JP2016068720A - Cushion frame, vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cushion frame and a vehicle seat capable of obtaining a structure to which a belt retractor can be attached while preventing increase in mass.SOLUTION: Since a cushion frame 30 has a path (load path) through which a load inputted to a belt retractor 50 is transmitted to each member, the load can be shared by each member. Accordingly, it is possible to prevent a plate thickness of each member from becoming thick and mass of the cushion frame 30 from becoming increased. In this way, while preventing increase in mass, it is possible to obtain a structure to which the belt retractor 50 can be attached.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cushion frame and a vehicle seat.

  Patent Document 1 describes a vehicle seat to which a belt retractor is attached. A belt retractor is detachably attached to the lower portion of the cushion frame and substantially in the center in the front-rear direction.

JP 2014-129066 A

  Conventionally, the belt retractor has been attached to the lower portion of the cushion frame and to the substantially central portion in the front-rear direction. For this reason, since it is necessary to make rigidity high, the bracket unit used when attaching a belt retractor to a cushion frame can become a member with a heavy mass. Thereby, the mass of the whole cushion frame was heavy.

  The subject of this invention is obtaining the structure which can attach a belt retractor, after suppressing the increase in mass.

  A cushion frame according to claim 1 is a skeleton member that supports a seat cushion of a vehicle seat, and is disposed on both ends in the seat width direction, and a pair of side frames whose plate surfaces face the seat width direction, and the side A first cross member extending in the seat width direction at a rear side portion of the frame in the front-rear direction of the frame and spanned between the pair of side frames, and below the first cross member in the seat vertical direction A second cross member extending along the first cross member and spanned between the pair of side frames, and joined to the first cross member and the second cross member at the center in the seat width direction. A pair that is joined to the joining part, extends in the seat width direction, is joined to the side frame, and a belt retractor is attached. Comprising a bracket unit having a mounting bracket, and the.

  According to the said structure, the joining parts which a bracket unit has are joined to the 1st cross member and the 2nd cross member in the center side of the sheet | seat width direction. Further, the pair of mounting brackets included in the bracket unit are joined to the joining parts, extend in the seat width direction, and are joined to the side frames. And a belt retractor is attached to this attachment bracket.

  Thereby, since the load input to the mounting bracket is transmitted to each member, it is possible to obtain a configuration in which the belt retractor can be mounted while suppressing an increase in mass.

  The cushion frame according to claim 2 is the cushion frame according to claim 1, wherein the bracket unit is disposed on the rear side in the seat front-rear direction with respect to the first cross member and the second cross member, and the belt The retractor is attached to the first cross member and the second cross member side of the mounting bracket.

  According to the above configuration, the bracket unit is arranged on the rear side in the seat front-rear direction with respect to the first cross member and the second cross member, and the belt retractor is attached to the first cross member and the second cross member side of the mounting bracket. It is done.

  Thereby, since the belt retractor is disposed between the mounting bracket and the first cross member and the second cross member, the belt retractor can be protected from luggage or the like.

  A cushion frame according to a third aspect is the cushion frame according to the first or second aspect, wherein the joining parts are U-shaped when viewed from the upper side, and portions on both ends of the joining parts are the first parts, respectively. It is joined to the cross member and the second cross member.

  According to the above configuration, the joining parts are U-shaped when viewed from the upper side, and both end portions of the joining parts are joined to the first cross member and the second cross member, respectively.

  Thereby, since the load input to the joining part is transmitted to the first cross member and the second cross member via the both end portions of the joining part, the load input to the joining part is effectively transmitted. be able to.

  A vehicle seat according to a fourth aspect includes the cushion frame according to any one of the first to third aspects, and a back frame coupled to a rear side portion of the cushion frame in the seat front-rear direction. ing.

  According to the above configuration, since the vehicle seat includes the cushion frame according to any one of claims 1 to 3, the belt retractor is attached to the vehicle seat while suppressing an increase in mass. Possible configurations can be obtained.

  According to the present invention, it is possible to obtain a configuration in which a belt retractor can be attached while suppressing an increase in mass.

It is the perspective view which showed the cushion frame which concerns on embodiment of this invention. It is the perspective view which showed the cushion frame which concerns on embodiment of this invention. It is the perspective view which showed the cushion frame which concerns on embodiment of this invention. It is the perspective view which decomposed | disassembled some cushion frames which concern on embodiment of this invention. (A) (B) It is the side view and sectional view which showed the cushion frame which concerns on embodiment of this invention. (A) (B) It is the perspective view which showed the vehicle seat which concerns on embodiment of this invention. It is the perspective view which showed the vehicle seat which concerns on embodiment of this invention. 1 is an exploded perspective view showing a vehicle seat according to an embodiment of the present invention.

  An example of a cushion frame and a vehicle seat according to an embodiment of the present invention will be described with reference to FIGS. Note that an arrow UP shown in the drawing indicates an upward direction in the vertical direction (up and down direction of the seat), an arrow WI indicates a seat width direction, and an arrow FB direction indicates a front and rear direction of the seat.

(overall structure)
A vehicle seat 10 (hereinafter simply referred to as “seat 10”) is a seat used in a vehicle, as shown in FIGS. As shown in FIG. 8, the seat 10 is attached to the frame 12 as a support, a seat cushion 14 that is attached to the frame 12 and supports the buttocks of a seated occupant, and the seat 12. A back cushion 16 that supports the back and waist of the occupant, and a headrest 22 that is attached to the frame 12 and supports the head of the seated occupant.

  Furthermore, the seat 10 includes a cushion skin 18 that covers the seat cushion 14, a back skin 20 that covers the back cushion 16, and a pair of belt retractors 50.

[Frame 12]
The frame 12 includes a cushion frame 30 that supports the seat cushion 14 and a back frame 32 that supports the back cushion 16.

  Further, the rear end of the cushion frame 30 in the front-rear direction and the lower end of the back frame 32 in the vertical direction are connected to each other via a shaft member 36 provided in the reclining mechanism. The back frame 32 swings around the shaft member 36.

  The back frame 32 includes a pair of headrest holders 34 that support the headrest 22, and the headrest holders 34 are attached to a portion on the upper end side of the back frame 32, and two headrest holders 34 are arranged at intervals in the seat width direction. ing. The headrest holder 34 has a cylindrical shape extending in the vertical direction, and a portion on the end side of the stay member 44 provided in the headrest 22 is inserted therein. Details of the cushion frame 30 will be described later.

[Seat cushion 14 / Back cushion 16]
The seat cushion 14 is formed using urethane foam resin, and includes a pair of side support portions 40 that suppress a seated occupant from sliding in the seat width direction, and a main portion 42 disposed between the pair of side support portions 40. I have.

  The back cushion 16 is formed using urethane foam resin, and a main body disposed between a pair of side support portions (not shown) that suppresses the upper body of a seated occupant from sliding in the seat width direction and the pair of side support portions. Part (not shown).

(Main part)
Next, the cushion frame 30 and the like will be described.

  As shown in FIGS. 1 and 2, the cushion frame 30 is attached to the main frame 48 and a bracket unit 52 to which the belt retractor 50 (see FIG. 8) is attached. I have.

[Mainframe 48]
The main frame 48 is disposed on both ends in the seat width direction, and includes a pair of side frames 54 that are attached to the back frame 32 via a reclining mechanism (not shown), with the plate surfaces facing the seat width direction. .

  Further, the main frame 48 includes a cross member 60 having a cylindrical cross section that spans between the pair of side frames 54 at a portion on the front side of the side frame 54. Further, the main frame 48 includes a cross member 62 having a rectangular cross section that spans between the pair of side frames 54 on the lower side of the cross member 60. The cross members 60 and 62 are joined to the respective side frames 54 by welding or the like.

  Further, the main frame 48 includes a cross member 68 (an example of a first cross member) having a cylindrical cross section that spans between the pair of side frames 54 at a portion on the rear side of the side frame 54. Further, the main frame 48 includes a cross member 74 (an example of a second cross member) having a rectangular cross section that spans between the pair of side frames 54 below the cross member 68.

  Further, a plurality of S springs 64 are bridged between the cross member 60 and the cross member 68, and the front portion of these S springs 64 is locked to the cross member 60, and the rear side thereof is The portion is locked to the cross member 68. And these S springs 64 are supporting the seat cushion 14 (refer FIG. 8) from the downward side.

[Side frame 54]
As shown in FIGS. 4, 5 </ b> A and 5 </ b> B, the side frame 54 has an inner panel 56 disposed on the inner side (sheet center side) in the seat width direction, and the seat width with respect to the inner panel 56. And an outer panel 58 disposed on the outer side in the direction.

As an example, the inner panel 56 is formed using a cold-rolled high-tensile steel plate (SPFC590) having a plate thickness of 2.9 [mm] and a tensile strength of 590 [N / mm ² ] or more.

  A flange portion 56 </ b> A whose tip is directed to the outer panel 58 side is formed on the outer peripheral portion of the inner panel 56 except for a part thereof. Further, the inner panel 56 is formed with a circular through hole 56B through which the end of the cross member 68 passes and a rectangular through hole 56C through which the end of the cross member 74 passes.

As an example, the outer panel 58 is formed using a hot-rolled high-tensile steel plate (SPFH780) having a plate thickness of 1.6 [mm] and a tensile strength of 780 [N / mm ² ] or more.

  The outer panel 58 is formed with a flange portion 58 </ b> A except for a part thereof on the outer peripheral side of the outer panel 58 with the tip facing the inner panel 56 side. Further, the outer panel 58 includes a circular through hole 58B through which the end of the cross member 68 passes, a U-shaped cutout 58C through which the end of the cross member 74 passes, and a cross member 62 (see FIG. 1). A U-shaped cutout portion 58D through which passes is formed.

  Further, in a state where the inner panel 56 and the outer panel 58 are combined (ASSY state), the side frame 54 has a bag shape in which the inside is hollow as shown in FIG. And the inner panel 56 and the outer panel 58 are joined by welding etc. in the outer peripheral part.

[Cross member 68]
For example, the cross member 68 is formed using a carbon steel pipe for mechanical structure (STKM17A) having a plate thickness of 1.6 [mm] and a tensile strength of 550 [N / mm ² ] or more and a diameter of 25.4 [mm]. Has been.

  As shown in FIGS. 1 and 4, the portions on both ends of the cross member 68 pass through the through hole 56 </ b> B and the through hole 58 </ b> B, and are joined to the side frame 54 by welding or the like at this passing portion. Yes.

[Cross member 74]
As an example, the cross member 74 is a carbon steel pipe for mechanical structure (STKM590) having a plate thickness of 2.3 mm and a tensile strength of 590 N / mm ² or more and a cross section of 40 mm × 30 mm. ).

  As shown in FIGS. 1 and 4, the portions on both ends of the cross member 74 pass through the through hole 56 </ b> C and the notch 58 </ b> C, and are joined to the side frame 54 by welding or the like at this passing portion. ing.

[Bracket unit 52]
As shown in FIGS. 1 and 2, the bracket unit 52 includes a joining member 80 joined to the cross member 68 and the cross member 74 on the center side in the seat width direction. Further, the bracket unit 52 has a pair of proximal end portions attached (joined) to the joining part 80, and extends to the outside in the seat width direction, and a distal end portion attached to the side frame 54 (joined). A bracket 82 (an example of a mounting bracket) is provided.

[Joint parts 80]
As an example, the joining part 80 is formed using a hot-rolled steel plate (SPHC) having a thickness of 1.6 [mm].

  2 and 4, the joining part 80 has a U-shape with the front side opened as viewed from the upper side, and the portions on both ends of the joining part 80 are the cross member 68 and the cross, respectively. The member 74 is joined by welding or the like.

  Specifically, notches 80 </ b> A corresponding to the outer peripheral shape of the cross member 68 are formed on both ends of the joining part 80 and on the upper side. Further, notches 80B corresponding to the outer peripheral shape of the cross member 74 are formed on both ends of the joining part 80 and on the lower side thereof.

  The joining parts 80 are joined to the cross member 68 by welding or the like at a pair of notches 80A, and are joined to the cross member 74 by welding or the like at a pair of notches 80B. In a state in which the joining part 80 is joined to the cross member 68 and the cross member 74, as shown in FIG. 2, both end portions of the joining part 80 are sandwiched between the cross member 68 and the cross member 74. It has become.

[Bracket 82]
As shown in FIGS. 1 and 4, the pair of brackets 82 includes a bracket 84 disposed on the inner side in the seat width direction, and a bracket 86 disposed on the opposite side of the bracket 84 with the joining part 80 interposed therebetween. It has.

For example, the bracket 84 is formed using a hot-rolled high-tensile steel plate (SPFH590) having a plate thickness of 1.6 [mm] and a tensile strength of 590 [N / mm ² ] or more.

  The bracket 84 is U-shaped with the front side opened when viewed from above, and a flange portion 84A with a plate surface facing the front-rear direction of the seat projects on the joining part 80 side. The bracket 84 is joined to the joining part 80 by welding or the like at the flange portion 84A.

  The bracket 84 is formed with an extending wall 84B extending to the side frame 54 on the side opposite to the flange portion 84A. The bracket 84 is welded to the side frame 54 at a tip side of the extending wall 84B. Etc. are used.

  Furthermore, a plurality of mounting holes 100 used for mounting the belt retractor 50 (see FIG. 8) are formed in the base end wall 84C whose plate surface faces the front-rear direction of the seat at the rear side portion of the bracket 84.

On the other hand, the bracket 86 is formed using a hot-rolled high-tensile steel plate (SPFH590) having a plate thickness of 1.6 [mm] and a tensile strength of 590 [N / mm ² ] or more as an example.

  A plurality of mounting holes 102 used for mounting the belt retractor 50 (see FIG. 8) are formed in the proximal end wall 86C of the rear side portion of the bracket 86 whose plate surface faces the front-rear direction of the seat.

  The length of the base end wall 86C in the sheet width direction is longer than the length of the base end wall 84C of the bracket 84 in the sheet width direction. Except for this point, the bracket 86 is similar to the bracket 84. It is configured.

  In this configuration, one (left side in the figure) of the belt retractor 50 is attached to the bracket 84 using a plurality of bolts 94 as shown in FIG. When the belt retractor 50 is attached to the bracket 84, the belt retractor 50 is disposed between the base end wall 84C of the bracket 84 and the cross member 68 and the cross member 74 in the seat front-rear direction.

  The other (right side in the figure) belt retractor 50 is attached to the bracket 86 using a plurality of bolts 94. When the belt retractor 50 is attached to the bracket 86, the belt retractor 50 is disposed between the proximal end wall 86 </ b> C of the bracket 86, the cross member 68, and the cross member 74 in the seat longitudinal direction.

  In this embodiment, the belt retractor 50 attached to the bracket 86 is used for an occupant seated on the seat 10 (see FIG. 6). On the other hand, the belt retractor 50 attached to the bracket 84 is used for an occupant sitting on a seat (not shown) arranged next to the seat 10.

(Other)
In the upper part of the back frame 32 (see FIG. 8), as shown in FIGS. 6 (A), (B) and 7, a long belt-shaped webbing 90 fed from a belt retractor 50 attached to a bracket 86 is provided. A shoulder anchor 92 that supports the middle part of the slidably movable portion is attached. Further, a tongue plate 96 is movably supported on the webbing 90.

  A buckle 98 to which the tongue plate 96 is attached (fixed) is attached to one side frame 54 (see FIG. 3). Further, an anchor 88 that supports the tip of the webbing 90 is attached to the other side frame 54 (see FIG. 3) (see FIG. 7).

(Action / Effect)
When the passenger P sits on the seat 10 and the tongue plate 96 is fixed to the buckle 98, the passenger P is sandwiched between the webbing 90 and the back cushion 16, as shown in FIG.

  In this state, for example, when a vehicle on which the occupant D is riding collides with another vehicle or the like from the front, the occupant D tends to move forward with respect to the back cushion 16 due to inertial force. However, the movement of the occupant D is suppressed by the webbing 90.

  Specifically, the webbing 90 receives a pressing force from the occupant D, and this pressing force (load) is transmitted to the belt retractor 50 via the webbing 90. Further, the transmitted load is transmitted to the bracket 86 via a proximal end wall 86C in which the mounting hole 102 of the bracket 86 is formed (see FIG. 3).

  Further, the load transmitted to the bracket 86 is transmitted to the joining part 80 disposed on the inner side in the seat width direction with respect to the bracket 86 and the side frame 54 disposed on the outer side in the seat width direction with respect to the bracket 86. Is done.

  Further, the load transmitted to the joining part 80 is transmitted to the cross member 68 and the cross member 74. Further, the load transmitted to the cross member 68 and the cross member 74 is transmitted to the side frame 54.

  Thus, the cushion frame 30 of this embodiment has a path (load path) through which the load input to the belt retractor 50 is transmitted to each member. For this reason, it can suppress that a load concentrates on one member. In other words, each member can share the load.

  Moreover, since a load can be shared by each member, it is suppressed that the plate | board thickness of each member becomes thick, and the increase in the mass of the cushion frame 30 can be suppressed. Thus, the structure which can attach the belt retractor 50 can be obtained, after suppressing the increase in mass.

  The belt retractor 50 is disposed between the base end walls 84C and 86C of the brackets 84 and 86 and the cross member 68 and the cross member 74 in the seat front-rear direction. For this reason, the belt retractor 50 can be protected from luggage or the like.

  Further, the belt retractor 50 is disposed on the rear side of the main frame 48. For this reason, compared with the case where the belt retractor 50 is arrange | positioned under the main frame 48, the leg | foot space of the passenger | crew who is seated in the seat arrange | positioned at the back of the seat 10 can be ensured.

  Further, since the brackets 84 and 86 are joined to the side frame 54, the side frame 54 can be prevented from falling down.

  Further, the belt retractor 50 is attached to the rear side portion of the cushion frame 30. For this reason, for example, the path length (routing length) of the webbing 90 can be shortened as compared with the case where the belt retractor 50 is attached to the central portion of the cushion frame 30.

  In addition, since the path length of the webbing 90 is shortened, a space for arranging other functional members can be secured.

  Moreover, also in the seat 10, by providing the cushion frame 30, it is possible to obtain a configuration in which the belt retractor 50 can be attached while suppressing an increase in mass.

  Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments can be taken within the scope of the present invention. This will be apparent to those skilled in the art. For example, although not specifically described in the above embodiment, the position at which the seat 10 is attached may be in the front row of the vehicle, or may be in the second row or later.

  In the above-described embodiment, two belt retractors 50 are attached to the seat 10, but may be one, may not be attached, and may be attached.

  Moreover, in the said embodiment, although the bracket 84 and the bracket 86 were asymmetrical shapes, a symmetrical shape may be sufficient.

10 Seat (vehicle seat)
14 Seat cushion 30 Cushion frame 32 Back frame 52 Bracket unit 54 Side frame 68 Cross member (an example of a first cross member)
74 Cross member (example of second cross member)
80 Joining parts 82 Bracket

Claims (4)

A skeleton member that supports a seat cushion of a vehicle seat,
A pair of side frames that are disposed at both ends in the seat width direction and whose plate surfaces face the seat width direction;
A first cross member extending in the seat width direction at a rear side portion of the side frame in the front-rear direction of the side frame and spanned between the pair of side frames;
A second cross member extending along the first cross member on the lower side in the seat vertical direction with respect to the first cross member, and spanning the pair of side frames;
A joining part joined to the first cross member and the second cross member on the center side in the seat width direction, joined to the joining part, extended in the seat width direction and joined to the side frame, and a belt retractor A bracket unit having a pair of mounting brackets to be mounted;
Cushion frame with The bracket unit is disposed on the rear side in the seat front-rear direction with respect to the first cross member and the second cross member,
The cushion frame according to claim 1, wherein the belt retractor is attached to the first cross member and the second cross member side of the mounting bracket.   The said joining parts are U-shaped seeing from the upper side, The part of the both ends side of the said joining parts is joined to the said 1st cross member and the said 2nd cross member, respectively. Cushion frame. The cushion frame according to any one of claims 1 to 3,
A back frame connected to a rear side portion of the cushion frame in the front-rear direction of the seat;
A vehicle seat comprising:

Images