Vehicle door driving mechanism

Abstract

The vehicle door driving mechanism comprises a driving assembly, a transmission assembly, a shell and a vehicle body support, the transmission assembly comprises a lead screw, a driving wheel, a transmission sleeve, a transmission nut and a pin shaft, and the driving wheel is provided with a first transmission block and a first mounting groove at an interval; the transmission sleeve is provided with a second transmission block and a second mounting groove at intervals, the driving wheel is connected with the transmission sleeve, the transmission nut is arranged in the transmission sleeve, the transmission sleeve is provided with a first penetrating hole, the transmission nut is provided with an axial threaded hole and is in threaded connection with the lead screw through the threaded hole, and the transmission nut is provided with a radial mounting groove. The pin shaft penetrates through the first penetrating hole to be inserted into the mounting groove, the shell is mounted at the position, close to the hinge, of the automobile door, the automobile body support is mounted on an automobile body, the lead screw is rotatably connected with the automobile body support, and the driving assembly drives the driving wheel to rotate so as to drive the lead screw to linearly move, so that the automobile door is driven to be opened or closed. According to the mechanism, the vehicle door can be kept hovering under the limiting working condition, and high safety is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle door driving, and in particular relates to a vehicle door driving mechanism. Background Art

[0002] In the existing technology, car doors are usually opened and closed manually, and the conventional mechanical limiter adopts three-stage limiter. The manual operating force varies greatly between the gears, and the manual force is abrupt when switching between gears, which makes the hand feel poor. In addition, the conventional mechanical limiter cannot hover in extreme working conditions such as up, down, and side slopes, and the door may fall,

[0003] Automatic opening can easily lead to collision or pinching accidents. When the door is open, it may strike external obstacles, damaging the door or causing other accidents. When the door is closed, it may not fully close and be in a semi-locked state. This can easily open while driving and cause accidents, compromising safety, or trapping people's hands and feet, causing personal injuries.

[0004] While electric door designs exist, most utilize zippers, racks, hinges, or parallel shafts. These structures often suffer from numerous parts, complex construction, high noise levels, and high costs. They also lack the ability to achieve upward, downward, or sideways hovering. Furthermore, due to limited door space, most existing electric door designs are difficult to install. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a door drive mechanism in response to the above-mentioned deficiencies in the prior art, which can effectively keep the door suspended under extreme working conditions such as up / down / side slopes, and has high safety.

[0006] In order to solve the above problems, the present invention adopts the following technical solutions:

[0007] A vehicle door drive mechanism includes a drive assembly, a transmission assembly, a housing and a vehicle body bracket. The transmission assembly is arranged in the housing and includes a screw, a drive wheel, a transmission sleeve, a transmission nut and a pin. The output end of the drive assembly is connected to the drive wheel. A plurality of first transmission blocks are provided at intervals on the inner surface of the drive wheel, and a first mounting groove is provided between two adjacent first transmission blocks; a plurality of second transmission blocks are provided at intervals on the outer surface of the transmission sleeve, and a second mounting groove is provided between two adjacent second transmission blocks. The connection between the drive wheel and the transmission sleeve is achieved by the cooperation between the first mounting groove and the second transmission block and the cooperation between the second mounting groove and the first transmission block. The transmission nut is spherical and is provided Inside the transmission sleeve, at least one second transmission block of the transmission sleeve is provided with a first through-hole along the radial direction of the transmission sleeve, the transmission nut is provided with an axial threaded hole, and is threadedly connected to the screw rod through the threaded hole, a radial mounting groove is provided on the transmission nut, the pin shaft passes through the first through-hole and is inserted into the mounting groove, the shell is installed on the vehicle door and is located near the vehicle door hinge, the vehicle body bracket is installed on the vehicle body, and the screw rod is rotatably connected to the vehicle body bracket, the drive assembly drives the drive wheel to rotate, thereby driving the transmission sleeve and the transmission nut to rotate, and then driving the screw rod to make a linear motion to drive the vehicle door to open or close.

[0008] Preferably, the shell includes an intermediate shell, a tail protective tube, and a mounting seat. The two sides of the intermediate shell are respectively provided with a first opening and a second opening along the axial direction of the screw rod. The tail protective tube is connected to the first opening side of the intermediate shell, and the mounting seat is connected to the second opening side of the intermediate shell. The first end of the screw rod is located in the tail protective tube, and the second end of the screw rod passes through the intermediate shell and the mounting seat in sequence and extends to the outside. The intermediate shell is also provided with a third opening, and the output end of the drive assembly extends into the internal cavity of the intermediate shell from the third opening.

[0009] Preferably, the worm wheel is arranged in the internal cavity of the intermediate housing, and a worm is provided on the output end of the drive assembly, and the worm is engaged with the worm wheel.

[0010] Preferably, the door drive mechanism also includes a positioning assembly, the positioning assembly includes a first positioning bearing, the end of the transmission sleeve is provided with a flange, the first positioning bearing is sleeved on the transmission sleeve, and the two sides of the inner ring of the first positioning bearing are respectively abutted against the second transmission block and the flange.

[0011] Preferably, the positioning assembly also includes a threaded tube, the outer surface of the threaded tube is provided with an external thread, the inner surface of the second opening of the intermediate shell is also provided with a threaded portion, the threaded portion is provided with an internal thread, the threaded tube and the threaded portion are connected by threads, and the intermediate shell is provided with a first positioning step, one side of the outer ring of the first positioning bearing is clamped on the first positioning step, and the other side is pressed by the threaded tube.

[0012] Preferably, the positioning assembly further includes a second positioning bearing, a second positioning step is provided in the intermediate housing, one side of the second positioning bearing is clamped on the second positioning step, and the other side abuts against an end of the second positioning block away from the first positioning bearing.

[0013] Preferably, the first end of the screw rod is provided with a screw rod washer and a locking nut, the screw rod washer is sleeved on the screw rod, and the locking nut is located outside the screw rod washer and is used to fix the screw rod washer, and the diameter of the screw rod washer is larger than the diameter of the inner hole of the transmission nut.

[0014] Preferably, a screw adapter is provided at the second end of the screw, the screw adapter is provided with a first connecting hole, a second connecting hole is provided on the vehicle body bracket, the first connecting hole is aligned with the second connecting hole, and are connected by a pin rivet.

[0015] Preferably, the vehicle door drive mechanism also includes a sealing assembly, which includes a first sealing ring, a second sealing ring, and a third sealing ring. The first sealing ring is arranged between the connecting surface of the intermediate shell and the tail guard tube, the second sealing ring is arranged between the connecting surface of the intermediate shell and the mounting seat, and the third sealing ring is arranged between the connecting surface of the intermediate shell and the drive motor.

[0016] Preferably, the sealing assembly also includes a bellows, which is sleeved on the screw rod along the axial direction of the screw rod, and a bellows groove is provided at the second end of the screw rod, one end of the bellows is installed in the bellows groove, and the other end is pressed between the mounting seat and the intermediate shell.

[0017] The door drive mechanism of this invention utilizes a screw-nut transmission method, effectively achieving door suspension in all operating conditions. Even under extreme operating conditions such as upward, downward, and side slopes, the door will not automatically fall or open. The mounting groove on the drive nut cooperates with the pin to enable the screw to swing in multiple directions during linear motion, ensuring that the rotation axis of the body bracket and the door hinge remain parallel at all times. This allows for screw adjustment and prevents door jamming during opening and closing.

[0018] Furthermore, compared to mechanical transmission limiters, the screw-nut structure eliminates the manual operating force required to switch between gears, resulting in less manual effort. Furthermore, compared to zipper, rack, hinge shaft, and parallel shaft systems, the screw-nut structure offers advantages such as simplicity, fewer parts, lower noise, and lower cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a structural schematic diagram of the door drive mechanism in Example 1 of the present invention;

[0020] Figure 2 is a first cross-sectional view of the door drive mechanism in embodiment 1 of the present invention;

[0021] Figure 3 is a second cross-sectional view of the door drive mechanism in embodiment 1 of the present invention;

[0022] Figure 4 This is an exploded view of a first embodiment of the driving wheel, transmission sleeve, transmission nut, and pin in Example 1 of the present invention;

[0023] Figure 5 This is an exploded view of a second embodiment of the driving wheel, the transmission sleeve, the transmission nut, and the pin in Example 1 of the present invention;

[0024] Figure 6 This is a schematic structural diagram of a first embodiment of the transmission sleeve in Example 1 of the present invention;

[0025] Figure 7 1 is a schematic structural diagram of a second embodiment of the transmission sleeve in Example 1 of the present invention;

[0026] Figure 8 yes Figure 2 A partial enlarged view of

[0027] Figure 9 is a schematic diagram of the three-dimensional structure of the intermediate housing in Example 1 of the present invention;

[0028] Figure 10 Schematic diagram of the connection between the transmission nut and the screw rod in Example 1 of the present invention.

[0029] In the figure: 100-screw, 110-transmission sleeve, 111-second transmission block, 112-second mounting groove, 113-first through-hole, 114-flanged edge, 120-transmission nut, 121-threaded hole, 122-mounting groove, 130-pin, 140-drive wheel, 141-first transmission block, 142-first mounting groove, 150-worm, 160-body bracket, 170-locking nut, 171-screw washer, 180-screw adapter, 181-bushing, 1 82-pin rivet, 200-intermediate housing, 210-tail guard tube, 220-mounting seat, 230-first opening, 240-second opening, 250-third opening, 260-drive assembly, 300-first locating bearing, 310-first locating step, 320-threaded tube, 330-second locating step, 340-second locating bearing, 400-first sealing ring, 410-second sealing ring, 420-third sealing ring, 500-bellows, 510-bellows groove. DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of the present invention.

[0031] In the description of the present invention, it should be noted that the term "upper" and the like to indicate an orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience and simplification of the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In the description of the present invention, the terms “first” and “second” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connect," "dispose," "install," "fix," etc. should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integral connection; they may refer to direct connection, indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0034] The present invention provides a vehicle door drive mechanism, comprising a drive assembly, a transmission assembly, a housing and a vehicle body bracket, wherein the transmission assembly is arranged in the housing and comprises a screw rod, a drive wheel, a transmission sleeve, a transmission nut and a pin shaft, wherein the output end of the drive assembly is connected to the drive wheel, a plurality of first transmission blocks are provided at intervals on the inner surface of the drive wheel, and a first mounting groove is formed between two adjacent first transmission blocks; a plurality of second transmission blocks are provided at intervals on the outer surface of the transmission sleeve, and a second mounting groove is formed between two adjacent second transmission blocks, and the connection between the drive wheel and the transmission sleeve is achieved by the cooperation between the first mounting groove and the second transmission block and the cooperation between the second mounting groove and the first transmission block, and the transmission nut is spherical. It is arranged inside the transmission sleeve, and the transmission sleeve has at least one second transmission block provided with a first through-hole along the radial direction of the transmission sleeve. The transmission nut is provided with an axial threaded hole and is threadedly connected to the screw rod through the threaded hole. A radial mounting groove is provided on the transmission nut, and the pin shaft passes through the first through-hole and is inserted into the mounting groove. The shell is installed on the vehicle door and is located near the vehicle door hinge. The vehicle body bracket is installed on the vehicle body, and the screw rod is rotatably connected to the vehicle body bracket. The drive assembly drives the drive wheel to rotate, thereby driving the transmission sleeve and the transmission nut to rotate, and then driving the screw rod to move linearly to drive the vehicle door to open or close.

[0035] Example 1

[0036] like Figure 1-10 As shown, this embodiment discloses a vehicle door drive mechanism, comprising a drive assembly 260, a transmission assembly, a housing, and a vehicle body bracket 160. The transmission assembly is disposed within the housing and includes a screw 100, a drive wheel 140, a transmission sleeve 110, a drive nut 120, and a pin 130. Drive assembly 260 utilizes a drive motor, the output end of which is connected to drive wheel 140 for rotating. In this embodiment, drive wheel 140 utilizes a worm gear.

[0037] like Figure 4 As shown, further, the inner surface of the driving wheel 140 is provided with a plurality of first transmission blocks 141 at intervals, and a first mounting groove 142 is formed between two adjacent first transmission blocks 141. The outer surface of the transmission sleeve 110 is provided with a plurality of second transmission blocks 111 at intervals, and a second mounting groove 112 is formed between two adjacent second transmission blocks 111. The connection between the driving wheel 140 and the transmission sleeve 110 is achieved through the cooperation between the first mounting groove 142 and the second mounting block, and the cooperation between the second mounting groove 112 and the first mounting block (the first transmission block 141 is inserted into the corresponding second mounting groove 112, and the second transmission block 111 is inserted into the corresponding first mounting groove 142).

[0038] The transmission nut 120 is spherical and is disposed inside the transmission sleeve 110 . The interior of the transmission sleeve 110 is spherical and socket-shaped. At least one second mounting block of the transmission sleeve 110 is provided with a first through hole 113 along the radial direction of the transmission sleeve 110 .

[0039] like Figure 4 As shown, in this embodiment, the transmission sleeve 110 is provided with two first through-holes 113, and the two first through-holes 113 are arranged on two second transmission blocks 111 symmetrically about the central axis of the transmission sleeve 110. The transmission nut 120 is provided with an axially extending threaded hole 121 and is threadedly connected to the screw rod 100 through the threaded hole 121. The transmission nut 120 is provided with radial mounting grooves 122, and there are two mounting grooves 122. The two mounting grooves 122 are symmetrically arranged on the side wall of the transmission nut 120, and the axes of the two mounting grooves 122 are perpendicular to the axis of the threaded hole 121.

[0040] like Figure 10 As shown, two pin shafts 130 are provided accordingly. The two pin shafts 130 pass through the two first through-holes 113 respectively and are inserted into the mounting grooves 122 on both sides of the driving nut 120 .

[0041] like Figure 1 、 2 As shown, the shell is installed on the vehicle door and is located near the door hinge. The body bracket 160 is installed on the vehicle body, and the screw rod 100 is rotatably connected to the body bracket 160. The drive assembly 260 drives the drive wheel 140 to rotate, thereby driving the transmission sleeve 110 and the transmission nut 120 to rotate, and then drives the screw rod 100 to move linearly to drive the vehicle door to open or close.

[0042] like Figure 2 As shown, the drive assembly 260 drives the worm wheel to rotate through the worm 150, thereby driving the transmission sleeve 110 and the transmission nut 120 to rotate. Since the transmission nut 120 is threadedly connected to the screw rod 100, it drives the screw rod 100 to move linearly.

[0043] When the car door is opened, the drive assembly 260 drives the screw rod 100 to move linearly to the right, thereby increasing the length of the screw rod 100 between the shell and the body bracket 160, thereby pushing the car door outward. Since the car door rotates around the hinge with the car body, during the process of opening the car door, the screw rod 100 and the body bracket 160 will rotate around their connection point.

[0044] The traditional screw-nut structure cannot swing, and due to a certain installation deviation between the car door and the door drive mechanism, the rotation axis of the rotation point of the screw 100 and the body bracket 160 cannot remain parallel to the axis of the door hinge, causing the car door to get stuck during the opening and closing process, and thus unable to open and close the door normally.

[0045] like Figure 10 As shown, the drive nut 120 is threadedly connected to the screw rod 100 through the threaded hole 121, and an elliptical mounting groove 122 is provided on the upper and lower sides. When the drive nut 120 rotates, it will drive the screw rod 100 to perform linear motion along the axial direction of the threaded hole 121. Due to the structural design of the pin 130 and the mounting groove 122, when the screw rod 100 performs linear motion, the screw rod 100 and the drive nut 120 can rotate synchronously in two directions. The first direction is a rotation at a certain angle with the central axis of the pin 130 as the center (swinging in the horizontal plane), and the other direction is a rotation along the length direction of the mounting groove 122 (swinging in the vertical plane), that is, the pin 130 moves from one side of the mounting groove 122 to the other side. This structural design allows the screw rod 100 to swing at a certain angle, while the external pin 130, transmission sleeve 110, and drive wheel 140 do not swing, thereby aligning the screw rod 100, allowing it to swing as the door opens and closes. When there is a certain installation deviation between the door and the door drive mechanism, the installation deviation can be eliminated by the swing of the screw rod, thereby keeping the rotation axis of the rotation point of the screw rod 100 and the body bracket 160 parallel to the axis of the door hinge, thereby ensuring that the door can be opened and closed smoothly. This structure helps to reduce the installation accuracy requirements of the door drive mechanism, the door, and the body. Even if there is a certain installation deviation, the door can still be opened and closed smoothly.

[0046] In addition, the pin shaft 130 also has the function of transmitting torque, so that the driving wheel 140 can drive the driving nut 120 to rotate.

[0047] like Figure 9 As shown, the housing includes an intermediate housing 200, a tail protection tube 210, and a mounting seat 220. A first opening 230 and a second opening 240 are respectively provided on both sides of the intermediate housing 200 along the axial direction of the screw rod 100. The tail protection tube 210 is connected to the first opening 230 side of the intermediate housing 200, and the mounting seat 220 is connected to the second opening 240 side of the intermediate housing 200. The first end of the screw rod 100 is located in the tail protection tube 210, and the second end of the screw rod 100 passes through the intermediate housing 200 and the mounting seat 220 in sequence and extends to the outside. The intermediate housing 200 also has a third opening 250, which is located on the side wall of the intermediate housing 200. The output end of the drive motor extends from the third opening 250 into the internal cavity of the intermediate housing 200.

[0048] like Figure 3 As shown, the worm gear is arranged in the inner cavity of the intermediate housing 200, and a worm 150 is provided on the output end of the driving motor, and the worm 150 is engaged with the worm gear.

[0049] like Figure 2 、 4 As shown in Figure 8, the door drive mechanism also includes a positioning assembly, which includes a first positioning bearing 300. The end of the transmission sleeve 110 is provided with a flange 114. The first positioning bearing 300 is sleeved on the transmission sleeve 110, and the two sides of the inner ring of the first positioning bearing 300 are respectively in contact with the second transmission block 111 and the flange 114, thereby limiting the position between the second transmission block 111 and the flange 114.

[0050] like Figure 8 As shown, further, the positioning assembly also includes a threaded tube 320, the outer surface of the threaded tube 320 is provided with an external thread, the inner surface of the second opening 240 of the intermediate shell 200 is also provided with a threaded portion, the threaded portion is provided with an internal thread, the threaded tube 320 and the threaded portion are connected by threads, and the intermediate shell 200 is provided with a first positioning step 310, one side of the outer ring of the first positioning bearing 300 is clamped on the first positioning step 310, and the other side is tightened by the threaded tube 320, that is, the first positioning bearing 300 is limited by the first positioning step 310 and the threaded tube 320, so that the first positioning bearing 300 is fixed in the intermediate shell 200, and then the positioning sleeve is limited by the first positioning bearing 300.

[0051] like Figure 8 As shown, the positioning assembly also includes a second positioning bearing 340, which is located on the side of the intermediate housing 200 close to the tail protective tube 210. A second positioning step 330 is provided in the intermediate housing 200. One side of the second positioning bearing 340 is clamped on the second positioning step 330, and the other side is abutted against the end of the second positioning block away from the first positioning bearing 300, that is, the second positioning bearing 340 is limited by the second positioning step 330 and the second positioning block to assist in positioning the transmission sleeve 110.

[0052] In this embodiment, the first locating bearing 300 and the second locating bearing 340 hold the locating sleeve in a fixed position within the intermediate housing 200. The locating sleeve can only rotate with the drive wheel 140, but cannot move linearly. Furthermore, the ends of the worm gear abut against the first locating bearing 300 and the second locating bearing 340, respectively.

[0053] In this embodiment, there are two first through-holes 113 and two pins 130. The two through-holes are respectively arranged on two second transmission blocks 111 symmetrically along the central axis of the transmission sleeve 110, and two mounting grooves 122 are provided on the transmission nut 120 located inside the transmission sleeve 110. The two mounting grooves 122 are respectively aligned with the two first through-holes 113. The pin 130 is inserted from the first through-hole 113 outside the transmission sleeve 110, and its head end is inserted into the mounting groove 122 of the transmission nut 120, and its tail end is flush with the outer surface of the second transmission block 111, thereby abutting against the inner surface of the first mounting groove 142 of the drive wheel 140. The drive wheel 140 presses the pin 130 so that the pin 130 will not move along the diameter direction of the drive wheel 140.

[0054] like Figure 4 As shown, both end surfaces of the threaded hole 121 of the drive nut 120 are planes, and the other parts of the outer surface of the drive nut 120 are spherical. The shape of the mounting groove 122 is elliptical, and the width of the mounting groove 122 is adapted to the diameter of the pin shaft 130, so that the pin shaft 130 can be clamped in the mounting groove 122, and the lower end of the pin shaft 130 does not contact the screw rod 100.

[0055] like Figure 4 As shown, the interior of the transmission sleeve 110 is in the shape of a ball socket, and the openings on both sides of the transmission sleeve 110 are inward-retracted structures, and the diameter of the opening is smaller than the maximum diameter of the transmission nut 120, so that the transmission nut 120 is always located inside the transmission sleeve 110 and will not fall out of the transmission sleeve 110.

[0056] like Figure 5 As shown, as another embodiment, the two side surfaces of the opening on one side of the transmission sleeve 110 are planar structures that match the two end surfaces of the threaded hole 121 of the transmission nut 120, and the remaining portion is a spherical structure that matches the spherical surface of the transmission nut 120. When the transmission nut 120 is rotated to a specific angle, the shape of the opening of the transmission sleeve 110 coincides with the shape of the transmission thread, so that the transmission nut 120 can be inserted into the transmission sleeve 110 through the opening. The transmission nut 120 is then rotated until the mounting groove 122 is aligned with the first through-hole 113 on the transmission sleeve 110, and the pin 130 is then inserted. At this point, the transmission nut 120 cannot fall out of the opening of the transmission sleeve 110.

[0057] like Figure 2 As shown, the diameters of the first end and the second end of the screw rod 100 are both smaller than the diameter of the middle section of the screw rod 100 , so that the two ends thereof form a stepped structure.

[0058] A screw washer 171 and a lock nut 170 are provided at the first end of the screw rod 100. The screw washer 171 is sleeved over the first end of the screw rod 100, and the lock nut 170 is located outside the screw washer 171 and is used to secure the screw washer 171. The diameter of the screw washer 171 is larger than the diameter of the inner hole of the drive nut 120. When the screw rod 100 moves rightward until the screw washer 171 contacts the threaded hole 121 of the drive nut 120, the screw rod 100 reaches its maximum movement distance because the screw washer 171 cannot pass through the threaded hole 121. The door is in the extreme open position.

[0059] Furthermore, a screw adapter 180 is provided at the second end of the screw rod 100. One end of the screw adapter 180 is threadedly connected to the second end of the screw rod 100, and the other end of the screw adapter 180 is provided with a first connecting hole. The vehicle body bracket 160 is provided with a second connecting hole. The first connecting hole and the second connecting hole are aligned and connected by a pin rivet 182. When the vehicle door is opened or closed, the screw rod 100 and the vehicle body bracket 160 rotate about the pin rivet 182.

[0060] Furthermore, a bushing 181 is provided in the first connecting hole.

[0061] like Figure 2 、 3 As shown in Figures 8 and 9, the door drive mechanism optionally further includes a sealing assembly comprising a first sealing ring 400, a second sealing ring 410, and a third sealing ring 420. The first sealing ring 400 is disposed between the connecting surface of the intermediate housing 200 and the tail protection tube 210, the second sealing ring 410 is disposed between the connecting surface of the intermediate housing 200 and the mounting base 220, and the third sealing ring 420 is disposed between the connecting surface of the intermediate housing 200 and the drive motor. The sealing assembly is used to enhance the sealing performance of the door drive mechanism.

[0062] like Figure 2 、 8 As shown, further, the sealing assembly also includes a bellows 500, which is sleeved on the screw rod 100 along the axial direction of the screw rod 100, and a bellows groove 510 is provided at the second end of the screw rod 100. One end of the bellows 500 is installed in the bellows groove 510, and the other end is pressed between the mounting seat 220 and the intermediate shell 200 to further increase the sealing performance of the vehicle door drive mechanism.

[0063] The door drive mechanism of the present invention adopts a screw-nut transmission method, which can effectively realize the door suspension in all working conditions. Even under extreme working conditions such as up / down / side slope, the door will not automatically fall or open. The cooperation between the mounting groove 122 on the transmission nut 120 and the pin 130 can realize the swing of the screw 100 in multiple directions during the linear motion, ensuring that the rotation axis of the body bracket 160 and the rotation axis of the door hinge are always parallel, realizing the centering of the screw 100 and avoiding the door from getting stuck when opening and closing the door. In addition, compared with the mechanical limiter of the transmission, the screw-nut structure does not have the manual operating force change when switching between gears, and the manual force is light. Moreover, compared with the zipper / rack / hinge shaft / parallel axis structure, the screw-nut structure has the advantages of simple structure, fewer parts, low noise and low cost.

[0064] It will be understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will appreciate that various modifications and improvements can be made without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A door drive mechanism, characterized in that: It comprises a driving assembly (260), a transmission assembly, a housing and a vehicle body support (160), The transmission assembly is arranged in the housing and comprises a screw rod (100), a driving wheel (140), a transmission sleeve (110), a transmission nut (120), and a pin (130). The output end of the driving assembly (260) is connected to the driving wheel (140); a plurality of first transmission blocks (141) are arranged at intervals on the inner surface of the driving wheel (140); a first mounting groove (142) is provided between two adjacent first transmission blocks (141); a plurality of second transmission blocks (111) are arranged at intervals on the outer surface of the transmission sleeve (110); a second mounting groove (112) is provided between two adjacent second transmission blocks (111); the driving wheel (140) and the transmission sleeve (110) are connected by the cooperation between the first mounting groove (142) and the second transmission block (111) and the cooperation between the second mounting groove (112) and the first transmission block (141); the transmission nut (120) is spherical and is arranged inside the transmission sleeve (110); The transmission sleeve (110) has at least one second transmission block (111) provided with a first through hole (113) along the radial direction of the transmission sleeve (110); the transmission nut (120) is provided with an axial threaded hole (121) and is threadedly connected to the screw rod (100) through the threaded hole (121); the transmission nut (120) is provided with a radial mounting groove (122); the pin shaft (130) passes through the first through hole (113) and is inserted into the mounting groove (122); The housing is mounted on a vehicle door and is located near a door hinge. The vehicle body bracket (160) is mounted on the vehicle body, and the screw rod (100) is rotatably connected to the vehicle body bracket (160). The driving assembly (260) drives the driving wheel (140) to rotate, thereby driving the transmission sleeve (110) and the transmission nut (120) to rotate, and further driving the screw rod (100) to perform linear motion, so as to drive the vehicle door to open or close.

2. The door drive mechanism according to claim 1, characterized in that: The housing comprises an intermediate housing (200), a tail protection tube (210), and a mounting seat (220). A first opening (230) and a second opening (240) are respectively provided on both sides of the intermediate housing (200) along the axial direction of the screw rod (100); the tail protection tube (210) is connected to the first opening (230) side of the intermediate housing (200); the mounting seat (220) is connected to the second opening (240) side of the intermediate housing (200); the first end of the screw rod (100) is located in the tail protection tube (210); the second end of the screw rod (100) passes through the intermediate housing (200) and the mounting seat (220) in sequence and then extends to the outside. The intermediate housing (200) is also provided with a third opening (250), and the output end of the drive assembly (260) extends from the third opening (250) into the internal cavity of the intermediate housing (200).

3. The door drive mechanism according to claim 2, characterized in that: The worm wheel is arranged in the internal cavity of the intermediate housing (200), and a worm (150) is arranged on the output end of the driving assembly (260), and the worm (150) is meshed with the worm wheel.

4. The door drive mechanism according to claim 3, characterized in that: The invention also comprises a positioning assembly, wherein the positioning assembly comprises a first positioning bearing (300), the end of the transmission sleeve (110) is provided with a flange (114), the first positioning bearing (300) is sleeved on the transmission sleeve (110), and the two sides of the inner ring of the first positioning bearing (300) are respectively in contact with the second transmission block (111) and the flange (114).

5. The door drive mechanism according to claim 4, characterized in that: The positioning assembly further comprises a threaded tube (320), the outer surface of the threaded tube (320) being provided with external threads. The inner surface of the second opening (240) of the intermediate housing (200) is further provided with a threaded portion, the threaded portion being provided with an internal thread, and the threaded tube (320) is connected to the threaded portion via threads. Furthermore, the intermediate housing (200) is provided with a first positioning step (310), one side of the outer ring of the first positioning bearing (300) is clamped on the first positioning step (310), and the other side is pressed by the threaded tube (320).

6. The door driving mechanism according to claim 5, characterized in that: The positioning assembly further includes a second positioning bearing (340), A second positioning step (330) is provided in the intermediate housing (200); one side of the second positioning bearing (340) is clamped on the second positioning step (330), and the other side is in contact with an end of the second positioning block away from the first positioning bearing (300).

7. The door drive mechanism according to claim 2, characterized in that: A screw washer (171) and a locking nut (170) are provided at the first end of the screw rod (100); the screw washer (171) is sleeved on the screw rod (100); the locking nut (170) is located outside the screw washer (171) and is used to fix the screw washer (171). The diameter of the screw rod gasket (171) is greater than the diameter of the inner hole of the transmission nut (120).

8. The door driving mechanism according to claim 2, characterized in that: The second end of the screw rod (100) is provided with a screw rod adapter (180), the screw rod adapter (180) is provided with a first connection hole, the vehicle body bracket (160) is provided with a second connection hole, the first connection hole is aligned with the second connection hole, and the first connection hole is connected via a pin rivet (182).

9. The door driving mechanism according to claim 2, characterized in that: It also includes a sealing assembly, which includes a first sealing ring (400), a second sealing ring (410), and a third sealing ring (420). The first sealing ring (400) is arranged between the connection surfaces of the intermediate housing (200) and the tail protection tube (210), the second sealing ring (410) is arranged between the connection surfaces of the intermediate housing (200) and the mounting seat (220), and the third sealing ring (420) is arranged between the connection surfaces of the intermediate housing (200) and the drive motor.

10. The door driving mechanism according to claim 9, characterized in that: The sealing assembly further comprises a bellows (500), wherein the bellows (500) is sleeved on the screw rod (100) along the axial direction of the screw rod (100), and a bellows groove (510) is provided at the second end of the screw rod (100), one end of the bellows (500) is installed in the bellows groove (510), and the other end is pressed between the mounting seat (220) and the intermediate housing (200).

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