JP3748693B2 - Air belt device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air belt device that inflates a seat belt that restrains an occupant to a seat in a vehicle collision with a high-pressure gas supplied from an inflator.
[0002]
[Prior art]
An air belt device that stores a bag in a seat belt and inflates the bag to restrain a passenger softly in the event of a vehicle collision is already known from, for example, Japanese Patent Laid-Open No. 6-560001.
[0003]
[Problems to be solved by the invention]
In order to compensate for changes in the angle of the belt depending on the front and rear position of the seat and the occupant's body shape when the seat belt device is mounted, the buckle device to which the tongue device provided on the belt is coupled can swing back and forth on the seat base Also in the air belt device, it is necessary to pivot the buckle device so that it can swing back and forth for the same reason.
[0004]
FIG. 7 shows a main part of a conventional air belt device. A buckle device 04 to which a tongue device 03 provided at the ends of a shoulder belt 01 and a lap belt 02 is coupled is connected to a seat base 05 via a fulcrum pin 06. It is pivotally supported so that it can swing back and forth. The high pressure gas generated by the inflator 07 provided integrally with the buckle device 04 at the time of the collision of the vehicle passes through the inside of the buckle device 04 and the tongue device 03 and is supplied to the shoulder belt 01 to expand the shoulder belt 01. Restrain the passengers softly. In such a conventional air belt device, since the inflator 07 is integrally provided in the buckle device 04, when the buckle device 04 swings around the fulcrum pin 06, the inflator 07 also swings integrally. There is a problem that design restrictions occur in order to avoid interference with members.
[0005]
The present invention has been made in view of the above circumstances, and an object of the present invention is to allow the buckle device to swing while avoiding interference between the inflator and other members in the air belt device.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the invention described in claim 1 is a belt in which an inflatable bag is housed and one end is supported by a fixed portion, and a tongue device provided at the other end of the belt. And a buckle device that is supported by a fixed portion to which the tongue device is coupled, and an inflator that generates high-pressure gas, and the high-pressure gas generated by the inflator at the time of a vehicle collision passes through the buckle device and the tongue device. In the air belt device for inflating the bag by supplying to the buckle device, the buckle device has an inflator integrated with the buckle base fixed to the fixed portion, and is pivotally supported by the buckle base so as to be swingable back and forth. And a buckle body portion to which the tongue device is coupled.
[0007]
According to the above configuration, when the occupant sits on the seat and joins the tongue device to the buckle device, even if the angle of the belt changes depending on the front / rear position of the seat or the occupant's body shape, the buckle body portion of the buckle device is attached to the buckle base portion. The belt can be swung to absorb the change in the angle of the belt. In addition, since the inflator provided integrally with the buckle base fixed to the fixing portion does not swing, the inflator does not need to interfere with other members. The high-pressure gas generated by the inflator at the time of vehicle collision can pass through the inside of the buckle base and the buckle body of the buckle device and inflate the bag without any trouble.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.
[0009]
1 to 6 show an embodiment of the present invention. FIG. 1 is a side view of a front seat portion of a vehicle, FIG. 2 is a view in the direction of the arrow in FIG. 1, and FIG. 4 is an enlarged sectional view taken along line 4-4 in FIG. 3, FIG. 5 is a sectional view taken along line 5-5 in FIG. 4, and FIG. 6 is a sectional view taken along line 6-6 in FIG.
[0010]
As shown in FIGS. 1 to 3, an air belt device for restraining an occupant (driver in the embodiment) to a front right seat 1 includes a shoulder belt retractor 3 provided at a lower portion of a center pillar 2, and the shoulder belt A lap belt retractor 4 provided on the lower side of the retractor 3, a shoulder belt 6 drawn from the shoulder belt retractor 3 and extending via a slip guide 5 provided on the upper part of the center pillar 2, and a lap belt retractor 4, a lap belt 7 pulled out from 4, a tongue device 8 fixed to the shoulder belt 6 and an end of the lap belt 7, and a seat base 10 formed of a seat frame or a slide rail, and the tongue device 8 is coupled. Buckle device 9 and inflator connected to buckle device 9 Equipped with a 1 and.
[0011]
The known shoulder belt retractor 3 and lap belt retractor 4 wind up the shoulder belt 6 and the lap belt 7 so that they can be pulled out, respectively, and in a normal time when an acceleration sensor (not shown) does not detect an acceleration exceeding a predetermined value. The belts 6 and 7 can be pulled out to allow the occupant to move, and when the acceleration sensor detects an acceleration exceeding a predetermined value during a vehicle collision, the belts 6 and 7 are locked so that they cannot be pulled out. The passenger is restrained. The known inflator 11 is ignited when the acceleration sensor detects an acceleration equal to or higher than a predetermined value, and generates high-pressure gas due to combustion of the propellant.
[0012]
The lap belt 7 is composed of a plain belt of ordinary synthetic fibers. On the other hand, the portion of the shoulder belt 6 that contacts the chest of the occupant is composed of a rubber bag 12 formed in a cylindrical shape and a cover 13 that covers the outside as shown in FIG. The cover 13 made of circular knitted knit has the property of being easily stretchable in the radial direction and difficult to stretch in the longitudinal direction. The bag 12 and the cover 13 are normally flat band-like, but when high-pressure gas is supplied from the inflator 11 to the bag 12, the bag 12 and the cover 13 are inflated to the state shown in FIGS.
[0013]
As shown in FIGS. 3 to 6, the buckle device 9 includes a buckle base portion 14 and a buckle body portion 15. The buckle base portion 14 is a hollow member having a circular shape when viewed from the side, and is fixed to the side surface of the seat base 10 with three bolts 17 penetrating three mounting flanges 16 provided on the outer periphery thereof. An opening 18 extending in the circumferential direction is formed on the upper surface of the buckle base 14, and a tubular inflator connecting portion 19 is integrally formed on the front surface. The inflator 11 is coupled to the inflator connecting portion 19 of the buckle base portion 14, and the two attachment bands 20, 20 fitted to the outer periphery of the inflator 11 are respectively connected to the side surface of the seat base 10 with two bolts 21, 21. Fixed to.
[0014]
The buckle body 15 includes a connecting pipe 22 having a square section extending downward, and an arcuate sliding plate 23 formed integrally with the lower end of the connecting pipe 22. The connecting pipe 22 passes through the opening 18 of the buckle base portion 14, and the upper surface of the sliding plate 23 accommodated in the buckle base portion 14 abuts slidably on the inner peripheral surface of the buckle base portion 14. In order to maintain the contact state between the upper surface of the sliding plate 23 and the inner peripheral surface of the buckle base portion 14, two guide members 24 and 24 that are in contact with the lower surface of the sliding plate 23 are formed integrally with the buckle base portion 14. The Further, the seal member 25 fitted and supported in the support groove formed on the outer periphery of the upper surface of the sliding plate 23 comes into airtight contact with the inner peripheral surface of the buckle base portion 14, and the gap between the buckle base portion 14 and the sliding plate 23 is removed. Prevent leakage of high pressure gas.
[0015]
A buckle 26 is fixed to the upper portion of the buckle body portion 15. Further, the connection port 27 that opens in the upper wall of the buckle body portion 15 and the connection pipe 22 communicate with each other through a gas passage 28 formed inside the buckle body portion 15.
[0016]
The bag 12 and the cover 13 of the shoulder belt 6 fitted to the upper outer peripheral surface of the tongue main body 31 of the tongue device 8 and the lap belt 7 superimposed on the outside thereof are fastened and fixed by an annular holder 32. . A tongue 33 having an upper half embedded in the tongue main body 31 is fixed to the tongue main body 31 with a bolt 34 penetrating the holder 32, the lap belt 7, the cover 13 and the bag 12. A connecting tube 35 that can be inserted into the connection port 27 of the buckle body 15 is protruded from the lower surface of the tongue body 31. A gas passage 36 that allows the connection port 27 to communicate with the interior of the bag 12 is formed inside the buckle body 15 and the connection pipe 35. A release button 37 for separating the tongue 33 coupled to the buckle 26 is provided on the buckle body 15.
[0017]
Next, the operation of the embodiment of the present invention having the above-described configuration will be described.
[0018]
As shown in FIG. 4, when the tongue 33 of the tongue device 8 is coupled to the buckle 26 of the buckle device 9 in order to mount the air belt device 3, the connection pipe 35 of the tongue device 8 is fitted into the connection port 27 of the buckle device 9. . When the angles of the shoulder belt 6 and the lap belt 7 change depending on the front and rear positions of the seat 1 and the body shape of the occupant, the tongue device 8 connected to the shoulder belt 6 and the lap belt 7 together with the buckle body portion 15 of the buckle device 9 is shown in FIG. The angle change is compensated for by swinging in the direction of arrow AB. That is, when the buckle body 15 swings in the direction of the arrow AB, the sliding plate 23 provided at the lower end of the buckle body 15 slides in a state where the seal member 25 is in contact with the inner peripheral surface of the buckle base 14. Thus, the buckle body 15 can rotate relative to the buckle base 14.
[0019]
Thus, when the acceleration sensor detects an acceleration of a predetermined value or more during a vehicle collision, the inflator 11 is ignited by an ignition command from the ignition control device to generate high-pressure gas, and the high-pressure gas is in the internal space of the buckle base 14. Then, it is supplied into the bag 12 of the shoulder belt 6 through the connecting pipe 22 and the gas passage 28 of the buckle main body portion 15 and the connection pipe 35 and the gas passage 36 of the tongue main body portion 31. As a result, when the shoulder belt 6 is inflated, the contact area with the chest of the occupant increases as compared to the shoulder belt 6 before being inflated, so that the occupant can be restrained more softly. The tension acting on the shoulder belt 6 and the lap belt 7 is transmitted from the tongue device 8 to the seat base 10 through the buckle body portion 15 and the buckle base portion 14 of the buckle device 9.
[0020]
As described above, even if the buckle body portion 15 of the buckle device 9 swings, the inflator 11 is fixed to the seat base 10 so as not to swing, so that there is no possibility that the inflator 11 interferes with other members. Design freedom is improved.
[0021]
As mentioned above, although the Example of this invention was explained in full detail, this invention can perform a various design change in the range which does not deviate from the summary.
[0022]
For example, the center pillar 2 is illustrated as a fixed portion to which one end of the shoulder belt 6 is connected, and the seat base 10 is illustrated as a fixed portion to which the buckle device 9 and the inflator 11 are supported. It is not limited.
[0023]
【The invention's effect】
As described above, according to the first aspect of the present invention, when the occupant sits on the seat and joins the tongue device to the buckle device, even if the angle of the belt changes depending on the front / rear position of the seat or the occupant's body shape, The buckle body portion of the buckle device can swing with respect to the buckle base portion to absorb the belt angle change. In addition, since the inflator provided integrally with the buckle base fixed to the fixing portion does not swing, the inflator does not need to interfere with other members. The high-pressure gas generated by the inflator at the time of vehicle collision can pass through the inside of the buckle base and the buckle body of the buckle device and inflate the bag without any trouble.
[Brief description of the drawings]
FIG. 1 is a side view of a front seat portion of a vehicle. FIG. 2 is a view taken in the direction of the arrow in FIG. 1. FIG. 3 is a perspective view of essential parts of an air belt device. 5 is a sectional view taken along line 5-5 in FIG. 4. FIG. 6 is a sectional view taken along line 6-6 in FIG. 4. FIG. 7 is an enlarged view of a main part of a conventional air belt device.
2 Center pillar (fixed part)
6 Shoulder belt (belt)
8 Tongue device 9 Buckle device 10 Seat base (fixed part)
11 Inflator 12 Bag 14 Buckle Base 15 Buckle Body

Claims (1)

A belt (6) in which an inflatable bag (12) is housed and one end is supported by a fixing part (2);
A tongue device (8) provided at the other end of the belt (6);
A buckle device (9) to which the tongue device (8) is coupled, supported by a fixing portion (10);
An inflator (11) for generating high-pressure gas;
An inflatable belt for inflating the bag (12) by supplying the high pressure gas generated by the inflator (11) to the bag (12) through the buckle device (9) and the tongue device (8). In the device
The buckle device (9) has an inflator (11) integrally and a buckle base (14) fixed to the fixing part (10), and is pivotally supported by the buckle base (14) so as to be swingable back and forth. An inflatable belt device comprising a buckle body (15) to which the tongue device (8) is coupled.

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