JP2593689Y2 - Disc clamp device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk clamp device, and more particularly to a disk clamp device having a collet for clamping a magnetic disk supported on a bearing.

[0002]

2. Description of the Related Art In general, electronic information processing apparatuses such as personal computers and word processors are provided with a magnetic disk drive as an external information storage device. As shown in FIG.
And a collet 2 for crimping and holding a magnetic disk rotatably mounted at its tip via a bearing on a motor-side rotary clamp. Conventionally, the rotary mounting portion of the collet 2 is supported by a bearing. When this bearing is distinguished, there are two types, a sliding bearing and a ball bearing. The present invention relates to a disk clamping device using a ball bearing.

A typical structure of a ball bearing will be described with reference to FIG. 6 taking a radial ball bearing as an example. The ball bearings have inner and outer races 17 respectively.
The outer ring 14 and the inner ring 15 on which the a and 17b are formed, the rolling elements (balls) 9, and the retainer 16 that holds the rolling elements 9 at equal intervals.
The rolling element 9 held by the retainer 16 is held between the outer ring 14 and the inner ring 15 as shown in FIGS. 6 (H) and 6 (I).

[0004] When this bearing is used for a clamp portion of a disk, assembly of the bearing requires special techniques such as shrink-fitting and sealing of lubricating oil.
Often, bearings are manufactured separately and
As shown in FIG. 7, it is attached to a clamping part such as a collet by a method such as insert or outsert. With such a manufacturing method, there is a problem that the number of parts increases and the manufacturing cost increases. In recent years, for the purpose of reducing the number of parts, manufacturing, assembling, and reducing costs, a technology for integrally forming a portion corresponding to an outer ring of a ball bearing with a collet of a disc clamp member has been disclosed (Japanese Utility Model Application Laid-Open Publication No. Hei 9-260). 3-94651). The technique of integrally molding the outer ring of the ball bearing and the collet is realized by converting a part of the bearing into resin.

[0005]

[Problem to be solved by the invention]
The clamping device of the type shown in FIG. 51 has a structure in which the bearing portion has a structure in which a ball held by a conventional retainer is sandwiched between an inner ring and an outer ring. The necessity of special technology causes a problem that the production is difficult and the production cost is high.

SUMMARY OF THE INVENTION The present invention provides a ball bearing having a general manufacturing technique without special techniques without separately purchasing bearing parts while maintaining the advantages of the ball bearing in the rotating part of the magnetic disk clamping device. It is an object of the present invention to manufacture a magnetic disk clamp member having the above mechanism so as to reduce the manufacturing cost of the disk clamp device.

[0007]

A bearing for attaching a collet of a magnetic disk clamping device to an arm includes a rolling element for reducing the rotational frictional resistance of a rotating shaft, and a radial raceway and a thrust raceway having an L-shaped cross section. An inner ring, a radial raceway portion and a thrust raceway portion having an inverted L-shaped cross section are formed, and a collet for integrally supporting the outer ring and performing disk clamping is formed as a component. The rolling element is sandwiched by fitting the outer ring part of the bearing to form a bearing part. By forming the outer ring portion integrally with the collet, the number of components can be reduced. Further, by forming the holding member of the rolling element integrally with the raceway portion of the outer ring or the inner ring, the number of parts of the bearing portion can be reduced.

[0008] By adopting the above-mentioned structure for the collet mounting bearing of the magnetic disk clamp device, it is possible to reduce the number of parts and make the structure of the bearing easy to manufacture and assemble.
Cost reduction in the production of the clamping device is achieved.

[0009]

Embodiments will be described with reference to the drawings. FIG.
3 shows a structure of a bearing portion for mounting a collet of the disk clamp device according to the present invention. The bearing part 10 includes the outer ring 3 and the inner ring 6.
And a steel ball 9 as a rolling element. The outer race 3 has a cylindrical body and a flange extending inward as shown in FIGS. 1A and 1B, and has an L-shaped cross section, and has a cylindrical body and a flange. As a result, the bearing ring 5 composed of the radial track portion 5a and the thrust track portion 5b is formed. Further, a partition wall 4 is formed on the bearing ring 5 in order to hold the steel balls 9 at regular intervals. On the other hand, the inner ring 6 has an inverted L-shaped cross section having a cylindrical body portion and an outwardly extending flange portion, and the cylindrical body portion and the flange portion form a raceway ring 7 including a radial raceway portion 7a and a thrust raceway portion 7b. Is done. The inner ring 6 further has a claw portion 8 that engages with the outer ring 3 at the other end where the flange is not formed.
Is formed. To assemble the bearing portion 10, first, the steel ball 9 is inserted into the raceway 5 divided into a plurality of sections on the partition wall of the outer ring by manual or mechanical insertion. Next, the inner ring 6 is
1 and press-fitted so that the claw portion 8 of the inner ring 6 engages with the flange portion of the outer ring 3, whereby the rolling bearing 10 is fitted as shown in FIGS. Is completed. The bearing 10 is mounted on a collet as shown in FIG. 2, thereby completing the collet bearing of the disc clamping device. The bearing 10 is attached to the outer ring 3 of the bearing 10, but the completed bearing may be fixed to the collet 2, or the outer ring 3 may be fixed to the collet 2 in advance, and the steel ball 7 and the inner ring 6 may be incorporated.

The structure of the bearing portion 10 in the present invention is structurally simplified for both the outer ring and the inner ring.
Needless to say, it can be made of metal, but it can be easily made by ordinary molding techniques such as injection molding using plastic. With respect to the load applied to the bearing portion of the collet of the disk clamp device, the outer ring and the inner ring can be made of plastic material, and the specification can be sufficiently cleared.

In the bearing structure shown in FIG. 1, a partition wall 4 for holding a steel ball is formed on a raceway of an outer race.
As shown in FIG. 3, the partition wall 4 may be provided on the raceway 7 of the inner race 6.

In the above description, an example is shown in which the bearing portion 10 is separately mounted on the collet 2 of the disc clamp device. However, the outer ring 3 of the bearing portion and the collet 2 are integrally formed. Can also.

FIG. 4 shows an example in which the collet 2 and the outer ring of the bearing are integrally formed to form a bearing.

An outer race 12 having a raceway of the same structure as the outer race 3 shown in FIG. 1 or 3 is formed on the inner periphery of the collet 2.
Are formed integrally with the collet 2. As shown in FIGS. 1 (A) and 1 (B), the structure of the race of the outer ring portion 12 is such that a partition wall 4 for holding steel balls at equal intervals is formed. 1 (C) and 1 (D). The race of the outer race 12 is shown in FIG.
In the case shown in (A) and (B), the inner ring 13 is
A structure in which a partition wall is formed on the raceway shown in FIGS.

When the collet and the outer ring of the bearing portion are integrally formed, they are molded with a plastic resin. An example of a material to be used is polyoxymethylene (commonly called POM: polyoxmethylen) which is one of polyacetal resins. it can.

Actually, an acetal copolymer in which POM is used as a main raw material and a plurality of substances are mixed is used.

[0017]

[Effect of the invention] The disk clamp device according to the invention is:
Since the bearing portion of the collet is configured as described above, the number of component parts of the bearing portion can be reduced, and the structure can be simplified, so that it does not require particularly advanced technology for manufacturing parts, Production with plastic is also possible, and component costs can be reduced. Furthermore, since the assembling can be easily performed without requiring any special technique, the assembling and manufacturing costs can be reduced.
Further, since the rolling element raceway of the bearing has a structure that supports loads in both the radial direction and the thrust direction, a stable bearing without rattling is formed, and the life of the bearing can be extended. Further, by integrating the collet and the outer ring portion of the bearing portion, not only the number of parts can be reduced, but also the labor for attaching the bearing outer ring to the collet can be omitted, and the effect of reducing the number of assembly steps can be achieved. .

[Brief description of the drawings]

FIG. 1 shows a structure of a bearing portion for mounting a collet of a disk clamp device according to the present invention, (A) is a plan view of an outer ring,
(B) is a side sectional view of the outer ring, (C) is a plan view of the inner ring, (D)
Is a side sectional view of the inner ring, (E) is a steel ball (F) is an assembly plan view of the bearing portion, and (G) is an assembly side sectional view of the bearing portion.

FIG. 2 is a view showing a state in which the bearing unit according to the present invention is mounted on a collet.

FIG. 3 shows another embodiment of the bearing unit according to the present invention;
(A) is a plan view of the outer ring, (B) is a side sectional view of the outer ring,
(C) is a plan view of the inner ring, (D) is a side sectional view of the inner ring,
(E) shows a steel ball.

FIG. 4 is a view showing an embodiment in which the collet and the outer ring portion of the bearing of the present invention are integrally formed.

5A and 5B show a clamp arm to which a collet of a magnetic disk clamp device is attached, wherein FIG. 5A is a plan view and FIG.
FIG. 4 is a side view showing a state where a disk is clamped.

6A and 6B are components and an assembly view of a conventional radial ball bearing, wherein FIG. 6A is a plan view of an outer ring, FIG. 6B is a sectional view of a side surface of an outer ring, FIG. 6C is a plan view of an inner ring, and FIG. FIG. 2 (E) is a plan view of the cage, FIG. 2 (F) is a side sectional view of the cage, FIG. 2 (G) is a steel ball, FIG. 2 (H) is a plan view of a ball bearing assembly, and FIG.

FIG. 7 is a view in which a conventional ball bearing is mounted on a collet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc clamp arm 2 Collet 3,14 Outer ring 4 Partition wall 5,7,17a, 17b Track ring 5a, 7a Radial track section 5b, 7b Thrust track section 6,13,15 Inner ring 8 Claw section 9 Steel ball 10,11 Bearing Assembly 12 Collet outer ring 16 Cage

Claims (3)

(57) [Scope of request for utility model registration] A rolling element for reducing the rotational frictional resistance of a rotating shaft, an inner race having an L-shaped radial raceway and a thrust raceway, and an inverted L-shaped radial raceway and a thrust raceway. An outer ring formed and a collet that is integrally supported by the outer ring and clamps a disk. The inner ring and the outer ring are fitted to each other to hold the rolling element therebetween to support the collet. A disk clamp device comprising a bearing. 2. The disk clamp device according to claim 1, wherein said outer race and said collet are formed integrally. 3. The disk clamp device according to claim 1, wherein a holding member that arranges and holds the rolling elements at equal intervals is formed integrally with the outer ring or the inner ring.