A drawing tool assembly for a punch flywheel bearing inner ring
By designing a puller assembly that combines a ring-shaped ferrule and a jack, the problem of disassembling the inner ring of the punch press flywheel bearing was solved, enabling a stable and easy disassembly process and reducing maintenance difficulty and cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YIWU EASY OPEN END INDAL CORP
- Filing Date
- 2025-06-18
- Publication Date
- 2026-06-23
AI Technical Summary
Existing technologies often make it difficult to remove the inner ring of flywheel bearings in punch presses, especially those in large-tonnage gantry forming punch presses, due to jamming or corrosion. Furthermore, traditional three-jaw pullers have problems such as uneven force, ineffective removal of the inner ring, and the need for multiple sets of tools.
A puller assembly comprising a ring sleeve, a pull rod, a jack, a pull plate, and a fixing component was designed. The ring sleeve stabilizes the inner ring of the bearing, and the jacking force is used to achieve uniform force disassembly of the inner ring of the bearing. Combined with a detachable semi-circular sleeve and threaded connection, the stability and flexibility of the disassembly process are ensured.
It enables stable and uniform disassembly of the bearing inner ring, avoids the risk of chipping, adapts to disassembly requirements at different depths, reduces maintenance costs and technical requirements, and is suitable for simple on-site operation.
Smart Images
Figure CN224390430U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of punch press repair tools, specifically relating to a pulling tool assembly for the inner ring of a punch press flywheel bearing. Background Technology
[0002] Traditional punch presses (presses) all have a flywheel, which serves two main functions: storing energy and balancing motion. The working principle of a punch press is to convert circular motion into linear motion. Specifically, the main motor drives the flywheel, which in turn drives gears, a crankshaft (or eccentric gear), and connecting rods via a clutch, thus achieving the linear motion of the slide block. The connection between the flywheel and the crankshaft is achieved through bearings. The bearings between the punch press flywheel and crankshaft are typically sliding bearings and rolling bearings. Sliding bearings offer advantages such as high load-bearing capacity and smooth operation, but require regular maintenance and lubrication. Rolling bearings offer advantages such as easy installation and simple maintenance, but have a relatively lower load-bearing capacity.
[0003] To ensure the normal operation of the punch press, bearings require regular maintenance, and if the rolling bearings at the flywheel are worn, they need to be replaced promptly. Bearing replacement is usually carried out on the production site or in a nearby maintenance workshop, where the work environment is relatively simple and there are not many maintenance tools. However, due to many unpredictable factors, disassembly difficulties are often encountered during the maintenance process. For example, in large-tonnage gantry forming punch presses, the inner rings of the bearings are often jammed or corroded on the crankshaft, making them difficult to remove.
[0004] Currently, the conventional method for removing the inner ring of a flywheel bearing when replacing a large gantry press flywheel bearing is to use a three-jaw puller. A three-jaw puller is a tool used to axially remove a damaged bearing from the shaft; there are mechanical and hydraulic types. A mechanical three-jaw puller mainly consists of a handle, a screw rod, and pull claws. It comes in two-jaw and three-jaw versions, with key dimensions including pull claw length, pull claw spacing, and screw rod length to accommodate bearings of different diameters and axial installation depths. In use, the screw rod tip is positioned in the shaft end center hole, and the pull claw position is adjusted so that the pull claws hook onto the outer ring of the bearing. Rotating the handle causes the pull claws to move the bearing axially outward for removal. A hydraulic three-jaw puller works by utilizing the linear motion of a hydraulic starter rod, combined with the threaded adjustment of the hook claw seat, and by swinging the handle, the object is pulled out.
[0005] Ordinary bearing inner rings can be pulled out using a three-jaw puller. However, a three-jaw puller relies on three points of force applied by its three jaws. If the bearing is jammed with the crankshaft or corroded, it often pulls the inner and outer rings apart, causing the balls or rollers to scatter. The outer ring can be removed, but the inner ring remains firmly clamped to the crankshaft and cannot be removed. Once only the bearing inner ring remains, the three jaws can easily slip out of their own gripping points, making it difficult to hold the bearing inner ring securely. Even if they do manage to hold it, uneven force can easily cause the bearing inner ring to chip, endangering safety. Sometimes, the bearing is installed deep in the crankshaft, and the three-jaw puller is not long enough to reach the bearing inner ring. Furthermore, three-jaw pullers have limited tonnage, are not interchangeable, require multiple sets, and have high maintenance costs. Utility Model Content
[0006] The purpose of this utility model is to provide a pull-out tool assembly for the inner ring of a punch press flywheel bearing, solving the problem that the inner ring of the bearing is difficult to remove during the disassembly process of the punch press flywheel bearing in the prior art.
[0007] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:
[0008] A pulling tool assembly for the inner ring of a punch press flywheel bearing includes an annular sleeve, a pulling rod, a jack, a pull plate, and a fixing member. The annular sleeve is annularly fitted onto the inner ring of the bearing, and the annular sleeve has a fixing hole that matches the pulling rod. The pulling rod can be axially fixed in the fixing hole. The pull plate has a through hole through which the pulling rod can pass. The fixing member can be fixedly mounted on the pulling rod, and at least one width dimension of the fixing member is greater than the minimum width of the through hole.
[0009] Furthermore, the fixing hole is a first threaded hole, the through hole is a second threaded hole, and the pulling rod is a pulling screw, which can be threaded into the first and second threaded holes; the fixing component is a fixing nut, which can be threaded onto the pulling screw. In this technical solution, both the fixing hole and the through hole are threaded holes, and the pulling rod is a screw, which allows for quick fixing of the pulling rod to the annular sleeve during installation; the fixing component is a nut, which also allows for quick fixing and disassembly of the pull plate.
[0010] Furthermore, the annular retaining sleeve includes a matching first semicircular retaining sleeve and a second semicircular retaining sleeve, which are detachably connected. In this technical solution, the two halves of the first and second semicircular retaining sleeves can stably hold the bearing inner ring inside, and the detachable connection between the first and second semicircular retaining sleeves facilitates installation and disassembly.
[0011] Furthermore, the first semicircular ferrule and the second semicircular ferrule are bolted together. The bolted connection between the first and second semicircular ferrules facilitates disassembly and installation.
[0012] Furthermore, the first and second semicircular sleeves are each provided with two of the first threaded holes; the number of second threaded holes is four, and each of the four second threaded holes matches one of the first threaded holes. This configuration ensures that the first and second semicircular sleeves experience uniform force when pulling the bearing inner ring, preventing misalignment and making it easier to pull the bearing inner ring.
[0013] Furthermore, it also includes a centering screw and a centering nut, the centering nut being threadedly connected to the centering screw. The jack is a hollow hydraulic jack, and the centering plate has a centering hole in the middle for the centering screw to pass through. The outer diameter of the centering nut is larger than the inner diameter of the centering hole. This design ensures that the jack is limited by the centering thread when ejecting the inner ring of the bearing, preventing the hollow hydraulic jack from shifting.
[0014] The utility model adopting the above technical solution has the following advantages:
[0015] In this invention, when the bearing inner ring needs to be disassembled, a ring-shaped ferrule is fitted onto the bearing inner ring. A pull rod is then fixedly installed in the fixing hole of the ring-shaped ferrule. The pull plate is then fitted onto the pull rod through the through hole. The two ends of a jack are respectively pressed against the crankshaft end and one side of the pull plate. Finally, a fixing piece is used to secure the pull rod, so that the fixing piece abuts against the other side of the pull plate. When pulling the bearing inner ring, the jack is activated, and the jack pulls outward, moving the bearing inner ring outward for disassembly. Throughout the pulling process, the ring-shaped ferrule fits 360° onto the bearing inner ring, ensuring even force distribution and eliminating the risk of chipping. Furthermore, it can rotate freely 360° to find a suitable pulling position, unrestricted by site location. If the jack tonnage is insufficient, it can be replaced. The pulling depth can be adjusted on-site using the pull rod. The entire installation process is simple and easy, requiring minimal technical expertise, and is suitable for workshop use. Attached Figure Description
[0016] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings;
[0017] Figure 1 This is a schematic diagram of a drawing tool assembly for the inner ring of a punch press flywheel bearing, as described in this utility model, mounted on the machine tool body.
[0018] Figure 2 This is a schematic diagram of the structure of a drawing tool assembly for the inner ring of a punch press flywheel bearing according to the present invention;
[0019] Figure 3 for Figure 2 A schematic diagram of the structure of the first and second semicircular ferrules;
[0020] Figure 4 for Figure 2 A schematic diagram of the structure of the middle tension plate.
[0021] The symbols for the main components are explained below:
[0022] 1. First semicircular ferrule 2. Second semicircular ferrule 3. Pulling rod 3. Jack 4. Pulling plate 5. Fixing nut 6. Centering screw 7. Centering nut 8. First threaded hole 9. Second threaded hole 10. Centering hole 11. Crankshaft 12. Bearing inner ring 13. Punch press body 14. Detailed Implementation
[0023] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that similar or identical parts are referred to by the same reference numerals in the drawings or description. Implementations not shown or described in the drawings are forms known to those skilled in the art. Furthermore, directional terms mentioned in the embodiments, such as "up," "down," "top," "bottom," "left," "right," "front," and "back," are only for reference to the directions in the drawings and are not intended to limit the scope of protection of the present invention.
[0024] This embodiment provides a drawing tool assembly for the inner ring of a punch press flywheel bearing, such as... Figure 1-4 The assembly includes an annular ferrule, a pull rod 3, a jack 4, a pull plate 5, a fixing nut 6, a centering screw 7, and a centering nut 8. The annular ferrule comprises a matching first semicircular ferrule 1 and a second semicircular ferrule 2, which are detachably connected. For ease of disassembly and installation, the first semicircular ferrule 1 and the second semicircular ferrule 2 are bolted together. The annular ferrule can be annularly fitted onto the inner ring 13 of the bearing. The first semicircular ferrule 1 and the second semicircular ferrule 2 are provided with fixing holes that match the pull rod 3, and the pull rod 3 can be axially fixed in the fixing holes. The pull plate 5 is provided with a through hole through which the pull rod 3 can pass. The fixing nut 6 can be fixedly installed on the pull rod 3, and at least one width dimension of the fixing nut 6 is greater than the minimum width of the through hole. The centering nut 8 can be threaded onto the centering screw 7, and the jack 4 is a hollow hydraulic jack; the center of the pull plate 5 is provided with a centering hole 11 through which the centering screw 7 can pass, and the outer diameter of the centering nut 8 is larger than the inner diameter of the centering hole 11.
[0025] In this embodiment, the fixing hole is a first threaded hole 9, the through hole is a second threaded hole 10, the pull rod 3 is a pull screw, and the pull screw can be threaded into the first threaded hole 9 and the second threaded hole 10; the fixing nut 6 can be threaded onto the pull screw. In this embodiment, both the fixing hole and the through hole are threaded holes, and the pull rod 3 is a screw, which allows for quick fixing of the pull rod 3 to the annular sleeve during installation; the fixing nut is a nut, which also allows for quick fixing and disassembly of the pull plate 5.
[0026] Specifically, the first semicircular sleeve 1 and the second semicircular sleeve 2 are each provided with two of the first threaded holes 9; the number of the second threaded holes 10 is four, and the four second threaded holes 10 are respectively matched with the first threaded holes 9. This arrangement in this embodiment ensures that the force on the first semicircular sleeve 1 and the second semicircular sleeve 2 is even when pulling the bearing inner ring 13, avoiding displacement and making it easier to pull the bearing inner ring 13.
[0027] like Figure 1-2 As shown, a crankshaft 12 is provided on the machine tool body, and a bearing inner ring 13 is provided on the crankshaft 12. When using the pull tool assembly of this embodiment to disassemble the bearing inner ring 13, the annular sleeve composed of the first semi-circular sleeve 1 and the second semi-circular sleeve 2 is annularly fitted onto the bearing inner ring 13 and fixed with bolts. Then, the pull rod 3 is threaded into the first threaded hole 9 of the first semi-circular sleeve 1 and the second semi-circular sleeve 2. The second threaded hole 10 on the pull plate 5 is then fitted onto the pull rod 3. The two ends of the jack 4 are respectively pressed against the end of the crankshaft 12 and the left side of the pull plate 5, and fixed with the threaded connection of the fixing bolt to the pull rod 3, so that the fixing bolt abuts against the right side of the pull plate 5. Then, the centering screw 7 is passed through the centering hole 11 and the hollow of the jack 4 and threaded into the hole at the end of the crankshaft 12. Finally, the centering nut 8 is threaded onto the centering screw 7.
[0028] When pulling out the bearing inner ring 13, jack 4 is activated, and jack 4 pulls outward, causing the bearing inner ring 13 to move outward and be removed. Throughout the pulling process, the first semi-circular sleeve 1 and the second semi-circular sleeve 2 are fitted onto the bearing inner ring 13 at 360°, ensuring even force distribution on the bearing inner ring 13 and eliminating the risk of chipping. Furthermore, they can rotate freely 360° to find a suitable pulling position, unrestricted by the site location. If the tonnage of jack 4 is insufficient, it can be replaced. The pulling depth can be achieved at any time on-site using the pulling rod 3. The entire installation process is simple and easy, requiring minimal technical expertise, and is suitable for workshop use.
[0029] The above provides a detailed description of a drawing tool assembly for the inner ring of a punch press flywheel bearing provided by this utility model. The specific embodiments are described only to aid in understanding the method and core concept of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.
Claims
1. A drawing tool assembly for the inner ring of a punch press flywheel bearing, characterized in that: The device includes an annular ferrule, a pull rod, a jack, a pull plate, and a fixing component. The annular ferrule can be annularly fitted onto the inner ring of the bearing. The annular ferrule has a fixing hole that matches the pull rod, and the pull rod can be axially fixed in the fixing hole. The pull plate has a through hole through which the pull rod can pass. The fixing component can be fixedly installed on the pull rod, and at least one width dimension of the fixing component is greater than the minimum width of the through hole.
2. The drawing tool assembly for the inner ring of a punch press flywheel bearing according to claim 1, characterized in that: The fixed mounting hole is a first threaded hole, the through hole is a second threaded hole, the pull rod is a pull screw, and the pull screw can be threaded into the first threaded hole and the second threaded hole; the fixing component is a fixing nut, and the fixing nut can be threaded onto the pull screw.
3. The drawing tool assembly for the inner ring of a punch press flywheel bearing according to claim 2, characterized in that: The annular sleeve includes a matching first semicircular sleeve and a second semicircular sleeve, which are detachably connected.
4. The drawing tool assembly for the inner ring of a punch press flywheel bearing according to claim 3, characterized in that: The first semicircular sleeve and the second semicircular sleeve are bolted together.
5. The drawing tool assembly for the inner ring of a punch press flywheel bearing according to claim 4, characterized in that: The first and second semicircular sleeves are each provided with two of the first threaded holes; the number of the second threaded holes is four, and the four second threaded holes are respectively matched with the first threaded holes.
6. A drawing tool assembly for the inner ring of a punch press flywheel bearing according to any one of claims 1-5, characterized in that: It also includes a centering screw and a centering nut, the centering nut being threaded onto the centering screw, the jack being a hollow hydraulic jack, and the centering hole in the middle of the pull plate allowing the centering screw to pass through, the outer diameter of the centering nut being larger than the inner diameter of the centering hole.