CN118061944A

CN118061944A - Safety belt force limiter and automobile

Info

Publication number: CN118061944A
Application number: CN202211483860.6A
Authority: CN
Inventors: 沈惠发
Original assignee: Zf Automotive Passive Safety System Shanghai Co ltd
Current assignee: Zf Automotive Passive Safety System Shanghai Co ltd
Priority date: 2022-11-24
Filing date: 2022-11-24
Publication date: 2024-05-24
Also published as: WO2024109805A1

Abstract

The application provides a safety belt force limiter and an automobile. The force limiter comprises: the bracket is provided with a through hole, and the inner peripheral surface of the through hole is provided with a ratchet wheel; a tape cartridge having a stop pawl accommodating portion; the stop bolt is in transmission connection with the tape winding drum in the axial direction of the tape winding drum; the stop nut is in transmission connection with the belt winding drum, and the inner peripheral surface of the stop nut is in threaded connection with the stop bolt; a stopping claw provided in the stopping claw accommodating portion, the stopping claw having a pawl facing the ratchet, the elastic member normally applying a force to the pawl facing the ratchet; the stop latch is axially penetrated between the tape coiling barrel and the stop nut and presses against the pawl to prevent the pawl from being meshed with the ratchet wheel; when the stop bolt is locked, the winding drum drives the stop nut to synchronously rotate for a preset number of turns, and the stop nut drives the stop bolt to move along the stop bolt in a direction away from the pawl so as to draw the stop bolt away from the pawl, thereby preventing the winding drum from rotating. The seat belt force limiter of the present application can realize a function of forcibly stopping the extraction of the seat belt.

Description

Safety belt force limiter and automobile

Technical Field

The application mainly relates to the technical field of safety belts, in particular to a safety belt force limiter and an automobile.

Background

The seat belt force limiter plays an important role in protecting the safety of a member when a vehicle collides. In the event of a collision, as the occupant moves forward, the length of the belt that is withdrawn increases, and the force applied to the belt by the belt limiter increases, so that the restraining force applied to the occupant by the belt increases. In order to prevent secondary injury caused by excessive restraining force applied by the safety belt to the member, when the restraining force reaches a force limiting value, a force limiting rod in the safety belt force limiter is deformed in a torsion mode, the webbing can be pulled out continuously, and the occupant moves forwards continuously.

For the movement amount of the passenger, the movement amount of the chest of the passenger is between 100mm and 300mm according to the requirements of the regulations GB 16166-2013. In order to meet the regulatory requirements, the amount of movement of the chest of the occupant should be limited.

Therefore, how to ensure that the movement amount of the chest of the occupant satisfies the requirements is a highly desirable problem.

Disclosure of Invention

The application aims to solve the technical problem of providing a safety belt force limiter and an automobile, wherein the safety belt force limiter can ensure that the movement amount of the chest of an occupant meets the requirement.

The technical scheme adopted by the application for solving the technical problems is a safety belt force limiter, comprising: a bracket having a through hole, the inner peripheral surface of which has a ratchet; the tape winding drum penetrates through the through hole and is rotatably arranged on the bracket, and the tape winding drum is provided with a stop claw accommodating part; the stop bolt is in transmission connection with the belt winding drum in the axial direction of the belt winding drum; the stop nut is in transmission connection with the tape winding drum, and the inner peripheral surface of the stop nut is in threaded connection with the stop bolt; a stopping claw provided in the stopping claw accommodating portion, the stopping claw having a pawl facing the ratchet wheel and an elastic member provided between the stopping claw accommodating portion and the pawl, the elastic member normally applying a force to the pawl facing the ratchet wheel; a stop latch axially penetrating between the spool and the stop nut and pressing against the pawl to prevent the pawl from engaging the ratchet; and when the stop bolt is locked, the winding drum drives the stop nut to synchronously rotate for a preset number of turns, and the stop nut drives the stop bolt to move along the stop bolt in a direction away from the pawl so as to withdraw the stop bolt from the pawl, so that the pawl is meshed with the ratchet wheel to prevent the winding drum from rotating.

In one embodiment of the application, the stop nut has a plurality of protrusions located on the outer circumferential surface thereof and protruding in the radial direction.

In one embodiment of the present application, the stop nut has a connection hole extending in an axial direction, the connection hole being disposed on any one of the protrusions, wherein one end of the stop bolt is disposed in the connection hole.

In one embodiment of the present application, the tape cartridge has a stop nut receiving hole having a plurality of grooves on an inner circumferential surface thereof and recessed radially outward, wherein the plurality of protrusions are keyed with the plurality of grooves to drivingly connect the stop nut with the tape cartridge.

In one embodiment of the application, the take-up spool has a through hole extending in an axial direction thereof, and one end of the stop latch is pressed against the pawl through the through hole to prevent the pawl from engaging with the ratchet.

In one embodiment of the application, the stop pawl has a support portion disposed opposite the pawl, wherein the support portion is positioned within the stop pawl receiving portion when the pawl is engaged with the ratchet wheel.

In an embodiment of the application, the device further comprises a force limiting rod, wherein one end of the force limiting rod is in transmission connection with the winding drum, and the other end of the force limiting rod is in transmission connection with the stop bolt.

In one embodiment of the application, the winding drum is provided with a force limiting rod accommodating hole extending along the axial direction, wherein one end of the force limiting rod penetrates through the force limiting rod accommodating hole to be in transmission connection with the winding drum.

In an embodiment of the present application, the outer circumferential surface of the tape cartridge has a plurality of grooves.

The application also provides an automobile for solving the technical problems, and the automobile comprises the safety belt force limiter.

The safety belt force limiter can draw out the stop latch from the stop pawl after the belt winding drum rotates for a preset number of turns when collision occurs, so that the stop pawl is meshed with a ratchet wheel on the bracket, and the function of forcibly stopping the drawing-out of the safety belt is realized.

Drawings

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below, wherein:

FIG. 1 is a schematic perspective view of a seat belt force limiter according to an embodiment of the present application;

FIG. 2 is an exploded view of a seat belt force limiter according to one embodiment of the present application;

FIG. 3 is a schematic cross-sectional view of a seat belt force limiter according to one embodiment of the present application;

FIG. 4 is a schematic front view of a stop nut according to an embodiment of the application;

Fig. 5 is a schematic cross-sectional view of a seat belt force limiter according to an embodiment of the present application.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways than as described herein, and therefore the present application is not limited to the specific embodiments disclosed below.

As used in the specification and in the claims, the terms "a," "an," "the," and/or "the" are not specific to a singular, but may include a plurality, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and they do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present application. Furthermore, although terms used in the present application are selected from publicly known and commonly used terms, some terms mentioned in the present specification may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Furthermore, it is required that the present application is understood, not simply by the actual terms used but by the meaning of each term lying within.

When collision occurs, the safety belt force limiter can forcedly stop the extraction of the safety belt after the safety belt is extracted by a preset distance, so that the movement amount of the chest of an occupant is ensured to meet the requirement.

The seatbelt force limiter of the present application will be described below by way of specific examples.

Fig. 1 is a schematic perspective view of a force limiter according to an embodiment of the present application, and fig. 2 is an exploded view of a seat belt force limiter according to an embodiment of the present application. As shown in fig. 1 and 2, the webbing limiter 100 includes a bracket 110, a spool 120, a stop bolt 130, a stop nut 140, a stop pawl 150, a stop latch 160, and a force limiting lever 170. As shown in fig. 1 and 2, one end of the force limiting rod 170 is connected to the winding drum 120, the other end is connected to the stop bolt 130, the inner circumferential surface of the stop nut 140 is in threaded connection with the outer circumferential surface of the stop bolt 130, the stop pawl 150 is disposed in the stop pawl receiving portion of the winding drum 120, and the stop latch 160 is axially inserted between the winding drum 120 and the stop nut 140 and presses against the pawl of the stop pawl 150 to prevent the pawl from engaging with the ratchet wheel on the bracket 110.

Before the vehicle collides, the winding drum 120, the stop bolt 130 and the stop nut 140 rotate synchronously, and both ends of the force limiting rod 170 are respectively connected with the winding drum 120 and the stop bolt 130, which are also driven to rotate around the own axis by the winding drum 120 and the stop bolt 130, and the stop latch 170 rotates together with the winding drum 120 and the stop nut 140. In the event of a crash, the stop bolt 130 is locked, the spool 120, the stop nut 140 and the force limiting lever 170 rotate, and the stop latch 160 rotates with the spool 120 and the stop nut 140. When the stop nut 140 rotates, the stop nut 140 simultaneously moves along the axial direction of the winding drum 120 towards the stop bolt 130 and drives the stop latch 160 connected with the stop nut to move along the axial direction of the winding drum 120 towards the stop bolt 130, and after the winding drum 120 rotates for a preset number of turns, the stop latch 160 is pulled away from the stop pawl 150, so that the pawl of the stop pawl 150 is meshed with the ratchet wheel on the frame 110, and the winding drum 120 is prevented from continuing to rotate.

Specifically, fig. 3 is a schematic cross-sectional view of a seat belt force limiter according to an embodiment of the present application, the cross-sectional view being from the left side in fig. 1. As shown in fig. 2 and 3, the bracket 110 has a first through hole 111, and as shown in fig. 3, an inner circumferential surface of the first through hole 111 has a ratchet 111a. In addition, referring to fig. 2, the bracket 110 further has a second through hole 112. As shown in fig. 1, the tape cartridge 120 is disposed through the first through hole 111 and the second through hole 112 of the bracket 110.

As shown in fig. 1 and 2, the tape cartridge 120 is rotatably disposed on the bracket 110 through the inside of the first through hole 111 and the second through hole 112 of the bracket. A seat belt (not shown) may be wrapped around the outer surface of the spool 120. When the webbing is pulled, the webbing brings the spool 120 into rotation. Further, as shown in fig. 2, the tape cartridge 120 has a stop pawl accommodating portion 121. As shown with reference to fig. 3, the stopping jaw receiving part 121 may be used to receive the stopping jaw 150. In fig. 3, the stop pawl receiving portion 121 has a step 121a and the stop pawl 150 has a step 152 that mates with it. When the stopping pawl 150 is placed in the stopping pawl receiving part 121, the steps of the two are matched, so that the stability of the stopping pawl 150 can be maintained. It will be appreciated that the shape of the stop receiving portion and the manner of its engagement with the stop pawl in the present application is not limited to the above-described embodiments.

In one embodiment, as shown in FIG. 2, the outer circumference of the tape cartridge 120 has a plurality of grooves 122. By providing the grooves 122 on the spool 120, the material of the spool 120 is reduced, thereby reducing the cost and weight of the belt limiter.

Referring to fig. 2, the stop bolt 130 is drivingly connected to the spool 120 in the axial direction of the spool 120. Specifically, the force limiting lever 170 has splines at both the first end 171 and the second end 172, and the first end 171 and the second end 172 are in driving connection with the stop bolt 130 and the spool 120, respectively. In one embodiment, the bottom of the bore 131 of the stop bolt 130 is provided with a recess that mates with the spline of the first end 171, and after the force limiting rod 170 is connected to the stop bolt 130, the spline of the first end 171 mates with the recess in the bore 131, thus allowing a driving connection between the force limiting rod 170 and the stop bolt 130. Further, in this embodiment, the spool 120 has an axially extending force limiting rod receiving aperture (not shown) having a recess in the bottom thereof that mates with the spline of the second end 172, and upon connection of the force limiting rod 170 to the spool 120, the spline of the second end 172 mates with the recess in the bottom thereof, such that a driving connection between the force limiting rod 170 and the spool 120 is achieved.

After the first end 171 and the second end 172 of the force limiting rod 170 are in driving connection with the stop bolt 130 and the spool 120, respectively, the spool 120 drives the stop bolt 130 to rotate together through the force limiting rod 170 when the seat belt is drawn out before a collision. In the event of a crash, the stop bolt 130 is locked, and at this time, although the spool 120 continues to rotate when the webbing is pulled out, the spool 120 can continue to apply torsion to the stop bolt 130 via the force limiting lever 170, the stop bolt 130 cannot rotate because the stop bolt 130 is locked.

With continued reference to fig. 2, the stop nut 140 is drivingly connected to the spool 120, and the inner circumferential surface 141 of the stop nut 140 is threadably connected to the outer circumferential surface 132 of the stop bolt 130. Thus, when the stop nut 140 is rotated by the spool 120 after the stop bolt 130 is locked, the stop nut 140 is simultaneously moved toward the stop bolt 130 along the axial direction of the spool 120.

Specifically, fig. 4 is a schematic front view of a stop nut according to an embodiment of the present application. Referring to fig. 4, the stop nut 140 has a plurality of protrusions 143 located at an outer circumferential surface 142 thereof and protruding in a radial direction. Correspondingly, the tape cartridge 120 has a stop nut receiving hole (not shown) having a plurality of grooves on its inner circumferential surface and recessed radially outward. When the stop nut 140 is placed in the stop nut receiving hole, the plurality of protrusions 143 of the stop nut 140 are engaged with the grooves in the stop nut receiving hole, so that the stop nut 140 rotates as the tape cartridge 120 rotates. The number and shape of the protrusions 143 in fig. 4 are merely exemplary, and the number, shape, and specific positions on the outer circumferential surface of the protrusions 143 in fig. 4 may be changed according to the need.

Further, as shown in fig. 4, the stop nut 140 has a coupling hole 144 extending in an axial direction, which is provided on any one of the protrusions 143, and one end of the stop bolt may be coupled with the coupling hole 144.

Returning to fig. 2, the stop latch 160 is axially disposed between the spool 120 and the stop nut 140. The manner of connection between the stop latch and the spool and stop nut will be described in detail below by way of example.

First, fig. 5 is a schematic cross-sectional view of a seat belt force limiter according to an embodiment of the present application, and reference is made to fig. 5. The stop latch 160 may be coupled with the stop nut 140 by disposing a first end 161 thereof within a coupling hole of the stop nut 140. The first end 161 and the stop nut 140 are connected in such a manner that the stop nut 140 pulls the stop latch 160 to move toward the stop bolt 130 in the axial direction.

Next, referring to fig. 5, the tape cartridge 120 has a through hole 123 extending in the axial direction thereof. The stop latch 160 is disposed through the through hole 123. When the spool 120 rotates, the stop latch 160 rotates therewith.

Therefore, when the stop bolt is locked, the winding drum can drive the stop nut to rotate, and the stop nut drives the stop bolt to move towards the stop bolt along the axial direction.

The structure and function of the stopping pawl of the present application will be described below by way of examples.

Referring to fig. 2, the stop pawl 150 is provided in the stop pawl accommodating portion 121, and the stop pawl 150 has an orientation pawl 151. Referring to fig. 3, when the stopping pawl 150 is provided in the stopping pawl receiving part 121, the pawl 151 faces the ratchet 111a, and an elastic member (not shown) is provided between the stopping pawl receiving part and the pawl 151, and normally applies a force to the pawl 151 toward the ratchet 111 a. In one embodiment, referring to fig. 3, the stopping jaw 150 has a support portion 153 disposed opposite to the pawl 151. The pawl 151 can be engaged with the ratchet 111 a. When the pawl 151 is engaged with the ratchet 111a, the support portion 153 is located in the pawl receiving portion, so that a case where "one end of the pawl 150 where the pawl 151 is located is engaged with the ratchet 111a of the holder 110, and one end of the support portion 153 is located in the spool 120" is formed, since the holder 110 is stationary, the rotation of the spool 120 can be prevented by the pawl 150, and the withdrawal of the webbing can be restricted.

As shown in connection with fig. 3 and 5, before a crash occurs, the second end 162 of the stop latch 160 is pressed against the pawl 151 through the through hole 123 of the spool 120 to prevent the pawl 151 from engaging the ratchet 111a under the influence of elastic force. When the stop bolt 130 is locked after collision, the passenger moves forward due to inertia and withdraws the safety belt, so as to drive the winding drum 120 to rotate, and after the winding drum 120 drives the stop nut 140 to synchronously rotate for a preset number of turns, the stop nut 140 drives the stop latch 160 to withdraw from the pawl 151, so that the pawl 151 is meshed with the ratchet wheel 111a, and the winding drum 120 is prevented from rotating. The present application does not limit the preset number of turns, and for example, the preset number of turns may be calculated according to the webbing extraction distance specified by the regulations.

When collision occurs, after the belt winding drum rotates for a preset number of turns, the safety belt force limiter in the embodiment enables the stop pawl to be meshed with the ratchet wheel on the bracket by pulling the stop latch away from the stop pawl, and further achieves the function of forcibly stopping pulling out the safety belt.

In a further aspect the application provides a vehicle comprising a seat belt force limiter as described above. When collision occurs, after the belt winding drum rotates for a preset number of turns, the safety belt force limiter of the automobile is used for pulling out the stop latch from the stop pawl, so that the stop pawl is meshed with the ratchet wheel on the bracket, and the function of forcedly stopping the pulling-out of the safety belt is realized.

While the basic concepts have been described above, it will be apparent to those skilled in the art that the foregoing application disclosure is by way of example only and is not intended to be limiting. Although not explicitly described herein, various modifications, improvements and adaptations of the application may occur to one skilled in the art. Such modifications, improvements, and modifications are intended to be suggested within the present disclosure, and therefore, such modifications, improvements, and adaptations are intended to be within the spirit and scope of the exemplary embodiments of the present disclosure.

Meanwhile, the present application uses specific words to describe embodiments of the present application. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the application. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the application may be combined as suitable.

In some embodiments, numbers describing the components, number of attributes are used, it being understood that such numbers being used in the description of embodiments are modified in some examples by the modifier "about," approximately, "or" substantially. Unless otherwise indicated, "about," "approximately," or "substantially" indicate that the number allows for a 20% variation. Accordingly, in some embodiments, numerical parameters set forth in the specification and claims are approximations that may vary depending upon the desired properties sought to be obtained by the individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and employ a method for preserving the general number of digits. Although the numerical ranges and parameters set forth herein are approximations in some embodiments for use in determining the breadth of the range, in particular embodiments, the numerical values set forth herein are as precisely as possible.

Claims

1. A seat belt force limiter, comprising:

A bracket having a through hole, the inner peripheral surface of which has a ratchet;

The tape winding drum penetrates through the through hole and is rotatably arranged on the bracket, and the tape winding drum is provided with a stop claw accommodating part;

The stop bolt is in transmission connection with the belt winding drum in the axial direction of the belt winding drum;

the stop nut is in transmission connection with the tape winding drum, and the inner peripheral surface of the stop nut is in threaded connection with the stop bolt;

A stopping claw provided in the stopping claw accommodating portion, the stopping claw having a pawl facing the ratchet wheel and an elastic member provided between the stopping claw accommodating portion and the pawl, the elastic member normally applying a force to the pawl facing the ratchet wheel;

A stop latch axially penetrating between the spool and the stop nut and pressing against the pawl to prevent the pawl from engaging the ratchet; and

When the stop bolt is locked, the belt winding barrel drives the stop nut to synchronously rotate for a preset number of turns, and the stop nut drives the stop bolt to move along the stop bolt in a direction away from the pawl so as to pull the stop bolt away from the pawl, so that the pawl is meshed with the ratchet wheel, and the belt winding barrel is prevented from rotating.

2. The force limiter of claim 1, wherein the stop nut has a plurality of protrusions located on an outer peripheral surface thereof and protruding in a radial direction.

3. The force limiter of claim 2, wherein the stop nut has an axially extending attachment bore disposed on any of the protrusions, wherein one end of the stop latch is disposed within the attachment bore.

4. A force limiter according to claim 2 wherein the spool has a stop nut receiving bore having a plurality of grooves in an inner peripheral surface thereof recessed radially outwardly, wherein the plurality of projections are keyed to the plurality of grooves to drivingly connect the stop nut to the spool.

5. A force limiter according to claim 1 wherein the take-up spool has a through bore extending axially therethrough through which one end of the stop latch is pressed against the pawl to prevent engagement of the pawl with the ratchet wheel.

6. The force limiter of claim 1, wherein the stop pawl has a support portion disposed opposite the pawl, wherein the support portion is positioned within the stop pawl receiving portion when the pawl is engaged with the ratchet wheel.

7. The force limiter of claim 1, further comprising a force limiting lever having one end drivingly connected to the spool and the other end drivingly connected to the stop bolt.

8. A force limiter according to claim 7 wherein the take-up spool has an axially extending force limiting rod receiving bore, wherein one end of the force limiting rod is drivingly connected to the take-up spool through the force limiting rod receiving bore.

9. A force limiter according to claim 1 wherein the outer peripheral surface of the tape cartridge has a plurality of grooves.

10. An automobile comprising a seat belt force limiter according to any one of claims 1 to 9.