Anti-rotation mechanism of screw and nut

Abstract

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Description

Technical Field

[0001] This invention relates to the field of lead screw-nut transmission pair technology, and particularly to a lead screw-nut anti-rotation mechanism. Background Technology

[0002] Lead screw and nut drive is a common mechanical transmission structure that converts the rotation of the lead screw around its own axis into the linear motion of the lead nut along the lead screw axis. In this transmission structure, to ensure the lead nut can move along the lead screw axis, an anti-rotation structure is needed to restrict its rotation. Because deviations can occur during the manufacturing and assembly of the lead screw, lead nut, and other related structures, these deviations can accumulate and cause the anti-rotation structure to jam the lead screw and nut drive mechanism during operation, resulting in jamming and abnormal noise. Summary of the Invention

[0003] In view of this, the present invention provides a lead screw and lead nut anti-rotation mechanism, which can accommodate the offset of the lead nut during movement, prevent jamming between the anti-rotation structure and the lead nut, and reduce abnormal noise.

[0004] This invention provides a lead screw and nut anti-rotation mechanism, comprising:

[0005] Base;

[0006] Screw-nut kinematic pair

[0007] An outer sleeve is fitted onto a nut to prevent the nut from rotating. A protruding portion is formed on the outer sleeve, which is formed on the outer side wall of the outer sleeve and extends in a direction away from the axis of the outer sleeve.

[0008] A connecting block is fixed on the base, and a groove is formed on the connecting block. The protrusion extends into the groove. A first gap is formed between the groove and the protrusion along the axial direction of the outer sleeve, and / or a second gap is formed between the groove and the protrusion along the radial direction of the outer sleeve.

[0009] Furthermore, the connecting block includes a retaining ring, an elastic element, and an elastic element base. The elastic element base is fixed on the base, the elastic element is disposed between the base and the retaining ring, and the retaining ring is pressed against the elastic element base by its elastic energy. The groove is formed between the base and the elastic element.

[0010] Furthermore, on the side of the elastic element base facing the base, a first recess and a second recess are formed sequentially in a direction away from the base. The second recess is formed at the bottom of the first recess, and the groove is formed between the second recess and the retaining ring. The retaining ring abuts against the bottom of the first recess.

[0011] Furthermore, the depth of the second recess along the axial direction of the outer sleeve is greater than the thickness of the protrusion along the axial direction of the outer sleeve, so that a first gap is formed between the protrusion and the groove in the axial direction of the outer sleeve.

[0012] Furthermore, in the radial direction of the outer sleeve, the width of the second recess is greater than the height of the protrusion in the radial direction of the outer sleeve, so that a second gap is formed between the top of the protrusion in the radial direction of the outer sleeve and the sidewall of the second recess.

[0013] Furthermore, a recess is formed on the side of the retaining ring facing the elastic element base, and the groove is formed between the recess on the retaining ring and the side of the elastic element base facing the base.

[0014] Furthermore, an extension is formed on the elastic element base, the extension is sleeved on the outer sleeve, one end of the extension is connected to the bottom of the second recess, and the other end extends away from the first recess. On the inner sidewall of the extension, a third recess is formed in a direction away from the axis of the outer sleeve, and a protrusion is formed on the outer sidewall of the outer sleeve. When the outer sleeve is engaged with the connecting block, the protrusion extends into the third recess to prevent the outer sleeve from rotating around its own axis and moving the base, and to prevent the retaining ring from falling off the elastic element base.

[0015] Furthermore, an undercut is formed on the elastic element base. When the retaining ring is disposed on the connecting block, the retaining ring on the retaining ring engages with the undercut, so that the retaining ring can be positioned relative to the elastic element base along the axial direction of the outer sleeve.

[0016] Furthermore, a flange extending away from its own axis is formed on the elastic element base, and a groove is formed on the base. The flange is riveted to the groove so that the elastic element base is fixed on the base.

[0017] Furthermore, a guide groove extending along the axial direction of the outer sleeve is formed on one of the outer sidewall of the nut and the inner sidewall of the outer sleeve, and a guide rail extending along the axial direction of the outer sleeve is formed on the other of the outer sidewall of the nut and the inner sidewall of the outer sleeve. When the outer sleeve is fitted onto the nut, the guide rail extends into the guide groove.

[0018] In summary, in this invention, during transmission, when errors occur in the manufacturing or assembly process of various components in the lead screw and nut anti-rotation mechanism, causing a deviation in the coaxiality between the outer sleeve and the lead screw nut, the outer sleeve can undergo a slight movement relative to the base along its own axis and / or its own radial direction due to the gap between the protrusion and the groove along the axial direction and radial direction of the outer sleeve. This slight displacement puts the outer sleeve in a state similar to "floating," thereby automatically adjusting the position of the outer sleeve's axis according to the change in the axis of the lead screw nut, eliminating the deviation in coaxiality between the outer sleeve and the lead screw nut. Therefore, this lead screw and nut anti-rotation mechanism can accommodate the offset of the lead screw nut during movement, prevent jamming between the outer sleeve and the lead screw nut, and reduce abnormal noise.

[0019] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0020] Figure 1 The figure shown is a cross-sectional structural schematic diagram of the lead screw and nut anti-rotation mechanism provided in an embodiment of the present invention.

[0021] Figure 2 As shown Figure 1 A magnified structural diagram of the area within the middle circle.

[0022] Figure 3 As shown Figure 1 A schematic diagram of the axial structure of the anti-jamming screw nut.

[0023] Figure 4 As shown Figure 1 A schematic diagram of the structure of the central base.

[0024] Figure 5 As shown Figure 1 A schematic diagram of the structure of the lead screw and lead nut.

[0025] Figure 6 As shown Figure 1 A schematic diagram of the structure of the inner and outer jacket.

[0026] Figure 7 As shown Figure 1 A schematic diagram of the structure of the base of the intermediate elastic element.

[0027] Figure 8 As shown Figure 1 A schematic diagram of the cross-sectional structure of the base of the intermediate elastic element. Detailed Implementation

[0028] To further illustrate the technical means and effects adopted by the present invention in order to achieve the intended purpose, the following detailed description is provided in conjunction with the accompanying drawings and preferred embodiments.

[0029] This invention provides a lead screw and lead nut anti-rotation mechanism, which can accommodate the offset of the lead nut during movement, prevent jamming between the anti-rotation structure and the lead nut, and reduce abnormal noise.

[0030] Figure 1 The figure shown is a cross-sectional structural schematic diagram of the lead screw and nut anti-rotation mechanism provided in an embodiment of the present invention. Figure 2 As shown Figure 1 Enlarged structural diagram of the area within the middle circle. Figure 3 As shown Figure 1 A schematic diagram of the axial structure of the anti-jamming screw nut. (See diagram below.) Figures 1 to 3 As shown, the anti-rotation mechanism for the lead screw and nut provided in this embodiment of the invention includes a lead screw-nut kinematic pair composed of a lead screw nut 10 and a lead screw 20, an outer sleeve 30 sleeved on the lead screw nut 10 to prevent rotation of the lead screw nut 10, a base 40, and a connecting block 50. The connecting block 50 is fixed on the base 40, and a groove 60 is formed on the connecting block 50. The outer sleeve 30 is disposed on the base 40 through the connecting block 50, and a protrusion 31 is formed on the outer sleeve 30. The protrusion 31 is formed on the outer side wall of the outer sleeve 30 and extends in a direction away from the axis of the outer sleeve 30. The protrusion 31 extends into the groove 60. A first gap is formed between the groove 60 and the protrusion 31 along the axial direction of the outer sleeve 30 (see...). Figure 2 (a) and / or, along the radial direction of the outer sleeve 30, a second gap is formed between the groove 60 and the protrusion 31 (see a) Figure 2 (b)

[0031] In this embodiment, when the lead screw 20 is rotated by a power source (not shown), such as a motor, the nut 10 is subjected to a force along the circumferential direction, that is, around the axis of the lead screw 20. This force is restricted by the outer sleeve 30. Therefore, the movement of the nut 10 around the axis of the lead screw 20 is suppressed, which in turn makes the nut 10 only able to move along the axis of the lead screw 20. In other words, the outer sleeve 30 exists in the lead screw and nut anti-rotation mechanism as an anti-rotation structure that can prevent the nut 10 from rotating. During transmission, if errors occur in the manufacturing or assembly of various components of the lead screw and nut anti-rotation mechanism, causing a deviation in the coaxiality between the outer sleeve 30 and the lead screw nut 10, the outer sleeve 30 can move slightly relative to the base 40 in its own axial direction and / or radial direction due to the gap between the protrusion 31 and the groove 60 along the axial direction and / or radial direction of the outer sleeve 30. This slight displacement puts the outer sleeve 30 in a state similar to "floating", thereby enabling the position of the axis of the outer sleeve 30 to be automatically adjusted according to the change of the axis of the lead screw nut 10, eliminating the deviation in coaxiality between the outer sleeve 30 and the lead screw nut 10.

[0032] When the nut 10 shifts along its own axis, due to the presence of the first gap, the outer sleeve 30 can move along the axis of the nut together with the nut 10 (i.e., Figure 1 and Figure 2 (in the left and right directions); when the nut 10 shifts in its own radial direction, due to the existence of the second gap, the outer sleeve can move together with the nut 10 in the radial direction (that is, in the left and right directions); Figure 1 and Figure 2 (Up and down direction). Therefore, the anti-rotation mechanism of the lead screw and nut can accommodate the deviation of the lead screw nut 10 during movement, prevent jamming between the outer sleeve 30 and the lead screw nut 10, and reduce abnormal noise.

[0033] Please continue to refer to Figures 1 to 3 In this embodiment, the connecting block 50 includes a retaining ring 51, an elastic element 52, and an elastic element base 53. The retaining ring 51 and the elastic element base 53 are sleeved on the outer sleeve 30. The elastic element base 53 is fixed to the base 40, and the elastic element 52 is disposed between the base 40 and the retaining ring 51, and the retaining ring 51 is pressed against the elastic element base 53 by its elasticity. The groove 60 is formed between the base 40 and the elastic element base 53.

[0034] In other words, viewed along the axial direction of the outer sleeve 30, the base 40, elastic element 52, retaining ring 51, protrusion 31, and elastic element base 53 are arranged sequentially, with the retaining ring 51 in a floating state via the elastic element 52. When the outer sleeve 30 deviates significantly towards the base 40, exceeding the distance of the first gap between the protrusion 31 and the groove 60 along the axial direction of the outer sleeve 30, the protrusion 31 can push the retaining ring 51 to continue moving towards the base 40, thereby enabling the lead screw nut anti-rotation mechanism to absorb greater errors.

[0035] In this embodiment, a first recess 531 and a second recess 532 are sequentially formed on the side of the elastic element base 53 facing the base 40, moving away from the base 40. In other words, the second recess 532 forms the bottom of the first recess 531. The groove 60 is formed between the second recess 532 and the retaining ring 51, and the retaining ring 51 abuts against the bottom of the first recess 531.

[0036] The depth of the second recess 532 along the axial direction of the outer sleeve 30 is greater than the thickness of the protrusion 31 along the axial direction of the outer sleeve 30, so that a first gap is formed between the protrusion 31 and the groove 60 in the axial direction of the outer sleeve 30.

[0037] In the radial direction of the outer sleeve 30, the width of the second recess 532 (in this embodiment, the second recess 532 can be annular, and its width is the diameter of the second recess 532) is greater than the height of the protrusion 31 protruding in the radial direction of the outer sleeve 30, so that a second gap is formed between the top of the protrusion 31 in the radial direction of the outer sleeve 30 and the sidewall of the second recess 532.

[0038] In other embodiments, a recess may be formed on the side of the retaining ring 51 facing the elastic element base 53, and the groove 60 is formed between the recess on the retaining ring 51 and the side of the elastic element base 53 facing the base 40.

[0039] The elastic element 52 can be a spring, which is sleeved outside the outer sleeve 30 and sandwiched between the retaining ring 51 and the elastic element base 53.

[0040] Figure 4 As shown Figure 1 Schematic diagram of the middle base. Figure 5 As shown Figure 1 Schematic diagram of the structure of the lead screw and lead nut. Figure 6 As shown Figure 1 A structural diagram of the inner and outer jacket. Please refer to... Figures 4 to 6 As shown, the protrusion 31 of the outer sleeve 30 can be annular, surrounding the outer wall of the outer sleeve 30. That is, the protrusion 31 can exist in the form of a flange. Correspondingly, the second recess 532 can also be annular.

[0041] An extension 533 is also formed on the elastic base 53. The extension 533 is sleeved on the outer sleeve 30. One end of the extension 533 is connected to the bottom of the second recess 532, and the other end extends away from the first recess 531.

[0042] A third recess 534 is formed on the inner wall of the extension 533 in a direction away from the axis of the outer sleeve 30. A protrusion 32 is formed on the outer wall of the outer sleeve 30. When the outer sleeve 30 is engaged with the connecting block 50, the protrusion 32 extends into the third recess 534, so as to prevent the outer sleeve 30 from rotating around its own axis by means of the third recess 534 and the protrusion 32, thereby achieving the effect of restricting the rotation of the nut 10 by the outer sleeve 30.

[0043] The third recess 534 is located at the intersection of the extension 533 and the second recess 532, and communicates with the second recess 532 to facilitate the insertion of the protrusion 32. Correspondingly, the position of the protrusion 32 on the outer sleeve 30 is connected to the protrusion 31.

[0044] A guide groove 11 extending along the axial direction of the outer sleeve 30 is formed on one of the outer wall of the nut 10 and the inner wall of the outer sleeve 30, and a guide rail 33 extending along the axial direction of the outer sleeve 30 is formed on the other of the outer wall of the nut 10 and the inner wall of the outer sleeve 30. In this embodiment, the guide rail 33 is formed on the inner wall of the outer sleeve 30, and the guide groove 11 is formed on the outer wall of the nut 10. When the outer sleeve 30 is fitted onto the nut 10, the guide rail 33 extends into the guide groove 11, so that the nut 10 can move relative to the outer sleeve 30 along its own axis, but cannot rotate relative to the outer sleeve 30 about its own axis.

[0045] Figure 7 As shown Figure 1 Schematic diagram of the structure of the base of the intermediate elastic element. Figure 8 As shown Figure 1 A schematic diagram of the cross-sectional structure of the base of the intermediate elastic element. (See diagram below.) Figure 2 , Figure 4 , Figure 7 and Figure 8 As shown, in this embodiment, a flange 535 extending away from its own axis is formed on the elastic element base 53, and a groove 41 is formed on the base 40. The flange 535 is riveted to the groove 41 so that the elastic element base 53 is fixed on the base 40.

[0046] An undercut 535 is also formed on the elastic element base 53. When the retaining ring 51 is placed on the connecting block 50, the retaining ring (not shown in the figure) on the retaining ring 51 engages with the undercut 535, so that the retaining ring 51 can move relative to the elastic element base 53 along the axial direction of the outer sleeve 30 while preventing the retaining ring 51 from coming off the elastic element base 53.

[0047] In summary, in this invention, during transmission, when errors occur in the manufacturing or assembly process of various components in the lead screw and nut anti-rotation mechanism, causing a deviation in the coaxiality between the outer sleeve 30 and the lead screw nut 10, the presence of gaps between the protrusion 31 and the groove 60 along the axial direction and radial direction of the outer sleeve 30 allows the outer sleeve 30 to move slightly relative to the base 40 along its own axial direction and / or its own radial direction. This slight displacement puts the outer sleeve 30 in a state similar to "floating," thereby automatically adjusting the position of the outer sleeve 30's axis according to the change in the axis of the lead screw nut 10, eliminating the deviation in coaxiality between the outer sleeve 30 and the lead screw nut 10. Therefore, this lead screw and nut anti-rotation mechanism can accommodate the offset of the lead screw nut 10 during movement, prevent jamming between the outer sleeve 30 and the lead screw nut 10, and reduce abnormal noise.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A lead screw and nut anti-rotation mechanism, characterized in that: It includes: a base; a screw-nut pair, an outer sleeve, which is sleeved on the nut to prevent the nut from rotating, and a protrusion is formed on the outer sleeve, the protrusion is formed on the outer side wall of the outer sleeve and extends away from the axis of the outer sleeve; a connecting block, which is fixed on the base, and a groove is formed on the connecting block, the protrusion extends into the groove, a first gap is formed between the groove and the protrusion along the axis of the outer sleeve, and a second gap is formed between the groove and the protrusion along the radial direction of the outer sleeve; the connecting block includes a check ring, an elastic member and an elastic member base, the check ring and the elastic member base are sleeved on the outer sleeve, the elastic member base is fixed on the base, the elastic member is arranged between the base and the check ring and relies on the elasticity to abut against the elastic member base, and the groove is formed between the base and the elastic member.

2. The anti-rotation mechanism for a lead screw and nut according to claim 1, wherein: a first recess and a second recess are sequentially formed on the side of the elastic member base facing the base, the second recess is formed on the bottom of the first recess, the groove is formed between the second recess and the check ring, and the check ring abuts against the bottom of the first recess.

3. The anti-rotation mechanism for a lead screw and nut as set forth in claim 2, wherein: the depth of the second recess along the axis of the outer sleeve is greater than the thickness of the protrusion along the axis of the outer sleeve, so that a first gap is formed between the protrusion and the groove along the axis of the outer sleeve.

4. The anti-rotation mechanism for a lead screw and nut as set forth in claim 2, wherein: in the radial direction of the outer sleeve, the width of the second recess is greater than the height of the protrusion extending in the radial direction of the outer sleeve, so that a second gap is formed between the top of the protrusion in the radial direction of the outer sleeve and the side wall of the second recess.

5. The anti-rotation mechanism for a lead screw and nut as set forth in claim 2, wherein: a recess is formed on the side of the check ring facing the elastic member base, and the groove is formed between the recess on the check ring and the side of the elastic member base facing the base.

6. The anti-rotation mechanism for a lead screw and nut as set forth in claim 2, wherein: an extension is further formed on the elastic member base, the extension is sleeved on the outer sleeve, one end of the extension is connected with the bottom of the second recess, the other end extends away from the first recess, a third recess is formed on the inner side wall of the extension away from the axis of the outer sleeve, and a protrusion is formed on the outer side wall of the outer sleeve, when the outer sleeve and the connecting block are combined, the protrusion extends into the third recess, so that the outer sleeve is prevented from rotating around its axis relative to the base, and the check ring is prevented from being separated from the elastic member base.

7. The anti-rotation mechanism for a lead screw and nut as set forth in claim 1, wherein: a reverse buckle is formed on the elastic member base, when the check ring is arranged on the connecting block, the snap ring on the check ring is combined with the reverse buckle, so that the check ring can move relative to the elastic member base along the axis of the outer sleeve while being prevented from being separated from the elastic member base.

8. The anti-rotation mechanism for a lead screw and nut as set forth in claim 1, wherein: A flange extending away from the axis of the base is formed on the base of the elastic member, and a recess is formed on the base. The flange is combined with the recess by riveting to fix the base of the elastic member to the base.

9. The anti-rotation mechanism for a lead screw and nut as set forth in claim 1, wherein: A guide groove extending along the axis of the sleeve is formed on one of the outer sidewall of the nut and the inner sidewall of the sleeve, and a guide rail extending along the axis of the sleeve is formed on the other of the outer sidewall of the nut and the inner sidewall of the sleeve. The guide rail extends into the guide groove when the sleeve is sleeved on the nut.

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