EP4226058A1 - Abgedichtetes wälzlager - Google Patents
Abgedichtetes wälzlagerInfo
- Publication number
- EP4226058A1 EP4226058A1 EP21743037.0A EP21743037A EP4226058A1 EP 4226058 A1 EP4226058 A1 EP 4226058A1 EP 21743037 A EP21743037 A EP 21743037A EP 4226058 A1 EP4226058 A1 EP 4226058A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bearing
- axial
- radial
- sealing
- seals
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
- 238000007789 sealing Methods 0.000 claims abstract description 122
- 230000002787 reinforcement Effects 0.000 claims abstract description 17
- 238000005096 rolling process Methods 0.000 claims abstract description 17
- 229920001971 elastomer Polymers 0.000 claims abstract description 11
- 239000000806 elastomer Substances 0.000 claims abstract description 11
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000000576 coating method Methods 0.000 abstract description 7
- 239000011248 coating agent Substances 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000009434 installation Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
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
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
- F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
-
- 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
- F16C33/784—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
- F16C33/7843—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 single annular sealing disc
- F16C33/7853—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 single annular sealing disc with one or more sealing lips to contact the inner race
-
- 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
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
-
- 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
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
- F16C2240/60—Thickness, e.g. thickness of coatings
-
- 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
- F16C2326/20—Land vehicles
- F16C2326/28—Bicycle propulsion, e.g. crankshaft and its support
Definitions
- the invention relates to a sealed roller bearing according to the features forming the preamble of patent claim 1, and it can be used particularly advantageously on radial deep groove ball bearings that are used in a bottom bracket for a bicycle with an electric motor support drive.
- bottom brackets are those bearings on a bicycle in which the bottom bracket shaft, which is connected at its ends to the pedal cranks, is mounted.
- Such bottom brackets consist in most cases of at least two roller bearings, which support the bottom bracket shaft on both sides of the bottom bracket shell.
- the roller bearings of the bottom bracket are formed by exchangeable bearing units, which mostly consist of radial grooved ball bearings sealed on both sides due to their low frictional resistance.
- Such a sealed deep groove ball bearing is already known, for example, from publication DE 10 2005 029 936 A1.
- This deep groove ball bearing consists in a known manner of an inner bearing ring with a raceway arranged on its outer lateral surface, an outer bearing ring with a raceway arranged on its inner lateral surface and of a large number of rolling elements rolling on the raceways between the bearing rings, which are separated by a cage at regular intervals be held together.
- two circumferential annular grooves are machined axially on both sides next to the raceway in the outer bearing ring into the inner lateral surface of the outer bearing ring, in which two seals, each consisting of a circular reinforcement and an elastomer coating, are fastened with their outer diameter are.
- the seals On the part facing the inner bearing ring, the seals have an elastic carrier part, from which two sealing lips each extend, which interact with an undercut located in the inner bearing ring, with the undercut being designed asymmetrically in such a way that a first shoulder and a first shoulder adjoining the raceway and an external second shoulder are formed, which differ in their diameter.
- an axially inwardly directed first sealing lip rubs against an inner wall of the undercut, while a second axially outwardly directed sealing lip forms a first gap seal with the outer shoulder.
- a third inwardly directed sealing lip, which forms a second gap seal with the first shoulder is also arranged at a radial distance from the first two sealing lips.
- the seals of the deep groove ball bearing disclosed in US Pat. No. 5,037,213 A have improved sealing performance.
- This deep groove ball bearing also consists of an inner bearing ring with an outer raceway, an outer bearing ring with an inner raceway and a large number of rolling elements rolling between the bearing rings, which are held at equal distances from one another by a cage.
- two circumferential annular grooves are worked into the inner lateral surface of the outer bearing ring axially on both sides next to the raceway in the outer bearing ring, in which two seals, each consisting of a circular reinforcement and an elastomer coating, are fastened with their outer diameter.
- the seals each have a first radial sealing lip that rests against the axial surfaces of two undercuts located next to the raceway in the inner bearing, a second axial sealing lip that rests on the radial surfaces of the undercuts in the inner bearing, and a third axial sealing lip that forms a sealing gap together with the undercuts in the inner bearing sealing lip up.
- the invention is therefore based on the object of designing a sealed rolling bearing whose seals have improved sealing performance compared to a standard bearing with the same installation space and reliably prevent dirt water from entering the bearing interior.
- this object is achieved in a sealed roller bearing according to the preamble of claim 1 in such a way that the radial sealing lips and the axial sealing lips of both seals in the profile cross-section are essentially radially aligned and axially spaced apart from one another and are formed on the ends of the axial connections of the elastomer casings that each enclose the inner diameter region of their reinforcements are, wherein the radial thickness of each axial connection is smaller than the axial width of each radial sealing lip and each axial sealing lip.
- Preferred configurations and advantageous developments of the sealed roller bearing designed according to the invention are described in subclaims 2 to 6.
- the radial sealing lips of the seals have a rectangular profile cross-section and, in the installed state, form central curvatures directed towards the bearing with an inner profile edge of their free ends, each circumferential sealing edges, which on the axial surfaces of the undercuts rest in the inner bearing ring.
- the central curvatures of the radial sealing lips arise from the fact that their inner diameters in the stretched state are slightly smaller than the diameters of the axial surfaces of the undercuts in the inner bearing ring, in order to generate a constant contact pressure on the sealing edges of the radial sealing lips.
- another feature of the sealed rolling bearing designed according to the invention is that the axial sealing lips of the seals have a rectangular profile cross-section with free ends angled toward the bearing and, when installed, form circumferential sealing surfaces with the faces of their free ends, which are attached to the radial surfaces of the undercuts on the inside bearing ring.
- the axial distance between the end faces of the free ends and the side surfaces of the inner bearing ring when the seals are not installed is greater than the axial distance of the radial surfaces of the Undercuts to the side surfaces of the inner bearing ring.
- the sealed roller bearing designed according to the invention is also characterized in that the sealing edges on the radial sealing lips and the sealing surfaces on the axial sealing lips of the seals are arranged at least approximately on the same radial plane or in the same diameter range of the seals. This allows optimal use of the radial installation space available for the seals possible without critical weakening of the residual wall thickness of the individual sealing lips of the seals.
- the third sealing lips of the seals are arranged in the profile cross-section above the axial sealing lips and are axially aligned towards the inside of the bearing and, in the installed state, together with the axial sealing lips, the sealing gaps to the radial surfaces of the undercuts in the inner bearing ring form.
- the axial extent of the third sealing lips corresponds approximately to the axial extent of the axial sealing lips of the seals, so that ring-shaped sealing gaps are formed in each case, which have narrow openings towards the bearing interior.
- the reinforcements of the seals in the profile cross section each have outer end regions bent at right angles from a radial central part towards the bearing and inner end regions bent at an angle from the central part towards the bearing.
- the direct inner diameter area of the reinforcements is ultimately aligned radially again in order to be able to form the connections of the axial sealing lips and radial sealing lips of the seals with a uniform elastomer thickness.
- the sealed roller bearing designed according to the invention thus has the advantage over the sealed roller bearings known from the prior art that it encloses the inner diameter area of their reinforcements due to a substantially radial alignment and axial spacing of the radial sealing lips and the axial sealing lips of both seals and due to their molding axial connections of the elastomer coatings, the radial thickness of which is smaller than the axial width of each radial sealing lip and each axial sealing lip, can no longer lead to a mutual influence of the sealing lips, which in the static and dynamic state of the seals leads to discontinuities in the contacts of the first and second sealing lip pen and in the gap geometry of the third sealing lip, so that the ingress of dirty water into the interior of the bearing is ruled out.
- FIG. 1 shows an enlarged partial view of a cross section through a sealed roller bearing designed according to the invention
- FIG. 2 shows a cross-sectional view of a seal of the roller bearing designed according to the invention according to detail X in FIG. 1;
- Figure 3 shows an enlarged representation of the sealing lips of the seal according to detail Z in Figure 2.
- Figure 1 clearly shows a roller bearing 1 designed as a radial deep groove ball bearing, which consists of an inner bearing ring 2 with a raceway 4 arranged on its outer lateral surface 3, an outer bearing ring 5 with a raceway 7 arranged on its inner lateral surface 6, and a large number between the bearing rings 2, 5 on the raceways 4, 7 rolling rolling elements 8, which are held by an unspecified cage at equal distances from each other.
- a roller bearing 1 designed as a radial deep groove ball bearing, which consists of an inner bearing ring 2 with a raceway 4 arranged on its outer lateral surface 3, an outer bearing ring 5 with a raceway 7 arranged on its inner lateral surface 6, and a large number between the bearing rings 2, 5 on the raceways 4, 7 rolling rolling elements 8, which are held by an unspecified cage at equal distances from each other.
- the radial thickness SA of each axial connection 31, 32 is smaller than the axial width BR, BA of each radial sealing lip 23, 24 and each axial sealing lip 25, 26, in order to prevent the sealing lips 23, 24 and 25, 26 from influencing each other in the static and dynamic state of the seals 11, 12 leads to discontinuities in the contacts of the radial and axial sealing lips 23, 24, 25, 26 and in the gap geometry of the third sealing lip 27, 28 to avoid.
- the illustration according to FIG. 3 also shows that the radial sealing lips 23, 24 of the seals 11, 12 have a rectangular profile cross-section and, in the installed state, form inward-facing curves 33, 34 with an inner profile edge of their free ends, each forming circumferential sealing edges 35, 36 which rest on the axial surfaces 19, 20 of the undercuts 17, 18 in the inner bearing ring 2.
- the axial sealing lips 25, 26 of the seals 11, 12 also clearly have a rectangular profile cross-section, but with free ends 37, 38 angled inwards towards the bearing and, when installed, form with the end faces of their free ends 37, 38 circumferential sealing surfaces 39, 40, which the radial surfaces 23, 24 of the undercuts 17, 18 in the inner bearing ring 2 abut.
- sealing edges 35, 36 on the radial sealing lips 23, 24 and the sealing surfaces 39, 40 on the axial sealing lips 25, 26 are at least approximately on the same radial plane or are arranged in the same diameter range of the seals 11, 12, so that the radial installation space available for the seals 11, 12 is optimally used without critically weakening the remaining wall thickness of the individual sealing lips 23, 24, 25, 26.
- the third sealing lips 27, 28 of the seals 11, 12 are arranged in the profile cross-section above the axial sealing lips 25, 26 and are axially aligned towards the bearing and in the installed state, together with the axial sealing lips 25, 26, the sealing gaps 29, 30 to the Radial surfaces 21, 22 of the undercuts 17, 18 in the inner bearing ring 2 form.
- the axial extent of the third sealing lips 27, 28 corresponds approximately to the axial extent of the axial sealing lips 25, 26 of the seals 11, 12, so that annular sealing gaps 29, 30 with narrow openings to the bearing interior arise.
- the profile cross-section of the reinforcements 13, 14 of the seals 11, 12 each extends from a radial center part 41, 42 at right angles to the bearing inside, from outer end regions 43, 44 and from the center part 41, 42 to the bearing inside at an angle angled inner end portions 45, 46 have.
- the direct inner diameter area of the reinforcements 13, 14 is ultimately aligned radially again in order to be able to form the connections 31, 32 of the axial sealing lips 25, 26 and radial sealing lips 23, 24 of the seals 11, 12 with a uniform elastomer thickness.
- Roller bearing 26 axial sealing lip on 12 inner bearing ring of 1 27 third sealing lip on 11 outer lateral surface of 2 28 third sealing lip on 12
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
- Sealing Of Bearings (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020125963.8A DE102020125963A1 (de) | 2020-10-05 | 2020-10-05 | Abgedichtetes Wälzlager |
| PCT/DE2021/100581 WO2022073532A1 (de) | 2020-10-05 | 2021-07-05 | Abgedichtetes wälzlager |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4226058A1 true EP4226058A1 (de) | 2023-08-16 |
Family
ID=76971583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21743037.0A Withdrawn EP4226058A1 (de) | 2020-10-05 | 2021-07-05 | Abgedichtetes wälzlager |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20240026928A1 (de) |
| EP (1) | EP4226058A1 (de) |
| KR (1) | KR20230045081A (de) |
| CN (1) | CN116261631A (de) |
| DE (1) | DE102020125963A1 (de) |
| WO (1) | WO2022073532A1 (de) |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3114559A (en) | 1959-02-18 | 1963-12-17 | Gen Motors Corp | Reinforced seal for rotatable members |
| DE3009977A1 (de) * | 1980-03-14 | 1981-09-24 | Nippon Seiko K.K., Tokyo | Dichtungsvorrichtung fuer ein waelzlager |
| JPH022526U (de) | 1988-06-16 | 1990-01-09 | ||
| JP3923547B2 (ja) | 1995-02-20 | 2007-06-06 | 株式会社ジェイテクト | 軸受の密封装置 |
| DE19605179A1 (de) | 1996-02-13 | 1997-08-14 | Schaeffler Waelzlager Kg | Wälzlagerabdichtung mit integriertem Druckausgleich |
| JPH09329148A (ja) * | 1996-06-05 | 1997-12-22 | Nippon Seiko Kk | 密封型転がり軸受 |
| JP2004092733A (ja) * | 2002-08-30 | 2004-03-25 | Nsk Ltd | 密封形転がり軸受 |
| DE602004008158T2 (de) * | 2003-06-30 | 2007-12-13 | Jtekt Corp., Osaka | Wälzlager |
| JP2006336734A (ja) | 2005-06-01 | 2006-12-14 | Nsk Ltd | 密封装置付き転がり軸受 |
| DE102005029936B4 (de) | 2005-06-28 | 2016-01-07 | Schaeffler Technologies AG & Co. KG | Abgedichtetes Wälzlager |
| JP6184096B2 (ja) * | 2012-12-27 | 2017-08-23 | ミネベアミツミ株式会社 | 転がり軸受、スロットルバルブ装置及びアンチロックブレーキ装置 |
| DE102015220137A1 (de) | 2015-10-16 | 2017-04-20 | Aktiebolaget Skf | Wälzlager |
| JP2018162870A (ja) | 2017-03-27 | 2018-10-18 | 株式会社ジェイテクト | 転がり軸受 |
-
2020
- 2020-10-05 DE DE102020125963.8A patent/DE102020125963A1/de not_active Ceased
-
2021
- 2021-07-05 EP EP21743037.0A patent/EP4226058A1/de not_active Withdrawn
- 2021-07-05 CN CN202180068177.3A patent/CN116261631A/zh active Pending
- 2021-07-05 KR KR1020237007996A patent/KR20230045081A/ko not_active Withdrawn
- 2021-07-05 WO PCT/DE2021/100581 patent/WO2022073532A1/de not_active Ceased
- 2021-07-05 US US18/245,503 patent/US20240026928A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| US20240026928A1 (en) | 2024-01-25 |
| WO2022073532A1 (de) | 2022-04-14 |
| CN116261631A (zh) | 2023-06-13 |
| DE102020125963A1 (de) | 2022-04-07 |
| KR20230045081A (ko) | 2023-04-04 |
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