Gear Box ( customize)

Customize Gear Box for connection Turbine and Generators HOUSING: made of electric welded steel, with a double stress-relieving annealing treatment, after the welding and before the finishing in order to eliminate any residual tension. After the final welding the housings are sand-blasted to SA grade 2 ½ . The housings are machined to a minimum precision grade UNI 5, DIN 5 ( Agma 12) . GEARS: spur double helical type, casehardened, quenched and ground. Hardness: gearwheel: 55 ¸ 58 HRC pinion: 58 ¸ 60 HRC Grinding according to the precision class UNI 5 ( DIN 5 ( AGMA 12) . The gearwheel and the pinion are obtained from forgings; material: 18NiCrMo5. SLOW SHAFT: the slow shaft onto which the gearwheel will be shrunk is made of hardened and tempered steel, type 39NiCrMo3, hardness 210 – 240 HB. FAST SHAFT: integrated with the pinion is will be made of casehardening steel 18 NiCrMo5 BEARINGS: Slow shafts: thrust and radial combined bearings; thrust bearing will be Tapered-Land type. Fast shaft : tilt-pad journal bearings ( no misalignment, vibration and over-heating problems) The bearings are designed and manufactured by CAT. COVERS: the covers at the input and at the output are manufactured in two halves, the seals are mechanical with the possibility of an air flow. Material: aluminium. The covers have holes for the installation of no-contact feelers to detect vibrations. BALANCING: the gears are balanced dynamically according to API 613 standards, the pinion with the half joint ( supplied by the customer) and the gearwheel on the shaft. TEMPERATURE: the bearing temperature is detected by thermoresistances type PT 100 inserted near the white metal in the area with the maximum load. 6 Nos double ( separated) thermo detectors 4 Nos contact thermometers, installed near the bearings. The thermal elements are wired. ACCESSORIES: Barring device installed opposite from the fast shaft and composed of: a.c. motor SSS coupling Worm gearbox GEAR PUMP: driven by the gearbox slow shaft through an oscillating toothed joint. ANY OF THE ABOVE STANDARD CHARACTERISTICS CAN BE VARIED ACCORDING TO SPECIFIC CUSTOMER REQUIREMENTS. TESTS: The no load tests, at the maximum speed, are made in our workshop at the presence of customers’ supervisors, according to the agreed quality control plan. The following checks are usually made during the no load test: • Noise level • Bearing temperature • Vibration control • Check of the correct operation of the instruments • Check of the barring equipment • Check of the driven pump functionality