FAIL-SAFE ACTUATION SYSTEM

摘要

A fail-safe actuation system comprising an actuator having first and second chambers, a working circuit with a motor/pump device configured to actuate the actuator in an operative state, and a safety circuit configured to move the actuator into the safety position in a failure state, the safety circuit having a tank that holds pressurized fluid and that, in the failure state, is automatically connected to the first chamber via a switching valve, and having a drain valve that, in the failure state, is moved into a through-flow position in order to drain fluid out of the second chamber, the safety circuit configured such that, in the operative state, an inflow into the actuator—in a manner that is decoupled from the tank—is established by the working circuit, and, in the failure state, an inflow from the tank into the first chamber—in a manner that is completely decoupled from the working circuit—is created by the safety circuit, whereby a short-circuit fluid connection is provided between the first and second chambers that, in the failure state, is through-connected in order to generate a short-circuit flow between the first and second chambers.

主权项

1. A fluid-based actuation system having a safety position comprising:
an actuator having a first chamber and a second chamber; a working circuit having a motor/pump device and configured and arranged to, in an operative state, actuate the actuator; a safety circuit configured and arranged to, in a failure state, move the actuator into the safety position; the safety circuit having a tank that holds pressurized fluid and, in the failure state, is configured and arranged to automatically connect to the first chamber via a switching valve; the safety circuit having a drain valve that has a through-flow position and, in the failure state, is configured and arranged to drain fluid out of the second chamber; the safety circuit configured and arranged such that, in the operative state, the working circuit with its motor/pump device provides an inflow into the actuator, in a manner that is decoupled from the tank; the safety circuit configured and arranged to provide, in the failure state, an inflow from the tank into the first chamber, in a manner that is completely decoupled from the working circuit with its motor/pump device; a short-circuit fluid connection between the first and second chambers; the short-circuit fluid connection configured and arranged to provide, in the failure state, a through-connection between the first and second chambers; and wherein a short-circuit flow is provided between the first and second chambers in the failure state.