JPH1141845A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance cleanliness by properly preventing pollution from an adhesive, with simple and low-cost structure. SOLUTION: A rotor magnet 24 is locked in the direction of a rotary shaft through mechanical fixing means 25, 26, and 27 provided at a hub body 21 (circular flange part 21b for mounting, etc.,) in such a way as to be pressure- contacted with the one end face in the rotating direction of the rotor magnet 24, so that the rotor magnet 24 is fixed to the side of the hub body without the use of an adhesive. This obviates the need for the use of the adhesive at the time of fixing of the rotor magnet 24, and the pollution by the outgas from the adhesive as in the conventional system can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor in which a rotor magnet is fixed to a hub for holding a member to be rotated.

[0002]

2. Description of the Related Art In general, in various motors such as HDD motors, a rotatable hub body is provided with a motor.
A rotor magnet is fixed directly or via a yoke, and a rotating body such as a disk held on the outer peripheral side of the hub body is driven to rotate by a drive system including the rotor magnet. I have.

[0003] In such a motor, an adhesive is usually used to fix the rotor magnet to the hub body side. This adhesive is applied, for example, to the outer peripheral surface of a ring-shaped rotor magnet, and the outer peripheral surface of the rotor magnet is fixed to the inner peripheral surface of the hub body via the adhesive.

[0004]

However, HDD motors, CD-ROM motors, DVD motors, LBP motors, etc.
In precision motors that require a high-purity environment, such as motors for motors, there is a problem in that rotating members such as disks are contaminated by outgas released from the adhesive for fixing the rotor magnet as described above. is there. That is, the rotor magnet is often arranged on the outer peripheral side near a rotated member such as a disk that requires high cleanliness, and has a relatively large volume, so that the amount of adhesive used is large. In some cases, the influence of the outgas released from the adhesive directly affects the rotating member.

Accordingly, an object of the present invention is to provide a motor which has a simple and low-cost structure, prevents contamination by an adhesive, and can improve cleanliness.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a hub provided to hold and rotate a member to be rotated, and a hub fixed to the hub. An annular rotor magnet, and a stator arranged to circumferentially oppose the annular rotor magnet, wherein the motor for rotating the hub body includes: Mechanical fixing means for pressing the rotor magnet in the rotation axis direction by pressing against one end face in the rotation axis direction is provided, and the rotor magnet is fixed to the hub body side without using an adhesive via the mechanical fixing means. Have been.

According to the first aspect of the present invention,
Since an adhesive is not used for fixing the rotor magnet, contamination due to outgas from the adhesive as in the related art is avoided.

According to the second aspect of the present invention, a yoke is interposed between the hub body and the rotor magnet of the first aspect, and both the yoke and the rotor magnet are provided on the hub body. It is fixed to the hub body side via a mechanical fixing means without using an adhesive.

Further, according to the third aspect of the invention, a yoke is interposed between the hub body and the rotor magnet according to the first aspect, and the yoke is provided via mechanical fixing means provided on the hub body. And the rotor magnet is fixed to the yoke without using an adhesive via mechanical fixing means provided on the yoke, and the hub is fixed via the yoke. A rotor magnet is fixed to the body side.

According to the above-described means, since no adhesive is used for fixing the yoke, no contamination is caused by the fixing of the yoke.

Further, in the invention according to claim 4, the mechanical fixing means according to claim 1 is one of a caulking fixing means, a screw fixing means, a pin fixing means, and a leaf spring fixing means provided on the hub body. Consisting of at least one of

As described above, if the fixing means which is easy to use, such as the caulking fixing means, the screw fixing means, the pin fixing means, the leaf spring fixing means, etc. is adopted as the mechanical fixing means, The motor can be easily assembled.

According to the fifth aspect of the present invention, the rotor magnet according to the first aspect is fixed to the hub body via an elastic member.

According to the fifth aspect of the present invention, if an elastic member is interposed between the rotor and the hub body when the rotor magnet is fixed, the stress applied to the rotor magnet is dispersed by the buffering action of the elastic member. As a result, it is possible to prevent deterioration and breakage of the characteristics of the rotor magnet.

Further, in the invention according to claim 6, the rotor magnet and the hub body according to claim 1 are provided with an anti-slip portion which abuts in the rotational direction to lock the two members in the rotational direction. I have.

If the anti-slip portion is provided as described above, the rotor magnet and the hub body are more securely fixed in the rotation direction, and a more stable motor driving operation can be obtained.

Further, in the invention according to claim 7, the rotor magnet, the yoke and the hub body according to claim 2 or 3 are prevented from slipping by abutting in the rotational direction to lock these two members in the rotational direction. Part is provided.

If the anti-slip portion is provided, the yoke and the hub body are more securely fixed in the rotational direction, and a more stable motor driving operation can be obtained.

Further, in the invention according to claim 8, the hub body according to claim 1 is arranged in a sealed case.

That is, the present invention is suitably applied to a motor housed in a closed case so as to ensure cleanliness.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a so-called fixed-end-shaft HDD spindle motor will be described in detail with reference to the drawings. First, the overall structure of the HDD spindle motor shown in FIG. 1 will be described. This HDD spindle motor is disposed in a closed case (not shown) in order to ensure cleanliness. The structure of the motor accommodated in the motor will be described below.

First, the illustrated HDD spindle motor includes a stator set 1 as a fixed member and a rotor set 2 as a rotating member assembled to the stator set 1 from above in the figure. The stator set 1 has a frame 11 screwed to a fixed base (not shown), and a fixed shaft 13 in a support holder 12 provided at a substantially central portion of the frame 11.
Are erected so as to extend upward in the figure.
The distal end (upper end in the figure) of the fixed shaft 13 is screwed to a fixed base (not shown).

A stator core 14 is fitted around the support holder 12 on the frame 11, and a winding 15 is wound around the salient pole of the stator core 14.

On the other hand, the rotor set 2 has a hub 21 for supporting a recording medium (not shown). The hub 21 is a pair of hubs 21 fixed to the center of the hub 21. It is rotatably supported on the outer peripheral side of the fixed shaft 13 via ball bearings 22, 22. That is, the hub body 21 has a substantially cylindrical body portion 21a for mounting a magnetic recording medium such as a magnetic disk on the outer peripheral portion, and a mounting portion provided at a shaft end opening portion of the body portion 21a. A rotor magnet 24 is annularly mounted on the inner peripheral side of the annular flange portion 21 b via a back yoke 23.
The annular rotor magnet 24 is arranged close to the outer peripheral end surface of the stator core 14 so as to circumferentially face the outer peripheral end surface.

The back yoke 23 is made of an annular magnetic member having a substantially L-shaped cross section. The back yoke 23 is mounted so as to be in close contact with the inner peripheral surface of the mounting annular flange portion 21b of the hub body 21, and the hub The back yoke 23 is fixed by caulking fixing means 25 and 26 formed on the mounting annular flange portion 21b of the body 21.

That is, in this embodiment, in particular, FIG.
As shown in FIG.
The caulking fixing means 25 and 26 are employed as mechanical fixing means for fixing to the side. Of these, the caulking fixing means 25 is provided with the mounting annular flange portion 21 of the hub body 21.
b is formed on the inner peripheral side of the lower end opening in the drawing, and the claw portion 25a of the caulking fixing means 25 is pressed against one axial end surface (the lower surface in the drawing) of the back yoke 23 so that the back The yoke 23 is configured to be fixed to the hub body 21 side without using an adhesive.

The caulking fixing means 26 is provided at a portion corresponding to the inner peripheral portion of the L-shaped cross section of the back yoke 23, and is provided at the claw portion of the caulking fixing means 26 formed on the hub body 21 side. Since the inner peripheral portion of the back yoke 23 is fixed by 26a, the back yoke 23
The fixing force has been reinforced.

On the other hand, the rotor magnet 24 is mounted such that the outer peripheral surface of the rotor magnet 24 is in close contact with the inner peripheral surface of the back yoke 23, and is formed at one axial end of the back yoke 23. The caulking fixing means 27 fixes the rotor magnet 24.

That is, in the present embodiment, a caulking fixing means 27 provided on the back yoke 23 is employed as a direct mechanical fixing means for the rotor magnet 24, and the claw 27a of the caulking fixing means 27 is used. Is pressed against one end surface (lower surface in the figure) of the rotor magnet 24 in the axial direction, so that the rotor magnet 24 is fixed without using an adhesive.

As the above-mentioned rotor magnet 24,
Rare earth-based bond magnets, sintered magnets, or the like are used. When the back yoke 23 is fixed by the mechanical fixing means as described above, the rotor magnet 24 is fixed by suction to the back yoke 23 and the hub body 21. In order to increase the force as much as possible, it is preferable to set the maximum energy product to 8 MOe or more.

Returning to FIG. 1, the inner rings 22a of the above-mentioned pair of ball bearings 22, 22 are fixed to the outer peripheral surface of the fixed shaft 12, and the respective ball bearings 22, 22 are fixed.
The outer races 22b, 22b are fixed to the inner peripheral wall surface of a fixing hole 21c provided at the center of the hub body 21. These two ball bearings 22, 22 are provided at predetermined intervals in the axial direction, and the hub body 21 is rotatably supported on the fixed shaft 12 by the two ball bearings 22, 22.

A disc-shaped holding plate 30 is press-fitted and fixed in the upper opening of the fixing hole 21c provided in the hub body 21 as shown in the figure. Upper side) is in contact with the end face. The inner peripheral side wall surface of the presser plate 30 is disposed so as to be close to the outer peripheral surface of the fixed shaft 12, and the presser plate 30 is configured to prevent oil and the like in the motor from scattering to the outside. ing.

According to such an apparatus according to the present embodiment, the rotor magnet 24 is connected to the back yoke 2
And crimping means 25, 26, 27
In order to fix the rotor magnet 24, no adhesive as in the related art is used. Therefore, according to the present embodiment, contamination due to outgassing from the adhesive as in the related art is avoided.

In this embodiment, the back yoke 23
The back yoke 23 is also fixed to the hub body 21 by caulking means 25 and 26, and no adhesive is used for fixing the back yoke 23. Outgassing contamination is avoided.

At this time, as in this embodiment, if a fixing means which is easy to use such as the caulking fixing means 25, 26, 27 is employed as the mechanical fixing means, the motor can be easily assembled.

On the other hand, in the embodiment shown in FIG. 3 in which the same components are represented by the same reference numerals, they are formed at one axial end (lower end in the drawing) of the mounting annular flange portion 21b of the hub body 21. The back yoke 23 and the rotor magnet 24 are both fixed by one caulking fixing means 45.

That is, the claw portion 45a of the caulking fixing means 45 in the present embodiment is positioned from one axial end (the lower end in the drawing) of the mounting annular flange portion 21b of the hub 21 to the center (the left side in FIG. 3). When the claw portion 45a of the caulking fixing means 45 is pressed against both end surfaces of both the back yoke 23 and the rotor magnet 24, both the back yoke 23 and the rotor magnet 24 are simultaneously fixed. I have.

In the embodiment shown in FIG.
Screw means 55 is used as mechanical fixing means for fixing the back yoke 23 and the rotor magnet 24.

That is, the screw fixing means 55 in the present embodiment is such that the fixing screw 55b is screwed through the washer 55a to the axial end surface (the lower surface in the figure) of the mounting annular flange portion 21b of the hub body 21. The screw fixing means 55 is provided at a plurality of positions in the circumferential direction.
The washer 55a extends toward the center of the shaft so as to be in contact with both end faces of the back yoke 23 and the rotor magnet 24. 24 are simultaneously fixed.

The washer 55a is connected to the screw fixing means 5
Although each of them is provided for every five, it is also possible to use a ring-shaped plate-like member that extends annularly and continuously along the axial end surface of the mounting annular flange portion 21b of the hub body 21.

In the embodiment shown in FIG.
A pin fixing means 65 is used instead of the screw means 55 in the embodiment according to FIG. That is,
The pin fixing means 65 in the present embodiment is an axial end face of the mounting annular flange portion 21b of the hub body 21 (the lower surface in the figure).
The mounting holes 65a provided in the
b, with a cracked pin 65c attached through
An engagement portion 65d provided at a tip portion (upper end portion in the drawing) of the cracked pin 65c is fitted into a locking step provided at an intermediate portion of the mounting hole 65a, so that a ring-shaped fixing is performed. The plate 65b is fixed.

The above-mentioned ring-shaped fixing plate 65b is
1 is a plate-like member that extends annularly and continuously along the axial end surface of the mounting annular flange portion 21b, and presses against both end surfaces of the back yoke 23 and the rotor magnet 24 so that the shaft center side (the left side in the drawing) ), Both the back yoke 23 and the rotor magnet 24 are fixed at the same time.

Further, in the embodiment shown in FIG. 6, an annular leaf spring fixing means 75 is used as a mechanical fixing means for fixing the back yoke 23 and the rotor magnet 24.

That is, as the leaf spring fixing means 75, for example, a C-shaped ring member 75a having elasticity as shown in FIG. 7, or FIGS. 8 (a) and 8 (b) are shown. A plurality of fixing projections 75c are provided on the outer peripheral portion of the continuous annular main body piece 75b in the circumferential direction. The outer peripheral portion of the leaf spring fixing means 75 is fixed in a mounting groove 75 d formed in the inner peripheral wall surface of the mounting annular flange portion 21 b of the hub body 21. By extending toward the center of the shaft (left side in the figure) so as to be pressed against the end surfaces of both the yoke 23 and the rotor magnet 24 by its elasticity, both the back yoke 23 and the rotor magnet 24 are fixed. Is being done at the same time.

Further, the embodiment shown in FIG.
Basically, it has substantially the same configuration as the embodiment shown in FIG. 1 and FIG. 2 described above, except that the rotor magnet 24 has an elastic member 80 such as rubber interposed therebetween. Is fixed to the back yoke 23.

As described above, if the elastic member 80 is interposed between the rotor body 24 and the hub body 21 when the rotor magnet 24 is fixed, the stress applied to the rotor magnet 24 is dispersed by the buffering action of the elastic member 80. As a result, it is possible to prevent the characteristics of the rotor magnet 24 from being degraded or damaged.

Furthermore, the embodiment shown in FIG. 10 basically has substantially the same configuration as the embodiment shown in FIGS. 1 and 2 described above.
The difference is that the rotor magnet 24, the back yoke 23
And the hub body 21 is provided with anti-slip portions 90 and 91 for locking these members in the rotation direction.

First, the anti-slip portion 90 is provided at a connection portion between the hub body 21 and the back yoke 23, and a plurality of anti-slip portions 90 are provided along the circumferential direction on the upper surface portion of the back yoke 23. The back yoke 2 comprises a concave portion and a plurality of convex portions protrudingly provided on the hub body 21 side so as to be fitted into the concave portion on the back yoke 23 side.
The protrusion on the hub body 21 side is inserted in the recess on the side 3 in the axial direction.

The concave portion on the back yoke 23 side and the convex portion on the hub body 21 side have end faces that come into contact with each other in the rotational direction, and the end faces of these two members come into contact with each other in the circumferential direction. The relative displacement between the two members is prevented.

Next, the anti-slip portion 91 is provided at a connection portion between the rotor magnet 24 and the back yoke 23, and is formed by notching the upper edge portion of the rotor magnet 24 along the circumferential direction. A plurality of portions are formed, and a convex portion is provided at a position corresponding to the notch on the back yoke 23 side.
The projection on the back yoke 23 side is fitted in the cutout on the side 4 in the axial direction.

The notch portion on the rotor magnet 24 side and the convex portion on the back yoke 23 side have end faces that come into contact with each other in the rotational direction, and these end faces come into contact with each other in the circumferential direction. Thereby, the relative displacement between the two members is prevented.

As in the present embodiment, the slip prevention portions 90 and 91 are provided.
Is provided, the back yoke 23 and the rotor magnet 24 are more reliably fixed to the hub body 24 in the rotation direction, and a more stable motor driving operation can be obtained.

Although the embodiments of the present invention made by the inventor have been specifically described above, the present invention is not limited to the above-described embodiments, and can be variously modified without departing from the gist thereof. Needless to say.

The present invention is preferably applied to a motor housed in a sealed case so as to ensure cleanliness. For example, the present invention is a so-called motor as in the above-described embodiment. Without being limited to fixed shaft type motors,
The present invention can be similarly applied to a shaft rotation type motor. Further, the bearing is not limited to the ball bearing as in the above-described embodiment.

Furthermore, the present invention provides a motor other than the HDD motor according to the above-described embodiment, for example, a CD-R.
The same can be applied to an OM motor, a DVD motor, an LBP motor, and the like.

The mechanical fixing means according to the present invention comprises:
The present invention is not limited to the above-described caulking fixing means, screw fixing means, pin fixing means, and leaf spring fixing means, and various kinds of mechanical fixing means can be similarly employed.

[0057]

As described above, according to the first aspect of the present invention, the rotor magnet is fixed in the rotation axis direction by the mechanical fixing means provided on the hub body so as to be in pressure contact with one end face in the rotation axis direction of the rotor magnet. The rotor magnet is fixed to the hub body side without using an adhesive, and the use of an adhesive is not required when the rotor magnet is fixed, so that the contamination by the outgas from the adhesive as in the past can be avoided. Therefore, with a simple and low-cost structure, contamination by the adhesive can be prevented well, the cleanliness can be improved, and the reliability of the motor can be improved.

Further, in the inventions according to the second and third aspects, the yoke and the rotor magnet are fixed to the hub body side without using an adhesive, and no adhesive is used for fixing the yoke. In addition, the above-described effects can be further enhanced without causing contamination due to the sticking of the yoke.

At this time, as described in claim 4, as the mechanical fixing means, an easy-to-use fixing means such as a caulking fixing means, a screw fixing means, a pin fixing means, a leaf spring fixing means or the like is used. As a result, the motor can be easily assembled, and the above-described effects can be further enhanced.

Further, an elastic member is interposed between the rotor body and the hub body when the rotor magnet is fixed, and the stress applied to the rotor magnet is dispersed by the buffering action of the elastic member. If this is the case, the durability of the motor can be improved, and the above-described effects can be further enhanced.

Further, if the anti-slip portion is provided to fix the rotor magnet and the hub more securely in the rotational direction, a more stable motor driving operation can be obtained. Thus, the above-described effects can be further enhanced.

Further, by providing the anti-slip portion according to the seventh aspect, if the yoke and the hub body are more securely fixed in the rotational direction, a more stable motor driving operation can be obtained. The effect obtained can be further enhanced.

Further, if the present invention is applied to a motor housed in a sealed case so as to ensure cleanliness, the effect of the present invention can be greatly improved. it can.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view showing an HDD spindle motor according to an embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view showing a main part of the motor shown in FIG. 1;

FIG. 3 is a partially enlarged cross-sectional view illustrating a main part of a motor according to another embodiment of the present invention.

FIG. 4 is a partially enlarged sectional view showing a main part of a motor according to still another embodiment of the present invention.

FIG. 5 is a partially enlarged sectional view showing a main part of a motor according to still another embodiment of the present invention.

FIG. 6 is a partially enlarged cross-sectional view illustrating a main part of a motor according to still another embodiment of the present invention.

FIG. 7 is an explanatory plan view illustrating an example of a ring-shaped member used in the motor illustrated in FIG. 6;

8A and 8B show another example of the ring-shaped member used in the motor shown in FIG. 6, wherein FIG. 8A is a plan view and FIG. 8B is a side view.

FIG. 9 is a partially enlarged sectional view showing a main part of a motor according to still another embodiment of the present invention.

FIG. 10 is a partially enlarged cross-sectional view illustrating a main part of a motor according to still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 13 Fixed shaft 21 Hub body 22 Ball bearing 23 Back yoke 24 Rotor magnet 25, 26, 27, 45 Caulking fixing means 55 Screw means 65 Pin means 75 Leaf spring fixing means 80 Elastic member 90, 91 Non-slip part

Claims (8)

[Claims] 1. A hub body provided to rotate while holding a member to be rotated, an annular rotor magnet fixed to the hub body side, and circumferentially opposed to the annular rotor magnet. A motor arranged to rotate the hub body, the rotor body being pressed against one end face of the rotor magnet in the rotation axis direction to lock the rotor magnet in the rotation axis direction. A motor provided with mechanical fixing means, wherein the rotor magnet is fixed to the hub body side via the mechanical fixing means without using an adhesive. 2. A yoke is interposed between the hub body and the rotor magnet according to claim 1, and both the yoke and the rotor magnet are bonded through a mechanical fixing means provided on the hub body. The motor is fixed to the hub body side without using a motor. 3. The hub body according to claim 1, wherein a yoke is interposed between the hub body and the rotor magnet, and the yoke is connected to the hub body without using an adhesive via mechanical fixing means provided on the hub body. The rotor magnet is fixed to the yoke via a mechanical fixing means provided on the yoke without using an adhesive, and the rotor magnet is fixed to the hub body side via the yoke. A motor characterized in that: 4. The mechanical fixing means according to claim 1, comprising at least one of a caulking fixing means, a screw fixing means, a pin fixing means, and a leaf spring fixing means provided on the hub body. Motor to do. 5. A motor, wherein the rotor magnet according to claim 1 is fixed to the hub body via an elastic member. 6. A motor, wherein the rotor magnet and the hub body according to claim 1 are provided with an anti-slip portion that abuts in the rotation direction and locks the two members in the rotation direction. 7. A rotor magnet, a yoke, and a hub body according to claim 2, further comprising an anti-slip portion that abuts in the rotational direction to lock the two members in the rotational direction. Motor to do. 8. A motor, wherein the hub body according to claim 1 is arranged in a sealed case.