Vibration damping device
AssigneeSumitomo Riko Company Limited
InventorsMasaaki Hirano, Takashi Kume
Life of this patent
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Abstract
In a vibration damping device applying a magnetic force from a magnetic field generation unit to an orifice path communicating with fluid chambers into which a magnetic functional fluid is filled and controlling vibration damping properties. An intermediate cylindrical member to which an outer cylindrical member formed by a non-magnetic material is externally fit and fixed is formed by a ferromagnetic material. In the intermediate cylindrical member, a magnetic field acting opening part is provided at a position corresponding to the orifice path.
Claims10
A vibration damping device, which is a fluid-filled vibration damping device and comprises:
- a main rubber elastic body;
- an inner shaft member;
- an intermediate cylindrical member, wherein the inner shaft member and the intermediate cylindrical member are linked by the main rubber elastic body;
- an outer cylindrical member, externally inserted and fixed to the intermediate cylindrical member;
- a plurality of fluid chambers, separated in a circumferential direction, formed by covering pocket-like parts provided at the main rubber elastic body and open to an outer circumferential side of the intermediate cylindrical member by using the outer cylindrical member;
- and
- an orifice path, allowing the fluid chambers to communicate with each other,
- wherein a magnetic functional fluid is filled into the fluid chambers,
- a magnetic field generation unit applying a magnetic field to the magnetic functional fluid flowing through the orifice path is provided outside the fluid chambers,
- the outer cylindrical member is formed by a non-magnetic material,
- the intermediate cylindrical member is formed by a ferromagnetic material, and
- in the intermediate cylindrical member, a magnetic field acting opening part is provided at a position corresponding to the orifice path in which the magnetic field is applied to the magnetic functional fluid,
- wherein the intermediate cylindrical member comprises:
- a pair of side portions in an axial direction, configured in a cylindrical shape with a diameter that is continuous in the circumferential direction;
- and
- an intermediate portion in the axial direction, partially provided in the circumferential direction, and having a concave groove shape extending in the circumferential direction between the pair of side portions in the axial direction,
- wherein the magnetic field acting opening part is provided at the intermediate portion in the axial direction, and the magnetic field acting opening part penetrates through the intermediate portion in a radial direction.
Dependencies are inferred from the claim text.