Patent ID: 7681889
Filing Date: 2010-03-23
Classification: F16J

Abstract:
1. A floating seal device for effecting a seal between relatively rotating one component and the other component, said floating seal device comprising: (a) a first seal ring having a first seal surface on one end of said first seal ring in an axial direction a first back surface on another end of said first seal ring in the axial direction, a diameter surface, and a first press urging surface being formed on an outer circumference of said diameter surface of said first seal ring; (b) a first seal retainer having a first inner circumferential fixing surface, said first inner circumferential fixing surface facing said first press urging surface in an opposing manner; (c) a first resilient seal ring disposed between and in seal tight contact with said first press urging surface and said first inner circumferential fixing surface, said first resilient seal ring exerting a resilient urging force against the first press urging surface in the axial direction; (d) a second seal ring having a second seal surface on one end of said second seal ring in the axial direction, a second back surface on another end of said second seal ring in the axial direction, a diameter surface wherein said second seal surface is in seal tight contact with said first seal surface on said first seal ring and is slidable relative to said first seal surface, and a second press urging surface formed on an outer circumference of said diameter surface of said second seal ring; (e) a second seal retainer having a second inner circumferential fixing surface facing said second press urging surface; and (f) a second resilient seal ring disposed between and being in seal tight contact with said second press urging surface and said second inner circumferential fixing surface, said second resilient seal ring exerting a resilient urging force against the second press urging surface in the axial direction; wherein said first press urging surface comprises a first tapered surface, a first circular arc surface, and a second circular surface, said first tapered surface being configured wherein a diameter thereof increases in a direction approaching the first seal surface, said first circular arc surface and said second circular are surface being formed at both ends of the first tapered surface, said first circular arc surface being located toward the first seal surface side, and said second circular arc surface being located toward said first back surface side, and wherein said first press urging surface is formed to have a dimensional ratio defined by and equation of H/L≦0.5 wherein H is a radial width, which extends from a tapered surface starting point P formed at said first back surface side of said first tapered surface to an end tip point P′ of said first press urging surface formed at the outer diameter surface of said first seal ring in said first circular arc surface, and L is an axial length, which extends from said tapered surface starting point P of said first tapered surface to said end tip point P′ of said first press urging surface.