Integrated automobile tail door self-suction lock

Abstract

The utility model discloses an integrated automobile tail door self-suction lock, including main part cover, lower cover and motor, the inside one side of lower cover is hinged with ratchet wheel, the other side rotation mounting of lower cover bottom has ratchet pawl, the inside rotation of casing is installed with the output gear of driving ratchet wheel and ratchet pawl rotation, the output of motor is fixedly connected with transmission assembly, the inside of casing and the position of corresponding ratchet wheel and ratchet pawl are provided with second torsional spring and first torsional spring. The utility model sets up the motor to provide drive source, utilizes transmission assembly to drive the rotation of unlocking swing arm and self-suction swing arm on output gear, so can utilize a group of motor's positive and negative rotation drive to replace traditional double motor structure, and the snow load prong on ratchet pawl and the snow load limiting rib on ratchet wheel form mechanical interlock, and the setting snow load prong is pressed under the action of self bending force and prevents ratchet pawl from resetting in advance, and manually poking the emergency release rod on ratchet pawl can directly drive ratchet pawl unlocking.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, specifically to an integrated self-closing lock for automotive tailgates. Background Technology

[0002] The tailgate lock is a core component for ensuring the security of a vehicle's trunk, and it must meet the requirements of reliable locking, flexible opening, and intelligent operation. With the increasing penetration rate of new energy vehicles and consumers' growing demand for convenience, electric tailgate locks with self-closing functions are becoming the mainstream trend.

[0003] The current market technology routes are mainly divided into two categories:

[0004] Split design: The actuator is separated from the lock body and unlocking is achieved by pulling a rope, resulting in a large number of parts, complex installation, and a high failure rate.

[0005] Dual-motor structure: one motor is responsible for unlocking, and the other enables self-priming. Although it is fully functional, it is expensive and bulky.

[0006] Disadvantages of existing technology:

[0007] Structural complexity and high cost:

[0008] The split design requires an independent drive module, an external actuator, and additional wiring harnesses, increasing the number of parts by more than 30% and raising material and assembly costs.

[0009] Dual-motor solutions, such as unlocking + self-priming independent motors or worm gear-gear multi-stage transmission chains, result in transmission efficiency loss and a high risk of motor overload, especially when the sealing strips freeze in low-temperature environments.

[0010] Poor space occupation and adaptability:

[0011] Traditional self-priming mechanisms use an L-shaped motor layout or an external slider, increasing the lock body thickness by 40%, making it difficult to fit the tailgate space of compact new energy vehicles.

[0012] Reliability and response latency:

[0013] In low-temperature environments, the pawl cannot reset due to the tailgate freezing, resulting in the limit switch not being triggered and the motor running continuously without power and burning out.

[0014] Therefore, we propose an integrated self-closing lock for car tailgates. Utility Model Content

[0015] The purpose of this invention is to provide an integrated self-closing lock for automobile tailgates to solve the problems mentioned in the background art.

[0016] To achieve the above objectives, this utility model provides the following technical solution: an integrated car tailgate self-closing lock, comprising a housing, the housing comprising a main cover and a lower cover connected to each other, a motor fixedly installed inside the housing, a ratchet rotatably connected to one side inside the lower cover, a pawl rotatably installed on the other side of the bottom of the lower cover, an output gear rotatably installed between the main cover and the lower cover to drive the ratchet and pawl to rotate, a transmission assembly for driving the output gear to rotate fixedly connected to the output end of the motor, and a second torsion spring and a first torsion spring provided inside the housing at positions corresponding to the ratchet and pawl.

[0017] Furthermore, an arc-shaped snow load limiting rib is fixedly installed on the ratchet, a snow load lever is fixedly connected to one side of the pawl and disposed on one side of the snow load limiting rib, a self-priming swing arm for driving the ratchet to rotate is disposed on one side of the output gear, and an unlocking swing arm for driving the ratchet to unlock is disposed on the other side of the output gear.

[0018] Furthermore, the transmission assembly includes a motor output gear, a first stepped gear, and a second stepped gear. The output end of the motor is fixedly connected to the motor output gear. One end of the motor output gear is provided with a first limiting sleeve fixedly connected to the inside of the housing. Inside the housing and on one side of the motor output gear, a first stepped gear that meshes with the motor output gear is rotatably connected through two sets of second limiting sleeves. Inside the housing and on one side of the first stepped gear, a second stepped gear that meshes with the first stepped gear is provided. The second stepped gear drives the output gear to rotate.

[0019] Furthermore, microswitches are fixedly installed inside the housing at positions corresponding to the output gear, ratchet, and pawl.

[0020] Furthermore, multiple sets of anti-collision blocks made of rubber material are fixedly installed inside the housing and on both sides corresponding to the ratchet and pawl.

[0021] Furthermore, one end of the pawl is fixedly connected to an emergency release lever extending to the outside of the housing.

[0022] Compared with the prior art, the present invention has the following advantages: The motor provided by the present invention provides the driving source, and then a three-stage gear transmission component is used to achieve high transmission ratio self-engagement. The output gear is integrated with an unlocking swing arm and a self-engagement swing arm. In this way, the forward and reverse drive of a set of motors can replace the traditional dual-motor structure, reducing the number of product parts.

[0023] The emergency release lever and snow-loaded paddle on the pawl are integrally molded, eliminating separate parts and reducing assembly complexity. Moreover, the snow-loaded paddle on the pawl and the snow-loaded limiting rib on the ratchet form a mechanical interlock. This design prevents the pawl from resetting prematurely under its own bending force, ensuring a high success rate for unlocking on a single attempt. Manually moving the emergency release lever on the pawl can directly drive the pawl to unlock, providing a fast response and avoiding the risk of power failure.

[0024] Furthermore, the contact position of the ratchet and pawl is designed with a wave structure, and rubber anti-collision blocks are added at the collision point of the ratchet and pawl to reduce noise during operation. Multiple microswitches corresponding to the positions of the output gear, ratchet, and pawl can provide real-time feedback to the vehicle ECU, enabling millisecond-level status judgment and action optimization. After self-priming is completed, the motor automatically reverses and resets to avoid stall losses. In addition, the transmission components are equipped with a first limit bushing and a second limit bushing to reduce component vibration and noise, thereby improving transmission efficiency. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural schematic diagram of the present utility model;

[0026] Figure 2 This is a three-dimensional structural diagram of the internal structure of the housing of this utility model;

[0027] Figure 3 This is a first perspective view of the output gear structure of this utility model;

[0028] Figure 4 This is a second perspective view of the structure of the output gear of this utility model;

[0029] Figure 5 This is a three-dimensional structural diagram of the ratchet of this utility model;

[0030] Figure 6 This is a three-dimensional structural diagram of the ratchet pawl of this utility model.

[0031] In the diagram: 1. Housing, 2. Motor, 3. Transmission assembly, 4. Output gear, 5. Ratchet, 6. Pawl, 7. First torsion spring, 8. Second torsion spring, 9. Motor output gear, 10. First limiting bushing, 11. First stepped gear, 12. Second stepped gear, 13. Second limiting bushing, 14. Anti-collision block, 15. Micro switch, 16. Unlocking swing arm, 17. Self-priming swing arm, 18. Snow load limiting rib, 19. Snow load paddle, 20. Emergency release lever, 21. Main body cover, 22. Lower cover. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Please see Figures 1-6 This utility model provides a technical solution: an integrated car tailgate self-closing lock, including a housing 1. The housing 1 includes a main cover 21 and a lower cover 22 connected to each other. A motor 2 is fixedly installed inside the housing 1. A ratchet 5 is rotatably connected to one side of the lower cover 22, and a pawl 6 is rotatably installed on the other side of the bottom of the lower cover 22. An output gear 4 that drives the ratchet 5 and the pawl 6 to rotate is rotatably installed between the main cover 21 and the lower cover 22. The output end of the motor 2 is fixedly connected to a drive output gear 4 to rotate. The transmission assembly 3 has a second torsion spring 8 and a first torsion spring 7 inside the housing 1, corresponding to the positions of the ratchet 5 and the pawl 6. The contact position between the ratchet 5 and the pawl 6 is set with a wave structure. An arc-shaped snow load limiting rib 18 is fixedly installed on the ratchet 5. A snow load paddle 19 is fixedly connected to one side of the snow load limiting rib 18. A self-priming swing arm 17 for driving the ratchet 5 to rotate is provided on one side of the output gear 4. An unlocking swing arm 16 for driving the ratchet 5 to unlock is provided on the other side of the output gear 4.

[0034] The system utilizes a motor 2 as the drive source, followed by a three-stage gear transmission assembly 3 to achieve high transmission ratio self-locking. The output gear 4 integrates an unlocking swing arm 16 and a self-locking swing arm 17. This allows the forward and reverse rotation of a single motor 2 to replace the traditional dual-motor structure, reducing the number of components. When the transmission assembly 2 drives the output gear 4 to rotate, the self-locking swing arm 17 drives the ratchet 5, which pulls the latch to fully lock the tailgate. Simultaneously, the pawl 6, under the action of the first torsion spring 7, cooperates with the ratchet 5 to engage the lock body at the self-locking point. When the tailgate needs to be opened, the vehicle ECU powers the motor 2, causing the unlocking swing arm 16 on the output gear 4 to rotate. The ratchet overcomes the force of the first torsion spring 7 on the pawl 6, causing the lock body to engage in a self-locking state. Simultaneously, the ratchet 5 releases the lock hook under the action of the second torsion spring 8. Then, under the action of the tailgate electric strut, the tailgate opens. Moreover, the snow load lever 19 on the pawl 6 and the snow load limiting rib 18 on the ratchet 5 form a mechanical interlock. This setting prevents the pawl 6 from resetting prematurely under its own bending force, ensuring a high success rate for single unlocking. The ratchet 5 and pawl 6 are respectively equipped with a second torsion spring 8 and a first torsion spring 7. Under the action of the first torsion spring 7 and the second torsion spring 8, the ratchet 5 and pawl 6 always tend to be in contact, ensuring the stable working state of the lock and preventing accidental unlocking or locking due to vibration causing the ratchet 5 and pawl 6 to separate.

[0035] Please see Figure 1 and Figure 2 The transmission assembly 3 includes a motor output gear 9, a first stepped gear 11, and a second stepped gear 12. The output end of the motor 2 is fixedly connected to the motor output gear 9. One end of the motor output gear 9 is provided with a first limiting bushing 10 fixedly connected to the inside of the housing 1. The first stepped gear 11, which meshes with the motor output gear 9, is rotatably connected to the inside of the housing 1 and located on one side of the motor output gear 9 through two sets of second limiting bushings 13. The second stepped gear 12, which meshes with the first stepped gear 11, is provided inside the housing 1 and located on one side of the first stepped gear 11. The second stepped gear 12 drives the output gear 4 to rotate.

[0036] When the motor 2 is working, it can drive the motor output gear 9 to rotate. Then, the motor output gear 9 can drive the output gear 4 to rotate using the first step gear 11 and the second step gear 12. This transmission method achieves high transmission ratio self-engagement. In addition, the first limit bushing 10 and the second limit bushing 13 can support the high-speed rotating parts, reduce shaking and noise, and improve transmission efficiency.

[0037] Please see Figure 1 and Figure 2Microswitches 15 are fixedly installed inside the housing 1 at positions corresponding to the output gear 4, ratchet 5, and pawl 6. Multiple sets of microswitches 15 corresponding to the positions of the output gear 4, ratchet 5, and pawl 6 can provide real-time feedback of position to the vehicle ECU, enabling millisecond-level state judgment and action optimization. After self-priming is completed, the motor 21 automatically reverses and resets to avoid stall losses.

[0038] Please see Figure 1 and Figure 2 Multiple sets of anti-collision blocks 14 made of rubber material are fixedly installed inside the housing 1 and on both sides corresponding to the ratchet 5 and the pawl 6. Adding rubber anti-collision blocks 14 at the collision point of the ratchet 5 and the pawl 6 can reduce the noise during operation.

[0039] Please see Figure 1 , Figure 2 and Figure 6 One end of the pawl 6 is fixedly connected to an emergency release lever 20 extending to the outside of the housing 1. When the tailgate of the car needs to be opened, but the vehicle battery is depleted, the circuit is faulty, or the electronic lock system fails, or the electronic unlocking function is paralyzed, the pawl 6 is equipped with an emergency release lever 20. The emergency release lever 20 can simulate the unlocking action made by the output gear 4 driving the pawl 6 to achieve the unlocking purpose.

[0040] In use, the motor 2 provides the drive source, and the transmission component 3, which uses a three-stage gear transmission, achieves high transmission ratio self-locking. The output gear 4 integrates the unlocking swing arm 16 and the self-locking swing arm 17. This allows the forward and reverse drive of a single motor 2 to replace the traditional dual-motor structure, reducing the number of product parts. When the transmission component 2 drives the output gear 4 to rotate, the self-locking swing arm 17 drives the ratchet 5. The ratchet 5 pulls the latch to lock the tailgate into a fully locked state. At the same time, the pawl 6, under the action of the first torsion spring 7, cooperates with the ratchet 5 to make the lock body enter the self-locking point. When the tailgate needs to be opened, the vehicle ECU powers the motor 2, which rotates the unlocking arm 16 on the output gear 4 to overcome the force of the first torsion spring 7 on the pawl 6, causing the lock body to engage in a self-locking state. Simultaneously, the ratchet 5 releases the lock hook under the action of the second torsion spring 8. Then, under the action of the tailgate electric strut, the tailgate opens. Furthermore, the snow-loaded paddle 19 on the pawl 6 and the snow-loaded limiting rib 18 on the ratchet 5 form a mechanical interlock. This design prevents the pawl 6 from prematurely resetting under its own bending force, ensuring a high success rate for single unlocking. The ratchet 5 and pawl 6 are each equipped with a second torsion spring 8. Spring 8 and the first torsion spring 7, under the action of the first torsion spring 7 and the second torsion spring 8, ensure that the ratchet 5 and the pawl 6 always tend to be engaged, guaranteeing the stable working state of the lock and preventing accidental unlocking or locking due to vibration causing the ratchet 5 and pawl 6 to separate. When the motor 2 is working, it can drive the motor output gear 9 to rotate. Subsequently, the motor output gear 9 can drive the output gear 4 to rotate using the first stepped gear 11 and the second stepped gear 12. This transmission method achieves high transmission ratio self-engaging, and together with the first limiting bushing 10 and the second limiting bushing 13, it can support the high-speed rotating components. To reduce vibration and noise and improve transmission efficiency, multiple microswitches 15, corresponding to the positions of output gear 4, ratchet 5, and pawl 6, can provide real-time position feedback to the vehicle ECU, enabling millisecond-level status judgment and action optimization. After self-priming, motor 21 automatically reverses and resets to avoid stall losses. When the tailgate needs to be opened, but the vehicle battery is depleted, there is a circuit failure, or the electronic lock system fails, or the electronic unlocking function is paralyzed, an emergency release lever 20 is provided on pawl 6. The emergency release lever 20 can simulate the unlocking action performed by output gear 4 driving pawl 6 to achieve the unlocking purpose.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An integrated automobile tail gate self-suction lock, comprising a shell (1), the shell (1) comprising a main cover (21) and a lower cover (22) connected to each other, a motor (2) being fixedly installed inside the shell (1), characterized in that: A ratchet (5) is rotatably connected to one side of the inside of the lower cover (22), and a pawl (6) is rotatably installed on the other side of the bottom of the lower cover (22). An output gear (4) that drives the ratchet (5) and the pawl (6) to rotate is rotatably installed between the main cover (21) and the lower cover (22). A transmission assembly (3) that drives the output gear (4) to rotate is fixedly connected to the output end of the motor (2). A second torsion spring (8) and a first torsion spring (7) are provided inside the housing (1) at positions corresponding to the ratchet (5) and the pawl (6).

2. The integrated car tailgate self-closing lock according to claim 1, characterized in that: An arc-shaped snow load limiting rib (18) is fixedly installed on the ratchet (5). A snow load pawl (19) is fixedly connected to one side of the pawl (6) and is located on one side of the snow load limiting rib (18). A self-priming swing arm (17) for driving the ratchet (5) to rotate is provided on one side of the output gear (4). An unlocking swing arm (16) for driving the ratchet (5) to unlock is provided on the other side of the output gear (4).

3. An integrated car tailgate self-closing lock according to claim 2, characterized in that: The transmission assembly (3) includes a motor output gear (9), a first stepped gear (11) and a second stepped gear (12). The output end of the motor (2) is fixedly connected to the motor output gear (9). One end of the motor output gear (9) is provided with a first limiting bushing (10) fixedly connected to the inside of the housing (1). The first stepped gear (11) meshing with the motor output gear (9) is rotatably connected to the inside of the housing (1) and located on one side of the motor output gear (9) through two sets of second limiting bushings (13). The second stepped gear (12) meshing with the first stepped gear (11) is provided inside the housing (1) and located on one side of the first stepped gear (11). The second stepped gear (12) drives the output gear (4) to rotate.

4. An integrated car tailgate self-closing lock according to claim 3, characterized in that: Microswitches (15) are fixedly installed inside the housing (1) at positions corresponding to the output gear (4), ratchet (5) and pawl (6).

5. An integrated car tailgate self-closing lock according to claim 4, characterized in that: Multiple sets of anti-collision blocks (14) made of rubber material are fixedly installed inside the housing (1) and on both sides corresponding to the ratchet (5) and pawl (6).

6. An integrated car tailgate self-closing lock according to claim 5, characterized in that: One end of the pawl (6) is fixedly connected to an emergency release lever (20) extending to the outside of the housing (1).

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