JP5201102B2 - Rotary damper for vehicle seat - Google Patents

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

    In vehicle seats for automobiles, when the backrest part to which the elastic rotational force in the direction toward the folding rotational position is always applied is placed at the folding rotational position, the backrest part is initially rotated against the elastic rotational force. The lock mechanism held in position is unlocked and the backrest portion is rotated toward the folding rotation position by elastic rotational force, but such elastic rotational force is applied to the backrest portion to the folding rotation position. Even if the rotary damper is designed to brake the rotation of the backrest, the folding rotation position is determined by the elastic torque and the rotational force (rotational moment) of the backrest before the folding rotation position. Therefore, there is a possibility that the backrest part may collide with the stop member that stops the backrest part.

  The present invention has been made in view of the above-described points, and an object of the present invention is to provide a rotary damper for a vehicle seat that can bring a backrest portion into a folding rotation position without impact.

  A rotary damper for a vehicle seat according to the present invention is provided at one of a seat portion of a vehicle seat and a backrest portion rotatably connected to the seat portion so as to be rotatable between an initial rotation position and a folding rotation position. A space that accommodates a viscous fluid between a container body that is fixed and has a cylindrical inner peripheral surface, and a cylindrical inner peripheral surface of the container and a cylindrical outer peripheral surface that is concentric with the inner peripheral surface. A rotating body that is disposed in the interior of the housing so as to be rotatable relative to the housing and is fixed to the other one of the seat portion and the backrest portion of the vehicle seat, and a backrest portion The relative rotation in one direction of the rotating body with respect to the container in the direction from the initial rotation position toward the folding rotation position causes a large flow resistance to the viscous fluid, and the container in the direction from the folding rotation position of the backrest toward the initial rotation position. Rotating body against In the relative rotation in the other direction, which is opposite to the relative rotation in one direction, in order to generate a flow resistance smaller than the flow resistance, the cylindrical inner peripheral surface of the container and the rotary body The vane means disposed in the space for accommodating the viscous fluid between the cylindrical outer peripheral surface and one end connected to one of the seat portion and the backrest portion of the vehicle seat, while the other end portion is connected to the vehicle. Between the initial rotation position and the folding rotation position from the initial rotation position to the seat portion of the backrest portion that is connected to the other one of the seat portion and the backrest portion of the seat and is centered on the rotation axis of the rotating body with respect to the container Elastic means for applying an elastic rotational force in a direction toward the rotational position by folding the backrest to the predetermined rotational position.

  According to the rotary damper for a vehicle seat according to the present invention, the elastic means is located 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 around the rotation axis of the rotating body with respect to the housing body. An elastic rotational force in a direction toward the folding rotational position is applied to the backrest portion up to a predetermined rotational position, and the vane means is configured to move the rotating body relative to the container in the direction from the initial rotational position of the backrest portion to the folding rotational position. In the relative rotation in one direction, a large flow resistance is exerted on the viscous fluid in a direction opposite to the relative rotation in one direction of the rotating body relative to the container in the direction from the folding rotation position of the backrest to the initial rotation position. In the relative rotation in the other direction, a flow resistance smaller than the flow resistance is generated, so that the backrest portion is in the initial rotation position. When rotating to a predetermined rotation position, the backrest part can be easily rotated by elastic means, and when rotating the backrest part from the predetermined rotation position to the folding rotation position, folding rotation based on the weight of the backrest part While the backrest portion can be rotated to the folding rotation position by the rotational force that gradually increases toward the position, the viscosity generated by the vane means when the backrest portion is manually rotated from the folding rotation position to the predetermined rotation position. As a result of reducing the flow resistance of the fluid, the backrest can be easily manually folded from the rotation position to the predetermined rotation position, and when the backrest is further rotated manually from the predetermined rotation position to the initial rotation position. In the direction toward the rotational position when folded into the elastic means under the reduced flow resistance of the viscous fluid The elastic rotation force can be avoided clash to stop member or the like at the initial rotational position it is possible to 蓄.

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

  According to the rotary damper for a vehicle seat provided with such elastic means, it is possible to avoid a collision with the stop member at the folding rotation position of the backrest portion, and to bring the backrest portion to the folding rotation position without impact. .

  In a preferred example, the container extends over a range corresponding to a predetermined 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 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 one of the seat portion and the backrest portion of the vehicle seat, and the elastic means is provided with the slit or the concave portion of the housing body. One end portion that is disposed at a position and engages with the container, and the other end portion that is fitted and engaged with the rotation shaft of the rotating body.

  The elastic means may include a coil 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.

  In another preferred example of the present invention, 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 the rotating body. A pair of elastic flexible vanes integrally formed on the outer peripheral surface of the two and at least one of the two chambers partitioned by the pair of elastic flexible vanes is further divided into two chambers and a container Each of the pair of elastic flexible vanes is connected to the outer peripheral surface of the rotating body at one end and the container. A curved convex surface convex in the opposite direction to the relative rotation in one direction of the rotating body with respect to the surface, and at one end corresponding to the convex surface is connected to the outer peripheral surface of the rotating body and extends along the convex surface Curved convex surface, and the convex surface is converged on the other end side. A pair of wedge spaces facing each other in the rotational direction of the relative rotation of the rotating body with respect to the body are arcuate convex surfaces that form between the inner peripheral surface of the container and the arcuate convex surface is a rotating body with respect to the container In the rotation direction of the relative rotation of the rotating body, the radial width of one wedge space communicating with one of the two adjacent chambers with the arcuate convex surface in between is the rotation of the rotating body relative to the container The radial width of the one wedge space is gradually narrowed toward the other wedge space communicating with the other of the two adjacent chambers with the arcuate convex surface in the direction. And the radial width of the other wedge space communicating with the other of the two adjacent chambers with the arcuate convex surface in the rotational direction of the relative rotation of the rotating body relative to the containing body Rotation of relative rotation of rotating body with respect to body The radial width of the other wedge space is gradually narrowed toward the one wedge space communicating with one of the two adjacent chambers with the arcuate convex surface therebetween. The viscous fluid that passes 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 according to the viscosity. Each of the pair of elastic flexible vanes includes a pair of wedges that are narrowed from one chamber to the other during rotation of the backrest from the initial rotation position to the folding rotation position via the predetermined rotation position. The viscous fluid is adapted to generate a flow resistance that is defined by the pair of narrowed wedge spaces flowing through the space and resists the rotation, while passing from the folding rotation position to the predetermined rotation position. Initial rotational position The rotation of the backrest to the seat with respect to the seat portion is defined by the pair of widened wedge spaces and flows through the pair of widened wedge spaces from one chamber to the other chamber and resists the rotation. The flow resistance is generated in the viscous fluid.

  According to the rotary damper for a vehicle seat according to such an example, in the two chambers divided by the pair of elastic flexible vanes and adjacent in the rotation direction of the relative rotation of the rotating body with respect to the receiving body, One chamber located on the relative rotation side in the other direction opposite to the relative rotation in one direction of the rotating body with respect to is enlarged and the other chamber on the relative rotation side in one direction of the rotating body with respect to the container When the rotating body is rotated with respect to the container so as to reduce, the pressure of the viscous fluid is applied to the concave surfaces of the pair of elastic flexible vanes. As a result of each of the pair of elastic flexible vanes being elastically deformed such that the other end side approaches the inner peripheral surface of the container and the pair of wedge spaces are reduced, the viscous fluid is reduced in the pair of wedge spaces. One through the other chamber Large damping by the viscous fluid flowing into the chambers and passing through the reduced pair of wedge spaces is given to the rotation of the rotating body, while one chamber is contracted and the other chamber is expanded. When the rotating body is rotated, the pressure of the viscous fluid is applied to the curved convex surfaces of the pair of elastic flexible vanes, so that the other end portions of the pair of elastic flexible vanes. As a result of elastic deformation of each of the pair of elastic flexible vanes so that the side is separated from the inner peripheral surface of the container and widens the pair of wedge spaces, the viscous fluid passes through the pair of widened wedge spaces to the other chamber. From the first to the other chamber, a small braking force by the viscous fluid passing through the pair of expanded wedge spaces is applied to the rotation of the rotating body to operate as a one-way damper.

  In this example, since the viscous fluid whose viscosity decreases as the temperature rises passes through the pair of wedge spaces in the rotation of the rotating body, for example, the viscosity increases at a lower temperature than at normal temperature (20 ° C.). When the viscous fluid passes through the pair of wedge spaces, the other end side of each of the pair of elastic flexible vanes is separated from the inner peripheral surface of the container by increasing the pressure of the viscous fluid in the pair of wedge spaces. Each of the pair of elastic flexible vanes is elastically deformed to widen the pair of wedge spaces. As a result, the viscosity of the viscous fluid itself increases and the fluid flow resistance decreases due to the expansion of the pair of wedge spaces. While the normal temperature braking can be maintained, when a viscous fluid whose viscosity is lower than that at normal temperature passes through a pair of wedge spaces at a high temperature, a pair of elastic Each other end of the flexible vane accommodates As a result, the pair of elastic flexible vanes are elastically deformed so as to approach the inner peripheral surface of the pair, and the pair of wedge spaces are narrowed. As a result, braking at normal temperature can be maintained regardless of high temperature, and thus braking generated does not depend on temperature, and braking that does not change at both high and low temperatures can be obtained.

  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 has a radius of curvature smaller than the radius of curvature of the cylindrical inner peripheral surface. have.

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

  In each of such other elastic flexible vanes, the tongue portion is a circle that forms a pair of wedge spaces facing each other in the rotational direction of the relative rotation of the rotating body with respect to the container and the outer peripheral surface of the rotating body. The arc-shaped concave surface may have an arc-shaped concave surface, and the arc-shaped concave surface communicates with one of the two chambers adjacent to each other with the arc-shaped concave surface interposed in the rotational direction of the relative rotation of the rotating body with respect to the container. The radial width of one wedge space such that the radial width of one wedge space gradually decreases toward the other wedge space communicating with the other of the two adjacent chambers. And the radial width of the other wedge space communicating with the other of the two adjacent chambers is directed toward one wedge space communicating with one of the two adjacent chambers. The width of the other wedge space in the radial direction so that it gradually becomes narrower. The viscous fluid that passes through the pair of wedge spaces elastically deflects each of the other elastic flexible vanes, and the radial width of the pair of wedge spaces is determined by the viscosity. It may be.

  In one preferred example, the elastic means is disposed coaxially with the rotating body in the hollow portion of the rotating body.

  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. It is preferable that the rotating body and the container in which each elastic flexible vane is integrally formed are formed of a synthetic resin material capable of imparting appropriate elasticity to each elastic flexible vane.

  In the present invention, the housing body may be connected to the backrest portion, while the rotating body may be connected to the seat portion, and the housing body may be rotated with respect to the rotating body according to the rotation of the backrest portion. The rotating body may be connected to the backrest portion, and the rotating body may be rotated relative to the housing body according to the rotation of the backrest portion. The connection may be performed directly or indirectly via a rotating shaft, a gear, or the like.

  ADVANTAGE OF THE INVENTION According to this invention, the rotary damper for vehicle seats which can fold a backrest part and bring it to a rotation position without an impact can be provided.

FIG. 1 is a cross-sectional explanatory view taken along the line II of FIG. 2 of a preferred example of the present invention. 2 is a cross-sectional explanatory view taken along the line II-II in FIG. 4 of the example shown in FIG. 3 is a cross-sectional explanatory view taken along the line III-III in FIG. 4 of the example shown in FIG. FIG. 4 is a front view of the example shown in FIG. FIG. 5 is a rear view of the example shown in FIG. FIG. 6 is a perspective view of the example shown in FIG. FIG. 7 is a partially enlarged explanatory view of the example shown in FIG. FIG. 8 is an explanatory diagram in which a rotating shaft is attached to the example shown in FIG. FIG. 9 is a perspective view of the rotating shaft shown in FIG. FIG. 10 is an explanatory diagram of an example in which the example shown in FIG. 1 is mounted on a vehicle seat. FIG. 11 is a diagram for explaining the operation of the example shown in FIG. FIG. 12 is a diagram for explaining the operation 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 the present example rotates with a synthetic resin container 3 having a cylindrical inner peripheral surface 2, an inner peripheral surface 2, and the inner peripheral surface 2. A space 6 is formed in the housing 3 so as to form a space 6 for housing a viscous fluid 5 made of silicone oil or the like, the viscosity of which decreases with an increase in temperature, with the cylindrical outer peripheral surface 4 concentric with respect to the axis O. A synthetic resin-made rotating body 7 that is arranged to be rotatable in the R1 and R2 directions relative to the container 3 about the rotation axis O, and a relative relationship in one direction of the rotating body 7 with respect to the container 3 Rotation in the R1 direction of the rotating body 7 with respect to the container 3 in this example, a large flow resistance is exerted on the viscous fluid 5 in a direction opposite to the relative rotation of the rotating body 7 with respect to the container 3 in one direction. In the relative rotation in the other direction, in this example, the rotation with respect to the container 3 7 in the R2 direction, the vane means 8 disposed in the space 6 and the seat portion 11 and the backrest portion 12 of the vehicle seat 10 at the one end portion 9 in order to generate a flow resistance smaller than the flow resistance. One of them is connected to the seat portion 11 in this example, while the other end portion 13 is connected to the other of the seat portion 11 and the backrest portion 12 of the vehicle seat, in this example, the backrest portion 12 and the container. 3 is folded at the backrest portion 12 from the initial rotation position P0 relative to the seat portion 11 of the backrest portion 12 around the rotation axis O of the rotary body 7 to the predetermined rotation position P1 between the initial rotation position P0 and the folding rotation position P2. And elastic means 14 for applying an elastic rotational force in the R1 direction, which is a direction toward the rotational position P2.

  One of the seat portion 11 and the back portion 12 that is rotatably connected to the seat portion 11 in the R1 and R2 directions so as to be rotatable between the initial rotation position P0 and the folding rotation position P2, in this example, the seat portion The container 3 fixed to the cylinder 11 has a cylindrical portion 15 having a cylindrical inner peripheral surface 2 and an annular end portion 16 in the A direction that is the axial direction of the cylindrical portion 15 in the radial direction. A flange portion 19 having an inner peripheral surface 18 that is integrally formed toward the direction and defining the through hole 17, and a plurality of screws 21 on the other annular end portion 20 in the A direction of the cylindrical portion 15. And a fixed lid 22.

  The flange portion 19 defines one side in the A direction of the space 6 with one side surface 25 in the A direction, and the lid body 22 has a through hole 31 in the center and one side surface 32 in the A direction. A lid body 33 composed of an elliptical plate body defining the other of the inside 2 in the A direction; and an annular small-diameter projection 34 formed integrally and projecting in the A direction on the side surface 32 of the lid body 33 , Projecting in the A direction integrally with the side surface 32 and formed concentrically with the projection 34 and having a projection 35 having a diameter larger than that of the projection 34. The lid body 33 fixed to the end portion 20 with a plurality of screws 21 is the backrest portion 12 from a predetermined rotational position P1 with respect to the seat portion 11 of the backrest portion 12 around the rotation axis O of the rotating body 7 with respect to the housing 3. The range corresponding to the folding rotation position P2 with respect to the seat portion 11 A slit or recess extending over the slit, in this example, a slit 36 extending in an arc shape around the rotation axis O and a through hole 37, and a seat portion 11 by a screw 38 passing through the through hole 37. The container 3 is fixed to the seat portion 11 through such a lid body 33.

  The outer peripheral surface 4 that forms the space 6 between the inner peripheral surface 2 and the inner peripheral surface 42 that defines the hollow portion 41 and the other of the seat portion 11 and the backrest portion 12, in this example, the backrest portion 12. The fixed hollow rotator 7 rotates in the R1 and R2 directions on the inner peripheral surface 18 of the flange portion 19 and the outer peripheral surface of the protrusion 34 at the annular end portions 43 and 44 in the axial direction A. The inner peripheral surface 42 which is supported so as to be free and has a hollow portion 41 has an unevenness (serration) 45 on one opening end side in the axial direction A of the hollow portion 41. Such unevenness 45 is fitted with an unevenness (serration) 53 on the one end 52 side of the rotating shaft 51, and the rotating shaft 51 is connected to the seat 11 and the seat 11 in the R1 and R2 directions on the other end. Of the backrest portion 12 rotatably connected to the backrest portion 12, in this example, the backrest portion 12 The rotating body 7 that is fixed and connected to the backrest 12 via the rotation shaft 51, more specifically, the unevenness 45 and the unevenness 53 of the rotation shaft 51 that fits the unevenness 45 is The rotating body 7 is fixed to the backrest portion 12 in this manner by rotating in the R1 and R2 directions of 51 and thus rotating in the same direction by the rotation of the backrest portion 12 in the R1 and R2 directions.

  The rotary shaft 51 has a large-diameter portion 56 on one end 52 side having an unevenness 53 on the outer peripheral surface, and a semi-cylindrical notch (groove) as a notch formed in the large-diameter portion 56 at the portion of the unevenness 53. 57 and a small-diameter portion 58 on one end 52 side that is inserted into the through-hole 31 of the lid body 33 and is supported by the lid body 33 so as to be slidable and rotatable in the R1 and R2 directions. It is equipped with.

  Between the inner peripheral surface 18 of the flange portion 19 and the end portion 43 of the rotating body 7 in the axial direction A, between the end portion 20 of the cylindrical body 15 and the protrusion 35 fitted to the end portion 20, and of the rotating body 7. A seal ring 60 that prevents leakage of the viscous fluid 5 from the space 6 to the outside of the container 3 and the rotating body 7 is disposed between the end 44 in the axial direction A and the protrusion 34.

  In the rotation in the R1 direction, which is the direction from the initial rotation position P0 of the backrest 12 to the folding rotation position P2, a large flow resistance is exerted on the viscous fluid 5, and in the direction from the folding rotation position P2 of the backrest 12 to the initial rotation position P0. In the rotation in a certain R2 direction, the vane means 8 for generating a flow resistance smaller than the flow resistance is the cylindrical inner peripheral surface 2 of the container 3 and the cylindrical shape of the rotary body 7 concentric with the inner peripheral surface 2. A pair of annular spaces 6 inside the housing 3 for housing the viscous fluid 5 between the outer circumferential surface 4 and the two outer chambers 61 and 62 and integrally formed on the outer circumferential surface 4 of the rotating body 7. The elastic flexible vanes 63 and 64 and at least one of the two chambers 61 and 62 defined by the pair of elastic flexible vanes 63 and 64, each of the two chambers 61 and 62 in this example, are further divided into two. Similar to chambers 65 and 66 And a pair of resiliently flexible vanes 69 and 70 as another elastic flexible vanes formed integrally with the inner peripheral surface 2 of the housing body 3 as well as divided into the 67 and 68.

  In the elastic flexible vanes 63 and 64 and 69 and 70, the elastic flexible vane 63 and the elastic flexible vane 64, and the elastic flexible vane 69 and the elastic flexible vane 70 have an axis O. In the following, the elastic flexible vane 63 and the elastic flexible vane 69 will be described in detail, and the elastic flexible vane 64 and the elastic flexible vane 70 will be described in detail. The elastic flexible vane 63 and the elastic flexible vane 69 are described and illustrated with the same reference numerals.

  The elastic flexible vane 63 that divides the chamber 66 and the chamber 67 is connected to the outer peripheral surface 4 of the rotating body 7 at one end portion, and has a curved convex surface 71 that is convex in the R2 direction, and a convex surface 71 Correspondingly, one end portion is connected to the outer peripheral surface 4 of the rotating body 7 and extends along the convex surface 71 so as to gradually approach the convex surface 71 from one end portion to the other end portion of the convex surface 71 and terminates with the end of the convex surface 71. And a curved concave surface 72.

  The convex surface 71 has a pair of wedge spaces 73 and 74 facing each other in the R1 and R2 directions which are also the rotation direction R of the relative rotation of the rotating body 7 with respect to the container 3 on the other end side. And an arcuate convex surface 75 having a radius of curvature smaller than the radius of curvature of the inner peripheral surface 2, and the arcuate convex surface 75 of the one wedge space 73 communicating with the chamber 66. The width in the B direction, which is the radial direction, gradually increases in the rotational direction R toward the other wedge space 74 communicating with the other chamber 67 of the two adjacent chambers 66 and 67 with the arcuate convex surface 75 therebetween. The width in the radial direction of the one wedge space 73 is determined such that the width of the other wedge space 74 communicating with the chamber 67 is in the direction of the B in the rotation direction R. Of adjacent two chambers 66 and 67 The width of the other wedge space 74 in the B direction is determined so as to gradually become narrower toward the wedge space 73 communicating with the other chamber 66, and the viscosity passing through the pair of wedge spaces 73 and 74 is determined. The fluid 5 elastically deflects the elastic flexible vane 63 and determines the width of the pair of wedge spaces 73 and 74 in the B direction based on the viscosity thereof.

  An elastic flexible vane 63 having a convex surface 71 and a concave surface 72 and having a thickness that gradually decreases from the outer peripheral surface 4 toward the inner peripheral surface 2 includes a base 76 connected to the rotating body 7 and an arc-shaped convex surface 75. It has the free end part 77 which has, and is integrally formed in circular arc shape.

  The viscous fluid 5 passing through the pair of wedge spaces 73 and 74 passes through the pair of wedge spaces 73 and 74 narrowed from the other chamber 67 to the one chamber 66 in the rotation of the rotating body 7 in the R1 direction with respect to the container 3. The rotating body 7 is defined by the pair of narrowed wedge spaces 73 and 74 and generates a large flow resistance against the rotation in the R1 direction. In the rotation in the R2 direction, it flows through the pair of wedge spaces 73 and 74 expanded from one chamber 66 to the other chamber 67 and is defined by the expanded pair of wedge spaces 73 and 74, and in the R2 direction. A small flow resistance that resists rotation is generated.

  The elastic flexible vane 64 that divides the chamber 65 and the chamber 68 is formed in the same manner as the elastic flexible vane 63, and the viscous fluid 5 that passes through the pair of wedge spaces 73 and 74 in the elastic flexible vane 64. In addition, the elastic flexible vane 64 is elastically bent and the width of the pair of wedge spaces 73 and 74 in the B direction is determined by the viscosity thereof. The viscous fluid 5 passing through the pair of wedge spaces 73 and 74 passes through the pair of wedge spaces 73 and 74 narrowed from the other chamber 65 to the one chamber 68 in the rotation of the rotating body 7 in the R1 direction with respect to the container 3. The rotating body 7 is defined by the pair of narrowed wedge spaces 73 and 74 and generates a large flow resistance against the rotation in the R1 direction. R2 In the direction of rotation, it flows through the pair of wedge spaces 73 and 74 expanded from one chamber 68 to the other chamber 65 and is defined by the expanded pair of wedge spaces 73 and 74 and rotates in the R2 direction. It is designed to generate a small resistance against flow.

  Thus, each of the pair of elastic flexible vanes 63 and 64 is the other in rotation in the R1 direction with respect to the seat portion 11 of the backrest portion 12 from the initial rotation position P0 to the folding rotation position P2 via the predetermined rotation position P1. R1 direction is defined by the narrowed pair of wedge spaces 73 and 74 flowing from the respective chambers 67 and 65 through the narrowed pair of wedge spaces 73 and 74 to the respective one of the chambers 66 and 68. In the R2 direction with respect to the seat portion 11 of the backrest portion 12 from the folding rotation position P2 to the initial rotation position P0 via the predetermined rotation position P1, while generating a flow resistance against the rotation of the viscous fluid 5 In the rotation of the two chambers 67 and 65, respectively, through a pair of wedge spaces 73 and 74 which are expanded to each other. It has a flow resistance against relative rotation of the R2 direction while being defined by the wedge spaces 73 and 74 of the pair so as to generate a viscous fluid 5.

  An elastic flexible vane 69 that divides the chamber 61 into two chambers 65 and 66 adjacent to each other in the rotational direction R in cooperation with the elastic flexible vanes 63 and 64 is complementary to the convex surface 71 of the elastic flexible vane 63. A circular arc-shaped concave surface 81 faces the convex surface 71 of the elastic flexible vane 63 in the rotational direction R, while a cross-sectional V or U-shaped concave surface 82 is formed on the concave surface 72 of the elastic flexible vane 64. A base 83 facing each other in the rotation direction R, and an elastically flexible tongue formed integrally with the base 83 and facing the outer peripheral surface 4 of the rotating body 7 with an arcuate surface 84 Between the outer peripheral surface 4 of the rotating body 7 and the arcuate surface 84 of the tongue 85 having a radius of curvature larger than the radius of curvature of the outer peripheral surface 4. The same wedge space as that of 74 is formed. An elastic flexible vane 69 that forms a wedge space similar to the pair of wedge spaces 73 and 74 on the arcuate surface 84 of the tongue 85 extending integrally in the R2 direction is similar to the elastic flexible vane 63. The relative rotation in the R1 direction of the rotating body 7 with respect to the container 3 allows a large resistance to the flow of the viscous fluid 5 from the chamber 65 to the chamber 66 through the pair of wedge spaces, while the rotating body 7 with respect to the container 3 In the relative rotation in the R2 direction, the flow of the viscous fluid 5 from the chamber 66 to the chamber 65 is allowed with a small resistance.

  An elastic flexible vane 70 that divides the chamber 62 into two chambers 67 and 68 adjacent to each other in the rotation direction R in cooperation with the elastic flexible vanes 63 and 64 is formed in the same manner as the elastic flexible vane 69. The elastic flexible vane 70 that forms a pair of wedge spaces between the outer peripheral surface 4 of the rotating body 7 and the arcuate surface 84 of the tongue 85 is similar to the elastic flexible vane 69 in the R1 direction. In the relative rotation of the rotating body 7 with respect to the container 3, the flow of the viscous fluid 5 from the chamber 67 to the chamber 68 through the pair of wedge spaces is allowed with a large resistance, while the rotating body 7 with respect to the container 3 in the R2 direction. In the relative rotation, the flow of the viscous fluid 5 from the chamber 68 to the chamber 67 is allowed with a small resistance.

  One end face in the A direction of the elastic flexible vanes 63 and 64 is in close contact with the side surface 25 of the flange portion 19 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 32 of the lid body 33 so as to be slidable in the R1 and R2 directions, and the base 83 is integrally formed with the inner peripheral surface 2 of the cylindrical portion 15. The elastic flexible vanes 69 and 70 are formed integrally with the side surface 25 of the flange portion 19 at one end surface in the A direction, and the base 83 is integrally formed with the inner peripheral surface of the protrusion 35. The portions of the elastic flexible vanes 69 and 70 are one end face 88 in the A direction, and the portion A of the elastic flexible vanes 69 and 70 in which the base 83 is integrally formed on the inner peripheral surface 2 of the cylindrical portion 15. The other end face 89 in the direction is in close fluid contact with the other end face 89 in the direction A. It is integrally formed on the side surface 32 of the body main body 33.

  The elastic means 14 has one end 9 disposed in the slit 36 and engaged with the lid body 33 of the container 3, and the other end 13 is inserted into a notch 57 formed in one end 52 of the rotating shaft 51. The coil spring is disposed in the hollow portion 41 so as to be fitted and engaged with the one end portion 52 of the rotating shaft 51 while surrounding the small diameter portion 58 of the rotating shaft 51 between the one end portion 9 and the other end portion 13. 91, and thus the elastic means 14 is disposed in the slit 36 of the housing 3 and is engaged with the housing 3, and the seat 11 and the backrest 12 of the vehicle seat 10. And the other end portion 13 which is engaged with and engaged with the rotating shaft 51 fixed to the backrest portion 12 which is the other side of the backrest portion 12, and the coil spring 91 is formed at one end portion 9 of the container 3 and the rotating body 7. The container 3 is connected to the container 3 which is one of them and is connected to the container 3 at the other end 13. It is linked via a rotary shaft 51 to the rotating body 7 which is the other of the fine rotation body 7.

  When the backrest portion 12 is rotated to the initial rotation position P0, the coil spring 91 is such that one end portion 9 contacts the bottom portion 93 at one end portion 92 of the slit 36 and rotation of the one end portion 9 in the R2 direction is prevented. The torsional elastic force as the maximum elastic rotational force for rotating the backrest portion 12 in the R1 direction is stored, and when the backrest portion 12 is rotated to the predetermined rotational position P1, the backrest portion 12 is moved in the R1 direction. When the backrest 12 is rotated from the predetermined rotation position P1 to the folding rotation position P2, the one end 9 is rotated with the rotation of the backrest 12 and the one end 92 of the slit 36 is not rotated. The other end 94 is guided and moved by the slit 36.

  Thus, when the coil spring 91 rotates in the R1 direction from the initial rotation position P0 to the predetermined rotation position P1 with respect to the seat portion 11 of the backrest portion 12 in the R1 direction, the one end 9 is one end 92 of the slit 36. Viscosity passing through each pair of wedge spaces including a pair of wedge spaces 73 and 74 by applying torsional elastic force stored in contact with the bottom portion 93 of the base to the backrest portion 12 through the other end portion 13 and the rotating shaft 51. While rotating the backrest part 12 in the R1 direction with respect to the seat part 11 against the flow resistance of the fluid 5 and consuming all of the torsional elastic force stored in advance by the rotation of the backrest part 12 to the predetermined rotational position P1, In the rotation in the R1 direction from the predetermined rotation position P1 to the folding rotation position P2 with respect to the seat portion 11 of the backrest 12 in the R1 direction, the one end 9 is at the one end 92 of the slit 36. The application of the elastic rotational force in the R1 direction toward the folding rotation position P2 to the backrest portion 12 is released by moving away from the portion 93 toward the other end portion 94 of the slit 36, and the back of the twisted elastic force is released. In the rotation in the R2 direction toward the initial rotation position P0 from the folding rotation position P2 to the predetermined rotation position P1 from the folding rotation position P2 with respect to the seat portion 11 of the backrest section 12 is not performed. The one end portion 9 is moved away from the other end portion 94 of the slit 36 toward the one end portion 92 of the slit 36 in the R2 direction so that the torsional elastic force is not applied to the backrest 12 and the torsional elastic force is not stored. In the rotation in the R2 direction toward the initial rotation position P0 from the predetermined rotation position P1 to the initial rotation position P0 with respect to the seat portion 11 of the backrest portion 12, the one end portion 9 is At the one end portion 92 of the lit 36, the bottom portion 93 comes into contact and is twisted between the one end portion 9 and the other end portion 13 to store the torsional elastic force and gradually increase to the backrest portion 12 of the elastic rotational force in the R1 direction. Is now starting to grant.

  In the vehicle seat 10 including the seat portion 11 attached to the vehicle body 95 of the automobile and the backrest portion 12 rotatably connected to the seat portion 11, the backrest portion 12 is in the longitudinal direction of the automobile. A predetermined angle α, for example, β = 90 ° with respect to the vertical surface 96 from the initial rotation position P0 tilted backward by a predetermined angle α, for example, α = 25 ° with respect to the vertical surface 96 that is orthogonal and passes through the rotation axis O. It is connected to the seat 11 so as to be rotatable in the directions R1 and R2 about the rotation axis O to a folding rotation position P2 tilted forward. At the initial rotation position P0, R1 and R1 Rotation in the R2 direction is prohibited, and a predetermined rotation that is rotated in the R1 direction by γ = 25 ° + δ (where δ = 10 °) from the initial rotation position P0 when the lock mechanism is unlocked. Up to the position P1, the reduced elastic force in the R1 direction of the torsional elastic force of the coil spring 91 against the flow resistance of the relatively large viscous fluid 5 passing through each pair of wedge spaces including the pair of wedge spaces 73 and 74. From the predetermined rotation position P1 to the folding rotation position P2, the flow of the relatively large viscous fluid 5 passing through each pair of wedge spaces including the pair of wedge spaces 73 and 74 is rotated. While it is designed to rotate in the R1 direction against the resistance due to the weight of the backrest 12 and possibly with the assistance of manual force, from the folding rotation position P2 to the predetermined rotation position P1, it is gradually based on the weight of the backrest 12. It is manually rotated in the R2 direction against the decreasing rotational force in the R1 direction and the flow resistance of the relatively small viscous fluid 5 passing through each pair of wedge spaces 73 and 74 including the pair of wedge spaces 73 and 74. From the predetermined rotational position P1 to the initial rotational position P0, the flow resistance of the relatively small viscous fluid 5 passing through each pair of wedge spaces 73 and 74 including the pair of wedge spaces 73 and 74 and the gradually increasing coil spring 91 The coil spring 91 is manually rotated in the R2 direction against the reduced diameter elastic force in the R1 direction, and the twisted elastic force is stored in the coil spring 91.

  In the above-described vehicle seat rotary damper 1 that functions as a one-way rotary damper, the backrest portion 12 is a coil spring at the rotational position of the rotating body 7 (corresponding to the initial rotational position P0) shown in FIG. The rotating body 7 is rotated with respect to the container 3 so as to expand the chambers 66 and 68 while rotating the chambers 65 and 67 while rotating in the R1 direction with the assistance of the reduced diameter elastic force of 91 torsional elastic force. When rotating in the R1 direction, the pressure of the viscous fluid 5 is applied to the concave surfaces 72 of the elastic flexible vanes 63 and 64 and the concave surfaces 82 of the elastic flexible vanes 69 and 70. The free end 77 side, which is the other end side of the vanes 63 and 64, approaches the inner peripheral surface 2 of the container 3, and the tongue 85 side of the elastic flexible vanes 69 and 70 approaches the outer peripheral surface 4 of the rotating body 7. A pair of wedge spaces 73 and 74 As a result of the elastic flexible vanes 63 and 64 and the elastic flexible vanes 69 and 70 being elastically deformed so as to reduce each pair of wedge spaces, the viscous fluid 5 has a reduced pair of wedge spaces 73 and 74. Each pair of wedge spaces, including the reduced wedge spaces 73 and 74, flows from each of the chambers 65 and 67 to each of the chambers 68 and 66 and each of the chambers 66 and 68. On the other hand, a large braking force due to a relatively large flow resistance of the viscous fluid 5 passing is applied to the rotation of the rotating body 7 in the R1 direction, and the backrest 12 is slowly rotated in the same direction to the folding rotation position P2 via the predetermined rotation position P1. 12, the backrest 12 is manually rotated in the R2 direction at the rotational position of the rotating body 7 shown in FIG. 12 (corresponding to the folding rotational position P2), and the chambers 65 and 67 are enlarged, while the chambers 66 and 68 are reduced. Thus, when the rotating body 7 is rotated in the R2 direction with respect to the container 3, the curved convex surfaces 71 of the elastic flexible vanes 63 and 64 and the concave surfaces 81 of the elastic flexible vanes 69 and 70 are provided. Since the pressure of the viscous fluid 5 is applied, each free end 77 side of the elastic flexible vanes 63 and 64 extends from the inner peripheral surface 2 of the container 3, and the tongue portion 85 of the elastic flexible vanes 69 and 70. The elastic flexible vanes 63 and 64 and the elastic flexible vanes 69 and 70 are elastically deformed so as to widen each pair of wedge spaces including the pair of wedge spaces 73 and 74 away from the outer peripheral surface 4 of the rotating body 7. As a result, the viscous fluid 5 flows through each pair of wedge spaces including a pair of expanded wedge spaces 73 and 74 from each of the chambers 66 and 68 to each of the chambers 67 and 65 and each of the chambers 65 and 67. , Including this pair of widened wedge spaces 73 and 74 Since a small braking by the relatively small flow resistance of the viscous fluid 5 passing through each pair of wedge spaces is given to the rotation of the rotating body 7 in the R2 direction, the backrest 12 is rotated to the initial rotational position P0 by a small manual force. It has become so.

  According to the rotary damper 1, when the backrest portion 12 is rotated from the initial rotation position P 0 to the predetermined rotation position P 1, the backrest portion 12 can be easily rotated with the assistance of the coil spring 91. Is rotated from the predetermined rotation position P1 to the folding rotation position P2, the vane means 8 can generate a large flow resistance in the viscous fluid 5, and as a result, the vane means 8 moves toward the folding rotation position P2 based on the weight of the backrest portion 12. A moderate resistance can be given to the rapid rotation of the backrest portion 12 due to the gradually increasing rotational force, and a collision of the backrest portion 12 at the folding rotation position P2 can be avoided, while the backrest portion 12 is folded manually. When rotating from the rotational position P2 to the initial rotational position P0, the flow resistance of the viscous fluid generated by the vane means 8 is reduced. The results can be made, it can be easily rotated from the rotational position P2 fold the backrest 12 by manually to the initial rotational position P0.

  Further, in the rotary damper 1 functioning as a one-way damper, the viscous fluid 5 whose viscosity decreases as the temperature rises is a pair of wedges including a pair of wedge spaces 73 and 74 when the rotating body 7 rotates in the R1 and R2 directions. For example, when the viscous fluid 5 whose viscosity has increased from the normal temperature at low temperatures passes through the wedge spaces 73 and 74 at low temperatures, the viscous fluid 5 in the wedge spaces 73 and 74 is used. As the pressure increases, the elastic flexible vane 63 is greatly elastically deformed so that the free end 77 side of the elastic flexible vane 63 is further away from the inner peripheral surface 2 of the container 3 than at normal temperature, so that the wedge spaces 73 and 74 are formed. As a result of widening compared with the normal temperature, the flow resistance increases due to the increase in viscosity of the viscous fluid 5 itself and the flow resistance decreases due to the expansion of the wedge spaces 73 and 74. On the other hand, when the viscous fluid 5 whose viscosity is lower than that at normal temperature passes through the wedge spaces 73 and 74 at a high temperature, the elastic flexible vane 63 is freed by the pressure reduction of the viscous fluid in the wedge spaces 73 and 74. As a result of the elastic flexible vane 63 being elastically deformed small and narrowing the wedge spaces 73 and 74 so that the end 77 side is closer to the inner peripheral surface 2 of the container 3 than at normal temperature, the flow due to a decrease in the viscosity of the viscous fluid 5 itself. Due to the decrease in resistance and the increase in flow resistance due to the reduction of the wedge spaces 73 and 74, braking at normal temperature can be maintained despite high temperature, and thus the generated braking has no temperature dependence, and high temperature. However, as a result of being able to obtain braking that does not change even at low temperatures, the backrest portion 12 can be reliably rotated to the folding rotation position P2 by the torsional elastic force of the coil spring 91, and the back can be rotated by a small manual force. Sauce portion 12 can be rotated back to its initial rotational position P0.

  The rotary damper 1 described above has two pairs of elastic flexible vanes 63 and 64, and 69 and 70. However, the rotary damper of the present invention is elastically movable with the pair of elastic flexible vanes 63 and 64. The flexible vane 69 or 70 may be included, and three or more pairs of elastic flexible vanes may be included.

DESCRIPTION OF SYMBOLS 1 Rotary damper 2 Inner peripheral surface 3 Container 4 Outer peripheral surface 6 Space 7 Rotating body 8 Vane means 9 One end part 10 Vehicle seat 11 Seat part 12 Backrest part 13 Other end part 14 Elastic means

Claims (9)

A seat portion of a vehicle seat and a cylindrical inner peripheral surface fixed to one of a backrest portion rotatably connected to the seat portion so as to be rotatable between an initial rotation position and a folding rotation position. The container is accommodated in the container so as to form a space for accommodating the viscous fluid between the container and the cylindrical inner peripheral surface of the container and the cylindrical outer peripheral surface concentric with the inner peripheral surface. A rotating body that is arranged to be relatively rotatable with respect to the body and is fixed to the other one of the seat portion and the backrest portion of the vehicle seat, and a direction from the initial rotation position of the backrest portion to the folding rotation position. Relative rotation in one direction of the rotating body relative to the container causes a large flow resistance to the viscous fluid, and relative rotation in one direction of the rotating body relative to the container in the direction from the folding rotation position of the backrest toward the initial rotation position. In the opposite direction In the relative rotation in the other direction, the viscous fluid between the cylindrical inner peripheral surface of the container and the cylindrical outer peripheral surface of the rotor is stored so as to generate a flow resistance smaller than the flow resistance. The vane means arranged in the space and one end connected to one of the seat and backrest of the vehicle seat, and the other end connected to the other of the seat and backrest of the vehicle seat 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 predetermined rotation position between the initial rotation position and the folding rotation position toward the folding rotation position at the backrest portion of which comprises an elastic means for imparting an elastic rotational force, the elastic means, the rotation from the initial rotational position in the direction toward the folded rotational position to a predetermined rotational position relative to the seat portion of the backrest, folding rotational position An elastic rotational force in the direction toward the back is applied to the backrest to rotate the backrest against the seat against the flow resistance of the viscous fluid, while the predetermined rotational position and the folding rotational position A rotary damper for a vehicle seat configured to cancel application of elastic rotational force in a direction toward a folding rotation position to the backrest portion at a rotation position of the backrest portion with respect to the seat portion . A seat portion of a vehicle seat and a cylindrical inner peripheral surface fixed to one of a backrest portion rotatably connected to the seat portion so as to be rotatable between an initial rotation position and a folding rotation position. The container is accommodated in the container so as to form a space for accommodating the viscous fluid between the container and the cylindrical inner peripheral surface of the container and the cylindrical outer peripheral surface concentric with the inner peripheral surface. A rotating body that is arranged to be relatively rotatable with respect to the body and is fixed to the other one of the seat portion and the backrest portion of the vehicle seat, and a direction from the initial rotation position of the backrest portion to the folding rotation position. Relative rotation in one direction of the rotating body relative to the container causes a large flow resistance to the viscous fluid, and relative rotation in one direction of the rotating body relative to the container in the direction from the folding rotation position of the backrest toward the initial rotation position. In the opposite direction In the relative rotation in the other direction, the viscous fluid between the cylindrical inner peripheral surface of the container and the cylindrical outer peripheral surface of the rotor is stored so as to generate a flow resistance smaller than the flow resistance. The vane means arranged in the space and one end connected to one of the seat and backrest of the vehicle seat, and the other end connected to the other of the seat and backrest of the vehicle seat The direction from the initial rotation position relative to the seat portion of the backrest portion around the rotation axis of the rotating body relative to the container to the predetermined rotation position between the initial rotation position and the folding rotation position toward the folding rotation position on the backrest portion Elastic means for applying an elastic rotational force, and the vane means has a space for accommodating the viscous fluid between the cylindrical inner peripheral surface of the container and the cylindrical outer peripheral surface of the rotor. It is divided into two chambers and the rotating body A pair of elastic flexible vanes integrally formed on the peripheral surface and at least one of the two chambers partitioned by the pair of elastic flexible vanes are further divided into two chambers and And another elastic flexible vane integrally formed on the inner peripheral surface. Each of the pair of elastic flexible vanes is connected to the outer peripheral surface of the rotating body at one end and to the container. A curved convex surface convex in the opposite direction to the relative rotation in one direction of the rotating body, and at one end corresponding to the convex surface, is connected to the outer peripheral surface of the rotating body and extends along the convex surface. The convex surface has 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 on the other end side and between the inner peripheral surface of the container. The arc-shaped convex surface formed by In the rotational direction of the relative rotation of the rotating body, the radial width of one wedge space communicating with one of the two adjacent chambers with the arcuate convex surface therebetween is relative to the container. The radial direction of the one wedge space so that it gradually becomes narrower toward the other wedge space communicating with the other of the two adjacent chambers with the arcuate convex surface in the rotation direction of rotation. And the radial direction of the other wedge space communicating with the other of the two adjacent chambers with the arcuate convex surface in the rotational direction of the relative rotation of the rotating body with respect to the container. The width is gradually reduced toward one wedge space communicating with one of two adjacent chambers with the arcuate convex surface in the rotation direction of the relative rotation of the rotating body with respect to the container. In the radial direction of the other wedge space The viscous fluid that passes 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 according to the viscosity. Each of the pair of elastic flexible vanes is a pair of narrowed one chamber from the other chamber in rotation with respect to the seat portion of the backrest portion from the initial rotation position to the folding rotation position via the predetermined rotation position. The viscous fluid is adapted to generate a flow resistance that is defined by the pair of narrowed wedge spaces flowing through the wedge space and resists the rotation, while the predetermined rotation position is changed from the folding rotation position. The rotation of the backrest to the initial rotation position through the pair of wedge spaces that are expanded from one chamber to the other chamber and defined by the expanded pair of wedge spaces. Rotary damper for a vehicle seat that the flow resistance against with respect to the rotation adapted to generate the viscous fluid. In the rotation in the direction toward the folding rotation position from the initial rotation position to the predetermined rotation position with respect to the seat portion of the backrest portion, the elastic means applies an elastic rotational force in the direction toward the folding rotation position to the backrest portion to thereby apply the viscous fluid. While the backrest is rotated with respect to the seat against the flow resistance, in the rotation position relative to the seat of the backrest between the predetermined rotation position and the folding rotation position, the direction toward the folding rotation position The rotary damper for a vehicle seat according to claim 2, wherein the application of the elastic rotational force to the backrest portion is released. The rotary damper for a vehicle seat according to claim 2 or 3, 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 any one of claims 2 to 4, wherein the arc-shaped convex surface has a curvature radius smaller than a curvature radius of the cylindrical inner peripheral surface of the container. Another elastic flexible vane has a base portion formed integrally with the inner peripheral surface of the container, and an arcuate surface formed integrally with the base portion and facing the outer peripheral surface of the rotating body. The rotary damper for a vehicle seat according to any one of claims 2 to 5, further comprising an elastically flexible tongue. The container has a slit or a recess extending over a range corresponding to a predetermined rotation position with respect to the seat portion of the backrest portion with respect to the rotation axis center of the rotating body with respect to the container 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 one of the seat portion and the backrest portion of the vehicle seat, and the elastic means is arranged in a slit or a recess of the housing body. 7. The vehicle seat according to claim 1, further comprising: an end portion that engages with the housing body, and an other end portion that engages with and engages with the rotation shaft of the rotating body. Rotary damper. 2. The elastic means includes a coil spring 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 1 to 7.   The rotary damper for a vehicle seat according to any one of claims 1 to 8, wherein the elastic means is disposed coaxially with the rotating body in the hollow portion of the rotating body.

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