Flexible turbocharger air duct with constricting rings

Abstract

A turbocharger system includes a flexible duct having an elongated elastomeric body extending longitudinally between first and second ends configured to attach to respective turbocharger devices. A plurality of constricting rings are spaced longitudinally between the ends. Each constricting ring applies a radial compression force around a respective circumference of the duct. Each ring is comprised of a molded thermoplastic retained in a concentric shape by a clasp. The spacing of the constricting rings has a density sufficient to limit a volume increase of the duct under turbocharger operating pressure to less than 20%. Each constricting ring has an inner surface including an intrusion feature providing a reduced compression force on the duct so that a portion of the duct enters the intrusion feature, thereby anchoring the constricting ring in a substantially fixed position.

What is claimed is: 
     
         1 . A turbocharger air-transfer system comprising:
 a flexible duct having an elongated elastomeric body extending longitudinally between first and second ends configured to attach to respective turbocharger devices; and   a plurality of constricting rings spaced longitudinally between the ends, each constricting ring applying a radial compression force around a respective circumference of the duct, wherein each ring is comprised of a molded thermoplastic being retained in a concentric shape by a clasp, wherein the spacing of the constricting rings has a density sufficient to limit a volume increase of the duct under turbocharger operating pressure to less than 20%, and wherein each constricting ring has an inner surface including an intrusion feature providing a reduced compression force on the duct so that a portion of the duct enters the intrusion feature, thereby anchoring the constricting ring in a substantially fixed position.   
     
     
         2 . The system of  claim 1  wherein the intrusion feature includes interior pockets spaced around the inner surface. 
     
     
         3 . The system of  claim 1  wherein the intrusion feature includes a substantially cylindrical groove sunk into the inner surface. 
     
     
         4 . The system of  claim 1  further comprising:
 a linking rib extending longitudinally between and connected to adjacent constricting rings to generally maintain spacing between the constricting rings. 
 
     
     
         5 . The system of  claim 4  wherein the linking rib is integrally molded with the adjacent constricting rings from the same molded thermoplastic. 
     
     
         6 . The system of  claim 5  wherein the linking rib is substantially straight and is oriented substantially perpendicular to the adjacent constricting rings. 
     
     
         7 . The system of  claim 5  wherein the linking rib follows a serpentine path substantially along an outer surface of the duct. 
     
     
         8 . The system of  claim 4  wherein the linking rib is comprised of a substantially planar strap having longitudinally spaced apertures, and wherein the adjacent constricting rings each include at least one outwardly projecting nub received in a respective aperture. 
     
     
         9 . The system of  claim 1  wherein the spacing of the constricting rings has a density sufficient to limit the volume increase of the duct under turbocharger operating pressure to less than 10%. 
     
     
         10 . A turbocharger air-transfer system comprising:
 an elastomeric duct extending longitudinally between respective turbocharger devices; and   a plurality of molded thermoplastic constricting rings each applying a radial compression force to the duct and each retained in a concentric shape by a clasp, wherein spacing of the constricting rings has a density sufficient to limit a duct volume increase under turbocharger operating pressure to 20%, wherein each constricting ring has an inner surface including an intrusion feature providing a reduced compression force on the duct so that a portion of the duct enters the intrusion feature, thereby anchoring the constricting ring in a substantially fixed position.   
     
     
         11 . The system of  claim 10  further comprising:
 a linking rib extending longitudinally between and connected to adjacent constricting rings to generally maintain spacing between the constricting rings. 
 
     
     
         12 . The system of  claim 11  wherein the linking rib is integrally molded with the adjacent constricting rings from the same molded thermoplastic, and wherein the linking rib is substantially straight and is oriented substantially perpendicular to the adjacent constricting rings. 
     
     
         13 . The system of  claim 11  wherein the linking rib is integrally molded with the adjacent constricting rings from the same molded thermoplastic, and wherein the linking rib follows a serpentine path substantially along an outer surface of the duct. 
     
     
         14 . The system of  claim 11  wherein the linking rib is comprised of a substantially planar strap having longitudinally spaced apertures, and wherein the adjacent constricting rings each include at least one outwardly projecting nub received in a respective aperture.