JP2008261478A - Radial ball bearing cage and radial ball bearing - Google Patents

Abstract

To provide a radial ball bearing retainer and a radial ball bearing capable of sufficiently supplying a lubricant between a ball and a concave surface portion of a pocket without increasing the filling amount of the lubricant.
A radial ball bearing retainer 20 is formed in an annular shape as a whole in order to hold a plurality of balls 5 arranged between raceway surfaces of a radial ball bearing so as to be freely rotatable. A pocket 18 is provided at a plurality of locations, and the pocket has a concave surface portion 19 where a ball is located, and a hollow portion 21, 22, 23 is provided in a column portion 29 between adjacent pockets. Communication holes 21a, 21b, 22b, and 23a are provided.
[Selection] Figure 1

Description

  The present invention relates to a radial ball bearing retainer and a radial ball bearing that rotatably hold a plurality of balls arranged between raceway surfaces of the radial ball bearing.

  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. In each pocket 18, a concave surface portion 19 formed from the space between the pair of elastic pieces 16 a and 16 b disposed at a distance from each other in the main portion 17 toward the bottom portion is substantially spherical. 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

  FIG. 6 is a view of the main part of the cage 6 of FIG. 5 as viewed from the outside in the radial direction. When the cage 6 is used in the radial ball bearing 10 of FIG. 4 with the ball 5 indicated by a two-dot chain line held in the pocket 18, the ball 5 moves in the pocket 18 of the cage 6 as the bearing rotates. Rolling (spinning) is performed about the rolling center axis v. At this time, a lubricant such as grease filled in the bearing is scraped by contact between the balls 5 and the end portion 19a of the concave surface portion 19 of the pocket 18. Due to the fact that it is taken out, it becomes difficult for the lubricant to accumulate in the pocket 18.

  For this reason, for example, a film of lubricant G is only partially formed between the ball 5 and the concave surface portion 19 of the pocket 18 as shown by a broken line in FIG. As a result, the wear of the pocket 18, the seizure of the balls 5, and the generation of noise are likely to occur. Further, in order to sufficiently supply the lubricant between the balls 5 and the concave surface portion 19, it is conceivable to increase the filling amount of the lubricant into the bearing. However, if this is done, the stirring resistance of the lubricant inside the bearing is reduced. It will increase, leading to an increase in rotational torque.

  SUMMARY OF THE INVENTION In view of the above-described problems of the prior art, the present invention provides a radial ball bearing retainer and a radial bearing capable of sufficiently supplying a lubricant between the balls and the concave surface portion of the pocket without increasing the amount of lubricant filling. The object is to provide a ball bearing.

  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 pocket is provided at a plurality of locations in the circumferential direction, and the pocket is a radial ball bearing retainer having a concave portion where the ball is located, and a hollow portion is provided in a column portion between adjacent pockets, and the concave surface A communication portion that communicates the portion and the hollow portion is provided.

  According to this radial ball bearing retainer, the lubricant is filled in the cavity by using it in the radial ball bearing, so that, as the bearing rotates, the lubricant passes from the cavity to the concave portion of the pocket through the communicating portion. Therefore, a sufficient amount of lubricant can be supplied between the ball and the concave surface portion of the pocket, and a lubricant film can be formed without interruption between the ball and the concave surface portion. There is no need to increase the filling amount of the lubricant.

  In the radial ball bearing retainer, the hollow portion is opened on a surface opposite to the opening of the pocket. The hollow portion can be formed as a so-called meat stealing portion.

  In addition, by providing a lid member that closes the cavity, the lubricant filled in the cavity can be prevented from leaking outside the cage, and the amount of lubricant necessary for lubricating the bearing can be prevented from being insufficient. it can.

  Moreover, it is preferable that the said communication part is formed so that it may face substantially the center of the ball | bowl located in the said concave surface part. Further, the communication portion may be formed so as to substantially face the circumferential direction of the cage.

  Further, the cavity is provided so as to be adjacent to the two pockets, and each cavity is configured to communicate with each concave portion of the two adjacent pockets. Lubricant can be supplied from the hollow portion. In addition, you may comprise so that each cavity part may be connected to the concave-surface part of one adjacent pocket.

  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, A plurality of balls are held using the above-mentioned radial ball bearing retainer, the inside of the cavity of the retainer is filled with a lubricant, and the cavity is used as a lubricant reservoir.

  According to this radial ball bearing, the above-described radial ball bearing retainer is used, and the lubricant is filled from the cavity into the lubricant storage portion by filling the cavity with the lubricant. Is supplied to the concave portion of the pocket through, it becomes possible to sufficiently supply the lubricant between the ball and the concave portion of the pocket, and the lubricant film can be formed without interruption between the ball and the concave portion. Therefore, it is not necessary to increase the filling amount of the lubricant.

  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 between the ball and the concave surface portion of the pocket without increasing the filling amount of the lubricant.

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

  <First Embodiment>

  FIG. 1 is a view of a main part of a radial ball bearing retainer according to the first embodiment as viewed from the outside in the radial direction. FIG. 2 is a view of the main part of the cage of FIG. 1 as viewed from the direction II.

  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, 2, and 5, the cage 20 has a plurality of pockets formed at equal intervals in the circumferential direction of the annular main portion 17 between the outer peripheral portion 27 and the inner peripheral portion 28. As shown in FIG. 1, each pocket 18 has a spherical concave surface portion 19 in which the ball 5 indicated by a two-dot chain line is located.

  As shown in FIG. 1, the main portion 17 is configured as a column portion 29 between each pocket 18 and the adjacent pocket 18 below the elastic pieces 16 a and 16 b. Cavities 21, 22, and 23 are formed as so-called meat stealing parts inside each column part 29, and each of the cavities 21 to 23 is connected to the outer peripheral part 27 and the inner peripheral part on the back surface 26 of the cage 20. 28 is opened at substantially rectangular openings 21c, 22c, 23c extending in the circumferential direction s, s ′ in the cage circumferential direction at the approximate center in the width direction.

  Each of the hollow portions 21 to 23 has a substantially trapezoidal shape with the opening 21c, 22c, and 23c side as a base when viewed from the radial direction in FIG. 1, and the oblique sides 21d, 21e, 22e, and 23d are spherical surfaces. It is a convex surface portion that swells toward the hollow portions 21 to 23 substantially along the concave surface portion 19.

  Communication holes 21 a, 21 b, 22 b, and 23 a are formed through the convex surface portions 21 d, 21 e, 22 e, and 23 d in the hollow portions 21 to 23 so as to communicate with the concave surface portions 19 of the pockets 18. Each communication hole 21 a, 21 b, 22 b, 23 a is provided so as to substantially face the center of the ball 5 located in the concave surface portion 19.

  As described above, in the same manner as the hollow portion 21 provided with the two communication holes 21a and 21b, each of the hollow portions in the column portion 29 between the other pockets 18 and 18 has two communication holes. Yes.

  The radial ball bearing retainer 20 shown in FIGS. 1 and 2 is used in a state where the balls 5 are held in the pockets 18 of the retainer 20 in a radial ball bearing similar to that shown in FIG. For example, as shown by the broken line in FIG. 1, the radial ball bearing rotates and the ball 5 and the cage in the circumferential direction s in FIG. When 20 rotates, the lubricant is pressed into the convex surface portion 21d side of the oblique side in the cavity portion 21 and the convex surface portion 23d side of the cavity portion 23 in the direction opposite to the rotation direction s, and enters the communication holes 21a and 23a. Thus, an appropriate amount of the lubricant can be caused to be miserable in the concave surface portion 19 of each pocket 18.

  As described above, with the rotation of the radial ball bearing, the lubricant can be automatically supplied from the hollow portions 21 and 23 as the lubricant storage portions to the concave surface portion 19 of the pocket 18 through the communication holes 21a and 23a. 5 and the concave surface portion 19 of the pocket 18 can be sufficiently supplied, and the lubricant film can be formed between the balls 5 and the concave surface portion 19 without interruption. For this reason, it is possible to prevent wear of the pocket 18, seizure of the balls 5, generation of noise, and the like in the cage 20.

  Further, since the lubricant can be sufficiently supplied between the ball 5 and the concave surface portion 19, it is not necessary to increase the amount of the lubricant, and the agitation of the lubricant inside the bearing caused by the increase in the amount of the lubricant is increased. There is no problem of increased resistance or increased rotational torque.

  In addition, in FIG. 1, when the ball 5 and the cage 20 are rotated in the direction s ′ opposite to the circumferential direction s due to the rotation of the radial ball bearing, the convex surface of the hypotenuse in the cavity 21 at the position opposite to the rotation direction s ′. The lubricant is pressed into the portion 21 e side and the convex surface portion 22 e side in the cavity portion 22 and enters the communication holes 21 b and 22 b, so that an appropriate amount of lubricant can be caused to erode in the concave portion 19 of each pocket 18. it can.

  Therefore, the radial ball bearing retainer 20 shown in FIGS. 1 and 2 is suitable for use in a bidirectional ball bearing that rotates in both the rotational directions s and s ′. When the cage 20 is used for a unidirectional rotation type radial ball bearing that rotates in either the rotation direction s or s ′, one of the communication holes 21a and 21b in the cavity portion 21 can be omitted. is there.

  <Second Embodiment>

  FIG. 3 is a view of the main part of the radial ball bearing retainer according to the second embodiment as viewed from the outside in the radial direction.

  3 has the same configuration as that of FIGS. 1 and 2, but the openings 21c, 22c, and 23c (FIG. 2) of the cavities 21, 22, and 23 on the back surface 26 side are plate-shaped lids. Closed by the members 31, 32, 33, the cavities 21, 22, 23 are closed.

  According to the radial ball bearing retainer 30 of FIG. 3, it is possible to obtain the same effects as those of FIGS. 1 and 2 described above, and the cavities 21, 22 and 23 are closed by the lid members 31, 32 and 33. Therefore, when the radial ball bearing rotates, the lubricant such as grease filled in the cavities 21, 22, and 23 can be prevented from leaking out of the cage 30. As a result, it is possible to prevent the lubricant stored in each of the cavities 21, 22, and 23 from leaking during rotation and the amount of lubricant necessary for bearing lubrication from being insufficient.

  The cages 20 and 30 having the pockets 18 as shown in FIGS. 1 to 3 can be molded from resin by injection molding using a molding die.

  <Third Embodiment>

  FIG. 9 is a cross-sectional view (a) of a radial ball bearing according to the third embodiment (showing each ring and ball when the radius ratio is 52% or less) and a conventional radial ball bearing (with a radius ratio of 52%). It is sectional drawing (b) of each track ring and ball at the time of exceeding. In FIG. 9, the cage is not shown for convenience of explanation.

  The cages 20 and 30 shown in FIGS. 1 and 3 are incorporated in a radial ball bearing while holding a plurality of balls 5 in each pocket 18. 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 (or 30) 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 rolled between the inner ring raceway surface 52 and the outer ring raceway surface 51. It is arranged freely.

  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, the cages 20 and 30 have the hollow portions 21 to 23 as shown in FIGS. In addition, since the grease is held in the cavities 21 to 23 and is difficult to be pushed out from the pocket 18, the lubrication performance by the grease can be exhibited and maintained.

  Further, when a later-described cage 40 of FIG. 8 is used in the radial ball bearing 50, a spherical concave surface portion 41 and a cylindrical concave surface portion are provided between the pocket 18 and the ball 5 of the cage 40 as shown in FIG. Grease reservoirs A and B are formed in the vicinity of the boundary between 42 and 42 and in the vicinity of the boundary between the cylindrical concave surface portions 42 and 42 and the spherical concave surface portions 43 and 43, respectively, and the grease is also retained in the grease reservoir portions A and B. Thus, it is difficult to be pushed out from the pocket 18 and it is easy to return to the pocket 18 even if pushed out, so that the lubricating performance by the grease can be 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, in the cages 20 and 30 of FIGS. 1 and 3, the communication holes 21 a, 21 b, 22 b, and 23 a penetrate from the cavities 21, 22, and 23 toward the center O of the ball 5 in the pocket 18. However, the present invention is not limited to this, and communication holes 51a, 51b, 52b, and 53a are provided so as to penetrate in the same direction as the circumferential directions s and s' as shown in FIG. Also good.

  Moreover, in FIG.1, FIG.3, FIG.7, although substantially the whole concave surface part 19 of each pocket 18 of a holder | retainer was comprised in spherical shape, this invention is not limited to this, It is like the holder | retainer 40 of FIG. In addition, the overall shape of the concave surface portion 19 of the pocket 18 is a spherical concave surface portion 41 having a radius R1 (R1> r (r: radius of the ball 5)) with the bottom at the bottom in the figure centering on the center O of the ball 5. The upper part with the opening T is the spherical concave parts 43 and 43 having the radius R2 (R2> r) with the center O of the ball 5 as the center, and the spherical concave part 41 and the spherical concave parts 43 and 43 You may comprise so that each intermediate part may be the axial cylindrical concave-surface parts 42 and 42 centering on the rolling center axis | shaft v of the ball | bowl 5. FIG. Further, as shown by a broken line in the right pocket 18 in FIG. 8, the radius R1 of the spherical concave surface portion 41 is shifted from the center O of the ball 5 to O1 on the rolling center axis v to increase the radius R1 to increase the radius R3. (R3> R1) and the center of the radius R2 of the spherical concave surface portion 43 is shifted from the center O of the ball 5 to O2 on the rolling center axis v to increase the radius R2 and set the radius R4 (R4> R2). Good.

It is the figure which looked at the principal part of the radial ball bearing retainer by a 1st embodiment from the radial outside. It is the figure which looked at the principal part of the holder | retainer of FIG. 1 from the direction II. It is the figure which looked at the principal part of the retainer for radial ball bearings by a 2nd embodiment from the radial outside. 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 the figure which looked at the principal part of the holder | retainer of FIG. 5 from the radial direction outer side. It is the figure which looked at the principal part of the modification of the radial ball bearing retainer of FIG. 1 from the radial direction outer side. It is the figure which looked at the principal part of another modification of the retainer for radial ball bearings of Drawing 1 from the radial outside. Sectional view (a) of a radial ball bearing according to the third 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 18 Pocket 19 Concave part 20 Radial ball bearing retainer, retainer 21, 22, 23 Cavity 21a, 21b, 22b , 23a Communication hole (communication part)
21c, 22c, 23c Opening portion 26 Back surface 29 Column portion 30, 40 Radial ball bearing retainer, retainer 31, 32, 33 Lid member 41 Spherical concave surface portion 42 Axial cylindrical concave surface portion 43 Spherical concave surface portion 51a, 51b, 52b , 53a Communication hole G Lubricant O Ball center T Opening s, s' Circumferential direction of cage, rotation direction D Diameter of ball 5 r52 Groove radius of inner ring raceway surface r51 Groove radius of outer ring raceway surface 51, B Grease reservoir

Claims (9)

In order to hold the plurality of balls arranged between the raceway surfaces of the radial ball bearings in a freely rolling manner, the whole is formed in an annular shape, and pockets are provided at a plurality of locations in the circumferential direction. A radial ball bearing retainer having a concave surface,
A hollow portion is provided in a column portion between adjacent pockets,
A radial ball bearing retainer comprising a communication portion that communicates the concave surface portion with the hollow portion.   The radial ball bearing retainer according to claim 1, wherein the hollow portion opens on a surface opposite to the opening of the pocket.   The radial ball bearing retainer according to claim 1, further comprising a lid member that closes the cavity.   The radial ball bearing retainer according to any one of claims 1 to 3, wherein the communication portion is formed so as to substantially face a center of a ball positioned on the concave surface portion.   The radial ball bearing retainer according to any one of claims 1 to 3, wherein the communication portion is formed so as to substantially face the circumferential direction of the retainer. The hollow portions are respectively provided adjacent to the two pockets,
The radial ball bearing retainer according to any one of claims 1 to 5, wherein each hollow portion communicates with each concave surface portion of the two adjacent pockets. 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 6 between the inner ring raceway surface and the outer ring raceway surface. A plurality of balls are held using the radial ball bearing retainer described in item 1,
A radial ball bearing, wherein the cavity of the cage is filled with a lubricant, and the cavity is used as a lubricant reservoir.   The radial ratio according to claim 6, 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 7 or 8, wherein the grease has an adjustment in a range of 200 to 280.

Images