Crown-shaped bearing retainer and rolling bearing thereof

Abstract

The utility model discloses a crown-shaped bearing retainer and a rolling bearing thereof, and belongs to the technical field of bearing processing, the crown-shaped bearing retainer comprises an annular retainer main body, pockets with the same number as steel balls are arranged on the retainer main body along the circumferential direction, an opening is arranged on one side of each pocket along the axial direction of the retainer main body, and the opening is communicated with the retainer main body. The distance between the openings is smaller than the diameter of the steel balls to form a locking opening, a plurality of protruding parts are symmetrically formed on the side, facing the outer ring, of the retainer body, and the outer side of each protruding part is provided with an arc-shaped face in clearance fit with the outer ring. The radial vibration of the retainer main body can be effectively limited, so that the retainer main body and the steel balls can stably rotate together, and the abrasion and the bearing noise are reduced.

Description

Technical Field

[0001] This utility model relates to the field of bearing processing technology, and in particular to a crown bearing cage and its rolling bearing. Background Technology

[0002] Rolling bearings consist of concentric outer and inner rings, and steel balls arranged between the outer and inner rings. To isolate the steel balls and guide them to be held within the bearing, a bearing cage is installed between the outer and inner rings. To simplify the assembly process of the bearing cage, a crown cage design is usually adopted, in which one end of the bearing cage is designed as a side-opening pocket with the same number of steel balls.

[0003] Currently, the inner surface of the pockets on crown bearing cages is typically machined into a cylindrical surface. For example, patent CN209781473U discloses a high-performance plastic cage for rolling bearings, the body of which is a ring structure formed by pockets. The inner surface of each pocket forms an inner cylindrical surface, and the upper surfaces at both ends of each pocket are provided with reinforcing ribs with steel ball mounting guide surfaces. During high-speed rotation of the bearing, the center position of the aforementioned bearing cage tends to shift, especially when applied to bearings with a large distance between the outer and inner rings. This tendency is particularly pronounced, causing abnormal vibrations along the radial direction of the bearing between the cage and the steel balls, accelerating cage wear, and increasing bearing rotational noise. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a crown bearing cage and its rolling bearing, which limits the radial vibration of the cage to ensure stable rotation of the cage and steel balls, thereby reducing wear and bearing noise.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A crown bearing cage includes an annular cage body. The cage body has pockets circumferentially arranged in the same number as the steel balls. Each pocket has an opening on one axial side of the cage body, and the spacing between the openings is smaller than the diameter of the steel balls, forming a locking mechanism. The cage body has multiple symmetrically formed protrusions on the outer ring side, and each protrusion has an arc-shaped surface on its outer side that clearance-fits with the outer ring. By providing protrusions on the outer ring side of the cage body, when the bearing operates at high speed, the center position of the cage body tends to shift. At this time, the protrusions become the pre-contact positions between the cage body and the outer ring. After contact occurs, the protrusions cause the cage body to return to its center position, thereby reducing abnormal radial vibration of the cage body, making the bearing rotate more smoothly, and effectively reducing wear and bearing noise.

[0007] There are two protrusions, each located between two adjacent pockets, with both sides of the protrusions extending to the outer edge of the pocket.

[0008] The protrusion has a guide arc surface on the side near the opening. When installing the guide frame, the guide arc surface provides guidance for the main body of the cage to be inserted into the inner side of the outer ring, ensuring the original smooth installation.

[0009] The protrusion has a lubrication groove extending to both sides and communicating with adjacent pockets. During bearing rotation, the lubrication groove, used to lubricate the steel balls between the inner and outer rings, is drawn into the lubrication groove by the rolling of the steel balls, forming lubrication within the gap between the protrusion and the outer ring, thereby reducing friction between the protrusion and the outer ring.

[0010] The lubrication groove has an oil-guiding arc surface that smoothly transitions to the inside of the pocket at the connection point with the pocket.

[0011] The inner side of the pocket is provided with a gradually decreasing inner conical surface, an inner spherical surface that fits with the upper hemisphere of the steel ball, and a chamfered outer arc surface in sequence from the inside to the outside. The inner spherical surface encloses the steel ball, reducing the gap between the cage column and the steel ball, thereby further reducing the radial vibration of the cage body relative to the steel ball. The design of the chamfered outer arc surface and the inner conical surface on both sides of the inner spherical surface minimizes the contact area between the inner side of the pocket and the steel ball, thus effectively reducing wear between the steel ball and the cage.

[0012] The inner conical surface is internally tangent to the inner spherical surface, and the chamfered outer arc surface smoothly transitions to the inner spherical surface.

[0013] The gap between the protrusion and the outer ring is the same as the gap between the inner spherical surface and the steel ball.

[0014] The cage body is made of nylon. Compared to metal cages, nylon can better absorb the vibrations transmitted by the steel balls and inner and outer rings during bearing rotation, further reducing bearing noise.

[0015] A rolling bearing includes an outer ring, an inner ring, steel balls, and a crown bearing cage, wherein the steel balls are rotatably mounted between the inner raceway of the outer ring and the outer raceway of the inner ring via the crown bearing cage.

[0016] This utility model has the following beneficial effects:

[0017] This invention features a protrusion on the outer ring side of the cage body. When the bearing operates at high speed, the center position of the cage body tends to shift. At this time, the protrusion becomes the pre-contact position between the cage body and the outer ring. After contact occurs, the protrusion causes the cage body to return to its center, thereby reducing abnormal vibration of the cage body in the radial direction, making the bearing rotate more smoothly, and effectively reducing wear and bearing noise. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the main body of the cage in this utility model;

[0020] Figure 2 This is a front view of the main body of the cage in this utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the rolling bearing in this utility model;

[0022] Figure 4 for Figure 3 A partial sectional view along the longitudinal direction;

[0023] Figure 5 for Figure 3 A partial sectional view along the radial direction.

[0024] 1. Outer ring; 101. Inner raceway; 2. Inner ring; 201. Outer raceway; 3. Steel ball; 4. Cage body; 401. Pocket; 401a. Inner conical surface; 401b. Inner spherical surface; 401c. Chamfered outer arc surface; 402. Opening; 403. Unloading groove; 5. Protrusion; 501. Lubrication groove; 502. Oil guiding arc surface; 503. Guide arc surface. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] like Figure 1 and Figure 2 As shown, this utility model provides a crown bearing cage, including an annular cage body 4. The cage body 4 has pockets 401 of the same number as steel balls 3 circumferentially arranged. Each pocket 401 has an opening 402 on one side of the cage body 4 along the axial direction. The spacing of the openings 402 is smaller than the diameter of the steel balls 3 to form a locking groove. It is worth noting that a stress relief groove 403 is provided on the cage body 4 between the locking grooves of two adjacent pockets 401. When the steel balls 3 are squeezed from the openings 402 into the pockets 401, the stress relief groove 403 provides deformation space for the cage body 4 on both sides of the openings 402, thereby ensuring smooth installation.

[0030] The cage body 4 is symmetrically formed with multiple protrusions 5 on the side facing the outer ring 1. Each protrusion 5 has an arc-shaped surface on its outer side that is clearance-fitted with the outer ring 1. Through the arrangement of these protrusions 5, when the bearing operates at high speed, the center position of the cage body 4 tends to shift. At this time, the protrusions 5 become the pre-contact positions between the cage body 4 and the outer ring 1. After contact occurs, the protrusions 5 cause the cage body 4 to return to its center, thereby reducing abnormal radial vibration of the cage body 4, making the bearing rotate more smoothly, and effectively reducing wear and bearing noise.

[0031] Preferably, the cage body 4 is made of nylon. Compared to a metal cage, nylon can better absorb the vibrations transmitted by the steel balls 3 and the inner and outer rings during bearing rotation, further reducing bearing noise.

[0032] While ensuring that the protrusion 5 has a pre-contact function, the contact area between it and the inner side of the outer ring 1 is minimized, such as... Figure 2 As shown, there are two protrusions 5, each of which is located between two adjacent pockets 401, and the two sides of the protrusions 5 extend to the outer edge of the pockets 401.

[0033] To ensure that the guide frame maintains its original smoothness during installation, such as Figure 1 As shown, the protrusion 5 has a guide arc surface 503 on the side near the opening 402, and the guide arc surface 503 provides a guiding function for the cage body 4 to be inserted into the inner side of the outer ring 1.

[0034] like Figure 1 and Figure 4 As shown, a lubrication groove 501 is provided on the protrusion 5. The lubrication groove 501 extends to both sides and communicates with the adjacent pocket 401. The lubrication groove 501 is connected to the pocket 401. During bearing rotation, the lubricant used to lubricate the steel ball 3 between the inner ring 2 and the outer ring 1 is carried into the lubrication groove 501 by the rolling of the steel ball 3, forming lubricant in the gap between the protrusion 5 and the outer ring 1, thereby reducing friction between the protrusion 5 and the outer ring 1. More preferably, to ensure more effective entry of lubricating oil into the lubrication groove 501, the position where the lubrication groove 501 connects to the pocket 401 has an oil-guiding arc surface 502 that smoothly transitions to the inner side of the pocket 401.

[0035] like Figure 1 and Figure 5 As shown, the inner side of the pocket 401 is provided with a gradually decreasing inner conical surface 401a, an inner spherical surface 401b that fits with the upper hemisphere of the steel ball 3, and a chamfered outer arc surface 401c in sequence from the inside to the outside. The inner spherical surface 401b encloses the steel ball 3 to reduce the gap between the cage column and the steel ball 3, thereby further reducing the radial vibration of the cage body 4 relative to the steel ball 3. The design of the chamfered outer arc surface 401c and the inner conical surface 401a on both sides of the inner spherical surface 401b minimizes the contact area between the inner side of the pocket 401 and the steel ball 3, thereby effectively reducing the wear between the steel ball 3 and the cage body 4.

[0036] To ensure the flatness of the inner side of the pocket 401, the inner conical surface 401a is internally tangent to the inner spherical surface 401b, and the chamfered outer arc surface 401c smoothly transitions to the inner spherical surface 401b.

[0037] like Figure 5As shown, the gap D1 between the protrusion 5 and the outer ring 1 is the same as the gap D2 between the inner spherical surface 401b and the steel ball 3. This ensures better stability between the cage and the steel ball 3 when the steel ball 3 moves together with the cage body 4.

[0038] like Figures 3-5 As shown, this utility model also provides a rolling bearing, including an outer ring 1, an inner ring 2, steel balls 3, and the aforementioned crown bearing cage. The steel balls 3 are rotatably mounted between the inner raceway 101 of the outer ring 1 and the outer raceway 201 of the inner ring 2 via the crown bearing cage. When the bearing is running at high speed, the inner spherical surface 401b of the pocket 401 on the cage body 4 partially encloses the steel balls 3. Compared with the existing cylindrical pocket 401, the steel balls 3 provide an inner contact surface restriction for the cage body 4, which tends to shift. The protrusion 5 on the outer side of the cage and the clearance fit with the outer ring 1 provide an outer contact surface restriction, thereby allowing the cage body 4 to return to the center under the tendency of center shift, reducing abnormal vibration of the cage body 4 in the radial direction, making the bearing rotate more smoothly. At the same time, the lubrication groove 501 on the protrusion 5 contains the same lubricant as between the steel balls 3 and the inner and outer rings, ensuring minimal wear during bearing operation, significantly reducing bearing noise, and improving bearing life.

[0039] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A crown bearing cage, comprising an annular cage body, wherein the cage body has pockets of the same number as steel balls along its circumferential direction, and each pocket has an opening on one side along the axial direction of the cage body, the spacing between the openings being smaller than the diameter of the steel balls to form a locking groove, characterized in that, The main body of the cage is symmetrically formed with multiple protrusions on the side facing the outer ring, and the outer side of each protrusion has an arc-shaped surface that fits with the outer ring with a gap.

2. A crown bearing cage according to claim 1, characterized in that, There are two protrusions, each located between two adjacent pockets, with both sides of the protrusions extending to the outer edge of the pocket.

3. A crown bearing cage according to claim 1 or 2, characterized in that, The protrusion has a guide arc surface on the side near the opening.

4. A crown bearing cage according to claim 1 or 2, characterized in that, The protrusion is provided with a lubrication groove, which extends to both sides and connects to the adjacent pocket.

5. A crown bearing cage according to claim 4, characterized in that, The lubrication groove has an oil-guiding arc surface that smoothly transitions to the inside of the pocket at the connection point with the pocket.

6. A crown bearing cage according to claim 1 or 2, characterized in that, The inner side of the pocket is provided with an inner conical surface with gradually decreasing size, an inner spherical surface that fits with the upper hemisphere of the steel ball, and a chamfered outer arc surface in sequence from the inside to the outside.

7. A crown bearing cage according to claim 6, characterized in that, The inner conical surface is internally tangent to the inner spherical surface, and the chamfered outer arc surface smoothly transitions to the inner spherical surface.

8. A crown bearing cage according to claim 6, characterized in that, The gap between the protrusion and the outer ring is the same as the gap between the inner spherical surface and the steel ball.

9. A crown bearing cage according to claim 1, characterized in that, The main body of the cage is made of nylon.

10. A rolling bearing, characterized in that, It includes an outer ring, an inner ring, steel balls, and a crown bearing cage as described in any one of claims 1-9, wherein the steel balls are rotatably mounted between the inner raceway of the outer ring and the outer raceway of the inner ring via the crown bearing cage.

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