JP2022049857A - Seat belt device - Google Patents

Abstract

To provide a seat belt device which can inhibit occurrence of a submarine phenomenon quickly and enables improvement of occupant restraint performance with a reduced burden on an abdominal part of an occupant.SOLUTION: A seat belt device 1 includes: a seat belt 10; a buckle stay 29 of a buckle 28 to which a tongue 22 inserted into the seat belt 10 may be attached; a lap anchor stay 24 connected to an end of the seat belt 10; and a moving device 300. THe back stay 29 has an attachment point 29a at the first side in a width direction of a vehicle seat 100. The lap anchor stay 24 has an attachment point 24a at the second side in the width direction of the vehicle seat 100. The moving device 300 moves both of the attachment points 29a, 24a to the vehicle front side and the vehicle lower side during an emergency.SELECTED DRAWING: Figure 2

Description

The present invention relates to a seatbelt device.

Generally, in a three-point seatbelt device, the seatbelt that restrains the occupant has an upper guide loop or a shoulder belt that extends from the upper anchor to the tongue, and a lap belt that extends from the tongue to the lower anchor, and has a tongue. However, it is configured so that it can be inserted into a buckle fixed to the vehicle body. By inserting and fastening the tongue into the buckle, the seatbelt device constitutes a three-point restraint between the upper anchor, the buckle (tong) and the lower anchor. In this state, the shoulder belt is slanted in front of the occupant's chest from the upper part of one of the left and right sides of the occupant to the lower part of the other left and right, and the lap belt is laid from one of the left and right sides of the occupant to the other left and right of the occupant's waist. It is hung in front of you. Such a three-point seatbelt device prevents the occupant from being thrown forward in an emergency such as a vehicle collision.

As a seatbelt device of this type, a device that allows the movement of a buckle or the like in the event of a vehicle collision is also known. For example, Patent Document 1 discloses a seatbelt device provided with an energy absorbing mechanism that allows the buckle to move forward while being accompanied by a resistance force when an external force exceeding a predetermined value to the front of the vehicle is applied to the buckle. ing. According to Patent Document 2, when a load of a predetermined size or more is applied to the seat belt in the event of a vehicle collision, the fuse portion is plastically deformed, and the buckle and the lap anchor are displaced to the front side beyond the regulated position. Vehicle seatbelt devices that allow this are disclosed.

Japanese Unexamined Patent Publication No. 2004-161037 Japanese Unexamined Patent Publication No. 2019-182017

By the way, in the event of a vehicle collision, it is necessary to keep the lap belt on the pelvis of the occupant, but a submarine phenomenon occurs in which the belt comes off from the leading edge of the ilium of the pelvis and moves to the abdominal side. obtain. The submarine phenomenon is more likely to occur in the reclining posture (comfort posture) in which the seat is tilted down. When the submarine phenomenon occurs, the position of the lap belt moves above the leading edge of the ilium of the pelvis, so that the lap belt may not be able to exert its original occupant restraint function or may press the occupant's abdomen.

In order to suppress the submarine phenomenon, it is necessary to consider the slackening of the seat belt and the movement of the pelvis downward to the vehicle. In this regard, in the seatbelt devices described in Patent Documents 1 and 2, the movement of the buckle or the like at the time of a collision of the vehicle is limited to the front of the vehicle, and there is room for improvement in terms of measures against the submarine phenomenon. Further, since the movement of the buckle or the like is passive using the inertial force of the human body or the vehicle seat at the time of a vehicle collision, there is room for improvement in terms of responsiveness.

An object of the present invention is to provide a seatbelt device capable of rapidly suppressing the occurrence of a submarine phenomenon and improving occupant restraint performance by reducing the burden on the abdomen of the occupant.

The seatbelt device according to one aspect of the present invention is a buckle stay of a seatbelt and a buckle to which a tongue inserted through the seatbelt can be mounted, and a mounting point is provided on the first side in the width direction of the vehicle seat. A buckle stay that has a buckle stay, a lap anchor stay that is connected to the end of the seat belt and has a mounting point on the second side in the width direction of the vehicle seat, and a lap anchor stay that has a mounting point on the second side in the width direction of the vehicle seat. It is equipped with a moving device that moves the vehicle forward and downward.

According to this aspect, in an emergency, the attachment points of the buckle stay and the lap anchor stay move in front of the vehicle and below the vehicle, so that the seat belt is pulled in front of the vehicle and below the vehicle. By doing so, for example, the lap belt portion of the seat belt can be moved diagonally forward and downward to follow the movement of the pelvis of the occupant in an emergency, and can be applied to the ilium to restrain the occupant. Therefore, in an emergency, the occurrence of the submarine phenomenon can be suppressed, and the occupant restraint performance can be improved by reducing the burden on the occupant's abdomen. Further, since each attachment point of the buckle stay and the lap anchor stay is positively moved by the moving device, each attachment point can be moved quickly and responsively in an emergency.

In the above aspect, the moving device may be provided corresponding to the buckle stay and the lap anchor stay, respectively, and may have a guide for guiding the movement of each attachment point in front of the vehicle and downward in the vehicle.

According to this aspect, since the movement of each attachment point is guided by each guide, each attachment point can be moved stably or smoothly in the intended direction.

In the above embodiment, each guide may be attached to the first side and the second side of the vehicle seat.

According to this aspect, each guide can be provided by effectively utilizing the vehicle seat.

In the above embodiment, the moving device further comprises a slider provided at each attachment point and configured to be movable along each guide, each guide via each slider in front of the vehicle and at each attachment point. You may guide the movement downward.

According to this aspect, the movement of each attachment point is guided to each guide via each slider. This makes it possible to effectively utilize the existing configurations of the buckle stay and the lap anchor stay having each mounting point, as compared with the case where the movement of each mounting point is directly guided by each guide. That is, when guiding the existing buckle stay and lap anchor stay with each guide, it is sufficient to provide each slider corresponding to each guide while adopting the existing configuration as the buckle stay and lap anchor stay.

In the above embodiment, the buckle stay and the lap anchor stay may be rotatably attached to the slider at the attachment point, respectively.

According to this aspect, for example, the buckle stay and the lap anchor stay are rotated around their own attachment points in accordance with the movement of the seatbelt when the seatbelt is fastened and the movement of the occupant while the seatbelt is fastened. Can be done. This makes it possible to ensure the wearability of the seat belt even in a structure in which each mounting point is moved in an emergency.

In the above embodiment, the moving device is provided corresponding to the buckle stay and the lap anchor stay, respectively, and further has a locking mechanism for blocking the movement of each slider in a normal time and releasing the blocking of the movement in an emergency. May be.

According to this aspect, the locking mechanism can prevent undesired movement of each attachment point via each slider in normal times, and in an emergency, the intended direction of each attachment point via each slider (in front of the vehicle and below the vehicle). Can be made possible to move to.

In the above embodiment, each locking mechanism may block the movement of each slider with respect to each guide with a force of a predetermined value or less, and may release the blocking of the movement of each slider by receiving a force exceeding the predetermined value in an emergency.

According to this aspect, it is possible to configure a lock mechanism capable of blocking / releasing the movement of the slider by utilizing the action of force.

In the above aspect, each lock mechanism may be configured by a share pin.

According to this aspect, the locking mechanism can be configured by using easily available and inexpensive parts and by a simple structure that does not require a drive source.

In the above embodiment, the moving device is provided corresponding to the buckle stay and the lap anchor stay, respectively, and is connected to each slider with a power source that operates in an emergency and is configured to be pulled in by the operation of each power source. It further comprises a member, and each slider may move along each guide by pulling in each wire member.

According to this aspect, the slider can be actively moved by using a power source in an emergency. As a result, the slider can be moved quickly and reliably as compared with the case where the slider is passively moved by using the inertial force of the human body or the seat frame at the time of a vehicle collision, for example.

In the above embodiment, each power source is a gas generator, and the moving device is connected to a cylinder provided corresponding to each gas generator and each wire member, and each wire member is connected by gas pressure from each gas generator. It may further have a piston configured to move in a retracting direction.

According to this aspect, the slider can be moved at high speed by using the gas pressure of the gas generator. It is also possible to utilize existing pretensioners as devices including gas generators, wire members, pistons and cylinders.

In the above embodiment, each power source is an urging member connected to each wire member, and the urging force restored in the direction of pulling in each slider through each wire member is stored, and the moving device is a moving device. Each guide is further provided with a drive source that is driven in an emergency and one or more lock members that are driven from the first position to the second position by the drive of each drive source. Each slider engages with each lock member in the first position, and the engagement prevents the movement against the urging force of each urging member, while in an emergency, each slider has a second. It may be disengaged from each lock member moved to the position of, and may move along each guide by the urging force of each urging member.

According to this aspect, the mobile device can be configured by using a power source other than the gas generator. You can have a wider range of choices when designing mobile devices.

In the above embodiment, the moving device includes a single power source that operates in an emergency, a wire member that is connected to one of the sliders and configured to be pulled in by the operation of the power source, and a connecting member that connects the sliders to each other. , And one of the sliders is moved along one of the guides corresponding to one of the sliders by pulling in the wire member, and the other of the sliders is connected by the movement of one of the sliders. It may be pulled through the member and moved along the other of the guides corresponding to the other of the sliders in synchronization with the movement of one of the sliders.

According to this aspect, the sliders on both sides of the vehicle seat can be moved together by one or a common power source, and the movements can be synchronized. As a result, the number of parts can be reduced, and the buckle stay and the lap anchor stay can be moved at the same time, so that the occupant restraint performance can be further improved.

In the above embodiment, the moving device may move each attachment point in front of the vehicle and below the vehicle by at least 40 mm within 50 msec after the collision occurs.

According to this aspect, the necessary or suitable movement amount can be secured within the necessary or suitable time derived from the experiment or simulation, and the submarine phenomenon can be effectively prevented.

It is a perspective view which shows typically the state which the seat belt device which concerns on embodiment is mounted on a vehicle. It is a perspective view which shows an example of the moving unit on the lap anchor stay side. It is sectional drawing which shows an example of the internal structure of the existing pretensioner applied to the moving unit on the lap anchor stay side. It is a perspective view which shows the moving unit on the lap anchor stay side partially disassembled. It is a perspective view which shows an example of the moving unit on the buckle stay side. It is a figure which shows typically the operation of the seatbelt apparatus which concerns on embodiment in an emergency as compared with the normal time. It is a figure which shows the movement of an anchor after a vehicle collision in an embodiment in comparison with a conventional example, and is shown at each time point of (A) 0 msec, (B) 50 msec after a vehicle collision, and (C) 70 msec after a vehicle collision. Shows. It is a perspective view which shows by disassembling a part of the moving device of the seat belt device which concerns on the 1st modification of embodiment. 9 is a diagram showing a main part of the moving device, in which (a) is a state in which the lock member is arranged at the first position, and (b) is a state in which the lock member is moved from the first position to the second position. The state, (c), shows the state in which the lock member is arranged at the second position. It is a perspective view which shows the moving device of the seat belt device which concerns on the 2nd modification of embodiment.

A seatbelt device according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings. In this document, top and bottom, left and right, and front and back are defined as follows. When the occupant sits in a seat (vehicle seat) in a normal posture, the direction in which the occupant is facing is referred to as the front, and the opposite direction is referred to as the rear, and when the axis of coordinates is indicated, the direction is the front-back direction. When the occupant sits on the vehicle seat in a normal posture, the right side of the occupant is referred to as the right direction, the left side of the occupant is referred to as the left direction, and the left-right direction is used to indicate the axis of the coordinates. Similarly, when the occupant sits in a normal posture, the occupant's head direction is referred to as upward, the occupant's lumbar direction is referred to as downward, and the coordinate axis is referred to as the vertical direction.

As shown in FIG. 1, the vehicle seat 100 includes a seat back 110 that supports the back of the occupant, a seat cushion 112 on which the occupant sits, and a headrest 114 that supports the head of the occupant. The vehicle seat 100 may be a front seat (that is, a driver's seat or a passenger seat) or a rear seat. Inside the seat back 110 and the seat cushion 112, a seat frame and a seating frame forming the skeleton of the seat are provided, respectively, and these are connected to each other via a reclining mechanism. The seat cushion 112 covers, for example, the surface of the seating frame and the surface of the seat pad made of a urethane foam material or the like covering the periphery with a seat cover made of leather, fabric or the like.

The seatbelt device 1 is provided in association with the vehicle seat 100, and has a seatbelt 10 which is a webbing for restraining an occupant. The seat belt 10 has a shoulder belt 12 extending from the upper guide loop or the upper anchor 20 to the tongue 22, and a lap belt 14 extending from the tongue 22 to the lap anchor stay 24. The shoulder belt 12 is slanted in front of the occupant's chest from the upper part of the left and right sides of the occupant seated on the vehicle seat 100 to the lower part of the left and right sides. The lap belt 14 is laid in front of the occupant's waist from one of the left and right sides of the occupant to the other. The shoulder belt 12 and the wrap belt 14 are formed in a band shape by a continuous line.

The upper anchor 20 is provided on the upper wall portion of the vehicle interior or the upper part of the seat back 110. Although not shown, a retractor that winds up one end side of the seat belt 10 may be provided below the upper anchor 20 and the retractor may be fixed to the vehicle body or the seat skeleton.
The tongue 22 is inserted through the seat belt 10 and is configured to be attachable to the buckle 28. Specifically, the tongue 22 has a loop portion 26 through which the seatbelt 10 is slidably inserted. When the tongue 22 is attached to the buckle 28 and fastened, the seat belt 10 is folded back with the loop portion 26 as a boundary, and is divided into a shoulder belt 12 and a lap belt 14.
The lap anchor stay 24 is for fixing the other end of the seat belt 10 to a portion of the vehicle structure (for example, a vehicle frame, a seat frame, or a seating frame). Therefore, when the tongue 22 is attached to the buckle 28, the seatbelt device 1 defines a three-point constraint between the upper anchor 20, the tongue 22 (buckle 28), and the lap anchor stay 24.

Further, the seatbelt device 1 has a moving device 300 for moving the lap anchor stay 24 and the buckle 28 in front of the vehicle and below the vehicle in an emergency. The emergency refers to, for example, the time of a vehicle collision, the occurrence of an impact event on the vehicle, the time of overturning of the vehicle, and the like. However, it is not always limited to these.

The moving device 300 has a moving unit 30 for moving the lap anchor stay 24 of the lap anchor, and a moving unit 30'for moving the buckle stay 29 of the buckle 28. The moving unit 30'is located on the first side in the width direction of the vehicle seat (here, the outer side), and the moving unit 30 is located on the second side in the width direction of the vehicle seat (here, the inner side). To position. Further, all or most of the moving units 30 and 30'are provided, for example, between the floor surface of the vehicle body and the seat cushion 112, or in the seat cushion 112. In an emergency, the moving units 30 and 30'restrain the submarine phenomenon by actively moving the attachment points of the lap anchor stay 24 and the buckle anchor stay 29 in front of the vehicle and below the vehicle, and are restrained by the seat belt 10. Increase power. The mobile units 30 and 30'have similar structures to each other. In the following, first, an example in which the existing pretensioner is applied to a part of the mobile unit 30 will be described.

As shown in FIG. 2, the moving unit 30 has a power source 31, a piston cylinder unit 33, and a wire member 35. For these, the structure of the existing pretensioner can be used. Further, in addition to these, the moving unit 30 includes a guide 41 extending in front of the vehicle and toward the lower side of the vehicle, a slider 42 configured to be movable along the guide 41, and a slider 42 in a normal time other than an emergency. It also has a locking mechanism 43 (see FIG. 4) that prevents the movement of the vehicle.

As shown in FIG. 3, the power source 31 of the pretensioner is a gas generator, and can be configured by, for example, a micro gas generator (MGG). The power source 31 is electrically connected to, for example, the vehicle-side ECU, receives a signal for detecting an emergency situation from the vehicle-side ECU, operates, and generates gas. The power source 31 is attached to the piston cylinder unit 33 directly or via other members.

The piston cylinder unit 33 has a piston 37 that receives gas pressure from the power source 31 and moves in the first direction D1, a cylinder 39 that slidably accommodates the piston 37, and a piston 37 in the first direction D1. Has a check mechanism 38, which prevents the vehicle from moving in the opposite direction. The check mechanism 38 is composed of, for example, a ball interposed between the tapered portion of the piston 37 and the inner surface of the cylinder 39.

The wire member 35 is a pull-in member, which is also called a cable or a tension transmission member, and one end portion 35a is connected to the piston 37. A part of the wire member 35 is arranged inside the cylinder 39, and the rest is arranged outside the cylinder 39. The intermediate portion of the wire member 35 is turned by the fixing portion 40 (see FIG. 2). The wire member 35 is pulled in by the operation of the power source 31 in an emergency. Specifically, in an emergency, when the power source 31 is activated, the generated gas causes the piston 37 to move in the cylinder 39 in the first direction D1. As a result, the wire member 35 connected to the piston 37 is pulled in.

FIG. 4 is a perspective view showing a partially disassembled moving unit 30 of FIG. As shown in both figures, the slider 42 is connected to the other end 35b of the wire member 35 by a fastener 51 including bolts, washers and the like. Further, the slider 42 is connected to the lower end portion of the lap anchor stay 24 by a fastener 52 including a screw, a washer, and the like. That is, the lap anchor stay 24 is connected to the wire member 35 via the slider 42.

The lap anchor stay 24 of the lap anchor has an attachment point (anchor point) 24a for attaching the lap anchor stay 24 to the vehicle seat 100. The attachment point 24a is formed, for example, as a pin hole through which the threaded portion of the fastener 52 is inserted. The fastener 52 attaches the lap anchor stay 24 to the slider 42 via the attachment point 24a, and the lap anchor stay 24 is rotatable with respect to the slider 42 in the front-rear direction about the attachment point 24a. The lap anchor stay 24 is made of, for example, a metal plate member, has a mounting point 24a at the lower end portion in the longitudinal direction thereof, and holds the end portion of the seat belt 10 at the upper end portion in the longitudinal direction.

The guide 41 is inclined toward the lower side of the vehicle toward the front of the vehicle and extends linearly. In the illustrated example, the guide 41 extends diagonally downward at 45 degrees with respect to the horizontal direction. However, the degree of this inclination can be changed by various factors such as the properties of the vehicle seat 100 and the performance of the vehicle. Further, the guide 41 is not limited to a straight line, but may be curved. For example, the guide 41 may extend in an arc shape. As long as the locus of movement of the slider 42 guided by the guide 41 is in front of the vehicle and below the vehicle, the guide 41 can be extended in an appropriate shape.

The guide 41 is formed in the shape of a rail having a C-shaped cross section, for example, and houses the slider 42 in a slidable manner. Bolt holes for fixing the guide 41 are formed at both ends 41a and 41b of the guide 41. One end 41a of the guide 41 is fastened together with the fixing portion 40 of the piston cylinder unit 33. The guide 41 is fixed to, for example, the seat side structure 115. The seat side structure 115 is a part of the seating frame in the seat cushion 112 and constitutes the second side surface in the width direction of the vehicle seat 100. The configuration of the guide 41 is not limited to the illustrated example. For example, the guide 41 may be a slit formed in the seat side structure 115 or the like.

The lock mechanism 43 blocks the movement of the slider 42 in a normal state and locks the slider 42 to its initial position, while releases the prevention of the movement in an emergency and allows the slider 42 to move. The lock mechanism 43 blocks the movement of the slider 42 with respect to the guide 41 with a force equal to or less than a predetermined value, and releases the prevention of the movement of the slider 42 with a force exceeding the predetermined value in an emergency. For example, the lock mechanism 43 can be configured to have share pins 43a, 43a that connect the guide 41 and the slider 42 and prevent the slider 42 from moving with respect to the guide 41 with a shear force of a predetermined value or less. The share pins 43a and 43b may be one, but here, they are composed of two. The share pins 43a and 43b are press-fitted into the mounting holes 41c and 41d of the guide 41 and the through holes 42c and 42d of the slider 42, thereby connecting the guide 41 and the slider 42. The share pins 43a and 43b are configured to break when subjected to a shearing force exceeding a predetermined value. Here, in an emergency, the load input to the slider 42 via the wire member 35 becomes a shearing force exceeding a predetermined value. Therefore, in an emergency, the share pins 43a and 43b are broken, thereby releasing the inhibition of the movement of the slider 42 with respect to the guide 41, and the slider 42 starts moving from its initial position and moves along the guide 41. At this time, the attachment point 24a of the lap anchor stay 24 connected to the slider 42 also moves in the same manner.

Next, the moving unit 30'on the buckle 28 side will be described with reference to FIG. The mobile unit 30'can be configured in the same manner as the mobile unit 30. That is, the moving unit 30'can have a power source 31, a piston cylinder unit 33, a wire member 35, a guide 41, a slider 42, and a locking mechanism 43, similarly to the moving unit 30. The moving unit 30'can be symmetrical with the moving unit 30 and can have substantially the same shape and function. For example, the guide 41 in the moving unit 30'is fixed at both ends 41a and 41b to the seat side structure 116 on the inner side opposite to the seat side structure 115 on the outer side. Then, the slider 42 can be moved in front of the vehicle and below the vehicle along the guide 41. For each configuration of the mobile unit 30', the description of each configuration of the mobile unit 30 described above will be referred to, and duplicate description will be omitted here.

The moving unit 30'is different from the moving unit 30 in that the buckle stay 29 of the buckle 28 is connected to the slider 42 instead of the lap anchor stay 24. The buckle stay 29 has an attachment point 29a for attaching the buckle 28 to the vehicle seat 100. The attachment point 29a is formed as, for example, a pin hole like the attachment point 24a. The fastener 53 attaches the buckle stay 29 to the slider 42 via the attachment point 29a, and the buckle stay 29 is rotatable with respect to the slider 42 in the front-rear direction about the attachment point 29a. The buckle stay 29 is made of, for example, a metal plate member, has a mounting point 29a at the lower end portion in the longitudinal direction thereof, and has an upper end portion in the longitudinal direction connected to the buckle main body portion 27 (tong mounting portion). From another point of view, the buckle 28 has a buckle main body 27 and a buckle stay 29 that is separate from the buckle main body 27 and extends from the buckle main body 27, and has a mounting point 29a at the end of the buckle stay 29. It can be said that it is doing. In another embodiment, the buckle stay 29 and the buckle main body 27 may be made of the same member. With the above configuration, the attachment point 29a can be moved forward and downward of the vehicle as the slider 42 moves.

FIG. 6 is a diagram schematically showing the operation of the seatbelt device 1 in an emergency as compared with a normal time. In an emergency, the moving device 300 moves the attachment points 24a and 29a of the lap anchor stay 24 and the buckle stay 29 in front of the vehicle and below the vehicle. Specifically, first, the power sources 31 and 31 of the mobile units 30 and 30'are operated at the same timing in an emergency. Then, in each of the moving units 30 and 30', each slider 42 is pulled in by each wire member 35. As a result, the lock of each slider 42 is released, and the attachment points 24a and 29a move in front of the vehicle and below the vehicle together with each slider 42. The loci of movement of the attachment points 24a and 29a are the same as each other.

Here, it is preferable that the attachment points 24a and 29a move at least 40 mm in front of the vehicle and below the vehicle by 50 msec after the collision occurs. This is because if the amount of movement from the occurrence of a vehicle collision to 50 msec is 40 mm or less, the amount of movement required to effectively prevent the submarine phenomenon derived from an experiment or simulation may not be secured. The required amount of movement varies depending on the hardness of the seat cushion 112, the weight of the vehicle on which the seatbelt device 1 is installed, and the like. The softer the seat cushion 112, the greater the amount of movement required.

FIG. 7 is a diagram showing the movement of the anchor after the vehicle collision in the embodiment in comparison with the conventional example, in which (A) 0 msec, (B) 50 msec after the vehicle collision, and (C) 70 msec after the vehicle collision. Each time point is shown. With reference to FIG. 7, the action of the seatbelt device 1 on the occupant 200 in an emergency will be described focusing on the movements of the lap anchor stay 24 and the lap belt 14.

In the conventional seatbelt device, a pretensioner is connected to the lap anchor stay and the buckle stay, and in an emergency, the lap anchor stay and the buckle stay are pulled diagonally downward by the pretensioner to reduce the slack of the seat belt. Is. In a conventional seatbelt device, even if such a pretensioner is provided, a submarine phenomenon may occur in which the lap belt comes off from the anterior edge of the iliac bone of the pelvis and moves to the abdominal side (see:). FIG. 7 (B). When the submarine phenomenon occurs, the position of the lap belt 14 moves above the leading edge of the ilium of the pelvis, so that the lap belt 14 may not be able to exert its original occupant restraint function or may press the abdomen of the occupant 200. There is.

On the other hand, in the present embodiment, the lap anchor stay 24 and the buckle stay 29 move in front of the vehicle and below the vehicle in an emergency. This movement is similar to the movement of the pelvis of the occupant 200 in an emergency. That is, the attachment points 24a and 29a of the lap anchor stay 24 and the buckle stay 29 move so as to follow the movement of the pelvis (see: FIG. 7B). By such movement, the lap belt 14 is pulled diagonally forward and downward on both sides in the vehicle width direction. As a result, the lap belt 14 descends below the abdomen of the occupant 200, i.e. at the position of the ilium 210.

Then, when the occupant 200 moves forward due to the inertial force, the lap belt 14 rests on the ilium 210 and restrains the further forward movement of the occupant 200. Since the ilium 210 is a portion (skeleton) of the human body that is not easily deformed, the wrap belt 14 on the ilium 210 can exert the original occupant restraint function. Further, it is possible to prevent the lap belt 14 from biting into the abdomen of the occupant 200. In addition, since the attachment points 24a and 29a of the lap anchor stay 24 and the buckle stay 29 are moved so as to follow the movement of the pelvis, the submarine phenomenon can be suppressed.

As described above, according to the seatbelt device 1 according to the embodiment, it is possible to reduce the burden on the abdomen of the occupant and improve the occupant restraint performance in an emergency. In particular, in an emergency, the attachment points 24a and 29a of the lap anchor stay 24 and the buckle stay 29 are moved to the front of the vehicle and to the bottom of the vehicle, so that the submarine phenomenon can be suppressed. Moreover, since the attachment points 24a and 29a are positively moved by using the moving device 300, the attachment points 24a and 29a can be moved more quickly as compared with the case where the moving device 300 is not used.

The embodiments described above are for facilitating the understanding of the present invention, and are not for limiting the interpretation of the present invention. Each element included in the embodiment and its arrangement, material, condition, shape, size, and the like are not limited to those exemplified, and can be appropriately changed.

For example, the guide 41 and the slider 42 can be omitted. As an example, it is also possible to omit the slider 42, directly connect the lap anchor stay 24 or the buckle stay 29 to the wire member 35, and directly guide the movement of the lap anchor stay 24 or the buckle stay 29 with the guide 41. be. However, the one using the slider 42 can effectively utilize the existing configuration of the lap anchor stay 24 or the buckle stay 29. Further, it is advantageous to provide the guide 41 in that the attachment points 24a and 29a are stably or smoothly moved in the intended direction.

As the power source 31 of the mobile device 300, not only a gas generator but also a mechanical one or one using electricity or magnetism may be used. Further, the lock mechanism 43 of the moving device 300 is not limited to the share pin, and other mechanical configurations may be used. For example, as the lock mechanism 43, a deformable member is used instead of a shearing member such as a shear pin to prevent the slider 42 from moving with respect to the guide 41 with a force of a predetermined value or less, and a force exceeding a predetermined value is applied in an emergency. In response, the obstruction of the movement of the slider 42 may be released. Further, in another embodiment, as the lock mechanism 43, one using electricity or magnetism (for example, an electromagnetic solenoid or a micro gas generator) may be used.

Next, with reference to FIG. 8, the moving device 300 according to the first modification adopting another structure as the power source 31 and the locking mechanism 43 will be described by taking the moving unit 30 on the lap anchor stay 24 side as an example. .. The same applies to the moving unit 30'on the buckle stay 29 side, and the description thereof will be omitted.

As shown in FIG. 8, the urging member 331 is used as the power source of the moving unit 30. The urging member 331 is connected to the end of the wire member 335. The urging member 331 stores the urging force restored to the first direction D1 in which the slider 342 is pulled in via the wire member 335. The urging member 331 can be composed of, for example, a coil spring compressed in the direction opposite to the first direction D1. In another embodiment, the urging member 331 may be a coil spring extended in the direction opposite to the first orientation D1, or may be an urging member other than the spring.

The moving unit 30 has a drive source 345 driven in an emergency and a lock that moves from the first position (see FIG. 9A) to the second position (see FIG. 9C) by driving the drive source 345. It has members 343 and 344. The drive source 345 is attached to the guide 341 and is, for example, a solenoid valve, a micro gas generator, or a motor. Here, it is a solenoid.

As shown in FIG. 9, the lock member 343 (first plate) is formed in a semicircular shape and is rotatable about the center of the circle. The lock member 344 (second plate) is arranged between the movable portion of the drive source 345 and the lock member 343, and is formed in a hook shape. The lock member 344 is rotatable about the base end portion of the hook. The lock members 343 and 344 are attached to the guide 341 at each rotation center.

As shown in FIG. 9A, in a normal state, the slider 342 engages with the lock member 343, 344 in the first position, and moves against the urging force of the urging member 331 by the engagement. Is blocked. Specifically, the lower half of the string of the lock member 343 abuts on the slider 342, the upper half of the string of the lock member 343 abuts on the lower tip of the lock member 344, and the drive source 345 touches the upper tip of the lock member 344. The movable portion of the lock member 344 is in contact with the movable portion of the lock member 344, and the load applied to the lock member 344 is supported by the drive source 345. As a result, the rotation of the lock members 343 and 344 is prevented, and the movement of the slider 342 is prevented.

As shown in FIG. 9B, when the drive source 345 is activated in an emergency, the movable portion of the drive source 345 retracts, the lock member 344 rotates, and the engagement between the lock member 344 and the lock member 343 is released. Rock. Then, the lock member 343 is rotated. The rotation of the lock member 343 is performed by restoring the urging member 331, that is, the urging member 331 pulls in the slider 342 via the wire member 335, and the slider 342 presses the lock member 343.

As shown in FIG. 9 (c), when the lock member 343 pressed by the slider 342 rotates and moves to the second position, the slider 342 is disengaged from the lock members 343 and 344. Then, the slider 342 moves in the first direction D1 along the guide 341 due to the urging force of the urging member 331.

In this way, even with the moving device 300 according to the first modification using a structure different from the existing pretensioner, the attachment points 24a and 29a of the lap anchor stay 24 and the buckle stay 29 can be moved forward and downward of the vehicle. Can be moved. The lock members 343 and 344 can also be composed of one member.

Further, in another embodiment, the moving device 300 does not include the power source 31 for the lap anchor stay 24 and the power source 31 for the buckle stay 29, respectively, but has a common power source for both of them, and the lap anchor stay is provided. The slider 42 for 24 and the slider 42 for the buckle stay 29 may be moved together. An example of this is shown in FIG.

FIG. 10 is a perspective view showing a moving device 300 of the seatbelt device 1 according to the second modification of the embodiment. The moving device 300 includes a single power source 431 that operates in an emergency and a wire member 435 that is configured to be pulled in by the operation of the power source 431. The power source 431 can be configured by a gas generator in the same manner as the power source 31 described above. The wire member 435 is connected to either one of the sliders 442L and 442R (here, the slider 442L). The sliders 442L and 442R are connected to each other by a connecting member 436.

The connecting member 436 is combined with a wire guide 440 such as a pulley to form a block and harness device in which the amount of movement between the driven side slider 442L and the driven side slider 442R is equal. In the illustrated example, three wire guides 440 are used in the block and harness device. Instead of the pulley, a wire guide 440 having the same shape as the pulley may be used except that the disk portion does not rotate. The wire guide 440 is fixed to the seat side structures 115, 116 and the like that form a part of the vehicle seat 100. However, in another embodiment, the wire guide 440 may be fixed to the vehicle body portion between the floor surface of the vehicle body and the seat cushion 112, or may be fixed to a pipe or the like traversing the inside of the seat cushion 112.

One slider 442L moves along the guide 441L corresponding to the slider 442L by pulling in the wire member 435. The other slider 442R, which is not connected to the wire member 435, is pulled in through the connecting member 436 by the movement of one slider 442L, and the guide 441R corresponding to the slider 442R is synchronized with the movement of the slider 442L. Move along.

According to this aspect, the sliders 442L and 442R on both sides of the vehicle seat 100 can be moved together and the movements can be synchronized by the common power source 431. As a result, the number of parts can be reduced, and the buckle stay 29 and the lap anchor stay 24 can be moved at the same time, so that the occupant restraint performance can be further improved.

1 ... Seat belt device, 10 ... Seat belt, 12 ... Shoulder belt, 14 ... Wrap belt, 20 ... Upper anchor, 22 ... Tongue, 24 ... Wrap anchor stay, 24a ... Wrap anchor stay side mounting point, 26 ... Loop part , 27 ... Buckle body, 28 ... Buckle, 29 ... Buckle stay, 29a ... Buckle stay side mounting point, 30, 30'... Moving unit, 31,331,431 ... Power source, 33 ... Piston cylinder unit, 35,335 , 435 ... Wire member, 35a, 35b ... End, 37 ... Piston, 38 ... Buckle mechanism, 39 ... Cylinder, 40 ... Fixed part, 41,341,441L, 441R ... Guide, 41a, 41b ... End, 42 , 342, 442L, 442R ... Slider, 43 ... Lock mechanism, 43a, 43b ... Share pin, 42c, 42d ... Through hole, 51, 52, 53 ... Fastener, 100 ... Vehicle seat, 110 ... Seat back, 112 ... Seat Cushion, 114 ... headrest, 115, 116 ... seatside structure, 200 ... occupant, 210 ... intestinal bone, 300 ... moving device, 343 ... lock member, 344 ... second plate, 345 ... drive source, 436 ... connecting member, 440 ... wire guide, D1 ... first orientation.

Claims (13)

With seat belts
A buckle stay of a buckle to which a tongue inserted through the seat belt can be attached, and a buckle stay having an attachment point on the first side in the width direction of the vehicle seat.
A lap anchor stay connected to the end of the seat belt, the lap anchor stay having a mounting point on the second side in the width direction of the vehicle seat, and the lap anchor stay.
In an emergency, a moving device that moves both of the attachment points in front of the vehicle and below the vehicle,
Equipped with a seatbelt device. The moving device is
The seatbelt device according to claim 1, which is provided corresponding to the buckle stay and the lap anchor stay, and has a guide for guiding the movement of each attachment point in front of the vehicle and downward of the vehicle. The seatbelt device according to claim 2, wherein each guide is attached to the first side and the second side of the vehicle seat. The moving device is
Further having a slider provided at each of the mounting points and configured to be movable along the respective guides.
The seatbelt device according to claim 2 or 3, wherein each guide guides the movement of each attachment point in front of the vehicle and downward of the vehicle via each slider. The seatbelt device according to claim 4, wherein the buckle stay and the lap anchor stay are respectively rotatably attached to the slider at the attachment point. The moving device is
4. The seat belt device described in. 6. The lock mechanism claims to block the movement of the sliders with respect to the guides with a force of a predetermined value or less, and release the movement of the sliders with a force exceeding the predetermined value in an emergency. The seat belt device described in. The seatbelt device according to claim 7, wherein each lock mechanism is composed of a share pin. The moving device is
A power source that is provided corresponding to the buckle stay and the lap anchor stay and that operates in an emergency,
It further comprises a wire member that is coupled to each of the sliders and configured to be retracted by the operation of each of the power sources.
The seatbelt device according to any one of claims 4 to 8, wherein each slider moves along the respective guides by pulling in each of the wire members. Each of the power sources is a gas generator.
The moving device is
Cylinders provided for each gas generator and
The seatbelt device according to claim 9, further comprising a piston connected to each of the wire members and configured to move in a direction of drawing in the wire members by a gas pressure from the gas generator. Each of the power sources is an urging member connected to each of the wire members, and stores an urging force that restores the slider in the pulling direction via the respective wire members.
The moving device is
A drive source provided in each of the guides and driven in an emergency,
It further comprises one or more locking members that move from a first position to a second position by driving each of the drive sources.
In the normal state, each of the sliders engages with each of the lock members in the first position, and the engagement prevents the movement of each of the urging members against the urging force of the urging member.
Claimed that, in an emergency, the sliders are disengaged from the locking members that have moved to the second position and move along the guides by the urging force of the urging members. 9. The seatbelt device according to 9. The moving device is
A single power source that operates in an emergency,
A wire member connected to one of the sliders and configured to be pulled in by the operation of the power source.
Further has a connecting member for connecting the sliders to each other.
One of the sliders moves along one of the guides corresponding to one of the sliders as the wire member is pulled in.
The other of the sliders is pulled through the connecting member by the movement of one of the sliders and along the other of the guides corresponding to the other of the sliders so as to be synchronized with the movement of one of the sliders. The seatbelt device according to any one of claims 4 to 9. The seatbelt device according to any one of claims 1 to 12, wherein the moving device moves each attachment point in front of the vehicle and at least 40 mm below the vehicle by 50 msec after the occurrence of a collision.

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