Engine valve actuation system
First Claim
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1. An engine valve actuation system, comprising:
- an engine valve moveable between a first position that blocks a flow of fluid and a second position that allows a flow of fluid;
a valve actuation assembly connected to move the engine valve between the first position and the second position;
a fluid actuator configured to selectively modify a timing of the engine valve in moving from the second position to the first position, the fluid actuator including a first piston;
the valve actuation assembly configured to move the engine valve independently with respect to the fluid actuator; and
an accumulator including a second piston, the second piston being slidably movable in the first piston.
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Abstract
An engine valve actuation system includes an engine valve moveable between a first position that blocks a flow of fluid and a second position that allows a flow of fluid. The system also includes a valve actuation assembly connected to move the engine valve between the first position and the second position and a fluid actuator configured to selectively modify a timing of the engine valve in moving from the second position to the first position. The fluid actuator includes a first piston. The system further includes an accumulator including a second piston, wherein the second piston is slidably movable in the first piston.
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Citations
52 Claims
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1. An engine valve actuation system, comprising:
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an engine valve moveable between a first position that blocks a flow of fluid and a second position that allows a flow of fluid; a valve actuation assembly connected to move the engine valve between the first position and the second position; a fluid actuator configured to selectively modify a timing of the engine valve in moving from the second position to the first position, the fluid actuator including a first piston; the valve actuation assembly configured to move the engine valve independently with respect to the fluid actuator; and an accumulator including a second piston, the second piston being slidably movable in the first piston. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of assembling an engine valve actuation system, comprising:
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operably coupling a valve actuation assembly with an engine valve such that the valve actuation assembly is configured to move the engine valve between a first position that blocks a flow of fluid and a second position that allows a flow of fluid; inserting an accumulator including an accumulator piston at least partially in an actuator piston such that the accumulator piston is slidably movable in the actuator piston; inserting a fluid actuator including the actuator piston at least partially in an actuator cylinder such that the actuator piston is slidably movable in the actuator cylinder; providing an adjustable gap between the valve actuation assembly and the fluid actuator; operably coupling the fluid actuator with the valve actuation assembly such that the fluid actuator is configured to selectively contact the valve actuation assembly to modify a timing of the engine valve in moving from the second position to the first position, the fluid actuator including a first piston; and inserting a snubbing valve including a snubber in the actuator cylinder such that the snubber is slidably movable in the actuator cylinder. - View Dependent Claims (18)
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19. An engine valve actuation system, comprising:
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an engine valve moveable between a first position that blocks a flow of fluid and a second position that allows a flow of fluid; a fluid actuator having a housing, a longitudinal axis, and an actuator piston slidably disposed in the housing and movable substantially along the longitudinal axis to selectively modify a timing of the engine valve in moving from the second position to the first position; a snubber slidably disposed in the housing and movable substantially along the longitudinal axis when the engine valve moves from the second position to the first position; and an accumulator piston slidably disposed in the housing and movable substantially along the longitudinal axis. - View Dependent Claims (20, 21, 22)
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23. An engine valve actuation system, comprising:
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an engine valve moveable between a first position that blocks a flow of fluid and a second position that allows a flow of fluid; a valve actuation assembly connected to move the engine valve between the first position and the second position; a fluid actuator configured to selectively engage the valve actuation assembly and modify a timing of the engine valve in moving from the second position to the first position, the fluid actuator including a first piston; an accumulator configured to dissipate energy from the engine valve actuation system, wherein the accumulator changes location during actuation of the fluid actuator; a snubbing valve configured to restrict a flow of fluid from the fluid actuator; and a flow path including at least one flow passage in the first piston and at least one flow passage in a stomp member in fluid communication with a tank. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. An engine valve actuation system, comprising:
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an engine valve moveable between a first position that blocks a flow of fluid and a second position that allows a flow of fluid; a valve actuation assembly connected to move the engine valve between the first position and the second position; a fluid actuator configured to selectively engage the valve actuation assembly and modify a timing of the engine valve in moving from the second position to the first position, the fluid actuator including a first piston; an accumulator configured to dissipate energy from the engine valve actuation system, wherein the accumulator changes location during actuation of the fluid actuator, a source of fluid in selective fluid communication with the fluid actuator; a directional control valve configured to control a flow of fluid between the source of fluid and the fluid actuator; a check valve, wherein the check valve and the directional control valve are disposed in parallel between the fluid actuator and the source of fluid; and a flow path including at least one flow passage in the first piston and at least one flow passage in a stop member in fluid communication with a tank. - View Dependent Claims (36)
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37. An engine valve actuation system, comprising:
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an engine valve moveable between a first position that blocks a flow of fluid and a second position that allows a flow of fluid; a valve actuation assembly connected to move the engine valve between the first position and the second position; a fluid actuator configured to selectively modify a timing of the engine valve in moving from the second position to the first position, the fluid actuator including a first piston disposed in a cylinder, the cylinder configured to be selectively movable relative to the engine valve; and an accumulator having an accumulator piston, a spring, and a variable volume chamber, the accumulator piston, spring, and variable volume chamber being disposed within the first piston. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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Specification