Disassembling device for interference fit bushing

Abstract

The invention discloses a disassembling device for a bushing in interference fit. The device comprises a screw rod, a stress application rod, a mounting disc, a pulling rod, a sunk screw and other core components. The working process is as follows: firstly, the two pulling rods are symmetrically mounted on the mounting disc and are reliably fastened through the sunk screws; after assembly is completed, the device is positioned on the interference assembly lining to be disassembled, and then the screw rod and the stress application rod are installed. During operation, the screw rod is screwed in by rotating the stress application rod, after the end part of the screw rod is in contact with the end surface of the mounting shaft in the bushing, the stress application rod is continuously rotated, and the rotary motion is converted into linear traction force by utilizing the thread propelling principle of the screw rod. And the continuously increased axial force is uniformly transmitted to the end face of the bushing through the mounting disc, so that the bushing is stably separated from the interference fit position in a controllable stress state. The device is reasonable in structural design and clear in force flow transmission path, and has the outstanding advantages of simple structure, low manufacturing and maintenance cost, convenience and reliability in operation and the like.

Description

Technical Field

[0001] This invention relates to a disassembly device for interference fit bushings (bearings), and more specifically, a disassembly device for interference fit parts in general machinery. Background Technology

[0002] In the field of mechanical manufacturing and maintenance, interference fit assembly of bushings and bearings is a widely used technique. However, in on-site production, the disassembly of such interference fit components faces significant challenges when products need adjustment or return for repair. Due to the enormous pressing and bonding forces between the mating surfaces, traditional disassembly methods are not only difficult to apply force but also prone to the following problems: First, the bushing or bearing itself may deform, be scratched, or even be scrapped during forced disassembly; second, the precision structural components that mate with it are often damaged due to uneven force distribution or improper methods. These problems directly affect the adjustability and maintainability of the product, leading to increased production costs, extended maintenance cycles, and reduced production efficiency, becoming a bottleneck restricting production flexibility and economic benefits. This invention is a device for disassembling interference fit bushings designed to address the above practical problems. This device uses an ingenious mechanical structure to smoothly convert rotational torque into uniform axial tension, thereby safely and controllably disassembling the bushing or bearing from the assembly. Its application makes the disassembly process highly convenient and reliable. The device itself can be reused multiple times, and it is simple to install and has low maintenance costs. The implementation of this invention effectively solves the long-standing problem of disassembling interference-fit components during debugging and maintenance in actual production, which is of great significance for ensuring product quality, reducing maintenance costs, and improving production efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a disassembly device for interference-fit bushings or bearings, to solve the problems of low work efficiency, easy damage to valuable parts, and high maintenance costs caused by difficult disassembly in the prior art. This device aims to possess the combined advantages of simple structure, convenient operation, reusability, and low manufacturing cost, thereby significantly improving the maintainability of the equipment and reducing the total life-cycle maintenance cost.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: an interference fit bushing disassembly device, the core of which is a modular pulling system based on the principle of screw transmission. This system mainly includes a screw, a force-applying rod, a mounting plate, a pulling rod, and countersunk screws.

[0005] Furthermore, the mounting plate, serving as the load-bearing foundation and structural core of the entire device, is designed as a disc-shaped structure. This structure facilitates uniform stress distribution. A high-standard internal threaded hole is precisely machined at its geometric center, serving as the main transmission interface for forming a precise helical transmission pair with the screw. In addition, two mounting grooves are precisely symmetrically formed on the surface of the mounting plate relative to the center. These mounting grooves are also machined with internal threads, their axes parallel to the axis of the central threaded hole, ensuring symmetrical force transmission.

[0006] Furthermore, the pull rod is a key component that directly performs the disassembly function. One end of it is machined with an external thread that matches the mounting groove of the mounting plate, allowing for a detachable connection with the mounting plate by screwing it in. To prevent loosening under high tensile force, a countersunk screw is specially designed to axially secure the pull rod from the side of the mounting plate. This anti-loosening design greatly enhances the reliability of the operation. The two pull rods are arranged symmetrically, and their other end is defined as the working end. Depending on the end face structure of the bushing or bearing to be disassembled, it can be designed in various forms such as a hook shape or a flat abutment surface to ensure that it can be firmly and stably engaged in the groove on the outer circle of the workpiece or tightly abut against its end face.

[0007] Furthermore, the screw, serving as a power input and conversion component, has an external thread machined on its shaft that precisely mates with the center hole of the mounting plate. Together, these components form a highly efficient helical transmission pair, converting the rotational torque applied by the operator into a powerful axial linear tensile force.

[0008] Furthermore, the lever, acting as a force-saving mechanism, can be inserted into a radially arranged through hole at the head of the screw to form a lever. By extending the lever arm, the operator can output sufficient torque with a smaller force, thereby easily completing the disassembly operation.

[0009] Furthermore, as a preferred embodiment of the present invention, the pull rod is made of 1Cr17Ni2 high-strength martensitic stainless steel. After appropriate heat treatment, this material not only obtains extremely high strength and sufficient hardness, but also has excellent corrosion resistance and wear resistance, which is sufficient to adapt to the high stress, impact load and severe friction conditions generated during disassembly operations, thereby ensuring that the device has an extremely long service life and continuous operational reliability.

[0010] Compared with the prior art, the present invention has the following significant advantages: (1) Excellent durability and maintainability: The core load-bearing components, such as the pull rod and the screw, are made of high-performance materials, which are highly wear-resistant and conducive to repeated and high-frequency clamping of workpieces, resulting in a long service life. At the same time, the main structural components such as the mounting plate have good machinability. Even if the mating surfaces are worn or damaged after long-term use, their accuracy can be restored through simple secondary processing (such as turning the outer circle and repairing the thread), giving the device the ability to be "reborn". Replacement and maintenance are extremely convenient and economical; (2) Extremely high structural reliability and operational safety: Thanks to the application of high-strength materials such as the pull rod and the screw, as well as the symmetrical design of the mounting plate and the anti-loosening structure of the countersunk screw, the entire device is structurally reliable and stable when subjected to huge tensile forces, without the risk of deformation or breakage. The symmetrical pull rod design ensures that the pulling force acting on the bushing or bearing is always uniform and centered, fundamentally avoiding safety problems such as part jamming, internal hole scratching or device overturning caused by uneven load; (3) Significant comprehensive benefits: The structure design of this invention is scientific and reasonable, the components are simplified, and the manufacturing and maintenance costs are low. This makes the efficiency and success rate of disassembling interference fit parts leap forward. The device is highly versatile and efficient, which can significantly shorten the maintenance cycle and reduce the loss of scrapped parts caused by disassembly failure. It has a significant positive effect on improving the production process and controlling the overall cost. Attached Figure Description

[0011] Figure 1 This is an exploded view of the overall structure of the present invention.

[0012] Figure 2 This is a top view of the disassembly device of the present invention.

[0013] Reference numerals: 1-Screw; 2-Forcer rod; 3-Mounting plate; 4-Tuning lever; 5-Screw; 6-Interference fit bushing. Detailed Implementation

[0014] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0015] Example: Figures 1-2 The device shown is for disassembling an interference fit bushing, including a mounting plate 3 with symmetrical mounting grooves on both sides. The mounting grooves have internal thread features, and a lever 4 can be installed by threaded connection. The mounting plate 3 is circular in shape and has an internal thread in the center hole, which can be assembled and connected with a screw 1.

[0016] After the lever 4 is assembled onto the mounting plate, the other end can extend and be inserted into the bushing or the outer circle of the bearing. The design of the two levers can make the bushing or bearing displace and be subjected to force evenly.

[0017] The screw 1 is connected to the lever 4. The screw 1 moves towards the bushing or bearing mounting shaft until it makes contact. When the screw is screwed in further by the force-applying lever to generate displacement, it can drive the interference fit bushing or bearing to generate relative displacement, thereby causing the bushing or bearing to move by applying force.

[0018] The mounting plate 3, lever 4, screw 1, and extension lever 2 of the device are connected by countersunk screws and threads, and are easy to disassemble and maintain.

[0019] The wear-resistant lever 4 is made of CrNi steel.

[0020] Secure the lever (4) to the mounting plate (3) with countersunk screws, then screw the screw (1) into the mounting plate (3) and assemble the force-adding rod (2).

[0021] Mount the bushings or bearings on both sides of the pull rod.

[0022] The lever (4) is fastened to the mounting plate (3) by countersunk screws.

[0023] Screw the screw (1) into the mounting plate (3).

[0024] Mounting disc 3, as the core load-bearing component, is designed in a disc-shaped structure. A precisely machined internal threaded hole is located at the center of the disc, serving as the main drive threaded hole for assembly with screw 1 to form a precise helical drive pair. On the surface of mounting disc 3, two mounting grooves are symmetrically machined relative to the center. These mounting grooves are not simple through holes; they also have internal threads machined inside for precise positioning and connection of the two pull rods 4. This symmetrical design is crucial to ensuring uniform force distribution.

[0025] The pull rod 4 is the component that directly applies force to the workpiece to be disassembled. Its end near the mounting plate 3 is machined with external threads, which precisely engage with the internal threads in the mounting groove of the mounting plate 3, thus achieving a detachable connection. To ensure that the pull rod 4 does not loosen or rotate during high-intensity pulling, after tightening, a countersunk screw 5 is used for axial fastening from the side of the mounting plate 3. The countersunk design ensures the flatness of the mounting surface. The other end of the pull rod 4 is the working end, whose structure can be designed according to the end face shape of the bushing or bearing. For example, a hook-shaped or flat bayonet can be machined to reliably engage with the groove on the outer circle of the workpiece or abut against its end face. Preferably, the pull rod 4 is made of a high-strength, high-hardness material such as 1Cr17Ni2 steel, and its wear resistance is improved through heat treatment to withstand the high stress and friction during repeated disassembly operations.

[0026] Screw 1 is the power input and conversion component of the device. Its shaft is machined with external threads that match the center hole of the mounting plate 3. Through the engagement with the center internal thread hole, it converts rotary motion into linear motion. The head of screw 1 is usually designed with a radial through hole for inserting the force-adjusting rod 2.

[0027] The lever 2 is inserted into the radial hole at the head of the screw 1 to increase the lever arm, allowing the operator to easily apply sufficient rotational torque.

[0028] The specific working process of the device is as follows: First, assemble the device: Screw the two pull rods 4 into the symmetrical threaded mounting slots on the mounting plate 3, and lock them in place with countersunk screws 5 to form a stable tension frame.

[0029] Screw the screw 1 into the central threaded hole of the mounting plate 3 from the side without the pull rod, and pre-screw in a few turns.

[0030] Insert the extension rod 2 into the radial hole at the head of the screw 1 for use.

[0031] Next, proceed with the disassembly process: Move the assembled device to the front of the bushing or bearing to be disassembled. Ensure the working ends of the two pull rods 4 are accurately engaged in the appropriate positions on the end faces of the bushing or bearing (such as in the process groove or directly against the end face).

[0032] Keep the device stable and rotate the force-applying rod 2 clockwise. The force-applying rod 2 drives the screw 1 to rotate. Since the end of the screw 1 is now pointing towards and about to contact the end face of the mounting shaft inside the bushing, the screw 1 will gradually move towards the mounting shaft during rotation until its end is in close contact with the end face of the mounting shaft.

[0033] At this point, continue to rotate the force-applying rod 2. Since the axial movement of the screw 1 is blocked by the mounting shaft, according to the principle of screw transmission, its reaction force will be converted into a huge axial tensile force. This tensile force is transmitted to the mounting plate 3 through the threaded joint between the screw 1 and the mounting plate 3, and then evenly applied to the bushing or bearing to be disassembled by the mounting plate 3 through two symmetrical pull rods 4.

[0034] By continuously and steadily applying torque, this uniform axial tensile force will overcome the frictional force generated by the interference fit, and finally pull the bushing or bearing out of the seat hole it mates with smoothly and completely, completing the disassembly operation.

[0035] Through the aforementioned modular and symmetrical mechanical structure, this invention achieves controllability and safety in the disassembly process, effectively protects valuable parts, and significantly improves maintenance efficiency.

Claims

1. A device for disassembling interference fit bushings, comprising a screw (1), a force-applying rod (2), a mounting plate (3), and a pull rod (4), characterized in that: The mounting plate (3) is a disc-shaped structure with an internal threaded hole in the center for connection with the screw (1); the mounting plate (3) has at least two symmetrically distributed mounting slots, each of which has an internal thread; one end of the pull rod (4) has an external thread that matches the internal thread of the mounting slot, and is detachably mounted in the mounting slot through the thread pair.

2. The device for disassembling interference-fit bushings according to claim 1, characterized in that: There are two pull rods (4), which are symmetrically installed on the mounting plate (3). When the device is assembled, the end of the pull rod (4) away from the mounting plate (3) can extend and be inserted into the outer groove or end face of the bushing or bearing to be disassembled, so that the bushing or bearing is subjected to uniform axial tension during disassembly and avoids uneven load.

3. The device for disassembling interference fit bushings according to claim 1, characterized in that: The screw (1) and the internal threaded hole at the center of the mounting plate (3) form a helical transmission pair. During operation, the assembled mounting plate (3) and the pull rod (4) are placed at the front end of the bushing or bearing, so that the locking end of the pull rod (4) is in place. Then the screw (1) is screwed into the mounting plate (3) until its end contacts the end face of the mounting shaft inside the bushing or bearing. The screw (1) is rotated by the force bar (2). Using the helical transmission principle, the rotational motion is converted into the linear motion of the assembly of the mounting plate (3) and the pull rod (4), thereby smoothly applying axial force and pressing the interference-fit bushing or bearing out of the mounting seat.

4. The device for disassembling interference fit bushings according to claim 1, characterized in that: The mounting plate (3) and the lever (4) of the device are connected by threads and are axially fastened by countersunk screws (5) to prevent loosening; the force rod (2) can be inserted into the radial hole of the head of the screw (1) to form a lever mechanism; the whole device is modularly connected by threads and countersunk screws, and has the characteristics of easy disassembly, maintenance and replacement.

5. The device for disassembling interference fit bushings according to claim 1, characterized in that: The pull rod (4) is made of 1Cr17Ni2 steel and has high strength, high hardness and excellent wear resistance after heat treatment, so as to adapt to the high stress and friction generated when disassembling interference fit parts.

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