Ultra-large self-aligning ball bearing and retainer thereof

Abstract

The invention belongs to the technical field of bearings, and particularly relates to an ultra-large self-aligning ball bearing and retainers thereof, the bearing comprises an inner ring, two rows of longitudinally split half outer rings, two rows of retainers and a plurality of steel balls; the outer surface of the inner ring is provided with two rows of inner ring raceways, two rows of steel balls are arranged between the inner ring and the two rows of half outer rings, the two rows of steel balls are separated by the two rows of retainers, and an outer space ring is arranged between the two rows of half outer rings; the retainer comprises a plurality of retainer body units, and the whole annular retainer is formed by the plurality of retainer body units; ball pocket holes are uniformly formed in the surface of the end surface of one side of the whole annular retainer formed by the plurality of retainer body units, and the adjacent ball pocket holes are separated by a separation beam; the adjacent frame body units are connected through connecting assemblies. The retainer adopts a split type structure, and is simple to process, high in strength and convenient to install and transport.

Description

Technical Field

[0001] This invention belongs to the field of bearing technology, specifically relating to an ultra-large self-aligning ball bearing and its cage. Background Technology

[0002] Currently, the traditional technical solution for manufacturing self-aligning ball bearing cages is to use an integrated structure. However, large astronomical telescopes need to be equipped with ultra-large self-aligning ball bearing structures. The integrated processing of ultra-large cages is very difficult. At the same time, the excessive weight of the bearings not only increases the load on the main equipment and places higher demands on the design of the support structure, but also hinders the lightweighting of the equipment and brings huge challenges and safety risks to transportation, hoisting and on-site installation. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a weight-reducing and non-integral machining solution for ultra-large self-aligning ball bearings. This significantly reduces manufacturing difficulty, lightens weight, and facilitates bearing installation and maintenance.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an ultra-large self-aligning ball bearing cage, comprising several arc-shaped cage units, the several cage units constituting the entire annular cage; the several cage units are uniformly provided with ball pocket holes on the surface of one end face constituting the entire annular cage, and adjacent ball pocket holes are spaced apart by partition beams; adjacent cage units are connected by connecting components.

[0005] Furthermore, the connecting assembly includes a cage connecting plate and a cage connecting screw. Each cage unit has a cage connecting groove at both ends along the circumferential direction, and the cage connecting groove has several connecting screw holes. The cage connecting grooves at the ends of adjacent cage units are joined together and the cage connecting plate is assembled. The connecting screw holes on the cage connecting plate correspond to the connecting screw holes of the two cage connecting grooves. The cage connecting plate is connected and fixed to two adjacent cage units by the cage connecting screw.

[0006] Furthermore, the frame unit comprises 2-6 units, all of which have the same arc center angle. Alternatively, the frame unit may comprise 3-6 units, with arc center angles ranging from 90 to 120 degrees, ensuring the strength of each individual frame unit.

[0007] Furthermore, the frame unit consists of four units, and the arc center angle corresponding to each frame unit is 90 degrees.

[0008] Furthermore, the frame connecting groove is provided with 3 connecting screw holes, which are arranged in a row. Correspondingly, the retainer connecting plate has 6 connecting screw holes, which are arranged in two rows.

[0009] Furthermore, the frame connecting groove is located axially between the bottom of the ball pocket and the non-pocket end of the cage.

[0010] On the other hand, the present invention discloses an ultra-large self-aligning ball bearing, comprising an inner ring, two longitudinally split rows of semi-outer rings, two rows of the aforementioned cages, and a plurality of steel balls; the outer surface of the inner ring has two rows of inner ring raceways, two rows of steel balls are disposed between the inner ring and the two rows of semi-outer rings, the two rows of steel balls are separated by the two rows of the aforementioned cages, and an outer spacer is disposed between the two rows of semi-outer rings.

[0011] Furthermore, the inner ring, the two rows of half outer rings, and / or the outer spacer ring are provided with weight reduction grooves.

[0012] Furthermore, the weight-reducing groove is a U-shaped groove with rounded corners.

[0013] Furthermore, multiple inner ring weight-reduction grooves are evenly formed on both end faces of the inner ring.

[0014] Furthermore, the inner ring weight-reducing groove is a U-shaped groove with rounded corners.

[0015] Furthermore, multiple semi-outer ring weight reduction grooves are evenly formed on the end faces of the two rows of semi-outer rings, and the semi-outer ring weight reduction grooves extend through the semi-outer rings axially.

[0016] Furthermore, the semi-outer ring weight reduction groove is a U-shaped groove with rounded corners.

[0017] Furthermore, multiple weight-reducing grooves are evenly formed on the end face of the outer spacer, and the weight-reducing grooves extend through the outer spacer along the axial direction.

[0018] Furthermore, the outer spacer ring weight reduction groove is a U-shaped groove with rounded corners.

[0019] Furthermore, the two rows of semi-outer rings and outer spacers are provided with corresponding outer ring connecting screw holes, and the two rows of semi-outer rings and outer spacers are connected and fixed by outer ring connecting screws installed in the outer ring connecting screw holes; multiple semi-outer ring weight reduction grooves are evenly opened on the end face of the two rows of semi-outer rings, and the semi-outer ring weight reduction grooves penetrate the semi-outer rings axially; multiple outer spacer weight reduction grooves are evenly opened on the end face of the outer spacer, and the outer spacer weight reduction grooves penetrate the outer spacer axially; the semi-outer ring weight reduction grooves and the outer spacer weight reduction grooves correspond one-to-one to form a through outer ring weight reduction groove; the outer ring connecting screw holes and the outer ring weight reduction grooves are alternately arranged.

[0020] Furthermore, the two rows of cages are spaced apart.

[0021] Furthermore, the inner surfaces of the two semi-outer rings are symmetrical spherical surfaces.

[0022] The beneficial effects of this invention are: the cage adopts a split structure, which is simple to process and has high strength, and is convenient to install and transport. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the cage structure; Figure 2 for Figure 1 Explosion diagram at point A in the middle; Figure 3 This is a schematic diagram of the bearing structure; Figure 4 This is the main view of the bearing structure; Figure 5 for Figure 4 BB section view; Figure 6 for Figure 4 CC section view; In the picture: 1. Inner ring, 101. Inner ring weight reduction groove; 2. Semi-outer ring, 201. Semi-outer ring weight reduction groove; 3. Cage; 301. Cage unit; 302. Ball pocket hole; 303. Divider beam; 304. Cage connecting plate; 305. Cage connecting screw; 306. Cage connecting groove; 4. Steel balls; 5. Outer spacer ring; 501. Outer spacer ring weight reduction groove; 6. Outer ring connecting screws. Detailed Implementation

[0024] To make the structure and function of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0025] See appendix Figure 1-6 An ultra-large self-aligning ball bearing includes an inner ring 1, two longitudinally split rows of semi-outer rings 2, two rows of cages 3, and a plurality of steel balls 4; the outer surface of the inner ring 1 has two rows of inner ring raceways, and two rows of steel balls 4 are arranged between the inner ring 1 and the two rows of semi-outer rings 2. The two rows of steel balls 4 are separated by two rows of cages 3, and an outer spacer 5 is arranged between the two rows of semi-outer rings 2.

[0026] The cage comprises four arc-shaped frame units 301, each with an arc center angle of 90 degrees, forming the entire annular cage 3. Each of the four frame units 301 has evenly distributed ball-shaped pockets 302 on one end face of the annular cage, with adjacent ball-shaped pockets 302 spaced apart by partition beams 303. Adjacent frame units are connected by a connecting assembly, which includes a cage connecting plate 304 and cage connecting screws 305. Each frame unit is circumferentially... Both ends of the frame have frame connecting grooves 306, and the frame connecting grooves 306 have three connecting screw holes arranged in a row. The frame connecting grooves at the ends of adjacent frame units are joined together and a retainer connecting plate 304 is assembled. The outer surface of the retainer connecting plate 304 does not protrude from the outer circumference of the retainer. The retainer connecting plate 304 has 6 connecting screw holes arranged in two rows, corresponding one-to-one with the connecting screw holes of the frame connecting groove. The retainer connecting plate is connected and fixed to two adjacent frame units by retainer connecting screws 305.

[0027] Based on the above technical solution, it is difficult to machine ultra-large self-aligning ball bearing cages with a diameter of over 1m into a single piece. Therefore, segmented machining is adopted, with three threaded holes at the end of each segment. During assembly, they are fastened with connecting plates and screws. In this embodiment, the entire annular cage consists of four cage units 301, four sets of cage connecting plates 304, and four sets (six screws per set) of cage connecting screws 305.

[0028] Furthermore, the two rows of retainers 3 are spaced apart so as not to interfere with each other.

[0029] Furthermore, the frame connecting groove 306 is located axially between the bottom of the ball pocket and the non-pocket end of the cage. The frame connecting groove does not affect the rotation of the steel ball.

[0030] Furthermore, multiple inner ring weight-reducing grooves 101 are evenly formed on both end faces of the inner ring 1; the inner ring weight-reducing grooves 101 are U-shaped grooves with rounded corners. Multiple semi-outer ring weight-reducing grooves 201 are evenly formed on the end faces of the two rows of semi-outer rings 2, the semi-outer ring weight-reducing grooves 201 extending axially through the semi-outer ring 2, and the semi-outer ring weight-reducing grooves 201 are U-shaped grooves with rounded corners. Multiple outer spacer ring weight-reducing grooves 501 are evenly formed on the end face of the outer spacer ring 5, the outer spacer ring weight-reducing grooves 501 extending axially through the outer spacer ring 5, and the outer spacer ring weight-reducing grooves 501 are U-shaped grooves with rounded corners. The semi-outer ring weight-reducing grooves 201 and the outer spacer ring weight-reducing grooves 501 correspond one-to-one to form a continuous outer ring weight-reducing groove. The two rows of semi-outer rings and outer spacers are provided with corresponding outer ring connecting screw holes. The two rows of semi-outer rings and outer spacers are connected and fixed by outer ring connecting screws 6 installed in the outer ring connecting screw holes. The outer ring connecting screw holes and outer ring weight reduction grooves are alternately arranged.

[0031] Based on the above technical solution, weight-reducing grooves are reasonably opened on the inner ring 1, the semi-outer ring 2, and the outer spacer 3. The core is to ensure the structural strength and integrity of the key stress-bearing areas of the bearing rings. Not only are U-shaped weight-reducing grooves opened to reduce stress concentration, but grooves are also avoided in the main stress-bearing areas such as the steel balls and raceways. Grooves are only opened on the end faces, i.e., the non-stressed or secondary stress-bearing areas of the bearing rings, to minimize the impact on the overall load-bearing capacity. In this embodiment, U-shaped grooves with rounded corners are opened on the end faces of the inner ring, outer ring, and outer spacer to avoid the use of right-angled or sharp-cornered grooves, reducing stress concentration. Grooving on the end faces results in less stress in these areas, thus having a smaller impact on the overall load-bearing capacity of the bearing.

[0032] Furthermore, the inner surfaces of the two semi-outer rings 2 are symmetrical spherical surfaces, which serve to center the object.

[0033] It should be noted that the parts of this invention not described in detail are prior art.

[0034] The above examples are merely preferred embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of the present invention should be considered within the scope of protection of the present invention.

Claims

1. An extra-large self-aligning ball bearing cage, characterized in that: It includes several frame units, which together form the entire annular retainer; each frame unit has evenly distributed ball pockets on the surface of one end face of the entire annular retainer, with adjacent ball pockets spaced apart by partition beams; adjacent frame units are connected by connecting components.

2. The ultra-large self-aligning ball bearing cage according to claim 1, characterized in that: The connecting assembly includes a cage connecting plate and cage connecting screws. Each cage unit has a cage connecting groove at both ends along the circumferential direction. The cage connecting groove has several connecting screw holes. The cage connecting grooves at the ends of adjacent cage units are joined together and the cage connecting plate is assembled. The connecting screw holes on the cage connecting plate correspond to the connecting screw holes of the two cage connecting grooves. The cage connecting plate is connected and fixed to two adjacent cage units by the cage connecting screws.

3. The ultra-large self-aligning ball bearing cage according to claim 1, characterized in that: The frame unit consists of 2-6 units, and all frame units have the same arc center angle.

4. The ultra-large self-aligning ball bearing cage according to claim 1, characterized in that: The frame consists of four units, each with a central arc angle of 90 degrees.

5. An ultra-large self-aligning ball bearing, characterized in that: It includes an inner ring, two longitudinally separated rows of semi-outer rings, two rows of cages as described in any one of claims 1-4, and a plurality of steel balls; the outer surface of the inner ring has two rows of inner ring raceways, two rows of steel balls are arranged between the inner ring and the two rows of semi-outer rings, the two rows of steel balls are separated by the two rows of cages, and an outer spacer is arranged between the two rows of semi-outer rings.

6. The ultra-large self-aligning ball bearing according to claim 5, characterized in that: Multiple inner ring weight reduction grooves are evenly distributed on both end faces of the inner ring; the inner ring weight reduction grooves are U-shaped grooves with rounded corners.

7. The ultra-large self-aligning ball bearing according to claim 5, characterized in that: Multiple semi-outer ring weight reduction grooves are evenly formed on the end faces of the two rows of semi-outer rings, and the semi-outer ring weight reduction grooves extend through the semi-outer rings along the axial direction; the semi-outer ring weight reduction grooves are U-shaped grooves with rounded corners.

8. The ultra-large self-aligning ball bearing according to claim 5, characterized in that: Multiple weight-reducing grooves are evenly formed on the end face of the outer spacer, and the weight-reducing grooves extend through the outer spacer along the axial direction; the weight-reducing grooves are U-shaped grooves with rounded corners.

9. The ultra-large self-aligning ball bearing according to claim 5, characterized in that: The two rows of semi-outer rings and outer spacers are provided with corresponding outer ring connecting screw holes. The two rows of semi-outer rings and outer spacers are connected and fixed by outer ring connecting screws installed in the outer ring connecting screw holes. Multiple semi-outer ring weight reduction grooves are evenly opened on the end face of the two rows of semi-outer rings. The semi-outer ring weight reduction grooves penetrate the semi-outer rings axially. Multiple outer spacer weight reduction grooves are evenly opened on the end face of the outer spacer. The outer spacer weight reduction grooves penetrate the outer spacer axially. The semi-outer ring weight reduction grooves and outer spacer weight reduction grooves correspond one-to-one to form a through outer ring weight reduction groove. The outer ring connecting screw holes and outer ring weight reduction grooves are alternately arranged.

10. The ultra-large self-aligning ball bearing according to claim 5, characterized in that: The two rows of cages are spaced apart; the inner surfaces of the two rows of semi-outer rings are symmetrical spherical surfaces; and weight-reducing grooves are provided on the inner ring, the two rows of semi-outer rings, and / or the outer spacer.

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