JPH0386049A - Motor - Google Patents

Abstract

PURPOSE:To enable practically sufficient galvanization at the inside of a screw hole by making a screw hole through a housing member, performing galvanization and then sealing the through hole with sealant. CONSTITUTION:A screw hole is bored in the protruding section 21A of the rotary hub 21 for a motor 20 from the upper end face 21B thereof to a predetermined depth. A through hole 21E, communicated with the screw hole 21C and reaches to the lower face 21D, is made through the rotary hub 21 while a groove section 21F, communicated with the through hole 21E, is made in the lower end face 21D of the rotary hub 21 and then a hold ring 24 is fitted in the groove section 21F. Since the through bole 21E communicated with the screw bole 21C is bored and the hold ring 24 is mounted in the groove section 21F after the rotary hub 21 is subjected to galvanization, the inside of the screw hole 21C can be subjected to practically sufficient galvanization and a foreign matter can be prevented from being scattered from the inside of the motor 20 through the screw hole 21C to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a motor, and is suitable for application to, for example, a motor configured to rotate a magnetic disk.

B. Summary of the Invention The present invention provides a motor in which a screw hole for attaching parts is drilled in a casing, after forming the screw hole so as to pass through the casing and plating the casing. By sealing the screw hole with the sealing member, the inside of the screw hole can be practically sufficiently plated, and the motor can have a sealed structure.

C. Prior Art Conventionally, for example, a motor designed to rotationally drive a magnetic disk drives a magnetic disk drive by fixing the magnetic disk directly on a casing configured to rotate with respect to a fixed iron core. Some devices have been designed to be smaller and thinner.

That is, as shown in FIG. 4, the motor 1 has a fixing shaft 3 planted in two upper surfaces of the concave portion of a flange-shaped fixing member 2, and a fixing shaft 3 with an iron core 5 provided in the center. The fixing shaft 3 is engaged with the hole 5A and fixed onto the fixing member 2.

Further, the rotating hub 6 forming the housing of the motor 1 has an engaging hole 6
By engaging the inner circumferential surface 7A of the bearing 7 fitted in A with the fixed shaft 3, the bearing 7 is rotatably engaged with the fixed shaft 3.

Further, the rotary hub 6 has spacers 8A and 8B inserted into the outer circumferential surface of a protrusion 6B protruding from the upper surface thereof to fit the first and second magnetic disks IOA and IOB, and the fixed disk 12. The magnetic disks IOA and IOB are fixed by screwing them to the upper surface 6C of the protrusion 6B with screws 9.

Further, a skirt portion 6D is provided on the lower surface of the rotating hub 6 and protrudes downward along the outer periphery, and an annular magnet 13 is fixed to the inner peripheral surface of the skirt portion.

Therefore, by attaching the rotating hub 6 to a position where the iron core 5 faces the annular magnet 13, the annular magnet and the iron core form a magnetic circuit, and by conducting a driving current to the iron core, the rotating hub 6 is rotationally driven. , thereby rotationally driving the magnetic disks IOA and 10B.

D Problems to be Solved by the Invention By the way, in a magnetic disk device in which a magnetic disk is rotationally driven by the motor, for example, 0. A magnetic head is suspended with a gap of several [μ-] to read or write information from a magnetic disk plate rotating at high speed.

Therefore, even if extremely fine dust adheres to the magnetic disk plate, the dust collides with the magnetic head, making it impossible to read or write information accurately.

Therefore, the motor that rotationally drives the magnetic disk has a sealed structure that prevents foreign matter such as bearing grease from scattering from the inside of the motor to the outside of the motor.
As shown in FIG. 5, a screw hole 6E for screwing a magnetic disk is drilled from the upper surface 6C to a predetermined depth without penetrating from the upper surface 6C of the protrusion 6B to the lower surface 6F. As a result, the rotary motor as a housing has a sealed structure to prevent foreign matter from scattering from inside the motor to the outside.

However, the rotating hub 6 is formed by plating, for example, nickel on the surface of a ferrous metal material such as free-cutting steel, and in the plating process, it is difficult to uniformly apply the plating liquid to the inside of the screw hole 6E that does not penetrate. This is difficult, and there is a problem in that the inside of the screw hole 6E cannot be sufficiently rust-proofed in practice.

In addition, the plating liquid that has adhered to the inside of the screw hole 6E cannot be completely removed even during the plating liquid removal process, and as a result, the plating liquid may scatter outside from the screw hole when the magnetic disk is inserted (after the magnetic disk is installed). There was a problem in that the particles adhered to the surface of the magnetic disk.

The present invention has been made in consideration of the above points, and has a sealing structure capable of plating the inside of a screw hole sufficiently for practical purposes and preventing foreign matter such as plating liquid from remaining inside the screw hole. The purpose of this paper is to propose a new motor.

E Means for Solving Problems In order to solve these problems, the present invention provides a screw hole 21C in the housing member 21, and a predetermined component 10A, an IOB, and a screw hole 21C in the screw hole 21C. 12 is attached to the motor 20, which is configured to be screwed, and a screw hole 21C formed to penetrate the housing member 21, and a seal configured to seal the screw hole 21C of the penetrating structure. member 24.

By drilling the through-structure screw hole 21C in the casing member 21 of the F-action motor 20 and plating the casing, the inside of the screw hole can be sufficiently plated for practical purposes. After applying, the motor 20 can be made into a sealed structure by sealing the screw hole 21C with the sealing member 24.

G example An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, in which parts corresponding to those in FIGS. 4 and 5 are given the same reference numerals, a motor 20 for driving the rotation of the magnetic disk
A screw hole 21C for fixing the magnetic disk is drilled in the protrusion 21A of the rotary knob 21 from the upper surface 21B to a predetermined depth, and the screw 9 is tightened into the screw hole 21C via the fixing disk 12. By making the magnetic disks IOA and I
The OB is fixed to a rotating hub 21.

Further, as shown in FIG. 2, the rotating hub 21 has a screw hole 21
A through hole 21E is formed which communicates with C and penetrates the lower surface 21D, and a groove portion 21F having a planar annular shape is formed in the lower surface 21D of the rotary hub 21 and communicates with the through hole 21E. As shown in FIG. 3, a hold ring 24 made of an annular plate is fitted into the groove 21F.

This hold ring 24 is shaped into an annular shape by sheet metal pressing, and is fixed in the groove 21F with, for example, an ultraviolet curing adhesive.

Therefore, by fixing the hold ring 24 in the groove 21F, the penetrated screw hole 21C can be sealed.
D side) is sealed from the outside.

In the above configuration, the rotating hub 21 is in the state 1 before the hold ring 24 is attached to the groove 21F! (FIG. 2), plating processing is performed.

In this way, the screw hole 2IC is penetrated from the upper side surface 21B to the lower side surface 21D by the side of the through hole 21, so that the plating liquid can sufficiently flow into the inside of the screw hole 21C.

Therefore, the screw hole 21G can be plated sufficiently for practical purposes, and the screw hole 21G can also be plated in the plating solution removal process.
It is possible to prevent the plating liquid from remaining inside the 1C.

Next, by attaching the hold ring 24 to the groove 21F of the rotary hub 21 which has been plated, the screw hole 21
C can be sealed.

Therefore, when the rotating hub 21 is attached to the fixed shaft 3 to configure the motor 20, foreign substances such as bearing grease may be removed from the rotating hub 2.
A sealing structure that does not scatter from the inside of 1 to the outside is constructed.

According to the above configuration, the through hole 2 is connected to the screw hole 21C.
1E and attaching the hold ring 24 to the groove 21F after plating the rotary hub 21, the inside of the screw hole 21C can be plated sufficiently for practical use, and the motor 20 can be Foreign matter generated from inside can be prevented from scattering to the outside through the screw hole 21C.

Thus, the magnetic disk IO fixed on the rotating hub 21
It is possible to prevent foreign matter from adhering to the surfaces of A and IOB.

Incidentally, by making the screw hole 21C a penetrating structure, it is possible to sufficiently discharge the chips when forming the screw hole 21C during the manufacturing process, and the plating liquid can also be sufficiently discharged. After installing the disc, screw hole 21
It is possible to prevent chips, plating liquid, etc. from scattering from C.

In the above-mentioned embodiment, a case was described in which an adhesive was used to fit the hold ring 24 into the groove 21F, but the present invention is not limited to this, and the present invention is not limited to this. It's okay.

Furthermore, in the above-mentioned embodiment, the groove portion 21F is formed to
Although we have described the case where the hold ring 24 is fitted,
The present invention is not limited to this, and the hold ring 24 may be directly bonded to the lower surface 21D of the rotating hub 21 without providing the groove portion 21F.

Further, in the above-described embodiment, a case was described in which the hold ring 24 was used as a method for sealing the screw hole 2IC, but the present invention is not limited to this.
The threaded hole 21C may be sealed by similarly forming a tap on the other side of the through-hole 21 communicating with the rotary hub 21 and tightening a screw from the lower surface 21D of the rotating hub 21 to the through-hole 21E. The same effects as in the above case can be obtained.

Further, in the above-described embodiment, the present invention was applied to a motor configured to rotate a housing (rotary hub 21), but the present invention is not limited to this, and the present invention is not limited to this. It can be applied to motors whose shafts and/or iron cores rotate.

Furthermore, in the above-mentioned embodiments, a case was described in which the present invention was applied to a motor for driving rotation of a magnetic disk.
The present invention is not limited to this, and can be widely applied to screw holes provided in the housings of various other motors.

H Effects of the Invention As described above, according to the present invention, when plating the inside of a screw hole provided in a motor housing member, the screw hole is passed through the housing member for plating. By subsequently sealing the through hole with a sealing member, it is possible to realize a motor with a sealed structure in which the inside of the screw hole can be plated to a sufficient extent for practical use.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of a motor according to the present invention;
FIG. 2 is a sectional view showing the configuration of the rotating hub, FIG. 3 is a perspective view for explaining the sealing of the rotating hub, FIG. 4 is a perspective view showing the overall configuration of the motor for a magnetic disk drive, and FIG. The figure is a sectional view for explaining the problem. 120...Motor, 2...Fixing member,
3... Fixed shaft, 6.21... Rotating hub, 6E, 2IC... Screw hole, IOA, IOB.
...Magnetic disk, 21E...Through hole,
21F...Groove, 24...Hold ring.

Claims (1)

[Scope of Claims] A motor in which a screw hole is formed in a housing member, and a predetermined component is screwed into the screw hole, the screw hole being formed to pass through the housing member; and a sealing member configured to seal the screw hole of the penetrating structure.