JP2008112492A - Manufacturing method of pivot bearing unit for hdd swing arm - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a pivot bearing unit for HDD swing arm having high cleanliness and reliability. <P>SOLUTION: The pivot bearing unit for HDD swing arm is provided with; a nearly cylindrical housing 1; a shaft 2 inserted to the housing 1; rolling bearings 3 and 3 which are interposed between an inner circumference surface of the housing 1 and an outer circumference surface of the shaft 2 and support the housing 1 rotatably to the shaft 2. These rolling bearings 3 and 3 are incorporated between the housing 1 and the shaft 2 while home position preload is given. Nonvolatile coating agent is covered on a tool used for an assembly process and an inspection process of such a pivot bearing unit for HDD swing arm. As the coating agent, fluorine-based oils, such as perfluoropolyether is preferable. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pivot bearing unit (hereinafter referred to as an HDD swing arm pivot bearing) that supports a swing arm on which a magnetic head for reading and writing information is attached in a hard disk drive device (hereinafter also referred to as HDD). It may be referred to as a unit).

Since parts used in the HDD are required to have high cleanliness, the tool used in the process of manufacturing the HDD swing arm pivot bearing unit is also required not to be a source of particles and outgas. Therefore, the jigs are maintained and managed so that oil and dust do not adhere to the surface.
JP 2002-349559 A

However, by assembling the parts of the HDD swing arm pivot bearing unit and inspecting the finished product, dust such as fine metal particles is generated, which adheres to the HDD swing arm pivot bearing unit and is contained in the HDD. Had been pointed out the danger of being brought into the city.
Accordingly, an object of the present invention is to solve the above-described problems of the prior art and to provide a method for manufacturing a pivot bearing unit for an HDD swing arm having high cleanliness and high reliability.

  In order to solve the above problems, the present invention has the following configuration. That is, the manufacturing method of the HDD swing arm pivot bearing unit according to the first aspect of the present invention includes a substantially cylindrical housing, a shaft inserted through the housing, an inner peripheral surface of the housing, and an outer peripheral surface of the shaft. A magnetic bearing for reading / writing information in the hard disk drive device, and a rolling bearing for supporting the housing so as to be relatively rotatable with respect to the shaft. In manufacturing a pivot bearing unit that supports the swing arm so as to be able to swing, a non-volatile coating agent is coated on a tool used in the assembly process and the inspection process.

  According to a second aspect of the present invention, there is provided a method for manufacturing an HDD swing arm pivot bearing unit according to the first aspect, wherein the coating agent is a hard disk of a hard disk drive device. It is characterized by being a fluorinated oil applied to the surface.

  The method for manufacturing a pivot bearing unit for HDD swing arm according to the present invention produces a pivot bearing unit for HDD swing arm that has high cleanliness and high reliability because particles and outgas are less likely to be generated in the assembly process and the inspection process. be able to.

An embodiment of a manufacturing method of a pivot bearing unit for an HDD swing arm according to the present invention will be described in detail with reference to the drawings.
First, the configuration of the HDD swing arm pivot bearing unit will be described with reference to the sectional view of FIG. A pivot bearing unit for an HDD swing arm shown in FIG. 1 includes a substantially cylindrical housing 1 fitted into a hole provided in a swing arm (not shown), a shaft 2 inserted through the housing 1, Rolling bearings 3 and 3 are provided between the peripheral surface and the outer peripheral surface of the shaft 2 and rotatably support the housing 1 with respect to the shaft 2. The rolling bearings 3 and 3 are incorporated between the housing 1 and the shaft 2 in a state where a fixed position preload is applied. The rolling bearings 3 and 3 are filled with a lubricant (not shown) such as grease and lubricating oil. The number of rolling bearings 3 is not particularly limited, but FIG. 1 shows an example in which two rolling bearings are interposed.

  A flange portion 10 extending radially outward is formed at one axial end portion of the shaft 2, and the tip of the flange portion 10 faces the inner peripheral surface of the housing 1. A labyrinth seal 5 is formed by a gap between the tip of the flange portion 10 and the inner peripheral surface of the housing 1. On the other hand, a washer-like seal cap 12 is attached to the other axial end of the shaft 2, and the outer peripheral surface of the seal cap 12 faces the inner peripheral surface of the housing 1. A labyrinth seal 5 is formed by a gap between the outer peripheral surface of the seal cap 12 and the inner peripheral surface of the housing 1.

Next, the process of manufacturing such a pivot bearing unit for HDD swing arm will be described with reference to the process diagram of FIG. First, one of the two rolling bearings 3 and 3 and the housing 1 are fixed with an adhesive, and the other rolling bearing 3 and the shaft 2 are fixed with an adhesive. Next, the two intermediate products obtained as described above are assembled and fixed with an adhesive to form an HDD swing arm pivot bearing unit. At that time, a fixed position preload is applied to the rolling bearings 3 and 3.
When the adhesive is cured by heat treatment under high temperature, the process proceeds to an inspection process, and the characteristics of the pivot bearing unit for HDD swing arm such as assembly accuracy, dimensions, and rotational torque are inspected. Products that pass the inspection are packaged and shipped.

  In the assembly process and the inspection process of the HDD swing arm pivot bearing unit as described above, a jig for holding each component, intermediate product, and finished product is required. Since these jigs and tools are coated with a non-volatile coating agent, even if each part, intermediate product, finished product and the tool are in contact with each other and rubbed, dust such as metal particles is hardly generated. Therefore, in the assembly process of the HDD swing arm pivot bearing unit and the inspection process of the finished product, there is almost no possibility of dust adhering to each component, intermediate product, and finished product. In addition, since the coating agent is non-volatile, there is no possibility that outgas is generated from the tool and the respective parts, intermediate products, and finished products are contaminated. Therefore, it is possible to manufacture an HDD swing arm pivot bearing unit having high cleanliness and high reliability.

The type of coating agent is not particularly limited, but fluorine oil applied to the hard disk surface of the HDD is suitable. Perfluoropolyether is preferable as the fluorinated oil, and specific examples thereof include Fomblin (trade name) manufactured by Solvay Solexis and Demnam (trade name) manufactured by Daikin Industries, Ltd.
In addition, this embodiment shows an example of this invention and this invention is not limited to this embodiment. For example, the rolling bearing 3 incorporated in the pivot bearing unit for the HDD swing arm in FIG. 1 includes a shield and a cage, but does not need to include a sealing device or a cage such as a shield.

In this embodiment, the deep groove ball bearing is exemplified as the rolling bearing incorporated in the HDD swing arm pivot bearing unit. However, the HDD swing arm pivot bearing unit of the present invention includes various types of rolling bearings. Can be incorporated. For example, radial ball bearings, cylindrical roller bearings, tapered roller bearings, needle roller bearings, self-aligning roller bearings and other radial type rolling bearings, and thrust type ball bearings and thrust roller bearings such as thrust roller bearings.
Further, the HDD swing arm pivot bearing unit of this embodiment includes a housing, but the present invention is also applied to a type of HDD swing arm pivot bearing unit that does not include a housing as shown in FIGS. Is possible.

It is sectional drawing of the pivot bearing unit for HDD swing arms. It is process drawing explaining the manufacturing method of the pivot bearing unit for HDD swing arms. It is sectional drawing of the pivot bearing unit for HDD swing arms which shows the modification of this embodiment. It is sectional drawing of the pivot bearing unit for HDD swing arms which shows another modification of this embodiment.

Explanation of symbols

1 Housing 2 Shaft 3 Rolling bearing

Claims (2)

A substantially cylindrical housing, a shaft inserted through the housing, and a fixed position preload applied between an inner peripheral surface of the housing and an outer peripheral surface of the shaft. When manufacturing a pivot bearing unit that includes a rolling bearing that is rotatably supported relative to the hard disk drive device and that supports a swing arm on which a magnetic head for reading and writing information is attached in a swingable manner.
A manufacturing method of a pivot bearing unit for an HDD swing arm, wherein a non-volatile coating agent is coated on a tool used in the assembly process and the inspection process.   2. The method of manufacturing a pivot bearing unit for an HDD swing arm according to claim 1, wherein the coating agent is a fluorinated oil applied to a hard disk surface of a hard disk drive device.

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