Combined ball circulator and lead screw pair with same

Abstract

The utility model relates to the field of linear actuating devices, in particular to a combined ball circulator and a lead screw pair with the same, the lead screw pair comprises a lead screw and a nut, the nut is arranged on the lead screw in a sleeving mode, a circulating ball channel is formed between the nut and the lead screw, and balls are arranged in the circulating ball channel; the combined ball circulator is fixedly arranged at the end part of a nut through a bolt and comprises an upper guide body, a lower guide body and a lower guide body, and a first ball channel is arranged on the upper guide body; the lower guide body is provided with a second ball channel, and the lower guide body and the upper guide body are arranged in a spliced mode; the first ball channel and the second ball channel are encircled to form a reverse ball channel; and the guide ball channel is communicated with the circulating ball channel. The upper guide body and the nut of the combined ball circulator are fixed through the bolt, the upper guide body and the lower guide body are combined together, a complete and closed circulating guide path is provided, and it is guaranteed that balls smoothly pass through the ball rolling path to do infinite circulating motion.

Description

Technical Field

[0001] The present application relates to the field of linear actuating devices, and in particular to a combined ball circulator and a screw pair having the same. Background Art

[0002] Ball screws are essential transmission components in the mechanical field. Ball screws convert rotational motion into linear reciprocating motion. Circulators are important components in ball screws, and their main function is to change the direction of the balls during motion.

[0003] When in use, existing ball screws circulate through the balls within the ball screw nut. A common method is to use an end-plug circulator, which is embedded in the end of the nut to provide guidance for the balls. To secure the circulator, a structure is required at the end of the nut to cover the circulator. Typically, a multi-layered end cap is installed at the end of the nut and then bolted to the end of the nut, pressing the circulator between the nut end and the end cap. This structure can easily cause the circulator to move between the end cap and the nut during operation, resulting in poor circulator stability. Utility Model Content

[0004] The technical problem to be solved by the utility model is that the existing circulator has poor stability when the nut is running.

[0005] To this end, the utility model provides a combined ball circulator and a screw pair having the same.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A combined ball circulator, comprising:

[0008] an upper guide body, wherein a first ball track is provided on the upper guide body;

[0009] A lower guide body, wherein the lower guide body is provided with a second ball track, and the lower guide body is spliced ​​with the upper guide body;

[0010] Wherein, the first ball rolling track and the second ball rolling track are combined to form a return ball rolling track;

[0011] Bolts for mounting the upper guide body are provided on both sides of the upper guide body.

[0012] By adopting the above technical solution, the split circulator structure is less difficult to process, so compared with the existing circulator, the upper guide body, the lower guide body and the nut have higher matching accuracy. When the circulator is in use, the upper guide body of the circulator and the nut are fixed by bolts, and the left and right sides are provided to firmly press the lower guide body between the upper guide body and the nut. The upper guide body and the lower guide body are tightly pressed together, thereby improving the matching degree between the upper and lower guide bodies, so that the ball can roll stably in the return ball track, improving the operation accuracy, and preventing the circulator from being lifted up due to excessive pressure, and preventing the circulator from circumferential movement when the nut is running, thereby reducing the wear between the circulator and the nut, and between the upper guide body and the lower guide body, thereby improving the service life of the circulator.

[0013] Furthermore, the bolts are symmetrically arranged on both sides of the upper guide body.

[0014] Furthermore, a positioning pin is provided on a side of the lower guide body away from the upper guide body.

[0015] Furthermore, the upper guide body is provided with a first abutting surface, and the lower guide body is provided with a second abutting surface that is in contact with the first abutting surface.

[0016] Furthermore, a limiter is connected to the lower guide body, and a limit groove is provided on the limiter. The limit groove is opposite to the portion on the return ball track and forms a guide ball track with a circular cross section.

[0017] By adopting the above technical solution, the limiter guides the ball that escapes from the nut into the return ball channel, and the design on one side can also prevent the ball from falling off when installing the ball.

[0018] Furthermore, the arc radius R of the cross section of the limiting groove is consistent with the arc radius of the thread groove on the nut.

[0019] Furthermore, the arc radius R of the cross section of the limiting groove is greater than the radius of the ball and smaller than the diameter of the ball.

[0020] Furthermore, the ratio of the arc radius R of the cross section of the limiting groove to the diameter of the ball is in the range of 0.54≤(R / Da)≤0.6.

[0021] Furthermore, a guide surface is provided on the end surface of the limiter facing the inlet end of the guide ball path, and the guide surface is inclined toward the guide ball path.

[0022] A screw pair, comprising:

[0023] Lead screw, and

[0024] A nut is sleeved on the lead screw, a circulating ball track is provided between the nut and the lead screw, and balls are provided in the circulating ball track;

[0025] As described above, the combined ball circulator is arranged at the end of the nut, and the guide ball path is connected to the circulating ball path.

[0026] Furthermore, two circulators are provided on the end surface of each nut and are symmetrically arranged around the axis of the nut.

[0027] Furthermore, the end of the nut is provided with a mounting groove for embedding the circulator, and the bottom of the mounting groove is provided with a socket adapted to the positioning pin.

[0028] The beneficial effect of the present invention is that the upper guide body and the nut of the combined ball circulator are fixed by bolts, and the left and right sides are arranged to firmly press the lower guide body between the upper guide body and the nut. The combined ball circulator is arranged separately, so the processing difficulty is relatively small, and the matching accuracy between the upper guide body, the lower guide body and the nut is relatively high. The upper guide body and the lower guide body are tightly pressed together. The two guide bodies are combined together to provide a complete closed circulation guide path, ensuring that the balls can smoothly pass through the ball rolling path to perform infinite circulation motion, thereby improving the matching between the upper and lower guide bodies, so that the balls can stably roll in the return ball channel, and improving the running accuracy.

[0029] At the same time, both sides are fixed with bolts, which can prevent the circulator from being lifted up due to excessive pressure, and prevent the combined ball circulator from circumferential movement when the nut is running, thereby reducing the wear between the combined ball circulator and the nut, and between the upper guide body and the lower guide body, thereby improving the service life of the combined ball circulator.

[0030] The limiter guides the ball that comes out of the nut, and the design on one side can also prevent the ball from falling off when installing the ball. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] Figure 1 It is a structural diagram of the circulator in the utility model.

[0033] Figure 2 It is a structural schematic diagram of the upper guide body in the utility model.

[0034] Figure 3 It is a structural diagram of the lower guide body in the utility model.

[0035] Figure 4It is a schematic diagram of the assembly between the circulator and the nut in the utility model.

[0036] Figure 5 It is a schematic diagram of the positional relationship between the upper guide body and the lower guide body in the utility model.

[0037] In the figure: 1. Upper guide body; 10. First abutment surface; 11. First ball track; 2. Lower guide body; 20. Second abutment surface; 21. Second ball track; 22. Limiter; 23. Limiting groove; 24. Guide ball track; 25. Mounting surface; 26. Positioning pin; 3. Mounting portion; 4. Nut; 5. Spiral ball track; 6. Return ball track. DETAILED DESCRIPTION

[0038] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0040] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0041] Reference Figure 1-3, a combined ball circulator is installed at the end of the nut 4, the combined ball circulator comprises an upper guide body 1, a lower guide body 2 and a mounting portion 3, the upper guide body 1 is provided with a first abutting surface 10, the lower guide body 2 is provided with a second abutting surface 20, the upper guide body 1 is provided with a first ball path 11, and the lower guide body 2 is provided with a second ball path 21, the first abutting surface 10 and the second abutting surface 20 fit closely with each other so that the upper guide body 1 and the lower guide body 2 can be spliced ​​into a whole along the axial direction of the nut 4, and the first ball path 11 and the second ball path 21 are combined to form a return ball path 6, the two guide bodies are combined together, together with the nut 4 and the spiral ball path 5 between the screw rod to provide a complete closed circulation guide path, ensuring that the balls pass smoothly through the ball rolling path to perform infinite circulation motion.

[0042] The upper guide body 1 is provided with two mounting portions 3, each of which is threadedly connected to a bolt. The bolt passes through the mounting portion 3 and is threadedly connected to the nut 4. The bolts are symmetrically arranged on both sides of the upper guide body 1. When the upper guide body 1 and the lower guide body 2 are assembled into a single unit, the mounting portion 3 protrudes from the outer edge of the lower guide body 2 in a plane perpendicular to the axis of the nut 4.

[0043] When installing the circulator, the upper guide body 1 of the circulator is fixed to the nut 4 by bolts, and the left and right sides are provided to firmly press the lower guide body 2 between the upper guide body 1 and the nut 4, while preventing the circulator from being lifted up due to excessive pressure.

[0044] A limiter 22 is connected to the lower guide body 2, and a limit groove 23 is provided on the limiter 22. The limit groove 23 is opposite to the part on the return ball track 6 and forms a guide ball track 24 with a circular cross-section. The limiter 22 guides the balls that escape from the nut 4 into the return ball track 6, and the design on one side can also prevent the balls from falling off when installing them.

[0045] A mounting surface 25 with an arc shape is provided on the side of the limiter 22 away from the return ball path 6. When the limiter 22 is installed on the nut 4, the limiter 22 is embedded in the threaded groove on the screw. The size of the arc radius R of the cross section of the limiter groove 23 is consistent with the size of the cross-sectional radius of the threaded groove on the nut 4. The ratio of the radius R of the limiter groove 23 to the diameter of the ball is in the range of 0.54≤(R / Da)≤0.6, where Da is the diameter of the ball. A guide surface is provided on the end face of the limiter 22 facing the entrance end of the guide ball path 24. The guide surface is inclined toward the guide ball path 24, so that when the ball moves from the spiral ball path 5 toward the guide ball path 24, the ball can be guided into the guide ball path 24 along the inclined guide surface and enter the guide ball path 24 at a certain angle.

[0046] A positioning pin 26 is connected to a side of the lower guide body 2 away from the upper guide body 1 , and the positioning pin 26 is plug-fitted with the nut 4 .

[0047] Reference Figure 4 、 5 A screw pair includes a screw, a nut 4, a ball, and the above-mentioned combined ball circulator. The nut 4 is coaxially sleeved on the screw. The threaded groove on the nut 4 and the threaded groove on the screw form a spiral ball path 5 between the nut 4 and the screw. The ball is located in the spiral ball path 5 and rolls with the nut 4 and the screw.

[0048] The combined ball circulator is arranged at the end of the nut 4, and two combined ball circulators are arranged on each end face of the nut 4. The two combined ball circulators on each end face are symmetrically arranged around the axis center of the nut 4. The end face of the nut 4 is provided with a mounting groove adapted to the combined ball circulator, and the bottom of the mounting groove is provided with a threaded hole and a socket adapted to the positioning pin 26.

[0049] The lower guide body 2 faces the nut 4, and the combined ball circulator is embedded in the installation groove. The positioning pin 26 is inserted in the socket, and the bolt is rotated. The bolt passes through the installation part 3 and is threadedly connected with the nut 4. At this time, the limiter 22 is located in the threaded groove on the screw, and the screw and the nut 4 rotate relative to each other. When the nut 4 moves linearly along the axial direction of the screw, the combined ball circulator is fixed to the end of the nut 4 by the bolt and the positioning pin 26, thereby effectively preventing the combined ball circulator from moving along the circumferential direction of the screw.

[0050] To sum up, when the combined ball circulator is in use, the upper guide body 1 and the nut 4 of the circulator are fixed by bolts, and the left and right sides are provided to firmly press the lower guide body 2 between the upper guide body 1 and the nut 4. The upper guide body 1 and the lower guide body 2 are tightly pressed together. The two guide bodies are combined together to provide a complete closed circulation guide path, ensuring that the balls pass smoothly through the ball rolling path to perform infinite circulation motion, thereby improving the fit between the upper and lower guide bodies 2, so that the balls can roll stably in the return ball path 6, thereby improving the operation accuracy.

[0051] At the same time, both sides are fixed with bolts, which can prevent the circulator from being lifted up due to excessive pressure and prevent the circulator from moving circumferentially when the nut 4 is in operation, thereby reducing the wear between the circulator and the nut 4, and between the upper guide body 1 and the lower guide body 2, thereby increasing the service life of the circulator.

[0052] As the balls roll between the nut 4, the lead screw, and the combined ball circulator, they move out of the nut 4 and are guided along the inclined guide surface into the guide ball path 24, entering the guide ball path 24 at a certain angle. The stopper 22 guides the balls that escape from the nut 4 and is also designed on one side to prevent them from falling out during installation.

[0053] Based on the above-described preferred embodiments of the present invention, and in accordance with the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A combined ball circulator, characterized in that: include, An upper guide body (1), wherein a first ball track (11) is provided on the upper guide body (1); A lower guide body (2), wherein a second ball track (21) is arranged on the lower guide body (2), and the lower guide body (2) is spliced ​​with the upper guide body (1); Wherein, the first ball track (11) and the second ball track (21) are combined to form a return ball track (6); Bolts for mounting the upper guide body (1) are arranged on both sides of the upper guide body (1).

2. The combined ball circulator according to claim 1, characterized in that: The bolts are symmetrically arranged on both sides of the upper guide body (1).

3. The combined ball circulator according to claim 1, characterized in that: A positioning pin (26) is provided on the side of the lower guide body (2) away from the upper guide body (1).

4. The combined ball circulator according to claim 1, characterized in that: The upper guide body (1) is provided with a first abutting surface (10), and the lower guide body (2) is provided with a second abutting surface (20) which is in contact with the first abutting surface (10).

5. The combined ball circulator according to claim 1, characterized in that: The lower guide body (2) is connected to a limiter (22), and a limiter groove (23) is provided on the limiter (22). The limiter groove (23) is opposite to a portion on the return ball track (6) and forms a guide ball track (24) with a circular cross section.

6. The combined ball circulator according to claim 5, characterized in that: The arc radius R of the cross section of the limiting groove (23) is consistent with the arc radius of the thread groove on the nut (4).

7. The combined ball circulator according to claim 5, characterized in that: The arc radius R of the cross section of the limiting groove (23) is greater than the radius of the ball and smaller than the diameter of the ball.

8. The combined ball circulator according to claim 7, characterized in that: The ratio between the arc radius R of the cross section of the limiting groove (23) and the diameter of the ball is in the range of 0.54≤(R / Da)≤0.

6.

9. The combined ball circulator according to claim 5, characterized in that: A guide surface is provided on the end surface of the stopper (22) facing the inlet end of the guide ball track (24), and the guide surface is inclined toward the guide ball track (24).

10. A screw pair, characterized in that: include, Lead screw, and A nut (4), wherein the nut (4) is sleeved on the lead screw, a circulating ball track is provided between the nut (4) and the lead screw, and balls are provided in the circulating ball track; The combined ball circulator as claimed in any one of claims 1 to 9, wherein the combined ball circulator is arranged at the end of the nut (4), and the guide ball path (24) is connected to the circulating ball path.

11. The screw pair according to claim 10, characterized in that: Two circulators are arranged on the end surface of each nut (4) and are symmetrically arranged about the axis center of the nut (4).

12. The screw pair according to claim 10, characterized in that: The end of the nut (4) is provided with a mounting groove for embedding the circulator, and the bottom of the mounting groove is provided with a socket adapted to the positioning pin (26).

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