Sliding door limiting structure

Abstract

The utility model relates to the technical field of automobile door structure, more specifically, relate to a sliding door limiting structure, including limiting concave part and limiting convex part, limiting concave part and limiting convex part one of installation on the vertical roof beam of frame, the other installation is on the sliding door, limiting concave part and limiting convex part connect when the sliding door closed state, still include damping adjusting mechanism, and the damping adjusting mechanism includes adjusting unit and sliding part, and the sliding part is through adjusting unit and limiting concave part sliding connection, and the sliding part and limiting convex part abut. The utility model can effectively avoid the knocking abnormal sound problem that sliding door limiting structure area is easy to produce in the vehicle driving process.

Description

Technical Field

[0001] This utility model relates to the field of automotive door structure technology, and more specifically, to a sliding door limiting structure. Background Technology

[0002] With the increasing popularity of MPVs (Multi-Purpose Vehicles) in the passenger car market, their unique sliding door structure has become one of the core features distinguishing them from traditional sedans and SUVs (Sport Utility Vehicles). Compared to rotating doors, sliding doors open and close by moving parallel to guide rails along the side of the vehicle body. This movement method provides more space for entry and exit, but also places higher demands on the positioning reliability of the door when closed. Currently, the industry generally uses a sliding door concave-convex block mating structure as the core limiting device. Specifically, a concave positioning block is set on the inside of the door, and a convex guide block is set at the corresponding position on the door frame. The spatial positioning of the sliding door when closed is achieved through the interlocking constraint of the two.

[0003] While the aforementioned existing technical solutions offer advantages such as simple process implementation and easy assurance of initial assembly accuracy, they reveal significant technical defects during actual vehicle use. The main issue is that when the vehicle travels on bumpy roads, the sliding door's limiting structure area is prone to knocking noises. Furthermore, with increasing mileage, the impact portion of the limiting structure deforms, leading to a progressively worsening of the noise. Analysis reveals that the root cause lies in the insufficient compatibility between the dynamic characteristics of the sliding door system and the traditional limiting structure: the sliding connection between the sliding door and the vehicle body via the guide rail slider system lacks the fully rigid fixation characteristic of a rotating door hinge. During vehicle operation, it experiences multidimensional micro-displacements due to inertial loads and road surface excitation, with the displacement amplitude in the direction perpendicular to the door plane being the most significant. The existing contact surface design and material combination of the protrusion-contact structure are ill-suited to this dynamic condition. The engineering plastic layer is prone to plastic deformation under long-term alternating impact loads, leading to an asymmetric expansion of the fit clearance and the formation of stress concentration areas. The cumulative effect of this structural damage not only exacerbates the abnormal noise problem, but also reduces the positioning accuracy of the sliding door system and affects the overall vehicle sealing performance. Utility Model Content

[0004] The purpose of this invention is to overcome the defect of existing sliding doors that produce multidimensional micro-floating displacements due to inertial loads and road surface excitation during vehicle operation, and to provide a sliding door limiting structure that can effectively avoid knocking noises in the limiting structure area of ​​the sliding door during vehicle operation.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A sliding door limiting structure is provided, including a limiting recess and a limiting protrusion. One of the limiting recess and the limiting protrusion is mounted on a vehicle frame vertical beam, and the other is mounted on the sliding door. The limiting recess and the limiting protrusion are connected when the sliding door is closed. The structure also includes a damping adjustment mechanism, which includes an adjustment part and sliding members. The sliding members are disposed on both sides inside the cavity of the limiting recess and are slidably connected to the limiting recess. The sliding members abut against the limiting protrusion. The adjustment part pushes the sliding members to slide within the limiting recess.

[0007] During the operation of the above scheme, when the sliding door is closed, the limiting protrusion and limiting concave form a basic positioning engagement. Specifically, the limiting concave, installed on the frame vertical beam, forms a composite sliding pair with the adjusting part through a sliding member. When not subjected to external force, the sliding member is maintained in its initial balanced position by the adjusting part, and the sliding member forms a surface contact constraint with the limiting protrusion on one side of the sliding door. At this time, the rigid positioning function of the traditional protrusion-concave block structure is retained, ensuring the basic positioning accuracy when the door is statically closed. When the vehicle is moving and generates vibration excitation, the sliding door system generates dynamic displacement relative to the vehicle body due to mass inertia. At this point, the damping adjustment mechanism enters the active compensation phase: the limiting protrusion applies a dynamic load to the sliding member, pushing the sliding member to produce a slight displacement along the constraint direction of the adjustment part inside the limiting recess. When the limiting protrusion applies pressure to the sliding member on one side, the adjustment part on that side compresses and deforms to absorb the impact, while the adjustment part on the other side elongates and deforms to keep the sliding member in contact with the limiting protrusion. The entire adjustment process converts the impact kinetic energy into heat energy or potential energy dissipation through the deformation of the adjustment part, which can effectively buffer vibration impacts of different amplitudes. After the dynamic displacement is eliminated, the self-recovery characteristic of the adjustment part drives the sliding member to return to the initial equilibrium position. In the entire working process, the sliding member and adjustment part are introduced on the basis of retaining the traditional bump and recess structure. By keeping the sliding members on both sides in contact with the limiting protrusion, the limiting protrusion is prevented from directly colliding with the limiting recess under the action of impact load, thus avoiding abnormal noise. The adjustment part dynamically absorbs the dynamic load and road excitation during vehicle driving, preventing abnormal noise from the sliding member colliding with the limiting recess. While maintaining the positioning accuracy of the sliding door, the vibration and abnormal noise during driving are effectively reduced.

[0008] Furthermore, the sliding member includes a sliding arm and a contact plate. The contact plate abuts against the limiting protrusion. The cavity of the limiting recess is provided with slide rails on both sides. The adjustment part is disposed in the slide rails on both sides and abuts against the sliding arm. The contact plate is made of a pressure-resistant and impact-resistant material. When it contacts the limiting protrusion, it can expand the contact area and transfer the load to the sliding arm, so that the sliding arm slides in the slide rail and absorbs the kinetic energy of the impact through the adjustment part.

[0009] Furthermore, the adjusting part is a liquid medium filled in the slide, and the damping adjusting mechanism also includes a liquid infusion loop, which is disposed in the limiting recess and connects the slides on both sides; oil is a relatively high-quality adjusting part. When the sliding part is subjected to dynamic load, the liquid medium can convert kinetic energy into heat energy through the effect of molecular friction and viscous resistance, which can effectively suppress high-frequency vibration and reduce amplitude.

[0010] Furthermore, the connection node between the infusion loop and the slide is located on the side of the slide, and the end of the sliding arm away from the contact plate is provided with a reduced diameter section. Due to the limited size and structure of the limiting recess, setting the connection node on the side of the slide can increase the volume utilization rate of the limiting recess. For the liquid medium in the slide to enter the infusion loop, the effective movement space of the liquid medium is only the space between the inner wall of the slide and the outer wall of the sliding arm. The reduced diameter section of the sliding arm increases the effective flow space of the liquid medium by reducing the volume of the sliding arm, reducing the flow shear resistance of the liquid medium, improving the fluidity of the liquid medium, and making it more conducive to the liquid medium flowing back and forth between the infusion loop and the slide.

[0011] Furthermore, it also includes a first sealing element, which is installed on the side of the slide rail near the touch plate and abuts against the sliding arm; there is a reciprocating sliding motion between the sliding arm and the slide rail, and the first sealing element is provided to achieve reciprocating sealing to ensure that the liquid medium in the slide rail does not leak.

[0012] Furthermore, it also includes a second sealing element. The slide is a through hole, and the infusion loop also includes a machined perforation. The machined perforation connects the infusion loop to the outside. The second sealing element seals the slide and the machined perforation. The machined perforation and the through hole-shaped slide are unavoidable when machining the infusion loop and the slide. They do not participate in the active compensation process of the damping adjustment mechanism. However, the sealing performance of the machined perforation and the through hole will directly affect the absorption of kinetic energy by the liquid medium. Therefore, a second sealing element is set for sealing. Since the oil pressure in the infusion loop is not actually large, the second sealing ring can effectively seal the liquid medium by using an interference fit with the machined perforation and the through hole.

[0013] Furthermore, the cavity of the limiting recess is provided with gap grooves on both sides, and the touch plate is installed in the gap groove. When the sliding door is in the open state, there is a gap between the bottom surface of the touch plate and the bottom surface of the gap groove. For the sliding member to slide, the touch plate must first have a certain sliding space. Gap grooves are dug out on both sides of the recess cavity to allow the sliding member to slide.

[0014] Furthermore, the adjustment part is an elastic element, with one end connected to the end face of the sliding arm and the other end connected to the bottom surface of the slide rail. The adjustment part can also be an elastic element, which converts the kinetic energy of vibration into the elastic potential energy of the elastic element. After the dynamic displacement is eliminated, the elastic element releases the potential energy and restores its deformation, which can also effectively reduce vibration and abnormal noise during driving. When the elastic element is used as the adjustment part, there is no need to set up an infusion loop. However, the elastic elements on both sides need to be in a compressed state when the sliding door is closed in order to achieve the basic adjustment function.

[0015] Furthermore, a limiting protrusion is provided on the side of the sliding arm near the touch plate, and a limiting groove is provided on the side of the slide rail, with the limiting protrusion abutting against the limiting groove; when the adjusting part is an elastic element, although it is not necessary to set a complex infusion loop in the limiting groove, a limiting structure is required to prevent the elastic element from completely ejecting the sliding element when the sliding door is in the open state.

[0016] Furthermore, the limiting protrusion includes a protrusion and a first base plate, the first base plate being fixedly connected to the protrusion; the limiting concave part includes a concave part and a second base plate, the second base plate being fixedly connected to the concave part; the damping adjustment mechanism is installed inside the concave part; both the first base plate and the second base plate are made of metal, and both the protrusion and the concave part are made of plastic; both the limiting protrusion and the limiting concave part are manufactured using a composite molding process of metal and plastic.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. The damping adjustment mechanism includes an adjustment part and a sliding part. The sliding part is slidably connected to the limiting recess through the adjustment part, and the sliding part abuts against the limiting protrusion. The damping adjustment mechanism constructs a sliding door limiting system with adaptive characteristics, which effectively eliminates the multi-dimensional dynamic load generated during vehicle driving and reduces vibration and abnormal noise during driving.

[0019] 2. The regulating part is a liquid medium. When the sliding part is subjected to dynamic load, the liquid medium can convert kinetic energy into heat energy through the effect of molecular friction and viscous resistance, which can effectively suppress high-frequency vibration and reduce amplitude. Attached Figure Description

[0020] Figure 1 An exploded view of a sliding door limiting structure;

[0021] Figure 2 A schematic diagram of the internal structure of the limiting recess when the adjusting part of the limiting structure of a sliding door is a liquid medium;

[0022] Figure 3 A schematic diagram of a recessed block in a sliding door limiting structure;

[0023] Figure 4 This is a schematic diagram of a sliding door limiting structure with a reduced diameter sliding component.

[0024] Figure 5 A schematic diagram of the internal structure of the limiting recess when the adjusting part of the limiting structure of a sliding door is an elastic element;

[0025] Figure 6 for Figure 5 A magnified view of a portion of point A in the middle.

[0026] In the attached diagram: 100, limiting recess; 110, slide rail; 120, gap groove; 130, recessed block; 140, second base plate; 200, limiting protrusion; 210, protrusion; 220, first base plate; 300, damping adjustment mechanism; 310, adjustment part; 320, sliding part; 321, sliding arm; 322, contact plate; 323, diameter reduction part; 330, infusion loop; 331, machined perforation; 400, first seal; 500, second seal; 600, limiting protrusion; 700, limiting groove. Detailed Implementation

[0027] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0028] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0029] Example 1

[0030] This embodiment is a first embodiment of a sliding door limiting structure, such as... Figures 1 to 4As shown, the device includes a limiting recess 100 and a limiting protrusion 200. One of the limiting recess 100 and the limiting protrusion 200 is mounted on the vertical beam of the vehicle frame, and the other is mounted on the sliding door. The limiting recess 100 and the limiting protrusion 200 are connected when the sliding door is closed. The device also includes a damping adjustment mechanism 300, which includes an adjustment part 310 and a sliding member 320. The sliding member 320 is disposed on both sides inside the cavity of the limiting recess 100 and is slidably connected to the limiting recess 100. The sliding member 320 abuts against the limiting protrusion 200. The adjustment part 310 pushes the sliding member 320 to slide within the limiting recess.

[0031] Specifically, the sliding member 320 includes a sliding arm 321 and a contact plate 322. The contact plate 322 abuts against the limiting protrusion 200. The cavity of the limiting recess 100 is provided with slide rails 110 on both sides. The adjustment part 310 is disposed in the slide rails 110 on both sides and abuts against the sliding arm 321. The contact plate 322 is made of pressure-resistant and impact-resistant material. When it contacts the limiting protrusion 200, it can expand the contact area and transfer the load to the sliding arm 321, so that the sliding arm 321 slides in the slide rail 110 and absorbs the kinetic energy of the impact through the adjustment part 310.

[0032] Specifically, the cavity of the limiting recess 100 is provided with gap grooves 120 on both sides, and the touch plate 322 is installed in the gap groove 120. When the sliding door is in the open state, there is a gap between the bottom surface of the touch plate 322 and the bottom surface of the gap groove 120. The sliding member 320 can slide, so the touch plate 322 needs to have a certain sliding space. The gap grooves 120 are dug out on both sides of the cavity of the recess 130 so that the sliding member 320 can slide.

[0033] Specifically, the limiting protrusion 200 includes a protrusion 210 and a first base plate 220, which are fixedly connected. The limiting concave part 100 includes a concave part 130 and a second base plate 140, which are fixedly connected. The damping adjustment mechanism 300 is installed in the concave part 130. The first base plate 220 and the second base plate 140 are both made of metal, while the protrusion 210 and the concave part 130 are both made of plastic. The limiting protrusion 200 and the limiting concave part 100 are both made of metal and plastic composite molding process.

[0034] The working principle of the sliding door limiting structure in this embodiment is as follows:

[0035] When a vehicle vibrates while driving on the road, the sliding door system experiences dynamic displacement in the vertical direction relative to the door plane due to mass inertia. The damping adjustment mechanism 300 actively compensates for this dynamic displacement: the limiting protrusion 200 moves to one side within the cavity of the recess 130 and applies a dynamic load to the contact plate 322 on that side, pushing the sliding arm 321 to generate a slight displacement within the adjustment part 310 along the constraint direction. The adjustment part 310 on that side then compresses and deforms to absorb the impact dynamic load, while the adjustment part 310 on the other side extends, keeping the contact plate 322 in contact with the protrusion 210. When the protrusion moves to the other side within the cavity of the recess 130, the previously compressed adjustment part 310 releases pressure, gradually recovering from the compressed state to the initial state and then to the extended state, while the previously extended adjustment part 310 gradually returns to the compressed state.

[0036] The beneficial effects of this embodiment are: the adjustment part 310 converts the impact kinetic energy into heat energy or potential energy dissipation through the viscoelastic deformation of compression and elongation, which can effectively buffer the vibration impact of different amplitudes, thereby dynamically absorbing the dynamic load and road excitation during vehicle driving to avoid the collision between the sliding part 320 and the limiting recess 100 and generate abnormal noise. While maintaining the positioning accuracy of the sliding door, it effectively reduces the vibration and abnormal noise during driving.

[0037] Example 2

[0038] This embodiment is a second embodiment of a sliding door limiting structure, such as... Figures 2 to 4 As shown, the difference from Embodiment 1 is as follows:

[0039] Specifically, the regulating part 310 is filled with a liquid medium in the slide rail 110, and the liquid medium can be hydraulic oil. The damping regulating mechanism 300 also includes a liquid delivery loop 330, which is disposed in the limiting recess 100 and connects the two slide rails 110. Oil is a relatively high-quality regulating part 310. When the sliding part 320 is subjected to dynamic load, the liquid medium can convert kinetic energy into heat energy through the effect of molecular friction and viscous resistance, which can effectively suppress high-frequency vibration and reduce amplitude.

[0040] Specifically, the connection node between the infusion loop 330 and the slide 110 is located on the side of the slide 110, and the end of the sliding arm 321 away from the contact plate 322 is provided with a reduced diameter section 323. Due to the limited size and structure of the limiting recess 100, setting the connection node on the side of the slide 110 can increase the volume utilization rate of the limiting recess 100. For the liquid medium in the slide 110 to enter the infusion loop 330, the effective movement space of the liquid medium is only the space between the inner wall of the slide 110 and the outer wall of the sliding arm 321. The reduced diameter section 323 of the sliding arm 321 increases the effective flow space of the liquid medium by reducing the volume of the sliding arm 321, reducing the flow shear resistance of the liquid medium, improving the fluidity of the liquid medium, and making it more conducive to the liquid medium flowing back and forth between the infusion loop 330 and the slide 110.

[0041] Specifically, it also includes a first seal 400, which is installed on the side of the slide 110 near the touch plate 322 and abuts against the sliding arm 321; there is a reciprocating sliding motion between the sliding arm 321 and the slide 110, and the first seal 400 is set to achieve reciprocating sealing to ensure that the liquid medium in the slide 110 does not leak.

[0042] Specifically, it also includes a second seal 500, a slide 110 which is a through hole, and a perforation 331 in the infusion loop 330. The perforation 331 connects the infusion loop 330 to the outside. The second seal 500 seals the slide 110 and the perforation 331. The perforation 331 and the through hole-shaped slide 110 are unavoidably formed when processing the infusion loop 330 and the slide 110. They do not participate in the active compensation process of the damping adjustment mechanism 300. However, the sealing performance of the perforation 331 and the through hole will directly affect the absorption of kinetic energy by the liquid medium. Therefore, the second seal 500 is set to seal. Since the oil pressure in the infusion loop 330 is not actually large, the second seal ring can effectively seal the liquid medium by using an interference fit with the perforation 331 and the through hole.

[0043] The working principle of the sliding door limiting structure in this embodiment is as follows:

[0044] The damping adjustment mechanism 300 actively compensates for dynamic displacement: the limiting protrusion 200 moves to one side within the cavity of the recess 130 and applies a dynamic load to the contact plate 322 on that side, pushing the sliding arm 321 to slide inward in the slide rail 110. The space of the slide rail 110 shrinks and compresses the liquid medium. The liquid medium flows under pressure, flowing from the liquid medium filling space of the slide rail 110 through the infusion loop 330 to the slide rail 110 on the other side, and generating a pushing force on the sliding arm 321 on the other side, pushing the sliding arm 321 on the other side to slide outward in the slide rail 110, causing the contact plate 322 to move in the direction of movement of the protrusion 210, so as to maintain the contact plate 322 on that side and the protrusion 210 in contact.

[0045] The beneficial effects of this embodiment are: by using a liquid medium as the regulating part 310, the effect of friction and viscous resistance between liquid molecules converts kinetic energy into heat energy, which can effectively suppress high-frequency vibration and reduce amplitude.

[0046] Example 3

[0047] This embodiment is a first embodiment of a sliding door limiting structure, such as... Figure 5 and 6 As shown, the difference from Embodiment 1 is as follows:

[0048] Specifically, the adjustment part 310 is an elastic element, which can be a spring. One end of the adjustment part 310 is connected to the end face of the sliding arm 321, and the other end is connected to the bottom surface of the slide rail 110. The adjustment part 310 can also be an elastic element, which converts the kinetic energy of vibration into the elastic potential energy of the elastic element. After the dynamic displacement is eliminated, the elastic element releases the potential energy and restores its deformation, which can also effectively reduce vibration and abnormal noise during driving. When the elastic element is used as the adjustment part 310, there is no need to set up the infusion loop 330. However, the elastic elements on both sides need to be in a compressed state when the sliding door is closed in order to achieve the basic adjustment function.

[0049] Specifically, a limiting protrusion 600 is provided on the side of the sliding arm 321 near the touch plate 322, and a limiting groove 700 is provided on the side of the slide rail 110. The limiting protrusion 600 abuts against the limiting groove 700. When the adjusting part 310 is an elastic member, although it is not necessary to set a complex infusion loop 330 in the limiting groove 100, a limiting structure is required to prevent the elastic member from completely popping out the sliding member 320 when the sliding door is in the open state.

[0050] The working principle of the sliding door limiting structure in this embodiment is as follows:

[0051] Initially, the elastic elements are in a partially compressed state. The connection between the limiting protrusion 600 and the limiting groove 700 holds the entire sliding member 320 in place to prevent it from popping out. When the protrusion 210 is inserted into the cavity of the recess 130, the two sides of the protrusion 210 abut against the contact plate 322 and compress the elastic elements, pushing the sliding arm 321 to slide within the slide rail 110 and continue to compress the elastic elements. In this initial state, the elastic force of the elastic elements can maintain the stable contact between the contact plate 322 and the protrusion 210. When the vehicle travels on the road, vibrations are generated. When excited, the damping adjustment mechanism 300 actively compensates for the dynamic displacement of the vibration: the limiting protrusion 200 moves to one side in the cavity of the concave block 130 and applies a dynamic load to the contact plate 322 on that side, pushing the sliding arm 321 to generate a slight displacement inside along the constraint direction of the adjustment part 310. The elastic element on that side continues to be compressed, absorbing kinetic energy and converting it into potential energy storage, while the elastic potential energy of the relatively extended and released part on the other side pops the contact plate 322 away from the slide 110, so that it keeps in contact with the protrusion 210.

[0052] The beneficial effects of this embodiment are as follows: An elastic element is selected as the adjusting part 310. Through the reciprocating compression and elongation of the elastic element, the impact kinetic energy is converted into elastic potential energy, which can effectively suppress vibration and reduce amplitude. Simultaneously, the component has low manufacturing cost. In the specific content of the above-described embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0053] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A sliding door limiting structure, comprising a limiting recess (100) and a limiting protrusion (200), wherein one of the limiting recess (100) and the limiting protrusion (200) is mounted on a vehicle frame vertical beam, and the other is mounted on the sliding door, wherein the limiting recess (100) and the limiting protrusion (200) are connected when the sliding door is closed, characterized in that, It also includes a damping adjustment mechanism (300), which includes an adjustment part (310) and a sliding member (320). The sliding member (320) is disposed on both sides inside the cavity of the limiting recess (100) and is slidably connected to the limiting recess (100). The sliding member (320) abuts against the limiting protrusion (200). The adjustment part (310) pushes the sliding member (320) to slide within the limiting recess.

2. The sliding door limiting structure according to claim 1, characterized in that, The sliding member (320) includes a sliding arm (321) and a touch plate (322). The touch plate (322) abuts against the limiting protrusion (200). The cavity of the limiting recess (100) is provided with slide rails (110) on both sides. The adjustment part (310) is disposed in the slide rails (110) on both sides and abuts against the sliding arm (321).

3. The sliding door limiting structure according to claim 2, characterized in that, The adjustment part (310) is a liquid medium filled in the slide (110). The damping adjustment mechanism (300) also includes a liquid infusion loop (330), which is disposed in the limiting recess (100) and connects the slides (110) on both sides.

4. The sliding door limiting structure according to claim 3, characterized in that, The connection point between the infusion loop (330) and the slide (110) is located on the side of the slide (110), and the end of the sliding arm (321) away from the touch plate (322) is provided with a reduced diameter section (323).

5. The sliding door limiting structure according to claim 3, characterized in that, It also includes a first seal (400), which is installed on the side of the slide (110) near the touch plate (322) and abuts against the sliding arm (321).

6. The sliding door limiting structure according to claim 3, characterized in that, It also includes a second seal (500), the slide (110) is a through hole, the infusion loop (330) also includes a machined perforation (331), the machined perforation (331) connects the infusion loop (330) to the outside, and the second seal (500) closes the slide (110) and the machined perforation (331).

7. A sliding door limiting structure according to claim 2, characterized in that, The cavity of the limiting recess (100) is provided with gap grooves (120) on both sides. The touch plate (322) is installed in the gap groove (120). When the sliding door is in the open state, there is a gap between the bottom surface of the touch plate (322) and the bottom surface of the gap groove (120).

8. The sliding door limiting structure according to claim 2, characterized in that, The adjusting part (310) is an elastic element. One end of the adjusting part (310) is connected to the end face of the sliding arm (321), and the other end is connected to the bottom surface of the slide rail (110).

9. A sliding door limiting structure according to claim 8, characterized in that, The sliding arm (321) has a limiting protrusion (600) on the side near the touch plate (322), and the slide rail (110) has a limiting groove (700) on the side, with the limiting protrusion (600) abutting against the limiting groove (700).

10. A sliding door limiting structure according to any one of claims 1-9, characterized in that, The limiting protrusion (200) includes a protrusion (210) and a first base plate (220), the first base plate (220) being fixedly connected to the protrusion (210). The limiting recess (100) includes a recess (130) and a second base plate (140), the second base plate (140) being fixedly connected to the recess (130). The damping adjustment mechanism (300) is installed in the recess (130).

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