JP2003202023A - Ball bearing and bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device with less variation in rotating torque and high rotating accuracy in a bearing device having groove-sealed lubricant and crown cages. <P>SOLUTION: This bearing device is formed of two bearings 1 having groove- sealed lubricant and crown cages 5 combined with each other. A pre-load is applied from the end face 2b of an inner ring 2 on the side opposite to the opening side of the cage pocket, a pre-load is applied from the end face 3b of an outer ring 3 on the opening side of the cage pocket, and a grease accumulating and feeding part 5h is cut out in the end face of the cage. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a hard disk drive (HDD: Hard Disk Drive), a video tape recorder (VTR: Video Tape Re).
Also called a corder), laser beam printer (LBP:
It relates to ball bearings for small motors used in laser beam printers, etc.

[0002]

2. Description of the Related Art Conventionally, a ball bearing incorporated in the above apparatus or the like has a pair of combined bearings 10 as shown in FIG.
0, 100, the direction of combination is not particularly determined, and the opening side 201 of the retainer 200, which is prone to dust generation, is faced to reduce dust generation to the outside as a bearing unit. It is generally arranged. In the figure, 300 is a shaft, 400 is bearings 100, 10.
Shows the spacer inserted between 0s. In addition, in order to improve the swinging resistance (also referred to as fretting resistance) during transportation of products, it is general that the lubricant filled in the bearing is grooved instead of being mounted on the conventional cage. is there.

[0003]

However, when the apparatus of this form is rotated, the rotation torque and its fluctuation are large because the lubricant is filled in the groove, and the vibration (NRRO) which is not synchronized with the rotation is also generated. There is a problem that it becomes large. This will be described based on another conventional technique shown in FIG. That is, the grease G collected on the opposite contact angle side of the outer ring 101 is caught in the ball 600 and moves in the rotation direction of the ball 600, and the grease G is scraped off by the crown cage 200, and the scraped grease G is removed. Torque becomes large because a large amount of oil accumulates on the outer diameter portion of the cage end surface side (pocket non-opening side) 202 and comes into contact with the grease G on the outer ring 101 side, resulting in a large resistance. Further, the grease G once scraped off is also easily caught in the balls 600, and the torque becomes unstable and becomes large. The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a ball bearing and a bearing device having a small rotational torque and a small fluctuation thereof and high rotational accuracy. .

[0004]

In order to achieve the above-mentioned object, the technical means of the present invention is such that a plurality of rolling elements are incorporated between an outer ring and an inner ring via a crown-shaped retainer, and the rolling elements are retained. In the ball bearing in which the preload is applied to the inner ring on the opening side of the container and the outer ring on the opening side of the cage, the ball bearing is provided with the grease accumulation supply unit on the end surface of the cage. Here, the position of the grease accumulation supply unit with reference to the shoulder position of the outer ring groove is S,
When the ball diameter is Da, it is preferable to satisfy the formula of S ≦ 20% × Da. Further, it is also possible to provide a mode capable of discriminating the cage mounting direction between the one end face in the axial direction and the other end face in the axial direction. Further, a bearing device is constructed by incorporating the ball bearing described above. Further, between the outer ring and either one of the inner ring and the shaft, there are a plurality of rolling elements incorporated via a crown-shaped cage. In the bearing device in which a preload is applied to the outer ring, the grease accumulation supply section is provided on the end surface of the cage. When the grease accumulation supply unit position is S and the ball diameter is Da with reference to the groove shoulder position of the outer ring, S ≦ 2
It is preferable to satisfy the formula of 0% × Da. Further, it is also possible to provide a mode capable of discriminating the cage mounting direction between the one end face in the axial direction and the other end face in the axial direction.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the ball bearing and bearing device of the present invention will be described below with reference to the drawings. Each embodiment is merely an embodiment of the present invention and should not be construed as being limited thereto. Further, each of the embodiments is compatible with both outer ring rotation and inner ring rotation.

[First Embodiment] FIGS. 1 and 2 show an embodiment of the ball bearing of the present invention. In this embodiment, two rolling ball bearings 1 and 1 are provided with inner rings 2 and 2 of each ball bearing 1 and 1 fixed to the outer periphery of a shaft 6, and a preload (axial load) is applied. 1 shows an embodiment of a bearing device combined in combination. Further, in the present embodiment, an embodiment of a bearing device in which two ball bearings are used as a pair will be described, but the ball bearing is not limited to a combination of two ball bearings. According to the present embodiment, the spacer 7 is arranged between the outer rings 3 and 3 of the ball bearings 1 and 1, and the cage pocket counter opening side 5
A preload Fao is applied to the inner rings 2 and 2 from b and 5b, and a preload is applied to the outer rings 3 and 3 from the cage pocket opening sides 5a and 5a. The method of applying this preload is not particularly limited and the design can be changed. Further, the preload amount is appropriately set as necessary / optimal amount and is not limited. Rolling ball bearing 1
Is an inner ring 2 having an inner ring raceway groove 2a on the outer circumference, an outer ring 3 having an outer raceway groove groove 3a on the inner circumference, and a plurality of rolling elements 4 incorporated between the inner ring raceway groove 2a and the outer ring raceway groove 3a.
A ball bearing composed of a crown-shaped cage 5 that holds the rolling elements 4 at equal intervals. Further, in order to improve the rocking resistance during transportation of the product, the grease G enclosed in the ball bearing 1 is groove-enclosed (enclosed in the inner ring raceway groove 2a and the outer ring raceway groove 3a). The crown-shaped cage 5 has, for example, an annular main portion 5c.
And a plurality of pockets 5d provided on one surface in the axial direction of the main portion 5c, and one surface (end surface) 5i opposite to the pockets 5d.
And a pocket 5d is provided between a pair of claws (also referred to as elastic pieces) 5e that are spaced apart from each other on one axial surface of the main portion 5c. The grease deposition supply unit 5h is provided on the end surface 5i located between the pockets 5d and 5d, and in the present embodiment, the end surface 5 extends from the cage outer diameter surface 5g to the inner diameter surface 5f.
It is formed with a notched shape which is trapezoidal in plan view and which is widened in the i direction. The grease accumulation supply unit 5h has a role of accumulating the grease G scraped off by the peripheral portion of the cage pocket and supplying an appropriate amount of grease from the notch. Further, in the present embodiment, S ≦ 20% when the cutout position is S and the ball diameter is Da with reference to the outer ring groove shoulder position of the grease accumulation supply unit 5h.
It was adjusted so as to satisfy the formula of × Da. By setting the notch position S to 20% or less of the ball diameter Da in this way, the torque becomes low and becomes a substantially constant value. The shape of the grease accumulation supply portion 5h is not particularly limited to the shape shown in the figure, and may be a notch formed in another shape in plan view. Further, as in the present embodiment, from the cage outer diameter surface 5g to the inner diameter. The shape is not limited to the length formed over the surface 5f, and may be a groove (not shown) cut out from the cage outer diameter surface 5g to a desired depth, and may be arbitrarily formed. is there. In the present embodiment, one grease accumulation supply unit 5h is provided at each end face 5i position between the pockets 5d and 5d, but a plurality of grease accumulation supply units 5h may be provided, or between each pocket 5d and 5d. Instead of this, one or more pockets may be provided between the pockets 5d and 5d at arbitrary intervals.

A sealing plate (a shield in this embodiment, but a contact or non-contact seal is also applicable) 9 is provided between the inner and outer rings 2 and 3 of each bearing 1 as required. . The configuration of the sealing plate 9 is not particularly limited and the design can be changed within the scope of the present invention. Although the rolling bearing 1 is not particularly limited and has a general structure, in the present embodiment, as described above, the cage pocket non-opening side 5 is used.
In the ball bearing in which a preload is applied to the inner ring 2 of b and the outer ring 3 of the cage pocket opening side 5a, the crown-shaped cage end surface 5i
There is a characteristic component in that the grease accumulation supply section 5h is provided in the above. Therefore, the structures of the inner ring 2, the outer ring 3, and the rolling elements 4 are not particularly limited to interpretation, and can be arbitrarily selected and changed, so detailed description will be omitted. In the bearing in which the crown-shaped cage 5 is thus incorporated, preload is applied to the inner ring end surfaces 2b, 2b located on the cage pocket non-opening sides 5b, 5b and the outer ring end surfaces 3b, 3b located on the cage pocket opening sides 5a, 5a. By applying, it becomes possible to design a bearing device with low torque and high rotation accuracy. That is, as shown in FIG. 2, the grease G filled in the groove collects on the anti-contact angle side, especially on the outer ring 3 side due to centrifugal force, but the grease G that collects on the anti-contact angle side of the outer ring 3 is Along with the rotation, it moves to the cage end surface 5i side parallel to the contact angle (movement direction is indicated by arrow A in the figure).
Then, it is scraped off near the cage end surface 5i. Then, the scraped grease G is deposited on the grease deposition supply section 5h provided on the end surface 5i, so that an appropriate amount of grease can be supplied. Further, the problem of dust generation can be solved by using a magnetic fluid seal or the like.

The second to nineteenth embodiments will be described below. The difference from the first embodiment is the bearing device form, and the characteristic point is that the cage 5 has a grease deposition supply section 5h. It is the same as the point that is provided. Therefore, only the different configuration will be described, and the description of the first embodiment will be referred to for other configuration and effect.

"Second Embodiment" A second embodiment is shown in FIG. In this embodiment, double-row raceway grooves 10a, 10a are provided on the inner circumference.
An outer ring 10 that surrounds the outer ring 10, and one raceway groove 10 of the outer ring 10.
A shaft 6 having a raceway groove 6a facing a on one side of the outer circumference.
A separate inner ring 2 fixed to the outer periphery of the shaft 6 with the raceway groove 2a facing the other raceway groove 10a of the outer ring 10, the raceway groove 10a of the outer ring 10 and the raceway groove 6a of the shaft 6. Between the other raceway groove 10a of the outer ring 10 and the raceway groove 2 of the inner ring 2
1 shows an embodiment of a bearing device constituted by a plurality of rolling elements (balls) 4, ... Then, in the present embodiment, the preload Fao is applied by pressing the left side of the shaft 6 in the figure and pressing the right end surface 2b of the right separate body ring 2. Therefore, this preload mode is a so-called O type. The crown-shaped cages 5 and 5 are installed so that the pocket opening sides 5a and 5a thereof face each other. In this way, the end faces 2b of the inner ring 2 are preloaded in a state in which the pocket opening sides 5a, 5a of the crown-shaped cages 5, 5 of both bearings are arranged to face each other (the pockets 5d are arranged inward so that they face each other). Fao
Is applied to the outer ring 1 as in the first embodiment described above.
Grease G collected on the side opposite to the contact angle of the groove 10a of 0 is caught in the ball 4 and moves in the rotation direction of the ball 4, and the grease G is scraped off by the crown-shaped cage 5 and scraped off. Accumulates in the grease accumulation supply unit 5h. The detailed configurations and operational effects of the respective components such as the inner ring 2, the rolling elements 4, the crown-shaped cage 5, etc. are the same as those in the above-described first embodiment, and will therefore be omitted.

"Third Embodiment" A third embodiment is shown in FIG. This embodiment is an example in which the shaft 6 has a stepped shape in the above-described second embodiment. The other configurations, the preload application method, and the operation and effect of this embodiment are the same as those of the second embodiment.

[Fourth Embodiment] FIG. 5 shows a fourth embodiment. In this embodiment, a stepped outer ring 10 in which a raceway groove 10a is provided on one of the inner circumferences, and one raceway groove 10 of the outer ring 10 are provided.
a stepped shaft 6 provided with a raceway groove 6a facing one side a on one side of the outer circumference, and a raceway groove 10a of the outer ring 10 and a raceway groove 6a of the shaft 6 with a corrugated cage 5 interposed therebetween. The rolling elements (balls) 4 and the outer ring 3 are separately fixed to the step portion of the outer ring 10, the inner ring 2 is fixed to the shaft 6, and the crown-shaped cage 5 is interposed between the outer ring 3 and the inner ring 2. It is constituted by a single ball bearing 1 incorporating a plurality of rolling elements 4. The detailed configuration of each component such as the inner ring 2, the outer ring 3, the rolling elements 4, the crown-shaped cage 5, the method of applying the preload, and the operation and effect of this embodiment are the same as those of the above-described embodiment.

"Fifth Embodiment" FIG. 6 shows a fifth embodiment. In the present embodiment, a shaft 6 having double-row raceway grooves 6a, 6a formed on the outer circumference, an outer ring 10 having a raceway groove 10a facing one of the raceway grooves 6a of the shaft 6 provided on one outer circumference, Axis 6
Between the outer race 3 of another body fixed to the outer circumference of the outer race 10 facing the other raceway groove 6a with the raceway groove 3a opposed thereto, and between the raceway groove 10a of the outer race 10 and the raceway groove 6a of the shaft 6 and the shaft. 6, a plurality of rolling elements (balls) 4 ..., 4 ... Incorporated between the other raceway groove 6a of 6 and the raceway groove 3a of the outer ring 3 via crown cages 5 and 5, respectively. . Then, in the present embodiment, the preload Fao is applied by pressing the left side of the outer ring 10 in the figure and pushing the right outer ring 3 separately.
Therefore, this form of preload is a so-called X-type preload.
The crown-shaped cages 5 and 5 have the pockets 5b and 5b opposite to the opening side thereof.
Installed in the direction in which they face each other. In this way, pressing the left side of the outer ring 10 and the separate outer ring 3 on the right side in a state in which the pocket opposite sides 5b, 5b of the crown type cages 5, 5 of both bearings are arranged to face each other. Preload F
When ao is applied, the grease G accumulated on the side of the groove 10a of the outer ring 10 opposite to the contact angle is caught in the ball 4 and moves in the rotation direction of the ball 4, and the grease G is scraped off by the crown-shaped cage 5. The scraped grease G is the grease accumulation supply section 5h.
Accumulate in. The detailed configuration of each component such as the outer ring 3, the rolling element 4, the crown-shaped cage 5, etc. is the same as that of the above-described embodiment.

"Sixth Embodiment" A sixth embodiment is shown in FIG. The present embodiment is an example in which the outer ring 10 has a stepped configuration in the fifth embodiment. Other configurations, the method of applying the preload, and the effects of the present embodiment are the same as those of the fifth embodiment.

"Seventh Embodiment" A seventh embodiment is shown in FIG. In this embodiment, a stepped outer ring 10 in which a raceway groove 10a is provided on one of the inner circumferences, and one raceway groove 10 of the outer ring 10 are provided.
a stepped shaft 6 provided with a raceway groove 6a facing one side a on one side of the outer circumference, and a raceway groove 10a of the outer ring 10 and a raceway groove 6a of the shaft 6 with a corrugated cage 5 interposed therebetween. The rolling elements (balls) 4 and the outer ring 10 are fixed to the step portion of the outer ring 10, the inner ring 2 is fixed to the shaft 6, and the plural cages 5 are interposed between the outer ring 3 and the inner ring 2. The rolling bearing 4 is incorporated into the ball bearing 1 as a single body, and the general structure is the same as that of the fourth embodiment described above. The sides 5b, 5b are arranged to face each other, and so-called X-type preload is applied (the preload method is the same as in the fifth embodiment). Therefore, the function and effect of this embodiment are the same as those of the fifth embodiment.

"Eighth Embodiment" An eighth embodiment is shown in FIG. In this embodiment, double-row raceway grooves 10a, 10a are provided on the inner circumference.
The outer ring 10 having the above-described structure, the straight shaft 6, and the raceway grooves 10a, 10a of the outer race 10 have the raceway grooves 2a, 2a.
So as to face each other, and separate inner rings 2 and 2 fixed to the outer periphery of the shaft 6 and raceway grooves 10a and 10a of the outer ring 10 thereof.
, A plurality of rolling elements 4, ..., Incorporated via crown-shaped cages 5, 5 between the inner races 2, 2 and the raceway grooves 2a, 2a, respectively.
4 ... Then, in the present embodiment, one inner ring 2 is pressed and the other inner ring 2 is pressed to apply a preload. Therefore, this preload mode is a so-called O type. The crown-shaped cages 5 and 5 have the pocket opening side 5a,
5a is assembled in a direction in which they face each other. The detailed configuration of each component such as the inner ring 2, the rolling elements 4, the crown-shaped cage 5, and the operation and effect of this embodiment are the same as those of the second embodiment.

[Ninth Embodiment] FIG. 10 shows a ninth embodiment. In the present embodiment, the shaft 6 having the double-row raceway grooves 6a, 6a formed on the outer circumference, the straight housing 14,
Separate outer rings 3 and 3 fixed to the inner circumference of the housing 14 so that the raceway grooves 3a and 3a face the raceway grooves 6a and 6a of the shaft 6, respectively, and the raceway grooves 6a and 6a of the shaft 6. 6a and the raceways 3a, 3a of the outer races 3, 3 are provided with a plurality of rolling elements 4 ...
It consists of ... Then, in the present embodiment, one outer ring 3 is pressed and the other outer ring 3 is pressed to apply a preload. Therefore, this preload mode is the so-called X type. The crown-shaped cages 5 and 5 have pockets 5b,
5b are assembled in a direction in which they face each other. Detailed structure of each component such as the outer ring 3, the rolling element 4, the crown-shaped cage 5, and the operation and effect of this embodiment are the same as those of the fifth embodiment.

The preload application method of the embodiment shown in FIGS. 3 to 10 will be additionally described. The shaft 6 and the inner ring 2, the outer ring 3 and the outer ring 10, or the outer ring 3 and the housing 14 are the inner diameter of the shaft 6 and the inner ring 2, or the outer ring 3 and the outer ring 10,
Alternatively, the following two methods can be applied between the outer ring 3 and the housing 14. A dead weight is placed over the gap, and a predetermined preload is applied and fixed by adhesion. By providing a interference and press fitting, rigidity is controlled by torque or resonance frequency, and a predetermined preload is applied.

[Tenth Embodiment] FIG. 11 shows a tenth embodiment. In the present embodiment, a shaft 6 directly provided with double-row raceway grooves 6a, 6a on the outer periphery, two outer rings 3, 3, and the raceway groove 6 are provided.
a, 6a and the outer ring raceway grooves 3a, 3a, a plurality of rolling elements 4, ...
And a spring 12 provided between the outer rings 3 and 3.
In the present embodiment, the spring 1 is arranged in the direction in which the outer rings 3 and 3 are separated from each other.
It is preloaded at 2 (forming a so-called O-type preload) and is installed in a direction in which the pocket opening sides 5a, 5a of the retainers 5, 5 face each other. In the figure, 9 is a sealing plate, 13
Indicates a spring seat. In this way, the double-bearing crown type cage 5,
Since a pre-load (O-type pre-load) is applied to the outer ring end faces 3b, 3b in a state in which the pocket opening sides 5a, 5a of 5 are arranged to face each other (the pockets 5d, 5d are arranged inward facing each other). As shown in FIG. 12, the grease G collected on the opposite contact angle side of the outer ring 3 is caught in the ball 4 and moves in the rotation direction of the ball 4, and the grease G is scraped off by the cage 5 and scraped off. The grease G accumulates in the grease accumulation supply section 5h of the cage 5 and becomes stable.

[Eleventh Embodiment] FIG. 1 shows an eleventh embodiment.
3 shows. In this embodiment, two ball bearings 1, 1 are mounted on the shaft 6.
The outer ring 3,3
The springs 12 are preloaded in the direction in which they are separated from each other. The so-called O-type preload is used, and the pocket opening sides 5a, 5a of the crown-shaped cages 5, 5 of both bearings are arranged so as to face each other (the pockets 5d, 5d are arranged so as to face each other). It has the same operation and effect as the tenth embodiment. In addition, in the present embodiment, the sealing plate 9 also serves as a spring seat to reduce cost and size, but a spring seat may be separately arranged. The bearing 1 is a ball bearing composed of the inner ring 2, the outer ring 3, the rolling elements 4, the crown-shaped cage 5, and the sealing plate 9, and is not particularly limited. In the figure, reference numeral 15 is a groove for adhesion.

[Twelfth Embodiment] FIG. 1 shows a twelfth embodiment.
4 shows. This embodiment is different from the eleventh embodiment in that two bearings 1 and 1 having different sizes are fixed to the shaft 6 by press fitting or adhesion, and the spring seat 13 is arranged in a direction in which the outer rings 3 and 3 are separated from each other. Is prestressed by the spring 12 via. Other configurations and operational effects are similar to those of the eleventh embodiment.

[Thirteenth Embodiment] FIG. 1 shows a thirteenth embodiment.
5 shows. In the present embodiment, unlike the twelfth embodiment, the sealing plate 9 also serves as a spring seat. In this case, since a separate spring seat is not required, the cost can be reduced. Other configurations / effects are similar to those of the twelfth embodiment.

[Fourteenth Embodiment] FIG. 1 shows a fourteenth embodiment.
6 shows. In this embodiment, a shaft 6 having double-row raceway grooves 6a, 6a formed on the outer circumference, a stepped housing 14, and separate outer rings 3, 3 fixed to the inner circumference of the housing 14,
Raceway grooves 3a, 3a of the outer rings 3, 3 and a raceway groove 6a of the shaft 6,
6a is formed by a plurality of rolling elements 4 ..., 4 ... Incorporated via crown-shaped cages 5, 5 while applying an X-type preload in a direction in which the lightly press-fitted outer rings 3, 3 come close to each other. The outer rings 3 and 3 are fixed to the housing 14 by adhesion. The crown-shaped cages 5 and 5 in both rows have the pockets 5b and 5b opposite the opening sides thereof.
They are arranged facing each other. in this way,
Pockets of crown-shaped cages 5 and 5 for both bearings
The outer rings 3 and 3 are arranged so that they are arranged so that they face each other.
Since the X-type preload is applied in the direction in which the two come close to each other, the grease G accumulated on the side of the outer ring 3 opposite to the contact angle is caught in the ball 4 and moves in the rotation direction of the ball 4, and the grease G retains the crown shape. The grease G scraped off by the container 5 is scraped off by the holder 5
The grease is accumulated in the grease accumulation supply unit 5h and is stable.

"Fifteenth Embodiment" FIG. 1 shows a fifteenth embodiment.
7 shows. The present embodiment is provided with a stepped housing 14,
A shaft 6 having a raceway groove 6a formed on one of the outer circumferences thereof, a separate outer ring 3 facing the raceway groove 6a and fixed to one inner circumference of the housing, a raceway groove 3a of the outer ring 3 and the shaft 6 Track groove 6
By a ball bearing 1 including a plurality of rolling elements 4 incorporated with a through a crown type cage 5, and an inner ring 2, an outer ring 3, rolling elements 4, a crown type cage 5, and a sealing plate 9. The outer races 3 and 3 are bonded and fixed to the housing 14 while applying an X-type preload in a direction in which the outer races 3 and 3 approach each other. The inner ring 2 is press-fitted or adhesively fixed. Both rows of crown-shaped cages 5, 5
Are arranged so that the pocket opposite sides 5b, 5b face each other. In this embodiment, a separate outer ring 3
Sealing plates (shields) 9 are disposed on both sides of the shaft 6 and the outer circumference of the shaft 6. The operation and effect of this embodiment are the same as those of the fourteenth embodiment.

[Sixteenth Embodiment] FIG. 1 shows a sixteenth embodiment.
8 shows. In the present embodiment, between the shaft 6 in which the raceway groove 6a is formed on one of the outer circumferences, the outer ring 3 arranged to face the one raceway groove 6a, and the raceway groove 6a and the raceway groove 3a of the outer ring 3. , A plurality of rolling elements 4 ... Incorporated via a crown type cage 5, an inner ring 2 and an outer ring 3, and a plurality of rolling elements 4 incorporated between the outer ring 3 and the inner ring 2 via a crown type cage 5. Rolling element 4 ...
And a ball bearing 1 provided by fixing the inner ring 2 to the shaft 6 and a spring 12 provided between the outer rings 3 and 3,
The spring 12 applies a preload in a direction in which the outer rings 3 and 3 are separated from each other. The inner ring 2 is press-fitted or adhesively fixed. The crown-shaped cages 5 and 5 are arranged inward with their pocket opening sides 5a and 5a facing each other. Other configurations and operational effects of this embodiment are the same as those of the tenth embodiment.

[Seventeenth Embodiment] FIG. 1 shows a seventeenth embodiment.
9 shows. In this embodiment, the shaft-shaped housing 6, the housing 14, the two inner rings 2 and 2, the outer rings 3 and 3, the inner ring raceway grooves 2a and 2a, and the outer ring raceway grooves 3a and 3a are provided with the crown-shaped cage 5 interposed therebetween. 4 and a spring 12 provided between the inner races 2, 2. In this embodiment, the inner rings 2 and 2 are preloaded by the spring 12 in the direction in which they are separated from each other (forming a so-called X-type preload), and the cages 5 and 5 are provided.
The pockets are installed in a direction in which the non-opening sides 5b, 5b face each other. Other functions and effects are the same as in the fifth embodiment.

[Eighteenth Embodiment] FIG. 2 shows the eighteenth embodiment.
It shows in 0. In the present embodiment, double-row raceway grooves 10a,
10a is provided around the outer ring 10, a raceway groove 6a facing one of the raceway grooves 10a of the outer ring 10 is provided around one of the outer circumferences, and a shaft 6 provided with a step 6b and the other of the outer race 10 are provided. A separate inner ring 2 fixed to the outer periphery of the shaft 6 with the raceway groove 2a facing the raceway groove 10a, and the raceway groove 10 of the outer ring 10 described above.
a and the raceway groove 6a of the shaft 6, and between the other raceway groove 10a of the outer ring 10 and the raceway groove 2a of the inner ring 2 through a coronal cage 5, 5, respectively. (Ball) 4
, 4, and a spring 12 provided between the inner ring 2 and the step portion 6b of the shaft, which are separate bodies. In this embodiment, the separate inner ring 2 and the stepped portion 6b of the shaft 6 are preloaded by the spring 12 (forming a so-called X-shaped preload), and the pockets 5b of the cages 5 and 5 opposite the opening side 5b. , 5b are installed so that they face each other. Other functions and effects are the same as in the fifth embodiment.

[Nineteenth Embodiment] In order to apply the preload Fao from the inner ring 2 on the opening side 5b of the cage pocket or the outer ring 3 on the opening side 5a of the cage, a crown shape is applied when the bearing 1 is assembled to the shaft 6. The mounting direction of the cage 5 must be known. Particularly, in the case where the sealing plate 9 is provided, it is difficult to determine the mounting direction of the crown-shaped cage 5 from the appearance. Therefore, as shown in FIG.
It is preferable to provide a mode (difference) between the one end surface 1a and the other end surface 1b (in the left-right direction of (a)) so that the mounting direction of the cage 5 can be easily discriminated from the appearance. In order to provide a difference between the both end surfaces 1a and 1b in this way, the following configuration can be given as a typical example. Such a retainer incorporation direction determination mode can be appropriately selected for all or any of the above-described first to eighteenth embodiments. Hereinafter, the configuration for discriminating the direction in which the cage is incorporated and its function and effect will be described.

For example, as shown in FIG. 21 (b), the inner ring 2
It is conceivable that marks 11 and 11 indicating the direction in which the cage is installed are provided only on one end surface 2b or 3b of one or both of the outer ring 3 and the outer ring 3. The marks 11 and 11 are attached to, for example, the bearing inner ring end surface 2c and the outer ring end surface 3b on the cage pocket opening side 5a. In this way, by attaching the marks 11 and 11 to the bearing inner ring end surface 2c and the outer ring end surface 3b on the cage pocket opening side 5a, the end surfaces with the marks 11 and 11 indicate the cage pocket opening side 5a. Therefore, the direction in which the cage is installed can be determined easily and instantly. Also, this mark 11
Contrary to the illustrated example, is the pocket 5 of the cage 5 opposite to the opening side 5b.
The bearing inner ring end surface 2b and the outer ring end surface 3c can be attached, and by doing so, it can be confirmed that the end surfaces of the marks 11, 11 are the pocket non-opening side 5b. As an example of the mark 11, an X mark is shown in FIG. 21, but this is merely an example and is not limited and can be arbitrarily selected. The mark 11 may be a separately formed one, may be directly engraved on the end face, may be provided in a planar shape or a protruding shape, and the number and position thereof are arbitrary. In addition, the mark 11 has one of the end faces 2
It is also possible to provide only in b etc. Furthermore, this mark 11 may be attached to the sealing plate 9 facing either the cage pocket opening side 5a or the counter opening side 5b, and the direction in which the cage is assembled can be instantly determined in the same manner as the above-mentioned configuration. Is.

Also, by changing the colors and materials of the sealing plates 9 and 9 to change the configurations of the sealing plates 9 and 9 on the one end side and the other end side of the bearing, the direction in which the crown-shaped cage 5 is assembled can be changed. It can also be made visually distinct. For example, the colors and patterns of both sealing plates 9 and 9 may be changed, or one sealing plate 9 may be made of synthetic resin or rubber and the other sealing plate 9 may be made of steel. In the case of synthetic resin, if a transparent material is used, the direction in which the crown-shaped cage 5 is assembled can be confirmed through the sealing plate. For example, as shown in the sixteenth embodiment (FIG. 18) described above, the shape of the sealing plate
It is also possible to make it possible to distinguish by changing the size. Further, when the ball bearing 1 is incorporated in the shaft 6 as shown in FIGS. 13, 14 and 15, for example, the sealing plates 9 are not attached to both ends of the bearing 1 as described above, but the sealing plates 9 are attached to the bearing end surface. If you attach it to only one of the
The direction in which the crown-shaped cage 5 is installed can be discriminated from the appearance. That is, if the sealing plate 9 is mounted only on the bearing end surface located on the pocket non-opening side 5b of the crown type cage 5 or the bearing end surface located on the pocket opening side 5a of the cage 5, if the sealing plate 9 mounting side is The cage pocket opening side 5a (or the cage non-opening side 5b) is provided, and the direction in which the crown-shaped cage 5 is assembled can be easily determined. Furthermore, it is possible to determine the direction in which the cage is installed by forming recesses and protrusions such as notches on the axial end edges of one or both of the inner ring 2 and the outer ring 3 to provide a difference. According to this, the HDD
The automatic machine for assembling can be configured so as to be assembled in a predetermined direction while determining the assembling direction of the retainer 5 based on the unevenness such as the notch.

In the manufacturing process of the rolling bearing with seal, it is possible to easily and surely make a difference between the both end faces depending on the direction in which the cage is assembled, without particularly troublesome work. In the case of the sealed ball bearings configured as described above, it is possible to easily and surely determine the cage mounting direction from the outside.Therefore, it is necessary to ensure that each bearing mounting direction is regulated according to the cage mounting direction. Can be done. If the above-described rolling bearing 1 configuration is adopted, various differences for the determination are made so that the direction in which the crown type retainer 5 is installed in the sealing plate 9 and the bearing rings (inner ring 2 and outer ring 3) of the bearing 1 can be determined from the appearance. Since the bearing is provided, the directionality of the crown-shaped cage 5 can be easily known from the external appearance even if the bearing has the sealing plates 9 mounted on both ends 1a and 1b. Therefore, since the preload Fao can be applied to the inner ring 2 on the cage pocket counter opening side 5b and the outer ring 3 on the cage pocket opening side 5a easily and reliably, the rotational torque, its fluctuation, and vibration not synchronized with the rotation are reduced. It becomes possible.

[0031]

EXAMPLE An experiment conducted to confirm the effect of the ball bearing of the present invention will be described. In the following experiments, the inner diameter is 5 mm,
A miniature ball bearing for an information device having an outer diameter of 13 mm and a width of 3 mm was incorporated in an HDD / SPM device (FIG. 22) and time-series changes in torque were compared. Here, the preload was applied to the inner ring 2 on the cage pocket non-opening side 5b and the outer ring 3 on the cage opening side 5a. Rotation speed: 120s ^-1 (7200rpm) (outer ring rotation) Preload: Axial load 11.76N (1.2k)
gf) Test time: 2 hr

Grease deposit supply section (notch) of the cage 5
An experiment was carried out to confirm the effect of the present invention with respect to the position h, and to determine the optimum position 5h of the grease deposition supply section (notch). Grease deposition supply unit 5 used in this experiment
The position S of h is shown in FIG. 2 in which a preload is applied to the inner ring 2 on the cage pocket non-opening side 5b and the outer ring 3 on the cage pocket opening side 5a. The position of the grease deposition supply section 5h on the side of the device end surface 5i is S. In this experiment, a bearing provided with a conventional cage without a grease accumulation supply section (notch) and a cage 5 provided with a grease accumulation supply section (notch) 5h were provided, and the position S was a ball diameter Da. 30%, 20%, 10%, 0% of
In the bearing of the present invention at -10%, each torque and NRRO were measured in time series, and the overall torque values were compared. The result is shown in FIG. FIG. 23
As shown in, when the claw height is 20% or less of the ball diameter, the torque is low and has a substantially constant value. On the other hand, when it is higher than 20%, the torque tends to increase. 24A shows the time-series change measurement result of torque at the notch position 20% of the grease accumulation supply unit 5h, FIG. 24B shows the time-series change measurement result of NRRO, and the grease accumulation supply unit (off). Fig. 25 shows the results of measurement of the time series change in torque without
(A), the time series change measurement result of NRRO is shown in FIG.
Shown in. From this result, the grease accumulation supply unit (notch)
In the cage 5 provided with 5h, both the torque and the NRRO have low values in a short time compared to the cage without the grease accumulation supply section (notch), and are stable thereafter. That is, in order to stabilize the torque and NRRO at low values, the cage end surface 5
It was experimentally confirmed that the grease accumulation supply unit (notch) 5h was provided on the i side, and the notch position S was 20% or less of the ball diameter. Furthermore, from the viewpoint of rigidity, it is set to 0% or less.
It is preferably 10% or more. In that case, it is also possible to secure rigidity by reducing the height of the cage.

[0033]

Since the present invention is configured as described above, it is possible to realize bearing specifications with low torque fluctuation, low torque, and low vibration.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing a first embodiment of the present invention.

FIG. 2A is an enlarged sectional view showing a part of FIG.
FIG. 2B is an enlarged plan view showing the retainer of FIG. 1 with a part thereof omitted.

FIG. 3 is a schematic sectional view showing a second embodiment of the bearing device of the present invention.

FIG. 4 is a schematic sectional view showing a third embodiment of the bearing device of the present invention.

FIG. 5 is a schematic sectional view showing a fourth embodiment of the bearing device of the present invention.

FIG. 6 is a schematic sectional view showing a fifth embodiment of the bearing device of the present invention.

FIG. 7 is a schematic sectional view showing a sixth embodiment of the bearing device of the present invention.

FIG. 8 is a schematic sectional view showing a seventh embodiment of the bearing device of the present invention.

FIG. 9 is a schematic sectional view showing an eighth embodiment of the bearing device of the present invention.

FIG. 10 is a schematic sectional view showing a ninth embodiment of the bearing device of the present invention.

FIG. 11 is a schematic sectional view showing a tenth embodiment of the bearing device of the present invention.

FIG. 12 is an enlarged cross-sectional view showing a part of FIG. 11 omitted.

FIG. 13 is a schematic sectional view showing an eleventh embodiment of the bearing device of the present invention.

FIG. 14 is a schematic sectional view showing a twelfth embodiment of the bearing device of the present invention.

FIG. 15 is a schematic sectional view showing a thirteenth embodiment of the bearing device of the present invention.

FIG. 16 is a schematic half sectional view showing a fourteenth embodiment of the bearing device of the present invention.

FIG. 17 is a schematic half sectional view showing a fifteenth embodiment of the bearing device of the present invention.

FIG. 18 is a schematic half sectional view showing a sixteenth embodiment of the bearing device of the present invention.

FIG. 19 is a schematic sectional view showing a seventeenth embodiment of the bearing device of the present invention.

FIG. 20 is a schematic sectional view showing an eighteenth embodiment of the bearing device of the present invention.

FIG. 21 is a schematic cross-sectional view showing a nineteenth embodiment of the bearing device of the present invention, in which a difference is provided so that the mounting direction of the cage can be discriminated, (a) is a schematic cross-sectional view, and (b) is a schematic view. Front view.

FIG. 22 is a schematic sectional view of an HDD / SPM device.

FIG. 23 is a diagram showing the results of an experiment conducted to confirm the effect of the present invention.

FIG. 24 shows experimental results of the HDD / SPM device of the present invention,
(A) is a figure which shows the time series change of torque, (b) is a figure which shows the time series change of NRRO.

FIG. 25 is an experimental result of a conventional HDD / SPM device,
(A) is a figure which shows the time series change of torque, (b) is a figure which shows the time series change of NRRO.

FIG. 26 is a schematic cross-sectional view showing a conventional bearing device.

FIG. 27 is an enlarged schematic view of a bearing device of the related art.

[Explanation of symbols]

1: Rolling ball bearing 2: Inner ring 2b: end surface of cage pocket opposite to the opening side 3: Outer ring 3b: Cage pocket opening side end surface 5: Crown type cage 5a: cage pocket opening side 5b: cage pocket non-opening side 6: Shaft 6b: Shaft step

Continued front page    F term (reference) 3J101 AA02 AA32 AA42 AA52 AA62                       BA25 CA11 EA63 FA35 FA41                       GA53

Claims (7)

[Claims] 1. A ball bearing in which a plurality of rolling elements are incorporated between an outer ring and an inner ring via a crown-shaped cage, and a preload is applied to the inner ring on the side opposite to the cage opening and the outer ring on the side closer to the cage opening. In the ball bearing, the grease accumulation supply section is provided on the end surface of the cage. 2. S ≦ 20, where S is the grease accumulation supply section position and Da is the ball diameter, based on the shoulder position of the outer ring groove.
The ball bearing according to claim 1, wherein the formula %% Da is satisfied. 3. The ball bearing according to claim 1, wherein a form is provided between one end face in the axial direction and the other end face in the axial direction so that the direction in which the retainer is assembled can be discriminated. . 4. A bearing device comprising the ball bearing according to any one of claims 1 to 3 incorporated therein. 5. An inner ring or shaft on the side opposite to the retainer side, and a retainer having a plurality of rolling elements mounted between the outer race and one of the inner race and the shaft through a crown type retainer. A bearing device in which a preload is applied to the outer ring on the opening side of the container, wherein a grease accumulation supply portion is provided on the end surface of the cage. 6. When the grease accumulation supply section position is S and the ball diameter is Da with reference to the groove shoulder position of the outer ring, S ≦ 2.
The bearing device according to claim 5, wherein the formula of 0% × Da is satisfied. 7. The bearing device according to claim 5, wherein a form is provided between one end face in the axial direction and the other end face in the axial direction so that the direction in which the cage is assembled can be determined. .