High-load ball screw with end recirculation

Abstract

This application relates to the field of linear actuator technology, and more particularly to a high-load ball screw with an end-circulating component. The component includes a nut fitted onto the screw, with a helical groove formed between the nut and the screw, and a mounting groove on the nut for mounting a circulator. The circulator includes a mounting portion with an abutment surface and a support surface within the mounting groove, the abutment surface and the support surface abutting against each other, and symmetrically arranged threaded holes on the mounting portion. The mounting portion is fixed to the nut by bolts. An insertion portion is connected to the abutment surface of the mounting portion. A lip is connected to the abutment surface of the mounting portion. The insertion portion and the lip have return grooves that connect with the helical groove to form a circulating raceway, within which the load-bearing rolling element reciprocates. This application addresses the high-load ball screw by using bolts to rigidly connect the circulating component to the nut, effectively preventing displacement or vibration of the circulating component during operation.

Description

Technical Field

[0001] This application relates to the field of linear actuator technology, and more particularly to a high-load ball screw with an end circulation component. Background Technology

[0002] As a core component of precision motion conversion mechanisms, ball screws achieve bidirectional conversion between rotary and linear motion by incorporating rolling elements between the screw shaft and the nut mating surface. This screw device utilizes the continuous rolling contact of the rolling elements within the screw's helical raceway to effectively replace traditional sliding friction pairs, thereby significantly improving the smoothness of motion transmission and energy conversion efficiency.

[0003] The existing circulating component is floatingly mounted on the ball nut. The circulating component can move between the nut and the cover plate. The gap between the circulating component and the nut may cause the circulating component to generate slight vibration or noise during the movement of the rolling elements, affecting the transmission accuracy. Foreign objects may enter between the circulating component and the nut, affecting the rolling of the rolling elements, so an additional sealing design is required. Utility Model Content

[0004] The technical problem to be solved by this utility model is that the existing floating installation method of the circulator results in large vibration amplitude and high noise during the operation of the ball screw.

[0005] Therefore, this utility model provides a high-load ball screw with an end circulation component.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A high-load ball screw with an end circulation component includes,

[0008] The components include a lead screw, a nut, a circulator, and a load rolling element. The nut is fitted onto the lead screw, and a helical groove is formed between the nut and the lead screw. The nut is provided with a mounting groove for mounting the circulator.

[0009] The circulator includes,

[0010] The mounting part has an abutment surface and a support surface in the mounting groove. The abutment surface and the support surface abut against each other. The mounting part has symmetrically arranged threaded holes and is fixed to the nut by bolts.

[0011] An insertion part is connected to the abutment surface of the mounting part;

[0012] The lip is connected to the abutment surface of the mounting part. The insertion part and the lip are provided with a return channel. The return channel and the spiral channel are connected to form a circulating raceway. The load rolling element is located in the circulating raceway and rolls back and forth.

[0013] Furthermore, there is a gap between the side wall of the mounting part and the inner wall of the mounting groove.

[0014] Furthermore, a pressure cap is connected to the end of the nut, which presses the circulator into the mounting groove.

[0015] Furthermore, there is a gap between the end face of the mounting portion away from the insertion portion and the pressure cap.

[0016] Furthermore, a support rib is provided between the lip and the insertion part, and a support groove adapted to the support rib is provided on the mounting groove.

[0017] Furthermore, a gap is provided between the side wall of the support rib away from the mounting part and the support groove.

[0018] Furthermore, a gap is provided between the end of the insertion part away from the mounting part and the mounting groove.

[0019] Furthermore, two circulators are provided, and the two circulators are centrally symmetrically arranged on the same side of the nut with the axis of the nut as the center.

[0020] Furthermore, the mounting portion has several weight-reducing grooves on its side wall away from the insertion portion.

[0021] The beneficial effects of this utility model are that, for high-load ball screws, bolts are symmetrically arranged on both sides of the circulator, and the circulator component is fixed to the nut through a rigid connection, which can effectively prevent displacement or vibration of the circulator component during operation, and is especially suitable for high-precision applications. After fixing, the circulator component fits tightly against the mounting groove plane, which can reduce the risk of dust or foreign objects entering the circulation path, and can extend the lubrication life when used with a dustproof device.

[0022] The screw fixing method is a mature technology, and the mounting groove wall is designed with installation allowance, allowing for position adjustment during installation and making it suitable for mass production. After fixing, the circulation component fits tightly against the mounting groove plane, reducing the risk of dust or foreign objects entering the circulation path. When used with a dustproof device, it can extend the lubrication life. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of the structure of a high-load ball screw with an end circulation component in this utility model.

[0025] Figure 2 This is a schematic diagram of the nut structure in this utility model.

[0026] Figure 3This is a schematic diagram of the mounting groove in this utility model.

[0027] Figure 4 This is a schematic diagram of the circulator in this utility model.

[0028] Figure 5 This is a schematic diagram of the weight reduction groove on the circulator in this utility model.

[0029] Figure 6 This is a structural diagram showing the assembly relationship between the circulator and the nut in this utility model.

[0030] Figure 7 It is used to embody Figure 6 Enlarged view of part A of the second gap in the middle.

[0031] Figure 8 It is used to embody Figure 6 Enlarged view of section B in the third gap.

[0032] Figure 9 It is used to embody Figure 6 Enlarged view of section C of the fourth gap in the middle.

[0033] In the diagram: 1. Lead screw body; 2. Nut; 21. Mounting groove; 22. Receiving groove; 211. Support surface; 212. Through hole; 213. Stepped surface; 214. Support groove; 3. Pressure cap; 4. Circulator; 41. Mounting part; 411. Limiting arc surface; 412. Weight reduction groove; 42. Insertion part; 43. Lip; 44. Support rib; 45. Return channel. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0035] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] Reference Figure 1 A high-load ball screw with an end circulation component is disclosed. The circulation device 4 is disposed at the end of the nut 2 in the load rolling element screw. The load rolling element screw includes a screw, a nut 2, a pressure cap 3, and a load rolling element. The nut 2 is sleeved on the screw, and a helical groove is formed between the nut 2 and the screw. The circulation device 4 is provided with a return groove 45, which is connected with the helical groove to form a circulation raceway. The load rolling element is located in the circulation raceway and reciprocates.

[0038] Reference Figure 2 , 3 The nut 2 has a mounting groove 21 at its end for mounting the circulator 4. The mounting groove 21 communicates with a portion of the spiral groove on the nut 2. The circulator 4 is located in the mounting groove 21 and fixed to the end of the nut 2 with bolts. A pressure cap 3 is placed on the end of the nut 2 and presses the circulator 4 into the mounting groove 21. The end of the nut 2 has a receiving groove 22 for accommodating the pressure cap 3. The bottom of the receiving groove 22 has multiple threaded holes. The pressure cap 3 is connected to the nut 2 with screws. In this embodiment, two circulators 4 are centrally symmetrically arranged on each end of the nut 2 with the nut's axis as the center.

[0039] Reference Figure 4 The circulator 4 includes a mounting part 41, an insertion part 42, a lip part 43, and a support part. The insertion part 42, the support part, and the lip part 43 are all connected to the mounting part 41 and are located on the same side of the mounting part 41. The insertion part 42 and the lip part 43 are both provided with a return curved surface. The two return curved surfaces are connected to each other to form a return groove 45. When the load rolling element passes through the return groove 45, it impacts the lip part 43. The support part is provided between the insertion part 42 and the lip part 43 to strengthen the support and enhance the rigidity and strength of the insertion part 42.

[0040] Reference Figure 5 In order to reduce the weight of the circulator 4, a number of weight-reducing grooves 412 are provided on the side wall of the mounting part 41 away from the insertion part 42. The weight-reducing grooves 412 are arranged in a honeycomb pattern on the surface of the mounting part 41, thereby ensuring the strength of the circulator 4 while reducing the weight.

[0041] The inner wall of the mounting groove 21 is provided with a support surface 211, which abuts against the side wall of the mounting part 41 near the insertion part 42 (defined as the abutment surface). The mounting part 41 and the support surface 211 cooperate to support the circulator 4 installed in the mounting groove 21. When the support surface 211 abuts against the mounting part 41, considering the machining accuracy of the mounting groove 21 and the circulator 4, there is a first gap g1 between the side wall of the mounting part 41 and the inner wall of the mounting groove 21, which is used to facilitate the adjustment of the position before the circulator 4 is installed and fixed. Furthermore, a protrusion can be provided on the outer side wall of the mounting part 41. The protrusion is integrally formed with the mounting part 41. An anti-rotation groove adapted to the protrusion is provided on the side wall of the mounting groove 21. The size of the first gap g1 is not particularly limited and can be 100μm to 200μm, thereby limiting the movement of the circulator 4 on the end face plane of the nut 2. Finally, after the relative position is adjusted, the bolts fix the circulator 4 to the nut 2.

[0042] Reference Figure 6 , 7 When the rolling element impacts the circulator 4, due to the resin material chosen for the circulator 4, it undergoes a certain degree of deformation. After the circulator 4 is installed in the mounting groove 21, a second gap g2 exists between the gland 3 and the side wall of the mounting part 41 away from the insertion part 42. The size of the gap g2 is not particularly limited, for example, it is 50μm to 100μm. The mounting part 41 is provided with a threaded hole, and the mounting part 41 is fixed to the end of the nut 2 by bolts.

[0043] Through the first gap and the second gap, axial and radial installation allowances are set in the mounting groove 21. The circulation component can be moved to the correct position and fixed in the mounting groove 21. A gap is left between the circulation component and the pressure cover 3 and both ends are fixed, so that there is a certain deformation buffer space when subjected to the impact force of the rolling element.

[0044] Reference Figure 4 , 8 The support portion is specifically a support rib 44, which connects the insertion portion 42 and the lip 43. The support rib 44 is used to enhance the rigidity and strength of the lip 43. A support groove 214 opposite to the support rib 44 is provided in the mounting groove 21. There is a third gap g3 between the side wall of the support rib 44 away from the mounting portion 41 and the support groove 214. The size of the gap g3 is not particularly limited, for example, it is 50μm to 200μm.

[0045] Reference Figure 4 , 9Furthermore, the portion of the mounting groove 21 that is adapted to the insertion part 42 is called the through hole 212. The through hole 212 is connected to the groove on the nut 2. A stepped surface 213 is provided between the through hole 212 and the groove on the nut 2. A fourth gap g4 is provided between the end face of the insertion part 42 away from the mounting part 41 and the stepped surface 213. The size of the gap g4 is not particularly limited, for example, it is 50μm to 200μm.

[0046] This structure is suitable for high-load rolling element lead screws. In this structure, the rolling elements are relatively large, and the circulator 4 itself is also relatively large, resulting in a large impact on the circulator 4. Therefore, the rigidity requirements for its structure are high. In this application, two threaded holes are symmetrically provided on the mounting part 41, and the mounting part 41 is rigidly fixed to the nut 2 by screws to prevent micro-vibration or noise and improve sealing. Furthermore, in order to control the volume of the circulator 4, only one support rib 44 is provided between the insertion part 42 and the lip part 43 in this embodiment, and a limiting arc surface 411 is provided on the mounting part 41 at the end away from the insertion part 42 to further limit the position of the circulator 4. It should be noted that the center line of the return channel 45 is composed of a straight line and an arc. The straight line is the tangent of the load rolling element at the end of the nut 2, and the plane of the arc is formed by the straight line and the central axis of the through hole 212. The straight line is connected to the tangent of the central axis of the through hole 212, and the radius of the arc is more than 1.5 times the diameter of the rolling element.

[0047] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined by the scope of the claims.

Claims

1. A high-load ball screw with an end circulation component, comprising, The system comprises a lead screw, a nut (2), a circulator (4), and a load rolling element. The nut (2) is fitted onto the lead screw, and a helical groove is formed between the nut (2) and the lead screw. The nut (2) has a mounting groove (21) for mounting the circulator (4). The system is characterized in that... The circulator (4) includes, The mounting part (41) has an abutting surface and a supporting surface (211) in the mounting groove (21). The abutting surface and the supporting surface (211) abut against each other. The mounting part (41) has threaded holes symmetrically arranged. The mounting part (41) is fixed to the nut (2) by bolts. An insertion part (42) is connected to the abutment surface of the mounting part (41); The lip (43) is connected to the abutting surface of the mounting part (41). The insertion part (42) and the lip (43) are provided with a return channel (45). The return channel (45) is connected with the spiral channel to form a circulating raceway. The load rolling element is located in the circulating raceway and rolls back and forth.

2. The high-load ball screw having an end circulating member according to claim 1, characterized by, There is a gap between the side wall of the mounting part (41) and the inner wall of the mounting groove (21).

3. The high-load ball screw having an end circulating member according to claim 1, characterized by, The end of the nut (2) is connected to a pressure cap (3), which presses the circulator (4) into the mounting groove (21).

4. The high-load ball screw having an end circulating member according to claim 3, characterized by, There is a gap between the end face of the mounting part (41) away from the insertion part (42) and the cover (3).

5. The high-load ball screw having an end circulating member according to claim 1, characterized by, A support rib (44) is provided between the lip (43) and the insertion part (42), and a support groove (214) adapted to the support rib (44) is provided on the mounting groove (21).

6. The high-load ball screw having an end circulating member according to claim 5, characterized by, A gap is provided between the side wall of the support rib (44) away from the mounting part (41) and the support groove (214).

7. The high-load ball screw having an end circulating member according to claim 1, characterized by, A gap is provided between the end of the insertion part (42) away from the mounting part (41) and the mounting groove (21).

8. The high-load ball screw with end-recirculation members according to claim 1, wherein There are two circulators (4), and the two circulators (4) are symmetrically arranged on the same side of the nut (2) with the axis of the nut (2) as the center.

9. The high-load ball screw having an end circulating member according to claim 1, wherein The mounting part (41) has a weight-reducing groove (412) on its side wall away from the insertion part (42).

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