DESCRIPTION
HANSEN P4 GEAR UNITS
FOR COOLING TOWER DRIVES
B3
The gear unit
Units are designed to comply with the standard CTI specifications.
The mechanical power ratings shown in the tables relate respectively
to input speeds of 1800, 1500, 1200, 1000, 900 and 750 RPM at
the high speed shaft. They are also valid for asynchronous speeds
which are max. 3% lower than the synchronous speeds.
Interpolation will yield power rating values for intermediate speeds.
The power rating for speeds lower than 750 RPM is based on the
continuous torque rating of that speed.
For input speeds exceeding 1800 RPM, please refer to us.
Coding
Type
1 : series Q : Hansen P4
2 : V : vertical low speed shaft
3 : R : right-angle shafts
4 : Size: Z, A, B, ... H
5 : number of stages: 2
5 bis: / : standard gear unit (no code)
L : extended bearing housing (sizes Z, A, B)
X : intermediate size
Shaft arrangement
6 : high speed shaft extension: C: right-angle
7 : low speed shaft extension: U: up
8 : low speed shaft type: N: normal solid shaft
Ratio
9 : nominal ratio
Basic components
Helical and spiral bevel gears
Designed and rated in accordance with AGMA for maximum load
capacity, minimum losses and quiet operation.
All geared components are manufactured from alloy steel, gas
carburized, hardened and precision ground.
Low speed shafts
The low speed shafts are in solid version.
Extended shafts are available upon request.
For all executions, input and output shafts are located in the same
vertical plane.
Bearings
Heavy duty roller bearings of the tapered, cylindrical or spherical
roller type.
Calculated in compliance with ISO and renowned bearing
manufacturers.
The low speed shaft bearings are selected to allow considerable
thrust loads. The nominal permissible thrust load F
xN
mentioned in
the tables, pages B45-B46, is defined for a SFmin = 2, low speed
shaft rotating clockwise and guarantees a calculated bearing life of
100000 hours.
1
Q
2
V
3
R
4 5
2
5 bis
-
6
C
7
U
8
N
-
9
Housings, bearing housings and covers
Made from grey pearlitic cast iron.
Machined on CNC machining centers.
Designed to ensure strength and rigidity.
Unused tapped holes are plugged.
Horizontal split housing.
Systems
Lubrication
Lubricants: mineral oils are normally used. Lubricants should always
contain adequate EP-additives (refer to Service Manual).
Pump lubrication for the upper bearings is standard or optionally avai-
lable.
The gear unit housing acts as a large oil sump
Low speed shafts are provided with a regreasable labyrinth. Grease
nipples, if any, are according to DIN 71412. When using external ser-
vice piping, the nipple can be moved outside the fan stack.
Checking of the oil level is done by means of the gear unit dipstick (al-
ways in the plugged position).
To expedite routine maintenance of wet cooling tower fan drives,
service piping outside the fan stack (not provided by Hansen Industrial
Transmissions nv), is recommended. This piping is arranged so that the
oil can be drained and refilled from outside the stack. The standard
breather and draining plug, fitted in the gear unit on delivery, should
be removed and plugged in outside the stack (away from the direct
stream of moist air).
For ease of maintenance a dipstick outside the fan stack is recom-
mended.
Periodically, the external dipstick should be checked against the gear
unit dipstick.
Cooling
Heat generated in the gear unit due to losses, can be dissipated by:
natural cooling through the housing
additional fan cooling: a shaft driven axial fan can be
incorporated (see page B41)
Free air entry at the suction side should be guaranteed
Thermal checks see page B6
Sealing
Static: Generalized use of sealing compound
Inspection cover on the gear unit: O-ring
Rotary: High speed shaft: depending on gear unit type
Refer to description of each type of gear unit on pages
B39 up to B42
Oil LockTM: - dual purpose labyrinth
- maintenance free
- oil return to sump
Low speed shaft: - dust lip oil seal
- grease purged labyrinth
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