Ball screw pair with circulator embedded on screw body

Abstract

The utility model relates to the technical field of ball screws, in particular to a ball screw pair with a circulator embedded in a screw body. Comprising a ball screw, a screw nut and balls. Ball circulators are embedded in the positions, close to the two ends, of the ball screw respectively; the ball screw is provided with a spiral ball raceway, and the spiral ball raceway is communicated with a ball reverse channel in the ball screw through a ball circulator. The screw nut is provided with spiral ball raceways, and the spiral ball raceways are oppositely combined; the ball circulator is provided with a circulator ball raceway; the spiral ball raceway is matched with the spiral ball raceway to be communicated with the ball reverse channel and the circulator ball raceway to form a structure of a ball circulating operation closed channel, so that the occupied space of the ball screw pair on functional parts such as a microminiature 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 present invention relates to the technical field of ball screws, and particularly to a ball screw pair with a circulator embedded in a screw body. Background Art

[0002] In the prior art, as a precision transmission element, 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 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 electric cylinders and power slides, higher requirements are put forward for the miniaturization, light weight, 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 Invention

[0005] The object of the present invention is to provide a ball screw pair with a circulator embedded in a screw body for 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 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 invention is: a ball screw pair with a circulator embedded on a screw body, including a ball screw, a screw nut, and balls; ball circulators are respectively embedded at positions near both ends of the ball screw; the ball screw is provided with a spiral ball raceway, and is communicated with a ball reverse channel inside the ball screw through the ball circulator; the screw nut is provided with a spiral ball raceway, and the spiral ball raceway is engaged with the spiral ball raceway; the ball circulator is provided with a circulator ball raceway; the spiral ball raceway cooperates with the spiral ball raceway to be communicated with the ball reverse channel and the circulator ball raceway, and forms a closed channel for the balls to circulate; the balls reciprocally circulate and roll in the closed channel for the balls to circulate, and cause relative displacement and displacement commutation between the screw nut and the ball screw.

[0007] Further, ball circulator positioning grooves adapted to the shape and size of the ball circulators are respectively provided at both ends of the ball screw.

[0008] Further, a raised block is provided on the arc surface of the circulator ball raceway near the screw nut.

[0009] Further, the raised block is a spiral ring-shaped raised block.

[0010] Further, the spiral ring-shaped raised block cooperates with the circulator ball raceway to form a scraper-shaped structure.

[0011] Further, a push rod is provided on the ball screw, and the push rod is connected to a peripheral device as a force output end.

[0012] By including a ball screw, a screw nut, and balls; ball circulators are respectively embedded at positions near both ends of the ball screw; the ball screw is provided with a spiral ball raceway and is communicated with a ball reverse channel inside the ball screw through the ball circulator; the screw nut is provided with a spiral ball raceway, and the spiral ball raceway is engaged with the spiral ball raceway; the ball circulator is provided with a circulator ball raceway; the spiral ball raceway cooperates with the spiral ball raceway to be communicated with the ball reverse channel and the circulator ball raceway, and forms a closed channel for the balls to circulate; the balls reciprocally circulate and roll in the closed channel for the balls to circulate, and cause relative displacement and displacement commutation between the screw nut and the ball screw, the structure can greatly reduce the occupied space of the ball screw pair on functional components such as micro electric cylinders and power slides, improve the transmission efficiency of micro functional components, and realize the linear motion of the ball screw through the rotation of the nut. Description of the Drawings

[0013] In order to more clearly illustrate the embodiments of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 A three-dimensional perspective view of a ball screw assembly in an embodiment of the present invention;

[0015] Figure 2 A three-dimensional perspective view of the structure after the nut is removed in an embodiment of the present invention;

[0016] Figure 3 A front view of a ball screw in an embodiment of the present invention;

[0017] Figure 4 A top view of a ball screw in an embodiment of the present invention;

[0018] Figure 5 It is a left side view of the ball screw in the embodiment of the present invention;

[0019] Figure 6 It is a right side view of the ball screw in the embodiment of the present invention;

[0020] Figure 7 A three-dimensional perspective view of a ball screw in an embodiment of the present invention;

[0021] Figure 8 A three-dimensional perspective view of a lead screw nut in an embodiment of the present invention;

[0022] Figure 9 It is a front view of the ball circulator in the embodiment of the present invention;

[0023] Figure 10 A top view of a ball circulator in an embodiment of the present invention;

[0024] Figure 11 It is a right side view of the ball circulator in the embodiment of the present invention;

[0025] Figure 12 A three-dimensional perspective view of a ball circulator in an embodiment of the present invention;

[0026] Figure 13 A three-dimensional perspective view of a push rod in an embodiment of the present invention;

[0027] Reference numerals:

[0028] Ball screw 1, screw spiral ball raceway 11, ball reverse channel 12, ball circulator positioning groove 13, screw nut 2, spiral ball raceway 21, ball circulator 3, circulator ball raceway 31, raised block 32, ball 4, push rod 5. DETAILED DESCRIPTION

[0029] 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 the embodiments.

[0030] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside”, etc., are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element 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.

[0031] A ball screw pair with a circulator embedded in the screw body, such as Figure 1 , 2 As shown in , 7 and 12, it comprises a ball screw 1, a screw nut 2 and balls 4; ball circulators 3 are respectively inlaid near both ends of the ball screw 1; the ball screw 1 is provided with a screw spiral ball raceway 11, and is connected with the ball reverse channel 12 inside the ball screw 1 through the ball circulator 3; the screw nut 2 is provided with a spiral ball raceway 21, and the spiral ball raceway 21 is relatively matched with the screw spiral ball raceway 11; the ball circulator 3 is provided with a circulator ball raceway 31; the screw spiral ball raceway 11 cooperates with the spiral ball raceway 21 to be connected with the ball reverse channel 12 and the circulator ball raceway 31, and forms a closed channel for ball circulation; the balls 4 roll back and forth in the closed channel for ball circulation, and cause the screw nut 2 and the ball screw 1 to produce relative displacement and displacement reversal.

[0032] Specifically, by directly embedding the ball circulator 3 at both ends of the ball screw 1, not only the structure is simplified, but also space is saved, making the design of the entire ball screw pair more compact, easy to install and use in a limited space, optimizing the ball circulation path and raceway design, and improving the load-bearing capacity and operating stability of the ball screw pair. At the same time, the continuous circulation of the balls 4 in the closed channel effectively disperses the load, reduces vibration and noise, and improves the reliability and service life of the system. In addition, since the ball circulator 3 is designed to be a detachable or easily accessible component, once the balls 4 or the related raceways are worn, they can be easily maintained or replaced. At the same time, this structure allows relative displacement and position between the screw nut 2 and the ball screw 1. The ball circulator 3 is embedded at both ends of the ball screw 1, and the internal circulator ball raceway 31 is connected with the ball reverse channel 12 inside the ball screw to construct a complete closed channel for ball circulation operation, which significantly improves the circulation efficiency of the ball 4 and reduces the resistance and wear of the ball during the circulation process, thereby improving the overall operation efficiency and life of the ball screw pair. The screw spiral ball raceway 11 of the ball screw 1 and the spiral ball raceway 21 of the screw nut 2 are precisely matched, providing stable support and guidance for the ball 4, and also ensuring the high precision and smoothness of the ball screw pair during operation.

[0033] As a preferred embodiment of the above, Figure 5 , 6 As shown in Figures 7 and 7 , both ends of the ball screw 1 are respectively provided with ball circulator positioning grooves 13 that are adapted to the shape and size of the ball circulator 3 .

[0034] Specifically, the positioning groove 13 can ensure that the ball circulator 3 can be accurately aligned and fixed at the designated position of the ball screw 1 during installation, which not only simplifies the installation process, but also improves the connection strength and stability between the ball circulator 3 and the ball screw 1, reduces the performance degradation or failure risk caused by improper installation, and at the same time, the positioning groove 13 is used to firmly fix the ball circulator 3 on the ball screw 1, which can effectively enhance the rigidity of the entire ball screw pair, and help prevent the ball circulator 3 from loosening or displacement during operation, thereby reducing the problems of poor ball circulation and increased wear caused by looseness. This helps to extend the service life of the ball screw pair and reduce maintenance costs. The shape and size of the positioning groove 13 match the ball circulator 3, further optimizing the path of the ball during the circulation process. The ball can circulate more smoothly between the spiral ball raceway, the ball reverse channel and the circulator ball raceway, reducing the friction and resistance between the ball and the raceway, and improving the operating efficiency of the ball screw pair.

[0035] As a preferred embodiment of the above, Figure 9 ,11 As shown, the circulator ball raceway 31 is provided with a protrusion 32 on the arc surface close to the screw nut 2.

[0036] Specifically, the protruding block 32 guides the ball 4 to ensure that the ball 4 can accurately enter and leave the ball raceway, thereby reducing the falling off or jamming of the ball.

[0037] As a preferred embodiment of the above, Figure 11 , 12 As shown, the protruding block 32 is a spiral ring-shaped protruding block.

[0038] Specifically, the spiral annular protrusion can provide a more precise guiding effect for the ball, ensuring that the ball rolls smoothly along the predetermined spiral track in the ball raceway. This design reduces the deviation and jump of the ball during the circulation process, improves the stability and controllability of the ball movement, and the protrusion can gradually guide the ball 4 to enter and leave the ball raceway, effectively reducing the impact and vibration of the ball 4 when changing direction or entering a new raceway, thereby improving the overall running stability of the ball screw pair.

[0039] As a preferred embodiment of the above, Figure 11 , 12 As shown, the spiral annular protrusion cooperates with the circulator ball raceway 31 to form a scraper-shaped structure.

[0040] Specifically, the blade-shaped structure can more effectively guide the balls to circulate smoothly in the ball raceway, which helps to achieve uniform distribution and force of the balls in the ball raceway. When the balls roll in the raceway, they can evenly carry the load, avoiding local overload and stress concentration, and improving the load-bearing capacity and stability of the ball screw pair.

[0041] As a preferred embodiment of the above, Figure 13 As shown, a push rod 5 is provided on the ball screw 1, and the push rod 5 is connected to a peripheral device as a force output end.

[0042] Specifically, the push rod 5 is a structure connected to the peripheral equipment as the output end of the force. When the ball screw nut 2 rotates, the ball screw 1 performs a linear motion to drive the push rod 5 to perform a telescopic action.

[0043] Specifically, through the rotation of the ball screw or the screw nut, the ball is efficiently circulated between the spiral ball raceway, the ball circulator and the ball reverse channel. Its advantages are: this method not only ensures the continuous and smooth rolling of the ball in the ball screw pair, reduces energy loss and transmission error, and improves transmission accuracy and efficiency; at the same time, through the design of the ball circulator, the circulation path of the ball is optimized, and the bearing capacity and stability of the ball screw pair are enhanced; in addition, the push rod directly and efficiently transmits power with the movement of the ball screw, improving the overall performance and flexibility of the system. This circulation method embeds the ball circulator at both ends of the ball screw body and uses the internal space of the motor rotor as a nut, which can greatly reduce the space occupied by the ball screw pair on the functional components such as micro electric cylinders and power slides, and improve the transmission efficiency of micro functional components. The linear motion of the ball screw is realized through the rotation of the nut.

[0044] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A ball screw pair with a circulator embedded in the screw body, characterized in that: It comprises a ball screw (1), a screw nut (2), and a ball (4); The ball screw (1) is inlaid with ball circulators (3) at positions close to both ends. The ball screw (1) is provided with a screw spiral ball raceway (11), and is connected to a ball reverse channel (12) inside the ball screw (1) through the ball circulator (3); The lead screw nut (2) is provided with a spiral ball rolling track (21), and the spiral ball rolling track (21) is aligned with the lead screw spiral ball rolling track (11); The ball circulator (3) is provided with a circulator ball rolling track (31); The screw spiral ball rolling path (11) cooperates with the spiral ball rolling path (21) to communicate with the ball reverse channel (12) and the circulator ball rolling path (31), thereby forming a closed channel for ball circulation operation; The balls (4) reciprocate and circulate in the ball circulation closed channel, causing 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 screw body according to claim 1, It is characterized in that Both ends of the ball screw (1) are respectively provided with ball circulator positioning grooves (13) adapted to the shape and size of the ball circulator (3).

3. The ball screw pair with a circulator embedded in the screw body according to claim 1, characterized in that: The circulator ball raceway (31) is provided with a protruding block (32) on an arc surface close to the lead screw nut (2).

4. The ball screw pair with a circulator embedded in the screw body according to claim 3, characterized in that: The protruding block (32) is a spiral ring-shaped protruding block.

5. The ball screw pair with a circulator embedded in the screw body according to claim 4, characterized in that: The spiral annular protrusion cooperates with the circulator ball rolling track (31) to form a scraper-shaped structure.

6. The ball screw pair with a circulator embedded in the screw body 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.

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