JP2002213470A - Rolling bearing device - Google Patents

Abstract

(57) [Summary] An object of the present invention is to provide a rolling bearing device in which moment rigidity, that is, a resonance point is stable, by eliminating variations in contact point span due to deformation. A pivot portion (1) and an E-block (9) are fastened by providing a lip (12) at an upper end of an E-block (9) and caulking and fixing at least three of the lip portions (12) to a pivot end (6).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing device suitable for use in a portion that swings at a high speed and minutely, such as a bearing device for a swing arm in a magnetic disk drive.

[0002]

2. Description of the Related Art For example, in a conventional swing arm bearing device, as shown in FIGS. 5 to 8, grease-sealed rolling ball bearings 100, 100 are used with a preload applied thereto. A bolt 400 is screwed into the outer diameter 301 and the housing 300 is pulled to fasten and fixed to the E-block 200 having the arm integrally formed. FIG. FIG. 7 shows the housing outer diameter 301 and the E-block inner peripheral surface 2.
8 is a type in which a corrugated steel plate press-fit ring 500 is attached to the housing outer diameter 301.
And the ring 500 and the E block 200 are press-fitted and fixed.

[0003]

Recently, there has been a demand for higher density magnetic disk drives. For this reason, the width of the track for recording signals on the disk is becoming increasingly narrower, and the swing arm equipped with a head for recording and reproducing signals has faster access to the target track and higher positioning performance. Is required. Therefore,
In order to satisfy high-speed control and high-precision control, high rigidity is required for a rolling ball bearing that supports a swing arm.

However, as shown in FIG. 5, the arm (E-block) 200 connects the housing 300 to the E-block 2 via a bolt 400 at a central portion of the housing outer diameter 301.
00 side, housing 300 and E-block 20
0 is in contact with the housing.
Due to the deformation of the bolts 400 of the arm inner surface 201 and the inner peripheral surface 201 due to the fastening force, two-point contact was made in the axial direction, and the span between the two points also varied. In particular, when the span between two points is short, the moment stiffness is reduced, and the resonance of the swing arm is reduced, that is, the positioning performance is deteriorated.

In the case of the pressing type as shown in FIG. 6, the above problem is in the direction of improvement, but the same problem still remains. The adhesive fixing type shown in FIG. 7 has a problem of outgassing together with the above problem. Further, in the case of FIG. 8, there is a problem of increased cost due to an increase in the number of parts and contamination due to abrasion at the time of press fitting.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to eliminate the variation of the contact point span due to the above-mentioned deformation and to provide a moment rigidity, that is, resonance. An object of the present invention is to provide a rolling bearing device having a stable point.

[0007]

In order to achieve the above object, the present invention provides a technical means in which an E block is connected to a pivot rotatably supported by a rolling bearing with respect to a fixed shaft. The block is provided with an axially protruding lip at at least one end thereof, and at least three or more of the lips are bent and crimped to the pivot end to be joined.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the rolling bearing device of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment, FIG. 3 shows a second embodiment, and FIG. 4 shows a third embodiment. In each embodiment, an E block (swing arm) 9 is rotatably supported by a pivot 1. HDD (Hard
1 is an embodiment of a bearing device of a swing arm for a magnetic disk device such as a Disk Drive. Note that the present embodiment is merely a specific form described for describing an embodiment of the rolling bearing device of the present invention, and is not particularly interpreted as being limited thereto, and other forms are appropriately included within the scope of the present invention. Can be selected and set.

[First Embodiment] In a pivot 1, two rolling bearings (ball bearings) 3 and 4 are bonded or press-fitted and fixed to a shaft 2, and a spacer 7 is provided between outer rings 3a and 4a. Is provided. The outer diameter 8 of the spacer 7 is smaller than the outer diameter 5 of the outer ring, and a slight clearance is provided between the outer diameter 5 of the outer ring and the inner diameter 10 of the E block 9. In addition, rolling bearings 3, 4
The configuration of the spacer 7 is not particularly limited in the present embodiment, and can be arbitrarily designed.

The E block 9 has an inner step 11 at its lower part.
The inner diameter step (stepped portion) 11 is provided with a pivot 1
The outer ring 4a of the lower bearing 4 is abutted. The E block 9 is provided at its upper end with a plurality of lip portions 12 extending in the axial direction. The material of the E block 9 is
Although not particularly limited, an aluminum alloy that can be easily bent can be cited as a typical example.

The lips 12 extend from the upper end of the E block 9 with a desired axial length, and are provided in plural numbers at desired intervals in the circumferential direction. Several portions of the lip 12 are bent by the die 14 in the direction of the inner diameter 10 of the E block 9 and pressed against the end (pivot end) 6 of the outer race 3a (FIGS. 2A and 2B). The outer ring 3a
It is preferable to insert a relief 13 in order to suppress the deformation of (FIG. 2A).

In order not to increase the bending force at the time of crimping when fastening and fixing by crimping, it is desirable that the lip portion 12 be crimped at three or more places. Also, lip 1
The radial thickness of 2 is preferably about 0.2 to 2 mm,
When the thickness is more than 2 mm, the bending force at the time of caulking becomes large, and the outer ring is deformed. That is, the outer ring groove is deformed, which causes torque fluctuation. It is desirable that the amount of protrusion of the lip portion 12 in the axial direction and the number of fastening points be designed so that the pivot 1 does not fall out of the E block 9 due to an impact at the time of swaging (partial swaging).

In this embodiment, the lip 12 provided at the upper end of the E-block 9 is swaged, and the outer ring 4a of the lower bearing 4 of the pivot 1 is received by the stepped portion 11 provided at the lower part. However, a stepped portion 11 may be provided at the upper portion of the E block 9 and a lip portion 12 may be provided at the lower portion for caulking.
2 may be provided and caulked and fastened, which is within the scope of the present invention.

In order to make the caulking uniform, the entire circumference of the lip portion 12 may be caulked, which is within the scope of the present invention. FIG. 2 (c) shows an example of the case of full-round caulking. However, except for the configuration in which the lip portion 12 is formed on the entire circumference, it is the same as the case of partial caulking. Description is omitted. In addition, a configuration in which a relief 13 for suppressing deformation of the outer ring shown in FIG. Further, even in the case of caulking around the entire circumference, the caulking may be performed by providing lip portions 12 at both upper and lower ends.

According to the structure as in the present embodiment, there is no housing and the number of parts is reduced, so that the cost is reduced.

As described above, at least one end of the E block 9 is provided with the lip portion 12 protruding in the axial direction, and at least three or more portions of the lip portion 12 are bent and crimped to the outer ring end portion 6. As a result, variation in rigidity (resonance) can be reduced, and moment rigidity can be increased. Further, since the pivot 1 is fixed at both ends in the axial direction, the inclination of the rolling ball bearing can be reduced, and the torque fluctuation can be reduced. Further, since no adhesive is used, outgas can be reduced.

"Second Embodiment" In this embodiment, the spacer 7 is not used between the outer rings 3a, 4a as in the first embodiment, but is provided by directly contacting the upper and lower outer rings 3a, 4a. (Fig. 3). In order to apply a preload, it is made narrower than the inner ring width. Other configurations and operation effects are the same as those of the first embodiment.

[Third Embodiment] In this embodiment, a housing 15 is provided on the outer ring outer diameter portion 5, and the lip portion 12 of the E block 9 is fixed to the housing end portion (pivot end portion) 16 by caulking and fastening. (FIG. 4). A well-known configuration is appropriately selected and used for the housing 16 within the scope of the present invention, and is not particularly limited. Other configurations and operation effects are the same as those of the first embodiment.

[0019]

Since the present invention has the above-described structure, the rigidity (resonance) and the moment rigidity can be prevented from decreasing and varying without variation in the contact span, and the positioning performance can be improved with high accuracy. Since there is no need to machine bolt surfaces, omit bolts, or press-fit a corrugated steel plate ring, it can be produced at low cost.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a rolling bearing device of the present invention.

FIG. 2 is an enlarged view of a main part.

FIG. 3 is a longitudinal sectional view showing a second embodiment.

FIG. 4 is a longitudinal sectional view showing a third embodiment.

FIG. 5 is a longitudinal sectional view of a prior art showing bolting fixation (pull type).

FIG. 6 is a longitudinal sectional view of a prior art, showing bolting fixation (pressing type).

FIG. 7 shows an adhesive fixation in a longitudinal section view of the prior art.

FIG. 8 shows a press-fit ring fastening fixation in a longitudinal section view of the prior art.

[Explanation of symbols]

 1: Pivot 2: Shaft 3, 4: Rolling bearing 5: Outer diameter 6: End 9: E block (swing arm) 12: Lip 15: Housing

Claims (1)

[Claims] An E-block is coupled to a pivot rotatably supported by a rolling bearing with respect to a fixed shaft, and the E-block is provided with an axially projecting lip at at least one end thereof. A rolling bearing device characterized in that at least three or more lip portions are bent and crimped to pivot ends to be joined.