| 摘要 |
<p>Apparatus, and an accompanying method for use therein, that utilizes first (working) and second (stopping) servo-controlled hydraulic pistons (310, 313; 401, 413) wherein the stopping piston acts as a controlled mechanical stop for the working piston. Both pistons are spaced apart along and coaxially arranged around a common shaft (312; 412), with each piston moving in a separate cylinder (308, 317; 408, 417). The working piston is securely attached to the shaft, while the shaft moves through a central, longitudinal bore (350; 450) of the stopping piston. The stopping piston effectively 'floats' in its cylinder and produces a greater force that the working piston. A radially extending stop element (321; 421), situated on the shaft, has a surface (322; 422) configured to abuttingly engage with a complementary surface (323; 423) on the stopping piston such that the stopping piston, once appropriately positioned, controllably stops continued movement of the working piston in a very short time and over a very short distance with little strain induced in the apparatus.</p> |
