CN115214528A

CN115214528A - Force limiting buffer mechanism and safety belt lock catch pair assembly

Info

Publication number: CN115214528A
Application number: CN202210827311.XA
Authority: CN
Inventors: 张庭宇; 倪健; 谢勒尔·彼得
Original assignee: Ningbo Junsheng Automobile Safety System Co ltd
Current assignee: Ningbo Junsheng Automobile Safety System Co ltd
Priority date: 2022-07-13
Filing date: 2022-07-13
Publication date: 2022-10-21

Abstract

The application provides a vice assembly of limit force buffer gear and safety belt hasp is applied to vehicle safety technical field, and wherein limit force buffer gear includes: column cap, energy-absorbing component, plate spring, support, base, steel cable; the energy absorption part is arranged between the plate spring and the column head; the plate spring is arranged on the bracket, two ends of the plate spring are abutted against the surface of the bracket, and the middle part of the plate spring is raised towards the direction of the energy-absorbing component; the bracket is arranged at a preset position on the vehicle body through the base; the first end of the steel cable is connected to the safety belt lock catch, and the second end of the steel cable penetrates through the support, the plate spring and the energy absorption component in sequence and then is in hard connection with one end of the column head. The force limiting buffer mechanism achieves buffer type energy absorption through the non-rigid energy absorption part, energy is absorbed in advance at the initial stage of impact, the energy is continuously absorbed at the middle stage, reverse acting force is provided at the later stage after the energy absorption is completed, and the energy absorption effect in the whole impact process is effectively improved.

Description

Force limiting buffer mechanism and safety belt lock catch pair assembly

Technical Field

The application relates to the technical field of vehicle safety, in particular to a force limiting buffer mechanism and a safety belt lock catch pair assembly.

Background

Passenger car seat belts are generally provided with a pretensioner mechanism, a force limiter mechanism, and other devices at the side of the shoulder belt, so that when a passenger wears the belt and an impact such as an emergency brake or a collision accident occurs, the pretensioner mechanism, the force limiter mechanism, and other devices absorb the force applied to the shoulder belt to some extent in advance, so that the belt forms a certain sliding space at the chest, waist, and other portions of the passenger, thereby partially improving the force applied to the passenger by the shoulder belt when the passenger moves forward.

However, when the impact is large, the occupant continues to move in the vehicle front direction by inertia, the amount of slack of the webbing of the chest and waist of the occupant is eliminated, the occupant is tightened by the seat belt and receives the impact energy, and the occupant is easily injured by receiving an excessive load as the amount of movement of the occupant increases.

Therefore, a new energy absorbing seatbelt apparatus solution is needed

Disclosure of Invention

In view of this, embodiments of the present disclosure provide a force-limiting buffer mechanism and a seat belt latch assembly, which are installed between a seat belt latch and a seat, and can transfer an impact load to the force-limiting buffer mechanism through a webbing, a mortise lock, and a latch to be absorbed in advance, so that only a small amount of residual energy is received by a seat belt component such as the webbing again, thereby changing a form of a force applied to a passenger by a seat belt during an impact, so as to reduce a waist injury value and ensure safety of the passenger.

The embodiment of the specification provides the following technical scheme:

an embodiment of the present specification provides a force limiting buffer mechanism, including: column cap, energy-absorbing component, plate spring, support, base, steel cable;

the energy absorption part is arranged between the plate spring and the column head;

the plate spring is arranged on the bracket, two ends of the plate spring are abutted against the surface of the bracket, and the middle part of the plate spring is raised towards the direction of the energy-absorbing component;

the bracket is arranged at a preset position on the vehicle body through the base;

the first end of the steel cable is connected to the safety belt lock catch, and the second end of the steel cable penetrates through the bracket, the plate spring and the energy absorption component in sequence and then is in hard connection with one end of the column head;

when the safety belt lock catch is under tension, the steel cable is drawn by the safety belt lock catch to drive the column cap to impact the energy-absorbing component and press the plate spring, the plate spring is pressed to establish a reverse buffering force to counteract a first peak force, then the energy-absorbing component is deformed under stress to absorb the impact energy, and the plate spring provides the reaction force of the final section.

The embodiment of the present specification further provides a seat belt buckle sub-assembly, which includes a seat belt buckle and the force limiting buffer mechanism according to any one of the embodiments of the present specification, wherein the seat belt buckle is mounted on a vehicle through the force limiting buffer mechanism.

Compared with the prior art, the beneficial effects that can be achieved by the at least one technical scheme adopted by the embodiment of the specification at least comprise:

the buckle and the seat are connected by utilizing a non-rigid connecting mechanism, wherein the non-rigid connecting mechanism comprises a component (such as a plate spring) with elastic property and an energy absorbing component, the plate spring can absorb the tensile force of a safety belt acting on the buckle in advance in the initial stage of collision, the energy absorbing component absorbs the overload energy in the impact through deformation in the middle stage, and the plate spring provides the final reverse acting force in the later stage, so that the energy absorbing effect is effectively improved, the axial and radial positioning after the energy absorption is completed is provided through a steel cable when the energy absorbing component is deformed and recovered, so that the buffer space of the waist of a passenger in the back row can be increased according to the designed angle by the buckle using the force limiting buffer mechanism, when the vehicle has the impact of frontal collision, although the passenger can continuously move towards the direction of the vehicle head by the inertia generated by the collision, the residual small amount of energy is born by the safety belt component such as a mesh belt, a latch and the buckle are transferred to the force limiting buffer mechanism, the residual energy is absorbed by the force limiting plate spring and the buffer mechanism, so that the residual small amount of energy is born by the safety belt component such as the mesh belt, the mesh belt system can generate a slow release force acting on the mesh belt, and the peak load of the safety belt is effectively set at a lower level, for example, the peak load reaches the upper limit of the safety belt Kn to be obviously reduced, and the safety belt is no longer reduced, and the safety belt is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described 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 a schematic structural view of a force limiting buffer mechanism provided by the present invention;

FIG. 2 is an assembled schematic view of a force limiting damping mechanism provided by the present invention;

FIG. 3 is a schematic structural view of the assembly details of the leaf spring in the force limiting buffer mechanism provided by the present invention;

FIG. 4 is a structural diagram of a detail of a plate spring in a force limiting buffer mechanism provided by the invention;

FIG. 5 is a schematic top view of a force limiting buffer mechanism according to the present invention when it is not absorbing energy;

FIG. 6 is a schematic top view of a force limiting buffer mechanism for absorbing energy according to the present invention;

FIG. 7 is a schematic side view of an unbuffered energy absorbing shaft of a force limiting buffer mechanism provided by the present invention;

FIG. 8 is a schematic axial view of a force-limiting buffer mechanism according to the present invention during energy absorption;

FIG. 9 is a schematic bottom view of a force limiting buffer mechanism according to the present invention when it is not absorbing energy;

FIG. 10 is a schematic bottom view of a force limiting buffer mechanism according to the present invention for absorbing energy;

FIG. 11 is a schematic view of a response curve between displacement and load bearing of a force limiting buffer mechanism provided by the present invention with respect to an occupant;

fig. 12 is a schematic view of a seat belt latch assembly provided in a rear seat and not under tension according to the present invention;

fig. 13 is a schematic view of a seatbelt buckle subassembly of the present invention under tension.

Detailed Description

The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. The present application is capable of other and different embodiments and its several details are capable of modifications and/or changes in various respects, all without departing from the spirit of the present application. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. 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.

It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present application, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number and aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present application, and the drawings only show the components related to the present application rather than the number, shape and size of the components in actual implementation, and the type, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.

In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the present invention may be practiced without these specific details.

In a three-point seat belt, devices such as a retractor, a pretensioner mechanism, and a force limiter mechanism are generally provided, and although these devices can reduce the magnitude of the force applied to the occupant by the belt to some extent in the event of an impact such as a collision or a sudden brake of the vehicle, when the impact is large, the occupant needs to move forward continuously due to inertia, and at this time, the occupant is tightened too tightly by the belt to receive the impact energy, and the occupant is still easily injured.

For example, in the conventional patent document (publication No. CN109421656 a), a buckle side force limiter mechanism is provided on one side of a buckle, and a deformation piece (such as a deformation tube or a deformation hole) in the buckle side force limiter mechanism is deformed to absorb part of the impact energy.

For example, in the conventional patent document (publication number: GB 2349615B), a force limiter is provided on one side of a tongue piece, and a deformation piece in the force limiter is deformed to absorb a part of the impact energy.

The force limiter absorbs energy directly through deformation when being activated, and can absorb part of impact energy when the impact energy is smaller, so that the acting force finally exerted on the passenger by the safety belt is limited to a certain degree (such as 5 kN), but when the impact energy is larger, the larger impact energy is still transferred to the safety belt and then borne by the passenger, and the energy absorption process of the force limiter is longer, the duration of the impact borne by the passenger is long, and the passenger is easy to be injured.

In view of the above, after a safety device and a force limiter mechanism for a vehicle are explored and improved, a force limiting buffer mechanism capable of adapting to various impact conditions and rapidly absorbing impact energy is provided: as shown in fig. 1, the force-limiting buffer mechanism comprises a column cap 9, an energy-absorbing component 10, a leaf spring 1, a bracket 3, a base 5 and a steel cable 7, wherein a first end of the steel cable 7 is connected to a safety belt buckle 6, and a second end of the steel cable 7 is in hard connection with one end of the column cap 9 after sequentially penetrating through the bracket 3, the leaf spring 1 and the energy-absorbing component 10, so that a non-rigid pre-energy-absorbing structure is formed, the mode and the size of force acting on passengers can be changed after pre-absorption is carried out on different impact energy, axial and radial positioning is provided after energy absorption is completed, and the buffer space of the waist of the passengers in the back row can be increased according to the designed angle.

After the force-limiting buffer mechanism is applied between the buckle 6 and a seat (not shown in the figure), when impact (such as braking, collision and the like) occurs, inertia generated by the impact causes a passenger on the seat to move towards the vehicle head direction, at the moment, the loose amount of the woven belts at the chest and waist of the passenger is eliminated by the safety belt with a pre-tightening function, the load borne by the passenger is gradually increased along with the increase of the movement amount of the passenger, at the moment, the load is transferred onto the force-limiting buffer mechanism through the woven belts, the mortise locks and the buckles, namely, after the buckles are subjected to tension towards the vehicle head direction, the steel cable (such as a steel wire rope) is pulled, the steel wire rope drives the column head to impact the energy-absorbing part and extrude the plate spring, a reverse buffer force is established by the plate spring at the initial stage to offset a first peak value force, the instant G force borne by the passenger is reduced, then the energy-absorbing part is subjected to deform and absorb all impact energy, and finally the plate spring provides a final stage reaction force. Therefore, the force limiting buffer mechanism starts to buffer and absorb energy by the plate spring and the energy absorption part, and after the effect of reducing the load peak force is achieved, the residual energy is born by the safety belt parts such as the woven belt and the like again.

The buffering type energy absorption and acting force change of the force limiting buffering mechanism under various working conditions are shown as follows:

general braking (e.g., emergency braking) situations. At the moment, the plate spring provides elastic force with slight damping, certain buffer is provided for the waist and the chest of the back row passenger, and the tension force of the shoulder belt and the waist belt is used for the flexible braking action;

the collision occurs at a vehicle speed of 30 to 60 km/h. At the moment, the plate spring is at T ₀ Within +50ms, a cushioning force is established that is intended to reduce the first peak, relieving the rear passenger's lap and chest from the shoulder and lap belts. Then, as the trunk of the passenger is continuously pressed, the energy absorption part starts to play a role, for example, the impact energy is continuously absorbed in the stroke of displacement of 90mm until the passenger is static;

the vehicle speed is 60 km/h or more. At the moment, the working principles of the plate spring and the energy absorption part are the same, all response time and total working time are greatly shortened, and the buffering type energy absorption effect can be realized through the plate spring and the energy absorption part. The energy absorption device has the advantages that after energy absorption is completed, energy overload caused by overlarge vehicle speed is activated according to designed working conditions, and a column head at the tail end of a steel wire rope is clamped, so that the lock catch assembly cannot be separated from a vehicle metal plate, extra displacement is not generated, and passengers are prevented from being thrown to cause secondary damage.

The technical solutions provided by the embodiments of the present application are described below with reference to the accompanying drawings.

As shown in fig. 1 and 2, a force limiting buffer mechanism includes: column cap 9, energy absorbing component 10, leaf spring 1, support 3, base 5 and steel cable 7. Wherein, the energy-absorbing component 10 is arranged between the plate spring 1 and the column head 9; the plate spring 1 is arranged on the bracket 3, two ends of the plate spring are abutted against the surface of the bracket 3, and the middle part of the plate spring is protruded towards the direction of the energy-absorbing component 10; the bracket 3 is arranged at a preset position on the vehicle body through a base 5; the first end of the steel cable 7 is connected with the safety belt buckle 6, and the second end of the steel cable 7 is connected with one end of the column cap 9 in a hard way after sequentially passing through the bracket 3, the plate spring 1 and the energy absorption part 10.

In practice, the wire rope 7 may be in the form of a non-rigid cable, such as a steel wire cable made up of a plurality of steel wires; the installation of the base 5 at a predetermined position on the vehicle body may depend on the actual application, such as the installation at the side of a seat, for example, the installation at the vehicle body near the seat, etc.; the shapes, sizes and the like of the components such as the bracket 3, the base 5, the column head 9 and the like can be determined according to the installation and use requirements.

As shown in fig. 3 to 10, when the seatbelt buckle is attached to the seat (or the sheet metal of the vehicle body) through the force limiting and buffering mechanism, the column head 9, the energy absorbing member 10, and the plate spring 1 are limited to one side of the bracket 3 by the wire rope 7 in a state before activation when the seatbelt buckle 6 is not subjected to a tensile force. When the safety belt buckle 6 is under tension, the steel cable 7 is drawn by the safety belt buckle 6 to drive the column cap 9 to impact the energy-absorbing component 10 and squeeze the plate spring 1, at this time, the plate spring 1 is squeezed to establish a reverse buffering force to counteract a first peak force (for example, about 5 kN), then the energy-absorbing component 10 is stressed and deformed to absorb the impact energy, after the energy absorption is finished, the plate spring 1 provides a reaction force at the final section, and the energy-absorbing component 10 further counteracts the impact energy when recovering the original shape.

As shown in fig. 11, when the occupant wears the safety belt and an emergency braking or collision accident occurs, the chest and waist sliding spaces are formed to a certain extent based on the force limiting buffer mechanism, and during the displacement of the occupant continues to increase, a buffer force can be quickly established based on the pre-absorption buffer manner to counteract the first peak force (for example, about 5 kN), then the load slightly falls under the reaction of the buffer force, and during the displacement of the occupant continues to increase, the load acting on the occupant is quickly enabled to reach the upper limit (for example, 5-7 kN) and is not increased any more, at the moment, the load is transferred to the force limiting buffer mechanism and is absorbed by the force limiting plate spring and the energy absorbing component, so that the peak force of the load can be reduced, the impact energy can be absorbed, and the form of the force acting on the occupant can be improved, and the injury of the occupant can be avoided.

In some embodiments, the bracket 3 may be fixed to the base 5 by means of a clevis, so that the bracket 3 and the leaf spring 1 are non-rigidly fixed and the movement of the bracket 3 and the leaf spring 1 can be limited to some extent by the clevis.

In implementation, the base 5 is provided with a mounting part fixedly connected with a vehicle body and two vertical arms vertically and upwardly extending from the mounting part, and the vertical arms are provided with two mounting holes vertically extending; at this moment, limit for force buffer gear still includes two U type and presss from both sides 2, the U type presss from both sides including two free end portions and intermediate junction portion, two the free end portion passes respectively the mounting hole on the arm is found and is fixed, intermediate junction portion with found to form accommodation space between the arm, support 3 and leaf spring 1 both ends inlay respectively in the accommodation space on the arm is found to both sides to through U type press from both sides restriction support 3 and leaf spring 1 to keeping away from the direction of standing the arm and removing, realize the not rigid movement restriction of certain degree in the equidirectional orientation about from top to bottom.

In some embodiments, a stop member may be added to the bracket, by which non-rigid movement of the leaf spring is further limited.

In implementation, the bracket 3 is further provided with two limiting bolts 4, wherein the two limiting bolts 4 are respectively installed at the outer sides of the two ends of the plate spring 1 to prevent the plate spring 1 from separating from the accommodating space of the U-shaped clamp. Through restricting leaf spring 1 in the accommodation space of U type clamp, not only be favorable to leaf spring 1 to carry out non-rigid movement, can avoid the limit for force buffer gear to break away from support 3 and lead to the buffering effect of energy absorption and providing reaction force to descend because of leaf spring 1.

In some embodiments, a limit bolt may be provided at a specific position to limit the movement of the plate spring.

In implementation, two limit bolts 4 are respectively installed outside two intermediate junction portion, and specifically limit bolt 4 is close to one side of U type clamp 2 and is set up, not only can restrict the removal of leaf spring 1 in the left and right sides direction, when U type clamp 2 probably receives the deformation of leaf spring 1 and/or support 3 and is extrudeed the atress and warp moreover, can provide the support to U type clamp 2 one side through limit bolt 4, keeps the U type clamp shape better. In addition, the limiting bolt 4 is convenient for assembling and using parts.

In an example, the height of the limiting bolt 4 on the bracket 3 is not lower than that of the accommodating space on the bracket 3, so that the bracket 3 can be prevented from being separated from the U-shaped clamp 2 after being deformed by force.

In an example, the height of the limit bolt 4 on the bracket 3 is not lower than that of the intermediate connecting part on the bracket 3, and the limit bolt 4 is higher than the U-shaped clamp, so that the movement of the bracket 3 in the left-right direction is more effectively limited, and the bracket 3 is effectively prevented from being separated from the accommodating space due to the deformation caused by stress.

In some embodiments, a stop mechanism (e.g., a raised bracket on the base 5 near the buckle 6 in fig. 1) may be provided on the base 5, and the second end of the cable 7 is then passed through the stop mechanism, the bracket 3, the leaf spring 1 and the energy absorbing member 10 in sequence and then is rigidly connected to an end of the column head 9, and the stop mechanism limits the upward movement of the cable 7 near the bracket 3 when the cable is forced.

Through stop gear, not only can provide better axial and radial location at the energy-absorbing in-process, provide good axial and radial location moreover after the energy-absorbing equally to provide good cushioning effect for the safety belt on the passenger's body.

Further, by setting the height of the position where the steel cable 7 passes through the limiting mechanism, the limiting mechanism can better keep the steel cable 7 close to one side of the bracket 3 horizontal, and better perform axial and radial positioning.

In some embodiments, the energy absorbing component 10 is provided with a limiting region at an end portion of one side close to the plate spring 1, wherein the limiting region is matched with a convex profile of the middle of the plate spring 1, and further, the plate spring 1 and the energy absorbing component 10 are mutually limited before and after energy absorption, which is beneficial to ensuring the energy absorbing effect.

In some embodiments, energy absorbing member 10 is a crash tube having a plurality of energy absorbing holes extending perpendicular to the direction of extension of steel cables 7. The type of the crush tube may be selected according to application requirements, and is not limited herein.

In some embodiments, corresponding stop means can be provided on the cable, by means of which the cable 7, the bracket 3, the leaf spring 1, the energy absorption element 10 and the column cap 9 form a structurally stable element.

Specifically, the limiting device provided on the steel cable 7 may be provided near one side of the bracket 3 or the plate spring 1, and when the limiting device is fixed on the steel cable 7, the limiting device may be abutted against one side of the bracket 3 or the plate spring 1 to limit the plate spring 1 and the energy absorbing component 10 after the second end of the steel cable 7 is hard-connected with one end of the column cap 9, so that the plate spring 1 and/or the energy absorbing component 10 are in a preset compression state, and the compression state may be a state that the energy absorbing is activated in an impact, which is not limited herein.

Based on the same inventive concept, the force limiting buffer mechanism described in any of the foregoing embodiments can be used in a vehicle seat belt apparatus.

As shown in fig. 12 to 13, a seatbelt buckle sub-assembly includes a seatbelt buckle 100 and a force limiting buffer mechanism 200 as described in any one of the above embodiments, wherein the seatbelt buckle 100 is mounted on a vehicle through the force limiting buffer mechanism 200.

In practice, the force limiting buffer mechanism 200 can be mounted at a predetermined position according to application requirements, such as on a sheet metal of a vehicle body between seats.

After the seatbelt buckle 100 is fixed to the vehicle body by the force limiting and buffering mechanism 200, when the seatbelt buckle 100 (shown as the right buckle in fig. 13) receives a pulling force F, the force limiting and buffering mechanism 200 (shown as the right force limiting and buffering mechanism in fig. 13) performs a buffering type energy absorption process, and the deformation of the energy absorption component during energy absorption can enable the seatbelt to form a chest and waist sliding space to a certain extent, and the force can be changed by energy absorption, so that the force form acting on the occupant can be improved, and the possibility that the occupant is easily injured during forward movement is reduced.

In some embodiments, as shown in fig. 1, in the force limiting buffer mechanism, the first end of the steel cable is connected with the belt buckle by a rivet and then is fixed by the welding of the chuck 8, which is beneficial to improving the reliability of the assembly and preventing the possibility that the buckle is separated from the steel cable to cause the passenger to be thrown away.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A force limiting and cushioning mechanism, comprising: column cap, energy-absorbing component, plate spring, support, base, steel cable;

the first end of the steel cable is connected with the safety belt lock catch, and the second end of the steel cable penetrates through the bracket, the plate spring and the energy absorption component in sequence and then is in hard connection with one end of the column head;

2. The force limiting and cushioning mechanism of claim 1, wherein the base has a mounting portion fixedly attached to the vehicle body and two upstanding arms extending vertically upwardly from the mounting portion;

the force limiting buffer mechanism also comprises two U-shaped clamps which are respectively fixed on the two vertical arms;

the vertical arm is provided with two mounting holes extending in the vertical direction, the U-shaped clamp comprises two free end parts and a middle connecting part, the two free end parts respectively penetrate through the mounting holes in the vertical arm and are fixed, and an accommodating space is formed between the middle connecting part and the vertical arm;

the support with the both ends of leaf spring inlay respectively in the accommodation space on the both sides found the arm.

3. The force-limiting buffer mechanism of claim 2, wherein two limiting bolts are further disposed on the bracket, and the two limiting bolts are respectively mounted at the outer sides of the two ends of the plate spring to prevent the plate spring from being separated from the accommodating space.

4. The force-limiting buffer mechanism of claim 3, wherein two of the limiting bolts are respectively installed at the outer sides of the two intermediate connecting portions, and the height of the limiting bolt on the bracket is not lower than the height of the intermediate connecting portion on the bracket, so as to prevent the bracket from being separated from the accommodating space.

5. The force-limiting buffer mechanism of any one of claims 1 to 4, wherein a limiting mechanism is disposed on the base, a second end of the steel cable passes through the limiting structure, the bracket, the leaf spring and the energy-absorbing component in sequence and then is connected with an end of the column head in a rigid manner, and the limiting mechanism limits the upward movement of the steel cable close to one side of the bracket when being stressed.

6. The force limiting and cushioning mechanism of claim 5, wherein the limiting mechanism keeps the wire rope level near one side of the bracket.

7. The force-limiting buffer mechanism of claim 1, wherein a limiting region is disposed at an end of the energy-absorbing component near one side of the plate spring, and the limiting region matches with a convex profile of the middle portion of the plate spring.

8. The force limiting and cushioning mechanism of claim 1, wherein the energy absorbing member is a crash tube having energy absorbing holes extending perpendicular to the direction of elongation of the steel cable.

9. A seatbelt buckle sub-assembly, comprising a seatbelt buckle and the force limiting buffer mechanism according to any one of claims 1 to 8, wherein the seatbelt buckle is mounted to a vehicle via the force limiting buffer mechanism.

10. The belt latch subassembly of claim 9, wherein the first end of the wire cable of the force limiting buffer is connected to the belt latch by a rivet and then welded to the clip.