Integral inseparable four-point contact ball bearing with sealing structure

Abstract

The utility model relates to the technical field of angular contact ball bearings, in particular to an integrally inseparable four-point contact ball bearing with a sealing structure and a manufacturing method thereof.The integrally inseparable four-point contact ball bearing comprises an inner ring, an outer ring, a retainer and a steel ball, a first groove is formed in the inner wall of the outer ring, a second groove is formed in the outer wall of the inner ring, and the outer ring comprises a first half ring and a second half ring; a clamping structure is arranged between the first half ring and the second half ring, the first half ring and the second half ring are detachably connected through the clamping structure, a mounting cavity is formed between the inner ring and the outer ring, and a sealing assembly used for blocking the mounting cavity is arranged between the inner ring and the outer ring. The detachable connection of the first half ring and the second half ring is realized through the clamping structure, so that the stability of the bearing during use is ensured, meanwhile, the sealing assembly is arranged between the inner ring and the outer ring, the self-sealing function of the bearing is realized, a sealing ring does not need to be additionally mounted outside during use, the mounting steps are simplified, and the cost of the mounting process is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of angular contact ball bearings, and in particular to an integral inseparable four-point contact ball bearing with a sealing structure. Background Art

[0002] Four-point contact ball bearing is a kind of separable bearing, or a set of angular contact ball bearings that can bear bidirectional axial loads. Its inner and outer ring raceways are peach-shaped cross-sections. When there is no load or pure radial load, the steel ball and the ring are in four-point contact, which is the origin of the name.

[0003] The four-point contact ball bearings currently available on the market mainly include the following two structures:

[0004] One is the QJ type with double half inner ring or QJF type with double half outer ring with a contact angle of 35 degrees, where the QJ type with double half inner ring refers to the inner ring separable bearing, and the QJF type with double half outer ring refers to the outer ring separable bearing. Both bearings are open-type bearings without sealing structures. In practical applications, since the above QJ type or QJF type bearings are separable (double half inner ring or double half outer ring) open structures without seals, the double half inner ring or outer ring of the same set of bearings needs to be processed independently during manufacturing, resulting in low overall processing efficiency, and the grooves of the two halves of the inner ring or outer ring are prone to inconsistent dimensions due to processing errors, that is, there are deviations, which affects the accuracy of the assembled product. At the same time, when using this bearing, the double half inner ring or outer ring is easy to fall off, making it difficult to install the bearing sleeve or causing damage to the bearing during installation; and when installing the bearing, it is necessary to additionally arrange a sealing ring on the working part of the external bearing installation, so that the staff also needs to process a structure for installing the sealing ring on the bearing installation part, resulting in a complex structure of the bearing installation part and an increased cost of use.

[0005] The second is a thin-walled inseparable sealed four-point contact ball bearing with a contact angle of 30°. The contact angle of this bearing is relatively small, and because the inner and outer rings are of an integral structure, there is a limitation on the ball adding angle like a deep groove ball bearing, which results in a relatively small number of steel balls that can be loaded on the bearing. As mentioned above, since the contact angle of the thin-walled inseparable sealed four-point contact ball bearing is relatively small and the number of steel balls loaded is relatively small, the bidirectional axial force it withstands during use is very small. In order to withstand greater axial forces, larger-sized thin-walled inseparable sealed four-point contact ball bearings are usually used in the prior art, which leads to new problems such as increased specifications of the overall bearing components and increased costs. Utility Model Content

[0006] In order to solve the problem that the existing separable four-point contact ball bearings without seals are processed independently, the overall processing efficiency is low, the product precision is difficult to ensure, and it is inconvenient to use and the installation cost is high, while the thin-walled inseparable four-point contact ball bearings with seals, although with a sealing structure, can only withstand small bidirectional axial force and cannot meet the needs of use, the present application provides an integral inseparable four-point contact ball bearing with a sealing structure.

[0007] The present application provides an integral inseparable four-point contact ball bearing with a sealing structure, which adopts the following technical solution:

[0008] An integral inseparable four-point contact ball bearing with a sealing structure comprises an inner ring, an outer ring, a retaining frame, and a steel ball rotating on the retaining frame, wherein the inner wall of the outer ring is provided with a first groove, the outer wall of the inner ring is provided with a second groove, and the steel ball rotates in the first groove and the second groove, wherein the outer ring comprises a first half ring and a second half ring, the first half ring and the second half ring are formed by splitting the outer ring formed integrally, and a part of the first groove is located on the first half ring, and the other part of the first groove is located on the second half ring, a clamping structure is provided between the first half ring and the second half ring, the first half ring and the second half ring are detachably connected through the clamping structure, an installation cavity is formed between the inner ring and the outer ring, the retaining frame and the steel ball are both provided in the installation cavity, a sealing assembly for sealing the installation cavity is provided between the inner ring and the outer ring, and the contact angle of the steel ball after loading is 45 degrees.

[0009] By adopting the above technical solution, when processing the bearing, the integrally formed outer ring is processed into a first half circle and a second half circle, and then the first half circle and the second half circle are combined together through a clamping structure, so as to ensure the accuracy of the assembled bearing and the structural stability of the bearing during use. At the same time, it is also convenient to load steel balls during the bearing assembly process, so as to ensure that the number of steel balls loaded is sufficient, and the force provided by the 45-degree contact angle is combined to further increase the overall axial load of the bearing; by pre-processing the sealing component onto the bearing, the bearing as a whole has a self-contained sealing structure, so when using the bearing, there is no need to install a sealing ring on the bearing mounting component, making the overall use more convenient, thereby reducing the installation cost of the bearing during use.

[0010] Preferably, the sealing assembly includes two groups of sealing rings, which are relatively arranged at the two ends of the outer ring in an axial direction, and the inner wall of the outer ring is provided with a clamping groove, the sealing ring is embedded in the clamping groove, the inner wall of the sealing ring abuts against the outer wall of the inner ring, and the installation cavity is formed between the two groups of sealing rings.

[0011] By adopting the above technical solution, two sets of sealing rings are used to respectively block the openings at both ends of the installation cavity during use, thereby ensuring that a sealed space is formed in the installation cavity, thereby ensuring the sealing inside the bearing.

[0012] Preferably, the mounting cavity is filled with a lubricating filler.

[0013] By adopting the above technical solution, during the bearing processing, the lubricating filler is directly filled in the installation cavity, so that the bearing does not need to be lubricated with lubricating oil by the customer during subsequent use, which increases the convenience of use.

[0014] Preferably, the clamping structure comprises a connecting ring, an inner wall of one end of the connecting ring is interference fit with the outer wall of the first half circle, and the other end of the connecting ring is interference fit with the outer wall of the second half circle.

[0015] By adopting the above technical solution, the inner wall of the connecting ring and the outer walls of the first half circle and the second half circle are interference fit during use, that is, the first half circle and the second half circle are connected together by the friction between the inner wall of the connecting ring and the outer walls of the first half circle and the second half circle, which is convenient for processing.

[0016] Preferably, a first guide bevel is provided at one end edge of the first half circle, a second guide bevel is provided at one end edge of the second half circle opposite to the first half circle, and third guide bevels are provided at both end edges of the connecting ring.

[0017] By adopting the above technical solution, when in use, the first guide bevel and the third guide bevel cooperate to facilitate the assembly of the connecting ring and the first half circle together, and the second guide bevel and the third guide bevel cooperate to facilitate the assembly of the second half circle and the connecting ring, thereby achieving the purpose of connecting the first half circle and the second half circle into a whole, and making it easier to install the bearing as a whole.

[0018] Preferably, the inner walls at both ends of the connecting ring are fixed with snap ring protrusions, and the outer walls of the first half circle and the second half circle are provided with snap ring grooves for embedding the snap ring protrusions.

[0019] By adopting the above technical solution, the connection stability between the connecting ring and the first half circle and the second half circle is increased through the cooperation of the snap ring protrusion and the snap ring groove during use, thereby increasing the structural stability of the outer ring after assembly.

[0020] In summary, the present application includes at least one of the following beneficial technical effects:

[0021] 1. When in use, the sealing ring and lubricating filler are pre-assembled into the bearing, which makes the assembled bearing convenient to use and reduces the use cost of the bearing. At the same time, the one-piece outer ring is processed into the first half circle and the second half circle to ensure the overall precision marking of the bearing after assembly, and at the same time increase the number of steel balls loaded. Combined with the structural design of 45-degree contact angle, the axial load bearing capacity of the bearing is further increased, and the practicality of the bearing is improved;

[0022] 2. During assembly, the first half circle and the second half circle are reassembled together through the connecting ring. The overall installation method is simple and convenient, while ensuring the structural stability of the bearing during use;

[0023] 3. When in use, the connection between the connecting ring, the first half circle and the second half circle is more stable through the coordinated use of the snap ring convex and the snap buffer, which is also more conducive to the subsequent use of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an axonometric diagram mainly showing the overall structure in the first embodiment of the present application;

[0025] Figure 2 It is an exploded diagram mainly showing the overall structure in the first embodiment of the present application;

[0026] Figure 3 It is a cross-sectional view mainly showing the internal structure of the bearing in the first embodiment of the present application;

[0027] Figure 4 It is an exploded diagram mainly showing the overall structure in the second embodiment of the present application;

[0028] Figure 5 It is a cross-sectional view mainly showing the internal structure of the bearing in the second embodiment of the present application.

[0029] Figure numerals: 1. inner ring; 11. second groove; 2. outer ring; 21. first half ring; 211. first guide bevel; 22. second half ring; 221. second guide bevel; 23. snap-fit ​​groove; 24. first groove; 25. snap-fit ​​ring groove; 26. embedded groove; 3. retaining frame; 31. pocket; 4. steel ball; 5. mounting cavity; 6. sealing assembly; 61. sealing ring; 7. contact point; 8. snap-fit ​​structure; 81. connecting ring; 811. third guide bevel; 82. snap-fit ​​ring convex. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1 -Attached Figure 5 This application is described in further detail.

[0031] The embodiment of the present application discloses an integral inseparable four-point contact ball bearing with a sealing structure.

[0032] Embodiment 1:

[0033] Reference Figure 1 and Figure 2 , an integral inseparable four-point contact ball bearing with a sealing structure, comprising an inner ring 1, an outer ring 2, a retainer 3 and a steel ball 4, wherein the outer ring 2, the inner ring 1 and the retainer 3 are all integrally formed and then processed through a grinding and super-processing process, and then a circle of ruptures is opened on the outer wall of the outer ring 2 along the circumferential direction, and then the outer ring 2 is treated by a heat treatment stress process, so that the outer ring 2 is broken along the rupture under the action of an external force to form a first half circle 21 and a second half circle 22, and a clamping structure 8 is arranged between the first half circle 21 and the second half circle 22, and the clamping structure 8 is used to clamp the first half circle 21 and the second half circle 22 together.

[0034] Reference Figure 1 and Figure 2 When in use, the outer ring 2 is broken into separate parts by a heat treatment stress process, and the fracture surfaces of the first half circle 21 and the second half circle 22 are non-fixed concave-convex surfaces. Compared with the prior art in which the first half circle 21 and the second half circle 22 are processed separately in an integrated molding manner, it has more obvious advantages: that is, the outer ring 2 is processed by a heat treatment stress process, and the assembly surfaces of the first half circle 21 and the second half circle 22 are higher in precision, which reduces the problem of the assembly surface of the outer ring 2 after the combination being unmatched due to errors in the separate processing; secondly, when reassembled, the assembly surfaces of the first half circle 21 and the second half circle 22 are uneven, so that the friction between the first half circle 21 and the second half circle 22 is large, and the connection effect is better.

[0035] Reference Figure 1 and Figure 2 The clamping structure 8 includes a connecting ring 81. In this embodiment, the connecting ring 81 is made of a hard metal material. The outer wall of the outer ring 2 is provided with an embedding groove 26. The crack between the first half ring 21 and the second half ring 22 is located in the embedding groove 26. When the connecting ring 81, the first half ring 21 and the second half ring 22 are assembled together, the connecting ring 81 is embedded in the embedding groove 26, and the inner wall of the connecting ring 81 and the outer walls of the first half ring 21 and the second half ring 22 are interference fit; when in use, the connecting ring 81 is knocked to be sleeved on the first half ring 21, and then the second half ring 22 is knocked to install the second half ring 22 on the connecting ring 81, so as to realize the assembly between the first half ring 21, the second half ring 22 and the connecting ring 81.

[0036] Reference Figure 2 and Figure 3When the outer ring 2 is broken along the rupture, a first guide bevel 211 is formed at the right edge of the first half ring 21, and a second guide bevel 221 is formed at the left edge of the second half ring 22. A third guide bevel 811 is provided at the inner wall edges of the left and right ends of the connecting ring 81. During the installation of the connecting ring 81, the first guide bevel 211 and the third guide bevel 811 are used to guide the connecting ring 81 to be sleeved on the first half ring 21. The second guide bevel 221 and the third guide bevel 811 are used to guide one end of the second half ring 22 to be inserted into the connecting ring 81, thereby facilitating the assembly of the outer ring 2.

[0037] Reference Figure 2 and Figure 3 The retainer 3 is in the shape of a circular ring as a whole, and a plurality of pockets 31 for installing the steel balls 4 are provided on the side wall of the retainer 3. The plurality of pockets 31 are evenly spaced along the circumference of the retainer 3. A mounting cavity 5 and a groove structure can be formed between the inner ring 1 and the outer ring 2. The retainer 3 and the steel balls 4 are both located in the mounting cavity 5. When in use, the retainer 3 is used to isolate the plurality of steel balls 4, and guide the steel balls 4 to always roll in the groove structure. At the same time, when loading the steel balls 4, the number of loaded steel balls 4 can be changed according to the use requirements, that is, the size of the bidirectional axial force that the bearing needs to withstand. When fully loaded with steel balls 4, the bearing reaches the maximum load bearing capacity, and when fully loaded with steel balls 4, the retainer 3 can be selected not to isolate the steel balls 4.

[0038] Reference Figure 3 The groove structure includes a first groove 24 and a second groove 11. The first groove 24 is formed on the inner wall of the outer ring 2, and the second groove 11 is formed on the outer wall of the inner ring 1. The cross-sections of the first groove 24 and the second groove 11 are both peach-shaped. The upper half of the steel ball 4 is located in the first groove 24, and the lower half of the steel ball 4 is located in the second groove 11. There are two contact points 7 between the steel ball 4 and the inner walls of the first groove 24 and the second groove 11. The angle between the line connecting any one of the contact points 7 and the center of the steel ball 4 and the horizontal plane is 45 degrees, that is, a bearing with a 45-degree contact angle structure is formed; when in use, the 45-degree contact angle in the bearing can withstand a larger axial load, thereby increasing the range of use of the bearing.

[0039] Reference Figure 3 During the processing, the first groove 24 will be formed into two parts as the outer ring 2 is split, one part of the first groove 24 is located on the first half circle 21, and the other part of the first groove 24 is located on the second half circle 22. When the first half circle 21 and the second half circle 22 are reassembled into a complete outer ring 2, the first groove 24 is also reassembled.

[0040] Reference Figure 2 and Figure 3A sealing assembly 6 is provided between the inner ring 1 and the outer ring 2. The sealing assembly 6 is used to block the opening of the installation cavity 5. The sealing assembly 6 includes two groups of sealing rings 61. The two groups of sealing rings 61 are arranged opposite to each other, and the two groups of sealing rings 61 are respectively located on the left and right sides of the retaining frame 3. The inner wall of the outer ring 2 has a clamping groove 23 at both ends. The sealing ring 61 is integrally sleeved on the inner ring 1, and the outer wall of the sealing ring 61 is embedded in the clamping groove 23. At the same time, a lubricating filler, such as lubricating oil, grease, etc., is filled between the two sealing rings 61. In the present embodiment, the lubricating filler is preferably set to grease.

[0041] Reference Figure 2 and Figure 3 When assembling the bearing, the lubricating oil and the sealing ring 61 are directly installed on the bearing. When using the bearing, the user does not need to add the sealing ring 61, nor does the user need to lubricate the bearing with grease from the outside of the bearing, thereby simplifying the use steps of the bearing and reducing the use cost of the bearing.

[0042] The implementation principle of the embodiment of the present application is as follows: when assembling the bearing, first sleeve the retainer 3 on the inner ring 1, and move the retainer 3 axially along the inner ring 1. When the pockets 31 on the retainer 3 are aligned with the second grooves 11 on the inner ring 1, insert the steel balls 4 into the pockets 31 on the retainer 3 one by one, and make the steel balls 4 partially located in the second grooves 11, so as to complete the assembly of the steel balls 4, the retainer 3 and the inner ring 1. Then, move the first half circle 21 and the second half circle 22 to the left and right sides of the inner ring 1 respectively, and then move the first half circle 21 to the right first until it is sleeved on the inner ring 1, and then align the left end of the connecting ring 81 with the right end of the first half circle 21, and pass The connecting ring 81 is pressed onto the first half ring 21, and then the left end of the second half ring 22 is aligned with the right end of the connecting ring 81, and then the left end of the second half ring 22 is inserted into the connecting ring 81 by press-fitting, until the right end face of the first half ring 21 and the left end face of the second half ring 22 abut against each other, and then the outer ring 2 and the inner ring 1 are assembled. Finally, the axial clearance of the bearing is tested. After the axial clearance is qualified, the entire outer ring 2 component can be cleaned, and grease is filled into the installation cavity 5, and then the two sealing rings 61 are press-fitted into the clamping groove 23 to realize the assembly of the bearing. At the same time, the bearing as a whole has its own sealing and lubrication effects, which is convenient for subsequent installation and use.

[0043] The difference between the second embodiment and the first embodiment is that:

[0044] Reference Figure 4 and Figure 5A sealing ring convex is integrally formed on the inner wall of the connecting ring 81, and a snap ring convex 82 is integrally formed on the inner walls of both ends of the connecting ring 81. A snap ring groove 25 is opened on the outer wall of the first half circle 21 and the second half circle 22. When the connecting ring 81, the first half circle 21 and the second half circle 22 are assembled together, the snap ring convex 82 is embedded in the snap ring groove 25, and the sealing ring convex is embedded in the rupture on the outer wall of the outer ring 2; when in use, the structural connection strength between the connecting ring 81 and the first half circle 21 and the second half circle 22 is increased through the cooperation of the snap ring convex 82 and the snap ring groove 25, and the structural connection strength between the first half circle 21 and the second half circle 22 is further increased by embedding the sealing ring convex into the rupture on the outer ring 2, and at the same time, it also plays a positioning role in the installation of the connecting ring 81, avoiding the connecting ring 81 from being biased towards the first half circle 21 or the second half circle 22 during installation, thereby ensuring the structural stability of the bearing after assembly.

[0045] The implementation principle of the embodiment of the present application is as follows: when assembling the bearing, first sleeve the retaining frame 3 on the inner ring 1, and move the retaining frame 3 axially along the inner ring 1. When the pockets 31 on the retaining frame 3 are aligned with the second grooves 11 on the inner ring 1, insert the steel balls 4 into the pockets 31 on the retaining frame 3 one by one, and make the steel balls 4 partially located in the second grooves 11, thereby completing the assembly of the steel balls 4, the retaining frame 3 and the inner ring 1. Then, move the first half circle 21 and the second half circle 22 to the left and right sides of the inner ring 1 respectively, and then move the first half circle 21 to the right until it is sleeved on the inner ring 1, and then align the left end of the connecting ring 81 with the right end of the first half circle 21, and sleeve the connecting ring 81 on the first half circle 21 by knocking, and then move the left end of the second half circle 22 to the right side of the inner ring 1. Align the right end of the connecting ring 81 with the end, and insert the left end of the second half circle 22 into the connecting ring 81 by knocking, until the right end face of the first half circle 21 and the left end face of the second half circle 22 abut against each other, then the assembly of the outer ring 2 and the inner ring 1 can be completed, and at this time, the snap-in ring protrusion 82 is embedded in the corresponding snap-in ring groove 25, and the combination stability of the connecting ring 81, the first half circle 21 and the second half circle 22 is increased through the cooperation of the snap-in ring protrusion 82 and the snap-in ring groove 25. Finally, the axial clearance of the bearing is detected. After the axial clearance is qualified, the entire bearing component can be cleaned, and grease can be filled into the mounting cavity 5, and then the two sealing rings 61 are pressed into the snap-in groove 23 to realize the assembly of the bearing. At the same time, the bearing as a whole has its own sealing and lubrication effects, which is convenient for subsequent use.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An integral inseparable four-point contact ball bearing with a sealing structure, comprising an inner ring (1), an outer ring (2), a retaining frame (3), and a steel ball (4) rotating on the retaining frame (3), wherein the inner wall of the outer ring (2) is provided with a first groove (24), the outer wall of the inner ring (1) is provided with a second groove (11), and the steel ball (4) rotates in the first groove (24) and the second groove (11), characterized in that: The outer ring (2) comprises a first half ring (21) and a second half ring (22), the first half ring (21) and the second half ring (22) are formed by the outer ring (2) formed integrally, and a part of the first groove (24) is located on the first half ring (21), and another part of the first groove (24) is located on the second half ring (22), a clamping structure (8) is arranged between the first half ring (21) and the second half ring (22), and the first half ring (21) and the second half ring (22) are detachably connected through the clamping structure (8), an installation cavity (5) is formed between the inner ring (1) and the outer ring (2), the retaining frame (3) and the steel ball (4) are both arranged in the installation cavity (5), a sealing component (6) for sealing the installation cavity (5) is arranged between the inner ring (1) and the outer ring (2), and the contact angle of the steel ball (4) after loading is 45 degrees.

2. The integral inseparable four-point contact ball bearing with a sealing structure according to claim 1, characterized in that: The sealing assembly (6) comprises two groups of sealing rings (61), the two groups of sealing rings (61) are arranged oppositely at the two ends of the axial direction of the outer ring (2), the inner wall of the outer ring (2) is provided with a clamping groove (23), the sealing ring (61) is embedded in the clamping groove (23), the inner wall of the sealing ring (61) is in contact with the outer wall of the inner ring (1), and the installation cavity (5) is formed between the two groups of sealing rings (61).

3. The integral inseparable four-point contact ball bearing with a sealing structure according to claim 2, characterized in that: The installation cavity (5) is filled with lubricating filler.

4. The integral inseparable four-point contact ball bearing with a sealing structure according to claim 1, characterized in that: The clamping structure (8) comprises a connecting ring (81), the inner wall of one end of the connecting ring (81) being in interference fit with the outer wall of the first half circle (21), and the other end of the connecting ring (81) being in interference fit with the outer wall of the second half circle (22).

5. The integral inseparable four-point contact ball bearing with a sealing structure according to claim 4, characterized in that: A first guide bevel (211) is provided at an edge of one end of the first half circle (21), a second guide bevel (221) is provided at an edge of an end of the second half circle (22) opposite to the first half circle (21), and third guide bevels (811) are provided at edges of both ends of the connecting ring (81).

6. The integral inseparable four-point contact ball bearing with a sealing structure according to claim 5, characterized in that: The inner walls of both ends of the connecting ring (81) are fixed with snap ring protrusions (82), and the outer walls of the first half ring (21) and the second half ring (22) are provided with snap ring grooves (25) for embedding the snap ring protrusions (82).

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