| 摘要 |
A control unit regulates the drive speed of each drive unit (2-5) and produces at least two signals proportional to one another. The servo devices (10,11) that regulate fluid flow to the drive units are designed (and/or the pumps are designed) so that the drive speed of one drive unit when one of the signals controlling this drive until falls is made proportional to the drive speed that this unit would have in the absence of failure. Each drive unit has at least two hydraulic pumps each with a servo device. The pumps are parallel. Each signal controls one servo device. |
