JPS62100155A - Disk drive motor - Google Patents

Abstract

PURPOSE:To strengthen a housing, and to stop the deformation of the housing due to the imbalance of a rotational system by arranging a sleeve manufactured by a material having an elastic modulus larger than the housing between the housing and a bearing for a shaft. CONSTITUTION:A bearing 5 is mounted to a housing 2, and a shaft 6 for turning a disk is supported. A sleeve 10 manufactured by a material having an elastic modulus larger than a housing material is disposed between the housing 2 and the bearing 5 at that time. Accordingly, the quantity of the housing 2 deformed can be inhibited, thus reducing displacement between a track for the disk and a head.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk drive motor that rotates a disk-shaped information recording medium such as a magnetic disk.

[Conventional technology]

FIG. 4 is a sectional view of a conventional disk drive motor disclosed in, for example, Japanese Patent Application Laid-Open No. 59-144853. In the figure, (1) is the mounting board, (2) is the mounting board (1)
(3) is a stator core fixed to the housing (2), (4) is a stator coil wound around the stator core (3), and (5) is fitted into the housing (2). (6) is the stainless steel rotating shaft supported by the housing (2) via the bearing (5), (7) is the rotor yoke fixed to the rotating shaft (6), and (8) is the stator core. A rotor magnet (3) is fixed to the rotor yoke (7) facing the rotor magnet, and (9) is a hub fixed to the rotating shaft (6), which fixes a disk (not shown). In addition, in order to reduce the relative displacement between the track frt and the groove on a disk where high-density recording is performed, one of the measures is to reduce thermal expansion by composing the component parts with the same material. Aluminum is used as a component in the nickel acid, which is designed to reduce the impact.

Next, the operation will be explained. By exciting the stator coil (4), torque is generated between the rotor magnet (8) and the stator core (3), and the rotating shaft (6) rotates.

[Problem that the invention seeks to solve]

Conventional disk drive motors are constructed as described above, so if there is an imbalance in the motor's rotation system, the aluminum housing, which has a small elastic modulus, will deform. When the head is positioned as shown in FIG.

Furthermore, in recent cases where a plurality of I7> disks are mounted, the rotating shaft becomes longer, and the housing also becomes longer, which increases the degree of influence.

The present invention has been made to solve the above problems, and provides a disk drive motor that can prevent deformation of the housing due to unbalance of the motor's rotation system.

[Means for solving problems]

A disk drive motor according to the present invention has a sleeve made of a material having a higher elastic modulus than the housing, and is disposed between the housing and the bearing of the rotating shaft.

[Effect]

In the disk drive motor of the present invention, since the housing is reinforced with the sleeve, deformation of the housing can be prevented.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (1) to (9) are the same as the conventional one. αO is a sleeve fitted between the housing (2) and the bearing (5), and is made of a material with a larger elastic modulus than the material of the housing (2).
If 2) is made of aluminum, use stainless steel or the like for the sleeve αO.

In the above configuration, a disk (not shown) is attached to the hub (9).
Attach and rotate. At this time, even if an unbalance occurs in the rotation system, the rigidity of the housing (2) is strengthened, so
Deformation of the housing (2) with reference to the mounting board (1) can be suppressed.

In the above embodiment, the mounting board (1) is attached to the housing (2).
), but if the mounting board (1) is fixed to the center of the housing (2) as shown in FIG. 2, the amount of deformation can be further suppressed.

Furthermore, as shown in FIG. 3, a collar (1ta) may be provided on the outer periphery of the sleeve αη, and the housing part may be integrated with the mounting board (2) by the Gui casting method. Also in FIGS. 1 and 2, the sleeve may be provided with a collar to form an integral structure.

Further, in the above embodiments, the sleeve is made of stainless steel, but the same effect can be expected if the sleeve is made of a material having a higher elastic modulus than the housing material.

〔Effect of the invention〕

According to this invention, by disposing a sleeve made of a material with a higher elastic modulus than the material of the housing between the housing and the bearing, the amount of deformation due to nosing can be suppressed, so that the disk track and head The difference between the two can be reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of this invention, FIGS. 2 and 3 are sectional views showing other embodiments of this invention, respectively.
FIG. 4 is a sectional view of a conventional disk drive motor. In FIG. 5, (2) is a housing, (5) is a bearing, (6) is a rotating shaft, (7) is a rotor yoke, and α0 is a sleeve. In addition, the same symbols in each figure indicate the same or corresponding parts.

Claims (2)

[Claims] (1) In a device in which a rotating shaft to which a rotor yoke is fixed is supported by a bearing in a housing, and a disk is rotated by the rotating shaft, a material having a higher elastic modulus than the material of the housing is used between the housing and the bearing. A disk drive motor characterized by having a sleeve made up of. (2) The disk drive motor according to claim 1, wherein the sleeve has a collar projecting on the outer periphery, and is cast integrally with the housing so that the collar is embedded within the housing. .