JP2001317557A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing with a lubricant supplying member having low torque, suppressing a rise in temperature, and capable of being used under high-speed rotation. SOLUTION: This deep groove ball bearing 11 comprises an inner ring 12; an outer ring 13; a plurality of balls 14 arranged between the inner ring 12 and the outer ring 13 so as to freely roll; and a lubricant supplying member 17 arranged in a clearance part 16 externally provided with the balls 14 and formed between the inner ring 12 and the outer ring 13, and made of lubricant containing polymer. In the deep groove ball bearing 11, the lubricant supplying member 17 is fixed on an outer diametrical surface of the inner ring 12 or an inner diametrical surface of the outer ring 13, and a portion exposed to the clearance part 16 of the balls 14 is partially contacted with the lubricant supplying member 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing provided with a lubricant supply member for supplying a lubricant to a portion to be lubricated, in a gap formed between an inner ring and an outer ring and provided with a rolling element. .

[0002]

2. Description of the Related Art Japanese Patent Publication No. Sho 62-60565 (Japanese Patent No. 143276) discloses a ball bearing in which a lubricant-containing polymer is used as a lubricant instead of grease and is disposed in the gap. That is, as shown in FIG. 5, the ball bearing 1 includes an inner ring 2, an outer ring 3, a plurality of balls 4 rotatably disposed between the two wheels 2, 3, and the two wheels 2, 3. A retainer 5 for holding a plurality of balls 4 therebetween, and a lubricant-containing polymer 7 disposed between the two wheels 2 and 3 and disposed in a gap 6 in which the balls 4 are provided. ing.

[0003] The lubricant-containing polymer 7 is filled in the cavity 6 so as to surround the entire portion of the surface of the ball 4 and the retainer 5 exposed in the cavity 6. Then, the lubricant oozing out from the lubricant-containing polymer 7 is supplied to the balls 4 to perform lubrication.

[0004]

However, the rolling bearings provided with the above-mentioned conventional lubricant-containing polymer have the following problems. (1) Since the lubricant-containing polymer 7 is filled so as to surround the ball 4, the lubricant-containing polymer 7 is filled with the respective members (the inner ring 2,
The movement of the outer ring 3, ball 4) is obstructed. As a result, the dynamic torque of the rolling bearing increases, and the temperature rise due to rotation also increases. Further, when the ball bearing 1 is rotated at a high speed, the lubricant-containing polymer 7 is softened by a rise in temperature, and may be damaged.

(2) When arranging the lubricant-containing polymer 7 (plastic grease) in the gap 6, the unfired grease-like plastic grease is first filled in the gap 6, and then the lubricant-containing polymer 7 is added. The sintering process is performed at a temperature equal to or higher than the melting point of a thermoplastic resin such as polyethylene, which forms the polymer 7, and then cooled. However, at this time, since the ball bearing 1 is also heated, the ball bearing 1 may be thermally deformed depending on the heating time and the heating temperature.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the conventional rolling bearing and to provide a rolling bearing which can be used even at a high speed with a low torque and a small temperature rise.

[0007]

In order to solve the above-mentioned problems, the present invention has the following arrangement. That is, the rolling bearing of the present invention comprises an inner ring, an outer ring, a plurality of rolling elements rotatably disposed between the inner ring and the outer ring, and the rolling element formed between the inner ring and the outer ring. A lubricant supply member made of a lubricant-containing polymer disposed in a gap portion in which the moving body is provided, wherein the lubricant supply member is provided with an outer diameter surface of the inner ring or an inner diameter surface of the outer ring. And the lubricant supply member is brought into contact with a part of a portion of the rolling element exposed in the gap.

[0008] With such a configuration, the lubricant supply member is in contact with only a part of the portion of the rolling element exposed in the gap, and thus hinders the rolling of the rolling element. Hateful. Further, since the lubricant supply member is fixed to one of the outer diameter surface of the inner ring and the inner diameter surface of the outer ring, the movement of the inner ring and the outer ring is not hindered. Therefore, the dynamic torque of the rolling bearing is low, and the temperature rise due to rotation is small, so that the rolling bearing can be used at high speed rotation.

Next, the lubricant-containing polymer in the present invention will be described. The raw material resin used for the lubricant-containing polymer is most preferably a polyolefin resin such as polyethylene, polypropylene, polybutylene, and polymethylpentene, and these resins may be used alone or as a mixture of two or more. A lubricant-containing polymer is obtained by mixing a lubricant with the above-mentioned raw material resin, heating and plasticizing the raw material resin at a temperature equal to or higher than the melting point of the raw material resin, and then cooling and solidifying.

However, resins other than polyolefin resins can be used as long as they are excellent in the ability to contain a lubricant (hereinafter referred to as oil retention). When heat resistance is required for such a resin, for example,
Examples include thermoplastic elastomers that can be injection molded, such as polyester elastomers, and thermosetting resins such as polyurethane and polyurea elastomers. A polyester elastomer or the like is preferable because the oil content can be increased.

In the case of polyurethane, a urethane prepolymer having an isocyanate group, which is a reaction raw material, and an amine-based curing agent are uniformly mixed with grease, which is a lubricant, and the two mixtures are mixed to obtain the desired mixture. Insert into a shaped mold. By heating and reacting as necessary, the resin is cured in a state containing grease to obtain a lubricant-containing polymer.

In the case of a polyurea elastomer,
An amine component consisting of a mixture of an aromatic polyamine compound having a soft segment in the molecular chain and an aromatic diamine is uniformly mixed with a lubricating oil compatible therewith or a grease having the lubricating oil as a base oil, Then, a polyisocyanate component is added and charged into a mold having a desired shape. By heating and reacting as needed, the resin is cured in a state containing a lubricant, thereby obtaining a lubricant-containing polymer.

[0013] Lubricants preferably used in the lubricant-containing polymer include paraffinic hydrocarbon oils such as poly-α-olefin oils, naphthenic hydrocarbon oils, mineral oils, and the like.
Examples thereof include ether oils such as dialkyldiphenyl ether, and ester oils such as phthalic acid esters, and these can be used alone or as a mixture of two or more. Such lubricants include antioxidants, rust inhibitors, antiwear agents,
Various additives such as a defoaming agent and an extreme pressure agent may be added for use.

The composition ratio of the raw material resin and the lubricant in the lubricant-containing polymer is preferably 10 to 50% by weight of the raw material resin and 90 to 50% by weight of the lubricant. When the amount of the raw material resin is less than 10% by weight, sufficient hardness, strength, and the like cannot be given to the lubricant-containing polymer, and the contact portion with the rolling element is easily deformed due to rotation of the rolling bearing. The possibility of causing a defect is increased. Further, when the raw material resin exceeds 50% by weight, the content of the lubricant decreases,
Since it becomes difficult to continuously supply the lubricant to the lubricated portion for a long period of time, the life of the rolling bearing is shortened.

Further, resins generally have various average molecular weights (having the same basic structure), and their physical properties may differ depending on the average molecular weight. Therefore, a raw material resin having desired physical properties can be adjusted by mixing resins having various average molecular weights as needed. For example, in the case of a polyolefin resin, the average molecular weight is 700 to 1 × 10
⁴ (for example, polyethylene wax), those having a relatively low molecular weight of 1 × 10 ⁴ to 1 × 10 ⁶ , and those having an average molecular weight of 1 × 10 ^{6 to} 5 × 1
0 and those of ultra-high molecular weight of ^6, there is.

The combination of a lubricant having a relatively low molecular weight and a lubricant provides a lubricant-containing polymer having a certain level of mechanical strength, lubricant supply capacity, and oil retention. Replacing some of the relatively low-molecular-weight substances in this category with those classified as wax increases the affinity for lubricants due to the small difference in molecular weight between those classified as wax and lubricants. As a result, the oil retention of the lubricant-containing polymer is improved,
The lubricant can be supplied for a longer period. However, on the other hand, the mechanical strength tends to decrease. As the wax, hydrocarbon wax having a melting point in the range of 100 to 130 ° C. or more (for example, paraffin-based synthetic wax) can be used in addition to polyolefin resin such as polyethylene wax.

On the other hand, when a part of a relatively low molecular weight compound is replaced with an ultra high molecular weight compound, the difference in molecular weight between the ultra high molecular weight compound and the lubricant is large. It tends to lower the oil retention as a result. As a result, the speed at which the lubricant oozes out of the lubricant-containing polymer is increased, that is, the time until all the lubricant oozes out of the lubricant-containing polymer is shortened, and the life of the rolling bearing is shortened. However, the mechanical strength is improved.

Taking into account the balance among moldability, mechanical strength, oil retention, and lubricant supply, the composition ratio of the lubricant-containing polymer is 0 to 5% by weight for waxes and relatively low molecular weight. 8 to 48% by weight, ultrahigh molecular weight 2 to 15% by weight, and the total of the three types is 10 to 50% by weight.
(The remainder is a lubricant). The lubricant-containing polymer of the present invention preferably has a hardness [HD _A ], which is one measure of mechanical strength, in the range of 65 to 90. If the hardness [HD _A ] is less than 65, the strength is not sufficient and the lubricant-containing polymer may be damaged by rotation of the rolling bearing. On the other hand, when the hardness [HD _A ] exceeds 90, the mechanical effect on the contacting rolling elements increases, whereby the dynamic torque of the rolling bearings increases, and the heat generated by the rotation of the rolling bearings increases. As a result, the temperature of the rolling bearing may increase.
In order to make such a problem less likely to occur, the hardness [HD _A ] is more preferably in the range of 70 to 85.

In the rolling bearing provided with the lubricant supply member of the present invention, the lubricant supply member may be constituted by a lubricant-containing polymer to which various additives are added within a range not impairing the object of the present invention. . For example, in order to improve the mechanical strength of the lubricant-containing polymer,
The following thermoplastic resin or thermosetting resin may be added.

Examples of the thermoplastic resin include polyamide resin, polycarbonate resin, polybutylene terephthalate resin, polyphenylene sulfide resin, polyether sulfone resin, polyether ether ketone resin, polyamide imide resin, polystyrene resin and ABS.
Resins. As a thermosetting resin, for example,
Examples include unsaturated polyester resin, urea resin, melamine resin, phenol resin, polyimide resin, epoxy resin and the like.

These thermoplastic resins and thermosetting resins may be used alone or as a mixture of two or more. further,
If necessary, an appropriate compatibilizer may be added in order to disperse the raw resin such as the polyolefin resin and the other resin in a more uniform state. Further, a filler may be added to improve the mechanical strength. For example, inorganic whiskers such as calcium carbonate, magnesium carbonate, potassium titanate whiskers, and aluminum borate whiskers, inorganic fibers such as glass fibers and metal fibers, and woven fabrics of these, carbon black, graphite powder, carbon Fiber, aramid fiber, polyester fiber and the like. In particular, the addition of graphite powder is preferable because the thermal conductivity of the lubricant-containing polymer is improved and the friction coefficient is reduced.

Further, for the purpose of preventing deterioration of the starting resin such as polyolefin resin due to heat, N, N'-diphenyl-p-phenylenediamine, 2,2'-methylenebis (4-ethyl-6-t-butylphenol) are used. ) And the like, and for the purpose of preventing deterioration due to light, 2-hydroxy-4-n-octoxybenzophenone, 2- (2′-hydroxy-3′-t-butyl-).
An ultraviolet absorber such as 5′-methylphenyl) -5-chlorobenzotriazole may be added.

The addition amount of all the above additives (other than the raw material resin and the lubricant) is preferably not more than 20% by weight in order to maintain the lubricant supply capacity of the lubricant supply member. .

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rolling bearing according to the present invention will be described with reference to the drawings. (First Embodiment) FIG. 1 is a sectional view of a deep groove ball bearing 11 provided with a lubricant supply member 17. This deep groove ball bearing 1
1 (call number: 6005) includes an inner ring 12 and an outer ring 13
And a plurality of balls 14 arranged so as to be able to roll between the two wheels 12 and 13 and a synthetic resin holding the plurality of balls 14 between the two wheels 12 and 13 (for example, 15% by weight of glass fiber). % Of polyamide 6,6 resin).
And a lubricant supply member 17 made of a lubricant-containing polymer and disposed in a space 16 in which the ball 14 is formed between the two wheels 12 and 13.

The crown-shaped retainer 15 has a structure in which a plurality of balls 15b for holding the balls 14 are provided on one side in the axial direction of the annular portion 15a, but in FIG. Is disposed in the ball bearing 11 with the annular portion 15a facing the other. Therefore, the ball 14 has its left portion surrounded by the crown-shaped retainer 15 and its right portion exposed.

The lubricant supply member 17 has a ring shape,
A seal groove 1 whose outer edge is provided on the inner diameter surface of the outer ring 13.
The outer ring 13 is attached to the right end of the outer ring 13 by press-fitting the outer ring 3a. Also, a ring-shaped lubricant supply member 1
The inner edge of 7 is in contact with the outer diameter surface of the inner race 12, and the lubricant supply member 17 also serves as a seal. The lubricant supply member 17 is in point contact with the exposed portion on the right side of the ball 14, and the lubricant oozes out of the lubricant supply member 17 by the rotation of the ball bearing 11, and the ball bearing 11 (track surface, rolling surface, etc.).

A shield 18 is attached to the inner surface of the left end of the outer ring 13. In addition, this shield 1
8 may be a contact or non-contact seal. Inner ring 12
When the inner ring rotates, the lubricant supply member 17 does not rotate. Also, the lubricant supply member 17 is
Since the lubricant supply member 17 expands due to a rise in temperature, the lubricant supply member 17 does not protrude outside the side surface because the lubricant supply member 17 is mounted inside the side surface of the outer ring 13 and the outer ring 13.

Examples of the lubricant-containing polymer constituting the lubricant supply member 17 include those having the following composition. That is, the composition of the lubricant-containing polymer is 12.5 ultrahigh molecular weight polyethylene (the above ultrahigh molecular weight).
% By weight, 10% by weight of high-density polyethylene (the one having the relatively low molecular weight), 2.5% by weight of polyethylene wax (classified as the wax), and 75% by weight of mineral oil.

Then, these were once plasticized (melted) by using an injection molding machine, then injected into a predetermined mold, cooled while being pressurized, and a ring-shaped lubricant supply member 17 was formed. As described above, since the lubricant supply member 17 is manufactured (molded) separately from the bearing and incorporated into the bearing, the rolling bearing is also heated together when the lubricant-containing polymer is subjected to the firing treatment as in the above-described conventional example. Thus, the rolling bearing does not cause a problem such as thermal deformation. Further, the method of molding such a lubricant supply member 17 by an injection molding method includes a method of filling a lubricant-containing polymer into a cavity of a rolling bearing by injection (insert molding (injection) using a rolling bearing as a core). Compared with this, it can be manufactured in a short time and at low cost.

(Second Embodiment) FIG. 2 is a sectional view of a deep groove ball bearing 21 provided with a lubricant supply member 17. In addition,
Since the configuration of the deep groove ball bearing 21 (call number: 6005) in FIG. 2 is substantially the same as the configuration of the deep groove ball bearing 11 shown in FIG. 1, the description of the same parts will be omitted, and only the different parts will be described. I do. In FIG. 2, the same or corresponding parts as those in FIG. 1 are denoted by the same reference numerals as those in FIG.

A ring-shaped lubricant supply member 17 is formed by insert-molding a lubricant-containing polymer 23 (for example, the same as that of the first embodiment) using a flat ring-shaped steel plate (or resin) as a core material 22. Manufactured. The core material 22 has a constant P
Since a plurality of through holes 24 are provided evenly at the position of the CD,
The lubricant-containing polymer 23 is inserted into the through-hole 24 during insert molding.
Then, the core material 22 and the lubricant-containing polymer 23 are integrated. Core material 2 protruding from lubricant-containing polymer 23
The lubricant supply member 17 as described above is attached to the right end of the outer race 13 by press-fitting the outer edge of the outer race 13 into a seal groove 13 a provided on the inner diameter surface of the outer race 13. Further, the inner edge of the ring-shaped lubricant supply member 17 is in contact with the outer diameter surface of the inner race 12, and the lubricant supply member 17 also plays a role of a seal.

The lubricant supply member 17 is in contact with the exposed portion on the right side of the ball 14, and the lubricant seeps out of the lubricant supply member 17 by the rotation of the ball bearing 21.
Inside of the ball bearing 21 via the ball 14 (track surface, rolling surface, etc.)
It is supplied to. The contact portion of the lubricant supply member 17 with the ball 14 is a spherical concave surface 17a having the same curvature as the ball 14, and the contact area with the ball 14 is larger than in the first embodiment. I have.

(Third Embodiment) FIG. 3 shows a thrust angular contact ball bearing 31 for a ball screw support (contact angle is 60).
FIG. Such a thrust angular contact ball bearing 31 is often used as a combination bearing in which a plurality of the thrust angular contact ball bearings 31 are arranged, and the lubricant supply member 17 also serves as a seal, and out of the plurality of void portions 16 of the combination bearing. It is attached to the outermost (two locations).

Of such combination bearings, the two-row combination DF (front combination), the three-row combination DFD, the four-row combination DFF, the DFT, etc., have the back surfaces of the bearings disposed at both ends (outside). Since the lubricant supply member 17 is mounted on the back side, its configuration will be described below. In addition,
3, only one thrust angular ball bearing 31 is shown instead of the combination bearing, and the same or corresponding parts as those in FIG. 1 are denoted by the same reference numerals as those in FIG.

The thrust angular contact ball bearing 31 includes an inner ring 12, an outer ring 13, a plurality of balls 14 which are rotatably disposed between the two rings 12, 13, and a plurality of balls 14 between the two rings 12, 13. And a crown-shaped retainer 15 made of a synthetic resin (for example, made of a polyamide 6,6 resin containing 15% by weight of glass fiber) holding the ball 14, and the ball 14 formed between the two wheels 12, 13 is provided inside. And a lubricant supply member 17 made of a lubricant-containing polymer disposed in the formed gap 16.

The crown-shaped cage 15 has a structure in which a plurality of balls 15b for holding the balls 14 are provided on one side in the axial direction of the annular portion 15a, but in FIG. Is arranged in the ball bearing 31 with the annular portion 15a facing the other. Therefore, the ball 14 is surrounded on its right side by the crown-shaped retainer 15, and its left side is exposed.

The lubricant supply member 17 has a ring shape,
A seal groove 1 whose outer edge is provided on the inner diameter surface of the outer ring 13.
The outer ring 13 is attached to the left end of the outer ring 13 by press-fitting the outer ring 3a. Also, a ring-shaped lubricant supply member 1
The inner edge of 7 is in contact with the outer diameter surface of the inner ring 12, and the lubricant supply member 17 also serves as a seal. The lubricant supply member 17 is in contact with the left exposed portion of the ball 14, and the lubricant oozes out of the lubricant supply member 17 by the rotation of the ball bearing 31, and the ball bearing 3
1 (track surface, rolling surface, etc.). The contact portion of the lubricant supply member 17 with the ball 14 is a spherical concave surface 17 a having the same curvature as the ball 14.

In the case of inner ring rotation in which the inner ring 12 rotates, the lubricant supply member 17 does not rotate. Further, since the lubricant supply member 17 is mounted inside the side surfaces of the inner ring 12 and the outer ring 13, even if the lubricant supply member 17 expands due to a temperature rise, it does not protrude outside the side surfaces. Examples of the lubricant-containing polymer constituting the lubricant supply member 17 include those having the following composition in addition to those used in the first embodiment. That is, the composition of the lubricant-containing polymer is 39% by weight of a polyester elastomer, 53% by weight of tri-2-ethylhexyl trimellitate (trioctyl trimellitate), 4% by weight of alkyl diphenyl ether, 1% by weight of polycarbodiimide, and pentaerythri. Lityl-tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] 1% by weight and graphite powder 2% by weight.

Incidentally, tri-2-ethylhexyl trimellitate is a lubricant having high compatibility with the polyester elastomer. However, when heated above the melting point of the polyester elastomer, it is necessary that the compatibility with the polyester elastomer be high. Here "high compatibility"
This is a state in which a lubricant with a very large weight ratio of about 1: 1 is completely compatible at a temperature higher than the melting point, and is uniformly integrated without being separated into two layers even after cooling and solidification. is there. Other lubricants that are highly compatible with polyester elastomers include polyphenyl ether oils such as tetraphenyl ether and pentaphenyl ether, dioctyl sebacate, dioctyl phthalate, trioctyl trimellitate, triisodecyl trimellitate, There are ester oils such as octyl pyromellitate, pentaerythritol tetraester and dipentaerythritol hexaester, and polyalkylene glycol oils. Among them, those having a phenyl group in the structure are more preferable because they have higher compatibility.

The alkyl diphenyl ether is a lubricant having low compatibility with the polyester elastomer. Examples of the alkyl diphenyl ether include those having a long alkyl chain such as octadecyl phenyl ether. In addition, you may use a small polarity lubricant, such as poly (alpha) -olefin oil and mineral oil, instead of alkyl diphenyl ether.

Polycarbodiimide is a hydrolysis-resistant stabilizer. During molding or in an environment where a large amount of water is present, the polyester elastomer hydrolyzes the ester groups in the resin by water or the like and is cleaved, resulting in a decrease in molecular weight and a decrease in mechanical strength. It is also conceivable that a carboxyl group derived from a polyester raw material and a carboxyl group generated by hydrolysis act as an acid catalyst to promote hydrolysis. Polycarbodiimide having a carbodiimide group in its molecular structure is formed by reacting with a carboxyl group to form a carbamoylamide, thereby deactivating the catalytic ability to promote the hydrolysis of the carboxyl group, and by the hydrolysis of an ester group. And a second function of linking molecules cut by a cross-linking reaction with a carboxyl group in the polyester-based elastomer. Therefore, even when the polyester-based elastomer is used in an environment where a large amount of water is present, hydrolysis of the polyester-based elastomer is suppressed, and the initial mechanical strength is maintained.

Further, pentaerythrityl-tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] is an antioxidant, and such a hindered phenol-based compound is heat-resistant. It is preferable because it has an excellent effect on oxidation resistance. Then, these were once plasticized (melted) using an injection molding machine, then injected into a predetermined mold, cooled while being pressurized, and a ring-shaped lubricant supply member 17 was formed. As described above, since the lubricant supply member 17 is manufactured (molded) separately from the bearing and incorporated into the bearing, the lubricant-containing polymer is fired as in the above-described conventional example, as in the first embodiment. During processing, the rolling bearings are also heated, so that the rolling bearings do not cause problems such as thermal deformation. Further, the method of molding such a lubricant supply member 17 by an injection molding method includes a method of filling a lubricant-containing polymer into a cavity of a rolling bearing by injection (insert molding (injection) using a rolling bearing as a core). Compared with this, it can be manufactured in a short time and at low cost.

(Fourth Embodiment) FIG. 4 shows a thrust angular ball bearing 41 for a ball screw support (contact angle is 60).
FIG. This thrust angular contact ball bearing 4
1 is a case where the combination bearing is a two-row combination DB (rear combination) or the like, and the front surface of the bearing is arranged at both ends (outside). Therefore, the lubricant supply member 17 also serving as a seal is mounted on the front side. The other configuration is the same as the configuration of the thrust angular contact ball bearing 31 shown in FIG.

That is, in FIG. 4, the crown type retainer 15 is disposed in the ball bearing 41 with the one side 15b facing the right side and the annular portion 15a facing the left side. Therefore, ball 1
4 has its left part surrounded by a crown-shaped retainer 15, and its right part is exposed. The ring-shaped lubricant supply member 17 is attached to the right end of the outer ring 13 and is in contact with the right exposed portion of the ball 14.

In FIG. 4, only one thrust angular ball bearing 41 is shown instead of the combination bearing, and the same or corresponding parts as those in FIG. 1 are denoted by the same reference numerals as those in FIG. When the combination bearing is other than the above, that is, DT (parallel combination) of two-row combination, D of three-row combination
In the case of TD or the like, the front and back surfaces of the bearing are respectively arranged one at each end (outside), so that the third and fourth embodiments may be applied in combination.

In the first to fourth embodiments, the crown type cage 15 is made of polyamide 6,6 resin containing 15% by weight of glass fiber, but other types of polyamide resin, polyether Ether ketone resin such as ether ketone resin (PEEK), polyoxymethylene resin (PO
M), other types of synthetic resins such as polybutylene terephthalate resin (PBT) and linear polyphenylene sulfide resin (L-PPS). Further, it may be made of metal such as steel.

The type of fibers contained in the resin is not particularly limited as long as it provides sufficient strength to the cage. Other than glass fibers, carbon fibers, aramid fibers, various whiskers, and the like can be used. Often used. further,
The content of the fiber is appropriately selected in consideration of moldability, assemblability, and the like, in addition to the strength of the cage. Usually 5 to 40% by weight
It is about.

Further, the type of the retainer is not limited to the crown type retainer, but may be, for example, a cage retainer, a single retainer, or a waveform retainer. Furthermore, the rolling bearing of the present invention is not limited to a deep groove ball bearing or a thrust angular ball bearing as in the present embodiment, but other types of ball bearings such as a radial angular ball bearing, and various roller bearings It is possible to apply to.

Next, results of various tests performed on the rolling bearings described in the first to fourth embodiments will be described. First, the results of evaluating the dynamic torque and the degree of temperature rise for the deep groove ball bearings 11 and 21 of the first and second embodiments will be described. Deep groove ball bearings 11 and 12
1, the rotation speed is 1000 rpm, the load is Fr98N, Fa9.
The rotor was rotated under the conditions of 8N, and the dynamic torque and the temperature of the outer ring (degree of increase from room temperature) at that time were measured.

As Comparative Example 1, a deep groove ball bearing 61 (call number: 6005) as shown in FIG. 6 was used. That is, in the deep groove ball bearing 61, the lubricant supply member 17 is formed by the gap portion 1 on the surface of the ball 14 and the crown type cage 15.
The gaps 16 inside the shields 18 provided at both ends of the outer ring 13 so as to surround the entire portion exposed in the inner ring 6.
The other configuration is a deep groove ball bearing 1
Same as 1,21. In FIG. 6, the same or corresponding parts as in FIG. 1 are denoted by the same reference numerals as in FIG.

In each of the three deep groove ball bearings 11, 21, 61, the lubricant-containing polymer used was the same as that used in the first embodiment, and the one obtained by injection molding was used. Table 1 shows the results. The numerical values in Table 1 are relative values with the test result of Comparative Example 1 being 1.

[0052]

[Table 1]

As can be seen from the results in Table 1, the deep groove ball bearings 11 and 21 of the first and second embodiments are superior in both the dynamic torque and the degree of temperature rise as compared with the deep groove ball bearing 61 of Comparative Example 1. I was Subsequently, the result of evaluating the dynamic torque and the degree of temperature rise of the thrust angular contact ball bearing 31 of the third embodiment in the same manner as described above will be described.

The thrust angular contact ball bearing 31 (call number: 20TAC47BDF) is rotated at a rotation speed of 1000 rpm.
m and a preload C10 (2156N), and the dynamic torque and the temperature of the outer ring (degree of rise from room temperature) at that time were measured. As Comparative Example 2, a thrust angular contact ball bearing 71 (nominal number: 20TAC4) as shown in FIG.
7BDF) was used. That is, in the thrust angular contact ball bearing 71, the lubricant supply member 17 is filled in the gap 16 so as to surround the entire portion of the surface of the ball 14 and the crown-shaped retainer 15 exposed in the gap 16. Yes,
Other configurations are the same as those of the thrust angular contact ball bearing 31. In FIG. 7, parts that are the same as or correspond to those in FIG. 1 are given the same reference numerals as in FIG.

Two thrust angular contact ball bearings 31, 7
In any one of the examples, the lubricant-containing polymer used was the one used in the first embodiment, and the one obtained by injection molding was used. Table 2 shows the results. Table 2
Are relative values with the test result of Comparative Example 2 being 1.

[0056]

[Table 2]

As can be seen from the results in Table 2, the thrust angular contact ball bearing 31 of the third embodiment was superior to the thrust angular contact ball bearing 71 of Comparative Example 2 in both dynamic torque and temperature rise. Further, the thrust angular contact ball bearing 31 has a larger number of balls than the deep groove ball bearings 11 and 21, and thus has a greater effect on dynamic torque and temperature rise.

[0058]

As described above, the rolling bearing of the present invention has the following features.
Since it is possible to minimize the lubricant supply member from restricting the rotation of the inner ring, the outer ring, and the rolling elements, the torque rise is small and the temperature rise is small. Therefore, it can be used even at high speed rotation.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a deep groove ball bearing showing a first embodiment of a rolling bearing of the present invention.

FIG. 2 is a longitudinal sectional view of a deep groove ball bearing showing a second embodiment of the rolling bearing of the present invention.

FIG. 3 is a longitudinal sectional view of a thrust angular contact ball bearing showing a third embodiment of the rolling bearing of the present invention.

FIG. 4 is a longitudinal sectional view of a thrust angular contact ball bearing showing a fourth embodiment of the rolling bearing of the present invention.

FIG. 5 is a partial vertical sectional view of a ball bearing provided with a conventional lubricant-containing polymer.

6 is a longitudinal sectional view of a deep groove ball bearing of Comparative Example 1. FIG.

FIG. 7 is a longitudinal sectional view of a thrust angular contact ball bearing of Comparative Example 2.

[Explanation of symbols]

 11, 21 Deep groove ball bearings 31, 41 Thrust angular contact ball bearings 12 Inner ring 13 Outer ring 14 Ball 15 Crown type retainer 16 Void portion 17 Lubricant supply member

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) C10M 107/02 C10M 107/02 143/00 143/00 145/22 145/22 149/18 149/18 149 / 20 149/20 // C10N 40:02 C10N 40:02 F term (reference) 3J101 AA02 AA32 AA42 AA52 AA54 AA62 CA01 CA11 FA32 4H104 BA02A BA07A BB08A BB33A CA01C CB13C CE13C CE14C DA02A PA01 RA03

Claims (1)

[Claims] 1. An inner ring, an outer ring, a plurality of rolling elements rotatably disposed between the inner ring and the outer ring, and an inner ring formed between the inner ring and the outer ring. And a lubricant supply member made of a lubricant-containing polymer disposed in the provided gap portion, wherein the lubricant supply member is fixed to the outer diameter surface of the inner ring or the inner diameter surface of the outer ring. A rolling bearing, wherein the lubricant supply member is brought into contact with a part of a portion of the rolling element exposed in the gap.