Lossless bearing disassembling device capable of controlling impact load

Abstract

The invention discloses a bearing lossless disassembling device capable of controlling an impact load. The bearing lossless disassembling device comprises a main supporting rod, an extension rod, a force transmission column, a movable hammer and a cylindrical compression spring. The main supporting rod is in horizontal threaded connection with the extension rod, and the force transmission column is vertically arranged on the main supporting rod in a threaded mode. The force transmission column is sleeved with the cylindrical compression spring, one end of the cylindrical compression spring sleeve is connected with the main supporting rod, the other end of the cylindrical compression spring sleeve is connected with the movable hammer, and the movable hammer is movably arranged on the force transmission column. Through holes for placing the pressing balls are formed in the main supporting rod and the extension rod; and a plurality of pressing balls are arranged in the through holes in the main supporting rod and the extension rod. Controllable axial impact force directly acts on the inner ring of the bearing, so that the integrity of a bearing raceway and a retainer is effectively protected for the bearing, and the valuable bearing can be repeatedly used after being overhauled.

Description

Technical Field

[0001] This invention belongs to the field of bearing technology, and in particular relates to a non-destructive disassembly device for bearings under controllable impact load. Background Technology

[0002] Bearing disassembly is a common phenomenon in the field of mechanical assembly. Whether it's disassembling the entire bearing or a single outer ring, it's extremely common, especially in the early stages of design verification for functional validation during trial assembly. In high-value-added mechanisms, non-destructive disassembly is a necessity. This design, based on the need for non-destructive disassembly, cleverly devises a simple yet effective disassembly solution. Through the assembly of just a few simple parts, it achieves disassembly under controlled impact loads, facilitating operation, especially in relatively confined spaces, enabling easy bearing disassembly, and possessing strong versatility. Summary of the Invention

[0003] In view of this, the present invention aims to provide a controllable impact load bearing non-destructive disassembly device to solve at least one technical problem in the background art.

[0004] The purpose of this invention is to solve the problem of non-destructive disassembly of bearings in mechanical assembly. It can also be used for disassembling a single bearing outer ring, or other types of bushings. It is particularly suitable for bearings with separable inner rings, where the outer ring is interference-fitted, allowing disassembly of only the outer ring after separating the inner ring and steel balls. Alternatively, it can be applied to bearings with ball-filling notches, allowing disassembly of only the outer ring after separating the inner ring and steel balls.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows: A controllable impact load bearing non-destructive disassembly device includes a main support rod, an extension rod, a force transmission column, a movable hammer, and a cylindrical compression spring; The main support rod and the extension rod are connected by a horizontal thread, and the force transmission column is set with a vertical thread on the main support rod. A cylindrical compression spring is sleeved on the force transmission column. One end of the cylindrical compression spring sleeve is connected to the main support rod, and the other end is connected to the movable hammer. The movable hammer is movably mounted on the force transmission column. Both the main support rod and the extension rod have through holes inside for placing the pressure ball; Several clamping balls are installed in the through holes inside the main support rod and the extension rod.

[0006] Furthermore, the main support rod is provided with mounting holes for installing the force transmission column, and the mounting holes are provided with a first internal thread. The bottom of the force transmission column is provided with a connecting column corresponding to the mounting hole, and the connecting column is provided with a first external thread corresponding to the first internal thread.

[0007] Furthermore, one end of the main support rod is provided with a ring-shaped platform for connection with the extension rod; the ring-shaped platform is provided with a second external thread.

[0008] Furthermore, one end of the extension rod is provided with an annular groove corresponding to the annular platform, and the annular groove is provided with a second internal thread corresponding to the second external thread.

[0009] Furthermore, the surface of the force transmission column is equipped with a spring compression scale.

[0010] Furthermore, a nut is provided at the end of the force transmission column away from the main support rod.

[0011] Furthermore, the main support rod and extension rod are made of stainless steel with a hardness of 38-42 HRC.

[0012] Furthermore, the force transmission column and the movable hammer are made of high-temperature alloy with a tensile strength σb≥1100MPa, and the contact surfaces of the force transmission column and the movable hammer are coated with a molybdenum disulfide lubricating layer.

[0013] Furthermore, the cylindrical compression spring is made of spring steel and its surface is coated with a molybdenum disulfide layer.

[0014] Furthermore, the clamping ball is a bearing steel ball with a hardness of 61-65 HRC after heat treatment.

[0015] Compared with existing technologies, the controllable impact load bearing non-destructive disassembly device of the present invention has the following advantages: 1. Compared with traditional methods such as hammering, hydraulic pullers, flame cutting, or grinding, this device applies a controlled axial impact force directly to the inner ring of the bearing, effectively avoiding the following damage: It protects the bearing raceway and cage integrity, allowing valuable bearings to be reused after maintenance. It also protects the precision of the journal and the integrity of the bearing housing and pedestal, avoiding secondary processing or replacement due to disassembly, thus saving significant costs and time.

[0016] 2. This application avoids the high-temperature thermal stress generated by flame cutting or thermal expansion methods, which can lead to changes in metal structure, shaft deformation, or loss of precision. It eliminates the need for chemical lubricants or loosening agents, making it environmentally friendly.

[0017] 3. This application is equipped with a spring compression scale, which ensures that the energy of each impact is consistent, realizing the leap from "based on experience" to "based on standards", and greatly improving the controllability and success rate of the disassembly process.

[0018] 4. This application utilizes spring energy storage and gravity to convert the operator's downward pressure into a huge upward impact force, generating great power with minimal effort and greatly reducing labor intensity. The impact is direct and energy is concentrated, quickly overcoming static friction. Compared to traditional methods of continuous pulling or repeated striking, the disassembly speed is much faster.

[0019] 5. The threaded connection design between the main support rod and the extension rod in this application allows the tool length to be flexibly adjusted according to the bearing installation depth. By replacing support rods of different diameter series and corresponding size clamping balls, the core principle of one tool can cover bearings of various specifications, which is highly versatile and reduces the number and purchase cost of special tools.

[0020] 6. The clamping ball of this application constitutes a simple and efficient radial self-locking system. It automatically clamps when the force transmission column is tightened, becoming tighter with each pull, ensuring that the impact force can be effectively applied to the bearing and preventing slippage or detachment. Attached Figure Description

[0021] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of a controllable impact load bearing non-destructive disassembly device proposed in this invention; Figure 2 This is a three-dimensional schematic diagram of a controllable impact load bearing non-destructive disassembly device proposed in this invention; Figure 3 This is a side view of the main support rod of a controllable impact load bearing non-destructive disassembly device proposed in this invention; Figure 4 for Figure 3 A schematic diagram of the cross-section of BB; Figure 5 This is a side view of the extension rod of the controllable impact load bearing non-destructive disassembly device proposed in this invention; Figure 6 for Figure 5 A schematic diagram of the cross-section of AA; Figure 7 This is a side view of the force transmission column of a controllable impact load bearing non-destructive disassembly device proposed in this invention; Figure 8 for Figure 7 A schematic diagram of the cross-section of AA; Figure 9 This is a schematic diagram of the force transmission column of a controllable impact load bearing non-destructive disassembly device proposed in this invention; Figure 10 This is a schematic diagram of a cylindrical compression spring in a controllable impact load bearing non-destructive disassembly device proposed in this invention; Figure 11 for Figure 10 A schematic diagram of the cross-section of AA.

[0022] Explanation of reference numerals in the attached figures: 1. Main support rod; 2. Extension rod; 3. Force transmission column; 4. Movable hammer; 5. Cylindrical compression spring; 6. Compression ball; 7. Outer ring to be disassembled; 8. Mounting hole; 9. First internal thread; 10. Connecting column; 11. Second internal thread; 12. Second external thread; 13. Through hole; 14. Spring compression scale. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0024] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] A controllable impact load bearing non-destructive disassembly device includes a main support rod 1, an extension rod 2, a force transmission column 3, a movable hammer 4, and a cylindrical compression spring 5. The main support rod 1 and the extension rod 2 are horizontally threaded together, and the force transmission column 3 is vertically threaded onto the main support rod 1. The cylindrical compression spring 5 is sleeved on the force transmission column 3, with one end connected to the main support rod 1 and the other end connected to the movable hammer 4, which is movably mounted on the force transmission column 3. Both the main support rod 1 and the extension rod 2 have through holes 13 for placing clamping balls 6. Several clamping balls 6 are disposed within the through holes 13 inside the main support rod 1 and the extension rod 2. The main support rod 1 has mounting holes 8 for installing the force transmission column 3, and the mounting holes 8 have a first internal thread 9. The bottom of the force transmission column 3 has a connecting column 10 corresponding to the mounting holes 8, and the connecting column 10 has a first external thread corresponding to the first internal thread 9.

[0028] One end of the main support rod 1 is provided with an annular platform for connection with the extension rod 2; the annular platform is provided with a second external thread 12. One end of the extension rod 2 is provided with an annular groove corresponding to the annular platform, and the annular groove is provided with a second internal thread 11 corresponding to the second external thread 12. The surface of the force transmission column 3 is provided with a spring compression scale 14.

[0029] A nut is provided at the end of the force transmission column 3 furthest from the main support rod 1. The main support rod 1 and the extension rod 2 are made of stainless steel with a hardness of 38-42 HRC. The force transmission column 3 and the movable hammer 4 are made of high-temperature alloy with a tensile strength σb ≥ 1100 MPa, and the contact surfaces of the force transmission column 3 and the movable hammer 4 are coated with a molybdenum disulfide lubricating layer. The cylindrical compression spring 5 is made of spring steel with a molybdenum disulfide coating. The clamping ball 6 is a bearing steel ball with a hardness of 61-65 HRC after heat treatment.

[0030] The main support rod 1, as the primary force transmission component, is connected to the extension rod 2 via external threads and internal threads. The central through hole 13 is used to install the clamping ball 6, making it a crucial component. The main support rod 1 is designed to be made of stainless steel and should undergo heat treatment (hardness 38-42 HRC).

[0031] The extension rod 2 is connected to the main support rod 1 via an internal thread, forming a single unit. Its length can be adjusted to suit different disassembly requirements depending on the bearing being disassembled. The inner diameter is the same as that of the main support rod 1, and the central through hole 13 is used to install the clamping ball 6. The material is designed to be stainless steel and should undergo tempering heat treatment (hardness 38-42 HRC).

[0032] The force transmission column 3 is the core component connecting the support rod and the movable shaft. It connects to the main support shaft via an external thread to transmit force. It has its own spring compression scale 14 for easy detection of spring compression (elastic force). Adjustments are made according to the load requirements of the bearing being disassembled, ensuring the disassembly force is less than the bearing's axial destructive force (e.g., if the bearing's axial impact load is not allowed to exceed 50N, the spring compression is adjusted to make the impact load less than 50N), thus achieving non-destructive disassembly. The surface where the force transmission column 3 connects to the movable hammer 4 is coated with molybdenum disulfide for lubrication during contact. The force transmission column 3 is designed to be made of a high-temperature resistant material, specifically a high-temperature alloy, and undergoes heat treatment (σb≥1100Mp).

[0033] The movable hammer 4 is fitted with the force transmission column 3 through a small clearance between its inner hole and the column, allowing the column 3 to move flexibly up and down. The inner hole of the movable hammer 4 is coated with molybdenum disulfide to achieve solid lubrication. The movable hammer 4 is made of a high-temperature alloy and is designed to withstand high temperatures, and should undergo heat treatment (σb≥1100Mp).

[0034] The inner diameter of the cylindrical compression spring 5 mates with the force transmission column 3 in one direction, and its elastic coefficient is designed with reference to the requirements of disassembled bearings. The spring should have good fatigue strength and be able to achieve a long fatigue life. The entire spring is coated with molybdenum disulfide, and the material is designed to be spring steel, such as 65Mn, and should undergo isothermal quenching heat treatment.

[0035] The clamping ball 6 can be made of bearing steel, and its size is selected according to the inner diameter of the support rod. The number of support rods inserted is arranged reasonably according to the size of the bearing being disassembled. The clamping ball 6 is designed to be made of bearing steel, with a hardness of 61-65 HRC after heat treatment.

[0036] The main support rod 1 is connected to the extension rod 2 via threads to form a single unit. The inner diameters of the main support rod 1 and the extension rod 2 are identical. The main support rod 1 is connected to the force transmission column 3 via a threaded connection. After tightening the force transmission column 3 to its maximum extent according to the actual working conditions, subsequent disassembly operations can be performed. The length of extension rod 2 is adjusted according to the actual type and size of the disassembled bearing. Alternatively, multiple extension rods 2 of different lengths can be made according to actual needs, and the appropriate extension rod 2 can be selected according to the different disassembled bearings. The head of the force transmission column 3 can be designed into a hexagonal shape or other shapes that facilitate tightening, depending on actual needs. The force transmission column 3 and the movable hammer 4 are clearance-fitted, and the contact parts are coated with molybdenum disulfide for solid lubrication. The threads of the tightening parts between the force transmission column 3 and the main support rod 1 are manufactured by rolling to improve the strength of the threads; The movable hammer 4 is designed with an outer diameter based on actual load requirements, and its inner diameter is clearance-fitted with the force transmission column 3. The mating parts are coated with molybdenum disulfide. Its specific shape is not limited to cylindrical; it can also be designed in other shapes as needed. The product's components can be customized to titanium alloy, structural steel, or other metal materials according to the frequency of use; the cylindrical compression spring 5 can also be designed as a conical shape or other shapes as needed; the controllable impact load disassembly device of the present invention can be used not only to disassemble bearings or bearing outer rings, but also to disassemble bushings or other space-limited components with interference fits. Example 2 This device is a specialized tool based on the principles of controllable impact kinetic energy and mechanical expansion, designed to solve the problem of bearing, shaft, or housing damage that is easily caused during traditional bearing disassembly. Its core working principle is that by inserting a clamping ball 6 into the bearing hole, when the device is under tension, the clamping ball 6 will embed itself between the main support rod 1 and the inner wall of the bearing, forming a self-locking effect and firmly anchoring the device in the workpiece.

[0037] By pressing down and releasing the movable hammer 4, its gravitational potential energy and the elastic potential energy stored in the cylindrical compression spring 5 are converted into kinetic energy, generating an upward impact force. This force is transmitted to the main support rod 1 through the force transmission column 3, ultimately forming a brief and intense "upward pull" impact load. This impact load acts on a localized area of ​​the bearing's inner ring through the anchored clamping ball 6, sufficient to overcome the static friction of the interference fit between the bearing and the shaft or housing, causing it to undergo a slight displacement. Through multiple directional impacts, the bearing can be disassembled smoothly and without damage.

[0038] Align the annular groove at one end of the extension rod 2 with the annular platform at one end of the main support rod 1.

[0039] Rotate the extension rod 2 so that its internal second internal thread 11 engages with the second external thread 12 on the annular platform until the two are tightly joined, forming an extended rigid support body. The use of the extension rod 2 can be selected according to the installation depth of the bearing.

[0040] Place the compression balls 6, and sequentially insert a specified number (eight balls in the example) of compression balls 6 into the through holes 13 of the assembled main support rod 1 and extension rod 2. These compression balls 6 can roll slightly within the holes in a free state, but when subjected to radial compression, they will protrude from the surface of the rod as rigid fulcrums.

[0041] Insert the cylindrical compression spring 5 onto the force transmission column 3. Then, insert the movable hammer 4 from the top of the force transmission column 3, pressing it onto the spring. The inner hole of the movable hammer 4 and the outer surface of the force transmission column 3 are clearance-fitted to ensure free sliding. Screw the connecting column 10 at the bottom of the force transmission column 3 into the mounting hole 8 in the center of the main support rod 1. Note: During initial installation, only screw it in a few turns to ensure it does not loosen; do not tighten it completely. This is a crucial preparatory state, leaving room for subsequent anchoring operations.

[0042] Place the assembled device vertically into the inner hole of the bearing to be disassembled, ensuring the bottom of the device contacts or approaches the bearing end face. At this point, initially tighten the force transmission column 3 by hand or with a tool. As the force transmission column 3 moves downward, its conical or rounded bottom will press against the clamping ball 6, forcing the clamping ball 6 to move radially outward and slightly embed into the surface of the bearing inner ring, forming initial anchoring. To ensure consistent and controllable anchoring force, it is recommended to use a torque wrench to finally tighten the force transmission column 3 to the preset torque value. At this point, the device is tightly engaged with the bearing inner ring via the clamping ball 6, becoming a single unit.

[0043] The operator holds the movable hammer 4 by its grip and presses it downwards along the axis of the force transmission column 3. At this time, the cylindrical compression spring 5 is compressed and stores energy.

[0044] Observe the spring compression scale 14 on the surface of the force transmission column 3, and press the movable hammer 4 down to the scale position corresponding to the required impact energy. Quickly release the movable hammer 4. The compressed spring is released instantly, pushing the movable hammer 4 upward and accelerating it, causing it to strike the top of the force transmission column 3 (or the nut) with great kinetic energy. This impact generates a stress wave, which passes through the force transmission column 3 and the main support rod 1, and finally acts on the anchored clamping ball 6, converting it into an upward impact force. Perform multiple impacts. Each impact will cause the bearing to undergo a micron-level displacement, eventually completely destroying the static friction between it and the mating parts. When you hear or feel the bearing loosening, you can stop the impact. At this time, the bearing can be easily removed manually or with auxiliary tools.

[0045] The main support rod 1 and extension rod 2 are made of high-hardness stainless steel (38-42 HRC), ensuring that the rods will not deform or be damaged when subjected to huge impact tension and the compression of the pressure ball 6. The internal through hole 13 is designed not only to accommodate the pressure ball 6, but also to form a force transmission path.

[0046] The force transmission column 3 and the movable hammer 4 are made of high-temperature alloy (σb ≥ 1100 MPa), providing extremely high impact toughness and strength, preventing fracture or plastic deformation under repeated impacts. The molybdenum disulfide lubricating layer on the contact surface greatly reduces friction between the movable hammer 4 and the force transmission column 3, ensuring efficient transmission of impact energy and preventing jamming.

[0047] The cylindrical compression spring 5, made of spring steel, ensures a high fatigue life, capable of withstanding tens of thousands of compression cycles. The molybdenum disulfide layer on its surface not only prevents rust but also reduces friction with the force transmission column 3 and the movable hammer 4. The spring compression scale 14 is the core component for achieving "controllable" impact; it quantifies the abstract "force magnitude" into precise graduations, ensuring the consistency of impact loads for each impact and is crucial for achieving non-destructive disassembly.

[0048] The clamping ball 6 is made of high-hardness bearing steel (61-65 HRC) to ensure that it will not break or wear excessively during extrusion and impact, and can effectively "bite" the inner ring of the bearing without slipping.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A controllable impact load bearing non-destructive disassembly device, characterized in that: Includes main support rod, extension rod, force transmission column, movable hammer, and cylindrical compression spring; The main support rod and the extension rod are connected by a horizontal thread, and the force transmission column is set with a vertical thread on the main support rod. A cylindrical compression spring is sleeved on the force transmission column. One end of the cylindrical compression spring sleeve is connected to the main support rod, and the other end is connected to the movable hammer. The movable hammer is movably mounted on the force transmission column. Both the main support rod and the extension rod have through holes inside for placing the pressure ball; Several clamping balls are installed in the through holes inside the main support rod and the extension rod.

2. The controllable impact load bearing non-destructive disassembly device according to claim 1, characterized in that: The main support rod is provided with mounting holes for installing force transmission columns, and the mounting holes are provided with a first internal thread. The bottom of the force transmission column is provided with a connecting column corresponding to the mounting holes, and the connecting column is provided with a first external thread corresponding to the first internal thread.

3. The controllable impact load bearing non-destructive disassembly device according to claim 1, characterized in that: One end of the main support rod is provided with a ring platform for connecting with the extension rod; the ring platform is provided with a second external thread.

4. The controllable impact load bearing non-destructive disassembly device according to claim 3, characterized in that: One end of the extension rod is provided with an annular groove corresponding to the annular platform, and the annular groove is provided with a second internal thread corresponding to the second external thread.

5. The controllable impact load bearing non-destructive disassembly device according to claim 1, characterized in that: The surface of the force transmission column is equipped with a spring compression scale.

6. The controllable impact load bearing non-destructive disassembly device according to claim 1, characterized in that: A nut is provided at the end of the force transmission column away from the main support rod.

7. The controllable impact load bearing non-destructive disassembly device according to claim 1, characterized in that: The main support rod and extension rod are made of stainless steel with a hardness of 38-42 HRC.

8. The controllable impact load bearing non-destructive disassembly device according to claim 1, characterized in that: The force transmission column and the movable hammer are made of high-temperature alloy with a tensile strength σb≥1100MPa, and the contact surfaces of the force transmission column and the movable hammer are coated with a molybdenum disulfide lubricating layer.

9. The controllable impact load bearing non-destructive disassembly device according to claim 1, characterized in that: The cylindrical compression spring is made of spring steel and has a molybdenum disulfide coating on its surface.

10. The controllable impact load bearing non-destructive disassembly device according to claim 1, characterized in that: The clamping ball is a bearing steel ball with a hardness of 61-65 HRC after heat treatment.

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