Electrohydraulic stop device
AssigneeSiemens Aktiengesellschaft
InventorsAndreas Kappel, Randolf Mock, Hans Meixner
Life of this patent
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Abstract
A electrohydraulic stop device contains a piezoelectric actuator (P) which acts on two coupled hydraulic stroke transformers having identical transmission ratios. Essential components of the stop device are the pressure piston (DK) driven by the actuator (P), the lifting piston (HK) mounted axially displaceably in a cylindrical bore (ZY) of the pressure piston (DK), and a chamber (KB), into which open inflow and outflow ducts (B2, G2, B3, G3) for the medium to be shut off. By activating the actuator (P), the dumbbell-shaped lifting piston (HK) can be displaced virtually without delay in the pressure piston bore (ZY) and the inflow or outflow ducts (B2, B3) be closed.
Claims17
A stop device, comprising:
- a) a first piston arranged axially displaceably in a first bore of a first housing,
- a1) the first piston and the first bore forming a first and a second housing chamber, and
- a2) the first and the second housing chamber each being filled with a hydraulic medium;
- b) an actuator, which is arranged in one of the first and second housing chambers and an axial length of which can be changed controllably, is connected to act on the first piston;
- c) a dumbbell-shaped second piston is arranged axially displaceably in a second bore of the first piston,
- c1) the dumbbell-shaped second piston acting on a return element arranged in the first housing,
- c2) the second piston and the second bore forming a third chamber filled with the hydraulic medium, and
- c3) the third chamber being connected to the second housing chamber;
- d) the second piston and the second bore form a stop chamber, the stop chamber
- d1) being connected via a first piston duct to a housing inflow and via a second piston duct to a housing outflow, and
- d2) the first and the second piston duct opening into the stop chamber in such a way that the second piston shuts off one of the first and second piston ducts in an event of a length change in the actuator.
A stop device, comprisinga:
- a) a first piston arranged axially displaceably in a first bore of a first housing,
- a1) the first piston and the first bore forming a first and a second housing chamber, and
- a2) the first and the second housing chamber each being filled with a hydraulic medium;
- b) an actuator, which is arranged in one of the first and second housing chambers and an axial length of which can be changed controllably, being connected to act on the first piston;
- c) a dumbbell-shaped second piston is arranged axially displaceably in a second bore of a second housing,
- c1) the second piston and the second bore forming a third and fourth housing chamber each filled with the hydraulic medium, and
- c2) the second piston acting on a return element arranged in the second housing;
- d) the housing chambers being connected to one another in such a way that an axial displacement of the first piston causes a displacement of the second piston;
- e) the second piston and the second bore form a stop chamber;
- f) a housing inflow and a housing outflow open into the stop chamber in such a way that the second piston shuts off the housing inflow or the housing outflow in an event of a length change of the actuator.
Dependencies are inferred from the claim text.