A vehicle door opening mechanism

Abstract

This utility model discloses a vehicle door opening mechanism, including a mounting housing, a motor, a transmission device, and a lead screw. The motor is mounted on the mounting housing; the transmission device is rotatably mounted on the mounting housing and drives the motor; the lead screw passes through the transmission device and drives the transmission device in a helical manner; wherein, the transmission device is provided with an elastic clamping structure, which abuts against the side wall of the helical transmission groove of the lead screw, and the transmission device can rotate relative to the lead screw. The vehicle door opening mechanism provided by this utility model can limit the relative offset between the lead screw and the transmission device caused by the threaded fit clearance, thereby improving the operational stability of the vehicle door opening mechanism.

Description

Technical Field

[0001] This utility model relates to the field of vehicle engineering technology, and in particular to a vehicle door opening mechanism. Background Technology

[0002] Existing vehicle door opening mechanisms generally include a motor, a lead screw, a transmission device, and a mounting housing. The motor is fixed to the mounting housing, the transmission device is rotatably mounted on the mounting housing, and the lead screw is helically driven by the transmission device. The motor is also connected to the transmission device. One end of the lead screw has a hinge, which is mounted to either the vehicle body or the door. Thus, the motor drives the transmission device to rotate, which in turn drives the lead screw to extend or retract, thereby causing the door to rotate relative to the vehicle body to open and close. In existing vehicle door opening mechanisms, the helical fit between the lead screw and the transmission device typically has a certain amount of thread fit clearance. This clearance causes relative misalignment between the lead screw and the transmission device during door opening and closing, leading to shaking and collisions, which affects the operation of the door opening mechanism. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a vehicle door opening mechanism that can limit the relative offset between the lead screw and the transmission device caused by the threaded fit clearance, thereby improving the operational stability of the vehicle door opening mechanism.

[0004] According to an embodiment of the present invention, a vehicle door opening mechanism includes a mounting housing, a motor, a transmission device, and a lead screw. The motor is mounted on the mounting housing; the transmission device is rotatably mounted on the mounting housing and is driven by the motor; the lead screw passes through the transmission device and is driven by the transmission device in a helical manner; wherein, the transmission device is provided with an elastic clamping structure, the elastic clamping structure abuts against the side wall of the helical transmission groove of the lead screw, and the transmission device is rotatable relative to the lead screw.

[0005] The vehicle door opening mechanism according to the embodiments of the present utility model has at least the following beneficial effects: The vehicle door opening mechanism provided by the present utility model can axially abut against the side wall of the spiral transmission groove of the lead screw through the elastic clamping structure, thereby limiting the relative offset between the lead screw and the transmission device caused by the thread fit clearance, thereby improving the operating stability of the door opening mechanism. In addition, since the transmission device can still rotate relative to the lead screw, the motor can still drive the lead screw to extend and retract axially through the transmission device to meet the working requirements.

[0006] According to some embodiments of the present invention, the elastic clamping structure includes at least two elastic parts and an abutting part disposed on the elastic parts. All the elastic parts are arranged around the circumference of the lead screw. The abutting part is inserted into the helical drive groove of the lead screw and abuts against the opposite side walls of the helical drive groove. The abutting part can slide along the helical drive groove.

[0007] According to some embodiments of the present invention, the elastic clamping structure further includes an elastic limiting ring, which is sleeved on all the elastic parts.

[0008] According to some embodiments of the present invention, the abutting part is helical and adapted to the helical transmission groove of the lead screw.

[0009] According to some embodiments of the present invention, one end of the lead screw is provided with an external connector, and an overload protector is provided between the lead screw and the external connector.

[0010] According to some embodiments of the present invention, the overload protector includes a bushing and a damping structure. The bushing is rotatably sleeved on one end of the lead screw, and one end of the bushing is fixedly connected to the external connector. The damping structure is disposed between the bushing and the lead screw.

[0011] According to some embodiments of the present invention, the damping structure includes an elastic sleeve and a ball. One end of the bushing near the lead screw is inserted into the elastic sleeve. The bushing has an installation hole. One end of the lead screw has a slot. The ball is installed in the installation hole and locked in the slot. The ball abuts against the elastic sleeve.

[0012] According to some embodiments of the present invention, the transmission device includes a transmission wheel and a transmission component. The transmission wheel is rotatably mounted on the mounting shell and is connected to the motor. The transmission wheel has a mounting cavity inside. The transmission component is oscillatingly mounted in the mounting cavity and drives the transmission wheel. The lead screw passes through the transmission component and drives the transmission component in a helical manner. The elastic pressing structure is provided on the transmission component.

[0013] According to some embodiments of this utility model, the inner wall of the mounting cavity is provided with at least two toothed grooves, all of which are distributed around the rotation axis of the transmission wheel. The bottom wall of the toothed groove is part of a sphere, and the side wall of the toothed groove extends along the rotation axis of the transmission wheel. At least two transmission teeth are protruding from the outer periphery of the transmission member. All of the transmission teeth are inserted into all of the toothed grooves in a one-to-one correspondence. The outer side wall of each transmission tooth fits against the bottom wall of the corresponding toothed groove. The transmission wheel can drive the transmission member to rotate relative to the lead screw through the cooperation between the side wall of the toothed groove and the corresponding transmission tooth.

[0014] According to some embodiments of the present invention, an elastic element is held between the transmission tooth and the side wall of the corresponding tooth groove, or the transmission tooth and the side wall of the corresponding tooth groove can abut against each other and at least one of them is elastic, so that the transmission element can swing relative to the transmission wheel.

[0015] According to some embodiments of the present invention, there is a movable gap between the transmission tooth and the side wall of the corresponding tooth groove, so that the transmission member can swing relative to the transmission wheel along the bottom wall of the tooth groove.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a schematic diagram of a vehicle door opening mechanism according to an embodiment of the present utility model;

[0019] Figure 2 for Figure 1 A cross-sectional view of the vehicle door opening mechanism is shown.

[0020] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0021] Figure 4 for Figure 2 The diagram shows the interaction between the lead screw and the elastic clamping structure of the vehicle door opening mechanism;

[0022] Figure 5 for Figure 2 A schematic diagram of the transmission components and elastic clamping structure of the vehicle door opening mechanism is shown.

[0023] Figure 6 for Figure 2 An exploded view of the drive wheel of the vehicle door opening mechanism is shown.

[0024] Figure 7 for Figure 2 Enlarged view of point A in the middle.

[0025] Figure label:

[0026] Mounting housing 100, motor 200, transmission device 300, transmission wheel 310, mounting sleeve 310a, disc gear 310b, mounting cavity 311, tooth groove 3111, transmission component 320, transmission tooth 321, elastic clamping structure 330, elastic part 331, abutment part 332, elastic limit ring 333, lead screw 400, spiral transmission groove 410, slot 420, overload protector 500, bushing 510, mounting hole 511, damping structure 520, elastic sleeve 521, through hole 5211, ball 522, external component 600, first bearing 710, second bearing 720. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0028] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0030] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0031] In the specific implementation process, due to certain machining errors in the transmission threads on the lead screw 400 and the transmission threads on the transmission device 300, in order to avoid interference between the transmission threads on the lead screw 400 and the transmission threads on the transmission device 300, which would cause the lead screw 400 and the transmission device 300 to be unable to transmit power, a certain thread fit clearance is required between the transmission threads on the lead screw 400 and the transmission threads on the transmission device 300.

[0032] Reference Figures 1 to 3 According to an embodiment of the present invention, a vehicle door opening mechanism includes a mounting housing 100, a motor 200, a transmission device 300, and a lead screw 400. The motor 200 is mounted on the mounting housing 100; the transmission device 300 is rotatably mounted on the mounting housing 100 and is in a transmission cooperation with the motor 200; the lead screw 400 passes through the transmission device 300 and is in a helical transmission cooperation with the transmission device 300; wherein, the transmission device 300 is provided with an elastic pressing structure 330, the elastic pressing structure 330 abuts against the side wall of the helical transmission groove 410 of the lead screw 400, and the transmission device 300 is rotatable relative to the lead screw 400.

[0033] The vehicle door opening mechanism provided by this utility model can axially abut against the side wall of the helical transmission groove 410 of the lead screw 400 through the elastic clamping structure 330. This limits the relative offset between the lead screw 400 and the transmission device 300 caused by the threaded fit clearance, reduces the speed of relative offset, and thus reduces relative shaking and collision impact between the lead screw 400 and the transmission device 300, suppresses noise generation, and improves the operational stability of the door opening mechanism. The elastic clamping structure 330 also reduces the thread machining accuracy requirements between the lead screw 400 and the transmission device 300, thereby reducing costs.

[0034] Furthermore, since the transmission device 300 can still rotate relative to the lead screw 400, the motor 200 can still drive the lead screw 400 to extend and retract axially through the transmission device 300 to meet the working requirements.

[0035] Reference Figure 2 and Figure 3 According to some embodiments of this utility model, the transmission device 300 includes a transmission wheel 310 and a transmission component 320. The transmission wheel 310 is rotatably mounted on the mounting shell 100 and is connected to the motor 200. A mounting cavity 311 is provided inside the transmission wheel 310. The transmission component 320 is oscillatingly mounted in the mounting cavity 311 and engages with the transmission wheel 310. A lead screw 400 passes through the transmission component 320 and engages with it in a helical transmission. An elastic clamping structure 330 is provided on the transmission component 320. With the above configuration, the transmission device 300 can both drive the lead screw 400 to extend and retract axially and allow the lead screw 400 to swing relative to the mounting shell 100 to adjust its angle.

[0036] Reference Figures 3 to 5According to some embodiments of this utility model, the elastic clamping structure 330 includes at least two elastic portions 331 and abutment portions 332 disposed on the elastic portions 331. All the elastic portions 331 are arranged around the circumference of the lead screw 400. The abutment portions 332 are inserted into the helical transmission groove 410 of the lead screw 400 and abut against the opposite side walls of the helical transmission groove 410. The abutment portions 332 can slide along the helical transmission groove 410. Thus, by utilizing the elastic force of the elastic portions 331, the abutment portions 332 can effectively abut against the opposite side walls of the helical transmission groove 410, thereby limiting the axial displacement in both directions between the lead screw 400 and the transmission device 300, and also limiting the radial displacement between the lead screw 400 and the transmission device 300. Since the abutment portions 332 can slide along the helical transmission groove 410, the transmission device 300 can rotate relative to the lead screw 400. Therefore, the motor 200 can drive the lead screw 400 to extend and retract axially by driving the transmission device 300 to rotate.

[0037] In practice, each elastic part 331 may be provided with one or more abutment parts 332.

[0038] Reference Figures 3 to 5 According to some embodiments of the present invention, the elastic clamping structure 330 further includes an elastic limiting ring 333, which is sleeved on all the elastic parts 331. The setting of the elastic limiting ring 333 can make all the elastic parts 331 maintain a tendency to move towards the lead screw 400, thereby making the abutment part 332 tightly abut against the opposite side walls of the helical transmission groove 410.

[0039] Of course, in other embodiments, the elastic part 331 can be bent toward the lead screw 400 so that the elastic part 331 itself can be used to drive the abutment part 332 to abut against the opposite side walls of the helical transmission groove 410.

[0040] Reference Figures 3 to 5 According to some embodiments of the present invention, the abutment portion 332 is helical and adapted to the helical transmission groove 410 of the lead screw 400. Thus, the abutment portion 332 and the opposite side walls of the helical transmission groove 410 can better abut and cooperate, thereby more effectively limiting the relative offset and wobbling between the lead screw 400 and the transmission device 300.

[0041] In the specific implementation process, the above-mentioned elastic clamping structure 330 and transmission component 320 can be processed together or processed independently.

[0042] Reference Figure 1 , Figure 2 and Figure 7According to some embodiments of this utility model, an external connector 600 is provided at one end of the lead screw 400, and an overload protector 500 is provided between the lead screw 400 and the external connector 600. Therefore, when the vehicle door is obstructed by foreign objects or a person during the opening or closing process of the vehicle door opening mechanism, the overload protector 500 can prevent the lead screw 400 from transmitting excessive power to the external connector 600, thereby preventing excessive impact on the door or the person and protecting the door or the person. Additionally, it can also prevent the motor 200 from overloading. Furthermore, placing the overload protector 500 between the external connector 600 and the lead screw 400, so that the overload protector 500 is outside the mounting housing 100, facilitates the installation of the overload protector 500 and also facilitates its later maintenance and replacement.

[0043] In specific implementation, the external connector 600 is a hinge to allow rotational freedom between the lead screw 400 and the hinge. Of course, in other embodiments, the external connector 600 can also be configured as a universal joint.

[0044] Reference Figure 2 and Figure 7 According to some embodiments of the present invention, the overload protector 500 includes a bushing 510 and a damping structure 520. The bushing 510 is rotatably sleeved on one end of the lead screw 400. One end of the bushing 510 is fixedly connected to the external connector 600 by means of screwing, welding or other methods. The damping structure 520 is disposed between the bushing 510 and the lead screw 400 to generate damping between the bushing 510 and the lead screw 400 to restrict the relative rotation of the bushing 510 and the lead screw 400. Under normal conditions without overload, since the moving resistance of the external connector 600 is small, the resistance to the axial extension and retraction of the lead screw 400 will not be excessive. During the transmission of power from the transmission device 300 to the lead screw 400, the torque transmitted by the transmission device 300 to the lead screw 400 cannot overcome the damping between the bushing 510 and the lead screw 400, so the lead screw 400 will not rotate relative to the external connector 600. At this time, the power transmitted by the transmission device 300 to the lead screw 400 mainly drives the axial extension and retraction of the lead screw 400, thereby pushing the external connector 600. The connecting part 600 moves; in the event of overload, due to the large moving resistance of the connecting part 600, the axial extension and contraction of the lead screw 400 are affected. During the process of the transmission device 300 transmitting power to the lead screw 400, the torque transmitted by the transmission device 300 to the lead screw 400 can overcome the damping between the bushing 510 and the lead screw 400, so that the transmission device 300 can drive the lead screw 400 to rotate synchronously, causing the lead screw 400 to slip and thus preventing the lead screw 400 from transmitting a larger thrust to the connecting part 600.

[0045] Since the transmission device 300 and the lead screw 400 are connected by a helical transmission, the torque on the lead screw 400 is generally much smaller than the axial thrust on the lead screw 400. The overload protector 500 provided by this utility model uses the torque on the lead screw 400 as the overload control object, and controls a large thrust with a small torque. This reduces the size requirements of each structure of the overload protector 500, which is conducive to the miniaturization of the overload protector 500 and thus reduces costs.

[0046] Reference Figure 7 According to some embodiments of this utility model, the damping structure 520 includes an elastic sleeve 521 and a ball 522. One end of the bushing 510 near the lead screw 400 is inserted into the elastic sleeve 521. The bushing 510 has an installation hole 511. One end of the lead screw 400 is provided with a groove 420. The ball 522 is installed in the installation hole 511 and locked in the groove 420. The ball 522 abuts against the elastic sleeve 521. Thus, the elastic force of the elastic sleeve 521 can be used to lock the ball 522 in the groove 420, thereby increasing the damping between the bushing 510 and the lead screw 400. When the overload protector 500 is overloaded, the torque on the lead screw 400 can overcome the damping between the bushing 510 and the lead screw 400, so that the lead screw 400 can rotate relative to the bushing 510. At this time, the ball 522 disengages from the groove 420 and presses against the elastic sleeve 521. With the above settings, the damping structure 520 is simple in structure, easy to install, and convenient for later disassembly and replacement.

[0047] Reference Figure 7 According to some embodiments of this utility model, the elastic sleeve 521 has a through hole 5211 corresponding to the ball 522, and one end of the ball 522 is inserted into the through hole 5211. By controlling the size of the through hole 5211, the elastic force of the elastic sleeve 521 on the ball 522 can be controlled.

[0048] In other embodiments, the damping structure 520 described above may also be configured in other ways. For example, the damping structure 520 includes a damping sleeve with an uneven structure, and the damping sleeve is embedded between the bushing 510 and the lead screw 400.

[0049] Reference Figure 3 , Figure 4 and Figure 6According to some embodiments of the present invention, the inner wall of the mounting cavity 311 is provided with at least two toothed grooves 3111. All the toothed grooves 3111 are distributed around the rotation axis of the transmission wheel 310. The bottom wall of the toothed groove 3111 is part of a sphere. The side wall of the toothed groove 3111 extends along the rotation axis of the transmission wheel 310. At least two transmission teeth 321 are protruding on the outer periphery of the transmission member 320. All the transmission teeth 321 are inserted into all the toothed grooves 3111 in a one-to-one correspondence. The outer side wall of each transmission tooth 321 is in contact with the bottom wall of the corresponding toothed groove 3111. The transmission wheel 310 can drive the transmission member 320 to rotate relative to the lead screw 400 through the cooperation between the side wall of the toothed groove 3111 and the corresponding transmission tooth 321. With the above configuration, the outer wall of the transmission tooth 321 on the transmission member 320 and the bottom wall of the tooth groove 3111 on the transmission wheel 310 can abut and fit against each other. Since the bottom wall of the tooth groove 3111 is part of a sphere, the contact area between the outer wall of the transmission tooth 321 and the bottom wall of the tooth groove 3111 can be larger. As a result, during the transmission engagement between the transmission wheel 310 and the transmission member 320, the transmission wheel 310 can more stably support the transmission member 320, making the transmission stability between the transmission wheel 310 and the transmission member 320 better and the operation more reliable. Furthermore, the transmission member 320 can swing along the bottom wall of the tooth groove 3111, allowing the lead screw 400 to swing more stably relative to the mounting housing 100.

[0050] According to some embodiments of this utility model, there is a movable gap between the transmission tooth 321 and the side wall of the corresponding tooth groove 3111, so that the transmission member 320 can swing relative to the transmission wheel 310 along the bottom wall of the tooth groove 3111. When the transmission tooth 321 contacts and abuts against one side wall of the tooth groove 3111, power can be transmitted between the transmission wheel 310 and the transmission member 320. With the above configuration, the structure of the transmission member 320 is relatively simple and the cost is low.

[0051] According to other embodiments of the present invention, an elastic element is held between the transmission tooth 321 and the sidewall of the corresponding tooth groove 3111, or the transmission tooth 321 and the sidewall of the corresponding tooth groove 3111 can abut against each other and at least one of them is elastic. All of the above arrangements allow the transmission member 320 to swing relative to the transmission wheel 310. Through these arrangements, an elastic transmission structure can be formed between the transmission wheel 310 and the transmission member 320. This elastic transmission structure allows the transmission member 320 to swing relative to the transmission wheel 310 while simultaneously realizing transmission between the transmission wheel 310 and the transmission member 320, and increases the contact area between the transmission wheel 310 and the transmission member 320 for transmission. This effectively reduces stress concentration between the transmission wheel 310 and the transmission member 320, making the transmission fit between the transmission wheel 310 and the transmission member 320 more reliable and tighter. It also buffers vibrations and impacts between the transmission wheel 310 and the transmission member 320, reducing noise.

[0052] Reference Figure 3 and Figure 6 According to some embodiments of the present invention, in order to facilitate the installation of the transmission component 320, the transmission wheel 310 can adopt a split structure, in which case the transmission wheel 310 is formed by assembling at least two or more sub-components along the axis.

[0053] Reference Figure 3 and Figure 6 Specifically, in some embodiments, the transmission wheel 310 includes two mounting sleeves 310a and a disc gear 310b. The two mounting sleeves 310a are inserted into the two ends of the disc gear 310b in a one-to-one correspondence. The mounting cavity 311 is formed by the two mounting sleeves 310a. The mounting sleeves 310a are rotatably mounted on the mounting shell 100. The disc gear 310b can drive the mounting sleeves 310a to rotate. The disc gear 310b is connected to the motor 200 for transmission. The two mounting sleeves 310a are rotatably mounted on the mounting shell 100 via a first bearing 710 and a second bearing 720 in a one-to-one correspondence. The two opposite sides of the two mounting sleeves 310a and the disc gear 310b are correspondingly fitted. With the above configuration, the two mounting sleeves 310a have the same structure, and only one mold is needed to produce both mounting sleeves 310a, thereby reducing the overall production cost of the transmission wheel 310. Furthermore, the disc gear 310b can be replaced after wear.

[0054] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A vehicle door opening mechanism, characterized in that, include: Mounting housing (100); The motor (200) is mounted in the mounting housing (100); A transmission device (300) is rotatably mounted on the mounting housing (100), and the transmission device (300) is in transmission cooperation with the motor (200); A lead screw (400) is inserted into the transmission device (300), and the lead screw (400) and the transmission device (300) are engaged in helical transmission. The transmission device (300) is provided with an elastic clamping structure (330), which abuts against the side wall of the spiral transmission groove (410) of the lead screw (400), and the transmission device (300) is able to rotate relative to the lead screw (400).

2. The vehicle door opening mechanism according to claim 1, characterized in that, The elastic clamping structure (330) includes at least two elastic parts (331) and abutment parts (332) disposed on the elastic parts (331). All the elastic parts (331) are arranged around the circumference of the lead screw (400). The abutment parts (332) are inserted into the helical drive groove (410) of the lead screw (400) and abut against the opposite side walls of the helical drive groove (410). The abutment parts (332) can slide along the helical drive groove (410).

3. A vehicle door opening mechanism according to claim 2, characterized in that, The elastic compression structure (330) further includes an elastic limiting ring (333), which is sleeved on all the elastic parts (331).

4. A vehicle door opening mechanism according to claim 2, characterized in that, The abutment portion (332) is helical and is adapted to the helical drive groove (410) of the lead screw (400).

5. A vehicle door opening mechanism according to claim 1, characterized in that, An external connector (600) is provided at one end of the lead screw (400), and an overload protector (500) is provided between the lead screw (400) and the external connector (600).

6. A vehicle door opening mechanism according to claim 5, characterized in that, The overload protector (500) includes a bushing (510) and a damping structure (520). The bushing (510) is rotatably sleeved on one end of the lead screw (400). One end of the bushing (510) is fixedly connected to the external connector (600). The damping structure (520) is disposed between the bushing (510) and the lead screw (400).

7. A vehicle door opening mechanism according to claim 6, characterized in that, The damping structure (520) includes an elastic sleeve (521) and a ball (522). The end of the bushing (510) near the lead screw (400) is inserted into the elastic sleeve (521). The bushing (510) has an installation hole (511). One end of the lead screw (400) is provided with a slot (420). The ball (522) is installed in the installation hole (511) and locked in the slot (420). The ball (522) abuts against the elastic sleeve (521).

8. A vehicle door opening mechanism according to any one of claims 1 to 7, characterized in that, The transmission device (300) includes a transmission wheel (310) and a transmission component (320). The transmission wheel (310) is rotatably mounted on the mounting shell (100). The transmission wheel (310) is connected to the motor (200) for transmission. The transmission wheel (310) has a mounting cavity (311) inside. The transmission component (320) is oscillatingly mounted in the mounting cavity (311) and is in transmission cooperation with the transmission wheel (310). The lead screw (400) passes through the transmission component (320) and is in helical transmission cooperation with the transmission component (320). The elastic pressing structure (330) is disposed on the transmission component (320).

9. A vehicle door opening mechanism according to claim 8, characterized in that, The inner wall of the mounting cavity (311) is provided with at least two toothed grooves (3111). All the toothed grooves (3111) are distributed around the rotation axis of the transmission wheel (310). The bottom wall of the toothed groove (3111) is part of a spherical surface. The side wall of the toothed groove (3111) extends along the rotation axis of the transmission wheel (310). At least two transmission teeth (321) are protruding from the outer periphery of the transmission member (320). All the transmission teeth (321) are inserted into all the toothed grooves (3111) in a one-to-one correspondence. The outer side wall of each transmission tooth (321) fits against the bottom wall of the corresponding toothed groove (3111). The transmission wheel (310) can drive the transmission member (320) to rotate relative to the lead screw (400) through the cooperation between the side wall of the toothed groove (3111) and the corresponding transmission tooth (321).

10. A vehicle door opening mechanism according to claim 9, characterized in that: An elastic element is held between the transmission tooth (321) and the sidewall of the corresponding tooth groove (3111), or the transmission tooth (321) and the sidewall of the corresponding tooth groove (3111) can abut against each other and at least one of them is elastic, so that the transmission element (320) can swing relative to the transmission wheel (310); or, There is a movable gap between the transmission tooth (321) and the side wall of the corresponding tooth groove (3111) so that the transmission member (320) can swing relative to the transmission wheel (310) along the bottom wall of the tooth groove (3111).

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