Presentation on theme: "Rollin’ Rollin’ Rollin’ By Nathan Powell And Jonathan Parkinson."— Presentation transcript:
Rollin’ Rollin’ Rollin’ By Nathan Powell And Jonathan Parkinson
Classifications Radial Thrust Tapered
Support only radial loads Radial
Thrust Supports only axial loads
Tapered Able to carry combinations of thrust and radial loads
Why Rollers? Support larger static and dynamic loads than ball bearings Less expensive for larger sizes and heavier loads than ball bearings.
Roller Vs. Sliding Advantages of Roller Bearings Low starting and operating friction Can support combined radial and thrust loads Less sensitive to interruptions of lubrication No self-excited instabilities Good low-temperature starting Can seal lubricant within bearing and “lifetime-lubricate” Typically require less space in axial direction Machine Design by Norton (676)
Roller Vs. Sliding Disadvantages of Roller Bearings May eventually fail from fatigue Require more space in radial direction Poor damping ability Higher noise level More severe alignment requirements Higher cost Higher friction (than hydrodynamic sliding) Machine Design by Norton (676)
Vendors Micro Miniature Bearing Co., Inc. –www.mmbbearings.comwww.mmbbearings.com Del-Tron Precision Inc. –www.deltron.comwww.deltron.com Berg, W. M., Inc –www.wmberg.comwww.wmberg.com Stock Drive Products/Sterling Instruments –www.sdp-si.comwww.sdp-si.com
Torrington manufactured its first bearing over 80 years ago. Significant product innovation dates from the early 1930's, when our engineers developed the drawn cup needle roller bearing, the outer ring of which is press-formed from strip steel rather than machined. Other technical breakthroughs have included: the needle roller thrust bearing, drawn cup roller clutch, wide inner ring bearing with eccentric locking collar, aircraft control bearings, the screwdown roller thrust bearing for metal rolling mills, and the innovative, assembled camshaft. Many specialized products have also been designed for specific applications.