JPH11108067A - Oil lubrication device of rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a self-feeding lubrication, not a forced lubrication, even though the d.n value of a bearing is large. SOLUTION: Both bearings 4 and 4 which consist of an inner ring 4a; an outer ring 4b; a rolling body 4c; and a holder 4d; are installed to a bearing box 1 surrounded by covers 3a and 3b, and a shaft 2. To the corner of the outer diameter end of the inner ring 4a, more than one cutout 10 having a slope directing in the direction of the rolling body 4c are formed, to provide a taper collar 11. Both bearings 4 and 4 are fixed to the bearing box 1 by a spacer 21 and a fastener 22, and a shaft seal device 23 and a negative pressure means 24 are installed to both the covers 3a and 3b. The lubricating oil drops down from an oil receiver 28 through a sector 27 by an oil ring 26, and drops down to the taper collar 11. The luricating oil is led in to the inside of the holder 4d by the strong pumping operation of the cutout 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil lubrication system for a rolling bearing of a horizontal axis or a vertical axis, and is applied to a radial ball bearing such as a deep groove ball bearing and an angular ball bearing, as well as to a radial roller bearing. However, the present invention relates to an oil lubricating device for a rolling bearing which is suitable for a bearing having a large d · n value (d is a shaft diameter mm and n is the number of revolutions per minute).

[0002]

2. Description of the Related Art A conventional example shown in FIG. 3 is for forcibly lubricating a double-row back-to-back combined bearing device of an angular contact ball bearing.
In the figure, a cover 3 is fitted into a bearing housing 1 and a shaft 2 and
The two bearings 4 surrounded by a and 3b each include an inner ring 4a, an outer ring 4b, a rolling element 4c, and a retainer 4d. Double bearing 4
Is axially positioned by the collar 51 on the inner race 4a and by the spacer 52 on the outer race 4b. The spacer 52 and one cover 3a are provided with a lubricating oil ejection port 53 directed toward a gap between the inner ring 4a and the retainer 4d, and a forced oil supply device (not shown) is provided at the other end of the ejection port 53. Since the lubricating oil in the retainer 4d travels from the inner ring 4a side to the outer ring 4b side by centrifugal force, it is not advisable to direct the ejection port 53 to the gap between the outer ring 4b and the retainer 4d.

[0003]

Generally, the gap between the retainer 4d and the inner ring 4a is small in order to guide the rotation of the retainer 4d of the rolling bearing. When the bearing has a large d · n value as in the above-described conventional example, it becomes difficult for the lubricating oil to flow into the clearance, which is smaller in the end face shape of the retainer 4d and the wind pressure accompanying the rotation of the rivet. For this reason, self-lubrication lubrication such as oil bath lubrication, dripping lubrication, or mist lubrication is not sufficient, and requires forced lubrication by the ejection port 53 and a forced lubrication device. Further, since the gap between the retainer 4d and the inner ring 4a is small, a large amount of oil is required for the forced lubrication device even when forced lubrication is performed. Oil bath lubrication, drop lubrication,
Atomized lubrication, forced lubrication, etc. are described in the Rolling Bearing Lubrication section of the Mechanical Engineering Handbook.

An object of the present invention is to provide an oil lubricating device for a rolling bearing which enables self-lubricating lubrication without necessarily requiring forced lubrication by a forced lubricating device even when the d · n value of the bearing is large. It is in.

[0005]

An oil lubricating device for a rolling bearing according to a first aspect of the present invention is a bearing comprising an outer ring, an inner ring, a rolling element, and a retainer, which is directed toward a rolling element at an outer diameter end of the inner ring. A notch having a slope is provided. According to the oil lubricating device for a rolling bearing of the first aspect, even if the lubricating oil is in the form of drops or mist and the d · n value of the bearing is large or the gap between the retainer and the inner ring is small, it has a slope. The notch positively introduces lubricating oil into the retainer by a pump action. For this reason, the rolling elements and rolling surfaces in the cage are well lubricated.

In a second aspect of the present invention, in the first aspect, a means for jetting lubricating oil toward the notch is disposed on the notched end surface of the inner ring. According to the second aspect, since the lubricating oil jetting means is directed toward the notch, the lubricating oil is more reliably introduced into the retainer.
In a third aspect of the present invention, in the second aspect, the ejection means is a tapered collar having a taper substantially continuous with the slope of the notch.

According to the third aspect, the taper of the taper collar guides the lubricating oil to the notch by the pump action. Invention 4 is Invention 2
In the above, the jetting means is a lubricating oil jet toward the notch. According to the fourth aspect, the lubricating oil is guided from the jet port to the notch.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. In the drawings, the parts denoted by the same reference numerals have substantially the same functions, and description thereof may be omitted. In the first embodiment shown in FIGS. 1 and 2, a double-row back-to-back combined bearing device of an angular ball bearing having a horizontal axis is dripped and atomized. In the figure, both bearings 4 fitted into a bearing housing 1 and a shaft 2 and surrounded by covers 3a and 3b respectively have inner rings 4a.
And an outer ring 4b, a rolling element 4c, and a retainer 4d. The dual bearing 4 has at least one notch 10 having a slope facing the rolling element 4c at the corner of the outer diameter end of the inner ring 4a. Then, a taper collar 11 having a taper substantially continuous with the slope of the notch 10 is disposed as an injection means of the lubricating oil toward the notch 10 on the end face of the inner ring 4a where the notch 10 is present. A discharge pump 29 may be mounted on the other bearing 4.

Next, a description will be given of a conventional structural part of the bearing device of the dripping and atomized lubrication used in this embodiment. The two bearings 4, which keep the interval in the axial direction by the spacer 21, are fixed to the bearing housing 1 by the fastener 22. A shaft sealing device 23 and a negative pressure means 24 are mounted between the two covers 3a, 3b and the shaft 2.
An oil ring 26 whose lower end is immersed below the oil level 25 of the lubricating oil stored in the oil reservoirs in the lower inner portions of the covers 3a and 3b is hung on the shaft 2, and splashes of the lubricating oil due to rotation are caused by a sector 27.
And is caught by an inclined trough-shaped oil receiver 28. The lubricating oil dropped from the oil receiver 28 falls on the taper of the one taper collar 11. According to the first embodiment, the droplet-shaped lubricating oil that falls on the tapered collar 11 guides the lubricating oil to the notch 10 by the taper pumping action of the tapered collar 11. Since the notch 10 having a slope has a groove shape, it naturally has a radial surface and exhibits a powerful pumping action.
Is positively introduced into the retainer 4d by the powerful pumping action of the notch 10. For this reason, the rolling elements 4c and rolling surfaces in the retainer 4d are well lubricated. This effect is particularly effective when the d · n value of the bearing is large.

A modification of the first embodiment will be described. Even in the conventional example in which the above-described forced lubrication is performed, since the gap between the retainer 4d and the inner ring 4a is generally small, a notch 10 is provided in the inner ring 4a, and a lubricating oil outlet 53 (see FIG. ), The amount of refueling of the forced refueling device can be reduced. This is because the notch 10 has a powerful pump action. In the first embodiment, the horizontal axis is a dripping and atomized lubrication method. However, a simple pump may be provided on the shaft 2 instead of the oil ring 26 and the oil receiver 28 so that the vertical axis may be used, as is often performed.

[0011]

According to the oil lubricating device for a rolling bearing according to the first aspect of the present invention, the notch in the inner ring positively introduces the lubricating oil into the retainer by the pump action, so that the rolling elements and the rolling surfaces in the retainer. Is well lubricated and does not necessarily require forced lubrication by a forced lubrication system even when the d / n value of the bearing is large,
This has the effect of enabling self-lubricating lubrication.

According to the second aspect, since the lubricating oil jetting means is directed toward the notch, the lubricating oil is more reliably introduced into the retainer. According to the third aspect, there is an effect that the taper collar guides the lubricating oil to the notch by the pump action. According to the fourth aspect, the lubricating oil is guided from the jet port to the notch, and the amount of lubrication of the forced lubrication device can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part including a rotation drawing sectional view of a first embodiment.

FIG. 2 is an enlarged sectional view of a main part of FIG. 1;

FIG. 3 is a half sectional view of a conventional example.

[Explanation of symbols]

1 Bearing Box 2 Shaft 3a Cover 3b Cover 4 Bearing 4a Inner Ring 4b Outer Ring 4c Rolling Element 4d Cage 10 Notch 11 Tapered Collar 21 Spacer 23 Fastener 24 Negative Pressure Means 25 Oil Level 26 Oil Ring 27 Sector 28 Oil Receiver 29 Discharge Pump

Claims (4)

[Claims] In a bearing comprising an outer ring, an inner ring, a rolling element and a cage, a notch having a slope facing the rolling element is provided at a corner of an outer diameter end of the inner ring. Lubrication device. 2. An oil lubricating device for a rolling bearing according to claim 1, wherein a means for jetting lubricating oil toward the notch is disposed on a notched end surface of the inner race. 3. An oil lubricating device for a rolling bearing according to claim 2, wherein said jetting means is a tapered collar having a taper substantially continuous with a slope of said notch. 4. The oil lubricating device for a rolling bearing according to claim 2, wherein the jetting means is a spout of lubricating oil toward the notch.