All-metal screw rod large torque bearing structure

Abstract

The present application relates to the technical field of bearing, especially to a full-metal screw rod large-torque bearing structure, comprising: an inner ring, an outer ring, the outer ring is sleeved on the outer side of the inner ring, and the two are concentrically arranged, a supporting ring is integrally formed on one side of the inner wall of the outer ring, a first annular groove is formed on one side of the surface of the supporting ring, a ring-shaped plate is attached to the inner surface of the outer ring, a second annular groove is formed on one side of the surface of the ring-shaped plate facing the supporting ring, and a plurality of cylindrical rollers are arranged at equal intervals in the gap between the inner ring and the outer ring, and the limiting shaft necks at both ends of the cylindrical rollers extend into the first annular groove and the second annular groove respectively. The present application realizes self-adaptive load balancing of the cylindrical rollers through the elastic separation structure, can absorb the impact torque generated during the start-stop and reversal of the screw rod, reduces the structural fatigue damage caused by rigid impact, and greatly prolongs the service life of the bearing structure under large-torque working conditions.

Description

Technical Field

[0001] This invention relates to the field of bearing technology, specifically to an all-metal screw high-torque bearing structure. Background Technology

[0002] Metal screw drives with large pitch rely on torque transmission for linear reciprocating drive. To ensure the screw's load-bearing capacity, positioning accuracy, and operational stability, high-torque cylindrical roller bearings are typically fitted externally. These bearings provide radial load bearing, constrain the screw's radial runout, and withstand alternating impact loads generated during equipment start-up, shutdown, and reversal. Currently, most cylindrical roller bearings used in metal screw drives employ a classic structure with an integrated rigid cage for the inner and outer rings. The cylindrical rollers are axially limited by integrated flanges on both sides of the inner and outer rings, and the circumferentially separated and positioned by the riveted rigid cage. This ensures that the rollers are evenly distributed along the raceway and roll stably.

[0003] Because metal screws are subjected to large torque alternating loads for a long time, they will undergo slight bending deformation. The frictional heat generated by continuous operation of the equipment will cause thermal expansion of the screw and the inner and outer rings of the bearing. The pocket position of the traditional one-piece rigid cage is fixed and cannot be finely adjusted. It cannot adaptively adjust the stress position of the rollers according to the coaxiality deviation of the screw. It is very easy for a few cylindrical rollers to bear the majority of the radial load. Severe stress concentration occurs at the contact position between the rollers and the inner and outer ring raceways. Damage such as raceway pitting and fatigue spalling of the roller surface will occur in a short time. At the same time, the rigid cage cannot buffer the impact torque generated at the moment of screw reversal. The impact force acts directly on the cage and rollers, which can easily cause the cage to crack and deform. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide an all-metal screw high-torque bearing structure to solve the problems mentioned in the background art, such as the inability of rigid cages to adapt to screw eccentricity and thermal deformation, which easily leads to localized off-center wear and short bearing service life.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an all-metal screw high-torque bearing structure, comprising: Inner ring; The outer ring is sleeved on the outside of the inner ring and the two are arranged concentrically. A support ring is integrally formed on one side of the inner wall of the outer ring, and a first annular groove is formed on one side surface of the support ring. An annular plate is attached to the inner surface of the outer ring, and a second annular groove is formed on the side surface of the annular plate facing the supporting ring. Cylindrical rollers, wherein the number of cylindrical rollers is several, and the several cylindrical rollers are arranged at equal intervals in the gap between the inner ring and the outer ring, and the limiting journals at both ends of the cylindrical rollers extend into the first annular groove and the second annular groove respectively. Among them, the annular plate is fixedly installed on the side facing the supporting ring with the same number of fixed arc plates as the cylindrical rollers. Each fixed arc plate has a telescopic spring connected to its outer convex surface, and one end of the telescopic spring is connected to a movable arc plate.

[0006] Preferably, the concave curvature of both the fixed arc plate and the movable arc plate is adapted to the curvature of the outer cylindrical surface of the cylindrical roller.

[0007] Preferably, the telescopic spring is arranged in an arc shape, and its curvature matches the arc of the annular trajectory formed by the arrangement of the cylindrical rollers between the inner and outer rings.

[0008] Preferably, the movable arc plate is divided into a force-bearing section, a main body section, and a guide section along its own extension direction from one end near the annular plate to the other end. The force-bearing section extends into the interior of the second annular groove, and the guide section extends obliquely from one end near the main body section toward the end toward the fixed arc plate.

[0009] Preferably, the surface of the annular plate is provided with an arc-shaped through groove, the number of which is the same as the number of movable arc-shaped plates. The arc-shaped through groove is connected to the second annular groove. A toggle ring is provided on the side of the annular plate away from the support ring. Several push blocks are installed on the toggle ring, which pass through the arc-shaped through groove and extend into the second annular groove.

[0010] Preferably, each of the push blocks is located on one side of the concave surface of the corresponding movable arc plate.

[0011] Preferably, the outer ring has an arc-shaped groove on the side near the annular plate, and the inner wall of the arc-shaped groove has an outwardly extending through hole. The actuating ring has an integrally formed fitting block that matches the arc-shaped groove, and a spring pin is installed inside the fitting block.

[0012] Preferably, the outer surface of the inner ring is integrally formed with two sets of stop rings, and the distance between the two sets of stop rings is consistent with the length of the cylindrical roller, the distance between the support ring and the annular plate.

[0013] By employing the above technical solution, the present invention provides an all-metal screw high-torque bearing structure, which has at least the following beneficial effects: 1. This invention employs a combination of fixed arc-shaped plates, arc-shaped telescopic springs, and movable arc-shaped plates to form multiple sets of elastic separation components. Adjacent cylindrical rollers are flexibly limited by the elastic separation components. When the metal screw undergoes eccentric deformation or thermal expansion deformation, causing the rollers to be subjected to eccentric loads, the telescopic spring at the position with greater force can undergo slight compression and yielding, evenly distributing the localized concentrated load to the remaining sets of cylindrical rollers, achieving synchronous bearing of all rollers, and effectively avoiding fatigue wear of the raceway and rollers caused by localized stress concentration. In addition, the arc-shaped arrangement of the telescopic springs can absorb the impact torque generated during the start-up, shutdown, and reversal of the screw, reducing structural fatigue damage caused by rigid impacts, and significantly improving the continuous and stable operating time of the bearing under high torque alternating load conditions.

[0014] 2. This invention achieves precise axial positioning by opening a first annular groove in the outer ring support ring and setting a second annular groove in the annular plate. The limiting journals machined at both ends of the cylindrical roller are respectively embedded in the two sets of annular grooves. At the same time, two sets of axial stop rings are integrally formed on the outer wall of the inner ring. The spacing between the stop rings matches the axial length of the roller, achieving a second layer of axial protection and positioning from both ends of the roller. The double positioning structure can resist the axial alternating impact force under high torque conditions, constraining the cylindrical roller to always be limited inside the raceway, and preventing the roller from axially moving, hitting the retaining edge, or falling out of the raceway.

[0015] 3. By setting up a toggle ring, push block, and arc-shaped through groove structure, the present invention can compress the telescopic spring by squeezing the movable arc plate with the circumferentially rotating toggle ring before assembly, thereby narrowing the overall width of the elastic separator component. The separator component can be smoothly inserted into the gap between adjacent rollers without the need for professional eccentric tooling. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention; Figure 3 This is a schematic diagram of the disassembled structure of the present invention; Figure 4 This is a schematic diagram of the outer ring structure of the present invention; Figure 5 This is a schematic diagram of the structure of the annular plate and the movable arc plate of the present invention; Figure 6 This is a schematic diagram of the structure of the actuating ring and the annular plate of the present invention.

[0017] In the diagram: 100, Inner ring; 101, Stop ring; 200, Outer ring; 201, Support ring; 202, First annular groove; 203, Arc-shaped groove; 204, Through hole; 300, Annular plate; 301, Second annular groove; 302, Fixed arc-shaped plate; 303, Telescopic spring; 304, Movable arc-shaped plate; 3041, Force-bearing section; 3042, Main body section; 3043, Guide section; 305, Arc-shaped through groove; 400, Cylindrical roller; 401, Limiting journal; 500, Actuating ring; 501, Push block; 502, Fitting block; 503, Spring pin. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present 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 present invention.

[0019] Example 1 Please see Figures 1-6This application discloses an all-metal screw high-torque bearing structure. The outer ring 200 of this bearing structure is integrally fitted onto the outer side of the inner ring 100, with both arranged concentrically. A plurality of cylindrical rollers 400 are equidistantly arranged within the gap between the inner ring 100 and the outer ring 200. To ensure that the axial position of the cylindrical rollers 400 does not shift, a support ring 201 is integrally formed on one side of the inner wall of the outer ring 200. A first annular groove 202 is formed on one side surface of the support ring 201. Additionally, an annular plate 300 is provided on the inner surface of the outer ring 200. A second annular groove 301 is formed on the side surface of the annular plate 300 facing the support ring 201. When the cylindrical rollers 400 are inserted into the gap formed by the inner ring 100 and the outer ring 200, the limiting journals 401 at both ends extend into the first annular groove 202 and the second annular groove 301, respectively. This design ensures that the cylindrical rollers 400 roll purely along the two sets of annular grooves while preventing axial movement and slippage. Furthermore, to further enhance the axial limiting effect of the cylindrical rollers 400, two sets of stop rings 101 are integrally formed on the outer surface of the inner ring 100. The spacing between the two sets of stop rings 101 is consistent with the length of the cylindrical rollers 400, the spacing between the support ring 201 and the annular plate 300. The stop rings 101 on both sides provide axial blocking and limiting for the cylindrical rollers 400. Combined with the locking structure between the end-limiting journals 401 and the two sets of annular grooves, this design comprehensively prevents axial slippage of the cylindrical rollers 400 under high torque operating conditions, ensuring the overall operational stability of the bearing structure. Simultaneously, it effectively prevents axial displacement or detachment of the inner ring 100 due to torque.

[0020] Following the above, fixed arc-shaped plates 302, in the same number as cylindrical rollers 400, are fixedly installed on the side of the annular plate 300 facing the supporting ring 201. Each fixed arc-shaped plate 302 has a telescopic spring 303 connected to its outer convex surface, and one end of the telescopic spring 303 is connected to a movable arc-shaped plate 304. A single set of fixed arc plate 302, telescopic spring 303, and movable arc plate 304 together constitute a set of elastic separation components. Multiple sets of separation components are arranged one-to-one between two adjacent cylindrical rollers 400. With the limiting effect of the elastic separation components, all cylindrical rollers 400 are evenly separated, replacing the limiting method of the traditional integrated rigid cage. The elastic deformation capability of the telescopic spring 303 is used to achieve adaptive force adjustment. When the metal screw undergoes eccentric deformation or thermal expansion deformation, the telescopic spring 303 at the location with greater local force can undergo slight compression and release, allowing the load of the cylindrical roller 400 at that location to be distributed to the adjacent rollers, achieving uniform load distribution on all cylindrical rollers 400. This avoids the problem of pitting and crushing failure caused by a few cylindrical rollers 400 bearing heavy loads for a long time, thereby extending the service life of the bearing under high torque conditions.

[0021] Specifically, the concave curvature of the fixed arc plate 302 and the movable arc plate 304 are adapted to the curvature of the outer cylindrical surface of the cylindrical roller 400. The two can achieve large-area contact with the outer circumferential surface of the cylindrical roller 400, which can stably limit the circumferential displacement range of the cylindrical roller 400 and disperse local contact stress, thereby increasing the overall torque load capacity of the bearing.

[0022] More specifically, the telescopic spring 303 is arranged in an arc shape, and its curvature matches the arc of the annular trajectory formed by the arrangement of the cylindrical rollers 400 between the inner ring 100 and the outer ring 200. This ensures that the direction of force on the telescopic spring 303 during compression and rebound deformation is always along the tangent of the bearing ring, avoiding the problem of twisting, bending, and fatigue damage to the telescopic spring 303. At the same time, it ensures that the long-term stable adaptive compensation and buffering and shock absorption effect of the elastic separation component effectively absorbs the impact load generated during the instantaneous reversal of the screw.

[0023] Example 2 Following the above embodiment one, as Figure 2 , Figure 3 and Figures 5-6 As shown, the movable arc plate 304 extends along its own direction, from one end near the annular plate 300 to the other end, and is divided into a force-bearing section 3041, a main body section 3042, and a guide section 3043. The force-bearing section 3041 extends into the interior of the second annular groove 301, allowing the movable arc plate 304 to move along the trajectory of the second annular groove 301 when pushed by an external force, that is, to move along the annular direction of this bearing structure. The main body section 3042 is the core load-bearing structure section of the movable arc plate 304, mainly used to transmit the spring preload, and at the same time cooperates with the fixed arc plate 302 to clamp and limit the cylindrical rollers 400. The guide section 3043 extends inclinedly from one end near the main body section 3042 toward the end toward the fixed arc plate 302 to form a guide slope, so that the distance between its tail end and the fixed arc plate 302 is relatively small. Therefore, during the process of inserting the elastic separator into the gap between adjacent cylindrical rollers 400, the gap between adjacent cylindrical rollers 400 can be slightly arbitrary and does not need to be completely equal, thereby improving assembly efficiency.

[0024] Following the above, in order to achieve precise circumferential compression of the force-bearing section 3041 of the movable arc plate 304, an arc-shaped through groove 305, the same number as the movable arc plate 304, is provided on the surface of the annular plate 300. The arc-shaped through groove 305 is connected to the second annular groove 301. In addition, a toggle ring 500 is provided on the side of the annular plate 300 away from the supporting ring 201. Multiple sets of push blocks 501 are fixedly installed on the side of the toggle ring 500 facing the annular plate 300. The number of push blocks 501 corresponds one-to-one with the movable arc plate 304. Each set of push blocks 501 can slide along the arc-shaped trajectory of the arc-shaped through groove 305 and finally extend into the interior of the second annular groove 301 and abut against the concave surface of the corresponding force-bearing section 3041 of the movable arc plate 304. Before officially pushing the annular plate 300 and the multiple sets of elastic partition components mounted on it into the bearing, the operator can rotate the actuating ring 500 around the bearing's central axis relative to the annular plate 300. During the rotation of the actuating ring 500, all the push blocks 501 will move synchronously along the arc-shaped through groove 305 in a circumferential arc shape. During the movement, the push blocks 501 continuously apply lateral pushing force to the force-bearing section 3041 of the movable arc plate 304, causing each movable arc plate 304 to laterally compress the telescopic spring 303 towards the corresponding fixed arc plate 302. The overall width of each set of elastic partition components will then shrink synchronously. The narrow assembly gap originally located between adjacent cylindrical rollers 400 can easily accommodate the folded elastic partition components. The operator can complete the alignment and insertion assembly of the components without the need for complex tooling. This greatly simplifies the bearing assembly process. Furthermore, when the cylindrical rollers 400 of the bearing experience wear or damage, the pusher 501 can be pushed in a circumferential direction by rotating the actuating ring 500 in the reverse direction. This allows the elastic separation components to be retracted, and the annular plate 300 and all the separation components can be removed directly from one side of the bearing. This facilitates the individual replacement of the damaged cylindrical rollers 400 without having to disassemble the entire metal screw from the equipment, thereby effectively reducing the later maintenance costs of heavy-duty screw drive equipment.

[0025] Example 3 After the operator completes the insertion and assembly of the elastic separator component and releases the circumferential torsional force of the actuating ring 500, if a corresponding locking and limiting structure is lacking, the actuating ring 500 is prone to unexpected circumferential offset rotation under the vibration generated by the high-torque reciprocating operation of the equipment, and may even detach from the outer ring 200. To effectively solve this problem, such as Figures 3-6As shown, in this embodiment, an arc-shaped groove 203 is provided on the side of the outer ring 200 near the annular plate 300, and a through hole 204 extending radially outward along the inner wall of the arc-shaped groove 203 is provided; and a fitting block 502 adapted to the arc-shaped groove 203 is integrally formed on the actuating ring 500, and a spring pin 503 is installed inside the fitting block 502. After the operator rotates the actuating ring 500 to the assembly unlock position and completes the insertion and assembly of the elastic separator component, the actuating ring 500 is rotated in the opposite direction, causing the interlocking block 502 to slide back along the arc-shaped groove 203. When the actuating ring 500 rotates back to the initial locking position, the spring pin 503 will pop out from inside the interlocking block 502 under its own elastic force and lock into the through hole 204 of the outer ring 200. The interlocking and limiting effect of the spring pin 503 and the through hole 204 locks the circumferential relative position between the interlocking block 502 and the outer ring 200, thereby achieving circumferential locking and positioning of the actuating ring 500 and preventing the actuating ring 500 from being accidentally deflected by vibration during equipment operation. At the same time, several push blocks 501 move along with it, releasing the compressive force on the telescopic spring 303.

[0026] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-torque all-metal screw bearing structure, characterized in that, include: Inner ring (100); Outer ring (200), the outer ring (200) is sleeved on the outside of the inner ring (100) and the two are arranged concentrically. A support ring (201) is integrally formed on one side inner wall of the outer ring (200), and a first annular groove (202) is opened on one side surface of the support ring (201). An annular plate (300) is attached to the inner surface of the outer ring (200), and a second annular groove (301) is provided on the side surface of the annular plate (300) facing the supporting ring (201). Cylindrical rollers (400), the number of which is several, the several cylindrical rollers (400) are arranged at equal intervals in the gap between the inner ring (100) and the outer ring (200), and the limiting journals (401) at both ends of the cylindrical rollers (400) extend into the first annular groove (202) and the second annular groove (301) respectively; Among them, the annular plate (300) facing the support ring (201) is fixedly installed with a fixed arc plate (302) with the same number as the cylindrical roller (400). Each fixed arc plate (302) has a telescopic spring (303) connected to its outer convex surface, and one end of the telescopic spring (303) is connected to a movable arc plate (304).

2. The all-metal screw high-torque bearing structure according to claim 1, characterized in that: The concave curvature of the fixed arc plate (302) and the movable arc plate (304) are both adapted to the curvature of the outer cylindrical surface of the cylindrical roller (400).

3. The all-metal screw high-torque bearing structure according to claim 1, characterized in that: The telescopic spring (303) is arranged in an arc shape, and its curvature matches the arc of the annular trajectory formed by the arrangement of the cylindrical rollers (400) between the inner ring (100) and the outer ring (200).

4. The all-metal screw high-torque bearing structure according to claim 1, characterized in that: The movable arc plate (304) extends along its own direction, from one end near the annular plate (300) to the other end, it is divided into a force-bearing section (3041), a main body section (3042) and a guide section (3043). The force-bearing section (3041) extends into the interior of the second annular groove (301), and the guide section (3043) extends obliquely from one end near the main body section (3042) toward the end towards the fixed arc plate (302).

5. The all-metal screw high-torque bearing structure according to claim 4, characterized in that: The surface of the annular plate (300) is provided with an arc-shaped through groove (305) in the same number as the movable arc-shaped plate (304). The arc-shaped through groove (305) is connected to the second annular groove (301). A toggle ring (500) is provided on the side of the annular plate (300) away from the support ring (201). Several push blocks (501) are installed on the toggle ring (500) respectively passing through the arc-shaped through groove (305) and extending into the interior of the second annular groove (301).

6. The all-metal screw high-torque bearing structure according to claim 5, characterized in that: Each of the push blocks (501) is located on one side of the concave surface of the corresponding movable arc plate (304).

7. The all-metal screw high-torque bearing structure according to claim 6, characterized in that: An arc-shaped groove (203) is provided on the side of the outer ring (200) near the annular plate (300), and an outwardly extending through hole (204) is provided on the inner wall of the arc-shaped groove (203). The actuating ring (500) has an integrally formed fitting block (502) adapted to the arc-shaped groove (203), and a spring pin (503) is installed inside the fitting block (502).

8. The all-metal screw high-torque bearing structure according to claim 1, characterized in that: The outer surface of the inner ring (100) is integrally formed with two sets of stop rings (101). The distance between the two sets of stop rings (101) is consistent with the length of the cylindrical roller (400), the distance between the support ring (201) and the annular plate (300).

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