CN113482460A

CN113482460A - Can sink buffering formula aircraft bonnet lock

Info

Publication number: CN113482460A
Application number: CN202110736345.3A
Authority: CN
Inventors: 杨飘; 王伟; 左军锋; 苑雪丽; 戴乐宏
Original assignee: Dongfeng Motor Corp
Current assignee: Lantu Automobile Technology Co Ltd
Priority date: 2021-06-30
Filing date: 2021-06-30
Publication date: 2021-10-08
Anticipated expiration: 2041-06-30
Also published as: CN113482460B

Abstract

The application relates to a buffering formula aircraft bonnet lock can sink relates to automobile parts technical field. This cover body of buffering formula aircraft bonnet lock can sink includes first spacing mainboard and the spacing mainboard of second, be equipped with first spacing groove on the first spacing mainboard, closure equipment includes first locking unit and second locking unit, and be equipped with the buffering subassembly on the second locking unit, first spacing groove is used for springing up at the initiative hinge and drives the direction removal of plate assembly towards the driver's cabin, when the direction removal of synchronous drive hasp towards the driver's cabin breaks away from the spacing mainboard of second, provide the buffering space that continues to move downwards for the hasp, the buffering subassembly is used for buffering the hasp that continues to move along first spacing groove under the assistance of first locking unit and second locking unit and releases the ability. The hood lock solves the problems that the cost is high, structural requirements on the lock are limited and other structural limiting conditions are limited when the hood lock and the active pop-up hinge in the related art are combined for use.

Description

Can sink buffering formula aircraft bonnet lock

Technical Field

The application relates to the technical field of automobile parts, in particular to a sinking buffering type hood lock.

Background

With the rapid development of the automobile industry, the driving safety and the passenger protection are greatly improved at present, but in a road traffic accident, pedestrians are often the largest victimized group, and statistics show that the head of the part of the pedestrian injured by the traffic accident is higher, so that the structure of the automobile is correspondingly improved.

At present, under the limitation of pedestrian protection laws and regulations and C-NCAP, the bottleneck part of an automobile front hood system influencing the head collision result is mainly the hood lock part and the hood hinge part, and in order to reduce the HIC value of the head collision of pedestrians and improve the head score, three main measures are usually adopted: the first is for limiting the cabin interface piece to be greater than given safe distance to the aircraft bonnet planking, guarantees the routed space everywhere passively promptly, and the second is when the cabin interface is less than given safe distance to the aircraft bonnet planking distance, increases the combination of initiative bounce-type hinge and bounce-type lock, and the space of initiatively enlarging routed promptly, and the third is for adopting the formula of collapsing hasp or the formula of collapsing lock, utilizes structure DMU safe space promptly.

In the related art, the collapse space is enlarged by raising the CAS surface of the hood right above the hood lock part, but the movement safety gap between the hood plate assembly and the vehicle body cannot be utilized due to the limitation of the hard point of the lock and the lock catch, and in addition, the modeling gives way for the lifting treatment to a great extent, and the modeling effect is sacrificed; in addition, the active bounce type hood lock is also a gunpowder type explosion jacking structure, so that a synchronous actuation reliable stability coefficient exists when the active bounce type hood lock is matched with a lock body, and the lock body cannot be reused; in addition, the crush type lock catch is adopted, when the head is collided, the lock catch is bent in the Z direction and deforms and moves downwards to utilize a DMU gap between a cabin hard point and the plate assembly, but the whole Z direction of the plate assembly is weak in strength both upwards and downwards due to the application of the crush type lock catch, so that the local strength performance of the plate lock catch is sacrificed, namely the lock catch meshing point Z direction loading 1000N assembly is not plastically deformed and the Z direction loading 2500N assembly is not damaged, the size of the crush force is generally greatly influenced by material batches and quality control, the fluctuation is difficult to guarantee, and the controllability and the reliability are poor.

Disclosure of Invention

The embodiment of the application provides a but buffer type aircraft bonnet lock sinks to when solving aircraft bonnet lock among the correlation technique and the combination of initiative bounce-type hinge and using the cost higher, to the structural requirement restriction of lock many and to the many problems of other structural restrictions.

In a first aspect, there is provided a retractable cushioned hood lock comprising:

the mask body comprises a first limiting main board and a second limiting main board, wherein a first limiting groove is formed in the first limiting main board;

the locking device is arranged between the first limiting main board and the second limiting main board and comprises a first locking unit and a second locking unit, and a buffer assembly is arranged on the second locking unit; wherein the content of the first and second substances,

the first limiting groove is used for providing a buffer space for the lock catch to continuously move downwards when the driving hinge bounces to drive the plate assembly to move towards the direction of the cab and the lock catch is synchronously driven to move towards the direction of the cab to be separated from the second limiting main board, and the buffer component is used for buffering and releasing the lock catch continuously moving along the first limiting groove under the assistance of the first locking unit and the second locking unit.

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

In some embodiments, a second limiting groove is formed in the second limiting main board, a horizontal plane where the bottom of the second limiting groove is located is higher than a horizontal plane where the bottom of the first limiting groove is located, and the second limiting groove is used to assist the first locking unit and the second locking unit in performing secondary locking on the lock after the first locking unit and the second locking unit perform primary locking on the lock together.

In some embodiments, the buffering assembly further includes a limiting member, the limiting member is disposed on the second locking unit and abuts against the buffering section, and the limiting member is configured to limit the position of the buffering section, so that a highest point of a partial section where projections of the buffering section and the first limiting groove along a vertical plane are overlapped is not higher than a bottom of the second limiting groove.

In some embodiments, the first locking unit includes a main locking plate, the main locking plate includes a locking groove and a limiting portion, the locking groove is configured to hook on the lock catch, the limiting portion includes, from bottom to top, a first limiting protrusion and a second limiting protrusion, the first limiting protrusion is configured to be mutually fastened with the second locking unit to perform primary locking on the lock catch, and the second limiting protrusion is configured to be mutually fastened with the second locking unit to perform secondary locking on the lock catch.

In some embodiments, the second locking unit comprises:

the limiting pull plate comprises a third limiting lug, and the third limiting lug is used for being mutually clamped and fixed with the first limiting lug and the second limiting lug respectively so as to assist the locking groove to carry out primary locking and secondary locking on the lock catch respectively;

and one end of the reset main spring is connected with the first limiting main board, the other end of the reset main spring is connected with the limiting pulling plate, and the reset main spring is used for assisting the third limiting lug to be clamped and positioned with the first limiting lug and the second limiting lug respectively.

In some embodiments, a first connecting portion and a second connecting portion are disposed at the bottom of the limiting pulling plate from bottom to top, the first connecting portion is disposed at a side of the limiting pulling plate away from the main return spring and is used for connecting an unlocking rope to release the third limiting protrusion from being clamped between the first limiting protrusion and the second limiting protrusion, and the second connecting portion is connected to the corresponding end of the main return spring.

In some embodiments, a fourth limiting bump is disposed on a side of the limiting pull plate away from the third limiting bump, and the fourth limiting bump is configured to cooperate with a side wall of the first limiting main plate to limit a rotation angle of the limiting pull plate when the limiting pull plate is unlocked.

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

In some embodiments, the first limiting groove and the second limiting groove are both provided with a flanging structure towards the outer side.

The beneficial effect that technical scheme that this application provided brought includes:

the embodiment of the application provides a but buffer formula aircraft bonnet lock sinks, bounce at initiative hinge and drive the direction removal of plate assembly towards the driver's cabin, when the direction removal of synchronous drive hasp towards the driver's cabin and break away from the spacing mainboard of second, this aircraft bonnet lock provides effectively to sink the buffer space for the hasp through setting up first spacing groove and removes in order to continue downwards, and set up buffer unit simultaneously, make the hasp provide controllable holding power for the hasp after breaking away from the spacing mainboard of second, in order to cushion the release ability to the hasp that continues to remove along first spacing groove, realize with initiative hinge synchronous and make full use of plate assembly DMU safety gap between aircraft bonnet lock department and cabin hard spot come the energy-absorbing buffering to reduce the injury value. This aircraft bonnet lock's simple structure, with low costs, the collision back structure can not destroyed, and the reliability is high, repeatedly usable, when can guaranteeing that the intensity that hasp department corresponds the position meets the performance requirement, can also guarantee to actuate with initiative hinge synchronization, and realization sinkage and buffer force size are controllable to turn into the space that contracts of ulcerating with the DMU space, realize becoming the advantage with unfavorable condition, reduced the figurative restriction condition to self, structural design is ingenious.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is an exploded view of a retractable cushioned hood lock according to an embodiment of the present application;

FIG. 2 is a schematic diagram of an internal structure of a retractable cushioned hood lock according to an embodiment of the present disclosure;

FIG. 3 is a side view of a retractable cushioned hood lock according to an embodiment of the present application;

fig. 4 is a schematic view of an internal structure of a retractable buffering type hood lock provided by an embodiment of the present application in an unlocked state;

fig. 5 is a schematic diagram of an internal structure of a retractable buffering type hood lock provided by an embodiment of the present application in a primary locking state;

FIG. 6 is a schematic diagram of the internal structure of the subsidable buffering type hood lock in the secondary locking state according to the embodiment of the present application;

FIG. 7 is a side view of a subsidable bumper hood lock in a secondary locking configuration according to an embodiment of the present application;

FIG. 8 is a schematic view of the internal structure of the retractable cushioned hood lock of the present application when the active hinge is sprung;

fig. 9 is a schematic structural view of the subsidable buffer type hood lock according to the embodiment of the present application in a buffer subsiding state.

In the figure: 1-cover body, 10-first limit mainboard, 11-second limit mainboard, 12-first limit groove, 13-second limit groove, 2-locking device, 20-first locking unit, 200-main clamping plate, 201-fixed main spring, 202-locking groove, 203-first limit lug, 204-second limit lug, 21-second locking unit, 210-limit pulling plate, 211-third limit lug, 212-first connecting part, 213-second connecting part, 214-fourth limit lug, 215-reset main spring, 3-lock catch, 4-buffer component, 40-buffer main spring, 400-fixed segment, 401-buffer segment, 41-limit piece, 50-left bush, 51-right bush, 60-left riveting shaft, and 61-right riveting shaft.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The embodiment of the application provides a but buffering formula aircraft bonnet lock sinks, and it can solve the aircraft bonnet lock among the correlation technique and the problem that the structure requirement restriction of lock is many and many to other structure restriction conditions when initiatively bounced formula hinge combination uses with higher cost.

Referring to fig. 1 and 2, the hood lock mainly includes a hood body 1 and a locking device 2, wherein the hood body 1 includes a first limiting main board 10 and a second limiting main board 11, a first limiting groove 12 is formed in the first limiting main board 10, the locking device 2 is disposed between the first limiting main board 10 and the second limiting main board 11, the locking device 2 includes a first locking unit 20 and a second locking unit 21, the first locking unit 20 and the second locking unit 21 are respectively and fixedly disposed between the first limiting main board 10 and the second limiting main board 11, and a buffer assembly 4 is disposed on the second locking unit 21. The first limiting groove 12 is used for providing a buffer space for the lock catch 3 to continuously move downwards when the driving hinge bounces to drive the plate assembly to move towards the cab and the lock catch 3 is synchronously driven to move towards the cab to be separated from the second limiting main board 11, and the buffer component 4 is used for buffering and releasing the lock catch 3 continuously moving along the first limiting groove 12 under the assistance of the first locking unit 20 and the second locking unit 21.

Specifically, referring to fig. 5-6, the hood lock allows for normal primary and secondary locking, i.e., half-locking and latching, since for safety reasons, it is specified that the hood of the vehicle must have two locks. When a collision occurs, as shown in fig. 8-9, the active hinge will bounce and will drive the entire panel assembly to move toward the cab after bouncing, and since the latch 3 is disposed on the panel assembly, the latch 3 will also move toward the cab under the driving of the panel assembly, and enter a buffering sinking state. Before the movement, the lock catch 3 is erected on the first limit main board 10 and the second limit main board 11, after the movement, the lock catch 3 is separated from the second limit main board 11, only an overlapping area exists with the projection of the first limit main board 10 on the horizontal plane, correspondingly, due to the arrangement of the first limit groove 12, a buffer space which continues to move downwards can be just provided for the lock catch 3, meanwhile, the buffer component 4 provides controllable supporting force for the lock catch 3 so as to buffer and release the lock catch 3 which continues to move along the first limit groove 12, and after the head type is separated, the lock catch 3 and the plate assembly return to a secondary locking state under the acting force of the buffer component 4. This aircraft bonnet lock is through first spacing groove 12 and the ingenious setting of buffer unit 4, the realization turns into the DMU space and bursts the space, thereby increase the purpose in the space that bursts, pedestrian's protection head score of bumping has been improved, be different from among the correlation technique when needing to utilize the DMU space in addition, owing to there is a process that subsides, consequently, there are very big requirement and restriction to the structure of aircraft bonnet lock itself, this aircraft bonnet lock utilizes the unfavorable condition of original to turn into the advantage condition with it and utilizes, in the space that bursts effectively to promote, the structure of aircraft bonnet lock itself has still been simplified, and realize the purpose of repetitious usage.

Further, the buffering assembly 4 includes a buffering main spring 40, one end of the buffering main spring 40 extends to form a fixing section 400, the fixing section 400 is used for fixing the buffering main spring 40 and the second locking unit 21, the other end of the buffering main spring extends to form a buffering section 401, at least a part of the buffering section 401 is overlapped with the projection of the first limiting groove 12 along the vertical surface, so as to ensure that at least a part of the buffering section 401 can provide supporting force for the latch 3 after the latch 3 is driven to be separated from the second limiting main board 11. In addition, the height difference between the horizontal plane where the lowest point of the buffering section 401 is located and the horizontal plane where the bottom surface of the first limiting groove 12 is located is not smaller than a preset height value, which is mainly to ensure a sinking space with a sufficient distance to realize buffering and energy releasing.

Further, referring to fig. 7, a second limiting groove 13 is disposed on the second limiting main board 11, a horizontal plane at the bottom of the second limiting groove 13 is higher than a horizontal plane at the bottom of the first limiting groove 12, and the second limiting groove 13 is used to assist 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. Specifically, the first limiting groove 12 and the second limiting groove 13 are respectively located on the first limiting main board 10 and the second limiting main board 11, the positions of the first limiting main board and the second limiting main board correspond to each other, the second limiting groove 13 mainly achieves positioning of secondary locking, the bottom of the first limiting groove 12 is lower than the bottom of the second limiting groove 13, effective sinking amount can be achieved through the difference between the first limiting groove 12 and the second limiting groove 13, a space for the lock catch 3 to continue moving downwards is provided, and as shown in fig. 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 avoid the influence of the arrangement of the buffering main spring 40 on the first-stage locking and the second-stage locking, the buffering assembly 4 further includes a limiting member 41, the limiting member 41 is disposed on the second locking unit 21 and abuts against the buffering section 401, and the limiting member 41 is configured to limit the position of the buffering section 401, so that the highest point of a partial section where the projection of the buffering section 401 and the projection of the first limiting groove 12 along the vertical plane are overlapped is not higher than the bottom of the second limiting groove 13. Specifically, the limiting member 41 is a rod-shaped structure, and since the buffering section 401 has a certain deformation capability, the limiting member 41 is vertically fixed on the second locking unit 21, and the rod body thereof abuts against the buffering section 401 to perform the function of pressing down and limiting.

Further, referring to fig. 3-5, the first locking unit 20 mainly includes a main catch 200 and a fixed main spring 201, wherein the main catch 200 includes a locking groove 202 and a limiting portion, the lock catch 3 is U-shaped, and the closed end thereof is used for locking with the hood lock, so that the locking groove 202 is hooked on the closed end of the lock catch 3; the limiting part comprises a first limiting bump 203 and a second limiting bump 204 from bottom to top, the first limiting bump 203 is used for being mutually clamped and fixed with the second locking unit 21 to carry out primary locking and fixing on the locking buckle 3, the second limiting bump 204 is used for being mutually clamped and fixed with the second locking unit 21 to carry out secondary locking and fixing on the locking buckle 3, the fixed main spring 201 is used for providing restoring force for the main clamping plate 200, namely, along with the rotation of the main clamping plate 200, the fixed main spring 201 can be correspondingly deformed and is applied with the restoring force, and the restoring force is used for resetting the main clamping plate 200.

Further, the second locking unit 21 mainly includes a limiting pulling plate 210 and a main restoring spring 215, the limiting pulling plate 210 includes a third limiting protrusion 211, and the third limiting protrusion 211 is used to be mutually clamped and fixed with the first limiting protrusion 203 and the second limiting protrusion 204, so as to assist the locking groove 202 to respectively perform the first-stage locking and the second-stage locking on the latch 3. Here, the third limit projection 211 is similar to a vertex angle structure, the included angle of the third limit projection 211 tends to 90 °, the first limit projection 203 is elongated, when the lock catch 3 is driven to move downwards, the main clamping plate 200 rotates around the fixed main spring 201, and when the first limit projection 203 moves to below the third limit projection 211, the first limit projection 203 and the third limit projection 211 can be mutually clamped, so as to realize one-stage locking of the hood lock and the lock catch 3. The shape of the second limiting protrusion 204 is similar to that of the third limiting protrusion 211, but the angle of the vertex angle is smaller than that of the third limiting protrusion 211, after the primary locking is realized, the main clamping plate 200 synchronously rotates continuously around the fixed main spring 201 under the driving of the lock catch 3 moving downwards, and when the second limiting protrusion 204 moves to the lower side of the third limiting protrusion 211, the second limiting protrusion and the third limiting protrusion 211 can be clamped with each other, so that the secondary locking of the hood lock and the lock catch 3 is realized.

Further, one end of the main reset spring 215 is connected to the first limiting main plate 10, the other end is connected to the limiting pulling plate 210, and the main reset spring 215 is used to assist the third limiting protrusion 211 to be respectively engaged and positioned with the first limiting protrusion 203 and the second limiting protrusion 204. Specifically, the main reset spring 215 is disposed below the first and second limiting

main boards

10 and 11, and acts similar to the main fixed spring 201 to a certain extent, so that the limiting pull plate 210 can flexibly rotate and help the limiting pull plate 210 reset, and since the limiting pull plate 210 is always pulled by the main reset spring 215 in the rotating process, the main reset spring can be matched with the main card 200.

Furthermore, as the hood lock is conveniently unlocked by remote secondary locking, the bottom of the limiting pull plate 210 is provided with the first connecting portion 212 and the second connecting portion 213 from bottom to top, the first connecting portion 212 is arranged on one side of the limiting pull plate 210 away from the main return spring 215 and is used for connecting an unlocking rope, the unlocking rope is a thin steel wire rope, the thin steel wire rope extends into the cab directly and is convenient for a driver to pull directly so as to release the clamping between the third limiting bump 211 and the first limiting bump 203 and the second limiting bump 204, generally, the secondary locking is unlocked only through the thin steel wire rope, and the primary locking can be unlocked when the hood is directly lifted by hands outside the vehicle. The purpose of the second connecting portion 213 is primarily 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 a structure that they are fastened to each other, and therefore, the peripheries of the first limiting main board 10 and the second limiting main board 11 are extended along the direction close to the object and are provided with convex edges. Wherein, the side of the limiting pulling plate 210 far from the third limiting bump 211 is provided with a fourth limiting bump 214, the fourth limiting bump 214 is used for coacting with the side wall of the first limiting main plate 10, i.e. abutting against the convex edge, so as to limit the rotation angle of the limiting pulling plate 210 during unlocking, and similarly, the upper half structure of the limiting pulling plate 210 also abuts against the convex edge in the unlocking state.

Furthermore, the value range of the preset height value is 8-12 mm. In addition, because hasp 3 can impact first spacing groove 12 and second spacing groove 13 to a certain extent when lasting downstream, for protective structure is not damaged, first spacing groove 12 and second spacing groove 13 all are equipped with flange structure to the outside, can effectively increase structural strength.

Further, a left bushing 50 is further arranged between the main clamping plate 200 and the fixed main spring 201, a right bushing 51 is arranged between the limiting pulling plate 210 and the buffering main spring 40, the main clamping plate 200, the fixed main spring 201 and the left bushing 50 are fixed on the first limiting main plate 10 and the second limiting main plate 11 through a left riveting shaft 60, and the limiting pulling plate 210, the buffering main spring 40 and the right bushing 51 are fixed on the first limiting main plate 10 and the second limiting main plate 11 through a right riveting shaft 61.

This aircraft bonnet lock is through setting up the first spacing groove 12 and the second spacing groove 13 that high length is different, utilize the difference in height between the two to realize effectual space of sinking, bounce at the initiative hinge and drive the plate assembly and remove towards the direction of driver's cabin, when synchronous drive hasp 3 removes and breaks away from the spacing mainboard 11 of second towards the direction of driver's cabin, buffering main spring 40 provides controllable holding power for hasp 3 that has broken away from the spacing mainboard 11 of second, and cushion the ability of releasing to hasp 3 that continues to remove along first spacing groove 12, realize with the initiative hinge synchronous and make full use of plate assembly DMU safety gap between aircraft bonnet lock department and cabin hard spot and come the energy-absorbing buffering to reduce the injury value. In addition, the hood lock is different from the prior art that when the DMU space needs to be utilized, due to the fact that a sedimentation process exists, the structure of the hood lock is greatly required and limited, the manufacturing difficulty and the cost are high, the original adverse conditions are utilized by the hood lock, the adverse conditions are converted into the advantageous conditions to be utilized, the collapse space is effectively improved, the structure of the hood lock is simplified, and the purpose of repeated use is achieved.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice 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 applied to other embodiments without departing from the spirit or scope of the application. Thus, the present 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 disclosed herein.

Claims

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 content of the first and second substances,

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.