JP2011033058A - Rotary damper for vehicle seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary damper for vehicle seat, which allows comfortable rotation of a backrest part. <P>SOLUTION: The rotary damper for vehicle seat 1 includes: a storage body 7 storing a viscous fluid 3; a rotor 8 disposed in an inner part 2 of the storage body 7 and fixed to a backrest part 6; an elastic means 15 connected to a seat part 5 through one end portion 13 and connected to the backrest part 6 through the other end portion 14; an elastic means 18 connected to the seat part 5 through one end portion 16 and connected to the backrest part 6 through the other end portion 17; and a vane means 20 which causes, in the viscous fluid 3, a large fluid resistance in R1-directional relative rotation of the rotor 8 to the storage body 3, and a fluid resistance smaller than the fluid resistance in R-directional relative rotation of the rotor 8 to the storage body 3. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  In the present invention, a rotating body having a vane is rotatably accommodated in a container for accommodating a viscous fluid, and braking is applied to the rotation of the rotating body by the viscous fluid, whereby the seat can be rotated freely. The present invention relates to a rotary damper for a vehicle seat that provides moderate rotational braking to a backrest that is connected and foldable.

  A one-way rotary damper of this type that gives a large brake to one rotation of the rotating body and a small brake to the other rotation of the rotating body by the viscous fluid passing through the gap. It is known from Patent Document 1 and the like.

JP 2005-188636 A JP-A-9-42350 JP 9-329173 A JP-A-8-109940 JP-A-8-296687

  By the way, in vehicle seats for automobiles and the like, when the backrest portion is rotated from the initial rotation position to the folding rotation position and vice versa, the rotational force (rotational moment) due to the weight of the backrest portion according to the rotation position of the backrest portion In particular, when the backrest is folded from the folding rotation position toward the initial rotation position, a large manual force is required.

  The present invention has been made in view of the above-described points, and an object thereof is to provide a rotary damper for a vehicle seat capable of comfortably rotating a backrest portion.

  A rotary damper for a vehicle seat according to the present invention accommodates a viscous fluid therein and is rotatably connected to the seat portion of the vehicle seat and the seat portion so as to be rotatable between an initial rotation position and a folding rotation position. The vehicle body seat is fixed to one of the backrests and is rotatably arranged inside the housing body so as to form a space for housing the viscous fluid between the housing body and the vehicle seat. A rotating body fixed to the other of the seat portion and the backrest portion; one end portion connected to one of the seat portion and the backrest portion of the vehicle seat; and the other end portion of the seat portion of the vehicle seat; The first predetermined rotation between the initial rotation position and the folding rotation position from the initial rotation position with respect to the seat portion of the backrest portion, which is connected to the other of the backrest portions and is centered on the rotation axis of the rotating body with respect to the housing To position A first elastic means for applying an elastic rotational force in a direction toward the rotational position of folding to the leaning portion, and one end connected to one of the seat portion and the backrest portion of the vehicle seat, while the other end portion A second portion between the initial rotation position and the folding rotation position of the seat portion of the backrest portion connected to the other one of the seat portion and the backrest portion of the vehicle seat and centering on the rotation axis of the rotating body with respect to the container. Second elastic means for applying an elastic rotational force in the direction toward the initial rotational position to the backrest portion from the predetermined rotational position to the folding rotational position, and the container in the direction from the initial rotational position of the backrest portion to the folding rotational position. In the relative rotation of the rotating body, a large flow resistance is smaller than the flow resistance in the relative rotation of the rotating body with respect to the container in the direction from the folding rotation position of the backrest portion to the initial rotation position. To cause Do flow resistance in each viscous fluid, which comprises a and housing and the vane means disposed in the space accommodating the viscous fluid between the rotating member.

  According to the rotary damper for a vehicle seat according to the present invention, the first elastic means includes the initial rotation position and the folding rotation position from the initial rotation position with respect to the seat portion of the backrest portion around the rotation axis of the rotation body with respect to the housing body. The elastic force is applied to the backrest part in the direction toward the rotational position by folding it to the first predetermined rotational position between the second rotational means and the second elastic means is centered on the rotational axis of the rotational body relative to the container From the second predetermined rotation position between the initial rotation position and the folding rotation position with respect to the seat portion of the backrest portion and the folding rotation position, an elastic rotational force in the direction toward the initial rotation position is applied to the backrest portion. In the relative rotation of the rotating body with respect to the container in the direction in which the vane means moves from the initial rotation position of the backrest portion to the folding rotation position, a large flow resistance is applied to the viscous fluid, and the backrest portion In the relative rotation of the rotating body with respect to the container in the direction from the folding rotation position to the initial rotation position, a flow resistance smaller than the flow resistance is generated, so the backrest portion is moved from the initial rotation position to the first rotation position. When rotating to one predetermined rotation position, the backrest portion can be easily rotated with the aid of the first and second elastic means, and the backrest portion is rotated from the second predetermined rotation position to the folding rotation position. In this case, the second elastic means can prevent sudden rotation of the backrest due to the rotational force gradually increasing toward the folding rotation position based on the weight of the backrest, and the backrest can be folded and rotated from the initial rotation position. When rotating to the position, the vane means can generate a large flow resistance in the viscous fluid, resulting in the folding rotation position of the backrest While it is possible to give a moderate resistance to the rotation in the direction of the head and avoid the collision of the backrest at the folding rotation position, when manually rotating the backrest from the folding rotation position to the initial rotation position, In addition to the assistance by the second elastic means, the flow resistance of the viscous fluid generated by the vane means can be reduced. As a result, the backrest portion can be easily manually rotated from the folding rotation position to the initial rotation position.

  In a preferred example, the first elastic means is an elastic rotational force in a direction toward the folding rotation position in the rotation toward the folding rotation position from the initial rotation position to the first predetermined rotation position with respect to the seat portion of the backrest portion. Is applied to the backrest portion to rotate the backrest portion relative to the seat portion against the flow resistance of the viscous fluid, while the backrest portion between the first predetermined rotation position and the folding rotation position is At the rotational position relative to the seat portion, the application of the elastic rotational force in the direction toward the folding rotational position to the backrest portion is released.

  The container extends over a range corresponding to a range from a first predetermined rotation position with respect to the seat portion of the backrest portion with respect to the rotation axis of the rotating body relative to the housing body to a folding rotation position with respect to the seat portion of the backrest portion. The rotating body has a rotating shaft fixed to the other of the seat portion and the backrest portion of the vehicle seat, and the first elastic means is a slit of the housing body. Or it is good to have one end part which is distribute | arranged to a recess and engages with a container, and the other end part which is fitted and engaged with the rotating shaft of a rotary body.

  In another preferred example, the first elastic means is a coil connected at one end to one of the container and the rotating body and connected to the other of the container and the rotating body at the other end. The second elastic means is connected to one of the container and the rotating body at one end and is connected to the other of the container and the rotating body at the other end. A spiral spring is provided.

  The second elastic means changes from the second predetermined rotation position due to the weight of the backrest portion to the folding rotation position from the second predetermined rotation position with respect to the seat portion of the backrest portion to the folding rotation position. An elastic rotational force against a rotational force in a direction toward the folding rotational position may be applied to the rotation of the backrest portion with respect to the seat portion.

  In the rotary damper for a vehicle seat according to the present invention, the vane means preferably has two spaces for accommodating the viscous fluid between the cylindrical inner peripheral surface of the container and the cylindrical outer peripheral surface of the rotor. A pair of elastic flexible vanes that are partitioned and integrally formed on the outer peripheral surface of the rotating body, and at least one of the two chambers partitioned by the pair of elastic flexible vanes is further divided into two chambers. And another elastic flexible vane integrally formed on the inner peripheral surface of the container.

  In the present vane means, each of the pair of elastic flexible vanes is connected to the outer peripheral surface of the rotating body at one end and protrudes in a direction opposite to the relative rotation in one direction of the rotating body with respect to the container. A curved convex surface and a curved concave surface connected to the outer peripheral surface of the rotating body at one end corresponding to the convex surface and extending along the convex surface. Thus, a pair of wedge spaces facing each other in the rotation direction of the relative rotation of the rotating body with respect to the container are arcuate convex surfaces formed between the inner peripheral surface of the container and the arcuate convex surface is The width of one wedge space communicating with one of the two adjacent chambers with the arcuate convex surface in the rotation direction of the relative rotation of the rotating body relative to the rotating body is relative to the containing body. The arcuate convex surface in the direction of rotation The width in the radial direction of the one wedge space is determined so as to gradually become narrower toward the other wedge space communicating with the other chamber of the two adjacent chambers. In the rotational direction of the relative rotation of the rotating body, the radial width of the other wedge space communicating with the other of the two adjacent chambers with the arcuate convex surface in between is the relative rotation of the rotating body with respect to the container In the radial direction of the other wedge space so that it gradually becomes narrower toward one wedge space communicating with one of the two adjacent chambers with the arcuate convex surface in between. The viscous fluid that has passed through the pair of wedge spaces elastically deflects each of the pair of elastic flexible vanes and determines the radial width of the pair of wedge spaces based on the viscosity. Each of the pair of elastic flexible vanes is The rotation of the backrest from the initial rotation position to the folding rotation position via the first and second predetermined rotation positions flows through the pair of wedge spaces narrowed from the other chamber to one chamber in the rotation relative to the seat portion. An initial rotation through the first and second predetermined rotation positions from the folding rotation position while the viscous fluid is caused to generate a flow resistance that is defined by the pair of wedge spaces formed and resists the rotation. The rotation of the backrest to the position relative to the seat is defined by the pair of widened wedge spaces flowing from one chamber to the other chamber through the pair of wedge spaces and resisting the rotation. The flow resistance to be generated may be generated in the viscous fluid.

  In the vane means having such a pair of elastic flexible vanes, the backrest portion is rotated in the direction from the initial rotation position to the folding rotation position by the elastic rotational force of the first elastic means, and one chamber is When the rotating body is rotated relative to the container so as to enlarge the other chamber and reduce the other chamber, the pressure of the viscous fluid is applied to the concave surface of the elastic flexible vane. As a result of the elastic flexible vane being elastically deformed so that the other end side of the vane approaches the inner peripheral surface of the container and the pair of wedge spaces are reduced, the viscous fluid passes through the pair of reduced wedge spaces and the other. A large brake is applied to the rotation of the rotating body due to the flow resistance of the viscous fluid flowing from one chamber to the other chamber and passing through the reduced pair of wedge spaces. The folding rotation position is reached via the second predetermined rotation position. While being rotated, the backrest is rotated in the direction from the folding rotation position toward the initial rotation position by the elastic rotational force of the manual and second elastic means so as to reduce one chamber and expand the other chamber. When the rotating body is rotated relative to the container, the pressure of the viscous fluid is applied to the curved convex surface of the elastic flexible vane. As a result of elastic deformation of the elastic flexible vane so as to widen the pair of wedge spaces away from the inner peripheral surface, the viscous fluid flows from one chamber to the other through the pair of widened wedge spaces. The backrest portion is moved through the second predetermined rotational position by a small manual force because a small braking force due to a relatively small flow resistance of the viscous fluid passing through the pair of widened wedge spaces is given to the rotation of the rotating body. Turn to the first predetermined rotation position. Is, from the first predetermined rotational position to the initial rotational position will receive the manual rotation force elastic damping gradually increasing according to the first and second elastic means.

  According to the rotary damper of the present invention that functions as a one-way damper by the vane means, the viscous fluid whose viscosity decreases as the temperature rises passes through the pair of wedge spaces in the rotation of the rotating body. When the viscous fluid having increased viscosity below normal temperature (20 ° C.) passes through the pair of wedge spaces, the other end side of the elastic flexible vane is caused by the increase in pressure of the viscous fluid in the pair of wedge spaces. As a result of the elastic flexible vane being elastically deformed away from the inner peripheral surface of the container to expand the pair of wedge spaces, the viscosity of the viscous fluid itself increases and the flow resistance decreases due to the expansion of the pair of wedge spaces. While the brake at normal temperature can be maintained despite the low temperature, if the viscous fluid whose viscosity is lower than that at normal temperature passes through the pair of wedge spaces at high temperature, the pressure of the viscous fluid decreases in the pair of wedge spaces Due to elasticity The elastic flexible vane is elastically deformed so that the other end side of the flexible vane approaches the inner peripheral surface of the container and the pair of wedge spaces are narrowed. As a result, the viscosity of the viscous fluid itself is reduced and the pair of wedge spaces is reduced. By increasing the flow resistance due to the above, it becomes possible to maintain braking at normal temperature despite high temperature, and therefore, the generated braking has no temperature dependence, and it is possible to obtain braking that does not change at both high and low temperatures. it can.

  In a preferred example, the concave surface extends along the convex surface so as to gradually approach the convex surface from one end to the other end of the convex surface, and the arc-shaped convex surface is the radius of curvature of the cylindrical inner peripheral surface of the container. Has a smaller radius of curvature.

  In the present invention, the other elastic flexible vanes include an elastically flexible base formed integrally with the inner peripheral surface of the container, and an outer periphery of the rotating body formed integrally with the base. And an elastically flexible tongue having an arcuate surface facing the surface.

  As the viscous fluid according to the present invention, silicone oil can be cited as a preferred example, but other viscous fluids may be used, and the container may be made of metal, but it is light in weight and cost. It may be made of a hard synthetic resin for reasons such as reduction of the rotation, and the rotating body may also be made of metal, but may be made of a hard synthetic resin for reasons such as weight reduction and cost reduction. Well, each elastic flexible vane may be fixed to the rotating body or the container separately from the rotating body or the container by welding, fitting, adhesion, etc. When the rotating body or the housing body and the elastic flexible vane are integrally formed, the rotating body or the housing body is a synthetic resin material that imparts appropriate elasticity to the elastic flexible vane. Is preferably used.

  ADVANTAGE OF THE INVENTION According to this invention, the rotary damper for vehicle seats which can perform rotation of a backrest part comfortably can be provided.

It is II sectional view explanatory drawing of FIG. 2 of a preferable example of this invention. It is II-II sectional view explanatory drawing of the example shown in FIG. 4 of FIG. FIG. 5 is a cross-sectional explanatory view taken along the line III-III in FIG. 4 of the example shown in FIG. 1. It is a front view of the example shown in FIG. It is a rear view of the example shown in FIG. It is a perspective view of the example shown in FIG. It is a partially expanded explanatory view of the example shown in FIG. It is explanatory drawing which attached the rotating shaft to the example shown in FIG. It is a perspective view of the rotating shaft shown in FIG. It is explanatory drawing of the example with which the example shown in FIG. 1 was mounted | worn with the vehicle seat. It is operation | movement explanatory drawing of the example shown in FIG. It is operation | movement explanatory drawing of the example shown in FIG.

  Next, embodiments of the present invention will be described in more detail based on preferred examples shown in the drawings. The present invention is not limited to these examples.

  1 to 10, a rotary damper 1 for a vehicle seat according to this embodiment accommodates a viscous fluid 3 made of silicone oil or the like and having a viscosity that decreases as the temperature rises, and a seat for the vehicle seat 4. One of the backrest parts 6 connected to the part 5 and the seat part 5 so as to be rotatable in the R1 and R2 directions around the rotation axis O so as to be rotatable between the initial rotation position P0 and the folding rotation position P3, In this example, the synthetic resin housing 7 fixed to the seat 5 and the seat 7 of the vehicle seat 4 are disposed in the interior 2 of the housing 7 so as to be rotatable in the directions R1 and R2. 5 and the backrest 6, in the present example, the synthetic resin rotating body 8 that is fixed to the backrest 6, and the seat 5 and the backrest 6 of the vehicle seat 4 at one end 13. One of them is connected to the seat 5 in this example On the other hand, the other end portion 14 is connected to the other one of the seat portion 5 and the backrest portion 6 of the vehicle seat 4, in this example, the backrest portion 6 and is centered on the rotational axis O of the rotating body 8 with respect to the container 3. An elastic means 15 for applying an elastic rotational force in the R1 direction which is a direction toward the folding rotational position P3 to the backrest portion 6 from the initial rotational position P0 to the predetermined rotational position P2 with respect to the seat portion 5 of the backrest portion 6; 16 is connected to the seat 5 which is one of the seat 5 and the backrest 6 of the vehicle seat 4, while the other of the seat 5 and the backrest 6 of the vehicle seat 4 is connected to the other end 17. And a predetermined rotation position between the initial rotation position P0 and the folding rotation position P3 with respect to the seat portion 5 of the backrest portion 6 around the rotation axis O of the rotation body 8 with respect to the housing body 7. Folded from P1 Elastic means 18 for applying elastic rotational force in the R2 direction, which is the direction toward the initial rotational position P0, to the backrest portion 6 up to the position P3, and R1 that is the direction from the initial rotational position P0 of the backrest portion 6 toward the folding rotational position P3 In the relative rotation of the rotating body 8 with respect to the container 3 in the direction, a large flow resistance is caused by relative rotation of the rotating body 8 with respect to the container 3 in the R2 direction, which is the direction from the folding rotation position P3 of the backrest 6 toward the initial rotation position P0. In the case of the rotational rotation, vane means 20 arranged in an annular space 19 between the container 3 and the rotating body 8 are provided so as to cause the viscous fluid 3 to generate a flow resistance smaller than the flow resistance. Yes.

  A container 7 having a cylindrical inner peripheral surface 27 including semi-cylindrical inner peripheral surfaces 25 and 26 has a cylindrical body 28 and one annular shape in the A direction that is the axial direction of the cylindrical body 28. A flange portion 32 having an inner peripheral surface 31 that is integrally formed radially inward with the end portion 29 and that defines the through-hole 30, and the other annular end portion in the A direction of the cylindrical body 28 And a lid 35 fixed to a plurality of screws 34 by a plurality of screws 34.

  The flange portion 32 defines one side in the A direction of the inside 2 with one side surface 40 in the A direction, and the lid body 35 has a through hole 41 in the center and one side surface 42 in the A direction. A lid body 43 made of an elliptical plate body defining the other of the inside 2 in the A direction, and an annular small-diameter projection 44 formed integrally and projecting in the A direction on the side surface 42 of the lid body 43 The lid body 43 has a projection 45 that protrudes integrally with the side surface 42 in the A direction and is concentric with the projection 44 and has a larger diameter than the projection 44. A slit or recess extending over a range corresponding to a predetermined rotational position P2 with respect to the seat portion 5 of the backrest portion 6 with respect to the rotational axis O of the body 8 to a folding rotational position P3 with respect to the seat portion 5 of the backrest portion 6. In this example, a thread extending in an arc shape around the rotation axis O is used. Tsu DOO and 46 is fixed to the seat 5 by a screw 48 through the through hole 47 with a has, containing body 7 is fixed to the seat 5 through the lid body 43 such.

  A hollow rotating body 8 that forms a space 19 for accommodating the viscous fluid 3 with the container 7 and has a cylindrical outer peripheral surface 51 and a cylindrical inner peripheral surface 52 is provided at each end of the ring in the A direction. The portions 53 and 54 are supported on the inner peripheral surface 31 of the collar portion 32 of the container 7 and the outer peripheral surface of the protrusion 44 so as to be rotatable in the R1 and R2 directions, and define the hollow portion 55 of the rotating body 8. The inner peripheral surface 52 has an unevenness (serration) 56 on one opening end side in the A direction of the hollow portion 55, and the unevenness 56 on the rotating body 61 has an unevenness (on the one end 62 side). Serration) 63 is fitted, and the rotation shaft 61 is fixed to the other one of the seat portion 5 and the backrest portion 6 of the vehicle seat on the other end side, in this example, the backrest portion 6. More specifically, the concave and convex portions 56 and the rotary shaft 61 that fits into the concave and convex portions 56 are provided via 61. The rotating body 8 connected to the backrest 6 via the projection 63 is rotated in the same direction by the rotation of the rotating shaft 61 in the R1 and R2 directions, and further the rotation of the backrest 6 in the R1 and R2 directions. Thus, the rotating body 8 is fixed to the backrest 6.

  The rotating shaft 61 includes a large-diameter portion 66 on the one end 62 side having an unevenness 63 on the outer peripheral surface, a semi-cylindrical groove 67 as a notch formed in the large-diameter portion 66 at the portion of the unevenness 63, and a large A small-diameter portion 68 on one end 62 side integral with the diameter portion 66 and a slit 69 formed in the small-diameter portion 68 are provided, and the distal end portion 70 of the small-diameter portion 68 is bifurcated by the slit 69. .

  The elastic means 15 has one end 13 disposed in the slit 46 and engaged with the lid body 43 of the container 7, and the other end 14 is inserted into a groove 67 formed in the one end 62 of the rotating shaft 61. A coil spring 75 disposed on the hollow portion 55 is provided between the one end portion 13 and the other end portion 14 to surround the small diameter portion 68 of the rotation shaft 61 while being fitted to and engaged with one end portion of the rotation shaft 61. Thus, the elastic means 15 is arranged at the other end of the one end 13 that is disposed in the slit 46 of the housing 7 and engages the housing 7 and the seat 5 and the backrest 6 of the vehicle seat 4. The other end portion 14 is engaged with and engaged with a rotating shaft 61 fixed to a certain backrest portion 6, and the coil spring 75 is one of the container 7 and the rotating body 8 at the one end portion 13. Are connected to the container 7, and the container 7 and the rotating body 8 at the other end 14. Are linked via a rotary shaft 61 to the rotary member 8 is Chino other.

  When the backrest portion 6 is rotated to the initial rotation position P0, the coil spring 75 has its one end portion 13 in contact with the bottom portion 77 at one end portion 76 of the slit 46 and prevents rotation of the one end portion 13 in the R2 direction. The torsional elastic force as the maximum elastic rotational force for rotating the backrest 6 in the R1 direction is stored, and when the backrest 6 is rotated to the predetermined rotation position P2, the backrest 6 is moved in the R1 direction. When the backrest portion 6 is rotated from the predetermined rotation position P2 to the folding rotation position P3, the one end portion 13 is rotated with the rotation of the backrest portion 6 and the one end portion 76 of the slit 46. The other end 78 is guided and moved by the slit 46.

  Thus, when the coil spring 75 rotates in the R1 direction from the initial rotation position P0 to the predetermined rotation position P2 with respect to the seat portion 5 of the backrest portion 6 toward the folding rotation position P3, the one end 13 is one end 76 of the slit 46. The torsional elastic force stored in contact with the bottom 77 is applied to the backrest 6 via the other end 14 and the rotating shaft 61 and passes through each pair of wedge spaces including a pair of wedge spaces 103 and 104 described later. While the backrest 6 is rotated in the R1 direction with respect to the seat 5 against the flow resistance of the viscous fluid 3 that rotates, the torsional elastic force stored by the rotation of the backrest 6 to the predetermined rotational position P2 is consumed. In the rotation in the R1 direction from the predetermined rotation position P2 to the folding rotation position P3 with respect to the seat portion 5 of the backrest portion 6, the one end portion 13 is separated from the one end portion 76 of the slit 46. Folding of the backrest portion 6 with respect to the seat portion 5 is performed by moving in the R1 direction toward the other end portion 78 of the lit 46 so as not to apply torsional elastic force to the backrest portion 6 and to store the torsional elastic force. In the rotation in the R2 direction toward the initial rotation position P0 from the rotation position P3 to the predetermined rotation position P2, the one end portion 13 moves away from the other end portion 78 of the slit 46 toward the one end portion 76 of the slit 46 in the R2 direction. The twisting elastic force is not applied to the backrest portion 6 and the torsional elastic force is not stored, and the initial rotational position P0 from the predetermined rotational position P2 to the initial rotational position P0 with respect to the seat portion 5 of the backrest portion 6 is set. In the rotation in the R2 direction, the one end 13 comes into contact with the bottom 77 at one end 76 of the slit 46 and is twisted between the one end 13 and the other end 14 to store the torsional elastic force. To have.

  The elastic means 18 has one end 16 wound around and locked with a screw 48, and the other end 17 is fitted into the slit 69, and the spiral wound around the other side surface 85 of the lid body 43. Thus, the spiral spring 86 is connected to the lid body 43 of the container 7 which is one of the container 7 and the rotating body 8 via the screw 48 and at the other end 17. It is connected to the rotating body 8 which is the other of the housing body 7 and the rotating body 8 via a rotating shaft 61, and the backrest portion 6 passes from the predetermined rotating position P1 through the predetermined rotating position P2 to the folding rotating position P3 in the R1 direction. When the rotary shaft 61 is also rotated in the same direction, it is wound in the reduced diameter direction to generate a gradually increasing elastic force against the rotation in the R1 direction, while the backrest portion 6 is folded to the folding rotation position P3. To a predetermined rotational position P2 If the rotary shaft 61 is rotated in the same direction after being rotated to the predetermined rotational position P1, the elastic force against the rotation in the R1 direction by gradually unwinding in the diameter increasing direction gradually decreases. Furthermore, when the backrest 6 is rotated in the R2 direction from the predetermined rotation position P1 to the initial rotation position P0 and the rotation shaft 61 is also rotated in the same direction, the backrest 6 is rewound in the diameter increasing direction and rotated in the R2 direction. When the backrest 6 is rotated from the initial rotational position P0 to the predetermined rotational position P1 in the R1 direction and the rotating shaft 61 is also rotated in the same direction while generating an elastic force that gradually increases against the above, The spiral spring 86 which is wound around the R2 direction and gradually resists rotation in the R2 direction is gradually reduced. Therefore, the spiral spring 86 which does not generate elastic force at the predetermined rotational position P1 is applied to the seat portion 5 of the backrest portion 6. Folding rotation from the predetermined rotation position P1 Up to the position P3, the elastic rotation resists the rotational force in the direction toward the folding rotation position P3 that gradually increases from the predetermined rotation position P1 due to the weight of the backrest portion 6 toward the folding rotation position P3. A force is applied to the rotation of the backrest 6 relative to the seat 5.

  The vane means 20 divides a space 19 for accommodating the viscous fluid 3 between the cylindrical inner peripheral surface 27 of the container 7 and the cylindrical outer peripheral surface 51 of the rotating body 8 into two chambers 87 and 88 and rotates. A pair of elastically flexible elastic flexible vanes 95 and 96 integrally formed on the outer peripheral surface 51 of the body 8, and two chambers 87 and 88 defined by the pair of elastic flexible vanes 95 and 96. At least one of the chambers, in this example, the two chambers 87 and 88 are further divided into two chambers 91 and 92 and two chambers 93 and 94 and integrated with the inner peripheral surface 27 of the container 7. And other elastically flexible vanes 97 and 98 formed in a conventional manner.

  In the elastic flexible vanes 95 and 96 and 97 and 98, the elastic flexible vane 95 and the elastic flexible vane 96, and the elastic flexible vane 97 and the elastic flexible vane 98 are rotational axes. Since the elastic flexible vane 95 and the elastic flexible vane 97 will be described in detail below, the elastic flexible vane 96 and the elastic flexible vane 98 will be described in detail. Is described and illustrated with the same reference numerals as those of the elastic flexible vane 95 and the elastic flexible vane 97.

  The elastic flexible vane 95 that divides the chamber 92 and the chamber 93 in the R direction that is the R1 and R2 directions and the circumferential direction is connected to the outer peripheral surface 51 of the rotating body 8 at one end, while the other end. Then, a curved convex surface 101 which faces the inner peripheral surface 25 of the container 7 and is convex in the R2 direction opposite to the relative rotation in the R1 direction of the rotating body 8 with respect to the container 7, and the convex surface 101 Correspondingly, a curved concave surface 102 connected to the outer peripheral surface 51 of the rotating body 8 at one end and extending along the convex surface 101 is provided, and gradually from the outer peripheral surface 51 toward the inner peripheral surface 25 in the R direction. The thickness is reduced and formed in an arc shape.

  On the other end side, the convex surface 101 has a pair of wedge spaces 103 and 104 facing each other in the R direction, which is also the rotational direction of the relative rotation of the rotating body 8 with respect to the container 7, and the arcuate inner peripheral surface 25 of the container 7. And an arcuate convex surface 105 having a radius of curvature smaller than the radius of curvature of the inner peripheral surface 25. The arcuate convex surface 105 is located in the R direction with the arcuate convex surface 105 in between. The two chambers 92 adjacent to each other with the width in the B direction being the radial direction of one wedge space 103 communicating with one of the two chambers 92 and 93 adjacent to each other in the R direction. And 93, the width in the radial direction of the one wedge space 103 is determined so as to gradually become narrower toward the other wedge space 104 communicating with the other chamber 93, and the other wedge space 104 B direction The width of the other wedge space 104 in the B direction is determined so that the width gradually decreases toward the one wedge space 103 in the R direction, and the viscous fluid that passes through the pair of wedge spaces 103 and 104 is determined. 3, the elastic flexible vane 95 is elastically bent and the width of the pair of wedge spaces 103 and 104 is determined by the viscosity of the elastic flexible vane 95. The viscous fluid 3 passing through 104 is rotated from the other chamber 93 to one chamber 92 in the rotation in the R1 direction with respect to the seat portion 5 of the backrest portion 6 from the initial rotation position P0 to the folding rotation position P3 via the predetermined rotation positions P1 and P2. Flowing through the pair of wedge spaces 104 and 103 narrowed by the flow and defined by the pair of wedge spaces 104 and 103 narrowed and resisting the rotation in the R1 direction. On the other hand, in the rotation in the R2 direction with respect to the seat portion 5 of the backrest portion 6 from the folding rotation position P3 to the initial rotation position P0 via the predetermined rotation positions P2 and P1, the one chamber 92 to the other It flows through the pair of wedge spaces 104 and 103 widened in the chamber 93 so as to generate a flow resistance that is defined by the pair of wedge spaces 103 and 104 widened and resists the rotation in the R2 direction. It has become.

  The concave surface 102 extends along the convex surface 101 so as to gradually approach the convex surface 101 from one end portion to the other end portion of the convex surface 101, and terminates together with the end of the convex surface 101, whereby the elastic flexible vane 95 is The base portion 106 connected to the rotating body 8 is gradually thinned from the other end portion to the free end portion 107.

  Thus, the elastic flexible vane 95 is moved from the other chamber 93 in the rotation in the R1 direction with respect to the seat portion 5 of the backrest portion 6 from the initial rotation position P0 to the folding rotation position P3 via the predetermined rotation positions P1 and P2. The viscous fluid 3 generates a flow resistance which is defined by the pair of narrowed wedge spaces 104 and 103 and resists the rotation while flowing through the pair of wedge spaces 104 and 103 narrowed in the chamber 92 On the other hand, from the folding rotation position P3 to the initial rotation position P0 via the predetermined rotation positions P2 and P1, the rotation of the backrest portion 6 in the R2 direction relative to the seat portion 5 changes from one chamber 92 to the other chamber 93. Flowing through the pair of widened wedge spaces 104 and 103 and defined by the pair of widened wedge spaces 104 and 103 and against the rotation The flow resistance against adapted to generate the viscous fluid 3.

  The elastic flexible vane 96 that partitions the chamber 91 and the chamber 94 in the R direction is formed in the same manner as the elastic flexible vane 95 and passes through the pair of wedge spaces 103 and 104 in the elastic flexible vane 96. The viscous fluid 3 also elastically deflects the elastic flexible vane 96 and determines the width in the B direction of the pair of wedge spaces 103 and 104 based on the viscosity thereof. The viscous fluid 3 passing through the pair of wedge spaces 103 and 104 in the vane 96 is rotated in the R1 direction with respect to the seat portion 5 of the backrest portion 6 from the initial rotation position P0 to the folding rotation position P3 via the predetermined rotation positions P1 and P2. When the flow passes through the pair of wedge spaces 104 and 103 narrowed from the other chamber 91 to the one chamber 94 and is defined by the pair of wedge spaces 104 and 103 narrowed, While generating flow resistance against the rotation in the R1 direction, R2 with respect to the seat portion 5 of the backrest portion 6 from the folding rotation position P3 to the initial rotation position P0 via the predetermined rotation positions P2 and P1. In the direction of rotation, it flows through the pair of wedge spaces 104 and 103 expanded from one chamber 94 to the other chamber 91 and is defined by the expanded pair of wedge spaces 103 and 104 and rotates in the R2 direction. It is designed to generate a flow resistance that resists this.

  The chamber 91 and the chamber 92 are partitioned in the R direction, and are integrally formed on the inner peripheral surface 27 of the container 7, the side surface 40 of the flange 32, the inner peripheral surface of the protrusion 44, and the side surface 42 of the lid body 43. The elastic flexible vane 97 has an arc-shaped concave surface 111 that is complementary to the convex surface 101 of the elastic flexible vane 95 so as to face the convex surface 101 of the elastic flexible vane 95, while the cross section V or An elastically flexible base 113 having a U-shaped concave surface 112 facing the concave surface 102 of the elastic flexible vane 96, and a base 113 integrally extending from the distal end of the base 113 in the R2 direction. And an elastically flexible tongue 115 that is slidably contacted with the outer peripheral surface 51 of the rotating body 8 in the R direction by an arcuate surface 114. A radius of curvature smaller than the radius of curvature of the surface 51 and the outer peripheral surface 51. A wedge space similar to the pair of wedge spaces 103 and 104 is formed between the arcuate surface 114 of the tongue 115 and the wedge space similar to the pair of wedge spaces 103 and 104 is formed. The elastic flexible vane 97 to be formed is similar to the elastic flexible vane 95 in the relative rotation of the rotating body 8 with respect to the container 7 in the R1 direction from the initial rotation position P0 of the backrest 6 toward the folding rotation position P3. , While allowing the viscous fluid 3 to flow from the chamber 91 to the chamber 92 through the pair of wedge spaces with a large resistance, the backrest 6 has a resistance against the container 7 in the R2 direction from the folding rotation position P3 to the initial rotation position P0. The relative rotation of the rotating body 8 allows the flow of the viscous fluid 3 from the chamber 92 to the chamber 91 with a small resistance.

  The elastic flexible vane 98 that partitions the chamber 93 and the chamber 94 is also formed in the same manner as the elastic flexible vane 97, and is formed between the outer peripheral surface 51 of the rotating body 8 and the arcuate surface 114 of the tongue 115. Similarly to the elastic flexible vane 97, the elastic flexible vane 98 forming the pair of wedge spaces is a rotating body 8 for the container 7 in the R1 direction from the initial rotational position P0 of the backrest portion 6 toward the folding rotational position P3. In the relative rotation, the flow of the viscous fluid 3 from the chamber 93 to the chamber 94 through the pair of wedge spaces is allowed with a large resistance, while the R2 direction from the folding rotation position P3 of the backrest portion 6 toward the initial rotation position P0 is allowed. In the relative rotation of the rotating body 8 with respect to the container 7, the flow of the viscous fluid 3 from the chamber 94 to the chamber 93 is allowed with a small resistance.

  One end face in the A direction of the elastic flexible vanes 95 and 96 is in close contact with the side surface 40 of the flange portion 32 so as to be slidable in the R1 and R2 directions. The other end surface in the direction is also in close contact with the side surface 42 of the lid 35 so as to be slidable in the R1 and R2 directions, and the base 113 is integrally formed on the inner peripheral surface 27 of the container 7 in the cylindrical body 28. The portions of the elastic flexible vanes 97 and 98 thus formed are formed integrally with the side surface 40 of the flange portion 32 at one end surface in the A direction, and the base portion 113 is the inner peripheral surface 27 of the container 7 at the protrusion 45. The elastic flexible vanes 97 and 98 formed integrally with each other have one end surface 116 in the A direction, and the base 113 is integrally formed on the inner peripheral surface 27 of the container 7 in the cylindrical body 28. The other of the elastic flexible vanes 97 and 98 in the A direction It is in contact with the snugly liquid-tight to the surface 117, are integrally formed on the side surface 42 of the lid 35 at the other end face of the A direction.

  The viscous fluid 3 passing through the pair of wedge spaces including the pair of wedge spaces 103 and 104 is in the R1 direction with respect to the seat portion 5 of the backrest portion 6 from the initial rotation position P0 to the folding rotation position P3 via the predetermined rotation positions P1 and P2. While flowing through a pair of narrowed wedge spaces in the rotation of the cylinder and generating a flow resistance that is defined by the pair of narrowed wedge spaces and resists rotation in the R1 direction, The pair of widened flow that flows through the pair of wedge spaces widened in the rotation in the R2 direction with respect to the seat portion 5 of the backrest portion 6 from the folding rotational position P3 to the initial rotational position P0 via the predetermined rotational positions P2 and P1. A flow resistance that is defined by the wedge space and resists the rotation in the R2 direction is generated.

  Between the inner peripheral surface 31 of the flange 32 and the end portion 53 of the rotating body 8 in the A direction, between the end portion 33 of the cylindrical body 28 and the protrusion 45 fitted to the end portion 33, and A of the rotating body 8. Between the directional end 54 and the projection 44, the leakage of the viscous fluid 3 to the chambers 91 and 92 and the chambers 93 and 94, and the chambers 91 and 92 and the chambers 93 and 94 to the outside of the container 7, respectively. A seal ring 118 that prevents leakage of the viscous fluid 3 is disposed.

  In the vehicle seat 4 including the seat portion 5 attached to the vehicle body 121 of the automobile and the backrest portion 6 rotatably connected to the seat portion 5, the backrest portion 6 is the automobile at the predetermined rotational position P <b> 1. A predetermined angle β with respect to a vertical plane at a predetermined rotational position P1 from an initial rotational position P0 tilted backward by a predetermined angle α, for example α = 25 °, with respect to a vertical plane orthogonal to the front-rear direction, for example β = It is connected to the seat portion 5 so as to be rotatable in the directions R1 and R2 about the rotation axis O up to a folding rotation position P3 inclined forward by 90 °, and at the initial rotation position P0, an unlocking lock mechanism (not shown) is provided. The rotation in the R1 direction is prohibited by this, and when the lock mechanism is unlocked, the pair of wedge spaces 103 is moved from the initial rotation position P0 to the predetermined rotation position P1 rotated in the R1 direction by α = 25 °. And 104 are rotated in the R1 direction by the torsional elastic force of the coil spring 75 and the reduced elastic force of the spiral spring 86 in the R1 direction against the flow resistance of the relatively large viscous fluid 3 passing through each pair of wedge spaces. From the predetermined rotational position P1 to the predetermined rotational position P2 rotated in the R1 direction by a predetermined angle γ, for example, γ = α + 10 °, in other words, 10 ° forward of the vertical plane at the predetermined rotational position P1. Up to a predetermined rotational position P2 tilted to the right, the flow resistance of the relatively large viscous fluid 3 passing through each pair of wedge spaces including the pair of wedge spaces 103 and 104, and the diameter expansion elastic force of the spiral spring 86 in the R2 direction Against this, it is rotated in the R1 direction by the gradually increasing rotational force in the R1 direction based on the weight of the backrest 6 and the torsional elastic force of the coil spring 75, and is folded from the predetermined rotational position P2. Up to the rotational position P3, the flow resistance of the relatively large viscous fluid 3 passing through each pair of wedge spaces including the pair of wedge spaces 103 and 104 and the diameter expansion elastic force of the spiral spring 86 in the R2 direction are resisted. While rotating in the R1 direction due to the gradually increasing rotational force in the R1 direction based on the weight of the backrest portion 6, it gradually decreases from the folding rotation position P3 to the predetermined rotation position P2 based on the weight of the backrest portion 6. A relatively small viscous fluid that passes through each pair of wedge spaces 103 including the pair of wedge spaces 103 and 104 under the assistance of the gradually increasing diameter-expanding elastic force of the spiral spring 86 against the rotational force in the R1 direction. 3 is manually rotated against the flow resistance 3 in the R2 direction, and gradually decreases from the predetermined rotation position P2 to the predetermined rotation position P1 based on the weight of the backrest portion 6 in the R1 direction. The flow of the relatively small viscous fluid 3 that passes through each pair of wedge spaces including the pair of wedge spaces 103 and 104 under the assistance of the diameter-expanding elastic force that gradually decreases in the R2 direction of the spiral spring 86 against the rotational force. It is manually rotated in the R2 direction against the resistance and the torsional elastic force in the R1 direction of the coil spring 75 that gradually increases. From the predetermined rotation position P1 to the initial rotation position P0, the wedge space 103 is rotated. And the resistance of the relatively small viscous fluid 3 passing through 104 and the torsional elastic force in the R1 direction of the coil spring 75 and the reduced diameter elastic force in the R1 direction of the spiral spring 86 in the R2 direction manually. The coil spring 75 is made to rotate, and the torsional elastic force and the reduced-diameter elastic force of the spiral spring 86 are stored in the coil spring 75, respectively.

  In the rotary damper 1 that functions as a one-way rotary damper, the backrest 6 is twisted elastically by the coil spring 75 when the lock mechanism is unlocked at the rotational position of the rotating body 8 (corresponding to the initial rotational position P0) shown in FIG. The rotating body 8 is rotated in the R1 direction with respect to the containing body 7 so as to expand the chambers 92 and 94 while the chambers 91 and 93 are contracted while being rotated in the R1 direction by the force and the reduced diameter elastic force of the spiral spring 86. In doing so, the pressure of the viscous fluid 3 is applied to the concave surface 102 of the elastic flexible vanes 95 and 96 and the concave surface 112 of the elastic flexible vanes 97 and 98, so that the elastic flexible vanes 95 and 96 are applied. The other end portion of the free end portion 107 side approaches the inner peripheral surfaces 25 and 26 of the container 7, and the tongue portions 115 of the elastic flexible vanes 97 and 98 approach the outer peripheral surface 51 of the rotating body 8. Space 10 As a result, the elastic flexible vanes 95 and 96 and the elastic flexible vanes 97 and 98 are elastically deformed so that each pair of wedge spaces including the pair of wedge spaces 104 and 104 is reduced. As a result, the viscous fluid 3 is reduced. , 104 through each pair of wedge spaces, including chambers 93 and 91, respectively, and chambers 92 and 94, respectively, and chambers 91 and 93, respectively, to chambers 92 and 94, respectively. And 104, a large braking force due to a relatively large flow resistance of the viscous fluid 3 passing through each pair of wedge spaces is applied to the rotation of the rotating body 8 in the R1 direction, and the backrest 6 is slowly rotated in the same direction to a predetermined rotational position P1 and While rotating to the folding rotation position P3 via P2, the backrest 6 is manually rotated in the R2 direction at the rotation position of the rotating body 8 shown in FIG. 12 (corresponding to the folding rotation position P3). When the rotating body 8 is rotated in the R2 direction with respect to the container 7 so as to enlarge the chambers 91 and 93 while reducing the chambers 92 and 94, the respective bending of the elastic flexible vanes 95 and 96 Since the pressure of the viscous fluid 3 is applied to the convex surface 101 and the concave surface 111 of the elastic flexible vanes 97 and 98, the free end 107 side of the elastic flexible vanes 95 and 96 is the inner periphery of the container 7. From the surfaces 25 and 26, the tongues 115 of the elastic flexible vanes 97 and 98 are elastically spaced apart from the outer peripheral surface 51 of the rotating body 8 so as to expand each pair of wedge spaces including the pair of wedge spaces 103 and 104. As a result of the elastic deformation of the flexible vanes 95 and 96 and the elastic flexible vanes 97 and 98, the viscous fluid 3 passes through each pair of wedge spaces, including the pair of expanded wedge spaces 103 and 104, and the chambers 92 and 94. From each of the rooms 93 and 91 and the chambers 92 and 94 flow into the chambers 91 and 93, respectively, and pass through each pair of wedge spaces including the expanded pair of wedge spaces 103 and 104. Since the small braking due to is applied to the rotation of the rotating body 8 in the R2 direction, the backrest 6 can be rotated to the predetermined rotational position P2 by a small manual force, and the coil from the predetermined rotational position P2 to the initial rotational position P0 can be rotated. In order to store the torsional elastic force in the spring 75, gradually increasing elastic braking by the coil spring 75 is performed, and from the predetermined rotation position P1 to the initial rotation position P0, gradually increasing elastic braking of the spiral spring 86 is performed by the manual force R2. It is designed to receive direction rotation.

  According to the rotary damper 1, when the backrest 6 is rotated from the initial rotation position P 0 to the predetermined rotation position P 1, the backrest 6 can be easily rotated with the assistance of the coil spring 75 and the spiral spring 86. When the backrest portion 6 is rotated from the predetermined rotation position P1 to the folding rotation position P3, the abrupt rotation of the backrest portion 6 due to a rotational force that gradually increases toward the folding rotation position P3 based on the weight of the backrest portion 6. Can be prevented by the spiral spring 86, and when the backrest portion 6 is rotated from the initial rotation position P0 to the folding rotation position P3, a large flow resistance can be generated in the viscous fluid 3 by the vane means 20. As a result, the backrest portion 6 can provide an appropriate resistance to rotation in the direction toward the folding rotation position P3, and the back at the folding rotation position P3. On the other hand, when the backrest 6 can be manually rotated from the folding rotation position P3 to the initial rotation position P0, in addition to the assistance by the spiral spring 86, the viscous fluid generated by the vane means 20 can be avoided. As a result, the backrest portion 6 can be manually folded and easily rotated from the rotation position P3 to the initial rotation position P0.

  Further, in the rotary damper 1 functioning as a one-way damper, the viscous fluid 3 whose viscosity decreases as the temperature rises includes a pair of wedges including a pair of wedge spaces 103 and 104 when the rotating body 8 rotates in the R1 and R2 directions. For example, when the viscous fluid 3 whose viscosity has increased from the normal temperature at a low temperature passes through the wedge spaces 103 and 104 because it passes through the space, the viscous fluid 3 in the wedge spaces 103 and 104 is used. As the pressure increases, the elastic flexible vane 95 is greatly elastically deformed so that the free end 107 side of the elastic flexible vane 95 is further away from the inner peripheral surface 25 of the container 7 than at normal temperature, so that the wedge spaces 103 and 104 are formed. As a result of being greatly expanded compared with that at room temperature, the flow resistance is increased due to an increase in the viscosity of the viscous fluid 3 itself, and the flow resistance is decreased due to the expansion of the wedge spaces 103 and 104. Nevertheless, braking at normal temperature can be maintained, but when the viscous fluid 3 whose viscosity is lower than that at normal temperature passes through the wedge spaces 103 and 104 at a high temperature, the pressure of the viscous fluid in the wedge spaces 103 and 104 decreases. As a result, the elastic flexible vane 95 is elastically deformed to be small and the wedge spaces 103 and 104 are narrowed so that the free end 107 side of the elastic flexible vane 95 approaches the inner peripheral surface 25 of the container 7 from the normal temperature. Due to the decrease in the flow resistance due to the decrease in the viscosity of the viscous fluid 3 itself and the increase in the flow resistance due to the reduction of the wedge spaces 103 and 104, it becomes possible to maintain the braking at the normal temperature regardless of the high temperature. As a result of being able to obtain braking that does not depend on temperature and that does not change at high or low temperatures, the backrest 6 is folded to the folding rotation position P3 by the torsional elastic force of the coil spring 75 and reliably rotated. The backrest 6 can be rotated back to its initial rotational position P0 by a small manual force it is possible to.

  The rotary damper 1 described above has two pairs of elastic flexible vanes 95 and 96, and 97 and 98. However, the present invention provides a pair of elastic flexible vanes 95 and 96 and an elastic flexible vane 97. Or 98 and three or more pairs of elastic flexible vanes.

DESCRIPTION OF SYMBOLS 1 Rotary damper 2 Inside 3 Viscous fluid 4 Vehicle seat 5 Seat part 6 Backrest part 7 Container 8 Rotating body 13, 16 One end part 14, 17 Other end part 15, 18 Elastic means 19 Space 20 Vane means

Claims (11)

  The viscous fluid is housed inside and fixed to one of the seat portion of the vehicle seat and the backrest portion rotatably connected to the seat portion so as to be rotatable between the initial rotation position and the folding rotation position. It is rotatably arranged inside the container so as to form a space for accommodating the viscous fluid between the container and the container, and is fixed to the other one of the seat part and the backrest part of the vehicle seat. A rotating body that is connected to one of the seat portion and the backrest portion of the vehicle seat at one end, and is connected to the other of the seat portion and the backrest portion of the vehicle seat at the other end. The direction from the initial rotation position with respect to the seat portion of the backrest portion around the rotation axis of the rotating body relative to the housing body to the first predetermined rotation position between the initial rotation position and the folding rotation position toward the folding rotation position at the backrest portion Elasticity of A first elastic means for applying a rotational force, and one end connected to one of the seat and backrest of the vehicle seat, while the other end of the seat and backrest of the vehicle seat Connected to the other side and the backrest portion from the second predetermined rotation position between the initial rotation position and the folding rotation position with respect to the seat portion of the backrest portion around the rotation axis of the rotating body with respect to the container to the folding rotation position. In the relative rotation of the rotating body with respect to the container in the direction from the initial rotation position of the backrest to the folding rotation position, the second elastic means for applying an elastic rotation force in the direction toward the initial rotation position, a large flow resistance is obtained. In the relative rotation of the rotating body relative to the container in the direction from the folding rotation position of the backrest portion to the initial rotation position, a flow resistance smaller than the flow resistance is generated in the viscous fluid, respectively. Receptor to accommodate a viscous fluid and vanes means arranged in the space and the rotary damper for a vehicle seat between the rotating body.   In the rotation in the direction toward the folding rotation position from the initial rotation position to the first predetermined rotation position with respect to the seat portion of the backrest portion, the first elastic means applies an elastic rotational force in the direction toward the folding rotation position to the backrest portion. Rotating the backrest with respect to the seat between the first predetermined rotation position and the folding rotation position while rotating the backrest relative to the seat against the flow resistance of the viscous fluid The rotary damper for a vehicle seat according to claim 1, wherein in the position, the application of the elastic rotational force in the direction toward the folding rotational position to the backrest portion is released.   The container extends over a range corresponding to a range from a first predetermined rotation position with respect to the seat portion of the backrest portion with respect to the rotation axis of the rotating body relative to the housing body to a folding rotation position with respect to the seat portion of the backrest portion. The rotating body has a rotating shaft fixed to the other of the seat portion and the backrest portion of the vehicle seat, and the first elastic means is a slit of the housing body. Alternatively, the vehicle seat according to claim 1, wherein the vehicle seat has one end portion that is disposed in the recess and engages with the housing body, and the other end portion that engages and engages with the rotation shaft of the rotating body. Rotary damper.   The first elastic means includes a coil spring that is connected to one of the container and the rotating body at one end and is connected to the other of the container and the rotating body at the other end. The rotary damper for vehicle seats as described in any one of Claim 1 to 3.   The second elastic means changes from the second predetermined rotation position due to the weight of the backrest portion to the folding rotation position from the second predetermined rotation position with respect to the seat portion of the backrest portion to the folding rotation position. The rotary for a vehicle seat according to any one of claims 1 to 4, wherein an elastic rotational force against a rotational force in a direction toward the folding rotational position is applied to the rotation of the backrest portion relative to the seat portion. damper.   The second elastic means includes a spiral spring that is connected to one of the container and the rotating body at one end and connected to the other of the container and the rotating body at the other end. The rotary damper for vehicle seats as described in any one of Claims 1-5.   The vane means divides a space for accommodating the viscous fluid between the cylindrical inner peripheral surface of the container and the cylindrical outer peripheral surface of the rotating body into two chambers and is formed integrally with the outer peripheral surface of the rotating body. A pair of elastic flexible vanes and at least one of the two chambers defined by the pair of elastic flexible vanes are further divided into two chambers and formed integrally on the inner peripheral surface of the container. The rotary damper for a vehicle seat according to any one of claims 1 to 6, further comprising another elastic flexible vane.   Each of the pair of elastic flexible vanes has a curved convex surface that is connected to the outer peripheral surface of the rotating body at one end and is convex in a direction opposite to the relative rotation in one direction of the rotating body with respect to the container. And a curved concave surface that is connected to the outer peripheral surface of the rotating body at one end and extends along the convex surface corresponding to the convex surface, and the convex surface on the other end side with respect to the container A pair of wedge spaces facing each other in the rotation direction of the relative rotation of the rotating body are formed as arcuate convex surfaces between the inner peripheral surface of the container, and the arcuate convex surfaces are relative to the container relative to the container. The radial width of one wedge space communicating with one of the two adjacent chambers with the arcuate convex surface in the rotational direction of the general rotation is the rotational direction of the relative rotation of the rotating body with respect to the container Two adjacent chambers with the arc-shaped convex surface in between The radial width of the one wedge space is determined so that the width gradually decreases toward the other wedge space communicating with the other chamber, and the rotation of the rotating body relative to the container is rotated. The radial width of the other wedge space communicating with the other of the two adjacent chambers with the arcuate convex surface in the direction is the arcuate convex surface in the rotational direction of the relative rotation of the rotating body with respect to the container The width in the radial direction of the other wedge space is determined so as to gradually become narrower toward one wedge space communicating with one of the two adjacent chambers. The viscous fluid that passes through the wedge space elastically deflects each of the pair of elastic flexible vanes and determines the radial width of the pair of wedge spaces based on the viscosity thereof. Each of the flexible vanes is first from the initial rotational position. And the pair of narrowed wedge spaces flowing through the pair of wedge spaces narrowed from the other chamber to the one chamber in the rotation of the backrest portion to the folding rotational position via the second predetermined rotational position. And a flow resistance against the rotation is generated in the viscous fluid, while the backrest portion from the folding rotation position to the initial rotation position via the first and second predetermined rotation positions is generated. In the rotation with respect to the seat portion, the viscous fluid has a flow resistance defined by the pair of widened wedge spaces flowing from one chamber to the other chamber and resisting the rotation. The rotary damper for a vehicle seat according to claim 7, wherein the rotary damper is for a vehicle.   The rotary damper for a vehicle seat according to claim 8, wherein the concave surface extends along the convex surface so as to gradually approach the convex surface from one end portion to the other end portion of the convex surface.   The rotary damper for a vehicle seat according to claim 8 or 9, wherein the arcuate convex surface has a radius of curvature smaller than that of the cylindrical inner peripheral surface of the container.   The other elastic flexible vanes are elastically flexible bases integrally formed on the inner peripheral surface of the container, and are formed integrally with the base and face the outer peripheral surface of the rotating body. The rotary damper for a vehicle seat according to any one of claims 7 to 10, further comprising an elastically flexible tongue portion having an arcuate surface.

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