Vehicle seat

Abstract

To suppress inclination of a rotation part in a vehicle seat apparatus comprising a rotation device.SOLUTION: A vehicle seat 1 comprises: a seat body 3 comprising a seat cushion 7; and a rotation device 2 provided between a floor 5 and the seat cushion, for supporting the seat cushion in a rotatable manner around a rotation axis A extending in a vertical direction as a center. The rotation device comprises: a base part 41; and a rotation part 42 supported on the base part in a rotatable manner around the rotation axis as a center. Between an outer peripheral part of the base part and an outer peripheral part of the rotation part, there are provided: a plurality of spacer parts 171 for inhibiting the rotation part from approaching the base part; and a plurality of energization parts 172 for energizing the rotation part toward the base part. The plurality of spacer parts and the plurality of energization parts are disposed on a virtual circle C with the rotation axis as a center.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Patent Document 1 discloses a vehicle seat that can rotate around a vertical axis relative to a floor. The vehicle seat has a rotation device provided between a floor and a seat cushion. The rotation device has a base portion provided on the floor side, and a rotation portion rotatably supported by the base portion and coupled to the seat cushion. An annular thrust bearing is disposed between the base portion and the rotation portion, with the rotation axis being the center. In addition, a separation suppression portion is provided on the outer side of the thrust bearing to suppress separation of the rotation portion from the base portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] U.S. Patent Publication No. 2020 / 0317091A1 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the peeling prevention part cannot resist the force in the direction in which the base part and the rotating part approach each other. Therefore, when a downward load is applied to the outer periphery of the rotating part, the outer periphery of the rotating part deforms and displaces downward, causing the seat cushion to tilt. In addition, the deformation of the rotating part hinders the smooth rotation of the rotating part.

[0005] In view of the above background, an object of the present invention is to suppress inclination of a rotation portion in a vehicle seat assembly having a rotation device. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, one aspect of the present invention is a vehicle seat (1), comprising: a seat body (3) having a seat cushion (7); and a rotation device (2) provided between a floor (5) and the seat cushion and supporting the seat cushion rotatably about a rotation axis (A) extending in the vertical direction, the rotation device having a base portion (41) and a rotation portion (42) supported on the base portion rotatably about the rotation axis, and between an outer periphery of the base portion and an outer periphery of the rotation portion, a plurality of spacer portions (171) that suppress the approach of the rotation portion to the base portion and a plurality of biasing portions (172) that bias the rotation portion toward the base portion are provided, and the plurality of spacer portions and the plurality of biasing portions are arranged on a virtual circle (C) centered on the rotation axis.

[0007] According to this aspect, since the plurality of spacer portions and the plurality of biasing portions are provided between the outer periphery of the base portion and the outer periphery of the rotating portion, the distance between the base portion and the rotating portion is maintained. This makes it possible to suppress tilting of the rotating portion in a vehicle seat device having a rotation device. In addition, since the plurality of spacer portions and the plurality of biasing portions are arranged on a virtual circle centered on the rotation axis, the rotating portion can be supported in a balanced manner with respect to the base portion, and the plurality of spacer portions and the plurality of biasing portions can be arranged compactly.

[0008] In the above aspect, a plurality of support brackets (176) may be provided on the base portion, and each of the plurality of support brackets may be provided with at least one of the spacer portion and at least one of the biasing portion.

[0009] According to this aspect, the spacer portion and the urging portion can be unitized, which facilitates the installation work.

[0010] In the above-described aspect, a peeling prevention portion (170) is provided between the outer periphery of the base portion and the outer periphery of the rotating portion, and the peeling prevention portion may have a lower hook (182) protruding upward from the edge of the support bracket, and an upper hook (186) protruding downward from the rotating portion and facing the lower hook from below via a gap.

[0011] According to this aspect, even when a large load is applied to the seat body during a vehicle collision, for example, the peeling-off suppression portion suppresses inclination of the rotating portion relative to the base portion.

[0012] In the above aspect, the lower hook may be disposed outside the imaginary circle, and one of the spacer portion and the urging portion may be disposed on a radial line extending from the rotation axis to the lower hook.

[0013] According to this aspect, the spacer portion, the biasing portion, and the peeling suppression portion can be arranged compactly.

[0014] In the above aspect, in each of the support brackets, one of the urging portions may be disposed between two of the spacer portions.

[0015] According to this aspect, the rotating portion is biased downward by the biasing portion and comes into contact with the two rollers, so that tilt of the rotating portion can be suppressed.

[0016] In the above aspect, the base portion is supported on the floor via left and right sliding devices (4), the base portion has a lower bracket (46) connected to the left and right sliding devices and a base plate (47) supported by the lower bracket, the rotating portion has a rotating plate (56) rotatably supported on the base plate and an upper bracket (57) connected to the rotating plate, the upper bracket is connected to an upper surface of the rotating plate and is also connected to the seat body, the multiple spacer portions and the multiple biasing portions are arranged between the lower bracket and the upper bracket, and the rotating plate is arranged below an upper end of the support bracket and above a lower end of the support bracket.

[0017] According to this aspect, the sliding device and the rotating device can be formed compactly.

[0018] In the above aspect, when viewed from above, each of the support brackets may overlap with one of the left and right sliding devices, and a portion of the rotating plate may be positioned below the upper ends of the left and right sliding devices.

[0019] According to this aspect, the sliding device and the rotating device can be formed compactly.

[0020] In the above aspect, the biasing portion may have a locking piece (172A) protruding downward from the rotating portion, a support (172B) protruding upward from the base portion, a contact piece (172C) supported on the support so as to be movable in the vertical direction and abutting the locking piece from above, and a biasing member (172D) provided between the support and the abutment piece for biasing the abutment piece downward.

[0021] According to this aspect, the rotating portion, which is rotatable relative to the fixed portion, can be biased toward the fixed portion.

[0022] In the above aspect, the spacer portion may have a roller (171B) rotatably supported by the support bracket, and the roller may abut against the rotating portion.

[0023] According to this aspect, it is possible to reduce the frictional resistance between the spacer portion and the rotating portion caused by the rotation of the rotating portion.

[0024] In the above aspect, a portion of the spacer portion may be disposed below an upper end of the lower hook and above a lower end of the upper hook.

[0025] According to this aspect, the spacer portion and the peeling prevention portion can be disposed in a well-balanced manner.

[0026] In the above aspect, the seat body has a seat back (8) provided at the rear of the seat cushion via a reclining device (35) and a headrest (9) provided at an upper part of the seat back, and the reclining device may be capable of arbitrarily adjusting the inclination angle of the seat back relative to the seat cushion.

[0027] According to this aspect, the seat body having the seat cushion, the seat back, the headrest, and the reclining device is rotatably supported by the rotating device.

[0028] Another aspect of the present invention is a vehicle seat (1) comprising: a seat body (3) having a seat cushion (7); and a rotation device (2) provided between a floor (5) and the seat cushion and supporting the seat cushion rotatably about a rotation axis (A) extending in the vertical direction, the rotation device having a base portion (41), a rotating portion (42) supported on the base portion rotatably about the rotation axis, and a bearing (63) provided between the base portion and the rotating portion, and between an outer periphery of the base portion and an outer periphery of the rotating portion are provided a plurality of spacer portions (171) that suppress the approach of the rotating portion to the base portion, and a biasing portion (172) that biases the rotating portion toward the base portion, the bearing being a thrust bearing formed in an annular shape centered on the rotation axis, and the plurality of spacer portions being arranged outward of the bearing in the radial direction centered on the rotation axis.

[0029] According to this aspect, since the spacer portion is disposed outward from the bearing, the distance between the outer periphery of the base portion and the outer periphery of the rotating portion is maintained. This makes it possible to suppress tilting of the rotating portion in a vehicle seat device having a rotating device. In addition, the load applied to the bearing is reduced by the multiple spacer portions. This makes it difficult for indentations caused by the bearing to be formed on the rotating portion and the base portion.

[0030] In the above aspect, a peeling suppression portion (170) is provided between the outer periphery of the base portion and the outer periphery of the rotating portion, and the peeling suppression portion has a lower hook (182) protruding upward from the base portion and an upper hook (186) protruding downward from the rotating portion and facing the lower hook from below via a gap, and the peeling suppression portion may be positioned outward from the spacer portion in the radial direction centered on the rotation axis.

[0031] According to this aspect, even when a large load is applied to the seat body during a vehicle collision or the like, tilt of the rotating portion with respect to the base portion can be suppressed.

[0032] In the above aspect, at least one of the plurality of spacer portions and the lower hook may be disposed on a radial line centered on the rotation axis.

[0033] According to this aspect, the spacer portion and the lower hook can be arranged compactly.

[0034] In the above aspect, a lower cover may be attached to an edge portion of the base portion, and the plurality of spacer portions may be disposed closer to the rotation axis than the lower cover.

[0035] According to this aspect, the spacer portion can be hidden by the lower cover.

[0036] Another aspect of the present invention is a vehicle seat (1), comprising: a seat body (3) having a seat cushion (7); and a rotation device (2) provided between a floor (5) and the seat cushion, supporting the seat cushion rotatably about a rotation axis (A) extending in a vertical direction, the rotation device having a base portion (41) and a rotation portion (42) supported on the base portion rotatably about the rotation axis, a plurality of spacer portions (171) are provided between an outer periphery of the base portion and an outer periphery of the rotation portion to suppress the approach of the rotation portion to the base portion, and a front portion (172) is provided between the outer periphery of the base portion and the outer periphery of the rotation portion. and a biasing portion (172) that biases the rotating portion toward the base portion, the spacer portion is provided on the base portion and has a plurality of support shaft portions (171A) extending radially centered on the rotation axis, and a plurality of rollers (171B) rotatably supported on each of the plurality of support shaft portions, the outer peripheral surfaces of the plurality of rollers are formed into a tapered surface whose diameter increases radially outwardly centered on the rotation axis, the rotating portion has an inclined surface (188) that inclines upwardly radially outwardly centered on the rotation axis, and the plurality of rollers abut against the inclined surface.

[0037] According to this aspect, the rollers can support not only the vertical load applied from the rotating part, but also the radial load centered on the rotation axis, thereby suppressing the horizontal positional deviation of the rotating part relative to the fixed part.

[0038] In the above aspect, the plurality of support shaft portions may be provided with biasing members (172D) that bias the corresponding rollers inward in the radial direction centered on the rotation axis.

[0039] According to this aspect, the plurality of rollers can be brought into contact with the inclined surface.

[0040] In the above aspect, the plurality of support shaft portions may be supported by a plurality of support brackets provided on the base portion.

[0041] According to this aspect, the roller, the support shaft, and the support bracket can be unitized, which makes it easier to attach the roller to the base.

[0042] In the above aspect, each of the multiple support brackets may have an inner wall (171C) that supports an inner end of the support shaft portion in a radial direction centered on the rotation axis of the support shaft portion, and an outer wall (171D) that supports an outer end of the support shaft portion in a radial direction centered on the rotation axis of the support shaft portion.

[0043] According to this aspect, the support shaft portion can be supported with good stability.

[0044] In the above aspect, the plurality of biasing members may be coil springs arranged on outer peripheries of the corresponding support shaft portions.

[0045] According to this aspect, the mounting structure of the urging member can be simplified.

[0046] In the above aspect, each of the multiple rollers has a recess (171F) at its end radially outwardly from the rotation axis centered on the rotation axis that is recessed toward the rotation axis, and each end of the multiple urging members may be received in the corresponding recess.

[0047] According to this aspect, the positional deviation of the urging member with respect to the roller is suppressed.

[0048] In the above aspect, the upper end of the inner wall may be located below the upper edge of the inner end in a radial direction centered on the rotation axis of the roller, and the upper end of the outer wall may be located below the upper edge of the outer end in a radial direction centered on the rotation axis of the roller.

[0049] According to this aspect, the inner wall and the outer wall are prevented from coming into contact with the rotating portion.

[0050] In the above aspect, an annular bearing (63) centered on the rotation axis may be provided between the base portion and the rotating portion, and the plurality of rollers may be disposed outward from the bearing.

[0051] According to this aspect, since the plurality of rollers are disposed outward from the bearings, a distance is maintained between the outer periphery of the base portion and the outer periphery of the rotating portion, thereby making it possible to suppress tilting of the rotating portion.

[0052] In the above aspect, a peeling suppression portion (170) is provided between the outer periphery of the base portion and the outer periphery of the rotating portion, and the peeling suppression portion has a lower hook (182) protruding upward from the base portion and an upper hook (186) protruding downward from the rotating portion and facing the lower hook from below via a gap, and the peeling suppression portion may be positioned outward from the roller in the radial direction centered on the rotation axis.

[0053] According to this aspect, even when a large load is applied to the seat body during a vehicle collision or the like, tilt of the rotating part relative to the fixed part can be suppressed.

[0054] In the above aspect, the biasing portion may be disposed inwardly of the separation suppression portion in a radial direction centered on the rotation axis.

[0055] According to this aspect, the biasing portion can be arranged compactly. Effect of the Invention

[0056] In order to solve the above-mentioned problems, one aspect of the present invention is a vehicle seat (1), comprising: a seat body (3) having a seat cushion (7); and a rotation device (2) provided between a floor (5) and the seat cushion and supporting the seat cushion rotatably about a rotation axis (A) extending in the vertical direction, the rotation device having a base portion (41) and a rotation portion (42) supported on the base portion rotatably about the rotation axis, and between an outer periphery of the base portion and an outer periphery of the rotation portion, a plurality of spacer portions (171) that suppress the approach of the rotation portion to the base portion and a plurality of biasing portions (172) that bias the rotation portion toward the base portion are provided, and the plurality of spacer portions and the plurality of biasing portions are arranged on a virtual circle (C) centered on the rotation axis.

[0057] According to this aspect, since the plurality of spacer portions and the plurality of biasing portions are provided between the outer periphery of the base portion and the outer periphery of the rotating portion, the distance between the base portion and the rotating portion is maintained. This makes it possible to suppress tilting of the rotating portion in a vehicle seat device having a rotation device. In addition, since the plurality of spacer portions and the plurality of biasing portions are arranged on a virtual circle centered on the rotation axis, the rotating portion can be supported in a balanced manner with respect to the base portion, and the plurality of spacer portions and the plurality of biasing portions can be arranged compactly.

[0058] In the above aspect, a plurality of support brackets (176) may be provided on the base portion, and each of the plurality of support brackets may be provided with at least one of the spacer portion and at least one of the biasing portion.

[0059] According to this aspect, the spacer portion and the urging portion can be unitized, which facilitates the installation work.

[0060] In the above-described aspect, a peeling prevention portion (170) is provided between the outer periphery of the base portion and the outer periphery of the rotating portion, and the peeling prevention portion may have a lower hook (182) protruding upward from the edge of the support bracket, and an upper hook (186) protruding downward from the rotating portion and facing the lower hook from below via a gap.

[0061] According to this aspect, even when a large load is applied to the seat body during a vehicle collision, for example, the peeling-off suppression portion suppresses inclination of the rotating portion relative to the base portion.

[0062] In the above aspect, the lower hook may be disposed outside the imaginary circle, and one of the spacer portion and the urging portion may be disposed on a radial line extending from the rotation axis to the lower hook.

[0063] According to this aspect, the spacer portion, the biasing portion, and the peeling suppression portion can be arranged compactly.

[0064] In the above aspect, in each of the support brackets, one of the urging portions may be disposed between two of the spacer portions.

[0065] According to this aspect, the rotating portion is biased downward by the biasing portion and comes into contact with the two rollers, so that tilt of the rotating portion can be suppressed.

[0066] In the above aspect, the base portion is supported on the floor via left and right sliding devices (4), the base portion has a lower bracket (46) connected to the left and right sliding devices and a base plate (47) supported by the lower bracket, the rotating portion has a rotating plate (56) rotatably supported on the base plate and an upper bracket (57) connected to the rotating plate, the upper bracket is connected to an upper surface of the rotating plate and is also connected to the seat body, the multiple spacer portions and the multiple biasing portions are arranged between the lower bracket and the upper bracket, and the rotating plate is arranged below an upper end of the support bracket and above a lower end of the support bracket.

[0067] According to this aspect, the sliding device and the rotating device can be formed compactly.

[0068] In the above aspect, when viewed from above, each of the support brackets may overlap with one of the left and right sliding devices, and a portion of the rotating plate may be positioned lower than the upper ends of the left and right sliding devices.

[0069] According to this aspect, the sliding device and the rotating device can be formed compactly.

[0070] In the above aspect, the biasing portion may have a locking piece (172A) protruding downward from the rotating portion, a support (172B) protruding upward from the base portion, a contact piece (172C) supported on the support so as to be movable in the vertical direction and abutting the locking piece from above, and a biasing member (172D) provided between the support and the abutment piece for biasing the abutment piece downward.

[0071] According to this aspect, the rotating portion, which is rotatable relative to the fixed portion, can be biased toward the fixed portion.

[0072] In the above aspect, the spacer portion may have a roller (171B) rotatably supported by the support bracket, and the roller may abut against the rotating portion.

[0073] According to this aspect, it is possible to reduce the frictional resistance between the spacer portion and the rotating portion caused by the rotation of the rotating portion.

[0074] In the above aspect, a portion of the spacer portion may be disposed below an upper end of the lower hook and above a lower end of the upper hook.

[0075] According to this aspect, the spacer portion and the peeling prevention portion can be disposed in a well-balanced manner.

[0076] In the above aspect, the seat body has a seat back (8) provided at the rear of the seat cushion via a reclining device (35) and a headrest (9) provided at an upper part of the seat back, and the reclining device may be capable of arbitrarily adjusting the inclination angle of the seat back relative to the seat cushion.

[0077] According to this aspect, the seat body having the seat cushion, the seat back, the headrest, and the reclining device is rotatably supported by the rotating device.

[0078] Another aspect of the present invention is a vehicle seat (1) comprising: a seat body (3) having a seat cushion (7); and a rotation device (2) provided between a floor (5) and the seat cushion and supporting the seat cushion rotatably about a rotation axis (A) extending in the vertical direction, the rotation device having a base portion (41), a rotating portion (42) supported on the base portion rotatably about the rotation axis, and a bearing (63) provided between the base portion and the rotating portion, and between an outer periphery of the base portion and an outer periphery of the rotating portion are provided a plurality of spacer portions (171) that suppress the approach of the rotating portion to the base portion, and a biasing portion (172) that biases the rotating portion toward the base portion, the bearing being a thrust bearing formed in an annular shape centered on the rotation axis, and the plurality of spacer portions being arranged outward of the bearing in the radial direction centered on the rotation axis.

[0079] According to this aspect, since the spacer portion is disposed outward from the bearing, the distance between the outer periphery of the base portion and the outer periphery of the rotating portion is maintained. This makes it possible to suppress tilting of the rotating portion in a vehicle seat device having a rotating device. In addition, the load applied to the bearing is reduced by the multiple spacer portions. This makes it difficult for indentations caused by the bearing to be formed on the rotating portion and the base portion.

[0080] In the above aspect, a peeling suppression portion (170) is provided between the outer periphery of the base portion and the outer periphery of the rotating portion, and the peeling suppression portion has a lower hook (182) protruding upward from the base portion and an upper hook (186) protruding downward from the rotating portion and facing the lower hook from below via a gap, and the peeling suppression portion may be positioned outward from the spacer portion in the radial direction centered on the rotation axis.

[0081] According to this aspect, even when a large load is applied to the seat body during a vehicle collision or the like, tilt of the rotating portion with respect to the base portion can be suppressed.

[0082] In the above aspect, at least one of the plurality of spacer portions and the lower hook may be disposed on a radial line centered on the rotation axis.

[0083] According to this aspect, the spacer portion and the lower hook can be arranged compactly.

[0084] In the above aspect, a lower cover may be attached to an edge portion of the base portion, and the plurality of spacer portions may be disposed closer to the rotation axis than the lower cover.

[0085] According to this aspect, the spacer portion can be hidden by the lower cover.

[0086] Another aspect of the present invention is a vehicle seat (1), comprising: a seat body (3) having a seat cushion (7); and a rotation device (2) provided between a floor (5) and the seat cushion, supporting the seat cushion rotatably about a rotation axis (A) extending in a vertical direction, the rotation device having a base portion (41) and a rotation portion (42) supported on the base portion rotatably about the rotation axis, a plurality of spacer portions (171) are provided between an outer periphery of the base portion and an outer periphery of the rotation portion to suppress the approach of the rotation portion to the base portion, and a front portion (172) is provided between the outer periphery of the base portion and the outer periphery of the rotation portion. and a biasing portion (172) that biases the rotating portion toward the base portion, the spacer portion is provided on the base portion and has a plurality of support shaft portions (171A) extending radially centered on the rotation axis, and a plurality of rollers (171B) rotatably supported on each of the plurality of support shaft portions, the outer peripheral surfaces of the plurality of rollers are formed into a tapered surface whose diameter increases radially outwardly centered on the rotation axis, the rotating portion has an inclined surface (188) that inclines upwardly radially outwardly centered on the rotation axis, and the plurality of rollers abut against the inclined surface.

[0087] According to this aspect, the rollers can support not only the vertical load applied from the rotating part, but also the radial load centered on the rotation axis, thereby suppressing the horizontal positional deviation of the rotating part relative to the fixed part.

[0088] In the above aspect, the plurality of support shaft portions may be provided with biasing members (172D) that bias the corresponding rollers inward in the radial direction centered on the rotation axis.

[0089] According to this aspect, the plurality of rollers can be brought into contact with the inclined surface.

[0090] In the above aspect, the plurality of support shaft portions may be supported by a plurality of support brackets provided on the base portion.

[0091] According to this aspect, the roller, the support shaft, and the support bracket can be unitized, which makes it easier to attach the roller to the base.

[0092] In the above aspect, each of the multiple support brackets may have an inner wall (171C) that supports an inner end of the support shaft portion in a radial direction centered on the rotation axis of the support shaft portion, and an outer wall (171D) that supports an outer end of the support shaft portion in a radial direction centered on the rotation axis of the support shaft portion.

[0093] According to this aspect, the support shaft portion can be supported with good stability.

[0094] In the above aspect, the plurality of biasing members may be coil springs arranged on outer peripheries of the corresponding support shaft portions.

[0095] According to this aspect, the mounting structure of the urging member can be simplified.

[0096] In the above aspect, each of the multiple rollers has a recess (171F) at its end radially outwardly from the rotation axis centered on the rotation axis that is recessed toward the rotation axis, and each end of the multiple urging members may be received in the corresponding recess.

[0097] According to this aspect, the positional deviation of the urging member with respect to the roller is suppressed.

[0098] In the above aspect, the upper end of the inner wall may be located below the upper edge of the inner end in a radial direction centered on the rotation axis of the roller, and the upper end of the outer wall may be located below the upper edge of the outer end in a radial direction centered on the rotation axis of the roller.

[0099] According to this aspect, the inner wall and the outer wall are prevented from coming into contact with the rotating portion.

[0100] In the above aspect, an annular bearing (63) centered on the rotation axis may be provided between the base portion and the rotating portion, and the plurality of rollers may be disposed outward from the bearing.

[0101] According to this aspect, since the plurality of rollers are disposed outward from the bearings, a distance is maintained between the outer periphery of the base portion and the outer periphery of the rotating portion, thereby making it possible to suppress tilting of the rotating portion.

[0102] In the above aspect, a peeling suppression portion (170) is provided between the outer periphery of the base portion and the outer periphery of the rotating portion, and the peeling suppression portion has a lower hook (182) protruding upward from the base portion and an upper hook (186) protruding downward from the rotating portion and facing the lower hook from below via a gap, and the peeling suppression portion may be positioned outward from the roller in the radial direction centered on the rotation axis.

[0103] According to this aspect, even when a large load is applied to the seat body during a vehicle collision or the like, tilt of the rotating part relative to the fixed part can be suppressed.

[0104] In the above aspect, the biasing portion may be disposed inwardly of the separation suppression portion in a radial direction centered on the rotation axis.

[0105] According to this aspect, the biasing portion can be arranged compactly. [Brief description of the drawings]

[0106] [Figure 1] FIG. 1 is a perspective view of a vehicle seat according to an embodiment; [Diagram 2] 1 is a perspective view of a frame of a vehicle seat; [Diagram 3] FIG. 2 is a perspective view of the rotating device with the upper bracket omitted. [Figure 4] FIG. 2 is a perspective view of the rotating device with the upper bracket and the rotating device cover omitted; [Diagram 5] Exploded perspective view of the rotating device [Figure 6] Bottom view of the rotating device [Figure 7] Cross-section of the rotating device [Figure 8] Cross-section of a rotating device [Figure 9] A bottom view showing the main part of the rotating device. [Figure 10] FIG. 3 is a perspective view showing a main part of a rotating device; [Figure 11] Cross-sectional view of the spacer [Figure 12] Cross-sectional view of the biasing portion and the peeling prevention portion [Figure 13] Cross-section of the rotating device [Figure 14] Exploded perspective view of the rotating device cover [Figure 15] A perspective view of a partition wall and a flange [Figure 16] Sectional view of partition wall and flange [Figure 17] Cross-section of the rotating device [Figure 18] FIG. 11 is a cross-sectional view showing the positional relationship between an upper cover side portion and a side cover according to a modified example. [Figure 19] FIG. 11 is a cross-sectional view showing the positional relationship between an upper cover side portion and a side cover according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0107] Hereinafter, an embodiment of a vehicle seat according to the present invention will be described with reference to the drawings. The vehicle seat is applied to a known automobile, for example, a sedan type or a minivan type. The automobile may be an autonomous vehicle.

[0108] As shown in FIG. 1, the vehicle seat 1 has a rotation device 2. The vehicle seat 1 also has a seat body 3 and left and right sliding devices 4. The rotation device 2 is provided on a floor 5 via the left and right sliding devices 4. The seat body 3 has a seat cushion 7, a seat back 8, and a headrest 9. The seat cushion 7 supports the buttocks of a user from below. The seat back 8 extends upward from the rear of the seat cushion 7. The seat back 8 supports the back of the user from behind. The headrest 9 is provided on an upper part of the seat back 8.

[0109] As shown in FIG. 2, the seat cushion 7 has a seat cushion frame 11 forming a skeleton, a pad 12 supported by the seat cushion frame 11, and a skin material 13 covering the surface of the pad 12. The seat cushion frame 11 has left and right seat cushion side members 15 extending in the front-rear direction, a front member 16 extending in the left-right direction and connected to the front ends of the left and right seat cushion side members 15, and a rear member 17 extending in the left-right direction and connected to the rear ends of the left and right seat cushion side members 15. A flexible support member 18 supporting the buttocks of a user is stretched between the front member 16 and the rear member 17. The support member 18 may have a plurality of metal wires and a flexible resin plate connected to each wire. As shown in FIG. 1, side covers 21 are provided on the left and right side portions of the seat cushion 7. The side covers 21 are supported by the seat cushion side members 15 and hide the ends of the pad 12 and the skin material 13. The side covers 21 may be formed of a resin material.

[0110] As shown in FIG. 2, the seat back 8 has a seat back frame 23 forming a skeleton, a pad 24 supported by the seat back frame 23, and a skin material 25 covering the surface of the pad 24. The seat back frame 23 has left and right seat back side members 27 extending vertically, an upper member 28 extending horizontally and connected to the upper ends of the left and right seat back side members 27, a lower member 29 extending horizontally and connected to the lower ends of the left and right seat back side members 27, and an intermediate member 31 extending horizontally between the upper member 28 and the lower member 29 and connected to the left and right seat back side members 27. A flexible support member 34 supporting the back of the user is stretched across the left and right seat back side members 27, the intermediate member 31, and the lower member 29. The support member 34 may be formed of a plurality of metal wires. The lower ends of the left and right seat back side members 27 are connected to the rear ends of the corresponding seat cushion side members 15 via reclining devices 35. The reclining device 35 is capable of arbitrarily adjusting the inclination angle of the seat back 8 relative to the seat cushion 7.

[0111] As shown in Figures 3, 4, 5, and 6, the slide device 4 has left and right lower rails 36 extending forward and backward, and left and right upper rails 37 supported on each lower rail 36 so as to be slidable forward and backward. Each lower rail 36 is coupled to the floor 5 via a foot 38. A slide lock device (not shown) is provided between each lower rail 36 and the corresponding upper rail 37. The left and right slide lock devices are connected to each other by a slide operation lever extending left and right. A user can operate the slide operation lever to make the upper rail 37 slidable relative to the lower rail 36.

[0112] 1 to 6, the rotation device 2 is provided between a floor 5 and a seat cushion 7, and supports the seat cushion 7 rotatably about a rotation axis (axis A) extending in the vertical direction. The rotation device 2 has a base portion 41 and a rotating portion 42 rotatably supported by the base portion 41. The rotation device 2 also has a rotation actuator 43 and a rotation lock device 44.

[0113] The base portion 41 is provided on the floor 5 side. In this embodiment, the base portion 41 is provided on the floor 5 via the slide device 4. The base portion 41 has a lower bracket 46 coupled to the left and right upper rails 37 and a base plate 47 supported by the lower bracket 46. In this embodiment, the base portion 41 has front and rear lower brackets 46. The front and rear lower brackets 46 are formed symmetrically with respect to the front and rear. Each lower bracket 46 extends left and right, and both ends are coupled to the left and right upper rails 37. The front and rear lower brackets 46 are arranged with a gap between them in the front and rear. Both left and right ends of the front lower bracket 46 are coupled to the front ends of the corresponding left and right upper rails 37. Both left and right ends of the rear lower bracket 46 are coupled to the rear ends of the corresponding left and right upper rails 37. The base plate 47 is formed in a circular shape, and the surface faces up and down. A front portion of the base plate 47 is joined to a middle portion of the front lower bracket 46, and a rear portion of the base plate 47 is joined to a middle portion of the rear lower bracket 46. The base plate 47 is supported by the left and right upper rails 37 via the pair of front and rear lower brackets 46.

[0114] The base plate 47 and the front and rear lower brackets 46 may be formed of metal plates. The cross section of each lower bracket 46 may be formed in the shape of a groove that opens downward.

[0115] As shown in Figs. 7 and 8, a first bulge 51 bulging downward is formed in the center of the base plate 47. The first bulge 51 is formed in a cylindrical shape with a bottom. A circular first bearing hole 52 penetrating the first bulge 51 in the thickness direction is formed in the center of the first bulge 51. The first bearing hole 52 is centered on an axis A extending vertically. The edge of the first bearing hole 52 may be formed with an annular edge wall 52A protruding upward or downward.

[0116] An annular fixing member 54 is coupled to the outer periphery of the base plate 47. The fixing member 54 has a cylindrical wall 54A that extends along the outer periphery of the base plate 47 and also extends upward, and an inner flange 54B that extends radially inward from the upper end of the wall 54A. The wall 54A is welded to the outer periphery of the base plate 47. The inner flange 54B is formed in an annular shape with its surfaces facing up and down.

[0117] The rotating part 42 is rotatably supported by the base part 41. The rotating part 42 has a rotating plate 56 rotatably supported on the upper surface of the base plate 47, and an upper bracket 57 coupled to the rotating plate 56. The rotating plate 56 and the upper bracket 57 are formed of a metal plate.

[0118] The rotating plate 56 is formed in a disk shape with its surfaces facing up and down. A circular second bearing hole 61 is formed in the center of the rotating plate 56, penetrating it in the thickness direction. The second bearing hole 61 is centered on the axis A.

[0119] The rotating plate 56 is supported on the upper surface of the base plate 47 via a bearing 63. The bearing 63 is formed in an annular shape centered on the axis A. The bearing 63 is disposed between the upper surface of the outer periphery of the base plate 47 and the lower surface of the outer periphery of the rotating plate 56. The bearing 63 may be a thrust bearing. In this embodiment, the bearing 63 is a ball bearing. The ball bearing has a plurality of balls and an annular retainer that rotatably supports the plurality of balls. A first bearing groove 47A that receives the lower part of the bearing 63 is formed on the upper surface of the outer periphery of the base plate 47. A second bearing groove 56A that receives the upper part of the bearing 63 is formed on the lower surface of the outer periphery of the rotating plate 56. A space 65 is formed between the center of the rotating plate 56 and the first bulging part 51 of the base plate 47.

[0120] The fixing member 54 extends above the outer periphery of the rotating plate 56. Specifically, the inner flange 54B of the fixing member 54 extends above the outer periphery of the rotating plate 56. A protector 67 is provided on the outer periphery of the upper surface of the rotating plate 56. The protector 67 has an annular sliding portion 67A extending along the outer periphery of the upper surface of the rotating plate 56 and a plurality of claw portions 67B protruding downward from the sliding portion 67A. The cross section of the sliding portion 67A is formed in a plate shape. The plurality of claw portions 67B are engaged with a plurality of mounting holes 56B formed in the rotating plate 56. The outer periphery of the rotating plate 56 is in sliding contact with the inner flange 54B via the sliding portion 67A of the protector 67. The protector 67 is preferably formed of a resin material having a lower friction resistance than the rotating plate 56.

[0121] A support tube 87 extending vertically is inserted into the first bearing hole 52 and the second bearing hole 61. The support tube 87 is a cylinder with both upper and lower ends open. The support tube 87 is made of metal. An annular rib 88 that bulges outward is formed on the outer periphery of the support tube 87. A cylindrical bush 91 is attached to the edge of the second bearing hole 61 of the rotating plate 56. The bush 91 is supported by a portion of the support tube 87 above the annular rib 88. A drop prevention ring 92 is provided above the bush 91. The upper end of the support tube 87 is crimped to form an expanded diameter portion 93. The bush 91 and the drop prevention ring 92 are sandwiched between the annular rib 88 and the expanded diameter portion 93. This determines the vertical position of the rotating plate 56 relative to the support tube 87. The support tube 87 is rotatably supported by the second bearing hole 61 of the rotating plate 56 via the bush 91.

[0122] The first bearing hole 52 of the base plate 47 is disposed below the annular rib 88. A portion of the support tube 87 below the annular rib 88 may be rotatably supported in the first bearing hole 52, or may be welded to the first bearing hole 52. The support tube 87 positions the base plate 47 and the rotating plate 56 on the axis A.

[0123] 5, an upwardly bulging annular protrusion 95 is formed on the inner side of the second bearing groove 56A of the rotating plate 56. The protrusion 95 is formed in an annular shape centered on the axis A. The protrusion 95 is provided with a plurality of bolts 96 extending upward. The bolts 96 may be stud bolts.

[0124] The upper bracket 57 is formed in a plate shape with its surfaces facing up and down. The upper bracket 57 may be formed in a rectangular shape when viewed from above. A recess 101 recessed downward is formed in the center of the upper bracket 57. An opening 102 penetrating vertically is formed in the center of the recess 101. A plurality of fastening holes 103 through which a plurality of bolts 96 pass are formed in the bottom of the recess 101. The rotating plate 56 and the upper bracket 57 are fastened to each other by attaching a nut to each bolt 96. The upper bracket 57 is formed larger than the rotating plate 56 when viewed from above. The upper bracket 57 faces the front and rear lower brackets 46 in the vertical direction.

[0125] As shown in FIG. 13, a lifting device 110 is provided between the rotating device 2 and the seat cushion 7. The lifting device 110 is provided between the upper bracket 57 and the left and right seat cushion side members 15. The lifting device 110 has a plurality of links connecting the upper surface of the upper bracket 57 to the left and right seat cushion side members 15, and an electric motor that drives the links. For example, a sector gear may be provided on the link, and a pinion that meshes with the sector gear may be connected to the output shaft of the electric motor via a reduction mechanism. As a result, the link rotates in response to the rotation of the electric motor, and the seat cushion 7 rises and falls. The lifting device 110 supports the seat cushion 7 so that it can move between a high position and a low position in the up-down direction relative to the rotating device 2.

[0126] As shown in Fig. 7, the rotary actuator 43 is attached to the lower surface of the base plate 47. The rotary actuator 43 rotates the rotary plate 56 relative to the base plate 47. The rotary actuator 43 has an electric motor 111 and a speed reduction mechanism 112. In this embodiment, the speed reduction mechanism 112 has a pinion 115 coupled to an output shaft 113 of the electric motor 111, and a gear 116 coupled to the rotary plate 56. The pinion 115 and the gear 116 are spur gears. The gear 116 is a gear centered on the axis A.

[0127] The rotary actuator 43 may be coupled to the lower surface of the base plate 47 via a mount. An output shaft 113 of the rotary actuator 43 extends upward from the reduction mechanism 112. The output shaft 113 passes through a through hole 119 formed in the base plate 47 and extends into the space 65. A pinion 115 coupled to the output shaft 113 is disposed in the space 65 and meshes with a gear 116. The electric motor 111 and the reduction mechanism 112 are disposed below the base plate 47.

[0128] 8 and 9, the rotation lock device 44 is attached to the lower surface of the base plate 47. The rotation lock device 44 selectively prohibits rotation of the rotation plate 56 relative to the base plate 47. The rotation lock device 44 has a holder 122 protruding downward from the lower surface of the base plate 47, and a lock claw 121 that is rotatably supported by the holder 122 and penetrates the base plate 47 to engage with the rotation plate 56. The lock claw 121 is displaceable between a locked position where it engages with the rotation plate 56 and a released position where it is separated from the rotation plate 56.

[0129] The holder 122 has a peripheral wall portion 123 extending in the circumferential direction centered on the axis A, which is the rotation axis of the rotating plate 56, and a pair of end wall portions 124 extending radially inward centered on the axis A from both ends of the peripheral wall portion 123. The holder 122 has a bottom plate 125 extending along the lower surface of the base plate 47 and joined to the lower surface of the base plate 47. The bottom plate 125 extends along the lower surface of the first bulging portion 51. The peripheral wall portion 123 and the pair of end wall portions 124 protrude downward from the bottom plate 125. The pair of end wall portions 124 are joined to the bottom plate 125. The peripheral wall portion 123 may be joined to the bottom plate 125. The peripheral wall portion 123 and the pair of end wall portions 124 are formed by bending a metal plate. The peripheral wall portion 123 and the pair of end wall portions 124 may be formed by combining a plurality of metal plates.

[0130] A pair of openings 126 penetrating in the vertical direction are formed in the bottom plate 125 and the first bulging portion 51. The pair of openings 126 are formed at positions corresponding to the end wall portions 124, respectively. Each end wall portion 124 has an extension portion 124A that passes through the corresponding opening 126 and extends above the base plate 47. The upper end of each extension portion 124A is disposed within the space 65. The upper end of each extension portion 124A extends above the gear 116.

[0131] The locking claw 121 has a pair of arms 121A rotatably supported on the end wall portions 124, a beam portion 121B connecting the tips of the pair of arms 121A, and a claw portion 121C protruding from the beam portion 121B. Each arm 121A is supported on the corresponding extension portion 124A so as to be rotatable about an axis B (second axis). The axis B forms the rotation axis of the locking claw 121. The axis B is disposed above the base plate 47, and may be disposed above the gear 116. The pair of arms 121A pass through the corresponding openings 126 and extend from the space 65 below the base plate 47. The pair of arms 121A extend along the corresponding end wall portions 124 and are in sliding contact with the corresponding end wall portions 124. The beam portion 121B is disposed below the base plate 47 and extends in the horizontal direction.

[0132] The base plate 47 and the bottom plate 125 are formed with insertion holes 131 penetrating in the up-down direction. The insertion holes 131 extend in the circumferential direction centered on the axis A. The rotating plate 56 is formed with a plurality of lock holes 132 with which the lock claws 121 can be selectively engaged. Each lock hole 132 extends in the circumferential direction centered on the axis A. The plurality of lock holes 132 are provided at rotationally symmetric positions centered on the axis A. When the rotating plate 56 is at a predetermined rotation position with respect to the base plate 47, the insertion hole 131 faces one of the plurality of lock holes 132. The lock claws 121 pass through the insertion holes 131 and enter the lock holes 132 in the locked position, and move away from the insertion holes 131 and the lock holes 132 in the unlocked position.

[0133] When the rotating plate 56 is in the initial position, the seat body 3 faces forward. As shown in Fig. 8, the claw portion 121C of the locking claw 121 passes through the insertion hole 131 and fits into one of the locking holes 132, thereby restricting the rotation of the rotating plate 56 relative to the base plate 47.

[0134] 9, a biasing member 134 that biases the locking claw 121 toward the lock position is provided between the locking claw 121 and the holder 122. In this embodiment, the biasing member 134 is a tension coil spring. The biasing member 134 may be connected to the arm portion 121A and the peripheral wall portion 123.

[0135] The locking claw 121 is connected to the manual operation lever by a control cable 141. When the user pulls the manual operation lever, the locking claw 121 is pulled from the locked position to the unlocked position by the control cable 141. This allows the rotating part 42 to rotate with respect to the base part 41. When the user stops operating the manual operation lever, the locking claw 121 moves from the unlocked position to the locked position by the biasing force of the biasing member 134. In other words, the rotation lock device 44 changes between the locked state and the unlocked state by manual operation by the user.

[0136] The rotation lock device 44 has an unlocking actuator 151 that moves the locking claw 121 from the locked position to the unlocked position. The unlocking actuator 151 has an electric motor 152, a speed reduction mechanism 153 that reduces the speed of the driving force of the electric motor 152 and transmits it, and an arm 154 that is provided on the output shaft of the speed reduction mechanism 153. The arm 154 engages with the locking claw 121. One arm tip 121F of the locking claw 121 is provided with a contact portion 121G that protrudes downward. The arm 154 presses the contact portion 121G to move the locking claw 121 from the locked position to the unlocked position.

[0137] As shown in FIG. 4 and FIG. 10, a plurality of peeling prevention parts 170, a plurality of spacer parts 171, and a plurality of urging parts 172 are provided between the outer periphery of the base part 41 and the outer periphery of the rotating part 42. The peeling prevention parts 170, the spacer parts 171, and the urging parts 172 are combined with each other to form a unit 175. In this embodiment, four units 175 including one peeling prevention part 170, two spacer parts 171, and one urging part 172 are formed. Each unit 175 has the same structure. The four units 175 are arranged at intervals on a virtual circle centered on the axis A. The four units 175 are provided at the left and right ends of the front and rear lower brackets 46.

[0138] The unit 175 has a support bracket 176 provided on the base portion 41. The support bracket 176 has a bottom plate 181 joined to the upper surface of the lower bracket 46. A lower hook 182 protruding upward is provided on the edge of the bottom plate 181 on the outer side in the radial direction about the axis A. An upper portion of the lower hook 182 is curved downward. A tip of the lower hook 182 extends downward. A tip of the lower hook 182 is disposed at a distance from the upper surface of the lower bracket 46. The lower hook 182 has a width in the circumferential direction about the axis A.

[0139] As shown in Figs. 4 and 12, the unit 175 has an upper unit 183 provided on the lower surface of the rotating part 42. The upper unit 183 has an upper plate 184 joined to the lower surface of the upper bracket 57. An upper hook 186 protruding downward is provided on the edge of the upper plate 184 on the outer side in the radial direction about the axis A. A lower portion of the upper hook 186 is curved upward. A tip of the upper hook 186 extends upward. The tip of the upper hook 186 is disposed at a distance from the lower surface of the upper bracket 57. The upper hook 186 has a width in the circumferential direction about the axis A.

[0140] 4, 12, and 13, when the rotating part 42 is in the initial position with respect to the base part 41, the upper hook 186 faces the corresponding lower hook 182 with a gap therebetween in the vertical direction. The corresponding lower hook 182 and upper hook 186 constitute a peeling suppression part 170. The peeling suppression part 170 is provided between the outer periphery of the base part 41 and the outer periphery of the rotating part 42, and suppresses upward movement of the outer periphery of the rotating part 42 with respect to the outer periphery of the base part 41. Even when a large load is applied to the seat main body 3 during a vehicle collision, the peeling suppression part 170 suppresses the inclination of the rotating part 42 with respect to the base part 41.

[0141] As shown in FIG. 11, each spacer portion 171 has a support shaft portion 171A provided on the base portion 41 and extending in a radial direction centered on the axis A, and a roller 171B rotatably supported by the support shaft portion 171A. Each spacer portion 171 suppresses the approach of the rotating portion 42 to the base portion 41. The support bracket 176 has an inner wall 171C supporting the inner end of the support shaft portion 171A in the radial direction centered on the axis A, and an outer wall 171D supporting the outer end of the support shaft portion 171A in the radial direction centered on the axis A. This allows the support shaft portion 171A to be supported with good stability. The inner wall 171C and the outer wall 171D are preferably formed integrally with the bottom plate 181. For example, the inner wall 171C is preferably formed by bending upward the inner edge portion of the bottom plate 181 in the radial direction centered on the axis A. The outer wall 171D may be formed by cutting a part of the bottom plate 181 upward.

[0142] The outer peripheral surface of the roller 171B is formed into a tapered surface whose diameter increases radially outwardly about the axis A. The support shaft portion 171A is provided with a biasing member 171E that biases the corresponding roller 171B radially inwardly about the axis A. The biasing member 171E is a coil spring and is disposed on the outer periphery of the corresponding support shaft portion 171A. This allows the biasing member 171E to be attached to the roller 171B with a simple configuration. The biasing member 171E is a compression coil spring and is disposed between the outer wall 171D and the roller 171B. The roller 171B has a recess 171F recessed toward the axis A at an end portion on the radially outward side about the axis A. The end portion of the biasing member 171E is received in the recess 171F. This suppresses the positional deviation of the biasing member 171E with respect to the roller 171B. Since the spacer portion 171 abuts against the rotating portion at the roller 171B, the frictional resistance between the spacer portion 171 and the rotating portion caused by the rotation of the rotating portion can be reduced.

[0143] The rotating part 42 has an inclined surface 188 inclined upward toward the radially outward direction centered on the axis A. The inclined surface 188 is formed in an annular shape centered on the axis A. The inclined surface 188 is formed on the upper bracket 57. The inclined surface 188 may be provided along the outer periphery of the recess 101. Each roller 171B abuts against the inclined surface 188. The rollers 171B can support a radial load centered on the axis A in addition to a vertical load applied from the rotating part 42. This allows the rollers 171B to suppress a horizontal positional deviation of the rotating part 42 relative to the fixed part. Since the biasing member 171E biases the rollers 171B radially inward centered on the axis A, the rollers 171B can abut against the inclined surface 188 appropriately.

[0144] An upper end of the inner wall 171C is located below an upper edge of the inner end of the roller 171B in a radial direction centered on the axis A. In addition, an upper end of the outer wall 171D is located below an upper edge of the outer end of the roller 171B in a radial direction centered on the axis A. This prevents the inner wall 171C and the outer wall 171D from contacting the rotating portion 42.

[0145] As shown in Fig. 12, the biasing portion 172 includes a locking piece 172A protruding downward from the rotating portion 42, a support 172B protruding upward from the base portion 41, a contact member 172C supported by the support 172B so as to be movable in the vertical direction and contacting the locking piece 172A from above, and a biasing member 172D provided between the support 172B and the contact member 172C and biasing the contact piece downward. The biasing portion 172 biases the rotating portion 42 toward the base portion 41. The support 172B extends upward from the bottom plate 181. The support 172B may be formed into a cylinder. A stopper 172E is provided at the upper end of the support 172B. The abutment member 172C has a cylindrical tube portion 172F and a disk-shaped flange portion 172G protruding radially outward from the upper end of the tube portion 172F. The tube portion 172F is disposed on the outer periphery of the support pillar 172B. The tube portion 172F is supported so as to be movable in the up and down direction relative to the support pillar 172B, and is supported so as to be rotatable about the support pillar 172B.

[0146] The biasing member 172D is a compression coil spring and is disposed on the outer periphery of the support 172B and between the stopper 172E and the flange portion 172G.

[0147] The locking piece 172A extends downward from the upper plate 184, and then bends to extend radially inward about the axis A. The locking piece 172A may be formed by bending the inside of the upper plate 184. The lower end of the locking piece 172A is disposed below the flange portion 172G.

[0148] The contact member 172C urged downward by the urging member 172D abuts against the lower end of the locking piece 172A from above at the flange portion 172G. This causes the urging portion 172 to urge the outer periphery of the rotating portion 42 downward. The urging portion 172 causes the rotating portion 42 to appropriately abut against the multiple rollers 171B.

[0149] As shown in FIG. 10, the spacer portions 171 and the urging portions 172 included in the four units 175 are arranged on a virtual circle C centered on the axis A. Since the spacer portions 171 and the urging portions 172 are provided between the outer periphery of the base portion 41 and the outer periphery of the rotating portion 42, the distance between the base portion 41 and the rotating portion 42 is maintained. This makes it possible to suppress the inclination of the rotating portion 42 in the vehicle seat 1 having the rotation device 2. Furthermore, since the spacer portions 171 and the urging portions 172 are arranged on the virtual circle C, the rotating portion 42 can be supported in a well-balanced manner with respect to the base portion 41, and the spacer portions 171 and the urging portions 172 can be arranged compactly.

[0150] The lower hook 182 is disposed outside the imaginary circle C. One of the spacer portion 171 and the urging portion 172 may be disposed on a radial line extending from the axis A to the lower hook 182. This allows the spacer portion 171, the urging portion 172, and the peeling suppression portion 170 to be disposed compactly. At least one of the multiple spacer portions 171 and the lower hook 182 may be disposed on a radial line centered on the axis A.

[0151] Since the spacer portion 171, the biasing portion 172, and the peeling prevention portion 170 are unitized by the support bracket 176, the attachment work for these is easy.

[0152] In each of the support brackets 176, one urging portion 172 is disposed between two spacer portions 171. As a result, the rotating portion 42 urged downward by the urging portion 172 comes into contact with the two rollers 171B, thereby making it possible to suppress tilting of the rotating portion 42.

[0153] As shown in FIG. 4 and FIG. 10, the spacer portions 171 are disposed outward of the bearing 63 in the radial direction centered on the axis A. The rollers 171B may also be disposed outward of the bearing 63. Since the spacer portions 171 are disposed outward of the bearing 63, a distance is maintained between the outer periphery of the base portion 41 and the outer periphery of the rotating portion 42. This makes it possible to suppress tilting of the rotating portion 42 in the vehicle seat 1 having the rotating device 2. In addition, the load applied to the bearing 63 is reduced by the spacer portions 171. This makes it difficult for indentations caused by the bearing 63 to be formed on the rotating portion 42 and the base portion 41.

[0154] The peeling suppression portion 170 is disposed outward of the spacer portion 171 in the radial direction centered on the axis A. The peeling suppression portion 170 is preferably disposed outward of the roller 171B in the radial direction centered on the axis A. This makes it possible to suppress the inclination of the rotating portion 42 with respect to the base portion 41 even when a large load is applied to the seat main body 3 during a vehicle collision, for example.

[0155] The urging portion 172 is preferably disposed inward from the peeling suppression portion 170 in the radial direction centered on the axis A. This allows the urging portion 172 to be disposed compactly.

[0156] The rotation position of the rotating part 42 when the seat cushion 7 faces the front of the vehicle is defined as the reference rotation position. When the rotating part 42 is in the reference rotation position, the lower hook 182 and the upper hook 186 of the peeling prevention part 170 of each unit 175 face each other with a vertical gap. In addition, the biasing part 172 and the locking piece 172A of each unit 175 abut against each other. Even when the rotating part 42 is rotated 90 degrees (+90 degrees) to the right, 90 degrees (-90 degrees) to the left, or 180 degrees (-180 degrees) to the left from the reference rotation position, the lower hook 182 and the upper hook 186 face each other with a vertical gap, and the biasing part 172 and the locking piece 172A abut against each other. The rollers 171B always abut against the inclined surface 188 of the upper bracket 57, regardless of the rotation position of the rotating part 42.

[0157] 3 and 14, the rotation device 2 is provided with a rotation device cover 200. The rotation device cover 200 has a lower cover 201 provided on the base portion 41 and an upper cover 202 provided on the rotating portion .

[0158] The lower cover 201 has a lower cover front portion 204 arranged in front of the base plate 47, a lower cover rear portion 205 arranged behind the base plate 47, and left and right lower cover side portions 206 arranged on the left and right sides of the base plate 47.

[0159] As shown in Figs. 4 and 6, the front lower bracket 46 is provided with a front lower cover attachment portion 211. The front lower cover attachment portion 211 extends in the left-right direction in front of the front lower bracket 46, and is joined to the front lower bracket 46 at its left and right ends. The front lower cover attachment portion 211 has a first wire 212, a second wire 213, and left and right extension pieces 214. The first wire 212 has a first support portion 212A extending left and right, and left and right first connecting portions 212B extending rearward from the left and right ends of the first support portion 212A. The left and right first connecting portions 212B are joined to the lower surface of the front lower bracket 46. The first support portion 212A is disposed forward of the front lower bracket 46.

[0160] The second wire 213 has a second support portion 213A extending in the left-right direction, and left and right second connecting portions 213B extending forward from left and right ends of the second support portion 213A. The left second connecting portion 213B is connected to the left first connecting portion 212B, and the right second connecting portion 213B is connected to the right first connecting portion 212B. The second support portion 213A is disposed between the first support portion 212A and the front edge of the front lower bracket 46. The first support portion 212A and the second support portion 213A are spaced apart from each other in the front-rear direction and extend parallel to each other in the left-right direction.

[0161] The left and right extension pieces 214 are coupled to the left and right corresponding first connecting portions 212B. The left and right extension pieces 214 extend outwardly to the left and right from the left and right corresponding first connecting portions 212B. The left and right outer ends of the left and right extension pieces 214 may be coupled to front edges of the front lower bracket 46.

[0162] The rear lower bracket 46 is provided with a rear lower cover mounting portion 217. The rear lower cover mounting portion 217 is formed symmetrically in the front-to-rear direction with the front lower cover mounting portion 211. Like the front lower cover mounting portion 211, the rear lower cover mounting portion 217 has a first wire 217A, a second wire 217B, and left and right extension pieces 217C.

[0163] Left and right side lower cover mounting portions 219 are provided at the left and right ends of the front lower bracket 46 and the rear lower bracket 46. The left and right side lower cover mounting portions 219 are formed symmetrically with respect to each other. The horizontal lower cover mounting portions 219 are formed of a wire member. The horizontal lower cover mounting portions 219 extend in the front-rear direction. The horizontal lower cover mounting portions 219 have a plurality of protrusions 219A that protrude inwardly to the left and right and are connected to the front lower bracket 46 and the rear lower bracket 46. The front end, rear end, and middle portion of the horizontal lower cover mounting portions 219 are spaced outwardly to the left and right from the ends of the front and rear lower brackets 46.

[0164] As shown in Figures 3 and 14, the lower cover front part 204 is placed on the front lower cover attachment part 211. The lower cover front part 204 is formed in a plate shape with its surfaces facing up and down. The lower cover front part 204 extends in the left-right direction. The lower cover front part 204 has a front lower cover arc part 204A that extends in an arc shape centered on the axis A and extends upward. The front lower cover arc part 204A forms the front edge of the lower cover front part 204. The front lower cover arc part 204A extends from the left end to the right end of the lower cover front part 204.

[0165] 6, a plurality of reinforcing ribs 204B protruding downward are formed on the lower surface of the lower cover front part 204. The first support part 212A and the second support part 213A abut against the lower surface of the lower cover front part 204 via the plurality of reinforcing ribs 204B. In other embodiments, the first support part 212A and the second support part 213A may directly abut against the lower surface of the lower cover front part 204. Since the lower cover front part 204 is supported by the first support part 212A and the second support part 213A, rotation of the lower cover front part 204 is suppressed.

[0166] The left and right ends of the lower cover front part 204 are fastened to the corresponding left and right extension pieces 214 by fastening members such as screws. As a result, the lower cover front part 204 is attached to the front lower cover mounting part 211 at multiple locations. A plurality of front locking claws 204C that lock the second support parts 213A are provided on the underside of the lower cover front part 204. This improves the stability of the lower cover front part 204 relative to the front lower cover mounting part 211. In this manner, the lower cover front part 204 is disposed in front of the lower bracket 46.

[0167] The lower cover rear part 205 is formed symmetrically in the front-rear direction to the lower cover front part 204. The lower cover rear part 205 has a rear lower cover arc part 205A. The attachment structure of the lower cover rear part 205 to the rear lower cover attachment part 217 is similar to the attachment structure of the lower cover front part 204 to the front lower cover attachment part 211.

[0168] As shown in Figures 3 and 14, the left and right lower cover side portions 206 are formed symmetrically with respect to each other. Each of the lower cover side portions 206 is formed in a plate shape with its surface facing up and down. Each of the lower cover side portions 206 extends in the front-to-rear direction. The lower cover side portion 206 has a lateral lower cover arc portion 206A that extends in an arc shape centered on the axis A and extends upward. The lateral lower cover arc portion 206A extends from the front end to the rear end of the lower cover side portion 206.

[0169] Flat plate portions 206B with their surfaces facing up and down are provided at the front and rear ends of the lower cover side portions 206. The front and rear flat plate portions 206B are disposed radially outward from the axis A centered on the lateral lower cover arc portions 206A.

[0170] Each lower cover side portion 206 is disposed above the ends of the front and rear lower brackets 46, the left and right upper rails 37, and the lateral lower cover mounting portion 219. The front end of the lower cover side portion 206 is joined to the front extension piece 214 with a fastener such as a screw, and the rear end of the lower cover side portion 206 is joined to the rear extension piece 214 with a fastener such as a screw.

[0171] A plurality of locking claws 206C for locking the horizontal lower cover mounting portions 219 are formed on the underside of the lower cover side portions 206. When viewed from above, the left and right lower cover side portions 206 overlap with the corresponding lower rails 36 on the left and right. The lower cover side portions 206 cover a portion of the lower rail 36. The left and right upper rails 37 are disposed below the left and right lower cover side portions 206.

[0172] The lower cover front portion 204 and the lower cover rear portion 205 are respectively connected to the left and right lower cover side portions 206. The front end of the lower cover side portion 206 and the end portion of the lower cover front portion 204 may be fastened together to the front extension piece 214. The rear end of the lower cover side portion 206 and the end portion of the lower cover rear portion 205 may be fastened together to the rear extension piece 214. As a result, the lower cover front portion 204, the lower cover rear portion 205, and the left and right lower cover side portions 206 are formed into an annular shape centered on the axis A. The front lower cover arc portion 204A, the rear lower cover arc portion 205A, and the left and right lateral lower cover arc portions 206A cooperate with each other to form a cylindrical surface centered on the axis A.

[0173] By combining the lower cover front portion 204, the lower cover rear portion 205, and the left and right lower cover side portions 206 with each other, the lower cover 201 can be disposed around the base plate 47 after the rotation device 2 is formed.

[0174] As shown in Figures 3 and 14, the upper cover 202 has an upper cover front portion 221 arranged in front of the upper bracket 57, an upper cover rear portion 222 arranged behind the upper bracket 57, and left and right upper cover side portions 223 arranged on the left and right sides of the upper bracket 57.

[0175] As shown in FIG. 5, an edge wall 57A extending upward is provided at the edge of the upper bracket 57. The edge wall 57A extends along the outer periphery of the upper bracket 57. The front, rear, left, and right upper cover mounting parts 225 are coupled to the edge wall 57A. The front upper cover mounting part 225 is coupled to the front edge of the upper bracket 57. The rear upper cover mounting part 225 is coupled to the rear edge of the upper bracket 57. The left upper cover mounting part 225 is coupled to the left edge of the upper bracket 57. The right upper cover mounting part 225 is coupled to the right edge of the upper bracket 57. Each upper cover mounting part 225 has a vertical wall part 225A extending vertically and a horizontal wall part 225B extending radially outward from the lower end of the vertical wall part 225A centered on the axis A. The vertical wall portion 225A and the horizontal wall portion 225B extend along the edge wall 57A.

[0176] As shown in FIG. 3 and FIG. 14, the upper cover front part 221 has a front upper cover upper wall part 221A extending in the lateral direction (horizontal direction). The front upper cover upper wall part 221A is formed in a plate shape with a surface facing up and down. The front upper cover upper wall part 221A extends in the left-right direction. The front edge of the front upper cover upper wall part 221A is formed in an arc shape centered on the axis A. The front upper cover arc part 221B, which extends in an arc shape centered on the axis A and extends downward, is provided on the front edge of the front upper cover upper wall part 221A. The rear edge of the front upper cover upper wall part 221A extends in the left-right direction. The front upper cover extension wall part 221C, which extends upward, is provided on the rear edge of the front upper cover upper wall part 221A. The front upper cover extension wall part 221C is fastened to the vertical wall part 225A of the front upper cover mounting part 225 by a fastening member such as a screw. The front upper cover top wall portion 221A is supported by the upper surface of the lateral wall portion 225B of the front upper cover attachment portion 225.

[0177] The upper cover rear part 222 is formed symmetrically with the upper cover front part 221 in the front-rear direction. The upper cover rear part 222 has a rear upper cover upper wall part 222A, a rear upper cover arc part 222B, and a rear upper cover extension wall part 222C. The rear upper cover extension wall part 222C is fastened to a vertical wall part 225A of the rear upper cover mounting part 225 by a fastening member such as a screw. The rear upper cover upper wall part 222A is supported on an upper surface of a horizontal wall part 225B of the rear upper cover mounting part 225.

[0178] The left and right upper cover side portions 223 have a horizontal upper cover upper wall portion 223A extending in the horizontal direction (horizontal direction). The horizontal upper cover upper wall portion 223A is formed in a plate shape with a surface facing up and down. The horizontal upper cover upper wall portion 223A extends in the front-rear direction. The left and right outer edges of the horizontal upper cover upper wall portion 223A are formed in an arc shape centered on the axis A. The left and right outer edges of the horizontal upper cover upper wall portion 223A are provided with horizontal upper cover arc portions 223B that extend in an arc shape centered on the axis A and extend downward. The left and right inner edges of the horizontal upper cover upper wall portion 223A extend in the left-right direction. The left and right inner edges of the horizontal upper cover upper wall portion 223A are provided with horizontal upper cover extension wall portions 223C that extend upward. The lateral upper cover extension wall portions 223C of the left and right upper cover side portions 223 are fastened to the vertical wall portions 225A of the left and right upper cover mounting portions 225 by fastening members such as screws. The lateral upper cover upper wall portions 223A of the left and right upper cover side portions 223 are supported by the upper surfaces of the lateral wall portions 225B of the left and right upper cover mounting portions 225.

[0179] The upper cover front portion 221 and the upper cover rear portion 222 are respectively connected to the left and right upper cover side portions 223. The front ends of the left and right upper cover side portions 223 are connected to the left and right end portions of the upper cover front portion 221. The rear ends of the left and right upper cover side portions 223 are connected to the left and right end portions of the upper cover rear portion 222. As a result, the upper cover front portion 221, the upper cover rear portion 222, and the left and right upper cover side portions 223 are formed in an annular shape centered on the axis A. The front upper cover arc portion 221B, the rear upper cover arc portion 222B, and the left and right lateral upper cover arc portions 223B cooperate with each other to form a cylindrical surface centered on the axis A.

[0180] The front lower cover arc portion 204A, the rear lower cover arc portion 205A, and the left and right lateral lower cover arc portions 206A, and the front upper cover arc portion 221B, the rear upper cover arc portion 222B, and the left and right lateral upper cover arc portions 223B have the same outer diameter. The outer peripheries of the upper cover 202 and the lower cover 201 are formed in a circular shape. This allows the outer shapes of the upper cover 202 and the lower cover 201 to be maintained in a circular shape even when the rotating device 2 rotates.

[0181] The lower end of the upper cover 202 is formed in a circular shape centered on the axis A. The upper end of the lower cover 201 is formed in a circular shape centered on the axis A, and is disposed inside the lower end of the upper cover 202. This allows the outer peripheries of the upper cover 202 and the lower cover 201 to be formed in a circular shape.

[0182] As shown in Figs. 13, 15, 16, and 17, one of the lower cover 201 and the upper cover 202 has a partition wall 230 on its inner side. When viewed from the horizontal direction, the partition wall 230 overlaps with each of the lower cover arc portions 204A, 205A, and 206A and each of the upper cover arc portions 221B, 222B, and 223B. The partition wall 230 eliminates a gap between the upper cover 202 and the lower cover 201. In this embodiment, the lower cover 201 has the partition wall 230. The partition wall 230 is a part of the lower cover 201 and constitutes the upper end portion of the lower cover 201. As a result, when viewed from a radial direction centered on the axis A, the upper end portion of the lower cover 201 and the lower end portion of the upper cover 202 overlap with each other.

[0183] The partition wall 230 is formed in a cylindrical shape centered on the axis A. The outer diameter of the partition wall 230 is smaller than the outer diameter of each of the lower cover arc portions 204A, 205A, and 206A. As a result, the partition wall 230 is disposed inside each of the lower cover arc portions 204A, 205A, and 206A. The partition wall 230 is hidden inside the upper cover 202 and the lower cover 201. The partition wall 230 is disposed along the inner surface of each of the lower cover arc portions 204A, 205A, and 206A. As a result, the partition wall 230 is prevented from being displaced.

[0184] The peeling prevention portions 170 are disposed inside the partition wall 230. As a result, the peeling prevention portions 170 are hidden by the upper cover 202 and the lower cover 201. The units 175 are disposed inside the partition wall 230. The spacer portions 171 are disposed on the axis A side of the lower cover 201.

[0185] An annular flange 231 extending radially inward is provided at the lower end of the partition wall 230. A plurality of reinforcing ribs 232 extending from the partition wall 230 to the flange 231 are provided at the boundary between the partition wall 230 and the flange 231. Each reinforcing rib 232 is formed in a plate shape and extends in the radial direction with the axis A as the center.

[0186] The upper surface of the flange 231 is provided with a plurality of protrusions 234 that can come into contact with the plurality of upper hooks 186. When the rotating part 42 is in the reference rotation position, each protrusion 234 comes into contact with the lower end of the corresponding upper hook 186 from below. This prevents the rotating part 42 from being displaced in the up-down direction relative to the base part 41.

[0187] The flange 231 is disposed outward from the bearing 63. As a result, the convex portion 234 of the flange 231 and the upper hook 186 come into contact with each other on the outer circumferential side of the bearing 63. Therefore, on the outer circumferential side of the bearing 63, vertical displacement of the rotating portion 42 with respect to the base portion 41 can be suppressed.

[0188] The rotating plate 56 is disposed below the upper ends of the support brackets 176 and above the lower ends of the support brackets 176. This brings the rotating plate 56 closer to the base plate 47, enabling the rotating device 2 to be formed compactly. When viewed from above, each of the support brackets 176 overlaps with one of the left and right lower rails 36. Also, a portion of the rotating plate 56 may be disposed below the upper ends of the left and right lower rails 36. This allows the sliding device 4 and the rotating device 2 to be formed compactly.

[0189] A part of the spacer portion 171 may be disposed below the upper end of the lower hook 182 and above the lower end of the upper hook 186. This allows the spacer portion 171 and the peeling suppression portion 170 to be disposed in a well-balanced manner.

[0190] The partition wall 230 and the flange 231 may be formed by combining a plurality of pieces that are divided in the circumferential direction, so that the partition wall 230 and the flange 231 can be attached to the rotation device 2 after the rotation device 2 is assembled.

[0191] As shown in FIG. 17, when the seat cushion 7 is in the high position and the low position, the upper cover 202 of the rotating device cover 200 overlaps with the side cover 21 when viewed from the left and right direction. In detail, when the seat cushion 7 is in the high position and the low position, the upper end of the upper cover 202 is disposed above the lower end of the side cover 21. More specifically, when the seat cushion 7 is in the high position and the low position, the upper ends of the lateral upper cover extension wall portions 223C of the left and right upper cover side portions 223 are disposed above the lower ends of the side cover 21. Also, when viewed from above, the side cover 21 overlaps with the lateral upper cover upper wall portions 223A of the left and right upper cover side portions 223. According to these configurations, even if the seat cushion 7 is raised by the lifting device 110, the rotating device cover 200 overlaps with the side cover 21 when viewed from the left and right direction. Therefore, no gap is formed between the seat cushion 7 and the rotating device cover 200. This makes it possible to prevent entry of foreign objects into the vehicle seat 1 having the rotation device 2 and the lifting device 110.

[0192] The left and right upper cover attachment portions 225 are disposed closer to the axis A of the rotating device 2 than the left and right side covers 21. As a result, the left and right upper cover attachment portions 225 are hidden by the left and right side covers 21.

[0193] A front cover 240 is provided between the front part of the seat cushion 7 and the upper cover 202. The left and right upper cover attachment parts 225 are disposed rearward of the front cover 240. As a result, the upper cover attachment parts 225 are hidden by the front cover 240. The front cover 240 may be coupled to the seat cushion 7 or the upper bracket 57. The front cover 240 extends in the left-right direction and has a width in the up-down direction.

[0194] In the radial direction centered on the axis A, the upper cover attachment portion 225 is disposed outside the separation prevention portion 170. This makes it possible to fix the upper cover 202 to the outer periphery of the rotating portion .

[0195] When viewed from the top-bottom direction, the lower end of the side cover 21 overlaps with the upper cover side portion 223. When the seat cushion 7 is in the high position or the low position, the lower end of the side cover 21 is disposed lower than the upper end of the upper cover side portion 223. In detail, when viewed from the top-bottom direction, the lower end of the side cover 21 overlaps with the lateral upper cover upper wall portion 223A. When the seat cushion 7 is in the high position or the low position, the lower end of the side cover 21 is disposed lower than the upper end of the lateral upper cover extension wall portion 223C.

[0196] Although the description of the specific embodiment is finished above, the present invention is not limited to the above embodiment and can be widely modified. For example, the bearing 63 is not limited to a ball bearing, and various known bearings can be applied. The bearing 63 may be, for example, a roller bearing.

[0197] The positional relationship of the side cover 21 with respect to the rotating device 2 and the sliding device 4 may be changed as appropriate. For example, the left and right outer ends of the side cover 21 may be disposed more inward than the outer ends of the left and right lower rails 36 when viewed from above. Also, the left and right outer ends of the side cover 21 may be disposed more inward than the left and right outer ends of the upper cover 202 when viewed from above. In this case, the upper end of the upper cover 202 may be disposed so as to cover the lower end of the side cover 21. The left and right outer ends of the upper cover 202 and the lower cover 201 may be disposed more inward than the outer ends of the left and right lower rails 36.

[0198] 18, the lower end of the side cover 21 may be disposed inside the lateral upper cover arc portion 223B of the upper cover side portion 223 in the left-right direction. The lower end of the side cover 21 may face the lateral upper cover upper wall portion 223A in the up-down direction. In this case, a lateral upper cover outer wall portion 223D may be provided protruding upward from the upper end of the lateral upper cover arc portion 223B. The upper end of the lateral upper cover outer wall portion 223D may be disposed above the lower end of the side cover 21. When viewed from the left-right direction, the lateral upper cover outer wall portion 223D fills the gap between the side cover 21 and the upper cover side portion 223.

[0199] 19, the lower end of the side cover 21 may be provided above the lateral upper cover arc portion 223B of the upper cover side portion 223. In this case, a recess 223E recessed downward may be formed at the upper end of the lateral upper cover arc portion 223B. In addition, an extension wall 21A extending downward may be provided at the lower end of the side cover 21. The lower end of the extension wall 21A may protrude into the recess 223E and be positioned lower than the lateral upper cover upper wall portion 223A. When viewed from the left-right direction, the extension wall 21A of the side cover 21 fills the gap between the side cover 21 and the upper cover side portion 223.

[0200] A recess may be formed on the side surface of the center console or door trim of the vehicle facing the vehicle seat to avoid the left and right outer ends of the upper cover 202 and the lower cover 201. A part of the left and right outer ends of the upper cover 202 and the lower cover 201 may protrude into the recess. The recess may extend in the front-rear direction.

[0201] The partition wall 230 may be divided into a plurality of parts and disposed intermittently on a circumference centered on the axis A. In other words, the shape of the partition wall 230 is not limited to annular. [Explanation of symbols]

[0202] 1: Vehicle seats 2: Rotating device 3: Seat body 7: Seat cushion 21: Side cover 41: Base section 42: Rotating part 46: Lower bracket 47: Base plate 63: Bearings 110: Lifting device 170: Peel prevention section 171: Spacer part 175: Unit 176: Support bracket 182: Lower hook 183: Upper unit 186: Upper hook 188: Inclined surface 200: Rotating device cover 201: Lower cover 202: Upper cover 204: Lower cover front 204A: Front lower cover arc section 205: Rear of lower cover 206: Lower cover side 211: Front lower cover mounting part 217: Rear lower cover mounting part 219: Horizontal lower cover mounting part 221: Front upper cover 222: Rear upper cover 223: Upper cover side 225: Upper cover mounting part 230: Partition wall 231: Flange 240: Front cover A: Axis line C: Virtual circle

Claims

1. A vehicle seat, comprising: A seat body having a seat cushion; a rotation device provided between a floor and the seat cushion and configured to rotatably support the seat cushion about a rotation axis extending in a vertical direction; the rotation device includes a base portion and a rotation portion supported on the base portion so as to be rotatable about the rotation axis; a plurality of spacer portions that suppress the approach of the rotating portion to the base portion and a plurality of biasing portions that bias the rotating portion toward the base portion are provided between an outer periphery of the base portion and an outer periphery of the rotating portion, A vehicle seat, wherein the plurality of spacer portions and the plurality of biasing portions are arranged on an imaginary circle centered on the axis of rotation.

2. A plurality of support brackets are provided on the base portion, 2. The vehicle seat according to claim 1, wherein each of the plurality of support brackets is provided with at least one of the spacer portions and at least one of the biasing portions.

3. a peeling prevention portion is provided between an outer periphery of the base portion and an outer periphery of the rotating portion, The vehicle seat according to claim 2, wherein the peeling prevention portion has a lower hook protruding upward from an edge portion of the support bracket, and an upper hook protruding downward from the rotating portion and facing the lower hook from below across a gap.

4. the lower hook is disposed outside the imaginary circle; 4. The vehicle seat according to claim 3, wherein one of the spacer portion and the biasing portion is disposed on a radial line extending from the rotation axis to the lower hook.

5. 5. The vehicle seat according to claim 4, wherein in each of the support brackets, one of the biasing portions is disposed between two of the spacer portions.

6. The base portion is supported on the floor via left and right slide devices, the base portion includes lower brackets coupled to the left and right slide devices and a base plate supported by the lower brackets, the rotating portion includes a rotating plate rotatably supported by the base plate and an upper bracket coupled to the rotating plate, The upper bracket is coupled to an upper surface of the rotating plate and is also coupled to the seat body, the plurality of spacer portions and the plurality of biasing portions are disposed between the lower bracket and the upper bracket, 3. The vehicle seat according to claim 2, wherein the rotation plate is disposed below an upper end of the support bracket and above a lower end of the support bracket.

7. When viewed from above, each of the support brackets overlaps with one of the left and right slide devices, 7. The vehicle seat according to claim 6, wherein a portion of the rotating plate is disposed lower than upper ends of the left and right sliding devices.

8. 2. The vehicle seat of claim 1, wherein the biasing portion comprises a locking piece protruding downward from the rotating portion, a support shaft protruding upward from the base portion, a contact piece supported on the support shaft so as to be movable in the vertical direction and abutting against the locking piece from above, and a biasing member provided between the support shaft and the contact piece for biasing the contact piece downward.

9. the spacer portion has a roller rotatably supported by the support bracket, 3. The vehicle seat according to claim 2, wherein the roller is in contact with the rotating portion.

10. 4. The vehicle seat according to claim 3, wherein a portion of the spacer portion is disposed below an upper end of the lower hook and above a lower end of the upper hook.

11. The seat body includes a seat back provided at a rear portion of the seat cushion via a reclining device, and a headrest provided at an upper portion of the seat back, 2. The vehicle seat according to claim 1, wherein the reclining device is capable of arbitrarily adjusting an inclination angle of the seat back relative to the seat cushion.

Images