JP2004230991A - Seat belt device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat belt device improved in a property for protecting a passenger's body in the condition that a force limiter is operated when quickly decelerating a vehicle, and facilitated in installation thereof in a vehicle. <P>SOLUTION: In this seat belt device 10, when a pre-tensioner 34 quickly decelerates a vehicle, a winding shaft 36 is rotated around the center axis in a direction expressed with an arrow CCW, and a webbing 12 is tightly brought in contact with a body of a passenger to improve the protecting property. Furthermore, since the tensile force is continuously applied to the webbing 12, an outside wrap belt 50 fastens an inside wrap belt 48 in the winding shaft 36 to limit sliding of the webbing 12 in relation to the winding shaft 36. Even in the condition that the force limiter of a retractor 14 is operated, a waist part of the passenger is surely bound by the wrap belt 50. Since the retractor 14 and the pre-tensioner 34 are separately provided, they are easily installed in a vehicle 16. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a seat belt device for restraining a vehicle occupant's body by continuous webbing.
[0002]
[Prior art]
2. Description of the Related Art A vehicle such as an automobile is provided with a seat belt device for protecting an occupant in a collision or the like. As such a seatbelt device, there is a three-point seatbelt device using continuous webbing.
[0003]
In this seat belt device, one end of the webbing is locked by a winding shaft provided on the retractor, the intermediate portion passes through a slip joint fixed to the upper portion of the center pillar, and the other end is locked by an anchor plate. ing. A tongue plate is provided at an intermediate portion between the anchor plate and the slip joint of the webbing, and by locking the tongue plate to a buckle provided on the side of the seat, the webbing can be moved from the retractor. It is pulled out to be in the mounted state. In this mounting state, an intermediate portion (a so-called “shoulder belt”) between the slip joint of the webbing and the tongue plate (buckle) restrains the upper body of the occupant, and an intermediate portion between the tongue plate and the anchor plate of the webbing. A part (so-called “lap belt”) restrains the occupant's waist.
[0004]
By the way, in the case where the retracting mechanism of the retractor prevents the webbing from being pulled out in the vehicle sudden deceleration state or the like, the upper body of the occupant may be impacted by the shoulder belt due to the inertial energy of the occupant. Therefore, when the load applied to the shoulder belt exceeds a predetermined value, the retractor allows the webbing to be pulled out by a predetermined amount, and the shoulder belt portion of the webbing is pulled out by a predetermined amount. There is a retractor provided with a mechanism for absorbing and reducing (a so-called “force limiter mechanism”).
[0005]
However, in the three-point seat belt device using the continuous webbing, when the shoulder belt portion of the webbing is pulled out by a predetermined amount, there is a possibility that the lap belt continuous with the shoulder belt may be loosened, which may affect the restraint. There is.
[0006]
On the other hand, a seat belt device has been proposed in which a shoulder belt and a lap belt are divided into separate bodies and separately locked on one tongue plate in order to suppress the rise of the lap belt with respect to the abdomen of the occupant. (For example, refer to Patent Document 1).
[0007]
In the seat belt device disclosed in Patent Literature 1, since the shoulder belt and the lap belt are not continuous, even if the shoulder belt is pulled out by a predetermined amount, the restraint of the lap belt is not affected.
[0008]
Further, in the seat belt device disclosed in Patent Literature 1, the shoulder belt and the lap belt are respectively wound around individual retractors, and an auxiliary mechanism (for example, a so-called “direct”) provided on each retractor is provided. The amount of extension (extension) of the shoulder belt and the lap belt when the lock mechanism of the retractor is activated in a vehicle sudden deceleration state or the like is individually adjusted by a "clamp mechanism" or a "pretensioner mechanism". It is configured to be able to. For example, the force limiter mechanism is provided on a retractor on the shoulder belt side, and the pretensioner mechanism is provided on the retractor on the lap belt side (a mechanism for pulling a predetermined amount of webbing toward the retractor side in a vehicle deceleration state or the like to improve the restraint of the webbing. ), The shoulder belt is pulled out by a predetermined amount, so that the impact that the occupant's upper body receives from the shoulder belt can be absorbed and reduced, and the lap belt is drawn into the retractor side by a predetermined amount. Thereby, the restraint of the lap belt can be improved.
[0009]
However, in order to provide each retractor with an auxiliary mechanism such as a force limiter mechanism or a pretensioner mechanism, it is necessary to increase the size of the retractor itself. For this reason, it may be difficult to install the enlarged retractor at an appropriate position of the vehicle (for example, near the lower end of the center pillar or under a seat). For example, in a small car, there is not enough room in the cabin, so the retractor on the lap belt side, which has a large size with a pretensioner mechanism as described above, is installed at an appropriate position such as near the lower end of the center pillar. Hard to do. If the large retractor is installed at an inappropriate position, there is a problem that it obstructs the occupants and deteriorates the appearance of the passenger compartment.
[0010]
[Patent Document 1]
JP-A-11-20613
[Problems to be solved by the invention]
The present invention, in consideration of the above facts, in a state where the force limiter mounted on the retractor is operated, for example, in a vehicle sudden deceleration state, the shock received by the upper body of the occupant from the shoulder belt is absorbed and reduced, and An object of the present invention is to provide a seat belt device in which the occupant's waist is reliably restrained by a lap belt, which improves the restraint of the occupant's body and is easy to install in a vehicle.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, a seat belt device according to the invention described in claim 1 includes a tongue plate that engages with a buckle provided on a side of a vehicle seat and a retractor having a base end portion having a force limiter. The webbing is wound around, the intermediate portion is slidably wound around the tongue plate, and the tip portion is provided on a side of the seat opposite to the buckle, the center being provided on a side opposite to the buckle. It has a pair of winding portions arranged along the axis, and an intermediate portion between the portion of the webbing wound around the tongue plate and the tip portion can slide on one of the pair of winding portions. A winding shaft wound around, and connected to the winding shaft, upon detection of a predetermined acceleration due to rapid deceleration of the vehicle, of the webbing intermediate portion between the tongue plate and the winding shaft, The winding shaft is disposed in a direction in which the webbing intermediate portion on the distal end side locked on the tongue plate is wound around the webbing intermediate portion on the retractor side wound around the tongue plate. And a winding drive source that rotates around a central axis.
[0013]
Incidentally, a so-called "pretensioner mechanism" can be applied as the winding drive source according to the first aspect.
[0014]
In the seat belt device according to the first aspect, when the occupant sits on the seat of the vehicle and wears the seat belt, the tongue plate is pulled in the direction of the buckle provided on the side of the seat of the vehicle. As a result, the base end portion is wound around the retractor, the intermediate portion is wound around the tongue plate, and the webbing whose distal end portion is locked on the tongue plate is pulled out from the retractor. At this time, the webbing is pulled out while sliding on the winding portion of the tongue plate and the winding portion of the winding shaft provided on the side opposite to the buckle of the seat. Then, the tongue plate is supported by the buckle by being engaged with the buckle, and the occupant is in a state where the webbing is mounted.
[0015]
In this mounting state, the upper body side webbing of the occupant is a shoulder belt. On the other hand, on the waist side of the occupant, the webbing is wound around the winding shaft and is folded back, and the waist of the occupant is double-folded between the tongue plate and the winding shaft. It is restrained by the middle part. That is, an intermediate portion of the webbing on the retractor side wound around the tongue plate (hereinafter, referred to as a first lap belt), and an intermediate portion of the webbing on the distal end side fixed to the tongue plate (hereinafter, referred to as a second lap belt). ) Restrains the occupant's waist.
[0016]
In this state, when the locking mechanism of the retractor operates in the vehicle sudden deceleration state or the like, an inertial force acts on the occupant's body and a high load acts on the webbing. At this time, the webbing may be slightly pulled out from the retractor, and the restraining force of the webbing may decrease.
[0017]
In this case, the winding drive source detects a predetermined acceleration due to rapid deceleration of the vehicle, and rotates the winding shaft around the central axis. For this reason, the pair of winding portions arranged along the center axis of the winding shaft rotates, and the intermediate portion of the webbing wound around one of the pair of winding portions is wound into the other of the pair of winding portions. And wound on the winding shaft. Thus, the webbing is in close contact with the occupant's body, and the occupant's body is reliably restrained by the webbing.
[0018]
The direction of rotation of the winding shaft during this rotation is such that the second lap belt (the webbing intermediate portion on the distal end side locked on the tongue plate) is wound around the first lap belt (the tongue plate). The webbing is wound around the webbing intermediate portion on the retractor side).
[0019]
Further, tension is applied to the webbing due to the inertial force of the occupant who is still moving forward of the vehicle, and the webbing intermediate portion (the first lap belt and the second lap belt) is wound around the winding shaft. Continuous portion) is wound around the winding shaft. At this time, the second wrap belt wound around the outside is in a state in which the first wrap belt wound around the inside is tightly wound. Is strongly sandwiched between the winding shaft and the second lap belt. This limits the sliding of the webbing with respect to the winding shaft.
[0020]
Therefore, the force limiter of the retractor is operated, the shoulder belt portion of the webbing is pulled out, and the continuous portion of the shoulder belt and the first lap belt slides on the wrap portion of the tongue plate, thereby causing the first belt to slide. Even when the lap belt is slackened, the second lap belt is prevented from being slackened. Accordingly, the waist of the occupant is reliably restrained by the second lap belt (the webbing intermediate portion on the distal end side locked on the tongue plate).
[0021]
That is, by the operation of the force limiter of the retractor, the impact received by the upper body of the occupant from the shoulder belt is absorbed and reduced, and the lumbar portion of the occupant is at least one side of the double-folded webbing which is a lap belt. It is definitely bound.
[0022]
In addition, since the retractor and the take-up drive source are separated from each other, the size of the retractor can be reduced as compared with a case where a drive source for retracting the webbing is provided in the retractor. Accordingly, the retractor can be easily installed on the vehicle, and the winding drive source can be freely installed on the vehicle.
[0023]
As described above, in the seat belt device according to the first aspect, when the force limiter mounted on the retractor is operated, for example, when the vehicle is rapidly decelerated, the impact received by the upper body of the occupant from the shoulder belt is absorbed and reduced. Moreover, the occupant's waist is reliably restrained by the lap belt, so that the restraint of the occupant's body is improved, and furthermore, installation on the vehicle is easy.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a front view showing a configuration of a seat belt device 10 according to an embodiment of the present invention.
[0025]
The seat belt device 10 includes one continuous webbing 12 for restraining an occupant. A base end (not shown) of the webbing 12 is engaged with a spool (not shown) of a retractor 14 having a force limiter (not shown). The retractor 14 is fixedly disposed near the lower end of the center pillar 18 of the vehicle 16, and the spool is constantly urged in the winding rotation direction of the webbing 12 by the urging force of a mainspring (not shown).
[0026]
The webbing 12 has an intermediate portion inserted into a slip joint 20 provided above the center pillar 18 and folded back, and is inserted into an insertion hole 24 which is a long hole formed substantially in the center of the tongue plate 22. It is slidably wound. The tongue plate 22 is supported by engaging an engaging portion 26 (see FIG. 2) formed on the distal end side with a buckle 30 disposed on the side of the seat 28 opposite to the center pillar 18. .
[0027]
Further, the intermediate portion of the webbing 12 is further wound around one of the two rod-shaped guides 32 fixed side by side on the side surface of the seat 28 on the center pillar 18 side, on one of the seat 28 sides, It is bent in the direction of a pretensioner 34 which is fixedly arranged on the floor of the vehicle 16 near the lower end of the center pillar 18 and is a winding drive source. As shown in FIG. 2, a cylindrical take-up shaft 36 is connected to the pretensioner 34 on the front side of the vehicle. The pretensioner 34 rotates the winding shaft 36 around the central axis and in the direction of the arrow CCW in FIG. 3A when detecting acceleration due to rapid deceleration of the vehicle 16.
[0028]
A longitudinal groove-like slit 38 is formed in the winding shaft 36 from the front end to the middle part. The semicircular portions on both sides of the slit 38 are formed as a pair of winding portions 40. The intermediate portion of the webbing 12 is inserted into the slit 38 in the width direction, and is wound around one of the pair of winding portions 40 (the left side in FIG. 2) and folded.
[0029]
Further, an intermediate portion of the webbing 12 is wound around a guide 32 on the side of the center pillar 18 and is bent in the direction of the tongue plate 22. The distal end portion 42 of the webbing 12 is inserted into an elongated hole 44 formed on the base end side of the tongue plate 22 and is folded back, and is locked at a portion before the folding back.
[0030]
Next, the operation of the first embodiment will be described.
[0031]
In the seat belt device 10 having the above-described configuration, when the occupant sits on the seat 28 of the vehicle 16 and wears the seat belt, the tongue plate 22 is pulled in the direction of the buckle 30 provided on the side of the seat 28, and the webbing 12 is withdrawn from retractor 14. At this time, the webbing 12 is pulled out while sliding on one of the pair of winding portions 40 of the winding shaft 36 and the insertion hole 24 of the tongue plate 22. Then, the tongue plate 22 is supported by the buckle 30 by being engaged with the buckle 30, and the occupant is in a state where the webbing 12 is mounted (the state shown in FIG. 1).
[0032]
In this mounting state, the upper body side webbing 12 of the occupant is used as the shoulder belt 46. On the other hand, on the lumbar side of the occupant, the webbing 12 is wound around the winding shaft 36 and folded back, and the lumbar portion of the occupant is located between the tongue plate 22 and the winding shaft 36 as shown in FIG. It is restrained by the lap belt 48 and the lap belt 50 that are wrapped around in a heavily folded state. That is, the intermediate portion of the webbing 12 on the retractor 14 (wrap belt 48) wound around the tongue plate 22 and the intermediate portion of the webbing 12 on the distal end portion 42 (lap belt 50) locked on the tongue plate 22, The occupant's waist is restrained.
[0033]
In this state, when the locking mechanism of the retractor 14 is operated, for example, when the vehicle 16 is suddenly decelerated, an inertial force acts on the occupant's body and a high load acts on the webbing 12. At this time, the webbing 12 may be slightly pulled out from the retractor 14 and the restraining force of the webbing 12 may be reduced.
[0034]
In this case, the pretensioner 34 detects a predetermined acceleration due to the rapid deceleration of the vehicle 16 and moves the winding shaft 36 around the central axis and the arrow CCW in FIGS. 3 (A) and 4 (A). (In FIGS. 4A to 4C, the vehicle 16 and the seat 28 are not shown.) For this reason, the intermediate portion of the webbing 12 wound around one of the pair of winding portions 40 was wound around the other of the pair of winding portions 40, and the lap belt 50 was wound around the lap belt 48 outside. In this state, it is wound around the winding shaft 36 (the state shown in FIGS. 3B and 4B). Thereby, the webbing 12 is in close contact with the occupant's body, and the occupant's body is reliably restrained by the webbing 12.
[0035]
Further, tension is applied to the webbing 12 due to the inertial force of the occupant who still moves forward of the vehicle 16, and the webbing 12 is wound around the winding shaft 36 at an intermediate portion (the lap belt 48 and the lap belt 50). Is wound around the winding shaft 36. At this time, since the outer lap belt 50 is in a state in which the inner wrap belt 48 is tightly wound, the tension applied to the outer wrap belt 50 causes the inner wrap belt 48 to move between the winding shaft 36 and the lap belt 50. It is strongly sandwiched between. Thereby, sliding of the webbing 12 with respect to the winding shaft 36 is restricted.
[0036]
Therefore, the force limiter of the retractor 14 is operated, and the shoulder belt 46 portion of the webbing 12 is pulled out (the state shown in FIG. 3C), and the continuous portion of the shoulder belt 46 and the lap belt 48 is the tongue plate 22. Even when the lap belt 48 is slackened by sliding in the insertion hole 24 (the state shown in FIG. 4C), the lap belt 50 is prevented from being slackened. As a result, the lap of the occupant is securely restrained by the lap belt 50.
[0037]
That is, the operation of the force limiter of the retractor 14 absorbs and reduces the impact of the occupant on the upper body of the occupant from the shoulder belt 46, and the waist of the occupant is an intermediate portion of the double folded webbing 12 serving as a lap belt. Of the (lap belt 48 and the lap belt 50), at least one side (the lap belt 50) is securely restrained.
[0038]
Moreover, since the retractor 14 and the pretensioner 34 are separate bodies, the retractor 14 is smaller than a retractor provided with a pretensioner for drawing in the webbing 12. For this reason, it is easy to install the retractor 14 on the vehicle 16, and there is a degree of freedom in installing the pretensioner 34 on the vehicle 16.
[0039]
As described above, in the seatbelt device 10 having the above-described configuration, the shock received by the upper body of the occupant from the shoulder belt 46 is absorbed when the force limiter provided in the retractor 14 is operated, for example, when the vehicle 16 is rapidly decelerated. In addition, the lumbar portion of the occupant is securely restrained by the lap belt 50, so that the restraint of the occupant's body is improved, and the installation on the vehicle 16 is easy.
[0040]
In the above embodiment, the winding shaft 36 is configured to rotate in the direction of the arrow CCW (counterclockwise) in FIGS. 3 (A) and 4 (A). However, the present invention is not limited to this. For example, the seat belt device 100 may be configured as shown in FIG. Note that the same components and operations as those of the seat belt device 10 are denoted by the same reference numerals as those of the above-described embodiment, and description thereof is omitted.
[0041]
The seat belt device 100 has basically the same configuration as the seat belt device 10, but has an insertion hole 104 formed at the base end side (upper side in FIG. 5) of the tongue plate 102, and The middle part is inserted and wound. Further, a tip end portion 42 of the webbing 12 is wound around and locked at a portion between two locking holes 106 formed substantially at the center of the tongue plate 102. For this reason, the lap belt 50 is superimposed on the lap belt 48 in the seat belt device 10 (see FIG. 1), but in the seat belt device 100, the lap belt 50 (the leading end portion A lap belt 48 (an intermediate portion of the webbing 12 on the retractor 14 side wound around the tongue plate 22) is stacked on the upper side of the intermediate portion of the webbing 12 on the 42 side.
[0042]
In the seat belt device 100, when the winding shaft 36 is rotated in the direction of arrow CW (clockwise) in FIG. 5 by the pretensioner 34, the lap belt 50 is wound around the outside of the lap belt 48. Therefore, as shown in FIG. 5, even when the lap belt 48 is loosened, the sliding of the webbing 12 with respect to the winding shaft 36 is restricted by the tension acting on the lap belt 50.
[0043]
Further, in the above embodiment, the pretensioner 34 is fixedly arranged on the floor of the vehicle 16 near the lower end of the center pillar 18 and the winding shaft 36 is connected, but the present invention is not limited to this. For example, the pretensioner 34 and the take-up shaft 36 are arranged under the floor of the vehicle 16 near the lower end of the center pillar 18, and the intermediate portion of the webbing 12 inserted through a through hole formed in the floor of the vehicle 16 serves as the take-up shaft. 36 may be wound around.
[0044]
【The invention's effect】
As described above, according to the seatbelt device of the present invention, when the force limiter mounted on the retractor is operated, for example, in a vehicle sudden deceleration state, the impact received by the upper body of the occupant from the shoulder belt is absorbed. In addition, the lumbar portion of the occupant is strongly restrained by the lap belt, so that the restraint of the occupant's body is improved, and the occupant can be easily installed on the vehicle.
[Brief description of the drawings]
FIG. 1 is a front view showing an overall configuration of a seat belt device according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a configuration of a main part of the seat belt device according to the embodiment of the present invention.
FIG. 3A is a front view showing a state before and after an operation of a winding drive source, which is a constituent member of the seat belt device according to the embodiment of the present invention, and FIG. (B) is a front view showing a state in which the winding shaft of the winding drive source is rotated and the webbing is wound on the winding shaft, and (C) is a state in which the force limiter of the retractor operates to allow the retracting from the retractor. It is a front view showing the state where the webbing was pulled out.
FIG. 4A is a front view showing a state before and after an operation of a winding drive source, which is a constituent member of the seat belt device according to the embodiment of the present invention, and FIG. (B) is a front view showing a state in which the winding shaft of the winding drive source is rotated and the webbing is wound on the winding shaft, and (C) is a state in which the force limiter of the retractor operates to allow the retracting from the retractor. It is a front view showing the state where the webbing was pulled out.
FIG. 5 is a front view showing a configuration of a main part in another example of the seat belt device according to the embodiment of the present invention.
[Explanation of symbols]
Reference Signs List 10 seat belt device 12 webbing 14 retractor 16 having force limiter vehicle 22 tongue plate 28 seat 30 buckle 34 pretensioner (winding drive source)
36 Winding shaft 40 A pair of winding portions 100 Seat belt device 102 Tongue plate

Claims (1)

A tongue plate that engages with a buckle provided on the side of a vehicle seat;
A webbing having a base end wound around a retractor having a force limiter, an intermediate part slidably wound around the tongue plate, and a distal end locked to the tongue plate,
The buckle of the seat is provided on a side opposite to the buckle, and has a pair of winding portions arranged along a central axis, and a portion of the webbing wound around the tongue plate and the tip portion. An intermediate portion between which is slidably wound around one of the pair of winding portions,
The front end side of the webbing intermediate portion between the tongue plate and the winding shaft, which is connected to the winding shaft, and which is locked to the tongue plate when a predetermined acceleration due to sudden deceleration of the vehicle is detected. A winding drive source for rotating the winding shaft around the center axis in a direction in which the webbing intermediate portion is wound around the webbing intermediate portion on the retractor side wound around the tongue plate; ,
A seat belt device comprising:

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