KR100585889B1 - Motor for using oil stopper for bearing - Google Patents

Abstract

Since the thrust bearing on which the end of the rotating shaft is supported is mounted to a part of the housing through the permanent magnet, the length in the rotating shaft direction is longer by that length, which hinders miniaturization. In addition, when the oil stopper is installed on the bearing along the rotational axis, this also causes the length of the rotational axis direction to be longer, thus causing further miniaturization.

The stator coil 8 is fixedly installed on the outer circumference of the bearing housing 2, and the rotor 9 is fixed to the rotation shaft 4. The rotor 9 consists of a hollow cylinder cut out of a magnetic body, and the ring magnet 10 is fixed to the inner periphery of the open end side by the press-fitting or bonding against the stator coil 8. In addition, the oil stopper 11 including the permanent magnet material is fixed to the inner circumference opposite to the rotor of the bearing housing 2 by press-fitting, bonding, or the like while maintaining a slight gap with respect to the rotation shaft 4.

Description

Motor for oil stopper for bearings {Motor for using oil stopper for bearing}

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing of the principal part of the motor which shows 1st Embodiment.

2 is a sectional view showing the main parts of a second embodiment.

3 is a sectional view showing the main parts of the third embodiment.

<Short description of symbols>

9 rotor

11, 13 oil stopper

12 magnetic material

14 permanent magnets

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to parts used in equipment that handles information, images, and the like of CDs, DVDs, printers, and copiers, and to motors using the parts.

In a CD or a DVD, disc-shaped media in which music information and image information are recorded on a surface is rotated by a motor, and a pickup corresponding to the information is read out to convert a signal according to the information into audio or video. Since the media are detachably mounted on the turntable, and the turntable is normally fitted to one end of the rotational shaft of the motor, the media is integrated with the turntable and driven to rotate at high speed when the motor is energized.

Since the media and turntables are generally made of synthetic resin, when the media are formed in a plate shape or when the turntable mounting hole is formed in a disk shape when the turntable mounting hole is formed at the rotation center thereof, the center position in the plane direction may be deviated from the rotation center. Similarly, the turntable on which the media is placed may likewise shift the center position in the plane direction from the rotation center.

In any case, if the off-centered media or turntable in which the rotation center and the center position do not coincide in this way are rotated at high speed, vibration occurs in the rotation axis direction or the plane direction, and an accurate signal according to the information recorded on the media is generated. You will not be able to read it.

Therefore, the rotating shaft of the motor is usually made of magnetic material such as steel, the turntable is inserted through one end of the rotating shaft, and the other end of the rotating shaft is sucked by a permanent magnet installed in a corresponding place of the housing, and the turntable is driven to rotate at high speed. When forced to suppress vibration.

However, since the end of the rotating shaft is supported by the thrust bearing and the thrust bearing is mounted to a part of the housing via the permanent magnet, the length in the direction of the rotating shaft becomes that long, which hinders miniaturization.

In addition, since the oil contained in the bearing is scattered to the periphery when the rotating shaft is driven to rotate at high speed, the oil stopper prevents the scattering of the oil. Since it lengthens, it will cause further miniaturization.

Accordingly, an object of the present invention is to forcibly suppress vibrations generated during high speed rotation of the turntable, and, in another object, to prevent oil from scattering and to miniaturize it.

The present invention provides the oil stopper for the bearing by providing the magnetic stopper to the oil stopper provided at the bearing end and surrounding the rotating shaft.

Moreover, the bearing oil stopper which gave the oil stopper magnetic property was provided in the bearing end part, and it was set as the bearing which rotatably supports a rotating body.

In addition, the oil stopper includes a permanent magnet material and at the same time an area opposite the bearing end of the rotor comprises a magnetic material, or the oil stopper includes a magnetic material and at the same time an area opposite the bearing end of the rotor is a permanent magnet. It was made with the motor containing a material.

The oil stopper is a fluorine-based oil barrier treatment.

Therefore, since the oil stopper has magnetic properties, it is possible to obtain a bearing having a long length and to assemble a motor which can be miniaturized by using this bearing.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing of the principal parts of the motor which shows 1st Embodiment which concerns on this invention. In addition, it demonstrates here as a brushless motor which used the rotating shaft as the output stage. In Fig. 1, a bearing housing 2 containing oil is provided in a metal base 1, and a bearing 3 is fitted into the inner circumference of the bearing housing 2 by press-fitting or the like. The rotating shaft 4 is rotatably supported. One end of the rotary shaft 4 serves as an output stage, and a turntable 5 for placing media on the output stage is provided, and the other end of the rotary shaft 4 is regulated in the axial direction by the thrust bearing 6. The thrust bearing 6 is fixed to the bottom plate 7, and the bottom plate 7 is coupled to the bottom of the bearing housing 2 by screws or press fittings. The stator coil 8 is fixedly installed on the outer circumference of the bearing housing 2, and the rotor 9 is fixed to the rotation shaft 4. The rotor 9 consists of a hollow cylinder cut out of a magnetic body, and the ring magnet 10 is fixed to the inner periphery of the open end side by the press-fitting or bonding against the stator coil 8.

In addition, the oil stopper 11 including the permanent magnet material is fixed to the inner circumference opposite to the rotor of the bearing housing 2 with respect to the rotational shaft 4 slightly by pressing or bonding. In addition, the oil stopper 11 may shape each fine powder of a permanent magnet material and a synthetic resin material on predetermined conditions, and may fix it to the bearing 3 as a part of the housing 2. Therefore, the housing 2 and the bearing 3 are collectively referred to as a bearing.

When electric power is supplied to the stator coil 8 by a control apparatus (not shown), the motor comprised in this way attracts and repels the ring magnet 10 which opposes a stator coil, and the rotor 9 is driven to rotate rotationally, and a rotating shaft The turntable 5 integrated with (4) is also rotationally driven.

When the rotary shaft 4 is driven to rotate at high speed, the oil stopper 11 including the permanent magnet material fixed to the bearing housing 2 is fixed even if the turntable 5 is out of center. Since the area | region facing 11 is attracted by magnetic force, and the rotating shaft 4 with the rotor 9 fixed is sucked in the direction of the thrust bearing 6, the rotating shaft 4 is high speed, without deviating from the axial center direction. Continue to turn Therefore, the turntable 5 is rotated at a high speed by suppressing vibration. In addition, the rotor can obtain the same effect even if only the region facing the oil stopper is the region having the characteristics of the magnetic body.

In addition, when the rotating shaft 4 rotates at a high speed, oil is transferred from the bearing 3 to the rotating shaft 4 and tries to scatter, but is blocked by the oil stopper 11.

2 is a sectional view showing the main parts of a second embodiment according to the present invention. In this embodiment, the magnetic body 12 formed in the disk shape is fixed to the periphery of the rotation shaft 4 of the rotor 9 by adhesion | attachment, etc., and is arrange | positioned facing the oil stopper 11. Therefore, since the rotor 9 does not need to be a magnetic body, it becomes possible to comprise a suitable material as a rotating body with an appropriate thickness. The other elements have the same structure as that of the first embodiment shown in FIG. In addition, the magnetic body 12 can utilize the suction force by this permanent magnet effectively, if the surface direction dimension is enlarged with respect to the oil stopper 11 containing the permanent magnet fixed to the housing 2.

3 is a sectional view showing the main parts of a third embodiment according to the present invention. In this embodiment, the oil stopper 13 including the permanent magnet is fixed to the housing 2, and the permanent magnet 14 formed in a disc shape is fixed to the periphery of the rotation shaft 4 of the rotor 9 by bonding or the like. And it is arrange | positioned facing this oil stopper 13. Therefore, since the rotor 9 does not have to be a magnetic body, it is possible to constitute a suitable material with an appropriate thickness as the rotating body, and furthermore, since the oil stopper 13 only needs to be a magnetic body, the material selection capable of exhibiting characteristics as an oil stopper is selected. This is facilitated. The other elements have the same structure as that of the first embodiment shown in FIG.

In addition, although each embodiment was demonstrated as the brushless motor which used the rotating shaft as the output stage, even the motor with a fixed shaft or a brush can be comprised like this invention.

When the oil stopper contains a fluorine-based oil repellent, the effect of preventing the scattering of oil coming out of the bearing as an oil stopper can be increased.

Since the oil stopper for bearings according to the present invention, the bearing and the motor using the stopper are configured as described above, a bearing whose length is restricted by an oil stopper having magnetic characteristics can be obtained, and furthermore, this bearing is used. Thus, a motor that can be miniaturized can be assembled.

Specifically, the following effects can be obtained.

If the rotor is made of a metal having magnetic properties and the permanent magnet material is included in the oil stopper, the rotor is attracted to the oil stopper side, so no special suction means is necessary.

When a magnetic body or a permanent magnet is fixed to a part of the rotor, the rotor is attracted to the oil stopper side, so that no special suction means is necessary, and a suitable material as a rotating body can be formed to an appropriate thickness.

Claims (11)

delete delete delete delete delete delete delete In a motor for rotatably supporting a rotating shaft mounted on a rotor with a bearing, An oil stopper including a permanent magnet material is disposed at an end of the bearing housing so as to surround the axis of rotation, and the region of the rotor opposite the bearing end comprises a magnetic material. In a motor for rotatably supporting a rotating shaft mounted on a rotor with a bearing, An oil stopper including a permanent magnet material is disposed at an end of the bearing housing so as to surround the axis of rotation, and the region of the rotor opposite the bearing end comprises a permanent magnet material. In a motor for rotatably supporting a rotating shaft equipped with a rotor with a bearing, At the end of the bearing housing an oil stopper comprising a permanent magnet material is arranged to surround the axis of rotation, the rotor region opposite the bearing end comprising a permanent magnet material, The oil for bearings is characterized in that magnetic poles face each other so that the oil stopper and the bearing portion of the rotor face each other by the magnetic force between the oil stopper and the bearing portion of the rotor. Motor with stopper. The method of claim 10, The oil stopper is a motor using a bearing oil stopper, characterized in that the fluorine-based oil barrier treatment.

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