JP4506443B2 - Vehicle seat device - Google Patents

Description

  The present invention relates to a vehicle seat device, and more particularly to a vehicle seat device equipped with comfort equipment such as a reclining mechanism and an ottoman mechanism.

  Conventionally, it is known that various comfort equipment is installed in a vehicle seat device so that an occupant can comfortably spend in the passenger compartment.

  For example, a tilt-up mechanism in which the front end portion of the seat cushion is displaced upward as in Patent Document 1 below, or a so-called tilt-up state, or an ottoman on which a foot calf or the like is placed as in Patent Document 2 is seat cushion. It is known that an ottoman mechanism or the like that is deployed in front of the seat is installed in the seat device.

JP-A-7-186793 JP 2000-157367 A

  By the way, in a normal vehicle, in order to seat many passengers in the passenger compartment, a plurality of seat devices are often arranged in the vehicle front-rear direction. For this reason, an occupant may be seated on each of the front seat device (hereinafter, front seat) and the rear seat device (hereinafter, rear seat).

  Even in this case, the occupant may use the above-mentioned comfort equipment to make the seat device different from the normal form so that the passenger can spend comfortably in the vehicle interior. If the configuration of the seat device is changed while the passenger is seated on the vehicle, a new problem may occur in the event of a rear collision (hereinafter referred to as rear collision) of the vehicle.

  As shown in FIG. 10 (a), the front end of the seat cushion 11b is displaced upward by the tilt-up mechanism 40 so that the occupant M of the rear seat 1B can spend comfortably in the passenger compartment C. When the vehicle is positioned above the normal time, as shown in (b), the seat back 12a of the front seat 1A and the occupant of the rear seat 1B tilted rearward due to the impact of the rear impact at the time of the rear impact. This is a problem that the legs of M are in contact with each other and the passenger M of the rear seat 1B feels uncomfortable.

  In other words, the seat back of the seat device is set so as to absorb the impact by elastically deforming (backward tilting) backward to some extent in order to reduce the impact on the occupant when receiving a rear impact. However, if the inclination angle of the seat back is temporarily increased at the time of a rear impact, there arises a problem that the rear seat comes into contact with the foot of the rear seat occupant due to the tilt up of the rear seat.

  In view of this, the present invention provides a vehicle seat device equipped with comfort equipment such as a so-called tilt-up mechanism, in which the rear seat occupant feels uncomfortable when the front end of the seat cushion of the rear seat is positioned upward. An object of the present invention is to provide a vehicle seat device that can be eliminated.

  The vehicle seat device according to the present invention is installed in a vehicle interior, and is installed on a front seat in which a seat back is tilted backward by an impact at the time of a rear collision of the vehicle, on a vehicle rear side of the front seat, and a front end of a seat cushion A rear seat provided with a seat cushion position changing unit that moves the part up and down, a rear collision determination unit that detects or predicts a rear collision of the vehicle, and a rear collision by the rear collision determination unit When the front end portion of the seat cushion of the rear seat is displaced upward when detected or predicted, the distance between the seat back of the front seat and the front end portion of the seat cushion of the rear seat is separated by a predetermined distance or more. Separating means.

  According to the above configuration, when the rear collision is detected or predicted by the rear collision determination unit, and the rear collision is detected or predicted, the seat back of the front seat and the seat cushion of the rear seat are detected by the separation unit. The distance from the front end portion is separated by a predetermined distance or more.

  For this reason, even if the rearward tilt of the seatback occurs due to the impact of the rear impact, at least a predetermined distance is secured between the seatback of the front seat and the front end portion of the seat cushion of the rear seat.

  The predetermined distance is desirably set to such an extent that the occupant's feet, specifically the knee portion, can exist between the seat back of the front seat and the front end portion of the seat cushion of the rear seat. .

  Further, it is preferable that the rear collision determination means predicts a rear collision in order to ensure a predetermined distance more reliably.

  Furthermore, the above-mentioned front seat and rear seat include all seat devices as long as they are seats continuously installed in the front-rear position of the vehicle. For example, in the case of a three-row seat vehicle, one row It may be the second row and the third row.

  In one embodiment of the present invention, the separation means is constituted by control means for controlling the seat cushion position changing portion so that the front end portion of the seat cushion is displaced downward.

  According to the above configuration, the front portion is controlled by controlling the seat cushion position changing portion that moves the front end portion of the seat cushion up and down, for example, the tilt-up mechanism so that the front end portion of the seat cushion is displaced downward by the control means. The distance between the seat back of the seat and the front end portion of the seat cushion of the rear seat is separated at the time of rear collision or prediction of rear collision.

  Therefore, the separating operation can be performed easily and speedily.

  In one embodiment of the present invention, the separating means is constituted by a seat cushion drop-off portion for dropping the front end portion of the seat cushion of the rear seat from the seat cushion support portion supporting the seat cushion.

  According to the above configuration, the distance between the seat back of the front seat and the front end of the seat cushion of the rear seat is caused by dropping the front end of the seat cushion of the rear seat from the seat cushion support portion at the seat cushion falling portion. Are separated at the time of rear collision or for prediction of rear collision.

  Therefore, the separation means can be configured with a simple configuration of dropping off from the seat cushion support portion, and the separation operation can be performed quickly because the separation means is operated using the weight of the occupant.

  In one embodiment of the present invention, the separating means is constituted by a slide mechanism that displaces the front seat toward the vehicle front side or displaces the rear seat toward the vehicle rear side.

  According to the above configuration, the slide mechanism portion displaces the front seat toward the front side of the vehicle or the rear seat toward the rear side of the vehicle, thereby allowing the seat back of the front seat and the front end portion of the seat cushion of the rear seat to Are separated at the time of rear collision or at the time of prediction of rear collision.

  Therefore, the separation means can be configured using a general existing seat slide mechanism.

  In one embodiment of the present invention, when the seat back of the rear seat is inclined rearward by a predetermined angle or more and is in a reclining state, the upper displacement of the front end portion of the seat cushion of the rear seat is maintained. Seat cushion position maintaining means is provided.

  According to the above configuration, when the space between the seat back of the front seat and the front end of the seat cushion of the rear seat is separated by the slide mechanism unit, the seat back of the rear seat is inclined rearward by a predetermined angle or more and reclining. In the state, the upper displacement of the front end portion of the seat cushion of the rear seat is maintained by the seat cushion position maintaining means.

  For this reason, the phenomenon of the rearward movement of the occupant at the time of a rear collision, which occurs when the seat back is greatly inclined backward and is in the reclining state, is maintained by maintaining the upward displacement of the front end portion of the seat cushion. The occupant's calf and the like are caught by the front end surface of the seat cushion and are suppressed.

  Therefore, in the above-mentioned slide mechanism, the seat cushion position is maintained while ensuring a predetermined distance between the seat back of the front seat and the front end of the seat cushion of the rear seat at the time of rear collision or prediction of rear collision. Since the upper displacement of the front end portion of the seat cushion is maintained by the means, the rearward movement of the occupant of the rear seat can be prevented.

  The vehicle seat device according to the present invention is installed in a vehicle interior, and is installed on a front seat in which a seat back is tilted backward by an impact at the time of a rear collision of the vehicle, on a vehicle rear side of the front seat, and a front end of a seat cushion And a rear seat provided with a seat cushion position changing portion for moving the seat up and down, wherein a predetermined portion of the front end portion of the seat cushion of the rear seat is more elastic than other portions of the seat cushion. The deformation amount is set large.

  According to the above configuration, the seat back of the front seat is inclined backward at the time of a rear collision by setting the elastic deformation amount of the predetermined portion of the front end portion of the seat cushion of the rear seat larger than that of other portions of the seat cushion. Even so, the occupant's feet sink into the seat cushion at a predetermined site.

  Therefore, the contact between the occupant's feet of the rear seat and the seat back of the front seat is the same as in the case of the separation even if the distance between the seat back of the front seat and the front end of the seat cushion of the rear seat is not separated. Will be alleviated and passenger discomfort can be alleviated.

  The predetermined portion generally refers to a portion where the occupant places the knee of the foot, for example, a substantially central portion of the upper surface of the front end portion of the seat cushion.

  According to the first invention, the distance between the seat back of the front seat and the front end portion of the seat cushion of the rear seat, which are close to each other due to the rearward tilt of the seat back caused by the impact at the time of the rear impact, is more than a predetermined distance by the separating means Separate.

  For this reason, even if the seat back tilts backward in the case of a rear collision, at least a predetermined distance is secured between the seat back of the front seat and the front end portion of the seat cushion of the rear seat.

  Further, according to the second invention, the predetermined portion of the front end portion of the seat cushion of the rear seat is set to have a larger elastic deformation amount than other portions of the seat cushion, so that the seat of the front seat at the time of the rear impact Even if the back tilts backward, the occupant's feet will sink into the seat cushion at a predetermined site.

  For this reason, the contact of the passenger's foot of the rear seat and the seat back of the front seat is alleviated.

  Therefore, in the vehicle seat device equipped with comfort equipment such as a so-called tilt-up mechanism, it is possible to eliminate the discomfort of the rear seat occupant during the rear impact when the front end portion of the seat cushion of the rear seat is displaced upward. .

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a side view showing a layout structure of the sheet apparatus according to the first embodiment.

  The seat device of the present embodiment includes a front seat 1A installed on the vehicle front side and a rear seat 1B installed on the vehicle rear side in the passenger compartment C, and adopts a front and rear two-row seat layout structure. .

  Both the front seat 1A and the rear seat 1B include seat cushions 11a and 11b that extend in the horizontal direction and seat backs 12a and 12b that stand in the vertical direction so that the occupant M can sit forward. I have. The rear seat 1B is provided with an ottoman 2 on which the occupant M places a calf of a foot or the like.

  Further, the front seat 1A and the rear seat 1B both support the lower portions thereof with support leg brackets 18 so as to have a height slightly separated from the passenger compartment floor F.

  Note that the slide rails 15a and 15b are installed below the seats 1A and 1B so as to slide in the vehicle longitudinal direction. However, the front seat 1A has a slide rail 15a installed on the upper part of the support leg bracket 18, whereas the rear seat 1B has a slide rail 15b installed on the lower part of the support leg bracket 18, that is, the passenger compartment floor F. Yes.

  In the case of the rear seat 1B, there is a high demand for increasing the amount of sliding and effectively using the passenger compartment space, but if the slide rail protrudes above the passenger compartment floor F, the protruding portion As a result, the passenger compartment space cannot be used, so the slide rail 15b is installed directly on the passenger compartment floor F.

  The rear seat 1B will be described in more detail. 2 is a transparent perspective view illustrating the lower part of the rear seat 1B, FIG. 3 is a transparent side view illustrating the internal structure of the rear seat 1B, FIG. 4 is a transparent side view illustrating the operating state of the internal structure, and FIG. FIG. 6 is a plan view mainly showing the internal structure of the ottoman mechanism 20 of the rear seat 1B. FIG. 6 is a plan view mainly showing the internal structure of the tilt-up mechanism 40 of the rear seat 1B.

  The rear seat 1B includes a substantially square seat cushion 11b that forms a seat seat surface and a seat back 12b that forms a seat back, and includes the ottoman 2 on the vehicle front side of the seat cushion 11b as described above.

  As shown in FIG. 5 and the like, the seat cushion 11b has two seat cushion frames 31 and 31 extending in the vehicle front-rear direction on both sides, and two seats extending in the vehicle width direction at the front and rear ends thereof. Cross frames 32 and 32 for connecting the cushion frames are provided. The seat cushion frames 31 and 31 and the cross frames 32 and 32 constitute a skeleton of a rectangular seat cushion 11b.

  Below the seat cushion 11b, two base frames 16 and 16 extending in the vehicle front-rear direction on both sides in the vehicle width direction and a cross member 17 extending and connecting the two base frames in the vehicle width direction are configured. The lower frame 13 is installed on the passenger compartment floor F by four support leg brackets 18 provided at the front end and the rear end of the two base frames 16 and 16, respectively. ing.

  Further, the support leg brackets 18 are slidable in the vehicle front-rear direction by slidingly engaging the two slide rails 15b, 15b extending in the vehicle front-rear direction with the lower part thereof installed on the passenger compartment floor F. It has become. For this reason, the rear seat 1B can be slid in the vehicle front-rear direction, and the passenger compartment space can be used effectively.

  The slide rails 15b and 15b are configured to lock and fix the support leg brackets 18 by an engagement mechanism (not shown) to fix the position of the rear seat 1B.

  The seat back 12b is supported at its lower end at the rear end of the seat cushion 11b so as to be able to recline through a rotation hinge 33, and is erected in a vertical direction with a predetermined inclination angle α from the vertical to the rear.

  The ottoman 2 is formed of a rectangular flat plate member made of PP (polypropylene resin), and its inclination angle β is freely displaced from the vertical direction to the horizontal direction around the upper end portion by an ottoman mechanism 20 described later. It is structured to be able to.

Next, the tilt-up mechanism 40 that moves the front end portions of the seat cushions 11a and 11b up and down will be described.
The tilt-up mechanism 40 is configured by assembling a plurality of components to the above-described seat cushion frames 31 and 31.

  The seat cushion frames 31, 31 are pivotally attached to the base frames 16, 16 at the front end via the front link member 41 and the rear end via the rear link member 42. It is fixed to the frames 16 and 16 so as to be swingable. The seat cushion 11b is moved up and down with respect to the base frames 16 and 16 to tilt up the seat cushion 11b (displace the front end of the seat cushion 11b upward) or tilt down ( The front end portion of the seat cushion 11b can be displaced downward).

  An operation lever 43 that is operated by an occupant is provided at a lateral outer end of the seat cushion frame 31. The operation lever 43 is connected to the tilt gear 44 via a rotation shaft 43a extending in the vehicle width direction. For this reason, the operating force of the operating lever 43 is transmitted into the tilt-up mechanism 40 via the tilt gear 44.

  The tilt gear 44 meshes with a first idle gear 45 disposed in front thereof, and the first idle gear 45 meshes with a second idle gear 46 disposed further in front thereof. The second idle gear 46 meshes with rack teeth 41 a formed on the front link member 41. The operating force is transmitted from the tilt gear 44 to the front link member 41 through the meshing of the series of gears.

  Each gear is supported at both ends by a seat cushion frame 31 and a support frame 34 via a rotation shaft extending in the vehicle width direction, and is firmly supported by the seat cushion frame 31.

  On the other hand, the front link member 41 to which the operating force is transmitted has an elongated hole in which a lower pivot point 41b is pivotally attached to the base frame 16 and a central pin portion 41c is formed in the vehicle front-rear direction of the seat cushion frame 31. It is fixedly engaged with 31a. As a result, when the front link member 41 receives a force drawn to the vehicle rear side by the rack teeth 41a, the front link member 41 rotates upward around the lower pivot point 41b, and at the same time, the front end portion of the seat cushion 11b is Move upward.

  Thus, in the tilt-up mechanism 40, as shown in FIG. 4, when the occupant pulls up the operation lever 43, the tilt gear 44 rotates clockwise, and then the first idle gear 45 and the second idle gear 46 are moved. By rotating counterclockwise and clockwise, respectively, the operation force from the tilt gear 44 is transmitted to the front link member 41 as a force for pulling the vehicle rearward. For this reason, the front end portion of the seat cushion frame 31 rises as shown in FIG.

  Further, since the front link member 41 is biased downward by a biasing means 47 such as a spring member, the rack teeth 41a can always be engaged with the second idle gear 46. For this reason, the vertical position of the front end portion of the seat cushion 11b can be stabilized.

  Further, the ratchet mechanism 48 is engaged with the tilt gear 44 so that the position (rotation angle) of the tilt gear 44 is maintained. For this reason, even if the occupant releases his hand from the operation lever 43, the tilt-up position of the seat cushion 11b is maintained.

  As described above, the tilt-up mechanism 40 of the present embodiment is configured such that the seat cushion 11b can be tilted up and down by manual operation by the operation lever 43.

  Further, the tilt-up mechanism 40 is provided with a tilt tensioner device 49 that forcibly displaces the front end portion of the seat cushion 11b in a rear collision.

  The tilt tensioner device 49 is installed on the seat cushion frame 31 behind the tilt gear 44 so as to extend in the vehicle front-rear direction, and the front end of the wire is locked and fixed below the rotation shaft 43 a of the tilt gear 44. is doing.

  For this reason, when the tilt tensioner device 49 is actuated (retracted), the tilt gear 44 is rotated counterclockwise as shown in FIG. 4 to forcibly displace the front end of the seat cushion 11b downward (tilt down). become.

  The ratchet mechanism 48 that holds the position of the tilt gear 44 employs a release structure that releases the engagement with the tilt gear 44 when a predetermined impact is sensed, although not shown. This is because the operation of the tilt tensioner device 49 is not hindered when the position of the tilt gear 44 is released during the rear-end collision.

  In addition to the tilt tensioner device 49, the structure for forcibly moving the front end portion of the seat cushion 11b downward at the time of a rear impact, for example, a structure for forcibly turning the tilt gear 44 using a spring member or the like, When the tilt-up mechanism 40 is operated by an electric motor or the like, it is conceivable to adopt a structure in which the tilt gear 44 is rotated using the electric motor or the like. Instead of rotating the tilt gear 44, a configuration in which the front link member 41 is forcibly rotated downward to displace the front end portion of the seat cushion 11b downward may be employed.

  Next, the ottoman mechanism 20 that rotates the ottoman 2 on which the calf is placed will be described.

  As described above, the ottoman 2 is installed on the vehicle front side of the seat cushion 11b and is folded in the vertical direction along the front end surface of the seat cushion 11b when not in use. A substantially rectangular plate-like base body 21 is provided on the back side of the ottoman 2.

  The base body 21 is provided with two elongated holes 21a for engaging the two boss portions 24 extending from the ottoman 2, and the boss portion 24 is slidably engaged with the elongated holes 21a. Is slidably supported.

  The upper end of the base body 21 is fixed to a base gear 22 having a rotation shaft in the vehicle width direction. For this reason, the base body is displaced according to the rotation of the base gear 22. And this base gearwheel 22 is comprised with the cylindrical gearwheel extended in a vehicle width direction, and is installed in the front-end part upper part in the seat cushion 11b.

  An ottoman gear 23 that meshes with the base gear 22 is provided on the rear side of the base gear 22. The Ottoman gear 23 is also a cylindrical gear having a rotation shaft in the vehicle width direction. Thus, the ottoman 2 is finally rotated according to the rotation of the ottoman gear 23.

  On both side portions of the ottoman gear 23, pulley portions 23a having a smooth surface are formed. The pulley portion 23 a is set to wind up the wire member 25 that is locked and fixed to the boss portion 24 of the ottoman 2, and the other end of the wire member 25 is also locked and fixed.

  The wire member 25 is provided to project the ottoman 2 from the base body 21 to the front side of the vehicle when in use.

  In addition, a pendulum member 27 is provided on the rotating shaft of the ottoman gear 23 via an arm member 26 extending to the rear side of the vehicle. The pendulum member 27 is composed of a metal cylindrical weight member 27a and a suspension wire 27b. As will be described later, the pendulum member 27 is configured to swing to the rear side of the vehicle when a rear collision of the vehicle is detected. ing.

  Further, a ratchet gear 28 is provided on the side of the arm member 26, and is configured to hold the rotational position of the ottoman gear 23 by meshing with a leaf spring ratchet tooth 29 behind the arm member 26.

  Thus, by holding the rotation position of the ottoman gear 23 by the ratchet gear 28 and the leaf spring ratchet teeth 29, the inclination angle β (rotation position) of the ottoman 2 is maintained.

  For this reason, when the inclination angle β of the ottoman 2 is displaced, it is necessary to rotate the ottoman 2 against the holding force of the ratchet gear 28 and the leaf spring ratchet teeth 29. By manually rotating 2, the tilt angle β of the ottoman 2 is displaced against this holding force.

  However, a separate operation lever 43 may be provided to displace the inclination angle β of the ottoman 2.

  Further, the rear seat 1B is provided with a well-known reclining mechanism 50 (not shown) at the rotation hinge 33 portion of the seat back 12b, and the inclination angle α of the seat back 12b can be freely adjusted by the operation of the occupant. It can be changed to

  Further, the reclining mechanism 50 is provided with a reclining sensor 62 for detecting the inclination angle α of the seat back 12b thus changed.

  Next, the operation system at the time of rear collision of the rear seat 1B will be described with reference to the system block diagram of FIG. 7 and the control flowchart of FIG.

  As shown in FIG. 7, the system block of this embodiment includes a CPU (central processing unit) 60 as a control unit that controls the operation of the rear seat 1B at the time of a rear collision. The rear impact sensor 61 for predicting the rear impact, the reclining sensor 62 for detecting the inclination angle α of the seat back 12a, and the weight sensor 63 for detecting the weight of an occupant seated on the rear seat 1B are connected. .

  The rear collision sensor 61 is installed in a rear bumper (not shown) of the rear of the vehicle, and the weight sensor 63 is installed in the seat cushion 11b.

  On the other hand, as output means, a tilt-up mechanism 40 (tilt tensioner device 49) that moves the front end of the seat cushion 11b up and down is connected to the CPU 60.

The system block configured in this way is controlled by the control flow shown in FIG.
First, in S <b> 1, various data of each input unit described above is read into the CPU 60.

  Next, it is judged whether it is more than predetermined weight by S2. When the weight is not equal to or greater than the predetermined weight (NO), for example, when the occupant is not seated on the rear seat 1B or when the infant is seated, control may be wasted or safety may be impaired. Therefore, the following control is not performed and the process returns to return.

  Next, in S3, it is determined whether or not a rear-end collision is predicted. In this prediction, the distance between the following vehicle and the following vehicle is detected by a radar sensor or the like, and this distance is determined according to the degree of change. Thereby, for example, when it is determined that there is a high possibility that a collision will occur after 1 to 3 seconds, a prediction of a collision is determined. When the rear collision prediction is determined (YES), the following control is performed in advance before the rear collision. By performing the control in advance in this way, it is possible to reliably eliminate the passenger's discomfort.

  However, if the collision prediction is not determined (NO), the process proceeds to return and the next control is ready.

  If collision prediction is determined (YES), the process proceeds to S4 and tilt-down control is performed. This tilt down control is performed by operating the tilt tensioner device 49. By operating the tilt tensioner device 49, the tilt gear 44 rotates in a direction in which the front end portion of the seat cushion 11b is displaced downward.

  By controlling in this way, in this embodiment, it is comprised so that the front-end part of the seat cushion 11b of the rear seat 1B may be displaced downward at the time of rear collision prediction.

  Moreover, in this embodiment, it is comprised so that the ottoman 2 of the rear-seat 1B may be displaced to a retracted state at the time of a rear collision.

  That is, as shown in FIG. 9, when a rear impact load of a predetermined value or more is applied, the pendulum member 27 moves to the vehicle rear side, and the suspension wire 27a of the pendulum member 27 moves the leaf spring ratchet teeth 29 rearward. Therefore, the meshing between the leaf spring ratchet teeth and the ratchet gear 28 is released (one-dot chain line). As a result, the ottoman gear 23 is released from holding the rotation angle and is rotated by its own weight to displace the ottoman 2 from the substantially horizontal direction in the use state to the vertical direction in the retracted state.

  In this embodiment, since the rotation angle of the ottoman gear 23 is held by the leaf spring member, the release degree is changed according to the collision load in the present embodiment. That is, when a large rear impact load is received, the leaf spring ratchet teeth 29 are hardly displaced rearward, and the ottoman 2 is greatly displaced until the retracted state. The leaf spring ratchet teeth 29 are slightly displaced rearward so that the ottoman 2 is not displaced so much.

  Therefore, in this embodiment, the amount of displacement of the ottoman 2 can be changed according to the degree of collision by holding the ottoman gear 23 with the leaf spring member.

  As described above, in the present embodiment, at the time of the rear collision and the prediction of the rear collision, the seat cushion 11b of the rear seat 1B is tilted down so that the ottoman 2 is in the retracted state, so that the occupant of the rear seat 1B can Sometimes I don't feel uncomfortable.

  That is, in the case of the conventional seat device, as shown in FIG. 10A, the occupant M of the rear seat 1B displaces the front end portion of the seat cushion 11b upward by the tilt-up mechanism 40, thereby Is positioned above the normal time, as shown in (b), the seat back 12a of the front seat 1A and the legs of the occupant M of the rear seat 1B, which are tilted backward by an impact at the time of a rear impact, are shown. There was a problem that the occupant M of the rear seat 1B felt uncomfortable at the time of rear-end collision.

  On the other hand, in the case of the seat device of this embodiment, as shown in FIG. 11A, the front end portion of the seat cushion 11b is displaced upward by the tilt-up mechanism 40, and the foot of the occupant M of the rear seat 1B is normally moved. Even when it is positioned above the time, as shown in (b), the front end of the seat cushion 11b of the rear seat 1B is displaced downward (tilt down) at the time of the rear impact and the rear impact prediction. The distance (L) between the seat back 12a of the seat 1A and the seat cushion 11b of the rear seat 1B can be separated, and a space in which the foot of the occupant M can exist can be secured during this interval.

  For this reason, the contact between the seat back 12a of the front seat 1A and the foot of the occupant M of the rear seat 1B that has occurred during the rear impact is eliminated, and the discomfort of the occupant M of the rear seat 1B can be eliminated.

  Note that the larger the distance (L) is, the greater the possibility of contact is. Therefore, it is desirable that the distance (L) is large.

  In the present embodiment, the existing tilt-up mechanism 40 is configured so that the distance between the seat back 12a of the front seat 1A and the front end of the seat cushion 11b of the rear seat 1B is separated.

  Therefore, it is possible to effectively and effectively use the existing mechanism called the tilt-up mechanism 40 so that the separation operation can be performed easily and speedily.

  Furthermore, in this embodiment, the ottoman 2 is also displaced to the retracted state at the time of a rear collision. For this reason, also about the shin part of the passenger | crew's M leg | foot, the contact with the seat back 12a of the front seat 1A is lose | eliminated, and the discomfort of the passenger | crew M can be eliminated more reliably.

  In this embodiment, the tilt-up mechanism 40 is electrically operated at the time of the rear collision and the prediction of the rear collision, and the operation of the Ottoman 2 mechanism is mechanically performed. You may comprise so that it may carry out uniformly.

  Next, a second embodiment will be described with reference to FIGS. In the second embodiment, the seat cushion 11b is dropped from the support leg bracket 118 that supports the front end portion of the seat cushion 11b at the time of a rear collision, and the seat back 12a of the front seat 1A and the seat of the rear seat 1B The space | interval with the cushion 11b is separated. In addition, about the component which is common in the above-mentioned embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  Also in the seat device of the second embodiment, as shown in FIG. 12A, the front end portion of the seat cushion 11b is displaced upward by the tilt-up mechanism 40, so that the foot of the occupant M of the rear seat 1B is more than normal. Even when the upper seat is positioned upward, as shown in (b), the front end of the seat cushion 11b of the rear seat 1B is dropped from the support leg bracket 118 at the time of a rear collision, so that the seat of the front seat 1A The distance (L) between the back 12a and the seat cushion 11b of the rear seat 1B can be separated, and a space in which the foot of the occupant M can exist can be ensured.

  As shown in the schematic diagram of FIG. 13, the specific drop-off structure is such that the connection between the support leg bracket 118 and the base frame 116 is a pin connection, and the base frame 116 is released by releasing the pin connection at the time of a rear collision. The support leg bracket 118 is configured to drop off.

  That is, the pin 117 provided on the base frame 116 side is locked in the engagement groove 119 provided in the support leg bracket 118, and the locked state of the pin 117 is urged in the locking direction (the vehicle front side). The support leg bracket 118 and the base frame 116 are pin-coupled by being locked and fixed by the locking cam 120, but the locking cam 120 is connected to the swinging weight 121 located behind the locking cam 120. When the swinging weight 121 swings rearward of the vehicle against the biasing force of the spring 122 at the time of a rear collision (the state of the one-dot chain line), the locking cam 120 also moves rearward, and the pin 117 is locked. The state is released, and the pin 117 is dropped downward from the engagement groove 119 of the support leg bracket 118.

  Thus, also in this embodiment, the seat cushion 12b of the front seat 1A and the seat cushion 11b of the rear seat 1B are removed by dropping the front end portion of the seat cushion 11b from the support leg bracket 118 in the case of a rear collision. Since the interval can be reliably ensured, the discomfort of the occupant M can be eliminated.

  In particular, in this embodiment, the distance between the seat back 12a of the front seat 1A and the seat cushion 11b of the rear seat 1B can be separated with a simple configuration in which the seat cushion 11b is dropped from the support leg bracket 118. Further, since the operation is performed using the weight of the occupant M, the separation operation can be performed quickly.

  Further, in this embodiment, since the rear impact is detected using the swinging weight 121, the operation reliability can be improved, and the production cost can be reduced because the rear impact sensor is not required. There is also an effect.

  Note that the drop-off structure is not limited to this structure. For example, when a relative position change occurs between the base frame 16 and the support leg bracket 18 due to a rear-end impact, the base frame 16 May be employed so that it can be detached from the support leg bracket 18, or a structure may be employed in which the joint between the two is broken by a rear impact.

  Further, the support leg bracket 18 itself may be deformed or damaged to displace the front end portion of the seat cushion 11b downward.

  Other functions and effects are the same as those of the above-described embodiment.

  Next, a third embodiment will be described with reference to FIGS. In the third embodiment, the front seat 1A is slid to the front side of the vehicle at the time of the rear collision and the rear collision prediction, and the seat back 12a of the front seat 1A and the seat cushion 11b of the rear seat 1B The interval is separated. In addition, about the component which is common in the above-mentioned embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 14, the system block of this embodiment includes a CPU (Central Processing Unit) 60 as a control means, as in FIG. 7 described above. A rear collision sensor 61 and a reclining sensor are provided for the CPU 60. 62 and the weight sensor 63 are connected as input means.

  On the other hand, as an output means, in addition to the tilt-up mechanism 40 (tilt tensioner device 49), a seat slide mechanism (slide tensioner device) 130 that slides the front seat 1A to the front side of the vehicle is connected to the CPU 60.

  The system block configured in this way is controlled by the control flow shown in FIG.

  First, in S11, various data of the above-described input means are read into the CPU 60.

  Next, in S12, it is determined whether the weight is a predetermined weight or more. When the weight is not equal to or greater than the predetermined weight (NO), for example, when the occupant M is not seated on the rear seat 1B or when an infant is seated, it is wasteful to perform the control or the safety is impaired. Since there is a fear, the following control is not performed and the process directly returns.

  Next, in S13, it is determined whether or not a rear-end collision is predicted. When the rear collision prediction is determined (YES), the following control is performed in advance before the rear collision. By performing control in advance in this way, it is possible to reliably eliminate discomfort of the occupant M.

  However, if the collision prediction is not determined (NO), the process proceeds to return and the next control is ready.

  When the collision prediction is determined in S13 (YES), the process proceeds to S14 to determine whether the inclination angle α of the seat back 12b of the rear seat 1B is equal to or larger than a predetermined angle. The predetermined angle here is preferably set to about 45 degrees. The reason for this will be described later.

  If it is not determined in S14 that the angle is equal to or greater than the predetermined angle (NO), the process proceeds to S15 and S16 to perform seat slide control and tilt down control. That is, the front seat 1A is forcibly slid to the vehicle front side, and the front end portion of the seat cushion 11b of the rear seat 1B is displaced downward.

  On the other hand, if it is determined in S14 that the angle is equal to or greater than the predetermined angle (YES), the process proceeds to S17 and S18, and the tilt up is maintained as it is while performing the seat slide control. That is, although the front seat 1A is slid to the vehicle front side, the front end portion of the seat cushion 11b of the rear seat 1B maintains the upper position.

  In this way, it is determined whether the inclination angle α of the seat back 12b of the rear seat 1B is equal to or greater than a predetermined angle, and the control is changed to prevent the rearward movement of the occupant M of the rear seat 1B at the time of a rear collision. This is for another purpose.

  That is, when the seat back 12b is tilted rearward by 45 degrees or more, the posture of the occupant M of the rear seat 1B is substantially horizontal on the seat. There is a phenomenon that M becomes easy to move backward. By maintaining the tilted up state of the seat cushion 11b, the calf of the foot of the occupant M is attracted to the front end surface of the seat cushion 11b, and the calf is caught by the seat cushion 11b at the time of a rear collision, and the occupant M moves backward. Can be prevented.

  However, the tilt-up state can be maintained in this manner by sliding the front seat 1A toward the front side of the vehicle to ensure the distance between the seat back 12a of the front seat 1A and the seat cushion 11b of the rear seat 1B. This is possible because of the separation, and when the slide movement is not performed, it is desirable to displace the front end portions of the seat cushions 11a and 11b downward as in the above-described embodiment.

  For this reason, also in this embodiment, when the inclination angle α of the seat back 12b of the rear seat 1B is not equal to or greater than a predetermined angle, the tilt-down control is performed, and the front end portion of the seat cushion 11b is displaced downward, thereby Contact between the foot of the occupant M of 1B and the seat back 12a of the front seat 1A is prevented from occurring completely.

  FIG. 16 is a schematic side view showing the behavior at the time of rear collision in this embodiment. Even in this embodiment, as shown in (a), even when the front end portion of the seat cushion 11b is displaced upward by the tilt-up mechanism 40 so that the foot of the occupant M of the rear seat 1B is positioned higher than normal. As shown in (b), in order to cause the front seat 1A to slide and move to the front side of the vehicle by operating the slide tensioner device 130 provided with the front seat 1A in the lower part thereof at the time of a rear collision, the front seat 1A The distance (L) between the seat back 12a and the seat cushion 11b of the rear seat 1B can be separated, and a space in which the foot of the occupant M can exist can be secured. The sliding movement toward the front side of the vehicle is performed using the slide rail 15a of the front seat 1A.

  Further, the seat cushion 11b of the rear seat 1B is maintained in a tilt-up state because the inclination angle α of the seat back 12b is equal to or greater than a predetermined angle. Further, the ottoman 2 of the rear seat 1B is displaced to the storage position as in the above-described embodiment.

  As described above, also in the present embodiment, the seat back 12a of the front seat 1A and the seat cushion 11b of the rear seat 1B at the time of the rear collision are obtained by sliding the front seat 1A to the front side of the vehicle when the rear collision is predicted. Therefore, the discomfort of the occupant M can be eliminated.

  Further, when the seat back 12b of the rear seat 1B is greatly inclined rearward and in a reclining state, the upward displacement (tilt up) of the front end portions of the seat cushions 11a and 11b is maintained, so that at the time of a rear collision The rearward movement of the occupant M in the rear seat 1B can be prevented.

  Further, in the present embodiment, since the front seat 1A is slid using the slide rail 15a, the seat back 12a of the front seat 1A and the rear seat 1B are used using general existing equipment. A distance from the seat cushion 11b can be secured.

  In the present embodiment, the front seat 1A is slid and moved. However, if there is a moving space behind the vehicle, a structure in which the rear seat 1B is slid toward the vehicle rear side may be adopted. In this case, the rear seat 1B is provided with a slide tensioner device that slides toward the vehicle rear side.

  Further, the slide movement drive source is not limited to the tilt tensioner device 130, and may be an electric motor or a spring member.

  Other functions and effects are the same as those in the above-described embodiment.

  Next, a fourth embodiment will be described with reference to FIGS. In the fourth embodiment, a predetermined portion at the front end portion of the seat cushion 211 of the rear seat 1B is configured to be more easily deformed than other portions, and the foot of the occupant M is seated at the predetermined portion at the time of a rear collision. It is intended to sink into the cushion 211. In addition, about the component which is common in the above-mentioned embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  Also in the fourth embodiment, as shown in FIG. 17 (a), the front end portion of the seat cushion 211 is displaced upward by the tilt-up mechanism 40 so that the foot of the occupant M of the rear seat 1B is raised upward than usual. Even when it is positioned, as shown in (b), since the foot of the occupant M sinks into the front end portion of the seat cushion 211 of the rear seat 1B during the rear impact, the seat back 12a of the front seat 1A tilts backward. Even so, it is possible to secure a space where the foot of the occupant M can exist at the front end portion of the seat cushion 211 of the rear seat 1B.

  As shown in the transparent perspective view of FIG. 18, the specific structure of the seat cushion 211 is a cross frame at the front end portion of the cross frames 232... That connects the left and right seat cushion frames 231 and 231 extending in the vehicle width direction. 232 is provided with a deformable portion 233 that bends downward at the center in the vehicle width direction.

  As described above, by providing the deformed portion 233 on the cross frame 232, only the central portion 234 (hatched area) corresponding to the deformed portion 233 of the front end portion of the seat cushion 211 covered with the cushion body (not shown). Will be greatly deformed compared to other parts.

  For this reason, if the foot of the occupant M of the rear seat 1B is in the central portion 234 corresponding to the deformed portion 233, even when the seat back 12a of the front seat 1A is tilted backward due to the impact of the rear impact, The foot of the occupant M will sink into the seat cushion 211.

  Therefore, according to the present embodiment, the contact between the seat back 12a of the front seat 1A and the foot of the occupant M at the time of the rear collision is alleviated, so that the discomfort of the occupant M can be alleviated.

  In particular, the present embodiment does not require a structure for changing the form of the seat at the time of rear collision or prediction of the rear collision as in the above-described embodiments, so that the discomfort of the occupant M is alleviated without incurring production costs. be able to.

  Moreover, according to this embodiment, even when it is used again as the rear seat 1B after the rear impact, it can be used as it is, so that maintenance costs are not required.

  In addition, since a similar effect can be obtained by making the predetermined part of the front end of the seat cushion 211 of the rear seat 1B easier to deform than other parts, for example, a weak part is provided in the cross frame 232 at the front end. It is also conceivable that the cushion body of the seat cushion 211 is made of a flexible material only at a predetermined portion of the front end portion.

  Although a plurality of embodiments have been described above, the present invention is not limited to these embodiments. In the above-described embodiment, a two-row seat vehicle has been described. However, a three-row seat vehicle or a multi-row seat vehicle may be used. Further, regarding the rear collision determination, either rear collision detection or rear collision prediction may be determined.

As described above, in the correspondence between the configuration of the present invention and the above-described embodiment,
The seat cushion position changing portion of the present invention corresponds to the tilt-up mechanism 40 of the embodiment,
Similarly,
The rear collision determination means corresponds to the rear collision sensor 61 and the swing weight 121,
The separation means corresponds to the CPU 60, the locking cam 120, the engagement groove 119, and the seat slide mechanism 130,
The control means corresponds to the CPU 60,
The seat cushion dropout portion corresponds to the locking cam 120 and the engagement groove 119,
The slide mechanism unit corresponds to the seat slide mechanism 130,
The seat cushion position maintaining means corresponds to the CPU 60,
The present invention includes embodiments applied to all vehicle seat devices.

The side view which showed the layout structure of the sheet | seat apparatus in 1st embodiment. The permeation | transmission perspective view explaining the lower part of a rear seat. The permeation | transmission side view explaining the internal structure of a rear seat. The permeation | transmission side view explaining the operation state of an internal structure. The top view which mainly showed the internal structure of the tilt-up mechanism of a rear seat. The top view which mainly showed the internal structure of the ottoman mechanism of the rear seat. The system block diagram of 1st embodiment. The control flowchart of 1st embodiment. The principal part detailed top view explaining the action | operation at the time of the rear collision of an ottoman mechanism. The schematic diagram explaining the behavior at the time of rear collision in the conventional seat apparatus. The schematic diagram explaining the behavior at the time of the rear collision in 1st embodiment. The schematic diagram explaining the behavior at the time of the rear collision in 2nd embodiment. FIG. 6 is a schematic diagram for explaining a seat cushion falling structure. The system block diagram of 3rd embodiment. The control flowchart of 3rd embodiment. The schematic diagram explaining the behavior at the time of rear collision in 3rd embodiment. The schematic diagram explaining the behavior at the time of the rear collision in 4th embodiment. Transparent perspective view of the seat cushion of the fourth embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A ... Front seat 1B ... Rear seat 11a, 11b ... Seat cushion 12a, 12b ... Seat back 40 ... Tilt-up mechanism (seat cushion position changing part)
50 ... Reclining mechanism (reclining mechanism section)
61. Rear collision sensor (rear collision determination means)
60 ... CPU (separation means)
119... Engaging groove (separating means)
120... Locking cam (separating means)
121... Swinging weight (rear collision determination means)
130... Seat slide mechanism (separation means)

Claims (6)

Installed in the passenger compartment, the front seat where the seat back tilts backward due to the impact of a rear-end collision of the vehicle, and the seat cushion position change that moves the front end of the seat cushion up and down, installed on the vehicle rear side of the front seat A vehicle seat device comprising a rear seat provided with a portion,
Rear collision determination means for detecting or predicting a rear collision of the vehicle;
When the rear end collision detecting means detects or predicts a rear collision, when the front end of the seat cushion of the rear seat is displaced upward, the seat back of the front seat and the front end of the seat cushion of the rear seat The vehicle seat apparatus provided with the separation means which spaces apart the space | interval more than predetermined distance. The vehicle seat device according to claim 1, wherein the separating means is configured by a control means for controlling the seat cushion position changing portion so that a front end portion of the seat cushion is displaced downward. The vehicular seat device according to claim 1, wherein the separating means is constituted by a seat cushion dropout portion that drops a front end portion of a seat cushion of a rear seat from a seat cushion support portion that supports the seat cushion. The vehicle seat device according to claim 1, wherein the separation means is configured by a slide mechanism that displaces the front seat toward the vehicle front side or displaces the rear seat toward the vehicle rear side. A seat cushion position maintaining means for maintaining an upward displacement of a front end portion of the seat cushion of the rear seat when the seat back of the rear seat is inclined rearward by a predetermined angle or more. Item 5. The vehicle seat device according to Item 4. Installed in the passenger compartment, the front seat where the seat back tilts backward due to the impact of a rear-end collision of the vehicle, and the seat cushion position change that moves the front end of the seat cushion up and down, installed on the vehicle rear side of the front seat A vehicle seat device comprising a rear seat provided with a portion,
A vehicle seat device in which a predetermined portion of a front end portion of the seat cushion of the rear seat is set to have a larger elastic deformation amount than other portions of the seat cushion.

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