JP2017190065A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the versatility of a support structure of a back surface member of a seatback frame in a vehicle seat.SOLUTION: A vehicle seat 1 has a seat cushion 3 and a seatback 4. The seatback includes: a plurality of vertical frames 26 and 27 extending nearly vertically, and rotatably supported on the seat cushion; an upper frame 28 extending horizontally and bridged between the upper end parts of the adjacent vertical frames; a lower frame 29 extending horizontally below the upper frame and bridged between the adjacent vertical frames; a subframe 30 connected to the lower frame and downward projecting from the lower frame; and a plate-like back surface member 31 provided so as to abut on each of the adjacent vertical frames, and the rear portion each of the upper frame, the lower frame and the subframe. The lower end part of the back surface member is positioned below the lower end part of the subframe.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle seat mounted on a vehicle or the like.

  In the second or third row of automobiles, the seat back is provided so as to be able to rotate forward with respect to the seat cushion, and the seat back is rotated forward when the seat is not in use, so that the back of the seat back is substantially horizontal. And the floor of the luggage compartment is formed by the back of the seat back (for example, Patent Document 1). In such a seat, a back member made of a metal plate is provided on the back surface of a frame-shaped seat back frame so that a load can be placed on the back surface of the seat back.

JP 2014-234032 A

  In such a sheet, in order to suppress deformation of the back member, a support member having relatively high rigidity is provided on the back side (front side) of the back member, and the back member is supported by the support member. In the invention according to Patent Document 1, a rotation shaft is bridged between the lower ends of the left and right side frames constituting the left and right sides of the seat back frame, and the lower end of the back member is welded to the rotation shaft. However, since the reclining mechanism is provided in various forms at the lower end portion of the side frame, it may be difficult to secure a space for providing the rotation shaft due to the layout of the reclining mechanism. Therefore, the support structure for supporting the back member can be applied to various forms of seats by avoiding the lower end portion of the side frame.

  This invention makes it a subject to improve the versatility of the support structure of the back member of a seat back frame in a vehicle seat in view of the above background.

  In order to solve the above problems, one aspect of the present invention is a vehicle seat (1) having a seat cushion (3) and a seat back (4), wherein the seat back extends substantially vertically, and the seat A plurality of vertical frames (26, 27) rotatably supported by a cushion; an upper frame (28) extending between left and right and extending between upper ends of the adjacent vertical frames; and the upper frame A lower frame (29) that extends to the left and right below and spans between the adjacent vertical frames, and a subframe (30) that is coupled to the lower frame and protrudes downward from the lower frame are adjacent to each other. Each of the vertical frames, and a plate-like back member (31) provided so as to contact the rear part of each of the upper frame, the lower frame, and the sub-frame, The lower end of the back member may be positioned lower than the lower end portion of the subframe.

  According to this aspect, since the lower end of the back member is supported by the subframe, the rigidity of the back member is improved. Since the sub-frame has a structure coupled to the lower frame instead of the vertical frame, it is easy to secure an arrangement space for the sub-frame. For example, the subframe can extend downward without interfering with a reclining mechanism provided at the lower end of the vertical frame.

  In the above aspect, the subframe may form a frame structure alone or in cooperation with the lower frame.

  According to this aspect, the area in which the subframe can support the back member is increased.

  In the above aspect, the lower frame has a central portion (29C) protruding rearward with respect to both left and right end portions, and the central portion of the lower frame is in contact with the front surface of the back member. Good.

  According to this aspect, since the back member is supported by the lower frame, the rigidity of the back member is improved.

  Moreover, said aspect WHEREIN: The said center part of the said lower frame is good to be welded to the said back member.

  According to this aspect, the rigidity of the back member is improved.

  In the above aspect, the back member has a reinforcing structure (41) protruding forward and extending vertically from above the lower frame to below the lower frame, and the front surface (41A) of the reinforcing structure is The lower frame may be in contact with the rear surface of the central portion.

  According to this aspect, the rigidity of the back member is improved by the reinforcing structure. Further, since the back member abuts on the lower frame in the reinforcing structure, deformation at the abutting portion with the lower frame of the back member is suppressed when a load is applied. Further, since the reinforcing structure has a shape protruding forward, the gap between the back member and the lower frame is filled, and the back member and the lower frame can be brought into contact with each other.

  In the above aspect, the lower end portion of the back member may be provided with a projecting piece portion (43C) that protrudes forward and is engaged with the lower end surface of the subframe.

  According to this aspect, since the back member is locked to the subframe at the protruding piece portion, the positional deviation with respect to the subframe is suppressed.

  In the above aspect, the back member may be welded to the subframe.

  According to this aspect, the rigidity of the back member is improved.

  Moreover, said aspect WHEREIN: The said back member has the bending structure (43) which protruded toward the front in the lower part, and it is good for the said bending structure to contact | abut to the said sub-frame.

  According to this aspect, the rigidity of the back member is improved by the bent structure. In addition, since the back member abuts on the subframe in the bent structure, deformation at the contact portion of the back member with the subframe is suppressed when a load is applied. Further, since the bent structure has a shape protruding forward, the gap between the back member and the sub frame is filled, and the back member and the sub frame can be brought into contact with each other.

  In the above aspect, the back member may have a cutout portion cut out upward at a portion corresponding to the left and right sides of the subframe.

  According to this aspect, since the easily deformable portion of the back member is cut out in advance, the deformation of the back member is suppressed.

  In the above aspect, the lower end portion of the subframe may be disposed below the rotation center of the vertical frame.

  According to this aspect, the seat back can be extended downward.

  According to the above configuration, in the vehicle seat, the versatility of the support structure for the back member of the seat back frame can be enhanced.

The perspective view which looked at the vehicle seat which concerns on embodiment from the left front The perspective view which looked at the frame of the vehicular seat concerning an embodiment from the left front Front view of a vehicle seat according to an embodiment Rear view of a vehicle seat according to an embodiment VV sectional view of FIG. VI-VI sectional view of FIG.

  Hereinafter, an embodiment in which a vehicle seat according to the present invention is applied to a rear seat of an automobile (including the second row and the third row) will be described with reference to the drawings. In the following description, the left and right are determined based on the occupant seated on the seat. In the left-right direction, the center side of the sheet is referred to as inward and the opposite side is referred to as outward. About the same structure provided in right and left pair, a common number is attached | subjected and description is abbreviate | omitted. In addition, as will be described later, the shape and posture of the rear seat change between the usage form (sitting form) and the storage form. Unless otherwise specified, the shape of each component will be described based on the usage form.

  A seat 1 shown in FIG. 1 constitutes a right seat 1A and a center seat 1B of a rear seat of an automobile. The seat 1 includes a seat cushion 3 that is rotatably provided on a floor 2 of an automobile, and a seat back 4 that is rotatably supported by the seat cushion 3. As shown in FIGS. 1 and 2, the seat cushion 3 includes a seat cushion frame 5 as a skeleton, a pad 3A supported by the seat cushion frame 5, and a skin material 3B covering the pad 3A. The seat back 4 includes a seat back frame 6 as a skeleton, a pad 4A supported by the seat back frame 6, and a skin material 4B covering the pad 4A. An armrest 8 is rotatably supported at a portion of the seat back 4 corresponding to the central seat 1B. A right headrest 9A for the right seat is provided at the upper end portion of the right seat 1A of the seat back 4, and a central headrest 9B for the central seat is provided at the upper end portion of the central seat 1B of the seat back 4.

  As shown in FIG. 2, the seat cushion frame 5 includes a pair of left and right cushion side frames 11A, 11B extending in the front-rear direction, a front member 12 spanned between the front ends of the cushion side frames 11A, 11B, and each cushion side frame. A rear member 13 spanned between the rear ends of the frames 11A and 11B, a first intermediate member 14 spanned between the front and rear intermediate portions of the cushion side frames 11A and 11B, and a front end extending in the front and rear directions. A cushion intermediate frame 15 coupled to an intermediate portion in the left-right direction of the intermediate member 14 and a rear end coupled to an intermediate portion in the left-right direction of the rear member 13, and a cushion intermediate frame 15 extending left and right and the left cushion side frame 11A , 11B coupled to the second intermediate member 16 and the cushion intermediate frame 15 And a first intermediate member 14 and the rear member 13 and the bridged a plate-like cushion pan frame 17 extends towards the back and forth. A bracket 18 protruding upward is provided at the rear end portion of the left cushion side frame 11A, the rear end portion of the cushion intermediate frame 15, and the rear end portion of the right cushion side frame 11B.

  The right cushion side frame 11B and the cushion intermediate frame 15 are supported by the floor 2 via the slide rails 21 respectively. Each slide rail 21 has a lower rail extending in the front-rear direction and an upper rail supported so as to be slidable on the lower rail. The right cushion side frame 11 </ b> B and the cushion intermediate frame 15 are coupled to the upper rail of each slide rail 21. The front end of each lower rail is supported by a support member 22 coupled to the floor 2 so as to be rotatable about an axis extending left and right. A locking device (not shown) that can be selectively coupled to a striker (not shown) provided on the floor 2 is provided at the rear end of each lower rail.

  2 and 3, the seat back frame 6 includes a left vertical frame 25, an intermediate vertical frame 26, a right vertical frame 27, an upper frame 28, a lower frame 29, a sub frame 30, and a back pan frame 31. doing. The left vertical frame 25, the intermediate vertical frame 26, and the right vertical frame 27 are arranged at intervals from each other in the order described, and extend substantially vertically in parallel with each other. The upper frame 28 is stretched over the upper ends of the left vertical frame 25, the intermediate vertical frame 26, and the right vertical frame 27. The upper frame 28 extends to the left and right, is connected to the upper end of the left vertical frame 25 at the left end, is connected to the upper end of the right vertical frame 27 at the right end, and is the upper end of the intermediate vertical frame 26 at the middle in the left and right direction. Connected to.

  A portion corresponding to the right seat 1A of the upper frame 28 is provided with a pair of right and left headrest supports 35A for supporting the right headrest 9A. A portion of the upper frame 28 corresponding to the central seat 1B is provided with a pair of left and right central headrest supports 35B for supporting the central headrest 9B. The headrest supports 35A and 35B are cylindrical brackets that receive a pair of left and right headrest pillars (not shown) protruding from the headrests 9A and 9B. For example, a resin collar may be inserted into the headrest supports 35A and 35B, and a headrest pillar may be inserted into the collar.

  In this embodiment, the upper half part of the left vertical frame 25, the upper frame 28, and the right vertical frame 27 is formed by a continuous pipe member. The lower half of the right vertical frame 27 is formed of a sheet metal member and is coupled to the upper half of the pipe member. The intermediate vertical frame 26 is formed in a closed cross-sectional structure by combining sheet metal members.

  A lower end of the left vertical frame 25 is rotatably supported by a bracket 18 provided at a rear end of the left cushion side frame 11A via a reclining mechanism 33. The lower end of the right vertical frame 27 is rotatably supported by a bracket 18 provided at the rear end of the right cushion side frame 11B via a reclining mechanism 33. The lower end of the intermediate vertical frame 26 is rotatably supported by a bracket 18 provided at the rear end of the cushion intermediate frame 15. The rotation axes of the left vertical frame 25, the intermediate vertical frame 26, and the right vertical frame 27 are arranged coaxially with each other.

  The lower frame 29 extends from the upper frame 28 to the left and right with a gap therebetween, and is spanned between the intermediate vertical frame 26 and the right vertical frame 27. The lower frame 29 is formed from a metal pipe or a metal rod. The lower frame 29 has a left end portion 29 </ b> A coupled to the intermediate vertical frame 26 and a right end portion 29 </ b> B coupled to the right vertical frame 27. A center portion 29C in the left-right direction of the lower frame 29 protrudes rearward with respect to the left end portion 29A and the right end portion 29B, and extends linearly to the left and right.

  The lower frame 29 is disposed at the center of the intermediate vertical frame 26 and the right vertical frame 27 in the front-rear direction. The rear surfaces of the left end portion 29A and the right end portion 29B of the lower frame 29 are disposed in front of the rear surface of the intermediate vertical frame 26 and the rear surface of the right vertical frame 27.

  The sub frame 30 is coupled to the lower frame 29 by welding or the like, for example, and protrudes downward from the lower frame 29. The subframe 30 may be formed from a metal rod, a metal pipe, or a sheet metal member. The subframe 30 may form a frame-like structure alone or in cooperation with the lower frame 29. In the present embodiment, the subframe 30 is obtained by bending a metal rod into a substantially rectangular frame shape. Both end portions of the metal rod constituting the subframe 30 are arranged apart from each other, and the frame shape is a shape that is partially cleaved. The subframe 30 includes a pair of left and right end portions 30A coupled to the center portion 29C of the lower frame 29, a pair of left and right vertical side portions 30B extending downward from each end portion, and lower ends of the respective vertical side portions 30B. It has a horizontal side portion 30 </ b> C extending linearly to the left and right so as to be connected. In other embodiments, each end of the sub-frame 30 may be coupled to the left end 29A and the right end 29B of the lower frame 29. The subframe 30 forms a rectangular frame shape in cooperation with the lower frame 29.

  The sub frame 30 is disposed at the approximate center of the lower frame 29 in the left-right direction. The length of the horizontal side portion 30 </ b> C, that is, the length of the sub frame 30 in the left-right direction is formed shorter than the length of the lower frame 29. Further, the length of the lateral side portion 30C is set longer than the length between the pair of right headrest supports 35A. Each right headrest support 35A is disposed between the left and right vertical side portions 30B of the subframe 30 in the left-right direction. The left vertical side portion 30 </ b> B of the sub-frame 30 is disposed at a right interval with respect to the intermediate vertical frame 26. The vertical side portion 30 </ b> B on the right side of the sub-frame 30 is arranged at a left interval with respect to the right vertical frame 27.

  The rear surface of the sub frame 30 is disposed in front of the rear surface of the intermediate vertical frame 26 and the rear surface of the right vertical frame 27.

  The horizontal side portion 30 </ b> C of the sub frame 30 is disposed below the rotation center of each vertical frame 25, 26, 27. That is, the lower end portion of the sub frame 30 is disposed below the rotation center of each vertical frame 25, 26, 27. Further, the horizontal side portion 30 </ b> C of the sub frame 30 may be disposed below the lower end edge of at least one of the intermediate vertical frame 26 and the right vertical frame 27.

  The back pan frame 31 is a back member that forms the back surface of the seat back frame 6 and is formed of a metal plate. As shown in FIGS. 2 to 4, the back pan frame 31 is provided behind the left vertical frame 25, the intermediate vertical frame 26, the right vertical frame 27, the upper frame 28, the lower frame 29, and the subframe 30. . The back pan frame 31 is in contact with the rear surfaces of the intermediate vertical frame 26 and the right vertical frame 27, the upper frame 28, the lower frame 29, and the subframe 30 that are adjacent to each other. The back pan frame 31 is also in contact with the rear surface of the left vertical frame 25. The back pan frame 31 is 1/2 or more of the area defined by the intermediate vertical frame 26, the right vertical frame 27, the upper frame 28 and the lower frame 29, and 1 / of the area defined by the subframe 30 and the lower frame 29. It is preferable to be provided so as to cover two or more.

  A plurality of beads 41 as reinforcing structures are formed on the main surface facing the front and rear of the back pan frame 31. Each bead 41 is a convex portion protruding forward with respect to the main surface. Each bead 41 is formed by press molding or the like, and its rear surface side is a hollow portion. Each bead 41 extends vertically above the lower frame 29 and below the lower frame 29. The bead 41 has a protruding end surface 41A formed on a plane facing front and rear. As shown in FIGS. 5 and 6, the bead 41 is in contact with the rear surface of the center portion 29 </ b> C of the lower frame 29 at the protruding end surface 41 </ b> A. As shown in FIGS. 2 to 6, the projecting end surfaces 41 </ b> A of the plurality of beads 41 are in contact with the rear surface of the lower frame 29 in the present embodiment. A gap between the back pan frame 31 and the lower frame 29 is filled with a bead 41 protruding forward with respect to the main surface so that the back pan frame 31 can come into contact with the lower frame 29. In the protruding end surface 41A, a lightening hole 41B may be formed.

  As shown in FIGS. 2 to 4, the lower part of the back pan frame 31 has an extension portion 31 </ b> A extending downward at a portion corresponding to the subframe 30 when viewed from the front and rear, and a portion corresponding to the intermediate vertical frame 26. Has a cutout portion 31B cut out so as to be recessed upward. As shown in FIGS. 3 and 6, a bent structure 43 that is bent and protrudes forward is provided at the lower portion of the extension portion 31A. The bending structure 43 extends forward with respect to the upper portion of the extension portion 31A, the first plate portion 43A whose surface faces up and down, and the second plate whose surface extends downward from the tip of the first plate portion 43A and whose surface faces front and rear. Part 43B. The first plate portion 43A and the second plate portion 43B extend left and right. The front surface of the second plate portion 43B is in contact with the rear surfaces of the left and right vertical side portions 30B and the horizontal side portion 30C of the subframe 30. A gap between the back pan frame 31 and the sub frame 30 is filled by a bent structure 43 protruding forward with respect to the main surface, and the back pan frame 31 can come into contact with the sub frame 30.

  A protruding piece 43C protruding forward is formed on the lower edge of the second plate portion 43B. The projecting piece portion 43 </ b> C is in contact with the lower surface of the lateral side portion 30 </ b> C of the subframe 30.

  The back pan frame 31 is welded to the upper frame 28 at the upper edge. As shown in FIGS. 5 and 6, the back pan frame 31 is welded to the lower frame 29 at a portion in contact with the lower frame 29, and is welded to the lateral side portion 30 </ b> C of the subframe 30 at the protruding piece portion 43 </ b> C. (W is attached to the welded portion in FIGS. 5 and 6). The back pan frame 31 is welded to the intermediate vertical frame 26 and the right vertical frame 27. The welding is performed by a known method such as arc welding, projection welding, or laser welding. In the present embodiment, the welding is performed by arc welding or projection welding.

  A reinforcing plate 45 is coupled to a portion of the back pan frame 31 positioned between the left vertical frame 25 and the intermediate vertical frame 26. An armrest frame 8A that forms a skeleton of the armrest 8 is rotatably supported by the reinforcing plate 45.

  The seat 1 configured as described above has a folded configuration in which the seat back 4 is in a substantially horizontal posture by rotating the seat back 4 forward with respect to the seat cushion 3. The back surface of the seat back 4 is supported by a back pan frame 31 provided on the inner side of the skin and constitutes a floor surface (base surface). Further, the folding seat 1 rotates forward around the support member 22 by releasing the engagement between the locking device provided at the rear portion of the slide rail 21 and the striker provided on the floor 2. Thus, the seat cushion 3 has a storage configuration extending substantially vertically.

  In the seat 1 according to the present embodiment, since the lower end of the back pan frame 31 is supported by the sub frame 30, the rigidity of the back pan frame 31 is improved. Since the sub-frame 30 has a structure coupled to the lower frame 29 instead of the right vertical frame 27 and the intermediate vertical frame 26, it is easy to secure the arrangement space of the sub-frame 30. Since the reclining mechanism 33 is provided at the lower end portion of the right vertical frame 27, it is difficult to secure the arrangement space of the subframe 30. Since the sub frame 30 is provided on the lower frame 29, the sub frame 30 and the back pan frame 31 can be easily extended below the rotation center of the right vertical frame 27.

  Since the center portion 29C of the lower frame 29 protrudes rearward with respect to the left end portion 29A and the right end portion 29B and is in contact with the front surface of the back pan frame 31, the back pan frame 31 is supported by the lower frame 29, The rigidity of the frame 31 is improved. In particular, since the center portion 29C of the lower frame 29 is in contact with the front surface of the reinforcing structure formed on the back pan frame 31, when a load is applied to the back pan frame 31, Deformation at the contact portion is suppressed. Further, since the reinforcing structure is provided so as to straddle the lower frame 29 in the vertical direction, a load applied to a wide range of the back pan frame 31 is supported by the lower frame 29.

  Since the back pan frame 31 is in contact with the rear surfaces of the left and right vertical side portions 30B of the subframe 30 in the bent structure 43 and supported by the subframe 30, the rigidity is improved. In particular, since the bent structure 43 with relatively high rigidity is in contact with the subframe 30, deformation at the contact portion of the back pan frame 31 with the subframe 30 is suppressed when a load is applied.

  Since the back pan frame 31 is locked to the back pan frame 31 at the projecting piece 43C, displacement and deformation are suppressed.

  The back pan frame 31 has a notch 31 </ b> B in a portion corresponding to the left and right sides of the sub frame 30. Thereby, since the easily deformable portion of the back pan frame 31 is cut out in advance, the deformation of the back pan frame 31 is suppressed.

  Since the back pan frame 31 is welded to the upper frame 28, the lower frame 29, and the sub frame 30, displacement and deformation of the back pan frame 31 are suppressed.

  Although the description of the specific embodiment is finished as described above, the present invention is not limited to the above embodiment and can be widely modified. For example, in the above embodiment, the shape of the sub-frame 30 is a substantially rectangular frame shape in which a part is cleaved. However, in other embodiments, the sub-frame 30 may be formed in a frame shape having a continuous outer periphery. Further, the shape of the subframe 30 may be a T shape, an H shape, or an I shape. A plurality of subframes 30 may be provided.

1: Seat 3: Seat cushion 4: Seat back 5: Seat cushion frame 6: Seat back frame 25: Left vertical frame 26: Middle vertical frame 27: Right vertical frame 28: Upper frame 29: Lower frame 29A: Left end 29B: Right end portion 29C: Center portion 30: Subframe 30A: End portion 30B: Vertical side portion 30C: Horizontal side portion 31: Back pan frame (back member)
31A: Extension part 31B: Notch part 41: Bead (reinforcement structure)
41A: Projection end face 43: Bending structure 43C: Projection piece

Claims (10)

A vehicle seat having a seat cushion and a seat back,
The seat back is
A plurality of vertical frames extending substantially up and down and rotatably supported by the seat cushion;
An upper frame extending left and right and spanned between the upper ends of the adjacent vertical frames;
A lower frame that extends to the left and right below the upper frame and spans between the adjacent vertical frames;
A subframe coupled to the lower frame and projecting downward from the lower frame;
Each of the adjacent vertical frames, a plate-like back member provided so as to contact the rear part of each of the upper frame, the lower frame, and the sub-frame,
The vehicle seat according to claim 1, wherein a lower end portion of the back member is positioned below a lower end portion of the subframe.   The vehicle seat according to claim 1, wherein the sub-frame forms a frame-shaped structure alone or in cooperation with the lower frame. The lower frame has a central portion that protrudes backward with respect to the left and right ends,
The vehicle seat according to claim 1, wherein the central portion of the lower frame is in contact with a front surface of the back member.   The vehicle seat according to claim 3, wherein the central portion of the lower frame is welded to the back member. The back member has a reinforcing structure that protrudes forward and extends vertically from above the lower frame to below the lower frame;
The vehicle seat according to claim 3 or 4, wherein a front surface of the reinforcing structure is in contact with a rear surface of the central portion of the lower frame.   The projecting piece part which protrudes toward the front and is latched by the lower end surface of the said sub-frame is provided in the lower end part of the said back member, The any one of Claims 1-5 characterized by the above-mentioned. Vehicle seats as described in one section.   The vehicle seat according to any one of claims 1 to 6, wherein the back member is welded to the subframe. The back member has a bent structure projecting forward at the lower part,
The vehicle seat according to any one of claims 1 to 7, wherein the bent structure is in contact with the subframe.   The said back member has a notch part notched toward the upper part in the part corresponding to the left-right side of the said sub-frame, The claim 1 characterized by the above-mentioned. Vehicle seats.   The vehicle seat according to any one of claims 1 to 9, wherein a lower end portion of the sub frame is disposed below a rotation center of the vertical frame.

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