JP2014111954A - Rolling bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing device which shortens the time for lubricant running-in operation without causing problems.SOLUTION: A rolling bearing device includes: an inner race 11; an outer race 20; a rolling element 28; a holder 30; and a seal member 40. A cylindrical protruding part 50 which is inserted into an annular space formed between an outer peripheral surface of the inner race 11 and an inner peripheral surface of the holder 30 and inhibits lubricant flow against the annular space is formed at the inner side of the seal member 40. Lubricant passages 35, 39, in which the lubricant may pass from the outer peripheral surface side of the inner race 11 to the inner peripheral surface side of the outer race 20, are formed between the holder 30 and the rolling element 28 or at a part of the holder 30.

Description

  The present invention relates to a rolling bearing device.

Conventionally, in a rolling bearing device, for example, as disclosed in Patent Document 1, an inner ring, an outer ring, and a plurality of rolling elements arranged to be able to roll in an annular space between the inner and outer rings, There has been known one provided with a cage for holding the plurality of rolling elements and a seal member disposed in an opening of an annular space between an inner ring and an outer ring.
Further, in the rolling bearing device, in order to familiarize the lubricant (mainly grease) with respect to the inner ring raceway surface of the inner ring, the outer ring raceway surface of the outer ring, the plurality of rolling elements and the cage, the lubricant conforming operation is performed.
The familiar operation of the rolling bearing device is performed by injecting a lubricant into the inner peripheral surface of the inner ring and then rotating the inner ring.
At this time, the lubricant on the inner peripheral surface side of the inner ring is agitated and the gap between the axial end surface of the cage and the seal member passes through the annular gap between the outer peripheral surface of the inner ring and the inner peripheral surface of the cage. Flows to the inner peripheral surface side of the outer ring. Then, excess lubricant accumulates on the inner peripheral surface side of the outer ring and constitutes a lubricant reservoir.

JP 2008-261416 A

By the way, in the rolling bearing device disclosed in Patent Document 1, the lubricant on the outer peripheral surface side of the inner ring is caused by the rotation of the inner ring during the familiar operation of the lubricant. It flows to the inner peripheral surface side of the outer ring through the gap between the axial end face of the cage and the seal member via the annular gap between the outer face and the face.
For this reason, for example, when the cage is made of resin and the axial thickness of the cage is large, an annular gap between the outer circumferential surface of the inner ring and the outer circumferential surface of the inner ring and the inner circumferential surface of the cage And the flow distance of the lubricant until it passes through the gap between the axial end surface of the cage and the seal member becomes long.
As a result, it is assumed that the time for the running-in of the lubricant becomes longer and the temperature rise of the lubricant becomes significant.

  In view of the above problems, an object of the present invention is to provide a rolling bearing device that can favorably shorten the time required for the operation of a lubricant.

In order to solve the above problems, a rolling bearing device according to a first aspect of the present invention includes an inner ring disposed on the rotating shaft side, an outer ring disposed on the housing side, and between the inner ring and the outer ring. A rolling bearing device comprising: a plurality of rolling elements that are rotatably disposed in the annular space; a cage that holds the plurality of rolling elements; and a seal member that is disposed in an opening of the annular space. Because
Inside the seal member, a cylindrical protrusion is formed that is inserted into an annular gap between the outer circumferential surface of the inner ring and the inner circumferential surface of the cage, and suppresses the flow of lubricant to the annular gap.
A lubricant passage through which lubricant can pass from the outer peripheral surface of the inner ring toward the inner peripheral surface of the outer ring is formed between the retainer and the rolling element or in a part of the retainer. It is characterized by that.

According to the above configuration, the lubricant on the outer peripheral surface side of the inner ring flows through the annular clearance between the outer peripheral surface of the inner ring and the inner peripheral surface of the cage as the inner ring rotates during the familiar operation of the lubricant. Try to. At this time, the flow of the lubricant is suppressed by the cylindrical protrusion of the seal member.
Then, the lubricant reaches the inner peripheral surface side of the outer ring through the lubricant passage formed between the cage and the rolling element or part of the cage.
For this reason, the flow distance of the lubricant from the inner peripheral surface side of the inner ring to the inner peripheral surface side of the outer ring through the lubricant passage is from the outer peripheral surface side of the conventional inner ring to the outer peripheral surface of the inner ring and the cage. It can be made shorter than the flow distance of the lubricant through the annular clearance between the inner peripheral surface and the clearance between the axial end surface of the cage and the seal member and reaching the inner peripheral surface of the outer ring.
As a result, it is possible to satisfactorily shorten the time for the familiar operation of the lubricant and to suppress a rise in the temperature of the lubricant.
Further, even when the cage is made of resin and the axial thickness of the cage is large, the flow distance of the lubricant can be shortened regardless of the axial thickness of the cage.

The rolling bearing device according to claim 2 is the rolling bearing device according to claim 1,
An inclined guide surface that guides the lubricant on the outer peripheral surface side of the inner ring to the lubricant passage is formed at the tip of the cylindrical protrusion.

  According to the above configuration, the lubricant on the outer peripheral surface side of the inner ring is guided to the lubricant passage by the inclined guide surface formed at the tip of the cylindrical protrusion of the seal member, and the flow of the lubricant becomes smooth. As a result, it is possible to further reduce the time required for the operation of the lubricant and to further reduce the increase in the temperature of the lubricant.

It is a longitudinal cross-sectional view which shows the rolling bearing apparatus which concerns on Example 1 of this invention. It is the longitudinal cross-sectional view which similarly expands and shows the principal part. It is a perspective view which similarly shows a holder | retainer. It is a longitudinal cross-sectional view which shows the embodiment by which the through-hole which comprises a lubricant channel was formed in a part of cage.

  A mode for carrying out the present invention will be described in accordance with an embodiment.

A first embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the rolling bearing device includes a rolling bearing 10 (angular ball bearing in the first embodiment) and a seal member 40.
The rolling bearing 10 includes an inner ring 11, an outer ring 20, a plurality of rolling elements 28 (balls in this embodiment 1), and a cage 30.

The inner ring 11 is formed in a cylindrical shape, and its central hole is fitted (press-fitted) to the outer peripheral surface of the rotary shaft 1 (for example, a spindle of a machine tool) so as to be integrally rotatable.
As shown in FIG. 2, an inner ring raceway surface 12 is formed on the outer peripheral surface of the inner ring 11 at a substantially central portion in the axial direction, and track shoulder portions 13 and 14 are formed on both sides of the inner ring raceway surface 12. Yes. In the first embodiment, of the both shoulders 13 and 14, the diameter of the outer peripheral surface of the track shoulder 14 positioned on the left side in FIG. 2 is the diameter of the outer peripheral surface of the track shoulder 13 positioned on the right side. The shoulder surface is formed smaller than the dimension by a set dimension. Further, on the outer side of the track shoulder 13 located on the right side, a shoulder dropping surface 13a having an outer diameter that is equivalent to the outer diameter of the track shoulder 14 that has been dropped is formed in a step shape.
Moreover, the annular groove 16 which comprises the sealing member 40 mentioned later and a labyrinth (non-contact sealing part) is formed in the both ends of the outer peripheral surface of the inner ring | wheel 11, respectively.

As shown in FIG. 1, the outer ring 20 is formed in a cylindrical shape disposed on the same center line with an annular space between the outer ring 20 and the outer ring surface of the inner ring 11, and the outer ring surface is fitted to the housing 2. It is arranged in a fixed state.
As shown in FIG. 2, an outer ring raceway surface 21 is formed on the inner peripheral surface of the outer ring 20 at a substantially central portion in the axial direction, and track shoulders 22 and 23 are formed on both sides of the outer ring raceway surface 21. ing. In the first embodiment, the radial dimension of the inner peripheral surface of the right track shoulder 22 is smaller than the radial dimension of the inner peripheral surface of the left track shoulder 23 of both the track shoulders 22 and 23. . Also, cage guide surfaces 22a and 23a are respectively formed on the outer side portions of both the track shoulder portions 22 and 23 so as to protrude radially inward with the same inner diameter.
Further, annular grooves 24 for fixing a seal member 40 to be described later are formed at both ends of the inner peripheral surface of the outer ring 20.
The plurality of rolling elements 28 are disposed between the inner ring raceway surface 12 and the outer ring raceway surface 21 so as to be able to roll while being held by a cage 30.

The cage 30 is formed of a resin material having heat resistance and wear resistance, and is arranged in a cylindrical shape along the annular space between the inner ring 11 and the outer ring 20 as shown in FIGS. It is installed.
Lubricant passages 35 and 39 through which the lubricant can pass from the outer peripheral surface of the inner ring 11 toward the inner peripheral surface of the outer ring 20 are formed between the cage 30 and the rolling element 28 or a part of the cage 30. Has been.

In the first embodiment, as shown in FIG. 3, the resin-made cage 30 includes a first pocket 32 that holds a rolling element 28 at a set interval in the circumferential direction, and a second pocket. 36 are formed. The first pocket 32 has a first guide hole 33 and a first space forming hole 34 in communication.
The first guide hole portion 33 is formed on one end side in the axial direction of the first pocket 32, and the hole wall surface 33a is in sliding contact with the outer peripheral surface of the rolling element 28 to suppress movement in both one axial direction and the circumferential direction. To do.
The first space constituting hole 34 is formed on the other end side in the axial direction of the first pocket 32, and a gap allowing the passage of the lubricant between the hole wall surface 34 a and the outer peripheral surface of the rolling element 28 is formed. This gap is used as a lubricant passage 35.

The second pocket 36 has a second guide hole 37 and a second space forming hole 38 in communication.
The second guide hole portion 37 is formed on the other end side in the axial direction of the second pocket 36, and the hole wall surface 37a is in sliding contact with the outer peripheral surface of the rolling element 28 to move both in the other axial direction and in the circumferential direction. Suppress.
The second space constituting hole 38 is formed on one end side in the axial direction of the second pocket 36, and the hole wall surface 38 a is separated from the outer peripheral surface of the rolling element 28 with a gap allowing the lubricant to pass therethrough. The gap is used as a lubricant passage 39.

In the first embodiment, when the number of the plurality of rolling elements 28 is set to an even number, the same number of first pockets 32 and second pockets 36 are arranged in the circumferential direction of the cage body 31. It is preferable.
Further, when the number of the plurality of rolling elements 28 is an even number or an odd number, a plurality of first pockets 32 and a plurality of second pockets 36 may be alternately arranged in the circumferential direction of the cage body 31. Even more preferred.
The first and second guide hole portions 33 and 37 are preferably formed in a semicircular arc shape having a radius slightly larger than the radius of the rolling element 28. Furthermore, it is preferable that the semicircular arc-shaped first and second guide holes 33 and 37 are formed with high accuracy by drilling or reaming.

As shown in FIG. 2, the seal member 40 includes a cored bar 41 and an elastic body 45. The cored bar 41 has an outer diameter cylindrical portion 42 formed to have an outer diameter dimension that can be fitted into an end portion of the inner peripheral surface of the outer ring 20, and extends radially inward from the end portion of the outer diameter cylindrical portion 42. An annular portion 43 bent at a right angle and an inner diameter cylindrical portion 44 bent in a cylindrical shape in the axial direction from the inner diameter end of the annular portion 43 toward the rolling element 28 are provided.
A covering portion 46 made of an elastic body 45 is formed on the outer surface of the annular portion 43 of the core metal 41, and the outer peripheral surface of the cylindrical portion 42 of the core metal 41 is elastically compressed and fitted into the annular groove 24 of the outer ring 20. A fixing portion 47 made of an elastic body 45 fixed by being inserted is formed.
Further, a labyrinth (non-contact seal portion) is provided in a bent portion between the annular portion 43 and the inner diameter cylindrical portion 44 of the core metal 41 with a slight gap between the annular groove 16 of the inner ring 11 and in cooperation with the annular groove 16. A sealing portion 48 is formed.

A cylindrical protrusion 50 is formed on the inner side of the seal member 40 so as to be inserted into an annular gap between the outer peripheral surface of the inner ring 11 and the inner peripheral surface of the cage 30 to suppress the flow of the lubricant with respect to the annular gap. Yes.
In the first embodiment, the cylindrical protrusion 50 is integrally formed with the inner diameter cylindrical portion 44 of the core metal 41 and the elastic body 45 so as to be reinforced by the inner diameter cylindrical portion 44 and to cover the inner diameter cylindrical portion 44. And an elastic body portion 50a.
In addition, an inclined guide surface 51 that guides the lubricant on the outer peripheral surface (inner ring raceway surface 12) side of the inner ring 11 to the lubricant passage 35 or 39 is formed at the tip of the elastic body portion 50a of the cylindrical protrusion 50. ing.

The rolling bearing device according to the first embodiment is configured as described above.
Therefore, in the case of performing the running-in operation of the lubricant of the rolling bearing device, it is performed after the lubricant (mainly grease) is injected into the inner ring raceway surface 12 side of the inner ring 11 in advance.
During the familiar operation of the lubricant, the inner ring 11 is rotated, and with the rotation of the inner ring 11, the lubricant on the inner ring raceway surface 12 side flows in the direction of the arrow in FIG.
That is, when the lubricant on the inner ring raceway surface 12 side tries to flow through an annular gap between the outer peripheral surface of the inner ring 11 and the inner peripheral surface of the cage 30, the lubricant flows to the cylindrical protruding portion of the seal member 40. 50.
For this reason, the lubricant reaches the inner peripheral surface side of the outer ring 20 through the lubricant passages 35 and 39 between the cage 30 and the rolling elements 28.

The flow distance of lubricant from the inner ring raceway surface 12 side of the inner ring 11 to the inner peripheral surface side of the outer ring 20 through the lubricant passages 35 and 39 is from the outer peripheral surface side of the conventional inner ring to the outer peripheral surface of the inner ring. Shorter than the flow distance of the lubricant through the annular clearance between the inner peripheral surface of the cage and the clearance between the axial end surface of the cage and the seal member and reaching the inner peripheral surface of the outer ring. I can.
As a result, it is possible to satisfactorily shorten the time for the familiar operation of the lubricant and to suppress a rise in the temperature of the lubricant.
Further, even when the cage 30 is made of resin and the axial thickness of the cage 30 is large, unlike the conventional case, the flow distance of the lubricant is not affected by the axial thickness of the cage 30. Can be shorter.
Excess lubricant accumulates on the inner peripheral surface side of the outer ring 20 and constitutes a lubricant reservoir. Thereby, the familiar operation of the lubricant of the rolling bearing device is completed.

  In the first embodiment, the lubricant on the inner ring raceway surface 12 side of the inner ring 11 is transferred to the lubricant passages 35 and 39 by the inclined guide surface 51 formed at the tip of the cylindrical protrusion 50 of the seal member 40. Guided and smooth lubricant flow. As a result, it is possible to further reduce the time required for the operation of the lubricant and to further reduce the increase in the temperature of the lubricant.

In addition, this invention is not limited to the said Example 1, In the range which does not deviate from the summary of this invention, it can implement with a various form.
For example, in the first embodiment, the lubricant passages 35 and 39 between the retainer 30 and the rolling element 28 are formed. For example, as shown in FIG. 4, the retainer 130 itself penetrates in the radial direction. A plurality of through holes 135a and 139a may be formed, and these through holes 135a and 139a may be used as the lubricant passages 135 and 139.

DESCRIPTION OF SYMBOLS 11 Inner ring 12 Inner ring raceway surface 20 Outer ring 21 Outer ring raceway surface 30 Cage 32 1st pocket 33 1st guide hole part 34 1st space structure hole part 35 Lubricant passage 36 2nd pocket 37 2nd guide hole part 38 2nd space Constituent hole 39 Lubricant passage 40 Seal member 50 Cylindrical protrusion 51 Guide surface

Claims (2)

An inner ring disposed on the rotating shaft side, an outer ring disposed on the housing side, a plurality of rolling elements disposed in an annular space between the inner ring and the outer ring, and a plurality of these rolling elements A rolling bearing device comprising a cage for holding a rolling element and a seal member disposed in an opening of the annular space,
Inside the seal member, a cylindrical protrusion is formed that is inserted into an annular gap between the outer circumferential surface of the inner ring and the inner circumferential surface of the cage, and suppresses the flow of lubricant to the annular gap.
A lubricant passage through which lubricant can pass from the outer peripheral surface of the inner ring toward the inner peripheral surface of the outer ring is formed between the retainer and the rolling element or in a part of the retainer. A rolling bearing device characterized by that. The rolling bearing device according to claim 1,
A rolling bearing device characterized in that an inclined guide surface that guides the lubricant present on the outer peripheral surface side of the inner ring to the lubricant passage is formed at the tip of the cylindrical protrusion.

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