Electromagnetic valve driving apparatus for driving a valve of an internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorTakashi Izuo
Life of this patent
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Abstract
An electromagnetic valve driving apparatus which drives a valve of an internal combustion engine by using an electromagnetic attractive force. The electromagnetic valve apparatus includes a plunger holder which is fixed to the valve, and a plunger which is fixed to the plunger holder. The plunger allows more magnetic flux to flow than the plunger holder.
Claims21
An electromagnetic valve driving apparatus for driving a valve of an internal combustion engine by an electromagnetic attractive force, said valve driving apparatus comprising:
- a plunger holder formed of a first material fixedly secured to said valve;
- and
- a plunger having a through hole which has a diameter substantially the same as an outer diameter of an outermost circumferential portion of said plunger holder, wherein an inner circumference of said plunger is fixedly secured to the outermost circumferential portion of said plunger holder and wherein the plunger is formed of a second material having a higher magnetic property than said first material.
An electromagnetic valve driving apparatus for driving a valve of an internal combustion engine by an electromagnetic attractive force, said valve driving apparatus comprising:
- a plunger holder fixedly secured to said valve;
- a plunger fixedly secured to said plunger holder, a magnetic flux retained by said plunger being larger than a magnetic flux retained by said plunger holder, wherein an inner periphery of said plunger is substantially concentric with said plunger holder and wherein said plunger has a thickness which increases in a diametrical direction from an outer periphery toward a middle portion thereof.
An electromagnetic valve driving apparatus for driving a valve of an internal combustion engine by an electromagnetic attractive force, said valve driving apparatus comprising:
- a solenoid coil extending around a central axis and defining an inner circumference and an outer circumference;
- a magnetic core having an inner portion located within the inner circumference and an outer portion located outside the outer circumference;
- and
- a plunger facing said solenoid coil and said magnetic core so that a middle portion of the plunger faces the solenoid coil and inner and outer portions of the plunger face the inner and outer portions of said magnetic core, respectively, wherein a thickness of the middle portion of said plunger is greater than a thickness of the inner and outer portions of the plunger.
An apparatus for driving a valve of an internal combustion engine by an electromagnetic attractive force comprising:
- a plunger holder formed of a first material coupled to the valve, wherein the plunger holder extends radially outward from a central axis to an outer periphery;
- a plunger coupled around the outer periphery of the plunger holder, wherein the plunger is formed of a second material more strongly affected by magnetic forces than the first material.
Dependencies are inferred from the claim text.