JP5650042B2 - Rotary damper - Google Patents

Description

  The present invention relates to a rotary damper, and more particularly to a structure of a rotary damper suitable for generating a strong braking torque.

  A so-called unidirectional rotary damper is known in which a strong braking torque is generated with respect to rotation in the forward direction, while a weak braking torque is generated with respect to rotation in the reverse direction. For example, Patent Document 1 discloses a unidirectional rotary damper that has a simple structure and can be manufactured at low cost.

  The rotary damper disclosed in Patent Document 1 is a cylindrical shape that is housed in a cylindrical chamber so that the case having a cylindrical chamber with an open upper surface and a rotation shaft that can rotate freely in alignment with the center line of the cylindrical chamber. And a rotor (rotary body) having a rotor body and a vane, a viscous fluid filled in the cylindrical chamber, and a lid for sealing the rotor together with the viscous fluid in the cylindrical chamber. A convex partition is formed on the inner wall surface of the cylindrical chamber along the center line so as to form a slight gap with the outer peripheral surface of the rotor body. The vane is formed to protrude from the outer peripheral surface of the rotor body toward the inner wall surface side of the cylindrical chamber so as to form a slight gap with the inner wall surface of the cylindrical chamber. The vane is formed with a flow path connecting from one side surface (referred to as a first side surface) perpendicular to the rotation direction of the rotor to the other side surface (referred to as a second side surface). In addition, a seal member that fills a gap between the vane and the inner wall surface of the cylindrical chamber is attached to the tip surface of the vane (a surface facing the inner wall surface of the cylindrical chamber). The seal member includes an elastic check valve that opens and closes the flow path from the second side surface in the vane rotation direction.

  In the configuration as described above, the rotary damper disclosed in Patent Document 1 is configured such that when a force that rotates the vane in the direction from the first side surface to the second side surface (forward rotation direction) is applied to the rotor, the viscosity in the cylindrical chamber is increased. The check valve is pressed against the second side surface of the vane by the fluid, and the flow path is blocked by the check valve. Thereby, the movement of the viscous fluid is limited only through a slight gap between the partition of the cylindrical chamber and the outer peripheral surface of the rotor body, and the pressure on the viscous fluid on the second side surface side of the vane is increased. Strong braking torque is generated. On the other hand, when a force is applied to the rotor in the direction from the second side surface of the vane toward the first side surface (reverse rotation direction), the viscous fluid on the first side surface side of the vane flows into the flow path to check. Push up the valve to open the flow path. Therefore, since the viscous fluid moves also in the flow path formed in the vane, the pressure on the viscous fluid on the first side surface side of the vane does not increase, and thus a weak braking torque is generated.

Japanese Patent Laid-Open No. 7-301272

  As described above, the rotary damper has a structure in which various parts such as a case, a rotor including a vane, and a lid for sealing the rotor together with the viscous fluid are assembled. A braking force is obtained by rotating the rotor in a case filled with a viscous material while being in sliding contact with the rotor. For this reason, in the rotary damper, the radial direction between the outer peripheral surface of the vane and the inner peripheral surface of the case, and the upper surface of the vane due to an assembly error of each component, wear caused by sliding contact with the inner surface of the vane case and the rear surface of the lid, etc. Undesirable gaps may occur in the axial direction between the bottom surface of the lid and the back surface of the lid and between the bottom surface of the vane and the bottom surface of the case. Therefore, in order to obtain a desired strong braking force, it is necessary to eliminate these undesirable gaps as much as possible to form a sealed space.

However, like the rotary damper described in Patent Document 1, it is possible to eliminate the radial gap between the vane outer peripheral surface and the case inner peripheral surface to some extent by using a seal member. It is difficult to eliminate the axial gap between the back surface of the lid and between the lower surface of the vane and the bottom surface of the case. For this reason, there is a possibility that a desired strong braking torque may not be obtained due to the axial clearance. An object of the present invention is to provide a technique capable of generating a stronger braking torque against a rotational force.

  In order to solve the above-described problems, the present invention provides a rotary damper that generates a braking torque with respect to an applied rotational force by restricting the movement of the filled viscous fluid. As the fluid pressure increases, a means for improving the barrier between the partition of the cylindrical chamber and the region partitioned by the vanes of the rotor is provided.

For example, the present invention is a rotary damper that generates a braking torque with respect to an applied rotational force by limiting movement of a filled viscous fluid,
A case comprising a cylindrical chamber having an upper surface opened and filled with the viscous fluid;
A movable plate housed in the cylindrical chamber and arranged to be movable in the direction of the center line of the cylindrical chamber;
A rotor housed in the cylindrical chamber so as to rotate relative to the case around a center line of the cylindrical chamber by the rotational force;
A lid attached to the upper surface side of the cylindrical chamber, for confining the rotor and the movable plate together with the viscous fluid in the cylindrical chamber;
On the inner wall surface of the cylindrical chamber,
A convex partition is formed in which the front end surface is close to the outer peripheral surface of the rotor,
On the outer peripheral surface of the rotor,
A vane whose tip surface is close to the inner wall surface of the cylindrical chamber is formed,
The movable plate is
Of the regions that are arranged between the lid and the vane or between the bottom surface of the cylindrical chamber and the vane so as to block the region that is partitioned by the partition, the region is divided by the partition and the vane. In contrast, when the rotor is rotated relatively in the first rotation direction, a first through hole is formed on the region side where the viscous fluid is pressurized in the region,
The viscous fluid is
When the rotor is rotated relative to the case in the first rotation direction, the region separated by the movable plate and the lower surface of the lid through the first through hole, or the The movable plate moves to a pressure adjusting region, which is a region divided by the movable plate and the bottom surface of the cylindrical chamber, and presses the movable plate against the vane.

  According to the present invention, in the rotary damper, as the rotational force increases and the pressure of the viscous fluid increases, the shielding between the regions partitioned by the partition of the cylindrical chamber and the vane of the rotor is improved. In contrast, a stronger braking torque can be generated.

FIG. 1A and FIG. 1B are an external view and a partial sectional view showing a schematic configuration of a rotary damper 1 according to the first embodiment of the present invention. FIG. 2 is a component development view of the rotary damper 1. 3A to 3C are a top view, a front view, and a bottom view of the case 11, and FIG. 3D is a cross-sectional view taken along line AA of the case 11 shown in FIG. It is. 4A to 4C are a top view, a front view, and a bottom view of the lid 14, respectively. 5 (A) to 5 (C) are a top view, a front view, and a side view of the rotor 12, and FIG. 5 (D) is a BB cross-sectional view of the rotor 12 shown in FIG. 5 (B). FIG. 5E is an enlarged view of a portion A in FIG. 6A and 6B are a top view and a front view of the movable plates 15a and 15b, respectively, and FIG. 6C is a cross-sectional view taken along the line C-C shown in FIG. 6A. FIG. 7A to FIG. 7C are diagrams for explaining the operating principle of the rotary damper 1 according to the first embodiment of the present invention. FIG. 8A to FIG. 8C are diagrams for explaining the operating principle of the rotary damper 1 according to the first embodiment of the present invention. FIG. 9A and FIG. 9B are an external view and a partial cross-sectional view showing a schematic configuration of the rotary damper 2 according to the second embodiment of the present invention. FIG. 10 is a component development view of the rotary damper 2. 11A and 11B are a top view and a front view of the movable plates 25a and 25b, and FIGS. 11C and 11D are DD views shown in FIG. 11A. 11E is an enlarged view of a portion B in FIG. 11D, and FIG. 11F is a cross-sectional view taken along the line FF in FIG. 11E. is there. 12 (A) to 12 (C) are views for explaining the operating principle of the rotary damper 2 according to the second embodiment of the present invention. FIG. 13 (A) to FIG. 13 (C) are diagrams for explaining the operating principle of the rotary damper 2 according to the second embodiment of the present invention. 14A and 14B are a top view and a front view of the movable plates 35a and 35b, respectively, and FIGS. 14C and 14D are GG shown in FIG. 14A. FIG. 14E is an enlarged view of a portion C in FIG. 14C, and FIG. 14F is an enlarged view of a portion D in FIG. 14D. It is. FIGS. 15A to 15D are views for explaining the operating principle of the rotary damper 3 according to the third embodiment of the present invention. FIGS. 16A to 15D are views for explaining the operating principle of the rotary damper 3 according to the third embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings.

<First embodiment>
FIG. 1A and FIG. 1B are an external view and a partial cross-sectional view showing a schematic configuration of the rotary damper 1 according to the first embodiment of the present invention, and FIG. 2 is a component development of the rotary damper 1. FIG.

  As illustrated, the rotary damper 1 according to the present embodiment is filled in a case 11, a rotor (rotary body) 12 accommodated in the case 11 so as to be rotatable relative to the case 11, and the case 11. The viscous fluid (oil, silicon, etc.) 13, a pair of movable plates 15 a and 15 b that can move in a direction parallel to the rotating shaft 120 of the rotor 12, and the rotor 12 and the movable plates 15 a and 15 b together with the viscous fluid 13 and the case 11 It has a lid 14 that is sealed inside, and a plurality of screws 18 for fixing the lid 14 to the case 11. Although not shown in FIGS. 1 and 2, the rotary damper 1 further includes a check valve 16.

  3A to 3C are a top view, a front view, and a bottom view of the case 11, and FIG. 3D is a cross-sectional view taken along line AA of the case 11 shown in FIG. 3A. .

  As illustrated, the case 11 includes a case main body 112 and a flange portion 118 formed on the outer periphery of the edge portion of the upper surface 119 of the case main body 112.

  A cylindrical chamber (cylindrical space having a disk-shaped bottom surface 116 with an upper surface 119 opened) 111 is formed in the case main body 112. The rotor 12 includes a cylindrical rotor main body 131 and a pair of vanes 124a and 124b formed on the outer peripheral surface 122 of the rotor main body 131, and rotates around the center line 110 of the cylindrical chamber 111 (the cylindrical chamber 111). ) So that the center line 110 of the rotor becomes the rotation shaft 120 of the rotor 12). The inner peripheral surface (side wall surface of the cylindrical chamber 111) 113 of the case main body 112 has an outer periphery of the rotor main body 131 so that an annular space between the outer peripheral surface 122 of the rotor main body 131 and the side wall surface 113 is partitioned in the radial direction. A pair of convex partitions 115 a and 115 b protruding toward the surface 122 (a pair of convex partitions in which the front end surface 114 is close to the outer peripheral surface 122 of the rotor main body 131) along the center line 110 of the cylindrical chamber 111. The cylindrical chamber 111 is formed from the bottom surface 116 to the top surface 119. The viscous fluid 13 is filled in regions (111a to 111d in FIG. 7) between the outer peripheral surface 122 of the rotor body 131 and the side wall surface 113 of the cylindrical chamber 111, which are partitioned by these partitions 115a and 115b. In addition, an opening 117 for inserting one end (lower end) 129 a of the rotor body 131 is formed on the bottom surface 116 of the cylindrical chamber 111.

  A plurality of screw holes 118a are formed in the flange portion 118, and the screws 18 inserted into the through holes 143a of the lid 14 placed on the flange portion 118 are fastened to these screw holes 118a.

  4A to 4C are a top view, a front view, and a bottom view of the lid 14, respectively.

  As illustrated, the lid 14 is formed with an opening 141 for inserting the upper end portion 129 b of the rotor body 131 at a position facing the opening 117 of the bottom surface 116 of the cylindrical chamber 111. Further, through holes 143a for inserting the screws 18 fastened to the screw holes 118a are formed at positions corresponding to the screw holes 118a of the flange portion 118 of the case 11. In order to prevent the viscous fluid 13 in the cylindrical chamber 111 from leaking to the outside, a sealing material such as an O-ring may be interposed between the lid 14 and the case 11 to improve the sealing performance.

  5 (A) to 5 (C) are a top view, a front view, and a side view of the rotor 12, and FIG. 5 (D) is a BB cross-sectional view of the rotor 12 shown in FIG. 5 (B). 5 (E) is an enlarged view of a portion A in FIG. 5 (D).

  As shown in the drawing, a through hole 121 for inserting a shaft (not shown) for transmitting a rotational force from the outside to the rotor 12 is formed in the rotor body 131 around the rotation shaft 120 of the rotor 12. Yes. The lower end portion 129a of the rotor body 131 (through hole 121) is slidably inserted into the opening 117 formed in the bottom surface 116 of the cylindrical chamber 111 of the case 11, and the upper end of the rotor body 131 (through hole 121). The part 129 b is slidably inserted into the opening 141 of the lid 14. In order to prevent the viscous fluid 13 from leaking from the cylindrical chamber 111, sealing materials such as O-rings are used as the end portions 129 a and 129 b of the rotor body 131, the opening portion 117 of the case 11, and the opening portion 141 of the lid 14. It is also possible to improve sealing performance by interposing them between the two.

  The outer peripheral surface 122 of the rotor body 131 is directed toward the side wall surface 113 of the cylindrical chamber 111 such that a front end surface (a surface facing the side wall surface 113 of the cylindrical chamber 111) 123 is close to the side wall surface 113 of the cylindrical chamber 111. A pair of protruding vanes (rotary blades) 124 a and 124 b are formed along the rotating shaft 120 of the rotor 12. The vanes 124 a and 124 b are formed when the rotor 12 is accommodated in the cylindrical chamber 111 such that the lower surfaces (surfaces facing the bottom surface 116 of the cylindrical chamber 111) 125 of the vanes 124 a and 124 b come into contact with the bottom surface 116 of the cylindrical chamber 111. At least the thickness t of the movable plates 15a and 15b between the upper surfaces 124a and 125b (the surface on the lid 14 side) 126 and the upper surface 119 of the cylindrical chamber 111 (see the thickness t of the movable plates 15a and 15b shown in FIG. 6). It is formed so that there is a gap between.

  The vanes 124a and 124b include vanes 124a and 124b between the front end surface 123 and the side wall surface 113 of the cylindrical chamber 111, between the lower surface 125 of the vanes 124a and 124b and the bottom surface 116 of the cylindrical chamber 111, and the vanes 124a, A lip seal (see FIG. 2) 127 for closing a gap formed between the upper surface 126 of 124b and the back surface (surface on the case 11 side) 142 of the lid 14 is attached.

  One vane 124 a includes a region 111 a (see FIG. 7) in the cylindrical chamber 111 defined by the vane 124 a and the partition 115 a of the cylindrical chamber 111, and a cylindrical chamber 111 partitioned by the vane 124 a and the partition 115 b of the cylindrical chamber 111. A flow path (orifice) 128a connecting the inner region 111b (see FIG. 7) is formed so as to penetrate the one side surface 132a and the other side surface 133a of the vane 124a. Similarly, the other vane 124b includes a region 111c (see FIG. 7) in the cylindrical chamber 111 partitioned by the vane 124b and the partition 115a of the cylindrical chamber 111, and a cylinder partitioned by the vane 124b and the partition 115b of the cylindrical chamber 111. A flow path 128b connecting the region 111d (see FIG. 7) in the chamber 111 is formed so as to penetrate the one side surface 132b and the other side surface 133b of the vane 124b.

  A spherical check valve 16 is provided in each of the flow paths 128a and 128b.

  The flow paths 128a and 128b are formed on the columnar first flow path section 1281 formed on the side surfaces 132a and 132b of the vanes 124a and 124b, and on the other side surfaces 133a and 133b of the vanes 124a and 124b. And a cylindrical second flow path section 1282 having a larger radial cross-sectional area than the first flow path section 1281. The first flow path section 1281 is filled when the rotating body 12 is rotated in the forward rotation direction (α direction in the present embodiment, see FIG. 7) with respect to the second flow path section 1282. The viscous fluid 13 is formed so as to be adjacent to the regions 111b and 111c (see FIG. 7) to be decompressed. A boundary 1284 between the first flow path section 1281 and the second flow path section 1282 is tapered. The second flow path section 1282 has a diameter larger than the spherical diameter of the check valve 16, and the check valve 16 that opens and closes the first flow path section 1281 is slid in the flow direction of the viscous fluid 13. Store freely. Further, a stopper 1283 for restricting the slide range of the check valve 16 is provided in the second flow path section 1282 and in the vicinity of the end face on the opposite side of the first flow path section 1281 with respect to the check valve 16. (Positions 111a and 111d side where the filled viscous fluid 13 is pressurized with respect to the check valve 16).

  6A and 6B are a top view and a front view of the movable plates 15a and 15b, respectively, and FIG. 6C is a cross-sectional view taken along the line C-C shown in FIG. 6A.

  As shown in the drawing, one movable plate 15a has a region 111e in the cylindrical chamber 111 (see FIG. 11) separated by one radial side surface 132a of the partition 115a of the cylindrical chamber 111 and the other radial side surface 133b of the partition 115b. 7), and is disposed between the back surface 142 of the lid 14 and the top surface 126 of the vane 124a of the rotor 12 so as to close the region 111e (see FIGS. 1 and 2). . Similarly, the other movable plate 15b is a region 111f in the cylindrical chamber 111 that is partitioned by the other radial side surface 132b of the partition 115a of the cylindrical chamber 111 and one radial side surface 133a of the partition 115b (see FIG. 7). ) And is arranged between the back surface 142 of the lid 14 and the upper surface 126 of the vane 124b of the rotor 12 so as to close the region 111f (see FIGS. 1 and 2).

  Further, even when the movable plates 15a and 15b move to a position where they contact the back surface 142 of the lid 14, a gap (upper surface (surface on the lid 14 side) 154 of the movable plates 15a and 15b and the back surface 142 of the lid 14 ( The movable plates 15a and 15b are formed on the base member 150 made of a fan-shaped flat plate member and the entire outer peripheral portion on the upper surface 154 side of the base member 150 so that the pressure adjusting regions 111g and 111h are formed. And a concave region (upper surface region) 155 surrounded by the edge 151. The edge 151 is formed so as to protrude upward. A thickness t from the lower surface 153 of the base member 150 to the upper surface 156 of the edge portion 151 is larger than the thickness t1 of the base member 150. Note that the movable plate 15a, 15b, and the movable plate 15a, 15b, so that the viscous fluid 13 does not move from the gap between the edge 151 of the movable plate 15a, 15b, the side wall surface 113 of the cylindrical chamber 111, the partitions 115a, 115b, and the outer peripheral surface 122 of the rotor 12. A lip seal or the like may be attached to the edge 151 of 15b to improve the sealing performance.

  Further, in the upper surface region 155 of the movable plates 15a and 15b, a region 111a to which the viscous fluid 13 is pressurized when the rotor 12 is rotated in the forward rotation direction (α direction in the present embodiment, see FIG. 7), A first through hole 152 is formed in the vicinity of the edge 151 on the 111d (see FIG. 7) side.

  Next, the operation principle of the rotary damper 1 will be described. FIGS. 7A to 7C and FIGS. 8A to 8C are diagrams for explaining the operation principle of the rotary damper 1.

  As shown in FIG. 7A, when the rotor 12 rotates relative to the case 11 in the normal rotation direction (α direction in the present embodiment), as shown in FIG. 13, the check valve 16 slides in the second flow path section 1282 to the boundary 1284 between the first flow path section 1281 and the second flow path section 1282, and the first flow path section Block 1281. Thereby, the flow paths 128a and 128b are closed.

  As a result, as shown in FIG. 7C, in the cylindrical chamber 111, the region 111a and the region 111b, and the region 111d and the region 111c separated by the partitions 115a and 115b and the vanes 124a and 124b of the rotor 12 The movement of the viscous fluid 13 through the flow paths 128a and 128b is limited. Thereby, the pressure of the viscous fluid 13 in the area | regions 111a and 111d of the pressurized side increases.

  Further, as shown in FIG. 7C, the viscous fluid 13 from the pressurized region 111a passes through the first through hole 152 of the movable plate 15a and the upper surface region 155 of the movable plate 15a and the lid 14 It flows into the pressure regulating region 111g formed between the back surface 142 and the back surface 142. Therefore, the area of the movable plate 15a on the upper surface 154 side of the base member 150 that receives the pressure of the pressurized viscous fluid 13 is larger than that of the lower surface 153 side of the base member 150 of the movable plate 15a. The pressure in the pressure regulating region 111g on the upper surface 154 side of the base member 150 of 15a is higher than the pressure on the lower surface 153 side of the base member 150 of the movable plate 15a. Thereby, the movable plate 15a is pressed against the upper surface 126 of the vane 124a, and the adhesion between the upper surface 126 of the vane 124a and the lower surface 153 of the base member 150 of the movable plate 15a is improved.

  Similarly, from the pressurized region 111d, the viscous fluid 13 is formed between the upper surface region 155 of the movable plate 15b and the back surface 142 of the lid 14 through the first through hole 152 of the movable plate 15b. Flow into the pressure regulating region 111h. Therefore, the area of the movable plate 15b on the upper surface 154 side of the base member 150 that receives the pressure of the pressurized viscous fluid 13 is larger than that of the lower surface 153 side of the base member 150 of the movable plate 15b. The pressure in the pressure adjusting region 111h on the upper surface 154 side of the base member 150 of 15b is higher than the pressure on the lower surface 153 side of the base member 150 of the movable plate 15b. Thereby, the movable plate 15b is pressed against the upper surface 126 of the vane 124b, and the adhesion between the upper surface 126 of the vane 124b and the lower surface 153 of the base member 150 of the movable plate 15b is improved.

  Therefore, in the cylindrical chamber 111, the barrier property between the region 111a and the region 11b and the region 111d and the region 111c separated by the partitions 115a and 115b and the vanes 124a and 124b of the rotor 12 is further improved. The movement of the viscous fluid 13 from the regions 111a and 111d on the pressurized side to the regions 111b and 111c on the decompressed side is further restricted, and the pressure of the viscous fluid 13 in the regions 111a and 111d on the pressurized side Increases and a stronger braking torque is generated.

  On the other hand, as shown in FIG. 8 (A), when the rotor 12a rotates relative to the case 11 in the reverse rotation direction (β direction in the present embodiment), as shown in FIG. The check valve 16 moves away from the boundary 1284 between the first flow path section 1281 and the second flow path section 1282 by the pressure of the fluid 13 and slides in the second flow path section 1282 until it abuts against the stopper 1283. To do. Thereby, the flow paths 128a and 128b are opened. As a result, as shown in FIG. 8C, the viscous fluid 13 is separated from the region 111a and the region separated by the partitions 115a and 115b of the cylindrical chamber 111 and the vanes 124a and 124b of the rotor 12 through the flow paths 128a and 128b. It moves freely between 111b and between the area | region 111d and the area | region 111c.

  As a result, a weak braking torque is generated without increasing the pressure of the viscous fluid 13 in the pressurized regions 111b and 111c.

  The first embodiment of the present invention has been described above.

  In the present embodiment, in the rotary damper 1 that generates a braking torque with respect to the applied rotational force by limiting the movement of the viscous fluid 13 filled in the cylindrical chamber 111 via the flow paths 128a and 128b. As the rotational force increases and the pressure of the viscous fluid 13 increases, the partition 115a and 115b of the cylindrical chamber 111 and the region 111b separated by the vane 124a of the rotor 12 and the partition 115a of the cylindrical chamber 111 are separated. , 115b and the vane 124b of the rotor 12 to further improve the shielding property between the region 111d and the region 111c.

  Specifically, the movable plate 15a is placed on the back surface 142 of the lid 14 so as to block the region 111e defined by one radial side surface 132a of the partition 115a of the cylindrical chamber 111 and the other radial side surface 133b of the partition 115b. And the upper surface 126 of the vane 124a of the rotor 12 so as to block the region 111f defined by the other radial side surface 132b of the partition 115a of the cylindrical chamber 111 and the one radial side surface 133a of the partition 115b. Further, the movable plate 15 b is disposed between the back surface 142 of the lid 14 and the upper surface 126 of the vane 124 b of the rotor 12. Here, the viscous fluid 13 is applied to the movable plates 15a and 15b when the rotor 12 is rotated in the forward rotation direction among the regions 111a to 111d divided by the partitions 115a and 115b and the vanes 124a and 124b of the rotor 12. A first through hole 152 connected to the pressed regions 111a and 111d is formed. Therefore, when the rotor 12 is rotated in the forward rotation direction, the viscous fluid 13 is regulated by the upper surface region 155 of the movable plates 15 a and 15 b and the rear surface 142 of the lid 14 through the first through hole 152. It moves to the pressure regions 111g and 111h. As a result, the area of the movable plate 15a, 15b on the upper surface 154 side of the base member 150 is larger than the area of the movable plate 15a, 15b on the lower surface 153 side of the base member 150 that receives the pressure of the pressurized viscous fluid 13. Thus, the pressure in the pressure regulating regions 111g and 111f on the upper surface 154 side of the base member 150 of the movable plates 15a and 15b becomes higher than the pressure on the lower surface 153 side of the base member 150 of the movable plates 15a and 15b. Therefore, the movable plates 15a and 15b are pressed against the upper surfaces 126 of the vanes 124a and 124b of the rotor 12, and the adhesion between the upper surfaces 126 of the vanes 124a and 124b of the rotor 12 and the upper surface 154 of the base member 150 of the movable plates 15a and 15b is improved. improves.

  For this reason, according to the present embodiment, as the rotational force increases and the pressure of the viscous fluid 13 increases, the region 111a and the region 111b separated by the partitions 115a and 115b of the cylindrical chamber 111 and the vane 124a of the rotor 12 are separated. And the shielding property between the region 111d and the region 111c partitioned by the partitions 115a and 115b of the cylindrical chamber 111 and the vane 124b of the rotor 12 can be further improved. A stronger braking torque can be generated.

  Further, in the present embodiment, the vanes 124a and 124b of the rotor 12 are arranged between the regions 111a and 111d and the regions 111d and 111d separated by the partitions 115a and 115b of the cylindrical chamber 111 and the vanes 124a and 124b of the rotor 12. The flow paths 128a and 128b are formed between the rotor 12 and the rotor 12c. The flow paths 128a and 128b are closed with respect to the rotation of the rotor 12 in the forward rotation direction. A check valve 16 that opens the flow paths 128a and 128b with respect to rotation in the reverse direction is provided.

  For this reason, according to the present embodiment, only when a rotational force for rotating the rotor 12 relative to the case 11 in the normal rotation direction is applied, a strong braking torque can be generated. The rotary damper 1 can be realized.

  In the present embodiment, the movable plates 15a and 15b are disposed between the back surface 142 of the lid 14 and the top surfaces 126 of the vanes 124a and 124b of the rotor 12, but the present invention is not limited to this. The movable plates 15 a and 15 b may be disposed between the bottom surface 116 of the cylindrical chamber 111 and the lower surface 125 of the vanes 124 a and 124 b of the rotor 12. Or you may make it arrange | position between both the back surface 142 of the lid | cover 14, and the upper surface 126 of the vanes 124a and 124b of the rotor 12, and between the bottom surface 116 of the cylindrical chamber 111, and the lower surface 125 of the vanes 124a and 124b. .

  In the present embodiment, the flow paths 128a and 128b are formed in the vanes 124a and 124b of the rotor 12, and the check valve 16 is provided in the flow paths 128a and 128b. However, the present invention is not limited to this. . The flow paths 128a and 128b may be formed in the partitions 115a and 115b of the cylindrical chamber 111 of the case 11, and the check valve 16 may be provided in the flow paths 128a and 128b.

  In the present embodiment, the flow paths 128a and 128b and the check valve 16 provided in the flow paths 128a and 128b may be omitted. In this case, when the rotor 12 rotates in the reverse rotation direction (β direction), the viscous fluid 13 in the pressurized regions 111b and 111c pushes up the movable plates 15a and 15b, and lower surfaces 153 of the movable plates 15a and 15b. A gap is formed between the upper surface 126 of the rotor 12 and the vanes 124a and 124b of the rotor 12, and the region moves to the regions 111a and 111d on the decompressed side through the gap. As a result, a weak braking torque is generated without increasing the pressure of the viscous fluid 13 in the pressurized regions 111b and 111c.

<Second embodiment>
FIG. 9A and FIG. 9B are an external view and a partial cross-sectional view showing a schematic configuration of the rotary damper 2 according to the second embodiment of the present invention, and FIG. 10 is a development of parts of the rotary damper 2. FIG.

  As illustrated, the rotary damper 2 according to the present embodiment fills a case 11, a rotor (rotary body) 12 a housed in the case 11 so as to be rotatable relative to the case 11, and a cylindrical chamber 111. And a pair of movable plates 25a and 25b movable in a direction parallel to the rotating shaft 120 of the rotor 12, and a lid for enclosing the rotor 12a and the movable plates 25a and 25b together with the viscous fluid 13 in the cylindrical chamber 111. 14 and a plurality of screws 18 for fixing the lid 14 to the case 11. Although not shown in FIGS. 9 and 10, the rotary damper 2 further includes a check valve 26.

  Here, the case 11, the viscous fluid 13, the lid 14, and the screw 18 are the same as those used in the rotary damper 1 according to the first embodiment. The rotor 12a is the same as the rotor 12 used in the rotary damper 1 according to the first embodiment except that the flow paths 128a and 128b are not formed in the vanes 124a and 124b. Therefore, in the following, description of these will be omitted.

  11A and 11B are a top view and a front view of the movable plates 25a and 25b, and FIGS. 11C and 11D are DD cross-sectional views shown in FIG. 11A. 11E is an enlarged view of a portion B in FIG. 11D, and FIG. 11F is an FF sectional view of FIG. 11E.

  As shown in the figure, one movable plate 25a has a region 111e in the cylindrical chamber 111 separated by one radial side surface 132a of the partition 115a of the cylindrical chamber 111 and the other radial side surface 133b of the partition 115b (see FIG. 12), and is disposed between the back surface 142 of the lid 14 and the upper surface (surface on the lid 14 side) 126 of the vane 124a of the rotor 12a so as to close the region 111e (see FIG. 12). FIG. 9 and FIG. 10). Similarly, the other movable plate 25b is a region 111f in the cylindrical chamber 111 that is partitioned by the other radial side surface 132b of the partition 115a of the cylindrical chamber 111 and one radial side surface 133a of the partition 115b (see FIG. 12). ) And is disposed between the back surface 142 of the lid 14 and the upper surface 126 of the vane 124b of the rotor 12a so as to close the region 111f (see FIGS. 9 and 10).

  Further, even when the movable plates 25a and 25b move to a position where they contact the back surface 142 of the lid 14, a gap (upper surface (surface on the lid 14 side) 254 of the movable plates 25a and 25b and the back surface 142 of the lid 14 ( The pressure adjusting regions 111g and 111h (see FIG. 12) are formed so that the movable plate 25a is formed on the base member 250 made of a fan-shaped flat plate member and the entire outer peripheral portion of the base member 250 on the upper surface 254 side. A recess region (upper surface region) 257 surrounded by the edge portion 251 is formed. A thickness t from the lower surface 253 of the base member 250 to the upper surface 258 of the edge portion 251 has a thickness larger than the thickness t1 of the base member 150. The movable plate 25a, 25b, and the movable plate 25a, 25b, so that the viscous fluid 13 does not move from the gap between the edge 251 of the movable plate 25a, 25b, the side wall surface 113 of the cylindrical chamber 111, the partitions 115a, 115b, and the outer peripheral surface 122 of the rotor 12a. A lip seal or the like may be attached to the edge portion 251 of the 25b so as to improve the sealing performance.

  Further, in the upper surface region 257 of the movable plates 25a and 25b, a region 111a to which the viscous fluid 13 is pressurized when the rotor 12a is rotated in the forward rotation direction (α direction in the present embodiment, see FIG. 12), A first through hole 252 is formed in the vicinity of the edge 251 on the 111d (see FIG. 12) side.

  Further, in the upper surface region 257 of the movable plates 25a and 25b, regions 111b and 111c in which the viscous fluid 13 is decompressed when the rotor 12a is rotated in the forward rotation direction (α direction in the present embodiment, see FIG. 12). A second through hole 255 is formed in the vicinity of the edge 251 on the side (see FIG. 12). A guide member 256 that slidably holds the plate-like check valve 26 is formed in the upper surface region 257 of the movable plates 25a and 25b so that the second through hole 255 can be opened and closed.

  Next, the operation principle of the rotary damper 2 will be described. FIGS. 12A to 12C and FIGS. 13A to 13C are diagrams for explaining the operation principle of the rotary damper 2.

  As shown in FIG. 12 (A), when the rotor 12a rotates relative to the case 11 in the normal rotation direction (α direction in the present embodiment), as shown in FIG. 12 (B) and FIG. 12 (C). As shown, the viscous fluid 13 is formed from the pressurized region 111a between the upper surface region 257 of the movable plate 25a and the back surface 142 of the lid 14 via the first through hole 252 of the movable plate 25a. It moves to the pressure regulation area 111g. Then, the check valve 26 held by the guide member 256 of the movable plate 25a is pressed against the second through hole 255 of the movable plate 25a by the pressure of the viscous fluid 13, and the second through hole 255 of the movable plate 25a. Closes. Therefore, the area on the upper surface 254 side of the base member 250 of the movable plate 25a has a larger area for receiving the pressure of the pressurized viscous fluid 13 than the lower surface 253 side of the base member 250 of the movable plate 25a. The pressure in the pressure regulating region 111g on the upper surface 254 side of the base member 250 of 25a is higher than the pressure on the lower surface 253 side of the base member 250 of the movable plate 25a. Thereby, the movable plate 25a is pressed against the upper surface 126 of the vane 124a of the rotor 12a, and the adhesion between the upper surface 126 of the vane 124a of the rotor 12a and the lower surface 253 of the base member 250 of the movable plate 25a is improved.

  Similarly, from the pressurized region 111d, the viscous fluid 13 is formed between the upper surface region 257 of the movable plate 25b and the back surface 142 of the lid 14 through the first through hole 252 of the movable plate 25b. It moves to the pressure adjustment area 111h. Then, the check valve 26 held by the guide member 256 of the movable plate 25b is pressed against the second through hole 255 of the movable plate 25b by the pressure of the viscous fluid 13, and the second through hole 255 of the movable plate 25b. Closes. Therefore, the area of the movable plate 25b on the upper surface 254 side of the base member 250 that receives the pressure of the pressurized viscous fluid 13 becomes larger than the lower surface 253 side of the base member 250 of the movable plate 25b. The pressure in the pressure adjusting region 111h on the upper surface 254 side of the base member 250 of 25b is higher than the pressure on the lower surface 253 side of the base member 250 of the movable plate 25b. Thereby, the movable plate 25b is pressed against the upper surface 126 of the vane 124b of the rotor 12a, and the adhesion between the upper surface 126 of the vane 124b and the lower surface 253 of the base member 250 of the movable plate 25b is improved.

  As a result, between the region 111a and the region 111b delimited by the partitions 115a and 115b of the cylindrical chamber 111 and the vane 124a of the rotor 12a, and the region 111d delimited by the partitions 115a and 115b of the cylindrical chamber 111 and the vane 124b of the rotor 12a. The blocking property with the region 111c is improved, and the movement of the viscous fluid 13 from the regions 111a and 111d on the pressurized side to the regions 111b and 111c on the decompressed side is further restricted and pressurized. The pressure of the viscous fluid 13 in the side regions 111a and 111d is further increased, and a stronger braking torque is generated.

  On the other hand, as shown in FIG. 13A, when the rotor 12a rotates relative to the case 11 in the reverse direction (β direction in the present embodiment), FIG. 13B and FIG. As shown, the pressurized fluid 13 in the pressurized region 111b pushes up the check valve 26 held by the guide member 256 of the movable plate 25a, and passes through the second through hole 255 of the movable plate 25a. Then, it moves to the pressure adjusting region 111g formed between the upper surface region 257 of the movable plate 25a and the back surface 142 of the lid 14. And it moves to the area | region 111a via the 1st through-hole 252 of the movable plate 25a with the pressure of the viscous fluid 13. FIG. Similarly, the viscous fluid 13 in the pressurized region 111c pushes up the check valve 26 held by the guide member 256 of the movable plate 25b and is movable through the second through hole 255 of the movable plate 25b. It moves to the pressure regulating region 111h formed between the upper surface region 257 of the plate 25b and the back surface 142 of the lid 14. And it moves to the area | region 111d via the 1st through-hole 252 of the movable plate 25b with the pressure of the viscous fluid 13. FIG.

  As a result, a weak braking torque is generated without increasing the pressure of the viscous fluid 13 in the pressurized regions 111b and 111c.

  The second embodiment of the present invention has been described above.

  In the present embodiment, the rotary damper 2 that generates a braking torque with respect to the applied rotational force by restricting the movement of the viscous fluid 13 filled in the cylindrical chamber 111 via the pressure regulating regions 111g and 111h. As the rotational force increases and the pressure of the viscous fluid 13 increases, the partition between the regions 111a and 111b delimited by the partitions 115a and 115b of the cylindrical chamber 111 and the vane 124a of the rotor 12a, and the partition of the cylindrical chamber 111 The barrier property between the region 111d and the region 111c delimited by 115a, 115b and the vane 124b of the rotor 12a is improved.

  Specifically, the movable plate 25a is placed on the back surface 142 of the lid 14 so as to block the region 111e defined by one radial side surface 132a of the partition 115a of the cylindrical chamber 111 and the other radial side surface 133b of the partition 115b. And the upper surface 126 of the vane 124a of the rotor 12 so as to block the region 111f defined by the other radial side surface 132b of the partition 115a of the cylindrical chamber 111 and the one radial side surface 133a of the partition 115b. In addition, the movable plate 25 b is disposed between the back surface 142 of the lid 14 and the upper surface 126 of the vane 124 b of the rotor 12. Here, the first through holes 252 are formed in the movable plates 25a and 25b on the side of the regions 111a and 111d where the viscous fluid 13 is pressurized when the rotor 12a is rotated in the forward rotation direction, and the pressure is reduced. A second through hole 255 is formed on the regions 111b and 111c side. Further, a check valve 26 for opening and closing the second through hole 255 is provided in the upper surface region 257 of the movable plates 25a and 25b.

  When the rotor 12a is rotated relative to the case 11 in the forward rotation direction, the viscous fluid 13 passes through the first through hole 252 and the upper surface region 257 of the movable plates 25a and 25b and the lid 14. To the pressure regulating regions 111g and 111h separated by the back surface 142, and the check valve 26 is pressed against the second through hole 255 to close the second through hole 255. For this reason, the area of the movable plate 25a, 25b on the upper surface 254 side of the base member 250 is larger than the area of the movable plate 25a, 25b on the lower surface 253 side of the base member 250 that receives the pressure of the pressurized viscous fluid 13. Thus, the pressure in the pressure regulating regions 111g and 111f on the upper surface 254 side of the base member 250 of the movable plates 25a and 25b becomes higher than the pressure on the lower surface 253 side of the base member 250 of the movable plates 25a and 25b. Accordingly, the movable plates 25a and 25b are pressed against the upper surfaces 126 of the vanes 124a and 124b of the rotor 12a, and the adhesion between the upper surfaces 126 of the vanes 124a and 124b and the lower surfaces 253 of the base members 250 of the movable plates 25a and 25b is improved. .

  Therefore, according to the present embodiment, as the rotational force increases and the pressure of the viscous fluid 13 increases, the region 111a and the region 111b separated by the partitions 115a and 115b of the cylindrical chamber 111 and the vane 124a of the rotor 12a. Since the isolation between the region 111d and the region 111c separated by the partition 115a, 115b of the cylindrical chamber 111 and the vane 124b of the rotor 12a is improved, a stronger braking torque is generated with respect to the applied rotational force. Can be made.

  In the present embodiment, the second through hole 255 is closed in each of the movable plates 25a and 25b with respect to the relative rotation in the normal rotation direction of the rotor 12a with respect to the case 11, and the reverse rotation direction of the rotor 12a with respect to the case 11 is achieved. Is provided with a check valve 26 that opens the second through-hole 255 with respect to the relative rotation.

  Therefore, according to the present embodiment, it is possible to realize the unidirectional rotary damper 2 that can generate a strong braking torque only when a rotational force that rotates the rotor 12a in the forward rotation direction is applied. Can do.

  In the present embodiment, the movable plates 25a and 25b are disposed between the back surface 142 of the lid 14 and the top surfaces 126 of the vanes 124a and 124b of the rotor 12a. However, the present invention is not limited to this. The movable plates 25a and 25b may be disposed between the bottom surface 116 of the cylindrical chamber 111 and the lower surface 125 of the vanes 124a and 124b of the rotor 12a. Alternatively, it is arranged between the back surface 142 of the lid 14 and the upper surface 126 of the vanes 124a and 124b of the rotor 12a and between the bottom surface 116 of the cylindrical chamber 111 and the lower surfaces 125 of the vanes 124a and 124b of the rotor 12a. May be.

<Third embodiment>
In the first and second embodiments described above, the unidirectional rotary dampers 1 and 2 that generate a strong braking torque only with respect to rotation in the forward rotation direction have been described. On the other hand, in the present embodiment, a bidirectional rotary damper 3 that generates a strong braking torque against forward and reverse bidirectional rotation will be described.

  The rotary damper 3 according to the present embodiment is different from the rotary damper 2 according to the second embodiment shown in FIG. 9 in that movable plates 35a and 35b are provided instead of the movable plates 25a and 25b. Since the other configuration is the same as that of the rotary damper 2 according to the second embodiment, detailed description thereof will be omitted below.

  14A and 14B are a top view and a front view of the movable plates 35a and 35b, and FIGS. 14C and 14D are cross-sectional views taken along the line GG shown in FIG. FIG. 14E is an enlarged view of a portion C in FIG. 14C, and FIG. 14F is an enlarged view of a portion D in FIG. 14D.

  As shown in the drawing, one movable plate 35a has a region 111e in the cylindrical chamber 111 that is partitioned by one radial side surface 132a of the partition 115a of the cylindrical chamber 111 and the other radial side surface 133b of the partition 115b (FIG. 15). And a fan-like plate-like member, which is disposed between the rear surface 142 of the lid 14 and the upper surface 126 of the vane 124a of the rotor 12a so as to close the region 111e. Similarly, the other movable plate 35b is a region 111f in the cylindrical chamber 111 that is partitioned by the other radial side surface 132b of the partition 115a of the cylindrical chamber 111 and one radial side surface 133a of the partition 115b (see FIG. 15). And is disposed between the back surface 142 of the lid 14 and the upper surface 126 of the vane 124b of the rotor 12a so as to close the region 111f.

  Further, even when the movable plates 35a and 35b move to a position where the movable plates 35a and 35b come into contact with the back surface 142 of the lid 14, a gap (between the upper surface (surface on the lid 14 side) 354 of the movable plates 35a and 35b and the back surface 142 of the lid 14 ( The pressure control regions 111g and 111h (see FIG. 15) are formed, and the movable plates 35a and 35b are formed on the base member 350 made of a fan-shaped flat plate member and the entire outer peripheral portion of the base member 350 on the upper surface 354 side. A recess region (upper surface region) 358 surrounded by the edge portion 351 is formed. A thickness t from the lower surface 353 of the base member 350 to the upper surface 359 of the edge portion 351 is larger than the thickness t1 of the base member 350. It should be noted that the edge portion 351 is arranged so that the viscous fluid 13 does not move from the gap between the edge portion 351 of the movable plates 35a and 35b and the side wall surface 113 of the cylindrical chamber 111, the partitions 115a and 115b, and the outer peripheral surface 122 of the rotor 12a. A lip seal or the like may be attached to improve the sealing performance.

  Further, in the upper surface region 358 of the movable plates 35a and 35b, a region 111a to which the viscous fluid 13 is pressurized when the rotor 12a is rotated in the forward rotation direction (α direction in the present embodiment, see FIG. 15), A first through hole 352 is formed in the vicinity of the edge portion 351 on the 111d (see FIG. 15) side. A plate-like check valve 36a is slidably held so that the first through hole 352 can be opened and closed in the vicinity of the edge portion 351 on the region 111a, 111d side of the upper surface region 358 of the movable plates 35a, 35b. A guide member 357 is formed.

  Further, in the upper surface region 358 of the movable plates 35a and 35b, regions 111b and 111c in which the viscous fluid 13 is decompressed when the rotor 12a is rotated in the forward rotation direction (α direction in the present embodiment, see FIG. 15). A second through hole 355 is formed in the vicinity of the edge 351 on the side (see FIG. 15). A plate-like check valve 36b is slidably held so that the second through-hole 355 can be opened and closed in the vicinity of the edge 351 on the region 111b, 111c side of the upper surface region 358 of the movable plates 35a, 35b. A guide member 356 is formed.

  Next, the operation principle of the rotary damper 3 will be described. FIGS. 15A to 15D and FIGS. 16A to 16D are views for explaining the operation principle of the rotary damper 3.

  As shown in FIG. 15 (A), when the rotor 12a rotates relative to the case 11 in the normal rotation direction (α direction in the present embodiment), it is shown in FIGS. 15 (B) to 15 (D). As shown, the pressurized fluid 13 in the pressurized region 111a pushes up the check valve 36a held by the guide member 357 of the movable plate 35a and is movable from the first through hole 352 of the movable plate 35a. It moves to the pressure regulating region 111g formed between the upper surface region 358 of the plate 35a and the back surface 142 of the lid 14. Then, the check valve 36b held by the guide member 356 of the movable plate 35a is pressed against the second through hole 355 of the movable plate 35a by the pressure of the viscous fluid 13, and the second through hole 355 of the movable plate 35a. Closes. Therefore, the area of the movable plate 35a on the upper surface 354 side of the base member 350 that receives the pressure of the pressurized viscous fluid 13 is larger than that of the movable plate 35a on the lower surface 353 side of the base member 350. The pressure in the pressure regulating region 111g on the upper surface 354 side of the base member 350 of 35a is higher than the pressure on the lower surface 353 side of the base member 350 of the movable plate 35a. Thereby, the movable plate 35a is pressed against the upper surface 126 of the vane 124a of the rotor 12a, and the adhesion between the upper surface 126 of the vane 124a of the rotor 12a and the lower surface 353 of the base member 350 of the movable plate 35a is improved.

  Similarly, the viscous fluid 13 in the pressurized region 111d pushes up the check valve 36a held by the guide member 357 of the movable plate 35b, and from the first through hole 352 of the movable plate 35b, the movable plate It moves to the pressure regulating region 111h formed between the upper surface region 358 of 35b and the back surface 142 of the lid 14. Then, the check valve 36b held by the guide member 356 of the movable plate 35b is pressed against the second through hole 355 of the movable plate 35b by the pressure of the viscous fluid 13, and the second through hole 355 of the movable plate 35b. Closes. Therefore, the area of the movable plate 35b on the upper surface 354 side of the base member 350 that receives the pressure of the pressurized viscous fluid 13 is larger than the lower surface 353 side of the base member 350 of the movable plate 35b. The pressure in the pressure regulating region 111h on the upper surface 354 side of the base member 350 of 35b is higher than the pressure on the lower surface 353 side of the base member 350 of the movable plate 35b. Thereby, the movable plate 35b is pressed against the upper surface 126 of the vane 124a of the rotor 12a, and the adhesion between the upper surface 126 of the vane 124b of the rotor 12a and the lower surface 353 of the base member 350 of the movable plate 35b is improved.

  As a result, between the region 111a and the region 111b delimited by the partitions 115a and 115b of the cylindrical chamber 111 and the vane 124a of the rotor 12a, and the region 111d delimited by the partitions 115a and 115b of the cylindrical chamber 111 and the vane 124b of the rotor 12a. The blocking property with the region 111c is improved, and the movement of the viscous fluid 13 from the regions 111a and 111d on the pressurized side to the regions 111b and 111c on the depressurized side is further restricted, and the pressurized side The pressure of the viscous fluid 13 in the regions 111a and 111d is further increased, and a strong braking torque is generated.

  On the other hand, as shown in FIG. 16 (A), when the rotor 12a rotates relative to the case 11 in the reverse rotation direction (β direction in the present embodiment), FIG. 16 (B) to FIG. 16 (D). As shown in FIG. 4, the viscous fluid 13 in the pressurized region 111b pushes up the check valve 36b held by the guide member 356 of the movable plate 35a, and from the second through hole 355 of the movable plate 35a, It moves to the pressure regulating region 111g formed between the upper surface region 358 of the movable plate 35a and the back surface 142 of the lid 14. The check valve 36a held by the guide member 357 of the movable plate 35a is pressed against the first through hole 352 of the movable plate 35a by the pressure of the viscous fluid 13, and the first through hole 352 of the movable plate 35a. Closes. Therefore, the area of the movable plate 35a on the upper surface 354 side of the base member 350 that receives the pressure of the pressurized viscous fluid 13 is larger than that of the movable plate 35a on the lower surface 353 side of the base member 350. The pressure in the pressure regulating region 111g on the upper surface 354 side of the base member 350 of 35a is higher than the pressure on the lower surface 353 side of the base member 350 of the movable plate 35a. Thereby, the movable plate 35a is pressed against the upper surface 126 of the vane 124a of the rotor 12a, and the adhesion between the upper surface 126 of the vane 124a of the rotor 12a and the lower surface 353 of the base member 350 of the movable plate 35a is improved.

  Similarly, the viscous fluid 13 in the pressurized region 111c pushes up the check valve 36b held by the guide member 356 of the movable plate 35b, and from the second through hole 355 of the movable plate 35b, the movable plate It moves to the pressure regulating region 111h formed between the upper surface region 358 of 35b and the back surface 142 of the lid 14. The check valve 36a held by the guide member 357 of the movable plate 35b is pressed against the first through hole 352 of the movable plate 35b by the pressure of the viscous fluid 13, and the first through hole 352 of the movable plate 35b. Closes. Therefore, the area of the movable plate 35b on the upper surface 354 side of the base member 350 that receives the pressure of the pressurized viscous fluid 13 is larger than the lower surface 353 side of the base member 350 of the movable plate 35b. The pressure in the pressure regulating region 111h on the upper surface 354 side of the base member 350 of 35b is higher than the pressure on the lower surface 353 side of the base member 350 of the movable plate 35b. Thereby, the movable plate 35b is pressed against the upper surface 126 of the vane 124a of the rotor 12a, and the adhesion between the upper surface 126 of the vane 124b of the rotor 12a and the lower surface 353 of the base member 350 of the movable plate 35b is improved.

  As a result, between the region 111a and the region 111b delimited by the partitions 115a and 115b of the cylindrical chamber 111 and the vane 124a of the rotor 12a, and the region 111d delimited by the partitions 115a and 115b of the cylindrical chamber 111 and the vane 124b of the rotor 12a. The blocking property with the region 111c is improved, and the movement of the viscous fluid 13 from the regions 111b and 111c on the pressurized side to the regions 111a and 111d on the decompressed side is further limited and pressurized. The pressure of the viscous fluid 13 in the side regions 111b and 111c is further increased, and a strong braking torque is generated.

  The third embodiment of the present invention has been described above.

  Also in the present embodiment, as in the second embodiment, by restricting the movement of the viscous fluid 13 filled in the cylindrical chamber 111 via the pressure adjusting regions 111g and 111h, the applied rotational force can be reduced. In the rotary damper 3 that generates braking torque, the region 111a and the region 111b separated by the partitions 115a and 115b of the cylindrical chamber 111 and the vane 124a of the rotor 12a are increased as the rotational force increases and the pressure of the viscous fluid 13 increases. And between the region 111d and the region 111c defined by the partitions 115a and 115b of the cylindrical chamber 111 and the vane 124b of the rotor 12a is improved.

  Specifically, the movable plate 35a is placed on the back surface 142 of the lid 14 so as to close a region 111e defined by one radial side surface 132a of the partition 115a of the cylindrical chamber 111 and the other radial side surface 133b of the partition 115b. And the upper surface 126 of the vane 124a of the rotor 12a, and closes the region 111f defined by the other radial side surface 132b of the partition 115a of the cylindrical chamber 111 and the one radial side surface 133a of the partition 115b. In addition, the movable plate 35b is disposed between the back surface 142 of the lid 14 and the upper surface 126 of the vane 124b of the rotor 12a. Here, the first through holes 352 are formed in the movable plates 35a and 35b on the side of the regions 111a and 111d where the viscous fluid 13 is pressurized when the rotor 12a is rotated in the forward rotation direction, and the pressure is reduced. A second through-hole 355 is formed on the regions 111b and 111c side. In addition, a check valve 36 a for opening and closing the first through hole 352 and a check valve 36 b for opening and closing the second through hole 355 are provided in the upper surface region 358 of the movable plates 35 a and 35 b.

  When the rotor 12a is rotated in the forward rotation direction relative to the case 11, the viscous fluid 13 pushes up the check valve 36a and the movable plates 35a and 35b through the first through holes 352. The pressure control regions 111g and 111h separated by the upper surface region 358 and the back surface 142 of the lid 14 are moved, and the check valve 36b is pressed against the second through hole 355 to close the second through hole 355. For this reason, the upper plate 354 side of the base member 350 of the movable plates 35a and 35b has a larger area for receiving the pressure of the pressurized viscous fluid 13 than the lower plate 353 side of the base member 350 of the movable plates 35a and 35b. Thus, the pressure in the pressure adjusting regions 111g and 111f on the upper surface 354 side of the base member 350 of the movable plates 35a and 35b is higher than the pressure on the lower surface 353 side of the base member 350 of the movable plates 35a and 35b. Accordingly, the movable plates 35a and 35b are pressed against the upper surfaces 126 of the vanes 124a and 124b of the rotor 12a, and the adhesion between the upper surfaces 126 of the vanes 124a and 124b and the lower surfaces 353 of the base members 350 of the movable plates 35a and 35b is improved. .

  Further, when the rotor 12a is rotated relative to the case 11 in the reverse rotation direction, the viscous fluid 13 pushes up the check valve 36b, and the movable plates 35a and 35b pass through the second through hole 355. It moves to the pressure regulating regions 111g and 111h separated by the upper surface region 358 and the back surface 142 of the lid 14, and the check valve 36a is pressed against the first through hole 352 to close the first through hole 352. For this reason, the upper plate 354 side of the base member 350 of the movable plates 35a and 35b has a larger area for receiving the pressure of the pressurized viscous fluid 13 than the lower plate 353 side of the base member 350 of the movable plates 35a and 35b. Thus, the pressure in the pressure adjusting regions 111g and 111f on the upper surface 354 side of the base member 350 of the movable plates 35a and 35b is higher than the pressure on the lower surface 353 side of the base member 350 of the movable plates 35a and 35b. As a result, the pressure of the viscous fluid 13 in the pressure adjusting regions 111g and 111h increases, and the movable plates 35a and 35b are pressed against the upper surfaces 126 of the vanes 124a and 124b, and the upper surfaces 126 of the vanes 124a and 124b and the movable plates 35a and 35b. Adhesion with the lower surface 353 of the base member 350 is improved.

  For this reason, according to the present embodiment, as the rotational force increases and the pressure of the viscous fluid 13 increases, the region 111a and the region 111b separated by the partitions 115a and 115b of the cylindrical chamber 111 and the vane 124a of the rotor 12 are separated. Since the isolation between the region 111d and the region 111c separated by the partition 115a, 115b of the cylindrical chamber 111 and the vane 124b of the rotor 12a is improved, a stronger braking torque is generated with respect to the applied rotational force. Can be made.

  Further, according to the present embodiment, the bidirectional rotary damper 3 capable of generating a strong braking torque even when a rotational force that rotates the rotor 12a in either the forward or reverse direction is applied. Can do.

  In the present embodiment, the movable plates 35a and 35b are disposed between the back surface 142 of the lid 14 and the top surface 126 of the vanes 124a and 124b, but the present invention is not limited to this. The movable plates 35a and 35b may be disposed between the bottom surface 116 of the cylindrical chamber 111 and the lower surfaces 125 of the vanes 124a and 124b. Or you may make it arrange | position between both the back surface 142 of the lid | cover 14, and the upper surface 126 of vane 124a, 124b, and between the bottom surface 116 of the cylindrical chamber 111, and the lower surface 125 of vane 124a, 124b.

  Further, in the rotary dampers 1 to 3 according to the first to third embodiments, a pair of partitions 115a and 115b are provided in the cylindrical chamber 111, and a pair of vanes 124a and 124b are provided in the rotors 12 and 12a. However, the present invention is not limited to this. The same number of vanes as the partitions formed in the cylindrical chamber 111 may be formed in the rotors 12 and 12a, and the number thereof is not limited. In this case, the same number of movable plates as the partitions are required.

  Further, the rotary dampers 1 to 3 according to the first to third embodiments can be widely applied to seat seats with a reclining function used in, for example, automobiles, railway vehicles, airplanes, ships, and the like.

1-3: Rotary damper 11: Case, 12, 12a: Rotor, 13: Viscous fluid, 14: Lid, 15a, 15b: Movable plate, 16: Check valve, 25a, 25b: Movable plate, 26: Check valve 35a, 35b: movable plate, 36a, 36b: check valve, 110: center line of the cylindrical chamber 111, 111: cylindrical chamber, 112: case main body, 113: inner peripheral surface of the case main body 112 (on the side of the cylindrical chamber 111) Wall surface), 114: tip surfaces of the partitions 115a and 115b, 115a and 115b: partitions, 116: bottom surface of the cylindrical chamber 111, 117: opening of the cylindrical chamber 111, 118: flange portion, 118a: screw hole of the flange portion 118, 119: upper surface of case body 112, 120: rotating shaft of rotors 12 and 12a, 121: through hole of rotors 12 and 12a, 122: outer peripheral surface of rotors 12 and 12a, 123: base 124a, 124b tip surfaces, 124a, 124b: vanes, 125: lower surfaces of vanes 124a, 124b, 126: upper surfaces of vanes 124a, 124b, 127: lip seals, 128a, 128b: flow paths, 129a: rotors 12, 12a 129b: upper end of the rotor 12, 12a, 131: rotor body, 132a, 132b: side surface of the partition 115a, 133a, 133b: side surface of the partition 115b, 141: opening of the lid 14, 142: opening of the lid 14 Back surface, 143a: through-hole of lid 14, 150: base member of movable plates 15a, 15b, 151: edge of base member 150, 152: first through-hole of movable plates 15a, 15b, 153: base member 150 Lower surface, 154: Upper surface of the base member 150, 155: Upper surface region of the movable plates 15a and 15b, 25 : Base member of movable plates 25a and 25b, 251: edge of base member 250, 252: first through hole of movable plates 25a and 25b, 253: lower surface of base member 250, 254: upper surface of base member 250, 255 : Second through hole of movable plates 25a and 25b, 256: guide member of check valve 26, 257: upper surface area of movable plates 25a and 25b, 350: base member of movable plates 35a and 35b, 351: base member 350 352: first through hole of movable plates 35a, 35b, 353: lower surface of base member 350, 354: upper surface of base member 350, 355: second through hole of movable plates 35a, 35b, 356: Guide member of check valve 36b, 357: Guide member of check valve 36a, 358: Upper surface region of movable plates 35a and 35b, 1281: First flow path section, 1282: Second 1283: Stopper of the check valve 16 1284: Boundary between the first flow path section and the second flow path section

Claims (4)

A rotary damper that generates a braking torque against an applied rotational force by limiting the movement of the filled viscous fluid,
A case comprising a cylindrical chamber having an upper surface opened and filled with the viscous fluid;
A rotor accommodated in the cylindrical chamber so as to rotate relative to the case around a center line of the cylindrical chamber by the rotational force;
A movable plate housed in the cylindrical chamber and arranged to be movable in the direction of the center line of the cylindrical chamber;
A lid attached to the upper surface side of the cylindrical chamber, for confining the rotor and the movable plate together with the viscous fluid in the cylindrical chamber;
On the inner wall surface of the cylindrical chamber,
A convex partition is formed in which the front end surface is close to the outer peripheral surface of the rotor,
On the outer peripheral surface of the rotor,
A vane whose tip surface is close to the inner wall surface of the cylindrical chamber is formed,
The movable plate is
Of the regions that are arranged between the lid and the vane or between the bottom surface of the cylindrical chamber and the vane so as to block the region that is partitioned by the partition, the region is divided by the partition and the vane. In contrast, when the rotor is rotated relatively in the first rotation direction, a first through hole is formed on the region side where the viscous fluid is pressurized in the region,
The viscous fluid is
When the rotor is rotated relative to the case in the first rotation direction, the region partitioned by the movable plate and the lid through the first through hole, or the movable plate The rotary damper moves to a pressure adjusting region that is a region divided by the bottom of the cylindrical chamber and presses the movable plate against the vane. The rotary damper according to claim 1,
At least one of the partition and the vane is formed with a flow path that connects regions partitioned by the partition and the vane.
Due to the pressure of the viscous fluid, the flow path is closed against relative rotation of the rotor in the first rotation direction with respect to the case, and is opposite to the first rotation direction of the rotor with respect to the case. A rotary damper further comprising a check valve that opens the flow path with respect to relative rotation in the second rotation direction. The rotary damper according to claim 1,
The movable plate is
Of the regions delimited by the partition and the vanes, the region closer to the region where the viscous fluid in the region is depressurized when the rotor is rotated relative to the case in the first rotational direction. Two through holes are formed,
Due to the pressure of the viscous fluid, the second through hole is closed with respect to the rotation of the rotor relative to the case in the first rotation direction, and the second rotation direction of the rotor relative to the case The rotary damper further includes a first check valve that opens the second through hole with respect to relative rotation to the rotary damper. The rotary damper according to claim 3,
Due to the pressure of the viscous fluid, the first through hole is opened with respect to the rotation of the rotor relative to the case in the first rotation direction, and the second rotation direction of the rotor relative to the case A second check valve that closes the first through-hole with respect to relative rotation to
When the rotor is rotated in the first rotation direction with respect to the case, the viscous fluid opens the second check valve, and the pressure adjusting region through the first through hole. And stays in the pressure regulating region where the second through hole is closed by the first check valve, and presses the movable plate against the upper surface or the lower surface of the vane,
When the rotor is rotated relative to the case in the second rotation direction, the viscous fluid opens the first check valve and passes through the second through hole. Moving to a pressure regulating region, staying in the pressure regulating region where the first through hole is closed by the second check valve, and pressing the movable plate against the upper surface or the lower surface of the vane. Rotary damper.

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