Double seal bearing

a sealing bearing and bearing technology, applied in the direction of bearings, shafts and bearings, rotary bearings, etc., can solve the problems of affecting the performance of the bearing, the contacting portion is weary, and the bearing is prone to dust or other contaminant produced by the bearing,

Inactive Publication Date: 2001-12-20
MINEBEA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A disadvantage inherent in the bearing of non-contacting type is that the grease contained within the bearing and dust or other contaminant produced within the bearing are tend to flow out through the clearance formed at the non contacting portion of the bearing while the inner or outer race is rotated.
However, following problems or disadvantages are present in these countermeasures.
(b) produced is a wear on the contacting portion (especially on the inner peripheral edge of the sealing plate) during the utilization of the bearing.
This leads to the leakage of the grease and the production of the dusts or particles due to wear; and
(c) The material can be employed for the sealing plate is limited to rubber materials or resinous materials.
This leads to the limitation of the application of the bearing.
(2) As for the bearing including a sealing structure such as the oil seal (the seal of contacting type), or the bearing including a sealing structure of the non-contacting type such as labyrinth seal mechanism, there is a substantial common problem that the additional space for providing such sealing means is required.
This is the essential problem for the equipment necessitating the miniturization thereof.
In addition, the cost for manufacturing the bearing is also increased.
In the case of the bearing adapted to be used in the spindle motor of the hard disk drive means, the function of the magnetic disk is affected seriously, if wear particles produced during rotation are flowing into the magnetic disk portion.
In these sealing means, although it is necessary to provide a sealing effect similar to that had been obtained by the bearing including a sealing means of contacting type, such bearing can not be adopted since it produces wear particles at the sealing contacting portion between elements.
Additionally, the distance between bearings (bearing span) is insufficient for eliminating the harmonic vibration due to the lack of the accuracy of the rotation of the motor hub and the rigidity of assembly.
The stability of the rotation is not assured.
Further, it is difficult to substantially prevent the particles within the bearing from flowing out into the disk portion.

Method used

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Experimental program
Comparison scheme
Effect test

first embodiment

[0066] the bearing of the present invention will now be described with reference to FIGS. 1 and 2.

[0067] In the structure of the bearing as shown in these figures, the bearing includes an inner race 1, an outer race 2, and a rotating body such as balls 3 retained between inner and outer races by means of retainer 4. Each side portion of the inner race 1 is provided with stepped contour including an inner shoulder 1a of smaller diameter and an outer shoulder 1b of larger diameter. Each side portion of the outer race 2 is also provided with stepped contour including an inner shoulder 2a of smaller diameter and an outer shoulder 2b of larger diameter. Each side portion of the bearing is adapted to be closed by a pair of annular sealing plates 5 and 6 such as those shown in FIG. 10. Each of these plates 5 and 6 is provided with a central opening 5a, 6a respectively.

[0068] In the first embodiment of the present invention as shown in FIG. 2, the outer peripheral portion of the inner seali...

second embodiment

[0070] In the structure of the bearing of the present invention as shown in FIG. 3, the inner peripheral portion of the inner sealing plate 5 is secured by any adhesive on the inner shoulder 11a of the inner race 1 with leaving a slight clearance (c) between the outer peripheral surface of the sealing plate 6 and the inner shoulder 2a of the outer race 2 so as to prevent the sealing plate and the outer race from contacting with each other. Thus the labyrinth seal function can be obtained. The outer peripheral portion of the outer sealing plate 6 is secured by any adhesive on the outer shoulder 2b of the outer race 2 with leaving a slight clearance (d) between the inner peripheral surface of the sealing plate 6 and the outer shoulder 1b of the inner race 1 so as to prevent the sealing plate and the inner race from contacting with each other. Thus the labyrinth seal function can be obtained.

third embodiment

[0071] In the structure of the bearing of the present invention as shown in FIG. 4, the outer peripheral portion of the inner sealing plate 5 is secured by any adhesive on the inner shoulder 2a of the outer race 2 with leaving a slight clearance (a) between the inner peripheral surface of the sealing plate 5 and the inner shoulder 11a of the inner race 1 so as to prevent the sealing plate and the inner race from contacting with each other. Thus the labyrinth seal function can be obtained.

[0072] The outer peripheral portion of the outer sealing plate 6 is also secured by any adhesive on the outer shoulder 2b of the outer race 2 with leaving a slight clearance (d) between the inner peripheral surface of the sealing plate 6 and the outer shoulder 1b of the inner race 1 so as to prevent the sealing plate and the inner race from contacting with each other. Thus the labyrinth seal function can be obtained.

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Abstract

The object of the present invention is to provide a double seal bearing including a labyrinth seal mechanism. The double seal bearing of the present invention is provided with a pair of annular inner and outer sealing plates having an central opening respectively with remaining a slight clearance between each plate and one of the inner and outer races respectively so as to assure the labyrinth seal function.

Description

[0001] 1. Technical Field[0002] The present invention relates in particular to a double seal bearing including a pair of sealing plates of non-contacting type on at least one side thereof, more particularly a double seal ball bearing especially suitable for the spindle motor of the hard disk drive means.[0003] 2. Description of the Prior Art[0004] The bearing illustrated in FIG. 11 includes a sealing structure of non-contacting type of the prior art.[0005] In this sealing structure of non-contacting type of the prior art includes at least on one end thereof a sealing plate 11. This sealing structure is of the non-contacting type in which the outer peripheral edge of the sealing plate 11 is secured on the end surface of the outer race 2, whereas the inner peripheral edge of this sealing plate is separated from the outer peripheral surface of the inner race 1.[0006] A disadvantage inherent in the bearing of non-contacting type is that the grease contained within the bearing and dust o...

Claims

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Application Information

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IPC IPC(8): F16C33/80F16C33/78
CPCF16C33/78F16C33/7859F16C33/80F16C19/06
InventorOBARA, RIKURO
OwnerMINEBEA CO LTD