Ball screw pair with a lead-through reverser

Abstract

The utility model relates to a ball screw pair with plug pipe reverser, including screw rod, nut and reverser, the outer circle of screw rod is equipped with the spiral outer rolling groove, the inner hole of nut is equipped with the inner rolling groove with the cooperation of outer rolling groove, and the outer rolling groove and inner rolling groove form spiral raceway together, the outer wall of nut is equipped with the slot, and reverser is inserted and fixed in the slot, and reverser includes a pair of structure same half pipe shape structural member, forms the groove body on each half pipe shape structural member, and one end of half pipe shape structural member has the guide portion of groove body intercommunication, and two half pipe shape structural members mutually adhere along a straight splicing surface and are fixed, make respective groove body together enclose into a closed guide pipe raceway, and the nut adopts square cross section and integrates ear pin shaft, can directly connect with external transmission component, dispense with additional flange or transition block, simplify the whole machine structure, reduce the installation space.

Description

Technical Field

[0001] This utility model relates to the field of mechanical transmission technology, and in particular to a ball screw pair with a tube reversing device. Background Technology

[0002] As a key transmission component that efficiently converts rotary motion into linear motion, ball screw pairs are widely used in CNC machine tools, industrial automation and precision equipment. Their performance is highly dependent on the structural reliability and assembly accuracy of the inverter.

[0003] Existing insert-type ball screw assemblies generally use integrally bent metal tubes as reversers. Not only is it difficult to guarantee the geometric accuracy and surface quality of the internal raceways during the forming process, but the spatial connection between the guide ports at both ends and the helical raceways of the nut is prone to misalignment or steps, resulting in poor ball circulation and increased noise. In addition, these reversers mostly rely on interference fits or external pressure plates for fixation, which are prone to loosening and dislodging under vibration or high load conditions. The nut is usually a cylindrical structure, requiring an additional flange connection to the external actuator, which increases the complexity of the system. Its end dust seal also lacks effective axial restraint and is prone to displacement and failure during reciprocating motion. Furthermore, once the reverser is damaged, it is difficult to disassemble without damage, resulting in high maintenance costs and long maintenance cycles. Utility Model Content

[0004] This invention aims to solve the problems existing in the prior art by providing a ball screw assembly with a tube reversing device that is structurally reliable, easy to manufacture, easy to maintain, and has improved sealing performance.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: This ball screw assembly with a tube reversing device includes a screw, a nut, and a reversing device. The outer circle of the screw is provided with a helical outer groove, and the inner hole of the nut is provided with an inner groove that mates with the outer groove. The outer groove and the inner groove together form a helical raceway. The nut has a slot on its outer wall. The reverser is inserted into and fixed in the slot. The reverser includes a pair of identical semi-tubular structural members. Each semi-tubular structural member has a groove, and one end of the semi-tubular structural member has a guide portion that communicates with the groove. The two semi-tubular structural members are attached and fixed to each other along a straight splicing surface, so that their respective grooves together form a closed guide roller track. The guide roller track is only connected to the outside through guide channels at both ends. Both guide portions have guide channels that communicate with the guide roller track. After the reverser is installed, the guide channels at both ends of it are connected to the spiral raceway inside the nut, so that the ball can form a circulation loop along the spiral raceway, the guide channel and the guide raceway.

[0006] Preferably, the nut has a square cross-section, and the left and right sides of the nut are provided with lugs for connecting with external transmission components.

[0007] Preferably, annular positioning grooves are provided at both ends of the inner hole of the nut for installing dustproof rings.

[0008] Preferably, the ear pin shaft has set screw holes on both sides that extend into the inner hole of the nut, and a limit bolt is threaded into the set screw hole. The inner end of the limit bolt extends into the inner hole of the nut and abuts against the outer side of the dustproof ring to axially limit the dustproof ring. The opening of the set screw hole is provided with a guide chamfer.

[0009] Preferably, a retaining ring is provided on the outer side of the dustproof ring, and a limiting groove is provided at the corresponding position of the inner hole port of the nut. The retaining ring is embedded in the limiting groove to press and fix the dustproof ring.

[0010] Preferably, the outer wall of the nut is further provided with an extraction groove that communicates with the slot. The extraction groove is configured as an elongated opening extending downward from the upper surface of the nut, for inserting a tool to install or remove the reverser.

[0011] Preferably, an annular anti-detachment groove is formed on the inner wall of the slot, and the extension direction of the anti-detachment groove is perpendicular to the axis of the slot; when the nut is provided with an extraction groove, the anti-detachment groove is connected to the extraction groove, which is used to restrict the glue from falling out along the axial direction of the slot after the sealant is poured.

[0012] Preferably, the guide portion is fixedly connected to the end of the semi-tubular structural member through its inner end, and the connecting end face of the guide portion is coplanar with the splicing end face of the semi-tubular structural member.

[0013] Preferably, the two semi-tubular structural components are symmetrical in configuration and are fixed together by a flat splicing surface, and the splicing surface is provided with corresponding interlocking concave-convex fitting structures; the concave-convex fitting structure includes multiple positioning protrusions on the splicing surface of one semi-tubular structural component and multiple positioning grooves on the splicing surface of the other semi-tubular structural component, the positioning protrusions and positioning grooves are correspondingly fitted together, so that the two semi-tubular structural components are precisely aligned and fixed to form the reverser.

[0014] Preferably, the semi-tubular structural member has a main body section and arc-shaped transition sections at both ends of the main body section, wherein one arc-shaped transition section is connected to the guide section, so that the groove body is connected to the guide channel in the guide section through the arc-shaped transition section.

[0015] Preferably, the lower end of the guide portion has a first guide portion and a second guide portion, the first guide portion being located radially inner to the outer groove of the lead screw, and the second guide portion being located radially outer to the outer groove of the lead screw; the first guide portion and the second guide portion together form a continuous enclosed guide channel, one end of the guide channel being connected to the spiral raceway, and the other end of the guide channel being connected to the guide roller raceway through the arc-shaped transition section of the semi-tubular structure.

[0016] This utility model has the following beneficial effects: 1. The nut has a square cross-section and an integrated lug pin shaft, which can be directly connected to external transmission components, eliminating the need for additional flanges or transition blocks, simplifying the overall structure, and reducing installation space. The dustproof ring is multi-directionally limited by the positioning groove, the outer retaining ring, and the limiting bolt in the top screw hole, effectively preventing it from shifting or falling off during high-speed reciprocating motion, ensuring the cleanliness of the raceway. In addition, the nut is provided with an extraction groove that communicates with the slot, which facilitates the non-destructive installation or replacement of the reverser by inserting tools, reducing maintenance costs and extending the product's service life.

[0017] 2. The reverser is made of two semi-tubular structural parts spliced ​​together. The guide roller can be directly processed in a flat state, avoiding the deformation and error caused by traditional tube bending and forming, significantly improving geometric accuracy and surface quality. The semi-tubular structure is symmetrical and has no complex internal cavity. Only one mold is needed for forming. There is no need for a side core pulling mechanism. Demolding is smooth, which is convenient for online inspection and size correction. It is conducive to mold iteration and greatly improves production efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a ball screw pair with a tube reversing device according to the present invention; Figure 2 This is a top view of a ball screw pair with a tube reversing device according to the present invention; Figure 3 This is a schematic diagram of the nut structure; Figure 4 This is a schematic diagram of the positioning groove and limiting groove on the nut. Figure 5 Exploded view of the nut and the reversing device; Figure 6 This is a cross-sectional view of a ball screw assembly with a tube reversing device according to the present invention. Figure 7 This is a schematic diagram of the inverter structure; Figure 8 This is a structural diagram of a semi-tubular structural component.

[0019] Explanation of reference numerals in the attached figures: 1. Lead screw; 100. External roller groove; 2. Nut; 200. Inner hole; 201. Inner groove; 202. Slot; 203. Ear pin; 204. Positioning groove; 205. Dustproof ring; 206. Set screw hole; 207. Limit bolt; 208. Guide chamfer; 209. Retaining ring; 210. Limiting groove; 211. Extraction groove; 212. Anti-detachment groove; 3. Reversing device; 300. Semi-tubular structural component; 301. Groove; 302. Guide part; 303. Positioning protrusion; 304. Positioning groove; 305. Main body section; 306. Arc-shaped transition section; 307. First guide part; 308. Second guide part. Detailed Implementation

[0020] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0021] like Figures 1 to 8 As shown, a ball screw assembly with a reversing device includes a screw 1, a nut 2, and a reversing device 3. The outer circumference of the screw 1 is provided with a helical outer groove 100, and the inner hole 200 of the nut 2 is provided with an inner groove 201 that mates with the outer groove 100. The outer groove 100 and the inner groove 201 together form a helical raceway. A slot 202 is provided on the outer wall of the nut 2, and the reversing device 3 is inserted into and fixed in the slot 202. The reversing device 3 includes a pair of identical semi-tubular structural members 300, each of which has a groove 301 formed on it. Furthermore, one end of the semi-tubular structural component 300 has a guide portion 302 connected to the groove 301. The two semi-tubular structural components 300 are attached and fixed together along a straight splicing surface, so that their respective grooves 301 together form a closed guide raceway. The guide raceway is only connected to the outside through guide channels at both ends. Both guide portions 302 are provided with guide channels that communicate with the guide raceway. After the reverser 3 is installed, the guide channels at both ends are connected to the spiral raceway in the nut 2, so that the ball can form a circulation loop along the spiral raceway, guide channel and guide raceway.

[0022] In this embodiment, the reverser 3 is designed to consist of two identical semi-tubular structural components 300. Each semi-tubular structural component 300 is provided with a groove 301 and a guide portion 302 communicating with it. After the two semi-tubular components are attached and fixed along the straight splicing surface, their grooves 301 together form a closed guide raceway, which is only connected to the outside through guide channels at both ends. This split structure allows the raceway to be processed with high precision in a planar state, avoiding deformation, ellipticity deviation, or surface defects caused by the forming process of traditional integral bending tubes, and significantly improving the geometric accuracy of the raceway. At the same time, the reverser 3 is inserted into the slot 202 on the outer wall of the nut 2. After installation, its guide channels at both ends are precisely connected with the spiral raceway inside the nut 2 to form a continuous closed ball circulation loop, ensuring smooth ball operation, low noise, high transmission efficiency, and convenient disassembly and maintenance.

[0023] Specifically, such as Figures 1 to 5 As shown, the cross-section of nut 2 is square, and ear pins 203 for connecting with external transmission components are provided on the left and right sides of nut 2.

[0024] Nut 2 adopts an integral structure with a square cross-section, and symmetrically arranged ear pins 203 on its left and right sides as mechanical interfaces for direct connection with external transmission components (such as shift forks, connecting rods or sliders). This integrated design eliminates the need for additional flanges or transition connecting blocks required by traditional cylindrical nuts 2, which not only simplifies the overall assembly process and reduces the number of parts, but also effectively reduces the installation space and improves the system rigidity and power transmission responsiveness.

[0025] Furthermore, such as Figures 1 to 5 As shown, both ends of the inner hole 200 of the nut 2 are provided with annular positioning grooves 204 for installing dustproof rings 205.

[0026] An annular positioning groove 204 is provided at both ends of the inner hole 200 of the nut 2 for embedding the dustproof ring 205. The positioning groove 204 provides the dustproof ring 205 with a preliminary circumferential and axial limit reference, so that it is not easy to deviate, warp or fall off during high-speed reciprocating motion. This effectively blocks external dust, chips, oil and other contaminants from entering the ball circulation channel, ensuring the cleanliness of the screw pair, extending its service life, and providing a reliable installation base for subsequent multiple dustproof fixing structures (such as retaining ring 209 and limit bolt 207).

[0027] Furthermore, such as Figure 1 , Figure 4 and Figure 5As shown, the ear pin shaft 203 has set screw holes 206 on both sides that penetrate into the inner hole 200 of the nut 2. A limit bolt 207 is threaded into the set screw hole 206. The inner end of the limit bolt 207 extends into the inner hole 200 of the nut 2 and abuts against the outer side of the dustproof ring 205 to axially limit the dustproof ring 205. A guide chamfer 208 is provided at the opening of the set screw hole 206.

[0028] A set screw hole 206 is provided on both sides of the ear pin shaft 203, extending through the inner hole 200 of the nut 2. A limit bolt 207 is threaded into the hole, with its inner end extending into the inner hole 200 of the nut 2 and abutting against the outer side of the dust ring 205, thereby applying a stable axial clamping force to the dust ring 205 and preventing it from axially moving under high-speed reciprocating motion or vibration conditions. In this embodiment, the opening of the set screw hole 206 is provided with a guide chamfer 208 to facilitate the smooth screwing of the limit bolt 207 and avoid poor thread engagement or damage during assembly. This structure achieves a simple, reliable and adjustable axial limit for the dust ring 205, significantly improving the long-term stability and assembly convenience of the sealing system.

[0029] Furthermore, such as Figures 2 to 5 As shown, a retaining ring 209 is also provided on the outer side of the dustproof ring 205. A limiting groove 210 is provided at the corresponding position of the inner hole 200 of the nut 2. The retaining ring 209 is embedded in the limiting groove 210 to press and fix the dustproof ring 205.

[0030] A retaining ring 209 is added to the outside of the dustproof ring 205, and an annular limiting groove 210 is set at the corresponding position of the inner hole 200 of the nut 2, so that the retaining ring 209 is embedded therein and the dustproof ring 205 is pressed and fixed. This design, together with the positioning groove 204 and the limiting bolt 207, constitutes a multi-directional fixation. The positioning groove 204 provides initial positioning, the retaining ring 209 provides circumferential constraint and auxiliary axial pressing, and the limiting bolt 207 provides main axial preload. This effectively prevents the dustproof ring 205 from loosening or failing due to pressure deformation, thermal expansion and contraction or long-term vibration, greatly enhances the sealing reliability, and enables long-term use under high pollution and high frequency reciprocating working conditions.

[0031] Specifically, such as Figures 1 to 5 As shown, the outer wall of the nut 2 is also provided with an extraction groove 211 that communicates with the slot 202. The extraction groove 211 is a long strip-shaped opening that extends downward from the upper surface of the nut 2, and is used for inserting tools to install or remove the reverser 3.

[0032] An extraction groove 211 communicating with the slot 202 is opened on the outer wall of the nut 2. The extraction groove 211 is a long strip-shaped opening extending downward from the upper surface of the nut 2, allowing slender tools such as tweezers and hooks to be inserted into the slot 202 and directly contact the reverser 3 for pushing in or hooking out. This completely solves the problem that traditional insert-type reversers 3 are difficult to disassemble without damage once they are glued or pressed, significantly improving maintenance convenience, reducing maintenance costs, and avoiding damage to the nut 2 body due to forced prying, thus extending the overall service life of the product.

[0033] Furthermore, such as Figure 1 , Figure 3 and Figure 4 As shown, an annular anti-detachment groove 212 is formed on the inner wall of the slot 202. The extension direction of the anti-detachment groove 212 is perpendicular to the axis of the slot 202. When the nut 2 is provided with an extraction groove 211, the anti-detachment groove 212 is connected to the extraction groove 211, which is used to restrict the glue from falling out along the axial direction of the slot 202 after the sealant is injected.

[0034] A ring-shaped anti-detachment groove 212 is formed on the inner wall of the slot 202, and its extension direction is perpendicular to the axis of the slot 202. When the nut 2 is provided with an extraction groove 211, the anti-detachment groove 212 is connected to the extraction groove 211. After the reverser 3 is installed in place, sealant (casting glue, strong glue, etc.) can be injected into the slot 202 through the extraction groove 211. After the sealant flows into the anti-detachment groove 212, it solidifies to form a transverse "anchoring ring", which effectively prevents the sealant and the reverser 3 from coming out along the axial direction of the slot 202. The sealant is mechanically locked by the geometric groove, which greatly improves the fixation reliability of the reverser 3 under high load and strong vibration environment, while taking into account sealing performance and maintainability, and solving the technical problem of easy aging and delamination of traditional sealant.

[0035] Specifically, such as Figures 5 to 8 As shown, the guide portion 302 is fixedly connected to the end of the semi-tubular structural member 300 through its inner end, and the connecting end face of the guide portion 302 is coplanar with the splicing end face of the semi-tubular structural member 300.

[0036] The guide part 302 is directly fixedly connected to the end of the semi-tubular structure 300 through its inner end, and the connection end face of the two is coplanar with the splicing end face of the semi-tubular structure 300. This makes the overall end face of the reverser 3 flat and without steps or misalignment after splicing. In this embodiment, the coplanar design ensures that the ball enters the guide channel from the guide raceway through the arc transition section 306, and avoids ball jumping, jamming or impact noise caused by structural abrupt changes. This significantly improves the circulation smoothness and transmission stability, and also helps to achieve precise alignment of the two semi-tubular structures 300 during assembly.

[0037] Specifically, such as Figure 5 , Figure 7 and Figure 8 As shown, the two semi-tubular structural components 300 are symmetrically configured and are fixed together by a flat splicing surface. Correspondingly, the splicing surfaces are provided with interlocking concave-convex fitting structures. The concave-convex fitting structure includes multiple positioning protrusions 303 on the splicing surface of one semi-tubular structural component 300 and multiple positioning grooves 304 on the splicing surface of the other semi-tubular structural component 300. The positioning protrusions 303 and the positioning grooves 304 are correspondingly fitted together, so that the two semi-tubular structural components 300 are precisely aligned and fixed to form the reverser 3.

[0038] The two semi-tubular structural components 300 adopt a symmetrical configuration and are tightly fitted and fixed by a flat splicing surface. The splicing surface is provided with a mutually interlocking concave-convex mating structure. Specifically, one half-tube is provided with multiple positioning protrusions 303, and the other half-tube is provided with a matching positioning groove 304 at the corresponding position. The protrusions are embedded in the groove to achieve mechanical self-positioning. This not only ensures that the two half-tubes are quickly and accurately aligned during the assembly process, preventing misalignment or displacement, but also enhances the sealing performance after splicing, avoiding stress concentration or dust leakage in the raceway due to small gaps. The semi-tubular structural component 300 can be formed with only one mold, without the need for a side core pulling mechanism. Demolding is smooth, which facilitates online inspection and dimensional correction, effectively ensuring the consistency and reliability of the overall performance of the reverser 3.

[0039] Specifically, such as Figure 8 As shown, the semi-tubular structural member 300 has a main body section 305 and arc-shaped transition sections 306 located at both ends of the main body section 305. One arc-shaped transition section 306 is connected to the guide section 302, so that the groove 301 is connected to the guide channel in the guide section 302 through the arc-shaped transition section 306.

[0040] The semi-tubular structural component 300 consists of a central main section 305 and two arc-shaped transition sections 306 at both ends. One of the arc-shaped transition sections 306 is connected to the guide section 302, forming a smooth transition area from the closed guide raceway to the open guide channel. The arc-shaped transition section 306 guides the balls to turn smoothly through continuous curvature changes, avoiding motion resistance and wear caused by right angles or abrupt inflection points. This improves the ball circulation efficiency and reduces operating noise and fatigue damage. It also allows the tank 301 to be smoothly connected to the guide channel in the guide section 302 through the arc-shaped transition section 306, enabling long-term stable operation under high-frequency reciprocating conditions.

[0041] Furthermore, such as Figure 6 and Figure 7As shown, the lower end of the guide portion 302 has a first guide portion 307 and a second guide portion 308. The first guide portion 307 is located on the radial inner side of the outer groove 100 of the lead screw 1, and the second guide portion 308 is located on the radial outer side of the outer groove 100 of the lead screw 1. The first guide portion 307 and the second guide portion 308 together form a continuous enclosed guide channel. One end of the guide channel is connected to the spiral raceway, and the other end of the guide channel is connected to the guide roller raceway through the arc transition section 306 of the semi-tubular structural member 300.

[0042] The lower end of the guide section 302 is provided with a first guide section 307 and a second guide section 308. The first guide section 307 is located on the radially inner side of the outer groove 100 of the lead screw 1, close to the center of the lead screw 1, and the second guide section 308 is located on the radially outer side of the outer groove 100 of the lead screw 1, away from the center of the lead screw 1. The two are distributed radially and together enclose a continuous enclosed guide channel. This enclosed guide channel is seamlessly connected to the spiral raceway inside the nut 2. The other end is connected to the guide raceway through the arc transition section 306 of the semi-tubular structural component 300, realizing full circumferential enclosed guidance of the ball, effectively preventing the ball from leaving the track or deviating during the turning process, ensuring that the circulation path is closed, continuous, and low-friction, and significantly improving the transmission accuracy, load-bearing capacity and service life.

[0043] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A ball screw assembly with a tube reversing device, comprising a screw (1), a nut (2), and a reversing device (3), wherein the outer circumference of the screw (1) is provided with a helical outer groove (100), and the inner hole (200) of the nut (2) is provided with an inner groove (201) that mates with the outer groove (100), wherein the outer groove (100) and the inner groove (201) together form a helical raceway, characterized in that: The nut (2) has a slot (202) on its outer wall. The reverser (3) is inserted into and fixed in the slot (202). The reverser (3) includes a pair of identical semi-tubular structural members (300). Each semi-tubular structural member (300) has a groove (301) formed on it. One end of the semi-tubular structural member (300) has a guide part (302) that communicates with the groove (301). The two semi-tubular structural members (300) are attached to each other and fixed along a straight splicing surface, so that their respective grooves (301) together form a closed guide roller. The guide roller is only connected to the outside through guide channels at both ends. Both guide parts (302) are provided with guide channels that communicate with the guide roller. After the reverser (3) is installed, the guide channels at both ends of it are connected to the spiral raceway in the nut (2) respectively, so that the ball can form a circulation loop along the spiral raceway, the guide channel and the guide raceway.

2. A ball screw assembly with a tube reversing device according to claim 1, characterized in that: The nut (2) has a square cross-section, and the left and right sides of the nut (2) are provided with ear pins (203) for connecting with external transmission components.

3. A ball screw assembly with a tube reversing device according to claim 2, characterized in that: The nut (2) has an annular positioning groove (204) at both ends of the inner hole (200) for installing the dust ring (205).

4. A ball screw assembly with a tube reversing device according to claim 3, characterized in that: The ear pin (203) has set screw holes (206) on both sides that extend into the inner hole (200) of the nut (2). A limit bolt (207) is threaded into the set screw hole (206). The inner end of the limit bolt (207) extends into the inner hole (200) of the nut (2) and abuts against the outer side of the dust ring (205) to axially limit the dust ring (205). The opening of the set screw hole (206) is provided with a guide chamfer (208).

5. A ball screw assembly with a tube reversing device according to claim 4, characterized in that: The dustproof ring (205) is also provided with a retaining ring (209) on the outside. The inner hole (200) of the nut (2) is provided with a limiting groove (210) at the corresponding position. The retaining ring (209) is embedded in the limiting groove (210) to press and fix the dustproof ring (205).

6. A ball screw assembly with a tube reversing device according to claim 2, characterized in that: The outer wall of the nut (2) is also provided with an extraction groove (211) that communicates with the slot (202). The extraction groove (211) is a long strip-shaped opening that extends downward from the upper surface of the nut (2) for inserting tools to install or remove the reverser (3).

7. A ball screw assembly with a tube reversing device according to claim 6, characterized in that: A ring-shaped anti-detachment groove (212) is provided on the inner wall of the slot (202). The extension direction of the anti-detachment groove (212) is perpendicular to the axis of the slot (202). When the nut (2) is provided with an extraction groove (211), the anti-detachment groove (212) is connected to the extraction groove (211) to restrict the glue from coming out along the axial direction of the slot (202) after the sealant is injected.

8. A ball screw assembly with a tube reversing device according to claim 1, characterized in that: The guide part (302) is fixedly connected to the end of the semi-tubular structure (300) through its inner end, and the connecting end face of the guide part (302) is coplanar with the splicing end face of the semi-tubular structure (300).

9. A ball screw assembly with a tube reversing device according to claim 1, characterized in that: The two semi-tubular structural components (300) are symmetrical in configuration and are fixed together by a flat splicing surface. The splicing surface is provided with a corresponding interlocking concave-convex fitting structure. The concave-convex fitting structure includes multiple positioning protrusions (303) on the splicing surface of one semi-tubular structural component (300) and multiple positioning grooves (304) on the splicing surface of the other semi-tubular structural component (300). The positioning protrusions (303) and the positioning grooves (304) are correspondingly fitted together, so that the two semi-tubular structural components (300) are precisely aligned and fixed to form the reverser (3).

10. A ball screw assembly with a tube reversing mechanism according to claim 1, characterized in that: The semi-tubular structural member (300) has a main body section (305) and arc-shaped transition sections (306) located at both ends of the main body section (305). One arc-shaped transition section (306) is connected to the guide section (302), so that the groove (301) is connected to the guide channel in the guide section (302) through the arc-shaped transition section (306).

11. A ball screw assembly with a tube reversing mechanism according to claim 10, characterized in that: The lower end of the guide part (302) has a first guide part (307) and a second guide part (308). The first guide part (307) is located on the radial inner side of the outer groove (100) of the lead screw (1), and the second guide part (308) is located on the radial outer side of the outer groove (100) of the lead screw (1). The first guide part (307) and the second guide part (308) together form a continuous enclosed guide channel. One end of the guide channel is connected to the spiral raceway, and the other end of the guide channel is connected to the guide raceway through the arc transition section (306) of the semi-tubular structural member (300).

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