JP2016090053A - Bearing cage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a problem of insufficient lubrication between a bearing cage and rolling elements found at a stage of starting motor as well as abrasion of each of the parts and a reduction in life of a bearing.SOLUTION: This invention provides a bearing cage [1] having pockets [10] for restricting motion of a plurality of rolling elements [20] rolling and moving between an inner race and an outer race in response to the number of rolling elements [20]. Each of the pockets [10] at each of the locations in the bearing cage [1] is formed with a recess or a cavity [13] for storing grease at its inner surface contacting with each of rolling elements [20]. Since this type of bearing cage can assure that at least a part of grease is always accumulated in a grooved roll or a cavity, this feature is effective for resolving a problem of insufficient lubrication between the bearing cage and the rolling element at a stage of starting to drive a motor. In reference to the bearing cage, this invention further provides various types of usual rolling bearings using the bearing cage.SELECTED DRAWING: Figure 1a

Description

  The present invention relates to a cage for a bearing and is applied to various normal type rolling bearings.

  In high speed railway applications, train traction motor bearings tend to take the form of grease lubrication. This is because if an oil lubrication circulation system is used in a harsh environment, impurities can enter and the life of the bearing can be significantly reduced. However, there is a problem with the grease lubrication itself, for example, its consistency is relatively large and it is relatively difficult to enter the cage pockets. Therefore, changing to grease lubrication tends to cause inadequate lubrication between the rolling elements and the cage at the stage of starting the bearing, causing wear of the parts and reducing the life of the bearing.

  In order to solve the above problems, the present invention provides a bearing cage. The bearing cage is formed to have pockets corresponding to the number of rolling elements, and is used to regulate rolling elements that roll between the inner ring and the outer ring. In each pocket, a recess or a cavity for accommodating grease is formed on the inner surface in contact with the rolling element. Based on the above cage, the present invention further provides various normal types of rolling bearings using the cage.

  The cage can ensure that at least a part of the grease is always accumulated in the grooved roll or cavity, so that the lubrication is insufficient at the stage of starting the motor between the cage and the rolling element. It is advantageous to solve the problem.

  Hereinafter, specific embodiments and effects of the present invention will be described in detail in conjunction with the drawings.

It is a local section schematic diagram of the maintenance machine of the present invention when it sees from an axial direction. It is the local enlarged view of A area | region in FIG. FIG. 2 is a schematic diagram of a local cross section of the cage of the present invention taken along line 2-2 in FIG. 1a. It is the local enlarged view of the B area | region in FIG. 2a. It is a local cross-section enlarged view of the inner surface structure of the bar of the cage. It is a local cross-sectional enlarged view of the inner surface structure of the bar of another cage.

  FIG. 1 a is a schematic cross-sectional view of a local section of the cage of the present invention when viewed from the axial direction. Shown in FIG. 1b is a single pocket of the cage limited to region A in FIG. 1a. As shown in the figure, the cage 1 is formed with several pockets 10 corresponding to the number of rolling elements 20. The pocket 10 is surrounded by cage bars 11 that limit the rolling elements 20 in the circumferential direction and cage side rings 12 that limit the rolling elements 20 in the axial direction. Become. The side ring 12 of the cage is formed with at least one groove or cavity 13 for accumulating and containing grease on the inner surface that contacts the rolling element 20. The cavity 13 may be a through hole because it is beneficial for the grease to circulate in and out of the pocket 10 and is a dead-hole with a certain depth for accommodating the grease. ended holes). In addition, the shape of the recess or cavity 13 is not limited to the circle shown in the figure. In fact, any conventional geometry can be used if it is advantageous to contain grease.

  FIG. 2a is a schematic diagram of a local cross section of the cage taken along line 2-2 in FIG. 1a. FIG. 2b is a locally enlarged view of region B in FIG. 2a. As shown in FIG. 2b, the retainer bar 11 may be formed with at least one recess or cavity 13 which is roughly circular and distributed in dots, depending on the situation of the side ring 12 of the retainer. Similarly, any other conventional geometric shape and distribution may be employed. As shown in FIGS. 3a and 3b, the recess or cavity 13 may be regular hexagonal or linear. Of course, for the purpose of grease lubrication circulation, these recesses or cavities 13 may also be through holes.

  It should be pointed out that, for illustrative purposes, what is shown in FIGS. 1 to 3 is actually a retainer for a cylindrical roller bearing. To make it easier to understand, any other conventional type of rolling bearing, such as a tapered roller bearing, an angular contact bearing, a deep groove ball bearing, a self-aligning ball bearing ( For self-aligning ball bearings, spherical ball bearings, CARB toroidal roller bearings, etc., install a recess or cavity in the inner wall of the cage pocket. Can be used for the purpose of containing grease. In other words, in a normal type rolling bearing in which the inner ring and the outer ring sandwich the rolling element, if a pocket is formed in the cage to restrict the movement of the rolling element, a recess or a cavity is installed on the inner wall of the pocket. Grease can be accommodated, whereby the problem of insufficient grease lubrication at the operation start stage of the bearing can be solved.

  Also, from the viewpoint of manufacturing materials, depending on the working environment and the difference in load characteristics, the cage 1 is made of carbon steel, steel alloys, copper alloys, aluminum alloys ( Aluminum alloys, sintered materials, composite materials, engineering plastics, etc. can be used as the production material.

  Those skilled in the art should understand that any changes and modifications to the retainer and its use are all within the protection scope of the present invention, provided that they conform to the limitations of the appended claims.

DESCRIPTION OF SYMBOLS 1 Retainer 10 Pocket 11 Retainer bar 12 Retainer side ring 13 Recess or cavity 20 Rolling element

Claims (9)

  In the bearing cage (1) having pockets (10) for restricting a predetermined number of rolling elements (20) that roll and move between the inner ring and the outer ring corresponding to the number of rolling elements (20), The bearing retainer (1) is characterized in that the pocket (10) at the location is formed with a recess or a cavity (13) for accommodating grease on the inner surface in contact with the rolling element (20).   2. The recesses or cavities (13) formed in a circular or regular polygon, distributed in the form of dots, or formed in a straight line and distributed parallel to each other. Cage (1).   The said cage | basket (1) uses at least 1 type of a carbon steel, an alloy steel, a copper alloy, an aluminum alloy, a sintered material, a composite material, and an engineering plastic as the manufacturing material. A cage (1) according to claim 1.   The cage (1) according to any one of claims 1 to 3, characterized in that the cage (1) is a cage of a cylindrical roller bearing.   Retainer (1) according to claim 4, characterized in that the recess or cavity (13) is formed in the inner surface of the retainer bar (11).   The cage (1) according to claim 4, characterized in that the recess or cavity (13) is formed on the inner surface of the side ring (12) of the cage.   Cylindrical roller bearing, characterized in that the cage (1) according to any one of claims 4 to 6 is used.   In a normal type rolling bearing having a conventional rolling structure in which an inner ring and an outer ring sandwich a rolling element, the cage (1) according to any one of claims 1 to 3 is used. Type of rolling bearing.   9. The normal type according to claim 8, wherein the normal type rolling bearing is a tapered roller bearing, an angular ball bearing, a deep groove ball bearing, a self-aligning ball bearing, a spherical roller bearing or a CARB toroidal roller bearing. Rolling bearings.

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