Anti-seizing screw nut transmission mechanism

Abstract

The application discloses a kind of anti-jamming screw nut transmission mechanism, including nut, screw rod, anti-rotation sleeve, pedestal and pressure head, nut is sleeved in screw rod outside, anti-rotation sleeve is sleeved in nut outside, anti-rotation sleeve limits nut rotation around its axis, so that nut can move along the axis direction of screw rod, anti-rotation sleeve is connected with pedestal, pedestal limits anti-rotation sleeve rotation around its axis, pressure head is fixed on pedestal, and make between pressure head and pedestal form a accommodating groove, there is protruding portion on anti-rotation sleeve, protruding portion is formed on the outer side wall of anti-rotation sleeve, and extend towards the axis direction away from anti-rotation sleeve, protruding portion is clamped in accommodating groove, along the axis direction of anti-rotation sleeve, first gap is formed between accommodating groove and protruding portion, and / or, along the radial direction of anti-rotation sleeve, second gap is formed between accommodating groove and protruding portion.The anti-jamming screw nut transmission mechanism can prevent the phenomenon that anti-rotation structure and nut appear jamming, reduce abnormal sound.

Description

Technical Field

[0001] This invention relates to the field of lead screw-nut transmission pair technology, and particularly to an anti-jamming lead screw-nut transmission 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 an anti-jamming screw and nut transmission mechanism, which can prevent jamming between the anti-rotation structure and the nut, and reduce abnormal noise.

[0004] This invention provides an anti-jamming lead screw and nut transmission mechanism, including a lead screw, a lead screw, an anti-rotation sleeve, a base, and a pressure head. The lead screw is sleeved outside the lead screw, and the anti-rotation sleeve is sleeved outside the lead screw. The anti-rotation sleeve restricts the lead screw from rotating around its own axis, allowing the lead screw to move along the axial direction of the lead screw. The anti-rotation sleeve is connected to the base, and the base restricts the anti-rotation sleeve from rotating around its own axis. The pressure head is fixed on the base, forming a receiving groove between the pressure head and the base. A protrusion is formed on the anti-rotation sleeve, located on the outer side wall of the anti-rotation sleeve and extending away from the axial direction of the anti-rotation sleeve. The protrusion is clamped within the receiving groove. A first gap is formed between the receiving groove and the protrusion along the axial direction of the anti-rotation sleeve, and / or a second gap is formed between the receiving groove and the protrusion along the radial direction of the anti-rotation sleeve.

[0005] Furthermore, along the radial direction of the anti-rotation sleeve, a second gap is formed between the receiving groove and the protrusion, and in the radial direction of the anti-rotation sleeve, a third gap not less than the second gap is formed between the anti-rotation sleeve, the base, and the pressure head.

[0006] Furthermore, the pressure head includes a retaining ring, an elastic element, and an elastic element base. The retaining ring is sleeved on the anti-rotation sleeve, and the receiving groove is formed between the base and the retaining ring. The retaining ring abuts against the base by the elastic element.

[0007] Furthermore, on the side of the base facing the anti-rotation sleeve, a first recess and a second recess are formed sequentially in a direction away from the anti-rotation sleeve. The receiving groove is formed between the first recess and the retaining ring, and the retaining ring abuts against the bottom of the second recess.

[0008] Furthermore, a recess is formed on the side of the retaining ring facing the base, and the receiving groove is formed between the recess on the retaining ring and the side of the base facing the anti-rotation sleeve.

[0009] Furthermore, the elastic element is a spring, which is sleeved outside the anti-rotation sleeve and sandwiched between the retaining ring and the elastic element base.

[0010] Furthermore, a flange extending away from its own axis is formed on the elastic base, and a groove is formed on the base. The flange is riveted to the groove so that the elastic base is fixed to the base.

[0011] Furthermore, the protruding portion of the anti-rotation sleeve is annular and is arranged around the outer side wall of the anti-rotation sleeve, and the receiving portion is annular.

[0012] Furthermore, a through hole is formed on the base for the moving part driven by the nut to pass through. A third recess is formed on the side wall of the through hole in a direction away from the axis of the through hole. A protrusion is formed on the outer side wall of the anti-rotation sleeve. When the anti-rotation sleeve is engaged with the base and the pressure head, the protrusion extends into the third recess to prevent the anti-rotation sleeve from rotating through the third recess and the protrusion.

[0013] Furthermore, a guide groove extending along the axial direction of the anti-rotation sleeve is formed on one of the outer side wall of the nut and the inner side wall of the anti-rotation sleeve, and a guide rail extending along the axial direction of the anti-rotation sleeve is formed on the other of the outer side wall of the nut and the inner side wall of the anti-rotation sleeve. When the anti-rotation sleeve is fitted onto the nut, the guide rail extends into the guide groove.

[0014] In summary, in this invention, during transmission, when errors occur in the manufacturing or assembly process of various components in the anti-jamming screw and nut transmission mechanism, causing a deviation in the coaxiality between the anti-rotation sleeve and the nut, the existence of gaps between the protrusion and the receiving groove along the axial direction and radial direction of the anti-rotation sleeve allows the anti-rotation sleeve to move slightly relative to the base along its own axial direction and / or its own radial direction. This slight displacement puts the anti-rotation sleeve in a state similar to "floating," thereby automatically adjusting the position of the anti-rotation sleeve's axis according to the change in the nut's axis, eliminating the deviation in coaxiality between the anti-rotation sleeve and the nut. Therefore, it can prevent jamming between the anti-rotation structure and the nut, reducing abnormal noise.

[0015] 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

[0016] Figure 1 The figure shown is a cross-sectional structural schematic diagram of the anti-jamming lead screw and nut transmission mechanism provided in an embodiment of the present invention.

[0017] Figure 2 As shown Figure 1 A magnified structural diagram of the area within the middle circle.

[0018] Figure 3 As shown Figure 1 A schematic diagram of the axial structure of the anti-jamming screw nut.

[0019] Figure 4 As shown Figure 1 A schematic diagram of the structure of the central base.

[0020] Figure 5 As shown Figure 1 Schematic diagram of the cross-sectional structure of the central base.

[0021] Figure 6 As shown Figure 1 A schematic diagram of the structure of the lead screw and lead nut.

[0022] Figure 7 As shown Figure 1 A schematic diagram of the structure of the anti-rotation sleeve.

[0023] Figure 8 As shown Figure 1 A schematic diagram of the structure of the base of the intermediate elastic element. Detailed Implementation

[0024] 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.

[0025] This invention provides an anti-jamming lead screw and nut transmission mechanism, which can prevent jamming between the anti-rotation structure and the lead screw and nut, and reduce abnormal noise.

[0026] Figure 1 The figure shown is a cross-sectional structural schematic diagram of the anti-jamming lead screw and nut transmission 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-jamming lead screw and nut transmission mechanism provided in this embodiment of the invention includes a lead nut 10, a lead screw 20, an anti-rotation sleeve 30, a base 40, and a pressure head 50. The lead nut 10 is sleeved outside the lead screw 20, and the anti-rotation sleeve 30 is sleeved outside the lead nut 10. The anti-rotation sleeve 30 restricts the lead nut 10 from rotating around its own axis, allowing the lead nut 10 to move along the axial direction of the lead screw 20. The anti-rotation sleeve 30 is connected to the base 40, and the base 40 prevents the anti-rotation sleeve 30 from rotating around its own axis. The pressure head 50 is fixed to the base 40, forming a receiving groove 60 between the pressure head 50 and the base 40. A protrusion 31 is formed on the anti-rotation sleeve 30, extending from the outer side wall of the anti-rotation sleeve 30 away from its axial direction. The protrusion 31 is clamped within the receiving groove 60 between the base 40 and the pressure head 50. Along the axial direction of the anti-rotation sleeve 30, a first gap is formed between the sidewall of the receiving groove 60 and the protrusion 31 (see...). Figure 2 (a) and / or, along the radial direction of the anti-rotation sleeve 30, a second gap is formed between the receiving groove 60 and the protrusion 31 (see a) Figure 2 (b)

[0027] In this embodiment, when the lead screw 20 is rotated by a power source (not shown), the nut 10 is subjected to a force along the circumferential direction, that is, around the axis of the lead screw 20, which is transmitted to the base 40 through the anti-rotation sleeve 30. Therefore, the movement of the nut 10 around the axis of the lead screw 20 is suppressed, thereby allowing the nut 10 to move only along the axis of the lead screw 20. In other words, the anti-rotation sleeve 30 exists in the anti-jamming lead screw and nut transmission 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 in the anti-jamming screw and nut transmission mechanism, causing a deviation in the coaxiality between the anti-rotation sleeve 30 and the nut 10, the anti-rotation sleeve 30 can undergo slight movement relative to the base 40 in its own axial and / or radial directions due to the gap between the protrusion 31 and the receiving groove 60 along its axial direction and / or radial direction. This slight displacement puts the anti-rotation sleeve 30 in a state similar to "floating," allowing the position of the anti-rotation sleeve 30's axis to automatically adjust with the change in the axis of the nut 10, eliminating the coaxiality deviation between the anti-rotation sleeve 30 and the nut 10. Therefore, it can prevent jamming between the anti-rotation structure and the nut 10, reducing abnormal noise.

[0028] Furthermore, please continue to refer to Figure 2 In this embodiment, in order to facilitate the adjustment of the axial position of the anti-rotation sleeve 30, a third gap not less than the second gap is formed between the anti-rotation sleeve 30, the base 40, and the pressure head 50 in the radial direction of the anti-rotation sleeve 30 (see...). Figure 2 (c) With the above settings, it is easier to make the anti-rotation sleeve 30 offset slightly in its own radial direction relative to the base 40 and the pressure head 50.

[0029] Please continue to refer to Figures 1 to 3In this embodiment, the pressure head 50 includes a retaining ring 51, an elastic element 52, and an elastic element base 53. The retaining ring 51 is sleeved on the anti-rotation sleeve 30, and the aforementioned receiving groove 60 is formed between the base 40 and the retaining ring 51. The elastic element base 53 is fixed on the base 40, and the elastic element 52 is disposed between the retaining ring 51 and the elastic element base 53. The retaining ring 51 abuts against the base 40 by the elastic energy of the elastic element 52. That is, viewed along the axial direction of the anti-rotation sleeve 30, the base 40, the protrusion 31, the retaining ring 51, the elastic element 52, and the elastic element base 53 are arranged sequentially, and the retaining ring 51 is in a floating state through the elastic element 52. When the anti-rotation sleeve 30 deviates significantly away from the base 40, exceeding the distance between the protrusion 31 and the receiving groove 60 in the first gap in the axial direction of the anti-rotation sleeve 30, the protrusion 31 can push the retaining ring 51 to continue moving towards the elastic element base 53, thereby enabling the anti-jamming screw nut transmission mechanism to absorb greater errors.

[0030] Figure 4 As shown Figure 1 Schematic diagram of the central base. Figure 5 As shown Figure 1 A schematic diagram of the cross-sectional structure of the central base. Please refer to the following. Figure 2 , Figure 4 and Figure 5 In this embodiment, on the side of the base 40 facing the anti-rotation sleeve 30, a first recess 41 and a second recess 42 are sequentially formed in a direction away from the anti-rotation sleeve 30. That is, the second recess 42 is formed at the bottom of the first recess 41, the aforementioned receiving groove 60 is formed between the second recess 42 and the retaining ring 51, and the retaining ring 51 abuts against the bottom of the first recess 41.

[0031] In other embodiments, a recess may be formed on the side of the retaining ring 51 facing the base 40, and the aforementioned receiving groove 60 is formed between the recess on the retaining ring 51 and the side of the base 40 facing the anti-rotation sleeve 30.

[0032] The elastic element 52 can be a spring, which is sleeved outside the anti-rotation sleeve 30 and clamped between the retaining ring 51 and the elastic element base 53.

[0033] Figure 6 As shown Figure 1 Schematic diagram of the structure of the lead screw and lead nut. Figure 7 As shown Figure 1 A structural schematic diagram of the anti-rotation sleeve. Please refer to... Figures 4 to 7 As shown, the protrusion 31 of the anti-rotation sleeve 30 can be annular, surrounding the outer wall of the anti-rotation sleeve 30. That is, the protrusion 31 can exist in the form of a flange. Correspondingly, the second recess 42 can also be annular.

[0034] A through hole 43 is formed on the base 40 for the moving part 11 driven by the nut 10 to pass through. A third recess 44 is formed on the side wall of the through hole 43 in a direction away from the axis of the through hole 43. A protrusion 32 is formed on the outer side wall of the anti-rotation sleeve 30. When the anti-rotation sleeve 30 is engaged with the base 40 and the pressure head 50, the protrusion 32 extends into the third recess 44 to prevent the anti-rotation sleeve 30 from rotating. That is, the function of the base 40 in preventing the anti-rotation sleeve 30 from rotating relative to itself is achieved by the engagement of the protrusion 32 and the third recess 44. The third recess 44 is formed at the bottom of the second recess 42 and communicates with the second recess 42 to facilitate the insertion of the protrusion 32.

[0035] A guide groove 12 extending along the axial direction of the anti-rotation sleeve 30 is formed on one of the outer side wall of the nut 10 and the inner side wall of the anti-rotation sleeve 30, and a guide rail 33 extending along the axial direction of the anti-rotation sleeve 30 is formed on the other of the outer side wall of the nut 10 and the inner side wall of the anti-rotation sleeve 30. In this embodiment, the guide rail 33 is formed on the inner side wall of the anti-rotation sleeve 30, and the guide groove 12 is formed on the outer side wall of the nut 10. When the anti-rotation sleeve 30 is fitted onto the nut 10, the guide rail 33 extends into the guide groove 12, so that the nut 10 can move relative to the anti-rotation sleeve 30 along its own axis, but cannot rotate relative to the anti-rotation sleeve 30 about its own axis.

[0036] Figure 8 As shown Figure 1 A structural schematic diagram of the base of the intermediate elastic element is shown below. Figure 2 , Figure 4 and Figure 8 As shown, in this embodiment, a flange 531 extending away from its own axis is formed on the elastic element base 53, and a groove 45 is formed on the base 40. The flange 531 is riveted to the groove 45 so that the elastic element base 53 is fixed on the base 40.

[0037] In summary, in this invention, during transmission, when errors occur in the manufacturing or assembly process of various components in the anti-jamming screw and nut transmission mechanism, causing a deviation in the coaxiality between the anti-rotation sleeve 30 and the nut 10, the anti-rotation sleeve 30 can undergo slight movement relative to the base 40 along its own axial direction and / or its own radial direction due to the gap between the protrusion 31 and the receiving groove 60 along the axial direction and radial direction of the anti-rotation sleeve 30. This slight displacement puts the anti-rotation sleeve 30 in a state similar to "floating," thereby automatically adjusting the position of the anti-rotation sleeve 30's axis according to the change in the axis of the nut 10, eliminating the deviation in coaxiality between the anti-rotation sleeve 30 and the nut 10. Therefore, it can prevent jamming between the anti-rotation structure and the nut 10, reducing abnormal noise.

[0038] 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 screw and nut transmission mechanism for preventing jamming, characterized in that: The device includes a lead screw, a lead rod, an anti-rotation sleeve, a base, and a pressure head. The lead screw is sleeved around the lead rod, and the anti-rotation sleeve is sleeved around the lead screw. The anti-rotation sleeve restricts the lead screw from rotating about its own axis, allowing the lead screw to move along the axis of the lead rod. The anti-rotation sleeve is connected to the base, and the base restricts the anti-rotation sleeve from rotating about its own axis. The pressure head is fixed to the base, forming a receiving groove between the pressure head and the base. A protrusion is formed on the outer side wall of the anti-rotation sleeve, pointing away from the anti-rotation sleeve. Extending along the axial direction, the protrusion is clamped within the receiving groove. A first gap is formed between the receiving groove and the protrusion along the axial direction of the anti-rotation sleeve, and / or a second gap is formed between the receiving groove and the protrusion along the radial direction of the anti-rotation sleeve. The pressure head includes a retaining ring, an elastic element, and an elastic element base. The retaining ring is sleeved on the anti-rotation sleeve. The receiving groove is formed between the base and the retaining ring. The elastic element base is fixed on the base. The elastic element is disposed between the retaining ring and the elastic element base. The retaining ring abuts against the base by the elastic element.

2. The anti-jamming lead screw and nut transmission mechanism according to claim 1, characterized in that: Along the radial direction of the anti-rotation sleeve, a second gap is formed between the receiving groove and the protrusion. In the radial direction of the anti-rotation sleeve, a third gap not less than the second gap is formed between the anti-rotation sleeve, the base, and the pressure head.

3. The anti-jamming lead screw and nut transmission mechanism according to claim 1, characterized in that: On the side of the base facing the anti-rotation sleeve, a first recess and a second recess are formed sequentially in the direction away from the anti-rotation sleeve. The receiving groove is formed between the first recess and the retaining ring, and the retaining ring abuts against the bottom of the second recess.

4. The anti-jamming lead screw and nut transmission mechanism according to claim 1, characterized in that: A recess is formed on the side of the retaining ring facing the base, and the receiving groove is formed between the recess on the retaining ring and the side of the base facing the anti-rotation sleeve.

5. The anti-jamming lead screw and nut transmission mechanism according to claim 1, characterized in that: The elastic element is a spring, which is sleeved outside the anti-rotation sleeve and sandwiched between the retaining ring and the elastic element base.

6. The anti-jamming lead screw and nut transmission mechanism according to claim 1, characterized in that: 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.

7. The anti-jamming lead screw and nut transmission mechanism according to claim 1, characterized in that: The protruding part of the anti-rotation sleeve is annular and is arranged around the outer side wall of the anti-rotation sleeve, and the receiving groove is annular.

8. The anti-jamming lead screw and nut transmission mechanism according to claim 1, characterized in that: A through hole is formed on the base for the moving part driven by the nut to pass through. A third recess is formed on the side wall of the through hole in a direction away from the axis of the through hole. A protrusion is formed on the outer side wall of the anti-rotation sleeve. When the anti-rotation sleeve is engaged with the base and the pressure head, the protrusion extends into the third recess to prevent the anti-rotation sleeve from rotating through the third recess and the protrusion.

9. The anti-jamming lead screw and nut transmission mechanism according to claim 1, characterized in that: A guide groove extending along the axial direction of the anti-rotation sleeve is formed on one of the outer side wall of the nut and the inner side wall of the anti-rotation sleeve. A guide rail extending along the axial direction of the anti-rotation sleeve is formed on the other of the outer side wall of the nut and the inner side wall of the anti-rotation sleeve. When the anti-rotation sleeve is fitted onto the nut, the guide rail extends into the guide groove.

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