JP2004324809A - Rolling bearing device and lubricating method for it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing device for supporting the drive shaft of a machine tool etc. of such a structure that the air for feeding the lubricating oil into the bearing may be supplied intermittently, whereby it is possible to suppress the rise of the cost associated with the drive of a driver device for supplying the air. <P>SOLUTION: The rolling bearing device is configured so that a holding groove 23 is formed at an inner ring member 4 stretching in its circumferential direction, a third oil feeding hole 25 to put the groove 23 in communication with openings formed at certain intervals in the circumferential direction is formed in the neighborhood of the inner ring raceway 6, and that the groove 23 is furnished with a holding member 31 to hold the lubricating oil 30 in such an arrangement that the oil 30 is fed toward the openings. Accordingly the required amount of lubricating oil 30 is fed by the centrifugal force acting round the axis of the inner ring member 4 into the bearing from the third oil feeding hole 25 so as to lubricate the inside of the bearing, so that the rise of the agitating resistance of balls 8 can be suppressed, and it is possible to suppress the rise of the operating cost because the air for feeding the lubricating oil 30 may be supplied intermittently. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rolling bearing device used for, for example, a main shaft of a machine tool and a lubrication method for the rolling bearing device.
[0002]
[Prior art]
BACKGROUND ART In a rolling bearing device used for a main shaft or the like of a machine tool, there is an oil lubrication type device that lubricates the inside of a bearing by injecting or spraying a lubricating oil between an inner ring member and an outer ring member (for example, And Patent Document 1).
[0003]
In this rolling bearing device, an annular groove is formed on an end surface of an inner ring member, and a lubrication heading toward a rolling element is formed by communicating a bottom portion of the annular groove with each of a plurality of openings formed at intervals in a circumferential direction of an inner ring raceway surface. And a hole. Further, a relief portion is provided on the peripheral edge of the opening to form a clearance for releasing the lubricating oil between the opening and the rolling element passing through the opening.
[0004]
In the lubricating operation of the above-mentioned conventional rolling bearing device, the air flow containing the lubricating oil jetted from the nozzle into the annular groove toward the bottom is blown toward the rolling element through an oil supply hole opened at the bottom.
[0005]
[Patent Document 1]
JP-A-11-182560 (FIG. 1)
[0006]
[Problems to be solved by the invention]
In general, in this type of rolling bearing device, if the amount of the lubricating oil is too large, the stirring resistance when the rolling element rolls becomes large, and if the amount is too small, the lubricating property becomes insufficient. However, it is difficult to supply the required amount of lubricating oil to the inside of the bearing at a good timing. Therefore, an excessive amount of airflow including the lubricating oil is supplied from the nozzle.
[0007]
[Means for Solving the Problems]
The rolling bearing device of the present invention is an inner ring member through which a shaft is inserted and rotatably supported around the axis, an outer ring member concentrically arranged with the inner ring member, and an inner ring raceway surface of the inner ring member. And a plurality of rolling elements rotatably arranged between the outer raceway surfaces of the outer race member, and a holding groove formed in an axial end surface of the inner race member along a circumferential direction of the inner race member, An oil supply hole is formed in the inner ring member for communicating the holding groove and the opening formed at a predetermined position in the vicinity of the inner ring raceway surface or in the vicinity thereof, and the lubricating oil is held in the holding groove by holding the lubricating oil. A holding member is provided on the inner race member so as to rotate integrally with the inner ring member so as to be supplied toward the opening.
[0008]
The lubricating method of the rolling bearing device having the above-described configuration is configured such that the lubricating oil is held by the lubricating oil holding member provided on the inner ring member that is rotatable about the axis, and the lubricating oil is forcibly supplied to the lubricating oil holding member at predetermined time intervals. At the same time, the lubricating oil is supplied toward an opening formed at a predetermined position near the inner raceway surface of the inner race member or in the vicinity thereof by centrifugal force generated by the operation of rotating the inner race member around the axis.
[0009]
The lubricating oil held by the lubricating oil holding member is supplied from the holding member to the lubrication hole by a necessary amount according to the rotation speed of the inner ring member around the axis, that is, the strength of the centrifugal force, and is supplied from the lubrication hole to the inside of the bearing. The lubrication is performed to lubricate the rolling elements, so that an increase in agitating resistance when the rolling elements roll can be suppressed.
[0010]
Further, since the lubricating oil is held by the holding member, it is not necessary to constantly generate air for supplying the lubricating oil to the inside of the bearing. The increase in cost can be suppressed.
[0011]
In the above-mentioned rolling bearing device, between the rolling element side opening of the oil supply hole and the rolling surface of the rolling element, an annular groove is formed along the peripheral portion of the inner raceway surface so as to avoid the inner raceway surface. According to this, the lubricating oil that has reached the supply hole easily enters the groove having an area larger than the opening area of the supply hole, and lubricates the inside of the bearing.
[0012]
Preferably, the holding member is made of a porous material such as a sintered material or a phenol resin.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a rolling bearing device according to an embodiment of the present invention will be described with reference to the drawings, taking an angular ball bearing as an example. FIG. 1 is a sectional view showing a state in which a rolling bearing device of the present invention is mounted on a machine tool, FIG. 2 is a single sectional view showing the entire configuration of the rolling bearing device, FIG. 3 is an enlarged sectional view showing a using state, and FIG. It is a partially enlarged front view of a bearing device.
[0014]
As shown in FIG. 1, a rolling bearing device 1 according to this embodiment is of an oil lubrication type, and has a predetermined axial spacing in an annular space between a housing 2 of a machine tool and a drive shaft (shaft) 3. Are arranged in pairs. In addition, since the structure of these rolling bearing devices 1 is a left-right symmetrical shape, only the structure of one rolling bearing device 1 is shown in FIGS.
[0015]
The rolling bearing device 1 includes an inner race member 4 into which the drive shaft 3 is press-fitted, an outer race member 5 disposed concentrically with the inner race member 4 and press-fit into the housing 2, and, as shown in FIG. A plurality of balls (rolling elements) 8 which are rotatably arranged between an inner raceway surface 6 formed on the outer peripheral surface and an outer raceway surface 7 formed on the inner peripheral surface of the outer race member 5; And a retainer 9 for holding the same at circumferentially equal positions.
[0016]
As shown in FIG. 1, an outer race spacer 10 is arranged between the outer race members 5, and an inner race spacer 11 is arranged between the inner race members 4. The outer ring members 5 of each rolling bearing device 1 are sandwiched between a pair of spacers 12 in the axial direction. A stepped portion 15 is formed on one axial side of the support hole 14 at the center of the housing 2.
[0017]
A restraining ring 16 is attached to the other axial opening of the stepped portion 15 and the support hole 14, and the outer race spacer 10, the outer ring member 5, and the spacer 12 are sandwiched between the stepped portion 15 and the restraining ring 16. ing.
[0018]
The inner race spacer 11 and the inner race member 4 of the rolling bearing device 1 are sandwiched by spacers 13. The spacers 13 are provided with a holding nut member 17 screwed to one axial side of the drive shaft 3, and a drive shaft. 3 and a flange 18 formed on the other side in the axial direction.
[0019]
As shown in FIG. 3, a first oil supply hole 20 is formed in a portion of the housing 2 facing the outer race spacer 10 along a radial direction. A second oil supply hole 21 is formed in the outer race spacer 10 so as to communicate with the first oil supply hole 20 and extend along the radial direction.
[0020]
An annular holding groove 23 having a rectangular cross section and extending along the circumferential direction is formed on the opposed axial end face 22 of each inner ring member 4. The radially inward portion of the second oil supply hole 21 is formed by being bent in the axial direction so as to be open facing the holding groove 23 of the inner race member 4 of the rolling bearing device 1. More specifically, the second oil supply hole 21 is formed of a large diameter portion 21a directly communicating with the first oil supply hole 20 and a small diameter portion 21b formed by bending the large diameter portion 21a. ing.
[0021]
An annular V-shaped groove 24 having a substantially V-shaped cross section is formed along the peripheral edge on the side opposite to the side on which the inner raceway surface 6 is offset. The V-shaped groove 24 is formed at a position to avoid a contact portion of the ball 8 on the inner raceway surface 6.
[0022]
At the corner of the holding groove 23, a third oil supply hole 25 opened to the V-shaped groove 24 and communicating the holding groove 23 and the V-shaped groove 24 is provided at predetermined intervals in the circumferential direction of the inner ring member 4 (for example, 6 to 24). Location). An annular gap 26 is provided between a radially outer side portion of the ball 8 side opening of the third oil supply hole 25 and the rolling surface of the ball 8.
[0023]
An annular holding member 31 for holding the lubricating oil 30 is fitted into the holding groove 23 without any gap. The holding member 31 has a function of supplying the lubricating oil 30 toward the opening by centrifugal force accompanying the rotation of the inner ring member 4 about the axis. The holding member 31 is formed of a porous material such as a sintered material or a phenol resin.
[0024]
As the lubricating oil 30, oils equivalent to ISO VG10 to 32, such as hydraulic oil, industrial multipurpose oil, and bearing oil, are used. The lubricating oil 30 having a viscosity of 10 to 32 mm ² / s at 40 ° C. is used.
[0025]
Next, the lubrication operation of the rolling bearing device 1 will be described. The lubricating oil 30 forcibly supplied to the first oil supply hole 20 together with air from a predetermined position outside the rolling bearing device 1 passes through the large diameter portion 21 a of the second oil supply hole 21 and the small diameter portion of the second oil supply hole 21. The lubricating oil 30 is discharged from the small-diameter portion 21b to the lubrication oil 21b, and is absorbed and held by the porosity of the holding member 31.
[0026]
When the drive shaft 3 is rotated by the driving of the machine tool, the inner race member 4 is rotated around the axis together with the drive shaft 3, and a centrifugal force acts on the lubricating oil 30 in a radially outward direction. Then, the lubricating oil 30 gradually comes out of the holding member 31 according to the magnitude of the centrifugal force, reaches the V-shaped groove 24 when reaching each third oil supply hole 25, and a certain amount of the V-shaped groove 24 While the lubricating oil 30 is secured, the lubricating oil 30 is supplied to the rolling surface of the ball 8 to lubricate the inside of the bearing.
[0027]
Since the third oil supply hole 25 is communicated with the V-shaped groove 24 having an area larger than the opening area, the lubricating oil 30 once absorbed and held by the holding member 31 is removed by the centrifugal force. Can easily reach the V-shaped groove 24. In some cases, an excessive amount of the lubricating oil 30 that has reached the V-shaped groove 24 is discharged from the gap 26 to the outside of the bearing.
[0028]
Since the lubricating oil 30 is supplied to the rolling surface of the ball 8 by an amount corresponding to the centrifugal force, it is necessary that the stirring resistance accompanying the amount of the lubricating oil 30 when the ball 8 rolls becomes too large. In addition to this, the inside of the bearing can be reliably lubricated with the required amount of lubricating oil of 30.
[0029]
Since the lubricating oil 30 is supplied to the rolling surface of the ball 8 at any time by the centrifugal force after being held by the holding member 31, the air that has been constantly supplied conventionally is retained by the lubricating oil 30. What is necessary is just to supply intermittently so that it may be held by the member 31. Therefore, the cost associated with driving a drive device such as a motor for supplying air can be significantly reduced.
[0030]
【The invention's effect】
As is apparent from the above description, according to the present invention, the required amount of lubricating oil supplied to the holding member is supplied from the oil supply hole to the inside of the bearing according to the strength of the centrifugal force of the inner ring member. Lubrication, it is possible to suppress an increase in agitating resistance when the rolling element rolls, and it is only necessary to intermittently send air for supplying lubricating oil to the inside of the bearing. It is possible to suppress an increase in cost due to driving of the driving device.
[Brief description of the drawings]
FIG. 1 is a sectional view of a rolling bearing device according to an embodiment of the present invention in a used state in which the rolling bearing device is mounted on a machine tool.
FIG. 2 is a single sectional view showing the entire configuration of the rolling bearing device.
FIG. 3 is an enlarged sectional view showing a state of use similarly.
FIG. 4 is a partially enlarged front view of the rolling bearing device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rolling bearing device 2 Housing 3 Drive shaft 4 Inner ring member 5 Outer ring member 6 Inner ring raceway surface 7 Outer ring raceway surface 8 Ball 20 First oil hole 21 Second oil hole 21a Large diameter portion 21b Small diameter portion 23 Holding groove 24 V-shaped groove 25 Third oil supply hole 26 Gap 31 Holding member

Claims (3)

An inner ring member through which the shaft body is inserted and rotatably supported around the axis, an outer ring member arranged concentrically with the inner ring member, an inner raceway surface of the inner race member, and an outer raceway surface of the outer race member A plurality of rolling elements arranged so as to be able to roll freely between,
A retaining groove is formed on the axial end surface of the inner ring member along a circumferential direction of the inner ring member, and an oil supply hole for communicating the retaining groove and an opening formed at a predetermined position near the inner raceway surface or in the vicinity thereof. Is formed on the inner ring member,
A rolling bearing device, wherein a holding member is attached to the holding groove to hold the lubricating oil and supply the lubricating oil toward the opening, and the holding member is provided integrally with the inner race member so as to rotate. The rolling bearing device according to claim 1,
A rolling groove formed between the rolling element-side opening of the oil supply hole and the rolling surface of the rolling element along an edge of the inner raceway surface so as to avoid the inner raceway surface; Bearing device. The lubricating oil is held by the lubricating oil holding member provided on the inner ring member rotatable about the axis, the lubricating oil is forcibly supplied to the lubricating oil holding member at predetermined time intervals, and the inner ring member rotates about the axis. A lubricating method for a rolling bearing device, characterized in that the lubricating oil is supplied toward an opening formed at a predetermined position in the vicinity of an inner raceway surface of an inner race member or in the vicinity thereof by centrifugal force accompanying the operation.

Images