JP2005164013A - Rotary damper device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary damper device capable of attenuating rotation force of a rotary shaft effectively even when the rotation force of the rotary shaft is strong. <P>SOLUTION: The rotary damper device 100 is provided with a casing 1 having the rotary shaft S, a magnetic fluid 2 sealed in an inside of the casing 1, a magnet 3 for magnetizing the magnetic fluid 2, and a protruded and recessed member 4 arranged between the rotary shaft S and the casing 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rotary damper device. More specifically, the present invention belongs to the technical field of rotary damper devices used in various machine tools, furniture opening / closing structures, gondola and the like.

  Conventionally, as a rotary damper device, for example, those described below are known. In Patent Document 1, a rotating shaft provided with an eccentric body, a container into which the rotating shaft is inserted, a magnetic fluid sealed inside the container, and provided at a specific position outside the container, A rotary damper device comprising a magnet to be magnetized is described.

In the rotary damper device according to Patent Document 1, since the viscosity of the magnetic fluid magnetized by the magnet provided at a specific position outside the container is increased, the function of damping the rotational force of the eccentric rotating shaft is enhanced. However, the rotary damper device has a problem in that when the rotational force of the rotational shaft is strong, the rotational shaft and the magnetic fluid rotate together, and thus the rotational force of the rotational shaft cannot be effectively attenuated. .
In addition, since the lines of magnetic force are not densely formed in the magnetic fluid, there is a problem that the viscosity of the magnetic fluid is not sufficiently increased and the rotational force cannot be effectively attenuated.

JP-A-7-301271

  Accordingly, an object of the present invention is to provide a rotating damper device that can effectively attenuate the rotating force of the rotating shaft even when the rotating force of the rotating shaft is strong.

  In order to solve the above-described problems, the rotary damper device according to the present invention employs means described in each of the claims.

  That is, the rotary damper device according to the present invention includes a casing provided with a rotating shaft, a magnetic fluid enclosed in the casing, a magnet for magnetizing the magnetic fluid, and the rotating shaft and the casing. And a concavo-convex member provided therebetween.

  According to the above configuration, the magnetic fluid magnetized by the magnet and improved in viscosity becomes a resistance with respect to the rotation direction of the rotation shaft. This resistance force effectively acts on the uneven member provided between the rotating shaft and the casing, and the rotating force of the rotating shaft is attenuated.

  According to a second aspect of the present invention, in the rotary damper device according to the first aspect, the concavo-convex member is provided on the periphery of the rotation shaft.

  According to the said structure, the resistance force of a magnetic fluid acts reliably with respect to the uneven | corrugated member provided in the periphery of a rotating shaft, and the rotating force of a rotating shaft attenuate | damps directly.

According to a third aspect of the present invention, in the rotary damper device according to the second aspect of the present invention, a magnet is provided in the casing, and the magnet is provided so that a distance from the inside of the casing is shortened along a rotation direction of the rotary shaft. Features.
According to a fourth aspect of the present invention, in the rotary damper device according to the third aspect, the casing is provided with a plurality of magnets so that the distance between the plurality of magnets and the inside of the casing sequentially decreases along the rotation direction of the rotating shaft. It is provided.

  According to the above configuration, it is possible to gradually cause the resistance force due to the magnetic fluid having improved viscosity to act on the rotating shaft.

  According to a fifth aspect of the present invention, in the rotary damper device according to any one of the second to fourth aspects, the uneven member is further provided on the inner periphery of the casing.

  According to the above configuration, the sliding of the magnetic fluid with respect to the casing is reliably prevented, and the rotating shaft and the magnetic fluid do not rotate together. Further, the resistance force to the rotating shaft is further increased, and the rotating force of the rotating shaft can be attenuated more effectively.

  According to a sixth aspect of the present invention, there is provided the rotary damper device according to the sixth aspect, wherein a casing provided with a rotating shaft, a magnetic fluid sealed in the casing, an insertion hole provided in the casing for entering and exiting the magnet, A magnet to be inserted into the insertion hole and a concavo-convex member provided on the periphery of the rotating shaft.

  According to the said structure, the resistance force of a magnetic fluid acts reliably with respect to the uneven | corrugated member provided in the periphery of a rotating shaft, and the rotating force of a rotating shaft attenuate | damps directly. Further, the magnet inserted into the insertion hole acts as a concavo-convex member, and the slip of the magnetic fluid relative to the casing is reliably prevented, so that the rotating shaft and the magnetic fluid do not rotate together.

  According to a seventh aspect of the present invention, there is provided the rotary damper device according to the seventh aspect, wherein the rotary shaft is provided with a casing provided with a rotating shaft, a magnetic fluid enclosed in the casing, a magnet for magnetizing the magnetic fluid, and a recessed portion on the rotating shaft. The plurality of vane grooves are provided with vanes provided so as to be in contact with the inner circumference of the casing, and a spare chamber communicating with the inside of the casing so that the magnetic fluid can move.

  According to the said structure, since the vane is always in contact with the inner periphery with a casing, all the resistance forces which arise with a magnetic fluid act with respect to the rotational force of a rotating shaft.

  According to an eighth aspect of the present invention, in the rotary damper device according to the seventh aspect, the vane is made of a magnet.

  According to the above configuration, the magnetic fluid in the vicinity of the vane is magnetized and the viscosity is improved. Thereby, it can prevent that a magnetic fluid moves via between a casing inner periphery and a vane.

  According to a ninth aspect of the present invention, there is provided the rotary damper device according to the ninth aspect, wherein a casing provided with a rotating shaft, a magnetic body provided on the rotating shaft, a magnetic fluid sealed inside the casing, and provided outside the casing. A magnet that can be brought close to the magnetic body.

  According to the said structure, a strong magnetic force line is formed in the magnetic fluid between a magnet and a magnetic body. For this reason, the magnetic fluid generates a strong frictional resistance against the rotational force of the rotating shaft.

  According to a tenth aspect of the present invention, in the rotary damper device according to any one of the first to ninth aspects, the magnetic fluid is a magnetorheological fluid.

  According to the above configuration, the magnetorheological fluid has a large improvement in the viscosity with respect to the magnetic force among the magnetorheological fluids, so that the rotational force of the rotating shaft can be attenuated more effectively.

As described above, according to the rotary damper device according to the present invention, since the concavo-convex member is provided between the rotary shaft and the casing, the resistance force of the magnetic fluid magnetized by the magnet and improved in viscosity is against the rotational force of the rotary shaft. Therefore, even when the rotational force of the rotating shaft is strong, it is possible to effectively attenuate.
Further, according to the rotary damper device according to the present invention, since the vane is provided so as to be in contact with the inner periphery with the casing, all the resistance force generated by the magnetic fluid acts on the rotational force of the rotary shaft. For this reason, it is possible to exert a strong damping action on the rotational force of the rotating shaft.

  The best mode for carrying out a rotary damper device according to the present invention will be described below with reference to the drawings.

  The best mode (1) for implementing the rotary damper device according to the present invention is shown in FIGS.

  As shown in FIG. 1, a rotary damper device 100 according to the best mode (1) for carrying out includes a casing 1 provided around a rotating shaft S, a magnetic fluid 2 enclosed in the casing 1, The magnet 3 is configured to magnetize the magnetic fluid, and the concavo-convex member 4 is fixed to the rotating shaft S so as to rotate integrally.

  As shown in FIGS. 1 and 2, the casing 1 has end wall members 12 and 13 laminated on both ends of a peripheral wall member 11 and tightened and integrated with bolts 14. A storage chamber 15 in which the fluid 2 is enclosed is provided.

  As a material of the casing 1, it is preferable to use a non-magnetic material such as aluminum (AL), stainless steel (SUS), brass (BS) or the like. When a non-magnetic material is used, the magnetic force lines generated by the magnet 3 reach the magnetic fluid 2 without being disturbed by the casing 1. On the other hand, when a magnetic material is used, the magnetic lines of force generated by the magnet 3 converge in the casing 1, so that the magnetic force of the magnet 3 exerted on the magnetic fluid 2 is reduced.

  The magnetic fluid 2 is enclosed in a gap between the inner periphery of the casing 1 and the surface of the concavo-convex member 4. The magnetic fluid 2 is composed of magnetic particles, a dispersion medium, and a dispersant, and the viscosity resistance increases by applying a magnetic force. The viscosity improvement of the magnetic fluid 2 by magnetic force occurs as follows. A magnetic force is applied to the magnetic particles dispersed in the magnetic fluid 2 by the magnetic field formed by the magnet 3 to form a chain cluster structure. And the viscosity of the magnetic fluid 2 rises by the magnetic particle which formed the chain | strand-shaped cluster structure and was made rigid. Conversely, when the application of the magnetic field by the magnet 3 is stopped, the cluster structure of the particles collapses, and the viscosity of the magnetic fluid 2 returns to the original state.

  Any magnetic fluid 2 may be used as long as it is magnetized by a magnet and the viscosity is improved. However, it is preferable to use a magnetorheological fluid. Magneto-Rheological Fluid (MRF) has a feature that the viscosity increases with respect to the application of a magnetic field and the viscosity can be controlled by the magnitude of the magnetic force as compared with a general magnetic fluid.

  As the magnetic particles constituting the magnetorheological fluid, pure iron, iron-cobalt alloy, iron-nickel alloy can be used, and can be appropriately selected in consideration of the use of the rotary damper device, the load on the rotary shaft, and the like. Further, the size of the magnetic particles is preferably 0.01 to 100 μm. When it is 0.01 μm or less, it is difficult to form a chain cluster structure, and when it is 100 μm or more, precipitation of magnetic particles tends to occur. Furthermore, the shape of the magnetic particles is preferably a spherical shape.

  As the dispersion medium constituting the magnetorheological fluid, it is preferable to use silicon oil, kerosene, synthetic oil or the like that is excellent in environmental stability, nonflammability, temperature stability, low viscosity characteristics, and the like.

  Furthermore, as the dispersant constituting the magnetorheological fluid, it is preferable to use a dispersant that has excellent aggregation stability that prevents the magnetic particles from sticking to each other and sedimentation stability that prevents the magnetic particles from precipitating with time.

  The magnet 3 is formed in a cylindrical shape and is provided in the casing 1 so as to be close to the storage chamber 15. And as shown to FIG. 3 (A), the two magnets 3 are arrange | positioned so that the distance with the storage chamber 15 may become short in order along the rotation direction of a rotating shaft.

  The type of the magnet 3 is not particularly limited as long as a magnetic force is applied to the magnetic fluid 2, and various permanent magnets such as alnico, ferrite, rare earth magnet, or electromagnets can be used. From the viewpoint of simplifying the apparatus, it is preferable to use a permanent magnet. When an electromagnet is used, the magnetic force can be changed by changing the current applied to the electromagnet, and the viscosity of the magnetic fluid can be controlled.

  As shown in FIG. 2, the concavo-convex member 4 extends in the axial direction by protruding from the boss 41 provided at the portion where the rotating shaft S is inserted into the casing 1 and at an angle of 120 degrees from the boss 41 at three positions. And teeth 42.

  The material of the concavo-convex member 4 is preferably a ferromagnetic material such as iron, cobalt, or nickel. The concavo-convex member 4 made of a ferromagnetic material converges the lines of magnetic force generated by the magnet 3 between the magnet 3 and the concavo-convex member 4 to increase the magnetic flux density in the region. Thereby, the viscosity of the magnetic fluid 2 existing in the region can be further improved.

  According to the best mode (1) for carrying out, when the rotating shaft S rotates, the concavo-convex member 4 fixed to the rotating shaft S integrally with the rotating shaft S rotates with it. When the concavo-convex member 4 rotates and the teeth 42 reach the vicinity of the magnet 3, the magnetic fluid 2 magnetized by the magnet 3 and having an improved viscosity generates a resistance force Fb against the rotational force Fa of the rotating shaft S. To do. As a result, the rotational force Fa of the rotating shaft S is attenuated as shown in FIGS. At this time, the resistance force Fb surely acts on the teeth 42 of the concavo-convex member 4 provided on the rotation shaft S, so that the rotation force Fa is more effectively attenuated.

  In addition, since the two magnets 3 are arranged in such a manner that the distance between the magnet 3 and the storage chamber 15 becomes shorter with respect to the rotation direction of the rotation shaft, the viscosity of the magnetic fluid 2 is directed toward the rotation direction of the rotation shaft. Gradually improve. Accordingly, the resistance force of the magnetic fluid 2 can be gradually applied to the rotational force of the rotational shaft S, and no unnecessary impact is applied to the rotational shaft S when the rotational force of the rotational shaft S is attenuated. .

  Next, the best mode (2) for carrying out the rotary damper device according to the present invention is shown in FIG.

  As shown in FIG. 4, in the best mode (2) for carrying out, in the best mode (1) for carrying out, teeth 43 are provided as concave and convex members on the inner periphery of the casing 1. Further, the magnet 3 formed in a columnar shape is provided in the vicinity of the base of the tooth 42 of the concavo-convex member 4 provided on the periphery of the rotation axis S.

  The configuration of the casing 1 can be performed in the same manner as the best mode (1) for carrying out. Various materials can be applied as the material of the casing 1, but in order to increase the magnetic force applied to the magnetic fluid 2, it is preferable to use a ferromagnetic material such as iron, cobalt, or nickel.

  Moreover, about the kind of the magnetic fluid 2 and the magnet 3, it can carry out similarly to the best form (1) for implementing.

  Furthermore, the uneven member 4 is provided with an insertion hole for inserting the magnet 3. Other configurations can be performed in the same manner as the best mode (1) for carrying out. As the material of the concavo-convex member 4, it is preferable to use a non-magnetic material. When a nonmagnetic material is used, the lines of magnetic force generated by the magnet 3 reach the magnetic fluid 2 without being disturbed by the uneven member 4.

  According to the best mode (2) for carrying out, since the concavo-convex member 4 is provided on the casing 1 side, the sliding of the magnetic fluid 2 with respect to the casing 1 side is surely prevented, and the rotating shaft S and the magnetic fluid are both prevented. There is no turning. Further, since the teeth 43 of the concavo-convex member 4 are provided, the teeth 42 rotate and approach the teeth 43, and the magnetic fluid between the teeth 42, 43 is compressed. As a result, the resistance force to the rotating shaft increases, and in combination with the high viscosity of the magnetic fluid, the rotating force of the rotating shaft can be more effectively attenuated. About the other effect | action, it is show | played similarly to the best form (1) for implementing.

  In the best modes (1) and (2) for carrying out the above, the casing 1 is formed by laminating end wall members 12 and 13 on both ends of the peripheral wall member 11 and fastening and integrating them with bolts 14. There is no particular limitation as long as the rotating shaft S can be inserted and the magnetic fluid can be sealed.

  Further, the position, shape, number, and the like of the magnets 3 are not particularly limited as long as the magnetic lines of force are set in the magnetic fluid 2. For example, in the best modes (1) and (2) for carrying out the position of the magnet 3, the case where the magnet 3 is provided on the casing 1 side and the rotating shaft S side has been described, but it is also possible to use both in combination. Further, it may be arranged outside the casing 1.

  Further, in the best modes (1) and (2) for implementing the above, the concavo-convex member 4 is provided so as to be integrally rotated with the rotary shaft S, but is provided on the rotary shaft S via a one-way clutch. It is also possible. When the concavo-convex member 4 is provided via a one-way clutch, the concavo-convex member 4 rotates with the rotating shaft S only in one direction with the rotating shaft S, but does not rotate when the rotating shaft S rotates in the opposite direction. Further, the teeth 42 and the teeth 43 constituting the concavo-convex member 4 are provided at three positions through an angle of 120 degrees, but can be appropriately set according to the use of the rotary damper device.

  Further, the rotation shaft S is inserted at the center of the casing 1 in the best modes (1) and (2) for implementing the above, but may be inserted at an eccentric position.

  Next, the best mode (3) for carrying out the rotary damper device according to the present invention is shown in FIGS.

  In the best mode (3) for carrying out, the casing 1 provided with the rotating shaft S1, the magnetic fluid 2 enclosed in the casing 1, and the magnet provided in the casing 1 are inserted. An insertion hole 16, a magnet 3 to be inserted into the insertion hole 16, and teeth 52 provided on the periphery of the rotating shaft are provided.

  As shown in FIGS. 5 and 6, the casing 1 has end wall members 12, 13 laminated on both ends of the peripheral wall member 11 and tightened and integrated with bolts 14. A storage chamber 15 in which the fluid 2 is enclosed is provided. The peripheral wall member 11 of the casing 1 is provided with an insertion hole 16 for inserting the magnet 3. As the material of the casing 1, various materials can be applied, but in order to increase the magnetic force applied to the magnetic fluid 2, a nonmagnetic material such as aluminum (AL), stainless steel (SUS), brass (BS), etc. Is preferably used.

  The magnetic fluid 2 is enclosed in the accommodation chamber 15 of the casing 1. In addition, about the magnetic fluid 2, it can carry out similarly to the best form (1) for implementing.

  The magnet 3 is inserted into an insertion hole 16 provided in the side wall 11 of the casing 1. About the kind of magnet 3, it can carry out similarly to the best form (1) for implementing.

  The rotating shaft S1 is inserted into the casing 1, and teeth 52 are provided as uneven portions on the periphery of the rotating shaft S1. It is preferable to use a ferromagnetic material such as iron, cobalt, or nickel as the material of the rotation shaft S1.

  According to the best mode (3) for carrying out, when the rotation shaft S1 rotates, the teeth 52 provided on the periphery of the rotation shaft S1 rotate along with it. When the teeth 52 rotate and reach the vicinity of the magnet 3, the magnetic fluid 2 magnetized by the magnet 3 and improved in viscosity generates a resistance force against the rotational force of the rotating rotation shaft S1. As a result, the rotational force of the rotating shaft S is attenuated. At this time, the resistance force Fb surely acts on the teeth 42 provided on the rotation shaft S1, so that the rotation force Fa is more effectively attenuated.

  Further, the magnet 3 inserted into the casing 1 acts as a concavo-convex portion, and the magnetic fluid 2 is reliably prevented from slipping with respect to the casing 1 side. Further, the teeth 42 rotate and approach the magnet 3, and the magnetic fluid 2 between the teeth 42 and the magnet 3 is compressed. As a result, the resistance force to the rotation shaft S2 increases, and it becomes possible to more effectively attenuate the rotation force of the rotation shaft combined with the high viscosity of the magnetic fluid.

  Since the magnet 3 can be freely inserted and pulled out, the rotational force of the rotation shaft S1 can be attenuated at an arbitrary rotation angle.

  Next, FIG. 7 shows the best mode (4) for carrying out the rotary damper device according to the present invention.

  As shown in FIG. 7, the best mode (4) for carrying out is characterized in that, in the best mode (3) for carrying out, the rotation axis S1 is a magnet.

  According to the best mode (4) for carrying out, strong lines of magnetic force are formed between the magnet 3 inserted into the casing 1 and the rotation shaft S1 made of the magnet. Thereby, the resistance force to the rotating shaft increases, and the rotating force of the rotating shaft can be attenuated more effectively. About another structure, it applies to the best form (3) for implementing.

  In the best mode (4) for carrying out, since the tooth 52 is provided as the concavo-convex member on the rotating shaft S1, the resistance force by the magnetic fluid acts on the rotating force of the rotating shaft with certainty. In the best mode (4) for carrying out, a strong magnetic force line is formed between the magnet 3 and the rotating shaft S1 made of the magnet, and a strong damping action acts on the rotating force of the rotating shaft S1. It is not necessary to provide an uneven member such as the tooth 52.

  Next, the best mode (5) for carrying out the rotary damper device according to the present invention is shown in FIGS.

  As shown in FIG. 8, the rotary damper device 102 according to the best mode (5) for carrying out includes a casing 1 provided with a rotation shaft S2, a magnetic fluid 2 sealed inside the casing 1, and a magnetic A magnet 3 for magnetizing the fluid 2, a vane groove 50 provided through the rotation shaft S2, a vane 44 provided so as to be always in contact with the inner periphery of the casing 1, and the vane 44 directed toward the inner periphery of the casing. It is formed by a spring 45 that is urged by pressure and a spare chamber 15b that communicates with the inside of the casing 1 so that the magnetic fluid 2 can move according to the volume change inside the casing 1 divided by the vane 44.

  As shown in FIG. 8, the storage chamber 15 of the casing 1 includes a main chamber 15a in which the rotation shaft S2 is stored, a spare chamber 15b that is separated from the main chamber 15a and faces the plate-shaped magnet 3, and a rotation shaft S. The communication chamber 15c communicates with the main chamber 15a at two positions through an angle in the rotation direction.

  The magnetic fluid 2 is enclosed in the accommodation chamber 15 of the casing 1. In addition, about the magnetic fluid 2, it can carry out similarly to the best form (1) for implementing.

  The magnet 3 is disposed so as to be close to the spare chamber 15b. About the kind of magnet 3, it can carry out similarly to the best form (1) for implementing.

  The rotation shaft S2 is inserted eccentrically inside the casing. Further, the rotation shaft S2 is provided with a vane groove 50 through which the vane 44 can be inserted so as to penetrate the rotation shaft S2.

  The vane 44 is inserted into the vane groove 50 provided in the rotation shaft S2. Between the two vanes 44, a spring 45 is provided as a biasing mechanism for the vanes 44. The springs 45 bias and bias the vanes 44 in the protruding direction. For this reason, the vane 44 is always in contact with the inner periphery of the casing 1 even when the rotation shaft S2 rotates. Further, the main chamber 15a inside the casing 1 is partitioned by the vane 44 into two chambers, a main chamber 15a ′ and a main chamber 15a ″.

  The vane 44 is preferably a magnet. When the vane 44 is a magnet, the magnetic fluid 2 near the vane 44 is magnetized and the viscosity is improved. Thereby, even when a gap is generated between the inner periphery of the casing 1 and the vane 44, the movement of the magnetic fluid 2 through the gap can be prevented.

  In this case, it is possible to more reliably prevent the magnetic fluid 2 from moving through the gap by selecting a ferromagnetic material such as iron, cobalt, nickel, etc. as the material of the main chamber 15a. That is, strong magnetic lines of force are formed in the gap between the inner periphery of the main chamber 15a and the vane 44, and the viscosity of the magnetic fluid 2 in the region is further improved, so that leakage is more reliably prevented. .

  According to the best mode (5) for carrying out, when the rotation shaft S2 rotates, the vane 44 provided on the rotation shaft S2 rotates integrally therewith. The vane 44 rotates so as to be always in contact with the inner periphery of the casing, whereby the magnetic fluid 2 in the main chamber 15a ′ is pushed out to the main chamber 15a ″ through the spare chamber 15b and the communication chamber 15c. Thus, the viscosity of the magnetic fluid 2 in the preliminary chamber 15c is improved by the magnet 3 installed in this way, so that the magnetic fluid having a high viscosity in the preliminary chamber 15c has a resistance force Fb against the rotational force Fa of the rotary shaft S2. In this case, since the vane 44 is always in contact with the inner periphery of the casing 1, the resistance force Fb generated by the magnetic fluid 2 in the spare chamber 15b is all rotated by the rotating shaft S2. Acts on the force Fa.

  In the best mode (5) for carrying out the above, the magnet 3 is arranged so as to be close to the spare chamber 15b. However, if magnetic field lines are formed in the magnetic fluid 2 in the spare chamber 15b. For example, the position, shape, number, etc. are not particularly limited.

  Furthermore, although the spring 45 is used as a member constituting the vane 44, it is not particularly limited as long as it has elasticity. For example, rubber, titanium alloy or the like can be used.

  Next, the best mode (6) for carrying out the rotary damper device according to the present invention is shown in FIGS.

  In the best mode (6) for carrying out, the casing 1 in which the rotating shaft S3 is provided, the magnetic fluid 2 enclosed in the casing 1, the magnet 3 for magnetizing the magnetic fluid 2, and the rotating shaft And a magnetic body inserted in S3.

  The configuration of the casing 1 can be performed in the same manner as the best mode (1) for carrying out. As a material of the casing 1, it is preferable to use a non-magnetic material such as aluminum (AL), stainless steel (SUS), brass (BS) or the like.

  Moreover, about the kind of the magnetic fluid 2 and the magnet 3, it can carry out similarly to the best form (1) for implementing.

  The rotation shaft S3 is inserted into the casing 1, and is provided with an insertion hole 54 for inserting the magnetic body 53. It is preferable to use a non-magnetic material for the material of the rotating shaft S3.

  According to the best mode for carrying out (6), when the rotation shaft S3 rotates, the magnetic body 53 inserted through the rotation shaft S2 approaches the magnet 3 and becomes a magnetic fluid 2 between the magnetic body 53 and the magnet 3. Strong magnetic field lines are formed. As a result, the magnetic fluid 2 has a high viscosity and generates a strong frictional resistance against the rotational force of the rotating rotating shaft S3. As a result, the rotational force of the rotation shaft S3 is effectively attenuated.

It is a partially transparent perspective view which shows the best form (1) for implementing the rotary damper apparatus which concerns on this invention. It is AA sectional drawing of FIG. (A) It is an expanded sectional view of the principal part of FIG. (B), (C) It is the best form (1) for implementing the rotary damper apparatus which concerns on this invention, and is sectional drawing showing the damping mechanism of the rotational force of a rotating shaft. It is sectional drawing which shows the best form (2) for implementing the rotary damper apparatus which concerns on this invention. It is a partially transparent perspective view which shows the best form (3) for implementing the rotary damper apparatus which concerns on this invention. It is BB sectional drawing of FIG. It is sectional drawing which shows the best form (4) for implementing the rotary damper apparatus which concerns on this invention. It is a partially transparent perspective view which shows the best form (5) for implementing the rotary damper apparatus which concerns on this invention. It is CC sectional drawing of FIG. It is a partially transparent perspective view which shows the best form (6) for implementing the rotary damper apparatus which concerns on this invention. It is DD sectional drawing of FIG. It is EE sectional drawing of FIG.

Explanation of symbols

100, 101, 102, 103 Rotary damper device 1 Casing 11 Peripheral wall material 12 End wall material 13 End wall material 14 Bolt 15 Storage chamber 15a Main chamber 15a 'Main chamber 15a "Main chamber 15b Preliminary chamber 15c Communication chamber 16 Insertion hole 2 Magnetic Fluid 3 Magnet 4 Irregular member 41 Boss 42 Teeth 43 Teeth 44 Vane 45 Spring 50 Vane grooves 51, 52 Teeth 53 Magnetic bodies S, S1, S2, S3 Rotating shaft

Claims (10)

  A rotary damper device comprising: a casing provided with a rotating shaft; a magnetic fluid enclosed in the casing; a magnet for magnetizing the magnetic fluid; and a concavo-convex member provided between the rotating shaft and the casing.   2. The rotary damper device according to claim 1, wherein the concavo-convex member is provided on the periphery of the rotary shaft.   3. The rotary damper device according to claim 2, wherein a magnet is provided in the casing, and the magnet is provided so that a distance from the inside of the casing is shortened along a rotation direction of the rotary shaft.   The rotary damper device according to claim 2, wherein a plurality of magnets are provided in the casing, and the plurality of magnets are provided so that a distance from the inside of the casing is sequentially shortened along a rotation direction of the rotation shaft. Rotating damper device.   The rotary damper device according to any one of claims 2 to 4, wherein an uneven member is further provided on an inner periphery of the casing.   A casing provided with a rotating shaft, a magnetic fluid sealed inside the casing, an insertion hole provided in the casing for entering and exiting a magnet, a magnet inserted into the insertion hole, and a peripheral edge of the rotating shaft A rotary damper device comprising the uneven member.   A casing provided with a rotating shaft, a magnetic fluid sealed in the casing, a magnet for magnetizing the magnetic fluid, and a vane groove provided in the rotating shaft are provided in contact with the inner periphery of the casing. A rotary damper device comprising a vane and a spare chamber communicating with the inside of the casing so that the magnetic fluid can move.   8. The rotary damper device according to claim 7, wherein the vane is made of a magnet.   A rotary damper device comprising: a casing provided with a rotating shaft; a magnetic body provided on the rotating shaft; a magnetic fluid sealed inside the casing; and a magnet provided outside the casing and brought close to the magnetic body.   The rotary damper device according to any one of claims 1 to 9, wherein the magnetic fluid is a magnetorheological fluid.

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