초록 ▼

A method for making a sound-dampened automotive enclosure, such as an oil pan, having a metal constraining layer, a metal housing layer, and a viscoelastic layer sandwiched therebetween. In a preferred embodiment, the constraining layer and viscoelastic layer are between the housing layer and the di

A method for making a sound-dampened automotive enclosure, such as an oil pan, having a metal constraining layer, a metal housing layer, and a viscoelastic layer sandwiched therebetween. In a preferred embodiment, the constraining layer and viscoelastic layer are between the housing layer and the die while the housing layer is being drawn. This results in a very close and snug fit between the layers, leading to enhanced sound-dampening effectiveness. The article thus produced is also disclosed.

대표청구항 ▼

A method of producing a stamped three-dimensional sound-damped automotive enclosure having a metal housing layer, a metal constraining layer, and a viscoelastic layer disposed therebetween, said method comprising the steps of: a) providing a metal housing layer, a metal constraining layer, and a vis

A method of producing a stamped three-dimensional sound-damped automotive enclosure having a metal housing layer, a metal constraining layer, and a viscoelastic layer disposed therebetween, said method comprising the steps of: a) providing a metal housing layer, a metal constraining layer, and a viscoelastic layer, said metal housing layer having a marginal single layer metal flange portion; b) disposing said metal housing layer, said viscoelastic layer, and said metal constraining layer in press means; c) urging said metal constraining layer into deforming contact with said metal housing layer by said press means while said viscoelastic layer is disposed between said metal constraining layer and said metal housing layer to deform at least a significant portion of at least one of said metal layers into a three-dimensional shape; d) providing from said metal flange portion a single layer metal flange on the enclosure; thereby producing a sound-damped automotive enclosure having a single layer metal flange extending from said metal housing layer, said metal constraining layer and said viscoelastic layer closely conforming to the shape of those portions of the metal housing layer to which they are adjacent, the viscoelastic layer being capable, through effective solid contact with areas of said metal layers, of providing effective sound-dampening of noise associated with the enclosure.