Miguel Angel Ramirez

Address:

2422 Harlandale Ave, Dallas, TX 75216

Phone:

(214)3766407

VIN:

1GNFC13J87R191451

Make:

CHEVROLET

Model:

TAHOE

Year:

2007

Address:

3131 Royal Ln, Dallas, TX 75229

VIN:

5TEJU62N47Z374948

Make:

TOYOTA

Model:

TACOMA

Year:

2007

US Patent:

20120160561, Jun 28, 2012

Filed:

Dec 22, 2010

Appl. No.:

12/976789

Inventors:

Miguel Angel Ramirez Santiago - Carrollton TX, US

Assignee:

Varel International - Carrollton TX

International Classification:

E21B 7/00
E21B 10/00

US Classification:

175 57, 175371

Abstract:

A drill tool includes a bit body, at least one bearing shaft extending from the bit body, and a cone mounted for rotation on the bearing shaft. A first sealing system includes a first annular seal gland formed in a cylindrical surface of the cone and a seal ring retained within the first annular seal gland and compressed against a cylindrical surface of the bearing shaft. A second sealing system includes a second annular seal gland formed in a radial surface of the cone and a Belleville spring retained within the second annular seal gland and compressed against a radial surface surrounding the bearing shaft. A set of non-pressure compensated lubrication channels are configured to supply lubricant to an interstitial volume defined between the cone and bearing shaft, the lubricant retained within the interstitial volume by the first and second sealing systems, the lubrication channels further supporting open air circulation through the bearing when the sealing systems fail and lubricant is lost.