JP2013087874A - Roller bearing retainer - Google Patents

Abstract

A roller bearing capable of preventing a decrease in the number of rollers and a roller length and a decrease in bearing load capacity due to a decrease in the number of rollers and the roller length due to the division of the split cage for the roller bearing. A cage is provided.
SOLUTION: Two annular ear portions 11 facing opposite ends of a roller 2 constituting a roller bearing 1 and a plurality of column portions 12 connecting the both ear portions 11 in the axial direction are provided. A roller bearing retainer 10 which defines a plurality of pockets for holding a roller in a rollable manner by the two ear portions 11 and the column portion 12, and a pair of ear portions forming at least one pocket 11 has a bent portion 11a that forms one pocket 13a by being bent into an S-shaped cross section.
[Selection] Figure 2

Description

  The present invention relates to a roller bearing retainer used for a roller bearing such as a needle roller bearing, and more particularly to a roller bearing retainer used for an automobile transmission or the like.

  2. Description of the Related Art Conventionally, as input shafts and intermediate shafts for automobile transmissions, stepped portions are sometimes formed on both sides of a roller bearing built-in portion due to structural limitations of the device. To incorporate the roller bearing into the shaft, it is necessary to increase the diameter of the cage that holds the roller and increase the inscribed circle diameter of the roller in order to get over the stepped portion of the shaft. Conventionally, as a cage capable of expanding the diameter, a split roller bearing is used which is cut at one or two places on the circumference.

  When the division position of the cage is the pocket portion, there is a problem that the rollers cannot be incorporated into the pocket at the division position, the number of rollers is reduced, and the bearing load capacity is reduced. Thus, a split type rolling bearing cage has been proposed in which the divided portions of the divided cage are used as the ear portions on both sides of the pocket, and the ear portions of the divided portions are combined and integrated after assembly. (See Patent Document 1)

JP-A-10-281165

  However, in the cage of the proposed type in which the divided ear portions are assembled and assembled, it is necessary to widen the width of the ear portions on both sides of the divided portion because of the structure. There is a problem that the bearing load capacity is reduced. In addition, this type of cage cannot be pre-mounted with rollers in the pockets of the divided portions, and the assembly into the shaft becomes complicated.

  The present invention is a roller bearing retainer that can prevent a decrease in the number of rollers, a decrease in roller length, and a decrease in bearing load capacity due to a decrease in the number of rollers and the roller length due to the division of the split cage for roller bearings. The purpose is to provide a vessel.

  In addition, the present invention provides the number of rollers incorporated in the bearing, the reduction of the roller length, and the bearing load capacity associated with the reduction of the number of rollers and the roller length due to the division of the roller type split cage. It is an object of the present invention to provide a roller bearing retainer that can prevent the lowering and can be easily assembled into a stepped shaft by attaching a roller to the retainer before assembly.

  In order to solve the above-mentioned problem, the structural feature of the invention according to claim 1 is that two annular ear portions facing opposite ends of the rollers constituting the roller bearing, and the both ear portions are axially arranged. A roller bearing retainer having a plurality of column portions connected to each other and defining a plurality of pockets for holding the rollers in a rollable manner by the two ear portions and the column portions facing each other. One set of ears forming a pocket has a bent portion that forms one pocket by being bent into an S-shaped cross section.

  According to the cage of the present invention, the bent portion is substantially arc-shaped before being assembled into the shaft, and has a larger diameter than the folded portion after being assembled, so that the stepped portion of the shaft to be assembled can be easily overcome. it can. Further, according to the cage of the present invention, the ear portion has a circumferentially continuous structure, and does not require a coupling means for rejoining the cut portion. For this reason, it is not necessary to widen the width | variety of an ear | edge part, a normal roller can be integrated and load capacity does not fall.

  In order to solve the above problems, a structural feature of the invention according to claim 2 is that the roller bearing retainer is formed of a resin material.

  According to the present invention, since the resin material has a smaller deformation resistance than the metal material, it can be easily bent, and the bent portion can be easily formed after the cage is assembled on the shaft.

  In order to solve the above-described problem, a structural feature of the invention according to claim 3 is that a thin portion by thinning is formed in the bent portion of the pair of ear portions.

  According to the above configuration, when the cage is assembled on the shaft by the thin portion of the ear portion, the bent portion can be easily folded and the dimension after formation can be stabilized.

  In order to solve the above problems, a structural feature of the invention according to claim 4 is that a part of the ear portion of the bent portion has a protrusion protruding toward the circumferential pocket.

  According to the said structure, it can prevent that the said bending part after incorporating a holder | retainer into an axis | shaft by the protrusion of the said ear | edge part expands a diameter by elasticity.

  In order to solve the above-described problem, the structural feature of the invention according to claim 5 is that a pocket is constituted by a part of both ears facing each other in the axial direction in the bent part and one pillar part, and The holding plate for holding the rollers is provided.

  According to the above configuration, since the rollers can be held before folding in the pockets of the bent portions formed by bending, the assembly man-hours can be greatly increased by incorporating the bearings into the shaft with all the rollers mounted on the cage. Can be reduced.

  In order to solve the above-mentioned problem, the structural feature of the invention according to claim 6 is that the roller holding plate is formed of a steel material.

  According to the present invention, since the holding plate is formed of a steel material having a strength higher than that of the resin material and having a large deformation resistance, the thickness of the holding plate can be made thinner than that of the resin material. Larger diameter rollers can be used.

  According to the present invention, for roller bearings, it is possible to prevent a decrease in the number of rollers and the roller length and a decrease in bearing load capacity due to the decrease in the number of rollers and the roller length due to the division of the split cage for roller bearings. A cage can be provided. Furthermore, it is possible to provide a roller bearing retainer in which a roller can be easily assembled into a stepped shaft by attaching a roller to the retainer before assembling.

It is a front view of the cage for roller bearings of the embodiment of the present invention. It is an enlarged front view of the bending part of the holder | retainer of FIG. It is an expansion perspective view of the bending part of the holder | retainer of FIG. It is an expansion perspective view of the bending part before bending of the holder | retainer of FIG. It is explanatory drawing explaining the assembled state of the roller bearing retainer of embodiment of this invention. It is a front view of the diameter-expanded state of the cage for roller bearings of the embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of a roller bearing retainer according to a first embodiment of the present invention after being assembled into a shaft.
2 is an enlarged front view of a bent portion of the cage of FIG. 1, and FIG. 3 is an enlarged perspective view of the bent portion of the cage of FIG.

  As shown in FIGS. 1 to 3, a roller bearing cage 10 (hereinafter referred to as a cage 10) forms a bearing portion 1 by rotatably holding a plurality of rollers 2 between a shaft 3 and an outer ring member 4. doing. The cage 10 includes a main body portion that is formed in a ring shape by injection molding of a resin such as reinforced preamide, and a holding plate 14 that is formed by pressing a steel plate.

  As shown in FIGS. 2 and 3, the cage 10 is composed of two ears 11 and a plurality of pillars 12 facing each other in the axial direction, and the pillars 12 are formed with concave surfaces on both sides in the circumferential direction. The both ear portions 11 are connected in the axial direction, thereby partitioning and forming a plurality of pockets 13 and two pockets 13a for holding the plurality of rollers 2 in a rollable manner.

  Further, the two ear portions 11 facing each other in the axial direction at two symmetrical places on the circumference form bent portions 11a. A pocket 13a is defined by the two bent portions 11a facing each other in the axial direction and the two column portions 12 adjacent to each other. The two pockets 13 a have a larger circumferential width than the other plurality of pockets 13. Since both ears 11 facing each other have the same shape, the following description will be given only for one ear 11. Since the two bent portions 11a have the same shape, the following description will be given only for one bent portion 11a.

  The bent portion 11a extends from the inner diameter portion of the ear portion 11 in the right direction of the circumference in the drawing, and from the right end portion of the inner ear portion 11b to the left in the drawing along the outer diameter portion of the inner ear portion. The middle ear portion 11c that is bent and extends, and the outer ear that is bent from the left end portion of the middle ear portion 11c in the drawing along the outer diameter portion of the middle ear portion to the right in the circumferential direction in the drawing and extends to the end portion of the bent portion 11a. It is formed in the S shape which consists of the part 11d.

  FIG. 4 is an enlarged perspective view of the bent portion 11a of the cage 10 before being bent. Here, the bent portion 11a before bending will be described.

  The two bent portions 11a opposite to each other in the circumferentially symmetrical two axial directions are the inner ear portion 11b extending from the inner diameter portion of the ear portion 11 in the right direction of the circle on the drawing, and the ear portion 11 from the right end portion in the figure of the inner ear portion 11b. The middle ear portion 11c extends obliquely outward in the radial direction to the outer diameter portion, and the outer ear portion 11d extends from the right end portion of the middle ear portion 11c to the end portion of the bent portion 11a from the right end portion in the drawing.

The radial thicknesses tb, tc, and td of the inner ear portion 11b, the middle ear portion 11c, and the outer ear portion 11d are smaller than 1/3 of the radial thickness t of the ear portion 11, respectively.
Further, a thin portion 11g due to a radially outward thinning is formed at a contact point between the inner ear portion 11b and the middle ear portion 11c, and a thinned portion 11h due to a thinning is formed at the contact point between the middle ear portion 11c and the outer ear portion 11d.

  The length L of the middle ear portion 11c satisfies L> (D82−D31) × Π / n, where D31 is a diameter of a track portion 31 of the shaft 3 described later and D32 is an outer diameter of the step portion 32. Here, Π is the circumferential ratio, and n is the number of the bent portions 11a, which is 2 in the present embodiment. The length of the inner ear portion 11b is substantially equal to the length L of the middle ear portion 11c, and the length of the outer ear portion 11d is longer than the length L of the middle ear portion 11c.

  A recess 11e is formed on the pocket 13a side of the outer peripheral portion of the contact between the middle ear portion 11c and the outer ear portion 11d. The holding plate 14 has a circular arc shape whose cross section is concave on the pocket 13 a side, the length is equal to the axial length of the pocket 13 a, and the width is equal to the radial thickness t of the ear portion 11. Further, a locking projection 14b is formed at one end in the width direction at both ends in the longitudinal direction, and the locking projection 14b is formed in the recess 11e at the contact point between the middle ear portion 11c and the outer ear portion 11d. By being inserted, it is locked to the ear 11.

  The holding plate 14 is positioned slightly larger than the diameter of the roller 2 in which the distance from the bottom of the concave surface of the column portion 12 on the base side of the outer ear portion 11d of the pocket 13a to the bottom of the base side concave surface of the outer ear portion 11d of the holding plate 14 is incorporated. It is locked to. Further, the distance from the radially outer end portion of the concave surface 12a of the pillar portion 12 to the radially outer end portion of the concave surface 14a of the holding plate 14, and the radially inner end portion of the concave surface 12a of the pillar portion 12 To the radially inner end of the concave surface 14a of the holding plate 14 is slightly smaller than the diameter of the roller 2 to be incorporated.

  Due to the distance relationship between the concave surface 12a of the column portion 12 and the concave surface 14a of the holding plate 14, the roller 2 is held without dropping between the concave surface 12a of the column portion 12 and the concave surface 14a of the holding plate 14. Has been. Further, by pressing the roller 2 in the radial direction, the column portion 12 is elastically deformed, and the roller 2 can be easily inserted between the concave surface 12 a of the column portion 12 and the concave surface 14 a of the holding plate 14.

A protrusion 11f is formed on the outer peripheral side end portion radially outward from the root of the inner ear portion 11b of the bent portion 11a so as to protrude in the circumferential direction toward the pocket 13a. The protrusion 11f is interposed radially outward at the left end of the contact between the middle ear portion 11c and the outer ear portion 11d in the drawing.
The protrusion 11f prevents the bent portion from expanding due to elasticity, and keeps the bent portion 11a in an S shape.

FIG. 5 is an explanatory view for explaining the assembled state of the roller bearing cage of the embodiment of the present invention.
The shaft 3 is an input shaft for an automobile transmission, and stepped portions are formed on both sides of the bearing built-in portion due to structural limitations of the apparatus. In order to mount the bearing 1 composed of the cage 10 and the plurality of mounted rollers 2 over the step portion 32 of the shaft 3 into the shaft 3, the diameter of the cage 10 of the bearing 1 is increased, and the roller 2 is inscribed. The diameter of the circle needs to be larger than the outer diameter D32 of the step 32 of the shaft 3.

FIG. 6 is a front view of the roller bearing retainer according to the embodiment of the present invention in a state where the diameter is increased.
A plurality of rollers are held between the holding plate 14 and the column portion 12 of the pocket 13a of the bent portion formed by a plurality of pockets 13 and two bent portions. The cage 10 holding the plurality of rollers 2 in this state is elliptical. When the cage 10 is an elastic body and is deformed into a perfect circle by a jig with all the rollers mounted on the cage, the length L of the middle ear portion 11c is L> (D82-D31) as described above. By satisfying xΠ / 2 / n, the inscribed circle diameter of the roller 2 becomes larger than the outer diameter D32 of the step portion 32.

The bearing portion 1 is bent around the raceway portion 31 in the axial direction beyond the step portion 32 from the end portion of the shaft 3 in a state where the expanded cage 10 is deformed into a perfect circle, and then the cage 10 is bent. By bending the portion 11a, the diameter is reduced and the track 11a is mounted at a predetermined position.
Further, since the contact between the inner ear portion 11b and the middle ear portion 11c and the contact between the middle ear portion 11b and the outer ear portion 11c have thin portions 11g and 11h due to thinning, it is easy to bend the bent portion 11a.

  Conventionally, as a bearing retainer used for the stepped shaft shown in FIG. 5, a split type rolling bearing with a cut in one or two places on the circumference is used. In the case of a cage having a cut portion in the ear portion used for the split type rolling bearing, it is necessary to widen the ear width compared to a normal cage in order to ensure the strength of the ear portion. The direction length becomes shorter and the load capacity of the bearing becomes smaller.

  According to the roller bearing retainer 10 of the embodiment of the present invention, the retainer is not divided, the number of rollers, the decrease in the roller length, and the number of rollers due to the division of the roller bearing type retainer, It is possible to prevent a decrease in bearing load capacity due to a decrease in roller length. Furthermore, according to the roller bearing retainer 10 of the embodiment of the present invention, it is easy to incorporate the bearing into the stepped shaft by attaching the roller to the retainer before assembling.

  In the above-described embodiment, the roller bearing retainer formed of resin has been described. However, in the present invention, a roller bearing retainer formed of a metal material such as a press-formed steel plate may be used.

  In the above-described embodiment, the roller bearing retainer having the protrusion for preventing the expansion of the diameter at the bent portion has been described. However, the present invention does not have the protrusion for preventing the expansion of the diameter at the bent portion, and prevents the diameter expansion by a frictional resistance or the like. A type of roller bearing cage may be used.

  In the above-described embodiment, a roller bearing cage having a holding plate formed of a steel plate has been described. However, in the present invention, a roller bearing cage having a holding plate formed of resin or the like may be used.

  In the above-described embodiment, the roller bearing retainer having the retaining plate formed of the steel plate has been described. However, in the present invention, there is no retaining plate, and the roller bearing retainer of the type in which the roller is directly inserted into the pocket of the bent portion. It may be a vessel.

DESCRIPTION OF SYMBOLS 1 ... Bearing 10 ... Cage 11 ... Ear part 11a ... Bending part 11f ... Protrusion 12 ... Pillar part 13, 13a ... Pocket 14 ... Holding plate 2 ... Roller 3 ... Shaft 32 ... Step part

Claims (6)

  Two annular ears facing the both ends of the roller constituting the roller bearing, and a plurality of pillars connecting the both ears in the axial direction, and the both ears and the pillars facing each other A roller bearing retainer that defines a plurality of pockets that hold the rollers in a rollable manner, and is bent by a pair of ears that form at least one pocket into a S-shaped cross section. A roller bearing retainer having a bent portion forming two pockets.   The roller bearing cage according to claim 1, wherein the roller bearing cage is formed of a resin material.   The roller bearing retainer according to claim 2, wherein a thin portion is formed at the bent portion of the pair of ear portions by thinning.   4. The roller bearing retainer according to claim 2, wherein a protrusion protruding toward a circumferential pocket is provided on a part of the ear portion of the bent portion. 5.   5. A holding plate for holding a roller is formed by forming a pocket by a part of both ear portions facing each other in the axial direction in the bent portion and one pillar portion. A cage for roller bearings according to any one of the above.   6. The roller bearing retainer according to claim 5, wherein the roller holding plate is made of a steel material.

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