JP2006290259A - Seat belt device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To become sufficiently effective against a collision (side collision) with load applied from the side of a vehicle at the time of a collision or a collision prediction by solving the problem that a sufficient effect can't be necessarily obtained against the collision (side collision) with load applied from the side of the vehicle at the time of the collision or the collision prediction. <P>SOLUTION: This seat belt device is provided with a shoulder belt 27 for restraining a shoulder part to a breast part of an occupant 13 and a lap belt 28 for restraining the waist part of the occupant 13. The lap belt 28 is provided with first and second distal end belt parts 31 and 32 for branching the distal end into two parts. The first distal end belt part 31 is passed through a lower part of a seat surface 16. By providing the belt part 31 on the lower part of the seat surface 16, the belt part 31 is fixed to a driving device (seat side pretensioner) 34 for making the waist part of the occupant 13 close to the center of a vehicle body. The second distal end belt part 31 is fixed to a seat belt anchor 25 provided on a vehicle body side surface 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a seat belt device capable of restraining an occupant to a seat at the time of a collision or predicting a collision and moving the occupant to the center of a vehicle body.

Practical seat belt devices are usually used in a system called a three-point system. The seat belt is composed of a shoulder belt and a lap belt, and is wound around an occupant seated on the shoulder belt and the lap belt. Alternatively, the seat belt is generally locked with a pretensioner at the time of collision prediction.
In recent years, as a seat belt device, an attempt to improve the restraining performance of an occupant and an attempt to improve wearability have been made.

As such a seat belt device, a device that prevents the seat belt from being pulled out at the time of a collision or a collision prediction, and a device that is provided with a seat belt guide that regulates the route of the seat belt are known (for example, (See Patent Documents 1 to 3.)
JP 2004-230991 A (page 8, FIG. 2) JP-T 2002-539012 (page 8, FIG. 1) JP-A-2004-330925 (page 11, FIG. 1)

  FIG. 6 is a diagram for explaining a basic configuration of a conventional seat belt device provided with a lap belt for protecting the lumbar region. The seat belt device 100 is a three-point seat belt, and includes a seat belt 101, a shoulder belt 102 and a second belt. The first and second lap belts 103 and 104 are configured to support the waist with a double structure of the first and second lap belts 103 and 104, and the first and second lap belts 103 and 104 are folded back. A pretensioner 105 is provided in the portion to improve the restraining performance of the occupant.

  FIG. 7 is a diagram for explaining the basic structure of a conventional seat belt device having a double structure of a lap belt. The seat belt device 110 is a three-point seat belt, and the seat belt 111 is replaced with a shoulder belt 112 and a first belt 1. The lap belt is composed of second lap belts 113 and 114, and the waist structure is supported by the double structure of the first and second lap belts 113 and 114, and an air bag 115 is attached to the second lap belt 114, and an occupant It is intended to improve the restraining performance of 119.

FIGS. 8A and 8B are views for explaining the basic configuration of a conventional airbag apparatus that brings an occupant closer to the center of the vehicle body.
In (a) and (b), the airbag device 120 includes a first side airbag 124 provided on the door 123 side of the seat back 122 of the seat (vehicle seat) 121 and a waist portion of the occupant 129 of the seat back 122. 2 and a second side airbag 125 provided on the door 123, and the space between the door 123 and the seat back 122 is filled with the first and second side airbags 124 and 125 at the time of a collision. At the same time, the second side airbag 125 tries to bring the passenger 129 to the center of the passenger compartment.

  However, in the seat belt device 100 shown in FIG. 6, even if the first and second lap belts 103 and 104 and the pretensioner 105 can improve the occupant's restraining performance, for example, a collision in which a load is applied from the side of the vehicle. (Side collision) may not always have a sufficient effect.

  In addition, in the seat belt device 110 shown in FIG. 7, the waist is supported by the double structure of the first and second lap belts 113 and 114, and an airbag 115 is attached to the second lap belt 114 to Even if the restraining performance of 119 can be improved, for example, it is not always possible to exert a sufficient effect against a collision (side collision) in which a load is applied from the side of the vehicle, similarly to the seat belt device 100 shown in FIG. There was a case.

  Further, in the airbag device 120 shown in FIGS. 8A and 8B, the occupant 129 is brought closer to the center of the passenger compartment, and for example, it is effective for a collision (side collision) in which a load is applied from the side of the vehicle. However, in general, airbags cannot be reused for inflation and deployment, and cannot be applied by the time of collision prediction. The collision prediction time is, for example, when the G sensor or the like detects acceleration exceeding a predetermined range, and is a case where the collision can be avoided in advance.

  That is, a seatbelt device that can exhibit sufficient effect against a collision (side collision) in which a load is applied from the side of the vehicle at the time of collision or at the time of collision prediction is desired.

  The present invention solves the problem that a sufficient effect cannot be exerted against a collision (side collision) in which a load is applied from the side of the vehicle at the time of collision or at the time of collision prediction. It is an object of the present invention to provide a seat belt device capable of exhibiting sufficient effectiveness against a collision (side collision) in which a load is applied from the side.

  The invention according to claim 1 is a seat belt device comprising a shoulder belt that restrains the chest from the shoulder of the occupant and a lap belt that restrains the waist of the occupant, the lap belt having a bifurcated tip. The first and second tip belt portions are provided, and the first tip belt portion is provided below the seat seat surface and provided below the seat seat surface, thereby fixing the occupant's waist to the vehicle body center. In addition, the second tip belt portion is fixed to a seat belt anchor provided on the side surface of the vehicle body.

  For example, if the occupant can be brought to the center of the vehicle body (center of the passenger compartment) at the time of a collision (side collision) in which a load is applied from the side of the vehicle or when a collision is predicted, sufficient effect can be exerted against the side collision. Therefore, it is preferable.

  Accordingly, the lap belt is provided with first and second leading end belt portions with the leading end bifurcated, and the first leading end belt portion is provided below the seat seating surface and below the seat seating surface, so that the occupant Is fixed to a drive device that brings the waist of the vehicle toward the center of the vehicle body, and the second tip belt portion is fixed to a seat belt anchor provided on the side surface of the vehicle body, so that when a load is applied from the side of the vehicle (side collision) or When a collision is predicted, the occupant can be brought to the center of the vehicle body.

  The invention according to claim 2 is the buckle pretensioner in which the driving device applies tension to the buckle that supports the front end of the shoulder belt, the base of the lap belt, and the first front end belt portion, and is disposed below the buckle. It is characterized by that.

  By applying tension to the buckle that supports the front end of the shoulder belt, the base of the lap belt, and the first front end belt portion with the drive device, and making the drive device a buckle pretensioner disposed below the buckle, for example, The buckle pretensioner can be disposed under the seat, and the restrictions on the layout of the seat belt device can be removed.

The invention according to claim 3 is characterized in that the first and second tip belt portions are formed to be superposed.
By forming the first and second tip belt portions so as to be superposed, it is possible to improve the protection performance of the seat belt while ensuring the usability and appearance of the conventional three-point seat belt.

The invention according to claim 4 is characterized in that the first and second tip belt portions are provided with holding means for holding them detachably.
By providing holding means for detachably holding the first and second tip belt portions, it is possible to store the same in appearance as a conventional three-point seat belt before mounting the seat belt.

The invention according to claim 5 is characterized in that the driving device is provided with occupant posture detection means for detecting the posture of the occupant, and the occupant's waist is moved to a predetermined position based on information of the occupant posture detection means.
The drive device is equipped with occupant posture detection means for detecting the occupant's posture, and by adjusting the tension of the seat belt according to the occupant's posture based on the information of the occupant posture detection means, the occupant's waist is brought to a predetermined position. The distance between the occupant and the passenger compartment side wall can always be kept appropriate.

  In the invention according to claim 1, the lap belt is provided with first and second tip belt portions with the tip bifurcated, the first tip belt portion is routed below the seat seat surface, and the seat seat surface Since the lower waist belt is fixed to the drive device that brings the occupant's lower back to the center of the vehicle body and the second front end belt portion is fixed to the seat belt anchor provided on the side surface of the vehicle body, a collision that applies a load from the side of the vehicle ( When a side collision occurs or when a collision is predicted, the occupant can be brought to the center of the vehicle body. As a result, it is possible to exert a sufficient effect against a side collision. For example, when a side airbag is provided between the occupant and the vehicle body side surface (vehicle compartment side wall), the side airbag deployment space is reduced. There is an advantage that it can be secured sufficiently.

  In the invention according to claim 2, the driving device applies tension to the buckle that supports the front end of the shoulder belt, the base of the lap belt, and the first front end belt portion, and the driving device is disposed under the buckle. Since the tensioner is used, for example, the buckle pretensioner can be disposed under the seat or the like, and the restriction on the layout of the seat belt device can be removed. As a result, there is an advantage that the degree of freedom in designing the seat belt device can be expanded.

  In the invention according to claim 3, since the first and second tip belt portions are formed so as to be superposed, it is possible to improve the protection performance of the seat belt while ensuring the usability and appearance of the conventional three-point seat belt. There is an advantage of being able to plan.

  In the invention according to claim 4, since the first and second tip belt portions are provided with holding means that are detachable from each other, the external appearance is the same as that of the conventional three-point seat belt before the seat belt is mounted. Can be stored. As a result, there is an advantage that the appearance of the seat belt device can be improved.

  In the invention according to claim 5, the driving device includes occupant posture detection means for detecting the posture of the occupant, and adjusts the tension of the seat belt according to the occupant posture based on information of the occupant posture detection means. By moving the occupant's lower back to a predetermined position, the distance between the occupant and the passenger compartment side wall can always be kept appropriate. As a result, occupant protection performance can be improved.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a front view of a seat belt apparatus according to the present invention. A seat belt apparatus (vehicle seat belt apparatus) 10 includes a vehicle body side pretensioner 21 provided below a vehicle body side surface (vehicle body side portion) 11, A seat belt 22 provided with first and second tip belt portions 31 and 32 by branching the tip into two branches and a seat belt provided above the side surface 11 of the vehicle body are provided to extend freely from the tensioner 21. An upper belt guide 33 for guiding the belt 22, a tongue (belt metal fitting) 23 interposed in the middle of the seat belt 22, a buckle 24 provided on the seat 12 side for detachably attaching the tongue 23, A seat-side pretensioner 34 as a driving device provided inside the seat cushion of the seat for connecting the first tip belt portion 31; A seat belt anchor 25 provided on the vehicle body side face 11 side to mount the second distal belt 32 of the seatbelt 22, made of.

  The seat (vehicle seat) 12 includes a seat cushion 14 that supports the waist and legs of the occupant 13 and a seat back 15 that supports the back of the occupant 13. Reference numeral 16 denotes a seat seat surface.

  The seat belt 22 is wound around the seat 12 substantially horizontally around the abdomen of the occupant 13 from the front end of the shoulder belt 27 through the shoulder opening of the occupant 13 from the vehicle body side pretensioner 21 and passed to the waist. A lap belt 28 to be attached, a first tip belt portion 31 branched from the lap belt 28 into the forked portion and connected to the seat side pretensioner 34 through the seat cushion 14, and a forked portion from the lap belt 28 By interposing the second tip belt portion 32 connected to the belt anchor 25 and the first and second tip belt portions 31 and 32, the first and second tip belt portions 31 are disposed when the seat belt 22 is not attached. , 32 are integrated together, and the first and second tip belt portions 31, 32 are separated when the seat belt is worn. And the fastener 35 as a means, consisting of.

  The fastener 35 includes a male fastener 36 attached to the first tip belt portion and a female fastener 37 attached to the second tip belt portion.

  The seat belt device 10 is a seat belt device including a shoulder belt 27 that restrains the chest from the shoulder of the occupant 13 and a lap belt 28 that restrains the waist of the occupant 13. The first and second tip belt portions 31 and 32 that are bifurcated are provided, and the first tip belt portion 31 is provided below the seat seat surface 16 and below the seat seat surface 16 so that the passenger 13 It can be said that the lower end belt portion 31 is fixed to the seat belt anchor 25 provided on the side surface 11 of the vehicle body while the waist portion is fixed to the driving device (seat-side pretensioner) 34 that moves toward the center of the vehicle body.

  In the figure, 41 is a camera as an occupant posture detection means for detecting the posture of the occupant 13, 42 is a predetermined pull-in to the seat side pretensioner 34 from the camera information, and the lumbar part of the occupant 13 is moved to a predetermined position. The control unit 43 is a G sensor (acceleration sensor) that detects a side collision. Note that the time of a collision is a case where an impact is detected by the G sensor 43 and a side collision actually occurs. The time of a collision prediction is a time when the G sensor 43 detects an acceleration exceeding a predetermined range, for example, Rollover or rollover prediction by various driving state sensors (lateral acceleration sensor, roll angular velocity sensor, etc.) provided on the vehicle, and side collision prediction by radar devices (ultrasound or other radio wave transmitters, cameras, etc.) provided on the side of the vehicle body May be included.

  The seat belt device 10 includes an occupant posture detection means (camera) 41 that detects the posture of the occupant 13 in the driving device (seat-side pretensioner) 34, and seats according to the posture of the occupant 13 at the time of a collision or when a collision is predicted. By adjusting the tension of the belt 22, the waist of the occupant 13 can be moved to a predetermined position, and the distance between the occupant and the passenger compartment side wall can always be kept appropriate. As a result, the protection performance of the occupant 13 can be improved.

2 (a) and 2 (b) are explanatory views showing forms when the seat belt device according to the present invention is not worn and when it is worn.
(A) shows the retracted state of the seat belt 22 when it is not worn, and the tongue 23 is removed from the buckle 24 as shown by the arrow a1, so that the seat belt 22 is mutually connected by the vehicle body side pretensioner 21 and the seat side pretensioner 34. The male fastener 36 of the first tip belt portion 31 and the female fastener 37 of the second tip belt portion 32 are brought close to each other so that the first and second tip belt portions 31 and 32 are partially integrated as belts. Superimpose naturally.

  That is, in the seat belt device 10, the first and second tip belt portions 31 and 32 are formed so as to be superposed, so that the convenience and appearance of the conventional three-point seat belt are secured and the seat belt 22 is protected. The performance can be improved.

  In (b), the state of the seat belt 22 when worn is shown, and the occupant 13 is seated on the seat 12 and the tongue 23 is inserted into or pulled into the buckle 24 as indicated by the arrow a2, The seat belt 22 can be pulled out from the vehicle body side pretensioner 21 and the seat side pretensioner 34, the fastener 35 can be removed, and the seat belt 22 can be attached.

  That is, the seat belt device 10 is provided with holding means (fasteners) 35 that are detachably held on the first and second tip belt portions 31 and 32. The seat can be stored in the same manner as the seat belt. As a result, the appearance of the seat belt device 10 can be improved.

  That is, although the seat belt device 10 includes the bifurcated first and second tip belt portions 31 and 32, a general three-point seat belt can be used both when worn and when not worn. This is a form that is easy to use.

3A and 3B are explanatory views showing the operation of the seat belt device according to the present invention.
In (a), the seat belt device 10 is shown when worn, and the occupant 13 is seated at the center of the seat 12, and the distance between the occupant 13 and the center of the vehicle body (center of the vehicle compartment) of the seat cushion 14 is S1. To do.

  In (b), when there is a collision (hereinafter referred to as “side collision”) from the vehicle body side surface 11, the seat side pretensioner 34 is operated and the first belt leading end portion 31 is drawn (taken up) as shown by an arrow b 1. ) To bring the occupant 13 toward the center of the vehicle body (center of the passenger compartment). At this time, when the distance between the occupant 13 and the seat cushion 14 on the vehicle body center (chamber compartment center) side is S2, it can be seen that the distance S2 is shorter than the distance S1 shown in FIG. Reference numeral 19 denotes a collision vehicle.

  In other words, the seat belt device 10 includes first and second front belt portions 31 and 32 having bifurcated ends at the lap belt 28, and the first front belt portion 31 passes under the seat seat surface 16. And a seat provided with a second tip belt portion 31 on the side surface 11 of the vehicle body while being fixed to a drive device (seat-side pretensioner) 34 that moves the waist of the occupant 13 toward the center of the vehicle body by being provided below the seat seating surface 16. Since it is fixed to the belt anchor 25, the occupant 13 can be brought to the center of the vehicle body at the time of a collision (side collision) in which a load is applied from the side of the vehicle or when a collision is predicted.

  As a result, it is possible to exert a sufficient effect against a side collision. For example, when a side airbag is provided between the occupant 12 and the vehicle body side surface (vehicle compartment side portion) 11, Sufficient development space can be secured.

  FIG. 4 is a front view of a seatbelt device according to another embodiment of the present invention. A seatbelt device (vehicle seatbelt device) 50 includes a vehicle body side pretensioner 51 provided below the vehicle body side surface 11 and the pretensioner. One end of the belt 51 is provided so as to extend freely, and a seat belt 52 provided with first and second tip belt portions 61 and 62 by bifurcating the tip, and a seat belt 52 provided above the side surface 11 of the vehicle body. An upper belt guide 63 for guiding the belt, a tongue (belt fitting) 53 interposed in the middle of the seat belt 52, a buckle 54 provided on the vehicle body side for detachably attaching the tongue 23, and the buckle 54 obliquely downward A buckle pretensioner 64 as a driving device provided on the vehicle body side and a second front end belt portion 62 of the seat belt 52 are removed. A seat belt anchor 55 provided on the vehicle body side surface 11 side to kick consists. In the figure, 11 is a vehicle body side surface, 12 is a seat, 13 is an occupant, 14 is a seat cushion, 15 is a seat back, 16 is a seat seat surface, and 68 is a guide (roller) for guiding the buckle 54.

  The seat belt 52 is wound around the seat 12 substantially horizontally around the abdomen of the occupant 13 from the front end of the shoulder belt 57 through the shoulder opening of the occupant 13 from the vehicle body side pretensioner 51 and passed to the waist. A lap belt 58 to be attached, a first tip belt portion 61 branched from the lap belt 58 into the fork and connected to the buckle 54 through the seat cushion 14, and a seat belt anchor 55 branched from the lap belt 58 into the fork. When the seat belt 52 is not attached, the first and second tip belt portions 61 and 62 are interposed between the second tip belt portion 62 and the first and second tip belt portions 61 and 62. As a holding means that separates the first and second tip belt portions 61 and 62 when a part of them is integrated and the seat belt is worn And Asuna 65, consisting of.

  The fastener 65 includes a male fastener 66 attached to the first tip belt portion 61 and a female fastener 67 attached to the second tip belt portion 62.

  In the seat belt device 50, a driving device (buckle pretensioner) 64 applies tension to the tip of the shoulder belt 57, the root of the lap belt 58, and the buckle 54 that supports the first tip belt portion 61, and the driving device Since the buckle pretensioner 64 disposed below the buckle 54 is used, for example, the buckle pretensioner 64 can be disposed under the seat (vehicle seat) 12 or the like, and the restriction on the layout of the seat belt device 50 is removed. Can do. As a result, the degree of freedom in designing the seat belt device 50 can be expanded.

5 (a) and 5 (b) are explanatory views showing forms when the seat belt device according to another embodiment of the present invention is not worn and when worn.
(A) shows the retracted state of the seat belt 52 when not worn, and the tongue 53 is removed from the buckle 54 as shown by the arrow c1, whereby the seat belt 52 is wound around the vehicle body side pretensioner 51, and the first tip belt portion The male fastener 66 of 61 and the female fastener 67 of the second tip belt portion 62 are brought close to each other, and the first and second tip belt portions 61 and 62 are naturally overlapped as a partially integrated belt.

  In (b), the state in which the seat belt 52 is routed at the time of wearing is shown, and the occupant 13 is seated on the seat 12, and the tongue 53 is inserted into or pulled into the buckle 54 as indicated by the arrow c2, The seat belt 52 can be pulled out from the vehicle body side pretensioner 21, the fastener 65 can be removed, and the seat belt 22 can be attached.

  In the seat belt device according to the present invention, as shown in FIG. 2, the seat side pretensioner 34 is provided in the seat cushion 14. However, the seat belt device is not limited to this. There is no problem if there is.

  The seat belt device according to the present invention is suitable for use in vehicles such as sedans and minivans.

It is a front view of the seat belt device concerning the present invention. It is explanatory drawing which shows the form at the time of the non-wearing and mounting | wearing of the seatbelt apparatus which concerns on this invention. It is explanatory drawing which shows the effect | action of the seatbelt apparatus which concerns on this invention. It is a front view of the seatbelt apparatus of another Example which concerns on this invention. It is explanatory drawing which shows the form at the time of the non-wearing of the seatbelt apparatus of another Example which concerns on this invention, and a mounting | wearing. It is a figure explaining the basic composition of the seatbelt apparatus provided with the lap belt which protects the conventional waist | hip | lumbar part. It is a figure explaining the basic composition of the seatbelt apparatus which used the conventional lap belt as the double structure. It is a figure explaining the basic composition of the conventional air bag device which brings an occupant to the center of a vehicle body.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10,50 ... Seat belt apparatus, 11 ... Vehicle body side surface, 13 ... Passenger, 16 ... Seat seat surface, 22 ... Seat belt, 24, 54 ... Buckle, 25 ... Seat belt anchor, 27 ... Shoulder belt, 28, 58 ... Lap Belt 31, 61... First tip belt portion 32. Second tip belt portion 34. Drive device (sheet side pretensioner) 35. Holding means (fastener) 64. Drive device (buckle pretensioner) .

Claims (5)

A seat belt device comprising a shoulder belt that restrains the chest from the shoulder of the occupant, and a lap belt that restrains the waist of the occupant,
The lap belt includes first and second tip belt portions having a tip bifurcated, and the first tip belt portion is provided below the seat seat surface and provided below the seat seat surface. A seat belt device characterized in that the waist portion is fixed to a driving device that moves toward the center of the vehicle body, and the second tip belt portion is fixed to a seat belt anchor provided on the side surface of the vehicle body.   The drive device is a buckle pretensioner that applies tension to a front end of the shoulder belt, a base of the lap belt, and a buckle that supports the first front end belt portion, and is disposed below the buckle. The seat belt device according to claim 1.   3. The seat belt device according to claim 1, wherein the first and second leading end belt portions are formed so as to be superposed.   4. The seat belt device according to claim 3, wherein holding means for holding the first and second tip belt portions so as to be detachable from each other is provided.   5. The drive device according to claim 1, further comprising: an occupant posture detection unit that detects the posture of the occupant, and moves the lumbar portion of the occupant to a predetermined position based on information of the occupant posture detection unit. The seatbelt apparatus of any one of Claims.

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