Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1998-12-11
2000-02-22
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9031, 123 9034, F01L 1344, F02D 1302
Patent
active
060267720
ABSTRACT:
A valve characteristic control apparatus for controlling the operation characteristics of the valves of an internal combustion engine driven by a camshaft is disclosed. A working oil supply control valve is arranged in a support member for supporting the camshaft. A first oil path and a second oil path for leading the working oil from the working oil supply control valve to the first and the second oil chambers include an annular first oil path and an annular second oil path formed in the camshaft and the slide portion of the support member for pivotally supporting the camshaft, a first and a second in-support member oil path for connecting the annular first oil path and the working oil supply control valve and for connecting the annular second oil path and the working oil supply control valve. A bearing metal is arranged between the annular oil paths and the cam-side openings of the in-support member oil paths, and at least one of the in-support member oil paths, after reaching the back of the metal bearing from the working oil supply control valve, extends in an axial direction along the back of the bearing metal and communicates with a corresponding annular oil path at a different axial position from the back point reached by the same in-support member oil path.
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Lo Weilun
Toyota Jidosha & Kabushiki Kaisha
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