Hydraulic cam for variable timing/displacement valve train

Details Hydraulic cam for variable timing/displacement valve train Hydraulic cam for variable timing/displacement valve train

2007-05-01

2007-05-01

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

C123S090150, C123S19800E, C251S149000, C251S149100

Reexamination Certificate

active

11156262

ABSTRACT:
A hydraulic fluid cam providing variable valve actuation in an engine is disclosed. In one embodiment, the hydraulic fluid cam is adapted to vary valve timing while holding valve displacement constant. In another embodiment, the hydraulic fluid cam is adapted to vary valve displacement, while holding valve timing constant. Some embodiments are adapted to vary both valve timing and displacement simultaneously to optimize engine performance.

REFERENCES:
patent: 4479512 (1984-10-01), Ohrendorf et al.
patent: 5056478 (1991-10-01), Ma
patent: 5456221 (1995-10-01), Schechter
patent: 5562070 (1996-10-01), Schechter et al.
patent: 6666181 (2003-12-01), Smith et al.
patent: 6694934 (2004-02-01), Preston et al.

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