JPH0557442U - ball bearing - Google Patents

Abstract

(57) [Summary] [Object] The present invention has an object to provide a ball bearing for thrust load, which has a long-lasting lubricating grease and has a long life. [Structure] The retainer 13 is provided with a plurality of ball holding holes 13a. The side walls 13b are provided on both sides of the retainer 13 over the entire circumference. The ball 9 is assembled in the ball holding hole 13a, a lubricating grease is applied to the ball 9, and the plates 7 and 10 are arranged on both sides of the retainer 13 to form the ball bearing 12.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a ball bearing, and more particularly to a ball bearing for thrust load having a structure in which a ball is held by a retainer sandwiched between two plates.

[0002]

[Prior Art]

 FIG. 3 is an enlarged sectional view of a disk drive motor portion in a conventional FDD (floppy disk drive) device, and FIG. 4 is an exploded perspective view of a bearing portion thereof.

A spindle shaft receiver 6 is fixed to the chassis 1, and a coil 4 which is a component of a motor is arranged around the spindle shaft receiver 6.

A spindle shaft 2 is press-fitted and fixed to the turntable 3, and a magnet 5 is arranged at a portion corresponding to the coil 4.

One end of the spindle shaft 2 is inserted into a spindle shaft receiver 6 and the turntable 3 is rotatably supported.

The thrust load applied in the axial direction of the spindle shaft 2 of the turntable 3 is received by a ball bearing composed of the plates 7, 10, the retainer 8, and the ball 9.

[0007]

[Problems to be solved by the device]

 In the conventional ball bearing 11 shown in FIGS. 3 and 4, grease for lubrication is applied to the balls 9 in order to reduce friction and prolong the life.

However, this grease accumulates between the retainer 8 and the plates 7 and 10 as the ball 9 rotates, and is pushed out by the centrifugal force of the rotating ball bearing. Then, the grease is gradually pushed outward in the radial direction from the vicinity of the contact portion between the ball 9 and the plates 7 and 10, and the lubrication of the ball is reduced.

Therefore, there is a problem that the life of the ball bearing 11 is short.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a ball bearing for thrust load, which retains grease for a long time and has a long life.

[0011]

[Means for Solving the Problems]

 The present invention provides a plurality of balls having the same diameter, a ring-shaped retainer having a thickness smaller than the diameter of the balls, arranged in a ring shape, and rotatably holding the balls, and both sides of the retainer. In a ball bearing composed of two annular plates that are respectively located at the center of the ball and are rotatable relative to each other with the ball sandwiched between them, the retainer is a circle that is radially outside of the portion where the ball is held. It will have a side wall on the circumference.

[0012]

[Action]

 The side wall provided on the retainer prevents the grease from moving further outward in the radial direction even if the grease is pushed outward by the centrifugal force in the radial direction.

Therefore, the grease is retained inside the side wall of the retainer.

[0014]

【Example】

 FIG. 1 is an exploded perspective view showing an embodiment of the present invention, and FIG. 2 is a side view of a part thereof in section.

The ball bearing 12 of the present embodiment is composed of the plates 7 and 10, the retainer 13 and the balls 9 similarly to the ball bearing 11 of the conventional example.

The retainer 13 made of an annular plate is provided with spherical ball holding holes 13a at 12 positions equally divided on the circumference.

Side walls 13b are provided on both sides of the outer circumference of the retainer 13, and the inner side surface 13c of the side wall 13b is slightly outside the ball holding hole 13a.

The heights of the side walls 13b on both sides of the retainer 13 are smaller than the diameter dimension of the ball 9, and when the plates 7 and 10 are arranged on both sides of the retainer 13, the side walls 13b are attached to the plates 7 and 10. It is designed not to come into contact with.

The balls 9 are assembled into the ball holding holes 13 a of the retainer 13 having the above-described shape, the grease for lubrication is applied to the balls, and the plates 7 and 10 are arranged on both sides of the retainer 13. Assemble the ball bearing 12.

Here, when the plate 10 rotates with respect to the plate 7 while receiving a load in the thrust direction, the balls 9 held by the retainer 13 rotate on the circumference, and accordingly, the retainer 13 also The plate 10 rotates in the rotating direction. The rotation speed of the retainer 13 at this time is almost half of the rotation speed of the plate 10.

A centrifugal force acts on the grease applied to the ball 9 and the grease attached on the retainer 13 by the rotation of the ball 9 and the retainer 13, and a force to push the grease outward in the radial direction acts.

However, since there is the inner side surface 13c of the side wall 13b outside the ball 9 of the retainer 13, the grease is stopped at the inner side surface and does not move further outward.

Therefore, the grease is retained in the vicinity of the balls 9, the balls 9 can be lubricated for a long time, and the wear of the balls 9 and the plates 7 and 10 is reduced.

Therefore, the ball bearing 12 has improved durability and extended life.

[0025]

[Effect of the device]

 As described above, according to the present invention, the side wall provided on the outer peripheral portion of the retainer prevents the grease from moving outward in the radial direction, so that the grease is retained in the ball bearing to lubricate the ball for a long period of time.

Therefore, the durability of the ball bearing is improved and the life is extended.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

2 is a side view of the embodiment of FIG. 1. FIG.

FIG. 3 is a cross-sectional view of a drive motor unit of a conventional FDD device.

FIG. 4 is an exploded perspective view of the ball bearing of FIG.

[Explanation of symbols]

 1 Chassis 2 Spindle Shaft 3 Turntable 4 Coil 5 Magnet 6 Spindle Shaft Receiver 7,10 Plate 8,13 Retainer 9 Ball 11,12 Ball Bearing 13a Ball Holding Hole 13b, 13c Sidewall

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sakaguchi ▲ Takahiro Hiroshi 3-7-3 Nakamachi, Musashino-shi, Tokyo Inside Tiaque Co., Ltd. (72) Yoji Abe 3-7-3 Nakamachi, Musashino-shi, Tokyo No. Tiaque Co., Ltd. (72) Inventor Daihachiro Takasu 3-7-3 Nakamachi, Musashino-shi, Tokyo Within Tiaque Co. (72) Inventor Hiroshi Yagawara 3-7-3 Nakamachi, Musashino-shi, Tokyo Tiaac Within the corporation

Claims (1)

[Scope of utility model registration request] 1. A plurality of balls having the same diameter, an annular retainer that has a thickness smaller than the diameter of the balls, is arranged in an annular shape, and holds the balls rotatably, and the retainer. A ball bearing formed of two annular plates that are located on both sides of the ball and are rotatable relative to each other with the ball interposed therebetween, the retainer is located radially outside of a portion where the ball is held. A ball bearing having a side wall on the circumference.