JP2019156292A - Vehicular seat - Google Patents

Abstract

A vehicle seat capable of suppressing the occurrence of the submarine phenomenon regardless of the occupant's body type. A vehicle seat (10) is configured to be able to support a thigh (D) and a buttocks (B) of an occupant (P), a hard portion (22) located on the front side of the seat, and a occupant (P) on the seat rear side of the hard portion (22). A seat cushion 12 including a seat cushion pad 20 that supports the ischial S and includes a hardness changing portion 24 that is softer than a hard portion when a collision in which the occupant P inertia moves to the front of the seat is predicted or detected. And a seat back 14 connected to an end of the seat cushion 12 on the rear side of the seat, and a boundary portion 22A between the hard portion 22 and the hardness changing portion 24 is formed from above the seat as viewed in the seat width direction. The seat is inclined toward the front of the seat as it goes downward. [Selection] Figure 3

Description

  The present invention relates to a vehicle seat.

  Patent Document 1 discloses a vehicle seat provided with a seat cushion that supports an occupant's buttocks and thighs. Further, in the vehicle seat of Patent Document 1, the rear part of the cushion pad is supported by the stretched elastomer sheet, and the rear part of the cushion pad falls to the lower side of the seat by loosening the elastomer sheet when the vehicle collides. Make it. On the other hand, Patent Document 2 discloses a vehicle seat in which an air cushion is disposed below the rear portion of the cushion pad, and the rear portion of the cushion pad is placed on the lower side of the seat by contracting the air cushion when the vehicle collides. Depressed.

Japanese Patent Laid-Open No. 2004-237819 JP 2004-268692 A

  In the vehicle seats disclosed in Patent Literature 1 and Patent Literature 2 described above, the rear portion of the cushion pad is lowered to the lower side of the seat when the vehicle collides, thereby suppressing the occurrence of a so-called submarine phenomenon in which the occupant slides down from the seat cushion. ing. However, there is room for improvement because there is a possibility that the cushion pad cannot be sufficiently lowered to the lower side of the seat, such as when an occupant with a light weight is seated.

  In view of the above facts, the present invention has an object to obtain a vehicle seat that can suppress the occurrence of a submarine phenomenon regardless of the occupant's body shape.

  The vehicle seat according to the first aspect of the present invention is configured to be able to support the thigh and buttocks of the occupant, the hard portion positioned on the front side of the seat, and the sciatic bone of the occupant on the seat rear side of the hard portion And a seat cushion including a seat cushion pad including a hardness change portion softened from the hard portion at the time of prediction or detection of a collision in which an occupant inertially moves forward of the seat, and the seat cushion A boundary portion between the hard part and the hardness change part as viewed from the seat width direction toward the seat lower side. Inclined to the side.

  According to a first aspect of the present invention, the vehicle seat includes a seat cushion configured to be able to support an occupant's thigh and buttocks and a seat back connected to an end portion of the seat cushion on the seat rear side. The seat cushion includes a seat cushion pad, and the seat cushion pad includes a hard portion positioned on the front side of the seat and a hardness changing portion that supports the sciatic bone of the occupant on the rear side of the seat with respect to the hard portion. It is configured to include. Here, the hardness changing portion is softer than the hard portion at the time of prediction or detection of a collision in which the occupant inertially moves to the front side of the seat. As a result, the sciatic bone of the occupant sinks, and the movement of the occupant forward of the seat is suppressed by the hard portion.

  Further, the boundary portion between the hard portion and the hardness changing portion is inclined toward the front side of the seat as it goes from the upper side of the seat to the lower side of the seat as seen from the seat width direction. Thereby, regardless of the occupant's body shape, a reaction force can be applied to the occupant in the direction of pushing down the sciatica from the hard portion. The “hard portion” as used herein is not limited to a configuration that is harder than a general seat cushion pad, and may be a general seat as long as it is harder than a softened hardness change portion. It may be as hard as a cushion pad.

  As described above, the vehicle seat according to claim 1 has an excellent effect that the occurrence of the submarine phenomenon can be suppressed regardless of the occupant's body shape.

It is a perspective view which shows the principal part of the vehicle seat which concerns on 1st Embodiment. It is an expanded sectional view which expands and shows the state cut | disconnected by the 2-2 line | wire of FIG. 1, and is a figure which shows the state before a hardness change part softens in the state which the passenger | crew sat down. It is an expanded sectional view corresponding to FIG. 2, and is a figure which shows the state which the hardness change part softened from the state of FIG. FIG. 4 is an enlarged cross-sectional view corresponding to FIG. 3, showing a vehicle seat according to a second embodiment, and showing both a state before the hardness change portion is softened and a state where the hardness change portion is softened. It is. It is an expanded sectional view corresponding to Drawing 2, showing the vehicle seat concerning a 3rd embodiment, and is a figure showing the state before a hardness change part softens. It is an expanded sectional view corresponding to Drawing 5, and is a figure showing the state where the hardness change part softened from the state of Drawing 5.

<First Embodiment>
Hereinafter, the vehicle seat 10 according to the first embodiment will be described with reference to FIGS. In addition, an arrow FR appropriately shown in each drawing indicates a seat front direction, an arrow UP indicates a seat upward direction, and an arrow RH indicates a seat right direction. Hereinafter, when the description is made using the front-rear, left-right, upper-lower directions, unless otherwise specified, the front-rear direction of the seat, the left-right direction of the sheet width direction, and the upper-lower direction of the sheet are shown. In the present embodiment, as an example, the seat front side coincides with the vehicle front side, and the seat width direction coincides with the vehicle width direction.

  As shown in FIG. 1, the vehicle seat 10 of the present embodiment mainly includes a seat cushion 12, a seat back 14, and a headrest 16. As shown in FIG. 2, the seat cushion 12 is configured to be able to support the thigh D and the buttocks B of the occupant P. Details of the seat cushion 12 will be described later.

  As shown in FIG. 1, a seat back 14 is connected to an end portion of the seat cushion 12 on the seat rear side so as to be tiltable with respect to the seat cushion 12. The seat back 14 extends in the vertical direction of the seat and is configured to be able to support the back (not shown) of the occupant P. A recliner (not shown) is provided at a connecting portion between the seat cushion 12 and the seat back 14, and the seat back 14 can be tilted at an arbitrary angle with respect to the seat cushion 12 by operating the recliner.

  A headrest 16 is attached to the upper end of the seat back 14, and the headrest 16 is configured to support the head (not shown) of the occupant P. The vehicle seat 10 is provided with a seat belt device (not shown). The seat belt device includes a shoulder belt that restrains the upper body of the occupant P and a lap belt that restrains the waist of the occupant P. It consists of

  As shown in FIG. 2, the seat cushion 12 includes a flat seat pan 18 that constitutes a part of the seat cushion frame. A seat cushion pad 20 is supported on the upper surface of the seat pan 18.

  The seat cushion pad 20 is provided from the front end portion to the rear end portion of the seat cushion 12, and the outer surface of the seat cushion pad 20 is covered with a seat skin 26.

  Here, the seat cushion pad 20 of the present embodiment includes a hard pad 22 as a hard portion and an electric field responsive ionized gel member 24 (hereinafter referred to as “ionized gel member 24” as appropriate) as a hardness changing portion. It is comprised including. The hard pad 22 constitutes the seat front side of the seat cushion pad 20, and as an example in the present embodiment, the hard pad 22 is provided up to a position offset slightly toward the seat front side from the middle portion of the seat cushion pad 20 in the seat front-rear direction. ing.

  The ionized gel member 24 is provided from a position slightly offset to the front side of the seat from the middle part of the seat cushion pad 20 in the front-rear direction of the seat to the rear end portion of the seat cushion pad 20. The sciatic bone S of the occupant P seated by the ionized gel member 24 is supported. Specifically, the ionized gel member 24 is provided at a position where the sciatic bone S of the occupant P is supported in a state where the ionized gel member 24 is seated in a standard seating posture determined by the collision test method.

  The ionized gel member 24 is formed by filling an electric field-responsive ionized gel in a gel cover (not shown). And this electric field responsive ionization gel is a material which can change intensity | strength (hardness) by applying a voltage or changing an applied voltage. In the state of FIG. 2, it is the same level as a normal seat cushion pad. It is said to be hard.

  A voltage control unit 28 for applying a voltage to the electric field responsive ionized gel is electrically connected to the ionized gel member 24. The voltage control unit 28 is configured to apply an arbitrary voltage based on a signal from a control unit such as an ECU (not shown).

  The ECU is electrically connected to a collision prediction sensor and a collision detection sensor (not shown), and predicts or detects a vehicle collision based on signals from these sensors. When a collision in which the occupant P inertially moves toward the front of the seat is predicted or detected by the collision prediction sensor and the collision detection sensor, a predetermined voltage is applied to the electric field responsive ionization gel of the ionization gel member 24, or The voltage applied to the electric field responsive ionized gel is changed to soften the electric field responsive ionized gel. For this reason, the ionized gel member 24 is softened more than the hard pad 22. Here, “the collision in which the passenger P inertially moves to the front side of the seat” refers to a collision such as a frontal collision when the front side of the seat and the front side of the vehicle coincide with each other, and the front side of the seat is the rear side of the vehicle. When facing the direction, it refers to a collision such as a rear collision.

  Here, the boundary portion between the hard pad 22 and the ionized gel member 24 is inclined toward the front side of the seat as it goes from the upper side of the seat to the lower side of the seat as seen from the seat width direction. Specifically, the rear surface 22A of the hard pad 22 facing the rear side of the seat is inclined toward the front side of the seat as it goes from the upper side of the seat to the lower side of the seat as seen from the seat width direction.

(Function and effect)
Next, the operation and effect of this embodiment will be described.

  In the vehicle seat 10 according to the present embodiment, the hardness of the ionized gel member 24 is equivalent to that of a general seat cushion pad before the vehicle collides. For this reason, even if it replaces with a normal seat cushion pad and the structure which supported the passenger's P sciaticus S with the ionization gel member 24, riding comfort is not impaired.

  Further, the ionized gel member 24 is softer than the hard pad 22 at the time of prediction or detection of a collision in which the occupant P inertially moves to the front side of the seat, and the sciatic bone S of the occupant P is ionized gel member as shown in FIG. Sink into 24. As a result, the thigh D is lifted relatively, and the movement of the sciatic S is stopped by the hard pad 22 when the sciatic S of the occupant P sinking into the ionized gel member 24 attempts to move inertially toward the front side of the seat. Thus, movement of the passenger P on the front side of the seat is suppressed. In addition, in FIG. 3, the passenger | crew P in the state before the ionization gel member 24 softens is drawn with the dashed-two dotted line.

  Further, in the present embodiment, the boundary portion between the hard pad 22 and the ionized gel member 24 is inclined toward the front side of the seat as it goes from the upper side of the seat to the lower side of the seat as seen from the seat width direction. Thereby, regardless of the body shape of the occupant P, a reaction force can be applied to the occupant P in the direction in which the sciatic bone S is pushed down from the hard pad 22 to the rear of the seat and downward. As a result, the occurrence of the submarine phenomenon can be suppressed regardless of the body shape of the passenger P.

Second Embodiment
Next, the vehicle seat 30 according to the second embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the structure similar to 1st Embodiment, and description is abbreviate | omitted suitably.

  As shown in FIG. 4, the vehicle seat 30 of the present embodiment has the same configuration as that of the first embodiment except for the seat cushion pad 34. In other words, the seat cushion 32 includes a flat seat pan 18 that constitutes a part of the seat cushion frame. A seat cushion pad 34 is supported on the upper surface of the seat pan 18, and the outer surface of the seat cushion pad 34 is covered with a seat skin 26.

  The seat cushion pad 34 of the present embodiment includes a front hard pad 36 as a hard portion disposed on the front side of the seat, a rear hard pad 39 disposed on the rear side of the seat, and an electric field responsiveness as a hardness changing portion. An ionized gel member 38 (hereinafter, referred to as “ionized gel member 38” as appropriate) is configured.

  Like the hard pad 22 of the first embodiment, the front side hard pad 36 constitutes the seat front side of the seat cushion pad 34, and is slightly forward of the seat cushion pad 34 in the seat front and rear direction. It is provided up to the offset position.

  The rear hard pad 39 is formed of the same member as the front hard pad 36 and constitutes the seat rear side of the seat cushion pad 34. And the back side hard pad 39 of this embodiment is arrange | positioned in the position which can support the waist | hip | lumbar part of the passenger | crew P who seated by the standard seating attitude | position defined by the collision test method from the seat back side.

  An ionized gel member 38 is disposed between the front hard pad 36 and the rear hard pad 39. The ionized gel member 38 is formed by filling an electric field-responsive ionized gel in a gel cover (not shown). And this electric field responsive ionization gel is a material which can change intensity | strength (hardness) by applying a voltage or changing an applied voltage.

  A voltage control unit 28 for applying a voltage to the electric field responsive ionized gel is electrically connected to the ionized gel member 38. The voltage control unit 28 applies a voltage to the electric field responsive ionization gel of the ionization gel member 38 when the collision of the occupant P inertially moving to the front side of the seat is detected or detected, or the electric field responsive ionization. The voltage applied to the gel is changed. As a result, the ionized gel member 38 is softer than the front hard pad 36.

  Here, the boundary portion between the front side hard pad 36 and the ionized gel member 38 is inclined toward the front side of the seat as it goes from the upper side of the seat to the lower side of the seat as seen from the seat width direction. Specifically, the rear surface 36A of the front hard pad 36 facing the rear side of the seat is inclined toward the front side of the seat as it goes from the upper side of the seat to the lower side of the seat as seen from the seat width direction.

  On the other hand, the boundary portion between the rear side hard pad 39 and the ionized gel member 38 is inclined toward the rear side of the seat as it goes from the upper side of the seat to the lower side of the seat as seen from the seat width direction. Specifically, the front surface 40A facing the front side of the seat in the rear hard pad 39 is inclined toward the rear side of the seat as it goes from the upper side of the seat to the lower side of the seat as seen from the seat width direction.

(Function and effect)
Next, the operation and effect of this embodiment will be described.

  In the vehicle seat 30 according to the present embodiment, since the hardness of the ionized gel member 38 is equivalent to that of a general seat cushion pad in a state before the vehicle collides, it is indicated by a two-dot chain line in FIG. The sciatica S is located at the position.

  Further, the ionized gel member 38 is softened more than the front hard pad 36 at the time of prediction or detection of a collision in which the occupant P inertially moves to the front side of the seat, and the sciatic bone S of the occupant P sinks into the ionized gel member 38. Accordingly, when the sciatic bone S of the occupant P attempts to move inertially toward the front side of the seat, the movement of the sciatic S is stopped by the front hard pad 36, and the movement of the front side of the occupant P is suppressed.

  Furthermore, in the present embodiment, the boundary portion between the front hard pad 36 and the ionized gel member 38 is inclined toward the front side of the seat as it goes from the upper side of the seat to the lower side of the seat as seen from the seat width direction. Furthermore, the boundary portion of the rear side hard pad 39 with the ionized gel member 38 is inclined toward the rear side of the seat as it goes from the upper side of the seat to the lower side of the seat as seen from the seat width direction. Thereby, in addition to the movement of the passenger P on the front side of the seat, the pelvis can be prevented from rotating to the rear side of the seat. That is, in FIG. 4, by restraining the pelvis from rotating clockwise (the rear side of the seat), a restraining force by a lap belt (not shown) can be sufficiently applied, and the protection performance of the occupant P is improved. Can do. Other operations are the same as in the first embodiment.

  In the first embodiment and the second embodiment, the electric field responsive ionized gel member is adopted as the hardness changing portion. However, the present invention is not limited to this, and the hardness (strength) can be arbitrarily changed under predetermined conditions. If it is a member, you may employ | adopt another member. For example, an electroactive polymer or the like may be employed instead of the electric field responsive ionized gel.

<Third Embodiment>
Next, the vehicle seat 40 according to the third embodiment will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected about the structure similar to 1st Embodiment, and description is abbreviate | omitted suitably.

  As shown in FIG. 5, the vehicle seat 40 of the present embodiment has the same configuration as that of the first embodiment except for the seat cushion pad 44. That is, the seat cushion 42 includes a flat seat pan 18 that constitutes a part of the seat cushion frame. A seat cushion pad 44 is supported on the upper surface of the seat pan 18, and the outer surface of the seat cushion pad 44 is covered with a seat skin 26.

  The seat cushion pad 44 of the present embodiment includes a front hard pad 46 as a hard portion disposed on the front side of the seat, a rear hard pad 50 disposed on the rear side of the seat, and an actuator built-in portion as a hardness changing portion. 48.

  Like the hard pad 22 of the first embodiment, the front side hard pad 46 constitutes the seat front side of the seat cushion pad 44, and is slightly forward of the seat cushion pad 44 in the seat front and rear direction. It is provided up to the offset position.

  The rear hard pad 50 is formed of the same member as the front hard pad 46 and constitutes the seat rear side of the seat cushion pad 44. And the back side hard pad 50 of this embodiment is arrange | positioned in the position which can support the waist | hip | lumbar part of the passenger | crew P who seated by the standard seating attitude | position defined by the collision test method from the seat back side.

  An actuator built-in portion 48 is disposed between the front hard pad 46 and the rear hard pad 50. The actuator built-in portion 48 is formed of the same material continuously with the front hard pad 46 and the rear hard pad 50, and the actuator 52 is built in the actuator built-in portion 48. Here, in the present embodiment, as an example of the actuator 52, a thin line-shaped biometal (registered trademark) that expands and contracts when an electric current flows is used. In addition, three actuators 52 are built in the actuator built-in portion 48 at intervals in the front-rear direction of the seat, and each of the actuators 52 extends in the seat width direction as a longitudinal direction.

  Each of the three actuators 52 is electrically connected to a voltage control unit 28 for applying a voltage to the actuators 52 and causing a current to flow. In a normal state, the current is supplied from the voltage control unit 28 to the actuator 52, so that the actuator 52 is contracted to be in a tension state, and the actuator built-in portion 48 is made as hard as a normal seat cushion pad. .

  On the other hand, the application of voltage to the actuator 52 is stopped when a collision in which the occupant P inertially moves to the front side of the seat is predicted or detected. As a result, as shown in FIG. 6, the actuator 52 is extended and bent toward the lower side of the seat, and the actuator built-in portion 48 is softened more than the front hard pad 46.

  Here, as shown in FIG. 5, the boundary portion 46A between the front side hard pad 46 and the actuator built-in portion 48 is inclined toward the front side of the seat as it goes from the upper side of the seat to the lower side of the seat when viewed from the seat width direction. On the other hand, a boundary portion 50A between the rear side hard pad 50 and the actuator built-in portion 48 is inclined toward the seat rear side as it goes from the seat upper side to the seat lower side as seen from the seat width direction.

  The boundary portion 46A indicates a boundary portion between the portion where the actuator built-in portion 48 deforms and the front hard pad 46 which does not deform when the actuator 52 expands and contracts. Further, the boundary portion 50A indicates a boundary portion between the portion where the actuator built-in portion 48 deforms and the rear hard pad 50 which does not deform when the actuator 52 expands and contracts.

(Function and effect)
Next, the operation and effect of this embodiment will be described.

  In the vehicle seat 40 according to the present embodiment, the hardness of the actuator built-in portion 48 is equivalent to that of a general seat cushion pad before the vehicle collides.

  Further, the actuator 52 is extended at the time of prediction or detection of a collision in which the occupant P inertially moves toward the front of the seat, so that the actuator built-in portion 48 is softened. As a result, as shown in FIG. 6, the sciatic bone S of the occupant P sinks into the actuator built-in portion 48. Accordingly, when the sciatic bone S of the occupant P attempts to move inertially toward the front side of the seat, the movement of the sciatic S is stopped by the front hard pad 46, and the movement of the front side of the occupant P is suppressed.

  Further, in the present embodiment, the boundary portion between the front hard pad 46 and the actuator built-in portion 48 is inclined toward the front side of the seat as it goes from the upper side of the seat to the lower side of the seat when viewed from the seat width direction. Furthermore, the boundary portion of the rear side hard pad 50 with the actuator built-in portion 48 is inclined toward the seat rear side as it goes from the seat upper side to the seat lower side as seen from the seat width direction. Thereby, in addition to suppressing movement of the occupant P on the front side of the seat, rotation of the pelvis to the rear side of the seat can be suppressed. That is, in FIG. 5, by restraining the pelvis from rotating in the clockwise direction (the rear side of the seat), a restraining force by a lap belt (not shown) can be sufficiently applied, and the protection performance of the occupant P is improved. Can do. Other operations are the same as in the first embodiment.

  The vehicle seats according to the first to third embodiments have been described above, but it is needless to say that the present invention can be implemented in various modes without departing from the gist of the present invention. For example, in FIG. 2, the sheet skin 26 located above the boundary portion between the hard pad 22 and the ionized gel member 24 may be folded inward to form the extra length portion. As a result, when the ionized gel member 24 is softened and the sciatic bone S of the occupant P sinks into the ionized gel member 24, the extra length is extended by pulling the seat skin 26, and the hard pad 22 is deformed. Can be suppressed. That is, it is possible to effectively suppress the inertial movement of the occupant P on the front side of the seat.

  Moreover, in the said embodiment, although the voltage applied to the ionization gel members 24 and 38 was changed at the time of normal driving | running | working and at the time of a collision, the structure which softens the ionization gel members 24 and 38 was demonstrated, In addition to this, The hardness of the ionized gel members 24 and 38 may be changed even during normal traveling. That is, the voltage applied to the ionized gel members 24 and 38 may be changed according to the body shape of the occupant P and the desired riding comfort.

DESCRIPTION OF SYMBOLS 10 Vehicle seat 12 Seat cushion 14 Seat back 20 Seat cushion pad 22 Hard pad (hard part)
22A Rear surface (boundary part)
24 Electric field responsive ionized gel member (hardness change part)
30 Vehicle Seat 32 Seat Cushion 34 Seat Cushion Pad 36 Hard Pad (Hard Part)
38 Electric field responsive ionized gel member (hardness change part)
40 Vehicle Seat 42 Seat Cushion 44 Seat Cushion Pad 46 Hard Pad (Hard Part)
48 Actuator built-in part (hardness change part)
B Buttocks D Thigh P Crew S Sciatica

Claims (1)

The occupant's thigh and buttocks can be supported, the hard part positioned on the front side of the seat, and the scapula of the occupant are supported on the rear side of the seat with respect to the hard part, and the occupant moves inertially on the front side of the seat A seat cushion including a seat cushion pad including a hardness change portion softened from the hard portion at the time of prediction or detection of a collision;
A seat back connected to an end of the seat cushion on the seat rear side; and
Have
A vehicle seat in which a boundary portion between the hard portion and the hardness changing portion is inclined toward the front side of the seat as it goes from the upper side of the seat to the lower side of the seat as seen from the seat width direction.