Multi-step valve actuation system

Details Multi-step valve actuation system Multi-step valve actuation system

2008-07-29

2008-07-29

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Rocker

C123S090440, C123S090450, C123S090480, C074S559000, C074S569000

Reexamination Certificate

active

07404386

ABSTRACT:
A multi-step valve actuation system is provided to selectively open a poppet valve of an internal combustion engine having a camshaft rotatably supported by a cylinder block. The multi-step valve actuation system includes a rocker arm operable to selectively open the poppet valve and a pushrod operable to bias the rocker arm. A first follower arm is engageable with a first cam of the camshaft and operates to selectively bias the pushrod. A lash adjuster is disposed between the first follower arm and the pushrod. A second follower arm is engageable with a second cam of the camshaft and selectively latchable with respect to the first follower arm, while a third follower arm is engageable with a third cam of the camshaft and selectively latchable with respect to the first follower arm. An internal combustion engine incorporating the multi-step valve actuation system of the present invention is also disclosed.

REFERENCES:
patent: 4459946 (1984-07-01), Burandt
patent: 4970997 (1990-11-01), Inoue et al.
patent: 5351662 (1994-10-01), Dopson et al.
patent: 5373818 (1994-12-01), Unger
patent: 6112711 (2000-09-01), Shimizu et al.
Diggs et al. Engine and Valvetrain with Dual Pushrod Lifters and Independent lash Adjustment, US Patent Application Publication, US 2007/0119397 A1, May 31, 2007.
SAE Document#: 2001/01/0243, A Study of a Continuous Variable Event and Lift (Vel) System, Book#: PT-122, Mar. 2001.

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