Internal circulation type ball screw

Abstract

The utility model relates to the technical field of ball screws, and discloses an internal circulation type ball screw which comprises a screw body, a sleeve is arranged on the outer wall of the screw body in a sleeved mode, and a connecting assembly is arranged in the sleeve. The connecting structure comprises a nut, the nut is arranged in the sleeve in a penetrating mode, a limiting groove is formed in the nut, a circulating groove is formed in the nut, a steel ball is arranged in the nut, the steel ball is embedded into the limiting groove and the circulating groove, the steel ball is connected into the screw in a sliding mode, and a fixing assembly is arranged between the sleeve and the nut. According to the utility model, the inner hexagon screw is screwed into the sleeve to abut against the outer wall of the nut to fix the sleeve and the nut, and the steel ball can circularly move in the nut through the limiting groove and the circulating groove, so that the effects of internal circulation of the steel ball and convenience in installation of the screw and the nut are achieved, and the problem that the steel ball of the ball screw rotates at a fixed position and is easy to block is solved; and the practicability of the ball screw is improved.

Description

Technical Field

[0001] This utility model relates to the field of ball screw technology, and in particular to an internal circulation ball screw. Background Technology

[0002] In automated equipment, CNC machine tools, and precision transmission mechanisms, ball screws are widely used in linear displacement control systems due to their advantages such as high efficiency, low friction, and high positioning accuracy. Especially in working scenarios with high load requirements and controllable stroke, ball screws offer superior transmission performance compared to traditional sliding screws. However, with the continuous improvement of precision and stability requirements in industrial equipment, the structural optimization and assembly methods of ball screws urgently need further improvement to enhance their overall service life and ease of assembly.

[0003] Most existing ball screws employ an external circulation structure, where the balls circulate back between the nut and the screw via an external circulation pipe. A guide block or circulation pipe is located outside the nut to complete the ball circulation path. During installation, the balls must be inserted into the nut through a pre-set channel, ensuring the circulation channel remains unobstructed to prevent the balls from jamming or falling out. Some structures also require threaded connections or retaining rings for installation and fixation to the workpiece. This necessitates additional tools during installation, making the structure relatively complex and susceptible to external environmental factors or operational errors, potentially leading to assembly instability or functional limitations.

[0004] However, existing ball screw structures suffer from the problem of balls repeatedly rolling in a fixed position without effective circulation. Particularly under certain operating conditions, the balls are prone to localized jamming, leading to decreased transmission efficiency, increased operating noise, and even complete seizure, thus affecting the overall reliability and service life of the mechanism. Furthermore, the connection between existing ball screws and workpieces largely relies on traditional thread tightening methods, resulting in cumbersome installation processes requiring tools and lacking efficient quick assembly mechanisms, leading to low installation and maintenance efficiency. Therefore, there is an urgent need for a ball screw with an internal circulation structure that is easy to install, to effectively improve the stability of ball operation and ease of assembly. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides an internal circulation ball screw, which aims to improve the problem that the steel balls in the ball screw are prone to jamming when rotating in a fixed position.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an internal circulation ball screw, including a screw, a sleeve sleeved on the outer wall of the screw, and a connecting component disposed inside the sleeve;

[0007] The connection includes a nut, which is inserted inside a sleeve. The nut has a limiting groove and a circulation groove inside. A steel ball is disposed inside the nut and is fitted with the limiting groove and the circulation groove. The steel ball is slidably connected inside a screw. A fixing component is disposed between the sleeve and the nut.

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

[0009] The fixing component includes an internal hexagon screw, which is threaded into the inside of the sleeve, with one end of the internal hexagon screw abutting against the outer wall of the nut.

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

[0011] A connecting plate is fixedly connected to one end of the sleeve, and an installation pin is inserted inside the connecting plate.

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

[0013] The mounting pin is fixedly connected to a limiting ring on its outer wall, and one side of the limiting ring is in contact with the outer wall of the connecting plate.

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

[0015] The mounting pin is internally threaded with a bolt, and a knob is fixedly connected to one end of the bolt.

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

[0017] The other end of the bolt is fixedly connected to a tapered column, which is slidably connected inside the mounting pin.

[0018] As a further description of the above technical solution:

[0019] The mounting pin has locking balls arranged in a circular array inside.

[0020] As a further description of the above technical solution:

[0021] The outer wall of the cone-shaped column abuts against the locking ball.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, firstly, the internal hexagonal screw is screwed into the sleeve so that it abuts against the outer wall of the nut to fix the sleeve and the nut. Then, the nut is screwed onto the outer wall of the screw through the steel ball. When the sleeve moves on the outer wall of the screw, the steel ball can circulate within the nut through the limiting groove and the circulation groove, achieving the effect of internal circulation of the steel ball and facilitating the installation of the screw and nut. This solves the problem that the steel ball of the ball screw is prone to jamming when rotating in a fixed position, and improves the practicality of the ball screw.

[0024] 2. In this utility model, the mounting pin is limited on the other side of the connecting plate by a limiting ring. Then, the bolt is rotated by a knob, and the bolt drives the conical column to extend into the mounting pin. Then, the outer wall of the conical column abuts against the locking ball, which achieves the effect of easy combination with the workpiece. This solves the problem that the ball screw needs to be installed with a tool and screw when installing it with the workpiece, and improves the installation convenience of the ball screw. Attached Figure Description

[0025] Figure 1 This is a perspective view of an internal circulation ball screw proposed in this utility model;

[0026] Figure 2 This is a schematic diagram of the internal structure of the sleeve of an internal circulation ball screw proposed in this utility model;

[0027] Figure 3 A schematic diagram of the steel ball structure of an internal circulation ball screw proposed in this utility model;

[0028] Figure 4 This is a schematic diagram of the internal structure of the nut in an internal circulation ball screw proposed in this utility model.

[0029] Figure 5 This is a schematic diagram of the internal structure of the mounting pin of an internal circulation ball screw proposed in this utility model.

[0030] Legend:

[0031] 1. Screw; 2. Connecting plate; 3. Sleeve; 4. Socket head screw; 5. Nut; 6. Steel ball; 7. Limit groove; 8. Circulation groove; 9. Mounting pin; 10. Limit ring; 11. Bolt; 12. Knob; 13. Tapered column; 14. Locking ball. Detailed Implementation

[0032] 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.

[0033] Reference Figures 1-4 The present invention provides an embodiment of an internal circulation ball screw, including a screw 1, a sleeve 3 sleeved on the outer wall of the screw 1, the sleeve 3 being used to form a stable support structure to constrain the installation position of the connecting component, and a connecting component being provided inside the sleeve 3;

[0034] The connecting assembly includes a nut 5, which passes inside the sleeve 3 and serves to connect the transmission structure and guide the movement of the balls. A limiting groove 7 is formed inside the nut 5 to limit the radial movement range of the steel balls 6, preventing them from detaching or becoming unstable. A circulation groove 8 is also formed inside the nut 5, communicating with the limiting groove 7 to guide the steel balls 6 to achieve a closed-loop internal circulation path. The steel balls 6 are housed inside the nut 5, engaging with the limiting groove 7 and the circulation groove 8, thus forming a rolling friction pair between the screw 1 and the nut 5, reducing operating friction resistance and improving transmission efficiency. The sliding connection inside the screw 1 allows the steel ball 6 to roll in the spiral groove of the screw 1 and complete self-circulation in the circulation structure. A fixing component is provided between the sleeve 3 and the nut 5 to prevent the nut 5 from being displaced axially or in the rotational direction within the sleeve 3, ensuring structural stability. The fixing component includes an internal hexagon screw 4, which is threaded inside the sleeve 3 for easy adjustment and locking by screwing. One end of the internal hexagon screw 4 abuts against the outer wall of the nut 5, fixing the nut 5 inside the sleeve 3 by axial compression to prevent the nut 5 from loosening or shifting during operation.

[0035] Reference Figure 5 One end of the sleeve 3 is fixedly connected to a connecting plate 2. The connecting plate 2 is used for fixed connection with external equipment or structural components to realize the overall installation and positioning function of this device. An installation pin 9 is inserted inside the connecting plate 2. The installation pin 9 is used as a plug-in component in the connecting mechanism to realize quick assembly and disassembly with the mating components. A limit ring 10 is fixedly connected to the outer wall of the installation pin 9. The limit ring 10 plays a role in limiting the axial movement range of the installation pin 9 and preventing axial slippage during operation. One side of the limit ring 10 is in contact with the outer wall of the connecting plate 2. The surface contact enhances the stability of the installation position. A bolt 11 is threaded inside the installation pin 9. The bolt 11 is used to drive the internal components of the installation pin 9 to move axially to realize the locking and releasing function. One end of the bolt 11 is fixed. A knob 12 is connected, which facilitates manual operation to apply rotational driving force and improves the ease of operation of the structure. The other end of the bolt 11 is fixedly connected to a conical column 13. The conical column 13 serves as a force transmission component to convert rotational motion into axial thrust, thereby working in conjunction with the locking structure. The conical column 13 is slidably connected inside the mounting pin 9, allowing it to smoothly advance axially under rotational drive, improving assembly accuracy. The mounting pin 9 is equipped with locking balls 14 arranged in a ring array. The locking balls 14 serve as limiting elements and can expand outward under the action of the conical column 13, thereby engaging with the inner wall of the mating hole to achieve locking. The outer wall of the conical column 13 abuts against the locking balls 14, and the conical surface of the conical column 13 propels the locking balls 14 to move radially, completing the rapid locking of the workpiece or device and ensuring connection reliability.

[0036] Working principle: When using this internal circulation ball screw, firstly, the steel ball 6 is embedded in the limiting groove 7 and the circulation groove 8. Then, the sleeve 3 is placed on the outer wall of the nut 5, and the internal hex screw 4 is screwed into the sleeve 3 so that it abuts against the outer wall of the nut 5 to fix the sleeve 3 and the nut 5. Then, the nut 5 is screwed onto the outer wall of the screw 1 through the steel ball 6. When the sleeve 3 moves on the outer wall of the screw 1, the steel ball 6 can circulate within the nut 5 through the limiting groove 7 and the circulation groove 8, achieving the effect of internal circulation of the steel ball 6 and facilitating the installation of the screw 1 and the nut 5.

[0037] When installing the sleeve 3 onto the workpiece, first, the sleeve 3 is attached to one side of the workpiece through the connecting plate 2. Then, the mounting pin 9 is inserted into the workpiece after passing through the connecting plate 2. The mounting pin 9 is then limited on the other side of the connecting plate 2 by the limiting ring 10. Then, the bolt 11 is rotated by the knob 12. The bolt 11 drives the conical column 13 to extend into the interior of the mounting pin 9. Then, the outer wall of the conical column 13 abuts against the locking ball 14, so that the locking ball 14 is embedded in the workpiece for locking, thus achieving the effect of easy assembly with the workpiece.

[0038] 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. An internally cycled ball screw comprising a screw (1), characterized in that: The outer wall of the screw rod (1) is sleeved with a sleeve (3), and the inside of the sleeve (3) is provided with a connecting assembly; The connecting assembly comprises a nut (5) which is arranged in the inside of the sleeve (3), a limiting groove (7) is formed in the inside of the nut (5), a circulating groove (8) is formed in the inside of the nut (5), a steel ball (6) is arranged in the inside of the nut (5), the steel ball (6) is embedded in the limiting groove (7) and the circulating groove (8), the steel ball (6) is slidably connected in the inside of the screw rod (1), and a fixing assembly is arranged between the sleeve (3) and the nut (5).

2. The internally cycled ball screw as set forth in claim 1, wherein: The fixing assembly comprises an internal hexagonal screw (4) which is threadedly connected in the inside of the sleeve (3), and one end of the internal hexagonal screw (4) abuts against the outer wall of the nut (5).

3. The internally cycled ball screw of claim 1, wherein: One end of the sleeve (3) is fixedly connected with a connecting plate (2), and the inside of the connecting plate (2) is penetrated by an installation pin (9).

4. The internally cycled ball screw as set forth in claim 3, wherein: The outer wall of the installation pin (9) is fixedly connected with a limiting ring (10), and one side of the limiting ring (10) is attached to the outer wall of the connecting plate (2).

5. The internally cycled ball screw as set forth in claim 3, wherein: The inside of the installation pin (9) is threadedly connected with a bolt (11), and one end of the bolt (11) is fixedly connected with a knob (12).

6. The internally cycled ball screw as set forth in claim 5, wherein: The other end of the bolt (11) is fixedly connected with a tapered column (13), and the tapered column (13) is slidably connected in the inside of the installation pin (9).

7. The internally cycled ball screw as set forth in claim 3, wherein: The inside of the installation pin (9) is provided with a plurality of locking balls (14) arranged in an annular array.

8. The internally cycled ball screw as set forth in claim 6, wherein: The outer wall of the tapered column (13) abuts against the locking balls (14).

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