Drive mechanism for periodically moving at least one valve

Details Drive mechanism for periodically moving at least one valve Drive mechanism for periodically moving at least one valve

1998-04-10

1999-03-23

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

Electrical system

25112901, F01L 904

Patent

active

058845917

ABSTRACT:
An electromagnetic drive mechanism (1) for the periodic movement of at least one valve (2) for gas exchange of an internal combustion engine is provided. The valve (2) includes a disc-type rotor (9) located at an end (8) of its shaft (5). The rotor (9) is surrounded by a stator (12), a small gap (22) located between the rotor and the stator. The rotor (9) and stator (12) have ring windings (10, 13). When the stator (12) is supplies with electric voltage from a voltage converter (13a) with a microprocessor (14), the rotor (9) with the valve (2) is moved axially by the magnetic field which forms. The drive mechanism (1) operates selectively as a synchronous motor, reluctance motor, or asynchronous motor, and is provided with mechanisms (21) for current regeneration so that after the electric drive mechanism (1) is turned off immediately before reaching an excursion limit of the valve (2), the electric power gained in this way can be stored intermediately and supplied for the next lifting travel to the drive mechanism (1).

REFERENCES:
patent: 4641812 (1987-02-01), Vanderlaan et al.
patent: 4911404 (1990-03-01), Dorste et al.
patent: 5113824 (1992-05-01), Haubner
patent: 5494007 (1996-02-01), Schroeder et al.
patent: 5515818 (1996-05-01), Born
patent: 5592905 (1997-01-01), Born
patent: 5775276 (1998-07-01), Yanai et al.

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