JP2008260457A - Seatbelt device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seatbelt device improved in a holding property of an occupant during normal driving, without giving a strong oppressive feeling to the occupant. <P>SOLUTION: Side part bag elements 19A, 19B capable of expanding/contracting are provided at positions facing both outside portions of a waist portion or a thigh portion of the occupant m of a wrap belt 4a. An air supplying/discharging device 30 supplying/discharging compressed air to/from the side part bag elements 19A, 19B is provided. The compressed air is supplied from the air supplying/discharging device 30 to the side part bag elements 19A, 19B when the wrap belt 4a is equipped, and the side part bag elements 19A, 19B are expanded to restrain the occupant. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a seat belt device for restraining an occupant seated on a vehicle seat by webbing.

  In a seat belt device installed in a vehicle, a webbing for restraining an occupant is wound around a belt reel so that the webbing is pulled out to an appropriate length when the seat belt is mounted, and the webbing drawer is locked by a lock mechanism in an emergency. It has become.

As this type of seat belt device, there is a device that incorporates a bag body in the webbing, injects high-pressure gas into the bag body when the vehicle detects an emergency state, and restrains the occupant by the expansion of the bag body in the webbing. Has been devised (see, for example, Patent Document 1).
JP 2006-27402 A

  However, since this conventional seat belt device expands the bag body in an emergency and restrains the occupant, the bag body cannot be used during normal operation.

  Further, at present, it is desired to devise a technique that can appropriately support an occupant without giving a strong feeling of pressure to the occupant seated on the seat even during normal driving.

  Therefore, the present invention is intended to provide a seat belt device that can enhance the occupant's holdability during normal operation without giving a strong feeling of pressure to the occupant.

The invention according to claim 1, which solves the above problem, is a seat belt device including a lap belt (for example, a lap belt 4a in an embodiment described later) that supports a waist or thigh of an occupant. Infusing means for providing inflatable / shrinkable bags (for example, side bags 19A and 19B in the embodiments described later) at positions facing both outer portions of the waist or thigh of the occupant and injecting gas into the bags (For example, an air supply / discharge device 30 in an embodiment described later) is provided.
As a result, when gas is injected into the bag body by the injection means, the bag body expands at a position facing both the waist or thigh of the lap belt occupant, and the bag body covers the occupant's waist or thigh. It becomes restrained from both sides.

According to a second aspect of the present invention, in the seat belt device according to the first aspect, an occupant restraint wall (for example, an occupant restraint in an embodiment described later) that restrains the bag body on an outer portion of the waist or thigh of the occupant. Wall 20A, 20B) and a bellows-like stretchable wall (for example, stretchable walls 21A, 21B in embodiments described later) for displacing the occupant restraint wall by gas injection and discharge. And
Thereby, when gas is injected into the bag body, the occupant restraint wall is displaced toward the outer side of the occupant by extending the telescopic wall, and the occupant restraint wall restrains the occupant.

According to a third aspect of the present invention, in the seatbelt device according to the second aspect, an end of the occupant restraint wall near the occupant center in the vehicle width direction is fixed to the lap belt, An end portion spaced from the passenger center side is a free end.
As a result, when gas is injected into the bag body and the telescopic wall extends, the occupant restraint wall displaces the other end with the end near the occupant center as a fulcrum, so that the occupant's waist or thigh is outside It becomes restrained by the occupant restraint wall from the part.

According to a fourth aspect of the present invention, in the seat belt device according to any one of the first to third aspects, the injection means injects gas in conjunction with the attachment of the lap belt. .
Thus, when the occupant is seated on the seat and the lap belt is attached, the bag body of the lap belt is inflated, and the lumbar portion and the thigh portion of the occupant are restrained from both outer sides.

  According to the first aspect of the present invention, since the waist or thigh of the occupant can be restrained from both outer sides by injecting gas into the bag body of the lap belt, the occupant is not given a strong feeling of pressure. The occupant holdability during normal operation can be improved.

  According to invention of Claim 2, a bag body is equipped with the passenger | crew restraint wall which restrains a passenger | crew's waist | hip | lumbar part or a thigh part, and the bellows-like expansion-contraction wall which displaces a passenger | crew restraint wall by gas injection | pouring and discharge | emission. Therefore, the occupant restraint wall can be stably brought into close contact with the occupant due to the bellows-like regular displacement of the telescopic wall.

  According to the third aspect of the present invention, when gas is injected into the bag body, the occupant restraint wall displaces the other end with the end portion near the occupant center as a fulcrum. It is possible to increase the restraint on the.

  According to the fourth aspect of the present invention, gas is injected into the bag body in conjunction with the wearing of the lap belt, so that the occupant can be quickly held by the bag body when the lap belt is worn.

Embodiments of the present invention will be described below with reference to the drawings.
First, the first embodiment shown in FIGS. 1 to 6 will be described.
FIG. 1 shows an overall schematic configuration of a seat belt device 1 according to the present invention. In FIG. 1, reference numeral 6 denotes a seat on which an occupant m is seated. The seat belt device 1 of this embodiment is a so-called three-point seat belt device, and a webbing 4 is drawn upward from a retractor 3 attached to the center pillar 2, and the webbing 4 is supported on the upper side of the center pillar 2. The web anchor 4 is inserted into the through anchor 5 and the tip of the webbing 4 is fixed to the vehicle body via the outer anchor 7 on the outer side of the seat 6. A tongue plate 8 is inserted between the through anchor 5 and the outer anchor 7 of the webbing 4, and the tongue plate 8 can be attached to and detached from the buckle 9 fixed to the vehicle body floor on the inner side of the vehicle body of the seat 6. It has become.

  The webbing 4 is wound around the retractor 3 in the initial state, and when the occupant m is pulled out by hand to fix the tongue plate 8 to the buckle 9, the occupant m mainly has a shoulder and a chest, and further, a waist and a thigh. Is restrained with respect to the sheet 6. Specifically, the webbing 4 has a shoulder belt 4b that constrains the shoulder and chest of the occupant m with the tongue plate 8 attached to the buckle 9 sandwiched between the tongue plate 8 and the outer anchor 7 side. The portion extending to the lap belt 4a forms a lap belt 4a that restrains the waist and thighs of the occupant m.

  As shown in FIGS. 1 to 3, the lap belt 4a has a pair of side bag bodies 19A and 19B (bag body) and a central bag body 19C on the back surface facing the waist and thighs of the occupant m when worn. I have. The central bag 19C is disposed at a substantially central position in the longitudinal direction of the lap belt 4, and faces the upper surface of the waist or thigh of the occupant m seated on the seat cushion 6a when the lap belt 4a is worn. . Further, the side bag bodies 19A and 19B are arranged at both longitudinal positions of the lap belt 4 with the central bag body 19C interposed therebetween, and when the lap belt 4a is worn, the occupant m seated on the seat cushion 6a or It faces the lateral outer surfaces of both sides of the thigh. Further, as shown in FIG. 2, the lap belt 4a is provided with a passage 22 connected to each of the bag bodies 19A, 19C, 19B through the communication holes 23A, 23B, 23C. As shown in FIG. 2, the outer anchor 7 is connected to an external air pipe 29. The air pipe 29 is connected to an air supply / discharge device 30 (injection means) including a supply / discharge valve, a compressor, and an accumulator (not shown).

  Here, as shown in FIGS. 3 and 4 (A) and 4 (B), the side bag bodies 19A and 19B are relatively thick occupant restraint walls that directly contact the outer part of the waist or thigh of the occupant m. 20A, 20B, and bellows-like stretchable walls 21A, 21B that expand and contract by injecting and discharging compressed air (gas) to displace the occupant restraint walls 20A, 20B. Each of the occupant restraint walls 20A and 20B is formed of a soft member such as urethane, and an end near the occupant center is fixed to the lap belt 4a, and the other end is a free end that freely swings and displaces. When the webbing 4 is stored in the side bag bodies 19A and 19B, the elastic walls 21A and 21B are folded as shown in FIG. In addition, an annular frame (not shown) is built in the bellows ridges of the stretchable walls 21A, 21B, and the side bag bodies 19A, 19B are inflated and shrunk toward a certain direction during expansion / contraction associated with air supply / discharge. It is set to be. In other words, the expansion and contraction walls 21A and 21B are restricted from bulging in the outer peripheral direction by the annular frame, thereby concentrating the air pressure introduced into the expansion and contraction walls 21A and 21B in the occupant restraint direction.

  On the other hand, the central bag body 19C is formed in a relatively simple bag shape as shown in FIGS. 5A and 5B, and a state in which the entire region in the longitudinal direction swells and contracts due to air injection and discharge. And can be switched.

  Further, the buckle 9 is provided with a buckle switch 32 for detecting that the tongue plate 8 is inserted into the buckle 9, and a signal detected by the buckle switch 32 is a controller for controlling the air supply / discharge device 30. 31 is input. The controller 31 is connected to a pressure sensor (not shown) that detects the pressure in the air pipe 29.

  When the detection signal is input from the buckle switch 32, the controller 31 appropriately controls the compressor and the supply / discharge valve of the air supply / discharge device 30, thereby the internal pressure of the side bags 19A, 19B and the central bag 19C. Is maintained within the set pressure range.

FIG. 6 is a flowchart showing the control by the controller 31.
The control by the controller 31 will be described with reference to this flowchart. In step S100, it is determined whether or not the tongue plate 8 is inserted into the buckle 9. If it is determined that the tongue plate 8 is inserted, the process proceeds to step S101 and the side portion is determined. When it is determined that the air pressure of the bag bodies 19A, 19B and the central bag body 19C is increased and not inserted, the process proceeds to step S102 and the air pressure of the side bag bodies 19A, 19B and the central bag body 19C is decreased.
After finishing the process of step S101, it progresses to step S103, it is determined whether the pressure of the side bag bodies 19A, 19B and the central bag body 19C has increased to the set value. If not, the process returns to step S101, and the same processing is repeated until the pressure reaches the set value.
After finishing the process of step S102, it progresses to step S104, it is determined whether the pressure of the side bag bodies 19A, 19B and the central bag body 19C has become zero. If not, the process returns to step S102, and the same processing is repeated until the pressure becomes zero.

  As described above, when the occupant m seated on the seat 6 wears the seat belt (the lap belt 4a), the air supply / discharge device 30 operates in conjunction with the wearing of the seat belt. Compressed air is automatically supplied to the bag bodies 19A and 19B and the central bag body 19C until the internal pressure reaches the set pressure.

  When compressed air is supplied to the side bag bodies 19A and 19B in this manner, in the side bag bodies 19A and 19B on both sides, as shown in FIG. 2, bellows-like stretchable walls 21A and 21B extend, and accordingly. The occupant restraint walls 20A and 20B are rotationally displaced toward the outer side of the waist or thigh of the occupant m with the inner end as a fulcrum. Thereby, both the outer side parts of the waist and thighs of the occupant m are restrained by the occupant restraint walls 20A and 20B with the elasticity of the compressed air. At this time, the compressed air is also supplied to the central bag 19C at the same time so that the entire central bag 19C bulges downward, so that the upper surface of the waist and thigh of the occupant m is restrained by the central bag 19C. become.

Here, when the seat belt (lap belt 4a) is attached, the internal pressures (set pressures) of the side bag bodies 19A and 19B and the central bag body 19C controlled by the controller 31 may be always constant. The control value of the internal pressure may be changed as appropriate according to the traveling situation. For example, when the vehicle is running on a road with many corners, it is preferable for the occupant m that the holdability is high. Therefore, in a situation where the internal pressure changes of the side bag bodies 19A and 19B and the central bag body 19C are large, it acts on the vehicle. The control value of the internal pressure may be changed to a value higher than the reference value according to the lateral acceleration or the like. In addition, when traveling on a relatively flat road such as an expressway for a long time, the lower holdability is preferred by the occupant, so the control value of the internal pressure is set to the reference value according to the vehicle speed, lateral acceleration, etc. On the other hand, it may be changed to a low value.
In a situation where the internal pressure changes of the side bag bodies 19A, 19B and the central bag body 19C are small, such as when driving on an expressway, the internal pressure is varied up and down by the control of the controller 31 in the vicinity of the set pressure. It is also possible to have a massage effect on m. Further, an operation switch (not shown) that can change the set value by manual operation by the occupant m may be provided.

  In this seat belt device 1, since the waist and thighs of the occupant m can be elastically restrained from both outer sides by injecting compressed air into the side bag bodies 19A and 19B of the lap belt 4a, The occupant m can be stably restrained to the seat 6 without giving a strong feeling of pressure to the occupant m during driving.

  Further, in the case of the seat belt device 1, since the compressed air is also injected into the central bag 19C of the lap belt 4a, the upper surface side of the occupant m's waist and thigh can be similarly elastically restrained.

  Further, in the seatbelt device 1, the side bag bodies 19A and 19B are configured to include occupant restraint walls 20A and 20B that directly contact the occupant m and bellows-like stretchable walls 21A and 21B. When the compressed air is supplied and discharged, the occupant restraint walls 20A and 20B can always be stably displaced by the bellows-like regular displacement of the telescopic walls 21A and 21B. In particular, in this embodiment, since an annular wire is built in the ridges of the bellows walls 21A and 21B, the bellows-like displacement can be stabilized over a long period of time, and the bellows walls 21A and 21B can be stabilized. The introduced air pressure can always be used for occupant restraint without waste. Therefore, in the seat belt device 1, a stable hold performance for the occupant m can be obtained.

  Furthermore, in the seatbelt device 1 of this embodiment, the occupant restraint walls 20A and 20B have a structure in which the other end is rotated with the occupant center-side end portion as a fulcrum, thereby further improving the holdability for the occupant m. And the gap formed between the lap belt 4a and the occupant m can be efficiently filled.

  In this embodiment, the compressed air is supplied to the side bag bodies 19A and 19B and the central bag body 19C in conjunction with the wearing of the lap belt 4a. Immediate occupant restraint by compressed air can be executed without performing an operation.

  Subsequently, a second embodiment shown in FIGS. 7 to 10 will be described. In addition, the same code | symbol is attached | subjected to the same part as 1st Embodiment, and description shall be partially abbreviate | omitted about the overlapping part.

  As shown in FIG. 7, the seat belt device 101 of this embodiment is a three-point belt having a shoulder belt 4b portion and a lap belt 4a portion, and a bag body for supporting an occupant on the lap belt 4a. The basic configuration such as the point provided with 119A and 119B and the point provided with the air supply / discharge device 30 for supplying and discharging compressed air to and from the bag bodies 119A and 119B are substantially the same as those in the first embodiment. The specific structure of the bag bodies 119A and 119B and the point that one bag body 119B can move on the webbing 4 together with the tongue plate 8 are greatly different from those of the first embodiment.

  The lap belt 4a of the seat belt device 101 of this embodiment includes a pair of bag bodies 119A and 119B on the side facing the waist and thighs of the occupant m at the time of wearing, and the one bag body 119A is a waist part of the occupant m. The other bag body 119B holds the other outer surface of the occupant m and the other outer surface of the thigh (the inner side in the vehicle width direction). From the side facing the top) to the top.

Each of the bags 119A and 119B has plate-like occupant restraint walls 20A and 20B made of a soft member such as urethane that directly contacts the waist and thighs of the occupant m, and is inflated and contracted by injecting and discharging compressed air to restrain the occupant. A pair of bag components 21Aa and 21Ab, 21Ba and 21Bb for displacing the walls 20A and 20B are provided. Each bag constituent portion 21Aa, 21Ab, 21Ba, 21Bb is formed in a substantially fan shape, and the arc angle is changed by expanding and contracting the side wall in a bellows shape. One bag constituent portion 21Aa, 21Ba of each bag body 119A, 119B has a top portion disposed on the side closer to the center of the occupant m on the lap belt 4a when the seat belt is worn, and the other bag constituent portions 21Ab, 21Bb are On the contrary, the top is arranged on the side away from the center of the occupant m. The paired bag constituent portions 21Aa and 21Ab, and 21Ba and 21Bb are joined to each other in a polymerized state in a state where the top portions are disposed in the opposite directions as shown in FIG. One of the bag components 21Aa and 21Ba whose top portion is disposed closer to the center of the occupant m has a larger volume than the other bag components 21Ab and 21Bb, and expands in a fan shape when compressed air is injected, thereby occupant The occupant restraining walls 20A and 20B are brought into contact with the outer side surfaces of the waist and thighs of m from the side. On the other hand, the other bag constituent parts 21Ab and 21Bb abut on the occupant restraint walls 20A and 20B from above with respect to the upper surface of the occupant's waist and thighs by expanding in a fan shape when compressed air is injected. Therefore, by injecting compressed air into the two bag components 21Aa, 21Ba and 21Ab, 21Bb, the occupant restraint walls 20A, 20B are smoothly deformed along the outer shape of the waist and thigh of the occupant m, and the waist and thigh Close contact with the part.
An annular frame (not shown) made of a wire or the like is attached to the ridge portion of the bellows on the side wall of each bag component 21Aa, 21Ab, 21Ba, 21Bb.

  One bag body 119A located on the outer anchor 7 side is fixed to a fixed position of the lap belt 4a, while the other bag body 119B has an annular locking band 25a, 25b with respect to the lap belt 4a. The other bag body 119 </ b> B is further connected to the tongue plate 8 via a connection band 30. Therefore, when the position of the tongue plate 8 is operated according to the physique of the occupant m at the time of wearing the seat belt, the other bag body 119B follows the position operation on the tongue plate 8 and is positioned on the lap belt 4a. Is changed.

  In FIG. 8, 23Aa, 23Ab, 23Ca, and 23Cb indicate compressed air supply / discharge holes for the bag constituent portions 21Aa, 21Ab, 21Ba, and 21Bb of the respective bag bodies 119A and 119B. Although detailed illustration is omitted here, the bag constituent parts 21Ba and 21Bb of the other moving bag body 119B are compressed via a connecting hose having a length capable of following the movement of the bag body 119B. Air is supplied and discharged.

  The seat belt device 101 can be restrained by elastically and continuously enveloping the occupant m from the outer surface to the upper surface by injecting compressed air into the bags 119A and 119B. Therefore, the occupant m can be stably restrained on the seat 6 without giving a strong feeling of pressure to the occupant m during normal operation. In particular, since each bag body 119A, 119B used in this embodiment includes two independent bag components 21Aa and 21Ab, 21Ba and 21Bb for displacing the occupant restraint walls 20A and 20B, the occupant restraint wall 20A. , 20B can be flexibly followed along the body of the occupant m, and the occupant m can be restrained more stably.

  Further, in the seat belt device 101, the bag body 119B on the tongue plate 8 side is held movably on the lap belt 4a, and the bag body 119B and the tongue plate 8 are connected to each other via the connecting band 30 so as to be integrally displaceable. Therefore, when the position of the tongue plate 8 is adjusted when the lap belt 4a is mounted, it is automatically adjusted to the optimum position together with the tongue plate 8. Therefore, even when the occupant m having a different physique is used, the occupant m can always be restrained at the optimum position.

  In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary. For example, the supply and discharge of compressed air to and from the bags 19A, 19B, and 19C may be performed through the buckle 9.

1 is an overall schematic configuration diagram of a seat belt device showing a first embodiment of the present invention. The front view at the time of mounting | wearing of the seatbelt apparatus of the embodiment. The perspective view at the time of accommodation of the seatbelt apparatus of the embodiment. The figure which combined and described the perspective view (A) of the accommodation state of the side part bag body of the same embodiment, and the perspective view (B) of an operation state. The figure which combined and described the perspective view (A) of the accommodation state of the center part bag body of the same embodiment, and the perspective view (B) of an operation state. The flowchart which shows control of the seatbelt apparatus of the embodiment. The whole schematic block diagram of the seatbelt apparatus which shows 2nd Embodiment of this invention. The front view at the time of mounting | wearing of the seatbelt apparatus of the embodiment. The front view at the time of storage of the seatbelt apparatus of the embodiment. The figure which combined and described the perspective view (A) of the accommodation state of the bag body of the embodiment, and the perspective view (B) of an operation state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Seat belt apparatus 4a ... Wrap belt 19A, 19B ... Side part bag body (bag body)
20A, 20B ... Occupant restraint wall 21A, 21B ... Telescopic wall 30 ... Air supply / discharge device (injection means)

Claims (4)

In a seat belt device provided with a lap belt that supports the waist or thigh of an occupant,
A seatbelt device characterized in that a bag body that can be inflated and contracted is provided at a position facing both a waist part or a thigh part of the lap belt occupant and an injection means for injecting gas into the bag body.   The bag body is configured to include an occupant restraint wall that restrains an outer portion of the waist or thigh of the occupant, and a bellows-like stretchable wall that displaces the occupant restraint wall by gas injection and discharge. The seat belt device according to claim 1, wherein   The end portion of the occupant restraint wall near the occupant center in the vehicle width direction is fixed to the lap belt, and the end portion separated from the occupant center side in the vehicle width direction is a free end. 2. The seat belt device according to 2.   The seat belt device according to any one of claims 1 to 3, wherein the injection means injects gas in conjunction with the attachment of the lap belt.

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