embedded between each of the first bundle rings (54) and the adjacent second bundle ring (63). The sealing ring (9) is movably embedded in the side wall of the first bundle ring (54) and the second bundle ring (63) on the side that are close to each other.

6. A miniature deep groove ball bearing according to claim 2, characterized in that: The first cover (5) is integrally formed with a first extension (53) at the end that fits against the outer wall of the inner ring (2), and one side of the first extension (53) abuts against the outer wall of the inner ring (2); The end of the second cover (6) that fits against the inner wall of the outer ring (1) is integrally formed with a second extension (62), and one side of the second extension (62) abuts against the inner wall of the outer ring (1).

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