JP2019172225A - Vehicle seat - Google Patents

Abstract

To provide a vehicle seat capable of preventing occurrence of a submarine phenomenon by a simple configuration.SOLUTION: In an objective vehicle seat, a seat rear side portion of a cushion spring 30 is connected to a cushion frame 26, and the fuse parts 48, 50 are provided adjacently to an inserted part 46 being a connection part of the cushion frame 26 and cushion spring 30. The vehicle seat is configured so that the fuse parts 48, 50 are plastically deformed when a load to a seat front side having magnitude of a prescribed value or more acts on the cushion spring 30 and thereby, the connection state of the cushion spring 30 and cushion frame 26 by the inserted part 46 is released.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle seat.

  The following Patent Document 1 discloses an invention related to a vehicle seat. In this vehicle seat, the leading end portion of the tensioned elastomer sheet that supports the seat pad with respect to the seat frame is supported by the lock device. And in the prior art described in the following Patent Document 1, the tension state of the elastomer sheet is released by operating the lock device at the time of a vehicle collision or the like. For this reason, at the time of a vehicle collision or the like, the occupant's buttocks can be instantaneously displaced together with a part of the cushion pad to the seat lower side. As a result, it is possible to suppress the occurrence of a so-called submarine phenomenon, a phenomenon in which a gap is generated between the occupant and the seat belt and the occupant slides along the cushion pad due to inertial force during a vehicle collision or the like.

Japanese Patent Laid-Open No. 2004-237819

  However, in the prior art described in Patent Document 1, the lock device is configured to include an inflator, a piston, and a cylinder, and the configuration is complicated, so that the occurrence of the submarine phenomenon is suppressed with a simple configuration. There is room for improvement in terms of perspective.

  In view of the above facts, an object of the present invention is to obtain a vehicle seat that can suppress the occurrence of a submarine phenomenon with a simple configuration.

  A vehicle seat according to a first aspect of the present invention includes a seat cushion pad capable of supporting the thigh and buttocks of a seated occupant, and the seat cushion pad disposed on the seat lower side of the seat cushion pad. The seat rear frame portion is provided adjacent to the support portion connected to the seat cushion frame and the connection portion between the seat cushion frame and the support portion. The fuse is plastically deformed when a load on the front side of the seat larger than a predetermined value is applied to the support portion, and the connection state between the support portion and the seat cushion frame by the connection portion can be released. Part.

  According to the first aspect of the present invention, the thigh and buttocks of the seated occupant are supported by the seat cushion pad, and the seat cushion pad is disposed on the seat lower side of the seat cushion pad. The support portion supports the seat cushion frame.

  By the way, when a collision load or the like is input to the vehicle, a moment around the seat belt that restrains the occupant acts on the occupant, and the occupant's buttocks sink into the seat cushion pad, thereby restraining the occupant by the seat belt. The power may be weakened. As a result, it is conceivable that a phenomenon in which the occupant slides along the seat cushion pad due to inertial force, a so-called submarine phenomenon occurs.

  Here, in the present invention, the seat rear side portion of the support portion is connected to the seat cushion frame, and the fuse portion is provided adjacent to the connection portion between the seat cushion frame and the support portion. When a load to the front side of the seat having a magnitude greater than or equal to a predetermined value acts on the support portion, the fuse portion is plastically deformed, and the connection state between the support portion and the seat cushion frame by the connection portion is released. As a result, the support state of the seat cushion pad support portion is released, and the occupant's buttocks are displaced downward in the seat.

  For this reason, the moment about the seat belt acting on the occupant due to the input of a collision load or the like to the vehicle is absorbed by the plastic deformation of the fuse portion and the displacement of the occupant. And the relative displacement of a passenger | crew and a seat cushion pad can be suppressed because the support part which supports a seat cushion pad displaces with a passenger | crew. As a result, in the present invention, it is possible to prevent the occupant from sliding along the seat cushion pad even when a collision load or the like is input to the vehicle.

  As described above, the vehicle seat according to the first aspect of the present invention has an excellent effect that the occurrence of the submarine phenomenon can be suppressed with a simple configuration.

FIG. 5 is an exploded perspective view (enlarged view of a portion surrounded by a two-dot chain line X in FIG. 4) schematically showing a configuration of a connecting portion between a cushion spring and a seat frame in the vehicle seat according to the first embodiment. It is an enlarged plan view (two direction arrow line view of Drawing 1) showing composition of a fuse part provided in a vehicular seat concerning a 1st embodiment, and its peripheral part. It is a side view which shows typically the state where the crew member sat down on the vehicular seat concerning a 1st embodiment. It is a perspective view showing typically a schematic structure of a vehicular seat concerning a 1st embodiment. It is a perspective view showing typically composition of a cushion pan and seat cushion frame of a vehicular seat concerning a 2nd embodiment. It is a disassembled perspective view (enlarged view of a portion surrounded by a two-dot chain line Y in FIG. 5) schematically showing a configuration of a connecting portion between a cushion pan and a seat cushion frame in a vehicle seat according to a second embodiment. It is a disassembled perspective view (disassembled perspective view corresponding to FIG. 6) which shows typically the structure of the connection part of the cushion pan and seat cushion frame in the vehicle seat which concerns on 3rd Embodiment.

<First Embodiment>
Hereinafter, 1st Embodiment of the vehicle seat which concerns on this invention is described using FIGS. 1-4. In addition, the arrow FR, arrow UP, and arrow RH that are appropriately shown in the drawings respectively indicate the forward direction, the upward direction, and the right direction of the “vehicle seat 10” (hereinafter referred to as the seat 10) according to the present embodiment. ing. In the present embodiment, the front direction, the upper direction, and the right direction of the seat 10 are the same as the front direction, the upper direction, and the right direction of the vehicle on which the seat 10 is mounted. In this embodiment, as an example, the seat 10 is a vehicle seat for a passenger seat, but the seat 10 may be a vehicle seat for a driver seat.

  As shown in FIGS. 3 and 4, the seat 10 includes a seat cushion 18 that supports the thigh 14 and the heel 16 of the occupant 12, a seat back 22 that supports the back 20 of the occupant 12, and an illustration of the occupant 12. And a headrest 24 that supports the non-head.

  The seat back 22 is supported by an end of the seat cushion 18 on the rear side of the seat so as to be tiltable, and a headrest 24 is supported by the end of the seat back 22 on the upper side of the seat so as to be movable up and down.

  On the other hand, the seat cushion 18 includes a steel “seat cushion frame 26 (hereinafter referred to as a cushion frame 26)”, a steel front panel 28, and a plurality of steel “cushion springs” as support portions. 30 ”and“ seat cushion pad 32 (hereinafter referred to as cushion pad 32) ”.

  The cushion frame 26 includes a pair of side frames 34, a front frame and a rear frame 36 (not shown). The side frames 34 each have a plate shape in which the plate thickness direction is the seat width direction and extends in the front-rear direction of the seat, and are arranged in a state spaced from each other in the seat width direction. Ends on the front side of the side frame 34 are connected by a front frame extending in the seat width direction, and ends on the rear side of the side frame 34 are connected by a rear frame 36.

  As shown in FIG. 1, the rear frame 36 includes a cylindrical main body 38 and a mounting bracket 40. Of these, the main body 38 has a longitudinal direction as a vehicle width direction. In addition to being arranged, both end portions thereof are joined to the side frame 34 by joint portions (not shown) by welding or the like.

  On the other hand, the mounting bracket 40 includes a semi-cylindrical joining plate portion 40A extending in the seat width direction, and a rectangular plate extending from the joining plate portion 40A to the front side of the seat and extending in the seat width direction when viewed from the seat vertical direction. It is comprised including the extended board part 40B made into the shape. The joining plate portion 40A is joined to the main body portion 38 by welding or the like in a state where the main body portion 38 is covered from the upper side of the seat, and the extension plate portion 40B has a cushion as described later. A spring 30 is attached. The cushion frame 26 is supported by a seat slide rail (not shown) arranged on the seat lower side of the cushion frame 26 via four arm portions 42.

  The front panel 28 includes a top plate portion 28A and a pair of guide portions 28B. The top plate portion 28A has a substantially rectangular plate shape in which the plate thickness direction is the sheet vertical direction and the sheet width direction is the longitudinal direction when viewed from the sheet vertical direction. And the guide part 28B is each extended from the sheet | seat rear side part in the sheet | seat width direction both ends of the top plate part 28A to the sheet | seat rear side.

  The guide portion 28B has a U-shape in which the cross-sectional shape viewed from the front-rear direction of the seat is open to the lower side of the seat, and the front portion of the side frame 34 at the peripheral portion on the upper side of the seat from the upper side of the seat. It is locked. The front panel 28 is fixed to the side frame 34 by a fixing member (not shown).

  Two cushion springs 30 are arranged in the seat width direction, and are respectively spanned between the front panel 28 and the mounting bracket 40. The cushion spring 30 includes a pair of elastic deformation portions 30A extending in the front-rear direction of the seat and a fixing portion 30B that connects the elastic deformation portions 30A to each other on the front side of the seat. It is configured to be bent into a U shape opened to the rear side of the seat as viewed.

  More specifically, the seat front side portion and the seat rear side portion of the elastic deformation portion 30A extend linearly in the seat front-rear direction. In addition, the main part of the elastically deforming portion 30A is alternately a portion bent in a U shape that protrudes on one side in the vehicle width direction and a portion bent in a U shape that protrudes on the other side in the vehicle width direction. It is provided and configured. The elastic deformation portion 30A configured as described above is easily elastically deformed (bending deformation) with respect to the load in the vertical direction of the seat, and is not easily elastically deformed with respect to the load in the longitudinal direction. ing.

  On the other hand, the fixed portion 30B extends linearly in the seat width direction, and is joined to the surface above the seat in the top plate portion 28A of the front panel 28 by a joining portion 44 by welding or the like. As shown also in FIG. 1, hook portions 30C are provided at the end of the cushion spring 30 on the rear side of the seat so as to be continuous with the elastically deformable portions 30A. It is curved in a circumferential shape when viewed from the side. The hook portion 30C is used to connect the cushion spring 30 and the mounting bracket 40 as will be described later.

  The cushion pad 32 is made of an elastic body that can be compressed and deformed by applying a load such as urethane foam, and the surface thereof is covered with a skin material (not shown). The cushion pad 32 is disposed above the seat of the front panel 28 and the cushion spring 30 and is supported by the cushion frame 26 with these. The upper surface portion 32A of the cushion pad 32 constitutes a seating surface of the seat cushion 18, and the upper surface portion 32A is gently inclined from the upper front side of the seat toward the lower rear side of the seat.

  Here, in this embodiment, as shown in FIG. 1, the “insertion portion 46” as a connecting portion and the “fuse portion 48, which is adjacent to the insertion portion 46, are connected to the extension plate portion 40 </ b> B of the mounting bracket 40. The feature is that "50" is provided. Hereinafter, the configuration of the insertion part 46, the fuse parts 48 and 50, and their peripheral parts, which are the main parts of the present embodiment, will be described in detail.

  As shown in FIG. 2, the inserted portion 46 can be inserted through a shaft portion 52A of a bolt 52 (fastening member) used for attaching the hook portion 30C of the cushion spring 30, and the peripheral portion thereof is a seat. A part of the front side is an open circle. In addition, a slit portion 54 is provided on the front side of the inserted portion 46 so as to extend in the front-rear direction of the seat continuously with the inserted portion 46. The slit portion 54 has a length W in the sheet width direction that is the same as the diameter D of the insertion portion 46. Note that four inserted portions 46 and slit portions 54 are arranged in the seat width direction (the same number as the number of hook portions 30C of the cushion spring 30).

  On the other hand, the fuse portions 48 and 50 are provided as a pair in the sheet width direction at the boundary portion between the inserted portion 46 and the slit portion 54 and constitute a part of the peripheral portion of the inserted portion 46. Yes. The fuse portion 48 on one side in the sheet width direction has a substantially triangular shape that is reduced in width from one side in the sheet width direction toward the other side in the sheet width direction when viewed from the sheet vertical direction. On the other hand, the fuse portion 50 on the other side in the sheet width direction has a substantially triangular shape that is reduced in width from the other side in the sheet width direction toward the one side in the sheet width direction when viewed from the sheet vertical direction.

  The cushion spring 30 is configured such that the nut 56 is fastened from the lower side of the seat to the shaft portion 52A in a state where the shaft portion 52A of the bolt 52 is inserted through the hook portion 30C and the inserted portion 46, thereby the cushion frame 26. It is connected with.

  In the seat 10 configured as described above, when a load on the front side of the seat of a predetermined value or more acts on the cushion spring 30, the fuse portions 48 and 50 are plastically deformed, and the cushion spring 30, the cushion frame 26, The connected state by the inserted portion 46 is released.

  Specifically, when a load on the front side of the seat of a predetermined value or more acts on the shaft portion 52A of the bolt 52 via the hook portion 30C of the cushion spring 30, the fuse portions 48 and 50 are applied to the fuse portions 48 and 50 via the shaft portion 52A. The load acts so that the fuse portions 48 and 50 are plastically deformed. In this state, the insertion portion 46 is integrated with the slit portion 54, and the bolt 52, the nut 56, and the hook portion 30 </ b> C are guided by the shaft portion 52 </ b> A of the bolt 52 through the slit portion 54. Slide to move to.

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

  In the present embodiment, as shown in FIGS. 3 and 4, the thigh 14 and the heel 16 of the seated occupant 12 are supported by the cushion pad 32. The cushion pad 32 is supported to the cushion frame 26 by a cushion spring 30 disposed on the lower side of the seat of the cushion pad 32.

  Incidentally, as shown in FIG. 3, when the occupant 12 is seated on the seat 10, the lap belt 58 of the three-point seat belt that restrains the occupant 12 is the pelvis 60 (sitting state) of the occupant 12 in the vehicle side view. Is located in the vicinity of the center of gravity position G) of the occupant 12. Depending on the seating state of the occupant 12 and the like, it is conceivable that the center-of-gravity position G is located on the seat lower side of the lap belt 58 in a side view of the vehicle.

  In such a state, when a collision load or the like is input to the vehicle, a moment around the lap belt 58 (seat belt) acts on the occupant 12, and the heel portion 16 of the occupant 12 sinks to the cushion pad 32. It is conceivable that the restraining force of the occupant 12 by the lap belt 58 is weakened. As a result, a phenomenon that the occupant 12 slides along the cushion pad 32 due to inertial force, a so-called submarine phenomenon may occur.

  Here, in the present embodiment, as shown in FIG. 1, the seat rear side portion of the cushion spring 30 is coupled to the cushion frame 26, and is a cover portion that is a coupling portion between the cushion frame 26 and the cushion spring 30. Fuse portions 48 and 50 are provided adjacent to the insertion portion 46. When the load on the front side of the seat larger than a predetermined value is applied to the cushion spring 30, the fuse portions 48 and 50 are plastically deformed, and the connection state between the cushion spring 30 and the cushion frame 26 by the inserted portion 46 is released. Is done. As a result, the support state of the cushion pad 32 by the cushion spring 30 is released, and the heel portion 16 of the occupant 12 is displaced to the seat lower side.

  For this reason, the moment centering on the lap belt 58 acting on the occupant 12 due to the input of a collision load or the like to the vehicle is absorbed by the plastic deformation of the fuse portions 48 and 50 and the displacement of the occupant 12. Moreover, the relative displacement between the occupant 12 and the cushion pad 32 can be suppressed by the displacement of the cushion spring 30 that supports the cushion pad 32 together with the occupant 12. As a result, in the present embodiment, the occupant 12 can be prevented from slipping along the cushion pad 32 even when a collision load or the like is input to the vehicle. Therefore, in this embodiment, generation | occurrence | production of a submarine phenomenon can be suppressed with a simple structure.

  In the present embodiment, the bolt 52, the nut 56, and the hook portion 30C slide along the slit portion 54 toward the front of the seat in a state where the fuse portions 48 and 50 are plastically deformed by an input of a collision load or the like to the vehicle. To do. For this reason, the tension state of the cushion spring 30 is relieved, and the portion of the cushion pad 32 on the seat rear side can be moved to the seat lower side. Therefore, in this embodiment, the restraint performance around the waist of the occupant 12 can be ensured.

<Second Embodiment>
Hereinafter, a second embodiment of the vehicle seat according to the present invention will be described with reference to FIGS. 5 and 6. In addition, the same number is attached | subjected about the same component as 1st Embodiment mentioned above, and the description is abbreviate | omitted.

  The “vehicle seat 70” according to the present embodiment does not include the cushion spring 30, and the seat rear side portion of the “cushion pan 72” as the support portion is connected to the cushion frame 26 using the stepped bolt 74. It is characterized in that it is.

  Specifically, the cushion pan 72 includes a front panel portion 72A corresponding to the front panel 28 and a placement plate portion 72B. Similarly to the front panel 28, the front panel portion 72A includes a top plate portion 72A1 and a pair of guide portions 72A2, and the mounting plate portion 72B is provided on the lower rear side of the seat from the top plate portion 72A1. Has been extended.

  The placement plate portion 72B has a rectangular plate shape extending in the seat width direction and the seat front-rear direction when viewed from the seat vertical direction. A plurality of inserted portions 76 through which the shaft portion 74A of the stepped bolt 74 can be inserted at a position overlapping the inserted portion 46 when viewed from the seat vertical direction at the end portion on the seat rear side of the mounting plate portion 72B. Is formed. The inserted portion 76 has a circular shape when viewed from the vertical direction of the seat, and its diameter is set to be smaller than the outer diameter of the stepped portion 74B of the stepped bolt 74.

  In the present embodiment, the outer diameter of the stepped portion 74B of the stepped bolt 74 and the diameter D of the inserted portion 46 are set to be approximately the same, and the thickness of the stepped portion 74B is the extension of the mounting bracket 40. It is set to the same level as the thickness of the plate portion 40B. A nut 56 is fastened to the shaft portion 74A of the stepped bolt 74 from the upper side of the seat in a state where the shaft portion 74A is inserted into the inserted portions 46 and 76 from the lower side of the seat. Further, in a state where the nut 56 is fastened to the shaft portion 74A, the stepped portion 74B is housed inside the inserted portion 46, and the surface of the stepped portion 74B on the upper side of the seat is above the seat of the extending plate portion 40B. It is in the state located on the same plane as the side surface. Note that the same plane includes a configuration in which the sheet upper side surface of the stepped portion 74B is positioned slightly above the sheet with respect to the sheet upper side surface of the extension plate portion 40B.

  According to such a configuration, when the fuse portions 48 and 50 are plastically deformed by an input of a collision load or the like to the vehicle, the step portion 74B of the stepped bolt 74 is guided by the slit portion 54, whereby the cushion pan 72, The stepped bolt 74 and the nut 56 slide to the front side of the seat. For this reason, in this embodiment, except the effect | action and effect by the cushion spring 30, there exists the effect | action and effect similar to 1st Embodiment mentioned above.

  In the present embodiment, the stepped bolt 74 and the nut 56 are fastened in a state where the stepped portion 74B of the stepped bolt 74 is housed inside the inserted portion 46. For this reason, it can suppress that the axial force of the stepped bolt 74 acts on the extension board part 40B via the head 74C of the stepped bolt 74. As a result, the load on the front side of the seat acting on the cushion pan 72 can be efficiently transmitted to the fuse portions 48 and 50 as compared with the configuration in which the axial force of the fastening member acts on the extending plate portion 40B.

<Third Embodiment>
Hereinafter, a third embodiment of the vehicle seat according to the present invention will be described with reference to FIG. Note that the same components as those in the second embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  The “vehicle seat 80” according to the present embodiment has basically the same configuration as that of the second embodiment described above, but the inserted portion 46, the fuse portions 48 and 50, the slit portion 54, and the inserted portion. The positional relationship of 76 is different from that of the second embodiment described above.

  Specifically, the insertion portion 46, the fuse portions 48 and 50, and the slit portion 54 are provided at the end portion on the seat rear side in the placement plate portion 72 </ b> B of the cushion pan 72. In the present embodiment, the inserted portion 46, the fuse portions 48 and 50, and the slit portion 54 are arranged in this order from the vehicle front side. On the other hand, the insertion part 76 is provided in the extended plate part 40 </ b> B of the mounting bracket 40.

  A nut 56 is fastened to the shaft portion 74A of the stepped bolt 74 from the lower side of the seat in a state where the shaft portion 74A is inserted into the inserted portions 46 and 76 from the upper side of the seat. Further, in a state where the nut 56 is fastened to the shaft portion 74A, the stepped portion 74B is housed inside the inserted portion 46, and the surface of the stepped portion 74B on the lower side of the sheet is below the seat of the placement plate portion 72B. It is in the state located on the same plane as the side surface.

  According to such a configuration, when the fuse portions 48 and 50 are plastically deformed by an input of a collision load or the like to the vehicle, the slit portion 54 is guided by the step portion 74B of the stepped bolt 74, whereby the cushion pan 72 is Slide to the front side of the seat. Further, it is possible to suppress the axial force of the stepped bolt 74 from acting on the mounting plate portion 72B via the head portion 74C of the stepped bolt 74. For this reason, in this embodiment, there exists an effect | action and effect similar to 2nd Embodiment mentioned above fundamentally.

  Further, in the present embodiment, since the fuse portions 48 and 50 are provided in the cushion pan 72, compared to the configuration in which the fuse portions 48 and 50 are provided in the component parts of the cushion frame 26, the vehicle seat 80 is provided. The number of parts that need to be replaced at the time of restoration can be reduced.

  In each of the above-described embodiments, the moment acting on the occupant 12 is absorbed by the plastic deformation of the fuse portions 48 and 50, but is not limited thereto. For example, in the configuration as in the first embodiment described above, the hook portion 30C and the nut 56 of the cushion spring 30 are joined to the rear frame 36 by a welded portion such as TIG welding without providing the fuse portions 48 and 50, You may use a welding part as a fuse part. Specifically, the welded portion is configured to be broken (plastically deformed) when a load on the front side of the seat having a size equal to or greater than a predetermined value is applied to absorb the moment acting on the occupant 12. Also good.

  The vehicle seats 10, 70, 80 described above can also be mounted on a vehicle capable of automatic driving, and the orientation of the vehicle seats 10, 70, 80 mounted on the vehicle is as described above. Not limited to this, it may be changed arbitrarily.

10 Vehicle Seat 26 Seat Cushion Frame 30 Cushion Spring (Support)
32 Seat cushion pad 46 Insertion part (connection part)
48 Fuse part 50 Fuse part 70 Vehicle seat 72 Cushion pan (support part)
80 Vehicle seat

Claims (1)

A seat cushion pad capable of supporting the thigh and buttocks of a seated occupant;
The seat cushion pad is disposed on the lower side of the seat so that the seat cushion pad can be supported with respect to the seat cushion frame, and the rear portion of the seat is connected to the seat cushion frame; and
It is provided adjacent to the connecting portion between the seat cushion frame and the support portion, and is plastically deformed when a load to the front side of the seat of a predetermined value or more acts on the supporting portion, and the connecting portion A fuse part capable of releasing the connection between the support part and the seat cushion frame;
A vehicle seat having: