Protective fixture for roller bearing removal

Abstract

This invention provides a protective fixture for retracting roller bearings. The bearing is mounted on a rotor, and its inner end face abuts against an oil seal. The protective fixture for retracting roller bearings includes an inner protective plate and an outer protective plate. The outer protective plate has a ring-shaped structure, is fitted over the rotor, and abuts against the outer end face of the bearing. The inner protective plate has a multi-lobed ring-shaped structure, which wraps around the oil seal. The protective fixture for retracting roller bearings provided by this invention solves the problem that existing bearing retraction processes easily lead to shaft damage.

Description

Technical Field

[0001] This utility model relates to the field of motor maintenance, specifically to a protective tooling for removing roller bearings. Background Technology

[0002] Depending on the bearing's structure, size, and fit, common methods for disassembling the inner ring of a roller bearing include: hammering, pulling, pushing, and thermal disassembly. Different methods are used for different situations. Hammering is suitable for bearings with small interference fits, but may damage the bearing during the process. Pushing generally requires a hydraulic press to force the bearing out of the bearing housing, requiring specific equipment. Thermal disassembly methods generally include induction heating, oil heating, and flame heating, and are commonly used for disassembling bearings with large interference fits; induction heating has wider applicability.

[0003] During advanced overhauls of a certain type of traction motor, the bearings at both ends are essential replacement parts. Removing the roller bearings can only be done using a process combining acetylene heating and tooling pull-out. This method has the following disadvantages: 1) The process is cumbersome, requiring multiple disassemblies and reassemblies of the tooling, resulting in high labor intensity for employees; 2) The pull-out force required during bearing removal is significant, posing certain safety hazards; 3) The temperature of the bearing under acetylene heating is difficult to control and is unsuitable for removing bearings in fire-prohibited environments; 4) The inner ring of the roller bearing is an interference fit with the shaft, making the shaft surface easily damaged during pull-out, sometimes necessitating shaft replacement. With the increasing number of motor overhauls, the proportion of shaft surface scratches is constantly rising, leading to a year-on-year increase in maintenance costs. Utility Model Content

[0004] To address the problem that existing bearing removal processes easily lead to shaft damage, this invention provides a protective fixture for removing roller bearings that solves the aforementioned problem.

[0005] A protective fixture for retracting a roller bearing is disclosed. The bearing is mounted on a rotor, and the inner end face of the bearing abuts against an oil seal. The protective fixture for retracting the roller bearing includes an inner protective plate and an outer protective plate. The outer protective plate is a ring-shaped structure that fits around the rotor and abuts against the outer end face of the bearing. The inner protective plate is a multi-lobed ring-shaped structure that wraps around the oil seal.

[0006] In a preferred embodiment of the protective tooling for roller bearing withdrawal provided by this utility model, the outer protective plate extends radially outward at the end away from the bearing to form an outer retaining edge, and the inner protective plate extends radially inward at the end close to the bearing to form an inner retaining edge.

[0007] In a preferred embodiment of the protective fixture for roller bearing withdrawal provided by this utility model, the bearing includes an inner ring, inner and outer cages disposed on the inner ring, and rollers disposed between the inner and outer cages, but does not include the outer ring.

[0008] In a preferred embodiment of the protective fixture for roller bearing withdrawal provided by this utility model, the outer protective plate abuts against the outer end face of the inner ring of the bearing and does not contact the outer cage, and the inner edge of the inner retainer abuts against the inner cage and does not contact the roller.

[0009] The outer protective plate is a ring structure consisting of two segments joined together. One end of the two segments is connected by a hinge, and the other end is connected by a latch.

[0010] In a preferred embodiment of the protective fixture for roller bearing withdrawal provided by this utility model, the protective fixture further includes a protective sleeve. The protective sleeve is a cup-shaped structure made of flexible material, which is fitted over the end of the rotor and extends to the outer protective plate. The bottom of the protective sleeve is provided with one or more vents.

[0011] Compared with the prior art, the protective fixture for roller bearing withdrawal provided by this utility model has the following beneficial effects:

[0012] 1. The solution provided by this utility model arranges inner and outer protective plates before cutting to provide safety protection when cutting the bearing cage rivets, ensuring that the cutting machine itself, as well as the sparks and dust generated during cutting, will not affect the rotor and oil seal.

[0013] 2. The inner and outer protective plates provided by this utility model have the advantages of simple structure, low cost, light material, and easy assembly and disassembly. Furthermore, their dimensions are easily adjustable, making them convenient for use in the removal of inner rings from roller bearings of different sizes. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the protective fixture used for removing roller bearings.

[0015] The following are the labels in the diagram: Inner protective plate 1, Inner flange 11, Outer protective plate 2, Outer flange 21, Protective sleeve 3, Rotor 4, Bearing 5, Inner bearing ring 51, Inner cage 52, Outer cage 53, Roller 54, Oil seal 6. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0017] Please see Figure 1 This is a schematic diagram of the structure of the protective fixture for roller bearing withdrawal provided by this utility model. It includes an inner protective plate 1, an outer protective plate 2, and a protective sleeve 3.

[0018] The application scenario is the motor shaft end, including rotor 4, bearing 5 and oil seal 6.

[0019] The shaft 5 is interference-fitted onto the rotor 4. The inner side of the bearing 5 is the oil seal 6, and the outer side is the end of the rotor 4. The outer ring of the bearing 5 has been removed, leaving the inner ring 51, inner cage 52, outer cage 53, and rollers 54.

[0020] The inner protective plate 1 surrounds the outer perimeter of the oil seal 6, and at the same time, the inner protective plate 1 extends radially inward from the end near the bearing 5 to form a retaining edge, referred to as the inner retaining edge 11. Both the inner retaining edge 11 and the inner wall of the inner protective plate 1 abut against the oil seal, and the inner edge of the inner retaining edge 11 abuts against the inner cage 52, but does not contact the roller 54.

[0021] For ease of installation, the inner protective panel 1 is designed as a two-part ring structure with symmetrical structure. One end is connected by a hinge, and the other end is connected by a latch.

[0022] The inner protective plate 1 provides complete coverage and protection for the oil seal 6.

[0023] The outer protective plate 2 is an annular structure that fits directly onto the outside of the rotor 4 with a clearance fit and abuts against the outer side of the bearing 5. The outer protective plate 2 only abuts against the inner ring 51 of the bearing and does not contact the outer cage 53, meaning that the outer diameter of the outer protective plate 2 is smaller than the outer diameter of the inner ring 51 of the bearing. The end of the outer protective plate 2 away from the bearing 5 extends radially outward to form a retaining edge, denoted as the outer retaining edge 21.

[0024] The protective sleeve 3 is a cup-shaped structure made of rubber, with a round hole at the bottom as an exhaust port. The protective sleeve 3 is fitted onto the end of the rotor 4.

[0025] The diameter of the section of rotor 4 near the end decreases. The outer protective plate 2 and the bearing 5 are both located on the thicker part of rotor 4. The outer protective plate 2 extends to the conical surface between the two sections, and the protective sleeve 3 also extends from the other end to the conical surface between the two sections.

[0026] The outer protective plate 2 and the protective sleeve 3 provide complete coverage and protection for the rotor 4.

[0027] Methods for removing roller bearings include:

[0028] Step 1: Remove the bearing outer ring. Place an induction coil around the bearing outer ring to heat it, causing it to expand. Then use a puller to remove the bearing outer ring.

[0029] Step 2: Install the protective fixture for roller bearing withdrawal provided by this utility model, including an inner protective plate 1, an outer protective plate 2 and a protective sleeve 3, covering the oil seal 6 and the rotor 4.

[0030] Step 3: Use a handheld cutting machine to cut off all the rivets on one side of the outer cage 53 of the bearing 5, that is, the side near the shaft end, so that the outer cage 53 is separated from the inner cage 52.

[0031] The outer protective plate 2 ensures that the cutting machine will not come into contact with the rotor 4 in the event of operational errors, thus protecting the rotor 4 from damage. The outer protective plate 2 and the outer retaining edge 21 form a groove structure to prevent sparks generated during cutting and falling rivets from contacting the rotor 4. The protective sleeve 3 further protects the ends of the rotor 4, preventing other possible damage to the rotor 4. The inner protective plate 1 protects against dust generated during cutting, ensuring that the oil seal 6 is not damaged.

[0032] Step 4: Remove the protective fixture for removing the roller bearing. Since the outer rivets have been removed, the outer cage 53 can be removed directly. Then, use tools such as a pry bar and hammer to separate the roller 54 from the inner cage 52. Finally, remove the inner cage 52.

[0033] Step 5: At this point, only the inner ring 51 of the bearing remains on the rotor 4. An induction coil is installed on the inner ring 51 of the bearing to heat it and cause it to expand.

[0034] Step 6: Use a puller to pull out the inner ring 51 of the bearing.

[0035] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A protective tool for roller bearing withdrawal, the bearing being mounted to a rotor, and an inner end surface of the bearing abutting an oil seal, characterized by: It includes an inner protective plate and an outer protective plate. The outer protective plate is a ring-shaped structure that fits around the rotor and abuts against the outer end face of the bearing. The inner protective plate is a multi-lobed ring-shaped structure that wraps around the oil seal.

2. The withdrawal guard for a roller bearing as set forth in claim 1, characterized in that: The outer protective plate extends radially outward at the end furthest from the bearing to form an outer retaining edge, and the inner protective plate extends radially inward at the end closest to the bearing to form an inner retaining edge.

3. The withdrawal guard for a roller bearing as set forth in claim 2, characterized in that: The bearing includes an inner ring, inner and outer cages disposed on the inner ring, and rollers disposed between the inner and outer cages, but does not include the outer ring.

4. The guard tool for roller bearing withdrawal according to claim 3, characterized in that: The outer protective plate abuts against the outer end face of the inner ring of the bearing, but does not contact the outer cage. The inner edge of the inner retainer abuts against the inner cage, but does not contact the roller.

5. The guard tool for roller bearing withdrawal according to claim 4, characterized in that: The outer protective plate is a ring structure consisting of two segments joined together. One end of the two segments is connected by a hinge, and the other end is connected by a latch.

6. The withdrawal guard for a roller bearing as set forth in claim 1, wherein: The protective tooling for retracting the roller bearing also includes a protective sleeve, which is a cup-shaped structure made of flexible material, fitted over the end of the rotor and extending to the outer protective plate.

7. The guard tool for roller bearing withdrawal according to claim 6, characterized in that: The bottom of the protective sleeve is provided with one or more vents.

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