| 摘要 |
The hydraulic drive system has a force storage and a pump delivering the hydraulic liquid for charging the force storage, formed by a known spring force storage with a charge piston and a pressure piston, actuating the hydraulic liquid, as in 1540526. The spring force storage (9) has two springs (18A, 18B) of different force, which are charged by a common piston (25). These springs are effective during different parts of the pressure piston stroke. Preferably the effective stroke of the stronger spring (18A) is limited by a stop (24) on the first part of the pressure piston stroke. The effective stroke of the stronger spring may be smaller than that of the weaker one (18B). |
