JPH04121037A - Plain bearing device - Google Patents

Abstract

PURPOSE:To prevent a shaft from moving in a bearing and to eliminate skipping of sound and impossibility of regeneration by magnetizing a plain bearing device on either right or left side with respect to an axial direction in the axial direction or substantially in the radial direction. CONSTITUTION:A plain bearing device 2 has a magnetized section 3 which is magnetized on either right or left side with respect to an axial direction in the axial direction and a nonmagnetized section 4. Or, a plain bearing device 5 has a magnetized section 6 which is magnetized at either right or left side with respect to an axial direction in the radial direction and a nonmagnetized section 7. N, S denote magnetizing directions. In both the examples, a bearing shape is formed of a magnetic material adapted for a bearing, and a magnetic field is applied axially or radially to be magnetized. Thus, since either the right or left side of the bearing is magnetized, the shaft formed of the magnetic material is attracted to the magnetized section to be rotated to prevent the shaft from moving in the bearing during rotating.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a sliding bearing device such as a spindle motor for driving a disk of a CD player.

BACKGROUND OF THE INVENTION In recent years, sliding bearing devices have been widely used in audio equipment such as magnetic recorders and optical disk players.

A conventional sliding bearing device will be explained below.

As shown in FIGS. 6 and 7, there is a small clearance between the plain bearing device 1 and a rotating shaft (not shown) supported by the plain bearing device 1. As shown in FIGS.

Problems to be Solved by the Invention However, with the above conventional configuration, when used in a so-called spindle motor, which is a motor that rotates with a disk etc. Due to balance, vibration, and impact, the clearance between the shaft and bearing device is affected during rotation, causing the shaft to touch within the bearing, and self-excited vibrations.Especially in automotive applications, a single vibration can cause sound skipping or self-excitation. This has the problem of causing vibrations and causing troubles such as a continued non-reproducible state.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a sliding bearing device that prevents the shaft from playing within the bearing and eliminates the problem of noise and unreproducible conditions.

Means for Solving the Problem In order to solve this problem, the sliding bearing device of the present invention has the following features:
It has a configuration in which either one of the left and right sides when viewed in the axial direction is magnetized in the axial direction or approximately in the radial direction.

This arrangement allows the shaft to rotate to one side of the bearing without allowing the shaft to play in the bearing.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

(Example 1) As shown in FIGS. 1 and 2, the sliding bearing device 2 includes a magnetized portion 3 and a non-magnetized portion 4, each of which is magnetized on either the left or right side when viewed in the axial direction.

N and S indicate magnetization directions.

(Example 2) As shown in FIGS. 3 and 4, the sliding bearing bag M5 includes a magnetized portion 6 and a non-magnetized portion 7, each of which is magnetized in the radial direction on either the left or right side when viewed in the axial direction. N and S indicate magnetization directions.

In both Examples 1 and 2, a bearing shape is formed using a magnetic material suitable for bearings, and then a magnetic field is applied in the axial or radial direction to magnetize the bearing.

As described above, according to this embodiment, since either the left or right side of the bearing is magnetized, the shaft made of magnetic material can be attracted to the magnetized part side and rotated, and the shaft can be rotated while rotating. Prevent play within the bearing. Further, since there is no need to add a device for pressing the shaft laterally from the outside, space can be saved.

(Embodiment 3) As shown in FIG. 5, the spindle motor 8 is constituted by a two-point sliding bearing device in which a pair of bearings 9 and 10 are aligned in their magnetization positions. 11 is a rotating shaft made of a magnetic material such as stainless steel or bearing steel, and 12 is a tongue table on which a disk 13 is placed and rotated. 14 is a chassis.

As described above, according to this embodiment, the rotary shaft is reliably held by one of the bearings and can rotate, and there is no play within the bearing, so self-excited vibration does not occur and troubles such as inability to reproduce do not occur.

In addition, in the third embodiment, magnetized bearings were used for both the upper and lower pairs, but depending on the magnitude of the required lateral force, it is also possible to use only the upper magnetized bearings (or, depending on the posture of the set and the rotating object). Depending on the mass distribution, the positions of the magnetized parts of the pair of upper and lower magnetized bearings may be shifted by 180 degrees.

Effects of the Invention As is clear from the description of the embodiments, the present invention prevents play within the shaft bearing by magnetizing either the left or right side in the axial direction or approximately in the radial direction. Therefore, it is possible to realize an excellent sliding bearing device that can perform the following steps.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of a sliding bearing device according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line C-C, and FIG. 3 is a conceptual diagram of a sliding bearing device according to a second embodiment of the present invention. , FIG. 4 is a sectional view taken along the line C-C, FIG. 5 is a sectional view of the spindle motor of the disc brayer according to the third embodiment, FIG. 6 is a plan view of the conventional sliding bearing device, and FIG. 7 is a sectional view of the same. It is a CC sectional view. 2... Sliding bearing device, 3... Magnetized part, 4... Non-magnetized part.

Claims (4)

[Claims] (1) A sliding bearing device in which either the left or right side is magnetized in the axial direction. (2) A sliding bearing device in which either the left or right side is magnetized in the radial direction when viewed in the axial direction. (3) A sliding bearing device according to claim 1 or 2, which is a two-point supported sliding bearing device in which the magnetized portions of the pair of sliding bearings are aligned. (4) The sliding bearing device according to claim 1 or 2, wherein the positions of the magnetized portions of the pair of sliding bearings are 180 degrees apart from each other.
Sliding bearing device with two-point support that is offset by °.