The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 26, 2008
Filed:
Jun. 15, 2001
Andrew Mcpherson Downie, Fife, GB;
Guido Ernesto Pezzani, Clackmannanshire, GB;
Andrew McPherson Downie, Fife, GB;
Guido Ernesto Pezzani, Clackmannanshire, GB;
Smith International, Inc., Houston, TX (US);
Abstract
The invention relates to a drive system, in particular a downhole drilling assembly (). In the preferred embodiment, a bearing mechanism () of the assembly () is isolated from a gear mechanism () of the assembly (), to prevent failure of the bearing mechanism () due to vibration and heat generated by the gear mechanism () in use. A lower bearing unit () of the bearing mechanism () is coupled to the gear mechanism () by a shock eliminating coupling assembly (), which prevents the transmission of shock loads to the gear mechanism (). Also, the gear mechanism () is coupled through a shock eliminating coupling assembly () to a turbine () and thus to an upper bearing unit (). Sealing assemblies () are provided for the gear mechanism () and the upper bearing unit () to prevent drilling fluid ingress and consequent damage. The assembly () may also carry a torsionally flexible drive shaft ().