JPH06113518A - Rotor hub machining unit - Google Patents

Abstract

PURPOSE:To enhance accuracy in finish work by allowing machining on the entire peripheral face of a rotor hub including the top face thereof. CONSTITUTION:The rotor hub machining unit performs cutting on a covered cylindrical hub supported rotatably on a fixed shaft through bearings with a recording disc being loaded on the outer periphery thereof. A motor shaft 2 has one end supported coaxially with a fixed shaft 5 by a supporting part 6 provided at the tip thereof and the other end supported by a center shaft 17 movable in the axial direction, and an axial sliding body 9 is provided on the outer periphery of the fixed shaft 5. A rotary body 12 is provided rotatably on the outer periphery of the sliding body 9. A press body 13 provided with a rubber member 14 is secured to the bottom end face of the rotor hub 3 which is then rotated through the press body 13 upon rotation of the rotary body 12 thus moving a tool and cutting the peripheral face of the rotor hub 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor hub processing apparatus suitable for a spindle motor mainly used for rotating a disk (magnetic disk, optical disk) or the like.

[0002]

2. Description of the Related Art Generally, in a spindle motor, a shaft is fixed to a bracket mounted on a disk drive,
A cylindrical rotor hub with a lid is rotatably supported on the outer circumference of the shaft through a pair of bearings, a rotor magnet is mounted on the rotor hub, and a stator fixed to the shaft is arranged facing the rotor magnet. There is.

A disk is fixed to the outer periphery of the rotor hub, and information is read and written by a magnetic head while the disk is rotated at high speed together with the rotor hub.

By the way, in the spindle motor as described above, along with the recent miniaturization and increase in capacity, strict dimensional control of each component and smooth rotation of the rotor hub are required.

For this reason, after the motor is assembled, it is inspected whether or not the required specifications are satisfied, and if the specifications such as the assembly height and the rotational runout are not satisfied, the rotor hub is subjected to cutting, so-called finishing. Is done.

Conventionally, when this finishing process is performed, for example, a processing device as shown in FIG. 3 is used.

In FIG. 3, at the center of the apparatus main body A,
A workpiece mounting chuck B is provided, and this chuck B
In addition, as shown in FIG. 4, one end of the shaft D of the spindle motor C is clamped. A rotation drive unit H is connected to a drive shaft F of a front drive device E provided in the front portion of the device main body A via a speed reduction mechanism G.

This rotary drive unit H, as shown in FIG.
A helical coupling J for correcting misalignment, which is fixed to the reduction shaft I of the reduction mechanism G, a coupling member K coupled to the helical coupling J, and a cylindrical pressing body L supported by the coupling member K, A support pin M that is rotatably supported inside the pressing body L and has a tip protruding and retracting from the rear surface of the pressing body L, a spring N that elastically biases the supporting pin M rearward, and an annular shape that is mounted on the rear surface of the pressing body L. And the rubber member O.

Then, the tip of the support pin M is engaged with the other end of the shaft D of the spindle motor C according to the bias of the spring N, and the spindle motor C is held horizontally, and the cylindrical rotor hub with the lid of the spindle motor C is held. The rubber member O of the pressing body L is in contact with the tip end surface of P, that is, the motor top surface.

Therefore, when the speed reducing shaft I is rotated by the front drive unit E via the speed reducing mechanism G, the pressing body rotates together with the coupling J and the connecting member K, and the rotor hub P of the spindle motor C contacting the rubber member O. Rotates.

In this rotating state, the cutting tool Q is moved as shown by the arrow in FIG. 4 to cut the peripheral surface of the rotor hub P.

[0012]

However, in the above-described conventional processing apparatus, the pressing body L is brought into contact with the top surface of the rotor hub P in order to apply the processing rotational force to the rotor hub P. There is a problem that the tool bit Q does not enter the surface, making it impossible to process the top surface.

Moreover, since the spindle motor C is supported by sandwiching the other end of the shaft D by the chuck B, it becomes so-called cantilever support, and misalignment is likely to occur, resulting in a problem in finishing accuracy.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to allow the peripheral surface including the top surface of the rotor hub to be processed, and to finish it. It is to provide a processing device for a rotor hub that can improve accuracy.

[0015]

In order to achieve the above object, in a rotor hub processing apparatus of the present invention, a fixed shaft supported by a base and a shaft formed at the tip of the fixed shaft and coaxial with the fixed shaft. A support portion that supports one end of the arranged shaft from the one end side thereof, and is provided coaxially with the fixed shaft at the tip end side so as to be movable in the axial direction and supports the other end of the shaft from the other end side. A movable shaft, a sliding body movably supported on the outer periphery of a fixed shaft in the axial direction, a rotating body rotatably provided on the outer periphery of the sliding body, and a supporting body side fixed to the supporting body side of the rotating body. A pressing body having a rubber member that contacts the bottom end surface of the rotor hub on its surface, a biasing unit that elastically biases the sliding body toward the support body, and a drive mechanism that rotates the rotating body. , Rotate the rotor hub through the pressing body, and Move the door is obtained as cutting a peripheral surface of the rotor hub.

[0016]

In the rotor hub processing apparatus having the above-described structure, the pressing body is elastically contacted to the end face of the bottom of the rotor hub supported by the shaft by the biasing means through the rubber member to operate the drive mechanism. When the rotating body is rotated, the rotor hub rotates together with the rotating body via the pressing body, and the cutting of the rotor hub by the cutting tool becomes possible.

In this case, since the surface on the other end side of the rotor hub, that is, the motor top surface is completely opened, it is possible to machine the entire peripheral surface of the rotor hub including the motor top surface.

Further, since the shaft of the motor is supported from both ends thereof, there is no misalignment or the like as compared with the conventional cantilever support, and the finishing precision can be improved.

[0019]

EXAMPLES Examples will be described with reference to FIGS. 1 and 2. FIG. 1 shows the entire configuration of a rotor hub processing apparatus of the present invention, and FIG. 2 shows a part of it in an enlarged manner.

The spindle motor 1 has a fixed shaft 2
The rotor hub 3 having a cylindrical shape with a lid is rotatably supported via a bearing, the rotor magnet is fixed to the inner peripheral surface of the rotor hub 3, and the stator is fixed to the shaft facing the rotor magnet. A recording disc is mounted on.

A hollow fixed shaft 5 is attached orthogonally to the base 4 of the processing apparatus, and a small diameter step portion at one end (base side) of the shaft 2 is fitted to the tip of the fixed shaft 5. A support portion 6 that supports this is formed.

An electromagnetic coil 7 is attached to the base of the fixed shaft 5 and the fixed shaft 5 is energized by energizing the electromagnetic coil 7.
A ferromagnetic sliding body 9 supported axially movably in the central portion of the bearing via a thrust bearing 8 can be sucked and moved to the base side. As shown in FIG. 2, the sliding body 9 is normally urged to move toward the tip side by the coil spring 10.

A rotating body 12 is rotatably provided outside the sliding body 9 via a radial bearing 11, and a pressing body 13 is fixed to the tip end side of the rotating body 12. The tip of the pressing body 13 has a small diameter, a rubber member 14 is attached to the end surface thereof, and the rubber member 14 of the pressing body 13 is elastically contacted with the bottom end surface of the rotor hub 3 according to the bias of the coil spring 10. .

Reference numeral 15 is a slide guide shaft provided in the processing apparatus in parallel with the fixed shaft 5, and 16 is a front support unit movably supported by the guide shaft 15, which is coaxial with the fixed shaft 5 at the tip end side thereof. A center shaft 17 arranged is provided, and the unit 16 is moved to the base side of the fixed shaft 5 along the guide shaft 15, and the tip tapered portion of the center shaft 17 is inserted into the other end center hole of the shaft 2. The shaft 2 is supported by the center from both ends.

Reference numeral 18 is a bearing stand of the processing apparatus, and 19 is a bearing stand 1.
8 is a relay shaft that is rotatably supported by 8 and is parallel to the fixed shaft. Pulleys 20 and 21 are axially attached to both ends, and one pulley 20 and the rotating body 12 are interposed via a belt (not shown). It is connected.

Reference numeral 22 denotes a processing machine main shaft which is rotated by an electric motor (not shown). A main pulley 23 is fixed to the shaft end, and the main pulley 23 and the pulley 21 are connected via a belt (not shown). .

In the processing apparatus having the above-described structure, one end of the shaft 2 of the spindle motor 1 is fixed to the fixed shaft 5 while the sliding body 8 is sucked and moved to the base side of the fixed shaft 5 by energizing the electromagnetic coil 7. The front support unit 1
6 is moved to the base side and the tip of the center shaft 17 is inserted into the other end of the shaft 2 to support the shaft 2.

When the electromagnetic coil 7 is de-energized,
The sliding body 9 moves toward the tip side according to the bias of the coil spring 10, the rotating body 12 and the pressing body 13 also move, and the rubber member 14
Elastically contacts the bottom end surface of the rotor hub 3.

When the electric motor is driven in this state, the rotational force of the processing machine main shaft 22 is transmitted to the rotating body 22 via the relay shaft 19, and the pressing body 13 rotates together with the rotation of the rotating body 22, and the rubber member 14 passes. Rotor hub 3 rotates.

Therefore, the rotor hub 3 is set by a cutting tool (not shown).
The peripheral surface of the rotor hub 3 can be cut, and at this time, the surface on the tip side of the rotor hub 3, that is, the top surface is not blocked, so that the cutting work of the top surface can be performed.

As a result, by using the processing apparatus of the above-described embodiment, the entire circumference of the rotor hub 3 can be cut and the shaft 2 can be supported by the center at both ends, and the finishing accuracy can be greatly improved. 3 enables smooth and highly accurate rotation, which enables stable reading and writing of the disk.

The present invention is not limited to the above-mentioned embodiment, and it is obvious that the present invention can be modified within the scope of the present invention.

[0033]

Since the present invention is configured as described above, it has the following effects. Since the rotating mechanism is arranged on the bottom side of the rotor hub supported by the shaft and the rotating force is applied to the rotor hub from its bottom end surface, a cutting tool can be put on the top surface of the rotor hub, The entire peripheral surface including the top surface can be easily cut.

In addition, since the shaft rotatably supporting the rotor hub is center-supported from both ends thereof, the shaft is not misaligned and the finishing accuracy can be greatly improved.

[Brief description of drawings]

FIG. 1 is a cut front view showing an embodiment of a rotor hub processing apparatus according to the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a front view showing a conventional rotor hub processing apparatus.

FIG. 4 is a partial cutaway front view showing a time of processing in the processing apparatus of FIG.

[Explanation of symbols]

 1 Spindle Motor 2 Shaft 3 Rotor Hub 4 Base 5 Fixed Shaft 6 Supporting Part 9 Sliding Body 10 Coil Spring 12 Rotating Body 13 Pushing Body 14 Rubber Member 17 Center Shaft 19 Relay Shaft 22 Machining Machine Spindle

Claims (1)

[Claims] 1. A processing apparatus for a rotor hub, which cuts a cylindrical rotor hub with a lid, which is rotatably supported by a fixed shaft via a bearing and has a recording disk mounted on the outer periphery thereof, comprising a fixed shaft supported by a base. A support portion formed at the tip of the fixed shaft and supporting one end of the shaft coaxially arranged with the fixed shaft from the one end side; and a shaft arranged coaxially with the fixed shaft at the tip side of the fixed shaft. A movable shaft that is movably provided in a predetermined direction and that supports the other end of the shaft from the other end side, a sliding body that is axially movably supported on the outer circumference of the fixed shaft, and an outer circumference of the sliding body. A rotatable body that is rotatably provided; a pressing body that is fixed to the support body side of the rotary body and that has a rubber member that abuts the bottom end surface of the rotor hub on the support body side surface; Bounce toward the body An urging means and a drive mechanism for rotating the rotating body, wherein the rotor hub is rotated by the rotation of the rotating body via the pressing body, and the cutting tool is moved to cut the peripheral surface of the rotor hub. A processing device for a rotor hub, which is characterized by: