Nut-type gearless constant lead planetary roller screw

Abstract

The utility model discloses a nut type gearless constant lead planetary roller screw relates to roller screw technical field, including the bottom plate, the top of bottom plate is provided with the guide component, the guide component includes the guide post fixedly connected in the bottom plate top through the support, the inner wall of guide post is established respectively with first guide groove and second guide groove, the outside of guide post is connected with the retainer of sliding, the utility model discloses beneficial effect is: through setting up guide component can solve the problem that traditional nut type screw more adopt sliding friction or single roller guide, the friction coefficient is high, and the problem of quick wearing, avoids the local stress concentration, prevents the failure caused by single point wear, and the reliability is higher, realizes the multidirectional load balanced dispersion, prolongs the service life of roller, and utilizes the collaborative restraint of double guide groove, provides the motion reliability.

Description

Technical Field

[0001] This utility model relates to the field of roller screw technology, and in particular to a nut-type gearless constant lead planetary roller screw. Background Technology

[0002] Planetary roller screws are a new type of helical transmission mechanism that combines planetary transmission and helical transmission in recent years. Their motion principle and structural characteristics integrate the motion principles or structures of planetary gears, helical mechanisms, ball screws and needle roller bearings, giving them advantages over ball screws such as larger load capacity, longer life, higher speed and wider lead. They have been widely used, and the nut-type planetary roller screw has become one of the most popular forms due to its constant lead and more compact structure.

[0003] Nut-type gearless constant lead planetary roller screws play an irreplaceable role in high-end manufacturing equipment and industrial automation due to their superior load-bearing capacity, rigidity, low noise, and low vibration. However, traditional nut-type gearless constant lead planetary roller screws often employ sliding friction or single-roller guidance, resulting in high friction coefficients and rapid wear, significantly reducing roller lifespan. Furthermore, the single guide groove and disordered roller arrangement easily lead to radial runout or axial displacement, causing positioning loss in the device and further reducing the reliability and practicality of the nut-type gearless constant lead planetary roller screw. Utility Model Content

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A nut-type gearless constant lead planetary roller screw includes a base plate, and a guide assembly is provided on the top of the base plate; The guiding assembly includes a guide post fixedly connected to the top of the base plate by a bracket. The inner wall of the guide post is provided with a first guide groove and a second guide groove. A retainer is slidably connected to the outer side of the guide post. Rollers are rotatably connected to the inner wall of the retainer. The rollers are arranged in a staggered 90° pattern. A sliding post is slidably connected to the outer side of the retainer. A third guide groove is provided on the inner wall of the sliding post.

[0006] In a preferred embodiment of the nut-type gearless constant lead planetary roller screw of this utility model, the inner wall of the first guide groove is in rolling connection with the outer side of the roller, and the outer side of the roller is in rolling connection with the inner wall of the third guide groove.

[0007] As a preferred embodiment of the nut-type gearless constant lead planetary roller screw of this utility model, the inner wall of the base plate is provided with a first mounting hole, and a protective disc is fixedly connected to the top of the base plate.

[0008] As a preferred embodiment of the nut-type gearless constant lead planetary roller screw of this utility model, the bottom of the base plate is fixedly connected to a drive motor by a bracket, the output end of the drive motor passes through the inner wall of the base plate through a transmission shaft and is fixedly connected to a screw, and the outer side of the screw is rotatably connected to the inner wall of the protective disc.

[0009] In a preferred embodiment of the nut-type gearless constant lead planetary roller screw of this utility model, the top of the screw is rotatably connected to a limiting plate, and the bottom of the limiting plate is fixedly connected to the top of the guide column.

[0010] As a preferred embodiment of the nut-type gearless constant lead planetary roller screw of this utility model, wherein: a first bearing is rotatably connected to the outer side of the screw, and a planetary carrier is fixedly connected to the outer side of the first bearing.

[0011] As a preferred embodiment of the nut-type gearless constant lead planetary roller screw of this utility model, the inner wall of the planetary carrier is fixedly connected with support columns and support plates, and there are six sets of support columns and support plates arranged at equal intervals.

[0012] In a preferred embodiment of the nut-type gearless constant lead planetary roller screw of this utility model, a second bearing is fixedly connected to the inner wall of the planetary carrier, and a connecting column is fixedly connected to the inner wall of the second bearing.

[0013] As a preferred embodiment of the nut-type gearless constant lead planetary roller screw of this utility model, wherein: the bottom of the connecting column is fixedly connected to a driven column, and the outer side of the driven column is engaged with the outer side of the screw.

[0014] As a preferred embodiment of the nut-type gearless constant lead planetary roller screw of this utility model, the driven column is threaded with a nut on its outer side, the inner wall of the nut is provided with a second mounting hole, and the outer side of the nut is fixedly connected to the sliding column by a bracket.

[0015] In summary, this utility model has the following beneficial effects: by setting a guide component, it can solve the problems of high friction coefficient and rapid wear caused by traditional nut-type lead screws that mostly use sliding friction or single roller guidance. It avoids local stress concentration, prevents failure caused by single-point wear, and has higher reliability. It achieves balanced distribution of multi-directional load, extends the service life of the roller, and provides motion reliability by utilizing the synergistic constraint of double guide grooves. It also has stronger impact resistance and improves the practicality of the overall device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them: Figure 1 A schematic diagram of a preferred embodiment of a nut-type gearless constant lead planetary roller screw provided by this utility model; Figure 2 A schematic diagram of the drive motor and limiting plate structure provided by this utility model; Figure 3 for Figure 2 A magnified structural diagram of point A shown in the figure; Figure 4 A schematic diagram of the first bearing and planetary carrier structure provided by this utility model; Figure 5 A schematic diagram of the sliding column and the third guide groove provided by this utility model.

[0017] In the diagram: 1. Base plate; 2. Guide assembly; 201. Guide post; 202. First guide groove; 203. Second guide groove; 204. Cage; 205. Roller; 206. Sliding post; 207. Third guide groove; 3. First mounting hole; 4. Protective disc; 5. Drive motor; 6. Lead screw; 7. Limiting plate; 8. First bearing; 9. Planetary carrier; 10. Support post; 11. Support plate; 12. Second bearing; 13. Connecting post; 14. Driven post; 15. Nut; 16. Second mounting hole. Detailed Implementation

[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0019] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0020] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0021] Example 1: Reference Figures 1-5 This is the first embodiment of the present invention. This embodiment provides a nut-type gearless constant lead planetary roller screw, including a base plate 1, and a guide assembly 2 is provided on the top of the base plate 1.

[0022] The base plate 1 serves as the foundation support platform for the entire device, ensuring structural stability.

[0023] The guide assembly 2 includes a guide post 201 fixedly connected to the top of the base plate 1 by a bracket. The inner wall of the guide post 201 is provided with a first guide groove 202 and a second guide groove 203. A retainer 204 is slidably connected to the outer side of the guide post 201. Rollers 205 are rotatably connected to the inner wall of the retainer 204. The rollers 205 are arranged in a staggered 90° pattern. A sliding post 206 is slidably connected to the outer side of the retainer 204. A third guide groove 207 is provided on the inner wall of the sliding post 206.

[0024] The guide post 201, as the core guiding structure, converts rotational motion into linear motion through the rolling engagement of the first guide groove 202 and the roller 205, while simultaneously constraining the movement trajectory of the cage 204. The cage 204 carries the roller 205 and guides its movement. The rollers 205 are arranged at 90° staggered intervals on the inner wall of the cage 204, evenly distributing the load and reducing friction. The sliding-rotational composite motion is achieved through the third guide groove 207 and the sliding post 206. The roller 205, as a rolling element, rolls within the first guide groove 202 and the third guide groove 207, replacing sliding friction with rolling friction, reducing motion resistance, and improving the service life of the rolling element. The second guide groove 203 is opened on the other side of the guide post 201 as a preparatory groove for assembling another set of cages 204 and rollers 205.

[0025] Example 2: This is the second embodiment of the present invention, which is based on the previous embodiment.

[0026] Specifically, the inner wall of the first guide groove 202 is in rolling connection with the outer side of the roller 205, and the outer side of the roller 205 is in rolling connection with the inner wall of the third guide groove 207.

[0027] The first guide groove 202 and the third guide groove 207 cooperate with each other to firmly hold the roller 205 in the inner wall of the first guide groove 202 and the third guide groove 207. Both of them are V-shaped grooves that cooperate with the roller 205 at a 90° angle to achieve rolling and improve the sliding efficiency of the sliding column 206.

[0028] Specifically, the inner wall of the base plate 1 is provided with a first mounting hole 3, and a protective plate 4 is fixedly connected to the top of the base plate 1.

[0029] The first mounting hole 3 is used to fix the base plate 1 on the external equipment to ensure that the position of the entire device is fixed and stable. The base plate 1 is tightly connected to the object being installed by bolts or connectors passing through the first mounting hole 3. The preload of the bolts allows the base plate 1 to withstand various loads without loosening. The protective plate 4 is used to make direct contact with the base plate 1 when the planetary carrier 9 falls, so as to avoid the impact of the falling force on the planetary carrier 9.

[0030] Specifically, a drive motor 5 is fixedly connected to the bottom of the base plate 1 via a bracket. The output end of the drive motor 5 passes through the inner wall of the base plate 1 via a transmission shaft and is fixedly connected to a threaded rod 6. The outer side of the threaded rod 6 is rotatably connected to the inner wall of the protective disc 4.

[0031] The drive motor 5 serves as the power source for the entire device, providing power for the rotation of the lead screw 6, thereby driving the movement of the entire device. The lead screw 6 serves as the core transmission component, converting the rotational motion of the drive motor 5 into linear motion or achieving force transmission and motion conversion through meshing with the driven column 14.

[0032] Specifically, the top of the threaded column 6 is rotatably connected to the limiting plate 7, and the bottom of the limiting plate 7 is fixedly connected to the top of the guide column 201.

[0033] The limiting plate 7 restricts axial movement to prevent the driven column 14, planetary carrier 9 and nut 15 from rotating excessively and going out of the end of the threaded column 6, thus ensuring their normal operation.

[0034] Specifically, a first bearing 8 is rotatably connected to the outer side of the screw 6, and a planetary carrier 9 is fixedly connected to the outer side of the first bearing 8.

[0035] The first bearing 8 bears the radial load of the planetary carrier 9, ensuring its rotational stability. By utilizing the rolling motion of the rolling elements inside the bearing between the inner and outer rings, the sliding friction between the lead screw 6 and the planetary carrier 9 is transformed into rolling friction, thereby greatly reducing friction and improving transmission efficiency. At the same time, the bearing's structural design can withstand a certain radial force, ensuring that the planetary carrier 9 can still rotate normally under load. As an important component of the planetary transmission, the planetary carrier 9 provides mounting positions for the support column 10, support plate 11, second bearing 12, and driven column 14.

[0036] Example 3: This is the third embodiment of the present invention, which is based on the first two embodiments.

[0037] Specifically, the inner wall of the planetary carrier 9 is fixedly connected with support columns 10 and support plates 11, and there are six sets of support columns 10 and support plates 11 arranged at equal intervals.

[0038] The support column 10 and support plate 11 enhance the structural strength and stability of the planetary carrier 9, provide installation support for other components, and ensure that the planetary carrier 9 does not deform or get damaged during load and movement.

[0039] Specifically, a second bearing 12 is fixedly connected to the inner wall of the planetary carrier 9, and a connecting column 13 is fixedly connected to the inner wall of the second bearing 12.

[0040] The second bearing 12 supports the connecting column 13, reduces the frictional resistance of the connecting column 13 during rotation, ensures the smooth rotation of the connecting column 13, and bears the radial load of the connecting column 13. Similar to the first bearing 8, it uses the rolling motion of the rolling elements between the inner and outer rings to transform the sliding friction between the connecting column 13 and the planetary carrier 9 into rolling friction, reducing frictional force, improving transmission efficiency, and bearing the radial force of the connecting column 13 to ensure its normal rotation. The connecting column 13 connects the second bearing 12 and the driven column 14, and connects the driven column 14 and the planetary carrier 9 through the second bearing 12. When the driven column 14 rotates around the screw 6, it can drive the planetary carrier 9 to rotate around the screw 6. It should be noted that the second bearing 12 and the first bearing 8 should be tapered rolling element bearings or angular contact ball bearings, both of which can bear the radial and axial loads of the planetary carrier 9 and the driven column 14, improving the overall operational stability.

[0041] Specifically, a driven post 14 is fixedly connected to the bottom of the connecting post 13, and the outer side of the driven post 14 is engaged with the outer side of the threaded post 6.

[0042] The driven pin 14, as the driven component of the planetary transmission, meshes with the lead pin 6. Driven by the lead pin 6, it rotates and revolves. At the same time, it transmits motion to the nut 15 through a threaded connection, achieving linear motion output. The threads on the outer surface of the driven pin 14 mesh with the threads of the lead pin 6. When the lead pin 6 rotates, the driven pin 14 begins to rotate under the action of friction and the threaded pair. Simultaneously, the driven pin 14 revolves around the lead pin 6, thus realizing a complex planetary transmission. The rotational motion of the driven pin 14 is transmitted to the nut 15 through the threaded connection, causing the nut 15 to produce linear motion.

[0043] Specifically, a nut 15 is threadedly connected to the outer side of the driven column 14, and a second mounting hole 16 is provided on the inner wall of the nut 15. The outer side of the nut 15 is fixedly connected to the sliding column 206 through a bracket.

[0044] As the output component of the device, the nut 15 converts the rotational motion of the driven column 14 into its own linear motion through a threaded connection with the driven column 14. The fixed connection with the sliding column 206 restricts the rotation of the nut 15. The guide component 2 assists in guiding the nut 15. The second mounting hole 16 is used to tightly connect the nut 15 to the working component through bolts or connectors, so that the linear motion of the nut 15 can drive the working component to move together, thereby completing a specific work task.

[0045] In use, the drive motor 5 is started to rotate, causing the lead screw 6 to rotate. When the lead screw 6 rotates, it drives the driven screw 14, which meshes with it, to rotate under the support of the planetary carrier 9. The driven screw 14 rotates on its own axis and revolves around the lead screw 6. It also drives the planetary carrier 9 to rotate on its own axis around the axis of the lead screw 6 through the first bearing 8. The driven screw 14 rises or falls around the axis of the lead screw 6 while rotating on its own axis and revolving around the axis. When the driven screw 14 rotates on its own axis and revolves around the axis, it drives the nut 15, which is threaded to it, to move. The sliding column 206 restricts the movement of the nut. The rotational motion of nut 15 causes nut 15 to only perform linear motion. Because sliding column 206 is slidably connected to cage 204, cage 204 is slidably connected to guide column 201, and nut 15 is fixedly connected to sliding column 206, when nut 15 moves, it will drive sliding column 206 to move accordingly. Since the roller 205 in cage 204 rolls on the inner wall of first guide groove 202 and third guide groove 207, the frictional resistance is reduced, which can assist the linear movement of nut 15 and provide guidance, ensuring the stability of its linear movement.

[0046] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A nut-type gearless constant lead planetary roller screw, comprising a base plate (1), characterized in that: The top of the base plate (1) is provided with a guide component (2); The guide assembly (2) includes a guide post (201) fixedly connected to the top of the base plate (1) by a bracket. The inner wall of the guide post (201) is provided with a first guide groove (202) and a second guide groove (203). A retainer (204) is slidably connected to the outer side of the guide post (201). Rollers (205) are rotatably connected to the inner wall of the retainer (204). The rollers (205) are arranged in a staggered 90° pattern. A sliding post (206) is slidably connected to the outer side of the retainer (204). A third guide groove (207) is provided on the inner wall of the sliding post (206).

2. The nut-type gearless constant lead planetary roller screw as described in claim 1, characterized in that: The inner wall of the first guide groove (202) is in rolling connection with the outer side of the roller (205), and the outer side of the roller (205) is in rolling connection with the inner wall of the third guide groove (207).

3. The nut-type gearless constant lead planetary roller screw as described in claim 1, characterized in that: The inner wall of the base plate (1) is provided with a first mounting hole (3), and a protective plate (4) is fixedly connected to the top of the base plate (1).

4. The nut-type gearless constant lead planetary roller screw as described in claim 1, characterized in that: The bottom of the base plate (1) is fixedly connected to a drive motor (5) by a bracket. The output end of the drive motor (5) passes through the inner wall of the base plate (1) through a transmission shaft and is fixedly connected to a threaded rod (6). The outer side of the threaded rod (6) is rotatably connected to the inner wall of the protective disc (4).

5. A nut-type gearless constant lead planetary roller screw as described in claim 4, characterized in that: The top of the threaded column (6) is rotatably connected to a limiting plate (7), and the bottom of the limiting plate (7) is fixedly connected to the top of the guide column (201).

6. A nut-type gearless constant lead planetary roller screw as described in claim 4, characterized in that: The outer side of the threaded column (6) is rotatably connected to a first bearing (8), and the outer side of the first bearing (8) is fixedly connected to a planetary carrier (9).

7. A nut-type gearless constant lead planetary roller screw as described in claim 6, characterized in that: The inner wall of the planetary carrier (9) is fixedly connected with support columns (10) and support plates (11), and there are six sets of support columns (10) and support plates (11) arranged at equal intervals.

8. A nut-type gearless constant lead planetary roller screw as described in claim 7, characterized in that: The inner wall of the planetary carrier (9) is fixedly connected to a second bearing (12), and the inner wall of the second bearing (12) is fixedly connected to a connecting column (13).

9. A nut-type gearless constant lead planetary roller screw as described in claim 8, characterized in that: The bottom of the connecting post (13) is fixedly connected to a driven post (14), and the outer side of the driven post (14) is engaged with the outer side of the thread post (6).

10. A nut-type gearless constant lead planetary roller screw as described in claim 9, characterized in that: The driven column (14) is threaded with a nut (15) on its outer side. The inner wall of the nut (15) is provided with a second mounting hole (16). The outer side of the nut (15) is fixedly connected to the sliding column (206) through a bracket.

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