JP2017187140A - Rotary damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary damper capable of surely exhibiting a sufficient damper effect in a case of varying attenuation force.SOLUTION: A rotary damper includes: a magnetic case 7; a magnetic rotor 9 disposed in the case 7 in a relatively rotatable manner; a working fluid F that is stored in the case 7 and interposed between the case 7 and the rotor 9, and whose viscosity gets higher by making a magnetic flux loop M pass therethrough; an electric magnet 11 configured to generate the magnetic flux loop M; a first rotational shaft 33 drawn out from the rotor 9 to the outside of the case 7; and a planetary gear mechanism 5 interlockingly connected to the first rotational shaft 33 outside the case 7.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotary damper that makes a damping force variable by utilizing a viscosity change of a magnetic fluid or a magnetorheological fluid.

  As a conventional rotary damper, for example, there is a braking device described in Patent Document 1.

  This braking device encloses a magnetic viscous fluid in a magnetic case, accommodates a magnetic rotating plate in a relatively rotatable manner, and includes an electromagnetic coil in the case. A magnetic flux loop is formed by energization of the electromagnetic coil, and the viscosity of the magnetorheological fluid is increased between the case and the rotating plate.

  Therefore, such a braking device increases the resistance to relative rotation between the case and the rotating plate according to the viscosity of the magnetorheological fluid. For example, if one of the case and the rotating plate is fixed and used, the braking torque (damping force) is increased. Can be generated. Further, the braking torque can be made variable by energization control of the electromagnetic coil.

  However, the energization control of the electromagnetic coil can change the braking torque within the adjustment range between the maximum value and the minimum value determined from the structure of the braking device, but it is not possible to change the adjustment range of the braking torque itself. Can not.

  For this reason, there is a possibility that a sufficient damper effect cannot be exhibited, for example, when there is a large input torque with respect to the maximum value of the braking torque.

  Further, in an environment where there is a small input torque with respect to the maximum value of the constant braking torque, the entire adjustment range of the damper braking torque cannot be effectively used, and there is a possibility that a sufficient damper effect cannot be exhibited.

  Such a problem also occurs in a rotary damper that uses, for example, a permanent magnet instead of an electromagnetic coil and changes the position of the permanent magnet to make the braking torque variable.

JP 2014-20539 A

  The problem to be solved is that even if the damping force is variable by utilizing the viscosity change of the magnetic fluid or the magnetorheological fluid, the sufficient damper effect cannot be exhibited.

  In order to exhibit a sufficient damper effect when the damping force is variable, the present invention provides a magnetic case, a magnetic rotary member disposed in the case so as to be relatively rotatable, A working fluid housed in a case and interposed between the case and the rotating body to increase the viscosity when magnetic flux passes through, a magnet for generating the magnetic flux, and the rotating body drawn out of the case. The main feature is a rotary damper including the first rotary shaft and a planetary gear mechanism connected to the first rotary shaft outside the case.

  The rotary damper of the present invention can transmit the input torque to the rotating body while changing the input torque according to the gear ratio of the planetary gear mechanism, so that the maximum value of the braking torque can be substantially changed and the braking torque can be adjusted within that range. Thus, when the damping force is made variable by utilizing the change in the viscosity of the magnetic fluid or the magnetorheological fluid, the adjustment range can be widened to exhibit a sufficient damper effect.

It is sectional drawing of a rotation damper. Example 1 FIG. 2 is a partially omitted front view showing a planetary gear mechanism of the rotary damper of FIG. 1. (Example) It is sectional drawing of a rotation damper. (Example 2)

  The purpose of reliably exhibiting a sufficient damper effect when the damping force is made variable by utilizing the viscosity change of magnetic fluid or magnetorheological fluid is realized by providing a planetary gear mechanism.

  In other words, the rotary damper is composed of a magnetic case, a magnetic rotary member disposed in the case so as to be relatively rotatable, and a magnetic flux generated by being interposed between the case and the rotary member. A working fluid that increases in viscosity by passing through, a magnet that generates magnetic flux, a first rotating shaft that is drawn out of the case from the rotating body, and a planetary gear mechanism that is linked to the first rotating shaft outside the case. With.

  The planetary gear mechanism includes an internal gear provided so as to be rotatable integrally with the case, a sun gear provided so as to be rotatable integrally with the first rotating shaft, and an intermediate gear and the sun gear. You may provide the planetary gear provided, the planet carrier which supports a planet gear, and the 2nd rotating shaft provided in the planet carrier so that integral rotation was possible.

  The case is provided in an end wall portion located on the planetary gear mechanism side in the direction of the rotation axis of the first rotation shaft, and through the end wall portion, and supports the first rotation shaft so as to be rotatable and positioned in the radial direction. It has a hole for drawing to be determined and a boss provided around the hole outside the case with respect to the end wall, and the internal gear is an annular member attached to the case. It is good also as a structure positioned by radial direction.

  The case includes a support cylinder portion provided around the hole portion in the case with respect to the end wall portion, and the magnet has an electromagnetic coil supported on the outer periphery of the support cylinder portion and includes the support cylinder portion and the end wall portion. The electromagnet may be a yoke, and the internal gear may be fixed to the end wall of the case.

  The rotary damper may include a mounting plate supported between the end wall portion and the internal gear.

  The case includes an end wall portion located on the planetary gear mechanism side in the rotation axis direction of the first rotation shaft, and a gear housing cylinder portion that projects in the rotation axis direction relative to the end wall portion and accommodates the planetary gear mechanism. The internal gear may be provided integrally with the gear housing cylinder.

  The planetary gear mechanism may include a lid portion that is attached to the opening of the gear housing cylinder portion and positions the planet carrier in the direction of the rotation axis with the end wall portion of the case.

[Structure of rotating damper]
FIG. 1 is a cross-sectional view of a rotary damper according to an embodiment of the present invention, and FIG. 2 is a partially omitted front view showing a planetary gear mechanism of the rotary damper of FIG. In FIG. 2, the planet carrier and the cap portion are omitted.

  The rotary damper 1 of this embodiment includes a damper main body 3 and a planetary gear mechanism 5, and attenuates the damper main body 3 by changing the input torque according to the gear ratio of the planetary gear mechanism 5.

  The damper main body 3 includes a case 7, a rotating body 9, a working fluid F, and an electromagnet 11. The damper main body 3 uses one of the case 7 and a second rotating shaft 63 of the planetary gear mechanism 5 to be described later, so that the viscosity of the working fluid F to be described later with respect to the relative rotation between the case 7 and the rotating body 9 is used. A braking torque (damping force) is generated by a resistance corresponding to.

  In the damper main body 3 of the present embodiment, the case 7 is fixed and used, and the second rotating shaft 63 of the planetary gear mechanism 5 is interlocked and connected to the movable side. When the second rotating shaft 63 of the planetary gear mechanism 5 is fixed, the case 7 may be interlocked and connected to the movable side.

  The case 7 includes a case main body 13 and a lid portion 23.

  The case main body 13 is formed of a magnetic material as a whole. As the magnetic body, for example, soft magnetic material such as iron or silicon steel can be used. The case main body 13 is integrally provided with a peripheral wall portion 15, an end wall portion 17, and a support cylinder portion 19.

  The peripheral wall portion 15 is formed in a hollow cylindrical shape, and an end wall portion 17 is provided on one inner periphery of the axial direction (the same as the rotational axis direction of the first rotation shaft 33). The peripheral wall portion 15 is provided with a high magnetic resistance portion 15a made of a concave portion or a nonmagnetic material. The high magnetic resistance portion 15 a has a relatively high magnetic resistance relative to the other portions of the peripheral wall portion 15.

  The end wall portion 17 has a circular shape as a whole, and is integrally formed on one inner circumference of the peripheral wall portion 15 via a relatively thin connecting portion 17a. As a result, the end wall portion 17 is positioned on the planetary gear mechanism 5 side in the direction of the rotation axis of the first rotation shaft 33.

  One side of the end wall portion 17 in the axial direction protrudes outside the case 7 with respect to the peripheral wall portion 15 and the connecting portion 17a. The other side in the axial direction of the end wall portion 17 protrudes into the case 7 with respect to the connecting portion 17 a, and the outer peripheral portion forms part of the working chamber 31 a with the peripheral wall portion 15.

  A hole portion 25 through which the first rotating shaft 33 of the rotating body 9 is inserted is provided in the inner peripheral portion of the end wall portion 17. Around the hole portion 25, a boss portion 21 is provided outside the case 7 with respect to the end wall portion 17, and a support cylinder portion 19 is provided inside the case 7.

  The boss portion 21 is an annular convex portion provided integrally with the end wall portion 17 and projecting out of the case 7 in the axial direction. The inner circumference of the boss portion 21 constitutes a part of the hole portion 25, and the outer circumference of the boss portion 21 constitutes a positioning portion for the planetary gear mechanism 5 with respect to the internal gear 55.

  The support cylinder portion 19 has a hollow cylindrical shape, is provided integrally with the end wall portion 17, and protrudes into the case 7 in the axial direction. A clearance for passing the rotating body 9 is secured between the tip of the support cylinder portion 19 and the lid portion 23.

  The inner periphery of the support cylinder part 19 constitutes a part of the hole 25, and the outer periphery of the support cylinder part 19 constitutes a support part of the electromagnetic coil 51 of the electromagnet 11.

  The lid 23 is fixed to the case body 13 on the other inner circumference of the peripheral wall 15 by a stopper 27 such as a snap ring. A sealing member 29 such as an O-ring is interposed between the lid portion 23 and the case body 13.

  The lid portion 23 has a disk shape formed of a nonmagnetic material such as a resin or a nonmagnetic metal as a whole. Examples of the nonmagnetic metal include copper and aluminum. The lid portion 23 defines the rotating body 9 and the working fluid F containing chamber 31 together with the peripheral wall portion 15, the end wall portion 17, and the support cylinder portion 19 of the case main body 13. Further, the lid portion 23 is formed with a curved portion 23a on the outer peripheral side, and absorbs the volume change of the working fluid F in the case 7 by elastic deformation.

  The rotating body 9 is configured such that the first rotating shaft 33 and the rotating body main body 35 are integrally formed of a magnetic body.

  The 1st rotating shaft 33 is formed in the column shape. The first rotating shaft 33 is inserted through the hole 25 of the case 7 as described above, and the distal end portion is drawn out of the case 7. The first rotating shaft 33 is supported in the hole 25 of the case 7 via bearings 37a and 37b. Thus, the first rotating shaft 33 is positioned in the radial direction, and the rotating body 9 is supported by the case 7 so as to be relatively rotatable via the first rotating shaft 33 and the support cylinder portion 19, and is positioned in the radial direction. . A space is maintained between the bearings 37 a and 37 b by a spacer 39. The spacer 39 also serves to form a magnetic path.

  Inside the case 7 with respect to the bearings 37a and 37b, a seal member 41 such as an X ring is disposed between the first rotating shaft 33 and the hole 25, and further inside the case 7 with respect to the seal member 41, A filter 43 is disposed between the first rotation shaft 33 and the hole 25. The filter 43 captures the fine particles in the working fluid F so as not to reach the seal member 41 side and protects the seal member 41. A rotating body main body 35 is integrally coupled to the proximal end portion of the first rotating shaft 33 further inside the filter 43.

  The rotator main body 35 is a part that is accommodated in the accommodation chamber 31 in the case 7. The rotating body main body 35 includes a rotating cylinder portion 47 on the outer peripheral portion of the rotating plate portion 45.

  The rotating plate portion 45 has a disk shape extending in the radial direction from the proximal end portion of the first rotating shaft 33 in the accommodation chamber 31. The middle part of the inner and outer circumferences of the rotating plate part 45 has a bulging part 49 bulging toward the electromagnetic coil 51 side of the electromagnet 11 in the direction of the rotational axis, Opposing in the radial direction. The bulging portion 49 is provided with an oil passage 49a penetrating in the axial direction. The outer peripheral portion of the rotating plate portion 45 faces the working chamber 31a of the storage chamber 31 and reaches the rotating cylinder portion 47 located in the working chamber 31a.

  The rotating cylinder portion 47 extends along the peripheral wall portion 15 of the case 7 on the outer peripheral side of the electromagnetic coil 51. The rotary cylinder portion 47 is provided with a high magnetic resistance portion 47a made of a concave portion or a nonmagnetic material. The outer periphery of the rotating cylinder portion 47 is opposed to the inner periphery of the peripheral wall portion 15 in the radial direction with a gap, and the inner periphery of the rotating cylinder portion 47 is the end wall portion of the case 7 at the electromagnetic coil 51 and the distal end portion of the electromagnet 11. It opposes in the radial direction with a clearance gap between the outer peripheral parts of 17.

  The working fluid F is accommodated in the accommodating chamber 31 of the case 7 and passes between the rotating body 9 and the case 7. As the working fluid F, a magnetic fluid or a magnetorheological fluid called an MR fluid is used. For this reason, the working fluid F increases viscosity by passing the magnetic flux loop M of the electromagnet 11.

  The electromagnet 11 includes an electromagnetic coil 51. The electromagnetic coil 51 is supported on the outer periphery of the support cylinder portion 19 of the case 7 and is abutted against the end wall portion 17 in the direction of the rotation axis. The electromagnetic coil 51 is prevented from coming off from the support cylinder portion 19 by a stopper 53 such as a snap ring. Thereby, the electromagnetic coil 51 comprises the electromagnet 11 which uses the support cylinder part 19 and the end wall part 17 as a yoke.

  Therefore, the electromagnet 11 can form the magnetic flux loop M via the support cylinder portion 19 and the end wall portion 17. By this magnetic flux loop M, the viscosity of the working fluid F is changed between the case 7 and the rotating body 9 to generate a braking torque (damping force) between the case 7 and the rotating body 9. In addition, although the magnetic flux loop M is shown only in the upper half in FIG. 1, it also occurs symmetrically in the lower half.

  The braking torque can be adjusted within an adjustment range between a maximum value and a minimum value determined from the structure by energization control of the electromagnetic coil 51 of the electromagnet 11. Therefore, the rotational damper 1 has a variable damping force.

  The planetary gear mechanism 5 includes an internal gear 55, a sun gear 57, a planetary gear 59, a planet carrier 61, a second rotating shaft 63, and a cap portion 65. The internal gear 55 is provided so as to be integrally rotatable with respect to the case 7. The internal gear 55 of the present embodiment is formed of a non-magnetic material such as resin and is an annular member that is attached to the case 7. The internal gear 55 includes a main body portion 55a and a gear portion 55b.

  The main body portion 55a is an annular portion having a plate thickness equivalent to that of the end wall portion 17 of the case 7 in the rotational axis direction. A fitting hole 55aa is defined on the inner periphery of the main body 55a. The fitting hole 55aa is fitted to the outer periphery of the boss portion 21 of the case 7. Thus, the internal gear 55 is positioned in the radial direction by the boss portion 21 of the case 7.

  Further, the main body 55a is fastened by a fastener 67 such as a bolt every predetermined interval in the circumferential direction, for example, every 45 degrees, in a state of being abutted against the end wall 17 of the case 7 in the rotational axis direction. It is fixed. Since the end wall portion 17 has a sufficient thickness to form the yoke of the electromagnet 11, the internal gear 55 can be securely fixed. A mounting plate 69 may be sandwiched between the main body portion 55 a of the internal gear 55 and the end wall portion 17 of the case 7. The mounting plate 69 is for fixing the case 7 of the damper main body 3 to the fixed side. In the drawing, the mounting plate 69 is indicated by a two-dot chain line in a state where the mounting plate 69 overlaps the main body portion 55 a of the internal gear 55.

  The outer peripheral portion of the main body portion 55 a has a diameter equivalent to the portion outside the case 7 of the end wall portion 17 of the case 7 against which the main body portion 55 a is abutted, and together with the outer peripheral portion of the end wall portion 17 outside the case 7. A radial recess 71 is defined. A flange portion 55ab that projects to the outer peripheral side is provided on the outer peripheral portion of the main body portion 55a. A gear portion 55b is integrally provided on the outer peripheral portion of the flange portion 55ab.

  The gear portion 55b is an annular portion that protrudes toward the opposite side of the case 7 in the direction of the rotation axis with respect to the flange portion 55ab, and a tooth portion 55ba is formed on the inner periphery. On the outer periphery of the internal gear 55 extending from the gear portion 55b to the flange portion 55ab, a plurality of projection portions 55bb for attaching the cap portion 65 are provided at a predetermined interval in the circumferential direction, for example, six for every sixty.

  The sun gear 57 is provided on the first rotation shaft 33 so as to be integrally rotatable. The sun gear 57 of the present embodiment is formed in a disk shape from a non-magnetic material, for example, resin, and has a tooth portion 57a on the outer periphery. An attachment hole 57 b is formed on the inner periphery of the sun gear 57, and the attachment hole 57 b is fitted and fixed to the outer periphery of the tip end portion of the first rotation shaft 33 of the damper main body 3. In addition, between the front-end | tip of the 1st rotating shaft 33 and the sun gear 57, the rotation prevention by what is called a double D cut is made | formed.

  A gear boss portion 57 c that protrudes toward the case 7 in the direction of the rotation axis is provided on the inner peripheral portion of the sun gear 57. The gear boss portion 57 c is abutted against a step portion 33 a that uses a detent of the first rotating shaft 33. Accordingly, the tooth portion 57a of the sun gear 57 is positioned so as to face the tooth portion 55ba of the internal gear 55 in the radial direction.

  The planetary gear 59 is interposed between the internal gear 55 and the sun gear 57. The planetary gear 59 is formed in a disk shape with a nonmagnetic material, for example, resin, and a plurality of planetary gears 59 are provided in the circumferential direction, for example, every 45 degrees.

  A tooth portion 59 a is provided on the outer periphery of the planetary gear 59. The toothed portion 59a of the planetary gear 59 meshes with the toothed portion 55ba of the internal gear 55 and the toothed portion 57a of the sun gear 57, and the sun gear 59 is located between the internal gear 55 and the sun gear 57. It is designed to rotate and revolve. A support hole 59b is provided on the inner periphery of the planetary gear 59, and is supported by the planet carrier 61 through the support hole 59b.

  The planet carrier 61 is formed of a metal in a disc shape, and is arranged with a planetary gear 59 interposed between the main body portion 55a of the internal gear 55 in the direction of the rotational axis. The metal here may be either a magnetic material or a non-magnetic material. The planet carrier 61 may be formed of resin. The planetary carrier 61 is provided with a plurality of gear rotation shafts 61a for supporting the planetary gear 59 in the circumferential direction.

  The gear rotation shaft 61 a has a cylindrical shape protruding from the planet carrier 61 toward the planetary gear 59 in the direction of the rotation axis, and is inserted through the support hole 59 b of the planetary gear 59. The tip of the gear rotation shaft 61 a is abutted against the main body 55 a of the internal gear 55 together with the planetary gear 59.

  The second rotating shaft 63 is provided on the planetary carrier 61 so as to be integrally rotatable. The second rotating shaft 63 of the present embodiment is a columnar shape provided integrally with the axial center portion of the planet carrier 61. The second rotation shaft 63 projects from the planet carrier 61 to the opposite side of the case 7 in the direction of the rotation axis.

  The cap portion 65 is attached to the internal gear 55, covers the planetary gear mechanism 5, and supports the second rotation shaft 63. The cap portion 65 is configured by including a disc-shaped cap end wall portion 65b on a circular cap-shaped peripheral wall portion 65a.

  The cap peripheral wall portion 65a is provided with an opening 65aa at a position corresponding to the protrusion 55bb of the internal gear 55. A protrusion 55bb of the internal gear 55 is engaged with the opening 65aa.

  The cap end wall portion 65b is disposed along the planet carrier 61, and the shaft support portion 65bb of the second rotating shaft 63 is provided on the inner peripheral side. The shaft support portion 65bb inserts the second rotating shaft 63 through the bearing 73 on the inner periphery and supports it rotatably.

[Rotation damper operation]
For example, the rotary damper 1 connects (couples) the case 7 so as to be linked to the fixed side and the second rotary shaft 63 of the planetary gear mechanism 5 to be linked to the movable side to be attenuated. As a result, the first rotating shaft 33 of the rotating body 9 is coupled to the movable side via the planetary gear mechanism 5. The case 7 may be coupled to the movable side, and the second rotating shaft 63 of the planetary gear mechanism 5 may be coupled to the fixed side.

  When the magnetic flux loop M is formed by energization control of the electromagnetic coil 51, a braking torque (damping force) is generated with respect to the input torque input from the movable side.

  Specifically, when the input torque is received by the second rotating shaft 63 of the planetary gear mechanism 5, the second rotating shaft 63 rotates to rotate the planet carrier 61 integrally. The planetary carrier 61 revolves while rotating the planetary gear 59 between the internal gear 55 and the sun gear 57, and rotates the sun gear 57 with respect to the fixed internal gear 55. The sun gear 57 rotates the first rotating shaft 33 integrally, and as a result, the entire rotating body 9 is rotated with respect to the case 7.

  At this time, in this embodiment, the rotation by the input torque of the second rotating shaft 63 is accelerated according to the gear ratio of the planetary gear mechanism 5 and transmitted to the first rotating shaft 33 (rotating body 9). Therefore, the torque (transmission torque) transmitted to the rotating body 9 is smaller than the initial input torque according to the speed increase.

  With respect to this transmission torque, the damper main body 3 can increase the viscosity of the working fluid F by the magnetic flux loop M by the energization control of the electromagnetic coil 51, and can generate the braking torque.

  For this reason, in the rotary damper 1, even if the input torque exceeds the maximum value of the braking torque determined from the structure, the input torque can be reduced below the maximum value of the braking torque by the gear ratio, and a sufficient damper effect is exhibited. can do.

  If the planetary gear mechanism is attached in the direction opposite to the rotational axis, the transmission torque can be increased with respect to the input torque. In this case, in an environment where the input torque is always small relative to the maximum value of the braking torque, the input torque can be brought close to or matched with the maximum value of the braking torque. Can exhibit a sufficient damper effect.

  When mounting the planetary gear mechanism in the reverse direction, the second rotation shaft and the planet carrier are separated, and the planet carrier is rotated in the reverse direction to the present embodiment so as to rotate integrally with the first rotation shaft 33 of the damper main body 3. The second rotating shaft is provided so as to rotate in conjunction with the movable side in the same manner as in the embodiment, the sun gear is provided on the second rotating shaft so as to be integrally rotatable, and the internal gear is provided on the fixed side or the damper. What is necessary is just to provide integrally in case 7 of the main body 3, and to provide a planetary gear between a sun gear and an internal gear.

[Effect of Example 1]
The rotary damper 1 of the present embodiment includes a magnetic case 7, a magnetic rotary member 9 disposed in the case 7 so as to be relatively rotatable, and the case 7 and the rotary member 9 housed in the case 7. The working fluid F that increases in viscosity when the magnetic flux loop M passes through the electromagnet 11, the electromagnet 11 that generates the magnetic flux loop M, and the first rotating shaft drawn out of the case 7 from the rotating body 9. 33 and the planetary gear mechanism 5 connected to the first rotating shaft 33 outside the case 7.

  Accordingly, the rotary damper 1 can transmit the input torque to the rotating body 9 while changing the input torque in accordance with the gear ratio of the planetary gear mechanism 5, so that the maximum value of the braking torque is substantially changed. By making it possible to adjust the braking torque, when the damping force is made variable by utilizing the change in the viscosity of the magnetic fluid or the magnetorheological fluid, the adjustment range can be widened and a sufficient damper effect can be reliably exhibited.

  The rotary damper 1 of this embodiment includes an internal gear 55 in which the planetary gear mechanism 5 is provided so as to be integrally rotatable with the case 7, and a sun gear 57 that is provided so as to be integrally rotatable with the first rotating shaft 33. The planetary gear 59 interposed between the internal gear 55 and the sun gear 57, the planetary carrier 61 that supports the planetary gear 59, and the second rotating shaft that is provided on the planetary carrier 61 so as to be integrally rotatable. 63.

  For this reason, in this embodiment, when the input torque is reliably reduced, the planetary gear mechanism 5 can be easily and reliably interlocked with the first rotating shaft 33 and the overall structure can be made compact.

  The case 7 is provided through the end wall 17 and the end wall 17 located on the planetary gear mechanism 5 side in the direction of the rotation axis of the first rotation shaft 33, and rotatably supports the first rotation shaft 33. And a boss portion 21 provided around the hole portion 25 outside the case 7 with respect to the end wall portion 17, and the internal gear 55 is connected to the case 7. An annular member attached to the case 7 and positioned in the radial direction by the boss portion 21 of the case 7.

  For this reason, the internal gear 55 is positioned with respect to the hole 25 by the boss portion 21 and the sun gear 57 is positioned via the first rotating shaft 33. Therefore, the sun gear 57 and the internal gear 55 are Positioning can be accurately performed and stable operation can be performed.

  Further, the magnet of the present embodiment is an electromagnet 11 having a magnetic coil 51 supported on the outer periphery of the support cylinder portion 19 and having the support cylinder portion 19 and the end wall portion 17 as a yoke. The end wall 17 of the case 7 is fixed.

  Therefore, since the end wall portion 17 has a sufficient thickness to form the yoke of the electromagnet 11, the internal gear 55 can be securely fixed.

  Further, the rotary damper 1 can include an attachment plate 69 supported between the end wall portion 17 and the internal gear 55 by using the attachment of the planetary gear mechanism 5, and the planetary gear mechanism 5 The support of the mounting plate 69 can be stabilized between the tamper body 3 and the tamper body 3.

  FIG. 3 is a cross-sectional view of the rotary damper according to the second embodiment of the present invention. Since the basic structure of this embodiment is the same as that of the first embodiment, the same reference numerals are used for the corresponding parts, or the same reference numerals are denoted by A, and redundant description is omitted.

  In the rotary damper 1A of the present embodiment, the internal gear 55A of the planetary gear mechanism 5A is integrally provided in the case 7A of the damper main body 3A.

  That is, the case 7A includes a gear housing cylinder portion 75 that protrudes outward from the peripheral wall portion 15A of the case main body 13A in the rotation axis direction. The gear housing cylinder portion 75 has a cylindrical shape similar to the peripheral wall portion 15A of the case body 13A, and houses the planetary gear mechanism 5A.

  As in the first embodiment, the planetary gear mechanism 5A includes an internal gear 55A, a sun gear 57A, a planetary gear 59A, a planet carrier 61A, and a second rotating shaft 63A.

  The internal gear 55 </ b> A is integrally provided with a tooth portion 55 </ b> Aba adjacent to the peripheral wall portion 15 on the inner periphery of the base end portion of the gear housing cylinder portion 75.

  The sun gear 57A is attached to the tip of the first rotating shaft 33 of the damper main body 3A as in the first embodiment, but the internal gear 55 is closer to the case 7A side than the first embodiment. For this reason, the gear boss portion is omitted and the case 7A is arranged closer to the case 7A side.

  The planetary gear 59A is interposed between the internal gear 55A and the sun gear 57A as in the first embodiment.

  The planetary carrier 61A is formed in a step shape on the inner peripheral side in the direction of the rotation axis, and defines a recess 61Ab that avoids the tip of the first rotation shaft 33 on the case 7A side in the direction of the rotation axis. A second rotating shaft 63A is integrally provided on the opposite side to the recess 61Ab.

  On the outer peripheral side of the planetary carrier 61A, a plurality of gear rotation shafts 61Aa for supporting the planetary gear 59A are provided in the circumferential direction. In this embodiment, the planetary carrier 61A is provided with a press-fit hole 61Ac at a position corresponding to the gear rotation shaft 61Aa, and the gear rotation shaft 61Aa made of metal is press-fitted into the press-fit hole 61Ac and fixed. Yes.

  The gear rotation shaft 61Aa is a bulging portion 61Aaa that passes through the support hole 59Ab of the planetary gear 59A and has a tip projecting in a convex curved shape toward the case body 13 side. The bulging portion 49 abuts against the end wall portion 17 of the case body 13A at the same time as positioning of the planetary gear 59A in the rotational axis direction so as to position the planet carrier 61A with respect to the case 7A side.

  The cap portion 65 </ b> A is a plate made of metal, and is attached to the opening of the gear housing cylinder portion 75. Specifically, a male screw portion 65Aaa is provided on the outer periphery of the cap peripheral wall portion 65Aa of the cap portion 65A, and a female screw portion 75a is provided on the inner periphery of the opening of the gear housing cylinder portion 75. The cap portion 65A is screwed into the opening of the gear housing cylinder portion 75 by the male screw portion 65Aaa and the female screw portion 75a.

  An annular convex portion 65Aab is provided adjacent to the male screw portion 65Aaa on the cap peripheral wall portion 65Aa of the cap portion 65A. The annular convex portion 65 </ b> Aab is in contact with the opening edge of the gear housing cylinder portion 75.

  The cap end wall portion 65Ab of the cap portion 65A is formed so that the outer peripheral side is thicker than the inner peripheral side using the stepped shape of the planet carrier 61A. The cap end wall portion 65Ab is attached to the fixed side or the movable side to the thick portion. In this embodiment, the cap end wall portion 65Ab is provided with a female thread portion 65Abb for fastening.

  A shaft support portion 65Aba of the second rotation shaft 63A is provided on the inner peripheral portion of the cap portion 65A, and the shaft support portion 65Aba passes through the second rotation shaft 63A via a bearing 73A and supports it rotatably. Accordingly, the shaft support portion 65Aba positions the planet carrier 61A in the direction of the rotation axis on the opposite side to the case 7 via the second rotation shaft 63A.

  Therefore, the cap portion 65A positions the planet carrier 61A in the direction of the rotation axis between the cap portion 65A and the end wall portion 17A of the case 7A.

  In this embodiment, the planetary gear mechanism 5A can be housed in the gear housing support portion 75 extending from the case body 13, so that the rotary damper 1 can be easily handled and the structure can be made more compact. it can.

  In the present embodiment, the planetary gear mechanism 5A is covered and the planetary carrier 61A and the planetary gear 59A supported by the planetary gear mechanism 5A are covered only by attaching the cap 65A of the planetary gear mechanism 5A to the gear housing support 75. Can be positioned.

  In addition, the same effects as those of the first embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1 Rotation damper 5 Planetary gear mechanism 7 Case 9 Rotating body 11 Electromagnet (magnet) 17 End wall part 19 Supporting cylinder part 21 Boss part 25 Hole part 33 1st rotating shaft 51 Electromagnetic coil 55 Internal gear 57 Sun gear 59 Planet Gear 61 Planetary carrier 63 Second rotating shaft 65 Cap portion 75 Gear housing tube portion

Claims (7)

A magnetic case,
A rotating body made of a magnetic material disposed so as to be relatively rotatable in the case;
A working fluid that is housed in the case and increases in viscosity by passing magnetic flux between the case and the rotating body;
A magnet for generating the magnetic flux;
A first rotating shaft drawn out of the case from the rotating body;
A planetary gear mechanism coupled to the first rotation shaft outside the case;
A rotary damper characterized by comprising: The rotary damper according to claim 1,
The planetary gear mechanism is
An internal gear provided integrally rotatable with the case;
A sun gear provided on the first rotating shaft so as to be integrally rotatable;
A planetary gear interposed between the internal gear and the sun gear;
A planet carrier supporting the planetary gear;
A second rotating shaft provided on the planet carrier so as to be integrally rotatable;
A rotary damper characterized by comprising: The rotary damper according to claim 2,
The case is provided with an end wall portion located on the planetary gear mechanism side in the direction of the rotation axis of the first rotation shaft, and provided through the end wall portion to rotatably support the first rotation shaft. The drawer hole portion positioned in the radial direction, and a boss portion provided around the hole portion outside the case with respect to the end wall portion,
The internal gear is an annular member attached to the case, and is positioned in the radial direction by the boss portion of the case.
Rotating damper characterized by that. The rotary damper according to claim 2,
The case is provided with an end wall portion located on the planetary gear mechanism side in the direction of the rotation axis of the first rotation shaft, and provided through the end wall portion to rotatably support the first rotation shaft. The drawer hole portion positioned in the radial direction, and a support tube portion provided around the hole portion in the case with respect to the end wall portion;
The magnet is an electromagnet having an electromagnetic coil supported on the outer periphery of the support cylinder part, and having the support cylinder part and the end wall part as a yoke,
The internal gear is an annular member attached to the case, and is fixed to the end wall portion of the case.
Rotating damper characterized by that. The rotary damper according to claim 3 or 4,
A mounting plate supported between the end wall and the internal gear;
Rotating damper characterized by that. The rotary damper according to claim 2,
The case includes an end wall portion located on the planetary gear mechanism side in the rotation axis direction of the first rotation shaft, and a gear that protrudes in the rotation axis direction relative to the end wall portion and accommodates the planetary gear mechanism. A storage cylinder,
The internal gear is provided integrally with the gear housing cylinder.
Rotating damper characterized by that. The rotary damper according to claim 6, wherein
The planetary gear mechanism includes a cap portion that is attached to an opening portion of the gear housing cylinder portion and positions the planet carrier in the direction of the rotation axis with respect to an end wall portion of the case.
Rotating damper characterized by that.

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