A reverse planetary roller screw

Abstract

The utility model relates to the technical field of screw rod, concretely to a reverse planetary roller screw, the roller screw includes: driven mechanism, the driven mechanism includes cylinder, the cylinder one end is provided with the convex ring, the other end symmetry has opened two locating slots, and the cylinder is provided with the thread groove in, drive mechanism, drive mechanism is placed in the driven mechanism, and drive mechanism includes two locating racks, a plurality of driven assemblies are arranged between two locating racks, drive assembly is arranged between a plurality of driven assemblies, the drive assembly includes screw rod, both ends of screw rod are provided with gear, the gear opposite one end of two all is provided with bearing, the convex ring sets up ring shape, and the outer convex arrangement is in the cylinder outer wall, two locating slots all set up present square type. The utility model has the advantages of simple structure, reasonable in design, high transmission precision, smaller size, and is worth promoting and using.

Description

Technical Field

[0001] This utility model relates to the field of lead screw technology, specifically a reverse planetary roller lead screw. Background Technology

[0002] The reverse planetary roller screw is a high-precision transmission component optimized from the traditional planetary roller screw, especially suitable for scenarios such as humanoid robot joints where there are special requirements for spatial layout, load capacity, and transmission efficiency. Its core feature is that it achieves "reverse drive" through structural innovation, that is, the screw moves actively when the nut is fixed, or the nut outputs power in the reverse direction when the screw is fixed, so as to achieve high-load, high-precision linear or rotary motion conversion within a compact space.

[0003] Existing ball screws have complex structures, unreasonable designs, low transmission accuracy, or large overall dimensions, making them unsuitable for applications with strict volume requirements and unable to meet the application needs of high power density, high precision, small size, and large load electromechanical actuators. Utility Model Content

[0004] The purpose of this invention is to provide a reverse planetary roller screw, which has the advantages of simple structure, reasonable design, high transmission accuracy and small size, and solves the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a reverse planetary roller screw, comprising: a driven mechanism, the driven mechanism comprising a cylinder, one end of the cylinder being provided with a convex ring, the other end being symmetrically provided with two positioning grooves, and the cylinder being provided with a threaded groove.

[0006] A driving mechanism is placed inside a driven mechanism. The driving mechanism includes two positioning frames, a plurality of driven components are arranged between the two positioning frames, and a driving component is arranged between the plurality of driven components. The driving component includes a lead screw, both ends of which are provided with gears, and one end of each of the two gears facing each other is provided with a bearing.

[0007] Preferably, the convex ring is annular and protrudes outward from the outer wall of the cylinder, and both positioning grooves are square.

[0008] Preferably, there are six driven components, each of which includes a short shaft with a threaded thread and teeth that mesh with a gear at both ends of the threaded thread.

[0009] Preferably, the end of the lead screw near the convex ring is provided with a long shaft, and the end of the long shaft away from the lead screw is provided with a connecting seat.

[0010] Preferably, the threads on all six short shafts engage with the lead screw.

[0011] Preferably, the outer edges of the plurality of driven components extend beyond the outer edges of the positioning frame, and each driven component engages with a threaded groove.

[0012] Preferably, the two bearings are connected to two positioning frames respectively.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This utility model provides a reverse planetary roller screw, which includes a driven mechanism and a driving mechanism. The overall structure is simple and reasonably designed. The driven mechanism includes a cylinder with a convex ring at one end and two symmetrically positioned grooves at the other end. The cylinder also has a threaded groove. The driving mechanism is located inside the driven mechanism and includes two positioning frames. Several driven components are arranged between the two positioning frames, and a driving component is arranged between the driven components. The driving component includes a lead screw with gears at both ends. Bearings are provided at the opposite ends of the two gears. The rotation of the lead screw drives six threads to rotate, and the six threads mesh with the threaded groove, driving the cylinder to move. The gears on the lead screw mesh with each other, further improving the transmission accuracy. It can also reduce the influence of single-tooth error while distributing the load, achieving micron-level transmission accuracy. This can meet the application requirements of high power density, high precision, small size, and large load electromechanical actuators. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0016] Figure 2 This is an exploded view of the present invention;

[0017] Figure 3 This utility model Figure 2 A schematic diagram of the transmission assembly.

[0018] The reference numerals and names in the figure are as follows:

[0019] 1. Driven mechanism; 11. Cylinder; 12. Convex ring; 13. Positioning groove; 14. Threaded groove; 2. Drive mechanism; 21. Positioning frame; 22. Driven assembly; 221. Short shaft; 222. Thread 1; 223. Tooth; 23. Drive assembly; 231. Lead screw; 232. Gear; 233. Bearing; 234. Long shaft; 235. Connecting seat. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] In the description of the embodiments of this utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the embodiments of this utility model and simplifying the description. They 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, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0022] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0023] Please see Figures 1 to 3 The present invention provides an embodiment of a reverse planetary roller screw, comprising: a driven mechanism 1, the driven mechanism 1 comprising a cylinder 11, one end of the cylinder 11 being provided with a protruding ring 12, and the other end being symmetrically provided with two positioning grooves 13, and the cylinder 11 being provided with a threaded groove 14, the protruding ring 12 being annular and protruding outward on the outer wall of the cylinder 11, and both positioning grooves 13 being square;

[0024] Drive mechanism 2 is located within driven mechanism 1. Drive mechanism 2 includes two positioning frames 21, with several driven components 22 disposed between the two positioning frames 21. Drive components 23 are disposed between the driven components 22. Drive components 23 include lead screws 231, with gears 232 at both ends of the lead screws 231. Bearings 233 are disposed at the opposing ends of the two gears 232. There are six driven components 22, each of which includes a short shaft 221 with a thread 222 on it. Furthermore, the short shafts 221 are provided with teeth 223 that mesh with gears 232 at both ends of the thread 222. The end of the lead screw 231 near the convex ring 12 is provided with a long shaft 234, and the end of the long shaft 234 away from the lead screw 231 is provided with a connecting seat 235. The threads 222 on the six short shafts 221 are all meshed with the lead screw 231. The outer edges of several driven components 22 extend out of the outer edges of the positioning frame 21, and each driven component 22 meshes with the thread groove 14. The two bearings 233 are respectively connected to the two positioning frames 21.

[0025] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A reverse planetary roller screw, characterized in that, include: The driven mechanism (1) includes a cylinder (11), one end of which is provided with a protruding ring (12), and the other end is symmetrically provided with two positioning grooves (13), and the cylinder (11) is provided with a threaded groove (14). A drive mechanism (2) is placed inside a driven mechanism (1), and the drive mechanism (2) includes two positioning frames (21). A plurality of driven components (22) are arranged between the two positioning frames (21), and a drive component (23) is arranged between the plurality of driven components (22). The drive component (23) includes a lead screw (231), and gears (232) are provided at both ends of the lead screw (231). A bearing (233) is provided at the opposite end of the two gears (232).

2. The reverse planetary roller screw according to claim 1, characterized in that: The convex ring (12) is arranged in a ring shape and protrudes outward on the outer wall of the cylinder (11), and the two positioning grooves (13) are both arranged in a square shape.

3. The reverse planetary roller screw according to claim 1, characterized in that: The driven assembly (22) is provided in six parts, and each driven assembly (22) includes a short shaft (221). The short shaft (221) is provided with a thread (222), and the short shaft (221) is provided with teeth (223) that mesh with the gear (232) at both ends of the thread (222).

4. A reverse planetary roller screw according to claim 3, characterized in that: The lead screw (231) is provided with a long shaft (234) at one end near the convex ring (12), and a connecting seat (235) is provided at the other end of the long shaft (234) away from the lead screw (231).

5. A reverse planetary roller screw according to claim 3, characterized in that: The threads (222) on the six short shafts (221) are all engaged with the lead screw (231).

6. A reverse planetary roller screw according to claim 1, characterized in that: The outer surfaces of several of the driven components (22) extend beyond the outer surface of the positioning frame (21), and each driven component (22) engages with the threaded groove (14).

7. A reverse planetary roller screw according to claim 1, characterized in that: The two bearings (233) are respectively connected to the two positioning frames (21).

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