JP2021030848A - Buckle pretensioner device - Google Patents

Abstract

To obtain a buckle pretensioner device which can secure a stroke of a pretensioner without enlarging the device.SOLUTION: In a buckle pretensioner device 10, one end 34A of a wire 34 is connected to a buckle device 16 and the other end 34B is connected to a piston 32 provided within a pretensioner body 30. The one end 34A of the wire 34 is connected to a connection member 50 housed in the buckle device 16. The connection member 50 includes a fixing part 50A and a pair of protruding parts 50B. The fixing part 50A is disposed between a buckle frame 20 and a fixture 46 which is disposed facing the buckle frame 20. Further, the pair of protruding parts 50B is provided protruding from the fixing part 50A. The protruding parts 50B, making the pair, are respectively engaged with an engagement hole 54 formed at the buckle frame 20 and the fixture 46.SELECTED DRAWING: Figure 1

Description

The present invention relates to a buckle pretensioner device.

Patent Document 1 discloses a buckle pretensioner device provided on a side portion of a seat cushion in a vehicle seat in the seat width direction. In this buckle pretensioner device, one end of a wire extending from a pretensioner main body including a gas generator is connected to the buckle device. Further, when the gas generator is activated, the piston moves in the cylinder arranged inside the pretensioner main body due to the pressure of the generated gas. Then, the other end of the wire connected to the piston is pulled toward the pretensioner main body side. As a result, the buckle device connected to one end of the wire and the tongue plate engaged with the buckle device are moved to the lower side of the seat, and the binding force of the occupant by the webbing is increased.

Japanese Unexamined Patent Publication No. 2007-283823

By the way, in the technique described in Patent Document 1, one end of a wire extending from the buckle pretensioner device and the buckle device are connected via a clamp portion (anchor member). The tip of this clamp is formed in a plate shape and is fixed to a buckle frame (channel member) arranged inside the buckle device using rivets, and the other end is fixed to one end of the wire outside the buckle device. Has been done. Therefore, it is necessary to secure a sufficient stroke of the pretensioner in order to avoid interference between the other end of the clamp portion arranged outside the buckle device and the pretensioner main body when the wire is pulled in. However, when the wire is extended to secure the stroke, the entire device becomes large.

In consideration of the above facts, an object of the present invention is to secure the stroke of the pretensioner in the buckle pretensioner device provided on the vehicle seat without increasing the size of the device.

The buckle pretensioner device according to the present invention according to claim 1 includes a buckle frame constituting a skeleton inside, is arranged on the side portion of the seat cushion in the seat width direction, and has a removable tongue plate inserted into the webbing. The buckle device, the pretensioner body that is placed under the seat cushion and operates to move the movable part provided inside, and one end is connected to the buckle device and the other end is the movable part. A wire that transmits a load to the buckle device by being pulled into the inside of the pretensioner main body as the movable portion moves, and is arranged to face the buckle frame and the buckle frame. A fixing portion that is arranged between the fixtures and one end of the wire is fixed, an engaging hole that protrudes from the fixing portion and is formed in the buckle frame, and a pair of protrusions that engage with the fixture. It has a portion and a connecting member housed in the buckle device.

In the buckle pretensioner device according to the present invention according to claim 1, the buckle device is arranged on the side portion of the seat cushion in the seat width direction, and the buckle device has a tongue plate inserted into the webbing so as to be removable. It is configured in. Further, one end of a wire is connected to the buckle device. On the other hand, a pretensioner main body is arranged below the seat cushion, and the other end of the wire is connected to a movable portion provided inside the pretensioner main body. As a result, when the pretensioner main body is activated, the wire is pulled into the pretensioner main body as the movable portion moves. At the same time, the buckle device connected to one end of the wire and the tongue plate attached to the buckle device are pulled in, and the binding force of the occupant by the webbing is enhanced.

Here, one end of the wire is connected to the buckle device via a connecting member housed in the buckle device. This connecting member includes a fixing portion arranged between the buckle frame and a fixture arranged so as to face the buckle frame, and one end of a wire is fixed to the fixing portion. Further, the connecting member includes a pair of convex portions protruding from the side surface of the fixing portion, and the pair of convex portions are engaged with the engaging hole formed in the buckle frame and the fixture, respectively.

In this way, the connecting member connecting one end of the wire and the buckle device is housed in the buckle device. Therefore, the pull-in amount of the wire that can be pulled into the inside of the pretensioner main body can be increased as compared with the configuration in which the connecting member such as the clamp portion is arranged outside the buckle device. In addition, the configuration can increase the amount of wire drawn while maintaining the existing positions of the buckle device and the pretensioner main body. Therefore, it is possible to prevent the entire device from being enlarged in order to secure the stroke of the wire.

Further, a pair of convex portions protruding from the fixing portion are engaged with the buckle frame and the fixture. Therefore, it is possible to suppress the increase in size of the buckle device as compared with the configuration in which the end portion fixed to the buckle device is extended from the clamp portion.

As described above, the buckle pretensioner device according to claim 1 has an excellent effect that the stroke of the pretensioner can be secured without increasing the size of the device.

It is a partial side view which shows the lower part of the vehicle seat to which the buckle pretensioner device which concerns on 1st Embodiment is applied. It is an enlarged side view of the main part which shows the main part of the buckle pretensioner apparatus shown in FIG. 1 in an enlarged manner. (A) is an enlarged cross-sectional view showing a state in which the buckle frame according to the present embodiment is cut along the line 3A-3A of FIG. 2, and (B) is a cut along the line 3B-3B of FIG. It is an enlarged cross-sectional view corresponding to FIG. It is an enlarged cross-sectional view of a main part corresponding to FIG. 2 which shows the state which cut along the line 4-4 of FIG.

Hereinafter, the buckle pretensioner device according to the present embodiment will be described with reference to FIGS. 1 to 4. The arrow FR appropriately shown in each figure indicates the front side of the vehicle, and the arrow UP indicates the upper side of the vehicle. In the following description, when the front-rear, up-down, and left-right directions are used without special mention, the front-rear direction of the vehicle front-rear direction, the up-down direction of the vehicle up-down direction, and the left-right direction when facing the traveling direction shall be indicated.

Further, in FIG. 1, a dummy for a collision test is shown instead of the actual occupant, and this dummy is an AF05 dummy of Hybrid 3 (HB3) as an example. In the following description, the dummy will be referred to as "occupant P".

As shown in FIG. 1, the buckle pretensioner device 10 of the present embodiment is arranged inside the vehicle seat 12 in the seat width direction, and includes the buckle device 16, the pretensioner main body 30, and the wire 34. It is composed of.

The buckle device 16 is arranged inside the seat cushion 14 on which the occupant P is seated in the seat width direction, and includes a box-shaped housing 18 and a buckle frame 20 arranged inside the housing 18. .. Further, an engaging portion 22 is provided on the tip end side of the buckle frame 20, so that the buckle device 16 and the tongue plate 24 can be engaged and disengaged. On the other hand, one end 34A of the wire 34 is connected to the base end side of the buckle frame 20 via a connecting member 50 described later.

The tongue plate 24 is inserted through a webbing 26 for restraining an occupant seated on the vehicle seat 12. The webbing 26 is a non-stretchable band-shaped member, and is a component of a so-called three-point seat belt device. One end of the webbing 26 is locked to a webbing take-up device (not shown) arranged below the center pillar arranged on the outer side of the vehicle seat 12 in the seat width direction. The other end of the webbing 26 is fixed to an anchor member attached to a vehicle body floor (not shown) on the outside of the vehicle seat 12 in the seat width direction. Further, the intermediate portion of the webbing 26 is inserted into a shoulder anchor (not shown) arranged in the upper part of the center pillar and folded back. The webbing take-up device may be arranged on the seat back (reference numeral omitted) of the vehicle seat, and the anchor member attached to the vehicle body floor may be arranged on a frame (not shown) of the vehicle seat 12. ..

In the webbing 26, the portion between the shoulder anchor and the anchor member is folded back using the tongue plate 24, and the portion above the seat from the tongue plate 24 is the shoulder webbing portion 26A that restrains the shoulder and chest of the occupant P. It is said that. On the other hand, the portion below the seat from the tongue plate 24 is a lap webbing portion 26B that restrains the lumbar portion L of the occupant P.

On the other hand, the pretensioner main body 30 is configured to pull the buckle device 16 toward the lower side of the vehicle via the wire 34 by operating. When the buckle device 16 is pulled toward the lower side of the seat, the tongue plate 24 engaged with the buckle device 16 is moved and the webbing 26 is pulled in. As a result, the binding force of the occupant P by the webbing 26 is increased. The pretensioner main body 30 is arranged in the lower part of the inner portion of the seat cushion 14 in the seat width direction, and is formed in a cylindrical shape with the seat front-rear direction as the longitudinal direction as an example. A gas generator, a cylinder, and a piston 32 (not shown) are arranged inside the pretensioner main body 30. Further, the other end 34B of the wire 34 is fixed to the piston 32. The piston 32 corresponds to the movable portion in the present invention.

The pretensioner main body 30 operates by receiving an operating current from a control unit (not shown) at the time of a vehicle collision, and generates high-pressure gas from a gas generator. Then, the piston 32 to which the wire 34 is fixed is moved along the longitudinal direction of the pretensioner main body 30 by the pressure of the gas, and the wire 34 is pulled into the pretensioner main body 30.

The wire 34 connects the buckle device 16 and the pretensioner main body 30, one end 34A in the longitudinal direction is connected to the buckle frame 20, and the other end 34B in the longitudinal direction is connected to the piston 32 of the pretensioner main body 30. ..

Next, the connection structure between the buckle frame 20 arranged inside the buckle device 16 and one end 34A of the wire 34 will be described with reference to FIGS. 2 to 4. In FIG. 4, the engaging portion 22, the tongue plate 24, and the webbing 26 are not shown.

As shown in these figures, the buckle frame 20 is opened by a back surface portion 40 formed in a long rectangular plate shape and side wall portions 42 erected from both ends of the back surface portion 40 in the short side direction. It is formed in a cross-sectional shape. Further, in each side wall portion 42, a rectangular notch portion 44 cut out from the front side of the buckle frame 20 is formed at an end portion on the pretensioner main body side. Then, the fixture 46 is locked so as to be hung over these two notches 44. The fixture 46 is formed of a metal material as an example, and is formed in a long plate shape with the short side direction of the buckle frame 20 as the longitudinal direction when viewed from the front. The fixture 46 is fixed to the buckle frame 20 by a bolt 48 penetrating the back surface portion 40 of the buckle frame 20 and one end portion of the fixture 46 in the longitudinal direction, and a nut 49 screwed into the bolt 48. As a result, the fixture 46 is arranged so as to face the buckle frame 20.

The bolt 48 and the nut 49 are arranged at positions that do not interfere with the connection member 50 described later, which is arranged in the center of the buckle frame. Specifically, it is arranged at a position closer to one side in the short side direction than the center of the buckle frame 20 (a position closer to the right in FIG. 2) in the front view. The arrangement position of the bolt 48 and the nut 49 is a position on the upper side of the vehicle with respect to the connection member 50 described later when the buckle device 16 is installed at an appropriate position. The proper position of the buckle device 16 is the tilted posture shown in FIG. 1, and is a position where the buckle device 16 is slightly tilted from the vertical direction to the front side of the seat when the vehicle seat 12 is viewed from the side. In FIG. 1, the vertical direction of the vehicle seat 12 is indicated by the alternate long and short dash line V.

As shown in FIGS. 3A and 4, one end 34A of the wire 34 fixed to the connecting member 50 is arranged between the back surface 40 of the buckle frame 20 and the fixture 46. The connecting member 50 is made of a metal material, and includes a fixing portion 50A to which one end 34A of the wire 34 is fixed and a pair of convex portions 50B protruding from the side surface of the fixing portion 50A.

The fixing portion 50A is a clamp portion that sandwiches one end 34A of the wire 34, and is formed in a prismatic shape whose axial direction is the vertical direction (long side direction of the back surface portion 40) of the buckle frame 20. The fixing portion 50A is in a state of being pressed against the back surface portion 40 by using the fixing tool 46, and the side surface facing the back surface portion 40 and the side surface facing the fixing tool 46 are in contact with the back surface portion 40 and the fixing tool 46, respectively. ing. The fixing portion 50A is configured so as not to swing when the buckle device 16 is used. Further, as shown in FIG. 3A, a through hole 52 penetrating along the axial direction is formed in the axial center portion of the fixing portion 50A, and one end of the wire 34 is formed in the through hole 52. 34A is inserted and fixed.

The pair of convex portions 50B extend from the side surface of the prism along a direction substantially orthogonal to the axial direction on the tip end side of the fixing portion 50A. One of the pair of convex portions 50B penetrates the engaging hole 54 formed in the back surface portion 40 in a state where the connecting member 50 is connected to the buckle frame 20. Further, the other of the pair of convex portions 50B is arranged on the tip end side of the buckle frame 20 from the fixture 46 facing the back surface portion 40, and is engaged with the fixture 46. As a result, when the wire 34 is pulled toward the pretensioner main body 30, a tensile load is received by the buckle frame 20 and the fixture 46 and the pair of convex portions 50B engaged with both, and one end 34A of the wire 34 buckles. It is configured to prevent deviation from the device 16.

According to the connection structure having the above configuration, the connecting member 50 is joined to the buckle frame 20 inside the buckle device 16, and the connecting member 50 is not exposed to the outside of the buckle device 16.

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

In the buckle pretensioner device 10 of the present embodiment, the buckle device 16 is arranged inside the seat cushion 14 in the seat width direction, and the buckle device 16 can engage the tongue plate 24 inserted through the webbing 26. It is configured as follows. Further, one end 34A of a long wire 34 is connected to the buckle device 16. On the other hand, the pretensioner main body 30 is arranged below the seat cushion 14, and the other end 34B of the wire 34 is connected to the piston 32 provided inside the pretensioner main body 30. As a result, when the pretensioner main body 30 is operated, the wire 34 is pulled into the pretensioner main body 30 as the piston 32 moves. At the same time, the buckle device 16 connected to one end 34A of the wire 34 and the tongue plate 24 attached to the buckle device 16 are pulled in, and the binding force of the occupant by the webbing 26 is enhanced.

Here, one end 34A of the wire 34 is connected to the buckle device 16 via a connecting member 50 housed in the buckle device 16. The connecting member 50 includes a fixing portion 50A arranged between the buckle frame 20 and the fixture 46 arranged facing the buckle frame 20 inside the buckle device 16, and the fixing portion 50A is connected to the wire 34. One end is fixed. Further, the connecting member 50 includes a pair of convex portions 50B protruding from the side surface of the fixing portion 50A, and the pair of convex portions 50B are formed in the engaging holes 54 and the fixture 46 formed in the buckle frame 20, respectively. Engage.

Since the connecting member 50 connecting one end of the wire 34 and the buckle device 16 is housed in the buckle device 16 in this way, as compared with the configuration in which the connecting member such as the clamp portion is arranged outside the buckle device, The length of the wire 34 can be extended. As a result, interference between the fixing portion 50A and the pretensioner main body 30 is avoided, and the amount of the wire 34 that can be drawn into the pretensioner main body 30 is increased. As a result, when the pretensioner main body 30 is operated, the tongue plate 24 can be prevented from being separated by the impact of interference between the fixed portion 50A and the pretensioner main body 30, and the wire 34 can be prevented from coming off due to the breakage of the fixed portion 50A. it can.

In addition, the configuration can increase the pull-in amount of the wire 34 while maintaining the existing positions of the buckle device 16 and the pretensioner main body 30. Therefore, it is possible to prevent the entire device from being enlarged in order to secure the stroke of the wire 34.

Further, since the pair of convex portions 50B provided on the side surface of the fixing portion 50A engages with the buckle frame 20 and the fixture 46, the end portion fixed to the buckle device is extended from the clamp portion. It is possible to suppress the increase in size of the buckle device 16 as compared with the above.

Further, in the present embodiment, the side surface of the fixing portion 50A facing the back surface portion 40 and the side surface facing the fixing tool 46 are in contact with the back surface portion 40 and the fixing tool 46, respectively, and the connecting member 50 is a buckle frame. It is sandwiched between 20 and the fixture 46. Therefore, it is possible to reduce the swing of the connecting member 50 and suppress the generation of abnormal noise during normal use of the buckle device 16.

Further, in the present embodiment, the buckle frame 20 and the fixture 46 are fixed by using the bolt 48 and the nut 49. As a result, even if a plurality of types of wires having different materials and dimensions are applied, the distance between the buckle frame 20 and the fixture 46 can be easily adjusted, and the versatility is excellent.

Further, the bolt 48 and the nut 49 are arranged so that the bolt 48 and the nut 49 are located on the upper side of the vehicle with respect to the connecting member 50 in a state where the buckle device 16 is installed at an appropriate position. As a result, when the tightening strength between the connecting member 50 and the buckle frame 20 decreases due to long-term use, the buckle device 16 that tries to move in the direction of gravity from the original proper position moves with the connecting member 50 and the bolt 48. It is regulated by the engagement of. As a result, the proper position of the buckle device 16 can be maintained for a long period of time.
[Supplemental Information]

The present invention is not limited to the above, and it goes without saying that various modifications other than the above can be carried out within a range that does not deviate from the gist thereof.

For example, in the above embodiment, the front side of the seat of the vehicle seat 12 substantially coincides with the front side of the vehicle, but the present invention is not limited to this, and the front side of the seat is oriented to a direction other than the front side of the vehicle in an autonomous driving vehicle or the like. May be good.

Further, in the above embodiment, the webbing 26 is a webbing of a three-point seatbelt device, but the webbing 26 is not limited to this, and can be used for webbing of other forms of seatbelt devices such as a two-point type and a four-point type. It may be applied.

10 Buckle pretensioner device 14 Seat cushion 16 Buckle device 20 Buckle frame 24 Tongue plate 26 Webbing 30 Pretensioner body 32 Moving part (piston)
34 Wire 34A One end 34B Other end 46 Fixture 50 Joining member 50A Fixing part 50B Convex part 54 Engagement hole

Claims (1)

A buckle device that has a buckle frame that constitutes the skeleton inside, is placed on the side of the seat cushion in the seat width direction, and the tongue plate inserted into the webbing is removable.
The pretensioner body, which is located at the bottom of the seat cushion and operates to move the movable parts provided inside,
One end is connected to the buckle device and the other end is connected to the movable portion, and the other end is pulled into the pretensioner main body as the movable portion moves, thereby transmitting a load to the buckle device. With wire
A fixing portion arranged between the buckle frame and a fixture arranged so as to face the buckle frame and having one end of the wire fixed, and an engagement formed on the buckle frame protruding from the fixing portion. A connecting member including a hole and a pair of protrusions that engage with the fixture, respectively, and housed in the buckle device.
Buckle pretensioner device with.