JP2011122605A - Retainer for roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a retainer for a roller bearing, which is easy to injection-mold, can further increase the oil quantity of lubricating oil between pockets, has high dust discharge and cooling effects, and can surely prevent oil film exhaustion. <P>SOLUTION: The retainer includes annular portions 27 laterally provided with a space in the axial direction; a plurality of strut portions 28 disposed between the annular portions 27 over the whole circumference at intervals to mutually connect the annular portions 27; and a plurality of pockets 29 formed to be surrounded by the lateral annular portions 27 and the strut portions 28 at anteroposterior positions in the circumferential direction and rotatably supporting rollers. A plurality of stepped portions 30 is provided on the outer periphery of each strut portion 28 and the lateral annular portions 27, and a stepped surface 32 formed between the stepped portions 30 is formed as an inclined surface inclined in the axial direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cage in a roller bearing using a plurality of rollers as rolling elements.

Generally, among bearings that rotatably support a shaft, a roller bearing using a plurality of rollers (cylindrical rollers, needle rollers, etc.) as rolling elements includes a cage 1 formed of a cylindrical body, and the cage 1 and a plurality of rollers 2 held rotatably.
This type of cage includes left and right annular bodies 3, a plurality of struts 4 positioned between the annular bodies 3, and a plurality of pockets 5 formed between the annular body 3 and the struts 4. It is composed of

  Conventionally, there has been disclosed in Patent Document 1 as a cage that can increase the amount of lubricating oil between the pockets 5, enhance the dust discharge and cooling effects, and prevent oil film breakage.

  As shown in FIGS. 33 to 35, the cage disclosed in Patent Document 1 forms one tapered surface 6 on each of the columns 4 that are alternately adjacent to each other, and the other of the columns 4. Each post 4 is formed with another tapered surface 7, and the annular body 3 and the outer ring 9 are formed by alternately forming the wide portions 8 </ b> A and the narrow portions 8 </ b> B by the tapered surfaces 6, 7. The amount of lubricating oil between the pockets 5 constituting the cage 1 is changed through the outer oil passage 11 formed therebetween and the inner oil passage 12 formed between the annular body 3 and the inner ring 10. 4 is increased by tapered surfaces 6 and 7 formed on the inner peripheral side and the outer peripheral side.

Japanese Patent Laid-Open No. 11-22737

  By the way, the conventional cage 1 described above is made of resin and is generally manufactured by injection molding.

  However, in the conventional cage 1 described above, one of the adjacent support columns 4 is formed on the tapered surface 6 that gradually decreases in diameter from one side to the other side, and the other adjacent support column 4 is Since the taper surface 7 has a gradually decreasing diameter in the radial direction from the other side in the left-right direction to the one side, the taper angle in one column 4 is unidirectional and gradually decreases in diameter. ing.

  When the cage 1 having such a shape is formed by injection molding, there is a problem that it is difficult to accurately produce a boundary between molds for injection molding, that is, a joint portion of the mold.

  In recent years, the roller bearings have been used more and more severely, and the amount of lubricating oil between the pockets 5 has been increased, so that dust can be discharged and the cooling effect can be further improved, and oil film breakage can be reliably prevented. Is more sought after.

  Therefore, the present invention is easy to injection mold, and can further increase the amount of lubricating oil between the pockets, has a high dust discharge and cooling effect, and can reliably prevent oil film breakage. It is an object of the present invention to provide a bearing cage.

  In order to solve the above-described problems, the present invention is provided with left and right annular portions provided at intervals in the axial direction, and spaced between the annular portions over the entire circumference. A roller bearing retainer comprising a plurality of struts for connecting rollers, and a plurality of pockets formed to be surrounded by the left and right annular portions and the front and rear struts in the circumferential direction so as to rotatably support the rollers. In this embodiment, a plurality of step portions are provided on the outer peripheral surface of each of the column portions and the left and right annular portions, and the step surface formed between the step portions is an inclined surface inclined in the axial direction.

  Due to the stepped surface, a thin portion that is recessed from the outer peripheral surface of the cylindrical body is formed on the side surfaces of the left and right annular portions, and the width of the outer oil passage is increased by this thin portion. The amount of the lubricating oil increases, dust such as metal wear powder can be prevented from staying in the pocket, and the cooling effect by the lubricating oil is improved.

  Further, by changing the direction of the inclination of the step surface according to the structure of the other part around the attachment, dust in the pocket can be easily discharged and the oil permeability of the lubricating oil can be improved.

  Further, by forming the boundary of the mold for injection molding, that is, the joint portion of the mold in accordance with the stepped portion, the mold can be easily formed and the processing accuracy of the injection molding is improved.

  Furthermore, since it becomes easy to distinguish from other cages depending on how the step surfaces are set, it is possible to prevent the cage from being incorporated incorrectly.

It is a perspective view of the cage for roller bearings concerning a 1st embodiment of this invention. It is a front view of FIG. It is a side view of FIG. It is a side view which shows the use condition of FIG. It is a perspective view of the cage for roller bearings concerning a 2nd embodiment of this invention. FIG. 6 is a front view of FIG. 5. FIG. 6 is a side view of FIG. 5. It is a side view which shows the use condition of FIG. It is a perspective view of the cage for roller bearings concerning a 3rd embodiment of this invention. FIG. 10 is a front view of FIG. 9. FIG. 10 is a side view of FIG. 9. It is a side view which shows the use condition of FIG. It is a perspective view of the cage for roller bearings concerning the 4th embodiment of this invention. FIG. 14 is a front view of FIG. 13. FIG. 14 is a side view of FIG. 13. It is a side view which shows the use condition of FIG. It is a perspective view of the cage for roller bearings concerning the 5th Embodiment of this invention. It is a front view of FIG. It is a side view of FIG. It is a side view which shows the use condition of FIG. It is a perspective view of the roller bearing retainer according to the sixth embodiment of the present invention. It is a front view of FIG. It is a side view of FIG. It is a side view which shows the use condition of FIG. It is a perspective view of the cage for roller bearings concerning 7th Embodiment of this invention. FIG. 26 is a front view of FIG. 25. It is a side view of FIG. It is a side view which shows the use condition of FIG. It is a perspective view of the cage for roller bearings concerning 8th Embodiment of this invention. FIG. 30 is a front view of FIG. 29. FIG. 30 is a side view of FIG. 29. It is a side view which shows the use condition of FIG. It is a perspective view of the cage for roller bearings of a prior art example. It is a side view which shows the use condition of FIG. It is a vertical front view of FIG.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
First, a first embodiment of a roller bearing retainer according to the present invention will be described with reference to FIGS.

  The roller bearing is composed of a cylindrical cage 21 and a plurality of rollers 22, and is accommodated between an outer ring 23 and an inner ring 24 as shown in FIG. 4, and between the outer ring 23 and the cage 21. An outer oil passage 25 is formed in the formed gap, and an inner oil passage 26 is formed in the gap formed between the inner ring 24 and the cage 21.

  The roller 22 is a cylindrical roller, a needle roller, or the like.

  The cylindrical cage 21 is formed by injection molding of a resin material, and is arranged between the annular portions 27 with left and right annular portions 27 provided at intervals in the axial direction and spaced apart over the entire circumference. And a plurality of support pillars 28 that connect the annular parts 27, and a plurality of pockets 29 that are surrounded by the left and right annular parts 27 and the front and rear support parts 28 in the circumferential direction. Has been.

  On the outer peripheral surfaces of the column portions 28 and the left and right annular portions 27 constituting the cylindrical body, step portions 30 that cross in the axial direction are formed at a constant pitch in the circumferential direction.

  In the embodiment shown in FIGS. 1 to 4, a step surface 32 is formed between the step portion 30 and the step portion 30 so that the step portion 30 is located at the center of each support column 28 and surrounds each pocket 29. The

  Each step surface 32 is formed as an inclined surface that is inclined from one side in the axial direction toward the other side, and the inclination directions of adjacent step surfaces 32 are formed in opposite directions.

  As shown in FIGS. 1 and 3, the stepped surface 32, on the side surfaces of the left and right annular portions 27, has thin-walled portions 33 that are recessed from the outer peripheral surface of the cylindrical body, and are located on the side of every other pocket 29. The thin-walled portion 33 and the thick-walled portion 34 are alternately repeated.

  As a result, each step surface 32 of the embodiment shown in FIGS. 1 to 4 is formed with a thin portion 33 on one side in the axial direction and a thick portion 34 on the other side, and the width of the outer oil passage 25 is large at the thin portion 33. As a result, the amount of lubricating oil from this portion into the pocket 29 is increased, dust such as metal wear powder can be prevented from staying in the pocket 29, and the cooling effect by the lubricating oil is improved.

The column portion 28 that connects the left and right annular portions 27 has a trapezoidal cross section, and is formed so that the space between the front and back surfaces of the pocket 29 gradually decreases toward the inner peripheral side. In addition, a protruding portion 31 is formed on the inner periphery of each support column 28 and has a length slightly shorter than the axial length of the pocket 29 and protrudes from the inner wall surface of the annular portion 27 toward the inner periphery.
The inner wall surface of each pocket 29 is provided with an inner protrusion 35 having a trapezoidal cross section on the inner edge side, and an outer protrusion 36 having a mountain-shaped cross section on the outer edge side. The protrusions 36 prevent the rollers from falling off. A pair of the inner protrusion 35 and the outer protrusion 36 are formed at predetermined intervals in the axial direction.

Next, a second embodiment of the roller bearing retainer according to the present invention will be described with reference to FIGS.
In the description of the following embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  In the second embodiment shown in FIGS. 5 to 8, the inclined surface of each step surface 32 is formed into a gentle arc surface so that the contact with the mating inner surface is made smooth. This is the same as the first embodiment.

Next, a third embodiment of the roller bearing retainer according to the present invention will be described with reference to FIGS.
In the third embodiment shown in FIGS. 9 to 12, the stepped portion 30 is formed so as to be positioned at the center of the left and right wall surfaces of each pocket 29, and the stepped surface 32 in the first embodiment is formed. The pitch is shifted in the circumferential direction by half a pitch at the pitch interval of the support column 28.

Next, a fourth embodiment of the roller bearing retainer according to the present invention will be described with reference to FIGS.
The fourth embodiment shown in FIGS. 13 to 16 is an example in which the width of the step surface 32 in the circumferential direction is half the width of the step surface 32 in the first embodiment.
Therefore, the stepped portion 30 that forms the stepped surface 32 is located at the center of the support column 28 and the center of the annular portion 27 that forms the left and right wall surfaces of each pocket 29.

Next, a fifth embodiment of the roller bearing retainer according to the present invention will be described with reference to FIGS.
The fifth embodiment shown in FIGS. 17 to 20 is the same as the fourth embodiment in that the width of the step surface 32 in the circumferential direction is half the width of the step surface 32 in the first embodiment. Further, in this embodiment, each stepped surface 32 is inclined so that the axially central portion of the outer peripheral surface of the cylindrical body retainer 21 is the lowest, and the cylindrical body is held as a whole. The shape of the outer diameter of the vessel 21 is narrowed.

Next, a sixth embodiment of the roller bearing retainer according to the present invention will be described with reference to FIGS.
The sixth embodiment shown in FIGS. 21 to 24 is the same as the fifth embodiment in that it has a shape in which the central portion in the axial direction of the outer diameter of the cylindrical cage is thinned as a whole. The fifth embodiment is formed such that the stepped surface 32 is at both ends in the axial direction, one end is the thick portion 34 and the other end is the thin portion 33, whereas the sixth embodiment is both This is an example in which the step surface 32 that becomes the thick portion 34 and the step surface that both become the thin portion 33 are alternately positioned in the circumferential direction.

Next, a seventh embodiment of the roller bearing retainer according to the present invention will be described with reference to FIGS.
The seventh embodiment shown in FIGS. 25 to 28 is the seventh embodiment, whereas the sixth embodiment has a shape in which the central portion of the outer diameter of the cylindrical cage 21 in the axial direction is narrowed. The form is an example in which the central portion of the outer diameter in the axial direction is thickened, and similarly to the sixth embodiment, the step surface 32 that both become the thick portion 34 and the step surface 32 that both become the thin portion 33 Is an example in which they are alternately positioned in the circumferential direction.

Next, an eighth embodiment of the roller bearing cage according to the present invention will be described with reference to FIGS.
The eighth embodiment shown in FIGS. 29 to 32 is an example in which the central portion of the outer diameter in the axial direction of the cylindrical cage 21 is thickened similarly to the seventh embodiment. In the same manner as the fifth embodiment shown in FIGS. 17 to 20, one of the axial directions is a thin portion and the other is a thick portion.

  The cage for roller bearings according to the present invention is effectively used, for example, when it is axially supported on a carrier by an outer ring (planetary gear) and an inner ring (support pin) of a planetary gear reduction device.

21 Cage 22 Roller 23 Outer ring 24 Inner ring 25 Outer oil path 26 Inner oil path 27 Annular part 28 Strut part 29 Pocket 30 Step part 31 Projection part 32 Step surface 33 Thin part 34 Thick part 35 Inner projection part 36 Outer projection part

Claims (13)

  Left and right annular portions provided with an interval in the axial direction, a plurality of support columns disposed between the annular portions at intervals over the entire circumference, and connecting between the annular portions; In a roller bearing retainer formed by being surrounded by an annular portion and front and rear strut portions in the circumferential direction, and comprising a plurality of pockets that rotatably support the rollers, each of the strut portions and the left and right annular portions A roller bearing retainer comprising a plurality of stepped portions on an outer peripheral surface, and the stepped surface formed between the stepped portions is an inclined surface inclined in the axial direction.   The said level | step difference surface is formed in the inclined surface which inclines toward the other side from the one side of an axial direction, and the inclination direction of the adjacent level | step difference surface is formed in the reverse direction. Roller bearing cage.   Each step portion is located at the center of each support column, and a thin portion recessed from the outer peripheral surface of the cylindrical body is provided so as to be located on the side of every other pocket, and the thin portion and the thick portion The roller bearing retainer according to claim 1 or 2, wherein are repeated alternately.   The roller bearing retainer according to claim 1 or 2, wherein the slope of each step surface is formed in a gentle arc surface.   The roller bearing retainer according to claim 1 or 2, wherein the step portion is formed so as to be positioned at the center of the left and right wall surfaces of each pocket.   The roller according to claim 1 or 2, wherein the stepped portion forming the stepped surface is formed so as to be positioned at the center of the support column and the center of the annular portion forming the left and right wall surfaces of each pocket. Bearing cage.   The roller bearing retainer according to claim 1 or 2, wherein each step surface is inclined so that a central portion in the axial direction of each step surface is lowest.   8. The roller bearing retainer according to claim 7, wherein the stepped surfaces are formed at both ends in the axial direction, one being a thick portion and the other being a thin portion.   The roller bearing holder according to claim 7, wherein the stepped surface in which both of the axial directions become thick portions and the stepped surface in which both of the axial directions become thin portions are alternately positioned in the circumferential direction. vessel.   The roller bearing retainer according to claim 1 or 2, wherein each step surface is inclined so that a central portion in the axial direction of each step surface becomes the highest.   11. The roller bearing retainer according to claim 10, wherein the stepped surfaces are formed at both ends in the axial direction, one being a thick portion and the other being a thin portion.   The roller bearing holder according to claim 10, wherein the step surface having both thick portions in the axial direction and the step surface having both thin portions in the axial direction are alternately positioned in the circumferential direction. vessel.   A roller bearing using the cage according to any one of claims 1 to 12.

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