JP2012183908A - Seat belt system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the release function of a tongue after a vehicle collision while suppressing external dimensions of a buckle and an increase in component cost.SOLUTION: In a seat belt system, the buckle 6 that detachably fixes the tongue provided on a belt includes: a buckle mechanism part 30 that fixes the tongue detachably; a cover 20 that covers the buckle mechanism part 30; and a release button 35 that is supported on the cover 20 movably in a vertical direction to enable the fixing of the tongue to be released by moving downward by a predetermined distance L to the frame 31 of the buckle mechanism part 30. In the seat belt system, a cover retaining part 33 that positions the frame 31 in the vertical direction with respect to a front cover 22 is provided in the front cover 22 of the cover 20, wherein the strength of a part P below the cover retaining part 33 of the front cover 22 is set lower than that of a part above the cover retaining part 33 of the front cover 22.

Description

  The present invention relates to a buckle structure in a seat belt device.

  BACKGROUND ART A vehicle seat belt device is configured to restrain an occupant by a belt by engaging a tongue provided on the belt with a buckle fixed to a vehicle body. In the seat belt device for the front seat, the buckle is disposed, for example, between the console box provided between the left and right front seats and the front seat so that the tongue insertion port faces upward. The buckle is provided with a release button, and by pressing the release button, the tongue locked to the buckle can be detached and the belt can be released.

  In the seatbelt device for the front seat in which the buckle is arranged as described above, the buckle is sandwiched between the seat and the console box and the buckle cover is strongly pressed in the event of a side collision of the vehicle. If the release button is pressed, the release button will not drop even if the release button is pressed, and the tongue may not be released. Therefore, a technology has been developed in which a protective member made by bending a thick metal plate is provided below the buckle cover so that the buckle cover is not directly subjected to a load from a console box or the like to protect the buckle ( Patent Document 1).

JP 2010-260368 A

However, when the protective member is provided below the buckle cover as in Patent Document 1, the overall shape of the buckle is increased, which may make layout difficult. Further, since a protective member is added, there is a problem in that the cost of parts is increased.
The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a seat that can secure a tongue releasing function after a vehicle collision while suppressing an increase in the external dimensions and component costs of the buckle. It is to provide a belt device.

  In order to achieve the above object, the seat belt device according to claim 1 is a seat belt device including a buckle for detachably fixing a tongue provided on the belt, and the buckle fixes the tongue detachably. The attachment / detachment mechanism section, the cover that covers the attachment / detachment mechanism section, and the cover that is supported by the cover so as to move in one direction and the tang fixing in the attachment / detachment mechanism section are released by moving in one direction with respect to the cover. And a prevention means for preventing overrun in which the release part moves more than a predetermined distance in one direction side, and the cover is provided with the prevention means and prevents the strength of the part on the one direction side from the prevention means. It is characterized in that it is set lower than the strength of the part opposite to the one direction side of the means.

According to a second aspect of the present invention, the seat belt device according to the first aspect of the present invention is characterized in that the seat belt device has a notch in a portion of the cover that is closer to the one direction than the prevention means.
According to a third aspect of the present invention, the seat belt device according to the first or second aspect is characterized in that the thickness of the one-side portion of the cover is thinner than the thickness of the opposite-side portion of the prevention means. And

  According to a fourth aspect of the present invention, in the seat belt device according to any one of the first to third aspects, the buckle is disposed between the front seat of the vehicle and a console box provided on a side of the front seat. It is characterized by that.

  According to the first aspect of the present invention, since the strength of the portion on one side of the cover prevention means is set lower than the strength of the portion on the opposite side to the one direction, for example, one direction, that is, release of the release portion. When the moving direction is downward, when an excessive load is applied upward from the bottom of the cover to the lower surface of the cover due to a vehicle collision or the like, the lower part of the cover is deformed or damaged before the prevention means. do. Therefore, it is possible to prevent the prevention means from being damaged without providing a protective member below the cover. Therefore, when the release portion is pushed after a vehicle collision, it is possible to ensure the downward movement of the release portion to a predetermined position with respect to the mechanism portion, while suppressing an increase in the external dimensions and parts costs of the buckle, The tongue can be detached after the collision, and the restraint of the occupant by the belt can be reliably released.

According to the second aspect of the present invention, the cutout portion is provided in a portion on one side of the cover preventing means, so that the outer dimension of the cover is easily increased without increasing the outer dimension of the cover. The strength of the part can be lowered.
According to the invention of claim 3, since the thickness of the portion on one side of the cover prevention means is thinner than the thickness of the portion on the opposite side to the one direction of the cover, the outer dimension of the cover is increased. Without this, it is possible to easily reduce the strength of the portion on one side of the prevention means.

  According to the invention of claim 4, even when an excessive load acts on the buckle due to the side of the seat itself on which the occupant is seated, the buckle is pressed against the console box at the time of a vehicle side collision. The buckle prevention means can be prevented from being displaced and the tongue can be reliably released.

1 is a front view of a passenger compartment showing a configuration of a seat belt device according to an embodiment of the present invention. It is a front view which shows the shape of a buckle. It is a side view which shows the shape of a buckle. It is sectional drawing which shows the structure inside a buckle. It is a perspective view which shows the internal shape of a surface cover.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of a passenger compartment showing a configuration of a seat belt device 1 according to an embodiment of the present invention.
The seat belt device 1 according to the present embodiment is a three-point seat belt device for a front seat of a vehicle, and winds up a belt 3 that hangs around the body of an occupant seated on the front seat 2 and one end of the belt 3. A retractor 4, a tongue 5 movably supported on an intermediate portion of the belt 3, and a buckle 6 that detachably fixes the tongue 5 are provided.

The other end of the belt 3 is supported by a connecting member 7 provided outside the front seat 2 and fixed to the vehicle body. The belt 3 is supported at the intermediate portion by the buckle 6 through the tongue 5 as described above, and is supported by a shoulder belt anchor 9 provided on the upper part of the pillar 8 of the vehicle body. The retractor 4 is built in the lower part of the pillar 8.
The buckle 6 is fixed to the vehicle body via a connecting member 11 extending upward from the floor surface 10 of the vehicle body. The buckle 6 is arranged inside the front seat 2 so that the insertion port 12 of the tongue 5 faces upward. Further, the buckle 6 is disposed at substantially the same vertical position as the seat surface 2 a of the front seat 2, and the insertion port 12 of the tongue 5 is disposed slightly above the seat surface 2 a of the front seat 2. .

A console box 15 is provided between the left and right front seats 2 of the vehicle body. The console box 15 is formed in a box shape having a rectangular parallelepiped shape, and is arranged such that the upper surface 15a is slightly lower than the seating surface 2a of the front seat 2.
FIG. 2 is a front view showing the outer shape of the buckle 6, and FIG. 3 is a side view showing the outer shape of the buckle 6. FIG. 4 is an enlarged cross-sectional view showing the internal structure of the buckle 6.

  As shown in FIGS. 2 to 4, the buckle 6 includes a box-shaped cover 20 and a buckle mechanism portion 30 (detachable mechanism portion) accommodated in the cover 20. The cover 20 is configured by combining a front cover 22 and a back cover 23 formed of resin or the like. An insertion port 12 for inserting the tongue 5 is provided on the upper surface of the cover 20. An opening 24 into which the tip of the connecting member 11 is inserted is provided on the lower surface of the cover 20 opposite to the insertion port. The tip of the connecting member 11 is connected to a frame 31 in the cover 20 described later. Yes. The tongue 5 is formed of a thick metal plate and includes a locking hole 25.

The buckle mechanism unit 30 (attachment / detachment mechanism unit) includes a frame 31 made of metal and a claw unit (not shown) rotatably supported by the frame 31, and a tongue in which the claw unit is inserted into the insertion port 12. 5 has a structure that can be locked in the five locking holes 25. The claw portion is biased in a direction to be locked in the locking hole 25 by a spring (not shown).
The front cover 22 of the buckle 6 is provided with a claw-like cover holding portion 33 that protrudes inward from the inner wall at the intermediate portion in the vertical direction. The frame 31 is configured to be locked to the cover holding portion 34 and to be restricted from moving downward (one direction).

Further, a release button (release unit) 35 is supported on the front cover 22 of the buckle 6 so as to be movable in the vertical direction. The release button 35 is urged upward with respect to the frame 31 by a spring (not shown). The release button 35 has a function of releasing the claw portion from the locking hole 25 when the release button 35 is pushed downward (one direction) by a predetermined distance L against the urging force of the spring.
Therefore, the buckle 6 has a configuration in which the tongue 5 automatically locks the tongue 5 by inserting the tongue 5 into the insertion port 12, and the tongue 5 is not detached from the buckle 6 even when the belt 3 is pulled. In addition, the tongue 5 can be detached by pressing the release button 35.

Furthermore, the prevention means 34 is attached so as to prevent overrun in which the release button 35 moves more than the predetermined distance L. The prevention means 34 may be formed of a rib.
FIG. 5 is a perspective view showing the internal shape of the front cover 22.
As shown in FIG. 5, in the present embodiment, in particular, a notch groove 40 (notch portion) is provided inside the portion P below the cover holding portion 33 of the surface cover 22. The cutout groove 40 may be provided as appropriate so that the strength of the portion P below (one direction side) the cover holding portion 33 of the front cover 22 is lower than the strength of the portion above the cover holding portion 33.

  In the vehicle in which the buckle 6 is disposed on the inner side of the front seat 2 as in the present embodiment, for example, when the seat 2 on which the occupant is seated moves when the side collision occurs, the seat 2 Thus, the buckle 6 is pressed against the console box 15, and the lower surface of the front cover 22 of the buckle 6 is caught by the corner of the upper surface 15 a of the console box 15 and pushed upward. Since the frame 31 is connected to the vehicle body via the connecting member 11 and is prevented from moving upward, the cover holding portion 33 that positions the frame 31 and the surface cover 22 when the front cover 22 is pushed upward. There is a possibility that the load concentrates on the resin cover and damages the cover holder 33 made of resin. If the cover holding portion 33 is damaged in this way, the prevention means 34 moves relatively upward, so that even if the release button 35 is pushed, the release button 35 is moved downward with respect to the frame 31 by a predetermined distance L. It becomes impossible to move and the claw part cannot be released. Therefore, the tongue 5 cannot be detached from the buckle 6, and there is a possibility that it becomes impossible to release the restraint of the occupant by the belt 3.

  In the present embodiment, as described above, the strength of the portion P below the cover holding portion 33 of the surface cover 22 is lower than the strength of the portion above the cover holding portion 33, so the surface cover 22 is the console. Even if it is pushed upward at the corner of the box 15, the portion P below the cover holding portion 33 is deformed, and the action of the load on the cover holding portion 33 can be reduced to prevent breakage. Therefore, the positioning of the frame 31 and the front cover 22 is ensured, and the claw portion can be released by the release button 35.

As described above, since the cover holding portion 33 is prevented from being damaged by providing the cutout groove 40 in the front cover 22, it is not necessary to provide a protective member for the front cover 22 below the buckle 6, and the outer shape of the buckle 6 as a whole. It is possible to prevent the tongue 5 from being detached by preventing the cover holding portion 33 from being damaged while suppressing the increase in the cost and the increase in the component cost.
In the above embodiment, the notch groove 40 is provided in the portion P below the cover holding portion 33 of the front cover 22, but instead of the notch groove 40, the plate of the portion P below the cover holding portion 33. The thickness may be thinner than the upper part. Even in this case, similarly to the above embodiment, the strength of the portion P below the cover holding portion 33 of the front cover 22 is easily made lower than the cover holding portion 33 to prevent the cover holding portion 33 from being damaged. Can do. Moreover, you may perform both the said notch groove 40 and the plate | board thickness reduction of the site | part P together.

DESCRIPTION OF SYMBOLS 1 Seat belt apparatus 2 Front seat 6 Buckle 15 Console box 20 Cover 22 Surface cover 30 Buckle mechanism part 33 Cover holding part 34 Prevention means 35 Release button (release part)
40 Notch groove

Claims (4)

A seat belt device having a buckle for removably fixing a tongue provided on a belt,
The buckle is
An attachment / detachment mechanism for removably fixing the tongue;
A cover covering the attaching / detaching mechanism,
A release portion that is supported by the cover so as to move in one direction and moves the predetermined distance in the one direction relative to the cover to release the tongue from the attachment / detachment mechanism portion;
Preventing means for preventing overrun in which the release portion moves more than the predetermined distance in the one direction side, and
The cover is provided with the prevention means, and the strength of the part on the one-direction side of the prevention means is set lower than the strength of the part of the prevention means opposite to the one-way side. Seat belt device.   2. The seat belt device according to claim 1, further comprising a notch at a portion of the cover that is closer to the one direction than the prevention means.   3. The seat belt device according to claim 1, wherein a thickness of a portion of the cover on the one-direction side with respect to the prevention means is thinner than a thickness of the portion on the reverse-direction side.   The seat belt device according to any one of claims 1 to 3, wherein the buckle is disposed between a front seat of a vehicle and a console box provided on a side of the front seat.

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