JP2008261482A - Radial ball bearing cage and radial ball bearing - Google Patents

Abstract

A radial ball bearing retainer and a radial ball bearing capable of improving the lubricity by suppressing the film breakage of a lubricant between a pocket and a ball of the cage.
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. Pockets 18 are provided at a plurality of locations, each pocket has an opening into which the ball is pushed, and a concave surface portion where the ball is positioned, and the concave surface portion 29 is formed in a spherical shape on the bottom surface side facing the opening. 1 spherical concave surface portion, a second spherical concave surface portion formed spherically on the opening side, and a cylindrical shape centering on the rolling center axis of the ball between the first spherical concave surface portion and the second spherical concave surface portion An axial cylindrical concave surface portion 22, and the concave surface portion further includes a lubricant reservoir portion 24 provided at least in a circumferential direction for holding the lubricant, and a vicinity of the lubricant reservoir portion. And ball holding portions 25 and 26 for holding balls.
[Selection] Figure 2

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 rotary machine devices. A schematic configuration of a conventional example of this radial ball bearing is shown in FIG. 9 (Patent Documents 1, 2, and 3 below). reference). The radial ball bearing 10 of FIG. 9 has an inner ring 2 with an inner ring raceway surface 1 formed on the outer peripheral surface and an outer ring 4 with an outer ring raceway surface 3 formed on the 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. 10 is a perspective view of the cage 6 of FIG.

  As shown in FIG. 10, 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). 10 includes a pocket 18 provided to hold a ball 5 (FIG. 9) so as to roll freely at a plurality of locations in the circumferential direction of an annular main portion 17, 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. 9 is assembled using the crown type cage 6 of FIG. 10, the ball 5 is connected between the tip edges of the pair of claw-like elastic pieces (claw-like portions) 16 a and 16 b of the pocket 18. The gap is elastically expanded and inserted so as to be pushed in from the opening T between the elastic pieces 16a and 16b. Thus, the crown type 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. 9). .

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. 11 shows a cross-sectional view of the main part of the retainer 6 of FIG. 10 cut in the XI-XI line direction, and FIG. 12 shows a top view of the main part of the retainer of FIG. 10 viewed from above the opening. The radial ball bearing as shown in FIG. 9 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. A lubricant film is formed.

  However, the conventional resin cage 6 as shown in FIG. 10 has a spherical shape with a radius R0 centering on the center O of the ball 5 as shown in FIGS. When the ball 5 rolls (rotates) around the rotation center axis v (FIG. 11) and rotates in the rotation direction x (FIG. 12) during rotation, the lubricant such as grease attached to the surface of the ball 5 is pocketed. 18 is easily scraped off at the end D, and the lubricant is not sufficiently supplied between the pocket 18 and the ball 5 during rotation of the bearing, and the lubricant film is likely to be broken. This results in poor lubrication, causing problems such as so-called ball burning and increased rotational torque, resulting in a reduction in bearing life.

  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 ball bearing capable of improving lubricity by suppressing the film breakage of the lubricant between the cage pocket and the ball. The purpose is to provide.

  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 each pocket is a radial ball bearing retainer having an opening into which the ball is pushed, and a concave surface portion where the ball is located, the concave surface portion being A first spherical concave surface formed in a spherical shape on the bottom side facing the opening, a second spherical concave surface formed in a spherical shape on the opening side, the first spherical concave surface, and the second spherical concave surface An axial cylindrical concave surface portion formed in a cylindrical shape around the rolling center axis of the ball, and the concave surface portion further includes at least a circumferential direction for retaining a lubricant. A lubricant reservoir provided in part, and the lubricant reservoir And Ball holder for holding the ball in the vicinity of the Ri portion, characterized in that it comprises a.

  This radial ball bearing retainer is used for a radial ball bearing. When the ball rolls (rotates) in the pocket during rotation of the bearing, the axial cylindrical concave surface portion, the first spherical concave surface portion, the second Lubricant can be prevented from being scraped off at the end of the concave surface portion in the vicinity of each boundary with the spherical concave surface portion, and the lubricant can be held, and the lubricant is further provided in the lubricant reservoir portion provided in the circumferential direction of the concave surface portion. Thus, the effect of retaining the lubricant in the pocket can be improved. For this reason, the lubricant is sufficiently supplied between the pocket and the ball of the cage, and the film breakage of the lubricant between the pocket and the ball can be suppressed and the lubricity can be improved. Further, since the ball can be held by the ball holding portion in the vicinity of the lubricant reservoir portion, even if the lubricant reservoir portion is provided on the concave surface portion of the pocket, the ball can be reliably held throughout the pocket concave portion. Further, the acoustic performance (silence) of the bearing is improved by the damper effect of the retained lubricant.

  In the radial ball bearing retainer, it is preferable that a plurality of the lubricant reservoirs are provided in the form of grooves shifted in the width direction of the pocket (radial direction of the retainer), thereby improving the retaining effect of the lubricant. To do.

  Further, it is preferable that the lubricant reservoir is configured in a groove shape at a substantially center in the width direction of the pocket.

  In addition, each groove-like lubricant reservoir part described above may be provided on substantially the entire circumference of the concave surface part, or may be provided on a part thereof.

  Further, the lubricant reservoirs are respectively provided on the outer diameter side and the inner diameter side of the cage, and the ball holding part is provided at the approximate center in the width direction of the pocket. The ball is held by the center ball holding portion, and the ball is not held on the outer diameter surface side and inner diameter surface side of each lubricant reservoir provided on the outer diameter surface side and inner diameter surface side of the cage. Even if the lubricant is scraped off at the edge of the central ball holding portion, the scraped lubricant can be held at each lubricant reservoir located outside.

  Further, the ball holding effect can be increased by configuring the ball holding portion to be provided at the approximate center in the width direction of the pocket.

  In the above-described case, for example, lubrication is performed between the ball holding portion near the outer diameter surface and the substantially central ball holding portion, and between the ball holding portion near the inner diameter surface and the substantially central ball holding portion, respectively. An agent reservoir can be provided.

  Moreover, the said ball | bowl holding | maintenance part can be comprised so that it may be provided in each vicinity of the outer diameter surface and inner diameter surface of the said holder | retainer.

  In the above-described case, it is preferable that at least one of the outer diameter surface side and the inner diameter surface side is configured in a curved shape with respect to each ball holding portion provided in the vicinity of each of the outer diameter surface and the inner diameter surface. It is possible to further suppress the scraping of the lubricant at the end portion.

  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, by using the above-described radial ball bearing retainer, when the ball rolls (rotates) in the pocket during rotation of the bearing, the axial cylindrical concave surface portion and the first spherical concave surface portion In addition, it is possible to prevent the lubricant from being scraped off at the end of the concave portion near each boundary with the second spherical concave portion, to hold the lubricant, and at the lubricant reservoir portion provided in the circumferential direction of the concave portion Further, since the lubricant can be retained, the effect of retaining the lubricant in the pocket can be improved. For this reason, the lubricant is sufficiently supplied between the pocket and the ball of the cage, and the film breakage of the lubricant between the pocket and the ball can be suppressed and the lubricity can be improved. Further, since the ball can be held by the ball holding portion in the vicinity of the lubricant reservoir portion, even if the lubricant reservoir portion is provided on the concave surface portion of the pocket, the ball can be reliably held throughout the pocket concave portion. Further, the acoustic performance (silence) of the bearing is improved by the damper effect of the retained 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 lubricity can be improved by suppressing the film breakage of the lubricant between the pocket of the cage and the ball.

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

<First Embodiment>
FIG. 1 is a cross-sectional view of an essential part of the radial ball bearing retainer according to the first embodiment cut in the same direction as the XI-XI line direction of FIG. 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.

  The cage 20 according to the present embodiment shown in FIGS. 1 and 2 is a crown type cage having a plurality of pockets 18 formed in an annular shape in the circumferential direction, and the overall shape is the cage shown in FIG. 9 and is used for a radial ball bearing as shown in FIG. 9, 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 and 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. Axial cylindrical concave surface portions 22 and 22 configured in a cylindrical surface shape.

  As shown in FIG. 1, in the vicinity of the boundary portion between the first spherical concave surface portion 21 and the axial cylindrical concave surface portion 22, a boundary vicinity portion A having a relatively large gap with the ball 5 is formed. Even in the vicinity of the boundary portion between the concave surface portion 23 and the axial cylindrical concave surface portion 22, a boundary vicinity portion B having a relatively large gap with the ball 5 is formed, and even if the ball 5 rotates, the boundary vicinity portions A and B It is difficult for the lubricant to be scraped off at the end of the concave surface portion 29, and the lubricant such as grease filled in the bearing can be held.

  As shown in FIG. 1, the pair of claw-like portions 16 a and 16 b are configured to rise slightly from the surface 17 a of the columnar portion of the annular main portion 17 toward the pocket 18 on both sides of the pocket 18. Has been. The inside of the columnar portion of the main portion 17 is a so-called meat stealing portion, and a cavity 17b is formed.

  As shown in FIG. 2, the concave surface portion 29 of the pocket 18 is provided with a lubricant reservoir portion 24 that extends in the circumferential direction of the concave surface portion 29 and is formed in a groove shape on substantially the entire circumference. The lubricant reservoir 24 includes a first spherical concave surface portion 21, an axial portion having a concave shape with a predetermined width at a substantially center in the width direction (radial direction of the cage 20) between the outer diameter surface 27 and the inner diameter surface 28 of the pocket 18. A cylindrical concave surface portion 22 and a second spherical concave surface portion 23 are formed.

  Further, the portion of the concave surface portion 29 where the lubricant reservoir portion 24 is not provided becomes ball holding portions 25 and 26 that hold the ball 5 when the ball 5 is received in the pocket 18. 25 and 26 are located in the vicinity of the lubricant reservoir 24. That is, the ball holding part 25 is located in the vicinity of the outer diameter surface 27, and the ball holding part 26 is located in the vicinity of the inner diameter surface 28.

  Even if the lubricant reservoir 24 is provided in the concave surface portion 29 of the pocket 18 by the ball holding portions 25 and 26, the ball 5 can be reliably held by the entire concave surface portion 29 of the pocket 18.

  The radial ball bearing retainer 20 shown in FIGS. 1 and 2 is used in a radial ball bearing as shown in FIG. 9 and is filled with a lubricant such as grease inside such a bearing. When the ball 5 rolls (rotates) about the rolling center axis v in the pocket 18 and rotates in the rotation direction x, the axial cylindrical concave surface portion 22, the first spherical concave surface portion 21, the second spherical surface Lubricant provided in the circumferential direction of the concave surface portion 29 while suppressing the scraping of the lubricant at the end portion of the concave surface portion 29 of each boundary vicinity portion A, B with the concave surface portion 23 and holding the lubricant. A lubricant can be further held in the pool portion 24. In this way, the lubricant is sufficiently supplied between the pocket 18 of the cage 20 and the balls 5, and the retention effect of the lubricant in the pocket 18 can be improved.

  Since the lubricant can be sufficiently supplied and held in the pocket 18 as described above, the film breakage of the lubricant between the pocket 18 and the ball 5 can be suppressed, and the lubricity in the cage 20 can be improved. It is possible to prevent the occurrence of problems such as so-called burning of balls 5, an increase in rotational torque, and a decrease in bearing life.

  Further, the acoustic performance (silence) of the bearing is improved by the damper effect of the lubricant held as described above.

  Further, since the balls 5 can be held by the ball holding portions 25 and 26 in the vicinity of the lubricant reservoir portion 24, even if the groove-like lubricant reservoir portion 24 is provided in the concave portion 29 of the pocket 18, the concave portion 29 of the pocket 18 is provided. The ball can be securely held throughout.

  Next, an example in which the positions and shapes of the lubricant reservoir and the ball holding portion in FIG. 2 are changed will be described with reference to FIGS. 3 to 7 show the respective modifications, and are main part sectional views similar to FIG.

  In the example of FIG. 3, in addition to the ball holding portions 25 and 26 located in the vicinity of the outer diameter surface 27 and in the vicinity of the inner diameter surface 28, the ball holding portion 33 is substantially at the center in the width direction of the concave portion 29 of the pocket 18. It is formed in a convex curved shape. As shown in FIG. 3, the ball holding portion 33 can be formed so that its cross-sectional shape has a circular shape with a radius r <b> 1 centering on a point p on a circumference a passing through the center of the cage 20 in the width direction.

  As shown in FIG. 3, a lubricant reservoir 31 is provided between the ball holding portion 33 and the ball holding portion 25 on the outer diameter surface 27 side, and the ball holding portion 33 and the ball holding portion 26 on the inner diameter surface 28 side. A lubricant reservoir portion 32 is provided between the first and second lubricant reservoir portions 31 and 32. The lubricant reservoir portions 31 and 32 are formed of a region where the ball holding portion 33 protrudes in a convex shape and is recessed in a curved shape.

  According to FIG. 3, in FIG. 2, a lubricant reservoir 24 is provided at the substantially center in the width direction of the concave portion 29 of the pocket 18, and the balls 5 on the outer diameter surface 27 side and the inner diameter surface 28 side other than the lubricant reservoir 24 are provided. 2 is added to the substantially central portion of the lubricant reservoir portion of FIG. 2, the ball holding portions 25, 26, and 34 further improve the ball holding effect.

  In the example of FIG. 4, lubricant reservoir portions 41 and 42 are provided on the outer diameter surface 27 side and the inner diameter surface 28 side, respectively, and a ball holding portion 43 is provided at the approximate center in the width direction between the lubricant reservoir portions 41 and 42. The ball 5 is held substantially at the center in the width direction other than the lubricant reservoirs 41 and 42.

  According to FIG. 4, the balls 5 are not held at the outer portions of the outer diameter surface 27 and the inner diameter surface 28 of the lubricant reservoirs 41 and 42, so that the lubricant adhering to the balls 5 is approximately the center ball in the width direction. Even if it is scraped off at the edge of the holding part 43, the lubricant scraped off by the lubricant reservoirs 41, 42 located outside the holding part 43 is held. Thereby, the retention effect of a lubricant can be obtained.

  In the example of FIG. 5, a lubricant reservoir 51 is further provided in the center of the ball holding portion 43 in FIG. 4 in the width direction, and between the lubricant reservoir 51 and the lubricant reservoir 41 on the outer diameter surface 27 side. A rounded convex ball holding portion 52 is provided, and a rounded convex ball holding portion 53 is provided between the lubricant reservoir portion 51 and the lubricant reservoir portion 42 on the inner diameter surface 28 side. It is.

  According to the example of FIG. 5, the lubricant retaining portion 51 is further provided at the approximate center in the width direction of the pocket 18, so that the effect of retaining the lubricant by the lubricant retaining portion is further improved.

  In the example of FIG. 6, the ball holding portion 26 located in the vicinity of the inner diameter surface 28 in FIG. 2 has an R shape and a curved ball holding portion 26 a. According to the example of FIG. 6, it is possible to effectively suppress the lubricant from being scraped off at the end of the pocket 18. In FIG. 6, the ball holding portion 25 located in the vicinity of the outer diameter surface 27 may have an R shape and may be a curved ball holding portion, and the same lubricant scraping suppressing effect can be obtained.

  In the example of FIG. 7, the ball holding portion 25 located in the vicinity of the outer diameter surface 27 and the ball holding portion 26 located in the vicinity of the inner diameter surface 28 in FIG. 2 have an R shape, and curved ball holding portions 25 a and 26 a, respectively. It is what.

  According to the example of FIG. 7, since the lubricant can be effectively suppressed from being scraped off at both ends of the pocket 18, the scraping suppression effect is further improved. 6 and 7 may be applied to FIG.

<Second Embodiment>
FIG. 13 is a cross-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 (with a radius ratio of 52%). It is sectional drawing (b) of each track ring and ball at the time of exceeding. In FIG. 13, the cage is not shown 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. 13A, the radial ball bearing 60 according to the present embodiment includes an outer ring 4 having an outer ring raceway surface 61, an inner ring 2 having an inner ring raceway surface 62, 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 62 and the outer ring raceway surface 61 so as to roll freely. It is a thing.

  In the radial ball bearing 60 of FIG. 13A, the inner ring raceway surface 62 of the inner ring 2 has a groove shape having a groove radius r62, and the radius ratio (r62) between the groove radius r62 and the diameter D of the ball 5 / D) is 52% or less. Similarly, the outer ring raceway surface 61 of the outer ring 4 has a groove shape having a groove radius r61, and the radius ratio (r61 / D) between the groove radius r61 and the diameter D of the ball 5 is 52% or less.

  As described above, in the radial ball bearing 60 according to the present embodiment, each radius ratio between the groove radius r62 of the inner ring raceway surface 62 of the inner ring 2 and the groove radius r61 of the outer ring raceway surface 61 of the outer ring 4 and the diameter of the ball 5 ( r62 / D, r61 / D) is made smaller than 52% applied in the conventional case as shown in FIG. 13B, thereby reducing the stress on the grooves of the raceway surfaces 61 and 62 with which the ball 5 contacts. is doing.

  That is, in the case of FIG. 13B, 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. 13 (a) of the present embodiment. ), The respective radius ratios (r62 / D, r61 / D) are 52% or less, and the areas in contact with the balls 5 on the inner ring raceway surface 62 and the outer ring raceway surface 61 are increased. The stress on the groove 62 is reduced. For this reason, the radial ball bearing 60 of the present embodiment can achieve a high load because a high load is possible in the applied bearing device.

  In addition, it is preferable that each said radius ratio (r62 / D, r61 / D) is 50% or more.

  The radial ball bearing 60 of FIG. 13 (a) 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 lubrication failure in the cage, according to the radial ball bearing 60 of the present embodiment, between the pocket 18 and the ball 5 of the cage 20 as shown in FIGS. The boundary vicinity portions A and B and the lubricant holding portion 24 are respectively formed, and the grease is held by the boundary vicinity portions A and B and the lubricant holding portion 24 so that it is difficult to be pushed out of the pocket 18. Even if it is pushed out, it is easy to return to the pocket 18, so that the lubricating performance by the grease can be exhibited and maintained.

  In addition, the lubricating performance by grease can be exhibited and maintained in the same manner in the configurations of FIGS. Further, the cage 20 may be configured as shown in FIG. 8 described later, and the grease is held in the boundary vicinity portions A ′ and B ′ and the lubricant holding portion 24, so that the lubricating performance by the grease is similarly exhibited and maintained. be able to.

  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 FIGS. 2 to 7, each lubricant reservoir is provided on substantially the entire circumference in the circumferential direction of the concave surface portion 19, but the present invention is not limited to this and is provided in a part of the circumferential direction of the concave surface portion 19. Alternatively, it may be divided and provided intermittently in the circumferential direction of the concave portion 19.

  8, the center of the radius R1 of the first spherical concave surface portion 21 of FIG. 1 is shifted from the center O of the ball 5 to O1 to make the radius R3 larger than the radius R1, and the second spherical concave surface portion 23. , 23, the center of the radius R2 may be shifted from the center O of the ball 5 to O2 to make the radius R4 larger than the radius R2.

  In FIG. 8, in the vicinity of the boundary portion between the first spherical concave surface portion 21 and the axial cylindrical concave surface portion 22, a boundary vicinity portion A ′ having a relatively large gap with the ball 5 is formed, and the second spherical concave surface Also in the vicinity of the boundary portion between the portion 23 and the axial cylindrical concave surface portion 22, a boundary vicinity portion B ′ having a relatively large gap with the ball 5 is formed. In the vicinity of the boundary portions A ′ and B ′, as in FIG. 1, even if the ball 5 rotates, the lubricant is hardly scraped off at the end of the concave surface portion 29 of the boundary vicinity portions A ′ and B ′. The lubricant such as grease filled in the bearing can be held.

  8, at least one of the center O1 and the radius R3 of the first spherical concave surface portion 21 and / or at least one of the center O2 and the radius R4 of the second spherical concave surface portion 23 and / or the axial cylindrical concave surface. By appropriately changing the radius of the part 22 around the rolling center axis v, the volume of the boundary vicinity parts A ′ and B ′ can be changed as appropriate, and the lubricant is retained in the boundary vicinity parts A ′ and B ′. The amount of damper and the damper effect by the retained lubricant can be adjusted.

  1 to 8 can be manufactured from resin by injection molding using a molding die.

It is principal part sectional drawing which cut | disconnected the radial ball bearing retainer by this Embodiment in the direction similar to the XI-XI line direction of FIG. It is principal part sectional drawing which cut | disconnected the radial ball bearing retainer of FIG. 1 in the II-II line direction. It is principal part sectional drawing similar to FIG. 2 for demonstrating the modification of the radial ball bearing retainer of FIG. FIG. 10 is a cross-sectional view of the main part similar to FIG. 2 for describing another modification of the radial ball bearing retainer of FIG. 2. FIG. 9 is a cross-sectional view of the main part similar to FIG. 2 for explaining still another modified example of the radial ball bearing retainer of FIG. 2. FIG. 9 is a cross-sectional view of the main part similar to FIG. 2 for explaining still another modified example of the radial ball bearing retainer of FIG. 2. FIG. 9 is a cross-sectional view of the main part similar to FIG. 2 for explaining still another modified example of the radial ball bearing retainer of FIG. 2. It is principal part sectional drawing similar to FIG. 1 for demonstrating the modification of the concave surface part of the pocket of the radial ball bearing retainer of FIG. 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 to the radial ball bearing of FIG. It is principal part sectional drawing cut | disconnected in the XI-XI line direction of the holder | retainer 6 of FIG. It is the principal part top view which looked at the holder | retainer of FIG. 10 from the upper direction of the opening part. 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 60 Radial ball bearing 61 Outer ring raceway surface 62 Inner ring raceway surface 16a, 16b Elastic piece (claw-shaped part)
18 Pocket 20 Radial Ball Bearing Cage, Cage 21 First Spherical Concave Part 22 Axial Cylindrical Concave Part 23 Second Spherical Concave Part 24 Lubricant Reservoir 25, 26 Ball Holding Part 25a, 26a Ball Holding Part 27 Outer Diameter Surface 28 Inner surface 29 Concave surface 31, 32 Lubricant reservoir 33 Ball holder 41, 42 Lubricant reservoir 43 Ball holder 51 Lubricant reservoir 52, 53 Ball holder A, B Near boundary A ′, B 'Near boundary O Center of ball T Opening v Rolling center axis x Direction of rotation D Diameter of ball 5 r62 Groove radius of inner ring raceway surface r61 Groove radius of outer ring raceway surface 61

Claims (10)

In order to hold a plurality of balls arranged between raceway surfaces of a radial ball bearing in a freely rolling manner, the whole is formed in an annular shape and provided with pockets in a plurality of circumferential directions, and the balls are pushed into each pocket. A radial ball bearing retainer having an opening and a concave surface where the ball is located,
The concave surface portion includes a first spherical concave surface portion that is spherically formed on the bottom surface facing the opening, a second spherical concave surface portion that is spherically formed on the opening side, and the first spherical concave surface portion. An axial cylindrical concave surface portion formed in a cylindrical shape around the rolling center axis of the ball between the second spherical concave surface portion,
The concave surface portion further includes a lubricant reservoir provided in at least a part of the circumferential direction for holding the lubricant, and a ball holder for holding the ball in the vicinity of the lubricant reservoir. A retainer for a radial ball bearing, comprising:   The radial ball bearing retainer according to claim 1, wherein a plurality of the lubricant reservoir portions are provided in a groove shape so as to be shifted in the width direction of the pocket.   3. The radial ball bearing retainer according to claim 1, wherein the lubricant reservoir is configured in a groove shape at a substantially center in the width direction of the pocket.   The radial ball according to claim 1, wherein the lubricant reservoir portion is provided on each of an outer diameter surface side and an inner diameter surface side of the cage, and the ball holding portion is provided at a substantially center in the width direction of the pocket. Bearing cage.   The radial ball bearing retainer according to claim 1 or 2, wherein the ball holding portion is provided at substantially the center in the width direction of the pocket.   The radial ball bearing retainer according to any one of claims 1 to 5, wherein the ball retaining portion is provided in the vicinity of each of an outer diameter surface and an inner diameter surface of the retainer.   The radial ball bearing retainer according to claim 6, wherein at least one of the outer diameter surface side and the inner diameter surface side of each ball holding portion provided near each of the outer diameter surface and the inner diameter surface is formed in a curved shape. .   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 7 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 8, 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 8 or 9, wherein the grease has a degree of adjustment in a range of 200 to 280.

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