Ball screw nut structure

Abstract

The utility model discloses a ball screw nut structure which comprises a nut. The roller paths are arranged in the nut and are not communicated with one another; the lead screw is movably sleeved in the nut; and each group of balls correspondingly roll in the corresponding raceway, and each group of balls are located between the nut and the lead screw. The ball bearing further comprises a reverser connected into the nut, the reverser is provided with a plurality of connecting channels, the connecting channels are communicated between the head end and the tail end of the roller path, and at least part of each set of balls is located in the connecting channels in a rolling mode. The containing groove is formed in the nut, and the reverser is connected into the containing groove. The containing groove comprises a rectangular groove, a first arc-shaped groove and a second arc-shaped groove, the first arc-shaped groove and the second arc-shaped groove are communicated with the two ends of the rectangular groove respectively, the reverser is located in the rectangular groove, the first arc-shaped groove and the second arc-shaped groove, and the two side faces of the reverser abut against the two side faces of the rectangular groove respectively. The utility model has the technical effects that not only can the waste of the raceway be avoided, but also the ball can be prevented from being arranged in the unused raceway during assembly.

Description

Technical Field

[0001] This utility model relates to a ball screw nut structure, and more particularly to a ball screw nut structure. Background Technology

[0002] The ball screw nut structure is a high-efficiency and precision transmission component that converts rotary motion into linear motion. Its core design uses the cyclic rolling of balls to reduce friction and improve transmission efficiency and accuracy.

[0003] However, the raceway of the nut in the relevant ball screw nut structure generally presents a complete spiral shape. This not only makes it easy for the ball not to use all the raceways during circulation, thus wasting the raceways, but also makes it easy for the ball to be installed into unused raceways during assembly, resulting in problems such as ball jamming and overheating. Utility Model Content

[0004] Purpose of the utility model: The purpose of this utility model is to provide a ball screw nut structure that not only avoids waste of raceways, but also avoids installing balls into unused raceways during assembly.

[0005] Technical solution:

[0006] A ball screw nut structure, comprising:

[0007] Nut;

[0008] Several raceways, each located within the nut and not interconnected with each other;

[0009] A lead screw that is movably fitted inside the nut;

[0010] Several sets of balls, each set of balls rolling in the raceway, and each set of balls being located between the nut and the lead screw.

[0011] Optionally, it also includes a reverser connected within the nut, the reverser having a plurality of connecting channels communicating between the beginning and end of the raceway, wherein at least a portion of each set of balls rolls within the connecting channels.

[0012] Optionally, it also includes a receiving groove provided in the nut, and the reverser is connected in the receiving groove.

[0013] Optionally, the receiving groove includes a rectangular groove and a first arc-shaped groove and a second arc-shaped groove respectively connected to the two ends of the rectangular groove. The reverser is located in the rectangular groove, the first arc-shaped groove and the second arc-shaped groove, and the two sides of the reverser abut against the two sides of the rectangular groove respectively.

[0014] Optional, also includes:

[0015] A first end cavity is formed at one end of the inverter and at the first arc-shaped groove, the first end cavity being configured as part of the first arc-shaped groove;

[0016] A second end cavity is formed at the other end of the inverter and at the second arcuate groove, the second end cavity being configured as part of the second arcuate groove.

[0017] Optionally, the first end cavity and the second end cavity are arranged symmetrically about the inverter.

[0018] Optional, also including respectively:

[0019] Two first chamfers are provided on both sides of the nut;

[0020] Two second chamfers are provided on both sides of the nut.

[0021] Optionally, the ball bearing is made of steel.

[0022] Beneficial effects:

[0023] (1) Since several raceways are not connected to each other, each raceway can be used to accommodate a set of balls. This not only ensures that all raceways are used when the balls are circulating, thus avoiding waste of raceways, but also prevents balls from being installed in unused raceways during assembly, thus avoiding problems such as ball jamming and overheating.

[0024] (2) The reverser in this scheme is an integral type, which makes it easy to ensure high efficiency in the processing and assembly of the reverser; the connecting channel is used to connect the beginning and end of the raceway, so that a group of balls can spirally roll in the raceway and the connecting channel. The number of connecting channels is equal to the number of raceways. Attached Figure Description

[0025] Figure 1 This is one of the schematic diagrams of a ball screw nut structure according to Embodiment 1 of this utility model;

[0026] Figure 2 This is a second schematic diagram of a ball screw nut structure according to Embodiment 1 of this utility model;

[0027] Figure 3 This is a partial view of a ball screw nut structure according to Embodiment 1 of this utility model;

[0028] Figure 4 This is a second partial view of a ball screw nut structure according to Embodiment 1 of this utility model;

[0029] Figure 5 This is a third partial view of a ball screw nut structure according to Embodiment 1 of this utility model;

[0030] In the diagram: 1. Nut; 11. Raceway; 12. Receiving groove; 121. First arc-shaped groove; 1211. First end cavity; 122. Second arc-shaped groove; 1221. Second end cavity; 123. Rectangular groove; 13. First chamfer; 14. Second chamfer; 2. Lead screw; 3. Ball bearing; 4. Reversing device; 41. Connecting track. Detailed Implementation

[0031] To make the technical solution of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the utility model. Furthermore, it should be noted that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings. The terms "first," "second," etc., used in this utility model are provided for the convenience of describing the technical solution of this utility model and have no specific limiting effect; they are all general terms and do not constitute a limitation on the technical solution of this utility model. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not contradict or conflict, all of which are within the scope of protection claimed by this utility model.

[0033] Example 1

[0034] like Figures 1-5This embodiment provides a ball screw nut structure, including: a nut 1; several raceways 11 all disposed within the nut 1 and not connected to each other; a screw 2 movably sleeved within the nut 1; and several sets of balls 3, each set of balls 3 rolling within the raceway 11, and each set of balls 3 being located between the nut 1 and the screw 2.

[0035] Specifically, the nut 1 and the lead screw 2 are in a movable fit, which facilitates the conversion of rotary motion into linear motion. Since the several raceways 11 are not interconnected, each raceway 11 is used to accommodate a set of balls 3. This not only ensures that all raceways 11 are used during the circulation of balls 3, thus avoiding waste of raceways 11, but also prevents balls 3 from being installed in unused raceways 11 during assembly, thereby avoiding problems such as ball 3 jamming and overheating. The number of raceways 11 is not limited and can be three, four, etc. The number of sets of balls 3 is equal to the number of raceways 11. The specific number of balls 3 in each set of balls 3 is not limited and can be determined according to the size of balls 3, the size of raceways 11, etc. The material of balls 3 can be high carbon chromium bearing steel, stainless steel, etc.

[0036] Furthermore, such as Figures 4-5 It also includes a reversing device 4 connected to the nut 1. The reversing device 4 is provided with a plurality of connecting channels 41, which are connected between the beginning and end of the raceway 11. At least part of the rolling of each set of balls 3 is located within the connecting channel 41.

[0037] Specifically, the reverser 4 in this solution is an integral type, which makes it easy to ensure high efficiency in the processing and assembly of the reverser 4; the connecting channel 41 is used to connect the first end and the last end of the raceway 11, so that a group of balls 3 can spirally roll in the raceway 11 and the connecting channel 41. The number of connecting channels 41 is equal to the number of raceways 11.

[0038] Furthermore, such as Figures 4-5 It also includes a receiving groove 12 located inside the nut 1, and the reverser 4 is connected inside the receiving groove 12.

[0039] Specifically, the receiving groove 12 is used to receive the reverser 4 to prevent the reverser 4 from protruding excessively from the inner surface of the nut 1. The connection between the reverser 4 and the nut 1 is preferably a snap-fit.

[0040] Furthermore, such as Figures 4-5 The receiving groove 12 includes a rectangular groove 123 and a first arc groove 121 and a second arc groove 122 respectively connected to the two ends of the rectangular groove 123. The reverser 4 is located in the rectangular groove 123, the first arc groove 121 and the second arc groove 122, and the two sides of the reverser 4 abut against the two sides of the rectangular groove 123 respectively.

[0041] Specifically, the rectangular groove 123, the first arc groove 121, and the second arc groove 122 are all used to accommodate the reverser 4. Since the two sides of the reverser 4 abut against the two sides of the rectangular groove 123 respectively, it is easy for the reverser 4 and the accommodating groove 12 to be engaged through surface contact, thereby making it easy to have strong load-bearing capacity, uniform stress distribution, and good stability.

[0042] Furthermore, such as Figures 4-5 It also includes: a first end cavity 1211 formed at one end of the inverter 4 and at the first arc groove 121, the first end cavity 1211 being configured as part of the first arc groove 121; and a second end cavity 1221 formed at the other end of the inverter 4 and at the second arc groove 122, the second end cavity 1221 being configured as part of the second arc groove 122.

[0043] Specifically, the first end cavity 1211 and the second end cavity 1221 facilitate the increase of the assembly fault tolerance of the reverser 4, thereby facilitating the fit between the reverser 4 and the receiving groove 12; the first end cavity 1211 and the second end cavity 1221 facilitate the accommodation of disassembly tools such as wrenches, thereby facilitating the disassembly of the reverser 4 and the nut 1.

[0044] Furthermore, such as Figures 4-5 The first end cavity 1211 and the second end cavity 1221 are arranged symmetrically about the inverter 4.

[0045] Specifically, the axisymmetric design facilitates good force symmetry at both ends of the inverter 4, thereby improving the working stability of the inverter 4.

[0046] Furthermore, such as Figure 1 , Figures 4-5 It also includes: two first chamfers 13 located inside both sides of the nut 1; and two second chamfers 14 located outside both sides of the nut 1.

[0047] Specifically, the first chamfer 13 and the second chamfer 14 facilitate assembly improvement and reduce stress concentration.

[0048] Furthermore, such as Figure 1 , Figures 4-5 The ball bearing 3 is made of steel.

[0049] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A ball screw nut structure characterized by, The utility model relates to a nut (1); A plurality of raceways (11) are arranged in the nut (1) and are not communicated with each other; A lead screw (2) is movably sleeved in the nut (1); A plurality of groups of rolling balls (3) are arranged, each group of the rolling balls (3) is arranged to roll in the raceway (11), and each group of the rolling balls (3) is arranged between the nut (1) and the lead screw (2). The utility model further comprises a reverser (4) connected to the nut (1), the reverser (4) is provided with a plurality of connecting channels (41), the connecting channels (41) are communicated between the front end and the tail end of the raceway (11), and at least part of each group of the rolling balls (3) rolls in the connecting channel (41).

2. A ball screw nut structure according to claim 1, wherein The utility model further comprises a containing groove (12) arranged in the nut (1), and the reverser (4) is connected to the containing groove (12).

3. A ball screw nut structure according to claim 2, wherein The containing groove (12) comprises a rectangular groove (123) and a first arc-shaped groove (121) and a second arc-shaped groove (122) communicated with two ends of the rectangular groove (123) respectively, the reverser (4) is arranged in the rectangular groove (123), the first arc-shaped groove (121) and the second arc-shaped groove (122), and two side surfaces of the reverser (4) abut against two side surfaces of the rectangular groove (123) respectively.

4. A ball screw nut structure according to claim 3, wherein The utility model further comprises:

5. A ball screw nut structure according to claim 4, wherein A first end cavity (1211) formed at one end of the reverser (4) and the first arc-shaped groove (121), the first end cavity (1211) is configured as part of the first arc-shaped groove (121); A second end cavity (1221) formed at the other end of the reverser (4) and the second arc-shaped groove (122), the second end cavity (1221) is configured as part of the second arc-shaped groove (122). The first end cavity (1211) and the second end cavity (1221) are arranged in axial symmetry with respect to the reverser (4).

6. A ball screw nut structure according to claim 5, wherein The utility model further comprises respectively:

7. A ball screw nut arrangement according to any one of claims 1 to 6, wherein, Two first chamfers (13) arranged in two sides of the nut (1); Two second chamfers (14) arranged outside two sides of the nut (1). The rolling balls (3) are made of steel.

8. A ball screw nut arrangement according to any one of claims 1 to 6, wherein, ​

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