Patent ID: 7950913
Filing Date: 2011-05-31
Classification: F01C

Abstract:
1. A seal system comprising: a first member disposed on one side and a second member disposed on another side, which members face each other, and at least one of which performs a sliding motion; an annular groove provided on a slide surface of the second member, the slide surface being a surface with which the second member slides on the first member; and an annular seal member fittedly inserted in the groove and having a surface used as a slide surface; wherein, the slide surface of the seal member contacts a slide surface of the first member on their flat surfaces; a high pressure side and a low pressure side are defined, said high pressure side being disposed on an inner or outer peripheral side of said seal member and said low pressure side being disposed on a side opposite the high pressure side of said seal member; a leak preventer for preventing a pressure of the high pressure side from leaking into the low pressure side is disposed between the seal member and the groove; the leak preventer, a bottom portion side of the groove and the seal member define a backpressure chamber that is in communication with the high pressure side; and when the seal member is in operation, a contact area of the slide surface of the seal member with the first member is large compared to an effective area of the backpressure side of the seal member which pushes the seal member toward the first member, which effective area is defined as a difference between an area of the seal member on the slide surface side, on which a pressure from the high pressure side acts, and an area of the seal member on a side of said second member, on which a pressure from the high pressure side acts.