JP2004040886A - Spindle motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spindle motor for rotating a disc in which sure anti-come-off effect is provided, while it is demounted with no destruction. <P>SOLUTION: A cylindrical stopper 5 is fitted to the outer peripheral part of a holder 4 and comprises a large diameter part at a part of the outer peripheral surface. An annular anti-come-off member 6 is fitted to the closed part of a rotor 2 and provided with a plurality of L-like claw parts 6a. A recessed part 5a is formed at the outer periphery of the large diameter part of the stopper 5 which has such groove shape as inclined downward in the rotational direction of the rotor 2, or as composed of coming-off direction and rotary direction orthogonal to each other. The claw 6a is inserted in the recessed part 5a to constitute an anti-come-off mechanism. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a spindle motor for rotationally driving a disk, and particularly has a feature in a retaining mechanism for preventing a rotating member from coming off.
[0002]
[Prior art]
Conventionally, as shown in Japanese Patent Application Laid-Open No. 2000-152550, a retaining mechanism of a spindle motor forms a locking part by bending a part of a rotor, and when the rotor tries to come off, the locking part is a bearing. A retaining mechanism is formed so that the stopper can be received by a stopper attached to the outer periphery of the holder. The following describes a conventional spindle motor retaining mechanism.
[0003]
FIG. 6 is a sectional view of a conventional spindle motor, and FIG. 7 is a plan view and a sectional view of the stopper of FIG. As shown in FIG. 6, 1 is a shaft, 2 is a rotor, and one end of the shaft is press-fitted and fixed to the rotor. Reference numeral 3 denotes a bearing, and 4 denotes a bearing holder for holding the bearing. The bearing 3 is press-fitted and fixed to the inner periphery of the holder 4.
[0004]
The inner peripheral portion of the rotor 2 has a step formed in a downward direction, and a ring-shaped stopper 5 having a plurality of claws as shown in FIG. When the rotor 2 tries to come off, the step 2A of the rotor 2 is caught by the claw 5A of the stopper 5, so that the rotor 2 does not come off.
[0005]
[Problems to be solved by the invention]
However, in the conventional configuration described above, since the stopper claw portion is deformed and inserted, once the step portion of the rotor is assembled with the claw portion of the stopper, it becomes difficult to remove the claw portion without destroying the claw portion, resulting in defective products. Was dismantled and could not be repaired.
[0006]
Further, since the stopper is formed of a soft elastic material such as a resin, the strength is low, and when a strong impact is applied from the outside, the claw portion of the stopper is broken and the rotor comes off. .
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a spindle motor that can be easily disassembled after assembling the motor and does not allow the rotor to come off.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, a spindle motor according to the present invention includes a cylindrical member having a large-diameter portion on a part of an outer peripheral surface attached to an outer peripheral portion of a bearing holder, and an L motor attached to a closing portion of a rotating member. A ring-shaped retaining member in which a plurality of U-shaped retaining portions are formed, and a shape inclined in a downward direction in the rotation direction of the rotor, or an irregular shape on the outer periphery of the large-diameter portion of the cylindrical member. And a retaining mechanism is formed by inserting the retaining portion into the concave portion.
Note that the cylindrical member may be eliminated, and a concave portion may be formed in the upper part of the outer periphery of the bearing holder instead.
[0008]
According to the present invention, a concave portion is formed on the outer periphery of the cylindrical stopper or the bearing holder, and the claw portion of the retaining member attached to the rotor side is inserted into the concave portion. Also, since the rotor is detachable, it is possible to provide a spindle motor that can be easily repaired and has a sufficient retaining effect.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
The spindle motor according to claim 1, wherein the spindle motor includes a rotating shaft, a bearing member for supporting the shaft, and a bearing holder for holding an outer peripheral portion of the bearing member. A cylindrical member having a large-diameter portion on a part of the outer peripheral surface attached to an outer peripheral portion of the bearing holder; and a plurality of L-shaped stoppers attached to a closing portion of a rotating member fixed to the upper end of the shaft. A ring-shaped retaining member having a portion formed therein, a concave portion is formed on the outer periphery of the large diameter portion of the cylindrical member, and the retaining portion is inserted into the concave portion to constitute a retaining mechanism. It is characterized by having done.
Next, a spindle motor according to a second aspect of the present invention is characterized in that the concave portion is formed in an upper part of the outer periphery of the bearing holder instead of the cylindrical member.
With this configuration, there is an operation that the spindle motor can be easily disassembled without breaking any members.
[0010]
Next, a spindle motor according to a third aspect of the present invention is characterized in that, in the spindle motor according to the first and second aspects, the shape of the concave portion is shaped so as to be inclined downward in the rotation direction. It is assumed that.
[0011]
With this configuration, even if the retaining portion of the retaining member of the rotor accidentally tries to enter the concave portion during rotation of the motor, the retaining portion is pushed downward, so that the rotor does not come out of the bearing holder.
[0012]
Next, in the spindle motor according to a fourth aspect of the present invention, in the spindle motor according to the first and second aspects, the shape of the recess is formed by a portion facing the axial direction and a sliding portion in the lateral direction. It is characterized by having been formed.
[0013]
With this configuration, there is an effect that the retaining effect can be further increased as compared with the spindle motor according to the third aspect.
[0014]
(Embodiment)
Hereinafter, an embodiment of the present invention described in claims 1 to 4 will be described with reference to FIGS. 1 to 5. FIG. 1 is a perspective view of a stopper member and a stopper according to Embodiment 1 of the present invention, and FIG. 2 is a sectional view of a spindle motor according to Embodiment 1 of the present invention. FIG. 3 is a perspective view of a bearing holder according to Embodiment 2 of the present invention, and FIG. 4 is a cross-sectional view of a spindle motor according to Embodiment 2 of the present invention. 5 (a) and 5 (b) are arrows A in FIGS. 1 and 3, respectively, and FIGS. 5 (c) and 5 (d) are FIGS. 5 (a) and 5 (b), respectively. It is a side view of a stopper or a bearing holder showing a modification. Components similar to those described in the conventional example are denoted by the same reference numerals.
[0015]
As shown in FIG. 1, the retaining member 6 is formed with two L-shaped claw portions 6a. The cylindrical stopper 5 has a large-diameter portion on a part of the outer peripheral surface thereof, and a concave portion 5a having a downward groove shape is provided on an outer peripheral portion of the large-diameter portion opposite to the claw portion 6a. Further, as shown in FIG. 2, the retaining member 6 is fixed to a closed portion inside the rotor 2, and the stopper 5 is attached to the bearing holder 4. Therefore, at the time of assembling, as shown in FIGS. 1 and 5A, the spindle motor is completed by inserting the claw 6a of the retaining member 6 into the recess 5a and attaching the rotor 2 to the stationary member.
[0016]
FIGS. 3, 4 and 5B show another embodiment of the present invention. Instead of the stopper 5, a recess 4a in the form of a one-sided groove is provided on the outer periphery of the bearing holder 4, and the claw portion 6a is inserted into the recess 4a, whereby the same retaining effect as that of the recess 5a can be obtained. The arrow B in FIG. 5 indicates the rotation direction of the rotor 2.
[0017]
As described above, since the recess 5a or 4a provided in the stopper 5 or the bearing holder 4 is formed to be inclined in a downward direction in the rotation direction, even if the claw portion 6a tries to enter the recess due to an external impact force or the like. , And cannot slide in the direction in which the rotor 2 comes out, so that a reliable retaining effect can be obtained. Note that the claw portion 6a and the concave portions 4a, 5a may be formed at two or more locations.
[0018]
Further, as shown in FIGS. 5 (c) and 5 (d), the recess 4a or 5a is prevented from slipping by forming the groove shape of the slipping direction and the sliding portion in the rotation direction orthogonal to each other. The effect can be enhanced.
[0019]
According to these configurations, a reliable retaining effect can be obtained, and a spindle motor that can be disassembled without destruction and can be removed from the stationary member by slowly rotating the rotor 2 in the reverse direction while lifting the rotor 2 is realized.
[0020]
【The invention's effect】
As described above, the concave portion is formed on the outer periphery of the cylindrical stopper or the bearing holder, and the claw portion of the retaining member attached to the rotor side is inserted into the concave portion. The spindle motor can be easily attached and detached, so that repair can be easily performed, and a spindle motor having a sufficient retaining effect can be provided.
[Brief description of the drawings]
FIG. 1 is a perspective view of a stopper member and a stopper according to Embodiment 1 of the present invention. FIG. 2 is a sectional view of a spindle motor according to Embodiment 1 of the present invention. FIG. 3 is a bearing according to Embodiment 2 of the present invention. FIG. 4 is a perspective view of a holder. FIG. 4 is a cross-sectional view of a spindle motor according to a second embodiment of the present invention. FIG. 5D shows a modification of FIG. 5A. FIG. 6B shows a modification of FIG. 5B. FIG. 6 is a sectional view of a conventional spindle motor. FIG. 7 is a plan view and a sectional view of a stopper of FIG. [Explanation of symbols]
Reference Signs List 1 shaft 2 rotor 2A step 3 bearing 4 bearing holder 4a recess (bearing holder)
5 Stopper 5A Claw (stopper)
5a recess (stopper)
6 Retaining member 6a Claw (retaining member)

Claims (4)

In a spindle motor having a rotating shaft, a bearing member for supporting the shaft, and a bearing holder for holding an outer peripheral portion of the bearing member, one of an outer peripheral surface attached to the outer peripheral portion of the bearing holder. A cylindrical member having a large-diameter portion in a portion, and a ring-shaped stopper member formed with a plurality of L-shaped stopper portions attached to a closing portion of a rotating member fixed to the upper end of the shaft. A spindle motor, comprising: a concave portion formed on the outer periphery of the large diameter portion of the cylindrical member; and a retaining mechanism configured by inserting the retaining portion into the concave portion. 2. The spindle motor according to claim 1, wherein the recess is formed in an upper part of the outer periphery of the bearing holder instead of the cylindrical member. 3. The spindle motor according to claim 1, wherein the shape of the concave portion is a shape inclined in a downward direction in a rotational direction. The spindle motor according to claim 1, wherein the shape of the concave portion is formed by a portion facing the axial direction and a sliding portion in a lateral direction.

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