| 摘要 |
A steering servo-system with a reaction force which can be varied according to the speed of the vehicle, possessing between the servo-pump (3) and the container (4) two restrictors (20 or 21 and 22) of which at least one has a throttle cross-section which can be varied as a function of the speed of the vehicle. The two restrictors are connected in series. Two reaction areas are separated from one another by at least one restrictor. A pressure-reducing valve (26) limits the pressure-gradients across the two restrictors, connected one after the other, to a specific valve. For this, the pressure-reducing valve (26) on one side operates, via a control line (27), at the pressure prevailing in front of the restrictors which are connected in series. On the other side, the pressure-reducing valve (26) is actuated by the pressure prevailing behind the restrictors as well as by the force of a spring. With this installation, in the event of a change in the vehicle speed, it is possible to modify not only the hydraulic reaction but also the limitation of the actuation force. |
