Seat rotation device

Abstract

To provide a sheet rotation device which can omit precise calculation of a trajectory, and can rotate a sheet body with a comparatively simple structure.SOLUTION: A sheet rotation device 10 includes a base plate 100, a rotation plate 300, a connection unit 400, and a driving unit 500. The connection unit 400 has a link, a guide part 420 having a linearly extending shape, and a mobile body 430 which is movable along the guide part and supports the rotation plate. The driving unit 500 can move the mobile body 430 along a guide part 420. The link has a fixed end, and a rotation end 412. The guide part 420 has such a shape as to have a radius with a length twice the distance between the fixed end and the rotation end 412, and linearly extend along a diameter of a virtual circle around the fixed end. The mobile body 430 moves along the guide part 420 while relatively rotating the rotation plate with respect to the mobile body 430.SELECTED DRAWING: Figure 5

Description

[Technical field]

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

[0002] Conventionally, there is known a seat rotation device capable of rotating a seat body between a seating position and a boarding / disembarking position. For example, Japanese Patent Application Laid-Open Publication No. 2006-76482 discloses a vehicle seat rotation slide device including a straight rail and a curved rail fixed to a base material, a straight slider movable along the straight rail, a curved slider movable along the curved rail, a tooth row forming member disposed between the straight rail and the curved rail, a support member supporting the seat body, a motor provided on the support member, and a pinion connected to the motor. The tooth row forming member has a first circular arc-shaped tooth row and a second circular arc-shaped tooth row that mesh with the pinion.

[0003] In this device, the pinion moves while meshing with each of the arc-shaped tooth rows of the tooth row forming member by driving the motor, and the straight slider moves along the straight rail and the curved slider moves along the curved rail, so that the support member and the seat body supported by it slide while rotating relative to the base material. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2006-76482 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the rotary slide device described in JP 2006-76482 A, it is necessary to calculate an accurate trajectory of the curved rail, and in order to ensure smooth movement of the curved slider along the curved rail, precise machining of the curved rail and the curved slider is required. Also, in order to ensure smooth meshing of the pinion with each of the arc-shaped tooth rows of the tooth row forming member, it is particularly necessary to accurately calculate and machine the shape of the transition portion between the first arc-shaped tooth row and the second arc-shaped tooth row.

[0006] An object of the present invention is to provide a seat rotation device that can omit precise calculation of a trajectory and can rotate a seat body with a relatively simple structure. [Means for solving the problem]

[0007] A seat rotation device according to one aspect of the present invention is a seat rotation device capable of rotating a seat body between a seating position where the seat body faces the front of a vehicle and a boarding / alighting position where the seat body faces an opening of a door of the vehicle, the seat rotation device comprising: a base plate fixed to a floor side; a rotating plate fixed to an underside of the seat body so as not to rotate relative to the seat body; a connecting unit connecting the base plate and the rotating plate so that the rotating plate can rotate relative to the base plate between the seating position and the boarding / alighting position; and a drive unit driving the connecting unit, the connecting unit including a link connecting the base plate and the rotating plate; a guide portion provided on the base plate and having a shape extending linearly; and a movable body movable along the guide portion, the rotating plate being connected to the base plate so that the rotating plate can rotate relative to the movable body. and the driving unit is capable of moving the moving body along the guide portion, the link has a fixed end fixed to the base plate so as to be rotatable relative to the base plate, and a rotating end fixed to the rotating plate so as to be rotatable relative to the base plate around the fixed end as a center of rotation and to be rotatable relative to the rotating plate, the guide portion has a shape extending linearly along a diameter of a virtual circle having a radius that is twice the length of the distance between the fixed end and the rotating end and having the fixed end as a center, and the moving body moves along the guide portion while rotating a portion of the rotating plate separated from the portion fixed to the rotating end relative to the moving body in the same direction as the direction in which the rotating plate rotates relative to the rotating end when the rotating plate moves from the seating position to the boarding / disembarking position. Effect of the Invention

[0008] According to the present invention, it is possible to provide a seat rotation device that can omit precise calculation of a trajectory and that can rotate a seat body with a relatively simple structure. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a swivel seat in a seating position according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view of the swivel seat in the boarding / disembarking position. [Diagram 3] FIG. 2 is a perspective view of the seat rotation device in a seated position. [Figure 4] FIG. 2 is a perspective view of the seat rotation device in the boarding / alighting position. [Diagram 5] FIG. [Figure 6] 11 is a diagram showing the positional relationship between a base plate, a connecting unit, and a drive unit in a seated position. FIG. [Figure 7] 4 is a perspective view showing a rail receiving portion and a motor receiving portion in the base portion. FIG. [Figure 8] FIG. 2 is an enlarged perspective view of the vicinity of an upper slider. [Figure 9] 4 is a perspective view of the seat rotation device in a seated position as viewed from the rear side of the base plate. FIG. [Figure 10] 13 is a diagram illustrating a schematic positional relationship between a base plate, a rotating plate, and a connecting unit in a seated position. FIG. [Figure 11] 13 is a diagram illustrating a schematic positional relationship between a base plate, a rotating plate, and a connecting unit at a boarding / disembarking position. FIG. [Figure 12] FIG. 11 is a perspective view of a seat rotation device in a seating position according to a second embodiment of the present invention. [Figure 13] FIG. 2 is a perspective view of the seat rotation device in the boarding / alighting position. [Figure 14] FIG. 11 is an exploded perspective view of a seat rotation device according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described with reference to the accompanying drawings, in which the same or corresponding components are designated by the same reference numerals.

[0011] (First embodiment) Fig. 1 is a perspective view of a swivel seat in a seating position according to a first embodiment of the present invention. Fig. 2 is a perspective view of the swivel seat in a boarding / disembarking position. This swivel seat 1 functions as a vehicle seat, particularly as a vehicle seat.

[0012] As shown in FIGS. 1 and 2, a swivel seat 1 of this embodiment includes a seat body 2 and a seat rotation device 10.

[0013] The seat body 2 has a seat cushion 2a and a seat back 2b. The seat cushion 2a constitutes a seat portion. The seat back 2b supports the back of an occupant seated on the seat cushion 2a. The seat body 2 is disposed on a floor FL of the vehicle.

[0014] A seat slider 3 is attached to the floor FL for sliding the seat body 2 in the front-rear direction of the vehicle relative to the floor FL. The seat slider 3 has a lower rail 3a and an upper rail 3b.

[0015] The lower rail 3a is fixed to the floor FL in a position parallel to the front-rear direction of the vehicle. The upper rail 3b is displaceable relative to the lower rail 3a in the front-rear direction of the vehicle (the longitudinal direction of the lower rail 3a).

[0016] The seat rotation device 10 is capable of rotating the seat body 2 between a seating position (position shown in FIG. 1) and an entry / exit position (position shown in FIG. 2). The seating position is a position where the seat body 2 faces the front of the vehicle. The entry / exit position is a position where the seat body 2 faces the opening of the vehicle door. The seat rotation device 10 is fixed to the underside of the seat body 2.

[0017] Fig. 3 is a perspective view of the seat rotation device in a seating position, Fig. 4 is a perspective view of the seat rotation device in a getting-in / out position, and Fig. 5 is an exploded perspective view of the seat rotation device.

[0018] As shown in FIGS. 3 to 5, the seat rotation device 10 includes a base plate 100, a rotation plate 300, a connection unit 400, and a drive unit 500. The base plate 100 includes a rotation plate 300, a connection unit 400, and a drive unit 500.

[0019] The base plate 100 is fixed to a floor FL of a vehicle directly or indirectly via another member. The base plate 100 has a base portion 110, an upright portion 120, and an upper rail connection portion .

[0020] The base portion 110 is formed in a substantially flat plate shape. In this embodiment, the base portion 110 is formed in a rectangular shape that is long in the front-rear direction.

[0021] The standing portions 120 stand upright from both ends of the base portion 110 in the width direction.

[0022] The upper rail connection portion 130 has a shape that protrudes outward in the width direction of the vehicle from the upper end of the standing portion 120. The upper rail connection portion 130 is connected to the upper rail 3b of the seat slider 3. Therefore, the base plate 100 is movable in the front-rear direction of the vehicle together with the upper rail 3b relative to the lower rail 3a.

[0023] A guide protrusion 132 that guides the movement of the rotating plate 300 relative to the base plate 100 is connected to the upper rail connection part 130. The guide protrusion 132 has a shape that rises from the upper rail connection part 130. In this embodiment, the guide protrusion 132 is formed in a cylindrical shape. A flange part 133 that protrudes outward in the radial direction of the guide protrusion 132 is provided on the upper part of the guide protrusion 132.

[0024] In this embodiment, rollers 140 are attached to the base plate 100 to stabilize the relative movement of the rotation plate 300 with respect to the base plate 100 .

[0025] The rotating plate 300 is fixed to the lower surface of the seat body 2 so as not to rotate relative to the seat body 2. As shown in Figs. 3 to 5, the rotating plate 300 is provided with a slit 300S through which the guide protrusion 132 passes. The slit 300S is formed in a shape that does not interfere with the guide protrusion 132 when the rotating plate 300 moves between the seating position and the getting-on / off position, and prevents the flange portion 133 from passing through. Therefore, when an upward force acts on the rotating plate 300 via the seat body 2, such as during a frontal collision of the vehicle, the rotating plate 300 is prevented from moving away from the base plate 100.

[0026] The connecting unit 400 connects the base plate 100 and the rotating plate 300 so that the rotating plate 300 is rotatable relative to the base plate 100 between the seating position and the boarding / disembarking position.

[0027] The connection unit 400 includes a link 410 , a guide portion 420 , and a moving body 430 .

[0028] The link 410 connects the base plate 100 and the rotating plate 300. More specifically, the link 410 connects the base portion 110 and the rotating plate 300. The link 410 has a fixed end 411, a rotating end 412, and an intermediate portion 413.

[0029] The fixed end 411 is fixed to the base plate 100 so as to be rotatable relative to the base plate 100. As shown in Figs. 7 and 9, the fixed end 411 has a fixed portion 411a that is fixed to the base portion 110 by a fastening member B. The fixed end 411 is fixed to a motor receiving portion 114 (see Figs. 6 and 7) of the base portion 110, which will be described later, from the back side of the base portion 110 by the fastening member B. The fixed end 411 is formed at one end of the link 410.

[0030] The rotating end 412 is rotatable with respect to the base plate 100 around the fixed end 411 as the center of rotation, and is fixed to the rotating plate 300 so as to be rotatable relative to the rotating plate 300. As shown in FIG. 5 etc., the rotating end 412 has a support part 412a that rotatably supports the rotating plate 300. The support part 412a is fixed to the rotating plate 300 by a fastening member B. Hereinafter, the part of the rotating plate 300 that is supported by the support part 412a will be referred to as the "supported part 302" (see FIGS. 4 and 5). The rotating end 412 is located on the front side of the base part 110. The rotating end 412 is configured at the other end of the link 410.

[0031] The intermediate portion 413 is a portion located midway between the fixed end portion 411 and the rotating end portion 412. The intermediate portion 413 connects the fixed end portion 411 and the rotating end portion 412. The intermediate portion 413 has a shape that extends from the back side of the base portion 110 to the front side of the base portion 110. The base portion 110 is formed with an insertion hole 110h through which the intermediate portion 413 is inserted. The insertion hole 110h is formed in an arc shape.

[0032] The guide portion 420 is provided on the base plate 100. The guide portion 420 has a shape that extends linearly. The guide portion 420 has a shape that extends linearly along the diameter of a virtual circle A1 (see FIGS. 10 and 11) whose radius is twice the distance between the fixed end portion 411 and the rotating end portion 412 and whose center is the fixed end portion 411. The virtual circle A1 has a radius of twice the distance between the fixed portion 411a of the fixed end portion 411 and the support portion 412a of the rotating end portion 412 and is a circle whose center is the fixed portion 411a. In addition, in FIGS. 10 and 11, the circle A2 and the virtual circle A1 whose radius is the length between the fixed portion 411a and the support portion 412a and whose center is the support portion 412a are indicated by dashed lines.

[0033] As shown in FIGS. 5 to 7, the guide portion 420 has a lower rail 421 and a long groove 422.

[0034] The lower rail 421 is fixed to the base plate 100. Specifically, the lower rail 421 is fixed to the base portion 110. As shown in Fig. 10 and Fig. 11, the lower rail 421 has a shape that extends linearly in a direction intersecting the front-rear direction of the vehicle and along the diameter of an imaginary circle A1. The lower rail 421 is inclined with respect to the front-rear direction so as to gradually approach the door opening toward the front of the vehicle.

[0035] The long groove 422 is formed in the base plate 100. As shown in Figs. 5 to 7, the long groove 422 is formed in the standing portion 120. As shown in Figs. 10 and 11, the long groove 422 has a shape that extends linearly in a direction intersecting the lower rail 421 and along the diameter of the imaginary circle A1. In this embodiment, as shown in Figs. 10 and 11, the long groove 422 is slightly inclined with respect to the longitudinal direction (front-rear direction) of the seat slider 3.

[0036] The moving body 430 is movable along the guide section 420. The moving body 430 supports the rotating plate 300 so that the rotating plate 300 is rotatable relative to the moving body 430. The moving body 430 moves a portion of the rotating plate 300 away from the supported portion 302 (see FIGS. 4 and 5) supported by the rotating end portion 412 along the guide section 420 while rotating the portion relative to the moving body 430 in the same direction (clockwise in FIG. 10) as the rotating plate 300 rotates relative to the rotating end portion 412 when the rotating plate 300 moves from the seating position to the boarding / disembarking position.

[0037] As shown in FIG. 5 and other figures, the moving body 430 has an upper slider 431 and a groove slider 432.

[0038] The upper slider 431 is movable along the lower rail 421. The upper slider 431 supports the rotating plate 300 so that the rotating plate 300 can rotate relative to the upper slider 431. As shown in FIG. 5 and other figures, the upper slider 431 has a first support portion 431a that supports the rotating plate 300. The first support portion 431a supports a portion of the rotating plate 300 that is separated from the supported portion 302 (hereinafter, referred to as the "first supported portion 310"). The first support portion 431a is fixed to the rotating plate 300 by a fastening member B. The upper slider 431 moves the first supported portion 310 forward along the lower rail 421 while rotating the first supported portion 310 relative to the first support portion 431a in the same direction as the direction in which the rotating plate 300 rotates relative to the rotating end portion 412 when the rotating plate 300 moves from the seating position to the boarding / disembarking position.

[0039] As shown in Figures 10 and 11, the movement trajectory of the first support part 431a, i.e., the line segment connecting the position of the first support part 431a at the seating position and the position of the first support part 431a at the boarding / disembarking position, is located forward of the fixed part 411a, which is the center of the virtual circle A1.

[0040] As shown in FIGS. 3 to 5, the first supported portion 310 corresponds to the center portion of the rotation plate 300. As shown in FIG.

[0041] When the seat body 2 moves from the seating position to the getting-on / off position, the upper slider 431 moves along a path of points on the circle A2 (the diameter of the imaginary circle A1) when the circle A2 rotates while being inscribed in the imaginary circle A1. The points on the circle A2 correspond to the first support portion 431a.

[0042] 8, sliding members 461 made of resin or the like and bearings 462 are arranged in a staggered pattern on both sides of the upper slider 431 in a direction perpendicular to both the longitudinal direction and the vertical direction of the lower rail 421. Therefore, rattling of the upper slider 431 in both the lateral direction and the vertical direction of the lower rail 421 is effectively suppressed.

[0043] The groove slider 432 is movable along the long groove 422. The groove slider 432 supports the rotating plate 300 so that the rotating plate 300 can rotate relative to the groove slider 432. As shown in FIG. 5 and other figures, the groove slider 432 has a second support portion 432a that supports the rotating plate 300. The second support portion 432a supports a portion of the rotating plate 300 that is separated from both the supported portion 302 and the first supported portion 310 (hereinafter, referred to as the "second supported portion 320"). The second support portion 432a is fixed to the rotating plate 300 by a fastening member B. The groove slider 432 moves the second supported portion 320 forward along the long groove 422 while rotating the second supported portion 320 relative to the second support portion 432a in the same direction as the direction in which the rotating plate 300 rotates relative to the rotating end portion 412 when the rotating plate 300 moves from the seating position to the boarding / disembarking position. The groove slider 432 is fixed to the upright portion 120 by a plate 463 and a fastener 464 .

[0044] 10 and 11, the fixed part 411a, which is the center of the imaginary circle A1, is located on the movement trajectory of the second support part 432a. In other words, the position of the second support part 432a in the seating position is located rearward of the fixed part 411a, and the position of the second support part 432a in the getting on / off position is located forward of the fixed part 411a.

[0045] As shown in FIGS. 3 to 5, the second supported portion 320 corresponds to the rear end of the rotating plate 300 and the inner end in the width direction.

[0046] When the seat body 2 moves from the seating position to the boarding / disembarking position, the groove slider 432 moves along the locus of points on the circle A2 (the diameter of the imaginary circle A1) when the circle A2 rotates while being inscribed in the imaginary circle A1. The point on the circle A2 corresponds to the second support portion 432a.

[0047] 10 and 11, an extension line of a movement path of the first support portion 431a moving along the lower rail 421 intersects with a movement path of the second support portion 432a moving along the long groove 422 at the fixed portion 411a. Moreover, it is preferable that the support portion 412a, the first support portion 431a, and the second support portion 432a are set at positions that substantially form an equilateral triangle.

[0048] The driving unit 500 drives the connecting unit 400. The driving unit 500 is capable of moving the moving body 430 along the guide portion 420. As shown in FIG. 5, the driving unit 500 has a feed screw 510, a nut member 520, and a motor 530.

[0049] Feed screw 510 is disposed in lower rail 421. Feed screw 510 is rotatable relative to lower rail 421. Specifically, feed screw 510 is held by a holding member 515 (see FIG. 5 ) that holds feed screw 510 so as to be rotatable relative to lower rail 421, and holding member 515 is fixed to base portion 110.

[0050] The nut member 520 is movable in the longitudinal direction of the feed screw 510 while rotating relatively to the feed screw 510. The nut member 520 is fixed to the upper slider 431. Therefore, the upper slider 431 moves together with the nut member 520 in the longitudinal direction of the feed screw 510 (the longitudinal direction of the lower rail 421).

[0051] The motor 530 is capable of rotating the feed screw 510. An output shaft of the motor 530 is connected to the feed screw 510 via a gear (such as a helical gear). As shown in Fig. 3, the motor 530 is disposed between the base plate 100 and the rotating plate 300. As shown in Figs. 4 and 6, the motor 530 is disposed on the side of the lower rail 421 in the longitudinal direction of the lower rail 421.

[0052] 6 and 7, the base portion 110 has a rail receiving portion 112 that receives the lower rail 421 and a motor receiving portion 114 that receives the motor 530, and the motor 530 is disposed in the motor receiving portion 114. The rail receiving portion 112 is formed in a flat plate shape. The motor receiving portion 114 is formed at a lower position than the rail receiving portion 112.

[0053] Next, the operation of the seat rotation device 10 will be described with reference to Figures 10 and 11. Figure 10 is a diagram showing a schematic positional relationship between the base plate, the rotation plate, and the connection unit in the seating position. Figure 11 is a diagram showing a schematic positional relationship between the base plate, the rotation plate, and the connection unit in the boarding / alighting position. The vehicle entrance / exit is provided above Figures 10 and 11. In Figures 10 and 11, the rotation plate 300 is indicated by a two-dot chain line.

[0054] 10, the link 410 is close to or in contact with the rear end of the insertion hole 110h, the upper slider 431 is located at the rear end of the lower rail 421, and the groove slider 432 is located at the rear end of the long groove 422. The first supported portion 310 and the second supported portion 320 of the rotating plate 300 are located on the circle A2.

[0055] In the boarding / disembarking position shown in Figure 11, the link 410 is close to or in contact with the front end of the insertion hole 110h, the upper slider 431 is located at the front end of the lower rail 421, and the groove slider 432 is located at the front end of the long groove 422.

[0056] Hereinafter, a case where the rotating plate 300 is moved from the seating position to the getting-on / off position will be described. In this case, the motor 530 rotates the feed screw 510 in a direction in which the nut member 520 moves forward relative to the lower rail 421.

[0057] 10 and 11, in accordance with the movement of the upper slider 431 forward along the lower rail 421, the support portion 412a of the rotating end portion 412 rotates about the fixed portion 411a of the fixed end portion 411, and the groove slider 432 moves forward along the long groove 422. As a result, the rotating plate 300 rotates toward the entrance while moving forward.

[0058] Specifically, the supported portion 302 of the rotating plate 300 supported by the rotating end portion 412 moves forward along the arc-shaped movement path of the rotating end portion 412 with the fixed end portion 411 as the center of rotation while rotating toward the boarding / alighting door relative to the support portion 412a of the rotating end portion 412. The first supported portion 310 moves forward together with the upper slider 431 along the lower rail 421 while rotating relative to the first support portion 431a in the same direction as the direction in which the rotating plate 300 rotates relative to the rotating end portion 412 (clockwise in Figs. 10 and 11). The second supported portion 320 moves forward together with the groove slider 432 along the long groove 422 while rotating relative to the second support portion 432a in the same direction as the direction in which the rotating plate 300 rotates relative to the rotating end portion 412 (clockwise in Figs. 10 and 11). As a result, the rotating plate 300 moves to the boarding / alighting position.

[0059] In the seat rotation device 10 described above, the guide portion 420 has a shape that extends linearly along the diameter of the imaginary circle A1, so that the moving body 430 moves along the locus (diameter of the imaginary circle A1) of points on the circle A2 when the circle A2 rotates while being inscribed in the imaginary circle A1 when the rotating plate 300 (seat body 2) moves from the seating position to the boarding / alighting position. That is, the link 410 moves along an arc with the fixed end 411 as the center of rotation, and the moving body 430 moves linearly along the diameter of the imaginary circle A1. This makes it possible to omit precise calculation of the locus and to rotate the seat body 2 with a relatively simple structure.

[0060] In addition, since the seat rotation device 10 rotates the seat body 2 toward the entrance while moving the seat body 2 forward, it is possible to avoid a pillar 4 (see FIG. 1) provided on the vehicle.

[0061] In addition, since the movement trajectory of the upper slider 431 is located forward of the fixed part 411a, which is the center of the imaginary circle A1, the movement of the rotating plate 300 from the seating position to the boarding / disembarking position and from the boarding / disembarking position to the seating position are both achieved by the rotation of the link 410 in one direction, which increases the operating efficiency.

[0062] Furthermore, since the feed screw 510 and the nut member 520 are provided on the lower rail 421 side, the moving distance of the moving body (upper slider 431) is shorter than when the feed screw 510 and the nut member 520 are provided on the long groove 422 side.

[0063] Furthermore, since only an axial force acts on the feed screw 510 and the nut member 520 when the rotary plate 300 moves, the feed screw 510 and the nut member 520 can withstand a relatively large load.

[0064] In this embodiment, the rotating plate 300 is supported at three points, the rotating end portion 412, the upper slider 431, and the groove slider 432, so that the seat body 2 is stably supported. Either the upper slider 431 or the groove slider 432 may be omitted. When the upper slider 431 is omitted, the lower rail 421 is also omitted, and when the groove slider 432 is omitted, the long groove 422 is also omitted. When the upper slider 431 and the lower rail 421 are omitted, the drive unit 500 is configured to drive the groove slider 432.

[0065] Second embodiment Next, a rotating seat 1 according to a second embodiment of the present invention will be described with reference to Fig. 12 to Fig. 14. Fig. 12 is a perspective view of the seat rotation device according to the second embodiment of the present invention in the seating position. Fig. 13 is a perspective view of the seat rotation device in the entry / exit position. Fig. 14 is an exploded perspective view of the seat rotation device according to the second embodiment. Note that in the second embodiment, only the parts that differ from the first embodiment will be described, and the same structure, action, and effect as those in the first embodiment will not be described repeatedly.

[0066] In this embodiment, the drive unit 500 further includes a pinion 540 (see FIG. 14) fixed to the output shaft of the motor 530, and the link 410 further includes a gear portion 415 that meshes with the pinion 540.

[0067] The drive unit 500 is fixed on the rotating plate 300. That is, in this embodiment, the drive unit 500 moves together with the rotating plate 300 relative to the base plate 100. The pinion 540 is inserted into a through hole 300h (see FIG. 14) formed in the rotating plate 300.

[0068] The gear portion 415 is provided on the intermediate portion 413 of the link 410. The gear portion 415 rotates the rotating end portion 412 around the fixed end portion 411 relative to the base plate 100 in accordance with the rotation of the pinion 540. The gear portion 415 is formed in an arc shape that is convex in a direction away from the second support portion 432a.

[0069] In this embodiment, as shown in FIG. 14, the fixed portion 411a protrudes upward from the upper surface of the base plate 100, and the fixed end portion 411 is fixed to the upper surface of the base plate 100.

[0070] In this embodiment, when the motor 530 rotates, the pinion 540 rotates. Since the gear portion 415 meshes with the pinion 540, the link 410 rotates around the fixed end portion 411 relative to the base plate 100. In accordance with the rotation of the link 410, the upper slider 431 moves along the lower rail 421, and the groove slider 432 moves along the long groove 422. Therefore, the rotating plate 300 and the seat body 2 move between the seating position and the getting-on / off position.

[0071] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0072] The seat rotation device in the above embodiment is a seat rotation device capable of rotating a seat body between a seating position where the seat body faces the front of the vehicle and a boarding / alighting position where the seat body faces an opening of a door of the vehicle, and includes a base plate fixed to a floor side, a rotating plate fixed to an underside of the seat body so as not to rotate relative to the seat body, a connecting unit connecting the base plate and the rotating plate so that the rotating plate can rotate relative to the base plate between the seating position and the boarding / alighting position, and a drive unit driving the connecting unit, wherein the connecting unit includes a link connecting the base plate and the rotating plate, a guide portion provided on the base plate and having a shape extending linearly, and a movable body movable along the guide portion, the rotating plate being fixed to the bottom surface of the seat body so that the rotating plate can rotate relative to the movable body. and the driving unit is capable of moving the moving body along the guide portion, the link has a fixed end fixed to the base plate so as to be rotatable relative to the base plate, and a rotating end fixed to the rotating plate so as to be rotatable relative to the base plate around the fixed end as a center of rotation and to be rotatable relative to the rotating plate, the guide portion has a shape extending linearly along the diameter of a virtual circle whose radius is twice the length of the distance between the fixed end and the rotating end and whose center is the fixed end, and the moving body moves along the guide portion while rotating a portion of the rotating plate separated from the portion fixed to the rotating end relative to the moving body in the same direction as the direction in which the rotating plate rotates relative to the rotating end when the rotating plate moves from the seating position to the boarding / disembarking position.

[0073] In this seat rotation device, the guide portion has a shape that extends linearly along the diameter of the virtual circle, so that when the rotating plate (seat body) moves from the seating position to the boarding / alighting position, the movable body moves along a trajectory (diameter of the virtual circle) of points on a circle whose radius is the length between the fixed end and the rotating end and whose center is the rotating end as the circle rotates while being inscribed in the virtual circle. In other words, the link moves along an arc whose center is the fixed end, and the movable body moves linearly along the diameter of the virtual circle, so that precise calculation of the trajectory can be omitted, and it is possible to rotate the seat body with a relatively simple structure.

[0074] It is also preferable that the guide portion includes a lower rail fixed to the base plate and having a shape extending linearly in a direction intersecting the fore-and-aft direction of the vehicle and along the diameter of the virtual circle, the movable body includes an upper slider movable along the lower rail, and the upper slider supports the rotating plate so that the rotating plate can rotate relative to the upper slider.

[0075] The drive unit may also include a feed screw that is arranged in the lower rail and can rotate relative to the lower rail, a nut member that can move in the longitudinal direction of the feed screw while rotating relative to the feed screw and is fixed to the upper slider, and a motor that can rotate the feed screw.

[0076] In this embodiment, since the feed screw is disposed inside the lower rail, the space required for disposing the mechanism that moves the upper slider is reduced.

[0077] In addition, it is preferable that the motor is disposed between the base plate and the rotating plate and to the side of the lower rail in the longitudinal direction of the lower rail.

[0078] It is also preferable that the base plate has a rail receiving portion that receives the lower rail and a motor receiving portion that receives the motor, and that the motor receiving portion is formed at a lower position than the rail receiving portion.

[0079] In this way, the thickness of the sheet rotating device can be further reduced.

[0080] The drive unit may also have a pinion and a motor capable of rotating the pinion, and the link may further have a gear portion that meshes with the pinion, and the gear portion may rotate the rotating end relative to the base plate around the fixed end as the pinion rotates.

[0081] It is also preferable that the guide portion further includes a long groove formed on the base plate and having a shape extending linearly in a direction intersecting the lower rail and along a diameter of the imaginary circle, and that the movable body further includes a groove slider movable along the long groove.

[0082] In this embodiment, the rotating plate is supported at three points, namely, the rotating end portion, the upper slider, and the groove slider, so that the attitude of the rotating plate is stable.

[0083] In this case, it is preferable that the long groove is inclined with respect to the front-rear direction of the vehicle.

[0084] In this way, the position of the groove slider in the seating position is further forward than when the long groove is formed parallel to the front-rear direction, so the length of the rotating plate in the front-rear direction is shortened.

[0085] It should be noted that the embodiments disclosed herein are illustrative in all respects and should not be considered as limiting. The scope of the present invention is indicated by the claims, not by the description of the embodiments above, and further includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0086] 1 rotating seat, 2 seat body, 3 seat slider, 10 seat rotation device, 100 base plate, 110 base portion, 110h insertion hole, 112 rail receiving portion, 114 motor receiving portion, 120 standing portion, 130 upper rail connection portion, 300 rotating plate, 302 supported portion, 310 first supported portion, 320 second supported portion, 400 connecting unit, 410 link, 411 fixed end portion, 411a fixed portion, 412 rotating end portion, 412a support portion, 413 intermediate portion, 415 gear portion, 420 guide portion, 421 lower rail, 422 long groove, 430 moving body, 431 upper slider, 431a first support portion, 432 groove slider, 432a second support portion, 500 drive unit, 510 Lead screw, 520 nut material, 530 motor, 540 pinion, A1 virtual circle, A1 circle, FL floor.

Claims

1. A seat rotation device capable of rotating a seat body between a seating position in which the seat body faces a front of a vehicle and an entry / exit position in which the seat body faces an opening of a door of the vehicle, A base plate fixed to the floor side; a rotation plate fixed to a lower surface of the seat body so as not to rotate relative to the seat body; a connection unit that connects the base plate and the rotating plate such that the rotating plate is rotatable relative to the base plate between the seating position and the boarding / disembarking position; A drive unit that drives the connecting unit, The connection unit includes: a link connecting the base plate and the rotating plate; A guide portion provided on the base plate and having a shape extending linearly; a movable body that is movable along the guide portion and supports the rotating plate such that the rotating plate is rotatable relative to the movable body, The drive unit is capable of moving the movable body along the guide portion, The link is: a fixed end portion fixed to the base plate so as to be rotatable relative to the base plate; a rotating end portion that is rotatable with respect to the base plate around the fixed end portion as a rotation center and is fixed to the rotating plate so as to be rotatable relative to the rotating plate; the guide portion has a shape that extends linearly along a diameter of an imaginary circle having a radius that is twice the distance between the fixed end portion and the rotating end portion and has a center at the fixed end portion, the movable body moves a portion of the rotating plate, which is separated from a portion fixed to the rotating end portion, along the guide portion while rotating the portion of the rotating plate relative to the movable body in the same direction as the direction in which the rotating plate rotates with respect to the rotating end portion when the rotating plate moves from the seating position to the boarding / alighting position, The guide portion is a lower rail fixed to the base plate and having a shape extending linearly in a direction intersecting a front-rear direction of the vehicle and along a diameter of the imaginary circle; a long groove formed in the base plate and having a shape extending linearly in a direction intersecting the lower rail and along a diameter of the imaginary circle, The moving body is an upper slider movable along the lower rail; a groove slider movable along the long groove.

2. 2. The seat rotation device according to claim 1, wherein the upper slider supports the rotation plate such that the rotation plate is rotatable relative to the upper slider.

3. The drive unit includes: a feed screw disposed in the lower rail and rotatable relative to the lower rail; a nut member that is movable in a longitudinal direction of the feed screw while rotating relatively to the feed screw and is fixed to the upper slider; 3. The seat rotating device of claim 2, further comprising: a motor capable of rotating the lead screw.

4. The seat rotation device according to claim 3 , wherein the motor is disposed between the base plate and the rotation plate and to a side of the lower rail in the longitudinal direction of the lower rail.

5. The base plate is A rail receiving portion that receives the lower rail; a motor receiving portion that receives the motor, 5. The seat rotating device according to claim 3, wherein the motor receiving portion is formed at a lower position than the rail receiving portion.

6. The drive unit includes: Pinion and a motor capable of rotating the pinion; The link further includes a gear portion that meshes with the pinion, The seat rotation device according to claim 2 , wherein the gear portion rotates the rotating end portion relative to the base plate around the fixed end portion in response to rotation of the pinion.

7. The seat rotating device according to claim 1 , wherein the long groove is inclined with respect to a front-rear direction of the vehicle.

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