Vehicle seat

Abstract

To restrain a change in the position of supporting the back of an occupant during reclining and to adjust the posture of a seat upper side part relative to a lower side part of a seat back during reclining.SOLUTION: A vehicle seat 10 includes a seat cushion 12 and a seat back 14. The vehicle seat 10 has a reclining part 16A which reclines the seat back 14 in a seat longitudinal direction relative to the seat cushion 12 with the seat front side as the center of rotation rather than an end of the seat back 14 on the seat lower side. The vehicle seat 10 has a middle bending part 16B to displace a seat upper side part 14A of the seat back 14 to the side of the back of a seated occupant and to the opposite side of the back of the seated occupant relative to a seat lower side part 14B, and a coordinating part 16C to coordinate actuation of the reclining part 16A and actuation of the center bending part 16B.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a vehicle seat.

Background Art

[0002] Patent Document 1 below discloses an adjustment method for a vehicle seat that can reduce the change in the support position of the occupant's back during reclining. In the method described in this document, when adjusting the tilt angle of the backrest that supports the back of the occupant sitting on the seat cushion, the backrest rotates around a rotation center defined below the reference rotation center of the occupant during reclining and in front of the end of the backrest on the seat cushion side. Specifically, in one example described in Patent Document 1 below, by providing a link mechanism that changes the position of the rotation axis of the backrest in conjunction with the tilt angle of the backrest, the backrest rotates around a rotation center defined in front of the end of the backrest on the seat cushion side. Further, in another example described in Patent Document 1 below, by providing a link mechanism configured to slide the backrest frame along the seat back frame in conjunction with the tilt angle of the backrest, the backrest rotates around a rotation center defined in front of the end of the backrest on the seat cushion side.

[0003] Also, Patent Document 1 below discloses a seat seat that realizes bending the middle part in the vertical direction of the seat back by tilting the upper part of the seat back in the front-rear direction with respect to the lower part of the seat back.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, it is desirable to suppress the change in the support position of the occupant's back during reclining and to be able to adjust the posture of the upper part of the seat with respect to the lower part of the seat back during reclining. However, the configurations described in Patent Document 1 and Patent Document 2 do not consider this point.

[0006] In view of the above facts, an object of the present invention is to obtain a vehicle seat that can suppress a change in the support position of the occupant's back during reclining and can adjust the posture of the upper part of the seat with respect to the lower part of the seat back during reclining.

Means for Solving the Problems

[0007] The vehicle seat according to the first aspect includes a seat cushion that supports the buttocks of the seated occupant from below the seat, a seat back that supports the back of the seated occupant from behind the seat, a reclining portion that reclines the seat back in the front-rear direction of the seat with respect to the seat cushion with a center of rotation on the front side of the seat rather than the lower end of the seat back on the lower side of the seat, a middle folding portion that displaces the upper part of the seat back with respect to the lower part of the seat back to the back side of the seated occupant and to the side opposite to the back of the seated occupant, and an interlocking portion that interlocks the operation of the reclining portion and the operation of the middle folding portion.

[0008] In the vehicle seat according to the first aspect, when the reclining portion operates, the seat back reclines in the front-rear direction of the seat with respect to the seat cushion about a rotation center on the front side of the seat rather than the end portion on the lower side of the seat of the seat back. In this way, by setting the rotation center of the seat back to the front side of the seat rather than the end portion on the lower side of the seat of the seat back, that is, by setting the rotation center of the seat back to the hip side of the seated occupant, it is possible to suppress a change in the support position of the occupant's back by the seat back during reclining. Further, when the middle folding portion operates, a portion on the upper side of the seat in the seat back is displaced to the back side of the seated occupant and to the side opposite to the back of the seated occupant with respect to a portion on the lower side of the seat. Here, the interlocking portion interlocks the operation of the reclining portion and the operation of the middle folding portion. Thereby, it is possible to suppress a change in the support position of the occupant's back during reclining and to adjust the posture of the portion on the upper side of the seat with respect to the portion on the lower side of the seat of the seat back during reclining.

[0009] The vehicle seat according to the second aspect is the vehicle seat according to the first aspect, wherein the reclining portion includes a plurality of reclining portion side link members connected to each other, the middle folding portion includes a plurality of middle folding portion side link members connected to each other, and a predetermined reclining portion side link member among the plurality of reclining portion side link members and a predetermined middle folding portion side link member among the plurality of middle folding portion side link members are connected via the interlocking portion.

[0010] In the vehicle seat according to the second aspect, when a plurality of reclining part side link members are displaced, the seat back reclines in the seat front-rear direction with respect to the seat cushion about a center of rotation on the seat front side rather than an end on the seat lower side of the seat back. Further, when a plurality of middle fold part side link members are displaced, a part of the seat back on the side opposite to the seat cushion is displaced toward the back side of the seated occupant and the side opposite to the back of the seated occupant with respect to a part on the seat cushion side. Here, a defined reclining part side link member among the plurality of reclining part side link members and a defined middle fold part side link member among the plurality of middle fold part side link members are connected via an interlocking part. As a result, the reclining part side link member and the middle fold part side link member connected by the interlocking part are displaced in conjunction with each other. Thereby, it is possible to suppress a change in the support position of the occupant's back during reclining and to adjust the posture of the part on the seat upper side with respect to the part on the seat lower side of the seat back during reclining.

[0011] The vehicle seat according to the third aspect is the vehicle seat according to the second aspect, wherein the plurality of reclining part side link members have a first connecting part, a second connecting part, and a third connecting part, and the first connecting part is a first link member rotatably connected to the seat cushion with the seat width direction as the axial direction, a fourth connecting part and a fifth connecting part, and the fourth connecting part is a second link member rotatably connected to the seat cushion with the seat width direction as the axial direction, a sixth connecting part and a seventh connecting part, and the sixth connecting part is rotatably connected to the seat back with the seat width direction as the axial direction, and the seventh connecting part is rotatably connected to the second connecting part with the seat width direction as the axial direction. A third link member, an eighth connecting part, a ninth connecting part, and a tenth connecting part, and the eighth connecting part is rotatably connected to the seat back with the seat width direction as the axial direction, and the ninth connecting part is rotatably connected to the fifth connecting part with the seat width direction as the axial direction, and the tenth connecting part is rotatably connected to the third connecting part with the seat width direction as the axial direction. A fourth link member, and when the first link member, the second link member, the third link member, and the fourth link member are each displaced, the seat back reclines in the seat front-rear direction with respect to the seat cushion about a rotation center on the seat front side rather than the end portion on the seat lower side of the seat back.

[0012] In the vehicle seat according to the third aspect, the seat cushion and the seat back are connected via a plurality of reclining part side link members (first link member, second link member, third link member, and fourth link part). Thereby, the seat back can be reclined in the seat front-rear direction with respect to the seat cushion about a rotation center on the seat front side rather than the end portion on the seat lower side of the seat back.

[0013] The vehicle seat according to the fourth aspect is the vehicle seat according to the third aspect, wherein the seat back has a lower side frame portion connected to the seat cushion via a plurality of the reclining portion side link members, and an upper side frame portion supported by the lower side frame portion. The middle folding portion includes a shaft member rotatably supported by the lower side frame portion with the seat width direction as the axial direction. The plurality of the middle folding portion side link members include a fifth link member, a part of which is fixed to the shaft member and another part of which the upper side frame portion is fixed to, and a sixth link member, a part of which is fixed to the shaft member. The interlocking portion includes a seventh link member, a part of which is rotatably connected to the sixth link member with the seat width direction as the axial direction and another part of which is rotatably and displaceably connected to the first link member with the seat width direction as the axial direction, and an eighth link member, a part of which is rotatably connected to the seat cushion together with the fourth connecting portion with the seat width direction as the axial direction and another part of which is rotatably and displaceably connected to the seventh link member with the seat width direction as the axial direction and with respect to the first link member.

[0014] In the vehicle seat according to the fourth aspect, when the seat back reclines, the eighth link member constituting the interlocking portion tilts and the portion of the eighth link member connected to the seventh link member is displaced along the first link member. As a result, the seventh link member tilts with respect to the eighth link member. When the seventh link member tilts with respect to the eighth link member, the sixth link member constituting the middle folding portion tilts with respect to the lower side frame portion. As a result, the shaft member to which the sixth link member is fixed rotates with respect to the lower side frame portion. Further, when the shaft member rotates, the fifth link member fixed to the shaft member tilts. As a result, the upper side frame portion tilts with respect to the lower side frame portion. As a result, the upper portion of the seat back tilts toward the back side of the seated occupant or the side opposite to the back of the seated occupant with respect to the lower portion. In this way, it is possible to adjust the posture of the upper portion of the seat back with respect to the lower portion on the seat lower side when the seat back reclines.

Advantages of the Invention

[0015] The vehicle seat according to the present invention has an excellent effect that it is possible to suppress a change in the support position of the occupant's back during reclining and to adjust the posture of the lower portion with respect to the upper portion of the seat back during reclining.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying out the Invention

[0017] The vehicle seat 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7. In the figures, the arrow FR indicates the front side of the seat, the arrow UP indicates the upper side of the seat, the arrow RH indicates the right side of the seat, and the arrow LH indicates the left side of the seat. In the following description, unless otherwise specified, the front-rear, up-down, and left-right directions indicate the front-rear in the seat front-rear direction, the up-down in the seat up-down direction, and the left-right in the seat left-right direction. Also, the seat left-right direction coincides with the seat width direction.

[0018] As shown in FIGS. 1 to 3, the vehicle seat 10 includes a seat cushion 12 that supports the buttocks of the seated occupant from below, and a seat back 14 that supports the back of the seated occupant from behind. The vehicle seat 10 also includes a link mechanism 16 and an actuator 18 that, when actuated, recline the seat back 14 and displace the upper portion 14A (the portion on the side opposite to the seat cushion 12) of the seat back 14 with respect to the lower portion 14B (the portion on the seat cushion 12 side) of the seat back 14.

[0019] The seat cushion 12 includes a cushion frame 20 that constitutes the skeleton of the seat cushion 12, and a cushion pad (not shown) attached to the cushion frame 20. The cushion frame 20 includes a pair of left and right side frame portions 22 that are arranged at intervals in the seat width direction and extend in the front-rear direction.

[0020] The seat back 14 is configured to include a back frame 24 that constitutes the skeleton of the seat back 14 and a back pad (not shown) attached to the back frame 24. The back frame 24 includes a pair of left and right lower side frame portions 26 that are arranged at intervals in the seat width direction and extend in the vertical direction. Further, the back frame 24 includes a pair of left and right upper side frame portions 27 that are arranged at intervals in the seat width direction and extend in the vertical direction. The lower end portions of the pair of left and right upper side frame portions 27 are rotatably supported by the upper end portions of the pair of left and right lower side frame portions 26 with the left - right direction as the axial direction. Thereby, the upper - side portion 14A of the seat back 14 can be displaced (tilted) with respect to the lower - side portion 14B to the back side of the seated occupant and the side opposite to the back of the seated occupant. Note that the lower end portions 26A of the pair of left and right lower side frame portions 26 are connected in the left - right direction via a cross member 28A. Also, the upper end portions and the intermediate portions in the vertical direction of the pair of left and right upper side frame portions 27 are connected in the left - right direction via a cross member 28B. Further, the lower end portions 26A of the pair of left and right lower side frame portions 26 and the rear end portions 22A of the pair of left and right side frame portions 22 of the cushion frame 20 are connected via a link mechanism 16 described later.

[0021] The link mechanism 16 includes a reclining portion 16A that reclines the seat back 14 with respect to the seat cushion 12, a middle - folding portion 16B that displaces the upper - side portion 14A of the seat back 14 with respect to the lower - side portion 14B of the seat back 14, and an interlocking portion 16C that interlocks the operation of the reclining portion 16A and the operation of the middle - folding portion 16B.

[0022] The reclining portion 16A includes a plurality of reclining portion side link members 29 that connect a pair of left and right lower side frame portions 26 and a pair of left and right side frame portions 22. Specifically, the reclining portion 16A includes a first link member 30, a second link member 32, a third link member 34, and a fourth link member 36 that connect the lower end portion 26A of the left lower side frame portion 26 and the rear end portion 22A of the left side frame portion 22. Further, the reclining portion 16A includes a first link member 30, a second link member 32, a third link member 34, and a fourth link member 36 that connect the lower end portion 26A of the right lower side frame portion 26 and the rear end portion 22A of the right side frame portion 22. Note that the first link member 30, the second link member 32, the third link member 34, and the fourth link member 36 on the left side and the first link member 30, the second link member 32, the third link member 34, and the fourth link member 36 on the right side are configured symmetrically in the seat width direction. Therefore, hereinafter, the first link member 30, the second link member 32, the third link member 34, and the fourth link member 36 on the left side will be described, and the description of the first link member 30, the second link member 32, the third link member 34, and the fourth link member 36 on the right side will be omitted.

[0023] FIG. 3 shows the vehicle seat 10 in a state where the seat back 14 is located at the first position. Further, FIG. 4 shows the vehicle seat 10 in a state where the seat back 14 is located at the second position. Note that when the seat back 14 is located at the first position, a passenger can sit on the vehicle seat 10 in a posture where the front of the vehicle can be visually recognized. Further, the state where the seat back 14 is located at the second position is a state where the seat back 14 is tilted to the most rearward side. When the seat back 14 is located at the second position, as an example, a passenger can take a doze in a posture supported by the seat back 14 from the rear side and the lower side. The following description of the first link member 30, the second link member 32, the third link member 34, the fourth link member 36, and each link member (the fifth link member 44 to the eighth link member 50) described later will be made assuming that the seat back 14 is located at the first position.

[0024] Figure 5 shows an enlarged view of the link mechanism 16 with the seat back 14 in the first position. As shown in this figure, the first link member 30 is formed in a plate shape extending in the left - right direction as the thickness direction, and is formed in an elongated shape that slopes rearward as it goes upward when viewed from the left side. The lower end portion of the first link member 30 serves as the first connection portion 30A. Further, a long hole 30D (also refer to FIG. 6) that penetrates the upper end portion of the first link member 30 in the thickness direction is formed at the upper end portion of the first link member 30. The longitudinal direction of this long hole 30D coincides with the longitudinal direction of the first link member 30. Also, the middle portion of the first link member 30 in the vertical direction serves as the second connection portion 30B. Furthermore, the portion of the first link member 30 in the vertical direction and below the second connection portion 30B serves as the third connection portion 30C. The first connection portion 30A is rotatably connected to the rear end portion 22A of the side frame portion 22 about the seat width direction as the axial direction.

[0025] The second link member 32 is formed in a plate shape extending in the left - right direction as the thickness direction, and is formed in an elongated shape that slopes rearward as it goes upward when viewed from the left side. The lower end portion of the second link member 32 serves as the fourth connection portion 32A. Also, the upper end portion of the second link member 32 serves as the fifth connection portion 32B. The fourth connection portion 32A is rotatably connected to the rear end portion 22A of the side frame portion 22 about the seat width direction as the axial direction. In a state where the fourth connection portion 32A is rotatably connected to the rear end portion 22A of the side frame portion 22 about the seat width direction as the axial direction, the fourth connection portion 32A is located on the rear side with respect to the first connection portion 30A of the first link member 30.

[0026] The third link member 34 is formed in a plate shape extending in the left-right direction as the thickness direction, and is formed in an elongated shape with the front-rear direction as the longitudinal direction when viewed from the left side. The front end portion of this third link member 34 is the sixth connecting portion 34A. Also, the rear end portion of the third link member 34 is the seventh connecting portion 34B. The sixth connecting portion 34A is rotatably connected to the lower end portion 26A of the lower side frame portion 26 about the seat width direction as the axial direction. Also, the seventh connecting portion 34B is rotatably connected to the second connecting portion 30B of the first link member 30 about the seat width direction as the axial direction.

[0027] The fourth link member 36 is formed in a plate shape extending in the left-right direction as the thickness direction, and is formed in an elongated shape with the front-rear direction as the longitudinal direction when viewed from the left side. The front end portion of this fourth link member 36 is the eighth connecting portion 36A. Also, the rear end portion of the fourth link member 36 is the ninth connecting portion 36B. Further, the intermediate portion in the front-rear direction of the fourth link member 36 is the tenth connecting portion 36C. The eighth connecting portion 36A is rotatably connected to the lower end portion 26A of the lower side frame portion 26 about the seat width direction as the axial direction. In a state where the eighth connecting portion 36A is connected to the lower end portion 26A of the lower side frame portion 26, the eighth connecting portion 36A is located on the front side and the lower side with respect to the sixth connecting portion 34A of the third link member 34 and is located on the upper side with respect to the first connecting portion 30A of the first link member 30. Also, the ninth connecting portion 36B is rotatably connected to the fifth connecting portion 32B of the second link member 32 about the seat width direction as the axial direction. Further, the tenth connecting portion 36C is rotatably connected to the third connecting portion 30C of the first link member 30 about the seat width direction as the axial direction.

[0028] As shown in FIGS. 3 and 4, since the first link member 30, the second link member 32, the third link member 34, and the fourth link member 36 that constitute the reclining portion 16A are configured as described above, the rotation center 38 of the seat back 14 is located on the front side of the lower end portion 26A of the lower side frame portion 26 of the back frame 24 and on the front side of the rear end portion 22A of the side frame portion 22 of the cushion frame 20.

[0029] As shown in FIG. 2, the actuator 18 provided between the seat back 14 and the seat cushion 12 is an actuator of a type having a lead screw 18A that linearly displaces in one direction. This actuator 18 includes the lead screw 18A and an actuator main body portion 18B that linearly displaces the lead screw 18A in one direction. Further, the actuator 18 includes a back frame fixing portion 18C formed integrally with the actuator main body portion 18B and a cushion frame fixing portion 18D provided at an end of the lead screw 18A on the side opposite to the actuator main body portion 18B. As shown in FIG. 2, the actuator 18 is disposed between a pair of left and right lower side frame portions 26 of the back frame 24 and between a pair of left and right side frame portions 22 of the cushion frame 20. The back frame fixing portion 18C of the actuator 18 is fixed to the horizontal member 28A of the back frame 24. Further, the cushion frame fixing portion 18D of the actuator 18 is fixed to the cushion frame 20. And in a state where the seat back 14 is located at the first position, the axial direction of the lead screw 18A of the actuator 18 is directed in a direction along the vertical direction. Also, a part of the actuator 18 overlaps with the reclining portion 16A in the seat width direction in a side view of the seat.

[0030] As shown in FIGS. 1 and 2, the middle folding portion 16B includes a shaft member 40 spanned between upper end portions of a pair of left and right lower side frame portions 26. This shaft member 40 is formed in a round bar shape with the left - right direction as the axial direction. Also, both sides in the left - right direction of the shaft member 40 are respectively inserted into circular openings formed at the upper end portions of a pair of left and right lower side frame portions 26. Thereby, the shaft member 40 is rotatably supported by the pair of left and right lower side frame portions 26 with the left - right direction as the axial direction.

[0031] Further, the middle folding portion 16B includes a plurality of middle folding portion side link members 42 fixed to the shaft member 40. Specifically, a fifth link member 44 and a sixth link member 46 are fixed to the left side of the shaft member 40, and a fifth link member 44 and a sixth link member 46 are fixed to the right side of the shaft member 40. Note that the fifth link member 44 and the sixth link member 46 fixed to the left side of the shaft member 40 and the fifth link member 44 and the sixth link member 46 fixed to the right side of the shaft member 40 are symmetrically configured in the sheet width direction. Therefore, hereinafter, the fifth link member 44 and the sixth link member 46 fixed to the left side of the shaft member 40 will be described, and the description of the fifth link member 44 and the sixth link member 46 fixed to the right side of the shaft member 40 will be omitted.

[0032] As shown in FIG. 5, the fifth link member 44 is formed in a plate shape extending in the left-right direction as the thickness direction, and is formed in a shape inclined rearward as it goes upward when viewed from the left side. The lower end portion of the fifth link member 44 is fixed to the left end portion of the shaft member 40. Further, the upper end portion of the fifth link member 44 is fixed to the lower end portion of the left upper side frame portion 27. Note that the fifth link member 44 is disposed on the inner side (right side) in the sheet width direction with respect to the left lower side frame portion 26.

[0033] The sixth link member 46 is formed in a plate shape extending in the left-right direction as the thickness direction, and is formed in a shape inclined rearward as it goes downward when viewed from the left side. The upper end portion of the sixth link member 46 is fixed to the left end portion of the shaft member 40. Note that the sixth link member 46 is disposed on the outer side (left side) in the sheet width direction with respect to the left lower side frame portion 26. Further, the sixth link member 46 is connected to the fifth link member 44 via the shaft member 40.

[0034] As shown in FIGS. 1 and 2, the interlocking portion 16C includes a left seventh link member 48 that connects the left sixth link member 46 and the left first link member 30, and a left eighth link member 50 that connects the left seventh link member 48 and the rear end portion 22A of the left side frame portion 22. Further, the interlocking portion 16C includes a right seventh link member 48 that connects the right sixth link member 46 and the right first link member 30, and a right eighth link member 50 that connects the right seventh link member 48 and the rear end portion 22A of the right side frame portion 22. The left seventh link member 48, the left eighth link member 50, the right seventh link member 48, and the right eighth link member 50 are symmetrically configured in the seat width direction. Therefore, hereinafter, the left seventh link member 48 and the left eighth link member 50 will be described, and the description of the right seventh link member 48 and the right eighth link member 50 will be omitted.

[0035] As shown in FIG. 5, the seventh link member 48 is formed in a plate shape extending in the left-right direction as the thickness direction, and is formed in a shape that slopes forward as it goes downward when viewed from the left side. The upper end portion of the seventh link member 48 is rotatably connected to the lower end portion of the sixth link member 46 with the left-right direction as the axial direction. Further, the lower end portion of the seventh link member 48 is rotatably connected to the upper end portion of the first link member 30 with the left-right direction as the axial direction. Here, the connecting pin 52 that connects the lower end portion of the seventh link member 48 and the upper end portion of the first link member 30 is inserted into a long hole 30D formed in the upper end portion of the first link member 30, whereby the connecting pin 52 can move along the longitudinal direction of the long hole 30D.

[0036] The eighth link member 50 is formed in a plate shape extending in the left-right direction as the thickness direction, and is formed in an elongated shape that inclines forward as it goes downward when viewed from the left side. The upper end portion of the eighth link member 50 is pivotally connected to the lower end portion of the seventh link member 48 via a connecting pin 52 so as to be rotatable about the left-right direction as the axial direction. Further, the lower end portion of the eighth link member 50 is pivotally connected to the rear end portion 22A of the side frame portion 22 together with the fourth connecting portion 32A of the second link member 32 so as to be rotatable about the seat width direction as the axial direction. In FIGS. 5 to 7, the inside of the outer edge of the eighth link member 50 is drawn transparently.

[0037] (Operations and Effects of this Embodiment) Next, the operations and effects of this embodiment will be described.

[0038] As shown in FIGS. 2 to 7, in the vehicle seat 10 of this embodiment, when the actuator 18 operates and the lead screw 18A is displaced so that the distance between the back frame fixing portion 18C and the cushion frame fixing portion 18D of the actuator 18 becomes shorter, the seat back 14 reclines rearward.

[0039] Here, in this embodiment, since the first link member 30, the second link member 32, the third link member 34, and the fourth link member 36 that constitute the reclining portion 16A are configured as described above, the rotation center 38 of the seat back 14 is located on the front side of the lower end portion 26A of the lower side frame portion 26 of the back frame 24 and on the front side of the rear end portion 22A of the side frame portion 22 of the cushion frame 20. By setting the rotation center 38 of the seat back 14 on the hip side of the seated occupant in this way, it is possible to suppress a change in the support position of the occupant's back by the seat back 14 during reclining. That is, it is possible to suppress the seat back 14 from shifting with respect to the occupant's back during reclining.

[0040] When the seat back 14 reclines rearward, the eighth link member 50 constituting the interlocking portion 16C tilts rearward and the connecting pin 52 engaged with the upper end portion of the eighth link member 50 moves along the long hole 30D formed in the first link member 30 to the side opposite to the first connecting portion 30A of the first link member 30. As a result, the seventh link member 48 tilts rearward with respect to the eighth link member 50. When the seventh link member 48 tilts rearward with respect to the eighth link member 50, the sixth link member 46 constituting the middle folding portion 16B tilts rearward with respect to the lower side frame portion 26. As a result, the shaft member 40 to which the sixth link member 46 is fixed rotates counterclockwise with respect to the lower side frame portion 26 in a left side view. Further, when the shaft member 40 rotates counterclockwise, the fifth link member 44 fixed to the shaft member 40 tilts forward. As a result, the upper side frame portion 27 tilts forward with respect to the lower side frame portion 26. As a result, the upper portion 14A of the seat back 14 tilts toward the back side of the seated occupant with respect to the lower portion 14B. When the seat back 14 reclines forward from the second position side toward the first position side, the upper portion 14A of the seat back 14 tilts to the side opposite to the back of the seated occupant with respect to the lower portion 14B. As described above, in the vehicle seat 10 of the present embodiment, it is possible to suppress a change in the support position of the occupant's back during reclining and to adjust the posture of the upper portion 14A with respect to the lower portion 14B of the seat back 14 during reclining.

[0041] In the present embodiment, an example using the actuator 18 having the lead screw 18A linearly displaced in one direction has been described, but the present invention is not limited thereto. For example, an actuator having another configuration may be used, or a configuration in which the actuator itself is not provided may be used.

[0042] In addition, in the present embodiment, an example using the link mechanism 16 having the reclining portion 16A, the middle folding portion 16B, and the interlocking portion 16C configured as described above has been described. However, the present invention is not limited to this. Any configuration that can suppress a change in the support position of the occupant's back during reclining and can adjust the posture of the upper portion 14A with respect to the lower portion 14B of the seat back 14 during reclining may use a mechanism different from the link mechanism 16.

[0043] As described above, one embodiment of the present invention has been described. However, the present invention is not limited to the above, and it goes without saying that various modifications can be made and implemented within the scope without departing from the gist of the present invention.

Explanation of Reference Numerals

[0044] 10 Vehicle seat 12 Seat cushion 14 Seat back 14A Upper portion of the seat back on the seat side 14B Lower portion of the seat back on the seat side 16A Reclining portion 16B Middle folding portion 16C Interlocking portion 26 Lower side frame portion 27 Upper side frame portion 29 Reclining portion side link member 30 First link member 30A First connecting portion 30B Second connecting portion 30C Third connecting portion 32 Second link member 32A Fourth connecting portion 32B Fifth connecting portion 34 Third link member 34A Sixth connecting portion 34B Seventh connecting portion 36 Fourth link member 36A Eighth connecting portion 36B Ninth connecting portion 36C Tenth connecting portion 40 Shaft member 42 Middle bent part side link member 44 Fifth link member 46 Sixth link member 48 Seventh link member 50 Eighth link member

Claims

1. A seat cushion that supports the buttocks of a seated occupant from below the seat, a seat back that supports the back of the seated occupant from behind the seat, a reclining portion that reclines the seat back in the fore-and-aft direction of the seat with respect to the seat cushion about a center of rotation on the front side of the seat with respect to an end portion on the lower side of the seat of the seat back, a middle folding portion that displaces a portion on the upper side of the seat of the seat back with respect to a portion on the lower side of the seat toward the back side of the seated occupant and toward the side opposite to the back of the seated occupant, a linkage portion that interlocks the operation of the reclining portion and the operation of the middle folding portion, and a vehicle seat provided with the same.

2. The reclining portion is configured to include a plurality of reclining portion side link members connected to each other, the middle folding portion is configured to include a plurality of middle folding portion side link members connected to each other, The vehicle seat according to claim 1, wherein a defined reclining portion side link member among the plurality of reclining portion side link members and a defined middle folding portion side link member among the plurality of middle folding portion side link members are connected via the linkage portion.

3. The plurality of reclining portion side link members has a first connecting portion, a second connecting portion, and a third connecting portion, and a first link member in which the first connecting portion is rotatably connected to the seat cushion about the seat width direction as an axial direction; has a fourth connecting portion and a fifth connecting portion, and a second link member in which the fourth connecting portion is rotatably connected to the seat cushion about the seat width direction as an axial direction; has a sixth connecting portion and a seventh connecting portion, in which the sixth connecting portion is rotatably connected to the seat back about the seat width direction as an axial direction, and the seventh connecting portion is rotatably connected to the second connecting portion about the seat width direction as an axial direction, a third link member; has an eighth connecting portion, a ninth connecting portion, and a tenth connecting portion, in which the eighth connecting portion is rotatably connected to the seat back about the seat width direction as an axial direction, the ninth connecting portion is rotatably connected to the fifth connecting portion about the seat width direction as an axial direction, and the tenth connecting portion is rotatably connected to the third connecting portion about the seat width direction as an axial direction, a fourth link member; and is provided with The vehicle seat according to claim 2, wherein the first link member, the second link member, the third link member, and the fourth link member are each displaced, so that the seat back reclines in the front-rear direction of the seat with respect to the seat cushion about a rotation center on the front side of the seat rather than an end portion on the lower side of the seat of the seat back.

4. The seat back includes a lower side frame portion connected to the seat cushion via a plurality of the reclining portion side link members, and an upper side frame portion supported by the lower side frame portion. The middle folding portion includes a shaft member rotatably supported by the lower side frame portion with the seat width direction as an axial direction. The plurality of the middle folding portion side link members include a fifth link member having a part thereof fixed to the shaft member and another part thereof fixed to the upper side frame portion, and a sixth link member having a part thereof fixed to the shaft member. The interlocking portion includes a seventh link member having a part thereof rotatably connected to the sixth link member with the seat width direction as an axial direction and another part thereof rotatably and displaceably connected to the first link member with the seat width direction as an axial direction, and an eighth link member having a part thereof rotatably connected to the seat cushion together with the fourth connecting portion with the seat width direction as an axial direction and another part thereof rotatably and displaceably connected to the seventh link member with the seat width direction as an axial direction and with respect to the first link member. The vehicle seat according to claim 3.

Images