JP2009168180A - Roller bearing cage - Google Patents

Abstract

The present invention provides a roller bearing cage capable of preventing oil film breakage due to an outer diameter side claw portion formed on a pillar portion of the cage.
SOLUTION: First and second annular portions 21 and 22, a plurality of column portions 30 that define a plurality of pockets 23 that store rollers 10, and outer diameter side portions of opposing surfaces of these column portions 30 And an outer diameter side claw portion 40 and an inner diameter side claw portion 50 that are in contact with the outer peripheral surface of the roller 10 and prevent the roller 10 from coming off. The first and second annular portions 21 and 22, the plurality of column portions 30, and the inner and outer diameter side claw portions 40 and 50 are integrally formed of a synthetic resin material. The outer diameter side claw portion 40 is arranged so that the tip of the outer diameter side claw portion 40 does not exceed the outer diameter surface 31 of the column portion 30 when displaced outward in the radial direction by the centrifugal force during rotation of the bearing. A predetermined amount h is formed on the inner diameter side of the outer diameter surface 31 of the portion 30.
[Selection] Figure 2

Description

  The present invention relates to a roller bearing retainer.

As a roller bearing retainer, for example, there is a structure disclosed in Patent Document 1.
In this, as shown in FIG. 6, a plurality of pockets 123 and a plurality of column portions 130 are alternately formed on a metal plate (steel plate), and an outer diameter side portion and an inner diameter side of the opposing surfaces of these column portions 130. The outer diameter side claw portion 140 and the inner diameter side claw portion 150 that are in contact with the outer peripheral surface of the roller 110 to prevent the roller 110 from being formed are formed by caulking (pressing) or the like. Thereafter, the metal plate is rounded into a cylindrical shape, and both end butted portions are welded to manufacture (configure) the cage 120.
JP-A-8-31650

By the way, in the steel bearing retainer disclosed in Patent Document 1, the outer diameter side claw portion 140 is obtained by caulking the edges of the outer diameter surfaces of the plurality of column portions 130 by being dented by caulking punches or the like. Is formed. For this reason, caulking recesses 145 are formed at the edges of the outer diameter surfaces of the plurality of pillars 130, and edges 146 are generated around the caulking recesses 145.
For this reason, the roller 110 accommodated in each pocket 123 of the cage 120 is assembled, for example, with the inner hole of the planetary gear of the planetary gear device as the outer diameter side raceway surface and the outer peripheral surface of the gear shaft as the inner diameter side raceway surface. When used, each pillar 130 of the cage 120 is displaced outward in the radial direction by the centrifugal force when the bearing rotates. Then, it is assumed that the edge 146 of the caulking concave portion 145 corresponding to the outer diameter side claw portion 140 comes into contact with the oil film on the inner peripheral surface of the inner hole (outer diameter side raceway surface) of the planetary gear, and there is a concern that the oil film is cut There is.
In view of the above problems, an object of the present invention is to provide a roller bearing cage that can prevent oil film breakage due to an outer diameter side claw portion formed in a column portion of the cage.

In order to solve the above problems, a roller bearing retainer according to a first aspect of the present invention includes first and second annular portions disposed at predetermined intervals in the axial direction, and the first and second annular portions. A plurality of column portions that connect the annular portions and define a plurality of pockets that store the rollers, and are protruded from the outer diameter side portion and the inner diameter side portion of the facing surfaces of the plurality of column portions, respectively. A roller bearing retainer comprising an outer diameter side claw portion and an inner diameter side claw portion having a roller contact surface that comes into contact with the outer peripheral surface of the roller and prevents the roller from coming off,
A cage is formed by integrally molding the first and second annular portions, the plurality of pillar portions, and the claw portions on the inner and outer diameter sides with a synthetic resin material,
The outer diameter side claw portion is arranged so that the tip of the outer diameter side claw portion does not exceed the outer diameter surface of the column portion when the outer diameter side claw portion is displaced radially outward by a centrifugal force during bearing rotation. It is characterized in that it is located on the inner diameter side by a predetermined amount from the outer diameter surface of the portion and is formed to protrude from the side surface of the column portion to the pocket side.

According to the above-described configuration, for example, the roller accommodated in each pocket of the cage is assembled with the inner hole of the planetary gear of the planetary gear device as the outer diameter side raceway surface, and the outer peripheral surface of the gear shaft as the inner diameter side raceway surface, When using, even if the outer diameter side claw part of each column part is displaced radially outward by the centrifugal force during bearing rotation, the tip of the outer diameter side claw part must exceed the outer diameter surface of the column part. There is no.
For this reason, it can prevent well that the front-end | tip of an outer diameter side nail | claw part contacts the oil film of the internal peripheral surface of the inner hole of a planetary gear, and it causes oil film cutting | disconnection.
Further, by making the cage made of a synthetic resin, the effect is great in reducing the weight as compared with a metal one.

A roller bearing retainer according to claim 2 is the roller bearing retainer according to claim 1,
An annular recess is formed in the circumferential direction in the axially central portion of the outer diameter surface of the plurality of column portions,
The outer diameter side claw portion is located on both sides of the portion where the annular recess is formed, and extends in a long shape in the axial direction.
According to the above configuration, even if the axial central portion of the outer diameter surface of each column portion is deformed radially outward by the centrifugal force at the time of bearing rotation, it is formed at the axial central portion of the outer diameter surface of the column portion. Contact with the inner peripheral surface of the inner hole of the planetary gear can be avoided by the annular recess.
Further, the outer diameter side claw portion is positioned on both sides of the portion where the annular concave portion is formed and extends in a long shape in the axial direction, thereby providing a structure having high rigidity and being difficult to deform.
For this reason, the effect is great in preventing oil film breakage on the inner peripheral surface of the inner hole of the planetary gear.

  The best mode for carrying out the present invention will be described in accordance with an embodiment.

[Example 1]
A first embodiment of the present invention will be described with reference to FIGS.
1 is a perspective view showing a roller bearing retainer according to Embodiment 1 of the present invention. FIG. 2 is an enlarged perspective view showing a part of the cage. FIG. 3 is a longitudinal sectional view showing an outer diameter side claw portion and an inner diameter side claw portion formed on the opposing surface of the pillar portion of the cage. 4 is a cross-sectional view based on the line VI-VI in FIG. FIG. 5 is a developed view showing the pocket of the cage from the outer diameter side.

As shown in FIGS. 1 and 2, the cage 20 for roller bearings (including needle roller bearings) includes first and second annular portions 21 and 22, a plurality of column portions 30 and inner and outer diameter sides. The claw portions 40 and 50 are integrally formed of a synthetic resin material having wear resistance and heat resistance.
The first and second annular portions 21 and 22 are arranged at predetermined intervals in the axial direction.
The plurality of column portions 30 connect the first and second annular portions 21 and 22 and define a plurality of pockets 23 for accommodating the rollers 10.

As shown in FIG. 2 to FIG. 5, the outer diameter side claw portion 40 protrudes from the four opposing portions of the opposing surfaces of the plurality of column portions 30 at four locations near the outer diameter side. Each outer diameter side claw portion 40 is formed with an inclined roller contact surface 41 that comes into contact with the outer peripheral surface of the roller 10 accommodated in the pocket 23 and prevents the roller 10 from coming off.
In addition, the outer diameter side claw portion 40 does not have the tip of the outer diameter side claw portion 40 exceeding the outer diameter surface 31 of the column portion 30 when displaced outward in the radial direction by the centrifugal force during rotation of the bearing. Further, it is formed on the inner diameter side by a predetermined amount h from the outer diameter surface 31 of the column portion 30.
Further, when the outer diameter side claw portion 40 is molded integrally with a part of the resin material when the cage 20 is molded with the synthetic resin material, the column portion of the conventional steel cage is caulked. Unlike the case where the claw portion is formed, the outer diameter surface (outermost diameter portion) 31 of each column portion 30 of the retainer 20 that comes into contact with the outer diameter side raceway surface (not shown) has a recess (caulking) that forms an edge. No recess) is formed, and the oil film is not cut off at the outer diameter surface 31 and the outer diameter side raceway surface of each column portion 30 of the cage 20.

Further, in the first embodiment, an annular recess 32 is formed along the circumferential direction in the axial central portion of the outer diameter surface 31 of the plurality of column portions 30. And the outer diameter side nail | claw part 40 is located in the both sides rather than the part in which the cyclic | annular recessed part 32 is formed, and has made long shape in the axial direction.
That is, in the first embodiment, the outer diameter side claw portion 40 is formed by a conventional caulking punch shown in FIG. 6 and is formed several times longer in the axial direction than the outer diameter side claw portion 140.

As shown in FIG. 3 and FIG. 4, the inner diameter side claw portions 50 are provided so as to be opposed to each other at four positions near the inner diameter side end portions of the opposing surfaces of the plurality of column portions 30. Each inner diameter claw portion 50 is formed with an inclined roller contact surface 51 that contacts the outer peripheral surface of the roller 10 accommodated in the pocket 23 and prevents the roller 10 from coming off.
Further, in the first embodiment, the inner diameter side claw portion 50 is formed longer in the axial direction than the outer diameter side claw portion 40, and the roller 10 is forcibly pushed into each pocket 23 from the outside of the cage 20. The outer diameter side claw portion 40 and the inner diameter side claw portion 50 are prevented from being detached and held.

In the roller bearing retainer according to the first embodiment configured as described above, the roller 10 accommodated in each pocket 23 of the retainer 20, for example, the inner diameter of the planetary gear of the planetary gear device has an outer diameter. When the side raceway surface is used and the outer peripheral surface of the gear shaft is assembled and used as the inner diameter side raceway surface, the outer diameter side claw portion 40 of each column 30 is displaced radially outward by the centrifugal force at the time of bearing rotation. Even so, the tip of the outer diameter side claw portion 40 does not exceed the outer diameter surface 31 of the column portion 30.
For this reason, it can prevent well that the front-end | tip of the outer diameter side nail | claw part 40 contacts the oil film of the internal peripheral surface of the inner hole of a planetary gear, and generate | occur | produces an oil film piece.
Further, by making the cage 20 made of synthetic resin (an integral molded product of synthetic resin material), the effect is great in reducing the weight as compared with a metal one.

Further, in the first embodiment, even if the axial central portion of the outer diameter surface 31 of each column portion 30 of the cage 20 is deformed radially outward by the centrifugal force at the time of bearing rotation, the outer portion of each column portion 30 is Contact with the inner peripheral surface of the inner hole of the planetary gear can be avoided by the annular recess 32 of the radial surface 31.
Furthermore, the outer diameter side nail | claw part 40 of each pillar part 30 is located in the both sides rather than the part in which the cyclic | annular recessed part 32 is formed, and is elongated in the axial direction. As a result, the outer diameter side claw portion 40 has a structure having high rigidity and is difficult to be deformed. Therefore, the effect of preventing the oil film from being cut off on the inner peripheral surface of the inner hole of the planetary gear is great.

  In addition, this invention is not limited to the said Example 1, In the range which does not deviate from the summary of this invention, it can also be implemented with a various form.

It is a perspective view which shows the roller bearing retainer which concerns on Example 1 of this invention. It is a perspective view which expands and shows a part of cage similarly. It is a longitudinal cross-sectional view which similarly shows the outer diameter side nail | claw part and inner diameter side nail | claw part formed in the opposing surface of the pillar part of a holder | retainer. It is sectional drawing based on the VI-VI line of FIG. 3 similarly. It is the expanded view which similarly shows the pocket of a holder | retainer from an outer diameter side. It is a perspective view which expands and shows the outer diameter side nail | claw part of the pillar part of the conventional cage | basket.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Roller 20 Cage 21 1st ring part 22 2nd ring part 23 Pocket 30 Column part 31 Outer diameter surface 32 Annular recessed part 33 Opposite surface 40 Outer diameter side nail | claw part 41 Roller contact surface 50 Inner diameter side nail part 51 Roller contact surface

Claims (2)

A plurality of pillar portions that connect the first and second annular portions disposed at predetermined intervals in the axial direction and the first and second annular portions and that define a plurality of pockets that store the rollers. And an outer diameter side claw portion that has a roller contact surface that protrudes from the outer diameter side portion and the inner diameter side portion of the opposing surfaces of the plurality of column portions and that makes contact with the outer peripheral surface of the roller and prevents the roller from coming off. A roller bearing retainer having an inner diameter side claw portion,
A cage is formed by integrally molding the first and second annular portions, the plurality of pillar portions, and the claw portions on the inner and outer diameter sides with a synthetic resin material,
The outer diameter side claw portion is arranged so that the tip of the outer diameter side claw portion does not exceed the outer diameter surface of the column portion when the outer diameter side claw portion is displaced radially outward by a centrifugal force during bearing rotation. A roller bearing retainer, wherein the roller bearing retainer is located on the inner diameter side by a predetermined amount with respect to the outer diameter surface of the portion and protrudes from the side surface of the column portion toward the pocket side. The roller bearing retainer according to claim 1,
An annular recess is formed in the circumferential direction in the axially central portion of the outer diameter surface of the plurality of column portions,
The outer diameter side claw portion is positioned on both sides of the portion where the annular recess is formed, and extends in the axial direction in a long shape.

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