Valvetrain systems for cylinder deactivation with recharging and methods thereof
AssigneeEaton Intelligent Power Limited
InventorsTomas BILEK, Alessandro ROSCIOLI, Vladimír BALHÁREK
Life of this patent
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Abstract
A rocker arm assembly operable in a cylinder deactivation mode includes a valve portion, a drive cam portion, and a recharge cam portion. The valve portion is configured to operatively engage with one or more valves of a cylinder. The drive cam portion comprises a switchable lost motion mechanism that is configured to selectively absorb or transfer motion from a drive cam to the valve portion. The recharge cam portion is configured to be coupled to the valve portion.
Claims20
A rocker arm assembly of a valvetrain operable in a cylinder deactivation mode, the rocker arm assembly comprising:
- a valve portion configured to operatively engage with one or more valves of a cylinder;
- a drive cam portion configured to operatively engage with a drive cam associated with a drive cam lift profile, the drive cam portion comprising a switchable lost motion mechanism configured to selectively absorb motion from the drive cam or transfer motion from the drive cam to the valve portion;
- and
- a recharge cam portion configured to be rotatably coupled to the valve portion;
- wherein when the cylinder deactivation mode is enabled,
- the switchable lost motion mechanism is configured to absorb motion from the drive cam to deactivate the cylinder, and
- the recharge cam portion is configured to operatively engage with a recharge cam associated with a recharge valve lift profile and transfer motion from the recharge cam to the valve portion to permit balancing pressure within the deactivated cylinder.
A method of operating a valvetrain comprising, when a cylinder deactivation mode of the valvetrain is enabled,
- absorbing, by a switchable lost motion mechanism of a rocker arm assembly of the valvetrain, motion received from a drive cam by a drive cam portion of the rocker arm assembly to deactivate a cylinder associated with the valvetrain, the drive cam associated with a drive cam lift profile;
- and
- transferring, by a recharge cam portion of the rocker arm assembly to a valve portion of the rocker arm assembly, motion received from a recharge cam by the recharge cam portion to open one or more valves associated with the cylinder to permit balancing pressure within the deactivated cylinder, the recharge cam associated with a recharge valve lift profile,
- wherein the switchable lost motion mechanism is configured to selectively absorb motion from the drive cam or transfer motion from the drive cam to the valve portion.
A valvetrain system comprising:
- a cylinder configured to be selectively deactivated;
- one or more valves associated with the cylinder;
- a drive cam and a recharge cam associated with the one or more valves;
- a rocker shaft;
- a rocker arm assembly configured to be rotatable about the rocker shaft, the rocker arm assembly comprising:
- a valve portion configured to operatively engage with the one or more valves;
- a drive cam portion configured to operatively engage with a drive cam associated with a drive cam lift profile, the drive cam portion comprising a switchable lost motion mechanism configured to selectively absorb motion from the drive cam or transfer motion from the drive cam to the valve portion;
- and
- a recharge cam portion configured to be rotatably coupled to the valve portion;
- wherein when an cylinder deactivation mode is enabled,
- the switchable lost motion mechanism is configured to absorb motion from the drive cam to deactivate the cylinder, and
- the recharge cam portion is configured to operatively engage with a recharge cam associated with a recharge valve lift profile and transfer motion from the recharge cam to the valve portion to permit balancing pressure within the deactivated cylinder.
Dependencies are inferred from the claim text.