| 摘要 |
This invention proposes a poppet valve actuation system in which the poppet valve is operated, via a cam follower, by a cam, which has a shaft passing through it, concentric with the bearings that support the aforementioned cam, and the said cam being joined by (2) pivoted links to a connecting rod, driven by a crankshaft, the first link, referred to as the "cam link", being rotatably connected at one end of the link to the cam, whilst the other end of the first link connects rotatably to one end of the second link, this second link, referred to as "control link" being rotatably connected, along its length, to the small end of the said connecting rod, the other end of this second link, termed the "free" end, being connected, via an appropriate mechanical joint, to an actuator that may apply a displacement to this free end of the control link, such that the control link's angularity relative to the first link and therefore the angular displacement of the cam can be adjustably controlled by the said displacement of the free end of the control link causing rotation about the connection of the control link with the small-end of the said connecting rod, the big end of which being free to rotate on the said crankshaft, the said crankshaft being driven in appropriate phase with the main engine crankshaft, and said crankshaft being on a parallel and different axis to that of the aforementioned bearing support shaft that passes through the cam. The actuator may be electrically driven and controlled, in response to signals from a sensor on the poppet valve or actuator shaft, in feedback or feedforward mode. |
