Active vibrational damper
AssigneeDayco Products, Inc.
InventorRobert J. Crist
Life of this patent
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Abstract
A vibration damper and/or isolator for a rotating shaft is provided comprising a hub, an inertia element, a magneto-rheological elastic element interposed between the hub and the inertia element to non-rigidly couple the inertia element to the hub, and an electromagnet operable to produce a magnetic field across the elastic element when energized. The magneto-rheological elastic element, which may comprise a composite of magnetic-responsive particles dispersed within an elastic material, possesses a variable shear modulus that is dependent, at least in part, on the strength of a magnetic field applied to the elastic element.
Claims22
A vibration damper comprising:
- a vibrating element coupled to a rotating shaft for rotational movement therewith;
- an annular inertia element having an axially extending slot in an outer face thereof;
- a magneto-rheological elastic element interposed between the inertia element and the vibrating element;
- and
- an electromagnet operable to produce a magnetic field across the elastic element when energized;
- wherein the inertia element is elastically coupled to the vibrating element by the magneto-rheological elastic element;
- and
- wherein at least one of a portion of the electromagnet, a portion of the magneto-rheological elastic element, or a portion of the vibrating element is located within the slot in the annular inertia element.
A vibration damper comprising:
- a hub adapted to be coupled to an associated rotating shaft for rotational movement therewith;
- an inertia element having a an axially extending slot in an outer face thereof;
- a magneto-rheological elastic element interposed between the hub and the inertia element to non-rigidly couple the inertia element to the hub for rotation therewith;
- a fluid chamber defined by the slot in the inertia element, the hub, and the magneto-rheological elastic element, the fluid chamber containing a magneto-rheological fluid;
- and
- an electromagnet operable to produce a magnetic field across the magneto-rheological elastic element and the magneto-rheological fluid.
Dependencies are inferred from the claim text.