Internal combustion engine with gas exchange valve deactivation

Details Internal combustion engine with gas exchange valve deactivation Internal combustion engine with gas exchange valve deactivation

2007-02-27

2009-10-13

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Rocker

C123S090160, C123S090410, C029S888200, C074S559000

Reexamination Certificate

active

07600498

ABSTRACT:
An internal combustion engine with selectively deactivated intake and/or exhaust valves includes a fulcrum plate having a through hole with a slidable plunger supporting a pivot ball that engages an associated rocker arm. A solenoid positioned above the rocker arm cover is directly coupled to a latching mechanism that either allows or prevents sliding movement of the plunger to selectively deactivate associated intake/exhaust valves. When in the valve activated position, the rocker arm pivots about the pivot ball and opens the valve. When in the valve deactivated position, the plunger retracts at least partially into the fulcrum plate so that the rocker arm motion is insufficient to open the associated valve. A lost motion torsional spring acts on the plunger to provide an opposing force to the rocker arm and to return the plunger to the valve activated position during the base circle portion of camshaft rotation.

REFERENCES:
patent: 4221201 (1980-09-01), Soeters, Jr.
patent: 4222354 (1980-09-01), Uitvlugt
patent: 4227494 (1980-10-01), Uitvlugt
patent: 4380219 (1983-04-01), Walsh
patent: 4509467 (1985-04-01), Arai et al.

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