JP2005325868A - Rolling bearing unit with sealing unit and rolling bearing with sealing plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain a longer life of a bearing by applying rustproof measures on a seal lip sliding surface and its vicinity. <P>SOLUTION: In the sealing unit 14a (namely, a pack seal) shown by a dotted line(a broken line), surface treatment with corrosion-resistant and anticorrosive capability is applied on a metallic surface of a slinger 16 sliding with seal lips 22-24, and the same surface treatment is also applied on metallic surfaces of neighboring components (such as an outer ring 1 and an inner ring element 5) mounting the sealing unit 14a. In the sealing unit 14b such as (a three-piece lip seal), surface treatment with corrosion-resistant and anticorrosive capability is applied on metallic surfaces of intermediate outer peripheral surfaces of a mounting flange 9 and a hub body 4 which bring into slide contact with seal lips 29-31, and the same surface treatment is also applied on neighboring components (such as the outer ring 1 and hub body 4, for instance) mounting the sealing unit 14b. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a rolling bearing unit with a sealing device used for a rolling bearing unit used for an automobile wheel or the like, and an automobile installed in an engine room such as an alternator, a compressor, an idler pulley, and the like. A rolling bearing used for constituting a rotation support part of an auxiliary machine for machinery and the like. More specifically, it prevents dust, water, etc. from entering the bearing that supports the rotation shaft, The present invention relates to a rolling bearing with a sealing plate provided with a sealing device for improving the reliability and durability of the rolling bearing with a sealing plate that prevents leakage of grease.

  Rolling bearings such as ball bearings, cylindrical roller bearings, and tapered roller bearings are incorporated in the rotation support portions of various mechanical devices. Such a rolling bearing incorporates a sealing device to prevent various foreign matters such as rainwater, mud, and dust existing outside from entering the rolling bearing.

  FIG. 8 shows a structure for rotatably supporting a driving wheel of a vehicle on a suspension device as an example of a rolling bearing unit with a sealing device provided with such a sealing device.

  The rolling bearing unit with a sealing device includes an outer ring 1, a hub 2 corresponding to the inner ring described in the claims, and a plurality of rolling elements 3 and 3. Of these, the hub 2 is formed by combining a hub body 4 and an inner ring element 5. Each of the rolling elements 3, 3 includes a double-row outer ring raceway 6, 6 formed on the inner peripheral surface of the outer ring 1 and a double-row inner ring raceway 7, 7 formed on the outer peripheral surface of the hub 2. A plurality of them are provided so as to roll freely. In use, that is, when the wheel is rotatably supported by the vehicle suspension device, the outer ring 1 is fixed to the knuckle 8 constituting the suspension device, and the wheel is coupled to the mounting flange 9 provided on the hub body 4. Fix it.

  Further, since the structure shown in FIG. 8 is a structure for supporting the drive shaft, the spline shaft 12 attached to the constant velocity joint 11 is engaged with the spline hole 10 provided in the central portion of the hub body 4. .

  Among the rolling bearing units with a sealing device as described above, between the inner peripheral surface of both ends of the outer ring 1 and the outer peripheral surface of the inner end portion of the inner ring element 5 and the outer peripheral surface of the intermediate portion of the hub body 4, Sealing devices 14a and 14b are respectively provided to close both end openings of the internal space 13.

  Of the two sealing devices 14a and 14b, the inner end of the inner space 13 (inner with respect to the axial direction means the side that is closer to the middle in the width direction of the vehicle when assembled to the vehicle, that is, the right side in FIG. On the other hand, the outer side in the width direction of the vehicle, that is, the left side in FIG. 8 is referred to as the outside, and the same applies to the entire specification.) The sealing device 14a for closing the opening is configured as shown in FIG. doing.

  The sealing device 14a (that is, pack seal) is called a combination sealing device, and includes a cored bar 15, a slinger 16, and a sealing material 17. Of these, the core metal 15 is bent inward in the diameter direction from the outer diameter side cylindrical portion 18 that can be fitted and fixed to the inner peripheral surface of the end portion of the outer ring 1, and from the outer edge in the axial direction of the outer diameter side cylindrical portion 18. The outer ring portion 19 is provided with an L-shaped cross section, and the whole is an annular shape.

  The slinger 16 includes an inner diameter side cylindrical portion 20 that can be fitted and fixed to the outer peripheral surface of the end portion of the inner ring element 5, and an inner side that is bent outward in the diameter direction from the axial inner end edge of the inner diameter side cylindrical portion 20. The whole is an annular shape with an L-shaped cross section including an annular portion 21.

  The seal material 17 is made of an elastic material such as an elastomer such as rubber, and includes three seal lips 22 to 24, and the base end portion is coupled and fixed to the core metal 15. Then, the end edge of the seal lip 22, which is called a side lip and is provided on the outermost diameter side so as to protrude inward in the axial direction, is arranged around the outer surface of the inner ring portion 21 constituting the slinger 16. The tip edges of the remaining two seal lips 23 and 24 are in sliding contact with the outer peripheral surface of the inner diameter side cylindrical portion 20 constituting the slinger 16 over the entire circumference.

  On the other hand, a seal sigbing 14b (that is, a three-lip seal) for closing the outer end side opening of the internal space 13 is composed of a core metal 27 and a seal material 28, as shown in FIG. The sealing material 28 is made of an elastic material such as an elastomer such as rubber, and includes three sealing lips 29 to 31, and the base end portion is coupled and fixed to the core metal 27. Then, the tip edge of the seal lip 29, which is called the side lip and protrudes outward in the axial direction on the outermost diameter side, is slid over the entire inner surface of the base end portion of the mounting flange 9. The leading edges of the remaining two seal lips 30 and 31 are slid over the entire circumference from the continuous portion of the inner surface of the base end portion to the outer peripheral surface of the intermediate portion of the hub body 4 or the outer peripheral surface of the intermediate portion. Touching.

  By closing the openings at both ends of the internal space 13 with the sealing devices 14a and 14b as described above, foreign matter such as muddy water is prevented from entering the internal space 13.

  Incidentally, automobile wheel bearings are directly exposed to the external environment, and sealing devices mounted on both sides are exposed to external mud, sand, muddy water, and water containing salt such as a snow melting agent and seawater. Therefore, with use, the wheel bearings for automobiles are likely to be rusted.

  If the metal surface on which the seal lip slides rusts, the seal lip wears due to the rust, or a gap is generated between the seal lip and the sliding contact surface, reducing the sealing performance and smoothing the wheel bearings for automobiles. May interfere with proper rotation.

  Also, if rust is generated in the part where the sealing device is installed, the rust advances and enters the inside of the fitting surface where the sealing device is fixed. Muddy water, water, etc. may enter and hinder smooth rotation of automobile wheel bearings.

  As the rust further progresses, the rust falls off as small pieces, and the small pieces of rust are caught between the seal lip of the sealing device and the metal surface that is the sliding contact surface, and the seal lip and the metal surface are extremely worn. In some cases, the sealing performance is impaired, and the smooth rotation of the automotive wheel bearing may be hindered.

  In patent document 1, the metal ring which a seal lip slidably contacts is using the non-rusting member, and the sealing performance fall by rusting a seal lip slidable contact surface is suppressed.

  Further, in Patent Document 2, the metal surface with which the seal lip is slidably contacted is subjected to a hardening treatment or a hard film treatment having corrosion resistance and rust resistance, thereby suppressing a decrease in sealing performance due to rusting of the seal lip slidable contact surface. .

  By the way, for example, a rolling bearing 51 with a sealing plate as shown in FIG. 13 is used to constitute a rotation support portion of various mechanical devices such as an alternator and a compressor.

  The rolling bearing 51 with a sealing plate is provided between an outer ring 53 having an outer ring raceway 52 on an inner peripheral surface, an inner ring 55 having an inner ring raceway 54 on an outer peripheral surface, and the outer ring raceway 52 and the inner ring raceway 54 so as to be freely rollable. A plurality of rolling elements 56 and a retainer 60 that holds the rolling elements 56 in a freely rollable manner. Further, a sealing plate 57 is provided between both ends of the inner peripheral surface of the outer ring 53 and both ends of the outer peripheral surface of the inner ring 55, and the axial direction of the space 58 in which the rolling elements 56 are provided by the sealing plate 57. The openings at both ends are closed.

  Then, grease is sealed in the space 58 to lubricate the rolling contact portion between the outer ring raceway 52 and the inner ring raceway 54 and the rolling surfaces of the rolling elements 56.

  The sealing plate 57 includes a metal core 59 formed by forming a metal plate such as a steel plate into an annular shape, and an elastic material 62 reinforced by the metal core 59. Both the inner and outer peripheral edges of the elastic member 62 protrude in the diameter direction from the inner and outer peripheral edges of the core metal 59. Such a sealing plate 57 engages both ends in the axial direction of the space 58 by engaging the outer peripheral side peripheral portion of the elastic member 62 with engaging grooves 61 formed at both end portions of the inner peripheral surface of the outer ring 53. Supporting position.

  The inner peripheral edge of the elastic member 62 constitutes a rolling bearing 51 with a sealing plate sealed with grease as described above, which is in sliding contact with both ends of the outer peripheral surface of the inner ring 55. As the material of the elastic member 62 constituting the sealing plate 57, conventionally, nitrile rubber, hydrogenated nitrile rubber, acrylic rubber, fluorine rubber or the like is generally used depending on the use temperature.

  Further, automobile auxiliary machines (compressors, alternators) and the like installed in the engine room of the automobile are driven by the rotation of the engine by pulleys and belts, and rolling bearings are used for the pulls used there.

  Due to the conditions of use, water, mud, etc. will fall during operation. Particularly in recent years, rolling bearings are increasingly used in an exposed state due to the effects of downsizing and weight reduction and cost reduction.

  In such a case, water, muddy water or the like falls directly on the bearing, and if it enters the bearing, it may cause problems such as a decrease in bearing life. Other than the auxiliary equipment installed around the engine of the automobile, the same problem may be caused particularly in rotating equipment used outdoors.

  Rolling bearings used under the above severe conditions are means for preventing foreign matter from entering (water, muddy water, etc.) from the outside of the bearing, means for preventing leakage of grease, oil, etc. from the inside of the bearing, or As a means for preventing both, a contact-type seal is used.

  However, when water / muddy water or the like falls on the bearing many times, rust is also generated on the inner ring sliding surface and the outer ring fitting surface. Therefore, a gap is generated between the seal lip portion and the inner ring sliding surface and between the seal outer diameter portion and the outer ring fitting surface. When the bearing rotates, the rust generated on the sliding surface of the inner ring causes cutting / wearing at the tip of the seal lip. As a result, water and muddy water enter the bearing, or grease, oil, etc. inside the bearing. Leakage occurs and the bearing life is rapidly reduced.

  In patent document 1, the metal ring which a seal lip part slidably contacts is using the non-rusting member, and the sealing performance fall by rusting a seal lip sliding surface is suppressed.

Further, in Patent Document 2, the metal surface with which the seal lip portion is slidably contacted is subjected to a hardening treatment or a hard film treatment having corrosion resistance and rust resistance, thereby suppressing deterioration in sealing performance due to rusting of the seal lip sliding surface. Yes.
JP 2003-56577 A JP 2003-262231 A

  In both Patent Documents 1 and 2 described above, the metal surface with which the seal lip is slidably contacted is less likely to rust, thereby ensuring sealing performance.

  However, as described above, when a small piece of rust generated in the vicinity of the sealing device is bitten into the sealing device, it is difficult to ensure sealing performance.

  Further, when the outer ring is used for rotation, due to centrifugal force, grease, oil, etc. inside the bearing may leak from between the seal outer diameter part and the outer ring fitting part.

  For this reason, it is extremely important to take measures against leakage of grease and oil between the seal outer diameter portion and the outer ring fitting portion, and rust generation on the outer ring fitting surface must be prevented. From this point of view, it is not sufficient to take measures only for the seal lip portion and the inner ring sliding surface, and Patent Documents 1 and 2 do not focus on the seal outer diameter portion and the outer ring fitting surface.

  The present invention has been made in view of the above-described circumstances, and a sealing device capable of extending the life of a bearing by applying a rust preventive measure to the seal lip sliding contact surface or the vicinity thereof. It is an object of the present invention to provide a rolling bearing unit with a rolling plate and a rolling bearing with a sealing plate.

In order to achieve the above object, in the rolling bearing unit with a sealing device according to claim 1 of the present invention, the seal lip provided on the seal member fixed to one of the outer ring or the inner ring is opposed to the other of the outer ring or the inner ring. In a rolling bearing unit with a sealing device provided with a sealing device configured to slidably contact a metal surface,
The metal surface with which the seal lip is slidably contacted is subjected to a surface treatment having corrosion resistance and corrosion resistance, and
A surface treatment having corrosion resistance and corrosion resistance is also extended on the metal surface in the vicinity where the sealing device is mounted.

A rolling bearing with a sealing plate according to claim 2 of the present invention includes a contact-type sealing plate between an outer ring and an inner ring on both side surfaces, and either the inner diameter side or the outer diameter side of the sealing plate is fixed, In a rolling bearing with a sealing plate that slides and maintains sealing performance,
Surface coating treatment with corrosion resistance and rust resistance is provided on both the sliding surface where the sealing plate contacts and slides on the bearing raceway and the mating surface where the sealing plate is fitted and locked to the bearing raceway. It is characterized by being given.

  As described above, according to the present invention, the metal surface with which the seal lip is slidably contacted is subjected to surface treatment having corrosion resistance and corrosion resistance, and the metal surface in the vicinity where the sealing device is mounted is also applied. Since the surface treatment with corrosion resistance and anticorrosion is extended, the metal surface with which the seal lip slides is not rusted even when exposed to water containing salt such as mud, sand, muddy water, snow melting agent or seawater. The seal lip is not worn by the rust, or a gap is generated between the seal lip and the sliding contact surface, so that the sealing performance is not deteriorated. Further, since rust does not occur in the portion where the sealing device is mounted, a minute gap is generated on the fitting surface that fixes the sealing device, so that muddy water or water does not enter the bearing. Furthermore, since the rust pieces that fall off do not occur, the rust pieces are caught between the seal lip of the sealing device and the metal surface that is the sliding contact surface, and the seal lip and the metal surface are not worn extremely, Smooth rotation of the wheel bearing for automobiles can be maintained over a long period of time.

  Surface coating with corrosion resistance and rust prevention on both the sliding surface where the sealing plate contacts and slides with the bearing raceway and the mating surface where the sealing plate is fitted and locked to the bearing raceway Prevents the occurrence of rust on the inner ring sliding surface where the tip of the seal lip slides and the outer ring fitting surface where the seal outer diameter part is fitted and locked, the seal lip part and the inner ring sliding surface, In addition, there is no gap between the outer diameter of the sealing plate and the outer ring mating surface, and even when the bearing is rotating or stationary, water and muddy water can be prevented from entering the bearing. Etc., and further, it is possible to prevent the bearing life from being shortened due to wear / cut of the seal lip. Furthermore, in the case of outer ring rotation, it is possible to prevent water and muddy water from entering the bearing, and to prevent leakage of grease, oil, etc. inside the bearing.

  Hereinafter, a rolling bearing unit with a sealing device and a rolling bearing with a sealing plate according to an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a longitudinal sectional view of a rolling bearing unit with a sealing device according to a first embodiment of the present invention. FIG. 2 is a partially enlarged cross-sectional view of the sealing device assembled to part A of FIG. FIG. 3 is a partially enlarged cross-sectional view of the sealing device assembled to part B of FIG.

  The rolling bearing unit with a sealing device includes an outer ring 1, a hub 2 corresponding to the inner ring recited in the claims, and a plurality of rolling elements 3 and 3. Of these, the hub 2 is formed by combining a hub body 4 and an inner ring element 5. Each of the rolling elements 3, 3 includes a double-row outer ring raceway 6, 6 formed on the inner peripheral surface of the outer ring 1 and a double-row inner ring raceway 7, 7 formed on the outer peripheral surface of the hub 2. A plurality of them are provided so as to roll freely. In use, that is, when the wheel is rotatably supported by the vehicle suspension device, the outer ring 1 is fixed to the knuckle 8 constituting the suspension device, and the wheel is coupled to the mounting flange 9 provided on the hub body 4. Fix it.

  Further, since the structure shown in FIG. 1 is a structure for supporting the drive shaft, the spline shaft 12 attached to the constant velocity joint 11 is engaged with the spline hole 10 provided in the central portion of the hub body 4. .

  Among the rolling bearing units with a sealing device as described above, between the inner peripheral surface of both ends of the outer ring 1 and the outer peripheral surface of the inner end portion of the inner ring element 5 and the outer peripheral surface of the intermediate portion of the hub body 4, Sealing devices 14a and 14b are respectively provided to close both end openings of the internal space 13.

  Of the two sealing devices 14a and 14b, the inner end of the inner space 13 (inner with respect to the axial direction means the side that is closer to the middle in the width direction of the vehicle when assembled to the vehicle, that is, the right side in FIG. On the other hand, the outer side in the width direction of the vehicle, that is, the left side in FIG. 1 is referred to as the outside, and the same applies to the entire specification.) The sealing device 14a for closing the opening is configured as shown in FIG. doing.

  The sealing device 14a (that is, pack seal) is called a combination sealing device, and includes a cored bar 15, a slinger 16, and a sealing material 17. Of these, the core metal 15 is bent inward in the diameter direction from the outer diameter side cylindrical portion 18 that can be fitted and fixed to the inner peripheral surface of the end portion of the outer ring 1, and from the outer edge in the axial direction of the outer diameter side cylindrical portion 18. The outer ring portion 19 is provided with an L-shaped cross section, and the whole is an annular shape.

  The slinger 16 includes an inner diameter side cylindrical portion 20 that can be fitted and fixed to the outer peripheral surface of the end portion of the inner ring element 5, and an inner side that is bent outward in the diameter direction from the axial inner end edge of the inner diameter side cylindrical portion 20. The whole is an annular shape with an L-shaped cross section including an annular portion 21.

  The seal material 17 is made of an elastic material such as an elastomer such as rubber, and includes three seal lips 22 to 24, and the base end portion is coupled and fixed to the core metal 15. Then, the end edge of the seal lip 22, which is called a side lip and is provided on the outermost diameter side so as to protrude inward in the axial direction, is arranged around the outer surface of the inner ring portion 21 constituting the slinger 16. The tip edges of the remaining two seal lips 23 and 24 are in sliding contact with the outer peripheral surface of the inner diameter side cylindrical portion 20 constituting the slinger 16 over the entire circumference.

  On the other hand, the seal srig 14b (that is, the three-lip seal) that closes the outer end side opening of the internal space 13 is composed of a core metal 27 and a seal material 28, as shown in FIG. The sealing material 28 is made of an elastic material such as an elastomer such as rubber, and includes three sealing lips 29 to 31, and the base end portion is coupled and fixed to the core metal 27. Then, the tip edge of the seal lip 29, which is called the side lip and protrudes outward in the axial direction on the outermost diameter side, is slid over the entire inner surface of the base end portion of the mounting flange 9. The leading edges of the remaining two seal lips 30 and 31 are slid over the entire circumference from the continuous portion of the inner surface of the base end portion to the outer peripheral surface of the intermediate portion of the hub body 4 or the outer peripheral surface of the intermediate portion. Touching.

  By closing the openings at both ends of the internal space 13 with the sealing devices 14a and 14b as described above, foreign matter such as muddy water is prevented from entering the internal space 13.

  Now, in the present embodiment, as shown by dotted lines (broken lines) in FIGS. 1 and 2, in the sealing device 14a (that is, pack seal), the metal surface of the slinger 16 with which the seal lips 22 to 24 are slidably contacted has corrosion resistance. In addition, a surface treatment with anticorrosion and anticorrosion is extended to the metal surface in the vicinity (for example, the outer ring 1 and the inner ring element 5) to which the sealing device 14a is attached. It is.

  Further, as shown by dotted lines (broken lines) in FIGS. 1 and 3, in the sealing device 14b (that is, three lip seals), the mounting flange 9 and the outer peripheral surface of the intermediate portion of the hub body 4 with which the seal lips 29 to 31 are slidably contacted. The surface of the metal is subjected to a surface treatment with corrosion resistance and corrosion resistance, and the metal surface in the vicinity (for example, the outer ring 1 and the hub body 4) to which the sealing device 14b is attached also has corrosion resistance and corrosion resistance. Surface treatment is extended.

  In addition, as shown with the dotted line (broken line) in FIG. 1, the area | region where the surface treatment with corrosion resistance and anticorrosion property is performed is set sufficiently wide, and the vertical (outside air side) vertical of the sealing devices 14a and 14b. It is applied to the directional surface and the axial surface in contact with the surface. Since the state of the vicinity of the sealing devices 14a and 14b changes depending on the type and shape of the wheel bearings for automobiles, the setting area of the surface treatment can be arbitrarily set. However, the portion where rust is likely to occur is sufficient from the sealing devices 14a and 14b. However, it is necessary that the rust pieces that have fallen off do not reach the sealing device.

  In addition, surface treatment with corrosion resistance and anticorrosion includes zinc plating, unichrome plating, chromate plating, nickel plating, chrome plating, electroless nickel plating, kanzen plating, iron trioxide coating (black dyeing), raydent, cationic electrodeposition Coating, anion electrodeposition coating, ceramic coating such as silicon nitride, etc. can be set.

It is also possible to use a coating such as TiN, TiC, TiCN, SiC, TiAlN, Al ₂ O ₃ , TiAl ₂ N, diamond, DLC, cBN, CrN, ZrN, and HfN by PVD or CVD. Yes, it can be set arbitrarily depending on the material of the target base material.

(Application of the first embodiment)
The basic structure of the rolling bearing unit with a sealing device can be applied not only to the inner ring rotating structure as shown in FIG. 1 but also to the outer ring rotating structure.

  Further, the present invention is not limited to the so-called third generation hub unit in which the inner ring raceway 7 is directly formed on the hub body 4 as shown in FIG. 1, but the so-called first generation hub unit as shown in FIG. It can also be applied to second generation hub units as shown in 5-7. Furthermore, the present invention is not limited to a structure using balls as rolling elements, but can be applied to a hub unit using tapered rollers as rolling elements. Of course, the present invention can also be applied to a structure in which the rolling elements are changed from balls to tapered rollers in the first generation and third generation hub units.

  FIG. 4 is a cross-sectional view of an example of a rolling bearing unit with a sealing device to which the present invention is applied. The metal surface in the vicinity of the portion where the sealing device is mounted is subjected to a surface treatment having corrosion resistance and corrosion resistance (portion indicated by a dotted line in the figure).

  FIG. 5 is a cross-sectional view of another example of a rolling bearing unit with a sealing device to which the present invention is applied. The metal surface in the vicinity of the portion where the sealing device is mounted is subjected to a surface treatment having corrosion resistance and corrosion resistance (portion indicated by a dotted line in the figure).

  FIG. 6 is a cross-sectional view of another example of a rolling bearing unit with a sealing device to which the present invention is applied. The metal surface in the vicinity of the portion where the sealing device is mounted is subjected to a surface treatment having corrosion resistance and corrosion resistance (portion indicated by a dotted line in the figure).

  FIG. 7 is a cross-sectional view of another example of a rolling bearing unit with a sealing device to which the present invention is applied. The metal surface in the vicinity of the portion where the sealing device is mounted is subjected to a surface treatment having corrosion resistance and corrosion resistance (portion indicated by a dotted line in the figure).

(Second Embodiment)
The rolling bearing with a sealing plate according to the present embodiment has the same structure as that of the rolling bearing with a sealing plate 51 shown in FIG.

  In the present embodiment, for example, both the sliding surface that contacts and slides with the rotating inner ring 55 and the mating surface that locks the sealing plate 57 to the locking groove 61 of the outer ring 53, Surface coating treatment with corrosion resistance and rust prevention is applied.

  Therefore, rust is generated on the sliding surface of the inner ring 53 on which the tip of the seal lip 63 of the elastic material 62 of the sealing plate 57 slides and on the outer ring fitting surface of the locking groove 61 that locks the outer diameter portion of the sealing plate 57. Can be prevented.

  In addition, no gap is generated between the sliding surface of the seal lip 63 and the inner ring 53, and the outer diameter portion of the sealing plate 57 and the outer ring fitting surface of the locking groove 61. Water or muddy water can be prevented from entering the bearing internal space 58, and leakage of grease, oil, etc. in the bearing internal space 58 can be prevented. Furthermore, it is possible to prevent a decrease in bearing life due to wear / cut of the seal lip 63. Further, in the case of outer ring rotation, as shown in the illustrated example, water and muddy water can be effectively prevented from entering the bearing inner space 58 and leakage of grease, oil, etc. in the bearing inner space 58 can be prevented. Can be prevented.

  Furthermore, as surface treatment with corrosion resistance and anticorrosion, zinc plating, unichrome plating, chromate plating, nickel plating, chrome plating, electroless nickel plating, Kanigen plating, iron trioxide coating (black dyeing), raydent, cationic electrodeposition Coating, anion electrodeposition coating, ceramic coating such as silicon nitride, etc. can be set.

It is also possible to use a coating such as TiN, TiC, TiCN, SiC, TiAlN, Al ₂ O ₃ , TiAl ₂ N, diamond, DLC, cBN, CrN, ZrN, and HfN by PVD or CVD. Yes, it can be set arbitrarily depending on the material of the target base material.

  In addition, this invention is not limited to embodiment mentioned above, A various deformation | transformation is possible.

  Next, an example of the second embodiment will be described. FIG. 11 is a schematic diagram of a submergence tester. FIG. 12 is a graph showing the test results of the examples.

  In the submerged testing machine shown in FIG. 11, reference numeral 71 is a drive motor, reference numeral 72 is a belt, reference numeral 73 is a driven pulley (evaluation bearing), and reference numeral 74 is a drive pulley. Yes, reference numeral 75 is a belt.

  That is, a belt 72 is stretched between the drive motor 71 and the drive pulley 74, and a belt 75 is stretched between the drive pulley 74 and the driven pulley 73 of the evaluation bearing. When 71 is driven, the driven pulley 73 of the evaluation bearing is rotated in water.

  In the examples, a trial production of a bearing in which the inner ring sliding surface on which the sealing plate slides and the outer ring fitting surface on which the sealing plate is fitted and locked was subjected to a phosphoric acid coating treatment was performed.

  In the evaluation test, 1) the bearing was rusted by a salt spray standing test, and then 2) a submergence test was performed to evaluate the sealability of the bearing. As a comparative example, an evaluation of a normal bearing (untreated phosphate coating on the inner and outer rings of the bearing) was also performed. The evaluation bearing and the contents of the evaluation test are as shown in Table 1.

  Examples and test results are shown in Table 2 and FIG. From FIG. 12, it was confirmed that the bearing in which the inner ring sliding surface and the outer ring fitting surface were subjected to the phosphoric acid film treatment had better water resistance than the normal bearing.

  Bearings with a phosphate coating on the inner ring sliding surface and outer ring mating surface fit and lock the inner ring sliding surface on which the tip of the seal lip slides and the outer diameter of the seal even in the salt spray test. This is because generation of rust on the outer ring fitting surface is prevented, and no gap is generated between the seal lip portion and the inner ring sliding surface and between the seal outer diameter portion and the outer ring fitting surface. From the above results, the present invention showed good results.

It is a longitudinal cross-sectional view of the rolling bearing unit with a sealing device which concerns on 1st Embodiment of this invention. It is the elements on larger scale of the sealing device assembled | attached to the A section of FIG. It is the elements on larger scale of the sealing device assembled | attached to the B section of FIG. It is sectional drawing of an example of the rolling bearing unit with a sealing device used as the application object of this invention. It is sectional drawing of the other example of the rolling bearing unit with a sealing device used as the application object of this invention. It is sectional drawing of the other example of the rolling bearing unit with a sealing device used as the application object of this invention. It is sectional drawing of the other example of the rolling bearing unit with a sealing device used as the application object of this invention. It is a longitudinal cross-sectional view of the rolling bearing unit with a sealing device which concerns on the past. It is a partial expanded sectional view of the sealing device assembled | attached to the A section of FIG. It is a partial expanded sectional view of the sealing device assembled | attached to the B section of FIG. It is a schematic diagram of a submerged testing machine. It is a graph which shows the test result of the Example of 2nd Embodiment. It is a longitudinal cross-sectional view of the rolling bearing with a sealing plate which concerns on the past.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Hub 3 Rolling element 4 Hub body 5 Inner ring element 6 Outer ring raceway 7 Inner ring raceway 8 Knuckle 9 Mounting flange 10 Spline hole 11 Constant velocity joint 12 Spline shaft 13 Internal space 14 a, 14b Seal ring 15 Core 16 16 Slinger 17 Seal material 18 Outer diameter side cylindrical portion 19 Outer ring portion 20 Inner diameter side cylindrical portion 21 Inner circular contour 22 Seal lip 23 Seal lip 24 Seal lip 27 Core metal 28 Seal material 29 Seal lip 30 Seal lip 31 Seal lip 51 Roll with seal plate Bearing 52 Outer ring raceway 53 Outer ring 54 Inner ring raceway 55 Inner ring 56 Rolling element 57 Sealing plate 58 Space 59 Core metal 60 Cage 61 Locking groove 62 Elastic material 63 Seal lip 71 Drive motor 72 Belt 73 Drive pulley (Evaluation bearing)
74 Drive pulley 75 Belt

Claims (2)

In a rolling bearing unit with a sealing device provided with a sealing device in which a seal lip provided on a seal member fixed to one of the outer ring or the inner ring is in sliding contact with the other opposing metal surface of the outer ring or the inner ring,
The metal surface with which the seal lip is slidably contacted is subjected to a surface treatment having corrosion resistance and corrosion resistance, and
A rolling bearing unit with a sealing device, wherein a surface treatment having corrosion resistance and anticorrosion is extended on a metal surface in the vicinity of the sealing device. With a sealing plate that has a contact-type sealing plate between the outer ring and inner ring on both sides, and either the inner or outer diameter side of the sealing plate is fixed and the other slides to maintain the sealing performance In rolling bearings,
Surface coating treatment with corrosion resistance and rust resistance is provided on both the sliding surface where the sealing plate contacts and slides on the bearing raceway and the mating surface where the sealing plate is fitted and locked to the bearing raceway. A rolling bearing with a sealing plate, characterized by being applied.

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