JP2002130308A - Assembling method for bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a scuff and the like from being made on a slide contact surface during assembling, by exactly avoiding the scattering, adherence and the like of oil. SOLUTION: When an inner ring 15 is fitted to the external peripheral surface of a sleeve 11, a volatile liquid like high-grade alcohol, hexane and the like is applied to a slide contact surface between the inner ring 15 and the sleeve 11. Thereby, the inner ring 15 is smoothly fitted to the sleeve 11, preventing a scuff and the like on the slide contact surface. Then, after the volatile liquid applied to the surface of the slide contact between the inner ring 15 and the sleeve 11 is volatilized, an adhesive is injected into the gap between the inner ring 15 and the sleeve 11 to fix the inner ring 15 to the external peripheral surface of the sleeve 11. The volatile liquid applied to the slide contact surface between the inner ring 15 and the sleeve 11 does not disturb the fixture of the inner ring 11 and the sleeve 11 by use of the adhesive, because the liquid has already volatilized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for a bearing device that does not want to adhere to oil, for example, a bearing device applied to a spindle motor for a hard disk drive (HDD) or a motor for a memory disk rotating device, and a pivot bearing. The present invention relates to a method for assembling a simple bearing device.

[0002]

2. Description of the Related Art Referring to FIG. 5, as a conventional bearing device 50 for a water pump for an automobile engine, Japanese Utility Model Laid-Open Publication No. 2-80224 discloses a plurality of pump shafts 51 having a substantially V-shaped cross section on the outer peripheral surface. The groove 52 is formed so as to form a predetermined angle with respect to the axis O of the pump shaft 51 and to be substantially parallel to each other. Pump shaft 51
During the assembly in which the pulley sheet 53 is fitted, an oil film is formed on the fitting surface, and the oil film is
Maintained by

[0003]

In the above-described conventional bearing device 50, the oil film formed on the fitting surface between the pump shaft 51 and the pulley sheet 53 and maintained by each groove 52 causes the pulley sheet for the pump shaft 51 to move. 53 Prevents galling during press fitting. Therefore, the present invention cannot be applied to a bearing device which does not like the adhesion of oil, for example, a bearing device applied to a spindle motor for an HDD or a motor for a memory disk rotating device, a pivot bearing, or the like.

That is, for example, in a spindle motor for a HDD or a swing arm pivot bearing, adhesion of oil causes a problem such as scattering of oil on a disk surface. Also,
In a structure in which a bearing is bonded to a housing or the like using an adhesive, if oil adheres to the bonding surface, the bonding force is reduced or bonding is impossible. Therefore, the conventional bearing device 50 that forms an oil film on the fitting surface cannot be applied.

According to the present invention, while it is possible to reliably prevent the scattering and adhesion of oil, etc., it is possible to surely prevent the sliding contact surface from being seized at the time of assembling. It is an object of the present invention to provide a method of assembling a bearing device that can be suitably used for a bearing device that does not like the above.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to apply a volatile liquid to a required portion to be brought into sliding contact with the assembly of a bearing device before assembling, and to make the sliding contact before volatilization of the volatile liquid. This is achieved by a method of assembling a bearing device, which is characterized in that the operation is completed.

[0007]

In the method for assembling a bearing device according to the present invention,
A volatile liquid is applied to a required part to be brought into sliding contact with the assembling before assembling, and the volatile liquid is made to function as a lubricant, and the sliding operation is completed before the volatile liquid is volatilized.

[0008] Specific examples of the volatile liquid include higher alcohols and hexane. The portion to which the volatile liquid is applied is, for example, the outer peripheral surface of the outer ring that is in sliding contact with the housing, and the inner peripheral surface of the inner ring that is in sliding contact with the shaft.

The fixing of the bearing device to the housing, the shaft and the like in the present invention may be performed by bonding with an adhesive or by fixing. In the case of bonding with an adhesive, bonding is performed after volatilization of the applied volatile liquid, so that the bonding is not hindered by the volatile liquid.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a sectional view showing a bearing device to which a method of assembling a bearing device according to a first embodiment of the present invention is applied.

In FIG. 1, a bearing device 10 has a through hole 1
Sleeve 1 in which a rotating shaft (not shown) is inserted into 1a
1 and a housing 12 arranged on the same rotation axis as the sleeve 11. The housing 12 has a large number of balls 1.
It is rotatable relative to the sleeve 11 via the inner ring 15 and the inner ring 15.

Each of the balls 13 on the right side in FIG.
6, while being rotatably held by the sleeve 1, the sleeve 1 is guided by a raceway surface 11b formed on the outer circumferential surface of the sleeve 11 and a raceway surface 12a formed on the inner circumferential surface of the housing 12.
1 and the housing 12. In addition, each of the balls 14 on the left side in FIG. 1 is rotatably held by a retainer 17, and has a raceway surface 1 formed on an outer peripheral surface of an inner ring 15.
5 a and a track surface 12 b formed on the inner peripheral surface of the housing 12, and are interposed between the inner race 15 and the housing 12. The inner ring 15 is fixed to the outer peripheral surface of the sleeve 11 by an adhesive injected after assembly.

The operation of this embodiment will be described. Bearing device 1
0 is assembled with each member degreased. Inner ring 1
When the sleeve 5 is fitted to the outer peripheral surface of the sleeve 11, a volatile liquid such as higher alcohol or hexane is applied to the sliding contact surface between the inner ring 15 and the sleeve 11. Thereby, the inner ring 15 is smoothly fitted into the sleeve 11 while preventing galling or the like of the sliding contact surface. At this time, if oil is applied to the sliding contact surface between the inner ring 15 and the sleeve 11 as in a conventional bearing device 50 shown in FIG. 5, for example, galling of the sliding contact surface can be prevented.
Since degreasing after the inner ring 15 is inserted into the sleeve 11 is extremely difficult, oil remains between the inner ring 15 and the sleeve 11. Therefore, it becomes impossible to fix the inner ring 15 to the sleeve 11 by the adhesive (described later).

Then, after the volatile liquid applied to the sliding contact surface between the inner ring 15 and the sleeve 11 is volatilized, a preload is applied to the inner ring 15 to urge the inner ring 15 rightward in FIG.
Then, the inner ring 15 is fixed to the outer peripheral surface of the sleeve 11 with an adhesive. At the time of fixation, the volatile liquid applied to the sliding contact surface between the inner ring 15 and the sleeve 11 has already volatilized,
Does not hinder the fixation of the inner ring 15 to the inner ring.

FIG. 2 is a sectional view showing a bearing device to which a method for assembling a bearing device according to a second embodiment of the present invention is applied.

In FIG. 2, a bearing device 20 includes a plurality of balls 22 and 23 on the left and right sides in FIG. 2 and outer rings 24 and 25 on the left and right sides in FIG. The rotation shaft 26 is rotatably supported by the housing 27 through the intermediary of the housing 27. Outer rings 24, 2 on the left and right sides in FIG.
Between the five, a coil spring 28 is provided.

The operation of this embodiment will be described. Bearing device 2
No. 0 is assembled with the outer diameter surfaces of the housing 27 and the outer races 24 and 25 degreased. When the outer ring 25 on the right side in FIG. 2 is fitted to the housing 27 with a margin, a volatile liquid such as higher alcohol or hexane is applied to a sliding contact surface between the outer ring 25 and the housing 27. Thereby, the outer ring 2
5 is smoothly inserted into the housing 27 while preventing the sliding surface from galling.

Then, after the volatile liquid applied to the sliding contact surface between the outer ring 25 and the housing 27 is volatilized, the adhesive is applied to the outer ring 25 and the housing via an adhesive filling hole 27a provided in the housing 27. 27. Thus, the outer ring 25 is fixed to the inner peripheral surface of the housing 27 by the adhesive. At this time, the outer ring 25 and the housing 27
The volatile liquid applied to the sliding contact surface has already volatilized,
The fixation of the outer ring 25 to the housing 27 by the adhesive is not hindered by the volatile liquid.

On the other hand, after the outer ring 24 on the left side in FIG. 2 is loosely fitted in the housing 27, an adhesive is injected between the outer ring 24 and the housing 27 through an adhesive filling hole 27b provided in the housing 27. It is fixed to the inner peripheral surface of the housing 27 by an adhesive.

FIG. 3 is a sectional view showing a bearing device to which a method of assembling a bearing device according to a third embodiment of the present invention is applied.

In FIG. 3, the bearing device 30 has a through hole 3
Sleeve 3 in which a rotating shaft (not shown) is inserted into 1a
1 and a housing 32 arranged on the same rotation axis as the sleeve 31. The housing 32 is rotatable relative to the sleeve 31 via a pair of left and right bearings 33 and 34 in FIG. Each of the bearings 33 and 34 has a number of balls 38 rotatably held by a holder 37 between the outer ring 35 and the inner ring 36. Each of the bearings 33 and 34 has an interference with the housing 32, and both the outer ring 35 and the inner ring 36 are press-fitted into the housing 32 and the sleeve 31 without using an adhesive.

The operation of this embodiment will be described. Bearing device 3
0 is the outer diameter surface, the inner diameter surface of the bearings 33 and 34, and the housing 3
2. Assembled with the sleeve 31 degreased. The outer ring 35 and the inner ring 36 of each bearing 33, 34 are connected to the housing 3
2 and the sleeve 31 respectively.
Sliding surface between the inner ring 36 and the housing 32 and the inner ring 36 and the sleeve 3
A volatile liquid such as a higher alcohol or hexane is applied to the sliding contact surface with No. 1. In this state, the bearings 33, 34
To the housing 32 and the sleeve 31 smoothly to a predetermined position. This prevents galling of the sliding contact surface between the outer ring 35 and the housing 32 and the sliding contact surface between the inner ring 36 and the sleeve 31. Then, it is finely moved in the direction in which the inner rings approach each other to obtain the desired rigidity, and a preload is applied.

FIG. 4 is a sectional view showing a bearing device to which a method for assembling a bearing device according to a fourth embodiment of the present invention is applied.

In FIG. 4, the bearing device 40 has a through hole 4
Sleeve 4 into which a rotating shaft (not shown) is inserted.
1 and a housing 42 arranged on the same rotation axis as the sleeve 41. The housing 42 is rotatable relative to the sleeve 41 via a pair of left and right bearings 43 and 44 in FIG. Each of the bearings 43 and 44 has a number of balls 48 rotatably held by a retainer 47 between the outer ring 45 and the inner ring 46. Outer ring 45 of each bearing 43, 44
Are fixed to the inner peripheral surface of the housing 42 by an adhesive injected after assembly.

The operation of the present embodiment will be described. Bearing device 4
0 is assembled with each member degreased. When the outer ring 45 and the inner ring 46 of each of the bearings 43 and 44 are fitted and inserted into the housing 42 and the sleeve 41, respectively, a high alcohol, A volatile liquid such as hexane is applied respectively. As a result, the outer ring 45 and the inner ring 46 of each of the bearings 43 and 44 are connected to the housing 42 and the sleeve 4.
4 are respectively pre-loaded from the left and right directions in FIG. 4 to smoothly fit and prevent the sliding surfaces from galling.

Then, after the volatile liquid applied to the sliding contact surface between the outer ring 45 and the housing 42 and the sliding contact surface between the inner ring 46 and the sleeve 41 is volatilized, the housing 42
Through the adhesive filling hole 42a provided in the outer ring 4
An adhesive is injected between the housing 5 and the housing 42. Thus, the outer ring 45 is fixed to the inner peripheral surface of the housing 42 by the adhesive. At this time, the volatile liquid applied to the sliding contact surface between the outer ring 45 and the housing 42 has already volatilized, and the fixation of the outer ring 45 to the housing 42 by the adhesive is not hindered by the volatile liquid.

As described above, according to each of the above embodiments, at the time of assembling, a higher alcohol,
A volatile liquid such as hexane is applied to function as a lubricant. For example, at the time of bonding the sliding surfaces after assembly, the adhesion is not hindered by volatilization of the volatile fluid.

Therefore, scattering and adhesion of oil can be reliably avoided, for example, errors due to scattering of oil on the disk surface and poor adhesion due to adhesion of oil to the bonding surface can be avoided. In spite of this, the lubricating action of the volatile liquid allows the components to be smoothly inserted and assembled at the time of assembling, so that the sliding contact surface at the time of assembling can be reliably prevented. Moreover, the first and second
In the case where an adhesive is injected between the sliding contact surfaces after the assembling as in the fourth embodiment, the adhesion is not hindered by the volatilization of the volatile liquid. Thus, the present invention can be applied to a bearing device applied to a spindle motor for an HDD or a motor for a memory disk rotating device, and to a bearing device such as a pivot bearing that does not want to adhere to oil.

[0029]

As described above, according to the present invention, a volatile liquid is applied to a required portion which is brought into sliding contact with the assembly before assembly, so that scattering and adhesion of oil can be reliably avoided. In spite of this, it is possible to reliably prevent galling of the sliding contact surface during assembly. Thus, for example, the present invention can also be suitably used for a bearing device that does not want to adhere to oil.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a bearing device to which a method for assembling a bearing device according to a first embodiment of the present invention is applied.

FIG. 2 is a sectional view showing a bearing device to which a method of assembling a bearing device according to a second embodiment of the present invention is applied.

FIG. 3 is a sectional view showing a bearing device to which a method of assembling a bearing device according to a third embodiment of the present invention is applied.

FIG. 4 is a sectional view showing a bearing device to which a method for assembling a bearing device according to a fourth embodiment of the present invention is applied.

FIG. 5 is a cross-sectional view showing a bearing device of a conventional water pump for an automobile engine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Bearing device 11 Sleeve 11a Through-hole 12 Housing 13,14 Ball 15 Inner ring 16,17 Cage

Claims (1)

[Claims] 1. A bearing device, characterized in that a volatile liquid is applied to a required portion to be brought into sliding contact with the assembly of the bearing device before assembly, and the sliding contact operation is completed before the volatile liquid evaporates. Assembly method.