Heavy truck door limiting structure

Abstract

The utility model relates to a heavy truck door limiting structure, heavy truck door limiting structure includes support, casing, pull rod and anti follow rotation structure, the anti follow rotation structure still includes bolt and self locking nut, one end of pull rod is equipped with pull rod opening, and pull rod opening is fixedly connected with support through bolt and self locking nut, and the middle of casing is equipped with the opening, makes casing can wear the sleeve on the outer periphery of pull rod, and moves relative to pull rod, the pull rod is arc, and is equipped with multiple pull rod grooves on pull rod, and the pull rod groove realizes different angle limit through with the sliding fit of casing, the end of pull rod away from support is equipped with the limiting structure, when casing does relative motion along the axial direction of pull rod, the limiting structure carries out the displacement of casing and terminates the limit. The utility model realizes the stable limiting function of zero rotation, zero slack through rigid constraint and self locking mechanism.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts technology, specifically relating to a door limiting structure for heavy-duty truck models. Background Technology

[0002] With the advancement of technology, cars have become increasingly common, serving as a primary means of transportation. Car door limiters are one of the important components of a vehicle. Current limiter technology features a simple structure and function; the bracket and pin lack anti-rotation functionality. During prolonged door opening and closing, the connecting nut may loosen, potentially causing abnormal noises and shaking. Figure 1 As shown. Therefore, this invention provides an anti-rotation structure between the limiter bracket and the pin to solve the above-mentioned problems and effectively prevent abnormal noise and shaking caused by ordinary limiters without an anti-rotation structure. Utility Model Content

[0003] In view of the problems of abnormal noise and shaking caused by rotation and loosening in the current heavy truck door limiting structure, this utility model provides a heavy truck door limiting structure that can achieve a stable limiting function with zero rotation and zero loosening through rigid constraint and self-locking mechanism.

[0004] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions:

[0005] A heavy-duty truck door limiting structure includes a bracket, a housing, and a pull rod. The door limiter anti-rotation structure further includes a pin and a self-locking nut. One end of the pull rod has a pull rod opening, which is fixedly connected to the bracket via the pin and the self-locking nut. The housing has an opening in the middle, allowing the housing to fit around the pull rod and move relative to it. The pull rod is arc-shaped and has multiple pull rod grooves, which achieve different angle limiting through sliding engagement with the housing. The end of the pull rod away from the bracket has a limiting structure that stops the displacement of the housing when it moves relative to the pull rod along its axial direction.

[0006] According to one aspect of this utility model, the pull rod is a limiting pull rod, and one end of it is provided with a limiting structure. The width of the limiting structure is greater than the size of the opening, so that when the limiting structure of the heavy truck door is opened to the maximum angle, the limiting structure can form a limiting contact with the shell, thereby preventing the pull rod from continuing to move relative to the shell.

[0007] According to one aspect of the present invention, a buffer pad is also included, which is sleeved on the pull rod and located on the side of the housing near the limiting structure. The buffer pad is made of elastic material. When the limiting structure of the heavy truck door is opened to the maximum angle, the buffer pad can reduce the impact and absorb vibration energy during the contact between the limiting structure and the housing.

[0008] According to one aspect of the present invention, the housing further includes mounting holes symmetrically provided on both sides of the housing for accommodating a sliding structure; the sliding structure is slidably embedded in the mounting holes and achieves angular limiting through sliding engagement with the pull rod groove.

[0009] According to one aspect of this utility model, the sliding structure further includes a slider, a spring, and a baffle.

[0010] According to one aspect of the present invention, the slider is slidably placed in the mounting hole and abuts against the pull rod, thereby limiting the housing at different angles through sliding cooperation with the groove of the pull rod.

[0011] According to one aspect of this utility model, a pre-compressed spring is disposed between the baffle and the slider, and an axial force is generated through continuous elastic deformation to keep the slider pressed against the pull rod.

[0012] According to one aspect of the present invention, a baffle is fixed to the inner end face of the housing to constrain the axial displacement of the spring and prevent the slider from dislodging.

[0013] According to one aspect of the present invention, the outer periphery of the pin is provided with a boss extending axially, and the pin hole of the bracket is provided with a matching groove. The boss and the groove form a transition fit, so that the pin can only move axially relative to the bracket and cannot rotate.

[0014] According to one aspect of this utility model, it also includes bolts, and the fixing bracket is fixed to the car door by bolts.

[0015] Advantages of this utility model: The above technical solution can achieve the following effects:

[0016] 1. Effectively prevents the phenomenon of following the rotation.

[0017] A secure connection between the pull rod and the bracket: One end of the pull rod is fixedly connected to the bracket via a pin and a self-locking nut. This connection method ensures the stability and reliability of the connection between the pull rod and the bracket. During the use of the car door, it can withstand various external forces, ensuring that the pull rod will not rotate relative to the door, thereby fundamentally preventing the door limiter from rotating along with the door, and improving the stability and durability of the door limiter.

[0018] The pull rod grooves and housing provide limiting contact: The pull rod has multiple grooves that slide against the housing to achieve different angle limits. When the door is opened to different angles, the relative position of the housing and the pull rod grooves changes. By utilizing the limiting effect of the grooves, the opening angle of the door is precisely controlled, preventing the door from over-opening or under-closing due to rotation, thus improving the safety and convenience of door use.

[0019] 2. The structure is rationally designed and has multiple functions.

[0020] The protective function of the limiting structure: A limiting structure is provided at the end of the pull rod away from the bracket. When the housing moves relative to the pull rod along the axis to the maximum angle, the limiting structure stops the displacement of the housing. This design not only further prevents the door from being over-opened, avoiding collisions with the body or other components and causing damage, but also protects the internal structure of the door limiter, extending its service life.

[0021] Shock absorption and noise reduction of the buffer pad: A buffer pad made of elastic material is installed on the side of the housing near the limiting structure. When the door is opened to its maximum angle and the limiting structure contacts the housing, the buffer pad can reduce the impact force, absorb vibration energy, reduce noise generated by the collision, improve the quietness when the door is closed, and at the same time avoid impact damage to the door limiter structure, thus improving the reliability of the entire device.

[0022] Precise positioning of the sliding structure: A sliding structure, including a slider, spring, and stop plate, is slidably embedded in the mounting holes on the housing. The slider achieves positioning at different angles of the housing through its sliding engagement with the pull rod groove. A pre-compressed spring, positioned between the stop plate and the slider, generates an axial force to keep the slider pressed against the pull rod, ensuring a tight fit between the slider and the pull rod groove and improving positioning accuracy. The stop plate is fixed to the inner end face of the housing, constraining the axial displacement of the spring and preventing the slider from dislodging, ensuring the stability and reliability of the sliding structure. This sliding structure design makes the door positioning more precise and smooth, enhancing the user experience.

[0023] 3. Easy to install and maintain.

[0024] The special fit between the pin and the bracket: The pin has an axially extending boss on its outer periphery, and the bracket has a matching groove at the pin hole. The boss and groove form a transition fit, allowing the pin to move only axially relative to the bracket and preventing rotation. This design not only ensures the stability of the pin connection but also makes pin installation more convenient. Accurate positioning is achieved simply by inserting the pin into the bracket hole, without any additional complex operations. Furthermore, it facilitates disassembly and installation when maintenance or component replacement is required.

[0025] Bolt fixing method: The mounting bracket is fixed to the car door with bolts. This common fixing method is simple and easy to implement, and facilitates installation and removal. When repairing the vehicle or replacing the door limiter, the mounting bracket can be quickly removed from the door, improving repair efficiency and reducing maintenance costs.

[0026] 4. Improve overall performance and security

[0027] Overall Performance Improvement: This utility model's anti-rotation structure for heavy-duty truck door limiters achieves multiple functions, including precise control of the door opening angle, prevention of rotation, and vibration and noise reduction, through the coordinated action of various components. This effectively improves the overall performance of the door limiter, making the door more stable and reliable during use and providing users with a better experience.

[0028] Enhanced safety: Prevents excessive opening and turning of the doors, avoiding the possibility of sudden opening of the doors during driving, which could pose a safety hazard to occupants and the vehicle itself. Simultaneously, the shock-absorbing effect of the buffer pads reduces the impact on the vehicle body when the doors close, lowering vehicle vibration and noise, and improving comfort and safety during driving. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of an existing limit switch product;

[0031] Figure 2 This is a schematic diagram of the anti-rotation structure of the limiter described in this utility model;

[0032] Figure 3 This is an exploded view of a limiter anti-rotation structure according to the present invention;

[0033] Figure 4 This is a schematic diagram of a bracket according to the present invention;

[0034] Figure 5 This is a schematic diagram of a latch according to the present invention;

[0035] Figure 6 This is a schematic diagram of a self-locking nut according to the present invention;

[0036] Figure 7 This is a schematic diagram of a pull rod according to the present invention. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0040] Example 1

[0041] like Figures 2 to 7 As shown, a heavy truck door limiting structure includes a bracket 3, a housing 2, and a pull rod 1. The door limiter anti-rotation structure also includes a pin 4 and a self-locking nut 5. One end of the pull rod 1 has a pull rod opening 13, which is fixedly connected to the bracket 3 through the pin 4 and the self-locking nut 5. The housing 2 has an opening 22 in the middle, allowing the housing 2 to fit around the outer periphery of the pull rod 1 and move relative to the pull rod 1. The pull rod 1 is arc-shaped and has multiple pull rod grooves 12. The pull rod grooves 12 achieve different angle limiting through sliding cooperation with the housing 2. The end of the pull rod 1 away from the bracket 3 has a limiting structure 11. When the housing 2 moves relative to the pull rod 1 along the axial direction of the pull rod 1, the limiting structure 11 terminates and limits the displacement of the housing 2.

[0042] In this embodiment, the bracket 3 is made entirely of high-strength alloy steel. One side has a mounting plate for connection to a car door or other components, and the other side has a pin hole with a groove 31 that mates with the protrusion 41 of the pin 4. The housing 2 is a semi-cylindrical structure with an opening on one side, made of lightweight aluminum alloy. The opening 22 is located at the top of the arc of the housing 2, and its size is slightly larger than the diameter of the pull rod 1 to facilitate the insertion of the pull rod 1. The outer surface of the housing 2 is anodized to enhance its wear resistance. The pull rod 1 is made of stainless steel and its arc design can better fit the movement trajectory of the car door. The pull rod groove 12 is evenly distributed on the arc surface of the pull rod 1, with a depth of 3mm and a width of 5mm. The pin 4 is cylindrical and made of 45 steel. The transition gap between the boss 41 on its outer periphery and the groove 31 on the bracket 3 is 0.05-0.1mm. The self-locking nut 5 is a hexagonal flange self-locking nut made of stainless steel. It is threaded with the pin 4 and can effectively prevent loosening after tightening.

[0043] In this embodiment, the limiting structure 11 is a circular boss located at the end of the pull rod 1, with a diameter 8mm larger than the main body diameter of the pull rod 1. It is integrally machined from the same stainless steel material as the pull rod 1. The size of the opening 22 is slightly smaller than the diameter of the limiting structure 11. When the car door is opened to its maximum angle, the limiting structure 11 just contacts the edge of the opening 22 of the housing 2, forming a mechanical limit to prevent the pull rod 1 from continuing to move relative to the door and avoid over-opening of the car door.

[0044] In this embodiment, the buffer pad 10 is a cylindrical rubber pad with an inner diameter slightly larger than the diameter of the pull rod 1 and an outer diameter that matches the inner diameter of the housing 2 with an interference fit of 0.5-1 mm. The rubber has a Shore A hardness of 60A, providing good elasticity and cushioning performance. When the limiting structure 11 contacts the housing 2, the buffer pad 10 is compressed, absorbing impact energy through the elastic deformation of the rubber and reducing noise and vibration generated by the collision.

[0045] In this embodiment, the mounting hole 21 is an oblong hole, symmetrically distributed along the axial direction of the housing 2, and its length direction forms a certain angle with the axial direction of the pull rod 1. This angle is designed according to the actual opening angle range of the car door. The hole wall of the mounting hole 21 has been hardened to achieve a surface roughness of Ra0.8, in order to improve the smoothness and wear resistance of the slider 6.

[0046] In this embodiment, the slider 6 is rectangular in shape and made of high-strength POM plastic. Its inner side is machined with a protruding ridge that matches the groove 12 of the pull rod. The cross-sectional shape of the protruding ridge matches the groove 12 of the pull rod, and its height is 2.5mm. Guide grooves are machined on both outer sides of the slider 6, which cooperate with the guide strip on the wall of the mounting hole 21 to ensure that the slider 6 can only slide along the axial direction of the pull rod 1 within the mounting hole 21 and cannot deviate.

[0047] In this embodiment, the spring 7 is a cylindrical helical spring made of piano wire. The free length of the spring 7 is designed according to the stroke and pre-compression of the slider 6. Its stiffness coefficient is precisely calculated to ensure sufficient elastic force so that the slider 6 fits tightly against the pull rod groove 12, while also ensuring that the slider 6 slides smoothly.

[0048] In this embodiment, the baffle 8 is a circular thin plate made of stainless steel sheet, with a diameter slightly larger than the width of the mounting hole 21. It is fixed to the inner end face of the housing 2 by screws. The baffle 8 has a through hole in the center for the pull rod 1 to pass through. An annular limiting step is provided around the through hole to limit the axial displacement of the spring 7 and prevent the spring 7 from being over-compressed and coming out of the mounting hole 21.

[0049] In this embodiment, the boss 41 is 10mm long and 5mm wide, and is integrally machined with the main body of the pin 4. The dimensions of the groove 31 are precisely matched with the boss 41, and the transition fit clearance is strictly controlled between 0.05-0.1mm to ensure the correct positioning and stable connection of the pin 4 on the bracket 3, and to prevent the connection from loosening due to the rotation of the pin 4.

[0050] In this embodiment, the bolt 9 is a high-strength hexagonal bolt made of 40Cr steel, which has undergone heat treatment and is coated with a zinc layer to prevent rusting. The specifications of the bolt 9 are selected based on the mounting hole size of the bracket 3 and the structural strength of the car door, providing sufficient preload to ensure that the bracket 3 is firmly fixed to the car door.

[0051] The beneficial effects of this embodiment are as follows:

[0052] 1. Structural stability is significantly improved

[0053] A secure connection between the bracket and the pin: The bracket 3 is made of high-strength alloy steel, and the groove 31 in its pin hole forms a transition fit with the boss 41 of the pin 4, with the gap strictly controlled between 0.05-0.1mm. This high-precision fit ensures that the pin 4 can only move axially relative to the bracket 3 and cannot rotate. During frequent opening and closing of the car door, it can effectively prevent the connection from loosening due to vibration or external force, ensuring the stability and reliability of the entire door limiter anti-rotation structure.

[0054] The optimal fit between the pull rod and the housing: The pull rod 1 features an arc-shaped design, which better conforms to the movement trajectory of the car door, making the door open and close more smoothly. Simultaneously, the pull rod groove 12 on the pull rod 1 slides into the housing 2 to achieve different angle limits. This fit not only ensures the accuracy of the door angle limit but also reduces wear between components, extending service life.

[0055] 2. Precise angle limit function

[0056] The function of the limiting structure: The width of the limiting structure 11 at one end of the pull rod 1 is greater than the size of the opening 22 of the housing 2. When the car door is opened to the maximum angle, the limiting structure 11 can form a limiting contact with the housing 2, preventing the pull rod 1 from continuing to move relative to the door, thereby precisely limiting the maximum opening angle of the car door, avoiding damage caused by excessive opening of the car door, and improving the safety of car door use.

[0057] Auxiliary limiting mechanism of sliding structure: The slider 6 in the sliding structure limits the housing 2 at different angles through sliding engagement with the pull rod groove 12. The spring 7 is pre-compressed between the baffle 8 and the slider 6, and the axial force generated keeps the slider 6 pressed against the pull rod 1, ensuring a tight fit between the slider 6 and the pull rod groove 12, further improving the accuracy and stability of angle limiting.

[0058] 3. Excellent cushioning and shock absorption.

[0059] The buffer pad 10 is fitted onto the pull rod 1 and located on the side of the housing 2 near the limiting structure 11. When the door is opened to its maximum angle and the limiting structure 11 contacts the housing 2, the buffer pad 10 reduces impact and absorbs vibration energy. Made of Shore A 60A rubber material, it has good elasticity and cushioning performance, effectively reducing noise and vibration generated by collisions, improving the user experience, and protecting the internal structure of the door limiter from damage due to impact.

[0060] 4. Easy installation and maintenance

[0061] The special mating design of the pin and the bracket: the boss 41 on the outer periphery of the pin 4 transitions into the groove 31 at the pin hole of the bracket 3, making the installation of the pin 4 more convenient. Simply insert the pin 4 into the pin hole of the bracket 3 for accurate positioning, without any additional complex operations. It also facilitates disassembly and installation when maintenance or replacement of parts is required.

[0062] Bolt fixing method: Bracket 3 is fixed to the car door by bolts 9. This common fixing method is simple and easy to implement, and facilitates installation and removal. When repairing the vehicle or replacing the door limiter, bracket 3 can be quickly removed from the car door, improving repair efficiency and reducing maintenance costs.

[0063] 5. Overall performance optimization

[0064] The synergistic effect of the sliding structure: The sliding structure, composed of slider 6, spring 7, and baffle 8, works together. Slider 6 is slidably placed in the mounting hole 21 and abuts against the pull rod 1, achieving angular limitation of the housing 2 through sliding engagement with the pull rod groove 12; spring 7 provides continuous elastic force, ensuring a tight fit between slider 6 and pull rod groove 12; baffle 8 constrains the axial displacement of spring 7 and prevents slider 6 from dislodging. This synergistic effect makes the entire sliding structure stable and reliable in operation, further improving the overall performance of the door limiter.

[0065] The rational selection of materials: Bracket 3 is made of high-strength alloy steel, ensuring the strength and stability of the structure; Housing 2 is made of lightweight aluminum alloy, reducing the overall weight, and undergoes anodizing treatment to enhance wear resistance and corrosion resistance; Tie rod 1 is made of stainless steel, which has good corrosion resistance and can adapt to different usage environments. The rational selection of materials for each component optimizes the performance, weight, and service life of the door limiter anti-rotation structure.

[0066] Example 2

[0067] The difference between this embodiment and Embodiment 1 is that:

[0068] Material replacement:

[0069] Pull rod 1 uses 7075 aerospace-grade aluminum alloy instead of the original 304 stainless steel, reducing its density to 2.8g / cm³. 3 (Originally 7.9g / cm) 3 The tensile strength remains at 570 MPa.

[0070] The cushioning pad 10 is now made of polyurethane elastomer (PU) material, with its Shore hardness adjusted to 75A and tensile strength ≥5MPa.

[0071] The slider 6 has been upgraded from POM material to PEEK engineering plastic (polyetheretherketone), with a glass transition temperature of 143℃.

[0072] Structural optimization:

[0073] The mounting plate of bracket 3 has been augmented with 3 M8 threaded mounting holes (originally 2 holes);

[0074] A 0.5mm thick EPDM rubber edging is added at the opening 22 of the housing 2;

[0075] The pin 4 and boss 41 adopt a double-step design, and the diameter tolerance is improved from ±0.05mm to ±0.02mm.

[0076] Enhanced functionality:

[0077] Add a temperature compensation structure (thermal expansion and contraction compensation groove);

[0078] A protective cover to prevent accidental touch is provided (not shown);

[0079] Add a displacement sensor interface (reserved).

[0080] The working principle / operation process of this embodiment is as follows:

[0081] Assembly process:

[0082] (1) Pre-install the PEEK slider 6 into the mounting hole 21 of the housing 2, and treat the mating surface with EP grease;

[0083] (2) Insert the buffer pad 10 (5mm thick) into the middle section of the pull rod 1;

[0084] (3) When assembling pin 4, apply a preload of 8 N·m using a torque wrench;

[0085] (4) Adjust the flatness of bracket 3 using a laser calibrator (requirement ≤0.1mm / m).

[0086] Work mode:

[0087] Normal mode: The slider 6 is kept in contact with the pull rod groove 12 by the pressure of the spring 7;

[0088] High-load mode: Auxiliary clamping force is provided via an emergency bolt (supplied separately);

[0089] Thermal compensation mode: When the temperature exceeds 60℃, the double-step boss 41 automatically expands the compensation gap.

[0090] Limit logic:

[0091] (1) Primary limiting: Opening 22 blocks the movement of housing 2;

[0092] (2) Secondary limiting: Limiting structure 11 contacts buffer pad 10;

[0093] (3) Ultimate protection: Overload shear pin on bracket 3 mounting plate (specification: Φ5mm40Cr).

[0094] The beneficial effects of this embodiment are as follows:

[0095] Performance improvement

[0096] Tensile strength increased by 27% (7075 aluminum alloy vs 304 stainless steel);

[0097] The coefficient of kinetic friction decreased from 0.15 to 0.08;

[0098] The operating temperature range is extended to -50℃ to +120℃.

[0099] Enhanced reliability

[0100] The double-step boss design increases the shear resistance of the pin by 50%.

[0101] After compensation for the difference in thermal expansion coefficients, the change in clearance under high-temperature conditions is <0.03mm;

[0102] PEEK sliders have a wear resistance life of up to 100,000 cycles (POM has a wear resistance life of 50,000 cycles).

[0103] Feature Expansion

[0104] A sensor interface is reserved for connection to an ADAS system;

[0105] The anti-accidental touch cover design reduces the probability of accidental operation by 90%;

[0106] Emergency mode can ensure basic functions when the master lock fails.

[0107] Advantages of this utility model: The above solution achieves the following effects:

[0108] I. Structure and Materials

[0109] Weight reduction and increased strength are achieved simultaneously:

[0110] In Example 2, 7075 aerospace-grade aluminum alloy was used instead of the original 304 stainless steel to make the pull rod, significantly reducing the density to 2.8 g / cm³. 3 The tensile strength remains at 570MPa. This reduces the overall weight of the door limiter's anti-rotation structure, lowering vehicle energy consumption. For heavy-duty trucks, this effectively reduces fuel consumption and improves fuel economy. Simultaneously, the high strength ensures the tie rod is not easily deformed or damaged when subjected to various external forces during door opening and closing, enhancing the structure's stability and reliability.

[0111] The use of high-strength alloy steel brackets and POM sliders in Example 1, and PEEK engineering plastic sliders in Example 2, all achieve a good combination of high strength, appropriate hardness, and wear resistance in different components, ensuring the stability of the structure during long-term use.

[0112] Material properties adapted to the working environment:

[0113] In Example 2, the cushioning pad is made of polyurethane elastomer (PU) material with a Shore hardness of 75A and a tensile strength ≥5MPa. It maintains good elasticity and cushioning performance under different temperature and humidity conditions. Compared with the ordinary rubber material that may be used in Example 1, it is more adaptable to harsh working environments, reduces performance degradation caused by environmental factors, and extends the service life of the component.

[0114] The selection and matching of materials for each component, such as the anodizing treatment of the bracket and the PEEK material of the slider, have improved the wear resistance and corrosion resistance of the components, ensuring that the entire structure can work stably under various working conditions.

[0115] II. Functions and Performance

[0116] Improve the accuracy of angle limit:

[0117] Both embodiments achieve angle limiting through sliding engagement between the pull rod groove and the housing, and engagement between the slider and the pull rod groove. In Embodiment 2, the coefficient of motion friction is further reduced from 0.15 to 0.08 through precision design and processing of components such as the slider and mounting holes. This makes the door angle limiting more accurate, effectively preventing the door from being over-opened or under-closed, and improving the safety and convenience of door use.

[0118] The dual or multiple limiting structure design, such as the limiting structure blocking the opening of the shell, and the limiting structure contacting the buffer pad, etc., further ensures the stable parking of the door under various conditions and prevents abnormal displacement.

[0119] Enhanced cushioning and shock absorption:

[0120] Both the buffer pads in Embodiment 1 and Embodiment 2 effectively reduce impact and absorb vibration energy when the car door is opened to its maximum angle, thus reducing noise and vibration generated by the collision. The improved buffer pad material in Embodiment 2 enhances its buffering performance, providing more stable support for the car door and body, improving the user experience, and protecting the internal structure of the door limiter from damage due to impact.

[0121] The proper arrangement of components such as springs, as in Example 2, involves accurately calculating the stiffness coefficient and pre-compression of the springs to keep the slider in a stable pressing state on the pull rod, thereby further enhancing the buffering and shock absorption effect.

[0122] Improve installation and maintenance convenience:

[0123] Both embodiments employ bolts or similar methods for fixation, such as the bolt-fixed bracket in Embodiment 1 and the increased number of mounting holes in the bracket mounting plate in Embodiment 2, making the installation and disassembly process simpler and faster. This not only improves installation efficiency and reduces labor costs but also facilitates operation during vehicle repair or door limiter replacement, shortening repair time and improving repair efficiency.

[0124] The structural design takes into account ease of disassembly. For example, some components are designed to be separable, which makes it easy to replace worn or damaged parts and reduces maintenance costs.

[0125] III. Scalability and Security

[0126] It has good functional scalability:

[0127] Example 2 includes a reserved displacement sensor interface, enabling integration with ADAS systems and making it possible to integrate the door limiter's anti-rotation structure with advanced driver assistance systems. In the future, more intelligent functions can be developed based on demand, such as automatically monitoring door status and recording door opening and closing data, thereby enhancing the product's technological content and market competitiveness.

[0128] Modular design makes the structure easy to expand and upgrade. For example, the design of the anti-accidental touch protective cover can be selected for installation according to actual use, which makes it possible for diversified applications of the product.

[0129] Multiple layers of protection enhance security:

[0130] The design, including dual or multiple limiting mechanisms and ultimate actuation protection (such as the overload shear pin in Embodiment 2), provides multi-layered safety for the vehicle door. Under various extreme conditions, it effectively prevents the door from exceeding its normal range of motion, avoiding damage to the vehicle and passengers.

[0131] Through designs such as temperature compensation structures, the door limiter can maintain stable performance even in extreme temperature environments, reducing structural deformation and functional failure caused by temperature changes, and further improving safety in use.

[0132] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model. The above description is merely a specific implementation of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A heavy truck door limiting structure, the heavy truck door limiting structure comprising a bracket (3), a housing (2), a pull rod (1), and an anti-rotation structure, characterized in that, The anti-rotation structure also includes a pin (4) and a self-locking nut (5). One end of the pull rod (1) is provided with a pull rod opening (13). The pull rod opening (13) is fixedly connected to the bracket (3) through the pin (4) and the self-locking nut (5). The middle of the housing (2) is provided with an opening (22) so that the housing (2) can be fitted onto the outer periphery of the pull rod (1) and move relative to the pull rod (1). The pull rod (1) is arc-shaped and has multiple pull rod grooves (12). The pull rod grooves (12) achieve different angle limits through sliding cooperation with the housing (2). The end of the pull rod (1) away from the bracket (3) is provided with a limiting structure (11). When the housing (2) moves relative to the axis of the pull rod (1), the limiting structure (11) terminates and limits the displacement of the housing (2).

2. The heavy truck door limiting structure according to claim 1, characterized in that, The pull rod (1) is a limiting pull rod, and a limiting structure (11) is provided at one end. The width of the limiting structure (11) is greater than the size of the opening (22), so that when the heavy truck door limiting structure is opened to the maximum angle, the limiting structure (11) can form a limiting contact with the housing (2), thereby preventing the pull rod (1) from continuing to move relative to the housing.

3. The heavy truck door limiting structure according to claim 1 or 2, characterized in that, It also includes a buffer pad (10), which is sleeved on the pull rod (1) and located on the side of the housing (2) near the limiting structure (11). The buffer pad (10) is made of elastic material. When the heavy truck door limiting structure is opened to the maximum angle, the buffer pad (10) can reduce the impact and absorb vibration energy during the contact between the limiting structure (11) and the housing (2).

4. The heavy truck door limiting structure according to claim 1, characterized in that, The housing (2) also includes mounting holes (21), which are symmetrically opened on both sides of the housing (2) to accommodate a sliding structure. The sliding structure is slidably embedded in the mounting holes (21) and achieves angle limiting through sliding cooperation with the pull rod groove (12).

5. The heavy truck door limiting structure according to claim 4, characterized in that, The sliding structure also includes a slider (6), a spring (7), and a baffle (8).

6. The heavy truck door limiting structure according to claim 5, characterized in that, The slider (6) is slidably placed in the mounting hole (21) and abuts against the pull rod (1), thereby limiting the housing (2) at different angles through sliding cooperation with the pull rod groove (12).

7. The heavy truck door limiting structure according to claim 5, characterized in that, The spring (7) is pre-compressed between the baffle (8) and the slider (6), and generates axial force through continuous elastic deformation, so that the slider (6) keeps pressing the pull rod (1).

8. The heavy truck door limiting structure according to claim 5, characterized in that, The baffle (8) is fixed to the inner end face of the housing (2) to constrain the axial displacement of the spring (7) and prevent the slider (6) from coming out.

9. The heavy truck door limiting structure according to claim 1, characterized in that, The outer periphery of the pin (4) is provided with a boss (41) extending along the axial direction, and the pin hole of the bracket (3) is provided with a matching groove (31). The boss (41) and the groove (31) form a transition fit, so that the pin (4) can only move along the axial direction relative to the bracket (3) and cannot rotate.

10. The heavy truck door limiting structure according to claim 1, characterized in that, It also includes bolts (9), the bracket (3) being fixed to the door by bolts (9).

Images