Patent ID: 7415954

Claim:
A rocker shaft arrangement for a valvetrain system of an engine, the rocker shaft arrangement comprising: a split rocker shaft including: two fluidly separate internal regions, each internal region arranged to selectively carry an independent supply of pressurized oil for distribution to valvetrain components; a hollow center and a divider positioned in the hollow center, the divider arranged to divide the hollow center into the two fluidly separate internal regions; a first bore positioned in the split rocker shaft and arranged to intersect one of the two fluidly separate internal regions of the split rocker shaft, the first bore arranged to align with an oil feed input channel for a low lift rocker arm, wherein the one of the two fluidly separate internal regions is arranged to selectively carry a supply of pressurized oil for distribution to the low lift rocker arm through the first bore and the low lift rocker arm oil feed input channel for selective actuation of a low lift rocker arm engagement mechanism; and a second bore positioned in the split rocker shaft and arranged to intersect another of the two fluidly separate regions of the split rocker shaft, the second bore arranged to align with an oil feed input channel for a high lift rocker arm, wherein the other of the two fluidly separate internal regions is arranged to selectively carry a supply of pressurized oil for distribution to the high lift rocker arm through the second bore and the high lift rocker arm oil feed input channel for selective engagement of a high lift rocker arm engagement mechanism.