Differential drive assembly and automobile swing door including the same

Abstract

The present invention relates to a vehicle door system, specifically a differential drive assembly and a swing door of an automobile comprising the same. The automobile has a door that is pivotally and swingably connected to the vehicle body, and the door can move along a swinging path between an open position and a closed position. The differential drive assembly includes a power-operated driver connected to the door. The differential drive assembly is configured to respond to the power-operated instruction and utilize a guide track to achieve a compound rotational motion of the door's revolution and rotation. The differential drive assembly can not only achieve reliable transmission, but also eliminate the risk of the door's complex movement posture causing the transmission system to become stuck.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, in particular to an automatic swing door for an automobile and a differential drive component for driving the automatic swing door. Background Art

[0002] With the continuous development and progress of the automotive industry, the usage rate and demand for cars are constantly increasing. Therefore, the convenience of car use is becoming increasingly important to everyone. There are many ways to open a car's side doors, such as the straight-opening door, which is the most common door opening method. The door opens outward in the same direction as the car's movement. This design is simple and convenient, and uses airflow pressure to help close the door while the car is in motion. Side sliding doors: These doors slide along the side of the car body when opened, rather than folding outward. Side sliding doors are commonly used in MPV models because they occupy a small space when open, making it easier for passengers to get on and off the vehicle and for loading and unloading items. Double doors: Commonly found on luxury cars, the rear doors open in the same way as the front doors, but in the opposite direction. This design can provide a more elegant experience of getting on and off the vehicle, and gives people a visually noble feeling; swing door: usually refers to the way the door swings outward to open through specific hinges and drive mechanisms. This design is used in many models, especially in some luxury models or vehicles with special designs. At present, electric swing doors have appeared on new energy vehicles. They can be controlled by buttons, automatically swing outward to open, and automatically close when closed. They take up little space, but the cost is relatively high, and due to the complexity of the drive system, the reliability is low. Summary of the Invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a differential drive assembly, which can not only achieve reliable transmission, but also eliminate the risk of jamming of the transmission system due to the complex movement posture of the vehicle door.

[0004] The present invention provides a differential drive assembly comprising: a driver, the driver comprising a motor and a driver output shaft driven by the motor; a differential housing assembly comprising an upper differential housing and a lower differential housing and a mounting cavity formed therebetween, the lower differential housing having a lower shaft sleeve; a differential assembly comprising an upper half-shaft gear, a planetary gear, a lower half-shaft gear and a differential output shaft in sequence; the driver output shaft is transmission-connected to the upper half-shaft gear; the planetary gear is mounted in the differential housing assembly through a planetary gear shaft and meshes with the upper half-shaft gear and the lower half-shaft gear; the differential output shaft is located in the lower shaft sleeve of the lower differential housing The lower arm assembly includes a lower arm sleeve and a rack fixedly arranged in the lower arm sleeve; the lower arm assembly also includes a bushing, the insertion end of the bushing is slidably located in the lower arm sleeve, and the rotating end is rotatably mounted on the mounting frame, wherein the differential output shaft extends into the bushing and is in transmission engagement with the rack, and the lower shaft sleeve of the lower differential shell is in transmission engagement with the bushing; the positional relationship between the lower arm sleeve and the bushing is adjusted by changing the positional relationship between the differential output shaft and the rack. During the adjustment process, the lower arm sleeve moves relative to the mounting frame and is limited by the guide track, and the bushing rotates relative to the mounting frame.

[0005] Preferably, the mounting frame further comprises a body, the body comprising an upper mounting plate, a side plate and a lower mounting plate, the guide rails being an upper guide rail on the upper mounting plate and a lower guide rail on the lower mounting plate.

[0006] Preferably, the bushing is a sleeve structure, and a convex edge is provided above the rotating end of the sleeve structure. The convex edge can be rotatably positioned in the mounting hole of the upper mounting plate, and a transmission tooth or a transmission key is provided on the inner side of the convex edge to cooperate with the lower shaft sleeve of the lower housing of the differential; the rack enters from the insertion end of the sleeve structure and is connected to the differential output shaft at the rotating end.

[0007] Preferably, the lower arm sleeve is provided with rollers on the upper and lower sides, and the upper and lower rollers are respectively located in the upper and lower guide rails. The differential housing assembly also includes an upper cover and a lower cover; the upper differential housing is mounted in the upper cover via an upper bearing, and the lower shaft sleeve of the lower differential housing is mounted in the lower cover via a lower shaft sleeve.

[0008] Preferably, the upper half-shaft gear and the lower half-shaft gear of the differential assembly are bevel gears, and the planetary gears are bevel gears and there are at least two of them, which are installed between the upper half-shaft gear and the lower half-shaft gear through the planetary gear shaft. When the upper half-shaft gear and the lower half-shaft gear rotate at the same speed, the planetary gears rotate on their own; when the upper half-shaft gear and the lower half-shaft gear rotate differentially, the planetary gears perform a combined motion of revolution and rotation.

[0009] The automobile swing door includes a door body and uses the aforementioned differential drive assembly. The lower swing arm assembly of the differential drive assembly is hinged to the vehicle body, and the mounting frame of the lower swing arm assembly is fixed to the door body. The differential drive assembly drives the rack to perform linear reciprocating motion, thereby driving the lower swing arm sleeve to move relative to the mounting frame and be guided to the track limit constraint, so that the door body opens and closes in an outward swinging form.

[0010] It also includes an upper swing arm assembly; the upper swing arm body of the upper swing arm assembly is hinged to the vehicle body and the vehicle door through a first mounting block and a second mounting block respectively.

[0011] The beneficial effects of the above technical solution are:

[0012] In the present invention, the operating trajectory of the electric swing door is defined by the upper and lower swing arm assemblies. Because the lower swing arm assembly can extend to a variable length within the constraints of the mounting frame's guide rails, the electric swing door exhibits complex rotational postures during movement. This application proposes a differential drive assembly to eliminate the effects of the differential speed between the driver output shaft and the differential output shaft on the door's movement. The planetary gears, while simultaneously rotating on their own axis—revolving around the driver output shaft—result in a planetary gear rotation. The upper and lower half-shaft gears rotate at different speeds. This eliminates the risk of rack motion jamming.

[0013] Other beneficial effects of the present invention will be described one by one in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of an automatic swing door for a car according to an embodiment of the present invention;

[0015] Figure 2 This is a working state diagram of the differential drive assembly of the automatic swing door of a vehicle according to an embodiment of the present invention during the opening process;

[0016] Figure 3 This is a schematic structural diagram of the vehicle body and the swing door when the automatic swing door of the vehicle is opened, viewed from above;

[0017] Figure 4 This is a schematic diagram of the overall assembly of a differential drive assembly according to an embodiment of the present invention;

[0018] Figure 5 A partial cross-sectional schematic diagram of a differential drive assembly according to an embodiment of the present invention;

[0019] Figure 6 This is a first exploded view of the differential drive assembly according to an embodiment of the present invention;

[0020] Figure 7 This is a second exploded view of the differential drive assembly according to an embodiment of the present invention.

[0021] In the figure: 10 driver; 11 motor; 12 driver output shaft; 20 differential assembly; 21 upper half-shaft gear; 22 lower half-shaft gear; 23 planetary gear; 24 planetary gear shaft; 25 upper gear segment; 26 output shaft; 27 drive wheel mounting position; 28 drive wheel; 30 differential housing assembly; 31 upper bearing; 32 differential upper housing; 33 differential lower housing; 34 upper cover; 35 lower cover; 36 lower bearing; 37 lower bushing; 40 mounting frame; 41 body; 42 mounting hole; 43 upper guide rail; 44 lower guide rail; 50 lower swing arm assembly; 51 bushing; 52 rack; 53 fixing block; 54 lower swing arm sleeve; 55 roller; 56 lower rotating shaft; 60 upper swing arm assembly; 61 upper swing arm body; 62 first mounting block; 63 second mounting block. DETAILED DESCRIPTION

[0022] The above and other technical features and effects of the present invention are described below with reference to the attached Figures 1 to 7 The embodiments are described in detail.

[0023] Vehicles and electric swing doors

[0024] like Figure 1 As shown, an example is given of the body part of the car involving the doors, including a front rear passenger door installed on the body through an upper swing arm assembly 60 and a lower swing arm assembly 50, thereby forming a swing arm hinge structure, and the drive device of the electric swing door is integrated on the rear passenger door.

[0025] according to Figure 1 and Figure 2 The swing door comprises inner and outer metal plates and a defined inner cavity, within which the electric swing door drive device can be mounted. When operating between the open and closed positions, the electric swing door swings outward from the vehicle body. Its trajectory is defined by the upper swing arm assembly 60 and the lower swing arm assembly 50. Because the lower swing arm assembly 50 is constrained by the guide rails of the mounting bracket 40 and has a variable extension length, the electric swing door exhibits complex rotational gestures during movement. For example, the forward movement of the composite door body allows the door to rotate forward and insert into the gap between the front door and the vehicle body, completing the closing of the passenger door. This allows the door to avoid seals and other structural components on the vehicle body when opening and closing.

[0026] At the near end of the vehicle body, the upper and lower arm assemblies 60 and 50 are pivotally mounted on the vehicle body, for example, connected to the A-pillar and / or B-pillar via mounting brackets. At this point, the upper and lower arm assemblies 60 and 50 extend horizontally or substantially horizontally in a cantilevered manner (meaning extending transversely or substantially transversely relative to a vertical axis, with substantially transverse meaning that the bracket is slightly tilted relative to the vertical axis, for example, by 5 degrees or an angle considered to be within the expected range). A second, free, unsupported end, also referred to as a distal end, away from the vehicle body, the upper and lower arm assemblies 60 and 50 exemplarily extend through a port provided on the closing surface of the door body, connecting the inner and outer metal panels.

[0027] The driver 10 serves as the power source for the electric swing door and is communicatively connected to the vehicle control unit. The driver 10 is not an inventive contribution of the present invention. For example, it is optional but not limited to the applicant's prior application 2024202178686, a door driver and a vehicle, which respond to the selective actuation of the control unit and the rotation direction of the motor. The structure of the automatic swing door driver 10 does not need to be modified because the purpose of the invention of this application is to use a differential structure to solve the problem of rack jamming during complex door movements, rather than to have the driver 10 output a variable frequency. Conventional drivers can be directly incorporated into existing swing door structures without requiring significant design changes and cost, especially door structures that were originally designed for doors with purely mechanical rack and pinion systems.

[0028] The driver 10 controls the reciprocating linear motion of the rack 52, rotates the upper swing arm assembly 60 and the lower swing arm assembly 50, and opens the vehicle door in a first direction, that is, moves in the opening direction from the closed position to the open position. Conversely, in a second direction, the driver moves the vehicle door in the closing direction from the open position to the closed position.

[0029] Differential drive components

[0030] As mentioned above, the running trajectory of the electric swing door is defined by the upper swing arm assembly and the lower swing arm assembly. Since the extension length of the lower swing arm assembly is variable under the constraint of the guide track of the mounting frame, the electric swing door presents a complex rotation posture during movement.

[0031] Explained from another perspective, during the movement of the electric swing door, it not only has circumferential rotation, but also has radial movement or its own rotation, which is achieved by the roller 55 of the lower swing arm assembly 50 moving in the guide rail of the complex curve. If the differential drive assembly is not provided, the continuous constant speed rotation output by the driver 10 causes the roller 55 to be stuck when running in the guide rail of the complex curve, or the roller 55 cannot move normally in the guide rail of the complex curve.

[0032] In this regard, the present application proposes a differential drive assembly for eliminating the influence of the differential speed between the driver output shaft 12 and the differential output shaft 26 on the door movement. Figure 5-7 This is a specific application of the differential structure in the prior art to vehicle door drive. Specifically, the differential drive assembly includes a driver 10, which includes a motor and a driver output shaft 12 driven by the motor; a differential housing assembly 30, which includes an upper differential housing 32 and a lower differential housing 33, and a mounting cavity formed therebetween. The lower differential housing 33 has a lower shaft sleeve; a differential assembly 20, which includes an upper side gear 21, planetary gears 23, a lower side gear 22, and a differential output shaft 26. The driver output shaft 12 is in driving connection with the upper side gear 21; the planetary gears 23 are mounted in the differential housing assembly 30 via planetary gear shafts 24 and mesh with the upper side gear 21 and the lower side gear 22; the differential output shaft 26 is located in the lower shaft sleeve of the lower differential housing 33. The mounting frame 40 is provided with a guide rail; the lower arm assembly 50 includes a lower arm sleeve 54 and a rack 52 fixedly arranged in the lower arm sleeve 54; it also includes a bushing 51, the insertion end of the bushing 51 is slidably located in the lower arm sleeve 54, and the rotating end is rotatably mounted on the mounting frame 40, wherein the differential output shaft 26 extends into the bushing 51 and is transmission-engaged with the rack 52, and the lower shaft sleeve of the differential lower shell 33 is transmission-engaged with the bushing 51; the positional relationship between the lower arm sleeve 54 and the bushing 51 is adjusted by changing the positional relationship between the differential output shaft 26 and the rack 52. During the adjustment process, the lower arm sleeve 54 moves relative to the mounting frame 40 and is limited by the guide rail, and the bushing 51 rotates relative to the mounting frame 40.

[0033] Preferably, the mounting frame 40 further includes a body 41, which comprises an upper mounting plate, side plates, and a lower mounting plate. The guide rails are an upper guide rail 43 on the upper mounting plate and a lower guide rail 44 on the lower mounting plate. The bushing 51 is a sleeve structure having a flange above the rotating end of the sleeve structure, which is rotatably positioned within the mounting hole 42 of the upper mounting plate. The inner side of the flange has a transmission tooth or key that drives with the lower shaft sleeve of the differential lower housing 33. The rack 52 extends from the insertion end of the sleeve structure and is drivingly connected to the differential output shaft 26 at the rotating end. The lower arm sleeve 54 is provided with upper and lower rollers 55, respectively located within the upper guide rail 43 and lower guide rail 44, to facilitate movement between the lower arm sleeve and the mounting frame 40.

[0034] Differential drive execution

[0035] In the prior art, both side gears are driven by the drive shaft to output power, for example, to eliminate wheel speed differences between the drive axles of a vehicle. However, unlike the prior art, this embodiment utilizes a symmetrical bevel gear differential in mechanical design. In this implementation, the driver output shaft 12 serves as the power input element of the differential drive assembly, while the differential output shaft 26 serves as the power output element. The speed difference between the driver output shaft 12 and the differential output shaft 26 is ultimately transmitted upward by the lower bushing 37 to the planetary gear shaft 24, thereby causing the planetary gears 23 to rotate and revolve, thereby eliminating the speed difference.

[0036] The upper half-shaft gear 21 and the lower half-shaft gear 22 of the differential assembly 20 are bevel gears, and the planetary gears 23 are bevel gears and there are at least two of them. They are installed between the upper half-shaft gear 21 and the lower half-shaft gear 22 through the planetary gear shaft 24. When the upper half-shaft gear 21 and the lower half-shaft gear 22 rotate at the same speed, the planetary gears 23 rotate on their own speed; when the upper half-shaft gear 21 and the lower half-shaft gear 22 rotate at a differential speed, the planetary gears 23 perform a combined motion of revolution and rotation.

[0037] In this embodiment, the differential case consists of an upper differential case 32 and a lower differential case 33, which are bolted together. When assembled, a spur-bevel planetary gear 23 is mounted on each of the two journals of the planetary gear shaft 24. These gears mesh with upper and lower spur-bevel side gears. The upper side gear 21 is splined to the driver output shaft 12, while the lower side gear 22 is splined to the differential output shaft 26. The driver output shaft 12 and the differential output shaft 26 are supported in corresponding upper and lower housings in the differential case.

[0038] After passing through the speed reducer, the power from the driver 10 is output from the driver output shaft 12 to the rack 52 through the upper half shaft gear 21, the planetary gear 23, the lower half shaft gear 22, the differential output shaft 26, and the drive wheel 28 in sequence.

[0039] Differential drive transmission line

[0040] When the driver output shaft 12 and the differential output shaft 26 rotate at the same speed, the planetary gears rotate around their own axes - rotation. That is, a balanced state is formed among the driver output shaft 12, the planetary gears 23 and the differential output shaft 26.

[0041] Because the lower arm sleeve 54 is fixedly connected to the rack 52, if the lower arm sleeve 54 becomes stuck along the guide rail, the rack 52 will also become stuck. This creates a differential between the driver output shaft 12 and the differential output shaft 26. The bushing 51, via the spline, drives the lower sleeve 37, which in turn drives the differential case. The differential case is fixedly connected to the planetary gear shafts 24. Therefore, while the planetary gears rotate, they also rotate around the axis of the driver output shaft 12—revolution. The upper and lower half-shaft gears rotate at different speeds. This eliminates the risk of the rack 52 becoming stuck.

[0042] Fixing of differential drive components in door systems

[0043] The differential housing assembly 30 further includes an upper housing 34 and a lower housing 35. The upper differential housing 32 is mounted within the upper housing 34 via an upper bearing 31, and the lower bushing of the lower differential housing 33 is mounted within the lower housing 35 via a lower bushing 37. In this system, the upper housing 34 and the lower housing 35 are external housings that are stationary and can therefore be fixed between the driver 10 and the mounting bracket 40.

[0044] The differential case is composed of a differential upper case 32 and a differential lower case 33 that are fastened with bolts. It keeps stationary and rotates accordingly according to the state of the same speed and the differential.

[0045] The door body of the automobile swing door uses a differential drive assembly. During installation, the lower swing arm assembly 50 of the differential drive assembly is hinged to the car body, and the mounting frame 40 of the lower swing arm assembly 50 is fixed on the door body. The differential drive assembly drives the rack to make a linear reciprocating motion, thereby driving the lower swing arm sleeve 54 to move relative to the mounting frame 40 and be guided to the track limit constraint, and the door body opens and closes in the form of swinging outward.

[0046] A car's body consists of the A-pillar, B-pillar, and C-pillar. These three pillars are crucial components of the vehicle's structure, each playing a crucial role in protecting occupant safety and maintaining vehicle stability. The A-pillars are the pillars on either side of the front windshield, located between the engine compartment and the passenger compartment. They primarily connect the roof to the vehicle's body and bear the brunt of a head-on collision, preventing the wheels and suspension from intruding into the passenger compartment. The quality of the A-pillars is crucial for protecting the driver and front passenger. The B-pillar, located between the front and rear seats, connects the front and rear doors. It not only connects the roof to the chassis but also acts as a bridge in side impacts, protecting occupants from injury. The quality of the B-pillar directly impacts the vehicle's safety performance in side impacts. The C-pillar, located between the rear side windows and the rear windshield, primarily supports the roof and body structure while also contributing to the vehicle's overall rigidity. The design and angle of the C-pillar affect rearward visibility and the vehicle's aerodynamic performance.

[0047] Preferably, the upper swing arm assembly and the lower swing arm assembly are connected between the C-pillar and the swing door of the vehicle body.

[0048] Preferably, an upper swing arm assembly 60 is further included; an upper swing arm body 61 of the upper swing arm assembly 60 is hinged to the vehicle body and the door through a first mounting block 62 and a second mounting block 63 respectively.

[0049] Automatic swing door control

[0050] The automatic swing door is controlled by an electronic control module, which may include a microprocessor and a memory having executable computer-readable instructions stored therein. The electronic control module can communicate with a remote key fob and / or an interior / exterior handle switch for receiving a user's request to open or close the vehicle door. Alternatively, the electronic control module can receive a command signal from the remote key fob and / or the interior / exterior handle switch to initiate the opening or closing of the vehicle door. Upon receiving the command, the electronic control module then provides a signal to the actuator 10 to activate the motor 11 and initiate the pivoting of the vehicle door.

[0051] Preferably, while providing the signal, the electronic control module also obtains feedback from the Hall effect sensor of the motor to ensure that there is no contact obstacle. If there is no obstacle, rotational force will continue to be generated to drive the rack to achieve rotation.

[0052] The ECU may also receive additional input from a proximity sensor, such as an ultrasonic or radar sensor positioned in a vehicle door. The ultrasonic sensor assesses whether an obstacle, such as another vehicle, a tree, or a pole, is approaching or very close to the vehicle door. If such an obstacle is present, the ultrasonic sensor sends a signal to the ECU, which then proceeds to deactivate the motor that blocks door movement, thereby preventing the door from striking the obstacle. Alternatively, a contact obstacle avoidance system may be positioned in the vehicle and include a contact sensor mounted on the door, operable to send a signal to the ECU.

[0053] When the automatic swing door is opened, the differential drive assembly as described above is used to prevent the transmission system from getting stuck.

[0054] The above description is only for illustrating the present invention. It should be understood that the present invention is not limited to the above embodiments, and various variations that conform to the concept of the present invention are within the scope of protection of the present invention.

Claims

1. A differential drive assembly, characterized in that: include: A driver (10), the driver (10) comprising a motor (11) and a driver output shaft (12) driven by the motor; A differential housing assembly (30) includes a differential upper housing (32) and a differential lower housing (33) and a mounting cavity formed therebetween, wherein the differential lower housing (33) has a lower shaft sleeve; A differential assembly (20) includes an upper half-shaft gear (21), a planetary gear (23), a lower half-shaft gear (22), and a differential output shaft (26) in sequence; a driver output shaft (12) is connected to the upper half-shaft gear (21); the planetary gear (23) is installed in a differential housing assembly (30) through a planetary gear shaft (24) and meshes with the upper half-shaft gear (21) and the lower half-shaft gear (22); the differential output shaft (26) is located in a lower sleeve of the differential lower housing (33); A mounting frame (40) provided with a guide rail; The lower swing arm assembly (50) includes a lower swing arm sleeve (54) and a rack (52) fixedly arranged in the lower swing arm sleeve (54); and also includes a bushing (51), wherein the bushing (51) has an insertion end slidably located in the lower swing arm sleeve (54) and a rotation end rotatably mounted on the mounting frame (40). The differential output shaft (26) extends into the bushing (51) and is in transmission engagement with the rack (52), and the lower shaft sleeve of the differential lower housing (33) is in transmission engagement with the bushing (51); the positional relationship between the lower swing arm sleeve (54) and the bushing (51) and the overall length of the lower swing arm assembly (50) are adjusted by changing the positional relationship between the differential output shaft (26) and the rack (52); during the adjustment process, the lower swing arm sleeve (54) moves relative to the mounting frame (40) and is constrained by the guide track, and the bushing (51) rotates relative to the mounting frame (40).

2. The differential drive assembly according to claim 1, wherein: The mounting frame (40) further includes a body (41), the body (41) including an upper mounting plate, a side plate and a lower mounting plate, and the guide rails are an upper guide rail (43) on the upper mounting plate and a lower guide rail (44) on the lower mounting plate; The bushing (51) is a sleeve structure, and a convex edge is provided above the rotating end of the sleeve structure. The convex edge can be rotatably positioned in the mounting hole (42) of the upper mounting plate. The inner side of the convex edge has a transmission tooth or a transmission key that is transmission-matched with the lower shaft sleeve of the differential lower shell (33); the rack (52) enters from the insertion end of the sleeve structure and is transmission-connected to the differential output shaft (26) at the rotating end.

3. The differential drive assembly according to claim 2, wherein: The lower swing arm sleeve (54) is provided with rollers (55) at the upper and lower ends, and the upper and lower rollers (55) are respectively located in the upper guide rail (43) and the lower guide rail (44).

4. The differential drive assembly according to claim 3, wherein: The differential housing assembly (30) further comprises an upper cover (34) and a lower cover (35); the differential upper housing (32) is mounted in the upper cover (34) via an upper bearing (31), and the lower shaft sleeve of the differential lower housing (33) is mounted in the lower cover (35) via a lower shaft sleeve (37).

5. The differential drive assembly according to claim 4, wherein: The upper half-shaft gear (21) and the lower half-shaft gear (22) of the differential assembly (20) are bevel gears, and the planetary gears (23) are bevel gears and the number of the planetary gears is at least two. The planetary gears (23) are installed between the upper half-shaft gear (21) and the lower half-shaft gear (22) through the planetary gear shaft (24). When the upper half-shaft gear (21) and the lower half-shaft gear (22) rotate at the same speed, the planetary gears (23) rotate on their own; when the upper half-shaft gear (21) and the lower half-shaft gear (22) rotate at a differential speed, the planetary gears (23) perform a combined motion of revolution and rotation.

6. Automobile swing door, comprising a door body, characterized in that: A differential drive assembly as claimed in any one of claims 1 to 5 is used, wherein a lower arm assembly (50) of the differential drive assembly is hinged to the vehicle body, and a mounting frame (40) of the lower arm assembly (50) is fixed to the door body. The differential drive assembly drives the rack to perform linear reciprocating motion, thereby driving the lower arm sleeve (54) to move relative to the mounting frame (40) and be guided to the track limit constraint, so that the door body opens and closes in an outward swinging manner.

7. The automobile swing door according to claim 6, characterized in that: The upper swing arm assembly and the lower swing arm assembly are connected between the C-pillar and the swing door of the vehicle body.

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