| 摘要 |
FIELD: machine building.SUBSTANCE: group of inventions relates to the bearing of the downhole tool, and to their cooling methods. The downhole tool bearing contains a first bearing element, having external contact surface determining outside diameter, and a second bearing element giving internal contact surface determining the internal diameter, wherein the ID of the second bearing element is larger OD of the first bearing element, and the internal contact surface of the second bearing element has a slide contact with the external contact surface of the first bearing element at the contact border. The first bearing element has a channel formed in the external contact surface of the first bearing element, and having recess creating flat surface breaking for the rest the round shape of the cross-section of the external contact surface. The second bearing element has at least another channel formed in the internal contact surface of the second bearing element.EFFECT: effective cooling of the bearing, and particles removal.13 cl, 9 dwg |
