Novel double-pull unlocking mechanism

Abstract

The utility model relates to the technical field of automobile hatch cover locks, and provides a novel double-pull unlocking mechanism which comprises an unlocking pulling device, a deflector rod, a tongue piece and a pawl assembly, the pawl assembly and a spring bolt assembly form an unlocking state and a full-locking state during rotation, when unlocking is conducted in the full-locking state, the unlocking pulling device pulls the deflector rod to rotate, and when unlocking is conducted in the full-locking state, the unlocking pulling device pulls the tongue piece to rotate. The pawl assembly moves to a critical state or a state before the pawl assembly is separated from the spring bolt assembly, and unlocking is conducted for the first time; and after the unlocking pulling device is reset, the shifting rod is pulled again to rotate, the tongue piece drives the pawl assembly to continue to move and is separated from the spring bolt assembly, and second-time unlocking is completed. According to the novel double-pull unlocking mechanism, through the secondary pull unlocking design of the deflector rod and the tongue piece, the limitation of the prior art is effectively overcome, the service life of a hatch cover lock is remarkably prolonged, the reliability of the hatch cover lock is remarkably improved, and the requirement for the service life of the hatch cover lock of an electric automobile as high as 3-50 thousand times is met so as to adapt to and promote the development requirement of the automobile industry.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile bonnet locks, and particularly relates to a novel double-pull unlocking mechanism. Background Technique

[0002] With the continuous progress of the automobile industry, automobile lightweight and convenience have become the main trends in the market development. In modern automobiles, the door lock system not only requires the basic safety locking function, but also needs to meet the requirements of convenience, intelligence and other aspects. Especially in the front bonnet lock system of automobiles, since the front bonnet is often used as a luggage compartment and needs to be opened and closed frequently, the reliability and convenience of the door lock are particularly important. The existing front bonnet lock system usually unlocks by using an in-vehicle handle, and then manually toggles the safety hook handle in front of the vehicle to open the front bonnet lock to open the front bonnet. This process is not only cumbersome to operate, but also the front bonnet safety handle is relatively easy to be contaminated and is close to the engine. When manually toggling, it is not only easy to dirty hands, but also may scald fingers in the case of high engine temperature.

[0003] With the continuous development of automobile technology, the automobile door lock system is also constantly innovating and optimizing. In the existing automobile door lock system, many vehicle models adopt a double-pull unlocking structure to improve the safety of the vehicle lock. This structure requires the user to perform two consecutive handle pulling operations in the vehicle to unlock the door, thus effectively preventing misoperation or unauthorized entry. However, there are still some deficiencies in the existing double-pull unlocking structure.

[0004] First: The traditional double-pull unlocking structure usually relies on the intermeshing design of the pawl and the lock tongue. After long-term use, due to repeated meshing and separation, this design is prone to wear, shortening the service life of the door lock. In addition, a large impact force will be generated during the intermeshing process of the pawl and the lock tongue, causing certain damage to the lock body structure, further affecting the reliability and durability of the door lock.

[0005] Second: There are also certain limitations in the volume and weight of the existing double-pull unlocking structure. With the advancement of automobile lightweight design, the door lock system of the vehicle also needs to minimize the volume and weight on the premise of ensuring the function. However, due to the need to set up multiple complex mechanical components, the traditional double-pull unlocking structure has a relatively large overall volume, which is not conducive to the overall vehicle layout and weight reduction. Content of the Utility Model

[0006] In view of this, the utility model aims to propose a novel double-pull unlocking structure, aiming to solve at least one of the problems existing in the existing double-pull unlocking mechanism, such as large Z-direction dimension, poor wear resistance, limited service life, etc.

[0007] To achieve the above object, the technical solution of the utility model is realized as follows:

[0008] A novel double-pull unlocking mechanism, comprising:

[0009] An unlocking pulling device for providing an external force or input power for pulling and unlocking;

[0010] A lever that rotates under the action of the unlocking pulling device and returns to its original position after losing force;

[0011] A tongue piece that is hinged to the lever and can rotate when the lever rotates and return to its original position when the lever returns to its original position;

[0012] A pawl assembly that is rotatably arranged and, when rotating, disengages from the locking tongue assembly or presses against the locking tongue assembly according to the rotation direction to form an unlocked state and a fully locked state;

[0013] When unlocking from the fully locked state, the unlocking pulling device pulls the lever to rotate, and the lever drives the pawl assembly to move to a critical state or a state before disengaging from the locking tongue assembly to complete the first unlocking; after the unlocking pulling device returns to its original position, it pulls the lever to rotate again, and the tongue piece drives the pawl assembly to continue to move and disengage from the locking tongue assembly to complete the second unlocking.

[0014] Further, the lever includes a first pulling claw and a first dialing claw. The first pulling claw is used for connecting with the cable of the unlocking pulling device, and the first dialing claw is used for pushing the pawl assembly to move during the first unlocking. The first pulling claw and the first dialing claw are arranged at an angle along the rotation axis of the lever.

[0015] Further, the lever is limited by a first return torsion spring, and the first return torsion spring is used for the lever to return to its original position when losing force.

[0016] Further, a limiting post is provided on the pawl assembly, and the limiting post is used for the first dialing claw to abut and be limited during the first unlocking movement.

[0017] Further, a first hinge post is provided on the first dialing claw, the tongue piece is sleeved on the first hinge post, and a second return torsion spring is provided on the first hinge post. The second return torsion spring is used for integrally hinging and fixing the tongue piece on the first dialing claw and applying a force for the tongue piece to return to its original position when the lever returns to its original position.

[0018] Further, a first pushing groove is provided on the pawl assembly, and the first pushing groove is used for the tongue piece to abut and be limited during the second unlocking.

[0019] Further, the first pushing groove is provided on one side of the limiting post close to the rotation axis of the lever.

[0020] Further, a first guiding post is arranged on the tongue piece, and the tongue piece is limited and guided by the second return torsion spring and the first guiding post when the lever is forced to rotate.

[0021] Further, during the first unlocking, the unlocking pulling device pulls the lever to rotate, the first pawl on the lever abuts against the limiting post, and the tongue piece does not contact the first pushing groove; after the first unlocking, the lever and the tongue piece are reset, and the pawl assembly moves to the semi-locked state; during the second unlocking, the unlocking pulling device pulls the lever to rotate, the tongue piece abuts against the first pushing groove, and then drives the pawl assembly and the lock tongue assembly to achieve double-pull unlocking and separation.

[0022] Further, the novel double-pull unlocking mechanism described in the present application is used for the front hood lock or the rear compartment lock of an automobile.

[0023] Compared with the prior art, the novel double-pull unlocking mechanism described in the present invention has the following advantages:

[0024] (1) For the novel double-pull unlocking mechanism described in the present invention, through optimized design and innovative mechanism, the combined design of the lever and the tongue piece is introduced, and the movement of the pawl assembly and the separation process of the lock tongue assembly are decomposed into two steps, so that the meshing part of the pawl assembly and the lock tongue assembly does not need to be in contact throughout the unlocking process, thereby reducing the requirement for the Z-direction space, facilitating the realization of the compact design of the lock body, and at the same time reducing the direct meshing times and time between the pawl assembly and the lock tongue assembly, improving its wear resistance and extending its service life.

[0025] (2) For the novel double-pull unlocking mechanism described in the present invention, through the secondary pull-unlocking design of the lever and the tongue piece, the limitations of the prior art are effectively overcome, the service life and reliability of the hatch lock are significantly improved, and the service life requirement of up to 30,000-50,000 times of the hatch lock of an electric vehicle is met, so as to adapt to and promote the development needs of the automotive industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0027] Figure 1 is a schematic structural diagram of the novel double-pull manual unlocking mechanism according to an embodiment of the present invention;

[0028] Figure 2 is a schematic structural diagram of the lock tongue assembly and the pawl assembly in the fully locked state of the door lock according to an embodiment of the present invention;

[0029] Figure 3Schematic diagram of the structure where the lock tongue assembly and the pawl assembly of the embodiment of the present utility model are in the fully open state of the door lock;

[0030] Figure 4 Schematic diagram of the structure where the lock tongue assembly and the pawl assembly of the embodiment of the present utility model are in the half-locked state of the door lock;

[0031] Figure 5 Schematic diagram of the structure of the novel double-pull manual unlocking mechanism of the embodiment of the present utility model in the first manual unlocking state;

[0032] Figure 6 is Figure 5 Rear view structure diagram of the structure shown in

[0033] Figure 7 Schematic diagram of the structure of the novel double-pull manual unlocking mechanism of the embodiment of the present utility model in the second manual unlocking state;

[0034] Figure 8 is Figure 7 Rear view structure diagram of the structure shown in

[0035] Figure 9 Schematic diagram of the structure of the car door lock of the embodiment of the present utility model

[0036] Figure 10 is Figure 9 Exploded structure diagram of some parts in the structure shown in

[0037] Explanation of reference numerals:

[0038] 1 - Cover plate; 2 - Lock tongue assembly; 3 - Lock tongue rivet; 4 - Unlocking pulling device; 5 - Pawl rivet; 6 - First return torsion spring; 7 - Lever; 701 - First claw; 702 - First pawl; 8 - Tongue piece; 9 - Second return torsion spring; 10 - Third return torsion spring; 11 - Pawl assembly; 12 - First pushing groove; 13 - Limit post; 14 - First guiding groove; 15 - First hinge post; 16 - First guiding post. Detailed implementation manners

[0039] In order to make the technical means, achieved purpose and efficacy of the present utility model easy to understand, the embodiments of the present utility model will be described in detail below with reference to specific drawings.

[0040] It should be noted that all the terms indicating directionality and positionality in the present utility model, such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "top", "bottom", "lateral", "longitudinal", "center", etc., are only used to explain the relative positional relationship and connection situation between components under a certain specific state (as shown in the attached drawings), and are only for the convenience of describing the present utility model, rather than requiring the present utility model to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features.

[0041] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "installed", "connected", and "coupled" shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0042] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0043] In the context of the automotive industry's continuous pursuit of lightweight and convenience, the design and optimization of the front hood lock system have become an important direction for technological innovation. The traditional front hood unlocking process is not only cumbersome but also exposes users to the risks of contamination and scalding during operation, significantly affecting the user experience and safety. To address this challenge, a new front hood lock system solution that eliminates the safety hook structure and adopts a double-pull structure has emerged in the market. However, the existing double-pull structure mainly relies on the interlocking mechanism of the pawl and the lock tongue. Although this design is simple, it faces problems such as a relatively large Z-direction dimension, easy wear at the meshing position, and insufficient structural strength, resulting in a limited service life, generally less than 2500 times, and it is difficult to meet the growing long-term use requirements. Especially in the new trend that the electric vehicle hood lock has a storage function, a new requirement of up to 30,000 - 50,000 times for the service life of the hood lock, especially the front hood lock, has been put forward, and the existing front hood lock system far fails to meet its usage requirements.

[0044] In view of this, the present utility model aims to provide a novel double-pull unlocking structure, which is particularly applicable to the front hood lock or the rear compartment lock of an automobile, and includes:

[0045] An unlocking pulling device 4 for providing an external force or input power for pulling and unlocking;

[0046] A lever 7 that rotates under the action of the unlocking pulling device 4 and resets after losing force;

[0047] A tongue piece 8 that is hinged to the lever 7 and can rotate when the lever 7 rotates and reset when the lever 7 resets;

[0048] A pawl assembly 11 that is rotatably arranged. When it rotates, it disengages from the lock tongue assembly 2 according to the rotation direction, or abuts against the lock tongue assembly 2 to form an unlocking state and a full-lock state;

[0049] Wherein, when the pawl assembly 11 and the lock tongue assembly 2 are in the full-lock state for unlocking, when the unlocking pulling device 4 pulls the lever 7 to rotate, the lever 7 drives the pawl assembly 11 to move to a critical state or a state before disengaging from the lock tongue assembly 2 for the first unlocking; when the unlocking pulling device 4 resets and then pulls the lever 7 to rotate again, the tongue piece 8 drives the pawl assembly 11 to continue to move and disengage from the lock tongue assembly 2 for the second unlocking.

[0050] The novel double-pull unlocking structure disclosed in this application mainly includes key components such as an unlocking pulling device 4, a lever 7, a tongue piece 8, and a pawl assembly 11. When unlocking is required, the user provides an external force or input power through the unlocking pulling device 4 to drive the lever 7 to rotate. The lever 7 is ingeniously designed and can automatically reset after losing the external force, which provides the basis for double-pull unlocking. The tongue piece 8 is hinged to the lever 7, rotates with the rotation of the lever 7, and resets with the reset of the lever 7, playing a role in transmitting motion. The pawl assembly 11 is rotatably arranged and can selectively disengage from or abut against the lock tongue assembly 2 according to the direction during rotation, thereby realizing two states of unlocking and full locking. In the full-lock state, the first pull of the unlocking pulling device 4 will cause the lever 7 to drive the pawl assembly 11 to move to a critical state of disengaging from the lock tongue assembly 2; at this time, when the unlocking pulling device 4 loses force or resets, the lever 7 and the tongue piece 8 also perform reset actions. After that, when the unlocking pulling device 4 is pulled again, the tongue piece 8 will drive the pawl assembly 11 to continue to move, and finally achieve complete disengagement from the lock tongue assembly 2 to complete the unlocking process.

[0051] The novel double-pull unlocking structure described in this application, through optimized design and innovative mechanisms, introduces the combined design of the shift lever 7 and the tongue 8, and decomposes the movement of the pawl assembly 11 and the detachment process of the locking tongue assembly 2 into two steps. This enables the meshing part of the pawl assembly 11 and the locking tongue assembly 2 not to remain in contact throughout the unlocking process, thereby reducing the requirement for space in the Z direction, facilitating the compact design of the lock body, and at the same time reducing the direct meshing times and duration between the pawl assembly 11 and the locking tongue assembly 2, improving its wear resistance and extending its service life. The novel double-pull unlocking structure disclosed in this application, through the secondary pull-unlocking design of the shift lever 7 and the tongue 8, effectively overcomes the limitations of the prior art, significantly improves the service life and reliability of the hatch lock, meets the service life requirement of up to 30,000 - 50,000 times for the electric vehicle hatch lock, and adapts to and promotes the development needs of the automotive industry.

[0052] As a preferred example of this application, the shift lever 7 includes a first pulling claw 701 and a first shifting claw 702. The first pulling claw 701 is used to connect with the wire rope of the unlocking pulling device 4, and the first shifting claw 702 is used to push the pawl assembly 11 to move during the first unlocking. The first pulling claw 701 and the first shifting claw 702 are arranged at an angle along the rotation axis of the shift lever 7. As a more preferred example of this application, the value range of the angle formed between the first pulling claw 701 and the first shifting claw 702 is 60° - 150°. This setting discloses an optimized structure of the shift lever 7. The shift lever 7 is ingeniously designed to include two key parts: the first pulling claw 701 and the first shifting claw 702. These two parts each perform their own functions and jointly achieve the effective control and operation of the pawl assembly 11. The main task of the first pulling claw 701 is to connect with the wire rope of the unlocking pulling device 4. As a transmission medium, it is responsible for transmitting the force of the pulling device to the shift lever 7. The first shifting claw 702 is responsible for directly pushing the pawl assembly 11 to move during the first unlocking, thereby realizing the unlocking function. In addition, these two parts are not simply arranged side by side, but are ingeniously set at an angle along the rotation axis of the shift lever 7. This angle design enables the shift lever 7 to move more flexibly during the pulling process, while ensuring that the first pulling claw 701 and the first shifting claw 702 can effectively play their roles in their respective working processes.

[0053] Through the above optimization design of the structure of the shift lever 7, the unlocking operation becomes smoother and more efficient, ensuring the effective transmission of the pulling force, reducing energy loss, improving the reliability and stability of unlocking. At the same time, this design also helps to make the shift lever 7 more compact and reasonable in the overall structure, further enhancing its flexibility and adaptability during the unlocking process.

[0054] As a preferred example of the present application, the lever 7 is limited by the first return torsion spring 6, and the first return torsion spring 6 is used to reset the lever 7 when it loses force. In the example of the present application, the first return torsion spring 6 is arranged at the rotating shaft of the lever 7 and applies a force to the lever 7 in the direction opposite to the rotation direction when the unlocking pulling device 4 pulls. When the unlocking pulling device 4 pulls the lever 7 to rotate, it needs to overcome the force applied by the first return torsion spring 6 to the lever 7. When the unlocking pulling device 4 loses force or resets, the lever 7 returns to its original position under the action of the first return torsion spring 6. This setting discloses a reset mechanism for the lever 7. By introducing the first return torsion spring 6, the automatic reset function of the lever 7 is realized, bringing more stable, reliable and efficient operating performance to the unlocking system. It not only simplifies the operation process of the unlocking system, but also reduces the errors and failures that may occur due to manual reset, thereby improving the use experience and safety of the entire unlocking system.

[0055] As a preferred example of the present application, a limiting post 13 is arranged on the pawl assembly 11, and the limiting post 13 is used to abut and limit the first pawl 702 during the first unlocking movement. This design effectively prevents the first pawl 702 from excessive movement or deviation that may occur during the unlocking process by adding the limiting post 13 to provide abutting and limiting during the first unlocking movement of the first pawl 702, thereby avoiding potential jamming or failure risks, ensuring the accuracy and consistency of the unlocking movement, and making the unlocking system more durable and reliable.

[0056] As a preferred example of the present application, the tongue piece 8 is hinged and fixed on the first pawl 702, and a second return torsion spring 9 is arranged at the rotating shaft of the tongue piece 8. The second return torsion spring 9 is used to integrally hinge and fix the tongue piece 8 on the first pawl 702 and apply a force to reset the tongue piece 8 when the lever 7 resets.

[0057] This setting improves the smoothness and reliability of the unlocking operation by optimizing the design of the tongue piece 8 and its role in the unlocking mechanism. At the same time, the installation of the second return torsion spring 9 also ensures that the tongue piece 8 can automatically reset after unlocking, prepares for the next operation, improves the reliability of the unlocking mechanism, extends its service life, and enhances the performance and use experience of the entire unlocking mechanism.

[0058] As a preferred example of the present application, a first pushing groove 12 is arranged on the pawl assembly 11, and the first pushing groove 12 is used to abut and limit the tongue piece 8 during the second unlocking. This design ensures that the tongue piece 8 has a stable support point and force application direction when pushing the pawl assembly 11 to rotate, thereby improving the accuracy and reliability of unlocking, as well as the smoothness and user experience of unlocking.

[0059] In the example of this application, the first pushing groove 12 is arranged on the side of the limiting post 13 close to the rotating shaft of the lever 7. Through the above structural design, when the first unlocking is performed, the first pawl 702 will abut against the limiting post 13. Due to the position setting of the first pushing groove 12, the tongue piece 8 will not contact the first pushing groove 12 during the first unlocking process. The driving rotational force of the pawl assembly 11 during the first unlocking comes from the first pawl 702 of the lever 7. The interaction between the lever 7 and the pawl assembly 11 is both stable and reliable, laying a solid foundation for the subsequent unlocking steps. Immediately afterwards, the lever 7 and the tongue piece 8 are reset. During the second unlocking, since the pawl assembly 11 rotates during the first unlocking, the tongue piece 8 will accurately abut against the first pushing groove 12. This design enables the tongue piece 8 to push the pawl assembly 11 at an optimized angle and force, thereby driving the pawl assembly 11 to disengage from the locking tongue assembly 2 through double-pull unlocking. In the example of this application, the pawl assembly 11 and the locking tongue assembly 2 further include a semi-locked state on the verge of disengagement.

[0060] Since the position of the first pushing groove 12 is adjacent to the rotating shaft of the lever 7, this layout not only enhances the torque effect during unlocking, greatly improving the stability and reliability of the two unlocking processes and ensuring the coherence of the unlocking action.

[0061] In the example of this application, a first guiding post 16 is arranged on the tongue piece 8. When the lever 7 is forced to rotate, the tongue piece 8 is limited and guided by the second reset torsion spring 9 and the first guiding post 16. Under this limiting and guiding effect, the tongue piece 8 moves along a specific trajectory. During the first unlocking, the first pawl 702 abuts against the limiting post 13 arranged on the pawl assembly 11, and the tongue piece 8 never contacts the pawl assembly 11 during movement. The pawl assembly 11 is driven to rotate by the first pawl 702. Then, when the lever 7 and the tongue piece 8 are reset and the second unlocking is performed, at this time, the lever 7 is no longer in contact with the limiting post 13, and the tongue piece 8 abuts against the first pushing groove 12 on the pawl assembly 11. When the tongue piece 8 moves along a specific trajectory under the limiting action of the second reset torsion spring 9 and the first guiding post 16, it pushes the pawl assembly 11 to continue rotating, and then disengages from the locking tongue assembly 2 to achieve double-pull unlocking. In the example of this application, the first guiding post 16 is guided by the first guiding groove 14 on the cover plate 1.

[0062] The novel double-pull unlocking structure described in this application realizes the effective driving of the pawl assembly 11 and the smooth disengagement from the locking tongue assembly 2 through the division of labor and cooperation of the two unlocking steps. Combined with precise limiting and guiding designs, it further improves the performance of the entire unlocking mechanism and the user experience.

[0063] The novel double-pull unlocking structure described in this application abandons the traditional interlocking design, thus avoiding the large torque impact caused by the spring-up force during the double-pull process. This improvement greatly enhances the stability and durability of the structure. In addition, the novel double-pull unlocking structure has achieved a significant reduction in the Z-direction dimension. This optimization not only makes the overall layout of the door lock more flexible and convenient, but also greatly improves the service life of the door lock. Specifically, the novel double-pull unlocking structure can meet the service life requirements of the same use of 30,000 - 50,000 times for the front cabin and the rear trunk, fully demonstrating its excellent durability and reliability.

[0064] This application also discloses a car hood lock, including the novel double-pull unlocking structure described in the above embodiment. The car hood lock described in this application includes a locking tongue assembly 2, an unlocking pulling device 4, a lever 7, a tongue piece 8, a pawl assembly 11, and a cover plate 1. The locking tongue assembly 2 can rotate along the locking tongue rivet 3, and the pawl assembly 11 can rotate along the pawl rivet 5. A third return torsion spring 10 is arranged at the pawl rivet 5, and the third return torsion spring 10 is used to drive the pawl assembly 11 to reset. The lever 7 can rotate along the lever rotation shaft, and a first return torsion spring 6 is arranged on the lever rotation shaft. The first return torsion spring 6 is a lever torsion spring for resetting the lever 7. The tongue piece 8 is hinged and fixed on the first pawl 702 of the lever 7, that is, a first hinge column 15 is arranged on the first pawl 702, and one end of the tongue piece 8 is sleeved on the first hinge column 15. A second return torsion spring 9 is arranged on the first hinge column 15 for resetting the tongue piece 8. Other structures are similar to those of the car hood lock in the prior art and will not be described in detail here.

[0065] In the example of this application, in the first unlocking state, the unlocking pulling device 4 pulls the lever 7 to rotate counterclockwise. The first pawl 702 on the lever 7 pushes the pawl assembly 11 to rotate clockwise. In the example of this application, a limit post 13 is arranged on the pawl assembly 11 for the first pawl 702 to push against the limit post 13 to drive the pawl assembly 11 to rotate during the first unlocking. The engaging part on the pawl assembly 11 abuts against the limiting part on the locking tongue assembly 2 to make it rotate counterclockwise until the pawl assembly 11 and the locking tongue assembly 2 are rotated to a state of being about to disengage. Its movement structure is as Figure 5 、 Figure 6 shown. Then the unlocking pulling device 4 loses force, and the lever 7 returns to its original position under the action of the first return torsion spring 6. The tongue piece 8 arranged on the lever 7 returns to its original position under the action of the second return torsion spring 9. At this time, the novel double-pull unlocking structure described in this application completes the first unlocking, that is, unlocks the door lock to the half-lock position.

[0066] When the unlocking lever 7 is reset for the first time, if the unlocking pulling device 4 is pulled again at this time to drive the lever 7 to rotate, the tongue piece 8 slides along the first guiding groove 14 on the shielding cover plate 1 under the action of the second reset torsion spring 9, and the tongue piece 8 enters the meshing feature of the pawl assembly 11, that is, the tongue piece 8 abuts against the first pushing groove 12 on the pawl assembly 11. At this time, the unlocking pulling device 4 continues to pull to drive the lever 7 to rotate, driving the tongue piece 8 to push the pawl assembly 11 to rotate, so as to complete the separation of the pawl assembly 11 from the locking tongue assembly 2, complete the second unlocking, and realize the complete opening of the lock. As Figure 7 , Figure 8 shown in the process of the tongue piece 8 meshing with the pawl assembly 11 and pushing it to rotate.

[0067] After the unlocking is completed, the unlocking pulling device 4 loses force or resets, and the lever 7 and the tongue piece 8 return to their original positions, waiting to execute the next double-pull unlocking working condition.

[0068] The vehicle bonnet lock described in this application is mainly applied to the front bonnet lock or the rear compartment lock of a vehicle. Through the innovative non-intermeshing design and the Z-direction dimension reduction design by adopting a new double-pull unlocking structure, the service life of the door lock has been greatly improved and the overall layout has been optimized, bringing significant progress and practical value to the development of the door lock technology. The emergence of this new structure will undoubtedly bring a more stable, durable and easily arranged door lock solution for users, meeting the needs of various application scenarios.

[0069] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A novel double-pull unlocking mechanism, characterized in that: include: An unlocking pulling device (4) is used to provide an external force or input power for pulling and unlocking; A lever (7) which rotates under the action of the unlocking pulling device (4) and resets after losing force; A tongue piece (8) is hingedly arranged on the lever (7) and can rotate when the lever (7) rotates and reset when the lever (7) resets; The pawl assembly (11) is rotatably arranged, and when rotating, it is separated from the lock tongue assembly (2) or pressed against the lock tongue assembly (2) according to the rotation direction, thereby forming an unlocked state and a fully locked state; When unlocking in the fully locked state, the unlocking pulling device (4) pulls the lever (7) to rotate, and the lever (7) drives the pawl assembly (11) to move to a critical state of disengagement from the lock tongue assembly (2) or a state before disengagement, thereby completing the first unlocking; after the unlocking pulling device (4) is reset, the lever (7) is pulled again to rotate, and the tongue piece (8) drives the pawl assembly (11) to continue to move and disengage from the lock tongue assembly (2), thereby completing the second unlocking.

2. The novel double-pull unlocking mechanism according to claim 1 is characterized in that: The lever (7) comprises a first pulling claw (701) and a first pushing claw (702); the first pulling claw (701) is used to be connected to a pull line of an unlocking pulling device (4); the first pushing claw (702) is used to push the ratchet assembly (11) to move during the first unlocking; the first pulling claw (701) and the first pushing claw (702) are arranged at an angle along the rotating axis of the lever (7).

3. The novel double-pull unlocking mechanism according to claim 2 is characterized in that: The shifting rod (7) is limited in position under the action of a first return torsion spring (6), and the first return torsion spring (6) is used to return the shifting rod (7) when it loses force.

4. The novel double-pull unlocking mechanism according to claim 2 is characterized in that: A limiting column (13) is provided on the pawl assembly (11), and the limiting column (13) is used for abutting and limiting the first pawl (702) during the first unlocking movement.

5. The novel double-pull unlocking mechanism according to claim 4 is characterized in that: A first hinge column (15) is arranged on the first push claw (702), the tongue piece (8) is sleeved on the first hinge column (15), and a second reset torsion spring (9) is arranged on the first hinge column (15). The second reset torsion spring (9) is used to hinge and fix the tongue piece (8) on the first push claw (702) and exert a force to reset the tongue piece (8) when the push rod (7) is reset.

6. The novel double-pull unlocking mechanism according to claim 5 is characterized in that: A first push groove (12) is provided on the pawl assembly (11), and the first push groove (12) is used for the tongue piece (8) to push and limit when the tongue piece (8) is unlocked for the second time.

7. The novel double-pull unlocking mechanism according to claim 6 is characterized in that: The first push groove (12) is arranged on a side of the limiting column (13) close to the rotating shaft of the shifting rod (7).

8. The novel double-pull unlocking mechanism according to claim 5, characterized in that: A first guide column (16) is arranged on the tongue piece (8), and when the lever (7) is rotated under force, the tongue piece (8) is limited and guided by the second return torsion spring (9) and the first guide column (16) to move.

9. The novel double-pull unlocking mechanism according to any one of claims 1 to 8, characterized in that: During the first unlocking, the unlocking pulling device (4) pulls the lever (7) to rotate, the first pawl (702) on the lever (7) and the limiting column (13) are in contact with each other, and the tongue piece (8) is not in contact with the first push groove (12); after the first unlocking, the lever (7) and the tongue piece (8) are reset, and the pawl assembly (11) moves to a semi-locked state; during the second unlocking, the unlocking pulling device (4) pulls the lever (7) to rotate, the tongue piece (8) and the first push groove (12) are in contact with each other, thereby driving the pawl assembly (11) and the lock tongue assembly (2) to achieve double-pull unlocking and disengagement.

10. The novel double-pull unlocking mechanism according to any one of claims 1 to 9, characterized in that: Used for car hood lock or rear compartment lock.

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