Valve device
AssigneeMikuni Corporation
InventorsToshiaki Ishii, Makoto Koyama, Daisuke Takayama
Life of this patent
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Abstract
A valve device includes a body that defines a passage through which a fluid flows, a shaft that is movably supported with respect to the body and defines an axis, a valve element that is fixed to the shaft to open and close the passage; and a cylindrical bearing bush that movably supports the shaft with respect to the body, in which the bearing bush includes a mixed region in which a metal core material and expanded graphite are mixed with each other, and a first expanded graphite region made of only the expanded graphite such that the metal core material is not exposed in an inner circumferential side region in contact with an outer circumferential surface of the shaft.
Claims8
A valve device, comprising:
- a body that defines a passage through which a fluid flows;
- a shaft that is movably supported with respect to the body and defines an axis;
- a valve element that is fixed to the shaft to open and close the passage;
- and
- a cylindrical bearing bush that movably supports the shaft with respect to the body,
- wherein the cylindrical bearing bush includes a mixed region in which a metal core material and expanded graphite are mixed with each other, and a first expanded graphite region in which only the expanded graphite exists such that the metal core material is not exposed in an inner circumferential side region in contact with an outer circumferential surface of the shaft,
- in the first expanded graphite region, a layer thickness dimension in a diameter direction perpendicular to the axis from an inner circumferential surface of the cylindrical bearing bush is in a range of 0.05 mm to 0.2 mm.
Dependencies are inferred from the claim text.