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1 International Journal of Applied Mechanics and Engineering

1 2005

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Inside-out pivoted-pad bearing with controllable stiffness

100%

Adams Jr. M. L. , Laurich M. A.

International Journal of Applied Mechanics and Engineering

2005

tom Vol. 10, no 3

395-406

It has recently been demonstrated that high-speed grinding principles can be applied to the finishing of silicon nitride (ceramic) with considerable improvements in throughput, costs, and quality. This will require new high-speed high-power centerless grinding machines (7.000 rpm, 50 hp), with high-stiffness (2.000.000 lb/in) spindles. To meet the life, stiffness and speed requirements of this next generation grinding spindle, a novel inside-out, three-pad, pivoting-pad oil-fed hydrodynamic journal bearing has been devised, built and tested. The journal rotates externally about the bearing pads which are thus loaded against an internal shaft diameter. That is, an inside-out version of the conventional pivoted-pad journal bearing. Two of the three pivoting pads have fixed-support pivot points while the third pad’s pivot point is supported by a hydraulically-actuated radial-motion loading piston. This radial pad actuation provides a real-time controllable preload to the other two bearing pads and thereby controls the overall stiffness of the bearing. With this new bearing design, it is now possible to control spindle support stiffness, in real time, providing less-stiff spindle bearings for initial rough grinding and very high stiffness spindle bearings for precision finish grinding. Extensive bearing test data compare favourably with theoretically predicted bearing performance.