CN113335225B - Safety belt force limiter - Google Patents
Safety belt force limiter Download PDFInfo
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- CN113335225B CN113335225B CN202110599648.5A CN202110599648A CN113335225B CN 113335225 B CN113335225 B CN 113335225B CN 202110599648 A CN202110599648 A CN 202110599648A CN 113335225 B CN113335225 B CN 113335225B
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- force limiting
- force
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- fixed shaft
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/34—Belt retractors, e.g. reels
- B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/34—Belt retractors, e.g. reels
- B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
- B60R2022/4685—Reels with means to tension the belt in an emergency by forced winding up with means to adjust or regulate the tensioning force in relation to external parameters
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automotive Seat Belt Assembly (AREA)
Abstract
The invention discloses a safety belt force limiter which comprises a movable shaft, a fixed shaft, a force limiting rod and a force limiting stopping assembly, wherein one end of the force limiting rod is fixedly connected with the movable shaft, the other end of the force limiting rod is fixedly connected with the fixed shaft, and the force limiting stopping assembly is arranged between the movable shaft and the fixed shaft; before collision, the movable shaft, the force limiting rod, the force limiting stopping assembly and the fixed shaft synchronously rotate; during collision, the fixed shaft is locked and fixed, the movable shaft and the force limiting rod rotate, the movable shaft drives the force limiting stopping assembly to move, and when the force limiting stopping assembly moves to the limit position, the movement is stopped, and the movable shaft is limited to rotate. In one embodiment of the invention, the force limiting stopping function is realized through the force limiting stopping component, and the limit position of the force limiting stopping is adjusted through the self-adaptive adjusting component according to different passenger body types. The function gives consideration to both the regulation requirement and the performance requirement, is favorable for reducing the experiment times, improves the restraint effect of passengers, and saves the development cost.
Description
Technical Field
The invention relates to the technical field of safety belts, in particular to a safety belt force limiter.
Background
At the time of collision, the seatbelt restraint device is actuated and cannot be pulled out, so that the occupant can be restrained on the seat. Along with the collision, the dummy moves forwards, the pulling force of the safety belt on the dummy rises along with the collision, and the chest of the dummy rises synchronously under the load. In order to prevent the secondary injury caused by the overlarge pulling force of the safety belt, when the pulling force reaches a preset load (a force limiting value), the force limiting rod inside the safety belt retractor is twisted and deformed, the mesh belt can be continuously pulled out, the dummy continuously moves forwards, and the chest load is stabilized within the range of the force limiting value at the moment.
CNCAP rule version 21 tightened: the MPDB working condition introduces the THOR dummy, which is more sensitive to the chest load; meanwhile, the rule of the edition is more strict to the scoring rule of the chest compression amount. Therefore, in order to further reduce the load of the safety belt on the chest of the dummy, the force limiting rod with smaller specification is selected, and better performance protection effect is achieved.
Aiming at the movement amount of the dummy, the chest movement amount of the dummy is required to be between 100mm and 300mm according to the regulation GB 16166-2013. In order to meet the requirements of the regulations, the moving amount of the dummy needs to be reduced, and the larger the specification of the force limiting rod is, the easier the requirements of the regulations are met.
The problem that current safety belt limit device exists is:
(1) When the force limiting rod is selected, the balance point of the regulation requirement (chest movement amount) and the performance requirement (chest injury value) is difficult to find, multiple rounds of experiments are needed, the cost is high, and the experiment period is long.
(2) After a single force limiting rod is selected, a force limiting value is determined, the force limiting value has a better protection effect on a passenger matched with the body type of the experimental dummy, but the same protection effect on passengers with other body types cannot be guaranteed, and certain limitation exists in practical use.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a safety belt force limiter capable of adaptively adjusting the actuating time of a safety belt force limiting and stopping function according to passengers of different body types.
The technical scheme of the invention provides a safety belt force limiter which comprises a movable shaft, a fixed shaft, a force limiting rod and a force limiting stopping assembly, wherein one end of the force limiting rod is fixedly connected with the movable shaft, the other end of the force limiting rod is fixedly connected with the fixed shaft, and the force limiting stopping assembly is arranged between the movable shaft and the fixed shaft;
before collision, the movable shaft, the force limiting rod, the force limiting stopping assembly and the fixed shaft synchronously rotate;
when the collision happens, the fixed shaft is locked and fixed, the movable shaft and the force limiting rod rotate, the movable shaft drives the force limiting stop assembly to move, and when the force limiting stop assembly moves to the limit position, the movement is stopped, and the movable shaft is limited to rotate.
Furthermore, the force-limiting stopping assembly comprises a rotating part and a fixed part, the rotating part is movably connected with the moving shaft along the axial direction, the fixed part is fixedly connected with the fixed shaft, and the rotating part is matched with the fixed part;
during the collision, the moving axis drives rotate the synchronous rotation of piece, the mounting is motionless, rotate the piece around the mounting rotates and along axial displacement, works as when rotating the piece along axial displacement to extreme position, moving axis stall.
Furthermore, the rotating part is a force limiting nut, the fixing part is a force limiting thread part, the force limiting nut is installed at the end part, facing the fixed shaft, of the moving shaft, the force limiting thread part is fixed at the end part, facing the moving shaft, of the fixed shaft, and the force limiting nut is in threaded connection with the force limiting thread part.
Further, the moving axis includes force limiting rod chamber and force limiting nut chamber, the moving axis is cylindrical, the force limiting rod chamber runs through the axial direction of moving axis, the one end of force limiting rod with the moving axis passes through first splined connection, and the other end passes behind the force limiting rod chamber with the dead axle passes through second splined connection, the force limiting rod with force limiting rod chamber clearance fit, the force limiting nut chamber is located the one end in force limiting rod chamber, the force limiting nut imbeds in the force limiting nut chamber.
Further, the self-adaptive adjusting component is connected with the dead axle, the limiting position is used for adjusting the limiting force stopping component;
when the safety belt is pulled out, the safety belt drives the movable shaft, the force limiting stopping component and the fixed shaft to synchronously rotate, the fixed shaft drives the self-adaptive adjusting component to move, the moving stroke of the self-adaptive adjusting component is related to the pulling-out stroke of the safety belt, and the moving stroke is also related to the force limiting stopping stroke of the force limiting stopping component.
Further, the moving stroke comprises a large stroke and a small stroke, when the pulling-out stroke of the safety belt is small, the moving stroke is the small stroke, and the force limiting stopping stroke is large; when the pulling-out stroke of the safety belt is large, the moving stroke is a large stroke, and the force limiting stopping stroke is small.
Further, the larger the large stroke is, the smaller the limit force stop stroke is.
Further, the adaptive adjustment assembly comprises a movable threaded part, a movable disc and a movable pin, the movable threaded part is fixedly connected with the fixed shaft, the movable disc is in threaded connection with the movable threaded part, one end of the movable pin is inserted into the fixed shaft and can move along the fixed shaft in the axial direction, the other end of the movable pin abuts against the movable disc, and the movable disc rotates relative to the movable pin;
when the safety belt is pulled out, the safety belt drives the fixed shaft to rotate, the movable thread part rotates relative to the movable disc, the movable disc gradually moves relative to the fixed shaft in the axial direction, and the movable disc pushes the movable pin to move relative to the fixed shaft in the axial direction.
Further, when the moving pin does not penetrate out of the fixed shaft, the limit position of the force limiting stop assembly is the end surface of the fixed shaft;
when the movable pin penetrates out of the fixed shaft, the limiting position of the force limiting stopping assembly is the end part of the movable pin.
The invention also provides an automobile comprising the safety belt force limiter.
After adopting above-mentioned technical scheme, have following beneficial effect:
in one embodiment of the invention, the force limiting stop function is realized by a force limiting stop component. The function gives consideration to both the regulation requirement and the performance requirement, is favorable for reducing the experiment times and saves the development cost.
In another embodiment of the invention, the limit position of force limit stop is adjusted by the self-adaptive adjusting component according to different passenger body types, so that the limitation that a single force limit value cannot give consideration to all passenger body types is solved. In practical use, matched occupant protection schemes can be better provided for occupants of different body types.
Drawings
The disclosure of the present invention will become more readily understood by reference to the drawings. It should be understood that: these drawings are for illustrative purposes only and are not intended to limit the scope of the present disclosure. In the figure:
FIG. 1 is an assembly view of a seatbelt force limiter in one embodiment of the present invention;
FIG. 2 is an exploded view of a seatbelt force limiter in one embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a movable shaft according to an embodiment of the present invention;
FIG. 4 is a schematic view of a force-limiting lever according to an embodiment of the present invention;
FIG. 5 is a schematic structural view of a force limiting nut in accordance with an embodiment of the invention;
FIG. 6 is a schematic side view of a fixed shaft according to an embodiment of the present invention;
FIG. 7 is a schematic view of another side of the fixed shaft according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a removable disk in accordance with one embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a tape reel according to an embodiment of the present invention;
fig. 10 is a sectional view of a seatbelt force limiter in an initial state according to an embodiment of the present invention;
fig. 11 is a sectional view showing a locked state of the webbing limiter when used by a small-sized passenger in accordance with an embodiment of the present invention;
fig. 12 is a sectional view showing a locked state of the webbing limiter in use by a large occupant in an embodiment of the present invention.
Reference symbol comparison table:
moving shaft 1: a force limiting rod cavity 11 and a force limiting nut cavity 12;
a fixed shaft 2: spline grooves 21, fixed plates 22, pin holes 23;
the force limiting rod 3: first splines 31, second splines 32;
force limiting stop assembly 4: a force-limiting nut 41, a force-limiting threaded portion 42;
the adaptive adjustment component 5: the movable screw part 51, the movable disk 52, the movable pin 53, the belt sensing disk 54, the guide groove 521, the insertion hole 522, the threaded hole 523, the convex tooth 541, the positioning pin 542 and the through hole 543;
a left decorative cover 6, a right decorative cover 7 and a frame 8;
a seat belt 10.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings.
It is easily understood that according to the technical solution of the present invention, those skilled in the art can substitute various structures and implementation manners without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as limiting or restricting the technical aspects of the present invention.
The terms of orientation of up, down, left, right, front, back, top, bottom, and the like referred to or may be referred to in this specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed correspondingly according to the position and the use state of the device. Therefore, these and other directional terms should not be construed as limiting terms.
In some embodiments of the present invention, as shown in fig. 1-2, the safety belt force limiter includes a movable shaft 1, a fixed shaft 2, a force limiting rod 3, a force limiting stop assembly 4, and a force limiting stop assembly 4, wherein one end of the force limiting rod 3 is fixedly connected to the movable shaft 1, and the other end of the force limiting rod 3 is fixedly connected to the fixed shaft 2;
before collision, the movable shaft 1, the force limiting rod 3, the force limiting stopping component 4 and the fixed shaft 2 synchronously rotate;
during collision, the fixed shaft 2 is locked and fixed, the movable shaft 1 and the force limiting rod 3 rotate, the movable shaft 1 drives the force limiting stop assembly 4 to move, and when the force limiting stop assembly 4 moves to a limit position, the movement is stopped, and the movable shaft 1 is limited to rotate.
Specifically, the safety belt 10 is wound on the outer surface of the movable shaft 1, two ends of the force limiting rod 3 are respectively and fixedly connected with the movable shaft 1 and the fixed shaft 2, and the force limiting stop assembly 4 is arranged between the movable shaft 1 and the fixed shaft 2.
Before collision, when the safety belt 10 is used normally, when the safety belt 10 is pulled, the safety belt 10 drives the movable shaft 1, the force limiting rod 3, the force limiting stopping component 4 and the fixed shaft 2 to rotate synchronously. At this time, the force limiting rod 3 and the force limiting stopping component 4 rotate together with the spool 1, the force limiting rod 3 does not play a role in limiting force, and the force limiting stopping component 4 does not play a role in stopping limiting force.
After the collision occurs, the fixed shaft 2 is locked by a locking mechanism, which is a conventional technique and will not be described in detail herein. The fixed shaft 2 is fixed after being locked, at the moment, when the safety belt 10 is pulled, a rotating force is applied to the moving shaft 1, when the pulling force is enough, the force limiting rod 3 is twisted and deformed, one end, connected with the moving shaft 1, of the force limiting rod 3 rotates, one end, connected with the fixed shaft 2, of the force limiting rod 3 is not moved, and after the moving shaft 1 rotates, the safety belt 10 is released, so that the safety belt 10 can be continuously pulled out for a section of stroke. At this time, the force limiting rod 3 plays a role of force limiting, and the chest load is stabilized within the range of force limiting values.
The movable shaft 1 simultaneously drives the force limiting stopping assembly 4 to move, when the force limiting stopping assembly 4 moves to the extreme position, the movement is stopped, the movable shaft 1 is limited to rotate, and at the moment, the safety belt 10 cannot be pulled out continuously. The force limiting stopping component realizes the force limiting stopping function, and the continuously rising tension of the safety belt can continuously restrain the dummy to move forwards in the force limiting stopping stage, so that the chest movement amount is controlled. The function gives consideration to both regulatory requirements and performance requirements, can use low specification limit value to correspond to 'sensitive' THOR dummy, and avoids the regulation NG caused by the over-standard chest movement amount. The method is favorable for reducing the experiment times and saving the development cost.
In some embodiments of the present invention, as shown in fig. 1-2, the safety belt force limiter further comprises a left trim cover 6, a right trim cover 7, and a frame 8, the left trim cover 6 is mounted at the left end of the frame 8, the right trim cover 7 is mounted at the right end of the frame 8, and the movable shaft 1, the force limiting rod 3, the force limiting stop assembly 4, and the fixed shaft 2 are mounted in the frame 8 and are rotatable with respect to the frame 8. The left end of the moving shaft 1 is rotatably connected with a left decorative cover 6, and the right end of the fixed shaft 2 is rotatably connected with a right decorative cover 7.
In some embodiments of the present invention, the force-limiting stop assembly 4 includes a rotating member and a fixed member, the rotating member is movably connected with the moving shaft 1 along the axial direction, the fixed member is fixedly connected with the fixed shaft 2, and the rotating member is matched with the fixed member;
during collision, the moving shaft 1 drives the rotating part to synchronously rotate, the fixing part is fixed, the rotating part rotates around the fixing part and moves along the axial direction, and when the rotating part moves to the limit position along the axial direction, the moving shaft 1 stops rotating.
Further, as shown in fig. 2, the rotating member is a force limiting nut 41, the fixed member is a force limiting threaded portion 42, the force limiting nut 41 is attached to an end portion of the moving shaft 1 facing the fixed shaft 2, the force limiting threaded portion 42 is fixed to an end portion of the fixed shaft 2 facing the moving shaft 1, and the force limiting nut 41 is screwed to the force limiting threaded portion 42.
Specifically, as shown in fig. 5, the force-limiting nut 41 has a hexagonal outer surface and an internal thread inner surface. As shown in fig. 6, the force limiting screw portion 42 is fixed to the left end of the fixed shaft 2, and the force limiting screw portion 42 is provided with an external thread.
The force-limiting nut 41 is mounted on the right end of the moving shaft 1, and is screw-engaged with the force-limiting threaded portion 42.
Before a collision occurs, when the safety belt 10 is normally used, the movable shaft 1 and the fixed shaft 2 rotate synchronously, so that the force limiting nut 41 and the force limiting thread part 42 do not rotate relatively.
After collision, the fixed shaft 2 is locked and fixed, the movable shaft 1 and the force limiting rod 3 rotate, the movable shaft 1 drives the force limiting nut 41 to rotate around the force limiting threaded part 42, so that the force limiting nut 41 moves axially towards the position close to the force limiting threaded part 42, when the force limiting nut 41 moves to the limit position and cannot move axially continuously, the movable shaft 1 cannot rotate continuously, and the safety belt 10 cannot be pulled out continuously.
As shown in fig. 6, the left end of the fixed shaft 2 is provided with a circular ring table, the outer surface of the circular ring table forms a force limiting thread portion 42, the inner surface of the circular ring table forms a spline groove 21, and the spline groove 21 is matched with the second spline 32 (see fig. 4) at the right end of the force limiting rod 3, so that the right end of the force limiting rod 3 cannot rotate during collision.
The second spline 31 at the left end of the force limiting rod 3 is fixedly connected with the left end of the movable shaft 1, and the movable shaft 1 rotates together.
In some embodiments of the present invention, as shown in fig. 3 to 4, the movable shaft 1 includes a force-limiting rod cavity 11 and a force-limiting nut cavity 12, the movable shaft 1 is cylindrical, the force-limiting rod cavity 11 penetrates through an axial direction of the movable shaft 1, one end of the force-limiting rod 3 is connected to the movable shaft 1 through a first spline 31, the other end of the force-limiting rod 3 penetrates through the force-limiting rod cavity 11 and then is connected to the fixed shaft 2 through a second spline 32, the force-limiting rod 3 is in clearance fit with the force-limiting rod cavity 11, the force-limiting nut cavity 12 is located at one end of the force-limiting rod cavity 11, and the force-limiting nut 41 is embedded into the force-limiting nut cavity 12.
The left end of the movable shaft 1 is also provided with a spline groove (shown in the figure) matched with the first spline 31, the left end of the force limiting rod 3 is inserted into the spline groove of the movable shaft 1, and after passing through the force limiting rod cavity 11, the right end of the force limiting rod extends into the spline groove and then is matched with the spline groove 21 of the fixed shaft 2.
The force limiting nut 41 is received in the force limiting nut cavity 12 and is clearance fit. The force limiting nut cavity 12 is hexagonal and exactly matches the shape of the outer surface of the force limiting nut 41. When the moving shaft 1 rotates, the force limiting nut 41 can be pushed to rotate together, meanwhile, the moving shaft 1 does not limit the movement of the force limiting nut 41 along the axial direction, and the force limiting nut 41 is in threaded connection with the force limiting thread part 42, so that in the rotating process of the follow-up moving shaft 1, the force limiting nut 41 gradually moves along the axial direction towards the direction of the fixed shaft 2.
In some embodiments of the present invention, as shown in fig. 2, the present invention further comprises an adaptive adjusting assembly 5, wherein the adaptive adjusting assembly 5 is connected to the fixed shaft 2 and is used for adjusting the limit position of the force limiting stopping assembly 5;
when the safety belt is pulled out, the safety belt drives the movable shaft 1, the force limiting stopping component 4 and the fixed shaft 2 to synchronously rotate, the fixed shaft 2 drives the adaptive adjusting component 5 to move, the moving stroke of the adaptive adjusting component 5 is related to the pulling-out stroke of the safety belt 10, and the moving stroke is also related to the force limiting stopping stroke of the force limiting stopping component 4.
Specifically, the adaptive adjustment assembly 5 is able to move as the belt 10 is withdrawn from the stroke during normal use of the belt 10. The more the withdrawal stroke of the safety belt 10, the greater the movement stroke of the adaptive adjustment assembly 5; the smaller the pull-out stroke, the smaller the movement stroke of the adaptative adjustment assembly 5.
For example: when a large or fat passenger uses the safety belt, the pull-out stroke of the safety belt 10 is large, and the adaptive adjusting component 5 is driven by the fixed shaft 2 to move by a large moving stroke.
When a smaller or thinner occupant uses the belt, the belt 10 is withdrawn with a smaller travel, and the adaptive control unit 5 is moved with a smaller travel.
The travel of the adaptive adjustment assembly 5 determines the force limit stop travel of the force limit stop assembly 4. For example: when the moving stroke of the self-adaptive adjusting component 5 is larger, the force limiting stopping stroke of the force limiting stopping component 4 is smaller; when the moving stroke of the adaptive adjustment assembly 5 is small, the force limit stopping stroke of the force limit stopping assembly 4 is large.
In some embodiments of the present invention, the moving stroke of the adaptive adjustment assembly 5 includes a large stroke and a small stroke, when the pulling stroke of the safety belt 10 is small, the moving stroke is a small stroke, and the force-limiting stopping stroke is large; when the withdrawal stroke of the webbing 10 is large, the movement stroke is large, and the force limit stop stroke is small.
Further, the larger the large stroke, the smaller the force limit stop stroke.
Alternatively, the moving stroke of the adaptive adjusting assembly 5 may set a critical point, and when the critical point is not exceeded, the force limiting and stroke stopping have no influence; when the critical point is exceeded, the force limiting stop stroke is limited, and the larger the movement stroke is, the smaller the force limiting stop stroke is.
In some embodiments of the present invention, as shown in fig. 2, the adaptive adjustment assembly 5 includes a moving threaded portion 51, a moving disk 52 and a moving pin 53, the moving threaded portion 51 is fixedly connected to the fixed shaft 2, the moving disk 52 is threadedly connected to the moving threaded portion 51, one end of the moving pin 53 is inserted into the fixed shaft 2 and can move along the fixed shaft 2 in the axial direction, the other end of the moving pin 53 abuts against the moving disk 52, and the moving disk 52 rotates relative to the moving pin 53;
when the seat belt is pulled out, the seat belt rotates the fixed shaft 2, the movable threaded portion 51 rotates relative to the movable disk 52, the movable disk 52 moves relative to the fixed shaft 2 in the axial direction gradually approaching, and the movable disk 52 pushes the movable pin 53 to move in the axial direction relative to the fixed shaft 2.
Specifically, as shown in fig. 7, the movable screw portion 51 is fixed to the right end surface of the fixed shaft 2, and the movable screw portion 51 is a stud.
As shown in fig. 8, the movable plate 52 is provided with a screw hole 523, a guide groove 521, and an insertion hole 522, and the movable screw portion 51 is screwed into the screw hole 523 and then inserted into the right cosmetic cover 7. The guide groove 521 abuts on the right end surface of the moving pin 53, and the moving pin 53 can slide in the annular guide groove 521. The receptacle 522 engages a detent 542 of the tape sensing pad 54, as will be described in greater detail below.
As shown in fig. 6 to 7, the fixed shaft 2 includes a fixed plate 22, and two pin holes 23 corresponding to the moving pins 53 are formed in the fixed plate 22.
As shown in fig. 10, the left ends of the two moving pins 53 are inserted into the fixed shaft 2, and the right ends thereof abut against the moving plate 52.
Before collision, when the safety belt 10 is normally used, the safety belt 10 is pulled out, the safety belt 10 drives the movable shaft 1 to rotate, and the force limiting rod 3 and the fixed shaft 2 synchronously rotate. The moving screw portion 51 rotates together with the fixed shaft 2, and the moving disk 52 moves in the axial direction toward the fixed shaft 2 (the arrow direction in fig. 10) due to the screw coupling of the moving screw portion 51 with the screw hole 523 of the moving disk 52. The moving disk 52 pushes the two moving pins 53 to move in the axial direction toward the fixed shaft 2. The greater the pull-out stroke of the webbing 10, the greater the movement stroke of the moving pin 53.
In the initial state of fig. 10, the force limiting nut 41 is axially spaced from the fixed shaft 2 by a distance corresponding to the maximum value of the force limiting stop stroke.
Further, as shown in fig. 11, when the moving pin 53 does not pass through the fixed shaft 2, the limit position of the force limit stopping unit 4 is the end surface of the fixed shaft 2;
as shown in fig. 12, when the moving pin 53 passes through the fixed shaft 2, the limit position of the force limit stop unit 4 is the end of the moving pin 53.
Specifically, as shown in fig. 11, when a small-sized occupant uses the seatbelt 10, the withdrawal stroke of the seatbelt 10 is small, and the movement stroke of the moving pin 53 is also small. The moving pin 53 moves leftward, and does not pass through the left end surface of the fixed shaft 2.
After the collision, the movable shaft 1 and the force limiting rod 2 rotate to drive the force limiting nut 41 to face the direction of the fixed shaft 2 (arrow direction in fig. 11), and when the force limiting nut 41 contacts the left end face of the fixed shaft 2, namely the left end face of the fixed plate 22. The force limiting nut 41 is no longer moved, so that the movable shaft 1 and the force limiting rod 3 are limited from further rotation, and the safety belt 10 cannot be pulled out continuously.
At this time, since the pull-out stroke of the seat belt 10 for a small-sized occupant in normal use is small, the force limit stop stroke of the force limit stop assembly 4 is relatively large at the force limit stop stage. In a collision, the seat belt 10 is pulled out to a long length at the force limit stage, and is suitable for a passenger with a small size. Since the small-sized occupant has a weak chest carrying capacity and is seated far from the front, the force limiting stage should be long and the time for activating the force limiting/stopping function should be short.
In this embodiment, the force limit stop stroke is kept constant at the maximum value and the start time of the force limit stop function is also kept constant until the moving pin 53 does not pass through the fixed shaft 2.
As shown in fig. 12, when a large-sized occupant uses the seatbelt 10, the withdrawal stroke of the seatbelt 10 is large, and the movement stroke of the moving pin 53 is also large. The moving pin 53 moves leftward and then passes through the left end surface of the fixed shaft 2.
After the collision, the moving shaft 1 and the force-limiting rod 2 rotate to drive the force-limiting nut 41 toward the fixed shaft 2 (arrow direction in fig. 12), and when the force-limiting nut 41 contacts the left end surface of the moving pin 53, the force-limiting nut 41 does not move any more, so that the moving shaft 1 and the force-limiting rod 3 are limited from further rotating, and the safety belt 10 cannot be pulled out.
At this time, since the pull-out stroke of the seat belt 10 of the large occupant in normal use is large, the force limit stop stroke of the force limit stop unit 4 is relatively small at the force limit stop stage. In a collision, the seat belt 10 is pulled out to a short length at the force limit stage, and is suitable for a large-sized passenger. This is because the chest carrying capacity of the large-sized occupant is strong and the distance from the front is short after the occupant is seated, so that the force limit stage should be short and the time for activating the force limit stop function should be short.
In this embodiment, the more the moving pin 53 passes through the fixed shaft 2, the shorter the force limit stop stroke is, and the earlier the start time of the force limit stop function is.
The self-adaptive adjusting component 5 can identify the size of the body type of the passenger and self-adaptively adjust the actuating time of the force limiting stop function, thereby solving the limitation that the single force limiting value can not give consideration to all the body type passengers. In practical use, matched occupant protection schemes can be better provided for occupants of different body types.
In some embodiments of the present invention, as shown in fig. 9, the adaptive adjustment assembly 5 further includes a belt sensing plate 54, the belt sensing plate 54 rotates synchronously with the movable plate 52, and the outer ring of the belt sensing plate 54 is provided with a plurality of teeth 541.
Specifically, the belt sensing plate 54 is provided with a through hole 543, the moving screw portion 51 passes through the through hole 543 and then is connected to the right decorative cover 7, the moving screw portion 51 is in clearance fit with the through hole 543, and the positioning pin 542 is inserted into the insertion hole 522 of the moving plate 52, so that the moving plate 52 and the belt sensing plate 54 rotate synchronously.
The belt sensing disc 54 is installed in the right decorative cover 7, the convex teeth 541 are contacted with the inner wall of the right decorative cover 7, when the moving disc 52 rotates, the belt sensing disc 54 is driven to rotate together, and the convex teeth 541 rub or impact with the inner wall of the right decorative cover 7 to give out sound for reminding that the self-adaptive adjustment process is performed at the moment.
In some embodiments of the invention, the vehicle includes a seatbelt restraint device of any of the embodiments described above.
According to the invention, after the force limiting function is actuated for a period of time, the force limiting function can be stopped from being continuously actuated. In the force limiting actuation stage, the force limiting rod is twisted to stabilize the chest load within the range of the force limiting value; in the force limiting stop stage, the continuously rising webbing tension can continuously restrain the dummy to move forwards, so that the chest movement amount is controlled. The function gives consideration to both regulatory requirements and performance requirements, can use low specification limit value to correspond to 'sensitive' THOR dummy, and avoids the regulation NG caused by the over-standard chest movement amount. The method is favorable for reducing the experiment times and saving the development cost.
When a large-size dummy is used for an experiment, the force limiting function is actuated earlier, the chest movement amount is minimum, and the requirements of regulations are met; when the small dummy is used for experiments, the force limiting function is actuated later, the chest movement amount is slightly larger than that of the large dummy, and the requirements of regulations can still be met. The size of the passenger body type can be identified, the actuation time of the force limiting stop function can be adjusted in a self-adaptive mode, and the limitation that passengers of all body types cannot be considered by a single force limiting value is solved. In practical use, matched occupant protection schemes can be better provided for occupants of different body types.
The foregoing is considered as illustrative only of the principles and preferred embodiments of the invention. It should be noted that, for those skilled in the art, several other modifications can be made on the basis of the principle of the present invention, and the protection scope of the present invention should be regarded.
Claims (8)
1. A safety belt force limiter comprises a movable shaft (1), a fixed shaft (2) and a force limiting rod (3), wherein one end of the force limiting rod (3) is fixedly connected with the movable shaft (1), and the other end of the force limiting rod is fixedly connected with the fixed shaft (2), and the safety belt force limiter is characterized by further comprising a force limiting stopping assembly (4), and the force limiting stopping assembly (4) is installed between the movable shaft (1) and the fixed shaft (2);
before collision, the movable shaft (1), the force limiting rod (3), the force limiting stopping component (4) and the fixed shaft (2) synchronously rotate;
during collision, the fixed shaft (2) is locked and fixed, the movable shaft (1) and the force limiting rod (3) rotate, the movable shaft (1) drives the force limiting stopping component (4) to move, when the force limiting stopping component (4) moves to a limit position, the movement is stopped, and the movable shaft (1) is limited to rotate;
the self-adaptive adjusting component (5) is connected with the fixed shaft (2) and is used for adjusting the limit position of the force limiting stopping component (4);
when the safety belt (10) is pulled out, the safety belt (10) drives the movable shaft (1), the force limiting stopping component (4) and the fixed shaft (2) to synchronously rotate, the fixed shaft (2) drives the adaptive adjusting component (5) to move, the moving stroke of the adaptive adjusting component (5) is related to the pulling-out stroke of the safety belt (10), and the moving stroke is also related to the force limiting stopping stroke of the force limiting stopping component (4);
the adaptive adjusting assembly (5) comprises a movable threaded part (51), a movable disc (52) and a movable pin (53), the movable threaded part (51) is fixedly connected with the fixed shaft (2), the movable disc (52) is in threaded connection with the movable threaded part (51), one end of the movable pin (53) is inserted into the fixed shaft (2) and can move along the axial direction of the fixed shaft (2), the other end of the movable pin (53) abuts against the movable disc (52), and the movable disc (52) rotates relative to the movable pin (53);
when the safety belt (10) is pulled out, the safety belt (10) drives the fixed shaft (2) to rotate, the movable threaded portion (51) rotates relative to the movable disc (52), the movable disc (52) moves relatively in the axial direction gradually approaching the fixed shaft (2), and the movable disc (52) pushes the movable pin (53) to move axially relative to the fixed shaft (2).
2. The safety belt force limiter according to claim 1, characterized in that the force limiting stop assembly (4) comprises a rotating member and a fixed member, the rotating member is movably connected with the moving shaft (1) along the axial direction, the fixed member is fixedly connected with the fixed shaft (2), and the rotating member is matched with the fixed member;
during the collision, moving axis (1) drives rotate synchronous rotation, the mounting is motionless, rotate the piece around the mounting rotates and along axial displacement, works as when rotating the piece along axial displacement to extreme position, moving axis (1) stall.
3. The safety belt force limiter according to claim 2, wherein the rotating member is a force limiting nut (41), the fixing member is a force limiting threaded portion (42), the force limiting nut (41) is mounted on an end portion of the moving shaft (1) facing the fixed shaft (2), the force limiting threaded portion (42) is fixed on an end portion of the fixed shaft (2) facing the moving shaft (1), and the force limiting nut (41) is threadedly connected to the force limiting threaded portion (42).
4. The safety belt force limiter according to claim 3, wherein the moving shaft (1) comprises a force limiting rod cavity (11) and a force limiting nut cavity (12), the moving shaft (1) is cylindrical, the force limiting rod cavity (11) penetrates through the axial direction of the moving shaft (1), one end of the force limiting rod (3) is connected with the moving shaft (1) through a first spline (31), the other end of the force limiting rod penetrates through the force limiting rod cavity (11) and is connected with the fixed shaft (2) through a second spline (32), the force limiting rod (3) is in clearance fit with the force limiting rod cavity (11), the force limiting nut cavity (12) is located at one end of the force limiting rod cavity (11), and the force limiting nut (41) is embedded into the force limiting nut cavity (12).
5. The safety-belt force limiter according to claim 1, wherein the moving stroke includes a large stroke and a small stroke, the moving stroke is the small stroke when the pull-out stroke of the safety belt (10) is small, and the force-limiting stop stroke is large; when the pulling-out stroke of the safety belt (10) is large, the moving stroke is large, and the force limiting stopping stroke is small.
6. The seatbelt force limiter according to claim 5, wherein the larger the large stroke, the smaller the force limiting stop stroke.
7. The safety belt force limiter according to claim 1, characterized in that the limit position of the force limiting stop assembly (4) is the end surface of the fixed shaft (2) when the moving pin (53) does not pass through the fixed shaft (2);
when the moving pin (53) penetrates out of the fixed shaft (2), the limit position of the force limiting stop assembly (4) is the end part of the moving pin (53).
8. An automobile, characterized by comprising the seatbelt force limiter according to any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110599648.5A CN113335225B (en) | 2021-05-31 | 2021-05-31 | Safety belt force limiter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110599648.5A CN113335225B (en) | 2021-05-31 | 2021-05-31 | Safety belt force limiter |
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| CN113335225B true CN113335225B (en) | 2022-11-15 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111439233A (en) * | 2020-05-25 | 2020-07-24 | 重庆光大产业有限公司 | Limit force increases progressively formula coiler |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE112009000994T5 (en) * | 2008-04-23 | 2011-02-17 | GM Global Technology Operations, Inc., Detroit | Seatbelt retractor using an active material actuator |
| DE102008028698B4 (en) * | 2008-06-17 | 2018-12-06 | Key Safety Systems, Inc. | Restraint |
| DE102009024292B4 (en) * | 2009-06-05 | 2014-10-09 | Autoliv Development Ab | Belt retractor for a safety belt of a motor vehicle |
| CN202703499U (en) * | 2012-08-15 | 2013-01-30 | 沈阳金杯锦恒汽车安全系统有限公司 | Force limiting prevention device for automotive safety belt |
| DE102013205690B4 (en) * | 2013-03-28 | 2022-01-13 | Autoliv Development Ab | Belt retractor with a force limiting device |
| CN104494558B (en) * | 2014-12-01 | 2017-09-12 | 延锋百利得（上海）汽车安全系统有限公司 | A kind of Webbing retractor for stopping function with limiter |
| CN207190994U (en) * | 2017-07-27 | 2018-04-06 | 上海汽车集团股份有限公司 | Multistage variable successively decreases limit type safety belt |
| CN108909555B (en) * | 2018-06-12 | 2020-06-19 | 吉利汽车研究院（宁波）有限公司 | Seat device capable of preventing whiplash injury and vehicle |
| CN110217190A (en) * | 2019-06-20 | 2019-09-10 | 浙江吉利控股集团有限公司 | A kind of safety belt force limit system of automatic adaptation passenger type |
| CN110562192A (en) * | 2019-10-16 | 2019-12-13 | 沈阳金杯锦恒汽车安全系统有限公司 | Retractor spindle assembly with force limiting stop function and safety belt retractor |
| CN212890229U (en) * | 2020-07-06 | 2021-04-06 | 上汽大众汽车有限公司 | Self-adaptation limit for strength type safety belt coiler and safety belt subassembly based on magnetic control |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111439233A (en) * | 2020-05-25 | 2020-07-24 | 重庆光大产业有限公司 | Limit force increases progressively formula coiler |
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