Elecon have developed main drive speed reducers for air pre-heater having three or two input drives such as:
A] electric motor, [main drive]
B] air motor, [standby drive]
C] diesel engine, [standby drive]
In case the application calls for two input drives; electric motor is provided with either air motor or diesel engine as
Standby arrangement.
Speed reducer is having three input shaft as shown in the above picture due to three drives. When the main drive is through electric motor; remaining two drives are getting disengaged automatically through an overrunning clutch provided on their shaft. However in case of power supply failure; drive shall continue rotating, either through air motor or diesel engine drives.
Elecon three stage gear unit having first stage of spiral bevel gearing and remaining two stages of helical gearing. There are three spiral bevel pinions meshing with one wheel. These are nitrided and their tooth contact were fine-tuned by lapping process [by lapping them in pair]. The helical gears/pinions are case hardened and tooth profile ground to accuracy class 6 as per din 3961-63.
Gears and bearings are lubricated through the built on pump. There is a dry well arrangement at output to have foolproof arrangement to avoid oil leakage for vertical shaft orientation. Output shaft bottom bearing is grease lubricated.
Drive details:
-type & size of speed reducer:kdv 225 / so
-main drive power [elec. Motor]:11 kw
-input speed: 1480 rpm
-actual reduction ratio: 110.361/1
-weight: 826 kgs.
