JP2008057556A - Cage for rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cage for a rolling bearing capable of preventing drop out of a roller and misalignment of the cage in a radius direction or an axial direction, and further suppressing a temperature rise of the roller during bearing operation. <P>SOLUTION: One of a pair of pocket surfaces facing with an outer diameter surface of the roller 3 from both sides is formed of a recessed circular surface 5a for receiving the outer diameter surface of the roller 3, and another pocket surface is formed of a flat surface 5b. Thereby, the drop out of the roller 3 and the misalignment of the cage 4 in the radius direction can be prevented by the one pocket surface formed of the recessed circular surface 5a, and sufficient lubricant is supplied between the outer diameter surface of the roller 3 and the pocket surface on a pocket surface side formed of the flat surface 5b, and the temperature rise of the roller 3 during the bearing operation is suppressed by cooling effect. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a roller bearing retainer used for a roller bearing for radial load or thrust load.

  In radial roller bearings mainly for radial loads such as cylindrical roller bearings and tapered roller bearings, and thrust roller bearings for thrust loads, the outer diameter of the rollers is used to hold the rollers arranged on the raceway surface of the inner ring and outer ring. A cage in which a pocket having a pair of pocket surfaces facing the surface from both sides is formed is used.

  In such a roller bearing retainer, the pair of pocket surfaces facing the outer diameter surface of the roller from both sides fall off the roller, the radial roller bearing is displaced in the radial direction of the cage, and the thrust roller bearing is In order to prevent axial displacement, it is formed of a concave surface that receives the outer diameter surface of the roller (see, for example, Patent Document 1). The concave surface of the pocket surface is often a concave arc surface along the outer diameter surface of the roller when the cage is guided by the roller as described in Patent Document 1.

  The roller bearing cage described above is formed by cutting out a metal material, injection molding of a resin material, or the like. For example, in the case of a radial roller bearing for a machined cage formed by cutting a metal material, as shown in FIGS. 2 and 3 for explaining a later embodiment, an annular metal material 11 is used. Then, after drilling the pilot holes 12 at the positions where the pockets are formed, and expanding the pilot holes 12 into the rectangular holes 13 for the pockets with the end mill 22, as shown in FIGS. 5 (a) and 5 (b), In the drum-shaped end mill 23, a pair of pocket surfaces 14 opposed to the quadrangular holes 13 are formed on concave surfaces such as concave arc surfaces.

JP-A-11-218135

  As described in Patent Document 1, in a roller bearing retainer in which a pair of pocket surfaces are formed as concave surfaces such as concave arc surfaces, it is difficult for lubricant to be supplied between the outer surface of these pocket surfaces. The cooling efficiency of the roller by the lubricant is poor. For this reason, there is a risk that the roller will abnormally rise in temperature during operation of the bearing and seize with the inner and outer rings. In the case of a machined cage formed by cutting out a metal material, there is a risk that the rollers will seize with the cage.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a roller bearing retainer that can prevent a roller from dropping off and a radial or axial displacement of the retainer and suppress the temperature rise of the roller during bearing operation.

  In order to solve the above-mentioned problems, the present invention provides a roller bearing retainer in which a pocket having a pair of pocket surfaces facing the outer diameter surface of a roller from both sides is formed, and the pair of pocket surfaces is held in the pocket. One of the pocket surfaces was formed as a concave surface that received the outer diameter surface of the roller, and the other was formed as a flat surface.

  That is, one of the pair of pocket surfaces is formed as a concave surface that accepts the outer diameter surface of the roller, and the other is formed as a flat surface. Along with preventing the axial displacement and supplying sufficient lubricant between the outer surface of the roller on the pocket surface side formed by a flat surface, the cooling effect can suppress the temperature rise of the roller during bearing operation I did it.

  When the cage is a machined cage formed by cutting a metal material, the cutting process for forming the pocket surface into a concave surface can be halved and the risk of seizure with the rollers can be eliminated.

  In the roller bearing retainer of the present invention, one of the pair of pocket surfaces is formed as a concave surface that accepts the outer diameter surface of the roller, and the other is formed as a flat surface. In addition to preventing radial or axial displacement of the roller and cage, supply sufficient lubricant between the outer surface of the roller on the flat pocket side and increase the temperature of the roller during bearing operation. Can be suppressed.

  When the cage is a machined cage formed by cutting a metal material, the cutting process for forming the pocket surface into a concave surface can be halved and the risk of seizure with the rollers can be eliminated.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a roller bearing using a roller bearing retainer according to the present invention. This roller bearing is a radial roller bearing in which a plurality of rollers 3 arranged between raceway surfaces 1 a and 2 a of an inner ring 1 and an outer ring 2 are held by an annular cage 4. One of the pair of pocket surfaces facing each other is formed by a concave arc surface 5a, and the other is formed by a flat surface 5b. Accordingly, the roller 3 is prevented from falling off or the cage 4 is displaced in the radial direction on one pocket surface formed by the concave arc surface 5a, and the outer diameter surface of the roller 3 on the pocket surface side formed by the flat surface 5b. Sufficient lubricant is supplied between the two and the temperature rise of the roller 3 during the operation of the bearing is suppressed.

  The cage 4 is formed by cutting a metal material. First, as shown in FIGS. 2A and 2B, a drill 21 is formed at a position where each pocket is formed in an annular metal material 11. After the lower hole 12 is opened, the lower hole 12 is enlarged to a rectangular hole 13 for pockets by the end mill 22 as shown in FIGS. 3 (a) and 3 (b). Thereafter, as shown in FIGS. 4A and 4B, in the drum-shaped end mill 23, only one of the pair of facing pocket surfaces 14 of the square hole 13 is formed on the concave arc surface 5a, and the other Is a flat surface 5 b that has been processed by the end mill 22. Therefore, compared with the processing of the conventional cage shown in FIGS. 5A and 5B, the processing of the pocket surface by the end mill 23 is halved.

  In the above-described embodiment, the cage is a machined cage for radial roller bearings, but the roller bearing cage according to the present invention is also applicable to a thrust bearing that radially holds rollers in a plane. It can also be applied to a cage formed by injection molding of a resin material.

Cross-sectional view showing a roller bearing using a roller bearing retainer according to the present invention a is a partially omitted side view showing a state in which a pilot hole is opened in the cage of FIG. 1, and b is a transverse sectional view of a. a is a partially omitted side view showing a state in which the lower hole in FIG. 2 is expanded into a rectangular hole for pockets, and b is a cross-sectional view of a. a is a partially omitted side view showing a state in which one of a pair of pocket surfaces of the rectangular hole in FIG. 3 is formed as a concave arc surface, and b is a cross-sectional view of a. a is a partially omitted side view showing a state in which a pair of pocket surfaces of a square hole of a conventional cage is formed as a concave arc surface, and b is a transverse sectional view of a.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 1a, 2a Raceway surface 3 Roller 4 Cage 5a Concave circular arc surface 5b Flat surface 11 Metal material 12 Lower hole 13 Square hole 21 Drill 22, 23 End mill

Claims (2)

  A pocket having a pair of pocket surfaces facing the outer diameter surface of the roller from both sides is formed, and in the roller bearing retainer for holding the roller in the pocket, one of the pair of pocket surfaces is used as the outer diameter surface of the roller. A roller bearing retainer characterized in that it is formed of a concave surface to receive and the other is formed of a flat surface.   The roller bearing cage according to claim 1, wherein the cage is a machined cage formed by cutting a metal material.

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