Electrohydraulic setting device
AssigneeSaab AB
InventorsAnders Malmquist, Peter Kjellquist
Life of this patent
Estimating the term…
Abstract
An actuating device (1) for carrying out mechanical work by means of a slave piston rod (5) in a hydraulically-operated slave cylinder (2), where the actuating device (1) is made up of a hydraulic pump (3) integrated with a slave cylinder (2) and where the hydraulic pump (3) is driven by a linear electric motor. which consists of a pump piston (7) which is used as rotor in the linear motor at the same time as the pump piston (7) functions as a pumping piston in the hydraulic pump (3) to build up a hydraulic pressure in the slave cylinder (2).
Claims10
An actuating device (1) for execution of mechanical work by means of a piston rod (5) in a hydraulically-operated slave cylinder (2), characterised in that the actuating device (1) is made up of a hydraulic pump (3) integrated with a slave cylinder (2), that the hydraulic pump (3) is driven by a linear electric motor, where a pump piston (7) used as a rotor in the linear motor also functions as a pump piston in the hydraulic pump (3) for building up a hydraulic pressure in the slave cylinder (2) and in that the pump piston (7) is rotated a predetermined part of a rotation after every complete pump stroke.
An actuating device (1) as in any of the preceding claims, characterised in that having a stepping motor at each end of the pump cylinder (6) controls the rotation of the piston (7).
Method for executing mechanical work by means of a slave piston rod (5) in a hydraulically-operated slave cylinder (2), where a hydraulic pump (3) is integrated with a slave cylinder (2), characterised in the steps:
- a linear electric motor drives a pump piston (7) in a hydraulic pump (3) to execute strokes in a reciprocating motion,
- the pump piston (7), which at the same time functions as a rotor in the linear motor, also pumps a hydraulic fluid (8) to and from the slave cylinder (2) with every stroke, and
- the pump piston (7) is advanced a predetermined part of a rotation with every stroke.
Dependencies are inferred from the claim text.