JP2008261484A - Radial ball bearing cage and radial ball bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radial ball bearing cage which suppresses the film runout of lubricant between each pocket and each ball, and also to provide a radial ball bearing. <P>SOLUTION: The radial ball bearing cage 20 is annularly formed as a whole to rollingly hold a plurality of balls arranged between the raceway surfaces of the radial ball bearing, where pockets 18 are provided in a plurality of positions in the circumferential direction. A lubricant reservoir portion 25 is provided in an annular inner diameter face 28 thereof. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a radial ball bearing retainer and a radial ball bearing that are formed in an annular shape in order to hold a plurality of balls in a freely rolling manner, and pockets are provided at a plurality of locations in the circumferential direction.

  Radial ball bearings are widely used in bearing parts that support rotating shafts and the like in various rotating machinery devices. A schematic configuration of a conventional example of this radial ball bearing is shown in FIG. 4 (Patent Documents 1, 2, and 3 below). reference). The radial ball bearing 10 of FIG. 4 has an inner ring 2 in which an inner ring raceway surface 1 is formed on an outer peripheral surface and an outer ring 4 in which an outer ring raceway surface 3 is formed on an inner peripheral surface. A plurality of balls 5 are provided between the raceway surface 3 so as to be freely rollable. The plurality of balls 5 are held by a cage 6 so as to be freely rollable. FIG. 5 shows a perspective view of the cage 6 of FIG.

  As shown in FIG. 5, the cage 6 is formed in an annular crown shape, and is manufactured by injection molding from a resin, and is used in place of a corrugated cage that is manufactured by press molding from a conventional metal. (See Patent Documents 1, 2, and 3 below). 5 includes a pocket 18 provided to hold the balls 5 (FIG. 4) at a plurality of locations in the circumferential direction of an annular main portion 17 in a freely rolling manner, and both sides of the pocket 18. A plurality of elastically deformable pairs of elastic pieces 16a and 16b provided on the surface are provided. Each pocket 18 is substantially composed of one side surface of a pair of elastic pieces 16a and 16b arranged at a distance from each other in the main portion 17, and a concave surface portion 19 provided between the pair of elastic pieces 16a and 16b. The whole is formed in a spherical shape. An opening T is formed between the pair of elastic pieces 16a and 16b in the upper portion of each pocket 18 in the figure.

  When the radial ball bearing as shown in FIG. 4 is assembled using the crown type cage 6 shown in FIG. 5, the ball 5 is elastically pushed to increase the distance between the tip edges of the pair of elastic pieces 16 a and 16 b of the pocket 18. It inserts so that it may push from the opening part T between elastic pieces 16a and 16b. In this way, the crown-shaped cage 6 holds the balls 5 in the pockets 18 so that the balls 5 can roll between the inner ring raceway surface 1 and the outer ring raceway surface 3 (FIG. 4). .

As described above, the conventional radial ball bearing retainer is generally a metal corrugated retainer or a resin annular crown retainer with a pocket formed of a single spherical surface. Met.
Japanese Patent No. 3744663 Japanese Patent No. 3035766 JP 2005-133893 A

  A radial ball bearing as shown in FIG. 4 is used with a lubricant such as grease filled inside the bearing, and during this use, between each pocket 18 and the ball 5 of the cage 6 shown in FIGS. Lubricant is supplied to form a lubricant film. However, the lubricant hardly accumulates on the inner diameter surface 28 of the cage 6 in FIG. 5, and the lubricant is not sufficiently supplied between the pocket 18 and the ball 5 during the rotation of the bearing, so that the lubricant film is likely to be broken. Therefore, problems such as so-called burning of balls, generation of noise, and increase in rotational torque occur.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a radial ball bearing retainer and a radial ball bearing capable of suppressing the film breakage of the lubricant between the pocket and the ball. .

  In order to achieve the above object, a radial ball bearing retainer according to the present invention is formed in an annular shape as a whole in order to hold a plurality of balls arranged between raceway surfaces of a radial ball bearing in a freely rolling manner. A radial ball bearing retainer having pockets at a plurality of locations in a circumferential direction, wherein a lubricant reservoir is provided on the annular inner surface.

  According to this radial ball bearing retainer, when used in a radial ball bearing, the lubricant is retained in the lubricant reservoir provided on the annular inner surface, and the lubricant is retained from the lubricant reservoir during rotation of the bearing. The lubricant can be sufficiently supplied between the pocket and the ball, and the film breakage of the lubricant can be suppressed between the pocket and the ball. For this reason, it is possible to prevent problems such as ball burning, noise generation, and rotational torque increase.

  In the radial ball bearing retainer, it is preferable that the lubricant reservoir is configured in a groove shape so as to extend in a circumferential direction of the inner diameter surface and connected to the pocket.

  The lubricant reservoir may be intermittently positioned due to the presence of the pockets in the circumferential direction.

  In addition, each pocket can be configured to be able to supply lubricant from the lubricant reservoirs on both sides. In addition, although the lubricant reservoir is continuously formed between each pocket and an adjacent pocket, it may be formed by being divided.

  In the radial ball bearing according to the present invention, an inner ring having an inner ring raceway surface on an outer peripheral surface and an outer ring having an outer ring raceway surface on an inner peripheral surface are arranged concentrically with each other, and between the inner ring raceway surface and the outer ring raceway surface, The above-mentioned radial ball bearing retainer is used to hold a plurality of balls, and the bearing is filled with a lubricant.

  According to this radial ball bearing, since the above-mentioned radial ball bearing retainer is used, the lubricant is held by the lubricant reservoir provided on the annular inner diameter surface, and the lubricant is retained from the lubricant reservoir during rotation of the bearing. The lubricant can be sufficiently supplied between the pocket and the ball, and the film breakage of the lubricant can be suppressed between the pocket and the ball. For this reason, it is possible to prevent problems such as ball burning, noise generation, and rotational torque increase.

  In the radial ball bearing, a radius ratio (r ′ / D) between a groove radius (r ′) of at least one of the inner ring raceway surface and the outer ring raceway surface and a diameter (D) of the ball may be 52% or less. preferable. As a result, the area of the inner ring raceway surface and / or outer ring raceway surface that comes into contact with the ball is increased, and the stress on the grooves on the raceway surface is reduced, so that a high load on the bearing can be realized.

  In addition, it is preferable that grease is filled as the lubricant, and the condition of the grease (an index indicating the viscosity of the grease) is in the range of 200 to 280.

  According to the radial ball bearing retainer and the radial ball bearing of the present invention, the lubricant can be sufficiently supplied from the lubricant reservoir portion between the pocket and the ball during the rotation of the bearing. In the meantime, the film breakage of the lubricant can be suppressed.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

<First Embodiment>
FIG. 1 is a perspective view of a radial ball bearing retainer according to a first embodiment. 2 is a cross-sectional view of the main part of the radial ball bearing retainer shown in FIG. 1 cut along the line II-II in FIG. 3 is a cross-sectional view of the main part of the radial ball bearing retainer of FIG. 1 cut in the direction of the line III-III of FIG.

  The cage 20 according to the present embodiment shown in FIGS. 1 and 2 is a crown type cage that is formed in an annular shape and provided with a plurality of pockets 18 in the circumferential direction. 4 and is used for a radial ball bearing as shown in FIG. 4, the parts corresponding to those in FIG.

  As shown in FIGS. 1 and 2, the cage 20 includes a plurality of pockets 18 formed at equal intervals in the circumferential direction of the annular main portion 17 between the outer diameter surface 27 and the inner diameter surface 28. Each pocket 18 has an opening T into which the ball 5 is pushed when the bearing is assembled, and a concave surface portion 29 in which the pushed ball 5 is positioned and held.

  As shown in FIGS. 1 and 2, the concave portion 29 of the pocket 18 is provided on the bottom side facing the opening T at the bottom of the figure and has a radius R1 (R1> r (r: A first spherical concave surface portion 21 having a radius of the ball 5)) and a radius R2 (R2) centered on the center O of the ball 5 provided in the vicinity of the claw-like portions 16a, 16b on both sides of the opening T in the upper part of the figure > R) and provided at each intermediate portion between the first spherical concave surface portion 21 and the second spherical concave surface portion 23, 23, with the rolling center axis v of the ball 5 as the center. And cylindrical concave surface portions 22 and 22 configured in a cylindrical surface shape.

  As shown in FIGS. 1 and 3, the pair of claw-like portions 16 a and 16 b rises in a curved shape slightly inclined from the surface 26 of the columnar portion of the annular main portion 17 toward the pocket 18 on both sides of the pocket 18. Configured. The inside of the columnar portion of the main portion 17 is a so-called meat stealing portion, and a cavity 29 is formed.

  As shown in FIGS. 1 and 3, the annular inner diameter surface 28 of the cage 20 is provided with a lubricant reservoir 25 and is configured in a groove shape so as to extend in the circumferential directions s and s ′ of the inner diameter surface 28. ing.

  1 and 3, the lubricant reservoir 25 is a groove that is recessed so as to have a width from a position directly below the surface 26 of the columnar portion to a position substantially the same as the bottom of the pocket 18. Yes.

  Further, the lubricant reservoir 25 is intermittently positioned in the circumferential direction s, s ′ of the inner diameter surface 28 because the pockets 18 exist and is not continuously formed. For this reason, the lubricant reservoir 25 is located on both sides of each pocket 18, and the lubricant reservoir 25 is composed of a part of the first spherical concave portion 21 of the concave portion 29 and the cylindrical concave portion 22. It is connected in a state of being recessed to some extent.

  Therefore, the lubricant such as grease held in the lubricant reservoir 25 of the cage 20 is rotated in the direction s ′ or s opposite to the rotation direction when the cage 20 rotates in the rotation direction s or s ′ during the bearing rotation. It can move and enter between the concave surface portion 29 of the pocket 18 and the ball 5. For this reason, the lubricant can be sufficiently supplied between the concave portion 29 of the pocket 18 and the ball 5.

  As described above, according to the radial ball bearing retainer 20 of FIGS. 1 to 3, the radial ball bearing similar to that of FIG. 4 is used, and a lubricant such as grease is provided on the inner diameter surface 28 of the retainer 20. The lubricant can be held in the lubricant reservoir 25, and the lubricant is sufficiently supplied from the lubricant reservoir 25 between the concave portion 29 of the pocket 18 and the ball 5 with the rotation of the cage 20 during the rotation of the bearing. Therefore, the film breakage of the lubricant between the pocket 18 and the ball 5 can be suppressed, and the lubricity in the pocket 18 is improved. For this reason, it is possible to prevent problems such as seizure of the balls 5 in the cage 20, generation of noise, and increase in rotational torque.

  1 to 3 can be manufactured by injection molding from a resin using a molding die.

<Second Embodiment>
FIG. 9 is a sectional view (a) of a radial ball bearing (showing each ring and ball when the radius ratio is 52% or less) according to the second embodiment and a conventional radial ball bearing (with a radius ratio of 52%). It is sectional drawing (b) of each raceway ring and ball at the time of exceeding. In addition, in FIG. 9, illustration of the holder | retainer is abbreviate | omitted for convenience of explanation.

  The cage 20 shown in FIGS. 1 and 2 holds a plurality of balls 5 in each pocket 18 and is incorporated in a radial ball bearing. That is, as shown in FIG. 9A, the radial ball bearing 50 according to the present embodiment includes an outer ring 4 having an outer ring raceway surface 51, an inner ring 2 having an inner ring raceway surface 52, a plurality of balls 5, A cage 20 for holding each ball 5 in each pocket 18 at a uniform position so as to roll freely, and a plurality of balls 5 are arranged between the inner ring raceway surface 52 and the outer ring raceway surface 51 so as to roll freely. It is a thing.

  In the radial ball bearing 50 of FIG. 9A, the inner ring raceway surface 52 of the inner ring 2 has a groove shape having a groove radius r52, and the radius ratio (r52) between the groove radius r52 and the diameter D of the ball 5 / D) is 52% or less. Similarly, the outer ring raceway surface 51 of the outer ring 4 has a groove shape having a groove radius r51, and the radius ratio (r51 / D) between the groove radius r51 and the diameter D of the ball 5 is 52% or less.

  As described above, in the radial ball bearing 50 according to the present embodiment, each radius ratio between the groove radius r52 of the inner ring raceway surface 52 of the inner ring 2 and the groove radius r51 of the outer ring raceway surface 51 of the outer ring 4 and the diameter of the ball 5 ( r52 / D, r51 / D) is made smaller than 52% applied in the conventional case as shown in FIG. 9B, thereby reducing the stress on the grooves of the raceway surfaces 51, 52 with which the balls 5 come into contact. is doing.

  That is, in the case of FIG. 9B, the radius ratio (r11 / D) between the groove radius r11 of the inner ring raceway surface 1 and the diameter D of the ball 5 exceeds 52%, and similarly the groove radius r13 of the outer ring raceway surface 3 The radius ratio (r13 / D) with the diameter D of the ball 5 exceeds 52%. For this reason, since the area which contacts the ball 5 becomes small in each track surface 1, 3, the stress on the groove of each track surface 1, 3 becomes large, whereas FIG. ), The respective radius ratios (r52 / D, r51 / D) are 52% or less, and the areas in contact with the balls 5 on the inner ring raceway surface 52 and the outer ring raceway surface 51 are increased. The stress on the groove 52 is reduced. For this reason, the radial ball bearing 50 of this Embodiment can achieve a high load because a high load is possible in the applied bearing device.

  In addition, it is preferable that each above-mentioned radius ratio (r52 / D, r51 / D) is 50% or more.

  The radial ball bearing 50 shown in FIG. 9A is used with a lubricant filled in the bearing, but it is preferable to use grease as the lubricant. In this case, the grease condition (an index indicating the viscosity of the grease) is used. ) Is preferably in the range of 200 to 280. When using relatively hard grease as a lubricant in this way, if the cage pocket shape is a single spherical shape, it will easily return to the pocket once the grease is pushed out of the pocket while the bearing is in use. Although it is difficult to cause poor lubrication in the cage, according to the radial ball bearing 50 of the present embodiment, a spherical concave surface is formed between the pocket 18 and the ball 5 of the cage 20 as shown in FIG. Grease reservoirs A and B are formed in the vicinity of the boundary between the portion 21 and the cylindrical concave surfaces 22 and 22 and in the vicinity of the boundary between the cylindrical concave surfaces 22 and 22 and the spherical concave surfaces 23 and 23, respectively. Further, the grease is held in the holding grease reservoirs A and B, and is difficult to be pushed out from the pocket 18, and is easily returned to the pocket 18 even if pushed out. It is possible to exert a lubricating performance due to maintenance. Similarly, in FIG. 6 described later, grease reservoirs A ′ and B ′ are formed in the same manner, and the lubricating performance by the grease can be similarly exhibited and maintained.

  As described above, the best mode for carrying out the present invention has been described. However, the present invention is not limited to these, and various modifications are possible within the scope of the technical idea of the present invention. For example, as shown in FIG. 6, in the concave surface portion 29 of the pocket 18, the center of the radius R1 of the first spherical concave surface portion 21 is shifted from the center O of the ball 5 to O1 to make the radius R3 larger than the radius R1. For the two spherical concave portions 23, 23, the center of the radius R2 may be shifted from the center O of the ball 5 to O2, and the radius R4 may be larger than the radius R2.

  Further, as shown in FIG. 7, almost the entire concave surface portion 29 of the pocket 18 may be a spherical concave surface portion having a radius R0 (R0> r) centered on the center O of the ball 5.

  Further, in FIG. 1, the lubricant reservoir 25 is formed in a continuous groove shape between the pocket 18 and the pocket 18 adjacent thereto, but the present invention is not limited to this, for example, as shown in FIG. On the inner diameter surface 28 of the container 20, a groove that is not continuous and divided between the pocket 18 and the adjacent pocket 18 may be formed on the pocket 18 side to constitute the lubricant reservoirs 25 a and 25 b.

It is a perspective view of the retainer for radial ball bearings by a 1st embodiment. FIG. 2 is a cross-sectional view of an essential part of the radial ball bearing retainer of FIG. 1 cut along the line II-II in FIG. 1. FIG. 3 is a cross-sectional view of an essential part of the radial ball bearing retainer of FIG. 1 cut along the line III-III in FIG. 1. It is the perspective view which fractured | ruptured partially in order to show the internal structure of the conventional radial ball bearing roughly. It is a perspective view which shows the conventional resin-made crown type holder | retainer which can be arrange | positioned at the radial ball bearing of FIG. It is a figure which shows the modification of the holder | retainer of FIGS. 1-3, Comprising: It is a figure similar to FIG. It is a figure which shows another modification of the holder | retainer of FIGS. 1-3, Comprising: It is a figure similar to FIG. It is a figure which shows another modification of the holder | retainer of FIGS. 1-3, Comprising: It is a figure similar to FIG. Sectional view (a) of a radial ball bearing according to the second embodiment (showing each ring and ball when the radius ratio is 52% or less) and a conventional radial ball bearing (when the radius ratio exceeds 52%) It is sectional drawing (b) of each bearing ring and ball of (shown).

Explanation of symbols

2 Inner ring 4 Outer ring 5 Ball 50 Radial ball bearing 51 Outer ring raceway surface 52 Inner ring raceway surface 16a, 16b Elastic piece, claw-like part 17 Main part 18 Pocket 20 Cage for radial ball bearing, Cage 21 First spherical concave part 22 Cylinder Concave surface portion 23 Second spherical concave surface portion 25 Lubricant reservoir portion 25a, 25b Lubricant reservoir portion 27 Outer surface 28 Inner surface 29 Concave portion O Center of ball 5 T Opening portion v Rolling center axis D Diameter of ball 5 r52 Groove radius of inner raceway surface 52 r51 Groove radius of outer raceway surface 51 A, B, A ′, B ′ Grease reservoir

Claims (7)

This is a radial ball bearing cage in which a plurality of balls arranged between the raceway surfaces of a radial ball bearing are formed in an annular shape and pockets are provided at a plurality of locations in the circumferential direction so as to be able to roll. And
A retainer for a radial ball bearing, wherein a lubricant reservoir is provided on the annular inner surface.   The radial ball bearing retainer according to claim 1, wherein the lubricant reservoir portion is formed in a groove shape so as to extend in a circumferential direction of the inner diameter surface and is connected to the pocket.   The radial ball bearing retainer according to claim 1 or 2, wherein the lubricant reservoir is intermittently positioned in the circumferential direction of the inner diameter surface due to the presence of the pockets.   The radial ball bearing retainer according to claim 1, 2 or 3, wherein each pocket is capable of supplying a lubricant from the lubricant reservoirs adjacent to each other.   An inner ring having an inner ring raceway surface on an outer peripheral surface and an outer ring having an outer ring raceway surface on an inner peripheral surface are arranged concentrically with each other, and any one of claims 1 to 4 between the inner ring raceway surface and the outer ring raceway surface. A radial ball bearing characterized in that a plurality of balls are held using the radial ball bearing retainer described in item 1 and a lubricant is filled inside the bearing.   The radial according to claim 5, wherein a radius ratio (r '/ D) between a groove radius (r') of at least one of the inner ring raceway surface and the outer ring raceway surface and a diameter (D) of the ball is 52% or less. Ball bearing. Filled with grease as the lubricant,
The radial ball bearing according to claim 5 or 6, wherein the grease has a degree of adjustment in a range of 200 to 280.

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