JP5869795B2 - Spindle motor - Google Patents

Description

  The present invention relates to a spindle motor characterized by a structure in which an alignment ring is fixed to a rotor frame.

  As personal computers and their external storage devices, those using various disk storage media such as CD-ROMs are known. The disk storage medium rotates in a state where it is mounted on the disk drive device, and at that time, data writing and data reading are performed. The disk drive device includes a rotor frame that is driven by a motor and rotates, and an alignment ring, and the disk storage medium is driven by a disk by fitting an opening provided in the center of the disk storage medium into the alignment ring. The structure is fixed to the rotor frame of the apparatus. The alignment ring is an important member for holding the disk storage medium and needs to be firmly fixed to the rotor frame. In general, the alignment ring is fixed to the rotor frame by a structure in which light press-fitting to the shaft and fixing with an adhesive are used in combination. Further, a structure described in Patent Document 1 has been proposed as a structure for fixing the alignment ring to the rotor frame more firmly. In the technique described in Patent Document 1, a back yoke that presses the alignment ring against the rotor frame is prepared separately, and the alignment ring is prevented from being detached from the rotor frame by an engagement portion provided on the back yoke.

JP 2011-34612 A

  By the way, in a notebook personal computer or the like, the disk drive device is also required to be thin and light. In this respect, the structure using the back yoke described in Patent Document 1 is disadvantageous in terms of reduction in thickness and weight, and also in terms of cost because the number of parts increases. In such a background, an object of the present invention is to provide a spindle motor having a structure in which an alignment ring is firmly fixed to a rotor frame without using a separate member.

According to the first aspect of the present invention, there is provided a rotating shaft, a rotor frame that rotates together with the rotating shaft and provided with a plurality of holes, and an adjustment for holding a disk storage medium that is fixed to the rotor frame. A core ring, a housing that holds the shaft in a rotatable state, and a flange portion provided in the housing, and the centering ring is provided with a plurality of engaging portions on a bottom surface thereof, The plurality of engaging portions of the alignment ring include a substantially L-shaped portion in which a shape of a cross section viewed from a direction toward the axial center includes a tip portion extending in a circumferential direction, and the substantially L-shaped portion. Is engaged with the edges of the plurality of hole portions in the circumferential direction, and the rotor frame rises in the axial direction from the edges of the plurality of hole portions, and its tip is bent in the direction of the center of the shaft. Multiple claws of structure Provided that the plurality of claw portions are engaged in a non-contact state to the flange portion, a spindle motor, characterized in that fall out of the rotor frame is prevented.

  According to a second aspect of the present invention, in the first aspect of the invention, the plurality of engaging portions have a shape that is caught in the circumferential direction by the plurality of hole portions of the rotor frame. To do. According to the second aspect of the present invention, the engaging portion provided on the alignment ring is caught in the hole of the rotor frame in the circumferential direction so that the alignment ring cannot be pulled out from the rotor frame in the axial direction. Is obtained.

  According to the present invention, there is provided a spindle motor having a structure in which an alignment ring is firmly fixed to a rotor frame without using a separate member.

It is a sectional side view of the spindle motor of an embodiment. They are a side view (A), a perspective view (B), a perspective view (C), and a rear view (D) of the rotor frame. It is a side view (A), a perspective view (B), and a perspective view (C) of the alignment ring. They are a side view (A), a perspective view (B), a perspective view (C), and a rear view (D) showing a state in which the alignment ring is fixed to the rotor frame.

(Constitution)
A spindle motor 100 is shown in FIG. The spindle motor 100 is used in a disk drive device for rotating an optical disk such as a CD (Compact Disc), a DVD (Digital Versatile Disc), or a Blu-ray. Of course, the application of the spindle motor 100 is not limited to this. The spindle motor 100 includes a shaft 101 serving as a rotation shaft. The shaft 101 is held by a bearing 102 in a rotatable state on a plate 106. The bearing 102 is a sliding bearing, a sliding member 104 having a substantially cylindrical shape fixed to the outer periphery of the shaft 101, a housing 105 having a substantially cylindrical shape that holds the sliding member 104, and a thrust plate that supports the bottom surface of the shaft 101. 103. The plate 106 is a member on the stator side, and the housing 105 and the thrust plate 103 are fixed to the plate 106. By fixing the plate 106 to the mating member, the spindle motor 100 is secured to the mating member. As the bearing 102, a fluid dynamic pressure bearing or a rolling bearing can be used.

  A rotor frame 107 obtained by pressing a metal plate is attached to the upper portion of the shaft 101. FIG. 2 shows the rotor frame 107. As shown in FIG. 2, the rotor frame 107 includes a cylindrical portion 108 having a short axial length and a disk portion 109 having a shape that covers one opening of the cylindrical portion 108. A shaft accommodating portion 110 that accommodates the shaft 101 is provided at the central portion of the disc portion 109. An end portion of the shaft 101 is fixed inside the shaft housing portion 110 by press-fitting, bonding, or the like, and the rotor frame 107 and the shaft 101 are coupled.

  A claw portion 112 is provided around the center portion of the disc portion 109. Five claw portions 112 are arranged at equiangular positions when viewed from the axial direction (in this case, five at every 72 ° angular position). The claw portion 112 is formed by cutting out a part of the disc portion 109 and bending the portion inward. And the rectangular hole 111 is provided using the part of the hole formed in this notched and bent part. The hole portions 111 are provided at five equiangular positions as viewed from the axial direction, like the claw portions 112. The claw portion 112 has a substantially U-shaped cross-sectional structure. As shown in FIG. 1, the claw portion 112 is engaged with a flange portion 105 a provided on the upper portion of the housing 105 of the bearing 102 in a non-contact state, so that the rotor frame 107 is prevented from coming off from the housing 105. The structure is obtained.

  In the state of FIG. 1, a rotor magnet 113 composed of a permanent magnet is fixed inside the cylindrical portion 108 of the rotor frame 107. The rotor magnet 113 is magnetized at an equiangular angular position as viewed from the axial direction. This is the same as in the case of a normal spindle motor.

  A core holder 115 is fixed to the plate 106, and a stator core 116 is fixed to the core holder 115. The stator core 116 is configured by stacking silicon steel plates, and a stator coil 117 is wound around the stator core 116. The shape of the stator core 116, the number of the stator coils 117, and the arrangement state thereof are the same as those of a normal spindle motor. The outer portion of the stator core 116 is disposed to face the rotor magnet 113. Magnetic attraction acting between the stator-side electromagnet constituted by the stator core 116 and the stator coil 117 and the rotor magnet 113 by switching the direction of the drive current supplied to the plurality of stator coils 117 at an appropriate timing. The force and the magnetic repulsive force are switched at a specific timing, and the rotor frame 107 rotates.

  As shown in FIG. 1, an alignment ring 120 is fixed on the rotor frame 107. FIG. 3 shows the alignment ring 120. The alignment ring 120 is made of a resin material and includes a substantially disc-shaped bottom 121 and a fitting portion 122. The disc storage medium is held on the alignment ring 120 by fitting the fitting portion 122 into the hole in the center of the disc storage medium having a donut shape. This is the same as in the case of a normal disk drive device. A cylindrical portion 123 rising in the axial direction is provided at the center portion of the bottom portion 121, and the shaft accommodating portion 110 of the rotor frame 107 is fitted inside the cylindrical portion 123 (see FIG. 1).

  As shown in FIG. 3, five hooks 124 are provided on the back side of the bottom 121 at equiangular positions in the circumferential direction as viewed from the axial direction (in this case, angular positions every 72 °). The hook 124 is an example of a hook portion, and has a substantially L shape when viewed from the viewpoint toward the axial center. The five hooks 124 are formed at positions corresponding to the holes 111 provided in the rotor frame 107 and have a structure that can be hooked and engaged with the holes 111. In this engaged state, the alignment ring 120 is pressed against the rotor frame 107, each of the five hooks 124 is inserted into each of the five holes 111, and the alignment ring 122 is rotated from that state to It is obtained by making the part 124a and the disk part 109 of the rotor frame 107 overlap. In this state, a structure is obtained in which the hook 124 is caught in the hole 111 and the alignment ring 120 is not pulled out from the rotor frame 107 in the axial direction.

  This state is shown in FIG. Here, the height dimension of the gap formed between the hook tip part 124 a and the bottom part 121 is slightly smaller than the thickness dimension of the disc part 109. With this structure, when the alignment ring 122 is rotated to engage the hook 124 and the hole 111, the hook tip portion 124a contacts the hook contact portion 109a and press-fits to sandwich the hook contact portion 109a. 124 engages with the hole 111 without rattling, and the alignment ring 120 is not pulled out from the rotor frame 107 in the axial direction.

(Assembly method)
First, the bearing 102 and the core holder 115 are fixed to the plate 106, and the stator core 116 around which the stator coil 117 is wound is fixed to the core holder 115.

  Next, the rotor frame 107 to which the rotor magnet 113 is attached is prepared. At this stage, unlike the state shown in FIG. 2, the claw portion 112 of the rotor frame 107 has not been bent yet. Then, the shaft 101 is attached to the shaft accommodating portion 110 of the rotor frame 107. Next, the shaft 101 is attached to the bearing 102 fixed to the plate 106, and the claw portion 112 is bent downward as shown in FIG. 1 to engage with the flange portion 105 a of the housing 105. At this time, the claw portion 112 and the flange portion 105a overlap each other when viewed from the axial direction, but are not in contact with each other. Thus, a structure for preventing the rotor frame 107 from falling off by the claw portion 112 and the flange portion 105a is obtained.

  Next, the shaft housing portion 110 of the rotor frame 107 is covered with the cylindrical portion 123 of the alignment ring 120 so that the alignment ring 120 is in close contact with the rotor frame 107. At this time, the hook 124 of the alignment ring 120 is inserted into the hole 111 (see FIG. 4) of the rotor frame 107, and then the alignment ring 120 is rotated to obtain the engaged state shown in FIG. When engaging, a stronger engagement can be realized by applying an adhesive to the shaft housing portion 110 and the cylindrical portion 123. Thus, the spindle motor 100 shown in FIG. 1 is assembled.

(Superiority)
According to the structure described above, the alignment ring 120 is mechanically fixed to the rotor frame 107 by the hook 124 of the alignment ring 120 instead of only the adhesive. For this reason, a margin for the alignment ring 120 to be detached from the rotor frame 107 is increased, the fixation can be made more reliably, and a structure in which the alignment ring 120 is difficult to loosen due to vibration or the like is obtained. Further, the rotor frame 107 is already provided with a hole 111 (see FIG. 2) obtained by forming a claw 112 for preventing the rotor from coming off, and the hook 124 is engaged with the hole 111. Therefore, it is not necessary to separately provide a portion with which the hook 124 is engaged. This is advantageous in terms of reduction of processing man-hours, reduction of parts, and simplification of the structure, and furthermore, since the structure is simple, the positional accuracy of the alignment ring 120 after assembly can be increased.

(Other)
As a structure for attaching the alignment ring 120 to the rotor frame 107, in addition to adopting a shape having a substantially L-shaped hook portion such as the illustrated hook 124, the cross-sectional shape is a triangular shape with a convex tip. When the rotor frame 107 is pushed into the hole 111, the two corners that contact the bottom of the triangle are deformed and pushed into the hole 111, and the two corners are caught by the hook contact portion 109 a of the hole 111. Thus, it is possible to employ a structure that prevents the axial drawing. The triangular shape may be an arrowhead shape (half of the triangular shape).

  In the present embodiment, the hook 124 and the hole 111 are described as five, but the present invention is not limited to this. For example, the number of the hooks 124 and the holes 111 may be three or three. The portion 111 may be formed by five pieces, and the hooks 124 may be formed by three pieces. These numbers can be freely selected according to the attachment strength of the alignment ring, the ease of manufacturing each component, the strength of each component itself, the size of the motor, and the like.

  The aspect of the present invention is not limited to the individual embodiments described above, and includes various modifications that can be conceived by those skilled in the art, and the effects of the present invention are not limited to the contents described above. That is, various additions, modifications, and partial deletions can be made without departing from the concept and spirit of the present invention derived from the contents defined in the claims and equivalents thereof.

  The present invention can be used in a spindle motor used in a disk drive device that drives a disk storage medium.

  DESCRIPTION OF SYMBOLS 100 ... Spindle motor, 101 ... Shaft, 102 ... Bearing, 103 ... Thrust board, 104 ... Sliding member, 105 ... Housing, 106 ... Plate, 107 ... Rotor frame, 108 ... Cylindrical part, 109 ... Disc part, 109a ... Hook contact part, 110 ... shaft housing part, 111 ... hole part, 112 ... claw part, 113 ... rotor magnet, 115 ... core holder, 116 ... stator core, 117 ... stator coil, 120 ... alignment ring, 121 ... bottom part, 122 ... Fitting portion, 123... Cylindrical portion, 124... Hook, 124 a.

Claims (2)

A rotating shaft,
A rotor frame that rotates with the rotating shaft and is provided with a plurality of holes;
An alignment ring fixed to the rotor frame for holding a disk storage medium;
A housing for holding the shaft in a rotatable state;
A flange portion provided on the housing,
The centering ring is provided with a plurality of engaging portions on the bottom surface thereof,
The plurality of engaging portions of the alignment ring include a substantially L-shaped portion in which a shape of a cross section viewed from a direction toward the axis center extends in a circumferential direction at a tip portion,
The substantially L-shaped portion is engaged with an edge of the plurality of holes in the circumferential direction,
The rotor frame is provided with a plurality of claw portions having a structure that rises in an axial direction from edges of the plurality of hole portions, and further has its tip bent in the direction of the axial center,
A spindle motor characterized in that the plurality of claw portions engage with the flange portion in a non-contact state to prevent the rotor frame from falling off.   2. The spindle motor according to claim 1, wherein the plurality of engaging portions have a shape that is caught in the circumferential direction in the plurality of hole portions of the rotor frame.

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