JP2018151000A - Rotary damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple rotary damper capable of increasing attenuation force without enlarging the rotary damper.SOLUTION: A rotary damper includes: a rotary plate set 7 in which magnetic inner plates 41 and outer plates 43 supported by a rotary shaft 5 and a case 3 capable of relatively rotating are alternately disposed; a functional fluid F which interposes between the inner plates 41 and the outer plates 43, and generate attenuation force in relative rotations of the inner plates 41 and the outer plates 43 by allowing a magnetic flux loop R pass through; magnetism parting portion 29b which are provided at intermediate portions between inner peripheral portions 41a and 43a and outer peripheral portions 41b and 43b with regard to the inner plates 41 and the outer plates 43; a magnetic end portion member 45 which is disposed on one end portion side of the rotary plate set 7, and is laid between the inner peripheral portions 41a and the outer peripheral portions 41b of the inner plate 41 at one end portion of the rotary plate set 7; and permanent magnets 9 which are disposed on the other end portion side of the rotary plate set 7, and in which different magnetic poles 49a and 49b oppose to the inner peripheral portions 41a and the outer peripheral portions 41b of the inner plate 41 of the rotary plate sent 7.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotary damper that generates a damping force using a functional fluid such as a magnetic fluid or a magnetorheological fluid.

  As a conventional rotary damper, for example, as disclosed in Patent Document 1, a first torque transmission member, a second torque transmission member, a first torque transmission member, and a second torque transmission member that are supported by a relatively rotatable outer member and a rotation shaft, respectively. A permanent magnet that has a magnetic viscous fluid interposed in a gap with the torque transmission member and different magnetic poles opposite to each other on the outer sides in the axial direction of the first and second torque transmission members and generates a magnetic flux penetrating the magnetic viscous fluid There is something with.

  In such a conventional rotary damper, the magnetic viscous flow can generate a damping force in the relative rotation between the first torque transmission member and the second torque transmission member by the magnetic flux from one of the magnetic poles to the other.

  However, the conventional rotary damper has a limit in the generated damping force because the magnetic flux is formed only in one direction between the opposing magnetic poles. For this reason, in order to secure a damping force, it is inevitable to increase the size of the rotary damper, for example, by increasing the number of first torque transmission members and second torque transmission members.

JP 2013-204656 A

  The problem to be solved is that the rotating damper becomes large in order to secure the damping force.

  According to the present invention, in order to ensure a damping force without increasing the size of the rotary damper, an inner plate and an outer plate made of a magnetic material, which are respectively supported by an inner rotating member and an outer rotating member capable of relative rotation, are alternately arranged. A rotating plate set that is arranged, and a functional fluid that generates a damping force in the relative rotation between the inner plate and the outer plate by passing magnetic flux between the inner plate and the outer plate of the rotating plate set. A magnetic dividing portion provided at an intermediate portion between the inner peripheral portion and the outer peripheral portion with respect to each of the inner plate and the outer plate, and one end portion of the rotating plate set disposed on one end side of the rotating plate set. An end member made of a magnetic material extending over the inner and outer peripheral portions of the inner plate or outer plate located on the other end of the rotating plate set, and the other end of the rotating plate set. In The inner plate or the outer plate of the inner plate and the outer peripheral portion of the inner plate and the outer peripheral portion of the inner plate and the outer peripheral portion of the permanent magnet facing different magnetic poles, the permanent magnet from one magnetic pole to the outer plate of the inner plate and the outer plate And the first magnetic flux passing through one of the inner peripheral portions to the end member, and from the end member to the other magnetic pole through the other of the outer peripheral portion and the inner peripheral portion of the inner plate and the outer plate. The main feature of the rotary damper is to form a second magnetic flux.

  The rotary damper of the present invention can form the first magnetic flux and the second magnetic flux in different directions between the inner peripheral portion and the outer peripheral portion of the rotary plate set, and can ensure a damping force without increasing the size. In addition, since the permanent magnet is disposed only on the other end side of the rotating plate set, and an end member made of a magnetic material is disposed on the one end portion side of the rotating plate set, the structure can be simplified. it can.

It is sectional drawing of a rotation damper (Example). It is sectional drawing of a rotation damper (Example). It is a fragmentary sectional view which expands and shows the permanent magnet and partition plate of FIG. 1 (Example). It is a graph which shows the relationship between braking torque and the distance between a permanent magnet and a rotating plate set (Example).

  For the purpose of ensuring damping force without increasing the size of the rotary damper, a magnetic dividing part is provided in each of the inner and outer peripheral middle parts of the magnetic plate of the rotary plate set and the rotary plate set is sandwiched between them. This is realized by arranging the permanent magnet and the end member made of a magnetic material, and forming the first magnetic flux and the second magnetic flux in different directions at the inner peripheral portion and the outer peripheral portion of the rotating plate set.

  That is, the rotating damper includes a rotating plate set in which inner plates and outer plates made of a magnetic material, which are respectively supported by an inner rotating member and an outer rotating member capable of relative rotation, are alternately arranged, and an inner plate and an outer plate of the rotating plate set. A functional fluid that causes a damping force to be generated in the relative rotation between the inner plate and the outer plate by passing magnetic flux between them, and an intermediate portion between the inner peripheral portion and the outer peripheral portion with respect to the inner plate and the outer plate, respectively. A magnetic dividing portion provided; and an end member made of a magnetic material that is disposed on one end portion side of the rotating plate set and spans the inner and outer peripheral portions of the inner plate or the outer plate located at one end portion of the rotating plate set; A permanent magnet disposed on the other end portion side of the rotating plate set and facing different magnetic poles to the inner and outer peripheral portions of the inner plate or outer plate located at the other end portion of the rotating plate set. The permanent magnet includes a first magnetic flux that extends from one magnetic pole through one of the outer peripheral portion and inner peripheral portion of the inner plate and outer plate to the end member, and the outer peripheral portion and inner peripheral portion of the inner plate and outer plate from the end member. A second magnetic flux is formed through the other of the magnetic poles to reach the other magnetic pole.

  The outer rotating member is a non-magnetic case, the inner rotating member is a non-magnetic rotating shaft, and the permanent magnet can move close to and away from the other end of the rotating plate set outside the case. The structure supported by may be sufficient.

  In addition, the case has a partition plate made of a magnetic material positioned between the permanent magnet and the other end of the rotating plate set, and the permanent magnet forms first and second magnetic fluxes via the partition plate. It may be.

  The partition plate is located on at least one side of the rotation radius direction of the inner / outer rotation member with respect to the permanent magnet, and the rotation radius of the inner / outer rotation member is moved to the permanent magnet according to the separation movement of the permanent magnet with respect to the other end portion of the rotation plate set. You may provide the side part which the part which overlaps in a direction reduces gradually.

  The side part of the partition plate may have a tapered shape in which the surface facing the permanent magnet gradually separates from the permanent magnet in accordance with the separation movement.

[Structure of rotating damper]
1 and 2 are cross-sectional views of a rotary damper according to an embodiment of the present invention. FIG. 1 shows a state in which the damping force is maximum, and FIG. 2 shows a state in which the damping force is off. In the following, the “axial direction” means the direction of the rotational axis of the simple rotational damper (hereinafter simply referred to as “rotational damper”) 1. Further, “radial direction” means the rotational radius direction of the rotary damper 1.

  The rotary damper 1 according to the present embodiment generates a damping force for a movable side such as a sliding door (not shown).

  As shown in FIGS. 1 and 2, the rotary damper 1 includes a case 3 as an outer rotating member, a rotating shaft 5 as an inner rotating member, a rotating plate set 7, and a permanent magnet 9.

  The case 3 is made of a non-magnetic material and is made of, for example, a resin. The material of the case 3 may be made of a nonmagnetic material, and can be formed of a nonmagnetic metal, ceramic, or the like. As the nonmagnetic metal, for example, copper, aluminum, stainless steel or the like can be used. Hereinafter, the same applies to non-magnetic materials.

  The case 3 has a damper housing 11 and a magnet housing 13 formed on both sides in the axial direction.

  In this embodiment, the case 3 includes a hollow cylindrical case main body 15, which is partitioned by a partition plate 17 at an intermediate portion in the axial direction, and a damper housing 11 and A magnet housing 13 is defined on the other side.

  The damper housing 11 has a concave shape that opens on one side in the axial direction, and the concave opening portion is closed by a lid portion 19 made of a nonmagnetic material. The lid portion 19 is integrally attached to the case body 15 by welding or the like. A through hole 21 is formed in the axial center portion of the lid portion 19.

  The magnet housing 13 has a concave shape that opens on the other side in the axial direction, and the permanent magnet 9 is accommodated therein.

  The partition plate 17 is made of a magnetic material and is located between the permanent magnet 9 and the rotating plate set 7. The magnetic body constituting the partition plate 7 is, for example, soft magnetic material such as iron or silicon steel. Hereinafter, the same applies to magnetic materials. The partition plate 17 of the present embodiment has a partition plate main body 23 and ribs 25 as side portions.

  The partition plate body 23 is formed in a plate shape and is fitted to the inner periphery of the case body 15. A magnetic dividing portion 29 a is interposed in an intermediate portion between the inner and outer peripheries of the partition plate body 23.

  The magnetic dividing portion 29a magnetically divides the inner peripheral portion 23a and the outer peripheral portion 23b of the partition plate main body 23. In the present embodiment, the magnetic dividing portion 29a is made of a nonmagnetic material. In addition, the magnetic dividing part 29a should just be able to magnetically divide the inner peripheral part 23a and the outer peripheral part 23b of the partition plate main body 23, and a hole (space part) etc. may be sufficient as it.

  In the damper housing 11, a bearing recess 31 for the rotary shaft 5 is provided in the axial center portion of the inner peripheral portion 23 a of the partition plate body 23, and in the magnet housing 13, a thread portion of a drive mechanism 53 described later. 57 support boss portions 33 are integrally provided.

  The boss portion 33 protrudes from the partition plate body 23 to the vicinity of the central portion in the axial direction of the magnet housing 13. An axial mounting hole 35 is provided on the inner periphery of the boss portion 33, and the outer peripheral side of the boss portion 33 constitutes an inner peripheral rib 25 a of the rib 25.

  The rib 25 is located on at least one side in the radial direction with respect to the permanent magnet 9. In this embodiment, it has an outer peripheral rib 25b as an outer peripheral side portion and an inner peripheral rib 25a as an inner peripheral side portion, and is located on both sides in the radial direction with respect to the permanent magnet 9. The rib 25 can be configured to be positioned on one side in the radial direction with respect to the permanent magnet 9 if any one of the outer peripheral rib 25b and the inner peripheral rib 25a is omitted.

  The outer peripheral rib 25 b is provided corresponding to the fitting groove 27 of the case body 15 and is fitted into the fitting groove 27. That is, the fitting groove 27 is partially provided in the circumferential direction on the inner periphery of the case body 15. In this embodiment, for example, a total of four fitting grooves 27 are provided every 90 degrees. A total of four outer peripheral ribs 25 b are provided corresponding to the fitting grooves 27 in the circumferential direction of the case body 15, for example, every 90 degrees.

  The outer peripheral rib 25 b protrudes from the partition plate body 23 to the vicinity of the central portion of the magnet housing 13 in the axial center direction, and has the same protruding height as the boss portion 33.

  The inner peripheral side surface 37 of the outer peripheral rib 25 b faces the permanent magnet 9. The inner peripheral side surface 37 has a tapered shape so that the thickness gradually decreases toward the other side in the axial direction (the end of the outer peripheral rib 25b). Therefore, as will be described later, when the permanent magnet 9 moves away (proximity movement) with respect to the rotating plate set 7, the inner peripheral side surface 37 gradually separates (proximity) from the permanent magnet 9 according to the separation movement (proximity movement). )

  The inner peripheral rib 25a has a cross-sectional shape that is line-symmetric with the outer peripheral rib 25b with the central axis in the axial direction of the permanent magnet 9 as the axis of symmetry. That is, the inner peripheral rib 25a has a tapered shape so that the outer peripheral side surface 39 faces the permanent magnet 9 and gradually becomes thinner toward the other side in the axial direction (the tip of the boss portion 33). For this reason, when the permanent magnet 9 also moves away (proximity movement) with respect to the rotating plate set 7, the outer peripheral side surface 39 of the inner peripheral rib 25 a is gradually separated from the permanent magnet 9 according to the separation movement (proximity movement) ( Close). In addition, although the inner peripheral rib 25a is provided in the whole circumferential direction with respect to the boss | hub part 33, it is also possible to provide in the circumferential direction partially corresponding to the outer peripheral rib 25b.

  The rotating shaft 5 is made of a non-magnetic material and is formed in a columnar shape extending in the axial direction. The rotary shaft 5 is supported by the recess 31 of the partition plate 17 in the damper housing 11 of the case 3 and inserted through the through hole 21 of the lid portion 19 so that the rotary shaft 5 can rotate relative to the case 3. It has become. A seal member 22 made of an O-ring or the like is held in the through hole 21 and the space between the lid portion 19 and the rotary shaft 5 is sealed.

  The outer end of the rotating shaft 5 is disposed outside the damper housing 11. A gear or the like is attached to the outer end, and torque from the movable side is input.

  A rotating plate set 7 is provided between the rotating shaft 5 and the damper housing 11 of the case 3.

  The rotating plate set 7 is configured by alternately arranging a plurality of magnetic inner plates 41 and a plurality of magnetic outer plates 43 in the axial direction. A gap is provided between the adjacent inner plate 41 and outer plate 43. The functional fluid F is present in this gap.

  As the functional fluid F, a magnetic fluid in which iron powder or the like is dispersed or a magnetorheological fluid called MR fluid is used. The functional fluid F is interposed between the inner plate 41 and the outer plate 43, forms a cluster of iron powder or the like by passing a magnetic flux loop R described later, and shears relative rotation between the inner plate 41 and the outer plate 43. A damping force is generated by resistance. The damping force increases or decreases according to the increase or decrease of the magnetic flux density of the magnetic flux loop R.

  The inner plate 41 and the outer plate 43 are supported so as to be rotatable together with the rotating shaft 5 and the case 3 that can rotate relative to each other. Specifically, the inner plate 41 is supported by the damper housing 11 on the outer periphery of the rotating shaft 5, and the outer plate 43 is supported by the outer periphery of the inner plate 41 on the inner periphery of the case body 15 in the damper housing 11. Has been.

  Each of the inner plate 41 and the outer plate 43 is provided with a magnetic dividing portion 29b.

  The magnetic dividing portion 29b is provided in an intermediate portion between the inner peripheral portions 41a and 43a and the outer peripheral portions 41b and 43b of the inner plate 41 and the outer plate 43, and is aligned along the axial direction as a whole. The magnetic dividing portions 29b may not be aligned along the axial direction, and may be slightly displaced in the radial direction as long as there is no short circuit of the magnetic circuit in the rotating plate set 7.

  These magnetic dividing portions 29b are made of a non-magnetic material like the magnetic dividing portions 29a of the partition plate body 23. However, the magnetic dividing portion 29b may be a hole (space portion) or the like as long as the inner peripheral portions 41a and 43a and the outer peripheral portions 41b and 43b of the inner plate 41 and the outer plate 43 can be magnetically divided.

  End members 45 and permanent magnets 9 are arranged on the end side of the rotating plate set 7, respectively.

  The end member 45 is a plate-like body made of a magnetic material, and is arranged on one end side of the rotating plate set 7. The end member 45 secures a gap for interposing the functional fluid F with the inner plate 41 located at one end of the rotating plate set 7. The end member 45 extends so as to extend over the inner peripheral portion 41 a and the outer peripheral portion 41 b of the inner plate 41 at one end of the rotating plate set 7 in the radial direction.

  The end member 45 is not limited to a plate-like body as long as the end member 45 extends over the inner peripheral portion 41 a and the outer peripheral portion 41 b of the inner plate 41 at one end of the rotating plate set 7. In the present embodiment, the inner plate 41 is positioned at one end of the rotating plate set 7. However, the outer plate 43 may be positioned depending on the characteristics of the rotating damper 1 depending on the use. What is necessary is just to be extended so that the inner peripheral part 43a and the outer peripheral part 43b of the inner board 41 or the outer board 43 located in one end part may be extended.

  The permanent magnet 9 is a ring shape made of an alnico magnet, a ferrite magnet, a neodymium magnet or the like, and a plurality of permanent magnets 9 are arranged in the circumferential direction of the rotating plate set 7. For example, a total of four are provided every 90 degrees corresponding to the outer peripheral rib 25b. Each permanent magnet 9 is accommodated in a magnet housing 13 of the case 3 and is opposed to the other end of the rotating plate set 7 via a partition plate 17.

  Specifically, the permanent magnet 9 has an opening 47 concentric with the magnetic dividing portions 29a and 29b, and different magnetic poles 49a and 49b are located inside and outside the magnetic dividing portions 29a and 29b in the radial direction. These magnetic poles 49a and 49b are respectively connected to the inner peripheral portion 41a and the outer peripheral portion 41b of the inner plate 41 located at the other end of the rotating plate set 7 in the axial direction via the inner peripheral portion 17a and the outer peripheral portion 17b of the partition plate 17, respectively. Facing each other.

  Therefore, the permanent magnet 9 has, on one side in the axial direction, the inner peripheral portion 17a and the outer peripheral portion 17b of the partition plate 17, the inner peripheral portions 41a and 43a and the outer peripheral portions 41b and 43b of the inner plate 41 and the outer plate 43, In addition, a magnetic circuit is formed between the magnetic poles 49 a and 49 b via the end member 45.

  The partition plate 17 secures a gap for interposing the functional fluid F with the inner plate 41 located at the other end of the rotating plate set 7.

  On the other side in the axial direction, the permanent magnet 9 is supported by a magnet holder 51 made of a magnetic material. The magnet holder 51 is formed in a plate shape and extends between the magnetic poles 49a and 49b of the permanent magnet 9 in the radial direction.

  Therefore, the permanent magnet 9 forms a magnetic circuit between the magnetic poles 49a and 49b by the magnet holder 51 on the other side in the axial direction.

  As a result, the permanent magnet 9 forms a magnetic flux loop R on the magnetic circuit. The magnetic flux loop R refers to a loop-shaped magnetic flux. The magnetic loop R has a first magnetic flux R1 and a second magnetic flux R2. The first magnetic flux R <b> 1 reaches the end member 45 from one magnetic pole 49 a through the outer peripheral portions 41 b and 43 b of the inner plate 41 and the outer plate 43. The second magnetic flux R <b> 2 is a magnetic flux folded back by the end member 45, and reaches the other magnetic pole 49 b from the end member 45 through the other of the inner peripheral portions 41 a and 43 a of the inner plate 41 and the outer plate 43.

  In the magnetic flux loop R, the magnetic flux density increases or decreases according to the distance of the permanent magnet 9 from the rotating plate set 7. The permanent magnet 9 of the present embodiment is movable in the axial direction within the magnet housing 13 by the drive mechanism 53.

  For this reason, the magnetic flux loop R has the highest magnetic flux density when closest to the rotating plate set 7, and the magnetic flux density decreases as the distance from the rotating plate set 7 increases. The magnetic flux loop R disappears when the permanent magnet 9 moves away from the rotating plate set 7 by a certain amount or more, depending on the characteristics of the rotary damper 1.

  The drive mechanism 53 includes, for example, a screw drive mechanism and includes a nut portion 55 and a screw portion 57.

  The nut portion 55 is configured by providing a female screw portion 59 at the axial center portion of the magnet holder 51. The nut portion 55 is screwed into the screw portion 57, and can move close to and away from the rotating plate set 7 by the rotation of the screw portion 57.

  The screw portion 57 is rotatably supported by the boss portion 33 of the partition plate 17 by a pin 63. Specifically, the screw portion 57 is formed in a rod shape, and a pin 63 inserted through the inside is attached to the attachment hole 35 of the boss portion 33. A male screw portion 61 is formed on the outer periphery of the screw portion 57, and the male screw portion 61 is screwed into the female screw portion 57 of the nut portion 55.

  The screw portion 57 is integrally provided with a driving gear portion 65. A drive gear 69 of an electric motor 67 is engaged with the gear portion 65. For this reason, the screw portion 57 is configured to be rotationally driven by the electric motor 67.

[Rotation damper operation]
The rotary damper 1 is used, for example, by connecting the rotary shaft 5 to the movable side such as a sliding door and fixing the case 3 to the fixed side.

  In this rotary damper 1, the permanent magnet 9 is moved close to and away from the rotary plate set 7 by the electric motor 67 and the drive mechanism 53, and the damping force can be switched between the on state and the off state.

  Further, when the damping force is switched between the on state and the off state or when the damping force is on, the permanent magnet 9 can be moved closer to and away from the rotating plate set 7 to adjust the damping force. .

  As a result, in this embodiment, the rotary damper 1 having various characteristics can be realized. For example, the damping force is increased either in the early stage or the later stage of the rotating body 3, or the damping force during the rotation of the rotating body 3 is increased. Can be made substantially constant.

  Specifically, as shown in FIG. 1, when the permanent magnet 9 is brought close to the rotating plate set 7 by a certain distance or more, the magnetic flux loop R is formed and the damping force is turned on. When torque is input to the rotary shaft 5 from the movable side in this ON state, the relative rotation of the rotary shaft 5 with respect to the case 3 is attenuated.

  That is, relative rotation occurs between the inner plate 41 of the rotating plate set 7 that rotates integrally with the rotating shaft 5 and the outer plate 43 coupled to the case 3. With respect to this relative rotation, when the magnetic flux loop R passes between the inner plate 41 and the outer plate 43, the functional fluid F forms a cluster of iron powder or the like, and a braking torque is applied by the shear resistance of the cluster. As a result, the rotary damper 1 can generate a damping force.

  At this time, the magnetic flux loop R of the present embodiment has two magnetic fluxes, a first magnetic flux R1 passing through the outer peripheral portions 41b and 43b of the inner plate 41 and the outer plate 43 and a second magnetic flux R2 passing through the inner peripheral portions 41a and 43a. Since the magnetic flux passes through the inner plate 41 and the outer plate 43, a damping force can be secured by efficiently using the magnetic flux.

  On the other hand, as shown in FIG. 2, when the permanent magnet 9 is separated from the rotating plate set 7 by a certain distance or more, the magnetic flux loop R disappears and the damping force is turned off. In this OFF state, the functional fluid F does not form a cluster, and relative rotation of the inner plate 41 and the outer plate 43 of the rotating plate set 7 is allowed.

  Further, when the damping force is adjusted, a damping force corresponding to the distance between the permanent magnet 9 and the rotating plate set 7 can be generated by the proximity and separation of the permanent magnet 9 with respect to the rotating plate set 7. At this time, the first magnetic flux R1 and the second magnetic flux R2 of the magnetic flux loop R are formed via the partition plate 17, but the abrupt change of the magnetic flux density passing through the partition plate 17 is suppressed by the rib 25, thereby adjusting the damping force. Stability and accuracy can be improved.

  FIG. 3 is an enlarged partial sectional view showing the permanent magnet 9 and the partition plate 17 of FIG. 1, (A) is a state in which the permanent magnet 9 is closest to the rotating plate set 7, and (B) is a permanent magnet. 9 shows a state of being separated from the rotating plate set 7.

  As shown in FIG. 3, the ribs 25 are located on both sides in the radial direction with respect to the permanent magnet 9, and over the permanent magnet 9 in the radial direction in accordance with the separation movement (proximity movement) of the permanent magnet 9 with respect to the rotating plate set 7. The wrapping portion P gradually decreases (increases). Due to the decrease (increase) of the overlapping portion P, the magnetic flux density passing through the partition plate 17 can be gradually decreased (increase).

  Further, the rib 25 has a tapered shape on the inner peripheral side surface 37 of the outer peripheral rib 25b and the outer peripheral side surface 39 of the inner peripheral rib 25a facing the permanent magnet 9, so that the permanent magnet 9 moves away from the rotating plate set 7 (proximity movement). Accordingly, the permanent magnet 9 is gradually separated (closed), so that the magnetic flux density passing through the partition plate 17 can be gradually decreased (increased) more reliably.

  FIG. 4 is a graph showing the relationship between the braking torque and the distance between the permanent magnet 9 and the rotating plate set 7.

  As shown in FIG. 4, in the present embodiment having the ribs 25, the braking torque (damping force) can be reduced more linearly as the distance between the permanent magnet 9 and the rotating plate set 7 decreases. On the other hand, in the comparative example without the ribs 25, the magnetic flux density is reduced by the square of the distance between the permanent magnet 9 and the rotating plate set 7, so that the braking torque is greatly reduced at the beginning of the distance reduction and thereafter the braking torque is reduced. Becomes smaller and changes to a quadratic curve as a whole.

[Effect of Example]
The rotary damper 1 of this embodiment includes a rotary plate set 7 in which magnetic inner plates 41 and outer plates 43 that are supported by a relatively rotatable rotary shaft 5 and a case 3 are alternately arranged, and the rotary plate set 7. A functional fluid F that is interposed between the inner plate 41 and the outer plate 43 and causes a relative rotation between the inner plate 41 and the outer plate 43 by passing through the magnetic flux loop R, and the inner plate 41 and the outer plate 43. Are arranged on one end side of the rotating plate set 7 and the magnetic dividing portion 29b provided in the intermediate portion between the inner peripheral portions 41a and 43a and the outer peripheral portions 41b and 43b. An end member 45 made of a magnetic material across the inner peripheral portion 41 a and the outer peripheral portion 41 b of the inner plate 41 positioned, and the other end portion side of the rotating plate set 7 are positioned at the other end portion of the rotating plate set 7. That each of the inner peripheral portion 41a and the outer peripheral portion 41b different magnetic poles 49a of the inner plate 41, 49b comprises a permanent magnet 9 facing.

  The permanent magnet 9 includes a first magnetic flux R1 extending from one magnetic pole 49a to the end member 45 through the outer peripheral portions 41b and 43b of the inner plate 41 and the outer plate 43, and the inner plate 41 and the outer plate 43 from the end member 45. A second magnetic flux R2 reaching the other magnetic pole 49b through the inner peripheral portions 41a and 43a is formed.

  Accordingly, in this embodiment, the first magnetic flux R1 and the second magnetic flux R2 in different directions can be formed in the inner peripheral portions 41a, 43a and the outer peripheral portions 41b, 43b of the rotating plate set 7, and the magnetic fluxes are efficiently used. Thus, the damping force can be ensured without increasing the size. Moreover, since the permanent magnet 9 is disposed only on the other end side of the rotating plate set 7 and an end member 45 made of a magnetic material is disposed on the one end portion side of the rotating plate set 7, the structure is simplified. Can also be planned.

  The permanent magnet 9 is supported outside the case 3 so as to be movable toward and away from the other end of the rotating plate set 7. The case 3 is located between the permanent magnet 9 and the other end of the rotating plate set 7. The permanent magnet 9 has first and second magnetic fluxes R <b> 1 and R <b> 2 with the rotating plate set 7 via the partition plate 17.

  Therefore, in this embodiment, the damping force is reliably adjusted according to the movement of the permanent magnet 9 while the functional fluid F is enclosed and reliably interposed between the inner plate 41 and the outer plate 43 of the rotating plate set 7. be able to.

  Further, the partition plate 17 is located on at least one side in the radial direction with respect to the permanent magnet 9, on both sides in the present embodiment, and the permanent magnet 9 is moved according to the separation movement of the permanent magnet 9 with respect to the other end of the rotating plate set 7. In addition, ribs 25 that gradually reduce the overlapping portion in the radial direction are provided.

  Therefore, in the present embodiment, the first magnetic flux R1 and the second magnetic flux R2 of the magnetic flux loop R are formed via the partition plate 17, but the rib 25 suppresses a sudden change in the magnetic flux density passing through the partition plate 17 and attenuates it. The stability and accuracy of force adjustment can be improved.

  Further, the rib 25 of the present embodiment can be simplified in structure by forming the inner peripheral rib 25 a using the outer peripheral portion of the boss portion 33.

1 Rotating damper 3 Case (outside rotating member)
5 Rotating shaft (inner rotating member)
7 Rotating plate set 9 Permanent magnet 17 Partition plate 25 Ribs 29a, 29b Magnetic fracture portion 37 Inner circumferential side surface (rib surface)
39 Peripheral side (rib surface)
41 inner plate 41a inner peripheral part 41b outer peripheral part 43 outer plate 43a inner peripheral part 41b outer peripheral part 45 end member F functional fluid R magnetic flux loop (magnetic flux)
R1 First magnetic flux R2 Second magnetic flux

Claims (5)

A rotating plate set in which inner plates and outer plates made of a magnetic material supported by an inner rotating member and an outer rotating member, which are relatively rotatable, are alternately arranged;
A functional fluid that generates a damping force in relative rotation between the inner plate and the outer plate by passing magnetic flux between the inner plate and the outer plate of the rotating plate set;
A magnetic dividing portion provided in an intermediate portion between the inner peripheral portion and the outer peripheral portion with respect to each of the inner plate and the outer plate;
An end member made of a magnetic material that is disposed on one end portion side of the rotating plate set and spans the inner peripheral portion and the outer peripheral portion of the inner plate or outer plate located at one end portion of the rotating plate set;
A permanent magnet disposed on the other end portion side of the rotating plate set and having different magnetic poles facing the inner and outer peripheral portions of the inner plate or outer plate located at the other end portion of the rotating plate set. Prepared,
The permanent magnet includes a first magnetic flux that extends from one magnetic pole through one of the outer peripheral portion and the inner peripheral portion of the inner plate and the outer plate to the end member, and the inner plate and the end member from the end member. Forming a second magnetic flux reaching the other magnetic pole through the other of the outer peripheral portion and the inner peripheral portion of the outer plate,
Rotating damper characterized by that. The rotary damper according to claim 1,
The outer rotating member is a non-magnetic case,
The inner rotating member is a non-magnetic rotating shaft,
The permanent magnet is supported so as to be able to move close to and away from the other end of the rotating plate set outside the case.
Rotating damper characterized by that. The rotary damper according to claim 2,
The case has a partition plate made of a magnetic material positioned between the permanent magnet and the other end of the rotating plate set,
The permanent magnet forms the first and second magnetic fluxes via the partition plate,
Rotating damper characterized by that. The rotary damper according to claim 3,
The partition plate is located on at least one side in the rotational radius direction of the inner and outer rotating members with respect to the permanent magnet, and the permanent plate is moved to the permanent magnet according to the separation movement of the permanent magnet with respect to the other end portion of the rotating plate set. The side part which overlaps in the direction of the rotation radius was gradually reduced,
Rotating damper characterized by that. The rotary damper according to claim 4, wherein
The side portion of the partition plate has a tapered shape in which the surface facing the permanent magnet gradually separates from the permanent magnet in accordance with the separation movement.
Rotating damper characterized by that.

Images