JP2017094924A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a vehicle seat which can make an occupant difficult to feel that a seat cushion length becomes long when the occupant tilts a seat back rearward.SOLUTION: A vehicle seat 10 comprises: a seat cushion 12 on which an occupant P is seated; a seat back 14 which is constituted so as to be tiltable to a fore-and-aft direction with a lower end part arranged at a rear side of the seat cushion 12 as a center, and supports the back of the occupant P; and a support member 50 which is incorporated in a front end part of the seat cushion 12, moves to a rear side accompanied by the rearward tilt of the seat back 14, and expands an elastic deformation region of the front end part of the seat cushion 12 to a rear side more than that before the rearward tilt of the seat back 14.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vehicle seat.

  Cushion length variable seats that can change the seat cushion length according to the size of the occupant's body by supplying and discharging air to the air bag built in the front part of the seat cushion have been It is known (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2015-47385

  By the way, in the vehicle seat in which the seat back can be reclined (backward tilted), when the seatback is reclined, the occupant tilts backward while moving to the seatback side (rear side). Therefore, some passengers may feel that the seat cushion length has become longer, and may feel uncomfortable, such as feeling a pressure.

  Therefore, an object of the present invention is to obtain a vehicle seat that makes it difficult to feel that the seat cushion length has become longer when the occupant tilts the seat back backward.

  In order to achieve the above object, a vehicle seat according to claim 1 of the present invention includes a seat cushion on which an occupant is seated and a lower end portion disposed on a rear side of the seat cushion in a front-rear direction. A seat back that is tiltable and supports the back of the occupant, and is built in the front end portion of the seat cushion, moves to the rear side as the seat back tilts backward, and is rearward at the front end portion of the seat cushion. And a support member that enlarges the elastic deformation area toward the side more than before the rearward inclination of the seat back.

  According to the first aspect of the present invention, the support member built in the front end portion of the seat cushion moves to the rear side as the seat back tilts backward, and elastically deforms to the rear side at the front end portion of the seat cushion. Make the area larger than before the back tilt of the seat back. Therefore, when the occupant tilts the seat back backward, the front of the seat cushion is pressed rearward by the occupant, whereby the length in the front-rear direction of the front end portion of the seat cushion can be shortened. Thus, when the occupant tilts the seat back backward, it becomes difficult to feel that the seat cushion length has become longer.

  Further, the vehicle seat according to claim 2 is the vehicle seat according to claim 1, and is a lever member that is built in the seat back and tilts backward in conjunction with the backward tilt of the seat back; A link mechanism that moves the support member to the rear side in conjunction with the backward tilting of the lever member.

  According to the second aspect of the present invention, the support member moves rearward in conjunction with the backward tilt of the seat back by the link mechanism. Therefore, the manufacturing cost of the vehicle seat is reduced as compared with a configuration in which the support member moves rearward as the seat back is tilted backward by the electrical element (actuator).

  Further, the vehicle seat according to claim 3 is the vehicle seat according to claim 1 or claim 2, wherein the front surface of the support member is the front in a side view as viewed from the left-right direction of the seat cushion. The curved surface is curved to the side.

  According to the third aspect of the present invention, the front surface of the support member is a curved surface that curves to the front side in a side view as viewed from the left-right direction of the seat cushion. Therefore, the front end portion of the seat cushion is appropriately supported in the standard state of the vehicle seat in which the seat back is not tilted backward as compared with the configuration in which the front surface of the support member is not a curved surface curved forward.

  According to the first aspect of the invention, when the occupant tilts the seat back backward, it can be made difficult to feel that the seat cushion length has become longer.

  According to the invention which concerns on Claim 2, the manufacturing cost of the vehicle seat can be reduced.

  According to the third aspect of the invention, the front end portion of the seat cushion can be appropriately supported in the standard state of the vehicle seat without tilting the seat back backward.

It is a perspective view which shows the vehicle seat which concerns on this embodiment. It is a disassembled perspective view which shows the internal structure of the vehicle seat which concerns on this embodiment. It is a longitudinal section showing the standard state of the vehicular seat concerning this embodiment. It is a longitudinal cross-sectional view which shows the reclining state of the vehicle seat which concerns on this embodiment.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. For convenience of explanation, an arrow UP appropriately shown in each drawing is an upward direction of the vehicle and the vehicle seat 10, an arrow FR is a forward direction of the vehicle and the vehicle seat 10, and an arrow RH is a right direction of the vehicle and the vehicle seat 10. To do. Moreover, in the following description, when it mentions the up-down, front-back, left-right direction without mentioning specially, it shall show the up-down, front-back, left-right (vehicle width direction) of the vehicle and vehicle seat 10.

  As shown in FIG. 1, the vehicle seat 10 includes a seat cushion 12 on which an occupant P (see FIGS. 3 and 4) sits, and a front-rear direction centering on a lower end portion disposed on the rear side of the seat cushion 12. The seat back 14 is configured to be tiltable and supports the back (upper body) of the occupant P, and the headrest 16 is provided at the upper end of the seat back 14 and supports the head of the occupant P.

  The vehicle seat 10 shown in FIG. 1 is for the left front seat of the vehicle, and a cover body 18 containing a reclining device (not shown) is disposed outside the seat cushion 12 in the vehicle width direction. A seat slide rail 20 extending in the front-rear direction is disposed below the seat cushion 12.

  As shown in FIG. 2, the seat slide rail 20 extends in the front-rear direction and is fixed to the upper surface of a floor cross member (not shown), and extends in the front-rear direction, and on the upper portion of the lower rail 22. And an upper rail 24 provided.

  A groove portion 22A along the front-rear direction is formed at the upper center of the lower rail 22, and a protrusion 24A along the front-rear direction is formed at the lower center of the upper rail 24. The upper rail 24 is movable along the lower rail 22 in the front-rear direction by fitting the projecting portion 24 </ b> A to the groove 22 </ b> A so as to be slidable.

  In addition, a cushion pad 13 (see FIGS. 3 and 4) and a seat cushion frame 30 as a skeleton of the seat cushion 12 are provided inside the seat cushion 12. The seat cushion frame 30 includes a pair of left and right cushion side frames 32, a front cushion frame 34, a front connection member 36, and a rear connection member 38.

  The pair of left and right cushion side frames 32 are formed in a substantially rectangular flat plate shape whose longitudinal direction is the longitudinal direction, and are disposed so as to be spaced apart from each other in the left-right direction so that the thickness direction thereof is the left-right direction. ing. A front cushion frame 34 that can support the thigh of the occupant P from below is disposed between the front end portions of the pair of left and right cushion side frames 32.

  A front connection member 36 is installed on the front part of the pair of left and right cushion side frames 32. The front connection member 36 is formed in a cylindrical shape having the left-right direction as an axial direction, and end portions 36 </ b> A in the axial direction are respectively inserted into through holes 32 </ b> A formed at the front portions of the cushion side frames 32. Attached to the front part of each cushion side frame 32.

  Further, end portions 36 </ b> A in the axial direction of the front side connecting member 36 protrude outward from the through holes 32 </ b> A of the respective cushion side frames 32. The upper ends of the pair of left and right front support members 26 that are flat are attached to the end portions 36A that protrude outward from the outer surfaces of the cushion side frames 32, respectively. In addition, the lower end part of each front side supporting member 26 is attached to the front upper surface of the upper rail 24 via a bracket 25, respectively.

  In addition, a rear connection member 38 is provided at the rear end of the pair of left and right cushion side frames 32. Similarly to the front side connecting member 36, the rear side connecting member 38 is formed in a cylindrical shape having the left-right direction as an axial direction, and end portions 38A in the axial direction are respectively formed on the rear end portions of the cushion side frames 32. It is inserted into the formed through hole 32 </ b> B and attached to the rear end portion of each cushion side frame 32.

  Further, end portions 38 </ b> A in the axial direction of the rear side connecting member 38 protrude outward from the through holes 32 </ b> B of the respective cushion side frames 32. And the upper end part of the left-right paired rear side support member 28 made into flat form is attached to each edge part 38A which protrudes outside from the outer surface of each cushion side frame 32, respectively. In addition, the lower end part of each rear side support member 28 is attached to the rear upper surface of the upper rail 24 via a bracket 27, respectively.

  Accordingly, the seat cushion frame 30 is supported by the upper rail 24 and can move in the front-rear direction along the lower rail 22. A support plate 50 is disposed on the front side of the front cushion frame 34 as a support member that can support legs (calves) below the knees of the occupant P. The support plate 50 will be described in detail later together with a link mechanism 60 described later.

  Inside the seat back 14, a cushion pad 15 (see FIGS. 3 and 4) and a seat back frame 40 as a skeleton of the seat back 14 are provided. The seat back frame 40 includes a pair of left and right back side frames 42, a back upper frame 44, a back lower frame 46, and a lower connecting member 48.

  The pair of left and right back side frames 42 are formed in a substantially rectangular flat plate shape whose vertical direction is the longitudinal direction, and are arranged so as to be spaced apart from each other in the left and right direction so that the plate thickness direction is the left and right direction. ing. And the upper end part of each back side frame 42 is integrally connected by the back upper frame 44, and the lower end part of each back side frame 42 is by the flat back lower frame 46 by which the plate | board thickness direction was made into the front-back direction. They are connected together.

  A lower connecting member 48 is installed at the lower end of each back side frame 42 on the front side of the back lower frame 46. The lower connecting member 48 is formed in a cylindrical shape having the left-right direction as an axial direction, and an end portion in the axial direction is attached to a lower end portion of each backside frame 42.

  And the lower end part of the seat back frame 40 (back side frame 42) is arrange | positioned through the reclining mechanism which is not shown in figure at the rear-end part of the seat cushion frame 30 (cushion side frame 32), and the seat back 14 is the lower end. It is comprised so that it can tilt in the front-back direction centering on a part.

  Here, the support plate 50 built in the front end portion of the seat cushion 12 and the link mechanism 60 that moves the support plate 50 to the rear side as the seat back 14 is tilted backward (in conjunction) will be described. Note that the front end portion of the seat cushion 12 is a section from the front surface of the seat cushion 12 to the front end portion of the front cushion frame 34 in a longitudinal sectional view as seen from the left-right direction (vehicle width direction) shown in FIGS. Point to.

  As shown in FIG. 2 and FIG. 3, the support plate 50 is formed in a substantially arcuate plate shape that is curved forward in a side view (longitudinal sectional view) viewed from the left-right direction (vehicle width direction). The curved surface (front surface) can support the leg part below the knee of the occupant P from the rear side. Note that a pair of left and right substantially rectangular flat plate-shaped guide members 52 extend rearward from the left and right sides of the rear surface of the support plate 50, and the inner surfaces of the guide members 52 facing each other are respectively front and rear. Guide protrusions 54 are formed along the direction.

  Each guide projection 54 is fitted in a guide groove (not shown) along the front-rear direction provided on both sides of the front cushion frame 34 so as to be slidable in the front-rear direction. Thus, the support plate 50 is configured to be movable in the front-rear direction on the front side of the front cushion frame 34 while being guided to both sides of the front cushion frame 34 via the respective guide members 52.

  Further, at the substantially central portion in the left-right direction on the rear surface of the support plate 50, there is a front end portion 62A of the flat plate-like first link 62 whose plate thickness direction is the left-right direction and is substantially “L” -shaped in a side view. It is fixed. And the front end part 64A of the flat plate-like 2nd link 64 by which the plate | board thickness direction is made into the left-right direction and is extended in the front-back direction is attached to the lower end part 62B of the 1st link 62 so that rotation is possible. Further, an upper end portion 66A of a flat plate-like third link 66 is attached to the rear end portion 64B of the second link 64 so that the plate thickness direction is the left-right direction and extends in the up-down direction.

  A circular through-hole 66C is formed in the center in the longitudinal direction of the third link 66, and a cylindrical (or cylindrical) first rod having an axial direction in the left-right direction is formed in the through-hole 66C. 56 is inserted in a state having a slight gap (rotatably). Then, an end portion 56A in the axial direction of the first rod 56 is inserted into a through hole 32C formed at the front end portion (front side of the through hole 32A) of each cushion side frame 32, and It is attached to the front end.

  A front end portion 68A of a flat plate-like fourth link 68 extending in the front-rear direction with the thickness direction being the left-right direction is rotatably attached to the lower end portion 66B of the third link 66. A circular through hole 68C is formed in the rear end portion 68B of the four links 68. At the rear end portion 68B of the fourth link 68, a lever member 70 whose upper end portion is fixed to the back lower frame 46 is a columnar (or cylindrical) second rod whose axial direction is the left-right direction. 58 is attached.

  More specifically, the lever member 70 is formed in a substantially rectangular flat plate shape, and its upper end is joined (fixed) to the rear surface of the back lower frame 46 by welding, screwing, or the like. A substantially rectangular cutout 72 into which the rear end portion 68B of the fourth link 68 is inserted is formed at the center of the lower end of the lever member 70.

  Further, on both sides of the lower end of the lever member 70, a cylindrical portion 74 having an axial direction in the left-right direction is integrally formed. Each cylindrical portion 74 has a through-hole 74A communicating with the through-hole 68C (having the same diameter as the through-hole 68C), and the outer diameter of the second rod 58 is substantially the same as the inner diameter of the through-hole 68C and the through-hole 74A. It is the same diameter.

  Therefore, when attaching the lever member 70 to the rear end portion 68B of the fourth link 68, first, the rear end portion 68B of the fourth link 68 is inserted into the cutout portion 72 of the lever member 70, and the through hole 68C and each through hole 74A are inserted. To communicate with. Then, the second rod 58 is inserted into each through hole 74A and the through hole 68C, and the second rod 58 is fixed to the rear end portion 68B of the fourth link 68 by welding or the like.

  As a result, the lever member 70 is attached to the rear end portion 68B of the fourth link 68 by the second rod 58, and rotates in the front-rear direction around the second rod 58 as the seatback 14 tilts in the front-rear direction. It is a possible configuration. The link mechanism 60 is configured by the first link 62, the second link 64, and the third link 66 and the fourth link 68 supported by the first rod 56.

  Next, the operation of the vehicle seat 10 configured as described above will be described in detail with reference to FIGS.

  As shown in FIGS. 3 and 4, when the occupant P changes the vehicle seat 10 from the standard state to the reclining state, the seat back 14 is tilted backward by a reclining device (not shown). Then, the lever member 70 tilts backward together with the seat back 14 with the second rod 58 as the rotation center.

  When the lever member 70 tilts backward, the fourth link 68 slides forward, and the lower end portion 66B of the third link 66 moves forward around the first rod 56 as the rotation center. Then, the upper end portion 66A of the third link 66 moves rearward with the first rod 56 as the rotation center, and slides the second link 64 rearward.

  When the second link 64 slides backward, the first link 62 slides backward, and the support plate 50 moves backward. That is, the support plate 50 moves rearward while the guide protrusions 54 of the guide member 52 are guided in the guide grooves provided on both sides of the front cushion frame 34.

  Accordingly, the front end portion of the seat cushion 12 can be elastically deformed rearward with respect to the standard state shown in FIG. 3 (the elastic deformation region toward the rear side of the front end portion of the seat cushion 12 is the rear end of the seat back 14). Because the occupant P presses the front surface of the seat cushion 12 backward with the legs below the knee, the length in the front-rear direction of the front end of the seat cushion 12 is shortened. can do.

  In other words, the length at the front end portion of the seat cushion 12 (the length from the front surface of the seat cushion 12 to the front end portion of the front cushion frame 34) is interlocked with the movement of the passenger P tilting the seat back 14 backward. The length L3 (see FIG. 3) can be made shorter than the length L3 (see FIG. 3). Therefore, the seat cushion length L2 in the reclining state can be made shorter than the seat cushion length L1 in the standard state.

  More specifically, if the length from the rear end portion of the seat cushion 12 to the front end portion of the front cushion frame 34 is L0, the seat cushion length L1 in the standard state is L1 = L0 + L3, and the seat cushion length in the reclining state L2 is L2 = L0 + L4. Here, since L4 <L3, the seat cushion length L2 in the reclining state is shorter than the seat cushion length L1 in the standard state.

  Accordingly, when the occupant P tilts the seat back 14 backward, even if the occupant P moves to the seat back 14 side (rear side), it can be made difficult to feel that the seat cushion length has become longer. And in passenger | crew P, it can suppress feeling discomfort, such as a feeling of oppression. When the occupant P returns the vehicle seat 10 from the reclining state to the standard state, the link mechanism 60 moves in the reverse direction.

  That is, the lever member 70 tilts forward to the original position together with the seat back 14 with the second rod 58 as the rotation center. When the lever member 70 tilts forward, the fourth link 68 slides backward, and the lower end portion 66B of the third link 66 moves rearward with the first rod 56 as the rotation center. Then, the upper end portion 66A of the third link 66 moves forward about the first rod 56 as the rotation center, and slides the second link 64 forward.

  When the second link 64 slides forward, the first link 62 slides forward and the support plate 50 advances. That is, the support plate 50 moves forward while the guide protrusions 54 of the guide member 52 are guided in the guide grooves provided on both sides of the front cushion frame 34.

  As a result, the elastic deformation area toward the rear side at the front end portion of the seat cushion 12 is reduced to the original area, so that the seat cushion length L1 (L1 = L0 + L3) in the standard state is changed to the seat cushion length L2 (L2 in the reclining state). = L0 + L4). Therefore, when the occupant P returns the seat back 14 to the original position (standard state), it can be made difficult to feel that the seat cushion length remains short.

  The support plate 50 is configured to move in the front-rear direction in conjunction with the tilting operation of the seat back 14 by the link mechanism 60 to which the lever member 70 is connected. That is, the support plate 50 is configured to move in the front-rear direction by mechanical elements. Therefore, the manufacturing cost of the vehicle seat 10 can be reduced as compared with the configuration in which the support plate 50 moves in the front-rear direction by an electrical element.

  For example, the support plate 50 is fixed to a rack (not shown), and a pinion (not shown) that meshes with the rack is not shown as the seat back 14 tilts. A configuration that can be rotated by an electric motor is conceivable. That is, a configuration in which the support plate 50 moves in the front-rear direction by rotating the electric motor in the forward direction or the reverse direction as the seat back 14 tilts is conceivable.

  Further, the support plate 50 is formed in a substantially arcuate plate shape that is curved forward in a side view, and the front surface thereof is a curved surface that is curved forward. Therefore, in the standard state of the vehicle seat 10 in which the seat back 14 is not tilted backward, the front end portion of the seat cushion 12 can be appropriately supported. That is, the leg part (calf) below the knee of the occupant P can be appropriately supported by the front end part of the seat cushion 12.

  Although the vehicle seat 10 according to the present embodiment has been described based on the drawings, the vehicle seat 10 according to the present embodiment is not limited to the illustrated one and does not depart from the gist of the present invention. The design can be changed as appropriate within the range. For example, the support plate 50 may be configured to be moved in the front-rear direction by an electrical element (an actuator such as an electric motor).

  Further, the support plate 50 is not limited to a configuration that is formed in a substantially arcuate plate shape that is curved forward in a side view. For example, the support plate 50 has a substantially half shape in which the axial direction is the left-right direction and the front surface is the circumferential surface. It may be formed in a columnar shape. Further, the front surface of the support plate 50 is not limited to a curved surface that is curved forward in a side view, and may be a flat surface, for example. Further, guide protrusions may be provided on both side portions of the front cushion frame 34, and guide grooves may be formed on the inner surface of the guide member 52.

DESCRIPTION OF SYMBOLS 10 Vehicle seat 12 Seat cushion 14 Seat back 50 Support plate (support member)
60 Link mechanism 70 Lever member P Crew

Claims (3)

A seat cushion on which an occupant sits,
A seat back configured to be tiltable in the front-rear direction around the lower end portion disposed on the rear side of the seat cushion, and supporting the back of the occupant;
Built in the front end portion of the seat cushion, moves to the rear side as the seat back is tilted backward, and the elastic deformation region to the rear side at the front end portion of the seat cushion is larger than that before the back tilt of the seat back. A support member to be enlarged;
Vehicle seat equipped with A lever member built in the seat back and tilted backward in conjunction with the backward tilt of the seat back;
A link mechanism for moving the support member to the rear side in conjunction with the backward inclination of the lever member;
The vehicle seat according to claim 1, comprising:   3. The vehicle seat according to claim 1, wherein a front surface of the support member is a curved surface that is curved forward in a side view of the seat cushion as viewed from the left-right direction.

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