JP6222449B2 - Vehicle seat belt device - Google Patents

Description

  The present invention relates to a vehicle seat belt apparatus having a retractor 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, as in the three-point seat belt device disclosed in Patent Document 1, the retractor is provided on the door, and 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 lap belt portion A structure with a tongue at the boundary between the shoulder belt and the shoulder belt is adopted. 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 the seat belt device, as in Patent Document 2, in order to further improve safety, there is a tendency to provide a lap pretensioner between the anchor portion and the seat belt end.
The lap pretensioner has a function of pulling the seat belt from the leading end side to restrain an occupant sitting on the seat when an impact force of a predetermined level or more is applied. Specifically, the lap pretensioner generally has a gas generating agent such as explosives, a cylinder having an ignition part and a piston, and a relay member connected to the piston on one end side of the cylinder. Then, by fixing one end of the cylinder and connecting the leading end of the relay member to the leading end of the seat belt, the displacement of the piston generated when gas is generated inside the cylinder is transmitted to the seat belt. It has a structure that draws in.

JP 2011-16531 A JP2013-163502A

In order to increase safety, a lap pretensioner may be provided on a door incorporating a seat belt device.
By the way, the lap pretensioner is a device in which support rigidity is ensured only by fixing one end side of the cylinder. For this reason, the wrap pretensioner is provided with a fixing portion only at one end of the cylinder.

Therefore, even when a wrap pretensioner is provided on the door, only one end of the cylinder is fixed to the door and the other end is extended along the door. That is, the lap pretensioner is installed with one-side support in which the other end is free even in the case of a door.
By the way, in the case of a door, unlike when a lap pretensioner is provided on the vehicle body, an excessive impact force may be applied to the lap pretensioner itself when the door is opened or closed. In particular, in the case of a kannon door, the wrap pretension is arranged close to the free end of the door together with the retractor, so that an excessive impact force is easily applied.

  However, since the cylinder of the lap pretensioner is supported on one side, if an excessive impact force is applied, the cylinder tends to swing excessively in the door opening / closing direction. In particular, in the case of a kannon door, the cylinder tends to swing excessively. This vibration may cause interference between the cylinder and the door panel and excessive stress generation in the vicinity of the fixed portion of the lap pretensioner, which may affect the fixed portion of the cylinder, the door panel, or the lap pretensioner. For this reason, it was considered difficult to install the lap pretensioner on the door.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vehicle seat belt apparatus in which a lap pretensioner is installed on a door while preventing interference between the cylinder and a door panel and excessive stress in the cylinder.

According to the first aspect of the present invention, there is provided a door that opens and closes an entrance / exit formed in a vehicle body, a retractor that is provided on the door and in which a seat belt is retractably accommodated, and is provided on the door. An anchor portion that fixes the tip portion, and a lap pretensioner that is interposed between the tip portion and the anchor portion of the seat belt and pulls the seat belt from the tip side when a predetermined impact force is applied to the vehicle body, The lap pretensioner has one end fixed to the anchor portion and the other end extending along the door, a piston accommodated in the cylinder and displaceable in the retracting direction of the seat belt, and a seat disposed at one end of the cylinder. The cylinder is connected to the front end of the belt and has a relay member that transmits the displacement of the piston to the seat belt. Have a deflection suppressing portion suppressing, pendulum damping unit consists bracket for holding the cylinder, the bracket, a holding seat which is held via the first fastening member in a state in which the cylinder is inserted, the strip plate A fixed seat fixed to the door inner panel via a second fastening member, and a relay seat integrally connecting the holding seat and the fixed seat in series. The holding seat and the fixed seat are cylinders. Was formed with an offset as a boundary .

According to the second aspect of the present invention, the fastening direction of the first fastening member and the fastening direction of the second fastening member are opposite to each other.
According to the third aspect of the present invention, the shake suppressing portion is provided on the other end side of the cylinder, and the second shake restricting portion is provided on one end side of the cylinder .

According to the first and second aspects of the invention, the cylinder of the lap pretensioner installed on the door is prevented from swinging in the door opening / closing direction by the swing suppressing portion, so that an excessive impact force is supported on one side when the door is opened / closed. Even if it is applied to the cylinder, it is possible to prevent the cylinder from interfering with the door panel and excessive stress from being generated near the fixed portion of the lap pretensioner.
Therefore, it is possible to install the lap pretensioner on the door while preventing interference between the cylinder and the door panel and excessive stress on the cylinder, and to install the seat belt device with the lap pretensioner on the door.

According to the invention of claim 3 , since the vibration in the door opening / closing direction is suppressed at both ends of the cylinder, the vibration of the cylinder can be further effectively suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a vehicle having a double door that is an aspect according to a first embodiment of the present invention. The front view which shows the seatbelt apparatus and lap pretensioner with which the inner surface of the rear door is equipped. The front view which expands and shows the lap pretensioner vicinity in FIG. Sectional drawing which follows the AA line in FIG. Sectional drawing which follows the BB line in FIG. The perspective view which shows each part structure of a shake suppression part. The front view which expands and shows the lap pretensioner vicinity used as the aspect which concerns on the 2nd Embodiment of this invention. Sectional drawing which follows the CC line | wire in FIG. The perspective view which shows each part structure of a shake suppression part. The front view which expands and shows the lap pretensioner vicinity used as the aspect which concerns on the 3rd Embodiment of this invention. Sectional drawing which follows the DD line | wire 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 so as to cover 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 seatbelt device 21 will be described with reference to FIG. 2. Reference numeral 25 denotes a retractor installed on a door inner panel portion located at the lower front part of the door inner panel 15b, and 27 denotes an upper part of the retractor 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, 30 is a door inner located on the upper front portion of the door inner panel 15b. A belt guide suspended from the panel portion via an adjuster mechanism 30a (for example, a slide structure using a guide rail) is shown. Incidentally, although not shown, an anchor hole is provided in the raised door inner panel portion 16a located at the lowermost front portion of the door inner panel 15b.

  The retractor 25 has a structure in which a spool 35 around which a seat belt 33 is wound is accommodated in a retractor main body portion 37. The seat belt 33 can be pulled out from the upper part of the retractor main body 37. The leading end portion of the seat belt 33 that is pulled out passes through the gap between the inner handle structure portion 27 and the door inner panel portion, the belt guide 30, and reaches the anchor portion 32. 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. That is, while pulling out the seat belt 33 from the retractor main body 37, the tongue 41 is moved to the side of the seat cushion 8 a of the front seat 7, specifically, to the buckle 43 arranged on the cushion side opposite to the entrance 11. When plugged in, 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 occupant's shoulder and is seated on the front seat 7. Restrain the crew.

A lap pretensioner 39 is interposed between the front end portion of the seat belt 33 and the anchor portion 32. The lap pretensioner 39 is an inflator type device that pulls the seat belt 33 from the front end side when a predetermined impact force is applied. FIG. 3 is an enlarged front view showing the vicinity of the lap pretensioner 39.
The lap pretensioner 39 will be described with reference to FIG. 3. The lap pretensioner 39 includes an elongated cylinder 45, a gas generator (not shown) such as a piston 47 and explosives housed in the cylinder 45, a gas An ignition part 49 for igniting the generating agent, a plate-shaped frame part 51 having a fixing hole at the center provided so as to protrude forward from one end of the cylinder 45, and a substantially half circumference around the fixing hole of the frame part 51 A wire insertion passage 53 formed in a shape, and a wire member 55 inserted into the wire insertion passage 53 so as to be displaceable. One end of the wire member 55 is connected to the piston 47 in the cylinder 45.

  The frame portion 51 is fixed to the door inner panel portion 16a by a fastening member, for example, a bolt member 57, which is screwed into the anchor hole portion of the door inner panel 15b from the fixing hole. An anchor portion 32 is a fixed portion of the frame portion 51 which is one end side of the cylinder 45. Due to the fixing to the raised door inner panel portion 16a, the cylinder 45 is arranged in parallel with a gap between the cylinder 45 and the panel surface of the door inner panel 15b. At this time, the wire member 55 led out from the end of the wire insertion passage 53 is disposed so as to extend obliquely forward and upward. Further, the cylinder 45 is arranged so that an acute angle with the cylinder 45, that is, a free end side which is the other end side of the cylinder 45 extends obliquely rearward and upward.

  The other end portion of the wire member 55 is connected to the tip end portion of the seat belt 33 via the belt connector 59, and the tip end portion of the seat belt 33 is fixed to the anchor portion 32 via the lap pretensioner 39. doing. When a predetermined impact force or more is applied to the vehicle body 1 due to a collision or the like by the lap pretensioner 39, gas is generated inside the cylinder 45, and the piston 47 is displaced by the gas generation. The belt belt 59 is transmitted to the seat belt 33 via the belt connector 59 (which corresponds to the relay member of the present application), and the seat belt 33 is retracted. That is, 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 lap pretensioner 39. 2 and 3 indicate a cover member 58 that covers the wire member 55 and the belt connector 59.

Further, the cylinder 45 is provided with a shake suppression structure 60 (corresponding to the shake suppression portion of the present application) that suppresses the shake of the cylinder 45.
That is, the lap pretensioner 39 receives an impact force from the door opening / closing direction when the rear door 15 is opened / closed. In particular, since the cylinder 45 is supported on one side and the free end side is easy to swing, depending on the opening / closing operation of the rear door 15, an excessive impact force may be applied to the cylinder 45 and the free end side of the cylinder 45 may swing excessively in the door opening / closing direction. is there.

However, due to the structure of the rear door 15, it is not possible to secure a gap between the cylinder 45 and the door inner panel portion that can allow excessive vibration.
For this reason, the cylinder 45 of the present embodiment is provided with a vibration suppression structure 60 to suppress interference with the door inner panel portion and generation of excessive stress in the vicinity of the fixed portion of the lap pretensioner 39.

For example, a structure that holds the cylinder 45 with a bracket 61 that is an integrally molded product of sheet metal is used for the vibration suppressing structure 60. This holding structure is shown in FIGS.
That is, as shown in FIG. 6, the bracket 61 has a holding seat 63 in which the band plate is bent in a C shape, and a band plate arranged at a point offset from the holding seat 63 is bent in an L shape. A seat 65 and a belt-shaped relay seat 67 that integrally connects the holding seat 63 and the fixed seat 65 in series are configured. Incidentally, a pair of parallel fastening seats 63a are integrally formed at both ends of the holding seat 63. That is, the bracket 61 is formed by bending a strip.

  As shown in FIGS. 5 and 6, the fixed seat 65 is a fastening member such as a bolt member 71 and a nut member 72 on a dedicated seat surface portion 69 formed in the door inner panel portion, which is near the middle of the cylinder 45. It is concluded by. A cylinder 45 is inserted into the holding seat 63. As shown in FIG. 4, the cylinder 45 is fastened between the fastening seats 63 a with a fastening member, for example, a screw member 73, and is fixed to the holding seat 63 by clamping with the fastening. That is, the bracket 61 has a structure in which the holding seat 63 and the fixed seat 65 are offset, and holds the outermost end portion of the cylinder 45 as much as possible while the fixed seat 65 remains in a fixed position. The relay seat 67 is arranged along the outer peripheral portion of the cylinder 45 facing the door inner panel surface, and the cylinder 45 is held not only by the holding seat 63 but also by the relay seat 67.

The bracket 61 provided in the gap between the door inner panel 15b and the cylinder 45 suppresses the swing of the cylinder 45 in the door opening / closing direction. This prevents the cylinder 45 from interfering with the door inner panel 15b or generating an excessive stress near the fixed portion of the cylinder 45 even when an excessive impact force is generated when the rear door 14 is opened and closed.
This means that the lap pretensioner 39 is installed on the rear door 15 while preventing interference between the cylinder 45 and the door inner panel 15 b and excessive stress from being generated in the cylinder 45.

  Therefore, installation of the seat belt device 21 with the wrap pretensioner to the rear door 15 can be realized. Moreover, the vibration suppressing structure 60 can be a simple structure because the bracket 61 is provided between the cylinder 45 and the panel surface of the door inner panel 25b facing the cylinder 45. In particular, it is optimal for a kannon door where an excessive impact force is easily applied to the cylinder 34 when the door is opened and closed.

7 to 9 show a second embodiment of the present invention.
In the present embodiment, the cylinder is not fixed only by the bracket as in the first embodiment, but a cushioning material is combined with the bracket to suppress the swing in the door opening / closing direction of the cylinder.
For example, a crank-shaped bracket 81 with a cushioning material 80 is interposed between a dedicated seat surface portion 69 of the door inner panel 15b and an end portion of the cylinder 45 disposed immediately above the seat surface portion 69. Is. Specifically, the bracket 81 includes a fixed seat 83 that is bolted to the seat surface portion 69, for example, a buffer seat 85 that is disposed to face the outer peripheral surface of the cylinder 45 facing the door inner panel 15b, and a bracket A relay portion 87 that connects the seat 83 and the cushioning material seat 85 is provided. A plate-shaped cushioning material 80 made of, for example, sponge rubber is attached to the surface portion of the cushioning material seat 85 facing the cylinder 45. The cushioning material 80 is abutted against or slightly pressed against the outer peripheral surface of the cylinder 45 to prevent the cylinder 45 from abutting against the door inner panel 15b.

That is, the cushioning material 80 suppresses the swing of the cylinder 45 in the door opening / closing direction, so that the cylinder 45 does not swing when the door is opened and closed that is subject to excessive impact force.
Even if it does in this way, there exists an effect similar to 1st Embodiment. In particular, the same structure is configured such that the impact force is buffered by the cushioning material 80 when the door is opened and closed, so that the impact force applied to the cylinder 45 is reduced and the influence of the impact force is suppressed. Incidentally, in the first embodiment, a cushioning material may be interposed between the holding seat and the cylinder.

10 and 11 show a third embodiment of the present invention.
In the present embodiment, not only the free end side of the cylinder 45 but also the fixed side of the cylinder 45 is provided with a measure for suppressing the vibration of the cylinder 45.
That is, as shown in FIGS. 10 and 11, the frame portion 51 of the wrap pretensioner 39 includes a bolt member 57 inserted through the fixing hole of the frame portion 51 and the anchor hole portion of the door inner panel portion 16a. The nut is fixed to the door inner panel 15b by a nut member 59 screwed into the bolt member end.

  In the present embodiment, using this fixing structure, an annular cushioning material 90 is provided around the bolt member 57 to suppress the vibration of the cylinder 45, and the cushioning material 90 is connected to the frame portion 51 and the door inner panel 15b. A vibration suppressing structure 62 is provided to suppress the vibration of the cylinder 45 by interposing it in a state of being compressed and deformed therebetween. Reference numeral 91 denotes a color member. Of course, you may provide the vibration suppression structure which used the buffer material in the other site | part.

If the vibration suppressing structures 60 and 62 are provided on both the one end side and the other end side of the cylinder 45 as described above, the vibration in the door opening / closing direction can be suppressed even on the fixed side (the other end side) of the cylinder 45. Therefore, the vibration of the cylinder 45 can be suppressed.
However, in FIGS. 7 to 11, the same parts as those of the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  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 the embodiment, the kannon type door is taken as an example. However, the present invention is not limited to this, and if the seat belt device is equipped with a lap pretensioner, the two doors open in the same direction. It may also be applied to other doors. Further, in the above-described embodiment, a bracket having a C-shaped holding seat, a crank-shaped bracket, or a structure that suppresses an impact force using a cushioning material, and the like have been described. However, the structure of the cylinder steadying is not limited to this structure. A structure using a bracket of another shape, a buffer material of another shape, or the like may be used. Of course, it may be applied to a two-point seat belt device.

11 Entrance / Exit 15 Rear door (door)
25 retractor 32 anchor part 33 seat belt 39 lap pretensioner 45 cylinder 47 piston 55, 59 wire member, belt connector (relay member)
60 Vibration suppression structure (vibration suppression part)

Claims (3)

A door that opens and closes a doorway formed in the vehicle body;
A retractor provided on the door, in which a seat belt is retractably accommodated;
An anchor portion provided on the door and fixing a front end portion of the seat belt;
A lap pretensioner that is interposed between a front end portion of the seat belt and the anchor portion, and that draws the seat belt from the front end side when a predetermined impact force is applied to the vehicle body;
The wrap pretensioner includes a cylinder having one end fixed to the anchor portion and the other end extending along the door, a piston accommodated in the cylinder and displaceable in a retracting direction of the seat belt, and one end of the cylinder Connected to the front end of the seat belt, and a relay member that transmits the displacement of the piston to the seat belt.
The cylinder, have a deflection suppressing portion suppresses the deflection of the door opening and closing direction of the cylinder,
The runout restraining portion includes a bracket that holds the cylinder, and the bracket is formed in a state where the cylinder is inserted and a holding seat that is held via a first fastening member, and a belt plate shape is formed on the door inner panel. A fixed seat fixed via a second fastening member; and a relay seat that integrally connects the holding seat and the fixed seat in series,
The seat belt device for a vehicle, wherein the holding seat and the fixed seat are formed offset with respect to the cylinder . The fastening direction of the first fastening member is opposite to the fastening direction of the second fastening member.
The vehicle seat belt device according to claim 1. The deflection suppressing portion is provided on the other end side of the cylinder ,
3. The vehicle seat belt device according to claim 1 , further comprising a second deflection restricting portion on one end side of the cylinder . 4.

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