Search International and National Patent Collections

1. (WO2017198420) PIEZOHYDRAULIC ACTUATOR

Pub. No.:    WO/2017/198420    International Application No.:    PCT/EP2017/059514
Publication Date: Fri Nov 24 00:59:59 CET 2017 International Filing Date: Sat Apr 22 01:59:59 CEST 2017
IPC: F15B 11/02
F15B 15/08
F15B 15/10
F16K 31/00
F15B 15/18
H02N 2/04
Applicants: SIEMENS AKTIENGESELLSCHAFT
Inventors: BACHMAIER, Georg
VITTORIAS, Iason
ZÖLS, Wolfgang
Title: PIEZOHYDRAULIC ACTUATOR
Abstract:
The invention relates to a piezohydraulic actuator (1) which is formed as a system having four chambers, wherein a first chamber is a drive bellows (3) which is movable by a piezo actuator (5) and which is filled with a hydraulic fluid (7) and which is hydraulically connected by means of a first check valve (RV1) to a second chamber, formed as a hydraulic cylinder (9) filled with the hydraulic fluid (7), as first output (A1), the housing and hydraulic piston (11) of which are coupled mechanically in parallel with respect to an output bellows (13), filled with the hydraulic fluid (7) and forming a third chamber, as second output (A2), wherein the drive bellows is hydraulically connected by means of a second check valve (RV2) to a fourth chamber, filled with the hydraulic fluid (7), as a reservoir (15), wherein said fourth chamber is connected by means of a third check valve (RV3) to the drive bellows (13), and the hydraulic cylinder (9) is hydraulically connected by means of a fourth check valve (RV4) to the output bellows (13).