A ball screw nut with a rolling ball end face in reverse

Abstract

The application discloses a ball screw nut with rolling ball end face reverse, and relates to the field of mechanical transmission.The ball screw nut comprises a nut body, an axial through nut reverse hole and a nut oil injection hole for injecting lubricating medium are formed in the outer wall of the nut body.Compared with the end plug type reverse device assembly, the reverse mechanism is completely transferred from the inside of the metal nut to the outside, the nut structure is greatly simplified, the material and processing cost are significantly reduced, the precision is more easily ensured, the reverse device assembly and the sealing ring are combined into one, the number of parts is reduced from three to one, the cost is reduced, the assembly is simplified, the interface between the reverse device and the nut channel is changed from the previous sudden change to gradual change, the assembly precision and difficulty are effectively reduced, the flexibility of the transmission process is improved, and the heat and noise are reduced.

Description

Technical Field

[0001] This invention relates to technology, specifically to a ball screw nut with the end face of the rolling ball reversed. Background Technology

[0002] Ball screw pairs are widely used in various modern CNC automation equipment. Their design and manufacturing are very difficult, especially the nuts of ball screw pairs. Currently, the nuts of ball screw pairs on the market have complex structures, are difficult to process, are not easy to guarantee accuracy, and are difficult to achieve optimal performance.

[0003] In the typical end-plug type reverser nut transmission process currently on the market, the reversal of the balls in the nut is achieved by the end-plug type reverser built into both ends of the nut and fixed with snap rings. For dust prevention and sealing, a sealing ring is set at the outer end. This type of nut has a complex structure, many parts, and it is difficult to guarantee the machining accuracy at both ends of the nut. The position of the lubricating oil entering the nut often interferes with the snap ring or sealing ring, affecting the lubrication and sealing of the nut. The existence of these problems leads to high manufacturing cost, low yield, easy jamming, excessive heat generation, and excessive noise during nut transmission. To address this, a ball screw pair nut with reversible end faces of the rolling balls is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a ball screw nut with the rolling ball end face reversed, so as to solve the problems in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a ball screw nut with the rolling ball end face reversed, comprising:

[0006] The nut body has an axially penetrating nut reverse hole and a nut oil injection hole for injecting lubricating medium on its outer wall. The nut body has the nut reverse hole, a nut groove for ball bearing circulation, and a reverser mounting screw hole for mounting a reverser at both axial ends.

[0007] A reverser assembly is installed at both axial ends of the nut body. The reverser assembly is provided with a reverser raceway, which is coaxially aligned with the reverser hole of the nut, and is used to guide the balls to reverse at the end.

[0008] For ease of manufacturing, the inverter needs to be divided into two parts, including the inverter body and the inverter insert.

[0009] The inverter body has an inverter body raceway and an inverter body notch.

[0010] The reverser insert is provided with a reverser insert protrusion and a reverser insert raceway.

[0011] Furthermore, the protrusion of the reverser insert and the notch of the reverser body form a plug-in mating structure. The protrusion of the reverser insert is inserted into the notch of the reverser body to form an anti-misalignment positioning structure. The raceway of the reverser insert and the raceway end face of the reverser body are connected and connected. Together, they form a complete ball reversing channel to guide the ball from the nut groove through the nut reversing hole into the reverser raceway to complete the reversing and return to the circulation loop.

[0012] Furthermore, the inverter assembly has sealing lips on both the inverter body and the inverter insert. The sealing lips include the sealing lip on the inverter insert and the sealing lip on the inverter body, enabling the inverter itself to perform the function of a traditional sealing ring.

[0013] In order to form the circuit of the raceway of the reverser body, the surrounding solid material naturally forms the sealing lip of the traditional ball nut seal. By spirally extending this part of the solid (which can be more than one turn; in order to control the total length of the nut, the sealing lip of the traditional seal generally does not exceed half a turn), a better sealing effect than the traditional seal can be achieved.

[0014] Furthermore, the reverser assembly is detachably threadedly connected to the nut body by a screw passing through the reverser mounting screw hole; the reverser mounting screw hole is opened on the end face of the nut body, and the mounting surface of the reverser assembly fits against the end face of the nut body.

[0015] Compared with the end-plug type reversing scheme, this invention completely moves the reversing mechanism from inside the metal nut to the outside, which greatly simplifies the nut structure, significantly reduces material and processing costs, and makes it easier to ensure accuracy. By combining the reversing device assembly and the sealing ring into one, the number of parts at this point is reduced from three (reversing device, snap ring, and sealing ring) to one, reducing costs and simplifying assembly. At the same time, the interface between the reversing device and the nut groove is changed from an abrupt change to a gradual change, which can effectively reduce assembly accuracy and difficulty, improve the smoothness of the transmission process, reduce heat generation and noise, and move the oil injection port to the middle of the nut groove, resulting in better lubrication and reduced oil leakage. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0017] Figure 1 This invention relates to the end-face reverse type ball screw nut;

[0018] Figure 2This is the body of the end-face reverse-type ball screw nut of the present invention;

[0019] Figure 3 This invention relates to an integral end-face inverter;

[0020] Figure 4 This invention relates to a split-type end-face inverter;

[0021] Figure 5 This is the main body of the split-type inverter of the present invention;

[0022] Figure 6 This is the split-type inverter insert portion of the present invention;

[0023] Figure 7 Another perspective of the split-type inverter insert portion of the present invention;

[0024] Figure 8 This is a popular type of end-plug reverse ball nut on the market;

[0025] Figure 9 The body of the popular end-plug type reverse ball nut on the market;

[0026] Figure 10 This is a popular end-plug type reverse ball nut reverser on the market;

[0027] Figure 11 It is a popular end-plug type reverse ball nut seal ring on the market.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. End-face reversed ball screw nut; 2. Nut body; 21. Nut groove; 20. Nut reverse hole; 22. Nut oil injection hole; 23. Reversing device mounting screw hole; 3. Reversing device assembly; 30. Reversing device raceway; 31. Reversing device body; 32. Reversing device insert; 33. Reversing device split surface; 300. Reversing device body raceway; 330. Reversing device body notch; 331. Reversing device insert protrusion; 301. Reversing device insert raceway; 350. Sealing lip; 351. Sealing lip on the reversing device insert; 352. Sealing lip on the reversing device body; 4. Popular ball screw nut assembly; 40. Popular ball screw nut body; 41. Popular sealing ring; 42. Snap ring; 43. Popular end-plug type reversing device; 400. Reversing device mounting hole; 401. Popular ball screw nut oil injection hole; 451. Sealing lip of conventional sealing ring. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0031] As attached Figure 1 To be continued Figure 7 As shown:

[0032] This invention provides a ball screw nut with reversed end faces, comprising a reversed end face ball screw nut 1, and further comprising:

[0033] Nut body 2, the outer wall of nut body 2 is provided with nut reverse hole 20 that runs through the axis and nut oil injection hole 22 for injecting lubricating medium, nut groove 21 for ball to circulate through and reverser mounting screw hole 23 for mounting reverser.

[0034] The reverser assembly 3 is installed at both ends of the axial direction of the nut body 2. The reverser assembly 3 is provided with a reverser raceway 30, which is coaxially aligned with the reverser hole 20 of the nut, and is used to guide the balls to achieve reversal at the end.

[0035] It should be noted that in actual production, for ease of manufacturing, the inverter assembly 3 is divided into two parts along the inverter dividing surface 33, and the inverter body 31 and the inverter insert 32 are spliced ​​together to form a complete inverter assembly 3.

[0036] The inverter assembly 3 includes an inverter body 31 and an inverter insert 32;

[0037] The inverter body 31 is provided with an inverter body raceway 300 and an inverter body notch 330.

[0038] The inverter insert 32 is provided with an inverter insert protrusion 331 and an inverter insert raceway 301;

[0039] The present invention is further described in detail as follows: the nut reverse hole 20 is a through hole structure, and the reverser raceway 30 is precisely connected to it to form a reverse circulation channel for the balls; the nut groove 21 is a helical raceway used to form the working circulation path of the balls; the reverser mounting screw hole 23 is a threaded connection hole used to fix the reverser assembly 3; the reverser raceway 30 is connected to the nut groove 21 to form part of the ball circulation channel; the reverser body notch 330 is a positioning structure used to cooperate with the reverser insert protrusion 331 to achieve precise assembly;

[0040] The present invention is further described in detail as follows: the reverser insert protrusion 331 and the reverser body notch 330 form a plug-in mating structure. The reverser insert protrusion 331 is inserted into the reverser body notch 330 to form an anti-misalignment positioning structure. The reverser insert raceway 301 and the reverser body raceway 300 end face are connected and connected. The two together form a complete ball reversing channel to guide the ball from the nut groove 21 through the nut reversing hole 20 into the reverser raceway 30 to complete the reversal and return to the circulation loop.

[0041] The present invention is further described in detail. The reverser assembly 3 is detachably threadedly connected to the nut body 2 by a screw passing through the reverser mounting screw hole 23. The reverser mounting screw hole 23 is opened on the end face of the nut body 2, and the mounting surface of the reverser assembly 3 is in contact with the end face of the nut body 2.

[0042] In order to form the loop of the raceway of the reverser body, the surrounding solid material naturally forms the sealing lip 350 of the conventional ball nut seal ring. The sealing lip 350 includes the sealing lip 351 on the reverser insert and the sealing lip 352 on the reverser body, so that the reverser itself realizes the function of the conventional seal ring. By spirally extending this part of the solid (which can be more than one turn; in order to control the total length of the nut, the sealing lip of the conventional seal ring is generally no more than half a turn), a better sealing effect than the conventional seal ring can be achieved.

[0043] With the above technical solution, during the transmission process, the ball rolls in the nut groove 21. When the ball rolls to the end of the nut groove 21, due to the gradual docking design between the reverser raceway 30 and the nut groove 21, the ball can smoothly and gradually enter the reverser raceway 30 inside the end face reverser assembly 3. Then, the ball enters the reverser raceway 30 in the end face reverser through the nut reverse hole 20 provided on the nut body 2. Finally, the ball gradually enters the nut groove 21 inside the nut body 2 again. This cycle repeats, realizing the continuous cyclic movement of the ball in the nut, thereby completing the power transmission process from the ball screw to the nut.

[0044] like Figure 4 The split-type end-face reverser shown adopts a split design mainly to facilitate injection molding. While ensuring the convenience of injection molding, the design of the parting surface needs to comprehensively consider the strength of the parts, the convenience of assembly, and the guarantee of assembly accuracy. Through reasonable parting surface design, it can not only ensure that the split-type end-face reverser has good molding quality during manufacturing, but also be easily and quickly assembled into a complete reverser during assembly, while ensuring the accuracy and stability after assembly to meet the working requirements of the ball screw pair nut.

[0045] As attached Figure 8 To be continued Figure 11 As shown:

[0046] The popular ball screw nut assembly 4 is a conventional structure in the prior art. The popular ball screw nut assembly 4 includes a popular ball screw nut body 40, a popular sealing ring 41, a snap ring 42, and a popular end plug type reverser 43. The popular ball screw nut body 40 includes a reverser mounting hole 400 and a popular ball screw nut oil injection hole 401.

[0047] With the above technical solution, the traditional end-plug type reverser nut relies on the popular end-plug type reverser 43 built into both ends of the nut to reverse the ball, and is fixed by the snap ring 42. The outer end also needs to be set with a popular sealing ring 41 for dust prevention and sealing. The number of parts is relatively large. However, the end face type reverser assembly 3 of the present invention combines the reverser body 31 and the popular sealing ring 41 into one, eliminating the snap ring 42 that used to fix the popular end plug type reverser 43. This reduces the number of parts from three to one. The reduction in the number of parts not only simplifies the assembly process and reduces the risk of assembly errors that may occur due to the large number of parts, but also reduces the management and inventory costs of many parts in the production process.

[0048] Traditional nuts have end plug holes at both ends, making it difficult to guarantee machining accuracy and increasing the complexity and difficulty of machining. This invention changes the reverser assembly 3 from end plug type installation to end face type installation, eliminating the end plug holes at both ends of the nut, thereby shortening the length of the nut's metal part. This change simplifies the nut's machining process, makes it easier to control and optimize the tool path and cutting parameters during machining, makes it easier to guarantee machining accuracy, and effectively reduces machining costs and scrap rate.

[0049] In traditional structures, the interface between the reverser and the nut groove 21 is often abruptly designed. When the ball passes through this interface, problems such as uneven movement and jamming are likely to occur, affecting the smoothness of transmission. However, the reverser raceway 30 and the nut groove 21 of this invention adopt a gradual connection design. When the ball enters the reverser raceway 30 from the nut groove 21 and moves in the reverse direction, it can transition more smoothly, reducing the impact and friction caused by the abrupt interface. This effectively reduces heat generation and noise during transmission, and improves transmission efficiency and stability.

[0050] After the end face type reverser assembly 3 is combined with the popular sealing ring 41, the length of the seal and dustproof can be designed to be longer according to actual needs. The longer seal and dustproof structure can more effectively block external dust and impurities from entering the nut, while better preventing lubricating oil leakage, providing a cleaner and more stable working environment for the ball screw pair, and further improving its working performance and reliability.

[0051] Traditional structures make it difficult to use end plug type reverser assembly 3 in short lead nuts, which limits the design and application of short lead nuts. However, the end cap type reverser assembly 3 of the present invention does not need to be installed inside the nut, which brings great flexibility to the design. This flexible structural design makes it easy to use end face reverser structure in short lead nuts, solves the problem of reverser installation in short lead nuts, and expands the application range of ball screw pairs.

[0052] The design of the split-face reverser is mainly for the convenience of injection molding. While ensuring the convenience of injection molding, the design of the parting surface fully considers the strength of the parts, the convenience of assembly, and the guarantee of assembly accuracy. This design allows the ball screw pair nut to flexibly adjust the structure and parameters of the reverser according to different operating conditions and performance requirements, so as to better meet the diverse needs of various CNC automation equipment.

[0053] Because end-face mounting shortens the length of the nut's metal portion, it reduces the amount of material used, thereby lowering material costs. At the same time, the reduction in the number of parts also means lower costs in raw material procurement and management. As mentioned earlier, the reduced processing difficulty leads to shorter processing time, less tool wear, and a corresponding reduction in processing costs. Furthermore, the reduced assembly difficulty and simplified assembly process reduce the manpower and time required for assembly, further lowering assembly costs.

[0054] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A ball screw nut with reversed end faces, comprising a reversed end face ball screw nut (1), characterized in that, It also includes: Nut body (2), the outer wall of the nut body (2) is provided with a nut reverse hole (20) that runs through the axis and a nut oil injection hole (22) for injecting lubricating medium. The nut body (2) is provided with the nut reverse hole (20), the nut groove (21) for ball circulation, and the reverse mounting screw hole (23) for installing the reverser at both ends of the axis. The reverser assembly (3) is symmetrically installed at both ends of the axial direction of the nut body (2). The reverser assembly (3) is provided with a reverser raceway (30). The reverser raceway (30) is coaxially aligned with the reverser hole (20) of the nut and is used to guide the balls to reverse at the end. The inverter assembly (3) includes an inverter body (31) and an inverter insert (32). The inverter body (31) is provided with an inverter body raceway (300) and an inverter body notch (330). The reverser insert (32) is provided with a reverser insert protrusion (331) and a reverser insert raceway (301).

2. The ball screw nut with reversed end faces of the rolling balls according to claim 1, characterized in that, The reverser insert protrusion (331) and the reverser body notch (330) form a plug-in mating structure. The reverser insert protrusion (331) is inserted into the reverser body notch (330) to form an anti-misalignment positioning structure. The reverser insert raceway (301) and the reverser body raceway (300) end face are connected and connected. Together, they form a complete ball reversing channel to guide the ball from the nut groove (21) through the nut reversing hole (20) into the reverser raceway (30) to complete the reversal and return to the circulation loop.

3. The ball screw nut with reversed end faces of the rolling balls according to claim 1, characterized in that, The reverser assembly (3) is detachably threaded to the nut body (2) by means of a screw passing through the reverser mounting screw hole (23); the reverser mounting screw hole (23) is opened on the end face of the nut body (2), and the mounting surface of the reverser assembly (3) is in contact with the end face of the nut body (2).

4. The ball screw nut with reversed end faces of the rolling balls according to claim 3, characterized in that, The inverter assembly (3) has a sealing lip (350) on the inverter body (31) and the inverter insert (32), respectively. The sealing lip (350) includes a sealing lip (351) on the inverter insert and a sealing lip (352) on the inverter body.

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