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)

Applications Claiming Priority (3)

Publications (1)

Family

ID=19866426

Family Applications (1)

Country Status (3)

Families Citing this family (1)

Family Cites Families (12)

• 1999
  • 1999-01-11 AU AU21898/99A patent/AU2189899A/en not_active Abandoned
  • 1999-01-11 WO PCT/NL1999/000012 patent/WO1999035414A1/en not_active Application Discontinuation
  • 1999-01-11 EP EP99901995A patent/EP1044337A1/de not_active Withdrawn

Non-Patent Citations (1)

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