Patent · US Expired

Electrohydraulic stop device

US5857662A · kind A · utility

5Cited by

4References

17Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Andreas Kappel · Höhenkirchen-Siegertsbrunn, DE
Randolf Mock · Munich, DE
Hans Meixner · Haar, DE

Key dates

Filing date	Oct 15, 1996
Grant date	Jan 12, 1999
Priority date	—
Expiry date	Oct 15, 2016

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/86622
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.