JP7024481B2 - Vehicle seat - Google Patents

Description

The present invention relates to a vehicle seat.

Patent Document 1 discloses a vehicle seat provided with a headrest that reduces the whipping of an occupant by tilting the headrest upward and forward of the vehicle by utilizing the load applied to the seat back at the time of a rear collision of the vehicle.

On the other hand, Patent Document 2 describes that in a vehicle driving support device capable of switching between an automatic driving mode and a manual driving mode, the reclining angle in the automatic driving mode is controlled to be larger than the reclining angle in the manual driving mode. Is disclosed.

Japanese Unexamined Patent Publication No. 2006-56358 WO2015 / 01186A Gazette

Here, in a vehicle provided with the vehicle driving support device of Patent Document 2, when the vehicle seat of Patent Document 1 is applied, if the vehicle collides with the vehicle in a comfortable posture with the seat back tilted, the following problems occur. Occurs. For example, when the reclining angle of the seat back is large, the load received by the seat back is insufficient, so that the headrest cannot be sufficiently tilted. Even if the headrest is tilted, if the headrest is tilted, the head cannot be received at the time of a rear collision, and the head escapes diagonally backward, which may cause a secondary collision with the ceiling or the like. ..

In consideration of the above facts, an object of the present invention is to provide a vehicle seat capable of reducing an injury value in the event of a collision from the rear surface of a occupant when the reclining angle is large.

The vehicle seat according to the first aspect of the invention includes a seat back that can be tilted about the vehicle width direction, an upper part of a headrest that supports the occupant's head on a side far from the seat back, and a side close to the seat back. The headrest includes a headrest including a lower part of the headrest that supports the head, and the headrest has one of the upper part of the headrest and the lower part of the headrest movable independently from the other of the upper part of the headrest and the lower part of the headrest, and the seat back. When the headrest is tilted backward in the horizontal direction and is in a comfortable posture, the upper part of the headrest protrudes toward the head side relative to the lower part of the headrest so that the headrest wraps the head of the occupant. It is configured .

The invention according to claim 1 is applied to, for example, a vehicle seat installed in a vehicle so that an occupant faces the front of the vehicle. In this case, as the headrest of the vehicle seat tilts backward, the side far from the seat back protrudes toward the occupant's head side relative to the side closer to the seat back, and the occupant's head is on the rear side of the vehicle. The receiving part of the part is generated. As a result, the headrest can wrap the occupant's head, and the head rest is suppressed in the event of a rear collision, so that the injury value is reduced. When applied to a seat in which the occupant faces the rear of the vehicle and sits down, the head is suppressed from coming off at the time of a front collision, so that the injury value is reduced.

INDUSTRIAL APPLICABILITY The present invention can reduce the injury value when the occupant collides from the back direction when the reclining angle is large.

It is a vehicle seat according to the first embodiment, and is a side view seen from the vehicle width direction showing a state in which an occupant is seated. It is a side view corresponding to FIG. 1 which is the vehicle seat which concerns on 1st Embodiment, and shows the operating state of the headrest when the seat back is tilted in the horizontal direction. It is an enlarged side view which shows the main part of the headrest of the vehicle seat which concerns on 2nd Embodiment enlarged. It is an enlarged side view which shows the main part of the headrest of the vehicle seat which concerns on 3rd Embodiment in an enlarged manner. It is an enlarged side view which shows the main part of the headrest of the vehicle seat which concerns on 4th Embodiment enlarged.

The vehicle seat according to each embodiment of the present invention will be described with reference to FIGS. 1 to 5. In the figure, the arrow FR indicates the front of the seat of the vehicle (front of the vehicle), and the arrow UP indicates the upper part of the seat (above the vehicle). Further, when explaining the positional relationship of each part in the vehicle seat, unless otherwise specified, the description will be made based on the state in which the seat back shown in FIG. 1 is upright.

(First Embodiment)
As shown in FIG. 1, the vehicle seat 10 according to the first embodiment is installed in the vehicle so that the occupant P faces the front of the vehicle. The seat 10 includes a seat cushion 12 on which the occupant P sits, and a seat back 14 that supports the back of the occupant P. Further, a headrest 16 that supports the head H of the occupant P is connected to the seat back 14.

The seat cushion 12 is configured by attaching a cushion material to the seat cushion frame 12A which is a skeleton member. Further, the seat cushion frame 12A is fixed to a pair of left and right seat rails (not shown) provided on the floor. As a result, the seat 10 is supported so as to be movable in the front-rear direction of the vehicle.

The seat back 14 is configured by attaching a cushion material to the seat back frame 14A which is a skeleton member. The seat back 14 is supported so as to be tiltable toward the rear side of the seat of the seat cushion 12. Specifically, reclining rods 12B are passed to both ends in the seat width direction at the rear end of the seat cushion frame 12A, and the seat back frame 14A is rotatably supported by the reclining rods 12B. That is, the seat back 14 can be tilted about an axis held in the vehicle width direction.

The headrest 16 is provided on the upper side of the seat of the seat back 14. The headrest 16 extends in the longitudinal direction in the seat width direction and has a barrel shape flattened in the front-rear direction of the seat. Further, the headrest 16 is configured by covering a cushion material formed of urethane foam with a skin material formed of a cloth material, leather or the like.

The headrest 16 includes a base portion 16A provided on the lower side of the seat, that is, a side closer to the seat back 14, and a tilting portion 16B provided on the upper side of the vehicle, that is, a side far from the seat back 14. The base portion 16A occupies approximately half of the lower portion of the headrest 16, and the tilting portion 16B occupies approximately half of the upper portion of the headrest 16.

The base portion 16A is provided with headrest stays 18 extending toward the seat back 14 and forming a pair in the seat width direction. The headrest stay 18 is inserted into a pair of holders 14B fixed to the seat back frame 14A, respectively, whereby the headrest 16 is movably supported with respect to the seat back 14 in the axial direction of the headrest stay 18.

Further, a headrest rod 16C about the width direction of the seat is provided at substantially the center of the headrest 16 in the vertical direction of the seat. The headrest rod 16C is fixed to the tilting portion 16B and is rotatably supported with respect to the base portion 16A. As shown in FIG. 2, the tilting portion 16B tilts in the front-rear direction of the seat with respect to the base portion 16A about the headrest rod 16C. The tilting portion 16B is tilted by an actuating mechanism 20 described later.

As shown in FIG. 1, the actuating mechanism 20 is a mechanism for tilting the tilting portion 16B in the headrest 16, and is provided from the seat back 14 to the headrest 16. The actuating mechanism 20 includes a reclining rod 12B which is the axis of the seat back 14, a headrest rod 16C which is the axis of the tilting portion 16B, and a wire 22 which connects the reclining rod 12B and the headrest rod 16C. The headrest stay 18 of the present embodiment is a hollow pipe, and the wire 22 is inserted inside the headrest stay 18.

Here, when the seat 10 is viewed from the left side of the vehicle, the wire 22 is wound counterclockwise with respect to the reclining rod 12B fixed to the seat cushion frame 12A. Further, when the seat 10 is viewed from the left side of the vehicle, the wire 22 is wound clockwise around the headrest rod 16C fixed to the tilting portion 16B. Then, in the present embodiment, the tilting portion 16B is pressed so as to always tilt toward the rear side of the seat, and the wire 22 is tensioned so as not to loosen.

In the operating mechanism 20 configured as described above, when the seat back 14 is tilted backward so as to increase the reclining angle, that is, when the seat back 14 is tilted in the horizontal direction, the wire 22 is wound around the reclining rod 12B. That is, the wire 22 is wound around the reclining rod 12B with the seat back 14 as a reference. As a result, the wire 22 is pulled toward the reclining rod 12B (see the arrow in FIG. 2).

On the other hand, in the operating mechanism 20, when the seat back 14 is tilted forward, that is, stands up so that the reclining angle is reduced, the wire 22 is released from the reclining rod 12B. That is, the wire 22 under tension with respect to the seat back 14 is pulled out from the reclining rod 12B. As a result, the wire 22 is sent out to the headrest rod 16C side (see FIG. 1).

(Action effect)
Next, the operation and effect of the sheet 10 according to the present embodiment will be described.

FIG. 1 shows a driving posture in which the seat back 14 stands upright, and FIG. 2 shows a comfortable posture in which the seat back 14 is tilted in the horizontal direction. When shifting from the driving posture shown in FIG. 1 to the comfort posture shown in FIG. 2, the seat 10 operates as follows. First, when the seat back 14 is tilted backward, the wire 22 is wound around the reclining rod 12B fixed to the seat cushion frame 12A, and moves relatively to the reclining rod 12B side inside the seat back 14. On the other hand, in the headrest 16, since the wire 22 is pulled toward the seat back 14, the headrest rod 16C around which the wire 22 is wound from the front of the seat rotates in the direction opposite to the seat back 14. As a result, the tilting portion 16B on which the headrest rod 16C is supported tilts forward with respect to the seat back 14 and the base portion 16A. That is, the tilting portion 16B projects toward the head H side of the occupant P.

On the other hand, when shifting from the comfortable posture shown in FIG. 2 to the driving posture shown in FIG. 1, the operation is the reverse of the above. That is, since the wire 22 is sent to the headrest rod 16C side in response to the forward tilt of the seat back 14, the tilting portion 16B tilts backward of the seat with respect to the seat back 14 and the base portion 16A.

As described above, the tilting of the tilting portion 16B toward the front of the seat with respect to the base portion 16A causes a receiving portion of the head H on the rear side of the seat in the headrest 16 as shown in FIG. As a result, the headrest 16 can wrap the head H of the occupant P.

The seat 10 of the present embodiment can be applied to a vehicle in which automatic driving is performed. Here, with the advancement of autonomous driving, there is a possibility that all occupants will be able to take a comfortable posture by defeating reclining when the vehicle is moving. By the way, even if the headrest is tilted as in the conventional vehicle seat, if the headrest is tilted, the headrest cannot catch the head at the time of a rear collision, and the head escapes diagonally backward. Therefore, there is a limit to the improvement of the injury value at the time of a rear collision with the conventional technique. On the other hand, in the seat 10 of the present embodiment, when the seat back 14 is tilted backward to be in a comfortable posture, the headrest 16 is deformed so as to wrap the head H of the occupant P. That is, according to the present embodiment, the withdrawal of the head is suppressed at the time of the rear collision in the comfortable posture, so that the injury value is reduced.

In this embodiment, the wire 22 is used for the operating mechanism 20, but an independent motor may be used instead of the wire 22. In this case, the tilting portion 16B can be tilted by driving the motor in conjunction with the tilting of the seat back 14.

Further, in the present embodiment, the tilting portion 16B is tilted according to the tilting angle of the seat back 14, but this is not the case. For example, the tilting portion 16B may be tilted when the reclining angle set in advance is exceeded.

(Second embodiment)
The seat 10 of the second embodiment is different from the first embodiment in the structure of the headrest and the operating mechanism. Hereinafter, the differences from the first embodiment will be described. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 3, the headrest 116 of the second embodiment has a base portion 116A provided on the lower side of the seat, that is, a side closer to the seat back 14, and an upper side of the seat, that is, a side far from the seat back 14. The protrusion 116B provided in the above is provided. The base 116A occupies a range of approximately 4/5 of the lower part of the headrest 116, and the protrusion 116B occupies a range of approximately 1/5 of the upper part of the headrest 116. The protruding portion 116B is formed so as to be slidable in front of the seat with respect to the base portion 116A.

The actuating mechanism 120 of the present embodiment is a mechanism for projecting the protruding portion 116B of the headrest 116 toward the front of the seat on the head H side of the occupant P, and is provided from the seat back 14 to the headrest 116. The actuating mechanism 120 is a wire connecting the reclining rod 12B (see FIG. 1), which is the axis of the seat back 14, the headrest rod 116C (see FIG. 3) provided at the base 116A, and the reclining rod 12B and the headrest rod 116C. 22 and. Further, the actuating mechanism 120 includes a pinion 116D into which the headrest rod 116C is inserted, and a rack 116E provided on the lower surface of the protrusion 116B and engaged with the pinion 116D. Further, the actuating mechanism 120 includes a pulley 124 that guides the wire 22. In this embodiment, the protruding portion 116B is always pressed toward the rear side of the seat so that the wire 22 does not loosen.

Here, when the seat 10 is viewed from the left side of the vehicle, the wire 22 is wound clockwise with respect to the headrest rod 116C rotatably supported by the base 116A. Therefore, when the seat back 14 is tilted backward, the wire 22 is pulled toward the seat back 14, so that the headrest rod 116C and the pinion 116D rotate counterclockwise, and the protruding portion 116B protrudes forward of the seat together with the rack 116E (. See the arrow and two-dot chain line in FIG. 3).

Further, when the seat back 14 stands up, the wire 22 is sent out from the seat back 14, so that the headrest rod 116C and the pinion 116D rotate clockwise, and the protrusion 116B is stored in the headrest 116 together with the rack 116E.

Although FIG. 3 is shown so that the headrest 116 itself is not tilted, it goes without saying that the headrest 116 tilts together with the seat back 14.

According to the second embodiment, as in the first embodiment, when the seat back 14 is tilted backward to be in a comfortable posture, the headrest 116 is deformed so as to wrap the head H of the occupant P. That is, as in the first embodiment, the head detachment is suppressed at the time of the rear collision in the comfortable posture, so that the injury value is reduced.

In this embodiment, the wire 22 is used for the operating mechanism 120, but an independent motor may be used instead of the wire 22. In this case, the protrusion 116B can be projected by driving the motor in conjunction with the backward tilt of the seat back 14.

Further, in the present embodiment, the protruding portion 116B is projected according to the tilting angle of the seat back 14, but this is not the case. For example, the protrusion 116B may be projected when the reclining angle set in advance is exceeded.

(Third embodiment)
The seat 10 of the third embodiment is different from the first and second embodiments in the structure of the headrest and the operating mechanism. Hereinafter, the differences from the first embodiment will be described. The same components as those of the other embodiments are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 4, the headrest 216 of the third embodiment has a base portion 216A having an inverted L-shaped cross section when the seat 10 is viewed from the left side of the vehicle, and a recessed portion on the front side and the lower side of the seat of the base portion 216A. It is provided with a movable portion 216D provided on the 216B. The movable portion 216D is formed so as to be slidable behind the seat with respect to the recessed portion 216B.

Further, the headrest 216 is provided with a spring 216E which is a pressing member that presses the movable portion 216D toward the front of the seat. Here, the base portion 216A includes a protruding portion 216C in which the upper side of the seat of the recessed portion 216B projects to the front of the seat. Therefore, in the headrest 216, when the movable portion 216D is located at the end in front of the seat, it forms the same surface as the protruding portion 216C, but the movable portion 216D is slid to the rear of the seat, so that the protruding portion 216C Protrudes relatively toward the head H side, which is in front of the seat.

The actuating mechanism 220 of the present embodiment is a mechanism for sliding the movable portion 216D to the rear of the seat in the headrest 216, and is provided from the seat back 14 to the headrest 216. The actuating mechanism 220 includes a reclining rod 12B (see FIG. 1), which is the axis of the seat back 14, and a wire 22 (see FIG. 4) connecting the reclining rod 12B and the movable portion 216D. Further, the operating mechanism 220 includes a pulley 224 that guides the wire 22.

In the present embodiment, when the seat back 14 is tilted backward, the movable portion 216D slides behind the seat by pulling the wire 22 toward the seat back 14 (see the arrow and the alternate long and short dash line in FIG. 4). Further, when the seat back 14 stands up, the wire 22 is sent out from the seat back 14, and the movable portion 216D slides in front of the seat due to the pressing force of the spring 216E.

According to the third embodiment, when the seat back 14 is tilted backward to be in a comfortable posture, the movable portion 216D on the lower side of the seat slides to the rear of the seat, so that the protruding portion 216C on the upper side of the seat is relative to each other. It protrudes toward the H side of the head. According to the third embodiment, as in the first embodiment, when the seat back 14 is tilted backward to be in a comfortable posture, the headrest 216 is deformed so as to wrap the head H of the occupant P. That is, as in the first embodiment, the head detachment is suppressed at the time of the rear collision in the comfortable posture, so that the injury value is reduced.

In this embodiment, the wire 22 is used for the operating mechanism 220, but an independent motor may be used instead of the wire 22. In this case, the movable portion 216D can be slid to the rear of the seat by driving the motor in conjunction with the backward tilt of the seat back 14.

Further, in the present embodiment, the movable portion 216D is slid to the rear of the seat according to the tilting angle of the seat back 14, but this is not the case. For example, the movable portion 216D may be slid to the rear of the seat when the reclining angle set in advance is exceeded.

(Fourth Embodiment)
The seat 10 of the fourth embodiment is different from the first to third embodiments in the structure of the headrest and the operating mechanism. Hereinafter, the differences from the first embodiment will be described. The same components as those of the other embodiments are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 5, the headrest 316 of the fourth embodiment has a base portion 316A having an inverted L-shaped cross section when the seat 10 is viewed from the left side of the vehicle, and a recessed portion on the front side and the lower side of the seat of the base portion 316A. It is provided with a movable portion 316D provided on the 316B. The movable portion 316D is formed so as to be slidable behind the seat with respect to the recessed portion 316B.

Further, in the recessed portion 316B, a bladder 326, which will be described later, constituting the operating mechanism 320 is provided between the base portion 316A and the movable portion 316D in the front-rear direction of the seat. Here, the base portion 316A includes a protruding portion 316C in which the upper side of the seat of the recessed portion 316B protrudes in front of the seat. Therefore, in the headrest 316, when the movable portion 316D is located at the end in front of the seat, it forms the same surface as the protruding portion 316C, but the movable portion 316D is slid to the rear of the seat, so that the protruding portion 316C Protrudes relatively toward the head H side, which is in front of the seat.

The operating mechanism 320 of the present embodiment is a mechanism for sliding the movable portion 316D to the rear of the seat in the headrest 316, and is provided from the seat back 14 to the headrest 316. The actuating mechanism 320 includes a pump 322 and a valve 324 provided in the seat back 14, and a bladder 326 which is an air bag provided in the headrest 316. Further, the operating mechanism 320 includes a hose 328 forming a flow path from the pump 322 to the bladder 326 via the valve 324.

In the present embodiment, in the driving posture, the bladder 326 expands due to the operation of the pump 322, so that the movable portion 316D forms the same surface as the protruding portion 316C. On the other hand, when the seat back 14 is tilted backward to be in a comfortable posture, the valve 324 opens and the movable portion 316D slides to the rear of the seat, so that the protruding portion 316C on the upper side of the seat is relatively toward the front of the seat. Protruding (see arrow and alternate long and short dash line in FIG. 5).

As described above, according to the fourth embodiment, when the seat back 14 is tilted backward and takes a comfortable posture, the headrest 316 is deformed so as to wrap the head H of the occupant P, as in the third embodiment. That is, as in the third embodiment, the head detachment is suppressed at the time of the rear collision in the comfortable posture, so that the injury value is reduced.

In the present embodiment, even if the movable portion 316D is slid to the rear of the seat according to the tilting angle of the seat back 14, the movable portion 316D is slid to the rear of the seat when the reclining angle set in advance is exceeded. However, any form can be taken.

(supplement)
The seat 10 of each of the above-described embodiments is effective at the time of a rear collision when the occupant P is seated facing the front direction of the vehicle, but is effective at the time of a front collision when the occupant P is applied to a seat seated facing the rear of the vehicle. It becomes effective in.

In the first to third embodiments, the operating mechanism in which the wire 22 is directly wound around the reclining rod 12B is adopted, but the present invention is not limited to this. For example, in the actuating mechanism, the wire 22 may be wound around a drum that rotates in conjunction with the reclining rod 12B, or the wire 22 may be connected to the tip of a link that operates in conjunction with the reclining rod 12B.

Further, in each embodiment, the upper side of the seat of the headrest is deformed so as to wrap the head H of the occupant P by projecting relatively to the lower side of the seat, but further deformed, for example, the face of the occupant P. It may be deformed so as to cover up to. This makes it possible to hide the sleeping face and block the sunlight. In other words, depending on the design of the upper part of the headrest, it is possible not only to reduce the injury value in the comfortable posture but also to make it compatible with the partition for creating a private space.

10 seats (vehicle seats)
14 Seatback 16 Headrest 16A Base (closer to the seatback)
16B tilting part (side far from the seat back)
116 Headrest 116A Base (closer to the seat back)
116B Protruding part (far side from the seat back)
216 Headrest 216C Protruding part (far side from the seat back)
216D movable part (side near the seat back)
316 Headrest 316C Protruding part (far side from the seat back)
316D movable part (side near the seat back)
P Crew H Head

Claims (1)

A seat back that can be tilted around the width of the vehicle,
A headrest including an upper part of the headrest that supports the occupant's head on the side far from the seatback and a lower part of the headrest that supports the head on the side close to the seatback.
The headrest is
One of the upper part of the headrest and the lower part of the headrest can move independently from the other of the upper part of the headrest and the lower part of the headrest.
When the seat back is tilted backward in the horizontal direction and is in a comfortable position, the upper part of the headrest protrudes toward the head side relative to the lower part of the headrest, so that the headrest is the head of the occupant. A vehicle seat configured to wrap around .

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