Planetary roller screw mechanism

Abstract

The invention particularly relates to a planetary roller screw mechanism which comprises a moving assembly, a nut assembly and a driving assembly, and the moving assembly comprises a moving part capable of moving in the first direction. The nut assembly comprises a first nut, a push rod and a first support assembly, the first nut extends in the second direction, the second direction is perpendicular to the first direction, the first nut is rotatably arranged on the moving part, a first outer tooth thread sleeve is arranged at one end of the push rod, and the first outer tooth thread sleeve is sleeved with the first support assembly. And the inner wall of the first nut is meshed with the first outer tooth thread bushing. The driving assembly comprises a transmission part which moves in the first direction, the transmission part and the moving part move at the same speed, and the transmission part is connected with the first nut in an engaged mode. According to the planetary roller lead screw mechanism, the moving piece of the moving assembly and the transmission piece of the driving assembly move at the same speed and are matched with the nut assembly, so that the problem that an existing planetary roller lead screw mechanism is single in use mode can be solved.

Description

Technical Field

[0001] This invention relates to the field of lead screw technology, and specifically to a planetary roller lead screw mechanism. Background Technology

[0002] A lead screw is a mechanical device that can convert rotary motion into linear motion. There are two main types of commonly used high-efficiency lead screws: roller lead screws and planetary roller lead screws. The latter has two types: standard and reverse. A standard planetary roller lead screw has a long lead screw and a short nut structure, with no axial relative motion between the rollers and the nut. A reverse planetary roller lead screw has a short lead screw and a long nut structure, with no axial relative motion between the rollers and the lead screw. Because planetary roller lead screws use threaded rollers instead of traditional rollers as the force transmission unit, their force transmission unit has a larger contact radius and more contact points compared to traditional roller lead screws. Therefore, their rated load, stiffness, speed, and lifespan are all improved. However, existing planetary roller lead screws have limited application methods and cannot be used in complex working environments. Summary of the Invention

[0003] The purpose of this invention is to at least solve the problem of the limited application methods of existing planetary roller screw mechanisms. This purpose is achieved through the following technical solution: The first aspect of this invention provides a planetary roller screw mechanism, comprising: A movable component, the movable component including a movable element configured to be movable along a first direction; A nut assembly, comprising a first nut, a push rod, and a first bracket assembly, wherein the first nut extends along a second direction perpendicular to the first direction, the first nut is rotatably mounted on the movable member, one end of the push rod is provided with a first external toothed thread sleeve, and the first bracket assembly is fitted onto the outside of the first external toothed thread sleeve and engages with the inner wall of the first nut and the first external toothed thread sleeve; A drive assembly, the drive assembly including a transmission member, the transmission member being movable along the first direction and moving at the same speed as the moving member, the transmission member being engaged with the first nut.

[0004] The planetary roller screw mechanism of the present invention includes a moving component, a nut component, and a driving component. By moving the moving part of the moving component and the transmission part of the driving component at the same speed, and by setting the nut component as a cooperating structure of the first nut, push rod, and first support component, the planetary roller screw mechanism can achieve multi-directional control of the movement of the components, which helps to solve the problem of the single use mode of the existing planetary roller screw mechanism.

[0005] In addition, the planetary roller screw mechanism according to the present invention may also have the following additional technical features: In some embodiments of the present invention, the first support assembly includes two first planetary carriers and a plurality of first rollers. The two first planetary carriers are respectively disposed on both sides of the first rollers. The outer wall of the first rollers is provided with threads, and the threads engage with the inner wall of the first nut and the outer wall of the first external toothed threaded sleeve.

[0006] In some embodiments of the present invention, the nut assembly further includes a first pressing member, which is detachably disposed at one end of the push rod. The push rod is provided with a first limiting member, and the first bracket assembly is clamped between the first pressing member and the first limiting member.

[0007] In some embodiments of the present invention, the transmission element is configured as a lead screw structure, and the drive assembly includes: The second nut extends along the first direction and is rotatable; The second support assembly is sleeved on one end of the transmission member, and the second support assembly engages with the interior of the second nut and the outer wall of the transmission member.

[0008] In some embodiments of the present invention, a second external toothed threaded sleeve is provided at one end of the transmission member; The second support assembly includes two second planetary carriers and a plurality of second rollers. The two second planetary carriers are respectively disposed on both sides of the second rollers. The outer wall of the second rollers is provided with external threads, and the external threads mesh with the inner wall of the transmission member and the outer wall of the second external toothed sleeve.

[0009] In some embodiments of the present invention, the driving assembly further includes a driving motor, the driving motor being connected to the second nut, and the output shaft of the driving motor being coaxially arranged with the second nut; And / or, the drive assembly further includes a drive motor, the output shaft of the drive motor is provided with a first engagement portion, the outer wall of the second nut is provided with a second engagement portion, and the first engagement portion engages with the second engagement portion.

[0010] In some embodiments of the present invention, the transmission element is configured as a nut structure, and the drive assembly further includes: Drive motor; A first lead screw, one end of which is connected to the output shaft of the drive motor, and the transmission component is mounted on the first lead screw; The third support assembly is disposed inside the transmission component and meshes with the inner wall of the transmission component and the outer wall of the first lead screw; Mounting sleeves are disposed on the transmission component. There are two mounting sleeves, which are respectively disposed at opposite ends of the third support assembly and restrict the axial movement of the third support assembly.

[0011] In some embodiments of the present invention, the third support assembly includes two third planetary carriers and a plurality of third rollers. The two third planetary carriers are respectively disposed on opposite sides of the third rollers. The outer wall of the third rollers is provided with external threads, which mesh with the internal threads of the transmission member and the external threads of the first lead screw.

[0012] In some embodiments of the present invention, the moving component includes a slide rail extending along the first direction, and the moving member is movably disposed on the slide rail.

[0013] In some embodiments of the present invention, one end of the transmission member is provided with a first helical gear, and the planetary roller screw mechanism further includes a second helical gear, which is disposed on the first nut and meshes with the first helical gear. Attached Figure Description

[0014] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of one structure of the planetary roller screw mechanism shown in an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the planetary roller screw mechanism shown from another perspective; Figure 3 for Figure 2 The diagram shows a cross-sectional view of the planetary roller screw mechanism along the AA direction. Figure 4 for Figure 3 A magnified schematic diagram of a local structure of B shown; Figure 5 for Figure 3 A magnified schematic diagram of a portion of the structure of C shown; Figure 6 for Figure 3 A magnified schematic diagram of a portion of the structure of D is shown; Figure 7 This is a schematic diagram of another structure of the planetary roller screw mechanism shown in the embodiment of the present invention; Figure 8 for Figure 7A schematic diagram of the planetary roller screw mechanism shown from another perspective; Figure 9 for Figure 8 The diagram shows a cross-sectional view of the planetary roller screw mechanism in the EE direction. Figure 10 This is a schematic diagram of a third structure of the driving component shown in an embodiment of the present invention; Figure 11 This is a schematic diagram of the third structure of the planetary roller screw mechanism shown in the embodiment of the present invention.

[0015] The markings in the attached diagram are as follows: 100. Planetary roller screw mechanism; 10. Mobile components; 11. Moving part; 12. Slider; 13. First bearing; 14. Slide rail; 20. Nut assembly; 21. First nut; 22. Push rod; 221. First external threaded sleeve; 222. First limiting member; 23. First support assembly; 231. First planetary carrier; 232. First roller; 24. First pressing member; 25. First elastic retaining ring; 30. First helical gear; 40. Driver components; 41. Transmission component; 411. Second external threaded sleeve; 412. Second limiting component; 42. Second nut; 421. Second meshing part; 43. Second support assembly; 431. Second planetary carrier; 432. Second roller; 44. Second pressing component; 45. Second elastic retaining ring; 46. Third support assembly; 461. Third planetary carrier; 462. Third roller; 47. First lead screw; 48. Drive motor; 481. Output shaft; 482. First meshing part; 49. Mounting sleeve; 50. Second helical gear; 60. Connectors; 70. Linkage components; 71. Second lead screw; 72. Third nut; 73. Fourth support assembly; 74. Second bearing; 80. Adjusting components. Detailed Implementation

[0016] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0017] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also mean including the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0018] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0019] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations.

[0020] A lead screw is a mechanical device that can convert rotary motion into linear motion. There are two main types of commonly used high-efficiency lead screws: roller lead screws and planetary roller lead screws. The latter mainly consists of a lead screw, rollers, and a nut. Because it uses threaded rollers instead of rollers as the force transmission unit, its force transmission unit has a larger contact radius and more contact points compared to roller lead screws. Therefore, its rated load, stiffness, speed, and service life are all improved. However, the existing planetary roller lead screws have a limited range of applications and cannot be used in complex working environments.

[0021] To solve the above problems, such as Figures 1-5 As shown, the present invention proposes a planetary roller screw mechanism 100, which includes a moving component 10, a nut assembly 20, and a drive assembly 40. The moving component 10 includes a moving member 11, which is movable along a first direction x. The nut assembly 20 includes a first nut 21, a push rod 22, and a first support assembly 23. The first nut 21 extends along a second direction y, which is perpendicular to the first direction x. The first nut 21 is rotatably mounted on the moving member 11. One end of the push rod 22 is provided with a first external threaded sleeve 221. The first support assembly 23 is fitted onto the outside of the first external threaded sleeve 221 and meshes with the inner wall of the first nut 21 and the first external threaded sleeve 221. The drive assembly 40 includes a transmission member 41, which is movable along the first direction x and moves at the same speed as the moving member 11. The transmission member 41 is meshed with the first nut 21.

[0022] Specifically, by moving the moving part 11 of the moving component 10 and the transmission part 41 of the driving component 40 at the same speed, and by setting the nut assembly 20 as a cooperating structure of the first nut 21, the push rod 22 and the first support assembly 23, the planetary roller screw mechanism 100 can achieve multi-directional control of the movement of the object, which helps to solve the problem of the single use mode of the existing planetary roller screw mechanism 100.

[0023] It is necessary to understand that, such as Figure 1As shown, the planetary roller screw mechanism 100 includes a moving component 10, a nut assembly 20, and a drive assembly 40. The moving component 10 includes a moving member 11, which can move along a first direction x at a preset speed. The drive component 40 also has a drive member that can move along the first direction x at a preset speed. The moving member 11 and the drive member are connected by the nut assembly 20, which is positioned along a second direction y, and intersects the first direction x. Optionally, the second direction y is perpendicular to the first direction x. In this embodiment, one end of the nut assembly 20 is connected to the drive member. The drive member acts on the nut assembly 20 to cause an item on the moving member 11 to move along both the first direction x and the second direction y simultaneously, thereby achieving multi-directional movement of the item and improving the existing use of planetary roller screws, making them suitable for complex working environments.

[0024] like Figures 1-4 As shown, the moving component 10 includes a slide rail 14, a slider 12, and a moving member 11. The slide rail 14 extends along a first direction x, and the moving member 11 is connected to the slide rail 14 via the slider 12 to enable movement of the moving member 11 along the first direction x. In this embodiment, there are two slide rails 14, and the two slide rails 14 are spaced apart along a third direction. Each slide rail 14 is provided with at least one slider 12, and all sliders 12 are connected via the moving member 11. The third direction is perpendicular to the first direction x and perpendicular to the second direction y, which is not shown in the figure. Optionally, the second direction y is a vertical direction, and both the third direction and the first direction x are located in the horizontal plane.

[0025] It should be noted that the moving component 10 can be configured as two linear motors, which are connected by the moving part 11 and can move along the first direction x. The structure is simple, the product is mature, and it can be purchased and used directly. Optionally, the moving part 11 can be configured as a plate structure, and the connection method can be screwed, snap-fitted, welded, etc.

[0026] In addition, the moving component 10 also includes a support plate, which is not shown in the figure. The support plate is connected to the moving component 11 through a guide structure. For example, a sleeve is provided on the support plate, and a positioning post is provided on the moving component 11. The sleeve is adapted to be fitted onto the positioning post. With this configuration, when the moving component 11 moves along the first direction x, the support plate and the item on the support plate move along the first direction x. At the same time, the support plate is connected to the end of the push rod 22 away from the first external threaded sleeve 221 through a bearing. At this time, when the push rod 22 moves along the second direction y due to the rotation of the first nut 21, the support plate can move along the second direction y under the push of the push rod 22. At this time, the item can move in a straight line or along a curve, thereby realizing the diverse movement of the item and helping to improve the usage of the planetary roller screw mechanism 100.

[0027] It should be further understood that the nut assembly 20 includes a first nut 21, a push rod 22, and a first support assembly 23. The first nut 21 extends along the second direction y and is mounted on the movable member 11 via a first bearing 13, allowing the first nut 21 to be rotatably mounted on the movable member 11. One end of the push rod 22 is provided with a first external threaded sleeve 221, and the other end of the push rod 22 is used to drive an item on the movable member 11 to move along the second direction y. The first support assembly 23 is fitted onto the outside of the first external threaded sleeve 221 and meshes with the inner walls of the first external threaded sleeve 221 and the first nut 21 to form a planetary roller screw structure. With this configuration, when the drive member drives the first nut 21 to rotate, the push rod 22 can move along the second direction y under the transmission of the first support assembly 23.

[0028] like Figure 3 and Figure 5 As shown, the first support assembly 23 is mounted on the push rod 22. Specifically, the first support assembly 23 includes two first planetary carriers 231 and multiple first rollers 232. The two first planetary carriers 231 are respectively disposed on both sides of the first rollers 232. The outer wall of the first rollers 232 is threaded, and the threads mesh with the inner wall of the first nut 21 and the outer wall of the first external threaded sleeve 221. This arrangement, in conjunction with the first nut 21 and the push rod 22, forms a reversible planetary roller screw structure, thereby ensuring the movement effect of the push rod 22.

[0029] In this embodiment, a first limiting member 222 is provided on the push rod 22. The first limiting member 222 has a plate-like structure and is integrally formed with the push rod 22. The first limiting member 222 is located on one side of the first external threaded sleeve 221. Meanwhile, the nut assembly 20 also includes a first pressing member 24 and a first elastic retaining ring 25. The first pressing member 24 is detachably disposed at one end of the push rod 22. The first pressing member 24 is screwed to the push rod 22 and is located on the other side of the first external threaded sleeve 221. The first pressing member 24 has a pressing structure that presses against the first support assembly 23, so that the first support assembly 23 is clamped between the first pressing member 24 and the first limiting member 222. Optionally, there are two first elastic retaining rings 25, one of which is disposed between the first limiting member 222 and the first support assembly 23, and the other is disposed between the first pressing member 24 and the first support assembly 23. With this configuration, the first limiting member 222 and the first pressing member 24 cooperate to restrict the first support assembly 23, so as to prevent the first support assembly 23 from moving axially along the push rod 22.

[0030] It should be further understood that the drive assembly 40 includes a transmission member 41, which is movable along a first direction x, and a first helical gear 30 is provided at one end of the transmission member 41. Simultaneously, the planetary roller screw mechanism 100 also includes a second helical gear 50, which is disposed on the first nut 21 and meshes with the first helical gear 30. Optionally, the transmission member 41 and the first helical gear 30 are integrally formed, while the second helical gear 50 is detachably disposed on the first nut 21. In this embodiment, the second helical gear 50 is fixed to one end of the first nut 21 by a flange structure.

[0031] Furthermore, the transmission member 41 is configured as a lead screw structure, and the drive assembly 40 includes a second nut 42 and a second support assembly 43, wherein the second nut 42 extends along a first direction x and is rotatably disposed. The second support assembly 43 is sleeved on one end of the transmission member 41, and the second support assembly 43 engages with the interior of the second nut 42 and the outer wall of the transmission member 41.

[0032] Specifically, by setting the transmission component 41 as a lead screw structure, and cooperating with the second nut 42 and the second support assembly 43, the drive assembly 40 can be set as a planetary roller lead screw structure, and then cooperated with the nut assembly 20, which can effectively ensure the movement accuracy of the moving component 11 and the cooperation stability between the transmission component 41 and the second nut 42, thereby improving the performance of the planetary roller lead screw mechanism 100.

[0033] It is necessary to understand that, such as Figures 1 to 9 As shown, the transmission component 41 is a lead screw, with a first helical gear 30 at one end and a second external toothed threaded sleeve 411 at the other end. Simultaneously, a second nut 42 is fitted onto the transmission component 41 and connected to the second external toothed threaded sleeve 411 of the transmission component 41 via a second support assembly 43. Optionally, the second support assembly 43 has the same or similar structure as the first support assembly 23. In this embodiment, the second support assembly 43 includes two second planetary carriers 431 and multiple second rollers 432. The two second planetary carriers 431 are respectively disposed on both sides of the second rollers 432. The outer wall of the second rollers 432 is provided with external threads, which mesh with the inner wall of the transmission component 41 and the outer wall of the second external toothed threaded sleeve 411.

[0034] like Figure 6As shown, the transmission component 41 is provided with a second limiting member 412, which is located on one side of the first external threaded sleeve 221. Simultaneously, the drive assembly 40 also includes a second pressing member 44 and a second elastic retaining ring 45. The second pressing member 44 is detachably disposed at one end of the transmission component 41 and cooperates with the second limiting member 412 to clamp the second support assembly 43, thereby restricting the second support assembly 43 and preventing it from moving axially along the push rod 22. The second elastic retaining ring 45 is disposed between the second pressing member 44 and the second support assembly 43, and also between the second limiting member 412 and the second support assembly 43.

[0035] In this embodiment, such as Figures 1-3 As shown, the drive assembly 40 also includes a drive motor 48, which is connected to the second nut 42, and the output shaft 481 of the drive motor 48 is coaxially arranged with the second nut 42. Specifically, the drive motor 48 has an output shaft 481, on which a connector 60 is provided. The connector 60 is connected to the second nut 42 through a flange structure, so that the axis of the output shaft 481 and the axis of the second nut 42 are on the same straight line. At this time, the drive motor 48 drives the rotation of the second nut 42, and thereby drives the transmission component 41 to move along the first direction x. This arrangement is simple in structure, easy to install, and has good stability.

[0036] In other embodiments of this application, such as Figures 7-9 As shown, the drive assembly 40 also includes a drive motor 48. The output shaft 481 of the drive motor 48 is provided with a first engaging portion 482, and the outer wall of the second nut 42 is provided with a second engaging portion 421. The first engaging portion 482 meshes with the second engaging portion 421. The arrangement of the first engaging portion 482 and the second engaging portion 421 enables the drive motor 48 to drive the rotation of the second nut 42. Moreover, the first engaging portion 482 is a gear structure, and the first engaging portion 482 is detachably connected to the output shaft 481 of the drive motor 48. The connection method is simple, and the first engaging portion 482 is replaceable, thereby adjusting the rotation speed of the second nut 42, and consequently adjusting the moving speed and rotation speed of the transmission component 41, so as to adjust the moving speed of the push rod 22 in the nut assembly 20. The structure is simple and the control accuracy is high.

[0037] In other embodiments of this application, such as Figure 10As shown, the transmission component 41 is configured as a nut structure, and the aforementioned first helical gear 30 is disposed on the outer wall of the transmission component 41. In this case, the drive assembly 40 also includes a drive motor 48, a first lead screw 47, a third bracket assembly 46, and a mounting sleeve 49. One end of the first lead screw 47 is connected to the output shaft 481 of the drive motor 48. Optionally, the first lead screw 47 is connected to the output shaft 481 by screwing or welding. Simultaneously, the transmission component 41 is mounted on the first lead screw 47, and the third bracket assembly 46 is disposed inside the transmission component 41 and meshes with the inner wall of the transmission component 41 and the outer wall of the first lead screw 47.

[0038] Still Figure 10 As shown, two mounting sleeves 49 are disposed inside the transmission component 41, and the two mounting sleeves 49 are respectively disposed at opposite ends of the third support assembly 46, restricting the axial movement of the third support assembly 46. This arrangement fixes the third support assembly 46 to the transmission component 41 and connects it to the first lead screw 47, thereby driving the transmission component 41 to rotate and move along the first direction x when the first lead screw 47 rotates. This design is simple, provides high control precision, and helps ensure the connection effect between the transmission component 41 and the first nut 21.

[0039] Specifically, the third support assembly 46 includes two third planetary carriers 461 and multiple third rollers 462. The two third planetary carriers 461 are respectively disposed on opposite sides of the third rollers 462. The outer wall of the third rollers 462 is provided with external threads, which mesh with the internal threads of the transmission component 41 and the external threads of the first lead screw 47. At this time, the aforementioned mounting sleeves 49 are respectively disposed at both ends of the transmission component 41 and fixed to the transmission component 41 by pins. Meanwhile, the third planetary carriers 461 are disposed on the mounting sleeves 49 and fixedly connected to the mounting sleeves 49. Multiple third balls are disposed between the two third planetary carriers 461, and each third ball meshes with the internal threads of the transmission component 41 and the external threads of the first lead screw 47, thereby ensuring transmission efficiency.

[0040] In addition, such as Figure 11 As shown, the planetary roller screw mechanism 100 also includes a linkage assembly 70, which includes a second screw 71, a third nut 72, and a fourth support assembly 73. The third nut 72 is connected to the output shaft 481 of the drive motor 48, and is fitted onto one end of the second screw 71, and is also connected to the second screw 71 via the fourth support assembly 73. Specifically, the structure of the linkage assembly 70 is the same as that of the nut assembly 20, except that the fourth support assembly 73 includes a planetary carrier and ball bearings, and is mounted on the second screw 71. When the output shaft 481 rotates, it simultaneously drives the third nut 72 and the second nut 72 to rotate, thereby causing the transmission component 41 and the second screw 71 to move synchronously along the first direction x.

[0041] It should be noted that the linkage assembly 70 also includes a second bearing 74, which is located at one end of the second lead screw. The fourth bracket assembly 73 is located at the other end of the second lead screw 71, and the second bearing 74 is located on the transmission member 41. When the second lead screw 71 moves along the first direction x, the second lead screw 71 can use the structure of the second bearing 74 to push the transmission member 41 to move along the first direction x. At this time, the moving assembly 10 can be equipped with the aforementioned slide rail 14 to ensure the stability and sliding effect of the moving member 11. Alternatively, a guide post can be provided, and a structure in which the guide post passes through the moving member 11 can be adopted to ensure the movement of the moving member 11. This application does not impose any restrictions on this.

[0042] In addition, as Figure 11 As shown, the output shaft 481 of the drive motor 48 is connected to the third nut 72 via an adjusting member 80. Optionally, the outer wall of the third nut 72 is provided with a meshing structure, and the adjusting member 80 meshes with the meshing structure and the first meshing part 482 on the output shaft 481. This arrangement helps to improve the applicability of the linkage assembly 70, thereby improving the applicability of the planetary roller screw mechanism 100.

[0043] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A planetary roller screw mechanism, characterized in that, include: A movable component, the movable component including a movable element configured to be movable along a first direction; A nut assembly, comprising a first nut, a push rod, and a first bracket assembly, wherein the first nut extends along a second direction perpendicular to the first direction, the first nut is rotatably mounted on the movable member, one end of the push rod is provided with a first external toothed thread sleeve, and the first bracket assembly is fitted onto the outside of the first external toothed thread sleeve and engages with the inner wall of the first nut and the first external toothed thread sleeve; A drive assembly, the drive assembly including a transmission member, the transmission member being movable along the first direction and moving at the same speed as the moving member, the transmission member being engaged with the first nut.

2. The planetary roller screw mechanism according to claim 1, characterized in that, The first support assembly includes two first planetary carriers and a plurality of first rollers. The two first planetary carriers are respectively disposed on both sides of the first rollers. The outer wall of the first rollers is provided with threads, and the threads engage with the inner wall of the first nut and the outer wall of the first external toothed threaded sleeve.

3. The planetary roller screw mechanism according to claim 2, characterized in that, The nut assembly further includes a first pressing member, which is detachably disposed at one end of the push rod. The push rod is provided with a first limiting member, and the first bracket assembly is clamped between the first pressing member and the first limiting member.

4. The planetary roller screw mechanism according to claim 1, characterized in that, The transmission component is configured as a lead screw structure, and the drive assembly includes: The second nut extends along the first direction and is rotatable; The second support assembly is sleeved on one end of the transmission member, and the second support assembly engages with the interior of the second nut and the outer wall of the transmission member.

5. The planetary roller screw mechanism according to claim 4, characterized in that, One end of the transmission component is provided with a second external toothed threaded sleeve; The second support assembly includes two second planetary carriers and a plurality of second rollers. The two second planetary carriers are respectively disposed on both sides of the second rollers. The outer wall of the second rollers is provided with external threads, and the external threads mesh with the inner wall of the transmission member and the outer wall of the second external toothed sleeve.

6. The planetary roller screw mechanism according to claim 5, characterized in that, The drive assembly further includes a drive motor, which is connected to the second nut, and the output shaft of the drive motor is coaxial with the second nut. And / or, the drive assembly further includes a drive motor, the output shaft of the drive motor is provided with a first engagement portion, the outer wall of the second nut is provided with a second engagement portion, and the first engagement portion engages with the second engagement portion.

7. The planetary roller screw mechanism according to claim 1, characterized in that, The transmission component is configured as a nut structure, and the drive assembly further includes: Drive motor; A first lead screw, one end of which is connected to the output shaft of the drive motor, and the transmission component is mounted on the first lead screw; The third support assembly is disposed inside the transmission component and meshes with the inner wall of the transmission component and the outer wall of the first lead screw; Mounting sleeves are disposed on the transmission component. There are two mounting sleeves, which are respectively disposed at opposite ends of the third support assembly and restrict the axial movement of the third support assembly.

8. The planetary roller screw mechanism according to claim 7, characterized in that, The third support assembly includes two third planetary carriers and multiple third rollers. The two third planetary carriers are respectively disposed on opposite sides of the third rollers. The outer wall of the third rollers is provided with external threads, which mesh with the internal threads of the transmission component and the external threads of the first lead screw.

9. The planetary roller screw mechanism according to any one of claims 1-8, characterized in that, The movable component includes a slide rail that extends along the first direction, and the movable element is movably disposed on the slide rail.

10. The planetary roller screw mechanism according to any one of claims 1-8, characterized in that, One end of the transmission component is provided with a first helical gear, and the planetary roller screw mechanism further includes a second helical gear, which is disposed on the first nut and meshes with the first helical gear.

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