| 摘要 |
The invention relates to a drive device, which is used in particular for the locking unit, the injection unit, or the ejector of an injection-moulding machine for plastics and which has a drive element that can be axially displaced by an electromotor and a hydraulic unit that can be displaced in the same direction as the drive element by being entrained by the latter. The hydraulic unit is a power-transmission element comprising two pistons which can be displaced in relation to one another and have working surfaces of different dimensions. Said hydraulic unit is also an intermediate element, which together with the pistons encloses a pressure chamber that is filled with a hydraulic fluid, when the small piston with the smaller working surface is mechanically connected to the drive element, when the entire hydraulic unit is displaced for a control movement and when the intermediate element is locked to prevent it from being displaced in relation to a fixed frame, in order to enable the larger piston with the larger working surface to exert a great force.
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