US 6,981,855 B2
Drilling rig having a compact compressor/pump assembly
Jarmo Leppanen, Gainesville, Fla. (US)
Assigned to Sandvik AB, Sandviken (Sweden)
Filed on Sep. 30, 2002, as Appl. No. 10/259,308.
Prior Publication US 2004/0060717 A1, Apr. 01, 2004
Int. Cl. F01C 11/00 (2006.01)
U.S. Cl. 418—201.1 12 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a hydraulic pump for pumping hydraulic fluid for power transmission;
an air compressor lubricated by compressor oil;
a gearbox common to the hydraulic pump and the air compressor and including an intermeshing gear arrangement for transmitting an inputted power to the hydraulic pump and the air compressor, the intermeshing gear arrangement comprising an input gear, a compressor drive gear, and a pump drive gear, the compressor drive gear and the pump drive gear being operatively connected with the input gear within the gearbox; and
a source of the compressor oil;
the gearbox including an oil inlet connected to the source of compressor oil, and an oil outlet, the oil inlet being at a higher pressure than the oil outlet, wherein compressor oil is circulated through the gearbox while inputted power is being transmitted to the gear arrangement.