Oil seal system for shaft of turbocharger

In an oil seal system for the shaft of a turbocharger having a turbine and impeller mounted thereon in axially-spaced relation and an oil-trapping chamber formed by components thereof, in combination:

• (a) a combined turbine-impeller mounting shaft having a shoulder formed thereon inward from the impeller mounting portion thereof;
• (b) a bearing casing surrounding said shoulder and portions of said shaft on either side thereof;
• (c) a seal plate mounted to seal said casing and positioned between said impeller and said shoulder;
• (d) an oil thrower fitted on said shaft and having a first portion within said seal plate, a second portion extending axially towards said shoulder and having an oil-throwing flange formed thereon spaced outwardly from said shoulder;
• (e) a seal ring interposed between said oil thrower and said seal plate;
• (f) a thrust bushing fitted on said shaft and having one end abutting said shoulder and an opposite end abutting said oil-thrower flange;
• and
• (g) a thrust metal fixedly secured to said casing and surrounding in radially spaced relation a portion of said thrust bushing between said shoulder and said flange, said thrust metal having channels formed therein communicating with an oil supply enabling a flow of oil from such supply to flow on selected surfaces of said thrust bushing and said oil thrower and from such surfaces flow to a said oil trapping chamber below said oil thrower, said trapping chamber being formed by said casing, seal plate, oil thrower, seal ring, and thrust metal and having an oil discharge port extending through the bottom portion thereof with said oil-throwing flange being disposed within said chamber.