Classifications

• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
  • G11B19/20—Driving; Starting; Stopping; Control thereof
  • G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J15/00—Sealings
  • F16J15/16—Sealings between relatively-moving surfaces
  • F16J15/40—Sealings between relatively-moving surfaces by means of fluid
  • F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
  • G11B33/14—Reducing influence of physical parameters, e.g. temperature change, moisture, dust
  • G11B33/1446—Reducing contamination, e.g. by dust, debris
  • G11B33/1473—Reducing contamination, e.g. by dust, debris of/from bearings

Definitions

• the present invention is suitable for use in a sealed structure of a rotating shaft portion of a fixed magnetic storage device such as a hard disk as a magnetic recording medium for a computer.
• a fixed magnetic storage device such as a hard disk as a magnetic recording medium for a computer.
• the structure of a conventional magnetically drawn fluid seal is, for example, It is disclosed under License No. 4 252 533. That is, as shown in Fig. 1, the structure is a soft magnetic shutter 7 and two rectangular pole pieces 2 and sandwiched between them in the direction of the arrow (arrow). 1) and a magnetic fluid film 4 magnetically captured in the air gap.
• a leakage magnetic field is generated from the outer shape (radial direction) of the seal, and the magnetic field is generated in other electronic components of the electronic device incorporating the magnetic fluid seal device of this kind. It creates drawbacks that cause obstacles.
• FIG. 2A shows a normal case, in which arrows indicate magnetic lines of force in the gap between the shaft 1, the pole pieces 2, and the permanent magnet 3.
• the magnetic field lines of the pole piece 2 and the magnetic field lines of the permanent magnet 3 are spatially separated, the magnetic fluid ring film, the pole piece 2 and the permanent magnetic field as shown in FIG.
• the magnets 3 are separated into two pieces to form a two-stage seal.
• the state of the lines of magnetic force in the gap in the case of the bending is indicated by an arrow.
• the magnetic field lines flowing into the pole beam 2 flow not only from the shaft 1 but also those starting from the inner diameter surface of the permanent magnet 3 and flow together.
• the magnetic field lines of the pole pieces 2 and the magnetic field lines of the permanent magnets 3 are not separated from each other because the magnetic field lines are disturbed in the radial direction and the shaft axis direction. Accordingly, as shown in FIG. 3B, the magnetic fluid ring film 4 is not separated from the pole pieces 2 and the permanent magnets 3 but connected to each other. . Therefore, what was originally
• the present invention provides a permanent magnet magnetized in the radial direction and an annular portion extending in the ⁇ direction for blocking leakage magnetic flux generated on the peripheral side surface by the permanent magnet.
• An annular pole piece is provided, and magnetic fluid is magnetically captured between the pole piece and the shaft, and between the permanent magnet and the shaft.
• the aim is to propose a magnetic fluid sealing device that can shut off the leakage magnetic flux generated from the permanent magnets by configuring the magnetic fluid sealing device to
• the present invention provides a method for manufacturing a vehicle, comprising: a flat portion of a permanent magnet ring and a flat portion of a pole ring;
• the magnetic fluid is magnetized in the radial direction.
• a magnetic fluid is magnetically provided between the pole piece and the shaft and between the permanent magnet and the shaft.
• the pole piece above is covered by the pole piece.
• Half-section L-shaped soft magnetic pole piece that covers the outer diameter of a ring-shaped permanent magnet magnetized in the radial direction and has a certain distance from the flat part of the permanent magnet
• a magnetic fluid sealing film device comprising a magnetic fluid ring film magnetically captured in an air gap between the permanent magnet inner diameter and the permanent magnet inner diameter. If both of the plane parts facing the pole piece ring plane part are opposed to each other, a projection is provided at any one of the plane parts, and the permanent magnet ring plane part facing the pole piece ring and the pole part.
• a magnetic fluid sealing device in which the distance between the surface portions of the piece rings is made constant.
• the lines of magnetic force flowing into the above-mentioned pole piece are not
• the one that has started from the inner surface of the permanent magnet described above is also flowing in, and the direction of the magnetic force line is disturbed in the radial direction and the direction of the shutter, and the pole bus is disturbed.
• the disadvantage that the magnetic field lines of the permanent magnet and the magnetic field lines of the permanent magnet are no longer separated is eliminated, and the magnetic fluid ring membrane is connected to the pole pieces and the permanent magnet.
• a new S-paper that originally has a two-tiered seal becomes a one-tiered seal Is eliminated. Therefore, since the distance between the flat portion of the pole-sling and the flat portion of the permanent magnet can be surely kept constant, it is possible to provide a highly reliable multi-stage magnetic solid seal. It becomes possible.
• FIG. 1 is a cross-sectional view showing an example of a conventional sealing device
• FIGS. 2A and 2B and FIGS. 3A and 3B are diagrams for explaining the operation of the conventional device
• FIG. FIG. 5 is a cross-sectional view showing an example, FIG. 5, FIG. 6, FIG. 7, FIG. 8, FIG. 9, FIG. 10, FIG. 11, FIG. It is a sectional view.
• FIG. 4 is a cross-sectional view showing an example of the present invention.
• FIG. 4 shows a drinkable magnetic shaft, and a shaft 11 (martensite stainless steel, carbon steel).
• Soft magnetic pole pieces with an L-shaped ring with almost half cross section 1 2 Martensite stainless steel, fly plastic plastic, Soft magnets, palms, soft 7-lites, etc.
• permanent magnets 13 radiated sintered magnets, fly-based plastics
• X-ray magnets, iron-chromium cobalt magnets, rare-earth magnets, rare-earth plastic magnets, and Ni7 magnets are provided with a certain distance between them.
• This interval is — Magnetic field differs between pole piece 12 and shaft 11 and between permanent magnet 13 and shaft 11 Fluid 14 (Solvent is synthetic oil, alkinaphtalin mineral oil, silicone oil, phenolic carbon, etc.) (Composed of jink, ferrite, etc.) are magnetically captured. Accordingly, one of the magnetic fluxes leaked by the permanent magnets 13 ′ passes through the pole piece 12 and the other leaks out to the outside (in the direction of the arrow in the figure). Leakage of the permanent magnet 13 in the radial direction is caused by leakage to the outer peripheral side of the pole piece 12 because the pole piece 12 substantially covers the peripheral surface of the permanent magnet 13. No magnetic flux is generated.
• Solvent synthetic oil, alkinaphtalin mineral oil, silicone oil, phenolic carbon, etc.
• FIG. 5 is a sectional view showing another embodiment of the present invention.
• two sets of the pole piece 12 and the permanent magnet 13 shown in FIG. 4 were installed such that the permanent magnets 13 were in contact with each other. It is.
• the magnetization direction of the permanent magnet 13 is formed in the axial direction of the shaft 11. Therefore, the leakage magnetic flux due to the permanent magnet 13 is not generated as in the example of FIG.
• FIG. S is a cross-sectional view showing still another example of the present invention.
• the structure shown in FIG. 4 has an inner peripheral surface of a half-section L-shaped pole piece 12.
• the ring-shaped soft magnetic housing 15 is bonded and fixed without gaps.
• the magnetization direction of Permanent Magnet JT 13 is shaped in the direction of the shaft of shaft 11.
• the pole piece 16 is formed by integrating the ring 15 into a single piece, that is, a pole piece 16 provided with a step having a size corresponding to the annular soft magnetic housing 15.
• the magnetization direction of the permanent magnet 13 is formed in the direction of the core of the shaft 11. Accordingly, one of the magnetic fluxes leaked from the permanent magnet 13 passes through the pole piece 16 and the other leaks to the outside. Since the magnetic flux is covered by the ball piece 16, a shallow magnetic flux to the outer peripheral side of the pole piece 16 does not occur-FIG.
• FIG. 8 shows another example of the present invention. It is sectional drawing which shows an Example.
• the annular portion 22 of the pole piece 12 is further formed to extend in the direction of the shaft 11. It is.
• the direction of magnetization of the permanent magnet 13 is formed in the direction of the center of the shaft 11.
• FIG. 9 is a sectional view showing another embodiment of the present invention.
• the distance between the side faces of the pole piece 12 and the permanent magnet 13 is set to be small. They are intended to be in close contact with each other.
• the magnetization direction of the permanent magnet 13 is formed in the core direction of the shaft 11. Therefore, one of the magnetic fluxes leaked from the permanent magnet 13 passes through the pole piece 12 and the other passes through the annular portion 23 and leaks to the outer periphery.
• the pole pieces 12 are covered in the radial direction of the permanent magnet 13, no leakage magnetic flux is generated on the outer side of the pole pieces 12. I get it.
• Fig. 10 is a cross-sectional view showing another embodiment of the present invention-; in this embodiment, the pole pieces 12 and the permanent magnets 13 of Fig. 9 are used. Unlike the combination, the pole pieces 24 and the permanent magnets 13 have the same outer diameter, and a soft magnetic housing 25 is fitted to the peripheral end faces of both. It is. In this case, it is permanent. The magnetization direction of magnet 13 is Therefore, the shallow magnetic flux generated by the permanent magnet 13 passes through the pole piece 24 and passes through the annular portion 25 to the outside. Leakage will occur, but since the annular portion 25 covers the radial direction of the permanent magnet 13, no leakage magnetic flux will be generated on the outer peripheral side.
• FIG. 11 is a sectional view showing another example of the present invention.
• the permanent magnet 13 is provided with a projection 32 provided on the flat surface thereof so as to be magnetized in the radial direction and to maintain a constant distance from the flat surface of the pole piece 12.
• the gap between the outer diameter of the shaft 11 and the inner diameter of the permanent magnet 13 and the pole piece 12 It is composed of a magnetic fluid ring membrane 14 which is magnetically implicated in the part.
• the permanent magnet 13 is composed of the inner diameter portion of the permanent magnet 13, the inner diameter portion of the pole piece 12, and the shaft 11. Since the group of magnetic force lines in the gap A is physically separated into two groups, a two-stage magnetic fluid seal can be formed with high reliability without requiring any mature lines. This will be
• FIG. 1 This is an example provided on the side of pole pieces 1 and 2.
• Reference numeral 27 denotes a projection integrally formed with the pole piece 12 with the same material. Therefore, since the projections 32 are provided on the permanent magnet 13, the permanent magnet 13 is composed of the inner diameter of the permanent magnet 13, the inner diameter of the pole piece 12, and the shaft 11. Since the magnetic field lines in the gap A are physically separated into two, the two-stage magnetic fluid seal structure can be formed with high reliability without any skill. .
• FIG. 13 shows an example in which the interval setting projection is provided so as to bite into both the pole piece 12 and the permanent magnet 11.
• Pole piece 1 2 Protrusion 2 8 Side is located on the shaft center side of shaft 11, and Protrusion 3 3 on permanent magnet 13 side is located on the peripheral side and engages with each other Combined-the two projections 28, 33 are of course possible even if their positions are changed from one another. Accordingly, the magnetic field lines of the air gap A formed by the inner diameter of the permanent magnet 13, the inner diameter of the pole piece 12, and the shaft 11 physically physically connect to each other. Since they are separated, a two-stage magnetic fluid seal structure can be formed with high reliability without any skill required. It does not preclude the adoption of other equivalent means. Therefore, it is needless to say that the present invention is applied to a device in which the present invention is further incorporated in a concrete receiving device. . Industrial applicability
• the magnetic fluid seal device of the present invention is useful as a rotary device seal device for high-speed rotation, and also as a rotary device for a computer disk. Dust from the surface, and contact with a seal device with extremely small gaps between pole pieces, and electronic devices that malfunction due to shallow magnetic flux. The application is to be applied to the rotating and sealing equipment provided.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=16374992

Family Applications (1)

Country Status (3)

Cited By (1)

Families Citing this family (1)

Citations (3)

• 1986
  • 1986-12-24 JP JP1986197468U patent/JPH0629566Y2/ja not_active Expired - Lifetime
• 1987
  • 1987-01-27 WO PCT/JP1987/000055 patent/WO1988005142A1/ja active Application Filing
  • 1987-01-27 DE DE19873790869 patent/DE3790869T/de not_active Withdrawn

Patent Citations (3)

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