JPH11173338A - Capped rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a capped rolling bearing having a seal member to prevent leakage of grease. SOLUTION: This capped rolling bearing comprises an inner ring 1; an outer ring 2; a rolling body arranged between the inner and outer rings; and a seal member 6 securely fitting an outer peripheral part in a peripheral groove 5 formed in the end part of the inner peripheral surface of the outer ring 2. A tongue piece 9 extending to the internal part of the bearing and pressed in the inner peripheral surface of the outer ring is formed on the inside surface 8 of the lower part of the fit-in part of the seal member 6 in the peripheral groove 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed rolling bearing used for a spindle motor for a hard disk drive (hereinafter referred to as HDD), for example.

[0002]

2. Description of the Related Art As a conventional sealed rolling bearing, for example, a ball bearing shown in FIG. 3 is known. That is, this is the inner ring 20
And an outer ring 21 and a ball 23 disposed between the inner and outer rings 20 and 21
And a plastic sealing member 25 for fitting and fixing an outer peripheral portion 25a to a peripheral groove 24 formed at an end of an inner peripheral surface 21a of the outer ring 21. 26 is a holder for holding the ball 23. The inner peripheral portion 25b of the seal member 25 forms a non-contact sealing portion with the inner ring 20, for example.

[0003]

The ball bearing of the HDD spindle motor mainly rotates the outer ring, but due to the recent increase in speed, the ball bearing of the outer peripheral portion 25a of the seal member 25 and the peripheral groove 24 of the outer ring 21 have been fitted. The grease inside the bearing is strongly pushed away by the rotational centrifugal force of the bearing, and the seal member 25 and the circumferential groove 24 are pressed.
If the fitting state is not sufficiently controlled, the grease may leak out, causing oil contamination inside the HDD device.

An object of the present invention is to provide a sealed rolling bearing having a seal member for preventing grease from leaking.

[0005]

As means for solving the above problems, an inner ring, an outer ring, a rolling element disposed between the inner and outer rings, and an outer peripheral portion formed in a peripheral groove formed at an inner peripheral surface end of the outer ring. And a seal member for fitting and fixing the seal member, on the inner surface of the lower part of the fitting portion to the circumferential groove of the seal member,
A tongue is formed to extend inside the bearing and press-fit into the inner peripheral surface of the outer ring.

[0006] Further, the inner peripheral surface of the tongue piece of the seal member is formed as an inclined surface whose diameter increases from the root to the tip.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a specific embodiment of the present invention will be described with reference to FIG. The rolling bearing of the present invention, for example, a ball bearing, comprises an inner ring 1, an outer ring 2, and inner and outer rings 1, 2.
The ball 3 disposed between the two and held by the retainer 4, the peripheral groove 5 formed on the inner peripheral surface 2a at both ends of the outer ring 2, and the rubber or plastic made by fitting and fixing the outer peripheral portion 6a to the peripheral groove 5 And a sealing member 6. The inner peripheral portion 6b of the seal member 6 forms a non-contact sealing portion S with the outer peripheral surface of the inner race 1.

A tongue piece 9 extending inside the bearing is formed on the lower inner side surface 8 of the fixed part 7 fitted in the peripheral groove 5 of the outer peripheral part 2 a of the seal member 6. The surface 2a is press-fitted and fixed with a predetermined interference.

The inner peripheral surface 10 of the tongue piece 9 of the seal member 6 is formed as an inclined surface whose diameter increases from the root 9a toward the tip 9b. With this configuration, even when the grease inside the bearing is pressed against the fitting fixing portion 7 of the seal member 6 during rotation of the outer ring, the action of returning the grease to the inside of the bearing along the inclined inner peripheral surface 10 is further ensured. In addition,
In addition to the above embodiment, as shown in FIG.
Alternatively, the step 5a may be formed, and the tongue 9 of the seal member 6 may be housed in the step 5a. If you do this,
Interference between the tongue piece 9 and the retainer 4 can be reliably prevented, and the present invention can be applied even when there is no dimensional allowance between the tongue piece 9 and the retainer 4.

[0010]

As described in detail above, since the tongue piece of the seal member is pressed against the inner peripheral surface of the outer ring, the grease is not directly pushed into the fitting portion of the seal member into the circumferential groove, and the grease is not greased. Leakage can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of a sealed rolling bearing according to an embodiment of the present invention.

FIG. 2 is a sectional view of a sealed rolling bearing according to another embodiment of the present invention.

FIG. 3 is a sectional view of a conventional sealed rolling bearing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 3 Ball 4 Cage 5 Peripheral groove 6 Seal member 7 Fixed part 8 Lower inner surface 9 Tongue piece 10 Slant inner peripheral surface

Claims (2)

[Claims] 1. A sealed rolling bearing comprising an inner ring, an outer ring, a rolling element disposed between the inner and outer rings, and a seal member for fitting and fixing an outer peripheral portion to a peripheral groove formed at an inner peripheral surface end of the outer ring. In the inner surface of the lower part of the fitting portion to the peripheral groove of the seal member,
A sealed rolling bearing, wherein a tongue piece is formed to extend inside the bearing and press-fit into the inner peripheral surface of the outer ring. 2. The sealed rolling bearing according to claim 1, wherein the inner peripheral surface of the tongue piece is formed as an inclined surface having a diameter increasing from a root to a tip.