Internal-combustion engines – Lubricators – Crankcase – pressure control
Patent
1987-07-31
1988-06-14
Cross, E. Rollins
Internal-combustion engines
Lubricators
Crankcase, pressure control
1841032, F01M 100
Patent
active
047504560
ABSTRACT:
An automatic oil level maintenance system for an internal combustion engine of the type having a crankcase containing a supply of oil and a vacuum source when the engine is running. An airtight oil reservoir contains a supply of make up oil and a vacuum actuated pump has a spring-biased flexible diaphragm therein. The crankcase, oil reservoir, pump, and vacuum are operatively connected by conduits, with the source of vacuum usually the carburetor of the engine. The pump maintains the oil in the crankcase at predetermined engine run and stop levels. The vacuum is applied to the diaphragm when the engine is running and any excess make up oil is withdrawn from the crankcase with the resulting oil level therein falling to an engine run level. The vacuum is removed from the diaphragm when the engine is stopped and make up oil is forced into the crankcase by movement of the spring-biased diaphragm with the resulting oil level in the crankcase rising to engine stop level. If oil is used by the engine during a run cycle, the system will add oil to the crankcase to maintain the level therein at the predetermined levels after one or more starts and stops of the engine.
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