JP2007292117A - Rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing wherein lubricant reserved in a recessed portion in the inner diameter face of a cage is quickly supplied to a raceway portion and the guide face of the cage during dry run. <P>SOLUTION: In the inner diameter face of each annular portion 5a of the cage 5, a recessed groove 7a as the recessed portion for reserving the lubricant is provided extending to the circumferential direction. A plurality of small holes 8 are provided in each recessed groove 7a in communication with the outer diameter face of the cage 5. Thus, the lubricant reserved in each recessed groove 7a is quickly supplied through the small holes 8 in communication with the outer diameter face of the cage 5 to the raceway portion and the guide face of the cage during dry run. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rolling bearing that can be used without being seized for a predetermined time during a dry run.

  In rolling bearings that support high-speed rotating shafts, such as rolling bearings that support the main shafts of aircraft engines such as jet aircraft and helicopters, lubrication systems fail and lubricant is applied to the bearings. In an emergency dry run that is no longer supplied, it is required to be usable without being burned, for example, for 30 seconds or more.

  As a means for enabling the rolling bearing to be used without being seized for a predetermined time during such a dry run, a concave portion is formed as a lubricant reservoir in the inner diameter surface of the annular cage, and the lubricant is stored in the concave portion, A cage for a rolling bearing has been proposed in which the accumulated lubricant is supplied to the raceway portion by vapor, splash, or leaching by utilizing the temperature rise of the bearing during dry running (for example, Patent Document 1). reference). In the device described in Patent Document 1, an annular retainer is divided into two in the axial direction, and a concave portion that opens to the inner diameter surface is formed in these stamping portions.

  Although not intended for dry running, as a means to prevent seizure inside the bearing under rare lubrication conditions, a roller bearing in which the annular part of the cage is guided by the guide surface of the raceway ring A device in which a concave portion is provided in an annular portion of a cage guided by a guide surface has been proposed (for example, see Patent Document 2). In the embodiment described in Patent Document 2, the inner surface of the annular portion of the cage guided by the guide surface of the inner ring collar is provided with a concave groove penetrating the annular portion in the axial direction or the circumference of the annular portion. A concave groove extending in the direction is provided.

Japanese Utility Model Publication No. 6-87722 JP 2003-194066 A

  Patent Documents 1 and 2 describe that a lubricant stored in a recess or a groove serving as a lubricant storage part is a vapor, a droplet, or a bleed or There is a problem that seizure cannot be supplied to the cage guide surface and the like, and seizure occurs due to a delay in supplying the lubricant.

  Therefore, an object of the present invention is to enable the lubricant stored in the concave portion of the inner diameter surface of the cage to be quickly supplied to the track portion, the cage guide surface, and the like during the dry run.

  In order to solve the above problems, the present invention provides a rolling bearing in which a plurality of rolling elements are arranged between an inner ring and an outer ring, and these rolling elements are held in an annular retainer. A configuration was adopted in which a concave portion was provided on the inner diameter surface of the vessel, and a small hole communicating with the outer diameter surface of the cage was provided in the concave portion.

  That is, by providing a recess in the inner diameter surface of the annular retainer and providing a small hole in the recess in communication with the outer diameter surface of the retainer, the lubricant stored in the recess in the inner diameter surface of the retainer Through a small hole communicating with the outer diameter surface, it was possible to supply quickly to the track part, cage guide surface, etc. during dry run.

  The diameter of the small hole is 2 mm or less, preferably 1.5 mm or less. If the diameter of the small hole exceeds 2 mm, the flow resistance of the lubricant in the small hole becomes small, and the amount of the lubricant that flows out to the outer diameter surface side of the cage by the centrifugal force due to rotation increases. This is because sufficient lubricant cannot be stored.

  By providing the small holes at a plurality of locations in the circumferential direction of the cage, the lubricant can be supplied evenly in the circumferential direction to the track portion, the cage guide surface and the like.

  Each of the above-described rolling bearings is required to have high safety and is suitable for supporting the main shaft of an aircraft engine that rotates at high speed.

  In the rolling bearing of the present invention, a concave portion is provided on the inner diameter surface of the annular cage, and a small hole communicating with the outer diameter surface of the cage is provided in the concave portion. The agent can be quickly supplied to the track portion, the cage guide surface, and the like through a small hole communicating with the outer diameter surface of the cage during the dry run.

  By providing the small holes at a plurality of locations in the circumferential direction of the cage, the lubricant can be supplied evenly in the circumferential direction to the track portion, the cage guide surface and the like.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this rolling bearing, as shown in FIG. 1, the inner ring 2 is divided at the center of the raceway groove 2a, and the ball 3 as a rolling element has one point with the raceway groove 4a of the outer ring 4, and the raceway groove 2a with the inner ring 2 has two points. The ring-shaped cage 5 that holds the ball 3 is guided by the outer diameter guide surfaces on both sides of the raceway groove 2 a of the inner ring 2. Yes. One of the divided inner rings 2 is provided with a flange 2b for drawing out the bearing.

  As shown in FIGS. 2 (a) and 2 (b), the cage 5 is composed of two annular portions 5a and a plurality of pillar portions 5b, and is partitioned by these annular portions 5a and pillar portions 5b. A ball 3 is held in a pocket 6, and a concave groove 7a extending in the circumferential direction as a concave portion for storing a lubricant is provided on an inner diameter surface of each annular portion 5a. A plurality of small holes 8 communicating with the outer diameter surface are provided. As shown in FIG. 3A, these small holes 8 are provided at the circumferential positions of every other column portion 5b, and the diameter of each small hole 8 is 1 mm.

  FIG. 3B shows a modified example of the concave portion for storing the lubricant and the small hole 8. In this modification, the concave portion is a circular concave portion 7b, and the circular concave portion 7b is provided so as to straddle each annular portion 5a and the column portion 5b at the circumferential position of every second column portion 5b. Each recess 7b is provided with a small hole 8 communicating with the outer diameter surface of the cage 5. The diameter of these small holes 8 is also 1 mm.

  FIG. 4 shows a jet engine using the above-described three-point contact ball bearing 1. This engine is a turbofan engine, and includes a fan 11 that sucks air, a compressor 12 that compresses part of the sucked air, a combustion chamber 13 that injects fuel into the compressed air and burns, and a combustion The rotor 14 and the turbine 14 of the compressor 12 are attached to a main shaft 15 that is basically constituted by a turbine 14 that rotates at high speed with gas and is supported at two locations by the three-point contact ball bearing 1.

  In the embodiment and the modification described above, the cage is composed of two annular portions and a plurality of column portions, the concave portion for storing the lubricant is formed as a concave groove extending in the circumferential direction at the annular portion, and the annular ring. However, the positions and shapes of these recesses are not limited to those of the embodiment and the modified examples, and are provided in these recesses and are provided outside the cage. The small hole communicating with the radial surface may be bent or inclined to communicate with the outer radial surface.

  Furthermore, in the above-described embodiment, the rolling bearing is a three-point contact ball bearing. However, the rolling bearing according to the present invention can be applied to other rolling bearings such as other ball bearings and roller bearings. It can also be applied to rolling bearings.

Longitudinal sectional view showing an embodiment of a rolling bearing a and b are a longitudinal sectional view and an external perspective view, respectively, showing the cage of FIG. a is a developed plan view showing the inner diameter surface of the cage of FIG. 2, b is a developed plan view showing a modification of a 1 is a schematic longitudinal sectional view showing an engine of a jet aircraft using the rolling bearing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 3 point contact ball bearing 2 Inner ring 2a Raceway groove 2b Eave part 3 Ball 4 Outer ring 4a Raceway groove 5 Cage 5a Ring part 5b Pillar part 6 Pocket 7a Concave groove 7b Concave 8 Small hole 11 Fan 12 Compressor 13 Combustion chamber 14 Turbine 15 spindle

Claims (4)

  In a rolling bearing in which a plurality of rolling elements are arranged between an inner ring and an outer ring, and these rolling elements are held in an annular retainer, a recess is provided on an inner diameter surface of the annular retainer, and the recess is provided with the recess A rolling bearing having a small hole communicating with an outer diameter surface of a cage.   The rolling bearing according to claim 1, wherein the small hole has a diameter of 2 mm or less.   The rolling bearing according to claim 1, wherein the small holes are provided at a plurality of locations in a circumferential direction of the cage.   The rolling bearing according to claim 1, wherein the rolling bearing supports a main shaft of an aircraft engine.

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