JP2000035045A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing for preventing the flowout or splash of lubricant adhering to an outer ring to maintain a proper lubricated condition for a long time, even the rolling bearing is used in outer or inner ring rotation conditions. SOLUTION: In this rolling bearing 10, since a pair of flanges 19 and 19 are hangingly provided on both the end parts of the inner peripheral surface 13 of an outer ring 11, the flowout of lubricant from the surface 13 of the wheel 11 due to centrifugal force can be eliminated even in the rotation of the ring 11, to surely prevent seizure between a ball 15 and the ring 11 and an inner ring 12. Also since the pair of flanges 19 and 19 are hangingly provided on both the end parts in the width direction of the surface 13, the lubricant, splashing from a retainer 18, etc., to the outer side in a radius direction, can be caught by the surface 13 between the flanges 19 and 19, to surely prevent the flowout and splash of the lubricant to outside the ring 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing incorporated in, for example, a hard disk drive (HDD), a machine tool or the like and used to support a rotating part of the machine. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing improved so as to prevent lubricant from flowing out of an outer ring due to centrifugal force acting on the rolling element, thereby preventing a rolling element from being in poor lubrication.

[0002]

2. Description of the Related Art Conventionally, various types of rolling bearings have been used to rotatably support a rotating shaft of a machine, for example. Among these rolling bearings, a single row of deep grooves shown in FIG. There are ball bearings. Fig. 7 shows the structure of this deep groove ball bearing.
With reference to FIG. 2, the inner race 2 of the outer race 1 and the outer race 4 of the inner race 3 which rotate relative to each other about the axis C are provided with orbits 6 and 7 for rolling a plurality of balls 5 respectively. ing.
Further, the balls 5 are held by a retainer 8 so as to be arranged at equal intervals in a circumferential direction.

The inner peripheral surface 2 and the raceway 6 of the outer race 1 and the outer peripheral surface 4 and the raceway 7 of the inner race 3 as well as the cage 8 are preliminarily coated with a lubricant or lubricated by an oil reservoir (not shown). The rolling of the ball 5 with respect to the outer ring 1 and the inner ring 3 is lubricated by gradually supplying the agent. There is also a bearing in which the cage 8 is impregnated with a lubricant in advance so that the lubricant always oozes out of the cage.

[0004]

When the above-described single row deep groove ball bearing is used in a state in which the outer ring is rotated, centrifugal force acts on the lubricant attached to the outer ring 1 with the rotation of the outer ring. Thereby, when the centrifugal force acting on the lubricant exceeds the adhesive force due to the viscosity of the lubricant, the lubricant is applied from both ends of the inner peripheral surface 2 of the outer ring 1 as shown by an arrow A in FIG. Spills and scatters slowly.

[0005] In an oil-plating type bearing in which a lubricant is applied in advance, if the lubricant applied first flows out or scatters completely, seizure may occur between the outer ring 1 and the ball 5. .
Similarly, in a bearing of a type in which lubricant is gradually supplied from an oil reservoir, the amount of lubricant consumed due to outflow, scattering, evaporation, and the like becomes larger than the amount of lubricant supplied from the oil reservoir. There is a possibility that seizure may occur between the outer ring 1 and the ball 5.

Further, in an angular ball bearing in which grease is previously sealed therein, when the bearing is used at a high speed, the clay of the grease decreases as the temperature of the bearing increases, and a counter provided on the inner surface of the outer ring on the opposite side of the load. Grease flows out or scatters from the bore. As a result, there arises a problem that seizure occurs between the outer race and the ball, and that the life is shortened due to poor lubrication.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and the lubricant attached to the outer ring flows out or scatters when the outer ring or the inner ring is used while rotating. An object of the present invention is to provide a rolling bearing that can prevent the rolling element from seizing.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rolling bearing having an outer ring and an inner ring which rotate relative to each other via a rolling element, in a radial direction beyond an inner peripheral surface of the outer ring facing the inner ring. This is achieved by a rolling bearing characterized in that the outer ring has at least one flange extending inward and continuing over the entire circumference. The flange is provided, for example, on the inner peripheral surface. In addition, a pair of the flanges are arranged so as to sandwich a track on which the rolling element formed on the inner peripheral surface of the outer ring rolls, for example. The flange extends from a side surface of the outer race, for example. Further, the flange is formed by, for example, inclining the inner peripheral surface so that the inner circumferential surface is radially outward toward the center in the width direction of the outer ring.

In the rolling bearing of the present invention, a centrifugal force acts on the lubricant attached to the inner peripheral surface of the outer ring as the outer ring rotates. Thus, the lubricant tends to flow out of the outer ring from the inner peripheral surface, but its movement is hindered by the flange provided on the outer ring. Therefore, according to the rolling bearing of the present invention, it is possible to prevent the lubricant from flowing out and scattering from the inner peripheral surface of the outer ring, and prevent seizure between the outer ring and the rolling element. Also, if the inner peripheral surface is formed so as to be more radially outward toward the center in the width direction of the outer ring, the lubricant adhering to the inner peripheral surface is formed at the center in the width direction of the outer ring with the rotation of the outer ring. As a result, the lubricant can be prevented from flowing out, and the lubricant can be concentrated on the track to improve the lubrication of the rolling elements. The rolling bearing of the present invention is applied to a radial type ball bearing or a cylindrical roller bearing.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a rolling bearing according to the present invention will be described below in detail with reference to FIGS.

First, a first embodiment of the present invention will be described.
FIG. 1 is a half sectional view showing a rolling bearing according to a first embodiment of the present invention. The rolling bearing 10 according to the first embodiment includes an outer ring 11 and an inner ring 12 that relatively rotate around a rotation axis C. A track 1 on which a plurality of balls 15 roll is provided on an inner peripheral surface 13 of the outer race 11 facing the inner race 12 and an outer peripheral surface 14 of the inner race 12 facing the outer race 11.
6 and 17 are respectively recessed. The balls 15 are held by a holder 18 so as to be arranged at equal intervals around the rotation axis C. Furthermore, the inner peripheral surface 13 and the track 16 of the outer ring 11 and the outer peripheral surface 14 and the track 1 of the inner ring 12
7, and a lubricant is applied to the retainer 18 in advance to lubricate the rolling of the ball 15 with respect to the outer ring 11 and the inner ring 12.

Next, the characteristic portion of the rolling bearing 10 according to the first embodiment will be described. Both ends of the inner peripheral surface 13 of the outer race 11 in the direction of the rotation axis C, that is, both ends of the inner peripheral surface 13 in the width direction are provided. Has a pair of flanges 19, 19 projecting radially inward with respect to the rotation axis C, and extending continuously over the entire circumference of the inner peripheral surface 13 in the circumferential direction.

Thus, even if the centrifugal force generated as the outer ring 11 rotates around the rotation axis C acts on the lubricant adhering to the inner peripheral surface 13, these lubricants are applied to the pair of flanges 19. , 19 over the outer ring 11. Therefore, the inner peripheral surface 13 and the track 16 are always kept in a state where the lubricant is attached. And
The lubricant adhering to the inner peripheral surface 13 and the raceway 16 adheres to the ball 15 and is supplied to the outer peripheral surface 14 of the inner race 12, the raceway 17 and the retainer 18. There is no burn-in.

Further, in the first embodiment, the pair of flanges 19, 19 are provided at both ends in the width direction of the inner peripheral surface 13, so that the lubricant scattered radially outward from the retainer 18 or the like can be prevented. , The inner peripheral surface 13 between the pair of flanges 19, 19
And the lubricant can be efficiently held inside the bearing.

Next, a second embodiment of the present invention will be described.
FIG. 2 is a half sectional view showing a rolling bearing according to a second embodiment of the present invention. The rolling bearing 20 according to the second embodiment includes an outer ring 21 and an inner ring 22 that relatively rotate around the rotation axis C. A track 2 on which a plurality of balls 25 roll is provided on an inner peripheral surface 23 of the outer race 21 facing the inner race 22 and an outer peripheral surface 24 of the inner race 22 facing the outer race 21.
6 and 27 are respectively recessed. The balls 25 are held by a holder 28 so as to be arranged at equal intervals around the rotation axis C. Furthermore, the inner peripheral surface 23 and the raceway 26 of the outer ring 21 and the outer peripheral surface 24 and the raceway 2 of the inner race 22
7, and a lubricant is applied to the cage 28 in advance to lubricate the rolling of the ball 25 with respect to the outer ring 21 and the inner ring 22.

Next, a characteristic portion of the rolling bearing 20 according to the second embodiment will be described.
Is the central part in the direction of the rotation axis C, that is, the inner peripheral surface 13.
The cross-sectional shape is curved so as to draw an arc shape such that the center portion in the width direction is more radially outward with respect to the rotation axis C.

As a result, in the rolling bearing 20 of the second embodiment, when the centrifugal force generated by the rotation of the outer ring 21 around the rotation axis C acts on the lubricant attached to the inner peripheral surface 23, Collects in the center of the outer ring 21 in the width direction, that is, the track 26. Thereby, the orbit 26
Is always kept in a state where the lubricant is adhered. Then, the lubricant adhered to the track 26 adheres to the ball 25 and
2 is supplied to the track 27 and the retainer 28 of the
No seizure occurs between the outer ring 5 and the outer ring 21 and the inner ring 22. Further, the lubricant is less likely to move to both ends in the width direction, and the lubricant can be efficiently held inside the bearing.

In the rolling bearing 20 according to the second embodiment, the inner peripheral surface 23 of the outer race 21 is formed in an arc-shaped cross section. It can also be formed from a pair of left and right tapered surfaces inclined.

Next, a third embodiment of the present invention will be described.
FIG. 3 is a half sectional view showing a rolling bearing according to a third embodiment of the present invention. The rolling bearing 30 according to the third embodiment includes an outer ring 31 and an inner ring 32 that relatively rotate around the rotation axis C. A track 3 on which a plurality of balls 35 roll is provided on an inner peripheral surface 33 of the outer race 31 facing the inner race 32 and an outer peripheral surface 34 of the inner race 32 facing the outer race 31.
6, 37 are respectively recessed. The balls 35 are held by a holder 38 so as to be arranged at equal intervals around the rotation axis C. Furthermore, the inner peripheral surface 33 and the track 36 of the outer ring 31 and the outer peripheral surface 34 and the track 3 of the inner ring 32
7, and a lubricant is applied to the retainer 38 in advance to lubricate the rolling of the ball 35 with respect to the outer ring 31 and the inner ring 32.

Next, the characteristic portion of the rolling bearing 30 according to the third embodiment will be described. Both ends of the inner peripheral surface 33 of the outer ring 31 in the direction of the rotation axis C, that is, both ends of the inner peripheral surface 33 in the width direction are provided. A pair of flanges 39, 39 protruding radially inward with respect to the rotation axis C and extending continuously over the entire circumference of the inner peripheral surface 33 in the circumferential direction are vertically provided, respectively. Also, the inner peripheral surface 33 of the outer ring 31
Is formed so as to be curved so that its cross-sectional shape draws an arc shape such that the center in the direction of the rotation axis C, that is, the center in the width direction of the inner peripheral surface 33 is radially outward with respect to the rotation axis C. ing.

Thus, in the rolling bearing 30 of the third embodiment, when the centrifugal force generated by the rotation of the outer ring 31 around the rotation axis C acts on the lubricant attached to the inner peripheral surface 33, These lubricants collect in the center of the outer ring 31 in the width direction, that is, the track 36. Thereby, the orbit 36
Is always kept in a state where the lubricant is adhered. Then, the lubricant attached to the track 36 is attached to the ball 35 and
2 is supplied to the track 37 and the retainer 38 of the
No seizure occurs between the outer ring 31 and the inner ring 32. Further, since the pair of flanges 39, 39 is vertically provided at both ends in the width direction of the inner peripheral surface 33, the lubricant scattered radially outward from the retainer 38 or the like is removed from the pair of flanges 3.
The lubricant is received by the inner peripheral surface 33 between the bearings 9 and 39, and the lubricant can be efficiently held inside the bearing.

Next, a fourth embodiment of the present invention will be described.
FIG. 4 is a half sectional view showing a rolling bearing according to a fourth embodiment of the present invention. The rolling bearing 40 of the fourth embodiment is the same as the rolling bearing 10 of the first embodiment described above.
Is a modified form. That is, in the rolling bearing 10 of the first embodiment, a pair of left and right flanges 1 is provided.
9 and 19 are provided directly on the inner peripheral surface 13 of the outer race 11 and extend linearly inward in the radial direction. On the other hand, in the rolling bearing 40 of the fourth embodiment, a pair of left and right flanges 49, 49 are continuously provided from the side surface 11a of the outer race 11 in an L-shaped cross section. And
Radially inner ends 49 of these flanges 49
a, 49a extend radially inward beyond the inner peripheral surface 13 of the outer ring 11.

That is, the flange provided on the outer race 11 is
The outer ring 1 does not necessarily need to be vertically provided on the inner peripheral surface 23.
It can be extended from one side surface 11a. Flange 4
With the provision of 9, 49, the lubricant can be held on the inner peripheral surface 13 of the outer race 11, and the outer race 11 and the inner race 12 can be retained.
Lubrication between the ball and the ball 15 can be kept good.
Therefore, seizure does not occur between the ball 15 and the outer ring 11 and the inner ring 12, and the lubricant can be efficiently held inside the bearing.

Next, a fifth embodiment of the present invention will be described.
FIG. 5 is a half sectional view showing a rolling bearing according to a fifth embodiment of the present invention. The rolling bearing 50 according to the fifth embodiment is a cylindrical roller bearing provided with an outer ring 51 and an inner ring 52 that relatively rotate around a rotation axis C. A raceway 56 on which a plurality of cylindrical rollers 55 rolls is formed in an inner peripheral surface 53 of the outer race 51 facing the outer peripheral surface 54 of the inner race 52. The cylindrical rollers 55 are held by a holder 58 so as to be arranged at equal intervals around the rotation axis C.
Further, the track 56 of the outer ring 51, the outer peripheral surface 54 of the inner ring 52, and the retainer 58 are coated with a lubricant in advance, and the outer ring 5
The rolling of the cylindrical roller 55 with respect to the inner ring 1 and the inner ring 52 is lubricated.

Next, the characteristic portion of the rolling bearing 50 of the fifth embodiment will be described. The radially outer end of the inner peripheral surface 53 projects radially inward with respect to the rotation axis C. In addition, a flange 59 that extends continuously over the entire circumference of the inner peripheral surface 53 in the circumferential direction is vertically provided. Thus, even if the centrifugal force generated by the rotation of the outer ring 51 around the rotation axis C acts on the lubricant attached to the inner peripheral surface 53, these lubricants pass over the flange 59 and form the outer ring 51. Cannot move outside. Therefore, the lubricant is reserved on the inner peripheral surface 53 of the outer ring 51. Then, the lubricant retained on the inner peripheral surface 53 is
1 and is attached to the cylindrical roller 55 and further supplied to the outer peripheral surface 54 of the inner ring 52 and the retainer 58, so that seizure may occur between the cylindrical roller 55 and the outer ring 51 and the inner ring 52. Absent. Further, the lubricant can be efficiently held inside the bearing.

Next, a sixth embodiment of the present invention will be described.
FIG. 6 is a half sectional view showing a rolling bearing according to a sixth embodiment of the present invention. The rolling bearing 60 according to the sixth embodiment is an angular ball bearing provided with an outer ring 61 and an inner ring 62 that relatively rotate around the rotation axis C. Further, of the outer ring 61,
On the inner peripheral surface 63 facing the outer peripheral surface 64 of the inner ring 62,
Tracks 66 and 67 on which a plurality of balls 65 roll are respectively provided in a recessed manner. The ball 65 is attached to the cage 6
8 so as to be arranged at equal intervals around the rotation axis C. Further, the inner peripheral surface 63 and the track 66 of the outer ring 61 and the outer peripheral surface 64 and the track 67 of the inner ring 62, and further, the cage 6
Grease 8 is applied in advance to lubricate the rolling of the ball 65 with respect to the outer ring 61 and the inner ring 62. A counter bore 71 is provided on the side of the outer ring 61 on which no load is applied.

Next, the characteristic portion of the rolling bearing 60 according to the sixth embodiment will be described. The inner peripheral surface 63 of the outer race 61 has an end face of the counter bore 71 radially inward with respect to the rotation axis C. A flange 69 that protrudes and extends continuously over the entire circumference of the inner peripheral surface 63 in the circumferential direction.
Is hanging. Thereby, the rotation axis C of the inner race 62 is
The grease adhering to the outer peripheral surface 64 reaches the inner peripheral surface 63 of the outer ring 61 due to the centrifugal force generated by the peripheral rotation. Even if the bearing temperature rises as the rotation speed increases and the viscosity of the grease decreases, the grease rides over the flange 69 provided in the counterbore 71 of the outer ring 61 and gets over the outer ring 6.
1 cannot move outside.

Therefore, even if the grease between the outer race 61 and the track 66 is almost depleted, the grease held in the counter bore 71 is supplied to the track 66.
The inner peripheral surface 63 and the track 66 are always kept in a state where grease is attached. Then, the grease adhering to the inner peripheral surface 63 and the raceway 66 adheres to the ball 65 and is supplied to the outer peripheral surface 64 of the inner race 62, the raceway 67, and the retainer 68. Since no burn-in occurs between them, high-speed rotation is possible.
Further, since the grease is held inside the bearing, the life can be extended.

In each of the above embodiments, the outer rings 11 and 12 are used.
Although the case where 1, 31, 51, and 61 rotate has been described, the same operation and effect can be obtained even when the inner rings 12, 22, 32, 52, and 62 rotate. Inner ring 12,2
When 2, 32, 52, and 62 rotate, the inner rings 12, 2
The lubricant adhering to the tracks 17, 27, 37, 67 or the inner surface 54 of the 2, 32, 52, 62, the balls 15, 25, 35, 65 or the cylindrical rollers 55, the retainers 18, 28, 38, 58, 68 is , The outer rings 11, 21, 31, 5 by centrifugal force
Reaching 1,61 orbits 16, 26, 36, 56, 66,
Furthermore, the inner peripheral surface 1 of the outer race 11, 21, 31, 41, 51, 61 from both ends in the axial direction of the tracks 16, 26, 36, 56, 66
3, 23, 33, 43, 53, 63. Inner peripheral surface 13 of outer ring 11, 21, 31, 41, 51, 61,
The lubricant scraped out by the lubricants 23, 33, 43, 53, and 63 also acts on the inner peripheral surfaces 13, 23, 33, and 4 by the action of gravity.
3, 53, 63, and moves downward to form outer rings 11, 21, 3
1, 41, 51, 61 inner peripheral surfaces 13, 23, 33, 4
3, 53 and 63 are uniformly supplied. Therefore, the balls 15, 25, 35, 65 or the cylindrical rollers 55 and the outer ring 1
1,21,31,51,61 and inner rings 12,22,3
No burn-in occurs between 2, 52 and 62.
Further, the lubricant can be efficiently held inside the bearing.

As described above, each embodiment of the rolling bearing according to the present invention has been described in detail. However, it is needless to say that the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, in the above-described embodiment, a single-row deep groove ball bearing, a cylindrical roller bearing, and an angular ball bearing are described as examples. However, the present invention can be applied to a double-row deep groove ball bearing. Further, in the above-described embodiment, oil plating lubrication and grease lubrication have been described as examples, but the present invention can also be applied to a method of lubricating using both oil plating and grease.

[0031]

As is apparent from the above description, the rolling bearing of the present invention is provided with a flange extending radially inward beyond the inner peripheral surface of the outer ring. Even if the centrifugal force caused by this acts on the lubricant attached to the inner peripheral surface of the outer ring, these lubricants do not flow out and scatter from the inner peripheral surface to the outside of the outer ring. Therefore,
According to the rolling bearing of the present invention, it is possible to prevent the lubricant from flowing out and scattering from the inner peripheral surface of the outer ring, and to prevent seizure between the outer ring and the rolling element. In addition, the inner peripheral surface,
By forming the outer ring in such a manner as to be inclined radially outward toward the center in the width direction of the outer ring, the lubricant attached to the inner peripheral surface collects at the center in the width direction of the outer ring as the outer ring rotates. As a result, the outflow of the lubricant can be prevented, and the lubricant can be concentrated on the raceway, so that the lubrication between the outer ring and the rolling elements can be further improved.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a rolling bearing according to a first embodiment of the present invention.

FIG. 2 is a half sectional view showing a rolling bearing according to a second embodiment of the present invention.

FIG. 3 is a half sectional view showing a rolling bearing according to a third embodiment of the present invention.

FIG. 4 is a half sectional view showing a rolling bearing according to a fourth embodiment of the present invention.

FIG. 5 is a half sectional view showing a rolling bearing according to a fifth embodiment of the present invention.

FIG. 6 is a half sectional view showing a rolling bearing according to a sixth embodiment of the present invention.

FIG. 7 is a half sectional view showing a conventional rolling bearing.

[Explanation of symbols]

 C Rotation axis 1 Outer ring 2 Inner surface 3 Inner ring 4 Outer surface 5 Ball (rolling element) 6,7 Track 8 Cage 10 Rolling bearing of first embodiment 11 Outer ring 12 Inner ring 13 Inner surface 14 Outer surface 15 Ball (rolling) Moving body) 16 Track 17 Track 18 Cage 19 Flange 20 Rolling bearing of second embodiment 21 Outer ring 22 Inner ring 23 Inner peripheral surface 24 Outer peripheral surface 25 Ball (rolling element) 26 Track 27 Track 28 Cage 29 Flange 30 Third embodiment Rolling bearing 31 Outer ring 32 Inner ring 33 Inner peripheral surface 34 Outer peripheral surface 35 Ball (rolling element) 36 Track 37 Track 38 Cage 39 Flange 40 Rolling bearing 49 Fourth embodiment 49 Flange 50 Rolling bearing 51 Fifth embodiment 51 Outer ring 52 Inner ring 53 Inner peripheral surface 54 Outer peripheral surface 55 Cylindrical roller (rolling element) 56 Track 58 Cage 59 Flange 60 6 embodiment of the rolling bearing 61 the outer ring 62 within the inner ring 63 peripheral surface 64 outer circumferential surface 65 ball (rolling elements) 66 trajectory 67 trajectory 68 cage 69 flange 71 counterbore

Claims (1)

[Claims] 1. A rolling bearing having an outer ring and an inner ring which rotate relative to each other via a rolling element, wherein the rolling element extends radially inward beyond an inner peripheral surface of the outer ring facing the inner ring and extends over the entire circumference in the circumferential direction. A rolling bearing, wherein the outer race has at least one continuous flange.