Ball screw pair with combined return

Abstract

The application relates to the technical field of end plug type ball screw pairs, and provides a ball screw pair with a combined reverser, which comprises a screw rod and a nut, the nut is sleeved on the screw rod, the inner wall of the nut is provided with reverser grooves, the reverser grooves are two and are arranged at two ends of the nut respectively, and the ball screw pair further comprises a reverser base and a reverser insert, the reverser base comprises a clamping groove, a ball deflection groove and a guide convex circle, the reverser insert comprises a clamping convex and a deflection convex circle, when the reverser base and the reverser insert are combined, the clamping convex is inserted into the clamping groove, so that the reverser base and the reverser insert are detachably fixed, and part of the raceways of the reverser base and the reverser insert are aligned and matched to form a continuous ball channel with the inside of the nut. The application provides sufficient passing space for the ball through the split type mounting and dismounting design, solves the ball interference problem during the dismounting of the nut, guarantees smooth ball reversing and reduces operation noise, optimizes the ball mounting space, and is convenient for maintenance and overhaul.

Description

Technical Field

[0001] This application relates to the field of end-plug type ball screw pair technology, and in particular to a ball screw pair with a combined return mechanism. 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 first. A guide sleeve is then used to fill the nut with balls. Finally, the installed nut assembly is threaded 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, which cannot guarantee accuracy and rigidity.

[0003] Currently, there are also combined reversing assembly 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 assembly is installed. Due to interference, only 2-3 fewer ball can be installed. The impact noise of the ball circulation is relatively large, and it affects the service life of the ball screw pair. Summary of the Invention

[0004] To address the problem that existing combined reversing 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 ball screw assembly with a combined return mechanism, comprising:

[0006] A lead screw with a helical groove on its surface, the helical groove being located in the middle of the lead screw;

[0007] A nut is fitted onto the lead screw, and its inner wall is provided with a return groove. There are two return grooves, which are respectively located at both ends of the nut. The return grooves are connected to the helical channel.

[0008] The reversing assembly consists of a separate reversing base and a reversing plug-in;

[0009] There are two return assemblies, which are disposed opposite to each other in the return slots at both ends of the nut;

[0010] The reversing unit base includes: a slot, a ball clearance groove, and a guide convex circle;

[0011] 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.

[0012] The reversing plug includes: a locking convexity and a clearance convexity;

[0013] The clamping protrusion is arranged in the middle of the reverser insert, and the clearance protrusion is fixed at the bottom of the reverser insert away from the end of the clamping protrusion;

[0014] When the reverser base and the reverser insert are combined, the reverser base is inserted into the reverser groove of the nut, and the guide protrusion extends into the spiral channel of the lead screw;

[0015] When the reverser base and the reverser insert are combined, the reverser base is inserted into the reverser groove of the nut, and the guide protrusion extends into the spiral channel of the lead screw;

[0016] The clamping protrusion of the reverser insert is inserted into the clamping groove to achieve detachable fixing of the reverser base and the reverser insert, and the shaft centers of the two opposite rolling tracks of the reverser assembly are collinear to form a continuous ball channel.

[0017] In a feasible implementation, the ball clearance groove and the wall surface of the reverser groove cooperatively form a ball mounting space with a diameter greater than the diameter of the ball by 0.15mm-0.2mm;

[0018] The center radius R of the rolling track of the reverser assembly composed of the reverser base and the reverser insert satisfies the relationship:

[0019] R>1.5Dw;

[0020] Wherein, Dw is the diameter of the ball.

[0021] In a feasible implementation, the reverser base further comprises a first assembly positioning lug;

[0022] The first assembly positioning lug is located at the top of the reverser base and away from the ball clearance groove;

[0023] The first assembly positioning lug is provided with a first axial positioning protrusion on the surface of the reverser base having the clamping groove.

[0024] In a feasible implementation, the reverser insert further comprises a second assembly positioning lug;

[0025] The second assembly positioning lug is located at the end of the reverser insert away from the clamping protrusion and the clearance protrusion;

[0026] The second assembly positioning lug is provided with a second axial positioning protrusion on the side of the reverser insert away from the clearance protrusion.

[0027] In a feasible implementation, the first axial positioning protrusion and the second axial positioning protrusion are both point-shaped protrusions;

[0028] The first axial positioning bump and the second axial positioning bump form an axial interference fit of 0.1mm-0.3mm with the elastic retaining ring of the inner hole of the nut.

[0029] In an available implementation, when the reflector base and the reflector insert are combined, the first axial positioning bump and the second axial positioning bump are orthogonally distributed;

[0030] The first assembly positioning lug on the reflector base is in contact with the axial inner wall of the nut, and the second assembly positioning lug on the reflector insert is in contact with the radial inner wall of the nut;

[0031] So that the first axial positioning bump and the second axial positioning bump form a bidirectional constraint structure to limit the radial displacement and angular deflection of the reflector assembly.

[0032] In an available implementation, the reflector base further comprises a first backflow positioning column, and the reflector insert further comprises a second backflow positioning column;

[0033] The first backflow positioning column is fixed at one end of the reflector base bottom away from the clamping slot and close to the ball accommodation slot, and the first backflow positioning column is a columnar protrusion;

[0034] The second backflow positioning column is fixed at one side of the reflector insert bottom away from the second assembly positioning lug;

[0035] And the axial direction of the first backflow positioning column is parallel to the assembly direction of the second backflow positioning column, when the reflector base and the reflector insert are combined, the first backflow positioning column and the second backflow positioning column are inserted into the nut backflow hole counterbore groove.

[0036] In an available implementation, the reflector insert further comprises a retaining ring limiting wall;

[0037] The retaining ring limiting wall is fixed at one end of the reflector insert middle away from the clamping protrusion, and the retaining ring limiting wall is a wall structure perpendicular to the mounting surface;

[0038] When the reflector base and the reflector insert are combined, the retaining ring limiting wall is in contact with the outer ring of the external hole elastic retaining ring.

[0039] In an available implementation, the guide convex circle is a cylindrical protrusion, and the guide convex circle is fixed at one end of the reflector base close to the top away from the clamping slot;

[0040] When the reflector assembly is assembled on the lead screw, the guide convex circle extends into the spiral channel of the lead screw, and the axis of the guide convex circle is perpendicular to the axis of the lead screw.

[0041] In one possible implementation, the top of the returner insert is provided with a dismounting groove;

[0042] The dismounting groove is arranged at the end of the returner insert away from the clearance convex circle, the dismounting groove is a groove structure penetrating the surface of the returner insert, and the depth direction of the dismounting groove is perpendicular to the mounting surface of the returner insert.

[0043] The application provides a ball screw pair with a combined returner, which realizes higher transmission efficiency and longer service life through optimized structural design. The combined returner is designed for step-by-step installation and dismounting, and the end plug nut is more convenient to dismount on the end of the screw, while meeting the requirements of dustproof use scenarios. The cooperation between the ball clearance groove and the returner groove wall provides sufficient installation space for the ball, solving the interference problem of the ball during assembly and dismounting. The center radius size of the returner assembly raceway ensures smooth return of the ball and reduces operating noise. The design of the assembly positioning ear and the axial positioning convex point ensures accurate positioning of the returner assembly on the nut and is stable and reliable, and maintains a proper interference amount between the hole and the elastic retainer, effectively avoiding axial movement and vibration noise. The overall design not only improves the number and stability of ball installation, but also significantly reduces the impact noise of ball circulation, prolongs the service life of the ball screw pair, optimizes the ball installation space, facilitates maintenance and repair, and has a wide application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0044] The drawings incorporated into the specification and forming a part thereof illustrate embodiments in accordance with the present application and, together with the description, serve to explain the principles of embodiments of the application. It is apparent that the drawings described below are only some embodiments of the present application, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0045] Figure 1 is a structural schematic diagram of a ball screw pair with a combined returner exemplarily shown by the embodiments of the present application;

[0046] Figure 2 is a schematic diagram of the installation mode of the returner base and the ball installation space formed after installation exemplarily shown by the embodiments of the present application;

[0047] Figure 3 is a front structure schematic diagram of the returner base exemplarily shown by the embodiments of the present application;

[0048] Figure 4 is a back structure schematic diagram of the returner base exemplarily shown by the embodiments of the present application;

[0049] Figure 5is a front structural schematic diagram of a reverser insert exemplarily shown by the embodiment of the present application;

[0050] Figure 6 is a back structural schematic diagram of a reverser insert exemplarily shown by the embodiment of the present application;

[0051] Figure 7 is an explosion schematic diagram of a reverser assembly exemplarily shown by the embodiment of the present application;

[0052] Figure 8 is an assembly schematic diagram of a reverser assembly exemplarily shown by the embodiment of the present application;

[0053] Figure 9 is a raceway schematic diagram of a reverser assembly exemplarily shown by the embodiment of the present application;

[0054] Figure 10 is a raceway radius schematic diagram of a reverser assembly exemplarily shown by the embodiment of the present application;

[0055] Figure 11 is an internal state schematic diagram of a reverser assembly in a ball screw pair exemplarily shown by the embodiment of the present application;

[0056] Figure 12 is a schematic diagram of a ball loaded in a ball screw pair exemplarily shown by the embodiment of the present application.

[0057] BRIEF DESCRIPTION OF DRAWINGS

[0058] 10-reverser assembly; 20-nut; 30-screw; 1-reverser base; 2-reverser insert; 11-clamping groove; 12-guiding convex circle; 13-ball accommodation groove; 14-first backflow positioning column; 15-first assembly positioning ear; 16-first axial positioning convex point; 21-clamping convex; 22-accommodation convex circle; 23-second assembly positioning ear; 24-second axial positioning convex point; 25-retainer limiting wall; 26-disassembly groove; 27-second backflow positioning column; 201-reverser groove; 202-ball mounting space; 203-raceway. DETAILED DESCRIPTION

[0059] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the inventive aspects to those skilled in the art. The described features, structures, or characteristics can be combined in any suitable manner in one or more implementations. In the following description, numerous specific details are provided to give a thorough understanding of implementations of the inventive embodiments.

[0060] The traditional ball screw pair is a whole return device. Because of the guide convex circle of the return device, the nut is first installed, the nut is filled with balls by the guide sleeve, and then the nut assembly is worn on the ball screw. This requires that the screw end has a through raceway. For scenes with strict dustproof requirements at the end of the screw, only subsequent bushing and other solutions can be used, and the precision and rigidity are difficult to guarantee. There are currently combined return device assemblies on the market to solve the problem of non-through screw end, but they do not have a ball installation space, and the balls need to be installed first and then the return assembly. Because of interference, 2-3 balls are installed, which causes large ball circulation impact noise and affects the service life.

[0061] To solve the above problems, referring to Figures 1-8 The embodiment provides a ball screw pair with a combined return device, which comprises a screw 30, a nut 20 and a return device assembly 10.

[0062] The screw 30 is provided with a spiral groove on the surface, and the spiral groove is located in the middle part of the screw 30. The nut 20 is sleeved on the screw 30, and the inner wall of the nut 20 is provided with two return device grooves 201. The two return device grooves 201 are respectively arranged at two ends of the nut 20 and are in communication with the spiral groove.

[0063] The return device assembly 10 is composed of a return device base 1 and a return device insert 2 which are separately arranged, and there are two return device assemblies 10 which are oppositely arranged in the return device grooves 201 at two ends of the nut 20. The return device base 1 comprises a clamping groove 11, a ball displacement groove 13 and a guide convex circle 12. The clamping groove 11 is arranged at the top of the return device base 1, the ball displacement groove 13 is arranged at one end close to the clamping groove 11 and is in communication with the clamping groove 11, and the guide convex circle 12 is fixed on the side of the return device base 1 away from the clamping groove 11. The return device insert 2 comprises a clamping convex 21 and a displacement convex circle 22. The clamping convex 21 is arranged in the middle part of the return device insert 2, and the displacement convex circle 22 is fixed at one end of the bottom of the return device insert 2 away from the clamping convex 21.

[0064] The lead screw 30 as the core driving part, through the spiral channel and the ball contact and support the nut 20, the rotary motion is converted into linear motion. The nut 20 is sleeved on the outside of the lead screw 30, which is an executive part, and the inside is movably connected with the lead screw 30 through the ball, and the outside is connected with the workbench and other equipment to realize linear movement. The returner assembly 10 is installed inside the nut 20, guiding the ball circulation, forming an infinite circulation closed path. The clamping groove 11 of the returner base 1 is used for cooperation with the clamping convex 21 of the returner insert 2, so as to realize detachable fixing; the ball deflection groove 13 and the wall surface of the returner groove 201 of the nut 20 form a ball mounting space 202, which is convenient for the ball assembly to pass through; the guide convex circle 12 extends into the spiral channel of the lead screw 30, so as to ensure smooth rolling of the ball and reduce impact noise. The clamping convex 21 of the returner insert 2 cooperates with the clamping groove 11 of the returner base 1, so that the returner insert 2 and the returner base 1 are assembled together to form a raceway 203. The shaft centers of the two opposite raceways 203 of the returner assemblies 10 on the nut 20 are collinear, which, combined with the spiral channel on the lead screw 30, forms a continuously circulating ball channel.

[0065] When the lead screw 30 rotates, due to the slope of the spiral channel, the ball is forced to roll. The ball moves forward along the spiral channel, while pushing the nut 20 to move linearly along the axial direction of the lead screw 30. When the ball rolls to the end of the nut 20, it enters the channel of the returner assembly 10, and the returner assembly 10 guides the ball to bypass the lead screw 30, circulates back to the starting end of the raceway 203, and reenters the load area, realizing the continuity of transmission.

[0066] The traditional integral returner needs a through raceway at the end of the lead screw 30 to ensure the smooth entry of the nut 20, which is difficult to meet the requirements of strict dust prevention at the end. The combined returner assembly 10 solves the problem of the convenience of disassembling the end plug type nut 20 on the non-through lead screw 30, and meets the use scene with strict dust prevention requirements at the end.

[0067] The ball screw pair with the combined returner of the embodiment effectively solves the technical problems existing in the traditional integral returner and the existing combined returner through structural design improvement. The design of the combined returner assembly 10 makes the nut 20 not need to rely on the through raceway at the end of the screw rod 30 to complete the assembly, which adapts to the use scene with strict dustproof requirement at the end, and avoids the problems of precision and rigidity reduction caused by the inlaying sleeve treatment. The matching structure of the detachable returner base 1 and the nut returner groove 201 forms an independent ball mounting space 202, solves the problem of less assembly of balls due to interference in the assembly process, ensures the integrity of the number of balls, and thus improves the transmission efficiency and operation stability. In addition, the setting of the guide convex circle 12 and the give-way convex circle 22 optimizes the rolling path of the balls, reduces the impact and noise in the circulation process of the balls, and further improves the service life of the ball screw pair. Through the detachable fixing mode of the clamping groove 11 and the clamping convex 21, not only the assembly convenience of the returner assembly 10 is enhanced, but also the convenience of subsequent maintenance and repair is provided. The overall structure improves the disassembly convenience of the end plug type ball screw pair under the condition that the end is not through, ensures the smoothness and reliability of operation, meets the strict requirements of end dustproof, and improves the applicability of the product.

[0068] In some embodiments of the present application, referring to Figure 9 and Figure 10 When assembled, the returner base 1 is placed first, the ball give-way groove 13 on the returner base 1 and the wall surface of the nut returner groove 201 form a give-way groove with a size greater than the diameter size of 0.15mm-0.2mm, which facilitates the assembly of the balls. For example, if the ball diameter is 5mm, the ball mounting space 202 has a diameter range of 5.15mm-5.2mm. This size ensures that the balls can pass through smoothly during assembly and disassembly. After the ball assembly is completed, the returner insert 2 is inserted, at this time the ball mounting channel is closed, the part of the raceway of the returner base 1 and the returner insert 2 is combined into a complete ball raceway 203, and the ball operates in the raceway 203. The center radius R of the raceway 203 satisfies the relationship R>1.5Dw, where Dw is the ball diameter. Taking the ball diameter of 5mm as an example, the center radius R of the raceway 203 needs to be greater than 7.5mm.

[0069] The large center radius of the raceway 203 can ensure that the movement trajectory of the ball in the returner assembly 10 is reasonable, reduce the friction and impact in the movement process, and improve the DN value (product of rotational speed and lead) of the ball screw pair. When the ball moves in the ball screw pair, it can smoothly pass through this channel and realize the return movement.

[0070] In the implementation process, during assembly, the reverser base 1 is first fixed into the reverser groove 201 of the nut 20, then the balls are placed into the ball accommodation groove 13 on the reverser base 1, the balls enter the spiral channel from the ball accommodation groove 13, a required number of balls are loaded, the reverser insert 2 is inserted, the reverser base 1 and the reverser insert 2 are matched to form a complete raceway 203, and finally a closed circulation system is formed with the spiral channel of the screw 30, realizing the full-process requirements of smooth assembly, stable circulation and efficient reversal of the balls, and ensuring the normal operation of the ball screw pair.

[0071] The present scheme further improves the performance of the reverser assembly 10 by precisely controlling the diameter of the ball mounting space 202 and the center radius of the raceway 203 of the reverser assembly 10. The reasonable design of the diameter of the ball mounting space 202 avoids the jamming problem of the balls during assembly and disassembly. The accurate control of the center radius of the raceway 203 of the reverser assembly 10 ensures the smoothness and stability of the ball movement, reduces friction and impact, and improves the overall performance of the ball screw pair. By optimizing the design of the diameter of the ball mounting space 202 and the center radius of the raceway 203 of the reverser assembly 10, the applicability and reliability of the reverser assembly 10 are improved, meeting the high requirements of high-end equipment on the performance of the ball screw pair.

[0072] In some embodiments of the present application, continuing to refer to Figure 1 As shown in the figure, the reverser base 1 also includes a first assembly positioning ear 15 located at the top of the reverser base 1 and away from the ball accommodation groove 13. The first assembly positioning ear 15 is provided with a first axial positioning bump 16 on the surface of the reverser base 1 close to the clamping groove 11, which is used for interference fit with external components such as the nut 20 to prevent axial movement of the components.

[0073] During installation, the first assembly positioning ear 15 and the first axial positioning bump 16 will cooperate with the corresponding structure in the nut 20. When the reverser base 1 is inserted into the reverser groove 201 on the nut 20, the first assembly positioning ear 15 will be in the corresponding position of the reverser groove 201 on the nut 20, and the first axial positioning bump 16 will be in contact with the elastic check ring clamped in the hole of the nut 20, forming an axial interference fit.

[0074] The present embodiment ensures the axial positioning accuracy of the reverser base 1 on the nut 20, avoiding operation noise caused by reverser vibration. By increasing the design of the first assembly positioning ear 15 and the first axial positioning bump 16, the positioning accuracy and stability of the reverser base 1 on the nut 20 are further improved.

[0075] The contact of the first assembly positioning lug 15 with the inner wall of the nut 20 and the interference fit of the first axial positioning bump 16 with the hole elastic stopper ensure the axial positioning reliability of the returner base 1, effectively preventing axial movement and noise caused by vibration. This ensures the reliability and stability of the returner assembly 10 in high-speed and high-precision motion applications, meeting the high requirements of high-end equipment for the performance of ball screw pairs.

[0076] In some embodiments of the present application, continuing to refer to Figure 3 As shown in the figure, the returner insert 2 also includes a second assembly positioning lug 23 located at the end of the returner insert 2 away from the card convex 21 and the give-way convex circle 22; the second assembly positioning lug 23 is provided with a second axial positioning bump 24 on the side of the returner insert 2 facing away from the give-way convex circle 22, which is used to interfere with the external assembly such as the nut 20, further preventing axial movement of the assembly.

[0077] During installation, the second assembly positioning lug 23 and the second axial positioning bump 24 will cooperate with the corresponding structure in the nut 20. When the returner insert 2 is combined with the returner base 1, the second assembly positioning lug 23 will be in the corresponding position of the nut 20 main body returner groove, and the second axial positioning bump 24 will be in contact with the hole elastic stopper installed in the nut 20, forming an axial interference fit.

[0078] It can be understood that the cooperation of the second assembly positioning lug 23 and the second axial positioning bump 24 with the first assembly positioning lug 15 and the first axial positioning bump 16 forms a full-range positioning of the returner assembly 10 on the nut 20, ensuring the stability and reliability of the returner assembly 10.

[0079] This embodiment increases the design of the second assembly positioning lug 23 and the second axial positioning bump 24, which complements the first assembly positioning lug 15 and the first axial positioning bump 16, and together ensures the full-range positioning of the returner assembly 10 on the nut 20. Effectively prevents axial movement and radial displacement of the assembly in high-speed and high-precision motion applications, improving the overall performance of the returner assembly 10.

[0080] In some embodiments of the present application, further, the first axial positioning bump 16 and the second axial positioning bump 24 are both point-shaped protrusions, respectively provided on the side of the surface of the first assembly positioning lug 15 and the second assembly positioning lug 23 close to the center of the returner base 1 and the returner insert 2. These point-shaped protrusions are used to form an axial interference fit of 0.1mm-0.3mm with the hole elastic stopper installed in the nut 20, to prevent axial movement of the assembly.

[0081] In the assembly process, when the deflector base 1 and the deflector insert 2 are inserted into the deflector groove 201 on the nut 20 respectively, the first axial positioning protrusion 16 and the second axial positioning protrusion 24 are in contact with the elastic stopper ring fitted in the hole of the nut 20, and form an interference fit. The point-shaped protrusion structure ensures that even if there is a ±0.1mm machining error in the axial accuracy of the nut 20 deflector groove, the axial interference between the positioning protrusion and the hole elastic stopper ring can still maintain 0.1mm-0.3mm, thereby effectively preventing the axial movement of the deflector assembly 10.

[0082] The present embodiment further improves the axial positioning accuracy and stability of the deflector assembly 10 on the nut 20 by precisely controlling the shape, position and fitting relationship of the first axial positioning protrusion 16 and the second axial positioning protrusion 24 with the elastic stopper ring in the hole of the nut 20. The point-shaped protrusion design makes the fit more accurate and reliable, and the control of the interference ensures that even in the presence of machining errors, stable axial positioning effect can still be maintained. By further optimizing the design of the axial positioning protrusion and the fitting relationship, the axial positioning accuracy and stability of the deflector assembly 10 on the nut 20 are improved, effectively preventing axial movement and the resulting operating noise, and improving the overall performance and service life of the ball screw pair.

[0083] In some embodiments of the present application, further, when the deflector base 1 and the deflector insert 2 are assembled, the first axial positioning protrusion 16 and the second axial positioning protrusion 24 are orthogonally distributed. Specifically, the first assembly positioning ear 15 located on the deflector base 1 is in contact with the axial inner wall of the nut 20, and the second assembly positioning ear 23 located on the deflector insert 2 is in contact with the radial inner wall of the nut 20. 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 deflector assembly 10.

[0084] Through this bidirectional constraint structure, the position of the deflector assembly 10 on the nut 20 is accurately fixed, and through the orthogonal distribution of the first axial positioning protrusion 16 and the second axial positioning protrusion 24, the radial displacement and angular deflection of the deflector assembly 10 are limited, ensuring the stable positioning of the deflector assembly 10 on the nut 20. At the same time, it also reduces the operating noise caused by assembly vibration, improving the overall performance of the ball screw pair.

[0085] The present scheme forms a bidirectional constraint structure for the returner assembly 10 through the orthogonally distributed first axial positioning protrusions 16 and the second axial positioning protrusions 24. This structure effectively limits the radial displacement and angular deflection of the returner assembly 10, improves the positioning accuracy and stability of the returner assembly 10 on the nut 20, effectively prevents radial displacement and angular deflection, reduces operating noise, and improves the overall performance and service life of the ball screw pair.

[0086] In some embodiments of the present application, referring to FIGS. 1-3, Figure 1 and Figure 4 As shown, the returner base 1 further includes a first backflow positioning column 14, and the returner insert 2 further includes a second backflow positioning column 27. The first backflow positioning column 14 is fixed at the end of the returner base 1 away from the clamping groove 11 and close to the ball clearance groove 13, and is a columnar protrusion; for providing basic positioning support. The second backflow positioning column 27 is fixed at the bottom of the returner insert 2 away from the second assembly positioning lug 23 on one side, and cooperates with the first backflow positioning column 14 to complete accurate positioning of the backflow system.

[0087] The axial direction of the first backflow positioning column 14 is parallel to the assembly direction of the second backflow positioning column 27, and when the returner base 1 and the returner insert 2 are combined, the first backflow positioning column 14 and the second backflow positioning column 27 are combined and inserted into the backflow hole counterbore groove of the nut 20.

[0088] Specifically, the first backflow positioning column 14 functions to ensure that the returner base 1 remains stable during assembly by its fixed axial direction, and provides a reference for subsequent insertion of the backflow hole counterbore groove of the nut 20; the second backflow positioning column 27 serves as a positioning component of the returner insert 2, assisting in alignment of the returner insert 2 with the returner base 1. When the returner base 1 and the returner insert 2 are combined, the axial directions of their backflow positioning columns are parallel, ensuring that they can be smoothly combined and accurately inserted into the backflow hole counterbore groove of the nut 20, thereby achieving connectivity of the entire backflow system.

[0089] Specifically, during installation, the returner base 1 is first inserted into one side of the backflow hole counterbore groove of the nut 20 through the first backflow positioning column 14, and then the returner insert 2 is inserted into the other side along the same axial direction through the second backflow positioning column 27, ensuring smooth transition of the ball during return movement, reducing impact and noise, and improving the running stability of the ball screw pair.

[0090] Since the assembly directions of the two are parallel, they can be quickly connected without additional adjustment during assembly. This linkage effectively reduces error accumulation during assembly, while improving overall assembly efficiency and solving the problem of assembly difficulty caused by inaccurate positioning in traditional structures.

[0091] It can be understood that in the traditional ball screw pair design, if the return positioning is inaccurate or the transition is not smooth, it may cause the ball to be subjected to excessive impact and noise during the return process, thereby affecting the overall performance of the ball screw pair. In the present embodiment, the insertion of the first return positioning column 14 and the second return positioning column 27 ensures the smooth transition of the ball during the return movement, reduces the impact and noise, and improves the running stability and reliability of the ball screw pair. At the same time, the design also simplifies the assembly process and improves the production efficiency.

[0092] In some embodiments of the present application, referring to Figure 5 As shown, the returner insert 2 also includes a retainer limiting wall 25, which is a wall structure fixed at one end of the returner insert 2 away from the clamping convex 21, perpendicular to the mounting surface. When the returner base 1 is combined with the returner insert 2, the retainer limiting wall 25 contacts the outer ring of the elastic retainer for external holes.

[0093] It can be understood that when the ball screw pair is working, the ball circulates at high speed along the spiral groove of the screw 30 and the ball channel in the nut 20, which will cause periodic impact on the returner, especially when accelerating or load changing, the impact will cause component vibration, leading to ball circulation jam, noise increase, and long-term vibration aggravating component fatigue loss.

[0094] The retainer limiting wall 25 is a fixed wall structure on the returner insert 2 perpendicular to the mounting surface, which functions to form a close fit with the elastic retainer for external holes. This close fit can effectively absorb the energy brought by the ball impact, suppress the returner vibration, ensure that the returner is always correctly aligned with the raceway, and maintain the smoothness of the ball circulation.

[0095] Further, when the ball screw pair is overloaded, the impact force of the ball on the returner assembly 10 increases sharply, which may cause the second assembly positioning ear 23 on the returner insert 2 to break or deform. If the second assembly positioning ear 23 fails, the returner insert 2 loses radial constraint and will move radially in the direction perpendicular to the axis of the screw 30, which will destroy the alignment of the returner with the raceway, cause the ball to be unable to normally enter or leave the raceway, and lead to jam, damage of the screw 30 or the nut 20.

[0096] The retainer limiting wall 25, as the second radial limiting structure on the returner insert 2, can replace the failed second assembly positioning ear 23 by cooperating with the elastic retainer for external holes, limiting the radial movement of the returner insert 2. Even if the second assembly positioning ear 23 is damaged, the retainer limiting wall 25 can still maintain the relative position of the returner base 1 and the returner insert 2, prevent the alignment failure of the returner with the raceway, provide double protection for the ball circulation, and improve the reliability of the system under overload.

[0097] The embodiment plays a protective role in the ball screw returner structure by designing the check ring limiting wall 25. When the returner base 1 is combined with the returner insert 2, the check ring limiting wall 25 cooperates with the external hole elastic check ring, which can effectively suppress the vibration caused by external impact, thereby maintaining the stability of the returner. In addition, in the case of overload, the second component positioning ear 23 may be damaged due to excessive force, thereby causing the radial movement of the returner. The presence of the check ring limiting wall 25 can provide additional limiting function, forming a double protection for the returner, preventing further damage or operation deviation caused by the failure of the second component positioning ear 23. The reliability and service life of the ball screw pair under complex working conditions are ensured.

[0098] In some embodiments of the present application, the guide convex circle 12 is a cylindrical protrusion, which is fixed at a specific position of the returner base 1 close to the top and away from one end of the clamping groove 11, realizing the butt joint with the spiral groove of the ball screw pair.

[0099] When the returner assembly 10 is assembled to the ball screw pair, the guide convex circle 12 extends into the spiral groove of the screw 30, and the axis of the guide convex circle 12 is perpendicular to the axis of the screw 30, so as to effectively guide the movement trajectory of the ball in the ball track, avoiding the unstable operation problem caused by deviation. Specifically, the guide convex circle 12 provides precise guiding function, ensuring that the ball maintains a stable movement path during high-speed operation, thereby solving the technical problem of ball jamming or wear caused by insufficient guidance.

[0100] Further, when the ball rolls along the ball track of the screw 30 to the returner area, the cylindrical structure of the guide convex circle 12 applies a lateral restraining force to the ball, so that the ball can move according to the predetermined trajectory when entering the ball track 203 of the returner assembly 10, avoiding the confusion of the movement direction of the ball, thereby ensuring the stable operation of the ball screw pair. Subsequently, the ball completes the circulation loop through the opposite returner assembly 10.

[0101] The embodiment provides convenience for disassembling and assembling the end plug type nut 20 on the non-through end screw 30 through the guide convex circle 12 of the returner base 1, while ensuring smooth and reliable operation, improving the applicability of the ball screw pair, meeting the use requirements of special scenes such as strict dustproof requirements at the end of the screw 30, and ensuring the stability and low noise characteristics of the operation.

[0102] In some embodiments of the present application, as shown in Figure 5 The top of the returner insert 2 is provided with a disassembly groove 26, which is located at the end of the returner insert 2 away from the make-way convex circle 22. The disassembly groove 26 is a groove structure penetrating the surface of the returner insert 2, and the depth direction of the disassembly groove 26 is perpendicular to the mounting surface of the returner insert 2, which facilitates the installation and disassembly operation of the returner insert 2, thereby improving the maintenance efficiency.

[0103] Specifically, the disassembly slot 26 functions to facilitate disassembly of the returner assembly 10. When disassembly is required for maintenance, any hook-shaped tool is inserted into the disassembly slot 26, and the returner insert 2 can be conveniently removed. After the returner insert 2 is removed, the balls are poured out, and the returner base 1 is rotated and removed, so that the nut 20 is separated from the ball screw pair. Time waste or component damage caused by difficult disassembly in the conventional manner is avoided.

[0104] The embodiment adds the disassembly slot 26 to solve the problem of inconvenient disassembly of the conventional returner assembly 10, and improves the maintenance efficiency. The beneficial effects are that the damage risk to the assembly during disassembly is reduced, the service life of the assembly is prolonged, and the maintenance cost and time cost are reduced.

[0105] As can be known from the above embodiment, in use, the returner base is inserted into the returner slot on the nut. During the insertion process, the ball way at the bottom of the returner base forms a ball mounting space with the wall surface of the returner slot on the nut, and the ball mounting space is greater than the diameter of the ball by 0.15 mm. Figure 11 As shown in FIG. 6, the guide convex circle of the returner base enters the ball screw pair channel, and at this time, the first assembly positioning ear of the returner base should be at the corresponding position of the returner slot of the nut.

[0106] As shown in FIG. 6, the guide convex circle of the returner base enters the ball screw pair channel, and at this time, the first assembly positioning ear of the returner base should be at the corresponding position of the returner slot of the nut. Figure 12 As shown in FIG. 6, the guide convex circle of the returner base enters the ball screw pair channel, and at this time, the first assembly positioning ear of the returner base should be at the corresponding position of the returner slot of the nut.

[0107] When disassembly is required for maintenance, any hook-shaped tool is inserted into the disassembly slot at the top of the returner insert, and the returner insert is removed. After the balls are poured out, the returner base is rotated and removed, so that the nut is separated from the ball screw.

[0108] In summary, the ball screw pair with combined returner provided by the application realizes higher transmission efficiency and longer service life through optimized structure design. The combined returner is designed to be installed and disassembled step by step, and the end plug type nut is more convenient to disassemble on the end of the screw, while meeting the dustproof requirement of the end in the use scene. The cooperation between the ball way-out groove and the returner groove wall provides sufficient space for the ball, solving the interference problem in the assembly and disassembly process. The radius size of the returner assembly raceway center ensures smooth return of the ball and reduces the running noise. The design of the assembly positioning ear and the axial positioning convex point ensures the accurate positioning of the returner assembly on the nut and is stable and reliable, and the proper interference between the elastic retainer and the hole effectively avoids the axial movement and vibration noise. The overall design not only improves the number and stability of the ball installation, but also significantly reduces the impact noise of the ball circulation, prolongs the service life of the ball screw pair, optimizes the ball installation space, is convenient for maintenance and repair, and has a wide application prospect.

[0109] Other embodiments of the present disclosure will be apparent to those skilled in the art with the consideration of the specification and the Examples. The application is intended to cover any variations, uses, or adaptations of the present disclosure following the general principles thereof and including the general and specific teachings of the present disclosure.

Claims

1. A ball screw pair with a combined return, characterized by The application relates to a nut (20) and a returner assembly (10) for a screw rod (30). The nut (20) is sleeved on the screw rod (30), and the inner wall of the nut (20) is provided with returner grooves (201); the returner grooves (201) are communicated with the screw grooves. The returner assembly (10) is composed of a returner base (1) and a returner insert (2). The returner assembly (10) is provided on the two ends of the nut (20) and is communicated with the returner grooves (201). The returner base (1) comprises a clamping groove (11), a ball displacement groove (13) and a guide convex circle (12). The clamping groove (11) is arranged on the top of the returner base (1), the ball displacement groove (13) is arranged on one end close to the clamping groove (11) and is communicated with the clamping groove (11), and the guide convex circle (12) is fixed on the side of the returner base (1) away from the clamping groove (11). The returner insert (2) comprises a clamping convex (21) and a displacement convex circle (22). The clamping convex (21) is arranged on the middle part of the returner insert (2), and the displacement convex circle (22) is fixed on the bottom of the returner insert (2) away from the clamping convex (21). When the returner base (1) and the returner insert (2) are combined, the returner base (1) is inserted into the returner groove (201) of the nut (20), and the guide convex circle (12) extends into the screw groove of the screw rod (30). The clamping convex (21) of the returner insert (2) is inserted into the clamping groove (11), so that the returner base (1) and the returner insert (2) are detachably fixed, the shaft centers of the two opposite returner assembly (10) raceways (203) are collinear, and a continuous ball channel is formed. The top of the returner insert (2) is provided with a dismounting groove (26). The dismounting groove (26) is arranged on the end of the returner insert (2) away from the displacement convex circle (22), the dismounting groove (26) is a groove structure penetrating through the surface of the returner insert (2), and the depth direction of the dismounting groove (26) is perpendicular to the mounting surface of the returner insert (2). The ball mounting space (202) formed by the ball displacement groove (13) and the wall surface of the returner groove (201) has a diameter greater than the diameter of the ball by 0.15-0.2 mm.

2. The ball screw assembly with a combined return according to claim 1, wherein The center radius R of the raceway (203) of the returner assembly composed of the returner base (1) and the returner insert (2) satisfies the relationship formula R>1.5Dw. The returner base (1) further comprises a first assembly positioning lug (15). The first assembly positioning lug (15) is located on the top of the returner base (1) and is away from the ball displacement groove (13). The surface of the returner base (1) close to the clamping groove (11) is provided with a first axial positioning convex point (16).

3. The ball screw assembly with a combined return according to claim 1, wherein ​ ​ ​ 4. The ball screw assembly with a combined return according to claim 3, wherein The returner insert (2) further comprises a second component positioning lug (23); The second component positioning lug (23) is located at the end of the returner insert (2) away from the clamping protrusion (21) and the clearance protruding circle (22); The second component positioning lug (23) is provided with a second axial positioning protrusion (24) on the side of the returner insert (2) away from the clearance protruding circle (22).

5. The ball screw assembly with a combined return according to claim 4, wherein The first axial positioning protrusion (16) and the second axial positioning protrusion (24) are both point-shaped protrusions; The first axial positioning protrusion (16) and the second axial positioning protrusion (24) form a 0.1mm-0.3mm axial interference fit with the inner hole of the nut (20) and the elastic retainer ring.

6. The ball screw assembly with a combined return according to claim 4, wherein When the returner base (1) and the returner insert (2) are combined, the first axial positioning protrusion (16) and the second axial positioning protrusion (24) are orthogonally distributed; The first component positioning lug (15) on the returner base (1) is in contact with the axial inner wall of the nut (20), and the second component positioning lug (23) on the returner insert (2) is in contact with the radial inner wall of the nut (20); 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 returner assembly (10).

7. The ball screw assembly with a combined return according to claim 4, wherein The returner base (1) further comprises a first backflow positioning column (14), and the returner insert (2) further comprises a second backflow positioning column (27); The first backflow positioning column (14) is fixed at the end of the bottom of the returner base (1) away from the clamping groove (11) and close to the ball clearance groove (13), and the first backflow positioning column (14) is a column-shaped protrusion; The second backflow positioning column (27) is fixed at the side of the bottom of the returner insert (2) away from the second component positioning lug (23); And the axial direction of the first backflow positioning column (14) is parallel to the assembly direction of the second backflow positioning column (27), when the returner base (1) and the returner insert (2) are combined, the first backflow positioning column (14) and the second backflow positioning column (27) are combined and inserted into the backflow hole counterbore groove of the nut (20).

8. The ball screw assembly with a combined return according to claim 1, wherein The returner insert (2) further comprises a retainer ring limiting wall (25); The retainer ring limiting wall (25) is fixed at the end of the returner insert (2) away from the clamping protrusion (21), and the retainer ring limiting wall (25) is a wall structure perpendicular to the mounting surface; When the returner base (1) and the returner insert (2) are combined, the retainer ring limiting wall (25) is in contact with the outer ring of the external hole elastic retainer ring.

9. The ball screw assembly with a combined return according to claim 1, wherein The guide protruding circle (12) is a cylindrical protrusion, and the guide protruding circle (12) is fixed at the end of the returner base (1) close to the top away from the clamping groove (11); When the returner assembly (10) is assembled on the lead screw (30), the guide protruding circle (12) extends into the spiral channel of the lead screw (30), and the axis of the guide protruding circle (12) is perpendicular to the axis of the lead screw (30).

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