High-speed ball screw with end circulator

Abstract

This application relates to the field of linear actuator technology, and more particularly to a high-speed ball screw with an end circulator. A nut is fitted onto the screw body, and a mounting groove is provided on the nut. The circulator comprises: a mounting part with an abutment surface; a support surface abutting the abutment surface within the mounting groove; an insertion part and a lip connected to the mounting part; return channels on the insertion part and the lip; the return channels connecting to a helical channel to form a circulating raceway for ball circulation; and support ribs between the lip and the insertion part, with gaps between the support ribs and their corresponding supports. This application provides a gap between the side wall of the mounting part and the mounting groove, allowing for fine-tuning of the circulator's position before fixed installation, thus reducing the machining precision required for the mounting groove. By providing two layers of support ribs between the insertion part and the lip, the rigidity and strength of the insertion part and the lip are enhanced, improving the service life of the circulator.

Description

Technical Field

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

[0002] A ball screw is a mechanical component that converts rotary motion into linear motion. It has a through hole running axially through the nut, and a circulator mounting groove is machined on the end face of the nut. The ball screw nut's load-bearing rolling groove connects to the circulator's raceway and the through hole, forming a closed circulation path for the rolling elements. At high speeds, the rolling steel balls impact the raceway surface of the circulation section, leading to a decrease in the lifespan of the end circulator. Utility Model Content

[0003] The technical problem to be solved by this invention is that the rolling steel balls impact the raceway surface of the circulation section at high speeds, which leads to a decrease in the lifespan of the end circulator.

[0004] Therefore, this utility model provides a high-speed ball screw with an end circulator.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A high-speed ball screw with an end recirculator includes,

[0007] The system comprises a lead screw body, a nut, a circulator, and ball bearings. The nut is fitted onto the lead screw body, and a helical groove is formed between the nut and the lead screw body. The nut has a mounting groove for mounting the circulator. The circulator comprises...

[0008] The mounting part has an abutting surface and a supporting surface is provided in the mounting groove, and the abutting surface and the supporting surface abut against each other.

[0009] An insertion part is connected to the abutment surface of the mounting part;

[0010] The lip is connected to the abutment surface of the mounting part. The insertion part and the lip are provided with a return channel, which connects with the spiral channel to form a circulating raceway. The ball is located in the circulating raceway and rolls back and forth. A support part is provided between the lip and the insertion part. The mounting groove is provided with a support groove that matches the support part. A gap is provided between the side wall of the support part away from the mounting part and the corresponding support groove.

[0011] Furthermore, a gap is provided between the end of the insertion part away from the mounting part and the mounting groove.

[0012] Furthermore, the support portion includes a first support rib and a second support rib. The mounting groove is provided with a first support groove adapted to the first support rib, and the mounting groove is provided with a second support groove adapted to the second support rib. The first support rib is connected between the insertion portion and the lip portion, and the second support rib is disposed on the side of the first support rib near the insertion portion and connected to the insertion portion.

[0013] Furthermore, a gap is provided between the side wall of the first support rib away from the mounting part and the first support groove, and a gap is provided between the side wall of the second support rib away from the mounting part and the second support groove.

[0014] Furthermore, an arc-shaped protrusion is provided on the outer side wall of the mounting part, and an anti-rotation groove adapted to the arc-shaped protrusion is provided on the side wall of the mounting groove.

[0015] Furthermore, there is a gap between the side wall of the mounting part and the inner wall of the mounting groove.

[0016] Furthermore, the mounting part is fixedly connected by bolts and nuts.

[0017] Furthermore, a pressure cap is connected to the end of the nut, the pressure cap presses the circulator into the mounting groove, and an elastic body is provided on the side of the pressure cap facing the circulator.

[0018] Furthermore, there is a gap between the end face of the mounting portion away from the insertion portion and the pressure cap.

[0019] The beneficial effect of this utility model is that by setting two layers of support ribs between the insertion part and the lip, and providing a margin between the support ribs and the mounting groove, the rigidity and strength of the insertion part and the lip are enhanced, and a margin is provided for the deformation caused by the rolling element impacting the insertion part and the lip, thereby improving the life of the end circulator.

[0020] Furthermore, this application provides a margin around the mounting part and between it and the mounting groove, and provides an axial margin between the mounting part and the gland, and between the support rib and the support groove, so that the circulator can move and adjust its position within the mounting groove, thus avoiding high-precision machining of this part.

[0021] A screw is installed near the tail fin of the circulator to achieve axial positioning. When the ball screw is running, the steel balls impact the head of the circulator, causing the head to move axially and impact the elastic body of the gland seal, thus buffering and reducing the impact force and extending the service life of the end circulator.

[0022] Furthermore, by rigidly connecting the circulator to the nut with bolts, displacement or vibration of the circulator during operation can be effectively prevented, making it particularly suitable for scenarios requiring high precision and low noise. 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 the high-speed ball screw with an end circulator in this utility model.

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

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

[0027] Figure 4 This is a schematic diagram of the structure of the first gap between the mounting part and the nut in this utility model.

[0028] Figure 5 This is a schematic diagram of the structure of the second gap between the mounting part and the pressure cover in this utility model.

[0029] Figure 6 This is a schematic diagram of the circulator and nut mounting structure in this utility model.

[0030] Figure 7 This is a schematic diagram of the third gap in this utility model.

[0031] Figure 8 This is a schematic diagram of the fourth gap in this utility model.

[0032] In the diagram: 1. Lead screw body; 2. Nut; 21. Mounting groove; 211. Support surface; 212. Slot; 213. Stepped surface; 214. First support groove; 215. Second support groove; 216. Anti-rotation groove; 3. Pressure cap; 4. Circulator; 41. Mounting part; 42. Insertion part; 43. Lip; 44. First support rib; 45. Second support rib; 46. Arc-shaped protrusion. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] A high-speed ball screw with an end circulator 4 is provided. The circulator 4 is disposed at the end of the nut 2 in the ball screw. The ball screw includes a screw body 1, a nut 2, a pressure cap 3, and balls. The nut 2 is sleeved on the screw body 1, and a helical channel is formed between the nut 2 and the screw body 1. The circulator 4 is provided with a return channel, which connects with the helical channel to form a circulating raceway. The balls are located in the circulating raceway and roll back and forth.

[0037] The end of the nut 2 is provided with a mounting groove 21 for installing the circulator 4. The mounting groove 21 is connected to a portion of the spiral groove on the nut 2. The circulator 4 is located in the mounting groove 21 and is fixed to the end of the nut 2 with bolts. The pressure cap 3 is placed on the end of the nut 2 and presses the circulator 4 into the mounting groove 21.

[0038] 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 channel. When the ball passes through the return channel, 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.

[0039] 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, an arc-shaped protrusion can be provided on the outer side wall of the mounting part 41. The arc-shaped protrusion is integrally formed with the mounting part 41. An anti-rotation groove 216 adapted to the arc-shaped 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 50μm 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.

[0040] When the rolling element impacts the circulator 4, because the circulator 4 is made of resin, it deforms to a certain extent within a certain range. After the circulator 4 is installed in the mounting groove 21, a second gap g2 exists between the pressure cap 3 and the side wall of the mounting part 41 away from the insertion part 42. 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.

[0041] Through the first gap g1 and the second gap g2, axial and radial installation allowances are set in the mounting groove 21. The circulator 4 can be moved to the correct position and fixed in the mounting groove 21. A gap is left between the circulator 4 and the pressure plate 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.

[0042] This structure is suitable for high-speed ball screws. In this structure, the balls roll at high speeds, resulting in significant impact on the circulator 4, thus requiring high structural rigidity. The support portion specifically includes a first support rib 44 and a second support rib 45. The first support rib 44 connects the insertion portion 42 and the lip 43, while the second support rib 45 is located on the side of the first support rib 44 closest to the insertion portion 42 and connects to it. The first support rib 44 enhances the rigidity and strength of the lip 43, and the second support rib 45 enhances the rigidity and strength of the insertion portion 42. The mounting groove 21 contains a first support groove 214 and a second support groove 215, corresponding to the first support rib 44 and the second support rib 45, respectively. A third gap g3 is provided between each of the two support wheels and its corresponding support groove. Specifically, there is a gap between the sidewall of the first support rib 44 away from the mounting portion 41 and the first support groove 214, and a gap between the sidewall of the second support rib 45 away from the mounting portion 41 and the second support groove 215.

[0043] Furthermore, the portion of the mounting groove 21 that is adapted to the insertion part 42 is defined as the slot 212. The slot 212 is connected to the groove on the nut 2. A stepped surface 213 is provided between the groove on the nut 2 and the slot 212. 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. In order to allow for the rolling element to impact the insertion part 42 when it passes through the return curved surface on the insertion part 42, a fifth gap g5 is provided between the side wall of the insertion part 42 away from its return curved surface and the slot 212.

[0044] This application allows the circulator 4 to sit within the mounting groove 21 by cooperating with the support surface 211 on the mounting groove 21 and the contact surface on the circulator 4. The installation allowance between the side walls of each component on the circulator 4 and the side wall of the mounting groove 21 allows the circulator 4 to move and adjust its position within the mounting groove 21, avoiding high-precision machining of this part and providing allowance for the deformation of the circulator 4 caused by the impact of the rolling element.

[0045] Then, the circulator 4 is rigidly connected to the nut 2 by bolts. The circulator 4 is installed with bolts near the tail fin to achieve axial positioning, which can effectively prevent the circulator 4 from displacing or vibrating during the movement. It is especially suitable for scenarios with high precision and low noise requirements.

[0046] When the ball screw is running, the steel balls impact the head of the circulator 4. The axial movement of the circulator 4 impacts the gland 3. The gland 3 can be set as an elastic body to buffer and reduce the impact force, thus extending the service life of the end circulator 4.

[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-speed ball screw with an end circulator, comprising, The screw body (1), nut (2), circulator (4) and ball bearings are provided. The nut (2) is sleeved on the screw body (1). A spiral groove is formed between the nut (2) and the screw body (1). The nut (2) is provided with a mounting groove (21) for mounting the circulator (4). Its features are, The circulator (4) includes, The mounting part (41) is provided with an abutting surface, and the mounting groove (21) is provided with a supporting surface (211), and the abutting surface and the supporting surface (211) abut against each other; 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. The return channel and the spiral channel are connected to form a circulating raceway. The ball is located in the circulating raceway and rolls back and forth. A support part is provided between the lip (43) and the insertion part (42). A support groove adapted to the support part is provided on the mounting groove (21). A gap is provided between the side wall of the support part away from the mounting part (41) and the corresponding support groove.

2. The high-speed ball screw with an end circulator according to claim 1, characterized in that, A gap is provided between the end of the insertion part (42) away from the mounting part (41) and the mounting groove (21).

3. The high-speed ball screw with an end circulator according to claim 2, characterized in that, The support portion includes a first support rib (44) and a second support rib (45). The mounting groove (21) is provided with a first support groove (214) adapted to the first support rib (44) and a second support groove (215) adapted to the second support rib (45). The first support rib (44) is connected between the insertion portion (42) and the lip portion (43). The second support rib (45) is disposed on the side of the first support rib (44) near the insertion portion (42) and is connected to the insertion portion (42).

4. The high-speed ball screw with an end circulator according to claim 3, characterized in that, A gap is provided between the side wall of the first support rib (44) away from the mounting part (41) and the first support groove (214), and a gap is provided between the side wall of the second support rib (45) away from the mounting part (41) and the second support groove (215).

5. The high-speed ball screw with an end circulator according to claim 1, characterized in that, An arc-shaped protrusion is provided on the outer side wall of the mounting part (41), and an anti-rotation groove (216) adapted to the arc-shaped protrusion is provided on the side wall of the mounting groove (21).

6. The high-speed ball screw with an end circulator according to claim 5, characterized in that, There is a gap between the side wall of the mounting part (41) and the inner wall of the mounting groove (21).

7. The high-speed ball screw with an end circulator according to claim 1, characterized in that, The mounting part (41) is fixedly connected to the nut (2) by screws.

8. The high-speed ball screw with an end circulator according to claim 1, characterized in that, The end of the nut (2) is connected to a pressure cap (3), which presses the circulator (4) into the mounting groove (21). An elastic body is provided on the side of the pressure cap (3) facing the circulator (4).

9. The high-speed ball screw with an end circulator according to claim 8, characterized in that, There is a gap between the end face of the mounting part (41) away from the insertion part (42) and the cover (3).

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