JP2008164094A - Deep groove ball bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deep groove ball bearing capable of avoiding stress concentration on the bottom faces of pocket parts of a crown type cage even if the crown type cage is axially and radially vibrated by the vibration of a bearing during high speed rotation. <P>SOLUTION: The deep groove ball bearing 10 comprises an inner ring 11 having a raceway groove 11a; an outer ring 12 having a raceway groove 12a; a plurality of balls 13 rollably interposed between the respective raceway grooves 11a, 12a; and the crown-type cage 14 having the pocket parts 15 for holing the plurality of balls at equal spaces in a circumferential direction. The crown type cage 14 is provided with engaging parts 19 axially engaged with the raceway groove 12a, at the outer peripheral parts of pillar sections 18 between the pocket parts 15 adjacent to each other in a circumferential direction and guided by the outer ring 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a deep groove ball bearing provided with a crown type cage, and more particularly to a deep groove ball bearing suitable for high-speed rotation specifications.

  As a conventional deep groove ball bearing, for example, a deep groove ball bearing 100 shown in FIG. 9 is known. In the deep groove ball bearing 100, as shown in FIG. 9, a plurality of balls 3 as rolling elements are disposed between an inner ring 1 and an outer ring 2, and the plurality of balls 3 are held in an annular crown shape. It is hold | maintained so that rolling is possible at equal intervals in the circumferential direction via the container 4. FIG.

  The crown type cage 4 is often used in injection molded products such as polyamide resin materials containing glass fibers in accordance with recent demands for weight reduction, noise reduction, and speedup. For example, FIG. 10 and FIG. 11 is known (see, for example, Patent Document 1).

  The crown type retainer 4 is formed with pocket portions 5 for holding a plurality of balls 3 so as to be able to roll at equal intervals in the circumferential direction, and axially at both circumferential ends of the inner peripheral surface of the pocket portion 5. A pair of claw portions 6 projecting on the surface are provided. Further, an opening 7 is formed between the pair of claws 6, and the ball 3 is pushed into the pocket 5 while expanding the pair of claws 6 from the opening 7. The ball 3 is stored through a minute gap. In a state where the ball 3 is stored in the pocket portion 5, the ball 3 is held in the axial direction by the snapping portions 6 a provided on the inner peripheral surfaces of the pair of claw portions 6 of the pocket portion 5.

JP 2000-170772 A

  However, the conventional deep groove ball bearing 100 is often used in an environment in which vibration is likely to occur due to the recent trend toward high-speed rotation, and the cage in the bearing also vibrates in the axial and radial directions. It's getting bigger.

  Therefore, in the conventional crown type cage 4, since the pocket portion 5 has a concave spherical shape and is a ball (rolling element) guide, when the crown type cage 4 vibrates in the axial direction, it is shown in FIG. 12. As described above, when the snapping portion 6a of the pocket portion 5 collides with the ball 3 (see A portion in FIG. 12), tensile stress is generated on the bottom surface of the pocket portion 5 (see B portion in FIG. 12). When the mold holder 4 vibrates in the radial direction, as shown in FIG. 13, the edge portions on the inner diameter side and the outer diameter side of the pocket portion 5 collide with the balls 3 (see C portion in FIG. 13). Since tensile stress is generated on the bottom surface (especially the edge portion) of the pocket portion 5, stress concentrates on the bottom surface of the pocket portion 5 of the crown type cage 4, leading to a reduction in the life of the crown type cage 4. There was a problem.

  The present invention has been made to eliminate such inconveniences, and the purpose of the present invention is to maintain the crown-shaped holder even if the crown-shaped cage vibrates in the axial direction and the radial direction due to the vibration of the bearing during high-speed rotation. It is an object of the present invention to provide a deep groove ball bearing capable of avoiding stress concentration on the bottom surface of the pocket portion of the vessel.

The above object of the present invention can be achieved by the following constitution.
(1) A pair of raceways each having a raceway groove, a plurality of balls interposed between the raceway grooves of the pair of raceways, and a plurality of balls are held at equal intervals in the circumferential direction. A deep groove ball bearing having a pocket-shaped cage, the crown-shaped cage being guided by one of a pair of races and having a column portion between pocket portions adjacent to each other in the circumferential direction. A deep groove ball bearing characterized in that an engaging portion that engages with the raceway groove in the axial direction is provided on the outer peripheral portion or the inner peripheral portion.
(2) The crown type cage has an opening provided between both ends in the circumferential direction of the inner peripheral surface of the pocket portion, and the opening width of the opening portion is substantially the same as the diameter of the pocket portion. The deep groove ball bearing according to (1).
(3) The deep groove ball bearing according to (1) or (2), wherein the engaging portion is a protrusion.

  According to the deep groove ball bearing of the present invention, the crown type cage is guided by one of the pair of race rings, and the raceway is provided on the outer peripheral portion or the inner peripheral portion of the column portion between the pocket portions adjacent to each other in the circumferential direction. Since the engagement portion that engages with the groove in the axial direction is provided, the crown type cage is positioned in the axial direction and the radial direction, so that it is possible to avoid the collision load of the ball from acting on the bottom surface of the pocket portion. The ball can be prevented from colliding with the inner diameter side and outer diameter side edge portions of the pocket portion. Thus, even if the crown type cage vibrates in the axial direction and the radial direction due to the vibration of the bearing during high-speed rotation, it is possible to avoid the concentration of stress on the bottom surface of the pocket portion of the crown type cage.

  Hereinafter, each embodiment of the deep groove ball bearing according to the present invention will be described in detail with reference to the drawings.

(First embodiment)
First, with reference to FIGS. 1-4, 1st Embodiment of the deep groove ball bearing which concerns on this invention is described.
FIG. 1 is a partially cutaway perspective view for explaining a first embodiment of a deep groove ball bearing according to the present invention, FIG. 2 is a cross-sectional view of an essential part of the deep groove ball bearing shown in FIG. 1, and FIG. 3 is a deep groove shown in FIG. FIG. 4 is a partial development view of the crown type cage shown in FIG. 3, and FIG. 4 is a perspective view for explaining a crown type cage incorporated in the ball bearing.

  As shown in FIGS. 1 and 2, the deep groove ball bearing 10 of the present embodiment includes a plurality of rolling elements between the raceway groove 11 a of the inner ring (track ring) 11 and the raceway groove 12 a of the outer ring (track ring) 12. A plurality of balls 13 are held so as to be capable of rolling at equal intervals in the circumferential direction via a resin crown-shaped cage 14.

  The crown type retainer 14 is an outer ring guide type guided by the inner peripheral surface of the groove shoulder 12b of the outer ring 12, and as shown in FIG. 3, a pocket portion 15 that holds the ball 13 in a rollable manner is provided. A plurality of locations are formed at substantially equal intervals in the circumferential direction. An opening 17 is provided between both ends of the inner peripheral surface of the pocket portion 15 in the circumferential direction, and the opening width of the opening 17 is substantially the same as the diameter of the pocket portion 15. Then, by pushing the ball 13 into the pocket portion 15 from the opening portion 17, the ball 13 is stored in the pocket portion 15 through a minute gap. It should be noted that the crown type cage 14 of the present embodiment is not provided with a pair of claw portions and a snapping portion unlike a conventional crown type cage.

  The resin material of the crown-shaped cage 14 is polyamide resin such as 46 nylon or 66 nylon, polybutylene terephthalate, polyferene sulfide (PPS), polyamideimide (PAI), thermoplastic polyimide, polyether ether ketone (PEEK). And polyether nitrile (PEN). Further, the rigidity and dimensional accuracy of the cage can be improved by appropriately adding 10 to 50% by weight of a fibrous filler (for example, glass fiber or carbon fiber) to the above-described resin.

  Moreover, in this embodiment, as shown in FIG.3 and FIG.4, the crown type holder | retainer 14 is equipped with the pillar part 18 between each pocket part 15 mutually adjacent to the circumferential direction, and the outer periphery of this pillar part 18 is shown. On the surface, a protrusion (engagement portion) 19 that is engaged with the raceway groove 12a of the outer ring 12 in the axial direction is provided. Then, by engaging the protrusion 19 with the raceway groove 12a, the crown type retainer 14 is positioned in the axial direction.

  As described above, according to the deep groove ball bearing 10 of the present embodiment, the crown type cage 14 has the projection 19 provided on the outer peripheral surface of the column portion 18 engaged with the raceway groove 12a of the outer ring 12 and the shaft. Therefore, even if the crown-shaped cage 14 vibrates in the axial direction, the collision load of the balls 13 does not act on the bottom surface of the pocket portion 15, so that tensile stress is generated on the bottom surface of the pocket portion 15. Can be avoided.

  Further, according to the deep groove ball bearing 10 of the present embodiment, the crown type cage 14 is positioned in the radial direction by the groove shoulder 12b of the outer ring 12, so that even if the crown type cage 14 vibrates in the radial direction. Since the balls 13 do not collide with the edge portions on the inner diameter side and the outer diameter side of the pocket portion 15, it is possible to avoid the occurrence of tensile stress on the bottom surface of the pocket portion 15.

  Further, according to the deep groove ball bearing 10 of the present embodiment, the crown type cage 14 is not provided with a pair of claw portions and a pinch portion unlike the conventional crown type cage, so that the axial length of the column portion 18 is increased. Therefore, the inertial force generated at the axial end of the cage 14 on the opening 17 side can be reduced. Thereby, the torsional deformation of the cage 14 due to the elastic or plastic deformation with the axial end on the cage rim side caused by the centrifugal force at the time of high-speed rotation as the torsion axis can be suppressed.

  As a result, even if the crown type cage 14 vibrates in the axial direction and the radial direction due to the vibration of the deep groove ball bearing 10 during high-speed rotation, stress concentration on the bottom surface of the pocket portion 15 of the crown type cage 14 is avoided. Therefore, the durability of the crown type cage 14 and the deep groove ball bearing 10 can be improved.

(Second Embodiment)
Next, with reference to FIG.5 and FIG.6, 2nd Embodiment of the deep groove ball bearing which concerns on this invention is described. Note that portions that are the same as or equivalent to those of the first embodiment are denoted by the same reference numerals in the drawings, and description thereof is omitted or simplified.
FIG. 5 is a sectional view of an essential part for explaining a second embodiment of the deep groove ball bearing according to the present invention, and FIG. 6 is a perspective view for explaining a crown type cage incorporated in the deep groove ball bearing shown in FIG. is there.

  As shown in FIGS. 5 and 6, the deep groove ball bearing 20 of the present embodiment has an outer diameter size on the opening 17 side of the crown type cage 24 smaller than an outer diameter size on the rim side.

As described above, according to the deep groove ball bearing 20 of the present embodiment, in order to make the outer diameter of the opening 17 side of the crown-shaped cage 24 smaller than the outer diameter of the rim side, the crown-shaped cage 24 is The weight can be reduced. Thereby, the torsional deformation of the cage 24 due to the elastic or plastic deformation with the axial end on the cage rim side caused by the centrifugal force during high-speed rotation as the torsion axis can be further suppressed.
About another structure and an effect, it is the same as that of the said 1st Embodiment.

(Third embodiment)
Next, with reference to FIG.7 and FIG.8, 3rd Embodiment of the deep groove ball bearing which concerns on this invention is described. Note that portions that are the same as or equivalent to those of the first embodiment are denoted by the same reference numerals in the drawings, and description thereof is omitted or simplified.
FIG. 7 is a cross-sectional view of an essential part for explaining a third embodiment of the deep groove ball bearing according to the present invention, and FIG. 8 is a perspective view for explaining a crown type cage incorporated in the deep groove ball bearing shown in FIG. is there.

  In the deep groove ball bearing 30 of the present embodiment, as shown in FIGS. 7 and 8, the guide surface of the crown-shaped cage 34 is the outer peripheral surface (inner ring guide system) of the groove shoulder 11b of the inner ring 11, and the pillar A protrusion 19 is provided on the inner peripheral surface of the portion 18 to engage with the raceway groove 11a of the inner ring 11 in the axial direction. Then, the crown-shaped cage 34 is positioned in the axial direction by engaging the projection 19 with the raceway groove 11a.

As described above, according to the deep groove ball bearing 30 of the present embodiment, the crown type cage 34 is guided by the groove shoulder 11b of the inner ring 11, and the raceway groove 11a and the shaft are formed on the inner peripheral surface of the column portion 18. Since the protrusion 19 that engages in the direction is provided, the crown-shaped cage 34 is positioned in the axial direction and the radial direction, so that it is possible to avoid the collision load of the balls 13 from acting on the bottom surface of the pocket portion 15. It is possible to avoid the balls 13 from colliding with the inner diameter side and outer diameter side edge portions of the pocket portion 15. Thus, even if the crown type cage 34 vibrates in the axial direction and the radial direction due to the vibration of the bearing 30 during high-speed rotation, it is possible to avoid stress concentration on the bottom surface of the pocket portion 15 of the crown type cage 34. Can do.
About another structure and an effect, it is the same as that of the said 1st Embodiment.

It is a partially cutaway perspective view for explaining a first embodiment of a deep groove ball bearing according to the present invention. It is principal part sectional drawing of the deep groove ball bearing shown in FIG. It is a perspective view for demonstrating the crown type holder | retainer integrated in the deep groove ball bearing shown in FIG. FIG. 4 is a partial development view of the crown type cage shown in FIG. 3. It is principal part sectional drawing for demonstrating 2nd Embodiment of the deep groove ball bearing which concerns on this invention. It is a perspective view for demonstrating the crown type holder | retainer integrated in the deep groove ball bearing shown in FIG. It is principal part sectional drawing for demonstrating 3rd Embodiment of the deep groove ball bearing which concerns on this invention. It is a perspective view for demonstrating the crown type holder | retainer integrated in the deep groove ball bearing shown in FIG. It is principal part sectional drawing for demonstrating the conventional deep groove ball bearing. FIG. 10 is a partial development view of a crown type cage incorporated in the deep groove ball bearing shown in FIG. 9. FIG. 10 is a perspective view of a crown type cage incorporated in the deep groove ball bearing shown in FIG. 9. It is explanatory drawing for demonstrating the stress concentration which arises by the vibration of the axial direction of the conventional crown type holder | retainer. It is explanatory drawing for demonstrating the stress concentration which arises by the vibration of the radial direction of the conventional crown type holder | retainer.

Explanation of symbols

10, 20, 30 Deep groove ball bearing 11 Inner ring (Raceway ring)
11a Raceway groove 12 Outer ring (Raceway)
12a Track groove 13 Ball 14, 24, 34 Crown type cage 15 Pocket portion 17 Opening portion 18 Pillar portion 19 Projection portion (engaging portion)

Claims (3)

A pair of raceways each having a raceway groove, a plurality of balls interposed between the raceway grooves of the pair of raceways, and a pocket for holding the plurality of balls at equal intervals in the circumferential direction A deep groove ball bearing comprising a crown-shaped cage having a portion,
The crown type cage is guided by one of the pair of race rings and is engaged with the raceway groove in the axial direction on an outer peripheral portion or an inner peripheral portion of the column portion between the pocket portions adjacent to each other in the circumferential direction. A deep groove ball bearing characterized in that an engaging portion is provided. The crown type retainer has an opening provided between both ends in the circumferential direction of the inner peripheral surface of the pocket portion,
The deep groove ball bearing according to claim 1, wherein an opening width of the opening is substantially the same as a diameter of the pocket portion.   The deep groove ball bearing according to claim 1, wherein the engaging portion is a protrusion.

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