JPH0631357U - Disk drive motor - Google Patents

Abstract

(57) [Abstract] [Purpose] Always prevents the spindle from slipping out toward the one end side regardless of the posture of the motor. [Structure] One end side of a spindle is fixed to a rotor set R having a hub base 9, and the other end side of this spindle is fitted into bearings 6 and 7 arranged in a housing 3 to which a stator set S is fixed for rotation. The motor is a freely supported motor, and stopper means 21, 22, 2 for preventing the rotor set R from slipping out toward one end of the spindle 20 are included in the motor.
4 are provided. [Effect] The stopper can prevent the spindle of the rotor set from coming out of the bearing even if vibration or impact is applied to the motor in a state of overturning or inversion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disk drive motor in which a magnetic disk or the like is placed on a hub base and rotationally driven.

[0002]

[Prior art]

 FIG. 4 shows a disk drive motor previously proposed by the applicant. The stator set S in which the drive coil 1 is wound around a plurality of salient poles formed on the stator core 2 is the inner peripheral portion of the stator core 2. Is fitted on the outer periphery of the central cylindrical portion of the housing 3 and placed on the upper surface of the collar portion 3a. A substrate 4 made of a magnetic material such as an iron plate is provided on the lower surface of the flange 3a of the housing 3. The substrate 4 is screwed and fixed to the stator core 2 with a screw 5 through a through hole 3b formed in the flange 3a, whereby the substrate 4 and the stator set S are integrally formed in the housing 3. Further, an oil-impregnated metal bearing 6 is fitted in the center hole of the central cylindrical portion of the housing 3, and an outer ring of a ball bearing 7 is fixed in the upper part.

These bearings 6 and 7 are arranged side by side in the axial direction, and a spindle 8 is rotatably supported by the cooperation of both. A hub base 9 for mounting and rotating a magnetic disk (not shown) such as a floppy disk is fitted to one end of the spindle 8 and a rotor case 10 formed in a substantially dish shape is fixed to the hub base 9. Has been done. Further, a ring-shaped drive magnet 11 magnetized in the radial direction is arranged by adhesion or the like on the inner surface on the outer peripheral side of the rotor case 10 to form a rotor set R. The drive magnet 11 is opposed to the outer peripheral surface of the stator core 2 at a predetermined interval.

In the motor having such a configuration, the center of the drive magnet 11 in the axial direction is slightly offset from the center of the stator core 2. With this configuration, the attractive force acts in the direction in which the drive magnet 11 coincides with the center of the stator core 2. As a result, even if the spindle 8 is still inserted in the ball bearing 7 and the oil-impregnated metal bearing 6, the rotor set R does not move upward in the figure in the normal state, and the rotor set R does not move upward at the predetermined axial position. It's spinning.

[0005]

[Problems to be solved by the device]

 Since the disk drive motor has been made thinner in recent years, for example, a floppy disk drive device in which the motor is installed is also installed in a notebook computer that can be carried from a stationary computer. . On the other hand, in the case of the notebook type, the posture may be overturned or inverted when being carried. When vibration or impact is applied to the motor in this state, the rotor set R is disengaged, and there is a problem that the motor cannot rotate thereafter.

The present invention has been made to solve such a problem, and provides a disk drive motor capable of always preventing the spindle from coming out toward one end side regardless of the posture of the motor. The purpose is to

[0007]

[Means for Solving the Problems]

 According to the present invention, one end side of a spindle is fixed to a rotor set having a hub base, and the other end side of the spindle is rotatably supported by being inserted into a bearing arranged in a housing to which the stator set is fixed. The drive motor is provided with a stopper means for preventing the rotor assembly from slipping out toward one end side of the spindle.

[0008]

[Action]

 If the motor is provided with stopper means for preventing the rotor set from slipping out toward the one end side of the spindle, even if the motor is vibrated or shocked by the stopper in the horizontal or reverse posture, the spindle of the rotor set Is prevented from coming out of the bearing.

[0009]

[Embodiment] An embodiment of a disk drive motor according to the present invention will be described below with reference to the drawings. The same reference numerals as those in FIG. 4 indicate the same parts, and detailed description thereof will be omitted. The feature of the embodiment in FIG. 1 is that a screw hole 20a is formed in the axial direction from the lower end of the spindle 20 of the rotor set R, and a screw 21 as a stopper means is screwed into the screw hole 20a, and the head of the screw 21 is screwed. The collar portion 21a provided on the upper surface of the housing 3 faces the lower surface of the housing 3.

That is, as described above, the spindle 20 is pulled out from the bearings 6 and 7 against the attractive force between the drive magnet 11 and the stator core 2 due to external vibrations and impacts when the posture is not shown. In such a case, the collar portion 21a of the screw 21 comes into contact with the lower surface of the housing 3, and in this state, it is prevented from coming out. In this embodiment, if the collar portion 21a of the screw 21 is brought into contact with the nearby oil-impregnated metal bearing 6, the bearing 6 may be damaged at the time of contact. It is essential that the housing 3 is brought into contact with the housing 3.

FIG. 2 shows another embodiment of the present invention, and the feature of the embodiment in FIG. 2 is that the front end portion 22a of the stopper guide 22 is exposed on the outer upper surface of the rotor case 10 of the rotor set R. is there. That is, the stopper guide 22 is bent in a crank shape as shown in FIG. 2, and the base end portion 22b is attached to the substrate 4 by the screw 23. Then, the tip end portion 22a of the stopper guide 22 is made to face the outer upper surface of the rotor case 10 with a predetermined gap. With this configuration, when the rotor assembly R including the rotor case 10 is about to come out due to external vibration or shock of the motor, the tip 22a of the stopper guide 22 comes into contact with the rotor case 10, and in this state. It is possible to prevent spillage.

FIG. 3 shows a further embodiment of the present invention. The feature of the embodiment in FIG. 3 is that a spindle stopper 24 in which the outer periphery of the lower end of the spindle 20 is expanded outward is formed as a unit. The outer diameter of the spindle stopper 24 is larger than the inner diameter of the oil-impregnated metal bearing 6. In order to provide the spindle stopper 24, it is possible to easily form the hollow portion 25 in the axial direction by making a hole in the lower end of the spindle 20 and then expanding the surrounding jetty portion outward by a predetermined jig. . Then, as in the case of the above-mentioned example, when the rotor set R is about to come out due to the vibration or shock of the motor from the outside, the spindle stopper 24 comes into contact with the inner peripheral corner portion of the oil-impregnated metal bearing 6, and in this state. You can prevent you from getting out. In this example, since the number of parts does not increase, the structure can be relatively inexpensive.

Although three examples of the stopper means have been described above, it is desirable to apply one of the stopper means individually, avoiding using two or more of them together.

It should be noted that the above-described embodiment is merely an example, and as the stopper means, in short, when the rotor set R attempts to be displaced in the axial direction due to vibration or impact, the displacement can be prevented. In that case, other configurations may be applied, for example, a stopper plate may be fixed to the lower end of the spindle 20 by means such as welding or caulking, and various modifications can be made without departing from the present invention. .

[0015]

[Effect of device]

 As is clear from the above description, in the disk drive motor of the present invention, the rotor set is provided with the stopper means for preventing the rotor set from slipping out toward the one end side of the motor. It is possible to prevent the spindle of the rotor set from slipping out of the bearing even if vibration or impact is applied to the motor in the state of overturning or reversing.

[0016]

[Brief description of drawings]

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

FIG. 2 is a sectional view of an essential part showing another embodiment of the disk drive motor.

FIG. 3 is a cross-sectional view of an essential part showing still another embodiment of the disk drive motor.

FIG. 4 is a sectional view showing a conventional disk drive motor.

[Explanation of symbols]

 1 Drive Coil 2 Stator Core 3 Housing S Stator Set 6 Oil-impregnated Metal Bearing 7 Ball Bearing 9 Hub Base 10 Rotor Case 11 Drive Magnet R Rotor Set 20 Spindle 21 Screw (Stopper Means) 22 Stopper Guide 23 Spindle Stopper

Claims (1)

[Scope of utility model registration request] 1. A disk rotatably supported by fixing one end side of a spindle to a rotor set having a hub base, and inserting the other end side of the spindle into a bearing arranged in a housing to which the stator set is fixed. A disk drive motor, wherein the motor is provided with stopper means for preventing the rotor set from slipping out toward one end of the spindle.