JP2013047553A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing that can stably exert a function as the bearing even when being used in a cryogenic environment, such as in the liquid hydrogen or liquid oxygen during operation, to achieve improved reliability.SOLUTION: The rolling bearing includes: an inner ring 2; an outer ring 3; a rolling member 4 interposed between the inner ring 2 and the outer ring 3; and a retainer 5 for retaining the rolling member 4 in position. In the rolling bearing, a composite layer 8 is formed at at least a rolling member corresponding surface 15 and a guiding surface corresponding surface 16 in a base material surface 7 of the retainer 5. The composite layer 8 includes: a resin impregnation layer 10 formed by impregnating a porous member 9 with a fluororesin; and a fluororesin layer 11 for covering the resin impregnation layer 10 to constitute a surface layer.

Description

  The present invention relates to a rolling bearing, and more particularly to a rolling bearing for a rocket engine turbo pump used in a cryogenic environment such as in liquid hydrogen or liquid oxygen during operation.

  The rocket engine turbo pump bearing is used in a cryogenic environment such as in liquid hydrogen or liquid oxygen during operation. That is, it is exposed to a cryogenic environment of −183 ° C. in liquid oxygen, and is exposed to a cryogenic environment of −253 ° C. in liquid hydrogen. For this reason, oil lubrication and grease lubrication cannot be used as a bearing lubrication method, and a solid lubrication method is generally employed.

  As this solid lubrication method, there is a method in which a solid lubricant (fluorine-based resin) is applied to the cage, and this solid lubricant is transferred to the rolling elements when the bearing rotates.

In addition, the rocket engine turbo pump bearing may be used at a high speed rotation with a dn value (inner ring inner diameter mm × inner ring rotation speed min ⁻¹ ) exceeding 1.6 million. For this reason, since the hoop stress acts on the cage, it is necessary to ensure the strength (or reduce the specific gravity of the cage material).

  For this reason, conventionally, there is one in which a cage is made of a glass fiber reinforced PTFE composite material (Patent Document 1). The glass fiber reinforced PTFE composite material is formed by impregnating a glass woven fabric with PTFE having self-lubricating property. That is, the structure has a structure in which solid lubricity is ensured by the fluorine-based resin on the surface of the cage, and the strength of the cage is secured by the glass woven fabric.

  In addition, there is a conventional one constituted by a cage base material (a cage body) made of an aluminum alloy or the like and a solid lubricating film covering the cage body (Patent Document 2). That is, the solid lubricating film (coating material) ensures solid lubricity and the cage strength is secured by the base aluminum alloy.

Japanese Patent Publication No. 2-20854 JP 2006-220240 A

  As described above, the bearing for the rocket engine turbo pump is used at high speed rotation. For this reason, even if a fluororesin portion (layer) is provided on the surface of the cage as in Patent Document 1 and Patent Document 2, the rolling element sliding surface and the guide surface are provided with bearing mating members (inner ring or outer ring). Slide between the cage guide surface and the rolling element). For this reason, there is a concern about the progress of abrasion and peeling of the fluororesin layer. When wear progresses or peels off, the surface of the glass woven fabric portion or the aluminum alloy base material is exposed, and contact is made with the bearing counterpart material, so that it is necessary to further improve the reliability of the bearing.

  Therefore, in view of such circumstances, the present invention provides a rolling bearing capable of achieving a stable function and achieving improved reliability even when used in a cryogenic environment such as in liquid hydrogen or liquid oxygen during operation. It is something to be offered.

  A first rolling bearing according to the present invention is a rolling bearing including an inner ring, an outer ring, a rolling element interposed between the inner ring and the outer ring, and a cage that holds the rolling element. A composite layer is formed on at least the rolling element corresponding surface and the guide surface corresponding surface on the material surface, and the composite layer includes a resin-impregnated layer in which a porous member is impregnated with a fluorine-based resin, and a surface layer that covers the resin-impregnated layer. And a fluorine-based resin layer. The fluorine-based resin is constituted by containing fluorine atoms in the molecule, such as polytetrafluoroethylene (PTFE).

  A second rolling bearing according to the present invention is a rolling bearing including an inner ring, an outer ring, a rolling element interposed between the inner ring and the outer ring, and a cage that holds the rolling element. A composite layer is formed on at least the rolling element corresponding surface and the guide surface corresponding surface on the material surface. The composite layer includes a particle dispersion layer in which fluororesin particles are dispersed in a metal matrix, and a surface layer that covers the particle dispersion layer. And a fluorinated resin layer.

  According to the first and second rolling bearings of the present invention, in the cage, at least the rolling element sliding surface and the guide surface are covered with a composite layer whose surface layer is a fluororesin layer. The fluororesin is excellent in self-lubricating properties and can exhibit excellent slipperiness. Moreover, the strength as a cage can be secured by the cage base material.

  Moreover, in the composite layer, even if wear progresses or peeling occurs on the surface fluororesin layer, the resin-impregnated layer of the composite layer also has self-lubricating properties in the first rolling bearing, and is excellent. In the second rolling bearing, the particle-dispersed layer of the composite layer also has self-lubricating properties and can exhibit excellent sliding properties. That is, even if peeling or the like occurs on the surface layer, the slipperiness can be exhibited in the resin-impregnated layer or the particle dispersion layer of the composite layer, and the cage base material can be protected.

  By the way, there is an effect (anchor effect) in which the adhesive force is increased by the adhesive entering the fine unevenness of the bonding surface and curing. In the composite layer according to the present invention, the surface on the fluororesin layer side in the resin-impregnated layer or the particle-dispersed layer can be referred to as the adhesive surface having fine irregularities, and this anchor effect is produced. For this reason, the fluororesin layer in the composite layer exhibits excellent adhesion due to the anchor effect. The anchor effect may be referred to as a throwing effect or a fastener effect.

  In the first rolling bearing, the porous member of the resin impregnated layer can be formed by thermal spraying. Thermal spraying is a coating method in which a coating material is melted or softened by heating, accelerated into fine particles, collided with the surface of the object to be coated, and solidified and deposited into flattened particles to form a film. . The fluorine resin in the fluorine resin layer preferably exceeds the internal content of the fluorine resin in the resin impregnated layer.

  In the second rolling bearing, the particle dispersion layer can be composed of a metal plating layer in which fluororesin particles are dispersed. The fluororesin of the fluororesin layer preferably exceeds the internal content of the fluororesin of the particle dispersion layer.

  The metal used for the composite layer can be a soft metal (soft metal). Here, the soft metal is a metal having a self-lubricating property that hardly damages the counterpart material even when it comes into contact with a hard metal such as a bearing steel. For example, copper (Cu), silver (Ag), gold (Au) Etc.

  The cage may be formed by applying a base plating of the same material as the metal used for the composite layer on a base material, and forming the composite layer on the base plating. Thus, by applying the base plating, it is possible to improve the adhesion of the composite layer to the base material.

  The base material of the cage is preferably composed of a high strength and low specific gravity member. Here, the high strength low specific gravity member is a material having high specific strength (low specific gravity and high material strength) such as aluminum alloy, titanium, ceramics and the like.

  The rolling bearing is preferably used for a rocket engine turbo pump.

  In the cage in the rolling bearing of the present invention, the fluorine-based resin layer can exhibit excellent slipperiness, and the strength as a cage can be secured by the cage base material. In addition, even if wear progresses on the surface of the fluororesin layer of the cage or peeling occurs, the resin-impregnated layer or the particle dispersion layer can exhibit excellent slipperiness, and the cage The cage base material can be effectively protected by the resin impregnated layer and the particle dispersed layer. Furthermore, in the cage, the adhesion of the fluororesin layer is improved by the anchor effect, and the reliability during sliding (during rotation) is improved, that is, the aggressiveness to the counterpart member is reduced. I'm going. Here, the aggression with respect to the counterpart member is wearability or damage to the counterpart member.

  As described above, the rolling bearing of the present invention is excellent for a turbo pump for a rocket engine used at high speed rotation in a cryogenic environment such as in liquid hydrogen or liquid oxygen during operation, with the cage having excellent self-lubricating properties. It becomes.

  The porous member of the resin-impregnated layer can be constituted by thermal spraying, and the particle dispersion layer can be constituted by a metal plating layer in which fluororesin particles are dispersed. Cost can be reduced. Further, by making the fluororesin of the fluororesin layer exceed the fluororesin content of the resin impregnated layer or the particle dispersion layer, more stable slipperiness can be exhibited.

  By making the metal used for the composite layer a soft metal, the reliability at the time of contact with the counterpart member side in the resin-impregnated layer or the particle dispersion layer can be improved.

  By applying the base plating, the adhesion of the composite layer to the base material can be improved, and a stable function can be exhibited over a long period of time as a rolling bearing.

  By configuring the base material of the cage with a high-strength low specific gravity member, the cage can have high strength and light weight.

It is sectional drawing of the rolling bearing which shows embodiment of this invention. It is a principal part expanded sectional view of a holder | retainer. It is a principal part expanded sectional view of another cage. It is a principal part expansion simple sectional view of a cage. The relationship between a cage and a rolling element is shown, (a) is an enlarged schematic view of the main part at the initial stage of rotation, and (b) is an enlarged schematic view of the main part with the solid lubricant transferred to the rolling element. (C) is a principal part enlarged schematic view which shows the state which a part of fluorine-type resin layer peeled. It is a simplified sectional view showing a turbo pump for a rocket engine.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 6 shows a turbo pump of a liquid rocket engine incorporating a rolling bearing (angular bearing 1) according to the present invention. The turbo pump in the present embodiment compresses the liquid oxygen side of the liquid hydrogen / liquid oxygen two-stage combustion rocket engine. The turbo pump is roughly divided into a turbine chamber 29, a main pump chamber 30 and a preburner pump chamber 31. Although not shown, the liquid hydrogen / liquid oxygen two-stage combustion rocket engine also includes a similar turbo pump that compresses the liquid hydrogen side.

  The main pump chamber 30 having a role as a centrifugal pump is provided with a guide vane 38 and an impeller 39, and a shaft on which these rotate is rotatable with respect to a member arranged so as to face the shaft. An angular ball bearing 1 is provided for support. Liquid oxygen flows from the main pump inlet 36 into the main pump chamber 30 and reaches the guide vane 38 and the impeller 39 through the inducer 37. The inflowing liquid oxygen is compressed by the centrifugal force generated by the rotation of the guide vane 38 and the impeller 39, and once flows out of the turbo pump from the main pump outlet 40.

Liquid oxygen flowing out of the main pump outlet 40 to the outside of the turbo pump flows into the turbine chamber 29 and the preburner pump chamber 31 from the gas inlet 32. In the turbine chamber 29, the turbine blades 34 are driven by the primary combustion gas from the preburner flowing from the gas inlet 32 to the gas outlet 33, and reach a high-speed rotation of about 18000 min ⁻¹ . The rotation is transmitted to each angular ball bearing 1 by the turbine shaft 35, and the dn value is a maximum of 820,000. In addition, the dn value of the angular ball bearing 1 of the turbo pump that compresses the liquid hydrogen side is a maximum of 1.72 million ultra high speed rotation. Further, liquid oxygen flows into the angular ball bearing 1 on the preburner pump chamber 31 side from the preburner pump inlet 41. That is, these angular ball bearings 1 are exposed to a cryogenic environment of -183 ° C. The angular contact ball bearing 1 of the turbo pump that compresses the liquid hydrogen side is exposed to a cryogenic environment of −253 ° C.

  As shown in FIG. 1, the angular ball bearing (rolling bearing) 1 includes an inner ring 2 having a raceway surface 2 a formed on the outer peripheral surface, an outer ring 3 having a raceway surface 3 a formed on the inner peripheral surface, and the inner ring 2. A rolling element 4 interposed between the raceway surface 2 a and the raceway surface 3 a of the outer ring 3 and a cage 5 that holds the rolling element 4 are provided. As this rolling element 4, a ball 4A is used.

  By the way, in the angular ball bearing 1, the straight line connecting the contact points between the rolling elements 4, the inner ring 2 and the outer ring 3 has an angle, and can carry a radial load and one axial load. Further, when a radial load is applied, an axial component force is generated. For this reason, as shown in FIG. 5, two are used facing each other.

For the inner ring 2, the outer ring 3, and the ball 4A, a normal bearing material can be used. For example, martensitic stainless steel can be used. The ball 4A may be a ceramic ball. In the case of using ceramics, silicon nitride (Si ₃ N ₄ ), silicon carbide (SIC), alumina (AI ₂ O ₃ ), zirconia (ZrO ₂ ), sialon and the like can be mentioned.

  The cage 5 is a short cylindrical body, and pockets 6 are formed in the circumferential wall at a predetermined pitch along the circumferential direction, and the balls 4A are held in the pockets 6. In this case, an outer ring guide type in which the cage 5 is guided by the outer ring 3.

  As shown in FIG. 2, the cage 5 includes a cage body (cage base material) 7 and a composite layer 8 that covers the cage base material 7. The cage base material 7 is made of a material having a high specific strength (tensile strength per density) such as an aluminum alloy, titanium, or ceramic. Here, the material having a high specific strength is a material having a low specific gravity and a high material strength (material of a high strength and low specific gravity member). Specifically, in order to withstand hoop stress due to high-speed rotation, it is about 90 kN · m / kg or more, and the specific strength is higher than that of a copper material.

  The composite layer 8 includes a resin-impregnated layer 10 in which a porous member 9 is impregnated with a fluorine-based resin, and a fluorine-based resin layer 11 that covers the resin-impregnated layer 10 and forms a surface layer. The porous member 9 can be composed of a soft metal (soft metal). Here, the soft metal (soft metal) is a self-lubricating metal that hardly damages the counterpart material even when it comes into contact with a hard metal such as bearing steel, and is copper (Cu), silver (Ag), gold (Au) or the like. If the pore diameter and the porosity are too small, the lubricity of the resin-impregnated layer is lowered, and if it is too large, the adhesion to the base material is lowered. Therefore, the pore diameter is, for example, about 0.0001 mm to 0.1 mm. The porosity is, for example, 5% to 70%. Further, the fluorine resin in the fluorine resin layer 11 exceeds the internal content of the fluorine resin in the resin impregnated layer 10.

  The porous member 9 can be formed by thermal spraying, for example. Specifically, the soft metal powder is sprayed onto the base material 7 at a temperature close to its melting point. After the porous member 9 is formed, the pores of the porous member 9 are impregnated with the fluorine-based resin by a vacuum impregnation method or the like, and the fluorine-based resin layer 11 is formed as a surface layer for the porous member 9. Can do. The fluorine-based resin is configured to include a fluorine atom in the molecule. For example, a polymer or copolymer such as tetrafluoroethylene, hexafluoropropylene, chlorotrifluoroethylene, vinylidene fluoride, and vinyl fluoride is used. These can also be used as a copolymer with vinyl monomers such as ethylene, propylene, vinylidene chloride, and perfluoroalkyl vinyl ether. Among these, polytetrafluoroethylene, polyhexafluoropropylene, tetrafluoroethylene / hexafluoropropylene copolymer, tetrafluoroethylene / ethylene copolymer, polychlorotrifluoroethylene, chlorotrifluoroethylene / ethylene copolymer, Tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, polyvinylidene fluoride, and polyvinyl fluoride are preferable, and polytetrafluoroethylene, tetrafluoroethylene / hexafluoropropylene copolymer, and tetrafluoroethylene / ethylene copolymer are preferable. In particular, in the present invention, a material exhibiting excellent solid lubricity can be employed, and polytetrafluoroethylene (PTFE) or the like is optimal.

  Such a composite layer 8 may be formed directly on the surface of the base material 7, but it is preferable to apply a base plating 12 to the surface of the base material 7 as shown in FIG. 2. The base plating 12 is preferably made of the same material as the porous member 9, that is, the sprayed metal. When the base plating 12 is applied, various plating methods such as electroplating, electroless plating, and hot dipping can be employed.

  The thickness (thickness dimension) of the composite layer 8 configured as described above is, for example, about 0.05 mm to 0.5 mm in order to suppress exposure of the cage base material due to wear of the composite layer and peeling of the composite layer. Is done. The thickness of the resin-impregnated layer 10 and the fluorine-based resin layer 11 is applied so that the total of the resin-impregnated layer 10 and the fluorine-based resin layer 11 is within the thickness of the composite layer 8, and considering the transferability and wear resistance of the resin to the rolling elements, The thickness of the resin impregnated layer 10 is, for example, about 0.02 mm to 0.4 mm, and the thickness of the fluororesin layer 11 is, for example, about 0.02 mm to 0.4 mm. The thickness of the base plating 12 is, for example, about 0.01 mm to 0.05 mm.

  Incidentally, the composite layer 8 may cover the entire surface of the base material 7 of the cage 5, but as shown in FIG. 4, at least the rolling element corresponding surface 15 and the guide surface of the base material surface. The corresponding surface (base material outer diameter surface) 16 may be covered. That is, the composite layer 8 surface layer covering the rolling element corresponding surface 15 becomes a rolling element sliding surface (the inner surface 6a of the pocket 6) on which the rolling element 4 rolls, and the composite layer 8 surface layer covering the guide surface corresponding surface 16 is formed. This is a cage outer diameter surface 14 facing the inner diameter surface of the outer ring 3.

  Next, in FIG. 3, the composite layer 8 includes a particle dispersion layer 20 in which fluorine resin particles 19 are dispersed in a metal matrix 18, and a fluorine resin layer 11 that covers the particle dispersion layer 20 and forms a surface layer. Become. That is, the particle dispersion layer 20 is a metal matrix composite material (MMC). Here, the metal matrix composite material is a composite material having a metal as a matrix, and is roughly classified into a particle-reinforced dispersion type and a fiber-reinforced type, depending on the form of the reinforcing material and the difference in the reinforcing mechanism. The former is one in which ceramic particles are dispersed in a metal matrix to improve metal deformation resistance, and has no anisotropy. The latter is strongly anisotropic in the direction in which the reinforced fibers are arranged. It has advantages such as excellent specific strength and specific rigidity. Accordingly, the particle dispersion layer 20 shown in FIG. 3 is the former particle-reinforced dispersion type metal matrix composite material.

  Similar to the porous member 9, the metal matrix 18 is made of a soft metal (soft metal) such as copper (Cu), silver (Ag), or gold (Au). In addition, since the lubricity of a particle dispersion layer will fall when the particle size of the fluororesin particle 19 is too small, and adhesiveness with a base material will fall when too large, for example, a particle size is about 0.0001 mm-about 0.1 mm. It is said. Also in this case, the base material 7 is provided with a base plating 12 on the surface. Further, the fluorine resin of the fluorine resin layer 11 exceeds the internal content of the fluorine resin of the particle dispersion layer 20.

  Next, a method for forming the composite layer 8 shown in FIG. 3 will be described. First, the base plating 12 is applied to the surface of the base material 7. Thereafter, the base material 7 is immersed in a dispersion in which the fluororesin particles 19 are dispersed, and the composite layer 8 is formed by electroless plating or electrolytic plating (electroplating). The dispersion in this case is, for example, a plating solution (copper nitrate or the like) in which copper is in an ionic state. For this reason, when the base material 7 is immersed in this plating solution, the copper particles are deposited on the base material 7 through the plating 12 in the form of taking in the fluororesin particles 19. Accordingly, the particle dispersion layer 20 in which the fluorine resin particles 19 are dispersed and the fluorine resin layer 11 covering the particle dispersion layer 20 are formed.

  The thickness (thickness dimension) of the composite layer 8 configured as described above is, for example, about 0.05 mm to 0.5 mm in order to suppress exposure of the cage base material due to wear of the composite layer and peeling of the composite layer. Is done. Further, the thickness of the particle dispersion layer 20 and the fluorine-based resin layer 11 is applied so that the sum of the thickness is within the thickness of the composite layer 8, taking into consideration the transferability and wear resistance of the resin to the rolling elements. The thickness of the particle dispersion layer 20 is, for example, about 0.02 mm to 0.4 mm, and the thickness of the fluororesin layer 11 is, for example, about 0.02 mm to 0.4 mm. The thickness of the base plating 12 is, for example, about 0.01 mm to 0.05 mm.

  Incidentally, even the composite layer 8 shown in FIG. 3 may cover the entire surface of the base material 7 of the cage 5, but as shown in FIG. The rolling element corresponding surface 15 and the guide surface corresponding surface 16 may be covered.

  In the case where the composite layer 8 is formed as shown in FIG. 3, the rolling element 4 rolls with respect to the fluororesin layer 11 as shown in FIG. 5A in the initial stage. Then, as the rolling element 4 rolls, the fluorine resin (solid lubricant) of the fluorine resin layer 11 is transferred to the surface of the rolling element 4 as shown in FIG. Furthermore, as the rolling element 4 rolls, as shown in FIG. 5C, wear may develop in the fluororesin layer 11 or peeling may occur. However, even if peeling or the like occurs as described above, the surface of the base material 7 can be protected by the particle dispersion layer 20 having slipperiness. In addition, although this effect was demonstrated in the composite layer 8 shown in FIG. 3, even if it is the composite layer 8 shown in FIG. 2, there exists the same effect.

  Thus, in the rolling bearing of the present invention, the fluororesin layer 11 can exhibit excellent slipperiness, and the cage base material 7 can ensure strength as a cage. Further, even if wear progresses or peeling occurs on the surface fluororesin layer 11, the resin-impregnated layer 10 and the particle-dispersed layer 20 can exhibit excellent slipperiness, and the resin-impregnated layer The cage base material 7 can be effectively protected by the layer 10 or the particle dispersion layer 20.

  By the way, there is an effect (anchor effect) in which the adhesive force is increased by the adhesive entering the fine unevenness of the bonding surface and curing. In the composite layer 8 according to the present invention, the surface of the resin-impregnated layer 10 or the particle-dispersed layer 20 on the fluorine resin layer side corresponds to the adhesive surface having fine irregularities, and this anchor effect is produced. For this reason, the fluororesin layer 11 in the composite layer exhibits excellent adhesion due to the anchor effect. The anchor effect may be referred to as a throwing effect or a fastener effect.

  The porous member 9 of the resin-impregnated layer 10 can be constituted by thermal spraying, and the particle dispersion layer 20 can be constituted by a metal plating layer in which fluororesin particles are dispersed. Can be achieved at low cost. Further, by making the fluorine resin of the fluorine resin layer 11 exceed the fluorine resin content of the resin impregnated layer 10 and the particle dispersion layer 20, more stable slipperiness can be exhibited.

  By making the metal used for the composite layer 8 a soft metal, it is possible to improve the reliability when the resin impregnated layer 10 and the particle dispersion layer 20 are in contact with the counterpart member side. By applying the base plating 12, the adhesion of the composite layer 8 to the base material 8 can be improved, and a stable function can be exhibited over a long period of time as a rolling bearing. By configuring the base material 7 of the cage 5 with a high strength and low specific gravity member, the cage 5 can have high strength and light weight.

  As described above, the rolling bearing of the present invention is used for a turbo pump for a rocket engine that is used at high speed rotation in a cryogenic environment such as in liquid hydrogen or liquid oxygen during operation because the cage 5 has excellent self-lubricating properties. It will be optimal.

  As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, the number of pockets 6 for holding the ball 4A is the same as the number of pockets 6. Can be increased or decreased arbitrarily. In the above embodiment, the outer ring guide type guides the cage 5 with the outer ring 3, but the inner ring guide type guides the cage 5 with the inner ring 2. Thus, in the inner ring guide type, the composite layer 8 may cover at least the rolling element sliding surface corresponding surface 15 and the base material inner diameter surface 17 (see FIG. 4) of the base material surface. Of course, even if it is an inner ring guide type, the whole surface of the base material 7 may be covered with the composite layer 8. Moreover, the roller bearing which used the roller for the rolling element may be sufficient as a bearing.

2 Inner ring 3 Outer ring 4 Rolling element 5 Cage 6 Pocket 7 Cage base material 8 Composite layer 9 Porous member 10 Resin impregnated layer 11 Fluorine-based resin layer 15 Rolling element corresponding surface 16 Guide surface corresponding surface 18 Metal matrix 19 Fluorine resin particles 20 Particle dispersion layer

Claims (10)

In a rolling bearing comprising an inner ring, an outer ring, a rolling element interposed between the inner ring and the outer ring, and a cage that holds the rolling element,
A composite layer is formed at least on the rolling element corresponding surface and the guide surface corresponding surface on the surface of the base material of the cage. The composite layer includes a resin-impregnated layer in which a porous member is impregnated with a fluororesin, and the resin-impregnated layer. A rolling bearing comprising a fluorine-based resin layer that covers and forms a surface layer. The rolling bearing according to claim 1, wherein the porous member of the resin-impregnated layer is formed by thermal spraying.   The rolling bearing according to claim 1 or 2, wherein the fluorine resin in the fluorine resin layer exceeds the internal content of the fluorine resin in the resin impregnated layer. In a rolling bearing comprising an inner ring, an outer ring, a rolling element interposed between the inner ring and the outer ring, and a cage that holds the rolling element,
A composite layer is formed at least on the rolling element corresponding surface and the guide surface corresponding surface on the base material surface of the cage, and the composite layer covers a particle dispersion layer in which fluororesin particles are dispersed in a metal matrix, and a particle dispersion layer. And a fluorine-based resin layer constituting the surface layer.   The rolling bearing according to claim 4, wherein the particle dispersion layer is a metal plating layer in which fluorine resin particles are dispersed. The rolling bearing according to claim 4 or 5, wherein the fluorine resin in the fluorine resin layer exceeds the internal content of the fluorine resin in the particle dispersion layer.
  The rolling bearing according to any one of claims 1 to 6, wherein the metal used for the composite layer is a soft metal.   The retainer is provided with a base plating of the same material as the metal used for the composite layer on a base material, and the composite layer is formed on the base plating. The rolling bearing according to any one of the above.   The rolling bearing according to any one of claims 1 to 8, wherein the base material of the cage is configured by a high strength and low specific gravity member.   It is used for the turbo pump for rocket engines, The rolling bearing of any one of Claims 1-9 characterized by the above-mentioned.

Images