Oiling systems and methods for changing lengths of variable compression ratio connecting rods

1. Field of the Invention An engine has an oiling system including a pump () that delivers oil under nominal engine lubrication pressure to lubricate moving surfaces of the engine mechanism (). The system also has first and second control passages () to effect engine compression ratio change by oper...

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Bibliographic Details
Main Authors Styron, Joshua Putman, Imai, Yash Andrew, Schwartz, George Byron, Morrison, Kevin Michael
Format Patent
LanguageEnglish
Published 04.06.2002
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Summary:1. Field of the Invention An engine has an oiling system including a pump () that delivers oil under nominal engine lubrication pressure to lubricate moving surfaces of the engine mechanism (). The system also has first and second control passages () to effect engine compression ratio change by operating connecting rod length change mechanisms (A, B, C). Selectively operated hydraulic control devices cause pressure in the first passage to be greater than pressure in the second passage to effect an increase in engine compression ratio and pressure in the second passage to be greater than pressure in the first passage to effect a decrease in engine compression ratio. Multiple embodiments of the invention are disclosed.