Vehicle seat

Abstract

To suppress the displacement of a sliding member in a seat device for vehicle.SOLUTION: A seat (1) for vehicle includes a rotation device (2) which is provided between a floor (5) and a seat cushion (11), and supports the seat cushion such that the seat cushion can rotate relative to the floor. The rotation device has a base part (51) provided on the floor, and a rotary part (52) provided on the seat cushion and rotatably supported on the base part, The base part has a base plate (55) with the surface facing upwards and downwards, and a fixed member (66) extending upwards from the base plate. The rotary part has a rotor plate (71) that is rotatably supported on the upper surface of the base plate through a bearing (77). At the upper end of the fixed member, a flange part (68) facing the upper surface of the rotor plate through the sliding member (85) is provided. The sliding member is arranged radially outward of the rotor plate with respect to the bearing, and has a locking part 87 that is locked to a locking hole 89 formed in the rotor plate.SELECTED DRAWING: Figure 8

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 device has a base member that is attached to the floor via a slide device, a rotating member that is attached to a seat cushion and rotatably supported on the base portion, and an electric actuator that rotates the rotating member relative to the base member. The rotating member is rotatably supported on the upper surface of the base member via a ball. A fixed member (cover member) fixed to the base member extends above the rotating member and faces the rotating member via an annular sliding member, suppressing detachment of the rotating member from the base member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-132093 A Summary of the Invention [Problem to be solved by the invention]

[0004] When the sliding contact member receives a load from the rotating member and the cover member, the sliding contact member may become misaligned with respect to the rotating member and the cover member. If the sliding contact member becomes misaligned, the rotational resistance of the rotating member increases, and there is a risk that the smooth rotation of the rotating member may be hindered.

[0005] In view of the above background, an object of the present invention is to suppress displacement of a sliding contact member in a vehicle seat device. [Means for solving the problem]

[0006] In order to solve the above problem, one aspect of the present invention is a vehicle seat (1), comprising a rotation device (2) provided between a floor (5) and a seat cushion (11) and rotatably supporting the seat cushion with respect to the floor, the rotation device comprising a base portion (51) provided on the floor and a rotation portion (52) provided on the seat cushion and rotatably supported on the base portion, the base portion comprising a base plate (55) whose surface faces in the vertical direction and a fixed member (66) extending upward from the base plate, the rotation portion comprising a rotating plate (71) rotatably supported on an upper surface of the base plate via a bearing (77), a flange portion (68) facing an upper surface of the rotating plate via a sliding member (85) is provided at an upper end of the fixed member, and the sliding member has a locking portion (87) disposed radially outward of the rotating plate relative to the bearing and projecting into a locking hole (89) formed in the rotating plate.

[0007] According to this aspect, the locking portion of the sliding contact member is inserted into the locking hole of the rotating plate, thereby fixing the sliding contact member to the rotating plate, thereby making it possible to suppress displacement of the sliding contact member in the vehicle seat device.

[0008] In the above aspect, the bearing may include a plurality of balls (78) and a retainer (79) that supports the balls, and the engaging portion may overlap with the balls when viewed from a radial direction of the rotating plate.

[0009] According to this aspect, the thickness of the rotating device in the vertical direction can be reduced.

[0010] In the above aspect, the rotating plate is concave upward and has a bearing groove (81) that extends annularly in the circumferential direction about the rotation axis of the rotating plate and accommodates the bearing, and the sliding contact member may be positioned radially outward of the rotating plate relative to the bearing groove.

[0011] According to this aspect, the bearing groove and the sliding contact member do not overlap when viewed from the top-bottom direction, so that the thickness of the rotating device in the top-bottom direction can be reduced.

[0012] In the above aspect, the sliding member has a ring portion (86) extending in a circular ring shape centered on the rotation axis of the rotating plate, and the locking portions are provided on a lower surface of the ring portion, the lower surface of the ring portion abuts against the rotating plate, and the upper surface of the ring portion is in sliding contact with the lower surface of the flange portion.

[0013] According to this aspect, contact between the rotating plate and the flange portion is avoided over the entire circumference of the rotating plate.

[0014] In the above aspect, an upper surface of the ring portion may be inclined downward toward an outer side in a radial direction of the rotary plate.

[0015] According to this aspect, the contact area between the upper surface of the sliding member and the flange portion is reduced, and the rotational resistance of the rotating plate is reduced. On the other hand, when the rotating plate is inclined relative to the base plate and the fixed member, the contact area between the upper surface of the sliding member and the flange portion is increased, and the fixed member can stably hold the rotating plate.

[0016] In the above aspect, the ring portion may have a thickness in a vertical direction that decreases radially outward of the rotary plate.

[0017] According to this aspect, the contact area between the upper surface of the sliding member and the flange portion is reduced, and the rotational resistance of the rotating plate is reduced. On the other hand, when the rotating plate is inclined relative to the base plate and the fixed member, the contact area between the upper surface of the sliding member and the flange portion is increased, and the fixed member can stably hold the rotating plate.

[0018] In the above aspect, the locking hole may pass through the rotating plate in the up-down direction, and the locking portion may pass through the locking hole and protrude below the locking hole.

[0019] According to this aspect, the locking portion is less likely to slip out of the locking hole, and the sliding contact member is fixed to the rotating plate with good stability.

[0020] In the above aspect, the plurality of locking portions may include a first locking portion (87A) that passes through the locking hole and has a claw portion that is locked to a lower edge of the locking hole.

[0021] According to this aspect, the locking portion is less likely to slip out of the locking hole, and the sliding contact member is fixed to the rotating plate with good stability.

[0022] In the above aspect, the rotary plate may have a plurality of second locking portions (87B) extending in the circumferential direction centered on the rotation axis of the rotary plate.

[0023] According to this aspect, the locking portion is less likely to slip out of the locking hole, and the sliding contact member is fixed to the rotating plate with good stability.

[0024] In the above aspect, the rotating plate may have a convex portion (72) above the bearing groove, extending in the shape of a ring centered on the rotation axis of the rotating plate, and the upper surface of the ring portion may be positioned below the upper end of the convex portion.

[0025] According to this aspect, the thickness of the rotating device in the vertical direction can be reduced. Effect of the Invention

[0026] In order to solve the above problem, one aspect of the present invention is a vehicle seat (1), comprising a rotation device (2) provided between a floor (5) and a seat cushion (11) and rotatably supporting the seat cushion with respect to the floor, the rotation device comprising a base portion (51) provided on the floor and a rotation portion (52) provided on the seat cushion and rotatably supported on the base portion, the base portion comprising a base plate (55) whose surface faces in the vertical direction and a fixed member (66) extending upward from the base plate, the rotation portion comprising a rotating plate (71) rotatably supported on an upper surface of the base plate via a bearing (77), a flange portion (68) facing an upper surface of the rotating plate via a sliding member (85) is provided at an upper end of the fixed member, and the sliding member has a locking portion (87) disposed radially outward of the rotating plate relative to the bearing and projecting into a locking hole (89) formed in the rotating plate.

[0027] According to this aspect, the locking portion of the sliding contact member is inserted into the locking hole of the rotating plate, thereby fixing the sliding contact member to the rotating plate, thereby making it possible to suppress displacement of the sliding contact member in the vehicle seat device.

[0028] In the above aspect, the bearing may include a plurality of balls (78) and a retainer (79) that supports the balls, and the engaging portion may overlap with the balls when viewed from a radial direction of the rotating plate.

[0029] According to this aspect, the thickness of the rotating device in the vertical direction can be reduced.

[0030] In the above aspect, the rotating plate is concave upward and has a bearing groove (81) that extends annularly in the circumferential direction about the rotation axis of the rotating plate and accommodates the bearing, and the sliding contact member may be positioned radially outward of the rotating plate relative to the bearing groove.

[0031] According to this aspect, the bearing groove and the sliding contact member do not overlap when viewed from the top-bottom direction, so that the thickness of the rotating device in the top-bottom direction can be reduced.

[0032] In the above aspect, the sliding member has a ring portion (86) extending in a circular ring shape centered on the rotation axis of the rotating plate, and the locking portions are provided on a lower surface of the ring portion, the lower surface of the ring portion abuts against the rotating plate, and the upper surface of the ring portion is in sliding contact with the lower surface of the flange portion.

[0033] According to this aspect, contact between the rotating plate and the flange portion is avoided over the entire circumference of the rotating plate.

[0034] In the above aspect, an upper surface of the ring portion may be inclined downward toward an outer side in a radial direction of the rotary plate.

[0035] According to this aspect, the contact area between the upper surface of the sliding member and the flange portion is reduced, and the rotational resistance of the rotating plate is reduced. On the other hand, when the rotating plate is inclined relative to the base plate and the fixed member, the contact area between the upper surface of the sliding member and the flange portion is increased, and the fixed member can stably hold the rotating plate.

[0036] In the above aspect, the ring portion may have a thickness in a vertical direction that decreases radially outward of the rotary plate.

[0037] According to this aspect, the contact area between the upper surface of the sliding member and the flange portion is reduced, and the rotational resistance of the rotating plate is reduced. On the other hand, when the rotating plate is inclined relative to the base plate and the fixed member, the contact area between the upper surface of the sliding member and the flange portion is increased, and the fixed member can stably hold the rotating plate.

[0038] In the above aspect, the locking hole may pass through the rotating plate in the up-down direction, and the locking portion may pass through the locking hole and protrude below the locking hole.

[0039] According to this aspect, the locking portion is less likely to slip out of the locking hole, and the sliding contact member is fixed to the rotating plate with good stability.

[0040] In the above aspect, the plurality of locking portions may include a first locking portion (87A) that passes through the locking hole and has a claw portion that is locked to a lower edge of the locking hole.

[0041] According to this aspect, the locking portion is less likely to slip out of the locking hole, and the sliding contact member is fixed to the rotating plate with good stability.

[0042] In the above aspect, the rotary plate may have a plurality of second locking portions (87B) extending in the circumferential direction centered on the rotation axis of the rotary plate.

[0043] According to this aspect, the locking portion is less likely to slip out of the locking hole, and the sliding contact member is fixed to the rotating plate with good stability.

[0044] In the above aspect, the rotating plate may have a convex portion (72) above the bearing groove, extending in the shape of a ring centered on the rotation axis of the rotating plate, and the upper surface of the ring portion may be positioned below the upper end of the convex portion.

[0045] According to this aspect, the thickness of the rotating device in the vertical direction can be reduced. [Brief description of the drawings]

[0046] [Figure 1] FIG. 1 is a perspective view of a seat according to an embodiment; [Diagram 2] Plan view of the rotating device [Diagram 3] Bottom view of the rotating device [Figure 4] FIG. 1 is a plan view of a rotating device with the rotating plate omitted. [Diagram 5] Bottom view of the rotating plate with the reinforcement plate attached [Figure 6] FIG. 1 is a plan view of a rotating plate with a sliding contact member attached thereto; [Figure 7] Exploded perspective view of the rotating device [Figure 8] Cross-section of a rotating device [Figure 9] Cross-section of a rotating device [Figure 10] A perspective view of a rotation lock device DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0047] Hereinafter, an embodiment in which the rotation device 2 according to the present invention is applied to an automobile seat will be described with reference to the drawings. In other embodiments, the rotation device 2 may be applied to seats of other vehicles such as trains, airplanes, ships, etc. Hereinafter, the front-rear, left-right, and up-down directions are defined based on the automobile.

[0048] As shown in FIG. 1, the vehicle seat device 1 has a rotation device 2. The vehicle seat device 1 also has a seat body 3 and a slide device 4. The rotation device 2 is provided on a floor 5 via the slide device 4. The seat body 3 has a seat cushion 11 and a seat back 12. The seat cushion 11 supports the buttocks of a user from below. The seat back 12 extends upward from the rear of the seat cushion 11. The seat back 12 supports the back of the user from behind.

[0049] The seat cushion 11 has a seat cushion frame 14 forming a skeleton, a pad supported by the seat cushion frame 14, and a skin material covering the surface of the pad. The seat cushion frame 14 has left and right seat cushion side members 18 extending in the front-rear direction, a front member 19 extending left and right and connected to the front ends of the left and right seat cushion side members 18, and a rear member 21 extending left and right and connected to the rear ends of the left and right seat cushion side members 18. A flexible support member 22 supporting the buttocks of a user is stretched between the front member 19 and the rear member 21. The support member 22 may have a plurality of metal wires and flexible resin plates connected to the respective wires. Side covers 23 are provided on the left and right side portions of the seat cushion 11. The side covers 23 are supported by the seat cushion side members 18 and hide the ends of the pad and the skin material. The side covers 23 may be formed of a resin material.

[0050] The seat back 12 has a seat back frame 25 forming a skeleton, a pad supported by the seat back frame 25, and a skin material covering the surface of the pad. The seat back frame 25 has left and right seat back side members 29 extending vertically, an upper member 31 extending horizontally and connected to the upper ends of the left and right seat back side members 29, a lower member 32 extending horizontally and connected to the lower ends of the left and right seat back side members 29, and an intermediate member 33 extending horizontally between the upper member 31 and the lower member 32 and connected to the left and right seat back side members 29. The left and right seat back side members 29, the upper member 31, the lower member 32, and the intermediate member 33 are formed by bending and forming a metal plate. A flexible support member 34 that supports the back of the user is stretched across the left and right seat back side members 29, the intermediate member 33, and the lower member 32. 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 29 are connected to the rear ends of the corresponding seat cushion side members 18 via reclining devices 35 .

[0051] As shown in Figs. 1 to 3, the slide device 4 has left and right lower rails 37 extending forward and backward, and left and right upper rails 38 supported on the lower rails 37 so as to be slidable forward and backward. Each lower rail 37 is coupled to the floor 5 via front and rear feet 39. A slide lock device (not shown) is provided between each lower rail 37 and the corresponding upper rail 38. The left and right slide lock devices are connected to each other by a slide operation lever 41 extending left and right. A user can operate the slide operation lever 41 to make the upper rail 38 slidable relative to the lower rail 37.

[0052] 1 to 3, the rotation device 2 is provided between a floor 5 and a seat cushion 11, and supports the seat cushion 11 rotatably about a first axis A (rotation axis) relative to the floor 5. The rotation device 2 has a base portion 51, a rotating portion 52, a rotation actuator 53, and a rotation lock device 54.

[0053] The base portion 51 is provided on the floor 5 side. In this embodiment, the base portion 51 is provided on the floor 5 via the slide device 4. The base portion 51 has a base plate 55 whose surface faces the up-down direction. The base plate 55 is in the shape of a circular plate. The base portion 51 also has a standing wall 56 that protrudes upward from the edge of the base plate 55. The base plate 55 is supported by the left and right upper rails 38 via a pair of front and rear cross members 57. Each cross member 57 extends left and right, and both ends are connected to the left and right upper rails 38. Both left and right ends of the front cross member 57 are connected to the front ends of the corresponding upper rails 38 on the left and right. Both left and right ends of the rear-front cross member 57 are connected to the rear ends of the corresponding upper rails 38 on the left and right.

[0054] 2 and 3, the front and rear cross members 57 are disposed at a distance from each other in the front and rear. The base plate 55 and the front and rear cross members 57 may be formed of metal plates. A plurality of reinforcing structures extending in the left-right direction may be formed in the center of each cross member 57.

[0055] As shown in FIG. 3, the front and rear cross members 57 are connected to each other by a base plate 55 .

[0056] As shown in Fig. 3 and Figs. 7 to 9, a first bulging portion 61 bulging downward is formed in the center of the base plate 55. The first bulging portion 61 is formed in a cylindrical shape with a bottom. A circular first bearing hole 62 penetrating through the first bulging portion 61 in the thickness direction is formed in the center of the first bulging portion 61. The first bearing hole 62 is centered on a first axis A extending vertically. It is preferable that an annular edge wall 63 protruding upward or downward is formed on the edge of the first bearing hole 62 (see Fig. 8).

[0057] As shown in FIG. 2 and FIG. 7 to FIG. 9, the base portion 51 further includes a fixing member 66 extending upward from the base plate 55. The fixing member 66 includes a cylindrical tube wall 67 extending upward from the base plate 55, and an inner flange portion 68 extending radially inward from the upper end of the tube wall 67. The inner flange portion 68 is formed in an annular shape, and its surface faces up and down. The outer peripheral surface of the tube wall 67 may be disposed inside the inner peripheral surface of the standing wall 56 of the base plate 55. The fixing member 66 may be joined to the base plate 55, for example, by welding the lower part of the outer peripheral surface of the tube wall 67 of the fixing member 66 to the upper part of the inner peripheral surface of the standing wall 56 of the base plate 55. A gap is formed between the inner flange portion 68 and the base plate 55. The fixing member 66 may be formed by combining a plurality of members. A plurality of reinforcing structures may be provided at the boundary between the tube wall 67 and the inner flange portion 68. The reinforcing structures may be, for example, recesses, ribs, or the like.

[0058] As shown in Figs. 2 to 9, the rotating part 52 is provided on the seat cushion 11 and rotatably supported by the base part 51. The rotating part 52 has a rotating plate 71 rotatably supported on the upper surface of the base plate 55. The rotating plate 71 is formed in a disk shape with its surface facing up and down. The rotating plate 71 is formed of a metal plate. The central part of the rotating plate 71 has a second bulging part 72 that forms a convex part bulging upward. The second bulging part 72 extends in an annular shape centered on the first axis A. The inner peripheral edge of the second bulging part 72 defines a circular second bearing hole 73 that penetrates through the center of the rotating plate 71 in the thickness direction. The second bearing hole 73 is centered on the first axis A. The inner peripheral edge of the second bulging part 72 may have an annular edge wall 74 that protrudes upward or downward (see Fig. 8).

[0059] As shown in Figs. 2 and 6, the rotating plate 71 further has a plurality of third bulging portions 75 bulging upward. The third bulging portions 75 may be formed integrally with the second bulging portion 72. Specifically, the third bulging portions 75 are provided so as to protrude radially outward from the outer periphery of the second bulging portion 72. In this embodiment, four third bulging portions 75 are disposed at equal intervals in the circumferential direction of the second bulging portion 72. On the upper surfaces of the third bulging portions 75, corresponding bolts 76 extending upward are provided. The bolts 76 may be stud bolts.

[0060] 8 and 9, the upper surface of the peripheral portion of the rotating plate 71 faces the lower surface of the inner flange portion 68. Specifically, the peripheral portion of the rotating plate 71 is disposed in the gap formed between the inner flange portion 68 of the fixed member 66 and the base plate 55.

[0061] As shown in Figs. 7 to 9, the rotating plate 71 is supported on the upper surface of the base plate 55 via a bearing 77. In this embodiment, the bearing 77 is a known thrust bearing having a plurality of balls 78 and an annular retainer 79 that rotatably supports the plurality of balls 78. The retainer 79 is annular about the first axis A. The bearing 77 is disposed between the upper surface of the outer periphery of the base plate 55 and the lower surface of the outer periphery of the rotating plate 71. Specifically, the retainer 79 is disposed radially outward of the rotating plate 71 from the third bulging portion 75 when viewed from above, and radially inward of the rotating plate 71 from the inner peripheral edge of the inner flange portion 68 of the fixing member 66.

[0062] The rotating plate 71 has a first bearing groove 81 that is recessed upward and extends annularly in the circumferential direction about the first axis A of the rotating plate 71 to accommodate the bearing 77. The first bearing groove 81 is recessed upward from the lower surface of the outer periphery of the rotating plate 71. In addition, a second bearing groove 82 that is recessed downward to receive the lower part of the bearing 77 may be formed in the upper surface of the outer periphery of the base plate 55. A space 84 is formed between the first bulge 61 of the base plate 55 and the second bulge 72 of the rotating plate 71.

[0063] As shown in FIG. 5 and FIG. 7 to FIG. 9, the rotating plate 71 is provided with a sliding member 85 that is in sliding contact with the inner flange portion 68 of the fixed member 66. The sliding member 85 is made of a resin material that has a smaller friction coefficient than metal. The sliding member 85 is disposed radially outward of the rotating plate 71 than the bearing 77. That is, the sliding member 85 is disposed radially outward of the rotating plate 71 than the first bearing groove 81. The sliding member 85 has a ring portion 86 that extends in an annular shape centered on the first axis A of the rotating plate 71, and a plurality of locking portions 87 provided on the lower surface of the ring portion 86. The surface of the ring portion 86 faces the vertical direction. The upper surface of the ring portion 86 is in sliding contact with the lower surface of the inner flange portion 68 of the fixed member 66. The ring portion 86 has a thickness in the vertical direction that decreases toward the radially outward direction of the rotating plate 71. That is, the upper surface of the ring portion 86 is preferably inclined downward toward the radially outward direction of the rotating plate 71. The lower surface of the ring portion 86 abuts against the rotating plate 71. Since the ring portion 86 is disposed around the entire circumference of the rotating plate 71, contact between the rotating plate 71 and the inner flange portion 68 is avoided. The sliding contact member 85 may be divided into a plurality of members.

[0064] The locking portion 87 protrudes downward from the lower surface of the ring portion 86. The locking portion 87 has a plurality of first locking portions 87A and a plurality of second locking portions 87B. The first locking portions 87A form a pair, one in front and one in back, and are provided at the front and rear portions of the ring portion 86, respectively. The lower end of the first locking portion 87A may be provided with a claw portion 88 extending radially inward of the rotating plate 71. The second locking portions 87B may be disposed at equal intervals in the circumferential direction of the ring portion 86. In this embodiment, three second locking portions 87B are disposed on each of the left and right sides of the first locking portion 87A.

[0065] The rotating plate 71 has corresponding locking holes 89 for receiving the respective locking portions 87A, 87B of the sliding contact member 85. The locking holes 89 penetrate the rotating plate 71 in the up-down direction. Each of the locking portions 87A, 87B enters the corresponding locking hole 89 from above and protrudes below the locking hole 89. A claw portion 88 provided at the lower end of the first locking portion 87A is locked to the lower edge of the corresponding locking hole 89. The second locking portion 87B may be fitted into the corresponding locking hole 89. In this way, the sliding contact member 85 is attached to the rotating plate 71.

[0066] When the sliding contact member 85 is attached to the rotating plate 71, the locking portion 87 overlaps with the bearing 77 when viewed from the radial direction of the rotating plate 71. Also, the upper surface of the ring portion 86 is disposed lower than the upper end, i.e., the upper surface, of the second bulging portion 72. The rotating plate 71 may be provided with an annular receiving groove recessed downward to receive the ring portion 86.

[0067] The inner flange portion 68 of the fixing member 66 may press the rotating plate 71 toward the base plate 55 via the sliding contact member 85. This prevents the rotating plate 71 from being displaced upward.

[0068] As shown in FIG. 7, the rotating portion 52 further has a fixed bracket 91 that connects the rotating plate 71 and the seat cushion frame 14. The fixed bracket 91 is formed in a plate shape with its surfaces facing up and down. The fixed bracket 91 may be connected to the left and right seat cushion side members 18. An opening 93 that penetrates vertically is formed in the center of the fixed bracket 91. Fastening holes 94 are formed around the opening 93, corresponding to the bolts 76 provided in the third bulging portion 75, through which the bolts 76 pass. The rotating plate 71 and the fixed bracket 91 are fastened to each other by attaching nuts to each bolt 76.

[0069] As shown in Figs. 7 to 9, a support tube 101 extending vertically is inserted into the first bearing hole 62 and the second bearing hole 73. The support tube 101 is a cylinder with both upper and lower ends open. The support tube 101 is made of metal. An annular rib 102 bulging outward is formed on the outer periphery of the support tube 101. The first bearing hole 62 of the base plate 55 is disposed below the annular rib 102. A cylindrical bush 103 is attached to the edge of the second bearing hole 73 of the rotating plate 71. The bush 103 is supported by a portion of the support tube 101 above the annular rib 102. The support tube 101 is rotatably supported by the second bearing hole 73 of the rotating plate 71 via the bush 103. The support tube 101 positions the base plate 55 and the rotating plate 71 on the first axis A.

[0070] The rotary actuator 53 rotates the rotary plate 71 relative to the base plate 55. As shown in FIG. 3 and FIG. 8, the rotary actuator 53 is attached to the lower surface of the base plate 55. The rotary actuator 53 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 71. The pinion 115 and the gear 116 are spur gears. The gear 116 is a gear centered on the first axis A. The gear 116 is coupled to the lower surface of the rotary plate 71 via a spacer 117 and is disposed in the space 84. The number of teeth of the gear 116 is greater than the number of teeth of the pinion 115.

[0071] The rotary actuator 53 may be coupled to the lower surface of the base plate 55. An output shaft 113 of the rotary actuator 53 extends upward from the reduction mechanism 112. The output shaft 113 passes through a through hole 119 formed in the base plate 55 and extends into the space 84. A pinion 115 coupled to the output shaft 113 is disposed in the space 84 and meshes with a gear 116. The electric motor 111 and the reduction mechanism 112 are disposed below the base plate 55.

[0072] The rotation lock device 54 selectively prohibits the rotation of the rotating plate 71 relative to the base plate 55. As shown in Figures 3, 9 and 10, the rotation lock device 54 is attached to the lower surface of the base plate 55. The rotation lock device 54 may have a known configuration having, for example, a holder 122 provided on the lower surface of the base plate 55, a lock claw 121 rotatably supported by the holder 122, and an unlock actuator 151 that rotates the lock claw 121. The lock claw 121 is supported by the holder 122 rotatably about the second axis B.

[0073] 4 and 9, the base plate 55 is formed with an insertion hole 131 that penetrates in the vertical direction and through which the lock claw 121 can pass. The rotating plate 71 is formed with a plurality of lock holes 132 with which the lock claw 121 can selectively engage. The lock holes 132 are preferably arranged at 90 degree intervals from one another about the first axis A. The lock holes 132 are preferably arranged between the third bulging portions 75. When the rotating plate 71 is in a predetermined rotational position with respect to the base plate 55, the insertion hole 131 faces one of the plurality of lock holes 132.

[0074] As shown in FIG. 5 and FIG. 7 to FIG. 9, a reinforcing plate 141 is joined to the lower surface of the rotating plate 71. The reinforcing plate 141 has a surface facing up and down and extends in the circumferential direction centered on the first axis A. The reinforcing plate 141 may be formed by dividing an annular member centered on the first axis A. In this embodiment, four reinforcing plates 141 are arranged. The central portion of the reinforcing plate 141 may face the corresponding lock hole 132. Both ends in the circumferential direction of the reinforcing plate 141 may cover the opening of the third bulging portion 75. The reinforcing plate 141 may be attached to the rotating plate 71 by fasteners such as bolts and nuts. Alternatively, the reinforcing plate 141 may be welded and joined to the rotating plate 71. The thickness of the reinforcing plate 141 may be formed thicker than the thickness of the rotating plate 71. The reinforcing plate 141 increases the section modulus and the second moment of area around each lock hole 132 of the rotating plate 71. As shown in FIG. 5, the reinforcing plate 141 has a through hole 142 formed in the center thereof, the through hole 142 facing each of the lock holes 132 .

[0075] As shown in Fig. 9, the locking claw 121 is displaced between a locked position where it engages with the rotating plate 71 and an unlocked position where it is separated from the rotating plate 71. At the locked position, the locking claw 121 passes through the insertion hole 131 and fits into one of the multiple locking holes 132 and the corresponding through-holes 142. As shown in Fig. 10, a biasing member 134 that biases the locking claw 121 toward the locked position is provided between the locking claw 121 and the holder 122. The biasing member 134 may be a tension coil spring.

[0076] The lock release actuator 151 moves the lock claw 121 from the locked position to the unlocked position. As shown in Figs. 9 and 10, the lock release actuator 151 has an electric motor 152, a speed reduction mechanism 153, and an arm 154 provided on the output shaft of the speed reduction mechanism 153. The arm 154 engages with the lock claw 121. When the electric motor 152 is driven, the arm 154 rotates against the biasing force of the biasing member 134, and the arm 154 moves the lock claw 121 from the locked position to the unlocked position. When the electric motor 152 stops, the biasing force of the biasing member 134 moves the lock claw 121 from the unlocked position to the locked position.

[0077] In addition, in other embodiments, the rotation lock device 54 may be changed between the locked state and the unlocked state by manual operation by the user.

[0078] 2, a plurality of base side peeling prevention units 161 may be provided on the upper surfaces of the front and rear cross members 57. The base side peeling prevention units 161 may be of a known configuration having, for example, a first base side hook 163 and a second base side hook 164.

[0079] A plurality of rotation-side peeling prevention units may be provided on the underside of the fixed bracket 91. The rotation-side peeling prevention units may be of a known configuration having, for example, a rotation-side hook that faces the first base-side hook 163 at a vertical interval, and a locking piece that faces the second base-side hook 164 at a vertical interval.

[0080] When a load is applied to the sheet main body 3, the first base side hook 163 of the base side peeling prevention unit 161 and the rotation side hook of the corresponding rotation side peeling prevention unit engage with each other, preventing peeling of the rotating part 52 from the base part 51. Furthermore, when a further load is applied to the sheet main body 3, the second base side hook 164 of the base side peeling prevention unit 161 and the locking piece of the corresponding rotation side peeling prevention unit engage with each other, preventing peeling of the rotating part 52 from the base part 51.

[0081] Next, a manufacturing method of the vehicle seat device 1 will be described. First, the support tube 101 is bulged to form the annular rib 102. Next, the bush 103 is attached to the second bearing hole 73 of the rotating plate 71, and the gear 116 is coupled thereto. After that, the support tube 101 is inserted into the second bearing hole 73. In this manner, the rotating plate 71 is rotatably supported by the support tube 101.

[0082] Next, the base plate 55, the bearing 77, and the rotating plate 71 are arranged one on top of the other, and the fixing member 66 is arranged on the outer periphery of the base plate 55 and the rotating plate 71. First, the sliding member 85 is attached to the rotating plate 71. Specifically, after each locking portion 87A, 87B of the sliding member 85 passes through the corresponding locking hole 89, the claw portion 88 provided at the lower end of the first locking portion 87A is locked to the lower edge of the corresponding locking hole 89. This makes it difficult for the locking portion 87 to come out of the locking hole 89, and the sliding member 85 is stably fixed to the rotating plate 71. Next, the lower portion of the support tube 101 is inserted into the first bearing hole 62 of the base plate 55. At this time, the bearing 77 is interposed between the rotating plate 71 and the base plate 55. Next, the fixing member 66 is joined to the base plate 55. Specifically, it is preferable that the lower portion of the outer periphery of the fixing member 66 and the upper portion of the inner periphery of the standing wall 56 of the base plate 55 are welded to each other. At this time, the lower surface of the inner flange portion 68 abuts against the upper surface of the sliding contact member 85. In this manner, the base plate 55, the bearing 77, the rotating plate 71, the fixed member 66, and the sliding contact member 85 are assembled.

[0083] Next, the rotation actuator 53 is attached to the base plate 55, and the pinion 115 and the gear 116 mesh with each other. In addition, the rotation lock device 54 including the lock release actuator 151 is attached to the base plate 55. In this manner, the rotation device 2 is assembled.

[0084] Thereafter, the front and rear cross members 57 are joined to the left and right upper rails 38 of the slide device 4 provided on the floor 5. Then, the seat body 3 is attached to the fixing bracket 91. In this manner, the vehicle seat device 1 is assembled.

[0085] Since the sliding contact member 85 is fixed to the rotating plate 71 in this manner, it is possible to suppress deviation of the sliding contact member 85. Since the locking portion 87 overlaps with the bearing 77 when viewed from the radial direction of the rotating plate 71, it is possible to suppress the thickness in the vertical direction of the rotating device 2. Furthermore, since the sliding contact member 85 does not overlap with the first bearing groove 81 when viewed from the vertical direction and is disposed below the upper surface of the second bulging portion 72, it is possible to further suppress the thickness in the vertical direction of the rotating device 2.

[0086] The upper surface of the ring portion 86 is inclined downward toward the outside in the radial direction of the rotating plate 71. This reduces the contact area between the upper surface of the ring portion 86 and the inner flange portion 68, thereby reducing the rotational resistance of the rotating plate 71. On the other hand, when the rotating plate 71 is inclined relative to the base plate 55 and the fixed member 66, for example, when a load is applied to the seat body 3, the contact area between the upper surface of the sliding member 85 and the inner flange portion 68 increases, so that the fixed member 66 can stably hold the rotating plate 71. [Explanation of symbols]

[0087] 1: Vehicle seat device (vehicle seat) 2: Rotating device 5: Floor 11: Seat cushion 51: Base part 52: Rotating part 55: Base plate 66: Fixing member 68: Inner flange part (flange part) 71: Rotating plate 72:Second bulge 77: Bearings 81: First bearing groove (bearing groove) 85: Sliding parts 86: Ring section 87: Locking part 87A: 1st locking part 87B:Second locking part 89: Locking hole

Claims

1. A vehicle seat, a rotation device provided between a floor and a seat cushion and configured to rotatably support the seat cushion with respect to the floor; the rotation device includes a base portion provided on the floor and a rotation portion provided on the seat cushion and rotatably supported on the base portion, The base portion includes a base plate having a surface facing in a vertical direction and a fixing member extending upward from the base plate, the rotating portion has a disk-shaped rotating plate with a surface facing up and down that is rotatably supported on an upper surface of the base plate via a bearing, a flange portion formed in an annular shape at an upper end of the fixed member, the flange portion having a surface facing up and down and facing the upper surface of the rotary plate via a sliding contact member; the sliding contact member is disposed radially outward of the rotary plate relative to the bearing and has a locking portion that projects into a locking hole formed in the rotary plate, the sliding contact member has a ring portion that extends annularly about the rotation axis of the rotary plate and has an upper surface and a lower surface, The locking portion is provided on the lower surface of the ring portion, The lower surface of the ring portion abuts against the upper surface of the rotating plate, The upper surface of the ring portion is in sliding contact with the lower surface of the flange portion.

2. The bearing includes a plurality of balls and a retainer that supports the balls. The vehicle seat according to claim 1 , wherein the engaging portion overlaps with the bearing when viewed in a radial direction of the rotating plate.

3. the rotating plate has a bearing groove that is recessed upward, extends annularly in a circumferential direction about the rotation axis of the rotating plate, and accommodates the bearing; The vehicle seat according to claim 2 , wherein the sliding contact member is disposed radially outward of the rotating plate relative to the bearing groove.

4. The vehicle seat according to claim 1 , wherein an upper surface of the ring portion is inclined downward toward an outer side in a radial direction of the rotating plate.

5. The vehicle seat according to claim 1 , wherein the ring portion has a thickness in a vertical direction that decreases radially outward of the rotating plate.

6. The locking hole penetrates the rotating plate in the up-down direction, The vehicle seat according to claim 1 , wherein the engaging portion passes through the engaging hole and protrudes below the engaging hole.

7. The vehicle seat according to claim 6 , wherein the plurality of engagement portions include a first engagement portion having a claw portion that passes through the engagement hole and is engaged with a lower edge of the engagement hole.

8. The vehicle seat according to claim 7 , wherein the plurality of engagement portions include a plurality of second engagement portions extending in a circumferential direction centered on the rotation axis of the rotating plate.

9. The rotating plate has a bearing groove that is concave upward and extends annularly around the rotation axis of the rotating plate and accommodates the bearing, the rotating plate has a protrusion on an upper side of the bearing groove, the protrusion extending in the annular shape centered on the rotation axis of the rotating plate, The vehicle seat according to claim 1 , wherein an upper surface of the ring portion is disposed lower than an upper end of the protrusion.

10. A vehicle seat as described in claim 1, wherein the sliding contact member is formed from a resin material having a smaller friction coefficient than metal.

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