Detachable strut retainer for large heavy-duty bearing

Abstract

The invention discloses a detachable supporting column retainer for a large heavy-duty bearing. The detachable supporting column retainer comprises a left gasket and supporting column integrated piece, a right gasket, a fastening nut and an anti-tripping buckle. The left gasket and supporting column integrated piece comprises a left gasket and a plurality of supporting columns evenly distributed on the left gasket, and the supporting columns comprise cylinder-frustum-thread composite supporting columns and common supporting columns. The left gasket and the supporting column are of an integrated structure, and compared with a split type structure, the integrated structure is beneficial to reducing accumulated errors caused by assembly, guaranteeing the contact state of the roller and the supporting column, enabling the roller to stably and smoothly operate, improving the overall performance of the bearing and prolonging the service life of the bearing. The supporting column retainer is detachable, the bonding effect of the temperature-sensitive bonding glue can be controlled according to the temperature, the supporting column retainer is disassembled in a lossless mode according to the thermal expansion and cold contraction principle, maintenance and replacement of the supporting column retainer and the rollers are facilitated, replacement of the whole retainer and all the rollers is avoided, and cost is saved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of bearing design and manufacturing, and particularly relates to a detachable support cage for large heavy-duty bearings. BACKGROUND

[0002] Large heavy-duty bearings are core components of large mechanical equipment such as mining machinery, engineering machinery and rolling machinery, and are usually served under heavy load conditions. In order to ensure the load capacity of the bearing, a support cage is usually used for large heavy-duty bearings. The conventional support cage is connected by two side washers and a support column, which greatly reduces the distance between the rollers and the rollers, facilitates the assembly of a larger number of rollers on the cage, and thus improves the load capacity of the bearing. The support cage usually includes left and right washers and a plurality of separate support columns. The left and right washers are designed with threaded holes or through holes, and the support columns are designed with threaded structures at both ends or one end. The support column is inserted through the roller, and the left and right washers are connected to form an integrated cage by threaded connection or gap assembly, and then the outer side of the washer and the support column are welded to ensure the bonding strength. Although this connection method ensures the overall strength of the cage, the assembly of the support column at both ends and the washer will accumulate machining and assembly errors, and at the same time, due to the accumulation of welding deformation, the perpendicularity between the support column and the washer will be affected, and the contact state of the roller and the support column will be affected. At the same time, during the service of the bearing, a small part of the rollers will fail first, affecting the use of the entire bearing. The existing welded support cage is not detachable, which is not conducive to the maintenance and replacement of the cage and the rollers. Therefore, a support cage is needed, which is firmly combined with the left and right washers and the support column, has small assembly error between the support column and the washer, and is detachable, which improves the use performance and is conducive to the maintenance and maintenance of the bearing.

[0003] Chinese patent CN201510676597.6 proposes a support roller bearing cage welding method, in which a support column with one end in the shape of a prism and the other end in the shape of a cone is designed. The prism-shaped end is riveted and fixed with one side of the washer with a prism-shaped port, and the conical end is welded and fixed with the corresponding washer with an opening. The support column integrates multiple rollers and the support cage, and welding makes the connection more firm. Although this patent proposes a new type of support cage, it only considers the firm connection of the support column and the washer, and does not consider the state of the assembled cage and the disassembly of the cage, which is not conducive to its maintenance and maintenance.

[0004] Chinese patent CN202310535958.X discloses a hollow support roller bearing cage and its auxiliary machining fixture. The left washer of the cage is connected to the support via a threaded through-hole, while the right washer has at least one movable through-hole and several welded through-holes. The movable through-hole is inserted into one support via an anti-rotation groove, and the remaining supports are welded to the welded through-holes on the washers. This invention allows for the disassembly of the support and rollers within the movable through-holes, facilitating observation of the raceway condition, simplifying later bearing maintenance, and reducing maintenance costs. However, this detachable support only has one roller; the rollers on the welded support cannot be removed. Furthermore, this invention does not solve the problem of deteriorated perpendicularity between the support and washer caused by accumulated machining and assembly errors and welding deformation.

[0005] Chinese patent CN 202010112530.0 discloses a welded support cage for cylindrical roller bearings. The support has threads on its outer end, and a conical surface is provided at the transition point between the support and the external thread. Simultaneously, an annular conical surface is provided at the outer end of the threaded hole of the washer, matching the conical surface to adjust the perpendicularity between the support and the washer after tightening. The conical and annular conical surfaces in this patent are relatively small, with only a small portion extending into the washer, resembling a chamfer. Their primary function is to optimize the perpendicularity between the support and the washer; they bear almost no radial force, meaning they do not support the rollers. Furthermore, this support cage is welded, making disassembly impossible as needed.

[0006] Chinese patent CN 201621215635.4 discloses a rolled composite welded cage bearing, in which the rollers are alternately distributed with hollow and solid rollers, connecting to evenly distributed positioning holes and support holes (through holes) on the cage. The core of this patent lies in the alternating distribution of solid and hollow rollers, combining the advantages of both. However, the connection between the hollow rollers and the supports is not described in detail, only mentioning an interference fit between the support holes and the supports through which the hollow rollers pass. However, based on the cage structure and support diagram, it can be seen that the connection between the supports and the cage is a smooth hole connection (interference fit) on one end and a threaded connection on the other. This connection method lacks anti-loosening performance; based on the title, it can be inferred that welding is still required at the connection point, thus preventing disassembly.

[0007] Chinese patent CN 201020688175.3 proposes a novel split spherical bearing cage, in which the support is configured with a threaded end and a riveted end, passing through a hollow roller and connecting to the cage on both sides. While this type of support has the potential for disassembly, it does not consider disassembly-related issues and has not been implemented. This method of connecting the support and cage is simplistic and insecure, easily loosened by impacts, and prone to stress concentration and breakage at the threaded connection with the washer.

[0008] In summary, existing bearing support cages are mostly modular, meaning the left washer, right washer, and support are all independent units. After assembly, the positional relationships between the left and right washers and the support are easily amplified, resulting in significant errors and affecting the contact state between the rollers and the support. Furthermore, existing bearing support cages often require welding or riveting for fixation after assembly, making them impossible to disassemble, which causes considerable difficulties in the subsequent maintenance and upkeep of the bearing cage and rollers. Summary of the Invention

[0009] The present invention aims to propose a detachable support cage for large heavy-duty bearings. First, it aims to process the support cage parts through different manufacturing methods to reduce assembly relationships, ensure the contact state between the support and the roller, and reduce the accumulation of processing and assembly errors caused by the assembly of the support and the washer. Second, it considers the subsequent maintenance of the support cage, avoids welding methods, and designs a detachable support cage while ensuring the overall strength of the cage.

[0010] To achieve the above objectives, the technical solution of the present invention is as follows:

[0011] A detachable support cage for large heavy-duty bearings includes a left washer integrated with the support, a right washer, a fastening nut, and an anti-disengagement device. The integrated left washer and support assembly includes a left washer and multiple supports evenly distributed on the left washer, with the central axis of each support perpendicular to the plane of the left washer. The supports include cylindrical-frustum-threaded composite supports and ordinary supports. The supports are evenly distributed along the circumference of the left washer, with the same number of ordinary supports distributed between two adjacent cylindrical-frustum-threaded composite supports.

[0012] The right washer is a ring of the same size as the left washer. The ring has conical-cylindrical composite through holes and circular blind holes distributed at the corresponding support mounting positions. The conical-cylindrical composite through holes are assembled with the cylindrical-frustum-threaded composite support, and their number is the same as that of the cylindrical-frustum-threaded composite support. The circular blind holes are assembled with ordinary supports, and their number is the same as that of ordinary circular supports.

[0013] Each of the aforementioned supports is equipped with a roller, and the right end of the support after roller assembly is fitted with a right washer. During assembly, the right end of the cylindrical-frustum-threaded composite support passes through the "conical-cylindrical" composite through hole on the right washer and is tightened with a fastening nut. The right end of the ordinary support is inserted into the circular blind hole on the right washer. Furthermore, the left washer and support are integrally formed by 3D printing or integral molding of the blank, followed by precision grinding, with the outer circle of the support being "encircled" by a grinding wheel.

[0014] Furthermore, the number of cylindrical-conical-threaded composite supports on the integral component of the left washer and support is 4-8.

[0015] Furthermore, the cylindrical-frustum-threaded composite support column is divided into three sections from left to right: a cylindrical section, a frustum section, and a threaded cylindrical section. The end of the threaded cylindrical section is provided with an anti-disengagement insertion hole. The "conical-cylindrical" composite through hole on the right washer is divided into two sections from left to right: a conical hole section and a circular hole section.

[0016] Furthermore, the ordinary support column is a cylinder, and during assembly, the end of the ordinary support column is inserted into the circular blind hole in the right washer, with an insertion length of not less than 10 mm.

[0017] Furthermore, during assembly, the cylindrical section of the cylindrical-frustum-threaded composite support passes through the roller, and the frustum section mates with the tapered hole section of the right washer. The diameter of the left part of the frustum section of the cylindrical-frustum-threaded composite support is consistent with the diameter of the left part of the tapered hole section of the right washer, which serves to limit and support the movement. The threaded cylindrical section corresponds to the circular hole section of the right washer, and is tightened by a fastening nut and an anti-disengagement insert is inserted.

[0018] Furthermore, the assembly method of the ordinary support and the circular blind hole on the right washer is an interference fit.

[0019] Furthermore, the diameter of the circular hole on the right washer is larger than that of the fastening nut, leaving room for the fastening tool to rotate. The outer side of the fastening nut protrudes 3-5 mm beyond the outer side of the right washer, and the outer end of the threaded cylindrical section of the cylindrical-cone-threaded composite support protrudes 5-7 mm beyond the outer end of the fastening nut.

[0020] Furthermore, when the ordinary support is interference-fitted with the circular blind hole on the right washer, a temperature-sensitive metal adhesive is applied to the assembly position of the ordinary support and the circular blind hole.

[0021] Furthermore, after the anti-disengagement buckle passes through the anti-disengagement buckle insertion hole, it is fixed by applying temperature-sensitive metal adhesive.

[0022] Furthermore, during maintenance, first heat the anti-disengagement area until the temperature-sensitive metal adhesive fails, then remove the anti-disengagement clip and unscrew the fastening nut at the disassembly / removal point; the disassembly / removal point is the location of the "conical-cylindrical" composite through hole on the right washer. Heat the outer side of the circular blind hole of the right washer, apply a certain external force to separate the left washer from the support assembly and the right washer, and remove the roller for repair or replacement.

[0023] The breakthroughs and beneficial effects achieved by this invention are as follows: 1. The left washer and support of the present invention are an integral structure. Compared with the separate structure, the present invention is conducive to reducing the cumulative error caused by assembly, ensuring the contact state of the roller and the support, making the roller run stably and smoothly, which is conducive to improving the overall performance of the bearing and extending its service life.

[0024] 2. The support cage of the present invention is detachable. The bonding effect of the temperature-sensitive adhesive can be controlled according to the temperature, and the support cage can be disassembled without damage according to the principle of thermal expansion and contraction. This facilitates the maintenance and replacement of the support cage and rollers, avoids the need to replace the entire cage and all rollers, and saves costs.

[0025] 3. The connection between the support and the washer in the support cage of this invention adopts a composite connection method of interference fit, adhesive bonding and threaded connection, which makes the connection more robust. Since welding is not used, it is not affected by welding deformation, which helps to ensure the positional relationship between the support and the washer, and ensures the service performance of the bearing while ensuring the overall strength of the cage. Attached Figure Description

[0026] Figure 1 This is a three-dimensional view of the detachable bearing cage and rollers of the present invention.

[0027] Figure 2 This is a three-dimensional view of the integral left washer and support column of the present invention.

[0028] Figure 3 This is a three-dimensional enlarged view of the integral left washer and support column in this invention.

[0029] Figure 4 This is a partially enlarged planar view of the integral left washer and support column in this invention.

[0030] Figure 5 This is an outer view of the right washer in this invention.

[0031] Figure 6 This is an inner view of the right washer in this invention.

[0032] Figure 7 This is a cross-sectional view of the cage in this invention.

[0033] Figure 8 This is a partially enlarged cross-sectional view of the cage in this invention.

[0034] Figure 9 This is a schematic diagram showing the connection between the cylindrical-conical-threaded composite support column and the "conical-cylindrical" composite through hole in this invention.

[0035] Figure 10 This is a partial sectional view of the "conical-cylindrical" composite through hole in the right washer.

[0036] Figure 11 This is a partial cross-sectional view of the circular blind hole in the right washer.

[0037] In the diagram: 1. Roller; 2. Assembly / disassembly position; 3. Right washer; 4. Left washer and support integrated piece; 5. Cylindrical-conical-threaded composite support; 6. Ordinary support; 7. "Conical-cylindrical" composite through hole; 8. Circular blind hole; 9. Cylindrical section; 10. Conical section; 11. Threaded cylindrical section; 12. Fastening nut; 13. Anti-disengagement; 14. Conical hole section; 15. Circular hole section. Detailed Implementation

[0038] To further aid in understanding a detachable support cage for large, heavy-duty bearings, the invention will be described in detail below with reference to examples.

[0039] like Figures 1 to 11 As shown, a detachable support cage for a large heavy-duty bearing includes a left washer and support integral part 4, a right washer 3, a fastening nut 12, and an anti-disengagement 13. The integrated left washer and support component 4 includes a left washer and multiple supports on the left washer, the central axis of which is perpendicular to the plane of the left washer; the supports include cylindrical-frustum-threaded composite supports 5 and ordinary supports 6. The supports are evenly distributed along the circumference of the left washer, and the same number of ordinary supports 6 are distributed between two adjacent cylindrical-frustum-threaded composite supports 5.

[0040] The right washer 3 is a ring of the same size as the left washer. The ring has conical-cylindrical composite through holes 7 and circular blind holes 8 distributed at the corresponding support mounting positions. The conical-cylindrical composite through holes 7 are assembled with the cylindrical-frustum-threaded composite support 5, and their number is the same as that of the cylindrical-frustum-threaded composite support 5. The circular blind holes 8 are assembled with ordinary support 6, and their number is the same as that of ordinary circular support 6.

[0041] Each of the aforementioned supports is equipped with a roller 1, and the right end of the support after the roller 1 is installed is fitted with a right washer 3. During assembly, the right end of the cylindrical-conical-threaded composite support 5 passes through the "conical-cylindrical" composite through hole 7 on the right washer 3 and is tightened with a fastening nut 12. The right end of the ordinary support 6 is inserted into the circular blind hole 8 on the right washer 3.

[0042] Furthermore, the left washer and the support column integral part 4 are prepared by 3D printing or integral molding and then precision grinding. The outer circle of the support column is "encircled" by a grinding wheel to ensure the processing quality and the perpendicularity between the support column and the left washer.

[0043] Furthermore, the number of cylindrical-conical-threaded composite supports 5 on the integral part 4 of the left washer and support is 4-8.

[0044] Furthermore, the cylindrical-frustum-threaded composite support 5 is divided into three sections from left to right: cylindrical section 9, frustum section 10, and threaded cylindrical section 11. The end of the threaded cylindrical section 11 is provided with an anti-disengagement insertion hole. The “conical-cylindrical” composite through hole 7 on the right washer 3 is divided into two sections from left to right: a conical hole section 14 and a circular hole section 15.

[0045] Furthermore, the ordinary support column 6 is a cylinder, and during assembly, the end of the ordinary support column 6 is inserted into the circular blind hole 8 in the right washer 3, with an insertion length of not less than 10 mm.

[0046] Furthermore, during assembly, the cylindrical section 9 on the cylindrical-frustum-threaded composite support 5 passes through the roller 1, and the frustum section 10 is assembled with the tapered hole section 14 of the right washer 3. The diameter of the left part of the frustum section 10 of the cylindrical-frustum-threaded composite support 5 is consistent with the diameter of the left part of the tapered hole section 14 of the right washer 3, which serves to limit and support the movement. The threaded cylindrical section 11 corresponds to the circular hole section 15 of the right washer 3, and is tightened by the fastening nut 12 and the anti-disengagement buckle 13 is inserted.

[0047] Furthermore, the assembly method of the ordinary support 6 and the circular blind hole 8 on the right washer 3 is an interference fit.

[0048] Furthermore, the diameter of the circular hole 15 on the right washer 3 is larger than that of the fastening nut 12, leaving room for the fastening tool to rotate. The outer side of the fastening nut 12 protrudes 3~5 mm beyond the outer side of the right washer 3, and the outer end of the threaded cylindrical section 11 of the cylindrical-cone-threaded composite support 5 protrudes 5~7 mm beyond the outer end of the fastening nut 12.

[0049] Furthermore, when the ordinary support 6 is interference-fitted with the circular blind hole 8 on the right washer 3, a temperature-sensitive metal adhesive is applied to the assembly position of the ordinary support 6 and the circular blind hole 8.

[0050] After the anti-disengagement buckle 13 passes through the anti-disengagement buckle insertion hole, it is fixed by applying temperature-sensitive metal adhesive.

[0051] Thermosensitive metal adhesives have the characteristic of bonding at low temperatures but failing at high temperatures.

[0052] Furthermore, during maintenance, first heat the anti-disengagement clip 13 until the temperature-sensitive metal adhesive fails, then remove the anti-disengagement clip 13 and unscrew the fastening nut 12 at the assembly / disassembly position 2; the assembly / disassembly position 2 is the location of the "conical-cylindrical" composite through hole 7 on the right washer 3. Heat the outer side of the circular blind hole 8 of the right washer 3, apply a certain external force to separate the left washer and the support assembly 4 and the right washer 3, and remove the roller 1 for maintenance or replacement.

[0053] The foregoing description illustrates the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A detachable support cage for large, heavy-duty bearings, characterized in that: Includes a left washer and support integrated piece (4), a right washer (3), a fastening nut (12), and an anti-disengagement buckle (13); The left washer and support assembly (4) includes a left washer and multiple supports on the left washer, the central axis of the supports being perpendicular to the plane of the left washer; the supports include cylindrical-frustum-thread composite supports (5) and ordinary supports (6); the supports are evenly distributed along the circumference of the left washer, and the same number of ordinary supports (6) are distributed between two adjacent cylindrical-frustum-thread composite supports (5). The right washer (3) is a ring of the same size as the left washer. The ring has a "conical-cylindrical" composite through hole (7) and a circular blind hole (8) distributed on it corresponding to the support installation position. The "conical-cylindrical" composite through hole (7) is assembled with the cylindrical-frustum-threaded composite support (5), and its number is the same as that of the cylindrical-frustum-threaded composite support (5). The circular blind hole (8) is assembled with the ordinary support (6), and its number is the same as that of the ordinary circular support. Each of the aforementioned pillars is equipped with a roller (1), and the right end of the pillar after the roller (1) is assembled with the right washer (3); during assembly, the right end of the cylindrical-conical-threaded composite pillar (5) passes through the "conical-cylindrical" composite through hole (7) on the right washer (3) and is fastened with the fastening nut (12); the right end of the ordinary pillar (6) is inserted into the circular blind hole (8) on the right washer (3).

2. The detachable support cage for large heavy-duty bearings according to claim 1, characterized in that: The left washer and the support integral part (4) are made by 3D printing or integral molding of the blank and then precision grinding, and the outer circle of the support is "enclosed" by a grinding wheel.

3. The detachable support cage for large heavy-duty bearings according to claim 1, characterized in that: The number of cylindrical-conical-threaded composite supports (5) on the left washer and support integral part (4) is 4-8.

4. The detachable support cage for large heavy-duty bearings according to claim 1, characterized in that: The cylindrical-conical-threaded composite support (5) is divided into three sections from left to right: a cylindrical section (9), a conical section (10), and a threaded cylindrical section (11). The end of the threaded cylindrical section (11) is provided with an anti-disengagement insertion hole. The "conical-cylindrical" composite through hole (7) on the right washer (3) is divided into two sections from left to right: a conical hole section (14) and a circular hole section (15).

5. The detachable support cage for large heavy-duty bearings according to claim 1, characterized in that: The ordinary support (6) is a cylinder. During assembly, the end of the ordinary support (6) is inserted into the circular blind hole (8) in the right washer (3) with an insertion length of not less than 10 mm.

6. The detachable support cage for large heavy-duty bearings according to claim 1, characterized in that: During assembly, the cylindrical section (9) on the cylindrical-cone-thread composite support (5) passes through the roller (1), and the conical section (10) is assembled with the tapered hole section (14) of the right washer (3). The diameter of the left part of the conical section (10) of the cylindrical-cone-thread composite support (5) is consistent with the diameter of the left part of the tapered hole section (14) of the right washer (3), which serves as a limit and support. The threaded cylindrical section (11) corresponds to the circular hole section (15) of the right washer (3), and is tightened by the fastening nut (12) and the anti-disengagement buckle (13) is inserted.

7. The detachable support cage for large heavy-duty bearings according to claim 1, characterized in that: The assembly method of the ordinary support (6) and the circular blind hole (8) on the right washer (3) is an interference fit.

8. The detachable support cage for large heavy-duty bearings according to claim 1, characterized in that: The diameter of the circular hole segment (15) on the right washer (3) is larger than that of the fastening nut (12), leaving room for the fastening tool to rotate. The outer side of the fastening nut (12) protrudes 3~5 mm beyond the outer side of the right washer (3). The outer end of the threaded cylindrical segment (11) of the cylindrical-cone-threaded composite support (5) protrudes 5~7 mm beyond the outer end of the fastening nut (12).

9. The detachable support cage for large heavy-duty bearings according to claim 1, characterized in that: When the ordinary support (6) is press-fitted to the circular blind hole (8) on the right washer (3), a temperature-sensitive metal adhesive is applied to the assembly position of the ordinary support (6) and the circular blind hole (8). After the anti-disengagement buckle (13) passes through the anti-disengagement buckle insertion hole, it is fixed by applying temperature-sensitive metal adhesive.

10. A detachable support cage for large heavy-duty bearings according to claim 1, characterized in that: When performing maintenance, first heat the anti-disengagement buckle (13), and after the temperature-sensitive metal adhesive fails, remove the anti-disengagement buckle (13) and unscrew the fastening nut (12) of the mounting / removal position (2); the mounting / removal position (2) is the position of the "conical-cylindrical" composite through hole (7) on the right washer (3); heat the outside of the circular blind hole (8) of the right washer (3), apply a certain external force to separate the left washer and the support assembly (4) and the right washer (3), and remove the roller (1) for maintenance or replacement.

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