JPS6331440A - Revolving shaft supporter - Google Patents

Abstract

PURPOSE:To position a revolving shaft radially and prevent certainly the revolving shaft from falling, by providing a recess on an inner peripheral face of a bearing housing and by pressing a bearing against said recess. CONSTITUTION:A revolving shaft 1 is supported by a cylindrical bearing housing 14 via a pair of bearings 2, 3 and a stator 5 is fitted to a lower end outer periphery of said bearing housing 14. A coilshaped spring 6 performing a biasing action axially is inserted between respective outer ring end faces of the bearings 2, 3 and two flat springs 17 performing a biasing action radially are inserted at an appropriate angle from each other circumferentially between the outer periphery of one bearing 2 and the bearing housing 14. A recess 14a having an appropriate width larger in axial dimensions than a width of the bearing 2 is provided on an inner peripheral face of the bearing housing 14 on which a resultant vector force by the springs 17 acts via the bearing 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a support device that can support a rotating shaft of a micromotor for driving a hard disk drive or the like while preventing it from falling.

[Prior art and its problems]

A conventional example of a rotating shaft support device will be explained based on FIG. This figure shows the main parts of a vertical shaft motor, in which a rotating shaft 1 is supported by a cylindrical bearing housing 4 via a pair of bearings 2 and 8, and a cylindrical shaft is fixed to the outer periphery of the upper end of the bearing/'t housing 4. Child 5 is fitted.

The bearing housing 4 is lightweight and made of aluminum or the like having a low specific gravity, and the bearings 2 and 8 are loosely fitted into the bearing nozzle 1 housing 4. In the bearings 2 and 3, a coiled spring 6 is suitably compressed and inserted between the respective outer ring end faces to press in the rolling direction in order to eliminate the gap between the rolling parts and improve the rotation accuracy. . In addition, when the bearings 2 and 8 become high temperature 1 due to the heat generated due to the rotation of the rotation 411B1, the bearing 2
, 3 and the bearing housing 4 may increase the clearance between them, causing the bearings 2 and 3 to become stiff. To prevent this, the outer periphery of the bearing 2 and the bearing/S housing A leaf spring 7 is inserted between the two ends 4 and 4 to exert a pressing action in the radial direction. In the case of a micromotor for driving a node λ-head disk, this spring 7 is arranged so that the suppressing direction is in the Q-vertical direction, which is orthogonal to the magnetic head direction indicated by the P arrow, as shown in FIG. is fixedly attached to the lower end of the wheel support nousing 4 with a screw 8. A rotor center 9 is fixed to the lower end of the rotating shaft 1, and a rotor 10 made of a permanent magnet or the like is attached to the outer periphery of the rotor center 9, surrounding the stator 5.

In such a structure, since the bearing 2 is only pressed at one point from the direction perpendicular to the direction of the magnetic head, it is difficult to reliably prevent the rotation 11M1 from falling in the direction of the magnetic head. There is a drawback that if the device falls in the direction, malfunctions may occur during writing and reading of records.

[Purpose of the invention]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, it is an object of the present invention to provide a rotating shaft support device that can reliably support the rotating shaft while preventing it from collapsing.

[Key points of the invention]

In order to achieve the above-mentioned object, the present invention has two springs that apply pressure in the radial direction between the outer periphery of one of a pair of bearings that support a rotating shaft and the cylindrical bearing housing that supports this. Insert it at an appropriate angle in the circumferential direction,
A recess with an appropriate width, the axial dimension of which is larger than the width of the bearing, is provided on the inner peripheral surface of the bearing housing on which the vector resultant force of the two springs acts via the bearing.

[Embodiments of the invention]

FIG. 1 shows an embodiment of the present invention, and the same parts as in FIGS. 3 and 4 are designated by the same reference numerals. This figure shows a vertical shaft motor, in which a rotating shaft 1 is supported by a cylindrical bearing housing 14 made of aluminum or the like through a pair of bearings 2 and 3, and a stator 5 is attached to the outer periphery of the upper end of the bearing housing 14. is fitted. A coiled spring 6 that presses in the axial direction is inserted between the outer ring end surfaces of the bearings 2 and 3, and the outer circumference of one of the bearings 2 and the bearing housing 1
Two leaf springs 17 which exert a pressing action in the radial direction are inserted between the two leaf springs 17 at appropriate angles in the circumferential direction. These two springs 17 are arranged so that the pressing direction by the vector resultant force is in the Q upward direction which is perpendicular to the magnetic head direction indicated by the P arrow as shown in FIG. 2 in the case of a micromotor for driving a hard disk. The end portion is sandwiched between the outer periphery of the upper end portion of the bearing housing 14 and the stator 5, and is fixedly attached. A recess 14a having an appropriate width and an axial dimension larger than the width of the bearing 2 is provided on the inner circumferential surface of the bearing housing 14 on which the vector resultant force acts via the bearing 2.

According to the embodiment described above, by appropriately pressing the bearing 2 into the recess 14a of the bearing housing 14, the bearing 2 and the rotating shaft 1 can be reliably positioned in the radial direction by engaging with the side edges of the recess 14&. Therefore, the force of the spring 17 can prevent the rotating shaft 1 from falling in the direction of the magnetic head.

Although the above embodiment describes the case of a vertical shaft motor, the present invention is not limited to this.

〔Effect of the invention〕

According to this invention, in a support device for a rotating shaft, two springs that exert a pressing action in the radial direction are arranged between the outer periphery of one of a pair of bearings that support the rotating shaft and the cylindrical bearing housing that supports this. Insert at an appropriate angle in the circumferential direction,
A recess with an appropriate width, the axial dimension of which is larger than the width of the bearing, is provided on the inner peripheral surface of the bearing housing, where the vector resultant force of the two springs acts through the bearing, so that the bearing can be pressed into the recess. This provides the effect that the rotating shaft can be positioned in the radial direction and that the rotating shaft can be reliably prevented from falling due to the component force of the spring.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an embodiment of the present invention, Fig. 2 is an explanatory diagram of the action of the spring in Fig. 1, Fig. 3 is a longitudinal sectional view of a conventional example, and Fig. 4 is a longitudinal sectional view of an embodiment of the present invention.
The figure is an explanatory view of the action of the spring in FIG. 3. DESCRIPTION OF SYMBOLS 1... Rotating shaft, 2, 3... Bearing, 14... Bearing housing, 14a... Recess, 17... Spring.

Claims (1)

[Claims] 1) In a support device that supports a rotating shaft with a cylindrical bearing housing via a pair of bearings, two springs that apply pressure in the radial direction between the outer periphery of one of the bearings and the bearing housing are properly spaced in the circumferential direction. A recess of an appropriate width, the axial dimension of which is larger than the width of the bearing, is provided on the inner peripheral surface of the bearing housing on which the vector resultant force of the two springs acts through the bearing. A rotating shaft support device characterized by: