Self-priming device for vehicle door

Abstract

This invention discloses a self-closing device for car doors, comprising a base shell, side shells, and a lock cylinder. A drive shaft is fixedly mounted on one end of the latch. A drive arm is sleeved on the left side of the drive shaft. The drive arm is U-shaped, with one end serving as a bracket and the other end having an inclined surface. The drive arm is bearing-connected to the base shell. A signal transmitter is slidably connected above the inclined surface. The other end of the signal transmitter is electrically connected to an ECU / controller, which is an external structure. A drive block is fixedly mounted on the rear side of the pawl. A spherical top post is fixedly mounted on the upper end of the drive block. A curved drive arm is slidably connected to the other end of the spherical top post, and the other end of the curved drive arm is slidably connected to the signal transmitter. This invention achieves automatic door closing and locking. The self-closing operating lever switches contact with a reset pin and a guide inclined surface to achieve door closing control, resulting in smoother operation and lower noise.

Description

Technical Field

[0001] This invention relates to the field of automotive door technology, specifically to a self-closing device for automotive doors. Background Technology

[0002] With the development of the automotive industry, users are demanding higher levels of automation in their vehicles. Traditional car door systems require external force to close the door, but if the force is too small, the door may be partially locked, requiring more force to fully lock it. Some high-end cars use self-closing door locks, which can automatically close and lock the door under certain conditions. However, most current self-closing door locks use multiple actuators to perform self-closing and unlocking separately, resulting in high cost, large size, and noise. The self-closing operating lever in the device is prone to disengagement or uneven operation during reset, and other noises are generated during the closing process. Compared to traditional structures, traditional methods of controlling the rotation of the bending transmission arm are prone to jamming or difficult to control the movement. They also require a large movement space due to excessive stroke, or the transmission structure cannot be implemented due to space limitations. The improved bending transmission arm movement structure of this invention has a margin of error in the direction of movement and avoids jamming. Furthermore, it can control the transmission stroke of different movement areas through the feature settings in three-dimensional space to achieve a transmission structure within a limited space. Summary of the Invention

[0003] The purpose of this invention is to provide a self-closing device for vehicle doors to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a self-closing device for a car door, comprising a bottom shell, a side shell, and a lock opening. A first rotating shaft and a second rotating shaft are fixedly installed on the upper part of the bottom shell. A latch is mounted on the upper bearing of the first rotating shaft, and the latch is installed at the lock opening. A pawl is mounted on the upper bearing of the second rotating shaft. A torsion spring is provided at the connection points between the latch and the pawl and the first and second rotating shafts. A half-locking tooth and a full-locking tooth are integrally formed on the latch, with a transition arc surface between the half-locking tooth and the full-locking tooth. A first drive shaft is fixedly installed at one end of the latch. The left side of the first drive shaft... A U-shaped transmission arm two is sleeved on the bottom shell, and the transmission arm two is bearing connected to the bottom shell. The other end of the transmission arm two is provided with an inclined surface. A signal transmitter one is slidably connected above the inclined surface. The other end of the signal transmitter one is electrically connected to an ECU / controller. The ECU / controller is an external structure. A transmission block two is fixedly installed below the pawl. A spherical top column is fixedly installed at the upper end of the transmission block two. A curved transmission arm is slidably connected to the other end of the spherical top column. The other end of the curved transmission arm is slidably connected to the signal transmitter two. The signal transmitter two is electrically connected to the ECU / controller.

[0005] According to the above technical solution, a transmission curved surface is provided at the sliding connection between the bending transmission arm and the spherical top column. The transmission curved surface can be adjusted according to the required design. One end of the ECU / controller is electrically connected to a pull-wire motor, and the other end of the pull-wire motor is wound with a self-priming pull wire. The other end of the self-priming pull wire is fixedly connected to a rotating arm. A rotating shaft is fixedly installed on the right side of the bottom shell. The rotating arm is bearing-mounted on the rotating shaft. The other end of the rotating arm is bearing-connected to a self-priming operating rod. A guide slope is provided at the lower end of the locking tongue. The self-priming operating rod is slidably connected to the guide slope. A limit block is slidably connected to the end of the locking tongue. The limit block is fixedly installed on the side shell.

[0006] According to the above technical solution, a limiting plate is provided below the self-priming operating rod, and a reset pin is fixedly installed above the limiting plate. The self-priming operating rod is slidably connected to the reset pin, and the self-priming operating rod is an integrally formed metal part with a specific shape.

[0007] According to the above technical solution, a reset torsion spring is provided at the connection between the rotating arm and the self-priming operating rod. One end of the reset torsion spring extends to the bottom of the self-priming operating rod. A reset torsion spring is provided below the limiting plate. One end of the reset torsion spring extends to the bottom of the limiting plate. The extension of the reset torsion spring is slidably connected to the self-priming operating rod.

[0008] According to the above technical solution, the other end of the reset pin is slidably connected to a transmission plate, a rotating shaft four is provided above the bottom shell, the transmission plate bearing is connected to the rotating shaft four, and a transmission curved surface is provided at the connection between the transmission plate and the reset pin.

[0009] According to the above technical solution, the lower end of the transmission plate is connected to a transmission rod, the other end of the transmission rod is connected to an inner switch arm, a transmission block is provided in the middle of the transmission plate, the transmission block is mounted on the bottom shell, a sleeve curved surface is opened inside the transmission block, a pawl pin is slidably connected in the sleeve curved surface, and the other end of the pawl pin is mounted on the pawl.

[0010] According to the above technical solution, a transmission block two is fixedly installed below the pawl, a spherical top column is fixedly installed at the upper end of the transmission block two, a curved transmission arm is slidably connected to the other end of the spherical top column, a transmission curved surface is provided at the sliding connection between the curved transmission arm and the spherical top column, and a signal transmitter two is slidably connected to the other end of the curved transmission arm, and the other end of the signal transmitter two is electrically connected to the ECU / controller.

[0011] According to the above technical solution, the other end of the ECU / controller is electrically connected to a drive motor. The drive motor is fixedly installed on the upper end of the bottom shell. A worm gear is fixedly installed on the lower end of the drive motor. A transmission gear is meshed with the right end of the worm gear. A transmission rod two is eccentrically rotatably connected below the transmission gear. A locking plate is bearing-connected to the other end of the transmission rod two. A locking curved surface is provided on the other end of the locking plate. A mating block three is provided on one end of the transmission block one. The locking curved surface and the mating block three are slidably connected.

[0012] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: 1. The present invention provides a special operating rod with a self-priming operating rod integrally formed. The self-priming operating rod has a specific shape, with a protrusion in the middle of the complete shape that slides and connects with the reset pin. The self-priming operating rod with the above-mentioned specific structure has better elasticity and mechanics. During the self-priming operation rod's priming and reset process, the self-priming operating rod either contacts the reset pin or contacts the guide slope. That is, the self-priming operating rod slightly slides from the guide slope to the reset pin, resulting in smoother operation and less noise.

[0013] 2. By setting a spherical top column, when the pawl rotates, it drives the second transmission block to rotate. The second transmission block drives the spherical top column to rotate. The spherical surface at the upper end of the spherical top column moves on the transmission curved surface, pushing the curved transmission arm to rotate to the right, so that the curved transmission arm pushes upward to the signal transmitter two. Due to the specific shape of the curved transmission arm and the cooperation of the transmission curved surface, the space occupied by the curved transmission arm to rotate is reduced, and the stroke of the curved transmission arm is controllable. The shape or angle of the transmission curved surface can be adjusted according to the size of the space to control the rotation of the curved transmission arm. Compared with the traditional structure, the current structure has a margin in the direction of movement and avoids jamming.

[0014] 3. The automatic door closing and locking is achieved by setting up a pull-wire motor, a self-closing pull wire, and a self-closing operating lever. The ECU / controller, signal transmitter one, and signal transmitter two are set up to determine the position of the latch and pawl at any time to ensure that the door is in a fully locked state. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0016] Figure 1 This is a schematic diagram of the overall frontal three-dimensional structure of the present invention;

[0017] Figure 2 This is a three-dimensional schematic diagram of the internal structure of the present invention;

[0018] Figure 3 This is a schematic diagram of the self-priming structure of the present invention;

[0019] Figure 4 This is a schematic diagram of the latch signal transmitter of the present invention;

[0020] Figure 5 This is a schematic diagram of the internal front structure of the present invention;

[0021] Figure 6 This is a schematic diagram of the self-priming structure of the present invention;

[0022] Figure 7 This is a top view of the bottom shell structure of the present invention;

[0023] Figure 8 This is a partially enlarged schematic diagram of point A in the present invention;

[0024] Figure 9 This is a schematic diagram of the locking structure of the present invention;

[0025] In the diagram: 1. Bottom shell; 2. Side shell; 3. Locking jaw; 4. Rotating shaft three; 5. Self-priming operating lever; 7. Transmission arm one; 8. Pawl; 9. Limiting block one; 11. Locking tongue; 12. Reset pin; 13. Drive motor; 14. Worm gear; 15. Transmission gear; 16. Locking arm; 17. External switch arm; 18. Rotating shaft one; 19. Rotating shaft two; 20. Self-priming pull cable; 21. Full locking tooth; 22. Half locking tooth; 23. Limiting plate; 25. Reset torsion spring one; 26. Guide slope; 27. Transmission curved surface; 29. ​​Reset... 31. Limiting spring 2; 32. Pull-wire motor; 33. Drive shaft 1; 34. Drive arm 2; 35. Signal transmitter 1; 36. Inner switch arm; 37. Drive rod 1; 38. Drive plate; 39. Rotating shaft 4; 40. Drive block 1; 41. Drive rod 2; 42. Locking plate; 43. Sleeve curved surface; 44. Pawl pin; 45. Mating block 3; 46. Drive block 2; 47. Spherical top column; 48. Drive curved surface; 49. Bending drive arm; 50. Signal transmitter 2; 51. Locking curved surface. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1, please refer to Figure 1-6This invention provides a technical solution: a self-closing device for a car door, comprising a bottom shell 1, a side shell 2, and a lock opening 3. A first rotating shaft 18 and a second rotating shaft 19 are fixedly mounted on the bottom shell 1. A latch 11 is mounted on the upper bearing of the first rotating shaft 18, and the latch 11 is installed close to the lock opening 3. A pawl 8 is mounted on the upper bearing of the second rotating shaft 19. Rebound torsion springs are provided at the connection points between the latch 11 and the pawl 8 and the first rotating shaft 18 and the second rotating shaft 19. The upper integrally formed door has a semi-locking tooth 22 and a full-locking tooth 21, with a transition arc surface between them. When the pawl 8 engages with the semi-locking tooth 22, the door is in a semi-locked state; when the pawl 8 engages with the full-locking tooth 21, the door is in a fully locked state. A drive shaft 33 is fixedly mounted on one end of the latch 11. The drive arm 34 is U-shaped, with one end serving as a bracket, and the other end having an inclined surface. The drive arm 34 is connected to a bearing... On the bottom shell, the other end of the transmission arm 2 34 is provided with an inclined surface. A signal transmitter 1 35 is slidably connected above the inclined surface. The other end of the signal transmitter 1 35 is electrically connected to an ECU / controller. The ECU / controller is an external structure. A rotating shaft 3 4 is fixedly installed on the right side of the bottom shell 1. A rotating arm 1 7 is mounted on the bearing above the rotating shaft 3 4. One end of the rotating arm 1 7 is connected to a self-priming pull cable 20. The other end of the rotating arm 1 7 is axially connected to a self-priming operating rod 5. A pull cable motor 32 is provided at the other end of the self-priming pull cable 20. A guide inclined surface 26 is provided at the lower end of the locking tongue 11. The self-priming operating rod 5 is slidably connected to the guide inclined surface 26. A limit block 1 9 is slidably connected to the end of the locking tongue 11. The limit block 1 9 is fixedly installed on the side shell 2. A limit plate 23 is provided below the self-priming operating rod 5. A reset pin 12 is fixedly installed above the limit plate 23. The self-priming operating rod 5 is slidably connected to the reset pin 12.

[0028] Specifically, in this embodiment, when the car door is closed by manual pulling, the external force acting on the door is relatively small, causing the door to be in a half-locked state. The pushing force causes the latch 11 to rotate, which in turn rotates the drive shaft 33. The drive shaft 33 rotates to the right, which in turn rotates the drive arm 34 to the left. At this time, the signal transmitter 35 is still in contact with the drive arm 34, and the signal transmitter 35 continues to transmit the signal that the latch 11 is not in a fully locked state to the ECU / controller. The ratchet 12 engages with the half-locking tooth 22, and the latch 11 is in a half-locked state. At this time, the ECU / controller drives the cable motor 32 to start. The cable motor 32 pulls the self-priming cable 20 to move away from the drive arm 33. The drive arm 33 drives the lower self-priming operating lever 5 to move to the left, which is achieved through the reset pin 12. The self-priming operating lever 5 is guided and attached to the guide slope 26. The self-priming operating lever 5 then disengages from the reset pin 12 and pushes the locking tongue 11 to rotate until the end of the locking tongue 11 abuts against the limit block 9. When the reset pin 12 and the guide slope 26 are working, only one of them is in contact with the self-priming operating lever 5, causing the pawl 8 to disengage from the half-locking tooth 22 and engage with the full-locking tooth 21. The locking tongue 11 is fully locked. At this time, the signal transmitter 35 contacts the slope of the transmission arm 34. The switch of the signal transmitter 35 is released, and the signal that the locking tongue 11 is not in a fully locked state is stopped. The signal of the signal transmitter 35 will be displayed on the ECU / controller in real time to remind the driver to prevent accidents from occurring during driving when the door is in a half-locked state. At the same time, the ECU / controller shuts down the cable motor 32.

[0029] Example 2, please refer to Figure 2-6 ,like Figure 3 As shown, the self-priming operating lever 5 is a special operating lever integrally formed. The self-priming operating lever 5 has a specific shape, with a protrusion in the middle that slides and connects with the reset pin 12. The self-priming operating lever 5 adopts the above structure, which can serve as a guide, a limit, and adjust the displacement pushed open by the reset pin 12 during the entire movement. A reset torsion spring 25 is provided at the connection between the transmission arm 7 and the self-priming operating lever 5. One end of the reset torsion spring 25 extends to the bottom of the self-priming operating lever 5. A reset torsion spring 29 is provided below the limiting plate 23. One end of the reset torsion spring 29 extends to the bottom of the limiting plate 23. The extension of the reset torsion spring 29 is connected to the self-priming operating lever 5. The sliding connection is provided. The other end of the limiting plate 23 is slidably connected to the transmission plate 38. The top of the bottom shell 1 is provided with the rotating shaft 39. The transmission plate 38 is connected to the rotating shaft 39 by a bearing. The connection between the transmission plate 38 and the limiting plate 23 is the transmission curved surface 27. The lower end of the transmission plate 38 is connected to the transmission rod 37 by a bearing. The other end of the transmission rod 37 is connected to the inner switch arm 36 by a bearing. The middle of the transmission plate 38 is provided with a mating hole. The inside of the mating hole is provided with a transmission block 40. The transmission block 40 is mounted on the bottom shell 1 by a bearing. The inside of the transmission block 40 is provided with a sleeve curved surface 43. A pawl pin 44 is slidably connected inside the sleeve curved surface 43. The other end of the pawl pin 44 is fixedly mounted on the pawl 8.

[0030] Specifically, in this embodiment, the self-closing operating lever 5, with the above structure, can serve as a guide, limit left and right movement, and adjust the displacement pushed open by the reset pin 12 during the entire movement. When the self-closing operating lever 5 pushes the latch 11 to rotate, the reset torsion spring 25 provides downward pressure to the self-closing operating lever 5, causing it to conform to the guide slope 26. When the door needs to be opened, the inner switch arm 36 rotates, causing the transmission rod 37 to move away from the inner switch arm 36. The transmission rod 37 drives the transmission plate 38 to rotate, causing the lower transmission curved surface 27 to press down the reset pin 12. The reset pin 12 drives the limiting plate 23 to rotate downward, causing the reset pin 12 to contact the self-closing operating lever 5 and push the self-closing operating lever 5 away from the guide slope 26, thus interrupting the self-closing of the self-closing operating lever 5 and preventing self-closing. After the limiting plate 23 resets, the self-closing operating lever is in contact with the reset torsion spring. The self-priming operating lever 5 is reset under the action of the rebound force of the first 25. However, due to the small lever arm of the first 25 and the long overall length of the self-priming operating lever 5, the first 25 is difficult to provide a large reset torque to the self-priming operating lever. By extending the second 29 of the reset torsion spring, the second 29 of the reset torsion spring is slidably connected to the self-priming operating lever 5 to assist in the reset of the self-priming operating lever 5. At the same time, the rotation of the transmission plate 38 drives the internal transmission block 40 to rotate. The sleeve curved surface 43 of the transmission block 40 pushes the pawl pin 44 to rotate. The pawl pin 44 drives the pawl 8 to rotate in the direction of opening the latch 11, so that the rebound torsion spring inside the latch 11 drives the latch 11 to rotate to the left to open. During the engagement and reset process of the self-priming operating lever 5, the self-priming operating lever 5 either contacts the reset pin 12 or contacts the guide slope 26. That is, the self-priming operating lever 5 slightly slides from the guide slope 26 to the reset pin 12, making the operation smoother and the noise lower.

[0031] Example 3, please refer to Figure 2-9 A transmission block 46 is fixedly installed below the pawl 8, and a spherical top post 47 is fixedly installed at the upper end of the transmission block 46. A curved transmission arm 49 is slidably connected to the other end of the spherical top post 47. Figure 4 and 8As shown, a transmission curved surface 48 is provided at the sliding connection between the curved transmission arm 49 and the spherical top column 47. A signal transmitter 50 is slidably connected to the other end of the curved transmission arm 49. The other end of the signal transmitter 50 is electrically connected to the ECU / controller. The other end of the ECU / controller is electrically connected to the drive motor 13. The drive motor 13 is fixedly installed on the upper end of the bottom shell 1. A worm gear 14 is fixedly installed on the lower end of the drive motor 13. A transmission gear 15 is connected to the right end of the worm gear 14. Three limit blocks are evenly installed on the upper end of the transmission gear 15. One end of the limit block is provided with limit block 2 31, and the other end of the three limit blocks is connected to the locking arm 16. The other end of the locking arm 16 is slidably connected to the outer switch arm 17. The other end of the outer switch arm 17 is slidably connected to the upper end of the transmission plate 38. The lower part of the transmission gear 15 is eccentrically connected to the transmission rod 2 41. The other end of the transmission rod 2 41 is connected to the locking plate 42 by a bearing. The other end of the locking plate 42 is provided with the locking curved surface 51. One end of the transmission block 1 40 is provided with the mating block 3 45. The locking curved surface 51 is slidably connected to the mating block 3 45.

[0032] Specifically, in embodiment three, when the car owner opens the door from the outside, the external switch arm 17 rotates, pushing the transmission plate 38 to rotate. This causes the transmission plate 38 to release the pawl 8, and the latch 11 springs back to open the door. The rotation of the pawl 8 causes the transmission block 46 to rotate, which in turn causes the spherical top post 47 to rotate. The spherical surface at the upper end of the spherical top post 47 moves on the transmission curved surface 48, pushing the curved transmission arm 49 to rotate to the right. This causes the curved transmission arm 49 to push upwards against the signal transmitter 50. When the pawl 8 is locked, the curved transmission arm 49 disengages from the signal transmitter 50. The signal transmitter 50 then transmits the position signal of the pawl 8 to the ECU / controller. The curved shape of the curved transmission arm 49 and the shape of the transmission curved surface 48 reduce the space occupied by the curved transmission arm 49 during rotation, and the stroke of the curved transmission arm 49 is controllable, adjustable according to the available space. The shape or angle of the transmission curved surface 48 is used to control the rotation of the bending transmission arm 49. Compared with the traditional structure, the current structure has a margin of error in the direction of movement and avoids jamming. When the ECU / controller receives the signal of the lock tongue 11 fully locked and the pawl 8 locked, the ECU / controller starts the drive motor 13. The drive motor 13 drives the transmission gear 15 to rotate through the worm gear 14. The limit block and the second limit block 31 control the rotation angle of the transmission gear 15. The transmission gear 15 drives the locking arm 16 to rotate, so that the locking arm 16 rotates to the upper end of the outer switch arm 17 to block the rotation angle of the outer switch arm 17, so that the door cannot be opened from the outside. At the same time, the transmission gear 15 drives the second transmission rod 41 below to move away from the drive motor 13. The second transmission rod 41 drives the locking plate 42 below. The locking plate 42 rotates to contact the locking curved surface 51 with the mating block 3 45. The locking curved surface 51 is like Figure 9As shown, the reset pin 12 will not contact the self-priming operating lever 5, thereby locking the door. The door can only be opened by reversing the drive motor 13 through the ECU / controller or the car key, thus preventing the door from opening during vehicle operation.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0034] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-closing device for a car door, comprising a bottom shell (1), a side shell (2), and a lock (3), characterized in that: A rotating shaft 1 (18) and a rotating shaft 2 (19) are fixedly installed on the top of the bottom shell (1). A locking tongue (11) is mounted on the bearing above the rotating shaft 1 (18). The locking tongue (11) is installed in contact with the lock opening (3). A pawl (8) is mounted on the bearing above the rotating shaft 2 (19). A spring-loaded torsion spring is provided at the connection between the locking tongue (11) and the pawl (8) and the rotating shaft 1 (18) and the rotating shaft 2 (19). A half-locking tooth (22) and a full-locking tooth (21) are integrally formed on the locking tongue (11). A transition arc surface is provided between the half-locking tooth (22) and the full-locking tooth (21). A transmission shaft 1 (33) is fixedly installed on one end of the locking tongue (11). A U-shaped transmission shaft is sleeved on the left side of the transmission shaft 1. The second boom (34) has an inclined surface at the other end. The second boom (34) is connected to the bottom shell (1) by a bearing. A signal transmitter (35) is slidably connected above the inclined surface. An ECU is electrically connected to the other end of the signal transmitter (35). The ECU is an external structure. A second transmission block (46) is fixedly installed on the rear side of the pawl (8). A spherical top column (47) is fixedly installed on the upper end of the second transmission block (46). A curved transmission arm (49) is rotatably connected to the other end of the spherical top column (47). A second signal transmitter (50) is slidably connected to the other end of the curved transmission arm (49). The second signal transmitter (50) is electrically connected to the ECU. The curved transmission arm (49) and the spherical top column (47) are connected by a transmission surface (48). The transmission surface (48) can be adjusted according to the design requirements. One end of the ECU is electrically connected to a pull wire motor (32). The other end of the pull wire motor (32) is wound with a self-priming pull wire (20). The other end of the self-priming pull wire (20) is rotatably connected to a rotating arm (7). The right side of the bottom shell (1) is fixedly installed with a rotating shaft (4). The rotating arm (7) is mounted on the rotating shaft (4). The other end of the rotating arm (7) is connected to a self-priming operating rod (5). The lower end of the locking tongue (11) is provided with a guide slope (26). The self-priming operating rod (5) is in sliding contact with the guide slope (26). The end of the locking tongue (11) is provided with a buffer block (9). The buffer block (9) is fixedly installed on the side shell (2). A limiting plate (23) is provided below the self-priming operating lever (5), and a reset pin (12) is fixedly installed above the limiting plate (23). The self-priming operating lever (5) abuts against one side of the reset pin (12). The self-priming operating lever (5) is an integrally formed metal part with a specific shape.

2. The self-closing device for a car door according to claim 1, characterized in that: A reset torsion spring 1 (25) is provided at the connection between the rotating arm 1 (7) and the self-priming operating lever (5). One end of the reset torsion spring 1 (25) extends to the bottom of the self-priming operating lever (5). A reset torsion spring 2 (29) is provided below the limiting plate (23). One end of the reset torsion spring 2 (29) extends to the bottom of the limiting plate (23). The extension of the reset torsion spring 2 (29) abuts against one side of the self-priming operating lever (5).

3. The self-closing device for a car door according to claim 2, characterized in that: The other end of the limiting plate (23) is driven at the lower end of the transmission plate (38). A rotating shaft (39) is provided above the bottom shell (1). The transmission plate (38) is rotatably connected to the rotating shaft (39). A transmission curved surface (27) is provided at the connection between the transmission plate (38) and the limiting plate (23).

4. A self-closing device for a car door according to claim 3, characterized in that: The lower end of the transmission plate (38) is connected to a transmission rod (37) by a bearing, and the other end of the transmission rod (37) is connected to an external switch arm (36) by a bearing. A transmission block (40) is provided in the middle of the transmission plate (38). The transmission block (40) is rotatably mounted on the transmission plate (38). A sleeve curved surface (43) is provided inside the transmission block (40). A pawl pin (44) is provided inside the sleeve curved surface (43). The other end of the pawl pin (44) is mounted on a pawl (8).

5. A self-closing device for a car door according to claim 4, characterized in that: A transmission block two (46) is fixedly installed below the pawl (8). A spherical top column (47) is fixedly installed at the upper end of the transmission block two (46). A curved transmission arm (49) is slidably connected to the other end of the spherical top column (47). A transmission curved surface (48) is provided at the transmission contact position between the curved transmission arm (49) and the spherical top column (47). A signal transmitter two (50) is provided at the other end of the curved transmission arm (49). The other end of the signal transmitter two (50) is electrically connected to the ECU.

6. A self-closing device for a car door according to claim 5, characterized in that: The other end of the ECU is electrically connected to a drive motor (13). The drive motor (13) is fixedly installed on the upper end of the bottom shell (1). The lower end of the drive motor (13) is provided with a worm gear (14). The right end of the worm gear (14) is meshed with a transmission gear (15). The lower part of the transmission gear (15) is eccentrically rotatably connected to a transmission rod (41). The other end of the transmission rod (41) is rotatably connected to a locking plate (42). The other end of the locking plate (42) is provided with a locking surface (51). One end of the transmission block (40) is provided with a mating block (45). The mating block (45) abuts against the locking surface (51).

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