Retreating tool for bearing sealing cover of rail transit axle box

Abstract

The utility model discloses a withdrawal tool for a rail transit axle box bearing sealing cover. The withdrawal tool comprises a pressing block and a bottom die. The height of the pressing block is larger than or equal to the distance between the upper end face of the middle space ring and the upper end face of the outer ring plus the height of the upper sealing cover. A plurality of ribs are uniformly distributed on the circumference of the lower part of the peripheral surface of the pressing block, and the diameter of a circle formed by connecting lines of the outer ends of the ribs is smaller than the inner diameter of the upper retainer and is greater than or equal to the outer diameter of the middle space ring; an inner hole of the bottom die is a big-end-up stepped hole, and the lower part of the inner hole is higher than the upper sealing cover; after the loose rib and the inner ring are removed, the lower end face of the outer ring is placed on the step face of the inner hole of the bottom die, the pressing block is inserted into the bearing from the upper portion, and each protruding edge is located between every two adjacent rollers till the bottom face of the pressing block makes contact with the upper end face of the middle space ring; the pressure is applied by a press machine, so that the pressure block transmits force to the middle space ring, the lower roller and the lower retainer in sequence, and then the lower sealing cover is ejected downwards. The utility model does not damage the bearing assembly.

Description

Technical Field

[0001] The utility model relates to a disassembly tool for a rail transit axle box bearing sealing cover. Background Art

[0002] Rail transit axle box bearings are mainly divided into two types: tapered roller bearings and cylindrical roller bearings. Most of the cylindrical roller bearings are split double outer ring and double inner ring cylindrical roller bearings, but there is an integral single outer ring and single inner ring double row cylindrical roller bearing. The wall thickness of the sealing cover of this bearing is thicker than that of other cylindrical roller axle box bearings, and the outer diameter surface of the sealing cover has a large interference with the inner diameter surface of the outer ring, and the inner diameter surface of the outer ring is provided with a groove at both ends, and the lower part of the outer diameter surface of the sealing cover is provided with a limit flange that matches the groove on the outer ring, so that the sealing cover is installed in place and stuck in the groove of the outer ring through the limit flange. When inspecting this type of bearing, it is necessary to withdraw the sealing cover first, and then withdraw the inner components of the bearing from the raceway of the outer ring. If the sealing cover is pried open with a pry bar or other tool, it will cause serious deformation of the sealing cover, and will cause dents and scratches on the rollers, cages and end faces of the inner ring. During the inspection and maintenance of the bearing, it must be ensured that the inner ring, outer ring, roller, cage and other parts are not damaged. The sealing cover may be reused according to customer needs, so it must also be ensured that the sealing cover is not damaged when it is removed. Utility Model Content

[0003] The utility model aims to overcome the defects of the prior art and provide a disassembly tool for a rail transit axle box bearing sealing cover, which can easily realize the disassembly of the bearing sealing cover and will not damage the disassembled bearing assembly.

[0004] The purpose of the utility model is achieved in this way: a disassembly tool for a rail transit axle box bearing sealing cover, the rail transit axle box bearing is a single outer ring single inner ring double row cylindrical roller bearing, the bearing includes an outer ring with upper and lower raceways on the inner diameter surface, an inner ring with no raceway on the outer diameter surface and a retaining edge on the upper end, a flat retaining ring arranged at the lower end of the inner ring, an upper row of rollers arranged in the upper raceway of the outer ring through an upper retaining frame, a lower row of rollers arranged in the lower raceway of the outer ring through a lower retaining frame, and a roller arranged between the inner side of the lower end surface of the upper row of rollers and the inner side of the upper end surface of the lower rollers. The middle spacer ring between the upper and lower retaining frames, the upper sealing cover installed between the inner diameter surface of the outer ring and the outer diameter surface of the inner ring and located above the upper retaining frame, and the lower sealing cover installed between the inner diameter surface of the outer ring and the outer diameter surface of the inner ring and located below the lower retaining frame; the number of upper rollers in a row is the same as the number of lower rollers in a row; the structure and size of the upper retaining frame are the same as those of the lower retaining frame in a one-to-one correspondence; the structure and size of the upper sealing cover are the same as those of the lower sealing cover in a one-to-one correspondence; the unloading tooling includes a pressing block and a bottom mold, wherein,

[0005] The pressing block is a cylinder with a diameter smaller than the outer diameter of the inner ring, and the height of the pressing block is greater than or equal to the distance between the upper end surface of the middle spacer ring and the upper end surface of the outer ring + the height h of the upper sealing cover; a plurality of ridges are evenly distributed on the lower circumference of the outer circumference of the pressing block, and the number of the ridges is the same as the number of upper rollers in a row, and the diameter of the circle formed by the connecting line of the outer ends of the plurality of ridges is smaller than the inner diameter of the cage and greater than or equal to the outer diameter of the middle spacer ring; a press is connected to the top surface of the pressing block;

[0006] The bottom mold is a circular ring, the inner hole of the bottom mold is a stepped hole with a larger upper part and a smaller lower part, the upper inner diameter of the bottom mold is adapted to the outer diameter of the outer ring, the lower inner diameter of the bottom mold is larger than the inner diameter of the outer ring, and the lower height H of the bottom mold is larger than the height h of the upper sealing cover;

[0007] After the flat retaining ring and inner ring of the bearing are removed, the bottom surface of the outer ring of the bearing is placed on the inner hole step surface of the bottom mold, and the pressure block is inserted into the bearing from the top of the bearing, so that each ridge on the pressure block is located one by one between two adjacent rollers of the upper row of rollers, until the bottom surface of the pressure block contacts the upper end surface of the middle spacer ring; pressure is applied by a press machine, so that the pressure block transfers force to the middle spacer ring, the lower rollers and the lower retaining frame in turn, and the lower sealing cover is pushed downward by the lower retaining frame.

[0008] In the above-mentioned removal tool for the rail transit axle box bearing sealing cover, the cross section of the convex ridge on the pressing block is semicircular.

[0009] In the above-mentioned removal tool for the rail transit axle box bearing sealing cover, the pressing block is made of aluminum.

[0010] The utility model is characterized in that the disassembly tooling of the rail transit axle box bearing sealing cover is capable of easily completing the disassembly of the bearing with only two components and a press, and when the sealing cover is removed, it is ensured that the inner and outer rings, rollers, retaining frames, intermediate spacer rings and other parts will not produce scratches, bumps and the like, which is convenient for subsequent bearing maintenance, and the removed sealing cover will not be deformed, so that the sealing cover can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is an axial cross-section of a rail transit axle box bearing;

[0012] Figure 1a yes Figure 1 Enlarged view of the middle P site;

[0013] Figure 2 It is an axial cross-sectional view of the disassembly tool of the rail transit axle box bearing sealing cover of the utility model;

[0014] Figure 3a This is a front view of the pressing block in the unloading tool of the utility model;

[0015] Figure 3b yes Figure 3a A top view of

[0016] Figure 4 It is an axial cross-sectional view of the dismantling tool of the utility model after the lower sealing cover is dismantled;

[0017] Figure 5 It is an axial cross-sectional view of the dismantling tool of the utility model before dismantling the upper sealing cover;

[0018] Figure 6 It is an axial cross-sectional view of the dismantling tool of the utility model after the upper sealing cover is dismantled. DETAILED DESCRIPTION

[0019] The utility model will be further described below in conjunction with the accompanying drawings.

[0020] See also Figure 1 The rail transit axle box bearing is a single outer ring, single inner ring, double row cylindrical roller bearing, which includes an outer ring 11 with upper and lower raceways on the inner diameter surface, an inner ring 12 with no raceway on the outer diameter surface and a rib on the upper end, a flat retaining ring 13 arranged at the lower end of the inner ring 12, a row of upper rollers 15a arranged in the upper raceway of the outer ring 11 through an upper retaining frame 14a, a row of lower rollers 15b arranged in the lower raceway of the outer ring 11 through a lower retaining frame 14b, an intermediate ring 16 arranged between the inner side of the lower end surface of the upper roller 15a and the inner side of the upper end surface of the lower roller 15b, an upper sealing cover 17a installed between the inner diameter surface of the outer ring 11 and the outer diameter surface of the inner ring 12 and located above the upper retaining frame 15a, and a lower sealing cover 17b installed between the inner diameter surface of the outer ring 11 and the outer diameter surface of the inner ring 12 and located below the lower retaining frame 15b. The number of an upper roller 15a in a row is the same as the number of a lower roller 15b in a row; the structure and size of the upper retainer 14a are the same as those of the lower retainer 14b in a one-to-one correspondence, and the structure and size of the upper sealing cover 17a are the same as those of the lower sealing cover 17b in a one-to-one correspondence; the interference between the outer diameter surface of the upper sealing cover 17a and the inner diameter surface of the outer ring 11 is large, and a groove 110 is respectively provided at both ends of the inner diameter surface of the outer ring 11, and a limiting flange 170 adapted to the groove 110 on the outer ring 11 is provided at the lower part of the outer diameter surface of the upper sealing cover 17a, so that after the upper sealing cover 17a and the lower sealing cover 17b are installed in place, they are respectively clamped in the two grooves 110 of the outer ring 11 through the limiting flange 170 in a one-to-one correspondence.

[0021] See also Figures 2 to 3b In conjunction with Figure 1 The utility model of the rail transit axle box bearing seal cover removal tooling includes a pressing block 2 and a bottom mold 3; wherein,

[0022] The pressing block 2 is a cylinder with a diameter smaller than the outer diameter of the inner ring 12. The height of the pressing block 2 is greater than or equal to the distance between the upper end surface of the middle spacer 16 and the upper end surface of the outer ring 11 + the height h of the upper sealing cover 17a. The lower circumference of the outer circumference of the pressing block 12 is evenly distributed with a plurality of ridges 20, and the cross section of each ridge 20 is semicircular. The number of ridges 20 is the same as the number of a row of upper rollers 15a. The diameter D of the circle formed by the connecting line of the outer ends of the plurality of ridges 20 is smaller than the inner diameter of the upper retainer 14a and greater than or equal to the outer diameter of the middle spacer 16. The top surface of the pressing block 2 is connected to a press 4. The pressing block 2 is made of aluminum or a material with a smooth surface and relatively low hardness.

[0023] The bottom mold 3 is a circular ring, and the inner hole of the bottom mold 3 is a stepped hole that is larger at the top and smaller at the bottom. The upper inner diameter of the bottom mold 3 is adapted to the outer diameter of the outer ring 11, the lower inner diameter of the bottom mold 3 is larger than the inner diameter of the outer ring 11, and the lower height H of the bottom mold 3 is larger than the height h of the upper sealing cover 17a.

[0024] Please see again Figures 4 to 6 When disassembling the rail transit axle box bearing, first remove the flat retaining ring 13 and the inner ring 12 of the bearing, then insert the bearing into the inner hole of the bottom die 3, so that the lower end surface of the outer ring 11 is placed on the step surface of the inner hole of the bottom die 3, and then insert the pressing block 2 into the bearing from the top of the bearing, so that each ridge 20 on the pressing block 2 is located between two adjacent rollers of the upper row of rollers 15a one by one, until the bottom surface of the pressing block 2 contacts the upper end surface of the middle spacer ring 16; apply pressure through the press machine 4 to make the pressing block 2 Block 2 transfers the force to the middle spacer 16, the lower rollers 15b and the lower retainer 14b in turn, and then the lower sealing cover 17b is pushed downward out of the outer ring 11 by the lower retainer 14b, and then the lower sealing cover 17b, the lower rollers 15b and the lower retainer 14b can be removed; then the bearing is turned 180°, and the upper end face of the outer ring 12 is placed on the step surface of the inner hole of the bottom mold 2, and the upper sealing cover 17a, the upper rollers 15a and the upper retainer 14a are removed using the above method.

[0025] Since the lower height H of the bottom mold 3 is greater than the height h of the upper sealing cover 17a, sufficient space is guaranteed to remove the upper sealing cover 17a and the lower sealing cover 17b, and the end surface of the outer ring also plays a limiting role.

[0026] The utility model provides a removal tool for the rail transit axle box bearing sealing cover, which can ensure that the removed sealing cover is not deformed, so that the sealing cover can be reused, and at the same time ensure that the remaining bearing components are not bumped or scratched during the removal process, which is convenient for subsequent maintenance operations.

[0027] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Technicians in the relevant technical field can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention and should be defined by the claims.

Claims

1. A disassembly tool for a rail transit axle box bearing seal cover, the rail transit axle box bearing is a single outer ring single inner ring double row cylindrical roller bearing, the bearing comprises an outer ring with upper and lower raceways on the inner diameter surface, an inner ring with no raceway on the outer diameter surface and a retaining edge on the upper end, a flat retaining ring arranged at the lower end of the inner ring, an upper row of rollers arranged in the upper raceway of the outer ring through an upper retaining frame, a lower row of rollers arranged in the lower raceway of the outer ring through a lower retaining frame, a middle spacer arranged between the inner side of the lower end surface of the upper row of rollers and the inner side of the upper end surface of the lower rollers, and an installation An upper sealing cover is located between the inner diameter surface of the outer ring and the outer diameter surface of the inner ring and above the upper retainer, and a lower sealing cover is installed between the inner diameter surface of the outer ring and the outer diameter surface of the inner ring and below the lower retainer; the number of upper rollers in a row is the same as the number of lower rollers in a row; the structure and size of the upper retainer are the same as those of the lower retainer in a one-to-one correspondence; the structure and size of the upper sealing cover are the same as those of the lower sealing cover in a one-to-one correspondence; the unloading tooling includes a pressing block and a bottom mold, characterized in that, The pressing block is a cylinder with a diameter smaller than the outer diameter of the inner ring, and the height of the pressing block is greater than or equal to the distance between the upper end surface of the middle spacer ring and the upper end surface of the outer ring + the height h of the upper sealing cover; a plurality of ridges are evenly distributed on the lower circumference of the outer circumference of the pressing block, and the number of the ridges is the same as the number of upper rollers in a row, and the diameter of the circle formed by the connecting line of the outer ends of the plurality of ridges is smaller than the inner diameter of the cage and greater than or equal to the outer diameter of the middle spacer ring; a press is connected to the top surface of the pressing block; The bottom mold is a circular ring, the inner hole of the bottom mold is a stepped hole with a larger upper part and a smaller lower part, the upper inner diameter of the bottom mold is adapted to the outer diameter of the outer ring, the lower inner diameter of the bottom mold is larger than the inner diameter of the outer ring, and the lower height H of the bottom mold is larger than the height h of the upper sealing cover; After the flat retaining ring and inner ring of the bearing are removed, the bottom surface of the outer ring of the bearing is placed on the inner hole step surface of the bottom mold, and the pressure block is inserted into the bearing from the top of the bearing, so that each ridge on the pressure block is located one by one between two adjacent rollers of the upper row of rollers, until the bottom surface of the pressure block contacts the upper end surface of the middle spacer ring; pressure is applied by a press machine, so that the pressure block transfers force to the middle spacer ring, the lower rollers and the lower retaining frame in turn, and the lower sealing cover is pushed downward by the lower retaining frame.

2. The removal tool for the rail transit axle box bearing sealing cover according to claim 1 is characterized in that: The cross section of the ridge on the pressing block is semicircular.

3. The removal tool for the rail transit axle box bearing seal cover according to claim 1 is characterized in that: The pressing block is made of aluminum.

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