- Gas Turbines
- Steam Turbines
- Pumps
- Compressors
- ID/FD Fans
- Blowers
Design Standards
- API-613 / 6th edition
- AGMA-6011-J14
- API-677 / 4th edition
- ISO-6336 latest editions
Design:
The gear unit can be constructed with the low-speed shaft offset to the left (arrangement I) or to the right (arrangement II).
Materials:
Grey cast iron is used for the gear unit casing. Pinion and wheel are of case-hardening steel.
Gear cutting:
The single (TAD) and double (T A) helical teeth are case-hardened and ground and modified for the most favourable meshing conditions.
The shafts run in plain bearings, the pinion shaft bearings being adjustable multi-slide bearings.
Lubricating oil system:
Tooth mesh and plain bearings have forced-feed lubrication.
The oil is provided by a gear-type oil pump attached to the wheel shaft or by a separate oil pump unit. As the 'Gjuantity of lubricating oil cannot be absorbed by the casing, a separate oil collecting tank is required. The frictional heat generated in the gear unit is dissipated by an oil filter cooler in the oil circuit, its filter can be disconnected and cleaned during operation.
Direction of rotation:
The input and output shafts rotate in opposite directions. The gear unit can be supplied for either direction of rotation. However, the gearing is run-in only in the direction specified in the order.
Efficiency:
Depending on power, ratio and speed an efficiency of 97.8 to 98.&3% under full load can be achieved.
Extent of supply
The gear unit of standard design is supplied completely assembled. The following instruments are supplied fitted to the gear unit or as separate items: 1 oil circulation indicator with thermometer for each bearing seat, 1 pressure gauge and thermometer each on the oil feed, and 2 measuring cylinders at the gear casing to be used for checking the internal alignment of the gear unit. These items form part of the basic unit. It is recommended that further supervisory elements, such as contact thermometers, flow detectors, thermocouples, etc. be fitted.
Additional items
The following additional items can be supplied: Built-on oil pump, separate oil pump, separate oil pump aggregate, oil filter cooler, turning drives, pinion bearing with double-eccentric adjusting device for correcting alignment, built-in segment thrust bearing, forged-on or fitted coupling flanges at the shaft ends, transmitters for optical or acoustic remote checking, etc. (All devices manufactured to Elecon works standard.) The data correspond to the situation at the time this data sheet was printed.
Alternative gearing arrangements
a) TA
Double-helical gearing
b) TAE
Single-helical gearing
c) TAD
Single-helical with thrust collar gearing
The main feature of these Elecon High-speed gear is that the teeth of the gearing are casehardened and machined to the highest standards of accuracy. The high quality of the gearing, with tooth profile and tooth angle correction, makes it possible to achieve exceptionally high pitchline speeds, even beyond 200 m/s, with power transmissions from a few hundred kilowatts to as high as 150,000 kW.
The Elecon Tax high-speed gears are extremely flexible in their dimensions. Such flexibility is only possible using the most modern design and layout methods and through the flexibility that is possible when using welded gear cases.
Elecon accessories for TA gears
Gas turbine side SSS clutch
TA Turbo Gear Unit
single-stage, with horizontally offset shaft
Double helical Gear units are simple to design & manufacture and compact and are more efficient than single helical gear boxes. The TA TURBO Gear unit is a single stage step-up or reduction Gear unit with horizontally offset designed as a double helical Gear unit based on RENK guidelines. High Gearing quality and tooth flank modification adapted to actual tooth load allow for extremely high pitch line velocity. This Gear unit is used in high speed plants such as turbo generators, turbo Compressor, Boiler feed pump application etc.
The standard design with normal tooth width is intended mainly for medium and high transmission ratios. The standard design »b« with enlarged tooth width is used for medium and small transmission ratios. The gear unit is used in high-speed plants, such as turbo generators, turbo compressors, turbo blowers, boiler feed pumps, etc. and is therefore of a particularly vibration-resistant, sound-damping design.
Selection of suitable gear sizes for Elecon TA gearboxes
Elecon TA high speed gearbox dimensional table
TAD Turbo gear unit
single-stage, with horizontally offset shafts
The TAD turbo gear unit is a single-stage step-up or reduction gear unit with horizontally offset input and output shafts. It is designed as single helical gear unit to the original BBC thrust collar technique. The tooth thrust resulting from the helical teeth is being compensated through the thrust collar, nearly without any loss. Thrust from connected machines acting upon the high-speed pinion shaft can be absorbed, without additional load to the teeth, by means of a thrust bearing located at the low-speed shaft. High gearing quality and tooth flank modification adapted to actual tooth load allow for quiet running and high working safety also in the case of high pitch line velocities.
The standard design with normal tooth width is intended mainly for medium and high transmission ratios. The standard design »b« with enlarged tooth width is used for medium and small transmission ratios.
The gear unit is used in high-speed plants, such as turbo generators, turbo compressors, turbo blowers, boiler feed pumps, etc. and is therefore of a particularly vibration-resistant, sound-damping design.
TAX Turbo gear unit
Dimension and layout of Elecon TAX gearboxes
Guidance values for gear size
The table gives guidance values for the dimensions and arrangement of gears selected with the aid of the initial selection diagram. 
High Speed Gear Units