Sealed thin-multi-layer sound absorber

US7677358B2 · kind B2 · utility

Assignee

• Rieter Technologies AG · CH

Inventors

• Gabriele Tocchi · Sesto San Giovanni, IT
• Phillippe Pierre Godano · Winterthur, CH
• Bertrand DELMAS · Les Mureaux, FR
• Jan Horak · Winterthur, CH
• Tommy Falk · Bromma, SE
• Karim Bouteraa · Jambville, FR
• Alexander Wildhaber · Walenstadt, CH

Key dates

• Filing date: Apr 4, 2006
• Grant date: Mar 16, 2010
• Expiry date: Apr 4, 2026

Classification

• Technology area (CPC G): Physics
• CPC primary: G10K11/168
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a thin sound absorbing multi-layer assembly, which is intended, in particular, to reduce interior or exterior noise of a motor vehicle. The assembly according to the invention comprises at least three stacked layers consisting respectively of: a first layer (4) being impervious and having an area weight of between (20) to (100 g/m2); a second layer (3) having an air flow resistance of between (250) to (2500 Ns/m3) and an area weight of between (15) to (250 g/m2); a third layer (2) being an open pored, acoustic spring type layer having a thickness of between (2) to (30 mm) and an area weight of between (50) to (1000 g/m2).