Combination returner assembly

Abstract

The application provides a combined returner assembly, which comprises a returner base and a returner insert, wherein the returner base comprises a clamping groove, a ball displacement groove and a guide convex circle; the returner insert comprises a clamping convex and a displacement convex circle; when the returner base and the returner insert are combined, the clamping convex is inserted into the clamping groove to realize detachable fixing of the returner base and the returner insert, and the displacement convex circle is matched with the ball displacement groove to form a continuous ball channel. Through the split mounting and dismounting design, the end plug type nut is more convenient to dismount on the end of the non-through lead screw. The matching of the ball displacement groove and the displacement convex circle provides sufficient passing space for the ball, and solves the interference problem in the assembling and dismounting process. The radius size of the returner assembly raceway center ensures smooth return of the ball and reduces the running noise. The number and stability of the ball installation are improved as a whole, the impact noise of the ball circulation is reduced, the ball installation space is optimized, and the maintenance and overhaul are facilitated.

Description

Technical Field

[0001] This application relates to the field of end-plug type ball screw pair technology, and in particular to a combined reversing device assembly. Background Technology

[0002] Traditional ball screw assemblies are integral return mechanisms. Due to the guide convexity of the return mechanism, it needs to be installed into the nut body first. A guide sleeve is used to fill the nut with balls. Finally, the installed nut assembly is put onto the ball screw. The end of the ball screw must have a through raceway to ensure that the nut assembly can enter smoothly. For scenarios with strict dust prevention requirements at the end of the screw, the only solution is to use subsequent inserts or other methods. Accuracy and rigidity cannot be guaranteed.

[0003] Currently, there are also split-type reversing components on the market to solve the problem of the ball screw end not being connected, but none of them have a ball installation space. This method requires the ball to be installed first, and then the reversing component is installed. Due to interference, only 2-3 fewer balls can be installed. The impact noise of the ball circulation is relatively large, and it also affects the service life of the ball screw pair. Utility Model Content

[0004] To address the problem that existing split-type return assembly lacks ball bearing installation space, resulting in a small number of balls, leading to significant impact noise and affecting the service life of the ball screw pair.

[0005] This application provides a combined reversing assembly for disassembling and assembling ball screws with end plug nuts that do not pass through at the ends, including a reversing base and a reversing insert.

[0006] The reversing unit base includes: a slot, a ball clearance groove, and a guide convex circle;

[0007] The slot is located on the top of the reversing unit base, the ball clearance groove is located near the slot and communicates with the slot, and the guide convex circle is fixed on the side of the reversing unit base facing away from the slot.

[0008] The reversing plug includes: a locking convexity and a clearance convexity;

[0009] The card protrusion is located in the middle of the reversing plug, and the clearance protrusion is fixed at the bottom of the reversing plug away from the card protrusion.

[0010] When the reversing base and the reversing plug are combined, the card protrusion is inserted into the card slot to achieve detachable fixing of the reversing base and the reversing plug, and the relief protrusion is aligned with the ball relief groove to form a continuous ball channel.

[0011] In one feasible implementation, the diameter of the ball mounting space formed by the clearance convex circle and the ball clearance groove is 0.15mm-0.2mm larger than the diameter of the ball;

[0012] The raceway center radius R of the returner assembly, which is formed by the returner base and the returner plug, satisfies the following relationship:

[0013] R>1.5Dw;

[0014] Where Dw is the diameter of the ball bearing.

[0015] In one feasible implementation, the return device base further includes: a first component positioning ear;

[0016] The first component positioning ear is located on top of the return base and away from the ball relief groove;

[0017] The first component positioning ear has a first axial positioning protrusion on the surface of the return base with the slot.

[0018] In one feasible implementation, the return plug-in further includes: a second component positioning ear;

[0019] The second component positioning ear is located at the end of the return plug away from the locking protrusion and the clearance protrusion;

[0020] The second component positioning ear has a second axial positioning protrusion on the side of the return plug facing away from the clearance convex circle.

[0021] In one feasible implementation, both the first axial positioning protrusion and the second axial positioning protrusion are dot-shaped protrusions.

[0022] The first axial positioning protrusion and the second axial positioning protrusion form an axial interference fit of 0.1mm-0.3mm with the inner hole of the nut using an elastic retaining ring.

[0023] In one feasible implementation, when the reversing base and the reversing plug are combined, the first axial positioning protrusion and the second axial positioning protrusion are orthogonally distributed.

[0024] The first component positioning ear located on the reversing gear base contacts the axial inner wall of the nut; the second component positioning ear located on the reversing gear insert contacts the radial inner wall of the nut.

[0025] This allows the first and second axial positioning protrusions to form a bidirectional constraint structure, limiting the radial displacement and angular deflection of the reversing assembly.

[0026] In one feasible implementation, the reversing base further includes a first return positioning post, and the reversing plug further includes a second return positioning post;

[0027] The first return positioning post is fixed at the bottom of the returner base, away from the slot and close to the ball relief groove, and the first return positioning post is a columnar protrusion.

[0028] The second return positioning post is fixed to the bottom of the return plug on the side away from the second component positioning ear;

[0029] Furthermore, the axial direction of the first return positioning post is parallel to the assembly direction of the second return positioning post. When the return unit base is combined with the return unit plug, the first return positioning post and the second return positioning post are inserted into the countersunk groove of the nut return hole.

[0030] In one feasible implementation, the reversing device plug-in further includes: a retaining ring limiting wall;

[0031] The retaining ring limiting wall is fixed to the end of the return plug that faces away from the card protrusion in the middle, and the retaining ring limiting wall is a wall-shaped structure perpendicular to the mounting surface;

[0032] When the reversing base is combined with the reversing plug, the retaining ring limiting wall contacts the outer ring of the elastic retaining ring of the external hole.

[0033] In one feasible implementation, the guide convex circle is a cylindrical protrusion, and the guide convex circle is fixed to the end of the reversing unit near the top and away from the slot;

[0034] When the return assembly is mounted on the ball screw, the guide convex circle extends into the ball screw track, and the axis of the guide convex circle is parallel to the axis of the screw.

[0035] In one feasible implementation, the top of the return plug is provided with a disassembly slot;

[0036] The disassembly groove is located at the end of the reversing insert away from the relief convex circle. The disassembly groove is a groove structure that penetrates the surface of the reversing insert, and the depth direction of the disassembly groove is perpendicular to the mounting surface of the reversing insert.

[0037] The combined reversing assembly provided in this application, through its split installation and disassembly design, makes the installation and removal of the end-plug nut, which does not penetrate the end of the ball screw, more convenient, while also meeting the requirements of applications with strict end dust prevention. The fit between the ball clearance groove and the clearance convex circle provides ample space for the balls to pass through, solving the interference problem during assembly and disassembly. The center radius of the raceway of the reversing assembly ensures smooth ball reversal and reduces operating noise. The design of the assembly positioning lug and axial positioning protrusion ensures that the reversing assembly is accurately positioned on the nut and is stable and reliable, maintaining an appropriate interference fit with the elastic retaining ring in the hole, effectively avoiding axial movement and vibration noise. The overall design not only increases the number and stability of ball installations but also significantly reduces the impact noise of ball circulation, extends the service life of the ball screw pair, and optimizes the ball installation space, facilitating maintenance and repair, demonstrating broad application prospects. Attached Figure Description

[0038] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the embodiments of the present invention. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0039] Figure 1 This is a schematic diagram of the front structure of the reversing base shown in an exemplary embodiment of this application;

[0040] Figure 2 This is a schematic diagram of the back structure of the reversing base, as exemplarily shown in an embodiment of this application;

[0041] Figure 3 This is a schematic diagram of the front structure of the return plug-in as exemplarily shown in an embodiment of this application;

[0042] Figure 4 This is a schematic diagram of the back structure of the reflector plug-in, as exemplarily shown in an embodiment of this application;

[0043] Figure 5 This is an exploded view of a combined reversing device assembly exemplarily shown in an embodiment of this application;

[0044] Figure 6 This is an illustrative assembly diagram of the combined retroreflector assembly, as shown in an embodiment of this application.

[0045] Figure 7 This is a schematic diagram of the raceway of a combined reversing assembly, as exemplarily shown in an embodiment of this application;

[0046] Figure 8This is a schematic diagram of the raceway radius of a combined reversing assembly, as exemplarily shown in an embodiment of this application.

[0047] Attached image captions:

[0048] 1-Returner base; 2-Returner insert; 11-Slot; 12-Guide convex circle; 13-Ball clearance groove; 14-First return positioning post; 15-First component positioning ear; 16-First axial positioning protrusion; 21-Slot protrusion; 22-Clearing convex circle; 23-Second component positioning ear; 24-Second axial positioning protrusion; 25-Retaining ring limiting wall; 26-Disassembly groove; 27-Second return positioning post. Detailed Implementation

[0049] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a full understanding of the implementation of embodiments of the present invention.

[0050] Traditional ball screw assemblies use an integral return mechanism. Because of the return mechanism's guide convexity, the nut body must be installed first, then a guide sleeve is used to fill the nut with balls before the nut assembly is threaded onto the ball screw. This requires a continuous raceway at the screw end. For scenarios with strict dust-proof requirements at the screw end, this can only be addressed by subsequent inserts, making it difficult to guarantee accuracy and rigidity. Currently, there are separate return mechanism assemblies on the market that solve the problem of blocked screw ends, but they lack space for ball installation. The balls must be installed first, followed by the return assembly. Due to interference, 2-3 fewer balls are installed, resulting in increased noise from ball recirculation and impact, and affecting service life.

[0051] To solve the above problems, refer to Figures 1-6 As shown, this application provides a combined reversing assembly for disassembling and assembling ball screws with end plug nuts that do not penetrate at the ends, including a reversing base 1 and a reversing plug 2.

[0052] Among them, reference Figure 1 and Figure 2 As shown, the reversing base 1 includes: a slot 11, a ball clearance groove 13 and a guide convex circle 12; the slot 11 is located at the top of the reversing base 1, the ball clearance groove 13 is located at the bottom of the reversing base 1, and the guide convex circle 12 is fixed at one end of the reversing base 1 near the top.

[0053] Reference Figure 3 and Figure 4As shown, the reversing plug 2 includes: a locking protrusion 21 and a relief protrusion 22; the locking protrusion 21 is located in the middle of the reversing plug 2, and the relief protrusion 22 is fixed at the bottom of the reversing plug 2 away from the locking protrusion 21.

[0054] Specifically, the slot 11 is located on the top of the reversing unit base 1, and is a groove structure. The ball clearance groove 13 is located near the slot 11 and communicates with it. The ball clearance groove 13 is an arc-shaped channel, and its spatial diameter is designed to be at least 0.15 mm larger than the diameter of the ball, providing space for the ball to pass through during assembly or disassembly. The guide convex circle 12 is fixed on the side of the reversing unit base 1 facing away from the slot 11. It is a cylindrical protrusion used to extend into the ball screw track to guide the movement of the ball and reduce the impact noise of the reversing motion. The locking protrusion 21 is located on one side of the middle of the reversing unit insert 2. It is a protrusion structure used to cooperate with the slot 11 of the reversing unit base 1 to achieve detachable fixation. The clearance protrusion 22 is fixed on the bottom of the reversing unit insert 2 away from the locking protrusion 21. It is an arc-shaped protrusion that aligns with the ball clearance groove 13 of the reversing unit base 1 to form a continuous ball channel, ensuring smooth passage of the ball.

[0055] When the reversing base 1 and the reversing plug 2 are combined, refer to Figure 5 and Figure 6 As shown, the locking protrusion 21 of the reversing insert 2 is inserted into the locking groove 11 of the reversing base 1, achieving detachable fixation of the two. Simultaneously, the clearance protrusion 22 aligns with the ball clearance groove 13, forming a continuous ball channel. The split structure of the reversing base 1 and the reversing insert 2 allows for step-by-step installation and removal of the components, solving the problem of convenience when installing and removing end-plug nuts on lead screws with non-through ends.

[0056] This embodiment utilizes a detachable return mechanism base 1 and return mechanism insert 2 design, allowing for convenient handling of the balls during assembly and disassembly without requiring a through raceway at the screw end, thus meeting the needs of scenarios with strict dustproof requirements at the end. Simultaneously, the guide convex circle 12 design ensures smooth ball movement and reduces impact noise during return motion. The ball clearance groove 13 provides ample space for the balls to pass through, avoiding interference during assembly and disassembly. This improves the ease of assembly and disassembly of the end-plug type ball screw pair when the end is not through, ensuring smooth and reliable operation while meeting stringent dustproof requirements at the end, thus enhancing the product's applicability.

[0057] In some embodiments of this application, reference is made to Figure 7 and Figure 8As shown, during assembly, the return base 1 is placed first. The ball clearance groove 13 on the return base 1 is 0.15mm-0.2mm larger than its diameter, facilitating the passage of the ball during assembly. For example, if the ball diameter is 5mm, the diameter of the ball installation space ranges from 5.15mm to 5.2mm. This dimension ensures that the ball can pass smoothly during assembly and disassembly, avoiding jamming or damage caused by insufficient space, ensuring that the ball does not encounter excessive resistance during passage, and also preventing instability in ball movement due to excessive space.

[0058] After the ball bearings are assembled, insert the return insert 2. At this point, the ball clearance groove 13 and the clearance convex circle 2 cooperate to combine part of the raceway of the return base 1 and the return insert 2 into a complete ball running raceway. The center radius R of this raceway satisfies the relationship: R>1.5Dw, where Dw is the ball diameter. Taking a ball diameter of 5mm as an example, the center radius R of the raceway needs to be greater than 7.5mm.

[0059] The large center radius of the raceway ensures a reasonable trajectory for the balls within the return assembly, reducing friction and impact during movement and increasing the DN value (the product of speed and lead) of the lead screw pair. When the balls move within the lead screw pair, they smoothly pass through this channel and achieve the return motion.

[0060] During the implementation process, the return unit base 1 is first fixed to the nut or corresponding position during assembly, then the balls are placed into the ball clearance groove 13 on the return unit base 1, and finally the plug 2 is inserted so that the two cooperate to close the raceway, and finally form a closed loop system with the main raceway of the ball screw, so as to realize the full process requirements of smooth ball assembly, stable circulation and efficient return, and ensure the normal operation of the ball screw pair.

[0061] This solution further improves the performance of the combined return screw assembly by precisely controlling the diameter of the ball bearing mounting space and the center radius of the return screw assembly raceway. The rational design of the ball bearing mounting space diameter avoids jamming issues during assembly and disassembly; the accurate control of the return screw assembly raceway center radius ensures smooth and stable ball movement, reduces friction and impact, and improves the overall performance of the screw pair. By optimizing the design of the ball bearing mounting space diameter and the return screw assembly raceway center radius, the applicability and reliability of the combined return screw assembly are improved, meeting the high performance requirements of high-end equipment for ball screw pairs.

[0062] In some embodiments of this application, reference continues to be made to Figure 1As shown, the reversing base 1 also includes a first component positioning ear 15, which is located on the top of the reversing base 1 and away from the ball bearing relief groove 13. The first component positioning ear 15 is provided with a first axial positioning protrusion 16 on the surface of the reversing base 1 near the groove 11, which is used to interfere with external components such as nuts to prevent axial movement of the components.

[0063] During installation, the first component positioning ear 15 and the first axial positioning protrusion 16 will engage with the corresponding structures inside the nut. When the return base 1 is inserted into the return groove on the nut body, the first component positioning ear 15 will be in the corresponding position of the return groove on the nut body, and the first axial positioning protrusion 16 will contact the elastic retaining ring in the hole inside the nut to form an axial interference fit.

[0064] This embodiment ensures the axial positioning accuracy of the reversing unit base 1 on the nut, avoiding operating noise caused by reversing unit vibration. By adding the first component positioning lug 15 and the first axial positioning protrusion 16, the positioning accuracy and stability of the reversing unit base 1 on the nut are further improved.

[0065] The contact between the first component positioning lug 15 and the axial inner wall of the nut, and the interference fit between the first axial positioning protrusion 16 and the elastic retaining ring of the hole, jointly ensure the axial positioning reliability of the return gear base 1, effectively preventing noise caused by axial movement and vibration. This ensures the reliability and stability of the combined return gear assembly in high-speed, high-precision motion applications, meeting the high performance requirements of high-end equipment for ball screw pairs.

[0066] In some embodiments of this application, reference continues to be made to Figure 3 As shown, the reversing plug 2 also includes a second component positioning ear 23, which is located at the end of the reversing plug 2 away from the locking protrusion 21 and the relief protrusion 22. The side of the second component positioning ear 23 near the reversing plug 2 facing away from the relief protrusion 22 is provided with a second axial positioning protrusion 24, which is used to interfere with external components such as nuts to further prevent axial movement of the components.

[0067] During installation, the second component positioning ear 23 and the second axial positioning protrusion 24 will engage with the corresponding structure inside the nut. When the reversing insert 2 is combined with the reversing base 1, the second component positioning ear 23 will be positioned in the corresponding position of the reversing groove in the nut body, and the second axial positioning protrusion 24 will contact the elastic retaining ring in the hole inside the nut to form an axial interference fit.

[0068] Understandably, the cooperation between the second component positioning ear 23 and the second axial positioning protrusion 24, and the first component positioning ear 15 and the first axial positioning protrusion 16, forms an all-round positioning of the reversing assembly on the nut, ensuring the stability and reliability of the combined reversing assembly.

[0069] This embodiment, by adding a second component positioning ear 23 and a second axial positioning protrusion 24, complements the first component positioning ear 15 and the first axial positioning protrusion 16, jointly ensuring the omnidirectional positioning of the reversing assembly on the nut. This effectively prevents axial movement and radial displacement of the assembly in high-speed, high-precision motion applications, improving the overall performance of the combined reversing assembly.

[0070] In some embodiments of this application, the first axial positioning protrusion 16 and the second axial positioning protrusion 24 are both dot-shaped protrusions, respectively located on the surface of the first component positioning ear 15 and the second component positioning ear 23 near the center of the reversing base 1 and the reversing plug 2. These dot-shaped protrusions are used to form an axial interference fit of 0.1mm-0.3mm with the elastic retaining ring in the hole of the nut, so as to prevent axial movement of the component.

[0071] During assembly, when the return unit base 1 and the return unit insert 2 are respectively inserted into the return unit groove on the nut body, the first axial positioning protrusion 16 and the second axial positioning protrusion 24 respectively contact the elastic retaining ring of the hole inside the nut and form an interference fit. The dotted protrusion structure ensures that even if there is a machining error of ±0.1mm in the axial accuracy of the nut return unit groove, the positioning protrusion and the elastic retaining ring of the hole can still maintain an axial interference of 0.1mm-0.3mm, thereby effectively preventing axial movement of the return unit assembly.

[0072] This embodiment further improves the axial positioning accuracy and stability of the return screw assembly on the nut by precisely controlling the shape and position of the first axial positioning protrusion 16 and the second axial positioning protrusion 24, as well as their fit with the elastic retaining ring in the inner hole of the nut. The dotted protrusion design makes the fit more precise and reliable, while the control of the interference fit ensures that a stable axial positioning effect is maintained even in the presence of machining errors. By further optimizing the design and fit of the axial positioning protrusions, the axial positioning accuracy and stability of the combined return screw assembly on the nut are improved, effectively preventing axial movement and the resulting operating noise, and improving the overall performance and service life of the ball screw pair.

[0073] In some embodiments of this application, when the reversing base 1 and the reversing plug 2 are combined, the first axial positioning protrusion 16 and the second axial positioning protrusion 24 are orthogonally distributed. Specifically, the first component positioning ear 15 located on the reversing base 1 contacts the axial inner wall of the nut, while the second component positioning ear 23 located on the reversing plug 2 contacts the radial inner wall of the nut. This orthogonal distribution relationship makes the first axial positioning protrusion 16 and the second axial positioning protrusion 24 form a bidirectional constraint structure, effectively limiting the radial displacement and angular deflection of the reversing assembly.

[0074] This bidirectional constraint structure precisely fixes the position of the return assembly on the nut. The orthogonal distribution of the first axial positioning protrusion 16 and the second axial positioning protrusion 24 restricts the radial displacement and angular deflection of the return assembly, ensuring its stable positioning on the nut. Simultaneously, it reduces operating noise caused by assembly vibration and improves the overall performance of the ball screw pair.

[0075] This design forms a bidirectional constraint structure for the return screw assembly through orthogonally distributed first axial positioning protrusions 16 and second axial positioning protrusions 24. This structure effectively limits the radial displacement and angular deflection of the assembly, improves the positioning accuracy and stability of the assembly on the nut, effectively prevents radial displacement and angular deflection, reduces operating noise, and improves the overall performance and service life of the ball screw pair.

[0076] In some embodiments of this application, reference is made to Figure 1 and Figure 4 As shown, the reversing base 1 also includes a first return positioning post 14, and the reversing insert 2 also includes a second return positioning post 27. The first return positioning post 14 is fixed to the bottom of the reversing base 1 at one end away from the slot 11 and close to the ball bearing clearance slot 13. The first return positioning post 14 is a columnar protrusion; it is used to provide basic positioning support. The second return positioning post 27 is fixed to the bottom of the reversing insert 2 on the side away from the second component positioning ear 23, and together with the first return positioning post 14, it completes the precise positioning of the return system.

[0077] Furthermore, the axial direction of the first return positioning post 14 is parallel to the assembly direction of the second return positioning post 27. When the return base 1 and the return plug 2 are combined, the first return positioning post 14 and the second return positioning post 27 are inserted into the countersunk groove of the nut return hole.

[0078] Specifically, the first return positioning post 14 ensures the stability of the reversing unit base 1 during assembly by maintaining its fixed axial direction, and provides a reference for subsequent insertion into the countersunk groove of the nut return hole; the second return positioning post 27 serves as a positioning component for the reversing unit plug 2, assisting in the alignment of the reversing unit plug 2 with the reversing unit base 1. When the reversing unit base 1 and the reversing unit plug 2 are combined, the axial directions of their return positioning posts are parallel, ensuring that they can be smoothly merged and accurately inserted into the countersunk groove of the nut return hole, thereby achieving the connectivity of the entire return system.

[0079] Specifically, during the installation process, the return unit base 1 is first inserted into one side of the countersunk groove of the nut return hole through the first return positioning post 14, and then the return unit insert 2 is inserted into the other side along the same axis direction through the second return positioning post 27, which ensures the smooth transition of the ball during the return motion, reduces impact and noise, and improves the running stability of the lead screw pair.

[0080] Because the two components are aligned in parallel directions, they can be quickly docked without additional adjustments during assembly. This linkage effectively reduces the accumulation of errors during assembly, while improving overall assembly efficiency and solving the assembly difficulties caused by inaccurate positioning in traditional structures.

[0081] Understandably, in traditional ball screw assembly designs, inaccurate return positioning or an uneven transition can lead to excessive impact and noise on the balls during the return process, thus affecting the overall performance of the screw assembly. In this embodiment, the insertion of the first return positioning post 14 and the second return positioning post 27 ensures a smooth transition of the balls during the return motion, reducing impact and noise and improving the operational stability and reliability of the screw assembly. Simultaneously, this design simplifies the assembly process and improves production efficiency.

[0082] In some embodiments of this application, reference is made to Figure 3 As shown, the reversing insert 2 also includes a retaining ring limiting wall 25, which is fixed to one end of the reversing insert 2 facing away from the locking protrusion 21 in the middle and is perpendicular to the mounting surface. When the reversing base 1 is combined with the reversing insert 2, the retaining ring limiting wall 25 contacts the outer ring of the elastic retaining ring of the external hole.

[0083] Understandably, when a ball screw is working, the balls circulate at high speed along the screw raceway and the nut raceway, which will cause periodic impacts on the return mechanism. Especially during acceleration and load changes, the impact will cause the components to vibrate, resulting in ball circulation jamming, increased noise, and long-term vibration will exacerbate component fatigue wear.

[0084] The retaining ring limiting wall 25 is a fixed wall-like structure on the plug-in 2 that is perpendicular to the mounting surface. Its function is to form a tight fit with the elastic retaining ring of the external hole. This tight fit can effectively absorb the energy brought by the impact of the ball, suppress the vibration of the return device, ensure that the return device is always correctly aligned with the raceway, and maintain the smoothness of the ball circulation.

[0085] Furthermore, when the ball screw is overloaded, the impact force of the balls on the reversing mechanism increases dramatically, which may cause the second component positioning ear 23 on the reversing mechanism insert 2 to break or deform. If the second component positioning ear 23 fails, the reversing mechanism insert 2 loses its radial constraint and will move radially in a direction perpendicular to the screw axis, disrupting the alignment between the reversing mechanism and the raceway, causing the balls to be unable to enter or leave the raceway normally, resulting in jamming, damage to the screw or nut.

[0086] The retaining ring limiting wall 25 serves as the second radial limiting structure on the returner insert 2. Its engagement with the elastic retaining ring in the external hole can replace the failed second component positioning ear 23, limiting the radial movement of the returner insert 2. Even if the second component positioning ear 23 is damaged, the retaining ring limiting wall 25 can still maintain the relative position of the returner base 1 and the returner insert 2, preventing the returner from failing to align with the raceway, providing double protection for ball circulation, and improving the reliability of the system under overload.

[0087] This embodiment utilizes a retaining ring limiting wall 25 to provide protection within the ball screw return mechanism structure. When the return mechanism base 1 is combined with the return mechanism insert 2, the retaining ring limiting wall 25 works in conjunction with the elastic retaining ring of the external hole to effectively suppress vibrations caused by external impacts, thereby maintaining the stability of the return mechanism. Furthermore, under overload conditions, the second component positioning ear 23 may be damaged due to excessive force, potentially causing radial movement of the return mechanism. The presence of the retaining ring limiting wall 25 provides additional limiting functionality, forming a double protection for the return mechanism and preventing further damage or operational deviations caused by the failure of the second component positioning ear 23. This ensures the reliability and service life of the ball screw under complex operating conditions.

[0088] In some embodiments of this application, the guide convex circle 12 is a cylindrical protrusion, and its specific position is fixed at the end of the return base 1 near the top and away from the slot 11, so as to realize the docking with the ball screw track.

[0089] When the return assembly is assembled into the ball screw, the guide cam 12 extends into the ball screw track, and the axis of the guide cam 12 is parallel to the screw axis. This effectively guides the movement trajectory of the balls within the track, preventing operational instability caused by misalignment. Specifically, the guide cam 12 provides precise guidance, ensuring that the balls maintain a stable movement path during high-speed operation, thereby solving the technical problem of ball jamming or wear due to insufficient guidance.

[0090] Furthermore, when the ball rolls along the ball track to the return screw area, the cylindrical structure of the guide convex circle 12 applies a lateral constraint force to the ball, enabling it to move along a predetermined trajectory when entering the return screw area. This avoids confusion in the direction of ball movement and ensures the stable operation of the ball screw pair. Subsequently, the ball completes the circulation loop via the return screw insert 2.

[0091] This embodiment solves the problem in traditional ball screw assemblies where the integral reversing mechanism requires a through raceway at the end of the ball screw to ensure smooth insertion of the nut assembly due to the guide convexity. It provides convenience for the installation and removal of end-plug type nuts on screws with non-through ends, while ensuring smooth operation and reliability. This improves the applicability of the ball screw assembly, meets the needs of special scenarios such as those with strict dustproof requirements at the screw end, and guarantees stable operation and low noise characteristics.

[0092] In some embodiments of this application, reference is made to Figure 3 As shown, the top of the reversing plug 2 is provided with a disassembly groove 26, which is located at the end of the reversing plug 2 away from the relief convex circle 22. The disassembly groove 26 is a groove structure that penetrates the surface of the reversing plug 2, and the depth direction of the disassembly groove 26 is perpendicular to the mounting surface of the reversing plug 2, which facilitates the installation and disassembly of the reversing plug 2 and thus improves maintenance efficiency.

[0093] Specifically, the disassembly slot 26 facilitates the disassembly of the reversing assembly. When disassembly and maintenance are required, any hook-type tool can be inserted into the disassembly slot 26 to easily remove the reversing insert 2. After removing the reversing insert 2, the ball bearings are emptied, and then the reversing base 1 is rotated and removed, allowing the nut to disengage from the ball screw. This avoids the time wasted or component damage caused by the difficulty of disassembly in traditional methods.

[0094] This embodiment solves the problem of inconvenient disassembly of traditional reversing components by adding a disassembly slot 26, thus improving maintenance efficiency. Its advantages include reducing the risk of damage to the components during disassembly, extending the component's service life, and also reducing maintenance costs and time.

[0095] As can be seen from the above embodiments, when using the combined reversing device of this application, the reversing device base is rotated at a certain angle and inserted into the reversing device groove on the nut body. During the insertion process, ensure that the ball clearance groove at the bottom of the reversing device base and the reversing device groove wall on the nut body form a ball mounting space larger than the ball diameter by 0.15mm. Rotate the reversing device base so that its guide convex circle enters the ball screw groove. At this time, the first component positioning ear of the reversing device base should be in the corresponding position of the reversing device groove on the nut body.

[0096] Utilizing the created ball bearing mounting space, the required number of balls are inserted, ensuring smooth circulation of the balls between the ball screw and the reversing unit base. The retaining protrusion of the reversing insert is aligned with the retaining groove of the reversing unit base to achieve a detachable interlocking connection, securing the reversing insert to the reversing unit base. Ensure the clearance protrusion of the reversing insert aligns with the ball clearance groove of the reversing unit base, forming a continuous ball bearing channel to guarantee smooth ball passage. An elastic retaining ring is used in the insertion hole, ensuring interference contact between the retaining ring and the first and second axial positioning protrusions on the reversing unit base and reversing insert, as well as the ball screw specifications, ensuring a secure and stable reversing assembly on the nut body.

[0097] When disassembly and maintenance are required, use any hook-type tool to insert into the disassembly slot at the top of the return screw insert and remove the return screw insert. After emptying the balls, rotate and remove the return screw base to disengage the nut from the ball screw.

[0098] In summary, the combined reversing device provided in this application, through its step-by-step installation and disassembly design, makes the installation and removal of the end-plug nut on the non-through-the-end ball screw more convenient, while also meeting the requirements of applications with strict end dust prevention. The fit between the ball clearance groove and the clearance convex circle provides ample space for the balls to pass through, solving the interference problem during assembly and disassembly. The center radius of the raceway of the reversing device component ensures smooth ball reversal and reduces operating noise. The design of the component positioning ear and axial positioning protrusion ensures that the reversing device component is accurately positioned on the nut and is stable and reliable, maintaining an appropriate interference fit with the elastic retaining ring in the hole, effectively avoiding axial movement and vibration noise. The overall design not only increases the number and stability of ball installations but also significantly reduces the impact noise of ball circulation, extends the service life of the ball screw pair, and optimizes the ball installation space, facilitating maintenance and repair, demonstrating broad application prospects.

[0099] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the disclosure in the specification and the embodiments. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein.

Claims

1. A combined returner assembly applied to dismounting and mounting of a ball screw with an end plug type nut, wherein the ball screw is not through at the end, characterized in that, It includes a reversing base (1) and a reversing plug (2); The reversing unit base (1) includes: a slot (11), a ball clearance groove (13), and a guide convex circle (12); The slot (11) is located on the top of the reversing base (1), the ball clearance groove (13) is located near the slot (11) and communicates with the slot (11), and the guide convex circle (12) is fixed on the side of the reversing base (1) facing away from the slot (11). The reversing plug (2) includes: a locking convexity (21) and a clearance convexity (22); The card protrusion (21) is located in the middle of the return plug (2), and the relief protrusion (22) is fixed at the bottom of the return plug (2) away from the card protrusion (21); When the return base (1) and the return plug (2) are combined, the card protrusion (21) is inserted into the card slot (11) to achieve detachable fixing of the return base (1) and the return plug (2), and the relief protrusion (22) is aligned with the ball relief groove (13) to form a continuous ball channel.

2. The combined reversing assembly according to claim 1, characterized in that, The diameter of the ball mounting space formed by the relief convex circle (22) and the ball relief groove (13) is 0.15mm-0.2mm larger than the diameter of the ball; The raceway center radius R of the returner assembly, which is formed by the returner base (1) and the returner plug (2), satisfies the following relationship: R>1.5Dw; Where Dw is the diameter of the ball bearing.

3. The combined reversing device assembly according to claim 1, characterized in that, The return unit base (1) further includes: a first component positioning ear (15); The first component positioning ear (15) is located on top of the return base (1) and away from the ball relief groove (13); The first component positioning ear (15) has a first axial positioning protrusion (16) on the surface of the return base (1) with the slot (11).

4. The combined reversing assembly according to claim 3, characterized in that, The return plug-in (2) also includes: a second component positioning ear (23); The second component positioning ear (23) is located at the end of the return plug (2) away from the locking protrusion (21) and the clearance protrusion (22); The second component positioning ear (23) has a second axial positioning protrusion (24) on the side of the return plug (2) facing away from the relief convex circle (22).

5. The combined reversing assembly according to claim 4, characterized in that, Both the first axial positioning protrusion (16) and the second axial positioning protrusion (24) are dot-shaped protrusions; The first axial positioning protrusion (16) and the second axial positioning protrusion (24) form an axial interference fit of 0.1mm-0.3mm with the elastic retaining ring in the inner hole of the nut.

6. The combined reversing assembly according to claim 4, characterized in that, When the reversing base (1) and the reversing plug (2) are combined, the first axial positioning protrusion (16) and the second axial positioning protrusion (24) are orthogonally distributed. The first component positioning ear (15) located on the reversing base (1) contacts the axial inner wall of the nut; the second component positioning ear (23) located on the reversing insert (2) contacts the radial inner wall of the nut; So that the first axial positioning protrusion (16) and the second axial positioning protrusion (24) form a bidirectional constraint structure, limiting the radial displacement and angular deflection of the reversing assembly.

7. The combined reversing assembly according to claim 4, characterized in that, The reversing device base (1) further includes a first return positioning post (14), and the reversing device plug (2) further includes a second return positioning post (27); The first return positioning post (14) is fixed at the bottom of the return base (1) away from the slot (11) and close to the ball clearance slot (13). The first return positioning post (14) is a columnar protrusion. The second return positioning post (27) is fixed to the bottom of the return plug (2) on the side away from the second component positioning ear (23); Furthermore, the axial direction of the first return positioning post (14) is parallel to the assembly direction of the second return positioning post (27). When the return base (1) and the return plug (2) are combined, the first return positioning post (14) and the second return positioning post (27) are inserted into the countersunk groove of the nut return hole.

8. The combined reversing assembly according to claim 1, characterized in that, The reversing plug (2) also includes: a retaining ring limiting wall (25); The retaining ring limiting wall (25) is fixed to the middle part of the return plug (2) at one end facing away from the card protrusion (21), and the retaining ring limiting wall (25) is a wall-shaped structure perpendicular to the mounting surface; When the reversing base (1) is combined with the reversing plug (2), the retaining ring limiting wall (25) contacts the outer ring of the elastic retaining ring of the outer hole.

9. The combined reversing assembly according to claim 1, characterized in that, The guide convex circle (12) is a cylindrical protrusion, and the guide convex circle (12) is fixed to the end of the reversing base (1) near the top and away from the slot (11); When the return assembly is mounted on the ball screw, the guide convex circle (12) extends into the ball screw track, and the axis of the guide convex circle (12) is parallel to the screw axis.

10. The combined reversing assembly according to claim 1, characterized in that, The top of the reversing plug (2) is provided with a disassembly groove (26); The disassembly groove (26) is located at one end of the reversing plug (2) away from the relief convex circle (22). The disassembly groove (26) is a groove structure that penetrates the surface of the reversing plug (2). The depth direction of the disassembly groove (26) is perpendicular to the mounting surface of the reversing plug (2).

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