US 10,669,901 B2Granted

Rocker arm assembly for engine brake

AssigneeEaton Intelligent Power Limited

InventorMajo Cecur

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Abstract

A rocker arm assembly for use in a valve train carrier, the rocker arm assembly being rotatable around a rocker shaft supported by the valve train carrier based upon a lift profile provided on a cam that rotates with a camshaft, a rotation of the rocker arm assembly causing translation of a corresponding engine valve, includes: a rocker arm body having an opening that receives the rocker shaft, the rocker arm body further defining an oil supply channel; a capsule assembly disposed on the rocker arm body and that selectively communicates oil to and from the oil supply channel, the capsule assembly including: a plunger assembly having a plunger that selectively translates within a plunger chamber between an extended rigid position based upon the plunger chamber being pressurized with oil and a retracted non-rigid position based upon the plunger chamber being depressurized, the plunger moving move the engine valve.

Claims24

Dependent claims

A rocker arm assembly configured for use in a valve train carrier, the rocker arm assembly being rotatable around a rocker shaft supported by the valve train carrier based upon a lift profile provided on a cam that rotates with a camshaft, a rotation of the rocker arm assembly causing translation of a corresponding engine valve, the rocker arm assembly comprising:

a rocker arm body having an opening that receives the rocker shaft, the rocker arm body further defining an oil supply channel;
a capsule assembly disposed on the rocker arm body and configured to selectively communicate oil to and from the oil supply channel, the capsule assembly comprising:
a plunger assembly having a plunger configured to selectively translate within a plunger chamber between an extended rigid position based upon the plunger chamber being pressurized with oil and a retracted non-rigid position based upon the plunger chamber being depressurized, the plunger being configured to move the engine valve toward an open position;
and
a shuttle assembly configured to move between a first position and a second position based upon oil communicated in the oil supply channel, the shuttle assembly having a shuttle valve configured to selectively move between a closed position and an open position, wherein in the open position oil flows into the plunger chamber, and
wherein the rocker arm assembly is configured to sequentially move along a (i) a first valve lift profile wherein pressurized oil is communicated from the oil supply channel, the shuttle assembly being configured to move into the second position causing the shuttle valve to be opened, the plunger chamber to be pressurized, and the plunger to move to the extended rigid position, (ii) a reset valve lift profile wherein pressurized oil is not communicated from the oil supply channel, the shuttle assembly being configured to move into the first position, and (iii) a valve closing profile.

3 more elements

A rocker arm assembly configured for use in a valve train carrier, the rocker arm assembly comprising:

a first exhaust rocker arm assembly rotatable around a rocker shaft supported by the valve train carrier based upon a first lift profile provided on a first cam configured to rotate with a camshaft, a rotation of the first exhaust rocker arm assembly causing translation of a corresponding first engine exhaust valve, the first exhaust rocker arm assembly comprising a first rocker arm body having a first capsule assembly configured to move through a first reset function that changes a lift profile of the first engine exhaust valve;
a second exhaust rocker arm assembly rotatable around the rocker shaft based upon a second lift profile provided on a second cam configured to rotate with the camshaft, a rotation of the second exhaust rocker arm assembly causing translation of a corresponding second engine exhaust valve, the second exhaust rocker arm assembly comprising a second rocker arm body having a second capsule assembly configured to move through a second reset function that changes a lift profile of the second engine exhaust valve,
wherein the first exhaust rocker arm assembly is configured for decompression engine braking and the second exhaust rocker arm assembly is configured for early exhaust valve opening.

A rocker arm assembly configured for use in a valve train carrier, the rocker arm assembly comprising:

a first exhaust rocker arm assembly rotatable around an exhaust rocker shaft supported by the valve train carrier based upon a first lift profile provided on a first cam configured to rotate with an exhaust camshaft, a rotation of the first exhaust rocker arm assembly causing translation of a corresponding first engine exhaust valve, the first exhaust rocker arm assembly comprising a first rocker arm body having a first capsule assembly configured to move through a first reset function that changes a lift profile of the first engine exhaust valve;
a second exhaust rocker arm assembly rotatable around the exhaust rocker shaft based upon a second lift profile provided on a second cam configured to rotate with the exhaust camshaft, a rotation of the second exhaust rocker arm assembly causing translation of a corresponding second engine exhaust valve, the second exhaust rocker arm assembly comprising a second rocker arm body having a second capsule assembly configured to move through a second reset function that changes a lift profile of the second engine exhaust valve;
and
an intake rocker arm assembly rotatable around an intake rocker shaft based upon a third lift profile provided on a third cam configured to rotate with an intake camshaft, the rotation of the first intake rocker arm assembly causing translation of at least one engine intake valve, the intake rocker arm assembly comprising a third rocker arm body having a third capsule assembly configured to move through a third reset function that changes a lift profile of the at least one engine intake valve,
wherein the first exhaust rocker arm assembly is configured for decompression engine braking, the second exhaust rocker arm assembly is configured for early exhaust valve opening, and the intake rocker arm is configured for one of early intake valve closing or late intake valve closing.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/767,690Filed 17 Oct 2016 · us provisional application
Priority: 15 Oct 2015
Published: US 2018/0298795 A118 Oct 2018
Granted: 2 Jun 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

F01L 13/0031
For optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque: by…
F01L 13/06
Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations: for braking
F02D 13/0269
During engine operation: controlling the valves to perform a Miller-Atkinson cycle
F01L 2013/0089
For optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque: with…