Driving mechanism with self-locking function

Abstract

The utility model belongs to the field of driving mechanisms, and particularly relates to a driving mechanism with a self-locking function. The utility model provides a driving mechanism with a self-locking function. The driving mechanism comprises a seat, the torsion spring is sleeved on the seat in an interference manner; and the driving piece rotates to drive the diameter of the torsional spring to expand so as to enable the torsional spring to rotate along with the torsional spring and reversely rotate to drive the diameter of the torsional spring to contract so as to limit reverse rotation of the torsional spring. According to the driving mechanism with the self-locking function, one-way rotation of the input end and the output end can be achieved, one-way rotation of one end can also be achieved, and the specific installation structure facilitates torque output and position adjustment in the installation process.

Description

Technical Field

[0001] This utility model belongs to the field of drive mechanisms, and specifically relates to a drive mechanism with a self-locking function. Background Technology

[0002] In existing rotary drive mechanisms, the input end rotates back and forth, driving the output end to rotate back and forth. When unidirectional rotation is required, a ratchet or a one-way bearing is added, which undoubtedly increases costs. Moreover, if a ratchet or one-way bearing is used, both the input and output ends can only rotate in one direction. Utility Model Content

[0003] The present invention provides a drive mechanism with a self-locking function, which can effectively solve the problems in the background art.

[0004] This utility model provides a drive mechanism with a self-locking function, including...

[0005] Seat;

[0006] An interference fit to a torsion spring mounted on the seat; and

[0007] A drive component that causes the torsion spring to rotate by expanding its diameter during rotation, and whose reverse rotation causes the torsion spring to shrink its diameter, thus limiting its reverse rotation.

[0008] As a further optimization of this utility model, the base is hollow; the driving component includes...

[0009] A turntable coaxial with and connected to one of the torsion arms of a torsion spring; and

[0010] A sleeve that houses a torsion spring and a turntable and drives the turntable to rotate has a polygonal opening in the middle of its sealed end.

[0011] As a further optimization of this utility model, the turntable is provided with a boss; the sleeve is provided with two notches that can be turned back and forth by rotating a certain angle to move the two torsion arms of the torsion spring back and forth, and the sleeve sealing end is provided with a slot to accommodate the boss rotating at a certain angle.

[0012] As a further optimization of this utility model, the turntable includes

[0013] A barrel-shaped first turntable, the inner wall of the closed end of the first turntable having internal teeth, and a boss located at the edge of the open end of the first turntable; and

[0014] A second turntable, shaped like a disc and with an arc-shaped side surface having an outer tooth pattern corresponding to the inner tooth pattern, is provided on the second turntable. The second turntable has a lever that extends beyond the side wall of the first turntable and bends outward to connect with one of the torsion arms of the torsion spring.

[0015] As a further optimization of this utility model, the end of the lever is provided with a groove for locking one of the torsion arms of the torsion spring.

[0016] As a further optimization of this utility model, the sealing end of the first turntable is provided with a number of first through holes arranged in a ring array; the second turntable is provided with an arc-shaped oval hole corresponding to the first through hole; the bolt passes through the arc-shaped oval hole and the first through hole to fix the first turntable and the second turntable.

[0017] As a further optimization of this utility model, it also includes an output shaft; one end face of the output shaft is provided with a threaded hole corresponding to the first through hole; a bolt passing through the first through hole fixes the output shaft to the sealing end of the first turntable by threaded connection with the threaded hole.

[0018] As a further optimization of this utility model, the outer bottom surface of the sealing end of the first turntable is provided with several protrusions; the end face of the output shaft connected to the sealing end of the first turntable is provided with grooves corresponding to the protrusions.

[0019] As a further optimization of this utility model, one end of the base is provided with a flange, and the flange is provided with several mounting holes, and the other end of the base is fitted with a torsion spring.

[0020] As a further optimization of this utility model, the first turntable is connected to the other end of the base and has a gap with the base; the height of the torsion spring is longer than that of the base, and the first turntable is partially sleeved inside the torsion spring.

[0021] This utility model provides a drive mechanism with a self-locking function, which can not only realize unidirectional rotation at both the input and output ends, but also realize unidirectional rotation at one end. Moreover, the unique installation structure facilitates the output of torque and the position adjustment during the installation process. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the external structure of this embodiment;

[0023] Figure 2 yes Figure 1 Schematic diagram of the cross-section structure;

[0024] Figure 3 This is a schematic diagram of the first turntable structure in this embodiment;

[0025] Figure 4 yes Figure 3 Another perspective structural diagram;

[0026] Figure 5 This is a schematic diagram of the second turntable structure in this embodiment;

[0027] Figure 6 This is a schematic diagram of the sleeve structure in this embodiment;

[0028] Among them, the base 1, flange 1a, torsion spring 2, first torsion arm 2a1, second torsion arm 2a2, first turntable 3, internal tooth 3a, boss 3b, protrusion 3c, second turntable 4, external tooth 4a, lever 4b, vertical part 4b1, horizontal part 4b2, lower protrusion 4b3, slot 4b4, oblong hole 4c, sleeve 5, notch 5a, slot 5b, opening 5c, and output shaft 6. Detailed Implementation

[0029] like Figure 1-6 As shown, this embodiment includes a base 1, a torsion spring 2, and a driving component.

[0030] The base 1 is a hollow cylindrical shape. To facilitate fixing, a flange 1a is provided at the lower end of the base 1 in this embodiment. The flange 1a has several mounting holes for fixing the base 1. In other embodiments, the base can also be an octagonal, nonagonal, or other polygonal prism shape, but the effect will be slightly inferior. Depending on the application scenario, the base 1 can also be solid.

[0031] In this embodiment, the torsion spring 2 is fitted onto the base 1 from the upper end. The inner diameter of the torsion spring 2 is slightly smaller than the outer diameter of the base 1, and an interference fit is used for installation. Therefore, during installation, the torsion spring 2 needs to be rotated in the opposite direction to expand its inner diameter and fit onto the base 1. After fitting, the torsion spring 2 can tightly wrap around the base 1. The two ends of the torsion spring 2 are respectively provided with torsion arms, wherein the torsion arm located at the upper end is the first torsion arm 2a1, and the torsion arm located at the lower end is the second torsion arm 2a2.

[0032] In this embodiment, the driving component is rotary driven. The driving component is connected to one of the torsion arms of the torsion spring 2. When the driving component rotates in one direction, it causes the inner diameter of the torsion spring 2 to expand, thereby allowing it to rotate relative to the seat 1 along with the driving component 2. At this time, the rotation of the driving component is unaffected or subject to minimal frictional resistance. When the driving component rotates in the opposite direction, the torsion spring 2 produces the opposite effect, its inner diameter contracts, thereby generating a greater frictional resistance that prevents the driving component from rotating, thus forming a reverse self-locking function.

[0033] Furthermore, the driving component in this embodiment includes a turntable and a sleeve 5. The turntable includes a first turntable 3 and a second turntable 4.

[0034] The first turntable 3 is barrel-shaped, and its outer diameter is equal to that of the base 1. The first turntable 3 is coaxial with the base 1 and located above the base 1. The open end of the first turntable 3 faces upward. It is best to set a certain gap between the first turntable 3 and the base 1 to avoid friction between the first turntable 3 and the base 1 when the first turntable 3 rotates.

[0035] The inner sidewall of the bottom of the first turntable 3 is provided with internal teeth 3a, and the edge of the upper end of the first turntable 3 is provided with a boss 3b. In this embodiment, the size of the boss 3b does not exceed the thickness of the sidewall of the first turntable 3.

[0036] The second turntable 4 is disc-shaped and its size corresponds to the inner diameter of the first turntable 3. The arc side of the second turntable 4 is provided with external teeth 4a corresponding to the internal teeth 3a. The second turntable 4 is installed at the bottom of the first turntable 3. The external teeth 4a and the internal teeth 3a mesh perfectly so that the rotation of the first turntable 3 or the second turntable 4 can drive each other to rotate.

[0037] The second turntable 4 is also provided with a lever 4b, which includes a vertical part 4b1 erected on the second turntable 4 and a horizontal part 4b2 perpendicular to the vertical part 4b1. The vertical part 4b1 is slightly higher than the side wall of the first turntable 3, so that the horizontal part 4b2 can bend out from above the first turntable 3. The end of the horizontal part 4b2 is provided with a downward protrusion 4b3, and the downward protrusion 4b3 is provided with a groove 4b4. After the turntable is installed, the groove 4b4 can precisely lock the first torsion arm 2a1. Furthermore, in this embodiment, the height of the torsion spring 2 is longer than that of the seat 1, and the first turntable 3 is partially sleeved inside the torsion spring 2, which can reduce the height of the downward protrusion 4b3.

[0038] The structure of the turntable in this embodiment can adjust the installation angle of the second turntable 4 relative to the first turntable 3, providing adjustment for the installation of the sleeve 5 and the torsion spring 2. In other embodiments, the first turntable 3 and the second turntable 4 can be made into a single unit. Although this structure is simpler, it requires higher machining precision. Slight machining errors may make it difficult to install the torsion spring 2 or make it impossible to adjust it after installation.

[0039] Furthermore, in this embodiment, a plurality of first through holes are arranged in a ring array at the lower end of the first turntable 3, and an arc-shaped oval hole 4c is provided on the second turntable 4 corresponding to the first through holes. Bolts pass through the arc-shaped oval hole 4c and the first through holes to fix the first turntable 3 and the second turntable 4. The oval hole 4c provides space for adjusting the angle of the second turntable 4 relative to the first turntable 3.

[0040] The sleeve 5 is also barrel-shaped. The sleeve 5 fits the turntable and the torsion spring 2 from top to bottom. The side wall of the sleeve 5 has at least two notches 5a. The two notches 5a correspond to the horizontal part 4b2 of the first torsion arm 2a1 and the lever 4b, respectively. This ensures that the sleeve 5 can fit the turntable and the torsion spring 2. At the same time, the width of the notch 5a can limit the torsion angle of the torsion spring 2. Therefore, the notch 5a must have a certain width.

[0041] The upper end of the sleeve 5 has a slot 5b corresponding to the boss 3b. The slot 5b is arc-shaped and can accommodate the boss 3b rotating at a certain angle. After the sleeve 5 rotates around its axis by a certain angle, it can push the boss 3b to rotate.

[0042] In this embodiment, the upper end of the sleeve 5 serves as the input end. The middle part of the upper end of the sleeve 5 is provided with a hexagonal opening 5c. A hexagonal wrench or handle corresponding to the size of the opening 5c ​​is inserted into the opening 5c. Rotating the handle or wrench will drive the sleeve 5 to rotate, and the rotation of the sleeve 5 will drive the turntable to rotate.

[0043] Furthermore, this embodiment also includes an output shaft 6, the centerline of which is collinear with the centerline of the base 1. The upper end of the output shaft 6 is inserted into the base 1 from bottom to top and fixed to the bottom of the first turntable 3. Specifically, a threaded hole corresponding to the first through hole is provided on the upper end face of the output shaft 6. A bolt passing through the first through hole fixes the output shaft 6 to the first turntable 3 by threaded connection with the threaded hole. This makes full use of the first through hole, so that one bolt fixes both the first turntable 3 and the second turntable 4, as well as the first turntable 3 and the output shaft 6.

[0044] Furthermore, the outer bottom surface of the sealing end of the first turntable 3 is provided with several protrusions 3c, and the end face of the output shaft 6 connected to the sealing end of the first turntable 3 is provided with a corresponding groove. The shape and position of the groove correspond to the protrusions 3c, so that when the output shaft 6 is fixed to the first turntable 3, the protrusions 3 are just inserted into the groove. In this way, the first turntable 3 drives the output shaft 6 to rotate through the protrusions 3c, avoiding the damage to the bolts caused by simply using bolts to drive it, and also improving the torque.

[0045] In this embodiment, under normal conditions, the lever 4b is in the middle position of the corresponding notch 5a. When the output shaft is the active rotating end, only unidirectional rotation can be achieved. When the sleeve 5 is the active rotating end, in addition to normal unidirectional rotation, the relative position of the boss 3b in the slot 5b can be changed by rotating the sleeve 5, thereby causing the notch 5a to interact with the second torsion arm 2a2 and achieve bidirectional rotation. That is to say, this embodiment can achieve unidirectional self-locking, that is, one end can only rotate in one direction, while the other end can rotate in both directions.

[0046] It should be noted that the terms of "upper," "lower," "top," "bottom," "front," and "rear" used in this application are based on the accompanying drawings in the specification and are only used to clearly and simply express the technical solution, and do not imply any limitation on the scope of protection.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A drive mechanism with a self-locking function, characterized in that, include Seat; An interference fit to a torsion spring mounted on the seat; and A driving component that, due to rotation, causes the diameter of a torsion spring to expand, causing the torsion spring to rotate accordingly, and conversely, due to rotation in the opposite direction, causes the diameter of the torsion spring to contract, thus limiting its reverse rotation; the driving component includes... A turntable coaxial with and connected to one of the torsion arms of a torsion spring; and A sleeve that holds a torsion spring and a turntable and can drive the turntable to rotate.

2. The drive mechanism with self-locking function according to claim 1, characterized in that, The base is hollow; the middle of the sleeve sealing end has a polygonal opening.

3. The drive mechanism with self-locking function according to claim 1, characterized in that, The turntable has a boss; the sleeve has two notches that allow the two torsion arms of the torsion spring to be turned back and forth by rotating back and forth at a certain angle, and the sealed end of the sleeve has a slot to accommodate the boss rotating at a certain angle.

4. The drive mechanism with self-locking function according to claim 1, characterized in that, Turntable includes The first turntable is barrel-shaped, with internal teeth on the inner wall of the closed end of the first turntable, and a boss is located on the edge of the open end of the first turntable. as well as A second turntable, shaped like a disc and with an arc-shaped side surface having an outer tooth pattern corresponding to the inner tooth pattern, is provided on the second turntable. The second turntable has a lever that extends beyond the side wall of the first turntable and bends outward to connect with one of the torsion arms of the torsion spring.

5. A drive mechanism with self-locking function according to claim 4, characterized in that, The end of the lever is provided with a slot for engaging one of the torsion arms of the torsion spring.

6. A drive mechanism with self-locking function according to claim 4, characterized in that, The sealing end of the first turntable is provided with several first through holes arranged in a ring array; the second turntable is provided with an arc-shaped oval hole corresponding to the first through hole; bolts pass through the arc-shaped oval hole and the first through hole to fix the first turntable and the second turntable.

7. A drive mechanism with self-locking function according to claim 6, characterized in that, It also includes an output shaft; one end of the output shaft is provided with a threaded hole corresponding to the first through hole; a bolt passing through the first through hole fixes the output shaft to the sealing end of the first turntable by threaded connection with the threaded hole.

8. A drive mechanism with self-locking function according to claim 7, characterized in that, The outer bottom surface of the sealing end of the first turntable has several protrusions; the end face of the output shaft connected to the sealing end of the first turntable has corresponding protrusions with grooves.

9. A drive mechanism with self-locking function according to claim 1, characterized in that, One end of the base is provided with a flange, which has several mounting holes, and the other end of the base is fitted with a torsion spring.

10. A drive mechanism with self-locking function according to claim 9, characterized in that, The first turntable is connected to the other end of the base and has a gap with the base; the height of the torsion spring is longer than that of the base, and the first turntable is partially fitted inside the torsion spring.

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