公开(公告)号：CA2730409C

公开(公告)日：2016-06-07

申请号：CA2730409

申请日：2011-01-28

Applicant: BAKER HUGHES INC

Inventor： CURRY DAVID A ,  KOLTERMANN TERRY J ,  LIN CHIH C ,  HALL STUART

IPC: E21B10/25

Abstract: An earth boring bit has a bit body with a depending bearing pin, a cone rotatably mounted on the bearing 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 deformable 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.

公开(公告)号：CA2730409A1

公开(公告)日：2011-08-03

申请号：CA2730409

申请日：2011-01-28

Applicant: BAKER HUGHES INC

Inventor： CURRY DAVID A ,  KOLTERMANN TERRY J ,  LIN CHIH C ,  HALL STUART

IPC: E21B10/25

Abstract: An earth boring bit has a bit body with a depending bearing pin, a cone rotatably mounted on the bearing 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 deformable 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.