Angular contact ball bearing cage, angular contact ball bearing

Abstract

The present invention provides an angular contact ball bearing retainer and an angular contact ball bearing. The retainer includes an annular frame having a plurality of pockets formed therein. The pockets are spaced apart circumferentially along the annular frame, each pocket having a radially inner locking notch and a radially outer locking notch. The annular frame has a central cylindrical surface concentric with the annular frame, the central cylindrical surface intersecting with the pocket walls at a central ring. The pocket walls between the radially inner locking notch and the central ring, and between the radially outer locking notch and the central ring, are both flared. The flared structures can guide and correct a ball within the pocket in a radial direction along the annular frame. According to the present invention, the axial, circumferential, and radial motion of the ball can be simultaneously constrained and guided, thereby improving the retainer's ability to correct the ball's motion trajectory and thereby reducing vibration, noise, and frictional heat generated during bearing operation.

Description

Technical Field

[0001] The invention belongs to the technical field of bearing manufacturing, and in particular relates to an angular contact ball bearing retainer and an angular contact ball bearing. Background Art

[0002] A bearing cage is a component of a bearing that partially wraps around all or part of the rolling elements and moves with them. It is used to isolate the rolling elements and usually guides the rolling elements and holds them in the bearing. It is an important component of a rolling bearing and its quality has a direct impact on the bearing's accuracy.

[0003] Existing angular contact ball bearing cages, such as Figure 1 As shown, the pocket is designed as a circular through-hole. During bearing operation, the ball rolls circumferentially, coming into contact with the bearing rings and retainer. In existing circular pocket designs, the pocket-ball contact point is located at the ball's maximum circumference. This can cause contact in the forward and backward directions of the ball's motion, resulting in insufficient oil storage space within the pocket, which affects lubrication. Furthermore, since the ball and retainer contact at the pocket's maximum circumference, the retainer can only guide and correct the ball's circumferential displacement, lacking radial guidance.

[0004] like Figure 2 As shown, the prior art also discloses that the retainer pocket is a rectangular or diamond-shaped through hole. In this rectangular pocket design, the pocket ball contact points are all located at the maximum circumference of the ball. The ball may contact the four surfaces of the rectangular pocket in the direction of circumferential movement, but the pocket does not have the ability to guide and correct the displacement of the ball track in the radial direction; at the same time, the sharp corners of the rectangular pocket greatly reduce the cross-sectional area of ​​the retainer load, and are prone to cause stress concentration, thereby damaging the structural strength of the retainer.

[0005] As the market demand for ultra-high-speed bearings becomes increasingly strong, the oil storage capacity of the cage and the ball track guidance correction capability must be effectively improved to enhance the stability of the bearing's ultra-high-speed operation and increase the bearing's life and reliability. Summary of the Invention

[0006] Therefore, the present invention provides an angular contact ball bearing retainer and an angular contact ball bearing, which can overcome the deficiency in the prior art that the pockets of the retainer lack guidance and correction for the radial displacement of the balls therein.

[0007] In order to solve the above problems, the present invention provides an angular contact ball bearing retainer, including an annular frame body, on which a plurality of pockets are constructed, and the plurality of pockets are arranged at intervals along the circumference of the annular frame body, each of the pockets having a radial inner locking opening and a radial outer locking opening, and the annular frame body having a central cylindrical surface concentric with the annular frame body, the central cylindrical surface and the hole wall of the pocket intersecting at a central ring, the pocket wall between the radial inner locking opening and the center ring and the pocket wall between the radial outer locking opening and the center ring are both flared structures, and the flared structure can form a guide correction for the rolling ball in the pocket along the radial direction of the annular frame body.

[0008] In some embodiments, the flared structure is formed by a plurality of inclined surfaces adjacent to each other along the circumference of the pocket.

[0009] In some embodiments, the number of the inclined surfaces is 4.

[0010] In some embodiments, each of the inclined surfaces forms an angle of 40° to 50° with the annular frame in the axial, circumferential and radial directions.

[0011] In some embodiments, two adjacent inclined surfaces have a transition arc at the intersection, and the radius of the transition arc is 4 / 7 to 6 / 7 of the radius of the rolling ball in the pocket.

[0012] In some embodiments, the rolling ball can enter the pocket through the radially outer locking opening when the radially outer locking opening is elastically deformed.

[0013] In some embodiments, the minimum passing distance of the radially outer locking opening is 95% to 97% of the diameter of the ball in the pocket; and / or the minimum passing distance of the radially inner locking opening is 90% to 93% of the diameter of the ball in the pocket.

[0014] In some embodiments, the annular frame is injection molded from a reinforced high-performance engineering plastic composite material.

[0015] In some embodiments, the reinforced high-performance engineering plastic composite material includes a high-performance carbon fiber reinforced thermoplastic polyetheretherketone composite material.

[0016] The present invention also provides an angular contact ball bearing, comprising a retaining frame, wherein the retaining frame is the above-mentioned angular contact ball bearing retaining frame.

[0017] The present invention provides an angular contact ball bearing retainer and an angular contact ball bearing. Since the pocket has a flared structure, it can exert component forces on the balls therein in the axial, circumferential and radial directions of the annular frame, and can simultaneously constrain and guide the axial, circumferential and radial movements of the balls, thereby improving the retainer's ability to correct the ball's movement trajectory, thereby reducing the generation of vibration, noise and frictional heat during the operation of the bearing. At the same time, a grease storage space can be formed at the maximum circumference of the pocket to store more lubricating grease, which is beneficial to improving the lubrication conditions of the balls and increasing the stability and life of the bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of an angular contact ball bearing cage in the prior art;

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of another angular contact ball bearing cage in the prior art;

[0020] Figure 3 Schematic diagram of the three-dimensional structure of an angular contact ball bearing cage in an embodiment of the present invention;

[0021] Figure 4 for Figure 3 Schematic diagram of the definition of the four inclined surfaces at the pocket without arc transition (partial);

[0022] Figure 5 for Figure 3 Schematic diagram of plane definitions at a pocket, where plane A is the cross-section formed by the plane formed by the axial and radial lines of the annular frame through the central axis of the pocket; plane B is the cross-section formed by the plane formed by the axial and circumferential lines of the annular frame through the center of the pocket and is perpendicular to plane A and parallel to the central axis of the annular frame; plane C is the cross-section formed by the plane formed by the circumferential and radial lines of the annular frame through the central axis of the pocket and is perpendicular to plane A, perpendicular to plane B, and perpendicular to the central axis of the annular frame; plane D is a plane at a 45° angle to plane A and parallel to the radial lines of the annular frame;

[0023] Figure 6 for Figure 5 Schematic diagram on plane A;

[0024] Figure 7 for Figure 5 Schematic diagram on the middle B plane;

[0025] Figure 8 for Figure 5 Schematic diagram on the middle C plane;

[0026] Figure 9 for Figure 5 Schematic diagram on the middle D plane.

[0027] The reference numerals indicate:

[0028] 1. Annular frame; 11. Pocket hole; 2. Radial inner locking mouth; 3. Radial outer locking mouth; 4. Inclined surface; 41. First pocket hole inclined surface; 42. Second pocket hole inclined surface; 43. Third pocket hole inclined surface; 44. Fourth pocket hole inclined surface; 5. Transition arc; 6. Lubricating medium retention area. DETAILED DESCRIPTION

[0029] See also Figures 1 to 9 As shown, according to an embodiment of the present invention, an angular contact ball bearing retainer is provided, comprising an annular frame body 1, on which a plurality of pockets 11 are constructed, and the plurality of pockets 11 are arranged at intervals (preferably uniform intervals) along the circumference of the annular frame body 1, each of the pockets 11 having a radially inner locking opening 2 and a radially outer locking opening 3, the annular frame body 1 having a central cylindrical surface concentric with the annular frame body 1, the central cylindrical surface intersecting with the hole wall of the pocket 11 at a central ring, the pocket wall between the radially inner locking opening 2 and the central ring and the pocket wall between the radially outer locking opening 3 and the central ring are both flared structures, and the flared structure can form a guide correction for the rolling ball in the pocket 11 along the radial direction of the annular frame body 1. In this technical solution, since the pocket 11 has a flared structure, it can exert force on the ball therein in the axial, circumferential and radial directions of the annular frame 1, and can simultaneously constrain and guide the axial, circumferential and radial movements of the ball, thereby improving the cage's ability to correct the ball's movement trajectory, thereby reducing the generation of vibration, noise and frictional heat during the operation of the bearing. At the same time, a grease storage space can be formed at the maximum circumference of the pocket 11 (for example, Figure 1 The lubricating medium retention area 6) in the bearing can store more lubricating grease, which is beneficial to improving the lubrication conditions of the balls and increasing the stability and life of the bearings.

[0030] In some embodiments, the flared structure is formed by a plurality of circumferentially adjacent inclined surfaces 4 along the pocket 11. The flared structure formed by these circumferentially adjacent inclined surfaces 4 allows point contact between the outer periphery of the ball and the inclined surfaces 4, thereby reducing friction. This also further increases the storage capacity of the lubricating medium (grease), further improving the lubrication conditions of the ball. In some embodiments, the number of inclined surfaces 4 is four, meaning that a single pocket 11 has eight identical inclined surfaces 4. These inclined surfaces 4 form the inner wall of the pocket 11 into a roughly octahedral symmetrical structure, ensuring relatively balanced forces on the ball in all directions during bearing operation, thereby ensuring the bearing's service life. It should be noted that a greater number of inclined surfaces 4 results in more balanced forces on the ball, but a greater number of inclined surfaces results in more points of contact with the ball, which is detrimental to reducing friction and increasing grease storage space.

[0031] Each of the inclined surfaces 4 forms an angle of 40° to 50° with the annular frame 1 in the axial, circumferential and radial directions. If the inclination angle is too large or too small, the deviation of the component forces in each guiding direction will be too large, which is not conducive to the stable operation of the bearing.

[0032] Two adjacent inclined surfaces 4 have a transition arc 5 at their intersection. The radius of the transition arc 5 is 4 / 7 to 6 / 7 of the radius of the ball in the pocket 11. If the radius of the transition arc 5 is too large, the lubricating medium storage capacity is low, and if it is too small, the lintel width is small, affecting the strength of the cage. The design of the transition arc 5 avoids stress concentration at sharp corners, improves the stress distribution of each cross-section of the cage, and enhances the strength of the cage.

[0033] In some embodiments, the ball can enter the pocket 11 through the radial outer locking mouth 3 when the radial outer locking mouth 3 is elastically deformed. Specifically, the minimum passing distance of the radial outer locking mouth 3 is 95% to 97% of the diameter of the ball in the pocket 11, thereby ensuring that the ball can be reliably located in the pocket 11, and this purpose can be achieved through the elastic deformation of the radial outer locking mouth 3, thereby simplifying the assembly process; correspondingly, the minimum passing distance of the radial inner locking mouth 2 is 90% to 93% of the diameter of the ball in the pocket 11, so as to effectively prevent the ball from escaping from the radial inner locking mouth 2. It should be noted that if the radial inner locking mouth 2 is too large, it will affect the radial guide correction ability of the retaining cage, and if it is too small, the retaining cage will be locked with the inner ring.

[0034] In some embodiments, the annular frame 1 is injection molded using a reinforced high-performance engineering plastic composite material, such as a fiber-reinforced polyphenylene sulfide composite material, a fiber-reinforced nylon 46 composite material, a fiber-reinforced nylon 66 composite material, etc., preferably, a high-performance carbon fiber-reinforced thermoplastic polyetheretherketone composite material is injection molded. The carbon fiber-reinforced thermoplastic polyetheretherketone composite material has the characteristics of high strength, high temperature resistance, low friction, and wear resistance, and can give full play to its performance advantages.

[0035] Existing circular pocket retainers can only correct circumferential deviations of the ball, while the present invention can correct radial, circumferential and axial deviations. At the same time, the present invention has 30-60% more space for storing lubricating medium, and the storage space is located at the largest circumference in front of the rolling direction of the ball, which has a better lubrication effect.

[0036] In a specific embodiment, using the 7008 high-speed, high-precision angular contact ball bearing retainer as an example, pockets 11 are evenly distributed around the circumference of the retainer, extending radially through the retainer. The balls have a diameter of 7.144 mm, a pocket clearance of 0.28 mm, and 19 balls. The inner surface of the retainer pockets 11 consists of a guide plane (also known as the aforementioned inclined surface 4) and a connecting arc surface (also known as the aforementioned transition arc 5) between the planes. The guide plane forms a 45° angle with the axial, circumferential, and radial directions. The radius of the connecting arc surface is 5 / 7 of the ball radius. The outer locking aperture is 96% of the ball diameter, and the inner locking aperture is 92% of the ball diameter. The retainer is injection molded from a high-performance carbon fiber-reinforced thermoplastic polyetheretherketone composite material.

[0037] According to an embodiment of the present invention, there is further provided an angular contact ball bearing, comprising a retainer, wherein the retainer is the above-mentioned angular contact ball bearing retainer.

[0038] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0039] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. An angular contact ball bearing cage, characterized in that: The invention comprises an annular frame (1), wherein a plurality of pockets (11) are constructed on the annular frame (1), wherein the plurality of pockets (11) are arranged at intervals along the circumference of the annular frame (1), and each pocket (11) has a radial inner locking opening (2) and a radial outer locking opening (3). The annular frame (1) has a central cylindrical surface concentric with the annular frame (1), wherein the central cylindrical surface and the hole wall of the pocket (11) intersect at a central ring, and the pocket wall between the radial inner locking opening (2) and the central ring and the radial outer locking opening (3) are intersected. The pocket hole wall between the opening (3) and the center ring is a flared structure, and the flared structure can form a guide correction for the rolling ball in the pocket hole (11) along the radial direction of the annular frame (1); the flared structure is surrounded by a plurality of adjacent inclined surfaces (4) along the circumference of the pocket hole (11), and the number of the inclined surfaces (4) is 4, so that there are 8 identical inclined surfaces (4) in the same pocket hole (11), so that the inner wall of the cavity of the pocket hole (11) forms an octahedral symmetrical structure.

2. The angular contact ball bearing retainer according to claim 1, characterized in that: Each of the inclined surfaces (4) forms an angle of 40° to 50° with the annular frame (1) in the axial, circumferential and radial directions.

3. The angular contact ball bearing retainer according to claim 1, characterized in that: Two adjacent inclined surfaces (4) have a transition arc (5) at the intersection, and the radius of the transition arc (5) is 4 / 7 to 6 / 7 of the radius of the rolling ball in the pocket (11).

4. The angular contact ball bearing retainer according to claim 1, wherein: The rolling ball can enter the pocket (11) through the radially outer locking opening (3) when the radially outer locking opening (3) is elastically deformed.

5. The angular contact ball bearing retainer according to claim 4, characterized in that: The minimum passing distance of the radially outer locking opening (3) is 95% to 97% of the diameter of the ball in the pocket (11); and / or the minimum passing distance of the radially inner locking opening (2) is 90% to 93% of the diameter of the ball in the pocket (11).

6. The angular contact ball bearing retainer according to claim 1, characterized in that: The annular frame (1) is injection-molded using a reinforced high-performance engineering plastic composite material.

7. The angular contact ball bearing retainer according to claim 6, characterized in that: The reinforced high-performance engineering plastic composite material comprises a high-performance carbon fiber reinforced thermoplastic polyetheretherketone composite material.

8. An angular contact ball bearing, comprising a retainer, characterized in that: The retainer is the angular contact ball bearing retainer according to any one of claims 1 to 7.

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