WO2014141859A1 - 密封装置付き軸受装置 - Google Patents
密封装置付き軸受装置 Download PDFInfo
- Publication number
- WO2014141859A1 WO2014141859A1 PCT/JP2014/054220 JP2014054220W WO2014141859A1 WO 2014141859 A1 WO2014141859 A1 WO 2014141859A1 JP 2014054220 W JP2014054220 W JP 2014054220W WO 2014141859 A1 WO2014141859 A1 WO 2014141859A1
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- WIPO (PCT)
- Prior art keywords
- inner ring
- side member
- sealing device
- peripheral surface
- cylindrical portion
- Prior art date
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7803—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings
- F16C33/7813—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings for tapered roller bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
- F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
- F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
- F16C19/383—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
- F16C19/385—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone with two rows, i.e. double-row tapered roller bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
- F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
- F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
- F16C19/383—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
- F16C19/385—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone with two rows, i.e. double-row tapered roller bearings
- F16C19/386—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone with two rows, i.e. double-row tapered roller bearings in O-arrangement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/583—Details of specific parts of races
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
- F16C33/782—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region
- F16C33/7823—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region of sealing lips
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
- F16C33/783—Details of the sealing or parts thereof, e.g. geometry, material of the mounting region
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
- F16C33/7879—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7896—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members with two or more discrete sealings arranged in series
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/80—Labyrinth sealings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2326/00—Articles relating to transporting
- F16C2326/10—Railway vehicles
Definitions
- This invention relates to a bearing device with a sealing device.
- FIG. 10 shows a railway vehicle axle bearing device using a double-row tapered roller bearing as an example of a bearing device with a sealing device.
- This device includes a double-row tapered roller bearing 110, an oil drain 104, and a rear lid 106.
- the double row tapered roller bearing 110 includes a pair of inner rings 112 adjacent to each other in the axial direction, a double row outer ring 114, a double row rolling element, that is, a tapered roller 116 in this case, and a cage 118, and a sealing device 120. It has.
- Each inner ring 112 has a conical track 112a on the outer periphery, and a large brim 112b and a small brim 112c are formed on both sides of the track 112a.
- the double-row outer ring 114 has a substantially cylindrical shape, has two rows of conical track-like tracks 114a on the inner periphery, and has annular recesses 114b on the inner periphery of both ends.
- a grease nipple 115 for replenishing grease inside the bearing is attached to the center of the double row outer ring 114.
- Tapered rollers 116 are interposed between the track 112a of the inner ring 112 and the track 114a of the outer ring 114, and the tapered rollers 116 in each row are held at predetermined intervals in the circumferential direction by a cage 118.
- the inner ring 112 is press-fitted into the shaft 102, and the outer ring 114 is attached to a bearing box (not shown).
- An oil drain 104 and a rear lid 106 are disposed on both axial sides of the pair of inner rings 112, and the oil drain 104 is adjacent to the inner ring 112 positioned on the shaft end side (left side in FIG. 10) of the shaft 102, and the rear lid 106. Is adjacent to the inner ring 112 on the opposite shaft end side (the right side in FIG. 10), and the pair of inner rings 112 are sandwiched in the axial direction by the oil drain 104 and the rear cover 106 to position the shaft 102 in the axial direction.
- Sealing devices 120 are provided between the outer ring 114 and the oil drainer 104 and between the outer ring 114 and the rear cover 106, respectively. Since the structure of the sealing device 120 is the same, only the sealing device on the rear lid 106 side will be described here, and the description on the oil drainer 104 side will be omitted. As shown in an enlarged view in FIG. 11, the sealing device 120 includes a sleeve 122, a seal case 124, a seal body 126, and a seal ring 128.
- the sleeve 122 is attached to the rear lid 106.
- a small-diameter cylindrical portion 106a having a slightly smaller diameter than the outer peripheral surface of the large collar 112b of the inner ring 112 is formed on the outer periphery of the end portion of the rear lid 106 on the inner ring 112 side.
- a step surface 106b rising in the radial direction from the small diameter cylindrical portion 106a is formed.
- a sleeve 122 whose outer peripheral surface is a contact surface of the seal lip is provided on the small diameter cylindrical portion 106a of the rear lid 106.
- the sleeve 122 includes an inner cylindrical portion 122a, a flat plate portion 122b, and an outer cylindrical portion 122c.
- the inner cylindrical portion 122a is fitted to the small diameter cylindrical portion 106a of the rear lid 106.
- the flat plate portion 122b of the sleeve 122 rises in the radial direction from the end on the far side as viewed from the bearing 110 of the inner cylinder portion 122a, and continues to the outer cylinder portion 122c on the outer diameter side.
- the flat plate portion 122b is brought into contact with the step surface 106b of the rear lid 106.
- the seal case 124 is attached to the outer ring 114 of the bearing 110, and extends coaxially around the outer periphery of the sleeve 122.
- the seal case 124 has a three-step cylindrical shape including a large-diameter cylindrical portion 124a, a medium-diameter cylindrical portion 124b, and a small-diameter cylindrical portion 124c, and the large-diameter cylindrical portion 124a is fitted in the annular recess 114b of the outer ring 114. .
- the small diameter cylindrical portion 124c is positioned on the outer periphery of the outer cylindrical portion 122c of the sleeve 122, and forms a labyrinth seal therebetween.
- the medium diameter cylindrical portion 124 b is a portion for holding the seal body 126.
- the seal body 126 includes a cored bar 126a and an elastic seal 126b.
- the metal core 126a is formed by pressing from a metal plate into an L-shaped cross section.
- the metal core 126a has a cylindrical portion and a flange portion, and the cylindrical portion is fitted to the medium diameter cylindrical portion 124b of the seal case 124.
- the base portion of the elastic seal 126b is integrally attached to the inner peripheral side edge of the flange portion of the core metal 126a.
- Three seal lips extend from the base of the elastic seal 126b. That is, two first lips extending obliquely toward the inner diameter side and a second lip extending in the axial direction. Among the first lips, the left lip in FIG. 11 faces the bearing 110 side, and the right lip in FIG.
- the second lip extends in a direction away from the bearing 110, has a tip that is enlarged in diameter, and is close to the inner peripheral surface of the outer cylindrical portion 122 c of the sleeve 122.
- the seal ring 128 is disposed closer to the bearing 110 than the seal body 126.
- the seal ring 128 includes a cylindrical portion and a flat plate portion, and the cylindrical portion is fitted to the inner periphery of the cylindrical portion of the core metal.
- the disc portion of the seal ring 128 has its tip (inner diameter end) close to the outer peripheral surface of the inner cylindrical portion 122 a of the sleeve 122 to form a labyrinth seal therebetween.
- the labyrinth seal formed between the seal ring 128 and the inner cylindrical portion 122a of the sleeve 122 and the two first lips that are in light contact with the outer peripheral surface of the inner cylindrical portion 122a of the sleeve 122 provide grease in the bearing 110, etc. Prevents the lubricant from leaking. Further, the labyrinth seal and the second lip formed between the small diameter cylindrical portion 124c of the seal case 124 and the outer cylindrical portion 122c of the sleeve 122 prevent water and foreign matter from entering the bearing.
- the sliding part of the seal lip is not the oil drainer or the rear cover.
- the sliding portion of the seal lip may be worn with time and the sealing performance may be lowered.
- the oil drain and rear cover can be replaced with a new one, but it is not economical to replace the inner ring. Therefore, it is conceivable to attach a separate sleeve to the outer peripheral surface of the large collar of the inner ring and replace the sleeve (Patent Document 1).
- the dimensional relationship between the inner ring and the shaft is usually designed to be an interference fit
- the sleeve is fitted to the outer peripheral surface of the large collar of the inner ring
- the dimensional change of the inner ring occurs due to the effect of the fit.
- press-fitting into the shaft may be difficult and galling of the shaft may occur.
- the fit between the inner ring and the shaft is tight only at the sleeve portion, the surface pressure is locally increased, and the shaft is worn.
- the object of the present invention is to eliminate such problems.
- the bearing device with a sealing device of the present invention includes an inner ring, an outer ring, a rolling element interposed between the race of the inner ring and the race of the outer ring, and holds the rolling element at a predetermined interval in the circumferential direction.
- the sealing device includes an inner ring side member attached to the inner ring, an outer ring side member attached to the outer ring, and a seal body interposed between the inner ring side member and the outer ring side member,
- An elastic layer for suppressing a change in the inner diameter of the inner ring is provided on a surface of the member that fits with the inner ring, and the base of the seal body is fixed to the inner ring side member or the outer ring side member. It is characterized by this.
- the elastic layer is for suppressing the dimensional change (reduction) of the inner diameter of the inner ring caused by fitting the inner ring side member to the inner ring as much as possible, preferably 10 ⁇ m or less.
- the diameter is preferably 0 mm to 2.0 mm, and the interference is preferably in the range of 100 ⁇ m to 500 ⁇ m in diameter.
- the thickness of the inner ring 12 at the portion where the inner ring side member 40 is fitted is 20 mm to 30 mm.
- the material constituting the elastic layer may be any material having a Young's modulus smaller than that of the metal material constituting the inner ring or the inner ring side member of the sealing device, and a typical example is rubber.
- Young's modulus is about 9.8 MPa and Poisson's ratio is about 0.3.
- the Young's modulus (longitudinal elastic modulus) is the ratio of the stress in the range below the proportional limit of the tensile test and the strain in that direction is called the longitudinal elastic modulus or Young's modulus.
- the ratio between shear stress and shear strain below the proportional limit is called the transverse elastic modulus.
- the ratio of lateral strain and longitudinal strain is constant within the elastic limit, and this is called Poisson's ratio.
- the seal body can be appropriately selected and employed from the types described above with reference to FIG. 11 and other existing types.
- Various oil seals are standardized (JIS B2042) and are also commercially available. Or it can also be set as the type which provided the seal lip integrally with the elastic-body layer in the inner ring
- the elastic material in this case should have characteristics (oil resistance, heat resistance, etc.) required for a bearing sealing device.
- the Young's modulus is higher than the metal material constituting the inner ring and the inner ring side member by interposing the elastic layer between the inner ring large collar and the inner ring side member of the sealing device fitted therein.
- the railway vehicle axle bearing shown in FIG. 1 is an example in which a double-row tapered roller bearing is used.
- the double row tapered roller bearing 10 includes a pair of inner rings 12, a double row outer ring 14, a tapered roller 16 as a rolling element, and a cage 18 as main components.
- the inner ring 12 is fitted to the shaft 2, and the axial direction is determined by the oil drain (see FIG. 10) fitted to the shaft 2 and the rear lid 6.
- Each inner ring 12 has a track 12a on the outer periphery, and a large collar 12b and a small collar 12c are formed on both sides of the track 12a.
- the outer ring 14 is a so-called double-row outer ring in which two rows of raceways 14a are formed on the inner periphery, and is fixed to a shaft box (not shown).
- a grease nipple 15 for replenishing grease as a lubricant is attached to the center of the outer ring 14.
- Two rows of tapered rollers 16 are interposed between the raceway 12 a of the inner ring 12 and the raceway 14 a of the outer ring 14, and the tapered rollers 16 in each row are held by the cage 18 at predetermined intervals in the circumferential direction.
- Sealing device S 1 can be employed by appropriately selecting an existing one. This means that the sealing device S 1 is simply shown in FIG. 1, and detailed description thereof is omitted here.
- the sealing device S 1 is composed of a seal body 20, a seal case 22, and a sleeve 24.
- the seal case 22 is fitted into an annular recess 14b formed at the end of the outer ring 14 and attached.
- the sleeve 24 is made of metal and has an L-shaped cross section, and the cylindrical portion on the inner diameter side is fitted to the outer peripheral surface of the large collar 12 b of the inner ring 12. Therefore, the seal case 22 that is the outer ring side member is the stationary side, and the sleeve 24 that is the inner ring side member is the rotation side.
- an elastic body layer 26 is interposed between the inner peripheral surface of the cylindrical portion of the sleeve 24 and the outer peripheral surface of the large collar 12b of the inner ring 12 as shown in FIG.
- the elastic layer 26 By interposing the elastic layer 26, the metal sleeve 24 can be directly fitted, while the change in inner diameter (reduced diameter) of the inner ring 12 can be suppressed.
- FIG. 12 shows the results of an experiment conducted to verify this.
- the vertical axis indicates the radial displacement (mm) of the inner diameter of the inner ring
- the horizontal axis indicates the axial distance (mm) from the small collar side
- the sleeve 24 and the outer peripheral surface of the large collar 12b of the inner ring 12 are shown.
- the inner diameter of the inner ring 12 is rapidly reduced when the axial distance from the small brim side exceeds about 40 mm.
- almost no change in the inner diameter of the inner ring is recognized.
- the thickness t is greater than 2.0 mm, the amount of deformation of the elastic body layer 26 increases, so that the position of the sleeve 24 integrated with the elastic body layer 26 deviates from or is inclined. Since an event occurs, there is an adverse effect on sealing performance, which is not preferable as a bearing sealing mechanism. Further, the tightening margin of the inner ring 12 with respect to the outer peripheral surface of the large collar 12b is set so as to give an appropriate crushing rate to the elastic body layer 26, and is set so as to have a fitting force of about 1 kN to 5 kN.
- the thickness of the portion to be fitted with the sleeve 24 is about 20 mm to 30 mm, and the material is Young's modulus E of 208 GPa and Poisson's ratio ⁇ of about 0.3. Assume metal.
- the dimensional change amount of the inner diameter of the inner ring 12 at the position where the sleeve 24 is fitted can be suppressed to 10 ⁇ m or less.
- the bearing in which the sleeve 24 is attached to the inner ring 12 can also be press-fitted into the shaft, and wear due to locally increased fitting surface pressure between the inner ring 12 and the shaft can be suppressed.
- rubber or elastomer can be employed as the material constituting the elastic layer 26. It is conceivable that the Young's modulus E is about 9.8 MPa and the Poisson's ratio ⁇ is about 0.3.
- nitrile rubber, hydrogenated nitrile rubber, acrylic rubber, fluorine rubber and the like can be mentioned.
- a groove 12d that runs in the circumferential direction is provided on the outer peripheral surface of the large collar 12b of the inner ring 12
- a circumferential protrusion 26a is provided on the inner peripheral surface of the elastic body layer 26, and the protrusion 26a is engaged with the groove 12d.
- the protrusions 26a may extend over the entire circumference or may be intermittently arranged in the circumferential direction.
- FIG. 4 shows the longitudinal section of the elastic body layer 26 with a convex arc shape, and the outer surface of the large collar 12b of the inner ring 12 has a concave arc shape.
- This is an example of restraining.
- the radius of curvature of the arc is arbitrary as long as the object of increasing the axial restraint force on the elastic layer 26 can be achieved.
- the step 12 e is provided on the outer peripheral surface of the large collar 12 b of the inner ring 12 and the end surface of the cylindrical portion of the sleeve 24 is abutted, the movement of the sleeve 24 toward the bearing inner side of the elastic layer 26 is not performed. Alternatively blocked.
- FIG. 5 shows an example in which a reduced diameter portion 24a is provided on the inner periphery of the tip of the cylindrical portion of the sleeve 24, and is hooked in a circumferential groove 12f provided on the outer peripheral surface of the large collar 12b of the inner ring 12.
- the reduced diameter portion 24a may be in the form of an inward flange in which the tip of the cylindrical portion of the sleeve 24 is bent toward the inner diameter side, or may have a shape as shown in FIG. 5 by plastic working such as caulking. Further, the reduced diameter portion 24a may be continuous in the circumferential direction, or may have a form in which claws are disposed at one place or intermittently in the circumferential direction.
- FIG. 6 shows an example in which the rear lid 6 is applied to the cylindrical portion of the sleeve 24 to restrain the axial direction, that is, to suppress the width.
- the axial restraint on the sleeve 24 is further ensured by carrying out this in combination with the structure in which the step 12 e is provided on the large collar 12 b of the inner ring 12.
- the inner ring 112 on the shaft end side of the shaft 102 and the adjacent oil drain 104 are brought into contact with each other, and the inner ring 112 on the opposite shaft end side and the adjacent rear lid 106 are brought into contact with each other.
- an axial groove running in the axial direction is provided on the outer circumferential surface of the large collar 12b of the inner ring 12, while running on the inner circumferential surface of the elastic layer 26 in the axial direction.
- An axial projection may be provided, and these axial grooves and the axial projection may be engaged. It is sufficient if the axial groove is provided in at least one place in the circumferential direction, but it is preferable in view of rotational balance that two or more axial grooves are equally arranged in the circumferential direction.
- the outer peripheral surface of the large collar 12b of the inner ring 12 may be knurled, or the inner ring 12 and the metal portion of the sleeve 24 may be welded. In these cases, axial and circumferential constraints on the sleeve 24 are achieved. For example, by adopting spot welding, the cylindrical portion of the sleeve 24 and the inner ring 12 can be welded even if the elastic layer 26 is interposed.
- the sealing device S 2 includes an outer ring side member 30 and an inner ring side member 40.
- the outer ring side member 30 is attached to the outer ring 14, and the inner ring side member 40 is attached to the inner ring 12. Therefore, the outer ring side member 30 is a stationary side member, and the inner ring side member 40 is a rotation side member.
- the outer ring side member 30 is an annular body formed by pressing from a metal plate, and includes a large diameter cylindrical portion 32, a small diameter cylindrical portion 34, and a connection portion 36.
- the large-diameter cylindrical portion 32 is a portion that is press-fitted into an annular recess 14 b formed at the end of the outer ring 14.
- the small diameter cylindrical portion 34 forms a small gap with the sleeve 42 of the inner ring side member 40 to constitute a labyrinth seal.
- the connecting portion 36 includes a radial portion 36a near the large-diameter cylindrical portion 32 that is continuous with the end portion on the bearing outer side of the large-diameter cylindrical portion 32, and a small-diameter cylindrical portion that is continuous with the end portion on the bearing external side of the small-diameter cylindrical portion 34. It consists of a radial portion 36b near 34 and a conical portion 36c that connects these radial portions 36a, 36b.
- the radial portion 36a near the large-diameter cylindrical portion 32 is flush with the ends of the inner ring 12 and the outer ring 14, and the conical portion 36c increases from the outer diameter side to the inner diameter side. It has shifted to the inside of the bearing.
- the end of the cage 18 enters the annular space of the outer ring side member 30 indicated by reference numeral 38.
- the inner ring side member 40 includes a metal sleeve 42 and an elastic body 44.
- the sleeve 42 has a cylindrical portion 42a, an outward flange 42b bent radially outward from one end of the cylindrical portion 42a, and an inward flange 42c bent radially inward from the other end of the cylindrical portion 42a. It consists of.
- the inner diameter of the inward flange 42 c is larger than the outer peripheral surface of the large collar 12 b of the inner ring 12. Therefore, naturally, the inner diameter of the cylindrical portion 42a is larger than the outer peripheral surface of the large collar 12b of the inner ring 12.
- the elastic body 44 includes a cylindrical portion 44a positioned on the inner diameter side of the cylindrical portion 42a of the sleeve 42, a base portion 44b positioned on the outer periphery of the outward flange 42b, and an outward flange 42b.
- the seal lips 44c and 44d are further extended to the outer diameter side.
- the cylindrical portion 44a, the base portion 44b, and the seal lips 44c and 44d are all made of the same elastic material.
- the cylindrical portion 44a corresponds to the elastic body layer 26 in the embodiment shown in FIGS.
- the seal lips 44 c and 44 d constitute a seal body that is interposed between the outer ring side member 30 and the inner ring side member 40. In consideration of workability when the inner ring side member 40 is fitted into the outer peripheral surface of the large brim 12b of the inner ring 12 by press fitting, the inner diameter of the cylindrical portion 44a is increased toward both ends as shown in FIG. It is.
- the cylindrical portion 44a corresponding to the elastic body layer 26 suppresses the dimensional change (reduction) of the inner diameter of the inner ring 12 caused by fitting the inner ring side member 40 to the inner ring 12 as much as possible, preferably 10 ⁇ m or less. Therefore, it is preferable that the thickness is 1.0 mm to 2.0 mm and the fastening margin is 100 ⁇ m to 500 ⁇ m in diameter. In this case, the thickness of the inner ring 12 where the inner ring side member 40 is fitted is 20 mm to 30 mm.
- the elastic material is a material having a Young's modulus smaller than that of steel.
- rubber may be mentioned as a representative example. it can.
- the inner ring 12 and the sleeve 42 are made of a steel material, the inner ring 12 and the sleeve 42 are formed by interposing an elastic body 44 (particularly, the cylindrical portion 44a) made of a material having a smaller Young's modulus between them. The influence of the fit is absorbed by the deformation of the elastic body 44, and the inner diameter of the inner ring 12 is suppressed from being reduced or deformed.
- the material constituting the elastic body 44 is also the material constituting the seal lips 44c and 44d, it is desirable to have a characteristic as a seal material.
- synthetic rubbers such as nitrile rubber, hydrogenated nitrile rubber, acrylic rubber, and fluorine rubber are known as oil seal materials, but silicone rubber and other elastomers are also used as long as they have properties as seal materials. can do.
- the cylindrical portion 44 a and the base portion 44 b of the elastic body 44 are fixed to the sleeve 42.
- the two can be integrated using vulcanization adhesion.
- the thermoplastic elastomer which can be injection-molded is employ
- both can be aimed at using insert molding.
- the seal lip of the elastic body 44 is constituted by a double lip of an inner lip 44c and an outer lip 44d that are spaced apart from each other in the axial direction, and an annular groove having an open outer diameter side is formed therebetween.
- both the inner lip 44c and the outer lip 44d are inclined toward the bearing inner side in the natural state.
- the tips of these lips 44c and 44d are both located on the bearing inner side of the radial portion 36a near the large-diameter cylindrical portion 32 of the outer ring side member 30.
- the inner lip 44 c and the outer lip 44 d elastically contact the outer surface of the connection portion 36 of the outer ring side member 30.
- the inner lip 44c is in contact with the radial portion 36a of the connecting portion 36 near the small diameter cylindrical portion 32
- the outer lip 44d is in contact with the conical portion 36c of the connecting portion 36.
- the labyrinth seal formed by the small diameter cylindrical portion 34 of the outer ring side member 30 and the sleeve 42 of the inner ring side member 40 prevents the grease filled in the bearing from flowing out.
- the inner lip 44c mainly prevents the grease filled in the bearing from leaking out. It also plays the role of blocking water that has entered through the outer lip 44d.
- the outer side 44d mainly serves to prevent water and other foreign substances from entering from the outside.
- the inner lip 44c and the outer lip 44d belong to the rotation side member, they also function to shake off water or the like by the action of centrifugal force while the bearing is rotating. Since the annular space formed between the inner lip 44c and the outer lip 44d is open to the outer diameter side, even if water or foreign matter enters the outer space, it will move to the outer diameter side due to centrifugal force during rotation of the bearing. It is discharged to the outside of the bearing, and when stationary, it is discharged by natural fall from the bottom, that is, from 6 o'clock on the clock display.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
- Sealing Of Bearings (AREA)
Abstract
Description
複列円すいころ軸受110は、軸方向に隣接した一対の内輪112と、複列外輪114と、複列の転動体すなわちここでは円すいころ116と、保持器118とを有し、さらに密封装置120を備えている。
この発明の目的はこのような問題点を除去することにある。
前記密封装置は、前記内輪に取り付けた内輪側部材と、前記外輪に取り付けた外輪側部材と、前記内輪側部材と前記外輪側部材との間に介在させたシール本体とからなり、前記内輪側部材の、前記内輪と嵌合する表面に、前記内輪の内径の寸法変化を抑制するための弾性体層が設けてあり、前記シール本体の基部を前記内輪側部材又は前記外輪側部材に固定したことを特徴とするものである。
外輪側部材30の小径筒部34と内輪側部材40のスリーブ42とで形成されるラビリンスシールによって、軸受内部に充填したグリースの流出を防止する。内側リップ44cは主として軸受内部に充填したグリースが外部にもれ出るのを防止する。外側リップ44dを通過して進入した水などを堰き止める役割も果たす。外側44dは主として外部から水その他の異物が侵入するのを防止する役割を果たす。
4 油切り
6 後蓋
10 複列円すいころ軸受
12 内輪
12a 軌道
12b 大つば
12c 小つば
12d 円周方向溝
12e 段差
12f 円周方向溝
14 外輪
14a 軌道
14b 環状凹部
15 グリースニップル
16 円すいころ
18 保持器
S1 密封装置
20 シール本体
22 ケース(外輪側部材)
24 スリーブ(内輪側部材)
24a 縮径部
26 弾性体層
26a 円周方向突起
S2 密封装置
30 外輪側部材
32 大径円筒部
34 小径円筒部
36 接続部
38 空間
40 内輪側部材
42 スリーブ
42a 円筒部
42b 外向きフランジ
42c 内向きフランジ
44 弾性体
44a 円筒部(弾性体層)
44b 基部
44c 内側リップ(シール本体)
46d 外側リップ(シール本体)
Claims (10)
- 内輪と、外輪と、前記内輪の軌道と前記外輪の軌道との間に介在させた転動体と、前記転動体を円周方向で所定間隔に保持する保持器とを具備し、前記内輪と前記外輪との間に密封装置を取り付けたものにおいて、
前記密封装置は、前記内輪に取り付けた内輪側部材と、前記外輪に取り付けた外輪側部材と、前記内輪側部材と前記外輪側部材との間に介在させたシール本体とからなり、前記内輪側部材の、前記内輪と嵌合する表面に、前記内輪の内径の寸法変化を抑制するための弾性体層が設けてあり、前記シール本体の基部を前記内輪側部材又は前記外輪側部材に固定した、密封装置付き軸受装置。 - 前記シール本体の基部を前記外輪側部材に固定し、前記シール本体の先端を前記内輪側部材の表面に弾性的に接触させた請求項1の密封装置付き軸受装置。
- 前記シール本体の基部を前記内輪側部材に固定し、前記シール本体の先端を前記外輪側部材の表面に弾性的に接触させた請求項1の密封装置付き軸受装置。
- 前記外輪側部材は、前記外輪の端部内周面と嵌合する大径円筒部と、前記大径円筒部と平行な小径円筒部と、前記大径円筒部の外端部と前記小径円筒部の外端部を接続する接続部とからなり、
前記内輪側部材は、前記内輪のつばの外周面よりも大きな内径を有する円筒形のスリーブと、前記スリーブの外端部から半径方向外方に立ち上がったフランジとからなり、前記スリーブの内周面から前記フランジの表面を経てさらに前記フランジから半径方向に突出して前記シールリップを形成した弾性体層を有する請求項3の密封装置付き軸受装置。 - 前記シールリップは軸方向で互いに離間した内側リップと外側リップとからなり、前記両リップ間に外径側に開放した環状溝を形成した、請求項4の密封装置付き軸受装置。
- 前記内輪のつばの外周面に円周方向溝を形成し、前記内輪側部材の内径側に位置する弾性体層の内周面に円周方向突起を形成し、前記円周方向溝に前記円周方向突起を係合させた請求項1ないし5のいずれか1項の密封装置付き軸受装置。
- 縦断面において、前記内輪側部材の内周面を凸円弧状とし、前記内輪のつばの外周面を凹円弧状とした請求項1ないし5のいずれか1項の密封装置付き軸受装置。
- 前記内輪のつばの外周面に円周方向溝を形成し、前記内輪側部材の内端部に内径側を向いた爪を形成し、前記円周方向溝に前記爪を係合させた請求項1ないし5のいずれか1項の密封装置付き軸受装置。
- 前記内輪のつばの外周面にローレット加工を施した請求項1ないし5のいずれか1項の密封装置付き軸受装置。
- 前記内輪のつばの外周面に軸方向溝を形成し、前記内輪側部材の内周面に軸方向突起を形成し、前記軸方向溝に前記軸方向突起を係合させた請求項1ないし5のいずれか1項の密封装置付き軸受装置。
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CN201480014170.3A CN105229323A (zh) | 2013-03-15 | 2014-02-21 | 带密封装置的轴承装置 |
EP14765599.7A EP2975279A4 (en) | 2013-03-15 | 2014-02-21 | BEARING DEVICE WITH SEALING DEVICE |
US14/775,130 US20160017926A1 (en) | 2013-03-15 | 2014-02-21 | Bearing device with sealing device |
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JP2013053156A JP6214891B2 (ja) | 2013-03-15 | 2013-03-15 | 密封装置付き軸受装置 |
JP2013-053156 | 2013-03-15 |
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US (1) | US20160017926A1 (ja) |
EP (1) | EP2975279A4 (ja) |
JP (1) | JP6214891B2 (ja) |
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JP6615537B2 (ja) * | 2015-08-28 | 2019-12-04 | Nok株式会社 | 密封装置 |
JP6786323B2 (ja) * | 2016-09-20 | 2020-11-18 | Ntn株式会社 | 車軸用軸受装置 |
JP6895283B2 (ja) * | 2017-03-16 | 2021-06-30 | Ntn株式会社 | 車輪用軸受装置 |
JP7114239B2 (ja) * | 2017-10-30 | 2022-08-08 | ナブテスコ株式会社 | シール機構を備える装置 |
CN111122078A (zh) * | 2019-11-22 | 2020-05-08 | 河南航天精工制造有限公司 | 一种孔用钢丝挡圈的弹性试验工装及其芯轴组件 |
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US20160017926A1 (en) | 2016-01-21 |
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EP2975279A4 (en) | 2016-10-12 |
JP6214891B2 (ja) | 2017-10-18 |
EP2975279A1 (en) | 2016-01-20 |
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