Nut structure with error absorption function and linear driving device
By incorporating multiple adjustment slots and elastic support components on the flange cylinder, the problem of sluggish operation caused by errors in the ball screw structure is solved, resulting in higher operational smoothness and service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU HENGLI PRECISION IND CO LTD
- Filing Date
- 2025-07-11
- Publication Date
- 2026-07-03
AI Technical Summary
Existing ball screw structures are susceptible to concentricity and taper errors during use, leading to poor slider operation and reduced service life.
A nut structure with error absorption function was designed, which includes setting multiple adjustment slots and elastic supports on the flange cylinder. The adjustment slots realize multi-directional bending deformation to absorb errors, and the elastic supports are used to adjust the distance between the flange and the nut seat, thereby reducing the assembly accuracy requirements.
It improves the smoothness of slider operation, extends service life, reduces assembly costs and wear, and avoids the generation of internal loads.
Smart Images
Figure CN224453568U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of linear actuator technology, and in particular to a nut structure with error absorption function and a linear drive device. Background Technology
[0002] In practical applications, ball screws typically require the use of guide rails. The screw, as the driving component, is placed in the center of the worktable, with linear guide rails on both sides for load bearing and motion guidance. The ball screw nut is connected and fixed to the nut seat via a flange, and the nut seat and the sliders on both sides are connected and fixed to the work platform.
[0003] The ball screw shaft is mounted via bearing housings at the front and rear ends. The concentricity of the two bearing housings (fixed / supporting sides) is affected by their own machining errors and the assembly precision between various components, ultimately impacting the straightness of the screw shaft and its parallelism relative to the linear guides on both sides. This leads to:
[0004] 1. Ball screws are difficult to install, requiring high precision in the installation of components such as bearing housings. The assembly process requires repeated self-alignment, resulting in high assembly costs and low efficiency. In particular, the assembly difficulty is greatly increased for long-stroke ball screws, requiring additional precision adjustments to the bearing housings.
[0005] 2. Due to the parallelism error of the guide rails on both sides throughout the entire stroke range, as well as the taper error of the lead screw shaft itself, the nut will tilt relative to the lead screw shaft at different stroke positions, which will cause the nut to jam. The steel ball will generate additional internal load, which will aggravate the wear of the lead screw, damage the overall running accuracy, generate noise, and shorten the service life of the lead screw. Utility Model Content
[0006] The technical problem to be solved by this utility model is that the existing ball screw structure is easily affected by structural concentricity and screw taper error in application, which leads to poor slider operation and reduced service life.
[0007] Therefore, this utility model provides a nut structure with error absorption function and a linear drive device.
[0008] The technical solution adopted by this utility model to solve its technical problem is:
[0009] A nut structure with error absorption function includes,
[0010] Nut seat, and
[0011] Nut body, wherein the nut body is disposed within the nut seat;
[0012] A flange, comprising a flange plate and a flange sleeve, wherein the flange plate is connected to one end of the flange sleeve, the flange sleeve is connected to a nut body, and the flange plate is connected to the end of a nut seat;
[0013] The flange cylinder has multiple adjustment slots on its side wall, and these adjustment slots face multiple directions.
[0014] Furthermore, the plurality of adjustment seams are distributed along the axial direction of the flange cylinder, and the plurality of adjustment seams are staggered.
[0015] Furthermore, a threaded cylinder is coaxially provided at the end of the nut body, the threaded cylinder is provided with external threads, the flange cylinder is provided with internal threads, and the threaded cylinder is inserted into the flange cylinder and threadedly connected to the flange cylinder.
[0016] Furthermore, it also includes an elastic support member located between the flange plate and the end face of the nut seat, the elastic support member being used to adjust the distance between the flange plate and the end face of the nut seat.
[0017] Furthermore, the elastic support member is configured as a leaf spring.
[0018] Furthermore, the leaf spring is sleeved on the flange cylinder and located between the flange plate and the end face of the nut seat.
[0019] Furthermore, a screw is connected to the flange, and the screw passes through the flange plate, the leaf spring and the nut seat.
[0020] A linear drive device, comprising,
[0021] Base, and
[0022] The lead screw is rotatably connected to the base via a bracket;
[0023] The nut structure with error absorption function as described above has the nut body threadedly connected to the lead screw;
[0024] The guide rail is parallel to the lead screw and is mounted on the base. A slider that cooperates with the guide rail is also mounted on the guide rail.
[0025] A slide table, which is connected to a nut seat and a slider;
[0026] A drive device is connected to one end of a lead screw and is used to drive the lead screw to rotate.
[0027] Furthermore, multiple guide rails are provided, and the multiple guide rails are respectively arranged on both sides of the lead screw.
[0028] Furthermore, each of the guide rails has multiple sliders arranged along its length.
[0029] The beneficial effect of this utility model is that by setting multiple adjustment slots with different orientations on the flange cylinder, the flange cylinder can achieve multi-directional bending deformation. Thus, when the bearing seats at both ends of the lead screw are not concentric, causing concentricity error of the lead screw, or when the lead screw itself has a taper error, the nut body can absorb the error at any position on the lead screw shaft through the adjustment slots on the flange. This avoids the internal load caused by the relative tilt of the nut body and the lead screw shaft, thereby improving the smoothness of the structure's operation and service life.
[0030] Furthermore, this application incorporates a leaf spring between the flange plate and the nut seat, which significantly reduces the assembly precision requirements of the flange mounting surface and the outer surface of the nut seat. The leaf spring can absorb the effects of misalignment during nut assembly caused by the machining tolerances of the flange and nut seat themselves. Attached Figure Description
[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0032] Figure 1 This is a schematic diagram of the linear drive device in this utility model.
[0033] Figure 2 This is a schematic diagram of the nut structure with error absorption function in this utility model.
[0034] Figure 3 This is a schematic diagram of the assembly relationship between the nut and the nut seat in this utility model.
[0035] Figure 4 This is a schematic diagram of the flange structure in this utility model.
[0036] In the diagram: 1. Nut seat; 2. Nut body; 3. Threaded cylinder; 4. Flange; 5. Flange plate; 6. Flange cylinder; 7. Elastic support; 8. Adjustment joint; 9. Base; 10. Lead screw; 11. Guide rail; 12. Slider; 13. Slide table; 14. Drive device. Detailed Implementation
[0037] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.
[0038] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model 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 this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0040] Reference Figure 1 A linear drive device includes a base 9, a lead screw 10, a nut structure, a slide table 13, and a drive device 14. The lead screw 10 is connected to the base 9 by a bracket located at both ends of the lead screw 10. The drive device 14 is mounted on the base 9 and connected to one end of the lead screw 10 for driving the lead screw 10 to rotate.
[0041] The nut structure includes a nut seat 1 and a nut body 2. The nut body 2 is disposed inside the nut seat 1 and is threadedly connected to the lead screw 10. The slide table 13 is fixedly connected to the nut seat 1.
[0042] The base 9 is provided with multiple guide rails 11, which are parallel to the lead screw 10. The guide rails 10 are respectively located on both sides of the lead screw 10. Each guide rail 11 has multiple sliders 12 along its length. The sliders 12 slide along the length of the guide rail 11 and are connected to the slide table 13. The slide table 13 is supported by the multiple sliders 12, which improves the stability of the slide table 13.
[0043] Reference Figure 2 , 3This application provides a nut structure with error absorption function, which also includes a flange 4 and an elastic support 7. The flange 4 is connected to one side of the nut body 2. The flange 4 includes an integrally formed flange plate 5 and flange cylinder 6. The flange cylinder 6 is connected to the nut. The flange plate 5 covers one end of the nut seat 1. The elastic support 7 is disposed between the flange plate 5 and the end face of the nut seat 1.
[0044] It should be noted that, referring to Figure 4 A threaded cylinder 3 is coaxially mounted on the end of the nut. The threaded cylinder 3 has external threads, and the flange cylinder 6 has internal threads. The threaded cylinder 3 is inserted into the flange cylinder 6 and threadedly connected to it. Multiple adjusting slots 8 are provided on the outer wall of the connecting pipe. Each adjusting slot 8 is arc-shaped and arranged along the axial direction of the connecting pipe. The midpoints of the multiple adjusting slots 8 face different directions, i.e., they are staggered. This allows for micro-deformation of the flange 4 in any direction. When the bearing seats at both ends of the lead screw are not concentric, causing a concentricity error in the lead screw, or when the lead screw itself has a taper error, the nut body 2 can absorb this error at any position on the lead screw shaft through the adjusting slots 8 on the flange, thus avoiding the internal load of tension caused by relative tilting between the nut body 2 and the lead screw shaft.
[0045] The elastic support 7 is a leaf spring used to adjust the distance between the flange plate 5 and the end face of the nut seat 1. The leaf spring is sleeved on the flange cylinder 6, located between the end faces of the flange plate 5 and the nut seat 1. A screw is connected to the flange 4, passing through the flange plate 5, the leaf spring, and connecting to the nut seat 1. The leaf spring significantly reduces the assembly accuracy requirements of the flange 4 mounting surface and the outer surface of the nut seat 1. The leaf spring can absorb the effect of misalignment in nut assembly caused by the machining tolerances of the flange 4 and the nut seat 1. At the same time, since the leaf spring is compressed between the flange 4 and the nut seat 1, it has its own internal elastic potential energy, so the connection rigidity between the flange 4 and the bearing housing is not affected.
[0046] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined by the scope of the claims.
Claims
1. A nut structure with error absorption function, characterized in that, include, Nut seat (1), and Nut body (2), the nut body (2) is disposed inside the nut seat (1); Flange (4), the flange (4) includes a flange plate (5) and a flange cylinder (6), the flange plate (5) is connected to one end of the flange cylinder (6), the flange cylinder (6) is connected to the nut body (2), and the flange plate (5) is connected to the end of the nut seat (1); The flange cylinder (6) has multiple adjustment slots (8) on its side wall, and the multiple adjustment slots (8) face multiple directions.
2. The nut structure having an error absorbing function according to claim 1, characterized by, Multiple adjustment slots (8) are distributed along the axial direction of the flange cylinder (6), and the multiple adjustment slots (8) are staggered.
3. The nut structure having an error absorbing function according to claim 1, characterized by, The end of the nut body (2) is coaxially provided with a threaded cylinder (3), the threaded cylinder (3) is provided with external threads, the flange cylinder (6) is provided with internal threads, the threaded cylinder (3) is inserted into the flange cylinder (6) and is threadedly connected to the flange cylinder (6).
4. The nut structure having an error absorbing function according to claim 1, characterized by, It also includes an elastic support (7), which is located between the flange plate (5) and the end face of the nut seat (1). The elastic support (7) is used to adjust the distance between the flange plate (5) and the end face of the nut seat (1).
5. The nut structure having an error absorbing function according to claim 4, characterized by, The elastic support (7) is configured as a leaf spring.
6. The nut structure having an error absorbing function according to claim 5, wherein The leaf spring is sleeved on the flange cylinder (6) and located between the flange plate (5) and the end face of the nut seat (1).
7. The nut structure having an error absorbing function according to claim 5, wherein The flange (4) is connected to a screw, which passes through the flange plate (5), the leaf spring and the nut seat (1).
8. A linear drive apparatus characterized by comprising: include, Base (9), and A lead screw (10) is rotatably connected to a base (9) via a bracket; The nut structure with error absorption function as described in any one of claims 1-7, wherein the nut body (2) is threadedly connected to the lead screw (10); The guide rail (11) is parallel to the lead screw (10), the guide rail (11) is mounted on the base (9), and the guide rail (11) is provided with a slider (12) that cooperates with it; The slide (13) is connected to the nut seat (1) and the slider (12); A drive device (14) is connected to one end of a lead screw (10) and is used to drive the lead screw (10) to rotate.
9. The linear drive apparatus according to claim 8, characterized by Multiple guide rails (11) are provided, and the multiple guide rails (11) are respectively arranged on both sides of the lead screw (10).
10. The linear drive apparatus according to claim 9, characterized by Each of the guide rails (11) has a plurality of sliders (12) arranged along its length.