Opening and closing lid drive mechanism and smart toilet using it

Abstract

This utility model discloses a lid opening and closing drive device and a smart toilet using the same, comprising at least: a housing, an output shaft, and a torsion spring for use; wherein the movable pin of the torsion spring is used to connect with the output shaft, and the fixed pin of the torsion spring is used to connect with the housing; the housing is provided with an inner limiting part and an outer limiting part concentrically distributed; the inner limiting part is adapted to form a clearance fit with the inner hole of the torsion spring, and the wall surface of the outer limiting part facing the inner limiting part is adapted to form a clearance fit with the outer peripheral side wall of the torsion spring; a support part is designed on the wall surface of the inner limiting part facing the outer limiting part, which protrudes radially along the torsion spring; when the movable pin moves synchronously with the operation of the output shaft, the support part is located on the opposite side of the resultant force of the forces acting on the movable pin and the fixed pin, and supports the inner hole wall surface of the torsion spring to avoid or reduce the degree of tilting or deflection of the torsion spring in the direction of the resultant force, thereby avoiding mutual friction between the torsion spring and the outer limiting part.

Description

Technical Field

[0001] This utility model relates to the field of smart home equipment technology, and in particular to a lid opening and closing drive device and a smart toilet using the same. Background Technology

[0002] Smart toilets are among the most popular smart home products. The use of a smart toilet relies heavily on its automatically opening and closing toilet seat, which requires an automatic lid-opening and closing mechanism. Specifically, the general principle of existing automatic lid-opening and closing mechanisms involves the interaction of a motor, a reduction gear set, an output shaft, and a torsion spring mounted on the output shaft. When the automatic lid-opening and closing mechanism closes the toilet seat or lid, it compresses the torsion spring, storing torque. When the toilet seat or lid is opened, the torsion spring gradually releases this torque, providing assistance.

[0003] Specifically, in existing smart toilet lid opening and closing mechanisms, the torsion spring is typically mounted on a mounting post. The torsion spring generally operates by compressing or stretching its two ends under pressure. During operation, the torsion spring undergoes radial deformation. Therefore, a certain gap is usually created between the outer wall of the mounting post and the inner wall of the torsion spring. For small flip-top mechanisms, the torsion spring is prone to tilting to one side under pressure, often contacting the annular wall on the outer side of the mounting post. This can lead to damage to the annular wall and stress at the points of repeated contact between the torsion spring and the annular wall, reducing the torsion spring's durability over long-term use. To address this, CN111743447B discloses an opening and closing component drive device. This device designs the inner circumferential surface of the housing surrounding the spring portion as a first inner circumferential surface portion and a second inner circumferential surface portion, with the second inner circumferential surface portion located radially outward from the first inner circumferential surface portion. The second inner circumferential surface portion surrounds the output shaft end of the spring portion. Thus, if at least one turn of the spring portion is surrounded by the second inner circumferential surface portion from the end of the winding on the output shaft side, the risk of the first turn on the output shaft side contacting the housing is reduced. Therefore, the risk of the auxiliary spring contacting the housing and thus reducing its durability is low. Furthermore, the spring section can be designed with a main body having a constant winding diameter and a smaller diameter portion located at the output shaft end. This way, by reducing the winding diameter at the output shaft end of the spring section, the clearance between the output shaft end and the housing can be further increased. Consequently, even if the output shaft end deforms due to load from the output shaft, the risk of contact between the output shaft end and the housing can be further reduced. Therefore, the risk of the auxiliary spring contacting the housing and thus reducing its durability can be further reduced.

[0004] For the aforementioned disclosed technical solutions, both the inner circumferential surface of the spring and the housing need to be adaptively designed according to the unexpected directional deformation of the spring during actual use. However, in reality, it is difficult to accurately distinguish the boundary between the deformed and undeformed parts in the axial dimension of the unexpected directional deformation of the spring under elastic action. Furthermore, the location of this boundary is different for springs with different elastic coefficients. In other words, for actual springs and housings, it is difficult to precisely control the axial dimension of the entire spring to increase the radial fit clearance. Therefore, this technical solution presents a significant design challenge in practical operation.

[0005] In summary, for the spring component used in the cover opening and closing drive device, how to reduce the problem of unexpected deformation and contact with the housing wall that may occur during use based on easy-to-operate means is a technical challenge that needs to be overcome. Utility Model Content

[0006] The primary objective of this invention is to provide a cover opening and closing drive device to solve the technical problem of reducing the probability of unexpected deformation of the spring used in its operation.

[0007] The second objective of this invention is to provide an intelligent toilet to solve the technical problem of optimizing its performance.

[0008] The opening and closing cover driving device of this utility model is implemented as follows: A cover opening and closing drive device includes at least: a housing, an output shaft, and a torsion spring for use; wherein the movable pin of the torsion spring is used to connect with the output shaft, and the fixed pin of the torsion spring is used to connect with the housing; The housing is provided with an inner limiting part and an outer limiting part that are concentrically distributed; the inner limiting part is adapted to form a clearance fit with the inner hole of the torsion spring, and the wall surface of the outer limiting part facing the inner limiting part is adapted to form a clearance fit with the outer peripheral side wall of the torsion spring. The inner limiting part is designed with a support part that protrudes radially along the torsion spring on the wall surface facing the outer limiting part; when the movable pin moves synchronously with the output shaft, the support part is located on the opposite side of the resultant force of the forces acting on the movable pin and the fixed pin, and forms support on the inner wall surface of the torsion spring.

[0009] In an optional embodiment of this invention, the contact surface of the support portion used to support the torsion spring is an arc surface.

[0010] In an optional embodiment of this invention, assuming the maximum central angle of the movable pin moving from its initial position to its limit position as the output shaft rotates is α, and the central angle of the support portion is β; then α / 2≤β<α.

[0011] In an optional embodiment of this invention, the support portion is distributed along the axial direction of the torsion spring; and The axial height of the support is not less than the axial length of the helical part of the torsion spring.

[0012] In an optional embodiment of this invention, the support portion is distributed along the axial direction of the torsion spring; and The axial height of the support portion is less than the axial length of the helical portion of the torsion spring, and the support portion is adapted to provide support for the portion of the inner wall of the torsion spring near the movable pin.

[0013] In an optional embodiment of this invention, the axial height of the support portion adapted to support the portion formed on the inner wall of the torsion spring is not less than the axial length of the portion of the torsion spring that is wound at least once from the movable pin.

[0014] In an optional embodiment of this utility model, when the torsion spring is not deformed by external force, there is a fitting gap between the support part and the inner wall surface of the torsion spring along the radial direction of the torsion spring.

[0015] In optional embodiments of this utility model, the support portion and the inner limiting portion are integrally injection molded; or The support part and the inner limiting part can be detached and assembled.

[0016] In an optional embodiment of this utility model, the cover opening and closing drive device further includes a drive assembly for driving the output shaft to rotate; The drive assembly includes a motor for outputting power and a gear transmission system for transmitting the power of the motor to the output shaft.

[0017] The intelligent toilet of this utility model is implemented as follows: A smart toilet includes at least: a toilet body, a toilet lid that cooperates with the toilet body, and the aforementioned opening and closing lid driving device disposed between the toilet lid and the toilet body.

[0018] By adopting the above technical solution, this utility model has the following beneficial effects: The opening and closing lid driving device and the smart toilet using it of this utility model, through the support part designed on the wall surface of the inner limiting part of the housing for mating with the torsion spring facing the outer limiting part, which is radially protruding along the torsion spring, when the movable pin moves synchronously with the operation of the output shaft, the support part is located on the opposite side of the resultant force of the forces on the movable pin and the fixed pin, forming support on the inner wall surface of the torsion spring, thereby avoiding or reducing the degree of tilting or deflection of the torsion spring in the direction of the resultant force, and avoiding mutual friction between the torsion spring and the outer limiting part, thereby protecting the outer limiting part of the housing and reducing the risk to the durability of the auxiliary spring. The structure of designing the support part directly on the inner limiting part is easy to process and operate, without the need for customized design of the torsion spring itself, nor the need to accurately calculate the proportion of the part of the torsion spring that may produce unexpected deformation under the force direction to the overall axial dimension of the torsion spring, thus reducing the design and processing difficulty of the overall structure. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the opening and closing cover driving device of this utility model; Figure 2 This is a schematic diagram of the torsion spring in the opening and closing cover driving device of this utility model; Figure 3 This is a schematic diagram of the structure of the torsion spring housing of the opening and closing cover driving device of this utility model; Figure 4 This is a schematic diagram of the housing and the mating structure of the torsion spring in the opening and closing cover driving device of this utility model. Figure 5 This is a schematic diagram of the structure of the support part of the torsion spring in the opening and closing cover driving device of this utility model; Figure 6 This is a schematic diagram of the movement process of the movable pin of the torsion spring in the opening and closing cover driving device of this utility model; Figure 7 The diagram shows the torsion spring of the cover opening and closing drive device. In the initial position, the movable pin is subjected to a force F1 due to the action of the output shaft, and the corresponding fixed pin is subjected to a force F2. The resultant force on the entire torsion spring is F_resultant, and the reverse extension line of F_resultant passes through the support part. Figure 8 The diagram shows the torsion spring of the opening and closing cover drive device. The movable pin is subjected to a force F1 due to the action of the output shaft between the initial position and the limit position. The corresponding fixed pin is subjected to a force F2. The resultant force on the entire torsion spring is F_resultant. The reverse extension line of F_resultant passes through the support part. Figure 9The diagram shows the torsion spring of the cover opening and closing drive device. When the movable pin is in its extreme position, it is subjected to a force F1 due to the action of the output shaft, and the corresponding fixed pin is subjected to a force F2. The resultant force on the entire torsion spring is F_resultant, and the reverse extension line of F_resultant passes through the support part.

[0020] In the figure: 1. Housing; 2. Output shaft; 3. Torsion spring; 31. Movable pin; 32. Fixed pin; 4. Motor; 5. Gear transmission system; 6. Inner limiting part; 7. Outer limiting part; 8. Annular receiving cavity; 81. Locking groove; 9. Support part. Detailed Implementation

[0021] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0022] Example 1: Please see Figures 1 to 9 As shown, this embodiment provides a cover opening and closing drive device, which includes at least: a housing 1, an output shaft 2 and a torsion spring 3 for use; wherein the movable pin 31 of the torsion spring 3 is used to connect with the output shaft 2, and the fixed pin 32 of the torsion spring 3 is used to connect with the housing 1.

[0023] It is understood that the opening and closing cover driving device of this embodiment also includes a driving component for driving the output shaft 2 to rotate; the driving component includes a motor 4 for outputting power and a gear transmission system 5 for transmitting the power of the motor 4 to the output shaft 2. The motor 4 and gear transmission system 5 can be any mature means from the prior art, and this embodiment does not absolutely limit their specific structure and implementation principle. When the output shaft 2 rotates along the first rotation direction under the action of the driving component, it compresses the torsion spring 3, causing the torsion spring 3 to store force, thus generating an auxiliary force that applies force to the output shaft 2 along a second rotation direction opposite to the first rotation direction.

[0024] Regarding the cooperation between the movable pin 31 of the torsion spring 3 and the output shaft 2, mature methods in the prior art can be adopted, such as, but not limited to, the means disclosed in announcement number CN222997811U. This embodiment does not make an absolute limitation on this. That is, as long as a reliable cooperation between the output shaft 2 and the movable pin 31 of the torsion spring 3 can be achieved so that the torsion spring 3 can move with the rotation of the output shaft 2 and the torsion spring 3 can be deformed and store force, the usage requirements of this embodiment can be met.

[0025] The cooperation between the torsion spring 3 and the housing 1 will be explained in detail in this embodiment with reference to the accompanying drawings: First, the housing 1 is provided with an inner limiting part 6 and an outer limiting part 7 that are concentrically distributed. An annular receiving cavity 8 is formed between the inner limiting part 6 and the outer limiting part 7, which is radially distributed along the torsion spring 3. The torsion spring 3 can be placed entirely into the annular receiving cavity 8. Of course, in order to cooperate with the fixing pin 32 of the torsion spring 3, the annular receiving cavity 8 is designed with an outwardly extending locking groove 81 for limiting the fixing pin 32. The specific structure and implementation principle of the locking groove 81 can also adopt mature technical means, and this embodiment does not make an absolute limitation on this.

[0026] Based on the above structure, it should be noted that the inner limiting part 6 is adapted to form a clearance fit with the inner hole of the torsion spring 3, and the wall surface of the outer limiting part 7 facing the inner limiting part 6 is adapted to form a clearance fit with the outer peripheral sidewall of the torsion spring 3. It can be understood that both the inner limiting part 6 and the outer limiting part 7 are approximately circular in cross-section to accommodate the needs of the torsion spring 3. It should be noted that the clearance fit here refers to the fact that when the torsion spring 3 is not subjected to external force, neither the wall surface of the inner limiting part 6 facing the outer limiting part 7 nor the wall surface of the outer limiting part 7 facing the inner limiting part 6 will have radial contact with the torsion spring 3. Therefore, it can be understood that the radial clearance between the inner limiting part 6 and the outer limiting part 7 and the torsion spring 3 will not be too large.

[0027] Furthermore, in this embodiment, the inner limiting part 6 facing the outer limiting part 7 has a support part 9 that protrudes radially along the torsion spring 3. It should be noted that when the torsion spring 3 is not deformed by external force, there is a radial fitting clearance between the support part 9 and the inner wall of the torsion spring 3. That is to say, the design of the support part 9 not only does not affect the assembly of the torsion spring 3 and the housing 1, but also ensures that the torsion spring 3 itself does not contact the support part 9 when the movable pin 31 of the torsion spring 3 needs to move with the output shaft 2. Therefore, the design of the support part 9 does not create resistance to the initial deformation of the torsion spring 3. Based on this, when the movable pin 31 moves synchronously with the output shaft 2, the support part 9, located on the opposite side of the resultant force of the forces acting on the movable pin 31 and the fixed pin 32, provides support to the inner wall of the torsion spring 3, thereby preventing or reducing the degree to which the torsion spring 3 tilts or deflects in the direction of the resultant force. It is understandable that when the support part 9 is not designed, the torsion spring 3 may tilt or deform in a reasonable direction, especially the axial part near the movable pin 31, due to the force exerted on the movable pin 31 and the fixed pin 32. This would cause the torsion spring 3 to form frictional contact with the wall surface of the outer limiting part 7 towards the inner limiting part 6. The support part 9 can provide support to the torsion spring 3 in the opposite direction of the resultant force, thereby resisting the tendency of tilting or deformation and avoiding or reducing the degree of deformation or tilting of the torsion spring 3 in the direction of the resultant force. This ensures that the torsion spring 3 will not form frictional contact with the wall surface of the outer limiting part 7 towards the inner limiting part 6 even when under stress.

[0028] In this regard, as an example of an optional implementation, the contact surface of the support part 9 for supporting the torsion spring 3 is an arc surface. This design allows the contact surface of the support part 9 and the torsion spring 3 to be better matched.

[0029] Additionally, it is necessary to note that, see [reference] Figure 6 Assuming the maximum central angle of the moving pin 31 from its initial position to its limit position as the output shaft 2 rotates is α (the direction of movement is...), Figure 6 (f in the middle), see also Figure 5The central angle of the support part 9 is β; therefore, α / 2 ≤ β < α. Based on this structure, as the output shaft 2 rotates, regardless of the position of the movable pin 31 within its maximum range of motion, the reverse extension line of the resultant force on the torsion spring 3 always passes through the support part 9. This ensures that the support part 9 can reliably support the movable pin 31 within its maximum range of motion, avoiding situations such as a lack of support at the extreme movement position of the movable pin 31. Specifically, theoretically, β = α / 2 would ensure that the movable pin 31 receives reliable support from the support part 9 as it moves from its initial position to its extreme position with the rotation of the output shaft 2. However, in this case, the support part 9 and the movable pin 31 form a line contact at the initial and extreme positions with the rotation of the output shaft 2, which is relatively weak. Therefore, a margin is required. Thus, β = α / 2 + 5°, thereby ensuring that the support part 9 and the movable pin 31 form a surface contact at the initial and extreme positions with the rotation of the output shaft 2.

[0030] Please see Figures 7 to 9 As shown, Figure 7 It is shown that the active pin 31 is subjected to a force F1 due to the action of the output shaft 2 in the initial position, and the corresponding fixed pin is subjected to a force F2. Then the resultant force of the whole torsion spring is F_resultant, and the reverse extension line of F_resultant passes through the support part 9. Figure 8 It is shown that the movable pin 31 is subjected to a force F1 due to the action of the output shaft 2 between the initial position and the extreme position, and the corresponding fixed pin 32 is subjected to a force F2. Then the resultant force on the whole torsion spring is F_resultant, and the reverse extension line of F_resultant passes through the support part 9. Figure 9 The diagram shows that when the movable pin 31 is in its extreme position, it is subjected to a force F1 due to the action of the output shaft 2, and the corresponding fixed pin 32 is subjected to a force F2. The resultant force on the overall torsion spring 3 is F_resultant, and the reverse extension line of F_resultant passes through the support part 9.

[0031] Next, it should be noted that in the first optional implementation, from the perspective of simplifying the manufacturing process and reducing design difficulty, the support portion 9 of this embodiment is distributed along the axial direction of the torsion spring 3; and the axial height of the support portion 9 is not less than the axial length of the helical portion of the torsion spring 3. Therefore, when the torsion spring 3 moves from its initial position to its limit position as the movable pin 31 moves with the output shaft 2, and the torsion spring 3 may tilt or deform in the direction of the resultant force in its overall axial dimension, the support portion 9 can provide support to the inner wall of the torsion spring 3. In other words, regardless of the actual proportion of the torsion spring 3 that may tilt or deform in the direction of the resultant force when the movable pin 31 moves and deforms under force, this embodiment does not need to consider this. It is only necessary to ensure that the wall surface of the support portion 9 and the torsion spring 3 that forms a supporting fit extends axially from one axial end to the other. This reduces the difficulty of designing and manufacturing the support portion 9, thereby reducing production costs.

[0032] Alternatively, in the second optional implementation, the support portion 9 is distributed along the axial direction of the torsion spring 3; and the axial height of the support portion 9 is less than the axial length of the helical portion of the torsion spring 3, and the support portion 9 is adapted to provide support for the portion of the inner wall of the torsion spring 3 near the movable pin 31. Specifically, the axial height of the support portion 9 that provides support for the portion of the inner wall of the torsion spring 3 is not less than the axial length of the portion of the torsion spring 3 that is wound at least once from the movable pin 31. Here, the axial dimension of the support portion 9 can be determined by calculating and testing the proportion of the portion of the torsion spring 3 that may tilt or deform in the direction of the resultant force when the movable pin 31 moves and the torsion spring 3 is deformed by force, relative to the overall axial dimension of the torsion spring 3. This approach is more difficult to operate than the first implementation, but it still meets the usage requirements of this embodiment.

[0033] Furthermore, regarding the support portion 9 of this embodiment, it is necessary to explain that, considering that most housings 1 are injection molded, in one embodiment, the support portion 9 and the inner limiting portion 6 are integrally injection molded. This method is easy to process and has low processing costs. In another embodiment, the support portion 9 and the inner limiting portion 6 are detachably assembled. In this case, the support portion 9 and the inner limiting portion 6 can adopt a concave-convex mating plug-in structure. Since the support portion 9 is arranged using the mating gap between the inner limiting portion 6 and the torsion spring 3, the dimensional accuracy requirements of the support portion 9 along the radial direction of the torsion spring 3 are high. For products with higher precision, the defect rate is also higher. Therefore, separate processing can avoid the situation where the housing 1 is affected by the substandard processing accuracy of the support portion 9.

[0034] In summary, for the opening and closing cover drive device of this embodiment, by designing a support portion 9 that protrudes radially along the torsion spring 3 on the wall surface of the inner limiting portion 6 of the housing 1 for engaging the torsion spring 3 towards the outer limiting portion 7, when the movable pin 31 moves synchronously with the operation of the output shaft 2, the support portion 9 is located on the opposite side of the resultant force of the forces acting on the movable pin 31 and the fixed pin 32, and supports the inner wall surface of the torsion spring 3. This avoids or weakens the degree of tilting or deflection of the torsion spring 3 towards the direction of the resultant force, thereby preventing the torsion spring 3 from rubbing against the outer limiting portion 7. This protects the outer limiting portion 7 of the housing 1 and reduces the risk of damage to the auxiliary spring.

[0035] Example 2: Based on the lid opening and closing drive device of Embodiment 1, this embodiment provides a smart toilet, which includes at least: a toilet body, a lid that cooperates with the toilet body, and a lid opening and closing drive device as in Embodiment 1 disposed between the lid and the toilet body.

[0036] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0037] In the description of this utility model, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0041] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. A lid opening and closing drive device, characterized in that, It includes at least: a housing, an output shaft, and a torsion spring for use; wherein the movable pin of the torsion spring is used to connect with the output shaft, and the fixed pin of the torsion spring is used to connect with the housing; The housing is provided with an inner limiting part and an outer limiting part that are concentrically distributed; the inner limiting part is adapted to form a clearance fit with the inner hole of the torsion spring, and the wall surface of the outer limiting part facing the inner limiting part is adapted to form a clearance fit with the outer peripheral side wall of the torsion spring. The inner limiting part is designed with a support part that protrudes radially along the torsion spring on the wall surface facing the outer limiting part; when the movable pin moves with the rotation of the output shaft, the support part is located on the opposite side of the resultant force of the forces acting on the movable pin and the fixed pin, and forms support on the inner wall surface of the torsion spring.

2. The cover opening and closing drive device according to claim 1, characterized in that, The contact surface of the support part used to support the torsion spring is an arc surface.

3. The cover opening and closing drive device according to claim 2, characterized in that, Assuming the maximum central angle of the moving pin moving from its initial position to its limit position as the output shaft rotates is α, and the central angle of the support is β; then α / 2≤β<α。 4. The cover opening and closing drive device according to any one of claims 1 to 3, characterized in that, The support portion is distributed along the axial direction of the torsion spring; and The axial height of the support is not less than the axial length of the helical part of the torsion spring.

5. The cover opening and closing drive device according to any one of claims 1 to 3, characterized in that, The support portion is distributed along the axial direction of the torsion spring; and The axial height of the support portion is less than the axial length of the helical portion of the torsion spring, and the support portion is adapted to provide support for the portion of the inner wall of the torsion spring near the movable pin.

6. The cover opening and closing drive device according to claim 5, characterized in that, The axial height of the support portion adapted to support the portion formed on the inner wall of the torsion spring is not less than the axial length of the portion of the torsion spring that is wound at least once from the movable pin.

7. The cover opening and closing drive device according to any one of claims 1 to 3, characterized in that, When the torsion spring is not deformed by external force, there is a fitting clearance between the support and the inner wall of the torsion spring along the radial direction of the torsion spring.

8. The cover opening and closing drive device according to any one of claims 1 to 3, characterized in that, The supporting part and the inner limiting part are integrally injection molded; or The support part and the inner limiting part can be detached and assembled.

9. The cover opening and closing drive device according to any one of claims 1 to 3, characterized in that, The cover opening and closing drive device also includes a drive component for driving the output shaft to rotate. The drive assembly includes a motor for outputting power and a gear transmission system for transmitting the power of the motor to the output shaft.

10. A smart toilet, characterized in that, At least including: A bucket body, a bucket lid that mates with the bucket body, and a lid opening / closing drive device as described in any one of claims 1 to 9, disposed between the bucket lid and the bucket body.

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