US 6,305,336 B1 · Electromagnetic driving device of engine valve for internal combustion engine

Abstract

An electromagnetic driving device of engine valve for internal combustion engine comprising an electromagnetic deriving mechanism includes a first and second electromagnets positioned opposite each other, an armature disposed in a gap formed between the electromagnets for moving therebetween, a follower having a first and second followers that are positioned opposite each other is for moving in relation to the armature, a valve associated with the armature for closing and opening an intake or exhaust passage, a first and second cams having gradually varied their profile are pivoted for contacting respective the first and second followers, a spring is disposed between the follower and the cams for urge the first and second cams toward the first and second followers, respectively. Thereby, the armature is prevented from colliding the electromagnet, and the valve capable of seating a valve seat smoothly and gently, so that the valve is possible to indicate an ideal valve lift characteristic at the end period of the valve. Therefore, this invention is possible to prevent noise, wearing and damage caused by the collision between the valve and the valve seat and between the armature and the electromagnet.

Claims19

Dependent claims

An electromagnetic device for driving an engine valve in an internal combustion engine,

the valve comprising a stem defining along its longitudinal dimension a movement axis and having at one end thereof a valve portion that engages a valve seat for closing and opening an exhaust passage, comprising:
an armature mechanically coupled to the valve stem;
an electromagnetic driving mechanism comprises first and second electromagnets, disposed on opposite sides of the armature and being separately operable to magnetically engage the armature;
a follower member, having first and second follower surfaces that are opposite to each other disposed along the movement axis and being coupled with the valve stem and the armature;
first and second cams having gradually varied profiles and being pivoted for contacting, respectively, the first and second follower surfaces;
first and second springs operative to urge the first and second cams toward the first and second follower surfaces, respectively;
and
a controller operative to selectively energize the electromagnets in accordance with an engine condition for controlling a movement of the armature.

5 more elements

An electromagnetic device for driving an engine valve in an internal combustion engine,

the valve comprising a stem defining along its longitudinal dimension a movement axis and having at one end thereof a valve portion that engages a valve seat for closing and opening an exhaust passage, comprising:
an armature mechanically coupled to the valve stem;
an electromagnetic driving mechanism comprises first and second electromagnets encased in a casing that is integral with a cylinder head and disposed on opposite sides of an armature and being separately operable to magnetically engage the armature;
a follower member, having first and second follower surfaces that are opposite to each other disposed along the movement axis and being coupled with the valve stem and the armature;
an armature spring interposed between the armature and the casing for urging the armature to open the valve;
a valve spring disposed between the valve and the cylinder head for urging the valve to close;
first and second cams having gradually varied profiles and being pivoted for contacting, respectively, the first and second follower surfaces;
first and second springs operative to urge the first and second cams toward the first and second follower surfaces, respectively;
and
a controller operative to selectively energize the electromagnets in accordance with an engine condition for controlling a movement of the armature.

7 more elements

Dependencies are inferred from the claim text.

Electromagnetic driving device of engine valve for internal combustion engine

Life of this patent

Electromagnetic driving device of engine valve for internal combustion engine

Life of this patent

Abstract

Claims19