JP2023155787A - vehicle seat - Google Patents

Abstract

To obtain a vehicle seat which enables reduction of an input load applied to a lumbar spine of an occupant even if the occupants assumes a comfort posture during a frontal collision of a vehicle.SOLUTION: A vehicle seat 10 includes: a vehicle seat body 10A; slide mechanisms 50 which enable the vehicle seat body 10A to slide on seat rails 102 positioned at both sides as seen in a seat width direction of the vehicle seat body 10A in a vehicle anteroposterior direction; a lock mechanism 60 which locks the vehicle seat body 10A relative to the seat rails 102 and releases the lock state when a front load exceeding a predetermined value which is set in advance acts during a frontal collision; a downward extension part 30 extending from a lower surface of the vehicle seat body 10A to the lower side of the seat; a standing wall part 70 fixed to a vehicle floor 100, on which the seat rails 102 are disposed, and erected to the vehicle upper side; and an energy absorption member 80 which is provided in at least one of the downward extension part 30 and the standing wall part 70 and compressed between the downward extension part 30 and the standing wall part 70.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vehicle seat.

The development of vehicles equipped with self-driving functions is gaining momentum, and it is expected that in the future, during self-driving, many people will take a comfortable position (reclining position) with the seat back tilted backwards. Therefore, Patent Document 1 discloses that when a mode changeover switch is operated in an automatic driving state, a posture change process is performed in which a reclining device rocks the seatback backwards and a lifter device displaces the cushion panel upward. discloses a seat control system that suppresses downward displacement of the back of a seated person with respect to the seat back.

Japanese Patent Application Publication No. 2020-131747

In general, when the occupant is in a comfortable posture, it is more difficult to restrain the occupant in the event of a frontal collision of the vehicle than when the occupant is in a normal posture, and the submarine phenomenon is more likely to occur. Therefore, if the seatbelt restraint is insufficient, there is a risk that the input load to the lumbar vertebrae will be insufficiently suppressed.

The present invention has been made in consideration of the above facts, and an object of the present invention is to provide a vehicle seat that can reduce the input load to the lumbar vertebrae of an occupant even when the occupant is in a comfortable posture at the time of a frontal collision of the vehicle.

The vehicle seat according to the present invention according to claim 1 includes a vehicle seat body, and the vehicle seat body is slidable in the longitudinal direction of the vehicle on seat rails located on both sides of the vehicle seat body in the seat width direction. a locking mechanism that locks the vehicle seat body with respect to the seat rail and releases the locked state when a frontal load exceeding a preset value is applied during a frontal collision; A lower extension part extending from the lower surface of the vehicle seat body toward the lower part of the seat, a standing wall part fixed to the vehicle floor on which the seat rail is arranged and erected toward the upper part of the vehicle, and the lower extension part. and an energy absorbing member that is provided on at least one of the extending portion and the standing wall portion, and is compressed between the downwardly extending portion and the standing wall portion.

The vehicle seat according to the present invention according to claim 1 includes a vehicle seat body, a slide mechanism that allows the vehicle seat body to slide in the longitudinal direction of the vehicle on the seat rail, and a vehicle seat with respect to the seat rail. The vehicle is equipped with a locking mechanism that locks the main body and releases the locked state when a frontal load exceeding a predetermined value is applied during a frontal collision. Therefore, when a front load exceeding a predetermined value acts on the lock mechanism during a frontal collision of the vehicle, the locked state of the lock mechanism is released and the vehicle seat body can slide on the seat rail in the longitudinal direction of the vehicle.

Further, the vehicle seat according to the present invention according to claim 1 has a downward extending portion extending from the lower surface of the vehicle seat body toward the bottom of the seat, and a seat rail that is fixed to the vehicle floor on which the seat rail is arranged. The vehicle includes a standing wall portion erected toward the top of the vehicle, and an energy absorbing member that is provided on at least one of the downward extending portion and the standing wall portion and is compressed between the downward extending portion and the standing wall portion. Therefore, when the locking mechanism is released during a frontal collision and the vehicle seat body moves forward due to inertia force, the energy absorbing member is compressed between the downwardly extending portion and the vertical wall portion. As a result, in the event of a frontal collision of a vehicle, the energy absorption member suppresses the forward movement of the vehicle seat body while absorbing energy, reducing the input load to the occupant's lumbar vertebrae even if the occupant is in a comfortable posture. It can be reduced.

As described above, the vehicle seat according to the present invention has the excellent effect of reducing the input load to the lumbar vertebrae of the occupant during a frontal collision of the vehicle even when the occupant is in a comfortable posture.

FIG. 1 is a schematic side sectional view of a vehicle seat in a comfortable posture according to an embodiment of the present invention. FIG. 2 is a plan view of the vehicle seat shown in FIG. 1 with a portion of the vehicle seat main body section removed. (a) A schematic side view of the right lock mechanism seen from the inside in the vehicle width direction, (b) A sectional view of the right lock mechanism seen from the rear side, (b) A schematic side view of the right lock mechanism seen from the top. It is a top view (c). FIG. 2 is a schematic side view illustrating energy absorption of an aluminum cylinder. 5 is a side cross-sectional view within frame A of FIG. 4. FIG. FIG. 1 is a schematic side sectional view of the vehicle seat according to an embodiment of the present invention in a comfortable posture at the time of a frontal collision.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle seat 10 according to an embodiment of the present invention will be described below with reference to the accompanying drawings. Note that, in this specification and the drawings, components having substantially the same functional configurations are designated by the same reference numerals and redundant explanation will be omitted. Further, arrow UP, arrow FR, arrow LH, and arrow RH shown as appropriate in each figure indicate the upper direction, the front direction, the left direction and the right direction in the left and right direction (vehicle width direction) of the vehicle seat 10 mounted on the vehicle. are shown respectively. Hereinafter, when a description is simply made using front and rear, left and right, and up and down directions, unless otherwise specified, front and rear in the front and back direction, left and right in the left and right direction (vehicle width direction), and top and bottom of the vehicle seat 10 installed in the vehicle. It shall indicate the up and down directions.

(Configuration of vehicle seat)
The vehicle seat 10 of the first embodiment is installed in a vehicle (for example, a car, a train, etc.). In this embodiment, the vehicle seat 10 is, for example, a left front seat in a vehicle. As shown in FIG. 1, the vehicle seat 10 includes a seat cushion 12 on which an occupant sits (supports the buttocks and thighs of the occupant), and a seat back 14 that supports the occupant's back, that is, constitutes a backrest. and a headrest 16 that supports the head of the occupant.

The seat cushion 12 includes a cushion pad 18, a seat pan 20, and a seat skin (not shown).

The cushion pad 18 constitutes a seating surface portion of the vehicle seat 10, and is made of, for example, an elastic synthetic resin material such as polyurethane foam (expanded polyurethane). The occupant is seated on the upper side of the seat cushion 12 (seat surface). Further, the cushion pad 18 includes a submarine prevention portion 22 on the lower side of the front portion in the longitudinal direction of the vehicle.

The submarine prevention portion 22 is a member for preventing an occupant seated on the vehicle seat 10 from slipping off the vehicle seat 10 in the event of a frontal collision, and is made of, for example, a member with higher hardness than the cushion pad 18. ing. Specifically, it is formed integrally with the cushion pad 18 from a synthetic resin material such as polyurethane foam.

The seat pan 20 is a frame that constitutes the skeleton of the seat cushion 12, and includes a recess 20A in which the cushion pad 18 is installed above. The seat skin is made of a flexible sheet member such as cloth, leather, or synthetic leather. The seat cushion 12 is constructed by attaching a cushion pad 18 to the recess 20A of the seat pan 20 and covering the surface thereof with a seat skin.

Further, on the lower surface of the seat pan 20, seat leg portions 24 (that is, four seat leg portions 24) are provided at the front and rear sides on both the left and right sides. Each of the seat legs 24 is provided with a lifter device (not shown), and the front seat leg 24 and the rear seat leg 24 are configured to be able to extend and contract independently in the vertical direction. In this embodiment, as an example, when the seat back 14 is tilted rearward to take a comfortable posture described later, the front seat leg 24 is expanded and contracted to be higher than the rear seat leg 24. .

Further, on the lower surface of the seat pan 20, a lower extending portion 30 is provided that extends downward at the center portion of the seat pan 20 in the front-rear direction and the center portion in the left-right direction. The lower extending portion 30 has a rigidity that does not deform when it collides with an aluminum cylinder 80, which will be described later. Note that the lower extension portion 30 will be explained in detail later.

On the other hand, the seat back 14 constitutes a backrest portion of the vehicle seat 10, and supports the back of an occupant seated on the seat cushion 12 on the front side (seat surface) of the seat back 14. The seat back 14 includes a seat back frame 26, a seat back pad 28, and a seat skin.

The seat back frame 26 constitutes the skeleton of the seat back 14. The seat back pad 28 is made of, for example, an elastic synthetic resin material such as polyurethane foam. The seat skin is made of a flexible sheet member such as cloth, leather, or synthetic leather. The seat back 14 is constructed by attaching a seat back pad 28 to a seat back frame 26 and covering the surface thereof with a seat skin.

The vehicle seat 10 also includes a reclining device 40. The reclining device 40 is a known device that rotates the seat back 14 around the reclining center C and adjusts the angle of the seat back 14 with respect to the seat cushion 12. For example, the reclining device 40 uses an electric actuator to transmit force to the seat back frame 26, thereby causing the seat back frame 26 to swing in the seat longitudinal direction relative to the seat pan 20.

In this embodiment, as shown in FIG. 1, the angle R between the floor 100 of a vehicle (not shown) on which the vehicle seat 10 is mounted and the seat back 14 is approximately 40° to 60°. The state in which the seat back 14 is tilted backward by the reclining device 40 is defined as a comfortable posture (reclining posture).

Here, in this embodiment, a configuration including the above-described seat cushion 12, seat back 14, headrest 16, and seat legs 24 is referred to as a vehicle seat main body 10A. As shown in FIGS. 1 and 2, the vehicle seat bodies 10A are installed on the floor 100 of a vehicle (not shown) in which the vehicle seat 10 is mounted at intervals in the vehicle width direction, and each The vehicle is slidable in the longitudinal direction of the vehicle on two seat rails 102 fixed in the longitudinal direction by bolts 104.

In this embodiment, the seat rails 102 are a pair of left and right lower rails, and, as shown in FIG. 3(b), are configured in a long cylindrical shape with a rectangular cross section. Further, as an example, a plurality of lock holes 102A are provided on opposing surfaces of the seat rail 102 at predetermined intervals in the longitudinal direction.

On the other hand, the vehicle seat 10 of this embodiment includes a slide mechanism 50 and a lock mechanism 60. The slide mechanism 50 allows the vehicle seat body 10A to slide in the longitudinal direction of the vehicle on seat rails 102 located on both sides of the vehicle seat body 10A in the seat width direction. Specifically, the slide mechanism 50 includes, for example, upper rails 52 provided at the lower ends of the four seat legs 24, as shown in FIGS. 2 and 3(b). The upper rail 52 is formed into a rectangular cylindrical shape with its lower side, that is, the seat rail 102 side open, and is disposed to cover the seat rail 102 from above and is slidable on the seat rail 102.

A known mechanism can be used as the locking mechanism 60, and as an example, as shown in FIGS. 3(a) to 3(c), a locking claw 62 is provided. The lock pawl 62 is formed in a cylindrical shape so as to be inserted into the lock hole 102A of the seat rail 102 described above, and is provided in a protruding manner on the inner side surface of the upper rail 52. The lock claw 62 is urged toward the seat rail 102 by, for example, a biasing member (not shown) such as a coil spring. Further, the lock claw 62 is provided with a pressing member (not shown) as an example, and the lock claw 62 can be moved in a direction against the urging force of the urging member by this pressing member.

Then, when the pressing member is pressed, in a position where the lock hole 102A is not present, the lock claw 62 resists the urging force of the urging member and contacts the side surface of the seat rail 102, or is slightly separated from the side surface. while moving along the seat rail 102. Note that the side wall 54 of the upper rail 52 provided with the lock claw 62 has elasticity, so that when moving along the seat rail 102, the tip of the lock claw 62 is positioned outward from the side surface of the seat rail. It is elastically deformed until

On the other hand, when the pressing member is not pressed at the position where the lock hole 102A exists, the lock pawl 62 is inserted through the lock hole 102A by the urging force (elastic restoring force) of the urging member. Thereby, at the position of the lock hole 102A, the lock claw 62 locks the longitudinal movement of the upper rail 52, that is, the seat rail 102 of the vehicle seat body 10A.

In this embodiment, the locking mechanism 60 releases the locked state when a frontal load exceeding a predetermined value is applied during a frontal collision. Specifically, the lock claw 62 breaks.

Further, as shown in FIG. 1, the vehicle seat 10 is fixed to a floor 100 on which a seat rail 102 is disposed, and includes a standing wall portion 70 that is erected toward the top of the vehicle. As shown in FIG. 2, the standing wall portion 70 is made of an L-shaped plate. The vertical wall portion 70 is L-shaped, with one side serving as a fixing portion 72 and the other side serving as a standing wall body portion 74 . The lower surface of the fixing portion 72 is placed on the floor 100 and is fixed to the floor 100 with bolts 76 . The vertical wall main body section 74 is erected from the floor 100, and an aluminum cylinder 80, which will be described later, is fixed thereto.

The vehicle seat 10 further includes an aluminum cylinder 80 as an energy absorbing member that is provided on the vertical wall main body 74 and compressed between the downward extension 30 and the vertical wall main body 74. The aluminum cylinder 80 is made of aluminum and includes a cylindrical portion 82 and a flange portion 84 formed at one end of the cylindrical portion 82. The flange portion 84 is formed by being bent outward from one end of the cylindrical portion 82 at a substantially right angle, and is formed into a disk shape. For example, four holes 84A are formed at equal intervals in the flange portion 84. With the end surface 84B of the flange portion 84 (the end surface of the aluminum cylinder 80 on the flange portion 84 side) in contact with the vertical wall body portion 74, insert the bolt 86 into the hole 84A, and insert the nut 88 from the back side of the vertical wall body portion 74. The aluminum cylinder 80 is fixed to the vertical wall portion 70 by fastening the aluminum cylinder 80 to the vertical wall portion 70.

Here, as shown in FIG. 1, the aluminum cylinder 80 has at least a part, preferably all, of the front surface 30A of the lower extension part 30, and the end face 82A of the aluminum cylinder 80 on the lower extension part 30 side (seat rear side). It is placed in a position facing all of them.

As shown in FIG. 4, when a load F is applied to the end surface 82A, the cylindrical portion 82 of the aluminum cylinder 80 rolls the end surface 82A outward (see arrow M) as shown in FIG. It has the property of absorbing impact by deforming in the direction of contraction.

(Actions and effects of embodiments)
Next, the functions and effects of the vehicle seat 10 according to the present embodiment configured as above will be explained.

The vehicle seat 10 according to the present embodiment includes a vehicle seat main body 10A, a slide mechanism 50 that allows the vehicle seat main body 10A to slide in the longitudinal direction of the vehicle on the seat rail 102, and a vehicle seat relative to the seat rail 102. The vehicle includes a locking mechanism 60 that locks the main body 10A and releases the locked state when a frontal load exceeding a predetermined value is applied during a frontal collision. Therefore, when a front load exceeding a predetermined value acts on the lock mechanism 60 during a frontal collision of the vehicle, the lock pawl 62 breaks and the lock mechanism 60 is unlocked, and the vehicle seat body 10A is lifted onto the seat rail 102. can be slid in the front and rear directions of the vehicle.

The vehicle seat 10 is fixed to a floor 100 on which a seat rail 102 and a downwardly extending portion 30 extending from the lower surface of the vehicle seat main body 10A toward the bottom of the seat are provided, and is erected toward the top of the vehicle. The vertical wall main body part 74 of the vertical wall part 70 is provided, and an aluminum cylinder 80 is provided on the vertical wall main body part 74 and is compressed between the downwardly extending part 30 and the vertical wall main body part 74. Therefore, as shown in FIG. 6, when the locking mechanism 60 is released during a frontal collision and the vehicle seat body 10A moves forward (arrow D in FIG. 6) due to inertia, the lower extension portion 30 It collides with the aluminum cylinder 80.

Therefore, as shown in FIG. 4, the cylindrical portion 82 of the aluminum cylinder 80 has a load F applied to the end surface 82A, so as shown in FIG. The portion 82 is deformed in the shrinking direction and compressed between the downwardly extending portion 30 and the vertical wall portion 70 (vertical wall main body portion 74). As a result, in the event of a frontal collision of the vehicle, the forward movement of the vehicle seat body 10A is suppressed by the aluminum cylinder 80 while absorbing energy, so that even if the occupant is in a comfortable posture, the input load to the lumbar vertebrae of the occupant is reduced. can be reduced.

In this embodiment, the aluminum cylinder 80 deforms in the direction in which the cylindrical portion 82 contracts while rolling the end surface 82A outward when absorbing energy, but the present invention is not limited to this. As long as energy can be absorbed, for example, the outer circumferential wall of the cylindrical portion 82 may be deformed in a wavy manner so as to shrink, or may be deformed so as to be bent in all directions.

Further, in this embodiment, the aluminum cylinder 80 is used as the energy absorbing member, but the present invention is not limited to this. Any member capable of absorbing energy may be used, such as a urethane member.

Further, in the present embodiment, the aluminum cylinder 80 as an energy absorbing member is provided on the vertical wall portion 70, but the present invention is not limited thereto, and may be provided on the downwardly extending portion 30. Further, for example, when the energy absorbing member is a urethane member, it may be provided on both the vertical wall portion 70 and the downwardly extending portion 30.

Further, in this embodiment, the lock mechanism 60 uses a cylindrical lock pawl 62, but the present invention is not limited to this. Any shape or configuration can be used as long as the vehicle seat body 10A can be locked at any position on the seat rail 102 and the locked state can be released when a front load exceeding a preset value is applied. Well-known techniques can also be used.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and can be implemented with various modifications other than the above without departing from the spirit thereof. Of course.

10 Vehicle seat 10A Vehicle seat body 100 Floor (vehicle floor)
102 Seat rail 30 Lower extension part 50 Slide mechanism 60 Lock mechanism 70 Standing wall part 80 Energy absorption member

Claims (1)

A vehicle seat body,
a slide mechanism that allows the vehicle seat body to slide in the longitudinal direction of the vehicle on seat rails located on both sides of the vehicle seat body in the seat width direction;
a locking mechanism that locks the vehicle seat body with respect to the seat rail and releases the locked state when a frontal load exceeding a predetermined value is applied during a frontal collision;
a downwardly extending portion extending from the lower surface of the vehicle seat body toward the bottom of the seat;
a standing wall portion fixed to the vehicle floor on which the seat rail is arranged and erected toward the top of the vehicle;
an energy absorbing member that is provided on at least one of the downwardly extending portion and the standing wall and is compressed between the downwardly extending portion and the standing wall;
A vehicle seat equipped with