A bearing dismounting tool

Abstract

The application discloses a bearing dismounting tool which is used for dismounting a bearing arranged on a gear box. The bearing dismounting tool comprises an expansion sleeve, a supporting shell and a jacking assembly. One end of the expansion sleeve is connected with the supporting shell, and the other end of the expansion sleeve is used for extending into an inner ring of the bearing and tightly abutting the inner ring of the bearing. The jacking assembly is installed on the supporting shell and comprises an operating end and an output end. The output end is used for abutting the gear box. When the operating end is operated, the output end generates a jacking force relative to the supporting shell and acts on the gear box, so that the supporting shell drives the expansion sleeve and the bearing to move in a direction away from the gear box, and then the bearing is separated from the gear box.

Description

Technical Field

[0001] This application relates to the field of bearing disassembly technology, and more specifically to a bearing disassembly tooling. Background Technology

[0002] In existing mechanical equipment, especially in the transmission systems of various diesel engines, the bearings of the idler gears in gearbox transmissions often adopt an embedded design.

[0003] This design typically involves machining countersunk holes into a cast housing. During assembly, the bearing, including its outer ring, is first cooled and contracted using liquid nitrogen or dry ice, while the housing is heated with a hot air gun to expand its diameter. The temperature difference then creates an interference fit between the bearing and the countersunk hole in the housing. While this installation method is relatively convenient, disassembling the bearing during maintenance presents significant challenges.

[0004] Because the outer ring of the bearing is interference-fitted with the inner bore of the housing, and the inner installation space is extremely limited, almost touching the inner wall of the housing, the narrow inner bore structure makes it almost impossible to accommodate any conventional disassembly tools, making bearing disassembly extremely difficult, and may even damage the housing or bearing due to improper operation. Utility Model Content

[0005] The purpose of this application is to provide a bearing removal tool that enables the bearing to be safely and reliably removed from the gearbox.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: A bearing disassembly fixture is provided for disassembling bearings mounted on a gearbox. The bearing disassembly fixture includes an expansion sleeve, a support housing, and a lifting assembly. One end of the expansion sleeve is connected to the support housing, and the other end is used to extend into the inner ring of the bearing and fit tightly against it. The lifting assembly is mounted on the support housing and includes an operating end and an output end. The output end is used to abut against the gearbox. When the operating end is operated, the output end generates a lifting force relative to the support housing and acts on the gearbox, thereby causing the support housing to move the expansion sleeve and the bearing away from the gearbox, thus removing the bearing from the gearbox.

[0007] As a preferred embodiment, the expansion sleeve is also included, one end of which extends into the expansion sleeve. The support sleeve has a through hole that allows the output end to extend out. The support sleeve is used to radially limit the expansion sleeve so that the expansion sleeve is in a tightened state relative to the inner ring of the bearing.

[0008] As another preferred embodiment, a limiting component is also included, which is located at the connection between the expansion sleeve and the support housing to fill the assembly gap between them.

[0009] Further preferably, the limiting component includes multiple limiting members, which can be independently installed between the expansion sleeve and the support housing to jointly fill the assembly gap between the expansion sleeve and the support housing.

[0010] Preferably, the limiting component has a wedge-shaped surface facing the expansion sleeve; wherein, when the limiting component is installed between the support housing and the expansion sleeve, as the wedge-shaped surface penetrates, the expansion sleeve, the support sleeve, and the support housing are relatively fastened together.

[0011] Preferably, the expansion sleeve includes an integrally formed snap-fit ​​portion and an assembly portion. The assembly portion is used to connect with the support housing, and the snap-fit ​​portion is used to extend into and engage with the inner ring of the bearing. The expansion sleeve has at least one slot, which extends axially from the end of the snap-fit ​​portion to the assembly portion, providing a radially deformable range for the snap-fit ​​portion and the assembly portion.

[0012] Preferably, the outer periphery of the end of the snap-fit ​​part is provided with a barb structure; when the snap-fit ​​part extends into the inner ring of the bearing, the barb structure can pass through the inner ring of the bearing and hook onto its end face.

[0013] Further preferably, the end of the slot is provided with a circular opening.

[0014] Preferably, the lifting assembly includes: a lifting fixing ring for connecting to the support housing; a lifting screw for cooperating with the lifting fixing ring; and a center positioning rod, one end of which is connected to the end of the lifting screw and passes through the expansion sleeve, with the other end abutting against the gearbox. Operating the lifting screw causes the center positioning rod to move axially relative to the lifting fixing ring, thereby keeping the end of the center positioning rod abutting against the gearbox, and ultimately, through a reaction force, causing the support housing and the expansion sleeve to move as a whole away from the gearbox.

[0015] More preferably, the support housing includes a support nut and a support sleeve, the support nut and the support sleeve being fixedly connected; the expansion sleeve is connected to the support nut, and the lifting assembly is connected to the support sleeve.

[0016] Compared with the prior art, the beneficial effects of this application are as follows: By incorporating a radially expandable expansion sleeve and a built-in lifting assembly, a compact and efficient disassembly force application point is created from within the bearing's inner ring space. The bearing disassembly fixture in this application eliminates the need for external access to the operating space, effectively overcoming the bottleneck of using traditional tools due to the narrowness of the housing structure.

[0017] The expansion sleeve can fit tightly against the inner ring of the bearing and provide uniform tension force. Combined with the reverse lifting action generated by the lifting component, the bearing can be pulled out of the countersunk hole of the housing smoothly and easily. This enables safe, non-destructive, and efficient disassembly of interference fit bearings in extremely confined spaces, greatly improving the feasibility and efficiency of maintenance operations. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the bearing disassembly fixture.

[0019] Figure 2 An exploded view of the bearing disassembly fixture.

[0020] Figure 3 This is a schematic diagram of the structure in which the expansion sleeve and the support sleeve are assembled and then inserted into the central positioning rod.

[0021] Figure 4 This is a schematic diagram of the expansion sleeve.

[0022] Figure 5 This is a schematic diagram of the support sleeve.

[0023] Figure 6 This is a schematic diagram of the limit component.

[0024] Figure 7 This is a schematic diagram of the lifting assembly.

[0025] Figure 8 This is a schematic diagram of the structure supporting the shell.

[0026] In the diagram: 1. Bearing disassembly fixture; 2. Bearing; 10. Expansion sleeve; 11. Snap-fit ​​part; 111. Barbed structure; 12. Assembly part; 13. Slot; 14. Circular opening; 20. Support housing; 21. Support nut; 22. Support sleeve; 23. Circumferential knurling; 30. Lifting assembly; 31. Operating end; 32. Output end; 33. Lifting fixing ring; 34. Lifting screw; 35. Center positioning rod; 40. Support sleeve; 41. Through hole; 50. Limiting assembly; 51. Limiting element; 52. Wedge surface. Detailed Implementation

[0027] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0028] In the description of this application, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this application.

[0029] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0030] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0031] In a preferred embodiment, see Figures 1 to 8 This application provides a bearing disassembly fixture 1, which is used to disassemble a bearing 2 mounted on a gearbox. The bearing disassembly fixture 1 includes an expansion sleeve 10, a support housing 20, and a lifting assembly 30. One end of the expansion sleeve 10 is connected to the support housing 20, and the other end is used to extend into the inner ring of the bearing 2 and fit tightly against the inner ring of the bearing 2. The lifting assembly 30 is mounted on the support housing 20 and includes an operating end 31 and an output end 32. The output end 32 is used to abut against the gearbox. When the operating end 31 is operated, the output end 32 generates a lifting force relative to the support housing 20 and acts on the gearbox, thereby causing the support housing 20 to drive the expansion sleeve 10 and the bearing 2 to move away from the gearbox, thereby removing the bearing 2 from the gearbox.

[0032] When disassembling the bearing 2 on the gearbox, first connect one end of the expansion sleeve 10 in the bearing disassembly fixture 1 to the support housing 20 to ensure a secure assembly. Then, holding the support housing 20, align the other end of the expansion sleeve 10 with the inner ring of the bearing 2 on the gearbox and slowly insert it into the inner ring of the bearing 2. At this time, the expansion sleeve 10 is in its initial state, with its outer diameter slightly smaller than the diameter of the inner ring of the bearing 2, so it can smoothly enter the inner ring without excessive friction or compression. After the expansion sleeve 10 is inserted to the preset position, operate the expansion sleeve 10 to expand radially. As the expansion process continues, the outer diameter of the expansion sleeve 10 gradually increases until the outer wall of the expansion sleeve 10 is completely pressed against the inner wall of the inner ring of the bearing 2, thus achieving the connection between the expansion sleeve 10 and the bearing 2. With the inner ring of bearing 2 secured, the expansion sleeve 10 is now stably fitted to the bearing 2, requiring no additional parts replacement. Next, the operating end 31 of the lifting assembly 30 is operated. Under the action of the operating force, the output end 32 of the lifting assembly 30 gradually generates a lifting force relative to the support housing 20, and this lifting force acts directly on the gearbox. Simultaneously, since the expansion sleeve 10 is secured to the inner ring of bearing 2, the support housing 20, under the reaction force of the lifting force, begins to drive the expansion sleeve 10 to move synchronously. The bearing 2, secured by the expansion sleeve 10, also moves away from the gearbox. As the moving distance increases, the connection between bearing 2 and gearbox gradually loosens. Finally, under the continuous action of the support housing 20 and the expansion sleeve 10, bearing 2 is completely dislodged from the gearbox, completing the entire bearing 2 disassembly operation.

[0033] Therefore, during the disassembly of bearing 2, due to the radial expansion characteristics of the expansion sleeve 10, within a certain size range of the inner hole of bearing 2, the tooling does not need to be designed or replaced with special clamping components for bearings 2 of different sizes. This greatly improves the compatibility of the tooling with bearings 2 of different specifications, and enables clamping and adaptation with the inner ring of bearings 2 of different sizes. Subsequently, the disassembly is completed by the lifting action without the need to adjust or replace the overall structure of the tooling. If the inner hole size of bearing 2 exceeds the telescopic range of the expansion sleeve 10, only a larger expansion sleeve 10 needs to be replaced, and the replacement process is relatively convenient.

[0034] Similarly, the bearing disassembly fixture 1 in this application is relatively simple and convenient to operate. It only requires the expansion sleeve 10 to be fixed against the inner ring of the bearing 2, and then the operating end 31 of the lifting assembly 30 can be used to remove the bearing 2 from the gearbox.

[0035] As a preferred embodiment, it also includes a support sleeve 40, one end of which extends into the expansion sleeve 10. The support sleeve 40 is provided with a through hole 41, which allows the output end 32 to extend out. The support sleeve 40 is used to radially limit the expansion sleeve 10 so that the expansion sleeve 10 is in a tightened state relative to the inner ring of the bearing 2.

[0036] Specifically, due to the support sleeve 40, when the expansion sleeve 10 is inserted into the inner ring of the bearing 2, the expansion sleeve 10 is in its initial state. At this time, the support sleeve 40 is installed into the expansion sleeve 10. Through the initial positioning of the expansion sleeve 10 in conjunction with the support sleeve 40, the expansion sleeve 10 expands radially, gradually increasing the insertion depth of the support sleeve 40 until the outer wall of the expansion sleeve 10 is completely pressed against the inner wall of the inner ring of the bearing 2, forming a stable tightened state. By extending into the expansion sleeve 10 and forming a radial limit, the support sleeve 40 can effectively prevent the expansion sleeve 10 from radially contracting after tightening due to external forces such as the weight of the bearing 2 and the lifting force, or due to its own elastic characteristics. This ensures that the expansion sleeve 10 always maintains a tight and compressed state with the inner ring of the bearing 2, improving the stability and reliability of the bearing 2 disassembly process.

[0037] As another preferred option, a limiting component 50 is also included. The limiting component 50 is disposed at the connection between the expansion sleeve 10 and the support housing 20 to fill the assembly gap between the two, so as to ensure the coaxiality of the expansion sleeve 10 and the support housing 20.

[0038] The limiting component 50 includes multiple limiting members 51, which can be independently installed between the expansion sleeve 10 and the support housing 20 to jointly fill the assembly gap between the expansion sleeve 10 and the support housing 20.

[0039] Specifically, a ring of assembly gap is formed at the connection between the expansion sleeve 10 and the support housing 20. If directly connected, the expansion sleeve 10 is prone to tilting relative to the support housing 20 during subsequent operations, affecting the stability of disassembly. Therefore, multiple independent limiting parts 51 in the limiting assembly 50, such as arc-shaped gaskets, are used to select an appropriate number of limiting parts 51 according to the size of the gap, and they are embedded one by one into the assembly gap between the expansion sleeve 10 and the support housing 20. In the actual assembly process, the first limiting part 51 can be attached to a certain position in the gap, and it can be gently pushed by hand to confirm that it is in close contact with the outer walls of both. Then, the second and third limiting parts 51 are installed in symmetrical positions in the gap to ensure that all limiting parts 51 are evenly distributed around the gap and fill the entire gap. After installation, the expansion sleeve 10 and the support housing 20 are gently tapped with a tool to check whether there is no relative shaking and whether the axis is consistent. Then, the tooling assembly is completed.

[0040] Preferred, see Figure 6 The limiting component 50 is provided with a wedge-shaped surface 52, which is positioned towards the expansion sleeve 10. When the limiting component 50 is installed between the support housing 20 and the expansion sleeve 10, the wedge-shaped surface 52 extends further to make the expansion sleeve 10, the support sleeve 40 and the support housing 20 relatively fastened.

[0041] Preferred, see Figure 3 and Figure 4The expansion sleeve 10 includes an integrally formed snap-fit ​​portion 11 and an assembly portion 12. The assembly portion 12 is used to connect with the support housing 20, and the snap-fit ​​portion 11 is used to extend into and engage with the inner ring of the bearing 2. The expansion sleeve 10 has at least one slot 13, which extends axially from the end of the snap-fit ​​portion 11 to the assembly portion 12, providing a radially deformable range for the snap-fit ​​portion 11 and the assembly portion 12.

[0042] Preferably, the outer periphery of the end of the snap-fit ​​part 11 is provided with a barb structure 111; when the snap-fit ​​part 11 extends into the inner ring of the bearing 2, the barb structure 111 can pass through the inner ring of the bearing 2 and hook onto its end face.

[0043] Further optimization involves providing a circular opening 14 at the end of the slot 13, which eliminates stress concentration points and prevents the initiation and propagation of cracks, enabling the expansion sleeve 10 to withstand repeated, high-intensity tightening and loosening cycles, thereby reducing maintenance costs and replacement frequency.

[0044] Preferably, the lifting assembly 30 includes: a lifting fixing ring 33 for connecting with the support housing 20; a lifting screw 34 for cooperating with the lifting fixing ring 33; and a center positioning rod 35, one end of which is connected to the end of the lifting screw 34 and passes through the expansion sleeve 10, while the other end is used to abut against the gearbox, thereby fixing the center and providing a fulcrum; wherein, rotating the operating end 31 of the lifting screw 34 causes the center positioning rod 35 to move axially relative to the lifting fixing ring 33, thereby keeping the end of the center positioning rod 35 against the gearbox, and finally, through the reaction force, causing the support housing 20 and the expansion sleeve 10 to move as a whole away from the gearbox, thereby slowly causing the bearing 2 to disengage from the gearbox.

[0045] In a further preferred embodiment, the support housing 20 includes a support nut 21 and a support sleeve 22, with the support nut 21 and the support sleeve 22 fixedly connected; the expansion sleeve 10 is connected to the support nut 21, and the lifting assembly 30 is connected to the support sleeve 22.

[0046] Therefore, the specific workflow for disassembling the bearing 2 on the gearbox using the bearing disassembly fixture 1 in this application is as follows: First, prepare the bearing 2 to be disassembled and its installation environment. Clean the inner ring of the bearing 2, ensuring that its surface is free of oil, rust, or other foreign matter, and check to confirm that there are no burrs, protrusions, or other mechanical damage, so as to provide good conditions for the smooth insertion and uniform tightening of the expansion sleeve 10; select an expansion sleeve 10 with matching specifications according to the size of the inner hole of the bearing 2.

[0047] The snap-fit ​​portion 11 of the expansion sleeve 10, with a barb structure 111 at its end, is axially embedded into the inner ring of the bearing 2. During embedding, it is necessary to ensure that multiple barb structures 111 can pass evenly through the inner ring of the bearing 2, and that their hooking planes face the outside of the bearing 2, in preparation for subsequent axial locking. Next, the support sleeve 40 is inserted into the expansion sleeve 10 and pushed to the bottom. The support nut 21 in the support housing 20 is then connected to the assembly portion 12 of the expansion sleeve 10. At this point, an annular gap can be observed between the annular groove of the expansion sleeve 10 or between the assembly portion 12 and the support nut 21. The separate limiting component 50, i.e., multiple limiting members 51, is evenly and sequentially inserted into this gap. During this process, the wedge-shaped surface 52 on the limiting component 50 contacts the expansion sleeve 10, providing a basis for the subsequent radial expansion of the expansion sleeve 10.

[0048] Next, the support sleeve 22 in the support housing 20 is screwed into the installed support nut 21 until it is tightened, thus forming a complete support structure.

[0049] Insert one end of the center positioning rod 35 into the center hole at the end of the lifting screw 34 to complete the connection, and screw the lifting fixing ring 33 into and fix it on the support sleeve 22. Finally, screw the lifting screw 34, which has been connected to the center positioning rod 35, into the threaded hole of the lifting fixing ring 33.

[0050] Adjust the overall position of the bearing disassembly fixture 1 so that the output end 32 of the center positioning rod 35 precisely abuts against the solid housing surface around the mounting hole of the bearing 2 on the gearbox. Rotate the operating end 31 of the lifting screw 34. Initially, it should be turned in slowly. After feeling that the center positioning rod 35 has reached the bottom and obtained a solid reaction force, gradually and evenly increase the rotation torque.

[0051] During this process, the rotational motion of the lifting screw 34 is converted into axial lifting force through the threaded pair. Since the other end of the central positioning rod 35 is already pressed against the gearbox, this lifting force is converted into a reaction force that pushes the entire support housing 20 to move together with the expansion sleeve 10 and the bearing 2 away from the gearbox.

[0052] Under continuous and steady tension, bearing 2 will be slowly pushed out of its mounting seat until it is completely removed. During disassembly, the expansion sleeve 10 expands radially through the compression of the limiting component 50, always keeping it tightly against the inner ring of bearing 2. At the same time, its barb structure 111 provides additional mechanical safety, ensuring the reliability of force transmission and the safe and smooth disassembly process.

[0053] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A bearing disassembly fixture, characterized in that, The bearing disassembly fixture is used to disassemble the bearings installed on the gearbox, and the bearing disassembly fixture includes: Expansion sleeve, support housing, and lifting assembly; One end of the expansion sleeve is connected to the support housing, and the other end is used to extend into the inner ring of the bearing and can fit tightly against the inner ring of the bearing. The lifting assembly is mounted on the support housing, and the lifting assembly includes an operating end and an output end; The output end is used to abut against the gearbox. When the operating end is operated, the output end generates a lifting force relative to the supporting housing and acts on the gearbox, thereby causing the supporting housing to drive the expansion sleeve and bearing to move away from the gearbox, and thus disengaging the bearing from the gearbox.

2. The bearing disassembly fixture as described in claim 1, characterized in that, It also includes a support sleeve, one end of which extends into the expansion sleeve. The support sleeve has a through hole, which allows the output end to extend out. The support sleeve is used to radially limit the expansion sleeve so that the expansion sleeve is in a tightened state relative to the inner ring of the bearing.

3. The bearing disassembly fixture as described in claim 2, characterized in that, It also includes a limiting component, which is located at the connection between the expansion sleeve and the support housing, and is used to fill the assembly gap between the two.

4. The bearing disassembly fixture as described in claim 3, characterized in that, The limiting assembly includes multiple limiting members, which can be independently installed between the expansion sleeve and the support housing to jointly fill the assembly gap between the expansion sleeve and the support housing.

5. The bearing disassembly fixture as described in claim 3, characterized in that, The limiting component is provided with a wedge-shaped surface, which is positioned facing the expansion sleeve; When the limiting component is installed between the support housing and the expansion sleeve, it penetrates deeper with the wedge-shaped surface to make the expansion sleeve, the support sleeve and the support housing relatively fastened.

6. The bearing disassembly fixture as described in claim 1, characterized in that, The expansion sleeve includes an integrally formed snap-fit ​​portion and an assembly portion. The assembly portion is used to connect with the support housing, and the snap-fit ​​portion is used to extend into and engage with the inner ring of the bearing. The expansion sleeve has at least one slot that extends axially from the end of the snap-fit ​​portion to the assembly portion, providing a radially deformable range for the snap-fit ​​portion and the assembly portion.

7. The bearing disassembly fixture as described in claim 6, characterized in that, The outer periphery of the end of the snap-fit ​​part is provided with a barb structure; when the snap-fit ​​part extends into the inner ring of the bearing, the barb structure can pass through the inner ring of the bearing and hook onto its end face.

8. The bearing disassembly fixture as described in claim 6, characterized in that, The end of the slot has a circular opening.

9. The bearing disassembly fixture as described in any one of claims 1-8, characterized in that, The lifting assembly includes: A lifting and fixing ring, which is used to connect to the supporting housing; A lifting screw, which is connected to the lifting fixing ring; A center positioning rod, one end of which is connected to the end of the lifting screw and passes through the expansion sleeve, and the other end is used to abut against the gearbox; Specifically, by operating the lifting screw, the central positioning rod is moved axially relative to the lifting fixing ring, thereby keeping the end of the central positioning rod against the gearbox, and finally, through the reaction force, the supporting housing and the expansion sleeve are moved as a whole away from the gearbox.

10. The bearing disassembly fixture as described in any one of claims 1-8, characterized in that, The support housing includes a support nut and a support sleeve, wherein the support nut and the support sleeve are fixedly connected; The expansion sleeve is connected to the support nut, and the lifting assembly is connected to the support sleeve.

Images