Noise attenuating insulated heat shield

US6581720B1 · kind B1 · utility

Assignee

• DANA LIMITED · US

Inventors

• Colin Chen · Barrington, US
• Mark Boogemans · Belmont, CA
• Calin Matias · London, CA

Key dates

• Filing date: Nov 30, 2001
• Grant date: Jun 24, 2003
• Expiry date: Nov 30, 2021

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01N2450/24
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

An improved heat shield offers both a thermal insulation and reduced noise transmission for vehicular engine components, including exhaust manifolds, for example. The structure has three layers: an outer structural metal layer, a center insulation layer to isolate heat and dampen noise, and an inner metal layer directly adjacent the shielded component for reflecting heat back to the shielded component. As disclosed, the heat shield includes at least one bolt aperture for attachment of the shield to a shielded component, such as an exhaust manifold in the described embodiment. The aperture is circumferentially bordered by at least one non-planar undulation defining a protuberance. The protuberance is spaced circumferentially about the aperture. As the bolted connection of the heat shield to the manifold is a major source of vibration transmittal from the manifold into the shield, the protuberance is effective to dampen the vibration, and hence noise associated with the vibration.