JP2005180666A - Ball bearing cage and its ball bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ball bearing cage and its ball bearing capable of minimizing the stirring of lubricant by the cage, to prevent the temperature rise and bubbling caused by the stirring. <P>SOLUTION: This ball bearing cage 5 has a plurality of pockets 8 arranged in the circumferential direction and opened to the axial direction to rotatably and undroppably hold balls 4, on one axial face of a circular body 11. These pockets are constituted of recessed parts 10 formed on the circular body 11. In this cage 5, a part 15 between the adjacent pockets 8 has a contour free from the recessed part. A deformation promoting means 14 for promoting the elastic deformation is mounted between adjacent faces of the pockets. Various constitutions can be applied as the deformation promoting means 14, for example, that where the pocket 8 is formed of the recessed part 10 of the annular body and a pair of claw pieces 9, 9, and a space 11 between the claw pieces 9, 9 faced back to back of the adjacent pockets 8, 8 is filled with a space filling member 1. The space filling member 12 is, for example, independently mounted in the space 11 between the claw pieces 9, 9, and made out of an easy-deformable material such as rubber. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a deep groove ball bearing and other ball bearing cages used under oil bath lubrication and the like and the ball bearing thereof.

Deep groove ball bearing cages are broadly divided into metal and resin, and when the lubrication conditions are severe, such as when the viscosity of the lubricating oil is low, resin cages with excellent self-lubricating properties are often used.
As shown in a development view in FIG. 8, in the case of the resin retainer 55, claw pieces 59 are formed on both sides of each pocket 58 to hold the ball 54, and the pocket constituted by the tips of the claw pieces 59. The entrance width diameter d1 is smaller than the diameter d of the ball 52 to be used. When assembling the retainer 55, it is performed by a method of spreading the tip of the claw piece 59 with the ball 54. A so-called snap-on method is taken (for example, Patent Document 1).
JP 2000-266062 A

As described above, the claw piece 59 needs to be freely deformed to some extent in order to assemble the ball 54 to the retainer 55, and the rigidity of the claw piece 54 needs to be suppressed. For this reason, a space 61 exists between the claw pieces 59 between the adjacent balls 54.
However, since this space 61 exists, when the deep groove ball bearing in which the cage 55 is assembled rotates in lubricating oil such as oil bath lubrication, the difference in cross-sectional shape or cross-sectional area in the rotational direction of the cage 55 Becomes larger. As a result, the lubricating oil is agitated unnecessarily, inducing a temperature rise and generation of bubbles in the oil. An increase in temperature is undesirable from the standpoint of shaft support accuracy and the like, and generation of bubbles in the oil is not preferred from a lubrication surface.

  The object of the present invention is to suppress the stirring of the lubricating oil by the cage as much as possible, to prevent the temperature rise and the generation of bubbles due to the stirring, and to incorporate the ball while keeping the ball in a non-detachable manner. The object is to provide a ball bearing cage and a ball bearing thereof.

  The ball bearing retainer according to the present invention has a plurality of pockets arranged in the circumferential direction on one surface of the annular body in the axial direction so as to open in the axial direction and hold the ball in a rollable and non-detachable manner. In the ball bearing retainer made of resin, in which these pockets are formed by recesses formed in the annular body, the portion between the adjacent pockets has a contour without a recess, and the portion between the adjacent pockets Further, a deformation facilitating means for facilitating elastic deformation between adjacent surfaces of these pockets is provided. The deformation facilitating means is a means for facilitating elastic deformation while substantially maintaining a contour having no recess in a portion between adjacent pockets.

  According to the cage of this configuration, since the portion between adjacent pockets has a contour without a recess, when the ball bearing assembled with this cage rotates, the cross-sectional shape and cross-sectional area in the rotation direction of the cage The difference is small. As a result, the stirring of the lubricating oil is suppressed as much as possible, and the temperature rise and the generation of bubbles due to the stirring are prevented. Further, since the deformation facilitating means is provided in the portion between the adjacent pockets, the ball can be incorporated into the pocket by elastic deformation of the portion between the adjacent pockets while being in a pocket shape that keeps the ball from dropping off. it can.

In this invention, the deformation facilitating means may be a slit provided between adjacent pockets. The slit may have a shape without a gap, that is, a shape in which opposing surfaces serving as slit forming surfaces are in contact with each other.
If a slit is provided, the part between adjacent pockets is divided and the wall thickness is reduced, which facilitates elastic deformation and allows the ball to be incorporated even if it has a pocket shape that prevents the ball from falling off. become. Moreover, if it is a slit, the shape which made the part between adjacent pockets the outline which does not have a recessed part does not need to be damaged so much, and stirring of the lubricating oil at the time of rotation can be suppressed.

In this invention, a portion between adjacent pockets is a flat wall portion that is continuous in the circumferential direction between the pockets and has substantially no change in cross-sectional shape. It is good also as a material which elastically deforms so that a ball | bowl can enter into a pocket by pressing to a pocket side. In this case, a slit may be provided between adjacent pockets as described above.
In this way, by making the material of the cage itself easily deformable, the ball can be incorporated while the portion between the adjacent pockets is a flat wall portion continuous in the circumferential direction. be able to. By making the part between adjacent pockets into a continuous flat wall, the change in the cross-sectional area in the rotation direction of the cage is suppressed to a small level, and the stirring of the lubricating oil by the cage is suppressed.

  In order to make the cage of a material that elastically deforms so that the ball can enter the pocket while providing the flat wall portion between the pockets of the cage, the material of the entire cage is easily elastically deformed. In addition, the material of the cage may be partially changed. For example, the wall between the pockets may be made of a material that is easily elastically deformed, and the annular body may be made of a material that is easily elastically deformed at the pocket bottom or the like. When the wall portion between the pockets is made of a material that is easily elastically deformed, the material between the surface portions may be made of a material that is easily elastically deformed as compared with the material of the surface portion serving as the inner surface of the pocket.

In the present invention, the pocket is formed by a recess formed in the annular body and a pair of claw pieces positioned on both sides of the annular body in the circumferential direction of the annular body, and each of the pockets facing each other facing the back. The space between the nail pieces may be filled with a space filling member. In this case, a configuration in which these claw pieces are provided to provide a space filling member space is the deformation facilitating means.
In the case of the cage of this configuration, since the space between the claw pieces facing each other is filled with the space filling member, the complicated shape of the cage is corrected, and when the ball bearing assembled with this cage rotates, The difference in cross-sectional shape and cross-sectional area in the rotation direction of the cage is reduced. As a result, the stirring of the lubricating oil is suppressed as much as possible, and the temperature rise and the generation of bubbles due to the stirring are prevented. Since this cage has claw pieces on both sides of the pocket, the ball can be incorporated into the pocket by elastic deformation of the claw pieces as in the conventional cage. The space filling member may be attached to the cage before the ball is incorporated into the pocket, or may be attached to the cage after the ball is incorporated. In the case where it is attached to the cage before the ball is assembled, it is necessary that the space filling member does not hinder the elastic deformation of the claw piece when the ball is pushed in as much as possible.

For example, the space filling member is provided individually in the space between the claw pieces, and is made of a material that is easier to deform than the material constituting the claw pieces. As such a material, rubber may be used, or a resin material softer than the nail piece may be used.
In this configuration, since the space filling member is easily deformed, even if the space filling member is attached to the cage before the ball is assembled, the claw pieces can be elastically deformed when the ball is assembled, and the ball can be incorporated. .

The space filling member may be an integrated product instead of the individual product as described above. For example, the space filling member is an integral part having an individual space filling portion that fits in a space between the claw pieces and a connecting portion that connects the plurality of individual space filling portions, and the space filling member is The ball may be fitted into the space between the claws after the ball is incorporated in the pocket.
In the case where the space filling member is an integral product, a space in which the connecting portion is disposed is required in the bearing, but the assembly to the cage after the ball is assembled is good. Moreover, since it is not necessary to consider the deformation | transformation of a nail | claw piece if a space filling member is what is built into a holder after ball | bowl incorporation, the material of a space filling member may be a hard thing.

  The ball bearing cage of the present invention can be applied to ball bearings in general. However, in the case of a cage for deep groove ball bearings, it is more effective to provide a space filling member. In a deep groove ball bearing, when a resin cage is used, the cage shape is often provided with a pair of claw pieces as described above on both sides of a pocket. Therefore, the above-described action of suppressing the stirring of the lubricating oil by providing the space filling member is effectively exhibited.

The ball bearing of the present invention includes a resin cage in which a plurality of balls are interposed between the raceways of the inner ring and the outer ring, and holds the plurality of balls. A plurality of pockets that are open in the axial direction and that hold the ball in a rollable and non-droppable manner are arranged in a circumferential direction, and these pockets are formed by recesses formed in the annular body. In the formed ball bearing, the portion between the adjacent pockets of the cage has a contour without a recess, and the portion between the adjacent pockets is easily deformable to facilitate elastic deformation between the adjacent surfaces of the pockets. The present invention is characterized in that an adjusting means is provided.
According to the ball bearing of this structure, since the part between the adjacent pockets of the cage has an outline without a recess, stirring of the lubricating oil can be suppressed, and heat generation of the ball bearing is reduced. That is, effects such as temperature rise suppression can be obtained as a whole bearing. In addition, since the deformation facilitating means is provided, the ball can be incorporated into the pocket while having a pocket shape that keeps the ball from dropping off.

  In the ball bearing cage of the present invention, the portion between adjacent pockets has a contour without a recess, so that stirring of the lubricating oil by the cage can be suppressed as much as possible, and temperature rise and bubble generation due to stirring can be prevented. Further, since the means for facilitating the deformation is provided in the portion between the adjacent pockets, the ball can be incorporated even though the pocket shape holds the ball so that it cannot fall off.

  A first embodiment of the present invention will be described with reference to FIGS. This embodiment is an example applied to a deep groove ball bearing and is an example used in oil lubrication. The ball bearing 1 includes a plurality of balls 4 interposed between raceway surfaces 2 a and 3 a of an inner ring 2 and an outer ring 3, and a cage 5 that holds these balls 4. The outer ring 3 is provided with a pair of seals 6 and 6 for sealing both ends of the bearing space between the inner and outer rings 2 and 3. The seal 6 is a non-contact seal made of a metal shield plate in the illustrated example, but may be a contact seal.

  The cage 5 is made of resin and is a so-called crown type. As shown in FIG. 2, the cage body 5 </ b> A of the cage 5 opens on one axial surface of the annular body 7 in the axial direction to hold the ball 4 so that it can roll and cannot fall off. A plurality of pockets 8 are arranged in the circumferential direction. The pockets 8 are equally spaced. These pockets 8 are formed by a recess 10 formed in the annular body 7 and a pair of claw pieces 9, 9 positioned on both sides of each recess 10 of the annular body 7 in the circumferential direction of the annular body. The inner surface of the pocket 8 has a spherical shape across the recess 10 and the claw piece 9. The inner surface of the pocket 8 only needs to have a shape that can hold the ball 4 in a rollable and non-detachable manner, and may be a combined shape of a plurality of curved surfaces. As shown in FIG. 1B, the claw pieces 9 on both sides of the pocket 8 are shaped so that the tips approach each other, and the entrance diameter d1 between the claw pieces 9 and 9 is smaller than the ball diameter d.

As shown in FIG. 1 (B), in this embodiment, a space filling member 12 is formed between the claw pieces 9 and 9 facing the backs of the adjacent pockets 8 with respect to the cage body 5A of the cage 5. Filled with. Thus, by filling with the space filling member 12, the part 15 between the adjacent pockets 8 is made into the outline without a recessed part. As shown in FIG. 3, the space filling member 12 is individually provided in the space 11 between the claw pieces 9, and is made of a material that is easier to deform than the material constituting the cage body 5 </ b> A. For example, the space filling member 12 is an elastic body such as rubber or a synthetic resin having a lower elastic coefficient than the material of the cage 5. The shape of each space filling member 12 is a shape that fits into the space 11 between the claw pieces 9 facing each other with almost no gap, and the cage body is bonded by an adhesive, or by press-fitting or injection molding. Fixed to 5A or injection molded. The space filling member 12 is attached to the cage main body 5 </ b> A before the ball 4 is incorporated into the cage 5.
The deformation facilitating means 14 is constituted by the components in which the claw pieces 9 are provided and the space 11 is filled with the space filling member 12.

  According to this configuration, since the space 11 between each pair of claw pieces 9 facing each other is filled with the space filling member 12, the complicated shape due to the protrusion of the claw piece 9 of the cage 5 is corrected, and the cage 5 is assembled. When the ball bearing 1 is rotated, the difference in cross-sectional shape and cross-sectional area in the rotation direction of the cage 5 is reduced. As a result, the stirring of the lubricating oil is suppressed as much as possible, and the temperature rise and the generation of bubbles due to the stirring are prevented. Since the cage 6 has claw pieces 9 on both sides of the pocket 8, the ball 4 can be incorporated into the pocket by elastic deformation of the claw pieces 9 as in the conventional cage. At this time, since the space filling member 12 is made of an elastic body, the elastic deformation of the claw piece 9 is not hindered so much and the deterioration of the assemblability of the ball 4 is avoided.

  4 and 5 show a modification of the cage 5. The cage body 5A is the same as that of the first embodiment described above with reference to FIGS. In this example, the space filling member 22 is fitted in the space 11 between the claw pieces 9 facing each other, and a plurality of individual space filling portions 22a, and a ring-shaped connection portion connecting the plurality of individual space filling portions 22a. It is an integral part having 22b. The connecting portion 22b is provided to face the annular body 7 of the cage main body 5A in the axial direction via the pocket 8. The space filling member 22 can be fitted into the space 11 between the claw pieces 9 after the ball 4 is assembled in the pocket 8. The space filling member 22 is fixed to the cage body 5A by bonding with an adhesive, or the individual space filling portion 22a is press-fitted into the space between the claw pieces 9 to be fixed to the cage body 5A. . The material of the individual space filling portion 22a is not particularly limited, and for example, the same material as that of the cage body 5A may be used. Further, a rubber material may be used for easy press-fitting.

  Even when the space filling member 22 is integrated as described above, the complicated shape due to the protrusion of the claw piece 9 of the cage 5 is corrected, and the difference in the cross-sectional area of the cage 5 in the circumferential direction is reduced. As a result, the stirring of the lubricating oil is suppressed as much as possible, and the temperature rise and the generation of bubbles due to the stirring are prevented. Since the space filling member 22 is attached to the cage 5 after the ball 4 is assembled into the cage 5, the assembling workability of the ball 4 is not deteriorated. The mounting operation of the space filling member 22 to the cage main body 5A can be easily performed because the space filling member 22 is an integrated product.

  6 and 7 show a ball bearing retainer 5 according to still another embodiment of the present invention. This cage 5 has a plurality of pockets 6 arranged in the circumferential direction on one surface of the annular body 11 in the axial direction so as to open in the axial direction and hold the ball so that it can roll and cannot fall off. In the ball bearing cage made of resin, a portion between adjacent pockets 8 is a flat wall portion 13 that is continuous in the circumferential direction between the pockets 8 and has a substantially unchanged cross-sectional shape. The inner surface shape of the pocket 8 is a spherical shape or a combination shape of a plurality of types of curved surfaces. The cage 5 is made of a material that is elastically deformed so that the ball 4 can enter the pocket 8 by pressing the ball 4 toward the pocket 8. The ball 4 is pressed against the pocket 8 side, for example, in the axial direction.

  In order to make the cage 5 elastically deformable so that the ball 3 can enter the pocket 8 while providing the flat wall portion 13 between the pockets 8 of the cage 5, the entire cage 5 is used as a means for facilitating deformation. The material of the cage 5 may be partially changed, in addition to the material that is easily elastically deformed. For example, the wall 13 may be made of a material that is easily elastically deformed, and the annular body 11 may be made of a material that is easily elastically deformed at the bottom of the pocket 8 or the like. When the wall portion 13 is made of a material that is easily elastically deformed, the internal material may be made of a material that is easily elastically deformed as compared with the material of the surface portion serving as the inner surface of the pocket 8. The inner surface of the pocket 8 is preferably made of a resin excellent in lubricity and wear resistance, but the inner material does not affect the wear and lubrication, so that the inner surface of the pocket 8 is easily deformed when the ball 4 is pushed in. It is preferable.

  In the cage 5 having this configuration, since the portion between the adjacent pockets 8 is a flat wall portion 13 continuous in the circumferential direction, the change in the cross-sectional area in the rotation direction of the cage 5 is small as in the above embodiments. And the stirring of the lubricating oil by the cage 5 is suppressed.

FIG. 8 shows still another embodiment of the present invention. In this embodiment, in the embodiment shown in FIGS. 6 and 7, a slit 16 is provided between adjacent pockets 8 as a deformation facilitating means instead of using a material that can be easily elastically deformed as a material of the cage 5. It is. Other configurations are the same as those of the embodiment shown in FIGS.
When the slit 16 is provided, the portion 15 between the adjacent pockets 8 is divided and the wall thickness is reduced, so that elastic deformation is facilitated. Therefore, even if it is a pocket shape that holds the ball 4 so as not to drop off, the ball 4 can be incorporated. Moreover, if it is the slit 16, it is not necessary to lose much the shape which made the part 15 between the adjacent pockets 8 the outline without a recessed part, and stirring of the lubricating oil at the time of rotation is suppressed.

(A) is a fragmentary sectional view of the cage for ball bearings concerning a 1st embodiment of this invention, and (B) is a fragmentary sectional view of the deployment state of the cage. It is a perspective view of the holding main body of the holder. It is explanatory drawing which shows the assembly process of the space filling member of the holder. It is a partial top view of the expansion | deployment state of the holder | retainer concerning other embodiment of this invention. It is explanatory drawing of the attachment process of the space filling member of the holder | retainer. It is a perspective view of the holder | retainer concerning further another embodiment of this invention. It is a fragmentary sectional view of the unfolded state of the cage. It is a fragmentary sectional view of the unfolded state of the cage concerning other embodiments of this invention. It is a fragmentary sectional view of the expansion state of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Ball bearing 2 ... Inner ring 3 ... Outer ring 4 ... Ball 5 ... Cage 5A ... Cage body 7 ... Ring body 8 ... Pocket 9 ... Claw piece 10 ... Recess 11 ... Space 12 ... Space filling member 13 ... Wall part 14 ... Deformation facilitating means 15 ... portion 16 between pockets ... slit 22 ... space filling member 22a ... individual space filling portion 22b ... connecting portion

Claims (8)

A plurality of pockets are formed on one surface in the axial direction of the annular body so as to open in the axial direction and hold the ball in a rollable and non-detachable manner along the circumferential direction. In the ball bearing cage made of resin formed by the recess formed in
A ball characterized in that a portion between adjacent pockets has a contour without a recess, and a deformation facilitating means for facilitating elastic deformation between adjacent surfaces of the pockets is provided in a portion between the adjacent pockets. Bearing cage.   The ball bearing retainer according to claim 1, wherein the deformation facilitating means is a slit provided between adjacent pockets.   3. The part between adjacent pockets according to claim 1 or 2, wherein the portion between adjacent pockets is a flat wall portion that is continuous in the circumferential direction between the pockets and has substantially no change in cross-sectional shape. The ball bearing retainer is a material that is elastically deformed so that the ball can enter the pocket by pressing the ball toward the pocket.   2. The pocket according to claim 1, wherein the pocket is formed by a recess formed in the annular body and a pair of claw pieces located on both sides of the annular body in the circumferential direction of each annular body, and faces the backs of adjacent pockets. A ball bearing retainer in which a space between each claw piece is filled with a space filling member, and the deformation facilitating means is provided with a space filling member space by providing these claw pieces.   The ball bearing retainer according to claim 4, wherein the space filling member is individually provided in a space between the claw pieces, and is made of a material that is easier to deform than a material constituting the claw pieces. .   5. The space filling member according to claim 4, wherein the space filling member is an integral part having an individual space filling portion that fits into a space between the claw pieces and a connecting portion that connects the plurality of individual space filling portions. The embedding member is a ball bearing retainer that can be fitted into a space between the claws after the ball is assembled in a pocket.   7. The ball bearing cage according to claim 1, wherein the ball bearing cage is a cage for a deep groove ball bearing. A plurality of balls are interposed between the raceways of the inner ring and the outer ring, and a resin cage is provided to hold the plurality of balls, and the cage is axially provided on one axial surface of the annular body. A plurality of pockets arranged in the circumferential direction so as to open and face the ball so that it can roll and cannot be dropped off, and these pockets are formed in the recesses of the annular body, and the recesses of the annular body In a ball bearing formed by a pair of claw pieces located on both sides of the annular body circumferential direction of
A ball characterized in that a portion between adjacent pockets has a contour without a recess, and a deformation facilitating means for facilitating elastic deformation between adjacent surfaces of the pockets is provided in a portion between the adjacent pockets. bearing.

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