JPH11129864A - Seat belt device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pre-tensioner mechanism respectively in a shoulder belt and waist belt part, quickly eliminate looseness in each belt part, quickly restraining an occupant at the same time, and by a shock energy damper device provided in one of the two pre-tensioner mechanisms, absorb collision energy of the occupant by belt tension, so as to protect the occupant from a hazard at collision time of a vehicle. SOLUTION: In a seat belt device for a vehicle of three-point type comprising a shoulder belt part 2 and a waist belt part 3, in the three-point type seat belt device for the vehicle fixing a through tongue 4 in a confluent point of the shoulder belt part 2 and the waist belt part 3 to a car body central part side through a buckle 8, fixing an end part of the waist belt part to a car body side part through an anchor member 6, and fixing to a belt part through a retractor 5 with pre-tensioner mechanism similarly to a car body side, one end part of the waist belt part is fixed to a car body through a pre-tensioner mechanism 9, and at least one of the two pre-tensioner mechanisms is provided with a shock energy absorbing means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat belt device, and more particularly to a vehicle seat belt device in which a slut at a junction of a shoulder belt portion and a waist belt portion is fixed to a center portion of a vehicle body via a buckle. A three-point vehicle seat belt device for fixing an end of a belt portion to a vehicle body side via an anchor member and further fixing the end to the vehicle body side via a retractor with a pretensioner mechanism to the shoulder belt portion. It is related to the improvement of.

[0002]

2. Description of the Related Art A three-point seat belt device having a retractor with a pretensioner mechanism at a tip end of a shoulder belt portion is conventionally known and widely used. Also, a pre-tensioner mechanism is provided at a buckle portion which engages through a slutung movably provided at one end of a waist belt portion which forms a boundary with a shoulder belt portion. A combination with an attached retractor has also been proposed.

In a three-point seat belt device of the above type having a retractor with a pretensioner mechanism only at the end portion of the shoulder belt, when an impact occurs on the vehicle body due to a collision, the occupant's body starts to move forward, but at the same time The tensioner mechanism is actuated to remove the tightness of the belt in the belt winding device, pull the upper body of the occupant backward, and press it against the seat back. At this time, the seat belt is not sufficiently retracted in the waist belt portion due to the folding resistance received in the slut portion, thereby delaying the start of the substantial restraining operation. The delay of the restraining operation start timing causes restraint in a state where the collision acceleration of the occupant is increased, that is, a state in which the collision energy is increased.In particular, when the collision speed is increased, particularly, the chest of the occupant due to the shoulder belt, particularly, Large loads are concentrated on the ribs, which may lead to a fracture.

In order to cope with such a situation, a pretensioner mechanism is provided at two places, a shoulder belt portion and a buckle portion of the waist belt, so that the shoulder belt portion is pulled in both directions, and simultaneously, the waist belt portion is drawn together. There has also been proposed a seat belt device capable of quickly eliminating the folding resistance and the slack of the seat belt itself and restraining the occupant quickly with a strong retraction force. However, one problem with such a device is that the occupant remains restrained, so that if the collision speed increases, the belt tension will continue to increase due to the continuation of the occupant collision energy described above, and the load will increase. Concentration also continues to increase, resulting in the above-mentioned situation unfavorable to the occupants.

[0005]

When the occupant receives an impact load, the seat belt device having the two pretensioner mechanisms causes the belt tension to increase after the operation of the pretensioner mechanism. No attempt has been made to reduce the overall or local load on the occupants. However, an object of the present invention is to provide a vehicle with an impact load and two pre-tensioner mechanisms provided on a shoulder belt portion and a waist belt portion to quickly apply a strong pulling force to the shoulder and waist belt portions after a collision, thereby causing an occupant to occupy the vehicle. A seat belt device that is designed to securely restrain and absorb the collision energy of the occupant when the belt load exceeds a specified value, buffer the load concentration acting on the occupant, and at the same time, control the behavior of the occupant. To provide.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention that one of the ends of the waist belt is fixed to a vehicle body via a pretensioner mechanism. This is achieved by providing at least one with impact energy buffering means.
Since the seat belt device according to the present invention has the above-described configuration, a quick and strong restraint state can be obtained by the operation of the two pretensioner mechanisms, and the impact energy buffering means is provided in at least one of the pretensioner mechanisms. As a result, it becomes possible to buffer the load concentration due to the increase in belt tension and to avoid excessive local compression on the occupant's chest or waist, and at the same time, to suppress behavior such as the occupant's excessive forward bending posture due to collision energy It is possible to do.

[0007]

According to one embodiment of the present invention, each of the two pretensioner mechanisms is activated with a predetermined time difference when an impact occurs. With such an actuation sequence, in the seat belt device according to the invention, rapid and excessive retraction due to the actuation of the two pretensioner mechanisms avoids, in particular, excessive compression of the occupant's chest by the shoulder belt part. In other words, while the pretensioner mechanism activated in advance eliminates the slack due to the folding resistance in the through ring portion or the sluting portion of one of the belt portions which occurs immediately after activation, the pretensioner activated later is activated. The activation of the mechanism with a time lag eliminates the slack in one belt part cooperatively, and at the same time, the slack in the other belt part is also quickly eliminated. Intense pressure on the occupant is avoided. By this operation sequence, a substantial delay in belt tension timing is prevented beforehand, and a substantially linearly increasing retraction load acts on the occupant from the initial operation of the preceding pretensioner. The body is restrained.

According to another embodiment of the seat belt device according to the present invention, a pretensioner mechanism and a retractor with an emergency lock device are attached to a tip end of a shoulder belt, and a joint between the shoulder belt portion and the waist belt portion is provided. A pretensioner mechanism is provided on a buckle portion that can be engaged with the provided slutung. Although such a configuration is also found in the above-described prior art, in such an embodiment, at least one of the pretensioner mechanisms is provided with impact energy buffering means. With this configuration, the simultaneous or staggered retraction of the two belt parts eliminates their slack quickly, restrains the occupant early, and at the same time, even when the collision speed is high, the action of the impact energy buffering means Accordingly, the occupant is prevented from being strongly pressed by the two belt portions, and a quick and safe occupant restraint state can be obtained.

In particular, in such a configuration, the shock energy buffering means operates in cooperation with the upper body portion of the occupant having a lower load-bearing capacity than the lumbar portion so that the large belt tension of the shoulder belt portion does not act, The behavior of the occupant is also controlled in a well-balanced state.

In order to further reduce the local load, the pretensioner mechanism of the buckle portion is provided with an impact energy buffering means for adjusting the buffering force balance of the other buffering means, and the two Having a time difference in the activation timing of the tensioner mechanism is particularly preferable in terms of controlling the cushioning behavior of the occupant when receiving an impact load, and absorbing energy not only at the occupant's chest but also at the lumbar region, thereby increasing the energy of the chest. The absorption burden ratio can be reduced, and the pressure on the entire occupant's body can be further safely and reliably avoided, and the impact can be cushioned in a more natural posture.

According to another embodiment, a pretensioner mechanism is provided along with an anchor portion forming the other end of the waist belt portion, and the outer end portion of the waist belt is provided at a lower portion on the vehicle body side. An arrangement is proposed which is adapted to be retracted towards the anchoring part to be fixed. In this way, when the other pretensioner mechanism pulls the wrap outer near the anchor portion forming the end of the waist belt portion, when the vehicle receives an impact load, both ends of the belt pass through sluting in directions opposite to each other. The problem of retraction resistance in the waist belt and the shoulder belt part is largely solved, and at the same time, the slack of the belt is eliminated at a stretch, and both belt parts receive a quick and even retraction force. Become. It enables extremely quick restraint of the occupant. Further, since at least one of the pretensioner mechanisms is provided with the impact energy buffering means, undesirable local compression is largely avoided even if the collision speed increases.

In addition, by providing shock energy buffering means to both the pretensioner mechanism connected to the end of the shoulder belt portion and the retractor with an emergency lock mechanism and the pretensioner mechanism at the anchor portion, the occupant can take advantage of the buffering action. The lumbar and thoracic regions of the subject are moderately balanced, providing a quick and slight average compression of cushioning and behavior control.

Further, according to one embodiment of the present invention, in a seat belt device including a pretensioner mechanism of a retractor with an emergency lock mechanism and another pretensioner mechanism, a pretensioner of the retractor with the emergency lock mechanism is provided. The tensioner mechanism is activated prior to the other pretensioner mechanism. According to such an operation sequence, the pretensioner mechanism of the retractor with the emergency lock mechanism that is activated earlier is capable of reducing the substantial tension timing required for eliminating the slack of one of the belt portions. Since the operation of the mechanism is compensated for with the slack of the other belt and a generally linearly rising belt tension is obtained from the early stage of the preceding pretensioner mechanism operation, the slack of both belt parts is quickly eliminated and quick and reliable. Occupant restraint is possible. In particular, when a retractor having an emergency lock mechanism is attached to the end of the shoulder belt portion, the occupant can be securely restrained by the action.

In particular, it is preferable that each of these pretensioner mechanisms is provided with impact energy buffering means whose buffering degree is adjusted. In such a configuration, the problem of local load concentration on the occupant's chest or the like is further reduced. As a result, the behavior of the occupant when receiving an impact load can be controlled to a natural state, that is, it is possible to receive an impact buffering action while maintaining a state close to a sitting posture.

Further, according to another embodiment, the pretensioner mechanism provided on the buckle section is activated before the pretensioner mechanism mounted on the shoulder belt section. With this operation sequence, the slack of the waist belt portion, which requires more force and time to be eliminated, is eliminated before the slack of the shoulder belt is eliminated, and a quicker and smoother occupant restraint becomes possible. Also in this case, the operation of the entire belt is quick and the restraint is well-balanced, and the effect of the occupant is the same as that of the above-described operation sequence.

According to another embodiment, the pretensioner mechanisms respectively provided on the shoulder belt portion and the waist belt portion each have an attached impact energy buffering means, and the shoulder belt portion has The buffering force of the provided shock energy buffering means is adjusted to a value larger than the buffering force of the shock energy buffering means provided in the buckle portion. Such an adjustment cushions excessive retraction loads above the occupant's chest while at the same time balancing the entire body in a forward and parallel movement from the seat in response to the weaker restraint of the lumbar retractor. Behavior can be achieved. Therefore, the overall behavior of the occupant when the seat belt is activated can be controlled in a well-balanced manner.

A similar effect is another embodiment according to the present invention, wherein the cushioning force of the shock energy buffering means provided on the shoulder belt portion is reduced by the shock energy buffering means provided on the anchor portion. It can also be obtained by adjusting it to a value greater than the force.

A preferred embodiment of a vehicle seat belt device according to the present invention will be described below with reference to the drawings.

[0019]

FIG. 1 is a perspective view showing a first embodiment of a vehicle seat belt device according to the present invention. In the vehicle, a retractor with an emergency lock device having a pretensioner mechanism is provided with a shoulder belt portion. And the pretensioner mechanism is attached to the buckle portion of the waist belt portion. FIG. 2 is a graph showing the change over time of the shoulder belt tension at the time of a collision of a vehicle equipped with a retractor with an emergency locking device provided with a pretensioner mechanism having an impact energy buffering means only in the shoulder belt portion. Is a graph similar to that of FIG. 2, wherein a retractor with an emergency locking device equipped with a pretensioner mechanism having shock energy buffering means is attached to the shoulder belt portion, while a pretensioner mechanism is attached to the buckle portion of the waist belt portion. 5 shows a temporal change in shoulder belt tension at the time of a collision of an attached vehicle.

The "EL" shown in FIG. 2 and FIG.
"R" means the above-mentioned "retractor with emergency lock device", "P / T" means the same "pretensioner mechanism", and "EA" means the same "impact energy buffer means". I have. Further, “EA” in FIG.
"1" and "EA2" mean "impact energy buffer means" attached to the shoulder belt portion and the waist belt portion, respectively.

FIG. 4 shows a retractor with an emergency locking device having an impact energy buffer and a pretensioner mechanism attached to a shoulder belt portion, and a pretensioner mechanism with an impact energy buffer device attached to an anchor portion of a waist belt portion. FIG. 5 is a schematic diagram illustrating a second embodiment of the vehicle seatbelt device, FIG. 5 is a block diagram illustrating an operation sequence when an impact load is generated by the two pretensioner mechanisms in FIG. 4, and FIG.
FIG. 5 is a schematic view of a pretensioner mechanism with impact energy buffering means for an anchor portion shown in FIG. 4.

FIG. 7 is an explanatory view showing an example of a buckle pretensioner mechanism with shock energy buffering means having a structure similar to the pretensioner mechanism attached to the buckle shown in FIG. FIG. 8 is a graph showing the change over time of the buffering force by two impact energy buffering means acting on the shoulder belt portion and the waist belt portion when an impact load occurs. FIG. 9 shows a modification of the second embodiment shown in FIG. 4, in which a pretensioner mechanism with shock energy buffer means similar to that provided on the shoulder portion of the anchor portion of the waist belt portion is provided. It is the schematic which attached the retractor with an emergency lock device which has a.

FIG. 1 shows a state in which the seatbelt device according to the present invention is applied to a driver's seat A disposed in front of a vehicle body B of an automobile. A floor plate on the side of the vehicle body to which the other end is attached to an elastic take-up reel incorporated in a retractor (ELR-P / T) 5 having a pretensioner mechanism having impact energy buffering means and to which the retractor 5 is attached. It includes a continuous substantially single webbing (belt) 1 attached to an anchor 6 pivotally mounted in the vicinity.

The webbing or belt 1 is divided into a shoulder belt portion 2 and a waist belt portion 3 by a slutung 4 movably penetrated into an intermediate portion thereof. In the book, body B
From the through anchor 7 pivotally mounted on the upper part of the center pillar C to the sluting 4 which is removably engaged diagonally downward across the seat A with the buckle part 8 located on the vehicle body center side. Defined by On the other hand, the "waist belt portion" is likewise defined by the length area which is folded back by the slut tongs 4 and traverses the seat A in the horizontal direction to the anchor portion 6 which is pivotally mounted near the floor on the side of the vehicle body. Defined.

Therefore, the webbing 1 is provided with the shoulder belt portion 2
Is fixed to the vehicle body side via the retractor 5, the other end is similarly fixed to the vehicle body side via the anchor 6, and the confluence is connected to the sluting 4.
This forms the main constituent element of the three-point vehicle seat belt device fixed to the vehicle body center portion side via the buckle portion 8. However, in the present invention, the slutung 4 is not necessarily intended to be of a type that can be moved on one webbing, but is an immovable one that joins separate shoulder belt portions and waist belt portions together. Forms are also included.

As a characteristic configuration of the seat belt device according to the present invention, a buckle portion 8 with which a slutung 4 for holding one end of the waist belt portion 3 movably engages.
However, it is fixed to the vehicle body center side via a pretensioner mechanism 9. This pretensioner mechanism (P
/ T) is preferably an impact energy damping means (EA)
And its operation is similar to that of the retractor (ELR-P / T) 5 with the pretensioner mechanism and the emergency lock mechanism provided with the above-described impact energy buffering means (EA). One specific configuration of the buckle pretensioner mechanism 9 is illustrated in FIG. In this configuration, the shock energy buffering means (E
A) is provided on the buckle support member.

As another characteristic structure of the seat belt device according to the present invention, a pretensioner mechanism 60 as shown in FIG. 6 is provided instead of the buckle pretensioner mechanism 9 as shown in FIG. Have. The pretensioner mechanism 60 also preferably includes impact energy buffering means (EA). The operation and effects of the pretensioner mechanism for the anchor portion described below are substantially the same as those of the pretensioner mechanism 9 for the buckle portion, and the pretensioner mechanism having the impact energy buffering means (EA) as described above. The shoulder belt 2
The provision of the belt on at least one belt portion of the waist belt 3 has an effect of reducing local excessive load on the chest and abdomen of the occupant during the shock absorbing process. When both pretensioner mechanisms are provided with shock energy buffering means, by appropriately adjusting their buffering force, the occupant's posture can be controlled to a reasonable and safe form under a large shock load. It means that it is possible.

Next, a pretensioner mechanism (P / T) and an impact energy buffering means (E) are provided at the end of the shoulder belt portion.
A) Retractor with emergency locking mechanism (ELR)
FIG. 2 is a graph showing the change over time of the tension applied to the shoulder belt portion in the normal seat belt device with only the seat belt 5 attached, and FIG. 3 is a graph showing the change over time of the tension applied to the shoulder belt portion of the seat belt device. This will be described below with reference to a block diagram showing a correlation operation sequence of the two pretensioner mechanisms shown in FIG. 5 while comparing with a graph.

In FIG. 5, the stage where the front part of the vehicle collides with some object first, and the acceleration sensor detects and outputs an electric signal indicating the deceleration due to the collision is a block a. The step of evaluating the sent deceleration signal to determine if there is a collision is block b, and the explosive fuze incorporated in the pretensioner mechanism in a general configuration is immediately energized. As a result, the explosive explodes in the container and activates the starting cylinder,
Blocks c and d represent the stage at which the pretensioner mechanism is activated. However, the block d is provided with a delay unit for starting slightly later than the start timing of the block c. Therefore, the two pretensioner mechanisms are not activated at the same time, and the start of the retracting operation of the shoulder belt portion and the waist belt portion corresponding to these pretensioner mechanisms causes a slight but temporal shift.

Therefore, in the case of a normal seat belt device having only one pretensioner mechanism, the pretensioner mechanism is activated only by the operation of the block c, and as a result, the shoulder belt portion is immediately wound around the spool of the retractor. However, when the pretensioner mechanism is activated, a large amount of energy is generated due to the explosion, so that the retraction of the shoulder belt portion is started at a stretch, and the tension peak of the shoulder belt portion in that state is indicated by an arrow symbol X in FIG. . Thereafter, an attempt is made to eliminate the belt pull-in resistance at the through ring portion attached to the slut of the waist belt, and once the tension is reduced, the state becomes the low tension state indicated by arrow Y. The belt cannot be pulled out at that time. However, since the collision energy of the occupant is maintained, the upper body tries to move forward with respect to the belt which cannot be pulled out, and as a result, the occupant's upper body receives strong belt tension. Thereafter, the belt tension rises to the peak of the curve shown by the broken line until it reaches a predetermined limit.

However, the restraint state corresponding to the tension rise along the broken line is such that the occupant's body sometimes cannot endure, and when a certain point Z of the belt tension that does not harm the body is reached, Impact energy buffering means (E
The operation of A) is started. Thereafter, the tension is kept constant due to the continuation of the cushioning action of the shoulder belt portion, and the belt tension rapidly decreases as the occupant's behavior approaches a stopped state.

Therefore, as shown in FIG. 3, in the seat belt device according to the present invention, the buckle portion 8 is moved at a point indicated by an arrow symbol B, which is a timing at which a shift from the arrow symbol X to Y in FIG. Pretensioner mechanism (P / T) 9
As a result, the shoulder belt is pulled at a stretch diagonally downward in the opposite direction along with the slutung 4, so that the slack of not only the shoulder belt portion 2 but also the waist belt portion 3 is instantaneously eliminated. Thereafter, the retraction movement of both pretensioner mechanisms is stopped and the emergency locking device of the retractor is activated, but the upper body of the occupant still retains the energy to move forward, so that the belt tension is continuously increased and the shoulder is increased. When the tension applied to the belt portion reaches a set point (corresponding to the arrow symbol Z in FIG. 2) indicated by the arrow symbol C, the shock energy buffering means (EA) provided on the shoulder belt portion 2 operates. To cushion the impact energy of the occupant.
In the meantime, since the start of the pretensioner mechanism 9 of the buckle portion 8 which is started earlier with a slight delay, a large decrease in tension corresponding to Y in FIG. 2 is avoided, so that the belt tension is substantially smoothly linear. And reaches the specified point C. Therefore, the amount of energy absorbed by the belt tension (the impulse of the tension and the time) is increased by the absence of the drop in the tension, and the energy held by the occupant can be absorbed early.

As shown in FIG. 8, the shock energy damping means (EA), which is one of the features of the vehicle seatbelt device according to the present invention, has a lower cushioning force than the shoulder belt portion (EA1). The belt portion (EA2) is set lower. Therefore, the behavior of the occupant ends when the driver leans forward slightly. Accordingly, a proper starting timing of the retraction force of both belt portions and a proper balance of the buffering force are maintained, so that the shock action of not only the shoulder belt but also the waist belt at the time of the impact is performed quickly and smoothly, and the occupant (wearer) ), The belt pulling load applied to the chest and waist is not excessively increased, and a secondary injury is also prevented. This means that the occupant's posture during the buffering is also controlled to a natural state without any difficulty, so that the safety of the occupant is further ensured.

FIG. 6 illustrates one preferred configuration of the above-described pretensioner mechanism (P / T) with impact energy buffering means (EA) for the anchor portion.
The pretensioner mechanism 60 constitutes an anchor portion indicated by reference numeral 6 for firmly fixing the tip end of the wrap outer of the waist belt portion 3 to the lower portion on the outer side of the vehicle body in FIG. 4, and is attached to the buckle portion 8 described above. Since the operation and effect are the same as those of the pretensioner mechanism 9 that is used, it can be used instead. In that case, the anchor tongue 10a must be replaced by a buckle 8.

The pretensioner mechanism 60 with shock energy buffering means has an elongated corrugated plate-like anchor plate 10 as an anchor member, and a slide coupled at its rear end by bolts 11 on the extension of the anchor plate so as to be relatively movable. And a member 13. The bolt 11 is inserted into an elongated guide groove 14 pierced along the direction of extension of the slide member 13, and at the same time, the anchor plate 10 extends in the groove along the direction of extension.
And can slide with it. Further, the slide member 13
An anchor bolt 12 pivotally attached to a lower portion of the outer side of the vehicle body is pivotally attached to an end of the vehicle body. Therefore, the pretensioner mechanism 60 is firmly pivotally fixed to the vehicle body by the anchor bolt 12. Will be done.

The anchor bolt 12 rotatably supports a pulley 19 together with the slide member 13, and a wire 18 whose tip is anchored to the anchor plate 10 by a locking bolt 11 so as to be adjustable in length is wound around the pulley 19. The pretensioner mechanism starting means 61
Are locked to a piston 16 slidably disposed in a cylinder 15 constituting the above. One airtight chamber of the cylinder 15 defined by the piston 16 is in communication with an explosion means 17 which responds to the collision detection means, and in order to activate the pretensioner mechanism 60, the explosion means 17 is exploded. The wire 18 is pulled in at a stretch by retracting the wire 16, and the anchor plate 10 is retracted with respect to the slide member 13. With this momentary action,
The locking bolt 11 entrains the anchor plate 10 in the guide groove 14 to the rear end thereof, thereby pretensioning the belt portion.
That is, the retraction tension stroke is completed, the slack of the belt is removed, and the occupant is firmly restrained by the seat backrest.

The anchor plate 10 in which corrugations parallel to each other in the transverse direction are corrugated along the length direction is integrally formed with a wide anchor tongue 10a at the front end. A belt guide groove is formed in the distal end portion of the anchor tongue 10a in the lateral direction, and the winding end portion 3b of the waist belt portion 3 is inserted therethrough. It is sewn firmly to the waist belt portion in such a way that it returns on the waist belt portion via the town 3a.

When the occupant moves forward due to impact energy, the belt 10 receives excessive tension in the opposite direction when the occupant moves forward due to the impact energy, and the chest plate fractures or abdominal rupture occurs. In order to avoid such secondary injuries, when a load is applied, the waveform is extended, that is, a cushioning means against impact energy is formed by utilizing plastic deformation stress. In addition, since the buffering force is determined by the height of the uneven wave, the material and the length in the extension direction, when designing, the balance of the buffering force of both impact energy buffering means (EA) and the retractor with a pretensioner mechanism are required. (ELR-P / T)
The balance with 5 must of course be considered.

While the pretensioner mechanism with shock energy buffering means for the anchor portion or the buckle portion shown in FIG. 6 has been described above, a different example shown in FIG. A pretensioner mechanism for a buckle part having a shock energy buffering means having a configuration will be described.

The pretensioner mechanism shown in FIG. 7 makes it possible to increase the sensitivity of the acceleration detecting means by facilitating the reset operation once the operation has been performed, so that the pretensioner mechanism is effective under various operating conditions. It is. The guide rail 1 fixed to the vehicle body with the pullback prevention mechanism 109a
20 and the right and left sliding ranges are the stopper portions 121 and 12.
2 and a bearing hole 104 formed in the slide base 101 so that the cam portion 102 slidably contacts the guide rail 120. Pin 10
3 and rotatably held by the transmission member 123.
And a support member 107 having a buckle 108 fixed to the cam piece.

Further, the cam portion 102 is
1. The cable-like body 124 wound around the rotating drum of the driving means 109b having the rotating drum 132 rotated by
Is pulled in the webbing tensioning direction by the transmission member 123 inserted therein, the cam piece 1 on the guide rail
05 is allowed to slide, and when the retracted portion is pulled back by the webbing, it operates so as to mesh with the surface of the guide rail 120 to prevent sliding.

The buckle support member 107 is made of a non-rigid plate having a corrugated vertical cross-section like the anchor plate 10 shown in FIG. 6, and forms the shock energy buffering means 100 itself. ing. Therefore, when a certain amount of impact load is applied to the waist belt 3, the pretensioner mechanism is activated at the same time as the operation is completed, and the abdomen of the occupant is protected from unnecessary compression.

Finally, the seat belt device shown in FIG. 9 will be described. This device shows a modification of the second embodiment shown in FIG. In the embodiment of FIG. 4, a pretensioner mechanism (P / T) with an impact energy buffer (EA) shown in detail in FIG. 6 is used,
In this modification, the same shock energy buffering means (E) as the one (5a) connected to the end of the shoulder belt portion 2 is used.
A) An emergency lock device-equipped retractor (ELR) 5b having a pretensioner mechanism (P / T) is attached. With this configuration, the pretensioner mechanism and the retractors 5a and 5b with the emergency lock device, both simultaneously or with a time lag, can more quickly and reliably restrain not only the occupant's upper body but also the waist. Further, since each of the pretensioner mechanisms is provided with the impact energy buffering means, the behavior of the occupant subjected to the impact load can be changed in a similar manner to the example shown in FIG. It becomes possible to control to a natural state.

[0044]

According to the vehicle seat belt device of the present invention, the slutung at the confluence of the shoulder belt portion and the waist belt portion is fixed to the center of the vehicle body via the buckle, and the end of the waist belt portion is anchored. In a three-point vehicle seat belt device, which is fixed to the vehicle body side via a member and is also fixed to the vehicle body side via a retractor with a pretensioner mechanism to the shoulder belt portion, Either one end is fixed to the vehicle body via a pretensioner mechanism, and at least one of the two pretensioner mechanisms has a structure provided with shock energy buffering means, so that the shoulder belt portion and The quick and strong retraction force of the pretensioner mechanism, which pulls in both directions with the waist belt, quickly eliminates slack in the belt, and When the belt tension reaches the specified point, the shock energy buffering means is activated to quickly cushion the belt, thereby preventing excessive belt tension from being applied to the occupant's chest and abdomen. ,
This has the effect of further securing the safety of the occupants.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a vehicle seatbelt device according to the present invention.

FIG. 2 is a graph showing a change over time of a shoulder belt tension at the time of a collision of a vehicle having a retractor with an emergency locking device provided with an impact energy buffer and a pretensioner mechanism only in a shoulder belt portion.

FIG. 3 shows a retractor having an emergency locking device equipped with an impact energy absorbing means and a pretensioner mechanism attached to a shoulder belt portion, and a vehicle in which a pretensioner mechanism is attached to a buckle portion of a waist belt portion during a collision. FIG. 3 is a graph similar to FIG. 2 showing a change with time of a shoulder belt tension.

FIG. 4 is a second view of a vehicle seat belt device according to the present invention in which a retractor with an emergency locking device having a pretensioner mechanism with shock energy buffering means is attached to a shoulder belt portion, and a pretensioner mechanism is attached to an anchor portion of a waist belt portion. FIG. 1 is a schematic diagram showing an embodiment.

FIG. 5 is a block diagram showing an operation sequence of the two pretensioner mechanisms in FIG. 4 when an impact load occurs.

FIG. 6 is a schematic view of a pretensioner mechanism with an impact energy damping means for an anchor portion shown in FIG. 4;

FIG. 7 is an explanatory view showing an example of a buckle pretensioner mechanism with impact energy buffering means having a structure similar to the pretensioner mechanism attached to the buckle shown in FIG.

FIG. 8 is a graph showing a change over time of a buffering force of two impact energy buffering means acting on a shoulder belt portion and a waist belt portion when an impact load occurs.

9 shows a modification of the second embodiment shown in FIG. 4, and shows a pretensioner mechanism with shock energy buffering means similar to that provided on the shoulder portion of the anchor portion of the waist belt portion. It is the schematic which attached the retractor with an emergency lock device which has a.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Webbing 2 Shoulder belt part 3 Waist belt part 4 Slut tong 5 Retractor with pretensioner mechanism (ELR-P
/ T) 6 Anchor part 7 Through anchor 8 Buckle part 9 Pretensioner mechanism (P / T) A Seat seat B Body C Center pillar

Claims (1)

[Claims] 1. A slutung at a confluence of a shoulder belt portion and a waist belt portion is fixed to a center portion of a vehicle body via a buckle, and an end of the waist belt portion is fixed to a vehicle body side portion via an anchor member. Further, in the three-point type vehicle seat belt device, which is also fixed to the side of the vehicle body via the retractor with a pretensioner mechanism on the shoulder belt portion, one of the waist belt portions has a pretensioner mechanism. A seat belt device for a vehicle, wherein at least one of the two pretensioner mechanisms is provided with impact energy buffering means.