JPH05184100A - Hermetic seal structure at opening of spindle motor - Google Patents

Abstract

PURPOSE:To block dust, produced in a bearing or the like, from flowing out to the outside by employing a hermetic structure comprising a seal covering the outer side face of a bearing and a spacer for spacing the seal apart the outer side face. CONSTITUTION:Dust produced through rotation of a rotor 19 is confined in the rotor 19 and bearings 17, 18 by means of a labyrinth structure 14 and a hermetic structure 30 and blocked from flowing to the outside of a spindle motor 10. The hermetic structure 30 comprises a seal 31 covering the outer side face 181 of the bearing 18 and a disc spacer 32 interposed between the seal 31 and the bearing 18 to space apart the seal 31 and the outer side face 181. Consequently, the seal 31 does not adhere to the outer side face of the bearing 18 which can thereby rotate with no trouble. According to the constitution, dust is blocked from flowing into other dust-free unit which is thereby protected against deterioration of performance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for sealing an opening hole in a spindle motor which accommodates a bearing for rotatably supporting a rotor.

[0002]

2. Description of the Related Art Conventionally, there is a motor generally called a spindle motor which is mainly used for rotating a disk (magnetic disk, optical disk) or the like. This spindle motor has an opening hole that accommodates a bearing that rotatably supports the rotor.

[0003]

However, when such a spindle motor is incorporated in a disk drive device and attached to an information processing device which does not like dust, for example, dust generated in a bearing or in a spindle motor The generated dust flows into the information processing device from the opening, and the performance of the information processing device is degraded.

[0004]

According to the present invention, in a spindle motor having an opening hole in which a bearing for rotatably supporting a rotor is housed, a seal for covering an outer side surface of the bearing, the seal and the outer side are provided. The above-mentioned problems are solved by a hermetic structure including a spacer provided between the side surface and the side surface for separating the seal from the outer side surface.

[0005]

The dust, which is generated in the bearing or the spindle motor, is prevented from flowing out by the seal even if it tries to flow out from the opening. Moreover, the seal is separated from the outer side surface of the bearing by the spacer so as not to adhere to the outer side surface of the bearing.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. The spindle motor 10 is a disk drive device 11
And has a frame 13 attached to the base 12 of the disk drive device 11. The disk drive device 11 is provided in an information processing device (not shown). Opposing surfaces 121, 191 of the base 12 and a rotor 19 described later
Form a labyrinth structure 14 with a narrow gap and a wide space to face each other.

A cylindrical support cylinder 15 is formed integrally with the frame 13. An armature 16 is provided on the support cylinder 15. Further, a pair of bearings 17 and 18 are provided in the opening hole 151 of the support cylinder 15. The shaft portion 20 of the rotor 19 is press-fitted into the bearings 17 and 18. The rotor 19 has a ring-shaped permanent magnet 21 facing the armature 16. The disk D is mounted on the head of the rotor 19.

On the lower surface of the frame 12, there is formed a sealing structure 30 which covers the outer side surface 181 of the one bearing 18 and seals the opening hole 151. The closed structure 30
A seal 31 that covers the outer side surface 181 of the bearing 18.
And a disk-shaped spacer 32 that is interposed between the seal 31 and the bearing 18 and separates the seal 31 from the outer side surface 181. The spacer may have a ring shape. An adhesive is applied to the surface of the seal 31, a spacer 32 is attached, and the edge 31
The portion 1 is attached to the frame 13. Seal 31
Is made of a polyester film on which aluminum is vapor-deposited, and the spacer 32 is made of a rigid metal such as stainless steel.

Since the seal 31 is separated from the outer side surface 181 of the bearing by the spacer 32, it does not adhere to the outer side surface 181 of the bearing 18. Therefore, in the hermetic structure 30, the seal 31 does not adhere to the bearing 18 and hinder the rotation of the bearing 18.

Next, the operation will be described. The rotor 19 of the spindle motor 10 is rotated by the magnetic action of the permanent magnet 21 and the armature 16 to rotate the mounted disk D. The rotating disk D is a magnetic head (not shown).
Approaches and the stored information is read. Depending on the rotation of the rotor 19, the inside of the rotor 19 or the bearing 1
Dust is generated in the inside of 7, 18. However, the generated dust is generated by the labyrinth structure 14 and the closed structure 30.
It is confined inside the rotor 19 and the bearings 17, 18 and does not flow out of the spindle motor 10.

[0011]

The closed structure of the opening hole of the spindle motor according to the present invention prevents the dust generated in the bearing or the spindle motor from flowing into another device (for example, an information processing device) which does not like the dust. Because you can
It is possible to prevent performance deterioration of other devices. Further, since the seal is separated from the outer side surface of the bearing by the spacer and does not adhere to the outer side surface of the bearing, it does not hinder the rotation of the bearing.

[Brief description of drawings]

FIG. 1 is a front cross-sectional view of a spindle motor having a hermetically sealed structure according to the present invention.

[Explanation of symbols]

 10 Spindle Motor 17, 18 Bearing 19 Rotor 30 Sealed Structure 31 Seal 32 Spacer 151 Opening Hole 181 Side Side of Bearing Outside

Claims (1)

[Claims] 1. A spindle motor having an opening hole in which a bearing for rotatably supporting a rotor is accommodated. A seal for covering an outer side surface of the bearing, and a seal provided between the seal and the outer side surface are provided. A hermetically sealed structure for an opening hole of a spindle motor, comprising: a spacer for separating a seal from the outer side surface.