Rocker arm device for simultaneous control of valve lift and relative timing in a combustion engine
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United States of America Patent
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Jul 8, 2003
Grant Date -
Sep 27, 2001
app pub date -
Apr 24, 2001
filing date -
Oct 20, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A valve control system including a valve actuating camshaft (A), having a high lift cam (B) and a low lift cam (C), and an outer rocker arm (2) engaging the high lift cam, and an inner rocker arm (3) engaging the low lift cam. The ends of the rocker arms adjacent the engine poppet valve (V) are fixed to each other by a connector pin (37). The system includes a latching mechanism disposed at the ends of the rocker arms opposite the connector pin (37). Latching of the rocker arms is accomplished by a compound pin (8) moved between latched (FIG. 14A) and unlatched (FIG. 14B) conditions in response to movement of an actuator (9). The system also includes a rocker ratio varying device, such that, during operation in the low lift mode, the lift can be gradually increased, and gradually phase-shifted, as the engine speed increases.
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