| 主权项 |
1. A compression brake including:
a rocker arm pivotable about a rocker arm shaft to selectively force an exhaust valve to an open condition, the rocker arm having a lower position, an upper position, and a plurality of positions intermediate the lower and upper positions; a lash member coupled to the rocker arm, the lash member being configurable to define a plurality of positions relative to the rocker arm, the lash member having a first position that forces opening of the valve when the rocker arm is at the lower position, and a lost motion cylinder at least partially defined within the rocker arm, the cylinder biased towards a position of greatest internal displacement volume, the lost motion cylinder having a first operational mode wherein the lost motion cylinder permits compression thereof such that the ability of the rocker arm to open an exhaust valve is a function of the position of the lash member, the lost motion cylinder having a second operational mode wherein the lost motion cylinder retards compression thereof such that the ability of the rocker arm to open an exhaust valve is independent of the position of the lash member. |
