JP2005147364A - Holder for roller bearings, and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a holder for a conical roller bearing which can improve a fatigue fracture resistance and fatigue life. <P>SOLUTION: This invention is intended for the holder for a circular conical roller bearing situated between the inner ring and the outer ring of a bearing and constituted that a plurality of square-shaped pocket holes 16 to contain a roller 20 are formed at intervals in the periphery. Marginal expansion parts 17 protruding outward and formed by burring processing are situated on all round the pocket hole 16, and the roller 20 is guided and held by the marginal expansion part 17. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a roller bearing retainer for holding a plurality of rollers in a roller bearing, for example, a tapered roller bearing or the like, provided in a rotating mechanism portion of various mechanical devices, and a manufacturing method thereof.

  A roller bearing using a cylindrical roller, a tapered roller, a needle roller, a spherical roller, or the like as a rolling element has a larger load capacity and higher rigidity than a ball bearing, and is therefore preferably used for a rotation support portion where a large load is applied. . Above all, tapered roller bearings incorporating a truncated cone roller can support both radial and thrust loads, and have a large load resistance. Therefore, drive devices, reduction gears, axles in automobiles, railway vehicles, various mechanical devices, etc. Widely used in parts.

  As shown in FIG. 8, the tapered roller bearing (1) has an inner ring (2) provided with a tapered inner ring raceway (2a) on the outer peripheral surface, and a tapered outer ring raceway (3a) provided on the inner peripheral surface. A plurality of tapered rollers (4) disposed between the inner ring raceway (2a) and the outer ring raceway (3a) are incorporated between both wheels (2) and (3). It is held by a cage (5) so as to roll freely.

  As shown in FIG. 9, the cage (5) includes, for example, a large-diameter annular part (5a) provided on the upper end side, and a coaxial core with the large-diameter annular part (5a) provided on the lower end side. A small-diameter annular part (5b) arranged on the upper side and a plurality of pillar parts (5c) arranged between the annular parts (5a) and (5b) and arranged at predetermined intervals in the circumferential direction. It is composed of a metal press-molded product that is integrally formed. The cage (5) has a plurality of rectangular pocket holes (6) surrounded by the upper and lower circular parts (5a) (5b) and the adjacent column part (5c) at a predetermined interval in the circumferential direction. The roller (6) is provided at intervals, and is configured to be accommodated and held in each pocket hole (6) so as to be freely rollable.

  Such a metal tapered roller bearing retainer (5) is usually constituted by a press-molded product obtained by pressing a metal plate. As this metal plate material, steel plates such as SPCC (JIS standard: cold rolled steel plate), SPHC (JIS standard: hot rolled steel plate), SPB1 and SPB2 (BAS standard (Japanese bearing industry standard): low carbon steel plate) are used. It has been.

When manufacturing the above-mentioned tapered roller bearing retainer (5) by pressing, for example, as shown in Patent Document 1 below, a blank obtained by punching a steel plate material is subjected to pressing such as drawing. A substantially cylindrical drawn product having a taper on the peripheral wall is obtained. The peripheral wall of the drawn product is punched at a predetermined interval to form a plurality of rectangular pocket holes (6). Further, the column portion (5c) between the pocket holes (6) is chamfered to form a chamfered portion for guiding the rollers (4). Further, the lower wall of the drawn product is punched to form a small-diameter annular portion (5b), and the upper edge is further cut to form a flat large-diameter annular portion (5a).
JP-A-8-326761 (first column 37 line-3 column 1 line, FIG. 5) Japanese Patent Publication No. 48-7972 (Claims, Fig. 1-2) JP 2003-21146 (Claim 1, FIG. 1)

  In the tapered roller bearing (1) having the cage (5), a load due to vibration during operation rotation is applied to the cage (5), and the stress due to this load is applied to the pocket hole (6) in the cage (5). It is concentrated on the corner (6a). Due to this stress concentration, a tensile force for expanding the corner portion (6a) is repeatedly generated at the corner portion (6a), and fatigue failure occurs. Thereby, for example, there is a problem that a crack starting from the corner (6a) is generated, or in some cases, the crack grows large and damages the cage itself. Especially in the technical field of bearings for railway vehicles, the fatigue life strength can be improved by improving fatigue fracture resistance as much as possible by increasing the use conditions associated with higher speeds and simplifying maintenance due to labor reduction. It has been demanded.

  Conventionally, the following countermeasures have been studied for such a fatigue fracture problem.

  For example, it is possible to take measures to increase the fatigue fracture resistance by increasing the thickness of the steel plate constituting the cage. However, if the plate thickness is increased, the rotational torque increases due to the increase in weight, and good rotational characteristics cannot be obtained, and the inertial force increases due to the increase in weight, so that the impact load also increases. It is not suitable for applications where impact loads are applied. Further, when manufacturing the cage, there are many problems that the material cost is high, and equipment with a large processing capacity is required, which causes an increase in cost.

  In addition, it is conceivable to use a high strength material such as a high carbon steel plate as the steel plate material of the cage. However, in that case, a number of processing problems occur, such as cracking during press molding, and drawing cannot be performed to the accuracy required for the product.

  Further, as shown in Patent Document 2, a technique for increasing the strength of the cage by subjecting the cage to heat treatment such as rapid heating and quenching has been proposed.

  However, this method has a problem that the assembly work of the cage cannot be performed smoothly. That is, in normal bearing assembly work, the cage is deformed so that its column portion is pushed outward in advance, and in that state, the rollers are stored in the pocket holes of the cage, and the cage is used as the inner ring. After the fitting, the pillar portion of the cage is swaged to prevent the cage and the rollers from being pulled out, and then the outer ring is fitted into the assembly. However, if the cage is hardened by heat treatment, there is a risk of cracking and breakage when caulking the column portion of the cage. Furthermore, when the cage is heat-treated, there is a concern that the dimensional accuracy such as roundness may be reduced due to the adverse effect of heat and the quality may be lowered.

  In addition, a plan to increase the radius of curvature of the corner of the cage pocket hole to prevent stress from concentrating on the corner has been studied. Further, it is necessary to chamfer the corners of the tapered roller, the effective contact area of the roller with the cage is reduced, and problems such as a reduction in bearing load capacity occur.

  On the other hand, in the conventional cage described above, the inner side in the plate thickness direction on both side surfaces of the pocket hole inner peripheral surface is chamfered by coining to form a guide surface for the roller. Since the size is less than half the plate thickness, it may be difficult to keep the rollers in a stable state.

  Further, when surface pressure is applied by coining, the peripheral edge of the pocket hole is deformed due to the movement of the meat, and the pocket length and the pocket width are changed, and the dimensional accuracy may be lowered.

  Further, in the above cage, since the pocket hole is formed by punching, more than half of the inner peripheral surface of the pocket hole is a rough surface (fracture surface) due to fracture, and the smooth shear surface is a plate. It is limited to a narrow range of less than half the thickness. Usually, in a tapered roller bearing, since the end surface (large-diameter side end surface) of the tapered roller contacts the narrow smooth surface, the load during rotation is concentrated on the narrow smooth surface, resulting in wear. Is likely to occur and the durability is reduced.

  In addition, what is shown to the said patent document 3 is well-known as a technique which increases the smooth surface of a pocket hole inner peripheral surface. In this technique, a pocket hole is formed by punching, and then the inner peripheral surface of the hole is pressed to increase the smooth surface. However, in order to prevent uneven thickness due to pressing, it is difficult to secure a smooth surface of about 70% or more of the plate thickness in the case of a thick steel plate, and the size of the smooth surface (roller contact surface) is small. There is still room for improvement, such as restrictions.

  The present invention has been made in view of the above circumstances, and can prevent deterioration in dimensional accuracy and the like, obtain high quality, improve fatigue life, and maintain rollers in a stable state. An object of the present invention is to provide a roller bearing cage that can be easily manufactured at low cost and a method for manufacturing the same.

  In order to achieve the above object, the first aspect of the present invention is an annular roller bearing which is arranged between an inner ring and an outer ring of a bearing, and in which a plurality of pocket holes for accommodating rollers are formed at intervals in the circumferential direction. A retainer for a roller, wherein a peripheral bulging portion protruding in the outer diameter direction is provided on the entire circumference of the pocket hole, and the roller is guided and held by the peripheral bulging portion. It is a summary.

  In the roller bearing retainer according to the first aspect of the present invention, since the peripheral bulge is formed on the entire circumference of the pocket hole, the entire circumference of the pocket hole, in particular, the corner portion is reinforced, and the fatigue fracture resistance is improved. Can be improved. For this reason, for example, in a bearing in which this cage is incorporated, even if tensile force and compressive force are repeatedly generated in the pocket hole corner of the cage due to stress due to vibration load during operation rotation, the corner is cracked. Can be prevented, damage to the cage itself can be prevented, and fatigue life strength can be improved.

  In addition, since the cage of the present invention reinforces the pocket hole corner by forming a peripheral bulge portion, even if the plate thickness of the material forming the cage is made thin, Sufficient fatigue fracture resistance can be ensured. Therefore, it is possible to reduce the thickness of the material in the cage, and accordingly, it is possible to reduce the weight of the entire cage. For this reason, the rotational torque in the bearing assembly state can be reduced, and good rotational characteristics can be obtained, and the impact load can be reduced by reducing the inertial force due to weight reduction. Furthermore, since a material having a thin plate thickness is used, processing can be easily performed with high accuracy, production efficiency can be improved, and cost can be further reduced including reduction of material cost.

  Further, in the present invention, since it is not necessary to perform hardening treatment such as quenching on the cage, it is possible to prevent cracks and cracks from occurring when the rollers are fitted and caulked. In addition, since adverse effects due to heat during quenching can be prevented, a reduction in dimensional accuracy such as roundness can be prevented.

  Furthermore, since the height of the peripheral bulge portion can be increased as required, for example, a sufficiently large roller guide support surface constituted by both side surfaces of the peripheral bulge portion inner peripheral surface can be ensured in a stable state. The roller can be held, the rotation characteristics can be improved, and the roller contact surface constituted by the upper end surface of the inner peripheral surface of the peripheral edge can be secured sufficiently large to prevent the load from being concentrated during contact rotation of the roller. Abrasion resistance can be improved.

  Further, since the cage of the present invention does not form the guide holding portion by coining as in the prior art, it is possible to effectively prevent defects due to coining, for example, reduction in dimensional accuracy due to movement of meat. it can.

  In this 1st invention, it is good to employ | adopt the structure by which the said peripheral bulging part is formed by the edge bending part provided in the peripheral part of the said pocket hole.

  That is, when this configuration is adopted, the peripheral bulge portion can be easily and accurately formed by pressing such as burring, which can improve the production efficiency and further improve the dimensional accuracy. be able to.

  In addition, since the cage of the first invention has the above-described excellent characteristics, it can be suitably used for tapered roller bearings for railway vehicles and the like that are particularly required to have high speed and durability. .

  That is, the present invention is a roller bearing cage according to claim 1 or 2, wherein one end side in the axial direction is formed as a tapered roller bearing cage having a larger diameter than the other end side. It is desirable to adopt.

  On the other hand, this 2nd invention specifies the manufacturing process for manufacturing the cage for roller bearings of the said 1st invention.

  In other words, the second invention is a method of manufacturing a roller bearing retainer for holding a plurality of rollers at intervals in the circumferential direction between the inner ring and the outer ring of the bearing. A pocket for accommodating a roller by preparing an annular cage intermediate product in which a lower hole is formed, burring the peripheral hole of the cage intermediate product so that a peripheral edge thereof is pushed outward. A hole is formed, and a peripheral bulge protruding in the outer diameter direction is formed on the entire circumference of the hole.

  In the manufacturing method of the second invention, the roller bearing retainer of the first invention having the above-described effects can be reliably formed.

  In this 2nd invention, it is preferable to employ | adopt the structure formed from a steel plate as a raw material of the said cage for roller bearings.

  That is, when this configuration is adopted, the retainer can be efficiently manufactured using press working.

  As described above, according to the present invention, it is possible to prevent deterioration in dimensional accuracy and the like, obtain high quality, improve fatigue life, and maintain rollers in a stable state at low cost. There is an effect that it can be easily manufactured.

  1 to 4 are views showing a tapered roller bearing retainer (10) according to an embodiment of the present invention. As shown in these drawings, the cage (10) includes an annular portion (11) (12) provided on one end side (upper end side) and the other end side (lower end side) in the axial direction, A press-formed product made of a steel plate integrally connecting a plurality of column portions (15) that connect the annular portions (11) and (12) and are arranged in parallel at predetermined intervals along the circumferential direction. It is configured. The upper ring part (11) and the lower ring part (12) are arranged on the same axis, and the upper ring part (11) has a diameter dimension relative to the lower ring part (12). Largely formed. Further, the cage (10) has a plurality of rectangular pocket holes (16) surrounded by adjacent column parts (15) and upper and lower circular parts (11), (12) at predetermined intervals in the circumferential direction. Is provided.

  An annular peripheral bulging portion (17) protruding in the outer diameter direction is formed on the entire circumference of the pocket hole (16) of the cage (10).

  In order to manufacture this cage (10), first, a blank product is obtained by punching a steel plate material, and the blank product is drawn to obtain a substantially cylindrical drawn product having a taper on the peripheral wall.

  Subsequently, a pocket hole forming portion in the peripheral wall of the drawn product is punched from the inner diameter side toward the outer diameter side to form a rectangular shaped lower hole that is slightly smaller than the pocket hole (16).

  Next, a punch for burring is driven from the inner diameter side to the outer diameter side with respect to the lower hole of the drawn product, and the lower hole is widened to form a pocket hole (16) of a predetermined size, and at the same time, the peripheral edge of the lower hole is outside. To form an annular peripheral bulging portion (17) around the entire circumference of the pocket hole (16).

  Thereafter, the lower wall of the drawn product is punched out to form the lower end annular portion (12) and the upper end edge portion is cut to form the upper end annular portion (11), as in the prior art. Is.

  The cage (10) of this embodiment manufactured in this way is assembled to the bearing in the same manner as in the conventional case. That is, the cage (10) is fitted into the inner ring, and the rollers (20) are stored in the pocket holes (16), and then the column portion (15) of the cage (10) is crimped to retain the cage (10). Then, the roller (20) is prevented from being removed, and in this state, the roller (20) is assembled so as to be fitted into the outer ring.

  According to the cage (10) of the present embodiment, the peripheral bulge portion (17) is formed on the entire periphery of the pocket hole (16), and therefore the peripheral portion of the pocket hole (16), particularly the corner portion. The fatigue fracture resistance of (16a) can be improved. For this reason, for example, in a bearing in which the cage (10) is incorporated, tensile force and compression are applied to the corner (16a) of the pocket hole (16) in the cage (10) due to stress caused by vibration load during operation rotation. Even if force repeatedly occurs, cracks can be prevented from occurring in the corner (16a), damage to the cage itself can be prevented, and fatigue life strength can be improved.

  Further, the cage (10) of the present embodiment forms a peripheral bulge portion (17) around the entire circumference of the pocket hole (16), and fatigue fracture resistance of the corner portion (16a) of the pocket hole (16). Therefore, even if it is intended to reduce the thickness of the material forming the cage (10), sufficient fatigue fracture resistance can be ensured at the pocket hole corner (16a). For this reason, the thickness of the material can be reduced, and the weight of the entire cage can be reduced accordingly. In addition, the weight reduction can reduce the rotational torque in the assembled state of the bearing, and it can obtain good rotation characteristics, and the impact load can be reduced by reducing the inertia force due to the weight reduction. It can also be suitably used for applications that greatly increase. Further, since a material having a thin plate thickness is used, the material cost is reduced, the press work can be easily performed with high accuracy, the production efficiency can be improved, and the cost can be further reduced.

  Here, as shown in FIG. 4, the relationship between the thickness of the present embodiment and the conventional one will be described in detail. In this embodiment, the large diameter dimension of the tapered roller (20) is “R”, When the plate | board thickness which comprises a container (10) is set to "T", it is set to T = 0.08R-0.15R, Preferably it is set to 0.10R-0.13R. On the other hand, for reference, the conventional tapered roller bearing retainer is generally set to T = 0.16 to 0.25R. Thus, it is clear that the cage of the present embodiment is thinner than the conventional one.

  The cage of the present embodiment uses a steel plate such as a cold-rolled steel plate (SPCC) or a hot-rolled steel plate (SPHC) as a material, and there is no need to use a high-strength material such as a high-carbon steel plate. For this reason, reduction of material cost and improvement of workability can be achieved more reliably.

  In the present embodiment, the retainer (10) is not subjected to hardening treatment such as quenching. Therefore, when the column (15) is crimped to hold the roller (20) during the assembly of the bearing. In addition to preventing cracks and cracks in the column part (15), and further preventing adverse effects due to heat during quenching, it is possible to prevent deterioration in dimensional accuracy such as roundness, and high quality. A cage product can be obtained.

  Moreover, in the present embodiment, it is not necessary to increase the radius of curvature of the corner portion (16a) in the pocket hole (16), so that an effective contact area of the tapered roller (20) with respect to the cage (10) is sufficiently ensured. Thus, the durability life can be further improved, the rotational characteristics can be improved, and higher quality can be obtained.

  Further, in the present embodiment, the peripheral edge of the pocket hole (16) is bent to form the peripheral bulge (17), and both side portions on the inner peripheral surface of the peripheral bulge (17) are tapered rollers. Since it is configured as the guide part of (20), the length of the guide part, that is, the height (H) of the bulging part (17) can be sufficiently secured, and the roller (20) is brought into a stable state. Can be held.

  Here, in the conventional cage as shown in FIG. 7, the inner surface of the pocket hole, that is, both side surfaces of the column portion, are chamfered by coining on the inner side in the plate thickness direction to form a chamfered portion. However, due to the movement of meat by coining, the periphery of the pocket hole, such as the pillar, is deformed, and the pocket length and pocket width change, and there is a concern that the dimensional accuracy may be reduced. It was a place.

  On the other hand, in the present embodiment, the guide portion is formed by edge bending without performing coining processing, so there is no movement of the meat, deformation of the pocket hole peripheral portion can be prevented, and high dimensional accuracy. Can be maintained. Furthermore, the size of the pocket hole can be managed by edge bending with a burring punch, and the dimensional accuracy can be stabilized and quality can be further improved compared to the case where it is managed by plastic processing by coining as in the past. Can be improved.

  In this embodiment, the upper end surface (large diameter side end surface) of the tapered roller (20) is in contact with the upper end surface (large diameter side end surface) of the pocket hole (16) in the bearing assembly state. Since this contact portion is formed by the peripheral bulging portion (17) by burring, it is possible to secure a large contact area with the roller (20) and to reduce the surface pressure. The fatigue life strength can also be improved in this respect.

  Furthermore, the size of the roller guide support surface and the roller contact surface on the inner peripheral surface of the peripheral bulge portion (17) can be freely adjusted, the degree of design freedom is increased, and excellent versatility can be obtained. .

  Here, as shown in FIG. 3, in this embodiment, when the plate thickness of the cage (10) is “T” and the height of the peripheral bulge portion (17) is “H”, H = 0.7T It is good to set to -1.5T, Preferably it is good to set to H = 0.9T-1.3T. That is, when the height (H) of the peripheral bulge portion (17) is too small, the flat length on the inner peripheral surface of the pocket hole, that is, the internal peripheral surface of the peripheral bulge portion (17) becomes short, and the tapered roller There is a possibility that a sufficient length cannot be secured as the guide portion of (20). Conversely, if the height (H) of the peripheral bulge portion (17) is too large, the bending length by burring increases, the diameter expansion rate for the pilot hole increases, and cracks occur during burring. There is a fear.

  As shown in FIG. 4, in the present embodiment, the contact position of the peripheral bulge portion (17) with the upper end surface of the roller (20) is arranged outside the axis (S) of the roller (20). Therefore, the bending angle (θ) of the peripheral bulge portion (17) can be suppressed to 90 ° or less during burring to form the peripheral bulge portion (17), and bending molding is performed. Can be easily performed.

  Furthermore, the manufacturing method of the cage in the present embodiment uses a burring process instead of a coining process even when compared with a conventional manufacturing process, and thus maintains a high productivity without increasing the number of pressing steps. can do.

  In the above embodiment, the case where the present invention is applied to a tapered roller bearing retainer has been described as an example. However, the present invention is not limited thereto, and a cylindrical roller bearing retainer, a spherical roller bearing retainer, etc. The present invention can also be applied to other roller bearing cages.

<Example>
In accordance with the manufacturing method of the above embodiment, a tapered roller bearing cage (10) having an outer diameter of 194 mm, a height of 66 mm, and a plate thickness of 2.6 mm was produced. At this time, as shown in the above embodiment, burring was performed to form a peripheral bulge portion (17) having a height of 2.8 mm on the entire circumference of each pocket hole (16).

<Comparative Example 1>
A tapered roller bearing retainer was produced in the same manner as in the above example except that a chamfered portion was formed by coining at the peripheral portion of the pocket hole and no peripheral bulge portion was formed.

<Comparative example 2>
A tapered roller bearing retainer was produced in the same manner as in Comparative Example 1 except that the plate thickness was adjusted to 5.5 mm.

<Durability fatigue test by drop impact>
Double row tapered roller bearings (P1) having an outer diameter of 220 mm, an inner diameter of 120 mm, a height of 155 mm, and a weight of about 25 kg were respectively assembled using the cages of the above-mentioned examples and comparative examples.

  Further, each of the bearings was subjected to a drop test using the apparatus shown in FIG. In this apparatus, a lifting / lowering body (61) for workpiece installation is provided on a base (60) through a guide column (62) so that the lifting / lowering body (61) can be moved by a driving means (not shown). After raising to a predetermined height, the elevating body (61) can be dropped and collided with the base (60) by its own weight.

  Then, the bearing (P1) is fixed to the lifting body (61) of this apparatus in a state where the shaft core is disposed in parallel with the horizontal direction, and the lifting body (61) is cycled 55 times per minute at a fall distance of 80 mm. The bearing (P1) was repeatedly dropped on the base (60), and the relationship between the number of drops and the presence or absence of cracking in each bearing was measured and observed.

  As a result, the bearing of Comparative Example 1 was cracked when the number of drops was 20,000 times, and that of Comparative Example 2 was cracked at 500,000 times. In addition, all of the cracks occurred at the corners in the pocket holes of the cage.

  On the other hand, the bearings of the examples were not cracked even when the number of drops reached 700,000 times, and the test was terminated at 700,000 times.

  From the above results, the bearing cage of the example related to the present invention is superior in durability (fatigue fracture resistance) to the drop impact and the fatigue life compared to the bearing cage of the comparative example related to the conventional product. The strength could be improved.

<FEM analysis>
The roller bearings assembled with the cages of Examples and Comparative Example 2 were dropped and collided in the same manner as described above, and the maximum stress generated around the pocket hole at the time of the impact was determined by FEM analysis (finite element method analysis). As a result, the stress distribution state as shown in FIG. 6 was recognized in the example, and the stress distribution state as shown in FIG. 7 was recognized in the comparative example. In these stress distribution diagrams, a dot pattern is given to the stress generation region, and the point density is expressed as the region where the generated stress is strong. For reference, each part of the example of FIG. 6 is given a symbol corresponding to the above-described embodiment (see FIG. 1 and the like), and each part of Comparative Example 2 of FIG. The code | symbol corresponding to 9 grade | etc.) Is provided.

  Table 1 below shows the stress (maximum stress) between the large-diameter side corner (Lr) and the small-diameter side corner (Sr) of the pocket hole in the cages of Examples and Comparative Example 2.

  As can be seen from FIGS. 6 and 7 and Table 1, in the embodiment, the impact force applied to the cage can be reduced by reducing the inertial force due to weight reduction, and the peripheral bulge portion can be sufficiently formed by burring. Since sufficient rigidity can be ensured, the stress generated at the corners of the pocket holes is smaller than that of Comparative Example 2, and excellent fatigue fracture resistance and fatigue life strength can be obtained.

It is a perspective view which shows the retainer for tapered roller bearings which is embodiment of this invention. It is a perspective view which expands and shows the pocket hole periphery in the holder | retainer of embodiment. It is side surface sectional drawing which shows the one-side half part in the holder | retainer of embodiment. It is a horizontal sectional view showing the pocket hole periphery in the cage of an embodiment. It is a front view which shows typically the drop impact test apparatus with which the holder | retainer of the Example was installed. It is a stress distribution map by the FEM analysis in the holder | retainer of an Example. 6 is a stress distribution diagram by FEM analysis in a cage of Comparative Example 2. FIG. It is sectional drawing which shows the one side part of the conventional tapered roller bearing. It is a perspective view which shows the conventional retainer for tapered roller bearings.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Cage 16 ... Pocket hole 17 ... Periphery bulging part 20 ... Roller

Claims (5)

An annular roller bearing retainer that is arranged between the inner ring and the outer ring of the bearing, and in which a plurality of pocket holes for accommodating the rollers are formed at intervals in the circumferential direction,
A roller bearing holder, characterized in that a peripheral bulge portion protruding in the outer diameter direction is provided on the entire circumference of the pocket hole, and the roller is guided and held by the peripheral bulge portion. vessel.   The roller bearing retainer according to claim 1, wherein the peripheral bulge portion is formed by an edge bent portion provided at a peripheral portion of the pocket hole. A roller bearing retainer according to claim 1 or 2,
A roller bearing cage in which one end side in the axial direction is formed as a tapered roller bearing cage having a larger diameter than the other end side. A method of manufacturing a roller bearing retainer for holding a plurality of rollers at intervals in the circumferential direction between an inner ring and an outer ring of a bearing,
Prepare an annular retainer intermediate product in which a plurality of pilot holes are formed at intervals in the circumferential direction,
The lower hole in the intermediate product of the cage is subjected to burring so as to push and bend the peripheral edge outward to form a pocket hole for accommodating the roller, and the peripheral bulge protruding in the outer diameter direction around the entire hole. A method for manufacturing a roller bearing retainer, wherein a protruding portion is formed.   The roller bearing retainer according to claim 4, wherein a steel plate is used as a material for the roller bearing retainer.

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