JP2007137240A - Occupant restraint system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an occupant restraint system having a side airbag and an air belt, in which the mechanism is simplified. <P>SOLUTION: The occupant restraint system has the air belt 20 fitted with a lap bag 25, the side air bag 30, and an inflator 31. The gas from the inflator 31 inflates first the side airbag 30, flows into the lap bag 25 via a tube 35, and inflates the lap bag 25. The inflated side airbag 30 restrains the lateral movement of the occupant body and absorbs an impact applied to the occupant body from the cabin side face. Inflation of the lap bag 15 shortens the lap bag 25 to cause a webbing 24 to tighten, and tight attachment to the occupant body is established. As a result, the forward movement of the occupant body is restrained by the webbing 24, and also the impact applied from the webbing 24 to the occupant's waist and/or belly is absorbed by the inflated lap bag 25. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an occupant restraint device for restraining an occupant of a vehicle seat such as an automobile at the time of a collision, and is particularly configured to prevent the occupant's body from moving forward and sideward at the time of a vehicle collision. The present invention relates to an occupant restraint device.

  2. Description of the Related Art A side airbag device that restrains an occupant by inflating a side airbag to the side of the occupant at the time of a vehicle side collision or the like, and an air belt device that inflates an inflatable seat belt at the time of a vehicle collision or the like are well known.

  Japanese Patent Application Laid-Open No. 11-180241 describes an occupant restraint device including both a side airbag device and an air belt device. In the publication, a side airbag device inflator and an air belt device inflator are individually provided.

  As a system for restraining the vehicle occupant at the time of collision, the front part of the seat cushion at the time of vehicle collision is used to prevent the submarine phenomenon that the occupant tries to pass through the lower side of the lap belt even when the seat belt is worn. There has been proposed a device for increasing the height. For example, Japanese Patent Application Laid-Open No. 10-217818 describes a vehicle seat in which the front end portion of the seat cushion is pushed up by a seat bag (airbag) installed on the lower side of the seat cushion.

Japanese Laid-Open Patent Publication No. 2002-145002 discloses an occupant restraint device in which three members, a seat bag in front of a seat cushion, a shoulder belt, and a lap belt are inflated to restrain an occupant. Japanese Patent Laid-Open No. 2002-145002 shows a configuration in which the seat bag at the front portion of the seat cushion, the shoulder belt, and the lap belt are inflated by one gas generator.
JP-A-11-180241 JP-A-10-217818 JP 2002-145002 A

  As described above, the occupant restraint device disclosed in JP-A-11-180241 has a complicated structure because the side airbag inflator and the air belt inflator are separately provided.

  An object of the present invention is to simplify a mechanism in an occupant restraint device having a side airbag and an air belt.

  The occupant restraint device according to claim 1 is configured to inflate the side airbag and the air belt with a common inflator, and gas from the inflator is introduced into the air belt via the side airbag. It is comprised so that it may be comprised.

  The occupant restraint device according to claim 2 is characterized in that, in claim 1, a flow restriction member or a check valve is provided in a gas flow path from the side airbag toward the air belt.

  The occupant restraint device according to claim 3 is characterized in that, in claim 1 or 2, a seat bag that is inflated by gas from the inflator is installed below the seat cushion.

  An occupant restraint device according to a fourth aspect is characterized in that the gas from the inflator is introduced into the seat bag via the side air bag or the air belt in the third aspect. is there.

  In the occupant restraint device of the present invention, since the side airbag and the air belt are inflated by a common inflator, the number of inflators is small. Further, since the gas from the inflator is introduced into the air belt via the side airbag, the configuration of the gas supply path from the inflator is simplified.

  When a flow restriction member (for example, an orifice) is provided in the gas flow path from the side airbag toward the air belt, the amount of gas supplied from the side airbag to the air belt can be easily adjusted.

  Further, when a check valve is provided in the gas flow path, the internal pressure of the air belt can be kept high for a long time.

  In the present invention, a seat bag may be installed under the seat cushion, and the side airbag, the air belt, and the seat bag may be inflated by a common inflator.

  In this case, the gas may be directly supplied from the inflator to the seat bag, or the gas may be supplied to the seat bag via a side airbag or an air belt.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 and FIG. 2 (a) are perspective views of a seat provided with an occupant restraint device according to the embodiment, and FIG. 2 (a) is a front view thereof. FIG. 2 shows a state where the side airbag and the air belt are inflated. FIG. 3 is an internal perspective view of the inflated side airbag.

  An automobile seat 1 includes a seat frame 2, a seat cushion 3 mounted on the seat frame 2, a seat back 4 erected so as to be reclining from the rear portion of the seat cushion 3, It consists of a headrest 5 attached to the upper part. A buckle device 22 to which a tongue 21 of the air belt 20 is detachably connected is provided on a side surface of the seat frame 2 on the center side of the passenger compartment. Further, a lap anchor 23 attached to the front end portion of the air belt 20 is fastened to the side surface of the seat frame 2 on the side of the passenger compartment (such as a door).

  The air belt 20 includes a webbing 24 that is passed through a tongue 21 and a lap bag 25 to which one end of the webbing 24 is connected. A lap anchor 23 is attached to the tip of the wrap bag 25. The other end of the webbing 24 is passed through a shoulder anchor (not shown) provided on the B-pillar, and then connected to a seat belt retractor (not shown) so as to be wound.

  Although not shown, the wrap bag 25 includes a bag main body and a cylindrical cover that covers the bag main body. The bag body is in an elongated and flat folded state at normal times. The cover is sized to fit the outer periphery of the folded body of the bag body when the bag body is in an inflated state, but when the bag body is inflated, it extends in the circumferential direction to allow the bag body to expand. It is configured to

  In this embodiment, the cover is formed of a knitted fabric that freely extends in the circumferential direction but hardly extends in the longitudinal direction. Therefore, when the bag body expands, the cover stitches expand in the circumferential direction as the cover extends in the circumferential direction, and as a result, the length of the cover in the longitudinal direction decreases. As a result, the webbing 24 is tightened and comes into close contact with the passenger body.

  The occupant restraint device inflates the airbag 20, the side airbag 30 that is inflated to the side of the occupant seated on the seat 1, that is, between the occupant and the side of the passenger compartment, and the airbag 20 and the side airbag 30. An inflator (gas generator) 31 is provided.

  The side airbag 30 is accommodated in a folded state in a case (not shown) arranged on the side surface side of the seat back frame (not shown) in normal times. The case is configured to be opened when the side airbag 30 is inflated to allow the side airbag 30 to be inflated.

  In this embodiment, the inflator 31 is disposed in the side airbag 30. As shown in FIG. 3, the inflator 31 is held by a holder 32, and the holder 32 is fastened to the seat back frame via bolts 33. Thereby, the side airbag 30 and the case are also fastened to the seat back frame. A wiring (not shown) to the initiator (ignition device) of the inflator 31 is pulled out of the side airbag 30 and connected to an inflator control circuit (not shown).

  One end of a flexible tube 35 is connected to the gas outlet 34 at the lower part of the side airbag 30, and the other end of the tube 35 is connected to the lap bag 25.

  Although not shown, a vehicle equipped with this occupant restraint device is provided with various sensors for detecting that the vehicle has collided (including a side collision) or rollover. The inflator control circuit activates the initiator of the inflator 31 based on detection signals from these sensors.

  When a vehicle equipped with an occupant restraint device configured in this way encounters an emergency such as a collision or rollover, the sensor detects this, and an activation signal is input from the inflator control circuit to the initiator of the inflator 31. The initiator is activated and gas is ejected from the inflator 31. The gas from the inflator 31 first inflates the side airbag 30 and then flows into the lap bag 25 through the tube 35 to inflate the lap bag 25.

  The inflated side airbag 30 restrains the movement of the occupant body in the lateral direction and absorbs the impact applied to the occupant body from the side of the passenger compartment. Further, when the lap bag 25 is inflated, the length of the lap bag 25 is shortened, and the webbing 24 is tightened to come into close contact with the occupant's body. As a result, the front movement of the occupant body is restrained by the webbing 24, and the inflated lap bag 25 absorbs the impact applied from the webbing 24 to the waist or abdomen of the occupant.

  In this occupant restraint device, as described above, since the lap bag 25 and the side airbag 30 of the air belt 20 are inflated by the common inflator 31, one inflator is sufficient, and the configuration is It is simple.

  In particular, in this embodiment, the inflatable portion 23 (bag body) of the air belt 20 and the side airbag 30 are in communication with each other, and the gas from the inflator 31 passes through the side airbag 30 and the tube 35 to wrap the bag. Therefore, the configuration of the gas supply path from the inflator 31 is also very simple. Further, the space for gas branching and piping is not necessary or less, and the degree of freedom in designing the seat increases.

  Each of the above embodiments shows an example of the present invention, and the present invention is not limited to each of the above embodiments.

  For example, in the above embodiment, the inflator 31 is disposed in the side airbag 30. However, the inflator 31 is disposed outside the side airbag 30, and the gas outlet of the inflator 31 is directly or via a duct or the like. You may connect to a gas introduction part.

  In the present invention, a flow restricting member (for example, an orifice) may be provided in the gas flow path from the side airbag toward the air belt. When configured in this manner, the amount of gas supplied from the side airbag to the air belt can be easily adjusted.

  Alternatively, a check valve may be provided in the gas flow path. In such a configuration, the internal pressure of the air belt can be kept high for a long time.

  In the present invention, when a seat bag device is also installed in addition to the side airbag and the air belt, the side airbag, the air belt, and the seat bag may be inflated with a common inflator.

It is a perspective view of the sheet | seat provided with the passenger | crew restraint apparatus which concerns on embodiment. It is the perspective view and front view of a sheet | seat provided with the passenger | crew restraint apparatus which concerns on embodiment. It is an internal see-through | perspective perspective view of a side airbag.

Explanation of symbols

1 seat 2 seat frame 3 seat cushion 20 air belt 24 webbing 25 lap bag 30 side airbag 31 inflator 35 tube

Claims (4)

  An occupant restraint device configured to inflate a side airbag and an air belt with a common inflator, wherein the gas from the inflator is configured to be introduced into the air belt via the side airbag. An occupant restraint system.   The occupant restraint device according to claim 1, wherein a flow restricting member or a check valve is provided in a gas flow path from the side airbag toward the air belt.   The occupant restraint apparatus according to claim 1 or 2, wherein a seat bag that is inflated by gas from the inflator is installed below the seat cushion.   4. An occupant restraint apparatus according to claim 3, wherein gas from the inflator is introduced into the seat bag via the side airbag or the air belt.

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