Vehicle seat

Abstract

To suppress a support position of a back of an occupant from changing when reclining.SOLUTION: A vehicle seat 10 includes a seat cushion 12 which supports a hip part of a seating occupant from a seat lower side, a seat back 14 which supports a back part of the seating occupant from a seat rear side, and a first link member 30, a second link member 32, a third link member 34, and a fourth link member 36. When the first link member 30, the second link member 32, the third link member 34, and the fourth link member 36 displace respectively, the seat back 14 is reclined to the seat cushion 12 in a forward / backward direction of the seat around a seat front side, as a rotation center 38, rather than an end part of a seat lower side of the seat back 14.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] The following Patent Document 1 discloses a method for adjusting a vehicle seat that can reduce the change in the support position of the occupant's back when reclining. In the method described in this document, when adjusting the inclination angle of the backrest that supports the back of the occupant seated on the seat cushion, the backrest is rotated around a rotation center defined below the reference rotation center of the occupant when reclining and forward of the end of the backrest on the seat cushion side. Specifically, in one example described in the following Patent Document 1, a link mechanism is provided that changes the position of the rotation axis of the backrest in conjunction with the inclination angle of the backrest, so that the backrest rotates around a rotation center defined forward of the end of the backrest on the seat cushion side. In another example described in the following Patent Document 1, a link mechanism is provided that is configured to slide the backrest frame along the seat back frame in conjunction with the inclination angle of the backrest, so that the backrest rotates around a rotation center defined forward of the end of the backrest on the seat cushion side. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-89401 A Summary of the Invention [Problem to be solved by the invention]

[0004] SUMMARY OF THE PRESENT DISCLOSURE In consideration of the above, an object of the present invention is to provide a vehicle seat that can prevent the support position of the occupant's back from changing when the seat is reclined. [Means for solving the problem]

[0005] A vehicle seat of a first aspect includes a seat cushion that supports the buttocks of a seated occupant from a seat lower side, a seat back that supports the back of the seated occupant from a seat rear side, a first link member having a first connecting portion, a second connecting portion, and a third connecting portion, the first connecting portion being connected to the seat cushion so as to be rotatable with the seat width direction as an axial direction, a second link member having a fourth connecting portion and a fifth connecting portion, the fourth connecting portion being connected to the seat cushion so as to be rotatable with the seat width direction as an axial direction, and a sixth connecting portion and a seventh connecting portion, the sixth connecting portion being connected to the seat back so as to be rotatable with the seat width direction as an axial direction, and the seventh connecting portion being connected to the second connecting portion so as to be rotatable with the seat width direction as an axial direction. and a fourth link member having an eighth connecting portion, a ninth connecting portion and a tenth connecting portion, the eighth connecting portion being rotatably connected to the seat back with the seat width direction as its axial direction, the ninth connecting portion being rotatably connected to the fifth connecting portion with the seat width direction as its axial direction, and the tenth connecting portion being rotatably connected to the third connecting portion with the seat width direction as its axial direction, and wherein, as 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 fore-and-aft direction relative to the seat cushion with a rotation center located on the seat front side rather than the seat lower end of the seat back.

[0006] In the vehicle seat of the first aspect, the seat cushion and the seat back are connected via the first link member, the second link member, the third link member, and the fourth link member having the above-mentioned configuration. As a result, the seat back reclines in the front-rear direction relative to the seat cushion, with the rotation center being located on the front side of the seat rather than the lower end of the seat back. By setting the rotation center of the seat back to be closer to the front side of the seat rather than the lower end of the seat back, i.e., by setting the rotation center of the seat back to the buttocks side of the seated occupant, it is possible to prevent the support position of the occupant's back by the seat back from changing when the seat back is reclined.

[0007] The vehicle seat of the second aspect is the vehicle seat of the first aspect, in which the end portion of the seat cushion on one side in the seat width direction and the end portion of the seat back on one side in the seat width direction are connected via the first link member, the second link member, the third link member and the fourth link member, and the end portion of the seat cushion on the other side in the seat width direction and the end portion of the seat back on the other side in the seat width direction are connected via a hinge member that rotates around the rotation center.

[0008] In the vehicle seat of the second aspect, the end of the seat cushion on one side in the seat width direction and the end of the seat back on one side in the seat width direction are connected via a first link member, a second link member, a third link member, and a fourth link member. Also, the end of the seat cushion on the other side in the seat width direction and the end of the seat back on the other side in the seat width direction are connected via a hinge member that rotates around a rotation center. With this configuration, it is possible to eliminate the need to provide the first link member, the second link member, the third link member, and the fourth link member on both sides in the seat width direction. This makes it possible to suppress an increase in the number of parts of the vehicle seat.

[0009] The vehicle seat of the third aspect is the vehicle seat of the first or second aspect, in which an actuator that displaces linearly in one direction is provided between the seat back and the seat cushion, and when the actuator is activated, the seat back reclines in the fore-and-aft direction relative to the seat cushion.

[0010] In the vehicle seat of the third aspect, the actuator that is displaced linearly in one direction is actuated to recline the seat back in the front-rear direction of the seat relative to the seat cushion. In this configuration, compared to a case where an actuator that is rotationally displaced using a motor and gears is used, it is possible to prevent the structure around the actuator and links (first link member, second link member, third link member, and fourth link member) from becoming complicated. Effect of the Invention

[0011] The vehicle seat according to the present invention has an excellent effect of suppressing a change in the support position of the occupant's back when the seat is reclined. [Brief description of the drawings]

[0012] [Figure 1] 1 is a side view showing a vehicle seat according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a side view showing a schematic view of the link mechanism and the like, illustrating a state in which the seat back is located at a first position. [Diagram 3] FIG. 4 is a side view showing a schematic view of the link mechanism and the like, illustrating a state in which the seat back is located in a second position. [Figure 4] FIG. 2 is a side view showing a schematic view of an actuator and the like. [Diagram 5] FIG. 11 is a side view showing a portion of a vehicle seat according to a second embodiment. [Figure 6] FIG. 11 is a side view showing a link mechanism and the like that constitute a part of the vehicle seat of the third embodiment. [Figure 7] 13 is a perspective view of a link mechanism and the like that constitute a part of a vehicle seat of a third embodiment, as viewed from the left rear side. FIG. [Figure 8] 13 is a perspective view of a link mechanism and the like that constitute a part of a vehicle seat of a third embodiment, as viewed from an obliquely front left side. FIG. [Figure 9] 1 is a perspective view of the seat back bracket and the like as viewed from the left rear side. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] (First embodiment) A vehicle seat 10 according to a first embodiment of the present invention will be described with reference to Figs. 1 to 4. Note that the arrows FR and UP shown in the drawings indicate the front and upper sides of the seat as seen by an occupant seated in the vehicle seat 10, respectively. Hereinafter, when the directions of front-rear, up-down, and left-right are simply used in the description, they refer to front-rear in the front-rear direction of the seat, up-down in the up-down direction of the seat, and left-right in the left-right direction of the seat, unless otherwise specified. The left-right direction of the seat coincides with the seat width direction.

[0014] 1, the vehicle seat 10 includes a seat cushion 12 that supports the buttocks of a seated occupant from below, and a seat back 14 that supports the back of the seated occupant from the rear side. The vehicle seat 10 also includes a link mechanism 16 that connects the seat cushion 12 and the seat back 14, and an actuator 18 (see FIG. 4) that reclines the seat back 14 when actuated.

[0015] The seat cushion 12 includes a cushion frame 20 that constitutes the framework of the seat cushion 12, and a cushion pad (not shown) that is attached to the cushion frame 20. In Fig. 1, a part of the cushion frame 20 is depicted by a two-dot chain line. The cushion frame 20 includes a pair of left and right side frame portions 22 that are spaced apart in the seat width direction and extend in the front-rear direction.

[0016] The seat back 14 includes a back frame 24 that constitutes the framework of the seat back 14, and a back pad (not shown) attached to the back frame 24. In FIG. 1, a part of the back frame 24 is depicted by a two-dot chain line. The back frame 24 includes a pair of left and right side frame portions 26 that are spaced apart in the seat width direction and extend in the vertical direction. Lower end portions 26A of the pair of left and right side frame portions 26 and 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, which will be described later. In FIG. 1, a cover member 28 that covers a part of the link mechanism 16 from the outside in the seat width direction is depicted as transparent.

[0017] The link mechanism 16 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 26A of the left side frame portion 26 of the back frame 24 to the rear end 22A of the left side frame portion 22 of the cushion frame 20. The link mechanism 16 also 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 26A of the right side frame portion 26 of the back frame 24 to the rear end 22A of the right side frame portion 22 of the cushion frame 20. 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, in the following, we will explain 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 will omit explanations 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.

[0018] 1 and 2 respectively show the vehicle seat 10 and the link mechanism 16 in a state where the seat back 14 is located at a first position. When the seat back 14 is located at the first position, the occupant can sit in the vehicle seat 10 in a position where the occupant can see the front. The following description of the first link member 30, the second link member 32, the third link member 34, and the fourth link member 36 will be given on the assumption that the seat back 14 is located at the first position. FIG. 2 and FIG. 3 used in the following description are schematic diagrams showing the link mechanism 16. Therefore, the configurations shown in FIG. 2 and FIG. 3 do not coincide with the configuration shown in FIG. 1 in some details.

[0019] As shown in Fig. 2, the first link member 30 is formed in a plate shape extending with the thickness direction being the left-right direction, and is formed in an elongated shape inclined rearward as it goes upward as viewed from the left side. The lower end of this first link member 30 is a first connecting portion 30A. The upper end of the first link member 30 is a second connecting portion 30B. Furthermore, the middle portion of the first link member 30 in the up-down direction is a third connecting portion 30C. The first connecting portion 30A is connected to the rear end portion 22A of the side frame portion 22 of the cushion frame 20 so as to be rotatable with the seat width direction as the axial direction.

[0020] The second link member 32 is formed in a plate shape extending with the thickness direction being the left-right direction, and is formed in an elongated shape inclined toward the rear as it goes upward when viewed from the left side. The lower end of this second link member 32 is a fourth connecting portion 32A. The upper end of the second link member 32 is a fifth connecting portion 32B. The fourth connecting portion 32A is connected to the rear end portion 22A of the side frame portion 22 of the cushion frame 20 so as to be rotatable with the seat width direction as the axial direction. In a state in which the fourth connecting portion 32A is connected to the rear end portion 22A of the side frame portion 22 of the cushion frame 20 so as to be rotatable with the seat width direction as the axial direction, the fourth connecting portion 32A is located rearward with respect to the first connecting portion 30A of the first link member 30.

[0021] The third link member 34 is formed in a plate shape extending with the thickness direction being the left-right direction, and is formed in an elongated shape with the longitudinal direction being the front-rear direction when viewed from the left side. The front end of this third link member 34 is a sixth connecting portion 34A. The rear end of the third link member 34 is a seventh connecting portion 34B. The sixth connecting portion 34A is connected to the lower end portion 26A of the side frame portion 26 of the back frame 24 so as to be rotatable with the seat width direction as the axial direction. The seventh connecting portion 34B is connected to the second connecting portion 30B of the first link member 30 so as to be rotatable with the seat width direction as the axial direction.

[0022] The fourth link member 36 is formed in a plate shape extending with the thickness direction being the left-right direction, and is formed in an elongated shape with the longitudinal direction being the longitudinal direction when viewed from the left side. The front end of this fourth link member 36 is an eighth connecting portion 36A. The rear end of the fourth link member 36 is a ninth connecting portion 36B. Furthermore, the middle portion of the fourth link member 36 in the longitudinal direction is a tenth connecting portion 36C. The eighth connecting portion 36A is connected to the lower end portion 26A of the side frame portion 26 of the back frame 24 so as to be rotatable with the seat width direction as the axial direction. In a state in which the eighth connecting portion 36A is connected to the lower end portion 26A of the side frame portion 26 of the back frame 24, the eighth connecting portion 36A is located forward and below the sixth connecting portion 34A of the third link member 34, and is located above the first connecting portion 30A of the first link member 30. The ninth connecting portion 36B is connected to the fifth connecting portion 32B of the second link member 32 so as to be rotatable about an axial direction that corresponds to the seat width direction. Furthermore, the tenth connecting portion 36C is connected to the third connecting portion 30C of the first link member 30 so as to be rotatable about an axial direction that corresponds to the seat width direction.

[0023] Moreover, the above-described first link member 30 and second link member 32 are positioned outboard of the third link member 34 and fourth link member 36 in the seat width direction.

[0024] Here, the axial center of the connection portion between the first connecting portion 30A of the first link member 30 and the rear end portion 22A of the side frame portion 22 of the cushion frame 20 will be referred to as the first link axis C1. Moreover, the axial center of the connection portion between the fourth connecting portion 32A of the second link member 32 and the rear end portion 22A of the side frame portion 22 of the cushion frame 20 will be referred to as the second link axis C2. Furthermore, the axial center of the connection portion between the fifth connecting portion 32B of the second link member 32 and the ninth connecting portion 36B of the fourth link member 36 will be referred to as the third link axis C3. Moreover, the axial center of the connection portion between the third connecting portion 30C of the first link member 30 and the tenth connecting portion 36C of the fourth link member 36 will be referred to as the fourth link axis C4. The axial center of the connection portion between the second connecting portion 30B of the first link member 30 and the seventh connecting portion 34B of the third link member 34 will be referred to as the fifth link axis C5. The axial center of the connection portion between the sixth connecting portion 34A of the third link member 34 and the lower end portion 26A of the side frame portion 26 of the back frame 24 will be referred to as the sixth link axis C6. The axial center of the connection portion between the eighth connecting portion 36A of the fourth link member 36 and the lower end portion 26A of the side frame portion 26 of the back frame 24 will be referred to as the seventh link axis C7.

[0025] When viewed from the left side, the length of the line L1 connecting the first link shaft C1 and the fourth link shaft C4 and the length of the line L2 connecting the second link shaft C2 and the third link shaft C3 are the same, and the lines L1 and L2 are parallel to each other. When viewed from the left side, the length of the line L3 connecting the first link shaft C1 and the second link shaft C2 and the length of the line L4 connecting the fourth link shaft C4 and the third link shaft C3 are the same, and the lines L3 and L4 are parallel to each other. Furthermore, the length of the lines L1 and L2 is longer than the length of the lines L3 and L4. As a result, when viewed from the left side, a parallelogram is formed by the lines L1, L2, L3, and L4. The length of the lines L1 and L2 may be set to be the same as the length of the lines L3 and L4. The length of the lines L1 and L2 may be set to be shorter than the length of the lines L3 and L4.

[0026] Also, when viewed from the left side, the length of the line L5 connecting the seventh link shaft C7 and the sixth link shaft C6 is the same as the length of the line L6 connecting the fourth link shaft C4 and the fifth link shaft C5, and the lines L5 and L6 are parallel to each other. Also, when viewed from the left side, the length of the line L7 connecting the seventh link shaft C7 and the fourth link shaft C4 is the same as the length of the line L8 connecting the sixth link shaft C6 and the fifth link shaft C5, and the lines L7 and L8 are parallel to each other. Furthermore, the length of the lines L5 and L6 is longer than the length of the lines L7 and L8 and shorter than the length of the lines L1 and L2. Also, the length of the lines L7 and L8 is shorter than the length of the lines L3 and L4. The length of the lines L5 and L6 may be set to be the same as the length of the lines L7 and L8. The length of the lines L5 and L6 may be set to be shorter than the length of the lines L7 and L8.

[0027] As shown in Figures 1 and 2, by setting the first link member 30, the second link member 32, the third link member 34 and the fourth link member 36 that constitute the link mechanism 16 as described above, the rotation center 38 of the seat back 14 is located forward of the lower end portion 26A of the side frame portion 26 of the back frame 24 and forward of the rear end portion 22A of the side frame portion 22 of the cushion frame 20.

[0028] As shown in FIG. 4, the actuator 18 provided between the seat back 14 and the seat cushion 12 is an actuator having a lead screw 18A that displaces linearly in one direction. The actuator 18 includes the lead screw 18A and an actuator body 18B that displaces the lead screw 18A linearly in one direction. The actuator 18 also includes a back frame fixing portion 18C that is integrally formed with the actuator body 18B, and a cushion frame fixing portion 18D that is provided at the end of the lead screw 18A opposite to the actuator body 18B. As shown in FIG. 1 and FIG. 4, the actuator 18 is disposed between a pair of left and right 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 directly or indirectly to the back frame 24. The cushion frame fixing portion 18D of the actuator 18 is fixed directly or indirectly to the cushion frame 20. When the seat back 14 is in the first position, the axial direction of the lead screw 18A of the actuator 18 is oriented in the vertical direction. It is.

[0029] (Actions and Effects of the Present Embodiment) Next, the operation and effects of this embodiment will be described.

[0030] 1 to 4, in the vehicle seat 10 of this embodiment, when the actuator 18 is actuated to displace the lead screw 18A so that the distance between the back frame fixing portion 18C of the actuator 18 and the cushion frame fixing portion 18D is shortened, the seat back 14 is reclined rearward. Note that FIG. 3 shows the link mechanism 16 in a state where the seat back 14 is in a second position (a position reclined rearward from the first position). When the seat back 14 is in the second position, for example, the occupant can take a nap in a position supported from the rear and lower sides by the seat back 14.

[0031] Here, in this embodiment, the first link member 30, the second link member 32, the third link member 34, and the fourth link member 36 constituting the link mechanism 16 are set as described above, so that the rotation center 38 of the seat back 14 is located forward of the lower end 26A of the side frame portion 26 of the back frame 24 and forward of the rear end 22A of the side frame portion 22 of the cushion frame 20. In this way, by setting the rotation center 38 of the seat back 14 on the buttocks side of the seated occupant, it is possible to suppress the support position of the occupant's back by the seat back 14 from changing when reclining. In other words, it is possible to suppress the seat back 14 from shifting relative to the occupant's back when reclining.

[0032] In this embodiment, the seat back 14 reclines in the front-rear direction relative to the seat cushion 12 by operating the actuator 18 having a lead screw 18A that is linearly displaced in one direction. In this configuration, compared to a case where an actuator configured to rotate and displace using a motor and gears is used, it is possible to prevent the structure around the actuator 18 and the link mechanism 16 (the first link member 30, the second link member 32, the third link member 34, and the fourth link member 36) from becoming complicated.

[0033] In this embodiment, an example is described in which the actuator 18 has a lead screw 18A that is displaced linearly in one direction, but the present invention is not limited to this. For example, an actuator of another configuration may be used, or an actuator may not be provided at all.

[0034] In the present embodiment, the first link member 30, the second link member 32, the third link member 34, and the fourth link member 36 are provided on the left and right sides of the seat cushion 12 and the seat back 14, respectively, but the present invention is not limited thereto. For example, as in a vehicle seat 40 of a second embodiment shown in FIG. 5, the first link member 30, the second link member 32, the third link member 34, and the fourth link member 36 may be provided only on the left side of the seat cushion 12 and the seat back 14, and the first link member 30, the second link member 32, the third link member 34, and the fourth link member 36 may not be provided on the right side of the seat cushion 12 and the seat back 14. Also, the first link member 30, the second link member 32, the third link member 34, and the fourth link member 36 may be provided only on the right side of the seat cushion 12 and the seat back 14, and the first link member 30, the second link member 32, the third link member 34, and the fourth link member 36 may not be provided on the left side of the seat cushion 12 and the seat back 14.

[0035] In the vehicle seat 40 shown in FIG. 5, a portion of the right side frame portion 22 of the cushion frame 20 corresponding to the pivot center 38 and a right side frame portion of the back frame 24 are The lower end of the arm portion 26 is connected via a hinge member 42. The hinge member 42 is rotatable around a rotation center 38. With this configuration, it is possible to eliminate the need to provide the first link member 30, the second link member 32, the third link member 34, and the fourth link member 36 on both sides in the seat width direction. This makes it possible to suppress an increase in the number of parts of the vehicle seat 40. Note that the same reference numerals are used to denote the parts and portions of the vehicle seat 40 that correspond to the above-mentioned vehicle seat 10.

[0036] Third embodiment Next, a vehicle seat according to a third embodiment will be described. In the vehicle seat according to the third embodiment, the members and parts corresponding to those of the vehicle seat 10 described above will be denoted by the same reference numerals as those of the vehicle seat 10 described above, and the description thereof may be omitted.

[0037] 6 to 8 show a link mechanism 16 and the like that constitute a part of the vehicle seat of this embodiment. As shown in these drawings, in this embodiment, a first link member 30, a second link member 32, a third link member 34, and a fourth link member 36 are configured to be suspended between a bracket 44 on the cushion frame side and a bracket 46 on the back frame side.

[0038] The cushion frame side bracket 44 includes a cushion frame connecting portion 44A extending with the seat width direction as its thickness direction, and a flange portion 44B protruding outward in the seat width direction from a front end portion of the cushion frame connecting portion 44A. The cushion frame connecting portion 44A is fixed to the side frame portion 22 (see FIG. 2) via a fastening member.

[0039] As shown in FIG. 9, the back frame side bracket 46 includes a back frame connecting portion 46A extending with the seat width direction as the thickness direction, an inclined portion 46B extending from the front end of the back frame connecting portion 46A at an incline toward the outside in the seat width direction as it moves forward, and a link connecting portion 46C extending toward the front from the tip of the inclined portion 46B. The back frame connecting portion 46A is offset toward the inside in the seat width direction with respect to the link connecting portion 46C. In addition, a plurality of weld nuts 48 are fixed by welding to the surface of the back frame connecting portion 46A on the outside in the seat width direction. The back frame connecting portion 46A is fixed to the side frame portion 26 (see FIG. 2) by screwing a plurality of bolts into the plurality of weld nuts 48.

[0040] 6 to 8, the first link member 30 is located outboard in the seat width direction relative to the third link member 34, the fourth link member 36, the cushion frame connecting portion 44A of the cushion frame side bracket 44, and the back frame side bracket 46. The first connecting portion 30A of the first link member 30 is connected to the cushion frame connecting portion 44A at a position rearward of and adjacent to the flange portion 44B so as to be rotatable with the seat width direction as its axial direction.

[0041] The second link member 32 is located on the inner side in the seat width direction relative to the first link member 30, the third link member 34, the fourth link member 36, and the cushion frame connecting portion 44A of the cushion frame side bracket 44, and is located on the outer side in the seat width direction relative to the back frame connecting portion 46A of the back frame side bracket 46. The fourth connecting portion 32A of this second link 32 is connected to the cushion frame connecting portion 44A to be rotatable with the seat width direction as its axial direction.

[0042] The third link member 34 is located on the seat width direction outer side with respect to the back frame side bracket 46. The sixth connecting portion 34A of the third link member 34 is connected to a link connecting portion 46C so as to be rotatable with the seat width direction as an axial direction.

[0043] The fourth link member 36 is located on the seat width direction outer side with respect to the back frame side bracket 46. The seventh connecting portion 36A of the fourth link member 36 is connected to a link connecting portion 46C so as to be rotatable with the seat width direction as an axial direction.

[0044] Here, the connecting member 50 connecting the sixth connecting portion 34A of the third link member 34 to the link connection portion 46C and the connecting member 50 connecting the seventh connecting portion 36A of the fourth link member 36 to the link connection portion 46C are provided with a spacer portion 50A to ensure clearance in the seat width direction between the third link member 34 and the fourth link member 36 and the link connection portion 46C.

[0045] In addition, two recesses 30D recessed toward the rear side are formed in the front end of the first link member 30. The two recesses 30D are arranged with a gap in the up-down direction. The upper recess 30D is located on an extension line of the movement locus of a part (end 50B on the outer side in the seat width direction) of the connecting member 50 that connects the sixth connecting portion 34A of the third link member 34 to the link connecting portion 46C. In addition, the lower recess 30D is located on an extension line of the movement locus of a part (end 50B on the outer side in the seat width direction) of the connecting member 50 that connects the seventh connecting portion 36A of the fourth link member 36 to the link connecting portion 46C.

[0046] (Actions and Effects of the Present Embodiment) Next, the operation and effects of this embodiment will be described.

[0047] In the embodiment described above, when the seat back 14 (see FIG. 1) is reclined rearward, the end 50B of the connecting member 50 connecting the sixth connecting portion 34A of the third link member 34 to the link connecting portion 46C and the end 50B of the connecting member 50 connecting the seventh connecting portion 36A of the fourth link member 36 to the link connecting portion 46C are each positioned within the two recesses 30D of the first link member 30. In this configuration, the seat back 14 (see FIG. 1) can be reclined further rearward compared to a configuration in which the two recesses 30D are not formed in the first link member 30.

[0048] In this embodiment, the connecting member 50 connecting the sixth connecting portion 34A of the third link member 34 to the link connecting portion 46C and the connecting member 50 connecting the seventh connecting portion 36A of the fourth link member 36 to the link connecting portion 46C are provided with spacer portions 50A for ensuring clearances in the seat width direction between the third link member 34 and the link connecting portion 46C and between the third link member 34 and the fourth link member 36 and the link connecting portion 46C. This makes it possible to prevent the third link member 34 and the fourth link member 36 from contacting the link connecting portion 46C when reclining the seat back 14 (see FIG. 1).

[0049] In this embodiment, when the seat back 14 (see FIG. 1) is reclined forward, the front end of the first link member 30 comes into contact with the flange portion 44B of the cushion frame side bracket 44. This makes it possible to limit the reclining range of the seat back 14 (see FIG. 1) forward.

[0050] 7 and 9, in the back frame side bracket 46 of this embodiment, the back frame connecting portion 46A is offset inward in the seat width direction relative to the link connecting portion 46C. With this configuration, it is possible to prevent the first link member 30, the second link member 32, the third link member 34, and the fourth link member 36 from contacting the weld nut 48 fixed to the back frame connecting portion 46A.

[0051] Incidentally, the cushion frame side bracket 44 may be covered from the outer side in the seat width direction by a side finisher. Here, in this embodiment, the second link member 32 is located on the inner side in the seat width direction with respect to the cushion frame connecting portion 44A of the cushion frame side bracket 44. In this configuration, compared to a configuration in which the second link member 32 is located on the outer side in the seat width direction with respect to the cushion frame connecting portion 44A of the cushion frame side bracket 44, it is possible to prevent the second link member 32 from coming into contact with the side finisher.

[0052] Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and it is of course possible to implement the present invention in various other modified forms without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0053] 10 Vehicle seats 12 Seat cushion 14 Seat back 18 Actuators 30 First link member 30A 1st connection part 30B 2nd connection part 30C 3rd connection part 30D recess 32 Second link member 32A 4th connection part 32B 5th connection part 34 Third link member 34A 6th connection section 34B 7th connection part 36 Fourth link member 36A 8th connection section 36B 9th connection section 36C 10th connection section 38 Rotation Center 40 Vehicle seats 42 Hinge member 50 Connecting member 50B End of connecting member (part of connecting 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 a seated occupant from the rear side of the seat; a first link member having a first connecting portion, a second connecting portion, and a third connecting portion, the first connecting portion being connected to the seat cushion so as to be rotatable about an axial direction of the seat width direction; a second link member having a fourth connecting portion and a fifth connecting portion, the fourth connecting portion being connected to the seat cushion so as to be rotatable about an axial direction of the seat width direction; a third link member having a sixth connecting portion and a seventh connecting portion, the sixth connecting portion being connected to the seat back so as to be rotatable about an axial direction of the seat width direction, and the seventh connecting portion being connected to the second connecting portion so as to be rotatable about an axial direction of the seat width direction; a fourth link member having an eighth connecting portion, a ninth connecting portion, and a tenth connecting portion, the eighth connecting portion being connected to the seat back so as to be rotatable about the seat width direction as an axial direction, the ninth connecting portion being connected to the fifth connecting portion so as to be rotatable about the seat width direction as an axial direction, and the tenth connecting portion being connected to the third connecting portion so as to be rotatable about the seat width direction as an axial direction; Equipped with A vehicle seat in which the seat back reclines in the fore-and-aft direction relative to the seat cushion, with a rotation center located forward of the seat lower end of the seat back as a result of the first link member, the second link member, the third link member and the fourth link member each being displaced.

2. an end portion of the seat cushion on one side in a seat width direction and an end portion of the seat back on one side in a seat width direction are connected via the first link member, the second link member, the third link member, and the fourth link member, 2. The vehicle seat according to claim 1, wherein the other end of the seat cushion in the seat width direction and the other end of the seat back in the seat width direction are connected via a hinge member that rotates about the rotation center.

3. an actuator that is displaced linearly in one direction is provided between the seat back and the seat cushion; 3. The vehicle seat according to claim 1, wherein the seat back is reclined in a front-rear direction of the seat relative to the seat cushion by actuation of the actuator.

4. The first link member is formed with two recesses recessed toward the rear side, one recess is located on an extension of a movement trajectory of a part of a connecting member that connects the sixth connecting portion, The vehicle seat according to claim 1 , wherein the other recess is positioned on an extension of a movement path of a part of a connecting member that connects the seventh connecting parts.

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