JP2007162843A - Gas dynamic pressure bearing, and motor such as polygon scanner motor provided with gas dynamic pressure bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas dynamic pressure bearing, and a motor such as a polygon scanner motor provided with the gas dynamic pressure bearing capable of rotating smoothly by efficiently inhibiting generation of sliding powder even in repetitive turning stopping actions. <P>SOLUTION: The gas dynamic pressure bearing supports rotation by generating a dynamic pressure by relative rotation of a shaft member, and a bearing member fitting on the shaft member via a gas dynamic pressure space. The gas dynamic pressure bearing is composed by coating and molding a whole or at least a bearing surface of either one of the shaft member or the bearing member with a resin material mixed with a sliding performance improving subsidiary material, removing a skin layer of a portion to be the bearing surface, and exposing a surface of the sliding performance improving subsidiary material. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a gas dynamic pressure bearing used for information equipment, imaging equipment, and measuring equipment having high durability at high speed and durability, and a motor for color wheel having a gas dynamic pressure bearing, a fan motor, a polygon scanner motor, etc. About.

  Conventionally, this type of gas dynamic pressure bearing is excellent in economic efficiency, and in order to satisfy a functional life required even in a non-lubricated state, at least one of the shaft and the sleeve is made of an inorganic filler and a fibrous reinforcing material. What was shape | molded with the resin composition to contain is used.

However, those molded with such a resin composition form a skin layer whose surface is only a resin material, so that sliding powder is generated at the initial stage in repeated rotation stopping operations, and eventually sliding occurs. There is a disadvantage that the portion is clogged, causing problems such as damage to the bearing and inability to rotate.
JP-A-9-32851

  In view of the above-described conventional drawbacks, the present invention is a gas dynamic pressure bearing and a gas dynamic pressure bearing that can efficiently prevent sliding powder from being generated even in repeated rotation stopping operations and can be smoothly rotated. It aims at providing motors, such as a polygon scanner motor provided with.

The above and other objects and novel features of the present invention will become more fully apparent when the following description is read in conjunction with the accompanying drawings.
However, the drawings are for explanation only and do not limit the technical scope of the present invention.

In order to achieve the above object, the present invention provides a gas dynamic pressure bearing that generates dynamic pressure by relative rotation of a shaft member and a bearing member fitted to the shaft member via a gas dynamic pressure space, and supports the rotation. In this method, the whole or at least the bearing surface of either the shaft member or the bearing member is coated with a resin material kneaded with a slidability improving auxiliary material, and the skin layer of the portion that becomes the bearing surface is removed. The gas dynamic pressure bearing is configured by exposing the slidability improving auxiliary material to the surface.

  The present invention relates to a motor such as a polygon scanner motor provided with a gas dynamic pressure bearing, and improves the slidability of the whole or at least the bearing surface of either the shaft member or the bearing of the gas dynamic pressure bearing of the motor such as the polygon scanner motor. Form a film with a resin material kneaded with auxiliary materials, remove the skin layer on the bearing surface, and expose the sliding improvement auxiliary material on the surface, using a motor such as a polygon scanner motor. It is composed.

  As is clear from the above description, the present invention has the following effects.

(1) In a gas dynamic pressure bearing which generates dynamic pressure by relative rotation of a shaft member and a bearing member fitted to the shaft member via a gas dynamic pressure space, and supports the rotation, the shaft member and the bearing member Either the entire bearing surface or at least the bearing surface is molded from a resin material kneaded with a sliding property improving auxiliary material, and the skin layer of the portion that becomes the bearing surface is removed to provide the sliding property improving auxiliary material on the surface. Since the gas dynamic pressure bearing is exposed, the skin layer that easily becomes a sliding powder is removed even in repeated rotation stopping operations, and thus the generation of sliding powder can be efficiently prevented. .
Therefore, it is possible to efficiently prevent problems such as damage to the bearing and inability to rotate.

(2) Since the skin layer of the part that becomes the bearing surface is removed by (1) above, when the rotation is stopped, the slidability improving auxiliary material comes into contact with the part exposed on the surface and rotates smoothly without damage. Can be made.

(3) According to the above (1), since the process of removing the skin layer may be performed, it can be easily performed.

(4) Claims 2, 3, 4, and 5 can provide the same effects as the above (1) to (3).

  Hereinafter, the present invention will be described in detail with reference to the best mode for carrying out the invention shown in the drawings.

In the best mode for carrying out the present invention shown in FIGS. 1 to 4, reference numeral 1 denotes a motor such as a motor for a color wheel, a fan motor, or a polygon scanner motor provided with the gas dynamic pressure bearing of the present invention. In this embodiment, the polygon scanner motor 1 includes a shaft member 4 fixed to the substrate 2 via a shaft fixing member 3 and a gas dynamic pressure space 5 around the outer periphery of the shaft member 4. A bearing member 7 formed of SUS metal, sintered metal, bronze sintered metal, brass metal, aluminum material or the like having a support piece 6 protruding outward from a substantially central portion that can be fitted. A back yoke 8 fixed to the outer peripheral portion of the bearing member 7 below the support piece 6, a coil 9 attached to the substrate 2 so as to be positioned on the outer peripheral portion of the back yoke 8, and the bearing member A polygonal mirror 11 made of a material similar to the annular member 10 and attached to the upper part of the support piece 6 via the annular member 10, and the bearing member 7 for pressing and fixing the polygonal mirror 11. A multifaceted mirror presser 12 fitted to the upper outer peripheral portion of the upper member, a rotor case 13 attached so as to protrude downward from the lower end of the annular member 10, and the coil 9 of the rotor case 13. The shaft member 4 is composed of polyamide, polyacetal, polycarbonate, modified polyphenylene ether, polybutylene terephthalate, polyethylene terephthalate, ultrahigh molecular weight polyethylene, as shown in FIGS. 3 and 4. Preferably polysulfone, polyethersulfone, polyphenylene sulfide, polyrelay, which have higher heat resistance As a slidability improving auxiliary material, the ratio according to the purpose of use is selected for the base resin such as polyamide imide, polyether imide, polyether ether ketone, polyimide, liquid crystal polymer, fluorine resin, epoxy, etc., graphite, molybdenum disulfide, Lubricants such as tungsten disulfide, fluorine, PTFE, boron nitride, fluorinated graphite, and metals such as tin, silver, copper, nickel, or alloys thereof are low melting point metals (improves thermal conductivity), and carbon fiber as required In the outer peripheral portion of the shaft member main body 4a formed of SUS metal, sintered metal, bronze sintered metal, brass metal, aluminum material, etc. with a resin material kneaded with a reinforcing material such as potassium titanate fiber The shaft body 15 is formed into a film, and the skin layer 17 at the portion that becomes the sliding bearing surface 16 is removed by cutting, polishing, or the like. It is intended to expose the surface.
When the gas dynamic pressure groove is formed in the shaft member 4, the film thickness of the shaft body 15 remaining after removing the skin layer 17 is set to about 40 microns. Further, when the gas dynamic pressure groove is formed on the inner wall surface of the bearing member 7, the film thickness of the shaft body 15 remaining after the skin layer 17 is removed may be about 10 microns.
Alternatively, the shaft member body 4a and the shaft body 15 may be integrally formed using the material of the shaft body 15.

Since the skin layer 17 of the bearing surface 16 of the shaft member 4 is removed from the polygon scanner motor 1 having the gas dynamic pressure bearing configured as described above, the slidability of the shaft member 4 can be improved even in repeated rotation stopping operations. Since the bearing surface 16 where the auxiliary material is exposed and the bearing member 7 are in contact with each other, the skin layer from which sliding powder is generated is removed, so that it is possible to efficiently prevent problems such as damage to the bearing and inability to rotate. .
[Different forms for carrying out the invention]

  Next, different modes for carrying out the present invention shown in FIGS. 5 to 17 will be described. In the description of these different modes for carrying out the present invention, the same components as those in the best mode for carrying out the present invention are designated by the same reference numerals and redundant description is omitted. To do.

The second embodiment for carrying out the present invention shown in FIGS. 5 to 8 is mainly different from the best first embodiment for carrying out the present invention in that SUS metal, sintered metal, bronze. A shaft member 4B formed of a sintered metal, a brass-based metal, an aluminum material, or the like, and a bearing formed by coating on an inner wall surface serving as a bearing surface of the bearing body 7a in the same manner as the shaft member of the first preferred embodiment. A bearing member 7A from which the skin layer 20 of the bearing surface 19 of the member body 18 is removed, and an annular member 10A formed integrally with the bearing member 7A, and a gas constituted by using the bearing member 7A thus formed. Even with the polygon scanner motor 1A provided with the dynamic pressure bearing, the same effects as those of the best first embodiment for carrying out the present invention can be obtained.
Since the mirror is made of an aluminum material, the bearing body 7a of the bearing member 7A is also preferably made of an aluminum material. In this case, the aluminum material is anodized.
Alternatively, a bearing body 7a and a bearing member body 18 that are integrally formed using the material of the bearing member body 18 may be used.

The third embodiment for carrying out the present invention shown in FIGS. 9 to 11 is mainly different from the best first embodiment for carrying out the present invention in that a bearing member 7B.
Is fixed to the substrate 2, the hub 21 is fixed to the upper outer peripheral portion of the shaft member 4 </ b> A from which the skin layer 17 has been removed, and the rotor case 13 having the polygon mirror 11, the back yoke 8, and the permanent magnet 14 attached to the hub 21. In the point of attachment, even the polygon scanner motor 1B having the gas dynamic pressure bearing configured as described above can obtain the same effects as those of the best first embodiment for carrying out the present invention.

  The fourth embodiment for carrying out the present invention shown in FIGS. 12 to 14 is mainly different from the third embodiment for carrying out the present invention in that the skin of the sliding surface 19 of the bearing member main body 18A. In the point that the bearing member 7C from which the layer 20 is removed is used, even the polygon scanner motor 1C having the gas dynamic pressure bearing formed in this way has the same function and effect as the third embodiment for carrying out the present invention. Is obtained.

The fifth embodiment for carrying out the present invention shown in FIGS. 15 to 17 is mainly different from the second embodiment for carrying out the present invention in that nonmagnetic SUS303 and 304 are used.
The polygon scanner motor 1D having the gas dynamic pressure bearing formed in this way is used in that the shaft member 4C using the bearing and the bearing member 7D using the bearing body 7a formed of bronze sintered metal are used. In addition to the same effects as the second embodiment for carrying out the present invention, it is possible to efficiently prevent adverse effects on the thrust bearing using the magnet. .
In the embodiment of the present invention, the shaft member 4C that has been anodized and the bearing surface of the bearing body 7a formed of an aluminum material are coated with a resin material obtained by kneading a base resin with a slidability improving auxiliary material or a reinforcing material. The bearing member 7D in which the bearing member main body 18 is formed may be used.
Further, a hub may be integrally formed with the bearing member 7D.
Furthermore, a brass metal can be used instead of the bronze sintered metal.

  In each of the embodiments for carrying out the present invention, the polygon scanner motor provided with the gas dynamic pressure bearing has been described. However, the color wheel motor, the fan motor, etc. provided with the gas dynamic pressure bearing other than the polygon scanner motor. It can be used for motors as well.

  INDUSTRIAL APPLICABILITY The present invention is used in an industry for manufacturing motors such as a gas dynamic pressure bearing and a motor for a color wheel including a gas dynamic pressure bearing, a fan motor, and a polygon scanner motor.

The top view of the best 1st form for implementing this invention. Sectional drawing which follows the 2-2 line of FIG. Explanatory drawing of the shaft member of the best 1st form for implementing this invention. Explanatory drawing of the manufacturing process of the shaft member of the best 1st form for implementing this invention. The top view of the 2nd form for carrying out the present invention. Sectional drawing which follows the 6-6 line of FIG. Explanatory drawing of the bearing member of the 2nd form for implementing this invention. Explanatory drawing of the manufacturing process of the bearing member of the 2nd form for implementing this invention. The top view of the 3rd form for carrying out the present invention. Sectional drawing which follows the 10-10 line of FIG. Explanatory drawing of the manufacturing process of the shaft member of the 3rd form for carrying out the present invention. The top view of the 4th form for carrying out the present invention. Sectional drawing which follows the 13-13 line | wire of FIG. Explanatory drawing of the manufacturing process of the bearing member of the 4th form for implementing this invention. The top view of the 5th form for implementing this invention. FIG. 16 is a cross-sectional view taken along line 16-16 in FIG. 15; Explanatory drawing of the bearing member of the 5th form for implementing this invention.

Explanation of symbols

1, 1A, 1B, 1C, 1D: polygon scanner motor with gas dynamic pressure bearing,
2: substrate, 3: shaft fixing member,
4, 4A, 4B, 4C: shaft member, 5: gas dynamic pressure space,
6: Support piece,
7, 7A, 7B, 7C, 7D: bearing member,
8: Back yoke, 9: Coil,
10, 10A: annular member, 11: polygon mirror,
12: Polyhedral mirror presser, 13: Rotor case,
14: permanent magnet, 15: shaft member body,
16: sliding surface, 17: skin layer,
18: Bearing member body, 19: Bearing surface,
20: Skin layer, 21: Hub.

Claims (5)

In a gas dynamic pressure bearing that generates dynamic pressure by relative rotation of a shaft member and a bearing member fitted to the shaft member via a gas dynamic pressure space, and supports the rotation, either of the shaft member and the bearing member One or at least the bearing surface is coated with a resin material kneaded with a slidability improving auxiliary material, and the skin layer of the portion that becomes the bearing surface is removed to expose the slidability improving auxiliary material to the surface. Gas dynamic pressure bearing characterized by that. In a motor, such as a polygon scanner motor, provided with a gas dynamic pressure bearing, the sliding member for improving the slidability is provided on the whole or at least the bearing surface of either the shaft member or the bearing of the gas dynamic pressure bearing of the motor such as the polygon scanner motor. Polygon scanner motors, etc., characterized in that a film is molded with a kneaded resin material, and the skin layer on the bearing surface is removed and the sliding improvement aid is exposed on the surface. motor. In a motor such as a polygon scanner motor provided with a gas dynamic pressure bearing, the whole or at least the bearing surface of either the shaft member of the gas dynamic pressure bearing or the bearing member of the motor such as the polygon scanner motor is provided as an auxiliary material for improving slidability. The resin layer is kneaded with a resin material, and the skin layer on the bearing surface is removed to expose the slidability improving auxiliary material on the surface, and the gas dynamic pressure bearing rotating side is formed. A motor, such as a polygon scanner motor, characterized in that an annular member using a material similar to the polygonal mirror is disposed in a portion where the polygonal mirror is mounted. The whole or at least the bearing surface of the shaft member or bearing member is polyamide, polyacetal, polycarbonate, modified polyphenylene ether, polybutylene terephthalate, polyethylene terephthalate, ultrahigh molecular polyethylene, polysulfone, polyethersulfone, polyphenylene sulfide, polyarylate, polyamideimide, Base resin such as polyetherimide, polyetheretherketone, polyimide, liquid crystal polymer, fluororesin, epoxy, etc., reinforcing material such as carbon fiber and potassium titanate fiber as auxiliary material for improving slidability, graphite, disulfide Lubricants such as molybdenum, tungsten disulfide, fluorine, PTFE, boron nitride, and graphite fluoride, and thermal conductivity of metals such as tin, silver, copper, and nickel, or alloys thereof 4. A motor such as a gas dynamic pressure bearing and a polygon scanner motor according to claim 1, wherein the film is formed by kneading a low melting point metal for improving performance. 4. A motor, such as a polygon scanner motor, according to claim 3, wherein the annular member and the side forming the rotating body of the gas dynamic pressure bearing are fixed or integrally molded with an adhesive.

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