JP2007024171A - Cage for rolling bearing, and rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cage for a rolling bearing, and the rolling bearing using the cage obtaining a porous resin molding by injection molding, having no defect such as a crack in a claw part, and supplying sufficient lubricating oil to a rolling surface from a pocket part. <P>SOLUTION: The cage for the rolling element guide type rolling bearing which holds a rolling element of the rolling bearing in the pocket part is formed of the porous resin molding obtained by extracting a pore forming material after injection molding. The injection molding is carried out using a slide core type die, and a spherical surface is provided at least at a part of a pocket surface. The porous resin molding has communicating holes obtained by injection-molding resin with the pore forming material mixed, to obtain the molding, then dissolving the pore forming material and extracting the pore forming material from the molding using a solvent which does not dissolve the resin. The rolling bearing uses the cage. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rolling bearing cage made of a porous resin molded body, and a rolling bearing using the cage.

  Conventional cages for rolling bearings are made of metal, polyamide resin, polyacetal resin, polybutylene terephthalate resin, etc. Especially when synthetic resin is used, it can be injection molded synthetic resin alone or molded synthetic resin. Synthetic resin compositions reinforced by adding glass fiber, carbon fiber, organic fiber or the like to the material have been used. In addition, as a rolling bearing cage in which a cage material is impregnated with a lubricant to provide a lubrication function, for example, a synthetic oil is mixed with a fibrous oil conducting material and lubricating oil, and the resin composition is molded into a cage shape. (See Patent Document 1) and the like are known.

  In Patent Document 1, a fibrous oil conducting material and a lubricating oil are mixed into a synthetic resin, and the resin composition is molded into a cage shape, thereby mixing the resin and the lubricating oil before molding. In this case, the lubricating oil must withstand the molding temperature of the resin, and the type of resin that can be used, the type of lubricating oil, the viscosity, the vapor pressure, and the decomposition temperature are limited. Further, since the screw slips during injection molding, it is necessary to suppress the amount of lubricating oil that can be blended in order to stably feed the raw material into the molding machine. For this reason, the amount of lubricating oil may be insufficient depending on the usage conditions of the rolling bearing.

In order to improve the supply performance of lubricating oil to the sliding contact surface, rolling bearing cages using a porous resin obtained by a desalting method have been developed. In the cage using the porous resin, the lubricating oil can be supplied from the pocket surface that is in sliding contact with the rolling element and the surface that is in sliding contact with the raceway, and can be stably supplied over a long period of time, so the life as a bearing is long. . In addition, since the minimum necessary amount of lubricating oil can be supplied to the rolling section, the stirring resistance of the lubricating oil is small, and the rotating torque is extremely low compared to the oil lubrication method and the grease lubrication method.
The porous resin can be injection-molded and can be applied as a highly accurate cage. However, when the rolling element guide-type cage performs a mold release operation as shown in FIG. 2, the claw portion 1b is forcibly removed. Therefore, the material needs to have sufficient flexibility, and cracks 1c and whitening may occur in the claw portion 1b in super engineering plastics such as polyether ether ketone resin and polyphenylene sulfide resin.

For the purpose of preventing such cracking of the claw part, a cage having a long and thin claw part is known (see Patent Document 2). However, a crosslinked polyphenylene sulfide resin or a pore forming material with poor flexibility is known. Highly filled material is not a sufficient measure.
Therefore, in such a case, it is necessary to employ a slide core type that is a type that does not cause the claw portion to be completely removed. A bearing ring guide type retainer is known as an invention premised on the use of a slide core type mold (see Patent Document 3).

FIG. 5 is a schematic diagram showing a mold release operation of a slide core mold in which the pocket surface is a cylindrical surface as a case where the bearing ring guide type cage is formed by a slide core mold. Fig.5 (a) is a figure which shows a part of side view of a holder | retainer, FIG.5 (b) is a figure which shows the HH cross section and slide core metal mold release operation | movement of Fig.5 (a). In FIG. 5A, a cylindrical pocket surface constituted by the claw portion 1 b of the cage 1 is formed by releasing the slide core mold 2 f in the direction of arrow J.
However, in the rolling element guide type retainer having a spherical pocket surface, the claw portion 1b is curved in FIG. 5B, so that the slide core mold cannot be pulled out in the direction of the arrow J. It will be omitted. Therefore, there is a problem that the slide core type mold for the ordinary raceway guide type cage cannot be applied to the rolling element guide type cage.
Also, when a porous resin molded body impregnated with the above lubricating oil is used as the cage material, the supply of lubricating oil to the rolling element is insufficient in the bearing ring guide type cage, and sufficient bearing characteristics are not exhibited. There is concern.
Japanese Patent Laid-Open No. 11-166541 JP 2001-165172 A JP 08-114233 A

  The present invention has been made to cope with such problems, and it is possible to obtain a porous resin molded body by injection molding. It is an object of the present invention to provide a rolling bearing cage in which the lubricant oil is sufficiently supplied to the rolling bearing and a rolling bearing using the cage.

The rolling bearing retainer of the present invention comprises a porous resin molded body obtained by extracting a pore-forming material after injection molding, and retains the rolling element of the rolling bearing in a pocket portion. The injection molding is performed using a slide core type mold.
The cage is characterized in that a spherical surface is provided on at least a part of the pocket surface.

  The porous resin molded body is formed by injection molding a resin in which the pore forming material is blended to form a molded body, and then from the molded body using a solvent that dissolves the pore forming material and does not dissolve the resin. It has a communicating hole obtained by extracting the pore forming material.

  A rolling bearing according to the present invention is a rolling bearing including an inner ring and an outer ring, a plurality of rolling elements interposed between the inner ring and the outer ring, and a cage that holds the plurality of rolling elements. The cage described above.

  The rolling bearing cage of the present invention is a rolling bearing resin cage made of a porous resin molded body obtained by extracting a pore forming material after injection molding, wherein the cage is a rolling bearing rolling element. Since it is a rolling element guide type retainer that is held in the pocket portion and is molded with a slide core type mold, it is possible to release the resin molded body highly filled with the pore forming material without difficulty during injection molding. As a result, cracks and whitening of the cage claws, which are problems when forcibly removing, do not occur. In addition, by using the rolling element guide type cage, the lubricating oil can be stably supplied to the rolling element, and a bearing having a low torque and an excellent long life can be obtained.

  Since the rolling bearing of the present invention uses the above-described cage for rolling bearings, the lubricating oil is stably supplied to the rolling surface of the rolling element, the service life is long, the torque required for rotation is small, and the torque There is little fluctuation.

The rolling bearing retainer of the present invention is a crown-shaped retainer that holds the rolling elements of the rolling bearing in a pocket portion, and includes a forced removal portion when released from a normal injection mold.
FIG. 1 shows an example of a structure in which the rolling bearing cage of the present invention is molded using a slide core type mold. FIG. 1 is a partially enlarged perspective view of a crown type cage in which a resin containing a pore forming material is injection molded using a slide core mold as shown in FIG. The rolling bearing retainer 1 is formed by forming a plurality of opposing pair of retainer claws 1b, 1b on the upper surface of the annular retainer 1 body at a constant pitch in the circumferential direction. A pocket portion 1a for holding a ball, which is a rolling element, is formed between the cage claws 1b and 1b while being curved in directions approaching each other. The upper surface of the cage 1 main body is an end surface different from the inner and outer diameter surfaces of the cage as shown in FIG.
The pocket portion 1a is a part of a spherical shape constituted by the claw 1b so as to hold a ball as a rolling element, and an upper surface opening portion (pocket opening portion) of the pocket portion 1a constituted by an end portion of the claw 1b. Is a part of a circular shape.

  The rolling bearing retainer of the present invention is formed by injection molding a resin compounded with a pore forming material using a slide core type mold, eliminates excessive removal of the retainer claw portion, and the rolling element guide retainer As such, at least a part of the pocket surface has a spherical surface or a tapered surface. This eliminates defects in the claw part, and when impregnated with lubricating oil, it is a rolling element guide type, so the lubricating oil can be supplied directly to the rolling element from the cage, and the contact area with the rolling element is also Since it is large, it provides a sufficient amount of lubricating oil and exhibits excellent bearing characteristics.

The slide core type is not particularly limited as long as it is a type that installs a mechanism for sliding on the mold core part and functions so that the claw part is not forced out, for example, as shown in FIGS. The slide core format can be adopted.
FIG. 3 is a schematic view showing the mold release operation of the slide core mold in which the pocket portion is a combination of a cylindrical surface and a spherical surface. Fig.3 (a) is a figure which shows a part of side view of a holder | retainer, FIG.3 (b) is a figure which shows the BB cross section and slide core metal mold release operation | movement in Fig.3 (a). 3B, when the slide core mold 2a is released in the direction of arrow C, the release surfaces of the cage pocket spherical bottom surface 1d and the slide core mold cage spherical bottom surface portion 2b are directed in the direction of arrow C. Since it has a spherical shape that is not stressed, it is possible to avoid unreasonable action.
FIG. 4 is a schematic diagram showing a mold release operation of a slide core mold having a spherical pocket surface. 4 (a) is a view showing a part of the side view of the cage and the slide core mold releasing operation, and FIG. 4 (b) is a view showing a DD cross section of FIG. 4 (a). FIG. 4C is a view showing a state in which the slide core mold 2c of FIG. 4B is rotated by 90 degrees. When the retainer spherical surface portion 2d of the slide core mold 2c in FIG. 4 (a) is rotated 90 degrees, the shape of the retainer spherical surface portion 2e of the slide core mold 2c in FIG. 4 (c) is obtained. The width F is set to be smaller than the opening width E. In FIG. 4A, since the mold width of the slide core mold 2c is larger than the pocket opening width E, if the mold is released in the G direction as it is, it will be forcibly removed. Therefore, before releasing the mold, the slide core mold 2c is rotated by 90 degrees as shown in FIG. 4 (c) to obtain the mold width F of the slide core mold 2c smaller than the pocket opening width E, Forcibly removing operation can be avoided by releasing in the direction.

  The rolling element guide type retainer is not particularly limited as long as the cage pocket surface is in sliding contact with the rolling element within the bearing and the position of the rolling element is determined by the position of the rolling element. The pocket surface is most preferably in a form in which at least a part of the spherical surface is guided by the rolling elements. Moreover, even if the pocket surface guided to the rolling element is a tapered surface, good characteristics are exhibited.

  The cage for a rolling bearing according to the present invention is obtained by injection molding a resin containing a pore forming material and then extracting the pore forming material contained in the molded body. For example, water-soluble powder B having a melting point Y ° C higher than X ° C is blended with resin A having an injection molding temperature X ° C, injection-molded at X ° C, and a molded body is taken out from the mold. The water-soluble powder B is extracted from the obtained molded body with water to obtain a rolling bearing cage which is a porous resin molded body.

The resin material used for the cage of the present invention may be any material that can be injection-molded and has sufficient heat resistance, oil resistance, mechanical strength, etc. as the cage and bearing material.
For example, polyethylene resin such as low density polyethylene, high density polyethylene, ultra high molecular weight polyethylene, modified polyethylene resin, water cross-linked polyolefin resin, polyamide resin, aromatic polyamide resin, polypropylene resin, polyacetal resin, polyethylene terephthalate resin, polybutylene terephthalate resin , Polystyrene resin, polycarbonate resin, tetrafluoroethylene / hexafluoropropylene copolymer resin, tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer resin, ethylene / tetrafluoroethylene copolymer resin, polyphenylene sulfide resin, polyether ketone resin , Polyetheretherketone (PEEK) resin, polyetherimide resin, polyamideimide resin, thermoplastic polyimide Fat, wholly aromatic polyester resin, thermosetting polyimide resin, epoxy resin, phenol resin can be exemplified. Moreover, the mixture of 2 or more types of materials chosen from the said synthetic resin, ie, a polymer alloy, etc. can be illustrated.

The pore-forming material is a substance that has a melting point higher than the molding temperature of the resin and can be extracted by being dissolved from the molded body using a solvent that does not dissolve the resin after being blended with the resin to form a molded body. If you can use it.
The pore forming material is preferably a water-soluble substance that facilitates the washing and extracting process. Further, an alkaline substance, preferably a weak alkaline substance that can be used as a rust preventive is preferred. Examples of the weak alkali salt include organic alkali metal salts, organic alkaline earth metal salts, inorganic alkali metal salts, inorganic alkaline earth metal salts, and the like. It is preferable to use an organic alkali metal salt or an organic alkaline earth metal salt because even when the unextracted component falls off, it is relatively soft and hardly damages the rolling surface and the sliding surface. In addition, you may use these metal salts 1 type or in mixture of 2 or more types. In addition, it is preferable to use a water-soluble weak alkali salt because inexpensive water can be used as a cleaning solvent, and waste liquid treatment at the time of pore formation is facilitated.
In order to prevent melting of the pore forming material during molding, it is preferable to use a substance having a melting point higher than the molding temperature of the resin used for the pore forming material.

Examples of water-soluble organic alkali metal salts that can be suitably used in the present invention include sodium benzoate (melting point 430 ° C.), sodium acetate (melting point 320 ° C.) or sodium sebacate (melting point 340 ° C.), sodium succinate, stearin. Examples include sodium acid. Sodium benzoate, sodium acetate, or sodium sebacate is particularly preferred because of its high melting point, compatibility with various resins, and high water solubility.
Examples of the inorganic alkali metal salt include potassium carbonate, sodium molybdate, potassium molybdate, sodium tungstate, sodium triphosphate, sodium pyrophosphate, and the like.

The pore-forming material is preferably controlled to have an average particle size of 1 to 500 μm. The mixing ratio of the pore-forming material is 30% to 90% by volume, preferably 40% to 90% by volume, based on the total amount including other materials such as resin powder, pore-forming material and filler. If it is 30% by volume or less, the pores of the porous body are difficult to become communication holes, and if it is 90% by volume or more, desired mechanical strength cannot be obtained.
Moreover, you may mix | blend the filler insoluble in the solvent used for extraction of a pore formation material at the time of a mixing | blending. For example, when the solvent is water, glass fibers, carbon fibers, and the like can be blended for the purpose of improving the mechanical strength of the porous body.

The mixing method of the resin material and the pore forming material is not particularly limited, and a kneading method generally used for mixing the resin such as dry blending and melt kneading can be applied.
Alternatively, a method may be used in which the pore-forming material is dissolved in a liquid solvent to form a transparent solution, and then resin powder is dispersed and mixed in the solution, and then the solvent is removed. The method of dispersing and mixing is not particularly limited as long as it can be mixed in a liquid, and examples thereof include a ball mill, an ultrasonic disperser, a homogenizer, a juicer mixer, and a Henschel mixer. It is also effective to add a small amount of a surfactant in order to suppress separation of the dispersion. At the time of mixing, the amount of solvent is secured so that the pore forming material is completely dissolved by mixing. As a method for removing the solvent, methods such as heat evaporation, vacuum evaporation, bubbling with nitrogen gas, dialysis, and lyophilization can be used. Since the method is easy and the equipment is inexpensive, it is preferable to remove the liquid solvent by heat evaporation.
A mixture in which a pore molding material is blended with a resin is molded into a cage shape by injection molding. Any known injection molding method and injection molding machine can be used.

Extraction of the pore-forming material from the obtained molded body is performed by washing the molded body with a solvent that dissolves the pore-forming material and does not dissolve the resin.
As the solvent, for example, water and alcohol solvents, ester solvents, ketone solvents, and the like can be used as solvents compatible with water. Among these, it is appropriately selected according to the above conditions depending on the type of resin and pore forming material. These solvents may be used alone or in combination of two or more. It is preferable to use water because of its advantages such as easy waste liquid treatment and low cost.
By performing the extraction treatment, the portion filled with the pore forming material is dissolved, and a porous resin molded body in which pores are formed in the dissolved portion is obtained.

The rolling bearing cage of the present invention is used by impregnating a lubricant into the obtained molded body having communication holes. As the lubricant, lubricating oil is preferable, for example, mineral oil such as spindle oil, refrigerating machine oil, turbine oil, machine oil, dynamo oil, paraffinic mineral oil, naphthenic mineral oil, polybutene, poly-α-olefin, alkylbenzene, alkylnaphthalene. , Hydrocarbon synthetic oils such as alicyclic compounds, or natural oils and fats, polyol ester oils, phosphate esters, diester oils, polyglycol oils, silicone oils, polyphenyl ether oils, alkyl diphenyl ether oils, fluorinated oils, etc. Any commonly used lubricating oil such as non-hydrocarbon synthetic oil can be used without particular limitation.
The impregnation method may be any method that can impregnate the inside of the porous resin molded body. The reduced pressure impregnation in which the molded body is immersed in an impregnation tank filled with lubricating oil and then impregnated under reduced pressure is preferable. Further, when a high viscosity silicone oil or the like is used, it can be impregnated under pressure. It is good also as a pressure-reduced-pressure impregnation combining these.
In the above lubricating oil, as long as the purpose of the present invention is not impaired, an extreme pressure agent, an antioxidant, a rust inhibitor, a pour point depressant, an ashless dispersant, a metal detergent, an interface Activators, wear modifiers, etc. can be blended. As an antioxidant, a phenol type, an amine type, a sulfur type compound, etc. can be used individually or in mixture.

An example of a rolling bearing using the cage of the present invention is shown in FIG. FIG. 6 is a cross-sectional view of a grease-filled deep groove ball bearing.
In the grease-filled deep groove ball bearing 3, an inner ring 4 having a rolling surface 4a on the outer peripheral surface and an outer ring 5 having a rolling surface 5a on the inner peripheral surface are arranged concentrically, and the inner ring rolling surface 4a and the outer ring rolling. A plurality of rolling elements 6 are disposed between the surface 5a. The cage 1 includes a plurality of rolling elements 6 and a seal member 7 fixed to the outer ring 5 and the like. Lubricating grease 8 is enclosed around the rolling elements 6.

This bearing can be used without enclosing lubricating grease by using the rolling bearing cage of the present invention as a cage and incorporating a cage impregnated with lubricating oil. In applications where low torque and torque stability are prioritized, it is possible to operate with only the lubricating oil contained in the cage without enclosing lubricating grease.
Further, even when lubricating grease is enclosed, the operation can be performed in a smaller amount than the amount of lubricating grease enclosed normally.
When the lubricating grease is enclosed, the lubricating oil that is impregnated in the porous resin molded body of the cage and the oil that mutually dissolves under the rolling bearing operating environment conditions are used as the base oil of the lubricating grease. The mutually soluble oils are preferably oils having the same chemical structure, and more preferably, the lubricating oil and the base oil are the same type of oil and have substantially the same viscosity. preferable. By using together with this lubricating grease, since the base oil consumed by the lubricating grease is supplied from the lubricating oil impregnated in the cage, the amount of lubricating grease enclosed can be reduced. The amount of lubrication grease is 20% or less, preferably 5 to 20% of the total space volume of the bearing. If the amount of grease filled exceeds 20%, grease leakage and torque fluctuation may occur easily.

Examples of the base oil constituting the lubricating grease include mineral oils such as paraffinic mineral oil and naphthenic mineral oil, hydrocarbon synthetic oils such as polybutene, poly-α-olefin oil, alkylbenzene, alkylnaphthalene, and alicyclic compounds, or Non-hydrocarbon synthetic oils such as natural fats and oils, polyol ester oils, phosphate esters, diester oils, polyglycol oils, silicone oils, polyphenyl ether oils, alkyl diphenyl ether oils, fluorinated oils, etc. As long as it is used as an oil, it can be used without any particular limitation.
Thickeners include metal soap thickeners such as aluminum soap, lithium soap, sodium soap, composite lithium soap, composite calcium soap, composite aluminum soap, urea compounds such as diurea compounds and polyurea compounds, polytetra Fluorine resin powder such as fluoroethylene resin can be used. These thickeners may be used alone or in combination of two or more.
Further, known additives added to lubricating grease, for example, extreme pressure agents, amine-based, antioxidants such as phenolic compounds, metal deactivators such as benzotriazole, viscosity index improvers such as polymethacrylate and polystyrene, Examples thereof include solid lubricants such as molybdenum disulfide and graphite. These can be added alone or in combination of two or more.

  The rolling bearing having the above-described configuration incorporating the cage of the present invention has a small torque required for rotation and a small torque fluctuation. For this reason, since excellent lubrication is performed over a long period of time, excellent durability is exhibited. In addition, even when lubricating grease is enclosed, the amount of lubricating grease enclosed can be made smaller than usual, so that a rolling bearing with less lubricating grease leakage can be obtained.

The present invention will be specifically described with reference to examples and comparative examples, but is not limited to these examples.
A porous resin material and a bearing life test having the following composition were used in Example 1 and Comparative Example 1 shown below.
[Composition of porous resin material]
PEEK (50% by volume): 150P made by Victrex
Carbon fiber (10% by volume): HTAC6S manufactured by Toho Tenax Co., Ltd.
Sodium triphosphate (40% by volume): Sodium tripolyphosphate manufactured by Taihei Chemical Industry Co., Ltd. [Bearing life test]
A rolling bearing (608 open) incorporating a test cage was prepared and rotated at a bearing temperature of 150 ° C and a rotational speed of 500 rpm under a vacuum of 1 to 10 x 10 ^-5 Pa and a thrust load of 981 N. The time (h) until the torque value immediately after starting increased to 5 times was measured. The results are shown in Table 1.
Table 1 shows that the bearings with an abnormal rise time of 50 hours or more were evaluated as being excellent in the life test, and “X” was shown in Table 1 for less than 50 hours.

Example 1
The porous resin material was injection-molded with a slide core type mold to form a cage shape shown in FIG. The pocket surface is a combination of a conical surface and a spherical surface, and is a rolling element guide type retainer in which the spherical surface is guided by the rolling element. This cage was immersed in ion exchange water at 80 ° C. for 100 hours, the pore forming material was extracted, and dried at 200 ° C. for 3 hours. Next, this cage is immersed in cyclopentane oil (NYE LUBRICANTS NYE SYNTHETIC OIL 2001A) heated to 150 ° C. in a vacuum (0.1 atm) atmosphere for 100 hours, and all pores are impregnated with oil for bearing life test. A cage was obtained. Two rolling bearings (608 open) were produced using this cage (steel ball diameter 4 mm, cage pocket diameter 4.2 mm), and the bearing life test was conducted.

Comparative Example 1
The porous resin material was injection-molded with a slide core type mold to obtain a cage shape shown in FIG. The pocket surface is an inner ring guide type cage that is a cylindrical surface. This cage was immersed in ion exchange water at 80 ° C. for 100 hours, the pore forming material was extracted, and dried at 200 ° C. for 3 hours. Next, this cage is immersed in cyclopentane oil (NYE LUBRICANTS NYE SYNTHETIC OIL 2001A) heated to 150 ° C. in a vacuum (0.1 atm) atmosphere for 100 hours, and all pores are impregnated with oil for bearing life test. A cage was obtained. Two rolling bearings (608 open) were produced using this cage (steel ball diameter 4 mm, cage pocket diameter 4.2 mm), and the bearing life test was conducted.

表１に示すように、実施例の転動体案内型保持器では真空、高温下での軸受寿命試験の基準をクリアできたが、比較例の内輪案内型保持器では基準をクリアできなかった。

As shown in Table 1, the rolling element guide type cage of the example could clear the standard of the bearing life test under vacuum and high temperature, but the reference of the inner ring guide type cage of the comparative example could not be cleared.

  Since the rolling bearing cage of the present invention can stably supply the lubricating oil to the rolling elements, the rolling bearing using this cage exhibits excellent durability with low torque and small fluctuation width. . For this reason, it can be used as a versatile basic part.

It is a partial expansion perspective view of a crown type holder. It is a figure which shows mold release operation | movement of a rolling element guide type holder. It is a schematic diagram which shows the mold release operation | movement of the slide core metal mold | die whose pocket part is a combination of a cylindrical surface and a spherical surface. It is a schematic diagram which shows the mold release operation | movement of the slide core metal mold | die whose pocket surface is a spherical surface. It is a schematic diagram which shows the mold release operation | movement of the slide core metal mold | die whose pocket surface is a cylindrical surface. It is sectional drawing of a grease enclosure deep groove ball bearing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crown type holder 1a Pocket 1b Cage claw 1c Cage crack part 1d Cage spherical bottom face 2 Core mold 2a Slide core mold 2b Slide core mold holder spherical bottom part 2c Slide core mold 2d Slide core mold Cage spherical bottom 2e Slide core mold cage spherical bottom (2d rotated 90 degrees)
2f Slide core mold 3 Grease filled deep groove ball bearing 4 Inner ring 4a Rolling surface 5 Outer ring 5a Rolling surface 6 Rolling element 7 Seal member 8 Lubrication grease

Claims (4)

A rolling element guide type rolling bearing retainer comprising a porous resin molded body obtained by extracting a pore forming material after injection molding, and holding a rolling element of a rolling bearing in a pocket portion,
The roller bearing retainer is characterized in that the injection molding is performed using a slide core type mold.   The rolling bearing retainer according to claim 1, wherein the retainer includes a spherical surface in at least a part of the pocket surface.   The porous resin molded body is formed by injection molding a resin in which the pore forming material is blended to form a molded body, and then using the solvent that dissolves the pore forming material and does not dissolve the resin from the molded body. The rolling bearing retainer according to claim 1 or 2, further comprising a communication hole obtained by extracting the pore forming material. A rolling bearing comprising an inner ring and an outer ring, a plurality of rolling elements interposed between the inner ring and the outer ring, and a cage for holding the plurality of rolling elements,
A rolling bearing characterized in that the cage is a rolling bearing cage according to claim 1, 2 or 3.

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