JP2022060827A - Vehicular seatbelt device - Google Patents

Abstract

To synchronize movement of a buckle with movement of a lamp anchor to inhibit a submarine phenomenon more effectively.SOLUTION: A vehicular seatbelt device 1 includes: a shaft 20 which is provided so as to be rotatable in an anteroposterior direction around a rotation axis extending in a width direction of a vehicle seat 10; a lap anchor stay 31 of a lap anchor 30 for holding an end part 2e of a seat belt 2 which moves in conjunction with rotational operation of the shaft 20; a buckle stay 41 of a buckle 40 to which a tongue 2t of the seat belt 2 may be attached and which moves in conjunction with rotational operation of the shaft 20; and an actuator serving as a power source which drives the shaft 20 to rotate the shaft 20 around the rotation axis. During a vehicle emergency, the shaft 20 is rotated by a predetermined angle to move the lap anchor 30 and the buckle 40 from positions where they are located before the vehicle's emergency to the forward and lower side.SELECTED DRAWING: Figure 7

Description

The present invention relates to a vehicle seatbelt device.

The so-called submarine phenomenon that can occur during a vehicle collision (it is necessary to keep the lap belt on the pelvis of the occupant during the collision, but the lap belt moves upward from the anterior edge of the ilium of the pelvis and moves to the abdominal side. Various seatbelt devices have been proposed that can effectively restrain the pelvis of the occupant in order to suppress the phenomenon.

For example, Patent Document 1 discloses a vehicle seatbelt device having a structure in which the forward displacement of a buckle or a lap anchor is restricted by a fuse portion. In this vehicle seatbelt device, when a load of a predetermined value or more is applied to the seatbelt on the front side of the seat at the time of a vehicle collision, the fuse portion is plastically deformed, and the buckle and lap anchor exceed the regulated position on the front side. Allow to be displaced to. According to this, the moment centered on the seat belt that acts on the occupant by inputting the collision load etc. to the vehicle is absorbed by the plastic deformation of the fuse portion and the displacement of the occupant, and as a result, the collision load etc. is input to the vehicle. However, it is explained that it is possible to prevent the occupant from slipping off the seat cushion. In order to stably restrain the pelvis of the occupant in such a structure, it is important that the buckle and the lap anchor start to move and synchronize at the same time as much as possible.

Japanese Unexamined Patent Publication No. 2019-182017

However, in the seatbelt device as described above, the movements of the buckle and the lap anchor do not always occur at the same time, and there is a problem that stable pelvic restraint cannot be guaranteed.

Therefore, an object of the present invention is to provide a vehicle seatbelt device capable of synchronizing the movements of the buckle and the lamp anchor to more effectively suppress the submarine phenomenon.

One aspect of the present invention is a vehicle seatbelt device in a vehicle seat with an integrated seatbelt.
A shaft provided so as to be rotatable in the front-rear direction around a rotation axis extending in the width direction of the vehicle seat,
A lap anchor stay that holds the end of the seat belt and that moves in conjunction with the rotational movement of the shaft.
A buckle stay that can be fitted with a seatbelt tongue, and a buckle stay that moves in conjunction with the rotational movement of the shaft.
An actuator that is a power source that drives the shaft to rotate around the axis of rotation,
Equipped with
This is a vehicle seatbelt device that rotates the shaft by a predetermined amount to move the lap anchor and buckle forward and downward from the position in front of the vehicle emergency in the event of a vehicle emergency.

In the vehicle seatbelt device of this aspect, the lap anchor and the buckle move at the same time in conjunction with the rotational movement of the shaft. It is possible to restrain.

Moreover, the configuration in which the shaft is rotated to interlock the members as described above is also a structure that makes it easy to construct a relatively simple and robust structure.

Further, the configuration in which the shaft is rotated to interlock the members as described above is also preferable in that the lap anchor and the buckle can be moved forward and downward in an arc shape from the position in front of the vehicle emergency. That is, for example, even when the abdomen of the occupant is extremely large, the seat belt can be easily moved to the pelvis of the occupant by moving the lap anchor and the buckle in an arc shape (or a trajectory close to the arc). It has become.

The vehicle seatbelt device of the above aspects may further include a lap anchor side link attached to one side of the shaft.

In the vehicle seatbelt device of the above-described embodiment, the lap anchor stay may be pin-coupled to the lap anchor side link.

The vehicle seatbelt device of the above aspects may further include a buckle anchor side link attached to the other side of the shaft.

In the vehicle seatbelt device of the above-described embodiment, the buckle stay may be pin-coupled to the buckle anchor side link.

The vehicle seatbelt device of the above embodiment may be provided with a stopper that directly or indirectly regulates the movable range of the lap anchor.

The vehicle seatbelt device of the above embodiment may include a stopper that directly or indirectly regulates the movable range of the buckle.

The vehicle seatbelt device of the above-described embodiment may further include a holding member that holds one or both positions of the lap anchor stay and the buckle stay in the initial position.

The holding member in the vehicle seatbelt device of the above-described embodiment may be a member that receives a load acting in an emergency of the vehicle and releases the state of holding one or both of the lap anchor stay and the buckle stay. ..

In the vehicle seatbelt device of the above-described embodiment, the shaft may be provided in the hollow portion of the pipe connected to both side frames of the vehicle seat.

In the vehicle seatbelt device of the above-described embodiment, the actuator may be a pretensioner unit that ignites explosives in an emergency of the vehicle and instantaneously rotates the shaft by the generated gas pressure.

In the vehicle seatbelt device of the above-described embodiment, the pretensioner unit includes a transmission member that transmits a rotational driving force to a pinion provided on a shaft by utilizing a gas pressure generated by explosive ignition. May be good.

In the vehicle seatbelt device of the above-described embodiment, the actuator may be a pretensioner unit that ignites explosives in a vehicle emergency and instantly pulls a wire with the generated gas pressure to rotate the shaft.

In the vehicle seatbelt device of the above-described embodiment, the shaft may be provided with a pulley around which a wire is wound.

In the vehicle seatbelt device of the above-described embodiment, the pipe may be provided with a through hole for passing a wire.

According to the present invention, the movements of the buckle and the lamp anchor can be synchronized, and the submarine phenomenon can be suppressed more effectively.

It is a perspective view from the left front of the seat which shows the outline of the seat belt device for a vehicle which concerns on 1st Embodiment of this invention. It is a perspective view from the right front of the seat which shows the outline of the structure of the seat belt device for a vehicle. It is an exploded perspective view from the left front of the seat which shows the structural example of the side (outer lap side) where the lap anchor is provided in the seat belt device for a vehicle. It is an exploded perspective view from the right front of the seat which shows the structural example of the side (inner buckle side) where the buckle is provided in the seat belt device for a vehicle. It is a figure which shows the shaft provided in the pipe and the hollow part thereof. It is a figure which shows the structure of both ends of a shaft in an enlarged manner. It is a perspective view from the left front of the seat explaining the operation of the seat belt device for a vehicle at the time of a vehicle collision. It is a perspective view from the right front of the seat explaining the operation of the seat belt device for a vehicle at the time of a vehicle collision. It is a side view explaining the operation of the lap anchor at the time of a vehicle collision. It is a side view on the left side of the seat which shows the state of the lap anchor of a seatbelt device and its surroundings before a vehicle collision, together with the sitting posture of an occupant represented by a skeleton. It is a side view of the left side of the seat which shows the state of a lap anchor of a seatbelt device immediately after a vehicle collision (t = 90ms) and its surroundings, together with a sitting posture of an occupant represented by a skeleton. It is a side view on the right side of the seat which shows the state of a buckle of a seatbelt device and its surroundings before a vehicle collision, together with a sitting posture of an occupant represented by a skeleton. It is a side view of the right side of the seat which shows the state of a buckle of a seatbelt device immediately after a vehicle collision (t = 90ms) and its surroundings, together with a sitting posture of an occupant represented by a skeleton. It is a perspective view from the left front of the seat which shows the outline of the structure of the seat belt device for a vehicle which concerns on 2nd Embodiment of this invention. FIG. 14 is a perspective view from the left front of the seat showing a modified example of the configuration of the vehicle seat belt device shown in FIG. 14. It is a perspective view which shows the structure of the pulley provided on the shaft and the periphery thereof in an enlarged manner. It is an enlarged view which shows the pipe provided with the through hole for passing a wire. It is a figure which shows the structural example and the operation principle of the pretensioner unit with a built-in ball. It is a figure which shows the structural example and the operation principle of the pretensioner unit for pulling in a wire. It is a figure based on the content excerpted from the document [1] for explaining a submarine index ξ and the like. It is a figure based on the content excerpted from the document [2] for explaining the angle BTP formed by the pelvis and the lap belt. It is a table which shows the difference between the prior art and the vehicle seatbelt apparatus which concerns on this application about the presence or absence of the occurrence of a submarine phenomenon and the predictor of a submarine phenomenon in Example 2. It is a graph which shows the difference between the prior art and the vehicle seatbelt apparatus which concerns on this application for each of (A) a submarine index ξ and (B) a BTP angle. The movement of the inner buckle side after the vehicle collision is shown in comparison with the conventional example, and is a diagram at each time point (A) at 0 ms, (B) 50 ms after the vehicle collision, and (C) 70 ms after. The movement of the inner buckle side after the vehicle collision is shown in comparison with the conventional example, and is a diagram at each time point (A) at 0 ms, (B) 50 ms after the vehicle collision, and (C) 70 ms after.

Hereinafter, the configuration of the present invention will be described with reference to an example of an embodiment shown in the 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. The vehicle seat may be a front seat (that is, a driver's seat or a passenger seat) or a rear seat.

As shown in FIGS. 1 and 2, the vehicle seatbelt device 1 has a seatbelt 2 which is a webbing that restrains an occupant. The seat belt 2 has a shoulder belt 2a extending from the upper guide loop or the upper anchor to the tongue 2t, and a lap belt 2b extending from the tongue 2t to the lap anchor 30. The shoulder belt 2a is slanted in front of the occupant's chest from the upper part of one of the left and right sides of the occupant seated on the vehicle seat 10 to the lower part of the other left and right. The lap belt 2b 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 2a and the wrap belt 2b are formed in a band shape by one continuous line. The tongue 2t is inserted through the seat belt 2 and is configured to be attachable to the buckle 40. When the tongue 2t is attached to the buckle 40, the vehicle seatbelt device 1 defines a three-point constraint between the upper anchor, the tongue 2t (buckle 40), and the lap anchor 30.

The vehicle seatbelt device 1 according to the present invention is configured to rotate the shaft 20 to move the lap anchor 30 and the buckle 40 forward and downward from the position before the collision in the event of a vehicle emergency. The vehicle emergency refers to, for example, a vehicle collision, an impact event on the vehicle, a vehicle overturning, and the like, but is not limited thereto. Hereinafter, a preferred embodiment of the present invention will be described by taking a vehicle collision as an example as a vehicle emergency and an example of a seat belt device 1 for a vehicle with an integrated seat (seat integrated).

[First Embodiment]
The vehicle seatbelt device 1 of the present embodiment includes a shaft 20, a lap anchor 30, a lap anchor stay 31, a buckle 40, a buckle stay 41, a pretensioner unit 50, and the like (see FIG. 1 and the like). In the following, the vehicle seatbelt device 1 in which the lap anchor 30 and the like are arranged on the left side (outer lap side) of the vehicle seat 10 and the buckle 40 and the like are arranged on the right side (inner buckle side) of the vehicle seat 10 will be taken as an example. As will be described, it goes without saying that the present invention can be applied to the vehicle seatbelt device 1 having the reverse arrangement (see FIG. 2).

The shaft 20 extends in the width direction (crossing direction) of the vehicle seat 10 and rotates in the front-rear direction about a rotation axis (crossing axis) C (see FIG. 5) extending in the width direction of the vehicle seat 10. , The movements of the lap anchor 30 and the buckle 40 at the time of a vehicle collision are linked. In the present embodiment, the shaft 20 is provided in a rotatable state in a hollow portion of a pipe 14 which is a structural material connecting the left side frame 12L and the right side frame 12R of the vehicle seat 10 (FIGS. 3 and 5). Etc.). For example, a resin collar 15 is provided at the left and right openings of the pipe 14 (see FIG. 5). A non-circular shaft portion 20h having a hexagonal cross section is formed at both ends of the shaft 20, and a threaded portion 20s is further formed on the tip end side thereof (see FIG. 6). A washer 23w, a pinion 21, and a moving arm 32 are provided at the left end of the shaft 20 and are fastened with a screw nut 23s that meshes with the screw portion 20s.

The pinion 21 is a member that rotates the shaft 20 by receiving the driving force of the pretensioner unit 50. The pinion 21 is provided with a non-circular hole 21a having a shape in which the non-circular shaft portion 20h engages (see FIG. 3).

The moving arm 32 is provided as a link lever member that transmits the rotational movement of the shaft 20 to the lap anchor stay 31 and interlocks them. A non-circular hole 32a having a shape in which the non-circular shaft portion 20h engages is provided at the base end portion of the moving arm 32, and a pin hole 32b through which the share pin 37 is inserted is provided between the base end portion and the tip end portion. (See Fig. 3). A lap anchor stay 31 is pin-coupled to the tip of the moving arm 32 by using, for example, a rivet base 33b and a rivet head 33h (see FIG. 3).

The lap anchor stay 31 of the lap anchor 30 is provided so as to move in conjunction with the rotational operation of the shaft 20. The lap anchor stay 31 constitutes a part of the lap anchor 30, and is formed integrally with or separately from other parts of the lap anchor 30.

The lap anchor 30 is a member that holds the end portion of the seat belt 2. In the present embodiment, the pin hole 31a provided at the end of the lap anchor stay 31 functions as an anchor point (mounting point) of the lap anchor 30 (see FIG. 1 and the like). Specifically, the lap anchor 30 has a mounting point for mounting the lap anchor 30 at a position on the left side of the seat cushion of the vehicle seat 10, and the mounting point is configured by the pin hole 31a. .. Fasteners (rivet base 33b and rivet head 33h) attach the lap anchor 30 to the moving arm 32 via the pin holes 31a. The lap anchor 30 is rotatable in the front-rear direction about the attachment point (pin hole 31a). In another embodiment, another member that functions as a mounting point may be provided at the end of the lap anchor stay 31.
The movable range of the lap anchor 30 is regulated by the stopper base 36 and the stopper 38.

The stopper base 36 is a member that defines an initial position (normal position before a vehicle collision) of the lap anchor 30. In the present embodiment, the stopper base 36 having a shape bent in a crank shape is attached to the left side frame 12L with the mounting screw 36b, and the moving arm 32 is positioned to define the initial positions of the lap anchor stay 31 and the lap anchor 30. (See FIGS. 3, 10, etc.). The share pin 37 is inserted into the pin hole 36a provided in the stopper base 36.

The share pin 37 is provided as a holding member for holding the lap anchor 30 and the lap anchor stay 31 in the initial position, and is inserted into the pin hole 36a of the stopper base 36 and the pin hole 32b of the moving arm 32 on the left side. It is fastened to the frame 12L (see FIG. 3). The share pin 37 is made of a material or a shape that breaks due to a shearing force acting from the lap anchor stay 31 at the time of a vehicle collision. For example, in the present embodiment, a narrow diameter portion 37a is provided in the middle of the share pin 37 so that it is easily broken when subjected to a shearing force (see FIG. 3). The share pin 37 is only a suitable example of the holding member. In addition to such a share pin 37, various members that release the holding state by being deformed or the like by receiving a load acting in an emergency of the vehicle can be used as the holding member.

The stopper 38 is a member that regulates the movable range of the lap anchor 30 that moves when the vehicle collides. In the present embodiment, the stopper 38 having a shape bent in a crank shape is attached to the left side frame 12L with the mounting screw 38a so that the moving arm 32 during operation comes into contact with the stopper 38 during the operation (FIGS. 3 and 11). Etc.).

The pretensioner unit 50 functions as an actuator that serves as a power source for rotationally driving the shaft 20 around its central axis (transverse axis). In the present embodiment, a known Pyrotechnical Pretensioner that ignites gunpowder at the time of a vehicle collision and instantly rotates the shaft 20 by the generated gas pressure is adopted as the pretensioner unit 50. The outline of the pretensioner unit 50 of this embodiment will be described below (see FIG. 18). That is, the pretensioner unit 50 of the present embodiment has a plurality of balls 52 driven by the gas pressure of the gas generator 51 generated by ignition of explosives in an emergency, a tube 53 accommodating the plurality of balls 52, and a ball receiver. 54 and (see FIG. 18). When a vehicle collision is detected by a collision sensor (not shown) or the like, the high-pressure gas injected from the gas generator 51 is supplied into the tube 53, and the ball 52 in the tube 53 transmits the driving force to the pinion 21. The pinion 21 is rotated (see FIGS. 3, 18, etc.).

Such a pretensioner unit 50 is provided in a state of being positioned at a predetermined position with respect to the left base plate 61. Positioning of the pretensioner unit 50 with respect to the left base plate 61 can be performed, for example, by using a cut-up 61a provided on the left base plate 61 (see FIG. 3). The pretensioner unit 50 positioned at a predetermined position with respect to the left base plate 61 is covered with the pretensioner unit cover 62 (see FIG. 3 and the like).

The moving arm 42 is provided as a link lever member that transmits the rotational movement of the shaft 20 to the buckle stay 41 and interlocks them. The base end of the moving arm 42 is provided with a non-circular hole 42a in which the non-circular shaft portion 20h at the right end of the shaft 20 engages, and the share pin 47 is inserted between the base end and the tip. A pin hole 42b is provided (see FIG. 4). A buckle stay 41 is pin-coupled to the tip of the moving arm 42 using, for example, a rivet base 43b and a rivet head 43h (see FIG. 4).

The buckle stay 41 of the buckle 40 is provided so as to move in conjunction with the rotational operation of the shaft 20. The buckle stay 41 constitutes a part of the buckle 40 and is integrally formed with other parts of the buckle 40. In another embodiment, the buckle stay 41 may be formed as a part of the buckle 40 so as to be a separate member from other parts of the buckle 40.

The buckle 40 is a member to which the tongue 2t of the seat belt 2 can be attached. In the present embodiment, the pin hole 41a provided at the end of the buckle stay 41 functions as an anchor point (mounting point) of the buckle 40 (see FIG. 2 and the like). Specifically, the buckle 40 has a mounting point for mounting the buckle 40 at a position on the right side of the vehicle seat 10, and the mounting point is configured by the pin hole 41a. Fasteners (rivet base 43b and rivet head 43h) attach the buckle 40 to the moving arm 42 via the pin holes 41a. The buckle 40 is rotatable in the front-rear direction about the attachment point (pin hole 41a).
The movable range of the buckle 40 is regulated by the stopper base 46 and the stopper 48.

The stopper base 46 is a member that defines an initial position (normal position before a vehicle collision) of the buckle 40. In the present embodiment, the stopper base 46 having a shape bent like a crank is attached to the right side frame 12R with the mounting screw 46b, and the moving arm 42 is positioned to define the initial positions of the buckle stay 41 and the buckle 40. (See FIGS. 4, 12, etc.). The share pin 47 is inserted into the pin hole 46a provided in the stopper base 46.

The share pin 47 is provided as a holding member for holding the buckle 40 and the buckle stay 41 in the initial position, and is inserted into the pin hole 46a of the stopper base 46 and the pin hole 42b of the moving arm 42, and is inserted into the pin hole 42b of the moving arm 42, and is inserted into the right side frame 12R. It is fastened to (see Fig. 4). The share pin 47 is made of a material or a shape that breaks due to a shearing force acting from the buckle stay 41 when a vehicle collides. For example, in the present embodiment, a narrow diameter portion 47a is provided in the middle of the share pin 47 so that it is easily broken when subjected to a shearing force (see FIG. 4). The share pin 47 is only a suitable example of the holding member. In addition to the share pin 47, various members that release the holding state by being deformed by receiving a load acting in an emergency of the vehicle can be used as the holding member.

The stopper 48 is a member that regulates the movable range of the buckle 40 that moves when the vehicle collides. In the present embodiment, the stopper 48 having a shape bent like a crank is attached to the right side frame 12R with the mounting screw 48a so that the moving arm 42 during operation comes into contact with the moving arm 42 during the operation (FIGS. 4 and 13). Etc.).

Further, the right base plate 65 and the cover 66 are attached to the right side frame 12R (see FIG. 4 and the like).

In the vehicle seatbelt device 1 of the present embodiment as described above, the buckle 40 and the lap anchor 30 are bar members (that is, the shaft 20 and the left and right moving arms 32, 42) formed in a U shape when viewed from the front. It is mechanically connected by (combination with), and is configured so that the rotational movement of the shaft 20 is transmitted and interlocked via the link levers (moving arms 32, 42). Further, the buckle 40 and the lap anchor 30 are attached in a state where the degree of freedom other than the rotational movement around the U-shaped bar member is limited. At the time of a vehicle collision, the bar member rotates by the driving force of the pretensioner unit 50 driven by a pyro or the like (see FIGS. 7, 8 and the like). The bar member rotates about a transverse axis by a predetermined angle (90 ° as an example) and reaches the final position (see FIGS. 9, 11, 13, etc.). The final arrival position is set to a position preferable for preventing submarines according to various documents and other materials.

[Second Embodiment]
The vehicle seatbelt device 1 of the present embodiment is different from that of the first embodiment in the arrangement of the pretensioner unit 50, the structure for transmitting the driving force of the pretensioner unit 50 to the shaft 20, and the like. Hereinafter, these different parts will be mainly described (see FIG. 14 and the like).

In the present embodiment, the pretensioner unit 50 is arranged between the left side frame 12L and the right side frame 12R of the vehicle seat 10 at a position below the seat cushion (see FIG. 14). Further, a pulley 26 is provided on the shaft 20, and a wire (transmission member) 27 is wound around the pulley 26 (see FIG. 16). Further, the pipe 14 is provided with a through hole 14h for passing the wire 27 (see FIG. 17). In the present embodiment, the shaft 20 is rotated by pulling in the wire 27 by the pretensioner unit 50.

The pretensioner unit 50 functions as an actuator that serves as a power source for rotationally driving the shaft 20 around its central axis (transverse axis). In the present embodiment, a known Pyrotechnical Pretensioner that ignites gunpowder at the time of a vehicle collision and instantly rotates the shaft 20 by the generated gas pressure is adopted as the pretensioner unit 50. The outline of the pretensioner unit 50 of this embodiment will be described below (see FIG. 19). The pretensioner unit 50 includes a piston 56 driven by the gas pressure of a gas generator 51 generated by ignition of explosives in an emergency, and a cylinder 57 slidably accommodating the piston 56. The end of the wire 27 is connected to the piston 56. When a vehicle collision is detected by a collision sensor (not shown) or the like, high-pressure gas injected from the gas generator 51 is supplied into the cylinder 57, the piston 56 slides, and the wire 27 is pulled in. The wire 27 transmits a driving force to rotate the shaft 20.

Such a pretensioner unit 50 may be attached and fixed to, for example, a frame 13 as a structural material connecting the left side frame 12L and the right side frame 12R of the vehicle seat 10. In the present embodiment, the pretensioner unit 50 is fixed to the frame 13 by using a fixture 58 including a bracket 58b, bolts, nuts, and the like (see FIG. 14).

The position of the pulley 26 and the arrangement of the pretensioner unit 50 can be changed within a range in which the desired rotational operation of the shaft 20 using the pretensioner unit 50 is realized. Within this range, the position of the pulley 26 may be changed along the axial direction of the shaft 20, or the orientation of the pretensioner unit 50 may be changed and fixed (see FIG. 15).

The vehicle seatbelt device 1 according to each of the embodiments described so far has the following features.
-In the event of a vehicle collision, the shaft 20 is rotated by a predetermined amount to move the attachment point of the lap anchor 30 and the attachment point of the buckle 40 forward and downward from the position before the collision, and the position of the seat belt 2 is lowered to lower the occupant. Even when M is in a reclining posture (for example, the back angle is 48 ° with respect to the vertical), it is possible to suppress the occurrence of the submarine phenomenon.
-Since the structure is such that the lap anchor 30 and the buckle 40 move at the same time in conjunction with the rotational movement of the shaft 20, the pelvic (iliac) Mp of the occupant M is always stable compared to the case where both movements are not linked. It is possible to restrain.
-Since each member mechanically connected by a bar member (combination of the shaft 20 and the left and right moving arms 32, 42) formed in a U shape is interlocked, a relatively simple and robust structure can be obtained. Easy to build.
-By moving the lap anchor 30 and the buckle 40 in an arc shape (or in a trajectory close to an arc), it is easy to smoothly move the seat belt 2 with respect to the pelvis Mp of the occupant M. This is preferable in that, for example, even an occupant M whose abdomen is extremely large can easily realize such a movement.

Although the above-described embodiment is an example of a preferred embodiment of the present invention, the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention. For example, the completion time (Tend) of the movement operation of the lap anchor 30 and the buckle 40 does not necessarily have to be after the collision, and the lap anchor 30 and the buckle 40 may be operated in the pre-crash region before the collision actually occurs. Considering this point, it is possible to use a motor, a mechanical spring, or the like as the pretensioner unit 50 in addition to the explosive type actuator such as the Pyrotechnical Pretensioner as described above.

Further, in the above-described embodiment, the pretensioner unit 50 that rotates the pinion 21 by a plurality of balls 52 driven by the gas pressure of the gas generator 51 has been described, but this is only a suitable example. Although not particularly shown, for example, a pretensioner unit having a configuration in which the teeth of a rack that directly moves by gas pressure are engaged with the pinion 21 to drive the pinion 21 may be adopted.

As stated in the literature (for example, Japanese Patent Application Laid-Open No. 2019-098840), it is known that the shoulder belt inner tension is reduced by moving the belt anchor position attached to the seat structure forward during a collision. ing. Since this shoulder belt inner tension generally has a large correlation with the chest deflection amount, it is possible to reduce the chest deflection amount as a result by reducing the shoulder belt inner tension. Therefore, also in the above embodiment, similarly, moving the anchor position forward during the collision contributes to the reduction of the shoulder belt inner tension, and thus it is possible to finally contribute to the reduction of the chest deflection amount.

Further, in the above-described embodiment, the moving arms 32 and 42 are used to move at least a part (specifically, a pin-coupled portion) of the lap anchor stay 31 and the buckle stay 41 along an arc, whereby the lap anchor 30 is moved. The form in which the buckle 40 and the buckle 40 are moved in an arc shape (or in a trajectory close to an arc) is shown, but this is also only a suitable example. For example, a member other than the moving arm (link lever) may be used to move the lap anchor 30 and the buckle 40 in an arc shape (or a locus close to an arc) in the same manner. Although not shown in particular, for example, an arc-shaped guide that defines the movement locus of the lap anchor stay 31 and the buckle stay 41 is provided, and the lap anchor stay 31 and the buckle stay 41 are pulled and guided using a wire. It is conceivable to move it along the line.

A simulation model of a vehicle seatbelt device 1 that rotates a bar member (combination of a shaft 20 and left and right moving arms 32, 42) by an angle (90 ° as an example) to reach a predetermined final arrival position. It was prepared and various studies were conducted. In setting the final arrival position, the literature (Reference [1] Leung, Y., Tarriere, C., Lestrelin, D., Got, C. et al., "Submarining Injuries of 3 Pt. Belted Occupants in Frontal Collisions" --Description, Mechanisms and Protection, "SAE Technical Paper 821158, 1982, DOI:
https://doi.org/10.4271/821158, Reference [2] John D. Horsch and William E. Hering, “A Kinematic Analysis of Lap-Belt Submarining for Test Dummies” SAE Technical Paper 892441, 1989, DOI: https: Refer to //doi.org/10.4271/892441) and set the preferred position for submarine prevention. As a result, it was confirmed by numerical simulation using a human body model that submarine can be prevented even when the occupant M is in the above-mentioned recline posture of 48 °.

The preferred movement modes of the lap anchor 30 and the buckle 40 in the above simulation are as follows.
t0: Collision start timing
Tend ≤ 50ms [ms]: Confirmed by CAE simulation using a human body model for numerical calculation with a physique equivalent to that of an average adult male (movement should be completed by about 50ms after the collision). The Tend can be negative time (ie, it may move during a pre-crash before the actual collision).
R = 60 ± 20 [mm]: AM50 (Anthropomorphic Male 50th percentile) The downward movement of the pelvic Mp at the time of 56kmp front collision of the human body model was about 60mm (however, the seat). Different hardness will require different values; for example, it is easy to speculate that a softer sheet will require more radius of gyration (R)), and prevent submarines. It was calculated so as to be a preferable lap belt geometry condition for the above.
θ = 90 [deg]); The bar member is preferably rotated 90 °. It was confirmed by numerical simulation using a human body model that the submarine can be prevented even if the occupant M takes the above-mentioned recline posture of about 48 ° by setting these R and θ.

A test was conducted to confirm the effect of the vehicle seatbelt device 1 by CAE simulation using a human body model. Under the 56kph frontal collision thread condition, the evaluation was made with the above-mentioned 48 ° occupant recruitment attitude, which tends to cause the submarine phenomenon. Here, the presence or absence of submarines was confirmed by dynamic analysis, and the following submarin predictors were evaluated by static analysis (moving the belt without applying a collision pulse) (see FIGS. 20 to 21).
・ Submarine index “ξ” (the higher the value, the harder it is to submarine)
・ The angle "BTP (Belt-to-Pelvis)" formed by the pelvic Mp and the lap belt (the lower the value, the harder it is to submarine).

As a result of the above analysis, the submarine phenomenon occurred in the conventional technique (Conventional), but the submarine phenomenon did not occur in the vehicle seatbelt device 1 according to the present application (see FIGS. 22, 24, and 25). In FIG. 22 (and FIG. 23), "Inner" represents the inner buckle side (that is, the side where the buckle 40 is located), and "outer" represents the outer lap side (that is, the side where the lap anchor 30 is located). Although it may be a little difficult to see, in FIGS. 24 (B) and 25 (B), the movement of the pelvic Mp immediately after the collision (t = 50 ms) and the movement of the lap anchor 30 or the buckle 40 are indicated by arrows (Fig.). 24, see FIG. 25). In these figures, in order to improve visibility, the lumbar region hides soft tissues and the like, and the pelvis is displayed as a skeleton.

Further, for all submarine predictors, that is, the submarine indicator ξ (ξ indicator: higher is preferable) and BTP angle (Belt-to-Pelvis angle: lower is better), the vehicle according to the present application. It was confirmed that in the seatbelt device 1 for use, the numerical value is improved (the submarine is less likely to occur) as compared with the conventional technique (Conventional) (see FIGS. 22 and 23). From this, it was confirmed that the vehicle seatbelt device 1 according to the present application has a submarine suppressing effect. It was also confirmed that the amount of movement of the pelvic Mp was significantly reduced to 190 mm in the vehicle seatbelt device 1 according to the present application, as compared with the conventional technique (221 mm).

The present invention is suitable for application to a vehicle seatbelt device in a vehicle seat with an integrated seatbelt.

1 ... Vehicle seat belt device, 2 ... Seat belt, 2a ... Shoulder belt, 2b ... Wrap belt, 2e ... Seat belt end, 2t ... Tongue, 10 ... Vehicle seat, 11 ... Seat back frame, 12L ... Left Side frame, 12R ... Right side frame, 13 ... Frame, 14 ... Pipe, 14h ... Through hole, 15 ... Color, 20 ... Shaft, 20h ... Non-circular shaft part, 20s ... Screw part, 21 ... Pinion, 21a ... Non-circular Hole, 23s ... Screw nut 23w ... Washer, 26 ... Pulley, 27 ... Wire (transmission member), 30 ... Wrap anchor, 31 ... Wrap anchor stay, 31a ... Wrap anchor stay pin hole (mounting point), 32 ... Moving arm (Lap anchor side link), 32a ... non-circular hole, 32b ... pin hole, 33b ... rivet base, 33h ... rivet head, 36 ... stopper base, 36a ... pin hole, 36b ... mounting screw, 37 ... share pin (holding member) , 37a ... Small diameter part, 38 ... Stopper, 38a ... Mounting screw, 40 ... Buckle, 41 ... Buckle stay, 41a ... Pin hole (mounting point), 42 ... Moving arm (Rivet anchor side link), 42a ... Non-circular hole , 42b ... pin hole, 43b ... rivet base, 43h ... rivet head, 46 ... stopper base, 46a ... pin hole, 46b ... mounting screw, 47 ... share pin (holding member), 47a ... small diameter part, 48 ... stopper, 48a ... Mounting screw, 50 ... Pretensioner unit (actor), 51 ... Gas generator, 52 ... Ball (transmission member), 53 ... Tube, 54 ... Ball receiver, 56 ... Piston, 57 ... Cylinder, 58 ... Fixture, 58b ... Bracket, 61 ... Left base plate, 62 ... Pretensioner unit cover, 65 ... Right base plate, 66 ... Cover, C ... Rotating shaft, M ... Crew, Mp ... Pelvic

Claims (15)

A vehicle seatbelt device for vehicle seats with integrated seatbelts.
A shaft provided so as to be rotatable in the front-rear direction around a rotation axis extending in the width direction of the vehicle seat, and
A lap anchor stay of the lap anchor that holds the end portion of the seat belt, and a lap anchor stay that moves in conjunction with the rotational movement of the shaft.
A buckle stay for which the tongue of the seat belt can be attached, and a buckle stay that moves in conjunction with the rotational movement of the shaft.
An actuator that serves as a power source for driving the shaft to rotate around the rotation axis,
Equipped with
A vehicle seatbelt device that rotates the shaft by a predetermined amount to move the lap anchor and the buckle forward and downward from the position in front of the vehicle emergency in the event of a vehicle emergency. The vehicle seatbelt device according to claim 1, further comprising a lap anchor side link attached to one side of the shaft. The vehicle seatbelt device according to claim 2, wherein the lap anchor stay is pin-coupled to the lap anchor side link. The vehicle seatbelt device according to claim 2 or 3, further comprising a buckle anchor side link attached to the other side of the shaft. The vehicle seatbelt device according to claim 4, wherein the buckle stay is pin-coupled to the buckle anchor side link. The vehicle seatbelt device according to claim 3, further comprising a stopper that directly or indirectly regulates the movable range of the lap anchor. The vehicle seatbelt device according to claim 5, further comprising a stopper that directly or indirectly regulates the movable range of the buckle. The vehicle seatbelt device according to any one of claims 1 to 7, further comprising a holding member that holds one or both positions of the lap anchor stay and the buckle stay in the initial position. The vehicle seatbelt device according to claim 8, wherein the holding member is a member that releases a state in which one or both of the lap anchor stay and the buckle stay are held by receiving a load acting in an emergency of the vehicle. The vehicle seatbelt device according to any one of claims 1 to 9, wherein the shaft is provided in a hollow portion of a pipe connected to both side frames of the vehicle seat. The vehicle seatbelt device according to any one of claims 1 to 10, wherein the actuator is a pretensioner unit that ignites explosives in an emergency of a vehicle and instantly rotates the shaft with the generated gas pressure. The vehicle seatbelt device according to claim 11, wherein the pretensioner unit includes a transmission member that transmits a rotational driving force to a pinion provided on the shaft by utilizing the gas pressure generated by the explosive ignition. The vehicle seat according to any one of claims 1 to 10, wherein the actuator is a pretensioner unit that ignites gunpowder in an emergency of a vehicle and instantly pulls a wire with the generated gas pressure to rotate the shaft. Belt device. The vehicle seatbelt device according to claim 13, wherein the shaft is provided with a pulley around which the wire is wound. The vehicle seatbelt device according to claim 14, wherein the pipe is provided with a through hole through which the wire is passed.

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