JPH0988976A - Oil feeder of rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply a bearing with lubricating oil sufficiently and securely without making any feed hole in an inner ring of the bearing when the lubricating oil is fed to the bearing inside from an oil feed passage of a shaft. SOLUTION: An oil feed plate 8 is attached to one side end of an inner ring 5 of an angular type ball bearing clamped to the vicinity of a shaft 2, and a recess 11 and a groove 13 continued from it both are formed an end face at the side of the inner ring 5 of the oil feed plate 8, forming an oil feed sump 12 by the end face of the inner ring 5 and the recess 11, and simultaneously an oil feed nozzle 14 is formed in space between the groove 13 and the end face of the inner ring 5, through which a branch passage 4 of the shaft 2 is interconnected to this oil feed sump 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil supply device for a rolling bearing in a scroll compressor, a machine tool main shaft or the like.

[0002]

2. Description of the Related Art As an oil supply device of this type, as shown in FIG. 6, an oil supply passage 3 is provided at the center of a shaft 2 to which an angular ball bearing 1 is fixed, and a radial direction communicating with the oil supply passage 3 is provided. A branch passage 4 is provided, and an inner ring 5 of the bearing 1 is provided with an oil supply hole 6 communicating with the branch passage 4.

[0003]

When the inner ring 5 of the angular type ball bearing 1 as described above is provided with the oil supply hole 6, it can be provided at a position avoiding the raceway 7. However, the cylindrical roller bearing as shown in FIG. In the case of 1 ', there is no space in the space, and the track 7 must be provided with the oil supply hole 6.

In any of the above cases, since the inner ring 5 is provided with the oil supply hole 6, the size of the hole diameter is limited, and it is not possible to form a hole of a desired size. The provision of is limited in terms of maintaining the accuracy of the bearing. Further, when a hole is formed in the raceway surface 7 as shown in FIG. 7, there is a problem that the tissue is separated from the hole as a starting point.

In view of the above points, an object of the present invention is to make it possible to perform required lubrication without adversely affecting the performance of the bearing.

[0006]

In order to achieve the above object, the present invention provides an oil supply passage on a shaft, and a branch passage communicating with the oil supply passage corresponding to a rolling bearing fixed to the shaft. In the lubrication device for a rolling bearing, the lubrication plate fitted to one end of the inner ring of the rolling bearing is fixed around the shaft, and the inner face of the lubrication plate is provided with a predetermined interval in the circumferential direction. The oil reservoir is provided between the inner ring and the recess formed by the above, and an oil filler nozzle is provided between the groove and the inner ring communicating with the recess, and the branch passage of the shaft is communicated with the oil reservoir. Is.

[0007]

In the oil supply device having the above structure, the lubricating oil is supplied to the oil supply sump through the oil supply passage and the branch passage of the shaft, and is further supplied from the oil supply sump to the inside of the rolling bearing through the oil supply nozzle.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, an angular ball bearing 1 is fixed around a shaft 2, and an oil supply plate 8 is fitted to one end of an inner ring 5 thereof. The oil supply plate 8 has an annular shape as a whole, and is interposed between the inner ring 5 and the step portion 10 of the shaft 2 to fix the other end of the inner ring 5 by tightening it with a nut 15. A projecting portion 9 projecting toward the bearing 1 is formed on the outer peripheral portion of the oil supply plate 8, and the projecting portion 9 is fitted to the outer diameter surface of the end portion of the inner ring 5.

Further, on the end surface of the oil supply plate 8 on the inner ring 5 side, there are formed recesses 11 open to the inner diameter side at regular intervals in the circumferential direction (see FIG. 4). The recesses 11 and the inner ring are formed. An oil supply sump 12 is formed by the end face of 5 (see FIG. 2).

A shallow groove 13 is formed from the upper end of the recess 11 along the inner surface of the protrusion 9 and having the same width as that of the recess 11, the shallow groove 13 being open at the tip of the inner surface of the protrusion 9. An oil supply nozzle 14 having a constant gap is formed between the shallow groove 13 and the inner ring 5. The refueling nozzle 14 communicates with the refueling sump 12 and is opened on the outer diameter surface of the inner ring 5.

A refueling passage 3 is formed at the center of the shaft 2, and a plurality of branch passages 4 communicating with the refueling passage 3 are formed in the radial direction (see FIG. 3), each communicating with the refueling sump 12. To be done.

In the above oil supply device, the lubricating oil supplied to the oil supply passage 3 by the internal pressure is supplied to the inside of the bearing through the branch passage 4, the oil supply sump 12 and the oil supply nozzle 14 by the centrifugal force (arrow A in FIG. 2). reference).

The amount of refueling is adjusted by selecting the width and depth of refueling nozzles 14 and the number of refueling nozzles 14.

The other embodiment shown in FIG. 5 is applied to a cylindrical roller bearing 1 ', and the construction and operation of the oil supply device are the same as those described above.

[0015]

As described above, according to the present invention, the lubricating oil is supplied to the inside of the bearing through the oil supply reservoir and the oil supply nozzle provided between the inner ring of the rolling bearing and the oil supply plate. There is no need to make holes.

Further, the dimensions of the oil supply reservoir and the oil supply nozzle can be variously selected according to need, so that oil supply suitable for the bearing can be performed.

Further, since the lubricating oil is supplied from the oil supply nozzle in the axial direction, the lubricating oil can be surely distributed inside the bearing.

[Brief description of drawings]

FIG. 1 is a partial sectional view of an embodiment.

FIG. 2 is a partially enlarged sectional view of the above.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a partial front view of the oil supply plate of the above.

FIG. 5 is a sectional view of another embodiment.

FIG. 6 is a partial sectional view of a conventional example.

FIG. 7 is a partial cross-sectional view of another conventional example.

[Explanation of symbols]

 1 Angular Ball Bearing 1'Cylindrical Roller Bearing 2 Shaft 3 Lubrication Passage 4 Branch Passage 5 Inner Ring 6 Lubrication Hole 7 Orbit 8 Lubrication Plate 9 Projection 10 Step 11 Recess 12 Oil Reservoir 13 Groove 14 Oil Nozzle 15 Nut

Claims (1)

[Claims] 1. An inner ring of a rolling bearing in a lubricating device for a rolling bearing, wherein an oil supply passage is provided on a shaft, and a branch passage communicating with the oil supply passage is provided on the shaft so as to correspond to the rolling bearing fixed to the shaft. An oil supply plate fitted to one end of the oil supply plate is fixed around the shaft, and an oil supply reservoir is provided between the inner ring and a recess formed at a predetermined interval in the circumferential direction on the inner ring side end surface of the oil supply plate, An oil supply device for a rolling bearing, wherein an oil supply nozzle is provided between an inner ring and a groove communicating with the recess, and a branch passage of the shaft is communicated with the oil supply reservoir.