Pulling-out tool for end cover bearing

Abstract

The utility model relates to a pulling-out tool for an end cover bearing, and relates to the technical field of locomotive traction motor maintenance. The pulling-out tool comprises the telescopic device, the supporting assembly and the clamping piece, the clamping piece can be inserted into a roller gap of the end cover bearing to be connected with the end cover bearing, when the telescopic device drives the clamping piece to move, the end cover bearing can be moved out of an inner hole of an end cover, and pulling out of the end cover bearing is completed. The outer ring of the bearing does not need to be knocked in the pulling-out process, so that the inner wall of the end cover hole is prevented from being scratched.

Description

Technical Field

[0001] The utility model relates to the technical field of locomotive traction motor maintenance, in particular to a pulling tool for an end cover bearing. Background Art

[0002] When repairing a diesel locomotive, the locomotive traction motor needs to be disassembled and repaired. During the repair process, the bearings at the end cover often need to be removed. The efficient operation of the locomotive traction motor is maintained by replacing new bearings. At the end cover of some locomotive traction motors, NUP bearings are used to support the motor output shaft. NUP bearings are cylindrical roller bearings without inner rings. Since the bearings have no inner ring, the cylindrical rollers directly contact the output shaft, keeping the axis of the output shaft stable.

[0003] Since the bearings are installed tightly, they are difficult to disassemble by manpower, and in related technologies, the bearings are usually removed by a puller.

[0004] For example, patent CN218504426U discloses a bearing disassembly balancing device, which, when in use, uses a top to abut against a transmission shaft installed in the inner hole of the bearing, and uses a bottom foot to hook the lower bottom surface of the bearing, and drives the bottom foot to move upward relative to the top end through a screw structure, thereby moving the bearing relative to the end of the transmission shaft, and then separating the bearing from the transmission shaft. This type of conventional puller is only suitable for separating the bearing from the transmission shaft, and cannot be used to separate the bearing from the end cover hole, and is not suitable for removing the NUP bearing in this application.

[0005] In order to separate the bearing from the end cover hole, patent CN218476634U discloses a bearing disassembly tool, which is applicable to the disassembly of hole bearings. When in use, the adjusting rod is used to hold the housing outside the end cover hole, and the inner ring of the bearing is hooked by the fixing hook. The fixing hook is driven to move vertically relative to the adjusting rod through the screw structure, driving the bearing to move along the end cover hole to achieve the separation of the bearing. However, for NUP bearings without inner rings, due to the lack of inner ring structure, in order to achieve the disassembly effect, the fixing hook is sometimes directly hooked to the outer ring of the bearing, and the fixing hook will scratch the wall of the end cover hole when the bearing is disassembled.

[0006] Some staff members will use crowbars to knock the bearings when disassembling the bearings. For bearings without inner rings, they often choose to knock the outer rings of the bearings. The slightest mistake will scratch the wall of the end cover hole, affecting the quality of maintenance.

[0007] That is to say, the existing disassembly tools are not suitable for disassembly of bearings without inner rings, and it is necessary to provide a disassembly tool that does not damage the end cover hole when disassembling bearings without inner rings. Utility Model Content

[0008] The utility model provides a pulling tool for an end cover bearing, which is used to provide a pulling tool which does not damage the inner wall of the end cover hole when removing the end cover bearing without an inner ring.

[0009] The utility model provides a pulling tool for an end cover bearing, which is used to pull out a cylindrical roller bearing without an inner ring installed at an end cover hole of a motor housing from the end cover hole, and comprises: a telescopic device; a support assembly, the support assembly is connected to the telescopic device, the support assembly comprises a first support block and a second support block arranged at intervals on two opposite sides of the telescopic device; and a clamping piece, the clamping piece comprises a connecting part and a plurality of clamping parts, the outer diameter of the connecting part is smaller than the inner hole diameter of the end cover bearing and is connected to the telescopic device, the clamping parts are arranged at intervals on the outside of the connecting part, and the clamping piece is used to be inserted into the roller gap of the end cover bearing and connected to the end cover bearing; the telescopic device is used to drive the clamping piece to move linearly relative to the support assembly.

[0010] In one embodiment, the clamping parts are arranged at intervals around the axis of the connecting part, the circumferential width of the clamping parts is smaller than the roller clearance of the end cover bearing, and the distance between the end of the clamping part and the axis of the connecting part is greater than the retainer radius of the bearing.

[0011] In one embodiment, the clamping portions are evenly spaced along the circumferential direction, and the number of the clamping portions is equal to the number of roller gaps of the end cover bearing.

[0012] In one embodiment, an accommodating groove is formed between two adjacent clamping parts, and when the clamping part is inserted into the roller gap, the cylindrical roller is partially accommodated in the accommodating groove.

[0013] In one embodiment, the clamping member is detachably connected to the telescopic device.

[0014] In one embodiment, the clamping piece is sleeved on one end of the telescopic device, and the clamping piece is threadedly connected to the telescopic device.

[0015] In one embodiment, the support assembly also includes a support beam connected to the telescopic device, one end of the support beam is connected to the first support block, and the other end of the support beam is connected to the second support block, the first support block and the second support block are symmetrically arranged along the axis of the telescopic device, and the first support block and the second support block are used to support the outside of the motor housing.

[0016] In one embodiment, the support beam is sleeved outside the telescopic device, and the support beam is detachably mounted on the telescopic device via a locking nut.

[0017] In one embodiment, the telescopic device is a hydraulic cylinder.

[0018] In one embodiment, the telescopic device includes a hydraulic body, a support assembly is installed on the hydraulic body, one end of the hydraulic body is connected to a hydraulic operating rod, the other end of the hydraulic body is connected to a hydraulic top, a clamping part is installed on the hydraulic top, and rotating the hydraulic rod can drive the hydraulic top to move linearly relative to the hydraulic body.

[0019] Compared with the prior art, the advantage of the utility model lies in that, when using the extraction tool, the clip part of the clip can be inserted into the roller gap of the end cover bearing, so that the clip is connected to the end cover bearing, and when the telescopic part is extended and retracted, the clip can be driven to move axially along the bearing, and when the clip moves axially, the clip will hook on the bearing retaining frame, driving the end cover bearing to move axially out of the inner hole of the end cover, and when the bearing is extracted, the extraction tool will not touch the hole wall of the end cover, thereby avoiding scratching the inner wall of the end cover hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the main structure of the extraction tool in the embodiment of the utility model;

[0022] Figure 2 It is a left-side structural schematic diagram of an extraction tool in an embodiment of the utility model;

[0023] Figure 3 It is a schematic diagram of the top view of the structure of the clamping member in the embodiment of the utility model;

[0024] Figure 4 It is a structural schematic diagram of the embodiment of the utility model when the clamping piece is inserted into the end cover bearing.

[0025] Reference numerals:

[0026] 1. Telescopic device; 11. Hydraulic main body; 12. Hydraulic operating rod; 13. Hydraulic top;

[0027] 2. Support assembly; 21. Support beam; 22. First support block; 23. Second support block;

[0028] 3. Card connector; 31. Card connector; 32. Connecting portion; 33. Accommodating slot;

[0029] 4. Locking nut;

[0030] 5. End cover bearing; 51. Outer ring; 52. Cylindrical roller; 53. Cage. DETAILED DESCRIPTION

[0031] The utility model will be further described below in conjunction with the accompanying drawings.

[0032] In order to better explain the extraction tool provided by the present application, it is necessary to first explain the extraction object of the present application, the cylindrical roller bearing without inner ring (NUP bearing). The conventional bearing structure includes an inner ring, an outer ring, a cylindrical roller and a cage. Among them, the cage is arranged between the inner ring and the outer ring, and a limiting structure is arranged on the cage to install and limit the cylindrical roller. The inner ring with a stable axis can be flexibly rotated relative to the outer ring by the rolling of the cylindrical roller in the cage. As for the cylindrical roller bearing without inner ring, it does not contain an inner ring structure, but the cylindrical roller is directly in contact with the shaft structure to support the shaft structure.

[0033] Conventional bearings are usually pulled out by hooking the inner ring, which cannot be used to pull out bearings without inner rings. In the prior art, the outer ring of the bearing is often hit by a crowbar to pull the bearing without inner ring out of the end cover hole. In the process of pulling out the bearing, the inner wall of the end cover hole will inevitably be scratched, which will affect the subsequent installation accuracy of the bearing.

[0034] In order to solve the above technical problems, the present application provides a pull-out tool for an end cover bearing, which is used to pull out a cylindrical roller bearing without an inner ring installed at the end cover of a motor housing from an end cover hole.

[0035] like Figure 1 and Figure 2 As shown, the extraction tool includes a telescopic device 1, a support assembly 2 and a clamping member 3, and the support assembly 2 and the clamping member 3 are both installed on the telescopic device 1. Among them, the support assembly 2 is used to abut against the outside of the motor housing, and the clamping member 3 is used to be inserted into the roller gap of the end cover bearing 5 and connected to the end cover bearing 5.

[0036] The telescopic device 1 can move the clamping member 3 along the axial direction of the end cover bearing 5 when the support assembly 2 is against the motor housing. The telescopic device 1 drives the clamping member 3 to move axially, which can drive the end cover bearing 5 to move axially, so as to realize the extraction of the end cover bearing 5. Specifically, as the clamping member 3 moves axially, the clamping member 3 will hook the retaining frame 53 of the end cover bearing 5, and drive the retaining frame 53 to move axially, so as to realize the extraction of the end cover bearing 5.

[0037] The clamping part 31 of the clamping part 3 can be set as a thorn-like structure to be inserted into the roller gap. When in use, it can be placed at the lower end of the bearing, and the support assembly 2 is supported on the upper surface of the motor housing. When the telescopic device moves the clamping part 3 upward, the upper surface of the clamping part 31 hooks the retaining frame of the bearing, thereby driving the bearing to move out of the end cover hole.

[0038] The clamping portion 31 is integrated with the bearing to improve the connection strength between the clamping portion 31 and the connecting portion 32, thereby preventing the clamping portion 31 from breaking when the bearing is pulled.

[0039] Since the clamping member 3 has a plurality of clamping portions 31 arranged at intervals in the circumferential direction, it can be inserted into a plurality of roller gaps of the end cover bearing 5 at the same time, thereby reducing the risk of axial deflection of the end cover bearing 5 during the process of pulling out the end cover bearing 5 .

[0040] like Figure 1 , Figure 3 and Figure 4 As shown, in some implementations, the clamping portion 31 includes a connecting portion 32 connected to the telescopic device 1, the clamping portion 31 is arranged on the outside of the connecting portion 32, and is arranged at intervals around the axis of the connecting portion 32, the outer diameter of the connecting portion 32 is smaller than the inner hole diameter of the end cover bearing 5, the circumferential width of the clamping portion 31 is smaller than the roller clearance of the end cover bearing 5, and the distance between the end of the clamping portion 31 and the axis of the connecting portion 32 is greater than the retaining frame radius of the bearing.

[0041] When in use, the connecting portion 32 can be inserted into the inner hole of the end cover bearing 5, and the clamping portion 31 is inserted into the roller gap of the end cover bearing 5, so as to realize the connection between the clamping member 3 and the end cover bearing 5. The distance between the end of the clamping portion 31 and the axis of the connecting portion 32 is smaller than the inner diameter of the outer ring 51, so as to avoid the clamping portion 31 being too long to be difficult to extend into the inner hole of the end cover bearing 5, and to avoid the clamping portion 31 being too long to scratch the hole wall of the end cover hole.

[0042] Among them, in some implementations, the clamping portion 31 can be configured as follows: Figure 3 and Figure 4 As shown in the fixed length, in other implementations, the clip part 31 can also be set as a retractable structure. By shortening the clip part 31, the difficulty of inserting the clip 3 into the inner hole of the bearing is reduced. After the clip 3 is inserted into the inner hole of the bearing, the clip part 31 is extended so that the clip 31 is inserted into the roller gap, thereby realizing the connection between the clip 3 and the end cover bearing 5.

[0043] In some implementations, the clamping parts 31 are evenly spaced along the circumferential direction on the outside of the clamping part 3, and the number of the clamping parts 31 is equal to the number of roller gaps in the end cover bearing 5. It is possible to insert a clamping part 31 into each roller gap of the end cover bearing 5, and when the extraction tool extracts the bearing, the extraction force borne by various parts of the bearing can be evenly distributed, so that the end cover bearing 5 can be extracted more smoothly.

[0044] like Figure 3 As shown, in some implementations, an accommodating groove 33 is formed between two adjacent clamping parts 31, and when the clamping part 31 is inserted into the roller gap, the cylindrical roller 52 is partially accommodated in the accommodating groove 33. By providing the accommodating groove 33, when the clamping part 31 is inserted into the roller gap, the cylindrical roller 52 is prevented from interfering with the clamping member 3, so that the clamping part 31 can be smoothly inserted into the roller gap.

[0045] like Figure 1As shown, the clamping member 3 is detachably connected to the telescopic device 1. The clamping members 3 of different specifications can be replaced to meet the disassembly work of the end cover bearings 5 ​​of different sizes. The clamping member 3 can be detachably connected to the telescopic device 1 in a clamping manner through a tongue structure. The clamping member 3 can also be detachably connected by inserting into the mounting hole of the telescopic device 1 and locking by a locking screw. Of course, the clamping member 3 can also be detachably connected to the telescopic device 1 by other detachable connection structures, and is not necessarily limited to the clamping or screw locking methods.

[0046] Furthermore, by detachably connecting the clamping member 3 and the telescopic device 1, the clamping member 3 and the telescopic device 1 can be separated before formal disassembly, so that the connecting portion 32 of the clamping member 3 can be inserted into the inner hole of the bearing, and the clamping portion 31 of the clamping member 3 is located at the end of the bearing away from the support assembly 2. Then, the clamping member 3 is connected to the telescopic device 1, and the telescopic device 1 is used to drive the clamping member 3 to move to realize the disassembly of the bearing.

[0047] like Figure 1 and Figure 2 As shown, in some implementations, the clamping member 3 is sleeved outside the telescopic device 1, and the clamping member 3 is threadedly connected to the telescopic device 1. That is, the clamping member 3 is detachably connected to the telescopic device 1 by threaded connection. During installation, the bottom of the telescopic device 1 is inserted into the threaded hole in the clamping member 3, and then the clamping member 3 is screwed to achieve the connection between the clamping member 3 and the telescopic device 1. The installation is relatively simple, and the connection stability is relatively strong.

[0048] Specifically, the center of the support beam 21 is an annular structure sleeved on the telescopic device 1 , and both ends of the annular structure are connected to a rod structure, one of the rod structures is connected to the first support block 22 , and the other rod structure is connected to the second support block 23 .

[0049] like Figure 1 and Figure 2 As shown, in some implementations, the support assembly 2 includes a support beam 21 connected to the telescopic device 1, one end of the support beam 21 is connected to a first support block 22, and the other end of the support beam 21 is connected to a second support block 23, the first support block 22 and the second support block 23 are symmetrically arranged along the axis of the telescopic device 1, and the first support block 22 and the second support block 23 are used to support the outside of the motor housing. The telescopic device 1 is supported by the symmetrically arranged first support block 22 and the second support block 23, so that the telescopic device 1 is more stable when the end cover bearing 5 is pulled by the telescopic device 1.

[0050] like Figure 1 as well as Figure 2As shown, in some implementations, the support beam 21 is sleeved outside the telescopic device 1, and the support beam 21 is detachably mounted on the telescopic device 1 through the locking nut 4. Specifically, the telescopic device 1 includes a first shaft segment and a second shaft segment that are connected to each other, wherein the outer diameter of the second shaft segment is larger than the outer diameter of the first shaft segment, the support beam 21 can be sleeved outside the first shaft segment and abut against the end of the second shaft segment, and the locking nut 4 is sleeved on the first shaft segment to clamp the support beam 21 between the second shaft segment and the locking nut 4, thereby locking the support beam 21.

[0051] The support beam 21 can be unlocked by screwing the locking nut 4, so that the support beam 21 can be easily rotated around the telescopic device 1 to adjust the positions of the first support block 22 and the second support block 23. In addition, the support assembly 2 can be removed from the telescopic device 1 before use to reduce the space occupied by the extraction tool and facilitate carrying.

[0052] In some implementations, a support beam 21 with a telescopic function may be used, and the distance between the first support block 22 and the second support block 23 may be increased by extending the support beam 21, so that the support assembly 2 can be supported on both sides of an end cap hole with a larger aperture. By contracting the support beam 21, the distance between the first support block 22 and the second support block 23 may be reduced, so that the support assembly 2 occupies less space when it is supported on both sides of an end cap hole with a smaller aperture.

[0053] In some implementations, the telescopic device 1 is a hydraulic cylinder, which can generate a large traction force to avoid manual pulling and reduce the labor intensity of the extraction work. In other implementations, the telescopic device 1 can also be a screw structure, and the linear movement of the clamping member 3 is achieved through the screw and a slider installed on the screw.

[0054] like Figure 1 and Figure 2 As shown, in some implementations, the telescopic device 1 includes a hydraulic body 11, the support assembly 2 is installed on the hydraulic body 11, one end of the hydraulic body 11 is connected to a hydraulic operating rod 12, the other end of the hydraulic body 11 is connected to a hydraulic top 13, the clamping member 3 is installed on the hydraulic top 13, and rotating the hydraulic rod can drive the hydraulic top 13 to move linearly relative to the hydraulic body 11.

[0055] That is to say, the extraction tool can drive the clamping member 3 and the end cover bearing 5 to move by rotating the hydraulic operating rod 12. Similar to the structure of a jack, the operation is simple. Specifically, the end cover bearing 5 can be extracted by rotating the hydraulic operating rod 12 upward or downward in a vertical plane.

[0056] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A pull-out tool for an end cover bearing, which is used to pull out a cylindrical roller bearing without an inner ring installed at an end cover hole of a motor housing, characterized in that: It includes: Telescopic device; A support assembly, the support assembly is connected to the telescopic device, the support assembly includes a first support block and a second support block spaced apart on two opposite sides of the telescopic device; and A clamping member, the clamping member comprises a connecting portion and a plurality of clamping portions, the outer diameter of the connecting portion is smaller than the inner hole diameter of the end cover bearing and is connected to the telescopic device, the clamping portions are arranged at intervals on the outside of the connecting portion, and the clamping member is used to be inserted into the roller gap of the end cover bearing and connected to the end cover bearing; The telescopic device is used to drive the clamping member to move linearly relative to the supporting assembly.

2. The extraction tool according to claim 1, characterized in that The clamping parts are arranged at intervals around the axis of the connecting part, the circumferential width of the clamping parts is smaller than the roller clearance of the end cover bearing, and the distance between the end of the clamping part and the axis of the connecting part is larger than the retainer radius of the bearing.

3. The extraction tool according to claim 1 or 2, characterized in that: The clamping parts are arranged evenly at intervals along the circumferential direction, and the number of the clamping parts is equal to the number of roller gaps of the end cover bearing.

4. The extraction tool according to claim 1 or 2, characterized in that: An accommodating groove is formed between two adjacent clamping parts. When the clamping part is inserted into the roller gap, the cylindrical roller part is accommodated in the accommodating groove.

5. The extraction tool according to claim 1, characterized in that The clamping piece is detachably connected to the telescopic device.

6. The extraction tool according to claim 1 or 5, characterized in that: The clamping piece is sleeved on one end of the telescopic device, and the clamping piece is threadedly connected to the telescopic device.

7. The extraction tool according to claim 1, characterized in that The support assembly also includes a support beam connected to the telescopic device, one end of the support beam is connected to the first support block, and the other end of the support beam is connected to the second support block, the first support block and the second support block are symmetrically arranged along the axis of the telescopic device, and the first support block and the second support block are used to support the outside of the motor housing.

8. The extraction tool according to claim 7, characterized in that The support beam is sleeved outside the telescopic device, and the support beam is detachably mounted on the telescopic device through a locking nut.

9. The extraction tool according to claim 1, characterized in that The telescopic device is a hydraulic cylinder.

10. The extraction tool according to claim 9, characterized in that The telescopic device includes a hydraulic body, the support assembly is installed on the hydraulic body, one end of the hydraulic body is connected to a hydraulic operating rod, the other end of the hydraulic body is connected to a hydraulic top, the clamping member is installed on the hydraulic top, and rotating the hydraulic operating rod can drive the hydraulic top to move linearly relative to the hydraulic body.

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