JP2003247552A - Manufacturing method of crown retainer for rolling ball bearing, die used for manufacturing crown retainer for rolling ball bearing, crown retainer for rolling ball bearing, and rolling ball bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the lubricant reserving property in a crown retainer, and eliminate lubrication shortage. <P>SOLUTION: A plurality of uniform indentations are machined in desired parts of a die by rolling, laser machining and turning. A lubricant reserving part 8 made up by the uniform indentations is formed on the pocket surface 5b of the crown type retainer 4 molded by using the die. By so doing, the lubricant reserving property is improved. The lubricant reserving part 8 can be also formed of a plurality of uniform grooves. In addition to the pocket surface 5b, the lubricant reserving part 8 can be also formed on the guide surface 6 of the retainer. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crown type cage for rolling ball bearings for rotating and supporting a rotary shaft of a rotary machine such as a motor in which grease is sealed inside the bearing.

[0002]

2. Description of the Related Art Rolling bearings, particularly ball bearings, are often used for rotating and supporting a rotating shaft of a rotating machine such as a motor. Also, the cage used for these ball bearings,
A plastic-made cage made by injection molding a synthetic resin using a mold is used. Balls in these cages and the pocket surface that holds the balls, outer cage inner surface in the case of outer ring guide type cage, outer circumferential surface of the cage guide part that slides in contact with inner diameter surface of the outer ring, inner ring outer diameter surface in the case of inner ring guide cage The inner circumferential surface of the cage guide portion that is in sliding contact with the cage is relatively moving in a sliding state, not in a rolling state between the balls and the raceway grooves.

[0003]

Generally, the pocket of the crown cage has a spherical shape having a curvature slightly larger than that of the ball. When such a cage is used, the grease attached to the balls is easily scraped off at the pocket edge, and in the specifications where the amount of grease is reduced for the purpose of low bearing torque, the balls and raceway grooves are insufficiently lubricated. May fall into. In this case, direct contact between the ball and pocket causes heat generation, the cage causes self-excited vibration to generate cage noise, and the amount of lubrication between the raceway surface and the ball decreases and the ball and raceway surface wear. Vibration and noise may be generated, which may lead to obstacles such as shortening the life of the equipment. Also, regarding the inner ring guide type or the outer ring guide type cage, in the case of grease lubrication, especially the sliding contact surface is apt to fall into insufficient lubrication, heat generation due to contact, abnormal noise, abnormal vibration,
Alternatively, the guide portion of the cage may be worn and impair normal rotation.

As a solution to these problems, for example, in Japanese Unexamined Patent Publication No. 9-317774, there is a method in which a sliding contact surface of a synthetic resin cage is shot-blasted to form a concave reservoir of lubricating oil. The shot blasting process can easily form the required unevenness at low cost by using the shape, size, injection pressure, and injection time of the medium to be ejected as parameters. Also, the shot blasting process is applied to the mold to roughen the surface of the mold to form unevenness, and the method of transferring from the mold to the product, or the electric discharge machining of the mold, the same unevenness is obtained. It is also being formed. However, the formed irregularities are not uniform and are randomly distributed, and the depths of the recesses that serve as oil reservoirs and the opening diameter are also non-uniform. In such a case, especially in the pocket for holding the balls, the oil collecting effect tends to be uneven between the pockets, and the oil collecting effect of a part of the guide surface of the inner ring guide type or the outer ring guide type cage is not uniform. It may be sufficient.

The present invention has been made in view of the above problems of the prior art, and its object is to:
The purpose of this is to improve the effect of retaining the lubricant in the crown type cage and eliminate the lack of lubrication.

[0006]

To achieve the above object, the technical means of the present invention is a method for manufacturing a crown retainer for ball bearings, which is made of a synthetic resin and is molded. Structure,
By laser processing or turning, a large number of uniform concavities and convexities or grooves are machined at desired locations on the die, and molten resin is injected into the cavity of the machined die to produce a large number of even areas at desired locations. This is to form the lubricant reservoir formed of such irregularities or grooves by transfer.

The mold used in the above-mentioned manufacturing method is formed by rolling,
That is, a large number of uniform irregularities or grooves are formed at desired locations by laser processing or turning.

In a synthetic resin crown-shaped cage to be molded by a die, a cage in which a large number of uniform irregularities or grooves are formed at a desired location by rolling, laser processing, or turning In addition, a crown type cage for a rolling ball bearing is formed by transferring a lubricant reservoir formed of a large number of uniform irregularities or a plurality of grooves during injection molding.

In the above cage, a large number of uniform irregularities or a lubricant reservoir consisting of a plurality of grooves are transferred to the surface of each cage pocket that is in sliding contact with the rolling elements.

In the outer ring guide cage, a large number of uniform irregularities or a lubricant reservoir formed of a plurality of grooves are transferred over the entire area of the outer circumferential surface of the cage that is in sliding contact with the inner surface of the outer ring.

In the inner ring guide cage, a large number of uniform irregularities or a lubricant reservoir formed of a plurality of grooves are transferred over the entire area of the inner circumferential surface of the cage which is in sliding contact with the outer surface of the inner ring. is there.

The lubricant reservoirs composed of a large number of uniform irregularities or a plurality of grooves are arranged according to the regularity.
Alternatively, the projections or holes are irregularly arranged, or a plurality of non-intersecting grooves or a plurality of intersecting grooves.

A rolling ball bearing comprising at least a pair of bearing rings, a large number of balls incorporated between the bearing rings, and a crown-shaped cage for guiding and holding the balls, the crown-shaped cage comprising: By rolling, laser processing, or turning, a mold in which a large number of uniform irregularities or grooves are processed at the desired location is injection-molded at the desired location of the cage. This is a rolling ball bearing that is sometimes transferred.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

The figure shows an outer ring 1, an inner ring 2, a plurality of balls (rolling elements) 3 incorporated between the outer ring 1 and the inner ring 2, and a crown-shaped holding for guiding the plurality of balls 3 equally. 1 shows an embodiment of a rolling ball bearing including a container 4 and a sealing plate (seal or shield) 18 and having a lubricant (grease or the like) filled in the bearing. The outer ring 1, the inner ring 2, the balls (rolling elements) 3, and the sealing plate (seal or shield) 18 should not be construed as being limited to the illustrated configuration, but may be arbitrarily changed within the scope of the present invention. The design can be changed.

The crown-shaped cage 4 is provided with a plurality of pockets 5 at equal intervals in the circumferential direction of the annular body 4a so that a plurality of balls can be equally distributed and guided (see FIG. 2). Further, in this type of crown-shaped cage 4, a guide surface 6 that is in sliding contact with the inner ring outer diameter surface 2a
Of the type (inner ring guide type retainer) protruding from the inner peripheral surface 4c of the cage, and the guide surface 7 slidingly contacting the inner surface 1a of the outer ring,
There is also a type (outer ring guide type retainer) protrudingly provided on the outer peripheral surface 4b of the retainer. For example, FIGS. 5 and 6 (a) show an embodiment of the inner ring guide type, and FIG. 6 (b) shows an embodiment of the outer ring guide type. The illustrated example is merely one embodiment, and the protruding lengths of the guide surfaces 6 and 7 are arbitrary.
These guide surfaces 6 and 7 may be provided over the entire circumference in the circumferential direction of the cage or may be formed partially. The annular diameter and material of the entire cage, or the pocket diameter and the number of pockets are not particularly limited and the design can be arbitrarily changed within the scope of the present invention.

The pocket 5 has an opening 5a directed in the axial direction, and the diameter of the pocket 5 is slightly larger than the diameter of the ball 3. The pocket surface 5b may be of any type such as a cylindrical type in the radial direction of the cage 4 or a spherical type.

A desired lubricant reservoir 8 is provided on either one of the pocket surface 5b and the guide surface 6 or 7, or both of the pocket surface 5b and the guide surface 6 or 7. The lubricant reservoir 8 is, for example, uniformly provided on each pocket surface 5b, and is uniformly provided over the entire circumferential direction of the guide surfaces 6 and 7. This is to make the oil sump effect uniform in each part.

The lubricant reservoir 8 is composed of a large number of irregularities or one or a plurality of grooves 8a, and these irregularities or grooves 8a are formed uniformly. Also,
It is also within the scope of the present invention to include a combination of unevenness and grooves. For example, the unevenness 8a is composed of a large number of uniformly formed projections or holes of a desired shape, and the groove 8a is a single groove or a plurality of uniform grooves that do not intersect or a plurality of uniform grooves that intersect. It is composed of grooves.

The irregularities or grooves 8a forming the lubricant reservoir 8 may be arranged according to regularity or may be arranged irregularly. The irregularities or grooves 8a may have any shape and number of protrusions and holes, and may have any groove length, depth and shape (straight line, wavy line, etc.). Further, when the lubricant reservoir 8 is composed of a plurality of grooves 8a, the grooves 8a may be equally spaced or unequal. Further, the intersecting state of the grooves 8a may be either orthogonal or non-orthogonal.

That is, the lubricant reservoir 8 is provided in the pocket 5
As long as it has a uniform structure capable of holding a lubricant (grease or the like) inside or on the guide surface 6 or 7, it is not particularly limited to the structure.

Next, a method of manufacturing the above-mentioned crown-shaped cage and an embodiment of a mold used in the method will be described.

In the manufacturing method of the present invention, a molten resin is formed by injection molding using a mold shown below. Mold 9 (9a,
9b) has an outer shape generally used for injection molding of this type of cage 4, and a spherical mold (also referred to as a cage pocket forming mold) 9a for forming the cage pocket 5 has an outer peripheral surface thereof. Or other mold 9b has a large number of concaves and convexes or one or a plurality of grooves 10 formed in the guide surface forming portion of the outer peripheral surface or the inner peripheral surface of the cage. These molds 9
The irregularities or grooves 10 provided on a and 9b are configured uniformly.

Thus, the unevenness or groove 10 is formed in the mold 9
By uniformly providing the desired portions of (9a, 9b),
At the time of injection molding, each pocket surface 5b of the cage 4 or the guide surface 6 or 7 has a lubricant reservoir portion 8 which is formed with uniform irregularities or grooves 8a corresponding to the irregularities or grooves 10 of the mold 9 (9a, 9b). Is formed by transfer. Therefore, the cage 4
The above-mentioned unevenness or groove 8a forming the lubricant reservoir 8 formed on the pocket surface 5b and the guide surface 6 or 7 of
The structure is the same as that of the unevenness or the groove 10 provided on the mold 9 (9a, 9b).

Therefore, by injecting the molten resin into the cavity of the mold 9 formed by combining the thus-formed cage pocket forming mold 9a and the other mold 9b, the mold 9 is formed. (9a, 9b) unevenness or a uniform reservoir corresponding to the groove 10 or a lubricant reservoir 8 comprising a groove 8a is formed by transfer formation on either or both of the pocket surface 5b and the guide surface 6 or 7. Shape retainer 4
Can be injection molded.

Here, a specific manufacturing method will be described. "First embodiment" Fig. 3 shows a first embodiment. In the present embodiment, in order to form the lubricant reservoir 8 having the uniform unevenness or the groove 8a on each pocket surface 5b of the cage 4, the mold 9a corresponding to the cage pocket 5 has a desired shape of the unevenness or the groove. Form 10. In this embodiment, a desired unevenness or groove 11a is provided on a desired machining tool 11,
While pressing the mold 9a for pocket formation against the irregularities or grooves 11a of the processing tool 11, the mold 9a and the processing tool 11 are moved relative to each other (FIG. 3A), and the surface of the mold 9a is plastically deformed. By doing so, the unevenness or the groove 10 is formed on the surface of the mold 9a (FIG. 3B). Although one mold is processed in the figure, it is also possible to process a plurality of molds at the same time.

The unevenness of the working tool 11 or the shape of the groove 11a is arbitrary depending on the form formed in the cage pocket 5, and within the scope of the present invention, there are one or a plurality of non-intersecting grooves or intersecting grooves. There are protrusions or holes arranged or irregularly arranged according to a certain regularity. In this embodiment, a plurality of grooves 11a that are arranged at regular intervals and do not intersect are used.

Therefore, according to this embodiment, the machining tool 1
By a plurality of non-intersecting grooves 11a arranged at regular intervals (FIG. 3A), a plurality of non-intersecting grooves arranged at regular intervals corresponding to the plural non-intersecting grooves 11a arranged at regular intervals. A groove 10 of a book is formed on the surface of the die 9a by plastic deformation (FIG. 3B), and the die 9 having the groove 10 is formed.
The cage 4 is injection-molded using a (FIG. 3 (c)), so that the lubricant reservoir portion is composed of a plurality of non-intersecting grooves 8a arranged at regular intervals corresponding to the grooves 10 of the mold 9a. 8
It is formed on the cage pocket surface 5b (FIGS. 3D and 4). Further, the speed of relative movement between the processing tool 11 and the mold 9a, the pressing force, the cutting oil used during processing, and the like are arbitrary, and the design can be changed within the scope of the present invention.

In the figure, the mold 9a is shown to be in relative motion.
When it is desired to form the unevenness or the groove 10 only on an arbitrary portion of the above, it is possible to form only by pressing. Mold 9a
By controlling the relative movement between the machining tool 11 and the machining tool 11, machining can be performed on the entire circumference of the mold 9a or only on an arbitrary part.

[Second Embodiment] FIG. 7 shows a second embodiment. In the present embodiment, in order to form the lubricant reservoir 8 composed of the uniform unevenness or groove 8a on each pocket surface 5b of the cage 4, the unevenness or groove 10 is formed on the die 9a corresponding to the cage pocket 5. To do.

In this embodiment, two processing tools 12, 1 are used.
3 are provided with desired unevenness or grooves 12a and 13a,
While pressing the mold 9a corresponding to the cage pocket 5 between the two machining tools 12 and 13, the mold 9a and the machining tools 12 and 13 are relatively moved (FIG. 7 (a)). 9
The surface of a is plastically deformed to form irregularities or grooves 10 (FIG. 7B).

In this case, the unevenness or grooves 12a, 13a of the upper working tool 12 and the lower working tool 13 have the same shape, but if the respective shapes are different, the die 9
A can be provided with a complex unevenness or groove shape, and the desired unevenness or groove shape can be easily obtained by combining the processing tools 12, 13. In this embodiment, a plurality of intersecting grooves 12a and 13a arranged at regular intervals are adopted on the surfaces of the processing tools 12 and 13 (Fig. 7 (a)).

Therefore, according to this embodiment, the machining tool 1
By the plurality of intersecting grooves 12a, 13a arranged at a constant interval provided in Nos. 2 and 13, the plurality of intersecting grooves 10 arranged at a constant interval corresponding to the grooves 12a, 13a,
It is formed on the surface of the mold 9a by plastic deformation (see FIG. 7).
(B)) By injection-molding the retainer 4 using the mold 9a having the grooves 10, a constant interval corresponding to a plurality of intersecting grooves 10 of the mold 9a is provided. Lubricant reservoir 8 consisting of a plurality of intersecting grooves 8a
Are formed on the cage pocket surface 5b (see FIG. 7).
(C)). It is also possible to employ a plurality of irregularities or grooves that do not intersect as in the first embodiment, or projections or holes that are arranged according to a certain regularity or are arranged irregularly. The other configuration / effects are the same as those in the first embodiment.

[Third Embodiment] FIG. 8 shows a third embodiment. In the present embodiment, in order to form the lubricant reservoir 8 composed of the uniform unevenness or the groove 8a on the pocket surface 5b of the cage 4, the mold 9a corresponding to the cage pocket 5 is provided with the unevenness or the groove 10. .

The present embodiment is an embodiment for forming the unevenness or the groove 10 mainly on the top portion 9a 'of the mold 9a corresponding to the cage pocket 5 (corresponding to the pocket bottom portion 5c in the cage 4). By providing irregularities or grooves 14a on the surface of the working tool 14 and moving the mold 9a relative to the working tool 14 as shown (FIG. 8A), the mold 9
The surface of a is plastically deformed to form irregularities or grooves 10 (FIG. 8B). In this embodiment, the unevenness or the groove 1
As 4a, a plurality of protrusions arranged on the surface of the working tool 14 according to a certain rule are adopted.

Therefore, by the plurality of projections (unevenness or groove) 14a arranged on the above-mentioned machining tool 14 according to a certain rule, according to a certain rule corresponding to the plurality of projections (unevenness or groove) 14a. A plurality of irregularities 10 to be arranged are formed on the surface of the die 9a by plastic deformation (FIG. 8B), and the cage 4 is injection-molded using the die 9a having the irregularities 10. Then, the lubricant reservoir 8 composed of the concavities and convexities 8a arranged according to a certain rule corresponding to the concavities and convexities 10 described above has the cage pocket surface 5
It is formed in b (FIG.8 (c)). The other configuration / effects are the same as those in the first embodiment.

[Fourth Embodiment] FIG. 9 shows a fourth embodiment. In the present embodiment, in order to form the lubricant reservoir 8 composed of the uniform unevenness or the groove 8a on the pocket surface 5b of the cage 4, the mold 9a corresponding to the cage pocket 5 is provided with the unevenness or the groove 10. .

In this embodiment, the machining tool 15 is provided with desired irregularities or grooves 15a, and the cage pocket 5 for rotation is rotated.
The surface of the mold 9a is plastically deformed by pressing the processing tool 15 against the mold 9a corresponding to the concave / convex or groove 1
0 is formed in the mold 9a. As shown, the processing tool 15
By swinging, the unevenness or the groove 10 can be formed on the entire mold 9a.

In the present embodiment, on the surface of the processing tool 15,
A plurality of non-intersecting grooves 15a arranged at regular intervals are adopted. Therefore, according to the present embodiment, the processing tool 15
By the plurality of non-intersecting grooves 15a arranged at constant intervals, the plural non-intersecting grooves 10 corresponding to the grooves 15a are formed on the surface of the die 9a by plastic deformation. By injection-molding the cage 4 using the mold 9a having 10 pieces, a plurality of non-intersecting grooves arranged at regular intervals corresponding to the plurality of non-intersecting grooves 10 arranged in the die 9a. The lubricant reservoir 8 including the groove 8a is formed on the cage pocket surface 5b. The other configuration / effects are the same as those in the first embodiment.

[Fifth Embodiment] FIG. 10 shows a fifth embodiment. In the present embodiment, in order to form the lubricant reservoir 8 composed of the uniform unevenness or the groove 8a on the pocket surface 5b of the cage 4, the mold 9a corresponding to the cage pocket 5 is provided with the unevenness or the groove 10. .

In this embodiment, a laser processing machine (processing tool) 16 is used to provide the required unevenness or groove 10 on the mold 9a corresponding to the cage pocket 5. By controlling the laser processing machine 16, it is possible to manufacture the mold 9a with high processing accuracy. Therefore, according to the present embodiment, the mold 9
Laser processing the desired unevenness or groove 10 on the surface of a,
By injection-molding the cage 4 using the mold 9a having the irregularities or the grooves 10, the lubricant reservoir 8 composed of the irregularities or the grooves 8a corresponding to the irregularities or the grooves 10 of the mold 9a forms a cage pocket. It is formed on the surface 5b. The other configuration / effects are the same as those in the first embodiment. Also,
This embodiment is the same for the turning machine. Other configurations
The function and effect are the same as those in the first embodiment.

[Sixth Embodiment] FIG. 11 shows a sixth embodiment. In the present embodiment, in order to form the lubricant reservoir 8 on the guide surface 6 of the bearing ring guide type retainer, the unevenness or the groove 10 is formed on the portion 9b 'of the mold 9b corresponding to the guide surface 6. In this embodiment, a plurality of intersecting grooves 17a arranged at regular intervals are adopted on the surface of the working tool 17 (Fig. 11 (a)).

Therefore, according to this embodiment, the machining tool 17 is attached to the portion 9b 'corresponding to the cage guide surface 6 of the die 9b.
By pressing and swinging (FIG. 11 (a)), a plurality of intersecting grooves 10 arranged at regular intervals are formed on the surface of the guide surface 9b 'of the die 9b by plastic deformation (FIG. 11 (a)). 1
1 (b)), the retainer 4 is injection-molded using the mold 9b having the grooves 10 so that the fixed intervals corresponding to the plurality of intersecting grooves 10 arranged at constant intervals of the mold 9a. Lubricant reservoir 8 consisting of a plurality of intersecting grooves 8a
Are formed on the cage guide surface 6 (FIG. 11C). Incidentally, FIG. 11B shows a portion 9b 'corresponding to the guide surface of the mold 9b.
FIG. 11C is an enlarged schematic view in which the groove 10 is provided on the guide surface 6. The part surrounded by the broken line circle in FIG. 11C is formed by forming the lubricant reservoir 8 including the groove 8a on the guide surface 6 as viewed from the direction C in the drawing. An enlarged schematic diagram is shown.

The guide surface 6 is effective both when it is formed over the entire circumference of the cage 4 and when it is partially formed. Depending on the mold shape, the machining tool 17, the tool 17 and the mold 9b are effective. This can be dealt with by controlling the relative movement of the.

In the present embodiment, the guide surface 6 provided on the inner peripheral surface of the cage 4 is provided with the lubricant reservoir portion 8. However, the lubricant surface is provided on the guide surface 7 provided on the outer peripheral surface of the cage. The same applies to the configuration in which the portion 8 is provided.

In this embodiment, the processing tool 17 is used, but as in the fifth embodiment, it is also possible to form irregularities on the die 9b by the laser processing machine 16 or the turning machine, and the scope of the present invention. It is within.

Further, in the present embodiment, the lubricant reservoir 8 is formed on the guide surface 6 with a plurality of intersecting grooves 8a. However, grooves on the surface of the machining tool 17 which do not intersect are arranged at regular intervals. By providing and swinging the tool 17 to plastically deform a plurality of grooves that do not intersect the guide surface of the mold, a plurality of grooves 8a that do not intersect corresponding to the grooves of the mold are formed. Of the lubricant reservoir 8 (see FIG. 6).
(A)) may be used. Similarly, a lubricant reservoir 8 is formed on the guide surface 7 provided on the outer peripheral surface of the cage (see FIG. 6).
(B)) can also be used. Further, it is of course possible to employ protrusions or holes arranged according to regularity or arranged irregularly. The other configuration / effects are the same as those in the first embodiment.

[0048]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, it is possible to improve the effect of retaining the lubricant in the crown type cage and eliminate the lack of lubrication. That is, the required irregularities or grooves are uniformly applied to the mold, and the retainer injection-molded by this mold is transferred with the uniform irregularities or grooves of the mold, so that a stable oil retention effect is maintained. A vessel
It is inexpensive and can be mass-produced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a rolling ball bearing in which a crown cage is incorporated.

FIG. 2 is a perspective view of a crown-shaped cage.

3A and 3B are schematic views showing a process of forming a lubricant reservoir on a pocket surface in a crown-shaped cage, FIG. 3A is a schematic view of a process of forming irregularities or grooves in a mold, and FIG. A schematic view of a die having grooves formed therein, (c) a schematic cross-sectional view of a state where a lubricant reservoir is formed on the pocket surface by injection molding, and (d) a lubricant reservoir formed on the pocket surface. The elements on larger scale of a state.

FIG. 4 is a cross-sectional view of the crown-shaped cage, showing an enlarged main part thereof.

FIG. 5 is a perspective view showing another shape of the crown-shaped cage.

FIG. 6 is a cross-sectional view of a cage provided with a guide surface, in which (a) is
In the cross-sectional view of the configuration in which the guide surface is provided on the inner peripheral surface of the cage, the portion surrounded by the broken line circle is an enlarged schematic cross-sectional view of the main part when the pocket is axially sectioned and seen from the A direction, Each of the enlarged schematic cross-sectional views taken along the line II-II is shown, and (b) is a cross-sectional view of a configuration in which a guide surface is provided on the outer peripheral surface of the cage. An enlarged schematic cross-sectional view of a main part taken along line III-III is shown.

FIG. 7 is a schematic view showing a step of another manufacturing method, (a) is a schematic view of a step of forming irregularities or grooves in a mold, and (b).
Is a schematic view of a mold having concavities and convexities, and (c) is a schematic perspective view showing a cage in which a lubricant reservoir is formed on a pocket surface by injection molding with a part of the cage omitted.

FIG. 8 is a schematic view showing a step of another manufacturing method, (a) is a schematic view of a step of forming irregularities or grooves in a mold, (b)
Is a schematic view of a mold having concavities and convexities, and (c) is a schematic perspective view showing a cage in which a lubricant reservoir is formed on a pocket surface by injection molding with a part of the cage omitted.

FIG. 9 is a schematic view showing steps of another manufacturing method.

FIG. 10 is a schematic view showing steps of another manufacturing method.

FIG. 11 is a schematic view showing a step of another manufacturing method, (a)
Is a schematic view showing a state in which a tool surrounding a portion corresponding to the guide surface of the die is pressed and rocked, (b) is an enlarged schematic view in which a groove is provided in the portion corresponding to the guide surface of the die, (c) is It is an abbreviated schematic view showing the vicinity of the guide surface of the cage, and a portion surrounded by a broken line circle is an enlarged schematic view in which a lubricant reservoir is formed on the guide surface.

[Explanation of symbols]

1: Outer ring 2: Inner ring 3: Rolling element 4: Crown type cage 4b: outer peripheral surface 4c: inner peripheral surface 5: Pocket 5b: Pocket surface 6, 7: guide surface 8: Lubricant reservoir 9a, 9b: mold 11, 12, 13, 14, 15, 16, 17: Processing tool

Claims (8)

[Claims] 1. A method for manufacturing a crown retainer for ball bearings, which is made of a synthetic resin and is formed by a die, which comprises rolling, laser machining, or turning to form a large number of uniform die parts at desired locations. Characterized by processing unevenness or grooves and then injecting molten resin into the cavity of the processed mold to transfer and form a lubricant reservoir consisting of many uniform unevennesses or grooves at desired locations. And a method for manufacturing a crown cage for rolling ball bearings. 2. A mold used for manufacturing a synthetic resin crown-shaped cage to be molded, which is formed by rolling, laser processing, or turning to obtain a large number of uniform concaves and convexes at desired locations. A die for manufacturing a crown type cage used in the method for manufacturing a crown type cage for rolling ball bearings according to claim 1, wherein the groove is machined. 3. A synthetic resin crown-shaped cage to be mold-molded, wherein the cage is formed by rolling, laser processing, or turning to form a large number of uniform irregularities or grooves at desired locations. A crown-shaped cage for rolling ball bearings, characterized in that a lubricant reservoir portion having a large number of uniform concaves and convexes or a plurality of grooves is transferred at a desired position during injection molding. 4. The lubricant reservoir comprising a large number of uniform concaves and convexes or a plurality of grooves is transferred to the surface of each cage pocket portion which is in sliding contact with the rolling element. Crown type cage for rolling ball bearings. 5. An outer ring guide cage, wherein a large number of uniform irregularities or a lubricant reservoir formed of a plurality of grooves are transferred over the entire area of the outer circumferential surface of the cage which is in sliding contact with the inner surface of the outer ring. The crown type cage for rolling ball bearings according to claim 3. 6. An inner ring guide cage, wherein a large number of uniform concaves and convexes or a lubricant reservoir comprising a plurality of grooves are transferred over the entire area of the inner circumferential surface of the cage which is in sliding contact with the outer surface of the inner ring. The crown type cage for a rolling ball bearing according to claim 3, characterized in that. 7. A lubricant reservoir comprising a large number of uniform concaves and convexes or a plurality of grooves is arranged according to regularity,
Alternatively, the crown-shaped cage for rolling ball bearings according to claim 3 or 6, wherein the projections or holes are arranged irregularly, or a plurality of non-intersecting grooves or a plurality of intersecting grooves. 8. A rolling ball bearing comprising at least a pair of bearing rings, a plurality of balls incorporated between the bearing rings, and a crown-shaped cage for guiding and holding the balls, the crown-shaped bearing being provided. The container is formed by rolling, laser processing, or turning to form a large number of uniform irregularities or grooves at the desired locations, and the cage is provided with a lubricant reservoir consisting of a large number of uniform irregularities or grooves at the desired locations. A rolling ball bearing characterized by being transferred at the time of injection molding.