A dismounting tool for an interference fit bearing

Abstract

The utility model relates to mechanical maintenance tool technical field, especially a kind of dismounting tool for interference fit bearing, including operation driving assembly, force transmission assembly and clamping dismounting assembly;Operation driving assembly contains operating lever and power transmission screw rod, operating lever is used to drive power transmission screw rod rotation;Force transmission assembly contains top disc, locating cap, pull rod, power transmission screw rod is connected with top disc thread, locating cap is sleeved in power transmission screw rod end, after positioning, not together with power transmission screw rod circumferential motion;Pull rod upper end is hinged with top disc through connecting pin shaft, lower end is hinged with clamping dismounting assembly by pin shaft;Clamping dismounting assembly contains clamping jaw and auxiliary clamping ring, clamping jaw is hinged with pin shaft, auxiliary clamping ring is sleeved in the outside of clamping jaw, constrain clamping jaw clamping bearing outer ring.The utility model is adapted to narrow space and on-site maintenance operation, hinged structure self-adapting ability is strong, auxiliary clamping ring can effectively prevent skidding, tool stability is strong, good universality, and cost is low, easy maintenance.

Description

Technical Field

[0001] This utility model relates to the field of mechanical repair tools, and in particular to a disassembly tool for interference fit bearings. Background Technology

[0002] Disassembling interference-fit bearings is a common challenge during mechanical equipment maintenance. Existing bearing disassembly tools are mostly traditional mechanical pullers and hydraulic pullers. Mechanical pullers often employ a two- or three-jaw structure, resulting in a small contact area between the jaws and the bearing, which easily leads to stress concentration, causing cracks in the bearing outer ring or scratches on the journal. While hydraulic pullers offer high pulling force, their complex structure and bulky size hinder rapid on-site operations, and they are also costly. The small contact area of ​​the jaws and uneven force distribution easily cause slippage and uneven loading, easily damaging the bearing and shaft, and they have poor adaptability. Although hydraulic pullers offer high pulling force, their bulky structure and high cost make them unsuitable for confined spaces and unpowered on-site operations, resulting in a high failure rate.

[0003] Existing disassembly tools suffer from uneven force distribution, slippage, and damage to bearings or shafts. They also lack versatility, cannot adapt to the disassembly requirements of bearings of different specifications, and cannot achieve efficient and non-destructive bearing disassembly operations. Consequently, they fail to meet the demand for convenient and non-destructive use in mechanical maintenance. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model discloses a disassembly tool for interference fit bearings.

[0005] The specific technical solution is as follows: A disassembly tool for interference fit bearings, used for disassembling and separating interference fit bearings and their mating shafts, includes an operating drive assembly, a force transmission assembly, and a clamping disassembly assembly. The operating drive assembly includes an operating lever and a force transmission screw. The operating lever is connected to a hole at the top of the force transmission screw for driving the screw to rotate. The force transmission assembly includes a top plate, a positioning cover, a pull rod, a connecting pin, and a pin. The force transmission screw is threadedly connected to the top plate. The positioning cover is fitted onto the end of the force transmission screw and, after positioning, does not move circumferentially with the force transmission screw. The upper end of the pull rod is hinged to the top plate via the connecting pin, and the lower end is hinged to the clamping disassembly assembly via the pin. The clamping disassembly assembly includes a gripper and an auxiliary clamping ring. The gripper is hinged to the pin, and the auxiliary clamping ring is fitted onto the outside of the gripper to constrain the gripper to clamp the outer ring of the bearing.

[0006] The operating rod passes horizontally through the hole at the top of the force transmission screw. By adjusting the insertion depth of the operating rod in the hole, the lever principle is used to effortlessly drive the force transmission screw to rotate horizontally in a circumferential direction.

[0007] The force transmission screw is made of 12.9 grade high-strength standard parts; the tie rod and the gripper are evenly arranged circumferentially and are all made of 45 steel with heat treatment; the connecting pin and the pin shaft are all made of 40Cr material; the auxiliary clamping ring is a ring-shaped part made of 65Mn spring steel.

[0008] Compared with the prior art, the present invention has the following beneficial technical effects: This utility model addresses the technical shortcomings of existing interference fit bearing disassembly tools, such as uneven force distribution, easy slippage and workpiece damage, inconvenient operation, and limited application scenarios. It provides a disassembly tool for interference fit bearings, which achieves smooth and non-destructive disassembly of bearings by optimizing the overall structural design. At the same time, it improves the applicability and ease of operation of the tool. It is especially suitable for on-site disassembly and maintenance of interference fit bearings in various small and medium-sized mechanical equipment and transmission components, and belongs to the field of mechanical maintenance tools.

[0009] The gripper fits tightly against the bearing outer ring, distributing force evenly and preventing stress concentration. This effectively prevents damage to bearings and shafts, enabling non-destructive disassembly. The entire unit is a purely mechanical structure, simple and compact, easy to operate, requiring no external power, and suitable for confined spaces and on-site maintenance. The articulated structure offers strong self-adaptability, and the auxiliary clamping ring effectively prevents slippage. The tool boasts high stability, good versatility, low cost, and easy maintenance. Attached Figure Description

[0010] Figure 1 This is a three-dimensional structural diagram of the disassembly tool of this utility model; Figure 2 This is a schematic diagram of the planar structure of the disassembly tool of this utility model; Figure 3 for Figure 2 Sectional view of section AA; In the diagram, 1 is the operating lever; 2 is the lead screw; 3 is the top plate; 4 is the positioning cover; 5 is the pull rod; 6 is the connecting pin; 7 is the pin; 8 is the gripper; 9 is the auxiliary clamping ring; 10 is the bearing; and 11 is the matching shaft. Detailed Implementation

[0011] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the accompanying drawings.

[0012] Figure 1 This is a three-dimensional structural diagram of the disassembly tool of this utility model. Figure 2 This is a schematic diagram of the planar structure of the disassembly tool of this utility model. Figure 3 for Figure 2 The sectional view of section AA is shown in the figure: This utility model relates to a disassembly tool for interference fit bearings, used for disassembling and separating the interference fit bearing 10 and its matching shaft 11. It includes an operation drive assembly, a force transmission assembly, and a clamping disassembly assembly. The operation drive assembly includes an operating lever 1 and a force transmission screw 2. The operating lever 1 is connected to a hole at the top of the force transmission screw 2 and is used to drive the force transmission screw 2 to rotate. The force transmission assembly includes a top plate 3, a positioning cover 4, a pull rod 5, a connecting pin 6, and a pin 7. The force transmission screw 2 is threadedly connected to the top plate 3. The positioning cover 4 is fitted onto the end of the force transmission screw 2 and, after positioning, does not move circumferentially with the force transmission screw 2. The upper end of the pull rod 5 is hinged to the top plate 3 via the connecting pin 6, and the lower end is hinged to the clamping disassembly assembly via the pin 7. The clamping disassembly assembly includes a gripper 8 and an auxiliary clamping ring 9. The gripper 8 is hinged to the pin 7, and the auxiliary clamping ring 9 is fitted onto the outside of the gripper 8, constraining the gripper 8 to clamp the outer ring of the bearing 10.

[0013] The operating rod 1 passes horizontally through the hole at the top of the force transmission screw 2. By adjusting the insertion depth of the operating rod 1 in the hole, the lever principle is used to effortlessly drive the operating rod 1 to rotate the force transmission screw 2 horizontally in a circumferential direction.

[0014] The force transmission screw 2 is made of 12.9 grade high strength standard parts; the tie rod 5 and the gripper 8 are evenly arranged in the circumference and are both made of 45 steel heat treatment material; the connecting pin 6 and the pin 7 are both made of 40Cr material; the auxiliary clamping ring 9 is a ring part made of 65Mn spring steel.

[0015] In use, place the gripper 8 against the outer ring of the bearing 10 to be disassembled, rotate the operating lever 1 to rotate the lead screw 2, drive the top plate 3 to move axially, and drive the gripper 8 to clamp the bearing through the pull rod 5. Continuous force can achieve smooth pull-out and disassembly of the interference fit bearing. The specific steps are as follows: (1) Assembly and positioning: thread the power transmission screw 2 with the top plate 3, put the positioning cover 4 on the bottom of the power transmission screw 2, and install the operating rod 1 in the top hole of the power transmission screw 2; hinge the upper end of the three pull rods 5 to the top plate 3 through the connecting pin 6, and hinge the lower end to the three grippers 8 through the pin 7 respectively; then put the auxiliary clamping ring 9 on the outside of all grippers 8 to complete the overall assembly of the tool; (2) Tooling in place: Put the assembled tool into the interference bearing to be disassembled, so that the inner arc surface of each claw 8 is tightly attached to the outer ring end face of the bearing, adjust the tool position, and ensure that the force transmission screw 2 is coaxially arranged with the bearing to be disassembled and the matching shaft. (3) Clamping force: Manually rotate the operating lever 1 to drive the transmission screw 2 to rotate, drive the top plate 3 to move upward along the screw axis, and pull the claw 8 synchronously through the pull rod 5. Under the constraint of the auxiliary clamping ring 9, the claw 8 further tightens and clamps the outer ring of the bearing. (4) Disassembly operation: Continuously rotate the operating lever 1 at a constant speed to generate axial pulling force through the screw drive, which drives the gripper 8 to pull upward smoothly and slowly pull the interference fit bearing out of the drive shaft to complete the disassembly operation; after disassembly, rotate the operating lever 1 in the opposite direction to release the gripper 8 and remove the auxiliary clamping ring 9, so that the matching shaft 11 and the bearing 10 can be separated.

Claims

1. A disassembly tool for interference fit bearings, used for disassembling and separating an interference fit bearing (10) and a mating shaft (11), characterized in that: It includes an operation drive assembly, a force transmission assembly, and a clamping and disassembly assembly; the operation drive assembly includes an operating lever (1) and a force transmission screw (2), the operating lever (1) is connected to a hole at the top of the force transmission screw (2) for driving the force transmission screw (2) to rotate; the force transmission assembly includes a top plate (3), a positioning cover (4), a pull rod (5), a connecting pin (6), and a pin (7), the force transmission screw (2) is threadedly connected to the top plate (3), and the positioning cover (4) is fitted with... Located at the end of the force transmission screw (2), it does not move in a circular motion with the force transmission screw (2) after positioning; the upper end of the pull rod (5) is hinged to the top plate (3) via the connecting pin (6), and the lower end is hinged to the clamping and disassembly assembly via the pin (7); the clamping and disassembly assembly includes a clamping claw (8) and an auxiliary clamping ring (9), the clamping claw (8) is hinged to the pin (7), and the auxiliary clamping ring (9) is sleeved on the outside of the clamping claw (8) to constrain the clamping claw (8) to clamp the outer ring of the bearing (10).

2. The disassembly tool for interference fit bearings according to claim 1, characterized in that: The operating rod (1) passes horizontally through the hole at the top of the force transmission screw (2). By adjusting the insertion depth of the operating rod (1) in the hole, the lever principle is used to effortlessly drive the operating rod (1) to rotate horizontally and circumferentially.

3. The disassembly tool for interference fit bearings according to claim 1, characterized in that: The force transmission screw (2) is made of 12.9 grade high strength standard parts; the tie rod (5) and the gripper (8) are evenly arranged in the circumference and are all made of 45 steel heat treatment material; the connecting pin (6) and the pin (7) are both made of 40Cr material; the auxiliary clamping ring (9) is a ring part made of 65Mn spring steel.

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