Variable travel valve apparatus for an internal combustion engine
An apparatus includes a valve and an actuator. The valve has a portion movably disposed within a valve pocket defined by a cylinder head of an engine. The valve is configured to move relative to the cylinder head a distance between a closed position and an opened position. The portion of the valve defines a flow opening that is in fluid communication with a cylinder of an engine when the valve is in the opened position. The actuator is configured to selectively vary the distance between the closed position and the opened position.
1. An apparatus, comprising:
a valve having a portion movably disposed within a valve pocket defined by a cylinder head of an engine, the portion of the valve defining a flow opening, the valve configured to move relative to the cylinder head a distance between a closed position and an opened position, the flow opening in fluid communication with a cylinder of an engine when the valve is in the opened position;
a first actuator configured to selectively vary the distance between the closed position and the opened position; and
a second actuator configured to move the valve between the closed position and the opened position independent of a rotational position of a crankshaft of the engine.
2. The apparatus of claim 1 , wherein:
the first actuator is configured to vary the distance between a minimum value and a maximum value; and
the valve is disposed outside of the cylinder of the engine when the valve is in the opened position and the distance is at the maximum value.
3. The apparatus of claim 1 , wherein the portion of the valve is tapered such that at least one of a width or a thickness of the portion decreases linearly along a longitudinal axis of the valve.
4. An apparatus, comprising:
a valve having a portion movably disposed within a flow passageway defined by a cylinder head of an engine, the valve configured to move relative to the cylinder head a distance between a closed position and an opened position, the valve configured to move independent of the rotation of a crankshaft of the engine, the portion of the valve is configured to move within the flow passageway along a longitudinal axis of the valve, the longitudinal axis of the valve being substantially normal to a longitudinal axis of a cylinder of the engine;
a biasing member configured to bias the valve towards the closed position, the biasing member configured to exert a force on the valve when the valve is in the closed position; and
an actuator configured to selectively vary the distance between the closed position and the opened position, the force exerted by the biasing member on the valve being maintained at a substantially constant value when the valve is in the closed position.
5. The apparatus of claim 4 , wherein the valve is disposed outside of the cylinder of the engine when the valve is in the opened position and the distance is at a maximum value.
6. The apparatus of claim 4 , wherein the biasing member is a spring, a length of the spring when the valve is in the closed position being independent of the distance between the closed position and the opened position.
7. The apparatus of claim 4 , wherein the actuator is an electronic actuator.
8. The apparatus of claim 4 , wherein the actuator is configured to move a solenoid relative to the cylinder head.
9. The apparatus of claim 4 , wherein the actuator is a first actuator, the apparatus further comprising:
a second actuator configured to move the valve between the closed position and the opened position.
10. The apparatus of claim 4 , wherein the actuator is a first actuator, the apparatus further comprising:
a second actuator configured to move the valve between the closed position and the opened position, the second actuator configured to contact a first end portion of the valve,
the biasing member configured to contact a second end portion of the valve, the second end portion opposite the first end portion.
11. The apparatus of claim 4 , wherein the actuator is a first actuator, the apparatus further comprising:
a second actuator configured to move the valve between the closed position and the opened position, the second actuator including:
a solenoid, the first actuator configured to move the solenoid relative to the cylinder head; and
an armature disposed between the solenoid and a sealing portion of the valve.
12. An apparatus, comprising:
a valve having a portion movably disposed within a flow passageway defined by a cylinder head of an engine, the valve configured to move relative to the cylinder head a distance between a closed position and an opened position, the portion of the valve is tapered such that at least one of a width or a thickness of the portion decreases linearly along a longitudinal axis of the valve; and
an actuator assembly configured to move the valve between the closed position and the opened position, the actuator configured to selectively vary the distance through which the valve moves when the valve is moved between the closed position and the opened position, the actuator assembly including:
a solenoid configured to move relative to the cylinder head when the actuator varies the distance between closed position and the opened position; and
an armature disposed between the solenoid and a sealing portion of the valve.
13. The apparatus of claim 12 , wherein the solenoid is a first solenoid, the actuator being devoid of a second solenoid.
14. The apparatus of claim 12 , wherein the solenoid is configured to move relative to the cylinder head between a first position and a second position, a force exerted by a biasing member on the valve when the valve is in the closed position being substantially constant when the solenoid is moved between the first position and the second position.
15. The apparatus of claim 12 , further comprising:
a spring configured to bias the valve within the cylinder head towards the closed position, a length of the spring when the valve is in the closed position being independent of the distance between the closed position and the opened position.
16. The apparatus of claim 12 , wherein:
the valve is configured to move in a first direction from the closed position to the opened position; and
the solenoid is configured to move in a second direction substantially opposite the first direction when the actuator increases the distance between the closed position and the opened position.
17. The apparatus of claim 12 , wherein the valve is disposed outside of a cylinder of the engine when the valve is in the opened position and the distance is at a maximum value.
18. The apparatus of claim 12 , wherein the actuator is configured to selectively vary the distance between the closed position and the opened position from a minimum value of approximately 0.000 inches to a maximum value of approximately 0.090 inches.
19. An apparatus, comprising:
a valve having a portion movably disposed within a flow passageway defined by a cylinder head of an engine, the valve configured to move relative to the cylinder head a distance between a closed position and an opened position, the valve configured to move independent of the rotation of a crankshaft of the engine, the valve being disposed outside of a cylinder of the engine when the valve is in the opened position;
a first actuator configured to selectively vary the distance between the closed position and the opened position; and
a second actuator configured to move the valve between the closed position and the opened position, the second actuator including:
a solenoid, the first actuator configured to move the solenoid relative to the cylinder head; and
an armature disposed between the solenoid and a sealing portion of the valve.
20. The apparatus of claim 19 , wherein the first actuator is an electronic actuator.
21. The apparatus of claim 19 , further comprising:
a biasing member configured to exert a force on the valve when the valve is in the closed position, the force exerted by the biasing member on the valve being maintained at a substantially constant value when the actuator varies the distance between the closed position and the opened position.
22. An apparatus, comprising:
a valve having a portion movably disposed within a valve pocket defined by a cylinder head of an engine, the portion of the valve defining a flow opening, the valve configured to move relative to the cylinder head a distance between a closed position and an opened position, the flow opening in fluid communication with a cylinder of an engine when the valve is in the opened position, the portion of the valve being tapered such that at least one of a width or a thickness of the portion decreases linearly along a longitudinal axis of the valve; and
an actuator configured to selectively vary the distance between the closed position and the opened position.
23. The apparatus of claim 22 , wherein:
the actuator is configured to vary the distance between a minimum value and a maximum value; and
the valve is disposed outside of the cylinder of the engine when the valve is in the opened position and the distance is at the maximum value.
24. The apparatus of claim 22 , wherein the portion of the valve is configured to move within a flow passageway along the longitudinal axis of the valve, the longitudinal axis of the valve being substantially normal to a longitudinal axis of the cylinder of the engine.
25. The apparatus of claim 22 , wherein the actuator is an electronic actuator.
26. The apparatus of claim 22 , wherein the actuator is a first actuator, the apparatus further comprising a second actuator configured to move the valve between the closed position and the opened position.