Noise reducing fluid transfer hose, in particular for a motor vehicle power steering controlled system
AssigneeHutchinson
InventorPhilippe Drouet
Life of this patent
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Abstract
A noise-attenuating fluid transfer conduit, in particular for a pilot-controlled power steering system of a motor vehicle, the conduit being mounted in a high pressure circuit for connecting an electrically-driven pump to a controlled member which is fed with pressurized fluid from said pump, said conduit being made up of alternating segments of rigid tube and segments of flexible hose, and at least one noise attenuator housed inside the conduit, wherein the flexible hose segments of the conduit are of a length which is determined as a function of as short as possible a response time associated with their volume expanding when the electrically-driven pump is set into operation.
Claims10
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 (T1) connected to the pump;
- a first flexible intermediate segment of hose (T2) communicable with said first rigid end segment of tube (T1);
- a central rigid segment of tube (T3) communicable with said first flexible intermediate segment of hose (T2);
- a second flexible intermediate segment of hose (T4) communicable with said central rigid segment of tube (T3);
- and
- a second rigid end segment of tube (T5) communicable with said second flexible intermediate segment of hose (T4) and connected to the controlled member, the flexible hose segments (T2, T4) 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 (T2, T4) expanding when the electrically-driven pump (P) is set into operation, and at least two noise attenuators (A1, A2) being housed inside the conduit, wherein the first noise attenuator (A1) is housed in part in the central rigid segment of tube (T3) and in part in the second flexible segment of tube (T4), and wherein the second noise attenuator (A2) is housed in the second rigid end segment of tube (T5).
Dependencies are inferred from the claim text.