JPH058032U - Collet bearing - Google Patents

Abstract

(57) [Summary] [Structure] The shaft 1 is axially moved up and down by being loosely attached to the arm by the medium mounting mechanism of the FDD. After the receiver 3 is press-fitted into the center of the disc pressure 4 and the steel ball 2 is inserted into the recess 3a of the receiver 3, the steel ball 2 is inserted into the recess 1a provided on the tip end surface of the shaft 1 and the stopper 5 prevents the stopper 3 from coming off. [Effect] Since the behavior of the bearing becomes the center of rotation, stable accuracy can be obtained and the number of parts can be reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a collet bearing, and more particularly to a collet bearing for centering a medium in a floppy disk device (hereinafter referred to as FDD) and crimping the medium onto a hub of a spindle motor.

[0002]

[Prior Art]

 FIG. 2 is a sectional view showing an example of a conventional collet bearing. The outer diameter of the shaft 6, which is loosely attached to the arm of the FDD medium loading mechanism and moves vertically in the axial direction, is press-fitted into the inner ring 7 of the radial ball bearing, and the disc pressure 10 is fixed to the outer diameter of the outer ring 9 of the radial ball bearing. It was a structure. Since the shaft 6 only has a function of press-fitting into the inner ring 7 of the radial ball bearing to maintain strength, the material is a raw material.

[0003]

[Problems to be solved by the device]

 In the conventional collet bearing described above, the shaft is finished by cutting, so that there are disadvantages that variations in the outer diameter dimension are increased due to friction of the byte and temperature changes, and fluctuations in the press-fit strength are increased. As a result, problems such as falling over time occur when the press-fitting is weak, and when the press-fitting is too strong, the roundness of the rolling surface of the steel ball of the inner ring of the radial ball bearing decreases and the clearance with the steel ball decreases. However, there is a drawback that it prevents smooth rotation. The radial ball bearing also had the drawback of having a large number of parts.

[0004]

[Means for Solving the Problems]

 The collet bearing of the present invention is a shaft that is loosely attached to a receiver that is press-fitted in the center of the disk pressure, a steel ball that is inserted into a recess provided in the center of the receiver, and the arm of the medium loading mechanism of the floppy disk device. The shaft includes a shaft that moves up and down in a direction and has a recessed portion into which the steel ball can be inserted, and a stopper that holds the shaft against the disc pressure.

[0005]

【Example】

 Next, the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the collet bearing of the present invention.

The shaft 1 is loosely attached to the arm by the medium mounting mechanism of the FDD and moves up and down in the axial direction. After the receiver 3 is press-fitted into the center of the disk pressure 4 and the steel ball 2 is inserted into the recess 3a of the receiver 3, the steel ball 2 is inserted into the recess 1a provided on the tip end surface of the shaft 1 and the stopper 5 prevents the stopper 3 from coming off. In this embodiment, since the shaft 1 has a function of moving up and down, an appropriate gap is provided in the up and down direction of the shaft 1 and the stopper 5. Further, since the shaft 1 has both the vertical movement function and the bearing function, heat treatment is performed to increase the hardness, and the receiver 3 is also increased in hardness.

[0007]

[Effect of the device]

 As described above, according to the present invention, since the behavior of the bearing becomes the center of rotation by providing the concave portion on the tip end surface of the shaft, stable accuracy can be obtained and the number of parts can be reduced. Have.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a collet bearing of the present invention.

FIG. 2 is a sectional view showing an example of a conventional collet bearing.

[Explanation of symbols]

 1,6 Shafts 1a, 3a Recesses 2,8 Steel balls 3 Receiving 4,10 Disc pressure 5 Stoppers 7 Inner ring 9 Outer ring

Claims (1)

[Claims for utility model registration] [Claim 1] A receiver press-fitted into the center of the disk pressure, a steel ball inserted into a recess provided in the center of the receiver, and an arm of a medium mounting mechanism of the floppy disk device. A collet bearing, comprising: a shaft that is mounted and moves up and down in the axial direction and has a recessed portion into which a steel ball can be inserted at a front end surface thereof;