Fluent material handling – with receiver or receiver coacting mea – Processes – Gas or variation of gaseous condition in receiver
Patent
1989-11-21
1991-11-26
Cusick, Ernest G.
Fluent material handling, with receiver or receiver coacting mea
Processes
Gas or variation of gaseous condition in receiver
141 7, 141D12, 141 65, B65B 3100
Patent
active
050675281
ABSTRACT:
The filling of a rotatable shaft/thrust plate combination is disposed within a sleeve to form a first clearance space between the shaft and the sleeve and a second clearance space between the thrust plate and the sleeve. The external faces of the thrust plate are exposed to air. The clearance spaces are filled with a liquid lubricant and the sleeve includes pressure equalization ports connecting the first and second clearance spaces. Surface tension dynamic seals are provided between axially extending surfaces of the thrust plate and sleeve. The equalization ports balance the hydrodynamic pressures in the lubricant to prevent the lubricant being pumped through one of the dynamic seals. The resulting bearing provides high precision with low repetitive and nonrepetitive runouts. The bearing provides hydrodynamic support of both radial and axial loads and the bearing seal is relatively insensitive to orientation of the spindle and minimizes the generation of debris and contaminating particles.
REFERENCES:
patent: 1345347 (1920-07-01), Chaney
patent: 3859135 (1975-01-01), Roberts et al.
patent: 4051920 (1977-10-01), Reinsma
patent: 4061163 (1977-12-01), Decker et al.
patent: 4064919 (1977-12-01), Stern et al.
patent: 4175037 (1974-11-01), Benney et al.
patent: 4662410 (1987-05-01), Hatanaku
patent: 4928376 (1990-05-01), Poglitsch
Cordova Jackie
Schaule Max W.
Titcomb Forrest
Cusick Ernest G.
Digital Equipment Corporation
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