EP4695531A1 - Rolling bearing with a first and a second amount of grease - Google Patents

Rolling bearing with a first and a second amount of grease

Info

Publication number
EP4695531A1
EP4695531A1 EP23719724.9A EP23719724A EP4695531A1 EP 4695531 A1 EP4695531 A1 EP 4695531A1 EP 23719724 A EP23719724 A EP 23719724A EP 4695531 A1 EP4695531 A1 EP 4695531A1
Authority
EP
European Patent Office
Prior art keywords
grease
amount
sealing
rolling bearing
ring
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.)
Pending
Application number
EP23719724.9A
Other languages
German (de)
French (fr)
Inventor
Nicola De Laurentis
Cornelis Harm TAAL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SKF AB
Original Assignee
SKF AB
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 SKF AB filed Critical SKF AB
Publication of EP4695531A1 publication Critical patent/EP4695531A1/en
Pending legal-status Critical Current

Links

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
    • F16C33/7896—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
    • 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
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
    • F16C33/6607—Retaining the grease in or near the bearing
    • 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
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
    • F16C33/6633—Grease properties or compositions, e.g. rheological properties
    • 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
    • F16C33/7889—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to an inner race and extending toward the outer race
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
    • C10M2207/1256—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids used as thickening agent
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/02—Groups 1 or 11
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/02—Bearings
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/10—Form in which the lubricant is applied to the material being lubricated semi-solid; greasy
    • 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
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
    • F16C33/6629—Details of distribution or circulation inside the bearing, e.g. grooves on the cage or passages in the rolling elements
    • 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

Definitions

  • the invention concerns a rolling bearing, which is lubricated with grease.
  • One of the factors which can have an influence on the service life of a rolling bearing is the service life of the grease. It is known that oxidation reduces the service life of grease.
  • the amount of antioxidants in grease can be increased to make grease more resistant to oxidation.
  • the amount of antioxidants in grease is limited because of different reasons, including the need to keep sufficient lubricity and consistency of grease.
  • costs can also be a limiting factor since antioxidants are relatively expensive.
  • Grease formulated with different thickener types and oil types with inherent, better antioxidant properties can also be considered as an option. However, these are often significantly more expensive, and not always the ideal choice for the specific application: For example, they may be more resistant to oxidation, but unable to provide the required lubricity for the application conditions.
  • the problem of the invention is in particular to provide a possibility for a high grease service life of a rolling bearing in a cost-efficient manner.
  • the problem is solved according to the invention by the features of claim 1 , while advantageous embodiments and further embodiments of the invention can be taken from the subclaims.
  • a rolling bearing with a first ring and at least a second ring, which are intended to rotate relative to each other during an operating process, with rolling elements, which are arranged between the rings, with a first intermediate space between the first ring and the second ring, which is positioned at a first side of the rolling elements, with a first sealing, which is also positioned at the first side of the rolling elements and which seals the first intermediate space against intrusion of dirt from a space outside the rolling bearing, with a second sealing, which is positioned at the first side of the rolling elements and between the first sealing and the rolling elements, with a first amount of grease, which is intended to lubricate a movement of the rolling elements relative to the rings, and with a second amount of grease, which is at least positioned between the first sealing and the second sealing, wherein the second amount of grease has a different composition than the first amount of grease.
  • the second amount of grease which is less than the first amount of grease, can be equipped in a manner which protects the first amount of grease from oxidation in a cost-efficient way.
  • a substance can be used which is less expensive than for a rolling bearing, in which the second amount of grease is not provided.
  • the first side of the rolling elements can in particular be an axial side of the rolling elements.
  • an axial side of the rolling elements it is to be understood in particular a surface of the rolling elements, which is seen when somebody looks in an axial direction of the rolling bearing on the rolling bearing, whereat all sealings of the rolling bearing are disassembled from the rolling bearing.
  • the rolling bearing is in a new and/or unused condition.
  • the second amount of grease comprises a base oil from group 3 or group 4 or group 5 of the base oil classification of the American Petroleum Institute. Through this a good resistance against oxidation of the second amount of grease can be achieved.
  • a thickener of the second amount of grease is preferably a nonsoap thickener.
  • the thickener of the second amount of grease can be polyurea. Through this the thickener has good antioxidative properties.
  • the total amount of additives, which are contained in the second amount of grease consists in large part of antioxidants.
  • “In large part” should in particular mean at least 50 weight percent, preferably at least 75 weight percent and more preferably at least 95 weight percent. In this way an effective protection of the first amount of grease from oxidation can be reached.
  • the amount of antioxidants contained in the second amount of grease is no less than 0.5 weight percent and maximally 5 weight percent. Thereby a good antioxidative effect of the second amount of grease can be achieved.
  • antioxidant types of the second amount of grease can be octylated diphenylamine and/or butylated diphenylamine and/or alkylated phenyl alpha naphthylamine.
  • a base oil of the second amount of grease is ester oil. Through this a good resistance against oxidation can be achieved.
  • a base oil of the second amount of grease is ester oil. Through this a good resistance against oxidation can be achieved.
  • NLGI is an abbreviation of National Lubricating Grease Institute. Through this a good resistance against flow of the second amount of grease can be reached.
  • the complete amount of grease, which is located between the first sealing and the second sealing is less than 15 weight percent of the first amount of grease, wherein the first amount of grease is the complete amount of grease of the rolling bearing, which is intended to lubricate a movement of the rolling elements relative to the rings.
  • the complete amount of grease, which is located between the first sealing and the second sealing less than 8 weight percent and more preferably less than six weight percent of the first amount of grease, whereby a protection of the first amount of grease from oxidation is still good and very cost-efficient.
  • the second amount of grease extends essentially in a continuous way from the first ring to the second ring , in particular on the whole circumference of the first ring.
  • a part of the second amount of grease seals a gap between the first sealing and the first ring and/or a part of the second amount of grease seals a gap between the second sealing and the second ring.
  • the fist ring can be an inner ring and the second ring can be an outer ring.
  • a thickener of the first amount of grease is lithium or a lithium complex. Thereby a good lubricity can be reached.
  • a base oil of the first amount of grease is mineral oil. In this way costs can be saved.
  • Fig. 1 shows a schematic axial section through a bearing according to the invention.
  • Figure 1 shows a half cross section through a rolling bearing according to the invention.
  • the rolling bearing is a deep groove ball bearing with rolling elements 14 and a cage 15, which are located between a first ring 10 of the rolling bearing and a second ring 12 of the rolling bearing.
  • the two rings 10, 12 are intended to rotate relative to each other during an operating process.
  • the rolling bearing comprises a first intermediate space 16 between the first ring 10 and the second ring 12, which is positioned at a first axial side 20 of the rolling elements.
  • a first sealing 18 of the rolling bearing seals the first intermediate space 16 against intrusion of contaminants from a space 22 outside of the rolling bearing and is also located at the first side 20 of the rolling elements 14.
  • a second sealing 24 is positioned at the first side 20 of the rolling elements and between the first sealing 18 and the rolling elements 14.
  • a first amount of grease 26 is the complete amount of grease of the rolling bearing, which is intended for lubricating a movement of the rolling elements 14 relative to the rings 10, 12.
  • the first amount of grease is located in a vicinity of the rolling elements 14.
  • the rolling bearing comprises a second amount of grease 28, which is amongst others positioned between the first sealing 18 and the second sealing 24 and which has a different composition than the first amount of grease 26.
  • the second amount of grease 28 comprises a base oil from group 3 or group 4 or group 5 of the base oil classification of the American Petroleum Institute. More specifically, the base oil of the second amount of grease can for example be ester oil.
  • a thickener of the second amount of grease 28 is a non-soap thickener.
  • the thickener of the second amount of grease 28 can for example be polyurea.
  • the total amount of additives, which are contained in the second amount of grease 28, consists in large part of antioxidants. In particular are all the additives of the second amount of grease 28 antioxidants.
  • the second amount of grease 28 has a NLGI consistency number in a range from 1 to 3.
  • a thickener of the first amount of grease 26 is lithium or a lithium complex.
  • a base oil of the first amount of grease 26 is mineral oil.
  • Additives of the first amount of grease 26 can be friction modifiers extreme pressure additives anti-wear additives, rust inhibitors, corrosion inhibitors and antioxidants.
  • a difference of the first amount of grease 26 to a grease, which is normally used for lubricating the movement in rolling bearings, can be the smaller amount of antioxidants, because most of the protection of the first amount of grease 26 against oxidation is done by the second amount of grease 28.
  • a part of the second amount of grease 28 seals a gap 30 between the first sealing 18 and the first ring 10 (not shown).
  • a part of the second amount of grease 28 seals a gap 32 between the second sealing 24 and the second ring 12 (not shown).
  • the second amount of grease 28 extends essentially in a continuous way from the first ring 10 to the second ring 12 along the whole circumference of the first ring. There can be a certain number of small holes leading from the space 22 outside of the rolling bearing to the first amount of grease 26.
  • the second amount of grease 28 provides in total a very good protection for the first amount of grease 26 against oxidation through oxygen which comes from the space 22 outside of the rolling bearing. This protection is performed by the antioxidant effect of the second amount of grease 28 and also by the sealing effect of the second amount of grease 28.
  • the complete amount of grease, which is located between the first sealing 18 and the second sealing 24, is less than 15 weight percent of the first amount of grease 26. Furthermore, the second amount of grease 28 is less than 15 weight percent of the first amount of grease 26.
  • the sealing 18 is located at a first axial end of the rolling bearing.
  • the second axial end of the rolling bearing, which is located opposed to the first axial end is sealed in the same way as the first axial end.
  • a sealing 34 has the same function as the sealing 18.
  • a third amount of grease 38 has the same function as the second amount of grease 28.
  • a sealing 38 has the same function as the sealing 24.
  • All the sealings of the rolling bearing can be made from metal and in particular steel. In this case each of the sealings is called shield.
  • the second amount of grease 28 is positioned on the sealing 24 (not shown).
  • the inner ring 10 rotates and the outer ring 12 does not move.
  • the sealing 24 is fixed to the ring 10 and moves with it.
  • the sealing 18 is fixed to the outer ring 12.
  • the space between the sealing 24 and the sealing 36 is filled with the first amount of grease 26.
  • the space between the sealing 24 and the sealing 18 is much smaller than the space between the sealing 36 and the sealing 24.
  • the second amount of grease 28 is much more resistant to oxidation than the first amount of grease 26. Therefore the second amount of grease 28 might be a more expensive type of grease then grease of the first amount of grease 26.
  • the two sealings 18, 24 and the second amount of grease operate as a more effective type of sealant compared to single sealings and single Shields to protect from oxidation and external contamination.
  • the lubricating grease seals part of the gaps present between the inside of the bearing and the environment, next to the shields.
  • the second amount of grease 28 With additional external shields and the second amount of grease 28 proposed, the second amount of grease seals (most of) the additional gaps between the internal and external shields, resulting in a better isolation from the environment. So, in general, with the proposed solution, better sealing of the bearing is provided.
  • the second amount of grease creates a barrier against oxidation due to its good antioxidant properties.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

Proposed is a rolling bearing with a first ring (10) and at least a second ring (12), which are intended to rotate relative to each other during an operating process, with rolling elements (14), which are arranged between the rings (10, 12), with a first intermediate space (16) between the first ring (10) and the second ring (12), which is positioned at a first side (20) of the rolling elements, with a first sealing (18), which is also positioned at the first side (20) of the rolling elements and which seals the first intermediate space (16) against intrusion of dirt from a space (22) outside the rolling bearing, with a second sealing (24), which is positioned at the first side of the rolling elements and between the first sealing (18) and the rolling elements (14), with a first amount of grease (26), which is intended to lubricate a movement of the rolling elements relative to the rings, and with a second amount of grease (28), which is at least positioned between the first sealing (18) and the second sealing (24), wherein the second amount of grease (28) has a different composition than the first amount of grease.

Description

Rolling bearing with a first and a second amount of grease
The invention concerns a rolling bearing, which is lubricated with grease.
One of the factors which can have an influence on the service life of a rolling bearing is the service life of the grease. It is known that oxidation reduces the service life of grease. The amount of antioxidants in grease can be increased to make grease more resistant to oxidation. However, the amount of antioxidants in grease is limited because of different reasons, including the need to keep sufficient lubricity and consistency of grease. Furthermore, costs can also be a limiting factor since antioxidants are relatively expensive. Grease formulated with different thickener types and oil types with inherent, better antioxidant properties can also be considered as an option. However, these are often significantly more expensive, and not always the ideal choice for the specific application: For example, they may be more resistant to oxidation, but unable to provide the required lubricity for the application conditions.
The problem of the invention is in particular to provide a possibility for a high grease service life of a rolling bearing in a cost-efficient manner. The problem is solved according to the invention by the features of claim 1 , while advantageous embodiments and further embodiments of the invention can be taken from the subclaims.
Proposed is a rolling bearing with a first ring and at least a second ring, which are intended to rotate relative to each other during an operating process, with rolling elements, which are arranged between the rings, with a first intermediate space between the first ring and the second ring, which is positioned at a first side of the rolling elements, with a first sealing, which is also positioned at the first side of the rolling elements and which seals the first intermediate space against intrusion of dirt from a space outside the rolling bearing, with a second sealing, which is positioned at the first side of the rolling elements and between the first sealing and the rolling elements, with a first amount of grease, which is intended to lubricate a movement of the rolling elements relative to the rings, and with a second amount of grease, which is at least positioned between the first sealing and the second sealing, wherein the second amount of grease has a different composition than the first amount of grease. Thereby a possibility for a long grease service life of a rolling bearing in a cost-efficient manner is provided. In particular the second amount of grease, which is less than the first amount of grease, can be equipped in a manner which protects the first amount of grease from oxidation in a cost-efficient way. In particular for the first amount of grease a substance can be used which is less expensive than for a rolling bearing, in which the second amount of grease is not provided.
The first side of the rolling elements can in particular be an axial side of the rolling elements. By an axial side of the rolling elements it is to be understood in particular a surface of the rolling elements, which is seen when somebody looks in an axial direction of the rolling bearing on the rolling bearing, whereat all sealings of the rolling bearing are disassembled from the rolling bearing.
In particular the rolling bearing is in a new and/or unused condition.
With advantage the second amount of grease comprises a base oil from group 3 or group 4 or group 5 of the base oil classification of the American Petroleum Institute. Through this a good resistance against oxidation of the second amount of grease can be achieved.
Furthermore, it is suggested that a thickener of the second amount of grease is preferably a nonsoap thickener. Thereby a good oxidative stability can be achieved. In particular the thickener of the second amount of grease can be polyurea. Through this the thickener has good antioxidative properties.
Advantageously the total amount of additives, which are contained in the second amount of grease, consists in large part of antioxidants. “In large part” should in particular mean at least 50 weight percent, preferably at least 75 weight percent and more preferably at least 95 weight percent. In this way an effective protection of the first amount of grease from oxidation can be reached.
Furthermore, it is suggested that the amount of antioxidants contained in the second amount of grease is no less than 0.5 weight percent and maximally 5 weight percent. Thereby a good antioxidative effect of the second amount of grease can be achieved. In particular, antioxidant types of the second amount of grease can be octylated diphenylamine and/or butylated diphenylamine and/or alkylated phenyl alpha naphthylamine.
Furthermore, it is suggested that a base oil of the second amount of grease is ester oil. Through this a good resistance against oxidation can be achieved. With advantage has the second amount of grease a NLGI consistency number in a range from 1 to 3. “NLGI” is an abbreviation of National Lubricating Grease Institute. Through this a good resistance against flow of the second amount of grease can be reached.
Moreover, it is suggested that the complete amount of grease, which is located between the first sealing and the second sealing, is less than 15 weight percent of the first amount of grease, wherein the first amount of grease is the complete amount of grease of the rolling bearing, which is intended to lubricate a movement of the rolling elements relative to the rings. Through this a cost-efficient protection of the first amount of grease from oxidation can be achieved. Preferably is the complete amount of grease, which is located between the first sealing and the second sealing less than 8 weight percent and more preferably less than six weight percent of the first amount of grease, whereby a protection of the first amount of grease from oxidation is still good and very cost-efficient.
In particular is the first amount of grease all the grease of the rolling bearing, which is intended for lubricating a movement of the rolling elements relative to the rings.
Furthermore, it is suggested that the second amount of grease extends essentially in a continuous way from the first ring to the second ring , in particular on the whole circumference of the first ring. Thereby a very effective protection of the first amount of grease from oxidation and an effective sealing of a space around the rolling elements from dust, water and contaminants in general from outside of the rolling bearing can be reached.
Advantageously a part of the second amount of grease seals a gap between the first sealing and the first ring and/or a part of the second amount of grease seals a gap between the second sealing and the second ring. Through this a good sealing of a space around the rolling elements from dust from outside of the rolling bearing can be achieved.
In particular, the fist ring can be an inner ring and the second ring can be an outer ring.
Moreover, it is suggested that a thickener of the first amount of grease is lithium or a lithium complex. Thereby a good lubricity can be reached.
Furthermore, it is suggested that a base oil of the first amount of grease is mineral oil. In this way costs can be saved.
Further advantages can be seen in the following description of the drawings. An example of an embodiment of the invention is shown in the drawings. The drawings, the description and the claims contain numerous features in combination. The skilled person will expediently also consider the features individually and combine them to form useful further combinations.
Fig. 1 shows a schematic axial section through a bearing according to the invention.
Figure 1 shows a half cross section through a rolling bearing according to the invention. The rolling bearing is a deep groove ball bearing with rolling elements 14 and a cage 15, which are located between a first ring 10 of the rolling bearing and a second ring 12 of the rolling bearing. The two rings 10, 12 are intended to rotate relative to each other during an operating process. Moreover, the rolling bearing comprises a first intermediate space 16 between the first ring 10 and the second ring 12, which is positioned at a first axial side 20 of the rolling elements. A first sealing 18 of the rolling bearing seals the first intermediate space 16 against intrusion of contaminants from a space 22 outside of the rolling bearing and is also located at the first side 20 of the rolling elements 14. A second sealing 24 is positioned at the first side 20 of the rolling elements and between the first sealing 18 and the rolling elements 14.
A first amount of grease 26 is the complete amount of grease of the rolling bearing, which is intended for lubricating a movement of the rolling elements 14 relative to the rings 10, 12. The first amount of grease is located in a vicinity of the rolling elements 14. Furthermore, the rolling bearing comprises a second amount of grease 28, which is amongst others positioned between the first sealing 18 and the second sealing 24 and which has a different composition than the first amount of grease 26. The second amount of grease 28 comprises a base oil from group 3 or group 4 or group 5 of the base oil classification of the American Petroleum Institute. More specifically, the base oil of the second amount of grease can for example be ester oil. Furthermore, a thickener of the second amount of grease 28 is a non-soap thickener. More specifically, the thickener of the second amount of grease 28 can for example be polyurea. The total amount of additives, which are contained in the second amount of grease 28, consists in large part of antioxidants. In particular are all the additives of the second amount of grease 28 antioxidants. Moreover, the second amount of grease 28 has a NLGI consistency number in a range from 1 to 3.
A thickener of the first amount of grease 26 is lithium or a lithium complex. A base oil of the first amount of grease 26 is mineral oil. Additives of the first amount of grease 26 can be friction modifiers extreme pressure additives anti-wear additives, rust inhibitors, corrosion inhibitors and antioxidants. A difference of the first amount of grease 26 to a grease, which is normally used for lubricating the movement in rolling bearings, can be the smaller amount of antioxidants, because most of the protection of the first amount of grease 26 against oxidation is done by the second amount of grease 28.
A part of the second amount of grease 28 seals a gap 30 between the first sealing 18 and the first ring 10 (not shown). A part of the second amount of grease 28 seals a gap 32 between the second sealing 24 and the second ring 12 (not shown). The second amount of grease 28 extends essentially in a continuous way from the first ring 10 to the second ring 12 along the whole circumference of the first ring. There can be a certain number of small holes leading from the space 22 outside of the rolling bearing to the first amount of grease 26. The second amount of grease 28 provides in total a very good protection for the first amount of grease 26 against oxidation through oxygen which comes from the space 22 outside of the rolling bearing. This protection is performed by the antioxidant effect of the second amount of grease 28 and also by the sealing effect of the second amount of grease 28.
The complete amount of grease, which is located between the first sealing 18 and the second sealing 24, is less than 15 weight percent of the first amount of grease 26. Furthermore, the second amount of grease 28 is less than 15 weight percent of the first amount of grease 26.
The sealing 18 is located at a first axial end of the rolling bearing. The second axial end of the rolling bearing, which is located opposed to the first axial end is sealed in the same way as the first axial end. A sealing 34 has the same function as the sealing 18. A third amount of grease 38 has the same function as the second amount of grease 28. A sealing 38 has the same function as the sealing 24.
All the sealings of the rolling bearing can be made from metal and in particular steel. In this case each of the sealings is called shield.
The second amount of grease 28 is positioned on the sealing 24 (not shown).
In a condition, in which the rolling bearing is part of an application, the inner ring 10 rotates and the outer ring 12 does not move. The sealing 24 is fixed to the ring 10 and moves with it. The sealing 18 is fixed to the outer ring 12. The space between the sealing 24 and the sealing 36 is filled with the first amount of grease 26. The space between the sealing 24 and the sealing 18 is much smaller than the space between the sealing 36 and the sealing 24. The second amount of grease 28 is much more resistant to oxidation than the first amount of grease 26. Therefore the second amount of grease 28 might be a more expensive type of grease then grease of the first amount of grease 26. The two sealings 18, 24 and the second amount of grease operate as a more effective type of sealant compared to single sealings and single Shields to protect from oxidation and external contamination.
In traditional rolling bearings with traditional single shields, the lubricating grease seals part of the gaps present between the inside of the bearing and the environment, next to the shields. With additional external shields and the second amount of grease 28 proposed, the second amount of grease seals (most of) the additional gaps between the internal and external shields, resulting in a better isolation from the environment. So, in general, with the proposed solution, better sealing of the bearing is provided. Moreover, the second amount of grease creates a barrier against oxidation due to its good antioxidant properties.
With the proposed solution, life of the grease 26 is extended, resulting in longer bearing life. Contamination-based failure modes will also be less probable due to better sealing. The need for the first amount of grease 26 being resistant to oxidation is reduced in particular because of the second amount of grease 28. Therefore, the first amount of grease 26 can be a cheaper grease.
List of reference numerals:

Claims

Claims:
1 . Rolling bearing with a first ring (10) and at least a second ring (12), which are intended to rotate relative to each other during an operating process, with rolling elements (14), which are arranged between the rings (10, 12), with a first intermediate space (16) between the first ring (10) and the second ring (12), which is positioned at a first side (20) of the rolling elements, with a first sealing (18), which is also positioned at the first side (20) of the rolling elements and which seals the first intermediate space (16) against intrusion of dirt from a space (22) outside the rolling bearing, with a second sealing (24), which is positioned at the first side of the rolling elements and between the first sealing (18) and the rolling elements (14), with a first amount of grease (26), which is intended to lubricate a movement of the rolling elements relative to the rings, and with a second amount of grease (28), which is at least positioned between the first sealing (18) and the second sealing (24), wherein the second amount of grease (28) has a different composition than the first amount of grease.
2. Rolling bearing according to claim 1 , characterized in that the second amount of grease (28) comprises a base oil from group 3 or group 4 or group 5 of the base oil classification of the American Petroleum Institute.
3. Rolling bearing at least according to claim 1 or claim 2, characterized in that a thickener of the second amount of grease (28) is a non-soap thickener.
4. Rolling bearing at least according to one of the claims 1 to 3, characterized in that the total amount of additives, which are contained in the second amount of grease (28), consists in large part of antioxidants.
5. Rolling bearing at least according to one of the claims 1 to 4, characterized in that a thickener of the second amount of grease (28) is polyurea and/or a base oil of the second amount of grease is ester oil.
6. Rolling bearing at least according to one of the claims 1 to 5, characterized in that the second amount of grease (28) has a NLGI consistency number in a range from 1 to 3.
7. Rolling bearing at least according to one of the claims 1 to 6, characterized in that the complete amount of grease, which is located between the first sealing (18) and the second sealing (24), is less than 15 weight percent of the first amount of grease (26), wherein the first amount of grease is the complete amount of grease of the rolling bearing, which is intended to lubricate a movement of the rolling elements relative to the rings (10,12).
8. Rolling bearing at least according to one of the claims 1 to 7, characterized in that the second amount of grease (28) extends essentially in a continuous way from the first ring (10) to the second ring (12).
9. Rolling bearing at least according to one of the claims 1 to 8, characterized in that a part of the second amount of grease (28) seals a gap (30) between the first sealing
(18) and the first ring (10) and/or a part of the second amount of grease (28) seals a gap (32) between the second sealing (24) and the second ring (12).
10. Rolling bearing at least according to one of the claims 1 to 9, characterized in that a thickener of the first amount of grease (26) is lithium or a lithium complex and/or a base oil of the first amount of grease (26) is mineral oil.
EP23719724.9A 2023-04-13 2023-04-13 Rolling bearing with a first and a second amount of grease Pending EP4695531A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2023/059698 WO2024213255A1 (en) 2023-04-13 2023-04-13 Rolling bearing with a first and a second amount of grease

Publications (1)

Publication Number Publication Date
EP4695531A1 true EP4695531A1 (en) 2026-02-18

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Application Number Title Priority Date Filing Date
EP23719724.9A Pending EP4695531A1 (en) 2023-04-13 2023-04-13 Rolling bearing with a first and a second amount of grease

Country Status (3)

Country Link
EP (1) EP4695531A1 (en)
CN (1) CN120958251A (en)
WO (1) WO2024213255A1 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62278315A (en) * 1986-05-24 1987-12-03 Koyo Seiko Co Ltd Bearing device
WO2006078035A1 (en) * 2005-01-24 2006-07-27 Nsk Ltd. Rolling bearing, grease composition for hub unit bearing, and hub unit bearing for vehicles
SG11201401410YA (en) * 2011-11-08 2014-06-27 Exxonmobil Res & Eng Co Water resistant grease composition

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CN120958251A (en) 2025-11-14

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