JPS63103639A - Rotary unit - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application 1 This invention relates to a rotating unit used for video cheap recorders, dinotal audio table recorders, compact discs, floppy discs, and the like.

[Prior Art] Conventionally, as shown in Fig. 11 and Fig. 2 of Japanese Patent Application Laid-Open No. 60-159417, a bearing member is constructed by a sleeve and a lid-shaped slus F receiver attached to the upper end surface of the sleeve with bolts. vt has been completed. The cylindrical hole provided in the bearing member has a thrust bearing surface and a cylindrical radial bearing surface, and the sleeve body provided in the cylindrical hole faces the thrust surface facing the thrust bearing surface and the radial bearing surface. It has a radial surface. A groove for generating dynamic pressure for the radial bearing is provided on the radial surface, and a groove for generating dynamic pressure for the thrust bearing is provided on the thrust bearing surface.

A rotor support member is attached to the lower surface of the bearing member, and a rotor magnet is attached to the lower surface of the rotor support member. A stator support member is attached to the lower part of the outer peripheral surface of the shaft body, and a stator coil attached to a printed circuit board is attached to this stator support member. The cheater coil faces the rotor magnet in the axial direction, and a rotating drum as a rotating member is attached to the upper surface of the bearing member.

[Problems to be Solved by the Invention] Both the radial bearing clearance and the thrust bearing clearance between the bearing member and the shaft attract dust such as dirt and foreign matter.

Figure 1 and fjS2 of JP-A-60-159417
For various reasons, the rotating drum is not shown in the figure, but it is assumed that after the entire device is assembled, the lid-shaped thrust receiver will be attached to the upper end of the sleeve with bolts, so when installing the thrust receiver to the sleeve, the sill- ing −
9. Cleanliness of the entire facility is required. In addition, when the rotor support member is molded by press working between one metal mold and the other mold, the contact surface of the rotor support member to the rotor magnet is molded in contact with one of the molds, Further, the contact surface of the rotor support member to the bearing member is molded in contact with the other mold. In this case, since one mold is somewhat inclined with respect to the other mold, the contact surface of the rotor support member to the rotor magnet and the contact surface of the rotor support member to the bearing member are not parallel, and the rotor support member Since the rotor magnet attached to the rotor has poor alignment with the axis of the bearing member, a motor with the desired performance cannot be obtained.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotating unit in which the number of parts that require cleanliness during bearing assembly can be reduced and the motor performance is good.

Measures for Solving Problem E] The cylindrical hole provided in the lees receiving member has a thrust bearing surface and a cylindrical radial bearing surface, and the shaft body provided in the cylindrical hole has a thrust bearing surface. It has an opposing thrust surface and a radial surface that faces the radial bearing surface. A groove for generating dynamic pressure is provided in at least one of the radial bearing surface and the radial surface, and a rotor support member is attached to at least one of the upper surface and the outer peripheral surface of the bearing member, and the rotor support member has an inner surface. A rotor whose peripheral surface has a larger diameter than the bearing member is provided. A printer 1 board whose inner circumferential surface has a larger diameter than the bearing member and a stator whose inner circumferential surface has a larger diameter than the bearing member are respectively attached to the stator support member attached to the lower part of the outer circumferential surface of the shaft, and this stator is connected to the rotor. They are axially opposed. Then, the rotation member is attached to the bearing member.

[Operation] When the bearing member rotates using the rotor and stator as the drive mechanism, the pressure of the lubricant in the radial bearing clearance between the radial bearing surfaces increases due to the pumping action of the grooves for generating dynamic pressure, and the radial The bearing surface rotates without contacting the radial surface.

The assembly order of the rotating unit is to first apply lubricant to the radial bearing surface and thrust bearing surface of the bearing member, if necessary, and then insert the shaft body into the cylindrical hole of the bearing member. Then, the stator support member is attached to the shaft body, and then the stator attached to the printed circuit board is attached to the stator support member from above. Then, the rotor support member to which the rotor is attached is attached to the bearing member from above, and then the rotating member is attached to the bearing member.

[Example] Next, embodiments of the present invention will be explained based on the drawings.

FIG. A cylindrical hole 7 provided in a heavy industrial bearing member 1 consisting of a planar thrust bearing surface 9 and a cylindrical radial bearing surface 1 provided at two locations spaced apart in the axial direction.
1, and the thrust bearing surface 9 is provided with a groove 13 for generating dynamic pressure for a spiral thrust bearing, as shown in FIG. The cylindrical hole 7 has a large diameter hole 15 larger in diameter than the radial bearing surface 11 between the two radial bearing surfaces 11, and this large diameter hole 15 has a larger diameter than the radial bearing surface 11.
It communicates with the outside of the bearing member 1 through a lower air vent hole 17 provided in the bearing member 1 . The bottom of the cylindrical hole 7 is connected to the outside of the bearing member 1 by a groove-shaped upper air vent hole 19 provided in the upper part of the inner peripheral surface of the sleeve 3 in the axial direction. The installed shaft body 21 has a thrust bearing surface 9
A planar thrust surface 23 and a radial bearing surface 1 facing each other
The two radial surfaces 25 are each provided with grooves 27 for generating dynamic pressure for a herringbone-shaped radial bearing.

The thrust bearing clearance between the thrust bearing surface 9 and the thrust surface 23 and the radial bearing surface 11 and the radial surface 25
Lubricants such as oil, grease, and air are present in the radial bearing clearance between the two.

A cylindrical rotating-side rotary transformer 31 is attached to a step provided at the lower part of the outer peripheral surface of the bearing member 1, and the shaft body 2
An annular stator support member 35 is attached to the lower part of the outer peripheral surface of the stator 1 by a shrink fit. A circumferential groove 51 is provided on the upper surface of the stator support member 35, and this circumferential groove 51
A fixed-side rotary transformer 33 whose inner peripheral surface has a larger diameter than the bearing member 1 is attached to the rotary transformer 33 .

The fixed-side rotary transformer 33 is located on the outer periphery of the rotating-side rotary transformer 31, and the inner peripheral surface of the stator support member 35 has a larger diameter than the bearing member 1. A printed circuit board 37 and a stator 39, which is disposed on the printed circuit board 37 and whose inner peripheral surface has a larger diameter than the bearing member 1 and a larger diameter than the stationary rotary transformer 33, are respectively attached. In the embodiment shown in the outer circumferential surface of No. 1, a rotor support member 41 is attached to the outer circumferential surface with bolts, and the inner circumferential surface has a larger diameter than the bearing member 1 and has a fixed side attached to the outer circumference of the lower surface of the rotor support member 41. An annular extender 43 having a flame diameter is attached to the rotary transformer 33.
3 faces the stator 39 in the axial direction, and a rotating drum as a rotating member 45 is attached to the upper surface of the bearing member 1.

When the bearing member 1 rotates with the above configuration, the thrust bearing surface 9 rotates without contacting the thrust surface 23 due to the pumping action of the groove 13 for generating dynamic pressure for the thrust bearing, and the dynamic pressure for the radial bearing also rotates without contacting the thrust surface 23. The radial bearing surface 11 becomes the radial surface 25 due to the pumping action of the generation groove 27.
rotates without contact.

The order of assembly of this rotating unit is to first attach the sleeve 3 to the cylindrical roller 5 by shrink fitting, and then apply lubricant if necessary to the radial bearing surface 11 and thrust bearing surface 9 of the bearing member. . Then the cylindrical hole 7 of the bearing member
The shaft body 21 is inserted, and then the rotation side rotary transformer 31 is attached to the bearing member 1. Then, the stator support member 35 is attached to the shaft body 21 by shrink fitting, and then the fixed side rotary transformer 33 and the stator 39 attached to the printed circuit board 37 are attached to the stator support member 35 from above, respectively.

Then, after attaching the rotor support member 41 to which the rotor 43 is attached to the bearing member 1, the rotating member 45 is attached to the bearing member 1.
Install.

In this rotating unit, the gap between the bearing member 1 and the shaft body 21, the clearance between the shear bearing and the thrust bearing are all designed to prevent dust such as dirt and foreign matter. It is not preferable to remove the shaft 21 from the bearing member 1 after the shaft 21 has been inserted into the bearing member 7 while ensuring the necessary cleanliness, as this will lead to the intrusion of dust into the radial bearing clearance and the thrust bearing clearance. In addition, there is no need to remove the shaft 21 from the bearing member 1 when assembling the rotating unit. Furthermore, although the stator support member 35 is at a certain high temperature when shrink-fitting, the lubricant inside the radial bearing can withstand the heat to a certain extent. The support member 35 does not adversely affect the lubricant in the radial bearing clearance. Further, the rotating side rotary transformer 31, the stationary side rotary transformer 33, and the printed circuit board 37 all contain synthetic resin, but since the stator supporting member 35 is provided with a circumferential groove 51, they do not rotate with the stator supporting member 35. IIl! The distance from the rotary transformer 31 is wide, and the heat of the stator support village 35 during shrink fitting is not transmitted to the rotary transformer 31 on the rotating side. Furthermore, since the fixed side rotary transformer 33 and the printed circuit board 37 are respectively attached to the stator support member 35 after the stator support member 35 reaches room temperature, the stator support member 35 is
The heat is transmitted to the fixed side rotary transformer 33 and the printed circuit board 3.
L' for 7! do not. Therefore, the rotating side rotary transformer 3
1. Fixed side rotary transformer 33 and printed circuit board 37
Neither of them will be damaged by the heat of the stator support member 35 during shrink fitting.

In addition, when the rotor support member 41 is formed between one mold and the other fully recovered mold by plastic working such as press working or forging, one mold is slightly inclined with respect to the other mold. . Therefore, both the rotor 43 and the contact surface of the bearing member 1 to the rotor support member 41 are connected to the rotor support member 41.
If the contact surface of the rotor support member 41 to the rotor 43 and the contact surface of the rotor support member 41 to the bearing member 1 are both molded in contact with one of the molds, the rotor The parallelism or perpendicularity between the contact surface of the support member 41 to the rotor 43 and the contact surface of the rotor support member 41 to the bearing member 1 is good.

Therefore, the perpendicularity of the rotor 43 to the bearing member 1 is good.

Furthermore, a groove 27 for generating dynamic pressure is provided on the radial surface 25.
This is due to the difference between the radial bearing surface 11 and the radial surface 2S (
A groove 2) for generating dynamic pressure, such as a spiral shape or a herringbone shape, may be provided on either side.

Both the radial bearing surface 11 and the radial surface 25 are not provided at two locations (they may be located at two locations).

Furthermore, at least one of the thrust bearing surface 9 and the thrust surface 23 may be provided with a groove 13 for generating dynamic pressure for the thrust bearing.

Note that the upper radial surface 25 and the upper radial bearing surface 11
A groove for generating dynamic pressure is provided on one side for both the spiral radial bearing and the thrust bearing, and a clearance larger than the thrust bearing clearance is provided between the outer periphery of the thrust bearing surface 9 and the outer periphery of the thrust surface 23. Furthermore, by providing a circulation hole in the center of the thrust surface 23 that communicates with the large diameter hole 15, when the thrust surface 23 is stationary, the annular contact surface around the circulation hole contacts the thrust bearing surface 9, but when rotating, the thrust surface 23 is in contact with the thrust bearing surface 9. The bearing surface 9 rotates while maintaining a small amount of flying height with respect to the thrust surface 23, and the radial bearing surface 11 rotates without contacting the radial surface 25.In this case, the thrust bearing surface 9 and the thrust surface 23 rotate. The rotor 43 may be attached to both of the thrust surfaces of the bearing member 1, and the rotor 43 whose upper top surface has a larger diameter than the bearing member 1 is attached, and the stator support member 35 has an inner circumferential surface which has a larger diameter than the bearing member 1. printed circuit board 3
7 and the stator 39 whose inner peripheral surface has a larger diameter than the bearing member 1, the shaft body 21 is inserted into the cylindrical hole 7 of the bearing member.
After inserting, the rotating unit can be assembled without removing the shaft body 21 from the cylindrical hole 7. Therefore, when inserting the shaft body 21 into the cylindrical hole 7, it is only necessary to ensure the cleanliness of the shaft body 21 and the bearing member 1, so the number of parts that require cleanliness can be reduced, and the cylindrical hole 7 of the sleeve body 21 Sufficient cleanliness can be ensured when inserting the bearing, and bearing assembly can be facilitated. Further, the shaft body 21 can be rotated without being removed from the cylindrical hole 7. Furthermore, since the contact surfaces of the rotor 43 and the bearing member 1 to the rotor support member 41 are both on the lower side or the inner peripheral side of the rotor support member 41, the rotor support member 41 is formed by plastic working such as press working or forging. When the contact surface of the rotor support member 41 to the rotor 43 and the bearing member 1 of the rotor support member 41
1.1 The contact surface is molded in contact with one of the molds, and the parallelism of the contact surface of the rotor support member 41 to the rotor 43 and the contact surface of the rotor support member 41 to the bearing member 1; Good perpendicularity. Therefore, since the rotor 43 has a good perpendicularity to the axis of the bearing member 1, it has the effect that the performance of the motor is good.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a rotating unit showing an embodiment of the present invention, and FIG. 2 is a plan view of the thrust bearing surface of FIG. 1. In the figure, 1 is a bearing member, 7 is a circular hole, 9 is a thrust bearing surface, 11 is a radial bearing surface, 21 is a shaft body, 23 is a thrust surface, 25 is a radial surface, and 27 is a groove for generating dynamic pressure. ,3
5 is a stator support member, 37 is a printed circuit board, 39 is a stator, 41 is a rotor support member, 43 is a rotor, and 45 is a rotating member.

Claims (1)

[Claims] 1. The cylindrical hole provided in the bearing member has a thrust bearing surface and a cylindrical radial bearing surface, and the shaft body provided in the cylindrical hole has a thrust bearing surface opposite to the thrust bearing surface. and a radial surface facing a radial bearing surface, the rotating unit having a groove for generating dynamic pressure in at least one of the radial bearing surface and the radial surface, the upper surface and the outer circumferential surface of the bearing member. A rotor support member is attached to at least one of the shafts, a rotor whose inner circumferential surface has a larger diameter than the bearing member is attached to the rotor support member, and a rotor whose inner circumference is attached to a stator support member attached to a lower part of the outer circumferential surface of the shaft body. A printed circuit board whose surface has a larger diameter than the bearing member and a stator whose inner peripheral surface has a larger diameter than the bearing member are respectively attached, the stator faces the rotor in the axial direction, and a rotating member is attached to the bearing member. Rotating unit. 2. The rotating unit according to claim 1, wherein at least one of the thrust bearing surface and the thrust surface has a groove for generating dynamic pressure for the thrust bearing. 3. The rotating unit according to claim 1, wherein the stator support member is attached to the shaft body by shrink fitting.