Rotation mechanism

Abstract

To provide a seat device for a vehicle in which a rotation drive device having an actuator, an output gear rotated by rotation power exhibited by the actuator and an input gear engaged with the output gear, where a rotation member supporting a seat body is rotatably supported on a base member, is provided between the rotation member and a base member so as to enable rotation drive of the rotation member, which achieves miniaturization in a direction perpendicular to a rotation axis of a rotation member.SOLUTION: At least a part of an input gear 52 is arranged inside of an outer periphery 30d of a rotation member 30 in plan view.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a vehicle seat device provided between a rotating member and a base member, enabling a rotating drive device having an actuator, an output gear rotated by a rotational power exerted by the actuator, and an input gear meshing with the output gear to rotationally drive the rotating member, wherein the rotating member supporting the seat body is rotatably supported by the base member.

Background Art

[0002] Such a vehicle seat device is known, for example, from Patent Document 1.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In what is disclosed in Patent Document 1 described above, an arcuate rotating gear (corresponding to the input gear of the present invention) is fixed to a rotating mechanism main body (corresponding to the base member of the present invention) that supports a rotating ring (corresponding to the rotating member of the present invention), and an actuator including a rotating motor is attached to a bracket extending from the rotating ring and disposed outside the rotating mechanism main body, and an output gear of the actuator is meshed with the rotating gear. For this reason, the vehicle seat device becomes large in the direction orthogonal to the rotation axis of the rotating member.

[0005] The present invention has been made in view of such circumstances, and an object thereof is to provide a vehicle seat device capable of being downsized in the direction orthogonal to the rotation axis of the rotating member.

Means for Solving the Problems

[0006] In order to achieve the above object, in the vehicle seat device provided between the rotating member and the base member, which enables the rotating member that supports the seat body to be rotatably supported by the base member, and a rotation driving device having an actuator, an output gear that rotates by the rotational power exerted by the actuator, and an input gear that meshes with the output gear, to rotationally drive the rotating member, a first feature is that at least a part of the input gear is disposed inside the outer periphery of the rotating member in a plan view.

[0007] Further, in addition to the configuration of the first feature, the present invention is characterized in that at least a part of the gear portion of the input gear is disposed inside the outer periphery of the rotating member in a plan view as a second feature.

[0008] In addition to the configuration of the second feature, the present invention is characterized in that the gear portion is disposed facing the rotation axis side of the rotating member as a third feature.

[0009] In addition to the configuration of the first or second feature, the present invention is characterized in that at least a part of the output gear is disposed inside the outer periphery of the rotating member in a plan view as a fourth feature.

[0010] In addition to any of the configurations of the first to fourth features, the present invention is characterized in that the actuator is disposed inside the outer periphery of the rotating member in a plan view as a fifth feature.

[0011] In addition to any of the configurations of the first to fifth features, the present invention is characterized in that a mounting member disposed inside the outer periphery of the rotating member in a plan view is attached to the rotating member, and the output gear is disposed on the mounting member as a sixth feature.

[0012] In addition to the configuration of the sixth feature, the present invention is characterized in that the actuator is attached to the mounting member as a seventh feature.

[0013] In addition to any of the configurations of the first to seventh features, the present invention is characterized in that an eighth feature is that a circular accommodating portion that is at least open upward is formed in the central portion of the rotating member, and at least a part of the output gear is disposed within the accommodating portion.

[0014] In addition to the configuration of the sixth feature, the present invention is characterized in that a ninth feature is that a circular accommodating portion that is at least open upward is formed in the central portion of the rotating member, and the mounting member having an accommodated portion to be accommodated within the accommodating portion is mounted on the rotating member.

[0015] Furthermore, in addition to the configuration of the ninth feature, the present invention is characterized in that a tenth feature is that the seat body includes a seat cushion supported by a seat cushion frame connected to the rotating member via a connecting member, a seat back disposed above the seat cushion and supported by a seat back frame connected to the seat cushion frame, and a headrest supported by a guide tube provided on the seat back frame so as to enable height adjustment, the connecting member is disposed above the upper end opening of the accommodating portion, and the actuator is mounted on the upper surface of the accommodated portion of the mounting member.

Advantages of the Invention

[0016] According to the first feature of the present invention, since at least a part of the input gear is located inside the outer periphery of the rotating member in plan view, the vehicle seat device can be downsized in a direction orthogonal to the rotation axis of the rotating member as compared with the conventional one in which the input gear is located outside the rotating member.

[0017] Also, according to the second feature of the present invention, since at least a part of the gear portion of the input gear is located inside the outer periphery of the rotating member in plan view, the vehicle seat device can be further downsized in a direction orthogonal to the rotation axis of the rotating member.

[0018] According to the third feature of the present invention, since the gear portion of the input gear faces the rotation axis side of the rotating member, the output gear will be arranged inside the input gear, which can contribute to the miniaturization of the vehicle seat device in the direction orthogonal to the rotation axis of the rotating member.

[0019] According to the fourth feature of the present invention, since at least a part of the output gear is inside the outer periphery of the rotating member in a plan view, the vehicle seat device can be miniaturized in the direction orthogonal to the rotation axis of the rotating member.

[0020] According to the fifth feature of the present invention, since the actuator is arranged inside the outer periphery of the rotating member in a plan view, the vehicle seat device can be miniaturized in the direction orthogonal to the rotation axis of the rotating member.

[0021] According to the sixth feature of the present invention, a mounting member arranged inside the outer periphery of the rotating member in a plan view is attached to the rotating member, and the output gear is disposed on this mounting member. Therefore, it is possible to avoid the enlargement of the vehicle seat device in the direction orthogonal to the rotation axis of the rotating member due to the arrangement of the mounting member for disposing the output gear.

[0022] According to the seventh feature of the present invention, since the actuator is attached to the mounting member, by also giving the mounting member on which the output gear is disposed the support function of the actuator, it is possible to suppress an increase in the number of parts while avoiding the enlargement of the vehicle seat device in the direction orthogonal to the rotation axis of the rotating member.

[0023] According to the eighth feature of the present invention, since at least a part of the output gear is arranged in the circular accommodating portion at the central portion of the rotating member, the output gear can be compactly arranged by effectively using the empty space at the central portion of the rotating member.

[0024] According to the ninth feature of the present invention, the accommodating portion of the mounting member attached to the rotating member is accommodated in the circular accommodating portion at the central portion of the rotating member, so that the workability of attaching the mounting member can be improved and the attachment confirmation can be facilitated.

[0025] Furthermore, according to the tenth feature of the present invention, since the connecting member that connects the seat cushion frame to the rotating member is located above the upper end opening of the accommodating portion and the actuator is attached to the upper surface of the accommodated portion of the attaching member, it is possible to suppress an increase in size in the vertical direction even by attaching the actuator to the attaching member, and contribute to the compactness of the vehicle seat device in the vertical direction.

Brief Description of the Drawings

[0026]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0027] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, "front-rear", "left-right", and "up-down" shall refer to the directions as seen from the seated occupant in a state where the seat is in a forward-facing posture.

[0028] First, in FIG. 1, the vehicle seat device includes a pair of slide rails 13 that extend linearly in parallel with each other at intervals in the left-right direction in order to make the seat body 11 slidable, and a rotation mechanism 14 that movably supports the seat body 11 rotatably along the slide rails 13.

[0029] The seat body 11 includes a seat cushion 11a supported by a seat cushion frame 16, a seat back 11b supported by a seat back frame 17 connected to the seat cushion frame 16 and disposed above the seat cushion 11a, and a headrest 11c supported by a guide cylinder 18 provided on the seat back frame 17 so as to be height-adjustable.

[0030] The seat cushion frame 16 has a pair of side frames 16a arranged so as to linearly extend in the front-rear direction while being spaced apart from each other in the left-right direction, a pan frame 16b as an end-connecting member that connects between the front end portions of the side frames 16a, and a rear pipe 16c as the other end-connecting member that connects between the rear end portions of the pair of side frames 16a.

[0031] In FIG. 2, a cushion-side pressure-receiving member 19 that receives a load from above the seat cushion 11a is attached to the seat cushion frame 16. The cushion-side pressure-receiving member 19 has a plurality (four in this embodiment) of seat springs 20 formed by curving a metal wire in a zigzag manner so as to meander left and right. The seat springs 20 are arranged such that adjacent seat springs 20 are symmetric with respect to the left and right, and a plurality of resin intermediate connecting members 21 integrally formed with the seat springs 20 by insert molding connect adjacent seat springs 20 to each other.

[0032] The front end portions of the plurality of seat springs 20 are respectively engaged with locking portions 22 provided on the pan frame 16b in the seat cushion frame 16. Also, the rear end portions of adjacent seat springs 20 are engaged with the rear pipe 16c of the seat cushion frame 16 and are connected by a resin rear end connecting member 23 integrally formed with the seat spring 20 by insert molding, and the rear end connecting member 23 is formed so as to cover the rear pipe 16c.

[0033] That is, the cushion-side pressure receiving member 19 is spanned between the pan frame 16b and the rear pipe 16c of the seat cushion frame 16, and is disposed between the pair of side frames 16a in plan view.

[0034] Looking again at FIG. 1, the seat back frame 17 includes a pair of seat back side frames 17a extending in the vertical direction so as to be arranged at positions spaced apart from each other in the left-right direction, an upper frame 17b connecting between the upper end portions of the seat back side frames 17a, and a lower frame 17c connecting between the lower end portions of the pair of seat back side frames 17a.

[0035] A back-side pressure receiving member 24 formed of resin or the like so as to be elastically deformable is disposed between the pair of seat back side frames 17a, and this back-side pressure receiving member 24 is spanned between the left and right seat back side frames 17a via an upper connecting wire 25 and a lower connecting wire 26.

[0036] Referring to FIGS. 3 to 5 together, the seat cushion frame 16 is placed on the rotation mechanism 14, and this rotation mechanism 14 includes a base member 29 movable along the slide rail 13, a rotation member 30 that supports the seat frame 15 and is rotatably supported by the base member 29, and a cover member 31 that covers a part of the rotation member 30 from above and is fixed to the base member 29.

[0037] The base member 29 has an annular first bottom wall portion 29a, a cylindrical first side wall portion 29b rising upward from the outer peripheral portion of the first bottom wall portion 29a, and a first flange portion 29c projecting outward from the upper end portion of the first side wall portion 29b, and the first flange portion 29c is formed in a rectangular shape.

[0038] The cover member 31 also includes an annular second bottom wall portion 31a that abuts against the first bottom wall portion 29a of the base member 29 from above, a cylindrical second side wall portion 31b that slightly rises upward from the outer periphery of the second bottom wall portion 31a, a first tapered portion 31c that is formed to have a larger diameter as it goes upward and is continuous with the upper end portion of the second side wall portion 31b, an annular first flat wall portion 31d that projects laterally from the upper end portion of the first tapered portion 31c, and a cylindrical third side wall portion 31e that rises upward from the outer periphery of the first flat wall portion 31d. The second bottom wall portion 31a is coupled to the first bottom wall portion 29a of the base member 29 by a plurality of rivets 32.

[0039] The rotating member 30 is disposed at a position facing the first tapered portion 31c of the cover member 31 from the outer side and is formed to have a larger diameter as it goes upward. It has a second tapered portion 30a, a cylindrical fourth side wall portion 30b that rises upward from the upper end portion of the second tapered portion 30a so as to face the third side wall portion 31e of the cover member 31 from the outer side, and a second flange portion 30c that projects laterally from the fourth side wall portion 30b. The second flange portion 30c is formed in a rectangular shape. A plurality of connecting members 33 extending parallel to the slide rail 13 are fastened to the second flange portion 30c by first bolts 34 and second nuts 35. The side frame 16a of the seat cushion frame 16 is connected to the connecting member 33, and the side frame 16a extends linearly while being arranged side by side at positions spaced apart from each other and is fixedly disposed on the second flange portion 30c of the rotating member 30 via the connecting member 33.

[0040] The rotating member 30 is rotatably supported by a bearing 37 on an annular rotation support portion 36 of the base member 29. The rotation support portion 36 is formed such that the cross-sectional shape of the first bottom wall portion 29a and the first side wall portion 29b of the base member 29 is substantially L-shaped.

[0041] The bearing 37 is formed by holding balls 39 at a plurality of circumferential positions of an annular retainer 38, and an annular recess 40 for rolling the balls 39 is formed in the first tapered portion 31c of the rotating member 30.

[0042] Incidentally, at the central portion of the rotating member 30, a circular accommodating portion 41 formed by the second tapered portion 30a and the fourth side wall portion 30b of the rotating member 30 is formed so as to be open upward and also open downward. The cover member 31 is accommodated and disposed in the accommodating portion 41. Moreover, since the connecting member 33 for connecting the side frame 16a of the seat cushion frame 16 is fixed to the upper surface of the second flange portion 30c of the rotating member 30, the connecting member 33 is disposed above the upper end opening of the accommodating portion 41.

[0043] Incidentally, the slide rail 13 is composed of a fixed rail 45 extending in the longitudinal direction of the vehicle and a movable rail 46 slidably fitted to the fixed rail 45. The first flange portion 29c of the base member 29 is fastened to the movable rail 46 by a plurality of second bolts 47 and second nuts 48.

[0044] The rotating member 30 is rotationally driven by a rotation driving device 49 provided between the rotating member 30 and the base member 29. The rotation driving device 49 includes an actuator 50, an output gear 51 that rotates with the rotational power exerted by the actuator 50, and an input gear 52 that meshes with the output gear 51.

[0045] The actuator 50 and the output gear 51 are disposed on one of the rotating member 30 and the base member 29, on the rotating member 30 side in this embodiment. The input gear 52 is fixed to the other of the rotating member 30 and the base member 29, to the base member 29 in this embodiment.

[0046] The actuator 50 includes an electric motor 53 having a rotation axis extending in the vehicle width direction, a gear box 55 connected to the case 54 of the electric motor 53, and an output shaft 56 protruding from the gear box 55 with the rotation axis parallel to the rotation axis C of the rotating member 30. The output gear 51 is provided on the output shaft 56. A gear reduction mechanism (not shown) is accommodated in the gear box 55 to reduce the rotational power of the electric motor 53 and convert the rotation direction by 90 degrees and transmit it to the output shaft 56. This gear reduction mechanism includes a worm gear so as to prevent the rotational power from the output shaft 56 side from being transmitted to the electric motor 53 side.

[0047] At least a part of the input gear 52 is arranged inside the outer periphery 30d of the rotating member 30, that is, inside the outer edge of the second flange portion 30c in a plan view. Moreover, at least a part of the gear portion 52a of the input gear 52 is arranged inside the outer periphery 30d of the rotating member 30 in a plan view.

[0048] In this embodiment, the rotating member 30 is rotationally driven within a range of 180 degrees. The input gear 52 has a gear portion 52a on its inner peripheral portion and is formed in an arc shape over approximately 180 degrees. The gear portion 52a is fixed to the lower surface of the inner peripheral portion of the first bottom wall portion 29a of the base member 29 so as to protrude radially inward from the inner periphery of the first bottom wall portion 29a. As a result, the gear portion 52a is arranged facing the rotation axis C side of the rotating member 30.

[0049] When fixing the input gear 52 to the base member 29, a part of a plurality of rivets 32 that couple the second bottom wall portion 31a of the cover member 31 to the first bottom wall portion 29a of the base member 29 is used to couple the second bottom wall portion 31a and the input gear 52 to the first bottom wall portion 29a together with the first bottom wall portion 29a interposed therebetween. At this time, when the circumferential end portion of the input gear 52 is disposed at a portion corresponding to the rivet 32 for coupling the second bottom wall portion 31a and the input gear 52 to the first bottom wall portion 29a together, in order to avoid making the circumferential length of the input gear 52 unnecessarily long, as shown in FIG. 4, a notch 57 may be formed in the circumferential end portion of the input gear 52.

[0050] At least a part of the output gear 51 is disposed inside the outer periphery 30d of the rotating member 30 in a plan view. In this embodiment, the input gear 52 with the gear portion 52a facing the rotation axis C side of the rotating member 30 is fixed to the first bottom wall portion 29a of the base member 29, and the output gear 51 meshes with the gear portion 52a of the input gear 52. Therefore, all of the output gear 51 is disposed inside the outer periphery 30d of the rotating member 30 in a plan view.

[0051] Also, the actuator 50 having the output shaft 56 on which the output gear 51 is provided is also disposed inside the outer periphery 30d of the rotating member 30 in a plan view.

[0052] Incidentally, a mounting member 58 disposed inside the outer periphery 30d of the rotating member 30 in a plan view is attached to the rotating member 30. The output gear 51 is disposed on the mounting member 58, and the actuator 50 is attached to the mounting member 58. That is, in this embodiment, the gear box 55 of the actuator 50 is attached to the upper surface of the mounting member 58, and the output gear 51 is provided on the output shaft 56 passing through the mounting member 58, so that the output gear 51 is disposed on the mounting member 58.

[0053] Also, the lower surface of the inner peripheral portion of the first bottom wall portion 29a in the base member 29 is substantially at the same height as the lower end portion of the rotating member 30, that is, the lower small-diameter end portion of the second tapered portion 30a. The input gear 52 fixed to the lower surface of the inner peripheral portion of the first bottom wall portion 29a is located below the lower end of the accommodating portion 41 that the rotating member 30 has at its central portion. Therefore, the meshing portion of the output gear 51 meshing with the input gear 52 is located below the lower end portion of the accommodating portion 41, but the portion above the meshing portion is accommodated in the accommodating portion 41, and at least a part of the output gear 51 is disposed in the accommodating portion 41.

[0054] In this embodiment, the mounting member 58 is disposed in front of the rotation axis C of the rotating member 30. The mounting member 58 has, at both ends, a plate portion 58a to be coupled to the upper surface of the second flange portion 30c of the rotating member 30 and extends so as to be orthogonal to the longitudinal direction of the slide rail 13. Between the pair of plate portions 58a to be coupled, a received portion 58b is formed to be recessed so as to enter the accommodating portion 41 having an upper end opening below the connecting member 33. The actuator 50 is attached to the upper surface of the received portion 58b. The actuator 50 is disposed below the cushion-side pressure receiving member 19 while avoiding interference with the cushion-side pressure receiving member 19, and the actuator 50 is attached to the upper surface of the received portion 58b in the mounting member 59 below the cushion-side pressure receiving member 19.

[0055] Incidentally, an annular slider 60 that is in sliding contact with the first tapered portion 31c of the cover member 31 and the second tapered portion 30a of the rotating member 30 is interposed between them. This slider 60 is used to rotate the rotating member 30 by applying an input force to the rotation mechanism 14 instead of the electric power from the actuator 50, and is also used to share the cover member 31 and the rotating member 30. In a vehicle seat device that enables rotation by manual force, an annular member that forms part of a mechanism for suppressing rattling of the rotating member 30 in a locked state that prevents rotation of the rotating member 30 is interposed between the first tapered portion 31c and the second tapered portion 30a in place of the slider 60.

[0056] Next, the operation of this embodiment will be described. A rotation drive device 49 provided between the rotating member 30 and the base member 29, which enables rotationally driving the rotating member 30, includes an actuator 50, an output gear 51 that rotates with the rotational power exerted by the actuator 50, and an input gear 52 that meshes with the output gear 51. Since at least a part of the input gear 52 is disposed inside the outer periphery 30d of the rotating member 30 in a plan view, the vehicle seat device can be made smaller in a direction orthogonal to the rotation axis C of the rotating member 30 compared to a conventional one where the input gear is located outside the rotating member.

[0057] Also, since at least a part of the gear portion 52a of the input gear 52 is disposed inside the outer periphery 30d of the rotating member 30 in a plan view, the vehicle seat device can be made even smaller in a direction orthogonal to the rotation axis C of the rotating member 30.

[0058] Moreover, since the gear portion 52a is disposed facing the rotation axis C side of the rotating member 30, the output gear 51 will be disposed inside the input gear 52, which can contribute to making the vehicle seat device smaller in a direction orthogonal to the rotation axis C of the rotating member 30.

[0059] Further, since at least a part of the output gear 51 is disposed inside the outer periphery 30d of the rotating member 30 in a plan view, the vehicle seat device can be downsized in the direction orthogonal to the rotation axis C of the rotating member 30.

[0060] Further, since the actuator 50 is disposed inside the outer periphery 30d of the rotating member 30 in a plan view, the vehicle seat device can be downsized in the direction orthogonal to the rotation axis C of the rotating member 30.

[0061] Further, a mounting member 58 disposed inside the outer periphery 30d of the rotating member 30 in a plan view is attached to the rotating member 30, and the output gear 51 is disposed on the mounting member 58. Therefore, it is also possible to avoid an increase in the size of the vehicle seat device in the direction orthogonal to the rotation axis C of the rotating member 30 due to the arrangement of the mounting member 58 for disposing the output gear 51.

[0062] Further, since the actuator is attached to the mounting member 58, by also providing the mounting member 58 on which the output gear 51 is disposed with the support function of the actuator 50, it is possible to suppress an increase in the number of parts while avoiding an increase in the size of the vehicle seat device in the direction orthogonal to the rotation axis C of the rotating member 30.

[0063] Further, a circular accommodating portion 41 that is at least open upward is formed in the central portion of the rotating member 30, and at least a part of the output gear 51 is disposed in the accommodating portion 41. Therefore, the output gear 51 can be compactly arranged by effectively using the empty space in the central portion of the rotating member 30.

[0064] Further, since the mounting member 58 having the accommodated portion 58b to be accommodated in the accommodating portion 41 in the central portion of the rotating member is attached to the rotating member 30, it is possible to improve the workability of attaching the mounting member 58 and facilitate the attachment confirmation.

[0065] Furthermore, since the connecting member 33 that connects the seat cushion frame 16 supporting the seat cushion 11a of the seat body 11 to the rotating member 30 is located above the upper end opening of the accommodating portion 41, and the actuator 50 is attached to the upper surface of the accommodated portion 58b of the attachment member 58, it is possible to suppress an increase in size in the vertical direction even by attaching the actuator 50 to the attachment member 58, contributing to the downsizing of the vehicle seat device in the vertical direction.

[0066] As described above, the embodiments of the present invention have been explained. However, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the claims.

Explanation of Reference Numerals

[0067] 11 ··· Seat body 11a ··· Seat cushion 11b ··· Seat back 11c ··· Headrest 16 ··· Seat cushion frame 17 ··· Seat back frame 18 ··· Guide cylinder 29 ··· Base member 30 ··· Rotating member 30d ··· Outer periphery of the rotating member 33 ··· Connecting member 41 ··· Accommodating portion 49 ··· Rotation drive device 50 ··· Actuator 51 ··· Output gear 52 ··· Input gear 52a ··· Gear portion 58 ··· Attachment member 58b ··· Accommodated portion C ··· Axis of rotation

Claims

1. A rotation mechanism that rotatably supports a seat body, A base member; a rotation member rotatably supported on the base member to support the seat main body; a mounting member attached to the rotating member; an actuator attached to the mounting member; an output gear disposed on the mounting member and rotated by rotational power generated by the actuator; an input gear provided on the base member and meshing with the output gear, The base member is supported by a pair of slide rails that extend linearly and are parallel to each other with a gap in between in the left-right direction, the input gear and the mounting member are disposed in a position that is inward from an outer periphery of the rotating member and avoids a rotation axis of the rotating member in a plan view, In a plan view, the mounting member is a rotation mechanism that is arranged inside the outer edges of the pair of slide rails in the left-right direction.

2. The rotation mechanism according to claim 1 , wherein a portion of the mounting member is disposed below an upper end of each of the slide rails.

3. A storage section that is open upward and downward is formed in the center of the rotating member, The mounting member is formed with a recessed accommodated portion so as to fit into the accommodation portion, The rotation mechanism according to claim 2 , wherein the actuator is attached to an upper surface of the accommodated portion.

4. The rotation mechanism according to claim 1 , wherein, in a plan view, the attachment member extends in a normal direction of an imaginary circle centered on the rotation axis.

5. The rotation mechanism according to claim 1 , wherein, when the seat body is facing forward, the attachment member is disposed between a front end of the rotation member and the rotation axis.

6. The rotating member is rotatably supported on the base member via a bearing, The output gear extends vertically, The rotation mechanism according to claim 2 , wherein a portion of the bearing is disposed below an upper end of the output gear and above a lower end of the output gear.

7. the input gear is disposed below an upper end of the output gear and above a lower end of the output gear, The rotation mechanism according to claim 6 , wherein a portion of the bearing is disposed below an upper end of the input gear and above a lower end of the input gear.

8. The bearing includes an annular retainer and a plurality of balls held by the retainer, The retainer is disposed about the axis of rotation, The rotation mechanism according to claim 6 , wherein, in a plan view, the output gear is disposed inside the retainer, and the pair of slide rails are disposed outside the retainer.

9. The output gear is provided on an output shaft of the actuator, 2. The rotation mechanism according to claim 1, wherein the output shaft extends vertically and passes through the mounting member.

10. The rotation mechanism according to claim 9 , wherein the output gear is disposed at a position overlapping the mounting member in a plan view.

Images