Automatic door opening and closing actuator

Abstract

The utility model discloses an automatic door opening and closing driver, belonging to the technical field of automobile parts. The driver 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 reciprocatingly slidably arranged in the mounting shell, and also includes a sealing tube, which is sleeved outside the push rod, and one end of the sealing tube is provided with a covering ring of elastic material covering the push rod, and the other end of the sealing tube is sealed and fixed to the inner wall of the channel or the end of the channel. The overall structure of the driver of the utility model adopts an inner swing type driver similar to the prior art, so the door can be opened and closed only by the push rod extending and retracting along the mounting shell. For this purpose, an adapted sealing tube is provided between the channel of the mounting shell and the push rod, so that the gap between the channel and the push rod can be shielded, and dust and water from the outside are prevented from entering the interior of the mounting shell from the gap between the channel and the push rod, so that the entire driver has a better waterproof effect and can reach the protection level of IP6K7.

Description

Technical Field

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

[0002] With the popularity of new energy vehicles, electric vehicles have already occupied a large share in the automobile market. Their low noise, environmental protection and various high-tech configuration functions are the selling points that attract users. Among them, the automatic opening and closing of car doors, a function with a sense of technology, brings unparalleled practicality.

[0003] The existing electric opening system of automobile doors is also called automobile electric door, generally referred to as electric door. It is a combination of door opening driver, electric suction door lock, radar, ECU and other parts installed on the automobile door to open the automobile door electrically. The door can be opened and closed without manual push and pull. Among them, the driver is the core component to realize automatic opening and closing of the door, which can be divided into two structures: inner swing type (without motion envelope) and outer swing type (with motion envelope).

[0004] The external swing type drive is usually composed of a motor, a lead screw, a gear box and a bracket fixed to the car door. The drive motor drives the lead screw of the lead screw assembly to rotate, and then drives the gear box on the lead screw to shift phase. At the same time, the gear box will swing around the bracket to form an outer envelope, thereby realizing the electric opening and closing of the car door. However, due to the motion envelope of the outer shape, the above scheme requires a large gap with other moving parts in the door system, such as door and window glass, glass lifter, etc., which has the defects of large installation space, complex layout and low applicability. The internal swing type adopts an integrated structure, using a push rod with a curved telescopic setting to set the motion envelope inside the drive, and push the car door to realize the opening and closing of the door.

[0005] The structure of the inner swing drive in the prior art is such as the structure in the patent with patent application number CN202310518408.7 and the name of a vehicle side door opening drive device. The drive includes a housing assembly and a drive motor, a screw, a worm gear, a threaded rod, a sliding guide device and a driving connecting rod arranged in the housing assembly, wherein the threaded rod is rotatably connected in the housing assembly, the drive motor, the screw and the worm gear cooperate with each other to drive the threaded rod to reciprocate, the sliding guide device and the threaded rod are threadedly connected, one end of the driving connecting rod is hinged to the sliding guide device, and the other end extends out of the housing assembly and is hinged to the vehicle body. When in use, the rotation of the threaded rod drives the driving connecting rod to move and push the vehicle body, so that the door rotates along the hinge point between the door and the vehicle body, thereby achieving the purpose of opening and closing the door.

[0006] In the above patent, the inner swing type driver occupies less space in the door system than the outer swing type, and the system layout is relatively easy and more applicable. However, the inner swing type driver cannot achieve waterproof effect because it has no motion envelope. Even if the dustproof device (dustproof brush) in the patent can block some dust, the dustproof device cannot achieve the purpose of waterproofing the driver. Therefore, it is necessary to provide an inner swing type driver with waterproof function. Utility Model Content

[0007] In view of the deficiencies in the prior art, the utility model provides an automatic door opening and closing driver, which solves the problem that the inner swing type driver in the prior art has no waterproof capability.

[0008] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions: an automatic door opening and closing actuator, comprising a mounting housing and a push rod, one end of the push rod extends out of a channel opened on the mounting housing, the other end of the push rod is reciprocatingly slidably arranged in the mounting housing, and also comprises a sealing tube, the sealing tube sleeve is arranged outside the push rod, one end of the sealing tube is provided with a covering ring of elastic material covering the push rod, and the other end of the sealing tube is sealed and fixed to the inner wall of the channel or the end of the channel;

[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 overall structure of the actuator of the utility model adopts an inner swing type actuator similar to the prior art, so the door can be opened and closed only by extending and retracting the push rod along the mounting shell. To this end, an adapted sealing tube is arranged between the channel of the mounting shell and the push rod, so that the gap between the channel and the push rod can be blocked. The covering ring used in conjunction with the push rod is wrapped outside the push rod and can achieve sealed sliding with the push rod. Because the first raised ring and the second raised ring are both interference fit with the push rod, external impurities can be effectively prevented 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, and 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 arranged colinearly, which means that the first raised ring is not or basically not affected by the movement of the push rod, and can always be wrapped around the outer wall of the push rod, thereby preventing external dust and water from entering the interior of the installation housing through the gap between the covering ring and the push rod, so that the entire driver has a better waterproof effect and can reach the protection level of IP6K7.

[0013] Furthermore, the push rod extends along a curve to form a special-shaped rod structure.

[0014] Furthermore, the cross section of the push rod along its length direction is circular.

[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 tube includes a built-in supporting frame and an outer covering elastic layer, and the covering ring and the elastic layer are connected to form an integrated structure.

[0017] Furthermore, the supporting frame is a through-cavity structure, a covering ring is arranged at one end of the supporting frame, an annular plate extending vertically outward is provided at the other end of the supporting frame, a positioning plate extending parallel to and fixed is fixed on the annular plate, an installation through hole is opened on the positioning plate in the same direction as the through-cavity of the supporting frame, and an elastic layer covers the supporting frame, the annular plate and the positioning plate.

[0018] Furthermore, the elastic layer covers both sides of the annular plate and the positioning plate, and the elastic layer covering the outside of the annular plate and the positioning plate is provided with two annular sealing rings extending outward on both sides of the annular plate and the positioning plate respectively.

[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] Furthermore, it also includes a driving assembly, a screw and a nut slider. The driving assembly is arranged in the installation shell and is used to drive the screw to rotate. The screw is rotatably arranged in the installation shell. The threaded slider is sleeved on the screw and the screw is threadedly connected. One end of the push rod is located in the installation shell and is hinged to the threaded slider.

[0021] Furthermore, a threaded through hole is provided on the nut slider, the screw rod is sleeved in the threaded through hole and threadedly transmitted through the threaded through hole, the threaded slider is fixed with a buffer nut made of elastic material, the inner ring of the buffer nut is provided with a spiral line in the same direction as the threaded through hole, the buffer nut is sleeved outside the screw rod and is threadably connected to the screw rod and has an interference fit; and the center line of the buffer nut, the center line of the screw rod and the center line of the threaded through hole are colinearly arranged.

[0022] Furthermore, the nut slider includes a built-in metal frame and an external plastic layer that are wrapped and fixed. A mounting through hole is opened on the metal frame, and a plastic nut is fixed in the mounting through hole. The inner hole of the plastic nut is a threaded through hole.

[0023] Furthermore, a mounting groove is provided on the metal frame, the connecting end of the push rod is located in the mounting groove and is hinged to the mounting groove through a pin screw, and the center line of the pin screw is perpendicular to the center line of the threaded through hole;

[0024] The length direction of the push rod is parallel to the length direction of the screw rod, and the push rod rotates along the pin screw while moving with the rotation of the screw rod.

[0025] Furthermore, a connecting hole communicating with the mounting groove is provided on the nut slider, one end of the pin screw is fixed to the side wall of the mounting groove, and the other end of the pin screw is located in the mounting groove or in the connecting hole.

[0026] Furthermore, the outer wall of the plastic layer is in sliding contact with the inner wall of the mounting shell, the plastic layer is provided with a chamfered surface adapted to the bolt hole outside the mounting shell, and the chamfered surface is provided with an arc-shaped recessed area with the center facing outward. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the explosion structure of the utility model;

[0028] Figure 2 This is a cross-sectional view of the present invention;

[0029] Figure 3 Another cross-sectional view of the utility model;

[0030] Figure 4 It is a schematic diagram of the internal structure of the utility model;

[0031] Figure 5 Another cross-sectional view of the utility model;

[0032] Figure 6 for Figure 5 Enlarged view of the middle D part;

[0033] Figure 7 It is a partial schematic diagram of another cross-sectional view of the utility model;

[0034] Figure 8 An exploded schematic diagram of some components of the driver of the utility model;

[0035] Fig. 9 This is a schematic diagram of the appearance of the sealing tube of the utility model;

[0036] Fig.10 It is the envelope appearance diagram of the push rod motion of the utility model;

[0037] Fig.11 It is a motion plane diagram of the push rod of the utility model driver when it is in use and located at different positions of the mounting housing;

[0038] Fig.12 This is an exploded schematic diagram of the sliding pair structure and the mounting housing of the utility model;

[0039] Fig.13 It is a cross-sectional view along the axial direction of the screw rod when the sliding pair structure and the mounting housing of the utility model are assembled;

[0040] Fig.14 It is a cross-sectional view along the radial direction of the screw rod when the sliding pair structure and the mounting housing of the utility model are assembled;

[0041] Fig.15 for Fig.14 A schematic diagram of a structure in which the housing and the lead screw are removed;

[0042] Fig.16 It is a cross-sectional view of the nut slider of the utility model along the radial direction of the screw rod;

[0043] Fig.17 It is a cross-sectional view of the nut slider of the utility model along the axial direction of the screw rod.

[0044] In the figure: mounting shell 2, end cover 21, bolt hole 101, screw rod 5, push rod 3, sliding joint 31, hinge part 32, pin screw 4, nut slider 1, metal skeleton 11, plastic layer 12, buffer nut 13, mounting groove 131, mounting groove 14, connecting hole 141, chamfered surface 15, arc-shaped recessed area 151, auxiliary slider 16, slide groove 17, plastic nut 18, threaded through hole 181, gear housing 20, cover plate 201, annular groove 202, support skeleton 310, connecting groove 311, annular plate 312, elastic layer 320, blocking block 323, covering ring 33, second raised ring 331, first raised ring 332, oil groove 333, sealing tube 34, mounting through hole 35, positioning plate 351, connecting through hole 36, second annular protrusion 37, first annular protrusion 38. DETAILED DESCRIPTION

[0045] 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.

[0046] like Figure 1-4 As shown, the utility model discloses an automatic door opening and closing driver, the overall structure of which is similar to the prior art, including a mounting housing 2 and a screw rod 5, a nut slider 1, a push rod 3 and a driving assembly mounted in cooperation with the mounting housing 2. The mounting housing 2 is used to integrate various components to achieve an integrated installation of the driver; at the same time, a plurality of bolt holes 101 are provided on the mounting housing 2 for fixing to the vehicle body, so as to facilitate the fixing of the driver and the vehicle body.

[0047] Considering the spatial layout, the mounting shell 2 is a hollow strip structure. The screw rod 5 is rotatably connected inside the mounting shell 2 and is arranged along the length direction of the mounting shell 2. The nut slider 1 is sleeved on the screw rod 5 and is threadedly connected to the screw rod 5. At the same time, the threaded slider is slidably connected to the inner wall of the mounting shell 2 to define the cross-sectional structure of the mounting shell 2. The movement of the threaded slider on the screw rod 5 can be limited without adding an additional sliding pair. The movement of the nut slider 1 is used to drive the push rod 3 to extend and retract. To this end, one end of the push rod 3 is located on the inner wall of the mounting shell 2 and is hinged to the nut slider 1, and the other end of the push rod 3 extends out of the mounting shell 2 and is hinged to the vehicle body. The drive assembly is used to drive the screw rod 5 to rotate. The drive assembly is electrically controlled, such as a servo motor coaxially arranged with the screw rod 5. In this embodiment, Figure 1 , 4As shown, the drive assembly adopts a servo motor (stepping motor or other motor that can realize electric control), a worm and a worm wheel meshing with the worm. The worm and the servo motor are coaxially arranged, and the worm wheel and the screw 5 are coaxially fixed. In view of the fact that the worm needs to be arranged vertically with the screw 5, for this reason, a waterproof motor can be used in the servo motor, and the servo motor and the mounting housing 2 are waterproofly sealed and fixed at the position, so that water or dust can be prevented from entering the interior of the mounting housing 2 from the connection position between the servo motor and the mounting housing 2. When in use, the drive assembly receives the instruction of the controller (ECU of the vehicle body) to actuate, the drive assembly drives the screw 5 to rotate, and the nut slider 1 reciprocates on the screw 5 along the length direction of the screw 5, thereby driving the push rod 3 to reciprocate and drive the door to open and close. When the door needs to hover, the controller continuously energizes the drive assembly, and the dynamic power can ensure that the door overcomes its own gravity and hovers to maintain any slope and opening within the design requirements. Through the inner swing drive structure of the utility model, the problem of the drive having no motion envelope can be solved, and the function of facilitating the layout of the door can be achieved.

[0048] Since the other end of the push rod 3 needs to extend out of the mounting housing 2 so as to be hinged with the vehicle body, a passage for the push rod 3 to pass through is provided on the mounting housing 2. In this embodiment, the mounting housing 2 is provided with openings at both ends along its length, one end of which is detachably sealed with the end cover 21, and the other end is the passage. In order to make the entire driver have a better waterproof function, the gap between the passage and the push rod 3 needs to be sealed, and for this purpose, the utility model is also provided with a sealing sleeve.

[0049] Specifically, the sealing tube 34 is sleeved on the outside of the push rod 3, and one end of the sealing tube 34 is provided with a covering ring 33 of elastic material covering the push rod 3, and the other end of the sealing tube 34 is sealed and fixed to the inner wall of the channel or the end of the channel; the inner wall of the covering ring 33 is provided with a first raised ring 332, and at least one second raised ring 331 is provided 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 3, and the annular center line of the first raised ring 332 and the center line of the push rod 3 at the contact position between the first raised ring 332 and the push rod 3 are arranged colinearly.

[0050] The sealing tube 34 can be made of plastic or rubber as a whole. If the sealing tube 34 is made of rubber as a whole, it is necessary to consider the connection method between the sealing tube 34 and the inner wall or port of the channel, and the density connection between the sealing tube 34 and the channel can be achieved by gluing. If the sealing tube 34 is made of plastic, the sealing tube 34 and the channel can be fixed by snap-fitting and sealing pad or other fixing methods for sealing connection. The setting of the sealing tube 34 is used to block the gap between the push rod 3 and the channel, and the setting of the covering ring 33 further prevents external impurities (water, dust, etc.) from entering the installation housing 2 from the gap between the covering ring 33 and the push rod 3. In view of the fact that the push rod 3 will reciprocate during use, the setting of the covering ring 33 also needs to ensure the smooth movement of the push rod 3 while also having a good waterproof effect. To this end, the present embodiment is provided with a first raised ring 332 and a second raised ring 331 for use on the inner wall of the covering ring 33. The first raised ring 332 and the second raised ring 331 are both interference fit with the push rod 3, which can effectively prevent external impurities from entering the installation housing 2 of the driver along with the push rod 3; at the same time, an oil groove 333 is provided in the covering ring 33, and grease is provided in the oil groove 333. The presence of the grease can make the push rod 3 slide smoothly along the covering ring 33; and the annular center line of the first raised ring 332 and the center line of the push rod 3 at the contact position between the first raised ring 332 and the push rod 3 are arranged in a colinear manner, which means that the first raised ring 332 is not or is basically not affected by the movement of the push rod 3, and can always be wrapped around the outer wall of the push rod 3, thereby preventing external dust and water from entering the interior of the installation housing 2 through the gap between the covering ring 33 and the push rod 3, so that the entire driver has a better waterproof effect and can reach the protection level of IP6K7.

[0051] In another embodiment of the present invention, Figure 5 , 7As shown in Figure 11, 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 3, which may affect the movement of the push rod 3. 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 3 during the movement of the push rod 3. 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 relatively inclined outward along the first raised ring 332. In this way, when the push rod 3 passes along the first raised ring 332, any second raised ring 331 can scrape off the grease on the push rod 3, ensuring that the grease can stay in the oil groove 333 for a long time, thereby extending the service life.

[0052] In the prior art, the push rod 3 is a straight rod or a special-shaped rod. During the extension and retraction process of the push rod 3 with a straight rod structure in the mounting shell 2, the mounting shell 2 will also swing with the car door, resulting in a certain swing angle of the push rod 3 during the extension and retraction process. During this process, in order to ensure that the covering ring 33 always has an interference fit with the push rod 3, the structure of the sealing tube 34 can be made of rubber material, so that the side wall of the density tube can be bent and deformed to adapt to the movement of the push rod 3.

[0053] However, the push rod 3 of the straight rod structure requires a large internal space during the extension and retraction process in the mounting housing 2, that is, the size of the mounting housing 2 is too large, which is not conducive to the door layout. Therefore, the push rod 3 of the special-shaped rod structure can make the size of the entire mounting housing 2 smaller, which is more conducive to the space layout. For this reason, the push rod 3 can also be a special-shaped rod structure. In another embodiment of the utility model, in order to make the extension and retraction of the push rod 3 in the mounting housing 2 more stable, the push rod 3 extends along a curve to form a special-shaped rod structure. Figure 1 , 5As shown, the push rod 3 is in a strip-shaped structure, and a sliding joint 31 is fixed at one end of the push rod 3 in the length direction, and the sliding joint 31 is hinged to the nut slide seat, and a hinge part 32 is fixed at the other end of the push rod 3, and the hinge part 32 is connected to the vehicle body. The push rod 3 is in a smoothly transitioned curved structure along its length direction, and is a special-shaped rod structure with a crest and a trough. Compared with the pull rod of the straight rod structure, the pull rod of the special-shaped rod structure can be suitable for the angle change during the opening and closing process of the door, so that the pull rod can be stably extended and retracted, which can further reduce the shaking during the opening and closing process of the door, and make the opening and closing of the door more stable.

[0054] During the movement of the push rod 3 of the special-shaped rod structure, the offset position of the center line of the push rod 3 along the center line of the channel (or the covering ring 33) changes little with the movement of the push rod 3. At this time, the sealing tube 34 can be installed with a plastic material for positioning and sealing. It is only necessary to ensure that the covering ring 33 is a rubber material sleeved on the push rod 3 to achieve an interference fit between the two. In the present utility model, considering the installation of the covering ring 33 on the sealing tube 34, the sealing tube 34 is set to a double-layer structure of a built-in support frame 310 and an outer covering elastic layer 320, and the covering ring 33 and the elastic layer 320 are connected to form an integrated structure.

[0055] Theoretically, the sealing tube 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 sealing tube 34 ensures that the push rod 3 can pass through, the sealing tube 34 can be fixed to the channel of the installation shell 2, and the push rod 3 can cooperate with the covering ring 33. Therefore, the sealing tube 34 can be any structure that can achieve the above functions. In this embodiment, if Fig.10 As shown, considering the movement of the push rod 3 of the special-shaped rod structure, the movement space (motion envelope) of each part of the push rod 3 in the sealing tube 34, in this embodiment, as shown in FIG. Fig. 9 As shown, the sealing tube 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 3 is not affected by the inner cavity structure of the sealing tube 34 when moving. At the same time, it can also ensure the secondary sealing connection between the sealing tube 34, the push rod 3 and the mounting shell 2, thereby ensuring the sealing effect of the driver.

[0056] In order to adapt to the push rod 3 with a special-shaped structure, in this embodiment, the sealing tube 34 is composed of two layers of material, inner and outer; wherein, the support frame 310 can be an injection molded part with sufficient hardness requirements; the elastic layer 320 can be made of rubber material to meet the elasticity requirements; the support frame 310 and the elastic layer 320 can be fixedly connected by secondary injection molding or fixed by an external rubber coating process. The sealing tube 34 composed of the support frame 310 and the elastic layer 320 can meet both the rigidity requirements and the elasticity requirements, ensuring that the position of the covering ring 33 of the sealing tube 34 does not change substantially with the movement of the push rod 3 (relative to the mounting housing 2 of the driver), and ensuring that the covering ring 33 is always wrapped outside the push rod 3.

[0057] The double-layer sealing tube 34 can ensure that the covering ring 33 is always in contact with the push rod 3, and the position of the covering ring 33 will not change due to the movement of the push rod 3. 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 3, which can effectively prevent foreign matter from entering the installation housing 2 of the driver along with the push rod 3; and the oil groove 333 is provided with grease, and the presence of the grease can make the push rod 3 slide smoothly along the covering ring 33, thereby achieving effective sealing of the push rod 3. Fig.11 As shown, the annular center line of the first raised ring 332 and the center line of the push rod 3 at the contact position between the first raised ring 332 and the push rod 3 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 3 and can always be wrapped around the outer wall of the push rod 3, so that the entire drive can reach the protection level of IP6K7.

[0058] The push rod 3 is a special-shaped rod structure along its length direction. The push rod 3 of this shape can effectively cooperate with the sealing tube 34 of the above structure to achieve a double sealing effect of the sealing tube 34 and the push rod 3 and the mounting shell 2. It is only necessary to ensure that the inner cavity structure of the sheathing ring 33 and the cross-sectional structure of the push rod 3 are compatible. To this end, the cross-section of the push rod 3 along its length direction can be any one of circular, rectangular, lantern-shaped, isosceles trapezoidal, etc. In another embodiment of the present invention, considering the wear effect of the push rod 3 and the sheathing ring 33, in this embodiment, Figure 3 , 4 As shown, the cross section of the push rod 3 along its length direction is circular. The push rod 3 with a circular cross section can reduce the wear of the covering ring 33 and increase the service life of the sealing tube 34.

[0059] In another embodiment of the utility model, in order to increase the contact area between the support frame 310 and the elastic layer 320, and thus improve the connection stability between the two, in this embodiment, the outer wall of the support frame 310 is evenly provided with a plurality of connection grooves 311, and the elastic layer 320 covers the plurality of connection grooves 311 and is fixed to the support frame 310. 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 310 and the elastic layer 320 by setting a plurality of connection grooves 311. Fig. 9 As shown, in this embodiment, a plurality of connecting grooves 311 are arranged side by side along the through-cavity direction of the annular structure, and each connecting groove 311 is an annular groove structure arranged along the through-cavity direction of the annular structure. This structure can achieve a larger contact area between the support frame 310 and the elastic layer 320, further improving the stability of the connection between the two.

[0060] To facilitate the connection between the sealing tube 34 and the mounting housing 2 and to achieve a sealed connection between the drive assembly and the mounting housing 2, as Figure 1 , 2 As shown in , 7 and 8, a gear housing 20 is connected to one end of the installation housing 2 where a passage is provided; the lower end of the gear housing 20 is open and sealed to the servo motor housing; the worm gear and the screw are provided in the gear housing 20; the gear housing 20 is provided with a through groove along the length direction of the screw rod 5; one end of the through groove of the gear housing 20 is sleeved on the outer wall of the installation housing 2, and a card plate is provided on the inner wall of the gear housing 20 to be spaced apart from the open end of the installation housing 2, and the card plate and the open end of the installation housing 2 form an annular card groove 202 for installing the sealing tube 34; a cover plate 201 is provided at the other end of the through groove of the gear housing 20 to be sealed, and the cover plate 201, the gear housing 20 and the installation housing 2 are locked by connecting bolts and the sealing tube 34 is locked and fixed. In order to make the sealing tube 34 fit the annular card groove 202, the utility model defines the structure of the support frame 310. Specifically, the support frame 310 is a through-cavity structure, the covering ring 33 is arranged at one end of the support frame 310, and the other end of the support frame 310 is provided with an annular plate 312 extending vertically outward, and a positioning plate 351 extending and fixed in parallel is fixed on the annular plate 312, and the positioning plate 351 is provided with a mounting through hole 35 in the same direction as the through-cavity of the support frame 310, and the elastic layer 320 covers the support frame 310, the annular plate 312 and the positioning plate 351. The elastic layer 320 covers both sides of the ring 33-shaped plate 312 and the positioning plate 351, and the elastic layer 320 covered outside the annular plate 312 and the positioning plate 351, and two annular sealing rings extending outward are respectively provided on both sides of the annular plate 312 and the positioning plate 351.

[0061] like Figure 5 , 6As shown in FIG. 9 , the installation through hole 35 provided on the positioning plate 351 is convenient for the installation of the screw rod 5, so that the screw rod 5 can pass through. At the same time, the arrangement of the positioning plate 351 can also extend the extension area of ​​the annular plate 312 toward the screw rod 5. At the same time, this arrangement method also facilitates the support frame 310, the annular plate 312 and the positioning plate 351 to form an integrated support structure, and the integrated support structure can be injection molded, and the external elastic layer 320 is fixed to the internal support structure by external rubber coating or secondary injection molding. At the same time, due to the plug-in fit between the auxiliary housing and the mounting housing 2, an annular groove 202 for mounting the sealing tube 34 can be formed, and the annular plate 312 and the positioning plate 351 can constitute a clamping plate clamped in the annular groove 202. In order to achieve a sealed connection between the clamping plate and the annular groove 202, two annular sealing rings are provided. The two annular sealing rings are in sealing contact with the side wall of the annular groove 202 to form a labyrinth-structured sealing structure, thereby achieving double-layer sealing fixation of the sealing tube 34 and the gear housing 20 and the mounting housing 2. The two annular sealing rings can be set to the same structure according to their functions and structures, or different structures can be used. In this embodiment, as shown in FIG. Figure 5 , 6 As shown in Figures 9, the structures of the two annular sealing rings are slightly different, and they are divided into a first annular sealing ring and a second annular sealing ring. The first annular sealing ring is mainly against the side close to the covering ring 33, and the second annular sealing ring is close to the position corresponding to the circumference of the annular plate 312. This method is more conducive to sealing and fixing the sealing tube 34 and the gear housing 20 and the mounting housing 2.

[0062] To improve the connection effect between the outer coating layer (elastic layer 320) and the internal skeleton (support structure), Figure 7 , 4 As shown, a connecting through hole 36 is provided between the positioning plate 351 and the annular plate 312 , and the outer covering elastic layer 320 passes through the connecting through hole 36 and forms a blocking block 323 for increasing the connection effect between the outer covering layer and the frame.

[0063] 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.

[0064] Based on the driver structure above, the waterproof effect is verified:

[0065] 1. Test standards

[0066] Dustproof test standard: ISO 20653-2013; Waterproof test standard: GB / T 4208-2017.

[0067] 2. Test requirements:

[0068] (1) Waterproof test requirements:

[0069] Immersion depth: 1m; Immersion time: 30min;

[0070] (2) Dustproof requirements:

[0071] ①Dust type: Arizona A2 dust,

[0072] ②Dust dosage: 2kg / m3,

[0073] ③Test time: blow dust for 6 seconds, pause for 15 minutes, and 20 cycles.

[0074] 3. Evaluation results:

[0075] 1) After being soaked in water, the product is taken out and operates normally;

[0076] 2) No water or dust enters the product.

[0077] The sealing tube 343 of the utility model can solve the dust and water proofing problem of the sliding part of the driver push rod 31 and the mounting shell 22, so that the driver can reach the IP6K7 protection grade.

[0078] In another embodiment of the present invention, in order to reduce abnormal noise during the use of the driver, the present invention also improves the sliding pair structure of the driver. Figure 1 , 12 As shown, the sliding pair structure includes a nut slider 1, a push rod 3 and a screw rod 5, the push rod 3 and the screw rod 5 are arranged horizontally, and the screw rod 5 is rotatably connected in the mounting housing 2; a threaded through hole 181 is provided on the nut slider 1, the screw rod 5 is sleeved in the threaded through hole 181 and is threadedly driven by the threaded through hole 181, and the nut slider 1 is in contact with the inner wall of the mounting housing 2 and is slidably arranged; the push rod 3 is located above the screw rod 5, and one end of the push rod 3 extends out of the mounting housing 2 and is hinged to the door or the body, and the other end of the push rod 3 is hinged to the nut slider 1. When the screw rod 5 rotates under the action of the driving assembly, the nut slider 1 threadedly connected to the screw rod 5 moves along the length direction of the screw rod 5, driving the push rod 3 to extend out of the mounting housing 2, driving the door to rotate along the hinge point between the door and the body, and realizing the purpose of opening and closing the door.

[0079] When in use, as the push rod 3 moves with the nut slider 1, the other end of the push rod 3 also rotates with the hinge point between the push rod 3 and the nut slider 1, causing the nut slider 1 to have an additional force along the radial direction of the screw rod 5. The transmission clearance between the nut slider 1 and the screw rod 5 causes the nut slider 1 to move obliquely along the axial direction of the screw rod 5, resulting in an idle stroke of the push rod 3, thereby increasing the idle stroke of the door edge. When switching the door back and forth, the idle stroke of the push rod 3 causes the door to make an abnormal "clang" sound. In order to solve this problem, the utility model is also provided with a buffer nut 13. Fig.12 , 13 As shown in Figures 1 and 14, the buffer nut 13 is fixed to the nut slider 1, and a spiral line in the same direction as the threaded through hole 181 is opened on the inner ring of the buffer nut 13. The buffer nut 13 is sleeved on the screw rod 5 and the screw rod 5 is threadedly connected and interference fit; and the center line of the buffer nut 13, the center line of the screw rod 5 and the center line of the threaded through hole 181 are arranged in a colinear manner. The buffer nut 13 can be arranged at any end of the threaded through hole 181 or inside the threaded through hole 181. Considering the convenience of production and processing, the buffer nut 13 is arranged at any end of the threaded through hole 181 and connected to the threaded through hole 181. Specifically, a mounting groove 131 protruding outward along the threaded through hole 181 is provided on the nut slider 1, and the buffer nut 13 is embedded in the mounting groove 131. The buffer nut 13 and the mounting groove 131 can be fixed by interference fit or by key connection, and it is ensured that the buffer nut 13 and the nut slider 1 are fixedly connected. As shown in FIG. Fig.13 As shown, in this embodiment, the buffer nut 13 is arranged at one end of the threaded through hole 181 close to the push rod 3 (the left side in the figure), so that the mounting groove 131 of the nut slider 1 can extend into the gear box (the housing in which the drive assembly is mounted); if the buffer nut 13 is arranged on the right side of the threaded through hole 181 in the figure, the length of the product will increase, which is not conducive to miniaturization.

[0080] The buffer nut 13 added by the utility model is fixed to the nut slider 1 and has an interference fit with the screw rod 5, and the thread line of the inner ring of the buffer nut 13 is the same as the thread line of the threaded through hole 181. This means that during the rotation of the screw rod 5, the threaded through hole 181 will move, and provide sufficient driving force to force the buffer nut 13 to move with the nut slider 1. While ensuring that the movement of the nut slider 1 is not affected, the problem of transmission clearance between the screw rod 5 and the threaded through hole 181 can be eliminated, thereby ensuring that the center line of the buffer nut 13, the center line of the screw rod 5 and the center line of the threaded through hole 181 can always remain in line during the working process, ensuring that the screw rod 5 nut will not be deflected during the process of opening and closing the door, making the door opening and closing smoother, thereby reducing the idle travel when opening and closing the door, reducing the amount of shaking of the door, and eliminating the problem of "clang" abnormal noise when opening and closing the door.

[0081] In order to reduce wear, not affect the transmission of the nut slider 1 and reduce transmission noise, the buffer nut 13 of the utility model is made of elastic material. The elastic material can be rubber material, silicone rubber material, polyurethane elastomer, polyester elastomer, etc. in the prior art. In this embodiment, the buffer nut 13 is made of rubber material, and the rubber has a certain elasticity. While tightly covering the screw rod 5, it can move with the nut slider 1 under the action of external extrusion force (transmission force between the rotation of the screw rod 5 and the threaded through hole 181), ensuring that the nut slider 1 can slide back and forth on the screw rod 5.

[0082] The slider in the prior art is made of metal material as a whole to ensure sufficient rigidity and strength, and to ensure that the slider can be used for a long time; at the same time, a plastic lining is provided in the threaded hole of the slider and is threadedly connected to the screw rod 5 to reduce abnormal transmission noise and ensure the stability of the mutual movement of the slider and the screw rod 5. However, the outer wall of the slider needs to be in sliding contact with the inner wall of the mounting shell 2 of the driver, and the through groove of the mounting shell 2 is made of metal. If the slider is made of metal, the two are in rigid contact and the friction noise is relatively large. To solve this problem, in another embodiment of the utility model, the nut slider 1 adopts a double-layer structure, including a built-in metal frame 11 that is wrapped and fixed and an external plastic layer 12. A mounting through hole 35 is opened on the metal frame 11, and a plastic nut 18 is fixed in the mounting through hole 35. The inner hole of the plastic nut 18 is a threaded through hole 181. As Fig.13 , 14 As shown in Figures 15, 16 and 17, the nut slider 1 of the utility model includes a three-layer structure from the inside to the outside. The plastic nut 18 is the first layer structure. The plastic nut 18 and the threaded through hole 181 are fixed by interference fit or key connection. It can also be fixed with the plastic layer 12 in the direction of secondary injection molding and the threaded through hole 181. The plastic nut 18 and the screw rod 5 are threadedly connected, which reduces the transmission noise and has better wear resistance, so that the entire nut slider 1 can slide stably on the screw rod 5. The metal skeleton 11 is the second layer. The setting of the metal skeleton 11 can ensure that the entire nut slider 1 has sufficient rigidity and strength. The metal skeleton 11 can be die-casted by aluminum alloy or zinc alloy. The outermost plastic layer 12 is in sliding contact with the inner wall of the mounting shell 2, and the plastic layer 12 is obtained by secondary injection molding of the outer rubber. Therefore, the overall structure of the nut slider 1 is actually determined by the metal skeleton 11. The metal skeleton 11 has better strength and rigidity than the general method of using an intermediate metal core (cylindrical core). The outer plastic layer 12 can ensure that the contact parts between the nut slider 1 and the inner wall of the mounting shell 2 are made of plastic material. The sliding friction of the plastic material has the effect of reducing vibration and noise, so that the nut slider 1 of the utility model makes less noise during the movement in the mounting shell 2.

[0083] In order to reduce the distance between the center line of the push rod 3 and the center line of the screw rod 5 to improve work efficiency, the push rod 3 of the utility model is embedded in the nut slider 1 and hinged with the nut slider 1. In order to ensure that the connection between the push rod 3 and the nut slider 1 is more stable, the push rod 3 is connected to the metal frame 11. The metal frame 11 is provided with a mounting groove 14. The connecting end of the push rod 3 is located in the mounting groove 14 and is hinged to the mounting groove 14 through a pin screw 4. The center line of the pin screw 4 is perpendicular to the center line of the threaded through hole 181. The length direction of the push rod 3 is parallel to the length direction of the screw rod 5, and the push rod 3 rotates along the pin screw 4 while moving with the rotation of the screw rod 5. Fig.16 , 17As shown, the mounting groove 14 can adopt a rectangular groove structure or a rectangular through-cavity structure. The setting of the mounting groove 14 facilitates the end of the push rod 3 to be embedded in the mounting groove 14. The two side walls of the mounting groove 14 and the swing angle limit of the push rod 3, and the pin screw 4 and the metal frame 11 can have sufficient connection strength, so that the connection between the push rod 3 and the nut slider 1 is more stable. In this embodiment, the mounting groove 14 adopts a rectangular through-cavity structure, the direction of the rectangular through-cavity is consistent with the length direction of the screw rod 5, and the end of the sliding joint 31 of the push rod 3 is embedded in the mounting groove 14. The above structure can minimize the distance between the center line of the push rod 3 and the center line of the screw rod 5, and the design limit can reach within 20mm. The push rod 3 (sliding joint 31) can be firmly fixed on the nut slider 1 and can rotate around the pin screw 4, so that the internal space of the driver can be set more compactly, reducing the space occupation of the driver, which is more conducive to the installation and layout of the driver on different models of car doors.

[0084] In order to avoid the problem of rigid sliding abnormal noise caused by the pin screw 4 extending out of the nut slider 1 and contacting the inner wall of the mounting housing 2, and to facilitate the installation of the pin screw 4, in another embodiment of the utility model, a connecting hole 141 is provided on the nut slider 1 and is connected to the mounting groove 14. One end of the pin screw 4 is fixed to the side wall of the mounting groove 14, and the other end of the pin screw 4 is located in the mounting groove 14 or in the connecting hole 141. Fig.16 , 17 As shown, since the plastic layer 12 is wrapped along the outer side of the metal frame 11, the corresponding connection hole 141 opened on the metal frame 11 will not be covered by the plastic layer 12. When installing, the pin screw 4 is inserted from the connection hole 141 into the installation groove 14 and the through hole opened in the sliding joint 31 of the push rod 3, and is fastened to the threaded hole of the metal frame 11, so that the assembly of the push rod 3 and the nut slider 1 can be completed. Since the pin screw 4 can limit the push rod 3 in the up and down directions, the movement of the push rod 3 is more stable.

[0085] The mounting housing 2 needs to be fixed to the vehicle door, and for this purpose, a bolt hole 101 is provided on the outer side of the mounting housing 2. To ensure the stability of the connection between the mounting housing 2 and the vehicle door, the thickness of the outer wall corresponding to the bolt hole 101 must be consistent, which means that the outer wall position corresponding to the bolt hole 101 will be convex toward the inner wall of the mounting housing 2. In another embodiment of the utility model, in order to make the overall structure of the driver more compact, a chamfered surface 15 adapted to the bolt hole 101 outside the mounting housing 2 is provided on the plastic layer 12, and an arc-shaped recessed area 151 with the center of the circle facing outward is provided on the chamfered surface 15. Fig.15 , 16As shown, two relatively inclined chamfered surfaces 15 are provided at the upper corners of the plastic layer 12, and an arc-shaped recessed area 151 with the center facing outward is provided in the middle of the chamfered surface 15. The arc-shaped recessed area 151 and the bolt hole 101 are adapted to the corresponding protruding positions on the inner wall of the mounting shell 2. The arrangement of this structure can further reduce the design size of the mounting shell 2 and further ensure the compactness of the overall structure of the driver.

[0086] In the prior art, the nut slider 1 slides in the mounting housing 2, and a sliding groove or a sliding block protruding outward is provided on the nut slider 1, and a matching sliding block or sliding groove is provided on the inner wall of the mounting housing 2 to ensure that the nut slider 1 can slide and limit when moving on the screw rod 5. However, in the prior art, the setting position of the sliding block or sliding groove is between the screw rod 5 and the push rod 3 or above the push rod 3. This setting method is not conducive to the stable movement of the sliding block. For this reason, in another embodiment of the utility model, two inwardly recessed sliding grooves 17 and an outwardly protruding auxiliary slider 16 are provided on the nut slider 1, and the length direction of the sliding groove 17 is set along the length direction of the screw rod 5. Fig.14 As shown, two slide grooves 17 are arranged between the screw rod 5 and the push rod 3, and the auxiliary slider 16 is located below the screw rod 5. This layout can provide limiting support force for the screw rod 5 in the upper and lower directions, ensuring that the nut slider 1 slides smoothly along the screw rod 5 with better stability.

[0087] 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. An automatic door opening and closing actuator, comprising a mounting housing (2) and a push rod (3), wherein one end of the push rod (3) extends out of a channel provided on the mounting housing (2), and the other end of the push rod (3) is arranged to slide back and forth in the mounting housing (2), characterized in that: It also includes a sealing tube (34), which is sleeved outside the push rod (3), one end of the sealing tube (34) is provided with a covering ring (33) covering the push rod (3), and the other end of the sealing tube (34) is sealed and fixed to the inner wall of the channel or the end of the channel; 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 (3), and the annular center line of the first raised ring (332) and the center line of the push rod (3) at the contact position between the first raised ring (332) and the push rod (3) are arranged colinearly.

2. The automatic door opening and closing actuator according to claim 1, characterized in that: The push rod (3) extends along a curve to form a special-shaped rod structure.

3. The automatic door opening and closing actuator according to claim 2, characterized in that: The cross section of the push rod (3) along its length direction is circular.

4. The automatic door opening and closing actuator according to any one of claims 1 to 3, 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).

5. The automatic door opening and closing actuator according to claim 2 or 3, characterized in that: The sealing tube (34) comprises a built-in supporting frame (310) and an outer covering elastic layer (320), and the covering ring (33) and the elastic layer (320) are connected to form an integrated structure.

6. The automatic door opening and closing actuator according to claim 5, characterized in that: The support frame (310) is a through-cavity structure, the covering ring (33) is arranged at one end of the support frame (310), the other end of the support frame (310) is provided with an annular plate (312) extending vertically outward, a positioning plate (351) extending and fixed in parallel is fixed on the annular plate (312), the positioning plate (351) is provided with a mounting through hole (35) in the same direction as the through-cavity of the support frame (310), and the elastic layer (320) covers the support frame (310), the annular plate (312) and the positioning plate (351).

7. The automatic door opening and closing actuator according to claim 6, characterized in that: The elastic layer (320) is coated on both sides of the annular plate (312) and the positioning plate (351), and the elastic layer (320) coated outside the annular plate (312) and the positioning plate (351) is provided with two annular sealing rings extending outward on both sides of the annular plate (312) and the positioning plate (351).

8. The automatic door opening and closing actuator according to claim 5, characterized in that: The outer wall of the support frame (310) is evenly distributed with a plurality of connection grooves (311), and the elastic layer (320) covers the plurality of connection grooves (311) and is fitted and fixed to the support frame (310).

9. The automatic door opening and closing actuator according to claim 1, 2, 3, 6, 7 or 8, characterized in that: It also includes a driving assembly, a screw rod (5) and a nut slider (1), wherein the driving assembly is arranged in the mounting housing (2) and is used to drive the screw rod (5) to rotate, the screw rod (5) is rotatably arranged in the mounting housing (2), the threaded slider is sleeved on the screw rod (5) and the screw rod (5) is threadedly connected, and one end of the push rod (3) located in the mounting housing (2) is hinged to the threaded slider.

10. The automatic door opening and closing actuator according to claim 9, characterized in that: A threaded through hole (181) is provided on the nut slider (1), a screw rod (5) is sleeved in the threaded through hole (181) and is threadedly driven with the threaded through hole (181), a buffer nut (13) made of elastic material is fixed to the threaded slider, an inner ring of the buffer nut (13) is provided with a spiral line in the same direction as the threaded through hole (181), the buffer nut (13) is sleeved outside the screw rod (5) and is threadedly connected with the screw rod (5) and is interference fit; and the center line of the buffer nut (13), the center line of the screw rod (5) and the center line of the threaded through hole (181) are arranged on the same line.

11. The automatic door opening and closing actuator according to claim 10, characterized in that: The nut slider (1) comprises a built-in metal frame (11) and an external plastic layer (12) that are wrapped and fixed. A mounting through hole (35) is provided on the metal frame (11). A plastic nut (18) is fixed in the mounting through hole (35). The inner hole of the plastic nut (18) is a threaded through hole (181).

12. The automatic door opening and closing actuator according to claim 11, characterized in that: A mounting groove (14) is provided on the metal frame (11), the connecting end of the push rod (3) is located in the mounting groove (14) and is hingedly connected to the mounting groove (14) through a pin screw (4), and the center line of the pin screw (4) is perpendicular to the center line of the threaded through hole (181); The length direction of the push rod (3) is parallel to the length direction of the screw rod (5), and the push rod (3) rotates along the pin screw (4) while moving along with the rotation of the screw rod (5).

13. The automatic door opening and closing actuator according to claim 12, characterized in that: The nut slider (1) is provided with a connecting hole (141) which is arranged in communication with the mounting groove (14); one end of the pin screw (4) is fixed to the side wall of the mounting groove (14); and the other end of the pin screw (4) is located in the mounting groove (14) or in the connecting hole (141).

14. The automatic door opening and closing actuator according to any one of claims 11 to 13, characterized in that: The outer wall of the plastic layer (12) is in sliding contact with the inner wall of the mounting shell (2); the plastic layer (12) is provided with a chamfered surface (15) adapted to the bolt hole (101) outside the mounting shell (2); and the chamfered surface (15) is provided with an arc-shaped recessed area (151) with its center facing outward.

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