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GEARS :
High quality
alloy case hardening materials provide long life wear resistance
and fatigue strength. Profile ground single helical gears and
spiral bevel gears lapped in pairs ensure high standards of
accuracy, surface finish and quiet running characteristics.
Helical gears are fitted in parallel shaft units whilst units with
shafts at right angles incorporate spiral bevel and helical
gears.
BEARINGS :
Taper Roller bearings are used throughout.
GEAR CASES :
Gear
cases are of rigid cast iron construction with modern styling. MS
Fabricated gear cases are available as optional. Inspection covers
are provided for viewing gear contacts. Oil level dipsticks,
ventilators and drain plugs are fitted. Cases are split in
horizontal plain for horizontal gearboxes and in the vertical
plain for vertical gearboxes.
Gear case
Finish :
Internal and
external semi-gloss blue painted with linear epoxy primer.
External surfaces are finished with alkyde semi-gloss blue paint.
These paints are resistant to dilute acids and alkalis, oils and
solvents, sea water and temperatures up to 1400C.
External
Dimensions :
Centre distances
are chosen from ISO preferred number series. Shaft extensions and
hollow wheel shaft bores are to ISO metric standards. Fasteners are
metric.
Lubrication
: In
horizontal units, lubrication in most instances is by transfer of
oil by gears dipping in the sumps of gear unit bases. Where high
pitch line speeds could cause churning of the lubricant, case
baffles are fitted as indicated on rating tables. Forced
lubrication is necessary where shown and complete systems can be
supplied when required. In vertical units, lubrication in most
instances is provided by a pump driven from the bottom of the high
speed or second motion shaft. The low speed gears dip in the oil
bath. In some cases, it is necessary to use a forced lubrication
system with a separate oil tank. These are marked in the ratings
tables.
All units are provided with combined dipsticks and ventilators and
drain plugs. |
COOLING :
Depending on
the application, standard gear units are cooled by :
Normal heat dissipation by convection from external surfaces. Fans
fitted to high speed shafts.
Cooling water coil fitted in gear unit base.
Fan and cooling coil. Separate oil cooler incorporated in forced
lubrication systems.
SHAFT
MOUNTED UNITS :
Shaft mounted
units are of two designs, the first of which is mounted on the
driven machine shaft extension and connected to the foundation by
torque arm. Additionally foot/shaft design is available for
mounting on a base plate with motor and coupling, the complete
assembly being mounted on the driven machine shaft extension
connected to the foundation by a torque arm.
MOTORISED
GEAR UNITS :
Gear units of
double and triple reduction types are available as standard
assemblies with flanged motors directly mounted on gear case input
shaft housing by adaptors. Motor and gear unit shafts are
connected by flexible coupling.
HOLD BACKS :
Hold
backs can be fitted to all horizontal, two and three stage gear
units, where required to operate in non-reversing drives. They are
located on horizontal pinion shaft and have adequate capacities to
deal with full rated torque. Lubrication is provided automatically
from the oil in the gear unit. Changing the direction of locking
rotation is a simple operation.
PRESERVATION/PROTECTION :
AGNEE helical gear
units are dispatched without oil. Prior to dispatch they are test
run with a rust preventative oil giving adequate protection to
internal parts for a period of 6 months, covering normal transport
and covered storage.
NOTE :
Where
gear units are to operate in abnormal condition or where they are
to stand for long period without running for e.g. in plant
installation, AGNEE must be notified so that suitable protective
arrangements can be made.
As
improvements in design are being made, this specification is not
to be regarded as binding in detail and drawings and capacities
are subject to alterations without notice. Certified drawings
would be sent on request. |
