JP4733430B2 - Viscous fluid filled damper and vibration damping device - Google Patents

Description

  The present invention relates to a disk-shaped recording medium (hereinafter referred to as “disk”) such as a hard disk drive (HDD) or a compact disk (CD) used for audio equipment, video equipment, information equipment, etc. for in-vehicle use and consumer use. The present invention relates to a vibration damping technique for a disk device that reproduces information recorded on the disk. In particular, the present invention relates to a viscous fluid-filled damper and a vibration damping device for damping vibrations of a mechanical chassis on which a disk reproducing mechanism is mounted.

  A disk device is a precision device that records or reproduces information on a disk by bringing a magnetic head or an optical pickup close to the disk that rotates at high speed by a motor. Therefore, it is vulnerable to internal vibration caused by rotation of the eccentric disk and external vibration transmitted from the outside of the device, and it is necessary to prevent malfunction caused by them. Therefore, it is usual to dampen the vibration of the mechanical chassis by interposing a viscous fluid-filled damper between the mechanical chassis on which the disk reproducing mechanism is mounted and the housing.

  For example, as shown in FIG. 15, the viscous fluid-filled damper 1 according to the conventional example has a flexible portion 3 made of a rubber-like elastic body constituting the sealed container 2 made of resin or metal provided in the mechanical chassis 4. The lid 6 constituting the hermetic container 2 is fixed to the casing 7 by the mounting screw N and is fixed between the mechanical chassis 4 and the casing 7. It is done. On the other hand, the other end of a suspension spring 8 having one end attached to the housing 7 is attached to the mechanical chassis 4 and is supported in a floating state inside the housing 7. As described above, in the conventional disk device 9, the mechanical chassis 4 is elastically supported in a floating state inside the housing 7 by using the viscous fluid-filled damper 1 and the suspension spring 8 together (Patent Document 1). .

  The specific configuration of the viscous fluid-filled damper 1 is such that a viscous fluid 10 such as silicone oil is sealed inside the sealed container 2 as shown in FIG. The sealed container 2 has one end side of a cylindrical peripheral wall portion 11 made of hard resin sealed with a dome-like flexible portion 3 made of a rubber-like elastic body, and the other end side with a flange made of hard resin. It is configured by being sealed with a plate-like lid portion 6. At the center of the top of the flexible part 3, a bottomed cylindrical stirring cylinder part 12 protruding into the inside of the sealed container 2 is formed. Since the receiving recess 13 of the stirring cylinder portion 12 receives the engaging head 5a of the mounting shaft 5, the bottom 13a side has a relative shape with the engaging head 5a of the mounting shaft 5 so that the mounting shaft 5 is difficult to come off. .

  The vibration damping effect of the viscous fluid-filled damper 1 is such that when vibration is applied to the disk device 9, the stirring cylinder portion 12 integrated with the mounting shaft 5 inserted into the housing recess 13 is interlocked vertically and horizontally so that the inside of the sealed container 2 is It is exhibited by viscous resistance generated by stirring the viscous fluid 10 enclosed in the container.

  However, in the conventional viscous fluid-filled damper 1, it is difficult to insert the mounting shaft 5 into the housing recess 13, and is the engagement head 5 a of the mounting shaft 5 inserted sufficiently inside the housing recess 13? It is difficult to confirm whether or not. Further, as shown in FIG. 17, when the inner peripheral surface of the mounting shaft 5 moves greatly in the direction of the arrow, the mounting shaft 5 slides in the housing recess 13, and the mounting shaft 5 and the inner peripheral surface 13 b of the housing recess 13 Due to the friction, the stirring tube portion 12 may be broken or the mounting shaft 5 may come out of the housing recess 3.

Therefore, in order to avoid the above-described problems, the entire inner peripheral surface 13b of the accommodating recess 13 at the center of the flexible portion 3 is made of a hard resin like the viscous fluid-filled damper 14 shown as the second conventional example in FIG. A technique has been proposed in which the mounting shaft 5 is integrally formed by two-color molding so that the mounting shaft 5 does not come off (Patent Document 2).
JP 2002-242977 A JP 2003-139182 A

  The viscous fluid-filled damper 14 according to the second conventional example is sealed with the viscous fluid according to the first conventional example shown in FIG. 17 even when the mounting shaft 5 moves greatly in the direction of the arrow as shown in FIG. As with the damper 1, the attachment shaft 5 does not slide or come off in the housing recess 13. However, when the stirring tube portion 12 is pulled by the received vibration, the thickness of the flexible portion 3 around the opening end 13c side of the housing recess 13 is compared with the thickness of the stirring tube portion 12 on the opening end 13c side of the housing recess 13. There is a risk of breaking in particular at the thinly stretched portion.

  The present invention has been made against the background of the prior art as described above. That is, according to the present invention, the attachment shaft is not pulled out, the inner peripheral surface of the housing recess and the flexible portion around the opening end side of the housing recess do not break, and the viscous fluid is sealed so that a sufficient vibration damping effect can be obtained. The object is to provide a damper and a vibration damping device.

  And this invention which achieves the said objective is comprised as follows.

  That is, the present invention has an agitating tube portion in which an accommodation recess is formed, and is supported by projecting to the outside from a sealed container enclosing a viscous fluid therein, a shaft portion accommodated in the accommodation recess, and an opening end of the accommodation recess. An attachment shaft formed with an attachment portion attached to either the body or the supported body, and the vibration of the support or the supported body is caused by the viscous resistance of the viscous fluid stirred by the stirring cylinder portion. For the damper containing the viscous fluid to be damped, a joining portion is provided on the bottom side of the stirring cylinder portion and the tip end side of the shaft portion, and the inner peripheral surface on the opening end side of the housing recess and the outer peripheral surface of the shaft portion can be contacted and separated. Provided is a viscous fluid-filled damper characterized by being an unconstrained portion.

In this invention, the junction part is provided in the bottom part side of the stirring cylinder part, and the front end side of the axial part. For this reason, the mounting shaft does not slip or come off in the housing recess.
Further, in the present invention, the inner peripheral surface on the opening end side of the housing recess and the outer peripheral surface of the shaft portion are set as non-restraint portions that can be contacted and separated. For this reason, even when large amplitude vibration is applied in the axial direction, the stirring cylinder portion on the opening end side of the housing recess is flexibly deformed in the unconstrained portion, and the thickness of the flexible portion around the opening end side of the housing recess is However, it is not stretched thinly compared with the thickness of the stirring tube portion on the opening end side of the housing recess. Therefore, the flexible part is not broken.

  In the viscous fluid-filled damper, the present invention provides a hard resin portion at a position facing the front end surface of the mounting shaft at the bottom of the stirring cylinder portion, and the front end surface of the mounting shaft and the hard resin portion serve as the joint portion. It is joined.

  In the present invention, a hard resin portion is provided at a position facing the tip end surface of the mounting shaft at the bottom of the stirring tube portion, and the tip end surface of the mounting shaft and the hard resin portion are joined as the joining portion. For this reason, a joined part becomes joining between hard members, and it can raise joint strength of the bottom part of a stirring cylinder part and the tip of an attachment shaft. For this reason, even if the area of the joining portion is small, sufficient joining strength can be obtained.

  In the viscous fluid-filled damper according to the present invention, the bottom portion of the stirring tube portion is joined to the outer peripheral surface on the front end side of the mounting shaft as the joining portion.

  In the present invention, as the joining portion, the bottom portion of the stirring cylinder portion is joined to the outer peripheral surface on the front end side of the mounting shaft. For this reason, the region of the non-restraining portion that can be contacted and separated between the inner peripheral surface on the opening end side of the housing recess and the outer peripheral surface of the shaft portion in the depth direction of the housing recess of the stirring cylinder portion is maximized, and the opening end of the housing recess The side stirring tube portion can be deformed most flexibly. Therefore, the flexible part is not broken.

  In the viscous fluid-filled damper, the tip end side of the mounting shaft is joined to the bottom portion of the stirring cylinder portion in the buried state as the joining portion.

In the present invention, as the joining portion, the tip end side of the mounting shaft is joined to the bottom portion of the stirring cylinder portion in a buried state. For this reason, the area of a junction part becomes large and the joint strength of the bottom part of a stirring cylinder part and the front end side of an attachment shaft becomes high. Therefore, sufficient bonding strength can be obtained.
Moreover, according to this invention, it becomes a structure where a junction part does not contact a viscous fluid at all. For this reason, the viscous fluid does not leak outside through the stirring cylinder portion.

  In the viscous fluid-filled damper according to the present invention, a partition wall portion protruding in a direction intersecting the axis of the mounting shaft is formed between the shaft portion of the mounting shaft and the mounting portion.

  In this invention, the partition part which protrudes in the axis crossing direction of an attachment shaft is formed between the axial part of an attachment shaft, and an attachment part. For this reason, either the support body or the to-be-supported body which fixed the attaching part, and a sealed container are partitioned off by a partition part. Therefore, the sealed container does not come into contact with the support or the support and does not rub. Therefore, damage to the sealed container can be prevented.

  The present invention relates to the viscous fluid-filled damper, a rubber-like container that has a sealed container having a cylindrical peripheral wall part and the stirring cylinder part along the cylindrical axis direction of the peripheral wall part and closes one end side of the peripheral wall part It formed with the flexible part which consists of an elastic body, and the cover part which obstruct | occludes the other end side of this surrounding wall part.

  In the present invention, the airtight container includes a flexible portion made of a rubber-like elastic body that has a cylindrical peripheral wall portion and the stirring cylinder portion along the cylindrical axis direction of the peripheral wall portion and closes one end side of the peripheral wall portion. And a lid portion that closes the other end side of the peripheral wall portion. For this reason, the stirring cylinder part can stir the viscous fluid while the peripheral wall part maintains a predetermined cylindrical shape. Therefore, the vibration of the supported body can be sufficiently damped.

  In addition, the present invention is a vibration damping device including any one of the viscous fluid-sealed dampers according to the present invention, wherein a protruding portion that protrudes outward is provided on a mounting shaft and a sealed container of the viscous fluid-filled damper, respectively. A vibration damping device is provided in which a compression coil spring that supports the load of the supported body is provided between the protrusions concentrically with the viscous fluid-filled damper.

The present invention is a vibration damping device including any one of the viscous fluid-sealed dampers according to the present invention, wherein an outwardly projecting portion is provided on an attachment shaft and a sealed container of the viscous fluid-sealed damper, A compression coil spring that supports the load of the supported body is provided between the protrusions concentrically with the viscous fluid-filled damper. For this reason, the impact applied to the sealed container and the mounting shaft can be reduced. Therefore, it is possible to further eliminate the disconnection of the attachment shaft and the breakage of the flexible portion.
Moreover, in this invention, the viscous fluid enclosure damper and the compression coil spring are integrated, and can be handled as one component. For this reason, if it is this invention, it is not necessary to assemble | attach a separate spring like the suspension spring demonstrated by the prior art between a housing | casing and a mechanical chassis. Therefore, assembly to the disk device is easy, and the number of parts can be reduced.

  Furthermore, the present invention is a vibration damping device including any one of the viscous fluid-filled dampers according to the present invention, wherein one end side is fixed to the mounting shaft of the viscous fluid-filled damper and the other end side is fixed to the sealed container. Thus, a vibration damping device provided with a tension coil spring that suspends and supports a mounting shaft to which a load of the supported body is applied so that the stirring cylinder portion is not displaced by the load of the supported body is provided.

The present invention is a vibration damping device including any one of the viscous fluid-sealed dampers according to the present invention, wherein one end side is fixed to a mounting shaft of the viscous fluid-filled damper, and the other end side is fixed to a sealed container. A tension coil spring is provided to suspend and support the mounting shaft to which the load of the supported body is applied so that the stirring cylinder portion is not displaced by the load of the supported body. For this reason, the impact applied to the sealed container and the mounting shaft can be reduced. Therefore, it is possible to further eliminate the disconnection of the attachment shaft and the breakage of the flexible portion.
Further, in the present invention, the viscous fluid-filled damper and the tension coil spring are integrated and can be handled as one component. For this reason, if it is this invention, it is not necessary to assemble | attach a separate spring like the suspension spring demonstrated by the prior art between a housing | casing and a mechanical chassis. Therefore, assembly to the disk device is easy, and the number of parts can be reduced.

  According to the viscous fluid-filled damper of the present invention, the mounting shaft does not slip or come off in the housing recess, and the inner peripheral surface of the housing recess does not break. In addition, even when large amplitude vibration is applied in the axial direction, the stirring tube portion on the opening end side of the housing recess is deformed flexibly, and the thickness of the flexible portion around the opening end side of the housing recess is the opening of the housing recess. It is not stretched thinly compared to the thickness of the end side stirring tube portion. Therefore, it is possible to realize a high-quality viscous fluid-filled damper that does not break the flexible portion, has high durability and reliability, and provides a sufficient vibration damping effect.

  According to the vibration damping device of the present invention, since the compression coil spring and the tension coil spring are integrally provided, the impact applied to the sealed container and the mounting shaft can be reduced. For this reason, it is possible to realize a high-quality vibration damping device that can further eliminate the attachment shaft and break the flexible portion, have high durability and reliability, and obtain a sufficient vibration damping effect. Moreover, it is not necessary to assemble a separate spring. Therefore, assembly to the disk device is easy, the number of parts can be reduced, and a low-cost disk device that is easy to produce can be realized.

  Embodiments of the present invention will be described below with reference to the drawings. Note that, in each embodiment, redundant description of the same material, structure, and the like is omitted.

A. Viscous fluid filled damper embodiment

First Embodiment [FIGS. 1 to 3]
The viscous fluid-filled damper 15 of the present embodiment has a schematic configuration in which the viscous fluid 10 is sealed in the sealed container 2. The sealed container 2 includes a cylindrical peripheral wall portion 11 made of hard resin, a flexible portion 3 made of a rubber-like elastic body that closes the upper end opening of the peripheral wall portion 11 in the figure, and a lid that closes the lower end opening of the peripheral wall portion 11 in the figure. In addition to the part 6, the mounting shaft 5 is integrally provided.

  Of these, the flexible portion 3 is formed with a cylindrical stirring cylinder portion 12 with a bottom that protrudes into the closed container 2. The stirring cylinder portion 12 includes a cylindrical portion 12 a and a bottom portion 12 b, and an inner surface thereof serves as an accommodation recess 13 that accommodates the attachment shaft 5. A hard resin portion 12c is formed on the bottom portion 12b. The hard resin portion 12c in the present embodiment is formed by two-color molding with the flexible portion 3.

The mounting shaft 5 includes a rod-shaped shaft portion 5b accommodated in the accommodating recess 13 of the flexible portion 3, a circular partition wall portion 5c in plan view, and the elastic force of the pair of divided locking pieces. An attachment portion 5d that is fixed to the housing 7 (support body) or the mechanical chassis 4 (supported body) is formed.
Among these, the front-end | tip of the axial part 5b is being fixed with the hard resin part 12c in the bottom part 12b of the above-mentioned stirring cylinder part 12. FIG. That is, the fixed portion between the shaft portion 5 b and the hard resin portion 12 c forms the joint portion 16. For this reason, in this embodiment, the attachment shaft 5 and the stirring tube portion 12 are fixed (restrained) only at the joint portion 16, and are “unconstrained portions” that are not fixed (restrained) in other portions. Yes.
Both the shaft portion 5b and the housing recess 13 for housing the shaft portion 5b have the same diameter along the axial direction, and the cross-sectional area of the shaft portion 5b is smaller than that of the hard resin portion 12c. Therefore, if the shaft portion 5 b is aligned with the housing recess 13 and joined to the hard resin portion 12 c, a substantially concentric gap is formed between the shaft portion 5 b and the housing recess 13. For this reason, it is made for the shaft part 5b and the accommodation recessed part 13 not to rub as much as possible, and to prevent the accommodation recessed part 13 from being broken.
The length of the shaft portion 5b is such that the end of the shaft portion 5b is fixed to the hard resin portion 12c, and the opposite end portion protrudes from the upper end opening of the housing recess portion 13, and the partition wall portion 5c. Is formed at the protruding end. That is, a gap is formed between the partition wall portion 5c and the flexible portion 2 so that they hardly contact each other.
As described above, the attachment portion 5d is constituted by a pair of arrowhead-shaped locking pieces 5e divided into two. Each locking piece 5e is locked to the plate surface through locking holes 4a and 7a formed in the housing 7 (supporting body) or the mechanical chassis 4 (supported body). The distance between the step portion 5f that functions to be locked and the partition wall portion 5c that faces the step portion 5f is substantially the same as the plate thickness of the housing 7 or the mechanical chassis 4.

  Here, the material of each part of the viscous fluid-filled damper 15 of this embodiment will be described.

  The material of the “hard resin” constituting the peripheral wall portion 11 of the sealed container 2, the lid portion 6, and the hard resin portion 12 c of the stirring cylinder portion 12 is required for mechanical strength, heat resistance, durability, dimensional accuracy, reliability, and the like. Thermoplastic resins are preferred due to performance, weight reduction and processability. For example, polyethylene resin, polypropylene resin, polyvinyl chloride resin, polystyrene resin, acrylonitrile / styrene / acrylate resin, acrylonitrile / butadiene / styrene resin, polyamide resin, polyacetal resin, polycarbonate resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyphenylene oxide Examples thereof include thermoplastic resins such as resins, polyphenylene ether resins, polyphenylene sulfide resins, polyurethane resins, and liquid crystal polymers, or composite resins thereof. By adding a filler such as powdered or fibrous metal, glass, filler, etc. to the thermoplastic resin, the dimensional accuracy and heat resistance can be further improved.

  The material of the “rubber-like elastic body” constituting the flexible portion 3 is preferably a synthetic rubber or a thermoplastic elastomer having a damping effect. For example, synthetic rubber includes butyl rubber, styrene butadiene rubber, chloroprene rubber, nitrile rubber, urethane rubber, silicone rubber, fluorine rubber, acrylic rubber, and the like. , Urethane thermoplastic elastomers, vinyl chloride thermoplastic elastomers, and the like. In addition, when a thermoplastic resin is used for the hard resin and a thermoplastic elastomer is used for the rubber-like elastic body, two-color molding is possible.

  The material of the viscous fluid 10 is preferably a liquid or a liquid to which solid particles that do not react and dissolve in the liquid are added. Examples thereof include liquids such as silicone oils, paraffinic oils, ester oils, and liquid rubbers, or those obtained by adding solid particles that do not react and dissolve in these liquids. Of these, silicone-based oils are preferred as liquids due to required performance such as temperature dependency, heat resistance, and reliability. Specifically, dimethyl silicone oil, methyl phenyl silicone oil, methyl hydrogen silicone oil, fluorine-modified silicone are preferred. Examples of solid particles that react and do not dissolve in these silicone oils include silicone resin powder, polymethylsilsesquioxane powder, wet silica, dry silica, glass beads, glass balloons, etc., or surface treatment thereof. These are used alone or in combination.

  As the material of the mounting shaft 5, a metal such as a light metal such as aluminum or an alloy such as stainless steel, a thermoplastic resin, or a thermosetting resin can be used. In particular, from the viewpoint of required performance such as mechanical strength, heat resistance, durability, dimensional accuracy, reliability, and workability, metals and thermoplastic resins are preferable.

  Next, an example of a method for manufacturing the viscous fluid-filled damper 15 in this embodiment will be described.

  First, the peripheral wall part 11 and the flexible part 3 are molded in two colors. The flexible portion 3 including the peripheral wall portion 11 and the hard resin portion 12c is obtained by injection molding the flexible portion 3 after the peripheral wall portion 11 and the hard resin portion 12c are obtained by injection molding using a two-color molding die. Can be obtained as a two-color molded body of the container body.

Next, the attachment shaft 5 is joined to the hard resin portion 12c. As a joining form of this joining part 16, when the attachment shaft 5 and the hard resin part 12c are different materials, joining with an adhesive agent is generally possible, for example. Moreover, when using the hard resin of the same material as the attachment shaft 5 and the hard resin part 12c, joining by ultrasonic fusion is possible, for example. The attachment shaft 5 is a portion that receives vibration and causes the stirring cylinder portion 12 to stir, and is joined to the hard resin portion 12c only at its tip surface. For this reason, the stronger the bonding force at the bonding surface 16a, the better. In this sense, the joining by ultrasonic fusion is not only stronger than the above-mentioned adhesive joining, but also the joining time is short and the joining work is easy. Therefore, in the above two examples, bonding by ultrasonic fusion is preferable to adhesive bonding.
Note that it can be assumed that ultrasonic welding is possible even with different materials, or ultrasonic welding is impossible even with the same material. Therefore, when the ultrasonic welding surface is formed as the bonding surface 16a by ultrasonic welding, the mounting shaft 5 and the hard resin portion 12c are formed of a material that can be ultrasonically welded regardless of the difference in material. Will do.

  After the mounting shaft 5 is integrated as described above, the viscous fluid-filled damper of this embodiment can be obtained by filling the inside with the viscous fluid 10 and ultrasonically welding the peripheral wall portion 11 and the lid portion 6. 15 will be obtained.

  Next, operations and effects of the viscous fluid-filled damper 15 according to this embodiment will be described except for those already described.

  The viscous fluid-filled damper 15 has the tip of the mounting shaft 5 joined only to the hard resin part 12c of the stirring cylinder part 12, and the remaining part is joined to the stirring cylinder part 12 (accommodating recess 13). Absent. In other words, the inner peripheral surface 13 b on the opening end 13 c side of the housing recess 13 and the outer peripheral surface 5 g of the shaft portion 5 b of the mounting shaft 5 are used as a non-restraining portion 17 that can be contacted and separated. For this reason, even when a large amplitude vibration or impact is applied along the axial direction of the mounting shaft 5, as shown in FIG. 2, the stirring cylinder portion 12 on the opening end 13 c side of the housing recess 13 is flexibly deformed. . The thickness of the flexible portion 3 around the opening end 13c side of the housing recess 13 is not stretched thinner than the thickness of the stirring tube portion 12 on the opening end 13c side of the housing recess 13. Therefore, the possibility that the flexible portion 3 is broken as in the second prior art described above is eliminated. As a result, it is possible to realize a high-quality viscous fluid-filled damper 15 having high durability and reliability and capable of obtaining a sufficient vibration damping effect.

  The attachment shaft 5 can be firmly fixed by adhesively bonding the tip of the attachment shaft 5 and the hard resin portion 12c or by ultrasonic welding. For this reason, the attachment shaft 5 does not slip inside the accommodating recess 13 or come out of it. Therefore, the inner peripheral surface 13b of the housing recess 13 is not broken.

  By joining the tip of the mounting shaft 5 and the hard resin portion 12c by ultrasonic fusion and forming an ultrasonic fusion surface as the joining surface 16a, a very strong joining force can be obtained. For this reason, even if the viscous fluid-filled damper 15 is small and the area of the joint surface 16a is small, it can be firmly joined and prevented from coming off.

  By forming the interface between the flexible portion 3 of the rubber-like elastic body and the hard resin portion 12c as a molding surface obtained by two-color molding, a tight and firm joint surface can be obtained. For this reason, the viscous fluid 10 does not leak to the outside through the interface.

  Since the length of the shaft portion 5 is such that it protrudes from the upper end opening of the housing recess 13, a gap is formed between the partition wall portion 5 c and the flexible portion 3, so that they hardly come into contact with each other. ing. Therefore, there is no inconvenience that the flexible portion 3 made of a soft rubber-like elastic body is rubbed with the partition wall portion 5c and is broken when receiving vibration.

  The distance between the step portion 5f of the locking piece 5e of the attachment portion 5d and the partition wall portion 5c facing the step portion 5f is substantially the same as the plate thickness of the housing 7 or the mechanical chassis 4. For this reason, when the latching piece 5e is latched with respect to the housing | casing 7 or the mechanical chassis 4, the housing | casing 7 or the mechanical chassis 4 is clamped by the latching piece 5e and the partition part 5c substantially without play. . Therefore, the viscous fluid-filled damper 15 can be reliably fixed to the housing 7 or the mechanical chassis 4.

When the casing 7 or the mechanical chassis 4 is thus sandwiched between the locking pieces 5e and the partition wall portion 5c without substantial play, the partition wall portion 5c comes into surface contact with the plate surfaces. That is, due to the surface contact of the partition wall portion 5c, the mounting posture of the mounting shaft 5 with respect to the housing 7 or the mechanical chassis 4 is not inclined with respect to the plate surface but is substantially orthogonal to the plate surface. Be regulated. For this reason, with the viscous fluid-filled damper 15 attached to the housing 7 or the mechanical chassis 4, the stirring cylinder portion 12 is as close as possible to the axial direction of the peripheral wall portion 11 so that stirring is possible in all directions. Can be maintained.
Moreover, since the stirring cylinder part 12 can be made to follow the axial center direction of the surrounding wall part 11 as much as possible, the flexible part 3 continuous with the stirring cylinder part 12 is not deformed, and is in a natural state. For this reason, ideal elastic deformation is possible in all directions, and the vibration damping effect can be appropriately exhibited.

  The sealed container 2 is formed of a peripheral wall portion 11 made of a hard resin, a dome-shaped flexible portion 3 having a stirring cylinder portion 12, and a lid portion 6. For this reason, the stirring cylinder portion 12 can stir the viscous fluid 10 while the peripheral wall portion 11 maintains a predetermined shape. Therefore, the vibration of the supported body (for example, the mechanical chassis 4 of the disk device 9) can be sufficiently damped.

  Finally, a modification of the first embodiment will be described.

  In the said embodiment, although the example which manufactures the surrounding part 11 and the flexible part 3 containing the hard resin part 12c by two-color molding was demonstrated, it may not be a two-color molding method. For example, the peripheral wall portion 11 and the hard resin portion 12c are obtained in advance by injection molding, transferred to a molding die of the flexible portion 3, and the flexible portion 3 is injection-molded with respect to them. A body compact can also be manufactured. However, two-color molding is more preferable from the viewpoint of productivity.

In the embodiment, a substantially concentric gap is formed between the shaft portion 5 b of the mounting shaft 5 and the housing recess 13. However, depending on the joining position of the mounting shaft 5 with respect to the hard resin portion 12c, the mounting shaft 5 may be joined to the accommodating recess 13 in an eccentric state. In such a case, the possibility that the mounting shaft 5 rubs against the housing recess 13 and breaks cannot be completely wiped out. However, since there is still a non-contact portion, the possibility of partial breakage can be avoided.
In this case, as a suboptimal measure, it is possible to avoid the possibility of breaking the contact portion by applying a lubricant.
Further, as shown in FIG. 3, for example, a positioning protrusion 5h is formed at the tip of the mounting shaft 5, and a positioning recess 12d that engages with the hard resin portion 12c is formed so that the axis can be easily aligned. You can also. Of course, a positioning recess can be formed in the mounting shaft 5 and a positioning projection can be formed in the hard resin portion 12c.

Second Embodiment [FIG. 4]
The viscous fluid-filled damper 18 of the second embodiment is different from the viscous fluid-filled damper 15 of the first embodiment in the structure of the mounting shaft 5 first, and secondly the mounting shaft 5 and the stirring cylinder portion 12. It is the junction structure of the junction part 16. Since the remaining configuration is the same as that of the first embodiment, a duplicate description is omitted.

That is, in the viscous fluid-sealed damper 18 of the present embodiment, the first, the mounting shaft 5 and forms a shaft portion 5b, and a mounting portion 5d and the partition wall portion 5c as a separate member. The shaft portion 5b is provided with a columnar coupling protrusion coaxially with the shaft center. The partition wall portion 5c is formed with a connection concave portion into which the connection protrusion of the shaft portion 5b is inserted. Secondly, the annular bottom portion 12 b of the stirring tube portion 12 is joined to the shaft portion 5 b of the mounting shaft 5 so as to abut against the mounting shaft 5 in the radial direction.
As a manufacturing method for obtaining a joint between the shaft portion 5 b of the mounting shaft 5 and the stirring tube portion 12, the stirring tube portion 12 may be formed in two colors with respect to the mounting shaft 5. That is, the shaft portion 5b of the mounting shaft 5 is obtained by injection molding using a two-color molding die, and then the flexible portion 3 is injection-molded so that the shaft portion 5b and the stirring cylinder portion 12 are made as described above. Form and join. And the connection protrusion of the shaft part 5b is inserted into the connection recessed part of the partition part 5c obtained separately, and both are integrally connected with an adhesive.

  Next, the operation and effect of the viscous fluid-filled damper 18 will be described. The joining portion 16 is formed and joined so that the annular bottom portion 12b of the stirring cylinder portion 12 abuts against the outer peripheral surface of the shaft portion 5b of the attachment shaft 5 in the radial direction of the attachment shaft 5. In the first embodiment, the entire surface of the housing recess 13 that faces the tip of the mounting shaft 5 is the hard resin portion 12c and is ultrasonically welded to each other. However, the shaft alignment between the mounting shaft 5 and the hard resin portion 12c is performed. difficult. However, according to the present embodiment, since the bottom 12b of the stirring tube portion 12 is molded and joined to the outer peripheral surface of the mounting shaft 5 using a two-color molding die, the mounting shaft 5 is always aligned. Can be integrated with the stirring cylinder portion 12.

  Further, the stirring tube portion 12 is formed with a bent portion having a cylindrical portion 12a and a bottom portion 12b having an L-shaped cross section. In the first embodiment described above, as shown in FIG. 2, when the mounting shaft 5 is pulled, the opening end side of the stirring cylinder portion 12 uses the joint surface 12 e between the cylindrical portion 12 a and the hard resin portion 12 c as a fulcrum. Expand and expand. That is, a direct peeling force acts on the bonding surface 12e. However, in the present embodiment, even if the attachment shaft 5 is pulled as in FIG. 2, the opening end side of the stirring cylinder portion 12 has an L-shaped cross section that is a boundary between the cylindrical portion 12a and the bottom portion 12b. The bent part is deployed as a fulcrum. That is, the joint surface 12e between the cylindrical portion 12a and the bottom portion 12b does not serve as a fulcrum for deployment. Therefore, the durability at the joint surface 12e can be enhanced as compared with the first embodiment.

Third Embodiment (FIG. 5)
Compared with the viscous fluid-filled damper 18 of the second embodiment described above, the viscous fluid-filled damper 19 of the third embodiment has a connection portion 16 between the bottom 12b side of the stirring tube portion 12 and the tip 5i side of the shaft portion 5. The structure is different. Since the remaining configuration is the same as that of the second embodiment, redundant description is omitted.

  In the viscous fluid-filled damper 19 of the present embodiment, the tip 5i side of the mounting shaft 5 is joined to the bottom 12b of the stirring cylinder portion 12 in a buried state, specifically, as a joint portion 16 joined with an adhesive. is there. When the mounting shaft 5 has the same structure as that of the second embodiment, the shaft portion 5b of the mounting shaft 5 is obtained by injection molding using a two-color molding die, and then the flexible portion 3 is injection molded. By doing so, it can also be set as the junction part 16 which joined the front-end | tip 5i side of the attachment shaft 5 with respect to the bottom part 12b of the stirring cylinder part 12 in an embedded state.

Next, functions and effects will be described. The joining part 16 joins the front-end | tip 5i side of the attachment shaft 5 to the bottom part 12b of the stirring cylinder part 12 in the buried state. For this reason, the area of the joining portion 16 is increased, and the joining strength between the bottom portion 12b of the stirring tube portion 12 and the tip 5i side of the mounting shaft 5 is increased. Therefore, sufficient bonding strength can be obtained.
Further, the joint 16 does not come into contact with the viscous fluid 10. For this reason, even if there exists a small unbonded part in the junction part 16, it can prevent that the viscous fluid 10 leaks out from the part.
In the viscous fluid-filled damper 19 of the present embodiment as well, as in the second embodiment, the opening end side of the stirring tube portion 12 develops with a bent portion having an L-shaped cross section as a fulcrum as in the second embodiment. . For this reason, the force which peels directly with respect to the junction part 16 by an adhesive agent does not act, and durability of the junction part 16 can be improved rather than 1st Embodiment.

Fourth Embodiment [FIGS. 6 and 7]
The viscous fluid-filled damper 20 of the fourth embodiment is a modified form of the viscous fluid-filled damper 15 of the first embodiment described above. Compared with the first embodiment, the viscous fluid-filled damper 20 of the present embodiment first has a partition wall portion 5c protruding in the direction perpendicular to the axis of the mounting shaft 5 as a corner shape of the mechanical chassis 4 serving as a supported member. The difference is that an attachment portion 5k that extends through a bent portion so as to match and fixes the tension coil spring 25 to the upper end portion is provided. Secondly, the structure in which the hard resin portion 12c is provided in the entire bottom portion 12b of the stirring cylinder portion 12 by two-color molding is also different.

Such a viscous fluid-filled damper 20 of the fourth embodiment is provided with a mounting portion 5k that extends through a bent portion so that the partition wall portion 5c matches the corner shape of the mechanical chassis 4, and is formed in the mounting portion 5k. The tension coil spring 8 is fixed to the fixing hole. For this reason, it is not necessary to provide the fixed part of the tension coil spring 8 in the mechanical chassis 4.
Further, since the entire bottom portion 12b of the stirring tube portion 12 is the hard resin portion 12c, even if the bottom portion 12b of the stirring tube portion 12 comes into contact with the lid portion 6 due to a large amplitude in the axial direction, the bottom portion of the stirring tube portion 12 The high-quality viscous fluid-filled damper 20 can be obtained without breaking 12b, having high durability and reliability.

B. Embodiment of Vibration Damping Device Next, an example of an embodiment relating to a vibration damping device in which the viscous fluid-filled damper of the above-described embodiment and the coil spring shown in the conventional example are integrated to form a module will be described. The viscous fluid-filled damper provided in the vibration damping device will be described as a representative example of a modified version of the first embodiment described above, but the same changes are made to the viscous fluid-filled dampers other than the first embodiment. Of course, it is also possible to configure each vibration damping device described later.

First Embodiment (FIGS. 8 and 9)
The vibration damping device 21 according to the first embodiment includes a viscous fluid-filled damper 22 and a compression coil spring 23.

The basic structure of the viscous fluid-filled damper 22 is the same as that of the viscous fluid-filled damper 15 of the first embodiment, but differs in the following points.
1st Embodiment WHEREIN: The partition part 5c of the attachment shaft 5 in 1st Embodiment is comprised as the protrusion part 5m further made to protrude outward in the shape of a square plate. Therefore, the protruding portion 5m functions as a partition portion and also functions as a portion that receives a bias of a compression coil spring 23 described later.
2ndly, in the viscous fluid enclosure damper 22 of this embodiment, it is set as the structure which provided the protrusion part 11a which protrudes large in an annular shape in the surrounding wall part 11 of the airtight container 2. As shown in FIG.

  And the compression coil spring 23 which supports the load of the mechanical chassis 4 used as a to-be-supported body is attached concentrically between the above protruding parts 5m and the protruding part 11a. Therefore, the protrusions 5m and 11a function as portions that receive the bias of the compression coil spring 23.

According to the vibration damping device 21 of the first embodiment configured as described above, the viscous fluid-filled damper 22 is provided, and the protrusion that protrudes outward from the mounting shaft 5 and the sealed container 2 of the viscous fluid-filled damper 22 is provided. In addition to providing the portions 5m and 11a, a viscous fluid-filled damper is provided so that the compression coil spring 23 that supports the load of the mechanical chassis 4 that is the supported body surrounds the hermetic container 2 between the protrusions 5m and 11a. 22 is provided concentrically. For this reason, the impact applied to the airtight container 2 and the mounting shaft 5 can be relieved by the compression coil spring 23, and the disconnection of the mounting shaft 5 and the breakage of the flexible portion 3 can be further eliminated.
The vibration damping device 21 is configured as a module in which a viscous fluid-filled damper 22 and a compression coil spring 23 are combined. For this reason, since it is possible to eliminate the need to separately install a spring as in the conventional example, the disk device 24 can be easily assembled (FIG. 9).

  In the said embodiment, although the protrusion part 5m was made into square plate shape, it is good also as disk shape similarly to the protrusion part 11a of the surrounding wall part 11. FIG. Moreover, in the said embodiment, although the compression coil spring 23 is received by the protrusion part 11a of the surrounding wall part 11, you may comprise so that it may receive by the cover part 6. FIG.

Second Embodiment [FIGS. 10 and 11]
The vibration damping device 25 according to the second embodiment includes a viscous fluid-filled damper 26 and a tension coil spring 27.

The basic structure of the viscous fluid-filled damper 26 of this embodiment is the same as that of the viscous fluid-filled damper 15 of the first embodiment, but differs in the following points.
1st Embodiment WHEREIN: The partition part 5c of the attachment shaft 5 in 1st Embodiment is comprised as the protrusion part 5n further made to protrude in the disk shape outward.
Secondly, the lid 6 is provided with a cylindrical protrusion 6b that protrudes in the cylinder axis direction of the peripheral wall 11.

  A tension coil spring 27 that suspends and supports the mounting shaft 5 on which the load of the mechanical chassis 4 serving as a supported body is applied is suspended between the protruding portion 5n and the protruding portion 6b.

According to the vibration damping device 25 of the second embodiment configured as described above, the viscous fluid-filled damper 26 is provided, and the protruding portion further protrudes the partition wall portion 5c of the mounting shaft 5 of the viscous fluid-filled damper 26. A tension coil spring 27 that suspends and supports the mounting shaft 5 to which the load of the supported body is applied between 5n and the protruding portion 6b that protrudes in the cylinder axis direction of the peripheral wall portion 11 from the lid portion 6 of the viscous fluid-filled damper 26. Is provided. For this reason, the impact applied to the airtight container 2 and the attachment shaft 5 can be eased, and the disconnection of the attachment shaft 5 and the tearing of the flexible portion 3 can be further eliminated.
Further, the vibration damping device 25 is configured as a module in which a viscous fluid-filled damper 26 and a tension coil spring 27 are combined together. For this reason, when the vibration damping device 25 of the second embodiment is assembled to the disk device 28, it is not necessary to assemble a separate spring as in the conventional example, so that the disk device 28 can be easily assembled (see FIG. 11).

Third Embodiment [FIGS. 12 and 13]
The vibration damping device 29 according to the third embodiment includes a viscous fluid-filled damper 30 and a tension coil spring 31.

The basic structure of the viscous fluid-filled damper 30 of this embodiment is the same as that of the viscous fluid-filled damper 15 of the first embodiment, but differs in the following points.
First, an attachment projection 5p having an L-shaped cross section is provided on the partition wall portion 5c of the attachment shaft 5, and an attachment portion 5r for fixing one end of the tension coil spring 31 is provided.
Secondly, an attachment protrusion 6c having an L-shaped cross section is provided on the lid portion 6 and an attachment protrusion 6d for fixing the other end of the tension coil spring 31 is provided.

  When the vibration damping device 29 is used, for example, as shown in FIG. 13, the attachment protrusion 5 p of the attachment shaft 5 is engaged with an engagement hole (not shown) formed through the side surface of the mechanical chassis 4. Install. Further, the attachment protrusion 6 c of the lid 6 is attached by being engaged with an engagement hole formed on the side surface of the housing 7. Then, the mechanical chassis 4 is elastically supported by the tension coil spring 31 that suspends and supports the mounting shaft 5, and the stirring cylinder portion 12 is not displaced by the load of the mechanical chassis 4 in a no-vibration state. Maintained.

According to the vibration damping device 29 of the third embodiment as described above, the viscous fluid-filled damper 30 is provided, one end side is fixed to the mounting shaft 5 of the viscous fluid-filled damper 30 and the other end side to the sealed container 2. A tension coil spring 31 that is fixed and supports the load of the supported body is provided so that the stirring cylinder portion 12 is not displaced by the load of the supported body. For this reason, the impact added to the airtight container 2 and the attachment shaft 5 can be relieved. Therefore, it is possible to further eliminate the disconnection of the attachment shaft 5 and the breakage of the flexible portion 3.
The vibration damping device 29 has a module configuration in which a viscous fluid-filled damper 30 and a tension coil spring 31 are combined. For this reason, when the vibration damping device 29 is assembled to the disk device 32, it is possible to eliminate the need to separately assemble a spring as in the conventional example, so that the disk device 32 can be easily assembled (FIG. 13).

C. Modified Example of Embodiment Next, a modified example of the above embodiment will be described.
In the second embodiment of the viscous fluid-filled damper, the mounting shaft 5 is configured with the shaft portion 5b, the mounting portion 5d, and the partition wall portion 5c as separate bodies. However, the viscous fluid-filled damper and each vibration damping other than the second embodiment are configured. The mounting shaft of the viscous fluid-filled damper of the apparatus can also be implemented with such a structure.

Further, in each of the above-described viscous fluid-filled dampers, the partition wall portion 5 c and the attachment portion 5 d are formed as a part of the attachment shaft 5, and the attachment portion 5 d of the attachment shaft 5 is related to the mechanical chassis 4 or the housing 7. The viscous fluid-filled damper is fixed to the mechanical chassis 4 or the housing 7. However, as shown in FIG. 14 as an example, the fixture 4 b is provided as a configuration attached to the mechanical chassis 4, the end of the mounting shaft 5 is inserted into the fixture 4 b, and the viscous fluid-filled damper is attached to the mechanical chassis 4. It can implement also as a structure fixed with respect to the attachment 4b with respect to it.
In other words, the fixture 4b includes a pair of arrowhead-shaped locking pieces 4c that are locked to the edge of the hole through the locking holes 4a formed in the mechanical chassis 4, and a claw portion 4d that fixes the end of the mounting shaft 5. And an engaging portion 4e protruding. An engaging recess 5 s that engages with the claw portion 4 d is formed on the outer peripheral surface of the end portion of the mounting shaft 5. Therefore, when the attachment shaft 5 is inserted into the engaging portion 4e, the claw portion 4d engages with the engaging recess 5s, and the viscous fluid-filled damper is fixed to the mechanical chassis 4.
In addition, although the example which fixes the attachment shaft 5 with respect to the mechanical chassis 4 was shown in FIG. 14, the same fixture may be provided in the housing | casing 7, and you may make it fix the attachment shaft 5 to this.

Sectional drawing of the viscous fluid enclosure damper by 1st Embodiment. Operation | movement explanatory drawing of the viscous fluid enclosure damper of FIG. The principal part explanatory drawing which expands and shows the positioning structure of the attachment shaft of FIG. Sectional drawing of the viscous fluid enclosure damper by 2nd Embodiment. Sectional drawing of the viscous fluid enclosure damper by 3rd Embodiment. Sectional drawing of the viscous fluid enclosure damper by 4th Embodiment. FIG. 7 is an explanatory diagram of a disk device including the viscous fluid-filled damper of FIG. Sectional drawing of the vibration damping device by 1st Embodiment. FIG. 9 is an explanatory diagram of a disk device including the vibration damping device of FIG. 8. Sectional drawing of the vibration damping device by 2nd Embodiment. Explanatory drawing of a disk apparatus provided with the vibration damping device of FIG. Sectional drawing of the vibration damping device by 3rd Embodiment. FIG. 13 is an explanatory diagram of a disk device including the vibration damping device of FIG. 12. The principal part expanded sectional view which shows the modification of each embodiment of an attachment shaft. Explanatory drawing of a disk apparatus provided with the viscous fluid enclosure damper by a 1st prior art example. FIG. 16 is a cross-sectional view of the viscous fluid-filled damper in FIG. 15. Operation | movement explanatory drawing of the viscous fluid enclosure damper of FIG. Sectional drawing of the viscous fluid enclosure damper by a 2nd prior art example. Operation | movement explanatory drawing of the viscous fluid enclosure damper of FIG.

Explanation of symbols

1 Damper containing viscous fluid (first conventional example)
2 Sealed container 3 Flexible part 4 Mechanical chassis 4a Locking hole 4b Attachment 4c Locking piece 4d Claw part 4e Engagement part 5 Mounting shaft 5a Engagement head 5b Shaft part 5c Partition part 5d Mounting part 5e Locking piece 5f Stepped portion 5g Outer peripheral surface 5h Positioning projection 5i Tip 5k Mounting portion 5m Projecting portion 5n Projecting portion 5p Mounting projection 5r Mounting portion 5s Engaging recess 6 Lid portion 6a Screw hole 6b Projecting portion 6c Mounting projection 6d Mounting projection 7 Housing 7a Locking Hole 8 Suspension spring 9 Disk device 10 Viscous fluid 11 Circumferential wall portion 11a Projection portion 12 Stirring cylinder portion 12a Tubular portion 12b Bottom portion 12c Hard resin portion 12d Positioning recess portion 12e Joining surface 13 Housing recess portion 13a Bottom portion 13b Inner circumferential surface 13c Open end 14 Viscous fluid filled damper (second conventional example)
15 Damper filled with viscous fluid (first embodiment)
16 Joining part 16a Joining surface 17 Unconstrained part 18 Viscous fluid-filled damper (second embodiment)
19 Damper filled with viscous fluid (Third embodiment)
20 Damper filled with viscous fluid (fourth embodiment)
21 Vibration damping device (first embodiment)
22 Damper filled with viscous fluid 23 Compression coil spring 24 Disk device 25 Vibration damping device (second embodiment)
26 Viscous Fluid Enclosed Damper 27 Tension Coil Spring 28 Disk Device 29 Vibration Damping Device (Third Embodiment)
30 Damper containing viscous fluid 31 Tension coil spring 32 Disk device N Mounting screw

Claims (8)

A sealed container having a stirring cylinder part formed with an accommodating recess and enclosing a viscous fluid therein;
A shaft portion that is accommodated in the accommodation recess, and an attachment shaft that protrudes to the outside from the opening end of the accommodation recess and is attached to either the support or the supported body, and a mounting shaft.
In the viscous fluid-filled damper that attenuates the vibration of the support or the supported body by the viscous resistance of the viscous fluid stirred by the stirring cylinder portion,
The stirring cylinder part has a bottom part and a cylindrical part made of a rubber-like elastic body,
To the tip of the bottom portion and the shaft portion of the stirring拌筒portion, while Ru provided joints by adhesive bonding or fusion bonding between the agitation cylinder portion and the shaft portion, the outer periphery of the shaft portion of the entire inner peripheral surface of the cylindrical portion A viscous fluid-filled damper characterized in that it is a non-restraining portion that can be contacted and separated from the surface , and that the opening end side of the cylindrical portion can be opened against vibrations and shocks along the axial direction of the mounting shaft. . A hard resin portion is provided at a position facing the tip surface of the mounting shaft at the bottom of the stirring cylinder portion,
The viscous fluid-filled damper according to claim 1, wherein the tip end surface of the mounting shaft and the hard resin portion are joined as the joining portion.   The viscous fluid-filled damper according to claim 1, wherein a bottom portion of the stirring cylinder portion is joined to the outer peripheral surface on the tip end side of the mounting shaft as the joining portion. As the joint, the viscous fluid-sealed damper according to claim 1, wherein the tip end of the mounting shaft and joined in retracted state relative to the bottom of the agitation cylinder portion.   The viscous fluid-filled damper according to any one of claims 1 to 4, wherein a partition wall portion protruding in an axis crossing direction of the mounting shaft is formed between the shaft portion of the mounting shaft and the mounting portion.   A hermetic container, a cylindrical peripheral wall portion, a flexible portion made of a rubber-like elastic body having the stirring cylinder portion along the cylindrical axis direction of the peripheral wall portion and closing one end side of the peripheral wall portion, and the peripheral wall The viscous fluid-filled damper according to any one of claims 1 to 5, wherein the damper is formed with a lid portion that closes the other end side of the portion.   A vibration damping device comprising the viscous fluid-filled damper according to any one of claims 1 to 6, wherein an outwardly projecting portion is provided on an attachment shaft and a sealed container of the viscous fluid-filled damper, respectively. A vibration damping device in which a compression coil spring for supporting the load of the supported body is provided concentrically with the viscous fluid-filled damper between the protrusions.   A vibration damping device comprising the viscous fluid-filled damper according to any one of claims 1 to 6, wherein one end side is fixed to a mounting shaft of the viscous fluid-filled damper and the other end side is fixed to a sealed container. A vibration damping device provided with a tension coil spring that suspends and supports the mounting shaft to which the load of the supported body is applied so that the stirring cylinder portion is not displaced by the load of the supported body.

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