Ball screw pair with circulator embedded in outer circle of ball screw

Abstract

The utility model relates to the technical field of ball screws, in particular to a ball screw pair with a circulator embedded in the outer circle of a ball screw. Comprising a ball screw, a screw nut and balls. A ball circulator is embedded in the outer circle of the ball screw; a spiral ball raceway is arranged on the ball screw; a nut ball raceway is arranged on the screw nut, and the nut ball raceway is matched with the spiral ball raceway; the ball circulator is provided with a ball raceway, and the ball raceway is connected with two adjacent raceways of the spiral ball raceway and two raceway structures corresponding to the spiral ball raceway in a crossing manner, so that the occupied space of the ball screw pair on functional parts such as a micro electric cylinder and a power sliding table can be greatly reduced; the transmission efficiency of the miniature functional part is improved, and the effect of linear motion of the ball screw is achieved through rotation of the nut.

Description

Technical Field

[0001] The utility model relates to the technical field of ball screws, in particular to a ball screw pair with a circulator embedded in the outer circle of the ball screw. Background Art

[0002] In the prior art, as a precision transmission component, the ball screw pair is widely used in various mechanical devices. Its ball circulator, as a key component, mainly undertakes the task of guiding the balls to circulate between the ball screw and the nut. Traditionally, most of these ball circulators are designed and installed on the nut to meet different specifications and complexity requirements of transmission. Specifically, the external circulation duct type, the internal circulation type, and the end cap type are three common ball circulator structures.

[0003] The external circulation duct type structure guides the balls from one end of the nut to the other end through an external duct. Although this design is flexible, it will significantly increase the overall volume and complexity in miniaturized applications, which is not conducive to the realization of space compactness and function integration. The internal circulation type realizes the circulation of the balls by designing complex raceways inside the nut. Although it reduces the external components, the precision machining requirements for the internal structure are extremely high, and the cost also increases accordingly. Moreover, for a miniaturized ball screw pair, the internal space is limited, and the design difficulty is extremely high. The end cap type structure uses special structures at both ends of the nut to guide the balls, but in the process of miniaturization, the manufacturing precision and stability of this structure face huge challenges.

[0004] In high-precision and small-volume functional components such as micro and small electric cylinders and power slides, higher requirements are put forward for the miniaturization, lightweight, and high performance of the ball screw pair. Due to defects such as large volume, complex structure, and high processing difficulty of the traditional ball circulator structure, its inadaptability gradually becomes apparent. These miniaturized application scenarios require a more compact, efficient, and easy-to-manufacture ball circulation solution. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a ball screw pair with a circulator embedded in the outer circle of the ball screw aiming at the defects existing in the prior art, so as to greatly reduce the occupied space of the ball screw pair on functional components such as micro and small electric cylinders and power slides, improve the transmission efficiency of the micro functional components, and realize the linear motion of the ball screw through the rotation of the nut.

[0006] To achieve the above object, the technical solution adopted by the present utility model is: a ball screw pair with a recirculator embedded in the outer circle of the ball screw, including a ball screw, a screw nut, and balls; a ball recirculator is embedded on the outer circle of the ball screw; a spiral ball raceway is provided on the ball screw; a nut ball raceway is provided on the screw nut, and the nut ball raceway is opposed to the spiral ball raceway; a ball raceway is provided on the ball recirculator, and the ball raceway spans and connects two adjacent raceways of the spiral ball raceway and two corresponding raceways of the spiral ball raceway, and the rolling paths of the balls on the spiral ball raceway and the nut ball raceway are connected end to end through the ball raceway; the ball raceway cooperates with the spiral ball raceway and the nut ball raceway to form a closed-loop circulation of the balls in a single circle within the ball screw pair, forming a closed channel for the circulating operation of the balls; the reciprocating circulation and rolling of the balls in the closed channel for the circulating operation of the balls cause relative displacement and displacement commutation between the screw nut and the ball screw.

[0007] Further, ball recirculator positioning holes adapted to the shape and size of the ball recirculator are respectively provided on the outer circle of the ball screw, and the ball recirculator positioning holes cooperate with the ball recirculator for embedding.

[0008] Further, a circulator ball raceway is provided on the ball recirculator, and the circulator ball raceway guides the balls to span two adjacent raceways of the spiral ball raceway and two corresponding raceways of the nut ball raceway and form a single-circle closed-loop circulation.

[0009] Further, a positioning block is further provided on the ball recirculator, and the positioning block cooperates with the spiral ball raceway and the nut ball raceway for positioning.

[0010] Further, the positioning block is a spiral ring-shaped positioning block.

[0011] Further, a plurality of ball recirculators are provided, and the ball recirculator positioning holes are adapted to the number of the ball recirculators.

[0012] Further, a push rod is provided on the ball screw, and the push rod is connected to the peripheral device as a force output end.

[0013] A push rod is provided on the ball screw, and the push rod is connected to the peripheral device as a force output end.

[0014] By including a ball screw, a screw nut, and balls; a ball circulator is inlaid on the outer circle of the ball screw; a spiral ball raceway is provided on the ball screw; a nut ball raceway is provided on the screw nut, and the nut ball raceway is engaged with the spiral ball raceway; a ball raceway is provided on the ball circulator, and the ball raceway spans and connects two adjacent raceways of the spiral ball raceway and two corresponding raceways of the spiral ball raceway; the ball raceway cooperates with the spiral ball raceway and the nut ball raceway to form a closed-loop circulation of the balls in a single circle within the ball screw pair, forming a closed channel for the balls to circulate and run; the reciprocating circular rolling of the balls in the closed channel for the ball circulation and operation causes relative displacement and displacement commutation between the screw nut and the ball screw, achieving a significant reduction in the occupied space of the ball screw pair on micro and small electric cylinders, power slides and other functional components, improving the transmission efficiency of the micro functional components, and realizing the linear motion of the ball screw through the rotation of the nut. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a three-dimensional perspective view of the ball screw pair assembly in the embodiment of the present invention;

[0017] Figure 2 It is a three-dimensional perspective view of the structure after removing the nut in the embodiment of the present invention;

[0018] Figure 3 It is the front view of the ball screw in the embodiment of the present invention;

[0019] Figure 4 It is the right top view of the ball screw in the embodiment of the present invention;

[0020] Figure 5 It is the top view of the ball screw in the embodiment of the present invention;

[0021] Figure 6 It is a three-dimensional perspective view of the ball screw in the embodiment of the present invention;

[0022] Figure 7 It is a three-dimensional perspective view of the screw nut in the embodiment of the present invention;

[0023] Figure 8This is the front view of the ball circulator in the embodiment of the present utility model;

[0024] Figure 9 This is the left view of the ball circulator in the embodiment of the present utility model;

[0025] Figure 10 This is the top view of the ball circulator in the embodiment of the present utility model;

[0026] Figure 11 This is the three - dimensional perspective view of the ball circulator in the embodiment of the present utility model;

[0027] Figure 12 This is the three - dimensional perspective view of the push rod in the embodiment of the present utility model. Reference numerals:

[0028] Ball screw 1, spiral ball raceway 11, ball circulator positioning hole 12, ball screw positioning groove 13, ball screw positioning hole 14, lead screw nut 2, nut ball raceway 21, ball raceway 31, positioning block 32, ball 4, push rod 5. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0030] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0031] A ball screw pair with a circulator embedded in the outer circle of the ball screw, as Figure 1 、 2As shown in FIGS. 7 and 12, it includes a ball screw 1, a screw nut 2, and balls 4; a ball circulator 3 is inlaid on the outer circle of the ball screw 1; a spiral ball raceway 11 is provided on the ball screw 1; a nut ball raceway 21 is provided on the screw nut 2, and the nut ball raceway 21 is in alignment with the spiral ball raceway 11; a ball raceway 31 is provided on the ball circulator 3, and the ball raceway 31 spans and connects two adjacent raceways of the spiral ball raceway 11 and two corresponding raceways of the nut ball raceway 21, and the rolling paths of the balls 4 on the spiral ball raceway 11 and the nut ball raceway 21 are connected end to end through the ball raceway 31; the ball raceway 31 cooperates with the spiral ball raceway 11 and the nut ball raceway 21 to form a closed-loop circulation for the single-loop closed return of the balls 4 within the ball screw pair, forming a closed channel for the circulating operation of the balls; the reciprocating circulating rolling of the balls 4 in the closed channel for the circulating operation of the balls causes relative displacement and displacement commutation between the screw nut 2 and the ball screw 1.

[0032] Specifically, by directly inlaying the ball circulator 3 on the outer circle of the ball screw 1, compared with the traditional design, this innovative layout greatly saves internal space. Especially for applications such as micro electric cylinders and power slides with limited space, this design makes the overall size of the ball screw pair more compact, meeting the miniaturization requirements. At the same time, by placing the ball circulator 3 outside the ball screw, the design of the ball circulation path is simplified, reducing the processing difficulty and cost. The balls 4 reciprocally roll in the single-loop closed return closed-loop circulation jointly formed by the ball raceway 31, the spiral ball raceway 11, and 21, reducing the friction and wear between the balls and the raceways, and improving the transmission efficiency. At the same time, the closed circulation path ensures the stability and predictability of the ball movement, further improving the transmission accuracy. The close combination of the ball circulator 3 and the ball screw 1 enhances the overall rigidity and stability of the system, reducing the performance fluctuations and failure risks caused by vibration and impact. In addition, the closed ball circulation path also reduces the chance of external impurities entering the raceway, extending the service life of the ball screw pair.

[0033] As a preference of the above embodiment, as Figure 5 、 6 、7 shown, ball circulator positioning holes 12 adapted to the shape and size of the ball circulator 3 are respectively provided on the outer circle of the ball screw 1, and the ball circulator positioning holes 12 cooperate with the ball circulator 3 for inlaying.

[0034] Specifically, the shape and size of the positioning hole 12 of the ball circulator are fully adapted to the ball circulator 3, ensuring that the ball circulator 3 can be accurately embedded on the outer circle of the ball screw 1. The tight fit also restricts the movement and rotation of the ball circulator 3, thus ensuring its stability and reliability during operation. Due to the existence of the positioning hole 12 of the ball circulator, the assembly process of the ball circulator 3 becomes simple and fast. The stable installation of the ball circulator 3 reduces the noise and wear caused by vibration. During the operation of the ball screw pair, the vibration and noise generated when the balls roll in the raceways can be effectively suppressed, thereby improving the running smoothness of the equipment and the comfort of the working environment.

[0035] As a preference of the above embodiment, as Figure 9 , 11 shown, a circulator ball raceway 31 is provided on the ball circulator 3. The circulator ball raceway 31 guides the balls 4 to cross two adjacent raceways of the spiral ball raceway 11 and two corresponding raceways of the nut ball raceway 21 and form a single-loop closed circuit.

[0036] Specifically, through the circulator ball raceway 31, the balls 4 can cross two adjacent raceways of the spiral ball raceway 11 on the ball screw 1 and smoothly transition to two corresponding raceways of the nut ball raceway 21 on the screw nut 2. This cross-connection ensures that the balls form a single-loop closed circuit within the ball screw pair, thereby realizing the continuous, stable, and efficient transmission of the balls. The guiding function of the circulator ball raceway 31 not only simplifies the circulation path of the balls but also reduces the friction and energy loss of the balls during circulation. This optimized transmission path makes the movement of the balls within the ball screw pair smoother, further improving the transmission efficiency and accuracy.

[0037] As a preference of the above embodiment, as Figure 11 , 12 shown, a positioning block 32 is further provided on the ball circulator 3. The positioning block 32 cooperates with the spiral ball raceway 11 and the nut ball raceway 21 for positioning.

[0038] Specifically, through the mutual cooperation of the positioning block 32 with the spiral ball raceway 11 and the nut ball raceway 21, an accurate positioning reference is provided for the ball circulator 3, ensuring that the ball circulator can maintain the correct position and attitude during installation and operation, thereby improving the overall positioning accuracy of the ball screw pair. The positioning block 32 not only plays a positioning role but also enhances the connection strength between the ball circulator 3, the ball screw 1, and the screw nut 2 through its physical presence. When the ball screw pair is working, the positioning block can resist loosening and displacement caused by external factors such as vibration and impact, maintaining the stability of the ball circulator.

[0039] As a preference of the above embodiments, as Figure 11 , 12 shown, the positioning block 32 is a spiral ring-shaped positioning block.

[0040] Specifically, through the design of the spiral ring-shaped positioning block, it can fit more closely to the contours of the spiral ball raceways 11 and 21, thereby providing more accurate positioning, reducing the errors caused by inaccurate positioning, improving the overall accuracy of the ball screw pair, and providing continuous and stable support for the ball circulator, helping to resist external vibrations and impacts, and maintaining the stability of the ball circulator during operation.

[0041] As a preference of the above embodiments, a plurality of ball circulators 3 are provided, and the ball circulator positioning holes 12 are adapted to the number of the ball circulators 3.

[0042] Specifically, through the provision of a plurality of ball circulators 3, the distribution of the balls in the ball screw pair is made more uniform. This helps to reduce the problem of excessive local stress caused by the concentration of the balls, thereby improving the overall efficiency of the transmission. The uniform distribution of the balls also means that the contact between the balls and the raceways is more uniform, reducing the friction and wear caused by uneven contact, and further improving the transmission efficiency. The provision of a plurality of ball circulators 3 enables the ball screw pair to adapt to different working conditions. By adjusting the number and position of the ball circulators, the distribution and transmission performance of the balls can be optimized to meet specific application requirements. As the application requirements change, the ball screw pair can be expanded or reduced by increasing or decreasing the number of ball circulators to adapt to different transmission requirements and space limitations.

[0043] As a preference of the above embodiments, as Figure 12 shown, a push rod 5 is provided on the ball screw 1, and the push rod 5 is connected to the peripheral device as the force output end.

[0044] Specifically, through the structure that the push rod 5 is provided on the ball screw 1 and the push rod 5 is connected to the peripheral device as the force output end, in a specific scenario, the push rod 5 can be telescoped by driving the ball screw nut 2 or the ball screw 1.

[0045] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A ball screw pair with a circulator embedded in the outer circle of the ball screw, characterized in that: It comprises a ball screw (1), a screw nut (2), and a ball (4); A ball circulator (3) is embedded on the outer circle of the ball screw (1); The ball screw (1) is provided with a spiral ball rolling track (11); The screw nut (2) is provided with a nut ball rolling track (21), and the nut ball rolling track (21) is matched with the spiral ball rolling track (11); The ball circulator (3) is provided with a ball rolling track (31), the ball rolling track (31) spans and connects two adjacent rolling tracks of the spiral ball rolling track (11) and two corresponding rolling tracks of the nut ball rolling track (21), and the rolling paths of the balls (4) on the spiral ball rolling track (11) and the nut ball rolling track (21) are connected end to end through the ball rolling track (31); The ball rolling path (31) cooperates with the spiral ball rolling path (11) and the nut ball rolling path (21) to form a closed circuit in which the balls (4) flow back in a single circle in the ball screw pair, thereby forming a closed channel for ball circulation operation; The reciprocating rolling of the balls (4) in the ball circulation closed channel causes the screw nut (2) and the ball screw (1) to generate relative displacement and displacement reversal.

2. The ball screw pair with a circulator embedded in the outer circle of the ball screw according to claim 1, characterized in that: Ball circulator positioning holes (12) that are adapted to the shape and size of the ball circulator (3) are respectively arranged on the outer circle of the ball screw (1), and the ball circulator positioning holes (12) cooperate with the embedding of the ball circulator (3).

3. The ball screw pair with a circulator embedded in the outer circle of the ball screw according to claim 1, characterized in that: The ball circulator (3) is provided with a circulator ball raceway (31), and the circulator ball raceway (31) guides the balls (4) to cross two adjacent raceways of the spiral ball raceway (11) and two corresponding raceways of the nut ball raceway (21) to form a single-turn closed-loop circulation.

4. The ball screw pair with a circulator embedded in the outer circle of the ball screw according to claim 1, characterized in that: The ball circulator (3) is also provided with a positioning block (32), and the positioning block (32) cooperates with the spiral ball rolling track (11) and the nut ball rolling track (21) for positioning.

5. The ball screw pair with a circulator embedded in the outer circle of the ball screw according to claim 4, characterized in that: The positioning block (32) is a spiral ring-shaped positioning block.

6. The ball screw pair with a circulator embedded in the outer circle of the ball screw according to claim 1, characterized in that: The ball circulators (3) are provided in plurality, and the number of the ball circulator positioning holes (12) is adapted to the number of the ball circulators (3).

7. The ball screw pair with a circulator embedded in the outer circle of the ball screw according to claim 1, characterized in that: The ball screw (1) is provided with a push rod (5), and the push rod (5) is connected to a peripheral device as a force output end.

Images