JP2001057755A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor which can reduce the number of part items, and the manufacturing cost. SOLUTION: A locking piece 36, installed to prevent coming-off of a rotary shaft 33 out of a sliding bearing 32, is formed integrally with a base plate 31. Compared with the case where the locking piece 36 is formed as a separate body, the number of components can be reduced, and naturally, an assembly work can be made easily, since detailed jobs such as caulking or screwing can be eliminated. A rotor guide piece 39 installed to prevent the runout in rotation is also made integral with the base plate 31. Compared with the case where the rotor guide piece 39 is formed as a separate body, the number of components can be reduced, and naturally, an assembly work can be done easily since there is no need of elaborate jobs of adhering and fastening. Accordingly, the manufacturing cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor which can be used, for example, for driving a recording disk or a blower fan.

[0002]

FIG. 9 is a sectional view showing a conventional disk drive motor 1, and FIG. 10 is a plan view of the disk drive motor 1. As shown in FIG. The motor includes a disk drive motor 1 and a blower motor, and these motors (hereinafter, the disk drive motor will be described as an example) 1 have a rotating shaft 2 to reduce manufacturing costs. A sliding bearing 3 is used as a bearing means for supporting. The motor 1 using the sliding bearing 3 has a retaining structure for retaining the rotating component 4 including the rotating shaft 2 from the structure of the sliding bearing 3, and the axis of the rotating shaft 2 is eccentric from the axis of the sliding bearing 3. And an eccentric support structure that stabilizes rotation.

A motor 1 for driving a floppy disk (hereinafter sometimes simply referred to as a "disk")
It has a base plate 7 that is fixed to the body of the device in which the motor 1 is provided. The base plate 7 is made of a magnetic material such as iron. A cylindrical bearing 3 made of an oil-impregnated porous material is held in a bearing holding member 5 erected at the center of the base plate 7. The rotating shaft 2 is rotatably supported by being inserted into the bearing 3. Slide bearing 3
Is a radial bearing that supports radial loads,
The lower end of the rotating shaft 2 is supported from below by contacting a thrust receiver 6 provided at the lower end of the bearing holding member 5.

[0004] A stator 9 having a coil 8 is provided on the bearing holding member 5 so as to be externally fitted thereto. A current is supplied from a circuit board 10 provided on the base plate 7 to the coil 8.
Is excited. A turntable 11 is provided at an upper end of the rotating shaft 2 protruding from the bearing holding member 5, and a rotor yoke 12 is mounted on the turntable 11. The rotor yoke 12 is provided with a permanent magnet 13 as a driving magnet facing the coil 8. When the coil 8 is excited, the rotating member 4 having the rotating shaft 2, the turntable 11, the rotor yoke 12 and the permanent magnet 13 is generated by the magnetic action between the stator 9 and the permanent magnet 13.
Is rotated about the axis L <b> 1 of the rotating shaft 2.

The rotor yoke 12 is provided with a drive pin member 14 which is swingable up and down and left and right. A pin body 15 of the drive pin member 14 extends upward from a through hole 16 formed at an eccentric position of the rotor yoke 12. It is protruding. The disk is placed on the turntable 11, and the pin body 15 is fitted and engaged in the engagement hole formed in the disk, and the disk is driven to rotate with the rotation of the rotating member 4.

[0006] The rotary structure 4 has only the rotary shaft 2 supported by the slide bearing 3 and the thrust bearing 6.
When an external force is applied upward against the own weight of the rotating component 4 and the magnetic attraction of the stator 9 and the permanent magnet 13 (for example, before the disk is completely mounted on a predetermined position of the turntable 11, When the turntable 11 is magnetically attracted toward the motor, or when some impact acts on the motor during the movement of the apparatus, the turntable 11 is pulled out. There is provided a retaining member 17 for preventing upward movement. The retaining member 17 is formed separately from the base plate 7 and is fixed to the base plate 7 by so-called caulking which deforms by applying an external force. The structure in which the rotor yoke 12 is locked by such a retaining member 17 realizes a retaining structure of the rotating component 4.

[0007] Further, a gap exists between the rotating shaft 2 and the slide bearing 3 so that the rotating shaft 2 rotates smoothly. Therefore, when the rotating structure 4 rotates,
There is a possibility that the axis L1 of the rotating shaft 2 is not fixed at a fixed position, and a so-called swing rotation that rotates while being displaced. In order to prevent this swing rotation, the axis L1 of the rotating shaft 2 is intentionally tilted in one direction with respect to the axis of the sliding bearing 3. Specifically, an arc-shaped rotor guide piece 18 made of a ferromagnetic material formed separately is adhered and fixed to the base plate 7. This rotor guide piece 18 is
Is provided in one area in the circumferential direction around the axis L1. When the permanent magnet 13 magnetically attracts the rotor guide piece 18,
The rotating component 4 can stably rotate in a state where the rotating component 4 is tilted in the direction in which the rotor guide piece 18 is provided with respect to the axis L1. Thus, an eccentric support structure is realized, and this eccentric support structure is disclosed in, for example, Japanese Patent Application Laid-Open No. 10-801.
19 publication.

Another prior art structure for retaining a rotating component is disclosed in Japanese Patent Application Laid-Open No. 10-210699. In this conventional technique, a rotor frame is locked from the inside by a retaining member fixed to a base to prevent the rotor frame from being removed. The retaining member is formed on the base and the valve body, and is fixed to the base using a screw member.

[0009]

The motor 1 as described above
In response to the demand for reducing the manufacturing cost of the device provided with the motor 1, the manufacturing cost is also required to be reduced. Despite these requirements, the motor 1
However, since the retaining member 17 is required to prevent the rotation component 4 from being removed, the number of parts is increased, and a complicated assembling operation requiring time and effort is required, and the manufacturing cost is increased. . The electric motor disclosed in Japanese Patent Application Laid-Open No. H10-210699 also has this problem.

In addition, the motor 1 requires the rotor guide piece 18 to eccentrically support the rotary structure 4, which also increases the number of parts and necessitates a complicated assembling operation requiring time and effort. However, there is a problem that the manufacturing cost is increased. The motor disclosed in Japanese Patent Application Laid-Open No. H10-80119 also has this problem.

An object of the present invention is to provide a motor capable of reducing the number of parts and the manufacturing cost.

[0012]

According to the first aspect of the present invention, there is provided a base plate, sliding bearing means held on the base plate, a rotating shaft rotatably supported by the sliding bearing means, and a stator provided on the base plate. And a rotor provided on the rotating shaft and rotating around the axis of the rotating shaft with respect to the base plate by a magnetic action between the stator and the rotor, and locking the rotor to stop the rotating shaft from slipping out of the bearing means. And a locking piece formed integrally with the base plate.

According to the present invention, the rotor is provided on the rotating shaft supported by the sliding bearing means held on the base plate, and the rotor and the rotating shaft are rotated by magnetic action between the rotor and the stator provided on the base plate. . In order to prevent the rotating shaft thus rotated from slipping out of the sliding bearing means, a locking piece is provided to lock the rotor. The locking piece for preventing the rotation shaft from being removed is formed integrally with the base plate, and the number of parts can be reduced as compared with the case where the locking piece is formed separately as in the prior art. As a matter of course, as in the case of being formed separately, there is no need for a detailed operation of mounting by caulking or using screws, and the assembling operation is also easy. Therefore, the manufacturing cost can be reduced.

According to a second aspect of the present invention, the locking piece is
The rotor includes a first piece connected to the base plate and a second piece connected to the first piece. The first piece is disposed radially outward of the rotor, and the second piece connects the rotor. It is arranged at a position where it can be stopped.

According to the present invention, the locking piece has a first piece disposed radially outward of the rotor, and the rotor can be locked by the second piece. Thus the first
By arranging the one piece radially outward of the rotor,
Irrespective of the shape of the rotor, it is possible to prevent the rotation shaft from slipping out of the sliding bearing means. For example, an engagement pin engaged with the disk is provided inside the rotor, and the disk drive is difficult to lock from the inside. The present invention can be suitably applied to a motor and the like.

According to a third aspect of the present invention, the rotor includes:
It has a permanent magnet, is made of a magnetic material, and is provided in a region in the circumferential direction around the axis of the rotating shaft, facing the movement path of the permanent magnet, and applies a magnetic force acting in the axial direction to the permanent magnet in the circumferential direction. Wherein the locking piece is formed by punching out the remaining area of the base plate material except for the one area in the circumferential direction of the portion facing the moving path of the permanent magnet of the material of the base plate. By punching out the locking piece, the base plate is formed in an arc shape in a circumferential area of a portion facing the moving path of the permanent magnet of the material of the base plate.

According to the present invention, in order to prevent run-out rotation,
A rotor guide piece made of a magnetic material is provided, and the magnetic force acting in the axial direction on the permanent magnet is changed in the circumferential direction,
Specifically, in one region in the circumferential direction around the axis of the rotating shaft, the permanent magnet magnetically attracts the rotor guide piece, whereby the rotor and the rotating shaft are stably tilted to the side where the rotor guide piece is provided. And rotated. The run-out rotation here needs to be supported by the sliding bearing means so that the rotating shaft can rotate smoothly. Therefore, a gap is formed between the rotating shaft and the sliding bearing means. Means the rotation while the axis of the rotating shaft is displaced. The rotor guide piece for preventing such run-out rotation is formed by punching out the remaining area except for the one area in the circumferential direction of the part facing the moving path of the permanent magnet of the base plate material, whereby the locking piece is formed. The base plate material is formed in an arc shape in a circumferential area of a portion facing the moving path of the permanent magnet. As described above, the rotor guide piece is formed integrally with the base plate, so that the number of parts can be reduced as compared with the case where the rotor guide piece is formed separately as in the prior art. Naturally, as in the case of being formed separately, a fine work of bonding and fixing is not required, and the assembling work is also easy. Therefore, the manufacturing cost can be reduced. Furthermore, by punching out the locking piece, the rotor guide piece is also formed,
Processing time can be reduced.

According to a fourth aspect of the present invention, there is provided a stator having a base plate, a sliding bearing means held by the base plate, a rotating shaft rotatably supported by the sliding bearing means, and a coil, provided on the base plate. A rotor that has a permanent magnet, is provided on the rotating shaft, and rotates around the axis of the rotating shaft with respect to the base plate by magnetic action between the stator and the base plate. A rotor guide piece provided in one area in the direction facing the movement path of the permanent magnet, the rotor guide piece changing the magnetic force acting on the permanent magnet in the axial direction in the circumferential direction, and the rotor guide piece is integrated with the base plate. It is a motor characterized by being formed.

According to the present invention, the rotor is provided on the rotating shaft supported by the sliding bearing means held on the base plate, and the rotor and the rotating shaft are rotated by a magnetic action between the rotor and the stator provided on the base plate. . Since the sliding bearing means needs to be supported so that the rotating shaft can rotate smoothly, a gap is formed between the rotating shaft and the sliding bearing means, and the existence of this gap causes the axis of the rotating shaft to be displaced. While rotating, a swing rotation occurs. In order to prevent this run-out rotation, a rotor guide piece made of a magnetic material is provided to change the magnetic force acting on the permanent magnet in the axial direction in the circumferential direction. In the region, the permanent magnet magnetically attracts the rotor guide piece, whereby the rotor and the rotating shaft are stably rotated with the rotor guide piece inclined to the side on which the rotor guide piece is provided. The rotor guide piece for preventing the run-out rotation is formed integrally with the base plate, so that the number of parts can be reduced as compared with the case where the rotor guide piece is formed separately as in the prior art. Naturally, as in the case of being formed separately, a fine work of bonding and fixing is not required, and the assembling work is also easy. Therefore, the manufacturing cost can be reduced.

According to a fifth aspect of the present invention, there is provided a stator having a base plate, a sliding bearing means held by the base plate, a rotating shaft rotatably supported by the sliding bearing means, and a coil, provided on the base plate. A rotor that has a permanent magnet, is provided on the rotating shaft, and rotates around the axis of the rotating shaft with respect to the base plate by magnetic action between the stator and the base plate. In one area in the direction, the rotor guide piece is provided facing the moving path of the permanent magnet and changes the magnetic force acting on the permanent magnet in the axial direction in the circumferential direction. A locking piece for locking the rotor for stopping, the rotor guide piece and the locking piece being aligned with the base plate at positions substantially symmetrical with respect to the axis of the rotating shaft. A motor which is characterized by being formed.

According to the present invention, the rotor is provided on the rotating shaft supported by the sliding bearing means held on the base plate, and the rotor and the rotating shaft are rotated by the magnetic action between the rotor and the stator provided on the base plate. . Since the sliding bearing means must be supported so that the rotating shaft can rotate smoothly, a gap is formed between the rotating shaft and the sliding bearing means, and the presence of this gap causes the axis of the rotating shaft to be displaced. While rotating, a swing rotation occurs. In order to prevent this run-out rotation, a rotor guide piece made of a magnetic material is provided to change the magnetic force acting on the permanent magnet in the axial direction in the circumferential direction. In the region, the permanent magnet magnetically attracts the rotor guide piece, whereby the rotor and the rotating shaft are stably rotated with the rotor guide piece inclined to the side on which the rotor guide piece is provided. A rotor is provided on the rotating shaft supported by the sliding bearing means held on the base plate,
The rotor and the rotating shaft are rotated by a magnetic action between the rotor and the stator provided on the base plate. In order to prevent the rotating shaft thus rotated from slipping out of the sliding bearing means, a locking piece is provided to lock the rotor.

The rotor guide piece for preventing run-out rotation and the locking piece for preventing the rotation shaft from being removed are integrally formed on the base plate, which is different from the case where they are formed separately as in the prior art. Thus, the number of parts can be reduced. As a matter of course, as in the case of being formed separately, there is no need for detailed work of mounting by caulking, mounting with screws, or adhesively fixing, and the assembly operation is also easy.
Therefore, the manufacturing cost can be reduced.

Further, the rotor guide piece and the locking piece are formed at positions substantially symmetrical with respect to the axis of the rotating shaft, so that a problem associated with the tilting of the rotating shaft can be suppressed. Specifically, when the rotor is moved in the axial direction and locked by the locking piece, and thus when the locking piece functions as a stopper, the rotating structure including the rotor and the rotating shaft is engaged. Since the displacement on the side locked by the stop piece is prevented, and the displacement on the side opposite to the side locked by the locking piece with respect to the axis of the rotating shaft is not prevented, the sliding bearing means of the rotating shaft is used. It tilts with the interpolated part as a fulcrum. At this time, the portion of the rotary shaft inserted into the sliding bearing means is shortened, so that the rotary component is largely inclined.
As described above, when the rotating shaft and the sliding bearing means are greatly inclined, and thus the angle between the axis of the rotating shaft and the axis of the sliding bearing means increases, abnormal contact, and hence the degree of contact with each other increases, and The inner peripheral surface and the outer peripheral surface of the rotating shaft may be damaged, causing abnormal noise. In addition, the inner peripheral surface of the sliding bearing means and the outer peripheral surface of the rotary shaft temporarily come into close contact with each other, so that a large driving torque which is originally unnecessary when the motor is started is required. On the other hand, as described above, the rotor guide piece is provided at a position substantially opposite to the locking piece with respect to the axis of the rotating shaft, and the magnetic attraction between the rotor guide piece and the permanent magnet causes The displacement on the side opposite to the side locked by the locking pieces can be suppressed. Therefore, it is possible to suppress the tilting of the rotating component, and to reduce the problems caused by the tilting.

[0024]

FIG. 1 is a sectional view showing a disk drive motor 30 according to an embodiment of the present invention.
FIG. 2 is a plan view of the disk drive motor 30 as viewed from above in FIG. FIG. 1 is a cross-sectional view taken along line II of FIG. The disk drive motor (hereinafter, sometimes simply referred to as “motor”) 30 is a motor for rotating and driving a floppy disk (abbreviation: FD, hereinafter sometimes simply referred to as “disk”) as a recording disk. is there. The motor 30 includes a base plate 31 and a sliding bearing 3 serving as sliding bearing means held by the base plate 31.
2, a rotating shaft 33 rotatably supported by a slide bearing 32, and a stator 3 provided on the base plate 31.
4 and a rotor 35 provided on the rotating shaft 33 and rotating around the axis L33 of the rotating shaft 33 with respect to the base plate 31 by a magnetic action between the stator and the stator 34. And a locking piece 36 for locking the rotor 35, and a ferromagnetic material.
In a region in the circumferential direction around the third axis L33, a rotor guide piece 39 provided near the movement path of the permanent magnet 56 that is a driving magnet of the rotor 35 is included.

FIG. 3 is a perspective view showing the base plate 31. The base plate 31 is made of a ferromagnetic material such as iron or steel, has a substantially disk shape, and has a flat and annular base portion 40 and a cylindrical shape projecting in one axial direction from an inner peripheral portion of the base portion 40. It has a support cylinder portion 41 and a plurality of mounting portions 42 protruding radially outward from a plurality of circumferentially spaced positions on the outer peripheral portion of the base portion 40. The base plate 31 is fixed to a body of a device to which the motor 30 is to be mounted, for example, by screwing a screw member inserted through a mounting hole of each mounting portion 42 to the body of the device to which the motor 30 is to be mounted. In the present embodiment, base plate 31 is arranged such that support cylinder 41 projects upward with respect to base 40. The base plate 31 is formed integrally from iron, which is a ferromagnetic material.
Here, iron includes carbon steel and alloy steel.

Referring again to FIGS. 1 and 2, a short-bottomed cylindrical thrust receiving member 43 is fitted to the base plate 31, for example, in a state of being fitted into the support cylindrical portion 41, and is, for example, bonded and fixed. The thrust receiving member 43 is provided near the base 40 of the support cylinder 41 so as to open in the same direction as the direction in which the support cylinder 41 protrudes from the base 40. Therefore, the lower part of the support cylinder part 41 is closed. The thrust receiving member 43 is made of, for example, the same material as the base plate 31.

The slide bearing 32 is made of a porous material containing an oil component as a lubricant, and is substantially cylindrical.
A flange part 4 protruding radially outward at one end in the axial direction
4 are formed. At the inner peripheral portion of the slide bearing 32, a concave groove which is depressed outward in the radial direction is formed at a central portion in the axial direction, and cylindrical support surfaces 45 are formed on both sides of the concave groove in the axial direction.
Are formed. The slide bearing 32 is partially fitted into the support cylinder 41 of the base plate 31 from the other end in the axial direction, and is held by the support cylinder 41. In this state, the other end in the axial direction is fitted into the thrust receiving member 43 and is supported from the axial direction.

The rotating shaft 33 is made of, for example, the same material as the base plate and is formed in a columnar shape. The rotating shaft 33 is partially inserted into the sliding bearing 32 and the sliding bearing 3
2, specifically, by a support surface 45 which is a part of the inner peripheral surface of the slide bearing 32, an outer peripheral surface 46 facing this support surface.
Are supported in the radial direction. In the state inserted in the slide bearing 32 in this manner, one axial end of the rotary shaft 33 is exposed from the slide bearing 32, and the other axial end of the rotary shaft 33 contacts the thrust receiving member 43, The thrust receiving member is supported from the axial direction, that is, from below. The outer diameter of the rotating shaft and thus the outer circumferential surface 46 so that the rotating shaft 33 can rotate smoothly around its axis L33.
Is the inner diameter of the bearing means 32 and therefore the bearing surface 45
Is formed smaller than the diameter of

The stator 34 is provided on the base plate 31 so as to be fitted to the support cylinder 41 of the base plate 31. The stator 34 includes a stator core portion 47 having core teeth 50 formed at intervals in a circumferential direction, and a coil 49 wound around each core tooth 50 of the stator core portion 47 via an insulating portion (not shown). Have. The stator 34 is, for example, adhered and fixed to the support cylinder 41, and the slide bearing 32 is fixed to the stator core 47 by a screw member 51.
While being held at 1, it is fixed to the base plate 31. Stator core 47 is made of a ferromagnetic material, for example, the same material as base plate 31.

The motor 30 is fixed to a side of the base 40 of the base plate 31 facing the stator 34, and a circuit board 53 is provided. The circuit board 53 is electrically connected to a power source (not shown) and also electrically connected to each coil 49. The circuit board 53 supplies a current to each coil 49 from the circuit board 53 to excite each coil 49. it can.

The rotor 35 includes, for example, the base plate 3
1 and a yoke 55 made of the same material as that of the first material. The yoke 55 is formed in a substantially bottomed cylindrical shape having a bottom plate 57 and a peripheral wall 58 connected to the outer peripheral portion 29 of the bottom plate 57. The bottom plate 57 is formed in a three-step shape, which is a plurality of steps, so as to shift to one side in the axial direction as it goes radially outward, and the inner peripheral portion 59, which is the innermost step, has an axial line at the center. A short columnar mounting portion 60 protrudes in one direction.
Is formed. The peripheral wall 58 has a short columnar shape and has a bottom plate 5.
7 is connected to the outermost peripheral portion of the outer peripheral portion 61 which is the outermost step so as to bend in one axial direction. The permanent magnet 56 is provided on the inner side in the radial direction of the peripheral wall 58, that is, on the inner side of the yoke 55, for example, by being adhered and fixed.

The rotor 35 has a rotating shaft 33 with a portion exposed from the sliding bearing 32 at one end in the axial direction of the rotating shaft 33 inserted into a mounting portion 60 of the yoke 55.
Fixed to With the yoke 55 fixed to the rotating shaft 33, the bottom plate 57 projects radially outward from the rotating shaft 33, and the peripheral wall 58 extends from the bottom plate 57 toward the other axial end of the rotating shaft 33, and thus toward the base plate 31. It is arranged to bend. The rotor 35 is provided so as to surround the stator 34 from the side opposite to the base plate 31 and from the radially outer side.

The permanent magnet 56 of the rotor 35 is
Are arranged facing each coil 49 of the stator 34. When the coils 49 of the stator 34 are excited, the rotor 35
And the permanent magnet 56, the base plate 31 is rotated about the axis L1 of the rotating shaft 33 with respect to the base plate 31. Therefore, the rotating shaft 3 to which the rotor 35 is fixed
3 is rotated about its axis L33.

The yoke 55 of the rotor 35 has
An annular mounting plate 6 is provided on an intermediate portion 62 serving as a step between the inner peripheral portion 59 and the outer peripheral portion 61 of the bottom plate 57 on the other axial side.
3 is fixed. A turntable is formed by the bottom plate 57 of the yoke 55 and the mounting plate 63, and more specifically, a disk is mounted on the inner peripheral portion 59 and the mounting plate 63 on this turntable. A drive pin 64 is provided on the yoke 57, and the pin body 65 is inserted into the engagement hole of the disk with the disk placed on the turntable, and the pin body 65 is engaged with the disk. You. In this state, the rotor 35 and thus the rotating shaft 3
3, rotor 35, mounting plate 63 and engagement pin 64
Is rotated about the axis L33, whereby the disk is rotationally driven.

In the rotating structure 70, the rotating shaft 33 is supported by the slide bearing 32 and the thrust bearing 43 and is supported from the radial direction and from below, but is supported in the direction opposite to the thrust bearing 43 and therefore from above. It has not been. The magnetic pole center line 5 which is the center of the magnetic pole in the axial direction of the permanent magnet 56 constituting a part of such a rotating component 70
6a is in a direction away from the base plate 31 with respect to the axial direction of the rotating shaft 33 than a magnetic pole center line 50a which is a center of an axial magnetic pole formed on each core tooth 50 when each coil 49 is excited. They are arranged shifted by the distance ΔX. Thereby, the stator 48 and the permanent magnet 5
6, in addition to the above-described rotating action on the stator 48, a magnetic action acts on the stator 48 so that the permanent magnet 56 is directed toward the base plate 31 and is thus magnetically attracted downward. Therefore, the rotating component 70 can be magnetically attracted downward in addition to the action of gravity caused by its own weight, thereby preventing the rotating component 70 from floating due to vibration or the like during the rotation operation, and The disk can be driven to rotate stably.

Referring to FIGS. 1 to 3, in order to obtain such a stable rotation of the rotating member 70, the rotating member 70 is sucked downward by the action of gravity and magnetic action accompanying its own weight. In addition to the configuration described above, a locking piece 36 is further provided. The locking piece 36 is attached to the base 4 of the base plate 31.
0, and a second portion bent from the tip end portion of the pillar portion 73, that is, the upper end portion, toward the support cylinder portion 41, and thus inward in the radial direction.
It has a hook-shaped portion 74 as one piece, and has a substantially L-shaped cross section. The column portion 73 is located outside the rotor 35 at the yoke 55
The hook-shaped portion 74 rises above the outer peripheral portion 61 and is lower than the outer peripheral portion 61 and below the intermediate portion 62.
It protrudes radially inward from the peripheral wall 58 of the yoke 55.

The provision of the locking piece 36 prevents the rotating shaft 33 from being completely removed from the sliding bearing 32 even when a force for displacing the rotating component 70 in a direction away from the base plate 31 is applied. be able to. This prevents the rotating shaft 33 and therefore the rotating component 70 from slipping out of the sliding bearing 32 even if the rotating component 70 is pulled by being caught on an article such as a disk. In addition, it is possible to prevent the rotating component 70 from slipping out, for example, during transportation of a device provided with the motor 30.

Referring also to FIG. 3, such a locking piece 3
6 is formed integrally with the base plate 31. Specifically, the locking piece 36 is formed of the base plate 31 and the locking piece 3.
As shown in FIG. 3, a plate-shaped material for forming
The base plate 31 and the locking piece 36 are integrally formed, and the locking piece 36 is formed by press molding so as to protrude radially outward from the base plate 31. The locking piece 36
In addition to the pillar portion 73 and the hook portion 74, a connection portion 75 that connects the base end portion of the pillar portion 73 to the base portion 40 of the base plate 31, and a connection portion that connects the tip end portion of the pillar portion 73 to the hook portion 74. A portion 76. The width W1 of the pillar portion 73 and the hook portion 74 is the same, and the width W2 of each of the connecting portions 75 and 76 is the same, and is smaller than the width W1 of the pillar portion 73 and the hook portion 74.

The locking piece 36 has a column 73 connected to the base plate 31 by a connecting portion 75 at the center in the width direction of the base end portion, and a center in the width direction of the tip portion of the column portion 73 and the hook-shaped portion 74.
The base in the width direction is connected to the center in the width direction by the connecting portion 76, and as described above, when formed as shown in FIG. In the previous expanded state. After the slide bearing 32, the rotating shaft 33, the stator 34, the rotor 35, the circuit board 53, and the like are assembled on the base plate 31, the connecting portion 75 is bent so that the column portion 73 is arranged to rise from the base 40, The connecting portion 76 is bent so that the hook portion 74 is bent and disposed with respect to the column portion 73,
In the position shown by the phantom line in FIG. 3 and therefore in the position shown in FIGS. 1 and 2, the hook-shaped portion 74 finally connects the outer peripheral portion 61 of the yoke 55 of the rotor 35 to the base plate 3
It is assembled so that it can be locked from the opposite side of the one base 40, and therefore from above.

As described above, the locking piece 36 for locking the rotor 35 to prevent the rotation shaft 33, and hence the rotating component 70 from being removed, is formed integrally with the base plate 31, so to speak, as a single member. The number of parts can be reduced as compared with the case of forming separately as in the prior art. As a matter of course, as in the case of being formed separately, there is no need for a detailed operation of mounting by caulking or using screws, and the assembling operation is also easy. Specifically, the locking piece 36
Can be assembled by a simple operation simply by bending the connecting portions 75 and 76, and furthermore, the connecting portions 75 and 76 can be assembled.
The width W2 is selected to be smaller than the width W1 of the pillar 73 and the hook 74, and the connecting portions 75 and 76 are deformed without deforming the pillar 73 and the hook 74.
The locking piece 36 can be easily assembled in a predetermined state. Each connecting portion 75, 76 has its width W2 and locking piece 3
Based on the material from which 6 is formed, it is formed in such a strength that it can be bent manually by a worker or can be bent manually by using a tool. Column 7
The width W1 of each of the hooks 5 and the hooks 76 is selected so as to have a strength not deformed by the above-described manual bending operation. The locking piece 36 only needs to be able to prevent the rotation component 70 from coming off, and the shape and position in the assembled state do not require high precision, and only the above-described manual connection portions 75 and 76 are used. An assembling precision sufficient to bend and assemble is sufficient, so that the locking piece 36 can be easily assembled manually. Therefore, the manufacturing cost can be reduced. Note that the locking piece 36 is not limited to be set to such a degree that it can be bent manually to secure the strength and prevent deformation. It may be set to the extent that it is possible.

Further, by disposing the column portion 73 in the first piece portion radially outward of the rotor 35, it is possible to prevent the rotation shaft 33 from coming off the slide bearing 32 regardless of the shape of the rotor 35. Therefore, as described above, the rotor 35
An engagement pin 64 engaged with the disk is provided inside the disk drive, and the disk drive motor 30 having a configuration in which it is difficult to lock the rotor 35 on the inside can be suitably implemented.

FIG. 4 is a perspective view showing the rotor guide piece 39. Referring to FIGS. 1 to 3 together, the bearing means 32
Since it is necessary to support the rotating shaft 33 so that it can rotate smoothly, a gap is formed between the rotating shaft 33 and the bearing means 32, and the existence of this gap causes the axis L33 of the rotating shaft 33 to be displaced. While rotating, a swing rotation occurs. In order to prevent this swing rotation, a rotor guide piece 39 made of a ferromagnetic material is provided. The rotor guide piece 39 is formed in one circumferential region of the outer peripheral portion of the base 40 of the base plate 31, more specifically, at a position symmetrical to the locking piece 36 with respect to the axis L33 of the rotating shaft 33. The rotor guide piece 39 is formed by a pillar 80 rising from the base 40.
And a hook-like portion 81 that is bent away from the support cylinder 41 from the tip end portion of the column portion 80, and thus from the upper end portion, and thus is bent outward in the radial direction, and has a substantially L-shaped cross section. You. The column portion 80 rises from below the inner peripheral side of the moving path of the permanent magnet 56 of the rotor 35 to near the moving path of the permanent magnet 56, and the hook-shaped portion 81 is below the moving path of the permanent magnet 56, It protrudes radially outward of the movement path. The rotor guide piece 39 is
In addition, a member facing the moving path of the permanent magnet 56 from below, in the present embodiment, closer to the moving path of the permanent magnet 56 than the base 40 of the base plate 31.

When the rotating member 70 is rotated, the magnetic attraction force acting between the permanent magnet 56 and the rotor guide piece 39 is compared with the unit length in the circumferential direction.
It becomes larger than the magnetic attraction force acting between the base plate 40 and the base 40 of the base plate 31. That is, the magnetic balance changes in the circumferential direction between the permanent magnet 56 and the base plate. In other words, the magnetic force acting downward on the permanent magnet 56 in the axial direction is changed, and a magnetic imbalance is generated between the rotor 35, the base plate 31, and the guide piece 39 in the circumferential direction. As a result, the permanent magnet 56 moves the base plate 3 when moving along the moving path portion facing the rotor guide piece 39 in the circumferential direction as compared with when moving along the remaining moving path portion.
It is magnetically attracted downward so as to approach the first base 40. Therefore, as described above, the rotating shaft 33 and the sliding bearing 32
Even if a gap is formed between the rotating member 70 and the rotating member 70 including the rotor 3 and the rotating shaft 33, the permanent magnet 56 magnetically attracts the rotor guide piece 39 in one circumferential region around the axis L33. The axis L33 of the rotating shaft 33 is the bearing means 3
The rotor is stably rotated in a state where the rotor guide piece 39 is inclined with respect to the second axis.

The rotor guide piece 39 is formed integrally with the base plate 31. Specifically, the rotor guide piece 39 includes the base plate 31 and the locking piece 36 described above.
A portion for forming the rotor guide piece 39 is provided on a plate-like material for forming the same, and is integrally connected to the base plate 31 as shown in FIG. It is formed by press molding so as to project in the direction.

As described above, the rotor guide piece 39 for preventing the run-out rotation is formed integrally with the base plate 31, so that the number of parts can be reduced as compared with the case where the rotor guide piece 39 is formed separately as in the prior art. it can. Naturally, as in the case of being formed separately, a fine work of bonding and fixing is not required, and the assembling work is also easy. Therefore, the manufacturing cost can be reduced.

Further, since the rotor guide piece 39 comes close to the moving path of the permanent magnet 56 in the rotor 35 and thus the rotating structure 70 in a non-contact manner, a large strength is not required, and the rotor guide piece 39 is connected to the base plate 31 only on the radially inner side. Therefore, the shape may be L-shaped as described above, and in this case, the manufacturing is easier as compared with the case where the protrusion is formed by squeezing described later.
In addition, the non-contact type rotor guide piece 39 does not require a high accuracy with respect to the positional accuracy, so that the manufacturing is also easy.

Further, the rotor guide piece 39 and the locking piece 36 are formed at positions that are symmetrical with respect to the axis L33 of the rotating shaft 33, so that the problem associated with the tilting of the rotating shaft 33 can be reduced. Specifically, when the disk is placed on the turntable and when the disk is removed from the turntable, the rotor 35
Is rotated in the axial direction and is locked by the locking piece 36, and thus when the locking piece 36 functions as a stopper, the rotating structure 70 including the rotor 35 and the rotating shaft 33 is driven by the locking piece. 36 is prevented from being displaced.
In addition, since the displacement on the side opposite to the side locked by the locking piece 36 with respect to the axis L33 of the rotary shaft 33 is not prevented, the portion of the rotary shaft 33 inserted into the slide bearing 32 is tilted with a so-called fulcrum. Would. At this time, the portion of the rotating shaft 33 inserted into the slide bearing 32 is shortened, and the rotating component 70 is greatly inclined. When the rotating shaft 33 and the slide bearing 32 are greatly inclined in this manner, the rotating shaft 33
When the angle between the axis L33 of the sliding bearing 32 and the axis of the sliding bearing 32 increases, abnormal contact, and hence the degree of contact with one another, increases, and the inner peripheral surface of the sliding bearing 32 and the outer peripheral surface of the rotating shaft 33 are damaged, resulting in abnormal noise. It causes the occurrence. In addition, the inner peripheral surface of the slide bearing 32 and the outer peripheral surface of the rotary shaft 33 are temporarily brought into close contact with each other, and a large driving torque which is originally unnecessary when starting the motor is required. On the other hand, as described above, the rotor guide piece 39 is provided at a position opposite to the locking piece 36 with respect to the axis L33 of the rotary shaft 33, and the rotor guide piece 3
Due to the magnetic attraction between the magnet 9 and the permanent magnet 56, the displacement of the rotating component 70 on the side opposite to the side locked by the locking piece 36 can be suppressed. Therefore, it is possible to suppress the tilting of the rotating component, and to reduce the problems caused by the tilting.

FIG. 5 is a perspective view showing the engagement pin 64. The engagement pin 64 has a flat plate-shaped mounting portion 82 in addition to the pin main body 65. The mounting portion 82 has an arc shape and has a mounting hole 83 at one end. A mounting projection 84 is formed on the yoke 55 of the rotor 35 so as to be continuous with the intermediate portion 62 of the bottom plate 57, and when the mounting projection 84 is inserted through the mounting hole 83, an external force is applied to the mounting portion 82. Is fixed to the yoke 55 of the rotor 35 by so-called caulking so that the mounting projection 84 is firmly gripped. With the one end fixed to the yoke 55, the mounting portion 82 of the engagement pin 64 extends along the circumferential direction around the axis L33 of the rotating shaft 33.

A pin body 65 is formed integrally with the mounting portion 82 of the engaging pin 64 at the other end. The pin body 65 has a bottomed cylindrical shape and has a mounting portion 8 at an open end.
It is connected to two. The pin body 65 protrudes upward in the direction away from the open end of the yoke 55 with respect to the mounting portion 82. Through holes 87 and 88 are formed in the yoke 55 and the mounting plate 63, respectively, and the pin body 65 of the engaging pin 64 is connected to the through holes 87 and 8 respectively.
8 protrudes above the mounting plate 63. The portion of the pin body 65 protruding from the mounting plate 63 is fitted into the engagement hole of the disk, and the engagement pin 64 and the disk are engaged.

The disc 64 and the pin body 65 undesirably interfere with each other until the pin body 65 and the disc engaging hole coincide with each other when the disc is placed. In order to prevent the motor 30 and / or the disc from being damaged due to this interference, one end of the mounting portion 82 is fixed to the yoke 55, and the pin body 65 is attached to the mounting portion 8
2 is provided at the other end. Thus, when the pin body 65 is in a positional relationship of interfering with the disk, the mounting portion 82 is elastically deformed, and the pin body 65 can be retracted downward.

In the peripheral wall 90 of the pin body 65, a displacement limiting hole 92 extending in the circumferential direction is formed in a partial area near one end of the mounting portion 82. The displacement limiting hole 92 is formed such that the width W5 in the axial direction (vertical direction) is larger than the thickness of the intermediate portion 62 of the bottom plate 57 of the yoke 55. The through hole 88 formed in the mounting plate 63 is formed to be larger on the mounting cylinder portion 84 side for mounting the engaging pin 64 in the circumferential direction than the through hole 87 formed in the intermediate portion 62 of the yoke 55. I have. In other words, the intermediate portion 62 of the yoke 55
Is formed such that a portion 62a facing the through hole 87 from the mounting cylinder portion 84 side in the circumferential direction projects from a portion 63a facing the through hole 88 of the mounting plate 63 from the mounting cylinder portion 84 side in the circumferential direction, The protruding portion 62 a fits into the displacement limiting hole 92 of the pin body 65.

As a result, the engagement pin 64 is moved to the yoke 62
Can be displaced within a range limited by the portion 62a. The engagement pin 64 has a position at which the end wall 91 of the pin body 65 is disposed above the inner peripheral portion 59 of the yoke 55 and the mounting plate 63, and a position at which the end wall 91 of the pin body 65 is located at the inner peripheral portion of the yoke 55. It can be displaced between positions located below 59. Therefore, when the pin body 65 is pressed by the disc, the pin body 65 can be prevented from being retracted beyond the allowable range, and the displacement of the engaging pin 64 can be limited. 64 is deformed to the extent that it is plastically deformed,
In addition, it is possible to prevent a decrease in elasticity due to repeated elastic deformation with a large displacement. This prevents the engagement pin 64 from being damaged.

FIG. 6 is a perspective view showing a locking piece 36A according to another embodiment of the present invention. This embodiment is shown in FIGS.
This embodiment is similar to the above-described embodiment shown in FIG. 5, and only different points will be described, and the same components will be denoted by the same reference numerals and description thereof will be omitted. FIG. 6 shows the base plate 31.
And the rotor guide piece 39 before being assembled. This locking piece 36A is in an assembled state,
A pillar 73A that rises from the outer periphery of the base 40 of the base plate 31; and a hook-like portion 74A that bends from the tip of the pillar 73A, and therefore from the upper end, toward the support cylinder 41, and thus radially inward. Having a substantially L-shaped cross section. The pillar portion 73A rises up to a position higher than the outer peripheral portion 61 of the yoke 55 outside the rotor 35, and
4A projects above the outer peripheral portion 61 and below the intermediate portion 62 and radially inward from the peripheral wall 58 of the yoke 55. This locking piece 36A is the same as the locking piece 3 described above.
Similarly to 6, the rotor 35 can be locked to prevent the rotating component 70 from being pulled out.

The locking piece 36A is formed by press forming integrally with the base plate 31 and the rotor guide piece 39, similarly to the locking piece 36 described above. Specifically, the locking piece 36A is made of a plate-like material for forming the base plate 31, the locking piece 36A and the rotor guide piece 39, and the base plate 31 and the locking piece 36A are integrally connected to each other. Are formed by press molding in a shape extending in the circumferential direction outside the base plate 31 in the radial direction. Locking piece 3
6A is a connecting portion 75A connecting the base end portion of the pillar portion 73A and the base portion 40 of the base plate 31 in addition to the pillar portion 73A and the hook-shaped portion 74A, and a base portion of the tip end portion of the pillar portion 73A and the hook-shaped portion 74A. And a connecting portion 76A connecting the end portion. The width W1 of the pillar portion 73A and the hook-shaped portion 74A is the same, and the width W2 of each of the connecting portions 75A and 76A is the same and smaller than the width W1 of the pillar portion 73A and the hook-shaped portion 74A.

As shown in FIG. 6, at the time of press forming, the locking piece 36A is connected to the base plate 31 by the connecting portion 75A on one side in the width direction of the base end portion, and the width of the distal end portion of the pillar portion 73A. The center in the width direction and the center in the width direction of the base end portion of the hook-shaped portion 74A are connected by a connecting portion 76A, and extend in the circumferential direction radially outward of the base plate 31 during molding as described above, as shown in FIGS. Thus, the assembled state is in the unfolded state before assembly. Plain bearing 32, rotating shaft 3 on base plate 31
3. After the stator 34, the rotor 35, the circuit board 53 and the like are assembled, the connecting portion 75A is torsionally deformed,
The pillar portion 73 is arranged so as to rise from the base portion 40 with its thickness direction substantially coincident with the radial direction, and the connecting portion 76 is provided.
Is bent so that the hook-shaped portion 74 is bent with respect to the pillar portion 73, and is assembled at a position indicated by a virtual line in FIG. In this state, the hook portion 74 is moved to the outer peripheral portion 61 of the yoke 55 of the rotor 35.
Can be locked from the side opposite to the base 40 of the base plate 31, and therefore from above.

The locking piece 36A can achieve the same effect as the locking piece 36. In addition, locking piece 3
6A is press-formed so as to extend in the circumferential direction along the outer peripheral portion of the base portion 40 of the base plate 31, and then deformed and assembled as described above. The locking piece 36A is attached to the base 40.
By press-forming along the outer peripheral portion, the material removal during the press-forming is better than when the locking piece projects greatly outward in the radial direction like the locking piece 36 of the above-described embodiment. Therefore, the waste part around the molded article made of the raw material can be reduced, the yield can be improved, and the manufacturing cost can be reduced.

FIG. 7 is a perspective view showing a locking piece 36B and a rotor guide piece 39B according to still another embodiment of the present invention. This embodiment is similar to each of the above-described embodiments shown in FIGS. 1 to 6, and only different points will be described. In FIG. 7, it is shown together with the base plate 31B,
The locking piece 36B is shown before being assembled.
The locking piece 36B is, in the assembled state, a pillar 73B that rises from the outer periphery of the base 40 of the base plate 31, and a support cylinder 41 from the tip of the pillar 73B, and thus from the upper end.
, And accordingly, a hook-shaped portion 74B that bends inward in the radial direction, and has a substantially L-shaped cross section. The pillar portion 73B rises up to a position higher than the outer peripheral portion 61 of the yoke 55 outside the rotor 35, and the hook-shaped portion 74B is higher than the outer peripheral portion 61 and lower than the intermediate portion 62 and higher than the peripheral wall 58 of the yoke 55. It protrudes inward in the radial direction. This locking piece 36B is similar to the locking piece 36 described above,
By locking the rotor 35, it is possible to prevent the rotating component 70 from being pulled out.

The locking piece 36B is similar to the locking piece 36 described above, and has a base plate 31B and a rotor guide piece 39.
It is formed by press molding integrally with B. Locking piece 36B
Is formed by punching out the remaining area excluding one area in the circumferential direction of the part of the base plate 31B facing the movement path of the permanent magnet 56 made of the material. The rotor guide piece 39B is formed in an arc shape in a circumferential area of a portion of the base plate 31B facing the movement path of the permanent magnet 56 by punching out the locking piece 36.

More specifically, the locking piece 36B is a plate-like material for forming the base plate 31B, the locking piece 36B and the rotor guide piece 39B, and the base plate 31B and the locking piece 36B are integrally connected. The stop piece 36B is formed by press molding to a shape extending in the circumferential direction radially inward of the outer peripheral portion of the base 40B of the base plate 31B. The locking piece 36B includes, in addition to the pillar portion 73B and the hook-shaped portion 74B, the base end portion of the pillar portion 73B and the base plate 31B.
A connecting portion 75B for connecting the base portion 40B to the base portion 40B, and a pillar portion 73B
And a connecting portion 76B for connecting the distal end portion of the hook-shaped portion 74B and the base end portion of the hook-shaped portion 74B. The width W1 of the pillar portion 73B and the hook-shaped portion 74B is the same, and the width W2 of each of the connecting portions 75B and 76B.
Are the same, and are smaller than the width W1 of the pillar 73B and the hook 74B.

In the present embodiment, the base plate 3
The base 40B of the inner peripheral portion 1B includes an annular inner peripheral portion 100 and an inner peripheral portion 1B.
Annular outer peripheral portion 1 having an inner diameter larger than the outer diameter of 00
01. The inner peripheral portion 100 and the outer peripheral portion 101 are connected to the respective portions 100 and 101 by a rotor guide piece 39B formed in a flat arc shape, and a base portion 40B.
And a rotor guide piece 39B. An arc-shaped through-hole 103 extending in the circumferential direction, which is surrounded by the respective parts 100 and 101 from the radial direction on the outer periphery thereof and surrounded by both ends of the rotor guide piece 39B from the circumferential direction. Is formed. The rotor guide piece 39B is connected to the center line 10 of the movement path of the permanent magnet 56.
5, and the through-hole 103 is also formed along the center line 105.

As shown in FIG. 6, the engaging piece 36B is formed so as to fit into the through hole 103 during press molding.
The pillar portion 73B is connected to the outer peripheral portion 101 of the base portion 40B by a connecting portion 75B on one side in the width direction of the base end portion, and the widthwise center of the tip end portion of the pillar portion 73B and the widthwise center of the base end portion of the hook-shaped portion 74B. Are connected by the connecting portion 76B, and extend in the radial direction inward in the radial direction of the base portion 40B at the time of molding as described above, and as shown in FIGS. It is in the state where it was. A slide bearing 32, a rotating shaft 33, a stator 34,
After the rotor 35 and the circuit board 53 are assembled,
The connecting portion 75B is torsionally deformed so that the pillar portion 73B is arranged so as to rise from the base portion 40B so that the thickness direction thereof substantially coincides with the radial direction, and the connecting portion 76B is bent so that the hook-like portion 74B becomes the pillar portion 73B. FIG. 9
Is assembled at a position indicated by a virtual line. In this state, the hook-shaped portion 74B can lock the outer peripheral portion 61 of the yoke 55 of the rotor 35 from the side opposite to the base portion 40B of the base plate 31, that is, from above.

The locking piece 36B can achieve the same effect as the locking piece 36. In addition, locking piece 3
6B is press-formed so as to extend in the circumferential direction inside the base 40B of the base plate 31B, and then deformed and assembled as described above. By forming the locking piece 36B inside the base 40B, compared to the case where the locking piece is formed outside the base as in each of the above-described embodiments, the periphery of the material molded article is discarded during press molding. Waste can be further reduced, yield can be improved,
Therefore, the manufacturing cost can be reduced.

In this manner, the locking piece 36B is connected to the permanent magnet 5
In the assembled state, the ferromagnetic material does not come into contact with the permanent magnet 56 in the region where the through-hole 103 is formed in the circumferential direction, and the remaining region in the region where the through hole 103 is formed. Rotor guide piece 3 made of ferromagnetic material
9B appears, and the magnetic balance changes in the circumferential direction as in the above-described embodiments. The rotor guide piece 39B having such a configuration can also achieve the same effect as the rotor guide piece 39 described above. In addition, in such a configuration, the rotor guide piece 39B is formed inevitably by punching out the locking piece 36B, and is formed substantially symmetrically with respect to the axis L33, and may be flush with the base 40B. There is no need for processing for protruding from the base portion 40B as in the case of the piece 39, so that manufacturing can be further facilitated and manufacturing cost can be further reduced. In addition, the effect of forming the rotor guide piece 39B and the locking piece 36B at the symmetrical position is also achieved.

FIG. 8 is a perspective view showing a rotor guide piece 39C according to still another embodiment of the present invention. This embodiment is similar to the above-described embodiments shown in FIGS. 1 to 5, and only different points will be described. Parts having the same configuration will be denoted by the same reference numerals and description thereof will be omitted. FIG. 10 shows the base plate 31C and the locking pieces 36 together with the locking pieces 36 before being assembled. The rotor guide piece 39C is formed to extend in the circumferential direction in an arc shape at a position facing the movement path of the permanent magnet 56 when assembled. The peripheral edge of the rotor guide piece 39C is continuous with the base 40 over the entire circumference, and protrudes to the same side as the support cylinder 41. The rotor guide piece 39C is formed by squeezing when the material forming the base plate 31, the locking piece 36, and the rotor guide piece 39C is pressed.

Like the rotor guide piece 39, the rotor guide piece 39C is closer to the moving path of the permanent magnet 56 than the base 40, and is magnetically similar to the circumferential direction as in the above-described embodiments. The balance changes. The rotor guide piece 39C having such a configuration can also achieve the same effect as the rotor guide piece 39 described above. In addition, in such a configuration, the peripheral edge of the rotor guide piece 39B is continuous with the base 40 on the entire circumference, has sufficient strength, exhibits a function as a rib, and is unlikely to deform the base 40 of the base plate 31. At the same time, the structure can be made to be greatly raised. Therefore, the rotor guide piece 39B can be raised larger than the rotor guide piece 39 described above, and can be brought closer to the permanent magnet 56. In order to bring the rotor guide piece 39 closer to the permanent magnet 56 (to make it protrude greatly), the cut amount of the base plate 31 must be increased accordingly. For example, the mounting of the circuit board 53 and the mounting of a device provided with a motor to the body are required. It is formed in consideration of. Although the shape of the base portion 40 is different from the form in which the rotor guide piece 39 is provided, since the shape is substantially circular, detailed description is omitted.

As is clear from the drawings referred to in the above embodiments, each rotor guide piece 39, 39B, 3
Although the circumferential length of 9C is different, each rotor guide piece 39,
39B and 39C may be obtained by changing the magnetic balance in the circumferential direction, that is, the magnetic attraction force in which the permanent magnet 56 is attracted downward, in the circumferential direction. May be appropriately selected in consideration of the above.

The above embodiment is merely an example of the present invention, and the configuration can be changed within the scope of the present invention. For example, each of the locking pieces 36, 36A, 36B has a hook portion 74, 74A, 74B located above the outer peripheral portion 61 of the yoke 55, but a flange portion is provided outside the lower end of the peripheral wall 58. It may be located above the part. Also, the locking pieces 36, 36A, 36B are connected to the connecting portions 75, 75.
A, 75B, 76, 76A, and 76B are provided to facilitate the bending operation. However, the same effect may be obtained by simply forming a bending line and a cut line, or may be omitted altogether. Further, the base plates 31, 31B, 31C are substantially disc-shaped, but may be rectangular or other geometric shapes in connection with the attachment of the device to the body, to which the motor is to be attached. The shape of each of the locking pieces 36, 36A, 36B is not a linear shape or an arc shape, but may be another shape in consideration of material removal or the like. Instead of a disk drive motor,
It may be realized as a motor for other uses, for example, a fan driving motor. It is also possible to provide a locking piece inside the rotor 35. In addition, each locking piece 36, 36A, 3
6B and the respective rotor guide pieces 39, 39B, 39C are not limited to the above-described combination, and may be appropriately selected and combined. Further, a dynamic pressure bearing may be used as the bearing means for supporting the rotating shaft 33 instead of the slide bearing 32.

[0068]

According to the present invention, the rotor is provided on the rotating shaft supported by the sliding bearing means held on the base plate, and the rotor is provided by a magnetic action between the rotor and the stator provided on the base plate. And the rotating shaft is rotated. In order to prevent the rotating shaft thus rotated from slipping out of the sliding bearing means, a locking piece is provided to lock the rotor. The locking piece for preventing the rotation shaft from being removed is formed integrally with the base plate, and the number of parts can be reduced as compared with the case where the locking piece is formed separately as in the prior art. As a matter of course, as in the case of being formed separately, there is no need for a detailed operation of mounting by caulking or using screws, and the assembling operation is also easy. Therefore, the manufacturing cost can be reduced.

According to the second aspect of the present invention, in the locking piece, the first piece portion is disposed radially outward of the rotor,
The rotor can be locked by the second piece.
By arranging the first piece in the radially outward direction of the rotor in this manner, it is possible to prevent the rotation shaft from coming off from the sliding bearing means regardless of the shape of the rotor. An engaging pin to be engaged is provided, and the present invention can be suitably applied to a disk drive motor or the like which is hardly locked from the inside.

According to the third aspect of the present invention, a rotor guide piece made of a magnetic material is provided to prevent run-out rotation, and the magnetic force acting on the permanent magnet in the axial direction is changed in the circumferential direction. Specifically, in one region in the circumferential direction around the axis of the rotating shaft, the permanent magnet magnetically attracts the rotor guide piece, whereby the rotor and the rotating shaft are stably tilted to the side where the rotor guide piece is provided. Rotated. The run-out rotation here needs to be supported by the sliding bearing means so that the rotating shaft can rotate smoothly. Therefore, a gap is formed between the rotating shaft and the sliding bearing means. Means the rotation while the axis of the rotating shaft is displaced. The rotor guide piece to prevent such run-out rotation,
The locking piece is formed by punching the remaining area of the base plate material facing the movement path of the permanent magnet except for the one area in the circumferential direction, thereby forming the periphery of the part of the base plate material facing the movement path of the permanent magnet. An arc is formed in one area in the direction. As described above, the rotor guide piece is formed integrally with the base plate, so that the number of parts can be reduced as compared with the case where the rotor guide piece is formed separately as in the prior art. Naturally, as in the case of being formed separately, a fine work of bonding and fixing is not required, and the assembling work is also easy.
Therefore, the manufacturing cost can be reduced. Further, by punching out the locking pieces, the rotor guide pieces are also formed, so that the processing time can be reduced.

According to the fourth aspect of the present invention, the rotor is provided on the rotating shaft supported by the slide bearing means held on the base plate, and the rotor and the rotating member are rotated by magnetic action between the rotor and the stator provided on the base plate. The shaft is rotated. Since the sliding bearing means needs to be supported so that the rotating shaft can rotate smoothly, a gap is formed between the rotating shaft and the sliding bearing means, and the existence of this gap causes the axis of the rotating shaft to be displaced. While rotating, a swing rotation occurs. In order to prevent this run-out rotation, a rotor guide piece made of a magnetic material is provided to change the magnetic force acting on the permanent magnet in the axial direction in the circumferential direction. In the region, the permanent magnet magnetically attracts the rotor guide piece, whereby the rotor and the rotating shaft are stably rotated with the rotor guide piece inclined to the side on which the rotor guide piece is provided. The rotor guide piece for preventing the run-out rotation is formed integrally with the base plate, so that the number of parts can be reduced as compared with the case where the rotor guide piece is formed separately as in the prior art. Naturally, as in the case of being formed separately, a fine work of bonding and fixing is not required, and the assembling work is also easy. Therefore, the manufacturing cost can be reduced.

According to the fifth aspect of the present invention, the rotor is provided on the rotating shaft supported by the sliding bearing means held on the base plate, and the rotor and the rotating member are rotated by magnetic action between the rotor and the stator provided on the base plate. The shaft is rotated. Since the sliding bearing means must be supported so that the rotating shaft can rotate smoothly, a gap is formed between the rotating shaft and the sliding bearing means, and the presence of this gap causes the axis of the rotating shaft to be displaced. While rotating, a swing rotation occurs. In order to prevent this run-out rotation, a rotor guide piece made of a magnetic material is provided to change the magnetic force acting on the permanent magnet in the axial direction in the circumferential direction. In the region, the permanent magnet magnetically attracts the rotor guide piece, whereby the rotor and the rotating shaft are stably rotated with the rotor guide piece inclined to the side on which the rotor guide piece is provided. Further, a rotor is provided on a rotating shaft supported by a slide bearing means held on the base plate, and the rotor and the rotating shaft are rotated by a magnetic action between the rotor and a stator provided on the base plate. In order to prevent the rotating shaft thus rotated from slipping out of the sliding bearing means, a locking piece is provided to lock the rotor.

The rotor guide piece for preventing run-out rotation and the locking piece for preventing the rotation shaft from being removed are integrally formed on the base plate, which is different from the case where they are formed separately as in the prior art. Thus, the number of parts can be reduced. As a matter of course, as in the case of being formed separately, there is no need for detailed work of mounting by caulking, mounting with screws, or adhesively fixing, and the assembly operation is also easy.
Therefore, the manufacturing cost can be reduced.

Further, the rotor guide piece and the locking piece are formed at positions substantially symmetrical with respect to the axis of the rotating shaft, so that it is possible to make it less likely that a problem associated with the tilting of the rotating shaft will occur. Specifically, when the rotor is moved in the axial direction and locked by the locking piece, and thus when the locking piece functions as a stopper, the rotating structure including the rotor and the rotating shaft is engaged. Since the displacement on the side locked by the stop piece is prevented, and the displacement on the side opposite to the side locked by the locking piece with respect to the axis of the rotating shaft is not prevented, the sliding bearing means of the rotating shaft is used. It tilts with the interpolated part as a fulcrum. At this time, the portion of the rotary shaft inserted into the sliding bearing means is shortened, so that the rotary component is largely inclined.
As described above, when the rotating shaft and the sliding bearing means are greatly inclined, and thus the angle between the axis of the rotating shaft and the axis of the sliding bearing means increases, abnormal contact, and hence the degree of contact with each other increases, and The inner peripheral surface and the outer peripheral surface of the rotating shaft may be damaged, causing abnormal noise. In addition, the inner peripheral surface of the sliding bearing means and the outer peripheral surface of the rotary shaft temporarily come into close contact with each other, so that a large driving torque which is originally unnecessary when the motor is started is required. On the other hand, as described above, the rotor guide piece is provided at a position substantially opposite to the locking piece with respect to the axis of the rotating shaft, and the magnetic attraction between the rotor guide piece and the permanent magnet causes The displacement on the side opposite to the side locked by the locking pieces can be suppressed. Therefore, it is possible to suppress the tilting of the rotating component, and to reduce the problems caused by the tilting.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a disk drive motor 30 according to an embodiment of the present invention.

FIG. 2 is a plan view of a disk drive motor 30.

FIG. 3 is a perspective view showing a locking piece 36;

FIG. 4 is a perspective view showing a rotor guide piece 39;

FIG. 5 is a perspective view showing an engagement pin 64;

FIG. 6 is a perspective view showing a locking piece 36A according to another embodiment of the present invention.

FIG. 7 shows a locking piece 36B according to still another embodiment of the present invention.
It is a perspective view which shows the rotor guide piece 39B.

FIG. 8 is a perspective view showing a rotor guide piece 39C according to still another embodiment of the present invention.

FIG. 9 is a sectional view showing a conventional disk drive motor 1.

FIG. 10 is a plan view of the disk drive motor 1.

[Explanation of symbols]

 Reference Signs List 30 disk drive motor 31 base plate 32 sliding bearing 33 rotating shaft 34 stator 35 rotor 36, 36A, 36B locking piece 39, 38B, 38C rotor guide piece 40 base 41 support cylinder 48 stator core 49 core tooth 55 yoke 56 permanent magnet 64 , 64D engagement pin

Continued on the front page F term (reference) 3J011 AA01 BA04 CA02 MA21 5H605 AA07 AA08 BB05 BB19 CC01 CC02 DD09 EB03 EB06 EB22 GG04 GG05 5H607 AA04 BB01 BB09 BB14 CC01 CC03 DD03 DD08 DD09 EE58 FF01 GG01 GG01 GG01 GG01 GG01 GG01 GG01 GG01 GG01 GG01 GG01 JK19

Claims (5)

[Claims] 1. A base plate, a sliding bearing unit held by the base plate, a rotating shaft rotatably supported by the sliding bearing unit, a stator provided on the base plate, and a stator provided on the rotating shaft, A rotor that rotates about the axis of the rotating shaft with respect to the base plate by magnetic action; and a locking piece that locks the rotor to stop the rotating shaft from slipping out of the bearing means. A motor formed integrally with a base plate. 2. The locking piece has a first piece connected to the base plate and a second piece connected to the first piece.
The first piece is disposed radially outward of the rotor,
The motor according to claim 1, wherein a piece is disposed at a position where the rotor can lock the rotor. 3. The rotor has a permanent magnet, is made of a magnetic material, and is provided in a region in a circumferential direction around an axis of a rotating shaft so as to face a movement path of the permanent magnet. A rotor guide piece that changes the magnetic force acting in the direction in the circumferential direction, wherein the locking piece punches out the remaining area except for the one area in the circumferential direction of the part facing the moving path of the permanent magnet of the base plate material. The said rotor guide piece is formed in the shape of an arc in the circumferential direction one area | region of the part which faces the moving path of the permanent magnet of the raw material of a base plate by punching out the said locking piece, The characterized by the above-mentioned. The motor according to 1. 4. A base plate, sliding bearing means held by the base plate, a rotating shaft rotatably supported by the sliding bearing means, a coil, a stator provided on the base plate, and a permanent magnet, A rotor provided on the rotating shaft and rotating around the axis of the rotating shaft with respect to the base plate by magnetic action between the stator and the rotor; A rotor guide piece provided facing the movement path of the magnet and changing a magnetic force acting on the permanent magnet in the axial direction in the circumferential direction, wherein the rotor guide piece is formed integrally with the base plate. Motor to do. 5. A base plate, sliding bearing means held by the base plate, a rotary shaft rotatably supported by the sliding bearing means, a coil, a stator provided on the base plate, and a permanent magnet. A rotor provided on the rotating shaft and rotating around the axis of the rotating shaft with respect to the base plate by magnetic action between the stator and the rotor; A rotor guide piece provided facing the moving path of the magnet and changing the magnetic force acting on the permanent magnet in the axial direction in the circumferential direction, and locking the rotor to stop the rotating shaft from slipping out of the bearing means. The rotor guide piece and the lock piece are integrally formed on the base plate at positions substantially symmetrical with respect to the axis of the rotating shaft. Motor according to symptoms.