Automotive seat lock and its noise reduction assembly and processing method

Abstract

The application relates to the technical field of seat lock, and provides an automobile seat lock, a noise reduction assembly of the automobile seat lock and a processing method.The automobile seat lock comprises a lock body, a lock pin and a noise reduction assembly.The lock body is provided with a locking port; the lock pin is movably arranged in the locking port; the noise reduction assembly comprises a wedge piece arranged in the locking port, and the inner wall of the wedge piece is provided with a wedge-shaped damping surface; the wedge-shaped damping surface has an increased cross-sectional area in the locking direction along the movement direction of the lock pin; a sliding block is arranged at the end of the lock pin, and the sliding block has a first state of being close to the wedge piece and being clamped with the wedge-shaped damping surface and a second state of being far away from the wedge piece; in the process of the sliding block being converted from the second state into the first state, the sliding block is in contact with the wedge-shaped damping surface to generate gradually increasing damping force.The automobile seat lock realizes smooth attenuation of the impact speed, so that metal impact noise is eliminated from the root.

Description

Technical Field

[0001] This application relates to the field of seat lock technology, and in particular to an automotive seat lock, its noise reduction components, and its processing method. Background Technology

[0002] Car seat locks are key safety components of seat rail systems, used to lock the rails after the seat is adjusted to the correct position, withstand collision loads, and ensure occupant safety. With the increasing demands for NVH (Noise, Vibration, Harshness) performance in new energy vehicles and high-end passenger cars, the mechanical impact noise during locking and the vibration noise during driving have become increasingly concerning, significantly impacting vehicle ride comfort. Seat locks typically consist of a lock body, a locking pin, and a return spring. When locking, the locking pin extends rapidly under spring force or motor drive and strikes the inner wall of the locking slot, achieving locking through rigid contact between the metal parts. However, this direct impact method produces a sharp "click" sound, with peak sound pressure levels often exceeding 65 dB(A), particularly noticeable in quiet car interiors, reducing the vehicle's luxurious feel and quietness.

[0003] In related technologies, rubber or polyurethane buffer blocks are placed at the end of the locking port to absorb impact energy through compression deformation. However, the performance of the buffer block material is significantly affected by temperature. In low-temperature environments (such as -40℃), the rubber material hardens and becomes brittle, resulting in a significant decrease in buffering effect and even difficulty in locking. In high-temperature environments, the rubber softens and is prone to permanent deformation, affecting locking reliability. Furthermore, the buffer block only passively absorbs energy after the impact, failing to reduce the impact velocity itself. The noise reduction effect is limited and constrained by the elastic limit of the buffer block. After long-term use, the buffer block is prone to permanent compression deformation, leading to an increase in the locking gap. This not only reduces noise reduction performance but may also lead to locking failure. Existing solutions only consider locking impact noise and lack effective means to suppress the micro-impact noise between the locking pin and the guide hole caused by road surface excitation during driving. Therefore, how to reduce the locking impact velocity at the source while taking into account all-temperature adaptability, durability, and noise suppression under driving conditions is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] This application provides an automotive seat lock, its noise reduction components, and a processing method, which can improve the technical problems of existing automotive seat locks having large impact noise during locking and abnormal vibration noise under driving conditions.

[0005] In a first aspect, embodiments of this application provide a car seat lock, comprising: The lock body has a locking stop. A locking pin, movably inserted into the locking port; and Noise reduction component, the noise reduction component includes: A wedge-shaped engagement member is disposed at the locking port. The inner wall of the wedge-shaped engagement member has a wedge-shaped damping surface, and this surface has an increased cross-sectional area along the locking direction in the movement direction of the locking pin. A sliding block is disposed at the end of the locking pin. The sliding block has a first state in which it is close to the wedge and engages with the wedge-shaped damping surface, and a second state in which it is far away from the wedge. During the process of the sliding block changing from the second state to the first state, the sliding block comes into contact with the wedge-shaped damping surface and generates a gradually increasing damping force.

[0006] The technical solutions described in this application embodiment have at least the following technical effects: The car seat lock provided in this application embodiment uses a wedge-shaped damping surface with a decreasing cross-sectional area on the inner wall of the locking port and a sliding block at the end of the locking pin. This allows for a gradually increasing damping force between the sliding block and the wedge-shaped damping surface during the final locking phase, i.e., as the sliding block transitions from a second state to a first state. This gradually converts the kinetic energy of the locking pin into frictional heat energy, achieving a smooth attenuation of the pre-impact velocity and thus eliminating metal-on-metal impact noise at its source. Furthermore, this noise reduction component does not rely on elastic material for cushioning, exhibits stable performance across the entire temperature range, and boasts advantages such as long lifespan and low maintenance costs.

[0007] In some embodiments, the locking port is provided with a guide groove, the opening of the guide groove facing the locking pin in the first state, and the noise reduction component further includes: An elastic element, one end of which is connected to the bottom of the guide groove, and the other end of which is connected to the side of the wedge member away from the locking pin.

[0008] In some embodiments, the wedge includes: The wedge-shaped engagement portion, wherein the inner wall of the wedge-shaped engagement portion is provided with a wedge-shaped damping surface; and The unloading part is connected to the wedge part. The unloading part is located at the end of the wedge part away from the locking port. The inner wall surface of the unloading part is parallel to the movement direction of the locking pin. The inner wall surface of the unloading part and the inner wall surface on the same side of the wedge part form an angle, which is an obtuse angle.

[0009] In a second aspect, embodiments of this application provide a noise reduction component, applied to the car seat lock described in any one of the first aspects, the noise reduction component comprising: A wedge-shaped engagement member is disposed at a locking port. The inner wall of the wedge-shaped engagement member has a wedge-shaped damping surface, and this surface has an increased cross-sectional area along the locking direction in the movement direction of the locking pin. A sliding block is disposed at the end of the locking pin. The sliding block has a first state in which it is close to the wedge and engages with the wedge-shaped damping surface, and a second state in which it is far away from the wedge. During the process of the sliding block changing from the second state to the first state, the sliding block comes into contact with the wedge-shaped damping surface and generates a gradually increasing damping force.

[0010] Thirdly, embodiments of this application provide a method for processing a noise reduction component, used to process the noise reduction component described in the second aspect above, the method comprising: Obtain the measured deviation feature set of the locking port corresponding to the noise reduction component to be processed. The measured deviation feature set includes at least the inner diameter deviation between the actual measured value and the design nominal value of the inner diameter of the locking port, the flatness deviation of the bottom surface of the locking port guide groove, and the parallelism deviation of the locking port end face relative to the slide rail reference surface. The processing of the noise reduction component is broken down into multiple processing sub-steps, and corresponding process boundary parameters are configured for each processing sub-step. The process boundary parameters include the current wear of the mold used in each processing sub-step, the batch hardness fluctuation amplitude of the material used in the processing sub-step, and the deviation statistical characteristics accumulated by the processing sub-step in historical processing. The processing sub-step includes at least a sliding block injection molding sub-step and a wedge stamping sub-step. The compensation parameter adjustment range is determined based on the process boundary parameters; wherein, the compensation parameter adjustment range includes the selectable compensation range of the outer diameter of the sliding block and the selectable compensation range of the angle of the wedge-shaped damping surface on the inner wall of the wedge. Based on the measured deviation feature set and the compensation parameter adjustment range, the optimal compensation parameter combination is obtained; wherein, the optimal compensation parameter combination includes the compensation parameter of the outer diameter of the sliding block and the compensation parameter of the angle of the wedge-shaped damping surface on the inner wall of the wedge; Based on the optimal compensation parameter combination, the cavity size correction command of the sliding block injection mold and the forming angle correction command of the wedge stamping mold are generated to process the sliding block and the wedge. Based on the cavity size correction command, the cavity size of the sliding block injection mold is output, and based on the forming angle correction command of the wedge stamping mold, the size of the wedge stamping mold is output. The sliding block injection device processes the sliding block through the corrected sliding block injection mold, and the wedge stamping device processes the wedge through the corrected wedge stamping mold.

[0011] The technical solutions described in this application embodiment have at least the following technical effects: The noise reduction component processing method provided in this application obtains a set of measured deviation characteristics of the locking port, including the deviation between the actual measured value and the design nominal value of the locking port's inner diameter, the flatness deviation of the bottom surface of the locking port's guide groove, and the parallelism deviation of the locking port's end face relative to the slide rail reference surface. This set is used as input reference for noise reduction component processing. The processing is broken down into at least two sub-processes: sliding block injection molding and wedge stamping. For each sub-process, process boundary parameters covering mold wear, material fluctuations, and historical deviation statistics are configured to determine the compensation parameter adjustment range. Based on the measured deviation and the compensation range, the optimal compensation parameter combination is obtained. Finally, correction instructions are generated for the sliding block injection mold and the wedge stamping mold. Based on the cavity size correction instruction, the cavity size of the sliding block injection mold is output; based on the forming angle correction instruction, the size of the wedge stamping mold is output. The sliding block injection molding device processes the sliding block using the corrected sliding block injection mold, and the wedge stamping device processes the wedge using the corrected wedge stamping mold. This method enables the machining dimensions of the noise reduction components to be precisely compensated in reverse according to the actual deviation of the locking opening, effectively eliminating the assembly mismatch problem between the lock body machining error and the noise reduction components. It reduces the defects of inconsistent noise reduction effect and low finished product qualification rate caused by locking opening deviation in traditional machining, and achieves millimeter-level adaptive matching between the noise reduction components and the locking opening, further improving the noise reduction performance of the car seat lock and significantly improving the consistency of locking noise and product yield. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of a car seat lock provided in an embodiment of this application; Figure 2 A flowchart illustrating the processing method of the noise reduction component provided in this application embodiment; Figure 3 This is a schematic diagram illustrating the process of solving for the optimal compensation parameter combination in the noise reduction component processing method provided in this application embodiment; Figure 4 This is a schematic diagram illustrating the calculation and accumulation of deviation transmission coefficients in the noise reduction component processing method provided in the embodiments of this application; Figure 5 This is a schematic diagram of the structure of the noise reduction component processing system provided in the embodiments of this application; Figure 6A schematic diagram of the control device for the noise reduction component processing equipment provided in this application embodiment.

[0014] The following are the labeling elements in the figures: 100. Car seat lock; 10. Lock body; 20. Locking pin; 30. Noise reduction component; 31. Wedge engagement part; 32. Sliding block; 1001. Locking stop; 3101. Wedge-shaped damping surface; 1002. Guide groove; 33. Elastic element; 311. Wedge engagement part; 312. Unloading part. Detailed Implementation

[0015] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0017] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0018] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 application.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0020] In this application, "and / or" is merely a way of describing the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0021] It should be noted that in this application, the words "in some embodiments," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in some embodiments," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of words such as "in some embodiments," "exemplarily," and "for example" is intended to present related concepts in a specific manner, meaning that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of this application. The appearance of the above words in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0022] Car seat locks are key safety components of seat rail systems, used to lock the rails after the seat is adjusted to the correct position, withstand collision loads, and ensure occupant safety. With the increasing demands for NVH (Noise, Vibration, Harshness) performance in new energy vehicles and high-end passenger cars, the mechanical impact noise during locking and the vibration noise during driving have become increasingly concerning, significantly impacting vehicle ride comfort. Seat locks typically consist of a lock body, a locking pin, and a return spring. When locking, the locking pin extends rapidly under spring force or motor drive and strikes the inner wall of the locking slot, achieving locking through rigid contact between the metal parts. However, this direct impact method produces a sharp "click" sound, with peak sound pressure levels often exceeding 65 dB(A), particularly noticeable in quiet car interiors, reducing the vehicle's luxurious feel and quietness.

[0023] In related technologies, rubber or polyurethane buffer blocks are placed at the end of the locking port to absorb impact energy through compression deformation. However, the performance of the buffer block material is significantly affected by temperature. In low-temperature environments (such as -40℃), the rubber material hardens and becomes brittle, resulting in a significant decrease in buffering effect and even difficulty in locking. In high-temperature environments, the rubber softens and is prone to permanent deformation, affecting locking reliability. Furthermore, the buffer block only passively absorbs energy after the impact, failing to reduce the impact velocity itself. The noise reduction effect is limited and constrained by the elastic limit of the buffer block. After long-term use, the buffer block is prone to permanent compression deformation, leading to an increase in the locking gap. This not only reduces noise reduction performance but may also lead to locking failure. Existing solutions only consider locking impact noise and lack effective means to suppress the micro-impact noise between the locking pin and the guide hole caused by road surface excitation during driving. Therefore, how to reduce the locking impact velocity at the source while taking into account all-temperature adaptability, durability, and noise suppression under driving conditions is a technical problem that urgently needs to be solved by those skilled in the art.

[0024] Based on this, in order to improve the problems of large impact noise during locking and abnormal vibration noise under driving conditions in the related technology, the embodiments of this application provide the following solutions.

[0025] Please see Figure 1 This application provides a car seat lock 100, which includes a lock body 10, a locking pin 20, and a noise reduction component 30. The noise reduction component 30 includes a wedge 31 and a sliding block 32, wherein: The lock body 10 has a locking port 1001; the locking pin 20 is movably inserted through the locking port 1001.

[0026] The wedge 31 is disposed at the locking port 1001. The inner wall of the wedge 31 is provided with a wedge-shaped damping surface 3101. The wedge-shaped damping surface 3101 has an increased cross-sectional area along the locking direction in the movement direction of the locking pin 20.

[0027] The sliding block 32 is disposed at the end of the locking pin 20. The sliding block 32 has a first state in which it is close to the wedge member 31 and engages with the wedge-shaped damping surface 3101, and a second state in which it is far away from the wedge member 31. During the process of the sliding block 32 changing from the second state to the first state, the sliding block 32 contacts the wedge-shaped damping surface 3101 and generates a gradually increasing damping force.

[0028] It is understood that the decreasing cross-sectional area of ​​the wedge-shaped damping surface 3101 can be a linear inclined plane, an arc-shaped curved surface, etc., but is not limited to these. In this embodiment, the inclined plane angle is preferably 10°±0.5° and the inclined plane length is 3±0.1mm to ensure that the impact velocity can be reduced to below 0.05m / s at the commonly used electric adjustment speed (0.5m / s). The sliding block 32, as a damping actuator that directly cooperates with the wedge-shaped damping surface 3101, can be made of high wear-resistant self-lubricating engineering plastic (such as POM+glass fiber reinforced material), with moderate hardness, low coefficient of friction, and strong impact resistance. It can generate a stable damping force when in contact with the wedge-shaped damping surface 3101, reducing abnormal noise caused by friction of metal materials, and improving the service life of the component. The outer diameter of the sliding block 32 and the minimum inner diameter of the wedge-shaped damping surface 3101 form an interference fit tolerance (0.02-0.05mm).

[0029] As can be seen from the above, the car seat lock 100 provided in this application embodiment, by providing a wedge-shaped damping surface 3101 with a decreasing cross-sectional area on the inner wall of the locking port 1001, and providing a sliding block 32 at the end of the locking pin 20, causes the sliding block 32 to generate a gradually increasing damping force between the sliding block 32 and the wedge-shaped damping surface 3101 during the final locking stage of the locking pin 20, i.e., during the process of the sliding block 32 changing from the second state to the first state. This gradually converts the kinetic energy of the locking pin 20 into frictional heat energy, achieving a smooth attenuation of the velocity before the impact, thereby eliminating metal impact noise at its source. At the same time, this noise reduction component 30 does not rely on the buffer of elastic materials, has stable performance across the entire temperature range, and has the advantages of long life and low maintenance cost.

[0030] In some embodiments, please refer to Figure 1 The locking port 1001 is provided with a guide groove 1002, the opening of the guide groove 1002 faces the locking pin 20 in the first state, and the noise reduction component 30 also includes an elastic member 33, one end of the elastic member 33 is connected to the bottom of the guide groove 1002, and the other end of the elastic member 33 is connected to the side of the wedge member 31 away from the locking pin 20.

[0031] It is understandable that the width of the guide groove 1002 and the outer wall dimension of the wedge 31 are fitted with a clearance (fit tolerance 0.01-0.03mm) to ensure smooth and unobstructed movement of the wedge 31 while preventing radial movement from affecting the damping fit accuracy. The depth of the guide groove 1002 is designed according to the movement stroke of the wedge 31, with a allowance reserved for the compression of the elastic element 33. The elastic element 33 can be a stainless steel compression spring, a polyurethane elastomer, or a disc spring, etc., with one end fixed to the bottom of the guide groove 1002 and the other end connected to the side of the wedge 31 away from the locking pin 20, forming an elastic support structure. The stiffness coefficient of the elastic element 33 is matched according to the locking force and damping force requirements of the locking pin 20. The preload can be set to 5-8N. When locking, the wedge 31 can be smoothly compressed backward with the push of the sliding block 32, providing clearance for damping. When unlocking, the wedge 31 can be quickly pushed back to reset, so that the sliding block 32 separates from the wedge-shaped damping surface 3101 and returns to the initial state.

[0032] This design, combining the guide groove 1002 and the elastic element 33, optimizes the performance of the noise reduction component 30 from two dimensions: structural limiting and elastic buffering. Firstly, the guide groove 1002 provides precise linear guidance for the wedge-shaped component 31, reducing damping failure and jamming noise caused by the offset or deflection of the wedge-shaped component 31. This ensures that the sliding block 32 and the wedge-shaped damping surface 3101 are always coaxially aligned, improving the stability and consistency of damping noise reduction. Secondly, the elastic support of the elastic element 33 can absorb the impact stress of the wedge-shaped component 31 during locking, reducing the secondary noise generated by the rigid impact between the wedge-shaped component 31 and the guide groove 1002. At the same time, it quickly resets the wedge-shaped component 31 during unlocking, making the seat lock unlock smoothly and without delay, improving the operating feel.

[0033] In some embodiments, please refer to Figure 1 The wedge member 31 includes a wedge engagement portion 311 and an unloading portion 312, wherein: The inner wall of the wedge-shaped damping surface 3101 is provided; the unloading part 312 is connected to the wedge-shaped part 311 and is located at the end of the wedge-shaped part 311 away from the locking port 1001. The inner wall surface of the unloading part 312 is parallel to the movement direction of the locking pin 20. The inner wall surface of the unloading part 312 and the inner wall surface on the same side of the wedge-shaped part 311 form an angle, which is an obtuse angle.

[0034] It is understandable that as the locking pin 20 continues to feed, the sliding block 32 enters the inner cavity of the wedge part 311 of the wedge member 31 first. The wedge-shaped damping surface 3101 of the inner wall of the wedge part 311 has an increased cross-sectional area along the locking direction of the locking pin 20. This structure is the core damping feature of the locking stage. As the locking pin 20 feeds, the outer wall of the sliding block 32 gradually comes into contact with the wedge-shaped damping surface 3101. Due to the continuous reduction of the cross-sectional area, the contact pressure between the sliding block 32 and the wedge-shaped damping surface 3101 increases linearly and steadily, thereby generating a gradually increasing damping force. By reducing the cross-sectional area, progressive damping is achieved, continuously offsetting the kinetic energy of the locking pin 20 and smoothly attenuating the high-speed feed speed of the locking pin 20. When the locking pin 20 completes the damping deceleration and feeds to the locking endpoint, the sliding block 32 will continue to move forward from the wedge-shaped part 311 and finally form an abutment with the unloading part 312 to complete the final locking and positioning. At this time, the inner wall surface of the unloading part 312 is parallel to the movement direction of the locking pin 20, which can form a stable axial support for the sliding block 32, ensuring that the locking state of the locking pin 20 is stable and there is no radial movement. When the sliding block 32 enters the unloading part 312, it disengages from the wedge-shaped part 311, and the damping force drops sharply, which can prevent motor overload.

[0035] During the unlocking process of the locking pin 20, the locking pin 20 moves in the opposite direction to the locking direction, causing the sliding block 32 to move back from the unloading part 312 to the wedge part 311. At this time, the structural feature of the inner wall of the unloading part 312 being parallel to the direction of movement of the locking pin 20 allows the sliding block 32 to move back without radial compression or frictional resistance in the initial stage, quickly releasing the abutment constraint in the locking state. The obtuse angle formed by the inner walls of the unloading part 312 and the wedge part 311 on the same side again plays a smooth transition role, guiding the sliding block 32 smoothly from the unloading part 312 into the wedge part 311 without stress concentration or movement interference due to structural corners. As the sliding block 32 continues to move towards the wedge part 311, it gradually disengages from the clamping of the wedge-shaped damping surface 3101, and the damping force decreases synchronously and linearly until the sliding block 32 completely exits the wedge part 311, and the locking pin 20 completes the unlocking and returns to a free movement state. Throughout the process, the wedge-shaped part 311 provides damping, deceleration, noise reduction, and buffering during the locking phase, while the unloading part 312 provides positioning, stable support, unobstructed clearance, and smooth guidance at the initial unlocking stage. The obtuse angle ensures that the sliding block 32 transitions smoothly and without jamming or scraping between the wedge-shaped part 311 and the unloading part 312. The various technical features work together to achieve both quiet locking and stable locking, while also ensuring smooth unlocking and unobstructed movement.

[0036] With this configuration, the wedge-shaped damping surface 3101 of the wedge engagement portion 311 decreases in cross-sectional area along the locking direction, achieving progressive damping deceleration during the locking process, smoothly consuming the kinetic energy of the locking pin 20, completely eliminating abnormal noise from rigid metal impacts, and ensuring a smooth and seamless locking process, thus improving the quietness of the vehicle interior. At the final locking stage of the locking pin 20, the sliding block 32 enters the unloading portion 312 and forms abutment positioning. The inner wall of the unloading portion 312, parallel to the direction of movement of the locking pin 20, provides stable axial support, ensuring no radial movement or loosening noise in the locking state, significantly improving locking reliability. After the unloading part 312 completely disengages from the wedge part 311, the damping force drops sharply, preventing the locking pin 20 from continuously pushing and causing the drive motor to overload and stall, effectively protecting the motor and extending the life of the seat adjustment drive mechanism; the obtuse angle between the unloading part 312 and the wedge part 311 forms a smooth transition guide surface, which ensures that the sliding block 32 smoothly enters the unloading part 312 from the wedge part 311 when locking, and also ensures that when unlocking, the sliding block 32 moves back from the unloading part 312 to the wedge part 311 without structural interference, stress concentration, scraping and jamming, and the unlocking force is uniform and smooth.

[0037] This application embodiment also provides a noise reduction component 30, including a wedge 31 and a sliding block 32, wherein: A wedge-shaped member 31 is disposed at the locking port 1001. The inner wall of the wedge-shaped member 31 is provided with a wedge-shaped damping surface 3101. The wedge-shaped damping surface 3101 has an increased cross-sectional area along the locking direction in the movement direction of the locking pin 20; and The sliding block 32 is disposed at the end of the locking pin 20. The sliding block 32 has a first state in which it is close to the wedge member 31 and engages with the wedge-shaped damping surface 3101, and a second state in which it is far away from the wedge member 31. During the process of the sliding block 32 changing from the second state to the first state, the sliding block 32 contacts the wedge-shaped damping surface 3101 and generates a gradually increasing damping force.

[0038] It is understood that the noise reduction component 30 provided in this application is an independent modular pure mechanical structure, which can be directly adapted to the assembly structure of the lock body 10 and the locking pin 20 of various car seat locks 100 without modifying the core transmission and locking mechanism of the seat lock. It has strong versatility and is easy to replace. The wedge-shaped damping surface 31 is fixedly assembled inside the locking stop 1001 of the lock body 10. The wedge-shaped damping surface 3101 of its inner wall has a decreasing cross-sectional area structure along the locking direction of the locking pin 20, forming a progressive damping engagement channel. The sliding block 32 is fastened to the end of the locking pin 20 and moves linearly back and forth synchronously with the locking pin 20, forming an active damping actuator that cooperates with the wedge-shaped damping surface 31. The sliding block 32 has two stable working states: the second state is the seat unlocked state, in which the sliding block 32 and the wedge engagement member 31 are separated and do not contact each other, and the locking pin 20 can move freely back and forth without any damping resistance; the first state is the seat locked state, in which the sliding block 32 moves towards the locking port 1001 with the locking pin 20, gradually approaching and engaging with the wedge-shaped damping surface 3101 of the wedge engagement member 31, completing the locking positioning. During the critical locking stage when the sliding block 32 transitions from the second state to the first state, the outer wall of the sliding block 32 gradually fits against the wedge-shaped damping surface 3101. As the cross-sectional area of ​​the damping surface continuously decreases, the contact pressure and frictional damping force between the two increase linearly and smoothly. This progressive damping force can continuously offset the kinetic energy of the locking pin 20, smoothly attenuating the high-speed movement speed of the locking pin 20 to near zero, eliminating the rigid impact noise between the locking pin 20 and the lock body 10 from the root.

[0039] This application also provides a method for processing noise reduction components, used to process the noise reduction component 30 in the above embodiments. The noise reduction component processing method provided in this application can be applied to a noise reduction component processing equipment. At this time, the noise reduction component processing equipment is the execution subject of the noise reduction component processing method provided in this application. This application does not impose any restrictions on the specific type of noise reduction component processing equipment.

[0040] For example, noise reduction component processing equipment may include a sliding block injection molding device, a wedge stamping device, and a control device. The sliding block injection molding device, the wedge stamping device, and the control device are electrically connected. The sliding block injection molding device is used to achieve adaptive compensation processing of the sliding block's outer diameter. For example, the sliding block injection molding device may include a repairable formal injection mold, a mold cavity adjustment mechanism, and a material supply unit. The repairable formal injection mold can modify the injection cavity. For example, the repairable formal injection mold includes a cavity body, a correction and adjustment component, a positioning and guiding component, and a cooling and forming component. The cavity body is the core cavity for sliding block injection molding, and its inner wall dimensions can be precisely fine-tuned through the correction and adjustment component to adapt to the compensation requirements of the sliding block's outer diameter. The correction and adjustment component is drivenly connected to the mold cavity adjustment mechanism and can receive cavity size correction commands issued by the control device. For example, the correction and adjustment component may adopt a combination of circumferentially distributed precision fine-tuning inserts, high-precision differential screws, and a mechanical self-locking structure. The adjusting insert is embedded in the inner wall of the cavity body. It changes the effective inner diameter of the cavity through multi-point synchronous fine adjustment, ensuring that the roundness of the cavity is not affected by the adjustment. The high-precision differential screw, as a power transmission component, is connected to the output of the servo motor of the mold cavity adjustment mechanism. It converts the correction command of the control device into a micro linear displacement, which drives the fine-adjusting insert to make radial precise advance and retreat, realizing micron-level adaptive compensation of the injection cavity size. The mechanical self-locking positioning structure locks and fixes itself immediately after the cavity size is adjusted to the correct position, resisting the dimensional deviation caused by injection high pressure, molten material impact and equipment vibration, and maintaining the long-term stability of the corrected cavity size. The inner diameter of the cavity body is adjusted using a CNC micro-adjustment structure (such as a precision lead screw and micro-adjustment inserts), with an adjustment accuracy of up to 0.001mm. Positioning and guiding components are located at the inlet and outlet ends of the cavity body to ensure the flow guidance of the injection molten material and the coaxiality of the sliding block after molding. A cooling and molding component is embedded in the inner wall of the cavity body, employing a zoned temperature control structure. Based on the molding characteristics of the high-wear-resistant, self-lubricating engineering plastic (such as POM + glass fiber reinforced material) used in the sliding block, it controls the temperature in different areas of the cavity, reducing dimensional deviations caused by plastic shrinkage and deformation. Combined with a correction and adjustment component, it further improves the machining accuracy of the sliding block's outer diameter. The mold cavity adjustment mechanism can be a motor, hydraulic press, etc. The output end of the material supply unit is connected to the repairable injection mold.

[0041] The wedge stamping device is used to achieve adaptive compensation processing of the wedge-shaped damping surface angle on the inner wall of the wedge. For example, the wedge stamping device may include a repairable formal stamping die, a die angle adjustment mechanism, and a sheet metal supply unit. The repairable formal stamping die can correct the forming angle of the wedge-shaped damping surface. For example, the repairable formal stamping die includes a forming die body, an angle fine-tuning component, a reference positioning component, and a springback compensation forming component. The forming die body is the core die body for wedge stamping, and it is provided with a forming surface adapted to the wedge and unloading parts. The tilt angle of the wedge-shaped damping surface can be precisely fine-tuned by the angle fine-tuning component to meet the compensation requirements of the wedge angle. The angle fine-tuning component is connected to the die angle adjustment mechanism and can receive forming angle correction commands from the control device. For example, the angle fine-tuning component can be wedge-shaped. The design incorporates a combination of fine-tuning pads, a precision worm gear transmission structure, and an end-face self-locking structure. The wedge-shaped fine-tuning pads are fitted onto the damping surface of the forming die body at the forming station. By adjusting the translation, the actual forming angle of the wedge-shaped damping surface is changed, ensuring a smooth transition of the mold surface without abrupt changes. The precision worm gear transmission structure reduces and reverses the power of the mold angle adjustment mechanism, achieving stepless precision adjustment of small angles with an adjustment accuracy of up to 0.1°. The end-face self-locking structure mechanically locks the mold after the angle adjustment is completed, resisting the impact load of stamping and the deviation of the mold angle caused by equipment vibration, and stably maintaining the corrected forming angle. The inclination angle of the wedge-shaped damping surface of the forming die body is adjusted by a CNC fine-tuning structure to accurately offset the deviations in the flatness of the locking guide groove, the parallelism of the end face, and the angle forming error caused by the wear of the stamping die. The reference positioning component is set at the workpiece placement station of the forming die body to limit and center the metal sheet, ensuring the stamping position accuracy of the sheet and the coaxiality of the wedge-shaped part after forming. The springback compensation forming component is embedded in the forming surface of the forming die body. It presets the compensation surface according to the springback law of the metal sheet stamping, and together with the angle fine-tuning component, it offsets the angle deviation caused by the stamping springback.

[0042] To better understand the noise reduction component processing method provided in the embodiments of this application, the specific implementation process of the noise reduction component processing method provided in the embodiments of this application will be described by way of example below.

[0043] Figure 2 A schematic flowchart of a noise reduction component processing method provided in an embodiment of this application is shown. The noise reduction component processing method includes: S100, obtain the measured deviation feature set of the locking port 1001 corresponding to the noise reduction component 30 to be processed. The measured deviation feature set includes at least the inner diameter deviation between the actual measured value and the design nominal value of the inner diameter of the locking port 1001, the flatness deviation of the bottom surface of the guide groove 1002 of the locking port 1001, and the parallelism deviation of the end face of the locking port 1001 relative to the slide rail reference surface.

[0044] It is understandable that the locking port 1001, as the core mounting carrier of the noise reduction component 30, directly determines the damping fit accuracy, noise reduction effect and smoothness of movement of the sliding block 32 and the wedge 31 by its machining dimensional deviation. The actual deviation feature set of the locking port 1001 can be obtained by a high-precision coordinate measuring machine and a laser displacement sensor, providing accurate data input for subsequent adaptive machining compensation. Among them, the deviation of the inner diameter of the locking port 1001 is the difference between the actual inner diameter and the design nominal value. If the inner diameter deviation is too large, it will cause the sliding block 32 and the wedge-shaped damping surface 3101 to have an excessive gap and damping failure with abnormal noise. If the deviation is too small, it will cause jamming and excessive movement resistance. The flatness deviation of the bottom surface of the guide groove 1002 directly affects the installation flatness of the wedge 31. If the deviation exceeds the standard, it will cause the wedge 31 to wobble and the coaxiality between the damping surface and the sliding block 32 to be unbalanced, resulting in unilateral wear and uneven damping. The parallelism deviation of the end face of the locking port 1001 relative to the slide rail reference surface will change the coaxial fit relationship between the locking pin 20 and the wedge 31, causing the sliding block 32 to have eccentric contact, abnormal damping force, and increased locking noise.

[0045] S200, the processing of the noise reduction component 30 is broken down into multiple processing sub-steps, and corresponding process boundary parameters are configured for each processing sub-step; wherein, the process boundary parameters include the current wear of the mold used in each processing sub-step, the batch hardness fluctuation amplitude of the material used in the processing sub-step, and the deviation statistical characteristics accumulated in the historical processing of the processing sub-step. The processing sub-steps include at least the sliding block injection molding sub-step and the wedge stamping sub-step.

[0046] It is understandable that the current wear of the mold refers to the wear of the cavity / forming surface of the injection mold and stamping mold due to cumulative production, which will directly lead to shrinkage of the part size and angular deviation; the batch hardness fluctuation of the material refers to the hardness difference between the engineering plastic used for sliding block 32 and the metal sheet used for wedge 31, which will affect the dimensional stability, fitting accuracy and damping performance after molding; the statistical characteristics of historical processing deviations are summarized by accumulating past production data to summarize the generation rules and influence of similar processes and similar deviations. The process of configuring process boundary parameters involves obtaining the current wear amount of the mold corresponding to each sub-stage, clarifying the direct impact of mold wear on the deviation of part size and angle, and then sampling and testing the hardness of the raw materials used in the current processing to obtain the batch hardness fluctuation amplitude of the sliding block 32 engineering plastic and the wedge 31 metal sheet, defining the interference of material property fluctuation on molding stability and damping fit accuracy. Next, the deviation statistical characteristics under similar processes and working conditions are extracted from the historical processing database to summarize the deviation generation rules and actual impact amplitude. Finally, the three types of parameters—current wear amount, material hardness fluctuation amplitude, and historical deviation statistical characteristics—are bound to the processing sub-stages, and the parameters of different dimensions are normalized to form a process boundary parameter package specific to each sub-stage.

[0047] S300, the compensation parameter adjustment range is determined based on the process boundary parameters; wherein, the compensation parameter adjustment range includes the selectable compensation range of the outer diameter of the sliding block 32 and the selectable compensation range of the angle of the wedge-shaped damping surface 3101 on the inner wall of the wedge 31.

[0048] It is understandable that the compensation parameter adjustment range is a safe, effective, and process-feasible compensation range set based on the process boundary parameters. Its core function is to prevent excessive processing compensation from causing part scrap and insufficient compensation from causing deviations that cannot be offset, while ensuring that the compensated parts meet assembly and usage requirements. The selectable compensation range for the outer diameter of the sliding block 32 is mainly determined based on the inner diameter deviation of the locking port 1001, the current wear of the injection mold, and the fluctuation amplitude of the material hardness; the selectable compensation range for the angle of the wedge-shaped damping surface 3101 on the inner wall of the wedge-shaped part 31 is determined based on the flatness deviation of the guide groove 1002, the parallelism deviation of the locking port 1001, and the current wear of the stamping mold.

[0049] The specific process for determining the compensation range is as follows: For the outer diameter of the sliding block 32, combined with the current wear of the mold in its injection molding sub-stage and the batch hardness fluctuation amplitude of the material, the cavity size shrinkage caused by mold wear and the injection molding size deviation caused by material hardness fluctuation are calculated. Then, the assembly compensation requirements corresponding to the inner diameter deviation of the locking port 1001 are added. Within the dimensional forming accuracy range achievable by the injection molding process, the upper and lower limits of the outer diameter compensation are defined, forming an optional compensation range for matching damping tolerances. For the angle of the wedge-shaped damping surface 3101 on the inner wall of the wedge-shaped part 31, the... Based on the current wear and historical processing deviation statistics of the stamping die in the stamping forming sub-stage, the wedge surface angle offset caused by die wear is calculated. At the same time, the coaxiality compensation required for the flatness deviation of the guide groove 1002 of the locking port 1001 and the parallelism deviation of the end face is coupled. Within the angle adjustment limit allowed by the stamping process, the maximum and minimum values ​​of angle compensation are determined. Finally, two types of compensation parameter adjustment ranges are formed that meet the processing limit, assembly accuracy requirements and damping noise reduction requirements: the outer diameter of the sliding block 32 and the angle of the wedge-shaped damping surface 3101 on the inner wall of the wedge 31.

[0050] S400, based on the measured deviation feature set and the compensation parameter adjustment range, the optimal compensation parameter combination is obtained; among which, the optimal compensation parameter combination includes the compensation parameter of the outer diameter of the sliding block 32 and the compensation parameter of the angle of the wedge-shaped damping surface 3101 on the inner wall of the wedge 31.

[0051] It is understandable that the optimal compensation parameter combination is the combination that achieves the best deviation cancellation and noise reduction effect by comprehensively considering the measured deviation characteristics of the locking port 1001 and the adjustment range of the compensation parameters. Its core objective is to accurately cancel out the three types of machining deviations of the locking port 1001: inner diameter, flatness, and parallelism, by using the outer diameter compensation of the sliding block and the angle compensation of the wedge-shaped damping surface 3101 of the wedge-shaped damping surface 31. The outer diameter compensation of the sliding block is mainly used to cancel out the inner diameter deviation of the locking port 1001, ensuring the accurate damping fit clearance between the sliding block 32 and the wedge-shaped damping surface 31. The angle compensation of the wedge-shaped damping surface 31 is mainly used to cancel out the flatness deviation of the guide groove 1002 and the parallelism deviation of the end face of the locking port 1001, ensuring that the sliding block 32 and the wedge-shaped damping surface 3101 are coaxially aligned and the damping force is uniform.

[0052] For example, based on each deviation in the measured deviation feature set, the local deviation estimate of each processing sub-step under the candidate compensation combination of the compensation parameter adjustment range can be calculated. Then, according to the order of dependence of each processing sub-step in the production process, the local deviation estimates are passed down and accumulated to obtain the total deviation estimate under each candidate compensation combination. Finally, after traversing all candidate compensation combinations, each candidate compensation combination and its corresponding total deviation estimate are fitted into a compensation-deviation response curve. With the goal of minimizing the total deviation estimate, the optimal compensation parameter combination is selected from the compensation parameter adjustment range. Alternatively, the orthogonal experimental method can be used to select representative parameter combinations within the compensation range for simulation calculation. The parameter with the most significant impact on the total assembly deviation can be determined through range analysis, and then the optimal compensation parameter combination can be directly determined, etc., but not limited to these methods.

[0053] In one possible implementation, please refer to Figure 3 In step S400, based on the measured deviation characteristic set and the compensation parameter adjustment range, the optimal compensation parameter combination is obtained, including: S410, based on each deviation in the measured deviation feature set, calculate the estimated local deviation of each processing sub-step under the candidate compensation combination of the compensation parameter adjustment range combination; among them, the estimated local deviation of the sliding block injection molding sub-step is at least related to the inner diameter deviation, the current wear of the mold and the batch hardness fluctuation amplitude of the material, and the estimated local deviation of the wedge stamping sub-step is at least related to the flatness deviation, parallelism deviation and the current wear.

[0054] It is understandable that the local deviation estimate is the deviation value within a single processing sub-step, calculated independently under the candidate compensation combination. It is the basic unit for calculating the total deviation and can accurately reflect the processing and forming deviation of a single part. The estimated local deviation of the sliding block injection molding sub-stage is directly coupled with the inner diameter deviation of the locking port 1001, the current wear of the injection mold, and the batch hardness fluctuation of the material: the inner diameter deviation determines the clearance compensation requirement of the sliding block 32, mold wear causes shrinkage of the injection cavity size, and material hardness fluctuation affects the dimensional stability and shrinkage rate after injection molding. The accurate deviation of this sub-stage is calculated by a multi-factor weighted algorithm. The estimated local deviation of the wedge stamping sub-stage is directly related to the flatness deviation of the bottom surface of the guide groove 1002, the parallelism deviation of the end face of the locking port 1001, and the current wear of the stamping mold: the flatness deviation affects the flatness of the installation reference of the wedge 31, the parallelism deviation affects the coaxiality of the locking pin 20 and the wedge 31, and mold wear causes angular deformation of the wedge damping surface 3101. The deviation of this sub-stage is calculated by the corresponding stamping process deviation model.

[0055] The calculation process for the local deviation estimate is as follows: First, for the sliding block injection molding sub-process, the inner diameter deviation of the locking port 1001 is used as the core assembly deviation input. The dimensional shrinkage correction coefficient corresponding to the current wear of the injection mold and the molding shrinkage rate compensation coefficient corresponding to the batch hardness fluctuation amplitude of the material are substituted into the formula. Combined with the outer diameter compensation parameter of the sliding block 32 in the current candidate compensation combination, the local deviation estimate of this sub-process is calculated through a multi-factor weighted coupling formula. Then, for the wedge part stamping molding sub-process, the flatness deviation of the bottom surface of the guide groove 1002 and the parallelism deviation of the end face of the locking port 1001 are used as the coaxiality deviation input. The angular offset correction coefficient corresponding to the current wear of the stamping mold is substituted into the formula. Combined with the angular compensation parameter of the wedge damping surface 3101 of the wedge part 31 in the current candidate compensation combination, the local deviation estimate of this sub-process is calculated through a stamping process deviation fitting model. The deviation dimension normalization process is completed simultaneously during the calculation.

[0056] S420: According to the order of dependence of each processing sub-step in the production process, the estimated values ​​of each local deviation are passed down and accumulated to obtain the estimated value of the total deviation under each candidate compensation combination.

[0057] It is understandable that the processing sub-steps of the noise reduction component 30 have a fixed sequential dependency. Although the injection molding of the sliding block 32 and the stamping of the wedge-shaped part 31 can be processed simultaneously, they need to be combined and fitted during final assembly. Deviations in the previous processing step will directly transmit and affect the fitting accuracy of the next step. Therefore, according to the actual process and assembly logic, the estimated values ​​of each local deviation need to be transmitted and accumulated step by step to obtain the total estimated value of deviation under each candidate compensation combination. This step completely simulates the deviation transmission law of actual production and assembly, abandons the limitations of single-step deviation calculation, and truly restores the final fitting deviation state of the noise reduction component 30 after assembly.

[0058] For example, the estimated local deviation of the previous processing sub-step can be converted according to a preset transfer coefficient and then superimposed on the input of the next processing sub-step as the additional deviation input of that sub-step. The estimated local deviation obtained after obtaining the additional deviation input is used as the estimated total deviation under the candidate compensation combination. Alternatively, based on a unified assembly reference coordinate system, the estimated local deviations of the two sub-steps of injection molding of sliding block 32 and stamping of wedge part 31 can be converted into deviation vectors of the corresponding assembly dimensions. Then, vector synthesis and weighted accumulation can be performed according to the damping fit and coaxial positioning assembly relationship between the two. At the same time, the synthesis result can be corrected by combining the actual contact fit characteristics of wedge damping surface 3101 and sliding block 32 to directly obtain the estimated total deviation under the candidate compensation combination, and so on, but not limited to these.

[0059] In one possible implementation, please refer to Figure 4 In step S420, according to the sequential dependence of each processing sub-step in the production process, the estimated values ​​of each local deviation are passed down level by level and accumulated to obtain the estimated value of the total deviation under each candidate compensation combination, including: S421, the estimated local deviation of the previous processing sub-step is converted according to the preset transmission coefficient and then superimposed on the input of the next processing sub-step as the additional deviation input of the sub-step.

[0060] It is understandable that local deviations in the previous sub-stage during processing will not be completely and proportionally transmitted to the next sub-stage. A transmission coefficient (e.g., a value of 0.1-0.3) can be set based on process characteristics and assembly relationships to calculate the deviation, which is then added to the input of the next sub-stage as an additional deviation input. The transmission coefficient is a deviation transmission efficiency value derived from extensive production testing, realistically simulating the attenuation and transmission patterns of deviations in actual processing. For example, the local deviation in the injection molding of sliding block 32, after being converted using the transmission coefficient, is input as an additional deviation to the stamping stage of wedge part 31, reflecting the actual impact of deviations in preceding parts on the fit of subsequent parts.

[0061] S422, the local deviation estimate obtained after obtaining the additional deviation input is recalculated and used as the total deviation estimate under the candidate compensation combination.

[0062] It is understandable that after obtaining the additional deviation input after conversion from the previous stage, the local deviation estimate of the current processing sub-stage is recalculated. This value already includes the cumulative deviation of all previous stages and the deviation of the current stage itself, which is the total deviation estimate under the candidate compensation combination. The total deviation estimate is the actual comprehensive deviation after the noise reduction component 30 is finally assembled, which directly determines the damping fit effect of the sliding block 32 and the wedge 31, the magnitude of locking noise, and the smoothness of movement. The smaller the total deviation, the better the compensation effect and the higher the compatibility between the component and the locking port 1001.

[0063] This setup employs a step-by-step, cumulative total deviation calculation method to restore the deviation transmission pattern of actual processing and assembly, reducing the one-sidedness of deviation calculation in a single link. The total deviation estimate is closer to the actual assembly state, significantly improving the accuracy of selecting the optimal compensation parameter combination. This ensures that the processed noise reduction component 30 can offset the processing deviation of the locking port 1001, guaranteeing the consistency and stability of the damping noise reduction effect from the processing end.

[0064] S430: After traversing all candidate compensation combinations, fit each candidate compensation combination and its corresponding total deviation estimate into a compensation-deviation response curve, and select the optimal compensation parameter combination from the compensation parameter adjustment range with the goal of minimizing the total deviation estimate.

[0065] It is understandable that the compensation-deviation response curve can intuitively present the correspondence and trend of the compensation amount and the total deviation. The fitting process is as follows: taking the outer diameter compensation parameter of the sliding block 32 and the angle compensation parameter of the wedge-shaped damping surface 3101 of the inner wall of the wedge 31 from all candidate compensation combinations obtained through iteration as two-dimensional input variables, taking the total deviation estimate corresponding to each candidate compensation combination as the output response variable, and fitting all discrete compensation-deviation data points through the least squares method or quadratic polynomial fitting algorithm to construct a continuous response surface or two-dimensional response curve that can accurately reflect the correlation between the change of compensation parameters and the total deviation estimate, fully presenting the fluctuation range, inflection point position and optimal range of the total deviation under different compensation parameter combinations. Then, taking the minimization of the total deviation estimate as the core optimization objective, within the adjustment range of the compensation parameters of the outer diameter of the sliding block 32 and the angle of the wedge 31, the minimum point of the response curve is located, and the outer diameter compensation parameter of the sliding block 32 and the angle compensation parameter of the wedge-shaped damping surface 3101 of the inner wall of the wedge 31 corresponding to the minimum point are determined as the optimal compensation parameter combination.

[0066] This setup, by calculating the estimated local deviations related to the measured deviation of the locking port 1001, mold wear, and material hardness fluctuation depth in each stage, can accurately match the process deviation generation characteristics of the injection molding of the sliding block 32 and the stamping of the wedge 31. Then, by progressively passing and accumulating the local deviations according to the processing sequence, the estimated total deviation can be obtained. This can accurately restore the overall fit deviation state after the noise reduction component 30 is assembled. Finally, by fitting the compensation-deviation response curve and selecting the optimal combination with the goal of minimizing the total deviation, the machining deviations of the inner diameter, flatness, and parallelism of the locking port 1001 can be offset to the greatest extent, effectively ensuring the damping fit accuracy and coaxial alignment effect of the sliding block 32 and the wedge 31.

[0067] S500 generates cavity size correction instructions for sliding block injection molds and forming angle correction instructions for wedge stamping dies based on the optimal combination of compensation parameters.

[0068] It is understandable that the sliding block injection mold cavity size correction command generated based on the optimal compensation parameter combination specifically corrects the inner diameter of the annular cavity in the injection mold used to form the outer circular mating surface of the sliding block. By precisely fine-tuning the size of the radial inner hole of this cavity, the outer diameter of the sliding block 32 after injection molding is directly controlled, thereby matching and compensating for the machining errors caused by the inner diameter deviation of the locking port 1001, mold wear, and material forming shrinkage. The forming angle of the wedge stamping die specifically refers to the inclined angle formed between the wedge-shaped damping surface 3101 of the wedge 31 and the central axis of the locking pin 20 and the sliding block 32. It can also be understood as the inclination angle formed by the wedge-shaped damping surface 3101 and the axial reference plane of the wedge 31. By correcting this forming angle, the angular offset caused by mold wear, stamping springback, and the flatness and end face parallelism deviation of the guide groove 1002 of the locking port 1001 can be offset.

[0069] The control device first extracts the sliding block outer diameter compensation parameters and the wedge-shaped damping surface angle compensation parameters from the optimal compensation parameter combination. Simultaneously, it calls the system's pre-stored injection mold reference cavity inner diameter, stamping mold reference forming angle, mold adjustment mechanism transmission mapping model, and preset equipment communication protocols and standard command formats. It first calculates the target cavity inner diameter by combining the sliding block outer diameter compensation parameters with the reference cavity inner diameter. Then, based on the displacement and cavity size mapping relationship of the cavity adjustment mechanism, it converts the size difference between the current cavity inner diameter and the target cavity inner diameter into servo pulse count, differential screw feed stroke, and fine-tuning insert radial displacement, and encapsulates the adjustment according to the industrial communication protocol. The control data frames for direction, feed displacement, self-locking at position, and closed-loop displacement detection trigger signals generate cavity size correction instructions for the sliding block injection mold. Simultaneously, the target forming tilt angle is obtained by calculating the wedge angle compensation parameters and the wedge damping surface reference forming angle. Based on the mapping relationship between the mechanical rotation angle of the angle adjustment mechanism and the forming angle, the angle difference between the current forming angle and the target forming tilt angle is converted into servo adjustment motor rotation pulses, worm gear rotation angle, and wedge fine-tuning pad translation stroke. Then, according to the equipment communication specifications, control data frames containing adjustment direction, angle fine-tuning stroke, self-locking at position, and forming angle re-check trigger signals are encapsulated to generate forming angle correction instructions for the wedge stamping mold.

[0070] S600 outputs the cavity size of the sliding block injection mold based on the cavity size correction command, and outputs the size of the wedge stamping mold based on the forming angle correction command of the wedge stamping mold. The sliding block injection device processes the sliding block through the corrected sliding block injection mold, and the wedge stamping device processes the wedge through the corrected wedge stamping mold.

[0071] It is understandable that, based on the optimal combination of compensation parameters, the system automatically generates correction commands for the cavity size of the sliding block injection mold and the forming angle of the wedge stamping die. These commands are transmitted digitally directly to the control device electrically connected to the sliding block injection device and the wedge stamping device, eliminating the need for manual mold adjustment. The correction commands can precisely adjust the cavity size of the injection mold to ensure that the outer diameter of the sliding block 32 meets the compensation requirements; and precisely adjust the forming angle of the stamping die to ensure that the angle of the wedge-shaped damping surface 3101 of the wedge 31 meets the standard.

[0072] In one possible implementation, the method further includes: S10, construct a historical database of locking port deviation-noise reduction component compensation. The historical database stores the measured deviation feature set of locking port 1001 corresponding to multiple historical workpieces, the actual outer diameter compensation amount of sliding block and wedge angle compensation amount used by each historical workpiece, and the measured locking noise value after assembly.

[0073] It is understandable that constructing a historical database of locking jaw deviation and noise reduction component compensation is the core foundation for achieving iterative optimization of processing technology and reuse of experience. The database centrally stores three types of core data from multiple historical production workpieces: the set of measured deviation characteristics of the locking jaw, the actual compensation amounts for the outer diameter of the sliding block and the angle compensation amounts for the wedge assembly, and the measured locking noise values ​​after assembly, forming a complete data link from deviation input to compensation execution to effect output. The database can adopt a local storage + cloud backup mode, enabling real-time updates, rapid retrieval, and batch access. As production data continues to accumulate, a comprehensive processing experience library will gradually form, providing data support and reference for subsequent processing compensation.

[0074] S20: Before calculating the estimated local deviation of the noise reduction component 30 to be processed, retrieve the historical record with the highest similarity to the current measured deviation feature set from the historical database, and use the compensation amount in the historical record as the initial iteration value of the current candidate compensation combination.

[0075] It is understandable that before calculating the estimated local deviation of the noise reduction component 30 to be processed, the Euclidean distance algorithm is used to retrieve the historical record with the highest similarity to the current measured deviation feature set from the historical database, and the compensation amount in that record is used as the initial iteration value of the current candidate compensation combination. Similarity matching can ensure that the historical data is highly consistent with the current processing conditions, and the initial iteration value is closer to the optimal solution, which greatly reduces the number of algorithm iterations and shortens the calculation time.

[0076] This setup, by reusing experience from historical databases, transforms entirely new calculations into rapid iterations based on historical experience, significantly improving the computational efficiency of the optimal compensation parameter combination and adapting to the high-volume, fast-paced production needs of automotive seat locks. At the same time, as data accumulates, the accuracy of the initial iteration values ​​continues to improve, further optimizing the compensation effect.

[0077] In one possible implementation, the method further includes: S700: After processing the sliding block 32 and the wedge 31 according to the correction instructions and assembling them into the corresponding locking port 1001, the actual locking noise value is obtained.

[0078] It is understandable that actual locking noise values ​​can be collected in a standard silent laboratory using a professional noise testing instrument to verify the actual effect of this processing compensation. The measured noise value is a core indicator for verifying whether the compensation meets the standard and whether the noise reduction component 30 meets the design requirements, and it can truly reflect the processing accuracy and assembly compatibility.

[0079] S800 stores the actual locking noise value, the measured deviation feature set of the current locking port 1001, and the optimal compensation parameter combination used in this instance into the locking port deviation-noise reduction component compensation history database.

[0080] It is understandable that the actual locking noise value, the measured deviation characteristic set of the locking port, and the optimal compensation parameter combination of this production are simultaneously stored in the locking port deviation-noise reduction component compensation historical database to complete the data closure loop for a single batch of production. New data can continuously enrich the database's sample size, covering more deviation types and compensation scenarios, thus improving the database's comprehensiveness and timeliness.

[0081] S900 uses newly added data from the historical database of locking deviation-noise reduction component compensation to iteratively correct the correlation coefficient in the calculation formula of the local deviation estimate.

[0082] It is understandable that iterative corrections are made to the weighting coefficients, transmission coefficients, proportional coefficients, and other relevant parameters in the local deviation prediction calculation formula, allowing the deviation calculation model to continuously align with actual processing conditions. As data accumulates, the accuracy of the calculation formula continuously improves, and the error between the predicted deviation value and the actual deviation value continuously narrows, achieving self-optimization and self-upgrading of the processing compensation algorithm.

[0083] This setup creates a closed-loop iterative mechanism of processing-verification-warehousing-correction, which enables the processing compensation accuracy of the noise reduction component 30 to continuously improve with the increase of production batches, and the deviation control accuracy to be continuously improved after long-term production, so that the locking noise remains stable at an ultra-low level.

[0084] In one possible implementation, the method further includes: S30: Obtain the cumulative number of uses for both the sliding block injection mold and the wedge stamping mold.

[0085] It is understandable that the cumulative number of uses of sliding block injection molds and wedge stamping dies is a core quantitative indicator reflecting the degree of mold wear. The current wear level is positively correlated with the number of uses; the more uses, the more severe the wear on the cavity and forming surface, and the greater the machining deviation of the part. The cumulative number of uses can be manually entered, obtained from a tooling database, etc., but is not limited to these methods.

[0086] S40: When the cumulative number of uses of any mold exceeds the preset wear warning threshold, an increase in wear compensation is added to the estimated value of the local deviation of the processing sub-step corresponding to the mold; wherein, the increase in wear compensation is positively correlated with the cumulative number of uses.

[0087] It is understandable that the critical number of uses, pre-calibrated based on the material characteristics of the sliding block injection mold and the wedge stamping mold, the processing load strength, and a large amount of historical wear test data, is the core criterion for determining when the mold enters the wear decay period and the accuracy of key forming parts begins to exceed tolerances. When the cumulative number of uses of any mold exceeds this warning threshold, key parts such as the mold cavity and forming working surface will experience wear exceeding the allowable range of the process, which may lead to a significant increase in processing deviations such as shrinkage of the outer diameter of the sliding block 32 and angular displacement of the wedge damping surface 3101 of the wedge 31. The more cumulative uses of the mold and the more severe the actual wear, the larger the additional wear compensation increment value, thereby accurately offsetting the processing deviations caused by excessive mold wear in advance, stabilizing the calculation accuracy of the local deviation estimate, so that the subsequently generated optimal compensation parameter combination can adapt to the actual wear state of the mold, and continuously and stably ensuring the processing dimension and angular accuracy of the noise reduction component 30.

[0088] This configuration allows for real-time acquisition of the cumulative usage counts of the sliding block injection mold and the wedge stamping mold. When the usage count of any mold exceeds the preset wear warning threshold, a wear compensation increment positively correlated with the cumulative usage count is added to the estimated value of the local deviation in the corresponding processing sub-stage. This enables dynamic matching of the actual wear level of the mold and precise compensation for the deviations in the outer diameter of the sliding block 32 and the angle deviations in the wedge-shaped damping surface 3101 of the wedge 31 caused by mold wear. This effectively improves the accuracy of the local deviation prediction and the adaptability of subsequent compensation parameters, continuously ensuring the processing accuracy and damping stability of the noise reduction component 30.

[0089] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0090] Corresponding to the noise reduction component processing method described in the above embodiments, this application also provides a noise reduction component processing system, wherein each unit of the system can implement each step of the noise reduction component processing method. Figure 5 A structural block diagram of the noise reduction component processing system provided in the embodiments of this application is shown. For ease of explanation, only the parts related to the embodiments of this application are shown.

[0091] Reference Figure 5 The noise reduction component processing system includes: The acquisition unit is used to acquire the measured deviation feature set of the locking port corresponding to the noise reduction component to be processed. The measured deviation feature set includes at least the inner diameter deviation between the actual measured value and the design nominal value of the inner diameter of the locking port, the flatness deviation of the bottom surface of the locking port guide groove, and the parallelism deviation of the locking port end face relative to the slide rail reference surface.

[0092] The configuration unit is used to decompose the processing of the noise reduction component into multiple processing sub-steps and configure corresponding process boundary parameters for each processing sub-step. The process boundary parameters include the current wear of the mold used in each processing sub-step, the batch hardness fluctuation amplitude of the material used in the processing sub-step, and the deviation statistical characteristics accumulated in the historical processing of the processing sub-step. The processing sub-steps include at least the sliding block injection molding sub-step and the wedge stamping sub-step.

[0093] The determining unit is used to determine the adjustment range of compensation parameters based on process boundary parameters; wherein, the adjustment range of compensation parameters includes the selectable compensation range of the outer diameter of the sliding block and the selectable compensation range of the angle of the wedge-shaped damping surface on the inner wall of the wedge.

[0094] The screening unit is used to obtain the optimal combination of compensation parameters based on the measured deviation feature set and the compensation parameter adjustment range; wherein, the optimal combination of compensation parameters includes the compensation parameters of the outer diameter of the sliding block and the compensation parameters of the angle of the wedge-shaped damping surface on the inner wall of the wedge.

[0095] The generation unit is used to generate cavity size correction instructions for the sliding block injection mold and forming angle correction instructions for the wedge stamping mold based on the optimal compensation parameter combination, so as to process the sliding block and the wedge.

[0096] The execution unit is used to output the cavity size of the sliding block injection mold based on the cavity size correction command, and to output the size of the wedge stamping mold based on the forming angle correction command of the wedge stamping mold. The sliding block injection device processes the sliding block through the corrected sliding block injection mold, and the wedge stamping device processes the wedge through the corrected wedge stamping mold.

[0097] It should be noted that the information interaction and execution process between the above systems / units are based on the same concept as the method embodiments of this application. For details on their specific functions and technical effects, please refer to the method embodiments section, and they will not be repeated here.

[0098] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the system can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0099] Figure 6 This is a schematic diagram of the structure of a control device provided in an embodiment of this application. Figure 6 As shown, the control device 6 in this embodiment includes: at least one processor 60 ( Figure 6 Only one is shown in the image), at least one memory 61 ( Figure 6 (Only one is shown in the image) and a computer program 62 stored in the at least one memory 61 and executable on the at least one processor 60. When the processor 60 executes the computer program 62, it causes the control device 6 to perform the steps in any of the above-described noise reduction component processing method embodiments, or causes the control device 6 to perform the functions of each module / unit in the above-described system embodiments.

[0100] For example, the computer program 62 may be divided into one or more modules / units, which are stored in the memory 61 and executed by the processor 60 to complete this application. The one or more modules / units may be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program 62 in the control device 6.

[0101] The control device 6 can be a computing device such as a PLC or a microcontroller. The control device 6 may include, but is not limited to, a processor 60 and a memory 61. Those skilled in the art will understand that... Figure 6 This is merely an example of control device 6 and does not constitute a limitation on control device 6. It may include more or fewer components than shown, or combine certain components, or different components, such as input / output devices, network access devices, buses, etc.

[0102] The processor 60 may be a central processing unit (CPU), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), or the like.

[0103] In some embodiments, the memory 61 may be an internal storage unit of the control device 6, such as a hard disk or memory of the control device 6. In other embodiments, the memory 61 may be an external storage device of the control device 6, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc., equipped on the control device 6. Furthermore, the memory 61 may include both internal storage units and external storage devices of the control device 6. The memory 61 is used to store operating systems, applications, bootloaders, data, and other programs, such as the program code of computer programs. The memory 61 can also be used to temporarily store data that has been output or will be output.

[0104] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A car seat lock, characterized in that, include: The lock body has a locking stop. A locking pin is movably inserted into the locking opening; as well as Noise reduction component, the noise reduction component includes: A wedge-shaped engagement member is disposed at the locking port. The inner wall of the wedge-shaped engagement member has a wedge-shaped damping surface, and this surface has an increased cross-sectional area along the locking direction in the movement direction of the locking pin. A sliding block is disposed at the end of the locking pin. The sliding block has a first state in which it is close to the wedge and engages with the wedge-shaped damping surface, and a second state in which it is far away from the wedge. During the process of the sliding block changing from the second state to the first state, the sliding block comes into contact with the wedge-shaped damping surface and generates a gradually increasing damping force. The wedge includes: The wedge-shaped engagement portion, wherein the inner wall of the wedge-shaped engagement portion is provided with a wedge-shaped damping surface; and The unloading part is connected to the wedge part. The unloading part is located at the end of the wedge part away from the locking port. The inner wall surface of the unloading part is parallel to the movement direction of the locking pin. The inner wall surface of the unloading part and the inner wall surface on the same side of the wedge part form an angle, which is an obtuse angle. When the locking pin completes damping deceleration and feeds to the locking endpoint, the sliding block continues to move forward from the wedge part, eventually forming an abutment with the unloading part to complete the final locking and positioning. At this time, the inner wall surface of the unloading part is parallel to the movement direction of the locking pin, which can form a stable axial support for the sliding block, ensuring that the locking pin is in a stable locking state without radial movement. When the sliding block enters the unloading part, it disengages from the wedge part.

2. The car seat lock as described in claim 1, characterized in that, The locking port is provided with a guide groove, the opening of which faces the locking pin in the first state. The noise reduction component further includes: An elastic element, one end of which is connected to the bottom of the guide groove, and the other end of which is connected to the side of the wedge member away from the locking pin.

3. A noise reduction component, characterized in that, Applied to the automotive seat lock as described in any one of claims 1 to 2, the noise reduction component comprises: A wedge-shaped engagement member is disposed at a locking port. The inner wall of the wedge-shaped engagement member has a wedge-shaped damping surface, and this surface has an increased cross-sectional area along the locking direction in the movement direction of the locking pin. A sliding block is disposed at the end of the locking pin. The sliding block has a first state in which it is close to the wedge and engages with the wedge-shaped damping surface, and a second state in which it is far away from the wedge. During the process of the sliding block changing from the second state to the first state, the sliding block comes into contact with the wedge-shaped damping surface and generates a gradually increasing damping force.

4. A method for processing a noise reduction component, characterized in that, The method for processing the noise reduction component according to claim 3 includes: Obtain the measured deviation feature set of the locking port corresponding to the noise reduction component to be processed. The measured deviation feature set includes at least the inner diameter deviation between the actual measured value and the design nominal value of the inner diameter of the locking port, the flatness deviation of the bottom surface of the locking port guide groove, and the parallelism deviation of the locking port end face relative to the slide rail reference surface. The processing of the noise reduction component is broken down into multiple processing sub-steps, and corresponding process boundary parameters are configured for each processing sub-step. The process boundary parameters include the current wear of the mold used in each processing sub-step, the batch hardness fluctuation amplitude of the material used in the processing sub-step, and the deviation statistical characteristics accumulated by the processing sub-step in historical processing. The processing sub-step includes at least a sliding block injection molding sub-step and a wedge stamping sub-step. The compensation parameter adjustment range is determined based on the process boundary parameters; wherein, the compensation parameter adjustment range includes the selectable compensation range of the outer diameter of the sliding block and the selectable compensation range of the angle of the wedge-shaped damping surface on the inner wall of the wedge. Based on the measured deviation feature set and the compensation parameter adjustment range, the optimal compensation parameter combination is obtained; wherein, the optimal compensation parameter combination includes the compensation parameter of the outer diameter of the sliding block and the compensation parameter of the angle of the wedge-shaped damping surface on the inner wall of the wedge; Based on the optimal compensation parameter combination, generate cavity size correction instructions for the sliding block injection mold and forming angle correction instructions for the wedge stamping mold; Based on the cavity size correction command, the cavity size of the sliding block injection mold is output, and based on the forming angle correction command of the wedge stamping mold, the size of the wedge stamping mold is output. The sliding block injection device processes the sliding block through the corrected sliding block injection mold, and the wedge stamping device processes the wedge through the corrected wedge stamping mold.

5. The noise reduction component processing method as described in claim 4, characterized in that, The process of obtaining the optimal combination of compensation parameters based on the measured deviation feature set and the compensation parameter adjustment range includes: Based on each deviation in the measured deviation feature set, the estimated local deviation for each of the processing sub-steps under the candidate compensation combination of the compensation parameter adjustment range is calculated; wherein, the estimated local deviation for the sliding block injection molding sub-step is at least related to the inner diameter deviation, the current wear of the mold, and the batch hardness fluctuation amplitude of the material, and the estimated local deviation for the wedge stamping sub-step is at least related to the flatness deviation, the parallelism deviation, and the current wear; According to the order of dependence of each processing sub-step in the production process, the estimated values ​​of each local deviation are passed down and accumulated to obtain the estimated value of the total deviation under each candidate compensation combination. After traversing all the candidate compensation combinations, each candidate compensation combination and its corresponding total deviation estimate are fitted into a compensation-deviation response curve. With the goal of minimizing the total deviation estimate, the optimal compensation parameter combination is selected from the compensation parameter adjustment range.

6. The method for processing noise reduction components as described in claim 5, characterized in that, The step of passing the local deviation estimates step by step and accumulating them according to the sequential dependence of each processing sub-step in the production process to obtain the total deviation estimate under each candidate compensation combination includes: The estimated local deviation of the previous processing sub-step is converted according to the preset transmission coefficient and then added to the input of the next processing sub-step as the additional deviation input of that sub-step. The estimated local deviation, recalculated after obtaining the additional deviation input, is used as the estimated total deviation under the candidate compensation combination.

7. The noise reduction component processing method as described in claim 5, characterized in that, The method further includes: Construct a historical database for locking port deviation-noise reduction component compensation. The historical database stores the measured deviation feature set of locking ports corresponding to multiple historical workpieces, the actual outer diameter compensation amount of sliding block and the wedge angle compensation amount used for each historical workpiece, and the measured locking noise value after assembly. Before calculating the estimated local deviation of the noise reduction component to be processed, the historical record with the highest similarity to the current measured deviation feature set is retrieved from the historical database, and the compensation amount in the historical record is used as the initial iteration value of the current candidate compensation combination.

8. The method for processing noise reduction components as described in claim 7, characterized in that, The method further includes: After machining the sliding block and wedge according to the correction instructions and assembling them into the corresponding locking port, the actual locking noise value is obtained; The actual locking noise value, the measured deviation feature set of the current locking port, and the optimal compensation parameter combination used this time are stored together in the locking port deviation-noise reduction component compensation history database. Based on the newly added data in the historical database of the locking deviation-noise reduction component compensation, the correlation coefficient in the calculation formula of the local deviation estimate is iteratively corrected.

9. The method for processing noise reduction components as described in claim 7, characterized in that, The method further includes: The cumulative number of uses for the sliding block injection mold and the wedge stamping mold is obtained respectively. When the cumulative number of uses of any mold exceeds a preset wear warning threshold, a wear compensation increment is added to the estimated value of the local deviation of the processing sub-step corresponding to the mold; wherein the wear compensation increment is positively correlated with the cumulative number of uses.

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