Patent ID: 7000728

Claim:
A noise-attenuating fluid transfer conduit for a pilot-controlled power steering system of a motor vehicle, the conduit being mountable in a high pressure circuit for connecting an electrically-driven pump (P) to a controlled member (V) which is fed with pressurized fluid from said pump, said conduit comprising five segments, namely, going from the pump: a first rigid end segment of tube (T 1 ) connected to the pump; a first flexible intermediate segment of hose (T 2 ) communicable with said first rigid end segment of tube (T 1 ); a central rigid segment of tube (T 3 ) communicable with said first flexible intermediate segment of hose (T 2 ); a second flexible intermediate segment of hose (T 4 ) communicable with said central rigid segment of tube (T 3 ); and a second rigid end segment of tube (T 5 ) communicable with said second flexible intermediate segment of hose (T 4 ) and connected to the controlled member, the flexible hose segments (T 2 , T 4 ) of the conduit being of a length which is determined as a function of a response time as short as possible associated with the volume of said flexible hose segments (T 2 , T 4 ) expanding when the electrically-driven pump (P) is set into operation, and at least two noise attenuators (A 1 , A 2 ) being housed inside the conduit, wherein the first noise attenuator (A 1 ) is housed in part in the central rigid segment of tube (T 3 ) and in part in the second flexible segment of tube (T 4 ), and wherein the second noise attenuator (A 2 ) is housed in the second rigid end segment of tube (T 5 ).