Aktiebolaget Skf

Ab Skf

Guillermo Enrique Morales Espejel

Rudolf Hauleitner

Hans Wallin

Mario Kammerhuber

Aidan Kerrigan

Christine Matta

Antonio Gabelli

Frederic Ponson

Charlotte Vieillard

Victor Brizmer

Kenred Stadler

Goran Lindsten

Eric Robert

Disclosed is a cooling system comprising a refrigerant cycle for cycling refrigerant from at least a compressor unit for com-pressing gaseous refrigerant to a condenser unit for condensing gaseous refrigerant to liquid refrigerant, from the condenser unit to an evaporator unit for evaporating the liquid refrigerant to gaseous refrigerant, and from the evaporating unit back to the compressor unit, and a lubrication cycle having at least one lubricating refrigerant supply line for providing refrigerant as lubricant to a bearing assembly, wherein the at least one lubricating refrigerant supply line branches off from the refrigerant cycle at the condenser unit for providing refrigerant to the bearing assembly, and re-unites with the refrigerant cycle at the evaporator unit, for feeding back refrigerant from the bearing assembly to the refrigerant cycle.

Cooling system and method for operating a cooling system

A cooling system and methods of employing the same includes a refrigerant cycle for cycling refrigerant from a compressor to a condenser and from the condenser an evaporator unit, and a lubrication cycle having at least one lubricating refrigerant supply line for providing refrigerant as lubricant to a bearing assembly.

Cooling system for a refrigerant lubricated bearing assembly

A rolling bearing having an inner raceway and an outer raceway and a plurality of rolling elements arranged therebetween. The rolling bearing is media-lubricated or oil-free lubricated. The lubricant forms an elasto-hydrodynamic lubricant film between the rolling elements and the raceways. At first use of the rolling bearing, at least one surface of the rolling bearing is coated with a protective fluid, preferably an oil-based preservative fluid. Also, a refrigerant compressor having such a rolling bearing.

Rolling bearing for refrigerant compressor

A Hybrid rolling bearing includes an inner raceway and an outer raceway and a plurality of rolling elements arranged therebetween. The outer raceway and the inner raceway are made from bearing steel, having a first surface RMS roughness R. The rolling elements are made from a ceramic material and have second surface RMS roughnesses R. At least one of the rolling elements has an increased surface RMS roughness R, which is significantly higher than the RMS roughnesses R, of the remaining rolling elements. The hybrid rolling bearing can be installed within a refrigerant compressor.

Hybrid rolling bearing, particularly for refrigerant compressor

A Hybrid ball bearing including an outer raceway, an inner raceway, and a plurality of balls arranged between the inner raceway and the outer raceway. The outer raceway and the inner raceway are made from bearing steel and have a first surface RMS roughness R. At least one ball of the plurality of balls is made from a ceramic material and has a second surface RMS roughness R. In a mint condition, the roughness of the raceways Ris 2 to 5 times higher than the roughness Rof the at least one ball, as well as a refrigerant compressor comprising such a hybrid ball bearing.

Hybrid ball bearing, particularly for refrigerant compressor

A cooling system includes a refrigerant compressor and a first operating medium, which provides a mixture of refrigerant and lubrication oil. An oil separator reduces the percentage of the refrigerant in the operating medium to a value between 15% by weight and 50% by weight.

Cooling system

A cooling system includes a refrigerant compressor and a first operating medium, which provides a mixture of refrigerant and lubrication oil. An oil separator reduces the percentage of the refrigerant in the operating medium to a value between 15% by weight and 60% by weight.

A cooling system includes a refrigerant compressor and a first operating medium, which provides a mixture of refrigerant and lubrication oil. An oil separator reduces the percentage of the refrigerant in the operating medium to a value between 25% by weight and 80% by weight.

A cooling system includes a refrigerant compressor and a first operating medium, which includes a mixture of refrigerant and lubrication oil. An oil separator reduces the percentage of the refrigerant in the operating medium so that a second lubrication oil enriched operating medium is provided by the oil separator, the provided second operating medium having at least in a second operating state a viscosity ratio of &#x3ba;&#x3e;1.

A hybrid roller bearing having an inner raceway and an outer raceway and a plurality of rollers arranged therebetween. The inner raceway and the outer raceway are made from bearing steel and have a first surface RMS roughness R. At least one roller is made from a ceramic material and has at least at the roller raceway a second surface RMS roughness R. The roughness of the raceways Ris 1.2 to 4 times higher than the roughness Rof the at least one roller, as well as a refrigerant compressor with such a hybrid roller bearing.

Hybrid roller bearing, particularly for refrigerant compressor

A bearing comprising a plurality of rolling elements arranged between an inner and outer raceway thereof. A rolling contact interface is between a first rolling contact surface on at least one rolling element and a second rolling contact surface formed by one of the inner and outer raceways. The first rolling contact surface has a first RMS roughness Rand a first roughness pattern &#x3b3;, expressed in terms of the Peklenik number &#x3b3;. The second rolling contact surface has a second RMS roughness Rand a second roughness pattern &#x3b3;. To minimize micropitting in the bearing, the rolling contact interface has a surface topography wherein (a) the roughness pattern of the first and second rolling contact surfaces are oriented in the direction of rolling, whereby &#x3b3;&#x2267;3.0 and &#x3b3;&#x2267;10.0; and (b) the first and of the second rolling contact surfaces have substantially equal roughness heights, whereby 0.8&#x2266;R/R&#x2266;1.25.

Bearing with improved resistance to micropitting

A method for lubricating a rolling element bearing by an ultra low viscosity volatile fluid comprises injecting a liquefied fluid flow into the bearing, lubricating rolling contacts between the rings and the rolling elements of the bearing by the liquefied fluid, providing a flow restriction for the liquefied fluid so as to maintain at least part of the fluid at a pressure which is above the evaporation pressure which is defined by evaporation of the fluid at the temperature or temperatures which prevail(s) in the bearing.

Method for lubricating a rolling element bearing by means of an ultra low viscosity volatile fluid, and bearing arrangement

A sliding bearing, such as a journal bearing, includes at least two bearing elements, the bearing surfaces of which are slidably supported with respect to each other. At least one of the surfaces is provided with a first type of cavity which may comprise a lubricating substance, the first type of cavity being defined by a specific range of geometric properties. At least one surface is provided with at least a second type of cavity which may comprise a lubricating surface, the second type of cavity being defined by geometric properties which are different from the geometric properties of the first type of cavity.

Growing community of inventors

Ijsselstein, Netherlands

Guillermo Enrique Morales Espejel