JP2019048515A - Vehicular seat structure - Google Patents

Abstract

To provide a vehicular seat structure configured to suppress a submarine phenomenon at a collision of a vehicle from a front of a seat while securing an excellent getting on/off property with a simple structure.SOLUTION: When an occupant P is seated, a hip part 70 is positioned on a sealed liquid chamber 58 of a liquid sealing pack 46. The sealed liquid chamber 58 is gradually deformed by viscosity of liquid 60 to fill a gap in a storage part 44. By setting lowering amounts of an upper surface of the sealed liquid chamber 58 to be equivalent to lowering amounts of a conventional seat cushion pad, an excellent getting on/off property can be secured in a vehicular seat 10. While, at a front collision of a vehicle, by action of incompressibility and viscosity of the liquid 60, deformation resistance force F is generated in the liquid 60 in short time of 0.1 second or less such as a collision phenomenon, so that an external shape of the sealed liquid chamber 58 is nearly maintained in a seated state before the collision for short time within the collision phenomenon time. This can suppress backward rotation of the occupant P when viewed from a side of the pelvis of the occupant P and suppress the submarine phenomenon.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a seat structure for a vehicle.

  Conventionally, in a general vehicle seat, since a high degree of comfort is important, a thick seat cushion pad made of highly compressible urethane foam is used. As a result, due to the inertial force acting on the occupant at the time of a frontal collision of the vehicle, the buttocks of the occupant compress the cushion pad in a diagonally downward direction in front of the vehicle. This causes the buttocks of the occupant to sink excessively into the cushion pad, and the pelvis upper part of the seated occupant moves backward in the vehicle and the pelvis lower moves forward in the vehicle in a vehicle side view (hereinafter referred to as "pelvis side view backward rotation") Produce As a result, there is a possibility that the lap belt of the three-point seat belt may come off the pelvis position (hereinafter referred to as "submarine phenomenon").

  On the other hand, by providing an elastomer sheet stretched under tension between a pair of rod-like frames below the buttocks support area of the seat cushion pad, the seat cushion is released by releasing the tension state of the elastomer sheet at the time of frontal collision of the vehicle. It has been proposed to suppress the submarine phenomenon by depressing the buttocks support region of the pad (see Patent Document 1).

  Similarly, the lower part of the buttocks support area of the seat cushion pad is supported by a plurality of pneumatic bags, and the buttocks support area of the seat cushion pad is depressed by discharging air of the pneumatic bag at the time of frontal collision of the vehicle. It has been proposed to suppress (see Patent Document 2).

Unexamined-Japanese-Patent No. 2004-237819 Unexamined-Japanese-Patent No. 2004-268692

  In the above-mentioned prior art, a drive mechanism or the like is required to lower the buttocks support area of the seat cushion downward at the time of a frontal collision of the vehicle, which complicates the structure of the vehicle seat structure.

  Conversely, it is also conceivable to provide a recess in the seat cushion in advance to suppress the pelvis side view backward rotation at the time of a frontal collision of the vehicle, but the occupant's buttocks excessively sink when the occupant is seated, impairing the passenger's getting on and off. Be

  In view of the above facts, the present invention ensures good getting on and off with a simple configuration, and at the time of a collision where a collision load is input to the vehicle from the front of the seat (hereinafter referred to as "at the time of a vehicle collision from the front of the seat") An object of the present invention is to provide a vehicle seat structure that suppresses the submarine phenomenon.

  The invention according to claim 1 is a liquid-sealed pack which is formed integrally with an enclosed liquid chamber which is disposed in a buttocks supporting area of a seat cushion and in which an incompressible liquid is enclosed and which is made of an elastic material; A top plate portion of a seat cushion frame having a size that accommodates a chamber and having a recess opened upward, and disposed between the liquid seal pack and the top plate portion, the recess in a plan view A seat cushion pad having a hole which penetrates up and down at a position corresponding to the seat cushion volume, and the volume of the storage portion formed by the hole and the recess is larger than the volume of the enclosed liquid chamber; A gap is formed in the housing portion so that the upper surface of the enclosed liquid chamber can be lowered when the seat is seated.

  According to this configuration, when the occupant is seated, the buttocks of the occupant are placed on the enclosed liquid chamber of the liquid seal pack. An incompressible liquid is enclosed in the enclosed liquid chamber, but a gap is formed in the recess of the top plate of the seat cushion frame in which the enclosed liquid chamber is accommodated, and the enclosed liquid is filled to fill the gap. The chamber is gradually deformed by the viscosity of the enclosed liquid. This causes the buttocks of the occupant to descend gradually, and the enclosed liquid chamber deforms along the buttocks shape. If the amount of descent of the upper surface of the enclosed liquid chamber due to the seating of the occupant is set equal to that of the conventional seat cushion, it is possible to improve the getting on / off of the vehicle seat.

  On the other hand, when the vehicle collides from the front of the seat, the buttocks of the seated occupant push the upper surface of the enclosed liquid chamber obliquely downward in the seat forward by the inertia force acting on the seated occupant. However, due to the incompressibility and viscosity of the liquid enclosed in the enclosed liquid chamber, in a short time of 0.1 seconds or less as in the collision phenomenon, the liquid is deformed to the enclosed liquid against the load input to the enclosed liquid chamber Resistance is generated. As a result, the outer shape of the enclosed liquid chamber is maintained substantially in the sitting state shape before the collision for a short time within the collision phenomenon time. Thereby, at the time of a vehicle collision from the front of the seat, the sinking behavior of the buttocks of the occupant with respect to the seat cushion is restricted, and the pelvic side view backward rotation is suppressed. That is, the submarine phenomenon is suppressed.

  Since the vehicle seat structure of the invention according to claim 1 is configured as described above, it is possible to suppress the submarine phenomenon at the time of a vehicle collision from the front of the seat while securing a good getting on / off property with a simple configuration.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic perspective view which shows the vehicle seat structure which concerns on one Embodiment. It is a schematic perspective view showing a seat frame of a vehicle seat structure concerning one embodiment. It is an exploded perspective view of a seat cushion of a vehicle seat structure concerning one embodiment. It is the AA line expanded sectional view of FIG. It is sectional drawing which shows the passenger | crew seating state in FIG. It is a principal part expanded sectional view which shows the time of front collision of the vehicle in FIG.

  A vehicle seat structure according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6. Moreover, each figure is schematic and the illustration having a low relevance to the present invention is omitted. In FIG. 1 to FIG. 6, the arrow FR indicates the front of the vehicle, the arrow W indicates the vehicle width direction, and the arrow UP indicates the upper side of the vehicle. Further, in the present embodiment, since the seat front, the seat width direction, and the seat upper direction substantially coincide with the vehicle front, the vehicle width direction, and the vehicle upper side, respectively, the vehicle forward, the vehicle width direction, and the vehicle upper side are unified and described. Do.

(Constitution)
As shown in FIG. 1, the vehicle seat 10 of the vehicle seat structure of a vehicle according to the present embodiment is provided on the front passenger seat side on the left side of the vehicle front seat in the cabin.

  As shown in FIG. 1, the vehicle seat 10 is disposed at the seat cushion 12 on which the occupant sits, the seat back 14 supporting the back of the occupant at the rear end of the seat cushion 12, and the upper end of the seat back 14. And a headrest 16 for supporting the head of the occupant.

  Inside the vehicle seat 10 (the seat cushion 12 and the seat back 14), as shown in FIG. 2, a seat cushion frame 20 and a seat axially supported by a reclining rod 24 described later at the rear end of the seat cushion frame 20 A back frame 22 is disposed.

  As shown in FIG. 2, the seat cushion frame (also referred to as “cushion pan”) 20 is provided between a pair of side frames 26 and 26 extending in the vehicle longitudinal direction at both ends in the vehicle width direction and the side frames 26 and 26. A top plate portion 28 (hereinafter referred to as a "top plate portion 28") of a seat cushion frame having a substantially rectangular shape in plan view and a rear frame bridged between the rear end portions of the side frames 26, 26 and the like. And 30.

  The top plate portion 28 is, as shown in FIGS. 2 to 4, a flat portion 32 having a substantially rectangular shape in a plan view and extending substantially in the horizontal direction of the vehicle, and a peripheral portion extending to the vehicle lower side from the periphery of the flat portion 32. 34 and a recess 36 having a rectangular shape in plan view at the center in the vehicle width direction on the vehicle rear side of the flat portion 32.

  As shown in FIG. 4, the rear end portion of the flat portion 32 is supported by the rear frame 30 by the peripheral portion 34 on the vehicle rear side of the top plate portion 28 being wound around the rear frame 30.

  Further, as shown in FIG. 3 and FIG. 4, a convex portion 38 protruding upward from the flat portion 32 is formed at the peripheral edge portion of the concave portion 36 in the top plate portion 28.

  As shown in FIG. 3, the seat cushion pad 40 disposed above the top plate 28 has a substantially rectangular shape in plan view similarly to the top plate 28, and is made of foamable urethane. In the seat cushion pad 40, a hole 42 penetrating in the vertical direction is formed at a position corresponding to the recess 36 of the top plate 28 in a plan view. The hole 42 is formed in the same shape (rectangle) in plan view as the recess 36.

  Therefore, as shown in FIG. 4, by placing the seat cushion pad 40 on the flat portion 32 of the top plate portion 28, the convex portion 38 formed on the peripheral portion of the concave portion 36 is inward of the hole portion 42. The seat cushion pad 40 is fitted and positioned on the top plate portion 28, and the recess 36 is opened upward through the hole 42. The space formed by the recess 36 and the hole 42 is referred to as a housing 44.

  As shown in FIG. 3, the liquid-sealed pack 46 covering the seat cushion pad 40 from the top has an upper surface 48 covering the upper surface of the seat cushion pad 40 and a front edge, a rear edge, a left edge and a right edge of the upper surface 48. It has the front surface part 50, the rear surface part 52, the left surface part 54, and the right surface part 56 which each covers.

  Further, as shown in FIGS. 3 and 4, when the liquid seal pack 46 is placed on the seat cushion pad 40, the liquid seal pack 46 corresponds to the hole 42 (the housing portion 44) of the seat cushion pad 40. In the lower position, the enclosed liquid chamber 58 is formed. The enclosed liquid chamber 58 is formed in a substantially rectangular shape in plan view, and the incompressible liquid 60 is enclosed therein. In addition, since the volume of the enclosed liquid chamber 58 is smaller than the volume of the accommodation part 44, when the enclosed liquid chamber 58 is accommodated in (the inside of) the accommodation part 44, the gap 62 is in the lower part of the accommodation part 44 (the recess 36). It is the structure formed.

  Furthermore, the liquid sealing pack 46 is integrally formed of an elastic body, for example, rubber, and can be deformed in the housing portion 44 while keeping the volume of the enclosed liquid chamber 58 in which the non-compressible liquid 60 is enclosed constant. And

  In addition, the amount of deformation (descent of the upper surface) of the seat cushion formed of only the urethane foam cushion pad without the enclosed liquid chamber 58 when the occupant is seated (descent of the upper surface) is approximately the same The volume (volume of the gap 62) of the housing portion 44 formed in the plate portion 28 and the seat cushion pad 40 is set.

  Further, a vertical wall 64 extending in the vehicle width direction is formed on the upper surface portion 48 constituting the enclosed liquid chamber 58. The vertical wall 64 suppresses movement of the liquid 60 enclosed in the enclosed liquid chamber 58 in the front-rear direction at the time of a frontal collision of the vehicle (adjusts the flow resistance).

(Action effect)
The operation and effect of the vehicle seat structure configured as described above will be described.
First, as shown in FIG. 5, when the occupant P is seated on the vehicle seat 10, the buttocks 70 of the occupant P are positioned above the enclosed liquid chamber 58 of the seat cushion 12 (liquid seal pack 46). In the enclosed liquid chamber 58, since the incompressible liquid 60 is enclosed, the volume does not change due to the load of the occupant P. However, since the gap 62 (see FIG. 4) is formed in the housing 44 (recess 36) in which the sealed liquid chamber 58 is housed, the sealed liquid chamber 58 is gradually filled with the viscosity of the liquid 60 to fill the gap 62. Transform into

  Here, since the volume (volume of the gap 62) of the housing portion 44 is set so that the lowering amount of the upper surface of the enclosed liquid chamber 58 is the same as the lowering amount of the upper surface of the seat cushion consisting only of the urethane foam pad, Good getting on / off and sitting comfort are secured to the vehicle seat 10.

  In addition, since the liquid sealing pack 46 including the sealing liquid chamber 58 is integrally formed of an elastic body, deformation of the sealing liquid chamber 58 is permitted when the upper surface portion 48 or the like of the liquid sealing pack 46 extends.

  On the other hand, when the occupant P leaves the seat cushion 12, as shown in FIG. 4, the enclosed liquid chamber 58 returns to the initial position in the housing portion 44 by the elasticity of the liquid sealing pack 46, and the inside of the housing portion 44 A gap 62 is formed in the Therefore, every time the occupant P is seated, good getting on and off and comfort are ensured.

  By the way, as shown in FIG. 5, when the occupant P is seated on the seat cushion 12, the lap belt 72 of the three-point seat belt passes (the center of gravity G of the pelvis 74 of the occupant P in a vehicle side view). Is set as.

  In the event of a frontal collision of the vehicle, an inertial force to the front of the vehicle acts on the occupant P, and the buttocks 70 (pelvis 74) of the occupant P presses the seat cushion 12 (enclosed liquid chamber 58) diagonally downward to the vehicle front .

  On the other hand, as in the collision phenomenon, within a short time of 0.1 seconds or less, the incompressibility and viscosity of the liquid 60 act against the input load acting on the enclosed liquid chamber 58 from the flange 70 to the enclosed liquid chamber 58 (liquid The deformation resistance F acts on the buttocks 70 of the occupant P from 60) (see FIG. 6). As a result, as shown in FIG. 5, the external shape of the enclosed liquid chamber 58 is maintained substantially the same as the seating state of the occupant P before the frontal collision of the vehicle.

  For this reason, the sinking of the buttocks 70 with respect to the seat cushion 12 due to a frontal collision of the vehicle in the forward and downward direction of the vehicle is prevented, and the pelvic side view backward rotation accompanying this is prevented or suppressed.

  Further, as shown in FIG. 6, the action line L of the deformation resistance force F is located below the center of gravity G of the pelvis 74 in the vehicle side view. Therefore, a rotational moment M1 that causes the pelvis 74 to rotate the upper portion of the pelvis forward of the vehicle acts on the pelvis 74 by the deformation resistance F.

  On the other hand, when the seat cushion pad 40 is formed of the urethane foam pad over the entire surface (without the hole 42 and the enclosed liquid chamber 58), the sinking of the collar 70 of the occupant P with respect to the seat cushion 12 A rotational moment M2 that causes the pelvis 74 to rotate rearward in a side view of the vehicle acts by the insertion.

  However, in the vehicle seat 10, the forward rotational moment M1 acts on the pelvis 74 by the deformation resistance force F from the enclosed liquid chamber 58, thereby preventing or suppressing the pelvis side view backward rotation at the time of a frontal collision of the vehicle. it can.

  As a result, at the time of a frontal collision of the vehicle, the lap belt 72 is separated from (the center of gravity G of the pelvis 74) by the pelvis side view backward rotation, and the lap belt 72 compresses the relatively soft abdomen as compared with the pelvis 74. It can be prevented or suppressed. That is, the submarine phenomenon can be prevented or suppressed.

  In particular, the vehicle seat structure of the present embodiment is suitable when there is no instrument panel (hereinafter abbreviated as "instrument panel") on the vehicle front side of the vehicle seat, such as an automatically driven vehicle. This is because the reaction force from the instrument panel through the knees is not input to the occupant P at the time of a frontal collision of the vehicle, so that it is difficult for the occupant P to stop moving the waist of the vehicle forward. As a result, it is considered that the angle between the lap belt and the pelvis in the side view of the vehicle and the horizontal direction of the lap belt is shallow and the tension of the lap belt further promotes the pelvis side view backward rotation. That is, it is considered that the possibility of the pelvic side view backward rotation and the submarine phenomenon occurring at the time of a frontal collision is further increased.

  Even in such a vehicle, the pelvic side view back rotation and the pelvic side view backward rotation are ensured with a simple structure of opening the gap 62 in the housing portion 44 of the seat cushion 12 and housing the enclosed liquid chamber 58. It is believed that the submarine phenomenon can be prevented or suppressed.

  Thus, in the vehicle seat 10 of the vehicle seat structure, the enclosed liquid chamber 58 in which the incompressible liquid 60 is enclosed is provided in the area of the seat cushion 12 where the collar 70 of the occupant P is disposed. The volume of the accommodation portion 44 in which 58 is accommodated is set larger by the gap 62 than the volume of the enclosed liquid chamber 58, and the amount of deformation (the amount of descent of the upper surface) of the enclosed liquid chamber 58 when the occupant P is seated It is the same as when it was formed. As a result, the seat cushion 12 secures good getting on and off and comfort.

  Further, at the time of a frontal collision of the vehicle, the collar portion 70 of the occupant P presses the enclosed liquid chamber 58 obliquely downward in the forward direction of the vehicle, but the input is made by the incompressibility and viscosity of the liquid 60 within a short time such as a collision phenomenon. The deformation resistance force F acts on the heel portion 70 of the occupant P from the enclosed liquid chamber 58 in response to the load. At this time, the external shape of the enclosed liquid chamber 58 is substantially maintained, and the forward rotation moment M1 is applied to the pelvis 74 of the occupant P to prevent or suppress the pelvis side view backward rotation.

  That is, the submarine phenomenon at the time of the frontal collision can be suppressed while securing the getting on / off ability with a simple configuration without using the drive mechanism etc. at the time of the frontal collision of the vehicle.

[Others]
In the present embodiment, although the vehicle seat 10 on the left side (front passenger seat side) of the vehicle front seat is described, the vehicle seat 10 is similarly applied to a vehicle seat on the right side (driver seat side) of the vehicle front seat be able to. The present invention is also applicable to the seats other than the front row of the vehicle.

  Further, in the present embodiment, the gap 62 formed in the housing portion 44 (the concave portion 36) is located below the enclosed liquid chamber 58, but the present invention is not limited to this. For example, it may be formed in at least one of the front, rear, left, and right of the enclosed liquid chamber 58 in the housing portion 44. Even in this case, by deforming the enclosed liquid chamber 58 so as to fill the gap 62, the upper surface of the enclosed liquid chamber 58 can be lowered by a predetermined amount when the occupant P is seated.

  Furthermore, in the present embodiment, the frontal collision of the vehicle has been described, but the present invention is not limited to this. That is, the present invention can be applied to a vehicle seat directed to the rear of the vehicle or in the vehicle width direction, as in a vehicle seat of an autonomous driving vehicle. In this case, the same action can be exerted against a collision in which a collision load is input from the front of each vehicle seat.

10 Vehicle seat 12 Seat cushion 28 Seat cushion frame top plate 36 Recess 40 Seat cushion pad 42 Hole 46 Liquid sealing pack 58 Sealed liquid chamber 60 Liquid 62 Clearance

Claims (1)

A liquid-sealed pack made of an elastic material and integrally formed including an enclosed liquid chamber disposed in the buttocks supporting area of the seat cushion and in which the incompressible liquid is enclosed;
A top plate portion of a seat cushion frame having a size to receive the enclosed liquid chamber and having a recess opened upward;
A seat cushion pad disposed between the liquid-sealed pack and the top plate portion and having a hole portion vertically penetrating at a position corresponding to the concave portion in a plan view;
And the volume of the container formed by the hole and the recess is larger than the volume of the enclosed liquid chamber, and a gap is provided such that the upper surface of the enclosed liquid chamber can be lowered when an occupant is seated. The vehicle seat structure currently formed in the said accommodating part.