WO2018001026A1 - 盒式密封结构及圆锥滚子轴承 - Google Patents

盒式密封结构及圆锥滚子轴承 Download PDF

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Publication number
WO2018001026A1
WO2018001026A1 PCT/CN2017/086400 CN2017086400W WO2018001026A1 WO 2018001026 A1 WO2018001026 A1 WO 2018001026A1 CN 2017086400 W CN2017086400 W CN 2017086400W WO 2018001026 A1 WO2018001026 A1 WO 2018001026A1
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WO
WIPO (PCT)
Prior art keywords
sealing
slinger
outer side
cartridge
radially
Prior art date
Application number
PCT/CN2017/086400
Other languages
English (en)
French (fr)
Inventor
刘鑫
尼伯林乌维
吴丽娟
阿瑞玛·吉尔森
蔡福强
石晓义
宋宏伟
刘志恒
Original Assignee
舍弗勒技术股份两合公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 舍弗勒技术股份两合公司 filed Critical 舍弗勒技术股份两合公司
Priority to AU2017287189A priority Critical patent/AU2017287189B2/en
Priority to RU2019102072A priority patent/RU2737819C2/ru
Priority to EP17819023.7A priority patent/EP3477137B1/en
Priority to US16/312,031 priority patent/US10731706B2/en
Priority to BR112018076975-4A priority patent/BR112018076975B1/pt
Publication of WO2018001026A1 publication Critical patent/WO2018001026A1/zh
Priority to ZA2018/06607A priority patent/ZA201806607B/en

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Classifications

    • 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
    • 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
    • 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
    • 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
    • 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
    • F16C33/34—Rollers; Needles
    • F16C33/36—Rollers; Needles with bearing-surfaces other than cylindrical, e.g. tapered; with grooves in the bearing surfaces
    • 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
    • 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
    • F16C33/784—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race
    • F16C33/7859—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a further sealing element
    • F16C33/7863—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a further sealing element mounted to the inner race, e.g. a flinger to use centrifugal effect
    • 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
    • F16C33/784—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race
    • F16C33/7859—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a further sealing element
    • F16C33/7866—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a further sealing element with sealing lips
    • 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
    • F16C33/7883—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 mounted to the inner race and of generally L-shape, the two sealing rings defining a sealing with box-shaped cross-section
    • 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
    • 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
    • F16C33/805—Labyrinth sealings in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
    • B61F15/00—Axle-boxes
    • B61F15/20—Details
    • B61F15/22—Sealing means preventing entrance of dust or leakage of oil
    • 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
    • F16C19/36—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 a single row of rollers
    • F16C19/364—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 a single row of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
    • 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

Definitions

  • the present invention relates to the field of sealing, and more particularly to a box-type sealing structure mainly used for bearing seals in the railway field and a tapered roller bearing using the box-type sealing structure.
  • a tapered roller bearing includes two cartridge sealing structures disposed on both axial sides.
  • Each of the cartridge sealing structures is annular in shape and is used to seal the oil medium (usually referred to as lubricating oil) in the bearing and prevent foreign matter from entering the bearing.
  • the prior art cartridge sealing structure 10 includes a slinger 101 for fixing to an inner ring of a bearing and a sealing ring for fixing to an outer ring of the bearing, the sealing ring including a skeleton 102 fixed to the outer ring and attached to The sealing portion 103 of the skeleton 102 has a plurality of sealing lips (including a main sealing lip 105 and a plurality of secondary sealing lips 106) extending toward the slinger 101.
  • a bent portion 104 is provided on the axial inner side of the oil slinger axial portion 101a extending in the axial direction A of the slinger 101, and the bent portion 104 extends radially outward along the radial direction R.
  • the inventors have found that in practical applications, the oil medium inevitably enters the cartridge sealing structure 10 from the gap described above. Once the oil medium enters the cassette sealing structure 10, the oil medium can only flow toward the axially outer side in the cassette sealing structure 10 without returning to the inside of the bearing. Thus, the oil medium is inevitably leaked from the cartridge sealing structure 10. Therefore, the sealing effect of the prior art cartridge sealing structure 10 on the oil medium is unsatisfactory.
  • the present invention has been made based on the above-described drawbacks of the prior art, and an object of the present invention is to provide a cartridge type sealing structure capable of improving the sealing effect of an oil medium and a tapered roller bearing having the same.
  • the present invention adopts the following technical solutions.
  • the present invention provides a cartridge sealing structure in which the cartridge sealing structure is entirely annular, the cartridge sealing structure includes a slinger and a sealing ring, the sealing ring including a skeleton and attached to the skeleton a sealing portion, the slinger having an axial portion of the slinger extending in the axial direction, the slinger further having a first centrifugal structure axially inward of the axial portion of the slinger, the first a centrifugal structure having a first bent portion that extends toward the radially outer side while extending toward the radially inner side, and the sealing portion includes a first bent portion that is disposed apart from the first bent portion a first sealing cover portion on the radially outer side, the first sealing cover portion extending at least axially inward in the axial direction to a position flush with the first bent portion.
  • the radially inner side surface of the first sealing cover portion extends in the axial direction.
  • the sealing portion is provided with a plurality of pump oil grooves opposite to the axial portion of the slinger, the plurality of pump oil grooves Arranging circumferentially spaced apart, and a radially outer side of the pump oil groove is connected to a radially inner side of the first seal cover portion, a radially outer side of the pump oil groove from the first seal cover portion Radial inner side facing The axially outer side extends while extending toward the radially inner side.
  • the sealing portion further includes a main sealing lip and a plurality of secondary sealing lips located axially outward of the pump oil groove, the main sealing lip and the plurality of secondary sealing lips facing the slinger extend.
  • the main sealing lip is a contact sealing lip that is in contact with the slinger, the main sealing lip extends toward the radially outer side while extending toward the radially outer side, and the plurality of secondary sealing lips All of the non-contact sealing lips, the plurality of secondary sealing lips comprising: at least two labyrinth lips extending radially toward the axial portion of the slinger and located in the main seal An axially inner side of the lip, a labyrinth groove recessed toward the radially outer side is formed between two adjacent labyrinth lips of the at least two labyrinth lips; and a dust lip extending toward the axially outer side At the same time, it extends toward the radially outer side, and the dust lip is located radially outward of the main seal lip.
  • the slinger further has a radially extending slinger radial portion and a second centrifugal structure radially outward of the slinger radial portion, the second centrifugal structure having an orientation axis a second bent portion extending toward the outside while extending toward the outside, the seal ring including a second seal disposed radially outward of the second bent portion from the second bent portion In the cover portion, the second seal cover portion extends at least toward the axially outer side in the axial direction to a position flush with the second bent portion.
  • the gap there is a gap between the second bent portion and the second sealing cover portion, and the gap gradually decreases from the axially inner side toward the axially outer side.
  • the second centrifugal structure further has a third bent portion extending toward the radially inner side while extending toward the axially outer side, the third bent portion being located at the second bent portion and the throwing A radial portion of the oil ring is coupled between the second bent portion and the slinger radial portion.
  • the skeleton has a skeleton radial portion, the skeleton radial portion including an axial portion and a bent portion, the axial portion extending axially outward toward the axial direction, the bent portion being from the The radially outer end of the axial portion extends toward the inner side in the axial direction while extending toward the radially inner side, so that The second sealing cover portion is formed by the axial portion and the bent portion, or the sealing portion includes the second sealing cover portion.
  • the present invention also provides a tapered roller bearing including an inner ring and an outer ring that are rotatable relative to each other, and a cartridge sealing structure according to any one of the above aspects.
  • the skeleton of the sealing ring of the cartridge sealing structure is fixed to the outer ring, and the oil slinger of the cartridge sealing structure is fixed to the inner ring.
  • the cartridge sealing structure of the present invention can improve the sealing effect of the cartridge sealing structure on the oil medium by increasing the pumping effect of the oil medium and preventing the oil medium from flowing into the cartridge sealing structure, and adopting the cartridge seal of the present invention.
  • the tapered roller bearing of the structure can achieve the same effect.
  • FIG. 1 shows a partial cross-sectional view of a prior art cartridge seal structure showing half of the axial cross-sectional configuration of the cartridge seal structure.
  • FIG. 2 is a partial cross-sectional view showing a cartridge seal structure according to a first embodiment of the present invention, showing half of the axial cross-sectional configuration of the cartridge seal structure.
  • FIG 3 is a partial cross-sectional view showing a cartridge seal structure according to a second embodiment of the present invention, showing half of the axial cross-sectional configuration of the cartridge seal structure.
  • FIG. 4 is a partial cross-sectional view showing a cartridge seal structure according to a third embodiment of the present invention, showing half of the axial cross-sectional configuration of the cartridge seal structure.
  • the "axial direction” indicated by the mark A is the direction of the central axis of the cartridge sealing structure;
  • the "radial direction” indicated by the mark R is the radial direction of the cartridge sealing structure.
  • the right side in the drawing is an axial outer side, and the left side in the drawing is an axial inner side;
  • the upper side in the drawing is a radially outer side, and the lower side in the drawing is a radially inner side.
  • the oil medium such as lubricating oil is located on the inner side in the axial direction, and foreign matter such as dust is located on the outer side in the axial direction.
  • the cartridge sealing structure 1 has an annular shape as a whole.
  • the cassette seal structure 1 includes a slinger 11 for fixing to an inner ring of a bearing and a seal ring for fixing to an outer ring of the bearing.
  • the seal ring includes a skeleton 12 for fixing to an outer ring of the bearing and a seal portion 13 attached to the frame 12.
  • the slinger 11 and the bobbin 12 are made of a hard material such as metal, and the sealing portion 13 is made of an elastic material such as rubber.
  • the slinger 11 has a slinger axial portion 11a0 extending in the axial direction A and a slinger radial portion 11b0 extending in the radial direction R.
  • the slinger axial portion 11a0 is for fixing to the inner ring of the bearing.
  • the bobbin 12 has a skeleton axial portion 12a and a skeleton radial portion 12b extending in the axial direction A.
  • the skeleton axial portion 12a is for fixing to the outer ring of the bearing, and the sealing portion 13 is attached to the skeleton radial portion 12b.
  • the skeleton radial portion 12b includes a first radial portion 12b0 and a second radial portion 12b2 and a connecting portion 12b1 between the first radial portion 12b0 and the second radial portion 12b2.
  • the first radial portion 12b0 and the second radial portion 12b2 both extend in the radial direction R and the second radial portion 12b2 is located radially inward of the first radial portion 12b0, the connecting portion 12b1 and the first radial portion 12b0 and the The two radial portions 12b2 are each connected and the connecting portion 12b1 extends toward the radially outer side while extending toward the radially inner side.
  • the slinger 11 has a first centrifugal structure extending from the axially innermost end of the slinger axial portion 11a0 and extending from the radially outermost end of the slinger radial portion 11b0.
  • the second centrifugal structure is for pumping the oil medium entering the cartridge sealing structure 1 back into the bearing (ie, pumping the oil medium to the axial inner side), and the second centrifugal structure is for pumping the foreign matter entering the cartridge sealing structure 1. To the outside (ie pumping foreign objects to the outside of the axial direction).
  • the first centrifugal structure has a first bent portion 11a1 extending from the axially innermost end of the oil slinger axial portion 11a0.
  • the extending direction of the first bent portion 11a1 is inclined with respect to both the axial direction A and the radial direction R, that is, the first bent portion 11a1 extends toward the axially inner side while extending toward the radially outer side.
  • the first bending portion 11a1 (the axially outer side surface thereof), the oil medium flowing into the cartridge sealing structure 1 is easily made by centrifugal force during the rotation of the slinger 11 of the cartridge sealing structure 1 with respect to the sealing ring.
  • the first bent portion 11a1 is pumped to the axially inner side. In this way, the sealing effect of the cartridge sealing structure 1 on the oil medium is improved.
  • the second centrifugal structure has a third bent portion 11b2 and a second bent portion 11b1 which are sequentially connected from the radially outermost end of the slinger radial portion 11b0.
  • the extending directions of the third bent portion 11b2 and the second bent portion 11b1 are both inclined with respect to both the axial direction A and the radial direction R. That is, the third bent portion 11b2 extends outward in the radial direction while extending inward in the axial direction, and the second bent portion 11b1 extends outward in the radial direction while extending outward in the radial direction.
  • the foreign matter can be pumped to the axially outer side by the second bent portion 11b1 (the radially outer side surface thereof), and the sealing effect of the cartridge sealing structure 1 on the foreign matter is improved.
  • the second centrifugal structure can be prevented from extending to the axially outer side of the slinger radial portion 11b0, thereby ensuring a compact structure of the entire cartridge sealing structure 1.
  • the sealing portion 13 includes a first sealing cover portion 131 and a second sealing cover portion 132.
  • the first sealing cover portion 131 is for covering the first centrifugal structure (the first bending portion 11a1) from the radially outer side, thereby ensuring that the oil medium inside the bearing is difficult to pass between the first sealing cover portion 131 and the first centrifugal structure
  • the gap enters the cartridge sealing structure 1.
  • the second seal cover portion 132 is for covering the second centrifugal structure (the second bent portion 11b1 and the third bent portion 11b2) from the radially outer side, thereby ensuring that the foreign matter on the axially outer side is difficult to pass through the second seal cover portion 132.
  • the gap with the second centrifugal structure enters the cartridge sealing structure 1.
  • the sealing effect of the cartridge sealing structure 1 on foreign matter is further improved.
  • the first sealing cover portion 131 is positioned radially outward of the first centrifugal structure and extends at least axially inward in the axial direction A to a position flush with the first centrifugal structure such that the second sealing cover portion 132 Located radially outward of the second centrifugal structure and extending at least axially outward in the axial direction A to a position flush with the second centrifugal structure.
  • the gap between the first sealing cover portion 131 and the first centrifugal structure and the gap between the second sealing cover portion 132 and the second centrifugal structure are made as small as possible, so that the prevention of foreign matter and oil can be better achieved.
  • the medium enters the purpose of the cartridge sealing structure 1.
  • the structure may be such that the radially inner side surface 131a of the first seal cover portion 131 extends along the axial direction A (substantially parallel to the axial direction A), ensuring the first seal cover portion 131 (radial inner side surface 131a) and the first
  • the gap between the centrifugal structures is sufficiently small; the gap between the second seal cover portion 132 (the radially inner side surface 132a) and the second bent portion 11b1 (the radially outer side surface thereof) is gradually increased from the axially inner side toward the axially outer side.
  • the reduced shape that is, the gap is getting smaller from the axially inner side toward the axially outer side.
  • the seal portion 13 is provided with the slinger shaft
  • the plurality of pump oil grooves 137 are circumferentially spaced apart, and the radially outer side surface 137a of the oil pumping groove 137 is connected to the radially inner side surface 131a of the first seal cover portion 131, and The radially inner side surface 131a of the first seal cover portion 131 extends toward the radially outer side while extending toward the radially outer side.
  • the pump oil groove 137 is located axially inward of the second radial portion 12b2 of the bobbin radial portion 12b.
  • the sealing portion 13 further includes a main sealing lip 133 extending toward the slinger axial portion 11a0 and a plurality of secondary sealing lips.
  • the plurality of secondary seal lips include a dust lip 134 extending toward the third bent portion 11b2 and two labyrinth lips 135 extending toward the oil slinger axial portion 11a0.
  • the main seal lip 133 is located radially inward of the second seal cover portion 132, and the main seal lip 133 extends toward the radially outer side while extending toward the radially inner side, and the main seal lip 133 is preferably with the slinger shaft A contact seal lip that contacts the portion 11a0.
  • the main sealing lip 133 serves to separate the oil medium and the foreign matter entering the cartridge sealing structure 1.
  • the dust lip 134 in the radial direction R, is located between the second sealing cover portion 132 and the main sealing lip 133, that is, the dust lip 134 is located radially inward of the second sealing cover portion 132 and is located at the main The radially outer side of the sealing lip 133.
  • the dust lip 134 extends toward the outer side in the axial direction while extending outward in the radial direction, and the dust lip 134 is preferably a non-contact sealing lip.
  • the dust lip 134 can hold the foreign matter entering the cartridge sealing structure 1 for a certain period of time, and then discharge the foreign matter through the gap between the second centrifugal structure and the radially inner side surface 132a of the second sealing cover portion 132.
  • the space surrounded by the second seal cover portion 132, the second bent portion 11b1, the third bent portion 11b2, and the dust lip 134 forms a bent passage, and the total length of the passage is long, further preventing foreign matter Entry.
  • two labyrinth lips 135 are located between the main sealing lip 133 and the pump oil groove 137, that is, the two labyrinth lips 135 are located axially inside the main sealing lip 133 and are located in the pump oil groove 137.
  • the two labyrinth lips 135 extend radially toward the slinger axial portion 11a0.
  • a labyrinth groove 136 that is recessed toward the radially outer side is formed between the two labyrinth lips 135, passing through the two labyrinth lips 135
  • the space between the axial portion 11a0 of the slinger and the space between the labyrinth 136 and the axial portion 11a0 of the slinger form a labyrinth structure (the space through which the oil medium flows to the outside in the axial direction becomes smaller and larger)
  • the structure is reduced in order to block the oil medium from flowing axially outward in the cartridge sealing structure 1.
  • the skeleton radial portion 12b is provided with a plurality of detaching holes 138 (e.g., elliptical detaching holes) which are circumferentially spaced apart, by which the cartridge sealing structure 1 is easily detached.
  • detaching holes 138 e.g., elliptical detaching holes
  • the cartridge seal structure 1 ensures good sealing performance to the oil medium by using a centrifugal seal, a pump seal, a labyrinth seal, a gap seal, and a seal lip seal.
  • the structure of the second embodiment of the present invention is similar to the structure of the first embodiment of the present invention, and is different in that, in the second embodiment, the pump oil tank 137 is not provided, and three are provided.
  • the labyrinth lip 135 and the two labyrinth slots 136 (forming a reinforced labyrinth seal); and the radially inner side of the second seal cap portion 132 extends in the axial direction.
  • the space between the three labyrinth lips 135 and the oil slinger axial portion 11a0 and the two labyrinth grooves 136 and the slinger shaft can be made.
  • a reinforced labyrinth structure is formed in the space between the portions 11a0, and the effect of the reinforced labyrinth structure blocking the flow of the oil medium to the outside in the axial direction is more remarkable, so that the pump oil groove 137 may not be provided as in the first embodiment.
  • the second sealing cover portion 132, the second bending portion 11b1, the third bending portion 11b2, and the dust lip 134 form a long bending passage, the foreign matter does not enter the inside of the cartridge sealing structure 1 Since it can be discharged to the outside, the radial inner side surface of the second seal cover portion 132 can be formed unlike the first embodiment.
  • the cartridge sealing structure 1 employs a centrifugal seal, a reinforced labyrinth seal, a gap seal, and a seal lip seal to ensure good sealing performance to the oil medium.
  • the structure of the third embodiment of the present invention is similar to the structure of the first embodiment of the present invention, and is different in that, in the third embodiment, the skeleton radial portion 12b is formed with the orientation
  • the curved structure in which the centrifugal structure is curved is formed into the same structure as the second seal cover portion 132 of the first embodiment by the curved structure.
  • the service life of the second sealing cover portion 132 made of rubber may be short, and thus the radial portion of the skeleton made of metal is used.
  • a portion of 12b forms a curved structure as shown in Fig. 4 to form a second sealing cover portion, thereby greatly extending the service life of the second sealing cover portion.
  • the skeleton radial portion 12b includes a first radial portion 12b0, a second radial portion 12b2, an axial portion 12b3, and a bent portion 12b4.
  • the first radial portion 12b0 and the second radial portion 12b2 both extend in the radial direction R and the second radial portion 12b2 is located radially inward of the first radial portion 12b0.
  • One end of the axial portion 12b3 is coupled to the first radial portion 12b0 and the axial portion 12b3 extends axially outward in the axial direction A, and the bent portion 12b4 extends toward the axially inner side from the other end of the axial portion 12b3 while facing the diameter The inner side extends and the bent portion 12b4 is coupled to the second radial portion 12b2.
  • the structure such as the second seal cover portion 132 described in the first embodiment can be formed by the axial portion 12b3 and the bent portion 12b4.
  • the cartridge sealing structure 1 employs a centrifugal seal, a pump seal, a labyrinth seal, a gap seal, and a seal lip seal to ensure good sealing performance to the oil medium.
  • the technical solution of the cartridge sealing structure 1 of the present invention has been explained in detail by the description of the above specific embodiments. Further, the present invention also provides a tapered roller bearing using the above-described cartridge type sealing structure 1.
  • the tapered roller bearing includes an inner ring and an outer ring which are rotatable relative to each other, and a skeleton 12 (a skeleton axial portion 12a) of the seal ring of the cartridge sealing structure 1 is fixed to the outer ring, and a slinger 11 of the cartridge sealing structure 1 (The slinger axial portion 11a0) is fixed to the inner ring.
  • the cartridge sealing structure 1 of the present invention can be used not only for tapered roller bearings in the railway field, but also for other types of bearings in other fields, and even for two components capable of rotating together with sealing requirements. The seal between.
  • the type and number of the main seal lip 133 and the dust lip 134 of the present invention are not limited to the above-described specific embodiments, but the type and number of the main seal lip 133 and the dust lip 134 may be provided as needed.
  • the second centrifugal structure described above may have only the second bent portion 11b1 without the third bent portion 11b2.
  • the present invention provides a cartridge type sealing structure which improves the sealing effect of the oil medium and improves the effect of preventing entry of foreign matter, and the cartridge sealing structure is compact in the axial direction.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
  • Sealing Of Bearings (AREA)
  • Rolling Contact Bearings (AREA)
  • Sealing With Elastic Sealing Lips (AREA)

Abstract

一种盒式密封结构（1），盒式密封结构（1）整体为环状，盒式密封结构（1）包括抛油环（11）和密封环，密封环包括骨架（12）及附着于该骨架（12）的密封部（13），抛油环（11）具有沿轴向延伸的抛油环（11）轴向部分，抛油环（11）还具有比抛油环（11）轴向部分靠轴向内侧的第一离心结构，第一离心结构具有朝向轴向内侧延伸的同时朝向径向外侧延伸的第一弯折部（11a1），并且密封部（13）包括与第一弯折部（11a1）间隔开地配置在第一弯折部（11a1）的径向外侧的第一密封盖部（131），第一密封盖部（131）在轴向上朝向轴向内侧至少延伸到与第一弯折部（11a1）平齐的位置。还公开了一种圆锥滚子轴承，其包括盒式密封结构（1）。该盒式密封结构（1）和圆锥滚子轴承改善了对油介质的密封效果。

Description

盒式密封结构及圆锥滚子轴承
相关申请的引用
本发明要求2016年6月27日在中国提交的、名称为“盒式密封结构及圆锥滚子轴承”、申请号为201620652889.6的实用新型专利申请的优先权，该申请的全部内容通过引用并入本文。
技术领域
本发明涉及密封领域，更具体地涉及主要用于铁路领域内的轴承密封的盒式密封结构以及采用该盒式密封结构的圆锥滚子轴承。
背景技术
在现有技术中，圆锥滚子轴承包括在轴向两侧设置的两个盒式密封结构。各盒式密封结构整体呈环状，用于密封轴承内的油介质(通常指润滑油)并防止外侧的异物进入轴承。
图1示出了现有技术的盒式密封结构的局部剖视示意图，其示出了该盒式密封结构的轴向剖视构造的一半。现有技术的盒式密封结构10包括用于与轴承的内圈固定的抛油环101和用于与轴承的外圈固定的密封环，该密封环包括与外圈固定的骨架102以及附着于骨架102的密封部103，该密封部103具有多个朝向抛油环101延伸的密封唇(包括主密封唇105和多个副密封唇106)。
如图1所示，在抛油环101的沿轴向A延伸的抛油环轴向部分101a的轴向内侧设置有弯折部104，弯折部104沿着径向R朝向径向外侧延伸，该弯折部104与密封部103之间在轴向A上仅具有较小的间隙，该间隙在轴向A上的尺寸是恒定的，这样使得处于盒式密封结构10的轴向内侧的油介质不易进入该 盒式密封结构10。
但是，本发明人发现在实际应用中，油介质不可避免地从上述间隙进入盒式密封结构10中。一旦油介质进入盒式密封结构10之后，油介质在该盒式密封结构10中只能朝向轴向外侧流动而不会返回到轴承内部。这样，必然导致了油介质从盒式密封结构10中漏出，因此，现有技术的盒式密封结构10对油介质的密封效果不能令人满意。
发明内容
基于上述现有技术的缺陷而做出了本发明，本发明的目的在于提供一种能够改善油介质密封效果的盒式密封结构以及具有该盒式密封结构的圆锥滚子轴承。
为了实现上述目的，本发明采用如下的技术方案。
本发明提供了一种如下的盒式密封结构，所述盒式密封结构整体为环状，所述盒式密封结构包括抛油环和密封环，所述密封环包括骨架及附着于该骨架的密封部，所述抛油环具有沿轴向延伸的抛油环轴向部分，所述抛油环还具有比所述抛油环轴向部分靠轴向内侧的第一离心结构，所述第一离心结构具有朝向轴向内侧延伸的同时朝向径向外侧延伸的第一弯折部，并且所述密封部包括与所述第一弯折部间隔开地配置在所述第一弯折部的径向外侧的第一密封盖部，所述第一密封盖部在轴向上朝向轴向内侧至少延伸到与所述第一弯折部平齐的位置。
优选地，所述第一密封盖部的径向内侧面沿轴向延伸。
更优选地，在与所述第一密封盖部相邻的轴向外侧部位处，所述密封部设置有与所述抛油环轴向部分相对的多个泵油槽，所述多个泵油槽沿周向间隔开地设置，并且所述泵油槽的径向外侧面与所述第一密封盖部的径向内侧面相连，所述泵油槽的径向外侧面从所述第一密封盖部的径向内侧面起朝向 轴向外侧延伸的同时朝向径向内侧延伸。
进一步，优选地，所述密封部还包括位于所述泵油槽的轴向外侧的主密封唇和多个副密封唇，所述主密封唇和所述多个副密封唇朝向所述抛油环延伸。
进一步，优选地，所述主密封唇为与所述抛油环接触的接触式密封唇，所述主密封唇朝向轴向外侧延伸的同时朝向径向内侧延伸，并且所述多个副密封唇均为非接触式密封唇，所述多个副密封唇包括：至少两个迷宫唇，所述至少两个迷宫唇沿着径向朝向所述抛油环轴向部分延伸并且位于所述主密封唇的轴向内侧，在所述至少两个迷宫唇中的两个相邻的迷宫唇之间形成朝向径向外侧凹陷的迷宫槽；以及防尘唇，所述防尘唇朝向轴向外侧延伸的同时朝向径向外侧延伸，所述防尘唇位于所述主密封唇的径向外侧。
优选地，所述抛油环还具有沿径向延伸的抛油环径向部分以及比所述抛油环径向部分靠径向外侧的第二离心结构，所述第二离心结构具有朝向轴向外侧延伸的同时朝向径向外侧延伸的第二弯折部，所述密封环包括与所述第二弯折部间隔开地配置在所述第二弯折部的径向外侧的第二密封盖部，所述第二密封盖部在轴向上朝向轴向外侧至少延伸到与所述第二弯折部平齐的位置。
更优选地，所述第二弯折部与所述第二密封盖部之间具有间隙，所述间隙从轴向内侧朝向轴向外侧逐渐减小。
更优选地，所述第二离心结构还具有朝向轴向外侧延伸的同时朝向径向内侧延伸的第三弯折部，所述第三弯折部位于所述第二弯折部和所述抛油环径向部分之间并与所述第二弯折部和所述抛油环径向部分连接。
更优选地，所述骨架具有骨架径向部分，所述骨架径向部分包括轴向部分和折曲部分，所述轴向部分沿轴向朝向轴向外侧延伸，所述折曲部分从所述轴向部分的径向外侧端朝向轴向内侧延伸的同时朝向径向内侧延伸，使得 由所述轴向部分和所述折曲部分形成所述第二密封盖部，或者所述密封部包括所述第二密封盖部。
本发明还提供了一种如下的圆锥滚子轴承，所述圆锥滚子轴承包括能够彼此相对转动的内圈和外圈以及以上技术方案中任意一项技术方案所述的盒式密封结构，所述盒式密封结构的密封环的骨架固定于所述外圈，所述盒式密封结构的抛油环固定于所述内圈。
通过采用上述技术方案，本发明的盒式密封结构能够通过增加油介质泵送效果及防止油介质流入盒式密封结构来改善盒式密封结构对油介质的密封效果，采用本发明的盒式密封结构的圆锥滚子轴承能够获得同样的效果。
附图说明
图1示出了现有技术的盒式密封结构的局部剖视示意图，其示出了该盒式密封结构的轴向剖视构造的一半。
图2示出了根据本发明第一实施方式的盒式密封结构的局部剖视示意图，其示出了该盒式密封结构的轴向剖视构造的一半。
图3示出了根据本发明第二实施方式的盒式密封结构的局部剖视示意图，其示出了该盒式密封结构的轴向剖视构造的一半。
图4示出了根据本发明第三实施方式的盒式密封结构的局部剖视示意图，其示出了该盒式密封结构的轴向剖视构造的一半。
附图标记说明
10盒式密封结构  101抛油环  101a抛油环轴向部分  102骨架  103密封部  104弯折部  105主密封唇  106副密封唇
1盒式密封结构  11抛油环  11a0抛油环轴向部分  11a1第一弯折部  11b0抛油环径向部分  11b1第二弯折部  11b2第三弯折部  12骨架  12a骨架轴向部分  12b骨架径向部分  12b0第一径向部分  12b1 连接部分  12b2第二径向部分  12b3轴向部分  12b4折曲部分  13密封部  131第一密封盖部  131a径向内侧面  132第二密封盖部  132a径向内侧面  133主密封唇  134防尘唇  135迷宫唇  136迷宫槽  137泵油槽  137a径向外侧面  138拆卸孔
R径向  A轴向
具体实施方式
以下参照说明书附图来具体说明本发明的具体实施方式。在附图中，标记A所表示的“轴向”为盒式密封结构的中心轴线的方向；标记R所表示的“径向”为盒式密封结构的径向。另外，在图1至图4中，图中的右侧为轴向外侧，图中的左侧为轴向内侧；图中的上侧为径向外侧，图中的下侧为径向内侧。例如润滑油等的油介质位于轴向内侧，例如灰尘等的异物位于轴向外侧。
(第一实施方式)
如图2所示，根据本发明的第一实施方式的盒式密封结构1整体呈环形形状。该盒式密封结构1包括用于固定于轴承的内圈的抛油环11和用于固定于轴承的外圈的密封环。该密封环包括用于固定于轴承的外圈的骨架12和附着于该骨架12的密封部13。抛油环11和骨架12由例如金属的硬质材料制成，密封部13由例如橡胶的弹性材料制成。
抛油环11具有沿轴向A延伸的抛油环轴向部分11a0和沿径向R延伸的抛油环径向部分11b0。在本实施方式中，抛油环轴向部分11a0用于固定于轴承的内圈。
骨架12具有沿轴向A延伸的骨架轴向部分12a和骨架径向部分12b。在本实施方式中，骨架轴向部分12a用于固定于轴承的外圈，密封部13附着于该骨架径向部分12b。骨架径向部分12b包括第一径向部分12b0、第二径向部分 12b2以及位于第一径向部分12b0和第二径向部分12b2之间的连接部分12b1。第一径向部分12b0和第二径向部分12b2均沿径向R延伸且第二径向部分12b2位于第一径向部分12b0的径向内侧，连接部分12b1与第一径向部分12b0和第二径向部分12b2均连接并且连接部分12b1朝向轴向外侧延伸的同时朝向径向内侧延伸。
在本实施方式中，抛油环11具有从抛油环轴向部分11a0的轴向最内端延伸出的第一离心结构和从抛油环径向部分11b0的径向最外端延伸出的第二离心结构。第一离心结构用于将进入盒式密封结构1的油介质泵送回轴承内部(即向轴向内侧泵送油介质)，第二离心结构用于将进入盒式密封结构1的异物泵送到外部(即向轴向外侧泵送异物)。
第一离心结构具有从抛油环轴向部分11a0的轴向最内端起延伸的第一弯折部11a1。该第一弯折部11a1的延伸方向相对于轴向A和径向R两个方向均倾斜，即该第一弯折部11a1朝向轴向内侧延伸的同时朝向径向外侧延伸。借助于第一弯折部11a1(其轴向外侧面)，在盒式密封结构1的抛油环11相对于密封环转动的过程中，通过离心力容易使流入盒式密封结构1中的油介质沿着该第一弯折部11a1被泵送到轴向内侧。这样，改善了盒式密封结构1对油介质的密封效果。
第二离心结构具有从抛油环径向部分11b0的径向最外端起顺次连接的第三弯折部11b2和第二弯折部11b1。第三弯折部11b2和第二弯折部11b1的延伸方向均相对于轴向A和径向R两个方向倾斜。即第三弯折部11b2朝向轴向内侧延伸的同时朝向径向外侧延伸，第二弯折部11b1朝向轴向外侧延伸的同时朝向径向外侧延伸。这样，通过第二弯折部11b1(其径向外侧面)可以将异物泵送到轴向外侧，改善了盒式密封结构1对异物的密封效果。另外，通过设置第三弯折部11b2可以使得第二离心结构不会延伸到抛油环径向部分11b0的轴向外侧，从而保证整个盒式密封结构1的结构紧凑。
在本实施方式中，密封部13包括第一密封盖部131和第二密封盖部132。第一密封盖部131用于从径向外侧盖住上述第一离心结构(第一弯折部11a1)，从而保证轴承内侧的油介质难以通过第一密封盖部131与第一离心结构之间的间隙进入盒式密封结构1。这样，进一步改善了盒式密封结构1对油介质的密封效果。第二密封盖部132用于从径向外侧盖住上述第二离心结构(第二弯折部11b1和第三弯折部11b2)，从而保证轴向外侧的异物难以通过第二密封盖部132与第二离心结构之间的间隙进入盒式密封结构1。这样，进一步改善了盒式密封结构1对异物的密封效果。
也就是说，使得第一密封盖部131位于第一离心结构的径向外侧且在轴向A上朝向轴向内侧至少延伸到与第一离心结构平齐的位置，使得第二密封盖部132位于第二离心结构的径向外侧且在轴向A上朝向轴向外侧至少延伸到与第二离心结构平齐的位置。优选地，使第一密封盖部131与第一离心结构之间的间隙以及第二密封盖部132与第二离心结构之间的间隙尽可能地小，这样能够更好地实现防止异物和油介质进入盒式密封结构1的目的。可以形成如下结构：第一密封盖部131的径向内侧面131a沿着轴向A(与轴向A大致平行)地延伸，保证第一密封盖部131(径向内侧面131a)与第一离心结构之间的间隙足够小；第二密封盖部132(径向内侧面132a)与第二弯折部11b1(其径向外侧面)之间的间隙从轴向内侧朝向轴向外侧呈渐缩的形状，即该间隙从轴向内侧朝向轴向外侧越来越小。
另外，为了提高盒式密封结构1对油介质的泵送效果，在本实施方式中，在与第一密封盖部131相邻的轴向外侧部位处，密封部13设置有与抛油环轴向部分11a0相对的多个泵油槽137，多个泵油槽137沿周向间隔开地设置，泵油槽137的径向外侧面137a与第一密封盖部131的径向内侧面131a相连，并且从第一密封盖部131的径向内侧面131a朝向轴向外侧延伸的同时朝向径向内侧延伸。这样，即使油介质通过第一密封盖部131与第一离心结构之间的间 隙进入盒式密封结构1中，在抛油环11相对于密封环转动的过程中，一部分油介质能够通过第一离心结构泵送到轴向内侧，另一部分油介质在离心力的作用下沿着泵油槽137的径向外侧面137a泵送到轴向内侧。这样，增强了盒式密封结构1对油介质的泵送效果，进而进一步改善了盒式密封结构1对油介质的密封性。为了减小盒式密封结构1的在轴向A上的尺寸，使得泵油槽137位于骨架径向部分12b的第二径向部分12b2的轴向内侧。
在本实施方式中，密封部13还包括朝向抛油环轴向部分11a0延伸的主密封唇133以及多个副密封唇。该多个副密封唇包括朝向第三弯折部11b2延伸的防尘唇134和朝向抛油环轴向部分11a0延伸的两个迷宫唇135。
在本实施方式中，主密封唇133位于第二密封盖部132的径向内侧，主密封唇133朝向轴向外侧延伸的同时朝向径向内侧延伸，主密封唇133优选为与抛油环轴向部分11a0接触的接触式密封唇。主密封唇133用于将进入盒式密封结构1中的油介质和异物分隔开。
在本实施方式中，在径向R上，防尘唇134位于第二密封盖部132与主密封唇133之间，即防尘唇134位于第二密封盖部132的径向内侧且位于主密封唇133的径向外侧。防尘唇134朝向轴向外侧延伸的同时朝向径向外侧延伸，防尘唇134优选为非接触式密封唇。这样，防尘唇134可以在一定时间内保持进入盒式密封结构1中的异物，然后通过第二离心结构与第二密封盖部132的径向内侧面132a之间的间隙将异物排出。另外，通过第二密封盖部132、第二弯折部11b1、第三弯折部11b2和防尘唇134所包围的空间形成弯折的通道，该通道的总长度较长，进一步防止了异物的进入。
在本实施方式中，在轴向A上，两个迷宫唇135位于主密封唇133和泵油槽137之间，即两个迷宫唇135位于主密封唇133的轴向内侧且位于泵油槽137的轴向外侧，两个迷宫唇135沿着径向朝向抛油环轴向部分11a0延伸。在两个迷宫唇135之间形成朝向径向外侧凹陷的迷宫槽136，通过两个迷宫唇135 与抛油环轴向部分11a0之间的空间以及迷宫槽136与抛油环轴向部分11a0之间的空间形成了迷宫结构(使得油介质向轴向外侧流动所需要通过的空间从小变大再变小的结构)，用于阻挡油介质在盒式密封结构1中向轴向外侧流动。
此外，在本实施方式中，在骨架径向部分12b设置有沿周向间隔布置的多个拆卸孔138(例如椭圆形的拆卸孔)，通过该拆卸孔138方便拆卸该盒式密封结构1。
在本实施方式中，盒式密封结构1通过采用离心密封、泵送密封、迷宫密封、间隙密封以及密封唇密封来确保对油介质的良好的密封性能。
(第二实施方式)
如图3所示，本发明的第二实施方式的结构与本发明的第一实施方式的结构类似，它们的不同之处在于：在第二实施方式中，未设置泵油槽137，而设置有三个迷宫唇135以及两个迷宫槽136(形成加强的迷宫密封)；并且第二密封盖部132的径向内侧面沿着轴向延伸。
首先，通过如上所述地设置三个迷宫唇135以及两个迷宫槽136，能够使得三个迷宫唇135与抛油环轴向部分11a0之间的空间以及两个迷宫槽136与抛油环轴向部分11a0之间的空间形成了加强的迷宫结构，该加强的迷宫结构阻挡油介质向轴向外侧流动的效果更加显著，从而可以不像第一实施方式那样设置泵油槽137。
其次，由于通过第二密封盖部132、第二弯折部11b1、第三弯折部11b2和防尘唇134形成了较长的弯折通路，异物在未进入盒式密封结构1的内部之前就可以被排出到外部，因此可以不像第一实施方式那样地形成第二密封盖部132的径向内侧面。
在本实施方式中，盒式密封结构1采用了离心密封、加强的迷宫密封、间隙密封以及密封唇密封来确保对油介质的良好的密封性能。
(第三实施方式)
如图4所示，本发明的第三实施方式的结构与本发明的第一实施方式的结构类似，它们的不同之处在于：在第三实施方式中，骨架径向部分12b形成有朝向第二离心结构弯曲的弯曲结构，通过弯曲结构形成与第一实施方式的第二密封盖部132相同的结构。
由于在沙漠等严酷环境中，外部异物对盒式密封结构1的侵害非常严重，由橡胶制成的第二密封盖部132的使用寿命可能很短，因此通过将由金属制成的骨架径向部分12b的一部分形成如图4所示那样的弯曲结构来形成第二密封盖部，从而大大延长了第二密封盖部的使用寿命。
具体地，骨架径向部分12b包括第一径向部分12b0、第二径向部分12b2、轴向部分12b3和折曲部分12b4。第一径向部分12b0和第二径向部分12b2均沿径向R延伸且第二径向部分12b2位于第一径向部分12b0的径向内侧。轴向部分12b3的一端与第一径向部分12b0连接且轴向部分12b3沿轴向A朝向轴向外侧延伸，折曲部分12b4从轴向部分12b3的另一端朝向轴向内侧延伸的同时朝向径向内侧延伸并且折曲部分12b4与第二径向部分12b2连接。这样，可以通过轴向部分12b3和折曲部分12b4形成如第一实施方式所述的第二密封盖部132那样的结构。
在本实施方式中，盒式密封结构1采用了离心密封、泵送密封、迷宫密封、间隙密封以及密封唇密封来确保对油介质的良好的密封性能。
通过上述具体实施方式的说明已经详细阐述了本发明的盒式密封结构1的技术方案。另外，本发明还提供了采用上述盒式密封结构1的圆锥滚子轴承。该圆锥滚子轴承包括能够彼此相对转动的内圈和外圈，盒式密封结构1的密封环的骨架12(骨架轴向部分12a)固定于外圈，盒式密封结构1的抛油环11(抛油环轴向部分11a0)固定于内圈。
虽然以上具体实施方式中详细阐述了本发明的具体实施方式，但是仍然 需要说明的是：
1.本发明的盒式密封结构1不仅能够用于铁路领域内的圆锥滚子轴承，还可以用于其它领域的其它类型的轴承，甚至可以用于具有密封需求的能够彼此转动的两个组件之间的密封。
2.本发明的主密封唇133和防尘唇134的种类和数量不限于上述具体实施方式，而是可以根据需要来设置主密封唇133和防尘唇134的种类和数量。
3.在不考虑盒式密封结构1的轴向A上的宽度的情况下，可以使上述第二离心结构仅具有第二弯折部11b1而没有第三弯折部11b2。
通过采用上述技术方案，本发明提供了一种改善了油介质密封效果并改善了防止异物进入的效果的盒式密封结构，并且该盒式密封结构在轴向上的尺寸紧凑。
本发明的保护范围不限于上述具体实施方式中的实施例，而是只要满足本发明的权利要求的技术特征的组合就落入了本发明的保护范围中。

Claims (10)

  1. 一种盒式密封结构，所述盒式密封结构整体为环状，所述盒式密封结构包括抛油环和密封环，所述密封环包括骨架及附着于该骨架的密封部，所述抛油环具有沿轴向延伸的抛油环轴向部分，其特征在于，
    所述抛油环还具有比所述抛油环轴向部分靠轴向内侧的第一离心结构，所述第一离心结构具有朝向轴向内侧延伸的同时朝向径向外侧延伸的第一弯折部，并且
    所述密封部包括与所述第一弯折部间隔开地配置在所述第一弯折部的径向外侧的第一密封盖部，所述第一密封盖部在轴向上朝向轴向内侧至少延伸到与所述第一弯折部平齐的位置。
  2. 根据权利要求1所述的盒式密封结构，其特征在于，所述第一密封盖部的径向内侧面沿轴向延伸。
  3. 根据权利要求2所述的盒式密封结构，其特征在于，在与所述第一密封盖部相邻的轴向外侧部位处，所述密封部设置有与所述抛油环轴向部分相对的多个泵油槽，所述多个泵油槽沿周向间隔开地设置，并且
    所述泵油槽的径向外侧面与所述第一密封盖部的径向内侧面相连，所述泵油槽的径向外侧面从所述第一密封盖部的径向内侧面起朝向轴向外侧延伸的同时朝向径向内侧延伸。
  4. 根据权利要求3所述的盒式密封结构，其特征在于，所述密封部还包括位于所述泵油槽的轴向外侧的主密封唇和多个副密封唇，所述主密封唇和所述多个副密封唇朝向所述抛油环延伸。
  5. 根据权利要求4所述的盒式密封结构，其特征在于，
    所述主密封唇为与所述抛油环接触的接触式密封唇，所述主密封唇朝向轴向外侧延伸的同时朝向径向内侧延伸，并且
    所述多个副密封唇均为非接触式密封唇，所述多个副密封唇包括：至少两个迷宫唇，所述至少两个迷宫唇沿着径向朝向所述抛油环轴向部分延伸并 且位于所述主密封唇的轴向内侧，在所述至少两个迷宫唇中的两个相邻的迷宫唇之间形成朝向径向外侧凹陷的迷宫槽；以及防尘唇，所述防尘唇朝向轴向外侧延伸的同时朝向径向外侧延伸，所述防尘唇位于所述主密封唇的径向外侧。
  6. 根据权利要求1至5中任一项所述的盒式密封结构，其特征在于，所述抛油环还具有沿径向延伸的抛油环径向部分以及比所述抛油环径向部分靠径向外侧的第二离心结构，所述第二离心结构具有朝向轴向外侧延伸的同时朝向径向外侧延伸的第二弯折部，
    所述密封环包括与所述第二弯折部间隔开地配置在所述第二弯折部的径向外侧的第二密封盖部，所述第二密封盖部在轴向上朝向轴向外侧至少延伸到与所述第二弯折部平齐的位置。
  7. 根据权利要求6所述的盒式密封结构，其特征在于，所述第二弯折部与所述第二密封盖部之间具有间隙，所述间隙从轴向内侧朝向轴向外侧逐渐减小。
  8. 根据权利要求6所述的盒式密封结构，其特征在于，所述第二离心结构还具有朝向轴向外侧延伸的同时朝向径向内侧延伸的第三弯折部，所述第三弯折部位于所述第二弯折部和所述抛油环径向部分之间并与所述第二弯折部和所述抛油环径向部分连接。
  9. 根据权利要求6所述的盒式密封结构，其特征在于，所述骨架具有骨架径向部分，所述骨架径向部分包括轴向部分和折曲部分，所述轴向部分沿轴向朝向轴向外侧延伸，所述折曲部分从所述轴向部分的径向外侧端朝向轴向内侧延伸的同时朝向径向内侧延伸，使得由所述轴向部分和所述折曲部分形成所述第二密封盖部，或者
    所述密封部包括所述第二密封盖部。
  10. 一种圆锥滚子轴承，其特征在于，所述圆锥滚子轴承包括能够彼此 相对转动的内圈和外圈以及权利要求1至9中任一项所述的盒式密封结构，所述盒式密封结构的密封环的骨架固定于所述外圈，所述盒式密封结构的抛油环固定于所述内圈。
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CN205918768U (zh) 2016-06-27 2017-02-01 舍弗勒技术股份两合公司 盒式密封结构及圆锥滚子轴承
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JP7263855B2 (ja) * 2019-03-13 2023-04-25 株式会社ジェイテクト 転がり軸受装置
CN111219417A (zh) * 2020-02-18 2020-06-02 南京利德东方橡塑科技有限公司 一种带导电橡胶的铁路轴承用导电油封
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IT202000023131A1 (it) * 2020-10-01 2022-04-01 Skf Metal Stamping S R L Dispositivo di tenuta per unità cuscinetto
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AU2017287189A1 (en) 2018-09-27
RU2737819C2 (ru) 2020-12-03
RU2019102072A (ru) 2020-07-28
CN205918768U (zh) 2017-02-01
EP3477137A1 (en) 2019-05-01
ZA201806607B (en) 2020-01-29
RU2019102072A3 (zh) 2020-09-09
US10731706B2 (en) 2020-08-04
BR112018076975A2 (pt) 2019-04-16

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