Abstract: An improved heat shield provides for reduced noise transmission of vehicular engine components is disclosed. The heat shield has three layers; a first sheet layer, a center insulation layer, and a second sheet layer. The insulation layer is positioned between the first and second sheet layers. The first sheet layer is defined by a variable shaped periphery that is folded over the periphery of the second sheet layer to form a hem having a variable length around the heat shield. The variable length serves to reduce uneven strain in the hem area experienced during crush forming the heat shield into the final shape. Further, the variable length of the hem also serves to alter the resonate frequency of the heat shield in specific areas to reduce vibration and improve acoustical properties.

Abstract: A heat shield includes an inner portion, an outer portion, first and second insulating portions, and a deflecting portion. The inner portion includes a reflective material to reflect thermal energy that radiates from a heat/acoustic source. The outer portion includes a rigid material to provide structural support for the heat shield. The first and second insulating portions are intermediately positioned between the inner and outer portions. The deflecting portion is intermediately positioned between the first and second insulating portions to deflect acoustics from the heat/acoustic source. A method for manufacturing the heat shield is also disclosed.

Abstract: A heat shield includes an inner portion, an outer portion, first and second insulating portions, and a deflecting portion. The inner portion includes a reflective material to reflect thermal energy that radiates from a heat/acoustic source. The outer portion includes a rigid material to provide structural support for the heat shield. The first and second insulating portions are intermediately positioned between the inner and outer portions. The deflecting portion is intermediately positioned between the first and second insulating portions to deflect acoustics from the heat/acoustic source. A method for manufacturing the heat shield is also disclosed.

Abstract: An improved heat shield provides thermal insulation and reduced noise transmission of vehicular engine components, including exhaust manifolds. 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. The heat shield is attached by bolts to the shielded component. In the described embodiment, the volume of the insulation layer is expanded by approximately 15 to 20 percent over conventional shields to produce a softer, thicker material having a lower density but unchanged mass. The invention provides a technique to achieve desired thickness and density in insulation layers via modal finite element analysis. The relatively thicker heat shield more effectively absorbs vibration and attenuates noise without increase in mass. In the described embodiment, the layer contains cellulose, diatomaceous earth, talc, and fiberglass.

Abstract: A heat shield provides thermal insulation and reduced noise transmission for under-the-hood vehicular engine components, such as exhaust manifolds. The structure is formed in three layers: an outer metal layer to provide structural integrity, 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 insulation layer is sandwiched between the two metal layers. The heat shield is formed in two integral mating halves to define a unitary structure containing grommets. The grommets incorporate capscrews rotatably secured in respective halves of the structure for attachment to mounting bosses on the component. Finally, the edges of the two metal layers of the heat shield are folded over to prevent injury to installers, and to reinforce the heat shield structure for enhancing its useful life under severe conditions of vibration and heat.

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.

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.

Abstract: A heat shield provides thermal insulation and reduced noise transmission for under-the-hood vehicular engine components, such as exhaust manifolds. The structure is formed in three layers: an outer metal layer to provide structural integrity, 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 insulation layer is sandwiched between the two metal layers. The heat shield is formed in two integral mating halves to define a unitary structure containing grommets. The grommets incorporate capscrews rotatably secured in respective halves of the structure for attachment to mounting bosses on the component. Finally, the edges of the two metal layers of the heat shield are folded over to prevent injury to installers, and to reinforce the heat shield structure for enhancing its useful life under severe conditions of vibration and heat.