NDLI: Active Outer Ring Cooling of High Loaded and High Speed Ball Bearings

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Flouros, Michael Hirschmann, Markus Cottier, Francois Gloeckner, Peter Dullenkopf, Klaus
Copyright Year	2012
Abstract	Bearings for aero engine applications are subjected to a high thermal impact because of the elevated speeds and loads. The high rate of heat generation in the bearing cannot be sustained by the materials used and in the absence of lubrication will fail within seconds. For this reason aero engine bearings have to be lubricated and cooled by a continuous oil stream. The heat which is generated in the bearings through friction is transferred into the oil. Oil itself has not unlimited capabilities and can only remove heat as long as its temperature does not reach critical limits. When the critical limits have been reached or even exceeded the oil will suffer chemical decomposition (coking) with loss of its properties and subsequently causing a detrimental impact on the rotating machinery. Oil is normally transferred into the bearings through holes in the inner ring thus taking advantage of the centrifugal forces due to the rotation. In its way through the bearing the oil continuously removes heat from the inner ring, the rolling elements and the bearing cage until it reaches the outer ring. Since the oil has already been heated up its capability to remove heat from the outer ring is considerably reduced. The idea to provide the bearing with an “unlimited” quantity of oil to ensure proper cooling cannot be considered since an increase in the oil quantity leads to higher parasitic losses (churning) in the bearing chamber and increased requirements on the engine’s lubrication system in terms of storage, scavenging, cooling, weight, etc, not mentioning the power needed to accomplish all these. In this sense, the authors have developed a method which would enable active cooling of the outer ring. Similar to fins which are used for cooling electronic devices, a spiral groove engraved in the outer ring material would function as a fin body with oil instead of air as the cooling medium. The number of “threads” and the size of the groove design characteristics were optimized in a way that enhanced heat transfer is achieved without excessive pressure losses. An experimental set up was created for this reason and a 167.5mm PCD (Pitch Circle Diameter) ball bearing was investigated. The bearing was tested with and without the outer ring cooling. A reduction of 50% of the lubricant flow through the inner ring associated with a 30% decrease in heat generation was achieved.
Sponsorship	International Gas Turbine Institute
Starting Page	1
Ending Page	8
Page Count	8
File Format	PDF
ISBN	9780791844670
DOI	10.1115/GT2012-68138
Volume Number	Volume 1: Aircraft Engine; Ceramics; Coal, Biomass and Alternative Fuels; Controls, Diagnostics and Instrumentation
Conference Proceedings	ASME Turbo Expo 2012: Turbine Technical Conference and Exposition
Language	English
Publisher Date	2012-06-11
Publisher Place	Copenhagen, Denmark
Access Restriction	Subscribed
Subject Keyword	Temperature Cooling Ball bearings Lubricants Bearings Screw threads Fins Industrial lubrication systems Aircraft engines Flow (dynamics) Machinery Pressure Rotation Stress Thread Design Heat Storage Friction Weight (mass) Centrifugal force Lubrication Heat transfer
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Mr. Siddhartha Mukherjee siddhartha@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	ndl-support@iitkgp.ac.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Libarray of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Oil Pumping in High Speed and High Loaded Ball Bearings

Active Outer Ring Cooling of High-Loaded and High-Speed Ball Bearings

Direct Outer Ring Cooling of a High Speed Jet Engine Mainshaft Ball Bearing: Experimental Investigation Results

Rotating Loosening Mechanism of Nut Connecting Rotary Disc Under Rotating-Bending Force

Ball Motion and Sliding Friction in an Arched Ball Bearing

Active magnetic bearings of high reliability

Direct Outer Ring Cooling of a High Speed Jet Engine Mainshaft Ball Bearing: Experimental Investigation Results

Rolling Friction in MEMS Ball Bearings: The Effects of Loading and Solid Film Lubrication

Effects of Ultra-Clean and Centrifugal Filtration on Rolling-Element Bearing Life

Active Outer Ring Cooling of High Loaded and High Speed Ball Bearings

Similar Documents

Oil Pumping in High Speed and High Loaded Ball Bearings

Active Outer Ring Cooling of High-Loaded and High-Speed Ball Bearings

Direct Outer Ring Cooling of a High Speed Jet Engine Mainshaft Ball Bearing: Experimental Investigation Results

Rotating Loosening Mechanism of Nut Connecting Rotary Disc Under Rotating-Bending Force

Ball Motion and Sliding Friction in an Arched Ball Bearing

Active magnetic bearings of high reliability

Direct Outer Ring Cooling of a High Speed Jet Engine Mainshaft Ball Bearing: Experimental Investigation Results

Rolling Friction in MEMS Ball Bearings: The Effects of Loading and Solid Film Lubrication

Effects of Ultra-Clean and Centrifugal Filtration on Rolling-Element Bearing Life

Active Outer Ring Cooling of High Loaded and High Speed Ball Bearings