| 摘要 |
A drive device for closing unit, injection unit or ejectors of a plastics injection molding machine, has a drive element which is axially moveable, and a hydraulic unit which is moveable by the drive element in the same direction as the drive element. The hydraulic unit is a force multiplier with a large piston and a first small piston, which are moveable in relation to one another and differ in size of their effective surface areas. An intermediate part together with the pistons encloses a pressure chamber filled with a pressure fluid. The first small piston is mechanically connected to the drive element. A second small piston with the intermediate part define a fluid chamber connected by a valve, in one embodiment, to the pressure chamber. The hydraulic unit as a whole is moveable for the positioning movement and the intermediate part is blockable against displacement in relation to a fixed frame.
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