Anti-deviation planetary roller screw rod

Abstract

The utility model relates to the technical field of pin roller screw rods, in particular to an anti-deviation planetary pin roller screw rod which mainly comprises a nut body, a pin roller screw rod set is connected to the inner side of the nut body, a middle shaft screw rod is connected to the inner side of the pin roller screw rod set, and an anti-deviation installation assembly comprises a gear disc. A first retaining ring is arranged on one side of the gear disc, a second retaining ring is arranged at one end of the gear disc, the insertion positioning assembly comprises a clamping groove, an insertion block is arranged on the inner side of the clamping groove, and a jacking protruding block is connected to the inner side of the insertion block. According to the anti-deviation planetary roller screw rod, the nut body and the gear disc are integrally connected, the mounting stability of the gear disc is ensured, rotation deviation caused by mounting position deviation is avoided, the first retaining ring and the second retaining ring are arranged on the outer side for guiding, inserting and positioning, the mounting stability is further improved, and the service life of the gear disc is prolonged. And the subsequent use precision and service life of the screw rod are ensured.

Description

Technical Field

[0001] This utility model relates to the field of ball screw technology, specifically to a planetary ball screw with anti-deviation capability. Background Technology

[0002] Planetary roller screws are precision mechanical transmission devices that convert rotary motion into linear motion or vice versa. They are a replacement for ball screws and have higher load capacity, stiffness, and lifespan. They are mainly used in aerospace, military equipment, industrial automation, energy equipment, and medical equipment.

[0003] In existing planetary roller screws, the nut body and gear disc are fixed with screws during use, allowing the nut body and gear disc to mesh and rotate within the internal roller screw body for adjustment. However, during installation, a gap inevitably appears between the nut body and gear disc, increasing the clearance between them and the roller screw body. Furthermore, since there are two gear discs, if the installation positions of the two gear discs are incorrect, it will cause adjustment deviations during subsequent rotation. Additionally, the meshing friction between the screw threads will increase due to reduced thread matching, affecting the screw's accuracy and service life. Therefore, optimization and improvement are necessary. Utility Model Content

[0004] The purpose of this invention is to provide a planetary roller screw that prevents misalignment, thereby solving the problem mentioned in the background art where the nut body and gear disk are installed separately, which easily leads to installation misalignment and affects the subsequent accuracy and service life of the screw.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a planetary roller screw with anti-offset capability, comprising: a nut body, a roller screw assembly connected to the inner side of the nut body, and a central shaft screw connected to the inner side of the roller screw assembly; and further comprising an anti-offset mounting assembly and a plug-in positioning assembly.

[0006] The anti-offset mounting assembly is located inside the nut body. The anti-offset mounting assembly includes a gear disk, a retaining ring one is provided on one side of the gear disk, and a retaining ring two is provided at one end of the gear disk. The anti-offset mounting assembly is used to prevent offset after the lead screw is installed.

[0007] The insertion positioning component is disposed on the inner side of retaining ring one. The insertion positioning component includes a snap-fit ​​groove, and an insertion block is disposed on the inner side of the snap-fit ​​groove. An insertion protrusion is connected to the inner side of the insertion block. The insertion positioning component is used to position retaining ring one.

[0008] Preferably, the retaining ring one is connected to one inner end of the nut body, and the retaining ring two is connected to the other inner end of the nut body.

[0009] Preferably, the inner side of the retaining ring two is provided with a plug hole for insertion into the roller screw assembly.

[0010] Preferably, the gear disk is integrally connected to both inner ends of the nut body, and the inner middle of the nut body is provided with a screw thread that meshes with the roller screw assembly.

[0011] Preferably, the snap-fit ​​groove is located on the inner side of both ends of the nut body.

[0012] Preferably, a retaining ring is connected to the outer side of the retaining ring one, and an annular positioning groove is provided on the inner side of the retaining ring one to engage with the retaining ring.

[0013] Preferably, the plug block is fixedly connected to the inner side of the retaining ring, the inner side of the plug block is slidably connected to an adjusting slider, and the inner side of the adjusting slider is fixedly connected to an elastic pressing member, and the push-in protrusion is fixedly connected to the outer side of the adjusting slider.

[0014] Preferably, the inner side of the plug block is provided with a guide groove that is slidably connected to the adjusting slider, and a buffer washer is fixedly connected to one end of the guide groove.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This utility model integrates the nut body and the gear disk, ensuring the stability of the gear disk installation and avoiding rotational deviation due to installation position offset. The outer side is provided with retaining ring one and retaining ring two for guiding and positioning, further improving the installation stability and ensuring the subsequent accuracy and service life of the lead screw.

[0017] When inserting retaining ring one and retaining ring two, in order to facilitate the fitting and insertion of the insertion hole and the roller screw assembly, an insertion block is set for guiding and alignment. With the help of the movable and adjustable push-in protrusion, after being inserted into the snap-in groove, it pushes and snaps in, improving the stability of the installation, further ensuring that there will be no positional deviation during screw assembly, and thus improving the efficiency of screw use. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a partial cross-sectional three-dimensional structural diagram of the present invention;

[0020] Figure 3 This is a partial cross-sectional three-dimensional structural diagram of the nut body of this utility model;

[0021] Figure 4 This is a three-dimensional structural diagram of the retaining ring and the snap ring of this utility model.

[0022] Figure 5 This is a partial cross-sectional view of the three-dimensional structure of this utility model.

[0023] In the diagram: 1. Nut body; 2. Roller screw assembly; 3. Central shaft screw; 4. Retaining ring one; 5. Retaining ring two; 6. Insertion hole; 7. Snap-fit ​​groove; 8. Gear disc; 9. Screw thread; 10. Annular positioning groove; 11. Snap ring; 12. Insertion block; 13. Guide groove; 14. Adjusting slider; 15. Elastic pressing component; 16. Push-in protrusion; 17. Buffer washer. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0026] like Figure 1 - Figure 5 As shown, this application provides a planetary roller screw for preventing offset, including: a nut body 1, a roller screw assembly 2 connected to the inner side of the nut body 1, and a central shaft screw 3 connected to the inner side of the roller screw assembly 2.

[0027] An anti-offset mounting assembly is provided on the inner side of the nut body 1. The anti-offset mounting assembly includes a gear disk 8, a retaining ring 4 on one side of the gear disk 8, and a retaining ring 5 on one end of the gear disk 8. The anti-offset mounting assembly is used to prevent offset after the lead screw is installed.

[0028] Specifically, such as Figure 2 As shown, retaining ring 4 is connected to one end of the inner side of the nut body 1, and retaining ring 5 is connected to the other end of the inner side of the nut body 1. The internal structures of retaining ring 4 and retaining ring 5 are the same, and they are used to seal the two sides of the nut body 1 respectively.

[0029] Specifically, such as Figure 2 As shown, the inner side of retaining ring 2 5 is provided with insertion holes 6 for connecting to the roller screw assembly 2. The number of insertion holes 6 is the same as that of roller screw assembly 2, to ensure that retaining ring 2 5 limits the position of roller screw assembly 2 after installation.

[0030] Specifically, such as Figure 3As shown, the gear disk 8 is integrally connected to both ends of the inner side of the nut body 1, and the inner middle of the nut body 1 is provided with a screw thread 9 that meshes with the roller screw assembly 2. By integrally setting the gear disks 8 on both sides inside the nut body 1, stability is ensured, and the gear rings of the gear disks 8 on both sides are kept in the same position, thus improving the smoothness of the rotation of the roller screw assembly 2.

[0031] Specifically, such as Figure 3 As shown, the snap-fit ​​groove 7 is provided on the inner side of both ends of the nut body 1. There are two snap-fit ​​grooves 7, located on the inner sides of the nut body 1. The size of the snap-fit ​​groove 7 is adapted to retaining ring 1 4 and retaining ring 2 5. The inner side of the snap-fit ​​groove 7 is also provided with a slot that matches the plug block 12, which facilitates positioning after plugging.

[0032] Specifically, such as Figure 4 As shown, a retaining ring 4 is connected to a retaining spring 11 on its outer side, and an annular positioning groove 10 is provided on the inner side of the retaining ring 4 to engage with the retaining spring 11. By providing an annular positioning groove 10 that matches the retaining spring 11, the position of the retaining spring 11 will not shift when it is pressed against the middle of the retaining ring 4 and the nut body 1.

[0033] A plug-in positioning component is provided on the inner side of retaining ring 4. The plug-in positioning component includes a snap-fit ​​groove 7. A plug-in block 12 is provided on the inner side of the snap-fit ​​groove 7. A push-in protrusion 16 is connected to the inner side of the plug-in block 12. The plug-in positioning component is used to maintain the positioning of retaining ring 4.

[0034] Specifically, such as Figure 5 As shown, the plug-in block 12 is fixedly connected to the inner side of the retaining ring 4. The inner side of the plug-in block 12 is slidably connected to the adjusting slider 14, and the inner side of the adjusting slider 14 is fixedly connected to the elastic pressing member 15. The two ends of the elastic pressing member 15 are respectively fixedly connected to the inner side of the adjusting slider 14 and the inner side of the guide groove 13, providing buffer protection for the movement of the adjusting slider 14. The push-in protrusion 16 is fixedly connected to the outer side of the adjusting slider 14. After being pushed out, the push-in protrusion 16 can be inserted into the slot inside the snap-fit ​​groove 7 for positioning, improving the stability of positioning.

[0035] Specifically, such as Figure 5 As shown, the inner side of the plug block 12 is provided with a guide groove 13 that is slidably connected to the adjusting slider 14, and a buffer washer 17 is fixedly connected to one end of the guide groove 13. The buffer washer 17 is located at the contact part between the adjusting slider 14 and the end of the guide groove 13, which further improves the buffer protection when the adjusting slider 14 moves.

[0036] In this embodiment: the nut body 1 and the gear disk 8 are integrated to ensure the stability of the gear disk 8 installation and avoid rotational deviation due to installation position offset. The outer side is provided with retaining ring 1 4 and retaining ring 2 5 for guiding insertion and positioning. When the retaining ring 1 4 and retaining ring 2 5 are inserted, in order to facilitate the fitting and insertion of the insertion hole 6 and the roller screw assembly 2, the insertion block 12 is provided for guiding alignment. With the cooperation of the movable and adjustable push-in protrusion 16, after being inserted into the snap-in groove 7, it pushes and snaps, further ensuring that there will be no positional offset during screw assembly.

[0037] The specific steps of this solution are as follows: When installing the planetary roller screw, first insert the retaining ring 4 into the front end of the gear disk 8 at one end of the inner side of the nut body 1. During insertion, the retaining ring 4 is engaged in the slot inside the engagement groove 7 by the insertion block 12. Then, the retaining ring 4 is secured in the appropriate engagement groove 7. After the insertion block 12 is engaged, the elastic force of the elastic pressing member 15 drives the pressed push-in protrusion 16 outwards for engagement and positioning, ensuring that the position of the retaining ring 4 does not shift after installation. Then, insert the snap ring 11 into the annular positioning groove 10 inside the retaining ring 4 for locking. Then, insert the roller screw assembly 2 from the other end of the nut body 1. The roller screw assembly 2 cooperates with the gear disk 8 and the screw thread 9. Then, install the retaining ring 2 5 and another snap ring 11 on the other side of the nut body 1. The installation method is the same as that of the retaining ring 4. The end of the roller screw assembly 2 passes through the insertion hole 6 for limiting and locking. Finally, insert the central shaft screw 3 into the inner side of the roller screw assembly 2.

[0038] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary; within the framework of this invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of this invention as described above, which are not provided in the details for the sake of brevity.

[0039] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A misalignment-proof planetary roller screw, comprising: A nut body (1), wherein a roller screw assembly (2) is connected to the inner side of the nut body (1), and a central shaft screw (3) is connected to the inner side of the roller screw assembly (2), characterized in that it further includes: Anti-offset mounting assembly, the anti-offset mounting assembly is disposed on the inner side of the nut body (1), the anti-offset mounting assembly includes a gear disk (8), a retaining ring one (4) is provided on one side of the gear disk (8), and a retaining ring two (5) is provided at one end of the gear disk (8), the anti-offset mounting assembly is used to prevent offset after the lead screw is installed; The insertion positioning component is disposed inside the retaining ring (4). The insertion positioning component includes a snap-fit ​​groove (7). A snap-fit ​​block (12) is disposed inside the snap-fit ​​groove (7). A push-in protrusion (16) is connected to the inside of the snap-fit ​​block (12). The insertion positioning component is used to position the retaining ring (4).

2. The anti-derailment planetary roller screw of claim 1, wherein, The retaining ring one (4) is connected to one end of the inner side of the nut body (1), and the retaining ring two (5) is connected to the other end of the inner side of the nut body (1).

3. The anti-derailment planetary roller screw of claim 2, wherein, The inner side of the retaining ring 2 (5) is provided with a plug hole (6) for plugging into the roller screw assembly (2).

4. The anti-derailment planetary roller screw of claim 1, wherein, The gear disk (8) is integrally connected to both ends of the inner side of the nut body (1), and the inner middle of the nut body (1) is provided with a screw thread (9) that meshes with the roller screw assembly (2).

5. The planetary roller screw for preventing offset according to claim 1, characterized in that, The snap-fit ​​groove (7) is provided on the inner side of both ends of the nut body (1).

6. The planetary roller screw for preventing offset according to claim 2, characterized in that, The outer side of the retaining ring (4) is connected to a retaining ring (11), and the inner side of the retaining ring (4) is provided with an annular positioning groove (10) that engages with the retaining ring (11).

7. The planetary roller screw for preventing offset according to claim 2, characterized in that, The plug-in block (12) is fixedly connected to the inner side of the retaining ring (4). An adjusting slider (14) is slidably connected to the inner side of the plug-in block (12), and an elastic extrusion member (15) is fixedly connected to the inner side of the adjusting slider (14). The push-in protrusion (16) is fixedly connected to the outer side of the adjusting slider (14).

8. The planetary roller screw for preventing offset according to claim 7, characterized in that, The inner side of the plug block (12) is provided with a guide groove (13) that is slidably connected to the adjusting slider (14), and a buffer washer (17) is fixedly connected to one end of the guide groove (13).

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