Ball screw pair with ball circulating mechanism on screw body

Abstract

The utility model relates to the technical field of ball screws, in particular to a ball screw pair with a ball circulating mechanism on a screw body. Comprising a lead screw, a nut, balls and two ball circulators arranged at the two ends of a threaded body of the lead screw respectively. The lead screw and the nut are matched and jointly form a spiral raceway used for rolling of the balls. The ball circulator is provided with a circulating raceway and a ball inlet and outlet threaded raceway which are communicated with each other; the ball inlet and outlet threaded raceway is jointed with the spiral raceway on the thread body fitting surface of the screw rod; a ball reverse channel is arranged in the threaded body of the screw rod and communicated with the circulating raceway, so that the ball circulator can be applied to a ball screw rod pair applied by functional parts with limited space, and the transmission precision and stability are further enhanced while the transmission efficiency is improved by utilizing the ball circulating raceway; a closed-loop circulation system is formed, smooth operation of the balls is guaranteed, different space requirements are flexibly met, and the same efficient and reliable effect is achieved in a space limited scene.

Description

Technical Field

[0001] The utility model relates to the technical field of ball screws, in particular to a ball screw pair with a ball circulation mechanism on a screw body. Background Art

[0002] The ball circulator of the ball screw provides a channel for the ball to circulate in the nut. The threads in the screw and nut are one-way and not closed. Without the ball circulator, the ball cannot achieve reciprocating rolling. The reciprocating rolling of the ball causes the nut and the screw to produce relative displacement and displacement reversal. Therefore, the ball circulator of the ball screw is an indispensable component of the ball screw pair.

[0003] The prior art ball screw pair ball circulators mostly adopt two structures: an external circulation duct type and an internal circulation type.

[0004] External circulation duct type: fold the steel pipe into a U shape, make the inlets and outlets at both ends of the steel pipe into special shapes, install and fix them on the nuts, and connect the inlets and outlets at both ends with the threaded raceway, so that the balls on the threaded raceway flow back in the U-shaped bent pipe to form a closed loop circuit of the balls on the threaded raceway, realizing the orderly circulation of the balls on the threaded raceway.

[0005] Internal circulation type: a mechanism is embedded in the inner raceway of the nut, and a special-shaped channel is made on the mechanism to cross and connect two adjacent raceways, so that the balls form a single closed reflux raceway. This forms a closed loop of the balls on the thread raceway, and the balls circulate in an orderly manner on the thread raceway.

[0006] Furthermore, the ball circulator in the prior art cannot be applied to the miniature ball screw pair used in the functional components such as the miniature electric cylinder and the power slide. Utility Model Content

[0007] The purpose of the utility model is to provide a ball screw pair with a ball circulation mechanism on a screw body in response to the defects existing in the prior art, so that the ball circulator can be applied to ball screw pairs used in conventional functional components, and can also be applied to miniature ball screw pairs used in functional components with limited space. The utility model has a compact structure, utilizes the ball circulation raceway to improve the transmission efficiency while further enhancing the transmission accuracy and stability, forming a closed-loop circulation system to ensure smooth operation of the balls, flexibly adapt to different space requirements, and achieve the same efficient and reliable effect in space-constrained scenarios.

[0008] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: it includes a screw, a nut, a ball and two ball circulators respectively arranged at the two ends of the threaded body of the screw; the screw and the nut cooperate and jointly form a spiral raceway for the rolling of the balls; the ball circulator is provided with a connected circulation raceway and a ball in-and-out threaded raceway, and the ball in-and-out threaded raceway is matched with the spiral raceway on the mating surface of the threaded body of the screw; a ball reverse channel is provided in the threaded body of the screw and is connected with the circulation raceway; the balls roll back and forth between the spiral raceway formed by the screw and the nut, the circulation raceway of the ball circulator, the ball in-and-out threaded raceway and the ball reverse channel.

[0009] Furthermore, the ball circulator is formed by a first annular component and a second annular component being coupled together; a first ball raceway is provided on the annular mating surface on the coupled side of the first annular component; a second ball raceway is provided on the annular mating surface on the coupled side of the second annular component, and the ball circulator is formed by the first ball raceway and the second ball raceway together forming the circulating raceway after the first annular component and the second annular component are coupled together; the ball inlet and outlet on the first annular component are connected to the ball reverse channel.

[0010] Furthermore, a plurality of uniform and symmetrical circulating raceways may be generated on the relative surfaces of the first annular component and the second annular component, and a plurality of uniform and symmetrical ball entry and exit thread raceways may be generated on the first annular component.

[0011] Furthermore, a spiral annular protrusion block which can be embedded in the spiral raceway on the nut is arranged on the outer annular surface of the first annular component.

[0012] Furthermore, a first ball guide port is provided inside the spiral annular protrusion block, and the first ball guide port is connected with the spiral raceway to form a ball import and export structure, and cooperates with the ball reverse channel to form a closed-circuit ball circulation system.

[0013] Furthermore, a blocking component is provided for axial limiting.

[0014] Furthermore, the axial position can be limited by a round nut through a thread, and fixed at the axial end surface position by screws and glue.

[0015] Furthermore, positioning pin holes may be provided on the joint surfaces of the first annular component and the second annular component.

[0016] A circulation method of a ball screw pair with a ball circulation mechanism on a screw body, wherein the screw rod or the nut rotates and the balls in the spiral raceway start to roll;

[0017] The balls enter the first annular component of the ball circulator through the spiral annular protrusion of the first annular component of the ball circulator at one end of the threaded body of the screw rod and the first ball guide port;

[0018] The balls enter the ball reverse channel through the first ball rolling path of the first annular component and the second ball rolling path of the second annular component;

[0019] The balls enter the ball circulator at the other end of the threaded body of the screw rod through the ball reverse channel;

[0020] The balls leave the ball circulator, enter the spiral raceway and start to circulate and roll;

[0021] The screw rod or the nut is rotated in the reverse direction, and the balls are circulated and rolled in the reverse direction.

[0022] Through the technical solution of the utility model, the following technical effects can be achieved:

[0023] The invention comprises a screw rod, a nut, a ball and two ball circulators respectively arranged at two ends of the threaded body of the screw rod; the screw rod and the nut cooperate to form a spiral raceway for the rolling of the ball; the ball circulator is provided with a connected circulation raceway and a ball in-and-out threaded raceway, and the ball in-and-out threaded raceway is matched with the spiral raceway on the mating surface of the threaded body of the screw rod; a ball reverse channel is provided in the threaded body of the screw rod and is connected with the circulation raceway; the ball rolls back and forth between the spiral raceway formed by the screw rod and the nut, the circulation raceway of the ball circulator, the ball in-and-out threaded raceway and the ball reverse channel, so that the ball circulator can be applied to both the ball screw pair used in conventional functional components and the micro ball screw pair used in functional components with limited space, and has a compact structure, utilizes the ball circulation raceway to improve the transmission efficiency while further enhancing the transmission accuracy and stability, forms a closed-circuit circulation system to ensure the smooth operation of the ball, flexibly adapts to different space requirements, and has the same efficient and reliable effect in space-constrained scenes. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1It is a schematic diagram of a ball screw pair of a ball circulation mechanism on a screw body in an embodiment of the utility model;

[0026] Figure 2 This is a schematic diagram of the structure after the nut is removed in the embodiment of the utility model;

[0027] Figure 3 A schematic diagram of a ball reverse channel in an embodiment of the utility model;

[0028] Figure 4 This is a schematic diagram of the first annular component in an embodiment of the utility model;

[0029] Figure 5 It is a schematic diagram of the second annular component in the embodiment of the utility model;

[0030] Figure 6 It is a schematic diagram of a nut in an embodiment of the utility model;

[0031] Figure 7 It is a schematic diagram of a first annular component provided with a plurality of raceways in an embodiment of the utility model;

[0032] Figure 8 It is a schematic diagram of a second annular component provided with a plurality of raceways in an embodiment of the utility model;

[0033] Fig. 9 A schematic diagram of a ball circulation track in an embodiment of the utility model;

[0034] Reference numerals:

[0035] Ball screw 1, spiral raceway 11, ball reverse channel 12, nut 2, ball 3, ball circulation raceway 31, first annular component 4, ball inlet and outlet thread raceway 40, first ball raceway 42, spiral annular raised block 43, first ball inlet and outlet 45, first ball guide port 46, second annular component 5, second ball raceway 52, second ball inlet and outlet 55, second ball guide port 56. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0037] In the description of the present invention, it should be noted that the directions or positional relationships indicated by “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside”, etc., are based on the directions or positional relationships shown in the accompanying drawings, and 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0038] A ball screw pair with a ball circulation mechanism on a screw body, such as Figure 1 and 2 As shown, it includes a screw rod 1, a nut 2, a ball 3 and two ball circulators respectively arranged at the two ends of the threaded body of the screw rod 1; the screw rod 1 and the nut 2 cooperate and jointly form a spiral raceway 11 for the ball 3 to roll; the ball circulator is provided with a connected circulation raceway 31 and a ball entry and exit threaded raceway 40, and the ball entry and exit threaded raceway 40 is relatively matched with the spiral raceway 11 on the mating surface of the threaded body of the screw rod 1; a ball reverse channel 12 is provided in the threaded body of the screw rod 1 and is connected with the circulation raceway 31; the ball 3 rolls reciprocatingly among the spiral raceway 11 formed by the screw rod 1 and the nut 2, the circulation raceway 31 of the ball circulator, the ball entry and exit threaded raceway 40 and the ball reverse channel 12.

[0039] Specifically, after the screw rod 1 or the nut 2 is rotated, the ball 3 in the spiral raceway 11 starts to roll, and the ball 3 enters the ball reverse channel 12 of the ball circulator via the ball circulator at one end of the threaded body of the screw rod 1, and then the ball 3 enters the ball circulator at the other end of the threaded body of the screw rod 1 through the ball reverse channel 12; then the ball 3 leaves the ball circulator and enters the spiral raceway 11 and starts to circulate and roll; when the screw rod 1 or the nut 2 is rotated in the reverse direction, the ball 3 rolls in the reverse circulation. This allows the ball to roll continuously and smoothly between the screw and the nut, avoiding the loss or jamming of the ball. This efficient circulation mechanism ensures the continuity and stability of the transmission, and ensures that the ball can move in and out smoothly during the rolling process, reducing friction and wear, further extending the service life of the ball and the screw, and reducing the heat and energy loss caused by friction. The cyclic rolling of the ball makes the transmission process smoother and reduces impact and vibration. Due to the small resistance of rolling friction, the transmission efficiency is improved, and power can be converted and transmitted more efficiently. At the same time, the ball can make full use of the space between the screw and the nut during the circulation process, reducing unnecessary gaps and waste. The entire mechanism is more compact and efficient, and is further suitable for application scenarios on functional components with limited space.

[0040] As a preferred embodiment of the above, Figure 4 and 5 As shown, the ball circulator is composed of a first annular component 4 and a second annular component 5 that are relatively combined; the first annular component 4 has a first ball raceway 42 on the annular mating surface on the relatively combined side; the second annular component 5 has a second ball raceway 52 on the annular mating surface on the relatively combined side, and the ball circulator is formed by the first annular component 4 and the second annular component 5 being relatively combined, and the first ball raceway 42 and the second ball raceway 52 together form the circulating raceway 31; the ball inlet and outlet 45 on the first annular component 4 is connected with the ball reverse channel 12.

[0041] Specifically, the first annular component 4 has a first ball track 42, and the second annular component 5 has a second ball track 52. When the two components are relatively combined, the first ball track 42 and the second ball track 52 jointly form a circulation track 31, ensuring the accuracy of the circulation track, so that the balls can maintain a stable track during the rolling process. At the same time, the ball inlet and outlet 45 on the first annular component 4 is connected with the ball reverse channel 12. This design allows the balls to smoothly enter the ball reverse channel 12 from the circulation track 31, and then return to the circulation track 31 from the other end, realizing the continuous circulation of the balls. The close connection between the ball inlet and outlet 45 and the ball reverse channel 12 avoids the blockage or falling off of the balls, thereby enhancing the reliability of the ball circulation. And because the ball circulator is composed of two annular components, when one of the components (such as the first annular component 4 or the second annular component 5) is damaged or needs to be replaced, it is only necessary to disassemble and replace the component separately without disassembling the entire ball circulator, thereby greatly simplifying the maintenance and replacement process. At the same time, this modular design makes the manufacturing and assembly process more convenient. The first annular component 4 and the second annular component 5 can be manufactured separately, and then combined together in a relative manner to form a complete ball circulator. Moreover, the structure of the first annular component 4 and the second annular component 5, as well as the connection method between the ball inlet and outlet 45 and the ball reverse channel 12, make the spatial layout of the entire ball circulation mechanism more compact and reasonable. This optimization reduces unnecessary space occupation and is further suitable for application scenarios on functional components with limited space.

[0042] As a preferred embodiment of the above, Figure 7 and 8 As shown, a plurality of uniform and symmetrical ball circulation raceways 31 can be generated on the mating surfaces of the first annular component 4 and the second annular component 5 , and a plurality of uniform and symmetrical ball entry and exit thread raceways 40 can be generated on the first annular component 4 .

[0043] Specifically, by adjusting the number, layout and size of the ball circulation raceway 31 and the ball in-and-out threaded raceway 40, different application scenarios and requirements can be adapted. At the same time, multiple uniform and symmetrical ball circulation raceways 31 allow more balls 3 to participate in the transmission at the same time, which increases the number of contact points between the balls and the spiral raceway 11, thereby improving the transmission efficiency. The balls roll simultaneously in multiple circulation raceways, which can transmit power and torque more quickly, reduce the friction and resistance caused by a single raceway, and the uniform and symmetrical ball circulation raceways 31 and the ball in-and-out threaded raceways 40 make the entire system evenly stressed, reducing the vibration and noise caused by uneven stress. In addition, the setting of multiple raceways also increases the redundancy of the system. Even if a raceway or ball has a problem, the other raceways and balls can still continue to work, improving reliability.

[0044] As a preferred embodiment of the above, Figure 4 As shown, a spiral annular protrusion 43 which can be embedded in the spiral raceway 11 on the nut 2 is provided on the inner annular surface of the first annular component 4 .

[0045] As a preferred embodiment of the above, Figure 4 As shown, a first ball guide port 46 is provided inside the spiral annular protrusion block 43 , and the first ball guide port 46 is connected with the spiral raceway 11 to form a ball introduction and export structure, and cooperates with the ball reverse channel 12 to form a closed-loop ball circulation system.

[0046] Specifically, the first ball guide port 46 on the inner side of the spiral annular protrusion 43 is connected to the spiral raceway 11 to form a ball introduction and export structure. This structure can accurately guide the balls to enter and exit from the spiral raceway 11, ensuring the smooth flow of the balls during the circulation process. At the same time, this design cooperates with the ball reverse channel 12 to form a closed-circuit ball circulation system, so that the balls can circulate continuously in the system, improving the continuity and reliability of the transmission.

[0047] As a preferred embodiment of the above, Figure 1 As shown, a blocking component is also provided for axial limiting.

[0048] As a preference of the above embodiment, the axial position can also be limited by a round nut through a thread, and fixed at the axial end face position by screws and glue.

[0049] Specifically, a blocking device is provided for axial limiting, and the blocking device is a blocking component with a retaining spring, a retaining groove, and a structure in which axial limiting can be performed by a threaded round nut, so as to perform axial limiting and position correction on the circulator and the first annular component 4 and the second annular component 5.

[0050] As the above embodiment, positioning pin holes may be formed on the joint surfaces of the first annular component 4 and the second annular component 5 .

[0051] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A ball screw pair with a ball circulation mechanism on a screw body, characterized in that : It comprises a screw rod (1), a nut (2), a ball (3) and two ball circulators respectively arranged at two ends of the threaded body of the screw rod (1); The screw rod (1) and the nut (2) cooperate to form a spiral raceway (11) for the balls (3) to roll on; The ball circulator is provided with a communicating circulation raceway (31) and a ball entry and exit thread raceway (40), wherein the ball entry and exit thread raceway (40) is aligned with the spiral raceway (11) on the thread body mating surface of the screw rod (1); A ball reversal channel (12) is provided in the threaded body of the screw rod (1) and is in communication with the circulating raceway (31); The balls (3) roll back and forth between the spiral raceway (11) formed by the screw rod (1) and the nut (2), the circulating raceway (31) of the ball circulator, the ball entry and exit threaded raceway (40) and the ball reverse channel (12).

2. The ball screw pair of the ball circulation mechanism on the screw body according to claim 1, characterized in that: The ball circulator is formed by a first annular component (4) and a second annular component (5) being coupled together; a first ball track (42) is provided on the annular coupling surface on the coupled side of the first annular component (4); a second ball track (52) is provided on the annular coupling surface on the coupled side of the second annular component (5); and the ball circulator is formed by the first ball track (42) and the second ball track (52) jointly forming the circulating track (31) after the first annular component (4) and the second annular component (5) are coupled together; and the ball inlet and outlet (45) on the first annular component (4) is connected to the ball reverse channel (12).

3. The ball screw pair of the ball circulation mechanism on the screw body according to claim 2, Features: A plurality of uniformly symmetrical circulating raceways (31) can be generated on the mating surfaces of the first annular component (4) and the second annular component (5), and a plurality of uniformly symmetrical ball entry and exit thread raceways (40) can be generated on the first annular component (4).

4. The ball screw pair of the ball circulation mechanism on the screw body according to claim 3, characterized in that: The outer annular surface of the first annular component (4) is provided with a spiral annular protrusion (43) which can be embedded in the spiral raceway (11) on the nut (2).

5. The ball screw pair of the ball circulation mechanism on the screw body according to claim 4, characterized in that: A first ball guide opening (46) is provided inside the spiral annular protrusion block (43). The first ball guide opening (46) is connected with the spiral raceway (11) to form a ball introduction and export structure, and cooperates with the ball reverse channel (12) to form a closed-circuit ball circulation system.

6. The ball screw pair of the ball circulation mechanism on the screw body according to claim 5, characterized in that: A blocking component is also provided for axial limiting.

7. The ball screw pair of the ball circulation mechanism on the screw body according to claim 6, characterized in that: The axial position can also be limited by a round nut through the thread, and fixed at the axial end face position by screws and glue.

8. The ball screw pair of the ball circulation mechanism on the screw body according to claim 7, characterized in that: Positioning pin holes may be provided on the joint surfaces of the first annular component (4) and the second annular component (5).

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