Composite Metallic Elastomeric Sealing Components for Roller Cone Drill Bits

摘要

An earth boring bit has a bit body with a depending bearing pin, a eons rotatably mounted on the hearing pin, a seal gland between the cone and the bearing pin, and a seal assembly located in the seal gland. The seal assembly includes an annular metallic spring encircling the bearing pin. The spring has a geometric center line that extends in a circle around the bearing pin. The spring is elastically deform able in radial directions relative to the center line. An elastomeric layer is located on an exterior side of the spring and is biased by the spring against a surface of the seal gland.

主权项

1. A downhole well tool having an inner member located within an enter member, one of the members being rotatable relative to the other of the members, an annular seal gland located between the members, and a seal assembly located in the seal gland, comprising:
a seal ring having a solid core formed of an elastornerie material; and an annular metallic spring felly embedded within the elastornerie material of the seal ring, the spring having a geometric center line that extends in a circle around the inner member, the spring being elastically deformable such that when the seal ring is installed in the seal gland, the spring will exert oppositely directed forces along radial lines from the center line.