JP2017077815A - Seat Belt Device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve protection performance for a crew member.SOLUTION: In a seat belt device, a pretensioner is actuated, a lock mechanism 70 is actuated while an upper body of a crew member is attracted to a seat back of a vehicle seat, a webbing 32 is pushed to a tongue plate 50 to fix and lock the webbing. Accordingly, since the crew member is restrained in the vehicle seat with a proper attitude, protection performance for the crew member is improved.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a seat belt device.

  Patent Document 1 discloses a seat belt device provided with a restraining means for restraining the seat belt when the vehicle is suddenly decelerated or when a collision is predicted. In this prior art, by operating the pretensioner of the lap belt in a state where the seat belt is restrained, the occupant restraint by the lap belt, in particular, the restraint of the occupant waist is enhanced.

  Other related techniques are disclosed in Patent Document 2.

JP 2011-201412 A JP2015-020580A

  In the above prior art, the lap belt pretensioner operates in a state where the seat belt is restrained. For this reason, depending on the posture of the occupant when the seat belt is restrained by the restraining means, it is conceivable that the occupant restraint performance by the lap belt cannot be sufficiently improved and the protection performance of the occupant is not improved.

  In view of the above fact, an object of the present invention is to provide a seat belt device capable of improving the protection performance of an occupant.

  The seat belt device according to claim 1 is operated when a webbing attached to an occupant seated on a vehicle seat, a tongue plate through which the webbing is inserted and detachably attached to a buckle, and a vehicle collision prediction, A pretensioner that increases a tension acting on the webbing; and a fixing unit that operates after the pretensioner is actuated and fixes the webbing against the tongue plate.

  In the first aspect of the present invention, when the pretensioner is operated at the time of vehicle collision prediction, the tension acting on the webbing is increased, and the occupant is attracted to the vehicle seat. Then, the webbing is fixed to the tongue plate in a state where the webbing is pressed against the tongue plate by the fixing means. Therefore, the occupant is restrained by the vehicle seat in an appropriate posture.

  According to the first aspect of the present invention, since the occupant is restrained by the vehicle seat in an appropriate posture, the protection performance of the occupant is improved.

1 is a front view showing a state in which a passenger is restrained by a vehicle seat in the seat belt device according to the first embodiment of the present invention. It is a front view showing typically the internal structure of the buckle and tongue plate of the seatbelt device concerning a first embodiment of the present invention. It is a front view which shows typically the buckle of the seatbelt apparatus which concerns on 2nd embodiment of this invention. It is a block diagram containing the control apparatus which controls a seatbelt apparatus.

<First embodiment>
The seat belt device according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. It should be noted that arrows FR, UP, and OUT appropriately shown in the drawings respectively indicate the vehicle front-rear direction front side, the vehicle vertical direction upper side, and the vehicle width direction outer side of the vehicle to which the seat belt device is applied.

(Construction)
First, the structure of the seat belt device of the present embodiment will be described.

  As shown in FIG. 1, a vehicle seat 12 on which a passenger P is seated and a seat belt device 30 are provided in a passenger compartment 11 of the vehicle 10. The vehicle seat 12 includes a seat cushion 14 on which an occupant P is seated, a seat back 16 that is disposed at a rear end portion of the seat cushion 14 and is tiltably supported by a reclining mechanism, and an upper end portion of the seat back 16. And a headrest 18 that supports the head H of the occupant P.

  The seat belt device 30 of the present embodiment is a so-called three-point seat belt device, and includes a webbing 32, an anchor plate 34, a retractor 36, a shoulder anchor 38, a buckle 40, a tongue plate 50 and a pretensioner 60. .

  The webbing 32 has a belt-like shape, and one end in the longitudinal direction is coupled to the anchor plate 34, and the other end in the longitudinal direction is wound around the retractor 36 so that it can be pulled out.

  In the present embodiment, the anchor plate 34 is fixed to a side portion on the outer side in the vehicle width direction in the rear portion of the seat cushion 14 of the vehicle seat 12.

  The retractor 36 has a function of winding the webbing 32 so that the webbing 32 can be pulled out. In the present embodiment, the retractor 36 is fixed to a lower portion of a center pillar (not shown) outside the seat cushion 14 of the vehicle seat 12 in the vehicle width direction.

  The shoulder anchor 38 is disposed obliquely upward on the vehicle width direction outer side of the seat back 16 of the vehicle seat 12 and on the rear side in the vehicle front-rear direction. The retractor 36 is disposed on the lower side of the shoulder anchor 38 in the rearward direction of the vehicle.

  The buckle 40 is supported on the inner side in the vehicle width direction at the rear portion of the seat cushion 14 via a support plate 42 so that the position in the vehicle front-rear direction can be adjusted. Specifically, the lower end of a sheet metal support plate 42 with a buckle 40 fixed to the upper end side is supported so as to be swingable about an axis along the vehicle width direction, and the support plate 42 swings about the axis. Thus, the position of the buckle 40 in the vehicle front-rear direction according to the physique of the occupant P, the reclining angle of the seat back 16, and the like is adjusted.

  Further, a tongue plate 50 (see also FIG. 2) in which the webbing 32 is inserted into the insertion hole 52 is inserted into and engaged with the buckle 40. The engagement of the tongue plate 50 is released by pressing the release button 44 of the buckle 40. That is, the tongue plate 50 is detachably attached to the buckle 40. The tongue plate 50 is inserted into the buckle 40 and engaged (attached), whereby the webbing 32 is attached to the occupant P seated on the vehicle seat 12.

  In the mounted state of the webbing 32, the webbing 32 having one end coupled to the anchor plate 34 extends inward in the vehicle width direction, and then is folded back by the tongue plate 50 to extend obliquely upward in the vehicle width direction. After being folded back by the shoulder anchor 38 and extending downward in the vertical direction of the vehicle, the other end is taken up by the retractor 36 so that it can be pulled out.

  A portion of the webbing 32 from the shoulder anchor 38 to the tongue plate 50 is a shoulder belt portion 32A, and a portion of the webbing 32 from the tongue plate 50 to the anchor plate 34 is a lap belt portion 32B. That is, the webbing 32 has a shoulder belt portion 32A on one side with respect to the buckle 40 and a lap belt portion 32B on the other side with respect to the buckle 40. If it demonstrates from another viewpoint, the webbing 32 will be divided into the shoulder belt part 32A and the lap belt part 32B by the tongue plate 50. FIG.

  The shoulder belt portion 32A is attached to the upper body (upper body) of the occupant P obliquely from the front to the waist L of the occupant P on the outer side in the vehicle width direction to the waist L on the inner side in the vehicle width direction. Twelve seat backs 16 are restrained. The lap belt portion 32 </ b> B is attached to the lumbar portion L of the occupant P from the front upper side so as to restrain the lumbar portion L to the vehicle seat 12.

  The retractor 36 is provided with a pretensioner 60. The pretensioner 60 is a device that forcibly winds the webbing 32 to increase the tension acting on the webbing, removes slack in the webbing 32, and attracts the occupant P to the vehicle seat 12.

  As shown in FIG. 2, the buckle 40 is provided with a lock mechanism 70 that locks the webbing 32. The lock mechanism 70 includes a slide plate 72 and a drive unit 74 that slides the slide plate 72.

  By this drive unit 74, the slide plate 72 slides as shown by an imaginary line (two-dot chain line) and an arrow M, and is sent out from the delivery hole 46. The distal end portion 72A of the slide plate 72 that has been sent out comes into pressure contact with the webbing 32 that is inserted into the insertion hole 52 of the tongue plate 50 that is engaged with the buckle 40, and the webbing 32 is pressed against the tongue plate 50 and fixed. And lock.

  The driving unit 74 that slides the slide plate 72 may be any mechanism. As an example, as shown in FIG. 2, the shaft portion 71 provided in the slide plate 72 is inserted into a long hole 76 formed in the rotation arm 78, and the rotation arm 78 rotates as indicated by an arrow R, thereby sliding. A mechanism for sliding the plate 72 may be mentioned.

  As shown in FIG. 4, the vehicle 10 includes a control device 80, and the collision prediction sensor 82, the pretensioner 60, and the lock mechanism 70 of the vehicle 10 are electrically connected to the control device 80. Then, when a collision of the vehicle 10 is predicted by a signal from the collision prediction sensor 82, the control device 80 first operates the pretensioner 60, and then operates the lock mechanism 70 after the pretensioner 60 is operated.

  In addition, (170) of FIG. 4 has shown the locking mechanism 170 of 2nd embodiment mentioned later.

  The collision prediction sensor 62 is, for example, a millimeter wave radar, a stereo camera, a vehicle stability control system (VSC) such as an antilock brake system (ABS), a rollover sensor, or the like. Can be used.

  Moreover, although not shown in figure, the airbag which protects the passenger | crew P at the time of a front collision is provided in the vehicle front-back direction front side of the passenger | crew.

(Function and effect)
Next, the operation and effect of this embodiment will be described.

  When a collision of the vehicle 10 is predicted, the pretensioner 60 is activated, the webbing 32 is forcibly taken up, and the tension acting on the webbing 32 (mainly the shoulder belt portion 32A) increases. As a result, the upper body of the passenger P is attracted to the seat back 16 of the vehicle seat 12.

  In this way, the pretensioner 60 is activated and the lock mechanism 70 is activated in a state where the upper body of the occupant P is attracted to the seat back 16 of the vehicle seat 12, and the webbing 32 is fixed and locked to the tongue plate 50.

  Therefore, since the passenger | crew P is restrained by the vehicle seat 12 with a suitable attitude | position, the protection performance of the passenger | crew P improves.

  Further, since the upper body of the occupant P is restrained at an appropriate position by the seat back 16 of the vehicle seat 12, the occupant P is effectively protected by the airbag.

<Second embodiment>
Next, a seat belt device according to a second embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the member same as 1st embodiment, and the overlapping description is abbreviate | omitted.

(Construction)
The seat belt device 130 of the present embodiment shown in FIG. 3 has the same structure as that of the first embodiment except that the lock mechanism 170 is provided on the tongue plate 150.

  A tongue plate 150 having the webbing 32 inserted through the insertion hole 52 is inserted into and engaged with the buckle 140. The buckle 140 has the same structure as the buckle 40 (see FIG. 2) except that the lock mechanism 70 (see FIG. 2) of the first embodiment is not provided.

  The tongue plate 150 is provided with a lock mechanism 170 that locks the webbing 32. The lock mechanism 170 includes a slide plate 172 and a drive unit 174 that slides the slide plate 172.

  The drive unit 174 slides the slide plate 172 as indicated by an imaginary line (two-dot chain line) and an arrow N. The tip 172A of the slid slide plate 172 is pressed against the webbing 32 inserted through the insertion hole 52 of the tongue plate 150 in a state of being engaged with the buckle 140, and the webbing 32 is pressed against the tongue plate 150 and fixed. Lock it.

  The drive unit 174 that slides the slide plate 172 may be any mechanism. As an example, as shown in FIG. 3, shaft-like magnetic portions 176 provided at both ends of the slide plate 172 are inserted into the solenoid 178, and a current is passed through the solenoid 178, so that the slide plate 172 slides. Mechanism.

  When the collision of the vehicle 10 is predicted by a signal from the collision prediction sensor 82, the control device 80 shown in FIG. 4 first operates the pretensioner 60, and then operates the lock mechanism 170 after the pretensioner 60 operates.

(Function and effect)
Next, the operation and effect of this embodiment will be described.

  When a collision of the vehicle 10 is predicted, the pretensioner 60 is activated, and the upper body of the occupant P is attracted to the seat back 16 of the vehicle seat 12. Then, in a state where the pretensioner 60 is activated and the upper body of the occupant P is attracted to the seat back 16 of the vehicle seat 12, the lock mechanism 170 is activated, and the webbing 32 is fixed and locked to the tongue plate 150.

  Therefore, since the passenger | crew P is restrained by the vehicle seat 12 with a suitable attitude | position, the protection performance of the passenger | crew P improves.

  Further, since the upper body of the occupant P is restrained at an appropriate position by the seat back 16 of the vehicle seat 12, the occupant P is effectively protected by the airbag.

<Others>
The present invention is not limited to the above embodiment.

  For example, in the above-described embodiment, the pretensioner 60 is a retractor pretensioner provided in the retractor 36, but is not limited thereto. The wrap outer pretensioner provided in the anchor plate 34 (wrap outer) part may be sufficient, and the buckle pretensioner provided in the buckle 40 may be sufficient.

  Furthermore, it cannot be overemphasized that it can implement with a various aspect in the range which does not deviate from the summary of this invention.

DESCRIPTION OF SYMBOLS 12 Vehicle seat 30 Seat belt apparatus 32 Webbing 40 Buckle 50 Tongue plate 52 Insertion hole 60 Pretensioner 70 Lock mechanism (an example of fixing means)
130 seat belt device 140 buckle 150 tongue plate 170 lock mechanism (an example of fixing means)
P Crew

Claims (1)

A webbing to be worn by an occupant seated in a vehicle seat;
A tongue plate inserted through the webbing and detachably attached to the buckle;
A pretensioner that operates during vehicle collision prediction and increases the tension acting on the webbing;
A fixing means that operates after the operation of the pretensioner and fixes the webbing in a pressed state against the tongue plate;
A seat belt device comprising: