Seat for vehicle

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 Art

[0002] Patent Document 1 discloses a vehicle seat that is rotatable about a vertical axis with respect to the floor. The vehicle seat device includes a base member provided on the floor via a slide device, a rotating member provided on the seat cushion and rotatably supported by the base portion, and an electric actuator that rotates the rotating member with respect to the base member. The rotating member is rotatably supported on the upper surface of the base member via balls. A fixed member (cover member) fixed to the base member extends above the rotating member, faces the rotating member via an annular sliding contact member, and suppresses the detachment of the rotating member from the base member.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When the sliding contact member receives a load from the rotating member and the cover member, there is a risk of displacement with respect to the rotating member and the cover member. If the sliding contact member is displaced, the rotational resistance of the rotating member increases, and there is a risk of inhibiting the smooth rotation of the rotating member.

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

Means for Solving the Problems

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

[0007] According to this aspect, the locking portion of the sliding contact member protrudes into the locking hole of the rotating plate, so that the sliding contact member is fixed to the rotating plate. Thereby, in the vehicle seat device, displacement of the sliding contact member can be suppressed.

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

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

[0010] In the above aspect, the rotating plate is recessed upward and extends annularly in the circumferential direction around the rotation axis of the rotating plate, and has a bearing groove (81) for accommodating the bearing. The sliding contact member may be disposed radially outward of the rotating plate with respect to the bearing groove.

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

[0012] In the above aspect, the sliding contact member has a ring portion (86) extending annularly about the rotation axis of the rotating plate, a plurality of locking portions are provided on the 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 may be 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, the upper surface of the ring portion may be inclined downward toward the radially outer side of the rotating plate.

[0015] According to this aspect, the contact area between the upper surface of the sliding contact member and the flange portion becomes smaller, and the rotational resistance of the rotating plate becomes smaller. On the other hand, when the rotating plate is inclined with respect to the base plate and the fixing member, the contact area between the upper surface of the sliding contact member and the flange portion becomes larger, and the fixing member can hold the rotating plate stably.

[0016] In the above aspect, the ring portion may have a smaller thickness in the vertical direction toward the radially outer side of the rotating plate.

[0017] According to this aspect, the contact area between the upper surface of the sliding contact member and the flange portion becomes smaller, and the rotational resistance of the rotating plate becomes smaller. On the other hand, when the rotating plate is inclined with respect to the base plate and the fixing member, the contact area between the upper surface of the sliding contact member and the flange portion becomes larger, and the fixing member can hold the rotating plate stably.

[0018] In the above aspect, the locking hole may penetrate the rotating plate in the vertical direction, and the locking portion may penetrate the locking hole and protrude downward from the locking hole.

[0019] According to this aspect, it becomes difficult for the locking portion to come out of the locking hole, and the sliding contact member is stably fixed to the rotating plate.

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

[0021] According to this aspect, it becomes difficult for the locking portion to come out of the locking hole, and the sliding contact member is stably fixed to the rotating plate.

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

[0023] According to this aspect, it becomes difficult for the locking portion to come out of the locking hole, and the sliding contact member is stably fixed to the rotating plate.

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

[0025] According to this aspect, the vertical thickness of the rotating device can be suppressed.

Advantages of the Invention

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

[0027] According to this aspect, the locking portion of the sliding contact member protrudes into the locking hole of the rotating plate, so that the sliding contact member is fixed to the rotating plate. Thereby, in the vehicle seat device, displacement of the sliding contact member can be suppressed.

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

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

[0030] In the above aspect, the rotating plate is recessed upward and extends annularly in the circumferential direction around the rotation axis of the rotating plate, and has a bearing groove (81) for accommodating the bearing. The sliding contact member may be disposed radially outward of the rotating plate with respect to the bearing groove.

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

[0032] In the above aspect, the sliding contact member has a ring portion (86) extending annularly around the rotation axis of the rotating plate, a plurality of locking portions are provided on the 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 may be 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, the upper surface of the ring portion may be inclined downward toward the radially outer side of the rotating plate.

[0035] According to this aspect, the contact area between the upper surface of the sliding contact member and the flange portion becomes small, and the rotational resistance of the rotating plate becomes small. On the other hand, when the rotating plate is inclined with respect to the base plate and the fixing member, the contact area between the upper surface of the sliding contact member and the flange portion becomes large, and the fixing member can hold the rotating plate stably.

[0036] In the above aspect, the ring portion may have a smaller thickness in the vertical direction toward the radially outer side of the rotating plate.

[0037] According to this aspect, the contact area between the upper surface of the sliding contact member and the flange portion becomes small, and the rotational resistance of the rotating plate becomes small. On the other hand, when the rotating plate is inclined with respect to the base plate and the fixing member, the contact area between the upper surface of the sliding contact member and the flange portion becomes large, and the fixing member can hold the rotating plate stably.

[0038] In the above aspect, the locking hole may penetrate the rotating plate in the vertical direction, and the locking portion may penetrate the locking hole and protrude below the locking hole.

[0039] According to this aspect, it becomes difficult for the locking portion to come out of the locking hole, and the sliding contact member is stably fixed to the rotating plate.

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

[0041] According to this aspect, it becomes difficult for the locking portion to come out of the locking hole, and the sliding contact member is stably fixed to the rotating plate.

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

[0043] According to this aspect, it becomes difficult for the locking portion to come out of the locking hole, and the sliding contact member is stably fixed to the rotating plate.

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

[0045] According to this aspect, the vertical thickness of the rotating device can be suppressed.

Brief Description of the Drawings

[0046]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Best Mode for Carrying Out the Invention

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

[0048] As shown in FIG. 1, the vehicle seat device 1 has a rotating device 2. The vehicle seat device 1 also has a seat body 3 and a slide device 4. The rotating device 2 is provided on the 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 user's buttocks from below. The seat back 12 extends upward from the rear of the seat cushion 11. The seat back 12 supports the user's back 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 in the left-right direction and coupled to the front ends of the left and right seat cushion side members 18, and a rear member 21 extending in the left-right direction and coupled to the rear ends of the left and right seat cushion side members 18. A flexible support member 22 for supporting the user's buttocks is spanned between the front member 19 and the rear member 21. The support member 22 preferably has a plurality of metal wires and a flexible resin plate coupled to each wire. Side covers 23 are provided on the left and right sides of the seat cushion 11. The side covers 23 are supported by the seat cushion side members 18 and conceal the terminals of the pad and the skin material. The side covers 23 are preferably 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 coupled to the upper ends of the left and right seat back side members 29, a lower member 32 extending horizontally and coupled 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 coupled 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 a metal plate. A flexible support member 34 for supporting the user's back is spanned 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 by a plurality of metal wires. The lower ends of the left and right seat back side members 29 are coupled to the rear ends of the corresponding seat cushion side members 18 via a reclining device 35.

[0051] As shown in FIGS. 1 to 3, the slide device 4 has left and right lower rails 37 extending longitudinally and left and right upper rails 38 supported on the respective lower rails 37 so as to be slidable longitudinally. 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 horizontally. The user can slide the upper rail 38 relative to the lower rail 37 by operating the slide operation lever 41.

[0052] As shown in FIGS. 1 to 3, the rotating device 2 is provided between the floor 5 and the seat cushion 11 and supports the seat cushion 11 so as to be rotatable about a first axis A (rotation axis) with respect to the floor 5. The rotating 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 side of the floor 5. In the present 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 vertical direction. The base plate 55 has a circular plate shape. 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 is coupled to the left and right upper rails 38 at both ends. The left and right ends of the front cross member 57 are coupled to the front ends of the corresponding upper rails 38 on the left and right. The left and right ends of the rear cross member 57 are coupled to the rear ends of the corresponding upper rails 38 on the left and right.

[0054] As shown in FIGS. 2 and 3, the front and rear cross members 57 are arranged at a distance from each other in the front and rear directions. The base plate 55 and the front and rear cross members 57 are preferably formed of a metal plate. A plurality of reinforcing structures extending in the left - right direction are preferably formed at the central portions of the respective cross members 57.

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

[0056] As shown in FIGS. 3, 7 to 9, a first bulging portion 61 that bulges downward is formed at the central portion of the base plate 55. The first bulging portion 61 is formed in a bottomed cylindrical shape. A circular first bearing hole 62 that penetrates in the thickness direction is formed at the center of the first bulging portion 61. The first bearing hole 62 is centered on a first axis A that extends vertically. An annular edge wall 63 that protrudes upward or downward is preferably formed at the edge of the first bearing hole 62 (see FIG. 8).

[0057] As shown in FIGS. 2, 7 to 9, the base portion 51 further has a fixing member 66 extending upward from the base plate 55. The fixing member 66 has a cylindrical wall 67 extending upward from the base plate 55 and an inner flange portion 68 extending radially inward from the upper end of the wall 67. The inner flange portion 68 is formed in an annular shape with its surface facing up and down. The outer peripheral surface of the wall 67 is preferably disposed inside the inner peripheral surface of the standing wall 56 of the base plate 55. The fixing member 66 is preferably joined to the base plate 55, for example, by welding the lower part of the outer peripheral surface of the wall 67 of the fixing member 66 and 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 wall 67 and the inner flange portion 68. The reinforcing structure is preferably, for example, a recess or a rib.

[0058] As shown in FIGS. 2 to 9, the rotating portion 52 is provided on the seat cushion 11 and is rotatably supported by the base portion 51. The rotating portion 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 disc shape with its surface facing up and down. The rotating plate 71 is formed of a metal plate. The central portion of the rotating plate 71 has a second bulging portion 72 that bulges upward. The second bulging portion 72 extends in an annular shape around the first axis A. A circular second bearing hole 73 penetrating in the thickness direction is defined at the center of the rotating plate 71 by the inner peripheral edge of the second bulging portion 72. The second bearing hole 73 is centered on the first axis A. An annular edge wall 74 protruding upward or downward is preferably formed at the inner peripheral edge portion of the second bulging portion 72 (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 integrally formed with the second bulging portions 72. Specifically, the third bulging portions 75 are provided so as to project radially outward from the outer peripheral portion of the second bulging portions 72. In the present embodiment, four third bulging portions 75 are arranged at equal intervals in the circumferential direction of the second bulging portions 72. Corresponding bolts 76 extending upward are provided on the upper surface of the third bulging portions 75. The bolts 76 may be stud bolts.

[0060] As shown in FIGS. 8 and 9, the upper surface of the peripheral edge portion of the rotating plate 71 faces the lower surface of the inner flange portion 68. Specifically, the peripheral edge portion of the rotating plate 71 is disposed in a gap formed between the inner flange portion 68 of the fixing 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 the present 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 peripheral portion of the base plate 55 and the lower surface of the outer peripheral portion of the rotating plate 71. Specifically, the retainer 79 is disposed radially outward of the rotating plate 71 than the third bulging portions 75 and radially inward of the rotating plate 71 than the inner peripheral edge of the inner flange portion 68 of the fixing member 66 when viewed from above.

[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 and houses the bearing 77. The first bearing groove 81 is recessed upward from the lower surface of the outer peripheral portion of the rotating plate 71. Further, a second bearing groove 82 that is recessed downward may be formed on the upper surface of the outer peripheral portion of the base plate 55 to receive the lower portion of the bearing 77. A space 84 is formed between the first bulging portion 61 of the base plate 55 and the second bulging portion 72 of the rotating plate 71.

[0063] As shown in FIGS. 5 and 7 to 9, the rotating plate 71 is provided with a sliding contact member 85 that slidably contacts the inner flange portion 68 of the fixing member 66. The sliding contact member 85 is formed of a resin material having a lower coefficient of friction than metal. The sliding contact member 85 is disposed radially outward of the rotating plate 71 with respect to the bearing 77. That is, the sliding contact member 85 is provided radially outward of the rotating plate 71 with respect to the first bearing groove 81. The sliding contact member 85 has a ring portion 86 that extends annularly about 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 in the vertical direction. The upper surface of the ring portion 86 slidably contacts the lower surface of the inner flange portion 68 of the fixing member 66. The ring portion 86 has a smaller thickness in the vertical direction toward the radially outer side of the rotating plate 71. That is, the upper surface of the ring portion 86 may be inclined downward toward the radially outer side of the rotating plate 71. The lower surface of the ring portion 86 is in contact with the rotating plate 71. Since the ring portion 86 is disposed over 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 projects 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 in the front and rear and are respectively provided at the front portion and the rear portion of the ring portion 86. It is preferable that a claw portion 88 extending radially inward of the rotating plate 71 is provided at the lower end of the first locking portion 87A. The second locking portions 87B are preferably arranged at equal intervals in the circumferential direction of the ring portion 86. In the present embodiment, three second locking portions 87B are arranged 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 vertical direction. Each of the locking portions 87A, 87B protrudes into the corresponding locking hole 89 from above and projects below the 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. The second locking portion 87B may be fitted into the corresponding locking hole 89. Thus, 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 in the radial direction of the rotating plate 71. Also, the upper surface of the ring portion 86 is disposed below the upper end of the second bulging portion 72, that is, below the upper surface. An annular receiving groove that is recessed downward may be provided in the rotating plate 71 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. Thereby, the upward displacement of the rotating plate 71 is suppressed.

[0068] As shown in FIG. 7, the rotating portion 52 further has a fixing bracket 91 that couples the rotating plate 71 and the seat cushion frame 14. The fixing bracket 91 is formed in a plate shape with its surface facing up and down. The fixing bracket 91 may be coupled to the left and right seat cushion side members 18. An opening 93 that penetrates vertically is formed at the center of the fixing bracket 91. Corresponding fastening holes 94 through which the bolts 76 provided on the third bulging portion 75 pass are formed around the opening 93. By attaching nuts to the respective bolts 76, the rotating plate 71 and the fixing bracket 91 are fastened to each other.

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

[0070] The rotary actuator 53 rotates the rotary plate 71 with respect to the base plate 55. As shown in FIGS. 3 and 8, the rotary actuator 53 is attached to the lower surface of the base plate 55. The rotary actuator 53 includes an electric motor 111 and a speed reduction mechanism 112. In the present embodiment, the speed reduction mechanism 112 includes a pinion 115 coupled to the 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 larger 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. The output shaft 113 of the rotary actuator 53 extends upward from the speed 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. The pinion 115 coupled to the output shaft 113 is disposed in the space 84 and meshes with the gear 116. The electric motor 111 and the speed 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 with respect to the base plate 55. As shown in FIGS. 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 including, 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 a lock release actuator 151 that rotates the lock claw 121. The lock claw 121 is rotatably supported by the holder 122 about a second axis B.

[0073] As shown in FIGS. 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 into which the lock claw 121 can selectively engage. Each lock hole 132 may be arranged at intervals of 90 degrees from each other about a first axis A. The lock holes 132 may be arranged between the respective third bulges 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 FIGS. 5, 7 to 9, a reinforcing plate 141 is coupled 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 about the first axis A. The reinforcing plate 141 may be formed by dividing an annular member about the first axis A. In the present embodiment, four reinforcing plates 141 are arranged. The central portion of the reinforcing plate 141 may face the corresponding lock hole 132. Both circumferential ends of the reinforcing plate 141 may cover the opening of the third bulge 75. The reinforcing plate 141 may be attached to the rotating plate 71 by fastening means such as bolts and nuts, for example. Alternatively, the reinforcing plate 141 may be welded and coupled 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, through holes 142 facing the respective lock holes 132 are formed in the central portions of the reinforcing plate 141.

[0075] As shown in FIG. 9, the locking claw 121 is displaced between a locked position engaged with the rotating plate 71 and a released position separated from the rotating plate 71. In the locked position, the locking claw 121 passes through the insertion hole 131 and fits into either one of the plurality of locking holes 132 and the corresponding through holes 142. As shown in FIG. 10, between the locking claw 121 and the holder 122, a biasing member 134 that biases the locking claw 121 toward the locked position is provided. The biasing member 134 may be a tension coil spring.

[0076] The unlocking actuator 151 moves the locking claw 121 from the locked position to the released position. As shown in FIGS. 9 and 10, the unlocking actuator 151 includes 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 is engaged with the locking 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 locking claw 121 from the locked position to the released position. When the electric motor 152 stops, the locking claw 121 moves from the released position to the locked position by the biasing force of the biasing member 134.

[0077] In other embodiments, the rotary locking device 54 may change between a locked state and a released state by a manual operation of the user.

[0078] As shown in FIG. 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 unit 161 may have 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 lower surface of the fixed bracket 91. The rotation-side peeling prevention unit may have a known configuration having, for example, a rotation-side hook facing the first base-side hook 163 with a vertical gap therebetween and a locking piece facing the second base-side hook 164 with a vertical gap therebetween.

[0080] When a load is applied to the seat body 3, the first base-side hook 163 of the base-side peeling prevention unit 161 engages with the rotation-side hook of the corresponding rotation-side peeling prevention unit, and peeling of the rotating portion 52 from the base portion 51 is suppressed. Further, when a further load is applied to the seat body 3, the second base-side hook 164 of the base-side peeling prevention unit 161 engages with the locking piece of the corresponding rotation-side peeling prevention unit, and peeling of the rotating portion 52 from the base portion 51 is suppressed.

[0081] Next, a manufacturing method of the vehicle seat device 1 will be described. First, the bulge processing of the support cylinder 101 is performed 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. Thereafter, the support cylinder 101 is inserted into the second bearing hole 73. In this way, the rotating plate 71 is rotatably supported by the support cylinder 101.

[0082] Next, the base plate 55, the bearing 77, and the rotating plate 71 are arranged in an overlapping manner, and the fixing member 66 is arranged on the outer peripheries of the base plate 55 and the rotating plate 71. First, the sliding contact member 85 is attached to the rotating plate 71. Specifically, after each locking portion 87A, 87B of the sliding contact 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. As a result, it becomes difficult for the locking portion 87 to come out of the locking hole 89, and the sliding contact member 85 is stably fixed to the rotating plate 71. Next, the lower portion of the support cylinder 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 coupled to the base plate 55. Specifically, it is preferable that the lower portion of the outer peripheral surface of the fixing member 66 and the upper portion of the inner peripheral surface of the standing wall 56 of the base plate 55 are welded. At this time, the lower surface of the inner flange portion 68 abuts on the upper surface of the sliding contact member 85. In this way, the base plate 55, the bearing 77, the rotating plate 71, the fixing member 66, and the sliding contact member 85 are combined.

[0083] Next, the rotary actuator 53 is attached to the base plate 55, and the pinion 115 and the gear 116 are engaged with each other. Further, a rotary lock device 54 including a release actuator 151 is attached to the base plate 55. In this way, the rotary device 2 is assembled.

[0084] Thereafter, the front and rear cross members 57 are coupled 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 fixed bracket 91. In this way, the vehicle seat device 1 is assembled.

[0085] Thus, since the sliding contact member 85 is fixed to the rotary plate 71, displacement of the sliding contact member 85 can be suppressed. Since the locking portion 87 overlaps with the bearing 77 when viewed from the radial direction of the rotary plate 71, the vertical thickness of the rotary device 2 can be suppressed. Further, 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, the vertical thickness of the rotary device 2 can be further suppressed.

[0086] The upper surface of the ring portion 86 is inclined downward toward the outer side in the radial direction of the rotary plate 71. As a result, the contact area between the upper surface of the ring portion 86 and the inner flange portion 68 becomes small, so that the rotational resistance of the rotary plate 71 becomes small. On the other hand, when the rotary plate 71 is inclined with respect to the base plate 55 and the fixing member 66, for example, when a load is applied to the seat body 3, the contact area between the upper surface of the sliding contact member 85 and the inner flange portion 68 becomes large, so that the fixing member 66 can hold the rotary plate 71 stably.

Description of Reference Numerals

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

Claims

1. It is a vehicle seat, It has a rotating device provided between the floor and the seat cushion, which rotatably supports the seat cushion relative to the floor, The rotating device comprises a base portion provided on the floor, a rotating portion provided on the seat cushion and rotatably supported on the base portion, and a rotation locking device. The base portion comprises a base plate with a surface facing vertically and a fixing member extending upward from the base plate. The rotating part has a disc-shaped rotating plate with its surface facing up and down, which is rotatably supported on the upper surface of the base plate via a bearing. The rotation locking device comprises a holder provided on the base plate and a locking claw rotatably supported by the holder. The pivot point of the locking claw is located in the space formed between the base plate and the rotating plate, which is a vehicle seat.

2. The vehicle seat according to claim 1, wherein the rotating plate has a plurality of locking holes formed thereon in which the locking claws can be selectively engaged, and further, at least one reinforcing plate is attached to it, the reinforcing plate having a through hole formed opposite to at least one of the plurality of locking holes.

3. The plurality of reinforcing plates have surfaces facing up and down, and cooperate to form an annular shape around the rotation axis of the rotating plate, The vehicle seat according to claim 2, wherein the through hole is formed in the central part of each of the reinforcing plates.

4. The locking claw is displaceable between a locked position engaged with the rotating plate and a released position away from the rotating plate, A biasing member is provided between the locking claw and the holder to bias the locking claw toward the locked position. The rotating device further includes a release actuator that rotates the locking claw, The unlock actuator comprises an electric motor and an arm that transmits the driving force of the electric motor to the locking claw. The vehicle seat according to claim 1, wherein when the electric motor is driven, the arm rotates against the biasing force of the biasing member, and the arm moves the locking claw from the locked position to the released position.

Images