A push rod sealing structure and a door automatic opening and closing driver

Abstract

The utility model discloses a sealing structure of a push rod and an automatic door opening and closing driver, which is used in conjunction with a push rod of a special-shaped rod structure, and the sealing structure includes an annular structure composed of a built-in support frame and an external elastic layer, the elastic layer is arranged along one end of the through cavity of the annular structure and extends outward in parallel to form a covering ring that wraps the push rod, the inner wall of the covering ring is provided with a first protruding ring arranged in an annular manner, and at least one second protruding ring arranged at intervals is respectively arranged on both sides of the first protruding ring on the inner wall of the covering ring, and an oil groove for storing grease is formed between any adjacent first protruding ring and second protruding ring or between any adjacent two second protruding rings; wherein, the first protruding ring and the second protruding ring are both interference-fitted with the push rod, and the annular center line of the first protruding ring and the center line of the push rod at the contact position between the first protruding ring and the push rod are arranged in a colinear manner. The sealing structure of the utility model enables the entire driver to reach the protection level of IP6K7.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts, in particular to a sealing structure of a push rod and an automatic opening and closing driver for a vehicle door. Background Art

[0002] With the widespread application of intelligent and electric household cars, automatic swing door systems have gradually become products that users often use and experience. As the core component for realizing automatic opening and closing of car doors, the drive actuator can be divided into two structures: inner swing type and outer swing type; among them, the inner swing type drive occupies a smaller space and has a wider range of applications.

[0003] The existing inner swing drive actuator is shown in the patent with patent application number CN202110010842.5 and the name is a car door drive mechanism; it usually includes a pull rod, a screw nut (nut slider), a main tube and a screw. One end of the pull rod is hinged to the door or the body, and the other end of the pull rod is hinged to the screw nut. The screw nut is threadedly connected to the screw and slidably arranged with the main tube. The screw is rotatably connected in the main tube and driven by the driving mechanism; the rotation of the screw drives the pull rod to move, and the movement of the pull rod rotates the door along the hinge point between the door and the body to realize the opening and closing of the door.

[0004] Among them, the pull rod in the above patent is a special-shaped rod (curved rod). In the prior art (application number CN202321789965.4), there is also a driver that sets the pull rod as a straight rod structure. Compared with the pull rod with a straight rod structure, the pull rod with a special-shaped rod structure can adapt to the angle changes during the opening and closing process of the door, so that the pull rod can be stably extended and retracted, avoiding interference with the inner wall of the gearbox, further reducing the shaking during the opening and closing process of the door, and making the opening and closing of the door more stable. It can be seen that the pull rod with a special-shaped rod structure has a better use effect.

[0005] During use, the pull rod of the special-shaped rod structure needs to be extended and retracted in the main tube, so a channel for the pull rod to be extended and retracted is provided on the main tube. In order to prevent the problem that impurities such as water and dust from the outside enter the main tube through the channel and cause the screw rod or other parts in the main tube to rust, in the above patent, a dust cover is provided on the main tube to intercept impurities from the outside to ensure the waterproof effect of the entire drive.

[0006] However, the above patent does not record the specific structure and material of the waterproof cover. Based on the function of the waterproof cover, those skilled in the art can easily think of using an elastic cover structure for the dust cover, fixing the dust cover and the main tube, and making the elastic cover and the pull rod interference fit to achieve waterproofing of the dust cover and the pull rod. However, during use, the pull rod needs to be telescopic, which means that it needs to be slidably connected with the dust cover; and the prior art cannot ensure that the dust cover and the pull rod can both be in sealing contact and slide smoothly with each other. Therefore, it is necessary to provide a sealing structure for the pull rod with a special-shaped rod structure. Utility Model Content

[0007] In view of the deficiencies in the prior art, the utility model provides a sealing structure of a push rod and an automatic door opening and closing driver, which solves the problem in the prior art that the waterproof effect of the waterproof cover matched with the pull rod of the special-shaped rod structure is not ideal.

[0008] To achieve the above purpose, the utility model adopts the following technical solution: a sealing structure of a push rod, used in conjunction with a push rod of a special-shaped rod structure, the sealing structure includes an annular structure composed of a built-in support frame and an external elastic layer, the elastic layer is arranged along one end of the through cavity of the annular structure and extends outward in parallel to form a covering ring that wraps the push rod,

[0009] The inner wall of the covering ring is provided with a first protruding ring, and at least one second protruding ring is provided on both sides of the inner wall of the covering ring. An oil groove for storing grease is formed between any adjacent first protruding ring and second protruding ring or between any adjacent two second protruding rings.

[0010] The first raised ring and the second raised ring are both interference fit with the push rod, and the annular center line of the first raised ring and the center line of the push rod at the contact position between the first raised ring and the push rod are colinearly arranged.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] The sealing structure of the utility model is composed of two layers of inner and outer materials; the support frame can be an injection molded part with sufficient hardness requirements; the elastic layer can be made of rubber material to meet the elasticity requirements; the assembly process of the support frame and the elastic layer can be a secondary injection molding method to fix the connection, or it can be fixed by an external rubber coating process.

[0013] The annular structure composed of the support frame and the elastic layer can meet both the stiffness requirements and the elasticity requirements, ensuring that the position of the covering ring of the annular structure does not change substantially with the movement of the push rod (relative to the mounting housing of the driver), ensuring that the covering ring is always wrapped around the push rod.

[0014] The first raised ring and the second raised ring in the covering ring are both interference fit with the push rod, which can effectively prevent external impurities from entering the installation housing of the driver along with the push rod; at the same time, an oil groove is provided in the covering ring, and grease is provided in the oil groove. The presence of the grease can enable the push rod to slide smoothly along the covering ring; and the annular center line of the first raised ring and the center line of the push rod at the contact position between the first raised ring and the push rod are colinearly arranged, which means that the first raised ring is not affected or basically not affected by the movement of the push rod, and can always be wrapped around the outer wall of the push rod, so that the entire driver can reach the protection level of IP6K7.

[0015] Furthermore, there are two second raised rings, the two second raised rings are respectively arranged on both sides of the first raised ring, and the inner walls of the two second raised rings are inclined relatively outward along the first raised ring.

[0016] Furthermore, the sealing structure also includes a mounting ring, which is arranged side by side with the annular structure, and the through-cavity direction of the mounting ring is parallel to the through-cavity direction of the annular structure.

[0017] Furthermore, the mounting ring includes a built-in positioning frame and an external plastic layer, the positioning frame and the supporting frame are fixed, and the plastic layer and the elastic layer are made of the same material and are integrally formed.

[0018] Furthermore, the support frame is provided with an annular plate extending vertically outward along the other end of the annular structure cavity, the elastic layer covers both sides of the annular plate, and the elastic layer covering the outside of the annular plate is provided with two annular sealing rings extending outward on both sides of the annular plate.

[0019] Furthermore, a plurality of connection grooves are evenly distributed on the outer wall of the support frame, and the elastic layer covers the plurality of connection grooves and is fitted and fixed to the support frame.

[0020] The utility model also provides an automatic door opening and closing driver, including the above-mentioned sealing structure, and also includes a mounting shell and a push rod, one end of the push rod extends out of a channel opened on the mounting shell, and the other end of the push rod is slidably arranged in the mounting shell, the annular structure is sleeved on the push rod and the other end of the annular structure is sealed and fixed to the channel.

[0021] Furthermore, the cross section of the push rod along its length direction includes any one of a circular, rectangular, and lantern shape.

[0022] Furthermore, the cross section of the push rod along its length direction is circular.

[0023] Compared with the prior art, the utility model has the following beneficial effects: through the sealing structure of the utility model, the dust and water resistance problems of the sliding part of the driver push rod and the mounting shell can be solved, so that the driver can reach the IP6K7 protection level. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the internal structure of the driver of the utility model;

[0025] Figure 2 This is a cross-sectional view of the driver of the utility model;

[0026] Figure 3 for Figure 2 Enlarged view of the middle D part;

[0027] Figure 4 It is a partial schematic diagram of another cross-sectional view of the driver of the utility model;

[0028] Figure 5 An exploded schematic diagram of some components of the driver of the utility model;

[0029] Figure 6 This is a schematic diagram of the appearance of the sealing structure of the utility model;

[0030] Figure 7 It is the envelope appearance diagram of the push rod motion of the utility model;

[0031] Figure 8 The utility model is a motion plane diagram of the push rod of the driver when it is in use and located at different positions of the mounting housing.

[0032] In the figure: push rod 1, mounting housing 2, gear box housing 20, sealing structure 3, supporting skeleton 31, connecting groove 311, annular plate 312, elastic layer 32, first annular sealing ring 321, second annular sealing ring 322, blocking block 323, covering ring 33, second raised ring 331, first raised ring 332, oil groove 333, annular structure 34, mounting ring 35, positioning skeleton 351, plastic layer 352, connecting through hole 36, second annular protrusion 37, first annular protrusion 38, nut slider 4, screw rod 5. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0034] like Figure 1 , 2As shown in , 4 and 5, an automatic door opening and closing driver comprises a mounting housing 2, a screw rod 5, a nut slider 4, a push rod 1 and a driving assembly. The screw rod 5 is rotatably arranged in the mounting housing 2, the nut slider 4 is sleeved on the screw rod 5 and is threadedly connected to the screw rod 5, and the driving assembly is arranged in the mounting housing 2 to drive the screw rod 5 to rotate. The nut slider 4 is hinged to one end of the push rod 1, and the other end of the push rod 1 extends out of the mounting housing 2 and is hinged to the vehicle body or the vehicle body. Considering the installation and layout of the driver, the other end of the push rod 1 is usually hinged to the vehicle body, and the entire driver is fixed on the vehicle door. Then, the screw rod 5 rotates under the action of the driving assembly, driving the nut slider 4 to move, and the movement of the nut slider 4 drives the push rod 1 to push the vehicle body, so that the entire driver rotates along the hinge point between the vehicle door and the vehicle body with the vehicle door, thereby realizing the opening or closing of the vehicle door.

[0035] Considering the stability of the door opening and closing, the push rod 1 adopts a special-shaped rod structure, which is usually a curved rod structure with a certain arc. This structure can adapt to the angle change during the door opening and closing process, can be stably extended and retracted, avoids the shaking of the door, and ensures the door is opened and closed stably. Therefore, the push rod 1 with a special-shaped rod structure is more suitable than the push rod 1 with a straight rod structure.

[0036] However, it is not clear how the waterproof cover matched with the special-shaped rod structure in the prior art can achieve sealed sliding cooperation with the push rod 1. Therefore, the utility model provides a matching sealing structure 3 based on the existing push rod 1 with the special-shaped rod structure.

[0037] like Figure 2-4 As shown, in one embodiment of the utility model, a sealing structure 3 of a push rod 1 is provided, and the sealing structure 3 includes an annular structure 34 composed of a built-in supporting skeleton 31 and an external elastic layer 32, and the elastic layer 32 is arranged along one end of the through cavity of the annular structure 34 and extends outward in parallel to form a covering ring 33 that wraps the push rod 1, and the inner wall of the covering ring 33 is provided with a first raised ring 332 arranged in an annular manner, and at least one second raised ring 331 is arranged at intervals on both sides of the first raised ring 332 on the inner wall of the covering ring 33, and an oil groove 333 for storing grease is formed between any adjacent first raised ring 332 and second raised ring 331 or between any two adjacent second raised rings 331; wherein, the first raised ring 332 and the second raised ring 331 are both interference fit with the push rod 1, and the annular center line of the first raised ring 332 and the center line of the push rod 1 at the contact position between the first raised ring 332 and the push rod 1 are arranged colinearly.

[0038] Theoretically, the annular structure 34 can be a hollow cylindrical structure, a rectangular cavity structure, a hollow truncated cone structure or other through-cavity structure. The setting of the annular structure 34 ensures that the push rod 1 can pass through, the annular structure 34 can be fixed to the channel of the installation shell 2, and the push rod 1 can cooperate with the covering ring 33. Therefore, the annular structure 34 can be any structure that can achieve the above functions. In this embodiment, if Figure 7 As shown, considering the movement of the push rod 1 of the special-shaped rod structure, the movement space (motion envelope) of each part of the push rod 1 in the annular structure 34, in this embodiment, as shown in FIG. Figure 6 As shown, the annular structure 34 adopts a flat structure with one end larger than the other end, a covering ring 33 is provided at the small end, and the large end is fixed with the channel of the mounting shell 2. This structure can ensure that the push rod 1 is not affected by the inner cavity structure of the annular structure 34 when moving. At the same time, it can also ensure the secondary sealing connection between the annular structure 34, the push rod 1 and the mounting shell 2, thereby ensuring the sealing effect of the driver.

[0039] In this embodiment, the annular structure 34 is composed of two layers of materials, inner and outer; wherein, the support frame 31 can be an injection molded part with sufficient hardness requirements; the elastic layer 32 can be made of rubber material to meet the elasticity requirements; the support frame 31 and the elastic layer 32 can be fixedly connected by secondary injection molding or by external rubber coating. The annular structure 34 composed of the support frame 31 and the elastic layer 32 can meet both the rigidity requirements and the elasticity requirements, ensuring that the position of the covering ring 33 of the annular structure 34 does not change substantially with the movement of the push rod 1 (relative to the mounting housing 2 of the driver), ensuring that the covering ring 33 is always wrapped outside the push rod 1.

[0040] The double-layer annular structure 34 can ensure that the covering ring 33 is always in contact with the push rod 1, and the position of the covering ring 33 will not change due to the movement of the push rod 1. After ensuring the installation position of the covering ring 33, the structure of the covering ring 33 is further set, and a first raised ring 332 and at least two second raised rings 331 are used to form at least two oil grooves 333. The first raised ring 332 and the second raised ring 331 are both interference fit with the push rod 1, which can effectively prevent foreign matter from entering the installation housing 2 of the driver along with the push rod 1; and the oil groove 333 is provided with grease, and the presence of the grease can make the push rod 1 slide smoothly along the covering ring 33, thereby achieving effective sealing of the push rod 1. Figure 8 As shown, the annular center line of the first raised ring 332 and the center line of the push rod 1 at the contact position between the first raised ring 332 and the push rod 1 are arranged colinearly, which means that the first raised ring 332 is not or is basically not affected by the movement of the push rod 1 and can always be wrapped around the outer wall of the push rod 1, so that the entire drive can achieve the protection level of IP6K7.

[0041] In another embodiment of the present invention, Figure 2 ,4 As shown in Figure 8, there are two second raised rings 331, and the two second raised rings 331 are respectively arranged on both sides of the first raised ring 332. The more the number of second raised rings 331 is, the greater the thickness of the corresponding covering ring 33 (the length of the through cavity), and the greater the contact area between the covering ring 33 and the push rod 1, which may affect the movement of the push rod 1. However, if one second raised ring 331 is provided, only one oil groove 333 can be formed, and the oil storage effect of one oil groove 333 is not easy to control, and the distance between the first raised ring 332 and the second raised ring 331 should not be too large; and if one second raised ring 331 is provided, there is also an unbalanced force problem on both sides of the first raised ring 332. For this reason, in this embodiment, a second raised ring 331 is respectively provided on both sides of the first raised ring 332 to ensure that the first raised ring 332 can always be provided with the same center line as the contact part of the push rod 1 during the movement of the push rod 1. In order to further enhance the lubricating oil preservation effect of the two second raised rings 331, in this embodiment, the inner walls of the two second raised rings 331 are inclined outwardly relative to the first raised ring. In this way, when the push rod 1 passes along the first raised ring 332, any second raised ring 331 can scrape off the grease on the push rod 1, ensuring that the grease can stay in the oil groove 333 for a long time, thereby extending the service life.

[0042] In another embodiment of the utility model, since the other end of the annular structure 34 is fixed to the channel of the mounting shell 2, and a seal is required between the two, in this embodiment, an annular plate 312 extending vertically outward is provided on the other end of the through cavity of the annular structure 34 along the support skeleton 31, and the elastic layer 32 covers both sides of the annular plate 312, and the elastic layer 32 covered outside the annular plate 312 is respectively provided with two annular sealing rings extending outward on both sides of the annular plate 312. The provision of the annular plate 312 can provide a clamping support structure, and it is only necessary to provide an annular groove for clamping the annular plate 312 on the mounting shell 2, and the two annular sealing rings and the inner wall of the annular groove can cooperate to form a double-layer sealing structure of a labyrinth structure, thereby achieving the sealing and fixation of the annular structure 34 and the mounting shell 2. The two annular sealing rings can be set to the same structure according to their functions and structures, or different structures can be adopted. In this embodiment, if Figure 3 As shown, the structures of the two annular sealing rings are slightly different, and they are divided into a first annular sealing ring 321 and a second annular sealing ring 322. The first annular sealing ring 321 is mainly against the side close to the covering ring 33, and the second annular sealing ring 322 is close to the position corresponding to the circumference of the annular plate 312. This method is more conducive to sealing and fixing the annular structure 34 and the mounting shell 2.

[0043] In another embodiment of the present invention, in order to increase the contact area between the support frame 31 and the elastic layer 32, and thus improve the connection stability between the two, in this embodiment, the outer wall of the support frame 31 is evenly distributed with a plurality of connection grooves 311, and the elastic layer 32 covers the plurality of connection grooves 311 and fits and fixes the support frame 31. The structure of the connection grooves 311 can be an annular or strip structure, and its purpose is to increase the contact area between the outer wall of the support frame 31 and the elastic layer 32 by setting a plurality of connection grooves 311. Figure 2 As shown, in this embodiment, a plurality of connection grooves 311 are arranged in a row along the through-cavity direction of the annular structure 34, and each connection groove 311 is an annular groove structure arranged along the through-cavity direction of the annular structure 34. This structure can achieve a larger contact area between the support frame 31 and the elastic layer 32, further improving the stability of the connection between the two.

[0044] In another embodiment of the utility model, in combination with the specific structure of the driving assembly, the sealing structure 3 can also be provided with other adapted structures. In this embodiment, the driving assembly adopts the matching mode of the worm gear assembly and the driving motor, the driving motor is a servo motor or a stepping motor, the output shaft of the driving motor and the worm are coaxially fixed, and the worm wheel and the screw 5 are coaxially fixed. Considering the waterproofness of the driving motor and the worm gear assembly, a gearbox housing 20 for sealing (or installing) the above components will be provided, and the gearbox housing 20 is embedded in the mounting housing 2, in order to facilitate the multiple sealing of the gearbox housing 20, the mounting housing 2 and the sealing structure 3. In this embodiment, the sealing structure 3 also includes a mounting ring 35, the mounting ring 35 and the annular structure 34 are arranged side by side, and the through-cavity direction of the mounting ring 35 is parallel to the through-cavity direction of the annular structure 34. The mounting ring 35 is provided for the screw 5 to pass through and install, and the mounting ring 35 and the annular structure 34 are an integrated structure and are arranged between the gearbox housing 20 and the mounting housing 2 for fixing. The sealing structure 3 of this structure is adapted to the driving assembly of the above structure to ensure that the entire drive can be effectively sealed.

[0045] In another embodiment of the utility model, since the mounting ring 35 and the annular structure 34 are an integrated structure, the mounting ring 35 also includes a built-in positioning frame 351 and an external plastic layer 352. The positioning frame 351 and the supporting frame 31 are fixed, and the plastic layer 352 and the elastic layer 32 are made of the same material and are integrally formed. Figure 4As shown, the positioning skeleton 351 is made of the same material and the same production process as the supporting skeleton 31, and the positioning skeleton 351 can provide sufficient hardness requirements; the plastic layer 352 and the elastic layer 32 are made of the same material, and the plastic layer 352 and the positioning skeleton 351 are fixed together with the elastic layer 32 and the supporting skeleton 31. It is worth noting that in order to improve the connection effect between the outer coating layer and the inner skeleton, a connecting through hole 36 is provided between the positioning skeleton 351 and the supporting skeleton 31, and the outer coated plastic layer 352 or the elastic layer 32 passes through the connecting through hole 36 and forms a blocking block 323, which is used to increase the connection effect between the outer coating layer and the skeleton.

[0046] In another embodiment of the utility model, the positioning skeleton is a plate-like structure, which is provided with a mounting through hole for the screw rod to pass through, and the plate-like structure and the annular plate are connected and arranged in parallel, and the plastic layer 352 is used to wrap the annular plate with the elastic layer 32 to cover the plate-like structure, and the plastic layer 352 is provided with two side sealing rings that are respectively connected and matched with the two annular sealing rings, and the corresponding side sealing rings and the annular sealing rings form an integrated annular protrusion structure. Since the two annular sealing rings are divided into a first annular sealing ring 321 and a second annular sealing ring 322, in this embodiment, Figure 6 As shown, the first annular sealing ring 321 and the corresponding edge sealing ring form an integrated first annular protrusion 38, and the second annular sealing ring 322 and the matching edge sealing ring form an integrated second annular protrusion 37. In this embodiment, the sealing structure of this structure can adapt to the installation of the above-mentioned drive assembly, and can use the installation gap between the gear box housing 20 and the installation housing to seal and fix the sealing structure, which is convenient for the installation of the driver and can achieve multi-layer sealing.

[0047] During installation, after the second annular sealing ring 322 is interference fit with the gear housing 20, the gear housing 20 installed with the sealing structure 3 is clamped at the end position of the mounting housing 2 and fixed with connecting bolts to achieve a sealed connection between the sealing structure 3 and the mounting housing 2 and the gear housing 20.

[0048] In another embodiment of the utility model, in theory, the push rod 1 is a special-shaped rod structure along its length direction, and the push rod 1 of this shape can effectively cooperate with the sealing structure 3 of the above structure to achieve the double sealing effect of the sealing structure 3 and the push rod 1 and the mounting housing 2. It is only necessary to ensure that the inner cavity structure of the covering ring 33 and the cross-sectional structure of the push rod 1 are compatible. To this end, the cross section of the push rod 1 along its length direction can be any one of circular, rectangular, lantern-shaped, isosceles trapezoidal, etc.

[0049] In another embodiment of the present invention, considering the wear effect of the push rod 1 and the covering ring 33, in this embodiment, as Figure 1 , 5As shown, the push rod 1 has a circular cross section along its length direction. The push rod 1 with a circular cross section can reduce the wear of the covering ring 33 and increase the service life of the sealing structure 3.

[0050] Effect verification:

[0051] The driver with the sealing structure 3 is subjected to the protection level test:

[0052] 1. Test standards

[0053] Dustproof test standard: ISO 20653-2013; Waterproof test standard: GB / T 4208-2017.

[0054] 2. Test requirements:

[0055] (1) Waterproof test requirements:

[0056] Immersion depth: 1m; Immersion time: 30min;

[0057] (2) Dustproof requirements:

[0058] ①Dust type: Arizona A2 dust,

[0059] ②Dust dosage: 2kg / m3,

[0060] ③Test time: blow dust for 6 seconds, pause for 15 minutes, and 20 cycles.

[0061] 3. Evaluation results:

[0062] 1) After being soaked in water, the product is taken out and operates normally;

[0063] 2) No water or dust enters the product.

[0064] The sealing structure 3 of the utility model can solve the dust and water proofing problem of the sliding part of the driver push rod 1 and the mounting housing 2, so that the driver can reach the IP6K7 protection grade.

[0065] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A push rod sealing structure, used in conjunction with a push rod (1) with a special-shaped rod structure, characterized in that: The sealing structure (3) comprises an annular structure (34) composed of a built-in support frame (31) and an external elastic layer (32); the elastic layer (32) is arranged along one end of the through cavity of the annular structure (34) and extends outwardly in parallel to form a covering ring (33) that wraps around the push rod (1); The inner wall of the covering ring (33) is provided with a first protruding ring (332) arranged in an annular manner, and at least one second protruding ring (331) is respectively arranged at intervals on both sides of the inner wall of the covering ring (33) located on the first protruding ring (332), and an oil groove (333) for storing grease is formed between any adjacent first protruding ring (332) and second protruding ring (331) or between any adjacent two second protruding rings (331); The first raised ring (332) and the second raised ring (331) are both interference fit with the push rod (1), and the annular center line of the first raised ring (332) and the center line of the push rod (1) at the contact position between the first raised ring (332) and the push rod (1) are arranged colinearly.

2. A sealing structure for a push rod according to claim 1, characterized in that: There are two second protruding rings (331), and the two second protruding rings (331) are respectively arranged on both sides of the first protruding ring (332), and the inner walls of the two second protruding rings (331) are inclined relatively outward along the first protruding ring (332).

3. A push rod sealing structure according to claim 1 or 2, characterized in that: The sealing structure (3) further comprises a mounting ring (35), wherein the mounting ring (35) and the annular structure (34) are arranged side by side, and the through-cavity direction of the mounting ring (35) is parallel to the through-cavity direction of the annular structure (34).

4. A sealing structure for a push rod according to claim 3, characterized in that: The mounting ring (35) comprises a built-in positioning frame (351) and an external plastic layer (352); the positioning frame (351) and the supporting frame (31) are fixed; the plastic layer (352) and the elastic layer (32) are made of the same material and are integrally formed.

5. A push rod sealing structure according to claim 1, 2 or 4, characterized in that: An annular plate (312) extending vertically outward is provided at the other end of the support frame (31) along the through cavity of the annular structure (34); the elastic layer (32) covers both sides of the annular plate (312); and the elastic layer (32) covering the outside of the annular plate (312) is provided with two annular sealing rings extending outward on both sides of the annular plate (312).

6. A push rod sealing structure according to claim 5, characterized in that: The outer wall of the support frame (31) is evenly distributed with a plurality of connection grooves (311), and the elastic layer (32) covers the plurality of connection grooves (311) and is fitted and fixed to the support frame (31).

7. A push rod sealing structure according to claim 1, 2 or 4, characterized in that: The outer wall of the support frame (31) is evenly distributed with a plurality of connection grooves (311), and the elastic layer (32) covers the plurality of connection grooves (311) and is fitted and fixed to the support frame (31).

8. A vehicle door automatic opening and closing actuator, characterized in that: It includes the sealing structure described in any one of claims 1 to 7, and also includes a mounting shell (2) and a push rod (1), one end of the push rod (1) extends out of a channel opened on the mounting shell (2), the other end of the push rod (1) is slidably arranged in the mounting shell (2), and the annular structure (34) is sleeved on the push rod (1) and the other end of the annular structure (34) is sealed and fixed to the channel.

9. The automatic door opening and closing actuator according to claim 8, characterized in that: The cross section of the push rod (1) along its length direction includes any one of a circular, rectangular and lantern shape.

10. The automatic door opening and closing actuator according to claim 9, characterized in that: The cross section of the push rod (1) along its length direction is circular.

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