CN113482460A - Can sink buffering formula aircraft bonnet lock - Google Patents

Abstract

The application relates to a sinkable buffer type hood lock, and relates to the technical field of auto parts. The cover body of the sinkable buffer type hood lock includes a first limit board and a second limit board. The first limit board is provided with a first limit slot, and the locking device includes a first locking unit and a second limit board. Two locking units, and the second locking unit is provided with a buffer assembly, the first limit slot is used to drive the plate assembly to move toward the cab when the active hinge bounces, and synchronously drives the lock to the direction of the cab When moving away from the second limit mainboard, it provides a buffer space for the lock to continue to move downward, and the buffer assembly is used to continue to move along the first limit slot with the assistance of the first locking unit and the second locking unit The lock is used to buffer and release energy. The hood lock provided by the present application solves the problems of high cost, many structural requirements on the lock and many restrictions on other structures when the hood lock and the active pop-up hinge are used in combination in the related art.

Description

A sinkable buffer type hood lock

technical field

The present application relates to the technical field of auto parts, in particular to a sinkable buffer type hood lock.

Background technique

With the rapid development of the automobile industry, the safety of driving and the protection of occupants have been greatly improved. However, in road traffic accidents, pedestrians are often the biggest victim group. The injured part of the accident has a high proportion of the head, so the structure of the car has been improved accordingly.

At present, due to the restrictions of pedestrian protection regulations and C-NCAP, the bottleneck parts of the front hood system of the car that affect the result of the head collision are mainly the hood lock and the hood hinge. In order to reduce the pedestrian head collision HIC value and improve the head collision To score, there are usually three mainstream measures: the first is to limit the distance between the nacelle interface and the outer panel of the hood to be greater than the given safe distance, that is, to passively ensure the crumpling space everywhere; When the distance between the outer panel of the cover is less than the given safety distance, the combination of the active pop-up hinge and the pop-up lock is added, that is, the collapse space is actively increased. That is, the use of the structural DMU safe space.

In the related art, the crumpling space is increased by raising the hood CAS surface directly above the hood lock part, but limited by the hard point of the connection between the lock and the lock, the gap between the hood panel assembly and the body cannot be utilized. movement safety clearance, and the styling largely makes concessions for lift handling at the expense of styling effects; there is also a combination of active pop-up hood locks and active pop-up hinges, however, active pop-up The hood lock often includes the entire active pop-up device, including the gunpowder explosive jacking device, the sensor and the lock body to destroy the jacked structure. The structure is complex and the cost is high. In addition, the active pop-up hinge is also a gunpowder explosive jacking. Therefore, when used together, there is a reliable stability factor of synchronous action, which cannot be reused; in addition, there is a collapsible lock. When the head touches, the lock is bent and deformed in the Z direction and moves downward to make use of the hard point of the engine room and the The DMU clearance of the plate assembly, but the use of the collapsible lock makes the overall Z direction of the plate assembly weak upward and downward, which will sacrifice the local strength performance of the plate lock, that is, the lock There is no plastic deformation in the Z-direction loading 1000N assembly and Z-direction loading 2500N assembly without damage, and the size of the collapse force is usually affected by the batch of materials and quality control, and it is difficult to guarantee, controllability and reliability Sex is poor.

SUMMARY OF THE INVENTION

The embodiments of the present application provide a sinkable buffer type hood lock, so as to solve the high cost, many structural requirements of the lock, and other structural restrictions when the hood lock in the related art is used in combination with an active pop-up hinge. many conditions.

In a first aspect, a sinkable buffer hood lock is provided, which includes:

a cover body, which includes a first limit board and a second limit board, and the first limit board is provided with a first limit slot;

The locking device is arranged between the first limit board and the second limit board, the locking device includes a first locking unit and a second locking unit, and the second locking unit is provided with There are buffer components; of which,

The first limit slot is used to drive the plate assembly to move in the direction of the cab when the active hinge pops up, and when the synchronously drives the lock to move in the direction of the cab and is separated from the second limit main board, it is The lock provides a buffer space for continuing to move downward, and the buffer assembly is used to counteract the buffering space that continues to move along the first limiting slot with the assistance of the first locking unit and the second locking unit. The lock is used for buffer release.

In some embodiments, the buffer assembly includes a buffer main spring, one end of the buffer main spring extends to form a fixing section, the fixing section is used to fix the buffer main spring and the second locking unit, and the other end extends to form a buffer section , the buffer segment is at least partially coincident with the projection of the first limiting groove along the vertical plane, and the horizontal plane where the lowest point of the buffer segment is located and the horizontal plane where the bottom surface of the first limiting groove is located is between The height difference between them is not less than the preset height value.

In some embodiments, the second limiting main board is provided with a second limiting groove, and the horizontal plane where the bottom of the second limiting groove is located is higher than the horizontal plane where the bottom of the first limiting groove is located, The second limiting groove is used to assist the first locking unit and the second locking unit after the first locking unit and the second locking unit jointly perform the primary locking of the lock catch Perform secondary locking on the lock.

In some embodiments, the buffer assembly further includes a limiter, the limiter is arranged on the second locking unit and is abutted against the buffer section, and the limiter is used for limiting The position of the buffer segment is such that the highest point of the partial segment of the buffer segment and the projection of the first limiting groove along the vertical plane is not higher than the bottom of the second limiting groove.

In some embodiments, the first locking unit includes a main card board, the main card plate includes a locking groove and a limit portion, the locking groove is used for hooking on the lock, the limit The position part includes a first limit bump and a second limit bump from bottom to top, and the first limit bump is used to be mutually clamped with the second locking unit to perform a first-level lock on the lock. For locking, the second limiting protrusion is used for mutual clamping with the second locking unit to perform secondary locking on the lock.

In some embodiments, the second locking unit includes:

A limit pull plate, which includes a third limit bump, the third limit bump is used to be mutually clamped with the first limit bump and the second limit bump respectively, so as to assist the lock The locking grooves respectively perform primary locking and secondary locking on the lock;

A reset main spring, one end of which is connected to the first limit main board, and the other end is connected to the limit pull plate, and the reset main spring is used to assist the third limit bump to be respectively connected to the first limit The positioning bump and the second limiting bump realize the clamping and positioning.

In some embodiments, the bottom of the limiting pull plate is provided with a first connecting portion and a second connecting portion from bottom to top, and the first connecting portion is provided at a position of the limiting pull plate away from the return main spring. side, and is used to connect the unlocking rope to release the clamping between the third limit bump, the first limit bump and the second limit bump, and the second connection part corresponds to the reset main spring end connected.

In some embodiments, the side of the limit pull plate away from the third limit bump is provided with a fourth limit bump, and the fourth limit bump is used to connect with the first limit motherboard. The side walls of the joints work together to limit the rotation angle of the limit pull plate when it is unlocked.

In some embodiments, the preset height value ranges from 8 to 12 mm.

In some embodiments, both the first limiting groove and the second limiting groove are provided with a flanging structure toward the outside.

The beneficial effects brought by the technical solution provided by this application include:

The embodiment of the present application provides a sinkable buffer type hood lock. When the active hinge pops up, the plate assembly is driven to move toward the cab, and the lock catch is synchronously driven to move toward the cab to escape from the second limit position. When the main board is used, the hood lock provides an effective sinking buffer space for the lock by setting the first limit slot to continue to move downward, and at the same time, a buffer component is set, so that the lock is separated from the second limit main board. Control the support force to buffer and release the energy of the lock that continues to move along the first limit slot, realize synchronization with the active hinge, and make full use of the DMU safety gap between the panel assembly at the hood lock and the hard point of the cabin to Energy-absorbing buffer reduces damage value. The hood lock has a simple structure, low cost, no damage to the structure after collision, high reliability, and can be reused. It can ensure that the strength of the corresponding part of the lock meets the performance requirements, and it can also ensure that it works synchronously with the active hinge. It can realize the controllable subsidence amount and buffer force, so as to convert the DMU space into a collapse space, realize the transformation of unfavorable conditions into favorable conditions, reduce the restrictive conditions on its own shape, and the structural design is ingenious.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is an exploded view of a sinkable buffer type hood lock provided by an embodiment of the present application;

2 is a schematic diagram of the internal structure of the sinkable buffer type hood lock provided by the embodiment of the present application;

3 is a side view of a sinkable buffer type hood lock provided by an embodiment of the present application;

4 is a schematic diagram of the internal structure of the sinkable buffer hood lock provided in an embodiment of the present application when it is in an unlocked state;

5 is a schematic diagram of the internal structure of the sinkable buffer type hood lock provided in an embodiment of the present application when it is in a first-level locking state;

6 is a schematic diagram of the internal structure of the sinkable buffer type hood lock provided in an embodiment of the application when it is in a secondary locking state;

7 is a side view of the sinkable buffer type hood lock provided in an embodiment of the present application when it is in a secondary locking state;

8 is a schematic diagram of the internal structure of the sinkable buffer hood lock provided by an embodiment of the application when the active hinge is raised;

FIG. 9 is a schematic structural diagram of the sinkable buffer type hood lock provided in an embodiment of the present application when it is in a buffer sink state.

In the figure: 1-cover, 10-first limit board, 11-second limit board, 12-first limit slot, 13-second limit slot, 2-locking device, 20-first Locking unit, 200-main card board, 201-fixed main spring, 202-locking groove, 203-first limit bump, 204-second limit bump, 21-second locking unit, 210- Limit pull plate, 211-third limit bump, 212-first connection part, 213-second connection part, 214-fourth limit bump, 215-return main spring, 3-lock buckle, 4- Buffer assembly, 40-buffer main spring, 400-fixed section, 401-buffer section, 41-limiting piece, 50-left bushing, 51-right bushing, 60-left rivet shaft, 61-right rivet shaft.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present application.

The embodiment of the present application provides a sinkable buffer type hood lock, which can solve the problem of high cost, many restrictions on the structure of the lock when the hood lock in the related art is used in combination with an active pop-up hinge, and other problems. Problems with many structural constraints.

Referring to FIG. 1 and FIG. 2 , the cover lock of the machine mainly includes a cover body 1 and a locking device 2 , wherein the cover body 1 includes a first limit main board 10 and a second limit main board 11 . The first limit main board 10 There is a first limit slot 12 on it, the locking device 2 is arranged between the first limit motherboard 10 and the second limit motherboard 11 , and the locking device 2 includes a first locking unit 20 and a second locking unit 21 , and the first locking unit 20 and the second locking unit 21 are respectively fixed between the first limiting motherboard 10 and the second limiting motherboard 11 , and the second locking unit 21 is provided with a buffer assembly 4 . Among them, the first limit slot 12 is used to drive the plate assembly to move in the direction of the cab when the active hinge pops up, and the lock catch 3 is synchronously driven to move in the direction of the cab and is separated from the second limit main board 11. The buckle 3 provides a buffer space for continuing downward movement, and the buffer assembly 4 is used to buffer and release the lock buckle 3 that continues to move along the first limiting groove 12 with the assistance of the first locking unit 20 and the second locking unit 21 . can.

Specifically, as shown in Figures 5-6, the hood lock can perform normal primary locking and secondary locking, that is, semi-locking and locking, because for safety reasons, it is stipulated that the hood of the car must have two locks . When a collision occurs, as shown in Figures 8-9, the active hinge will bounce up, and after it bounces, it will drive the plate assembly to move toward the cab as a whole. Therefore, at this time, the lock catch 3 will also move toward the direction close to the cab under the driving of the plate assembly, and enter the buffer sinking state. Before the movement, the lock catch 3 is erected on the first limit board 10 and the second limit board 11 . After the movement, the lock 3 is separated from the second limit board 11 and is only in contact with the first limit board 10 . The projection on the horizontal plane has an overlapping area. Correspondingly, due to the setting of the first limit slot 12 , it can just provide the buffer space for the lock 3 to continue to move downward. At the same time, the buffer assembly 4 provides the lock 3 with a buffer space. The supporting force can be controlled to buffer and release the energy of the lock 3 that continues to move along the first limit groove 12 . When the head shape leaves, the lock 3 and the plate assembly return to the position under the force of the buffer component 4 . Secondary locked state. Through the ingenious arrangement of the first limit slot 12 and the buffer assembly 4, the hood lock realizes the transformation of the DMU space into a crumpling space, thereby increasing the crumpling space and improving the pedestrian protection head-collision score. In addition, it is different from the related art. When the DMU space needs to be used, there is a settlement process, so there are great requirements and restrictions on the structure of the hood lock itself. While effectively improving the crumpling space, it also simplifies the structure of the hood lock itself, and achieves the purpose of repeated use.

Further, the buffer assembly 4 includes a buffer main spring 40 , one end of the buffer main spring 40 extends to form a fixed section 400 , the fixed section 400 is used to fix the buffer main spring 40 and the second locking unit 21 , and the other end extends to form a buffer section 401 . The segment 401 at least partially overlaps with the projection of the first limiting slot 12 along the vertical plane, so as to ensure that at least a part of the segment 401 can provide support for the locking catch 3 after the locking catch 3 is driven away from the second limiting main board 11 . In addition, the height difference between the horizontal plane where the lowest point of the buffer section 401 is located and the horizontal plane where the bottom surface of the first limiting groove 12 is located is not less than the preset height value. Realize buffer release.

Further, as shown in FIG. 7 , the second limiting main board 11 is provided with a second limiting slot 13 , and the bottom of the second limiting slot 13 is located at a higher level than the bottom of the first limiting slot 12 . On the horizontal plane, the second limiting groove 13 is used to assist the first locking unit 20 and the second locking unit 21 after the first locking unit 20 and the second locking unit 21 jointly perform the primary locking of the lock catch 3 Perform secondary locking on the lock catch 3. Specifically, the first limit slot 12 and the second limit slot 13 are respectively located on the first limit board 10 and the second limit board 11, and the positions of the two correspond to each other. The second limit slot 13 mainly realizes In the positioning of the secondary locking, the bottom of the first limit slot 12 is lower than the bottom of the second limit slot 13, and the drop between the two can achieve an effective sinking amount to provide space for the lock 3 to continue to move downward. 3, the height difference A between the first limiting groove 12 and the second limiting groove 13 is the effective sinking amount.

Further, in order to prevent the setting of the buffer main spring 40 from affecting the previous primary locking and secondary locking, therefore, the buffer assembly 4 further includes a limiting member 41 , and the limiting member 41 is provided on the second locking unit 21 on top of the buffer section 401, and abutting against the buffer section 401. The limiter 41 is used to limit the position of the buffer section 401, so that the highest point of the partial section where the buffer section 401 and the projection of the first limit groove 12 along the vertical plane overlap. not higher than the bottom of the second limiting groove 13 . Specifically, the limiting member 41 is a rod-shaped structure. Since the buffer section 401 itself has a certain deformability, the limiting member 41 is vertically fixed on the second locking unit 21 , and its rod body is against the buffer section 401 . , which acts as a lower pressure limiter.

Further, as shown in FIGS. 3-5 , the first locking unit 20 mainly includes a main card board 200 and a fixed main spring 201 , wherein the main card plate 200 includes a locking groove 202 and a limit portion, and the lock catch 3 itself It is U-shaped, and its closed end is used for locking with the hood lock, so the locking groove 202 is used to hook on the closed end of the lock buckle 3; the limiting part includes a first limiting protrusion 203 from bottom to top and the second limit bump 204, the first limit bump 203 is used for mutual locking with the second locking unit 21 to perform first-level locking of the lock 3, and the second limit bump 204 is used for the first limit bump 204. The two locking units 21 are locked with each other to perform secondary locking of the lock catch 3 , and the fixed main spring 201 is used to provide a restoring force to the main card board 200 , that is, with the rotation of the main card board 200 , the fixed main spring 201 will Corresponding deformation occurs, and a restoring force is applied thereto, which is used for restoring the main card board 200 .

Further, the second locking unit 21 mainly includes a limit pull plate 210 and a reset main spring 215, the limit pull plate 210 includes a third limit bump 211, and the third limit bump 211 is used to connect with the first limit block respectively. The positioning bumps 203 and the second limiting bumps 204 are locked with each other, and the auxiliary locking grooves 202 respectively perform primary locking and secondary locking on the lock catch 3 . Here, the third limiting bump 211 is similar to the top angle structure, and its included angle tends to be 90°, and the first limiting bump 203 is elongated. The 200 rotates around the fixed main spring 201. When the first limit bump 203 moves to the bottom of the third limit bump 211, it and the third limit bump 211 can be locked with each other, so as to lock the hood. First-level locking with lock catch 3. The shape of the second limiting bump 204 is similar to that of the third limiting bump 211 , but the angle of the top angle is smaller than that of the third limiting bump 211 . After the first-level locking is achieved, the lock catch 3 continues to move downward. The main card board 200 continues to rotate synchronously around the fixed main spring 201 under the drive of To achieve the secondary locking of the hood lock and the lock catch 3.

Further, one end of the reset main spring 215 is connected to the first limit main board 10, and the other end is connected to the limit pull plate 210. The reset main spring 215 is used to assist the third limit bumps 211 to connect with the first limit bumps respectively. 203 and the second limiting bump 204 realize the snap-fit positioning. Specifically, the reset main spring 215 is arranged below the first limit main board 10 and the second limit main board 11, and its function is similar to the fixed main spring 201 to a certain extent, which enables the limit pull plate 210 to rotate flexibly, and To help the limit pull plate 210 to reset, because the limit pull plate 210 is always subjected to the restoring force of the reset main spring 215 during the rotation process, so that it can cooperate with the main card board 200 .

Further, in order to facilitate the remote secondary locking and unlocking of the hood lock, a first connecting portion 212 and a second connecting portion 213 are provided at the bottom of the limiting pull plate 210 from bottom to top, and the first connecting portion 212 It is located on the side of the limit pull plate 210 away from the reset main spring 215, and is used to connect the unlocking rope. The unlocking rope is a very thin wire rope, which extends all the way to the cab, so that the driver can directly pull it to release the third limit. The locking between the bump 211 and the first limiting bump 203 and the second limiting bump 204 is generally only used to unlock the secondary locking, and the primary locking is outside the vehicle and directly lifts the cover by hand. can be unlocked. The purpose of the second connecting portion 213 is mainly to connect with the corresponding end of the return main spring 215 .

Further, referring to FIG. 4 , the first limiting main board 10 and the second limiting main board 11 are similar to the structure of interlocking, therefore, the peripheral edges of the first limiting main board 10 and the second limiting main board 11 are close to the object. The direction of the extension is provided with a convex edge. Wherein, the side of the limit pull plate 210 away from the third limit bump 211 is provided with a fourth limit bump 214 , and the fourth limit bump 214 is used to cooperate with the side wall of the first limit motherboard 10 . That is, it is pressed against the convex edge to limit the rotation angle of the limiting pull plate 210 when it is unlocked. Similarly, the upper half structure of the limiting pull plate 210 also bears on the convex edge when it is unlocked.

Further, the value range of the preset height value is 8-12 mm. In addition, since the lock catch 3 will impact the first limit slot 12 and the second limit slot 13 to a certain extent when it continues to move downward, in order to protect the structure from damage, the first limit slot 12 and the second limit slot 13 The position grooves 13 are all provided with a flanging structure toward the outside, which can effectively increase the structural strength.

Further, a left bushing 50 is arranged between the main card board 200 and the fixed main spring 201 , a right bushing 51 is arranged between the limit pull plate 210 and the buffer main spring 40 , the main card plate 200 and the fixed main spring 201 , The left bushing 50 is fixed on the first limit main board 10 and the second limit main board 11 through the left riveting shaft 60, and the limit pull plate 210, the buffer main spring 40 and the right bushing 51 pass through the right riveting shaft. 61 is fixed on the first limit board 10 and the second limit board 11 .

By setting the first limit slot 12 and the second limit slot 13 with different heights and lengths, the hood lock utilizes the height difference between the two to achieve an effective sinking space, and the active hinge bounces up to drive the plate assembly toward the When the direction of the cab moves, the synchronous driving lock 3 moves in the direction of the cab and is separated from the second limit main board 11, the buffer main spring 40 provides a controllable support force for the lock 3 that has separated from the second limit main board 11, Buffer and release energy for the lock catch 3 that continues to move along the first limit slot 12 to achieve synchronization with the active hinge and make full use of the DMU safety gap between the panel assembly at the hood lock and the hard point of the nacelle to absorb energy Buffer reduces damage value. In addition, unlike the related art, when the DMU space needs to be used, there is a settling process, so there are great requirements and restrictions on the structure of the hood lock itself, the manufacturing difficulty and cost are high, and the hood lock uses the original disadvantage. conditions, and convert them into favorable conditions for utilization, while effectively increasing the crumpling space, it also simplifies the structure of the hood lock itself, and achieves the purpose of repeated use.

In the description of this application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the application and simplifying the description, Rather than indicating or implying that the referred device or element must have a particular orientation, be constructed and operate in a particular orientation, it should not be construed as a limitation on the application. Unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood 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 can also be an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply Any such actual relationship or sequence exists between these entities or operations. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

The above descriptions are only specific embodiments of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, this application is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims (10)

1. A retractable buffer hood lock, comprising:

the mask body (1) comprises a first limiting main board (10) and a second limiting main board (11), wherein a first limiting groove (12) is formed in the first limiting main board (10);

the locking device (2) is arranged between the first limiting main board (10) and the second limiting main board (11), the locking device (2) comprises a first locking unit (20) and a second locking unit (21), and a buffer assembly (4) is arranged on the second locking unit (21); wherein,

the first limiting groove (12) is used for driving the plate assembly to move towards the direction of a cab in a bouncing mode through the driving hinge, the lock catch (3) is driven to move towards the direction of the cab synchronously to be separated from the second limiting main plate (11), a buffer space which continues to move downwards is provided for the lock catch (3), and the buffer component (4) is used for buffering and releasing the energy of the lock catch (3) which continues to move along the first limiting groove (12) under the assistance of the first locking unit (20) and the second locking unit (21).

2. A retractable cushioned hood lock as set forth in claim 1, wherein: the buffer assembly (4) comprises a buffer main spring (40), one end of the buffer main spring (40) extends to form a fixing section (400), the fixing section (400) is used for fixing the buffer main spring (40) and the second locking unit (21), the other end of the buffer main spring extends to form a buffer section (401), at least part of the buffer section (401) is overlapped with the projection of the first limit groove (12) along the vertical surface, and the height difference between the horizontal plane where the lowest point of the buffer section (401) is located and the horizontal plane where the bottom surface of the first limit groove (12) is located is not smaller than a preset height value.

3. A retractable cushioned hood lock as set forth in claim 2, wherein: the second limiting main board (11) is provided with a second limiting groove (13), the horizontal plane of the bottom of the second limiting groove (13) is higher than the horizontal plane of the bottom of the first limiting groove (12), and the second limiting groove (13) is used for assisting the first locking unit (20) and the second locking unit (21) in performing secondary locking on the lock catch (3) after the first locking unit (20) and the second locking unit (21) perform primary locking on the lock catch (3).

4. A retractable cushioned hood lock as set forth in claim 3, wherein: the buffer assembly (4) further comprises a limiting piece (41), the limiting piece (41) is arranged on the second locking unit (21) and abutted against and attached to the buffer section (401), and the limiting piece (41) is used for limiting the position of the buffer section (401), so that the highest point of a partial section of the buffer section (401) which is overlapped with the first limiting groove (12) along the projection of the vertical surface is not higher than the bottom of the second limiting groove (13).

5. A retractable cushioned hood lock as set forth in claim 1, wherein: the first locking unit (20) comprises a main clamping plate (200), the main clamping plate (200) comprises a locking groove (202) and a limiting part, the locking groove (202) is used for hooking the lock catch (3), the limiting part comprises a first limiting lug (203) and a second limiting lug (204) from bottom to top, the first limiting lug (203) is used for being mutually clamped and fixed with the second locking unit (21) to carry out primary locking on the lock catch (3), and the second limiting lug (204) is used for being mutually clamped and fixed with the second locking unit (21) to carry out secondary locking on the lock catch (3).

6. A retractable cushioned hood lock according to claim 5, wherein said second lock unit (21) comprises:

the limiting pull plate (210) comprises a third limiting bump (211), and the third limiting bump (211) is used for being clamped and fixed with the first limiting bump (203) and the second limiting bump (204) respectively so as to assist the locking groove (202) to perform primary locking and secondary locking on the lock catch (3) respectively;

and one end of the main reset spring (215) is connected with the first limiting main board (10), the other end of the main reset spring is connected with the limiting pulling plate (210), and the main reset spring (215) is used for assisting the third limiting convex block (211) to be respectively clamped and positioned with the first limiting convex block (203) and the second limiting convex block (204).

7. A retractable cushioned hood lock as set forth in claim 6, wherein: the bottom of the limiting pulling plate (210) is provided with a first connecting part (212) and a second connecting part (213) from bottom to top, the first connecting part (212) is arranged on one side, away from the main reset spring (215), of the limiting pulling plate (210) and used for being connected with an unlocking rope so as to release clamping between the third limiting convex block (211) and the first limiting convex block (203) and the second limiting convex block (204), and the second connecting part (213) is connected with the corresponding end of the main reset spring (215).

8. A retractable cushioned hood lock as set forth in claim 6, wherein: and a fourth limiting convex block (214) is arranged on one side, away from the third limiting convex block (211), of the limiting pull plate (210), and the fourth limiting convex block (214) is used for coacting with the side wall of the first limiting main plate (10) to limit the rotation angle of the limiting pull plate (210) during unlocking.

9. A retractable cushioned hood lock as set forth in claim 2, wherein: the value range of the preset height value is 8-12 mm.

10. A retractable cushioned hood lock as set forth in claim 1, wherein: and the first limiting groove (12) and the second limiting groove (13) are both provided with flanging structures towards the outer side.

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