Valve train system for extended duration intake valve opening
AssigneeCummins Ins.
InventorsAdam C. Cecil, Richard J. Gustafson
Life of this patent
Estimating the term…
Abstract
A variable valve timing assembly is provided for extending a duration of an intake valve opening. The variable valve timing assembly includes an intake rocker mounted on a pedestal and operable by a cam lobe to open and close the intake valve. The intake rocker includes a lever extension, and a holding member in the pedestal is lockable in position by a hydraulic circuit in the pedestal to contact the lever extension of the intake rocker and hold the intake valve in the open position. A reset pin in the pedestal is actuatable by the cam lobe to release the holding member to allow the intake valve to close.
Claims20
A selectively activatable variable valve timing (VVT) assembly for one or more cylinders of an internal combustion engine that includes a pedestal, the VVT assembly being configured to operatively engage an intake valve to extend a duration of the intake valve in an open position in response to an extended duration mode of operation, wherein the VVT assembly includes:
- an intake rocker mounted on the pedestal, the intake rocker operable by a cam lobe to open and close the intake valve, the intake rocker including a lever extension;
- a holding member in the pedestal lockable in position by a hydraulic circuit in the pedestal to contact the lever extension of the intake rocker and hold the intake valve in the open position;
- and
- a reset pin in the pedestal actuatable by the cam lobe to release the holding member to allow the intake valve to close.
A selectively activatable variable valve timing (VVT) assembly, comprising:
- a pedestal for mounting adjacent a cylinder of on an internal combustion engine;
- an intake rocker mounted on the pedestal and operable by a cam lobe to open and close an intake valve of the cylinder, the intake rocker including a lever extension;
- a holding member configured to extend from the pedestal to a lockable position to contact the lever extension of the intake rocker and hold the intake valve in the open position;
- and
- a reset pin movable into the pedestal by the cam lobe to release the holding member to allow the intake valve to close.
Dependencies are inferred from the claim text.