| 摘要 |
The electrohydraulic actuating unit has a displaceable part (11) which can be displaced by admission or relief of pressure through control chambers (12, 13) arranged at its two front ends. The pressure control of the control chambers is effected by an electromagnetically operable control valve (14, 15) allocated to each control chamber. A mechanical return means in the form of a compression spring (25, 26) is provided between the displaceable part (11) and the control valves. In accordance with the position of the displaceable part (11), the control valves are set against the force of their electromagnets (27, 28) by preloading of the compression springs. The displaceable part reaches the desired position when the forces are in equilibrium. In this way, a proportionally acting actuating unit with force balance and return for positional control is obtained. <IMAGE> |
