WO1999035414A1 - Rolling element bearing having a cooling cage - Google Patents

Rolling element bearing having a cooling cage Download PDF

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Publication number
WO1999035414A1
WO1999035414A1 PCT/NL1999/000012 NL9900012W WO9935414A1 WO 1999035414 A1 WO1999035414 A1 WO 1999035414A1 NL 9900012 W NL9900012 W NL 9900012W WO 9935414 A1 WO9935414 A1 WO 9935414A1
Authority
WO
WIPO (PCT)
Prior art keywords
cage
rolling element
cooling
element bearing
bearing according
Prior art date
Application number
PCT/NL1999/000012
Other languages
French (fr)
Inventor
Bo Olov Jacobson
Eustatios Ioannides
Original Assignee
Skf Engineering & Research Centre B.V.
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 Engineering & Research Centre B.V. filed Critical Skf Engineering & Research Centre B.V.
Priority to AU21898/99A priority Critical patent/AU2189899A/en
Priority to JP2000527767A priority patent/JP2002500329A/en
Priority to EP99901995A priority patent/EP1044337A1/en
Publication of WO1999035414A1 publication Critical patent/WO1999035414A1/en

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
    • F16C37/00—Cooling of bearings
    • F16C37/007—Cooling of bearings 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
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/38—Ball cages
    • F16C33/3837—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages
    • F16C33/3843—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages
    • 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
    • F16C33/46—Cages for rollers or needles
    • F16C33/4617—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages
    • F16C33/4623—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages
    • 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
    • F16C33/6614—Retaining the grease in or near the bearing in recesses or cavities provided in retainers, races or 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
    • 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
    • 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
    • F16C19/24—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 radial load mainly
    • F16C19/26—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 radial load mainly with a single row of rollers

Definitions

  • Rolling element bearing having a cooling cage
  • the invention is related to a rolling element bearing comprising an outer ring and an inner ring each with a raceway, said rings enclosing a series of rolling elements which are in rolling contact with the raceways, and a cage having cage bars between which pockets are defined for accommodating a rolling element each.
  • rolling element bearings for instance a spherical roller bearing, are widely known.
  • Rolling element bearing are generally provided with a lubricant such as a grease. During service, the oil bleeds from the grease and is finally depleted. Thus, after a certain service period, the bearing should be relubricated.
  • the maximum time allowable between relubrication of the bearing constitutes an important property.
  • the maximum time interval for relubrication appears to be too small. Said interval does not only depend on the running conditions of the bearing and the bearing design, but also on the amount of grease which can be maintained in place on the cage bars, that is close to the surface of the rolling elements.
  • the temperature for the cage is determinant for the amount of grease which can be retained, and also for the bleeding rate of the grease.
  • this temperature is decisive for the length of the time period during which a proper lubrication of the bearing can be maintained. As an example, a doubling of this time period is obtained for every 10 - 15 °C temperature drop of the cage.
  • the cage of a spherical roller bearing may reach an overtemperature of 30 - 70 °C.
  • Such relative high temperature thus shortens the maximum lubrication time interval appreciably.
  • the object of the invention is therefore to provide a bearing which has a better lubrication time interval. This object is achieved in that the cage has cooling means for preventing grease or lubricant leaving the cage as a result of an increase in temperature.
  • the cooling means are for cooling the cage bar.
  • the cooling means prevent the temperature of the cage to rise in service, whereby the cage bars are able to hold the grease in a proper position for lubricating the rolling elements.
  • the cooling means may have areas of the cage having enlarged surfaces, which enlarged surfaces are bounding the bearing space, or are outside the bearing space. Such surfaces can be cooled by the outside atmosphere of the bearing, in particular during rotation of the cage.
  • the cage has cooling elements having an external cooling surface facing towards the outside of the bearing space.
  • the cooling elements fit between the outer ring and inner ring.
  • the cooling elements overlap one of the rings on the outside. In case the cooling elements are perforated, an increased cooling effect may be obtained as a result of the turbulent flow thus generated.
  • the cooling elements may comprise a ring or disc fastened on the cage or a ring or disc which is integrally formed with the cage.
  • Figure 1 shows a radial cross-section through a first embodiment of the bearing according to the invention.
  • Figure 2 shows a cross-section through a second embodiment.
  • Figure 3 shows a sideview of the bearing according to figure 1.
  • Figure 4 shows a sideview of the bearing according to figure 2.
  • Figure 5 shows a further embodiment.
  • the bearing shown in figure 1 has an outer ring 1, an inner ring 2, and a series of balls 3.
  • the series of balls 3 is contained in a cage 4.
  • Said cage has cage pockets 5, onto which extensions 6 are connected each carrying a cooling element 7 or a (continuous) cooling disc.
  • the cage pockets are each defined between a pair of cage bars 8.
  • the cooling elements 7 have the cooling effect on the cage bars 8.
  • the grease which collects on the cage bars 8, is thereby cooled as well, thus providing a better retaining capability for the grease on the cage bars 8.
  • a controlled release of the lubricant contained in the grease is now ensured for longer periods, leading to longer lubrication interval times.
  • FIG. 2 shows a roller bearing having an outer race 9, an inner race 10, rollers 11 and a cage 12.
  • the cage 12 has cage pockets 13, defined between a pair of cage bars 14 each.
  • Cage bars 14 are directly connected to cooling elements 15, whereby also a cooling effect for the cage bars 14 is ensured.
  • Figure 5 shows an embodiment wherein a ring 16 is connected to the cage (not visible). This configuration has the advantage that more grease can be held in the vicinity of the rolling elements resulting in improved lubrication.

Landscapes

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

Abstract

A rolling element bearing comprises an outer ring (1) and an inner ring (2) each with a raceway, said rings enclosing a series of rolling elements (3) which are in rolling contact with the raceways, and a cage (4) having cage bars (8) between which pockets are defined for accommodating a rolling element (3) each. The cage (4) has cooling means (7) for preventing grease or lubricant leaving the cage as a result of an increase in temperature.

Description

Rolling element bearing having a cooling cage
The invention is related to a rolling element bearing comprising an outer ring and an inner ring each with a raceway, said rings enclosing a series of rolling elements which are in rolling contact with the raceways, and a cage having cage bars between which pockets are defined for accommodating a rolling element each. Such rolling element bearings, for instance a spherical roller bearing, are widely known. Rolling element bearing are generally provided with a lubricant such as a grease. During service, the oil bleeds from the grease and is finally depleted. Thus, after a certain service period, the bearing should be relubricated.
The maximum time allowable between relubrication of the bearing constitutes an important property. In particular, for spherical roller bearings, the maximum time interval for relubrication appears to be too small. Said interval does not only depend on the running conditions of the bearing and the bearing design, but also on the amount of grease which can be maintained in place on the cage bars, that is close to the surface of the rolling elements.
In this respect, it appears that the temperature for the cage is determinant for the amount of grease which can be retained, and also for the bleeding rate of the grease. As a consequence, this temperature is decisive for the length of the time period during which a proper lubrication of the bearing can be maintained. As an example, a doubling of this time period is obtained for every 10 - 15 °C temperature drop of the cage. In service, the cage of a spherical roller bearing may reach an overtemperature of 30 - 70 °C. Such relative high temperature thus shortens the maximum lubrication time interval appreciably. The object of the invention is therefore to provide a bearing which has a better lubrication time interval. This object is achieved in that the cage has cooling means for preventing grease or lubricant leaving the cage as a result of an increase in temperature.
In particular, the cooling means are for cooling the cage bar. The cooling means prevent the temperature of the cage to rise in service, whereby the cage bars are able to hold the grease in a proper position for lubricating the rolling elements. The cooling means may have areas of the cage having enlarged surfaces, which enlarged surfaces are bounding the bearing space, or are outside the bearing space. Such surfaces can be cooled by the outside atmosphere of the bearing, in particular during rotation of the cage. Preferably, the cage has cooling elements having an external cooling surface facing towards the outside of the bearing space.
According to a first possibility, the cooling elements fit between the outer ring and inner ring. However, according to a second possibility, the cooling elements overlap one of the rings on the outside. In case the cooling elements are perforated, an increased cooling effect may be obtained as a result of the turbulent flow thus generated.
The cooling elements may comprise a ring or disc fastened on the cage or a ring or disc which is integrally formed with the cage.
The invention will further be described with reference to the embodiments shown in the figures.
Figure 1 shows a radial cross-section through a first embodiment of the bearing according to the invention.
Figure 2 shows a cross-section through a second embodiment. Figure 3 shows a sideview of the bearing according to figure 1. Figure 4 shows a sideview of the bearing according to figure 2.
Figure 5 shows a further embodiment.
The bearing shown in figure 1 has an outer ring 1, an inner ring 2, and a series of balls 3. The series of balls 3 is contained in a cage 4. Said cage has cage pockets 5, onto which extensions 6 are connected each carrying a cooling element 7 or a (continuous) cooling disc.
The cage pockets are each defined between a pair of cage bars 8. Thus, the cooling elements 7 have the cooling effect on the cage bars 8. The grease which collects on the cage bars 8, is thereby cooled as well, thus providing a better retaining capability for the grease on the cage bars 8. A controlled release of the lubricant contained in the grease is now ensured for longer periods, leading to longer lubrication interval times.
The embodiment of figure 2 shows a roller bearing having an outer race 9, an inner race 10, rollers 11 and a cage 12. The cage 12 has cage pockets 13, defined between a pair of cage bars 14 each. Cage bars 14 are directly connected to cooling elements 15, whereby also a cooling effect for the cage bars 14 is ensured.
Figure 5 shows an embodiment wherein a ring 16 is connected to the cage (not visible). This configuration has the advantage that more grease can be held in the vicinity of the rolling elements resulting in improved lubrication.

Claims

Claims
1. Rolling element bearing, comprising an outer ring (1, 9) and an inner ring (2, 10) each with a raceway, said rings enclosing a series of rolling elements (3, 11) which are in rolling contact with the raceways, and a cage (4, 12) having at least one cage ring and cage bars (8, 14), between which cage bars (8, 14) pockets (5, 13) are defined for accommodating a rolling element (3, 11) each, characterized in that the cage has cooling means (7, 15) for preventing an increase in temperature.
2. Rolling element bearing according to claim 1, wherein the cooling means are for preventing an increase in temperature of a grease or lubricant.
3. Rolling element bearing according to claim 1 or 2, wherein the cooling means (4, 12) are for cooling at least one cage bar (8, 14).
4. Rolling element bearing according to any of the preceding claims, wherein the cooling means (7, 15) comprise areas of the cage (4, 12) having enlarged surfaces which enlarged surfaces are bounding the bearing space.
5. Rolling element bearing according to according to any of the preceding claims, wherein the cooling means (7, 15) comprise areas of the cage (4, 12) having enlarged surfaces which enlarged surfaces are outside the bearing space.
6. Rolling element bearing according to any of the preceding claims, wherein the cage (4, 12) has cooling elements (7, 15) having an external cooling surface facing towards the outside of the bearing space.
7. Rolling element bearing according to claim 6, wherein the cooling elements (7) fit between the outer ring (1) and inner ring (2).
8. Rolling element bearing according to claim 6 or 7, wherein the cooling elements (15) overlap one of the rings (9) on the outside.
9. Rolling element bearing according to any of claims 6-8, wherein the cooling elements act as shields which at last partly close off the bearing space defined between the rings (1, 2, 9, 10).
10. Rolling element bearing according to any of claims 6-9, wherein the cooling elements (7, 15) are perforated for creating a turbulent cooling flow.
11. Rolling element bearing according to any of the preceding claims, wherein the cooling elements comprise a ring or disc fastened on the cage.
12. Rolling element bearing according to any of the preceding claims wherein the cooling elements comprise a ring or disc which is integrally formed with the cage.
13. Rolling element bearing according to any of the preceding claims, wherein the cooling means (7, 15) extend radially inside and/or outside with respect to a cage ring.
14. Rolling element bearing according to any of the preceding claims, wherein the cooling means (7, 15) extend axially outside with respect to a cage ring.
15. In a rolling element bearing, comprising an outer ring (1, 9) and an inner ring (2, 10) each with a raceway, said rings enclosing a series of rolling elements (3, 11) which are in rolling contact with the raceways, and a cage (4, 12) having at least one cage ring and cage bars (8, 14), between which cage bars (8, 14) pockets (5, 13) are defined for accommodating a rolling element (3, 11) each, use of cooling means for cooling the cage so as to prevent grease or lubricant leaving the cage as a result of an increase of temperature during service of said bearing.
PCT/NL1999/000012 1998-01-09 1999-01-11 Rolling element bearing having a cooling cage WO1999035414A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU21898/99A AU2189899A (en) 1998-01-09 1999-01-11 Rolling element bearing having a cooling cage
JP2000527767A JP2002500329A (en) 1998-01-09 1999-01-11 Rolling element bearing with cooling cage
EP99901995A EP1044337A1 (en) 1998-01-09 1999-01-11 Rolling element bearing having a cooling cage

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9800018 1998-01-09
NLPCT/NL98/00018 1998-01-09

Publications (1)

Publication Number Publication Date
WO1999035414A1 true WO1999035414A1 (en) 1999-07-15

Family

ID=19866426

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1999/000012 WO1999035414A1 (en) 1998-01-09 1999-01-11 Rolling element bearing having a cooling cage

Country Status (3)

Country Link
EP (1) EP1044337A1 (en)
AU (1) AU2189899A (en)
WO (1) WO1999035414A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010049953A1 (en) 2010-10-21 2012-04-26 Imo Holding Gmbh Arrangement with devices for integrated cooling and / or heating and a method for integrated heating or cooling

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR500449A (en) * 1919-03-08 1920-03-12 Pierre Louis Ligez System for maintaining and guiding balls or rollers and outer and inner rings for ball or roller bearings
DE1030629B (en) * 1955-09-15 1958-05-22 Kurt Faedler One-sided roller bearing seal
GB961581A (en) * 1961-04-06 1964-06-24 Fafnir Bearing Co Improvements in or relating to bearings having rolling elements
FR2107436A5 (en) * 1970-09-09 1972-05-05 Skf Ind Trading & Dev
US3674356A (en) * 1970-10-30 1972-07-04 Barden Corp Cage for angular contact ball bearing
FR2191661A5 (en) * 1972-06-30 1974-02-01 Ferodo Sa
US3860302A (en) * 1973-06-29 1975-01-14 Woodrow W Gregg Ball bearing assembly
FR2389036A1 (en) * 1977-04-27 1978-11-24 Renault Thrust bearing for Macpherson strut - has ball cage with integrally formed lip seals and race retainers
FR2548297A1 (en) * 1983-06-28 1985-01-04 Roulements Soc Nouvelle Roller-retaining cage for rollers for rolling-contact bearings
US4797014A (en) * 1987-08-27 1989-01-10 Fag Kugelfischer Georg Schafer (Kgaa) High-speed anti-friction bearing particularly for airplane power plants
DE4133296A1 (en) * 1991-04-12 1993-01-28 Herter Tamara Ball bearing with self-lubrication - has rotational load impulse striking the rollers vertically for smooth running
DE19530903A1 (en) * 1994-08-31 1996-03-07 Barmag Barmer Maschf Roller bearing with rings and cage

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR500449A (en) * 1919-03-08 1920-03-12 Pierre Louis Ligez System for maintaining and guiding balls or rollers and outer and inner rings for ball or roller bearings
DE1030629B (en) * 1955-09-15 1958-05-22 Kurt Faedler One-sided roller bearing seal
GB961581A (en) * 1961-04-06 1964-06-24 Fafnir Bearing Co Improvements in or relating to bearings having rolling elements
FR2107436A5 (en) * 1970-09-09 1972-05-05 Skf Ind Trading & Dev
US3674356A (en) * 1970-10-30 1972-07-04 Barden Corp Cage for angular contact ball bearing
FR2191661A5 (en) * 1972-06-30 1974-02-01 Ferodo Sa
US3860302A (en) * 1973-06-29 1975-01-14 Woodrow W Gregg Ball bearing assembly
FR2389036A1 (en) * 1977-04-27 1978-11-24 Renault Thrust bearing for Macpherson strut - has ball cage with integrally formed lip seals and race retainers
FR2548297A1 (en) * 1983-06-28 1985-01-04 Roulements Soc Nouvelle Roller-retaining cage for rollers for rolling-contact bearings
US4797014A (en) * 1987-08-27 1989-01-10 Fag Kugelfischer Georg Schafer (Kgaa) High-speed anti-friction bearing particularly for airplane power plants
DE4133296A1 (en) * 1991-04-12 1993-01-28 Herter Tamara Ball bearing with self-lubrication - has rotational load impulse striking the rollers vertically for smooth running
DE19530903A1 (en) * 1994-08-31 1996-03-07 Barmag Barmer Maschf Roller bearing with rings and cage

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010049953A1 (en) 2010-10-21 2012-04-26 Imo Holding Gmbh Arrangement with devices for integrated cooling and / or heating and a method for integrated heating or cooling
WO2012052521A1 (en) 2010-10-21 2012-04-26 Imo Holding Gmbh Arrangement with devices for integrated cooling and/or heating and a method for the integrated heating or cooling
US9234548B2 (en) 2010-10-21 2016-01-12 Imo Holding Gmbh Bearing arrangements and integrated cooling and/or heating devices and method for integrated heating or cooling
DE102010049953B4 (en) * 2010-10-21 2021-04-15 Imo Holding Gmbh Arrangement with devices for integrated cooling and / or heating and a method for integrated heating or cooling

Also Published As

Publication number Publication date
AU2189899A (en) 1999-07-26
EP1044337A1 (en) 2000-10-18

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