Internal-combustion engines – Poppet valve operating mechanism – Electrical system
Patent
1996-11-12
1997-07-08
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
Electrical system
25112901, 25112916, 25112918, F01L 904
Patent
active
056450192
ABSTRACT:
An electromechanically actuated valve (12) for use as an intake or exhaust valve in an internal combustion engine. The valve (12) is actuated by a electromechanical actuator assembly (18) which includes a first electromagnet (22) and a second electromagnet (30). A disk (38) is slidably mounted to the valve (12) in a gap between the first and second electromagnets, with a pair of stops (36, 40) limiting its travel along the valve stem (15). The gap between the stops (36, 40) is large enough to allow for manufacturing tolerances and temperature changes in the assembly, with a secondary spring (56) and spring stop (54) acting to create soft landings, reducing noise and wear concerns. A first spring (48), mounted between the cylinder head (14) and disk (38), and a second spring (50), mounted between the disk (38) and an actuator housing (20), create an oscillatory system which drives most of the valve movement during engine operation, thus reducing power requirements to actuate the valves while increasing the responsiveness of the valves.
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Liang Feng
Stephan Craig Hammann
Ford Global Technologies Inc.
Lo Weilun
Wilkinson Donald A.
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