JPH1120613A - Seat belt device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely suppress the slippage and rise of a lap belt to an occupant's belly part while maintaining the same ease of mounting as that of an ordinary three-point type seat belt. SOLUTION: Since the relative length of a shoulder belt for a lap belt at the time of vehicle collision increases more than that before collision, a forward travel amount B of an occupant's upper part of the body tends to increase more when compared with a forward travel amount of an occupant's waist. Consequently, the forward travel amount of the occupant's waist is suppressed, and the forward travel amount B of the occupant's upper part of the body is promoted at the same time. As a result, a waist part rotation amount C which promotes the slippage and rise phenomenon of the lap belt to an occupant's belly part is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seatbelt device, and more particularly to a vehicle seatbelt device for suppressing a lap belt from rising toward an abdomen.

[0002]

2. Description of the Related Art In a seat belt apparatus having a lap belt for restraining the occupant in the vicinity of the abdomen and a shoulder belt for restraining the occupant in the vicinity of the chest in an oblique state, a conventional occupant has been proposed in order to suppress the lap belt from rising relative to the abdomen. Leg belts for restraining the thighs (see Japanese Unexamined Patent Application Publication No.
09152).

[0003]

However, in such a conventional technique, the wearing of the seat belt may be troublesome for some people as compared with a general three-point seat belt, or the thigh may be constantly worn. It is conceivable that there is discomfort due to being restrained.

The present invention has been made by paying attention to such a conventional technique, and the lap belt is shifted upward to the abdomen while having the same ease of wearing as a general three-point seat belt. An object of the present invention is to provide a vehicle seatbelt device that can be reliably suppressed.

[0005]

According to the first aspect of the present invention,
A seat belt is formed by attaching a shoulder belt and a lap belt to each tongue, and at least one of both ends of the seat belt is wound around a vehicle body or a retractor provided on a seat, and the tongue is attached to the vehicle body or In a vehicle seat belt device for engaging a buckle provided on a seat and restraining an occupant on the seat, a means for increasing a relative length of the shoulder belt to the lap belt is provided, and the shoulder belt with respect to the lap belt during a vehicle collision is provided. The relative length is greater than before the collision. Here, the shoulder belt and the lap belt may be separate, integral, or either.

According to the first aspect of the present invention, the relative length of the shoulder belt to the lap belt at the time of a vehicle collision is greater than before the collision, so that the amount of forward movement of the occupant upper body is smaller than that of the occupant waist forward. It tends to increase. This allows
The amount of forward movement of the occupant at the waist is suppressed, and at the same time, the amount of forward movement of the occupant's upper body is promoted. Therefore, it is possible to avoid a situation in which the wearing of the seat belt is troublesome and a feeling of discomfort because the thigh is constantly restrained as in the related art.

According to a second aspect of the present invention, the shoulder belt has a higher elongation than the lap belt.

According to the second aspect of the present invention, since the shoulder belt has a high elongation and the lap belt has a low elongation, the occupant's waist forward movement is suppressed. It tends to increase compared to the amount of forward movement. Therefore, it is possible to prevent the lap belt from rising toward the abdomen.

According to the third aspect of the present invention, the shoulder belt and the lap belt of the seat belt are respectively wound by the retractors, and the direct clamp is set only on the retractor on the lap belt side. Direct clamp is not set.

According to the third aspect of the present invention, since the direct clamp is set on the retractor on the lap belt side, the lap belt is not easily stretched, but the direct clamp is not set on the retractor on the shoulder belt side. , Shoulder belt is easy to stretch. Therefore, it is possible to prevent the lap belt from rising toward the abdomen.

According to a fourth aspect of the present invention, the shoulder belt and the lap belt of the seat belt are each wound by a retractor, a pretensioner is provided only on the retractor on the lap belt side, and the retractor on the shoulder belt side is provided on the retractor. Pretensioner is not set.

According to the fourth aspect of the present invention, since the pretensioner is set on the retractor on the lap belt side, the lap belt is hardly stretched, but the pretensioner is not set on the retractor on the shoulder belt side. , Shoulder belt is easy to stretch. Therefore, it is possible to prevent the lap belt from rising toward the abdomen.

According to a fifth aspect of the present invention, the shoulder belt and the lap belt of the seat belt are each wound by a retractor, a load limiter is set only on the shoulder belt side retractor, and the lap belt side retractor is provided with a load limiter. Load limiter is not set.

According to the fifth aspect of the present invention, since the load limiter is set in the retractor on the shoulder belt side, the shoulder belt is easily stretched, but the lap belt without the load limiter is not easily stretched in the retractor. Therefore, it is possible to prevent the lap belt from rising toward the abdomen.

According to a sixth aspect of the present invention, a seat belt is formed by attaching corresponding ends of a shoulder belt and a lap belt to respective tongues, and at least one of both ends of the seat belt is provided on a vehicle body or a seat. In a vehicle seatbelt device in which a tongue is engaged with a buckle provided on a vehicle body or a seat to restrain an occupant in the seat, the position of the seatbelt is forcibly set to a predetermined position. An adjusting means is provided for forcibly adjusting the position of at least one of the shoulder belt and the lap belt at the time of a vehicle collision to a predetermined position.

According to the present invention, the occupant can be properly restrained by forcibly adjusting the position of the seat belt to the predetermined position.

According to a seventh aspect of the present invention, the shoulder belt and the lap belt of the seat belt are respectively wound by a retractor, and an occupant condition sensor for detecting an occupant condition of an occupant wearing the seat belt is provided. A direct clamp is set on both the lap belt side and the shoulder belt side retractors, and a control device for controlling the operation / non-operation of each direct clamp based on the occupant condition information detected by the occupant condition sensor is set. In the event of a vehicle collision, when the occupant condition detected by the occupant condition sensor satisfies a certain condition, the direct clamp of both retractors is activated, and when the occupant condition does not satisfy the condition, the direct clamp of the retractor on the lap belt side is activated. Only the die of the shoulder belt side retractor. The transfected clamp is inoperative.

According to the seventh aspect of the present invention, the degree of the occupant's upper body backward tilt, which is one of the factors that determine the degree of the initial waist rotation, is determined based on the occupant conditions. By selecting the non-operation and forcibly adjusting the position of the seat belt to a predetermined position, it is possible to appropriately restrain the occupant.

According to an eighth aspect of the present invention, the shoulder belt and the lap belt of the seat belt are each wound by a retractor, and an occupant condition sensor for detecting an occupant condition of an occupant wearing the seat belt is provided. A pretensioner is set on both the lap belt side and the shoulder belt side retractors, and a control device that controls the operation / non-operation of each pretensioner based on the occupant condition information detected by the occupant condition sensor is set. In the event of a vehicle collision, when the occupant condition detected by the occupant condition sensor satisfies a certain condition, the pretensioners of both retractors are operated, and when the occupant condition does not satisfy the condition, the pretensioner of the lap belt side retractor is operated. Only to operate the pretensioner of the shoulder belt side retractor. To.

According to the eighth aspect of the present invention, the degree of inclination of the occupant upper body, which is one of the factors that determine the degree of the initial rotation of the waist, is determined based on the occupant conditions. By selecting the non-operation and forcibly adjusting the position of the seat belt to a predetermined position, it is possible to appropriately restrain the occupant.

According to a ninth aspect of the present invention, the shoulder belt and the lap belt of the seat belt are each wound by a retractor, and an occupant condition sensor for detecting an occupant condition of an occupant wearing the seat belt is provided. A load limiter is set for both the lap belt side and the shoulder belt side retractors, and a control device for controlling the operation / non-operation of each load limiter based on the occupant condition information detected by the occupant condition sensor is set. In a vehicle collision, when the occupant condition detected by the occupant condition sensor satisfies a certain condition, the load limiters of both retractors are deactivated, and when the occupant condition does not satisfy the condition, the load of the shoulder belt side retractor is reduced. Activate only the limiter and turn off the load limiter of the lap belt side retractor. And dynamic.

According to the ninth aspect of the present invention, the degree of occupant upper body backward tilt, which is one of the factors that determine the degree of the initial waist rotation, is determined based on the occupant conditions. By selecting the non-operation and forcibly adjusting the position of the seat belt to a predetermined position, it is possible to appropriately restrain the occupant.

According to a tenth aspect of the present invention, a seatback angle sensor is used as an occupant condition sensor, and the seatback angle detected by the seatback angle sensor is defined as an occupant condition, and the seatback angle is equal to or less than a certain value. It is determined whether or not the occupant condition satisfies a certain condition based on whether or not the condition is satisfied.

According to the tenth aspect of the present invention, by using a seatback angle sensor as the occupant condition sensor, it is determined whether or not the occupant is in a rearwardly seated posture, and the occupant is further appropriately restrained. be able to.

According to an eleventh aspect of the present invention, an occupant mass sensor is used as an occupant condition sensor, and the occupant weight detected by the occupant mass sensor is used as an occupant condition. It is determined whether the occupant condition is within a certain range.

According to the eleventh aspect of the present invention, by using the occupant mass sensor as the occupant condition sensor, the occupant's physique can be determined and the occupant can be more appropriately restrained.

[0027]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 to FIG. 10 are views showing a first embodiment of the present invention. Seat belt 1 is shoulder belt 2
, A lap belt 3 and a tongue 4. The corresponding ends of the shoulder belt 2 and the lap belt 3 have a structure attached to the tongue 4, respectively, and have a general structure in which the tongue insertion hole is movably passed through one continuous seat belt. Are different.

The shoulder belt 2 and the lap belt 3
The retractors 5 and 6 respectively wind up the retractors. By engaging the tongue 4 of the seat belt 1 with the buckle 8 fixed to the seat 7, an occupant sitting on the seat 7 can be restrained.

In the first embodiment, as means for increasing the relative length of the shoulder belt 2 with respect to the lap belt 3, the degree of elongation between the shoulder belt 2 and the lap belt 3 is made different. That is, the elongation of the shoulder belt 2 is higher than the elongation of the lap belt 3 (the shoulder belt 2 is softer and easier to expand than the lap belt 3).

More specifically, as shown in FIG. 5, the high elongation belt used for the shoulder belt 2 is a belt having a belt elongation of 15% when the belt tension is 1130 (kgf), a lap belt 3 The belt having a low degree of belt elongation used in Example 1 has a belt elongation of 5% when the belt tension is 1130 (kgf).

Next, the operation of the first embodiment will be described. First, the general behavior of the occupant during a vehicle collision will be described with reference to FIGS. In other words, in order to prevent the lap belt 3 from shifting to the abdomen, it is necessary to suppress the waist rotation amount C that promotes the shifting phenomenon.
In order to suppress the waist rotation amount C, the occupant waist forward movement amount A shown in FIG. 9 is suppressed and the occupant upper body forward movement amount B shown in FIG. 10 is promoted. Although it is effective to avoid the collision), conventionally, only the restraint of the occupant's waist forward movement A is suppressed and the increase of the occupant's body forward movement B is suppressed. Was.

In the first embodiment, when the occupant wearing the seat belt 1 moves due to inertial force (see FIG. 6) in a vehicle frontal collision or the like, the shoulder belt 2 has a high elongation (for example, 15%). Since the lap belt 3 has a low elongation (for example, 5%), the occupant's waist forward movement amount A is suppressed,
The occupant upper body forward movement amount B tends to increase compared to the occupant waist forward movement amount A. As a result, the occupant waist forward movement amount A is suppressed, and at the same time, the occupant upper body forward movement amount B is promoted. As a result, the waist rotation amount C that promotes the phenomenon that the lap belt 3 shifts to the abdomen is suppressed. become.

This is because the thigh is restrained, that is, as compared with the conventional example in which the occupant's waist forward movement A is merely suppressed, the lumbar rotation amount C is increased by the amount that the occupant's body forward movement B is promoted. Can be effectively suppressed, and as a result, the possibility of preventing the lap belt 3 from shifting to the abdomen increases. At the same time, it can be avoided that the wearing of the seat belt 1 is troublesome and that the thighs are constantly restrained, which causes discomfort, as in the related art.

The shoulder belt 2 and the lap belt 3
As compared with a general three-point seat belt having the same belt elongation, it is possible to effectively suppress the occupant waist forward movement amount A and promote the occupant upper body forward movement amount B. The difference from the occupant forward movement phenomenon in a general three-point seat belt having a low belt elongation (for example, 5%) is as shown in FIG. 7, and the occupant waist forward movement amount A is suppressed almost equally. However, the promotion of the occupant upper body forward movement amount B is intended in the present embodiment,
As a result, the waist rotation amount C can be effectively suppressed, and as a result, the possibility that the lap belt 3 can be prevented from rising to the abdomen can be suppressed.

Further, the belt elongation is high (for example, 15
%) The difference from the occupant forward movement phenomenon in a general three-point seat belt is as shown in FIG. 8. The occupant upper body forward movement amount B is promoted almost equally, but the occupant waist forward movement is promoted. The amount A is suppressed in the present embodiment, and
The waist rotation amount C can be effectively suppressed, and as a result, the possibility that the lap belt 3 can be prevented from shifting to the abdomen can be suppressed.

FIGS. 11 to 13 are views showing a second embodiment of the present invention. In the second embodiment, the elongation of both the shoulder belt 2 and the lap belt 3 is low, and the direct clamp 10 is set only on the retractor 9 (see FIG. 11) on the lap belt 3 side. The retractor 11 (see FIG. 12) has a configuration in which the direct clamp 10 is not set.

The direct clamp 10 is as shown in FIG. 11, and is used when an occupant wearing a seat belt moves forward due to inertial force at the time of a frontal collision of a vehicle or the like.
When the lap belt 3 is about to be pulled out from the retractor 9, the direct clamp 10 directly sandwiches the lap belt 3, thereby preventing the lap belt 3 from being pulled out.

When the direct clamp 10 is not set, the shaft 12 of the retractor 11 locks to prevent the shoulder belt 2 from being pulled out. However, since the shoulder belt 2 is actually wound around the shaft 12 slowly, Even after the shaft 12 is locked, the shoulder belt 2 is pulled out to a certain extent (winding phenomenon). Therefore, the relative length of the shoulder belt 2 with respect to the lap belt 3 increases by the amount pulled out by the winding tightening.

The influence of the direct clamp 10 on the belt pull-out characteristic is as shown in FIG. 13. When the belt tension F (belt pull-out force) is Fa, the belt pull-out amount S is S1 when the direct clamp 10 is provided. However, without the direct clamp 10, the belt withdrawal amount S increases to S2.

Therefore, in the second embodiment, since the direct clamp 10 is set on the retractor 9 on the lap belt 3 side, the lap belt 3 is hardly stretched, but the direct clamp 10 is mounted on the retractor 11 on the shoulder belt 2 side. Is not set, the shoulder belt 2 is easily stretched. Therefore, similarly to the first embodiment, it is possible to prevent the lap belt 3 from rising toward the abdomen.

FIGS. 14 and 15 show a third embodiment of the present invention. In the third embodiment, both the shoulder belt and the lap belt 3 have low elongation, and only the retractor 13 on the lap belt 3 side has the pretensioner 1.
4 is set, and the pretensioner 14 is not set on the shoulder belt side retractor (not shown).

The pretensioner 14 is as shown in FIG. 14, and the occupant wearing the seat belt starts moving forward due to inertia force at the time of a frontal collision of the vehicle.
This device removes slack of the lap belt 3 by rotating the shaft 15 of the retractor 13 and winding the lap belt 3. If the pretensioner 14 is not set, the belt tension rise at the time of pulling out the belt is delayed by the amount of the belt deflection, and as a result, the occupant moves forward more.

The effect of the pretensioner 14 on the belt pull-out characteristic is as shown in FIG. 15, and when the belt tension F (belt pull-out force) is Fa, the pretensioner 1
4, the belt withdrawal amount S is S <b> 1, but without the pretensioner 14, the belt withdrawal amount S increases to S <b> 2.

Therefore, in the third embodiment, since the pretensioner 14 is set on the retractor 13 on the lap belt 3 side, the lap belt 3 is hardly stretched, but the pretensioner 14 is set on the retractor on the shoulder belt side. Because it is not done, the shoulder belt is easy to stretch. Therefore, similarly to the previous embodiment, it is possible to prevent the lap belt 3 from shifting to the abdomen.

FIG. 16 is a diagram showing a fourth embodiment of the present invention. In the fourth embodiment, both the shoulder belt and the lap belt have low elongation, and a load limiter (not shown) is set only on the shoulder belt-side retractor, and the load limiter is provided on the lap belt-side retractor. The configuration has not been set.

The load limiter means that the occupant wearing the seat belt pulls the belt while moving forward due to inertia at the time of a frontal collision of the vehicle, and the belt tension rises and reaches a certain value. This is a device that prevents the belt tension from rising above that value by allowing the belt to rotate and allowing the belt to rotate (the amount by which the belt is extended is determined by various design requirements and is not infinite).

When the load limiter is set, the belt is pulled out when the belt tension reaches a certain value.
Increase. The effect of the load limiter on the belt pull-out characteristic is, for example, as shown in FIG. 16. When the belt tension F (belt pull-out force) is Fa, the belt pull-out amount S is S1 without the load limiter, but the load limiter is not used. In the presence, the belt withdrawal amount S increases to S2.

Therefore, in the fourth embodiment, since the load limiter is set on the retractor on the shoulder belt side, the shoulder belt is easily extended, but the lap belt without the load limiter is not easily extended on the retractor. Therefore, similarly to the previous embodiment, it is possible to suppress the lap belt from shifting to the abdomen.

FIGS. 17 to 23 show a fifth embodiment of the present invention. In the fifth embodiment, both the shoulder belt 2 and the lap belt 3 in the seat belt 1 have low elongation, and the shoulder belt 2 and the lap belt 3
Direct clamps 18, 19 are provided on both retractors 16, 17, respectively. The seat 20 is provided with a seat back angle sensor 21 as an “occupant condition sensor”.
A control device 22 for determining the operation / non-operation of (set on the retractor 16 on the shoulder belt 2 side) is set.

Here, in the event of a frontal collision of the vehicle, the direct clamp 19 (the retractor 17 on the lap belt 3 side) is used.
Is always activated, but the direct clamp 18
With respect to (set on the retractor 16 on the shoulder belt 2 side), the direct clamp 18 is activated when the seatback angle θ is equal to or less than the set value θ0 according to the determination of the control device 22 which has received the signal from the seatback angle sensor 21. When the seatback angle θ exceeds the set value θ0, the direct clamp 18 is deactivated.

When the seat back angle θ is equal to or smaller than the set value θ0, as shown in FIG. 20, for example, in the event of a frontal collision, the occupant wearing the seat belt 1 is determined to be in a normal sitting posture and the direct clamp is performed. The occupant is immediately started to be actuated together with the operation of the direct clamp 18. Also, as shown in FIG. 21, when the seat back angle θ exceeds the set value θ0, the seat belt 1
The direct clamp 18 is deactivated by determining that the occupant wearing the vehicle is in the rearwardly inclined sitting posture, and the direct clamp 1
Activate only 9

When the seat back angle θ is equal to or less than the value θ0 (FIG. 20), the occupant is in the normal sitting posture, the waist rotation amount C is small (FIG. 22), and the lap belt 3 shifts up to the waist. It is considered that the occupant is unlikely to occur, and priority is given to starting the occupant restraint earlier, and the direct clamp 18 is operated together with the operation of the direct clamp 19. On the other hand, when the seat back angle θ exceeds the value θ0 (see FIG. 2).
1), the occupant wearing the seatbelt 1 is in the rearwardly inclined sitting posture, and the waist rotation amount C is initially larger than in the case where the seatback angle θ is equal to or less than the value θ0 (FIG. 20) (FIG. 2).
3) Considering that the lap belt 3 may be disadvantageous with respect to the rise of the lap belt 3 toward the waist, first, the priority is given to promoting the occupant's upper body forward movement amount B and suppressing the waist rotation amount C. Although the clamp 19 is operated, the direct clamp 18 is not operated. After the occupant upper body forward movement amount is promoted to some extent, and the waist rotation amount C is suppressed, occupant restraint as usual is started.

That is, "the degree of the initial waist rotation amount C"
Based on the occupant condition of the occupant condition, which is one of the factors determining the occupant's body backward tilt, that is, the seatback angle θ, the operation and non-operation of the direct clamp 18 are selected as necessary.
By forcibly adjusting the position of the seat belt 1 to a predetermined position, appropriate restraint is performed.

FIGS. 24 and 25 show a sixth embodiment of the present invention. In the sixth embodiment, pre-tensioners 24 and 25 are provided on both retractors instead of the “direct clamp” of the fifth embodiment. In the event of a frontal collision of the vehicle, the lap belt side pretensioner 2 (not shown)
5 always operates, but the retractor 2 on the shoulder belt side
3, the pretensioner 24 is activated when the seatback angle θ is equal to or less than the set value θ0, based on the determination of the control device 22 that has received the signal from the seatback angle sensor 21. When θ exceeds the set value θ0, the pretensioner 24 is deactivated.

Therefore, as in the case of the fifth embodiment,
The pretensioner 2 is used as necessary based on the occupant condition of the occupant's body backward inclination, which is one of the factors that determine the "degree of the initial waist rotation C", that is, the seatback angle θ.
By selecting the operation / non-operation of 4 and forcibly adjusting the position of the seat belt to a predetermined position, appropriate restraint is performed.

FIGS. 26 to 28 are views showing a seventh embodiment of the present invention. In the seventh embodiment, an occupant mass sensor 26 is set on the seat cushion as a “occupant condition sensor”, and a control device that receives a signal from the occupant mass sensor 26 and determines whether to operate or not operate the direct clamp 18. 22 is set.

The lap belt 3 restrains the occupant by being hooked on the lumbar bone of the occupant. However, a person with a small body is generally considered to have a small lumbar bone. 3 may be disadvantageous with respect to the rise to the waist. Therefore, when it is determined from the occupant weight information obtained from the occupant mass sensor 25 that the occupant is a small occupant, the occupant restraint is started after promoting the occupant's upper body forward movement amount and suppressing the waist rotation amount. In other cases, it is considered that the lap belt 3 is unlikely to move up to the waist, and priority is given to starting the occupant restraint earlier.

FIG. 29 is a diagram showing an eighth embodiment of the present invention. In the eighth embodiment, a pretensioner 24 is provided instead of the “direct clamp” of the seventh embodiment, and the same effect as that of the seventh embodiment can be obtained.

The "direct clamp" and the "pretensioner" of the fifth to eighth embodiments are replaced with "load limiters", and the operation of the load limiters is activated and deactivated as necessary based on the occupant conditions. By selecting and controlling the position and forcibly adjusting the position of the seat belt to a predetermined position, an appropriate restraint may be performed.

FIG. 30 shows a ninth embodiment of the present invention. In the ninth embodiment, the retractors 27 and 28 of the shoulder belt 2 and the lap belt 3 of the seat belt 1 are attached to a seat 29 instead of the vehicle body.

The seat to which the present invention is applied can be applied not only to the front seat but also to seats in the second and subsequent rows, and can be applied to a seat of a vehicle provided with an airbag.

[0063]

According to the first aspect of the present invention, the relative length of the shoulder belt to the lap belt at the time of a vehicle collision is greater than before the collision, so that the amount of forward movement of the occupant upper body is reduced to the amount of occupant waist forward movement. It tends to increase. As a result, the occupant's waist forward movement amount is suppressed, and at the same time, the occupant's upper body forward movement amount is promoted. As a result, the waist rotation amount that promotes the phenomenon of the lap belt slipping up to the abdomen is suppressed. Therefore, it is possible to avoid a situation in which the wearing of the seat belt is troublesome and a feeling of discomfort because the thigh is constantly restrained as in the related art.

According to the second aspect of the present invention, since the shoulder belt has a high elongation and the lap belt has a low elongation, the occupant's waist forward movement is suppressed. It tends to increase compared to the amount of forward movement. Therefore, it is possible to prevent the lap belt from rising toward the abdomen.

According to the third aspect of the present invention, the direct clamp is set on the retractor on the lap belt side, so that the lap belt is hardly stretched. However, the direct clamp is not set on the retractor on the shoulder belt side. , Shoulder belt is easy to stretch. Therefore, it is possible to prevent the lap belt from rising toward the abdomen.

According to the fourth aspect of the present invention, since the pretensioner is set on the retractor on the lap belt side, the lap belt is hardly stretched, but the pretensioner is not set on the retractor on the shoulder belt side. , Shoulder belt is easy to stretch. Therefore, it is possible to prevent the lap belt from rising toward the abdomen.

According to the fifth aspect of the invention, since the load limiter is set on the retractor on the shoulder belt side, the shoulder belt is easily stretched, but the lap belt without the load limiter is not easily stretched on the retractor. Therefore, it is possible to prevent the lap belt from rising toward the abdomen.

According to the sixth aspect of the present invention, the occupant can be restrained appropriately by forcibly adjusting the position of the seat belt to the predetermined position.

According to the seventh aspect of the present invention, the degree of occupant upper body backward tilt, which is one of the factors that determine the degree of the initial waist rotation, is determined based on the occupant conditions. By selecting the non-operation and forcibly adjusting the position of the seat belt to a predetermined position, it is possible to appropriately restrain the occupant.

According to the eighth aspect of the present invention, the degree of inclination of the occupant's body, which is one of the factors that determine the degree of the initial rotation of the waist, is determined based on the occupant conditions. By selecting the non-operation and forcibly adjusting the position of the seat belt to a predetermined position, it is possible to appropriately restrain the occupant.

According to the ninth aspect of the present invention, the occupant upper body leaning degree, which is one of the factors that determine the initial waist rotation amount, is determined based on the occupant conditions by operating the load limiter. By selecting the non-operation and forcibly adjusting the position of the seat belt to a predetermined position, it is possible to appropriately restrain the occupant.

According to the tenth aspect of the present invention, by using the seatback angle sensor as the occupant condition sensor, it is determined whether the occupant is in the rearwardly seated posture, and the occupant is further appropriately restrained. be able to.

According to the eleventh aspect of the present invention, by using the occupant mass sensor as the occupant condition sensor, the occupant's physique can be determined and the occupant can be more appropriately restrained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a seat belt device according to a first embodiment of the present invention in a state where a belt is not mounted.

FIG. 2 is a perspective view corresponding to FIG. 1, showing a belt mounted state.

FIG. 3 is an enlarged perspective view of a dang portion.

FIG. 4 is a sectional view taken along the line SA-SA shown in FIG. 3;

FIG. 5 is a graph showing a difference in belt elongation.

FIG. 6 is a diagram showing a general behavior of a belt-mounted occupant during a vehicle frontal collision.

FIG. 7 is a view showing an occupant behavior when both the lap belt and the shoulder belt have an elongation of 5%.

FIG. 8 is a diagram showing occupant behavior when both the lap belt and the shoulder belt have an elongation of 15%.

FIG. 9 is a view for explaining a relationship in which a waist rotation amount can be suppressed by suppressing an occupant's waist forward movement amount.

FIG. 10 is a view for explaining a relationship in which a waist rotation amount can be suppressed by promoting an occupant upper body forward movement amount.

FIG. 11 is a sectional view showing a retractor without a direct clamp according to a second embodiment of the present invention.

FIG. 12 is a sectional view showing a retractor having a direct clamp.

FIG. 13 is a graph showing an influence of a direct clamp on a belt pull-out characteristic.

FIG. 14 is a sectional view showing a pretensioner according to a third embodiment of the present invention.

FIG. 15 is a graph showing the effect of a pretensioner on belt pull-out characteristics.

FIG. 16 is a graph showing the effect of a load limiter on belt pull-out characteristics according to a fourth embodiment of the present invention.

FIG. 17 is a side view of the seat according to the fifth embodiment of the present invention in a state where the belt is not mounted.

FIG. 18 is a block diagram showing a part of a signal flow according to the fifth embodiment;

FIG. 19 is a flowchart showing a direct clamp operation determination in the fifth embodiment.

FIG. 20 is a side view of the seat showing a state where the seat back angle θ is θ ≦ θ0.

FIG. 21 is a side view of the seat showing a state where the seat back angle θ is θ> θ0.

FIG. 22 is an enlarged view of the waist in the state of FIG. 20;

FIG. 23 is an enlarged view of the waist in the state of FIG. 21;

FIG. 24 is a block diagram showing a part of a signal flow according to a sixth embodiment of the present invention.

FIG. 25 is a flowchart showing an operation determination of a pretensioner according to a sixth embodiment.

FIG. 26 is a side view of the seat according to the seventh embodiment of the present invention in a state where the belt is not mounted.

FIG. 27 is a block diagram showing a part of a signal flow according to the seventh embodiment;

FIG. 28 is a flowchart showing the operation determination of the pretensioner according to the seventh embodiment.

FIG. 29 is a block diagram showing a part of a signal flow according to an eighth embodiment of the present invention.

FIG. 30 is a perspective view showing a seat according to a ninth embodiment of the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 seat belt 2 shoulder belt 3 lap belt 4 tongue 5, 11, 16, 23, 27 retractor (shoulder belt side) 6, 9, 13, 17, 28 retractor (lap belt side) 7, 20, 29 seat 10, 18 , 19 Direct clamp 14, 24 Pretensioner 21 Seat back angle sensor (occupant condition sensor) 22 Controller 26 Occupant mass sensor (occupant condition sensor)

Claims (11)

[Claims] A seat belt is formed by attaching a shoulder belt and a lap belt to a tongue, and at least one of both ends of the seat belt is wound around a vehicle body or a retractor provided on a seat. A vehicle seatbelt device for engaging a buckle provided on a vehicle body or a seat with a tongue to restrain an occupant on the seat, comprising: means for increasing a relative length of the shoulder belt to a lap belt; A vehicle seat belt device, wherein a relative length of a belt to a lap belt is greater than before a collision. 2. The vehicle seat belt device according to claim 1, wherein the shoulder belt has a higher elongation than the lap belt. 3. The retractor retracts the shoulder belt and the lap belt of the seat belt respectively, and the direct clamp is set only on the retractor on the lap belt side, and the direct clamp is set on the retractor on the shoulder belt side. The vehicle seatbelt device according to claim 1, wherein the vehicle seatbelt device is not provided. 4. A retractor for winding a shoulder belt and a lap belt of a seat belt, respectively, wherein a pretensioner is set only on the retractor on the lap belt side, and a pretensioner is set on the retractor on the shoulder belt side. The vehicle seatbelt device according to claim 1, wherein the vehicle seatbelt device is not provided. 5. The retractor retracts a shoulder belt and a lap belt of a seat belt, and a load limiter is set only on the shoulder belt-side retractor, and a load limiter is set on the lap belt-side retractor. The vehicle seatbelt device according to claim 1, wherein the vehicle seatbelt device is not provided. 6. A seat belt is formed by attaching corresponding ends of a shoulder belt and a lap belt to respective tongues, and at least one of both ends of the seat belt is wound around a vehicle body or a retractor provided on a seat. In a vehicle seatbelt device that engages a tongue with a buckle provided on a vehicle body or a seat to restrain an occupant on the seat, a means for forcibly adjusting the position of the seatbelt to a predetermined position is provided, A vehicle seat belt device for forcibly adjusting a position of at least one of a shoulder belt and a lap belt at the time of a vehicle collision to a predetermined position. 7. An occupant condition sensor configured to wind up a shoulder belt and a lap belt of a seat belt with a retractor, and to detect an occupant condition of an occupant wearing the seat belt. A direct clamp is set on both the retractor on the side and the shoulder belt side, and a control device is set to control the activation / deactivation of each direct clamp based on the occupant condition information detected by the occupant condition sensor. When the occupant condition detected by the occupant condition sensor satisfies a certain condition, the direct clamp of both retractors is operated, and when the occupant condition does not satisfy the condition, only the direct clamp of the lap belt side retractor is operated, No direct clamp on the shoulder belt side retractor Vehicle seat belt apparatus according to claim 6,. 8. A lap belt comprising: an occupant condition sensor configured to wind a shoulder belt and a lap belt of a seat belt by a retractor, and to detect an occupant condition of an occupant wearing the seat belt. A pretensioner is set for both the retractor on the side and the shoulder belt side, and a control device is set to control the operation / non-operation of each pretensioner based on the occupant condition information detected by the occupant condition sensor. When the occupant condition detected by the occupant condition sensor satisfies a certain condition, the pretensioners of both retractors are operated, and when the occupant condition does not satisfy the condition, only the pretensioner of the lap belt side retractor is operated, 7. The pretensioner of the shoulder belt side retractor is deactivated. Seat belt device for a vehicle. 9. A lap belt comprising: an occupant condition sensor configured to wind a shoulder belt and a lap belt of a seat belt by a retractor, and to detect an occupant condition of an occupant wearing the seat belt. A load limiter is set on both the retractor on the side and the shoulder belt side, and a control device that controls the operation / non-operation of each load limiter based on the occupant condition information detected by the occupant condition sensor is set. When the occupant condition detected by the occupant condition sensor satisfies a certain condition, the load limiters of both retractors are deactivated, and when the occupant condition does not satisfy the condition, only the load limiter of the shoulder belt side retractor is activated. 7. The load limiter of the retractor on the lap belt side is deactivated. For a seat belt device of the vehicle. 10. A seatback angle sensor is used as an occupant condition sensor, and a seatback angle detected by the seatback angle sensor is used as an occupant condition, and an occupant is determined based on whether the seatback angle is equal to or less than a certain value. The vehicle seat belt device according to any one of claims 6 to 9, wherein it is determined whether the condition satisfies a certain condition. 11. An occupant condition sensor, wherein an occupant mass sensor is used, and an occupant weight detected by the occupant mass sensor is used as an occupant condition. The vehicle seat belt device according to any one of claims 6 to 9, wherein it is determined whether or not the vehicle is in the vehicle.