JP2003269448A - Bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device in which an outer ring of a rolling bearing is prevented from being misaligned in a radius direction at the time of assembling or tilting in regard to a shaft, in a bearing device assembled by adhering and fixing a swing arm on an outer ring outer diametrical surface of two rolling bearings installed to the shaft so as to make the outer rings thereof butt into each other. <P>SOLUTION: A reinforcing ring 12 is provided on a butting portion of ball bearings 11A, 11B. An outer diametrical surface of the reinforcing ring 12 is fixed on outer ring inner diametrical surfaces of the ball bearings 11A, 11B so as to reinforce the butting portion. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device used as a bearing for a swing arm of a magnetic disk device.

[0002]

2. Description of the Related Art Conventionally, a hard disk drive (HD
The magnetic disk device such as D) uses the magnetic head driving device 1 shown in FIG. 3, for example, to write and read information to and from the magnetic disk 2. The magnetic head driving device 1 includes a swing arm 3 and a bearing unit 5 that supports the swing arm 3 so as to be swingable with respect to a fixed shaft 4, and a magnetic head ( (Not shown) is attached. Further, the magnetic head drive device 1 includes a voice coil motor (not shown) as a drive unit, and when a drive current is supplied to the voice coil motor, the swing arm 3 swings around the fixed shaft 4 as a central axis. I am exercising.

In such a magnetic head driving device, a bearing unit 5 for swingably supporting a swing arm 3 with respect to a fixed shaft 4 is mounted on a fixed shaft 4 as shown in FIG. Rolling bearings 6 and 6 and these rolling bearings 6
Cylindrical housing 7 whose inner surface is fitted to the outer surface of the outer ring
And a bolt 8 for fixing the swing arm 3 to the cylindrical housing 7. Therefore, there are problems that the number of parts is large and the cost is high.

Therefore, as shown in FIG. 5, the width of the inner ring of the rolling bearing 6 is made smaller than the width of the outer ring, and two rolling bearings 6 and 6 are mounted on the fixed shaft 4 with their outer rings butted against each other. A bearing device for use is disclosed in Japanese Patent Application Laid-Open No. 10-318255.

[0005]

According to such a bearing device, since the housing 7 and the bolt 8 shown in FIG. 4 are not required, the number of parts can be reduced and the cost can be reduced. However, since the bearing device disclosed in the above publication is assembled by bonding and fixing the swing arm 3 to the outer ring outer diameter surface of the rolling bearing 6, the outer ring of the rolling bearing 6 is displaced in the radial direction by the contracting force of the adhesive. May occur or may be tilted with respect to the shaft, and as a result, there is a problem in that torque fluctuations and radial rigidity vary.

The present invention has been made in view of the above problems. An object of the present invention is to provide a swing arm on the outer diameter surface of the outer ring of two rolling bearings which are mounted on a shaft with outer rings butted against each other. Provided is a bearing device which is assembled by adhesively fixing the bearing device, which can prevent the outer ring of the rolling bearing from being displaced in the radial direction or tilted with respect to the shaft due to the contracting force of the adhesive. Especially.

[0007]

In order to achieve the above-mentioned object, the present invention provides two rolling bearings mounted on a shaft with outer rings butted against each other, and these rolling bearings allow the rolling bearings to swing relative to the shaft. In a bearing device comprising a swing arm movably supported and assembled by adhering and fixing the swing arm to an outer ring outer diameter surface of the rolling bearing, a reinforcing ring is provided at a butting portion of the rolling bearing, and the reinforcing ring is provided. A ring is fixed to the inner diameter surface of the outer ring of the rolling bearing to reinforce the abutting portion.

According to this structure, the abutting portion of the rolling bearing is reinforced by the reinforcing ring. Therefore, when the swing arm is adhered and fixed to the outer ring outer surface of the rolling bearing to assemble the bearing device, the adhesive agent It is possible to prevent the outer ring of the rolling bearing from being displaced in the radial direction or tilted with respect to the shaft due to the contracting force. In the bearing device according to the present invention, the reinforcing ring is preferably formed of stainless steel as in the invention according to claim 2. With such a configuration, the corrosion resistance of the reinforcing ring can be enhanced. .

According to the third aspect of the invention, a ring-shaped fitting portion for fitting the reinforcing ring into the shield plate mounting groove of the rolling bearing, and an inner diameter of the rolling bearing from the inner peripheral surface of the fitting portion. Alternatively, the reinforcing ring may have the function of a shield plate.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. In FIG. 1, the bearing device according to the embodiment of the present invention includes a swing arm 3 and a bearing unit 10 that swingably supports the swing arm 3 with respect to a fixed shaft 4. A magnetic head (not shown) is attached to the tip.

The bearing unit 10 includes two ball bearings 11 mounted on the fixed shaft 4 with the outer rings 11a, 11a butted against each other.
A and 11B are provided, and the swing arm 3 has a ball bearing 1
It is adhered and fixed to the outer diameter surface of the outer ring of 1A, 11B. The bearing unit 10 also includes a reinforcing ring 12 that reinforces the abutting portions of the ball bearings 11A and 11B. The reinforcing ring 12 is formed of, for example, stainless steel, and the outer diameter surface of the reinforcing ring 12 is fixed to the inner diameter surfaces of the outer races of the ball bearings 11A and 11B by a method such as bonding or press fitting. The reinforcing ring 12 is a ring-shaped fitting portion 12 that fits in the shield plate mounting groove 11b of the ball bearings 11A and 11B.
a and the ball bearings 11A, 1 from the inner peripheral surface of the fitting portion 12a.
1B and a ring-shaped protruding portion 12b protruding in the inner diameter direction of 1B, and this protruding portion 12b serves as a shield plate 13.

As described above, the reinforcing ring 12 is provided at the abutting portion of the ball bearings 11A and 11B.
When the outer surface of the ball bearings 11A and 11B is fixed to the inner surface of the outer ring of the ball bearings 11A and 11B, the abutting portions of the ball bearings 11A and 11B are reinforced by the reinforcing ring 12. As a result, when the swing arm 3 is bonded and fixed to the outer ring outer diameter surfaces of the ball bearings 11A and 11B to assemble the bearing unit 10, the outer ring 11a of the ball bearings 11A and 11B is displaced in the radial direction by the contracting force of the adhesive. It is possible to prevent the swing arm 3 from tilting or tilting with respect to the fixed shaft 4, and the swing arm 3 can be swung with high precision with respect to the disk surface of the magnetic disk 2.

Further, since the reinforcing ring 12 is made of stainless steel, the corrosion resistance of the reinforcing ring 12 can be enhanced. Further, the reinforcing ring 12 is attached to the ball bearing 11
A ring-shaped fitting portion 12a fitted into the shield plate mounting groove 11b of A and 11B, and a ring-shaped protruding portion 12b protruding from the inner peripheral surface of the fitting portion 12a in the inner diameter direction of the ball bearings 11A and 11B. Because it is composed of
Can have the function of the shield plate 13.

In the above-described embodiment, the reinforcing ring 1 is provided so that the reinforcing ring 12 has the function of the shield plate 13.
2 is a ring-shaped fitting portion 12a for fitting the ball bearings 11A and 11B in the shield plate mounting groove 11b, and the fitting portion 12a.
The ring-shaped protruding portion 12b protruding from the inner peripheral surface of the ball bearings 11A and 11B in the inner diameter direction of the ball bearings 11A and 11B is not limited to this. For example, a reinforcing ring 12 having a shape as shown in FIG. The ball bearings 11A and 11B may be used to reinforce the abutting portions.

Further, in the above-described embodiment, the ball bearings 11A, 11 are used as the two rolling bearings mounted on the fixed shaft 4.
Although B is used, it is not limited to the ball bearing, and a roller bearing may be used instead of the ball bearing. Further, although the reinforcing ring 12 is formed of stainless steel in the above-described embodiment, for example, the reinforcing ring 12 may be formed of bearing steel or steel for general structural use. Furthermore, bearing steel, stainless steel, or the like may be used as the material forming the outer ring and the inner ring of the ball bearing 11.

[0016]

As described above, according to the present invention,
Since the abutting part of the rolling bearing is reinforced by the reinforcing ring, when the swing arm is bonded and fixed to the outer surface of the outer ring of the rolling bearing to assemble the bearing device, the outer ring of the rolling bearing moves in the radial direction due to the contracting force of the adhesive. It is possible to prevent the position shift from occurring and the inclination with respect to the axis.

[Brief description of drawings]

FIG. 1 is a sectional view of a bearing device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a bearing device according to another embodiment of the present invention.

FIG. 3 is a diagram showing a magnetic head driving device of a magnetic disk device.

FIG. 4 is a diagram showing a first conventional example used as a bearing for a swing arm of a magnetic disk device.

FIG. 5 is a diagram showing a second conventional example used as a swing arm bearing of a magnetic disk device.

[Explanation of symbols]

2 magnetic disk 3 swing arms 4 fixed axis 10 Bearing unit 11A, 11B ball bearings 11a outer ring 11b Shield plate mounting groove 12 Reinforcement ring 12a fitting part 12b protrusion 13 Shield plate

Claims (3)

[Claims] 1. A rolling bearing comprising: two rolling bearings mounted on a fixed shaft with outer rings butted against each other; and a swing arm rotatably supported by the rolling bearings on the fixed shaft. In the bearing device assembled by adhesively fixing the swing arm to the outer ring outer diameter surface of the rolling bearing, a reinforcing ring is provided at the butting portion of the rolling bearing, and the reinforcing ring is fixed to the outer ring inner diameter surface of the rolling bearing. A bearing device in which a mating portion is reinforced. 2. The bearing device according to claim 1, wherein the reinforcing ring is made of stainless steel. 3. A ring-shaped fitting portion for fitting the reinforcing ring into a shield plate mounting groove of the rolling bearing, and a ring-shaped fitting portion projecting from an inner peripheral surface of the fitting portion in an inner diameter direction of the rolling bearing. The bearing device according to claim 1, wherein the bearing device comprises a protrusion.