JP2655091B2 - Roller bearing cage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cage for a rolling bearing, and more particularly to a cage for a high-temperature rolling bearing used in a high-temperature machine such as a jet engine, a ceramic gas turbine, or a heat treatment furnace.

[0002]

2. Description of the Related Art Lubricants and lubrication methods become a major problem when using rolling bearings at high temperatures exceeding 370 ° C. in the atmosphere and other high-temperature machines having rotating parts and sliding parts. As a lubricant, a liquid lubricant cannot be used, and a solid lubricant must be used. Known solid lubricants include eutectics of CaF2 and BaF2, mixtures of BaF2, mixtures of BaF2 and Cr2O3, and mixtures of these with binders.

[0003]

The rolling bearing has a plurality of rolling elements such as balls or rollers disposed between an inner ring and an outer ring, and these rolling elements are held by a retainer. In applying a solid lubricant to such a rolling bearing, a film of the solid lubricant is formed on the pocket surface of the cage, and the rolling elements are arranged in the pocket provided with such a film. As a result of the rolling element slidingly contacting both the cage and the inner ring or the outer ring, the rolling element transfers solid lubricant from the cage to the raceway surface of the inner or outer ring, and the solid lubricant is also applied to the raceway surface of the inner or outer ring. The bearing is lubricated by forming the coating.

Various techniques have been devised for forming a solid lubricant film on the pocket surface of the cage.
Recently, a thermal spraying technique has been proposed as a promising method. In the thermal spraying method, a powder of a solid lubricant is supplied into plasma of a thermal spray gun, and thermal spraying is performed on a pocket surface of a retainer. However, the pocket surface of the conventional cage forms a part of a cylindrical surface or a spherical surface according to the shape of the rolling element housed therein, and the nozzle of the thermal spraying device for spraying the solid lubricant on the pocket surface is provided with the nozzle of the pocket surface. Since the angle formed by the pocket surface and the spray nozzle differs depending on the position, the solid lubricant cannot be sprayed on the pocket surface, and the thickness of the solid lubricant film on each part of the pocket surface becomes uneven. is there. It is also conceivable to scan the spray gun nozzle along the entire surface of the cage pocket surface in order to obtain a solid lubricant film of uniform thickness over the entire pocket surface consisting of curved surfaces. However, the mechanism becomes considerably complicated, and the apparatus becomes large, which is not preferable.

[0005] If a solid lubricant film having a required thickness cannot be formed on the pocket surface of the cage, the transfer of the solid lubricant from the cage to the inner ring or the outer ring cannot be performed reliably. Therefore, there is a demand for the development of a technology that ensures formation of a solid lubricant film, that is uniform, and that is easy to implement.
The present invention has been made in view of the circumstances described above, and it is possible to easily and reliably transfer a solid lubricant from a pocket surface of a retainer to a raceway surface of an inner ring or an outer ring, and to obtain a necessary film thickness. An object of the present invention is to provide a roller bearing retainer which can reliably form a solid lubricant film on a necessary surface of a pocket surface, and can be easily implemented without requiring a large-scale device. It is.

[0006]

SUMMARY OF THE INVENTION In accordance with this object, a cage for a rolling bearing according to the present invention has a flat surface at least a part of a pocket surface of the cage with which a rolling member comes into sliding contact. It is characterized in that a solid lubricant is attached to a flat surface.

[0007]

In the pocket surface of the cage, the surface that comes into sliding contact with the rolling member is formed of a flat surface, and this flat surface can be positioned so as to face the thermal spray gun.
Even if the spraying gun is not moved, the angle between the plane and the spraying gun can be kept substantially constant, so that a uniform solid lubricant film can be formed on the entire surface of the plane. In particular, if the plane can be positioned at a right angle to the spray gun, adhesion of the molten solid lubricant is good.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings showing one embodiment. In FIG. 1, reference numeral 1 denotes a rolling bearing. The rolling bearing 1 includes a rolling member 4 between the inner ring 2 and the outer ring 3. In the embodiment shown in FIG. 1, the rolling member 4 is a sphere and is held by a holder 10. As shown in FIG. 2, the retainer 10 includes two retaining members 5a and 5b that are joined adjacently in the axial direction. As shown in FIGS. 3 and 4, the retainer member 5a is formed with a plurality of pocket grooves 6a that are trapezoidal in a front view at intervals in the circumferential direction. The pocket groove 6a has three planes,
That is, it has a top surface 7, a side surface 8, and a side surface 9. The top surface 7, the side surface 8 and the side surface 9 are flat. The portion corresponding to the bottom of the pocket groove 6a is open. On the other hand, the cage member 5b is also provided with a plurality of trapezoidal pocket grooves 6b at circumferential intervals.
Are formed. The pocket groove 6b has three planes, that is, a top surface 11, a side surface 12, and a side surface 13. Top 1
1, the side surface 12 and the side surface 13 are flat surfaces. The portion corresponding to the trapezoidal bottom of the pocket groove 6b is open. Surfaces 7 of pocket grooves 6a, 6b of retainer members 5a, 5b,
8, 9 and 11, 12, and 13, a solid lubricant film 14 is formed as shown in FIG.
5b together form the retainer 5, and the pocket grooves 6a, 6b together form the pocket hole 15. The rolling member 4 is housed in the pocket hole 15.

As shown in FIGS. 8 and 9, the retainer member 5a
Or 5b is made of heat-resistant steel and has pocket grooves 5a, 5b.
b can be processed by the end mill 16. When a solid lubricant film is formed on the inner surface of the pocket groove, the solid lubricant in a molten state is sprayed onto the surfaces of the pocket grooves 6a and 6b by the thermal spray gun 17 as shown in FIG. Since the angle between each surface of the grooves 6a and 6b and the spray gun 17 can be set to a predetermined angle, for example, about 90 ° by a jig, the solid lubricant in the molten state is used for the pocket. As a result of being sprayed at right angles to the surfaces of the grooves, the adhesion of the solid lubricant to the surfaces of the pocket grooves 6a, 6b is extremely good.

As described above, the surfaces of the pocket grooves of the retainer members 5a and 5b are formed of a plurality of flat surfaces, and the respective pocket grooves are formed depending on how the retainer members 5a and 5b are set in the thermal spraying device. As a result, the solid lubricant can be sprayed on the surface of the pocket groove satisfactorily, and the surface of the pocket groove has a small thickness. A large solid lubricant film is formed. The two retainer members 5a and 5b on which the solid lubricant film is formed are fixed to face each other, and the pocket grooves 6a and 6b together form the pocket hole 15. The rolling member 4 housed in the pocket hole 15 rotates while being in contact with both the inner surface of the pocket of the cage and the raceway surface of the inner ring 2 or the outer ring 3.
By this rotation, the solid lubricant film 14 is scraped off little by little and transferred to the raceway surface of the inner ring or the outer ring, and a lubrication film is formed on the raceway surface to perform lubrication.

FIG. 11 shows a cage 10 according to another embodiment. The retainer 10 has a rectangular pocket hole 15 and comprises retainer members 5c and 5d. The retainer member 5c has a pocket groove 6c, and the pocket groove 6c has three planes, that is, top surfaces 2 that are perpendicular to each other.
1, a side surface 22 and a side surface 23. Top 21, side 2
2 and the side surface 23 are flat surfaces. Square pocket groove 6
The portion corresponding to the bottom of c is open. On the other hand, the retainer member 5d is in the shape of an annular plate, and the retainer member 5c and the retainer member 5d are fixed in the axial direction, and the retainer member 5d is located at the bottom of the pocket groove 6b of the retainer member 5c. The corresponding open part is closed. Thus, the cage member 5c and the cage member 5d cooperate to form the pocket hole 15 of the cage 10. A solid lubricant film is formed on the inner surface of the pocket hole 15, and each surface 21, 22, and 23 of the pocket groove 6c of the retainer member 5c is formed to form the solid lubricant film.
Is sprayed with a solid lubricant, and a member corresponding to the pocket groove 6c of the retainer member 5d is also sprayed with the solid lubricant.

As described above, the surface of the pocket groove 6c of the retainer member 5c and the surface of the portion of the retainer member 5d corresponding to the pocket groove 6c are constituted by a plurality of planes, and the method of setting the retainer member 5c to the thermal spraying device is performed. As a result, the surface of each pocket groove can spray the solid lubricant at a right angle or almost a right angle to the spray gun, so that the solid lubricant adheres well to the surface of the pocket groove, A thick solid lubricant film is formed on the surface of the groove. The two retainer members 5c and 5d on which the solid lubricant film is formed are fixed to face each other and cooperate to form the pocket hole 15.

FIG. 12 shows a retainer 10 of still another embodiment. The cage 10 has a pocket hole 15 in the shape of a rhombus, and the cage 10 is formed by joining two cage members 5e and 5f which are adjacently joined in the axial direction as shown in FIGS. Have. As shown in FIGS. 13 and 14, the retainer member 5e is formed with pocket grooves 6e that are triangular in a front view at intervals in the circumferential direction. The pocket groove 6e has two planes, that is, side surfaces 24 and 25, as shown in FIG. The side surfaces 24 and 25 are flat surfaces. The portion corresponding to the bottom of the pocket groove 6e is open. On the other hand, triangular pocket grooves 6f are also formed in the retainer member 5f at intervals in the circumferential direction. The pocket groove 6f has two planes, that is, the side surface 27 and the side surface 28.
Having. The side surfaces 27 and 28 are flat surfaces. The portion corresponding to the bottom of the triangle of the pocket groove 6f is open. As shown in FIG. 18, a solid lubricant film 14 is formed on the surfaces 24, 25 and 27, 28 of the pocket grooves 6e, 6f of the cage members 5e, 5f.
e and 5f together form the retainer 5, and at this time the pocket grooves 6e and 6f together form the pocket hole 15.
The rolling member 4 is housed in the pocket hole 15.

When a solid lubricant film is formed on the inner surface of the pocket groove, the solid lubricant in a molten state is sprayed onto the surfaces of the pocket grooves 6e and 6f by a spray gun. Each surface of 6f and the spray gun holder members 5e and 5f are fixed at a predetermined angle, for example, approximately 90
°, the solid lubricant in the molten state is sprayed at right angles to the surface of the pocket groove, so that the solid lubricant adheres extremely well to the surfaces of the pocket grooves 6e and 6f.

As described above, the surfaces of the pocket grooves of the retainer members 5e and 5f are formed of a plurality of planes, and the respective pocket grooves are formed depending on how the retainer members 5e and 5f are set in the thermal spraying device. As a result, the solid lubricant can be sprayed on the surface of the pocket groove well, and the solid lubricant can be applied to the surface of the pocket groove. A lubricant film is formed. The two retainer members 5e and 5f on which the solid lubricant film is formed are fixed to face each other, and the pocket grooves 6e and 6f cooperate to form the pocket hole 15. Rolling member 4 accommodated in pocket hole 15
Rotates while being in contact with both the inner surface of the cage pocket and the raceway surface of the inner race 2 or the outer race 3. By this rotation, the solid lubricant film 14 is scraped little by little and transferred to the raceway surface of the inner race or the outer race. Then, a lubricating film is formed on the raceway surface to perform lubrication.

[0016]

As described above, according to the present invention, the surface of the pocket groove of the retainer member is constituted by a plurality of planes.
Depending on how the retainer member is set in the thermal spraying device, the surface of each pocket groove can spray the solid lubricant at a right angle or almost a right angle to the spray gun. The solid lubricant film adheres well to the surface of the groove and a thick solid lubricant film can be formed on the surface of the pocket groove.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view of a rolling bearing.

FIG. 2 is an explanatory front view of the retainer.

FIG. 3 is an explanatory plan view of a retainer member.

FIG. 4 is an explanatory front view of a retainer member.

FIG. 5 is an explanatory plan view of a retainer member.

FIG. 6 is an explanatory front view of the retainer member.

FIG. 7 is an enlarged sectional explanatory view showing a pocket hole of the retainer.

FIG. 8 is an explanatory front view showing a molding state of the pocket groove of the retainer member.

FIG. 9 is an explanatory perspective view showing a molding state of the pocket groove of the retainer member.

FIG. 10 is an explanatory front view showing a sprayed state of the cage member with respect to the pocket groove.

FIG. 11 is an exploded perspective view of another cage.

FIG. 12 is an explanatory perspective view of another cage.

FIG. 13 is an explanatory front view of another cage.

FIG. 14 is an explanatory plan view of another retainer member.

FIG. 15 is an explanatory front view of another retainer member.

FIG. 16 is an explanatory plan view of another retainer member.

FIG. 17 is an explanatory front view of another retainer member.

FIG. 18 is a cross-sectional enlarged explanatory view showing a sprayed state of another cage member with respect to a pocket groove.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bearing 2 Inner ring 3 Outer ring 4 Rolling member 5a, 5c, 5e Cage member 5b, 5d, 5f Cage member 6a, 6c, 6e Pocket groove 6b, 6d, 6f Pocket groove 7 Top surface 8 Side surface 9 Side surface 10 Holding Container 11 Top surface 12 Side surface 13 Side surface 14 Solid lubricant coating 15 Pocket hole 16 End mill 17 Thermal spray gun 21 Top surface 22 Side surface 23 Side surface 24 Side surface 25 Side surface 27 Side surface 28 Side surface

 ──────────────────────────────────────────────────続 き Continued on the front page (73) Patent holder 000102692 NTN Corporation 1-3-17 Kyomachibori, Nishi-ku, Osaka-shi, Osaka (73) Patent holder 000229597 Nippon Parkerizing Co., Ltd. 1-1-15 Nihonbashi, Chuo-ku, Tokyo No. 1 (74) The above five attorneys Haruo Kawai (72) Inventor Takeo Yoshioka 1-2-2 Namiki, Tsukuba, Ibaraki Pref.Institute of Mechanical Engineering, Institute of Industrial Science and Technology (72) Inventor Hachiro Mizutani Namiki, Tsukuba, Ibaraki 1-2-2, Machinery Research Institute, Industrial Technology Institute (72) Inventor Hirofumi Kotorii 1-2-2, Namiki, Tsukuba, Ibaraki Prefecture Machinery Research Institute, Industrial Technology Institute (72) Inventor Takanobu Hashimoto 2, Nakata, Minamita, Toyama City, Toyama Prefecture −26 Fujikoshinai Co., Ltd. (72) Inventor Shin Shinseki 1-5-50 Kugenuma Shinmei, Fujisawa-shi, Kanagawa Sun Inside Seiko Co., Ltd. (72) Inventor Yasushi Toyota 3-5-8 Minamisenba, Chuo-ku, Osaka City, Osaka Prefecture Inside Koyo Seiko Co., Ltd. (72) Inventor Hiromi Sugi 1-5-50 Kugenuma Shinmei, Fujisawa City, Kanagawa Prefecture Nippon Seiko Co., Ltd. (72) Inventor Hiroshi Kashiwamura 3066 Oyumida, Ogata, Kuwana-shi, Mie, Japan NTN Co., Ltd. (72) Inventor Eiji Hirai 2784, Ogami, Hiratsuka-shi, Kanagawa Japan Examiner, Nippon Pakara Ising Co. Hitoshi (56) References Hikaru 2-93518 (JP, U)

Claims (1)

(57) [Claims] 1. A cage for a rolling bearing, characterized in that at least a part of a surface of the cage that is in sliding contact with a rolling member is a flat surface, and a solid lubricant is adhered to the flat surface. .