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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 f

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.

대표청구항 ▼

[ What is claimed is:] [1.]1. 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)

[ What is claimed is:] [1.]1. 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.