Energy attenuation restrictor device and method of forming such restrictor device
AssigneeDayco Products, Inc.
InventorsJayanta Bhattacharyya, Terence E. Skiba
Life of this patent
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Abstract
An energy attenuation restrictor device for use in an energy attenuation apparatus for a conduit adapted to convey a liquid under pressure, particularly, in the power steering system of a vehicle wherein said energy attenuation restrictor device includes a tuning cable composed of a first organic polymer and a fitting member composed of a second organic polymer, and a method for molding the energy attenuation restrictor device are described.
Claims32
An energy attenuation restrictor device for use in an energy attenuation apparatus adapted to convey a liquid under pressure for the attenuation of pressure pulsations in the liquid, comprising:
- a tuning cable composed of an organic polymer, said tuning cable comprising a tubular wall structure having an inner surface and an outer surface, and
- a fitting member composed of an organic polymer, said fitting member comprising a tubular wall structure having an inner surface and an outer surface wherein said fitting member is disposed on one end of said tuning cable such that an inner surface of fitting member is adjacent to or continuous with said outer surface of said tuning cable, said tuning cable and said fitting member being fabricated from an organic polymer possessing characteristics such that said device is compatible with the environment in which it is employed.
An energy attenuation restrictor device for use in an energy attenuation apparatus for the attenuation of pressure pulsations in the liquid in a power steering system of a vehicle wherein the energy attenuation restrictor device is molded in an injection molding apparatus as a unitary structure, comprising:
- a tuning cable composed of a nylon or a glass filled nylon, said tuning cable comprising a tubular wall structure having an inner surface and an outer surface, and
- a fitting member composed of a nylon or a glass filled nylon, said fitting member comprising a tubular wall structure having an inner surface and an outer surface, said outer surface of said fitting member further including a plurality of ridges thereon to improve structural strength of said fitting member and enhance pull-off resistance of said fitting member from a hose in which said energy attenuation restrictor device is fitted, said fitting member being disposed on one end of said tuning cable such that an inner surface of fitting member is adjacent to or continuous with said outer surface of said tuning cable.
A method for manufacturing an energy attenuation restrictor device containing a polymeric tuning cable and a polymeric fitting member, wherein said restrictor device is used in an energy attenuation apparatus for the attenuation of pressure pulsations in the liquid employed in a power steering system in a vehicle, comprising:
- selecting a first polymeric material for use in constructing said tuning cable, said first polymeric material having characteristics such that the tuning cable fabricated therefrom is compatible with an environment in which said tuning cable is employed;
- molding said tuning cable in an injection molding machine;
- selecting a second polymeric material for use in constructing said fitting member, said second polymeric material having characteristics such that the tuning cable fabricated therefrom is compatible with an environment in which said tuning cable is employed;
- and
- molding said fitting member from said second polymeric material in an injection molding machine.
In restrictor device for use in an energy attenuation apparatus in a conduit adapted to convey a liquid under pressure for the attenuation of pressure pulsations in the liquid employed in a power steering system in a vehicle wherein said restrictor contains a tuning cable, a fitting member and a metal support member for providing structural stability and strength to said restrictor device, the improvement of which comprises forming a unitarily formed energy attenuation restrictor device having polymeric tuning cable and a polymeric fitting member, said polymeric fitting member having a plurality of annular ridges formed on the outer surface thereof to improve structural strength of said fitting member and to provide enhanced pull off resistance to said restrictor device wherein said polymeric tuning cable and said polymeric fitting member are formed from the same or compatible polymeric materials having the same or similar melting points, said polymeric tuning cable and said polymeric fitting member being molded simultaneously in an injection molding machine to form a molded unitary energy attenuation restrictor device.
Dependencies are inferred from the claim text.