JP2002168260A - Assembling device for bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an assembling device for a rolling ball bearing having no need for the consideration and countermeasures for preventing a run-off of balls and a ball damage in assembling. SOLUTION: A crescent-shaped jig is used for installing a plurality of balls in the space formed between inner and outer rings of which the planes are horizontally disposed and the cores are decentralized, and each of the rings is made of a flexible sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method of assembling a bearing used in, for example, a VTR, a tape streamer, a memory disk rotating device, an LBP motor, a high-precision spindle, and other bearing devices used for a motor. It is.

[0002]

2. Description of the Related Art When assembling the ball of a deep groove ball bearing, the outer ring and the inner ring whose planes are placed horizontally are displaced from each other, and a crescent-shaped jig is formed between the eccentric inner and outer rings. In this method, the ball is dropped on the jig and the ball is dropped on the jig to assemble the ball so that the ball fits in the orbital position of the inner and outer rings. Conventionally, a crescent-shaped jig used for assembling a bearing has been made of metal.

[0003]

When a ball is dropped on such a crescent-shaped jig to assemble a bearing, the ball is bounced by the crescent-shaped jig when dropping, and may jump out of the bearing. Sometimes. In the case of assembling double row ball bearings, after putting the ball, take out the crescent-shaped jig and rotate it halfway while sliding the ball surface, so rotate the crescent-shaped jig so as not to damage the ball. Height adjustment and lubrication,
Furthermore, it was necessary to pay attention to the rotation speed and the like. Further, if the thickness and size of the crescent-shaped jig were made extremely thin compared to the diameter of the ball, or if the radius was made large, the jig was damaged and trouble elimination was extremely troublesome.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a rolling ball bearing which does not require consideration and measures for preventing ball jump-out and ball damage during assembly. Is to provide an assembling apparatus.

[0005]

In order to achieve the above object, the technical means of the present invention is to displace the center of the outer ring and the inner ring whose planes are placed horizontally, and to move the center between the eccentric inner and outer rings. A crescent-shaped jig used for incorporating a plurality of balls into the formed gap, wherein the jig is formed of a flexible sheet.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

The drawings show an outer ring 1 (9) and an inner ring 3 (shaft 11).
・ Inner ring 13), outer ring 1 and inner ring 3 (shaft 11 / inner ring 1)
3) shows an embodiment of a deep groove ball bearing composed of a plurality of balls 5 incorporated between 3), using a bearing assembly device of the present invention comprising a jig 6 having a substantially crescent shape in plan view. The balls 5 are accommodated in the positions of the raceway surfaces 2 (10) and 4 (14) of the outer and inner rings. This bearing includes both a type having a single row of raceway surfaces 2 and a type having a double row of raceway surfaces 10, and can be selected as appropriate.

In the ball bearing, the center of the outer ring 1 and the inner ring 3 (shaft 11 and inner ring 13) whose planes are placed horizontally are shifted (eccentric), and the outer ring 1 and the inner ring 3 (shaft 11 and inner ring 13) in the eccentric state are shifted. A crescent-shaped jig 6 as an assembling apparatus of the present invention is arranged in the gap 8 between the balls, and the balls 5 are sequentially dropped onto the jig 6 and incorporated. Thereafter, the cores of the outer ring 1 and the inner ring 3 (the shaft 11 and the inner ring 13) are aligned, the jig 6 is removed, and finally, the balls 5 are equally arranged and a retainer (not shown) is mounted. In the drawing, the sealing plate (seal / shield) is not installed,
A sealing plate may be attached. Further, a lubricating oil or lubricant may be provided inside the bearing. The bearing assembled using the crescent-shaped jig 6 is not limited to the bearing of the present embodiment at all, but covers all bearings that can be assembled within the scope of the present invention.

The crescent-shaped jig (bearing assembling apparatus) 6 is formed of a flexible thin sheet and has a desired size, a desired diameter, and a desired thickness in a substantially crescent shape in plan view. The jig 6
Depends on the size, diameter,
The thickness and the like can be arbitrarily set and are not limited.

The material of the flexible thin sheet constituting the crescent-shaped jig 6 is not particularly limited, but for example, the following materials are exemplified.
It should be noted that each specific example is merely an embodiment, and is not to be construed as limiting in any way, and can be appropriately set and changed within the scope of the present invention. Various rubbers, desirably rubbers with low resilience (rebound resilience of 10% or less). For example, a silicon rubber sheet, a nitrile rubber sheet, an acrylic rubber sheet, a fluorine rubber sheet, a butyl rubber sheet, and the like are typical examples. Various plastics. For example, PTFE sheet, PBT
Representative examples include a elastomeric sheet and a nylon-based elastomer sheet. Various papers. For example, a clean paper sheet is a typical example. Various cloths. For example, a nonwoven fabric (clean room specification) sheet is a typical example.

As described above, since the crescent-shaped jig 6 is a thin flexible sheet, it can be easily pulled out and does not damage the ball 5 even if it comes into contact with the ball 5 at that time. Further, even when the ball 5 is dropped during assembly, the ball 5 does not bounce, so that the ball 5 does not jump out of the bearing. In the case of a bearing constituted by incorporating a ball having a distance between the balls 5 of 50% or less of the ball diameter, particularly a ball diameter of 2 mm or less, the holding portion cannot withstand repeated loads with the conventional crescent-shaped jig. Although it may be damaged, such a problem can be solved by assembling using a crescent-shaped jig 6 made of a flexible thin sheet, and a ball bearing having the above configuration can be manufactured. Further, since the crescent-shaped jig 6 is made of a flexible sheet, the jig 6 can be bonded to a metal part, and can be placed on a ball or a metal base. (PCD: Pitch C
It can be used even when the diameter is large.

[0012]

Next, an embodiment of an assembling method using the bearing assembling apparatus of the present invention and an embodiment of a ball bearing assembled by this method will be described.

The structure of the first embodiment is shown in FIGS.
In this embodiment, a crescent-shaped jig 6 as the present apparatus is used when assembling a single-row deep groove ball bearing.

First, a crescent-shaped jig 6 is formed into an elastic-plastic sheet in a gap 8 formed between the outer ring 1 and the inner ring 3 which are relatively eccentric with a plane placed horizontally on a base 7. The jig 6 is provided with a desired number of balls 5.
Is dropped and assembled (see FIGS. 1 to 3). Thus, in this embodiment, since the crescent-shaped jig 6 is made of an elastic-plastic sheet, it does not bounce even if the ball 5 falls. The crescent-shaped jig 6 may be simply placed on the base 7 or may be adhered and integrated with the base 7.

Next, when the crescent-shaped jig 6 is simply placed on the base 7, after the desired number of balls 5 have been inserted,
The cores of the outer ring 1 and the inner ring 3 are aligned (at this time, the incorporated ball 5 is shifted to one side).
The crescent-shaped jig 6 may be pulled out from the vacant space on the opposite side in a state where is shifted to one side, or may be lowered together with the base 7 (see FIG. 4). When the crescent-shaped jig 6 is bonded to the base 7, the jig 6 is lowered together with the base 7. After the crescent-shaped jig 6 disappears, the cage is mounted with the balls 5 arranged at equal intervals, and the deep groove ball bearing is assembled.

FIGS. 5 to 8 show the structure of the second embodiment.
In this embodiment, when assembling a double-row deep groove ball bearing having a double-row raceway surface 10 on the outer ring 9, a crescent-shaped jig 6 as the present apparatus is used.

In this embodiment, the outer race 9 has a double row raceway surface 10.
10, one inner raceway surface 12 is provided directly on the shaft 11, and the other inner raceway surface 14 is provided on the inner race 13 fixed to the shaft 11, and the inner race 13 fixed to the shaft 11
And the outer ring 9 is placed horizontally on the base 7 and relatively eccentric. A crescent-shaped jig 6 is installed on a base as an elastic-plastic sheet in a gap 8 formed between the outer ring 9 and the inner ring 13 in an eccentric state.
A desired number of balls 5 are dropped on the lower row of balls 15, and the jig 6 is placed on the lower row of balls 15.
Another crescent-shaped jig 6 similar to the above is placed, and a desired number of balls 5 are dropped on the jig 6 to incorporate the upper row of balls 16 (see FIGS. 5 to 7).

Also in this embodiment, a crescent-shaped jig 6
However, since the ball 5 is made of an elastic-plastic sheet, it does not bounce even if the ball 5 comes down. Even in this embodiment, the crescent-shaped jig 6 that is in contact with the base 7 may be simply placed on the base 7 or may be bonded to and integrated with the base 7.

Then, the crescent-shaped jig 6 is simply attached to the base 7.
If placed above after putting the balls 5 of the desired number, combined core of the outer ring 9 and the inner ring 13, then the ball 5 incorporating still in a state in which displaced in one, vacant opposite side of which The crescent-shaped jig 6 used for assembling the upper row of balls 16 and the crescent-shaped jig 6 used to assemble the lower row of balls 15 may be pulled out from the space, or the lower crescent-shaped jig 6 may be pulled out. 8 may be lowered together with the base 7 (FIG. 8).
reference). When the crescent-shaped jig 6 is bonded to the base 7, the jig 6 is lowered together with the base 7. After the lower row 15 is assembled, the crescent-shaped jig 6 using the lower row 15 may be removed before the upper row 16 is assembled.

After the crescent-shaped jig 6 is removed, the balls 5 are arranged at equal intervals, a retainer (not shown) is mounted, and a double-row deep groove ball bearing is assembled. In this case, the inner ring 13 fixed in the axial direction may be configured so that the inner ring 13 can be fixed by press-fitting with a fitting allowance, with a fitting gap, and then by injecting an adhesive later.

In this embodiment, a crescent-shaped jig 6 made of a flexible sheet may be used as the crescent-shaped jig used when the lower row of balls 15 is assembled. You don't have to.

The ball diameter is small, for example, the ball diameter is 2 mm.
In the case of a double row ball bearing incorporating the following balls 5, the gap between the balls 5 of the double row ball bearing is 1/2 of the ball diameter.
In the case of less than (50% or less with respect to the ball diameter), with the conventional crescent-shaped jig (curved arm), the holding portion of the crescent-shaped jig cannot withstand repeated loads after the ball is inserted, and may be damaged. . Therefore, if assembling is performed using a crescent-shaped jig 6 made of an elastic-plastic thin sheet as in this embodiment,
Thus, the gap between the balls 5 in each row is 5 to the ball diameter.
Even a double-row ball bearing of 0% or less can be assembled safely and reliably, and the problem of this point is also solved.

Further, the outer race 9 has a double row of raceway surfaces 10
And the clearance between the balls 5 in each row is 1 to the ball diameter.
The pitch circle diameter of the ball (PCD: Pitch Cir
cleDiameter) is 15 times or more the ball diameter. For example, if the PCD of the ball 5 is 15 times the ball diameter, the conventional metal crescent-shaped jig (curved arm) cantilever the moment. It is too large to withstand repeated assembly. Therefore, if assembling is performed using a crescent-shaped jig 6 made of an elastic-plastic thin sheet as in the present embodiment, the gap between the balls 5 in each row and the ball diameter in this manner is larger than the ball diameter. If it is 100% or less, even if the ball 5 has a double-row ball bearing whose PCD is 15 times or more the ball diameter, it can be assembled safely and reliably, and the problem of this point is also solved.

FIGS. 9 and 10 show the structure of the third embodiment. In this embodiment, the outer race 9 has multiple rows of raceway surfaces 10, one inner raceway surface 12 is provided directly on the shaft 11, and the other inner raceway surface 14 is fixed to the shaft 11 (adhesion).
A double row ball bearing provided on the inner ring 13 to be fixed, wherein the fixed inner ring 13 side is shifted downward, the center of the outer ring 9 and the inner ring 13 is shifted, and the lower ball row 15 and the upper ball row 16 Ball 5 in both rows
Is inserted (FIG. 9), the outer ring 9 and the inner ring 13 are aligned, the balls 5 are arranged equally, and the retainer 17 is mounted to assemble the double row deep groove ball bearing. FIG. 10 shows a state in which the inner ring 13 side is turned up after assembly. In the figure, reference numeral 18 denotes a sealing plate.

[0025] When assembling the present embodiment the bearings described above, the first embodiment and second embodiment but attempts to use a jig 6 crescent made of flexible sheets used in conventional metallic crescent jig ( Either of these two types may be used, but an inner ring with a fitting gap (to be bonded later) 1
The feature is to assemble with 3 down. That is,
If an attempt is made to assemble with the inner ring 13 having a fitting gap upward, the inner ring 13 falls and the axial position of the inner ring 13 is too low, and the position of the raceway surface 10 of the outer ring 9 and the raceway surface 14 of the inner ring 13 are reduced. This is because there may be the height of the position can not be assembled not match.

When assembling this double-row deep groove ball bearing using a crescent-shaped jig 6 made of a flexible sheet,
Assembling is performed using the same method as in the second embodiment described above.

[0027]

According to the present invention, since the ball is dropped on a crescent-shaped jig at the time of assembling the bearing, the ball does not bounce and the ball does not jump out of the bearing. . Furthermore, when assembling the double row ball bearing, there is no need to consider or take measures to prevent the ball from being damaged when taking out the crescent-shaped jig. Even if the space between the balls is small, even if the crescent-shaped jig is large compared to the diameter of the balls, the assembling operation can be performed without failure.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an assembled state of a first embodiment.

FIG. 2 is a view of the state of FIG. 1 as viewed from a base side.

FIG. 3 is a sectional view taken along line III-III of FIG. 1;

FIG. 4 is a plan view showing a state in which the outer ring and the inner ring are aligned after ball insertion, and the assembling apparatus of the present invention is pulled out.

FIG. 5 is a sectional view showing an assembled state of the second embodiment.

FIG. 6 is a sectional view taken along line VI-VI of FIG. 5;

FIG. 7 is a sectional view taken along line VII-VII of FIG. 5;

FIG. 8 is a plan view showing a state where the outer ring and the inner ring are aligned after the ball is put in, and the assembling apparatus of the present invention is pulled out.

FIG. 9 is a sectional view showing an assembled state of the third embodiment.

FIG. 10 is a cross-sectional view after completion of the assembly of the third embodiment.

[Explanation of symbols]

 1, 9: Outer ring 2, 10: Outer ring raceway 3, 13: Inner ring 4, 12, 14: Inner ring raceway 5: Ball 6: Crescent-shaped jig 7: Base 8: Clearance 11: Shaft 15: Lower side Ball row 16: Upper row

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Takamizawa 1-5-50 Kugenuma Shinmei, Fujisawa-shi, Kanagawa Japan Seiko Co., Ltd. F-term (reference) 3J017 HA03

Claims (1)

[Claims] 1. A crescent-shaped jig used to shift the cores of an outer ring and an inner ring whose planes are placed horizontally and to insert a plurality of balls into a gap formed between the eccentric inner and outer rings. A bearing assembly device, wherein the jig is formed of a flexible sheet.