초록 ▼

A convoluted conduit is especially well adapted for use in hostile environments subject to vibrations which bring on fatigue failures. To prevent the conduit from having a uniform resonance throughout its length, the convolutions have a variable wall thickness. One way this variable wall thickness m

A convoluted conduit is especially well adapted for use in hostile environments subject to vibrations which bring on fatigue failures. To prevent the conduit from having a uniform resonance throughout its length, the convolutions have a variable wall thickness. One way this variable wall thickness may be achieved is by forming the conduit walls by wrapping tape in successive layers to form a multiple layered wall. The width of the tape may be such that each alternate convolution has more layers than its two adjacent neighboring convolutions. Another way of making the conduit is to provide a plurality of coaxially nesting tubes which cooperate to form a wall thickness. Brazing or packing material may be positioned between adjacent layers of tape to seal the conduit and to make the wall behave at that point as a single layer.

대표청구항 ▼

A metallic convoluted fluid conveying conduit for use in an exhaust system of an automotive vehicle, said vehicle causing certain vibrational characteristics which would tend to establish localized high energy loops and nodes in said conduit at various resonant frequencies resulting from an operatio

A metallic convoluted fluid conveying conduit for use in an exhaust system of an automotive vehicle, said vehicle causing certain vibrational characteristics which would tend to establish localized high energy loops and nodes in said conduit at various resonant frequencies resulting from an operation of said vehicle, said conduit comprising a plurality of coaxial layers forming a multi-layered convoluted wall of alternating peaks and valleys, the conduit having a mass and a spring rate which determines the nature of the conduit response to said vibrational characteristics, the layers being arranged to provide a conduit wall comprised of successive incremental lengths, each incremental length of said wall having a thickness which is variable relative to the thickness of neighboring incremental lengths in order to vary said mass and said spring rate to produce localized vibration response characteristics which do not coincide with said localized high energy loops and nodes, whereby successive incremental areas of said conduit have different resonant characteristics responsive to said certain vibrations, and said variations in thickness being distributed along the length of said conduit to inhibit localized resonance in said conduit at said resonant frequencies of said vehicle.