JPS6277032A - Incorporated type motor - Google Patents

Abstract

PURPOSE:To enable a motor to be of a thinner type and improve the assembling property, by combining bearings and a motor shaft with a cylindrical bearing sleeve having a flange section with the diameter larger than that of the motor- fitting hole of a set chassis, to form a bearing unit, and by combining the bearing unit with a stator and a rotor after the bearing unit is fitted to the chassis. CONSTITUTION:A bearing unit 1 is provided with a cylindrical bearing sleeve 3 with a flange 15 fitted to the outer peripheral surface, and bearings 2a, 2b are fitted in the sleeve 3, and a magnetic fluid seal 16 is fitted to one end side of the sleeve 3. After that, a spindle 7 with a fitted rotor hub 6 for the center core of a hard disc is conducted to the bearings 2a, 2b, and at the other end, a boss 17 for fitting the rotor unit of a motor is fitted. In a clean room, the bearing unit 1 is screwed into a boss section 19 around the motor-fitting hole 18 of a set chassis 5. After that, a hard disc 20 is fitted to the rotor hub 6, and the internal section is closed with a cover 21. As a result, the motor can be of a thinner type and the assembling property is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a motor integrated with a rotor, and is particularly suitable for use in a motor incorporated into a hard disk memory device or the like.

[Summary of the invention]

The bearing and motor shaft are assembled into a cylindrical bearing sleeve with a flange having a diameter larger than the motor mounting hole of the cent chassis to form a bearing unit. After this bearing unit is installed on the chassis, the stator and rotor are assembled respectively. By appropriately setting the axial height position of the flange of the bearing sleeve, the bearing sleeve can be made thinner.

[Conventional technology]

FIG. 2 is a vertical sectional view of a conventional bracket type flat brushless motor, which is incorporated into a hard disk drive device. In this motor, a bracket 4 with bearings 2a and 2b fitted into a bearing sleeve 3 is first attached to a set chassis 5.
and insert it into the spindle 7 bearings 2a and 2b fitted with the flange 6 which becomes the center core of the hard disk.
Next, the stator coil 9 is attached to the back surface of the flange 6 via the thread color edge + 8, and the rotor yoke 10 with the magnet 11 attached to the end of the spindle 7 is attached.

FIG. 3 shows another conventional example, in which a bearing sleeve 3 is integrally formed with a set chassis 5, and first a bearing 2a,
Insert 2b. Next, the spindle 7 fitted with the flange 6 is inserted, and the stator coil 9 and rotor yoke 10 are assembled in the same manner as shown in FIG.

[Problem that the invention seeks to solve]

The motor shown in FIG. 2 has a portion where the flange 4 and the central chassis 5 overlap, which is disadvantageous for making the device thinner. On the other hand, although the motor shown in Figure 3 has the advantage of being thinner, when it is incorporated into a hard disk drive device, it is necessary to start assembling the motor from the details inside a clean room, so there is a lot of process work inside the clean room. It requires a large working area and is economically disadvantageous. Furthermore, the second
In the motor shown in the figure, the bearing 2a to be assembled to the bracket 1-4,
Since work such as 2b is performed outside the clean room, the process time inside the clean room is shorter than that shown in Fig. 3.

In view of this problem, it is an object of the present invention to provide a motor that can be made thinner, requires less processing time in a clean room, and is easy to assemble.

Means for Solving Problem C] In the uniform motor according to the present invention, the motor is assembled into the motor mounting hole 18 formed in the chassis 5 of the device.

As shown in FIG. 1E, the bearing sleeve 3 is provided with a cylindrical bearing sleeve 3 having a flange portion 15 having a diameter larger than that of the mounting hole.

The bearings 2a and 2b are fitted into the bearing sleeve 3, and the motor shaft spindle 7 is inserted therethrough to form a bearing unit as shown in FIG. 1A, and this bearing unit 1 is inserted into the motor mounting hole 18 as shown in FIG. 1B. After installation, the stator section is attached to the chassis 5, and the rotor section is attached to the motor shaft, as shown in FIG. 1E.

[For production]

By appropriately setting the axial height position of the flange 15 of the bearing unit 1, the distribution between the portion above and the portion below the chassis 5 can be made appropriate, and a thinner structure can be achieved.

〔Example〕

FIGS. 1A to 1E are cross-sectional views showing the structure and a series of assembly steps of an integrated moke according to an embodiment of the present invention. The motor of this embodiment is incorporated into a hard disk memory drive device. Since hard disk drives are extremely sensitive to dust, their main parts are assembled in a clean room.

As shown in FIGS. 1A to 1E, the motor according to the embodiment of the present invention is assembled into a set chassis after the bearing unit 1 is integrally assembled, thereby shortening the work process in a clean room. .

The bearing unit 1 has a flange 1 as shown in FIG. 1A.
The bearing sleeve 3 has a cylindrical shape and has a cylindrical bearing sleeve 3 attached to the outer peripheral surface. A bearing 2as2b is fitted into the sleeve 3, and a magnetic fluid seal 16 is attached to one end of the sleeve 3. Next, the spindle 7 fitted with the flange 6, which will become the center core of the hard disk, is passed through the bearings 2a and 2b.
A mounting boss 17 for mounting a motor rotor unit is fitted into the other end.

The axial height h of the flange 6 is a standard value determined by the type of drive device classified by the diameter of the hard disk (8 inches or 5 inches).

The flange 15 is characterized in that it is provided at a position within the range of the height h of the flange 6. Due to this feature, it is possible to prevent the height of the bearing unit 1 from the chassis surface when it is attached to the central chassis 5 to be much higher than the height h of the flange 6.

The bearing unit 1 shown in FIG. 1A is assembled outside a clean room, washed, and then transported into the clean room. After this, the work will be done in a clean room.

In the clean room, as shown in FIG. 1B, first the bearing unit 1 is installed in the motor mounting hole 18 of the set chassis 5.
It is screwed onto a boss portion 19 formed around the . A screwdriver insertion hole 6a is formed in the flange 6, and this hole 6a is used to insert the flange 15 of the bearing sleeve 3.
can be attached to the boss portion 19.

Next, as shown in Figure 1C, the hard disk 20 is attached to the flange 6.
Attach the cover 21 as shown in Fig. 1D to seal the inside. Note that since the bearing unit 1 is sealed with a magnetic fluid seal 16, dust will not enter through the bearing portion.

The work in the clean room is now complete, and the motor portion is assembled outside the clean room as shown in FIG. 1E. That is, the stator coil 9 is attached to the back surface of the set chassis 5 via the insulating plate 8, and the loaf yoke 10 to which the magnet 11 is fixed, facing the coil, is screwed to the attachment boss 17 at the tip of the spindle 7.

As described above, the motor of this embodiment is suitable for being made thinner, and the number of man-hours required for working in a clean room is reduced.

〔Effect of the invention〕

Since the present invention is configured as described above, a thinner uniform motor can be obtained, and if the bearing unit 1 is assembled in advance, the main body can be assembled in a short time, for example, in a clean room. If assembly work is required, the reduction in work time reduces the clean room area, resulting in cost reductions.

[Brief explanation of drawings]

1A to 1E are longitudinal sectional views of the motor showing the structure and a series of assembly steps of a uniform motor embodying the present invention;
3 and 3 are longitudinal sectional views showing a conventional integrated motor. In addition, in the symbols used in the drawings, 1------1.--111--.-bearing units 2a, 2.
b-・・−−−1−−−Bearing 3−・−・・−・−1−
−−−−・−・・Bearing sleeve 5−−・−・−・−−
−−−・−Set chassis 7−・−−1−−−−−−−
−−−−Spindle 9−−−−−−−−−−−−・−・
−Stator coil 1O−=−−−−−−−−−−−−
---1 Roke yoke 11----------Magnet 15・------------1--Flange 18----- Motor mounting hole 20--
−−−−−−−−−−− It is a hard disk.

Claims (1)

[Scope of Claims] An integrated motor in which the motor is assembled into a motor mounting hole formed in a chassis of a device, the cylindrical bearing sleeve having a flange portion having a larger diameter than the mounting hole. A bearing is fitted into the bearing sleeve, a motor shaft is inserted through it to form a bearing unit, and after this bearing unit is installed in the motor mounting hole, the stator part is attached to the chassis,
An integrated motor in which the rotor parts are respectively attached to the motor shafts mentioned above.