A dismounting tool for a rear block inner oil seal of a subway axle box bearing

Abstract

The utility model discloses a kind of dismounting tool of subway axle box bearing rear block inner oil seal, including tool sleeve, support mechanism, support mechanism and flat plate tool.The tool sleeve is sleeved in the outer of rear block's middle ring plate.Support mechanism includes three one-to-one corresponding support block inserted in the three insertion holes of tool sleeve and a connecting ring embedded in the arc slot of three support blocks;The bottom of the inner end surface of each support block extends flange inward, so that the flange of three support blocks is inserted into the gap between the bottom surface outside of the bottom ring plate of inner oil seal and the top surface outside of the middle ring plate of rear block.Support mechanism includes three one-to-one corresponding support block arranged in the three notches of tool sleeve, and the top surface of three support blocks has a limit distance h between the bottom surface of rear block.The flat plate tool is inserted in the top inner cavity of the front sleeve of rear block with its bottom surface inside, and it is arranged on rear block in the mode that bottom surface outside and the top surface of front sleeve contact.The utility model can conveniently and quickly dismount inner oil seal from rear block.

Description

Technical Field

[0001] This utility model relates to a disassembly tool for the inner oil seal of the rear retaining plate of a subway axle box bearing. Background Technology

[0002] Currently, all subway axle box bearings in my country are maintenance-free, sealed double-row tapered roller bearings. During operation, in addition to bearing downward pressure, these bearings also need to support the combined torque generated by the bending deformation of the axle and the turning of the vehicle. The stress generated by the operating load is relatively high in the rear retaining ring or the journal portion near the rear retaining ring. The inner oil seal 2 and the rear retaining ring 1 are connected, with the inner diameter of the inner oil seal 2 and the outer diameter of the rear retaining ring 3 being an interference fit. The inner oil seal 2 is press-fitted onto the rear retaining ring 1 (see...). Figure 1 Afterwards, the two cannot be directly separated. After the bearing is used, the rear bumper 1 can be reused, but the inner oil seal 2 needs to be removed from the rear bumper 1. Currently, most methods for removing the inner oil seal use a heating method, which involves placing the rear bumper and the inner oil seal assembly into an induction furnace and heating them, using the principle of thermal expansion and contraction to remove the inner oil seal. This heating method is time-consuming and incurs high labor costs. Utility Model Content

[0003] The purpose of this utility model is to overcome the defects of the prior art and provide a disassembly tool and method for the inner oil seal of the rear guard of a subway axle box bearing. It can conveniently and quickly remove the inner oil seal of the bearing from the rear guard so that the rear guard can be reused.

[0004] The purpose of this utility model is achieved as follows: a disassembly fixture for the inner oil seal of the rear retaining ring of a subway axle box bearing, wherein the rear retaining ring comprises, from front to back, a front ring, a middle ring plate, and a rear ring, the outer diameter of the front ring being smaller than the inner diameter of the rear ring; the outer diameter of the middle ring plate being larger than the outer diameter of the rear ring, and the inner surface of the middle ring plate being higher than the outer surface of the top surface; the axial section of the inner oil seal comprises an inner ring, an outer ring, and a bottom ring plate connecting the bottom of the inner ring and the bottom of the outer ring, forming a U-shape, and the height of the inner ring of the inner oil seal being greater than the height of the outer ring of the inner oil seal, the width of the bottom ring plate of the inner oil seal being greater than the width of the inner surface of the middle ring plate of the rear retaining ring, and the inner ring of the inner oil seal being interference-fitted onto the front ring of the rear retaining ring, so that the bottom ring plate of the inner oil seal sits on the inner surface of the middle ring plate of the rear retaining ring; the disassembly fixture comprises a fixture sleeve, a support mechanism, a support mechanism, and a flat fixture; wherein, The inner diameter of the tooling sleeve is adapted to the outer diameter of the middle ring plate of the rear baffle, and the height of the tooling sleeve is greater than the total height of the rear baffle; three insertion holes are evenly distributed radially on the upper circumference of the tooling sleeve; three slots are opened on the bottom surface of the tooling sleeve that correspond one-to-one with the three insertion holes; the tooling sleeve is fitted over the middle ring plate of the rear baffle. The support mechanism includes three support blocks and a connecting ring. Each support block is basically rectangular and its width is greater than the sum of the thickness of the tooling sleeve and the top width of the middle ring plate of the rear baffle. The inner and outer end faces of the support block are both arc surfaces concentric with the tooling sleeve. The bottom of the inner end face of the support block extends inward with a flange. An arc-shaped groove concentric with the tooling sleeve and with an inner diameter greater than the outer diameter of the tooling sleeve is formed on the outer surface of the top surface of the support block. The three support blocks are inserted into the three insertion holes of the tooling sleeve one by one, and the flanges of the three support blocks extend into the gap between the bottom surface of the bottom ring plate of the inner oil seal and the top surface of the middle ring plate of the rear baffle. The connecting ring is embedded in the arc-shaped groove of the three support blocks. The support mechanism includes three support blocks, each of which is basically rectangular and its width is greater than the sum of the thickness of the tooling sleeve, the width of the middle ring plate of the rear stop, and the thickness of the rear ring. The inner and outer end faces of the support blocks are both arc surfaces concentric with the tooling sleeve. The three support blocks are correspondingly arranged in the three slots of the tooling sleeve, and there is a limiting distance h between the top surface of the three support blocks and the bottom surface of the rear ring of the rear stop. The flat fixture is cylindrical with a stepped bottom surface that is lower on the inside and higher on the outside. The width of the outer bottom surface is adapted to the thickness of the front sleeve of the rear baffle. The flat fixture is installed on the rear baffle with its bottom surface inserted into the top cavity of the front sleeve of the rear baffle and its bottom surface in contact with the top surface of the front sleeve. The flat fixture is in contact with the press head of the press.

[0005] The aforementioned disassembly fixture for the inner oil seal of the rear retaining wall of the subway axle box bearing includes a limiting convex arc with an inner diameter that matches the outer diameter of the fixture sleeve, located at the outer end of the top surface of the support block.

[0006] The aforementioned disassembly fixture for the inner oil seal of the rear retaining wall of the subway axle box bearing includes a T-shaped handle on the outer end face of the support block.

[0007] The disassembly tool for the inner oil seal of the rear retaining section of the subway axle box bearing of this utility model has the following characteristics: 1. Simple structure, easy to manufacture, and low cost; 2. It is easy and quick to operate, saving time and effort and improving work efficiency; 3. The rear deflector will not be damaged when the inner oil seal is removed, so that the rear deflector can be reused. Attached Figure Description

[0008] Figure 1 This is an axial cross-sectional view of the rear end of the subway axle box bearing after the inner oil seal has been installed. Figure 2 This is an axial cross-sectional view of the disassembly tool for the inner oil seal of the rear retaining wall of the subway axle box bearing of this utility model. Figure 3This is a top view of the disassembly fixture for the inner oil seal of the rear retaining wall of the subway axle box bearing according to this utility model. Figure 4 This is an axial cross-sectional view of the tooling sleeve in the disassembly tooling of this utility model; Figure 5a This is an axial cross-sectional view of the support block in the disassembly tooling of this utility model; Figure 5b This is a top view of the support block in the disassembly tooling of this utility model; Figure 6 This is an axial cross-sectional view of the connecting ring in the disassembly fixture of this utility model; Figure 7a This is an axial cross-sectional view of the support block in the disassembly fixture of this utility model; Figure 7b This is a top view of the support block in the disassembly fixture of this utility model. Detailed Implementation

[0009] The present invention will be further described below with reference to the accompanying drawings.

[0010] Please see Figures 1 to 7b The present invention relates to a disassembly fixture for the inner oil seal of the rear retaining of a subway axle box bearing. The rear retaining 1, from front to back, includes a front ring 11, a middle ring plate 12, and a rear ring 13. The outer diameter of the front ring 11 is smaller than the inner diameter of the rear ring 13. The outer diameter of the middle ring plate 12 is larger than the outer diameter of the rear ring 13, and the inner surface of the middle ring plate 12 is higher than the outer surface of the top surface. The axial section of the inner oil seal 2 includes an inner ring 21, an outer ring 22, and a bottom ring plate 20 connected between the bottom of the inner ring 21 and the bottom of the outer ring 22, forming a U-shape. The height of the inner ring 21 of the inner oil seal 2 is greater than the height of the outer ring 22 of the inner oil seal 2. The width of the bottom ring plate 20 of the inner oil seal 2 is greater than the width of the inner surface of the middle ring plate 12 of the rear retaining 1. The inner ring 21 of the inner oil seal 2 is interference-fitted onto the front ring 11 of the rear retaining 1, so that the bottom ring plate 20 of the inner oil seal 2 sits on the inner surface of the middle ring plate 12 of the rear retaining 1.

[0011] This utility model discloses a disassembly fixture for the inner oil seal of the rear retaining wall of a subway axle box bearing, comprising a fixture sleeve 3, a support mechanism, a support mechanism, and a flat fixture 6; wherein... The inner diameter of the tooling sleeve 3 is adapted to the outer diameter of the middle ring plate 12 of the rear stop 1, and the height of the tooling sleeve 3 is greater than the total height of the rear stop 1; three insertion holes 31 are evenly distributed radially around the circumference at 2 / 3 of the height of the tooling sleeve 3; three slots 32 are opened on the bottom surface of the tooling sleeve 3, which correspond one-to-one with the three insertion holes 31; the tooling sleeve 3 is fitted over the middle ring plate 12 of the rear stop 1. The support mechanism includes three support blocks 4A and a connecting ring 4B; each support block 4A is basically rectangular and its width is greater than the sum of the thickness of the tooling sleeve 3 and the top width of the middle ring plate 12 of the rear stop 1. The inner and outer end faces of the support block 4A are both arc surfaces concentric with the tooling sleeve 3. The bottom of the inner end face of the support block 4A extends inward with a flange 40, making the inner end face of the support block 4A L-shaped; a connecting ring 4B is opened on the outer side of the top surface of the support block 4A. The sleeve 3 has a concentric arc-shaped groove 41 with an inner diameter larger than the outer diameter of the tooling sleeve 3. The three support blocks 4A are inserted into the three insertion holes 31 of the tooling sleeve 3 in a corresponding manner, and the flanges 40 of the three support blocks 4A extend into the gap between the bottom surface of the bottom ring plate 20 of the inner oil seal 2 and the top surface of the middle ring plate 12 of the rear stop 1. The connecting ring 4B is embedded in the arc-shaped groove 41 of the three support blocks 4A, so that the three support blocks 4A are connected as one unit through the connecting ring 4B. The support mechanism includes three support blocks 5, each of which is basically rectangular and its width is greater than the sum of the thickness of the tooling sleeve 3, the width of the middle ring plate 12 of the rear stop 1, and the thickness of the rear ring 13. The inner and outer end faces of the support blocks 5 are both arc surfaces concentric with the tooling sleeve 3. A limiting convex arc 51 with an inner diameter that matches the outer diameter of the tooling sleeve 3 is provided on the outer end of the top surface of the support blocks 5. A T-shaped handle 52 in the shape of a horizontal line is provided on the outer end face of the support blocks 5. The bottom surface of the handle 52 is higher than the bottom surface of the support blocks 5 to facilitate the disassembly and assembly of the support blocks 5. The three support blocks 5 are correspondingly arranged in the three slots 32 of the tooling sleeve 3 until the limiting convex arc 51 rests against the outer surface of the tooling sleeve 1, and there is a limiting distance h between the top surface of the support blocks 5 and the bottom surface of the rear ring 13 of the rear stop 1. The support mechanism plays the role of limiting the excessive descent of the rear stop 1, and the limiting distance h should meet the requirement of separation between the rear stop 1 and the inner oil seal 2. The flat fixture 6 is cylindrical with a stepped bottom surface that is lower on the inside and higher on the outside. The width of the outer bottom surface is adapted to the thickness of the front sleeve 11 of the rear stop 1. The flat fixture 6 is installed on the rear stop 1 with its bottom surface inserted into the top cavity of the front sleeve 11 of the rear stop 1 and its bottom surface in contact with the top surface of the front sleeve 11. The flat fixture 6 is in contact with the press head of the press.

[0012] The present invention relates to a tooling for disassembling the inner oil seal of the rear axle box bearing. In use, first, the tooling sleeve 3 is fitted over the middle ring plate 12 of the rear axle box 1. Then, three support blocks 5 are inserted into the three slots 32 of the tooling sleeve 3, one by one. Next, three support blocks 4A are inserted into the three insertion holes 31 of the tooling sleeve 3, one by one. Then, a connecting ring 4B is embedded in the arc-shaped grooves 41 of the three support blocks 4A, connecting the three support blocks 4A together. Finally, the hydraulic press is started, pressing the press onto the top surface of the flat tooling 6, pressing down on the rear axle box 1. Because the bottom of the inner oil seal 2 is supported by the flanges 40 of the three support blocks 4A, the inner oil seal 2 will not move down with the rear axle box 1. This causes the rear axle box 1 to move down relative to the inner oil seal 2, thereby disassembling the inner oil seal 2 from the rear axle box 1.

[0013] The above embodiments are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention and should be defined by the claims.

Claims

1. A disassembly fixture for the inner oil seal of a subway axle box bearing rear retainer, wherein the rear retainer comprises, from front to back, a front ring, a middle ring plate, and a rear ring, wherein the outer diameter of the front ring is smaller than the inner diameter of the rear ring; the outer diameter of the middle ring plate is larger than the outer diameter of the rear ring, and the inner surface of the middle ring plate is higher than the outer surface of the top surface; the axial section of the inner oil seal comprises an inner ring, an outer ring, and a bottom ring plate connecting the bottom of the inner ring and the bottom of the outer ring, forming a U-shape, wherein the height of the inner ring of the inner oil seal is greater than the height of the outer ring of the inner oil seal, and the width of the bottom ring plate of the inner oil seal is greater than the width of the inner surface of the middle ring plate of the rear retainer; the inner ring of the inner oil seal is interference-fitted onto the front ring of the rear retainer, such that the bottom ring plate of the inner oil seal sits on the inner surface of the middle ring plate of the rear retainer; the disassembly fixture comprises a fixture sleeve, a support mechanism, a support mechanism, and a flat fixture; characterized in that... The inner diameter of the tooling sleeve is adapted to the outer diameter of the middle ring plate of the rear baffle, and the height of the tooling sleeve is greater than the total height of the rear baffle; three insertion holes are evenly distributed radially on the upper circumference of the tooling sleeve; three slots are opened on the bottom surface of the tooling sleeve that correspond one-to-one with the three insertion holes; the tooling sleeve is fitted over the middle ring plate of the rear baffle. The support mechanism includes three support blocks and a connecting ring. Each support block is basically rectangular and its width is greater than the sum of the thickness of the tooling sleeve and the top width of the middle ring plate of the rear baffle. The inner and outer end faces of the support block are both arc surfaces concentric with the tooling sleeve. The bottom of the inner end face of the support block extends inward with a flange. An arc-shaped groove concentric with the tooling sleeve and with an inner diameter greater than the outer diameter of the tooling sleeve is formed on the outer surface of the top surface of the support block. The three support blocks are inserted into the three insertion holes of the tooling sleeve one by one, and the flanges of the three support blocks extend into the gap between the bottom surface of the bottom ring plate of the inner oil seal and the top surface of the middle ring plate of the rear baffle. The connecting ring is embedded in the arc-shaped groove of the three support blocks. The support mechanism includes three support blocks, each of which is basically rectangular and its width is greater than the sum of the thickness of the tooling sleeve, the width of the middle ring plate of the rear stop, and the thickness of the rear ring. The inner and outer end faces of the support blocks are both arc surfaces concentric with the tooling sleeve. The three support blocks are correspondingly arranged in the three slots of the tooling sleeve, and there is a limiting distance h between the top surface of the three support blocks and the bottom surface of the rear ring of the rear stop. The flat fixture is cylindrical with a stepped bottom surface that is lower on the inside and higher on the outside. The width of the outer bottom surface is adapted to the thickness of the front sleeve of the rear baffle. The flat fixture is installed on the rear baffle with its bottom surface inserted into the top cavity of the front sleeve of the rear baffle and its bottom surface in contact with the top surface of the front sleeve. The flat fixture is in contact with the press head of the press.

2. The disassembly fixture for the inner oil seal of the rear retaining wall of the subway axle box bearing according to claim 1, characterized in that, The top outer end of the support block is provided with a limiting convex arc whose inner diameter matches the outer diameter of the tooling sleeve.

3. The disassembly fixture for the inner oil seal of the rear retaining wall of the subway axle box bearing according to claim 1 or 2, characterized in that, A T-shaped handle is provided on the outer end face of the support block.

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