A closed-end end plug type ball screw pair

Abstract

The utility model relates to the technical field of screw rod, disclose a kind of end plug type ball screw pair of two-end closed type, including screw rod, the bearing is fixedly connected in the both ends of screw rod, the outer wall of screw rod is connected with multiple nuts by screw thread, the inner wall of each nut is provided with multiple steel balls, the inner wall top of each nut is fixedly connected with reverser one, the inner wall bottom of each nut is fixedly connected with reverser two, the one side of each reverser one and reverser two is respectively provided with connecting ring one and connecting ring two, the connecting ring one and connecting ring two are respectively arranged in the inner wall both ends of the nut in each.The utility model in, by setting reverser and passage hole in nut interior, solve the steel ball filling problem of high-precision closed screw rod, significantly simplify assembly process.Meanwhile, the bearing design of the both ends of screw rod guarantees errorless precision installation, and the plugging structure of connecting ring can effectively prevent steel ball from sliding out in operation.

Description

Technical Field

[0001] This utility model relates to the field of ball screws, and in particular to a closed-end end-plug type ball screw assembly. Background Technology

[0002] As a key transmission component for achieving linear motion in machine tools, automated equipment, and other fields, the performance of lead screws directly affects the operating accuracy and stability of the equipment. With the increasing demand for high-precision and high-reliability machining equipment in the manufacturing industry, higher requirements are being placed on the accuracy, load capacity, and service life of lead screws. In particular, optimizing the structure of high-precision enclosed lead screws to improve their overall performance has become a focus of industry attention, especially in the design and application of high-precision enclosed lead screws.

[0003] In traditional lead screw drive systems, ball screw pairs are widely used due to their high precision and high efficiency. Their basic principle involves arranging steel balls between the lead screw and the nut, utilizing the rolling motion of these balls to reduce frictional resistance and achieve relative movement between the lead screw and the nut. To ensure the stability of the lead screw's operation, both ends of the lead screw typically employ a closed-loop design, while the steel balls are inserted one by one through a threaded groove at one end of the lead screw, and their circulatory movement is achieved through a simple channel inside the nut.

[0004] However, this traditional method of filling ball screws has significant drawbacks. Because the screw is closed at both ends, when filling high-precision closed-end screws with ball screws, the ball screws cannot easily enter the circulation track formed by the screw and nut, resulting in a cumbersome and inefficient assembly process, which greatly affects production efficiency and assembly accuracy. Therefore, a closed-end end-plug type ball screw assembly is proposed to solve these problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a closed-end end-plug type ball screw assembly, which aims to improve the problem of the closed ends of the screw. When loading steel balls into a high-precision closed screw, the steel balls have difficulty entering the circulation track formed by the screw and nut, resulting in a cumbersome and inefficient assembly process.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A closed-end end-plug type ball screw assembly includes a lead screw, with bearings fixedly connected to both ends of the lead screw. Multiple nuts are threadedly connected to the outer wall of the lead screw, and multiple steel balls are provided on the inner wall of each nut. A first reverser is fixedly connected to the top of the inner wall of each nut, and a second reverser is fixedly connected to the bottom of the inner wall of each nut. A first connecting ring and a second connecting ring are respectively provided on one side of each first reverser and second reverser.

[0008] As a further description of the above technical solution:

[0009] Each of the first and second connecting rings is respectively disposed at both ends of the inner wall of the nut, and each of the first and second connecting rings is respectively attached to the first and second reversers.

[0010] As a further description of the above technical solution:

[0011] Each nut has an internal channel hole for providing a passage for the steel ball to enter the top inlet of the reverser from the bottom outlet of the reverser one.

[0012] As a further description of the above technical solution:

[0013] The steel balls are in contact with the inner threaded surface of the nut and the outer threaded surface of the screw.

[0014] As a further description of the above technical solution:

[0015] Both ends of the lead screw are circular surfaces, and the diameters of the multiple bearings are smaller than the diameter of the lead screw.

[0016] As a further description of the above technical solution:

[0017] One of the nuts has a connecting plate fixedly connected to its outer wall, and the other adjacent nut is connected and fixed to the connecting plate by screws.

[0018] This utility model has the following beneficial effects:

[0019] In this invention, by incorporating a reversing device and a channel hole inside the nut, the problem of steel ball loading in high-precision enclosed ball screws is solved, significantly simplifying the assembly process. Simultaneously, the bearing design at both ends of the screw ensures error-free precision installation, while the sealing structure of the connecting ring effectively prevents the steel balls from slipping out during operation. The resulting end-plug closed-loop structure further effectively prevents the steel balls from accidentally slipping out during high-speed operation, significantly enhancing the long-term operational reliability and service life of the ball screw pair. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of a closed-end end-plug type ball screw assembly proposed in this utility model;

[0021] Figure 2 A schematic diagram of the structure of a reverser for a closed-end end-plug type ball screw pair proposed in this utility model.

[0022] Figure 3 This is a schematic diagram of the connecting ring structure of a two-end closed end plug type ball screw pair proposed in this utility model;

[0023] Figure 4This is a schematic diagram of the reversing device structure of a two-end closed end plug type ball screw pair proposed in this utility model.

[0024] Legend:

[0025] 1. Lead screw; 2. Bearing; 3. Nut; 4. Connecting plate; 5. Steel ball; 6. Connecting ring one; 7. Reversing device one; 8. Connecting ring two; 9. Reversing device two. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Reference Figures 1-4This utility model provides an embodiment of a closed-end end-plug type ball screw assembly, including a lead screw 1. Bearings 2 are fixedly connected to both ends of the lead screw 1. The bearings 2, with a diameter smaller than that of the lead screw 1, support the lead screw 1 while preventing adjacent components from directly contacting the threaded grooves at both ends of the lead screw 1. This avoids the problem of cross-sections at the contact surface affecting the overall installation accuracy of the machine tool. Multiple nuts 3 are threaded onto the outer wall of the lead screw 1. The nuts 3 cooperate with the lead screw 1 to perform rotational or linear motion, achieving the effect of converting rotational motion into high-precision linear motion. Multiple steel balls 5 are provided on the inner wall of each nut 3. These steel balls 5 roll between the lead screw 1 and the nut 3 with extremely low friction. Transmitting power and motion ensures high efficiency and precision in transmission. Each nut 3 has a reverser 7 fixedly connected to its inner top wall, and a reverser 9 fixedly connected to its inner bottom wall. Reversers 7 and 9 guide the steel balls 5 smoothly from the threaded raceway of the screw 1 into the return channel inside the nut 3, forming a key component in the circulation path of the steel balls 5. Each reverser 7 and 9 has a connecting ring 6 and a connecting ring 8 on one side. These connecting rings seal the openings of reversers 7 and 9 during installation, effectively preventing the steel balls 5 from accidentally slipping out and scattering during loading or operation. Ring 2 8 is respectively set at both ends of the inner wall of nut 3. Each connecting ring 1 6 and connecting ring 2 8 is respectively in contact with reverser 1 7 and reverser 2 9. Each nut 3 has a channel hole inside. This channel hole is used to provide a return path for steel ball 5 independent of the working raceway, ensuring that steel ball 5 can smoothly circulate from one end to the other. The channel hole is used to provide a passage for steel ball 5 to enter the top inlet of reverser 2 9 from the bottom outlet of reverser 1 7. This channel hole, together with reverser 1 7 and reverser 2 9, forms a complete closed loop circulation circuit, achieving the effect of continuous rolling of steel ball 5. Multiple steel balls 5 are in contact with the inner thread surface of nut 3 and the outer thread surface of screw 1. This contact This design allows the steel ball 5 to roll between the two threaded surfaces while bearing the load, achieving high-precision linear transmission with low friction. Both ends of the lead screw 1 are circular surfaces, and the diameters of multiple bearings 2 are smaller than the diameter of the lead screw 1. This structural design ensures the integrity and sealing of the mounting interfaces at both ends of the lead screw 1, providing a prerequisite for solving the problem of difficulty in installing the steel ball 5 into the closed lead screw 1. One of the nuts 3 has a connecting plate 4 fixedly connected to its outer wall, and the other adjacent nut 3 is connected and fixed to the connecting plate 4 by screws. The connecting plate 4 is used to rigidly connect the two independent nuts 3 together, which can be used to eliminate axial clearance or apply preload, thereby improving the rigidity and positioning accuracy of the entire ball screw pair.

[0028] Working principle: During product use, bearings 2 with slightly smaller diameters are installed at both ends of the lead screw 1 to prevent adjacent components from coming into contact with the threaded grooves at both ends of the lead screw 1. This would prevent a break in the contact surface between the adjacent components and the lead screw 1, thus affecting the machine tool installation accuracy. Next, the nut 3 is threaded onto the outer wall of the lead screw 1. Then, the steel ball 5 is poured in through the inlet at the top of the reverser 7. The steel ball 5 enters from the top of the reverser 9 through the internal grooves of the reverser 7 and the nut 3, and then slides out from the outlet on one side of the reverser 9 to the surface of the threaded groove on the outer wall of the lead screw 1. Then, it slides along the outer wall of the lead screw 1. The threaded groove on the wall enters from the inlet on one side of the reverser 7, thus achieving a closed loop for the rolling path of the steel ball 5. Next, connecting ring 6 and connecting ring 8 are installed on one side of the reverser 7 and reverser 9 respectively to prevent the steel ball 5 from accidentally slipping out. Finally, the steel ball 5 is successfully injected while ensuring that both ends of the lead screw 1 are closed. This solves the problem that when injecting the steel ball 5, it is usually necessary to enter through the threaded groove at one end of the lead screw 1. However, in order to ensure the installation accuracy of the machine tool, both ends of the lead screw 1 are set to be closed, which can easily cause the steel ball 5 to fail to be inserted. This improves the insertion effect of the steel ball 5.

[0029] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A type of end-plug ball screw assembly with closed ends, comprising a screw (1), characterized in that: The lead screw (1) is fixedly connected to bearings (2) at both ends. The lead screw (1) is threaded with multiple nuts (3). Each nut (3) has multiple steel balls (5) on its inner wall. Each nut (3) has a reverser I (7) fixedly connected to the top of its inner wall. Each nut (3) has a reverser II (9) fixedly connected to the bottom of its inner wall. Each reverser I (7) and reverser II (9) has a connecting ring I (6) and a connecting ring II (8) on one side.

2. The end-plug type ball screw assembly with closed ends according to claim 1, characterized in that: Each of the first connecting ring (6) and the second connecting ring (8) is respectively disposed at both ends of the inner wall of the nut (3), and each of the first connecting ring (6) and the second connecting ring (8) is respectively attached to the first reverser (7) and the second reverser (9).

3. The end-plug type ball screw assembly with closed ends according to claim 1, characterized in that: Each of the nuts (3) has a channel hole inside, which provides a passage for the steel ball (5) to enter the top inlet of the reverser (9) from the bottom outlet of the reverser one (7).

4. The end-plug type ball screw assembly with closed ends according to claim 1, characterized in that: Multiple steel balls (5) are in contact with the inner threaded surface of the nut (3) and the outer threaded surface of the screw (1).

5. The end-plug type ball screw assembly with closed ends according to claim 1, characterized in that: Both ends of the lead screw (1) are circular surfaces, and the diameters of the multiple bearings (2) are smaller than the diameter of the lead screw (1).

6. The end-plug type ball screw assembly with closed ends according to claim 1, characterized in that: One of the nuts (3) is fixedly connected to a connecting plate (4) on its outer wall, and the other adjacent nut (3) is connected and fixed to the connecting plate (4) by screws.

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