JP2006226459A - Rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing requiring a small amount of lubricating oil for securing a sufficient service life by eliminating sealing torque while maintaining sealability inside the bearing, shutting off intrusion of foreign matter into a bearing space with lubricating oil outside the bearing repelled by volatile oil films containing volatile oil components less liable to wet with the lubricating oil, and applying only oil plating lubrication to the inside of the bearing to lower the torque of the whole bearing. <P>SOLUTION: In the rolling bearing 10, oil plating is applied to at least one of an inner ring raceway 13 of an inner ring 11, an outer ring raceway 16 of an outer ring 14 and a rolling element 17 and the volatile oil films 22, 26 containing components less liable to wet with the lubricating oil are formed on at least one surface of the front end of a seal plate 18, an outer peripheral face 12 of the inner ring 11 and an inner peripheral face 15 of the outer ring 14, adjacently facing one another in no contact. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rolling bearing that is required for a dust transmission and low torque characteristics used in a gear transmission and the like.

  Conventionally, a gear transmission incorporates a plurality of rotating shafts and many gears. These rotary shafts and gears are rotatably supported with respect to the housing and the support shaft by rolling bearings such as ball bearings and cylindrical roller bearings.

  In general, rolling bearings used in gear transmissions are open types that do not seal the bearing space, but such transmissions have wear powder generated at the meshing portions of the gears during operation. There are many foreign substances. When such foreign matter enters the rolling bearing, an indentation is formed on the surface of the rolling contact portion by the foreign matter, and the surface is fatigued, peeled (flaked), and damaged based on the indentation. It becomes easy.

  As an example of a conventional rolling bearing, there is known a rolling bearing that avoids formation of indentation by using a new material that does not easily form indentation or by performing heat treatment (see, for example, Patent Document 1).

  Further, as another example of a conventional rolling bearing, a rolling bearing equipped with a sealing plate is known (for example, see Patent Document 2).

  As shown in FIG. 8, the rolling bearing 80 disclosed in Patent Document 2 is a rolling bearing used in an environment where there are many metallic foreign matters such as an automobile transmission which is one of typical gear transmissions. And an inner ring 81 having a deep groove type inner ring raceway 82 at the axially intermediate portion of the outer peripheral surface, and a deep groove type outer ring raceway 84 at the axially intermediate portion of the inner peripheral surface, and arranged concentrically with the inner ring 81. An outer ring 83 and a plurality of balls 85 arranged between the inner ring raceway 82 and the outer ring raceway 84 so as to roll freely are provided. The plurality of balls 85 are held in a plurality of pockets 87 provided in the holder 86 so as to be rollable one by one.

  Further, the rolling bearing 80 locks the outer peripheral edge portions of the sealing plates 89 and 89 in locking grooves 88 and 88 provided on the inner peripheral surfaces of both ends of the outer ring 83 over the entire circumference. The leading edge portions of the seal lips 90, 90 included in the sealing plates 89, 89 are brought into sliding contact with the inner wall surfaces 92, 92 of the seal grooves 91, 91 formed on the outer peripheral surfaces of both ends of the inner ring 81.

  Such a rolling bearing 80 is based on the rolling of each ball 85, and relative rotation between a shaft member (not shown) with the inner ring 81 fitted and fixed and an outer member (not shown) with the outer ring 83 fitted and fixed. Is acceptable. A pair of sealing plates 89 and 89 with the outer peripheral edges locked to the inner peripheral surfaces of both ends of the outer ring 83 are bearing spaces in which foreign particles such as dust, oil, water, etc. floating outside are arranged in the balls 85. Do not penetrate into 93.

  As another example of a conventional rolling bearing, a small amount of lubricating oil is applied to the inner and outer rings in order to minimize the amount of lubricating oil to be filled during assembly and to stably supply the lubricating oil after the start of operation. A so-called oil-plated rolling bearing is known (see, for example, Patent Document 3).

Further, as another example of a conventional rolling bearing, there is known a rolling bearing that is lubricated by a cage impregnated with lubricating oil and applied lubricating oil on the raceway surfaces of the inner ring and the outer ring (see, for example, Patent Document 4).
Japanese Patent Laid-Open No. 11-80838 JP 2002-327761 A Japanese Unexamined Patent Publication No. 64-046011 JP 2000-234625 A

  However, in the above-mentioned Patent Document 1, there is a problem that a new installation of equipment associated with the production of materials and a cost for heat treatment are required, which is difficult to realize.

  Further, in Patent Document 2, the edge of the seal lip 90 and the inner wall surface 92 of the seal groove 91 formed on the outer peripheral surface of both ends of the inner ring 81 are in sliding contact with each other in order to improve the sealability inside the bearing. These frictions increase the torque of the entire bearing, and as a result, there is a problem that the energy efficiency of the transmission decreases. On the other hand, if the seal is made to be a non-contact type in order to eliminate the above-mentioned friction, foreign matters such as lubricating oil and contamination outside the bearing may enter the bearing space, which may lead to a reduction in bearing life.

  Further, in Patent Document 3 and Patent Document 4 described above, in the gear transmission, since the lubricating oil is flowing vigorously, the oil enters the bearing, and as a result, even if oil plating is performed. Low torque effect and torque fluctuation suppression effect cannot be expected.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an oil-repellent film containing an oil-repellent component that is not easily wetted by lubricating oil while eliminating the sealing torque while maintaining the sealing performance inside the bearing. Blows the lubricating oil outside the bearing to block the intrusion of foreign matter into the bearing space, reduces the torque of the entire bearing by only lubricating the inside of the bearing with oil plating, and even a small amount of lubricating oil is sufficient It is providing the rolling bearing which can ensure a lifetime.

1) A rolling bearing according to the present invention includes an inner ring having an inner ring raceway on an outer peripheral surface, an outer ring having an outer ring raceway on an inner peripheral surface, and a rolling element disposed between the inner ring raceway and the outer ring raceway so as to be freely rollable. A seal plate that is mounted on both sides in the axial direction with respect to the rolling element and has a distal end portion that is in close contact with the outer peripheral surface of the inner ring or the inner peripheral surface of the outer ring in close contact with each other. A rolling bearing comprising:
Oil plating is applied to at least one of the inner ring raceway, the outer ring raceway, and the rolling element, and the seal tip, the outer peripheral surface of the inner ring facing the seal tip, or the inner periphery of the outer ring An oil repellent film is formed on at least one of the surfaces.

  Here, as oil plating, for example, mineral oil, hydrocarbon lubricant, fatty acid ester lubricant, fluorine lubricant, silicone lubricant, etc. are dissolved in an appropriate solvent (for example, petroleum benzine, white kerosene). It is carried out by immersing in the liquid so as to evaporate the solvent or spraying the liquid directly on the bearing.

  In addition, the oil repellent film that is not easily wetted by the lubricating oil can be formed of, for example, a fluorine-based surfactant, a fluorine-based silane coupling agent, or a fluorine-based polymer. That is, the oil repellent film contains components that are not easily wetted by the oil plating and external lubricating oil. The oil repellent film may be formed by applying an oil repellent film to a predetermined portion. If necessary, an oil repellent can be diluted with a solvent (for example, alternative chlorofluorocarbon or fluorine-based solvent) and applied to obtain a thin and uniform film.

  According to the invention described in 1) above, the lubricating oil existing outside the bearing is caused by the oil repellent film attached to at least one of the tip of the seal plate, the outer peripheral surface of the inner ring, and the inner peripheral surface of the outer ring. Since it is difficult for the lubricating oil to get wet, it does not enter the bearing space. As a result, the bearing is lubricated only by a small amount of oil by oil plating, and rolling friction is reduced. Further, since the amount of the lubricating oil is very small, the stirring resistance is reduced, and as a result, the bearing torque is reduced. Furthermore, a sufficient life can be ensured even with a minute amount of lubricating oil. Therefore, while maintaining the sealability inside the bearing, the seal torque is eliminated, and the oil-repellent film containing an oil-repellent component that is difficult to get wet with the lubricant repels the lubricant outside the bearing and blocks foreign matter from entering the bearing space. By making the inside of the bearing only lubricated by oil plating, the torque of the entire bearing can be reduced, and a sufficient life can be secured even with a minute amount of lubricating oil.

  2) The rolling bearing according to the present invention is the rolling bearing described in 1) above, wherein at least the rolling elements are carbonitrided and quenched using steel having a Si content of 0.5% by weight or more. After that, it is characterized by high temperature tempering.

  According to the invention described in 2) above, the counterpart member is obtained by performing quenching after carbonitriding using steel having a Si content of 0.5% as the material of the rolling element and further performing tempering at a high temperature. It is possible to suppress surface fatigue in the inner ring raceway of the inner ring and the outer ring raceway of the outer ring. Thereby, the lifetime of a rolling element can be extended and the life of a rolling bearing can be aimed at.

  According to the rolling bearing of the present invention, it is possible to solve the problems that cost is high, energy efficiency is lowered, low torque effect and torque fluctuation suppressing effect cannot be expected, and thereby sealing while maintaining the sealability inside the bearing. In addition to eliminating torque, the oil-repellent film containing an oil-repellent component that is hard to get wet with the lubricating oil repels the lubricating oil outside the bearing and blocks the intrusion of foreign matter into the bearing space, leaving the inside of the bearing only lubricated by oil plating. As a result, it is possible to reduce the torque of the entire bearing and to obtain an effect that a sufficient life can be ensured even with a minute amount of lubricating oil.

Hereinafter, a plurality of exemplary embodiments according to the present invention will be described in detail with reference to the drawings.
1 is a cross-sectional view of a first embodiment of a rolling bearing according to the present invention, FIG. 2 is a partially enlarged view of the rolling bearing shown in FIG. 1, and FIG. 3 is a cross-sectional view of a second embodiment of the rolling bearing according to the present invention. 4 is a partially enlarged view of the rolling bearing shown in FIG. 3, FIG. 5 is a sectional view of a third embodiment of the rolling bearing according to the present invention, and FIG. 6 is a sectional view of the fourth embodiment of the rolling bearing according to the present invention. FIG. 7 is a cross-sectional view of a fifth embodiment of the rolling bearing according to the present invention.

  As shown in FIG. 1, a rolling bearing 10 according to a first embodiment of the present invention includes an inner ring 11 having an inner ring raceway 13 on an outer peripheral surface 12, an outer ring 14 having an outer ring raceway 16 on an inner peripheral surface 15, and these inner rings. A ball 17 that is a plurality of rolling elements disposed so as to be freely rollable between the track 13 and the outer ring raceway 16, and an outer peripheral edge portion that is a base end portion on the both sides in the axial direction with respect to the ball 17 is an inner periphery of the outer ring 14. A pair of annular seal plates 18 and 18 which are fitted to the surface and whose inner peripheral edge as a tip portion extends to the vicinity of the outer peripheral surface 12 of the inner ring 11, and are used for gear transmission of an automobile transmission or the like. Built into the machine.

  Further, the rolling bearing 10 has a cage 19, and this cage 19 holds balls 17 in a pocket 20 formed at equal intervals in the circumferential direction so as to be freely rollable. The retainer 19 in this case is a corrugated press retainer.

  In the inner ring 11, a deep groove type inner ring raceway 13 is disposed in the axially central portion of the outer peripheral surface 12, and an oil plating layer 21 with oil plating is formed on the surface of the inner ring raceway 13. In the inner ring 11, oil repellent films 22 are formed at both axial ends of the outer peripheral surface 12. The oil repellent film 22 contains components that are not easily wetted by the oil plating and external lubricating oil.

  In the outer ring 14, a deep groove type outer ring raceway 16 is disposed in the axially central portion of the inner peripheral surface 15, and an oil plating layer 23 is formed on the surface of the outer ring raceway 16. The outer ring 14 has seal plate fixing portions 24 and 24, which are locking grooves for attaching the seal plates 18 and 18, near both axial ends of the inner peripheral surface 15.

  The ball 17 has an oil plating layer 25 having an oil plating surface. The ball 17 is a steel containing 0.5 wt% or more and 2.0 wt% or less of Si as a material, and after carbonitriding is performed so that the surface nitrogen concentration is 0.2 wt% or more, Furthermore, high temperature tempering is performed. Further, the balls 17 have a retained austenite amount of the surface portion of 20% by volume or less. Moreover, the high temperature tempering of the ball | bowl 17 is the range of 200 to 300 degreeC. The ball 17 has a surface roughness smaller than that of the inner ring raceway 13 of the inner ring 11 and the outer ring raceway 16 of the outer ring 14. Further, the ball 17 has an N concentration in the surface portion of 0.2 to 2.0% by weight. As a result, the friction between the inner ring raceway 13 of the inner ring 11 and the outer ring raceway 16 of the outer ring 14 is reduced to reduce the damage on the mating member surface. As a result, the life of the rolling bearing 10 can be extended.

  The reason why the ball 17 is subjected to the high nitrogen carbonitriding process is that friction between the ball 17 and the tracks 13 and 16 can be reduced at a low cost. If it is going to use for each track | truck 13,16, since it will be necessary to perform a high nitrogen carbonitriding process to both the inner ring | wheel 11 and the outer ring | wheel 14, it will become expensive and is not preferable. Since the inner ring 11 and the outer ring 14 are repeatedly subjected to shear stress in their load zone, the amount of retained austenite is required when used in an environment where slipping easily occurs due to contamination with foreign matter. However, in the case where seizure is likely to occur due to use at a high speed, the seizure resistance is better when the amount of retained austenite is smaller. From the above, it is effective to use the ball 17 and the heat treatment used for the inner ring 11 and the outer ring 14 needs to be changed according to the environment. Needless to say, the inner ring 11 and the outer ring 14 may be used.

  After the ball 17 is mounted between the inner and outer rings 11, 14, the seal plate 18 is mounted and fixed on the seal plate fixing portion 24 of the outer ring 14, so that the inner periphery of the seal plate 18 is the inner ring 11. It is a non-contact type that is close to the outer peripheral surface 12. Since the seal plate 18 is a non-contact type, the seal torque is eliminated as compared with the contact type that contacts the inner ring 11, so that the torque of the entire bearing can be reduced. The seal plate 18 has an oil repellent film 26 formed on the inner periphery.

  Here, the oil plating layers 21, 23, and 25 applied to the inner ring raceway 13 of the inner ring 11, the outer ring raceway 16 of the outer ring 14, and the surface portion of the ball 17 are, for example, mineral oil, hydrocarbon-based lubricant, A fatty acid ester-based lubricant, a fluorine-based lubricant, a silicone-based lubricant, etc. are immersed in a solution in an appropriate solvent (for example, petroleum benzine, white kerosene) to evaporate the solvent, It is carried out by spraying directly on the surface. The amount of the lubricating oil adhering to the oil plating is not particularly limited as long as it can impart lubricity to the bearing. The oil plating is preferably applied to all of the inner ring raceway 13, the outer ring raceway 16, and the balls 17, but may be applied to any one of them.

  Further, as the oil repellent film 22 formed on both ends in the axial direction on the outer peripheral surface 12 of the inner ring 11 and the oil repellent film 26 formed on the inner peripheral edge of the seal plate 18, for example, a fluorine-based surfactant, a fluorine-based silane cup, etc. It is a film capable of repelling lubricating oil formed of a ring agent and a fluorine-based polymer. The oil repellent films 22 and 26 can be applied to a thin and uniform film by diluting and applying an oil repellent agent with a solvent (for example, alternative chlorofluorocarbon or fluorine-based solvent) as necessary. The part to which the oil repellent agent is attached may be either one of the outer peripheral surface 12 of the inner ring 11 and the opposing surface of the non-contact part which is the inner peripheral edge of the seal plate 18, but it should be attached to both. Is desirable. Further, any portion other than the rolling contact surface of the ball 17, the inner ring raceway 13, and the outer ring raceway 16, which is a rolling contact surface, may be applied without particular limitation.

  As shown in FIG. 2, the rolling bearing 10 exists outside the bearing by the oil repellent films 22 and 26 formed on both axial ends of the outer peripheral surface 12 of the inner ring 11 and the inner peripheral edge of the seal plate 18. Since the lubricating oil 27 is repelled and does not adhere to these portions, the lubricating oil 27 does not enter the bearing space. Thereby, the bearing is lubricated by only a small amount of oil by the oil plating layers 21, 23, 25 applied to the inner ring raceway 13 of the inner ring 11, the outer ring raceway 16 of the outer ring 14, and the balls 17. And rolling friction is reduced. Further, since the amount of the lubricating oil is very small, the stirring resistance is reduced, and as a result, the bearing torque is reduced.

  Si as a material of the ball 17 in such a rolling bearing 10 is an element necessary as a deoxidizer during steelmaking, but is an element effective for improving the temper softening resistance of the steel. It is an element that has the effect of increasing the nitrogen concentration in the surface portion when carbonitriding is performed. Based on this, by using steel having a Si content of 0.5% by weight or more for the material of the balls 17, quenching is performed after carbonitriding, and further tempering is performed at a high temperature of 200 ° C. or more. The effect of suppressing the surface fatigue of the mating member can be obtained. Here, the lower limit of the Si content is 0.5% by weight. In order to obtain the effect, the lower limit of the Si content is preferably 0.8% by weight. Moreover, since it will reduce the machinability of a raw material and cause an increase in cost when it contains excessively, it is desirable that the upper limit of Si content shall be 2.0 weight%. More preferably, the upper limit of the Si content is 1.5% by weight.

  If the ball 17 is too low in tempering temperature, the effect of extending the life of the mating member cannot be sufficiently obtained. Preferably, the tempering temperature is increased so that the amount of retained austenite in the surface portion is less than 20% by volume, and more preferably, the tempering temperature is selected so that the amount of retained austenite in the surface portion is 18% by volume or less. Can effectively extend the service life. On the other hand, if the tempering temperature is too high, the life is reduced due to the decrease in hardness and the amount of retained austenite, and the life as a bearing is lowered. Therefore, the upper limit of the tempering temperature is set to 300 ° C. At this time, in order to prevent the life of the bearing from being reduced due to a decrease in the life of the balls 17, it is preferable to select a tempering temperature and to set the amount of retained austenite at the surface portion to 7% by volume or more.

  Furthermore, the ball 17 has a higher effect of reducing damage to the mating member as the surface N concentration is increased. Therefore, the lower limit of the surface N concentration is preferably 0.2% by weight or more, more preferably 0. .5% by weight or more. However, if the N concentration is too high, a fragile nitrided layer may be formed and the life expectancy of the bearing may be lowered, so the upper limit is preferably set to 2.0% by weight. Moreover, it is necessary to adjust about the density | concentration of C of the surface part added simultaneously with N by carbonitriding so that the hardness of 650HV of surface hardness required as a rolling member is obtained. For this reason, it is preferable to adjust the C concentration so that the sum of the surface portion C concentration and the N concentration is 0.8 wt% or less. More preferably, if the C concentration in the surface portion is too high, coarse carbides may be precipitated and the life characteristics of the ball 17 itself may be lowered. Therefore, the upper limit should be 2.5% by weight. Is preferable, and more preferably 2.0% by weight or less. In order to reduce damage to the mating member, the amount of retained austenite, nitrogen concentration, or carbon concentration on the surface where metal contact occurs is important, and the surface portion in the present invention means a range of at least 1 μm from the outermost surface. To do.

  Next, the critical significance of each numerical value in the element selected as the material of the ball 17 will be described.

  With respect to the C content of the material of 0.3 to 1.2% by weight, C is an element necessary for increasing the strength by converting the matrix into martensite. In the surface portion of the present invention, it is possible to add C simultaneously with N by carbonitriding, so that the C content of the material can ensure the strength required for the core of the ball 17 in the completed state. Therefore, the lower limit of the C content is 0.30% by weight or more. More preferably, the core hardness of the ball 17 is desirably 650 HV or higher, and the lower limit of the C content is preferably 0.80 wt% or higher.

  However, if the C content of the raw material is too large, coarse carbides may be generated at the steelmaking stage and the rolling fatigue characteristics may be reduced, so the upper limit is 1.20% by weight.

  About Mn content of a raw material, Mn is an element required as a deoxidizer and a desulfurization agent at the time of steelmaking, and in order to fully acquire the effect, it is preferable to contain 0.20 weight% or more. Moreover, since Mn is an element effective for improving hardenability, it is more preferable to contain 0.25% by weight or more.

  However, if the content is too high, the non-metallic inclusions may increase so much that the life characteristics may deteriorate, and the machinability such as the forgeability and machinability of the material will decrease. The upper limit of the Mn content is 2.0% by weight.

  Regarding the Cr content of the material, Cr is an element effective for improving hardenability and temper softening resistance, and has the effect of strengthening the base and improving rolling fatigue life characteristics. It also has the function of improving wear resistance by forming fine and high hardness carbides and carbonitrides. Furthermore, it has the effect of increasing the C concentration of the carbonitriding layer, and is an effective element for improving the carbonitriding characteristics. In order to fully exhibit these actions and effects, the lower limit of the Cr content is 0.5% by weight.

  However, even if it is added in a large amount, not only the effect is saturated, but also the formation of a non-moving body film on the surface may adversely affect the carbonitriding property, so the upper limit of the Cr content is 2. It is preferably 0% by weight.

  Regarding the O content of the material, O forms oxide-based non-metallic inclusions that are harmful to the rolling fatigue life characteristics. Therefore, it is necessary to reduce the content as much as possible, and the upper limit of the content is 12 ppm. It is preferable. More preferably, it is 9 ppm or less.

  In addition to the above alloy elements, it goes without saying that impurity elements inevitable in steelmaking (for example, P, S, Ni, Cu, Mo, V, Al, Ti, Nb, etc.) are included. Further, carbide forming elements such as Mo and V are effective for improving wear resistance by forming fine and high hardness carbonitride by carbonitriding, and may be added in a trace amount as long as the cost permits. However, the upper limit of the amount added is preferably 2.0% by weight or less in total.

  Further, it has been found that not only the effect of the ball 17 but also the combination of the inner ring 11 and the outer ring 14 can extend the life. In order to reduce surface damage, it is effective to increase the retained austenite and hardness of the inner and outer rings 11 and 14. Residual austenite works effectively for stress relaxation at the indentation edge, and the hardness is effective for wear resistance and indentation resistance. Therefore, the inner and outer rings 11 and 14 are preferably subjected to carburizing or carbonitriding. However, unlike the carbonitriding process, the carburizing process does not form nitrides, so that hardness cannot be obtained as compared with the carbonitriding process. Therefore, it is more effective to perform the carbonitriding process.

  According to the rolling bearing 10 described above, the lubricating oil 27 existing outside the bearing is lubricated by the oil repellent films 22 and 26 attached to the surfaces of the tip end portion of the seal plate 18 and the outer peripheral surface 12 of the inner ring 11. Does not get into the bearing space. As a result, the bearing is lubricated only by a small amount of oil by oil plating, and rolling friction is reduced. Further, since the amount of the lubricating oil is very small, the stirring resistance is reduced, and as a result, the bearing torque is reduced. Furthermore, a sufficient life can be ensured even with a minute amount of lubricating oil. Therefore, while maintaining the sealing performance inside the bearing, the sealing torque is eliminated, and the lubricant 27 outside the bearing is repelled by the oil-repellent films 22 and 26 containing the oil-repellent components that are not easily wetted by the lubricant 27, so that the foreign matter to the bearing space is removed. Therefore, the entire bearing can be lubricated by oil plating only, and the torque of the entire bearing can be reduced. Furthermore, a sufficient life can be ensured even with a minute amount of lubricating oil.

  Next, a second embodiment of the rolling bearing according to the present invention will be described with reference to FIGS. In addition, in each embodiment following 2nd Embodiment, about the member etc. which have the structure and effect | action similar to the member already demonstrated, description is simplified by attaching | subjecting the same code | symbol or an equivalent code | symbol in a figure. Omitted.

  As shown in FIG. 3, the rolling bearing 30 according to the second embodiment of the present invention has seal plate fixing portions 31, 31 for attaching the seal plates 18, 18 near both axial ends of the outer peripheral surface 12 of the inner ring 11. The oil repellent film 32 is provided on the outer peripheral edge of the seal plates 18, 18, and the oil repellent film 33 is provided on the inner peripheral surface 15 of the outer ring 14. The oil repellent films 32 and 33 contain components that are not easily wetted by the oil plating and external lubricating oil.

  An oil plating layer 21 with oil plating is formed on the surface of the inner ring raceway 13, and an oil plating layer 23 with oil plating is formed on the surface of the outer ring raceway 16. An oil plating layer 25 is formed on the surface of 17 by oil plating.

  As shown in FIG. 4, the rolling bearing 30 is formed outside the bearing by oil-repellent coatings 32 and 33 formed on the outer peripheral edge of the seal plate 18 and both axial ends of the inner peripheral surface 15 of the outer ring 14. Since the existing lubricating oil 27 is repelled and does not adhere to these portions, the lubricating oil 27 does not enter the bearing space. Thereby, the lubrication of the bearing is caused by a minute amount by the oil plating layer 21 in the inner ring raceway 13 of the inner ring 11, the oil plating layer 23 in the outer ring raceway 16 of the outer ring 14, and the oil plating layer 25 of the ball 17. Only oil will bear, and rolling friction will decrease. Further, since the amount of the lubricating oil is very small, the stirring resistance is reduced, and as a result, the bearing torque is reduced.

  According to the rolling bearing 30, the inner ring raceway 13, the outer ring raceway 16, and the balls 17 have the oil plating layers 21, 23, 25, and the oil repellent film 32 is formed on the outer peripheral edge portion of the seal plate 18 that faces each other in close contact with each other. Since the oil repellent film 33 is provided on the inner peripheral surface 15 of the outer ring 14, the lubricating oil 27 existing outside the bearing is separated from the oil repellent film 32 formed on the outer peripheral edge of the seal plate 18. By being repelled by the oil repellent film 33 formed on the inner peripheral surface 15 of the outer ring 14, it does not adhere to the outer peripheral edge of the seal plate 18 and the inner peripheral surface 15 of the outer ring 14 and does not enter the bearing space. As a result, the bearing is lubricated by only a small amount of oil from the oil plating applied to the inner ring raceway 13 of the inner ring 11, the outer ring raceway 16 of the outer ring 14, and the balls 17, thereby reducing rolling friction. To do. Further, since the amount of the lubricating oil is very small, the stirring resistance is reduced, and as a result, the bearing torque is reduced. Furthermore, a sufficient life can be ensured even with a minute amount of lubricating oil. As a result, the sealing torque is eliminated while maintaining the sealability inside the bearing, and the lubricating oil 27 outside the bearing is repelled by the oil repellent films 32 and 33 containing the oil repellent component that is difficult to be wetted by the lubricating oil 27 to the bearing space. It is possible to reduce the torque of the entire bearing by blocking the entry of foreign matter and only lubricating the inside of the bearing with oil plating, and a sufficient life can be ensured even with a minute amount of lubricating oil.

  Next, a third embodiment of the rolling bearing according to the present invention will be described with reference to FIG.

  As shown in FIG. 5, the rolling bearing 40 of the third embodiment of the present invention includes a seal plate fixing portion 24 for attaching seal plates 18, 18 near both axial ends of the inner peripheral surface 15 of the outer ring 14. 24, an oil plating layer 21 with oil plating is formed on the surface of the inner ring raceway 13, and an oil plating layer 23 with oil plating is formed on the surface of the outer ring raceway 16. An oil plating layer 25 is formed on the surface of the ball 17 by oil plating.

  Further, the rolling bearing 40 has an annular convex portion 42 formed by bending from the disc-shaped main body portion 41 toward the inside of the bearing at the inner peripheral edge portion of each seal plate 18. An oil repellent film 43 is formed on the outer surface in the axial direction of the seal plate 18, and an oil repellent film 44 is formed on the inner peripheral surface of the convex portion 42. Further, an oil repellent film 45 is formed on the outer peripheral surface 12 of the inner ring 11, and an oil repellent film 46 is formed on the end surface of the inner ring 11. Thus, the oil repellent film 44 on the seal plate 18 side and the repellent side on the inner ring 11 side are disposed between the inner peripheral surface of the convex portion 42 of the seal plate 18 facing each other in close contact with each other and the outer peripheral surface 12 of the inner ring 11. A labyrinth gap 47 surrounded by the oil film 45 in the axial direction can be formed. The oil repellent films 43, 44, 45, 46 contain components that are not easily wetted by the oil plating and external lubricating oil.

  According to the rolling bearing 40, the lubricating oil existing outside the bearing is in contact with the oil repellent film 43 formed on the outer surface in the axial direction of the seal plate 18 and the inner periphery of the convex portion 42 of the seal plate 18 that faces each other in close contact with each other. It is repelled by the oil repellent film 44 formed on the surface, the oil repellent film 45 formed on the outer peripheral surface 12 of the inner ring 11, and the oil repellent property 46 formed on the end face of the inner ring 11. And does not adhere to the outer peripheral surface 12 of the inner ring 11 and the end face of the inner ring 11 and does not enter the bearing space. When the load is applied, the inner and outer rings 11 and 14 and the ball 17 are elastically deformed, or the gap inside the bearing becomes large, and the gap in the non-contact portion becomes large, making it difficult to play the lubricating oil. Even so, the lubricating oil can be reliably repelled. As a result, it is possible to more reliably prevent the lubricating oil from entering the outside of the bearing, so that the lubricating oil outside the bearing does not enter the inside of the bearing. Bearing torque can be reduced by plating. Furthermore, a sufficient life can be ensured even with a minute amount of lubricating oil. As a result, while eliminating the sealing torque while maintaining the sealing performance inside the bearing, the bearing space is repelled by the lubricating oil outside the bearing by the oil repellent films 43, 44, 45, and 46 containing the oil repellent component that is not easily wetted by the lubricating oil. By blocking the intrusion of foreign matter into the bearing and only lubricating the inside of the bearing with oil plating, the torque of the entire bearing can be reduced, and a sufficient life can be secured even with a small amount of lubricating oil .

  Further, according to the rolling bearing 40, since the annular convex portion 42 provided on the outer peripheral edge portion of the seal plate 18 is disposed opposite to the outer peripheral surface 12 of the inner ring 11, the convex portion 42 of the seal plate 18 and the inner ring 11 can be reliably formed between the outer peripheral surface 12 and the sealing performance can be further improved, and the seal plate 18 is non-contacted. An increase can be avoided.

  Next, with reference to FIG. 6, 4th Embodiment of the rolling bearing which concerns on this invention is described.

  As shown in FIG. 6, the rolling bearing 50 according to the fourth embodiment of the present invention includes a seal plate fixing portion 24 for attaching seal plates 18, 18 near both axial ends of the inner peripheral surface 15 of the outer ring 14. 24, an oil plating layer 21 with oil plating is formed on the surface of the inner ring raceway 13, and an oil plating layer 23 with oil plating is formed on the surface of the outer ring raceway 16. An oil plating layer 25 is formed on the surface of the ball 17 by oil plating.

  Further, the rolling bearing 50 has step portions 51 and 51 for accommodating the inner peripheral edge portion of the seal plate 18 on both axial sides of the outer peripheral surface 12 of the inner ring 11. An oil repellent film 52 is formed on the outer surface of the seal plate 18 in the axial direction, an oil repellent film 53 is formed on the inner peripheral surface of the convex portion 42, and the bearing inner side of the main body 41 of the seal plate 18 is further formed. An oil repellent film 54 is formed.

  An oil repellent film 55 is formed on the outer peripheral surface 12 of the inner ring 11, an L-shaped oil repellent film 56 is formed on the outer surface of the step portion 51 of the inner ring 11, and an oil repellent film is formed on the end surface of the inner ring 11. 57 is formed. The oil repellent films 52, 53, 54, 55, 56, and 57 contain components that are not easily wetted by oil plating and external lubricating oil.

  Thereby, the first labyrinth gap 58 is formed between the inner peripheral surface of the convex portion 42 of the seal plate 18 and the step portion 51 of the inner ring 11, and the main body portion 41 of the seal plate 18 and the inner ring 11 are A second labyrinth gap 59 is formed between the step 51 and the first labyrinth gap 58 so as to communicate with the first labyrinth gap 58 in an L shape in cross section. The first labyrinth gap 58 is surrounded in the axial direction by the oil repellent film 53 on the seal plate 18 side and the oil repellent film 56 on the stepped portion 51 side of the inner ring 11, and the second labyrinth gap 59 is formed on the seal plate 18. The oil repellent film 54 on the main body 41 side and the oil repellent film 56 on the stepped portion 51 side of the inner ring 11 are surrounded in the radial direction.

  According to the rolling bearing 50, the lubricating oil existing outside the bearing is separated from the oil repellent film 52 formed on the outer surface in the axial direction of the seal plate 18 and the oil repellent film of the convex portion 42 of the seal plate 18 facing each other in close contact with each other. 53 and the oil repellent film 56 of the step 51 of the inner ring 11, the oil repellent film 54 of the main body 41 of the seal plate 18 facing each other in close contact with each other, the oil repellent film 56 of the step 51 of the inner ring 11, and the end face of the inner ring 11. By being repelled by the oil repellent film 57 and the oil repellent film 55 on the outer peripheral surface 12 of the inner ring 11, the outer surface of the seal plate 18, the inner peripheral edge of the seal plate 18, and the end surface of the inner ring 11 are not attached to the bearing space. Do not enter. When the load is applied, the inner and outer rings 11 and 14 and the ball 17 are elastically deformed, or the gap inside the bearing becomes large, and the gap in the non-contact portion becomes large, making it difficult to play the lubricating oil. Even so, the lubricating oil can be reliably repelled. As a result, it is possible to more reliably prevent the lubricating oil from entering the outside of the bearing, so that the lubricating oil outside the bearing does not enter the inside of the bearing. Bearing torque can be reduced by plating. Furthermore, a sufficient life can be ensured even with a minute amount of lubricating oil. As a result, the sealing torque is eliminated while maintaining the sealability inside the bearing, and the lubricating oil outside the bearing is removed by the oil repellent films 52, 53, 54, 55, 56 and 57 containing the oil repellent component which is difficult to get wet with the lubricating oil. Bounce to prevent foreign matter from entering the bearing space and reduce the torque of the entire bearing by lubricating the inside of the bearing only with oil plating. In addition, even a small amount of lubricating oil ensures a sufficient life. can do.

  Next, with reference to FIG. 7, 5th Embodiment of the rolling bearing which concerns on this invention is described.

  As shown in FIG. 7, the rolling bearing 60 of the fifth embodiment of the present invention includes a seal plate fixing portion 24 for attaching seal plates 18, 18 near both axial ends of the inner peripheral surface 15 of the outer ring 14. 24, an oil plating layer 21 with oil plating is formed on the surface of the inner ring raceway 13, and an oil plating layer 23 with oil plating is formed on the surface of the outer ring raceway 16. An oil plating layer 25 is formed on the surface of the ball 17 by oil plating.

  Further, the rolling bearing 60 has seal plate housing recesses 61 and 61 formed in a U shape in cross section so as to surround the convex portion 42 of the seal plate 18 on both axial sides of the outer peripheral surface 12 of the inner ring 11. The oil repellent film 62 is formed on the outer surface in the axial direction of the seal plate 18, the oil repellent film 63 is formed on the inner peripheral surface of the convex portion 42, and the oil repellent film is formed on the tip surface of the convex portion 42 of the seal plate 18. 64, an oil repellent film 65 is formed on the outer peripheral surface of the convex portion 42, and an oil repellent film 66 is formed on the bearing inner side surface of the main body 41 of the seal plate 18.

  An oil repellent film 67 is formed on the outer peripheral surface 12 of the inner ring 11, an oil repellent film 68 is formed on the protruding end surface of the seal plate housing recess 61 of the inner ring 11, and the protruding side surface of the seal plate storing recess 61 of the inner ring 11 is further formed. The oil repellent film 69 is formed, the oil repellent film 70 is formed on the radial side surface of the seal plate housing recess 61 of the inner ring 11, and the oil repellent film 71 is formed on the axial side surface of the seal plate housing recess 61 of the inner ring 11. In addition, an oil repellent film 72 is formed on the end face of the inner ring 11. The oil repellent films 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72 contain components that are difficult to get wet with oil plating and external lubricating oil.

  As a result, a first labyrinth gap 73 is formed between the inner peripheral surface of the convex portion 42 of the seal plate 18 and the axial side surface of the seal plate housing concave portion 61 of the inner ring 11, and the convex portion of the seal plate 18. A second labyrinth gap 74 is formed between the front end surface of 42 and the radial side surface of the seal plate housing recess 61, and the outer peripheral surface of the projection 42 of the seal plate 18 and the seal plate housing recess of the inner ring 11. A third labyrinth gap 75 is formed between the projecting side surface of 61 and a bearing inner side surface of the main body 41 of the seal plate 18 and a projecting end surface of the seal plate housing recess 61 of the inner ring 11. A four labyrinth gap 76 is formed.

  The first labyrinth gap 73 is surrounded by the oil repellent film 63 on the seal plate 18 side and the oil repellent film 71 on the seal ring housing recess 61 side of the inner ring 11, and the second labyrinth gap 74 is formed on the seal plate The oil repellent film 64 on the 18 side and the oil repellent film 70 on the seal plate housing recess 61 side of the inner ring 11 are surrounded in the radial direction, and the third labyrinth gap 75 is formed between the oil repellent film 65 on the seal plate 18 side and the inner ring 11. The oil repellent film 69 on the seal plate housing recess 61 side is surrounded by the axial direction, and the fourth labyrinth gap 76 is formed between the oil repellent film 66 on the seal plate 18 side and the oil repellent film 68 on the seal plate housing recess 61 side of the inner ring 11. As a result, the labyrinth gap connected in a cross-sectionally U-shape is formed.

  According to the rolling bearing 60, the lubricating oil existing outside the bearing is separated from the oil repellent film 62 formed on the outer surface in the axial direction of the seal plate 18 and the oil repellent film of the convex portion 42 of the seal plate 18 facing each other in close contact with each other. 63 and the oil repellent film 71 of the seal ring housing recess 61 of the inner ring 11, the oil repellent film 64 of the convex part 42 of the seal plate 18 facing each other in close contact with each other, and the oil repellent film 70 of the seal ring housing recess 61 of the inner ring 11 and The oil-repellent film 65 of the convex portion 42 of the seal plate 18 facing in a non-contact manner and the oil-repellent film 69 of the seal plate housing recess 61 of the inner ring 11 and the oil-repellent film 66 of the main body portion 41 of the seal plate 18 facing each other in a non-contact manner. And the oil repellent film 68 of the seal plate housing recess 61 of the inner ring 11, the oil repellent film 72 on the end surface of the inner ring 11, and the oil repellent film 67 of the outer peripheral surface 12 of the inner ring 11, Sea It does not enter into the bearing space without adhering to the end face of the inner peripheral edge portion and the inner ring 11 of the plate 18. When the load is applied, the inner and outer rings 11 and 14 and the ball 17 are elastically deformed, or the gap inside the bearing becomes large, and the gap in the non-contact portion becomes large, making it difficult to play the lubricating oil. Even so, the lubricating oil can be reliably repelled. As a result, it is possible to more reliably prevent the lubricating oil from entering the outside of the bearing, so that the lubricating oil outside the bearing does not enter the inside of the bearing. Bearing torque can be reduced by plating. Furthermore, a sufficient life can be ensured even with a minute amount of lubricating oil. As a result, the oil repellent films 62, 63, 64, 65, 66, 67, 68, 69, 70, which contain oil repellent components that are difficult to get wet with the lubricating oil, while eliminating the sealing torque while maintaining the sealability inside the bearing. 71, 72 repels the lubricating oil outside the bearing to block the entry of foreign matter into the bearing space, and only the lubrication inside the bearing is lubricated by oil plating, so that the torque of the entire bearing can be reduced. A sufficient service life can be ensured even with the lubricating oil.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. For example, the seal plate may be of a non-contact type, and can be used without any particular limitation, for example, made of rubber, metal or plastic. A seal plate in which a resin is molded around the core metal may be used.

  Further, in the third, fourth, and fifth embodiments, the present invention can also be applied to a case where the seal plate is attached and fixed to the inner ring and the outer peripheral edge portion is in non-contact with the outer ring. Of course, in those cases, the convex portion is formed on the outer ring side.

  Further, the shape of the labyrinth gap is not limited to the illustrated shapes, and can be various shapes other than these shapes as long as a sealing force can be obtained.

  Moreover, as a rolling bearing, it is not restricted to what was illustrated, You may apply this invention to various bearings, such as a type without a retainer, and a roller bearing.

It is sectional drawing of 1st Embodiment of the rolling bearing which concerns on this invention. It is the elements on larger scale of the rolling bearing shown in FIG. It is sectional drawing of 2nd Embodiment of the rolling bearing which concerns on this invention. It is the elements on larger scale of the rolling bearing shown in FIG. It is sectional drawing of 3rd Embodiment of the rolling bearing which concerns on this invention. It is sectional drawing of 4th Embodiment of the rolling bearing which concerns on this invention. It is sectional drawing of 5th Embodiment of the rolling bearing which concerns on this invention. It is sectional drawing of the conventional rolling bearing.

Explanation of symbols

10, 30, 40, 50, 60 Rolling bearing 11 Inner ring 12 Outer peripheral surface 13 Inner ring raceway 14 Outer ring 15 Inner peripheral surface 16 Outer ring raceway 17 Ball (rolling element)
18 Seal plate 21, 23, 25 Oil plating layer 22, 26 Oil repellent film 27 Lubricating oil 32, 33 Oil repellent film 43, 44 Oil repellent film 45, 46 Oil repellent film 52, 53, 54 Oil repellent film 55, 56, 57 Oil repellent film 62 , 63, 64, 65, 66 Oil repellent film 67, 68, 69, 70, 71, 72 Oil repellent film

Claims (2)

An inner ring having an inner ring raceway on the outer peripheral surface, an outer ring having an outer ring raceway on the inner peripheral surface, a rolling element disposed so as to be able to roll between the inner ring raceway and the outer ring raceway, and a base end portion with respect to the rolling element A rolling bearing having a seal plate mounted on both sides in the axial direction and having a tip portion that is close to and non-contacting with either one of the outer peripheral surface of the inner ring or the inner peripheral surface of the outer ring,
Oil plating is applied to at least one of the inner ring raceway, the outer ring raceway, and the rolling element,
An oil repellent film is formed on at least one of the seal tip, or the outer peripheral surface of the inner ring or the inner peripheral surface of the outer ring facing the seal tip.   The rolling element according to claim 1, wherein at least the rolling element is subjected to high temperature tempering after carbonitriding and quenching using steel having a Si content of 0.5 wt% or more. Rolling bearing.

Images