| 摘要 |
PROBLEM TO BE SOLVED: To permit the direct and manual control so that the sense of operator is not lost under conditions where a small load is applied, and servo assisted control under conditions where a large load is applied. SOLUTION: A pressurizing coupling has a predetermined preload force. A spool 26 and a sleeve 22 move relatively when the feedback power becomes larger than this preload. Accordingly, the sleeve 22 moves in synchronized with the spool 26 until the feedback forces becomes larger than the predetermined preload force. Afterwards, the spool 26 and the sleeve 22 interactively move, and generate the control signals for a servo 16 to move movable members. The power input by the operator is supplemented so that the amount of the fluid exclusion in the unit is changed. |
