JP6238002B2 - Vehicle seat belt device - Google Patents

Description

  The present invention relates to a seat belt device for a vehicle in which a retractor device is provided on a door.

Some pickup trucks are equipped with a side-opening door that opens and closes from the center with two doors, that is, a so-called double door.
Since a vehicle having a double door is generally not provided with a center pillar at the entrance, a seat belt device for restraining an occupant seated on the front seat is built in the rear door. Specifically, like a three-point seat belt device disclosed in Patent Document 1, a retractor device has a structure in which a retractor that accommodates a seat belt is attached to a frame attached to a door. Then, the retractor device is provided on the door, the front end portion of the seat belt pulled out from the retractor is fixed to the anchor portion provided at the lower portion of the door, and the tongue is provided at the boundary between the lap belt portion and the shoulder belt portion. In other words, when the seat belt is pulled out from the retractor and the tongue is inserted and connected to the buckle beside the front seat, the lap belt part straddles the occupant's waist, the shoulder belt part straddles the occupant's shoulder, and restrains the occupant to the front seat .

By the way, recently, in a seat belt device, as in Patent Document 2, in order to further improve safety, a retractor is equipped with a pretensioner.
The pretensioner has a function of pulling the seat belt pulled out from the retractor and restraining the occupant sitting on the seat when an impact force of a predetermined level or more is applied. Specifically, a pretensioner generally has a tube member that has a gas generating agent such as explosives and an igniter, and in which many balls serving as relay members are movably housed. One end of the tube member is connected to the retractor of the seat belt device, and the ball is displaced by the generation of gas, so that the spool around which the seat belt is wound is rotationally displaced in the take-up direction and pulled out from the retractor. The seat belt is retracted.

JP 2011-16531 A JP 2010-69900 A

The tube member of the pretensioner equipped in the retractor is prohibited from being installed so as to deform the tube member so that the ball can move smoothly inside. For this reason, the tube member of the pretensioner employs a one-side support structure in which only one end portion is supported and the other end portion is extended around.
By the way, when a retractor equipped with a pretensioner is disposed on the door, an excessive impact force is easily applied to the tube member of the pretensioner when the door is opened and closed, unlike when a retractor equipped with a pretensioner is disposed on the vehicle body. Particularly in the case of a kannon door, since the pretensioner is disposed close to the free end of the door together with the retractor, an excessive impact force is likely to be applied.

  However, the tube member of the pretensioner equipped on the retractor is a component that is supported only at one end, so when an impact force is applied, the other end of the tube member swings excessively in the door opening / closing direction, There is a risk of damaging the tube member by causing excessive stress to the part. For this reason, it was considered difficult to adopt the pretensioner door equipped on the retractor.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vehicle seat belt device in which excessive swinging of a tube member of a pretensioner installed in a retractor can be suppressed.

The aspect according to the first aspect of the present invention includes a door that opens and closes an entrance / exit formed in the vehicle body, and a retractor device provided on the door, and the retractor device includes a frame attached to the door; There is a retractor that can be pulled out of the seat belt that is assembled to the frame, and a pretensioner that pulls in the seat belt that is pulled out of the retractor when an impact force greater than a predetermined level is applied to the vehicle body. One end of the pretensioner is attached to the retractor. It has a tube member that is connected and has the other end extending to the periphery and capable of generating a pull-in force that pulls in the seat belt. Between the retractor and the other end of the tube member, the tube member does not swing in the door opening / closing direction. shake have a suppressing portion suppresses shake suppressing portion includes a base portion which is fixed to the retractor, a pair extending toward the base portion to the other end of the tube member and a clamping portion For example, clamping portion is intended to elastically nip the other end of the tube member.

The aspect which concerns on the invention of Claim 2 has the gas generation part which operates a pretensioner in the other end part of a tube member, and a clamping part is in the opening-and-closing direction of a door by clamping a gas generation part. The vibration of the tube member was suppressed .

According to invention of Claim 1 and Claim 2 , the tube member of the pretensioner with which a retractor is equipped can suppress the excessive shake | fluctuation of a door opening / closing direction by a shake suppression part.
Therefore, even if an excessive impact force is applied to the tube member that is supported on one side when the door is opened and closed, the tube member does not generate an excessive stress, and is used for the door of a retractor with a pretensioner. Can be realized.

The perspective view which shows the vehicle which has the double doors type | formula door which becomes the aspect which concerns on one Embodiment of this invention. The front view which shows the seatbelt apparatus with which the inner surface of the rear door is equipped. The perspective view which expands and shows the retractor apparatus in FIG. The perspective view of a retractor apparatus when it sees from the arrow A in FIG. The disassembled perspective view which shows the structure of a shake suppression part. Sectional drawing of the shake suppression part which follows the BB line in FIG.

Hereinafter, the present invention will be described based on an embodiment shown in FIGS.
FIG. 1 shows a vehicle to which the present invention is applied, for example, a pickup truck.
The outline of the truck will be described. In FIG. The vehicle body 1 has a cabin 3 at the front and a loading platform 5 at the rear. A front seat 7 and a rear seat 9 are installed on the floor 3 a of the cabin 3. Incidentally, both the front seat 7 and the rear seat 9 are configured to have a seat cushion 8a and a seat back 8b.

  On the side of the cabin 3 in the vehicle width direction, there is formed an entrance 11 that opens from the front seat 7 to a point where the rear seat 9 is located. Incidentally, there is no center pillar at the entrance 11. The entrance 11 is provided with a front door 13 for an occupant seated on the front seat 7 and a rear door 15 for an occupant seated on the rear seat 9. Among these, the front part of the front door 13 is rotatably supported by the front part of the entrance 11 via a hinge (not shown). Thereby, the front door 13 is opened and closed from the rear side. The rear portion of the rear door 15 is rotatably supported by the rear portion of the entrance 11 through a hinge (not shown). Thereby, the rear door 15 is opened and closed from the front side. That is, the two doors 13 and 15 serve as a kannon door that opens and closes from the center.

Each of the front door 13 and the rear door 15 includes a door main body 13c, 15c configured by combining the door outer panel 13a, 15a and the door inner panel 13b, 15b, and a door window 13d provided on an upper portion of the door main body 13c, 15c, 15d and door trims 13e and 15e provided to cover the inner surfaces of the door inner panels 13b and 15b.
The rear door 15 incorporates an occupant seat belt device seated on the front seat 7, for example, a three-point seat belt device 21. Although not shown, a seat-balt device for an occupant seated on the rear seat 9 is provided in the rear pillar 1a.

FIG. 2 shows the seat belt device 21 for the front seat. FIG. 2 shows a state in which the front surface of the rear door 15, more specifically, the door trim 15e is removed and the panel surface of the door inner panel 15b is exposed.
The structure of each part of the seat belt device 21 will be described with reference to FIG. 2. Reference numeral 25 denotes a retractor device installed on the door inner panel portion located at the lower front part of the door inner panel 15 b, and 27 denotes the retractor device 25. An inner handle structure (for example, an inner handle 27a and a lever mechanism 27b for transmitting the handle displacement to the door lock) installed on the door inner panel portion located at the upper stage, 30 is located at the upper front part of the door inner panel 15b. A belt guide suspended from the door inner panel portion via an adjuster mechanism 30a (for example, a slide structure using a guide rail) is shown.

FIG. 3 shows an enlarged perspective view of the retractor device 25 among them. FIG. 4 is a perspective view showing the appearance of the retractor device 25 as seen from the direction of arrow A in FIG.
The retractor device 25 will be described. The retractor device 25 includes a combination of components such as a frame 70, a retractor 80, and a pretensioner 90.

  To explain each component, for example, the frame 70 extends in the vertical direction in a band shape, and a door mounting frame portion 71 (hereinafter simply referred to as a frame portion 71) formed of a plate member whose upper portion is bent in an L shape, And a frame-shaped main frame portion 72 assembled to one side surface of the frame portion 71. A belt guide port 73 is provided in a plate portion of the upper portion of the frame portion 71 that protrudes in an L shape toward the main frame portion 72, and an upper stay 74 is provided at the uppermost portion of the frame portion 71. Is provided with a mounting hole 74a (FIG. 4). A lower stay 75 is provided at the lowermost portion of the frame portion 71, and a mounting hole 75 a is provided in the lower stay 75. The upper stay 74 is disposed on the panel portion 16 raised from the door inner panel 15 b with the main frame portion 72 facing the door inner panel 15 b, and is bolted by a bolt member 78. Similarly, the lower stay 75 is fixed to the panel portion 16 by a bolt member 78.

  As shown in FIGS. 3 and 4, the retractor 80 includes a spool unit 81 assembled in the main frame portion 72 and a rewind unit 82 assembled on one side wall 72 a of the main frame portion 72. . The spool unit 81 includes a spool 35 around which the seat belt 33 is wound. The unwinding unit 82 is configured by housing various devices such as a winding spring mechanism 82b for unwinding the seat belt 33 in a short cylindrical casing 82a made of synthetic resin, for example. The rewind unit 82 and the spool 35 are connected to each other so that the seat belt 33 can be pulled out from the upper part of the retractor 80.

  The leading end of the seat belt 33 pulled out from the retractor 80 passes through the belt guide port 73, the gap between the inner handle structure 27 and the door inner panel portion, as shown in FIG. A lap pretensioner 39 is connected to an anchor portion 32 provided on the lower side of the rear door 15. Of the pulled-out seat belt 33, a tongue 41 is assembled at the boundary between the lap belt portion 33a and the shoulder belt portion 33b. Thus, while pulling out the seat belt 33 from the retractor 80, the tongue 41 is disposed on the side portion of the seat cushion 8a of the front seat 7, specifically on the cushion side portion on the opposite side to the entrance 11 (see FIG. 1), the lap belt portion 33a is disposed so as to straddle the waist of the occupant seated on the front seat 7, and the shoulder belt portion 33b is disposed so as to straddle the shoulder of the occupant. Restrain an occupant seated in

The pretensioner is assembled to the retractor 80 using the space between the upper part of the retractor 80 and the belt guide port 73 as shown in FIGS. 3 and 4. The pretensioner 90 is an inflator type device that forcibly displaces the spool 35 in the entrainment direction when a predetermined impact force is applied.
For example, as shown in FIG. 4, the pretensioner 90 is formed of, for example, a metal tube, and a large number of balls 91 (relay members) are slidably accommodated therein, and a notch 92 a that forms a ball outlet is formed at one end. The formed elongated tube member 92, a gas generating part 94a (constituted by a gas generating agent such as explosive) housed in the other end of the tube member 92, an ignition part 94 for igniting the gas generating agent, and gas generation It has a piston portion (not shown) interposed between the portion 94a and the ball row end.

  Here, the tube member 92 is bent in an L shape with one end side having the notch portion 92a from the upper side to the lower side, and the subsequent tube portion is bent in a C shape. Among these, the one end side of the tube member 92 is along the outer surface of the other side wall 72b on the opposite side of the main frame portion 72 to the rewinding unit 82 sandwiching the main frame portion 72. More specifically, one end side of the tube member 92 is arranged along the vertical direction on the frame part 71 side, and the notch part 92a is arranged toward the center side of the other side wall 72b. The end portion having the cutout portion 92a is connected to the spool 35 via a conversion mechanism portion 93 installed on the entire outer surface of the other side wall 72b. Incidentally, the end portion of the tube member 92 and the conversion mechanism portion 93 are fixed by a bracket 93x.

  The conversion mechanism 93 transmits, for example, the rotational displacement of the ring gear 93a (shown schematically by a one-dot chain line in FIG. 4) that forms a ball path along the rotational direction of the spool 35 to the spool 35. It has a pinion gear 93b (shown schematically by a one-dot chain line in FIG. 4). The other end side of the remaining tube member 92 is disposed immediately above the main frame portion 72. For example, the other end side of the tube member 92 is disposed in the periphery so as to extend along the other side wall 72 b and the end wall 72 c of the main frame portion 72 and further directly over the rewind unit 82. That is, the entire other end side of the tube member 92 is disposed above the retractor 80.

  The pretensioner 90 generates a gas inside the tube member 92 when a predetermined impact force is applied to the vehicle body 1 due to a collision or the like, and the gas 91 is displaced by the gas generation via a piston portion (not shown). . The ball 91 moves to the ball path of the conversion mechanism 93 through the notch 92a, and the spool 35 is displaced in the winding direction via the ring gear 93a and the pinion gear 93b. That is, the displacement of the ball 91 is transmitted to the spool 35 as a pulling force, and the pulled-out seat belt 33 is pulled. As a result, when an impact force of a predetermined level or more is applied to the vehicle body 1, the occupant seated on the front seat 7 is pressed against the front seat 7 by the seat belt 33 by the pretensioner 90.

As shown in FIGS. 3 and 4, the tube member 92 is provided with a shake suppression structure 60 (corresponding to the shake suppression portion of the present application).
That is, the pretensioner 90 receives an impact force from the door opening / closing direction when the rear door 15 is opened / closed. In particular, the tube member 92 is a one-sided support that supports only the side from which the ball 91 is led out and the other end side is easy to swing. Therefore, depending on the opening / closing operation of the rear door 15, an excessive impact force is applied to the tube member 92. However, there is a risk of excessive swinging in the door opening / closing direction with the one end side as a fulcrum.

Therefore, a vibration suppressing structure 60 that suppresses the vibration of the tube member 92 is provided on the free end side (the other end side) of the tube member 92 of the present embodiment. For example, a structure as shown in FIGS. 5 and 6 is used for the shake suppressing structure 60.
For the same structure, for example, a structure in which a clip portion 61 is provided on the upper outer peripheral surface of the casing 82a of the rewind unit 82 through which the other end portion of the tube member 92 passes is used.

  Specifically, for example, the clip portion 61 uses a clip member 62 (corresponding to the holding member of the present application) whose base portion is integrally fixed to the casing 82a and whose tip portion protrudes toward the other end portion of the tube member 92. . The clip member 62 is formed with a pair of clamping portions 63 that elastically clamp the tube member 92 from both sides in the diameter direction at the distal end portion. A pair of claw portions 64 that sandwich the tube member 92 from the base portion of the clip member 62, that is, from both sides in the vertical direction, are provided on the inner surface of the distal end portion of the clamping portion 63. A holding portion 65 capable of holding the tube member 92 from the outside is formed from the C-shaped portion formed by the pair of claw portions 64, the pair of clamping portions 63, and the base portion of the clip member 62.

The holding portion 65 holds the tube portion on the other end side of the tube member 92.
Thus, by providing the vibration suppressing structure 60 between the casing 82a (retractor 80) and the tube member 92, the vibration of the tube member 92 of the pretensioner 90 is suppressed.
Therefore, when the rear door 15 is opened and closed, even if an excessive impact force is generated in the door opening and closing direction, the shake suppressing structure 60 can suppress an excessive shake on the free end side (the other end side) of the tube member 92. . As a result, damage to the tube member 92 due to vibration can be prevented.

In particular, in order to arrange the free end side of the tube member 92 in a compact manner, the structure through which the periphery of the rewinding unit 82 is passed only needs to form the clip member 62 in a part of the casing 82a of the rewinding unit 82, and has a simple structure. That's okay.
Note that the present invention is not limited to the above-described embodiment, and various modifications may be made without departing from the spirit of the present invention. For example, in one embodiment, a kannon door has been described as an example. However, the present invention is not limited to this, and the door may be applied to a laterally open door in which two doors open in the same direction. In one embodiment, an example of a structure in which the tube member is simply held by the holding portion has been described. However, the structure of the steady rest is not limited to such a structure, and other structures may be used. Of course, a buffer material may be interposed between the outer peripheral surface of the tube member and the holding portion, and the applied impact force may be buffered to protect the tube member from the impact. Of course, the present invention may be applied to a two-point seat belt device.

1 Car body 11 Boarding gate 15 Rear door (door)
25 Retractor device 33 Seat belt 60 Runout suppression structure (runout suppression unit)
62 Clip member (holding member)
70 Frame 80 Retractor 90 Pretensioner 92 Tube member

Claims (2)

A door that opens and closes a doorway formed in the vehicle body;
A retractor device provided on the door,
The retractor device includes a frame that is attached to a door, a retractor that is assembled to the frame and from which a seat belt can be pulled out, and a seat belt that is pulled out from the retractor when an impact force greater than a predetermined level is applied to the vehicle body. With a tensioner,
The pretensioner has a tube member having one end connected to the retractor and the other end extending to the periphery, and capable of generating a pulling force for pulling the seat belt,
Wherein between the other end portion of the retractor and said tube member may have a deflection suppressing portion suppresses the vibration of the tube member in the closing direction of the door,
The shake suppressing portion includes a base portion fixed to the retractor and a pair of sandwiching portions extending from the base portion toward the other end portion of the tube member, and the sandwiching portion elastically moves the other end portion of the tube member. A seat belt device for a vehicle characterized by being sandwiched between the two. The other end of the tube member has a gas generating part that operates the pretensioner,
2. The vehicle seat belt device according to claim 1, wherein the clamping unit suppresses the shake of the tube member in the opening / closing direction of the door by clamping the gas generation unit .

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