JP2005121234A - Rolling bearing filled with lubricant-containing polymer and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing filled with lubricant-containing polymer in which a retainer is covered by the lubricant-containing polymer by a simple method even if the rolling bearing is formed such that the retainer is projected outward from the end face of either of an inner ring and an outer ring and a method of manufacturing the rolling bearing. <P>SOLUTION: This rolling bearing filled with the lubricant-containing polymer comprises the inner ring 2, the outer ring 3, a plurality of rolling elements 4 interposed between the inner ring 2 and the outer ring 3, and the retainer 5 holding the rolling elements 4 and projected outward from the end face of either of the inner ring 2 and the outer ring 3. The rolling bearing is formed such that the retainer 5 is covered by the lubricant-containing polymer 6 filled in a space formed by the inner ring 2, the outer ring 3, the rolling elements 4, and the retainer 5. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rolling bearing filled with a lubricant-containing polymer and a manufacturing method thereof.

  Generally, the space between the outer ring and inner ring (track ring) of a rolling bearing and rolling elements is filled with lubricating oil or grease in order to impart lubricity. However, since these lubricating oils and greases are liquid or semi-solid substances, there is a problem that they are scattered or fluidized during the rotation of the bearing. Therefore, in order to prevent the scattering and fluidization, a method of sealing the rolling bearing with a seal plate or the like is generally performed. For this reason, it has been difficult to use a lubricant or grease for small special purpose bearings in order to impart lubricity.

  In order to solve this problem, in recent years, a method has been proposed in which a polymer containing a lubricant is filled in the space between the inner and outer rings of the bearing and the rolling elements. For example, Japanese Patent Publication No. 63-23239 discloses that a lubricant-containing polymer (plastic grease) made of grease and polyethylene is filled in a space formed by an inner ring, an outer ring and rolling elements of a bearing.

  As examples of this lubricant-containing polymer-filled rolling bearing, there are known deep groove ball bearings, cylindrical roller bearings, and self-aligning roller bearings whose inner ring end face and outer ring end face coincide. As a method for filling the lubricant-containing polymer, a full pack in which the end face of the bearing and the lubricant-containing polymer coincide is common.

  These lubricant-containing polymer-filled rolling bearings have a structure in which the end faces of the inner ring and outer ring coincide with each other, and the cage does not protrude from the end face, such as general deep groove ball bearings, cylindrical roller bearings, and self-aligning roller bearings. Therefore, the full pack can be manufactured by a relatively simple method.

  However, unlike the general lubricant-filled rolling bearings described above, the inner ring and outer ring have different thicknesses in the height direction (width direction), the cage protrudes from the end face of the inner ring or outer ring, and the inner ring and outer ring For rolling bearings having a structure in which the axial positions of the end faces do not coincide, that is, tapered roller bearings, etc., those that correspond to the full pack are manufactured by a simple method such as being formed by being sandwiched between flat plates. There was a problem that it was difficult.

  Therefore, it has been practically difficult to provide a lubricant-containing polymer-filled rolling bearing having such a structure.

  An object of the present invention is to solve such a conventional problem. The thicknesses of the inner ring and the outer ring are different in the height direction, and the cage is located outside the end face of either the inner ring or the outer ring. It is an object of the present invention to provide a lubricant-containing polymer-filled rolling bearing in which a cage is covered with a lubricant-containing polymer, which can be manufactured by a simple method even when the rolling bearing has a structure projecting in the direction toward the surface. It is what. Moreover, it aims at providing the manufacturing method.

  In order to achieve this object, the present invention provides a pair of inner and outer rings, a plurality of rolling elements interposed between the inner and outer rings, holding the rolling elements, and any of the inner and outer rings. A lubricant-containing polymer-filled rolling comprising: a cage projecting outward from one of the end faces; and a lubricant-containing polymer filled in a space formed by the inner ring and outer ring, the rolling elements and the cage. A bearing, wherein the cage provides a lubricant-containing polymer-filled rolling bearing covered by the lubricant-containing polymer.

  The lubricant-containing polymer-filled rolling bearing having this structure improves reliability because the lubricant-containing polymer not only functions as a lubricant supply member but also functions as a seal against intrusion of foreign matters such as water.

  Further, in the lubricant-containing polymer-filled rolling bearing according to the present invention, the rolling element can be constituted by a tapered roller.

  In addition, the present invention provides an inner ring and an outer ring, a plurality of rolling elements interposed between the inner ring and the outer ring, and holding the rolling element, and is provided on an outer side from an end surface of any one of the inner ring and the outer ring. And a lubricant-containing polymer filled in a space formed by the inner ring, the outer ring, the rolling elements and the cage, and a lubricant-containing polymer-filled rolling bearing manufacturing method. Then, after assembling the rolling bearing, a step of applying a release agent or grease to the outer peripheral surface of the inner ring, the inner peripheral surface of the outer ring, the surface of the rolling element, and the surface of the cage; and the release agent After the application, the lower jig having a structure in which the end face with the wider inner ring is in contact and the end face with the narrower outer ring is not in contact with the cage, and the outer ring has a wide width. The end of which the inner ring is in contact and the inner ring is narrower And the upper jig provided with a structure in which the cage does not come into contact with the rolling bearing, the lubricant containing the lubricant filled in the space formed by the inner ring, the outer ring, the rolling element and the cage The present invention provides a method for producing a lubricant-containing polymer-filled rolling bearing comprising a step of solidifying a polymer.

  Examples of the lubricant-containing polymer that can be used in the present invention include a synthetic resin selected from the group of polyolefin resins having basically the same chemical structure such as polyethylene, polypropylene, polybutylene, and polymethylpentene. Paraffinic hydrocarbon oil such as poly-α-olefin oil, naphthenic hydrocarbon oil, mineral oil, ether oil such as dialkyldiphenyl ether oil, ester oil such as phthalate ester, etc., either alone or in the form of mixed oil The raw material mixed and heated is plasticized by heating above the melting point of the resin, and then cooled to solid form. Antioxidant, rust inhibitor, antiwear agent, antifoam in advance in the lubricant What added various additives, such as an agent and an extreme pressure agent, may be used.

  The composition ratio of the lubricant-containing polymer is 10 to 50% by weight of polyolefin resin and 90 to 50% by weight of lubricant with respect to the total weight.

  When the polyolefin-based resin is less than 10% by weight, a certain level of hardness and strength cannot be obtained. For example, when a load is applied due to rotation of a bearing, it becomes difficult to maintain the initial shape. There is a high possibility that problems such as desorption from the internal space of the bearing will occur.

  Further, when the polyolefin resin exceeds 50% by weight (that is, when the lubricant is less than 50% by weight), the supply of the lubricant to the bearing is reduced and the life of the bearing is shortened.

The group of synthetic resins has the same basic structure but different average molecular weights, ranging from 700 to 5 × 10 ⁶ . That is, the wax an average molecular weight of 700~1 × 10 ⁴ (e.g., polyethylene wax) and those classified to, those of relatively low molecular weight an average molecular weight of ^{1 × 10 4 ~1 × 10 6} , the average molecular weight Those having an ultrahigh molecular weight of 1 × 10 ^{6 to} 5 × 10 ⁶ are used alone or mixed as necessary. A combination of a relatively low molecular weight material and a lubricant provides a lubricant-containing polymer having a certain degree of mechanical strength, lubricant supply capability, and oil retention. If some of the relatively low molecular weights are replaced with those classified as waxes, the difference in molecular weight between those classified as waxes and the lubricating oil is small, so the affinity with the lubricating oil is low. As a result, the oil retaining property of the lubricant-containing polymer is improved, and the lubricant can be supplied for a long time. However, on the other hand, the mechanical strength tends to decrease.

  As the wax, in addition to a polyolefin resin such as polyethylene wax, any hydrocarbon-based resin having a melting point in the range of 100 to 130 ° C. or higher (for example, paraffin-based synthetic wax) can be used.

  On the other hand, if it is replaced with an ultra-high molecular weight, the difference in molecular weight between the ultra-high molecular weight and the lubricating oil is large, so the affinity with the lubricating oil is reduced, resulting in a decrease in oil retention and lubrication. Lubricant seepage from oil-containing polymers is accelerated. Thereby, the time to reach the amount of lubricant that can be supplied from the lubricant-containing polymer is shortened, and the life of the bearing is shortened. However, the mechanical strength is improved.

  Considering the balance of moldability, mechanical strength, oil retention, and lubricant supply amount, the composition ratio of the lubricant-containing polymer is 0 to 5% by weight classified as wax, and 8 is relatively low molecular weight. It is preferable that ˜48%, ultrahigh molecular weight one is 2 to 15% by weight, and the total amount of the three resins is 10 to 50% by weight (the remainder is 90 to 50% by weight lubricant).

As one of the mechanical strengths, the hardness “HD _A ” of the lubricant-containing polymer of the present invention is preferably in the range of 65 to 85, more preferably in the range of 70 to 80. If the hardness “HD _A ” is less than 65, it is weak in strength and may be damaged by rotation of the bearing. On the other hand, when the hardness “HD _A ” exceeds 85, the force that restrains the roller (rolling element) is large, thereby increasing the torque of the bearing or increasing the heat generated by the rotation of the bearing. There is a risk that the temperature of

  In order to improve the mechanical strength of the lubricant-containing polymer of the present invention, a product obtained by adding the following thermoplastic resin and thermosetting resin to the polyolefin resin may be used.

  As the thermoplastic resin, resins such as polyamide, polycarbonate, polybutylene terephthalate, polyphenylene sulfide, polyether sulfone, polyether ether ketone, polyamide imide, polystyrene, and ABS resin can be used.

  As the thermosetting resin, each resin such as unsaturated polyester resin, urea resin, melanin resin, phenol resin, polyimide resin, and epoxy resin can be used. These resins may be used alone or in combination.

  Furthermore, in order to disperse the polyolefin resin and other resins in a more uniform state, an appropriate compatibilizing agent may be added as necessary.

  Moreover, in order to improve mechanical strength, you may add a filler. As this filler, for example, inorganic whiskers such as calcium carbonate, magnesium carbonate, potassium titanate whisker and aluminum borate whisker, or inorganic fibers such as glass fiber and metal fiber and those braided into a cloth shape, In the case of an organic compound, carbon black, graphite powder, carbon fiber, aramid fiber, polyester fiber, or the like may be added.

  Furthermore, for the purpose of preventing deterioration of polyolefin resin due to heat, anti-aging agents such as N, N′-diphenyl-p-phenyldiamine, 2,2′-methylenebis (4-ethyl-6-t-butylphenol), In order to prevent degradation due to light, 2-hydroxy-4-n-octoxybenzophenone, 2- (2'-hydroxy-3'-t-butyl-5'-methyl-phenyl) -5-chlorobenzo You may add ultraviolet absorbers, such as a triazole.

  The addition amount of all the above additives (other than the polyolefin resin and lubricant) is preferably 20% by weight or less of the total amount of the molding raw material as a whole in order to maintain the supply capability of the lubricant. .

  As the polymer material that can be used in the present invention, any thermoplastic resin that can be injection-molded can be used in addition to those based on the polyolefin resin as described above, and the oil content can be increased. Examples of the material include a polyester-based elastomer. In addition to the thermoplastic resin, thermosetting resins such as polyurethane and polyurea elastomer can also be used.

  In the case of polyurethane, a urethane prepolymer containing an isocyanate group as a reaction raw material using grease as a lubricant and an amine-based curing agent are uniformly mixed with grease or one of them, and then the two mixtures are mixed. Further, they are mixed, filled in the bearing, heated and reacted as necessary, and cured in a state containing grease.

  On the other hand, in the case of a polyurea elastomer, an amine component composed of a mixture of an aromatic polyamine compound containing a soft segment in the molecular chain and an aromatic diamine is used as a lubricating oil compatible with the component or a grease based on the lubricating oil. A polyisocyanate component is further added to the uniformly mixed mixture, mixed, filled in a mold having a desired shape, heated and reacted as necessary, and cured in a state containing a lubricant.

  Also, the manufacturing method of the lubricant-containing polymer-filled rolling bearing according to the present invention includes a pair of lower jig and upper jig capable of filling and solidifying the lubricant-containing polymer so as to cover the cage. It is performed using a special jig consisting of

  The lower jig has a structure that does not come into contact with the end face of the outer ring and the cage, but a gap of about 0.1 to 0.5 mm is preferably formed between the lower jig and the end face of the outer ring. In addition, a gap of about 0.5 to 2 mm is preferably formed between the cage.

  On the other hand, the upper jig has a structure that does not contact the end face of the inner ring and the cage, but a gap of about 0.1 to 0.5 mm is preferably formed between the upper jig and the end face of the inner ring. . In addition, a gap of about 0.5 to 2 mm is preferably formed between the cage.

  For the manufacturing method of the lubricant-containing polymer-filled rolling bearing according to the present invention, for example, heat molding, injection molding (insert molding), or the like can be used.

  When utilizing thermoforming, for example, the following method can be employed.

  First, after applying the release agent or grease, a lubricant-containing polymer is filled in a space formed by the inner ring, outer ring, rolling elements and cage. Next, the rolling bearing is placed at a predetermined position of the lower jig so that the wider end surface of the inner ring contacts. Next, the lower jig is heated to melt the lubricant-containing polymer filled in the space. At this time, the upper jig is also heated, but is kept in a non-contact state with the rolling bearing. Next, after melting the lubricant-containing polymer, the upper jig is placed on the rolling bearing placed on the lower jig and contacts the wider end surface of the outer ring. In this state, both jigs are rapidly cooled to solidify the lubricant-containing polymer.

  This pressurization applies a force in the order of the outer ring, the rollers, and the inner ring to ensure a normal roller position and to distribute the lubricant-containing polymer evenly around the cage, so that the lubricant-containing polymer covers the cage. I can.

  On the other hand, when using injection molding, for example, the following method can be employed.

  Prepare the same jig (mold) as the pair of upper jig and lower jig described above (however, the upper jig (mold) is provided with a pin gate for material injection), Between these jigs, a rolling bearing coated with the release agent or grease is disposed. Next, a lubricant-containing polymer is press-fitted from the pin gate into a space formed by the inner ring, outer ring, rolling element, and cage. Thereafter, the injected lubricant-containing polymer is cooled and solidified.

  The lubricant-containing polymer press-fitted from the pin gate can be covered with the lubricant-containing polymer because the lubricant-containing polymer is evenly distributed around the cage. Moreover, since the strength of the lubricant-containing polymer is increased by injection molding, the risk of breakage of the lubricant-containing polymer coated on the protruding portion of the cage can be reduced.

  As the release agent, a fluorine release agent is preferably used. Specifically, a perfluoroalkyl group-containing phosphate ester having 4 to 20 carbon atoms or a mixture of a salt thereof and silicone oil (for example, described in JP-B-53-23270, JP-B-53-23271), A mixture of a perfluoroalkyl group-containing phosphate ester having 4 to 20 carbon atoms or a salt thereof and a silicon varnish (for example, described in JP-B-57-48035), a perfluoroalkyl group-containing polyether compound, silicon oil, etc. (For example, described in JP-B-59-32513), a mixture of a perfluoroalkyl group-containing urethane compound and an organosilsesquioxane ladder polymer (for example, described in JP-A-63-104804) Etc. Moreover, in the said mixture, what does not contain a silicon compound can also be used. Furthermore, the fluorine-based mold release agent may contain the above-mentioned compound as a main component and an appropriate solvent (for example, water, isooctane, HCFC-141b, etc.).

  On the other hand, the type of the grease is not particularly limited, but it is preferable to consider the affinity with the resin and lubricant forming the lubricant-containing polymer described above.

  In other words, in the present invention, the lubricant-containing polymer is once melted at the time of filling, but at that time, the resin constituting the lubricant-containing polymer and the lubricant are in a compatible state, and the resin Is in a state where it is most likely to incorporate other components having compatibility therewith. Therefore, when the grease and the resin film formed on the surface of the rolling element are compatible, the grease is taken into the molten resin, and the lubricant-containing polymer is solidified so as to come into contact with the rolling element. As a result, there is a possibility that the rotation of the rolling element is constrained, and the torque reduction effect by the grease coating similar to that of the mold release agent described above may not be exhibited so much.

  Therefore, in the present invention, it is preferable to combine the resin and lubricant forming the lubricant-containing polymer and the grease with low compatibility.

  For example, if the lubricant-containing polymer resin is a polyolefin resin, the coating grease may be a fluorine grease (thickener: PTFE, base oil: perfluoropolyether, which is almost incompatible with hydrocarbon compounds. ), Silicone grease (thickener: lithium soap, base oil: phenylmethylpolysiloxane, dimethylpolysiloxane), fluorosilicone grease (thickener: lithium soap, base oil: fluorosilicone) and the like are most preferable. Also, other greases such as ester greases (thickeners: urea, lithium soap, etc.), pentaphenyl ether, tetraphenyl ether, etc. based on ester oils with high compatibility and low compatibility due to their high polarity Polyphenyl ether grease (thickener: bentonite etc.) based on polyphenyl ether can also be used.

  In addition, when the resin of the lubricant-containing polymer is a highly polar hydrocarbon compound such as a polyester elastomer, polyurea elastomer, polyurethane, etc., it is hardly compatible with the hydrocarbon compound as shown above. Fluorine grease, silicon grease, fluorosilicone grease, etc. are most suitable. Contrary to the above, hydrocarbon-based greases have long carbon chains such as mineral oil with low polarity, poly α-olefin oil, phenyl ether with a long hydrocarbon chain such as octadecyl diphenyl ether, and eicosyl naphthalene. Those having low compatibility with naphthalene having a hydrogen chain as a base oil and urea or lithium soap as a thickener can be used.

  According to the present invention, even if it is a rolling bearing provided with a cage that protrudes outward from one end face of either the inner ring or the outer ring, the cage is easily and evenly covered with the lubricant-containing polymer. Can do. As a result, for example, a roller bearing having a structure in which a cage protrudes outward from one end face of either the inner ring or the outer ring, such as a tapered roller bearing, can be used under high-speed and high-load use conditions. Reliability can be improved.

  Next, a lubricant-containing polymer-filled rolling bearing according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a sectional view showing a part of a lubricant-containing polymer-filled rolling bearing according to the present embodiment, and FIG. 2 shows a part of a manufacturing process of the lubricant-containing polymer-filled rolling bearing according to the present embodiment. Sectional drawing and FIG. 3 are the elements on larger scale of FIG.

  As shown in FIG. 1, the lubricant-containing polymer-filled rolling bearing 1 according to the present embodiment includes a plurality of cones that are rolling elements interposed between the inner ring 2 and the outer ring 3 and between the inner ring 2 and the outer ring 3. The tapered roller bearing includes a roller 4 and a cage 5 that holds the rolling element 4.

  In the space formed by the inner ring 2, the outer ring 3, the tapered roller 4 and the cage 5 of the tapered roller bearing, a lubricant-containing polymer 6 covering the cage 5 is filled and solidified.

  In the present embodiment, a lubricant-containing polymer 6 having the following composition is used.

(composition)
High-density polyethylene (classified as relatively low molecular weight) 10% by weight Ultra high molecular weight polyethylene (classified as ultra high molecular weight) 12.5% by weight Polyethylene wax (classified as wax) 2.5% by weight Mineral oil 75 Next, a manufacturing method of the lubricant-containing polymer-filled rolling bearing 1 according to the present embodiment will be described.

  The jig used in the present embodiment is composed of a lower jig 11 and an upper jig 12, as shown in FIGS.

  The lower jig 11 is formed with a concave portion 21 into which the wide side of the inner ring 2 is fitted, and a flange portion 22 is formed on the outer peripheral portion so as to face the end face 3A on the narrow side of the outer ring 3. Yes. Further, a recess 23 for accommodating the tapered roller 4 and the cage 5 is formed between the recess 21 and the flange portion 22. When the tapered roller bearing is placed on the lower jig 11, the end face 2 </ b> A having the wider inner ring 2 comes into contact with the bottom face of the recess 21, the end face 3 </ b> A of the outer ring 3, and the upper surface of the jaw 22. And a gap 7 is formed between the cage 5 and the recess 23.

  The upper jig 12 has a recess 31 into which the narrow side of the inner ring 3 is fitted, and a contact part 32 that contacts the end surface 3B on the wide side of the outer ring 3 is formed on the outer peripheral part. Further, a concave portion 33 for accommodating the tapered roller 4 and the cage 5 is formed between the concave portion 31 and the contact portion 32. When the upper jig 12 is placed on a tapered roller bearing, the end face 3B having the wider outer ring 3 comes into contact with the contact portion 32, and between the end face 2B of the inner ring 2 and the recessed portion 31, and A gap 8 is formed between the cage 5 and the recess 33.

  In order to produce the lubricant-containing polymer-filled rolling bearing 1, first, a tapered roller bearing is assembled by a normal method, and then a normal degreasing cleaning is performed. Thereafter, a release agent or grease is applied to the outer peripheral surface of the inner ring 2, the inner peripheral surface of the outer ring 3, the surfaces of the tapered rollers 4, and the surface of the cage 5 to form a release agent coating film.

  For example, the release agent coating film is formed by spraying a fluorine release agent as it is or after diluting with an appropriate diluent (for example, water, isooctane, gasoline, HCFC-141b, etc.). It is applied by a method such as coating with a brush or by immersing a tapered roller bearing in a solvent or dispersion containing the release agent. At this time, the application amount of the release agent is not particularly limited, but it is preferable that the release agent be uniformly applied so as to have a film thickness of about 0.1 to 1.0 μm.

  The method for forming the grease film (coating film) is not particularly limited. For example, after a small amount of grease is filled in the bearing, the bearing is rotated to rotate the inner peripheral surface of the outer ring, the outer peripheral surface of the inner ring, and the rolling element. In some cases, there is a method of forming a grease film on the surface of the cage. As another method, the grease is dissolved at a suitable concentration in a solvent in which the base oil dissolves and the thickener is uniformly dispersed, and then immersed in the solution and then dried to remove the solvent. It can also be formed. The thickness of the grease coating is preferably 10 to 1000 μm.

  Next, in the space formed by the outer peripheral surface of the inner ring 2, the inner peripheral surface of the outer ring 3, the surface of the tapered roller 4, and the surface of the cage 5 formed with a release agent or grease coating film, The lubricant-containing polymer 6 is filled.

  Next, the tapered roller bearing filled with the lubricant-containing polymer 6 is placed at a predetermined position of the lower jig 11. Next, this is put into a heating press machine, and the lower jig 11 is heated at a temperature of about 150 ° C. to melt the lubricant-containing polymer 6. At this time, the upper jig 12 is also heated, but is kept in a non-contact state with the tapered roller bearing. By this heating, the lubricant-containing polymer 6 is filled in the space and in the gaps 7 and 8 without gaps. For this reason, even if the rolling bearing has a structure in which the inner ring and the outer ring have different thicknesses in the height direction and the cage protrudes outward from one of the end faces of the inner ring and the outer ring, it is held by the lubricant-containing polymer. You can cover the bowl evenly.

  Next, after melting the lubricant-containing polymer 6, the tapered roller bearing together with the lower jig 11 is transferred to a cooling press machine, and the upper jig 12 is placed on the tapered roller bearing, and the width of the outer ring 3 is increased. Pressure is applied to the wider end surface 3B. By this pressurization, a force is applied in the order of the outer ring 3, the tapered roller 4, and the inner ring 2 from the upper jig 12 to the lower jig 11, and a proper roller position can be secured. In this state, it was rapidly cooled (see FIG. 2) to solidify the lubricant-containing polymer 6.

  Thereafter, the tapered roller bearing was taken out of the jig and subjected to a desired finishing process as required, whereby a lubricant-containing polymer-filled rolling bearing 1 was obtained.

  The lubricant-containing polymer-filled rolling bearing 1 obtained by the above operation rotated smoothly at a low torque and showed good lubricity.

  Next, a method for forming the lubricant-containing polymer-filled rolling bearing 1 according to the present embodiment by injection molding will be described.

  In this injection molding, a pair of upper and lower molds having shapes similar to those of the lower jig 11 and the upper jig 12 described above are provided except that a pin gate for material injection is formed on the upper mold. Used. In this embodiment, injection molding was performed using an apparatus in which the hopper portion of a screw type injection molding machine disclosed in Japanese Patent Laid-Open No. 8-309793 is improved.

  First, a tapered roller bearing is assembled by a normal method, and then subjected to normal degreasing and cleaning. Next, a release agent or grease is applied to the outer peripheral surface of the inner ring 2 of the tapered roller bearing, the inner peripheral surface of the outer ring 3, the surface of the tapered roller 4, and the surface of the cage 5, and the release agent or grease is applied. A film is formed.

  Next, the tapered roller bearing is placed at a predetermined position of the lower mold, and the upper mold is aligned with this and set.

  Next, the lubricant-containing polymer 6 is pressure-fed into a hopper of an injection molding machine (not shown), and the one heated to a melting point or higher is pressed with a screw. A lubricant-containing polymer 6 is injected into a space formed by the rollers 4 and the cage 5. At this time, like the upper jig 12, a gap 8 is formed in the upper die between the cage 5 and the recess 33 and between the end face 2 </ b> B of the inner ring 2 and the recess 31. Therefore, the lubricant-containing polymer 6 is also injected into the gap 8. Similarly, a gap 7 is formed in the lower mold, and the lubricant-containing polymer 6 is also injected therein. The injected lubricant-containing polymer 6 is cooled and solidified within the mold so as to approach the mold temperature.

  Thereafter, the tapered roller bearing was taken out of the jig and subjected to a desired finishing process as required, whereby a lubricant-containing polymer-filled rolling bearing 1 was obtained.

  The lubricant-containing polymer-filled rolling bearing 1 manufactured by using this injection molding also rotated smoothly at a low torque and exhibited good lubricity.

  In addition, when manufacturing the lubricant containing polymer filling rolling bearing which concerns on this invention using injection molding, it is more desirable to use the vertical molding machine by which a metal mold | die is arrange | positioned up and down.

It is sectional drawing which shows a part of lubricant containing polymer filling rolling bearing which concerns on this Embodiment. It is sectional drawing which shows a part of manufacturing process of the lubricant containing polymer filling rolling bearing which concerns on this Embodiment. FIG. 3 is a partially enlarged view of FIG. 2.

Explanation of symbols

1 Roller bearing filled with polymer containing lubricant 2 Inner ring 3 Outer ring 4 Tapered roller (rolling element)
5 Cage 6 Polymer containing lubricant 11 Lower jig 12 Upper jig

Claims (6)

An inner ring and an outer ring, a plurality of rolling elements interposed between the inner ring and the outer ring, and a retainer that holds the rolling element and protrudes outward from one end face of the inner ring or the outer ring. A lubricant-containing polymer-filled rolling bearing comprising a lubricant-containing polymer filled in a space formed by the inner ring, the outer ring, the rolling elements, and the cage,
The cage is a lubricant-containing polymer-filled rolling bearing covered with the lubricant-containing polymer.   2. The lubricant-containing polymer-filled rolling bearing according to claim 1, wherein a fluorine-based release agent is applied to an outer peripheral surface of the inner ring, an inner peripheral surface of the outer ring, a surface of the rolling element, and a surface of the cage.   Grease is applied to the outer peripheral surface of the inner ring, the inner peripheral surface of the outer ring, the surface of the rolling element, and the surface of the cage, a resin and a lubricant that form the lubricant-containing polymer, and the grease 2. The lubricant-containing polymer-filled rolling bearing according to claim 1, wherein is a combination with low compatibility.   The lubricant-containing polymer-filled rolling bearing according to claim 1, wherein the rolling element is a tapered roller. An inner ring and an outer ring, a plurality of rolling elements interposed between the inner ring and the outer ring, and a retainer that holds the rolling element and protrudes outward from one end face of the inner ring or the outer ring. And a lubricant-containing polymer-filled rolling bearing comprising a lubricant-containing polymer filled in a space formed by the inner ring, outer ring, rolling element and cage,
After assembling the rolling bearing, applying a release agent or grease to the outer peripheral surface of the inner ring, the inner peripheral surface of the outer ring, the surface of the rolling element, and the surface of the cage;
After applying the release agent or grease, a lower jig provided with a structure in which the end face of the wider inner ring is in contact and the end face of the outer ring having a smaller width and the cage are not in contact with each other; The rolling bearing is positioned between the end face having a wider width of the outer ring and the upper jig having a structure in which the end face having a smaller width of the inner ring is not in contact with the cage, Solidifying the lubricant-containing polymer filled in the space formed by the inner ring, outer ring, rolling element and cage;
Of a lubricant-filled polymer-filled rolling bearing comprising:   The lower jig has a gap of 0.1 to 0.5 mm between the outer ring and an end surface of the outer ring, and a gap of 0.5 to 2 mm between the cage and the upper jig. The manufacturing method according to claim 5 which has a gap of 0.5-2 mm between said holder and 0.1-0.5 mm.

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