JP2011033063A - Rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing hardly deformed by centrifugal force and having a retainer preventing seizure caused by oil film shortage. <P>SOLUTION: The retainer 10 of the rolling bearing is a waveform retainer in which two annular plates 12, having recessed parts 14 recessed in the axial direction and disposed at equal intervals, are axially matched in a direction so that the recessed parts 14 are on the inside and the circumferential positions of the recessed parts 14 correspond to form a pocket for holding a rolling element 40. Holes 20 are provided at two locations in each of the recessed parts 14 of the annular plates 12 opened on a pocket inner face. A resin member 30 is embedded in each hole 20. An inner projection part 32 configured capable of abutting on the rolling element 40 by projecting to the inside of the pocket is formed on the resin member 30. The resin member 30 is arranged to hold the rolling element 40 and suppress contact of the rolling element 40 with the pocket. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rolling bearing. More specifically, two annular plates in which concave portions recessed in the axial direction are arranged at intervals in the circumferential direction hold the rolling elements in such a direction that the concave portions are inward and corresponding to the circumferential positions of the concave portions. The present invention relates to a rolling bearing provided with a corrugated cage that forms a pocket to be aligned in the axial direction.

In recent years, high-speed rotation of bearings used in transmissions is progressing due to hybridization for automobiles and multi-stage automatic transmissions (AT). Therefore, due to the high speed rotation of the bearing, deformation of the bearing due to centrifugal force and oil film breakage become problems.
Specifically, in the case of a conventional resin crown-shaped cage, the cage is deformed by a centrifugal force, and the rolling element and the cage are abnormally contacted to cause wear of the cage. Further, in the case of a conventional iron corrugated cage, there is no deformation due to centrifugal force, but there is a problem that bearing seizure occurs due to oil film breakage due to sliding contact between the rolling element and the cage.

FIG. 4A shows a cross-sectional view of a rolling bearing 100 provided with an iron corrugated cage according to the prior art. The rolling bearing 100 includes an outer ring 110, an inner ring 120, a ball 130, and a retainer 140 that holds the ball 130. The ball 130 and the retainer 140 are not in direct contact with an oil film of lubricating oil. However, when the cage 140 is moved radially outward of the bearing by centrifugal force due to high-speed rotation, the balls 130 and the cage 140 may come into direct contact by sliding contact, the oil film may be cut, and seizure may occur.
FIG. 4B is a perspective view of the annular plate 142 constituting the cage 140 of the rolling bearing 100 in which seizure has occurred. As shown in FIG. 4B, the seizure may cause scratches 146 in the lower portion of the concave portion 144 of the annular plate 142 constituting the pocket, which may affect the performance of the rolling bearing 100.

  As a prior art, Japanese Patent Application Laid-Open No. 2006-342901 (Patent Document 1) provides a recess in a pocket of an iron corrugated cage to improve the fluidity of the lubricating oil and increase the surface area of the cage. A technique for suppressing temperature rise and friction inside the bearing is described.

JP 2006-342901 A

  However, with the technique described in Patent Document 1, even if the fluidity of the lubricating oil is improved, direct contact between the rolling elements and the corrugated cage is inevitable. For this reason, it is considered that the seizure of the bearing due to the oil film breakage may occur.

  Therefore, the problem to be solved by the present invention is to provide a rolling bearing provided with a cage that is hardly deformed by centrifugal force and can prevent seizure due to oil film breakage.

In order to solve the above problems, the rolling bearing according to the present invention takes the following means.
First, the first invention of the present invention includes an inner ring having an inner ring raceway surface, an outer ring having an outer ring raceway surface, and a plurality of rolls disposed between the inner ring raceway surface and the outer ring raceway surface so as to be capable of rolling. A rolling bearing comprising a rolling element and a metal cage formed with a plurality of pockets for holding the plurality of rolling elements at intervals in the circumferential direction,
The cage includes two annular plates in which concave portions that are recessed in the axial direction are arranged at intervals in the circumferential direction, with the concave portions inward and corresponding to the circumferential positions of the concave portions. A corrugated cage that forms a pocket to hold rolling elements and is aligned with the axial direction.
The rolling element is configured to face the inner surface of the pocket with a gap.
Each of the concave portions of the annular plate is provided with holes that open to the pocket inner surface at one or more locations,
Each hole is embedded with a resin member, and the resin member is formed with an inward protruding portion configured to protrude into the pocket and be brought into contact with the rolling element,
The resin member is configured to hold the rolling elements and to prevent the rolling elements from contacting the pockets.

  According to the first aspect of the present invention, the cage is made of metal, and even when used at high speed rotation, there is almost no deformation due to centrifugal force. In addition, the rolling element is configured to be able to contact an inward protruding portion that protrudes into the pocket of the resin member embedded in the pocket of the cage, and the resin member holds the rolling element and is placed in the pocket of the rolling element. The arrangement configuration can prevent contact. Therefore, there is no direct contact between the rolling element and the pocket due to sliding contact, and seizure due to the oil film breakage can be prevented. And since there exists a clearance gap between a rolling element and a pocket, it is easy to hold | maintain lubricating oil in a pocket.

Next, 2nd invention of this invention is a rolling bearing which concerns on the said 1st invention, Comprising: The said rolling element is a ball | bowl, In the site | part which contacts the said ball | bowl of the inward protrusion part of the said resin member, A contact surface is formed, and the shape of the contact surface is either a planar shape or a concave spherical shape having a curvature radius equal to or larger than the curvature radius of the ball.
According to the second aspect of the present invention, the contact surface of the inwardly projecting portion of the resin member that contacts the ball is a flat surface or a concave spherical surface having a radius of curvature equal to or greater than the radius of curvature of the ball. Contacts the ball at a shallow angle at the center of the contact surface. Therefore, the loss due to slip resistance can be suppressed to the same level as the resin cage.

Next, a third invention of the present invention is the rolling bearing according to the first invention or the second invention, wherein the hole is a through-hole penetrating the cage, and the resin member is An outward projecting portion projecting from the opening on the opposite side of the pocket is provided, and the inward projecting portion and the outward projecting portion are configured to project around the through hole.
According to the third aspect of the invention, since the resin member protrudes around the through hole on both sides of the through hole provided in the cage, the resin member does not fall off from the cage. Therefore, it is not necessary to consider that the resin member is embedded in the cage when the cage is transported or assembled to the rolling bearing, and the cage is easy to handle.

According to each invention of the present invention described above, the following effects can be obtained.
First, according to the first invention described above, it is possible to provide a rolling bearing provided with a cage that is hardly deformed by centrifugal force and that can prevent seizure due to oil film breakage. And it is easy to hold | maintain lubricating oil in a pocket.
Next, according to the second invention described above, loss due to slip resistance can be suppressed to the same level as that of the resin cage.
Next, according to the above-described third invention, since the resin member does not fall off from the cage, the resin member is embedded in the cage when the cage is transported or assembled to the rolling bearing. There is no need to consider it, and the cage is easy to handle.

It is a figure which shows the structure of the cyclic | annular board which comprises a holder | retainer in Example 1. FIG. It is an external appearance perspective view of the holder | retainer in Example 1. FIG. It is a figure which shows the cross section of the holder | retainer in Example 1. FIG. It is a figure which shows the holder | retainer by a prior art.

  Hereinafter, modes for carrying out the present invention will be described according to examples.

[Configuration of Example 1]
The rolling bearing according to the first embodiment of the present invention is a rolling bearing that is used for automobile transmissions and the like and that supports high-speed rotation. And, an inner ring having an inner ring raceway surface, an outer ring having an outer ring raceway surface, a plurality of rolling elements arranged to roll freely between the inner ring raceway surface and the outer ring raceway surface, and a plurality of rolling elements in the circumferential direction And an iron cage formed with a plurality of pockets that are held at intervals. In Example 1, the shape of the rolling element is a ball.
FIG. 1 shows an iron annular plate 12 that constitutes a rolling bearing cage 10 (see FIG. 2) of the first embodiment. The cage 10 has two annular plates 12 in which concave portions 14 that are recessed in the axial direction are arranged at equal intervals in the circumferential direction, with the concave portions 14 facing inward, and corresponding circumferential positions of the concave portions 14. It is a waveform holder that forms a pocket for holding a rolling element and is aligned in the axial direction. FIG. 1A shows a radial cross section of the annular plate 12 constituting the cage 10, and FIG. 1B shows a view of the annular plate 12 seen from the outside in the radial direction. FIG. 1C shows a side view of the annular plate 12.

A flat portion 16 is formed between the concave portion 14 and the concave portion 14 of the annular plate 12, and in a state where the two annular plates 12 are aligned in the axial direction, as shown in FIGS. 1 (a) and 1 (b), the flat portion 16 are in contact with each other. The flat portion 16 is formed with a fastening hole 18 for fastening the annular plate 12 with rivets.
1 (a) to 1 (c), the concave portion 14 of the annular plate 12 is close to both ends from the center in the circumferential direction of the concave portion 14 at the central portion of the annular plate 12 in the radial direction. In two places, holes 20 and 20 are formed which penetrate the annular plate 12 and open on the inner surface of the pocket and on the opposite side of the pocket.

The cage 10 is assembled according to the following procedure. First, the resin member 30 is embedded in each hole 20 of the recess 14 of the annular plate 12. In addition, it is preferable to use an oil-containing resin for the resin member 30. Then, the two annular plates 12 are formed so that the recesses 14 face inward and the circumferential positions of the recesses 14 are aligned to form a pocket, and the rolling elements 40 (see FIG. 3) are encased in the pocket, The annular plate 12 is aligned in the axial direction. And the cage 10 of the state which included the rolling element 40 is formed by driving a rivet into the fastening hole 18 of the flat part 16 of the annular plate 12, and fastening the two annular plates 12. As shown in FIG.
FIG. 2 shows an external perspective view of the cage 10. In FIG. 2, the rivet and the rolling element 40 are not shown. In addition, since the recessed part 14 of the annular plate 12 is equidistant, the holder | retainer 10 can be assembled with arbitrary two annular plates 12, and the alignment of the circumferential direction of the annular plate 12 is easy.

FIG. 3 shows a cross-sectional view of the cage 10 in a state where the rolling elements 40 are encased in the pockets at the central portion in the radial direction. As shown in FIG. 3, at the end of the pocket side of the resin member 30 embedded in each hole 20 of the concave portion 14 of the annular plate 12, an inward protruding portion 32 protruding into the pocket and projecting around the hole 20 is formed. Is formed. And the rolling element 40 is set as the structure which faces a gap with respect to the inner surface of a pocket.
A concave spherical contact surface 34 that can contact the rolling element 40 is formed on a portion of the inward projecting portion 32 of the resin member 30 that faces the rolling element 40. The radius is set larger than the radius of curvature of the rolling element 40. And the rolling element 40 in the same cross section rather than the virtual inscribed circle which arbitrary three contact surfaces form among the four contact surfaces 34 in the cross section perpendicular | vertical to the radial direction (radial direction of the holder | retainer 10) of a rolling bearing. The circle that forms is getting smaller. And the rolling element 40 is hold | maintained by the contact surface 34 of the four resin members 30 which protrudes inside a pocket, and it is set as the structure which the rolling element 40 and the recessed part 14 of the annular plate 12 which forms a pocket do not contact directly. ing. In this way, the rolling element 40 comes into contact with two or less contact surfaces. Since the rolling element 40 contacts the resin member 30 in the revolution direction (vertical direction in FIG. 3), the resin member 30 is spaced apart in the axial direction (left and right direction in FIG. 3) in order to facilitate the holding of the rolling element 40. Is arranged to be slightly narrower than the interval in the circumferential direction (vertical direction in FIG. 3).
An outward projection 36 that protrudes from the annular plate 12 and protrudes around the hole 20 is formed at the end of the resin member 30 opposite to the pocket side.

[Effect of Example 1]
According to the rolling bearing of the first embodiment, the cage 10 is made of iron, and there is almost no deformation due to centrifugal force even if it is rotated at a high speed. Further, the rolling element 40 can be brought into contact with the contact surface 34 of the inward protruding portion 32 protruding into the pocket of the resin member 30 embedded in the recess 14 of the annular plate 12 constituting the pocket of the cage 10. Since the rolling element 40 is held by the resin member 30, direct contact with the recess 14 of the annular plate 12 constituting the pocket of the rolling element 40 is suppressed. Therefore, there is no direct contact between the rolling element and the pocket due to the sliding contact, and seizure due to oil film breakage can be prevented. Moreover, since there is a gap between the rolling element 40 and the pocket, it is easy to hold the lubricating oil in the pocket.
And since the contact surface 34 of the inward protrusion part 32 of the resin member 30 which contacts the rolling element 40 is made into the concave spherical surface whose curvature radius is larger than the curvature radius of the rolling element 40, the contact surface 34 is It contacts the rolling element 40 at a shallow angle at the center. Therefore, the loss due to slip resistance can be suppressed to the same level as the resin cage.
Further, since the resin member 30 protrudes around the hole 20 on both sides of the hole 20 penetrating the annular plate 12 provided in the concave portion 14 of the annular plate 12 constituting the cage 10, the resin member 30 is removed from the cage 10. It will not drop out. Therefore, it is not necessary to consider that the resin member 30 is embedded in the cage 10 when the cage 10 is transported or assembled to the rolling bearing, and the cage 10 is easy to handle.

[Modification]
In the first embodiment, two holes 20 for embedding the resin member 30 are formed in each of the recesses 14. However, the number of the holes 20 can hold the rolling elements 40 by the resin member 30, and the pockets of the rolling elements 40 can be retained. As long as direct contact with the concave portion 14 can be suppressed, the concave portion 14 is not limited to two places. For example, a resin member is provided by providing holes 20 at three convenient locations, one at the concave portion 14 of one annular plate 12 and two at the concave portion 14 of the other annular plate 12 so as to be substantially equidistant in the circumferential direction of the pocket. If 30 is embedded, it is possible to hold the rolling element 40 by the resin member 30 and prevent the rolling element 40 from contacting the pocket. Moreover, it can also be set as the structure which forms the hole 20 which embeds the resin member 30 in the recessed part 14 of both the annular plates 12, respectively.

Moreover, in Example 1, the hole 20 which penetrates the cyclic | annular board 12 is formed in the recessed part 14 of the cyclic | annular board 12, and the resin member 30 is embedded, However, The hole 20 does not need to be a through-hole. As a hole with a bottom that opens the hole 20 on the pocket side, an inward protrusion 32 that protrudes into the pocket is provided at the tip of the resin member 30 embedded in the hole 20, and the rolling element 40 and the recess 14 of the annular plate 12 are provided. It is good also as a structure which suppresses contact of this. And the shape of the front-end | tip of the inward protrusion part 32 should just be the structure which contacts the rolling element 40 at a shallow angle, and is not limited to concave spherical shape with a larger curvature radius than the rolling element 40. FIG.
In addition, the rolling bearing according to the present invention can be implemented in various forms within the scope of the idea of the invention.

DESCRIPTION OF SYMBOLS 10 Cage 12 Annular plate 14 Recess 16 Flat part 18 Fastening hole 20 Hole 30 Resin member 32 Inner protrusion 34 Contact surface 36 Outer protrusion 40 Rolling element

Claims (3)

An inner ring having an inner ring raceway surface, an outer ring having an outer ring raceway surface, a plurality of rolling elements disposed between the inner ring raceway surface and the outer ring raceway surface, and a plurality of rolling elements. A rolling bearing comprising a metal cage formed with a plurality of pockets that are spaced apart in the direction,
The cage includes two annular plates in which concave portions that are recessed in the axial direction are arranged at intervals in the circumferential direction, with the concave portions inward and corresponding to the circumferential positions of the concave portions. A corrugated cage that forms a pocket to hold rolling elements and is aligned with the axial direction.
The rolling element is configured to face the inner surface of the pocket with a gap.
Each of the concave portions of the annular plate is provided with holes that open to the pocket inner surface at one or more locations,
Each hole is embedded with a resin member, and the resin member is formed with an inward protruding portion configured to protrude into the pocket and be brought into contact with the rolling element,
The rolling bearing according to claim 1, wherein the resin member is configured to hold the rolling element and prevent the rolling element from contacting the pocket. The rolling bearing according to claim 1,
The rolling element is a ball,
A contact surface is formed at a portion of the inward protruding portion of the resin member that contacts the ball, and the shape of the contact surface is either a flat surface or a concave spherical surface having a radius of curvature equal to or greater than the radius of curvature of the ball. A rolling bearing characterized by The rolling bearing according to claim 1 or 2,
The hole is a through-hole penetrating the cage;
The resin member includes an outward projecting portion that projects from an opening on the opposite side of the pocket,
The rolling bearing according to claim 1, wherein the inward protruding portion and the outward protruding portion are configured to protrude around the through hole.

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