JP4239240B2 - Method for manufacturing roller bearing cage - Google Patents

Description

[0001]
[Industrial application fields]
The roller bearing retainer manufacturing method according to the present invention is used, for example, when manufacturing a retainer that is incorporated in a self-aligning roller bearing retainer and holds a plurality of spherical rollers in a rollable manner. A cage capable of reliably preventing the separation between the spherical roller and the cage is obtained stably.
[0002]
[Prior art]
For example, a self-aligning roller bearing with a cage has been conventionally used to rotatably support a heavy shaft inside a housing. Japanese Patent Laid-Open No. 5-157116 discloses a structure that can be incorporated in such a self-aligning roller bearing with a cage and effectively prevent separation of the cage and the spherical roller. Hereinafter, the conventional structure described in this publication will be described. As shown in FIG. 5, the self-aligning roller bearing with a cage has a plurality of spherical rollers 3 and 3 arranged in a freely rolling manner between an outer ring 1 and an inner ring 2 that are concentrically combined with each other. A plurality of spherical rollers 3 and 3 are prevented from being separated by retainers (press retainers) 4 and 4 formed by press-molding plates.
[0003]
An outer ring raceway 5 that is a spherical concave surface having a single center is formed on the inner peripheral surface of the outer ring 1. Further, a pair of inner ring raceways 6 and 6 are formed on the outer peripheral surface of the inner ring 2 in the respective width directions (left and right direction in FIG. 5) so as to face the outer ring raceway 5. The plurality of spherical rollers 3 and 3 are symmetrical in that the maximum diameter portion is in the center of the axial length of each spherical roller 3 and 3, and the outer ring raceway 5 and the pair of inner ring raceways 6 and 6 is arranged so as to roll freely in two rows.
[0004]
5-9, the retainer 4 has a conical cylindrical main portion 7 and an outward flange-like large diameter extending from the large-diameter side edge of the main portion 7 to the outside in the diameter direction. It has a side flange 8 and an inwardly flanged small-diameter side flange 9 extending radially inward from the small-diameter side edge. A plurality of pockets 10, 10 are intermittently formed in the circumferential direction in the main portion 7, and one spherical roller 3, 3 is rotatably held in each of the pockets 10, 10. ing. The main portion 7 is positioned on the inner side in the diametrical direction from the pitch circle of the plurality of spherical rollers 3 and 3 (a circle connecting the central axes of the plurality of spherical rollers 3 and 3). 3 prevents the main portion 7 from coming out through the pockets 10 and 10 in the diameter direction.
[0005]
Further, the outer peripheral edges of the large-diameter side flanges 8 and 8 of the pair of cages 4 and 4 are guided by being brought into sliding contact with the inner peripheral surface of the guide ring 11 respectively. The guide ring 11 is rotatably provided between the spherical rollers 3, 3 provided in plural in two rows in the axial direction. Further, the inner peripheral edge of the small-diameter side flanges 9 and 9 is guided by being brought into sliding contact with the outer peripheral surface of the end portion of the inner ring 2.
[0006]
A circular or annular recess 12 is formed in at least a portion of the both end surfaces of the plurality of spherical rollers 3 and 3 facing the large-diameter side flange portion 8. In addition, tongue pieces 13 are formed at the inner circumferential edge of the large-diameter side flange 8 at the circumferential intermediate positions of the pockets 10 and 10, respectively. Each of these tongue pieces 13 protrudes inward in the diameter direction from the inner peripheral edge of the large-diameter side flange portion 8 and is bent from the large-diameter side flange portion 8 toward the pockets 10 and to one end surface of the spherical roller 3. It is formed in a state. When the spherical roller 3 is assembled inside the pocket 10, the tip of each tongue piece 13 engages with the concave portion 12 formed on the end surface of the spherical roller 3 by the engagement allowance δ shown in FIG. Thus, the spherical roller 3 is prevented from falling off from the inside of the pocket 10. As a result, the spherical rollers 3 rotatably held in the pockets 10 and 10 can be seen from the inside of the pockets 10 and 10 even before assembly between the inner peripheral surface of the outer ring 1 and the outer peripheral surface of the inner ring 2. , It will not come out in any direction inside or outside the diameter direction.
[0007]
When the rotating shaft is supported inside the housing by the self-aligning roller bearing with cage configured as described above, the outer ring 1 is fitted and fixed to the housing, and the inner ring 2 is fixed to the rotating shaft. When the inner ring 2 rotates together with the rotating shaft, the plurality of spherical rollers 3 and 3 roll to allow this rotation. When the shaft center of the housing and the shaft center of the rotating shaft do not match, the inner ring 2 is aligned inside the outer ring 1 to compensate for this mismatch. Since the outer ring raceway 5 is formed in a single spherical shape, the rolling of the plurality of spherical rollers 3 and 3 is performed smoothly even after the mismatch compensation.
[0008]
Next, a method of manufacturing the cage 4 incorporated in the self-aligning roller bearing with cage constructed and operated as described above will be described with reference to FIG. First, a bowl-shaped second material 14 as shown in FIG. 10A is formed by subjecting a first material (not shown) such as a stainless steel plate or a rolled silicon steel plate to plastic working such as pressing. . The second material 14 includes a conical cylinder portion 15 and a bottom plate portion 16 that closes a small-diameter side end portion of the conical cylinder portion 15. Next, as shown in FIG. 5B, the center portion of the bottom plate portion 16 is punched out, and a small-diameter side flange 9 is formed near the outer periphery of the bottom plate portion 16 to form a third material 17. Next, as shown in FIG. 5C, the pocket 10 is formed in the conical cylinder portion 15 by punching a punch (not shown) for punching in the direction of the chain line α in FIG. And When the fourth material 18 is formed, a tongue piece is formed at the circumferential central portion of one axial end edge {upper end edge in FIG. 10C) of each pocket 10 positioned on the large diameter side of the conical cylinder portion 15. The element piece 19 is formed. Next, as shown in FIG. 4D, the large-diameter side flange portion 8 is formed by bending the large-diameter side end of the conical cylinder portion 15 outward in the diametrical direction, and the fifth material 20 is obtained. Further, as shown in FIGS. 5E and 5F, convex portions 21 and 21 are formed on the side surfaces of the large-diameter side flange 8 on the side facing the pockets 10, respectively, and the tongue piece The material 19 is subjected to plastic working by pressing to have a desired shape, and the tongue piece 13 is bent toward the inside of each pocket 10. Each of the convex portions 21, 21 guides the spherical roller 3 so as to face a portion of the end surface of the spherical roller 3 (FIGS. 5 to 7) held in the pocket 10 and removed from the concave portion 12.
[0009]
[Problems to be solved by the invention]
The retainer 4 constructed as described above and configured as described above effectively prevents the spherical roller 3 held in each pocket 10 from falling off (removed from each pocket 10) while facilitating the assembly work. In order to achieve this, it is necessary to accurately finish the contact allowance δ (FIG. 7) between the tip of each tongue piece 13 provided on the cage 4 side and the recess 12 provided on the spherical roller 3 side as specified. . If the engagement allowance δ is too small, the spherical rollers 3 are easily dropped from the pockets 10. On the other hand, when the engagement allowance δ is too large, the work of assembling the spherical rollers 3 in the pockets 10 becomes troublesome (the amount of the tongue piece 13 that must be elastically deformed during assembling becomes excessive).
[0010]
On the other hand, as described above, each of the tongue pieces 13 is made by plastic working the tongue piece material 19 formed when the pocket 10 is punched. At this time, there is no particular problem if the volume of the tongue piece material 19 is always an appropriate value, but it is very difficult to always maintain this volume at an appropriate value. That is, the thickness of a metal plate such as a stainless steel plate as the first material is not completely uniform, and it is inevitable that a minute dimensional error exists. Further, when the first material is plastically processed, a part of the metal plate is stretched, but the degree of stretching may be slightly different for each processing. As a result, the volume of the tongue piece material 19 is slightly different.
[0011]
Regardless of the volume error of the tongue piece material 19, when the tongue piece 13 is formed by plastic processing on the tongue piece material 19, the volume of the molding die is adjusted to the optimum volume of the tongue piece 13. In comparison, the volume of the tongue piece material 19 may be excessive or conversely insufficient. When the amount is excessive, the tongue piece material 19 cannot be sufficiently suppressed by the molding die, and the shape of the obtained tongue piece 13 becomes not only irregular, but also the spring back after plastic working. As a result, the above allowance δ cannot be secured. On the other hand, if the amount is insufficient, the resulting tongue piece 13 is thinned, and the above allowance δ cannot be secured.
[0012]
In order to sufficiently secure the hooking allowance δ, the amount of bending of the tongue piece 13 toward the pocket 10 may be increased. However, when such a structure is adopted, the volume of the tongue piece material 19 is increased. Is an appropriate value, the engagement allowance δ becomes excessive, and the work of assembling the spherical rollers 3 in the pockets 10 becomes troublesome.
The method for manufacturing a roller bearing retainer of the present invention was invented to eliminate all of these disadvantages.
[0013]
[Means for Solving the Problems]
The method for manufacturing a roller bearing cage according to the present invention includes a cylindrical main portion made of a metal plate, and formed intermittently in the circumferential direction in the main portion so that the rollers can be freely rolled inside. A plurality of pockets, a flange-like flange that is bent in the diameter direction from one axial end edge of the main portion, and a circumferential direction center portion of each pocket at the periphery of the flange, and a diameter direction from the periphery And is formed in a state of being bent from the collar portion toward the pocket side and engaged with a recess formed on the end surface of the roller held in the pocket to prevent the roller from coming out of the pocket. And a roller bearing retainer having a tongue piece having a desired shape and volume.
[0014]
In particular, in the method for manufacturing a roller bearing retainer according to the present invention, when the tongue piece is formed, the tongue piece piece having an excessive volume compared to the required volume of the tongue piece is used. Then, the tongue piece is placed in a tongue processing space formed between a pair of molds, and the tongue piece is placed in the tongue processing space. A force in the compression direction is applied to form a tongue having the desired shape and volume, and the excess volume is transferred between the two molds from the tip of the tongue processing space. formed outward of the processing space, extruding the relief space, a burr which projects on the opposite side of the pocket, released to the space outside for the tongue machining for machining the tongue, Leave as it is.
[0015]
[Action]
According to the method for manufacturing a roller bearing retainer of the present invention configured as described above, the shape and volume of the tongue piece are regulated to a desired value, and the tip portion of the tongue piece and the recess formed on the end surface of the roller It is possible to effectively prevent the roller held in each pocket while keeping the assembling work easy by restricting the allowance to the appropriate value. That is, since the volume of the tongue piece is excessive compared with the volume of the tongue piece, the resulting tongue piece is not thin. Moreover, the excess volume fraction as burrs are formed from the tip of the tongue piece processing space for processing the tongue outwardly, due to release the relief space, most of the tongue piece in the portion remained in the tongue machining space portion is pressed to the normal between the mold between a pair constituting the tongue working space. As a result, it is possible to prevent the shape of the tongue from becoming irregular or increasing the amount of spring back after plastic working. In addition, when the roller bearing retainer manufactured as described above is incorporated in the bearing, the burr protrudes on the opposite side of the pocket, so that this burr interferes with a part of the roller, etc. There is no loss of functionality.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
1 to 4 show an example of an embodiment of the present invention. First, with reference to FIGS. 1 to 3, the structure of a roller bearing cage manufactured by the manufacturing method of the present invention will be described. The illustrated example shows a cage for a self-aligning roller bearing manufactured by the manufacturing method of the present invention. However, the manufacturing method of the present invention is not limited to a cage for a self-aligning roller bearing, but can also be applied to the manufacture of a cage for a cylindrical roller bearing or a cage for a tapered roller bearing.
[0017]
The retainer 4a manufactured by the manufacturing method of the present invention includes a conical cylindrical main portion 7 and a large-diameter side edge of the main portion 7 as in the conventional retainer 4 shown in FIGS. A large-diameter side flange 8 having an outward flange shape extending outward in the diameter direction from the portion, and a small-diameter side flange portion 9 having an inward flange shape extending inward in the diameter direction from the small-diameter side end edge portion. A plurality of pockets 10 and 10 are intermittently formed in the main portion 7 in the circumferential direction, and one spherical roller 3 is rotatably held in each of the pockets 10 and 10. Further, by positioning the main portion 7 on the inner side in the diameter direction than the pitch circle of the plurality of spherical rollers 3, the spherical rollers 3 come out to the inner side in the diameter direction of the main portion 7 through the pockets 10, 10. To prevent things.
[0018]
A tongue piece 13a is formed at the inner circumferential edge of the large-diameter side collar 8 at the middle position of the pockets 10 and 10 in the circumferential direction. Each tongue piece 13a protrudes inward in the diametrical direction from the inner peripheral edge of the large-diameter side collar part 8, and faces the one end surface of the spherical roller 3 from the large-diameter side collar part 8 toward the pockets 10 side. It is formed in a bent state. The tip of each tongue piece 13a engages with the recess 12 formed on the end surface of the spherical roller 3 by the engagement allowance δ shown in FIG. The spherical roller 3 is prevented from falling off from the inside of the pocket 10.
[0019]
In particular, in the case of the retainer 4a made by the manufacturing method of the present invention, a burr 22 that protrudes on the opposite side of each pocket 10 is formed at the tip of each tongue piece 13a. Since such a burr 22 forms each tongue piece 13a, the volume of the tongue piece piece 19 {FIG. 10 (C)} formed on the fourth material 18 is slightly smaller than the volume of the tongue piece 13. It is formed by keeping it in excess. That is, the burr 22, the excess volume fraction of the tongue material 19 is formed by escape to the space outside for forming the tongue piece 13a. And when implementing the manufacturing method of the roller bearing retainer of this invention, this burr | flash 22 protrudes on the opposite side to the said pocket 10, and the part except the said burr | flash 22 is a desired shape. And the process of processing the said tongue piece piece 19 into the said tongue piece 13a is devised so that it may become volume.
[0020]
FIG. 4 shows a main part of a mold apparatus used when the tongue piece 19 is processed into the tongue 13a. The mold apparatus has a pair of molds 23a and 23b, and the large-diameter side flange 8 and the tongue piece 19 formed on the fourth material 18 between the molds 23a and 23b. Is strongly clamped from both sides in the axial direction {vertical direction in FIG. 10D, front and back direction in FIG. 10F}, the tongue piece 19 is plastically deformed to form the tongue 13a. For this purpose, a tongue piece processing space 25 is provided at one end (the lower end in FIG. 4) of the processing space 24 formed between the pair of molds 23a, 23b. The inner surface shape of the tongue piece processing space 25 matches the outer surface shape of the tongue piece 13a to be processed. Further, the thickness of the tongue piece processing space portion 25 increases toward the tip edge from the tip portion (lower end portion in FIG. 4) toward the outside of the tongue piece processing space portion 25 (downward in FIG. 4). A small wedge-shaped relief space 26 is formed.
[0021]
At the time of processing the tongue piece 13a, the large-diameter side flange 8 and the tongue piece element 19 are strongly held from both sides in the axial direction between the pair of molds 23a, 23b, and the tongue piece processing space 25 is formed. A strong force in the compression direction is applied to the tongue piece 19, and the tongue piece 19 is plastically deformed to obtain the tongue 13a having the desired shape and volume. At this time, a surplus of the volume of the tongue piece 19 with respect to the volume of the tongue 13 a is pushed into the escape space 26 and becomes the burr 22. The burr 22 is left without being removed.
[0022]
According to the method for manufacturing a roller bearing cage of the present invention configured as described above, the shape and volume of the tongue piece 13a are regulated to a desired value, and the tip of the tongue piece 13a and the spherical roller 3 The allowance δ with the recess 12 formed on the end face can be regulated to an appropriate value. For this reason, the amount of elastic deformation of the tongue piece 13a required when pushing the spherical roller 3 into the pocket 10 is not excessive, and the assembly work of the spherical roller 3 to the retainer 4a is facilitated. It is possible to effectively prevent the spherical rollers 3 held in the pockets 10 from slipping.
[0023]
That is, since the volume of the tongue piece 19 is made excessive compared to the volume of the tongue 13a, the resulting tongue 13a is not thin. Further, since the excess volume escapes to the escape space 26 continuous to the outside of the tongue piece processing space portion 25 for processing the main body portion of the tongue piece 13a as the burr 22, most of the tongue piece element piece 19 The portion remaining in the tongue piece processing space 25 is normally pressed between the pair of molds 23a, 23b constituting the tongue piece processing space 25. As a result, it is possible to prevent the tongue 13a from becoming irregular in shape or increasing the amount of spring back after plastic working. In addition, when the cage 4a manufactured as described above is incorporated in a self-aligning roller bearing, the burr 22 protrudes on the opposite side of the pocket 10, so that this burr 22 is part of the spherical roller 3. to interfere with, etc., never compromising the function of the self-aligning roller bearings.
[0024]
【The invention's effect】
Since the method for manufacturing a roller bearing retainer according to the present invention is configured and operates as described above, it is possible to reliably prevent the rollers held in the pockets from being loosened while facilitating the assembly work. It can contribute to the realization of a roller bearing that is easy to handle and inexpensive.
[Brief description of the drawings]
FIG. 1 is a partial perspective view of a cage made by the manufacturing method of the present invention.
FIG. 2 is a view corresponding to the AA cross section of FIG.
3 is a cross-sectional view taken along the line BB of FIG. 2 in a state where the rollers are not held.
FIG. 4 is a partially enlarged cross-sectional view of a mold apparatus for forming a tongue piece.
FIG. 5 is a partial sectional view of a self-aligning roller bearing incorporating a cage.
6 is a cross-sectional view taken along the line CC of FIG. 7, showing the cage taken out.
7 is a sectional view taken along the line DD of FIG. 6;
FIG. 8 is a partial perspective view of the cage as seen from the outer peripheral side.
FIG. 9 is a partial perspective view as seen from the inner periphery side.
FIGS. 10A to 10D show a manufacturing method of a cage in the order of steps, wherein FIGS. 10A to 10D are cross-sectional views, FIG. 10E is a view of a large-diameter side collar portion viewed from the outer periphery, and FIG. ) Viewed from below.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 3 Spherical roller 4, 4a Cage 5 Outer ring raceway 6 Inner ring raceway 7 Main part 8 Large diameter side collar part 9 Small diameter side collar part 10 Pocket 11 Guide ring 12 Recess 13, 13a Tongue piece 14 Second material 15 Conical Tube portion 16 Bottom plate portion 17 Third material 18 Fourth material 19 Tongue piece element 20 Fifth material 21 Convex portion 22 Burrs 23a, 23b Mold 24 Processing space 25 Tongue piece processing space portion 26 Escape space

Claims (1)

A cylindrical main part made of a metal plate, a plurality of pockets which are intermittently formed in the main part in the circumferential direction so as to be able to hold the rollers in a freely rolling manner, and the axial direction of the main part A flange-shaped flange that is bent in the diameter direction from one edge, a circumferential center of each pocket at the periphery of the flange, and a diameter that protrudes from the periphery to the pocket side from the periphery A tongue having a desired shape and volume, which is formed in a bent state and engages with a recess formed on an end face of the roller held in the pocket to prevent the roller from coming out of the pocket. In the method of manufacturing a roller bearing retainer, a tongue piece piece having an excessive volume compared to a required volume of the tongue piece is formed when the tongue piece is formed. After forming the tongue piece into a pair of molds Place the tongue working space portion formed between, with the tongue piece machining space portion by applying a force in the compression direction to the tongue piece, the tongue having the desired shape and volume , excess volume fraction, extruded into relief space formed toward the outside of the tongue working space from the tip of the tongue working space between the molds to each other, and the pockets burrs projecting to the opposite side, escape to the tongue machining space outside for processing the tongue, the manufacturing method of it bearing retainer rollers, characterized in that left intact.

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