A housing assembly for a piezoelectric screw

Abstract

This invention discloses a housing assembly for a piezoelectric screw, belonging to the piezoelectric technology field. The housing assembly includes a first part and a second part joined along a first direction, with a first engagement area and a second engagement area between them. A fastener is provided corresponding to the first engagement area and can switch between a tightened state and a released state. A limiting unit includes a fixing part and a detachable part. The fixing part is located in the second engagement area and has a stop surface. The second end of the detachable part is fixed by the fastener in the first engagement area, and the first end abuts against the stop surface in the second engagement area along the first direction. When the fastener is switched to the released state, the first end disengages from the fixing part, releasing the restriction on the second engagement area. Through the linkage design of the detachable part and the fastener, the coordinated locking and releasing of the connection state of the first part and the second part at the two engagement areas is realized. Only a single fastener needs to be operated to simultaneously disassemble and assemble, significantly simplifying the structure and improving the convenience of maintenance and connection reliability.

Description

Technical Field

[0001] This invention relates to the field of piezoelectric technology, specifically to a housing assembly for a piezoelectric screw. Background Technology

[0002] Currently, in precision drive devices (especially those employing threaded piezoelectric actuators), housing assemblies are typically composed of multiple parts, such as a housing and a base that are assembled together. To ensure the stable operation of the internal actuators, the housing assembly not only needs sufficient structural strength but also requires reliable connection and positioning after assembly. Common connection methods include using screws, clips, or adhesives in multiple joint areas to prevent the two parts from loosening or separating under external forces or vibrations through multi-point fixation.

[0003] However, the existing technology has the following shortcomings: On the one hand, in order to ensure a reliable connection of multiple joint areas, it is often necessary to set multiple independent fasteners (such as multiple screws and their corresponding threaded holes) on the housing. This not only increases the number of parts and assembly steps, but also makes it easy for the overall connection to fail due to the loosening of a single fastener. On the other hand, the multi-point fastening structure makes the disassembly and assembly process of the housing cumbersome and inconvenient for equipment maintenance and replacement of internal actuating mechanisms. Summary of the Invention

[0004] The technical solution of the present invention is to provide a housing assembly for a piezoelectric screw. Through the linkage design of the detachable part and the fastener, the connection state of the first part and the second part at two joint areas is locked and released in a coordinated manner. Only a single fastener needs to be operated to disassemble and assemble simultaneously, which significantly simplifies the structure and improves the convenience of maintenance and the reliability of connection.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a housing assembly, characterized in that it comprises: A first portion and a second portion joined along a first direction, wherein at least a first joining area and a second joining area are provided between the first portion and the second portion; Fasteners for connecting the first portion and the second portion at the first engagement area; The fastener is configured to switch between a fastened state that prevents the first part and the second part from separating in the first engagement area and a released state that releases the fastened state in response to an external operation. The limiting unit includes: A fixing part is fixed to one of the first part and the second part in the second engagement area; the fixing part is provided with a stop surface; The detachable portion includes: a first end and a second end; the second end is fixed to the other of the first portion and the second portion at the first engagement area by a fastener in the fastened state; the first end abuts against the stop surface at the second engagement area along the first direction; The detachable portion is configured to allow the first end to detach from the fixing portion when the fastener switches to the release state in response to an external operation.

[0006] As a further aspect of the present invention, at least a portion of the detachable part is made of an elastic material; The detachable part is configured as follows: In response to the second end being secured by the fastener in a fastened state and the first end abutting against the stop surface, the detachable portion undergoes elastic deformation, so that the limiting unit applies a preload force to the first portion and the second portion in the second engagement area to prevent them from separating from each other.

[0007] As a further embodiment of the present invention, the fixing part is disposed in the first part; In the first direction, the detachable part is fixed to the side of the second part away from the first part by the fastener in the fastened state, and the side of the first end of the detachable part away from the first part abuts against the stop surface.

[0008] As a further aspect of the present invention, the first part includes a shell-shaped portion having an opening at at least one end in the first direction, and the second part includes a cover plate that engages with the opening.

[0009] As a further embodiment of the present invention, the fixing part is integrally formed with the first part at the edge of the opening.

[0010] As a further aspect of the present invention, at least a portion of the cover plate of the second part is embedded in the opening of the first part and is interference-fitted therewith.

[0011] As a further aspect of the invention, the second part has a groove on the side away from the first part for receiving the detachable part.

[0012] As a further aspect of the invention, the side of the second part away from the first part is provided with a clearance groove located in the first and second joint areas to provide clearance space for the detachable part.

[0013] As a further aspect of the invention, the fastener includes a screw that passes through the second portion from a side of the second portion away from the first portion along the first direction and connects to a threaded hole provided in the first portion, wherein the second end of the detachable portion is pressed between the screw and the second portion.

[0014] A piezoelectric screw includes: a housing assembly; and a piezoelectric actuation mechanism disposed within the housing assembly; The first part has an actuation mounting area whose contour is adapted to the outer contour of the piezoelectric actuation mechanism, and the actuating end of the piezoelectric actuation mechanism extends along the first direction and passes through the reserved hole in the housing assembly.

[0015] Compared with the prior art, the beneficial effects of the present invention are: In this invention, by setting a limiting unit consisting of a fixed part and a detachable part in the second joint area, and linking the second end of the detachable part with the fastener in the first joint area, the coordinated locking and releasing of the connection state of the first part and the second part at the two joint areas is achieved. During disassembly, only the fastener needs to be operated to switch it to the released state, which simultaneously releases the direct fastening of the first part and the second part in the first joint area and the indirect limiting of the first part and the second part in the second joint area. This simplifies the disassembly and assembly of multiple joint areas into a single operation, significantly simplifying the disassembly and assembly process and improving the convenience of maintenance and component replacement. At the same time, reliable fixing of the two joint areas can be achieved with a single fastener, reducing the number of fasteners, simplifying the structure, reducing costs, and effectively ensuring the overall connection reliability of the housing assembly. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall exploded structure of the present invention; Figure 3 This is a schematic diagram of the detachable part of the present invention in its installed state. Figure 4 This is a schematic diagram of the conventional first part of the structure of the present invention; Figure 5 This is a schematic diagram of the second part of the structure of the present invention; Figure 6 This is a schematic diagram of the installation state structure of the plurality of first ends of the present invention; Figure 7 This is a schematic diagram of the limiting unit of the present invention, which is a pin and a mating sleeve structure; Figure 8 This is a schematic diagram of the limiting unit of the present invention, which is a shaft and a bushing structure; Figure 9 This is a schematic diagram of the limiting unit of the present invention, which consists of a wedge-shaped female buckle and a wedge-shaped male buckle. Figure 10 This is a schematic diagram of the detachable plate-shaped part of the present invention; Figure 11 This is a schematic diagram of the detachable part of the rod-shaped structure of the present invention; Figure 12 This is a schematic diagram showing that the stop surface of the present invention is wavy; Figure 13 This is a schematic diagram showing that the stop surface of the present invention is serrated; Figure 14 This is a schematic diagram showing that the stop surface of the present invention is stepped. The attached diagram lists the components represented by each number as follows: 1. First part; 11. First mating area; 12. Second mating area; 13. Threaded hole; 14. Opening; 15. Relief groove; 16. Actuation mounting area; 17. Wiring mounting area; 2. Second part; 21. Groove; 22. Cover plate; 3. Fastener; 4. Fixing part; 41. Stop surface; 41-1. Inclined stop surface; 42. Notch; 5. Detachable part; 51. First end; 52. Second end; 6. Piezoelectric actuation mechanism. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 are within the scope of protection of the present invention.

[0019] The housing assembly provided by this invention is mainly used in piezoelectric screws, especially piezoelectric screws with high miniaturization requirements; Traditional piezoelectric screw housing assemblies typically employ multiple independent fastening points, such as screws, clips, or adhesive bonding in each mating area. (See [link to relevant documentation]). Figure 4 The housing components are connected and assembled through multi-point fastening. Because each joint area is relatively independent, each fastening point must be operated individually during disassembly and assembly, a cumbersome and inefficient process that hinders routine maintenance and rapid replacement of internal actuating mechanisms; see [link to relevant documentation]. Figure 2This invention achieves coordinated locking and releasing of the connection state of the first and second parts at two engagement areas through the linkage design of the detachable part 5 and the fastener 3. During disassembly, simply switching the fastener 3 to the released state simultaneously releases the limiting positions of the first engagement area 11 and the second engagement area 12, simplifying the disassembly and assembly of multiple engagement areas into a single operation, significantly improving the convenience of maintenance and component replacement. Simultaneously, a single fastener 3 can reliably fix both engagement areas, reducing the number of fasteners 3, simplifying the structure, lowering costs, and effectively ensuring the overall connection reliability of the housing assembly.

[0020] The technical solution of the present invention will be described in detail below with reference to specific embodiments: Please see Figures 1-3 The present invention provides a housing assembly comprising: A first part 1 and a second part 2 are joined along a first direction, and at least a first joining area 11 and a second joining area 12 are provided between the first part 1 and the second part 2; in this embodiment, the first part 1 is configured as a shell and the second part 2 is configured as an end cap. Fastener 3 is used to connect the first part 1 and the second part 2 at the first engagement area 11; Fastener 3 is configured to respond to external operations; switching between a tightened state and a loosened state: The fastened state is a state that prevents the first part 1 and the second part 2 from separating from each other at the first joint area 11; The release state is the release state that releases the fastening state, that is, the state that allows the first part 1 and the second part 2 to separate from each other at the first joint area 11. Specifically, fastener 3 includes a screw, which has a head and a shank. The head has a tool interface (such as an internal hexagonal socket, Phillips head, or slotted head) for external tool operation, and the shank has external threads. External operation refers to the operator applying rotational torque to the screw head manually or with the aid of a tool. As an optional solution, the external operation can also be achieved by tools or mechanisms such as wrenches, knobs, cam handles or quick-release levers. The fastener 3 can be in the form of bolts, buckles, wedges or eccentric cams, as long as it can respond to external operation to switch between the tight and loose states. The limiting unit includes: The fixing part 4 is fixed to one of the first part 1 and the second part 2 in the second joint area 12; in this embodiment, the fixing part 4 is fixed to the first part 1. The fixing part 4 is provided with a stop surface 41; the stop surface 41 is a contact part on the fixing part 4 that cooperates with the first end 51 of the detachable part 5, and is used to apply a blocking force to the first end 51. The resultant force direction or at least one component force direction of the blocking force is opposite to the separation direction of the first part 1 and the second part 2, so as to counteract the separation tendency of the housing assembly. The contact form of the stop surface 41 includes any one or more combinations of surface contact, line contact and point contact; The normal direction of the stop surface 41 forms an angle with the first direction. As an optional solution, see details. Figure 9 The middle dashed line section; In this embodiment, the stop surface 41 is a plane, while the stop surface 41 can be an irregularly shaped surface. As an optional solution, it includes, but is not limited to, other options. Figure 12 The wavy shape in the middle Figure 13 The serrated and Figure 14 The stepped shape in the middle, the corresponding surface of the first end 51 makes adaptive adjustments as the stop surface 41 changes, so that the two form surface contact; The detachable part 5 includes: a first end 51 and a second end 52; the number, shape, and position of the first end 51 and the second end 52 can be adaptively adjusted according to the connection requirements of the housing assembly to enhance the versatility and adaptability of the limiting unit; taking the number and position of the first end 51 as an example; see [link to relevant documentation]. Figure 6 The first end 51 can be any one or more; The second end 52 is fixed to the other of the first part 1 and the second part 2 by the fastener 3 in the first engagement area 11 in a fastened state; in this embodiment, the second end 52 is relatively fixed to the second part 2 in the fastened state of the first engagement area 11. The first end 51 abuts against the stop surface 41 in the second joint area 12 along the first direction to prevent the first part 1 and the second part 2 from separating from each other in the second joint area 12. The detachable part 5 is configured to allow the first end 51 to disengage from the fixed part 4 when the fastener 3 switches to the released state in response to an external operation, thereby releasing the restriction on the first part 1 and the second part 2 at the second engagement area 12. The housing assembly provided in this embodiment achieves coordinated locking and releasing of the two joint areas by setting a limiting unit composed of a fixing part 4 and a detachable part 5 in the second joint area 12, and linking the second end 52 of the detachable part 5 with the fastener 3 in the first joint area 11. During disassembly, it is only necessary to operate the fastener 3 to switch it to the released state, which simultaneously releases the direct fastening of the first part 1 and the second part 2 in the first joint area 11 and the indirect limiting of the first part 1 and the second part 2 in the second joint area 12. This simplifies the disassembly and assembly of multiple joint areas into a single operation, significantly simplifying the disassembly and assembly process and improving the convenience of maintenance and component replacement. At the same time, reliable fixing of the two joint areas can be achieved with a single fastener 3, reducing the number of fasteners 3, simplifying the structure, reducing costs, and effectively ensuring the overall connection reliability of the housing assembly.

[0021] As a further aspect of the present invention, at least a portion of the detachable part 5 is made of an elastic material; the elastic material may be selected from spring steel, beryllium bronze, elastic stainless steel, or other metallic elastic materials; The detachable part 5 is configured as follows: In response to the second end 52 being fixed by the fastener 3 in a fastened state, and the first end 51 abutting against the stop surface 41, the detachable part 5 undergoes elastic deformation, so that the limiting unit applies a pre-tightening force to the first part 1 and the second part 2 in the second engagement area 12 to prevent them from separating from each other. See Figure 3 During assembly, the first end 51 of the detachable part 5 is first brought into contact with the stop surface 41 of the fixed part 4 to complete the pre-positioning of the second joint area 12. At this time, there is a certain gap between the second end 52 and the mounting surface of the first joint area 11. Then, the fastener 3 is operated to put it into a tightened state, pressing the second end 52 into the first joint area 11. During this process, the detachable part 5 undergoes elastic bending deformation with the contact point between the first end 51 and the stop surface 41 as the fulcrum, thereby generating a pre-tightening force that continuously acts on the first part 1 and the second part 2 in the second joint area 12, pressing the two together.

[0022] The principle is that the first end 51 is used as a stop fulcrum, and the second end 52 is locked by the fastener 3, which forces the detachable part 5 to undergo elastic deformation. The rebound tendency is used to form a pre-tightening in the second joint area 12. The beneficial effect of this structure is that the pre-tightening force can effectively eliminate the assembly gap in the second joint area 12, prevent the housing assembly from loosening and making abnormal noise under vibration or impact conditions, and improve the connection reliability.

[0023] As a further embodiment of the present invention, the fixing part 4 is disposed in the first part 1; In the first direction, the detachable part 5 is fixed to the side of the second part 2 away from the first part 1 by the fastener 3 in a fastened state, and the side of the first end 51 of the detachable part 5 away from the first part 1 abuts against the stop surface 41. Specifically, the fixing part 4 extends from the outer wall of the first part 1 near the second part 2 toward the second part 2. During assembly, the first end 51 of the detachable part 5 is placed on the side of the second part 2 away from the first end 51, and it is pushed to move toward the fixing part 4 in a direction perpendicular to the first direction, so that the first end 51 abuts against the stop surface 41 of the fixing part 4. The first end 51 and the stop surface 41 are fixed in the first direction and remain free in a direction perpendicular to the first direction, which facilitates the quick assembly and disassembly of the detachable part 5 and the fixing part 4 of the second joint area 12. The second end 52 is pressed and fixed to the second part 2 by the fastener 3; when the fastener 3 is tightened, the second end 52 is fixed in the first direction vertically, thereby realizing the linkage of controlling the detachable part 5 through the fastener 3.

[0024] See Figure 1 and Figure 4 The piezoelectric screw includes a housing assembly and a piezoelectric actuator 6 disposed within the housing. The housing assembly is constrained by the piezoelectric actuator 6; to meet miniaturization requirements, the housing assembly must conform as closely as possible to the outer contour of the piezoelectric actuator 6 in the surrounding area where it is mounted. In conventional solutions, if a fastening bolt is directly installed in this area, the housing wall thickness must be increased to provide sufficient thread engagement length and structural strength, which inevitably increases the overall size of the housing and is detrimental to miniaturization.

[0025] In this invention, the shell-like portion adopts a structure extending in the first direction, making the stop surface 41 of the fixing portion 4 perpendicular to the first direction. In this way, the mounting positions of the fastener 3 and the limiting unit do not need to occupy the lateral wall thickness space of the shell. The side wall of the corresponding area of ​​the shell assembly can be designed to fit tightly with the outer contour of the piezoelectric actuator 6, avoiding the need to increase the wall thickness due to the fastening structure. Thus, while ensuring the reliability of the connection, the external size of the shell is effectively reduced, meeting the design requirements of miniaturization. The technical solution will be described in detail below with reference to specific embodiments: As a further aspect of the present invention, the first part 1 includes a shell-shaped portion having an opening 14 at at least one end in a first direction, and the second part 2 includes a cover plate 22 that engages with the opening 14. Specifically, the first part 1 is a hollow shell structure used to install the piezoelectric actuator 6, with one end forming an opening 14; the second part 2 is a cover plate 22, which covers the opening 14; the actuating end of the piezoelectric actuator 6 extends through the cover plate 22. The first joint area 11 and the second joint area 12 are respectively located on opposite sides or adjacent sides of the opening 14. The fastener 3 locks the cover plate 22 and the shell-shaped part in the first joint area 11, and the limiting unit limits the connection between the cover plate 22 and the shell-shaped part in the second joint area 12. The two work together to make the cover plate 22 fit evenly along the circumference of the entire opening 14.

[0026] The principle is that the first part 1 is designed as a shell-shaped part with an end cap, which facilitates the installation and removal of internal components; at the same time, the fasteners 3 and the limiting unit are fixed in coordination at different positions of the opening 14, so that the circumferential force of the cover plate 22 is balanced, avoiding the skewing or uneven gap caused by single-point fixing. Furthermore, the fixing part 4 and the detachable part 5 in the limiting unit have lower requirements for the wall thickness of the housing assembly compared to the multi-screw method. The fixing part 4 can be provided with the same wall thickness as the opening 14, thereby reducing the dimension of the housing assembly in the wall thickness direction. It is also possible to reduce the thickness requirement in the first direction by increasing the length L of the stop surface 41 and the first end 51 in the vertical direction in the first direction, which is beneficial to reducing the dimension of the housing assembly in the first direction.

[0027] As a further embodiment of the present invention, the fixing part 4 is integrally formed with the first part 1 at the edge of the opening 14; By designing the fixing part 4 and the first part 1 as an integral structure, the assembly gaps and weak points in the connection strength that may exist in the separate connection are eliminated. At the same time, the structural rigidity of the edge of the opening 14 directly bears the force of the limiting unit. The beneficial effects of this structure are: on the one hand, it eliminates the separate processing and assembly process of the fixing part 4, reduces the number of parts, and lowers the manufacturing cost; on the other hand, the integral molding structure avoids the loosening or fatigue failure that may occur in the separate connection during long-term use, the positional accuracy of the stop surface 41 is higher, and the cooperation with the detachable part 5 is more stable and reliable, thereby further improving the impact and vibration resistance of the housing assembly.

[0028] As a further embodiment of the present invention, at least a portion of the cover plate 22 of the second part 2 is embedded in the opening 14 of the first part 1 and is interference-fitted therewith. Specifically, the outer contour dimension of the flange is slightly larger than the inner contour dimension of the opening 14. During assembly, the cover plate 22 is pressed into the opening 14 through the flange, forming an interference fit with the inner wall of the opening 14, thereby achieving the pre-positioning of the second part 2 on the first part 1. Finally, the fastener 3 and the limiting unit complete the final locking.

[0029] The principle is that the radial clamping force generated by the interference fit allows the cover plate 22 to be initially fixed to the opening 14 before the fastener 3 is locked. Simultaneously, the mating surface between the flange and the inner wall of the opening 14 restricts their relative displacement in a plane perpendicular to the first direction, providing a stable assembly reference for the subsequent locking of the fastener 3 and the installation of the detachable part 5. The beneficial effects of this structure are: the interference fit eliminates the radial gap between the cover plate 22 and the opening 14, improving assembly positioning accuracy and preventing the cover plate 22 from skewing during tightening; the mating between the flange and the opening 14 effectively restricts the relative movement of the first part 1 and the second part 2 in a direction perpendicular to the first direction, improving the structural stability of the housing under lateral loads; at the same time, the interference fit itself has a certain anti-loosening capability, forming multiple fixing guarantees with the fastener 3 and the limiting unit, further improving the connection reliability of the housing assembly under vibration environments; in addition, the interference fit also plays a certain sealing role, reducing the risk of external dust or moisture entering the housing assembly.

[0030] As a further aspect of the present invention, the second part 2 is provided with a groove 21 for accommodating the detachable part 5 on the side away from the first part 1; Specifically, the groove 21 provides a recessed installation space for the detachable part 5, allowing the detachable part 5 to be embedded within the outer surface of the second part 2, thus achieving concealed assembly; reducing the size of the housing assembly in the first direction; As a further aspect of the present invention, the side of the second part 2 away from the first part 1 is provided with a clearance groove 15 located in the first joint area 11 and the second joint area 12 for providing clearance space for the detachable part 5; during installation, the first end 51 and the second end 52 can be further bent toward the first part 1 to increase the pre-tightening force of the detachable part 5; increase the positive pressure of the first part 1 and the second part 2 to improve the stability of the housing assembly.

[0031] As a further embodiment of the present invention, the fastener 3 includes a screw, which passes through the second part 2 from the side of the second part 2 away from the first part 1 along a first direction and is connected to a threaded hole 13 provided in the first part 1. The second end 52 of the detachable part 5 is pressed between the screw and the second part 2. A through hole is provided on the second part 2 corresponding to the first engagement area 11, and a threaded hole 13 is provided on the first part 1.

[0032] During assembly, first place the second end 52 of the removable part 5 at the through hole of the second part 2, then pass the shank of the screw through the mounting hole on the second end 52 and the through hole of the second part 2, screw it into the threaded hole 13 of the first part 1 and tighten it. At this time, the head of the screw presses the second end 52 of the removable part 5 against the outer side of the second part 2, so that the second end 52 is firmly clamped between the screw head and the second part 2.

[0033] The axial clamping force generated by the screw's threaded connection with the threaded hole 13 is used to fix the second end 52 of the detachable part 5 and the second part 2 together to the first part 1, thus enabling a single fastener 3 to simultaneously connect the first part 1 and the second part 2, as well as fix the second end 52 of the detachable part 5. The screw, as a standard fastener 3, has a simple structure, low cost, and is easy to assemble and disassemble. The way the screw head presses against the second end 52 allows the fixing of the detachable part 5 and the locking of the housing assembly to share the same operation, simplifying the assembly process and improving assembly and disassembly efficiency. At the same time, the screw's threaded connection has self-locking capability, making it less prone to loosening under vibration, ensuring the reliability of the connection of the first engagement area 11 and the fixing of the detachable part 5.

[0034] As an optional embodiment of the present invention, the second part 2 is provided with a C-shaped notch at the position of the first joint area 11 and the second joint area 12. During assembly, it is convenient for the end of the fixing part 4 to extend to the side of the second part 2 away from the first part 1, which is beneficial for the assembly of the first end 51 to the stop surface 41.

[0035] As an optional embodiment of the present invention, the inner wall of the first part 1 is provided with an actuation mounting area 16 and a circuit mounting area 17; the first engagement area 11 is located in the circuit mounting area 17 and is provided on the first part 1 on the side away from the actuation mounting area 16; the second engagement area 12 is located in the circuit mounting area 17 and is provided on the first part 1 on the side close to the actuation mounting area 16. See Figure 1 and Figure 2 The first joint area 11 is located in the line mounting area 17. The fastener 3, i.e. the screw embedded part, can avoid the piezoelectric actuator 6, so as to avoid interference or increase the thickness of the housing assembly. The second joint area 12 is close to the actuator mounting area 16, which can improve the connection strength of the housing assembly near the piezoelectric actuator 6.

[0036] As an optional embodiment of the present invention, the first end 51 of the detachable part 5 has at least two parts, and the first part 1 is provided with a corresponding fixing part 4, and each fixing part 4 is provided with a stop surface 41; by increasing the number of first ends 51 and stop surfaces 41, the number of engagement areas is increased, thereby increasing the stability of the housing assembly. One installation method is listed below; see [link / reference]. Figure 6 In this embodiment, the fixing part 4 is configured as an L-shaped structure, and there is a notch 42 between the first part 1. The first end 51 is flat and can be inserted into the notch 42. By rotating the detachable part 5, each first end 51 is screwed into the notch 42, so that the first end 51 forms an abutment with the stop surface 41.

[0037] As an optional embodiment of the present invention, the fixing part 4 is one of a pin, a shaft, and a wedge-shaped female buckle, and the first end 51 is one of a mating sleeve that can be assembled with a pin, a bushing that can be assembled with a shaft, and a wedge-shaped male buckle that can be assembled with a wedge-shaped female buckle. The specific assembly is as follows: See Figure 7 The fixing part 4 is a pin, and the first end 51 is a fitting sleeve. The pin is fixed on the side of the first part 1 near the second part, and its extension direction is perpendicular to the first direction. During assembly, the fitting sleeve is sleeved on the pin along the axial direction of the pin. The two cooperate to form a limit in the first direction. The stop surface 41 is the contact surface between the outer peripheral surface of the pin and the inner hole of the fitting sleeve.

[0038] See Figure 8 The fixed part 4 is a shaft, and the first end 51 is a bushing. The shaft is fixed to the side wall of the first part 1 near the second part 2, and its axial extension direction is perpendicular to the first direction. During assembly, the bushing is sleeved on the shaft along the shaft's axial direction, forming a limit in the first direction, and the stop surface 41 is the mating surface between the shaft and the bushing. See Figure 9 The fixing part 4 is a wedge-shaped female buckle, and the first end 51 is a wedge-shaped male buckle. The wedge-shaped female buckle is fixed on the side of the first part 1 near the second part 2, and its stop surface 41 is perpendicular to the first direction. As another embodiment, see Figure 9 The oblique stop surface 41-1, shown by the dashed line, is inclined relative to the first direction. During assembly, the stop of the wedge-shaped male buckle is inserted into the stop groove of the wedge-shaped female buckle, and the end face of the stop abuts against the stop surface 41 (or 41-1), forming a limit in the first direction; During assembly, the stop of the wedge-shaped male buckle is inserted into the stop groove of the wedge-shaped female buckle, and the end face of the stop abuts against the stop surface 41, forming a limit in the first direction (in this embodiment, the stop surface 41 can be set to an inclined state, see...). Figure 9 The dotted line represents one possible tilted configuration, designed to constrain the first end 51 perpendicular to the first direction, thus limiting the first end 51 from moving towards... Figure 9 (Move to the right of center) The principle is that the first end 51 of the fixed part 4 and the detachable part 5 is designed as a separable shaft hole fit or wedge-shaped fastening structure. By sleeve or fastening in a direction perpendicular to the first direction, the stop surface 41 and the first end 51 form a blocking limit in the first direction perpendicular to the assembly and disassembly direction. The beneficial effects of this structure are: the assembly direction of the pin / shaft sleeve or wedge-shaped fastening is perpendicular to the first direction, making the hooking action of the limiting unit more flexible and adaptable to working conditions where the lateral space of the housing assembly is limited; at the same time, the sleeve or fastening structure is not easy to detach on its own when subjected to vibration and impact, the fit is reliable, and the structure is simple and easy to process and form.

[0039] As an optional embodiment of the present invention, the detachable part 5 may be either plate-shaped or rod-shaped; Specifically as follows: See Figure 10 Plate-like structure: The cross-section is rectangular, with the width much greater than the thickness, and the thickness direction is along the first direction. This structure is flat, has moderate bending stiffness, and is easy to embed into the groove 21 or the clearance groove 15.

[0040] See Figure 11 Rod-like structure: The cross-section is circular or regular polygonal, and the length is much greater than the diameter or side length of the cross-section. This structure exhibits excellent torsional and tensile strength and is easy to install across complex surfaces.

[0041] Different cross-sectional properties are selected based on load-bearing requirements: plate-shaped sections emphasize bending elasticity in a flat space; rod-shaped sections emphasize torsional and tensile elasticity.

[0042] As an optional embodiment of the present invention, the stop surface 41 is one of wavy, sawtooth or stepped, and the first end 51 is provided with a mating surface that matches the shape of the stop surface 41.

[0043] Specifically: See Figure 12 When the stop surface 41 is wavy, its surface has a continuous arc-shaped concave-convex structure; the mating surface of the first end 51 is correspondingly wavy, and the two form multi-point contact when they abut. During assembly, the first end 51 is pressed against the stop surface 41 along the first direction, and under the action of pre-tightening force, the crests and troughs of the mating surface interlock with each other.

[0044] See Figure 13 When the stop surface 41 is serrated, its surface has a continuous sharp tooth structure, and the extension direction of the teeth is perpendicular to the first direction; the mating surface of the first end 51 is provided with corresponding serrations, and the two can prevent the first end 51 from sliding in a direction perpendicular to the first direction after they mesh.

[0045] See Figure 14 When the stop surface 41 is stepped, its surface forms at least one step, and the step surface is perpendicular to the first direction; the mating surface of the first end 51 is provided with a corresponding step, and the two form a stepped overlap, which can provide multiple levels of limiting positions to adapt to different assembly tolerances.

[0046] The principle is to change the mating surface between the stop surface 41 and the first end 51 from planar contact to irregularly shaped interlocking contact. By increasing the contact area or forming an interlocking structure, the anti-slip capability of the limiting component under vibration or impact conditions is improved. The advantages of this optional solution are: the irregularly shaped surface mating can effectively improve the limiting reliability of the second mating area 12 without increasing the number of fasteners; at the same time, the wavy or sawtooth interlocking structure can provide clearer tactile feedback during assembly, making it easier to judge whether the first end 51 has been assembled in place; in addition, the stepped structure can flexibly adjust the preload of the limiting component by selecting different step positions, enhancing the assembly adaptability of the housing component.

[0047] It should be noted that when a stepped shape is selected, the second end 52 needs to be adjusted accordingly. A strip groove extending along the length direction is provided, and the fastener 3 needs to slide relative to the step within this strip groove to adjust the contact position of the step, causing the detachable part 5 to be positioned towards the second end 52, i.e., from Figure 14 The solid line portion is switched to dashed line mode.

[0048] This embodiment also provides a piezoelectric screw, including: a housing assembly and a piezoelectric actuation mechanism 6; The piezoelectric actuator 6 is housed within the housing assembly; The first part 1 has an actuation mounting area 16 whose contour is adapted to the outer contour of the piezoelectric actuator 6, and the actuating end of the piezoelectric actuator 6 extends to the outside of the housing assembly. When assembling the piezoelectric actuator 6, the axis of the piezoelectric actuator 6 is parallel to the first direction, and the actuating end of the piezoelectric actuator 6 is away from the first part 1 and embedded in the inner wall contour of the first part 1 along its own axial direction. The pre-drilled hole on the second part 2 is fitted onto the actuating part. When the second part 2 is in contact with the first part 1, the first end of the detachable part 5 abuts against the stop surface 41 along the first direction to prevent the first part 1 and the second part 2 from separating from each other in the second joint area 12. Subsequently, the fastener 3 is switched to the tightened state by external operation to prevent the first part 1 and the second part 2 from separating from each other in the first joint area 11. At the same time, the first end 51 is locked with the fixing part 4. When disassembling, it is only necessary to operate the fastener 3 to switch it to the release state, which can simultaneously release the direct fastening of the first part 1 and the second part 2 in the first joint area 11 and the indirect limiting of the first part 1 and the second part 2 in the second joint area 12. This simplifies the disassembly and assembly of multiple joint areas into a single operation, significantly simplifying the disassembly and assembly process and improving the convenience of maintenance and component replacement.

Claims

1. A housing assembly, characterized by, include: A first part (1) and a second part (2) joined along a first direction, wherein at least a first joining area (11) and a second joining area (12) are provided between the first part (1) and the second part (2); Fastener (3) for connecting the first part (1) and the second part (2) at the first engagement area (11); The fastener (3) is configured to switch between a fastened state that prevents the first part (1) and the second part (2) from separating in the first engagement area (11) and a released state that releases the fastened state in response to an external operation. The limiting unit includes: The fixing part (4) is fixed to one of the first part (1) and the second part (2) in the second joint area (12); the fixing part (4) is provided with a stop surface (41); The detachable part (5) includes: a first end (51) and a second end (52); the second end (52) is fixed to the other of the first part (1) and the second part (2) in the first engagement area (11) by a fastener (3) in the fastened state; the first end (51) abuts against the stop surface (41) in the second engagement area (12) along the first direction; The detachable part (5) is configured to disengage the first end (51) from the fixed part (4) when the fastener (3) switches to the release state in response to an external operation.

2. The housing assembly according to claim 1, characterized in that, At least a portion of the detachable part (5) is made of an elastic material; The detachable part (5) is configured as follows: In response to the second end (52) being secured by the fastener (3) in a fastened state, and the first end (51) abutting against the stop surface (41), the detachable part (5) undergoes elastic deformation so that the limiting unit applies a preload force to the first part (1) and the second part (2) in the second engagement area (12) to prevent them from separating from each other.

3. The housing assembly according to claim 2, characterized in that, The fixing part (4) is disposed on the first part (1); In the first direction, the detachable part (5) is fixed to the side of the second part (2) away from the first part (1) by the fastener (3) in the fastened state, and the side of the first end (51) of the detachable part (5) away from the first part (1) abuts against the stop surface (41).

4. The housing assembly of claim 3, wherein, The first part (1) includes a shell-like portion having an opening (14) at at least one end in the first direction, and the second part (2) includes a cover plate (22) that engages with the opening (14).

5. The housing assembly of claim 4, wherein, The fixing part (4) is integrally formed with the first part (1) at the edge of the opening (14).

6. The housing assembly of claim 4, wherein, The cover plate (22) of the second part (2) is at least partially embedded in the opening (14) of the first part (1) and is interference-fitted thereto.

7. The housing assembly of claim 4, wherein, The second part (2) has a groove (21) on the side away from the first part (1) for receiving the detachable part (5).

8. The housing assembly of claim 7, wherein, The second part (2) has a clearance groove (15) on the side away from the first part (1) located in the first engagement area (11) and the second engagement area (12) for providing clearance space for the detachable part (5).

9. The housing assembly of claim 1, wherein, The fastener (3) includes a screw that passes through the second part (2) from the side of the second part (2) away from the first part (1) along the first direction and is connected to a threaded hole (13) provided in the first part (1). The second end (52) of the removable part (5) is pressed between the screw and the second part (2).

10. A piezoelectric screw, characterized in that, include: The housing assembly as described in any one of claims 1-9; as well as A piezoelectric actuation mechanism (6) is disposed within the housing assembly; The first part (1) has an actuation mounting area (16) whose contour is adapted to the outer contour of the piezoelectric actuation mechanism (6). The actuating end of the piezoelectric actuation mechanism (6) extends along the first direction and passes through the reserved hole in the housing assembly.

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