US 4,058,981 AGranted

Lubricating system and method for turbocharged engines

AssigneeCaterpillar Tractor Co.

InventorRalph B. Henson

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Abstract

An engine comprises a pump adapted to communicate lubricating oil from the crank case thereof to a directional control valve. Upon engine start-up, the valve is conditioned to communicate oil through a filter and to a first manifold which, in turn, communicates with the crankshaft and rod bearings of the engine. Simultaneously therewith, cooled but unfiltered oil is communicated directly to bearings rotatably mounting a shaft in a turbocharger, mounted on the engine. After start-up, the valve will shift to further communicate unfiltered oil directly to a second manifold which, in turn, communicates with a plurality of jets for the purpose of cooling the pistons employed in the engine. The shifted valve will further function to permit communication of oil through the filter to the bearings of the turbocharger and to the crankshaft and rod bearings of the engine.

Claims9

Dependent claims

A lubricating system in combination with a turbocharged engine having crankshaft and rod bearings and pistons comprising,

first manifold means for communicating lubricant to crankshaft and rod bearings of said engine,
second manifold means for communicating lubricant to pistons of said engine,
a turbocharger mounted on said engine and having bearing means rotatably mounting a shaft therein,
pump means for communicating lubricant to said first and second manifold means and to said bearing means,
first conduit means for communicating lubricant from said pump means to said first manifold means,
second conduit means for communicating lubricant from said pump means to said second manifold means,
third conduit means for communicating lubricant from said pump means to said bearing means, and
direction control valve means, including expansible chamber means communicating with said first conduit means, connected to each of said first, second and third conduit means for automatically (a) communicating lubicant from said pump means to said first manifold means via said first conduit means and to said bearing means via said third conduit means upon start-up of said engine and for thereafter (b) communicating lubricant from said pump means to said first and second manifold means via said first and second conduit means, respectively, and to said bearing means via said third conduit means when the pressure of said lubricant exceeds a predetermined level in said expansible chamber means.

5 more elements

Dependencies are inferred from the claim text.