Mounting structure of intermediate circulation component for high-speed ball screw

Abstract

The invention relates to the technical field of ball screws, in particular to a mounting structure of an intermediate circulation component for a high-speed ball screw, the high-speed ball screw comprises a screw body and a nut, and the nut coaxially sleeves the screw body and is in threaded fit with the screw body; the two end plugs are arranged at the two ends of the nut respectively; the middle circulation components are inserted into the side wall of the nut, the number of the middle circulation components is matched with the number of the end plugs arranged at the end of the nut, each middle circulation component is provided with a return channel, one return channel and one end plug form a circulation roller path, the two middle circulation components are located on the same lead, and the two end plugs are located on the same lead. An included angle of 0 degree lt is formed between the installation directions of the inserted nuts; gamma lt; and 180 degrees. The two middle circulation components are installed at the interval angle, so that the invalid channel between the two columns of circulation paths is minimum under the condition that the strength requirement of the nut is guaranteed, it is guaranteed that the nut is compact in the axial direction, and the axial length of the nut is shortened.

Description

Technical Field

[0001] This application relates to the field of ball screw technology, and more particularly to an installation structure for an intermediate circulation component for a high-speed ball screw. Background Technology

[0002] With the continuous improvement of industrialization, the demand for high-speed, long-life ball screws in automated equipment is constantly increasing. In ball screws, the path of the steel ball through-hole formed in the nut is parallel to the axis of the nut. In order for the steel ball to roll smoothly in the circulation path, it is necessary to change the angle connecting the through-hole and the direction conversion. Existing technical solutions require changing the angle of the intermediate circulation component's mounting groove to insert and install the intermediate circulation component into different angle direction conversion paths. For ease of processing, the insertion direction of the intermediate circulation component is usually made uniform in the same direction, which makes the ineffective channel of the nut longer and the overall axial dimension larger. Summary of the Invention

[0003] The technical problem to be solved by this invention is that the existing ball screw has a long ineffective groove and a large axial dimension of the nut.

[0004] Therefore, the present invention provides an mounting structure for an intermediate circulation component for a high-speed ball screw.

[0005] The technical solution adopted by this invention to solve its technical problem is: A mounting structure for an intermediate circulation component of a high-speed ball screw, the high-speed ball screw comprising, The lead screw body, and Nut, which is coaxially sleeved on the lead screw body and threadedly engaged with the lead screw body; Two end plugs, each disposed at one end of the nut; An intermediate circulation component is inserted into the side wall of the nut. The number of intermediate circulation components is adapted to the number of end plugs provided at the end of the nut. Each intermediate circulation component is provided with a return channel. One return channel and one end plug form a circulation raceway. Two intermediate circulation components are located on the same lead, and there is an included angle γ between the installation directions of the insertion into the nut, where 0° < γ < 180°.

[0006] Furthermore, the intermediate circulation component is mounted on the side wall of the nut through mounting holes, and the wall thickness B between the two mounting holes is greater than 1 mm.

[0007] Furthermore, the wall thickness B between the two mounting holes satisfies , Let K and V be the arc length of the portion between the two mounting holes on the outer circle of the nut in the XY plane, and K and V be correction coefficients.

[0008] Furthermore, the arc length ,in α is the nut suction point angle of the ball screw, and β is the rotation angle of the circulating track; Let be an angle in triangle COD, where point D is the edge node of one mounting hole near another mounting hole in the XY plane, point O is the nut axis, and a tangent f is drawn at the nut suction point of the ball screw to the circle containing the nut pitch circle diameter. The tangent f passes through the shaft hole position Y of the end plug. A tangent g is drawn through point Y to the circle containing the nut pitch circle diameter. A line h parallel to the tangent g is drawn through the edge node D. The intersection point between line h and the nut diameter is C.

[0009] Furthermore, in the triangular COD Where H2 is the pitch circle diameter of the nut, H1 is the outer diameter of the nut, and B2 is the width of the mounting hole in the XZ plane.

[0010] Furthermore, the intermediate circulation part includes a mounting part, a lip, and an insertion part disposed between the mounting part and the lip. The intermediate circulation component is provided with a return channel. The intermediate circulation component is disposed separately. The intermediate circulation component is divided into a first circulation part and a second circulation part by a splicing surface. The splicing surface divides the return channel into two grooves.

[0011] Furthermore, the lip portion or all of it is located on the second circulation portion.

[0012] Furthermore, the splicing surface includes a first splicing surface and a second splicing surface. The first splicing surface is disposed on the first circulation part, and the second splicing surface is disposed on the second circulation part. A slot is disposed on the first splicing surface, and an insert is disposed on the second splicing surface. The insert and the slot are inserted and engaged.

[0013] Furthermore, a limiting boss is provided on the first splicing surface, and the limiting boss abuts against the end face of the second circulation part.

[0014] Furthermore, the mounting part is provided with a first limiting surface and a second limiting surface on the side facing the insertion part. The first limiting surface and the second limiting surface are staggered along the Y-axis direction. The mounting hole is provided with a first abutting surface and a second abutting surface that are respectively adapted to the first limiting surface and the second limiting surface.

[0015] The beneficial effect of this invention is that, in this application, the two intermediate circulation components are installed at an angle along the radial direction of the nut. This angled installation minimizes the ineffective channels between the two circulation paths while ensuring the strength of the nut, ensuring a compact axial direction and reducing the axial length of the nut. Therefore, the combination of the intermediate circulation components and the end circulator allows for more than two axial loops, further shortening the axial loop length.

[0016] Furthermore, in this application, the intermediate circulation component is configured as a separate unit, allowing the ball screw to install steel balls from the intermediate circulation component and radially from the nut. The steel balls, due to gravity, can move radially, facilitating radial assembly. Additionally, the segmented design of the intermediate circulation component, with its segmented lip, ensures that after the second circulation unit is installed into the nut, the lip prevents the steel balls from entering ineffective channels, thereby improving the efficiency of steel ball installation. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the high-speed ball screw in Embodiment 1 of the present invention.

[0019] Figure 2 This is a schematic diagram of the mounting hole positions in Embodiment 1 of the present invention.

[0020] Figure 3 This is a schematic diagram of the mounting hole setting angle in Embodiment 1 of the present invention.

[0021] Figure 4 This is a schematic diagram of the location of the invalid channel in Embodiment 1 of the present invention.

[0022] Figure 5 This is a schematic diagram of the nut suction point of the ball screw in Embodiment 1 of the present invention.

[0023] Figure 6 This is a schematic diagram of the installation hole insertion angle design in Embodiment 1 of the present invention.

[0024] Figure 7 This is a schematic diagram of the intermediate circulation component in Embodiment 1 of the present invention.

[0025] Figure 8 This is a schematic diagram of the structure of the first circulation section in Embodiment 1 of the present invention.

[0026] Figure 9 This is a schematic diagram of the structure of the second circulation section in Embodiment 1 of the present invention.

[0027] Figure 10 This is a schematic diagram of the through hole structure in Embodiment 1 of the present invention.

[0028] Figure 11 This is a schematic diagram of the intermediate loop component segmentation method in Embodiment 2 of the present invention.

[0029] In the diagram: 1. Lead screw body; 2. Nut; 21. Mounting hole; 22. Pressure cap; 23. Intermediate pressure plate; 3. End plug; 4. Intermediate circulation component; 41. First circulation part; 411. First mating surface; 412. Slot; 413. Limiting protrusion; 42. Second circulation part; 421. Second mating surface; 422. Insert block; 43. Mounting part; 44. Insertion part; 45. Lip; 46. Through hole; 47. Transition hole; 48. First limiting surface; 49. Second limiting surface. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention 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 of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection 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 invention based on the specific circumstances.

[0033] Example 1 Reference Figure 1 , 2An installation structure for an intermediate circulation component 4 for a high-speed ball screw is disclosed. The high-speed ball screw includes a screw body 1, a nut 2, end plugs 3, and a pressure cap 22. The nut 2 is threadedly engaged with the screw body 1, and a helical groove is provided between the nut 2 and the screw body 1 for rolling of a number of balls. The end plugs 3 are embedded at both ends of the nut 2 and fixed by the pressure cap 22. The pressure cap 22 is fixed to the nut 2 by screws. The number of intermediate circulation components 4 is adapted to the number of end plugs 3. The intermediate circulation components 4 are installed on the side wall of the nut 2. The side wall of the nut 2 is provided with mounting holes 21 for installing the intermediate circulation components 4. The intermediate circulation components 4 are fixed in the mounting holes 21 by an intermediate pressure plate 23. The intermediate pressure plate 23 and the pressure cap 22 are both fixedly connected to the nut 2 by screws.

[0034] Through the cooperation of an intermediate circulation component 4, an end plug 3 and a spiral channel, the high-speed ball screw in this embodiment has two circulation raceways. The balls are reversed through the intermediate circulation component 4, so the balls will not pass through the spiral channel between the two intermediate circulation components 4. The spiral channel between the two intermediate circulation components 4 is an invalid channel.

[0035] To shorten the length of the ineffective channel, in this application, two intermediate circulation components 4 are inserted radially into the nut 2 to achieve the installation of the intermediate circulation components 4. The two intermediate circulation components 4 are located on the same lead, and there is an included angle γ between the installation directions of the two intermediate circulation components 4 inserted into the nut (hereinafter referred to as the included angle between the two intermediate circulation components 4), 0 < γ < 180°. With the axial direction of the nut 2 as the Z-axis direction, the distance between the two intermediate circulation components 4 in the XZ plane is L, which satisfies... , For the guide.

[0036] like Figure 3 , 4 As shown, specifically, if the installation angles of the two intermediate circulation components 4 are the same, such as... Figure 4 As shown in small figure (a), the ineffective channel of nut 2 becomes longer, and the overall axial dimension increases. Taking the axial direction of nut 2 as the Z-axis, the distance between the two mounting holes 21 along the Z-axis in the XZ plane is defined as L1; In this application, as Figure 4 As shown in small figure (b), the included angle between the two intermediate circulation components 4 is γ, and the wall thickness spacing between the mounting holes 21 on the nut 2 for mounting the two intermediate circulation components 4 is B, that is, the distance between the two mounting holes 21 in the XY plane. B is greater than 1mm. In the XZ plane, the distance between the two mounting holes 21 along the Z-axis is defined as L2. .

[0037] When designing the installation angle of the intermediate circulation component 4, it is first known that the angle of the nut 2 suction point of the ball screw is α, the rotation angle of the circulation track is β, the included angle between the two intermediate circulation components 4 is γ, and the interval angle γ of the intermediate circulation components 4 satisfies: .

[0038] Please refer to the following steps for details: Step 1, refer to Figure 5 , 6 Mounting hole 21 is located at the edge node D on the outer circle of nut 2. In the XY plane, with the axis O of nut 2 as the corner point, draw a tangent f to the circle containing the pitch diameter of nut 2 at the suction point of the ball screw nut 2. The intersection of tangent f and the diameter of nut 2 is Y. Point Y is the position of the shaft hole of the end plug 3 in the corresponding circulating raceway. Draw a tangent g to the circle containing the pitch diameter of nut 2 through point Y. Draw a line h parallel to tangent g through the edge node D. Line h is perpendicular to the radial direction of nut 2. The intersection of line h and the diameter of nut 2 is C. In triangle COD... Where H2 is the pitch circle diameter of nut 2, H1 is the outer diameter of nut 2, and B2 is the width of mounting hole 21 in the XZ plane.

[0039] It should be noted that the tangents to the circles containing the pitch circle diameters of nut 2 at the suction point of the two circulating raceways are defined as f1 and f2, respectively, and the midline of f1 and f2 is... l Two mounting holes 21 are symmetrically arranged on the centerline in the XY plane. l Both sides.

[0040] Step 2: Calculate the relationship between the line OD and the centerline. l The included angle φ between them Thus, the arc length between the two corresponding mounting holes 21 l B The projection in the XZ plane is .

[0041] Step 3, Arc Length l B The thickness B between the mounting holes 21 and the wall surface is not directly proportional. Correction factors are set as K and V, and the values ​​of K and V may vary depending on the model. The wall thickness B between the two mounting holes 21 satisfies:

[0042]

[0043]

[0044] For example, for a certain type of ball screw, with K=0.2 and V=-0.12, and based on a ball diameter of 7.144 mm, other parameters are derived: assuming the suction point angle α is 50°. The diameter is 52mm, the width of mounting hole 21 B2 is 16mm, and the outer diameter of nut 2 is... The thickness is 98mm. Assuming the thickness between the walls of the mounting hole 21 is B equal to 1mm, which is at the limit distance, the mounting angle γ between the two intermediate circulation components 4 is 23°, so the range of the interval angle γ is 0-23°.

[0045] Furthermore, such as Figure 7 As shown, the intermediate circulation component 4 includes a mounting part 43, an insertion part 44, and a lip 45. The insertion part 44 is located between the mounting part 43 and the lip 45. The intermediate circulation component 4 is divided into two parts, specifically including a first circulation part 41 and a second circulation part 42. The lip 45 is entirely disposed on the second circulation part 42.

[0046] The intermediate circulation component 4 is provided with a through hole 46 and a transition hole 47, which are interconnected to form a return channel that connects with the spiral channel. For example... Figure 8 , 9 As shown, the first circulation part 41 is provided with a first mating surface 411, and the second circulation part 42 is provided with a second mating surface 421. Both the first mating surface 411 and the second mating surface 421 have a portion that is perpendicular to the direction of the insertion mounting hole 21 of the intermediate circulation component 4.

[0047] like Figure 10 As shown, the first circulation part 41 has a first groove, and the second circulation part 42 has a second groove. In this embodiment, the first groove is composed of a through hole 46 covering three-quarters of the cross-section and a transition hole 47 covering half of the cross-section, and the second groove is composed of a through hole 46 covering one-quarter of the cross-section and a transition hole 47 covering half of the cross-section. It should be noted that the mating surface is located on the side of the top surface of the mounting part 43 near the insertion part 44, thereby maintaining the integrity of the end face of the mounting part 43 away from the insertion part 44 and improving the stability of the intermediate circulation component 4 during installation.

[0048] A slot 412 is provided on the first mating surface 411 for the insertion of the plug 422 provided on the second circulation part 42. A limiting protrusion 413 is provided on the first mating surface 411. The limiting protrusion 413 abuts against the end face of the second circulation part 42 near the lip 45. The cooperation between the limiting protrusion 413 and the slot 412 of the plug 422 together limits the first circulation part 41 and the second circulation part 42, preventing relative displacement between the two circulation parts.

[0049] Furthermore, the mounting part 43 is provided with a first limiting surface 48 and a second limiting surface 49 on the side facing the insertion part 44. The first limiting surface 48 and the second limiting surface 49 are staggered along the Y-axis direction. The mounting hole 21 is provided with a first abutting surface and a second abutting surface that are adapted to the first limiting surface 48 and the second limiting surface 49, respectively. The mounting hole 21 is also provided with a support surface that is adapted to the end face of the insertion part 44 on the first circulation part 41 away from the mounting part 43. There are gaps between the contact surfaces between the abutting surface and the limiting surface, and between the support surface and the end face of the circulation part. The intermediate circulation part is limited by the cooperation of the limiting surface and the abutting surface, and the cooperation of the end face of the first circulation part 41 and the support surface.

[0050] In this application, the two intermediate circulation components are installed radially with an angle between them. This angled installation minimizes the ineffective channels between the two circulation paths while ensuring the strength of the nut 2, thus ensuring the nut 2 is compact in the axial direction and reducing its axial length. Therefore, when the intermediate circulation component 4 is combined with the end circulator, it can have more than two axial loops, further shortening the axial loop length.

[0051] Furthermore, in this application, the intermediate circulation component 4 is configured as a separate part, allowing the ball screw to install steel balls from the intermediate circulation component and radially from the nut 2. The steel balls, due to gravity, can move radially, facilitating radial assembly. Additionally, the intermediate circulation component 4 in this application is divided into a lip 45. This lip 45 prevents the steel balls from entering ineffective channels after the second circulation part 42 is installed into the nut 2, thereby improving the steel ball installation efficiency.

[0052] Example 2 In this embodiment, as Figure 11 As shown, Figure 11 (a) is the first circulation part 41 and (b) is the second circulation part 42. The mating surface divides the lip 45 into two parts. After the second circulation part 42 is placed into the mounting hole 21, the second circulation part 42 also has the lip 45 part. When installing the steel ball, it can prevent the steel ball from entering the invalid channel.

[0053] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined by the scope of the claims.

Claims

1. An mounting structure for an intermediate circulation component of a high-speed ball screw, the high-speed ball screw comprising, The lead screw body (1), and Nut (2), the nut (2) is coaxially sleeved on the lead screw body (1) and threadedly engaged with the lead screw body (1); Two end plugs (3) are respectively disposed at both ends of the nut (2); An intermediate circulation component (4) is inserted into the side wall of the nut (2). The number of intermediate circulation components (4) matches the number of end plugs (3) provided at the end of the nut (2). Each intermediate circulation component (4) is provided with a return channel, and one return channel and one end plug (3) form a circulation raceway. The intermediate circulation component (4) is characterized in that... The two intermediate circulation components (4) are located on the same lead, and there is an included angle γ between the installation directions of the insertion nut (2), where 0° < γ < 180°.

2. The mounting structure of the intermediate circulation component for high-speed ball screws according to claim 1, characterized in that, The intermediate circulation component (4) is mounted on the side wall of the nut (2) through the mounting hole (21), and the wall thickness B between the two mounting holes (21) is greater than 1 mm.

3. The mounting structure of the intermediate circulation component for high-speed ball screws according to claim 2, characterized in that, The wall thickness B between the two mounting holes (21) satisfies , Let K and V be the arc length of the portion between the two mounting holes (21) on the outer circle of the nut (2) in the XY plane, and K and V are correction coefficients.

4. The mounting structure of the intermediate circulation component for high-speed ball screws according to claim 3, characterized in that, The arc length ,in α is the angle of the nut (2) suction point, and β is the rotation angle of the circular track; Let be the angle in triangle COD, where point D is the edge node of one of the mounting holes (21) in the XY plane near another mounting hole (21), point O is the axis of nut (2), and a tangent f is drawn at the suction point of nut (2) to the circle containing the pitch circle diameter of nut (2). The tangent f passes through the shaft hole position Y of end plug (3). A tangent g is drawn through point Y to the circle containing the pitch circle diameter of nut (2). A line h parallel to the tangent g is drawn through the edge node D. The intersection point between line h and the diameter of nut (2) is C.

5. The mounting structure of the intermediate circulation component for high-speed ball screws according to claim 4, characterized in that, In the triangular COD H2 is the pitch circle diameter of nut (2), H1 is the outer diameter of nut (2), and B2 is the width of mounting hole (21) in the XZ plane.

6. The mounting structure of the intermediate circulation component for high-speed ball screws according to claim 1, characterized in that, The intermediate circulation part includes a mounting part (43), a lip (45), and an insertion part (44) disposed between the mounting part (43) and the lip (45). The intermediate circulation component (4) is mounted on the side wall of the nut (2) through the mounting hole (21). The intermediate circulation component (4) is provided with a return channel. The intermediate circulation component (4) is provided separately. The intermediate circulation component (4) is divided into a first circulation part (41) and a second circulation part (42) by a splicing surface. The splicing surface divides the return channel into two grooves.

7. The mounting structure of the intermediate circulation component for high-speed ball screws according to claim 6, characterized in that, The lip (45) is partially or entirely located on the second circulation section (42).

8. The mounting structure of the intermediate circulation component for high-speed ball screws according to claim 6, characterized in that, The splicing surfaces include a first splicing surface (411) and a second splicing surface (421). The first splicing surface (411) is disposed on the first circulation part (41), and the second splicing surface (421) is disposed on the second circulation part (42). A slot (412) is disposed on the first splicing surface (411), and a plug (422) is disposed on the second splicing surface (421). The plug (422) and the slot (412) are inserted and engaged.

9. The mounting structure of the intermediate circulation component for high-speed ball screws according to claim 8, characterized in that, A limiting boss is provided on the first splicing surface (411), and the limiting boss abuts against the end face of the second circulation part (42).

10. The mounting structure of the intermediate circulation component for high-speed ball screws according to claim 6, characterized in that, The mounting part (43) is provided with a first limiting surface (48) and a second limiting surface (49) on the side facing the insertion part (44). The first limiting surface (48) and the second limiting surface (49) are staggered along the Y-axis direction. The mounting hole (21) is provided with a first abutting surface and a second abutting surface that are adapted to the first limiting surface (48) and the second limiting surface (49) respectively.

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