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 cylinder head having an interior surface defining a valve pocket, the cylinder head configured to be coupled to a cylinder and a gas manifold; and
a valve member having a portion defining a plurality of valve flow passages, the valve member configured to be disposable within the valve pocket such that the valve member is movable within the valve pocket along a longitudinal axis of the valve member, the apparatus having a first configuration, a second configuration, and a third configuration,
in the first configuration, each valve flow passage from the plurality of valve flow passages being in fluid communication with the cylinder and the gas manifold,
in the second configuration, each valve flow passage from the plurality of valve flow passages being fluidically isolated from the cylinder, and
in the third configuration, the valve member being disposed in a position different from the first configuration and the second configuration,
the valve member being biased toward the third configuration.
2. The apparatus of claim 1 , wherein the valve member is biased toward the third configuration by an actuator assembly and a return assembly.
3. The apparatus of claim 2 , wherein the actuator assembly includes a force application member, an actuator, and a biasing member, the force application member configured to move the valve member.
4. The apparatus of claim 3 , wherein the actuator includes a first electromagnetic coil, a second electromagnetic coil, and an armature, the actuator assembly having a first armature configuration in which the armature is in a first position adjacent to the first electromagnetic coil, a second armature configuration in which the armature is in a second position adjacent to the second electromagnetic coil, and a third armature configuration in which the armature is in a third position between the first position and the second position.
5. The apparatus of claim 4 , wherein when the actuator assembly is in the first armature configuration, the valve member is in the first configuration, when the actuator assembly is in the second armature configuration, the valve member is in the second configuration, and when the actuator assembly is in the third armature configuration, the valve member is in the third configuration.
6. The apparatus of claim 2 , wherein the return assembly includes a return biasing member and a return force application member, the return biasing member configured to move the valve member via a force applied to the return force application member.
7. The apparatus of claim 6 , wherein the return biasing member is a spring.
8. The apparatus of claim 6 , wherein the return biasing member is biased toward an expanded configuration.
9. The apparatus of claim 3 , wherein the biasing member is a spring.
10. The apparatus of claim 3 , wherein the biasing member is biased toward an expanded configuration.
11. The apparatus of claim 5 , wherein the return assembly includes a return biasing member and a return force application member, the return biasing member configured to move the valve member via a force applied to the return force application member, and wherein, in the absence of a current applied to the armature via the first electromagnetic coil or the second electromagnetic coil, the forces applied by the biasing member and the return biasing member cause the valve member to be disposed in the third configuration.
12. The apparatus of claim 1 , wherein when in the third configuration, at least one valve flow passage from the plurality of valve flow passages is partially obstructed by a portion of the cylinder head disposed between the at least one valve flow passage and the cylinder.
13. An apparatus, comprising:
a cylinder head having an interior surface defining a valve pocket, the cylinder head configured to be coupled to a cylinder and a gas manifold, a portion of the valve pocket including sealing portions, the sealing portions defining a plurality of cylinder flow passages; and
a valve member having a portion defining a plurality of valve flow passages, the valve member configured to be disposable within the valve pocket such that the valve member is movable within the valve pocket along a longitudinal axis of the valve member, the apparatus having a first configuration, a second configuration, and a third configuration,
in the first configuration, each valve flow passage from the plurality of valve flow passages is in fluid communication with the cylinder and the gas manifold, the plurality of valve flow passages in fluid communication with the cylinder via the plurality of cylinder flow passages,
in the second configuration, each valve flow passage from the plurality of valve flow passages is fluidically isolated from the cylinder via the sealing portions of the valve pocket, and
in the third configuration, an opening to each of the plurality of valve flow passages is at least partially obstructed by the sealing portions of the valve pocket such that each valve flow passage from the plurality of valve flow passages is in fluid communication with the cylinder and the gas manifold, the valve member being biased toward the third configuration.
14. The apparatus of claim 13 , wherein, when in the third configuration, the openings to each of the plurality of valve flow passages are about 50% obstructed by the sealing portions of the valve pocket.
15. The apparatus of claim 13 , wherein, when in the first configuration, each of the valve flow passages of the plurality of valve flow passages is axially aligned with a cylinder flow passage from the plurality of cylinder flow passages.
16. The apparatus of claim 13 , wherein, when in the first configuration, at least one of the valve flow passages of the plurality of valve flow passages converges toward a corresponding cylinder flow passage from the plurality of cylinder flow passages, and the corresponding cylinder flow passage converges toward the at least one of the valve flow passages.
17. The apparatus of claim 13 , wherein at least one of the plurality of valve flow passages and the plurality of cylinder flow passages have a central axis angled at a non-zero angle relative to a central axis of the cylinder head.
18. The apparatus of claim 17 , wherein the non-zero angle is between about twenty degrees and about forty degrees.
19. The apparatus of claim 13 , wherein the valve member includes a first upper surface, a second upper surface, and a bottom surface, the first upper surface lying in a plane parallel to a plane containing the bottom surface, the second upper surface lying in a plane at an angle relative to the first upper surface.
20. The apparatus of claim 19 , wherein the valve pocket has a first valve pocket upper surface and a second valve pocket upper surface, the first valve pocket upper surface lying in a plane parallel to the plane containing the first upper surface of the valve member, the second valve pocket upper surface lying in a plane parallel to the plane containing the second upper surface of the valve member, the second upper surface of the valve member and the second valve pocket upper surface configured to be in abutting contact when the valve member is in the second configuration.