Self-unlocking anti-backlash nut assembly

Abstract

The utility model discloses a self-unlocking anti-backlash nut assembly, which relates to the technical field of lead screw transmission, and comprises a lead screw, a first nut, a second nut, a locking piece and an unlocking piece, the first nut and the second nut are both in threaded connection with the lead screw; the locking piece is used for applying acting force to the first nut and the second nut, and the acting force enables the first nut and the second nut to move in the direction away from each other or close to each other. The unlocking piece is used for applying a driving force opposite to the acting force to the first nut or the second nut; according to the unlocking device, the driving force opposite to the acting force is applied to the first nut or the second nut through the unlocking piece, so that the pre-tightening pressure in the driving direction is counteracted, the unlocking purpose is achieved, the first nut and the second nut can easily move in the driving direction, and even if the pre-tightening force is too large, the transmission efficiency cannot be reduced.

Description

Technical Field

[0001] This utility model relates to the field of lead screw transmission technology, specifically to a self-unlocking backlash-eliminating nut assembly. Background Technology

[0002] Screw drives are a commonly used rotary-linear motion transmission mechanism. Backlash elimination in this type of transmission typically involves pre-tightening multiple nuts or reducing the clearance between the nuts. When using a double-nut pre-tightening backlash elimination scheme, there is a contradiction in selecting the pre-tightening force: too small a pre-tightening force results in a low critical load for the re-emergence of backlash; too large a pre-tightening force leads to a significant decrease in transmission efficiency. Reducing the clearance, such as using a screw and nut with unequal pitch, results in a small transmission clearance and high frictional resistance initially. As the mechanism wears down, the frictional resistance decreases, but the transmission clearance reappears.

[0003] In view of this, there is an urgent need for a self-unlocking gap-eliminating nut assembly. Utility Model Content

[0004] To address the problems existing in the prior art, this utility model solves the problem using the following technical structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A self-unlocking backlash-free nut assembly includes: a lead screw, a first nut, a second nut, a locking component, and an unlocking component, wherein both the first nut and the second nut are threadedly connected to the lead screw;

[0007] The locking element is used to apply forces to the first nut and the second nut respectively, and the forces cause the first nut and the second nut to move in a direction away from each other or close to each other;

[0008] The unlocking component is used to apply a driving force to the first nut or the second nut in the opposite direction to the force applied.

[0009] Its further feature is that,

[0010] The unlocking component includes a first anti-rotation component, which is sleeved on the first nut and the second nut, and the first anti-rotation component causes the first nut and the second nut to rotate synchronously.

[0011] The unlocking component also includes an unlocker, which is slidably mounted on the first anti-rotation component. The sliding direction of the unlocker is the axial direction of the lead screw. The ring side of the first nut and the ring side of the second nut are both engaged with the unlocker. When the unlocker slides in different directions, it causes the first nut or the second nut to move in the opposite direction to the force.

[0012] The first anti-rotation component is provided with a guide rod, the axial direction of which is consistent with the axial direction of the lead screw, and the guide rod passes through the unlocker.

[0013] The unlocking component includes a second anti-rotation component, which is sleeved on the first nut and the second nut. When the second anti-rotation component rotates in different directions, it causes the first nut or the second nut to rotate in the opposite direction to the direction of the force.

[0014] The unlocking component includes a third anti-rotation component and a lever component. The third anti-rotation component is sleeved on the first nut and the second nut. The third anti-rotation component is provided with a third limiting groove on the circumferential side of the first nut and the second nut. The first nut and the second nut are respectively provided with a first slot and a second slot on the side of the first nut and the second nut that are close to each other.

[0015] The lever component includes a locking plate and a locking strip disposed on one side of the locking plate. The locking plate is disposed in a third limiting groove, and the two ends of the locking strip are respectively locked in a first locking groove and a second locking groove.

[0016] The locking element is a spring, tension spring, spring sheet, or soft rubber pad, and the locking element is disposed between the first nut and the second nut.

[0017] The locking element includes two magnets respectively disposed on the first nut and the second nut.

[0018] The locking element is a torsion spring, and the two ends of the torsion spring are respectively disposed on the first nut and the second nut.

[0019] The locking element is a spring, tension spring, spring sheet, or soft rubber pad. There are two locking elements, and the two locking elements respectively give the first nut and the second nut opposite rotational forces.

[0020] The above-described structure of this utility model can achieve the following beneficial effects:

[0021] By applying a driving force opposite to the direction of the force to the first or second nut through the unlocking component, the preload pressure in the driving direction is counteracted, thereby achieving the purpose of unlocking. This allows the first and second nuts to move easily in the driving direction, and even if the preload is too large, the transmission efficiency will not be reduced. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this application;

[0023] Figure 2 This is a schematic cross-sectional view of the structure of Embodiment 1 of this application;

[0024] Figure 3 This is a schematic diagram of the unlocker in Embodiment 1 of this application;

[0025] Figure 4 This is an enlarged structural schematic diagram of Embodiment 2 of this application;

[0026] Figure 5 This is a schematic diagram of the internal structure of Embodiment 2 of this application;

[0027] Figure 6 This is a schematic diagram of the structure of the second anti-rotation component in Embodiment 2 of this application;

[0028] Figure 7 This is a structural schematic diagram of Embodiment 3 of this application;

[0029] Figure 8 This is a schematic diagram of the internal structure of Embodiment 3 of this application;

[0030] Figure 9 This is a schematic diagram of the structure of the first nut, the second nut, and the locking element in Embodiment 3 of this application;

[0031] Figure 10 This is a schematic diagram of the lever component in Embodiment 3 of this application;

[0032] Figure 11 This is a schematic diagram of the third anti-rotation component in Embodiment 3 of this application.

[0033] In the diagram: 1. Lead screw; 2. First nut; 21. First limiting block; 22. Third limiting block; 23. First slot; 3. Second nut; 31. Second limiting block; 32. Fourth limiting block; 33. Second slot; 4. Support component; 5. First anti-rotation component; 51. Guide rod; 6. Unlocker; 61. First limiting groove; 7. Second anti-rotation component; 71. Second limiting groove; 8. Third anti-rotation component; 81. Third limiting groove; 9. Lever component; 91. Card plate; 92. Card strip; 93. Top head. Detailed Implementation

[0034] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0035] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification, claims and accompanying drawings of this utility model are intended to cover non-exclusive inclusion. For example, a process, method, apparatus, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products or devices.

[0036] The following is in conjunction with the appendix Figures 1-11 This application will be described in further detail.

[0037] Example 1, Reference Figures 1-3 As shown, a self-unlocking backlash-eliminating nut assembly includes: a lead screw 1, a first nut 2, a second nut 3, a locking member 4, and an unlocking member. The first nut 2 and the second nut 3 are both threadedly connected to the lead screw 1. The locking member 4 applies forces to the first nut 2 and the second nut 3 respectively, causing them to move away from or towards each other. The unlocking member applies a driving force to the first nut 2 or the second nut 3 in the opposite direction to the applied force. In use, the locking member 4 applies forces to the first nut 2 and the second nut 3 respectively, causing them to move away from or towards each other. In other words, the locking element 4 applies opposite preload pressures to the threads of the lead screw 1 to the first nut 2 and the second nut 3 respectively (acting on different directions of the threads of the lead screw 1), thereby eliminating the gap between the nut and the threads of the lead screw 1. When driving, according to the driving direction (relative to the direction of movement of the lead screw 1), the unlocking element 4 applies a driving force opposite to the direction of the force to the first nut 2 or the second nut 3, thereby counteracting the preload pressure in the driving direction and achieving the purpose of unlocking. This allows the first nut 2 and the second nut 3 to move easily in the driving direction, and even if the preload is too large, the transmission efficiency will not be reduced.

[0038] like Figure 2 As shown, the unlocking component includes a first anti-rotation component 5 and an unlocker 6. The first anti-rotation component 5 is sleeved on the first nut 2 and the second nut 3, causing the first nut 2 and the second nut 3 to rotate synchronously. The first anti-rotation component 5 ensures that the first nut 2 and the second nut 3 rotate synchronously in the same direction during driving. The unlocker 6 is slidably mounted on the first anti-rotation component 5, with the sliding direction of the unlocker 6 being the axial direction of the lead screw 1. The annular side of the first nut 2 and the annular side of the second nut 3 are both engaged with the unlocker 6. When the unlocker 6 slides in different directions, it causes the first nut 2 or the second nut 3 to move in the opposite direction to the applied force. Specifically, this includes two implementation structures (the attached diagram only shows one of the structures, such as...). Figure 2As shown), one aspect is as follows: When the force of the locking member 4 causes the first nut 2 and the second nut 3 to move away from each other, the unlocker 6 is provided with a first limiting groove 61, the first nut 2 is provided with a first limiting block 21 on its ring side, and the second nut 3 is provided with a second limiting block 31 on its ring side. The first limiting block 21 and the second limiting block 31 are both slidably disposed in the first limiting groove 61, which is equivalent to setting a limiting plate on the side where the first nut 2 and the second nut 3 are away from each other. During driving (the lead screw 1 is the driving member, and the others (the first nut 2, the second nut 3, the first anti-rotation member 5, and the unlocker 6, etc.) are driven members), the unlocker 6 is moved in the opposite direction to the driving direction, so as to counteract the force on the side in the driving direction, and make the nut (here, the nut refers to the nut in the driving direction) located in the driving direction move in the opposite direction. The first nut 2 or the second nut 3 moves toward the side opposite to the driving direction to complete the unlocking; the second method is: when the force of the locking member 4 causes the first nut 2 and the second nut 3 to move toward each other, the unlocker 6 is provided with two first limiting grooves 61, and the first limiting block 21 and the second limiting block 31 are respectively located in the two first limiting grooves 61 (that is, a partition plate is formed between the two first limiting grooves 61, and the partition plate is located between the first limiting block 21 and the second limiting block 31 or the partition plate is placed between the first nut 2 and the second nut 3). When driving, the unlocker 6 is moved in the opposite direction to the same driving direction to counteract the force toward the side opposite to the driving direction, so that the nut located away from the driving direction moves toward the side opposite to the driving direction to complete the unlocking.

[0039] Further optimizations include, for example Figure 3 As shown, in order to limit and guide the movement of the unlocker 6, a guide rod 51 is provided on the first anti-rotation member 5. The axial direction of the guide rod 51 is consistent with the axial direction of the lead screw 1. The guide rod 51 passes through the unlocker 6, so that the unlocker 6 can only move along the axial direction of the lead screw 1.

[0040] In embodiment one, the locking element 4 can be a spring, tension spring, spring sheet, or soft rubber pad. The locking element 4 is disposed between the first nut 2 and the second nut 3. By applying a pushing or pulling force to both sides through the locking element 4, the first nut 2 and the second nut 3 abut against the opposite side of the nut of the screw 1. The locking element 4 can also be composed of two magnets respectively disposed on the first nut 2 and the second nut 3. The magnetic pole directions of the two magnets are adaptively adjusted according to the design. If the magnetic poles on the side where the two magnets are close to each other are the same, the first nut 2 and the second nut 3 move in opposite directions. If the magnetic poles on the side where the two magnets are close to each other are different, the first nut 2 and the second nut 3 move towards each other.

[0041] Example 2, as Figures 4-6As shown, this application also has an embodiment two in addition to embodiment one. The difference between embodiment two and embodiment one is that the unlocking component includes a second anti-rotation component 7, which is sleeved on the first nut 2 and the second nut 3. When the second anti-rotation component 7 rotates in different directions, it causes the first nut 2 or the second nut 3 to rotate in the opposite direction to the force. Specifically, the structure can be as follows: the second anti-rotation component 7 is provided with a second limiting groove 71 on the annular side of the first nut 2 and the second nut 3; a third limiting block 22 is provided on the annular side of the first nut 2; and a fourth limiting block 32 is provided on the annular side of the second nut 3. The third limiting block 22 and the fourth limiting block 32 are connected in a series. All the position blocks 32 are engaged in the second limiting groove 71. Thus, during driving (the lead screw 1 is the passive component, and the others (first nut 2, second nut 3, first anti-rotation component 5, and second anti-rotation component 7, etc.) are the active components), when the locking component 4 makes the first nut 2 and the second nut 3 abut against the opposite side of the thread of the lead screw 1, when the second anti-rotation component 7 rotates relative to the first nut 2 and the second nut 3, it contacts one of the third limiting block 22 and the fourth limiting block 32, so that the corresponding nut generates a torque, thereby canceling the force on the nut and completing the unlocking. Depending on the driving direction, the second anti-rotation component 7 rotates in different directions.

[0042] Example 3, as Figures 7-11As shown, this application also has a third embodiment in addition to the above embodiments. The difference between the third embodiment and the above embodiments is that: the unlocking component includes a third anti-rotation component 8 and a lever component 9. The third anti-rotation component 8 is sleeved on the first nut 2 and the second nut 3. The third anti-rotation component 8 is provided with a third limiting groove 81 on the annular side of the first nut 2 and the second nut 3. The first nut 2 and the second nut 3 are respectively provided with a first slot 23 and a second slot 33 on the side close to each other. The lever component 9 includes a locking plate 91 and a locking strip 92 provided on one side of the locking plate 91. The locking plate 91 is provided in the third limiting groove 81 (here, the locking plate 91 can be inclined and provided in the third limiting groove 81, that is, the length direction of the locking plate 91 is different from the axial direction of the lead screw 1, or the top head 93 can be provided on both sides of the locking plate 91 (both ends of the axial direction of the lead screw 1). That is, when the third anti-rotation component 8 rotates, it only interacts with the locking plate 91. One end of the locking bar 92 is in contact with the first locking groove 23 and the second locking groove 33 respectively. Thus, during driving (the lead screw 1 is the passive component, and the others (the first nut 2, the second nut 3, the first anti-rotation component 5, and the third anti-rotation component 8, etc.) are the active components), when the locking component 4 causes the first nut 2 and the second nut 3 to abut against the opposite side of the thread of the lead screw 1, when the third anti-rotation component 8 rotates relative to the first nut 2 and the second nut 3, it abuts against one end of the locking plate 91, causing the locking plate 91 to rotate, so that the first nut 2 and the second nut 3 are subjected to torques in opposite directions. The first nut 2 and the second nut 3 rotate in different directions, thereby counteracting the force exerted by the locking component 4 on the first nut 2 and the second nut 3, and completing the unlocking. By adding a lever component 9 between the second anti-rotation component 7 and the nut, the unlocking force is amplified by the lever component 9 and applied to the first nut 2 and the second nut 3, which can reduce the unlocking resistance.

[0043] For Embodiments 2 and 3, the locking element 4 can be a torsion spring, with both ends of the torsion spring respectively set on the first nut 2 and the second nut 3, thereby subjecting the first nut 2 and the second nut 3 to opposite torques to achieve the effect of eliminating gaps. Of course, the locking element 4 can also be a spring, tension spring, spring sheet or soft rubber pad. In this case, there are two locking elements 4. The two locking elements 4 respectively give the first nut 2 and the second nut 3 opposite rotational forces. Taking Embodiment 2 as an example, the two locking elements 4 can be respectively set on the third limiting block 22 and the fourth limiting block 32 on different sides of the screw 1 in the circumferential direction to apply opposite rotational forces to the first nut 2 and the second nut 3.

[0044] The working principle of this utility model is as follows: The unlocking component 4 applies a driving force opposite to the direction of the force to the first nut 2 or the second nut 3, thereby counteracting the pre-tightening pressure in the driving direction and achieving the purpose of unlocking. This allows the first nut 2 and the second nut 3 to move easily in the driving direction, and even if the pre-tightening force is too large, the transmission efficiency will not be reduced.

[0045] The above are merely preferred embodiments of this application, and the present invention is not limited to the above embodiments. It is understood that other improvements and variations that can be directly derived or conceived by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included within the protection scope of the present invention.

Claims

1. A self-unlocking backlash-eliminating nut assembly, characterized in that, include: The screw (1), first nut (2), second nut (3), locking part (4) and unlocking part are provided. The first nut (2) and the second nut (3) are both threadedly connected to the screw (1). The locking member (4) is used to apply force to the first nut (2) and the second nut (3) respectively. The force causes the first nut (2) and the second nut (3) to move away from each other or closer to each other, so that the first nut (2) and the second nut (3) abut against the opposite sides of the thread of the screw (1); The unlocking component is used to apply a driving force to the first nut (2) or the second nut (3) in the opposite direction to the force.

2. The self-unlocking backlash-eliminating nut assembly according to claim 1, characterized in that: The unlocking component includes a first anti-rotation component (5), which is sleeved on the first nut (2) and the second nut (3). The first anti-rotation component (5) causes the first nut (2) and the second nut (3) to rotate synchronously.

3. The self-unlocking gap-eliminating nut assembly according to claim 2, characterized in that: The unlocking component also includes an unlocker (6), which is slidably disposed on the first anti-rotation component (5). The sliding direction of the unlocker (6) is the axial direction of the lead screw (1). The ring side of the first nut (2) and the ring side of the second nut (3) are both locked on the unlocker (6). When the unlocker (6) slides in different directions, it causes the first nut (2) or the second nut (3) to move in the opposite direction to the force.

4. The self-unlocking gap-eliminating nut assembly according to claim 3, characterized in that: The first anti-rotation member (5) is provided with a guide rod (51), the axial direction of the guide rod (51) is consistent with the axial direction of the lead screw (1), and the guide rod (51) passes through the unlocker (6).

5. The self-unlocking backlash-eliminating nut assembly according to claim 1, characterized in that: The unlocking component includes a second anti-rotation component (7), which is sleeved on the first nut (2) and the second nut (3). When the second anti-rotation component (7) rotates in different directions, it causes the first nut (2) or the second nut (3) to rotate in the opposite direction to the force.

6. The self-unlocking gap-eliminating nut assembly according to claim 1, characterized in that: The unlocking component includes a third anti-rotation component (8) and a lever component (9). The third anti-rotation component (8) is sleeved on the first nut (2) and the second nut (3). The third anti-rotation component (8) has a third limiting groove (81) on the circumferential side of the first nut (2) and the second nut (3). The first nut (2) and the second nut (3) are respectively provided with a first slot (23) and a second slot (33) on the side of the first nut (2) and the second nut (3) that are close to each other. The lever component (9) includes a locking plate (91) and a locking strip (92) disposed on one side of the locking plate (91). The locking plate (91) is disposed in the third limiting groove (81), and the two ends of the locking strip (92) are respectively locked in the first locking groove (23) and the second locking groove (33).

7. A self-unlocking backlash-eliminating nut assembly according to any one of claims 1-4, characterized in that: The locking element (4) is a spring, tension spring, spring sheet or soft rubber pad, and the locking element (4) is disposed between the first nut (2) and the second nut (3).

8. A self-unlocking backlash-eliminating nut assembly according to any one of claims 1-4, characterized in that: The locking element (4) includes two magnets respectively disposed on the first nut (2) and the second nut (3).

9. A self-unlocking backlash-eliminating nut assembly according to claim 5 or 6, characterized in that: The locking element (4) is a torsion spring, and the two ends of the torsion spring are respectively disposed on the first nut (2) and the second nut (3).

10. A self-unlocking backlash-eliminating nut assembly according to claim 5 or 6, characterized in that: The locking element (4) is a spring, tension spring, spring sheet or soft rubber pad. There are two locking elements (4), and the two locking elements (4) respectively cause the first nut (2) and the second nut (3) to move in opposite directions.

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