JP3011516U - Hard disk drive actuator mounting structure - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide an actuator mounting structure for a hard disk drive, which can reduce the inertia in the rotational movement of the actuator to further reduce the time required for head movement. [Structure] Conventionally, the actuator is axially supported by covering a bearing mounted on a pivot shaft with a housing, and inserting the housing into a housing hole provided in the actuator. Therefore, the inertia is increased due to the size increase of the actuator due to the housing and the housing hole. In the present invention, the shaft support hole 71 having the belt-shaped convex portion 75 on the inner wall surface is formed in the actuator 70, and the bearings 73 and 74 are inserted in the shaft supporting hole 71 with the convex portion 75 interposed therebetween. , 74 directly attach the actuator 70. Since the actuator can be mounted directly on the bearing, the overall inertia of the actuator is reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hard disk drive, and more particularly, to a mounting structure for an actuator in the hard disk drive.

[0002]

[Prior art]

 A hard disk drive used as an auxiliary storage device for a computer or the like generally has a configuration shown in FIG. That is, it is provided with a spindle motor 50 that rotationally drives the hard disk 60 and an actuator 70 to which a magnetic head 61 is attached. The actuator 70 is rotatably supported by a pivot shaft 72, and has a head gimbal 63 having a head 61 mounted at its tip and a voice coil motor 66 mounted at its rear end. As a result, the actuator 70 is driven by the electromotive force of the voice coil motor 66, and the head 61 records / reads data to / from the hard disk 60.

The actuator 70 rotates about a pivot shaft 72 using a voice coil motor 66 as a drive source, and plays a role of accurately positioning the head 61 with respect to the disk 60. At this time, a rib 26 that abuts the stopper 30 is provided at the rear end of the actuator 70 so that the head 61 does not come off from the storage area of the disk 60. That is, the rib 26 is projected rearward from the molding portion 25 to which the voice coil 23 at the rear end of the actuator 70 is attached, and the rib 26 is brought into contact with the stopper 30 provided on the main body 40 to determine the drive range of the actuator 70. It has become. A buffer member 31 is attached to the stopper 30 in order to buffer the shock generated when the actuator 70 that is moving at a high speed comes into contact with the stopper 30. Accordingly, when the head 61 is moved toward the outside of the disk 60, the actuator 70 is restricted from moving further because the rib 26 contacts the stopper 30. On the contrary, when the head 61 is moved toward the inside of the disk 60, that is, when the head 61 is moved to the parking zone because the power is shut off or the storage / reading work is completed. The rib 26 comes into contact with the magnet 35 provided on the opposite side of the stopper 30 of the main body 40, so that the further movement is restricted and the rib is held at that position. Such an actuator 70 is attached as follows.

FIG. 5 shows a sectional view of an actuator 70 attached to a pivot shaft 72 in a conventional hard disk drive. It should be noted that "upper" and "lower" in the following description indicate the vertical relationship when the main body 40 is down and the actuator 70 is up.

A lower bearing 73 is attached to a pivot shaft 72 fixed to the main body 40, and a stainless steel housing 77 having a belt-shaped convex portion 76 formed at the center of the inner wall surface is attached to the lower surface of the convex portion 76 from above. The bearing 73 is covered so as to abut, and further, the upper bearing 74 is inserted until it abuts on the upper side surface of the convex portion 76, and the bearing and the housing are assembled to the pivot shaft 72. Then, a housing 77 is fitted in a housing hole 70a provided in the actuator 70 to fix the actuator 70, and the actuator 70 is pivotally supported by bearings 74 and 73 about a pivot shaft 72.

As described above, since the stainless steel housing 77 is inevitably used to pivotally support the actuator 70 on the pivot shaft 72, a factor that causes a large inertia in the rotational movement. It has become. Further, since the housing 77 is used, the size of the housing hole 70a of the actuator 70 must be increased, and therefore the overall size of the actuator 70 is increased, so that the inertia of the entire actuator is increased. In other words, the inertia associated with the head movement during recording / reading is large, which affects the time required for head movement.

[0007]

[Problems to be solved by the device]

 Therefore, an object of the present invention is to provide an actuator mounting structure that can reduce the inertia in the rotational movement of the actuator and further reduce the time required to move the head.

[0008]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention enables the actuator to be directly mounted on the bearing mounted on the pivot shaft, thereby reducing the overall inertia.

That is, in the actuator mounting structure in which the actuator is rotatably supported by the two bearings mounted on the pivot shaft, the shaft support hole having the belt-shaped convex portion on the inner wall surface is formed in the actuator. It is characterized in that the actuator is directly attached to the bearing so that the bearing is formed and the bearing is inserted into the shaft support hole while sandwiching the convex portion. Alternatively, the bearing is assembled to the pivot shaft with a cylindrical support ring sandwiched between them, and the actuator is provided with a shaft support hole having substantially the same diameter as the bearing, and the actuator is directly attached to the bearing. . Further, in the case of using this support ring, it is characterized in that a groove is formed on the facing surface of the bearing, and a ridge that is inserted into the groove is formed on the corresponding surface of the support ring.

[0010]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, "upper" and "lower" indicate the vertical relationship when the hard disk drive body is down and the actuator is up. The overall structure of the hard disk drive of this embodiment is similar to that shown in FIG.

FIG. 1 shows a first embodiment of an actuator mounting structure according to the present invention in a sectional view corresponding to FIG. The actuator 70 of this example has a shaft support hole 71 whose inner diameter is substantially the same as the outer diameter of the bearings 73 and 74, and a belt-shaped convex portion 75 is provided at the center of the inner wall surface of the shaft support hole 71. Has been. Therefore, the mounting structure is such that the actuator 70 is covered over the lower bearing 73 attached to the pivot shaft 72 so that the bearing 73 and the lower surface of the convex portion 75 are in contact with each other, and then the upper portion of the convex portion 75 is covered. The upper bearing 74 is inserted and assembled until it comes into contact with the side surface. That is, it is a structure in which the bearings 73 and 74 are inserted into the shaft support hole 71 with the convex portion 75 interposed therebetween. The attached actuator 70 can be rotated with respect to the pivot shaft 72 by bearings 73 and 74.

As described above, since the actuator 70 can be directly attached to the bearings 73 and 74, the housing can be eliminated, the inertia is reduced, and the size of the shaft support hole 71 can be reduced accordingly. Therefore, the inertia of the entire actuator 70 is also reduced. Therefore, it is possible to reduce the time required to move the head 60.

FIG. 2 shows a second embodiment in a sectional view corresponding to FIG. In the mounting structure of this example, a cylindrical support ring 78 is interposed between a lower bearing 73 and an upper bearing 74 that are assembled to the pivot shaft 72. In this case, the actuator 70 is fixed to the outer surface of the bearings 73 and 74. That is, the lower bearing 73 is mounted on the pivot shaft 72 fixed to the main body 40, the support ring 78 is installed thereon, and the upper bearing 74 is mounted on the pivot shaft 72. Then, the bearings 73 and 74 are fitted and inserted into the shaft support holes 71 of the actuator 70 which have substantially the same diameter as the bearings 73 and 74, and the actuator 70 is fixed to the outer side surfaces of the bearings 73 and 74, and the pivot shaft 72 is used as the shaft. In addition, the bearings 73 and 74 are adapted to be rotatable.

The second embodiment can achieve the same inertia suppression as that of the first embodiment, and accordingly, the time required for the movement of the head 60 can be reduced. In addition, the support ring 78 interposed between the outer rings of the bearings 73 and 74, which are ball bearings, not only sets the distance between the bearings 73 and 74, but also preloads the bearings 73 and 74 in advance. It also has a role of suppressing the displacement of the bearings 73 and 74 against shock or vibration due to the stopper 30 or the like. That is, especially in the ball bearing that supports the actuator of this example, it is better to apply a preload against the load during assembly in order to form a proper contact state between the ball, the inner ring, and the outer ring during operation. Therefore, there is an advantage that the maximum strength of the bearing can be obtained and a smoother rotating operation can be obtained.

FIG. 3 shows a third embodiment in a sectional view corresponding to FIG. The mounting structure of the third embodiment is a modification of the second embodiment. That is, ridges 79 and 80 are formed on the inside of the upper and lower side surfaces of the support ring 78, respectively, and further, a ridge 73a for receiving the ridge 80 is formed on the upper side surface of the lower bearing 73. This is a structure in which a concave streak portion 74a for receiving the convex streak portion 79 is formed on the lower side surface portion of the upper bearing 74. As described above, by engaging the concave ridges 73a and 74a provided on the inner side of the outer rings of the bearings 73 and 74 using the ball bearings with the convex ridges 80 of the support ring 78, it is possible to suppress rattling and The function of the ring 78 can be further enhanced, and a smoother rotating operation can be obtained.

[0016]

[Effect of device]

 As described above, according to the mounting structure of the present invention, since the actuator can be directly fixed to the bearing assembled to the pivot shaft, it is possible to reduce the overall inertia of the actuator during the rotating operation. Therefore, the time required to move the head can be reduced. As a result, the operating speed of the hard disk drive is improved, which greatly contributes to the operating speed of hardware such as computers and word processors.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing a first embodiment of an actuator mounting structure according to the present invention.

FIG. 2 is a sectional view of a main part showing a second embodiment of the actuator mounting structure according to the present invention.

FIG. 3 is a sectional view of an essential part showing a third embodiment of the actuator mounting structure according to the present invention.

FIG. 4 is a schematic configuration diagram of a hard disk drive.

FIG. 5 is a sectional view of an essential part showing a conventional actuator mounting structure.

[Explanation of symbols]

 70 Actuator 71 Shaft Support Hole 72 Pivot Shaft 73, 74 Bearing 73a, 74a Recessed Stroke 78 Support Ring 79, 80 Relief

Claims (3)

[Scope of utility model registration request] 1. An actuator mounting structure for a hard disk drive, wherein an actuator is rotatably supported by two bearings mounted on a pivot shaft, and a shaft supporting hole having a belt-shaped convex portion on an inner wall surface. The actuator mounting structure is characterized in that the actuator is directly attached to the bearing by inserting the bearing into the shaft supporting hole with the convex portion sandwiched therebetween. 2. An actuator mounting structure for a hard disk drive, wherein an actuator is rotatably supported by two bearings mounted on a pivot shaft, and the bearing is pivoted with a cylindrical support ring interposed therebetween. An actuator mounting structure characterized in that the actuator is directly mounted on the bearing by mounting the shaft on the shaft and providing the actuator with a shaft support hole having substantially the same diameter as the bearing. 3. The actuator mounting structure according to claim 2, wherein recessed ridges are formed on the facing surface of the bearing, and ridges inserted into these recessed ridges are formed on the corresponding surface of the support ring.