JP2909798B2 - motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor for holding and processing a frame by a chuck of a processing machine.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3 (A), a frame 1 and a hub 2 rotatably supported by the frame 1 are shown.
Is known.

The frame 1 has an annular flange portion 1a,
An annular fitting portion 1b set to have a smaller diameter than the flange portion 1a and fitted to the chassis 4 and a chuck 5 having a smaller diameter than the annular fitting portion 1b, as shown in FIG. And an annular holding portion 1c that is held by the The chuck 5 is used when the frame 1 is cut by a turning machine or the like.

[0004]

By the way, in the motor 3 constructed as described above, when the motor 3 is mounted on the chassis 4, that is, the annular fitting portion 1b is fitted in the fitting hole 4a of the chassis 4. At the time of fitting, the clearance between the fitting hole 4a and the annular fitting portion 1b is so small that the chassis 4 is caught on the annular holding portion 1c, making it difficult to perform a smooth installation. It was unreliable that it would occur. Further, if the thickness S of the annular fitting portion 1d is set to be small, it is difficult to set a step with the annular holding portion 1c. Further, since the annular holding portion 1c protrudes from the annular fitting portion 1b, it is difficult to reduce the thickness of the motor 3.

An object of the present invention is to provide a motor capable of improving reliability and the like and realizing a thinner motor in view of the above situation.

[0006]

In order to achieve the object, an invention according to claim 1 is a bearing for rotatably holding a rotor fitting unit and a core fitting portion to which an armature core is fitted. In a motor having a frame integrally formed with a shaft portion to which an inner ring is fitted, a circular concave portion formed by a chuck of a processing machine is formed on a bottom surface of the frame. Is what you do.

According to a second aspect of the present invention, there is provided a shaft into which a central shaft for rotatably holding a rotor fitting unit and a rotor unit via a bearing is fitted. In a motor having a frame in which a fitting hole is integrally formed, a circular concave portion formed by a chuck of a processing machine is formed on a bottom surface of the frame.

[0008]

In such a construction, since a circular recess is formed on the bottom surface of the frame and held by the chuck of the processing machine, the step does not hinder when the motor is assembled into the chassis. Assembly can be performed smoothly, and generation of dust and the like can be prevented, so that reliability is improved. Further, even if the chassis is thin, the fitting portion of the frame is sufficiently ensured, and the holding portion by the chuck does not protrude, so that the motor can be made thin.

[0009]

Next, an embodiment of a motor according to the present invention will be described with reference to FIGS.

(First Embodiment) FIGS. 1A and 1B show a first embodiment of a motor according to the present invention. FIG. 1A is a longitudinal sectional view of the motor, and FIG. It is sectional drawing of the frame of the state hold | maintained by the chuck | zipper.

In FIG. 1A, a motor 10 includes a frame 11, an armature core 13 around which a coil 12 is wound,
A hub 15 rotatably supported by the frame 11 via bearings 14, 14, and a yoke 16 fixed to the hub 15
And a drive magnet 17 fixed to the yoke 16 so as to face the armature core 13. Note that the hub 15, the yoke 16, and the drive magnet 17 constitute a rotor unit.

The frame 11 has a disk-shaped flange portion 11.
a, a chassis fitting portion 11b formed at the peripheral end of the flange portion 11a for fitting into the fitting hole 18a of the chassis 18, and an armature protruding from the upper surface of the flange portion 11a and attached to the outer peripheral surface thereof. An annular core fitting portion 11c to which the inner peripheral surface of the core 13 is fitted, and a shaft portion 11d protruding from the core fitting portion 11c and fitting the bearings 14, 14 to the outer peripheral surface thereof.
And a circular recess 11e formed on the bottom surface of the flange 11a. In addition, these flange parts 1
1a, the chassis fitting portion 11b, the core fitting portion 11c, the shaft portion 11d, and the concave portion 11e are all formed coaxially.

The recess 11e is formed on the outer peripheral surface of the core fitting portion 11b when the frame 11 is finished.
When fitting the bearings 14 and 14 on the outer peripheral surface of the shaft portion 11d.
As shown in FIG. 1B, when the inner peripheral surface of the motor is fitted, and when the assembled motor 10 is fitted into the fitting hole 18a of the chassis 18, a chuck such as a turning machine is used. The frame 11 is held by expanding the frame 19. Further, the concave portion 11e differs depending on the size of the motor 10 and the like.
In the case of a spindle motor for DD, the diameter D is 7 to 1
The depth L is set to about 1 to 2 mm.

When the frame 11 is finished, the concave portion 11e is held by the chuck 19 so that the outer peripheral surface of the chassis fitting portion 11b, the outer peripheral surface of the core fitting portion 11b, the outer peripheral surface of the shaft portion 11d, etc. It is possible to perform processing without re-chucking all the important parts that require strict runout accuracy and dimensional accuracy, and to provide a highly accurate frame 11.

In such a configuration, the frame 11
First, a flange portion 11a, a chassis fitting portion 11b,
After machining the core fitting portion 11c, the shaft portion 11d, and the concave portion 11e by cutting or the like, the chuck 19 is inserted into the concave portion 11e to hold the frame 11, and the flange portion 11a,
Chassis fitting portion 11b, core fitting portion 11c, shaft portion 11d
Finish processing is performed. At this time, once the chuck 19
Is fitted into the recessed portion 11e, all the finishing processes are performed without releasing the fitted state. Further, when the motor 10 is assembled, the armature core 13 is fitted to the core fitting portion 11b, and the bearings 14 and 14 are fitted to the shaft portion 11d.
The concave portion 11c may be used for fitting or the like.

The motor 10 with the armature core 13 with the coil 12 wound thereon, the drive magnet 17 and the hub 15 with the yoke 16 fixed thereto is assembled into the chassis fitting portion 18 a in the fitting hole 18 a of the chassis 18. 11c is fitted, and the hub 15 is moved by the current flowing through the coil 12 and the magnetic force of the drive magnet 17 so that the yoke 1
6 and the driving magnet 17.

When the motor 10 is installed, the motor 10
Inserts the chuck 19 into the recess 11e and
The installation work is performed while holding the chuck 1
9 is a concave portion formed at a position separated from the chassis fitting portion 11c, so that the holding portion does not interfere with the fitting hole 18a of the chassis 18 or the like, and the assembly is easy. In addition, it is possible to provide a highly reliable motor 10 that can perform an installation operation without generating scratches and dust.

Further, a fitting portion to the chassis 18, that is,
Even if the thickness of the flange portion 11a is small, the concave fitting portion 11c can be formed, so that not only the motor 10 can be made highly versatile, but also the projecting portion corresponding to the conventional annular holding portion 1c can be formed by the flange 11a. It is not necessary to form the motor 10 on the bottom surface, so that the thickness of the motor 10 can be reduced.

(Second Embodiment) FIGS. 2A and 2B show a second embodiment of the motor of the present invention. The first
In the motor 10 of the embodiment, the holding shaft for rotatably holding the hub 15 via the bearings 14, 14 is provided on the shaft portion 1 of the frame 11.
In contrast to 1d, which is integrally formed, in the second embodiment, the holding shaft is formed separately from the frame. In FIG. 2, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 2A, a center shaft 22 is held by a frame 21 of a motor 20. Frame 21
Are a disk-shaped flange portion 21a, a chassis fitting portion 21b formed at the peripheral end of the flange portion 21a for fitting to the chassis 18, and an electric motor protruding from the upper surface of the flange portion 21a and having an outer peripheral surface. An annular core fitting portion 21c into which the inner peripheral surface of the child core 13 is fitted, a shaft fitting hole 21d passing through the core fitting portion 21c, and a circular concave portion 21e formed on the bottom surface of the flange portion 21a. And are integrally provided. The flange portion 21a, the chassis fitting portion 21b, the core fitting portion 21c, the shaft fitting hole 21d, and the concave portion 21e are all formed coaxially.

The center shaft 22 is held by the frame 21 by fitting the lower end outer peripheral surface into the shaft fitting hole 21d. The bearings 14 are fitted on the outer peripheral surface of the upper end of the center shaft 22.

When finishing the frame 21, the concave fitting portion 21e is provided on the outer peripheral surface of the core fitting portion 21b.
When the center shaft 22 is fitted to the inner peripheral surface of the shaft fitting hole 21d.
2 and when the assembled motor 20 is fitted to the chassis 18 and the like.
As shown in (B), the frame 21 is held by expanding the chuck 19 of a turning machine or the like.

When the frame 21 is finished, the concave portion 21e is held by the chuck 19, so that the outer peripheral surface of the chassis fitting portion 21b, the outer peripheral surface of the core fitting portion 21b, and the inside of the shaft fitting hole 21d. It is possible to machine all the important parts, such as the peripheral surface, for which run-out accuracy and dimensional accuracy are strictly required without re-chucking, and to provide a highly accurate frame 21.

In such a configuration, the frame 21
First, the flange portion 21a, the chassis fitting portion 21b,
After machining the core fitting portion 21c, the shaft fitting hole 21d, and the concave portion 21e by cutting or the like, the chuck 19 is inserted into the concave portion 21e and the flange portion 21 is held while holding the frame 21.
a, finishing processing of the chassis fitting portion 21b, the core fitting portion 21c, and the shaft fitting hole 21d is performed. At this time, once the chuck 19 is fitted into the concave portion 21e, all the finishing processes are performed without releasing the fitted state. Further, the core fitting portion 2 when assembling the motor 20 is used.
The recess 21c may be used for fitting the armature core 13 to the shaft 1b, fitting the center shaft 22 to the shaft fitting hole 21d, fitting the bearings 14, 14 to the center shaft 22, and the like.

The motor 20 with the armature core 13 wound with the coil 12, the drive magnet 17 and the hub 15 with the yoke 16 fixed thereto is assembled into the chassis fitting portion 18 a in the fitting hole 18 a of the chassis 18. The hub 15 is mounted by fitting the coil 21 c and the magnetic force of the driving magnet 17 flows through the coil 12 so that the hub 15 is
6 and the driving magnet 17.

[0026]

As described above, in the motor according to the present invention, since the circular concave portion formed by the chuck of the processing machine is formed on the bottom surface of the frame, the motor is mounted on the chassis. The assembly can be performed smoothly without interfering with a step when the device is incorporated into the device, and the generation of dust and the like can be prevented, thereby improving the reliability. Further, even if the chassis is thin, the fitting portion of the frame is sufficiently ensured, and the holding portion by the chuck does not protrude, so that the motor can be made thin.

[Brief description of the drawings]

1A and 1B show a motor according to the present invention, wherein FIG. 1A is a longitudinal sectional view of the motor, and FIG. 1B is a sectional view of a frame held by a chuck.

FIGS. 2A and 2B show a motor according to a second embodiment of the present invention, in which FIG. 2A is a longitudinal sectional view of the motor, and FIG. 2B is a sectional view of a frame held by a chuck.

3A and 3B show a conventional motor, in which FIG. 3A is a front view of the motor, and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Motor 11 ... Frame 11c ... Core fitting part 11d ... Shaft part 11e ... Depressed part 14 ... Bearing 15 ... Hub 19 ... Chuck

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H02K 29/00 H02K 5/16 H02K 5/173 H02K 15/14 H02K 21/00

Claims (2)

(57) [Claims] A motor having a frame in which a core fitting portion into which an armature core is fitted and a shaft portion into which an inner ring of a bearing for rotatably holding a rotor unit is fitted are integrally formed. 3. The motor according to claim 1, wherein a circular recess held by a chuck of a processing machine is formed on a bottom surface of the frame. 2. A core fitting portion in which an armature core is fitted and a shaft fitting hole in which a central shaft for rotatably holding a rotor unit via a bearing is fitted. A motor having a frame formed as described above, wherein a circular recess held by a chuck of a processing machine is formed on a bottom surface of the frame.