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US 6,308,734 B1Granted
Dry running coolant union
AssigneeTalco, Inc.
InventorsBrian E. Smith, Ross A. Wenk
Life of this patent
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Abstract
A rotary union for delivery of a coolant fluid to a spindle of a metal working machine comprises a housing having a cylindrical bore containing bearings for journaling a tubular shaft therein wherein the improvement resides in the provision of a floating bushing seal as the high-pressure seal. The floating bushing seal assembly includes a seal housing containing a plurality of longitudinally disposed bushing rings that have a low clearance fit with respect to the tubular shaft of the rotary union.
Claims10
A rotary fluid coupling, comprising:
- (a) a housing having a wall defining a cylindrical bore;
- (b) a tubular shaft having a fluid inlet port and a fluid outlet port;
- (c) bearing means disposed in the cylindrical bore for journaling the tubular shaft for rotation therein;
- (d) a low-pressure, non-contacting fixed-clearance bushing seal assembly operatively disposed between the housing and the tubular shaft to inhibit fluid introduced at the fluid inlet port from reaching the bearing means;
- and
- (e) a high-pressure, non-contacting, fixed-clearance bushing seal assembly operatively disposed between the housing and the tubular shaft to inhibit fluid introduced at the fluid inlet port from reaching the low-pressure bushing seal assembly.
3 more elements
Dependencies are inferred from the claim text.