Snap-in mounting structure of intermediate circulating component and ball screw having the same

Abstract

The application relates to the technical field of ball screws, in particular to a buckle type mounting structure of a middle circulating component and a ball screw with the same, which is used for mounting the middle circulating component on the outer side wall of a nut, the middle circulating component is inserted on the nut along the Y-axis direction through a mounting hole, the buckle type mounting structure comprises at least one fixed sheet, the fixed sheet is inserted on the nut through a limiting through hole, the fixed sheet penetrates through the limiting through hole and extends into the mounting hole to be connected with the middle circulating component, and a cover plate is arranged on the middle circulating component and the fixed sheet to limit the displacement of the middle circulating component and the fixed sheet. The middle circulating component is mounted through the mutual buckling of the elastic cover plate and the fixed sheet, screws and other parts are not needed in the mounting process, the mounting is convenient, the cost is low, and the mounting efficiency of the middle circulating component can be greatly improved.

Description

Technical Field

[0001] This application relates to the field of ball screw technology, and more particularly to a snap-fit ​​mounting structure for an intermediate circulation component and a ball screw having the same. Background Technology

[0002] With the continuous improvement of industrialization, the demand for high-speed, long-life, and easy-to-install ball screws is constantly increasing in automated equipment, industrial robots, and machining centers. Currently, ball screw preloading methods are mainly divided into large-ball preloading and offset preloading. Offset preloading has a better service life than large-ball preloading, so existing technology mainly uses the single-nut offset preloading method. Single-nut offset preloading requires at least two circulation loops, thus necessitating a slot in the nut for installing intermediate circulation components. Current technology primarily installs these intermediate circulation components by pressing them down with a cover plate on the outside and then fixing them with screws. Screw fixing is slow and requires specialized tools such as torque wrenches, significantly increasing the assembly time of the ball screw. Utility Model Content

[0003] The technical problem this invention aims to solve is that the existing installation methods for intermediate circulation components are time-consuming and cumbersome.

[0004] Therefore, this utility model provides a snap-fit ​​mounting structure for an intermediate circulation component and a ball screw having therein.

[0005] The technical solution adopted by this utility model to solve its technical problem is: A snap-fit ​​mounting structure for an intermediate circulation component is provided for mounting the intermediate circulation component on the outer wall of a nut. The intermediate circulation component is inserted into the nut along the Y-axis direction through a mounting hole. At least one fixing piece is inserted into the nut through a limiting through hole, and the fixing piece extends through the limiting through hole and into the mounting hole to be inserted into the intermediate circulation component.

[0006] Furthermore, the fixing plate is provided with an anti-slip part, which is located at the end of the fixing plate away from the intermediate circulation component.

[0007] Furthermore, it also includes a cover plate, which covers the intermediate circulation component and the fixing plate. The cover plate is made of elastic material and has multiple inserts, which are inserted into nuts to fix the relative position between the cover plate and the nuts.

[0008] Furthermore, the cover plate has a pressing part, which is disposed in close contact with the bottom wall of the receiving groove. A first insert is disposed on the pressing part, which is engaged with a nut to restrict the cover plate from moving along the insertion direction of the intermediate circulation component.

[0009] Furthermore, the cover plate has a limiting portion that abuts against the side of the fixing piece away from the intermediate circulation component to prevent the fixing piece from coming off the nut.

[0010] Furthermore, a second insert is provided on the limiting part, which is engaged with the nut to restrict the movement of the limiting part along the insertion direction between the fixing plate and the intermediate circulation component.

[0011] Furthermore, the nut is provided with a receiving groove, which communicates with the mounting hole. The opening of the mounting hole is located on the bottom wall of the receiving groove, and the side wall of the receiving groove is provided with a first mounting groove for inserting the first plug-in.

[0012] Furthermore, a limiting groove for accommodating the limiting part is provided on the bottom wall of the receiving groove away from the axis of the nut, and a second mounting groove for inserting the second plug is provided on the bottom wall of the limiting groove.

[0013] Furthermore, the limiting through hole is located above the bottom wall of the limiting groove.

[0014] Furthermore, at least one of the fixing piece and the cover plate is provided with a slot, which allows other disassembly tools to be inserted to pry out the fixing piece or the cover plate.

[0015] A ball screw, comprising: Lead screw, and The nut is threaded into the lead screw, and a spiral groove is provided between the nut and the lead screw for rolling of several balls; An end recirculator, wherein the end recirculator is embedded in the end of the nut; The intermediate circulation component is mounted on the side wall of the nut via a snap-fit ​​mounting structure as described above.

[0016] Furthermore, the intermediate circulation component includes a first circulation section and a second circulation section. The first circulation section is provided with a first mating surface, and the second circulation section is provided with a second mating surface. The first circulation section and the second circulation section are assembled into a complete intermediate circulation component through the first mating surface and the second mating surface. A first groove is provided on the first mating surface, and a second groove is provided on the second mating surface. The first groove and the second groove together form a circulation groove, and the circulation groove is connected to the spiral channel.

[0017] Furthermore, both the first and second mating surfaces are parallel to the YZ plane.

[0018] Furthermore, at least one pair of matching positioning grooves and positioning blocks are provided between the first and second mating surfaces.

[0019] Furthermore, the intermediate circulation component has a mounting portion, an insertion portion, and a lip portion. The insertion portion is located between the mounting portion and the lip portion. After the intermediate circulation component is installed into the mounting hole, the end face of the mounting portion away from the insertion portion is flush with the bottom wall of the receiving groove.

[0020] 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. A limiting boss is provided on the second limiting surface. A third limiting surface is provided on the side of the limiting boss away from the mounting part. A first abutting surface, a second abutting surface, and a third abutting surface are provided in the mounting hole, respectively adapted to the first limiting surface, the second limiting surface, and the third limiting surface. A support surface is also provided in the mounting hole, adapted to the end face of the insertion part of the first circulation part away from the mounting part. The intermediate circulation part is limited by the cooperation of the limiting surface and the abutting surface, and the cooperation of the upper end face of the first circulation part and the support surface.

[0021] The beneficial effects of this utility model are that the intermediate circulation component is installed by the interlocking of the elastic cover plate and the fixing plate. No screws or other parts are required during the installation process, making the installation convenient and cost-effective. This greatly improves the installation efficiency of the intermediate circulation component, and there are no other exposed parts in the appearance. Compared with the exposed screws in the prior art, this helps to maintain the integrity of the appearance. Furthermore, the cooperation between the fixing plate, the plug and the groove on the nut can restrict the position of the intermediate circulation component and improve the stability of the installation. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of the ball screw structure in this utility model.

[0024] Figure 2 This is a schematic diagram of the nut structure in this utility model.

[0025] Figure 3 This is a schematic diagram of the structure of the fixing piece in Embodiment 1 of this utility model.

[0026] Figure 4 This is a schematic diagram of the cover plate in Embodiment 1 of this utility model.

[0027] Figure 5 This is a schematic diagram showing the position of the limiting through hole in this utility model.

[0028] Figure 6 This is a schematic diagram of the installation structure of the intermediate circulation component in this utility model.

[0029] Figure 7 This is a schematic diagram of the installation structure of the fixing plate and cover plate in this utility model.

[0030] Figure 8 This is a schematic diagram of the structure of the first circulation section in this utility model.

[0031] Figure 9 This is a schematic diagram of the structure of the second circulation section in this utility model.

[0032] Figure 10 This is a schematic diagram of the cover plate in Embodiment 2 of this utility model.

[0033] Figure 11 This is a schematic diagram of the structure of the fixing piece in Embodiment 3 of this utility model.

[0034] In the diagram: 1. Lead screw; 2. Nut; 21. Mounting hole; 211. Support surface; 22. Receiving groove; 23. Limiting groove; 24. First mounting groove; 25. Second mounting groove; 26. Limiting through hole; 3. End circulator; 4. Pressure cap; 5. Intermediate circulation component; 51. First circulation part; 511. First mating surface; 512. First positioning groove; 513. Second positioning block; 514. Positioning slot; 515. Limiting protrusion; 52. Second circulation part; 521. Second mating surface; 522. First positioning block; 523. Second positioning groove; 53. Mounting part; 54. Insertion part; 55. Lip; 56. First limiting surface; 57. Second limiting surface; 58. Limiting boss; 59. Third limiting surface; 6. Fixing piece; 61. Anti-slip part; 62. Slot; 7. Cover plate; 71. Pressing part; 72. Limiting part; 73. First insert; 74. Second insert. Detailed Implementation

[0035] 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 present invention, and therefore only show the components relevant to the present invention.

[0036] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this 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 of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 utility model based on the specific circumstances.

[0038] Example 1 Reference Figure 1 A ball screw 1 includes a screw 1, a nut 2, an end circulator 3, a pressure cap 4, and an intermediate circulation component 5. The nut 2 is threadedly engaged with the screw 1, and a helical groove is provided between the nut 2 and the screw 1 for a number of balls to roll. The end circulator 3 is embedded at both ends of the nut 2 and fixed by the pressure cap 4. The pressure cap 4 is fixed to the nut 2 by screws. The number of intermediate circulation components 5 is adapted to the number of end circulators 3. The intermediate circulation components 5 are installed on the side wall of the nut 2 by a snap-on installation structure. The side wall of the nut 2 is provided with mounting holes 21 for installing the intermediate circulation components 5.

[0039] Reference Figure 2 The snap-fit ​​installation structure of the intermediate circulation component 5 includes a slot structure, a fixing piece 6 and a cover plate 7 set on the nut 2. The slot structure includes a receiving groove 22, a first mounting groove 24, a second mounting groove 25 and a limiting through hole 26.

[0040] The receiving groove 22 communicates with the mounting hole 21 and is located on the side of the mounting hole 21 near the outer wall of the nut 2. The opening of the mounting hole 21 is located on the bottom wall of the receiving groove 22. With the direction of the intermediate circulation component 5 inserted into the mounting hole 21 as the Y direction and the axial direction of the nut 2 as the Z direction, the groove opening of the receiving groove 22 is opposite to the Y direction. The bottom wall of the receiving groove 22 is parallel to the XZ plane. The receiving groove 22 has a side wall parallel to the YZ plane, which is defined as the positioning surface. The positioning surface is located on the side of the receiving groove 22 near the axis of the nut 2. The first mounting groove 24 is set on the positioning surface and is set near the bottom wall of the receiving groove 22.

[0041] A limiting groove 23 is provided on the bottom wall of the receiving groove 22 on the side away from the positioning surface. The limiting groove 23 penetrates the outer edge of the nut 2. The bottom wall of the limiting groove 23 is perpendicular to the Y direction. The limiting groove 23 has a side wall parallel to the YZ plane, which is defined as the connecting surface. A second mounting groove 25 is provided on the bottom wall of the limiting groove 23 near the connecting surface. A limiting through hole 26 is provided on the connecting surface. The limiting through hole 26 connects the mounting hole 21 and the second mounting groove 25. It should be noted that the limiting through hole 26 is located above the bottom wall of the limiting groove 23 (the direction of the Y axis away from the axis of the nut 2 is positive, and the positive direction of the Y axis is up).

[0042] like Figure 2 , 3 As shown, a positioning slot 514 is provided on the side wall of the intermediate circulation component 5 opposite to the limiting through hole 26, and the fixing piece 6 passes through the limiting through hole 26 and is inserted into the positioning slot 514.

[0043] like Figure 4 As shown, the cover plate 7 is made of an elastic material and is L-shaped. The cover plate 7 includes a pressing part 71 and a limiting part 72. A first insert 73 is provided on the pressing part 71, which is inserted into the side wall of the receiving groove 22 to limit the displacement of the cover plate 7 along the Y direction. A second insert 74 is provided on the limiting part 72, which is inserted into the nut 2 and can limit the movement of the cover plate 7 along the X-axis. Preferably, the shape of the pressing part 71 is adapted to the bottom shape of the receiving groove 22.

[0044] Reference Figure 5-7 In this embodiment, the end of the pressing part 71 away from the limiting part 72 is provided with a first insert 73 that can be inserted into the first mounting groove 24. The limiting part 72 is embedded in the limiting groove 23. The side of the fixing piece 6 away from the limiting groove 23 abuts against the side wall of the limiting part 72 near the first mounting groove 24. The limiting part 72 is provided with a second insert 74 that can be locked into the second mounting groove 25. One side of the second insert 74 abuts against the side wall of the second mounting groove 25 away from the limiting through hole 26, and the other side abuts against the fixing piece 6. Thus, the limiting part 72 presses the fixing piece 6 into the limiting through hole 26, and neither the fixing piece 6 nor the cover plate 7 will move along the X-axis direction. Along the Z-axis direction, the width of the cover plate 7 matches the width of the receiving groove 22, thereby restricting the movement of the cover plate 7 along the Z-axis direction. The pressing part 71 presses the intermediate circulation component 5 into the mounting hole 21 through the first mounting groove 24, restricting its displacement along the Y-axis direction.

[0045] Furthermore, a slot 62 can be provided on the upper end surface of the fixing piece 6 and the limiting part 72. When disassembling, a tool can be inserted into the slot 62 to pry the part out, which facilitates disassembly.

[0046] Specifically, in this application, the intermediate circulation component 5 is configured as separate parts, including a first circulation part 51 and a second circulation part 52. The first circulation part 51 has a first mating surface 511, and the second circulation part 52 has a second mating surface 521. The first circulation part 51 and the second circulation part 52 are assembled into the intermediate circulation component 5 through the first mating surface 511 and the second mating surface 521. Both the first mating surface 511 and the second mating surface 521 are parallel to the YZ plane. The first mating surface 511 has a first groove, and the second mating surface 521 has a second groove. The first groove and the second groove together form a circulation groove, which is connected to the spiral channel. The intermediate circulation component 5 has a mounting part 53, an insertion part 54, and a lip 55. The insertion part 54 is located between the mounting part 53 and the lip 55. After the intermediate circulation component 5 is installed into the mounting hole 21, the end face of the mounting part 53 away from the insertion part 54 is flush with the bottom wall of the receiving groove 22.

[0047] Reference Figure 8 , 9 , Figure 8 In the figures (a) and (b), the smaller figures are views of the front and back of the first loop section 51, respectively. Figure 9 Figures (a) and (b) are views of the front and back of the second circulation section 52, respectively. In this embodiment, the first circulation section 51 is located near the limiting through hole 26, and the positioning slot 514 is located on the side wall of the first circulation section 51 away from the first mating surface 511. The groove of the positioning slot 514 can also offset the upward impact of the steel ball on the intermediate circulation component 5. A limiting protrusion 515 is provided on the first mating surface 511, and the limiting protrusion 515 abuts against the bottom of the second circulation section 52. The second circulation section 52 is provided with a lip 55 that transitions with the spiral channel.

[0048] At least one pair of matching positioning grooves and positioning blocks are provided between the first mating surface 511 and the second mating surface 521. In this embodiment, two pairs of positioning grooves and positioning blocks are provided between the first mating surface 511 and the second mating surface 521. The first positioning groove 512 and the second positioning block 513 are provided on the first mating surface 511, and the first positioning block 522 and the second positioning groove 523 are provided on the second mating surface 521. The first positioning block 522 is inserted into the first positioning groove 512, and the second positioning block 513 is inserted into the second positioning groove 523. The shape of the positioning blocks is not limited.

[0049] Furthermore, the mounting portion 53 has a first limiting surface 56 and a second limiting surface 57 on the side facing the insertion portion 54. The first limiting surface 56 and the second limiting surface 57 are staggered along the Y-axis. A limiting boss 58 is provided on the second limiting surface 57. The limiting boss 58 is divided into two parts by the mating surface, located on the first circulation portion 51 and the second circulation portion 52 respectively. A third limiting surface 59 is provided on the side of the limiting boss 58 away from the mounting portion 53. Furthermore, the limiting boss 58 can also serve as a reinforcing rib between the mounting portion 53 and the insertion portion 54, reinforcing the thickness of this part and enhancing the strength of the intermediate circulation component 5.

[0050] The mounting hole 21 is provided with a first abutting surface, a second abutting surface, and a third abutting surface that are respectively adapted to the first limiting surface 56, the second limiting surface 57, and the third limiting surface 59. The mounting hole 21 is also provided with a support surface 211 that is adapted to the end face of the insertion part 54 on the first circulation part 51 away from the mounting part 53. The intermediate circulation part is limited by the cooperation of the limiting surface and the abutting surface, and the cooperation of the upper end face of the first circulation part 51 and the support surface 211.

[0051] Example 2 The difference from Embodiment 1 is that the first mounting groove 24 is disposed on two opposite side walls inside the receiving groove 22, and the first plug-in 73 on the cover plate 7 is disposed on the side wall of the cover plate 7 opposite to the Z-axis direction, and the first plug-in 73 is inserted into the first mounting groove 24.

[0052] Example 3 The difference from embodiments 1 and 2 is that the fixing plate 6 may be provided with an anti-slip part 61. The anti-slip part 61 is provided on the end of the fixing plate 6 away from the intermediate circulation component 5, thereby increasing the friction when the fixing plate 6 is pulled out. The anti-slip part 61 may be multiple anti-slip protrusions or anti-slip grooves. In this embodiment, multiple anti-slip grooves are provided, and the multiple anti-slip grooves are arranged parallel to each other.

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

Claims

1. A snap-fit ​​mounting structure for an intermediate circulation component, used to mount an intermediate circulation component (5) on the outer side wall of a nut (2), wherein the intermediate circulation component (5) is inserted into the nut (2) along the Y-axis direction through a mounting hole (21), characterized in that, include, At least one fixing piece (6) is inserted into the nut (2) through a limiting through hole (26). The fixing piece (6) passes through the limiting through hole (26) and extends into the mounting hole (21) to be inserted into the intermediate circulation component (5).

2. The snap-fit ​​installation structure of the intermediate circulation component according to claim 1, characterized in that, The fixing plate (6) is provided with an anti-slip part (61), which is located at the end of the fixing plate (6) away from the intermediate circulation component (5).

3. The snap-fit ​​installation structure of the intermediate circulation component according to claim 1, characterized in that, It also includes a cover plate (7), which covers the intermediate circulation component (5) and the fixing piece (6). The cover plate (7) is made of elastic material and has multiple plugs. The plugs are inserted into the nut (2) to fix the relative position between the cover plate (7) and the nut (2).

4. The snap-fit ​​installation structure of the intermediate circulation component according to claim 3, characterized in that, The cover plate (7) has a pressing part (71) which is closely attached to the bottom wall of the receiving groove (22). A first insert (73) is provided on the pressing part (71). The first insert (73) is inserted into and cooperates with the nut (2) to restrict the cover plate (7) from moving along the insertion direction of the intermediate circulation component (5).

5. The snap-fit ​​installation structure of the intermediate circulation component according to claim 3, characterized in that, The cover plate (7) has a limiting part (72) that abuts against the side of the fixing piece (6) away from the intermediate circulation component (5) to prevent the fixing piece (6) from coming off the nut (2).

6. The snap-fit ​​installation structure of the intermediate circulation component according to claim 5, characterized in that, The limiting part (72) is provided with a second plug (74), which is engaged with the nut (2) to restrict the movement of the limiting part (72) along the insertion direction between the fixing piece (6) and the intermediate circulation component (5).

7. The snap-fit ​​installation structure of the intermediate circulation component according to claim 6, characterized in that, The nut (2) is provided with a receiving groove (22), which is connected to the mounting hole (21). The opening of the mounting hole (21) is located on the bottom wall of the receiving groove (22), and a first mounting groove (24) for the first plug-in (73) to be inserted is provided on the side wall of the receiving groove (22).

8. The snap-fit ​​installation structure of the intermediate circulation component according to claim 7, characterized in that, The bottom wall of the receiving groove (22) is provided with a limiting groove (23) for accommodating the limiting part (72) on the side away from the axis of the nut (2), and a second mounting groove (25) for the second plug-in (74) to be inserted is provided on the bottom wall of the limiting groove (23).

9. The snap-fit ​​installation structure of the intermediate circulation component according to claim 7, characterized in that, The limiting through hole (26) is located above the bottom wall of the limiting groove (23).

10. The snap-fit ​​installation structure of the intermediate circulation component according to claim 3, characterized in that, At least one of the fixing piece (6) and the cover plate (7) is provided with a slot (62), which is used for other disassembly tools to pry out the fixing piece (6) or the cover plate (7).

11. A ball screw, comprising: Lead screw (1), and Nut (2), the nut (2) is threadedly engaged with lead screw (1), and a spiral groove is provided between the nut (2) and lead screw (1) for several balls to roll; End circulator (3), which is embedded in the end of nut (2); Its characteristic is that it further includes: Intermediate circulation component (5) is mounted on the side wall of nut (2) by means of a snap-fit ​​mounting structure of intermediate circulation component (5) as described in any one of claims 1-10.

12. The ball screw according to claim 11, characterized in that, The intermediate circulation component (5) includes a first circulation part (51) and a second circulation part (52). The first circulation part (51) is provided with a first mating surface (511), and the second circulation part (52) is provided with a second mating surface (521). The first circulation part (51) and the second circulation part (52) are assembled into a complete intermediate circulation component (5) through the first mating surface (511) and the second mating surface (521). The first mating surface (511) is provided with a first groove, and the second mating surface (521) is provided with a second groove. The first groove and the second groove together form a circulation groove, and the circulation groove is connected to the spiral channel.

13. The ball screw according to claim 12, characterized in that, Both the first mating surface (511) and the second mating surface (521) are parallel to the YZ plane.

14. The ball screw according to claim 12, characterized in that, At least one pair of matching positioning grooves and positioning blocks are provided between the first mating surface (511) and the second mating surface (521).

15. The ball screw according to claim 11, characterized in that, The intermediate circulation component (5) has a mounting part (53), an insertion part (54) and a lip (55). The insertion part (54) is located between the mounting part (53) and the lip (55). After the intermediate circulation component (5) is installed into the mounting hole (21), the end face of the mounting part (53) away from the insertion part (54) is flush with the bottom wall of the receiving groove (22).

16. The ball screw according to claim 15, characterized in that, The mounting part (53) is provided with a first limiting surface (56) and a second limiting surface (57) on the side facing the insertion part (54). The first limiting surface (56) and the second limiting surface (57) are staggered along the Y-axis. A limiting boss (58) is provided on the second limiting surface (57). A third limiting surface (59) is provided on the side of the limiting boss (58) away from the mounting part (53). A first abutting surface, a second abutting surface, and a third abutting surface are provided in the mounting hole (21) respectively adapted to the first limiting surface (56), the second limiting surface (57), and the third limiting surface (59). A support surface (211) is also provided in the mounting hole (21) adapted to the end face of the insertion part (54) on the first circulation part (51) away from the mounting part (53). The intermediate circulation part is limited by the cooperation of the limiting surface and the abutting surface, and the cooperation of the upper end face of the first circulation part (51) and the support surface (211).

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