ou
amortisseurs magnéto-hydrauliques
selon l'usage précis.

A vrai dire cette technologie étant très récente, il n'existe pas encore à ma connaissance de traduction officielle. Celle que je vous propose est une pure suggestion de ma part.

Toutefois, je suis pratiquement certain qu'il s'agit d'un nouveau type de support permettant d'amortir les vibrations beaucoup mieux que ne le fait un "silent bloc".

Voici un site qui vous donnera des indications précises:

http://www.lpa.uni-saarland.de/englisch/kooperation_eng.htm

"To solve these contradictory requirements a hydro mount was developed that went into full-scale production for the first time in 1997. Within the framework of the research project ALAS (Contract Reference 03N3105) funded by BMBF (Federal Ministry of Education and Research) initiated by Professor Janocha, a completely new generation of hydro mount is being developed now: the MRF hydro bearing is an innovative and flexibe electrically controllable motor mount system for the automobile sector. The main feature of this novel mount is a new magnetorheological (MR) fluid acting as a hydraulic fluid. This fluid contains small magnetisable particles. The mount stiffness can be varied continuously over a wide frequency range by applying controllable magnetic fields to the fluid. Due to the high speed of reaction of the MR fluid, MR fluid hydro mounts can adapt to fast changing operating conditions. In particular, also due to the increasing electrification of automobiles..."