Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1984-05-01
1985-03-05
Lazarus, Ira S.
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9016, 123 9027, F01L 134
Patent
active
045024260
ABSTRACT:
A variable valve lift and timing mechanism for an internal combustion engine, including a non-circular secondary cam having a head, with first and second convexly curved surfaces, at a free end thereof operably interposed between and slidably contacting a fixed profile primary cam and an associated valve lifter. The secondary cam is supported at the other end for pivotal movement about a fulcrum point spaced from its head. A control unit varies the position of the fulcrum point as a function of the speed of the engine to thereby vary the amount of lift and the timing of the opening and closing of said valve. The secondary cam is supported on a pivot shaft having a bracket carried on the engine cam for movement of the pivot shaft in and arc concentric with the axis of said cam shaft. The secondary cam head is non-circular and has first and second convexly curved surfaces slidably bearing against the primary cam and lifter respectively. The control unit comprises a hydraulic cylinder housing an actuating piston mechanically linked to the pivot shaft for controlling the movement of the same. The working chamber of the cylinder communicates with a source of engine lubrication pressurized oil having an output pressure correlated with engine speed whereby valve timing is advanced and valve lift increased with an increase in engine speed and vice versa. Other features include mid-speed positioning of the secondary cam by two-stage biasing springs, a pressure-regulating by-pass valve providing linearity in pressure change with engine speed change, and pressure transient and pulsation dampening.
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Bailey R. S.
Lazarus Ira S.
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