| 摘要 |
A rocker arm assembly comprises a latch member (48) moveable between a first position to provide a first rocker arm assembly configuration and a second position to provide a second rocker arm assembly configuration. The assembly further includes latch actuating means (30) comprising a piston (34) reciprocally arranged in a piston bore (36) and coupled to the latch member (48) for moving the latch member (48) from the first position to the second position. The piston (34) has a pressure surface (42) defining with the piston bore (36) a hydraulic chamber (44), the hydraulic chamber (44) comprising an inlet for a pressurized hydraulic medium so as to move the piston 34() under the action of hydraulic pressure. According to an important aspect of the invention, the hydraulic chamber (44) and piston pressure surface (42) are designed in such a way that, in a first position of the piston (34), only a first area of the pressure surface (42) is exposed to pressurized hydraulic medium and, as from a second position of said piston (34), a second area of the pressure surface (42), larger than the first area, is exposed to pressurized hydraulic medium. <IMAGE>
|
