JP2010058722A - Occupant restraint system for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an occupant restraint system for a vehicle capable of securing occupant restraining performance required in a collision while reducing incongruity and oppressive feeling in normal attaching of a webbing. <P>SOLUTION: A vehicular seat belt device 10 includes a pair of right and left shoulder webbings 12A restraining an upper body of an occupant, a pair of right and left shoulder webbing guides 20 protruded toward the seat front from an upper end of a seat back 16 and having webbing guide parts 20A wound by upper ends of the shoulder webbings 12A respectively, and a guide drive mechanism 40 that can change the distance between the webbing guide parts 20A in the seat width direction. The guide drive mechanism 40 is configured to bring the right and left webbing guide parts 20A closer than in a normal attaching state when a vehicle collision is detected or expected. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle occupant restraint device for restraining an occupant seated on a seat at the time of a collision to the seat.

A belt guide disposed on the shoulder portion of the seat back is configured to be supported by the seat back so as to be pivotable between a normal position where the seat belt can restrain the occupant and an open position behind the normal position. A point-type vehicle seat belt device is known (see, for example, Patent Document 1).
Japanese Unexamined Patent Publication No. 1-94053 JP 2000-16238 A JP 2007-210435 A

  However, the conventional technology as described above is simply configured to switch the seat belt attachment / detachment position with respect to the occupant, and there is room for improvement from the viewpoint of reducing a sense of discomfort and pressure when the occupant is wearing the seat belt. .

  An object of the present invention is to obtain a vehicle occupant restraint device that can secure a required occupant restraint performance in a collision while reducing a sense of incongruity and pressure when wearing a normal webbing.

  The vehicle occupant restraint device according to the first aspect of the present invention includes a body restraint webbing for restraining the occupant's upper body, a front part of the seat back that protrudes forward from the seat, and the body restraint webbing A webbing guide having a winding part on which the upper end side is wound, and a guide driving mechanism for displacing the winding part of the webbing guide to the center side in the width direction of the seat cushion when a vehicle collision is detected or predicted; It has.

  2. The vehicle occupant restraint device according to claim 1, wherein the upper end side of the upper body restraining webbing is wound around a webbing guide wrapping portion having at least a front end protruding forward of the seat cushion. The webbing is attached to the upper body of the seated occupant. Here, in this vehicle occupant restraint device, when the applied vehicle collision is detected or predicted, the guide drive mechanism displaces the winding portion of the webbing guide toward the center in the seat width direction. The hooked portion, that is, the upper end of the upper body restraining webbing can be in a mounted state in which the upper end is positioned relatively outside in the seat width direction.

  For this reason, at the normal time, it is possible to reduce the feeling of pressure and discomfort due to the webbing guide protruding forward of the seat back. On the other hand, in the event of a vehicle collision, the required occupant restraint performance by the upper body restraining webbing can be exhibited by moving the winding portion to the proper restraint position inward in the vehicle width direction.

  Thus, in the vehicle occupant restraint device according to the first aspect, the required occupant restraint performance can be ensured at the time of a collision while reducing the uncomfortable feeling and the feeling of pressure at the time of wearing the normal webbing. Further, for example, if the webbing guide wrapping portion is positioned forward of the occupant's shoulder, the feeling of wrapping the webbing around the occupant's shoulder can be reduced.

  A vehicle occupant restraint device according to a second aspect of the invention includes a pair of left and right upper body restraining webbings for restraining an occupant's upper body, a front portion of a seat back projecting forward of the seat, and the upper body The distance in the sheet width direction between the pair of left and right webbing guides having a winding part around which the upper end side of the restraining webbing is wound and the winding part of the pair of left and right webbing guides when a vehicle collision is detected or predicted Is provided with a guide drive mechanism that shortens the distance from the normal state.

  3. The vehicle occupant restraint device according to claim 2, wherein the upper end side of the upper body restraining webbing is wound around a winding portion of a webbing guide having at least a front end protruding forward of the seat cushion. The webbing is attached to the upper body of the seated occupant. Here, in this vehicle occupant restraint device, when the applied vehicle collision is detected or predicted, the guide driving mechanism shortens the interval between the winding portions of the left and right webbing guides. It can be set as the mounting state which spaced apart the winding part of the sheet | seat in the sheet | seat width direction.

  For this reason, at the normal time, it is possible to reduce the feeling of pressure and discomfort due to the webbing guide protruding forward of the seat back. On the other hand, in the event of a vehicle collision, the required occupant restraint performance by upper body restraining webbing can be exhibited by moving the left and right winding parts to each other, that is, to an appropriate restraint position close to the occupant side. it can.

  Thus, in the vehicle occupant restraint device according to the second aspect, the required occupant restraint performance can be ensured at the time of a collision while reducing the uncomfortable feeling and the feeling of pressure when wearing the normal webbing. Further, for example, if the webbing guide wrapping portion is positioned forward of the occupant's shoulder, the feeling of wrapping the webbing around the occupant's shoulder can be reduced.

  The vehicle occupant restraint device according to a third aspect of the present invention is the vehicle occupant restraint device according to the first or second aspect, wherein the webbing guide is mounted to project the winding portion forward of the seat back. The guide drive mechanism is configured to be capable of taking a position and a retracted position stood on the seat back so that the winding portion is located on the upper side, and the guide driving mechanism is configured so that the webbing guide is located at the mounting position. By reciprocating the wrapping portion in the sheet width direction, the position of the wrapping portion is a normal mounting position that is relatively located on the outer side in the sheet width direction and an emergency that is positioned on the inner side in the sheet width direction relative to the normal mounting position. It is set as the structure which can be switched to either one at the time mounting position.

  In the vehicle occupant restraint device according to the third aspect, since the webbing guide is located in the retracted position when not used (not seated), the upper body restraint webbing and the webbing guide are prevented from hindering the passenger from getting on and off. When the seated occupant wears the upper body restraining webbing, the winding portion of the webbing guide is positioned at the normal wearing position, which contributes to reducing the occupant's feeling of pressure and discomfort, and the guide drive mechanism It is contributed to exhibiting a required passenger | crew restraint performance by moving to the time mounting position (it adjoins mutually). In this vehicle occupant restraint device, the guide drive mechanism can reciprocate the winding portion of the webbing guide, so that it can be quickly moved to the emergency mounting position when a collision is predicted, and if the collision is avoided, the webbing The winding portion of the guide can be returned to the normal mounting position.

  A vehicle occupant restraint device according to a fourth aspect of the present invention is the vehicle occupant restraint device according to the first or second aspect, wherein the webbing guide is mounted to project the winding portion forward of the seat back. The guide drive mechanism is configured to be able to take a position and a retracted position standing on the seat back so that the winding part is located on the upper side. The wrapping portion of the webbing guide located at the mounting position is irreversibly displaced inward in the sheet width direction.

  In the vehicle occupant restraint device according to the fourth aspect, since the webbing guide is located at the retracted position when not used (not seated), the upper body restraint webbing and the webbing guide are prevented from hindering the passenger from getting on and off. When a vehicle collision is detected or predicted with the seated occupant wearing the upper body restraining webbing, the winding portion of the webbing guide is displaced inward in the seat width direction with respect to the mounting position by the guide drive mechanism. The required occupant restraint performance can be exhibited in the event of a vehicle collision. For this reason, the mounting position of the webbing guide can be set to the outer side in the seat width direction relative to the position at the time of the collision, which contributes to reducing the feeling of pressure and discomfort of the occupant by the webbing guide and webbing. . Further, since the guide driving mechanism is configured to irreversibly displace the webbing guide from the mounting position, the structure can be simplified.

  The vehicle occupant restraint device according to the invention described in claim 5 is the vehicle occupant restraint device according to any one of claims 1 to 4, wherein the guide driving mechanism is supported by the webbing guide on the seat back. By rotating around the part, the winding part is displaced in the sheet width direction.

  In the vehicle occupant restraint device according to claim 5, the webbing guide in a state in which the winding portion protrudes forward of the seat back rotates around the support portion (near the rear end) to the seat back. The winding portion located on the front end side is displaced in the sheet width direction. For this reason, the winding part can be displaced relatively large in the sheet width direction with a simple structure.

  As described above, the vehicle occupant restraint device according to the present invention has an excellent effect that the required occupant restraint performance can be ensured at the time of collision while reducing a sense of incongruity and pressure when wearing a normal webbing. .

(First embodiment)
A vehicle seat belt device 10 as a vehicle occupant restraint device according to a first embodiment of the present invention will be described with reference to FIGS. First, a schematic overall configuration of the vehicle seat belt device 10 (mainly related to a basic function as a four-point seat belt device) will be described, and then a guide drive mechanism 40 that is a waist portion of the present invention will be described in detail. I will do it. It should be noted that arrow FR, arrow UP, arrow IN, and arrow OUT that are appropriately shown in each figure indicate the seat width that coincides with the forward direction (traveling direction), upward direction, and vehicle width direction of the vehicle to which the vehicle seat belt device 10 is applied. The inner side and the outer side of the direction are respectively shown, and these substantially coincide with the front direction, the upper direction, and the width direction of the vehicle seat 11 to which the vehicle seat belt device 10 is applied.

(Basic configuration as a 4-point seat belt device)
4A shows a front view of the vehicle seat 11 and the vehicle seat belt device 10 in a non-sitting state, and FIG. 4B shows a vehicle seat 11 in a non-sitting state. A vehicle seat belt device 10 is shown in a side view. Further, FIG. 5A shows a front view of the vehicle seat 11 and the vehicle seat belt device 10 in a webbing wearing state by a seated occupant, and FIG. 5B shows a webbing wearing state. A vehicle seat 11 and a vehicle seat belt device 10 are shown in a side view.

  As shown in these drawings, the vehicle seat belt device 10 includes a pair of left and right webbings 12 and is configured as a so-called four-point seat belt device. As shown in FIG. 4A, each webbing 12 is exposed along the vehicle vertical direction in a portion exposed when the webbing is not attached. As shown in FIG. 4B, each webbing 12 is angularly displaced about its axis along the vehicle width direction at the lower end of each webbing 12 through the anchor member 14 to the vehicle seat 11 (a seat cushion 18 described later). It is locked (coupled) so as to be able to follow the operation of a lap webbing guide 36 described later.

  On the other hand, the upper end sides of the pair of left and right webbings 12 are respectively folded back by a shoulder webbing guide 20 which will be described later, and are wound around an upper retractor 22 as a winding device provided in the seat back 16 so as to be retractable. Yes. The upper retractor 22 is provided in a pair of left and right webbings 12 corresponding to the pair of left and right webbings 12, and winds the webbing 12 corresponding to the left and right around a winding shaft that is slightly inclined in the vertical direction with respect to the vehicle width direction. . In addition, it is also possible to make it the structure which winds up the upper end side of the webbing 12 on either side with a common retractor. Moreover, it may replace with the anchor member 14 and may provide the retractor which winds up the lower end side of the webbing 12 on either side so that pulling out is possible.

  Further, the vehicle seat belt device 10 includes a buckle device 24 for detachably connecting the middle portions in the longitudinal direction of the left and right webbing 12. The buckle device 24 is mainly composed of a buckle 26 as a locked portion provided at a longitudinal intermediate portion of one webbing 12 and a tongue plate 28 as a locking portion that can be attached to and detached from the buckle 26. ing.

  The buckle 26 and the tongue plate 28 are attached to the inside through a slip joint 30 so as to be slidable in the longitudinal direction of the webbing 12. As a result, in the vehicle seat belt device 10, the buckle 26 and the tongue plate 28 can be coupled while pulling out the webbing 12 from the upper retractor 22. The buckle 26 and the tongue plate 28 are configured to be held (slip-prevented) at the upper end of a lap webbing guide 36 described later when the webbing 12 is not attached to the occupant. In the configuration in which the retractor that winds the lower end side of the left and right webbings 12 is provided in place of the anchor member 14 as described above, the buckle 26 and the tongue plate 28 are moved to predetermined positions in the middle part of the left and right webbings 12 (relative displacement does not occur). As well) may be provided.

  As shown in FIGS. 5 (A), 5 (B), and 6, the left and right webbings 12 are joined by the buckle device 24 (attached to the occupant) and are attached to the buckle device 24 (slip joint 30). Also, the upper part in the vehicle vertical direction is mainly a shoulder webbing 12A as a body restraining webbing, and the left and right anchor members 14 composed of the lower part and the buckle device 24 are connected to the shoulder webbing 12A (seat width) The portion extending in the direction is mainly the wrap webbing 12B.

  Further, the vehicle seat belt device 10 includes a pair of left and right shoulder webbing guides 20. As shown in FIG. 4A and FIG. 5A, the shoulder webbing guide 20 is provided in a pair of left and right corresponding to the pair of left and right webbings 12, and as shown in a side sectional view in FIG. The webbing 12 into which the corresponding webbing 12 is inserted is formed in a thin flat cylindrical shape in the thickness direction. The shoulder webbing guide 20 is made of, for example, a resin material.

  Each shoulder webbing guide 20 is supported by the upper end 16A of the seat back 16 via a guide drive mechanism 40, which will be described in detail later, at the lower end in the vehicle vertical direction when the webbing is not attached. On the other hand, a webbing guide serving as a winding part in which the webbing 12 inserted through the shoulder webbing guide 20 on the opposite side of the support side (base end part 20B) to the seatback 16 is folded (wound). Part 20A.

  The shoulder webbing guide 20 is rotated about an axis (described later) substantially along the sheet width direction, so that the storage position shown in FIGS. 4A and 4B and the position shown in FIG. And it is set as the structure which can take the mounting preparation position (webbing mounting position) shown by FIG. 5 (B). Specifically, as shown in FIGS. 4A and 4B, the posture of the shoulder webbing guide 20 taking the storage position is raised with respect to the upper end portion 16A of the seat back 16 and the webbing guide portion. The posture is inclined in front view so that 20A is positioned on the outer side in the sheet width direction from the base end portion 20B side.

  In this embodiment, the webbing guide portion 20 </ b> A of each shoulder webbing guide 20 that takes the storage position is located near the end portion in the width direction of the seat back 16 or outside in the seat width direction with respect to the seat back 16. Further, as shown in FIG. 4B, the webbing guide portion 20A of each shoulder webbing guide 20 taking the retracted position is located behind the front surface 16B and the front surface 34A of the headrest 34 near the upper end of the seat back 16 in the vehicle front-rear direction. Arranged on the side.

  On the other hand, as shown in FIGS. 5 (A) and 5 (B), the posture of the shoulder webbing guide 20 taking the mounting preparation position is laid down with respect to the upper end portion 16A of the seat back 16, and the webbing guide portion 20A is viewed from the side. Thus, the posture is positioned in front of the seated occupant P in the front-rear direction of the vehicle. In this posture, the webbing guide portion 20A is located above the shoulder of the seated occupant P in the vehicle vertical direction.

  Further, the vehicle seat belt device 10 includes a pair of left and right lap webbing guides 36. The lap webbing guide 36 is formed in a flat cylindrical shape that is flat in the thickness direction (sheet width direction) of the lower part of the webbing 12 in the retracted state, and is stored inside as shown in FIGS. 4 (B) and 5 (B). The lower part of the webbing 12 in the state, that is, the constituent part of the lap webbing 12B is inserted. The lap webbing guide 36 is supported by the seat frame of the vehicle seat 11 so as to be rotatable about an axis along the seat width direction with respect to the vehicle seat 11 via the motor actuator 38 in the vicinity of the lower end 36A. .

  The lap webbing guide 36 is rotated about the drive shaft of the motor actuator 38, so that the wrap webbing guide 36 is tilted substantially forward and the retracted storage position shown in FIGS. 4 (A) and 4 (B). The mounting preparation position (shown in FIGS. 5A and 5B showing the webbing mounting position) can be taken. In this embodiment, the lap webbing guide 36 is angularly displaced from the storage position side to the mounting preparation position side when the motor actuator 38 rotates forward, and is retracted from the mounting preparation position side when the motor actuator 38 rotates reversely. It is configured to be angularly displaced to the position side.

  As shown in FIGS. 4A and 4B, the posture of the lap webbing guide 36 taking the retracted position is an upright posture (slightly tilted posture) along the side surface of the seat back 16. In other words, each lap webbing guide 36 taking the storage position is disposed outside the seat back 16 in the width direction and behind the front surface 16C at the lower end of the seat back 16 in the vehicle front-rear direction. On the other hand, as shown in FIGS. 5 (A) and 5 (B), the lap webbing guide 36 in the mounting preparation position is inclined forward such that the upper end 36B is positioned on the front side in the vehicle longitudinal direction with respect to the lower end 36A. It is said that.

  As described above, in the vehicle seat belt device 10, when the shoulder webbing guide 20 and the lap webbing guide 36 take the respective retracted positions, the exposed portion of the webbing 12 is viewed from the front as a whole as shown in FIG. The seat back 16 is arranged on the outer side in the width direction, and is arranged so as to overlap the thickness range of the seat back 16 as a whole in a side view. That is, in the vehicle seat belt device 10, when the shoulder webbing guide 20 and the lap webbing guide 36 take their retracted positions, the left and right webbings 12 are positioned on the sides of the seat back 16 and the headrest 34, respectively. In FIG. 4 (A), the buckle 26 and the tongue plate 28 are visualized on the front side of the seat back 16 in order to visualize them, but actually these are also shown in FIG. 4 (B). It is arranged on the side of the seat back 16 as shown in FIG.

  Further, in this embodiment, the width of the upper end portion 16A of the seat back 16 is larger than the assumed shoulder width of the seated occupant P. Therefore, when each shoulder webbing guide 20 takes each storing position, the left and right webbings 12 are configured to be positioned outside the shoulder width of the seated occupant P, respectively. Accordingly, the vehicle seat belt device 10 is configured such that the webbing 12 is not positioned in the seating space and the boarding / exiting space when each shoulder webbing guide 20 takes the respective storage position.

  On the other hand, in the vehicle seat belt apparatus 10, when each shoulder webbing guide 20 takes the mounting preparation position, the shoulder of the seated occupant P between the front surface of the seat back 16 (including the front surface 16 </ b> B at the upper end) and the webbing 12. It is the structure in which the space which puts (upper body) is formed. When the vehicle seat belt device 10 joins the buckle 26 and the tongue plate 28 of the buckle device 24 with the shoulder of the seated occupant P in this space, the vehicle seat belt device 10 is shown in FIGS. 5 (A) and 5 (B). As shown, the webbing 12 is configured to be mounted on the seated occupant P.

  Further, in the vehicle seat belt device 10, the buckle 26 and the tongue plate 28 constituting the buckle device 24 are configured such that the position in the vehicle vertical direction in the retracted state is maintained by the upper end 36 </ b> B of the corresponding lap webbing guide 36. ing. In the vehicle seat belt device 10, when the lap webbing guide 36 is positioned at the mounting preparation position, the buckle 26 and the tongue plate 28 reach a position where they can be easily gripped by the hand of the seated passenger P. ing. Further, the lap webbing guide 36 is made of, for example, a resin material and has a flexibility in the flat direction. Therefore, when the buckle 26 of the buckle device 24 and the tongue plate 28 are coupled, the lap webbing guide 36 is bent toward the seated occupant P as shown in FIG. It is configured.

(Configuration of guide drive mechanism)
In the vehicle seat belt device 10, the shoulder webbing guide 20 can take the storage position and the mounting preparation position (or webbing mounting position) as described above. Further, in the vehicle seat belt device 10, the shoulder webbing guide 20 is in the state where the webbing mounting position as the mounting position is taken, and the normal mounting position shown by an imaginary line in FIG. 1 and the emergency mounting shown by a solid line. It is set as the structure which can be switched to a position.

  The vehicle seat belt device 10 includes a guide drive mechanism 40 for switching the shoulder webbing guide 20 between a normal mounting position and an emergency mounting position. In this embodiment, the guide drive mechanism 40 is configured to also serve as a function of switching the shoulder webbing guide 20 between a storage position and a mounting preparation position. This will be specifically described below. Note that the guide drive mechanism 40 is provided for each of the left and right shoulder webbing guides 20, but these left and right guide drive mechanisms 40 are basically configured symmetrically, so only one will be described.

  As shown in an exploded perspective view in FIG. 3, the guide drive mechanism 40 includes a base member 42 that is fixed to a seat back frame (not shown) that constitutes the anchor member 14. The base member 42 is provided on a cylindrical boss portion 44 that opens substantially upward in the vehicle vertical direction, a pair of arm portions 46 that extend upward on both sides of the boss portion 44 in the seat width direction, and upper ends of the arm portions 46. The stopper 48 is a main part.

  The guide drive mechanism 40 includes a vertical shaft 50 that is rotatably supported by the base member 42 via a bearing 45 that is, for example, a ball bearing. In the bearing structure 52 provided at the upper end of the vertical shaft 50, the left and right shafts 54 provided on the proximal end portion 20B side of the shoulder webbing guide 20 are separated from each other at a plurality of positions (this is separated from each other in the axial direction of the left and right shafts 54). In the embodiment, it is rotatably supported at two locations).

  Accordingly, the left and right shafts 54 are configured to rotate following the rotation of the vertical shaft 50 when the vertical shaft 50 rotates around the axis. Further, in this embodiment, the left and right shaft 54 spans a pair of left and right flanges 20C extending downward from the base end portion 20B (downward at the mounting preparation position) in FIG. It is fixedly provided so as to rotate integrally with the guide 20.

  As described above, in the guide drive mechanism 40, the shoulder webbing guide 20 is rotated about the left and right axis 54 to switch the storage position and the mounting preparation position (webbing mounting position), and the shoulder webbing guide 20 is rotated about the vertical axis 50. By doing so, the normal mounting position and the emergency mounting position are switched.

  Further, in this embodiment, as shown in FIG. 3, the shoulder webbing guide 20 is inclined with respect to a direction orthogonal to the axis of the left and right shaft 54 (front-rear direction and vertical direction). Thus, the shoulder webbing guide 20 is configured such that the webbing guide portion 20A is positioned near or outside the outer end of the seat back 16 in the seat width direction as described above in the retracted position. Further, the shoulder webbing guide 20 that rotates integrally with the inclined posture with respect to the left and right shafts 54 is shifted from the retracted position around the left and right shafts 54 by a predetermined angle to be shifted to the normal mounting position.

  Further, both ends of the left and right shafts 54 in the axial direction are inserted into corresponding stopper portions 48 of the base member 42, and the inner end in the sheet width direction of the left and right shafts 54 of the stopper portion 48 on the inner side in the sheet width direction at the normal mounting position. A second stopper which is engaged with the first stopper wall 48A (see FIG. 3) which is the front wall and the outer end in the seat width direction of the left and right shaft 54 is the front wall of the stopper portion 48 on the outer side in the seat width in the emergency mounting position. It is adapted to be engaged with the wall 48B. Thus, the shoulder webbing guide 20 is prevented from rotating beyond the normal mounting position and the emergency mounting position.

  2 and 3, the guide drive mechanism 40 includes a first drive motor 56 for driving the shoulder webbing guide 20 between the retracted position and the mounting preparation position (normal mounting position), and the shoulder. A second drive motor 58 for driving the webbing guide 20 between the normal mounting position and the emergency mounting position is provided.

  The first drive motor 56 transmits power around the left and right shafts 54 to the shoulder webbing guide 20 via a driven gear 60 provided between a pair of left and right flanges 20C on the left and right shafts 54. In this embodiment, the drive gear 62 and the driven gear 60 provided on the rotation shaft of the first drive motor 56 are meshed with the idler gear 64, whereby the power of the first drive motor 56 is transmitted to the shoulder webbing guide 20. It is set as the structure. The driven gear 60 is long in the axial direction with respect to the drive gear 62, and a predetermined angular range in which the shoulder webbing guide 20 rotates about the vertical axis 50 (an angle for switching between a normal mounting position and an emergency mounting position). (Range), the meshing with the idler gear 64 supported by the seat back 16 (seat back frame) (the power transmission path from the first drive motor 56) is maintained.

  The second drive motor 58 is configured to transmit power around the vertical shaft 50 to the shoulder webbing guide 20 via a driven gear 66 provided at an intermediate portion of the vertical shaft 50. In this embodiment, the drive gear 68 provided on the rotation shaft of the second drive motor 58 is engaged with the driven gear 66 so that the power of the second drive motor 58 is transmitted to the shoulder webbing guide 20. ing. Although not shown, the second drive motor 58 is supported by the seat back 16 (seat back frame).

  In the guide drive mechanism 40 described above, when the first drive motor 56 rotates in the forward direction, the shoulder webbing guide 20 is rotated around the left and right shafts 54 from the storage position side to the mounting preparation position side, and the first drive motor 56 rotates in the reverse direction. As a result, the shoulder webbing guide 20 is rotated about the left and right shafts 54 from the mounting preparation position side to the storage position side. Further, in the guide drive mechanism 40, when the second drive motor 58 rotates forward, the shoulder webbing guide 20 is rotated about the vertical axis 50 from the normal mounting position side to the emergency mounting position side, and the second driving motor 58 is reversed. By rotating, the shoulder webbing guide 20 is rotated about the vertical axis 50 from the emergency mounting position side to the normal mounting position side.

  Further, as shown in FIG. 2, the vehicle seat belt device 10 includes an ECU 70 as a control unit for controlling the operation of the first drive motor 56 and the second drive motor 58. The ECU 70 is electrically connected to each of a seating sensor 72, a first drive motor 56, and a second drive motor 58 as seating detection means. In this embodiment, the ECU 70 is also electrically connected to the motor actuator 38.

  When the signal corresponding to the seated occupant P sitting on the vehicle seat 11 is input from the seating sensor 72, the ECU 70 moves the shoulder webbing guides 20 and the lap webbing guides 36 from the respective storage positions to the mounting preparation positions. The first drive motor 56 and the motor actuator 38 are controlled to rotate forward so as to be displaced to the (normal mounting position).

  In the vehicle seat belt device 10, the ECU 70 is also electrically connected to a buckle sensor 74 that is built in the buckle device 24 (buckle 26) and outputs at least a signal corresponding to the release of the buckle device 24. . When the signal corresponding to the release of the coupling of the buckle device 24 is input from the buckle sensor 74, the ECU 70 moves the shoulder webbing guide 20 and the lap webbing guide 36 from the respective mounting preparation positions to the storage positions. Control is performed to reversely rotate the first drive motor 56 and the motor actuator 38 so as to be displaced.

  Further, the ECU 70 is electrically connected to a radar 78 serving as a forward monitoring unit for monitoring the front of the vehicle via a DSS (driver support system) 76 serving as a collision determination unit. The radar 78 outputs a signal corresponding to the distance to the obstacle ahead of the vehicle, and the DSS 76 predicts a frontal collision (probability) based on the signal from the radar 78 (time change thereof). It is configured.

  The ECU 70 corrects the second drive motor 58 so that the shoulder webbing guide 20 is displaced from the normal mounting position to the emergency mounting position when a signal corresponding to the predicted frontal collision is input from the DSS 76. Control to rotate is performed. On the other hand, when the signal corresponding to the front collision is avoided from the DSS 76, the ECU 70 causes the second drive motor so that the shoulder webbing guide 20 is returned from the emergency mounting position to the normal mounting position. Control is performed to reversely rotate 58. In this embodiment, the DSS 76 is built in the seat back 16 (not shown). For example, the function of the ECU 70 is integrated into an ECU that controls the operation of the upper retractor 22 and an airbag device (not shown). Also good.

  The vehicle seat belt device 10 described above can be applied to each vehicle seat 11 such as a driver seat, a passenger seat, and a rear seat (second row or the third row and thereafter).

  Next, the operation of the first embodiment will be described.

  In the vehicle seat belt device 10 having the above-described configuration, the left and right shoulder webbing guides 20 and the lap webbing guides 36 are shown in FIGS. 4A and 4B when the occupant is not seated on the applied vehicle seat 11. ) As shown in FIG. Therefore, the exposed portions of the left and right webbings 12 are positioned on the sides of the seat back 16. That is, in a non-sitting state of the occupant on the vehicle seat 11 (before being seated on the vehicle seat 11 and after the webbing 12 is released), the webbing 12 is retracted from the occupant's getting-on / off space. Therefore, in the vehicle to which the vehicle seat belt device 10 is applied, it is easy for passengers to get on and off the vehicle seat 11.

  In the vehicle seat belt device 10, when an occupant is seated on the vehicle seat 11 from a state in which the left and right shoulder webbing guides 20 and the lap webbing guide 36 are located at the retracted position, a signal corresponding to the seating from the seating sensor 72 to the ECU 70. Is entered. The ECU 70 to which this signal is input causes the first drive motor 56 and the motor actuator 38 to rotate forward by a predetermined amount. Then, the left and right shoulder webbing guides 20 and the lap webbing guides 36 are moved to the respective mounting preparation positions.

  By moving the shoulder webbing guide 20 from the retracted position to the mounting preparation position (normal mounting position), the webbing guide portion 20A is placed outside the width of the shoulder of the seated occupant P (occupant) and from the rear upper side of the shoulder. Displaced to the upper front side of the shoulder. Further, by moving the lap webbing guide 36 from the retracted position to the mounting preparation position, the buckle 26 and the tongue plate 28 held in the vicinity of the upper end 36B of the lap webbing guide 36 reach a position where they can be easily gripped by the seated occupant P. When the seat occupant P joins the buckle 26 and the tongue plate 28, the webbing 12 is mounted on the seat occupant P as shown in FIGS. 5 (A) and 5 (B). That is, the shoulder webbing 12 </ b> A slightly restrains the upper body of the seated occupant P, and the lap webbing 12 </ b> B restrains the waist of the seated occupant P.

  Thus, since the vehicle seat belt device 10 includes the shoulder webbing guide 20 that can take the storage position and the mounting preparation position, the webbing 12 is placed on the shoulder of the seated occupant P from the outside of the seating space of the seated occupant P. Can be moved in front of. That is, the webbing 12 can be moved in front of the shoulder without interfering (hanging) with the seated occupant P, and the seatback 16 from the front of the shoulder without interfering (hanging) with the seated occupant P. Can be retracted to the side. Moreover, in the vehicle seat belt device 10, the ECU 70 automatically moves the left and right shoulder webbing guides 20 from the respective storage positions to the mounting preparation positions based on the signal of the seating sensor 72, so that the seated occupant P moves to the webbing 12. Preparation for mounting is performed without touching, and the seated person can easily mount the webbing 12 only by connecting the buckle device 24.

  On the other hand, when the seated occupant P releases the coupling of the buckle device 24, a buckle release signal is input from the buckle sensor 74 to the ECU 70. Each lap webbing guide 36 returns from the curved state constituting the lap webbing 12B by its own restoring force, and moves the buckle 26 and the tongue plate 28 to the outside in the width direction of the vehicle seat 11.

  When a signal from the buckle sensor 74 is input, that is, when it is estimated that the seated occupant P gets out of the vehicle, the ECU 70 rotates the first drive motor 56 and the motor actuator 38 backward by a predetermined amount. Then, the left and right shoulder webbing guides 20 are returned from the respective mounting preparation positions to the storage positions, and the left and right lap webbing guides 36 are returned from the respective mounting preparation positions to the storage positions. As the shoulder webbing guide 20 moves from the mounting preparation position to the retracted position, the webbing guide portion 20A is displaced from the upper front side of the seated occupant P to the outside of the shoulder width of the seated occupant P and to the upper rear side of the shoulder. . Thereby, the wearing of the webbing 12 by the seated occupant P is released.

  As described above, in the vehicle seat belt device 10, when the uncoupling of the buckle device 24 is detected by the buckle sensor 74, the ECU 70 moves the left and right shoulder webbing guides 20 from the respective mounting preparation positions to the storage positions. After the buckle device 24 is released, the seating occupant P is automatically released without touching the webbing 12.

  In the vehicle seat belt device 10, when the frontal collision of the applied automobile is predicted by the DSS 76 with the left and right webbing 12 mounted by the seated occupant P (the collision probability exceeds the threshold value), the ECU 70 Then, the second drive motor 58 is rotated forward. Then, in each shoulder webbing guide 20, the left and right webbing guide portions 20A are displaced inward in the seat width direction as shown in FIGS. 1 and 6, and the shoulder webbing 12A is properly attached to the seated occupant P. In this state, when the vehicle reaches a frontal collision, the locking mechanism and the pretensioner of the upper retractor 22 are operated, the pull-out of the shoulder webbing 12A is restricted, and the shoulder webbing 12A is forcibly taken up. It is restrained appropriately by the vehicle seat 11. That is, required occupant restraint performance is exhibited.

  On the other hand, in the vehicle seat belt device 10, when the DSS 76 detects the applied automobile collision avoidance, the ECU 70 reversely rotates the second drive motor 58. Then, each shoulder webbing guide 20 returns to the normal mounting position.

  Here, in the vehicle seat belt device 10, when a frontal collision of the applied vehicle is predicted, the guide drive mechanism 40 moves the webbing guide portion 20 </ b> A of the shoulder webbing guide 20 to the inner side in the seat width direction (on the seating occupant P side). In other words, since the distance along the seat width direction of the left and right webbing guide portions 20A is shortened, the left and right webbing guide portions 20A are usually separated from the seat occupant P in the seat width direction. It can be made the attached state. For this reason, at the normal time, it is possible to reduce the feeling of pressure or discomfort due to the shoulder webbing guide 20 protruding forward from the seat back 16. Further, it is possible to prevent the face of the seated occupant from interfering with the shoulder webbing guide 20 when the seated occupant P looks back.

  On the other hand, when a frontal collision of the vehicle is predicted, the required occupant restraint performance by the shoulder webbing 12A is exhibited by moving the left and right webbing guide portions 20A to the proper restraint positions close to each other, that is, the occupant side. can do.

  As described above, in the vehicle seatbelt device 10 according to the first embodiment, the four-point seatbelt device includes the shoulder webbing guide 20 for securing the boarding / exiting property with respect to the vehicle seat 11, when the webbing is mounted. The required passenger restraint performance can be ensured at the time of a frontal collision while reducing the sense of discomfort and pressure. That is, it is possible to reduce both the feeling of pressure and discomfort by the shoulder webbing guide 20 during normal wearing and the securing of occupant restraint performance by the left and right webbing 12 during a frontal collision.

  In the vehicle seat belt device 10, the webbing guide portion 20 </ b> A of the shoulder webbing guide 20 is positioned in front of the shoulder of the seated occupant P at the normal wearing position as described above, and thus the webbing 12 is wound around the shoulder of the seated occupant P. The feeling of pressure (feeling of winding) by the webbing 12 of the seated occupant P is small.

  Since the webbing guide portion 20A is thus positioned in front of the shoulder of the seated occupant P, the shoulder webbing 12A and the shoulder webbing 12A are displaced by the displacement between the normal mounting position and the emergency mounting position of the shoulder webbing guide 20 described above. It is possible to prevent the seated occupant P from rubbing and catching clothes. As a result, the shoulder webbing 12A is smoothly moved in accordance with the displacement between the normal mounting position of the shoulder webbing guide 20 and the emergency mounting position.

  In the vehicle seat belt device 10, the shoulder webbing guide 20 can reversibly take the normal mounting position and the emergency mounting position by the guide driving mechanism 40, so that it can be promptly (relatively low collision probability) when the front collision is predicted by the DSS 76. The shoulder webbing guide 20 can be moved to the emergency mounting position. When the frontal collision is avoided, the shoulder webbing guide 20 can be returned to the normal mounting position.

  Further, in the vehicle seat belt device 10, the rear end of the shoulder webbing guide 20 is rotated about the vertical axis 50 to drive the webbing guide portion 20 </ b> A that is the front end of the shoulder webbing guide 20 in the seat width direction. Therefore, the webbing guide portion 20A can be moved greatly with a small operation amount of the second drive motor 58. For this reason, the shoulder webbing guide 20 can be moved from the normal mounting position to the emergency mounting position in a short time from the frontal collision prediction.

  In the above-described first embodiment, the shoulder webbing guide 20 is displaced from the retracted position to the mounting preparation position that is the normal mounting position, and the buckle 26 and the tongue plate 28 of the buckle device 24 are coupled in this state. However, the present invention is not limited to this. For example, the shoulder webbing guide 20 is first displaced from the retracted position to the emergency mounting position (appropriate mounting position). From this state, the buckle 26 and the tongue plate of the buckle device 24 are shown. The shoulder webbing guide 20 may be displaced to the normal mounting position after being coupled to the belt 28.

  In the above-described first embodiment, the control example in which the second drive motor 58 is used only for driving between the normal mounting position and the emergency mounting position of the shoulder webbing guide 20 has been described. For example, when the second drive motor 58 is reversely rotated at the time of displacement from the mounting preparation position to each position, the storage position shown in FIGS. 7A and 7B is taken. It is good also as a structure. In this retracted position, the shoulder webbing guide 20 and the webbing 12 are both directed outward in the seat width direction (for example, a center pillar and a rear pillar). For this reason, in this modification, the webbing 12 can be stored compactly. Thereby, for example, the present invention can also be applied to a vehicle in which the distance between the vehicle seat 11 and the pillar or the adjacent seat is small. Moreover, since the webbing 12 in the retracted state does not face in the vehicle front-rear direction, it looks good and the visibility is easily secured. In this configuration, it is desirable that the left and right shafts 54 not interfere with the first stopper wall 48A except at the mounting preparation position.

  Furthermore, in the first first embodiment described above, an example in which the guide drive mechanism 40 includes the first drive motor 56 and the second drive motor 58 has been shown. However, the present invention is not limited to this, for example, The shoulder webbing guide 20 may be driven by a single motor between the storage position and the mounting preparation position, and between the normal mounting position and the emergency mounting position.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. Parts and portions that are basically the same as those of the first embodiment or the modification described above are denoted by the same reference numerals as those of the first embodiment or the modification, and are not described or illustrated. There is a case.

  FIG. 8A is a schematic plan view showing a guide drive mechanism 82 constituting a vehicle seat belt device 80 according to the second embodiment of the present invention. As shown in this figure, the guide driving mechanism 82 is replaced with the second driving motor 58 that reversibly drives the shoulder webbing guide 20 between the normal mounting position and the emergency mounting position. The vehicle seat belt device 10 according to the first embodiment is different from the vehicle seat belt device 10 according to the first embodiment in that an actuator 84 that irreversibly drives the shoulder webbing guide 20 to the mounting position is provided.

  As shown in FIG. 8A, the stopper portion 48 on the inner side in the sheet width direction is provided with a shaft holding portion 86 so as to sandwich the end portion of the left and right shaft 54 with the first stopper wall 48A. The shaft holding portion 86 is dropped or deformed from the stopper portion 48 when a load of a predetermined value or more in the rearward direction is input, and loses the holding function of the left and right shafts 54. Thereby, in the actuator 84, the shoulder webbing guide 20 is normally moved by the first drive motor 56 in the same storage position as shown in FIGS. 4 (A) and 4 (B). It is driven between a mounting preparation position corresponding to a normal mounting position similar to that shown in FIG.

  In a predetermined case, the actuator 84 has an outer end portion in the seat width direction of the left and right shaft 54 so that the inner end portion 54A in the seat width direction of the left and right shaft 54 presses the shaft holding portion 86 backward with a load of a predetermined value or more. 54B is pressed forward. That is, in the actuator 84, the outer end portion 54B in the seat width direction of the left and right shaft 54 is pressed forward, so that the shoulder webbing guide 20 presses the shaft holding portion 86 rearward while rotating around the vertical shaft 50, thereby holding the shaft. The portion 86 is removed from the stopper portion 48 so that the transition from the normal mounting position to the emergency mounting position is allowed.

  The actuator 84 includes a cylinder 88 fixed to the seat back frame of the seat back 16 in a posture in which the axial direction substantially coincides with the front-rear direction, a piston 90 inserted into the cylinder 88 so as to be slidable in the axial direction, The press rod 92 extending forward from the main body and a micro gas generator (MGG) 94 that generates gas behind the piston 90 in the cylinder 88 by operating are mainly configured. As shown in FIG. 8A, the front end 92A of the pressing rod 92 abuts or is in close proximity to the outer end portion 54B in the seat width direction of the left and right shaft 54 with the shoulder webbing guide 20 positioned at the normal mounting position. Is located.

  When the micro gas generator 94 is actuated, the actuator 84 drives the piston 90 together with the pressing rod 92 by the gas pressure in the cylinder 88 as shown in FIG. By pressing the outer end portion 54B in the seat width direction of the shaft 54 forward, the shaft holding portion 86 pushed rearward with a load equal to or greater than a predetermined value at the inner end portion 54A in the seat width direction of the left and right shaft 54 is the stopper portion 48. The shoulder webbing guide 20 is rotated until the outer end 54B in the seat width direction of the left and right shaft 54 is engaged with the second stopper wall 48B, so that the shoulder webbing guide 20 reaches the emergency mounting position. It has become. In addition, the imaginary line of FIG. 8 (B) has shown the shoulder webbing guide 20 located in a normal mounting position.

  In the guide drive mechanism 82 described above, the operation of the first drive motor 56 and the actuator 84 (and the motor actuator 38 not shown) is controlled by the ECU 96. The ECU 96 is electrically connected to a collision sensor 98 for detecting a frontal collision of the vehicle, instead of the DSS 76 and the radar 78 for predicting the frontal collision of the vehicle. As the collision sensor 98, for example, an acceleration sensor is employed.

  The ECU 96 operates the micro gas generator 94 of the actuator 84 when a signal corresponding to detection of a frontal collision of the vehicle is input from the collision sensor 98. Control at the time of non-collision by the ECU 96 is the same as the control by the ECU 70. The other configuration of the vehicle seat belt device 80 is the same as the corresponding configuration of the vehicle seat belt device 10.

  Therefore, the vehicle seat belt device 80 according to the second embodiment also has the same effect as the effect of the vehicle seat belt device 10 by switching the shoulder webbing guide 20 from the normal mounting position to the emergency mounting position. can get. That is, it is possible to reduce both the feeling of pressure and discomfort by the shoulder webbing guide 20 during normal wearing and the securing of occupant restraint performance by the left and right webbing 12 during a frontal collision.

  Further, since the vehicle seat belt device 80 includes the guide drive mechanism 82 that irreversibly switches the shoulder webbing guide 20 from the normal mounting position to the emergency mounting position, the vehicle seat belt device 80 switches from the normal mounting position to the emergency mounting position with a simple structure. Configuration is realized. Further, in the vehicle seat belt device 80, the shoulder webbing guide 20 is irreversibly switched from the normal mounting position to the emergency mounting position by the operation of the micro gas generator 94, so that the micro gas is detected after the front collision is detected by the collision sensor 98. The generator 94 can be operated to ensure the required passenger restraint performance.

  In each of the above-described embodiments, an example in which the vehicle seat belt devices 10 and 80 are four-point seat belt devices has been described. However, the present invention is not limited to this, for example, a shoulder webbing 12A and a lap webbing 12B. An air belt that is inflated and deployed by gas at the time of a collision may be provided on at least one of the above.

  Further, in each of the above-described embodiments, the example in which the vehicle seat belt devices 10 and 80 are provided with the movable lap webbing guide 36 is shown, but the present invention is not limited to this, and for example, the lap webbing guide 36 is provided. It is good also as a structure which is not provided.

  Further, in each of the above-described embodiments, an example in which the shoulder webbing guide 20 is supported by the seat back 16 has been shown. However, the present invention is not limited to this, and for example, the vehicle seat 11 whose position with respect to the vehicle is fixed. In the applied vehicle seat belt devices 10 and 80, the shoulder webbing guide 20 may be provided on the vehicle body side. Therefore, for example, the shoulder webbing guide 20 may be provided on a roof, a rear package tray, or the like.

  Furthermore, in each of the above-described embodiments, when a signal corresponding to the seating on the vehicle seat 11 is input from the seating sensor 72, each shoulder webbing guide 20 and each slip joint 30 is moved from the retracted position to the mounting preparation position. Although the example displaced to (normal mounting position) is shown, the present invention is not limited to this, for example, instead of the seating sensor 72, a means for directly detecting the opening / closing of the door for getting on and off, The configuration may be such that the shoulder webbing guide 20 and the slip joint 30 are displaced from the retracted position to the mounting preparation position (normal mounting position) by indirectly detecting the opening and closing of the door by a courtesy switch or the like.

1 is a plan view of a vehicle seat to which a vehicle seat belt device according to a first embodiment of the present invention is applied. It is a side view showing typically a guide drive mechanism which constitutes a vehicular seatbelt device concerning a 1st embodiment of the present invention. 1 is a schematic exploded perspective view showing a guide drive mechanism constituting a vehicle seat belt device according to a first embodiment of the present invention. It is a figure which shows the seating state of the passenger | crew to the vehicle seat to which the vehicle seatbelt apparatus which concerns on the 1st Embodiment of this invention was applied, Comprising: (A) is a front view, (B) is a side view. is there. It is a figure which shows the normal mounting state of the webbing by the passenger | crew of the vehicle seatbelt apparatus which concerns on the 1st Embodiment of this invention, Comprising: (A) is a front view, (B) is a side view. It is a front view showing an emergency wearing state of webbing by a crew member of a vehicular seatbelt device concerning a 1st embodiment of the present invention. It is a figure which shows the control result of the control example which concerns on the modification by ECU which comprises the vehicle seatbelt apparatus which concerns on the 1st Embodiment of this invention, Comprising: (A) is a front view, (B) is a side view. is there. It is a figure which shows typically the guide drive mechanism which comprises the vehicle seatbelt apparatus which concerns on the 2nd Embodiment of this invention, Comprising: (A) is a top view which shows schematic structure, (B) shows an operation state. It is a top view.

Explanation of symbols

10. Vehicle seat belt device (vehicle occupant restraint device)
12A Shoulder webbing (upper body restraint webbing)
16 Seat back 20 Shoulder webbing guide 20A Webbing guide (winding part)
40 Guide Drive Mechanism 80 Vehicle Seat Belt Device (Vehicle Crew Restraint Device)
82 Guide drive mechanism

Claims (5)

Upper body restraining webbing for restraining the upper body of the occupant;
A webbing guide having a winding part that protrudes from the upper end part of the seat back to the front of the seat and on which the upper end side of the upper body restraining webbing is wound;
A guide drive mechanism for displacing the winding portion of the webbing guide toward the center side in the width direction of the seat cushion when a vehicle collision is detected or predicted;
An occupant restraint device for vehicles. A pair of left and right upper body restraining webbings for restraining the upper body of the occupant;
A pair of left and right webbing guides that protrude from the upper end portion of the seat back to the front of the seat and each have a winding portion around which the upper end side of the upper body restraining webbing is wound;
A guide drive mechanism for shortening the distance in the seat width direction between the winding portions of the pair of left and right webbing guides when a vehicle collision is detected or predicted;
An occupant restraint device for vehicles. The webbing guide is configured to be able to take a mounting position where the winding part protrudes forward of the seat back and a storage position where the winding part stands on the seat back so that the winding part is located on the upper side. And
The guide driving mechanism normally moves the winding part of the webbing guide located at the mounting position to the outer side in the sheet width direction by reciprocating the winding part in the sheet width direction. 3. The vehicle occupant restraint device according to claim 1, wherein the vehicle occupant restraint device can be switched to either the mounting position or the emergency mounting position located on the inner side in the seat width direction than the normal mounting position. The webbing guide is configured to be able to take a mounting position where the winding part protrudes forward of the seat back and a storage position where the winding part stands on the seat back so that the winding part is located on the upper side. And
The guide drive mechanism is configured to irreversibly displace the winding portion of the webbing guide located at the mounting position inward in the seat width direction when a vehicle collision is detected or predicted. The vehicle occupant restraint device according to claim 1 or 2.   5. The guide driving mechanism according to claim 1, wherein the guide driving mechanism is configured to displace the winding portion in a seat width direction by rotating around a support portion of the webbing guide to the seat back. The vehicle occupant restraint device according to claim 1.

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