Valve driving apparatus
First Claim
1. A valve driving apparatus for driving a valve element controlling intake gas flow or exhaust gas flow of an internal combustion engine, comprising:
- a valve driving portion including a magnetic path which comprises;
a magnetic flux generating element comprising an electromagnetic coil wound so as to generate a magnetic flux; and
a magnetic field generating element comprising three pole members to distribute the magnetic flux and form at least one magnetic field;
a magnetized member that is movable within said magnetic field in cooperation with a valve rod that is integral with a valve element, said magnetized member having two magnetized surfaces with different polarities; and
a current supply for supplying a driving current to said electromagnetic coil so as to correspond to a valve opening direction and a valve closing direction;
wherein said three pole members are aligned in a lengthwise direction of said valve rod;
wherein said electromagnetic coil is wound about an axis perpendicular to the lengthwise direction; and
wherein a gap between one of said three pole members and said magnetized member is different in size from a gap between at least one other of said three pole members and said magnetized member.
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Accused Products
Abstract
A valve driving apparatus includes a magnetic flux generating element in which an electromagnetic coil is wound to generate magnetic flux, a magnetic field generating element which has at least two poles to distribute magnetic flux and form at least one magnetic field region, a drive means which includes a magnetic path member, and a magnetized member arranged in accordance with the magnetic field region and having two magnetized faces with mutually different polarity to be connected and moved together with a valve rod united with a valve element. A current supply means supplies driving current to the electromagnetic coil whereby the current has polarities corresponding to either a valve closing direction or a valve opening direction of the valve element. The apparatus reduce impact of valve seating with a simple structure and controls the valve with less power consumption and with precision.
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Citations
7 Claims
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1. A valve driving apparatus for driving a valve element controlling intake gas flow or exhaust gas flow of an internal combustion engine, comprising:
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a valve driving portion including a magnetic path which comprises;
a magnetic flux generating element comprising an electromagnetic coil wound so as to generate a magnetic flux; and
a magnetic field generating element comprising three pole members to distribute the magnetic flux and form at least one magnetic field;
a magnetized member that is movable within said magnetic field in cooperation with a valve rod that is integral with a valve element, said magnetized member having two magnetized surfaces with different polarities; and
a current supply for supplying a driving current to said electromagnetic coil so as to correspond to a valve opening direction and a valve closing direction;
wherein said three pole members are aligned in a lengthwise direction of said valve rod;
wherein said electromagnetic coil is wound about an axis perpendicular to the lengthwise direction; and
wherein a gap between one of said three pole members and said magnetized member is different in size from a gap between at least one other of said three pole members and said magnetized member. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A valve driving apparatus for driving a valve element controlling intake gas flow or exhaust gas flow of an internal combustion engine, comprising:
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a valve driving portion including a magnetic path which comprises;
a magnetic flux generating element comprising an electromagnetic coil wound so as to generate a magnetic flux; and
a magnetic field generating element comprising three pole members to distribute the magnetic flux and form at least one magnetic field;
a magnetized member that is movable within said magnetic field in cooperation with a valve rod that is integral with a valve element, said magnetized member having two magnetized surfaces with different polarities;
a current supply for supplying a driving current to said electromagnetic coil so as to correspond to a valve opening direction and a valve closing direction;
wherein said three pole members are aligned in a lengthwise direction of said valve rod;
wherein said electromagnetic coil is wound about an axis perpendicular to the lengthwise direction;
wherein said magnetic field generating element comprises a yoke and a core inside said yoke, and said magnetic path comprises a gap in said yoke that magnetically separates a first part of said yoke including one of said three pole members from a second part of said yoke and from said core, said second part of said yoke and said core including the other two of said three pole members; and
wherein a gap between said one of said three pole members and said valve rod that is larger than a gap between the other two of said three pole members and said valve rod.
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Specification